JP2001321315A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost by reducing the number of components of a on return valve for preventing the reverse flow of the drain water to a pump room. SOLUTION: A cylindrical non-return valve case 422 of a large diameter is integrated with an end of a discharge pipe 42 formed on a drain side casing 40 forming the contour of the drain pump room, and a large diameter portion 511 of a cap member 51 is fitted thereto across a supporting base body 522 of a valve member 52. A hose for connecting a discharge port to the non return valve can be dispensed with, the conventionally separate non-return valve case can be dispensed with, and the number of components can also be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a dishwasher.

[0002]

2. Description of the Related Art As a dishwasher, water is stored at the bottom of a washing cabinet containing dishes, the water is sucked by a washing pump and sent to a nozzle, and water is sprayed from the nozzle onto the dishes. It is known to carry out cleaning and rinsing of types. In this type of dishwasher, from the viewpoint of cost and space saving, a washing pump that sucks water at the time of washing and sends it to the nozzle by pressure, and water stored in the washing chamber after washing or rinsing is sent out of the machine A washing / draining pump in which a drainage pump for discharging is unitized is generally used.

FIG. 14 is a side longitudinal sectional view showing the entire structure of a conventional general dishwasher using a washing and drainage pump. A washing cabinet 2 also serving as a drying chamber is provided inside the machine casing 1, and a door 3 whose lower end is pivotally supported is provided at the front opening of the washing cabinet 2 so as to be openable and closable. A rotatable arm 4 having a plurality of nozzles 5 formed on the upper surface is provided at the center of the bottom of the washing chamber 2. In addition, a water tank 6 provided with a circulation port 7 and a drain port 8 at the side thereof is provided at the bottom of the washing chamber 2 so as to communicate with each other. A mesh filter 9 for collecting residual vegetables is provided.

[0004] A water supply valve 12 is provided at the rear of the machine casing 1, and water supplied from the outside via the water supply valve 12 is poured into the washing chamber 2 from a water supply port 13, and is supplied to a predetermined water level. Is stored. A cleaning / drainage pump 10 is arranged below the bottom of the cleaning chamber 2. The cleaning and drainage pump 10 includes a casing 24 in which a cleaning pump chamber 101 and a drainage pump chamber 102 are partitioned by a partition 25, a cleaning impeller 22 rotatably provided in the cleaning pump chamber 101, and a drainage pump chamber. Drain impeller 23 rotatably provided in 102
And a pump motor 20 for driving the two impellers 22 and 23 coaxially. The cleaning pump chamber 101 communicates with the circulation port 7 and the arm 4, and the drain pump chamber 102 communicates with the drain port 8 and the drain hose 11.

At the time of washing and rinsing, the pump motor 20
The washing impeller 22 is rotated in the normal rotation direction, and the rotating washing impeller 22 sends out the water sucked from the water storage tank 6 through the circulation port 7 to the arm 4. On the other hand, at the time of drainage, the pump motor 20 is driven to rotate in the reverse direction, and the rotating drain impeller 23 discharges water sucked from the water storage tank 6 through the drain port 8 to the outside through the drain hose 11.

[0006]

However, for example, when the cleaning impeller 22 is rotated in a predetermined direction for cleaning, the drain impeller 23 rotates in the opposite direction. That is, water is sucked from the drain hose 11 side, and is sucked into the air together with the water, which may cause so-called air biting. To prevent such air biting, Japanese Patent Application Laid-Open No. H11-128
In the dishwasher described in Japanese Patent No. 145, a check valve for preventing water from flowing in a direction opposite to a drain direction is provided in a drain channel.

FIG. 15 is a schematic sectional view showing a mounting structure of the check valve. A cylindrical case 81 is fitted at the end of a drain hose 80 connected to the discharge port 42 of the drain pump chamber 102, and a cylindrical cap 84 is fitted via an O-ring 82 for sealing. The drain hose 11 that communicates with the outside of the machine is connected to the cap 84. A support base of a valve body 83 made of an elastic member is sandwiched between the case 81 and the cap 84. At the time of drainage operation, the valve body 83 is pivoted about the support base as shown by a two-dot chain line in FIG. Butterflies open the drain. At other times, the water accumulated in the upper valve chamber side seats on the valve seat inside the case 81 to prevent the water from flowing backward.

