CN117064298A

CN117064298A - Dish-washing machine

Info

Publication number: CN117064298A
Application number: CN202210507276.3A
Authority: CN
Inventors: 康智坤; 莫建刚; 李国良
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2023-11-17

Abstract

The invention discloses a dish washer, and relates to the technical field of dish washers. The dishwasher comprises a main drainage system, a washing system and a strong drainage system; the main drainage system comprises a water cup, a drainage pump and a drainage pipe, wherein the drainage pump is arranged on the water cup, the drainage pipe is communicated with the water cup, and the drainage pump is used for pumping water in the water cup into the drainage pipe; the washing system is communicated with the water cup and is used for pumping out water introduced into the water cup; the strong drainage system comprises a strong drainage water inlet pipe and a strong drainage pump, the strong drainage pump is communicated with the main drainage system and the washing system through the strong drainage water inlet pipe, and the strong drainage pump is used for pumping residual water in the main drainage system and the washing system into the strong drainage water inlet pipe. The technical scheme of the invention can solve the problem that residual water is easy to exist in the existing dish washing machine.

Description

Dish-washing machine

Technical Field

The invention relates to the technical field of dish washers, in particular to a dish washer.

Background

The drainage system of the existing dish-washing machine generally comprises a water cup, a drainage pump and a drainage pipe, the water circulation pump in the water cup is used for cleaning tableware through the circulation system, the drainage pump is installed in the water cup, the drainage pipe is communicated with the water cup, sewage after washing of the dish-washing machine is collected into the water cup every time, and the drainage pump drives the drainage impeller to rotate so as to drain the sewage from the drainage pipe communicated with the water cup.

In order to prevent the damage of the impeller and the reduction of the drainage efficiency caused by the scraping and touching of the shell of the water cup, a certain gap is reserved between the impeller of the drainage pump and the inner wall of the water cup, so that a part of water still remains in the water cup after the dish washer drains water. In the actual installation and use of the dish washer, the height of the drain pipe is always higher than that of the bottom wall of the water cup, so that part of water of the drain pipe can flow back into the water cup after the drain pump stops working; the water outlet pipe of the circulation system is higher than the water inlet pipe, so that a part of water remains in the circulation system, and when the dish washer is inclined downwards due to the influence of external force, the residual water in the dish washer flows back into the water cup. Residual water can cause moisture regain and bacteria breeding, generate peculiar smell, can also cause tableware to be polluted again, can not realize the storage of tableware, and influences user experience.

Disclosure of Invention

The invention mainly aims to provide a dish washer, which aims to solve the problem that residual water is easy to exist in the existing dish washer.

To achieve the above object, the present invention provides a dishwasher comprising:

the main drainage system comprises a water cup, a drainage pump and a drainage pipe, wherein the drainage pump is arranged on the water cup, the drainage pipe is communicated with the water cup, and the drainage pump is used for pumping water in the water cup into the drainage pipe;

a washing system in communication with the water cup and configured to pump out water introduced into the water cup; and

the strong drainage system comprises a strong drainage water inlet pipe and a strong drainage pump, the strong drainage pump is communicated with the main drainage system and the washing system through the strong drainage water inlet pipe, and the strong drainage pump is used for pumping residual water in the main drainage system and the washing system into the strong drainage water inlet pipe.

In an embodiment, the water cup comprises a main body part and a drainage part which are communicated, the drainage pump is installed in the drainage part, the drainage pipe is communicated with the drainage part, a first strong drainage port is formed in the bottom of the drainage part and/or the bottom of the main body part, and the strong drainage water inlet pipe is communicated with the drainage part and/or the main body part through the first strong drainage port.

In an embodiment, the washing system comprises a circulating pump and a spray arm, a circulating water inlet pipe is connected between the water cup and the circulating pump, a circulating water outlet pipe is connected between the circulating pump and the spray arm, a second forced-draining port is arranged at the bottom of the circulating pump and/or the bottom of the circulating water inlet pipe, and the forced-draining water inlet pipe is communicated with the circulating pump and/or the circulating water inlet pipe through the second forced-draining port.

