Note: Descriptions are shown in the official language in which they were submitted.
Filter press
The present invention relates to a filter press, and
more particularly, to an improvement of filter plates for
a filter press.
Filter plates used for filter presses having various
structures are known in the art.~
A known structure is shown in one of the accompanying
drawings, in which: ~
Fig. 1 is a schematic side elevational view showing
the fundamental operation of a filter press accordlng to
a first embodiment of the present invention, '
Fig. 2 is a front view showing the relationship
between a filter plate and a filter cloth of a filter
press according~to the firs~t~embodiment~
Fiq. 3 is a partially sectional view showing a
plurality of filter plates disposed in a~ filter press
according to the Eirst~embodlment~,~
Fig. 4 is a schematic,sectional view of the filter
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, " ' :. '' ' '~ ~ :
~5;~i3
-- 2 --
cloth shown in Fig. 2,
Fig. 5 is a side view showing three filter plates
according to the first embodiment in which two filter
plates located at the right side are closed and one
filter plate at the left side is opened,
Figs. 6 and 7 are, respectively, a front view and
sectioned side elevational view showing the relationship
between a filter plate and a filter cloth according to a
modification of the first embodiment,
Fig. 8 is a schematic side elevational view of a
filter cloth according to a second modification of the
first embodiment,
Fig. 9 is a front view of the second modification
showing the relationship between a filter plate and a
filter cloth,
Fig. 10 is a side elevational view of filter plates
and filter frames according to the second modification
which are closed,
Fig. 11 is a side view of a filter press of a third
~0 modification of the first embodiment,
Fig. 12 is a schematic sectional view of an essential
portion of a filter press according to a second embodiment
of the present invention,
Fig. 13 is a view viewed in the direction of a line
XIII-XIII in which the filter cloth is partially cut away,
Fig. 14 (I) is a front view of members for maintaining
the space between filter cloths and vibrating filter
cloths,
Fig. 14 (II) is a sectional view of the member taken
along a line A - A in Fig. 14 (I),
Fig. 14 (III) is a sectional view of tha member taken
along a line B - B in FigO 14 (I),
Fig. 15 is a front view of a first modification of the
second embodiment in which a filter plate provided with a
pressing diaphragm is covered with a filter cloth,
Fig. 16 is a sectional view of filter plates and
filter cloths according to the first modification shown
in Fig. 15,
Fig. 17 (I) is a front view of a member for maintain-
ing space between filter cloths and vibrating Eilter cloths
according to a modifiction of the second embodiment,
Fig. 17 (II) is a sectional view of the member Eor
maintaining space between filter cloths and vibrating
cloths shown in Fig. 17 (I),
Figs. 18 and 19 are, respectively, front views showing
a member for maintaining space between filter cloths and
vibrating cloths according to another modification,
Fig. 20 is a schematic sectional view showing the
essential portion of a filter press according to another
modification of the second embodiment,
Fig. 21 is a front view showing a framej a member
or maintaining space between filter cloths and vibrating
cloths, and a raw liquid feed plate shown in Fig. 20,
Fig. 22 is a cross-sectional view of the member for
maintaining space between filter cloths and vibrating
filter cloths shown in Fig. 21,
Fig. 23 is a sectional view showing another modifica-
tion of the member for maintaining space between filter
cloths and vibrating filter cloths,
Fig. 24 is a top plan showing a further modification
of the member for maintaining space between filter cloths
1~ and vibrating filter cloths,
Fig. 25 is a sectional view of the modification taken
along a line XXV - XXV in Fig. 24,
Fig. 26 is a partially broken front view in which a
filter plate of a third embodiment of the present inven-
tion is covered with a filter cloth,
Figs. 27 and 28 are a side elevational view and a
sectional side elevational view of the two filter plates
shown in Fig. 26,
Fig. 29 is a front view of a filtrate collecting
~0 member provided with a space maintaining member shown
in Fig. ~6,
Fig. 30 is a sectional si~de elevational view of
filtrate collecting member shown in Fig. 29,
Fig. 31 is a front view of a filter cloth on which
a filtrate collecting member according to a modification
of the third embodiment i.s mounted,
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-- 5 --
Fi~. 32 is a sectional side elevational view of the
filter plate on which the filtrate collecting member and
the filter cloth show in Fig. 31,
Fig. 33 is a front view in which a space maintaining
member of another modification of the third embodiment is
mounted on a filtrate collecting member,
Fig. 34 is a sectional side elevational view taken
along a line XXXIV - XXXIV in Fig. 33, and
Fig. 35 is a sectional side elevational view of a
conventional filter plate.
Fig. 35 is one of the known filter plate structures in
which a filtrate drainage guide member 60b or a filtrate
floor, for receiving a filtrate passing through a filter
cloth and subsequently guiding it downwards, is formed in
integration with a rectagular frame 60a, and many recesses
60c, ..., 60c are formed on both faces of the filtrate
drainage guide member 60b, whereby the filtrate which has
passed through the filter cloth flows down smoothly.
According to the above-described structure, however,
the filtrate drainage guide member is integrally fixed
to the frame, and further, these members are all~rigid
bodies, so that when a large difference in pressure arises
between one face and the other face of each filter plate
during a filtration operation, the filtrate drainaye guide
member is liable to deform against the frame; which may
lead to a breakage of the filtrate drainage guide member.
.' `. . ., !:" ' '
-- 6 --
It is an object of the present invention to provide a
~ilter press in which a filtrate drainage guide member is
prevented from being broken when pressure applied to one
face of a filter plate is much different from that applied
to the other face.
According to the invention there is provided a filter
press having a plurality of filter plates; a plurality of
pairs of filter cloths each pair being disposed between
the neighboring plates; clamping means for clamping the
filter plates in the direction in which the plates are
arranged, wherein after a plurality of filter plates are
clamped and a raw liquid is introduced between each pair
of the filter cloths so as to filter the raw liquid and
the filtrate passes through the filter cloths and flows
downward along the filter plate, and filter residue is
maintained between each pair of the filter cloths, char-
acterizing in that each of the filter plates has: a frame
forming a closed loop; a flat filtrate drainage guide
means; and supporting means for movably supporting said
~0 filtrate drainage guide means in said frame.
Accordingly, in general terms, the invention provides
a filter press which is so constructed that the frame is
formed separately from the filtrate drainage guide member.
The advantages obtained by this construction are
as follows: Firstly, the above~described construction
permits the filtrate drainage guide means to move in the
.. . ....
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,
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~2~ 3
frame independently or in unison with a filter cloth
even if the pressure applied to one face of the drainage
guide means is much different from the pressure applied
to the other face, thereby eliminating the possibility
S of a breakage of the filtrate drainage guide means.
