Note: Descriptions are shown in the official language in which they were submitted.
IJll~KLl~l)lJN~ UF i~fl ~NULNIIlJIU
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Tlle invention concerns a roll that i manufactured
from two superpesed webs, one of which is corrugated, Ths
roll is primarily intended For use in so called regenerative
heat exchangers
It is already known to manufacture rolls for
rotating heat-recovery deuices by winding in superpo~ed
relationship one smooth web and one corrugated web of a
metal Poil, usually an aluminium foil, and joining togeth~r
the two webs by means of an adhesive or bonding agent of
composite type, rO wind together the two webs the inner ends
thereof ara secured on a rotatably driven core sleeve, The
smooth web is unreeled from a supply roll onto a spindle
provided with a braking mechanism, The webs thus are wound
into roll form while under soms tension from the smooth web
supply roll, Since the torqu~ axercised by the core sleeve
increases as the diameter oP the winding-on roll increasss9
the adhesiue bond between the smooth web and the ridges of the
corrugated web will brake at a certain degree of tension
in the smooth web on account of the braking force exerted
by the unwinding spindle, and as a result one or several
oF the winding turns of the wsbs will separate from one
another, As a consequence, the entire roll might collapse
whsn it is transPerred to a hardening oven for ~tting of
the adhesive, Although suPficient amounts oP the binding
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agent may remair1 on the ri~ges o~ the corrugated w~b
after breakage of the bond to allnw the ridges to adh0re
to the smooth W8l~, the adhesive on the smooth web at tho
original points of adherence will, howaver, in this casa
be positioned on thg gap bstween th~ ridges with the
consequential disadvantage that tha cross-sectional are~
for air passage through the rotatably driven roll oF the
heat-recouery devices diminishas.
The purpose of the subject invention is to eliminate
the glusing operation completely w~1ile at the same time
provide considerably more efficient e~change of heat than
in heat exchangers fitted with rolls of prior-art types,
SlJMMARY OF TH~ INVENTION
In accordance with the invention are used two
superposed webs of which the first web is provided with
transverse equidistantly spaced ridges whereas the second
wsb is provided with longitudinal ribs, The characteristic
featurs of the invention resides therein that the ridges
of the first web are provided at the ridge tops as well as
at the ridge bases with indentations having a pitch
matching that of the ribs formsd in the second web9 in
which indentations engags said ribs formed in ths second
web,
The invention also concerns a method of manufac-
turing the roll, which method is characterised by the
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ste~)s of lorrnirl~ inden~ations or-l t~e ri~ges in the first
web at the ridge tops as well as at the ridge bases,
said indelltations having a pitch matching that of the
ribs formed in tile second web, and guiding at least
one of the webs so as to ensure that ths ribs are
positioned in said indentations.
The invention likewise comprises a machine for
manufacturing the roll in accordance with the invention,
the machine being characterised in that it comprises
1û first means arranged during the advancement of the
second web to form longitudinal ribs in said web, second
means arranged during the advancement of the first web
to forrn indentations at the ridge tops as well as at ridge
bases of the first webs, said indentations having a pitch
matching that of the ribs, and third means arranged to
control one and/or both webs to ensure that ths ribs of
the second web will. engage on the indentations of the first
web.
