JPH10127556A - Pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump unit consisting of plural pumps suitable for a dishwasher. SOLUTION: This pump device has a first impeller 81 of a washing pump 51 and a second impeller 82 of a drain pump 52. Both impellers stored in a casing 80 are rotatable around a same shaft and are driven by a motor 90. An attaching member 83a is placed on the casing 80 so that the attaching member 83a will not overlap with the inner space of the casing 80 seen from front. The motor 90 is attached to the attaching member 83a and fixed with screws from one direction of the casing 80. The pump device 8 can be assembled from the same direction. The part near the spout of a second flow room 72 of the drain pump 52 is tapered in the axial direction, so that water can be powerfully sprayed from the spout. With such a structure, increase of the load on the washing pump 51 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device in which a plurality of pumps are formed in one unit and driven by a single driving device. In particular, the present invention relates to a pump device suitable for a dishwasher for washing and rinsing dishes.

[0002]

2. Description of the Related Art Conventionally, in a dishwasher, there is provided a pump device in which both a washing pump comprising a vortex pump for washing and rinsing and a drainage pump comprising a vortex pump for draining are formed in one unit. Used.
In this pump device, the respective impellers constituting both pumps are connected coaxially and driven by a single motor, and the operation of both pumps can be switched according to the rotation direction of the motor (for example, the actual 3- 46709).

[0003] In such a pump device, the motor is mounted on the end of the casing on the vortex pump side via a mounting member. The mounting member is formed in a cantilevered leg shape at the end of the casing, and is less protruded from the casing so that stress is not applied to the cantilevered base. By the way, in a dishwasher, a cleaning pump frequently used tends to have a larger outer shape than a drainage pump.

[0004]

However, if the cleaning pump is larger than the drainage pump, the mounting member on the drainage pump side will be disposed so as to overlap with the cleaning pump. Is difficult to do. For example, by attaching a mounting bracket to the end face of the motor,
A mounting member is mounted on the mounting bracket and screwed and fixed from the motor side. Thereafter, the impeller was attached to the rotating shaft of the motor from the opposite direction. As a result, the assembling direction is not constant, and the assembled product is reversed during the assembling. On the other hand, in consideration of the assembling workability, it is desirable that each part of the motor and the pump can be sequentially assembled from one direction.

By the way, in a dishwasher drain pump,
There is also a demand for flowing water vigorously so that residual vegetables and oils and fats in drainage do not adhere to the drainage pipe. On the other hand, the impeller of the drainage pump acts as a load on the cleaning pump because the impeller is in the water when the cleaning pump is operating, and thus there is a conflicting problem that it is desired to avoid such an increase in the load.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pump device in which a plurality of pumps are unitized, which is suitable for a dishwasher and solves the technical problems as described above.

[0007]

According to a first aspect of the present invention, there is provided a pump apparatus comprising: a first flow path chamber;
A casing defining a second flow path chamber smaller than the first flow path chamber; and a first rotatably provided first flow path chamber.
An impeller and a second impeller coaxially connected to the first impeller and rotatably provided in the second flow path chamber, the first pump being constituted by the first flow path chamber and the first impeller. In a pump device in which a second pump is constituted by the second flow passage chamber and the second impeller, and a driving device for driving the first impeller and the second impeller is attached to the casing, the casing is disposed on the second flow passage chamber side. And a mounting member for mounting the driving device on the second impeller so as to avoid overlapping with both flow path chambers when viewed from a direction parallel to the rotation axis of the second impeller.

According to this configuration, the mounting member is arranged so as not to overlap with the flow path chamber, so that the casing can be prevented from obstructing when the driving device is mounted on the mounting member. As a result, fixing work such as screw fastening between the mounting member and the driving device can be performed from the direction of the casing, so that workability during assembly is good.

According to a second aspect of the present invention, in the pump device according to the first aspect, the casing further includes a rib connected to a mounting member from a boundary between the two flow chambers. And According to this configuration, in addition to the operation of the invention according to claim 1, the rib connected to the mounting member can reinforce the mounting member, so that the mounting member is cantilevered to avoid overlapping with the flow path chamber. Even when formed in a shape, deformation of the mounting member can be prevented.