Furthermore, the construction facilitates a replace-
ment of the filtrate drainage means within the frame.
Still further, the replacement of a filtrate drainage
guide means with a filtrate drainage guide means of a
1~ different thickness can vary the dimension of the filter
chamber formed between the filtrate drainage guide means,
a filter plate and the filtrate drainage guide means, and
a neighboring filter plate depending on the property of
the raw liquid which is to be filtered, thus facilitating
an adjustment of the percentage of water contained in a
filter residue. Still further, the configuration and
width provided with a filtrate drainage guide means can be
varied by replacing the filtrate drainage guide means with
a filtrate drainage guide means of a different configura-
2~ tion and width depending on the property of a raw liquid
which is to be filtered. Still further, the material
which is used for the frame can be different:from that
which is used for the filtrate drainage guide means,
so that a highly rigid material can be selec~ed for the
frame, while the material for the filtrate drainage guide
means can be most appropriately selected for the raw
liquid which is to be Eiltered. Still further, light
filter plates can be provided and accordingly the energy
which is generated by a filter plate-driving unit can be
reduced by using a material lighter than that which is
used for the frame. Still further, since ~he frame and
filtrate drainage guide means can be separated, it is easy
to carry the filter plates, and the filter press can be
repaired by replacing only the filtrate drainage guide
means if the filtrate drainage guide means becomes broken
while the filter press is being assembled or a raw liquid
is being filtered. Compared with this construction, since
in a conventional plate in which a frame body is integra-
ted with a filtrate guide means, the replacement work is
troublesome; that is, when a filtrate drainage guide means
or a frame is broken, it is necessary to replace an entire
ilter plate instead of replacing ~ust the broken part.
Furthermore, the filtrate drainage guide means can be
independently vibrated because the filtrate drainage guide
means is separately provided, and since the vibration of
~0 the iltrate drainage guide means causes vibration of the
filter cloth, ~ilter residue may be prevented from clogg-
ing the ilter cloth.
A detailed description of the present invention is
given in the following with reference to Figs~ 1 to 34
~5 of the accompanying drawings.
In the drawings, Figs. 1 though 11 show the first
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embodiment of the present invention. Figs. 12 through 25
show the second embodiment, and Figs. 26 through 34 show
the third embodiment.
A filter press according to the present invention com-
prises, as shown in Figs. 1 and 2, side beams 12 and 12
provided between a front stand 30 and a rear stand 31; many
Eilter plates 2, ..., 2 disposed between the front and rear
stands 30 and 31 in such a way that the filter plates are
slidably hung by the side beams 12 and 12 in the longitudi-
nal direction thereof. Each of the filter plates comprises
a frame 1 which forms a closed loop; flat filtrate drainage
guide means 3, movably disposed in the frame 1; and support-
ing means 5, for movably supporting the filtrate drainage
guide means 3, in the frame 1. A pair of filter cloths 5
and 5 are disposed between neighboring filter plates. A
movable plate 36 is disposed between the rear stand 31 and
the filter plate 2 positioned nearest the rear stand 31.
The movable plate 36 is advanced toward the front stand
30 by a driving unit 29 on the rear stand 31 so that the
2~ filter plates 2, ..., 2 may be clamped to each other.
Thereafter, a raw liquid is introduced, with pressure
applied, into a filter chamber 13 for filtration. Then,
the filtrate flows down through the filter cloth along
the filter plate and filter residue is held between the
pair of Eilter cloths 5 and 5. After the filtration is
complete, the movable plate 36 is moved back so as to
space the filter plates 2, ..., 2 from each other.
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-- 10 --
In the first embodiment, the supporting ~eans is composedof the filter cloths 5 and 5d per se. Further~ as shown in
Figs. 2 and 3, the pair of filter cloths 5 and 5 are inter-
posed between the neighboring filter plates 2 and 2. Each of
the filter plates 2 is approximately square and the periphery
of the filter plate 2 is provided with the square frame 1.
The ~rame 1 is provided with a filtrate drainage guide mem-
ber 3 as the above-described filtrate drainage guide means
therein separately formed. The filter cloth 5 is used as
1~ the supporting means.
The frame 1 of the filter plate 2 is composed of a metal,
a synthetic resin or woodl and forms a closed rectangular
loop and is provided with ears lb at both sides of the upper
and lower portions thereof. Each ear lb has a filtrate col-
lecting hole la which passes therethrough and a communicatingpassage lc which connects the filtrate collecting hole la to
the surface of the filtrate drainage guide member 3. The
frame 1 is provided with gripping hands 4 at both sides
thereof at the middle in the vertical direction, and a
curved protrusion ld is formed at the middle of the upper
portion thereof. A sliding of the gripping hands 4 on a
side beam 12 moves the filter~plate 2 along the side beam 12.
The lower end portions of a pair of arms 7 and 7 are pivo-
tally connected to the respective gripping hands 4 at the
end faces thereof by hinges 11. The upper portions of an
arm 7 is pivotally connected by hinges 8 to the upper portion
of an arm 7 pivotally connected to the gripping hand 4 of a
.. . , . - .... ~ ,, ,', ...
.. ' .. ....
,
.. . . , ,, ' ..
~2~23
neighboring filter plate 2, thereby the space, between
a pair of filter cloths 5 and S sandwiched between the
filter plates 2 and 2, are spaced when the filter plates
are spaced from each other and a filter residue 14 held
between the filter cloths 5 and 5 can drop out.
The filtrate drainage guide member 3 of the filter
plate ~ is composed of metal such as aluminum, iron, syn-
thetic resin such as polypropylene, nylon, polystyrene or
wood. The member 3 is a square plate which has a thickness
of l to 5/l of that of the frame l. The contour of the
member 3 is almost equal to that of the frame l. There
may be a slight clearance between the outer periphery of
the member 3 and that of the frame l. The member 3 is
provided with many filter passa~es through holes 3b, ....
lS 3b and a protrusion ld at the upper portion provided with
a raw liquid feed hole 3a which penetrated therethrough.
The construction of the filter cloths 5 and 5 are
known in the art; that is, as shown in Fig. 4, the filters
S and S are provided with raw liquid feed holes 5a and 5a
at the respective upper portions thereof. The periphery
oE the raw liquid feed holes 5a and 5a are sewn with the
periphery of the cylindrical raw liquid feed communicating
pieces 5b made of the same material as the filter cloth 5.