ORIEF DESCRIPTION OF THE D~AWINGS
The invention will be described in closer detail
in the following with reference to the accompanying
drawings, wherein
Fig, 1 is a schematic view of a machine in
accordance with the inventiorl, designed to manufacturn rolls
consisting of two superposed and interconnected webs
of material~
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F-igs, 2-4 show in cross-sectional views and on
an enlarged scale three different ~tations of producing
one oF the webs of rnaterial,
FigO 5 is a latsral view of` the station
illustrated in Fig, 4,
Figs, 6 and ~ ara plan views of the roll winding-
-on station, showing one of the end sections of the
latter in different positions,
Fig, 8 illustrates on an enlarged scale a
vertical longitudinal section of the winding-on station
at ths initial stage of the winding-on,
Fig, 9 is a similar view showing a latsr stage of
the winding-on,
Fig, 10 shows on a still larger scale a section
through the outer edge of the rotatably driven end
section of the winding-on station,
Fig, 11 is a perspective view of a portion of the
roll~
Fig, 12 shows on an enlarged scale a cross-sectional
view through a part of the roll,
Fig, 13 is a section along line XIII-XIII in Fig, 12
in the longitudinal direction of the roll, and
Fig, 14 is a partly cut end view of the roll,
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
At each end of an elongate stand 1 are rotatably
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mounted spindl~; 2, S ~ach one holding a supply roll
4 and 5 of smoot~l aluminium foil webs 6 and 79 The stand
also supports a station ~ for imparting corrugations to
the web 6 of matgrial, a station 9 for forming indenta
tions at the tops and bases of ths ridges 10 of the
corrugated wab, and a station 11 to wind the two webs
6 and 7 into a roll 12,
The corrugation station ~ comprises two rotatably
driven cooperating rollers 13, 14 of cog-wheel appearance
between which rollers the web 6 Df material is guided so
that transuerse ridges 10 are formed therein,
Station 9 which is the station in which the
indentations are formed at the tops and bases of the ridges is
positioned after ths corrugation station 8, Station 9
consists of two cog-wheel rollers 15, 16 and two back-up
rollers 17, 18, The latter are provided with peripheral
beads 19 (see Fig, 5) having a shape matching the configur-
ation of notches 20 formed at the tops of the cogs 21 of
the cog-wheel rollers 15, 16, Because of the flow of
material in the press nips formed by the rollers 15, 17
and 16, 18, respectiuely, indentations 22 are formed at
the ridge tops as well as at the ridga bases,
The indentations 22 at ths tops and bases of the
ridges 10 are displaced relative to one another by a
distance corresponding to half a pitch (see Fig, 13),
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thus ensuring that the internal through-flow area remains
constant over the entire length of the channel A thus
formed.
A support plate 23 is arranged after station 9,
on which plate the corrugated web 6 slides freely while
being advanced. The web further travel~ through a pair of
guide or master rollers 24, 25 positioned ahead of the
winding-on station 11. These rollers control the rota-
tional speed of the rollers 13, 14 in relation to the
winding-on speed of the roll 12.
The smooth web 7 is advanced from its supply
roller 5. It travels through a pair of cooperating rollers
26 (similar to rollers 17, 18) which are provided with
peripheral beads to shape ribs 27 in the web 7. The pitch
of the ribs is identical with the pitch of the indentations
22 formed at the tops and bases of the ridges 10. Further,
the web 7 passes a heating device 28, preferably consisting
of two nozzles co~municating with a source of hot air (not
shown). Before reaching the winding-on station 11 the web
7 is guided for lateral alignment by means of an aligner
mechanism 29, whereby is ensured that the ribs 27 of the
web 7 are received in nesting relationship in the inden-
tations 22 and the web 6. Since the web 7 is heated, it
will contract when cooled, thus providing safe and secure
attachment of the two
~,
webs 6, 7 t`orming the roll 12 ~ ons another.
The winding-on station 11 co~lpris~s two coaxial
and rotatably mounted end sections 30, 31, The distance
separating the end sections in the operative position
is approximatsly equal to the width of the webs 6, 7
of material, of which the ribbed web 7 should have a
width which is îractionally (pref`erably by 2 millimeters)
narrower than the width of the corrugated web 6. The
shaft 32 of one of the end sactions 30 is rotatably meuntHd
in a bearing 33 in the stand 1 and is driven via a sprocket
34 at the outer end of the shaft 32. At the end opposite
the sprocket 34 the shaft 32 is shaped as a trunnion 35
on which may be positioned one end of a core sleeve 36
on which ~h~ wsbs 6, 7 of material are to be wound. An
expandable clamping sleeue 3'7 secures the sleave 36 to
the trunnion 35, and a bolt 39 with a head 3B thereon
passes axially through said clamping sleeue 37, the
opposite bolt snd being formed with external threads
cooperating with internal threads formed on tensioning
slseue 4û which is able to -turn in shaft }2 but which is
preuented from performing axial movsments.
rhe opposite end section 31 is by means of its
shaft 41 rotatably mounted in a bearing 42 at tha outer
end of an arm 43, which is arranged to be pivoted outwards
by means of a lever 45 about a vertical shaft 44 provided
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on the stand 1, In the inner position (~igs. 7, ~ and 9)
a pin 46 on the shaft 41 enga9es the free end of the
core sleeve 36 (the left-hand end as seen in Figs, ~ and 9),
On the face f~cing the opposite end section 31,
5 the end section 30 is provided with a round disc 47 of
rubber or similar elastic material which by msans of
screws 4~ or equivalent members is attached along its innsr
and outar edgas to the end section 30 proper. In thc latter
are displaceably mounted a large number of pistons 49
10 each one of which is provided with a head 50 positioned
in a depression 51 formed in the end section internally
of tha round disc 4?. The free ends 52 of the pistons 49
project beyond the rear face 53 of the end section 30.
