Heat pump air conditioning system, control method of heat pump air conditioning system and air conditioner

Abstract

This invention provides a heat pump air conditioning system, a control method for the heat pump air conditioning system, and an air conditioner. The heat pump air conditioning system includes a compressor, an outdoor heat exchanger, a gas-liquid separator, and an indoor heat exchanger. A connecting pipe is provided between the first intake port of the first compressor cylinder and the second intake port of the second compressor cylinder. A make-up gas pipe is provided between the third end of the gas-liquid separator and the second intake port. A first control valve is provided on the connecting pipe, and a second control valve is provided on the make-up gas pipe. When the first control valve is in the open state and the second control valve is in the open state, the compressor operates in parallel compression mode; when the first control valve is in the open state and the second control valve is in the open state, the compressor operates in parallel compression mode. This invention solves the problems of poor cooling effect in high-temperature environments, poor heating effect in low-temperature winter environments, and poor compressor operating efficiency in existing air conditioners, which lead to unreliable energy efficiency of the air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning equipment, in particular to a heat pump air conditioning system, a control method of the heat pump air conditioning system and an air conditioner. BACKGROUND

[0002] In a high-temperature environment in summer, the discharge temperature and the condensing temperature of the compressor of the household air conditioner are relatively high, which limits the improvement of the compression frequency of the compressor, causes the refrigerating capacity of the air conditioner to decrease, and seriously affects the refrigerating effect of the air conditioner, resulting in poor refrigerating effect of the air conditioner; in addition, the heating capacity is poor in winter, and the operation efficiency of the compressor is poor, resulting in inability to guarantee the energy efficiency of the air conditioner. SUMMARY

[0003] The main purpose of the present application is to provide a heat pump air conditioning system, a control method of the heat pump air conditioning system and an air conditioner, so as to solve the problem that the air conditioner in the prior art has poor refrigerating effect in a high-temperature environment, poor heating capacity in winter, poor operation efficiency of the compressor, and inability to guarantee the energy efficiency of the air conditioner.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a heat pump air conditioning system is provided, comprising a compressor, an outdoor heat exchanger, a gas-liquid separator, and an indoor heat exchanger, the compressor has a first compression cylinder and a second compression cylinder, the first compression cylinder has a first discharge port and a first suction port, the second compression cylinder has a second discharge port and a second suction port, and a communication pipeline is arranged between the first suction port and the second suction port; wherein the first end of the outdoor heat exchanger is in communication with the first end of the gas-liquid separator, the second end of the gas-liquid separator is in communication with the first end of the indoor heat exchanger, and a gas supplement pipeline is arranged between the third end of the gas-liquid separator and the second suction port; wherein a first control valve is arranged on the communication pipeline, and a second control valve is arranged on the gas supplement pipeline; when the first control valve is in a disconnected state and the second control valve is in an open state, the third end of the gas-liquid separator is in communication with the second suction port, so that the second suction port absorbs refrigerant from the gas-liquid separator, and the first suction port is in communication with the second end of the outdoor heat exchanger or the second end of the indoor heat exchanger, so that the first suction port absorbs refrigerant from the outdoor heat exchanger or the indoor heat exchanger, and the compressor operates in a parallel compression mode; when the first control valve is in an open state and the second control valve is in a disconnected state, the first suction port and the second suction port are both in communication with the second end of the outdoor heat exchanger or the second end of the indoor heat exchanger, so that the first suction port and the second suction port both absorb refrigerant from the outdoor heat exchanger or the indoor heat exchanger, and the compressor operates in a parallel compression mode.

[0005] Further, the heat pump air conditioning system further comprises a four-way valve, the four-way valve having a first port, a second port, a third port and a fourth port; when the heat pump air conditioning system is in the cooling cycle mode, the first port and the second port are connected, and the third port and the fourth port are connected, the first exhaust port and the second exhaust port are both communicated with the second port, the first port is communicated with the second end of the outdoor heat exchanger, and the second end of the indoor heat exchanger is communicated with the third port; when the compressor operates in the parallel compression mode, the fourth port is communicated with the first suction port, so that the first suction port absorbs refrigerant from the indoor heat exchanger; when the compressor operates in the parallel compression mode, the first suction port and the second suction port are both communicated with the fourth port, so that the first suction port and the second suction port both absorb refrigerant from the indoor heat exchanger.

