CN115607085A

CN115607085A - Dish washing machine with waste heat recovery function and control method

Info

Publication number: CN115607085A
Application number: CN202110784479.2A
Authority: CN
Inventors: 李涛; 潘永坤; 谢家钰
Original assignee: Chongqing Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd
Current assignee: Chongqing Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2023-01-17

Abstract

The invention discloses a dish washing machine with waste heat recovery, which comprises a liner, wherein the liner is provided with a water inlet and a water outlet, the water outlet of the liner is communicated with a water storage tank, and the bottom of the water storage tank is communicated with a water drainage pipeline of the dish washing machine; a heat exchange coil is arranged in the water storage tank, the water inlet end of the heat exchange coil is communicated with a water inlet pipeline of the dish washing machine, and the water outlet end of the heat exchange coil is communicated with the water inlet of the inner container. Through setting up storage water tank and heat exchange coil outside the inner bag, the outlet that makes the inner bag is linked together with the storage water tank, and the water inlet is linked together with heat exchange coil to make dish washer can produce the washing water heat transfer that high temperature waste water and rinsing step flowed into the inner bag to the main wash step, preheat the washing water of rinsing step, realized the heat reuse to high temperature waste water, promoted heat pump system's work efficiency.

Description

Dish washing machine with waste heat recovery function and control method

Technical Field

The invention belongs to the field of domestic appliances, and particularly relates to a dish washing machine with waste heat recovery and a control method of the dish washing machine with the waste heat recovery.

Background

The dish washer is used for automatically cleaning tableware such as dish, chopsticks, dish, knife and fork, and can be divided into two types of box type and conveying type according to the structure. It reduces the labor intensity for the cooking personnel in dining room, hotel and dining room of office, improves the working efficiency and promotes the cleanness and sanitation. At present, various small dishwashers are on the market, and are gradually entering ordinary households.

At present, the full-automatic dish washing machines on the market can be divided into two types of families and businesses, and the full-automatic dish washing machines for the families are only suitable for the dish washing machines for the families and mainly have cabinet type, desk type and water tank integrated types. The commercial dish washer can be divided into two types of box type and conveying type according to the structure, thereby reducing the labor intensity of the cooking personnel in restaurants, hotels and canteens of institutions, improving the working efficiency and promoting the cleanness and sanitation.

The dishwasher usually adopts an electric heating mode to improve the water temperature of the washing water, and the energy consumption is larger. In order to solve the above problems, some dish washing machines adopting other heating methods exist, for example, the application number is 201420465616.1, which is a Chinese utility model patent named as a heat pump type dish washing machine, the utility model provides a heat pump type dish washing machine, which comprises an inner container, a compressor, a condenser, a throttling device and an evaporator, wherein the condenser is arranged close to the outer wall of the inner container; the outlet of the compressor is connected with the inlet of the condenser, the outlet of the condenser is connected with the inlet of the evaporator through a throttling device, and the outlet of the evaporator is connected with the inlet of the compressor. The utility model discloses a having changed the mode that current dish washer adopted the heating pipe heating, having used heat pump system to the dish washer field, opened a brand-new heating and drying mode, very big reduction the consumption of the energy, and have better user experience.

The heat pump type dishwasher is a household appliance with low energy consumption and high efficiency, however, the above patent has the following disadvantages: the dish washer generally needs to carry out hot water washing process and hot water rinsing process, and the dish washer of the past is after the hot water washing, and the heat in the inner bag can the whitish loss, need follow the external heat absorption again when carrying out the hot water rinsing to heat the washing water, and the utilization ratio of heat energy is not high. The prior heat pump dish-washing machine technology does not relate to the recycling of the waste heat of hot water, so that the heat of the hot water after main washing is lost.

In addition, the existing heat pump type dish washer usually adopts a plurality of condensers to respectively heat washing water and drying air flow, so that the structure of the heat pump system is complex, and the cost of the dish washer is increased.

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

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a dish washing machine with waste heat recovery function, wherein the waste heat of high-temperature wastewater generated in a main washing step is recovered by using a water storage tank and a heat exchange coil, and washing water entering an inner container in a rinsing step is preheated by using the waste heat of the high-temperature wastewater, so that the waste heat in the inner container of the dish washing machine after the main washing step is fully utilized, and the heat utilization efficiency of a heat pump heating system is improved.

