JPH1043121A - Pump for dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely close one discharge port while the other discharge port is opened by incorporating modifications to a switching valve device in a pump for dishwasher for which a washing water discharge port and a dirty water discharge port are installed on one pump, the switching valve device is operated corresponding to the forward/backward turn of the pump and water is respectively discharged from the washing water discharge port and the dirty water discharge port. SOLUTION: A switching valve device 15, with which water is discharged from any one of washing water discharge port 12 and dirty water discharge port 14 corresponding to the forward/backward turn of a motor 5, is composed of a valve plate 4 for selectively opening either the washing water discharge port 12 or the dirty water discharge port 14 and on both the faces of a pressure receiving rib 16 of this valve plate 4, a forward turning flow pressure receiving plane 19 and a backward turning flow pressure receiving plane 21 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher pump.

[0002]

2. Description of the Related Art A dishwasher pump has a function of spraying washing water from a spray nozzle when washing dishes, and a function of discharging sewage after washing to the outside of the machine. In the past, it was common to separately provide a pump for injecting washing water and a pump for discharging sewage, but in order to reduce the size of the device,
It is also known that a single pump is used to switch between an injection passage and a drain passage by a valve driven by an electromagnetic solenoid in accordance with switching between normal rotation and reverse rotation.
145364, JP-B 8-15477).

[0003] Further, there is also known an apparatus in which an electromagnetic solenoid for driving the above-mentioned switching valve is omitted, and a movable valve is operated by a change in water flow and water pressure when the pump rotates forward and backward (actually disclosed in Japanese Utility Model Application Laid-Open No. HEI 1-1991). -108264, Japanese Utility Model Laid-Open 1-121
553).

[0004]

As described above, in the type in which the movable valve is actuated by a change in the water flow and the water pressure when the pump rotates forward and backward, the electromagnetic solenoid for driving the movable valve and its control device are used. Since it is unnecessary, there are advantages of low cost and downsizing.

[0005] However, in all of the above publications, a movable valve is provided only at the sewage discharge port.
When the pump is reversed to discharge sewage from the sewage discharge port, the cleaning water discharge port is not closed but remains open, so that the cleaning water is discharged somewhat if not as much as in the normal rotation, There is an inconvenience of wetting dishes that have already been washed.

Further, since the movable valve is simply mounted so as to be swingable by a hinge, a float provided on the movable valve (in the case of Japanese Utility Model Laid-Open No. 1-112553) and a resistance wall are provided. (In the case of Japanese Utility Model Laid-Open No. 1-108264), the movable valve vibrates due to the turbulent flow caused by the water flow,
There are also problems with incomplete closure.

In view of the above, the present invention provides a dishwasher pump in which the discharge of sewage is surely stopped when the wash water is injected, and the discharge of the wash water is surely stopped when the sewage is discharged. The purpose is to provide.

[0008]

In order to achieve the above object, the present invention provides a pump casing having a washing water discharge port, a sewage discharge port, and a common suction port for both of these discharge ports. In a dishwasher pump provided with a switching valve device that discharges water from one of the washing water discharge port and the sewage discharge port in accordance with inversion / reversal, the switching valve device is provided with the washing water discharge port and the sewage The discharge port is configured by a valve that selectively opens and closes, and the valve is provided with a forward flow receiving surface and a reverse flow receiving surface that receive a water flow at the time of forward rotation and reverse rotation of the motor. Item 1).

In the forward rotation of the pump, the forward rotation pressure receiving surface provided on the valve is pressed by the forward rotation flow to operate, closing one of the washing water discharge port and the sewage discharge port. Release the other. When the pump rotates reversely, the operation reverse to the above is performed.

In the above basic configuration, the washing water discharge port and the sewage discharge port are formed on the same arc surface of the inner peripheral surface of the casing, and the valve is formed by an arc-shaped valve plate that slides along the arc surface. It is possible to adopt a configuration in which a pressure receiving rib protruding inwardly of the casing is formed on the valve plate.