In an embodiment, the main drainage system further comprises an anti-siphon device, a drainage channel is arranged in the anti-siphon device, the drainage channel comprises an inner drainage pipe and an outer drainage pipe, the inner drainage pipe is used for communicating the drainage channel with the water cup, the outer drainage pipe is communicated with the drainage channel, and water in the water cup sequentially passes through the inner drainage pipe, the drainage channel and the outer drainage pipe.

In an embodiment, a three-way joint is arranged between the inner drain pipe and the water cup, another joint opening outside the connection of the three-way joint and the inner drain pipe and the water cup is downward, and the three-way joint is used as a third strong drainage port, and the third strong drainage port is communicated with the water inlet port of the strong drainage pump through the strong drainage water inlet pipe.

In one embodiment, a check member is arranged between the third strong exhaust port and the water cup; or (b)

And a diverter valve with a relay is arranged between the third strong exhaust port and the water cup.

In an embodiment, the anti-siphon device is provided with a fourth strong drain communicated with the drain channel near the outer drain pipe, and a strong drain pipe is communicated between the fourth strong drain and a water outlet port of the strong drain pump.

In an embodiment, a fifth strong drainage port is arranged on the outer drainage pipe, and a strong drainage pipe is communicated between the fifth strong drainage port and a water outlet port of the strong drainage pump.

In an embodiment, the number of water inlet interfaces of the strong drainage pump is not less than 1, and the number of water outlet interfaces of the strong drainage pump is not less than 1.

In an embodiment, the strong drain pump is a vane pump, a diaphragm pump, or a vacuum pump.

According to the technical scheme, the strong drainage system comprises a strong drainage pump and a strong drainage water inlet pipe, and the strong drainage pump is respectively communicated with a main drainage system and a washing system through the strong drainage water inlet pipe, wherein the strong drainage pump is used for pumping residual water in the main drainage system and the washing system into the strong drainage water inlet pipe; after the draining of the draining pump is completed, the strong draining pump is started, and residual water in the main draining system and the washing system is drained into the strong draining pump through the strong draining water inlet pipe due to the fact that the strong draining pump is communicated with the main draining system and the washing system, and then the strong draining pump is drained out of the dish washing machine, so that bacteria breeding of the dish washing machine due to the existence of the residual water is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

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

FIG. 2 is a schematic view of the dishwasher of FIG. 1 from another perspective;

FIG. 3 is a schematic view of the construction of the water cup of FIG. 1;

FIG. 4 is a schematic diagram of the anti-siphon device of FIG. 1;

FIG. 5 is a partial cross-sectional view at A in FIG. 4;

FIG. 6 is a schematic diagram of the washing system of FIG. 1;

FIG. 7 is a schematic diagram of the strong drain pump of FIG. 1;

fig. 8 is an exploded view of the three-way joint of fig. 1.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all the directional indicators in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The drainage system of the existing dish-washing machine generally comprises a water cup, a drainage pump and a drainage pipe, the water circulation pump in the water cup is used for cleaning tableware through the circulation system, the drainage pump is installed in the water cup, the drainage pipe is communicated with the water cup, sewage after washing of the dish-washing machine is collected into the water cup every time, and the drainage pump drives the drainage impeller to rotate so as to drain the sewage from the drainage pipe communicated with the water cup. In order to prevent the damage of the impeller and the reduction of the drainage efficiency caused by the scraping and touching of the shell of the water cup, a certain gap is reserved between the impeller of the drainage pump and the inner wall of the water cup, so that a part of water still remains in the water cup after the dish washer drains water. In the actual installation and use of the dish washer, the height of the drain pipe is always higher than that of the bottom wall of the water cup, so that part of water of the drain pipe can flow back into the water cup after the drain pump stops working; the water outlet pipe of the circulation system is higher than the water inlet pipe, so that a part of water remains in the circulation system, and when the dish washer is inclined downwards due to the influence of external force, the residual water in the dish washer flows back into the water cup. Residual water can cause moisture regain and bacteria breeding, generate peculiar smell, can also cause tableware to be polluted again, can not realize the storage of tableware, and influences user experience.

In order to solve the problems, the invention provides a dish washer.

