KR19980033337A - Pump gear - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device comprising a plurality of pumps as one unit and driven as a single drive device, and particularly aims to provide a pump device which is very suitable for a dish washing machine for washing and rinsing dishes.

To this end, the pump apparatus of the present invention comprises a casing for partitioning the first flow path chamber and the second flow path chamber adjacent to the first flow path chamber, a first impeller rotatably installed in the first flow path chamber, and a coaxial shaft to the first impeller. A second impeller connected to the second flow chamber and rotatably installed in the second flow path chamber, wherein the first pump is constituted by the first flow chamber and the first impeller, and the second pump is constituted by the second flow chamber and the second impeller. In the pump device, the driving device for driving the first impeller and the second impeller is attached to the casing, and switching the operation of both pumps by switching the rotation direction of both impeller,

The second flow path chamber is characterized in that a suction port and a discharge port are formed on the circumferential surface thereof, and the discharge port side portion is narrowly formed according to the direction of water flowing from the suction port to the discharge port.

Description

Pump gear

The present invention relates to a pump device configured to drive a single drive by configuring a plurality of pumps in one unit. In particular, it is related with the pump apparatus which is very suitable for the dishwasher which wash | cleans and rinses dishes.

Background Art [0002] Conventionally, in the dishwasher, a washing and draining pump apparatus comprising both a washing pump consisting of a centrifugal pump for washing and rinsing and a drain pump consisting of a vortex pump for draining as one unit is used. In this pump device, each impeller constituting both pumps is coaxially connected, and driven by a single motor to switch the operation of both pumps according to the rotational direction of the motor (for example, Japanese Utility Model Publication No. 3-). 46709).

In the centrifugal pump, an inlet is provided at the front central portion of the casing in which the impeller is disposed, and a discharge port is provided at the peripheral surface of the casing. It is a pump of the type that discharges from the discharge port on the surface.

On the other hand, the vortex pump is a pump of a type in which a suction port and a discharge port are provided on the circumferential surface of the casing in which the impeller is arranged, and water is sent from the suction port to the discharge port by vortices generated by the impeller blades by the rotation of the impeller.

By the way, in the drain pump of the dishwasher, there is a desire to force the flow of water so that residual debris or fat or oil in the drainage does not adhere to the drain pipe. On the other hand, since the impeller of the drain pump of the said washing | cleaning and drain pump apparatus acts as a load of a washing | cleaning pump in water at the time of operation | movement of a washing | cleaning pump, there exists also the contrary subject that there is a desire to avoid such an increase of such a load.

In the cleaning and drainage pump apparatus as described above, the motor is attached to the casing end on the vortex pump side via an attachment member. The attachment member is formed in the shape of the cantilever leg at the end of the casing, and has less protruding from the casing so that stress is not applied to the base of the cantilever shape.

By the way, in the dishwasher, the appearance of the washing pump having a high frequency of use tends to be larger than that of the drain pump.

However, if the cleaning pump is larger than the drain pump, the attachment member on the drain pump side is arranged to polymerize with the cleaning pump, so that the assembly work on the cleaning pump side is difficult. For example, the attachment anvil is attached to the end face of the motor, and the attachment member is attached to the attachment anvil and screwed and fixed from the motor side. Then, the impeller was attached to the rotating shaft of the motor in the opposite direction. As a result, the assembly direction was not constant and the assembly was reversed in the middle of assembly. On the other hand, in consideration of the assembly workability, it is preferable to assemble each part of the motor and the pump in order from one direction.

It is therefore an object of the present invention to provide a pump device in which a plurality of pumps which are very suitable for a dishwasher which solve the technical problem as described above are unitized.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side sectional view of a schematic configuration of a dish washing machine to which a pump device according to an embodiment of the present invention is applied.

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

3 is an exploded perspective view of the pump apparatus of FIG.

FIG. 4 is a sectional front view of the pump device of FIG. 2, seen from the line D-D of FIG. 2; FIG.

FIG. 5 is a cross sectional front view of the pump apparatus of FIG. 2, seen from the line E-E of FIG. 2. FIG.

