A dishwasher and a control method thereof

Abstract

The application discloses a dishwasher, which comprises a washing chamber and a drying device communicated with the washing chamber, and further comprises a heat recovery device capable of exchanging heat with the drying device, the heat recovery device being communicated with the washing chamber for heating washing water. By arranging the heat recovery device, the heat recovery device can recover and reuse the excessive heat of the drying device, and the recovered heat is used to heat the washing water, so that the energy consumption of the dishwasher is effectively reduced, and the dishwasher is more energy-saving and environment-friendly.

Description

Technical Field

[0001] This invention belongs to the field of home appliance technology, specifically, it relates to a dishwasher and its control method. Background Technology

[0002] Most existing dishwashers use a spray-type principle to wash dishes. To achieve better washing results, the water is usually heated during the main wash and rinse stages to increase the water temperature and rinse the dishes, thus achieving better washing performance and effect. The higher temperature water easily generates water vapor during the rinsing process, and during the drying stage, it is necessary to continuously reduce water vapor and lower humidity to achieve better drying performance and effect.

[0003] Chinese Patent Application No. 200980129498.9 discloses a dishwasher including an adsorption drying device within a submodule. The dishwasher includes at least one cleaning chamber and at least one drying device, wherein the drying device is used to dry cleaned items. The drying device includes at least one adsorption chamber (BEH) for receiving adsorbent material, particularly zeolite (ZEO), and at least one air guiding connection channel connected to the cleaning chamber (SB) to generate air exchange between the cleaning chamber (SB) and the adsorption chamber (BEH).

[0004] While the aforementioned patent solves the problem of drying tableware, the dishwasher requires heating during the desorption of the adsorbent material. After desorption, the adsorbent material still retains a high amount of heat, which is not recovered and utilized, resulting in high energy consumption for the dishwasher.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a dishwasher and its control method.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is: a dishwasher, including a washing chamber and a drying device communicating with the washing chamber, and further including a heat recovery device that can exchange heat with the drying device, the heat recovery device being connected to the washing chamber for heating the washing water.

[0008] Furthermore, the drying device includes a shell with an internal accommodating chamber, a reversible dehydration adsorbent disposed within the shell, and an adsorbent heating device for heating and decomposing the reversible dehydration adsorbent. The heat recovery device is disposed within the shell to recover the heat generated by the adsorbent heating device.

[0009] Furthermore, the dishwasher includes a circulating water pump, a first pipeline, and a second pipeline. The heat recovery device is a heat exchanger. The circulating water pump is connected to the heat exchanger through the first pipeline, and the hot water outlet of the heat exchanger is connected to the washing chamber through the second pipeline.

[0010] Furthermore, the dishwasher also includes a washing water heating device, a third pipe connecting the circulating water pump and the washing water heating device, and a fourth pipe connecting the washing water heating device and the second pipe.

[0011] Furthermore, a three-way control valve is installed on the first pipeline, and the third pipeline is connected to the three-way control valve.

[0012] Furthermore, the dishwasher also includes a temperature detection device for detecting the temperature inside the housing.

[0013] Furthermore, the dishwasher also includes a connecting pipe that connects the washing chamber and the housing, as well as a moisture delivery device disposed on the connecting pipe;

[0014] Preferably, the moisture conveying device is a fan.

[0015] The dishwasher also provides a control method for the dishwasher, wherein the dishwasher controls the washing water in the washing chamber to enter the heat recovery device for heating.

[0016] Furthermore, during the washing water heating stage of the dishwasher, the dishwasher controls the washing water in the washing chamber to enter the heat exchanger for heating.

[0017] Furthermore, during the washing water heating stage of the dishwasher, the dishwasher determines whether the desorption process of the reversible dehydrating adsorbent has ended. If so, it controls the circulating water pump to start and the three-way control valve connects the first pipeline to allow the washing water to enter the heat exchanger for heating.

[0018] If not, the circulating water pump will be turned on, and the three-way control valve will connect to the third pipeline to allow the washing water to enter the washing water heating device for heating.

