JP3768068B2 - dishwasher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dishwasher.
[0002]
[Prior art]
As a dishwasher, water is stored in the bottom of a washing cabinet containing dishes, and the water is sucked by a washing pump and sent to a nozzle, and the dishes are washed and rinsed by jetting water from the nozzle to the dishes. The thing of the structure which performs is known. In this type of dishwasher, from the viewpoint of cost and space saving, a washing pump that sucks water during washing and pumps it to the nozzle, and the water stored in the washing cabinet after the washing is rinsed out of the machine. A washing and draining pump in which a drainage pump for discharging is unitized is generally used.
[0003]
FIG. 14 is a side longitudinal sectional view showing an entire configuration of a conventional general dishwasher using a washing and draining pump. A washing cabinet 2 also serving as a drying chamber is arranged 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 cleaning cabinet 2. In addition, a water storage tank 6 in which a circulation port 7 and a drainage port 8 are provided on the side is provided in communication with the bottom of the washing chamber 2, and the upper surface of the water storage tank 6 flows down from dishes. A mesh-like filter 9 for collecting leftovers is provided.
[0004]
A water supply valve 12 is provided at the rear portion of the machine frame 1, and water supplied from the outside through the water supply valve 12 is poured into the washing cabinet 2 from the water supply port 13, and water up to a predetermined water level is stored. The A washing and draining pump 10 is disposed below the bottom surface of the washing cabinet 2. The washing and drainage pump 10 includes a casing 24 in which the washing pump chamber 101 and the drainage pump chamber 102 are partitioned by a partition wall 25, a washing impeller 22 rotatably provided in the washing pump chamber 101, and a drainage pump chamber. A drainage impeller 23 rotatably provided in 102 and a pump motor 20 that rotates both the impellers 22 and 23 coaxially are included. The cleaning pump chamber 101 communicates with the circulation port 7 and the arm 4, and the drainage pump chamber 102 communicates with the drainage port 8 and the drainage hose 11.
[0005]
At the time of washing and rinsing, the pump motor 20 is rotationally driven in the forward rotation direction, and the washing impeller 22 rotated thereby sends out water sucked from the water storage tank 6 through the circulation port 7 to the arm 4. On the other hand, during drainage, the pump motor 20 is driven to rotate in the reverse direction, and the drainage impeller 23 thus rotated discharges the water sucked from the water storage tank 6 through the drainage port 8 to the outside through the drainage hose 11.
[0006]
[Problems to be solved by the invention]
However, for example, when the cleaning impeller 22 is rotated in a predetermined direction for cleaning, the drain impeller 23 rotates in the reverse direction, so that the drain pump chamber 102 sucks water from the discharge port, that is, the drain hose 11 side. There is a risk of inhaling up to the air together with water, so-called air biting. In order to prevent such air biting, in the dishwasher described in JP-A-11-128145, a check valve is provided in the drainage channel to prevent water from flowing in the direction opposite to the drainage direction. Yes.
[0007]
FIG. 15 is a schematic cross-sectional view showing the check valve mounting structure. A cylindrical case 81 is fitted into the end of the drainage hose 80 connected to the discharge port 42 of the drainage pump chamber 102, and a cylindrical cap 84 is fitted via a sealing O-ring 82. A drainage hose 11 communicating with the outside of the machine is connected to the cap 84. A support base portion of a valve body 83 made of an elastic member is sandwiched between the case 81 and the cap 84. During draining operation, the valve body 83 is centered on the support base portion as shown by a two-dot chain line in FIG. The drainage channel is opened by butterflies. In other cases, the pressure of water accumulated on the upper valve chamber side is seated on the valve seat inside the case 81 to prevent water from flowing backward.
[0008]
However, in order to provide the check valve having the above structure, the drainage hose is divided into two (drainage hoses 80 and 11), and a check valve comprising a case 81, a cap 84, a valve body 83, and an O-ring 82 is provided in the middle. The cost will be higher by that amount. Therefore, there is a demand for a low-cost structure with a smaller number of parts than such a conventional one.
[0009]
Moreover, the dishwasher as described above requires a considerably large installation space. On the other hand, in recent years, dishwashers with a small depth that can be installed in a narrow space beside a sink (sink) have become commercially available. In such a dishwasher, the washing / 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 it 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 / drainage pump 10 with a flexible hose or the like, but this is preferable in terms of cost because the number of parts increases. Absent. Therefore, a washing and draining pump having a structure and shape suitable for such an arrangement is desired.
