JPH11128145A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent flow to a diversion channel from being impeded by simplifying a structure. SOLUTION: In this dishwasher 1, drain hoses 54, 55 are connected to the drain port 72b of a washing/draining pump 8, and a check valve 56 is provided in a part where the flow of water drained by each hose goes upward. The check valve 56 prevents the water from flowing back toward the pump 8 and prevents dragging of air into the pump 8. The check valve 56 has a valve element 63a whose fulcrum of turning movement is located at a support part 63b. A hole 62a is provided in the opposite side of the support part 63b across a drainage, and on the downstream side immediately behind the check valve 56. From there the water passes through a diversion channel and flows to the level detection chamber 41 of a level detection switch 40. The water is prevented from collecting in the drain hose 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing and rinsing dishes.

[0002]

2. Description of the Related Art Conventionally, a dishwasher has a washing pump composed of a vortex pump for washing and rinsing, and a drainage pump composed of a vortex pump for draining water. Some units use a cleaning and drainage pump configured in a unit. In the washing / draining pump, each impeller constituting each pump is 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, Japanese Utility Model Application Publication No. HEI 3-103). 46709).

[0003]

However, since the operation of both pumps is switched according to the direction of rotation of the motor, the impeller of the other pump rotates in the reverse direction during the operation of one pump, and consequently the other pump. May be driven to suck water from the outlet. For example, during the cleaning operation of the cleaning pump, the impeller of the drainage pump is rotated in the reverse direction, so that the drainage pump sucks water from the discharge port, so that air is sucked into the pump together with water, that is, so-called air biting occurs. There is. When this air bite occurs, noise may be generated from the pump unit.

Accordingly, an object of the present invention is to solve the above-mentioned technical problems and to provide a dishwasher provided with a washing and drainage pump having a quiet operation sound.

[0005]

According to a first aspect of the present invention, there is provided a dishwasher comprising: a washing operation for pumping up and spraying washing water stored in a washing chamber;
And in a dishwasher having a washing and draining pump capable of performing a draining operation of draining the washing water stored in the washing room through a predetermined drainage channel by switching the rotation direction, the drainage direction is determined in the drainage channel. A check valve for preventing the flow of washing water or the like in the reverse direction is provided.

[0006] In the case of the washing and draining pump, the washing water in the drainage channel flows in the direction opposite to the draining direction while the pump is performing the washing operation.
Air may flow into the pump through the drain and cause so-called air biting. According to the configuration described above, the flow of the washing water or the air in the drainage channel in the direction opposite to the drainage direction can be prevented by the check valve, so that the above-described air entrapment can be prevented. As a result, noise caused by air biting can be prevented.

According to a second aspect of the present invention, in the dishwasher according to the first aspect, the drainage channel includes a drainage hose connected to a drainage outlet of a washing and drainage pump, and the drainage hose is provided with a drainage hose. , Extending upward from the drain outlet,
It is bent in a substantially U-shape and extends downward, and a portion of the drain hose extending upward from the drain outlet is connected to a water level detection chamber provided for detecting the level of the cleaning water in the cleaning chamber. The diversion channel is branched, and the check valve is inserted near the drain hose branch where the diversion channel is branched, at an upstream position in the drain direction.

According to this configuration, the following operation is achieved in addition to the operation of the first aspect of the invention. That is, since there is a diversion channel, a part of the water flowing through the drain hose flows into the water level detection chamber through the diversion channel. The water level detection chamber is provided with a float for detecting the water level, and if the water flowing from the diversion channel is applied to the float, dirt and the like adhering to the float are washed away by the flowing water, and the float adheres to the residual vegetables and the like. Thus, a malfunction can be prevented.

Further, even if air may enter the drainage channel through the diversion channel, the check valve is provided at a position upstream of the drainage hose branching off from the diversion channel. As a result, it is possible to reliably prevent the air from flowing into the pump, so that it is possible to reliably prevent the air from being caught. Further, when the backflow of the water in the drainage channel is prevented by the check valve, the water flows into the water level detection chamber through the diversion channel, so that the float can be reliably washed. In addition, since the check valve is provided near the position where the diversion channel is branched, the water can reliably flow into the diversion channel, thereby preventing the water from being accumulated in the drain hose above the check valve. be able to.