In particular, since the rib can directly reinforce the mounting member and the first flow passage chamber, the deformation of the mounting member with respect to the first flow passage chamber can be reliably prevented. Further, the rib is preferable because the boundary can be reinforced. The pump device according to the third aspect of the present invention is the first aspect.
Or the pump device according to 2, wherein the second channel chamber is
A suction port and a discharge port are formed on the peripheral surface thereof, and the suction port and the discharge port are formed narrow at a portion near the discharge port along a direction in which water flows from the suction port to the discharge port.

According to this configuration, in addition to the effect of the invention according to claim 1 or 2, the water passage is narrower at the portion closer to the discharge port than at the portion closer to the suction port. As a result of increasing the flow velocity of the water, the water can flow out of the discharge port vigorously. Further, the second pump having a narrow water channel has a smaller load when the first pump is in operation when there is water in the second flow path chamber than when the second impeller is enlarged. It is preferable to prevent the occurrence of

According to a fourth aspect of the present invention, in the pump device according to the third aspect, the second flow path chamber is provided with a second flow path chamber.
It is characterized in that it is narrowed in a direction parallel to the rotation axis of the impeller. According to this configuration, in addition to the effect of the invention according to claim 3, the second pump pumps out water more vigorously than when the second flow path chamber is narrowed in the radial direction of the impeller. be able to.

According to a fifth aspect of the present invention, there is provided a pump device according to the fourth aspect, wherein the second flow path chamber is provided with a second flow path chamber.
The impeller is further narrowed in the radial direction. According to this configuration, in addition to the function of the invention according to claim 4, the second flow path chamber is provided with a second direction perpendicular to the direction in which water flows.
Since it can be made narrower in the direction, it can be made narrower than in the case where it becomes narrower in one direction, and as a result, the second pump can pump water more vigorously.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
This will be described in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view of a schematic configuration of a dishwasher to which a pump device according to an embodiment of the present invention is applied. The dishwasher 1 includes a housing 2 having a box-shaped outer shape, a washing room 3 partitioned in the housing 2, a tableware basket 4 for holding the tableware T in the washing room 3, and a tube 61 provided at the rear of the housing 2. , A water supply mechanism 6 including a valve 62, etc., a cleaning pump 51 for injecting water into the cleaning chamber 3, and an arm 5 connected to the cleaning pump 51 and injecting water from an injection port 5a.

The housing 2 has an openable and closable door 21 disposed on the front surface thereof, and a box-shaped inner tank 22 provided inside and having an open front. The inner bottom of the inner tank 22 is formed in a container shape, and water can be stored therein. The cleaning room 3 is defined by being surrounded by the rear surface of the door 21 and the inner surface of the internal tank 22. The washing chamber 3 can store water at the bottom. Further, a water reservoir 31 formed one step deeper is formed at the front of the bottom of the cleaning chamber 3 so that water in the cleaning chamber 3 can be collected. A reticulated filter 34 is removably attached to the inlet 33 of the water reservoir 31 so as to capture residual vegetables and the like in the water passing therethrough.

In the dishwasher 1, the water supply mechanism 6 is connected to a water supply facility (not shown) such as a water supply, and can supply water into the washing room 3 through a water inlet 32. The supplied water is stored at the bottom of the cleaning chamber 3. The cleaning pump 51 is connected to the water reservoir 31 via a pipe 55 to supply water to the water reservoir 3.
Inhalation from 1 and tableware basket 4 through tube 57 and arm 5
Spray on the tableware inside. Thereafter, the water returns to the water reservoir 31 and is washed while being circulated. Arm 5
Is provided rotatably, rotates by the reaction to spray water,
Tableware can be washed evenly.

The dishwasher 1 has a heater 7 at the bottom of the washing chamber 3. The heater 7 can heat the water in the cleaning chamber 3 and can easily rinse with the warm water. In addition, the heater 7 can heat the surrounding air and dry the dishes with warm air. Further, the dishwasher 1 is provided with a drainage pump 52 that communicates with the bottom of the washing room 3 via a pipe 56, and can drain water through a drainage pipe 54.