Attached to the respective upper portions of the filter
cloth 5 are pockets 5c and 5c which are formed by sewing
the folded upper portions thereof. A filter cloth-hanging
;2~3
- 12 -
bar h is inserted through the pockets 5c and 5c. The
respective cloth filter hanging bars 6 are hung so as to
swing around pins 9, through springs 10 and 10 serving as
a means for vibrating filter cloths, whose both ends are
penetrated into the respective upper portions of the pair
of the arms 7 and 7. The cylindrical communicating pieces
5b of the filter cloth S is penetrated into the raw liquid
feed hole 3a of the filtrate drainage guide member 3 so as
to use the cylindrical communication pieces 5b as a con-
necting member, whereby the filtrate drainage guide member
3 is supported by being hung from the filter cloth 5 and
is parallel to the filter cloth 5. The lower portion of
the eiltrate drainage guide member 3 is, as shown in Fig.
5, fixed by setscrews 15 and 15 detachably inserted into
the lower portion of the frame L so ~hat the lower portion
of the member 3 may not be swayed perpendicularly to the
surface of the frame 1.
In the press filter having the above-described con-
struction, the respective filter plates 2 are assembled
~0 as follo~s. One of the pair of filter cloths 5 and 5 is
first rounded so as to penetrate it through the raw liquid
feed hole 3a of the filtrate drainage guide member 3r and
thereafter, it is unfolded so that both faces of the fil-
trate drair.ge guide member 3 are covered with the filter
cloths 5 and 5 and the cylindrical communication piece 5b
oE the eilter cloth 5 is positioned inside the raw liquid
Eeed hole 3a oE the Eiltrate drainage ~uide member 3.
. ' .
_~3~ 3
Thereafter, the filtrate drainage guide member 3 is hung by
the filter cloths 5 and 5. Next, the frame 1 is supported
by hanging it from side beam 12 by means of the respective
gripping hand 4, and then, one of the filter cloths 5 is
penetrated through the frame 1. Thereafter, the filtrate
drainage guide member 3 supported by hanging from the filter
cloths 5 and S is fitted in the frame 1. Next, the lower
poxtion of the filtrate drainage guide member 3 is fixed to
the frame 1 by the pins 15 and 15 so that the member 3 is
not shaken against the frame 1. The respective filter cloth
hanging bar 6 is inserted into the respective pockets 5c of
the respective filter cloth 5, and then, both ends of the
respective filter cloth hanging bars 6 are supported by
hanging it from the arms 7 and 7 through the springs 10 and
lS 10, with the result that the filter plate 2, in which the
filtrate drainage guide member 3 is integrated with the
frame 1, is assembled. Many filter plates thus formed are
disposed inside the filter press. Thereafter, when the
driving unit 29 is driven so that the movable plate 36 is
~0 advanced, and a pair of filter plates 2 and 2 at the right
side in Fig. 5 are clamped to each other, a raw liquid is
introduced from the respective raw llquid feed holes 3a into
the filter chamber 13 formed ~between the pair of filter
cloths 5 and 5 so as to filter the raw liquid in the filter
chamber 13. The peripheral portions of the filter cloths 5
and 5 are sandwiched between the adjacent frames I and 1 and
. . . ~
- 14 ~ 2~3
the filtrate drainage guide member 3 is connected to and
supported by the filter cloths 5 and 5 located at the front
and rear faces of the frame 1 through the cylindrical
communicating piece 5b. Therefore, even if the filtrate
guide member 3 is forced to move to one direction by the
pressure of the raw liquid, the movement of the filtrate
guide member 3 can be limited by the filter cloth 5. Thus,
the movement of the filtrate drainage guide member 3 is very
slight if any, so that the raw liquid is reliably filtered
between the pair of the filter cloths 5 and 5 located
between the neighboring filtrate drainage guide members 3
and 3~ When the movable plate 36 is moved back by the
driving unit 29 so as to unclamp the filter plates 2 as
shown in Fig. 5 in which two filter plates 2 and 2 at the
right side are spaced, the pair of arms 7 and 7 disposed at
both sides of the frame 1 are opened so as to space the pair
of cloths 5 and 5, so that the filter residue 14 sandwiched
between the filter cloths 5 and 5 are dropped. When a
preparation work for a filtration is made, only the filtrate
~0 drainage guide member 3 is disassembled from the frame 1 and
the filter cloths 5 and 5 as necessary, with the frame 1
supported by the side beams 12 and 12, so as to replace the
disassembled filtrate drainage guide member 3 with a desired
filtrate drainage guide member 3.
In the first embodiment, when the dimension of the
filter chamber 13, formed between the filtrate drainage
..
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1s ~ 2~3
guide members 3 mounted on the filter plates 2 and 2 which
are adjacent to each other, is changed depending on the
property of a liquid which is to be filtered, the setscrew
15 and 15 are taken out of the frame 1 with the frame 1
secured to the filter press, and then, the filtrate drainage
guide member 3 is disassembled from the frame 1, and
subsequently the other filtrate drainage guide member 3,
different in its thickness from that of the disassembled
filtrate drainage guide member 3, is fitted in the frame
body 1, and then, it is secured to the frame 1 by the
~setscrews 15 and 15, thereby the dimension of the filter
chamber 13 being easily changed. Hence, a filtrate drainage
guide member 3 is easily replaced. When it is desired to
change the configuration or width of a filtrate flow passage
lS groove; i.e., holes, 3b, ..., 3b depending on the property
of a filtrate, a filtrate drainage guide member 3 having a
different configuration or width in its filtrate flow
passage groove is fitted in the frame 1, and then, the
~iltrate drainage guide member 3 is attached to the frame 1
~0 by the setscrews 15 and 15. The material for the frame 1
ma~ be different from that of the filtrate drainage guide
member 3, e.g., a highly rigid material can be used for the
frame 1 and a material most suitable for the filtrate
drainage guide member 3 can be selected depending on the
~5 property of a raw liquid. When the filtrate drainage guide
member 3 is formed using a material lighter than that for
- 16 - ~ 3
the frame 1, the filter plates are light as a whole, in
which case, the driving power for driving the filter plates
2 can be reduced. Further, the filtrate drainage guide
member 3 can be disassembled from the frame 1, so that it is
easy to transport the filter plates 2. Furthermore, if the
~iltrate drainage guide member 3 is broken, a repair work
can be done by replacing only the broken filtrate drainage
guide member 3. Since the filtrate drainage guide member 3
is supported by the pair of filter cloths 5 and 5 forward
1~ and backward of the filtrate drainage guide member 3, it is
difficult for the filtrate drainage guide member 3 to move
in the direction perpendicular to the frame 1 even if a
great force is applied to one of both faces of the filtrate
drainage guide member 3, so that a raw liquid can be
reliably filtered by the pair of the filter cloths 5 and 5
disposed between the filtrate drainage guide members 3 and
3. The filtrate drainage guide member 3 is not directly
suppoxted by the frame 1, therefore, it is unnecessary to
mount a member for supporting the filtrate drainage guide 3
~a member on the frame 1 and the same filtrate drainage guide 3
member can be used by fitting it in the frame 1. Thus, the
~iltrate drainage guide means 3 can be utilized for various
frame bodies.