According to a third aspect of the present invention, in the dishwasher according to the second aspect, the check valve is opened so as not to prevent water passing through the check valve from flowing to the diversion channel. It is characterized by having a configuration. According to this configuration, in addition to the operation of the invention described in claim 2, the check valve is opened so as not to prevent the water passing through the drainage hose from flowing to the diversion channel. This does not impair the flow of water to the diversion channel.

According to a fourth aspect of the present invention, in the dishwasher according to the third aspect, the check valve includes a valve body that opens and closes a drain passage by rotating about a rotation fulcrum. A hole is formed in the inner peripheral surface of the channel at a predetermined angle in the direction of the diversion channel, and a rotation fulcrum of the valve element is arranged on the inner peripheral surface of the drainage channel at an angular position opposite to the position where the hole is formed. Thus, a configuration that does not hinder the water flowing to the diversion channel is realized.

According to this configuration, the following operation is achieved in addition to the operation of the third aspect of the invention. That is, it is possible to easily realize the configuration of the check valve that does not hinder the flow of water to the diversion channel. A dishwasher according to a fifth aspect of the present invention is the dishwasher according to the third or fourth aspect,
The check valve includes a case and a cap that are configured in combination with each other to form a part of a drainage channel, and a valve body that is disposed between the case and the cap and regulates water to flow in one direction from the case to the cap. And a cap formed with a hole leading to the water diversion channel.

According to this configuration, a simple check valve can be realized in addition to the effect of the third or fourth aspect of the present invention.

[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 according to an embodiment of the present invention. FIG. 2 is a rear view of the dishwasher of FIG. The dishwasher 1 includes a washing room 20 for storing dishes.
And a cleaning mechanism 2 for injecting cleaning water into the cleaning chamber 20
3 is provided.

The cleaning chamber 20 is formed in a hollow box shape, and has an opening defined on the front surface thereof. The opening is covered by an openable and closable door 21. A tableware basket 22 for holding tableware is arranged in the washing room 20, and an arm 31 is provided below the tableware basket 22. Multiple injection ports 3 of arm 31
Cleaning water is injected from 1a. The cleaning mechanism 23 includes the above-described arm 31, a cleaning pump 33 that pumps water to the arm 31 through a pipe 32, and a water supply mechanism 38 that supplies cleaning water into the cleaning chamber 20. The water supply mechanism 38 includes a pipe 38
The cleaning water can be supplied into the cleaning chamber 20 from a water supply facility (not shown) such as a water supply. The bottom of the cleaning chamber 20 is formed in a container shape and can store cleaning water. The bottom of the cleaning chamber 20 is a tube 3
The cleaning water is jetted from the arm 31 when the cleaning pump 33 is operated. The arm 31 is rotatably supported around the vertical axis in the washing room 20. The arm 31 is rotated by the reaction force of the washing water, and sprays the washing water onto the tableware in the tableware basket 22, so that the dishes are evenly distributed. Can be washed. In addition, a heater 24 is provided at the bottom of the cleaning chamber 20 to raise the temperature of the water in the cleaning chamber 20 so that cleaning can be easily performed with the warm water. Further, the heater 24 can heat the surrounding air and dry the dishes with hot air.

A pipe 58 is connected to the bottom of the washing chamber 20 of the dishwasher 1, and is connected to a water level detecting chamber 41 of a water level detecting switch 40 for detecting the water level of the washing chamber 20. Further, a pipe 56 for forming a drainage channel is connected to the bottom of the cleaning chamber 20. As shown in FIGS. 1 and 2, the drainage channel includes the above-described pipe 56, a drainage pump 52 connected to the pipe 56, and a drainage outlet 72 of the drainage pump 52.
b (see FIG. 4), one end of which is connected to the drain hoses 54 and 55 communicably connected to each other, the pipe joint 2a provided in the housing 2, and a hose (not shown) connected to the outside of the pipe joint 2a. Zu).

