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

Abstract

The invention provides a heat pump air conditioning system, a control method of the heat pump air conditioning system and an air conditioner. The heat pump air conditioning system comprises a compressor, an outdoor heat exchanger, a gas-liquid separator and an indoor heat exchanger, and a communicating pipeline is arranged between a first air suction port of a first compression cylinder and a second air suction port of a second compression cylinder; an air supply pipeline is arranged between the third end of the gas-liquid separator and the second air suction port; a first control valve is arranged on the communicating pipeline, and a second control valve is arranged on the air supplementing pipeline; when the first control valve is in an off state and the second control valve is in an on state, the compressor runs in a 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 a parallel compression mode. The problems that in the prior art, an air conditioner is poor in refrigeration effect in a high-temperature environment, the low-temperature heating capacity in winter is poor, the operation efficiency of a compressor is poor, and consequently the energy efficiency of the air conditioner cannot be guaranteed are solved.

Description

Technical Field

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

[0002] In the high temperature environment of summer, the exhaust temperature and condensing temperature of the compressor of household air conditioners are both high, which limits the increase of the compression frequency of the compressor, resulting in a reduction in the cooling capacity of the air conditioner, seriously affecting the cooling effect of the air conditioner, resulting in poor cooling effect of the air conditioner; in addition, the low-temperature heating capacity in winter is poor, and the operating efficiency of the compressor is poor, resulting in the inability to guarantee the energy efficiency of the air conditioner. Summary of the invention

[0003] The main purpose of the present invention is to provide a heat pump air-conditioning system, a control method for the heat pump air-conditioning system and an air conditioner, so as to solve the problems in the prior art that the air conditioner has poor cooling effect in a high temperature environment, poor heating capacity at low temperatures in winter, and poor operating efficiency of the compressor, resulting in the air conditioner's energy efficiency cannot be guaranteed.

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

[0005] Furthermore, the heat pump air-conditioning system also includes a four-way valve, which has a first port, a second port, a third port, and a fourth port; when the heat pump air-conditioning system is in a refrigeration 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 connected to the second port, the first port is connected to the second end of the outdoor heat exchanger, and the second end of the indoor heat exchanger is connected to the third port; when the compressor operates in a parallel compression mode, the fourth port is connected to the first intake port so that the first intake port absorbs refrigerant from the indoor heat exchanger; when the compressor operates in a parallel compression mode, the first intake port and the second intake port are both connected to the fourth port so that the first intake port and the second intake port absorb refrigerant from the indoor heat exchanger.

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

[0007] Furthermore, in the refrigeration cycle mode, the compressor starts and operates in the parallel compression mode. When the outdoor ambient temperature T3 satisfies T3≥a with the first preset value a, the compressor switches from the parallel compression mode to the parallel compression mode, wherein the value range of the first preset value a is 40~55.

[0008] Further, in the refrigeration cycle mode, the compressor starts and operates in the parallel compression mode, and when the outdoor ambient temperature T3 satisfies T3<a with the first preset value a, and the outdoor heat exchange temperature T2 satisfies T2≥b with the second preset value b, the compressor switches from the parallel compression mode to the parallel compression mode, wherein the value range of the second preset value b is 52~64; or, in the refrigeration cycle mode, the compressor starts and operates in the parallel compression mode, and when the outdoor ambient temperature T3 satisfies T3<a with the first preset value a, and the exhaust temperature T1 satisfies T1≥c with the third preset value c, the compressor switches from the parallel compression mode to the parallel compression mode, wherein the value range of the third preset value c is 78~90.

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

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

[0011] Furthermore, the heat pump air-conditioning system also includes a four-way valve, which has a first port, a second port, a third port, and a fourth port; when the heat pump air-conditioning system is in a 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 connected to the second port, the third port is connected to the second end of the indoor heat exchanger, and the second end of the outdoor heat exchanger is connected to the first port; when the compressor operates in a parallel compression mode, the fourth port is connected to the first intake port so that the first intake port absorbs refrigerant from the outdoor heat exchanger; when the compressor operates in a parallel compression mode, the first intake port and the second intake port are both connected to the fourth port so that the first intake port and the second intake port absorb refrigerant from the outdoor heat exchanger.