[0010]
The present invention has been made to solve these problems, and a first object of the present invention is to provide a check having a structure capable of reducing the cost when a check valve is provided in the drainage channel. The object is to provide a dishwasher with a valve. Further, the 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. An object of the present invention is to provide a dishwasher equipped with a washing and draining pump.
[0011]
[Means for Solving the Problems and Effects of the Invention]
The dishwasher according to the first aspect of the present invention, which has been made to solve the above-mentioned problems, is sucked from the center front of the washing impeller as a washing pump that sucks water stored in the bottom of the washing cabinet and ejects it from the nozzle into the washing cabinet. In the dishwasher using the centrifugal pump that pushes out the water to the outer peripheral side, the washing pump chamber has a casing that forms the outer shape of the washing pump chamber with the washing impeller disposed therein, A suction pipe that bends and extends in an L shape from the front center of the casing; a discharge pipe that is formed on a peripheral surface of the casing; and a front surface of the cleaning impeller at a root of the suction pipe in the casing. An extension base having the smallest separation distance, a flow passage gradually increasing the cross-sectional area toward the discharge pipe around the extension base, and the root of the suction pipe A flat portion formed on the front surface of the casing at a portion sandwiched between the front surface of the cleaning impeller and the suction pipe among the extended base portions, and a flat portion having the same height as the front wall of the adjacent flow path, and the extended base portion A recess formed inwardly on the front surface of the casing other than a portion sandwiched between the front surface of the cleaning impeller and the suction pipe, and a small number from the cleaning pump chamber side on the inner wall surface of the flat portion. And a rib erected so that the recess is formed .
[0016]
According to this configuration, the portion sandwiched between the front wall of the casing and the suction pipe does not have a recess and is formed substantially flush with the outer surface of the adjacent flow path. In addition, the mold can be removed in a direction substantially orthogonal to the end face opening of the suction pipe. If the thick part between the outer surface and the inner surface remains as it is, it tends to be defective during molding, but by forming ribs, the extreme wall thickness is substantially eliminated. As such, such defects are less likely to occur. In addition, if the thick part is simply hollowed out without forming a rib, the water sucked through the suction pipe becomes turbulent in that part, and the pump performance may be deteriorated. Therefore, a large turbulent flow is not generated and the pump performance is not deteriorated. Further, since the suction pipe is bent in a substantially L shape, even if this washing pump is arranged to extend in the width direction with respect to the machine frame, the suction pipe is sucked into the circulation port of the storage tank located in front of it. Pipes can be connected directly.
[0017]
One embodiment of the dishwasher according to the first invention, the washing pump, a cleaning operation for jetting into the wash chamber from the nozzle water reserved in the wash chamber bottom was aspirated and stored in the wash chamber bottom water The draining operation of sucking out and discharging to the outside through the drainage channel is realized as 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 cleaning-side casing forming the outer shape of the cleaning pump chamber, a drainage-side casing forming the outer shape of the drainage pump chamber, and a partition partitioning the cleaning pump chamber and the drainage pump chamber, and the suction pipe and the discharge pipe in the cleaning side casing Can be provided.
[0018]
In addition, if the shape of the rib is, for example, a lattice shape, the shape of the mold is not complicated.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
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 the dishwasher according to the present embodiment. This dishwasher has a thin structure with a small depth so that it can be installed in a narrow space on the side of a kitchen sink, for example. The same reference numerals are given to the same or corresponding parts as in FIG.
[0020]
In the dishwasher, an upper door 3a and a lower door 3b that are pivotally supported at the upper and lower ends of the front opening of the washing cabinet 2 are opened while rotating in the directions of arrows a and b in FIG. It is attached as follows. A rotatable arm 4 having a plurality of nozzles 5 formed on the upper surface is provided at the bottom of the cleaning cabinet 2. In this dishwasher, since the width of the washing cabinet 2 is larger than the depth, water does not reach the both sides of the washing cabinet 2 with only one arm. Therefore, another arm (not shown) is provided in a position where it does not interfere with the arm 4 during rotation.
[0021]
A washing and draining pump 10 is disposed below the bottom surface of the washing cabinet 2. A cleaning pump chamber (not shown in FIG. 1) of the cleaning and 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 that extends in the horizontal direction. The water passage 14 communicates with a water passage in the arm 4 (and a water passage in another arm not shown). Similarly, a drain pump chamber (not shown) is connected to the drain port 8 via a drain side suction pipe (not shown), and the drain side discharge pipe 42 communicates with the outside of the machine via a drain hose. When the pump motor of the washing and draining pump 10 is driven to rotate in the forward direction, the water sucked from the water storage tank 6 through the circulation port 7 is pumped to the arm 4 by the action of the washing impeller, as will be 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 drain port 8 is discharged to the outside through the drain hose by the action of the drain impeller.