However, in order to provide a check valve having the above structure, the drain hose is divided into two (the drain hoses 80 and 1).
1), a case 81, a cap 84, a valve body 8
3. A check valve consisting of an O-ring 82 is installed, which increases the cost. Therefore, there is a demand for a low-cost structure having a smaller number of components than such a conventional one.

[0009] The dishwasher as described above requires a considerably large installation space. In contrast, in recent years, dishwashers with a small depth that can be installed in a narrow space beside a sink have become commercially available. In such a dishwasher, the washing and drainage pump 10 cannot be disposed so as to extend in the front-rear direction of the dishwasher as shown in FIG. For example, it is necessary to arrange horizontally so as to extend in the width direction. In that case, the circulation port 7 of the water storage tank 6 and the cleaning pump chamber 101 cannot be connected linearly. Therefore, as one method, it is conceivable to connect the circulation port 7 and the cleaning-side suction port of the cleaning / draining pump 10 with a flexible hose or the like, but it is preferable in terms of cost because the number of parts increases. Absent. Therefore, a cleaning and drainage pump having a structure and a shape suitable for such an arrangement is desired.

The present invention has been made to solve these problems, and a first object of the present invention is to provide a structure capable of reducing the cost of providing a check valve in a drainage passage. To provide a dishwasher provided with a check valve. A second object of the present invention is to provide a structure that does not increase the cost and does not deteriorate the pump performance even when the washing and draining pump is arranged to extend in the width direction of the machine frame. To provide a dishwasher equipped with a washing and drainage pump.

[0011]

Means for Solving the Problems and Effects of the Invention A dishwasher according to a first aspect of the present invention, which has been made to solve the above-mentioned problems, sucks water stored at the bottom of a washing cabinet and places the water into the washing cabinet from a nozzle. A cleaning operation in which a single motor is used to selectively perform a cleaning operation of ejecting water and a drainage operation of sucking water stored in the bottom of the cleaning chamber and discharging the water to the outside through a drainage channel. In a dishwasher provided with a drain pump, the drain channel has a check valve for preventing water from flowing in a direction opposite to a drain direction during a drain operation, and the check valve includes: A washing and drainage pump, wherein the pipe is formed at an end of a discharge pipe forming a part of the drainage channel, which is integrally and extendedly provided in a casing forming a drainage pump chamber in which a drainage impeller is provided. A cylindrical body having a larger diameter than And a cap member connected to a drain hose that forms a part of a drain passage while c is fitted between the tubular member and the cap member. A valve body for flowing water in one direction from the drainage pump chamber side to the drainage hose side and preventing the water from flowing in the opposite direction.

According to this configuration, by the action of the valve element,
Since water is prevented from flowing in the drainage channel in the direction opposite to the drainage direction, for example, even if the drainage impeller is rotationally driven in the opposite direction to the drainage operation during the cleaning operation, the water flows back in the drainage channel. Therefore, it is possible to prevent air from flowing into the drain pump chamber. In addition, since the cylindrical body forming a part of the valve chamber of the check valve is formed integrally with the casing forming the drain pump chamber, the discharge port of the cleaning and drain pump, which is required in the conventional structure, is formed. There is no need for a drain hose that connects to the check valve or a component corresponding to the cylindrical body (that is, the case 81 in the above description). That is, since the number of parts can be reduced, the cost can be significantly reduced.

[0013] In one embodiment of the dishwasher according to the first aspect of the present invention, the casing of the washing and draining pump has a washing side casing forming an outer shape of a washing pump chamber, a draining side casing forming an outer shape of a drainage pump chamber, and It is possible to include a partition for partitioning the washing pump chamber and the drain pump chamber, and the drain pipe is provided in the drain casing. According to this configuration, the tubular body is provided integrally with the drain side casing.

[0014] The drain pump chamber may have a suction port extending laterally and a discharge pipe extending upward. According to this configuration, due to gravity acting on the valve element of the check valve provided at the end of the discharge pipe, the valve element can be more reliably closed except during the drain operation.

