阅读说明：本技术 一种洗碗机及其控制方法 (Dish washing machine and control method thereof ) 是由 陶现民 解婷 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种洗碗机,包括洗涤腔室和与洗涤腔室连通的干燥装置,还包括可与所述干燥装置进行热量交换的热回收装置,热回收装置与所述洗涤腔室相通用于加热洗涤水。本发明通过设置热回收装置,热回收装置可以回收再利用干燥装置的多余热量,并且利用回收的热量加热洗涤水,有效降低洗碗机的能耗,使洗碗机更加节能环保。(The invention discloses a dishwasher, which comprises a washing chamber, a drying device communicated with the washing chamber, and a heat recovery device capable of exchanging heat with the drying device, wherein the heat recovery device is communicated with the washing chamber and used for heating washing water. According to the invention, the heat recovery device is arranged, the heat recovery device can recycle the redundant heat of the drying device, and the recovered heat is used for heating the washing water, so that the energy consumption of the dish washing machine is effectively reduced, and the dish washing machine is more energy-saving and environment-friendly.)

1. A dishwasher comprising a washing chamber and drying means in communication with the washing chamber, characterized in that: the washing device also comprises a heat recovery device which can exchange heat with the drying device, and the heat recovery device is communicated with the washing chamber and is used for heating the washing water.

2. The dishwasher of claim 1, wherein: the drying device comprises a shell with a containing chamber inside, a reversible dehydration adsorbent arranged in the shell and an adsorbent heating device for heating the desorption reversible dehydration adsorbent, and the heat recovery device is arranged in the shell to recover heat generated by the adsorbent heating device.

3. The dishwasher of claim 1, wherein: the dishwasher comprises a circulating water pump, a first pipeline and a second pipeline, the heat recovery device is a heat exchanger, the circulating water pump is communicated with the heat exchanger through the first pipeline, and a hot water outlet end of the heat exchanger is communicated with a washing chamber through the second pipeline.

4. The dishwasher of claim 3, wherein: the dishwasher further comprises a washing water heating device, a third pipeline communicated with the circulating water pump and the washing water heating device, and a fourth pipeline communicated with the washing water heating device and the second pipeline.

5. The dishwasher of claim 4, wherein: the first pipeline is provided with a three-way control valve, and the third pipeline is communicated with the three-way control valve.

6. The dishwasher of claim 2, wherein: the dishwasher further comprises a temperature detection device for detecting a temperature within the housing.

7. A control method of a dishwasher according to any one of claims 1 to 6, characterized in that: the dishwasher controls the washing water in the washing chamber to enter the heat recovery device for heating.

8. The control method according to claim 7, characterized in that: and in the washing water heating stage of the dish washing machine, the dish washing machine controls the washing water in the washing chamber to enter the heat exchanger for heating.

9. The control method according to claim 8, characterized in that: in the washing water heating stage of the dish-washing machine, the dish-washing machine judges whether the desorption process of the reversible dehydration adsorbent is finished or not,

if so, controlling the circulating water pump to be started, and communicating the three-way control valve with the first pipeline to enable the washing water to enter the heat exchanger for heating;

if not, the circulating water pump is controlled to be started, and the three-way control valve is communicated with the third pipeline to enable the washing water to enter the washing water heating device for heating.

10. The control method according to claim 9, characterized in that: in the washing water heating stage of the dish-washing machine, the desorption process of the reversible dehydration adsorbent is finished, the dish-washing machine judges whether the temperature in the shell detected by the temperature detection device is greater than or equal to the preset temperature or not,

if so, controlling the circulating water pump to be started, and communicating the three-way control valve with the first pipeline to enable the washing water to enter the heat exchanger for heating;

if not, the circulating water pump is controlled to be started, and the three-way control valve is communicated with the third pipeline to enable the washing water to enter the washing water heating device for heating.

Technical Field

The invention belongs to the technical field of household appliances, and particularly relates to a dish-washing machine and a control method thereof.

