Note: Descriptions are shown in the official language in which they were submitted.
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WATER SUPPLY/DRAINAGE PUMP
Background
[0001]
The present invention relates to an engine-driven water
supply/drainage pump configured to supply/drain water, and more
particularly, to a water supply/drainage pump having a function
to damp engine noise.
[0002]
Hitherto, there have been known water supply/drainage
pumps configured to be driven by an internal combustion engine.
The water supply/drainage pumps are used in various fields such
as agriculture and civil engineering, more specifically,
irrigation, drainage, water pumping, and the like.
[0003]
In recent years, in consideration of influence of noise
of the engine on a surrounding environment, the possibility of
providing a soundproof water supply/drainage pump including a
soundproof cover configured to cover the engine and a pump such
that leakage of the noise of the engine to an outside is prevented
as much as possible has been investigated.
However, when the engine and the pump are covered with
the soundproof cover in this way, sufficient ventilation is
difficult to perform. As a result, the engine cannot be
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sufficiently cooled. In contrast, in order to obtain
sufficient cooling performance, a large ventilation hole needs
to be formed through the soundproof cover. As a result, noise
damping performance is degraded.
[0004]
In order to solve such problems, development of an
engine-driven water supply/drainage pump having both a cooling
function and a noise damping function has been demanded.
[0005]
Under such circumstances, as a water supply/drainage pump
having both the cooling function and the noise damping function,
the inventor of the present application has been proposed a
soundproof engine pump disclosed in Japanese Patent Application
Laid-open No. 2001-152847.
Summary
[0007]
In the soundproof engine pump disclosed in Japanese
Patent Application Laid-open No. 2001-152847, an engine section
and a pump section are housed in the casing. The engine section
and the pump section are mounted integrally to each other. An
exhaust pipe and a muffler are connected to each other in the
casing, and exhaust gas is discharged to an outside of the casing
through the exhaust pipe. Further, the exhaust pipe and the
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muffler are covered with a cooling jacket incorporated in the
casing.
In addition, cooling conduits of the cooling jacket are
assembled around the exhaust pipe and the muffler, and the
cooling conduits are connected to a drain conduit of the pump.
[0008]
In the soundproof engine pump configured as described
above, a piping system of an entirety of the pump is complicated.
As a result, assembly of the entirety of the pump is troublesome.
Further, in order to protect the exhaust pipe, the muffler,
the cooling jacket, and other components at the time of using
the pump, the entirety of the pump is covered with the casing.
In this way, there has been a problem in that the pump is
inevitably increased in size.
[0009]
The present invention has been made to solve the
related-art problems as described above, and has an object to
provide a water supply/drainage pump in which a piping system
including an exhaust pipe can be simplified, which facilitates
assembly, and which has both a cooling function and a noise
damping function.
Further, the present invention also has an object to
provide a water supply/drainage pump that contributes to
downsizing of the water supply/drainage itself.
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[0010]
In order to solve the related-art problems as described
above, and to achieve the objects, according to an embodiment
of the present invention, there is provided a water
supply/drainage pump, including:
an engine section;
a pump section configured to supply/drain water by being
driven by the engine section; and
a heat exchanger block mounted to a body of the pump
section between the engine section and the pump section,
the heat exchanger block including
an exhaust passage connected to an exhaust port for
the engine section, and
a cooling passage formed along the exhaust passage
and being continuous with a water supply/drainage passage
formed in the body of the pump section.
[0011]
With this configuration, a piping system of an entirety
of the water supply/drainage pump is simplified, and hence the
water supply/drainage pump can be easily assembled.
[0012]
It is preferred that, in the water supply/drainage pump
according to the embodiment of the present invention, the heat
exchanger block further include a muffler passage continuous
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with the exhaust passage.
With this configuration, effect of damping noise of
exhaust gas can be increased.
[0013]
It is preferred that the water supply/drainage pump
according to the embodiment of the present invention further
include a volute chamber formed between the body of the pump
section and the heat exchanger block,
the heat exchanger block further including:
a water inlet configured to allow water in the water
supply/drainage passage to be caused to flow into the cooling
passage via the volute chamber; and
a water outlet configured to allow the water in the
cooling passage to be drained into the water supply/drainage
passage.