In this case, one surface of the pressure receiving rib provided on the valve plate serves as a forward flow pressure receiving surface, and the other surface serves as a reverse flow pressure receiving surface.
The flow acts on any one of these pressure receiving surfaces to slide the valve plate to selectively open and close the wash water discharge port and the sewage discharge port.

In the above basic configuration, the casing has an inner circumferential surface between the washing water discharge port and the sewage discharge port having a circumferential length equal to a stroke of a valve plate, and one end having the same length as the sewage discharge port. Where the auxiliary valve attached to the back of the valve plate is housed in the recess, and when the valve plate fully opens the wash water discharge port, the auxiliary valve closes the dirty water discharge port. A configuration in which the auxiliary valve or the like is attached to the second embodiment can be adopted (claim 3).

In this case, an auxiliary valve is provided in addition to the valve plate, and the auxiliary valve closes the sewage discharge port, so that the sewage discharge port can be reliably closed.

Further, in the above basic configuration, the valve is constituted by two independent valve plates for opening and closing the washing water discharge port and the sewage discharge port, respectively. The wash water discharge port and the sewage discharge port are rotatably mounted on the peripheral wall of the pump casing between discharge ports, and are respectively opened and closed by outward rotation. A structure in which the springs are connected by a link so as to operate while maintaining the positional relationship of degrees, and an urging spring is attached between an intermediate point between the wash water discharge port and the sewage discharge port of the pump casing and an intermediate point of the link. (Claim 4).

In this case, the inner surfaces of the respective valve plates provided at the washing water discharge port and the sewage discharge port serve as a forward rotation pressure receiving surface and a reverse rotation pressure receiving surface, respectively. Ensures an alternative opening and closing action.

In the above basic structure, the washing water discharge port is provided on an arc-shaped peripheral wall formed in the pump casing, and the sewage discharge port is provided on a bottom surface of the pump casing surrounded by the arc-shaped peripheral wall. The valve comprises a fan-shaped box-shaped valve body composed of an arc-shaped side surface and both end surfaces and a bottom surface sliding on the inner surface of the arc-shaped peripheral wall, and a ball-shaped valve body housed in a valve chamber on the bottom surface, A required portion of the box-shaped valve body is rotatably mounted on the center of curvature of the arc-shaped peripheral wall, and a bottom hole in which the ball-shaped valve body falls into the bottom surface of the valve chamber. When the valve body opens the washing water discharge port, the bottom hole is set at a position corresponding to the sewage discharge port, and the sewage discharge port is closed by a ball-shaped valve body that has fallen into the bottom hole. (Claim 5).

In this case, both side surfaces of the fan-shaped box-shaped valve element serve as a forward flow receiving pressure surface and a reverse flow receiving pressure surface, and the spherical valve element closes the sewage discharge port with the cleaning water discharge port opened. As a result, the discharge of sewage is reliably shut off.

By the way, the pump having the above-mentioned basic structure is as follows.
Although the switching valve device is provided at the cleaning water discharge port and the sewage discharge port in the pump casing, a configuration in which the switching valve device is provided outside the pump casing can be adopted.

In this case, the pump casing is provided with a washing water discharge port, a sewage discharge port, and a common suction port for both of these discharge ports, and the washing water discharge port or the sewage discharge port is provided depending on whether the motor rotates normally or reversely. In a dishwasher pump that discharges water with a pressure difference from the above, the inside of the auxiliary casing connected to the wash water discharge port and the sewage discharge port is partitioned into a wash water chamber and a sewage chamber by a partition wall, and the partition wall is The cleaning water chamber is formed of a deformable member deformed by a pressure difference between the cleaning water chamber and the cleaning water chamber, and the cleaning water chamber is provided with a cleaning water inlet and a cleaning water outlet communicating with the cleaning water discharge port. A sewage inlet and a sewage outlet connected to the outlet are provided, and the washing water outlet and the sewage outlet are provided opposite to each other on both sides of the partition wall. Close either one To adopt a configuration which is adapted to (claim 6).