Background

Most of the existing dish-washing machines adopt a spray-type principle to wash tableware, and in order to achieve a better washing effect, water is generally heated in the main washing stage and the rinsing stage, so that the temperature of the water is increased to wash the tableware, and the better washing performance and effect are achieved. The water with higher temperature is easy to generate steam in the process of washing the tableware, and the steam must be continuously reduced in the drying stage of washing to reduce the humidity, so that better drying performance and effect are achieved.

Chinese patent application No. 200980129498.9 discloses a dishwasher comprising an adsorption drying device in a submodule, comprising at least one washing compartment and at least one drying device, wherein the drying device is used for drying cleaned items, the drying device comprises at least one adsorption compartment (BEH) for receiving an adsorption material, in particular Zeolite (ZEO), and at least one air-conducting connecting channel is connected to the washing compartment (SB) for creating an air exchange between the washing compartment (SB) and the adsorption compartment (BEH).

Although the problem of tableware drying is solved in the above patent, this dish washer need heat when the adsorbed material desorption, and the adsorbed material still can have higher heat after the desorption is accomplished, and above-mentioned heat does not carry out recycle, has the higher problem of dish washer energy consumption.

The present invention has been made in view of this situation.

Disclosure of Invention

The invention provides a dishwasher and a control method thereof, aiming at overcoming the defects of the prior art.

In order to solve the technical problems, the invention adopts the technical scheme that: a dishwasher comprises a washing chamber, a drying device communicated with the washing chamber, and a heat recovery device capable of exchanging heat with the drying device, wherein the heat recovery device is communicated with the washing chamber and used for heating washing water.

Further, the drying device comprises a shell with a containing chamber inside, a reversible dehydration adsorbent arranged in the shell and an adsorbent heating device for heating the desorption reversible dehydration adsorbent, and the heat recovery device is arranged in the shell to recover heat generated by the adsorbent heating device.

Further, the dishwasher comprises a circulating water pump, a first pipeline and a second pipeline, the heat recovery device is a heat exchanger, the circulating water pump is communicated with the heat exchanger through the first pipeline, and a hot water outlet end of the heat exchanger is communicated with the washing chamber through the second pipeline.

Further, the dishwasher further includes a washing water heating device, a third pipeline communicating the circulation water pump and the washing water heating device, and a fourth pipeline communicating the washing water heating device and the second pipeline.

Furthermore, a three-way control valve is arranged on the first pipeline, and the third pipeline is communicated with the three-way control valve.

Further, the dishwasher further comprises a temperature detection device for detecting a temperature within the housing.

Further, the dishwasher further comprises a connection pipeline for communicating the washing chamber and the housing, and a moisture delivery device disposed on the connection pipeline;

preferably, the moisture delivery device is a fan.

The control method of the dishwasher is also provided, and the dishwasher controls the washing water in the washing chamber to enter the heat recovery device for heating.

Further, in the washing water heating stage of the dish washing machine, the dish washing machine controls the washing water in the washing chamber to enter the heat exchanger for heating.

Further, in the washing water heating stage of the dish washing machine, the dish washing machine judges whether the desorption process of the reversible dehydration adsorbent is finished or not, if so, the circulating water pump is controlled to be started, and the three-way control valve is communicated with the first pipeline to enable the washing water to enter the heat exchanger for heating;

if not, the circulating water pump is controlled to be started, and the three-way control valve is communicated with the third pipeline to enable the washing water to enter the washing water heating device for heating.

Further, in the washing water heating stage of the dishwasher, the desorption process of the reversible dehydration adsorbent is finished, the dishwasher judges whether the temperature in the housing detected by the temperature detecting means is greater than or equal to a preset temperature,

if so, controlling the circulating water pump to be started, and communicating the three-way control valve with the first pipeline to enable the washing water to enter the heat exchanger for heating;

if not, the circulating water pump is controlled to be started, and the three-way control valve is communicated with the third pipeline to enable the washing water to enter the washing water heating device for heating.

After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.

1. According to the invention, the heat recovery device is arranged, the heat recovery device can recycle the redundant heat of the drying device, and the recovered heat is used for heating the washing water, so that the energy consumption of the dish washing machine is effectively reduced, and the dish washing machine is more energy-saving and environment-friendly.