Explanation of symbols for the main parts of the drawings

1: dishwasher

8: pump device

51: cleaning pump

52: drain pump

71: first euro seal

72: second flow chamber

72a: inlet

72b: discharge port

80 casing

81: the first impeller

82: second impeller

83a: attachment member

83b: rib

83c: flange part (boundary part)

90: motor (drive mechanism)

In order to achieve the above object, the pump device of the invention according to claim 1 comprises a casing for partitioning the first flow path chamber and the second flow path chamber adjacent to the first flow path chamber, and a first impeller rotatably installed in the first flow path chamber. And a second impeller connected to the first impeller coaxially and rotatably installed in the second flow path chamber, wherein the first pump is constituted by the first flow chamber and the first impeller, and the second flow chamber and the second impeller In the pump device comprising a second pump, a drive device for driving the first impeller and the second impeller is attached to the casing, the pump device configured to switch the operation of both pumps by switching the rotation direction of both impeller, the second flow path chamber is A suction port and a discharge port are formed in the circumferential surface thereof, and the discharge port side portion is narrowly formed along the direction in which water flows from the suction port to the discharge port.

According to this structure, since the channel of the second flow path chamber is narrower in the discharge port side than in the suction port side part, the water flowing in the discharge port side part can flow out from the discharge port as a result of the flow velocity being increased.

Moreover, since the 2nd pump which narrowed the channel of the 2nd flow path chamber is made to improve the drainage capacity, without making a 2nd impeller larger, the 2nd impeller is in the presence of water in the 2nd flow path chamber at the time of operation of a 1st pump. Even if it drives, it will not become a load compared with the case where the 2nd impeller is enlarged and a drainage capacity is raised.

The pump device of the invention according to claim 2 is the pump device according to claim 1, wherein the second flow path chamber is narrowed in a direction parallel to the rotation axis of the second impeller.

According to this structure, in addition to the effect | action of the invention which concerns on Claim 1, compared with the case where the 2nd flow path chamber becomes narrow in the radial direction of an impeller, a 2nd pump can send water more powerfully.

The pump device of the invention according to claim 3 is the pump device according to claim 2, wherein the second flow path chamber is further narrowed in the radial direction of the second impeller.

According to this structure, in addition to the effect | action of the invention which concerns on Claim 2, the 2nd flow path chamber becomes narrow in two directions orthogonal to the direction through which water flows, and can be made more narrow compared with the case where it narrows in one direction, As a result, it is 2nd The pump can send water more powerfully.

The pump device of the invention according to claim 4 is the pump device according to claim 1, wherein the casing has a second impeller for partitioning the second flow path chamber smaller than the first flow path chamber and for attaching a drive device to the second flow path chamber side. It is characterized in that it is provided in the direction parallel to the axis of rotation of the both flow path chamber and the attachment member arrange | positioned avoiding polymerization.

According to this structure, in addition to the effect | action of the invention which concerns on Claim 1, it arrange | positions avoiding superposition | polymerization with a flow path chamber, and it can prevent that a casing becomes obstructive when attaching a drive apparatus to an attachment member. As a result, fixing work, such as screwing of an attachment member and a drive device, can be performed from the casing side direction, and therefore workability at the time of assembly is excellent.

The pump device of the invention according to claim 5 is the pump device according to claim 4, wherein the casing further includes a rib connected to the attachment member at the boundary portion of the two flow path chambers.

According to this structure, in addition to the effect | action of the invention concerning Claim 4, since the rib connected to the attachment member can reinforce the attachment member, even if it is formed in a cantilever shape in order to avoid superposition | polymerization with a flow path chamber, an attachment member Can prevent deformation.

In particular, since the rib can directly reinforce the attachment member and the first flow path chamber, the deformation of the attachment member to the first flow path chamber can be reliably prevented. The rib is also preferable because it can also reinforce the boundary portion.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described in detail, referring an accompanying drawing. 1 is a side sectional view of a schematic configuration of a dish washer to which the pump device according to the embodiment of the present invention is applied.

The dishwasher 1 has a box-shaped housing 2, a washing chamber 3 partitioned within the housing 2, and a dish basket 4 holding the dishes T in the washing chamber 3. ), A water supply mechanism 6 including a pipe 61, a valve 62, and the like provided at the rear of the housing 2, a washing pump 51 for spraying water into the washing chamber 3, and a washing pump. The arm 5 which is connected to 51 and injects water from the injection port 5a is provided.

The housing 2 has a door 21 which can be opened and closed, and a box-shaped inner tub 22 having an open front provided therein. The inner tank 22 has an inner bottom portion formed in a container shape to store water therein.