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

[0013] Furthermore, in the heating cycle mode, the compressor starts and operates in the parallel compression mode. When the outdoor ambient temperature T3 and the sixth preset value f satisfy T3≥f, the compressor switches from the parallel compression mode to the parallel compression mode, wherein the value range of the sixth preset value f is 20~27.

[0014] Further, in the heating cycle mode, the compressor starts and operates in the parallel compression mode. When the outdoor ambient temperature T3 and the tenth preset value k satisfy T3<k, and the indoor ambient temperature T4 and the seventh preset value g satisfy T4≥g, the compressor switches from the parallel compression mode to the parallel compression mode, wherein the value range of the tenth preset value k is 7-15, and the value range of the seventh preset value g is 25-30; or, in the heating cycle mode, the compressor starts and operates in the parallel compression mode. When the outdoor ambient temperature T3 and the tenth preset value k satisfy T3<k, and the exhaust temperature T1 and the eighth preset value h satisfy T1≥h, the compressor switches from the parallel compression mode to the parallel compression mode, wherein the value range of the tenth preset value k is 7-15, and the value range of the eighth preset value h is 70-82.

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

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

[0017] According to another aspect of the present invention, a control method for a heat pump air-conditioning system is provided, which is used for the above-mentioned heat pump air-conditioning system. The control method includes controlling the first control valve to disconnect and controlling the second control valve to open so that the compressor operates in a parallel compression mode; controlling the first control valve to open and controlling the second control valve to disconnect so that the compressor operates in a parallel compression mode.

[0018] According to another aspect of the present invention, an air conditioner is provided, comprising a heat pump air conditioning system, wherein the heat pump air conditioning system is the above-mentioned heat pump air conditioning system.

[0019] The technical solution of the present invention is applied, by setting the compressor into a structural form with a first compression cylinder and a second compression cylinder, the first compression cylinder has a first exhaust port and a first air intake port, the second compression cylinder has a second exhaust port and a second air intake port, and a connecting pipeline is arranged between the first air intake port and the second air intake port. In addition, the first end of the outdoor heat exchanger is connected with the first end of the gas-liquid separator, the second end of the gas-liquid separator is connected with the first end of the indoor heat exchanger, and an air supply pipeline is arranged between the third end of the gas-liquid separator and the second air intake port; a first control valve is arranged on the connecting pipeline, and a second control valve is arranged on the air supply pipeline.

[0020] Specifically, 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 connected to the second air intake port so that the second air intake port absorbs refrigerant from the gas-liquid separator, and the first air intake 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 air intake 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 an open state and the second control valve is in a disconnected state, the first air intake port and the second air intake port are both connected to the second end of the outdoor heat exchanger or the second end of the indoor heat exchanger, so that the first air intake port and the second air intake port both absorb refrigerant from the outdoor heat exchanger or the indoor heat exchanger, and the compressor operates in a parallel compression mode.

[0022] In the present 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 always maintain high energy efficiency operation as much as possible; in addition, by combining the parallel compressor mode of the compressor and the air supply pressure reduction on the air supply pipeline, the two advantages are superimposed on each other. When the outer ring temperature is high, the air supply pressure reduction can be used, thereby effectively reducing the exhaust temperature and high pressure of the heat pump air-conditioning system, improving the efficiency of the compressor, and increasing the cooling capacity in high temperature environments.

