Multi-working-condition cooling and heating system

Abstract

The utility model relates to a multi-working-condition cooling and heating system, which relates to the field of heating ventilation air conditioning technology, and comprises a compressor, a gas-liquid separator, an economizer, a liquid storage device, a water cooling condenser, an air condenser, an air evaporator and a water evaporator, the compressor is provided with an air condenser and a water-cooling condenser which are communicated, the economizer is communicated with the air condenser and the water-cooling condenser, and a condenser switching module is arranged between the compressor and the air condenser and between the compressor and the water-cooling condenser; a first liquid outlet pipe and a second liquid outlet pipe are arranged on the economizer in a communicating mode, the first liquid outlet pipe is communicated with the liquid storage device, and the liquid outlet end of the second liquid outlet pipe is communicated with the economizer. The liquid storage device is communicated with the air evaporator and the water evaporator, the gas-liquid separator is communicated with a fifth liquid outlet pipe, the liquid inlet end of the fifth liquid outlet pipe is communicated with the air evaporator and the water evaporator, and an evaporator switching module is arranged between the fifth liquid outlet pipe and the liquid storage device. Various working conditions can be provided for a cooling and heating system in industrial production.

Description

Technical Field

[0001] This application relates to the field of heating, ventilation and air conditioning technology, and in particular to a multi-condition cooling and heating system. Background Technology

[0002] The implementation of dual-carbon policies has placed higher demands on industrial production enterprises to further reduce energy consumption and improve energy efficiency. Heat pumps can transfer heat from low-temperature objects to high-temperature objects, achieving effective utilization of low-grade heat, and are increasingly being used in the field of energy conservation and emission reduction.

[0003] In existing technologies, conventional heat pump units absorb heat from the air or wastewater to produce hot water or hot air, or dissipate heat to the air or water to produce cold water or cold air. Generally, they only produce hot water or hot air. With increasing awareness of energy conservation, some units have also emerged that perform heat recovery during cooling to improve economic efficiency.

[0004] However, conventional heat pump units are mostly suitable for building applications, producing domestic hot water while providing cooling. Their application scenarios are relatively simple. In industrial scenarios, it is sometimes necessary to absorb heat from exhaust gas, sometimes from the air, sometimes to heat hot water, and sometimes to heat the air. The heat source and the object being heated are varied, making it difficult for conventional heat pump units to meet the cooling or heating needs of different operating conditions. There is room for improvement. Summary of the Invention

[0005] In order to provide multiple operating conditions to meet the needs of cooling and heating systems in industrial scenarios, this application provides a multi-condition cooling and heating system.

[0006] The multi-condition cooling and heating system provided in this application adopts the following technical solution:

[0007] A multi-condition cooling and heating system includes a compressor, a gas-liquid separator, an economizer, a liquid receiver, a water-cooled condenser, an air condenser, an air evaporator, and a water evaporator.

[0008] The compressor is equipped with a first gas pipe, the exhaust end of which is connected to the air condenser and the water-cooled condenser. A condenser switching module is provided between the economizer and the water-cooled condenser and the air condenser.

[0009] The economizer is provided with a first liquid outlet pipe and a second liquid outlet pipe. The first liquid outlet pipe is connected to the liquid storage tank. The liquid outlet end of the second liquid outlet pipe is connected to the economizer. An economizer solenoid valve and an economizer electronic expansion valve are installed on the second liquid outlet pipe. The economizer is also provided with a second gas pipe, which is connected to the compressor.

[0010] The liquid storage tank is connected to a fourth liquid outlet pipe, which is connected to the air evaporator and the water evaporator. The gas-liquid separator is connected to a fifth liquid outlet pipe, the inlet of which is connected to the air evaporator and the water evaporator. An evaporator switching module is provided between the fifth liquid outlet pipe and the fourth liquid outlet pipe.

[0011] The gas-liquid separator is connected to a gas supply pipe, and the outlet of the gas supply pipe is connected to the compressor.

