Air conditioning system and control method thereof

Abstract

The invention relates to the technical field of air conditioners, particularly provides an air conditioning system and a control method thereof, and aims to solve the problem that the failure rate of the air conditioning system is high due to the fact that an existing refrigerant pump is short in service life. In order to achieve the purpose, the air conditioning system comprises an air suspension type compressor, an evaporator, a condenser, a first air supply tank and a second air supply tank. First control valves are arranged between the evaporator and the first gas supply tank and between the condenser and the first gas supply tank; second control valves are arranged between the evaporator and the condenser and the second gas supply tank; the first gas supply tank and the second gas supply tank are both connected to a gas supply port of the compressor, and a third control valve is arranged between the first gas supply tank and the compressor and between the second gas supply tank and the compressor. When one gas supply tank supplies gas, the other gas supply tank is supplemented with refrigerants; the refrigerant is supplemented in a gravity mode or automatically supplemented to the air supply tank through the refrigerant with high pressure in the condenser, the refrigerant can be supplemented to the air supply tank without a refrigerant pump, the failure rate is reduced, and safe and stable operation of the compressor is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and specifically provides an air conditioning system and a control method thereof. Background Art

[0002] With the development of the economy and society, air conditioners have become essential electrical appliances in households and office places. An air conditioning system is equipped with a compressor. In order to reduce the energy consumption and noise of the compressor, a magnetic levitation compressor has emerged; the magnetic levitation compressor requires a dedicated air supply pipeline to supply air to the magnetic levitation bearing so that the magnetic levitation bearing can levitate.

[0003] The working principle of magnetic levitation is to supply air to the air floating bearing through an air supply system to achieve the purpose of bearing levitation. Bearing levitation is a prerequisite for the operation of the magnetic levitation compressor, and the force for bearing levitation comes from the pressure difference between the pressure of the air supply tank and the pressure of the compressor chamber. Since the pressure in the air supply tank is the highest pressure in the entire system in most cases, when the refrigerant in the air supply tank is consumed, the conventional design is to set a refrigerant pump to pump the low-pressure refrigerant into the air supply tank. However, this design has two problems: ① As a high-speed moving part, the reliability of the refrigerant pump during long-term operation is difficult to guarantee; ② The refrigerant pump has high efficiency in pumping liquid, but has low efficiency in pumping gas, and pumping gas also causes relatively large damage to the refrigerant pump. In this way, it is necessary to ensure that the refrigerant in front of the refrigerant pump is in a liquid state, but the situation where the refrigerant in front of the refrigerant pump is a gas cannot be excluded.

[0004] Therefore, there is an urgent need for an air conditioning system and a control method thereof to solve the above technical problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problem that when using a refrigerant pump to transport refrigerant to a magnetic levitation compressor in the prior art, the service life of the refrigerant pump is low, resulting in a relatively high failure rate of the air conditioning system.

[0006] In a first aspect, the present invention provides an air conditioning system, which includes a magnetic levitation compressor, an evaporator, a condenser, a first air supply tank, and a second air supply tank;

[0007] Both the evaporator and the condenser are connected to the compressor;

[0008] Both the evaporator and the condenser are connected to the first air supply tank, and a first control valve is provided between the evaporator and the condenser and the first air supply tank;

[0009] Both the evaporator and the condenser are connected to the second air supply tank, and a second control valve is provided between the evaporator and the condenser and the second air supply tank;

[0010] The first air supply tank and the second air supply tank are both connected to the air supply port of the compressor and are used to supply air to the air suspension bearing of the compressor. A third control valve is provided between the first air supply tank, the second air supply tank and the compressor.

[0011] In the specific implementation manner of the above air-conditioning system, the top of the first air supply tank is connected to the evaporator, and a first pressure relief valve is provided between the first air supply tank and the evaporator. The first pressure relief valve is used to control whether the first air supply tank relieves pressure; and / or

[0012] The top of the second air supply tank is connected to the evaporator, and a second pressure relief valve is provided between the second air supply tank and the evaporator. The second pressure relief valve is used to control whether the second air supply tank relieves pressure.

[0013] In the specific implementation manner of the above air-conditioning system, heaters are provided in both the first air supply tank and the second air supply tank for heating the refrigerant.

[0014] In a second aspect, the present invention provides a control method for an air-conditioning system as described above. The control method includes:

[0015] Determine the air supply tank for supplying air to the compressor according to the state of the air-conditioning system and the liquid levels of the first air supply tank and the second air supply tank.

[0016] In the specific implementation manner of the control method of the above air-conditioning system, "determine the air supply tank for supplying air to the compressor according to the state of the air-conditioning system and the liquid levels of the first air supply tank and the second air supply tank" includes:

[0017] When the air-conditioning system is in a shutdown state, the first control valve, the second control valve and the third control valve are all in a closed state.