The drain pipe 54 is bent in an inverted U-shape at an intermediate portion thereof, and reaches the upper part in the housing 2. Therefore, due to the siphon action, the water passing through the drain pipe 54 does not flow until exceeding the uppermost part, and the drain pipe 54 can block the flow of water without a valve. Further, once the water passes over the top of the drain pipe 54 by the drain pump 52, the water can flow through the drain pipe 54 and be drained. FIG. 1 shows the drainage pipe 54 up to the middle thereof.

The cleaning pump 51 and the drainage pump 52 are configured as a single unit of the pump device 8. The pump device 8 has a motor 9 as its driving device.
0 is provided. One motor 90 drives the cleaning pump 51 and the drain pump 52, and the operation of the cleaning pump 51 and the drain pump 52 can be switched according to the rotation direction of the motor 90.

FIG. 2 is a partial cross-sectional side view of the pump device of FIG. 1, and shows a cross section taken along line C--C of FIG. FIG. 3 is an exploded perspective view of the pump device of FIG. FIG. 4 is a cross-sectional front view of the pump device, and is a cross-sectional view taken along the line DD in FIG. FIG.
FIG. 2 is a sectional front view of the pump device of FIG.
It is E sectional arrow view. First, reference is made to FIGS. In the following, the directions will be described based on the front view, unless otherwise specified.

The pump device 8 includes a motor 90 provided at a rear portion thereof, a plate-like mounting member 91 fixed to a front end surface of the motor 90, and a container-like casing mounted on the front surface of the mounting member 91. Main body 83 and casing main body 83
An oil seal 87 that seals between the motor and the rotating shaft 90a of the motor 90, a second impeller 82 fitted to the rotating shaft 90a, and a plate-like casing wall portion 84 disposed in front of the second impeller 82. , A first impeller 81 penetrating through the casing wall portion 84 and fitted to the rotating shaft 90a at the front side thereof
And a casing cover 85 that accommodates the first impeller 81.
And an O-ring 86 disposed between the casing cover 85 and the casing main body 83 for water sealing.

The motor 90 has a built-in bearing for rotatably supporting a rotating shaft 90a, and the first impeller 81 and the second impeller 82 are rotatably supported by the bearing. This pump device 8 can be assembled as follows. First, a mounting bracket 91 is attached to the front surface of the motor 90 from the front, and a screw 92 is inserted from the front and fixed.

Next, the casing body 83 is attached to the mounting bracket 91.
From the front, and the mounting member 83 of the casing body 83
A screw 93 is inserted from the front into the insertion hole 83i of a, and screwed and fixed. Next, the oil seal 87 is
Is mounted in the casing body 83 while being inserted through the rotary shaft 90a from the front.

Next, the second impeller 82 is fitted into the casing main body 83 on the rotating shaft 90a of the motor 90 from the front. Next, the O-ring 86 is attached to the front flange portion 83d of the casing body 83 from the front. Next, the casing wall portion 84 is fitted and attached to the casing body 83 from the front. At this time, the casing wall 84
The second impeller 82 and the rotating shaft 90a are inserted into an opening formed at the center of the second impeller.

Next, the first impeller 81 is connected to the second impeller 8.
2 and is fitted coaxially to the rotating shaft 90a from the front. Next, the casing body 83 is provided with the casing cover 8.
5 is fitted and attached from the front, and a screw 94 is inserted from the front and fixed. The pump device 8 assembled in this manner is connected to the above-described respective pipes and fixed to the lower surface of the internal tank 22 of the housing 2.

As described above, the pump device 8 can be assembled by working from one direction, namely, the front direction. Hereinafter, each unit will be described. The casing cover 85 is
It has a main body part 85a formed in a container shape opened to the rear, and a flange part 85d as a mounting part is formed at the rear part. The flange portion 85d is fitted and connected to the flange portion 83c of the casing main body 83 with the O-ring 86 interposed therebetween, and has an insertion hole for a screw 94 for fixing the same.