[0012] By adopting the above technical solution, in the actual production and processing process, the compressor exhaust is discharged through the first gas pipe. According to the actual production needs, the water-cooled condenser or air condenser can be connected between the economizer and the compressor through the condenser switching module. The refrigerant gas is heated to hot water in the air condenser or water-cooled condenser and becomes refrigerant liquid. The refrigerant liquid is divided into two paths by the economizer. One path flows into the liquid receiver through the first liquid outlet pipe, flows out through the fourth liquid outlet pipe, evaporates through the water evaporator or air evaporator, enters the gas-liquid separator, is absorbed by the compressor, and is compressed and discharged. The other path flows through the second liquid outlet pipe, and then through the economizer solenoid valve and the economizer electronic expansion valve, and flows to the compressor through the second gas pipe. It is absorbed by the compressor and compressed and discharged. Through the condenser switching module and the evaporator switching module, four operating conditions can be provided according to actual production needs: water-cooled condenser-water evaporator, water-cooled condenser-air evaporator, air condenser-water evaporator, and air condenser-air evaporator. These conditions can respectively achieve the technical effects of absorbing heat from wastewater to heat water, absorbing heat from air to heat water, absorbing heat from wastewater to heat air, and absorbing heat from air to heat air, thus providing four operating conditions for cooling and heating needs in industrial scenarios.

[0013] Preferably, the water-cooled condenser is provided with a first branch pipe and a second branch pipe, and the air condenser is provided with a third branch pipe and a fourth branch pipe.

[0014] The air inlet of the first branch pipe and the third branch pipe are connected to the air outlet of the first air pipe, the outlet of the second branch pipe is connected to the economizer, and the port of the fourth branch pipe is connected to the pipe body of the first branch pipe.

[0015] The condenser switching module includes a first ball valve, a second ball valve, a third ball valve, and a fourth ball valve. The first ball valve is installed on the first branch pipe, the second ball valve is installed on the second branch pipe, the third ball valve is installed on the third branch pipe, and the fourth ball valve is installed on the fourth branch pipe. The second ball valve is located between the outlet end of the fourth branch pipe and the water-cooled condenser.

[0016] By adopting the above technical solution, when the water-cooled condenser-water evaporator or water-cooled condenser-air evaporator operation is required, the third and fourth ball valves can be controlled to be closed, while the first and second ball valves are controlled to remain open, thus connecting the water-cooled condenser between the compressor and the economizer; when the air-cooled condenser-water evaporator or air-cooled condenser-air evaporator operation is required, the first and second ball valves can be controlled to be closed, while the third and fourth ball valves are controlled to be open, thus connecting the air-cooled condenser between the compressor and the economizer.

[0017] Preferably, the water evaporator is connected to a fifth branch pipe and a sixth branch pipe, and the air evaporator is connected to a seventh branch pipe and an eighth branch pipe.

[0018] The inlet ends of the fifth branch pipe and the seventh branch pipe are connected to the outlet end of the fourth liquid outlet pipe, the outlet end of the sixth branch pipe is connected to the gas-liquid separator, and the outlet end of the eighth branch pipe is connected to the sixth branch pipe.

[0019] The evaporator switching module includes a first electronic expansion valve, a second electronic expansion valve, a fifth ball valve, and a sixth ball valve. The first electronic expansion valve is installed on the fifth branch pipe, the second electronic expansion valve is installed on the seventh branch pipe, the fifth ball valve is installed on the sixth branch pipe, and the fifth ball valve is located between the outlet end of the eighth branch pipe and the water evaporator. The sixth ball valve is installed on the eighth branch pipe.

[0020] By adopting the above technical solution, when the water-cooled condenser-water evaporator or air-condenser-air evaporator is required, the sixth ball valve and the second electronic expansion valve can be controlled to close, while the fifth ball valve and the first electronic expansion valve are kept open, thus connecting the water evaporator between the liquid receiver and the water evaporator; when the air-condenser-air evaporator or water-condenser-air evaporator is required, the fifth ball valve and the first electronic expansion valve can be controlled to close, while the sixth ball valve and the second electronic expansion valve are kept open, thus connecting the air condenser between the liquid receiver and the water evaporator.

[0021] In summary, the beneficial technical effects of the multi-condition cooling and heating system proposed in this application are as follows: through the condenser switching module and the evaporator switching module, four operating conditions can be provided according to actual production needs: water-cooled condenser-water evaporator, water-cooled condenser-air evaporator, air condenser-water evaporator, and air condenser-air evaporator. These conditions can respectively achieve the technical effects of absorbing heat from wastewater to heat hot water, absorbing heat from air to heat hot water, absorbing heat from wastewater to heat air, and absorbing heat from air to heat air, thus providing four operating conditions for cooling and heating needs in industrial scenarios. Attached Figure Description

[0022] Figure 1This is a schematic diagram illustrating the overall structure of the cooling and heating system in an embodiment of this application.