The cleaning chamber 3 is partitioned by being surrounded by the rear surface of the door 21 and the inner surface of the inner tank 22. The cleaning chamber 3 can store water in the bottom thereof. Moreover, the water storage part 31 formed deeper so that the water of the washing | cleaning chamber 3 may be collected in the whole bottom part of the washing | cleaning chamber 3 is formed. A mesh-shaped filter 34 is detachably attached to the inlet 33 of the water storage unit 31 to capture residual residues 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 tap water, and can supply water through the water inlet 32 in the washing chamber 3. The water supplied is stored in the bottom of the washing chamber 3. The washing pump 51 is connected to the water storage unit 31 via the tube 55, and sucks water from the water storage unit 31 to allow the washing pump 51 to enter the dish basket 4 through the tube 57 and the arm 5. Spread on the tableware. Thereafter, the water is returned to the water storage unit 31 and rinsed while being circulated. In addition, the arm 5 is rotatably provided and can rotate in reaction to spray water to clean dishes without spots.

Moreover, the dishwasher 1 is equipped with the heater 7 in the bottom of the washing room 3. The heater 7 can heat the water in the washing chamber 3, and washing and rinsing are performed with this warm water. The heater 7 may heat the surrounding air to dry the dishes with warm air.

Moreover, the dishwasher 1 is equipped with the drain pump 52 which communicates with the bottom of the washing | cleaning room 3 via the pipe 56, and can drain through the drain pipe 54. FIG.

The drain pipe 54 is bent in an inverted U shape to reach the upper part of the housing 2. Therefore, the water passing through the drain pipe 54 by the siphon action does not flow until it passes the uppermost part, and the drain pipe 54 can prevent the flow of water without a valve. Moreover, once water exceeds the uppermost part of the drain pipe 54 by the drain pump 52, the drain pipe 54 can be circulated and drained. 1, the drain pipe 54 is shown to the middle part.

The washing pump 51 and the drain pump 52 are configured as the pump device 8 of one unit.

The pump device 8 is provided with a motor 90 as its driving device. One motor 90 drives the cleaning pump 51 and the drain pump 52 to switch the operation of the cleaning pump 51 and the drain pump 52 according to the rotational direction of the motor 90.

FIG. 2 is a partial cross-sectional side view of the pump apparatus of FIG. 1, showing the C-C cross section of FIG. 3 is an exploded perspective view of the pump apparatus of FIG. FIG. 4 is a cross sectional front view of the pump apparatus, seen from the D-D section line of FIG. 2; FIG. FIG. 5 is a sectional front view of the pump apparatus of FIG. 2, seen from the section line E-E of FIG. First, reference is made to FIGS. 2 and 3. In addition, below, the direction is demonstrated based on a front view except the case where it shows in particular.

The pump device 8 includes the above-described motor 90 installed at the rear, a plate-shaped attachment anvil 91 fixed to the front end face of the motor 90, and a container attached to the front surface of the attachment anvil 91. A casing body 83 having a shape, an oil seal 87 sealing between the casing body 83 and the rotation shaft 90a of the motor 90, a second impeller 82 coupled to the rotation shaft 90a, A plate-shaped casing wall portion 84 disposed on the front side of the second impeller 82, a first impeller 81 penetrating the casing wall portion 84, and coupled to the rotation shaft 90a on the front side thereof; The casing cover 85 which accommodates the 1 impeller 81, and the O-ring 86 arrange | positioned between the casing cover 85 and the casing main body 83, and water-sealed are provided.

The motor 90 incorporates a bearing for rotatably supporting the rotating shaft 90a, and rotatably supports the first impeller 81 and the second impeller 82 by the bearing.

This pump apparatus 8 can be assembled as follows.

First, the attaching anvil 91 is attached to the front of the motor 90 from the front, and the screw 92 is inserted into the front to fix it.

Next, the casing main body 83 is attached to the mounting anvil 91 at the front, and the screw 93 is inserted through the insertion hole 83i of the attaching member 83a of the casing main body 83 from the front so as to be screwed. Tighten and fix.

Next, the oil seal 87 is attached to the casing main body 83 while penetrating through the rotation shaft 90a of the motor 90 from the front side.

Next, the second impeller 82 is coupled to the rotating shaft 90a of the motor 90 from the front of the casing main body 83 and attached.