[0019] Furthermore, during the washing water heating stage of the dishwasher, after the desorption process of the reversible dehydrating adsorbent is completed, the dishwasher determines whether the temperature inside the casing detected by the temperature detection device is greater than or equal to the preset temperature.

[0020] If so, the circulating water pump will be turned on, and the three-way control valve will connect the first pipeline to allow the washing water to enter the heat exchanger for heating.

[0021] If not, the circulating water pump will be turned on, and the three-way control valve will connect to the third pipeline to allow the washing water to enter the washing water heating device for heating.

[0022] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0023] 1. By setting up a heat recovery device, the present invention can recover and reuse the excess heat of the drying device, and use the recovered heat to heat the washing water, effectively reducing the energy consumption of the dishwasher and making the dishwasher more energy-efficient and environmentally friendly.

[0024] 2. The present invention is equipped with a temperature detection device for detecting the temperature inside the shell. When the temperature inside the shell is higher than or equal to the preset temperature, the washing water in the washing chamber is controlled to enter the heat exchanger for heating. When the temperature inside the shell is lower than the preset temperature, the washing water in the washing chamber is controlled to enter the washing water heating device for heating. The dishwasher achieves energy saving by making full use of the adsorption material to desorb the residual heat for heating the washing water without affecting the efficiency of the washing water heating.

[0025] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of the dishwasher of the present invention.

[0028] In the diagram: 1. Washing chamber; 2. Fan; 3. Connecting pipes; 4. Spray arm; 51. First pipe; 52. Second pipe; 53. Third pipe; 54. Fourth pipe; 6. Circulating water pump; 7. Three-way control valve; 8. Shell; 9. Reversible dehydration adsorbent; 10. Heat exchanger; 11. Adsorbent heating device; 12. Heater; 13. Drying module.

[0029] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] like Figure 1 As shown, this invention discloses a dishwasher, including a washing chamber 1 and a drying device communicating with the washing chamber 1, and further including a heat recovery device that can exchange heat with the drying device. The heat recovery device is connected to the washing chamber 1 and is used to heat the washing water. By incorporating the heat recovery device, this invention can recover and reuse excess heat from the drying device and use the recovered heat to heat the washing water, effectively reducing the dishwasher's energy consumption and making the dishwasher more energy-efficient and environmentally friendly.

[0034] Specifically, the drying device includes a shell 8 with an internal accommodating chamber, a reversible dehydrating adsorbent 9 disposed within the shell 8, and an adsorbent heating device 11 for heating and desorbing the reversible dehydrating adsorbent 9. A heat recovery device is disposed within the shell 8 to recover the heat generated by the adsorbent heating device 11. After desorption, the adsorbent still retains a significant amount of heat; the heat recovery device absorbs and utilizes this heat, preventing its waste and improving heat utilization efficiency.

[0035] The weight of the reversible dehydrating adsorbent 9 is such that it can absorb and dry the water in the dishwasher after the final rinsing stage, ensuring the drying effect of the dishwasher, while avoiding an increase in the heat required for the desorption process due to excessive reversible dehydrating adsorbent 9, which would increase energy consumption.

[0036] The reversible dehydrating adsorbent 9 can be zeolite. To increase drying efficiency, the zeolite is in the form of loose zeolite particles, increasing the contact area between air and zeolite. The housing 8 has an air inlet and an air outlet, ensuring that both the air inlet and outlet are filled with zeolite particles. This guarantees contact between the humid air and the zeolite particles. The zeolite particles adsorb moisture from the humid air, while simultaneously generating a large amount of heat, turning the humid air into dry, hot air that enters the washing chamber 1. This hot air then carries away moisture from the washing chamber 1 for further absorption and drying, and the cycle repeats. This thoroughly dries the dishes in the dishwasher, significantly shortening the drying time.