The construction of an apparatus according to the
present invention is not limited to the above-described
first embodiment, but embodied in various manners. For
- 17 - ~Z~2~
example, as shown in Figs. 6 and 7, the filter cloth-hanging
bar 6 may be mounted on both ends of the upper portion of
the frame 1 of the filter plate 2 instead of being mounted
on the gripping hands 4. In detail, position adjusting bars
22 are protruded on both ends of the upper portion of the
frame 1 and the filter cloth-hanging bars 6 are secured to
the position adjusting bars 22 through the filter
cloth-hanging bar fixing member 20, and a spring 21, serving
as a vibrating means, is mounted between the filter cloth
hanging fixing member 20 and the top ends of the frame 1.
As shown in Figs. 8, 9, and 10, cloths Se and 5e are
sewn with the corresponding filter cloths 27 and 27 at
positions which confront wlth each other and a connecting
member 5d such as a string and a~narrow wire is connected to
lS the cloths 5e so as to connect the cloths Se and 5e. The
frame 1 is provided with a raw liquid feed hole 3a at a
corner thereof and a rectangular connecting-member inserting
hole 3c is so mounted on the filtrate drainage guide member
3 as to penetrate thereinto and~ the connecting members 5d
~0 and 5d are inserted into the connecting-member inserting
hole 3c so that the connecting members 5d ~and Sd are tied
and the filtrate drainage guide member 3 is hung from the
filter cloths ~27 and 27. A filter press of duplex type is
constructed by disposing alternately the duplex filter plate
2 and a conventional filter plate 25. Numeral 23 in Fig. 9
shows a stopper for ad~justlng the force of the spring 21.
- 18 - ~ 3
The configurations of the filtrate drainage guide
member 3 and the frame 1 are selected as desired for example
as circular configurations. The filtrate drainage guide
member 3 may be so constructed that it has a through hole 3b
or a convex-concave groove or honeycomb configuration. In
order to prevent the filtrate drainage guide member 3 from
being shaken against the frame 1, the filtrate drainage
guide member 3 may be fitted in the frame 1. When pressure
applied to filter plates is as high as 2 to 15 kg/cm2 during
a filtration, tappets may be inserted between neighboring
filtrate drainage guide members 3 and 3, in which case, the
tappets about with each other, so that the filtrate drainage
guide member is cannot be easily dislodged out of the frame
1. The cylindrical communicating piece 5b or the filter
connecting member 5d may be penetrated into the through hole
3b formed in the filtrate drainage guide member 3 so as to
hang the filtrate drainage guide member 3 from the filter
cloth 5. The filtrate drainage guide member 3 may be
provided with protrusions which are connected to the
~0 connecting member 5d so that the filtrate drainage guide
member 3 can be hung from the filter cloths 5 and 5.
In the foregoing description, the filtrate drainage
guide member 3 is supported ~by the frame 1 through the
filter cloth 5 and the filter cloth-hanging bar ~, however,
~5 the filtrate drainage guide member 3 may be supported by a
supporting member for supporting filter cloth-llal-ging member
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1 9 ~ ^3
33 movably supported on a rail 32 mounted on an upper
portion between the front and rear stands 30 and 31. More
specifically, the filter cloth-hanging bar 6 is supported by
a spring 35 so as to swing the bar 6 around the spring 35
mounted on the supporting member 33 at the lower end
thereof, whexeby the member 33 for supporting filter
cl~th-hanging bar is moved along the rail 32 through a
r~ller 34 in unison with a movement of the frame 1 along the
side beam 12. Thus, the filter plates 2 can move close to
or apart from each other.
~ filter press according to embodiment comprises the
filtrate drainage guide means serving, as a member for
maintaining spaces between filter cloths as well as
vibrating filter cloths, and filter cloths 40A and 40B
lS serving as a supporting means. As shown in Figs. 12 and 13,
the filter plate 2 of the filter press comprises the square
frame l from which sheet-shaped filter cloths 40A and 40B
are hung at the front and rear faces of the filter press; a
member 41, for maintaining space between filter cloths as
~0 well as vibrating filter cloths, which is to be inserted
into the frame 1 and supported by the filter cloths 40A and
40B; and the filter cloth 40 which serves as a means for
supporting the member 41 in the frame 1.
The filter cloth 40 is large enough to cover any of the
front or rear face of the frame 1 and has a raw liquid feed
hole 40a provided at the center hereof. The raw liquid feed
- 20 ~ 5~ ~
hole 40a is located at approximately the center o~ a space
le which is surrounded by the frame body 1. The filter
cloths 40A and 40B hung from the frame at the front and rear
faces thereof are connected to each other by sewing the
circumference of the raw liquid feed openings 40a and 40a
which confront each other. The member 41, for maintaining
space between filter cloths as well as vibrating filter
cloths is fixed to the raw liquid feed hole-connecting
portion 40b fitting the member 41 over the member 40b formed
by sewing as above. The outer peripheries of the filter
cloths 40A and 40B hung from the frame 1 which confront each
other are sandwiched by the neighboring frames 1 and 1 and
brou~ht into close contact when the filter plates 2 and 2
are clamped, in which case, the filter chamber 13 is formed.
Since the construction of the frame 1 mounted on the
filter plate 2 is approximately the same as the frame 1 of
the first embodiment, the description of the same
construction is omitted by designating like parts by like
reference numerals and only the construc~ions different from
~0 the first embodiment are described herebelow. A spring
supporting portion 8a is protrudingly formed, in the width
direction of the filter press, from a hinge 8 mounted on an
upper portion of each arm 7 of the frame 1 to connect the
upper portion of the spring supporting portion 10. A filter
cloth hanging plate 42 is connected to the spring supporting
portion 8a disposed at a lower portion thereof. The filter
cloth hanging plate 42 has a pair of small holes and with
which the ends of the filter cloth han~ing bars 6 of the
respective filter cloths 40 are engaged. The filter cloths
40A and 40B at the front and rear faces of the neighboring
frames are hung by means of the different by hanging bars 6
and 6 which are neighboring hanging plate 42.
