CN114073479A

CN114073479A - Dish washer drainage device and dish washer

Info

Publication number: CN114073479A
Application number: CN202010852376.0A
Authority: CN
Inventors: 苏春会; 许绍炮
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2022-02-22
Anticipated expiration: 2040-08-21
Also published as: CN114073479B

Abstract

The invention belongs to the technical field of kitchen equipment, and particularly relates to a drainage device of a dish-washing machine and the dish-washing machine. The drainage device of the dish washing machine comprises a piston pump and a connecting rod assembly, wherein the piston pump comprises a pump body and a piston rod assembly matched with the pump body, a water inlet and a water outlet which are communicated with the bottom of an inner cavity of the pump body are formed in the pump body, the water inlet is communicated with the bottom of a water cup of the dish washing machine, the water outlet is communicated with a drainage pipe of the dish washing machine, the connecting rod assembly is used for connecting a door body of the dish washing machine and the piston rod assembly, and the connecting rod assembly is used for driving the piston rod assembly to reciprocate along the axis direction of the connecting rod assembly. According to the drainage device of the dish washing machine, residual washing water in the water cup can be drained in the opening and closing processes of the door body, so that the washing and internal drying effects of the dish washing machine are improved, the generation of peculiar smell in the dish washing machine is reduced, the overall performance of the dish washing machine is improved, and the user experience is improved.

Description

Dish washer drainage device and dish washer

Technical Field

The invention belongs to the technical field of kitchen equipment, and particularly relates to a drainage device of a dish-washing machine and the dish-washing machine.

Background

The dish washer is a device for washing dishes by spraying high pressure washing water through a nozzle, and generally comprises a dish washer body forming a washing chamber, wherein a dish inlet is arranged in front of the dish washer body, a door cover is arranged at the dish inlet, and a dish shelf and the like are arranged in the washing chamber. In the washing process of the dish washing machine, washing circulating water flows into the washing pump through the water cup and is sprayed out of the washing dish through the spraying arm, the washed water flows back to the water cup, and meanwhile, the water washed in the water cup is discharged under the action of the water discharging pump. The existing dish-washing machine consumes a lot of water, and the residual water in the water cup is large in the water drainage process. Because of the restriction in part volume and chassis space, the drain pump can not install the extreme low position at the drinking cup, after the drainage process, there is a certain amount of residual water in the cavity of drinking cup bottom and drain pump to influence the washing and the inside drying effect of dish washer, and because waste water remains for a long time and can produce the peculiar smell in the organism, influence user experience, and influenced the complete machine performance of dish washer.

Disclosure of Invention

The invention aims to at least solve the problem of residual washing water in a cup after the water is drained by a dishwasher. This object is achieved by:

a first aspect of the present invention provides a drain device for a dishwasher, the drain device comprising:

the piston pump comprises a pump body and a piston rod assembly matched with the pump body, wherein the pump body is provided with a water inlet and a water outlet which are communicated with the bottom of an inner cavity of the pump body, the water inlet is communicated with the bottom of a water cup of the dish washing machine, and the water outlet is communicated with a drain pipe of the dish washing machine;

the connecting rod assembly is used for connecting a door body of the dishwasher and the piston rod assembly and is used for driving the piston rod assembly to reciprocate along the axis direction of the connecting rod assembly.

According to the drainage device of the dish washing machine, the bottom of a water cup of the dish washing machine is communicated with a drainage pipe through a pump body of a piston pump, the door body of the dish washing machine is connected with a piston rod assembly through a connecting rod assembly, when the door body of the dish washing machine is in an opening process, the door body pulls the piston rod assembly to move towards a direction far away from the pump body and generates suction in an inner cavity of the pump body, so that residual washing water in the water cup is sucked into the inner cavity of the pump body through a water inlet, when the door body is in a closing process, the door body pushes the piston rod assembly to move towards a direction close to the pump body and generates thrust in the inner cavity of the pump body, so that the residual washing water sucked in the pump body is discharged out of the pump body through a water outlet and finally discharged out of the dish washing machine through the drainage pipe, and further the washing and internal drying effects of the dish washing machine are improved, the peculiar smell in the dish washer is reduced, the overall performance of the dish washer is improved, and the experience of customers is improved.