With this configuration, arrangement of the cooling
passage can be facilitated.
[0014]
It is preferred that, in the water supply/drainage pump
according to the embodiment of the present invention, the engine
section include a pump drive shaft,
the pump drive shaft having a front end to be inserted
into the volute chamber through the heat exchanger block, and
including a water supply/drainage impeller mounted to the front
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end.
Also with this configuration, the arrangement of the
cooling passage can be facilitated.
[0015]
It is preferred that, in the water supply/drainage pump
according to the embodiment of the present invention, the
exhaust passage include a radiating fin.
With this configuration, effect of radiating heat of the
exhaust gas can be increased.
[0016]
It is preferred that, in the water supply/drainage pump
according to the embodiment of the present invention, the heat
exchanger block be made of die-cast aluminum.
Also with this configuration, the effect of radiating the
heat of the exhaust gas can be increased.
[0017]
It is preferred that, the water supply/drainage pump
according to the embodiment of the present invention further
include a casing configured to cover the engine section and the
heat exchanger block and including a partition plate,
the engine section and the heat exchanger block being
located on an inside of the casing with respect to the partition
plate of the casing,
the pump section being located on an outside of the casing
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with respect to the partition plate.
With this configuration, operating noise of the engine
section, noise generated by the heat exchanger block, and other
noises can be restrained from leaking to the outside.
Further, the heat exchanger block is mounted to the body
of the pump section between the engine section and the pump
section. Thus, an inlet and outlets of the body of the pump
section are not covered with the casing. With this, hoses can
be easily connected to/disconnected from the inlet and the
outlets of the pump section.
[0018]
It is preferred that, the water supply/drainage pump
according to the embodiment of the present invention further
include a sealing member that has a vibration damping function
and a noise damping function, and is fitted to a joint part
between the partition plate and the heat exchanger block.
With this configuration, noise leakage from the joint
part between the partition plate and the heat exchanger block
can be prevented. In addition, vibration of the entirety of
the water supply/drainage pump and vibration of the casing
during operation of the pump section can be alleviated.
[0019]
It is preferred that, in the water supply/drainage pump
according to the embodiment of the present invention, the casing
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be provided with an exhaust port configured to allow air on the
inside of the casing to be discharged to the outside of the
casing.
With this configuration, gases such as the exhaust gas
that is discharged from the engine section and stagnates in the
casing can be discharged to the outside.
[0020]
It is preferred that, in the water supply/drainage pump
according to the embodiment of the present invention, the pump
section include:
an opening portion formed through a front portion of the
pump section and communicating to an inside of the pump section;
and
a freely openable/closable lid member mounted to the
opening portion.
With this configuration, even without removing the casing,
the inside of the pump section can be easily cleaned.
[0021]
According to the embodiment of the present invention, it
is possible to provide a downsized water supply/drainage pump
in which the piping system including the exhaust passage can
be simplified, which facilitates assembly of the water
supply/drainage pump, and which has both the cooling function
and the noise damping function.