As shown in Fig. 14 (I) through (III), the member 41,
for maintaining space between filter cloths as well as
vibrating filter cloths mounted on the filter plate 2 is
1~ composed of an approximately circular thin plate in which an
inner circular portion 41a and an outer portion 41b are
integrally formed by connecting members 41c, ..., 41c. The
line which passes through the midpoints of the confronting
portions S2 described later is at a right angle with the
line which passes through the midpoints of the other
confronting portions S2. Many ribs 41d, ..., 41d are formed
on the surface of the member 41. The hole 4le at the center
o~ the inner circular portion 41a is so formed that its
diameter is approximately the same as that of a raw liquid
feed hole 40a of the filter cloths 40A and 40B, and the
inner circular portion 41a thus formed is fitted over the
portion 40b for connecting the raw liquid feed hole. More
particularly, one of the filter cloths 40A and 40B is
rounded, and then, inserted into a hole 41e of the inner
circular portion 41a. Thereafter, the member 41 is fitted
over the connecting portion 40b located between the filter
~,'''' ' ' , '
&3
cloths 40A and 40B so as to hang the filter cloths 40A and
40B as described above, thereby supporting the member 41,
for maintaining space between filter cloths as well as
vibrating filter cloths, at approximately the center of the
S space le of the frame 1. As a result of supporting the
member 41 on the filter cloths 40A and 40B, a space Sl is
formed between the inner face of the frame 1 and the outer
face of the outer circular portion 41b and space S2 is
formed between the outer circular portion 4lb and the inner
circular portion 41a, in which case, the spaces S1 and S2
form the flow-out portion of filtrate, with the result that
the member 41, for maintaining space between filter cloths
as well as vibrating filter cloths supported in the frame 1
does not damage filtrate-drainage performance.
The filter plate 2, comprising the frame 1 and the
member 41 for maintaining space between filter cloths as
well as vibrating filter cloths, and the filter cloths 40 is
disposed in the space le in the frame 1 as shown in Fig. 12;
that is, the frame 1 is movably disposed between the front
~0 stand 30 and the movable plate 36. Next, a pair of filter
cloths 40A an 40B are supported by means of the pair of arms
7, 7; 7, 7 through the spring 10 and 10, the filter cloth
hanging plates 42 and 42, and the filter cloth-hanging bar
6. Then, the member 41, for maintaining space between
filter cloths as well as vibrating filter cloths is fitted
over the connecting portion 40b for connecting the raw
- 23 -
52~.3
liquid feed hole of the filter cloths 40A and 40B located at
the front and rear faces of the frame 1. In Fig. 12,
numeral 31a designates a pipe, for introducing raw liquid
under pressure into the filter chambers 13 through the raw
liquid feed hole 4Oa.
According to the above-described construction, the
movable plate 36 is moved toward the front stand 30 so as to
clamp the filter plates 2, ..., 2 at a position near the
front stand 30 (rear to Fig. 1). A raw liquid feed pump
1~ (not shown) is connected to the raw liquid introducing pipe
31a to feed a raw liquid under pressure to the respective
filter chamber 13, and thereafter, the raw liquid under high
pressure is introduced into the respective chamber 13
through the raw liquid feed hole 40a. As a result, the
filter cloths, which are respectively sandwiched by the
neighbouring frame 1, approach each other, however, the
space therebetween is maintained by the member 41 for
maintaining space between filter cloths as well as vibrating
filter cloths interposed between the filter cloths 40A and
40B~ By virtue of this construction, the filtrate flows out
of the filter chamber 13 and passes through the filter
cloths 40A and 40B to the spaces S1 and S2 in the frame 1,
and thereafter, flows down to the lower portion of the frame
1, and then flows through a communicating hole lc into a
filtrate collecting hole la. The filter residue 14 remains
between the pair of cloths 40 and 40.
~'~.'
'` ~ '
: '
- 24 -
After a raw liquid is filtered, the movable plate 36 is
moved back to space the filter plates 2, ..., 2, resulting
that the filter residue 14 dropps through an outlet of the
lower portions of the filter chamber 13. At this time,
since the filter cloths 40A and 40B are supported by the
spxings 10, the filter cloths 40A and 40B are easily
vibrated when the filter plates are away from each other and
the filter cloths 40A and 40B which are vibrating in contact
with the member 41, so that the filter residue 14 which has
1~ adhered to the mesh of the filter cloths 40 is dropped.
Following advantages are obtained according to the
above described second embodiment. The frame 1 is simple in
its construction, namely, approximately square, so that a
light filter press can be constructed and manufacturing cost
is low. Since the space between the filter cloths 40A and
40B is maintained by the member 41 for maintaining space
between filter cloths as well as vibrating filter cloths, a
contact of the filter cloths 40A and 40B can be prevented.
Since the member 41 is supported by hanging from the filter
2~ cloths 40A and 40B, the filter resldue 14 which has been
clogged in the mesh of the filter cloth 40 can be dropped
owing to a contact of the filter cloth 40 with the member
41, caused by a vibration of the filter cIoth 40, thus
clogging of the filter residue in the filter cloth 40 can be
~5 prevented. The member 41 for maintaining space between
filter cloths as weIl as vibrating filter cloths 40A and 40B
2~3
can be easily directly mounted on the member 40b for
connecting the raw li.quid feed hole mounted on the filter
cloth 40. Therefore, it is easy to assemble a filter press
and the assembly of the filter press requires few number of
parts. Furthermore, owing to the provision of the member
41, the filtering performance of the filter cloths 40A and
40B are more preferable than the filtering per~ormance
obtained by the provision of a member for maintaining space
between filter cloths.
1~ The second embodiment is not limited to the
above-described construction. For example, the second
embodiment can be preferably applied to a filter plate of
compressing type. As shown in Figs. 15 and 16, the pressing
diaphragms 43, composed of an elastic material such as
lS rubber, on which many irregularities are formed, is piled on
the inner side of the filter cloths 40A and 40B which
sandwich the frame l and the respective upper, and lower
ends of a pair of the diaphragms 43 mounted at the front and
rear sides of the frame 1 are easily fixed by bolts 44, ....
44; 44, ..., 44. The respective raw liquid feed hole 43a of
a pair of the diaphragms 43 and 43 are connected to each
other, and the member 41 for maintaining space between
filter cloths as well as vibrating filter cloths 40A and 40B
is fitted over the connecting portions to support the raw
liquid feed holes 43a~. In F1g. 15, numeral lf designates a
fluid flow hole formed at the~ear lb mounted on the frame 1,
.
,, ~,, .