According to the above configuration, the pressure of the washing water chamber of the auxiliary valve casing becomes higher than the pressure of the sewage chamber at the time of normal rotation, and the partition wall is deformed toward the sewage chamber, thereby closing the sewage outlet. At the time of reverse rotation, the pressure in the sewage chamber becomes higher than the pressure in the rinsing water chamber, and the partition wall is deformed to the rinsing water side, thereby closing the rinsing water discharge port.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dishwasher pump according to a first embodiment shown in FIGS. 1 to 3 comprises a casing body 1, a lid 2, an impeller 3, a valve plate 4, and a motor 5.

The casing body 1 is formed in a cylindrical shape with one side open, and a lid 2 is attached to the open part. A suction port 6 is provided at the center of the lid 2. A rotating shaft 7 of the motor 5 is penetrated through the center of the casing body 1 while maintaining watertightness, and the impeller 3 is attached to the rotating shaft 7. The impeller 3 is provided with a boss 9 at the center of the disk 8, and a required number of guide vanes 1 integrated with the disk 8 on the outer peripheral surface of the boss 9.
1, a centrifugal pump is constituted by the impeller 3. The rotation direction of the impeller 3 is shown in FIG.
The direction of the arrow A (the direction of guiding water to the outer periphery of the impeller 3) in FIG.

A washing water discharge port 12 is provided on the peripheral wall of the casing main body 1 in a tangential direction, and is located at a position away from the cleaning water discharge port 12 with a peripheral wall portion 13 at a fixed distance in the forward rotation direction. A sewage discharge port 14 which is parallel to the wash water discharge port 12 and has a slightly smaller diameter is provided.

The washing water discharge port 12, the peripheral wall portion 13, and the sewage discharge port 14 are formed on an arc-shaped peripheral wall having the rotation shaft 7 as a center of curvature, and a switching valve device 15 is provided on the inner surface of the peripheral wall. Is provided.

The switching valve device 15 comprises a valve plate 4, a pressure receiving rib 16 provided on the valve plate 4, and guide grooves 17, 17 'for slidably fitting the valve plate 4. The valve plate 4 is formed in an arc shape along the inner surface of the peripheral wall. The guide grooves 17 and 17 ′ are provided on the bottom surface of the casing body 1 along the peripheral wall and the inner surface of the lid 2 opposed thereto, and guide ribs 18 provided on the upper and lower end surfaces of the valve plate 4 are provided with the guide grooves 17 and 17 ′. , 17 '.

The valve plate 4 has a width extending over the washing water discharge port 12 and the peripheral wall portion 13 adjacent thereto, and the width of the peripheral wall portion 1.
3 has a width equal to the larger of the widths extending from the sewage discharge port 14 adjacent thereto to the sewage discharge port 14, and as shown in FIG.
If the sewage discharge port 14 is tightly closed and closed,
The cleaning water discharge port 12 is opened. Conversely, the washing water outlet 12
Is closed, the wastewater discharge port 14 is opened. That is, the valve plate 4 is provided with the washing water discharge port 12 and the sewage discharge port 14.
Is opened and closed alternatively.

On one side edge of the valve plate 4, a pressure receiving rib 16 in a direction parallel to the rotation shaft 7 is provided so as to project inward. One side surface of the pressure receiving rib 16 is a surface for receiving the pressure of the flow when the pump rotates forward, that is, a forward rotation pressure receiving surface 19 (FIG. 2).
(See (c)), the other surface is the reverse flow pressure receiving surface 21.

When the water pressure due to the forward flow acts on the forward flow receiving surface 19, the valve plate 4 closes the sewage discharge port 14 as shown by the solid line in FIG. When the water pressure due to the reverse flow acts on the washing water, the washing water discharge port 12 is closed by sliding as shown by a two-dot chain line.