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Brief Description of Drawings
[0022]
FIG. 1 is an external perspective view of a water
supply/drainage pump according to an embodiment of the present
invention;
FIG. 2 is a partially cutaway side view of an internal
structure of the water supply/drainage pump;
FIG. 3 is an exploded perspective view of the internal
structure of the water supply/drainage pump;
FIG. 4 is a partially cutaway side view of an internal
structure of a pump section;
FIG. 5 is a front view of the internal structure of the
pump section;
FIG. 6 is a front view of a heat exchanger block as viewed
from the pump section side;
FIG. 7 is a perspective view of the heat exchanger block
as viewed from the pump section side;
FIG. 8 is a rear view of the heat exchanger block as viewed
from an engine section side;
FIG. 9 is an exploded perspective view of the heat
exchanger block as viewed from the engine section side;
FIG. 10 is an enlarged sectional view of a part of the
heat exchanger block which part includes an exhaust chamber;
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FIGS. 11 are views of a part of the heat exchanger block
which part includes an exhaust passage; FIG. 11(a) is a
perspective view; and FIG. 11(b) is an enlarged perspective
view;
FIG. 12 is a rear view of a part of the heat exchanger
block which part includes a muffler passage;
FIG. 13 is a perspective view of a part of the heat
exchanger block which part includes a second chamber;
FIG. 14 is an enlarged perspective view of a part of the
second chamber of the heat exchanger block which part includes
a first water inlet;
FIG. 15 is a front view of a cooling passage of the heat
exchanger block as viewed from the pump section side;
FIG. 16 is a rear view of the exhaust passage of the heat
exchanger block as viewed from the engine section side;
FIG. 17 is an exploded perspective view of the water
supply/drainage pump; and
FIG. 18 is a front view illustrating a state in which a
partition plate of a casing of the water supply/drainage pump
is removed.
Detailed Description of Embodiments
[0023]
Now, a water supply/drainage pump 1 according to an
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embodiment of the present invention is described.
FIG. 1 is an external perspective view of the water
supply/drainage pump 1. FIG. 2 is a partially cutaway side view
for illustrating an internal structure of the water
supply/drainage pump 1. FIG. 3 is an exploded perspective view
for illustrating the internal structure of the water
supply/drainage pump 1. FIG. 4 is a partially cutaway side view
for illustrating how water is supplied to/drained from an inside
of a pump section 3. FIG. 5 is a front view for illustrating
how the water is supplied to/drained from the inside of the pump
section 3.
[0024]
(Overall Structure of Water Supply/Drainage Pump)
As illustrated in FIG. 1 to FIG. 5, the water
supply/drainage pump 1 includes an engine section 2, the pump
section 3 configured to supply/drain the water by being driven
by the engine section 2, and a heat exchanger block 4 arranged
between the engine section 2 and the pump section 3 and
configured to cool exhaust gas from the engine section 2. The
engine section 2 and the heat exchanger block 4 are covered with
a box-shaped casing 6.
[0025]
(Engine Section)
The engine section 2 is an air-cooled internal combustion
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engine. A pump drive shaft 10 is mounted integrally to a drive
shaft (not shown). A front end 10a of the pump drive shaft 10
is inserted into a volute chamber 7 of the pump section 3 through
the heat exchanger block 4. An impeller 12 is mounted to the
front end 10a. Further, a cooling fan (not shown) of the engine
section 2 is mounted to a rear end of the pump drive shaft 10
of the engine section 2.
In the casing 6, a fuel tank 5 is mounted above a body
2A of the engine section 2.
[0026]
(Pump Section)
The pump section 3 includes a body 3a made of die-cast
aluminum, an inlet 3A opened on an upper side of a front portion
of the body 3a, and outlets 3B and 3B coaxially opened on an
upper side of both right and left side portions of the body 3a.
The volute chamber 7 is formed between the body 3a of the
pump section 3 and the heat exchanger block 4. The volute
chamber 7 communicates to a first chamber 8 that serves as a
water supply/drainage passage. A front side of the heat
exchanger block 4 is provided with a second chamber 9
communicating to the volute chamber 7.
The inlet 3A communicates to the first chamber 8, and the
first chamber 8 communicates to the volute chamber 7. The
outlets 3B and 3B communicate to the second chamber 9.
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A central part of the second chamber 9 is provided with
a shaft hole 4A configured to allow the front end 10a of the
pump drive shaft 10 to be inserted therethrough. The front end
10a of the pump drive shaft 10 is inserted into the second chamber
9 through the shaft hole 4A. In addition, the impeller 12
arranged in the volute chamber 7 is mounted to the front end
10a.
[0027]
When the impeller 12 in the volute chamber 7 is rotated,
as indicated by the arrows in FIG. 4, the water is taken into
the first chamber 8 through the inlet 3A. As indicated by the
arrows in FIG. 4, the water in the first chamber 8 is caused
to flow into the second chamber 9 through the volute chamber
7. Then, as indicated by the arrow in FIG. 4, the water in the
second chamber 9 is drained to an outside through the outlets
3B and 3B.