- 26 ~ 3
whereby fluid which expands the compressing diaphragms 43 is
introduced, with pressure applied, between the confronting
compressing diaphragms 43 and 43 through a cornmunicating
hole lg. Filtrate take-out holes 43b and 43b, formed in the
diaphragm 43, connect the surface of the diaphragm to a
communicating hole lc. Numeral lh indicating a cleaning
fluid-flowing hole formed at the ear lb disposed at the
upper portion of the frame body 1 communicates the
communicating hole li formed on the frame 1 to the
communicating hole 43c formed in the diaphragm 43. After a
raw liquid is filtered, cleaning fluid is ejected to the
diaphragm surface and the underside of the filter cloths 40A
and 40B through the fluid-flow hole lh and a communicating
hole li, an d43c. In the above-described embodiment, the
member 41 for maintaining space between filter cloths as
well as vibratlng diaphragms 43 and 43, so that the
diaphragms never contact with each other and compressing
fluid is easily supplied. Further, the ~ilter residue 14 is
compressed by tlle compressing dia~hragm 43 through the
~0 filter cloth 40, and the compressing diaphragm 43 serves as
a means for vibrating the filter cloth 40 when the filter
plates are spaced for filtrate drainage.
The member 41 for maintaining space between cloths as
well as vibrating filter cloths 40A and 40B may be mounted
~5 between the filter clo=hs 40A ard 40B~ and the ~ompressing
: ~
,,, -- : - - :
~ '
-
- 27 ~ ~2~ 3
diaphragm 43 so that the member 91 may act directly on the
filter cloth 40.
As shown in Fig. 17 (I) and (II), many protrusions 41f
provided on the both surfaces of the member 41 form a fluid
guiding groove which guides the filtrate to flow. Further,
the protrusions 41f can act as a rib, which reinforces the
member 41. In addition, clogging of filter residue can be
prevented owing to vibration, transmitted from the filter
cloth 40, caused by the contact of the protrusion 41f with
the filter cloth 40. Figs. 18 and 19 show modifications of
the member 41. The member 41 shown in Fig~ 18 is so
constructed that the outer periphery of a supporting plate
41g in horse-shoe shape is connected to outer plates 41h,
~lh, and 41h by elastic pins 41i, ..., 41i. In the member
41 shown in Fig. 19, the outer periphery of a circular plate
41j is connected to outer plates 41k, 41k, and 41k by pins
41i, ..., 41i. The above-descxibed members 41 can impart a
tapping vibration to the filter cloth 40 at the back side
thereof.
~0 As a modification of the member 41, the member 41 may
be mounted on a filter cloth through a raw liquld feed plate
instead of hanging it from the fiIter cloths 40A and 40B.
More specifically, as shown in Figs. 20 and 21, the frame 1
is covered with a large filter sheet 48 so as to hang
filtering portions, namely, fllter cloths 48a and 4~a from
the frame 1 at the front and rear faces thereof and a raw
28 ~ 2~3
liquid feed plate 49 is mounted on a raw liquid feed hole
48b and the member 41 is mounted on the raw liquid feed hole
48b of the filter plate 49.
Through holes lk, lk, lm, lm are mounted on the ears
lb, ... lb disposed at the upper and lower portions of the
frame
1. The respective through holes lm provided at the lower
portion of the frame 1 is communicated to one end of a
con~unicating hole ln provided at the lower portion thereof
1~ and the other end of the communicating hole ln is
communicated to a lower corner of a space le surrounded by
the frame 1 so as to form a hole for ejecting cleaning
liquid as well as releasing liquid and respective upper
through holes lk are communicated to an end of an upper
communicating hole 11 and the other end of the con~unicating
hole 11 is communicated to an upper corner of the space le
of the frame 1 so as to form a hole for ejecting cleaning
liquid as well as releasing liquid.
~s shown in Fig. 20, the filter cloth sheet 48, which
~a is long in the lateral direction thereof has raw liquid feed
holes 48b and 48b at approximately the center of the filter
cloths 48a and 48 a hanging from both faces of the frame l.
The filter cloth 48 is hung from the frame 1 in such a
manner that the top end face 48c of the filter sheet 48
~5 strides over the upper face lo of the frame 1 and covers the
outer perlphery of the f ame 1 and the raw liquid feed holes
. . .
'~~` 29 ~ 2~S~3
48b and 48b are positioned at approximately the center of
the,space le in the frame body 1.
As shown in Figs. 21 and 22, the member 41 comprises a
portion 411 for maintaining space between filters which is
composed of a rectangular thick frame, and a pair of thin
spring-like diaphragms 4lm and 4lm whose both ends are
connected to the middle of the upper and lower portions of
t~le portion 411 so that the diaphragms 41m and 41m pass
through the centers of the spaces surrounded by the portion
1~ ~11. The members 41 are inserted into the filter cloths 48a
and 48a positioned at the front and rear faces of the frame
1 and disposed in parallel with the filter cloths 48a. The
confronting ends of the diaphragms 41m and 41m are disposed
at the inner side of the raw liquid feed holes 48b and 48b
and circular raw liquid feed plates 49 and 49 are brought
into contact with the outer1side of the raw liquid feed
holes 48b and 48b. The raw liquid feed plates 49, the
rilter cloths 48a, and the diaphragm 48m are clamped by
setscrews 50, ..., 50. Thus, the member 41 is fixed to the
~ilter cloths 48a and 48a through the raw liquid feed plates
49 and 49 so as to be assembled to the frame 1.
In a filter press in which many filter plates 2 having
such a construction as described above are assembled, a raw
liquid under high pressure is filled in the respective
filtering chamber 13 through the holes 49a of the respective
raw liquid feed plates 49 wher, the raw liquid is fed to the
,
- 30 -
~LZ~ 3
raw liquid introducing tube 30a by the raw liquid feed pump
(not shown). As a result, the filter cloths 48a and 98a
sandwiching the frame 1 approach each other in the frame 1.
However, space between the filter cloths 48a an~ 48a is
m~intained by the space maintaining element 411 of the
membex 41 disposed at the
center of the space le in the frame 1. According to this
construction, raw liquid flows from the filtering chamber 13
through the filter cloths 48a and 48a disposed at both sides
of the frame body 1, and flows into the space S3 formed
between the inner periphery of the frame 1 and the outer
periphery of the member 41 and the space S4 formed between
tha filter space-maintaining member 411 and the raw liquid
feed plate 49, and then, flows into the filtrate releasing
~loles ln and ln which are opened at corners of the lower
portion of the inner periphery of the frame 1 and collected
~y the through holes 1M and lm provided at the lower portion
o~ the frame 1.
After a filtration is completed, the frame 1 is moved
so as to widen the space between frame 1 and 1, and
thereafter, filter residue lS released. Since the diaphragm
41m of the member 41 is composed of a resilient thin plate,
the diaphragm 41m easily vibrates when the frame 1 is moved
or the filter residue 1 is removed from the filter cloths
~5 48a and 48a with the result that the filter cloths 48a and
48a located at both sides of the frame 1 are vibrated and
'
.. ,'',
; ~,
.