In order to solve the technical problems, the invention adopts the technical scheme that:

a dish washing machine with waste heat recovery function comprises a liner, wherein a water inlet and a water outlet are formed in the liner, the water outlet of the liner is communicated with a water storage tank, and the bottom of the water storage tank is communicated with a water drainage pipeline of the dish washing machine;

a heat exchange coil is arranged in the water storage tank, the water inlet end of the heat exchange coil is communicated with a water inlet pipeline of the dish washing machine, and the water outlet end of the heat exchange coil is communicated with the water inlet of the inner container.

Furthermore, the heat exchange coil is arranged in the water storage tank in a zigzag shape, and the water inlet end and the water outlet end of the heat exchange coil are respectively arranged on the side wall of the water storage tank.

Further, a water collecting tank is arranged at the bottom of the inner container, a water inlet is arranged at the top of the water collecting tank, and a water outlet is arranged at the bottom of the water collecting tank;

preferably, the water outlet is communicated with the water storage tank through a first one-way valve.

Further, a heating device is arranged in the water collecting tank and used for heating the washing water.

The drying device further comprises a drying channel, wherein the inner container is provided with an air outlet and an air inlet, the first end of the drying channel is connected with the air outlet, and the second end of the drying channel is connected with the air inlet;

preferably, the air inlet is arranged on the side wall of the inner container, the bottom of the inner container is provided with an air deflector, an air flow channel is formed between the air deflector and the inner wall of the inner container, and the air outlet is arranged at the top of the inner container and is arranged at the same side as the air inlet;

preferably, the air deflector is correspondingly arranged above the water collecting tank and has a gap with the bottom of the inner container, one end of the air deflector extends and is connected with the side wall at the top of the air inlet in a sealing manner, the other end of the air deflector extends towards the opposite side of the air inlet, at least covers the water collecting tank, and an opening is formed between the air deflector and the inner wall of the inner container.

Further, the heating device is a condenser, and the condenser is connected with the compressor, the throttle valve and the evaporator to form a refrigerant loop;

preferably, the evaporator includes a first evaporator and a second evaporator connected in parallel, the first evaporator is disposed in the drying passage, and the second evaporator is disposed outside the drying passage.

Further, the heat pump system further includes a switching device for selectively flowing refrigerant through the first evaporator and/or the second evaporator.

Further, the first evaporator and the second evaporator are connected into the refrigerant loop through a three-way reversing valve;

preferably, the three-way reversing valve is connected to the inlet ends of the first evaporator and the second evaporator.

It is still another object of the present invention to provide a method for controlling a dishwasher with waste heat recovery as set forth in any of the above, the dishwasher with waste heat recovery having a washing mode,

the cleaning mode comprises a main cleaning step and a rinsing step, and after the main cleaning step is finished, the high-temperature wastewater in the inner container is discharged into the water storage tank and exchanges heat with the washing water flowing into the inner container in the rinsing step.

Further, in the cleaning mode, the heat pump system is controlled to heat the washing water through the condenser, and the refrigerant flows through the second evaporator to exchange heat with the outside air;

and the drying mode is also provided, and in the drying mode, the heat pump system is controlled to heat the airflow through the condenser, and the refrigerant flows through the first evaporator to exchange heat with the airflow exhausted from the inner container.

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

1. According to the invention, the water storage tank and the heat exchange coil pipe are arranged outside the inner container, so that the water outlet of the inner container is communicated with the water storage tank, and the water inlet of the inner container is communicated with the heat exchange coil pipe, thus the dish-washing machine can exchange heat between high-temperature waste water generated in the main washing step and washing water flowing into the inner container in the rinsing step, preheat the washing water in the rinsing step, realize the reutilization of heat generated by the high-temperature waste water generated in the main washing step, and improve the working efficiency of a heat pump system.

2. The first evaporator and the second evaporator which are connected in parallel are arranged, and the first evaporator is arranged in the drying channel, so that the tableware can be dried in the dish washer in a closed manner, the condenser can continuously heat the circulating air, the first evaporator can dehumidify the circulating air, and the latent heat of vaporization of water vapor is recovered, so that the energy consumption can be saved, the drying time can be shortened, the tableware is prevented from being secondarily polluted, and the influence of the heat pump dish washer on the room temperature can be reduced.