The casing cover 85 is attached to the main body 8.
A front tubular portion 85b extending forward from the center of the front surface of the front portion 5a, and an outlet tubular portion 85c extending upward from a right portion of the peripheral surface of the main portion 85a.
And The outlet tube portion 85c forms a discharge port 71b of the cleaning pump 51, and the front tube portion 85b forms a suction port 71a of the cleaning pump 51. The casing wall 84 includes a casing cover 85 and a casing body 83.
It is arranged to be sandwiched between. Casing wall 84
The rear surface is a portion extending from an upper left portion of a second channel chamber 72 described later to a suction port 72a via a discharge port 72b (this portion is shown in FIG. 4).
(Shown by a one-dot chain line 84a).
An opening through which the second impeller 82 and the rotating shaft 90 a of the motor 90 are inserted is formed in the center of the casing wall 84.

The casing body 83 has a substantially cylindrical container-shaped main part 83d opened forward, an upper cylindrical part 83e extending horizontally from the upper part of the peripheral surface of the main part 83d, and a lower part of the peripheral surface of the main part 83d. A lower tubular portion 83f extending horizontally and a main body portion 8
A mounting leg 83j provided from the outer peripheral surface to the rear surface of the 3d,
The main body 83d has the above-described flange 83c extending from the peripheral edge of the front end. In the flange portion 83c,
A female screw hole is formed. A screw 94 for fixing the casing cover 85 to the flange portion 85d is screwed into the female screw hole.

The upper cylindrical portion 83e forms a discharge port 72b of the drain pump 52. The lower cylindrical part 83f is provided with the drain pump 5
Two suction ports 72a are formed, and the above-mentioned tube 56 is connected. The inner lower surface of the lower cylindrical part 83f is located below the inner peripheral surface of the main part 83d by a distance G (see FIG. 4).
Therefore, since the suction port 72a is formed low with respect to the inner peripheral surface of the main body 83d, water at a lower water level can be sucked as compared with a case where the suction port 72a is not formed low. Further, when sucking the low-level water, the time until the suction of the air can be extended, so that the efficiency of the drain pump 52 due to the suction of the air can be prevented from lowering. The same effect can be obtained even if the position of the pipe 56 connected to the suction port 72a is lowered with respect to the inner peripheral surface of the main body 83d.

The mounting leg portion 83j includes a standing portion (not shown) extending rearward from a rear portion around the main body portion 83d, and a mounting member 83a extending from the rear end of the standing portion in a direction perpendicular to the axial direction.
And a rib 83b provided on the mounting member 83a, so as to be integrally formed with the main portion 83d. Mounting member 8
Reference numeral 3a extends radially outward from the outer peripheral portion of the main body portion 83d, and an insertion hole 83i for a screw 93 for attaching the motor 90 is formed in the vicinity of its end. The insertion hole 83i is arranged at a position where it can avoid overlapping with the flange portion 83c of the casing body 83 and the flange portion 85d of the casing cover 85 in a front view. Therefore, the insertion holes 8 can be formed without disturbing both flange portions.
The screw 93 can be easily inserted into the screw 3i or the screw can be easily tightened. Note that the front view here is
This is because the above-described assembling direction of the pump device 8 is from the front, which is the direction in which the rotating shaft 90a of the motor 90 projects.
Further, the mounting member 83a is not limited to avoiding overlapping with both flange portions. For example, holes through which screws can be inserted and a screw tightening tool can be operated may be formed in both flange portions. In short, the mounting member 83a is an internal space defined by a casing 80, which will be described later, including the casing main body 83, the casing wall portion 84, and the casing cover 85, that is, the first flow passage chamber 71 and the second flow passage. It suffices if overlapping with the road chamber 72 can be avoided.

The mounting member 83a is formed so as not to protrude in the height direction with respect to the flange 83c of the casing body 83 and the flange 85d of the casing cover 85. The upper end of the mounting member 83a is lower than the upper ends of both flanges, and the lower end of the mounting member 83a is
It is higher than the lower end portions of both flange portions, and is formed compact by suppressing the height of the pump device 8.