Referring to fig. 1 and 2, in the present embodiment, the dishwasher 10 includes a main drain system 100, a washing system 200, and a strong drain system 300; the main drainage system 100 comprises a water cup 110, a drainage pump 120 and a drainage pipe 130, wherein the drainage pump 120 is installed on the water cup 110, the drainage pipe 130 is communicated with the water cup 110, and the drainage pump 120 is used for pumping water in the water cup 110 into the drainage pipe 130; the washing system 200 is communicated with the water cup 110 and is used for pumping water which is introduced into the water cup 110 out; the strong drainage system 300 comprises a strong drainage water inlet pipe 310 and a strong drainage pump 330, the strong drainage pump 330 is respectively communicated with the main drainage system 100 and the washing system 200 through the strong drainage water inlet pipe 310, and the strong drainage pump 330 is used for pumping residual water in the main drainage system 100 and the washing system 200 into the strong drainage water inlet pipe 310.

In use, the dishwasher 10 effects washing of the dishes within the dishwasher 10 by circulating flow within the water cup 110 through a washing system in communication with the water cup 110; after the washing is completed, part of residual water which is not discharged into the water cup 110 is left in the washing system 200, the drainage pump 120 is started, the water in the water cup 110 is discharged through the drainage pipe 130, and part of residual water which is not discharged out of the dish washer 10 is left in the water cup 110 and/or the drainage pipe 130. By adding the strong drainage system 300, after the drainage of the drainage pump 120 is completed, the strong drainage pump 330 is started, and as the strong drainage pump 330 is communicated with the main drainage system 100 and the washing system 200 through the strong drainage water inlet pipe 310, residual water in the main drainage system 100 and the washing system 200 is discharged into the strong drainage pump 330 through the strong drainage water inlet pipe 310 and then discharged out of the dish washer 10 through the strong drainage pump 330, bacteria breeding of the dish washer 10 due to the existence of residual water is avoided.

Referring to fig. 3, specifically, the water cup 110 includes a main body 111 and a drain 112, the drain pump 120 is installed in the drain 112, and the drain 130 is in communication with the drain 112. It is known that when the dishwasher 10 is not operated, the residual water flows downward by gravity, and when the bottom of the drain 112 is lower than the bottom of the main body 111, the residual water is mainly retained in the drain 112. At this time, a first strong drainage port 140 may be provided at the bottom of the drainage portion 112, and the first strong drainage port 140 is in communication with the strong drainage water inlet pipe 310, that is, the strong drainage water inlet pipe 310 is in communication with the drainage portion 112 through the first strong drainage port 140, and the residual water collected in the drainage portion 112 may be drained through the first strong drainage port 140 under the action of the strong drainage pump 330, and the first strong drainage port 140 may be specifically provided at or near the lowest position of the drainage portion 112, that is, the residual water may be drained as much as possible. In this case, the first strong drainage port 140 may be provided at the bottom of the main body 111, and similarly, the first strong drainage port 140 may be communicated with the strong drainage water inlet pipe 310, the strong drainage water inlet pipe 310 may be communicated with the main body 111 through the first strong drainage port 140, and the residual water collected in the main body 111 may be drained through the first strong drainage port 140 under the action of the strong drainage pump 330, if the bottom of the main body 111 is lower than the bottom of the drainage portion 112.

Further, when the bottom of the drain 112 is lower than the bottom of the main body 111 and the bottom of the drain 112 is provided with the first strong drain 140, if the residual water flowing back from the drain 130 is excessive, the residual water may overflow the drain 112 and flow into the main body 111. Therefore, the first strong drain 140 may be provided at the bottom of the drain 112, and another first strong drain 140 may be provided at the bottom of the main body 111, and similarly, the another first strong drain 140 may be communicated with the strong drain pump 330 through the strong drain water inlet pipe, and the residual water overflowing into the main body 111 may be drained through the another first strong drain 140 under the action of the strong drain pump 330.

