Dishwasher heat pump system and dishwasher

Abstract

The dishwasher heat pump system comprises a compressor, a first air heat exchanger and a condenser, and has a first air duct; the dishwasher heat pump system comprises a first branch, which can be used for circulating refrigerant, and the first branch comprises a first end and a second end, the first end is connected between the outlet of the compressor and the condenser, and the second end is connected between the inlet of the compressor and the first air heat exchanger; the dishwasher heat pump system comprises a washing mode and a dehumidification mode, in the washing mode, the outlet of the compressor is in communication with a first refrigerant flow path; in the dehumidification mode, the outlet of the compressor is in communication with the first branch, and the first branch is in communication with a second refrigerant flow path; the application also provides a dishwasher. In the application, the first branch in the dishwasher heat pump system is provided, so that the first air heat exchanger can serve as an evaporator in the washing mode and can serve as a condenser in the dehumidification mode, thereby protecting the stable operation of the dishwasher heat pump system.

Description

Technical Field

[0001] This invention belongs to the field of dishwasher technology, specifically relating to a dishwasher heat pump system and a dishwasher. Background Technology

[0002] Dishwashers include a washing stage and a drying or dehumidifying stage. The washing stage requires rinsing pots and pans with hot water at a certain temperature to remove stubborn grease. After the washing stage, the dishwasher needs to dry or dehumidify the surface of the dishes to prevent bacterial growth and hygiene hazards caused by a damp environment. Heat generation is a core functional requirement of dishwashers, affecting their overall performance. Applying a heat pump system to dishwashers significantly reduces energy consumption. However, some related technologies have shown that dishwasher heat pump systems can be unstable during operation. Summary of the Invention

[0003] Since there are many factors that affect the unstable operation of the dishwasher heat pump system, the inventors discovered through extensive experimental research that the flow path setting of the dishwasher heat pump system in related technologies causes the temperature inside the washing chamber to rise continuously, resulting in an excessively high temperature in the evaporator environment during dehumidification mode, which in turn leads to an excessively high exhaust temperature of the compressor, thus affecting the normal operation of the dishwasher.

[0004] The purpose of this application is to provide a dishwasher heat pump system, the dishwasher heat pump system including a compressor, a first air heat exchanger and a condenser, the dishwasher heat pump system having a first air duct; the evaporator is located in the first air duct, the first air duct can be used to communicate with the inner cavity of the dishwasher's washing chamber, and the first air heat exchanger is located outside the first air duct;

[0005] The dishwasher heat pump system includes a first branch that can be used to circulate refrigerant. The first branch includes a first end and a second end. The first end is connected between the outlet of the compressor and the condenser, and the second end is connected between the inlet of the compressor and the first air heat exchanger.

[0006] The condenser includes a first refrigerant flow path, the first air heat exchanger includes a second refrigerant flow path, and the evaporator includes a third refrigerant flow path. The dishwasher heat pump system includes a washing mode and a dehumidification mode. In the washing mode, the compressor outlet is connected to the first refrigerant flow path, the first refrigerant flow path is connected to the second refrigerant flow path, and the second refrigerant flow path is connected to the compressor inlet. In the dehumidification mode, the compressor outlet is connected to the first branch, the first branch is connected to the second refrigerant flow path, the second refrigerant flow path is connected to the third refrigerant flow path, and the third refrigerant flow path is connected to the compressor inlet.

[0007] In this application, the dishwasher heat pump system includes a first branch. The first end of the first branch is connected between the compressor outlet and the condenser, and the second end is connected between the compressor inlet and the first air heat exchanger. In washing mode, the compressor outlet is connected to the first refrigerant flow path, and the second refrigerant flow path is connected to the compressor inlet. In dehumidification mode, the compressor outlet is connected to the first branch, the first branch is connected to the second refrigerant flow path, and the third refrigerant flow path is connected to the compressor inlet. This first branch configuration allows the first air heat exchanger to function as an evaporator in washing mode and as a condenser in dehumidification mode. In dehumidification mode, the first air heat exchanger, acting as a condenser, is located outside the first air duct, reducing the risk of excessively high temperatures within the first air duct. This lowers the ambient temperature of the evaporator, thereby reducing the risk of the compressor exhaust temperature exceeding its operating range and protecting the stable operation of the dishwasher heat pump system.