[0023] Explanation of reference numerals in the attached diagram: 1. Compressor; 11. First gas pipe; 2. Gas-liquid separator; 21. Fifth liquid outlet pipe; 22. Gas supply pipe; 3. Liquid receiver; 31. Fourth liquid outlet pipe; 4. Economizer; 41. First liquid outlet pipe; 42. Second liquid outlet pipe; 43. Second gas pipe; 44. Economizer solenoid valve; 45. Economizer electronic expansion valve; 5. Water-cooled condenser; 51. First branch pipe; 52. Second branch pipe; 53. First ball valve; 54. Second ball valve; 6. Air condenser; 61. Third branch pipe; 62. Fourth branch pipe; 63. Third ball valve; 64. Fourth ball valve; 7. Air evaporator; 71. Seventh branch pipe; 72. Eighth branch pipe; 73. Second electronic expansion valve; 74. Sixth ball valve; 8. Water evaporator; 81. Fifth branch pipe; 82. Sixth branch pipe; 83. First electronic expansion valve; 84. Fifth ball valve. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0025] Example

[0026] This application discloses a multi-condition cooling and heating system. (Refer to...) Figure 1 It mainly includes a compressor 1, a gas-liquid separator 2, an economizer 4, a liquid receiver 3, a water-cooled condenser 5, an air condenser 6, an air evaporator 7, and a water evaporator 8; a first gas pipe 11 is installed on the compressor 1, and the exhaust end of the first gas pipe 11 is connected to the air condenser 6 and the water-cooled condenser 5; a condenser switching module is provided between the economizer 4 and the water-cooled condenser 5 and the air condenser 6.

[0027] The economizer 4 is connected to a first liquid outlet pipe 41 and a second liquid outlet pipe 42. The first liquid outlet pipe 41 is connected to the liquid reservoir 3, and the liquid outlet end of the second liquid outlet pipe 42 is connected to the economizer. The second liquid outlet pipe 42 is equipped with an economizer solenoid valve 44 and an economizer electronic expansion valve 45. The economizer is also connected to a second gas pipe 43, which is connected to the compressor 1.

[0028] A fourth liquid outlet pipe 31 is connected to the liquid receiver 3, and the fourth liquid outlet pipe 31 is connected to the air evaporator 7 and the water evaporator 8. A fifth liquid outlet pipe 21 is connected to the gas-liquid separator 2, and the liquid inlet of the fifth liquid outlet pipe 21 is connected to the air evaporator 7 and the water evaporator 8. An evaporator switching module is provided between the fifth liquid outlet pipe 21 and the fourth liquid outlet pipe 31. A gas supply pipe 22 is connected to the gas separator 2, and the gas outlet of the gas supply pipe 22 is connected to the compressor 1.

[0029] During actual production and processing, the compressor 1 discharges exhaust gas through the first gas pipe 11. According to the actual production needs, the water-cooled condenser 5 or the air condenser 6 can be connected between the economizer and the compressor 1 through the condenser switching module. The refrigerant gas is heated to hot water in the air condenser 6 or the water-cooled condenser 5 and becomes refrigerant liquid. The refrigerant liquid is divided into two paths by the economizer. One path flows into the liquid receiver 3 through the first liquid outlet pipe 41, and after evaporation by the water evaporator 8 or the air evaporator 7, it enters the gas-liquid separator 2, is absorbed by the compressor 1, and is compressed and discharged. The other path flows through the second liquid outlet pipe 42 and through the economizer solenoid valve 44 and the economizer electronic expansion valve 45, and then flows to the compressor 1 through the second gas pipe 43. It is absorbed by the compressor 1 and compressed and discharged.

[0030] Through the condenser switching module and the evaporator switching module, four operating conditions can be provided according to actual production needs: water-cooled condenser 5-water evaporator 8, water-cooled condenser 5-air evaporator 7, air condenser 6-water evaporator 8, and air condenser 6-air evaporator 7. These conditions can respectively achieve the technical effects of absorbing heat from wastewater to heat water, absorbing heat from air to heat water, absorbing heat from wastewater to heat air, and absorbing heat from air to heat air, thus providing four operating conditions for cooling and heating needs in industrial scenarios.