The pump 2 of the first embodiment having the above configuration
3 is used in a dishwasher 23, as shown in FIG. 3, connects the suction port 6 of the casing body 1 to a water tank 24, connects the cleaning water discharge port 12 to a cleaning nozzle group 25, and further connects the sewage discharge port 14 to the cleaning nozzle group 25. Is connected to the drain 26.

When washing dishes, water is supplied from outside to the water tank 24, and the pump 22 is rotated forward. Then, the water pressure acts on the forward rotation pressure receiving surface 19 of the valve plate 4, thereby moving the valve plate 4, opening the washing water discharge port 12 and closing the sewage discharge port 14. Water is sprayed from the washing nozzle group 25 toward the tableware to wash the tableware.

When the washing is completed, the pump 22 is reversed. Then, water pressure acts on the reverse flow pressure receiving surface 21 to move the valve plate 4, thereby opening the dirty water discharge port 14 and closing the wash water discharge port 12. As a result, the waste water after the cleaning is discharged from the drain port 26 to the outside of the machine.

The second embodiment shown in FIGS. 4 and 5 is basically the same as the first embodiment. The difference is that the sewage discharge port 14 is provided so as to be 90 degrees different from the wash water discharge port 12, and the inner surface of the peripheral wall portion 13 between the wash water discharge port 12 and the sewage discharge port 14. A point where a recess 27 is provided, a point where a ball-shaped auxiliary valve 28 is provided on the back surface of the valve plate 4, and two pressure receiving ribs 16, 1 and 2 on both side edges of the valve plate 4.
6 'is provided. These two pressure receiving ribs 16,
16 ′ are provided with forward flow receiving surfaces 19 and 19 ′ and reverse flow receiving surfaces 21 and 21 ′, respectively.

As shown in FIG. 5 (a), the auxiliary valve 28 has a positional relationship of closing the sewage discharge port 14 when the valve plate 4 fully opens the wash water discharge port 12. When the sliding water outlet 12 is closed by sliding, the auxiliary valve 28
Moves to one end of the recess 27.

The pump according to the second embodiment is as described above. Since the sewage discharge port 14 is closed by the auxiliary valve 28, the auxiliary valve 28 having a good sealing property such as a ball valve is used. By making a selection, the sewage discharge port 14 can be closed more reliably during cleaning.

In the third embodiment shown in FIGS. 6 and 7, the casing body 1 has a shape in which the peripheral wall 29 is formed by integrally connecting the open end of the semicircular portion and the open end of the rectangular portion. , A bottom wall 31 and an end wall 32 are provided, and the impeller 3 is disposed at a center of curvature of a semicircular portion.
Is connected to the rotating shaft 7 of the motor 5 which penetrates through.

A washing water discharge port 12 is provided along one side wall 29a of the rectangular portion and extending tangentially to the normal rotation direction of the impeller 3, and a sewage discharge port is provided along the other side wall 29b in parallel therewith. An outlet 14 is provided.

The above-mentioned washing water discharge port 12 and sewage discharge port 14
The inner wall of the peripheral wall portion 13 forms an arcuate surface along the outer periphery of the impeller 3, and the wall portions 33, 33 formed at both ends thereof are outwardly facing the cleaning water discharge port 12 and the sewage water. An inner wall of the discharge port 14 is formed.

Washing water valve plates 34 and sewage valve plates 35 are attached to the outer ends of the wall portions 33, 33, respectively, by hinges 36, 3 respectively.
7, the valve seats 38, 39 opposed to the respective valve plates 34, 35 have both side walls 29a, 2
9b.

A washing water connection port 41 facing the washing water discharge port 12 and a sewage connection port 42 facing the sewage discharge port 14 are provided on the end wall 32 of the rectangular portion of the casing body 1.
In addition, on both side surfaces of the end wall 32 between these two connection ports 41, 42, rest seats 43, 44 when the respective valve plates 34, 35 are opened are provided.