The rib 83b is provided in the insertion hole 8 of the mounting member 83a.
From the front near 3i, it is connected to the upright portion 83g, the outer peripheral surface of the main portion 83d, and the rear surface of the flange portion 83c, and can reinforce the mounting member 83a to prevent its deformation. The ribs 83b are provided as a pair on both sides of the mounting member 83a. Thus, the rib 83b is
a can be reinforced, the mounting member 83a
The attachment member 83a can be prevented from being deformed even when it is long in a cantilever shape to avoid overlapping with the internal space. In particular, since the rib 83b is connected to the flange portion 83c to directly connect and reinforce the mounting member 83a and the casing cover 85, a first passage chamber (described later) partitioned within the casing cover 85 is provided. 71
, The deformation of the attachment member 83a can be reliably prevented.

The rib 83b can also reinforce the flange 83c, which is the boundary between the two flow chambers.
preferable. That is, when the pump device 8 is used in a dishwasher, the cleaning pump 51 is used for reasons such as frequency of use.
Is larger than the drain pump 52. In such a case, a step like the above-mentioned both flanges occurs at a boundary portion between both pumps, or a connection portion between parts is provided, and as a result, the strength of the boundary portion tends to be weak. Because.

The above-mentioned casing body 83, casing wall 84, and casing cover 85 are combined with each other to function as one casing 80. In the casing 80, a first flow path chamber 71 that rotatably houses the first impeller 81 and a second flow path chamber 72 that rotatably houses the second impeller 82 are defined. The second flow path chamber 72 is formed to have a smaller outer shape in a front view than the first flow path chamber. A flange portion 85d of the casing cover 85, a flange portion 83c of the casing body 83, and a casing wall portion 84 are located at a boundary between the two flow chambers.

The first passage chamber 71 is provided with a casing cover 85.
Of the main body portion 85a and the front surface of the casing wall portion 84. As shown in FIG. 5, the first flow path chamber 71 extends from a central suction port 71a to an outer peripheral discharge port 7a.
1b, and a first impeller 81 is disposed at the center thereof. The first impeller 81 is a rotary impeller having curved blades. First impeller 8
As one rotates, the blades can push water in the center toward the outer periphery. The first impeller 81 and the first flow path chamber 71 constitute the cleaning pump 51.

The washing pump 51 is a so-called spiral pump that draws water from the spiral center and discharges water from the outer periphery of the spiral. When the first impeller 81 rotates counterclockwise as viewed from the front as shown in FIG. 5, the water sucked from the suction port 71a can be pushed toward the outer periphery and discharged to the discharge port 71b. Please refer to FIG.

The second impeller 82 is a rotating disk having a plurality of radial blades. When the second impeller 82 rotates, a vortex is generated around the periphery by the concave portion formed between the blades, and water around the periphery can be moved. The second impeller 82 has a fitting hole in the center thereof, in which a rotation shaft 90a of the motor 90 is fixed, and is arranged at the center of the main body 83d of the casing body 83.

The second channel chamber 72 is defined by an inner surface of the main body 83 d of the casing body 83 and a rear surface of the casing wall 84. The second flow channel chamber 72 is a clock of the second impeller 82 in FIG. 4 during a period from the suction port 72a to the discharge port 72b along the outer periphery of the second impeller 82 (the left portion with respect to the rotation shaft 90a in FIG. 4). Water can be circulated with the rotation in the circumferential direction. During this period, that is, from the suction port 72 a to the discharge port 7 along the outer periphery of the second impeller 82.
The flow path leading to 2b is formed such that its cross section gradually decreases. That is, the inner surface of the main body 83d,
The distance between the outer peripheral surface of the second impeller 82 and the portion near the discharge port 72b is smaller than the portion near the suction port 72a. Further, at the portion near the discharge port 72b (upper portion F in FIG. 4), the casing wall portion 84 is formed to be narrow in the front-rear direction by extending the rear surface of the casing wall portion 84, in which the rotation axis of the second impeller 82 extends. The casing body 8
3 is defined by the inner peripheral surface of the main body 83d and the outer peripheral surface of the second impeller 82 and between the discharge port 72b and the suction port 72a (the right side with respect to the rotation shaft 90a in FIG. 4). In), the interval is formed narrow so that water does not flow.