Specifically, in a case of supplying/draining water for
irrigation channels, first, the pump drive shaft 10 of the
engine section 2 is driven so as to rotate the impeller 12 in
the volute chamber 7. With this, pressure is generated by the
rotation of the impeller 12, and the water is taken into the
first chamber 8 through the inlet 3A. The water taken into the
first chamber 8 is caused to flow into the second chamber 9.
Then, the water caused to flow into the second chamber 9 is
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drained to the outside through the outlets 3B and 3B.
[0028]
A lower side of the front portion of the pump section 3
is provided with an opening portion 3C communicating to the
volute chamber 7. A freely openable/closable lid member 3D is
mounted with screws 3E to the opening portion 3C. Thus, by
operations of opening/closing the lid member 3D, an inside of
the volute chamber 7 can be easily cleaned.
[0029]
(Heat Exchanger Block)
Next, with reference to FIG. 6 to FIG. 12, a structure
of the heat exchanger block 4 is described in detail.
FIG. 6 is a front view for illustrating the second chamber
9 of the heat exchanger block 4. FIG. 7 is a perspective view
for illustrating a cooling passage 13 of the heat exchanger
block 4. FIG. 8 is a rear view for illustrating an exhaust
passage 18 of the heat exchanger block 4. FIG. 9 is an exploded
perspective view for illustrating the exhaust passage 18 and
a muffler passage 21 of the heat exchanger block 4. FIG. 10
is an enlarged sectional view for illustrating an exhaust
chamber 18A of the heat exchanger block 4. FIGS. 11 are views
of a part of the heat exchanger block 4 which part includes the
exhaust passage 18; FIG. 11(a) is a perspective view; and FIG.
11(b) is an enlarged perspective view. FIG. 12 is a rear view
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for illustrating the muffler passage 21.
[0030]
The heat exchanger block 4 is made of die-cast aluminum
excellent in heat radiation efficiency.
As illustrated in FIG. 6, in the heat exchanger block 4,
specifically, on a side of a front surface portion that is
mounted to the body 3a of the pump section 3, the cooling passage
13 having a circular-arc shape is formed in a manner of
surrounding a part corresponding to substantially half of a
circumference of the second chamber 9.
The heat exchanger block 4 is mounted to the body 3a of
the pump section 3 through intermediation of a first sealing
plate 11 (refer to FIG. 3) . Note that, the heat exchanger block
4 mounted to the body 3a of the pump section 3 is freely removable.
Thus, in case where foreign matter such as dust clogs on the
way in the cooling passage 13 described below, and needs to be
removed, or when the heat exchanger block 4 needs to be
overhauled, such work can be easily carried out.
The cooling passage 13 is sealed and waterproofed by the
first sealing plate 11.
[0031]
A lower side of a back wall of the second chamber 9 is
provided with a first water inlet 14A formed so as to communicate
to the cooling passage 13. The water in the second chamber 9
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is caused to flow into the cooling passage 13 through the first
water inlet 14A.
An upper side of the back wall of the second chamber 9
is provided with a first water outlet 15A. An upper side of
the cooling passage 13 is provided with a cooling chamber 13A.
The cooling chamber 13A is provided with a chamber connection
port 13B. The chamber connection port 13B and the first water
outlet 15A communicate to each other.
[0032]
The water caused to flow into the cooling passage 13 is
returned to the second chamber 9 through the cooling chamber
13A, the chamber connection port 13B, and the first water outlet
15A. Note that, the back wall of the second chamber 9 is also
provided with a second water inlet 14B and a third water inlet
14C that communicate to the cooling passage 13.
Specifically, by driving and rotating the impeller 12
arranged in the volute chamber 7, the water taken into the first
chamber 8 is caused to flow sequentially through the second
chamber 9, the cooling passage 13, and the second chamber 9.