[0008] This application also provides a dishwasher, including a dishwasher heat pump system and a washing chamber; the dishwasher heat pump system includes a compressor, a first air heat exchanger, an evaporator and a condenser, the dishwasher heat pump system has a first air duct, the first air duct is connected to the inner cavity of the washing chamber; the evaporator is located in the first air duct, and the first air heat exchanger is located outside the first air duct.

[0009] The dishwasher heat pump system includes a first branch for circulating refrigerant. The first branch includes a first end and a second end. The first end is connected between the outlet of the compressor and the condenser, and the second end is connected between the inlet of the compressor and the first air heat exchanger. The condenser includes a first refrigerant flow path, the first air heat exchanger includes a second refrigerant flow path, and the evaporator includes a third refrigerant flow path.

[0010] The dishwasher includes a washing mode and a dehumidification mode. In the washing mode, the compressor outlet is connected to the first refrigerant flow path, the first refrigerant flow path is connected to the second refrigerant flow path, and the second refrigerant flow path is connected to the compressor inlet. In the dehumidification mode, the compressor outlet is connected to the first branch path, the first branch path is connected to the second refrigerant flow path, the second refrigerant flow path is connected to the third refrigerant flow path, and the third refrigerant flow path is connected to the compressor inlet.

[0011] In this application, the dishwasher includes a first branch. A first end of the first branch is connected between the compressor outlet and the condenser, and a second end is connected between the compressor inlet and a first air heat exchanger. In washing mode, the compressor outlet is connected to a first refrigerant flow path, and a second refrigerant flow path is connected to the compressor inlet. In dehumidification mode, the compressor outlet is connected to the first branch, the first branch is connected to the second refrigerant flow path, and a third refrigerant flow path is connected to the compressor inlet. This first branch configuration allows the first air heat exchanger to function as an evaporator in washing mode and as a condenser in dehumidification mode. In dehumidification mode, the first air heat exchanger, acting as a condenser, is located outside the first air duct, reducing the risk of excessively high temperatures within the first air duct. This lowers the ambient temperature of the evaporator, thereby reducing the risk of the compressor exhaust temperature exceeding its operating range and protecting the stable operation of the dishwasher. Attached Figure Description

[0012] Figure 1 This is an overall schematic diagram of the dishwasher heat pump system in this application;

[0013] Figure 2 for Figure 1 A schematic diagram of the refrigerant flow path under medium washing mode;

[0014] Figure 3 for Figure 1 A schematic diagram of the washing liquid flow path under medium washing mode;

[0015] Figure 4 for Figure 1 A schematic diagram of the refrigerant flow path in medium dehumidification mode. Detailed Implementation

[0016] To facilitate understanding of this application, it will be described below with reference to the accompanying drawings.

[0017] Figure 1-4 The diagram shows a dishwasher heat pump system conforming to this application. The dishwasher heat pump system includes a compressor 11, a first air heat exchanger 17, an evaporator 23, and a condenser 13. The dishwasher heat pump system has a first air duct 400. The evaporator 23 is located in the first air duct 400, and the first air duct can be used to communicate with the inner cavity of the washing chamber 300 of the dishwasher. The first air heat exchanger 17 is located outside the first air duct 400. The dishwasher heat pump system includes a first branch a, which can be used to circulate refrigerant. The first branch a includes a first end 101 and a second end 102. The first end 101 is connected between the outlet of the compressor 11 and the condenser 13, and the second end 102 is connected between the inlet of the compressor 11 and the first air heat exchanger 17.

[0018] In some embodiments, the dishwasher heat pump system has a washing mode and a dehumidification mode. The condenser 13 includes a first refrigerant flow path, the first air heat exchanger 17 includes a second refrigerant flow path, and the evaporator 23 includes a third refrigerant flow path. In the washing mode, the outlet of the compressor 11 is connected to the first refrigerant flow path, the first refrigerant flow path is connected to the second refrigerant flow path, and the second refrigerant flow path is connected to the inlet of the compressor 11. In the dehumidification mode, the outlet of the compressor 11 is connected to the first branch a, the first branch a is connected to the second refrigerant flow path, the second refrigerant flow path is connected to the third refrigerant flow path, and the third refrigerant flow path is connected to the inlet of the compressor 11.