The drain pump 52 is a so-called vortex pump in which a second flow path chamber 72 and a second impeller 82 are provided, and an impeller rotating in the flow path chamber moves water around it. When the second impeller 82 rotates clockwise in the front view shown in FIG. 4, the water sucked from the lower suction port 72a can be discharged to the upper discharge port 72b. On the other hand, when the second impeller 82 rotates counterclockwise when viewed from the front, water will be sucked in from the upper discharge port 72b, but the discharge port 72b is connected to the drain pipe 54 and functions as a drain pump. do not do.

As described above, in the drain pump 52, the second flow path chamber 72 has a wide portion near the suction port 72a and a narrow portion near the discharge port 72b, particularly the portion F.
As a result, the water moved by the second impeller 82 can be flown out of the discharge port 72b as a result of increasing the flow velocity. Therefore, in the dishwasher, since it is assumed that the water passing through the drain pump 72 is dirty, it is preferable to be able to prevent the dirt from attaching to the flow path.

The drain pump 52 having a narrow water passage in the second flow path chamber 72 has a larger drainage pump 52 when there is water in the second flow path chamber 72 than when the second impeller 82 is enlarged. It is preferable to prevent the load from being applied when the cleaning pump 51 is operated. In addition, the second flow path chamber 72 has a portion F
By being narrowed in the front-rear direction, the drain pump 52 can send out water even more vigorously.

The second passage chamber 72 is narrowed not only in the front-rear direction but also in the radial direction of the second impeller 82 at a portion near the discharge port 72b, so that the second passage chamber 72 is narrowed.
Can be narrowed in two directions orthogonal to the direction in which water flows, so that the width can be further reduced as compared with the case where the width is reduced in one direction. As a result, the drain pump 52 can pump out water even more vigorously.

As described above, according to the present embodiment, as shown in FIG. 5, the mounting member 83a of the casing 80 is arranged so as not to overlap with the two flow chambers, so that the motor 90 can be mounted. When attaching to casing 83a, casing 80 can be prevented from being in the way. As a result, fixing work such as screw fastening between the mounting member 83a and the mounting bracket 91 mounted on the motor 90 can be performed from the front side, which is the direction of the casing 80, so that workability during assembly is good. For example, the assembling direction of the pump device 8 can be made one direction from the casing 80 side, which is the direction in which the impellers are assembled, and the direction of the subassembly such as the pump and the motor is not reversed during the assembly. Only Further, usually, the motor 90 is heavier than the pump device 8. Therefore, it is possible to assemble the pump device 8 while keeping such a heavy motor 90 stationary.

When the mounting member 83a is deformed, in order to prevent both the impellers connected to the motor 90 mounted on the mounting member 83a and the casing 80 from colliding with each other, a space between the impeller and the impeller is prevented. It is necessary to set a large gap, and as a result, the efficiency of each pump cannot be increased. On the other hand, the rib 83b is
According to the present invention which can prevent the deformation of the pump, it is not necessary to increase the gap between each impeller and the casing 80, so that the efficiency of each pump can be increased.

In the cleaning pump 51, the first flow path chamber 7
1 is located farther from the motor 90 than the drain pump 52, and the first impeller 81 is supported on the free end side of the cantilever state, so that the assembly accuracy with respect to the first flow path chamber 71 tends to decrease. It is in. In such a cleaning pump 51, according to the present invention, the deformation of the mounting member 83a with respect to the first channel chamber 71 can be prevented by the rib 83b.
The accuracy of assembling the first impeller 81 and the first flow path chamber 71 can be increased through 3a, and the efficiency of the cleaning pump 51 can be increased.