Next, the O-ring 86 is attached to the flange portion 83d in front of the casing main body 83 from the front side.

Next, the casing wall portion 84 is fitted to the casing main body 83 from the front and attached thereto. At this time, the second impeller 82 and the rotation shaft 90a are inserted through the opening formed in the center of the casing wall portion 84.

Next, the first impeller 81 is fitted to the rotation shaft 90a coaxially with the second impeller 82 from the front and attached thereto.

Next, the casing cover 85 is fitted to the casing main body 83 from the front, and the screw 94 is inserted through the front to fix it.

The pump device 8 assembled in this way is connected to each pipe mentioned above, and is fixed to the lower surface of the inner tank 22 of the housing | casing 2.

Thus, this pump apparatus 8 can be assembled by the operation | work from one direction of the front.

Hereinafter, each part is demonstrated.

The casing cover 85 has a main body portion 85a formed in a container shape with an open rear side, and a flange portion 85d as an attachment portion is formed at the rear side. The flange portion 85d is connected to the flange portion 83c of the casing main body 83 via the O-ring 86, and has an insertion hole of the screw 94 for fixing the flange portion 85d.

The casing cover 85 includes a front cylindrical portion 85b extending forward from the center of the front surface of the main body portion 85a and an outlet cylindrical portion 85c extending upward from the right side of the circumferential surface of the main body portion 85a. Has The outlet cylindrical part 85c forms the discharge port 71b of the washing | cleaning pump 51, and the front cylinder part 85b forms the suction port 71a of the washing | cleaning pump 51. As shown in FIG.

The casing wall portion 84 is sandwiched and disposed between the casing cover 85 and the casing body 83. The rear surface of the casing wall portion 84 is a portion extending from the upper left side of the second flow path chamber 72 to be described later through the discharge port 72b to the suction port 72a (this part is shown by dashed-dotted line 84a in FIG. 4). Protruding backward from the. Moreover, the opening part which the 2nd impeller 82 and the rotating shaft 90a of the motor 90 penetrates is formed in the center part of the casing wall part 84. As shown in FIG.

The casing main body 83 has a substantially cylindrical container-shaped main body portion 83d having an open front, an upper cylindrical portion 83e extending horizontally from an upper portion of the circumferential surface of the main body portion 83d, and a main body portion 83d. A lower cylindrical portion 83f extending horizontally from the lower portion of the peripheral surface of the body, an attachment leg portion 83j provided on the rear surface from the outer peripheral surface of the main body portion 83d, and a peripheral edge portion of the front end of the main body portion 83d. The flange part 83c mentioned above is extended. Female threaded holes are formed in the flange portion 83c. The screw 94 for fixing with the flange part 85d of the casing cover 85 is inserted into this female thread hole.

The upper cylindrical portion 83e forms a discharge port 72b of the drain pump 52.

The lower cylindrical part 83f forms the suction port 72a of the drain pump 52, and the pipe 56 mentioned above is connected. The inner bottom surface of the lower cylindrical portion 83f is located below the distance G (see Fig. 4) than the inner circumferential surface of the main body portion 83d. Therefore, since the suction port 72a is formed low with respect to the inner peripheral surface of the main-body part 83d, it can suck in water of a lower water level compared with the case where it is not formed low. Moreover, since the time until inhalation of air takes place can be lengthened when the water of low water level is inhaled, the efficiency fall of the drain pump 52 accompanying the inhalation of air can be prevented. Moreover, the same effect can be acquired even if the position of the pipe 56 connected to the suction port 72a with respect to the inner peripheral surface of the main-body part 83d is made low.

The attachment leg 83j includes an upright portion (not shown) extending rearward from the rear of the periphery of the main body portion 83d, the attachment member 83a extending in a direction orthogonal to the axial direction from the rear end of the upright portion, It is integrally formed with the main body part 83d by the rib 83b provided in the attachment member 83a.