According to a second aspect of the present invention, there is provided a dishwasher, comprising: a cleaning impeller as a cleaning pump for sucking water stored at the bottom of the cleaning chamber and ejecting the water from a nozzle into the cleaning chamber. In a dishwasher using a centrifugal pump for pushing water sucked from the center front of the washing pump to the outer peripheral side, a casing forming an outer shape of the washing pump chamber extends in a substantially L-shape toward the center front of the washing impeller. A flow path having a suction pipe and a discharge pipe on the outer peripheral side, and a front surface wall of the casing facing the front surface of the cleaning impeller, the flow path having a gradually increasing cross-sectional area from the extension base of the suction pipe to the discharge pipe. A substantially annular concave portion bulging toward the cleaning pump chamber is formed around the extension base portion, and a portion sandwiched between the front wall and the suction pipe is formed as a concave portion. And a large number of small recesses are formed in the thick wall portion between the outer surface and the inner surface from the cleaning pump chamber side. A predetermined rib is provided upright as described above.

According to this configuration, the portion sandwiched between the front wall of the casing and the suction pipe does not have a concave portion, and is formed substantially flush with the outer surface of the adjacent flow passage. At the time of molding, the mold can be removed in a direction substantially perpendicular to the end face opening of the suction pipe. If the thick portion between the outer surface and the inner surface remains as it is, it tends to be defective at the time of molding, but by forming the rib, the extreme thickness is substantially eliminated. Therefore, such defects are unlikely to occur. Also, if the thick portion is simply hollowed out without forming the rib, water sucked through the suction pipe becomes turbulent at that portion, which may deteriorate the pump performance. Is formed, no large turbulence occurs, and the pump performance is not degraded. Further, since the suction pipe is bent in a substantially L shape, even if this cleaning pump is arranged to extend in the width direction with respect to the machine frame, the suction pump is sucked into the circulation port of the storage tank located in front of the suction pump. Pipes can be connected directly.

In one embodiment of the dishwasher according to the second aspect of the present invention, the washing pump is configured to perform a washing operation of sucking water stored in a bottom of the washing box and ejecting the water from a nozzle into the washing box. The drainage operation of sucking the stored water and discharging it to the outside of the machine through the drainage channel is realized as a part of a washing and drainage pump that is selectively performed by switching the rotation direction of a single motor, The casing includes a washing-side casing forming an outer shape of a washing pump chamber, a draining-side casing forming an outer shape of a drainage pump chamber, and a partition partitioning the washing pump chamber and the drainage pump chamber. And a discharge pipe can be provided.

If the shape of the rib is, for example, a lattice, the shape of the mold does not need to be complicated.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a dishwasher according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side longitudinal sectional view of a dishwasher according to the present embodiment. This dishwasher has a thin structure with a small depth so that it can be installed, for example, in a narrow space beside a kitchen sink. The same or corresponding parts as those in FIG. 14 are denoted by the same reference numerals, and description thereof will be omitted.

In the present dishwasher, the front opening of the washing box 2 is provided with an upper door 3 pivotally supported at its upper and lower ends, respectively.
a and the lower door 3b are mounted so as to open while rotating in the directions of arrows a and b in FIG. A rotatable arm 4 having a plurality of nozzles 5 formed on the upper surface is provided at the bottom of the washing chamber 2. In this dishwasher, since the width of the washing box 2 is larger than the depth, water does not reach both sides of the washing box 2 with only one arm. Therefore, another arm (not shown) is provided side by side at a position that does not interfere with the arm 4 during rotation.

A washing and drainage pump 10 is arranged below the bottom of the washing box 2. A cleaning pump chamber (not shown in FIG. 1) of the cleaning / draining pump 10 is connected to the circulation port 7 through a cleaning-side suction pipe 31 formed in a substantially L shape, and is connected through a cleaning-side discharge pipe 32. It is connected to a water passage 14 extending in the horizontal direction. This water passage 14 is a water passage in the arm 4 (and a water passage in another arm not shown).
Is in communication with A drain pump chamber (not shown) is connected to the drain port 8 via a drain suction pipe (not shown), and a discharge pipe 42 is connected to the outside of the machine via a drain hose. When the pump motor of the washing / draining pump 10 is driven to rotate in the normal rotation direction, the water sucked from the water storage tank 6 through the circulation port 7 is fed to the arm 4 by the action of the washing impeller as described later. On the other hand, at the time of drainage, the pump motor is driven to rotate in the reverse direction, and the water sucked from the water storage tank 6 through the drainage port 8 is discharged to the outside through the drainage hose by the action of the drainage impeller.