In addition, the drain device of the dishwasher according to the present invention may further have the following additional technical features:

in some embodiments of the present invention, the connecting rod assembly at least includes a first connecting rod, a second connecting rod and a third connecting rod, two ends of the first connecting rod are respectively connected to the door body and one end of the second connecting rod, the other end of the second connecting rod is rotatably connected to the dishwasher, one end of the third connecting rod is connected to the second connecting rod, and the other end of the third connecting rod is connected to the piston rod assembly or connected to one end of the piston rod assembly through a fourth connecting rod.

In some embodiments of the present invention, the dishwasher drain further comprises a guide assembly comprising:

the bracket is provided with a guide groove;

a slider slidably coupled to the guide groove;

the piston rod assembly is consistent with the arrangement direction of the guide groove, and one end of the piston rod assembly is connected with the sliding block or is connected with the sliding block through the fourth connecting rod.

In some embodiments of the invention, the second link further comprises a bent portion, and a connection point of the third link and the second link is provided between the bent portion and the one end of the second link.

In some embodiments of the present invention, the piston rod assembly includes a push rod and a rubber plug, the rubber plug is in fit connection with the inner cavity of the pump body, and the push rod is used for connecting the connecting rod assembly and the rubber plug.

In some embodiments of the present invention, the dishwasher drain device further comprises a water inlet pipe and a water outlet pipe, the water inlet pipe being in communication with the water inlet, the water outlet pipe being in communication with the water outlet.

In some embodiments of the invention, the water inlet pipe is provided with a first one-way valve, the water outlet pipe is provided with a second one-way valve, the opening direction of the first one-way valve is set to face the inflow direction of the piston pump, and the opening direction of the second one-way valve is set to be opposite to the outflow direction of the piston pump.

In some embodiments of the present invention, the water inlet is provided above the water outlet in a height direction of the dishwasher.

In another aspect of the present invention, there is also provided a dishwasher having:

a door body;

the dishwasher drain device of any of the above;

the connecting rod assembly is connected with the door body and the piston rod assembly.

In some embodiments of the invention, the dishwasher drain is disposed at an interior bottom of the dishwasher.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. Wherein:

FIG. 1 is a partial structural diagram of a dishwasher according to an embodiment of the present invention in a state where a door is closed;

FIG. 2 is a schematic sectional view taken along line A-A of the dishwasher of FIG. 1;

FIG. 3 is a partial schematic structural view of the dishwasher in FIG. 1 with the door open;

FIG. 4 is a schematic view of a cross-sectional view B-B of the dishwasher of FIG. 3;

FIG. 5 is a schematic view of a portion of the drain of the dishwasher of FIG. 3;

FIG. 6 is a partial schematic structural view of another perspective of the drain mechanism of the dishwasher of FIG. 5;

FIG. 7 is a schematic view of a portion of the first link of FIG. 5;

FIG. 8 is a schematic view of a portion of the second link of FIG. 5;

FIG. 9 is a schematic view of a portion of the third link of FIG. 5;

FIG. 10 is a schematic view of a portion of the fourth link of FIG. 5;

FIG. 11 is a schematic view of a portion of the pump body of FIG. 5;

FIG. 12 is a schematic view of a portion of the piston rod assembly of FIG. 5;

FIG. 13 is a schematic view of a portion of the stent of FIG. 5;

FIG. 14 is a schematic view of a portion of the slider of FIG. 5;

FIG. 15 is a schematic view of a portion of the inlet pipe of FIG. 5;

fig. 16 is a partial structural view of the drain pipe of fig. 5.