3. In addition, in the drying stage, the refrigerant can flow through the first evaporator and the second evaporator at the same time, the refrigerant absorbs the heat of the drying air in the drying air pipeline and the heat of the outside air to evaporate, the refrigerant has two heat absorption sources, so that the energy carried by the refrigerant is improved, and when the refrigerant releases heat, more heat is released, so that the heating speed of the heat pump circulating system is higher, and the heating efficiency is higher.

4. The condenser is arranged at the bottom of the inner container, and the air guide plate extending towards the bottom of the inner container is arranged at the air inlet, so that the condenser can heat washing water in a cleaning mode and can heat air flow in a drying mode, the number of the condensers in a heat pump system is reduced, the structure of the heat pump system is simplified, and the cost of the dish-washing machine is reduced.

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 also be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic diagram of a dishwasher with waste heat recovery according to an embodiment of the present invention;

FIG. 2 is a schematic view of a dishwasher with waste heat recovery according to another embodiment of the present invention;

fig. 3 is a schematic view of the flow of the drying air stream in the embodiment of the present invention.

Description of the main elements in the figures:

101. a dishwasher housing; 102. an inner container; 1021. a water collection tank; 103. a water inlet pipeline; 104. a third check valve; 105. a drain line; 106. a heat exchange coil; 1061. a water inlet end; 1062. a water outlet end; 107. a spray arm; 108. a spray pump; 109. a spray nozzle; 110. a first check valve; 111. a water inlet; 112. a water discharge port; 113. an air inlet; 114. an air outlet; 115. a second check valve; 116. a water storage tank; 117. a fourth check valve; 200. a heat pump system; 201. a compressor; 202. a condenser; 203. a throttle valve; 204. a first evaporator; 205. a second evaporator; 206. a three-way reversing valve; 2061. a port a; 2062. b, opening; 2063. c, opening; 207. an external circulation fan; 208. a fan inlet; 209. an exhaust fan; 210. an air deflector; 211. a drying channel; 212. an air flow channel.

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 relational terms such as "first", "second", and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

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 and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 to 3, in the embodiment of the present invention, a dishwasher with waste heat recovery is described, which includes a dishwasher housing 101, an inner container 102 is disposed in the dishwasher housing 101, a cavity is disposed in the inner container 102, and dishes to be washed, such as dishes and bowls, are placed in the cavity of the inner container 102. It will be appreciated that a rack or the like for supporting dishes may be provided within the cavity.

The cavity of the inner container 102 is also provided with a spray arm 107 corresponding to the rack for supporting the dishes, and in the washing mode or the washing stage of the dishwasher, the spray arm 107 sprays the washing water onto the dishes in the cavity to achieve the purpose of washing the dishes. The spray arm 107 is at least one mounting arm and a plurality of spray nozzles 109 fixed on the mounting arm, and the spray power of the spray nozzles 109 is provided by a spray pump 108.

In this embodiment, the bottom of the inner container 102 is provided with a water collecting tank 1021, one side of the water collecting tank 1021 is provided with an opening for communicating with the spray nozzle 109, the water collecting tank 1021 is sequentially communicated with the spray pump 108 and the spray nozzle 109 through a pipeline, the washing water in the water collecting tank 1021 is transmitted to the spray nozzle 109 under the action of the spray pump 108 for spraying, and the sprayed washing water returns to the water collecting tank 1021 again, so that the washing water circularly flows through the spray pump 108 to achieve the purpose of washing tableware.

The invention heats the washing water through the heating system in order to improve the cleaning effect of the dish-washing machine. The heating system includes a heat pump system 200.

The heat pump system 200 includes a compressor 201, a condenser 202, a throttle valve 203 and an evaporator which are connected to each other to form a refrigerant circuit, wherein the condenser 202 is installed in a water collecting tank 1021 for heating washing water, and spraying dishes after the washing water is heated by the condenser 202, so that the dishwasher has a good washing effect and high efficiency.

A water storage tank 116 is installed on the outer side of the inner container 102, and a heat exchange coil 106 penetrating through the water storage tank 116 is arranged in the water storage tank 116, so as to exchange heat between the medium in the water storage tank 116 and the medium in the heat exchange coil 106. Preferably, the heat exchanging coil 106 is disposed in the water storage tank 116 in a zigzag shape to increase a path and a contact area of the medium in the heat exchanging coil 106 flowing through the water storage tank 116, so as to increase a heat exchanging efficiency between the medium in the heat exchanging coil 106 and the medium in the water storage tank 116, and the water inlet end 1061 and the water outlet end 1062 of the heat exchanging coil 106 are respectively disposed on the sidewall of the water storage tank 116.

