Heat pump dish washing machine and control method thereof

Abstract

The invention discloses a heat pump dish-washing machine and a control method thereof.The heat pump dish-washing machine comprises a dish-washing cavity, a water supply pipeline, a heat pump system, a heat exchange chamber, a first air duct and a second air duct, the dish-washing cavity communicates with the heat exchange chamber through the first air duct and the second air duct, and a fan is arranged in the heat exchange chamber; the fan can supply air from the first air duct to the second air duct; the heat pump system comprises a compressor, a condenser, an evaporator, a heat exchanger, a first throttling element and a second throttling element, the water supply pipeline can supply water into the dish washing cavity, and water of the water supply pipeline flows through the condenser and exchanges heat with the condenser; the evaporator and the heat exchanger are located in the heat exchange chamber, and the evaporator is closer to the first air duct relative to the heat exchanger. The energy efficiency and the drying effect can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dishwashers, and more specifically, it relates to a heat pump dishwasher and also relates to a control method for a heat pump dishwasher. Background Art

[0002] With the improvement of living standards, dishwashers have developed rapidly and have entered more and more families. However, most traditional dishwashers use electric heating tubes to heat the washing liquid, resulting in relatively high energy consumption. With the development of the market, the requirement for energy efficiency of dishwashers is increasing day by day, and reducing energy consumption is the future development trend. Moreover, after the dishwasher finishes washing, it is necessary to dry the tableware in its inner container. Most of the existing drying methods are technologies such as automatic door opening drying, zeolite drying, and blower drying, and the drying effect needs to be improved. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems and provide a heat pump dishwasher that can improve the drying effect.

[0004] The above technical objective of the present invention is achieved through the following technical solutions: A heat pump dishwasher includes a washing chamber, a water supply pipeline, a heat pump system, a heat exchange chamber, a first air duct, and a second air duct. The washing chamber is connected to the heat exchange chamber through the first air duct and the second air duct. A blower is arranged in the heat exchange chamber, and the blower can blow air from the first air duct towards the second air duct.

[0005] The heat pump system includes a compressor, a condenser, an evaporator, and a heat exchanger. The water supply pipeline can supply water into the washing chamber, and the water flow in the water supply pipeline passes through the condenser and exchanges heat with the condenser. The evaporator and the heat exchanger are located in the heat exchange chamber, and the evaporator is closer to the first air duct than the heat exchanger.

[0006] The condenser includes a first condenser port and a second condenser port, and the heat exchanger includes a first heat exchanger port and a second heat exchanger port. The first heat exchanger port can be connected to the outlet of the compressor, the second heat exchanger port is connected to the evaporator, the first condenser port can be connected to the outlet of the compressor, and the second condenser port can be connected to the first heat exchanger port.

[0007] The present invention also provides a control method for a heat pump dishwasher. The above heat pump dishwasher includes a washing stage and a drying stage. During the washing stage, the condenser dissipates heat outward, and the heat exchanger and the evaporator absorb heat outward. The water supply pipeline supplies water into the washing chamber, and the water flow in the water supply pipeline passes through the condenser and exchanges heat with the condenser. The air in the heat exchange chamber passes through the heat exchanger and the evaporator and absorbs heat outward.

[0008] During the drying stage, the heat exchanger dissipates heat outward, and the evaporator absorbs heat outward; the air in the heat exchange chamber and the air in the dishwashing chamber circulate, and the air first flows through the evaporator for condensation and then through the heat exchanger for heating to circulate and dry the dishwashing chamber.

[0009] In this solution, a heat pump system is adopted to provide heat for heating the washing water, which has higher energy efficiency than the previous electric heating method. The heating in the washing stage and the drying stage share the same heat pump system, which can reduce the size of the heat pump system and improve the energy efficiency of the dishwasher. At the same time, the heat exchanger in the heat pump system can switch between the functions of heat dissipation and heat absorption, improving the heat exchange efficiency of the heat pump system and the energy efficiency. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of the heat pump dishwasher in this embodiment;

[0011] Figure 2 It is a schematic structural diagram of the heat pump system and the drying air duct in this embodiment.

