CN217390657U - Internal circulation drying system for dish washing machine - Google Patents

Abstract

The utility model discloses an inner loop drying system for dish washer, include: the side wall of the inner container is provided with an air outlet; the water cup is provided with a water collecting cavity and a water chamber, the water collecting cavity is communicated with the inner container, the water chamber is provided with an air inlet and an air vent which are respectively communicated with the water chamber, and the air vent is communicated with the inner container and/or the water collecting cavity; the air duct assembly comprises a condensation air duct and a gas conveying device, the two opposite ends of the condensation air duct are respectively communicated with the air outlet and the air inlet, and the gas conveying device is arranged on the condensation air duct or between the condensation air duct and the air inlet. The utility model discloses a make damp and hot gas inner loop to it is ventilative to add the water chamber in circulation drying system, makes damp and hot gas's aqueous vapor condensation, realizes drying function, has solved simultaneously and has discharged the outer comdenstion water scheduling problem that appears of inner bag.

Description

Internal circulation drying system for dish washing machine

Technical Field

The utility model relates to a dish washer technical field especially relates to an inner loop drying system for dish washer.

Background

In order to improve the drying effect of the dishware after the washing of the dishware washing machine, some dishwashers are provided with a ventilation system at present, and in the drying stage, the ventilation system can suck the outside air into the inner container while exhausting the damp and hot air in the inner container out of the machine, so that the drying effect of the dishware can be effectively promoted. However, such a drying system has the following problems:

1. the discharged steam-rich damp-heat gas is easy to condense into water drops at the air outlet, and a large amount of water drops drop from the air outlet, so that the use experience of a user is influenced, and the misunderstanding of water leakage of the user can be possibly caused;

2. the temperature of the external air pumped into the liner is relatively low, and the external air can be mixed with the humid and hot air near the air inlet, so that part of steam can be condensed on the side wall of the liner, the bowl basket and the tableware, and the drying efficiency is influenced;

3. in order to improve the temperature of the inlet air, a heater is additionally arranged in the air inlet duct, but higher energy consumption can be generated when the air is heated, and the energy conservation is not facilitated;

4. the air inlet is communicated with the outside atmosphere, and some bacteria or viruses floating in the air are possibly brought in during air inlet to a certain extent, so that secondary pollution to the tableware can be caused.

Disclosure of Invention

The utility model discloses aim at solving one of the problems that exist among the current correlation technique at least to a certain extent, for this reason, the utility model provides an inner loop drying system for dish washer through making damp and hot gas inner loop to it is ventilative to add the water chamber in circulation drying system, makes damp and hot gas's aqueous vapor condensation, realizes drying function, has solved simultaneously and has exhausted the interior outer comdenstion water scheduling problem that appears of container.

According to the internal circulation drying system for the dish washing machine, the technical scheme is that:

an internal circulation drying system for a dishwasher, comprising: the side wall of the inner container is provided with an air outlet; the water cup is provided with a water collecting cavity and a water chamber, the water collecting cavity is communicated with the inner container, the water chamber is provided with an air inlet and an air vent which are respectively communicated with the water chamber, and the air vent is communicated with the inner container and/or the water collecting cavity; the air channel assembly comprises a condensation air channel and a gas conveying device, the two opposite ends of the condensation air channel are respectively communicated with the air outlet and the air inlet, and the gas conveying device is arranged on the condensation air channel or between the condensation air channel and the air inlet; a controller electrically connected to the gas delivery device.

In some embodiments, a water seal is formed in the water chamber, the air inlet is located below the water seal of the water chamber, and at least a portion of the air vent is located above the water seal of the water chamber.

In some embodiments, the air inlet hole is formed at a lower end of the bottom or side wall of the water chamber, and at least a portion of the air hole is formed at the top of the water chamber.

In some embodiments, the water cup is provided with a water inlet which is communicated with the water chamber.