The attachment member 83a extends radially outward rather than the outer peripheral part of the main-body part 83d, and the insertion hole 83i of the screw 93 for attaching the motor 90 is formed in the vicinity of the edge part. . The insertion through hole 83i is disposed at a position where polymerization can be avoided when viewed from the front of the flange portion 83c of the casing main body 83 and the flange portion 85d of the casing cover 85. Therefore, the screw 93 can be inserted into the insertion through hole 83i or the screwing operation can be easily performed without disturbing both flange portions. In addition, "view from the front" here is because the above-mentioned assembly direction of the pump apparatus 8 is made from the front which is the protruding direction of the rotating shaft 90a of the motor 90. In addition, the attachment member 83a is not limited to the avoidance of the superposition | polymerization with both flange parts, For example, even if the hole which can penetrate a screw and can operate a screw fastening tool is provided in both flange parts, Does not matter. In other words, the attachment member 83a is an inner space partitioned by a casing 80 to be described later composed of a casing body 83, a casing wall portion 84, and a casing cover 85, that is, a first flow path chamber 71 and a first chamber. The polymerization of the two flow path chambers 72 may be avoided.

Moreover, the attachment member 83a is formed so that it may not protrude in the height direction with respect to the flange part 83c of the casing main body 83, and the flange part 85d of the casing cover 85. As shown in FIG. The upper end of the attachment member 83a is lower than the upper end of both flange portions, and the lower end of the attachment member 83a is formed compactly by suppressing the height as the pump device 8 higher than the lower end of both flange portions.

The rib 83b is connected to the upright portion 83g, the outer circumferential surface of the main body portion 83d, and the rear surface of the flange portion 83c at the front surface near the insertion through hole 83i of the attachment member 83a. 83a) can be reinforced to prevent its deformation. The ribs 83b are provided in pairs on both sides of the attachment member 83a.

Thus, since the rib 83b can reinforce the attachment member 83a, even if the attachment member 83a is formed long in a cantilever shape in order to avoid superposition | polymerization with the internal space of the casing 80, the attachment member ( 83a) can be prevented. In particular, since the rib 83b is connected to the flange portion 83c and can directly reinforce the attachment member 83a and the casing cover 85, the first flow path chamber (to be described later) partitioned within the casing cover 85 ( The deformation of the attachment member 83a with respect to 71 can be reliably prevented.

Moreover, since the rib 83b can also reinforce the flange part 83c which is a boundary part of both flow path chambers, it is preferable. That is, when the pump device 8 is used in the dishwasher, the washing pump 51 is larger than the drain pump 52 for reasons such as use frequency. In such a case, it is because a step | step like the above-mentioned both flange part arises in the boundary part of both pumps, or the connection part of components is provided, and as a result, the strength of a boundary part tends to become weak.

The casing main body 83, the casing wall portion 84, and the casing cover 85 described above are combined with each other to function as one casing 80. In the casing 80, a first flow path chamber 71 rotatably accommodating the first impeller 81 and a second flow path chamber 72 rotatably accommodating the second impeller 82 are partitioned. . The second flow path chamber 72 is formed to have a smaller external appearance than the first flow path chamber. The flange part 85d of the casing cover 85, the flange part 83c of the casing main body 83, and the casing wall part 84 are located in the boundary part of both flow path chambers.

The first flow path chamber 71 is partitioned by the inner surface of the main body portion 85a of the casing cover 85 and the front surface of the casing wall portion 84. As shown in Fig. 5, the first flow path chamber 71 is formed in a spiral shape from the inlet port 71a at the center to the discharge port 71b at the outer circumference, and the first impeller 81 is disposed at the center thereof. have.

The first impeller 81 is a rotating impeller having a curved blade. When the first impeller 81 rotates, the blade can push water in the center portion to the outer circumferential side. The 1st impeller 81 comprises the washing | cleaning pump 51 with the 1st flow path chamber 71. As shown in FIG.

The washing pump 51 is a so-called centrifugal pump that sucks water from the center of the vortex and discharges it from the outer circumferential portion of the vortex. When the first impeller 81 rotates counterclockwise from the front as shown in Fig. 5, the water sucked from the suction port 71a can be moved to the outer circumferential side and discharged to the discharge port 71b.

The second impeller 82 is a rotating disc having a plurality of radial blades. When the second impeller 82 rotates, it is possible to move the water around the vortex by generating a circumference around the recess formed between the blades. The second impeller 82 has a fitting hole in the center thereof, and the rotation shaft 90a of the motor 90 is fixed thereto and is disposed at the center of the main body portion 83d of the casing main body 83.