2. The invention is provided with the temperature detection device for detecting the temperature in the shell, when the temperature in 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 in 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, and the dish washing machine does not influence the efficiency of the washing water heating on the basis of fully utilizing the residual heat of the absorption material to desorb for heating the washing water to realize energy saving.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic view of the structure of a dishwasher according to the present invention.

In the figure: 1. a washing chamber; 2. a fan; 3. connecting a pipeline; 4. a spray arm; 51. a first pipeline; 52. a second pipeline; 53. a third pipeline; 54. a fourth pipeline; 6. a water circulating pump; 7. a three-way control valve; 8. a housing; 9. a reversible dehydration adsorbent; 10. a heat exchanger; 11. an adsorbent heating device; 12. a heater; 13. and (7) drying the module.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, 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 drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the present invention discloses a dishwasher, comprising a washing chamber 1 and a drying device communicated with the washing chamber 1, and further comprising a heat recovery device capable of exchanging heat with the drying device, wherein the heat recovery device is communicated with the washing chamber 1 for heating washing water. According to the invention, the heat recovery device is arranged, the heat recovery device can recycle the redundant heat of the drying device, and the recovered heat is used for heating the washing water, so that the energy consumption of the dish washing machine is effectively reduced, and the dish washing machine is more energy-saving and environment-friendly.

Specifically, the drying device includes a housing 8 having a housing chamber therein, a reversible dehydration adsorbent 9 disposed in the housing 8, and an adsorbent heating device 11 for heating and desorbing the reversible dehydration adsorbent 9, and the heat recovery device is disposed in the housing 8 to recover heat generated by the adsorbent heating device 11. The adsorbent has higher heat after desorption, and the heat recovery device can absorb and utilize the part of heat, thereby avoiding the waste of the part of heat and improving the utilization rate of heat.

The weight of the reversible dehydration adsorbent 9 ensures that the reversible dehydration adsorbent 9 can absorb and dry the water in the dish-washing machine after the final washing stage of the dish-washing machine is finished, so that the drying effect of the dish-washing machine is ensured, and the increase of the required heat in the desorption process and the increase of energy consumption caused by the excessive reversible dehydration adsorbent 9 are avoided.

The reversible dehydration adsorbent 9 can be zeolite, in order to increase drying efficiency, the zeolite is loose zeolite particles, the contact area between air and the zeolite is increased, the shell 8 is provided with an air inlet and an air outlet, at least the air inlet and the air outlet of the shell 8 are filled with the zeolite particles, wet air is ensured to be in contact with the zeolite particles, the zeolite particles adsorb moisture in the wet air, simultaneously the zeolite generates a large amount of heat, the wet air is changed into dry hot air to enter the washing chamber 1, the hot air carries the moisture in the washing chamber 1 again to be absorbed and dried, and the process is circulated. The tableware in the dish washer is thoroughly dried, and the drying time of the tableware is obviously shortened.

After the tableware in the dishwasher is dried, the zeolite can be heated by the adsorbent heating device 11 to be desorbed and regenerated for reuse, and the desorption process is carried out after the next washing process is started. The residual heat after zeolite desorption can be recycled by the heat recovery device to heat the washing water, so that the waste of heat is prevented. The controlling means control adsorbent heating device 11 of dish washer carries out the heating desorption to the zeolite in the casing 8 after the washing process begins, make the moisture evaporation in the zeolite be vapor, vapor gets into and mixes the condensation with the washing water in the washing chamber 1, the heat that the condensation released preheats the washing water, save the required heat of washing water heating, increase washing water heating efficiency, shorten the washing time of whole washing process, increase washing efficiency, improve user's use experience. It should be noted that, in the present invention, the adsorbent heating device 11 is disposed inside the housing 8 or outside the housing 8, and the adsorbent heating device 11 may be a heating element such as a heating sheet or other heating elements, which is not limited as long as the zeolite inside the housing 8 can be heated.