The reference numerals in the drawings denote the following:

100: a dishwasher drain;

10: piston pump, 11: pump body, 12: piston rod assembly, 121: push rod, 122: rubber plug, 13: water inlet, 14: water outlet, 15: a fixed part;

20: connecting rod assembly, 21: first link, 211: first connection hole, 212: second connection hole, 22: second link, 221: third connection hole, 222: fourth connection hole, 223: fifth connection hole, 224: bending section, 23: third link, 231: sixth connection hole, 232: seventh connection hole, 24: fourth link, 241: eighth connection hole, 242: a ninth connection hole;

30: guide assembly, 31: bracket, 311: support body, 312: guide groove, 313: mounting portion, 32: slider, 33: a pin shaft;

40: inlet tube, 41: a first check valve;

50: water outlet pipe, 51: a second one-way valve;

200: a cavity;

300: door body, 310: a door hinge;

1000: a dishwasher.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Referring to fig. 1 to 5, the present embodiment provides a dishwasher 1000, and the dishwasher 100 includes a chamber 200, a door 300, a cup (not shown), and a dishwasher drain 100. The door 300 of the present embodiment is connected to the machine body through a door hinge 310, so that the door 300 is rotatably disposed at the opening of the cavity 200, and the tableware can be placed in or taken out of the cavity 200 through the door 300. The water cup is communicated with the inside of the cavity 200 for circularly delivering washing water to the inside of the cavity 200, thereby washing the dishes. The cavity 200 is further provided at the outside thereof with a drain pump (not shown), which is connected to a drain pipe for draining the washing water in the water cup, and most of the washing water in the water cup can be drained by the drain pump. However, the residual washing water remains in the cup, and the drainage device 100 of the dishwasher of the present embodiment is used to drain the residual washing water in the cup. In order to facilitate the discharge of all the washing water remaining in the water cup, the drain device 100 of the dishwasher of the present embodiment is provided at the inner bottom of the dishwasher 1000, i.e., below the cavity 200.

Referring to fig. 4 and 6, a drain device 100 of a dishwasher according to the present embodiment includes a piston pump 10 and a link assembly 20. The piston pump 10 comprises a pump body 11 and a piston rod assembly 12 matched with the pump body 11, wherein a water inlet 13 and a water outlet 14 which are communicated with the bottom of an inner cavity of the pump body 11 are arranged on the pump body 11, the water inlet 13 is communicated with the bottom of a water cup of the dish washing machine 1000, the water outlet 14 is communicated with a drain pipe of the dish washing machine 1000, a connecting rod assembly 20 is used for connecting a door body 300 of the dish washing machine 1000 and the piston rod assembly 12, and the connecting rod assembly 20 is used for driving the piston rod assembly 12 to reciprocate along the axis direction of the connecting rod assembly 20.

According to the drainage device 100 of the dishwasher, the pump body 11 of the piston pump 10 is communicated with the bottom of the cup of the dishwasher 1000 and the drainage pipe, and the door 300 of the dishwasher 1000 and the piston rod assembly 12 are connected through the connecting rod assembly 20, when the door 300 of the dishwasher 1000 is in the opening process, the door 300 pulls the piston rod assembly 12 to move towards the direction far away from the pump body 11 and generates suction in the inner cavity of the pump body 11, so that residual washing water in the cup is sucked into the inner cavity of the pump body 11 through the water inlet 13, when the door 300 is in the closing process, the door 300 pushes the piston rod assembly 12 to move towards the direction close to the pump body 11 and generates thrust in the inner cavity of the pump body 11, so that the residual washing water sucked in the pump body 11 is drained out of the pump body 11 through the water outlet 14 and finally drained out of the dishwasher 1000 through the drainage pipe, so that the residual washing water in the cup is drained in the opening and closing processes of the door 300, thereby improving the washing and internal drying effects of the dishwasher 1000, reducing the generation of peculiar smell in the dishwasher 1000, improving the overall performance of the dishwasher 1000, and improving the experience of customers.