The inner container 102 is provided with a water inlet 111 and a water outlet 112, in this embodiment, the water outlet 112 of the inner container 102 is communicated with a water storage tank 116 through a first one-way valve 110, and the bottom of the water storage tank 116 is communicated with a water discharge pipeline 105 of the dishwasher through a second one-way valve 115; the water inlet end 1061 of the heat exchange coil 106 is communicated with the water inlet pipeline 103, and the water outlet end 1062 of the heat exchange coil 106 is communicated with the water inlet 111 of the inner container 102. The high-temperature waste water in the inner container 102 is discharged into the water storage tank 116 and stored in the water storage tank, and exchanges heat with the washing water flowing into the inner container 102 from the heat exchange coil 106 again, so that the new flowing washing water can be preheated, the waste heat is fully utilized, and the utilization rate of heat energy is improved.

Example one

As shown in fig. 1, the present embodiment discloses a dishwasher with waste heat recovery, which includes an inner container 102, and a water collecting tank 1021 is disposed at the bottom of the inner container 102. The inner container 102 is internally provided with a spray arm 107, the spray arm 107 sprays the washing water in the water collecting tank 1021 pumped by the spray pump 108, and the sprayed washing water returns to the water collecting tank 1021 again, so that the washing water circularly flows through the spray pump 108 to achieve the purpose of washing tableware.

As shown in fig. 1, the heat pump system 200 includes a compressor 201, a condenser 202, a throttle 203 and an evaporator connected to each other to form a heat pump working medium circuit, and the heat pump system 200 operates on the principle of transferring energy by converting the gas-liquid state of the heat pump working medium, specifically, high-pressure refrigerant vapor discharged from the compressor 201 flows into the condenser 202, the refrigerant vapor condenses to release latent heat, the condensed liquid refrigerant flows through the throttle 203 and enters the evaporator, the evaporator absorbs external heat to evaporate, and the evaporated vapor is sucked into the compressor 201 to complete a heating cycle.

The present invention heats the washing water using the latent heat released from the condenser 202. The condenser 202 of the present invention is installed in the water collecting tank 1021 for heating the washing water, and the washing water is heated by the condenser 202 and then sprayed to the dishes, so that the dishwasher has good cleaning effect and high efficiency.

In this embodiment, the inner container 102 is provided with a water inlet 111 and a water outlet 112, a water storage tank 116 is installed below the inner container 102, and a heat exchange coil 106 penetrating through the water storage tank 116 is disposed in the water storage tank 116, so as to exchange heat between a medium in the water storage tank 116 and a medium in the heat exchange coil 106. Preferably, the heat exchanging coil 106 is disposed in the water storage tank 116 in a zigzag shape to increase a path and a contact area of the medium in the heat exchanging coil 106 flowing through the water storage tank 116, so as to increase a heat exchanging efficiency between the medium in the heat exchanging coil 106 and the medium in the water storage tank 116, and the water inlet end 1061 and the water outlet end 1062 of the heat exchanging coil 106 are respectively disposed on the sidewall of the water storage tank 116.

Preferably, in this embodiment, the end of the water inlet pipe 103 far from the water storage tank 116 extends out of the dishwasher housing 101 and is communicated with the tap water pipe through the third one-way valve 104, and the addition or stop of the addition of the washing water is realized by opening or closing the third one-way valve 104. Still be provided with the drain pipe 105 of intercommunication storage water tank 116 in the dishwasher casing 101, the one end that the storage water tank 116 was kept away from to drain pipe 105 stretches out dishwasher casing 101 outside and extends, and second check valve 115 is installed at drain pipe 105 tip, and the waste water through the control storage water tank 116 of switching second check valve 115 is discharged.

Example two

The difference between this embodiment and the third embodiment is that, as shown in fig. 2, in this embodiment, an outlet end of the spray pump 108 is connected to the water inlet pipe 103 between the third check valve 104 and the water inlet end 1061 of the heat exchange coil 106 through a pipe, a fourth check valve 117 is disposed on the connected pipe, and by opening the fourth check valve 117, the washing water in the water collection tank 1021 circulates into the water inlet pipe 103 and the heat exchange coil 106 under the action of the spray pump 108, so that multiple heat exchanges are performed between the washing water and the high-temperature wastewater in the water storage tank 116, and after the temperature of the washing water in the water collection tank 1021 is higher than that of the wastewater in the water storage tank 116, the fourth check valve 117 is closed.