The dishwasher comprises a circulating water pump 6, a first pipeline 51 and a second pipeline 52, the heat recovery device is a heat exchanger 10, the circulating water pump 6 is communicated with the heat exchanger 10 through the first pipeline 51, and a hot water outlet end of the heat exchanger 10 is communicated with the washing chamber 1 through the second pipeline 52. The dish washer comprises an inner container, wherein the inner container is provided with a washing chamber 1, the bottom of the inner container is provided with a water tank for storing washing water, and the water tank is communicated with the washing chamber 1. The circulating water pump 6 comprises a water inlet and a water outlet, the water inlet of the circulating water pump 6 is communicated with the water tank through a pipeline, the water outlet of the circulating water pump 6 is communicated with the heat exchanger through a first pipeline 51, and a second pipeline 52 through which a hot water outlet end of the heat exchanger is communicated with the spray arm 4 arranged in the liner. After the zeolite desorption is finished, the control device of the dishwasher controls the circulating water pump 6 to be started to pump cold water in the water tank into the heat exchanger to absorb the residual heat after the zeolite desorption is finished for heating, and then the cold water enters the spraying arm 4 through the second pipeline 52 to spray and wash the tableware. The washing water is heated by utilizing the heat generated by zeolite desorption, so that the washing water is heated without an additional heat source or the use of the additional heat source is reduced, and the energy consumption of the dish-washing machine is reduced.

As another embodiment, the dishwasher further comprises a washing water heating means, a third pipe 53 communicating the circulation water pump 6 and the washing water heating means, and a fourth pipe 54 communicating the washing water heating means and the washing chamber 1. Specifically, the heating device is a heater 12, the heater 12 includes a water storage chamber and a heating plate disposed in the water storage chamber, and the fourth pipeline 54 is communicated with the spray arm 4. When the residual heat of zeolite desorption is absorbed to a value not reaching the standard, the control device controls the heating sheet to be electrified to start heating, and simultaneously controls the washing pump to pump cold water in the water tank into the water storage cavity of the water heater to heat, and the cold water enters the spraying arm 4 through the fourth pipeline 54 after heating to spray and wash the tableware. After the heat generated by zeolite desorption of the dish-washing machine is utilized, the heating of washing water is not influenced, and the washing effect of the dish-washing machine is ensured while the energy of the dish-washing machine is saved.

In order to avoid the arrangement of a plurality of interfaces on the spray arm 4, the fourth pipeline 54 is communicated with the washing water heating device through the second pipeline 52 and the washing water heating device, so that the spray arm 4 does not need to be modified, and the production cost of the dishwasher is saved.

Furthermore, a three-way control valve 7 is arranged on the first pipeline 51, and the third pipeline 53 is communicated with the three-way control valve 7. The three-way control valve 7 is electrically connected with a control device of the dish washing machine, and the control device of the dish washing machine controls the washing water to enter the heat recovery device for heating or enter the washing water heating device for heating through a control three-way valve.

The dishwasher further comprises temperature detection means for detecting the temperature inside said housing 8. The temperature detecting device detects the temperature in the shell 8, when the residual heat of zeolite desorption is larger than or equal to the preset temperature, the control device of the dishwasher controls the three-way control valve 7 to be communicated with the first pipeline 51 and pumps the washing water into the heat exchanger 10 for heating, and when the residual heat of zeolite desorption is smaller than the preset temperature, the control device of the dishwasher controls the three-way valve to cut off the first pipeline 51 to be communicated with the third pipeline 53 and pumps the washing water into the heater 12 for heating. When the temperature in the shell 8 is not enough to heat the washing water, the dishwasher still controls the washing water to enter the heat exchanger 10 for heating, and the washing effect of the dishwasher is prevented from being influenced.

The dishwasher further comprises a connecting line 3 communicating the washing chamber 1 and the housing 8, and a moisture delivery device, preferably a fan 2, arranged on the connecting line 3. 8 both ends of casing set up air inlet and gas outlet, and the lateral wall upper portion of the inner bag of dish washer sets up the gas outlet, and the diapire of inner bag sets up the air inlet, and connecting line 3 communicates the gas outlet of inner bag and the air inlet of casing 8, the gas outlet of casing 8 and the air inlet of inner bag. The gas outlet setting of inner bag is on the upper portion of inner bag, and the moisture of avoiding the inner bag bottom or the moisture in the basin gets into casing 8 and carries out the drying, influences the drying efficiency of tableware. The fan 2 sets up on the gas outlet of inner bag and the connecting line 3 of the air inlet of casing 8, makes humid air and zeolite contact in the humid air suction casing 8 in with the inner bag, and the moisture in the zeolite absorption humid air gives off the heat simultaneously and makes humid air become dry hot-air, and dry hot-air gets into the inner bag again, carries the moisture discharge in the dishwasher inner bag once more, so circulation, makes the tableware rapid draing in the inner bag.