[0033]
With such a configuration, the water supplied/drained by
the pump section 3 can be used as coolant for the cooling passage
13. Thus, temperature of the coolant to be caused to flow into
the cooling passage 13 can be maintained at appropriate
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temperature. In this way, performance of cooling the exhaust
passage 18 described below can be enhanced.
[0034]
The rear of the heat exchanger block 4 is mounted to the
body 2A of the engine section 2 through intermediation of a base
plate 16 and a second sealing plate 17 (refer to FIG. 3) . Behind
the heat exchanger block 4, specifically, behind the cooling
passage 13, a circular-arc exhaust passage 18 is formed along
the cooling passage 13.
An upper portion of the exhaust passage 18 is provided
with the exhaust chamber 18A having a dome shape. The base plate
16 is provided with a first exhaust port 19 configured to guide
the exhaust gas, which is discharged from the engine section
2, into the exhaust passage 18. Behind the exhaust chamber 18A,
the cooling chamber 13A being a part of the cooling passage 13
is formed in accordance with a size of the exhaust chamber 18A.
[0035]
As indicated by the arrows in FIG. 10, the exhaust gas
discharged through the first exhaust port 19 is once received
by the exhaust chamber 18A, and then dispersed. Then, the
exhaust gas is caused to flow into the muffler passage 21 through
the exhaust passage 18, and then discharged to the outside
through a second exhaust port 25.
[0036]
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As described above, by forming the exhaust chamber 18A
configured to dissipate heat of the exhaust gas in the exhaust
passage 18, and by forming the cooling chamber 13A along the
exhaust chamber 18A, a large surface area of cooling the exhaust
gas can be secured. With this, development of hot spots can
be prevented.
[0037]
In the exhaust passage 18, a plurality of radiating fins
20 are formed in a stepped pattern at a predetermined interval
along a direction of discharging the exhaust gas. By virtue
of the radiating fins 20, exhaust pressure can be adjusted, and
exhaust temperature can be adjusted to appropriate temperature.
In addition, the exhaust gas is discharged to a lower side of
the exhaust passage 18 through clearances 20A formed between
the radiating fins 20.
[0038]
The rear of the heat exchanger block 4 is also provided
with the muffler passage 21 continuous with the exhaust passage
18. A lower portion of the exhaust passage 18 is provided with
a first exhaust-gas connection port 22 communicating to the
muffler passage 21. Through the first exhaust-gas connection
port 22, the exhaust gas in the exhaust passage 18 is discharged
into the muffler passage 21.
[0039]
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The muffler passage 21 is partitioned into a plurality
of muffler chambers 23. The muffler chambers are located in the
the direction of discharging the exhaust gas. A bottom wall
of each of the muffler chambers 23 is provided with a second
exhaust-gas connection port 24 communicating to adjacent ones
of the muffler chambers 23 above and below.
By partitioning the muffler passage 21 into the plurality
of muffler chambers 23, a silencing effect can be enhanced.
An upper portion of the muffler passage 21 is provided
with the second exhaust port 25 configured to allow the exhaust
gas in the muffler passage 21 to be discharged into the casing
6.
The exhaust passage 18 is sealed by the second sealing
plate 17 such that the exhaust gas does not leak from the engine
section 2 directly into the casing 6.
[0040]
The rear of the heat exchanger block 4 is provided with
a first coolant-pool portion 26A communicating to the second
water inlet 14B and a second water outlet 15B that are formed
through the back wall of the second chamber 9. The coolant in
the second chamber 9 is caused to flow into the first
coolant-pool portion 26A through the second water inlet 14B.
Then, the coolant in the first coolant-pool portion 26A is
returned into the =second chamber 9 through the second water
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outlet 15B.
[0041]
Further, the rear of the heat exchanger block 4 is provided
with a second coolant-pool portion 26B communicating to the
third water inlet 140 and a third water outlet 150 that are formed
through the back wall of the second chamber 9. The coolant in
the second chamber 9 is caused to flow into the second
coolant-pool portion 26B through the third water inlet 140.
Then, the coolant in the second coolant-pool portion 26B is
returned into the second chamber 9 through the third water
outlet 150.