[0019] In this application, the dishwasher heat pump system includes a first branch a. The first end 101 of the first branch a is connected between the outlet of the compressor 11 and the condenser 13, and the second end 102 is connected between the inlet of the compressor 11 and the first air heat exchanger 17. In the washing mode, the outlet of the compressor 11 is connected to the first refrigerant flow path, and the second refrigerant flow path is connected to the inlet of the compressor 11. In the dehumidification mode, the outlet of the compressor 11 is connected to the first branch a, the first branch a is connected to the second refrigerant flow path, and the third refrigerant flow path is connected to the inlet of the compressor 11. The arrangement of the first branch a allows the first air heat exchanger 17 to function as an evaporator in the washing mode and as a condenser in the dehumidification mode. In the dehumidification mode, the first air heat exchanger 17, acting as a condenser, is located outside the first air duct, which can reduce the risk of excessively high temperature inside the first air duct 400, thereby reducing the temperature of the environment where the evaporator 23 is located, and further reducing the risk of the compressor 11 exhaust temperature exceeding the operating range, thus protecting the stable operation of the dishwasher heat pump system.

[0020] refer to Figure 1 As shown, in some embodiments, the dishwasher heat pump system includes a main circuit A, which includes a first main circuit A1 and a second main circuit A2, both of which can be used to circulate refrigerant; a compressor 11 is disposed on the first main circuit A1, the second main circuit A2 includes a second refrigerant flow path, and the dishwasher heat pump system includes a first switching valve 12, which is disposed between the first main circuit A1 and the second main circuit A2, and can be used to switch the connection between the first main circuit A1 and the second main circuit A2 or the first branch circuit a.

[0021] In some embodiments, the first switching valve 12 includes, but is not limited to, a multi-way valve, such as a three-way valve or a four-way valve; further, in some embodiments, the first switching valve 12 includes a first valve port 121, a second valve port 122 and a third valve port 123, the first main line A1 is connected to the first valve port 121, and the first switching valve 12 can switch the connection between the first valve port 121 and the second valve port 122, or the connection between the first valve port 121 and the third valve port 123, thereby enabling different operating modes of the dishwasher heat pump system.

[0022] Furthermore, in some embodiments, in the washing mode, the first main path A1 is connected to the second main path A2, the first refrigerant flow path is connected to the second refrigerant flow path, and the second refrigerant flow path is connected to the inlet of the compressor 11; in the dehumidification mode, the first main path A1 is connected to the first branch path a, the first branch path a is connected to the second refrigerant flow path, the second refrigerant flow path is connected to the third refrigerant flow path, and the third refrigerant flow path is connected to the inlet of the compressor 11.

[0023] In some embodiments, the dishwasher heat pump system includes a first sub-path g, which is used to circulate refrigerant. The first sub-path g includes a first side end 111 and a second side end 112. The first side end 111 is connected between the condenser 13 and the evaporator 23, and the second side end 112 is connected between the evaporator 23 and the inlet of the compressor 11. The first sub-path g includes a second refrigerant flow path. The second refrigerant flow path includes a first port 103 and a second port 104. The second end 102 of the first branch a is connected between the inlet of the compressor 11 and the first port 103. The first branch a is connected to the first sub-path g. With the first branch a configured in this way, the outlet of compressor 11 is connected to the first main branch A1. The first switching valve 12 can switch the connection between the first main branch A1 and the second main branch A2, or between the first main branch A1 and the first branch a. When the first main branch A1 is connected to the second main branch A2, the second main branch A2 is connected to the first sub-branch g, and the first sub-branch g is connected to the first refrigerant branch. The first air heat exchanger 17 acts as an evaporator. When the first main branch A1 is connected to the first branch a, the first branch a is connected to the first sub-branch g, and the first sub-branch g is connected to the first refrigerant branch. The first air heat exchanger 17 acts as a condenser. That is, the first switching valve 12 can switch between different operating modes of the dishwasher heat pump system. The first air heat exchanger 17 can act as both an evaporator and a condenser. This system flow path configuration enables the dishwasher heat pump system to operate more stably.

[0024] In some embodiments, the dishwasher heat pump system includes a first control valve 10, which is disposed in a first sub-circuit g. The first control valve 10 is located between the inlet of the compressor 11 and the first air heat exchanger 17. The first control valve 10 can control the connection or disconnection between the first sub-circuit g and the first main circuit A1. The second end 102 of the first branch a is connected between the first control valve 10 and the first port 103. In the washing mode, the first sub-circuit g is connected to the first main circuit A1, and in the dehumidification mode, the first sub-circuit g is disconnected from the first main circuit A1.