In some embodiments, a water vapor isolation structure is arranged in the water chamber, and the water vapor isolation structure is positioned above or below the air vent.

In some embodiments, the water drainage device comprises a drainage channel and a water drainage valve electrically connected with the controller, wherein the drainage channel is positioned at the lower end of the bottom or the side wall of the water chamber, one end of the drainage channel is communicated with the water chamber, and the other end of the drainage channel is communicated with the water collection cavity or the sewer; the water drain valve is arranged on the water drain channel and used for opening or closing the water drain channel.

In some embodiments, the water chamber is communicated with the water collecting cavity through the water drainage channel; the water cup is also provided with a main water drainage port, and the water collecting cavity is selectively communicated with a sewer through the main water drainage port; the water drain valve is used for opening the water drain channel after the heating washing of the dishwasher is finished and also used for closing the water drain channel before the water is drained from the water collecting cavity.

In some embodiments, the water chamber communicates with a sewer through the drainage channel; the water cup is further provided with a main water drainage port and a water pipeline, the main water drainage port is communicated with the water collection cavity, the water chamber is selectively communicated with the water collection cavity through the water pipeline, the water pipeline is used for conducting a passage between the water chamber and the water collection cavity after the heating and washing of the dish washing machine are finished, and the water pipeline is also used for disconnecting the passage between the water chamber and the water collection cavity before the water collection cavity drains water.

In some embodiments, the controller further comprises a drain pump electrically connected to the controller, the main drain opening is disposed at a bottom of the water collection chamber, and the drain pump is disposed on the main drain opening.

In some embodiments, the water heater further comprises a temperature measuring device electrically connected to the controller, and the temperature measuring device is disposed on the water chamber and used for detecting the temperature of water in the water chamber.

Compared with the prior art, the utility model discloses an at least including following beneficial effect:

1. the utility model discloses an internal circulation drying system, through add the hydroecium on the drinking cup, the hydroecium has inlet port and the bleeder vent of communicating its respectively, the inlet port passes through the air outlet of condensation wind channel and gas conveyor intercommunication inner bag, the bleeder vent communicates inner bag and/or water collecting cavity, in order to form internal circulation system, make damp heat gas internal circulation, through ventilative with the help of the hydroecium, make the aqueous vapor of damp heat gas fully condense at the hydroecium, thereby can realize drying function, firstly avoid appearing the problem of comdenstion water because of exhausting to the inner bag outside, secondly avoid the outside air of suction in the inner bag to mix with partial damp heat gas, condense on inner bag lateral wall, bowl basket and tableware, guarantee the clean health of inner bag inside and tableware simultaneously, prevent that the tableware from receiving secondary pollution;

2. the water chamber is integrated on the water cup, so that the structure of the whole drying system is more compact, and meanwhile, the full utilization rate of the water cup is improved.

Drawings

FIG. 1 is a schematic structural diagram of a dishwasher in embodiment 1 of the present invention;

FIG. 2 is a schematic view of an internal circulation system of wet hot gas in a dishwasher according to embodiment 1 of the present invention;

FIG. 3 is a schematic view of a water flow system in a dishwasher according to embodiment 1 of the present invention;

FIG. 4 is a schematic structural view of a water cup, a drain valve and a drain valve in embodiment 1 of the present invention;

FIG. 5 is a sectional view of a cup according to embodiment 1 of the present invention;

fig. 6 is a schematic view of an internal circulation system of wet hot gas in a dishwasher according to embodiment 2 of the present invention.

Reference numerals: the inner container 1 and the air outlet 11;

the water cup 2, the water collecting cavity 21, the main water drainage port 211, the water chamber 22, the air inlet hole 221, the air vent 222 and the water inlet 23;

a condensation air duct 31, a gas conveying device 32, an air pipe 33 and a hanging high point 331;

a drain passage 41, a drain valve 42; a drain pump 5;

a spray arm 6; a circulation pump 7; a water-gas separation structure 8, a water-gas separation net 81; and a temperature measuring device 9.