[0006] Further, a first temperature sensor is arranged on the pipeline between the first exhaust port or the second exhaust port and the second port, the first temperature sensor being used to detect the exhaust temperature T1 of the compressor; a second temperature sensor is arranged on the outdoor heat exchanger, the second temperature sensor being used to detect the outdoor heat exchange temperature T2 of the outdoor heat exchanger; and a third temperature sensor is arranged on the pipeline between the outdoor heat exchanger and the gas-liquid separator, the third temperature sensor being used to detect the outdoor environment temperature T3.

[0007] Further, in the cooling cycle mode, the compressor is started to operate in the parallel compression mode, when the outdoor environment temperature T3 and the first preset value a satisfy T3≥a, the compressor is switched from the parallel compression mode to the parallel compression mode, wherein the first preset value a is in the range of 40-55.

[0008] Further, in the cooling cycle mode, the compressor is started to operate in the parallel compression mode, when the outdoor environment temperature T3 and the first preset value a satisfy T3<a, and the outdoor heat exchange temperature T2 and the second preset value b satisfy T2≥b, the compressor is switched from the parallel compression mode to the parallel compression mode, wherein the second preset value b is in the range of 52-64; or, in the cooling cycle mode, the compressor is started to operate in the parallel compression mode, when the outdoor environment temperature T3 and the first preset value a satisfy T3<a, and the exhaust temperature T1 and the third preset value c satisfy T1≥c, the compressor is switched from the parallel compression mode to the parallel compression mode, wherein the third preset value c is in the range of 78-90.

[0009] Further, in the refrigeration cycle mode, and the compressor runs in parallel compression mode, when the outdoor heat exchange temperature T2 and the fourth preset value d between meet T2 < d, the compressor is switched from parallel compression mode to parallel compression mode, wherein the fourth preset value d is in the range of 36-40; or, in the refrigeration cycle mode, and the compressor runs in parallel compression mode, when the exhaust temperature T1 and the fifth preset value e between meet T1 < e, the compressor is switched from parallel compression mode to parallel compression mode, wherein the fifth preset value e is in the range of 60-68.

[0010] Further, a first electronic expansion valve is arranged on the pipeline between the third temperature sensor and the gas-liquid separator.

[0011] Further, the heat pump air conditioning system further comprises a four-way valve, the four-way valve has a first port, a second port, a third port and a fourth port; when the heat pump air conditioning system is in the heating cycle mode, the first port and the fourth port are connected, and the second port and the third port are connected, the first exhaust port and the second exhaust port are both communicated with the second port, the third port is communicated with the second end of the indoor heat exchanger, and the second end of the outdoor heat exchanger is communicated with the first port; when the compressor runs in parallel compression mode, the fourth port is communicated with the first suction port, so that the first suction port absorbs refrigerant from the outdoor heat exchanger; when the compressor runs in parallel compression mode, the first suction port and the second suction port are both communicated with the fourth port, so that the first suction port and the second suction port both absorb refrigerant from the outdoor heat exchanger.

[0012] Further, a first temperature sensor is arranged on the pipeline between the first exhaust port or the second exhaust port and the second port, the first temperature sensor is used to detect the exhaust temperature T1 of the compressor; a third temperature sensor is arranged on the pipeline between the outdoor heat exchanger and the gas-liquid separator, the third temperature sensor is used to detect the outdoor environment temperature T3; a fourth temperature sensor is arranged on the pipeline between the indoor heat exchanger and the gas-liquid separator, the fourth temperature sensor is used to detect the indoor environment temperature T4.

[0013] Further, in the heating cycle mode, the compressor starts to run in parallel compression mode, when the outdoor environment temperature T3 and the sixth preset value f between meet T3 ≥ f, the compressor is switched from parallel compression mode to parallel compression mode, wherein the sixth preset value f is in the range of 20-27.

[0014] Further, in the heating cycle mode, the compressor is started to operate in the parallel compression mode, when the outdoor environment temperature T3 satisfies T3 < k between the tenth preset value k, and the indoor environment temperature T4 satisfies T4 >= g between the seventh preset value g, the compressor is switched from the parallel compression mode to the parallel compression mode, wherein the tenth preset value k is in the range of 7-15, the seventh preset value g is in the range of 25-30; or, in the heating cycle mode, the compressor is started to operate in the parallel compression mode, when the outdoor environment temperature T3 satisfies T3 < k between the tenth preset value k, and the exhaust temperature T1 satisfies T1 >= h between the eighth preset value h, the compressor is switched from the parallel compression mode to the parallel compression mode, wherein the tenth preset value k is in the range of 7-15, the eighth preset value h is in the range of 70-82.

[0015] Further, in the heating cycle mode, and the compressor operates in the parallel compression mode, when the exhaust temperature T1 satisfies T1 < i between the ninth preset value i, the compressor is switched from the parallel compression mode to the parallel compression mode, wherein the ninth preset value i is in the range of 55-60.