[0025] In some embodiments, the dishwasher heat pump system includes a bidirectional throttling device 16 disposed in a first sub-circuit g; the bidirectional throttling device 16 is capable of controlling the flow of refrigerant in the first sub-circuit g from a first side end 111 to a second side end 112, or from a second side end 112 to a first side end 111.

[0026] Furthermore, in some embodiments, in the washing mode, the refrigerant in the first sub-circuit g flows from the first side end 111 to the second side end 112, and in the dehumidification mode, the refrigerant in the first sub-circuit g flows from the second side end 112 to the first side end 111. This application uses only one bidirectional throttling device 12, which can realize the dual system functions of washing mode and dehumidification mode, thus reducing production costs.

[0027] In some embodiments, the dishwasher heat pump system includes at least one drying filter device, a bidirectional throttling device 16 is disposed between two adjacent drying filter devices, and at least one drying filter device is disposed in the first sub-path g to achieve bidirectional flow of refrigerant in the first sub-path g; further, the dishwasher heat pump system includes a first drying filter device 6 and a second drying filter device 7, the bidirectional throttling device 16 is disposed between the first drying filter device 6 and the second drying filter device 7, and at least one of the first drying filter device 6 and the second drying filter device 7 is disposed in the first sub-path g, which can absorb moisture in the refrigerant and filter impurities in the refrigerant at the same time, reducing pipe blockage in the heat pump system.

[0028] In some embodiments, the dishwasher heat pump system includes a second sub-path h, which can be used to circulate refrigerant; the dishwasher heat pump system includes a second control valve 15, which is disposed in the second sub-path h, and the second control valve 15 can control the connection or disconnection of the second main path A2 with the second sub-path h, or the second control valve 15 can control the connection or disconnection of the first sub-path g with the second sub-path h.

[0029] In some embodiments, the dishwasher heat pump system includes a liquid storage device 4 and a one-way valve 5. Both the liquid storage device 4 and the one-way valve 5 are located in the second main circuit A2. The one-way valve 5 is located between the condenser 13 and the first side end 111, and controls the refrigerant flow from the first refrigerant flow path to the first side end 111. Further, in some embodiments, in washing mode, the second main circuit A2 is connected to the first sub-circuit g; in dehumidification mode, the first sub-circuit g is connected to the second sub-circuit h.

[0030] In some implementations, one end of the first main line A1 is connected to the first switching valve 12, the other end of the first main line A1 is connected between the first sub-line g and the second sub-line h, one end of the second main line A2 is connected between the first main line A1 and the first sub-line g, and one end of the second main line A2 is connected between the second main line A2 and the first sub-line g.

[0031] In some embodiments, the dishwasher heat pump system has a second air duct 100, in which the first air heat exchanger 17 and the condenser 13 are both located. The second air duct 100 is connected to the external environment, and the second refrigerant flow path of the first air heat exchanger 17 can exchange heat with the external environment.

[0032] In some embodiments, the dishwasher heat pump system includes at least two fans, including a first fan 18 and a second fan 22. The first fan 18 is located within a second air duct 100, and the second fan 22 is located within a first air duct 400. In washing mode, the first fan 18 is turned on and the second fan 22 is turned off. The first fan 18 can drive the circulation of air around the first air heat exchanger 17, thereby improving the heat exchange efficiency of the first air heat exchanger 17. In dehumidification mode, the first fan 18 is turned off and the second fan 22 is turned on. The second fan 22 can drive the circulation of air around the evaporator 23, thereby improving the heat exchange efficiency of the evaporator 23 to achieve better dehumidification.

[0033] In some embodiments, the condenser 13 includes a first washing liquid flow path, and the dishwasher heat pump system includes a second washing liquid flow path m and a third washing liquid flow path f. The first washing liquid flow path, the second washing liquid flow path m, and the third washing liquid flow path f can all be used to circulate washing liquid, and the first washing liquid flow path and the second washing liquid flow path m are connected. The dishwasher heat pump system includes a first water pump 24 and a third control valve 254. The first water pump 24 is disposed in the second washing liquid flow path m, and the third control valve 254 is disposed in the third washing liquid flow path f. The third control valve 254 can be used to control the connection or disconnection of the second washing liquid flow path m and the third washing liquid flow path f.