[0042]
In the water supply/drainage pump I configured as
described above, the coolant is caused to flow into the cooling
passage 13 and the coolant pool portions 26A and 26B. With this,
the exhaust passage 18 can be cooled. Thus, in the exhaust
passage 18, thermal expansion of the exhaust gas can be
restrained, and noise of the exhaust gas can be damped. In
addition, the thermal expansion of the exhaust gas can be
restrained before the exhaust gas is discharged into the muffler
passage 21. With this, unlike the related art, the heat of the
exhaust gas is not radiated from the muffler passage 21.
[0043]
Further, the heat exchanger block 4 is made of a die-cast
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aluminum excellent in heat radiation efficiency. With this,
cooling effect by the exhaust passage 18 can be increased. As
a result, the noise damping effect can be increased.
[0044]
In addition, also after the pump section 3 stops driving,
the coolant in the cooling passage 13 continues to be convected
by temperature difference. With this, the coolant to be used
in the cooling passage 13 can be maintained at appropriate
temperature.
In the exhaust passage 18, explosive noise of the exhaust
gas is damped, and then the exhaust gas is caused to flow into
the muffler passage 21 such that the noise of the exhaust gas
can be further damped in the muffler passage 21. With this,
performance of damping the noise of the exhaust gas to be
discharged into the casing 6 through the muffler passage 21 is
further enhanced.
In addition, in the heat exchanger block 4, the muffler
passage 21 is located along an outer portion of the second
chamber 9 therebehind. Thus, the muffler passage 21 also can
be cooled by the coolant in the second chamber 9.
[0045]
Even when condensed water is generated in the exhaust
passage 18 as a result of cooling the exhaust gas in the exhaust
passage 18, as indicated by the arrows in FIG. 11(a) and FIG.
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11 (b) , the condensed water is guided downward by back pressure
(pressure of the exhaust gas) through the clearances 20A between
the radiating fins 20. In other words, the condensed water is
guided sequentially from the upper portion to the lower portion
of the exhaust passage 18. The lower portion of the exhaust
passage 18 is provided with a first drain 27, and the condensed
water guided to the lower portion of the exhaust passage 18 is
drained to the outside through the first drain 27.
[0046]
Further, even when condensed water is generated in the
muffler passage 21 as a result of cooling the exhaust gas in
the muffler passage 21, as indicated by the arrows in FIG. 12,
the condensed water flows along the bottom walls of the muffler
chambers 23, and is guided sequentially into lower ones of the
muffler chambers 23 through the second exhaust-gas connection
ports 24. A lower portion of the muffler passage 21 is provided
with a second drain 28, and the condensed water guided to the
lower portion of the muffler passage 21 is drained to the outside
through the second drain 28.
[0047]
With such a configuration, even when the condensed water
is generated as a result of cooling the exhaust passage 18 and
the muffler passage 21, the condensed water is drained to the
outside through the first drain 27 and the second drain 28. With
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this, it is possible to effectively prevent the heat exchanger
block 4 made of die-cast aluminum from being deteriorated,
specifically, being deformed through corrosion by influence of
components of the exhaust gas (such as sulfur) which components
are contained in the condensed water.
[0048]
As illustrated in FIG. 13 and FIG. 14, a stopper flap 29
configured to restrain foreign matter such as pebbles from
entering the cooling passage 13 through the first water inlet
14A is mounted to a lower portion of the second chamber 9 of
the heat exchanger block 4. A clearance 29A is secured between
a curved portion 29B of the stopper flap 29 and the back wall
of the second chamber 9. With this, a flow path for the coolant
into the first water inlet 14A is narrowed.
[0049]
With such a configuration, in a case where the water
supply/drainage pump 1 is used for supplying/draining the water
for the irrigation channels, even when the foreign matter such
as pebbles is contained in the water to be supplied and enters
the first chamber 8, the foreign matter such as pebbles can be
caught in the clearance 29A. In this way, the foreign matter
can be prevented from entering the cooling passage 13 through
the first water inlet 14A. In addition, the stopper flap 29
mounted as described above is capable of adjusting a size of
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the clearance 29A. Thus, in a case of supplying/draining water
containing sand, by setting the size of the clearance 29A as
small as possible, the sand can be prevented from entering the
cooling passage 13.