In another embodiment, a control valve for controlling the on-off of the connecting pipeline 3 is arranged on the connecting pipeline 3 of the dishwasher, and in the non-drying stage of the dishwasher, the control device of the dishwasher controls the control valve to be closed to prohibit the wet air in the inner container from entering the shell 8 to be contacted with the zeolite. The drying stage of dish washer, the controlling means control valve of dish washer is opened and then is switched on inner bag and casing 8 with switch on connecting tube 3, and control fan 2 begins work simultaneously and carries out the drying with the zeolite contact in the humid air suction casing 8 in, it becomes the dry air that has higher temperature to release heat behind the moisture that carries among the zeolite absorption humid air, the dry air that has higher temperature passes through connecting tube 3 again and gets into in the inner bag, the tableware that so circulation was reciprocal will washed is dried. Through set up the control valve on connecting line 3, realize the control to inner bag and drying device's intercommunication or interrupt intercommunication, avoid the non-drying stage of dish washer, wet air in the dish washer still gets into casing 8 and zeolite contact through connecting line 3, causes the ability decline of the adsorption of moisture of the drying stage zeolite of dish washer or disappears, influences the drying effect of dish washer to the tableware. Or, in order not to influence the drying effect of the dish-washing machine on the tableware, enough zeolite is arranged in the shell 8, and a large amount of heat is needed when the zeolite is desorbed, so that the energy consumption of the dish-washing machine is increased.

In another embodiment, the dishwasher is further provided with a humidity detection device for detecting the humidity in the inner container, and the humidity detection device is electrically connected with the control device of the dishwasher. Specifically, the humidity detection device is a humidity sensor arranged in the inner container. After the drying stage of the dish-washing machine is started, the control device obtains humidity information in the inner container through the humidity sensor, when the humidity in the inner container reaches the preset humidity, the control device of the dish-washing machine controls the control valve to be closed, the fan 2 stops working, the drying is completed, the dish-washing machine is controlled to be closed, and the washing of the tableware is finished. The arrangement of the humidity detection device prevents the fan 2 from working and circulating the air of the inner container and the drying device after the tableware is dried, and the energy consumption of the dish washing machine is increased.

In another embodiment, a separate drying module 13 may be disposed at the bottom of the washing machine, and the drying device, the moisture delivery device, the washing water heating device, the three-way control valve 7, and the circulating water pump 6 are integrally disposed to the drying module 13, so that it may be integrally assembled as a separate module of the dishwasher, increasing the compactness of the dishwasher, and not occupying the lateral space of the dishwasher to affect the space of the washing chamber 1.

The invention also discloses a control method of the dish washing machine, the washing stage of the dish washing machine is finished, the drying stage is started, the control device of the dish washing machine controls the control valve to be opened to conduct the connecting pipeline 3 so as to conduct the inner container and the shell 8, meanwhile, the fan 2 is controlled to start working for a certain time, the wet air in the inner container is pumped into the shell 8 to be contacted with the zeolite for drying, the zeolite absorbs moisture carried in the wet air and releases heat to change the wet air into dry air with higher temperature, the dry air with higher temperature enters the inner container again through the connecting pipeline 3, the washed tableware is dried in a circulating reciprocating mode, and the phenomenon that the humidity of the tableware is easy to breed bacteria is prevented.

In another embodiment, the washing stage of the dishwasher is finished, the drying stage is started, the control device of the dishwasher controls the control valve to be opened to conduct the connecting pipeline 3 so as to conduct the inner container and the shell 8, and simultaneously controls the fan 2 to start working, the control device obtains humidity information in the inner container through the humidity sensor, when the humidity in the inner container reaches the preset humidity, the control device of the dishwasher controls the control valve to be closed, the fan 2 stops working, the drying is finished, the dishwasher is controlled to be closed, and the tableware washing is finished. After the tableware is dried, the fan 2 still works to circulate the air in the inner container and the drying device, and the energy consumption of the dish washing machine is increased.