[0034] It should be noted that the first control valve 10, the second control valve 15, and the third control valve 254 include, but are not limited to, shut-off valves, solenoid valves, etc.

[0035] This application also provides a dishwasher, including the dishwasher heat pump system and washing chamber 300 described above; the dishwasher heat pump system includes a compressor 11, a first air heat exchanger 17, an evaporator 23 and a condenser 13, the first air heat exchanger 17 and the condenser 13 are both located on the periphery of the washing chamber 300, and the evaporator 23 is located in the inner cavity of the washing chamber 300; the dishwasher heat pump system includes a first branch a, which can be used to circulate refrigerant, the first branch a includes a first end 101 and a second end 102, the first end 101 is connected between the outlet of the compressor 11 and the condenser 13, and the second end 102 is connected between the inlet of the compressor 11 and the first air heat exchanger 17; the condenser 13 includes a first refrigerant flow path, the first air heat exchanger 17 includes a second refrigerant flow path, and the evaporator 23 includes a third refrigerant flow path.

[0036] In some embodiments, the dishwasher has a washing mode and a dehumidification mode. The condenser 13 includes a first refrigerant flow path, the first air heat exchanger 17 includes a second refrigerant flow path, and the evaporator 23 includes a third refrigerant flow path. In the washing mode, the outlet of the compressor 11 is connected to the first refrigerant flow path, the first refrigerant flow path is connected to the second refrigerant flow path, and the second refrigerant flow path is connected to the inlet of the compressor 11. In the dehumidification mode, the outlet of the compressor 11 is connected to the first branch a, the first branch a is connected to the second refrigerant flow path, the second refrigerant flow path is connected to the third refrigerant flow path, and the third refrigerant flow path is connected to the inlet of the compressor 11.

[0037] In this application, the dishwasher includes the dishwasher heat pump system described above. The dishwasher heat pump system includes a first branch a. The first end 101 of the first branch a is connected between the outlet of the compressor 11 and the condenser 13, and the second end 102 is connected between the inlet of the compressor 11 and the first air heat exchanger 17. In the washing mode, the outlet of the compressor 11 is connected to the first refrigerant flow path, and the second refrigerant flow path is connected to the inlet of the compressor 11. In the dehumidification mode, the outlet of the compressor 11 is connected to the first branch a, the first branch a is connected to the second refrigerant flow path, and the third refrigerant flow path is connected to the inlet of the compressor 11. The arrangement of the first branch a allows the first air heat exchanger 17 to function as an evaporator in the washing mode and as a condenser in the dehumidification mode. Furthermore, the first air heat exchanger 17 and the condenser 13 are located outside the first air duct 400, which can reduce the risk of excessively high temperature inside the first air duct 400, thereby reducing the risk of the compressor 11 exhaust temperature exceeding the operating range and protecting the stable operation of the dishwasher heat pump system.

[0038] In some embodiments, the condenser 13 includes a first washing liquid flow path, and the dishwasher includes a second washing liquid flow path m and a third washing liquid flow path f. The first washing liquid flow path, the second washing liquid flow path m, and the third washing liquid flow path f can all be used to circulate washing liquid, and the first washing liquid flow path and the second washing liquid flow path m are connected.

[0039] In some embodiments, the dishwasher includes a water collection tank 29, and a second washing liquid flow path m and a third washing liquid flow path f are both connected to the water collection tank 29; the dishwasher heat pump system includes a spray channel 30, which is connected to the inner cavity of the washing chamber 300; the third washing liquid flow path f is connected to the spray channel 30.

[0040] In some embodiments, the dishwasher further includes a fourth washing liquid flow path e, which is connected to the water collection tank 29; the dishwasher includes a water injection valve 27 and a water treatment device 28, both of which are located in the fourth washing liquid flow path e; the dishwasher also includes a second water pump 26, which is capable of discharging the washing liquid in the water collection tank 29 into the dishwasher.