[0031] Please refer to Figure 1 The water-cooled condenser 5 is connected to a first branch pipe 51 and a second branch pipe 52, and the air condenser 6 is connected to a third branch pipe 61 and a fourth branch pipe 62. The inlet ends of the first branch pipe 51 and the third branch pipe 61 are connected to the outlet ends of the first air pipe 11, the outlet end of the second branch pipe 52 is connected to the economizer, and the port of the fourth branch pipe 62 is connected to the pipe body of the first branch pipe 51. The condenser switching module includes a first ball valve 53, a second ball valve 54, a third ball valve 63, and a fourth ball valve 64. The first ball valve 53 is installed on the first branch pipe 51, the second ball valve 54 is installed on the second branch pipe 52, the third ball valve 63 is installed on the third branch pipe 61, and the fourth ball valve 64 is installed on the fourth branch pipe 62. The second ball valve 54 is located between the outlet end of the fourth branch pipe 62 and the water-cooled condenser 5.

[0032] Reference Figure 1The water evaporator 8 is connected to a fifth branch pipe 81 and a sixth branch pipe 82, and the air evaporator 7 is connected to a seventh branch pipe 71 and an eighth branch pipe 72. The inlet ends of the fifth branch pipe 81 and the seventh branch pipe 71 are connected to the outlet end of the fourth liquid outlet pipe 31, the outlet end of the sixth branch pipe 82 is connected to the gas-liquid separator 2, and the outlet end of the eighth branch pipe 72 is connected to the sixth branch pipe 82. The evaporator switching module includes a first electronic expansion valve 83, a second electronic expansion valve 73, a fifth ball valve 84, and a sixth ball valve 74. The first electronic expansion valve 83 is installed on the fifth branch pipe 81, the second electronic expansion valve 73 is installed on the seventh branch pipe 71, the fifth ball valve 84 is installed on the sixth branch pipe 82, and the fifth ball valve 84 is located between the outlet end of the eighth branch pipe 72 and the water evaporator 8. The sixth ball valve 74 is installed on the eighth branch pipe 72.

[0033] The process of absorbing heat from wastewater to heat hot water (water-cooled condenser 5 - water evaporator 8) is as follows: After the compressor 1 discharges, it flows into the water-cooled condenser 5 through the first gas pipe 11 and the first branch pipe 51. During this process, the first ball valve 53 and the second ball valve 54 in the condenser switching module remain open, while the third ball valve 63 and the fourth ball valve 64 remain closed. The refrigerant gas is condensed into liquid after heating the hot water in the water-cooled condenser 5. The refrigerant liquid flows to the economizer through the second branch pipe 52. After heat exchange in the economizer, the refrigerant liquid flows into the liquid receiver 3 through the first liquid outlet pipe 41. The refrigerant liquid in the unit 3 flows out through the fourth liquid outlet pipe 31, and then flows into the water evaporator 8 through the fifth branch pipe 81 and the first electronic expansion ball valve for evaporation. After passing through the sixth branch pipe 82 and the fifth ball valve 84, it flows to the gas-liquid separator 2. During this process, the sixth ball valve 74 and the second electronic expansion ball valve remain closed. The gas-liquid separator 2 supplies refrigerant vapor to the compressor 1 through the gas supply pipe 22. At the same time, the refrigerant liquid flowing out of the economizer through the second liquid outlet pipe 42 flows back into the economizer to evaporate and form refrigerant vapor, which is then supplied to the compressor 1 through the second gas pipe 43.

[0034] The process of heating hot water by absorbing heat from the air (water-cooled condenser 5 - air evaporator 7) is as follows: After the compressor 1 discharges, it flows into the water-cooled condenser 5 through the first gas pipe 11 and the first branch pipe 51. During this process, the first ball valve 53 and the second ball valve 54 in the condenser switching module remain open, while the third ball valve 63 and the fourth ball valve 64 remain closed. The refrigerant gas is condensed into liquid after heating the hot water in the water-cooled condenser 5. The refrigerant liquid flows sequentially through the fourth branch pipe 62 and the second branch pipe 52 to the economizer. After heat exchange in the economizer, the refrigerant liquid flows into the liquid receiver 3 through the first liquid outlet pipe 41. Inside, the refrigerant liquid in the receiver 3 flows out through the fourth outlet pipe 31, and then flows into the air evaporator 7 through the seventh branch pipe 71 and the second electronic expansion ball valve for evaporation. After passing through the eighth branch pipe 72 and the sixth ball valve 74, it flows to the gas-liquid separator 2. During this process, the sixth ball valve 74 and the second electronic expansion ball valve remain closed. The gas-liquid separator 2 supplies refrigerant vapor to the compressor 1 through the gas supply pipe 22. At the same time, the refrigerant liquid flowing out of the economizer through the second outlet pipe 42 flows back into the economizer to evaporate and form refrigerant vapor, which is then supplied to the compressor 1 through the second gas pipe 43.