Detailed Description

The present invention is illustrated by the following examples, but the present invention is not limited to these examples. To the embodiment of the present invention, modify or replace some technical features, without departing from the spirit of the present invention, it should be covered in the technical solution scope of the present invention.

Example 1

Referring to fig. 1, the present embodiment provides an internal circulation drying system for a dishwasher, including a tub 1, a cup 2, an air duct assembly (not shown) and a controller (not shown). An air outlet 11 for damp and hot air to pass through is arranged on the side wall of the inner container 1. The water cup 2 is arranged at the bottom of the inner container 1 and is provided with a water collecting cavity 21 and a water chamber 22, and the water collecting cavity 21 is communicated with the inner container 1. The water chamber 22 has an air inlet 221 and an air vent 222 respectively communicated with the water chamber 22, the air vent 222 is used for air and/or water to pass through, and the air vent 222 is communicated with the liner 1 and/or the water collecting cavity 21, that is, the air vent 222 of the water chamber 22 can be directly communicated with the liner 1 only, or the air vent 222 of the water chamber 22 is communicated with the liner 1 through the water collecting cavity 11, or the air vent 222 of the water chamber 22 is respectively communicated with the liner 1 and the water collecting cavity 11.

The air duct assembly includes a condensation air duct 31 and a gas conveying device 32, and two opposite ends of the condensation air duct 31 are respectively communicated with the air outlet and the air inlet 221. The gas delivery device 32 is disposed on the condensation air duct 31 or between the condensation air duct 31 and the air inlet 221, and is configured to suck the humid and hot gas inside the liner 1 into the condensation air duct 31 through the air outlet 11, so that the humid and hot gas performs internal circulation along the liner 1 → the air outlet 11 → the condensation air duct 31 → the air inlet 221 → the water chamber 22 → the air hole 222 → the liner 1, and the humid and hot gas realizes a drying function in an internal circulation process. The controller is electrically connected to the gas delivery device 32 for controlling the activation or deactivation of the gas delivery device 32.

It can be seen that, the internal circulation drying system of this embodiment, through adding the hydroecium 22 on the drinking cup 2, the hydroecium 22 has inlet port 221 and bleeder vent 222 that communicate it respectively, inlet port 221 communicates the air outlet 11 of the inner bag 1 through condensation wind channel 31 and gas conveyor 32, bleeder vent 222 communicates inner bag 1 and/or water collecting cavity 21, in order to form the internal circulation system, make damp and hot gas internal circulation, through breathing in with the help of hydroecium 22, make the aqueous vapor of damp and hot gas fully condense at the hydroecium 22, thus can realize drying function, firstly avoid appearing the problem of comdenstion water because of exhausting to the outer of inner bag 1, secondly avoid the outside air and partial damp and hot gas mixture of suction inner bag 1, condense on inner bag lateral wall, bowl basket and tableware, guarantee the inside of inner bag 1 and the sanitation of tableware simultaneously, prevent the tableware from receiving secondary pollution. In addition, the water chamber 22 is integrated on the water cup 2, so that the structure of the whole drying system is more compact, and meanwhile, the full utilization rate of the water cup 2 is improved.

In this embodiment, a water seal is formed in the water chamber 22, the air inlet 221 is located below the water seal of the water chamber 22, and at least a portion of the air vents 222 is located above the water seal of the water chamber 22. From this, when dish washer inside has damp and hot gas, start gas delivery mechanism 32, damp and hot gas in the inner bag 1 flows along inner loop drying system, when the water seal in the flowing water room 22, the water that is relatively colder in the hydroecium 22 makes the abundant condensation of steam that contains in the damp and hot gas to improve condensation efficiency, and then realize improving the drying efficiency in the inner bag 1.

Referring to fig. 2 and 4, in the present embodiment, the air intake hole 221 is provided at the lower end of the sidewall of the water chamber 22. In other embodiments, the air inlet hole 221 may be disposed at the bottom of the water chamber 22.