[0016] Further, a second electronic expansion valve is arranged on the pipeline between the fourth temperature sensor and the gas-liquid separator.

[0017] According to another aspect of the present application, a control method of a heat pump air conditioning system is provided, for the heat pump air conditioning system described above, the control method comprising controlling the first control valve to be closed, and controlling the second control valve to be opened, so that the compressor operates in the parallel compression mode; controlling the first control valve to be opened, and controlling the second control valve to be closed, so that the compressor operates in the parallel compression mode.

[0018] According to another aspect of the present application, an air conditioner is provided, comprising a heat pump air conditioning system, which is the heat pump air conditioning system described above.

[0019] The technical scheme of the present application sets the compressor to have a structure with a first compression cylinder and a second compression cylinder, the first compression cylinder has a first exhaust port and a first suction port, the second compression cylinder has a second exhaust port and a second suction port, and a communication pipeline is arranged between the first suction port and the second suction port, in addition, the first end of the outdoor heat exchanger is communicated with the first end of the gas-liquid separator, the second end of the gas-liquid separator is communicated with the first end of the indoor heat exchanger, and a gas supplement pipeline is arranged between the third end of the gas-liquid separator and the second suction port; a first control valve is arranged on the communication pipeline, and a second control valve is arranged on the gas supplement pipeline.

[0020] Specifically, when the first control valve is in the off state and the second control valve is in the open state, the third end of the gas-liquid separator is connected to the second suction port so that the second suction port absorbs refrigerant from the gas-liquid separator, and the first suction port is connected to the second end of the outdoor heat exchanger or the second end of the indoor heat exchanger so that the first suction port absorbs refrigerant from the outdoor heat exchanger or the indoor heat exchanger, and the compressor operates in parallel compression mode.

[0021] Furthermore, when the first control valve is in the open state and the second control valve is in the open state, both the first and second intake ports are connected to the second end of the outdoor heat exchanger or the second end of the indoor heat exchanger, so that both the first and second intake ports absorb refrigerant from the outdoor heat exchanger or the indoor heat exchanger, and the compressor operates in parallel compression mode.

[0022] In this application, by switching the working states of the first control valve and the second control valve, the parallel compression mode and the parallel compression mode of the compressor can be switched according to the working state of the heat pump air conditioning system, so that the heat pump air conditioning system can maintain a high energy efficiency operation as much as possible. In addition, by combining the parallel compressor mode of the compressor with the gas injection pressure reduction on the gas injection pipeline, the two advantages are superimposed. When the outer ring temperature is high, gas injection pressure reduction can be used to effectively reduce the exhaust temperature and high pressure of the heat pump air conditioning system, improve the compressor efficiency, and increase the cooling capacity in high temperature environments.

[0023] The compressor provided in this application can switch between parallel compression mode and parallel compression mode. When the ambient temperature is high, it switches to parallel compression mode, where the first and second compression cylinders compress the intake and replenishment gas respectively, avoiding mixing losses caused by compression in the same cylinder. When the ambient temperature is low, it switches to parallel compression mode, which can effectively reduce the compression ratio of the first and second compression cylinders and improve the compressor efficiency. Both modes can effectively improve the system energy efficiency and heating capacity in low-temperature winter environments, while also reducing the exhaust temperature of the heat pump air conditioning system and improving the operational reliability of the heat pump air conditioning system. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 A schematic diagram of a heat pump air conditioning system in cooling mode according to an optional embodiment of the present invention is shown;

[0026] Figure 2 A schematic diagram of a heat pump air conditioning system in heating mode according to an optional embodiment of the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 1. Outdoor unit; 2. Indoor unit;

[0029] 10. Compressor; 11. First compression cylinder; 12. Second compression cylinder;

[0030] 20. Outdoor heat exchanger; 21. Second temperature sensor;

[0031] 30. Gas-liquid separator; 40. Indoor heat exchanger;

[0032] 50. Air supply line; 51. Second control valve;

[0033] 60. Four-way valve; 61. First port; 62. Second port; 63. Third port; 64. Fourth port;

[0034] 70. First temperature sensor; 80. Third temperature sensor; 90. Fourth temperature sensor;

[0035] 100, First control valve; 200, First electronic expansion valve; 300, Second electronic expansion valve. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] To address the problems of poor cooling performance in high-temperature environments, poor heating performance in low-temperature winters, and poor compressor operating efficiency in existing air conditioners, which lead to unreliable energy efficiency, this invention provides a heat pump air conditioning system, a control method for the heat pump air conditioning system, and an air conditioner. The control method for the heat pump air conditioning system, used in the aforementioned heat pump air conditioning system, includes controlling a first control valve 100 to disconnect and a second control valve 51 to open, so that the compressor 10 operates in parallel compression mode; and controlling the first control valve 100 to open and the second control valve 51 to disconnect, so that the compressor 10 operates in parallel compression mode. The air conditioner includes the heat pump air conditioning system described above.