Referring to fig. 6, specifically, the washing system 200 includes a circulation pump 210 and a spray arm, a circulation water inlet pipe 220 is connected between the water cup 110 and the circulation pump 210, and a circulation water outlet pipe 230 is connected between the circulation pump 210 and the spray arm. When the bottom of the pump casing of the circulation pump 210 is lower than the bottom of the circulation water inlet pipe 220, the residual water is mainly left in the circulation pump 210, at this time, a second strong discharge port 240 may be disposed at the bottom of the pump casing of the circulation pump 210, and the second strong discharge port 240 is communicated with the strong discharge water inlet pipe 310, that is, the strong discharge water inlet pipe 310 is communicated with the circulation pump 210 through the second strong discharge port 240, the residual water collected in the circulation pump 210 may be discharged through the second strong discharge port 240 under the action of the strong discharge pump 330, and the second strong discharge port 240 may be specifically disposed at the lowest position or near the lowest position of the pump casing of the circulation pump 210, that is, the residual water may be discharged as much as possible. And if the bottom of the circulation water inlet pipe 220 is lower than the bottom of the pump casing of the circulation pump 210, the residual water may flow back into the circulation water inlet pipe 220, and at this time, the second strong exhaust port 240 may be disposed at the bottom of the circulation water inlet pipe 220, and similarly, the second strong exhaust port 240 is communicated with the strong exhaust water inlet pipe 310, the strong exhaust water inlet pipe 310 is communicated with the circulation water inlet pipe 220 through the second strong exhaust port 240, and the residual water collected in the circulation water inlet pipe 220 may be exhausted through the second strong exhaust port 240 under the action of the strong exhaust pump 330.

Further, when the bottom of the pump casing of the circulation pump 210 is lower than the bottom of the circulation water inlet pipe 220, and the bottom of the pump casing of the circulation pump 210 is provided with the second strong drain 240, if the residual water in the circulation pump 210 is excessive, the residual water overflows the circulation pump 210 and flows into the circulation water inlet pipe 220. Therefore, while the second strong exhaust port 240 is provided at the bottom of the pump casing of the circulation pump 210, another second strong exhaust port 240 may be provided at the bottom of the circulation water inlet pipe 220, and similarly, the another second strong exhaust port 240 is communicated with the strong drainage pump 330 through the strong exhaust port water inlet pipe, and the residual water overflowing into the circulation water inlet pipe 220 may be drained through the another second strong exhaust port 240 under the action of the strong drainage pump 330.

The washing system 200 may further include a heating device that may heat water flowing through the washing system 200 to achieve a better cleaning of the dishes within the dishwasher 10. Specifically, the heating device may be a heating module disposed in the circulation pump 210, so that the circulation pump 210 can perform the function of heating the water while circulating the water.

Referring to fig. 4 and 5, after the washing of the dishwasher 10 is completed, the drain pump 120 discharges the sewage washed in the water cup 110 through the drain pipe 130, and the drain pipe 130 directly discharges the sewage, which may generate a backflow, so that the water flow is siphoned to suck the sewage back into the water cup 110 again. In view of this, in an embodiment, the main drainage system 100 further includes an anti-siphon device 150, a drainage channel 151 is provided in the anti-siphon device 150, the drainage pipe 130 includes an inner drainage pipe 131 and an outer drainage pipe 132, the inner drainage pipe 131 is used for communicating with the drainage channel 151 and the water cup 110, the outer drainage pipe 132 is communicated with the drainage channel 151, and water in the water cup 110 sequentially passes through the inner drainage pipe 131, the drainage channel 151 and the outer drainage pipe 132. That is, the water in the water cup 110 is firstly discharged into the drain passage through the inner drain pipe 131 under the action of the drain pump 120, and then is discharged to the outside of the dishwasher 10 through the outer drain pipe 132 communicated with the drain passage 151, and the outer drain pipe 132 reduces the height of the sewage outlet, thereby avoiding the siphon phenomenon existing when the drain pipe 130 directly discharges sewage.

As can be seen from the above, after the sewage is discharged from the dishwasher 10, a part of residual water is stored in the drain pipe 130 and is returned to the water cup 110 again. In consideration of the fact that the amount of residual water in the inner drain pipe 131 is reduced after a certain period of backflow, a part of residual water is attached to the inner wall of the inner drain pipe 131, and cannot completely flow back into the water cup 110. Therefore, preferably, a third strong drainage port 162 is provided at the bottom of the inner drain pipe 131, and the third strong drainage port 162 is communicated with the strong drainage water inlet pipe 310, that is, the strong drainage water inlet pipe 310 is communicated with the inner drain pipe 131 through the third strong drainage port 162, and the residual water collected in the inner drain pipe 131 can be drained through the third strong drainage port 162 under the action of the strong drainage pump 330.