Referring to fig. 2 and 4-5, in the present embodiment, a plurality of ventilation holes 222 are formed at the upper corner of the water chamber 22 near the water collecting cavity 21, and the ventilation holes 222 are spaced along the upper edge of the water collecting cavity 21, and each ventilation hole 222 sequentially penetrates through the top of the water chamber 22 and the upper end of the sidewall between the water chamber 22 and the water collecting cavity 21, so that each ventilation hole 222 is respectively communicated with the liner 1 and the water collecting cavity 11. Therefore, the air holes 222 are respectively communicated with the inner container 1 and the water collecting cavity 11, so that when the water chamber 22 is ventilated, air can flow upwards into the inner container 1 through the air holes 222, and at the moment, the air holes 222 have a ventilation function; when water enters the water chamber 22, water in the water chamber 22 can flow into the water collecting cavity 21 through the air holes 222, and at the moment, the air holes 222 have a water passing function, so that water can enter the water collecting cavity 21 without adding a water filling port directly communicated with the water collecting cavity 21 on the water cup 2.

In other embodiments, all the air holes 222 may be divided into two parts, one of which is disposed at the upper end of the sidewall of the water chamber 22 and is dedicated for water flowing, so that water can be injected into the water collecting cavity 22 through the water chamber 22; the other part is arranged at the top of the water chamber 22 and is specially used for ventilation, so that the gas condensed by the water seal of the water chamber 22 can flow into the inner container 1.

Referring to fig. 3 and 5, in this embodiment, the water cup 2 is further provided with a water inlet 23, and the water inlet 23 is directly communicated with the water chamber 22, so that regular water change of the water chamber 22 can be realized through the water inlet 23, and a certain temperature difference is maintained between water in the water chamber 22 and the internally circulating humid and hot gas, thereby improving the condensation efficiency, i.e., the drying efficiency in the inner container 1.

In this embodiment, the water collecting cavity 21 is communicated with the water chamber 22 through the air hole 222, so as to ensure that the water chamber 22 is located between the water inlet 23 and the water collecting cavity 2, that is, the water chamber 2 is located on the water inlet path, before water enters the water collecting cavity 21 and the inner container 1, the water chamber 22 is filled with water, and before the dishwasher is heated and washed, the water chamber 22 forms a water seal.

In other embodiments, the water inlet 23 may be designed to communicate with the water chamber 22 and the water collection chamber 21, respectively, so that the inflow of the water chamber 22 and the inflow of the water collection chamber 21 are independent of each other. Alternatively, the water inlet 23 is designed to communicate with the water chamber 22 through the water collection chamber 21.

Referring to fig. 1-2, in the present embodiment, in order to discharge the condensed water in the condensed air duct 31, a condensed water discharge outlet is provided at the bottom of the condensed air duct 31, and the condensed water discharge outlet may be directly communicated with the water collecting cavity 21 or a sewer through a drain pipe. The air delivery device 32 is preferably an air pump or a blower, and in this embodiment, the air delivery device 32 is an air pump, and the air pump is disposed between the condensation air duct 31 and the air inlet 221.

The air duct assembly further comprises an air duct 33, one end of the air duct 33 is communicated with the air inlet 221 of the water chamber 22, and the other end is communicated with the condensation air duct 31 through an air pump. The air tube 33 is provided with a hanging point 331, and the hanging point 331 is located outside the outer sidewall of the liner 1 and is disposed near the condensation air duct 31, so that the condensed water generated in the condensation air duct 31 can be prevented from flowing into the water chamber 22 along the air tube 33 by the hanging point 331.

Referring to fig. 2 to 4, further, a drain channel 41 and a drain valve 42 electrically connected to the controller are included, the drain channel 41 is located at the bottom or lower end of the side wall of the water chamber 22, and one end of the drain channel 41 is communicated with the water chamber 22 and the other end is communicated with the water collecting chamber 21 or the sewer. A drain valve 42 is provided on the drain passage 41 for opening or closing the drain passage 41.