[0050]
In case where foreign matter 30 enters the cooling passage
13, as indicated by the arrows in FIG. 15, the foreign matter
30 is moved from a lower side to an upper side of the cooling
passage 13 by pressure of supplying/draining the water with the
pump section 3. Then, as indicated by the arrow in FIG. 16,
the foreign matter 30 is moved from the chamber connection port
13B to the first water outlet 15A, and lastly moved back to the
second chamber 9. In this way, the foreign matter 30 can be
prevented from stagnating in the cooling passage 13, and the
cooling passage 13 can be prevented from being clogged with the
foreign matter 30.
[0051]
(Casing)
As illustrated in FIG. 17 and FIG. 18, the engine section
2 and the heat exchanger block 4 are covered with the box-shaped
casing 6. The casing 6 includes both a left side plate 60 and
a right side plate 61, a rear side plate 62, a top plate 63,
and a bottom plate 64. In the casing 6, a front side on which
the pump section 3 is located is opened, and an opening portion
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65 is formed thereat. A partition plate 66, which is freely
removable, is mounted to the opening portion 65, and the opening
portion 65 is freely opened/closed by the partition plate 66.
The engine section 2 and the heat exchanger block 4 are
located on an inside of the casing 6 with respect to the partition
plate 66 of the casing 6, and the pump section 3 is located on
an outside of the casing 6 with respect to the partition plate
66.
Note that, in the present invention, the left and right
side plates 60 and 61, the rear side plate 62, the top plate
63, and the bottom plate 64 may be formed integrally with each
other in advance.
[0052]
A fuel filler port 5a of the fuel tank 5 is opened in the
top plate 63, and a fuel filler cap 5A is fitted to the fuel
filler port 5a.
[0053]
The engine section 2, the pump section 3, and the heat
exchanger block 4 are elastically supported by
vibration-damping leg portions 70 arranged on the bottom plate
64 of the casing 6. With this, vibration of the engine section
2, the pump section 3, and the heat exchanger block 4 during
operation is absorbed by the vibration-damping leg portions 70.
[0054]
CA 02956756 2017-01-31
OurRa:2949213
In the casing 6, a casing-side intake port 6A (refer to
FIG. 2) configured to allow air for cooling the engine section
2 to be taken into the casing 6 is opened behind the engine
section 2. Further, a casing-side exhaust port 6B configured
to allow the exhaust gas, which has been discharged into the
casing 6 through the second exhaust port 25, to be discharged
to the outside of the casing 6 is opened in the left side plate
60 of the casing 6. The exhaust gas that is discharged from
the engine section 2 and stagnates in the casing 6 is discharged
to the outside of the casing 6 through the casing-side exhaust
port 63.
[0055]
A substantially central portion of the partition plate
66 is provided with an opening portion 67 configured to allow
the body 3a of the pump section 3 to be protruded to the outside
through the partition plate 66 of the casing 6. The opening
portion 67 is formed in conformity with an outer shape of the
heat exchanger block 4.
[0056]
A sealing member 80 made, for example, of polyurethane
and having a vibration damping function and a noise damping
function is fitted to a joint part between the heat exchanger
block 4 and the partition plate 66.
The sealing member 80 is formed into an annular shape
26
CA 02956756 2017-01-31
. . .
Our Ref: 29492-13
conforming to the outer shape of the heat exchanger block 4 so
as to be fitted to an outer peripheral portion of the heat
exchanger block 4. When the partition plate 66 is fitted to
the opening portion 65 of the casing 6 so as to close the opening
portion 65, the partition plate 66 causes the sealing member
80 to be pressed against a block surface of the heat exchanger
block 4. With this, the joint part between the heat exchanger
block 4 and the partition plate 66 is closed by the sealing member
80.