[0035] The process of absorbing heat from wastewater to heat air (air condenser 6 - water evaporator 8) is as follows: After the compressor 1 discharges, it flows into the air condenser 6 through the first gas pipe 11 and the third branch pipe 61. During this process, the first ball valve 53 and the second ball valve 54 in the condenser switching module remain closed, while the third ball valve 63 and the fourth ball valve 64 remain open. The refrigerant gas is heated by the hot water in the air condenser 6 and then condensed into a liquid. The refrigerant liquid flows sequentially through the fourth branch pipe 62 and the second branch pipe 52 to the economizer. After heat exchange in the economizer, the refrigerant liquid flows into the liquid receiver through the first liquid outlet pipe 41. Inside the receiver 3, the refrigerant liquid flows out through the fourth outlet pipe 31 on the receiver 3, and then flows into the water evaporator 8 through the fifth branch pipe 81 and the first electronic expansion ball valve for evaporation. After passing through the sixth branch pipe 82 and the fifth ball valve 84, it flows to the gas-liquid separator 2. During this process, the sixth ball valve 74 and the second electronic expansion ball valve remain closed. The gas-liquid separator 2 supplies refrigerant vapor to the compressor 1 through the gas supply pipe 22. At the same time, the refrigerant liquid flowing out of the economizer through the second outlet pipe 42 flows back into the economizer to evaporate and form refrigerant vapor, which is then supplied to the compressor 1 through the second gas pipe 43.

[0036] The process of absorbing heat from the air to heat the air (air condenser 6 - air evaporator 7) is as follows: After the compressor 1 discharges, it flows into the air condenser 6 through the first gas pipe 11 and the third branch pipe 61. During this process, the first ball valve 53 and the second ball valve 54 in the condenser switching module remain closed, while the third ball valve 63 and the fourth ball valve 64 remain open. The refrigerant gas heats the hot water in the air condenser 6 and is then condensed into a liquid. The refrigerant liquid flows to the economizer through the second branch pipe 52. After heat exchange in the economizer, the refrigerant liquid flows into the liquid receiver 3 through the first liquid outlet pipe 41. The refrigerant liquid in the unit 3 flows out through the fourth liquid outlet pipe 31, and then flows into the air evaporator 7 through the seventh branch pipe 71 and the second electronic expansion ball valve for evaporation. After passing through the eighth branch pipe 72 and the sixth ball valve 74, it flows to the gas-liquid separator 2. During this process, the sixth ball valve 74 and the second electronic expansion ball valve remain closed. The gas-liquid separator 2 supplies refrigerant vapor to the compressor 1 through the gas supply pipe 22. At the same time, the refrigerant liquid flowing out of the economizer through the second liquid outlet pipe 42 flows back into the economizer to evaporate and form refrigerant vapor, which is then supplied to the compressor 1 through the second gas pipe 43.