When the dishwasher starts to work, the adsorbent heating device 11 is controlled to heat, so that water in zeolite is desorbed by zeolite and is changed into high-temperature water vapor to be discharged, and meanwhile, the control valve is controlled to open and conduct the third pipeline 3, so that the high-temperature water vapor enters the inner container to preheat the washing water, the temperature of the washing water is increased, the heating time of the washing water is shortened, and the energy consumption is reduced.

Further, the control device of the dishwasher controls the dishwasher to control the washing water in the washing chamber 1 to enter the heat recovery device for heating. The cold water in the dish washer enters the heat recovery device to be heated, the heat generated by zeolite desorption is fully utilized, the waste of the heat generated by zeolite desorption is avoided, and meanwhile, other heat sources are not needed to heat washing water or reduce the use of other heat sources, so that the energy consumption of the dish washer is reduced.

In one embodiment, during the heating phase of the washing water of the dishwasher, the dishwasher controls the circulating water pump 6 to be opened, the three-way valve 7 is communicated with the first pipeline 51 to enable the washing water to enter the heat exchanger 10 for heating, and the adsorbent heating device 11 simultaneously heats the zeolite and the washing water. The heat generated by the adsorbent heating device 11 can heat the zeolite to desorb the zeolite and heat the washing water at the same time, thereby making full use of the heat, omitting the arrangement of the heater 12 of the dishwasher and reducing the manufacturing cost of the dishwasher.

In another embodiment, during the washing water heating phase of the dishwasher, the dishwasher determines whether the desorption process of the reversible dehydration adsorbent 9 is finished,

if so, controlling the circulating water pump 6 to be started, and communicating the three-way control valve 7 with the first pipeline 51 to enable the washing water to enter the heat exchanger 10 for heating;

if not, the circulating water pump 6 is controlled to be started, and the three-way control valve 7 is communicated with the third pipeline 53 to enable the washing water to enter the washing water heating device for heating. The phenomenon that the desorption of the reversible dehydration adsorbent 9 is not finished is prevented, washing water in the dish washing machine enters the heat exchanger 10 to be heated, the desorption of the reversible dehydration adsorbent 9 is influenced, the phenomenon that the desorption of the reversible dehydration adsorbent 9 is not finished when the dish washing machine enters a drying program to influence the drying of tableware is avoided, the whole washing time of the dish washing machine is prolonged, and the use experience of a user is influenced.

Further, in the washing water heating stage of the dishwasher, the desorption process of the reversible dehydration adsorbent 9 is finished, the dishwasher judges whether the temperature in the housing 8 detected by the temperature detecting means is greater than or equal to a preset temperature,

if so, controlling the circulating water pump 6 to be started, and communicating the three-way control valve 7 with the first pipeline 51 to enable the washing water to enter the heat exchanger 10 for heating;

if not, the circulating water pump 6 is controlled to be started, and the three-way control valve 7 is communicated with the third pipeline 53 to enable the washing water to enter the washing water heating device for heating. When the temperature in the shell 8 is not enough to heat the washing water, the dishwasher still controls the washing water to enter the heat exchanger 10 for heating, and the washing effect of the dishwasher is prevented from being influenced. When the residual heat of zeolite desorption is greater than or equal to the preset temperature, the control device of the dishwasher controls the three-way control valve 7 to be communicated with the first pipeline 51, the washing water is pumped into the heat exchanger 10 to be heated, the heat generated by zeolite desorption is utilized to heat, the washing water is not required to be heated by an extra heat source, and the energy consumption of the dishwasher is effectively reduced. When the residual heat of zeolite desorption is less than the preset temperature, the control device of the dishwasher controls the three-way valve to cut off the first pipeline 51 and connect the third pipeline 53, and the washing water is pumped into the heater 12 for heating. The washing effect of the dishwasher is not affected.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.