[0038] like Figure 1 and Figure 2As shown, the heat pump air conditioning system includes a compressor 10, an outdoor heat exchanger 20, a gas-liquid separator 30, and an indoor heat exchanger 40. The compressor 10 has a first compression cylinder 11 and a second compression cylinder 12. The first compression cylinder 11 has a first exhaust port and a first intake port, and the second compression cylinder 12 has a second exhaust port and a second intake port. A connecting pipe is provided between the first intake port and the second intake port. The first end of the outdoor heat exchanger 20 is connected to the first end of the gas-liquid separator 30, the second end of the gas-liquid separator 30 is connected to the first end of the indoor heat exchanger 40, and a make-up gas pipe 50 is provided between the third end of the gas-liquid separator 30 and the second intake port. A first control valve 100 is provided on the connecting pipe, and a second control valve 51 is provided on the make-up gas pipe 50. When the first control valve 100 is in the open position... When the first control valve 100 is in the open state and the second control valve 51 is in the open state, the third end of the gas-liquid separator 30 is connected to the second suction port, so that the second suction port absorbs refrigerant from the gas-liquid separator 30, and the first suction port is connected to the second end of the outdoor heat exchanger 20 or the second end of the indoor heat exchanger 40, so that the first suction port absorbs refrigerant from the outdoor heat exchanger 20 or the indoor heat exchanger 40, and the compressor 10 operates in parallel compression mode; when the first control valve 100 is in the open state and the second control valve 51 is in the open state, both the first suction port and the second suction port are connected to the second end of the outdoor heat exchanger 20 or the second end of the indoor heat exchanger 40, so that both the first suction port and the second suction port absorb refrigerant from the outdoor heat exchanger 20 or the indoor heat exchanger 40, and the compressor 10 operates in parallel compression mode.

[0039] By applying the technical solution of the present invention, the compressor 10 is configured to have a first compression cylinder 11 and a second compression cylinder 12. The first compression cylinder 11 has a first exhaust port and a first intake port, and the second compression cylinder 12 has a second exhaust port and a second intake port. A connecting pipe is provided between the first intake port and the second intake port. In addition, the first end of the outdoor heat exchanger 20 is connected to the first end of the gas-liquid separator 30, the second end of the gas-liquid separator 30 is connected to the first end of the indoor heat exchanger 40, and a make-up air pipe 50 is provided between the third end of the gas-liquid separator 30 and the second intake port. A first control valve 100 is provided on the connecting pipe, and a second control valve 51 is provided on the make-up air pipe 50.

[0040] Specifically, when the first control valve 100 is in the off state and the second control valve 51 is in the open state, the third end of the gas-liquid separator 30 is connected to the second suction port so that the second suction port absorbs refrigerant from the gas-liquid separator 30, and the first suction port is connected to the second end of the outdoor heat exchanger 20 or the second end of the indoor heat exchanger 40 so that the first suction port absorbs refrigerant from the outdoor heat exchanger 20 or the indoor heat exchanger 40, and the compressor 10 operates in parallel compression mode.

[0041] Furthermore, when the first control valve 100 is in the open state and the second control valve 51 is in the open state, both the first and second intake ports are connected to the second end of the outdoor heat exchanger 20 or the second end of the indoor heat exchanger 40, so that both the first and second intake ports absorb refrigerant from the outdoor heat exchanger 20 or the indoor heat exchanger 40, and the compressor 10 operates in parallel compression mode.

[0042] In this application, by switching the working states of the first control valve 100 and the second control valve 51, the parallel compression mode and the parallel-connected compression mode of the compressor 10 can be switched according to the working state of the heat pump air conditioning system, so that the heat pump air conditioning system can maintain a high energy efficiency operation as much as possible. In addition, by combining the parallel compressor mode of the compressor 10 with the gas injection pressure reduction on the gas injection pipeline 50, the two advantages are superimposed. When the outer ring temperature is high, gas injection pressure reduction can be used to effectively reduce the exhaust temperature and high pressure of the heat pump air conditioning system, improve the efficiency of the compressor 10, and increase the cooling capacity in high-temperature environments.