Further, the cleaning pump 33 and the drainage pump 52 are configured as the cleaning / draining pump 8 of one unit. The washing and draining pump 8 is provided with a motor 90 as a driving device thereof. One motor 90
Drives the cleaning pump 33 and the drainage pump 52. In the cleaning / draining pump 8, the rotation direction of the motor 90 is switched so that the cleaning pump 33 pumps and jets the cleaning water stored in the cleaning chamber 20, and the cleaning chamber 20 uses the drain pump 52. The drainage operation of draining the washing water stored in the drain through the drainage channel can be performed.

FIG. 3 is a partial cross-sectional side view of the cleaning and drainage pump of FIG. 2, showing a cross section taken along line C--C of FIG. FIG. 4 is a cross-sectional front view of the cleaning and drainage pump, and is a cross-sectional view taken along the line DD in FIG. 5 is a cross-sectional front view of the cleaning and drainage pump of FIG. 3, and is a cross-sectional view taken along the line EE in FIG. First,
Please refer to FIG. The washing and draining pump 8 includes a casing 8 that partitions a first flow path chamber 71 and a second flow path chamber 72 therein.
0, a first impeller 81 arranged in the first channel chamber 71 and fitted to the rotating shaft 90a of the motor 90, and a first impeller 81 arranged in the second channel chamber 72 and fitted to the rotating shaft 90a. And a second impeller 82. The motor 90 is connected to the casing 8
The oil seal 87 is provided between the casing body 83 of the casing 80 and the peripheral surface of the rotating shaft 90a, and is fixed to the end face of the casing 80 on the side of the second flow path chamber 72 side. doing. The motor 90 has a built-in bearing that rotatably supports the rotating shaft 90a, and the bearing rotatably supports the first impeller 81 and the second impeller 82.

The casing 80 includes a casing body 83.
, A casing wall portion 84, and a casing cover 85. The casing body 83 and the casing cover 85 are combined with each other via an O-ring 86 to form a container. A casing wall portion 84 is disposed between the casing body 83 and the casing cover 85, and divides the second passage chamber 72 near the motor 90 and the first passage chamber 71 on the opposite side.

The casing 80 includes a casing cover 85
A cleaning suction port 71a formed in a front cylinder portion 85b extending forward from the center of the front surface of the casing cover and communicating with the first channel chamber 71, and an outlet cylinder portion 85c extending upward from a right portion of the peripheral surface of the casing cover 85. The cleaning outlet 71b (see FIG. 5) that communicates with the first channel chamber 71 and an upper cylindrical portion 83e that extends horizontally from the upper part of the peripheral surface of the casing main body 83 are formed in the second channel chamber 72. A drainage outlet 72b (see FIG. 4) communicating with the drainage inlet 72a (see FIG. 4) formed in a lower cylindrical portion 83f extending horizontally from the lower part of the peripheral surface of the casing body 83 and communicating with the second flow path chamber 72. 4).

The washing pump 33 is a so-called spiral pump which draws in water from the spiral center and discharges water from the outer periphery of the spiral. As shown in FIG. 5, the washing pump 33 is constituted by a first flow path chamber 71 and a first impeller 81. Have been. First flow path chamber 7
Numeral 1 is formed in a spiral shape from a central suction port 71a to an outer peripheral discharge port 71b, and a first impeller 81 which is a rotary impeller having curved blades is arranged at the center. When the first impeller 81 rotates counterclockwise in the front view shown in FIG. 5, water is sucked from the suction port 71a, and water at the center is pushed out toward the outer periphery, and the water is discharged from the discharge port 71a.
b.

The drain pump 52 is a so-called vortex-type pump in which an impeller rotating in the flow path chamber moves water around it, and as shown in FIG. 4, a second flow path chamber 72 and radial blades are connected to each other. And a second impeller 82 that is a rotating disk having a plurality of rotating disks. Second impeller 82
However, when rotated clockwise in the front view shown in FIG. 4, a vortex is generated around the second impeller 82 by the concave portion formed between the blades, and water around the vortex can be moved. The drain pump 52 can suck water from the lower suction port 72a and discharge it to the upper discharge port 72b.