In the present embodiment, the drainage channel 41 is communicated in the following two ways:

first, the water chamber 22 communicates with the water collection chamber 21 through the drainage channel 41, so that the water chamber 22 can perform water channeling heat exchange with the water collection chamber 21, and the water in the water chamber 22 can be drained through the water collection chamber 21. The water cup 2 is further provided with a main water drainage port 211, and the water collection cavity 21 is selectively communicated with a sewer through the main water drainage port 211.

The water discharge valve 42 is used to open the water discharge passage 41 after the heated washing of the dishwasher is finished, and also to close the water discharge passage 41 before the water collection chamber 21 is discharged. Therefore, when the dishwasher heats and washes, the water in the water collecting cavity 21 is heated water, the water temperature of the water is higher than that of the water in the water chamber 22, after the dishwasher is heated and washed, the water discharging valve 42 is controlled to open the water discharging channel 41, at the moment, the water in the water collecting cavity 21 and the water in the water chamber 22 perform crossflow heat exchange, so that the temperatures of the water collecting cavity 21 and the water chamber 22 are consistent, and the water in the water chamber 13 is heated into hot water. The discharge valve 42 is closed before the hot water in the water collecting chamber 21 is discharged through the main water discharge port 211, and the hot water in the water chamber 13 is sealed. When the water collection cavity 21 is filled with water again, the hot water sealed in the water chamber 13 is fully mixed with the water filled again, so that part of heat in the previous heating stage is transferred to the next water filling, the temperature of the water filled again in the water collection cavity 21 is raised, the energy consumption in the next heating stage can be reduced, and the energy-saving effect is achieved on the whole; secondly, because the water in the original water chamber 22 is not discharged, the new water inflow cannot be increased, and the waste of water resources is reduced.

In the working stage of the internal circulation drying system, the water drain valve 42 can also open the water drainage channel 41 when the water temperature of the water chamber 22 is higher, so that the water in the water chamber 22 is drained through the water drainage channel 41, the water collection cavity 21 and the main water drainage port; after the water in the water chamber 22 is drained, the drain valve 42 closes the drain channel 41, and at this time, the water chamber 22 is refilled through the water inlet 23, so as to ensure that the temperature of the water in the water chamber 22 is low, and further ensure that the water chamber 22 has a sufficient condensation effect on the water vapor contained in the humid and hot gas.

Secondly, the water chamber 22 is communicated with a sewer through the drainage channel 41, so that when the water chamber 22 needs to change water, the water in the water chamber 22 can be directly drained without passing through the water collecting cavity 21 and only by opening the drainage channel 41 through the water drain valve 42. The water cup 2 is further provided with a main water outlet 211 and a water pipeline (not shown in the figure), wherein the main water outlet 211 is communicated with the water collecting cavity 21, the water chamber 22 is selectively communicated with the water collecting cavity 21 through the water pipeline, the water pipeline is used for conducting the passage between the water chamber 22 and the water collecting cavity 21 after the heating and washing of the dishwasher are finished, and is also used for disconnecting the passage between the water chamber 22 and the water collecting cavity 21 before the water is discharged from the water collecting cavity 21.

Alternatively, the concrete structure of the water passage line may be the same as the drainage structure composed of the drainage passage 41 and the water discharge valve 42. Therefore, the water chamber 22 and the water collecting cavity 21 can exchange heat by water channeling, and the water chamber 22 is emptied without passing through the water collecting cavity 21.

Referring to fig. 2, further, a drain pump 5 electrically connected to the controller is further included, a main drain port 211 is provided at the bottom of the water collecting chamber 21, and the drain pump 5 is provided on the main drain port 211. Therefore, the drainage condition of the water collecting cavity 21 can be controlled by the drainage pump 5.