[0043] The compressor 10 provided in this application can switch between parallel compression mode and parallel compression mode. When the ambient temperature is high, it switches to parallel compression mode, where the first compression cylinder 11 and the second compression cylinder 12 compress the intake and replenishment gas respectively, avoiding mixing losses caused by compression in the same cylinder. When the ambient temperature is low, it switches to parallel compression mode, which can effectively reduce the compression ratio of the first compression cylinder 11 and the second compression cylinder 12 and improve the efficiency of the compressor. Both modes can effectively improve the system energy efficiency and heating capacity in low-temperature winter environments, while also reducing the exhaust temperature of the heat pump air conditioning system and improving the operational reliability of the heat pump air conditioning system.

[0044] like Figure 1As shown, the heat pump air conditioning system also includes a four-way valve 60, which has a first port 61, a second port 62, a third port 63, and a fourth port 64. When the heat pump air conditioning system is in the cooling cycle mode, the first port 61 and the second port 62 are connected, and the third port 63 and the fourth port 64 are also connected. The first exhaust port and the second exhaust port are both connected to the second port 62. The first port 61 is connected to the second end of the outdoor heat exchanger 20, and the second end of the indoor heat exchanger 40 is connected to the third port 63. When the compressor 10 is running in parallel compression mode, the fourth port 64 is connected to the first suction port so that the first suction port absorbs refrigerant from the indoor heat exchanger 40. When the compressor 10 is running in parallel compression mode, both the first suction port and the second suction port are connected to the fourth port 64 so that both the first suction port and the second suction port absorb refrigerant from the indoor heat exchanger 40. In this way, the four-way valve 60 serves to switch between the cooling cycle mode and the heating cycle mode of the heat pump air conditioning system. In addition, in the cooling cycle mode, the compressor 10 starts to operate in parallel compression mode. When the compressor 10 is in parallel compression mode, the second suction port absorbs refrigerant from the gas-liquid separator 30, which can effectively reduce the exhaust temperature and condensing temperature of the compressor 10. This enables the compressor 10 to operate at high frequency in high-temperature environments, thereby increasing the cooling capacity.

[0045] like Figure 1 As shown, a first temperature sensor 70 is installed on the pipeline between the first exhaust port or the second exhaust port and the second port 62. The first temperature sensor 70 is used to detect the exhaust temperature T1 of the compressor 10. A second temperature sensor 21 is installed on the outdoor heat exchanger 20. The second temperature sensor 21 is used to detect the outdoor heat exchange temperature T2 of the outdoor heat exchanger 20. A third temperature sensor 80 is installed on the pipeline between the outdoor heat exchanger 20 and the gas-liquid separator 30. The third temperature sensor 80 is used to detect the outdoor ambient temperature T3.

[0046] like Figure 1 As shown, in the refrigeration cycle mode, the compressor 10 starts and runs in parallel compression mode. When the outdoor ambient temperature T3 and the first preset value a satisfy T3≥a, the compressor 10 switches from parallel compression mode to parallel compression mode. The first preset value a ranges from 40 to 55.

[0047] Optionally, the first preset value a can be 40, 43, 45, 48, 52, or 55.

[0048] like Figure 1As shown, in the refrigeration cycle mode, the compressor 10 starts and operates in parallel compression mode. When the outdoor ambient temperature T3 satisfies T3 < a and the first preset value a, and the outdoor heat exchange temperature T2 satisfies T2 ≥ b, the compressor 10 switches from parallel compression mode to parallel compression mode. The value of the second preset value b ranges from 52 to 64. Alternatively, in the refrigeration cycle mode, the compressor 10 starts and operates in parallel compression mode. When the outdoor ambient temperature T3 satisfies T3 < a and the first preset value a, and the exhaust temperature T1 satisfies T1 ≥ c, the compressor 10 switches from parallel compression mode to parallel compression mode. The value of the third preset value c ranges from 78 to 90.

[0049] Optionally, the second preset value b can be 52, 55, 58, 60, or 64.

[0050] Optionally, the third preset value c can be 78, 80, 85, 88, or 90.

[0051] like Figure 1 As shown, in the refrigeration cycle mode, and when the compressor 10 is operating in parallel compression mode, when the outdoor heat exchange temperature T2 and the fourth preset value d satisfy T2 < d, the compressor 10 switches from parallel compression mode to parallel compression mode, wherein the value of the fourth preset value d ranges from 36 to 40; or, in the refrigeration cycle mode, and when the compressor 10 is operating in parallel compression mode, when the exhaust temperature T1 and the fifth preset value e satisfy T1 < e, the compressor 10 switches from parallel compression mode to parallel compression mode, wherein the value of the fifth preset value e ranges from 60 to 68.