[0012] Reference numerals: 1, dishwashing chamber; 2, water supply pipeline; 3, heat exchange chamber; 31, first air duct; 32, second air duct; 33, first air damper; 331, first port of the first air damper; 332, second port of the first air damper; 333, third port of the first air damper; 34, second air damper; 341, first port of the second air damper; 342, second port of the second air damper; 343, third port of the second air damper; 4, fan; 5, compressor; 6, condenser; 61, first port of the condenser; 62, second port of the condenser; 7, heat exchanger; 71, first port of the heat exchanger; 72, second port of the heat exchanger; 8, evaporator; 9, three-way valve; 91, first port of the three-way valve; 92, second port of the three-way valve; 93, third port of the three-way valve; 10, throttling element one; 11, throttling element two. Detailed Embodiments

[0013] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0014] This embodiment discloses a heat pump dishwasher. Refer to Figure 1As shown in the figure, it includes a dishwashing cavity 1, a water supply pipeline 2, a heat pump system, a heat exchange chamber 3, a first air duct 31 and a second air duct 32; when the dishwasher is working, it has a washing stage and a drying stage. During the washing stage, the water supply pipeline 2 can supply water into the dishwashing cavity 1, and then spray and wash the items in the dishwashing cavity 1. The heat pump system can heat the water in the water circuit system; during the drying stage, the heat pump system can introduce circulating air into the dishwashing cavity 1 and play a drying effect by means of the heat generated by the heat pump system. This heat pump dishwasher also has components such as a water cup, a water inlet pipe, a drain pipe and a sprayer, which can wash the tableware in the dishwashing cavity 1 during the washing stage.

[0015] The heat pump system includes a condenser 6, an evaporator 8 and a heat exchanger 7. The condenser 6 is a water-cooled condenser 6 that can dissipate heat to the outside. The water supply pipeline 2 supplies water into the dishwashing cavity 1, and the water flow in the water supply pipeline 2 passes through the condenser 6 and exchanges heat with the condenser 6 to heat the water in the water supply pipeline 2.

[0016] The heat exchanger 7 is an air-cooled heat exchanger 7. During the washing stage, it can absorb heat from the outside and act as the evaporator 8. The heat exchanger 7 cooperates with the evaporator 8 to improve the heat exchange efficiency on the evaporator 8 side; during the drying stage, it can dissipate heat to the outside and act as the condenser 6, and can be used as the heat source in the drying stage to realize two functions of heating the washing water and heat pump drying with a set of heat pump system.

[0017] The dishwashing cavity 1 is connected to the heat exchange chamber 3 through the first air duct 31 and the second air duct 32. A fan 4 is installed in the heat exchange chamber 3. When the fan 4 is working, it can send air from the first air duct 31 to the second air duct 32, and then an air circulation can be formed between the dishwashing cavity 1 and the heat exchange chamber 3. The evaporator 8 and the heat exchanger 7 are both installed in the heat exchange chamber 3, and the evaporator 8 is closer to the first air duct 31 than the heat exchanger 7. When the air circulates, the air in the dishwashing cavity 1 enters the heat exchange chamber 3 from the first air duct 31, first flows through the evaporator 8, then passes through the heat exchanger 7, and then enters the dishwashing cavity 1 from the second air duct 32 to realize the circulating drying of the dishwashing cavity 1.

[0018] The heat pump dishwasher also includes a first air damper 33 and a second air damper 34, and the heat exchange chamber 3 and the two air ducts are connected through the two air dampers. Among them, the first air damper 33 includes a first air damper first port 331, a first air damper second port 332 and a first air damper third port 333. The first air damper first port 331 is connected to the heat exchange chamber 3, the first air damper second port 332 is connected to the first air duct, and the third end of the first air damper 33 communicates with the outside environment. The first air damper 33 can realize switching control and can control the first air damper first port 331 to communicate with the first air damper second port 332, or the first air damper first port 331 to communicate with the first air damper third port 333.

[0019] The second air damper 34 includes a first port 341 of the second air damper, a second port 342 of the second air damper, and a third port 343 of the second air damper. The first port 341 of the second air damper is connected to the heat exchange chamber 3, the second port 342 of the second air damper is connected to the second air duct, and the third end of the second air damper 34 communicates with the external environment. The second air damper 34 can achieve switching control, and can control the first port 341 of the second air damper to communicate with the second port 342 of the second air damper, or the first port 341 of the second air damper to communicate with the third port 343 of the second air damper.

[0020] By controlling the first air damper 33 and the second air damper 34, two different air flow paths can be formed during the washing stage and the drying stage of the dishwasher.

[0021] During the washing stage, the first port 331 of the first air damper communicates with the third port 333 of the first air damper, and the first port 341 of the second air damper communicates with the third port 343 of the second air damper, that is, both sides of the heat exchange chamber 3 communicate with the external environment. Through the blower 4 to supply air, the outside air can flow through the heat exchange chamber 3, and heat exchange between the evaporator 8, the heat exchanger 7 and the external environment can be realized.