Each valve plate 34, 35 has its hinge 36, 3
7, the valve seats 38, 39
, The cleaning water discharge port 12 and the dirt discharge port 14 are closed, respectively, and are returned to the rest seats 43 and 44 to be opened. That is, each valve plate 34, 35 is provided with a valve seat 38, 3
It rotates in a range of 90 degrees outward from 9.

Both ends of a link 45 are rotatably mounted between the rear surfaces of the valve plates 34 and 35. The link 45 is set to a length that allows the one valve plate 34 and the other valve plate 35 to always maintain a 90-degree positional relationship.

The wall portions 3 at both ends of the peripheral wall portion 13
A pin 46 is provided on the bottom wall 31 of the casing main body 1 at an intermediate portion between the pin 46 and the link 45.
A tension type coil spring 47 is attached to an intermediate portion of the coil spring. As shown by the solid line in FIG. 7A, when the washing water valve plate 34 is opened and the sewage valve plate 35 is closed, the link 45 is deviated to the sewage valve plate 35 side. The spring 47 is also inclined in that direction, and the sewage valve plate 35 is pressed by the valve seat 39 by the spring force of the coil spring 47 to close the sewage discharge port 14. On the other hand, the washing water valve plate 3
4 is pressed by the rest seat 43 to open the washing water discharge port 12. The operation of the link 45 and the coil spring 47 is the same even when the opening and closing relationship of the valve plates 34 and 35 is reversed (see the two-dot chain line in FIG. 7A).

Incidentally, the spring force of the coil spring 47 causes the forward rotation flow by the impeller 3 to be directed to the inner surface of the flush water valve plate 34,
That is, when the valve plate 34 is opened and the valve plate 35 is closed when the reverse flow is received by the forward flow receiving surface 48, and when the reverse flow is received by the reverse flow receiving surface 49 on the inner side of the sewage valve plate 35. The valve plate 3
5 is set to such a size that the valve plate 34 is opened and the valve plate 34 is closed. In addition, the structure of the impeller 3 and the structure of the suction port 6 are the same as those described above.

The pump of the third embodiment is as described above. When the pump rotates in the forward direction, the flush water valve plate 34 is opened by the pressure of the forward flow, and the sewage valve plate 35 is linked with the link 45. Are closed (see the solid line in FIG. 7A).
Further, when the pump reversely rotates, the sewage valve plate 35 is opened and the flush water valve plate 34 is closed by the action opposite to the disturbance (see the two-dot chain line in FIG. 7A).

Next, in the fourth embodiment shown in FIGS. 8 and 9, the vertical positional relationship is limited. That is, the casing main body 1 is formed by forming the opposing semicircular peripheral wall portions 51, 51 'of the same size facing each other into parallel side walls 5 having a length approximately equal to the radius thereof.
It is an oval shape connected by 2, 52 ', has a top plate 54, the lower surface facing the top plate 54 is opened, and a lid 53 is attached to the opened lower surface.

The impeller 3 is arranged at the center of curvature of one semicircular peripheral wall portion 51 of the casing body 1,
The rotation shaft 7 of the motor 5 penetrating through 4 is connected to this.
In addition, a suction port 6 is provided in a portion of the lid 53 facing the impeller 3.

The cleaning water discharge port 1 protrudes from the other semicircular peripheral wall portion 51 'in the tangential direction of the forward rotation direction of the impeller 3.
2 are provided.

The portion of the lid 53 covering the other semicircular peripheral wall portion 51 ′ is displaced toward the other side wall 52 side,
A sewage discharge port 14 having a smaller diameter than the aforementioned wash water discharge port 12 is provided.

A sector-shaped box-shaped valve element 5 is provided at the center of curvature of the other semicircular peripheral wall portion 51 'of the casing body 1.
The essential part 5 is rotatably attached to the top plate 54 and the lid 53 by pins 56.