[0022]
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 washing / drainage pump 10 includes a casing 24 that divides the washing pump chamber 101 and the drainage pump chamber 102 inside, a pump motor 20 that can be driven to rotate in the forward and reverse directions, and a pump motor inside the washing pump chamber 101. 20 includes a cleaning impeller 22 attached to the rotary shaft 21 and a drain impeller 23 attached to the rotary shaft 21 in the drainage pump chamber 102.
[0023]
The casing 24 includes a cleaning side casing 30, a drainage side casing 40, and a partition wall 25 sandwiched between the casings 30 and 40. The rotating shaft 21 of the motor 20 passes through the drain side casing 40 and the partition wall 25. Between the back surface of the cleaning impeller 22 and the partition wall 25, and between the drainage impeller 23 and the partition wall 25, a concave portion and a convex portion are formed in a predetermined shape with an appropriate gap, so-called labyrinth coupling is formed. is doing. Thereby, high liquid tightness between the cleaning pump chamber 101 and the drainage pump chamber 102 is achieved. In addition, the material which forms the casing 24 considers robustness and durability, and a plastic mixed with a reinforcing material such as glass fiber, for example, a polypropylene resin containing glass fiber is used.
[0024]
The cleaning-side casing 30 has a cleaning-side suction pipe 31 formed in a cleaning-side suction pipe 31 that extends and bends in an L shape from the center of the front surface, and a cleaning-side discharge pipe 32 that extends straightly upward from the right part of the peripheral surface. And a cleaning-side discharge port. The cleaning impeller 22 has a plurality of spiral wings 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, the central portion It functions as a centrifugal pump that pushes out water drawn from the front to the outer periphery. That is, the water sucked from the cleaning side suction port is discharged from the cleaning side discharge port.
[0025]
On the other hand, the drainage side casing 40 is connected to a drainage side suction port formed in a drainage side suction pipe 41 extending in a straight tube shape in the horizontal and lateral directions, and a drainage side discharge pipe 42 extending in a straight tube shape obliquely upward from the left part of the peripheral surface. And a formed drainage-side discharge port. The drainage impeller 23 is provided with a plurality of wings radially around the front surface of a flat disk-shaped substrate. When the drainage impeller 23 is rotated in a predetermined direction, the water sucked from the side is along the outer periphery. It functions as a vortex pump that pushes away to the side. That is, the water sucked from the drain side suction port is discharged from the drain side discharge port.
[0026]
4A and 4B are external views of the washing-side casing 30, wherein FIG. 4A is a front view and FIG. 4B is a side view. FIG. 5 is a cross-sectional view taken along line AA ′ in FIG. FIG. 6 is a cross-sectional view taken along line BB ′ in FIG. FIG. 7 is a rear view of the cleaning side casing 30.
[0027]
As described above, the cleaning pump is a centrifugal pump. In the centrifugal pump, the distance from the front surface of the cleaning impeller 22 is minimized at the base 33 of the base of the cleaning side suction pipe 31, and the cross-sectional area of the flow path 34 is gradually increased toward the cleaning side discharge pipe 32. Therefore, the extension base 33 is formed as a recess recessed inward, and the flow path 34 disposed in a spiral shape around the extension base 33 cleans its width (that is, the interval between the outer peripheral wall 342 and the inner peripheral wall 343). While gradually widening toward the side discharge pipe 32 (see FIG. 6), the front wall 341 has a shape in which forward bulging is gradually increased.
[0028]
In order to form such a bent cleaning side suction pipe 31 using a mold, P1 and P2 in FIG. 5 are set as part parts (that is, close contact parts of a plurality of molds), and the right direction (indicated by an arrow Pa). It is necessary to remove the mold in the direction). For this purpose, the above-described recess cannot be left in the extending base 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), defects are likely to occur during resin molding.
[0029]
Therefore, in the present dishwasher, as shown in FIGS. 5 and 7, lattice-like ribs 351 are provided on the inner wall surface of the flat portion 35 so as not to be extremely thick. If this portion is not provided with the ribs 351 and the inside is made a hollow portion, the water sucked through the cleaning-side suction pipe 31 generates turbulent flow in the hollow portion, which lowers the suction performance of the pump. On the other hand, by providing ribs 351 having a narrow lattice interval as in the present embodiment, the occurrence of turbulence is prevented to avoid significant deterioration of the pump performance, and the above-described defects at the time of molding. Can also be prevented.