[0057]
Note that, in the present invention, the sealing member
made, for example, of polyurethane need not necessarily be
formed into the annular shape, and may be fitted in a manner
of filling the joint part between the pump section 3 and the
heat exchanger block 4.
[0058]
(Conclusion)
As described hereinabove, in the water supply/drainage
pump 1 according to the embodiment of the present invention,
main passages of the water supply/drainage pump 1, such as the
exhaust passage 18 and the cooling passage 13, can be
collectively formed within the heat exchanger block 4. Further,
only by mounting the heat exchanger block 4 to the body 3a of
the pump section 3, the chambers 8 and 9 that serve as water
27
CA 02956756 2017-01-31
,
, . .
Our Ref: 29492-13
supply/drainage passages and the cooling passage 13 can be
connected to each other. In this way, piping arrangement can
be easily made in the water supply/drainage pump 1. With this,
the water supply/drainage pump 1 can be downsized.
[0059]
Further, noise of the exhaust gas can be damped in the
exhaust passage 18. Thus, related-art large mufflers can be
omitted.
[0060]
Still further, the heat exchanger block 4 mounted to the
body 3a of the pump section 3 is freely removable. Thus, there
is an advantage in that removal of the heat exchanger block 4
from the body 3a of the pump section 3 facilitates cleaning of
the cooling passage 13, the exhaust passage 18, and other parts
of the water supply/drainage pump 1.
[0061]
Yet further, the engine section 2 and the heat exchanger
block 4 are covered with the casing 6. With this, driving noise
of pistons and cylinders in the engine section 2, driving noise
of tappets in the engine section 2, operating noise of the
cooling fan of the engine section 2, noise generated by the heat
exchanger block 4, and other noises can be restrained from
leaking to the outside. In addition, adhesion of dust, for
example, to the engine section 2 and the heat exchanger block
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CA 02956756 2017-01-31
. . .
Our Ref: 29492-13
4 can be prevented.
[0062]
Yet further, the heat exchanger block 4 is mounted to the
body 3a of the pump section 3 between the engine section 2 and
the pump section 3. In this structure, with respect to the
partition plate 66 of the casing 6, the engine section 2 and
the heat exchanger block 4 are located on the inside of the casing
6, and the pump section 3 is located on the outside of the casing
6. Thus, the inlet 3A and the outlets 3B of the pump section
3 are not covered with the casing 6. With this, hoses can be
easily connected to/disconnected from the inlet 3A and the
outlets 3B.
[0063]
Yet further, the joint part between the heat exchanger
block 4 and the partition plate 66 is closed by the sealing member
80. With this, leakage of the noises in the casing 6 can be
prevented. Further, the sealing member 80 has the vibration
damping function, and hence vibration to be generated by driving
the engine section 2 and vibration to be transmitted to the
casing 6 can be absorbed by the sealing member 80.
[0064]
Yet further, the temperature of the exhaust gas to be
discharged from the heat exchanger block 4 into the casing 6
is reduced. Thus, the casing 6 to be used can be downsized.
29
CA 02956756 2017-01-31
Our Ref: 29492-13
As a result, the water supply/drainage pump 1 to be provided
can be compactified and have both a cooling function and a noise
damping function.
[ 00 65]
The present invention is not limited to the embodiment
described hereinabove. Specifically, those skilled in the art
may make various modifications,
combinations,
sub-combinations, and alterations of the components of the
above-described embodiment within the technical scope of the
present invention or the equivalents thereof.
Industrial Applicability
[0066]
The present invention is widely applicable to any
engine-driven pump configured to supply/drain water, such as
an engine-driven pump for washing or other various purposes.
Reference Signs List
[0067]
1 water supply/drainage pump
2 engine section
3 pump section
3a body
3C opening portion
CA 02956756 2017-01-31
Our Ref: 29492-13
3D lid member
4 heat exchanger block
6 casing
7 volute chamber
8 first chamber
9 second chamber
pump drive shaft
10a front end
12 impeller
14A first water inlet
15A first water outlet
18 exhaust passage
19 first exhaust port
radiating fin
21 muffler passage
66 partition plate
80 sealing member
31