The box-shaped valve element 55 has a fan-shaped bottom plate 57.
And an arcuate side surface 58 sliding along the peripheral wall portion 51 '.
The bottom plate 57 is provided with a bottom hole 61 corresponding to the sewage discharge port 14, and a valve chamber 62 surrounding the bottom hole 61 is provided. A ball-shaped valve body 63 is housed in the valve chamber 62, and when the bottom hole 61 matches the sewage discharge port 14, the ball-shaped valve body 63 is
And the sewage discharge port 14 is closed.

As described above, the box-shaped valve element 55 opens the washing water discharge port 12 in a state where the ball-shaped valve element 63 falls into the bottom hole 61 and closes the sewage water discharge port 14. When it rotates from the angle θ (see FIG. 9A), the cleaning water discharge port 12 is closed at the arc-shaped side surface 58, the ball valve body 63 is moved, and the dirty water discharge port 14 is opened.

Now, as shown in FIG. 9 (a), when the pump is rotated forward, the forward flow presses one end face 59 of the box-shaped valve element 55 to open the washing water discharge port 12, and The ball-shaped valve body 63 falls into the bottom hole 61 and closes the sewage discharge port 14. In this case, the end face 59 of the box-shaped valve element 55 serves as a forward rotation pressure receiving face.

When the pump is reversed, the reverse flow acts on the other end face 59 ', causing the box-shaped valve body 55 to move as shown in FIG.
By moving to the state indicated by the two-dot chain line in FIG.
4 is opened, and the washing water discharge port 12 is closed. In this case, the end face 59 'of the box-shaped valve element 55 becomes the reverse flow pressure receiving face.

Next, FIG. 10A shows a fifth embodiment, and FIG. 10B shows a sixth embodiment. In each of the first to fourth embodiments, the switching valve device is provided inside the casing,
Although the washing water discharge port 12 and the sewage discharge port 14 are selectively opened and closed, the fifth and sixth embodiments have
Without providing the switching valve device as described above in the casing 65 of the pump 64, the impeller 66 that can simply rotate forward and reverse
And a cleaning water discharge port 67 and a sewage discharge port 68 are provided.

In the case of the fifth and sixth embodiments, an auxiliary casing 69 is provided separately from the casing 65, and the inside thereof is partitioned into a washing water chamber 72 and a sewage chamber 73 by a partition wall 71. A cleaning water inlet 74 is provided on the side of the cleaning water chamber 72, a sewage inlet 75 is provided on the side of the sewage chamber 73, and a cleaning water outlet 76 is provided on the surface of the cleaning water chamber 72 facing the central portion of the partition wall 71. Similarly, a sewage outlet 77 is provided on a surface of the sewage chamber 73 facing the central portion of the partition wall 71.

In the case of the fifth embodiment shown in FIG. 10A, the partition 71 is provided with a flexible thin film bag 8 made of plastic rubber or the like in a hole 79 at the center of a flexible thin plate 78.
A variable member 83 in which a liquid 82 is sealed is mounted in one.

The variable member 83 is deformed by a pressure difference between the washing water chamber 72 and the sewage chamber 73, and closes one of the washing water outlet 76 and the sewage outlet 77 and opens the other. That is, they are selectively opened and closed.

In the case of the sixth embodiment shown in FIG. 10B, the partition 71 itself is formed by a variable member 83 'made of a flexible thin film such as plastic rubber or the like. The cleaning water outlet 76
And the sewage outlet 77 is selectively opened and closed.

The fifth and sixth embodiments are as described above. When the pump 64 is rotated forward, the flow discharged from the washing water discharge port 67 is smaller than the flow discharged from the sewage discharge port 68. Since the pressure is higher, the auxiliary casing 69
Inside, the pressure of the washing water chamber 72 becomes higher than that of the sewage chamber 73, and the variable members 83 and 83 ′ are deformed toward the sewage chamber 73 as shown by a two-dot chain line, and the sewage outlet 77 is closed.