[0023] The compressor provided in the present application is capable of switching between a parallel compression mode and a parallel compression mode. When the ambient temperature is high, it switches to the parallel compression mode, and the first compression cylinder and the second compression cylinder compress the intake air and the supply air respectively, thereby avoiding mixing losses caused by compression of the same cylinder. When the ambient temperature is low, it switches to the parallel compression mode, which can effectively reduce the compression ratio of the first compression cylinder and the second compression cylinder, thereby improving the efficiency of the compressor. Both of them can effectively improve the system energy efficiency and the heating capacity in low temperature environments in winter, and at the same time can reduce the exhaust temperature of the heat pump air-conditioning system, thereby improving the operating reliability of the heat pump air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

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

[0027] The above drawings 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 pipeline; 51. Second control valve;

[0033] 60, four-way valve; 61, first port; 62, second port; 63, third port; 64, fourth port;

[0034] 70, a first temperature sensor; 80, a third temperature sensor; 90, a fourth temperature sensor;

[0035] 100, a first control valve; 200, a first electronic expansion valve; 300, a second electronic expansion valve. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In order to solve the problem that the air conditioner in the prior art has poor cooling effect in high temperature environment, poor heating capacity at low temperature in winter, and poor operating efficiency of the compressor, resulting in the problem that the energy efficiency of the air conditioner cannot be guaranteed, the present invention provides a heat pump air-conditioning system, a control method of the heat pump air-conditioning system and an air conditioner, wherein the control method of the heat pump air-conditioning system is used for the above-mentioned and following heat pump air-conditioning systems, and the control method includes controlling the first control valve 100 to be disconnected and controlling the second control valve 51 to be opened, so that the compressor 10 runs in parallel compression mode; controlling the first control valve 100 to be opened, and controlling the second control valve 51 to be disconnected, so that the compressor 10 runs in parallel compression mode; the air conditioner includes the heat pump air-conditioning system, and the heat pump air-conditioning system is the above-mentioned and following heat pump air-conditioning systems.

[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 air intake port, and the second compression cylinder 12 has a second exhaust port and a second air intake port, and a connecting pipeline is provided between the first air intake port and the second air intake port; wherein 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 an air supply pipeline 50 is provided between the third end of the gas-liquid separator 30 and the second air intake port; wherein a first control valve 100 is provided on the connecting pipeline, and a second control valve 51 is provided on the air supply pipeline 50; when the first control valve 100 is in the disconnected state, the gas supply pipeline 50 is connected to the second air intake port. 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 air intake port, so that the second air intake port absorbs refrigerant from the gas-liquid separator 30, and the first air intake 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 air intake 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 disconnected state, the first air intake port and the second air intake port are both 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 air intake port and the second air intake port are both absorbed from the outdoor heat exchanger 20 or the indoor heat exchanger 40, and the compressor 10 operates in parallel compression mode.

[0039] The technical solution of the present invention is applied, by setting the compressor 10 to have a structure with a first compression cylinder 11 and a second compression cylinder 12, the first compression cylinder 11 has a first exhaust port and a first air intake port, the second compression cylinder 12 has a second exhaust port and a second air intake port, and a connecting pipeline is arranged between the first air intake port and the second air intake port, in addition, the first end of the outdoor heat exchanger 20 is connected with the first end of the gas-liquid separator 30, the second end of the gas-liquid separator 30 is connected with the first end of the indoor heat exchanger 40, and an air supply pipeline 50 is arranged between the third end of the gas-liquid separator 30 and the second air intake port; a first control valve 100 is arranged on the connecting pipeline, and a second control valve 51 is arranged on the air supply pipeline 50.

[0040] Specifically, when the first control valve 100 is in the disconnected 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 air intake port so that the second air intake port absorbs refrigerant from the gas-liquid separator 30, and the first air intake 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 air intake 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 an open state and the second control valve 51 is in a disconnected state, the first air intake port and the second air intake port are both 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 air intake port and the second air intake 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.

[0042] In the present 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 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 always maintain high energy efficiency operation as much as possible; in addition, by combining the parallel compressor mode of the compressor 10 and the air supply pressure reduction on the air supply pipeline 50, the two advantages are superimposed on each other. When the outer ring temperature is high, the air supply pressure reduction can be used, thereby effectively reducing the exhaust temperature and high pressure of the heat pump air-conditioning system, improving the efficiency of the compressor 10, and increasing the cooling capacity in a high temperature environment.