As shown in fig. 5 to 10, the link assembly 20 of the present embodiment includes a first link 21, a second link 22, a third link 23, and a fourth link 24. Both ends of the first link 21 are connected to the door 300 and one end of the second link 22, respectively. Specifically, both ends of the first link 21 are respectively provided with a first connection hole 211 and a second connection hole 212, the first connection hole 211 is rotatably connected to the end of the door hinge 310 of the door body 300 by a connection pin, one end of the second link 22 is provided with a third connection hole 221, and the second connection hole 212 and the third connection hole 221 are rotatably connected together by a connection pin. The other end of the second link 22 is further provided with a fourth connection hole 222, and the fourth connection hole 222 is connected to the bottom of the body of the dishwasher 1000 by a connection pin, so that the second link 22 can rotate around the axis direction of the fourth connection hole 222 under the driving of the first link 21. Both ends of the third link 23 are respectively provided with a sixth connecting hole 231 and a seventh connecting hole 232, a fifth connecting hole 223 is arranged on the second link 22 near the third connecting hole 221, and the sixth connecting hole 231 and the fifth connecting hole 223 are connected by a connecting pin, so that the third link 23 can rotate around the axial direction of the fifth connecting hole 223 and the sixth connecting hole 231 under the driving of the second link 22. The two ends of the fourth connecting rod 24 are respectively provided with an eighth connecting hole 241 and a ninth connecting hole 242, wherein the eighth connecting hole 241 is connected with the seventh connecting hole 232 through a connecting pin, the ninth connecting hole 242 is connected with one end of the piston rod assembly 12, so that the fourth connecting rod 24 can drive the piston rod assembly 12 to reciprocate along the self axis direction under the driving of the third connecting rod 23, thereby connecting the door body 300 and the piston rod assembly 12 through the connecting rod assembly 20, converting the opening and closing action of the door body 300 into the reciprocating motion of the piston rod assembly 12 along the self axis, and discharging the residual washing water in the water cup through the drainage device 100 of the dishwasher of the embodiment.

As shown in fig. 8, the second link 22 of the present embodiment further includes a bent portion 224, and a fifth connection hole 223 is provided between the bent portion 224 and the third connection hole 221. The bent portion 224 in this embodiment is an arc-shaped structure, and the bent portion 224 is disposed to avoid interference of other components in the dishwasher 1000 during rotation of the second link 22, so as to prevent the second link 22 from touching other components during rotation, thereby affecting movement of the piston rod assembly 12. Meanwhile, the bent portion 224 can also increase the deformable amount of the second link 22, so that the second link 22 has a certain deformable space under the extrusion of the first link 21 and the third link 23, thereby increasing the strength of the second link 22 and preventing the second link 22 from being broken.

Referring to fig. 5, 11 and 12, the drain device 100 of the dishwasher of the present embodiment further includes a guide assembly 30, and the guide assembly 30 includes a bracket 31 and a slider 32. The bracket 31 includes a bracket body 311 and a guide groove 312 provided at one end of the bracket body 311, the other end of the bracket body 311 is used for mounting the piston pump 10, and a mounting portion 313 for mounting the pump body 11 is correspondingly provided, and the slider 32 is slidably provided in the guide groove 312. The guide groove 312 of the present embodiment is a T-shaped groove, and the entire slider 32 has a structure in which the size of the middle portion is large and the size of the portion near the edge is small. The two ends of the sliding block 32 are inserted into the two end grooves of the guide groove 312, and the middle part of the sliding block 32 protrudes out of the guide groove 312, so that the sliding process of the sliding block 32 in the guide groove 312 is realized. The slide block 32 is provided with a connecting pin mounting position, and the third connecting rod 23 and the fourth connecting rod 24 are both connected to the slide block 32 in a rotatable manner through the same pin shaft 33. Since the slide block 32 moves linearly in the guide groove 312 along the direction of the guide groove 312, the fourth link 24 can drive the piston rod assembly 12 to reciprocate in the linear direction under the driving of the third link 23.