Upon rotation of the end sections 30, 31 a roller
15 54 rolls in contact with the rear face 53 of the end section
30, said roller 54 being rotatably mounted on a shaft 55
at the lower end of a guide bar 56. The guide bar 56 is
vertically displaceable by means of a guide 57 in a guide
track 5~ formed in column 59 mounted above th~ bearing 33.
20 The guide bar 56 is connected with an arm 60 projecting down
in the gap 61 between the end sections 30, 31 and
at the lower arm end is rotatably mounted a load-exerting
roller 62 positioned approximately level with the pressure
roller 54.
When the arm 43 has been pivoted outwards (Fig, 6)
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and a core sleeve 36 has beell mounted in position with
one end placed on the pin 35 and the expander sleeve 37
clamped thereto, the ends o~ the w~bs 6 and 7 of material
are secured to the core sle~ve with th0 aid o~ an adhesive.
The drive mechanism of the machine is started and the
winding-on of the webs onto the core sleeve 36 begins ~s
a result of the rotation of the latter and of the end
sections 30, 31~ The two webs 6~ 7 are positioned ona
on top of` the ether with the ribs 27 engaging in thu
indentations 22. As one winding turn after tha other is
wound onto tha core sleeve 36, the roller 62 is gradually
lifted, bringing along the arm 6~ and the bar 56 including
the clamping roller 54~ During the rotation of the end
section 30 the pistons 49 move past the roller 54 and in
doing so they are urged inwards by the latter into contact
with the round disc 47 which then projects like a bow
somewhat inwards into the gap 61 betwesn the end sections
30~ 31. This exerts a lateral pressure on tha most recently
formed winding turns of the webs 61 7, whereby thase
winding turns are clamped in position betwsen the end
sections. This means that the pulling f`orce ex~rted by
the shaft 32 is tr~nsf`erred directly to these most recent
winding turns and the tansile stress exerted by the web 7
which is provided with the ribs 27 and which is retained
in a taut condition by the braking mechanism provided on
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the unwinding spindle 3, thus is taken by the friction of
the webs 6, 7 against the end sections 30, 31. The inner-
most winding turns of the webs on the core sleeve 36 thus
are relieved. Consequently, there is no risk of compression
of the winding turns already wound onto the core sleeve.
When the winding of the roller 12 is completed
and the outer winding turn has been fastened with the aid
of an adhesive to the underlying winding turn, the arm 43
is again pivoted outwards and the pressure on the expander
sleeve 37 i9 relieved. The roll 12 together with the core
sleeve 37 may now be removed from the machine. In the sub-
sequent cooling of the roll 12 at room temperature the
above referred to fixation of the webs takes place owing to
the contraction occurring through cooling of the ribbed
web. The fixation of the webs to one another means that
the finished roll cannot collapse.
The ribs 27 and the indentations 22 form through-
flow channels A for the medium flowing through the heat
exchanger of the appearance shown in Figure 13. This con~
figuration results in an enlargement of the heat-
transmission area and also means that the flow through the
channels A will be turbulent and not laminar. In laminar
flows (which would have been the case had the limiting
faces of the channels been completely straight) the layer
of the medium
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flowing closest to the llmiting faces acts as insulation,
preventing the rest of tl~e madium from contacting these
faces~ The turbulent flow generat0d in the channel~ of
the roll in accordance with the invention means that a
larger portion of the flowing medium will come into close
contact with the limiting faces, Thc affect of this
phenomenon and of the enlargemellt of th0 heat~transmission
area of the channels A as a result of the provision of
the ribs 27 make ~or considerably improv~d exchange of heat,
The embodiment as described and illustrated is to
be regarded as an example only and the various parts of
the machine may be constructively altered in a variety of
ways within the scope of the appended claims, For instance,
the roller 54 externally of the end section 30 may be replaced
by a slip shoe supported by the bar 56, Also the opposite
end section 31 may be fittsd with a round disc 47 of an
elastic material, The slip shoe may have a length and/or
width to ensure that it depresses two or several pistons
49 at the same time, There are also other ways of relieving
the innermost winding turns~ An arrangement including the
use of pneumatically operated pistons which transfer the
pulling force to ths outermost winding turn is likewise
possible,