EXAMPLE III

As shown in fig. 1 to 3, in the embodiment of the present invention, a dishwasher with waste heat recovery is described, which includes an inner container 102, and a water collecting groove 1021 is provided at the bottom of the inner container 102. The inner container 102 is internally provided with a spray arm 107, the spray arm 107 sprays the washing water in the water collecting tank 1021 pumped by the spray pump 108, and the sprayed washing water returns to the water collecting tank 1021 again, so that the washing water circularly flows through the spray pump 108 to achieve the purpose of washing tableware.

The present invention heats the washing water using the latent heat released from the condenser 202. The condenser 202 of the present invention is installed in the water collecting tank 1021 for heating the washing water, and the washing water is heated by the condenser 202 and then sprayed to the tableware, so that the washing effect of the dish washer is good and the efficiency is high.

Preferably, in this embodiment, a drying system is further disposed in the dishwasher, and the drying system includes a drying channel 211 for delivering drying air into the inner container 102.

In this embodiment, the drying channel 211 is disposed between the dishwasher housing 101 and the inner container 102; an air outlet 114 and an air inlet 113 are formed in the inner container 102, a first end of the drying channel 211 is communicated with the air outlet 114, and a second end of the drying channel 211 is communicated with the air inlet 113; an exhaust fan 209 is installed on the dishwasher housing 101 corresponding to the air outlet 114 for sucking the air flow in the inner container 102 into the drying channel 211, and an air inlet fan 208 is installed on the dishwasher housing 101 corresponding to the air inlet 113 for blowing the air flow in the drying channel 211 into the inner container 102, so that the air flow circulates between the drying channel 211 and the inner container 102, thereby drying the tableware in the inner container 102.

Preferably, in this embodiment, the air inlet 113 is disposed on the side wall of the inner container 102, the air deflector 210 is mounted at the bottom of the inner container 102, an air flow channel 212 is formed between the air deflector 210 and the inner wall of the inner container 102, and the air outlet 114 is disposed at the top of the inner container 102 and on the same side as the air inlet 113; the air deflector 210 is correspondingly installed above the water collection tank 1021, and a gap is left between the air deflector 210 and the bottom of the liner 102, one end of the air deflector 210 extends and is connected with the side wall of the top of the air inlet 113 in a sealing manner, the other end of the air deflector extends to the opposite side of the air inlet 113, the air deflector at least covers the water collection tank 1021, and an opening for air to flow out is left between the air deflector and the inner wall of the liner 102. Such that the condenser 202 within the sump 1021 is within the airflow channel 212 for heating the airflow passing through the airflow channel 212. After entering the inner container 102 from the air inlet 113, the air exchanges heat with the condenser 202 at the bottom of the inner container 102 to form high-temperature air, and then the high-temperature air acts on the tableware inside the inner container 102, so that the inside of the inner container 102 and the tableware inside the inner container 102 are dried. The air outlet 114 of the inner container 102 is disposed at the top of the inner container 102 and at the same side as the air inlet 113 of the inner container 102, so that the air flow entering the inner container 102 for drying is fully contacted with the inner wall of the inner container 102 and the tableware, thereby enhancing the drying effect.

The present invention uses the same condenser 202 to heat the washing water in the washing mode and the air flow in the drying mode, thereby reducing the number of the condensers 202 in the heat pump system 200, further simplifying the structure of the heat pump system 200 and reducing the cost of the dishwasher.

As shown in fig. 1, in the present embodiment, the evaporator includes a first evaporator 204 and a second evaporator 205, the first evaporator 204 and the second evaporator 205 are connected in parallel with each other and are connected into the refrigerant circuit, and a portion where refrigerant inlet ends of the first evaporator 204 and the second evaporator 205 are connected with the refrigerant circuit is provided with a switching device, and under the action of the switching device, the refrigerant in the refrigeration circuit selectively flows through the first evaporator 204 and/or the second evaporator 205.