[0022] During the washing stage, the first port 331 of the first air damper communicates with the second port 332 of the first air damper, and the first port 341 of the second air damper communicates with the second port 342 of the second air damper, that is, the heat exchange chamber 3 can communicate with the first air duct 31 and the second air duct 32 on both sides. Through the blower 4 to supply air, the air can circulate between the heat exchange chamber 3 and the dishwashing cavity 1, and the dishwashing cavity 1 can be dried.

[0023] Refer to Figure 2 As shown, the heat pump system further includes a compressor 5, a first throttling element 10, and a second throttling element 11. The condenser 6 includes a first port 61 of the condenser and a second port 62 of the condenser. The heat exchanger 7 includes a first port 71 of the heat exchanger and a second port 72 of the heat exchanger; the first port 71 of the heat exchanger can communicate with the outlet of the compressor 5, the second port 72 of the heat exchanger communicates with the evaporator 8, the first port 61 of the condenser can communicate with the outlet of the compressor 5, and the second port 62 of the condenser can communicate with the first port 71 of the heat exchanger.

[0024] The connection between the compressor 5, the condenser 6, and the heat exchanger 7 is achieved through a three-way valve. Two flows are formed at the outlet of the compressor 5. Through the control of the three-way valve, the condenser 6 and the heat exchanger 7 can be switched under different working conditions.

[0025] The three-way valve includes a first port 91 of the three-way valve, a second port 92 of the three-way valve, and a third port 93 of the three-way valve. The first port 91 of the three-way valve is connected to the outlet of the compressor 5, the second port 92 of the three-way valve is connected to the first port 61 of the condenser, and the third port 93 of the three-way valve is connected to the first port 71 of the heat exchanger.

[0026] The throttling element 10 is installed at the second port 72 of the heat exchanger, and the throttling element 11 is installed at the second port 62 of the condenser. Both the throttling element 10 and the throttling element 10 adopt electronic expansion valves. Through the two throttling elements, the throttling state can be switched at different stages, and then the function of the heat exchanger 7 can be switched.

[0027] In this embodiment, during the operation of the heat pump dishwasher, there are roughly two stages, namely the washing stage and the drying stage.

[0028] During the washing stage, the three-way valve controls the connection between the first port 91 and the second port 92 of the three-way valve, and the third port 93 of the three-way valve is closed; the throttling element 10 is switched to the fully open state, and the throttling element 11 serves as the throttling device of the heat pump system. The refrigerant output by the compressor 5 flows through the condenser 6, the heat exchanger 7, and the evaporator 8 in sequence, and the heat exchanger 7 and the evaporator 8 absorb heat from the outside together.

[0029] The first air damper 33 and the second air damper 34 are switched. The first air damper 33 controls the connection between the first port 331 and the third port of the first air outlet of the first air damper, and the second port 332 of the first air damper is closed; the second air damper 34 controls the connection between the first port 341 and the third port of the second air outlet of the second air damper, and the second port 342 of the second air damper is closed; the heat exchange chamber 3 is disconnected from the first air duct 31 and the second air duct 32 and is connected to the external environment. Inside the heat exchange chamber 3, the fan 4 blows air, and the air flows through the heat exchange chamber 3. The heat exchanger 7 and the evaporator 8 absorb heat from the outside together, which can improve the heat exchange efficiency of the heat pump system and further improve the heating energy efficiency of the heat pump system during the washing stage.

[0030] During the drying stage, the three-way valve controls the connection between the first port 91 and the third port 93 of the three-way valve, and the second port 92 of the three-way valve is closed; the throttling element 10 serves as the throttling device of the heat pump system, and the throttling element 11 is switched to the fully closed state to disconnect the condenser 6 from the refrigerant flow path in the heat pump system. The refrigerant output by the compressor flows through the heat exchanger 7 and the evaporator 8 in sequence, the heat exchanger 7 dissipates heat to the outside, and the evaporator 8 absorbs heat from the outside.

[0031] The first air damper 33 and the second air damper 34 are switched to control the connection between the first port 331 of the first air damper and the second port of the first air outlet, and the third port 333 of the first air damper is closed; control the connection between the first port 341 of the second air damper and the second port of the second air outlet, and the third port 343 of the second air damper is closed; the heat exchange chamber 3 is disconnected from the external environment and connected to the first air duct 31 and the second air duct 32. The fan 4 supplies air, and the air forms a cycle between the heat exchange chamber 3 and the dishwashing cavity 1. The humid air in the dishwashing cavity 1 first passes through the evaporator 8, contacts the surface of the relatively low-temperature evaporator 8 to cool down, and the moisture in the air will condense into water droplets to achieve condensation dehydration, obtaining relatively low-temperature and dry air; then, the air passes through the heat exchanger 7 to be heated and raised in temperature, and then the high-temperature and dry air continues to enter the dishwashing cavity 1, absorbs the moisture on the wall surface of the dishwashing cavity 1 and tableware to become high-temperature and humid air, and then continues to enter the first air duct 31 for the next cycle until the tableware in the dishwashing cavity 1 is dried.