Referring to fig. 5, 13, and 14, the piston pump 10 of the present embodiment includes a pump body 11 and a piston rod assembly 12. An inner cavity used for being matched with the piston rod assembly 12 to generate pressure is arranged in the pump body 11, a water inlet 13 and a water outlet 14 communicated with the bottom of the inner cavity of the pump body 11 are arranged at a position close to the bottom of the inner cavity of the pump body 11 (namely, the right end of the position of the pump body shown in fig. 5), a fixing part 15 is further arranged outside the pump body 11, and the fixing part 15 is connected to the mounting part 313 of the support body 311 through screws, so that the pump body 11 is fixed on the support body 311. The piston rod assembly 12 includes a push rod 121 and a rubber stopper 122, the rubber stopper 122 is fittingly connected with the inner cavity of the pump body 11, and can generate a certain pressure to the inner cavity of the pump body 11 during the movement of the rubber stopper 122, so as to suck and discharge the washing water. The push rod 121 is used to connect the connecting rod assembly 20 and the rubber stopper 122. The other end of the push rod 121 corresponding to the rubber plug 122 is provided with a mounting hole, and the mounting hole is connected to the ninth connecting hole 242 on the fourth connecting rod 24 through a connecting pin, so that the push rod 121 and the rubber plug 122 are driven by the fourth connecting rod 24 to move along a linear direction. In order to ensure that the piston rod assembly 12 reciprocates in a linear direction under the driving of the connecting rod assembly 20, the piston rod assembly 12 of the present embodiment is disposed in the same direction as the guide groove 312.

In the embodiment, the slider 32 and the push rod 121 are connected through the fourth link 24, so that inconvenience in connection and installation caused by inconsistent thicknesses of the push rod 121 and the slider 32 is avoided, and the push rod 121 and the slider 32 are conveniently connected.

In other embodiments of the present application, the mounting hole of the push rod 121 may be connected to the seventh connecting hole 232 of the third link 23 through a connecting pin, and the push rod 121 is directly driven to move by the third link 23, so that the arrangement of the fourth link 24 is reduced, and the process of draining the residual washing water in the water cup can also be completed.

The above combination of the connecting rods is only one embodiment of the connecting rod assembly 20 of the present invention, and there may be many other combinations of the connecting rod assembly 20, which will not be illustrated herein, but it should be understood that any combination of the connecting rods that drive the movement of the piston rod assembly 12 via the connecting rod assembly is within the scope of the present invention.

Referring to fig. 5, 15 and 16, the drainage device 100 of the dishwasher of the present embodiment further includes a water inlet pipe 40, one end of the water inlet pipe 40 is communicated with the water inlet 13, and the other end of the water inlet pipe 40 is communicated with the bottom of the water cup, so that during the opening process of the door 300, the connecting rod assembly 20 pulls the piston rod assembly 12 to move towards the bottom of the inner cavity far away from the pump body 11, and generates a suction force in the inner cavity of the pump body 11, thereby sucking the residual washing water in the water cup into the inner cavity of the pump body 10 through the water inlet pipe 40. The drainage device 100 of the dishwasher of the present embodiment further includes a water inlet and outlet pipe 50, one end of the water outlet pipe 50 is connected to the water outlet 14, and the other end of the water outlet pipe 50 is connected to the drainage pipe of the dishwasher 1000, so that in the closing process of the door 300, the door 300 pushes the piston rod assembly 12 to move towards the bottom of the inner cavity of the pump body 11, and generates thrust in the inner cavity of the pump body 11, and then discharges the residual washing water sucked in the pump body 11 out of the pump body 11 through the water outlet pipe 50, and finally discharges the washing water out of the dishwasher 1000 through the drainage pipe. Through opening and closing at door body 300 in-process to remaining washing water discharge in the drinking cup, improved dish washer 1000's washing and inside drying effect, reduce the production of peculiar smell in dish washer 1000, improve dish washer 1000's wholeness ability, improve customer experience and feel.

As shown in fig. 15, the inlet pipe 40 of the present embodiment is provided with a first check valve 41, and the opening direction of the first check valve 41 is set to be directed toward the inflow direction of the piston pump 10. The direction of the arrow on the first check valve 41 in fig. 15 is the inflow direction of the washing water, so as to ensure that the washing water in the water inlet pipe 40 can only flow into the pump body 10 and can not flow back into the cup.

As shown in fig. 16, the outlet pipe 50 of the present embodiment is provided with a second check valve 51, and the opening direction of the second check valve 51 is set to be opposite to the direction in which the piston pump 10 flows out. The direction of the arrow on the second check valve 51 in fig. 16 is the outflow direction of the washing water, so as to ensure that the washing water in the outlet pipe 50 can only flow into the outlet pipe, but not flow back into the pump body 10.