Referring to fig. 1 and 8, in particular, in an embodiment, a three-way joint 160 is disposed between the inner drain pipe 131 and the water cup 110, another joint opening outside the connection between the three-way joint 160 and the inner drain pipe 131 and the water cup 110 is downward, and the third strong drainage port 162 is used as a third strong drainage port 162, and the third strong drainage port 162 is communicated with the water inlet 331 of the strong drainage pump 330 through the strong drainage water inlet pipe 310.

Referring to fig. 8, further, in order to prevent the sewage from flowing back into the water cup 110 when the inner drain pipe 131 performs the sewage draining operation, a check member 161 is disposed between the third forced draining port 162 and the water cup 110, and the check member 161 is configured to limit the water path flowing in the inner drain pipe 131, so as to prevent the water in the inner drain pipe 131 from flowing back into the water cup 110. Specifically, the check member 161 includes a check plate 161a and a mounting tube 161b, the mounting tube 161b is coaxially mounted in the three-way joint 160 and is located between the third forced-air outlet 162 and the water cup 110, the check plate 161a is rotatably mounted at one end of the mounting tube 161b near the third forced-air outlet 162, and is blocked by the end of the mounting tube 161b, and the check plate 161a can only rotate in a direction away from the mounting tube 161 b. That is, when the water flows from the cup 110 to the anti-siphon device 150, the check plate 161a is turned open by the impact of the water flow, the installation pipe 161b is in a circulation state, and when the water flows from the anti-siphon device 150 to the cup 110, the check plate 161a abuts against the end of the installation pipe 161b by the impact of the water flow, and the installation pipe 161b is in a blocking state, thereby restricting the water flow to the cup 110. When the residual water is limited to the inner drain pipe 131, it is discharged through the third strong drain port 162 by the strong drain pump 330.

Unlike the previous embodiment, a diverter valve with a relay, or other similar function, may be provided between the third forced outlet 162 and the cup 110, in addition to the check member 161 being provided to restrict the flow of water in the inner drain pipe 131.

The strong drainage pump 330 has a water inlet 331 and a water outlet 332, wherein the strong drainage water inlet pipe 310 is communicated with the water inlet 331 of the strong drainage pump 330 and the first strong drainage port 140, the second strong drainage port 240 and the third strong drainage port 162, and correspondingly, the water outlet 332 is communicated with a strong drainage water outlet pipe, and the strong drainage pump 330 discharges residual water in the main drainage system 100 and the washing system 200 through the strong drainage water inlet pipe 310 and then the strong drainage water outlet pipe 320 discharges the residual water out of the dish washer 10.

Referring to fig. 1 and 5, in an embodiment, the anti-siphon device 150 is provided with a fourth strong drain 152 near the outer drain pipe 132 and communicated with the drain channel 151, and a strong drain pipe 320 is communicated between the fourth strong drain 152 and the water outlet 332 of the strong drain pump 330. That is, the residual water collected by the strong drainage pump 330 is not directly drained by the strong drainage pipe 320, but is firstly drained into the drainage channel 151 through the strong drainage pipe 320, and then drained to the outside of the dishwasher 10 through the outer drainage pipe 132. The siphon phenomenon of the strong drainage pipe 320 can be avoided by using the outer drainage pipe 132 to drain the residual water out of the dish washer 10, and the setting of the external water outlet of the dish washer 10 can be reduced, so that the unified setting of external drainage is facilitated.

Unlike the above embodiment, in one embodiment, the outer drain pipe 132 is provided with a fifth strong drain, and a strong drain pipe 320 is connected between the fifth strong drain and the water outlet 332 of the strong drain pump 330. That is, the residual water collected by the strong drain pump 330 is not directly drained by the strong drain pipe 320, but is firstly drained into the outer drain pipe 132 through the strong drain pipe 320, and then drained out of the dishwasher 10 through the outer drain pipe 132. Similarly, the siphon phenomenon of the strong drainage pipe 320 can be avoided, and the setting of the external water outlet of the dishwasher 10 can be reduced, so that the unified setting of external drainage is facilitated.