The structure of the washing and draining pump 10, which is one of the features of the present invention, will be described in detail. FIG. 2 is a longitudinal sectional view showing a configuration of a main part of the main cleaning and drainage pump 10, and FIG. 3 is a front view. The cleaning and drainage pump 10 includes a casing 24 that internally partitions a cleaning pump chamber 101 and a drainage pump chamber 102, a pump motor 20 that can be driven to rotate forward and reverse, and a pump motor that is inside the cleaning pump chamber 101. 20 includes a cleaning impeller 22 attached to the rotating shaft 21 and a drain impeller 23 attached to the rotating shaft 21 in the drain pump chamber 102.

The casing 24 includes a washing-side casing 30.
, A drain side casing 40, and both casings 30, 40
And a partition 25 sandwiched between them. The rotating shaft 21 of the motor 20 penetrates the drainage casing 40 and the partition 25. Between the back surface of the cleaning impeller 22 and the partition 25,
And, between the drain impeller 23 and the partition 25, a concave portion and a convex portion are formed in a predetermined shape while maintaining an appropriate gap,
It forms a so-called labyrinth connection. by this,
High liquid tightness between the cleaning pump chamber 101 and the drain pump chamber 102 is achieved. As a material for forming the casing 24, a plastic mixed with a reinforcing material such as glass fiber, for example, a polypropylene resin containing glass fiber is used in consideration of robustness and durability.

The washing-side casing 30 has a washing-side suction port formed in a washing-side suction pipe 31 extending in an L-shape from the center of the front surface thereof, and a washing-side inlet extending straight upward from the right side of the peripheral surface. A cleaning-side discharge port formed in the discharge pipe 32; The cleaning impeller 22 has a plurality of wings in a spiral shape on the front surface of a disk-shaped base that curves from the outer peripheral side toward the center. When the cleaning impeller 22 is rotated in a predetermined direction, It functions as a centrifugal pump that pushes water sucked from the front to the outer peripheral side. That is, the water sucked from the cleaning-side suction port is discharged from the cleaning-side discharge port.

On the other hand, the drain-side casing 40 has a drain-side suction port formed in a drain-side suction pipe 41 extending in a horizontal tubular shape and a drain-side discharge port extending in a straight tubular shape obliquely upward from the left side of the peripheral surface. And a drain side discharge port formed in the pipe 42. The drain impeller 23 is provided with a plurality of wings radially around the front surface of a flat disk-shaped base. When the drain impeller 23 is rotated in a predetermined direction, water sucked from the side is taken along the outer periphery. Acts as a vortex pump, pushing it away to the side. That is, the water sucked in from the drain side suction port is discharged from the drain side discharge port.

FIGS. 4A and 4B are external views of the cleaning side casing 30, wherein FIG. 4A is a front view and FIG. 4B is a side view. FIG. 5 is a sectional view taken along line AA ′ in FIG. FIG. 6 shows FIG.
It is a BB 'line sectional view in (b). FIG. 7 is a rear view of the cleaning side casing 30.

As described above, the washing pump is a volute pump. In the centrifugal pump, the separation distance from the front surface of the cleaning impeller 22 at the extension base 33 at the base of the cleaning-side suction pipe 31 is minimized, and the cross-sectional area of the flow path 34 is gradually increased toward the cleaning-side discharge pipe 32. Therefore, the extension base portion 33 is formed as a concave portion depressed inward, and the flow path 34 spirally disposed around the base portion 33 has a width (that is, a space between the outer peripheral wall 342 and the inner peripheral wall 343) that is cleaned. The width of the front wall 341 is gradually increased toward the side discharge pipe 32 (see FIG. 6), and the front wall 341 has a shape in which the forward swelling is gradually increased.