On the other hand, when the second impeller 82 is
When rotated counterclockwise in front view, the upper discharge port 72b
May inhale water. At this time, the discharge port 72
When air flows into the second flow path chamber 72 from the drain hose 54 connected to b, so-called air biting occurs, which may cause noise. In the present embodiment, the above-described noise is prevented by providing the check valves 56 in the drain hoses 54 and 55 connected to the discharge port 72b.

Referring to FIG. Drain hoses 54, 55
Are connected to each other, extend rearward from the drainage outlet 72b, extend upward along the rear surface of the cleaning chamber 20, and have a substantially inverted U shape.
It is formed in a shape of a letter and extends downward. The drain hose 54 is arranged on the upstream side of the drain channel and is connected to the drain outlet 72b. The drain hose 55 is
The downstream end of the drain hose 55 is disposed downstream of the drain passage, and is connected to a pipe joint 2 a fixed to a lower rear portion of the housing 2 to guide drain water to the outside of the machine.

Since the drainage hoses 54 and 55 are formed in an inverted U-shape with a middle height, water does not flow through the drainage channel until the top of the drainage hoses passes, and the drainage channel has no valve. The flow of water can be blocked. Further, once the water has passed over the top of the drain hoses 54 and 55 by the drain pump 52, the water can be drained through the drain channel by the siphon action.

A check valve 56 is arranged between the drain hose 54 and the drain hose 55. The check valve 56 is inserted in a middle part of the drainage channel, for example, in a portion extending upward from the drainage outlet 72b. The check valve 56 allows the flow of water in the direction flowing out from the discharge outlet 72b for drainage of the pump 8,
On the other hand, it is possible to prevent washing water or the like from flowing in the direction opposite to the drainage direction.

FIG. 6 is a sectional rear view of a portion near the check valve in FIG. The check valve 56 is formed between the case 61 and the cap 62 by forming a part of a drainage passage therein, and the check valve 56 is disposed between the case 61 and the cap 62 so that the check valve 56 moves in one direction from the case 61 to the cap 62. Member 63 including a valve body 63a that regulates the flow of water through the valve member 63
And Further, the check valve 56 is connected to a branch pipe 57 constituting a water diversion path to the water level detection chamber 41 on the downstream side of the drain flow with respect to the valve member 63, and the cap 62 is connected to the diversion path from the drain path to the water diversion path. A hole 62a that leads to the hole 62a is formed.

The casing 60 has therein a vertically extending drainage channel, and a horizontal diversion channel extending from the middle of the drainage channel through the hole 62a in the horizontal direction. The casing 60 includes a cylindrical case 61 forming a lower portion thereof,
Cap 6 on top of case 61 and fitted to each other
And 2. An O-ring 64 as a sealing member is interposed at a fitting portion between the case 61 and the cap 62.

The case 61 has a small diameter portion 61d and a large diameter portion 61.
e is formed in a two-stage cylindrical shape. The small diameter part 61d
A lower end of the drain hose 54 is connected to a lower end of the drain hose 54. A valve seat 61a is formed on the inner end face of the large diameter portion 61e. The valve seat 61a is an annular portion formed on the upper end surface inside the case 61, and a drainage channel is defined inside the ring. The large diameter portion 61e has a cap 6
2 are fitted in a watertight state.

The cap 62 has a main cylindrical portion 62b formed in a two-stage cylindrical shape with a large diameter portion 62e and a small diameter portion 62d.
And a branch tubular portion 62c that branches off from a middle portion of the small diameter portion 62d of the main tubular portion 62b. The lower end of the large diameter portion 62e of the main cylindrical portion 62b is fitted into the large diameter portion 61e of the case 61, and the upper end of the small diameter portion 62d of the main cylindrical portion 62b is connected to the upstream end of the drain hose 55. Large diameter portion 6 of main cylinder portion 62b
The valve body 2e is formed in such a size that the valve body 63a in the opened state can be accommodated therein, and the valve body 63a in this state does not obstruct the flow in the drainage channel. On the inner peripheral surface of the main cylindrical portion 62b,
A hole 62a is formed, and the main tubular portion 62b and the branch tubular portion 62c communicate with each other through the hole 62a.