In the draining stage of the dishwasher, the water in the inner container 1 is drained from the bottom of the water collecting cavity 21 through the main draining port 211 connected to the draining pump 5. In the process, the water level of the inner container 1 gradually drops, and when the water level drops below the air holes 222 of the water chamber 22, the water level of the water collecting cavity 21 continues to drop, and the water in the water chamber 22 cannot be drained away. Therefore, when the water collecting cavity 21 is filled with water next time, the water chamber 22 is filled with water, newly-entered water directly enters the water collecting cavity 21 and the inner container 1 through the water chamber 22, and the water inflow is basically the same as the water inflow without the water chamber 22, so that the next water inflow is basically not influenced.

Referring to fig. 3, in the present embodiment, a heating device (not shown) electrically connected to the controller is further included, and the heating device is disposed at the bottom of the water collecting chamber 21, or between the water collecting chamber 21 and the spraying arm 6 of the dishwasher, for heating the washing water during the process of washing the dishes, so as to enhance the washing effect of the dishes. In addition, a circulating pump 7 is arranged between the water collecting cavity 21 and the spray arm 6 of the dishwasher, and the circulating pump 7 is electrically connected with a controller and is used for pumping the water in the water collecting cavity 21 to the spray arm 6.

Referring to fig. 3, further, a temperature measuring device 9 electrically connected to the controller is further included, and the temperature measuring device 9 is a temperature sensor or a temperature probe, and is disposed on the water chamber 22 and used for detecting the temperature of the water inside the water chamber 22. In the operation stage of the internal circulation drying system, after a period of operation, the water in the water chamber 22 will gradually increase in temperature. If the detected water temperature is higher than the temperature threshold value, water can be changed periodically, namely, the water chamber 13 is emptied first, and then water is filled again, so that a certain temperature difference is ensured between the water in the water chamber 22 and the internal circulation humid and hot gas, and the condensation efficiency of the internal circulation humid and hot gas when the internal circulation humid and hot gas passes through the water seal of the water chamber 22 is improved.

Example 2

Referring to fig. 6, the present embodiment is different from embodiment 1 in that a water vapor separation structure 8 is provided in the water chamber 22, and the water vapor separation structure 8 is located above or below the vent holes 222. Therefore, the water content of the gas flowing from the air holes 222 to the inner container 1 can be reduced through the water vapor isolation structure 8, and the drying effect is further improved.

Specifically, the water vapor isolating structure includes a water vapor isolating net 81, and the water vapor isolating net 81 may be disposed in the water chamber 22 and located between the air inlet 221 and the air vent 222, or attached to the bottom of the air vent 222, or disposed between the air vent 222 and the liner 1.

When the water vapor separation net 81 is disposed in the water chamber 22, the water vapor separation net 81 is disposed in the water chamber 22 and divides the water chamber 22 into an upper portion and a lower portion, the air inlet hole 221 communicates with the lower portion of the water chamber 22, and the air vent 222 communicates with the upper portion of the water chamber 22. Correspondingly, the water inlet 23 is not communicated with the water chamber 22 any more, but is directly communicated with the water collecting cavity 21, at the moment, no water seal is formed in the water chamber 22, and the drying function is realized only through the cooperation of the water vapor isolating net 81 and the air vents 222.

When the water vapor separation net 81 is attached to the bottom of the air vent 222, the water inlet 23 is not communicated with the water chamber 22, but is directly communicated with the water collecting cavity 21.

When the water vapor separation net 81 is arranged between the air holes 222 and the inner container 1, a water vapor separation cavity above the air holes 222 can be additionally arranged on the water cup 1, the air holes 222 are communicated with the inner container 1 through the water vapor separation cavity, the water vapor separation net 81 is arranged in the water vapor separation cavity, and at the moment, the water inlet 23 is still communicated with the water collection cavity 21 through the water chamber 22. Therefore, the water seal of the water chamber 22 and the water-vapor separation net 81 in the water-vapor separation cavity enable the condensation efficiency to be better and the drying efficiency to be higher.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which all fall within the scope of the invention.