[0041] refer to Figure 1 and Figure 2 As shown, in some embodiments, the dishwasher includes a washing mode and a dehumidification mode. The washing mode includes a refrigerant flow path and a washing liquid flow path. The refrigerant flow path is as follows: the first switching valve 12 switches the first main line A1 and the second main line A2 to be connected, that is, the first valve port 121 is connected to the second valve port 122, and the first valve port 121 is disconnected from the third valve port 123. The high-temperature and high-pressure gaseous refrigerant flows from the outlet of the compressor 11 through the first main line A1 to the second main line A2, flows through the first refrigerant flow path of the condenser 13, and exchanges heat with the first washing liquid flow path, becoming a high-temperature and high-pressure liquid refrigerant. The refrigerant in the first refrigerant flow path exchanges heat. The refrigerant then flows to the first sub-path g. At this time, the second control valve 15 is closed. The refrigerant in the first sub-path g passes through the liquid storage device 4, the first one-way valve 5, and the first dryer filter 6 to reach the bidirectional throttling device 16. After being throttled by the bidirectional throttling device 16, the refrigerant becomes a gas-liquid two-phase state and flows to the second refrigerant flow path of the first air heat exchanger 17 (as an evaporator). The first fan 18 drives the surrounding external wind to exchange heat with the refrigerant in the second refrigerant flow path. The first control valve 10 opens. After absorbing heat, the refrigerant in the second refrigerant flow path becomes a low-temperature, low-pressure gas and flows to the first main path A1. It returns to the compressor 11 from the inlet of the compressor 11, completing one refrigerant circulation path cycle.

[0042] refer to Figure 3As shown, in some embodiments, the washing liquid flow path in the washing mode is as follows: the first water pump 24 is started, the washing liquid stored in the water collection tank 29 enters the second washing liquid flow path m, the third control valve 254 is opened, a portion of the washing liquid flows to the third washing liquid flow path f, the washing liquid in the third washing liquid flow path f enters the first washing liquid flow path, exchanges heat with the refrigerant in the first refrigerant flow path, the temperature of the washing liquid rises, and then returns to the water collection tank 29; another portion of the washing liquid in the second washing liquid flow path m is sprayed into the washing chamber 300 through the spray channel 30 for... The pre-washing of tableware in the washing chamber 300 is followed by the return of the sprayed fluid to the collection tank 29. The washing liquid in the third washing liquid flow path f mixes with the sprayed washing liquid in the collection tank 29, raising the temperature of the washing liquid in the collection tank 29 and continuously circulating until the washing temperature required for tableware such as bowls and chopsticks is reached. When the washing temperature is reached, the third control valve 254 closes, and the washing liquid in the collection tank 29 enters the spray channel 30 through the second washing liquid m and is sprayed into the washing chamber 30. The sprayed washing liquid then flows back to the collection tank 29, completing a washing liquid circulation cycle.

[0043] In some embodiments, a temperature sensor (not shown) is installed on the water collection tank 29 to monitor whether the temperature of the washing liquid (such as water) in the water collection tank 29 meets the washing temperature. When the washing temperature is met, the third control valve 254 is closed, that is, the second washing liquid flow path m is connected to the spray channel 30, so that the washing liquid in the water collection tank 300 is sprayed into the washing chamber 300 through the spray channel 30. When the washing temperature is not met, the third control valve 254 is opened, and the second washing liquid flow path m is connected to the third washing liquid flow path f, so that the washing liquid in the third washing liquid flow path f flows into the first washing liquid flow path of the condenser 13, exchanges heat with the first refrigerant flow path to raise the temperature, and then the washing liquid in the third washing liquid flow path f flows into the water collection tank 29.

[0044] refer to Figure 4As shown, in some embodiments, the dehumidification mode includes a refrigerant flow path and a moisture circulation flow path. The refrigerant circulation path is as follows: the first switching valve 12 switches the first main line A1 to connect with the first branch line a, the first valve port 121 to connect with the third valve port 123, and the first valve port 121 to disconnect from the second valve port 122. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 11 outlet passes through the first valve 12, the first main line A1 and the first branch line a are connected, and the high-temperature and high-pressure gaseous refrigerant flows to the second refrigerant flow path in the first air heat exchanger 17 (as a condenser). After releasing heat, it becomes a high-temperature and high-pressure liquid refrigerant. After passing through the second dryer filter 7 of the first sub-line g, and then through the bidirectional throttling valve 16, it becomes a gas-liquid two-phase refrigerant and enters the third refrigerant flow path of the evaporator 23. After absorbing heat, it becomes a low-temperature and low-pressure gaseous refrigerant. After passing through the first main line A1, it returns to the compressor 11 from the inlet of the compressor 11, forming a refrigerant circulation path.