[0043] The compressor 10 provided in the present application is capable of switching between a parallel compression mode and a parallel compression mode. When the ambient temperature is high, it switches to the parallel compression mode, and the first compression cylinder 11 and the second compression cylinder 12 compress the intake air and the replenishing air respectively, thereby avoiding mixing losses caused by compression of the same cylinder; when the ambient temperature is low, it switches to the parallel compression mode, which can effectively reduce the compression ratio of the first compression cylinder 11 and the second compression cylinder 12, thereby improving the efficiency of the compressor; both can effectively improve the system energy efficiency and the heating capacity in low temperature environments in winter, and at the same time can reduce the exhaust temperature of the heat pump air-conditioning system, thereby improving the operating 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 a refrigeration cycle mode, the first port 61 and the second port 62 are connected, and the third port 63 and the fourth port 64 are 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 operates in a parallel compression mode, the fourth port 64 is connected to the first air intake port, so that the first air intake port absorbs refrigerant from the indoor heat exchanger 40; when the compressor 10 operates in a parallel compression mode, the first air intake port and the second air intake port are both connected to the fourth port 64, so that the first air intake port and the second air intake port absorb refrigerant from the indoor heat exchanger 40. In this way, the setting of the four-way valve 60 serves to switch the refrigeration cycle mode and the heating cycle mode of the heat pump air-conditioning system. In addition, in the refrigeration cycle mode, the compressor 10 starts operating in the parallel compression mode. When the compressor 10 is in the parallel compression mode, the second air intake port absorbs the refrigerant from the gas-liquid separator 30, which can effectively reduce the exhaust temperature and condensation temperature of the compressor 10, thereby enabling the heat pump air-conditioning system to operate at a high frequency in a high temperature environment, thereby increasing the cooling capacity.

[0045] like Figure 1 As shown, 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 second temperature sensor 21 is arranged on the outdoor heat exchanger 20, and 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 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 ambient temperature T3.

[0046] like Figure 1 As shown, in the refrigeration cycle mode, the compressor 10 starts and operates in the parallel compression mode. When the outdoor ambient temperature T3 satisfies T3≥a with the first preset value a, the compressor 10 switches from the parallel compression mode to the parallel compression mode, wherein the value range of the first preset value a is 40-55.

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

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

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

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

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

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

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

[0054] like Figure 1 As shown, a first electronic expansion valve 200 is provided on the pipeline between the third temperature sensor 80 and the gas-liquid separator 30. Thus, the provision of the first electronic expansion valve 200 is conducive to reducing the pressure of the refrigerant and regulating the circulation flow of the refrigerant.

[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 a 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, the third port 63 is connected to the second end of the indoor heat exchanger 40, and the second end of the outdoor heat exchanger 20 is connected to the first port 61; when the compressor 10 operates in a parallel compression mode, the fourth port 64 is connected to the first air intake port, so that the first air intake port absorbs refrigerant from the outdoor heat exchanger 20; when the compressor 10 operates in a parallel compression mode, the first air intake port and the second air intake port are both connected to the fourth port 64, so that the first air intake port and the second air intake port absorb refrigerant from the outdoor heat exchanger 20. In this way, the setting of the four-way valve 60 plays a role in switching the refrigeration 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 operating in the parallel compression mode. When the compressor 10 is in the parallel compression mode, the second air intake port absorbs the refrigerant from the gas-liquid separator 30, thereby realizing that the heat pump air-conditioning system can operate at a high frequency in a low temperature environment, thereby increasing the heating capacity.

[0056] like Figure 2 As shown, 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 ambient 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 ambient temperature T4.

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

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

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

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

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

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

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

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

[0065] like Figure 2 As shown, a second electronic expansion valve 300 is provided on the pipeline between the fourth temperature sensor 90 and the gas-liquid separator 30. Thus, the provision of the second electronic expansion valve 300 is conducive to reducing the pressure of the refrigerant and regulating the circulation flow of the refrigerant.