Claims (10)

1. An internal circulation drying system for a dishwasher, comprising:

the air conditioner comprises a liner (1), wherein an air outlet (11) is formed in the side wall of the liner (1);

the water cup (2) is provided with a water collecting cavity (21) and a water chamber (22), the water collecting cavity (21) is communicated with the inner container (1), the water chamber (22) is provided with an air inlet (221) and an air vent (222) which are respectively communicated with the water chamber, and the air vent (222) is communicated with the inner container (1) and/or the water collecting cavity (21);

the air channel assembly comprises a condensation air channel (31) and a gas conveying device (32), two opposite ends of the condensation air channel (31) are respectively communicated with the air outlet and the air inlet (221), and the gas conveying device (32) is arranged on the condensation air channel (31) or between the condensation air channel (31) and the air inlet (221);

a controller electrically connected to the gas delivery device (32).

2. The internal circulation drying system for a dishwasher according to claim 1, wherein a water seal is formed in the water chamber (22), the air inlet hole (221) is positioned below the water seal of the water chamber (22), and at least a portion of the air vent (222) is positioned above the water seal of the water chamber (22).

3. An internal circulation drying system for a dishwasher, according to claim 2, wherein the air inlet hole (221) is provided at a lower end of the bottom or side wall of the water chamber (22), and at least a portion of the airing hole (222) is located at the top of the water chamber (22).

4. An internal circulation drying system for a dishwasher according to any one of claims 1-3, characterized in that the water cup (2) is provided with a water inlet (23), said water inlet (23) communicating with the water chamber (22).

5. The internal circulation drying system for a dishwasher according to claim 1, wherein a moisture insulating structure is provided in the water chamber (22), the moisture insulating structure being located above or below the airing hole (222).

6. The internal circulation drying system for the dishwasher according to claim 1, comprising a drain channel (41) and a drain valve (42) electrically connected with the controller, wherein the drain channel (41) is located at the lower end of the bottom or side wall of the water chamber (22), and one end of the drain channel (41) is communicated with the water chamber (22) and the other end is communicated with the water collecting cavity (21) or a sewer; the water drain valve (42) is arranged on the water drain channel (41) and is used for opening or closing the water drain channel (41).

7. An internal circulation drying system for a dishwasher according to claim 6, wherein the water chamber (22) communicates with the water collection chamber (21) through the drain channel (41);

the water cup (2) is also provided with a main water drainage port (211), and the water collecting cavity (21) is selectively communicated with a sewer through the main water drainage port (211);

the water drain valve (42) is used for opening the water drain channel (41) after the heating washing of the dishwasher is finished and is also used for closing the water drain channel (41) before the water collection cavity (21) drains water.

8. An internal circulation drying system for a dishwasher according to claim 6, wherein the water chamber (22) is connected to a sewer through the drainage channel (41);

the water cup (2) is further provided with a main water drainage port (211) and a water pipeline, the main water drainage port (211) is communicated with the water collection cavity (21), the water chamber (22) is selectively communicated with the water collection cavity (21) through the water pipeline, the water pipeline is used for conducting a passage between the water chamber (22) and the water collection cavity (21) after the heating and washing of the dish washing machine are finished, and the water pipeline is further used for disconnecting the passage between the water chamber (22) and the water collection cavity (21) before the water collection cavity (21) drains water.

9. An internal circulation drying system for a dishwasher, according to claim 7 or 8, further comprising a drain pump (5) electrically connected to the controller, the main drain opening (211) being provided at the bottom of the water collection chamber (21), the drain pump (5) being provided on the main drain opening (211).

10. The internal circulation drying system for the dishwasher according to claim 1, further comprising a temperature measuring device electrically connected to the controller, the temperature measuring device being disposed on the water chamber (22) for detecting the temperature of the water in the water chamber (22).

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