When the pump 64 is rotated in the reverse direction, the pressure relationship is reversed, and the variable members 83 and 83 'close the washing water outlet 76.

FIG. 11 shows one pump 84 as a comparative example.
And a switching valve device 86 provided at the discharge port 85 thereof. In the switching valve device 86 in this case, a ball valve 88 is housed inside a valve case 87, and a wash water discharge port 89 and a sewage discharge port 91 are provided by a T-shaped passage provided in the ball valve 88.
Is switched. By precisely finishing the ball valve 88 and the inner surface of the valve case 87, there is an advantage that sealing can be achieved without using a sealing member, but an electromagnetic solenoid is required to rotate the ball valve 88. Become.

[0062]

As described above, according to the first to fifth aspects of the present invention, a forward flow pressure receiving surface and a reverse flow pressure receiving surface are provided on the valve plate of the switching valve device, and the flush water discharge port is formed by the valve plate. Since the sewage discharge port is selectively opened and closed, there is an effect that when discharging from one discharge port, the other discharge port is securely closed.

According to the sixth aspect of the present invention, the discharge of the washing water and the discharge of the sewage can be switched without providing a switching valve device inside the pump and without using an actuator such as an electromagnetic solenoid.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a first embodiment.

2A is a longitudinal sectional view of the same, FIG. 2B is a transverse sectional view of the same, and FIG.

FIG. 3 is a schematic view of a use state of the above.

FIG. 4 is an exploded perspective view of the second embodiment.

FIG. 5 (a) is a cross-sectional plan view of the same, and (b) is a partially omitted enlarged cross-sectional view of the same.

FIG. 6 is an exploded perspective view of the third embodiment.

FIG. 7A is a cross-sectional plan view of the same, and FIG.

FIG. 8 is an exploded perspective view of the fourth embodiment.

9A is a cross-sectional bottom view of the above-mentioned embodiment, and FIG.

10A is a sectional view of a fifth embodiment, and FIG. 10B is a sectional view of a sixth embodiment.

11A is a cross-sectional view of a comparative example. FIG. 11B is a cross-sectional view taken along line bb in FIG. 11A. FIG. 11C is a cross-sectional view taken along line cc in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing main body 2 Lid 3 Impeller 4 Valve plate 5 Motor 6 Suction port 7 Rotating shaft 8 Disk 9 Boss 11 Guide vane 12 Wash water discharge port 13 Peripheral wall part 14 Sewage discharge port 15 Switching valve device 16, 16 'Pressure receiving rib 17, 17 'guide groove 18 guide rib 19, 19' forward flow receiving surface 21, 21 'reverse flow receiving surface 22 pump 23 dishwasher 24 water tank 25 washing nozzle group 26 drain outlet 27 recess 28 auxiliary valve 29 peripheral wall 29a, 29b side wall 31 bottom wall 32 end wall 33 wall 34 flush water valve plate 35 sewage valve plate 36, 37 hinge 38, 39 valve seat 41 flush water connection port 42 sewage connection port 43, 44 rest seat 45 link 46 pin 47 coil spring 48 correct Commutation pressure receiving surface 49 Reverse commutation pressure receiving surface 51, 51 ′ Peripheral wall portion 52, 52 ′ Side wall 53 Cover 54 Top plate 55 Box-shaped valve body 56 Pin 57 Bottom plate 58 Arc-shaped side surface 59, 59 'End surface 61 Bottom hole 62 Valve chamber 63 Globe valve body 64 Pump 65 Casing 66 Impeller 67 Wash water discharge port 68 Waste water discharge port 69 Auxiliary casing 71 Partition wall 72 Cleaning water chamber 73 Waste water chamber 74 Wash water inlet 75 Sewage inlet 76 Wash water outlet 77 Sewage outlet 78 Thin plate 79 Hole 81 Bag 82 Liquid 83, 83 'Variable member 84 Pump 85 Outlet 86 Switching valve device 87 Valve case 88 Ball valve 89 Wash water outlet 91 Sewage spout Exit