[0032] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A heat pump dishwasher, characterized in that, It includes a dishwashing cavity (1), a water supply pipeline (2), a heat pump system, a heat exchange chamber (3), a first air duct (31) and a second air duct (32). The dishwashing cavity (1) communicates with the heat exchange chamber (3) through the first air duct (31) and the second air duct (32). A fan (4) is arranged in the heat exchange chamber (3), and the fan (4) can blow air from the first air duct (31) towards the second air duct (32). The heat pump system includes a compressor (5), a condenser (6), an evaporator (8) and a heat exchanger (7). The water supply pipeline (2) can supply water into the dishwashing cavity (1), and the water supply pipeline (2) can exchange heat with the condenser (6). The evaporator (8) and the heat exchanger (7) are located in the heat exchange chamber (3), and the evaporator (8) is closer to the first air duct (31) than the heat exchanger (7). The condenser (6) includes a condenser first port (61) and a condenser second port (62). The heat exchanger (7) includes a heat exchanger first port (71) and a heat exchanger second port (72). The heat exchanger first port (71) can communicate with the outlet of the compressor (5), and the heat exchanger second port (72) communicates with the evaporator (8). The condenser first port (61) can communicate with the outlet of the compressor (5), and the condenser second port (62) can communicate with the heat exchanger first port (71).

2. The heat pump dishwasher according to claim 1, wherein The heat pump system further includes a three-way valve (9). The three-way valve (9) includes a three-way valve first port (91), a three-way valve second port (92) and a three-way valve third port (93). The three-way valve first port (91) is connected to the outlet of the compressor (5), the three-way valve second port (92) is connected to the condenser first port (61), and the three-way valve third port (93) is connected to the heat exchanger first port (71).

3. The heat pump dishwasher according to claim 1, wherein, The heat pump system further includes a throttling element one (10) and a throttling element two (11). The throttling element one (10) is arranged at the heat exchanger second port (72), and the throttling element two (11) is arranged at the condenser second port (62).

4. The heat pump dishwasher according to claim 3, characterized in that Both the throttling element one (10) and the throttling element one (10) are electronic expansion valves.

5. The heat pump dishwasher according to claim 1, characterized in that It further includes a first air damper (33) and a second air damper (34). The first air damper (33) includes a first air damper first port (331), a first air damper second port (332) and a first air damper third port (333). The first air damper first port (331) is connected to the heat exchange chamber (3), the first air damper second port (332) is connected to the first air duct, and the third end of the first air damper (33) communicates with the external environment. The first air damper (33) can switch the connection between the first air damper first port (331) and the first air damper second port (332), or the connection between the first air damper first port (331) and the first air damper third port (333). The second air damper (34) includes a first port (341) of the second air damper, a second port (342) of the second air damper, and a third port (343) of the second air damper. The first port (341) of the second air damper is connected to the heat exchange chamber (3), the second port (342) of the second air damper is connected to the second air duct, the third end of the second air damper (34) communicates with the external environment, and the second air damper (34) can switch the first port (341) of the second air damper to communicate with the second port (342) of the second air damper, or the first port (341) of the second air damper to communicate with the third port (343) of the second air damper.

6. The heat pump dishwasher according to claim 1, wherein The condenser (6) is a water-cooled condenser (6), and the heat exchanger (7) is an air-cooled heat exchanger (7).

7. A control method for a heat pump dishwasher according to any one of claims 1-6, characterized in that, It includes a washing stage and a drying stage. During the washing stage, the condenser (6) dissipates heat outward, and the heat exchanger (7) and the evaporator (8) absorb heat outward; the water supply pipeline (2) supplies water into the dishwashing cavity (1), and the water flow in the water supply pipeline (2) flows through the condenser (6) and exchanges heat with the condenser (6); the air in the heat exchange chamber (3) flows through the heat exchanger (7) and the evaporator (8) and absorbs heat outward; During the drying stage, the heat exchanger (7) dissipates heat outward, and the evaporator (8) absorbs heat outward; the air in the heat exchange chamber (3) and the dishwashing cavity (1) circulates, and the air first flows through the evaporator (8) for condensation and then flows through the heat exchanger (7) for heating to circulate and dry the dishwashing cavity (1).

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