[0030]
Next, the structure of the check valve, which is another feature of the present invention, will be described. In the dishwasher according to the present embodiment, a check valve is integrally provided in the drain side casing 40 of the washing and draining pump 10 described above.
[0031]
8 and 9 are a top view and a front view showing the appearance of the drain side casing 40, FIGS. 10 (a) and 10 (b) are cross-sectional views taken along lines CC ′ and DD ′ in FIG. (A) is a side view, FIG.11 (b) is the EE 'sectional view taken on the line in FIG. FIG. 12 is a partial sectional view showing the structure of the check valve.
[0032]
As described above, the drain side casing 40 is formed by extending the drain side discharge pipe 42 obliquely upward from the substantially cylindrical side peripheral wall 43. In the discharge pipe 42, a cylindrical check valve case 422 having a larger diameter than that of the pipe 41 is integrally formed at the 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. The cap member 51 includes a large-diameter portion 511 that fits inside the check valve case 422 and a pipe 512 that is integrally formed on the upper portion and bent in an L shape. Inside the check valve case 422, an O-ring 53 is interposed as a seal member, and the large-diameter portion 511 of the cap member 51 is fitted. A valve seat 423 is formed in an annular shape on the upper end surface inside the check valve case 422. Although not shown, a drainage hose communicating with the outside of the machine is connected to the tip of the pipe 512 of the cap member 51.
[0033]
The valve member 52 is formed of a flexible elastic member such as rubber, and a valve body 521 having a size capable of closing the flow path by contacting the valve seat 423 formed on the check valve case 422; A support base 522 is provided at one end of the valve body 521 and supports the valve body 521 with respect to the valve seat 423 so that the valve body 521 can be opened and closed. The support base 522 and the end face of the large-diameter portion 511 of the cap member 51 It is clamped by the inner end face of 422.
[0034]
The valve body 521 rotates around the support base 522 as a fulcrum, and opens and closes the flow path. That is, when there is no discharge of water from the drainage pump chamber 102, the valve body 521 is brought into close contact with the valve seat 423 by the elastic restoring force and gravity of the support base 522 (state shown by a solid line in FIG. 12). ). This prevents water from flowing backward from the flow path above the valve body 521 downward, that is, to the drainage 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 is opened by rotating the support base 522 as a fulcrum by the pressure of the water (see FIG. 12). The state indicated by the dotted line), water flows from the drainage discharge pipe 42 side to the cap member 51 side.
[0035]
As described above, in the dishwasher according to the present embodiment, the check valve case 422 which is one member constituting the check valve 50 is integrated with the drain side casing 40, and thus, conventionally, a separate member from the drain side casing. The check valve case and the hose for connecting the check valve case and the drainage discharge pipe are not required. Therefore, the number of parts can be reduced as compared with the conventional configuration, and the cost can be reduced.
[0036]
A plurality of molds are also used when the drain side casing 40 is molded. In order to form the drain side discharge pipe 42, a mold having P4 in FIG. 10 as a part part is used. The mold is pulled out in the direction of arrow Pb in FIG. As shown in FIG. 10B, a wedge-shaped gap is formed between the outer peripheral surface of the pipe 421 and the flange portion 44 in the connection portion 424 between the flange portion 44 and the pipe 421 that protrudes further outward from the side peripheral wall 43. It has a shape that does not occur. Therefore, as described above, the mold can be smoothly removed in the direction of the arrow Pb.
[0037]
By the way, in this dishwasher, a heater is disposed at the inner bottom of the washing cabinet 2 so that the water stored in the bottom of the washing cabinet 2 can be heated when washing is too easy, and the washing cabinet is used when drying. The air in 2 can be heated. In addition, a thermistor for temperature detection and a temperature fuse for overheating detection are provided outside the bottom surface of the cleaning cabinet 2 so that heating control can be performed at this time.
[0038]
FIG. 13 is a view showing the mounting structure of the thermistor and the thermal fuse, (a) is a top view of the holder 60 for mounting, and (b) is a state in which the holder 60 is mounted on the bottom wall of the cleaning cabinet. It is FF 'sectional view taken on the line.
[0039]
The holder 60 as a whole has a substantially L-shaped side surface, a screw hole 61 on the lower surface, a claw 62 capable of detachably holding the thermistor 70 on the standing surface, and a mounting opening 63 for the thermal fuse 71. A spring-like portion 64 is formed so as to protrude rearward. 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 erected downward on the bottom wall 201. A rib 204 protrudes downward at a predetermined portion of the horizontal wall 204 that is one step higher from the bottom wall 201 through the vertical wall 203. Reference numeral 206 denotes a heater.