Claims (6)

[Claims] A pump casing provided with a washing water discharge port, a sewage discharge port, and a common suction port for both of these discharge ports;
In a dishwasher pump provided with a switching device that discharges water from one of the washing water discharge port and the sewage discharge port according to the forward rotation and reverse rotation of the motor, the switching valve device,
The cleaning water discharge port and the sewage discharge port are selectively opened and closed by a valve, and the valve is provided with a forward flow receiving pressure surface and a reverse flow receiving pressure surface for receiving the water flow at the time of forward rotation and reverse rotation of the motor. A dishwasher pump characterized by the following: 2. The cleaning water discharge port and the sewage discharge port are formed on the same arc surface of the casing inner peripheral surface, and the valve is formed by an arc-shaped valve plate that slides along the arc surface.
2. The dishwasher pump according to claim 1, wherein a pressure receiving rib protruding inward of the casing is formed on the valve plate. 3. A recess having a circumferential length equal to a stroke of a valve plate and having one end reaching the sewage discharge port on an inner peripheral surface of the casing between the wash water discharge port and the sewage discharge port. The auxiliary valve mounted on the back of the valve plate is housed in the recess, and the auxiliary valve is mounted at a position where the auxiliary valve closes the sewage discharge port when the valve plate fully opens the wash water discharge port. 3. The dishwasher pump according to claim 2, wherein: 4. The valve is constituted by two independent valve plates for opening and closing the wash water discharge port and the sewage discharge port, respectively.
Each of the valve plates is rotatably mounted on the peripheral wall of the pump casing between the wash water discharge port and the sewage discharge port, and the wash water discharge port and the sewage discharge port are respectively opened and closed by outward rotation. The rear surfaces of the valve plates are connected by a link so that each valve plate operates while maintaining a positional relationship of 90 degrees,
2. The dishwasher pump according to claim 1, wherein an urging spring is mounted between an intermediate point between the washing water discharge port and the sewage discharge port of the pump casing and an intermediate point of the link. 5. The cleaning water discharge port is provided on an arc-shaped peripheral wall formed in the pump casing, the sewage discharge port is provided on a bottom surface of the pump casing surrounded by the arc-shaped peripheral wall, and the valve is connected to the arc-shaped. A fan-shaped box-shaped valve body composed of an arc-shaped side surface sliding on the inner surface of the peripheral wall, both end surfaces, and a bottom surface, and a ball-shaped valve body housed in a valve chamber on the bottom surface thereof, The essential part is rotatably attached to the center of curvature of the arc-shaped peripheral wall, a bottom hole is provided in the bottom surface of the valve chamber where the ball-shaped valve element falls, and the position of the valve chamber is adjusted by the box-shaped valve element by the washing water. 2. The method according to claim 1, wherein when the discharge port is opened, the bottom hole is set at a position corresponding to the sewage discharge port, and the sewage discharge port is closed by a ball-shaped valve body that has fallen into the bottom hole. A dishwasher pump as described. 6. A pump casing having a washing water discharge port, a sewage discharge port, and a common suction port for both of these discharge ports,
In a dishwasher pump for discharging water having a pressure difference from the washing water discharge port or the sewage discharge port in accordance with the forward or reverse rotation of the motor, the auxiliary casing connected to the wash water discharge port and the sewage discharge port, respectively. The inside is divided into a washing water chamber and a sewage chamber by a partition, and the partition is formed by a deformable member deformed by a pressure difference between the washing water chamber and the sewage chamber, and the washing water chamber is connected to the washing water discharge port. Provide a washing water inlet and a washing water outlet, provide a sewage inlet and a sewage outlet that communicate with the sewage discharge port in the sewage chamber, and provide the rinsing water outlet and the sewage outlet opposite to each other on both sides of the partition wall. A dishwasher pump, wherein one of the washing water outlet and the sewage outlet is closed by deformation of the partition wall due to a pressure difference.