[0052] Optionally, the fourth preset value d can be 40, 38, or 36.

[0053] Optionally, the fifth preset value e can be 60, 65, or 68.

[0054] like Figure 1 As shown, a first electronic expansion valve 200 is installed on the pipeline between the third temperature sensor 80 and the gas-liquid separator 30. This first electronic expansion valve 200 helps to reduce the refrigerant pressure and regulate the refrigerant circulation flow rate.

[0055] like Figure 2As shown, the heat pump air conditioning system also includes a four-way valve 60, which has a first port 61, a second port 62, a third port 63, and a fourth port 64. When the heat pump air conditioning system is in heating cycle mode, the first port 61 and the fourth port 64 are connected, and the second port 62 and the third port 63 are connected. The first exhaust port and the second exhaust port are both connected to the second port 62, and the third port 63 is connected to the second end of the indoor heat exchanger 40. The second end of the outdoor heat exchanger 20 is connected to the first port 61. When the compressor 10 is running in parallel compression mode, the fourth port 64 is connected to the first suction port so that the first suction port absorbs refrigerant from the outdoor heat exchanger 20. When the compressor 10 is running in parallel compression mode, the first suction port and the second suction port are both connected to the fourth port 64 so that both the first suction port and the second suction port absorb refrigerant from the outdoor heat exchanger 20. In this way, the four-way valve 60 is set to switch between the cooling cycle mode and the heating cycle mode of the heat pump air conditioning system. In addition, in the heating cycle mode, the compressor 10 starts to operate in parallel compression mode. When the compressor 10 is in parallel compression mode, the second suction port absorbs refrigerant from the gas-liquid separator 30, thereby enabling the compressor 10 to operate at high frequency and increase heating capacity in the heat pump air conditioning system in low temperature environment.

[0056] like Figure 2 As shown, a first temperature sensor 70 is installed on the pipeline between the first exhaust port or the second exhaust port and the second port 62. The first temperature sensor 70 is used to detect the exhaust temperature T1 of the compressor 10. A third temperature sensor 80 is installed on the pipeline between the outdoor heat exchanger 20 and the gas-liquid separator 30. The third temperature sensor 80 is used to detect the outdoor ambient temperature T3. A fourth temperature sensor 90 is installed on the pipeline between the indoor heat exchanger 40 and the gas-liquid separator 30. The fourth temperature sensor 90 is used to detect the indoor ambient temperature T4.

[0057] like Figure 2 As shown, in the heating cycle mode, the compressor 10 starts and runs in parallel compression mode. When the outdoor ambient temperature T3 and the sixth preset value f satisfy T3≥f, the compressor 10 switches from parallel compression mode to parallel compression mode. The value range of the sixth preset value f is 20 to 27.

[0058] Optionally, the sixth preset value f can be 20, 24, or 27.

[0059] like Figure 2As shown, in the heating cycle mode, the compressor 10 starts and operates in parallel compression mode. When the outdoor ambient temperature T3 satisfies T3 < k and the tenth preset value k, and the indoor ambient temperature T4 satisfies T4 ≥ g, the compressor 10 switches from parallel compression mode to parallel compression mode. The value range of the tenth preset value k is 7 to 15, and the value range of the seventh preset value g is 25 to 30. Alternatively, in the heating cycle mode, the compressor 10 starts and operates in parallel compression mode. When the outdoor ambient temperature T3 satisfies T3 < k and the tenth preset value k, and the exhaust temperature T1 satisfies T1 ≥ h, the compressor 10 switches from parallel compression mode to parallel compression mode. The value range of the tenth preset value k is 7 to 15, and the value range of the eighth preset value h is 70 to 82.

[0060] Optionally, the seventh preset value g can be 25, 28, or 30.

[0061] Optionally, the eighth preset value h can be 70, 76, or 82.

[0062] Optionally, the tenth preset value k can be 15, 10, or 7.

[0063] like Figure 2 As shown, in the heating cycle mode, and the compressor 10 is running in parallel compression mode, when the exhaust temperature T1 and the ninth preset value i satisfy T1 < i, the compressor 10 switches from parallel compression mode to parallel compression mode, wherein the value range of the ninth preset value i is 55 to 60.

[0064] Optionally, the ninth preset value i can be 60, 58, or 55.

[0065] like Figure 2 As shown, a second electronic expansion valve 300 is installed on the pipeline between the fourth temperature sensor 90 and the gas-liquid separator 30. This second electronic expansion valve 300 helps to reduce the refrigerant pressure and regulate the refrigerant circulation flow rate.