The second flow path chamber 72 is partitioned into an inner surface of the main body portion 83d of the casing main body 83 and a rear surface of the casing wall portion 84. The second impeller 82 extends from the suction port 72a to the discharge port 72b along the outer circumference of the second impeller 82 (the left part of the rotating shaft 90a in FIG. 4). The water can be passed along with the rotation clockwise in FIG. A portion between them, that is, a flow passage from the suction port 72a to the discharge port 72b along the outer circumference of the second impeller 82, is formed so that its cross section gradually decreases. That is, the gap between the inner surface of the main body portion 83d and the outer peripheral surface of the second impeller 82 is smaller in the discharge port 72b side than in the suction port 72a side. Further, by the projection of the rear surface of the casing wall portion 84 at the discharge port 72b side portion (upper portion F in Fig. 4), the second impeller 82 is narrowly formed in the front-rear direction, which is a direction in which the rotation shaft extends. have. Moreover, the part divided into the inner peripheral surface of the main body part 83d of the casing main body 83 and the outer peripheral surface of the 2nd impeller 82, the part between the discharge port 72b and the suction port 72a (rotation shaft 90a of FIG. 4). In the right side), the gap is narrow so as not to distribute water.

The drain pump 52 is comprised by the 2nd flow path chamber 72 and the 2nd impeller 82, and is what is called a vortex type | mold pump which the impeller rotating in a flow path chamber moves the water around it. When the second impeller 82 rotates clockwise as seen from the front 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 as viewed from the front, water is sucked in from the upper discharge port 72b. The discharge port 72b is connected to the drain pipe 54 and does not function as a drain pump. Do not.

Thus, since the part of the 2nd flow path chamber 72 has a wide part in the inlet port 72a side, and the part F in particular in the discharge port 72b side part is narrow, in this part F, The water flowing by the two impellers 82 can be forced out of the discharge port 72b as a result of the flow velocity being increased. Therefore, in the dishwasher, since water passing through the drain pump 72 can be considered to be contaminated, it is preferable because contaminants can be prevented from adhering to the flow path.

Moreover, since the drain pump 52 which narrowed the channel of the 2nd flow path chamber 72 is made to improve the drainage capacity, without making the 2nd impeller 82 enlarge, the 2nd flow path at the time of the operation | movement of the washing pump 51 is carried out. Even if the second impeller 82 is driven while the seal 72 is in water, the load is not increased as compared with the case where the second impeller 82 is enlarged to increase the drainage capacity. Therefore, it is possible to prevent unnecessary load on the motor 90 when the cleaning pump 51 is operated, and as a result, it is possible to prevent the deterioration of the performance of the cleaning pump 51 and to secure the cleaning performance of the dishwasher. can do.

And since the 2nd flow path chamber 72 becomes narrow in the front-back direction by the part F, the drain pump 52 can send water more powerfully.

Moreover, since the 2nd flow path chamber 72 becomes narrow also in the radial direction of the 2nd impeller 82 in addition to the front-back direction at the discharge port 72b side part, the 2nd flow path chamber 72 is a direction through which water flows. Since it can narrow in two directions orthogonal to, it becomes narrower compared with the case where it narrows in one direction. As a result, the drain pump 52 can send water more powerfully.

Thus, according to this embodiment, as shown in FIG. 5, the motor 90 is attached to the attachment member 83a by arrange | positioning, avoiding the attachment member 83a of the casing 80 from superposing | polymerizing with both flow path chambers. At this time, the casing 80 can be prevented from being disturbed. As a result, fixing work such as screwing of the attaching member 83a and the attaching anvil 91 attached to the motor 90 can be performed from the front side in the casing 80 side, and thus, workability at the time of assembly is excellent. . For example, since the assembly direction of the pump device 8 can be one direction from the casing 80 side which becomes the assembly direction of each impeller, the direction of semi-assemblies, such as a pump and a motor, is reversed in the middle of assembly. You don't have to. In addition, the motor 90 is usually heavier than the pump device 8. Accordingly, the pump device 8 can be assembled while the heavy motor 90 is fixedly installed.

By the way, when the attachment member 83a is deformed, it is necessary to set a large gap between both the impellers connected to the motor 90 attached to the attachment member 83a and the casing 80 to prevent them from colliding with each other. As a result, the efficiency of each pump cannot be increased. On the other hand, in the present invention in which the ribs 83b can prevent the deformation of the attachment member 83a, the gap between each impeller and the casing 80 does not have to be increased, so that the efficiency of each pump can be improved.