The valve member 63 is formed of a flexible elastic member such as rubber or the like, and is in contact with a valve seat 61a formed in the above-described case 61 to close the drain passage. And a support portion 63b at one end of the valve body 63a for supporting the valve body 63a with flexibility so that the valve body 63a can be opened and closed with respect to the valve seat 61a. Support part 63b
The lower end surface of the large diameter portion 62e of the cap 62 and the case 6
It is fixed in a sandwiched state by the inner end face of the large diameter portion 61e.

The valve body 63a is rotatable about the support portion 63b as a fulcrum, and can open and close the drainage channel. Also, since the valve body 63a in the opened state is above the valve seat 61a,
The closed state can be brought into close contact with the elastic restoring force of the support portion 63b and the gravity. In addition, the check valve 56 is configured to open so as not to prevent the water that has passed through the check valve 56 from flowing to the diversion channel. That is, the hole 62a on the inner peripheral surface of the drainage channel
Is formed in a predetermined angle direction of the inner peripheral surface of the drainage channel,
A fixed position of the support portion 63b, which is a pivot point of the valve body 63a, is disposed on the inner peripheral surface of the drainage channel at an angular position opposite to the position where the hole 62a is formed. For example, in rear view, the hole 62
If “a” is on the right side of the inner peripheral surface of the drainage channel, the support portion 63b is fixed to the left side of the inner peripheral surface of the drainage channel opposite to the drainage channel. Thus, the valve body 63a can be opened so as to encourage water to go to the hole 62a. Therefore, even if the valve body 63a does not open completely at the time of drainage, the check valve 56 is opened. The valve can be opened so that the water passing therethrough and flowing downstream is not prevented from flowing to the diversion channel.

The hole 62a is arranged at an upper position near the valve member 63. Thus, most of the water blocked by the valve body 63a and accumulated on the valve body 63a can flow out to the diversion channel through the hole 62a. Therefore, the amount of water that accumulates in the drain hose 55 is extremely reduced, and the accumulation of drain water can be prevented. Also,
The hole 62a is provided in the water level detection chamber 4 of the diversion channel as shown in FIG.
It is provided at a position higher than the one side end. In particular, the diversion channel is provided such that the flow from the check valve 56 to the water level detection chamber 41 does not include a portion where the flow is an upward flow. Thereby, the flow passing through the water diversion channel from the hole 62a can flow into the water level detection chamber 41 reliably, and it is possible to reliably prevent water from collecting in the water diversion channel, the check valve 56, and the like. it can.

The water level detection switch 40 is shown in FIGS.
As shown in the figure, the float 42 provided in the container-like water level detection chamber 41 rises or falls with the rise and fall of the water level in the water level detection chamber 41, and accordingly, the float 42 is moved through the rod 43, the arm 44 and the like. , The operator of the micro switch 45 is operated, and the micro switch 45 can be operated according to a predetermined water level.

The water flowing from the branch pipe 57 into the water level detection chamber 41 can wash the float 42. Therefore, it is possible to wash away the dirt and residual vegetables adhered to the float 42, so that the float 42 can be prevented from becoming heavy or difficult to move. As a result, it is possible to prevent the water level from being unable to be accurately detected. The operation of the dishwasher 1 will be described.

When the washing and drainage pump 8 performs a draining operation, water flows out from the drainage discharge port 72b, and the drainage hose 54
Through the casing 60 (arrow F in FIG. 6).
1). Water is rotated in the check valve 56 by rotating the valve body 63a about the support portion 63b as a rotation fulcrum (arrow M).
1) Since the drainage channel is opened, water is drained through the drainage hose 55 (arrow F2 in FIG. 6). A part of this flow is transferred from the water diversion channel to the water level detection chamber 41 through the hole 62a.
Since it can flow into the inside (arrow F3 in FIG. 6), dirt on the float 42 can be washed away. In addition, since the flow passing through the check valve 56 is urged toward the hole 62a, it is possible to prevent dirt from attaching around the hole 62a, and as a result, it is possible to secure the flow from the hole 62a to the diversion channel.