As shown in fig. 5, in the embodiment, the water inlet 13 is disposed above the water outlet 14 along the height direction of the dishwasher 1000, so as to further ensure that the washing water in the pump body 11 is firstly discharged into the water outlet pipe 50 through the water outlet 14 during the movement of the piston rod assembly 12 toward the bottom of the inner cavity of the pump body 11, thereby effectively preventing the washing water in the pump body 11 from flowing back into the water cup through the water inlet 13, and ensuring thorough discharge of the washing water.

Referring to fig. 1 to 5, after the dishwasher 1000 finishes washing dishes, the door 300 is opened and drives the door hinge 310 to rotate around its rotation axis, the door hinge 310 drives the first connecting rod 21 to move, the first connecting rod 21 drives the second connecting rod 22 to rotate counterclockwise around the axis of the fourth connecting hole 222, the second connecting rod 22 drives the third connecting rod 23 to swing while rotating, the other end of the third connecting rod 23 drives the slider 32 to slide along the guide slot 312, and simultaneously drives the fourth connecting rod 24 and the piston assembly 12 to move, so that the piston rod assembly 12 moves in a direction away from the pump body 11, thereby forming a negative pressure in the pump body 11, and further sucking residual water in the water cup into the pump body 11 through the water inlet pipe 40.

When the door body 300 is closed, the door body 300 drives the door hinge 310 to rotate and pushes the first connecting rod 21 to move, the first connecting rod 21 drives the second connecting rod 22 to rotate clockwise, the second connecting rod 22 pushes the third connecting rod 23 to swing, the third connecting rod 23 drives the sliding block 32 to move in the guide groove 312, the third connecting rod 23 pushes the fourth connecting rod 24 and the piston rod assembly 12 to move, so that the piston rod assembly 12 moves towards the pump body 11, and the rubber plug 122 discharges the washing water in the pump body 11 into the water discharge pipe of the dishwasher 1000 through the water discharge pipe 50 and finally discharges the washing water out of the dishwasher 1000.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A drain device for a dishwasher, comprising:

2. The drain device of claim 1, wherein the connecting rod assembly at least comprises a first connecting rod, a second connecting rod and a third connecting rod, two ends of the first connecting rod are respectively connected with the door body and one end of the second connecting rod, the other end of the second connecting rod is rotatably connected with the dishwasher, one end of the third connecting rod is connected with the second connecting rod, and the other end of the third connecting rod is connected with the piston rod assembly or connected with one end of the piston rod assembly through a fourth connecting rod.

3. The dishwasher drain of claim 2, further comprising a guide assembly, the guide assembly comprising:

the bracket is provided with a guide groove;

a slider slidably coupled to the guide groove;

4. The drain device of claim 2, wherein the second link further comprises a bent portion, and a connection point of the third link and the second link is disposed between the bent portion and the one end of the second link.

5. The drain device of claim 1, wherein the piston rod assembly comprises a push rod and a rubber plug, the rubber plug is connected with the inner cavity of the pump body in a matching manner, and the push rod is used for connecting the connecting rod assembly and the rubber plug.

6. The drain of claim 1, further comprising a water inlet pipe and a water outlet pipe, the water inlet pipe being in communication with the water inlet and the water outlet pipe being in communication with the water outlet.

7. The drain device of claim 6, wherein the inlet pipe is provided with a first check valve, the outlet pipe is provided with a second check valve, the opening direction of the first check valve is set to the inflow direction of the piston pump, and the opening direction of the second check valve is set to the opposite direction of the outflow direction of the piston pump.

8. The drain device of claim 1, wherein the water inlet is disposed above the water outlet in a height direction of the dishwasher.

9. A dishwasher, comprising:

a door body;

the dishwasher drain of any one of claims 1 to 8;

10. The dishwasher of claim 9, wherein the dishwasher drain is disposed at an inner bottom of the dishwasher.