- 31 ~ 2~3
the filter cloths 48a and ~8a a~ut the member 41, which
causes the filter residue 14 which has stayed in the mesh of
the filter cloths 48a and 48a to fall. Filter cloths are
cleaned by introducing cleaning liquid into either a through
hole disposed at an upper portion or at a lower portion and
also to the space between the filter cloths 48a and 48a.
The following advantages are obtained according to the
above-described modified construction. A filter press is
light and manufacturing cost is low because the
configuration of the frame is simple, namely, substantially
rectangular. Since the space between the filter cloths 48a
is maintained by the member 41, contact of the filter cloths
48a can be reliably prevented. Further, as the member 41 is
provided with the flat spring 41m, the member 41m is easily
1~ vibrated. The filter residue 14 which has stayed in the
mesh of the filter cloth 48a can be removed by vibrating the
filter cloth 48a and bringing the member 41 into contact
with the filter cloth 48a, thereby the residue 14 being
prevented from being clogged in the mesh in the filter cloth
~a 4~a. Moreover, the member 41, which is inserted between the
filter cloths 48a and 48a, and the raw liquid plates 49 and
49 can be integrated, thus facilitating an assembly work.
Another modification is shown in Fig. 23, i.e., the
cross section of outer frame of the member 41 may be so
2~ formed that the cross section thereof is triangle. The
member 41 may be made of synthetic resin. As when in Flgs.
. " . . . . .
~2~ 3
24 and 25, the raw liquid feed hole connecting portion 41n
is U-shaped. Diaphragms 41p are respectively connected to
the outer periphery of the raw liquid feed hole connecting
portion 41n by means of the corresponding arms 41p so as to
flow raw liquid downwards preferably. Further, a
sufficiently wide space
between neighboring filter cloths 48a and 48a can be
provided by the raw liquid feed hole connecting portion 41n.
Furthermore, the filter cloths 48a and 48a may be vibrated
owing to the vibration caused by the diaphragms 410, ....
410.
In the second embodiment, the raw liquid feed holes
40a, 48b provided at the filter cloths 40 and 48a are
respectively, located at substantially the center of the
framel. However the holes 40a, 48b can be also applied to a
filter press of top feed type (refer to Fig. 2) in which a
raw liquid feed hole is formed at an upper portion of the
frame 1 as well as a filter press of a bottom feed type in
which a raw liquid feed hole is formed at a lower portion of
2~ the frame 1. The method for supporting the filter cloths ~0
and 48a by hanging them from the frame 1 is not limited to
the above-described methods. The filter cloths 40 and 48a
may be supported by a member other than the frame 1 as shown
in Fig. 11. The frame 1 may be formed in any desired
configuration such as circular, polygon or the like.
-
- 33 -
~2~52~3
In a filter press in the third embodiment, the filtrate
drainage guide means serves as a filtrate collecting member
and a filter cloth 53 movably supported in the frame body 1
acts as the supporting means. More specifically, a filter
plate 2 of a filter press in the third embodiment 3 is, as
shown in Figs. 26, 2~, and 28, provided with a frame 1, a
~iltrate collecting member 52 disposed in the frame l, and
filter cloths 53 and 53, serving as the supporting means, so
disposed at both faces of the frame 1 as to surround a
l~ space le in the frame 1 in the direction perpendicular to
the front and back thereof. During a filtration, a pair of
filter cloths 53 and 53 are sandwiched between the
neighboring frames 1 and 1, and raw liquid under pressure is
introduced into the filtering chamber 13 between the filter
lS cloths 53 and 53 so as to filter the raw liquid, and
thereafter, a cake is maintained in the filtrating chamber
13 located between the filter cloths 53 and 53. Filtrate is
stored in the space le in the respective frame l through
~ilter cloths 53, and thereafter, the collected filtrate is
2a allowed to flow through filtrate collecting member 52 to the
lower portion of the frame l so as to be collected.
The configuration of the above-described frame 1 is
pentagon in its horizontal section and vertical section as
shown in Fig. 28. The frame 1 has inclined inner faces lp,
lp inclining from the middle toward both sides in the
direction perpendicular to the front and back of the frame
- '
'' ' -, : ' .
_ 34 _ ~2~ 3
body 1. Ears lb and lb are formed at each lower portior, of
the side faces of the frame 1, and a filtrate co~lecting
hole la, which penetrates in the direction perpendicular to
the ears lb and lb, is formed at the ears lb and lb. A
communicating hole lc which communicates the space le,
formed inside the frame 1 to the filtrate collecting hole
la r is formed at each corner at the lower portion of the
fxame 1.
The filter cloths 53 are disposed at both sides of the
frame 1 so as to sandwich the space le formed inside the
framel. The upper and lower portions of a pair of the
filter cloths 53 and 53 are clamped by means of bolts 54 to
be supported by the frame 1. Each filter cloths 53 has a
circular raw liquid feed hole 53 located at a position
corresponding the center of the frame 1. l'he periphery of
the raw liquid feed hole 53a of the filter cloths 53 and 53
are sewn with each other.
As shown in Fig. 29, the filtrate collecting member 52
made of cloth is disposed in the space le inside the frame
~a 1. The front and rear faces of the member 52 are covered
with the filter cloths 53 and 53, respectively. A through
hole 52a which communicates the raw liquid feed hole 53
formed on the filter cloth 53 is formed at the center of the
filtrate collecting member 52. The periphery edge of the
through hole 52a is sewn with the periphery end of the raw
liquid feed hole 53a and the filtrate collecting member 52
_ 35 ~ 2~3
is hung by the filter cloth 53 so as to move the raw liquid
collecting member 52 freely together with the filter cloth
53. It is to be noted that a sewing of the filtrate
collecting member 52 with the filter cloth 53 differentiates
5 the dimension of the mesh of the filter cloth 53 at the
portion where it is sewn, from the dimension of the mesh of
other portions, in which case, filtering efficiency is
reduced, however, such efficiency reduction can be avoided
by sewing the raw li~uid feed hole 53a of the filter cloth
ith the through hole 52a of the raw liquid collecting
member 52 as described above. Such a sewing does not make
the dimension of the mesh uniforrn throughout the filter
cloth 53, and filtering efficiency is not reduced. It is
~referable that a hard material is used for the filtrate
collecting member 52. The member 52 can be positioned
vertically in the frame 1 by supporting the periphery edge
of the through hole 52a without supporting the upper portion
oE the member 52~ Material for the filtrate collecting
member 52 can be selected from light natural material,
synthetic resin, metal and the like. The member 52 can be
so formed as to have mesh when~ synthetic resin or metal is
used as the material therefor. The configuration of the raw
liguid collecting member 52 shown in the drawings is square
in the front view, however, the configuration of the member
52 is arbitrary, e.g., circular or triangle. A certain
space is-formed between the outer perlphery edge of the
filtrate collecting member 52 and the inner face lp of the
frame 1.