[0066] Beneficial effects of this application:

[0067] 1. By turning the valve on and off, 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. Through the control method, the control system switches to the parallel compression mode when the ambient temperature is high, which can reduce the mixing loss caused by compression of the same cylinder, and can reduce the system exhaust temperature and power, and improve the system capacity and energy efficiency.

[0069] 3. Through the control method, the control system switches to the 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 the system capacity and energy efficiency.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0071] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

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

[0073] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

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

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat pump air conditioning system, characterized in that: include: A compressor (10), the compressor (10) comprising a first compression cylinder (11) and a second compression cylinder (12), the first compression cylinder (11) comprising a first exhaust port and a first intake port, the second compression cylinder (12) comprising a second exhaust port and a second intake port, and a connecting pipeline is provided between the first intake port and the second intake 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 an air supply pipeline (50) is provided between a third end of the gas-liquid separator (30) and the second air intake port; Wherein, a first control valve (100) is provided on the connecting pipeline, and a second control valve (51) is provided on the air supply pipeline (50); When the first control valve (100) is in an open state and the second control valve (51) is in an open state, the third end of the gas-liquid separator (30) is connected to the second air intake port so that the second air intake port absorbs refrigerant from the gas-liquid separator (30), and the first air intake 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 air intake 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 an open state, the first air intake port and the second air intake port are both 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 air intake port and the second air intake port absorb refrigerant from the outdoor heat exchanger (20) or the indoor heat exchanger (40), and the compressor (10) operates in a parallel compression mode.

2. The heat pump air conditioning system according to claim 1, characterized in that: The heat pump air conditioning system also includes: A four-way valve (60), wherein the 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 a refrigeration cycle mode, the first port (61) and the second port (62) are connected, and the third port (63) and the fourth port (64) are 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) operates in the parallel compression mode, the fourth port (64) is connected to the first air intake port so that the first air intake port absorbs refrigerant from the indoor heat exchanger (40); When the compressor (10) operates in the parallel compression mode, the first air intake port and the second air intake port are both connected to the fourth port (64), so that the first air intake port and the second air intake port both absorb refrigerant from the indoor heat exchanger (40).

3. The heat pump air conditioning system according to claim 2, characterized in that: A first temperature sensor (70) is provided 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); The outdoor heat exchanger (20) is provided with a second temperature sensor (21), and 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 provided 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 ambient temperature T3.

4. The heat pump air conditioning system according to claim 3, characterized in that: In the refrigeration cycle mode, the compressor (10) starts to operate in the parallel compression mode. When the outdoor ambient temperature T3 satisfies T3≥a with a first preset value a, the compressor (10) switches from the parallel compression mode to the parallel compression mode, wherein the first preset value a ranges from 40 to 55.

5. The heat pump air conditioning system according to claim 3, characterized in that: In the refrigeration cycle mode, the compressor (10) starts to operate in the parallel compression mode, and when the outdoor ambient temperature T3 satisfies T3<a with a first preset value a, and the outdoor heat exchange temperature T2 satisfies T2≥b with a second preset value b, the compressor (10) switches from the parallel compression mode to the parallel compression mode, wherein the value range of the second preset value b is 52 to 64; or, In the refrigeration cycle mode, the compressor (10) starts to operate in the parallel compression mode. When the outdoor ambient temperature T3 satisfies T3<a with a first preset value a, and the exhaust temperature T1 satisfies T1≥c with a third preset value c, the compressor (10) switches from the parallel compression mode to the parallel compression mode, wherein the third preset value c has a value range of 78 to 90.