[0037] After the dishes in the dishwasher are dried, the zeolite can be desorbed and regenerated by heating with the adsorbent heating device 11 for reuse. The desorption process takes place after the next washing cycle begins. The remaining heat after the zeolite desorption is completed can be recovered by the heat recovery device to heat the washing water, preventing heat waste. After the washing cycle begins, the dishwasher control device controls the adsorbent heating device 11 to heat and desorb the zeolite in the housing 8, causing the water in the zeolite to evaporate into water vapor. The water vapor enters the washing chamber 1, mixes with the washing water, and condenses. The heat released by condensation preheats the washing water, saving the heat required for heating the washing water, increasing the heating efficiency of the washing water, shortening the washing time of the entire washing cycle, increasing washing efficiency, and improving the user experience. It should be noted that the adsorbent heating device 11 can be located inside or outside the housing 8. The adsorbent heating device 11 can be a heating element or other heating elements without limitation, as long as it can heat the zeolite in the housing 8.

[0038] The dishwasher includes a circulating water pump 6, a first pipe 51, and a second pipe 52. The heat recovery device is a heat exchanger 10. The circulating water pump 6 is connected to the heat exchanger 10 via the first pipe 51, and the hot water outlet of the heat exchanger 10 is connected to the washing chamber 1 via the second pipe 52. The dishwasher includes an inner tub with a washing chamber 1. A water tank for storing washing water is located at the bottom of the inner tub, and the water tank is connected to the washing chamber 1. The circulating water pump 6 includes an inlet and an outlet. The inlet of the circulating water pump 6 is connected to the water tank via a pipe, and the outlet of the circulating water pump 6 is connected to the heat exchanger via the first pipe 51. The hot water outlet of the heat exchanger is connected to the spray arm 4 located inside the inner tub via the second pipe 52. After the zeolite desorption is completed, the dishwasher's control device controls the circulating water pump 6 to start, drawing cold water from the water tank into the heat exchanger to absorb the remaining heat from the zeolite desorption and heat it. Then, the water enters the spray arm 4 via the second pipe 52 to spray and wash the dishes. This technology utilizes the heat generated by zeolite desorption to heat the wash water, eliminating the need for or reducing the use of additional heat sources, thus lowering the dishwasher's energy consumption.

[0039] In another embodiment, the dishwasher also includes a washing water heating device, a third pipe 53 connecting the circulating water pump 6 and the washing water heating device, and a fourth pipe 54 connecting the washing water heating device and the washing chamber 1. Specifically, the heating device is a heater 12, which includes a water storage chamber and a heating element disposed within the water storage chamber. The fourth pipe 54 is connected to the spray arm 4. When the remaining heat from the zeolite desorption is absorbed to a level below acceptable, the control device controls the heating element to be energized to begin heating. Simultaneously, the control device controls the washing pump to draw cold water from the tank into the water storage chamber of the water heater for heating. After heating, the water enters the spray arm 4 through the fourth pipe 54 to spray and wash the dishes. This ensures that the heat generated by the zeolite desorption in the dishwasher is fully utilized without affecting the heating of the washing water, thus maintaining the washing effect while saving energy.

[0040] To avoid having multiple interfaces on the spray arm 4, the fourth pipe 54 is connected to the second pipe 52 and the washing water heating device to connect the washing water heating device and the spray arm 4. This eliminates the need to modify the spray arm 4 and saves on the production cost of the dishwasher.

[0041] Furthermore, a three-way control valve 7 is installed on the first pipeline 51, and the third pipeline 53 is connected to the three-way control valve 7. The three-way control valve 7 is electrically connected to the dishwasher's control device, which controls the washing water to enter the heat recovery device for heating or to enter the washing water heating device for heating by controlling the three-way valve.

[0042] The dishwasher also includes a temperature detection device for detecting the temperature inside the housing 8. The temperature detection device monitors the temperature inside the housing 8. When the remaining heat from the zeolite desorption is greater than or equal to a preset temperature, the dishwasher's control device controls the three-way control valve 7 to connect to the first pipe 51, pumping the washing water into the heat exchanger 10 for heating. When the remaining heat from the zeolite desorption is less than the preset temperature, the dishwasher's control device controls the three-way valve to cut off the first pipe 51 and connect to the third pipe 53, pumping the washing water into the heater 12 for heating. This prevents the dishwasher from continuing to heat the washing water in the heat exchanger 10 when the temperature inside the housing 8 is insufficient to heat the washing water, thus affecting the washing effect.