When the draining operation of the washing / draining pump 8 is completed, water up to the top of the drainage channel may remain in the pipe without being drained. In this case, when water in the drainage channel downstream of the check valve 56 (this water is above the check valve 56) tries to flow back through the drainage channel, the check valve 5
6 is closed to prevent water from flowing back down the drain. Most of this water can flow into the water level detection chamber 41 from the hole 62a through the diversion channel (arrow F4 in FIG. 6).
The dirt on the float 42 can be more reliably washed off, and no water remains in the drain hose 55 or the diversion channel.

On the other hand, when the cleaning / draining pump 8 performs a cleaning operation, the second impeller 82 is driven counterclockwise in FIG. 4 as described above. At this time, the water flows into the second channel chamber 72 of the pump 8 from the drainage channel. Accordingly, a flow that flows backward through the drainage channel is generated, and the flow attracts the valve body 63a to the valve seat 61a, so that the drainage channel is securely closed.

As described above, according to the present embodiment, the check valve 56 in the drainage channel can prevent washing water and air from flowing in the drainage channel in the direction opposite to the drainage direction. It is possible to prevent air from being sucked into the cleaning / draining pump 8, that is, so-called air biting, and as a result, it is possible to prevent noise caused by air biting. Therefore, a dishwasher with a quiet operation sound can be realized.

Further, since the diversion channel connecting the drainage channel and the water level detection chamber 41 is provided, dirt and the like adhering to the water level detection float 42 can be washed away with the water passing through the diversion channel. It is possible to prevent a situation in which the float 42 malfunctions due to the adhesion of the residual vegetables and the like. Also,
Even if air from the diversion channel may enter the drainage hoses 54 and 55, the check valve 56 is located upstream of the diversion channel in the drainage direction. Can be reliably prevented from flowing into the pump 8, so that the pump 8 can be reliably prevented from being caught in the air.

When the check valve 56 is closed, the water above the check valve 56 flows into the water level detection chamber 41 through the water diversion channel, and the float 42 can be reliably washed. Moreover,
Since the check valve 56 is provided near the branch position of the diversion channel, it is possible to prevent water from being accumulated in the drain hose 55 above the branch valve. As a result, it is possible to prevent an unpleasant odor or the like caused by the water accumulated in the drain hose. be able to.

Since the check valve 56 is opened so as not to prevent the water passing through the drainage channel from flowing to the diversion channel, the flow of water to the diversion channel is reduced by inserting the check valve 56. It doesn't get worse. In particular, a valve body 63a for opening and closing the drainage channel
By disposing the supporting portion 63b, which is the pivot point of rotation, and the hole 62a connected to the diversion channel on the inner peripheral surface of the drainage channel so as to be on opposite sides, the flow of water to the diversion channel is obstructed. The non-return valve 56 can be realized with a simple configuration.

Also, a case 61 and a hole 62a to the diversion channel are provided.
And a valve body 63a between them.
Check valve 56 with a simple configuration.
Can be realized. In addition, the cap 62 and the case 61 are combined to function as a connection joint of the drain hoses 55 and 54 and the branch pipe 57, and
The case 61 has a valve seat 61a, and the cap 62 functions as a fixing member for the valve member 63. In this way, the cap 62 and the case 61 can further simplify the check valve 56 by also using the member that constitutes the valve that opens and closes the drainage channel and the above-described connection pipe joint.

In the above-described embodiment, the check valve 56
Although the configuration having the casing 60 and the valve member 63 has been described, the present invention is not limited to this. In short, it suffices if there is a member forming a valve seat as a check valve and a member forming a valve body. For example, a ball valve type in which a ball as a valve body which can be freely moved toward and away from an annular valve seat is also conceivable.

In the above embodiment, the drain hose 5
4, 55 are connected to each other and configured as one hose, but may be configured as a single member hose. In this case, a configuration is conceivable in which a check valve 56 is provided at the end of the hose. In addition, various design changes can be made without changing the gist of the present invention.

[0046]

According to the first aspect of the present invention, the following effects can be obtained. In other words, the check valve in the drainage channel can prevent washing water or air from flowing in the drainage channel in the direction opposite to the drainage direction, thereby preventing air entrapment and reducing noise caused by air entrapment. As a result, a dishwasher with a quiet driving sound can be realized.