6. The heat pump air conditioning system according to claim 4 or 5, characterized in that: In the refrigeration cycle mode, and the compressor (10) operates in the parallel compression mode, when the outdoor heat exchange temperature T2 satisfies T2<d with a fourth preset value d, the compressor (10) switches from the parallel compression mode to the parallel compression mode, wherein the fourth preset value d has a value range of 36 to 40; or In the refrigeration cycle mode, and the compressor (10) operates in the parallel compression mode, when the exhaust temperature T1 satisfies T1<e with a fifth preset value e, the compressor (10) switches from the parallel compression mode to the parallel compression mode, wherein the fifth preset value e has a value range of 60 to 68.

7. The heat pump air conditioning system according to claim 3, characterized in that: A first electronic expansion valve (200) is provided on the pipeline between the third temperature sensor (80) and the gas-liquid separator (30).

8. The heat pump air conditioning system according to claim 1, characterized in that: The heat pump air conditioning system also includes: A four-way valve (60), wherein the 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 a 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), the third port (63) is connected to the second end of the indoor heat exchanger (40), and the second end of the outdoor heat exchanger (20) is connected to the first port (61); When the compressor (10) operates in the parallel compression mode, the fourth port (64) is connected to the first air intake port so that the first air intake port absorbs refrigerant from the outdoor heat exchanger (20); When the compressor (10) operates in the parallel compression mode, the first air intake port and the second air intake port are both connected to the fourth port (64), so that the first air intake port and the second air intake port both absorb refrigerant from the outdoor heat exchanger (20).

9. The heat pump air conditioning system according to claim 8, characterized in that: A first temperature sensor (70) is provided 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 provided 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 ambient temperature T3; A fourth temperature sensor (90) is provided 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 ambient temperature T4.

10. The heat pump air conditioning system according to claim 9, characterized in that: In the heating cycle mode, the compressor (10) starts to operate in the parallel compression mode, and when the outdoor ambient temperature T3 satisfies T3≥f with a sixth preset value f, the compressor (10) switches from the parallel compression mode to the parallel compression mode, wherein the sixth preset value f has a value range of 20 to 27.

11. The heat pump air conditioning system according to claim 9, characterized in that: In the heating cycle mode, the compressor (10) starts to operate in the parallel compression mode, and when the outdoor ambient temperature T3 satisfies T3<k with a tenth preset value k, and the indoor ambient temperature T4 satisfies T4≥g with a seventh preset value g, the compressor (10) switches from the parallel compression mode to the parallel compression mode, wherein the tenth preset value k has a value range of 7 to 15, and the seventh preset value g has a value range of 25 to 30; or, In the heating cycle mode, the compressor (10) starts to operate in the parallel compression mode. When the outdoor ambient temperature T3 satisfies T3<k with a tenth preset value k, and the exhaust temperature T1 satisfies T1≥h with an eighth preset value h, the compressor (10) switches from the parallel compression mode to the parallel compression mode, wherein the tenth preset value k has a value range of 7 to 15, and the eighth preset value h has a value range of 70 to 82.

12. The heat pump air conditioning system according to claim 10 or 11, characterized in that: In the heating cycle mode, and the compressor (10) operates in the parallel compression mode, when the exhaust temperature T1 satisfies T1<i with a ninth preset value i, the compressor (10) switches from the parallel compression mode to the parallel compression mode, wherein the ninth preset value i has a value range of 55 to 60.

13. The heat pump air conditioning system according to claim 9, characterized in that: A second electronic expansion valve (300) is provided on the pipeline between the fourth temperature sensor (90) and the gas-liquid separator (30).

14. A control method for a heat pump air conditioning system, characterized in that: For the heat pump air conditioning system according to any one of claims 1 to 13, the control method comprises: Controlling the first control valve (100) to be disconnected, and controlling the second control valve (51) to be opened, so that the compressor (10) operates in a parallel compression mode; The first control valve (100) is controlled to be opened, and the second control valve (51) is controlled to be opened, so that the compressor (10) operates in a parallel compression mode.

15. An air conditioner, characterized in that: It comprises a heat pump air conditioning system, and the heat pump air conditioning system is the heat pump air conditioning system according to any one of claims 1 to 13.

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