[0043] The dishwasher also includes a connecting pipe 3 connecting the washing chamber 1 and the housing 8, and a moisture conveying device disposed on the connecting pipe 3. Preferably, the moisture conveying device is a fan 2. Air inlets and outlets are provided at both ends of the housing 8. An outlet is provided on the upper part of the side wall of the inner tub, and an air inlet is provided on the bottom wall of the inner tub. The connecting pipe 3 connects the outlet of the inner tub and the inlet of the housing 8, and vice versa. The outlet of the inner tub is located at the upper part of the inner tub to prevent moisture from the bottom of the inner tub or the water tank from entering the housing 8 for drying, thus affecting the drying efficiency of the tableware. The fan 2 is disposed on the connecting pipe 3 between the outlet of the inner tub and the inlet of the housing 8. It draws humid air from the inner tub into the housing 8, allowing the humid air to come into contact with the zeolite. The zeolite absorbs the moisture in the humid air and releases heat, turning the humid air into dry hot air. The dry hot air re-enters the inner tub, carrying away the moisture again, and this cycle continues, allowing the tableware in the inner tub to dry quickly.

[0044] In another embodiment, a control valve is installed on the connecting pipe 3 of the dishwasher to control the opening and closing of the connecting pipe 3. During the non-drying stage of the dishwasher, the control device controls the control valve to close to prevent humid air in the inner tub from entering the shell 8 and contacting the zeolite. During the drying stage of the dishwasher, the control device controls the control valve to open the connecting pipe 3, thereby connecting the inner tub and the shell 8. At the same time, the fan 2 is controlled to start working to draw humid air in the inner tub into the shell 8 to contact the zeolite for drying. The zeolite absorbs the moisture carried in the humid air and releases heat, turning the humid air into dry air with a higher temperature. The dry air with a higher temperature re-enters the inner tub through the connecting pipe 3, and this cycle is repeated to dry the washed dishes. By installing a control valve on the connecting pipe 3, the connection between the inner tub and the drying device can be controlled to prevent humid air in the dishwasher from still entering the shell 8 through the connecting pipe 3 and contacting the zeolite during the non-drying stage. This would reduce or eliminate the zeolite's ability to absorb moisture during the drying stage, affecting the drying effect of the dishwasher on the dishes. Alternatively, in order not to affect the dishwasher's drying effect on the dishes, enough zeolite can be placed inside the casing 8. However, the desorption of zeolite requires a lot of heat, which increases the energy consumption of the dishwasher.

[0045] In another embodiment, the dishwasher is further equipped with a humidity detection device for detecting the humidity inside the inner tub, which is electrically connected to the dishwasher's control unit. Specifically, the humidity detection device is a humidity sensor installed inside the inner tub. When the drying stage of the dishwasher begins, the control unit obtains the humidity information inside the inner tub through the humidity sensor. When the humidity inside the inner tub reaches the preset humidity, the dishwasher's control unit controls the control valve to close, the fan 2 to stop working, drying is complete, the dishwasher is shut off, and the dishwashing is finished. The humidity detection device prevents the fan 2 from continuing to circulate air in the inner tub and drying unit after the dishes have finished drying, thus preventing increased energy consumption of the dishwasher.

[0046] In another embodiment, an independent drying module 13 can be set at the bottom of the washing machine, integrating the drying device, moisture conveying device, washing water heating device, three-way control valve 7, and circulating water pump 6 into the drying module 13, so that it can be assembled as an independent module of the dishwasher, increasing the compactness of the dishwasher and not occupying the side space of the dishwasher and affecting the space of the washing chamber 1.