The cleaning-side suction pipe 3 having such a bent shape.
In order to mold No. 1 using a mold, P1 and P2 in FIG.
Is a part (that is, a contact portion of a plurality of molds), and the mold needs to be removed in the right direction (the direction of arrow Pa). For this purpose, the above-described recess cannot be left in the extension base portion 33 that forms a narrow gap with the cleaning-side suction pipe 31, and as shown in FIG. A flat portion 35 having a uniform height is formed. However, if the inner wall surface of the flat portion 35 is left as it is (thickness t in FIG. 5), a failure is likely to occur during resin molding.

Therefore, in this dishwasher, FIGS.
As shown in the figure, a grid-like rib 351 is provided on the inner wall surface of the flat portion 35 so as not to be extremely thick. If a hollow portion is formed in this portion without providing the rib 351, water sucked through the cleaning-side suction pipe 31 generates a turbulent flow in the hollow portion, thereby lowering the suction performance of the pump. On the other hand, by providing the rib 351 having a narrow lattice spacing as in the present embodiment, it is possible to prevent the occurrence of turbulent flow and to prevent the performance of the pump from being largely deteriorated, and also to prevent the above-described failure during molding. Can also be prevented.

Next, the structure of the check valve which is another characteristic of the present invention will be described. In the dishwasher according to the present embodiment, a check valve is integrally provided on the drain side casing 40 of the above-mentioned washing and draining pump 10.

FIGS. 8 and 9 are a top view and a front view showing the appearance of the drain side casing 40, and FIGS. 10 (a) and 10 (b) are sectional views taken along lines CC 'and DD' in FIG. 11
11A is a side view, and FIG. 11B is a cross-sectional view taken along line EE ′ in FIG. FIG. 12 is a partial sectional view showing the structure of the check valve.

As described above, the drain side casing 40 is
A drain-side discharge pipe 42 extends obliquely upward from a substantially cylindrical side peripheral wall 43. This discharge pipe 42
In the figure, a cylindrical check valve case 422 having a larger diameter than the pipe 41 is integrally formed at an end of a small-diameter cylindrical pipe 421. As shown in FIG. 12, the check valve 50 includes a cap member 51 and a valve member 52 in addition to the check valve case 422.
It is composed of The cap member 51 has a large-diameter portion 511 that fits inside the check valve case 422, and an L-shaped pipe 512 that is integrally formed on the upper portion. The O-ring 53 is interposed as a seal member inside the check valve case 422, and the large-diameter portion 511 of the cap member 51 is fitted. A ring-shaped valve seat 423 is formed on the upper end surface inside the check valve case 422. Although not shown, the pipe 51 of the cap member 51 is not shown.
A drain hose that communicates with the outside of the machine is connected to the end of 2.

The valve member 52 is formed of a flexible elastic member such as rubber or the like. The valve member 52 is large enough to abut a valve seat 423 formed on the check valve case 422 to close the flow passage. 521, and a support base 522 at one end of the valve body 521 for supporting the valve body 521 to be openable and closable with respect to the valve seat 423, and the support base 522 is a large diameter portion 5 of the cap member 51.
11 and the inner end surface of the check valve case 422.

The valve body 521 rotates about the support base 522 as a fulcrum, and opens and closes the flow path. That is, the drainage pump room 10
When the water is not discharged from the valve base 2, the valve body 521 is in close contact with the valve seat 423 and closed by the elastic restoring force and the gravity of the support base 522 (the state shown by the solid line in FIG. 12). This prevents water from flowing backward from the flow path above the valve body 521 to the drain pump chamber 102 side. On the other hand,
As described above, when the drain impeller 23 is driven to rotate and water is discharged from the drain pump chamber 102, the valve body 521 pivots around the support base 522 to be opened by the pressure of the water (see the dotted line in FIG. 12). State), water flows from the discharge side discharge pipe 42 side to the cap member 51 side.