As shown in Fiqs. 29 and 30, the raw liquid collecting
element 52 is provided with a space maintaining member 55
above the through hole 52a so as to maintain a certain space
between the filter cloths 53 and 53, which allows filtrate
to be introduced to the frame 1 easily. The convex 55b of
one division element 55a is inserted through a hole 52b of
the filtrate collecting member 52 and fitted in a hole 55d
1~ of the other element 55c. Thus, the space maintaining
member 55 is mounted on the filtrate collecting member 52.
A filtration according to the above-described
construction is as follows: Many filter plates 2, ..., 2
positioned between the front stand 30 and the rear stand 31
(refer to Fig. 1) are supported by the side beams 12 and 12
provided, between both stands 30 and 31, at both sides of
the filter press so that the filter plates 2, ..., 2 can be
moved forward and backward. The movable plate 36 is
advanced to clamp filter plates 2, ..., 2 at a place where
~0 the front stand 30 stops. Thereafter, raw liquid under
pressure is introduced
from the raw liquid feed hole 53a, formed on the filter
cloth 53 disposed between the filter plates, to the filter
chamber 13 formed between a pair of the confronting filter
cloths 53 and 53 so as to separate the filter residue 14
from filtrate after filtering the raw liquid by the filter
- 37 -
i2~
cloths 53. The filter residue 1~ is maintained in the
filter chamber 13 located between a pair of filter cloths 53
and 53, while the filtrate passes through the filter cloths
53 into the frame l. Thereafter, the filtrate collecting
member 52 guides the filtrate downward in the frame 1, and
then, the filtrate flows through the communicating hole lc
into the filtrate collecting hole la so as to be collected.
As described in the third embodiment, a filtrate
drainage guide member is not formed in the frame 1 of the
~ilter plate, but a cloth which serves as a filtrate
collecting member 52 is supported by hanging from the filter
cloth 53~ Therefore, a filter press according to this
embodiment can be lighter than a conventional one in which a
filtrate drainage guide member is provided. Further, since
the filtrate collecting member 52 is supported in the frame
between the filter cloths 53 and 53, filtrate which has
passed through the filter cloth 53 into the frame 1 can be
reliably collected by allowing the filtrate to flow through
the filtrate collecting member 52 to the lower portion of
?O the frame l, hence the filtrate being smoothly collected.
In addition, the filtrate collecting member 52 is so
supported that the filter cloth 53 can move in unison with
the member 52. l'herefore, if there arises a big filtration
pressure difference between both sides of the filtrate
collecting member 52, the filtration pressure difference can
be absorbed by mo~ing the member 52, so that~the member 52
. .
52~i3
is not damaged. Meanwhile it is to be noted that in a
conventional filter plate in which a filtrate drainage guide
member is provided, if a big filtration pressure difference
is generated, the filtrate drainage guide member is damaged
because the filtrate drainage guide member is rigid. In
a~dition to the above advantage of the invention, since the
filtrate collecting member 52 made of a cloth undergoes an
elastic deformation, which can absorb a filtration pressure
difference.
The third embodiment is not limited to the
above-described construction, but many modifications are
possible. For example, the thickness of the filtrate
collacting member 52 may be selected as desired. 'rhe
configuration of the member 52 is not restricted to the one,
shown in Fig. 26, in which a certain space is provided
batween the inner face lp of the frame 1 and the periphery
adge of the filtrate collecting member 52. The member 52
which is so wide as to reach the inner face lp of the frame
1 as shown in Fig. 31 and the one which is so great as to
~0 sp~ead be~ond the inner face lp of the frame body 1 may be
also used. The member 52 can be constructed using more than
two sheets as shown ln Fig.~32 which is a cross-sectional
view of the embodiment shown in Fig. 31. The~provision of a
plurality of the member 52 allows an easy generation of
clearance between the confronting filter cloths in the space
le in the frame 1, so that filtrate can be collected more
- 39 -
easily. The member 52 may be mounted on the filter cloth 53
at desired points such as shown in Fig. 31, wherein the
member 52 is sewn at four corners of the filter cloth 53.
The member 52 may be mounted on the filter cloth 53 by
5 sewing the member 52 with a cloth sewn on the filter cloth
53~ The member 52 in which an elastic material is used can
correct a filtration pressure difference which is generated
between both faces of the member 52. Even a solid body used
as the material for the member 52 can correct a pressure
difference generated between both sides of the member 52 if
the solid body is movably mounted on the filter cloth 53 or
the frame l. A sheet having no mesh to allow filtrate to
pass therethrough can be used as a material for the member
52.
The space maintaining member 55 may not be provided
depending on quality of material, property of a raw liquid,
and the like. The member 55 may be formed in an arbitrary
configuration and the number of members can be selected and
positioned as desired. As shown in Figs. 33 and 34, the
~0 member 55 may be mounted on the filtrate collecting member
52 by means of bolts 57, ..., 57 after a pair of circular
plates 56e and 56e are disposed at the clrcumference of the
through hole 52a of the filtrate collecting member 52. The
plates 56e comprise C-shaped plates 56c and 56d. A raw
liquid feed concave portion 56b and an abutting convex
portion 56a are alternately formed on the surface of the
- 40 ~ 3
plates 56c and 56d. ~hen many frame 1, ..., 1 are clamped
by a movable plate at a position near one of the two stands.
The convex portions 56a of t~e space maintaining member 56
are brought into contact with each other and the pair of
S concave portions 56b and 56b confront each other so as to
form a space, so that a raw liquid is fed from the space
into the filter chamber 13.
As shown in Fig. 20, the frame 1 may be covered with a
large filter cloth 53 so as to cover the front and rear
1~ faces of the frame 1. The filter cloth 53 may be supported
by hanging it from members (refer to Fig. 11) other than the
frame 1. The place where the raw liquid feed hole 53a
provided on the filter cloth is disposed is not limited to a
filtering face in the frame, but it may be a so-called top
feed type or bottom feed type in which a raw liquid feed
hole is disposed outside a filtering face.
The configuration of the frame 1 is not limited to a
square, but also circular or any shape as desired.
In the above-described embodiments and modifications, a
filter cloth is used as a supporting means, however, it is
possible to use other supporting means such as an elastic
string so as to movably support a filtrate drainage guide
means in the frame 1. In the embodiments and their
modifications, li~e parts are designated by the like
~5 numerals for the sake of brevity.
.
- 41 ~ 3
All of the embodiments and their modifications
described above can fully attain the object of the
invention.
.~ ~