Preferably, in this embodiment, the switching device is a three-way reversing valve 206, the three-way reversing valve 206 includes three openings a, b, and c, which are communicable with each other, wherein the port a 2061 of the three-way reversing valve 206 is communicated with the outlet end of the condenser 202, the port b 2062 of the three-way reversing valve 206 is communicated with the inlet end of the first evaporator 204, and the port c 2063 of the three-way reversing valve 206 is communicated with the inlet end of the second evaporator 205, so that the refrigerant is controlled to flow into the first evaporator 204, into the second evaporator 205, or into both the first evaporator 204 and the second evaporator 205 by controlling the port a 2061 of the three-way reversing valve 206 to be communicated with the port b 2062, or with the port c 2063, or to be communicated with the ports b 2062 and c 2063.

Preferably, in this embodiment, a throttle valve 203 for controlling the flow rate is further disposed between the three-way reversing valve 206 and the condenser 202.

Preferably, in this embodiment, the outlet ends of the first evaporator 204 and the second evaporator 205 are communicated with each other and with the inlet end of the compressor 201, and the outlet end of the compressor 201 is communicated with the inlet end of the condenser 202, so as to provide power for the refrigerant flowing in the refrigerant circuit by the operation of the compressor 201.

In this embodiment, the first evaporator 204 is disposed in the drying channel 211, and is used for exchanging heat with the airflow in the drying channel 211 in the drying mode: in the drying mode, the heat pump system 200 and the drying system are turned on, the drying system continuously provides the drying air flow, the refrigerant in the first evaporator 204 absorbs the temperature of the drying air flow to evaporate, and meanwhile, the water vapor taken out from the liner 102 by the air flow is condensed on the shell of the first evaporator 204, so that the drying air flow is dehumidified and is in a dry and cold state.

In this embodiment, the second evaporator 205 is disposed outside the drying passage 211 for exchanging heat with the outside air. The second evaporator 205 may be disposed inside the dishwasher housing 101 or may be separately installed by a separate housing installation and communicated with the refrigerant circuit inside the dishwasher housing 101 through a pipe.

Preferably, in this embodiment, the inside of the dishwasher housing 101 is provided with a channel for separately accommodating the second evaporator 205, the channel is open at two ends, and the inside of the channel is provided with an external circulation fan 207 for accelerating the airflow in the channel, so as to enhance the heat exchange efficiency between the second evaporator 205 and the external airflow.

Preferably, in this embodiment, the dishwasher controls the heat pump system 200 to heat the washing water through the condenser 202 in the washing mode, the port a 2061 of the three-way selector valve 206 is connected to only the port c 2063, and the refrigerant flows through the second evaporator 205 to exchange heat with the outside air.

After the cleaning stage is finished, the drying stage is started, the port 2061 of the three-way reversing valve 206a is communicated with the port b 2062 only, the refrigerant flows through the first evaporator 204 to exchange heat with the air flow in the drying channel 211, the refrigerant absorbs the temperature of the drying air flow to evaporate, the energy absorbed by the refrigerant is higher, and meanwhile, the drying air flow can be dehumidified in the condensation process.

Further, in the drying mode, the port a 2061 of the three-way reversing valve 206 may be simultaneously communicated with the port b 2062 and the port c 2063, so that the first evaporator 204 and the second evaporator 205 are both communicated with the refrigerant circuit, and the refrigerant flowing through the first evaporator 204 and the second evaporator 205 enters the compressor 201 after being mixed at the outlet end. By arranging the first evaporator 204 and the second evaporator 205, in the drying stage, the refrigerant in the first evaporator 204 absorbs the temperature of the drying airflow to evaporate, and simultaneously the humidity of the drying airflow is reduced, so that the drying airflow is in a dry and cold state; the refrigerant in the second evaporator 205 absorbs the heat of the outside air to further raise the temperature of the refrigerant, and the two evaporators fully utilize the heat of the drying air and the outside air to make the energy absorbed by the refrigerant higher, so that the temperature of the refrigerant after passing through the evaporation device is higher, and the refrigerant can emit more heat when passing through the condenser 202, thereby improving the heating efficiency of the condenser 202 on the drying air flow.

Example four

The present embodiment is an explanation of a control method of a dishwasher with waste heat recovery of the above-described embodiment.

In this embodiment, the dishwasher includes a pre-wash mode, a main wash mode, a rinse mode, and a dry mode during use.