[0040]
When the holder 60 is attached to the corner of the bottom wall of the cleaning cabinet 2, as shown in FIG. 13B, the spring-like portion 64 is pushed into the gap between the vertical wall 203 and the rib 205, and the thermistor 70 and the thermal fuse are inserted. 71 is brought into close contact with the vertical wall 203, and a screw 72 is inserted into the screw hole 61 from below to be screwed into the screw hole of the boss 202. The upper portion of the holder 60 is firmly fixed by pressing the spring-like portion 64 against the rib 204, and the thermistor 70 and the thermal fuse 71 are securely in close contact with the vertical wall 203 due to the bending of the spring-like portion 64.
[0041]
The above-described embodiment is merely an example, and it is obvious that modifications and changes can be made as appropriate within the scope of the gist 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 present embodiment.
FIG. 3 is a front view of a washing and draining pump in the dishwasher of the present 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 cross-sectional view taken along line AA ′ in FIG.
6 is a cross-sectional view taken along the line BB ′ in FIG.
FIG. 7 is an external rear view of a cleaning casing of the main cleaning and drainage pump.
FIG. 8 is a top view of the appearance of a drain side casing of the main cleaning and drainage pump.
FIG. 9 is an external front view of a drain side casing of the main cleaning and drainage pump.
10 is a sectional view taken along line CC ′ in FIG. 9 (a) and a sectional view taken along line DD ′ (b).
FIG. 11 is an external side view (a) of a drainage side casing of the main cleaning and drainage pump, and a cross-sectional view taken along line EE ′ in FIG. 9 (b).
FIG. 12 is a partial cross-sectional view showing the structure of a check valve in the dishwasher of this embodiment.
FIGS. 13A and 13B are a top view and a cross-sectional view taken along line FF ′ showing a structure for mounting a temperature detection unit in the dishwasher according to the present embodiment. FIGS.
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 chamber 102 ... Drain pump chamber 20 ... Pump motor 21 ... Rotating shaft 22 ... Cleaning impeller 23 ... Drainage impeller 24 ... Casing 25 ... Partition 30 ... Cleaning side casing 31 ... Cleaning side suction pipe 32 ... cleaning side discharge pipe 33 ... extension base 34 ... flow path 341 ... front wall 342 ... outer peripheral wall 343 ... inner peripheral wall 35 ... flat portion 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 ... collar 50 ... check valve 51 ... cap member 511 ... large diameter part 512 ... pipe 52 ... valve member 521 ... valve body 522 ... support base 53 ... O-ring

Claims (3)

As a washing pump that sucks water stored in the bottom of the washing cabinet and ejects it from the nozzle into the washing cabinet, in a dishwasher using a spiral pump that pushes the water sucked from the center front of the washing impeller to the outer peripheral side,
The cleaning pump chamber has the casing that forms the outer shape of the cleaning pump chamber, with the cleaning impeller disposed therein.
Also, the casing is
A suction pipe that bends and extends in an L-shape from the front center of the casing;
A discharge pipe formed on the peripheral surface of the casing;
An extension base that has the smallest separation distance from the front surface of the cleaning impeller at the root of the suction pipe of the casing;
A flow path that gradually increases the cross-sectional area toward the discharge pipe around the extended base;
A flat portion formed on the front surface of the casing at a portion sandwiched between the front surface of the cleaning impeller and the suction pipe among the extended base portion of the root of the suction pipe, and a flat portion whose height is aligned with the front wall of the adjacent flow path; ,
On the front surface of the casing other than the portion sandwiched between the front surface of the cleaning impeller and the suction pipe of the extended base, a recess formed to be recessed inwardly;
Ribs erected on the inner wall surface of the flat portion so that a large number of small recesses are formed from the cleaning pump chamber side;
Dishwasher characterized in that it comprises a.   The cleaning pump sucks the water stored in the bottom of the cleaning cabinet and ejects it from the nozzle into the cleaning cabinet, and sucks the water stored in the bottom of the cleaning cabinet and discharges it outside the machine through the drainage channel. The draining operation is realized as a part of a cleaning and draining pump that is selectively performed by switching the rotation direction of a single motor, and the casing is a cleaning side casing that forms the outer shape of the cleaning pump chamber, a drain pump chamber 2. The dishwashing apparatus according to claim 1, further comprising: a drainage-side casing having an outer shape; and a partition wall partitioning the washing pump chamber and the drainage pump chamber, wherein the suction pipe and the discharge pipe are provided in the washing side casing. Machine.   The dishwasher according to claim 1 or 2, wherein the rib has a lattice shape.

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