[0047] This invention also discloses the control method of the dishwasher described above. After the washing stage of the dishwasher ends, the drying stage begins. The control device of the dishwasher controls the control valve to open to connect the connecting pipe 3 and then connect the inner tub and the shell 8. At the same time, the fan 2 is controlled to start working for a certain period of time to draw the humid air in the inner tub into the shell 8 to contact the zeolite for drying. After the zeolite absorbs the moisture carried in the humid air, it releases heat and turns the humid air into dry air with a higher temperature. The dry air with a higher temperature re-enters the inner tub through the connecting pipe 3. This cycle is repeated to dry the washed tableware and prevent the tableware from being damp and easily breeding bacteria.

[0048] In another embodiment, after the dishwasher's washing phase ends, the drying phase begins. The dishwasher's control device opens the control valve to connect the connecting pipe 3, which in turn connects the inner tub and the outer shell 8. Simultaneously, it controls the fan 2 to start operating. The control device obtains humidity information from the inner tub via a humidity sensor. When the humidity in the inner tub reaches the preset humidity, the control device closes the control valve, the fan 2 stops operating, drying is complete, and the dishwasher shuts off, ending the dishwashing process. This prevents the fan 2 from continuing to operate and circulate air between the inner tub and the drying unit after the dishes have dried, thus reducing the dishwasher's energy consumption.

[0049] When the dishwasher starts working, the adsorbent heating device 11 is controlled to heat the zeolite, causing the water in the zeolite to be desorbed and released as high-temperature water vapor. At the same time, the control valve is opened to connect the third pipe 3, allowing the high-temperature water vapor to enter the inner tank, preheating the washing water, increasing the washing water temperature, shortening the heating time of the washing water, and reducing energy consumption.

[0050] Furthermore, the dishwasher's control device controls the washing water in the washing chamber 1 to enter the heat recovery device for heating. This allows the cold water in the dishwasher to enter the heat recovery device for heating, making full use of the heat generated by zeolite desorption and avoiding waste of the heat generated by zeolite desorption. At the same time, it eliminates the need for other heat sources to heat the washing water or reduces the use of other heat sources, thereby reducing the dishwasher's energy consumption.

[0051] In one embodiment, during the washing water heating stage of the dishwasher, the dishwasher controls the circulating water pump 6 to start, and the three-way valve 7 connects to the first pipeline 51 to allow the washing water to enter the heat exchanger 10 for heating. The adsorbent heating device 11 simultaneously heats the zeolite and the washing water. The heat generated by the adsorbent heating device 11 can both heat the zeolite to desorb it and heat the washing water, making full use of heat and eliminating the need for a separate heater 12 in the dishwasher, thus reducing the manufacturing cost of the dishwasher.

[0052] In another embodiment, during the washing water heating stage of the dishwasher, the dishwasher determines whether the desorption process of the reversible dehydrating adsorbent 9 has ended.

[0053] If so, the circulating water pump 6 is turned on, and the three-way control valve 7 connects to the first pipeline 51 to allow the washing water to enter the heat exchanger 10 for heating.

[0054] If not, the circulating water pump 6 is turned on, and the three-way control valve 7 connects to the third pipeline 53 to allow the washing water to enter the washing water heating device for heating. This prevents the washing water in the dishwasher from entering the heat exchanger 10 for heating before the desorption of the reversible dehydrating adsorbent 9 is complete, which would affect the desorption of the reversible dehydrating adsorbent 9. It also prevents the dishwasher from entering the drying cycle before the desorption of the reversible dehydrating adsorbent 9 is complete, thus affecting the drying of the dishes and extending the overall washing time, thus impacting the user experience.

[0055] Furthermore, during the washing water heating stage of the dishwasher, after the desorption process of the reversible dehydrating adsorbent 9 is completed, the dishwasher determines whether the temperature inside the casing 8 detected by the temperature detection device is greater than or equal to the preset temperature.

[0056] If so, the circulating water pump 6 is turned on, and the three-way control valve 7 connects to the first pipeline 51 to allow the washing water to enter the heat exchanger 10 for heating.