[0037] The implementation principle of a multi-condition cooling and heating system according to an embodiment of this application is as follows: During actual production and processing, the compressor 1 discharges exhaust gas through the first gas pipe 11. According to the actual production needs, the water-cooled condenser 5 or the air condenser 6 can be connected between the economizer and the compressor 1 through the condenser switching module. The refrigerant gas is heated to hot water in the air condenser 6 or the water-cooled condenser 5 and becomes refrigerant liquid. The refrigerant liquid is divided into two paths by the economizer. One path flows into the liquid storage tank 3 through the first liquid outlet pipe 41 and flows out through the fourth liquid outlet pipe 31. After evaporation through the water evaporator 8 or the air evaporator 7, it enters the gas-liquid separator 2, is absorbed by the compressor 1, and is compressed and discharged. The other path flows through the second liquid outlet pipe 42 and through the economizer solenoid valve 44 and the economizer electronic expansion valve 45, and then flows to the compressor 1 through the second gas pipe 43. It is absorbed by the compressor 1 and compressed and discharged. Through the condenser switching module and the evaporator switching module, four operating conditions can be provided according to actual production needs: water-cooled condenser 5-water evaporator 8, water-cooled condenser 5-air evaporator 7, air condenser 6-water evaporator 8, and air condenser 6-air evaporator 7. These conditions can respectively achieve the technical effects of absorbing heat from wastewater to heat water, absorbing heat from air to heat water, absorbing heat from wastewater to heat air, and absorbing heat from air to heat air, thus providing four operating conditions for cooling and heating needs in industrial scenarios.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-condition cooling and heating system, characterized in that, It includes a compressor (1), a gas-liquid separator (2), an economizer (4), a liquid receiver (3), a water-cooled condenser (5), an air condenser (6), an air evaporator (7), and a water evaporator (8); The compressor (1) is equipped with a first air pipe (11), the exhaust end of the first air pipe (11) is connected to the air condenser (6) and the water-cooled condenser (5), and a condenser switching module is provided between the economizer (4) and the water-cooled condenser (5) and the air condenser (6). The economizer is connected to a first liquid outlet pipe (41) and a second liquid outlet pipe (42). The first liquid outlet pipe (41) is connected to the liquid reservoir (3). The liquid outlet end of the second liquid outlet pipe (42) is connected to the economizer. The second liquid outlet pipe (42) is equipped with an economizer solenoid valve (44) and an economizer electronic expansion valve (45). The economizer (4) is also connected to a second gas pipe (43). The second gas pipe (43) is connected to the compressor (1). The liquid storage tank (3) is connected to a fourth liquid outlet pipe (31), which is connected to the air evaporator (7) and the water evaporator (8). The gas-liquid separator (2) is connected to a fifth liquid outlet pipe (21), the inlet end of which is connected to the air evaporator (7) and the water evaporator (8). An evaporator switching module is provided between the fifth liquid outlet pipe (21) and the fourth liquid outlet pipe (31). The gas-liquid separator (2) is connected to a gas supply pipe (22), and the outlet of the gas supply pipe (22) is connected to the compressor (1).

2. The multi-condition cooling and heating system according to claim 1, characterized in that, The water-cooled condenser (5) is connected to a first branch pipe (51) and a second branch pipe (52), and the air condenser (6) is connected to a third branch pipe (61) and a fourth branch pipe (62). The air inlet of the first branch pipe (51) and the third branch pipe (61) are connected to the air outlet of the first air pipe (11), the outlet of the second branch pipe (52) is connected to the economizer (4), and the port of the fourth branch pipe (62) is connected to the pipe body of the first branch pipe (51). The condenser switching module includes a first ball valve (53), a second ball valve (54), a third ball valve (63), and a fourth ball valve (64). The first ball valve (53) is installed on the first branch pipe (51), the second ball valve (54) is installed on the second branch pipe (52), the third ball valve (63) is installed on the third branch pipe (61), and the fourth ball valve (64) is installed on the fourth branch pipe (62). The second ball valve (54) is located between the outlet end of the fourth branch pipe (62) and the water-cooled condenser (5).

3. The multi-condition cooling and heating system according to claim 2, characterized in that, The water evaporator (8) is connected to a fifth branch pipe (81) and a sixth branch pipe (82), and the air evaporator (7) is connected to a seventh branch pipe (71) and an eighth branch pipe (72). The inlet ends of the fifth branch pipe (81) and the seventh branch pipe (71) are connected to the outlet end of the fourth liquid outlet pipe (31), the outlet end of the sixth branch pipe (82) is connected to the gas-liquid separator (2), and the outlet end of the eighth branch pipe (72) is connected to the sixth branch pipe (82). The evaporator switching module includes a first electronic expansion valve (83), a second electronic expansion valve (73), a fifth ball valve (84), and a sixth ball valve (74). The first electronic expansion valve (83) is installed on the fifth branch pipe (81), the second electronic expansion valve (73) is installed on the seventh branch pipe (71), the fifth ball valve (84) is installed on the sixth branch pipe (82), and the fifth ball valve (84) is located between the outlet end of the eighth branch pipe (72) and the water evaporator (8). The sixth ball valve (74) is installed on the eighth branch pipe (72).

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