[0045] In some implementations, the flow path of the gas-liquid two-state washing liquid in dehumidification mode is as follows: when the second fan 22 is running, the high-temperature and high-humidity gaseous washing liquid in the washing chamber 300 is liquefied and condensed into liquid on the surface of the evaporator 23 and discharged. The water droplets formed on the surface of the evaporator 23 are discharged from the dishwasher through the water collection tank and other equipment, forming a dehumidification cycle. This cycle continues until the dehumidification requirements of the tableware are met.

[0046] It should be noted that the refrigerants mentioned in this application include, but are not limited to, R22, R32, R290, R410A, etc.; the washing liquid includes, but is not limited to, water, cleaning agents, and liquids mixed with water and cleaning agents.

[0047] In this application, a first branch a is provided. In different operating modes, the first air heat exchanger 17 can be selected as an evaporator or a condenser. In dehumidification mode, the first air heat exchanger 17, which acts as a condenser, is located outside the first air duct 400. This can reduce the risk of the first air duct 400 being too hot, that is, reduce the risk of the washing chamber 300 being too hot, thereby reducing the risk of the compressor 11 exhaust temperature exceeding the operating range and protecting the stable operation of the dishwasher heat pump system.

Claims

1. A dishwasher heat pump system, characterized in that, The dishwasher heat pump system includes a compressor (11), a first air heat exchanger (17), an evaporator (23), and a condenser (13); the dishwasher heat pump system has a first air duct (400), the evaporator (23) is located in the first air duct (400), the first air duct (400) can be used to communicate with the inner cavity of the dishwasher's washing chamber (300), and the first air heat exchanger (17) is located outside the first air duct (400); The dishwasher heat pump system includes a first branch (a) which is used to circulate refrigerant. The first branch (a) includes a first end (101) and a second end (102). The first end (101) is connected between the outlet of the compressor (11) and the condenser (13), and the second end (102) is connected between the inlet of the compressor (11) and the first air heat exchanger (17). The condenser (13) includes a first refrigerant flow path, the first air heat exchanger (17) includes a second refrigerant flow path, and the evaporator (23) includes a third refrigerant flow path; The dishwasher heat pump system has a washing mode and a dehumidification mode. In the washing mode, the outlet of the compressor (11) is connected to the first refrigerant flow path, the first refrigerant flow path is connected to the second refrigerant flow path, and the second refrigerant flow path is connected to the inlet of the compressor (11). In the dehumidification mode, the outlet of the compressor (11) is connected to the first branch (a), the first branch (a) is connected to the second refrigerant flow path, the second refrigerant flow path is connected to the third refrigerant flow path, and the third refrigerant flow path is connected to the inlet of the compressor (11).

2. The dishwasher heat pump system according to claim 1, characterized in that, The dishwasher heat pump system includes a main circuit (A), which includes a first main circuit (A1) and a second main circuit (A2). Both the first main circuit (A1) and the second main circuit (A2) can be used to circulate refrigerant. The compressor (11) is located on the first main circuit (A1), and the inlet and outlet of the compressor (11) are connected to the first main circuit (A1). The second main circuit (A2) includes the first refrigerant flow path. The dishwasher heat pump system includes a first switching valve (12), which is located between the first main line (A1) and the second main line (A2). The first switching valve (12) can be used to switch the connection between the first main line (A1) and the second main line (A2) or the first branch line (a).

3. The dishwasher heat pump system according to claim 2, characterized in that, In the washing mode, the first main circuit (A1) is connected to the second main circuit (A2), the first refrigerant flow path is connected to the second refrigerant flow path, and the second refrigerant flow path is connected to the inlet of the compressor (11); In the dehumidification mode, the first main path (A1) is connected to the first branch path (a), the first branch path (a) is connected to the second refrigerant flow path, the second refrigerant flow path is connected to the third refrigerant flow path, and the third refrigerant flow path is connected to the inlet of the compressor (11).