[0057] If not, the circulating water pump 6 is turned on, and the three-way control valve 7 connects to the third pipe 53, allowing the washing water to enter the washing water heating device for heating. To prevent the dishwasher from continuing to heat the washing water in the heat exchanger 10 if the temperature inside the casing 8 is insufficient to heat the washing water, thus affecting the washing effect, the dishwasher's control device controls the three-way control valve 7 to connect to the first pipe 51, pumping the washing water into the heat exchanger 10 for heating. This utilizes the heat generated by zeolite desorption, eliminating the need for an additional heat source and effectively reducing the dishwasher's energy consumption. When the remaining heat from zeolite desorption is less than the preset temperature, the dishwasher's control device controls the three-way valve to cut off the connection between the first pipe 51 and the third pipe 53, pumping the washing water into the heater 12 for heating. This does not affect the washing effect of the dishwasher.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A dishwasher, comprising an inner tub having a washing chamber and a drying device communicating with the washing chamber, wherein a water tank for storing washing water is disposed at the bottom of the inner tub, the water tank communicating with the washing chamber, characterized in that: It also includes a heat recovery device that can exchange heat with the drying device, the heat recovery device being connected to the washing chamber for heating the washing water; The drying device includes a shell with an internal cavity, a reversible dehydration adsorbent disposed within the shell, and an adsorbent heating device for heating and decomposing the reversible dehydration adsorbent. The heat recovery device is disposed within the shell to recover the heat generated by the adsorbent heating device. The reversible dehydration adsorbent is zeolite. The dishwasher includes a circulating water pump, a first pipeline and a second pipeline. The heat recovery device is a heat exchanger. The circulating water pump includes an inlet and an outlet. The inlet of the circulating water pump is connected to the water tank through a pipeline. The outlet of the circulating water pump is connected to the heat exchanger through the first pipeline. The hot water outlet of the heat exchanger is connected to the washing chamber through the second pipeline. The dishwasher also includes a washing water heating device, a third pipeline connecting the circulating water pump and the washing water heating device, and a fourth pipeline connecting the washing water heating device and the second pipeline; the heating device is a heater, which includes a water storage chamber and heating elements disposed within the water storage chamber. When the remaining heat from the desorption of the zeolite is less than the preset temperature, the control device controls the heating element to be energized and start heating. At the same time, the control device controls the washing pump to pump the cold water in the water tank into the water storage chamber for heating. After heating is completed, the water enters the spray arm through the fourth pipeline to spray and wash the tableware.

2. The dishwasher according to claim 1, characterized in that: A three-way control valve is installed on the first pipeline, and the third pipeline is connected to the three-way control valve.

3. The dishwasher according to claim 1, characterized in that: The dishwasher also includes a temperature detection device for detecting the temperature inside the housing.

4. A control method for a dishwasher as described in any one of claims 1-3, characterized in that: The dishwasher controls the washing water in the washing chamber to enter the heat recovery device for heating.

5. The control method according to claim 4, characterized in that: During the washing water heating stage of the dishwasher, the dishwasher controls the washing water in the washing chamber to enter the heat exchanger for heating.

6. The control method according to claim 5, characterized in that: During the washing water heating stage of the dishwasher, the dishwasher determines whether the desorption process of the reversible dehydrating adsorbent has ended. If so, the circulating water pump will be turned on, and the three-way control valve will connect the first pipeline to allow the washing water to enter the heat exchanger for heating. If not, the circulating water pump will be turned on, and the three-way control valve will connect to the third pipeline to allow the washing water to enter the washing water heating device for heating.

7. The control method according to claim 6, characterized in that: During the washing water heating stage of the dishwasher, the desorption process of the reversible dehydrating adsorbent ends. The dishwasher then determines whether the temperature inside the casing, detected by the temperature detection device, is greater than or equal to the preset temperature. If so, the circulating water pump will be turned on, and the three-way control valve will connect the first pipeline to allow the washing water to enter the heat exchanger for heating. If not, the circulating water pump will be turned on, and the three-way control valve will connect to the third pipeline to allow the washing water to enter the washing water heating device for heating.

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