Referring to fig. 7, as can be seen from the above description, the main drain system 100 and the washing system 200 are provided with the strong drain ports, which means that the number of the strong drain water inlet pipes 310 is multiple, and at this time, the number of the water inlet ports 331 of the strong drain pump 330 may be 1, and the strong drain water inlet pipes 310 are communicated with the same water inlet ports 331 of the strong drain pump 330; the number of the water inlet ports 331 of the strong drainage pump 330 may be plural, and the number of the water inlet ports 331 of the strong drainage pump 330 corresponds to the number of the strong drainage water inlet pipes 310, and each strong drainage water inlet pipe 310 is communicated with a different water inlet port 331 of the strong drainage pump 330. Similarly, the number of the water outlet ports 332 of the strong drainage pump 330 may be 1, or may be plural, and different strong drainage pipes 320 may be connected to each other.

After the main drain system 100 and the washing system 200 are communicated with the strong drain system 300, the order in which the strong drain system 300 drains the residual water in the main drain system 100 and the washing system 200 is not limited, and the residual water in the main drain system 100 may be drained first, the residual water in the washing system 200 may be drained first, and the residual water in the main drain system 100 and the residual water in the washing system 200 may be drained simultaneously.

Specific types of strong drain pump 330 include, but are not limited to, impeller pumps, diaphragm pumps, and other similarly functioning drain pumps such as vacuum pumps.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.

Claims

1. The utility model provides a dish washer, includes main drainage system, main drainage system includes drinking cup, drain pump and drain pipe, the drain pump install in the drinking cup, the drain pipe with the drinking cup intercommunication, the drain pump be used for with the interior water pumping of drinking cup is in the drain pipe, its characterized in that, dish washer still includes:

2. The dishwasher of claim 1, wherein the water cup comprises a body part and a drain part which are communicated, the drain pump is installed in the drain part, the drain pipe is communicated with the drain part, a first strong drain port is arranged at the bottom of the drain part and/or the bottom of the body part, and the strong drain water inlet pipe is communicated with the drain part and/or the body part through the first strong drain port.

3. The dishwasher of claim 1, wherein the washing system comprises a circulation pump and a spray arm, a circulation water inlet pipe is connected between the water cup and the circulation pump, a circulation water outlet pipe is connected between the circulation pump and the spray arm, a second strong exhaust port is arranged at the bottom of a pump shell of the circulation pump and/or at the bottom of the circulation water inlet pipe, and the strong exhaust water inlet pipe is communicated with the circulation pump and/or the circulation water inlet pipe through the second strong exhaust port.

4. A dishwasher according to any one of claims 1 to 3, wherein the main drain system further comprises an anti-siphon device, wherein a drain passage is provided in the anti-siphon device, the drain pipe comprises an inner drain pipe for communicating with the drain passage and a water cup, and an outer drain pipe communicating with the drain passage, and water in the water cup passes through the inner drain pipe, the drain passage and the outer drain pipe in sequence.

5. The dishwasher of claim 4, wherein a three-way joint is provided between the inner drain pipe and the water cup, the three-way joint being provided with a further joint opening facing downwards beyond the connection of the inner drain pipe and the water cup, and being a third forced drain communicating with the water inlet of the forced drain pump through the forced drain water inlet pipe.

6. The dishwasher of claim 5 wherein a check is provided between the third forced drain and the water cup; or (b)

7. The dishwasher of claim 4, wherein the anti-siphon device is provided with a fourth strong drain communicating with the drain passage near the outer drain pipe, and a strong drain pipe is communicated between the fourth strong drain and a water outlet of the strong drain pump.

8. The dishwasher of claim 4 wherein a fifth forced drain is provided on the outer drain, and a forced drain is connected between the fifth forced drain and the outlet of the forced drain pump.

9. The dishwasher of claim 1, wherein the number of water inlet ports of the strong drain pump is not less than 1, and the number of water outlet ports of the strong drain pump is not less than 1.

10. The dishwasher of claim 1, wherein the strong drain pump is a vane pump, a diaphragm pump or a vacuum pump.