[0066] The beneficial effects of this application are:

[0067] 1. By opening and closing the valve, the parallel compression mode and the parallel compression mode can be switched to each other, so that the heat pump air conditioning system can always maintain high energy efficiency operation.

[0068] 2. By using control methods, the control system switches to parallel compression mode when the ambient temperature is high, which can reduce the mixing loss caused by compression in the same cylinder, and can also reduce the system exhaust temperature and power, thereby improving system capacity and energy efficiency.

[0069] 3. By using control methods, the control system switches to parallel compression mode when the ambient temperature is low, which can effectively reduce the compression ratio of each cylinder, improve the efficiency of the compressor, and reduce the system exhaust temperature and power, thereby improving system capacity and energy efficiency.

[0070] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0071] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0072] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0073] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0074] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat pump air conditioning system, characterised in that, The heat pump air conditioning system comprises: a compressor (10) having a first compression cylinder (11) and a second compression cylinder (12), the first compression cylinder (11) having a first exhaust port and a first suction port, the second compression cylinder (12) having a second exhaust port and a second suction port, and a communication pipeline being arranged between the first suction port and the second suction port; an outdoor heat exchanger (20), a gas-liquid separator (30), and an indoor heat exchanger (40), wherein a first end of the outdoor heat exchanger (20) is in communication with a first end of the gas-liquid separator (30), a second end of the gas-liquid separator (30) is in communication with a first end of the indoor heat exchanger (40), and a gas supplement pipeline (50) is arranged between a third end of the gas-liquid separator (30) and the second suction port; wherein a first control valve (100) is arranged on the communication pipeline, and a second control valve (51) is arranged on the gas supplement pipeline (50); when the first control valve (100) is in a closed state and the second control valve (51) is in an open state, the third end of the gas-liquid separator (30) is in communication with the second suction port, so that the second suction port absorbs refrigerant from the gas-liquid separator (30), and the first suction port is in communication with the second end of the outdoor heat exchanger (20) or the second end of the indoor heat exchanger (40), so that the first suction port absorbs refrigerant from the outdoor heat exchanger (20) or the indoor heat exchanger (40), and the compressor (10) operates in a parallel compression mode; when the first control valve (100) is in an open state and the second control valve (51) is in a closed state, the first suction port and the second suction port are both in communication with the second end of the outdoor heat exchanger (20) or the second end of the indoor heat exchanger (40), so that the first suction port and the second suction port both absorb refrigerant from the outdoor heat exchanger (20) or the indoor heat exchanger (40), and the compressor (10) operates in a parallel compression mode; The heat pump air conditioning system further comprises: a four-way valve (60) having a first port (61), a second port (62), a third port (63), and a fourth port (64); when the heat pump air conditioning system is in a refrigeration cycle mode, the first port (61) and the second port (62) are in conduction, and the third port (63) and the fourth port (64) are in conduction, the first exhaust port and the second exhaust port are both in communication with the second port (62), the first port (61) is in communication with the second end of the outdoor heat exchanger (20), and the second end of the indoor heat exchanger (40) is in communication with the third port (63); when the compressor (10) operates in the parallel compression mode, the fourth port (64) is in communication with the first suction port, so that the first suction port absorbs refrigerant from the indoor heat exchanger (40); When the compressor (10) operates the parallel compression mode, the first suction port and the second suction port are both communicated with the fourth port (64) so that the first suction port and the second suction port are both supplied with refrigerant absorbed by the indoor heat exchanger (40); A third temperature sensor (80) is arranged on a pipeline between the outdoor heat exchanger (20) and the gas-liquid separator (30), and the third temperature sensor (80) is used to detect an outdoor environment temperature T3; A first electronic expansion valve (200) is arranged on a pipeline between the third temperature sensor (80) and the gas-liquid separator (30).

2. The heat pump air conditioning system according to claim 1, wherein, A first temperature sensor (70) is arranged on a pipeline between the first exhaust port or the second exhaust port and the second port (62), and the first temperature sensor (70) is used to detect an exhaust temperature T1 of the compressor (10); A second temperature sensor (21) is arranged on the outdoor heat exchanger (20), and the second temperature sensor (21) is used to detect an outdoor heat exchange temperature T2 of the outdoor heat exchanger (20).

3. The heat pump air conditioning system according to claim 2, wherein, In the refrigeration cycle mode, the compressor (10) is started to operate in the parallel compression mode, and when T3≥a is met between the outdoor environment temperature T3 and a first preset value a, the compressor (10) is switched from the parallel compression mode to the series compression mode, and the first preset value a is in a range of 40-55.