As described above, in the dishwasher according to the present embodiment, the check valve case 422, which is a member of the check valve 50, is integrated with the drainage casing 40, so that it is conventionally provided separately from the drainage casing. This eliminates the need for a check valve case, which is a body member, and a hose for connecting the check valve case and the discharge pipe on the drain side. Therefore, the number of parts can be reduced as compared with the conventional configuration, and the cost can be reduced.

Although a plurality of molds are used for forming the drainage casing 40, a mold having a part P4 in FIG. And the mold is pulled out in the direction of arrow Pb in FIG. As shown in FIG.
The flange 44 and the pipe 42 projecting further outward from 3
The connection portion 424 with the first portion 414 has a shape such that no wedge-shaped gap is formed between the outer peripheral surface of the pipe 421 and the flange portion 44. Therefore, the die can be removed smoothly in the direction of arrow Pb as described above.

By the way, in this dishwasher, the washing
A heater is disposed on the inner bottom of the washing box 2 so that the water stored in the bottom of the washing box 2 can be heated during washing or rinsing, and the air in the washing box 2 can be heated during drying. It has become. In addition, a thermistor for detecting temperature and a thermal fuse for detecting overheating are provided outside the bottom surface of the cleaning chamber 2 so that heating control can be performed at this time.

FIGS. 13A and 13B are views showing a mounting structure of the thermistor and the thermal fuse. FIG. 13A is a top view of a holder 60 for mounting, and FIG. It is a FF 'line sectional view in a state.

The holder 60 has a substantially L-shaped side surface, a screw hole 61 on the lower surface, a claw 62 capable of detachably holding a thermistor 70 and an attachment opening 63 for a thermal fuse 71 on an upright surface. , And projecting rearward at the upper portion thereof,
Are formed. On the other hand, at the corner of the bottom wall of the cleaning cabinet 2 to which the holder 60 is attached, a boss 202 having a screw hole is provided upright on the bottom wall 201. A rib 204 projects downward at a predetermined position of the horizontal wall 204, which is higher than the bottom wall 201 via the vertical wall 203. Reference numeral 206 denotes a heater.

When the holder 60 is attached to the corner of the bottom wall of the washing chamber 2, as shown in FIG.
The thermistor 70 and the temperature fuse 71 are brought into close contact with the vertical wall 203 by inserting the spring-like portion 64 into the gap between the rib 205 and the rib 205, and the screw 72 is inserted from below into the screw hole 61 and screwed into the screw hole of the boss 202. I do. The upper part of the holder 60 is firmly fixed by the pressing of the spring-like portion 64 against the rib 204, and the thermistor 70 and the thermal fuse 71 surely adhere to the vertical wall 203 by the bending of the spring-like portion 64.

The above embodiment is merely an example,
Obviously, modifications and changes can be made within the spirit of the present invention.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view of a washing and draining pump in the dishwasher according to the embodiment.

FIG. 3 is a front view of a washing and drainage pump in the dishwasher according to the embodiment.

FIG. 4 is an external front view (a) and an external side view (b) of a cleaning side casing of the main cleaning and drainage pump.

FIG. 5 is a sectional view taken along line A-A ′ in FIG.

FIG. 6 is a sectional view taken along line B-B ′ in FIG. 4 (b).

FIG. 7 is an external rear view of a cleaning side casing of the main cleaning and drainage pump.

FIG. 8 is an external top view of a drain side casing of the main cleaning / drain pump.

FIG. 9 is an external front view of a drain side casing of the main cleaning / drain pump.

10 is a sectional view taken along line CC ′ in FIG. 9 (a) and FIG.
D 'line sectional drawing (b).

11 is a side view of an external appearance of a drain side casing of the main cleaning / drain pump (a) and a cross-sectional view taken along line EE ′ in FIG.

FIG. 12 is a partial cross-sectional view showing the structure of a check valve in the dishwasher of the present embodiment.

FIG. 13 is a top view (a) showing a mounting structure of a temperature detecting unit in the dishwasher of the present embodiment, and a sectional view taken along line FF ′.

FIG. 14 is a side longitudinal sectional view showing a configuration of a conventional general dishwasher.