The mounting bracket 91 and the mounting member 83a are
It does not protrude from the outer shapes of both flange portions of the motor 90, the casing body 83, and the casing cover 85 in side view. Therefore, even if the attachment member 83a and the like are arranged so as not to overlap with the flow path chamber, the height of the pump device 8 can be suppressed, and the dishwasher 1 can be made compact. Note that the pump device 8 includes the motor 90 as a driving device, but is not limited thereto. For example, the second impeller 8
2 may be configured to be rotatably supported by the bearing in the casing 80 and to be connected to the rotating shaft 90a via a joint. In short, the first, which corresponds to the aforementioned cleaning pump 51,
And a second pump corresponding to the drainage pump 52 may be arranged adjacently and driven by a single driving device.

In addition, various design changes can be made without departing from the spirit of the present invention.

[0048]

According to the first aspect of the present invention, the following effects can be obtained. That is, since the mounting member is arranged so as not to overlap with the flow path chamber, fixing work such as screw tightening when mounting the driving device to the mounting member can be performed from the direction of the casing side. Good workability at the time.

According to the second aspect of the invention, in addition to the effect of the first aspect, the mounting member can be reinforced by the ribs, so that the deformation of the mounting member can be prevented. In particular, the rib directly connecting the mounting member and the first flow path chamber can reliably prevent the deformation of the mounting member with respect to the first flow path chamber.
In addition, the rib can also reinforce the boundary part,
preferable.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect, a water passage narrower in a portion closer to the discharge port than in a portion closer to the suction port can increase the flow rate of water. As a result, the water can rush out of the outlet. Further, the second pump having a narrow water channel prevents a load during the operation of the first pump even if there is water in the second flow path chamber, as compared with a case where the second impeller is enlarged. Preferred for

According to the fourth aspect of the present invention, in addition to the effect of the third aspect of the present invention, the second flow path chamber is narrower in the direction of the rotation axis, so that water can be sent out more vigorously. . According to the invention according to claim 5, in addition to the effect of the invention according to claim 4, the second flow path chamber can be further narrowed by being narrowed in two directions orthogonal to the direction in which water flows. The second pump can pump water even more vigorously.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a schematic configuration of a dishwasher to which a pump device according to an embodiment of the present invention is applied.

FIG. 2 is a partial cross-sectional side view of the pump device of FIG.

FIG. 3 is an exploded perspective view of the pump device of FIG. 2;

4 is a cross-sectional front view of the pump device of FIG. 2, and is a cross-sectional view taken along a line D-D of FIG. 2;

5 is a cross-sectional front view of the pump device of FIG. 2, and is a cross-sectional view taken along the line EE of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dishwasher 8 Pump apparatus 51 Cleaning pump 52 Drainage pump 71 1st flow path chamber 72 2nd flow path chamber 72a Suction port 72b Discharge port 80 Casing 81 First impeller 82 Second impeller 83a Mounting member 83b Rib 83c Flange (boundary) Part) 90 motor (drive device)

Claims (5)

[Claims] A first flow chamber; a casing defining a second flow chamber smaller than the first flow chamber; a first impeller rotatably provided in the first flow chamber; A second impeller that is coaxially connected to the first impeller and rotatably provided in the second flow chamber; a first pump is configured by the first flow chamber and the first impeller; In a pump device in which a second pump is configured by the road chamber and the second impeller, and a driving device for driving the first impeller and the second impeller is attached to the casing, the casing includes a driving device on the second flow path chamber side. When viewed from a direction parallel to the rotation axis of the second impeller for mounting,
A pump device comprising: a mounting member disposed so as not to overlap with both flow chambers. 2. The pump device according to claim 1, wherein the casing further includes a rib connected to a mounting member from a boundary between the two flow chambers. 3. The pump device according to claim 1, wherein the second flow path chamber has a suction port and a discharge port formed on a peripheral surface thereof, and extends along a direction in which water flows from the suction port to the discharge port. Further, the pump device is formed narrow at a portion near the discharge port. 4. The pump device according to claim 3, wherein the second flow passage chamber is narrowed in a direction parallel to a rotation axis of the second impeller. 5. The pump device according to claim 4, wherein the second passage chamber is further narrowed in a radial direction of the second impeller.