4. The heat pump air conditioning system according to claim 2, wherein, In the refrigeration cycle mode, the compressor (10) is started to operate in the parallel compression mode, and when T3 In the refrigeration cycle mode, the compressor (10) is started to operate in the parallel compression mode, and when T3 5. The heat pump air conditioning system according to claim 3 or 4, wherein, In the refrigeration cycle mode and when the compressor (10) operates the parallel compression mode, when T2 In the refrigeration cycle mode, and the compressor (10) runs the parallel compression mode, when the exhaust temperature T1 and the fifth preset value e between meet T1 < e, the compressor (10) is switched from the parallel compression mode to the parallel compression mode, wherein the fifth preset value e is in the range of 60~68.

6. The heat pump air conditioning system of claim 1, wherein, The heat pump air conditioning system further comprises: A four-way valve (60) has a first port (61), a second port (62), a third port (63), and a fourth port (64); When the heat pump air conditioning system is in the heating cycle mode, the first port (61) and the fourth port (64) are connected, and the second port (62) and the third port (63) are connected, the first exhaust port and the second exhaust port are both communicated with the second port (62), the third port (63) is communicated with the second end of the indoor heat exchanger (40), and the second end of the outdoor heat exchanger (20) is communicated with the first port (61); When the compressor (10) runs the parallel compression mode, the fourth port (64) is communicated with the first suction port, so that the first suction port absorbs refrigerant from the outdoor heat exchanger (20); When the compressor (10) runs the parallel compression mode, the first suction port and the second suction port are both communicated with the fourth port (64), so that the first suction port and the second suction port both absorb refrigerant from the outdoor heat exchanger (20).

7. The heat pump air conditioning system according to claim 6, wherein, A first temperature sensor (70) is arranged on the pipeline between the first exhaust port or the second exhaust port and the second port (62), and the first temperature sensor (70) is used to detect the exhaust temperature T1 of the compressor (10); A third temperature sensor (80) is arranged on the pipeline between the outdoor heat exchanger (20) and the gas-liquid separator (30), and the third temperature sensor (80) is used to detect the outdoor environment temperature T3; A fourth temperature sensor (90) is arranged on the pipeline between the indoor heat exchanger (40) and the gas-liquid separator (30), and the fourth temperature sensor (90) is used to detect the indoor environment temperature T4.

8. The heat pump air conditioning system according to claim 7, wherein, In the heating cycle mode, the compressor (10) starts to run in the parallel compression mode, and when the outdoor environment temperature T3 and the sixth preset value f between meet T3 ≥ f, the compressor (10) is switched from the parallel compression mode to the parallel compression mode, wherein the sixth preset value f is in the range of 20~27.

9. The heat pump air conditioning system according to claim 7, wherein, In the heating cycle mode, the compressor (10) starts to operate in the parallel compression mode, when the outdoor environment temperature T3 meets T3 < k, and the indoor environment temperature T4 meets T4 ≥ g, the compressor (10) is switched from the parallel compression mode to the series compression mode, wherein the tenth preset value k is in the range of 7-15, and the seventh preset value g is in the range of 25-30; or, In the heating cycle mode, the compressor (10) starts to operate in the parallel compression mode, when the outdoor environment temperature T3 meets T3 < k, and the indoor environment temperature T4 meets T4 ≥ g, the compressor (10) is switched from the parallel compression mode to the series compression mode, wherein the tenth preset value k is in the range of 7-15, and the seventh preset value g is in the range of 25-30; or, 10. The heat pump air conditioning system according to claim 8 or 9, characterized in that, In the heating cycle mode, and the compressor (10) operates in the parallel compression mode, when the exhaust temperature T1 meets T1 < i, the compressor (10) is switched from the parallel compression mode to the series compression mode, wherein the ninth preset value i is in the range of 55-60.

11. The heat pump air conditioning system of claim 7, wherein, A second electronic expansion valve (300) is arranged on the pipeline between the fourth temperature sensor (90) and the gas-liquid separator (30).

12. A control method of a heat pump air conditioning system, characterized by, The control method for the heat pump air conditioning system according to any one of claims 1-11, comprising: controlling the first control valve (100) to be closed, and controlling the second control valve (51) to be opened, so that the compressor (10) operates in the parallel compression mode; controlling the first control valve (100) to be opened, and controlling the second control valve (51) to be closed, so that the compressor (10) operates in the series compression mode.

13. An air conditioner characterized by comprising: The heat pump air conditioning system according to any one of claims 1-11.

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