Pre-washing and main washing modes: firstly, the third one-way valve 104 is opened, and a certain amount of tap water flows into the inner container 102 through the water inlet pipeline 103; the spray pump 108 then pumps the washing water in the tub 102 to spray the spray arm 107. The heat is absorbed by the condenser 202 under the suction of the spray pump 108, sprayed onto the dishes by the spray arm 107, and then returned to the bottom of the tub 102 for a reciprocating cycle.

The port a 2061 of the three-way reversing valve 206 is communicated with the port c 2063, the heat pump system 200 is started, and the refrigerant flows out from the outlet end of the compressor 201, sequentially flows through the condenser 202, the throttle valve 203 and the second evaporator 205, and finally returns to the inlet end of the compressor 201 for circulation. In the process, the refrigerant flows through the second evaporator 205, but does not flow through the first evaporator 204, absorbs heat from the ambient air, then enters the compressor 201, the condenser 202, transfers heat to hot water in the condenser 202, then enters the throttle valve 203, and finally returns to the second evaporator 205. The external circulation fan 207 is activated to circulate the air flow around the second evaporator 205, ensuring that the second evaporator 205 can absorb sufficient heat from the air.

After the main washing mode is finished, the spraying pump 108 stops operating, the temperature of the waste water retained in the liner 102 is higher, the first check valve 110 is opened to discharge the high-temperature waste water in the liner 102 and store the high-temperature waste water in the water storage tank 116 for standby, and the first check valve 110 is closed after the discharge is finished.

Rinsing mode: the third check valve 104 is opened again to refill the tub 102 with the washing water. At this time, the washing water flows in from the water inlet pipeline 103, and when flowing through the heat exchange coil 106, the washing water exchanges heat with the high-temperature wastewater in the water storage tank 116, so as to preheat the newly added washing water, and after entering the inner container 102, the preheated washing water absorbs heat from the condenser 202, thereby achieving the purpose of waste heat recycling, realizing the recycling of the heat of the high-temperature wastewater generated in the main washing step, and improving the working efficiency of the heat pump system 200.

After the rinsing is finished, the second check valve 115 is opened to discharge the low-temperature wastewater in the water storage tank 116 through the drainage pipeline 105, and the high-temperature wastewater generated by the rinsing is stored in the water storage tank 116 again for standby.

Drying mode: the three-way reversing valve 206 is adjusted to communicate the port a 2061 with the port b 2062 of the three-way reversing valve 206, the heat pump system 200 is started, and the refrigerant flows out from the outlet end of the compressor 201, sequentially flows through the condenser 202, the throttle valve 203 and the first evaporator 204, and finally returns to the inlet end of the compressor 201 for circulation. The drying system is started and the drying system is started,

the air flow forms a closed cycle under the driving of the exhaust fan 209 and the intake fan 208: the air intake fan 208 guides the airflow to the condenser 202 through the air deflector 210 to take heat, then the airflow passes through the surface of the tableware to evaporate moisture, and becomes humid air with higher humidity, the humid air enters the first evaporator 204 under the suction action of the exhaust fan 209, and is absorbed by the first evaporator 204, the water vapor is condensed into condensed water, the humidity of the airflow is reduced, so that the drying airflow is in a dry and cold state, then the airflow returns to the condenser 202 to absorb heat, and the circulation is repeated until the tableware is dried.

EXAMPLE five

The difference between this embodiment and the third embodiment is that in this embodiment, when the dishwasher is in the drying mode, the port a 2061 of the three-way reversing valve 206 is communicated with the port b 2062 and the port c 2063 at the same time, so that the first evaporator 204 and the second evaporator 205 are both communicated with the refrigerant circuit, and the refrigerant flowing through the first evaporator 204 and the second evaporator 205 enters the compressor 201 after being mixed at the outlet end. By arranging the first evaporator 204 and the second evaporator 205, in the drying stage, the refrigerant in the first evaporator 204 absorbs the temperature of the drying airflow to evaporate, and simultaneously the humidity of the drying airflow is reduced, so that the drying airflow is in a dry and cold state; the refrigerant in the second evaporator 205 absorbs heat of the outside air, and after the refrigerant flowing out of the first evaporator 204 is mixed, the temperature of the refrigerant is further increased, and by using the two evaporators, the heat of the drying air and the heat of the outside air are fully utilized, so that the energy absorbed by the refrigerant is higher, and the temperature of the refrigerant after passing through the evaporation device is higher, so that the refrigerant can emit more heat when passing through the condenser 202, thereby improving the heating efficiency of the condenser 202 on the drying air flow.

Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.

Claims

1. A dishwasher with waste heat recovery comprises a liner (102), wherein the liner (102) is provided with a water inlet (111) and a water outlet (112), and is characterized in that the water outlet (112) of the liner (102) is communicated with a water storage tank (116), and the bottom of the water storage tank (116) is communicated with a water discharge pipeline (105) of the dishwasher;

a heat exchange coil (106) is arranged in the water storage tank (116), a water inlet end (1061) of the heat exchange coil (106) is communicated with a water inlet pipeline (103) of the dish washing machine, and a water outlet end (1062) of the heat exchange coil (106) is communicated with a water inlet (111) of the liner (102).

2. The dishwasher with waste heat recovery according to claim 1, characterized in that the heat exchanging coil (106) is arranged in a zigzag shape in the water storage tank (116), and the water inlet end (1061) and the water outlet end (1062) of the heat exchanging coil (106) are respectively arranged on the side wall of the water storage tank (116).

3. The dishwasher with waste heat recovery according to claim 1 or 2, characterized in that the bottom of the inner container (102) is provided with a water collecting tank (1021), the top of the water collecting tank (1021) is provided with a water inlet (111), and the bottom of the water collecting tank (1021) is provided with a water outlet (112);

preferably, the drain (112) is in communication with the storage tank (116) through a first one-way valve (110).

4. The dishwasher with waste heat recovery according to claim 3, wherein a heating means is provided in the sump (1021) for heating the washing water.

5. The dishwasher with the function of waste heat recovery according to claim 4, further comprising a drying channel (211), wherein the inner container (102) is provided with an air outlet (114) and an air inlet (113), a first end of the drying channel (211) is connected with the air outlet (114), and a second end is connected with the air inlet (113);

preferably, the air inlet (113) is arranged on the side wall of the liner (102), the air deflector (210) is arranged at the bottom of the liner (102), an air flow channel (212) is formed between the air deflector (210) and the inner wall of the liner (102), and the air outlet (114) is arranged at the top of the liner (102) and is on the same side as the air inlet (113);

preferably, the air deflector (210) is correspondingly arranged above the water collecting tank (1021) and a gap is reserved between the air deflector and the bottom of the inner container (102), one end of the air deflector (210) extends and is connected with the side wall of the top of the air inlet (113) in a sealing mode, the other end of the air deflector extends towards the opposite side of the air inlet (113), the air deflector at least covers the water collecting tank (1021), and an opening is reserved between the air deflector and the inner wall of the inner container (102).

6. Dishwasher with waste heat recovery according to claim 4 or 5, characterized in that the heating device is a condenser (202), the condenser (202) being interconnected with the compressor (201), the throttle valve (203) and the evaporator to form a refrigerant circuit;

preferably, the evaporator comprises a first evaporator (204) and a second evaporator (205) which are connected in parallel, the first evaporator (204) is arranged in the drying channel (211), and the second evaporator (205) is arranged outside the drying channel (211).

7. Dishwasher with waste heat recovery according to claim 6, characterized in that the heat pump system (200) further comprises a switching device for selectively flowing refrigerant through the first evaporator (204) and/or the second evaporator (205).

8. The dishwasher with waste heat recovery according to claim 7, characterized in that the first evaporator (204) and the second evaporator (205) are connected into the refrigerant circuit by a three-way reversing valve (206);

preferably, the three-way reversing valve (206) is connected to the inlet ends of the first evaporator (204) and the second evaporator (205).

9. A control method of a dishwasher with waste heat recovery having a washing mode according to any one of claims 1 to 8,

the cleaning mode comprises a main cleaning step and a rinsing step, and after the main cleaning step is finished, high-temperature wastewater in the inner container (102) is discharged into the water storage tank (116) and exchanges heat with washing water flowing into the inner container (102) in the rinsing step.

10. The control method of a dishwasher with waste heat recovery as set forth in claim 9,

in a washing mode, controlling the heat pump system (200) to heat washing water through the condenser (202), and the refrigerant flowing through the second evaporator (205) to exchange heat with outside air;

there is also a drying mode in which the heat pump system (200) is controlled to heat the airflow by the condenser (202) and a refrigerant flows through the first evaporator (204) in heat exchange relationship with the airflow exhausted from the liner (102).