According to the second aspect of the present invention, the following effects are obtained in addition to the effects of the first aspect of the present invention. That is, dirt and the like attached to the float for detecting the water level can be washed away with the water passing from the drainage hose to the water diversion channel, so that the float can be prevented from malfunctioning due to the attachment of residual vegetables and the like. Further, since the check valve is located on the upstream side of the drainage hose with respect to the water diversion channel, it is possible to reliably prevent the air from the diversion channel from flowing into the pump, and thus to reliably prevent the air from being caught. Also, when the check valve is closed, the water above it passes through the diversion channel, so that the float can be reliably washed, and since the check valve is located near the branch position of the diversion channel, Water can be prevented from accumulating in the drain hose.

According to the third aspect of the invention, in addition to the effect of the second aspect, the check valve is opened so as not to prevent the water passing through the drain hose from flowing to the diversion channel. Therefore, the flow of water to the diversion channel does not deteriorate due to the insertion of the check valve. According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, the pivot point of the valve body for opening and closing the drainage channel and the hole connected to the water diversion channel are arranged on opposite sides. By arranging the check valve on the inner peripheral surface of the drainage channel, it is possible to easily realize the configuration of the check valve that does not hinder the flow of water to the diversion channel.

According to the fifth aspect of the invention, in addition to the effects of the third or fourth aspect, the case, the cap having a hole to the water diversion channel, and the valve element interposed therebetween provide: A simple check valve can be realized.

[Brief description of the drawings]

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

FIG. 2 is a rear view of the dishwasher of FIG. 1;

FIG. 3 is a partial cross-sectional side view of the cleaning and drainage pump of FIG. 1;

FIG. 4 is a sectional front view of the washing and drainage pump of FIG. 3;
FIG. 4 is a sectional view taken along a line D-D in FIG. 3.

FIG. 5 is a sectional front view of the washing and draining pump of FIG. 3;
FIG. 4 is a cross-sectional view taken along the line EE in FIG. 3.

FIG. 6 is a sectional rear view of a portion in the vicinity of the check valve of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dishwasher 8 Washing and drainage pump 20 Washing chamber 41 Water level detection chamber 54, 55 Drain hose (drainage channel) 56 Check valve 58 Branch pipe (division channel) 61 Case 62 Cap 62a Hole 63a Valve body 63b Support part (rotation) (Fulcrum) 72b Discharge port for drainage

Claims (5)

[Claims] 1. A cleaning operation for pumping and jetting cleaning water stored in a cleaning chamber and a draining operation for draining cleaning water stored in the cleaning chamber through a predetermined drainage channel by switching the rotation direction. A dishwasher having a washing and draining pump which can be operated, wherein a check valve is provided in a drainage channel for preventing washing water or the like from flowing in a direction opposite to a drainage direction. . 2. The dishwasher according to claim 1, wherein the drainage channel includes a drainage hose connected to a drainage outlet of the cleaning and drainage pump, the drainage hose extending upward from the drainage outlet. From the drainage hose extending upward from the drainage outlet to a water level detection chamber provided for detecting the water level of the cleaning water in the cleaning chamber. A dishwasher, wherein a connecting diversion channel is branched, and a check valve is inserted at an upstream position in a drain direction in the vicinity of a portion of a drain hose from which the diversion channel is branched. 3. The dishwasher according to claim 2, wherein the check valve is opened so as not to prevent water passing through the check valve from flowing into the diversion channel. Machine. 4. The dishwasher according to claim 3, wherein the check valve includes a valve element which pivots around a pivot point to open and close the drainage channel, and a predetermined angular direction of an inner peripheral surface of the drainage channel. A hole connected to the diversion channel is formed, and the rotation fulcrum of the valve element is disposed on the inner peripheral surface of the drainage channel at an angular position opposite to the position where the hole is formed, so that the water flows to the diversion channel. A dishwasher characterized by a configuration that does not impede water. 5. The dishwasher according to claim 3, wherein the check valves are arranged in combination with each other to form a part of the drainage channel, and the check valves are arranged between the case and the cap. A dishwasher, comprising: a valve body that regulates the flow of water in one direction from a container to a cap; and a hole formed in the cap to communicate with a water diversion channel.