4. The dishwasher heat pump system according to claim 2 or 3, characterized in that, The dishwasher heat pump system includes a first sub-path (g) for circulating refrigerant. The first sub-path (g) includes a first side end (111) and a second side end (112). The first side end (111) is connected between the condenser (13) and the evaporator (23), and the second side end (112) is connected between the evaporator (23) and the inlet of the compressor (11). The first sub-path (g) includes a second refrigerant flow path. The second refrigerant flow path includes a first port (103) and a second port (104). The second end (102) of the first branch (a) is connected between the inlet of the compressor (11) and the first port (103). The first branch (a) is connected to the first sub-path (g).

5. The dishwasher heat pump system according to claim 4, characterized in that, The dishwasher heat pump system includes a first control valve (10), which is disposed in the first sub-circuit (g). The first control valve (10) is located between the inlet of the compressor (11) and the first air heat exchanger (17). The first control valve (10) can control the connection or disconnection between the first sub-circuit (g) and the first main circuit (A1). The second end (102) of the first branch (a) is connected between the first control valve (10) and the first port (103).

6. The dishwasher heat pump system according to claim 4, characterized in that, The dishwasher heat pump system includes a bidirectional throttling device (16) disposed in the first sub-path (g); The bidirectional throttling device (16) can be used to control the refrigerant of the first sub-circuit (g) to flow from the first side end (111) to the second side end (112), or from the second side end (112) to the first side end (111).

7. The dishwasher heat pump system according to claim 6, characterized in that, The dishwasher heat pump system includes a drying and filtering device (6, 7), which is located in the first sub-path (g) and is located adjacent to the bidirectional throttling device (16).

8. The dishwasher heat pump system according to any one of claims 5-7, characterized in that, The dishwasher heat pump system includes a second sub-path (h) that can be used to circulate refrigerant; The dishwasher heat pump system includes a second control valve (15) and a one-way valve (5). The second control valve (15) is located in the second sub-circuit (h). The second control valve (15) can control the connection or disconnection of the second main circuit (A2) and the second sub-circuit (h). The second control valve (15) can also control the connection or disconnection of the first sub-circuit (g) and the second sub-circuit (h). The one-way valve (5) is disposed in the second main line (A2). The one-way valve (5) is located between the condenser (13) and the first side end (111). The one-way valve (5) can be used to control the refrigerant to flow from the first refrigerant flow path to the first side end (111). In the washing mode, the second main path (A2) is connected to the first sub-path (g); In the dehumidification mode, the first sub-path (g) is connected to the second sub-path (h).

9. The dishwasher heat pump system according to any one of claims 1-3 and 5-7, characterized in that, The dishwasher heat pump system has a second air duct (100), the first air heat exchanger (17) and the condenser (13) are both located in the second air duct (100), and the evaporator (23) is located outside the second air duct (100); The dishwasher heat pump system includes at least two fans, including a first fan (18) and a second fan (22), wherein the first fan (18) is located in the second air duct (100) and the second fan (22) is located in the first air duct (400); The first fan (18) can be used to drive the circulation of air around the first air heat exchanger (17), and the second fan (22) can be used to drive the circulation of air around the evaporator (23).

10. A dishwasher, characterized in that, The dishwasher includes a dishwasher heat pump system and a washing chamber (300); the dishwasher heat pump system includes a compressor (11), a first air heat exchanger (17), an evaporator (23) and a condenser (13), the dishwasher heat pump system has a first air duct (400), the first air duct (400) is connected to the inner cavity of the washing chamber (300), the evaporator (23) is located in the first air duct (400), and the first air heat exchanger (17) is located outside the first air duct (100); The dishwasher heat pump system includes a first branch (a) which is used to circulate refrigerant. The first branch (a) includes a first end (101) and a second end (102). The first end (101) is connected between the outlet of the compressor (11) and the condenser (13), and the second end (102) is connected between the inlet of the compressor (11) and the first air heat exchanger (17). The condenser (13) includes a first refrigerant flow path, the first air heat exchanger (17) includes a second refrigerant flow path, and the evaporator (23) includes a third refrigerant flow path; The dishwasher has a washing mode and a dehumidification mode. In the washing mode, the outlet of the compressor (11) is connected to the first refrigerant flow path, the first refrigerant flow path is connected to the second refrigerant flow path, and the second refrigerant flow path is connected to the inlet of the compressor (11). In the dehumidification mode, the outlet of the compressor (11) is connected to the first branch (a), the first branch (a) is connected to the second refrigerant flow path, the second refrigerant flow path is connected to the third refrigerant flow path, and the third refrigerant flow path is connected to the inlet of the compressor (11).

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