In the cleaning pump 51, the first flow path chamber 71 is located farther from the motor 90 than the drain pump 52, and the first impeller 81 is supported at the free end side of the cantilever state. Therefore, there exists a tendency for the assembly precision with respect to the 1st flow path chamber 71 to fall. In the cleaning pump 51 as described above, the present invention which can prevent the deformation of the attachment member 83a to the first flow path chamber 71 by the rib 83b allows the first impeller to pass through the attachment member 83a. The assembly precision of the 81 and the 1st flow path chamber 71 can be made high, and the efficiency of the washing pump 51 can be improved.

In addition, the attachment anvil 91 and the attachment member 83a do not protrude from the outer shape of both flange portions of the motor 90, the casing main body 83, or the casing cover 85 as viewed from the side. Therefore, even if the attachment member 83a etc. are arrange | positioned avoiding superposition | polymerization with a flow path chamber, the height of the pump apparatus 8 can be suppressed and the washing machine 1 can be made small.

In addition, although the pump apparatus 8 is equipped with the motor 90 as the drive apparatus, it is not limited to this. For example, the second impeller 82 may be rotatably supported by the bearing by the casing 80 and connected to the rotating shaft 90a via a coupling. In other words, the first pump corresponding to the cleaning pump 51 and the second pump corresponding to the drain pump 52 may be disposed adjacent to each other and driven by a single drive device.

In addition, it is possible to perform various design changes in the range which does not change the summary of this invention.

According to the invention according to claim 1, the following effects can be obtained. That is, since the channel of the second flow path chamber has a smaller discharge port side portion than the suction port side portion, the water flowing in the discharge port side portion can flow out of the discharge port strongly as a result of the flow velocity being increased. Moreover, since the 2nd pump which narrowed the channel of the 2nd flow path chamber improves the drainage capacity, even if it does not enlarge a 2nd impeller, while a 2nd impeller has water in the 2nd flow path chamber at the time of operation of a 1st pump, Even if it drives, it will not become a load compared with the case where the 2nd impeller is enlarged and a drainage capacity is improved. Therefore, it is possible to prevent unnecessary load on the drive device during the operation of the first pump.

According to the invention according to claim 2, in addition to the effect of the invention according to claim 1, since the direction of the rotation axis is narrow, the water can be more efficiently delivered.

According to the invention according to claim 3, in addition to the effect of the invention according to claim 2, the second flow path chamber is narrowed in two directions orthogonal to the direction in which water flows, and can be further narrowed. We can send water well.

According to the invention according to claim 4, in addition to the effect of the invention according to claim 1, the attachment member is disposed to avoid polymerization with the flow path chamber, so that the fixing operation such as screwing when attaching the driving device to the attachment member is casing. Since it can carry out from a lateral direction, the workability at the time of assembling is excellent.

According to the invention of claim 5, in addition to the effect of the invention of claim 4, the attachment member can be reinforced with a rib, so that deformation of the attachment member can be prevented. In particular, the rib directly connecting the attachment member and the first flow path chamber can reliably prevent deformation of the attachment member to the first flow path chamber. The rib is also preferable because it can also reinforce the boundary portion.

Claims (5)

A casing for partitioning the first flow path chamber and the second flow path chamber adjacent to the first flow path chamber, a first impeller rotatably installed in the first flow path chamber, and coaxially connected to the first impeller to be rotatable in the second flow path chamber. A first pump is formed by the first flow chamber and the first impeller, and a second pump is formed by the second flow chamber and the second impeller, and the first impeller and the second impeller are driven. In the pump device is attached to the casing, the pump device to switch the operation of both pumps by switching the rotation direction of both impeller, The second flow chamber chamber has a suction port and a discharge port formed on its peripheral surface, and a discharge port side portion is formed narrowly in accordance with a direction in which water flows from the suction port to the discharge port. The pump apparatus according to claim 1, wherein the second flow path chamber is narrowed in a direction parallel to the axis of rotation of the second impeller. The pump apparatus according to claim 2, wherein the second flow path chamber is further narrowed in the radial direction of the second impeller. The casing according to claim 1, wherein the casing is divided into smaller passages than the first passage chamber, and both passages are viewed in a direction parallel to the rotation axis of the second impeller for attaching the driving device to the second passage chamber side. A pump device comprising a seal and an attachment member arranged to avoid polymerization. The pump device according to claim 4, wherein the casing further includes a rib connected to the attachment member from the boundary portion of the two flow path chambers.