FIG. 15 is a longitudinal sectional view showing the structure of a conventional check valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Cleaning and drainage pump 101 ... Cleaning pump room 102 ... Drainage pump room 20 ... Pump motor 21 ... Rotating shaft 22 ... Cleaning impeller 23 ... Drainage impeller 24 ... Casing 25 ... Partition wall 30 ... Cleaning side casing 31 ... Cleaning side suction pipe 32 ... Washing side discharge pipe 33 ... Extension base 34 ... Flow path 341 ... Front wall 342 ... Outer circumference wall 343 ... Inner circumference wall 35 ... Flat part 351 ... Rib 40 ... Drain side casing 41 ... Drain side suction pipe 42 ... Drain side discharge pipe 421 pipe 422 check valve case (tubular body) 423 valve seat 43 side peripheral wall 44 flange 50 check valve 51 cap member 511 large diameter portion 512 pipe 52 valve member 521 valve Body 522: Support base 53: O-ring

Continued on the front page (72) Inventor Tetsuo Harada 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3B082 BD02 BD04 BF02 BF03 BF05

Claims (6)

[Claims] 1. A cleaning operation for sucking water stored at the bottom of a washing box and ejecting the water from a nozzle into the washing box, and sucking the water stored at the bottom of the washing box and discharging the water out of the machine through a drain passage. In a dishwasher provided with a washing and draining pump that selectively performs the draining operation by switching the rotation direction of a single motor, in the drainage channel, water is supplied in a direction opposite to the draining direction during the draining operation. A check valve for preventing circulation, the check valve being provided integrally with and extending from a casing forming a drainage pump chamber in which the drainage impeller is provided in the washing and drainage pump; A cylindrical body having a larger diameter than the pipe formed at the end of the discharge pipe forming a part of the drainage channel; and b) one end fitted to the cylindrical body to form a valve chamber. And a cap whose other end is connected to a drainage hose forming a part of a drainage channel. C) a valve element that is sandwiched between the cylindrical body and the cap member to flow water in one direction from the drain pump chamber side to the drain hose side, and to prevent water flow in the reverse direction. And a dishwasher, comprising: 2. The casing of the washing and draining pump,
A washing side casing forming the outer shape of the washing pump chamber, a draining side casing forming the outer shape of the drainage pump chamber, and a partition partitioning the washing pump chamber and the drainage pump chamber, wherein the discharge pipe is provided in the drainage side casing. The dishwasher according to claim 1, wherein the dishwasher is formed. 3. The dishwasher according to claim 1, wherein the drain pump chamber has a suction port extending laterally, and has the discharge pipe extending upward. 4. A dishwasher using a vortex pump as a cleaning pump for sucking water stored at the bottom of the cleaning chamber and ejecting the water from a nozzle into the cleaning chamber, and for pushing water sucked from the front center of the cleaning impeller to the outer peripheral side. In the above, the casing forming the outer shape of the cleaning pump chamber has a suction pipe which is bent in a substantially L-shape and extends in front of the center of the cleaning impeller, has a discharge pipe on the outer peripheral side, and faces the front surface of the cleaning impeller. The front wall of the casing bulges around the extension base toward the cleaning pump chamber to form a flow path having a gradually increasing cross-sectional area from the extension base of the suction pipe to the discharge pipe. A substantially annular concave portion is formed, and a portion sandwiched between the front wall and the suction pipe is formed substantially flush with an outer surface of an adjacent flow channel without forming a concave portion, and Dishwasher, characterized in that erected a predetermined rib as small a number of recesses from the washing pump chamber side is formed in the thick portion of the thick between the side surface. 5. The cleaning pump according to claim 1, wherein the cleaning pump sucks water stored at a bottom of the cleaning chamber and ejects the water from a nozzle into the cleaning chamber. The draining operation for discharging to the outside is realized as a part of a washing and draining pump that is selectively performed by switching the rotation direction of a single motor, and the casing is a washing side forming an outer shape of a washing pump chamber. A casing, a drainage casing forming an outer shape of the drainage pump chamber, and a partition partitioning the washing pump chamber and the drainage pump chamber, wherein the suction pipe and the discharge pipe are provided in the cleaning side casing. 4. The dishwasher according to 4. 6. The dishwasher according to claim 5, wherein the rib has a lattice shape.