[0018] In the specific implementation manner of the control method of the above air-conditioning system, "determine the air supply tank for supplying air to the compressor according to the state of the air-conditioning system and the liquid levels of the first air supply tank and the second air supply tank" includes:

[0019] When the air-conditioning system is in the startup preparation stage, determine the opening degrees of the first control valve and the second control valve and the air supply tank for supplying air to the compressor according to the liquid levels of the first air supply tank and the second air supply tank. In the specific implementation manner of the control method of the above air-conditioning system, "determine the opening degrees of the first control valve and the second control valve and the air supply tank for supplying air to the compressor according to the liquid levels of the first air supply tank and the second air supply tank" includes:

[0020] If the liquid levels of both the first gas supply tank and the second gas supply tank are greater than the first preset liquid level, the first gas supply tank supplies gas to the compressor;

[0021] If the liquid level of one of the first gas supply tank and the second gas supply tank is greater than the first preset liquid level, the gas supply tank with the liquid level greater than the first preset liquid level supplies gas to the compressor and replenishes refrigerant for the other gas supply tank;

[0022] If the liquid levels of both the first gas supply tank and the second gas supply tank are not greater than the first preset liquid level, refrigerant is replenished for both the first gas supply tank and the second gas supply tank simultaneously, and the gas supply tank whose liquid level reaches the first preset liquid level first supplies gas to the compressor and continues to replenish refrigerant for the other gas supply tank;

[0023] When replenishing refrigerant for the first gas supply tank, both first control valves are opened;

[0024] When replenishing refrigerant for the second gas supply tank, both second control valves are opened.

[0025] In the specific implementation manner of the control method of the above air-conditioning system, "determine the gas supply tank that supplies gas to the compressor according to the state of the air-conditioning system and the liquid levels of the first gas supply tank and the second gas supply tank" includes:

[0026] When the air-conditioning system is in an operating state, according to the liquid level of the currently gas-supplying tank, the liquid levels and pressures of the non-gas-supplying tanks, determine the opening degrees of the pressure relief valves and control valves corresponding to the non-gas-supplying tanks.

[0027] In the specific implementation manner of the control method of the above air-conditioning system, "determine the opening degrees of the pressure relief valves and control valves corresponding to the non-gas-supplying tanks according to the liquid level of the currently gas-supplying tank, the liquid levels and pressures of the non-gas-supplying tanks" includes:

[0028] If the liquid level of the currently gas-supplying tank drops to the third preset liquid level, then according to the liquid levels and pressures of the non-gas-supplying tanks, determine the opening degrees of the pressure relief valves and control valves corresponding to the non-gas-supplying tanks;

[0029] The third preset liquid level is greater than the first preset liquid level.

[0030] In the specific implementation manner of the control method of the above air-conditioning system, "determine the opening degrees of the pressure relief valves and control valves corresponding to the non-gas-supplying tanks according to the liquid levels and pressures of the non-gas-supplying tanks" includes:

[0031] If the liquid level of the non-gas-supplying tank is greater than the first preset liquid level, after the liquid level of the currently gas-supplying tank drops to the second preset liquid level, the non-gas-supplying tank starts to be heated;

[0032] The third preset liquid level is greater than the second preset liquid level, and the second preset liquid level is greater than the first preset liquid level.

[0033] In the specific implementation of the control method of the above air conditioning system, "determining the opening degrees of the pressure relief valve and the control valve corresponding to the non-gas-supplied gas storage tank according to the liquid level and pressure of the non-gas-supplied gas storage tank" includes:

[0034] If the liquid level of the non-gas-supplied gas storage tank is not greater than the first preset liquid level and the pressure of the non-gas-supplied gas storage tank is less than the pressure of the condenser, open the control valve on the condenser side to supplement refrigerant to the non-gas-supplied gas storage tank.

[0035] In the specific implementation of the control method of the above air conditioning system, "determining the opening degrees of the pressure relief valve and the control valve corresponding to the non-gas-supplied gas storage tank according to the liquid level and pressure of the non-gas-supplied gas storage tank" includes:

[0036] If the liquid level of the non-gas-supplied gas storage tank is not greater than the first preset liquid level and the pressure of the non-gas-supplied gas storage tank is not less than the pressure of the condenser, relieve the pressure of the non-gas-supplied gas storage tank, and after the pressure relief, open the control valve on the condenser side to supplement refrigerant to the non-gas-supplied gas storage tank.

[0037] In the case of adopting the above technical solution, the air-conditioning system of the present invention includes an air suspension compressor, an evaporator, a condenser, a first air supply tank, and a second air supply tank; the evaporator and the condenser are both connected to the compressor; the evaporator and the condenser are both connected to the first air supply tank, and first control valves are provided between the evaporator and the condenser and the first air supply tank; the evaporator and the condenser are both connected to the second air supply tank, and second control valves are provided between the evaporator and the condenser and the second air supply tank; the first air supply tank and the second air supply tank are both connected to the air supply port of the compressor for supplying air to the air suspension bearing of the compressor, and a third control valve is provided between the first air supply tank, the second air supply tank, and the compressor. The top of the first air supply tank is connected to the evaporator, and a first pressure relief valve is provided between the first air supply tank and the evaporator, and the first pressure relief valve is used to control whether the first air supply tank is depressurized; the top of the second air supply tank is connected to the evaporator, and a second pressure relief valve is provided between the second air supply tank and the evaporator, and the second pressure relief valve is used to control whether the second air supply tank is depressurized. The two air supply tanks supply air to the compressor in turn by switching, and when one of them is supplying air, the other is replenished with refrigerant; specifically, the refrigerant is replenished by gravity or the refrigerant with a higher pressure in the condenser automatically replenishes the air supply tank, so that the air supply tank can supply air to the compressor normally. In addition, through the control method of the air-conditioning system, it can be ensured that at least one of the two air supply tanks has enough refrigerant to supply air to the compressor at each stage, ensuring that the air-conditioning system can operate continuously and stably. The air-conditioning system of the present invention can replenish the refrigerant to the air supply tank without a refrigerant pump, greatly reducing the failure rate of the air-conditioning system and ensuring that the compressor can operate safely and smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, in which:

[0039] Figure 1 is a schematic structural diagram of the air-conditioning system provided by the present invention;

[0040] Figure 2 is a flowchart of the control method of the air-conditioning system provided by the present invention.

[0041] LIST OF REFERENCE NUMERALS:

[0042] 1. Compressor; 2. Condenser; 3. Evaporator; 4. First air supply tank; 41. First electric heater; 42. First liquid level gauge; 43. First pressure detection element; 5. Second air supply tank; 51. Second electric heater; 52. Second liquid level gauge; 53. Second pressure detection element; 61. First sub-control valve; 62. Second sub-control valve; 63. Third sub-control valve; 64. Fourth sub-control valve; 65. Fifth sub-control valve; 66. Sixth sub-control valve; 71. First pressure relief valve; 72. Second pressure relief valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0044] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] In order to solve the problem that when using a refrigerant pump to deliver refrigerant to an air suspension compressor in the prior art, the service life of the refrigerant pump is low, resulting in a relatively high failure rate of the air conditioning system.

[0047] As Figure 1 shown, this embodiment discloses an air conditioning system, which includes an air suspension compressor 1, an evaporator 3, a condenser 2, a first air supply tank 4 and a second air supply tank 5.

[0048] Both the evaporator 3 and the condenser 2 are connected to the compressor 1; specifically, the exhaust port of the compressor 1 is connected to the condenser 2, the condenser 2 is connected to the evaporator 3 through a throttling element, and the evaporator 3 is connected to the suction port of the compressor 1.

[0049] Both the evaporator 3 and the condenser 2 are connected to the first air supply tank 4, and first control valves are provided between the evaporator 3 and the condenser 2 and the first air supply tank 4; specifically, the first control valve includes a first sub-control valve 61 and a second sub-control valve 62; a first sub-control valve 61 is provided between the evaporator 3 and the first air supply tank 4, and a second sub-control valve 62 is provided between the condenser 2 and the first air supply tank 4. Among them, both the first sub-control valve 61 and the second sub-control valve 62 are solenoid valves or electric ball valves.

[0050] In the startup preparation stage, the first sub-control valve 61 and the second sub-control valve 62 can be opened to replenish refrigerant for the first gas supply tank 4; in the normal operation stage, the second sub-control valve 62 can be opened to replenish refrigerant for the first gas supply tank 4.

[0051] The evaporator 3 and the condenser 2 are both connected to the second gas supply tank 5, and second control valves are provided between the evaporator 3 and the condenser 2 and the second gas supply tank 5; specifically, the second control valves include a third sub-control valve 63 and a fourth sub-control valve 64; a third sub-control valve 63 is provided between the evaporator 3 and the second gas supply tank 5, and a fourth sub-control valve 64 is provided between the condenser 2 and the second gas supply tank 5. Among them, both the third sub-control valve 63 and the fourth sub-control valve 64 are solenoid valves or electric ball valves.

[0052] The heights of the first gas supply tank 4 and the second gas supply tank 5 are both lower than the heights of the evaporator 3 and the condenser 2. In the startup preparation stage, under the action of gravity, the liquid refrigerant in the evaporator 3 and the condenser 2 can flow into the first gas supply tank 4 and the second gas supply tank 5.

[0053] In the startup preparation stage, the third sub-control valve 63 and the fourth sub-control valve 64 can be opened to replenish refrigerant for the second gas supply tank 5; in the normal operation stage, the fourth sub-control valve 64 can be opened to replenish refrigerant for the second gas supply tank 5.

[0054] The exhaust ports of the first gas supply tank 4 and the second gas supply tank 5 are both connected to the air supply port of the compressor 1 for supplying air to the air suspension bearing of the compressor 1. A third control valve is provided between the first gas supply tank 4, the second gas supply tank 5 and the compressor 1. Among them, the third control valve includes a fifth sub-control valve 65 and a sixth sub-control valve 66; a fifth sub-control valve 65 is provided between the first gas supply tank 4 and the compressor 1, and a sixth sub-control valve 66 is provided between the second gas supply tank 5 and the compressor 1. Among them, both the fifth sub-control valve 65 and the sixth sub-control valve 66 are solenoid valves or electric ball valves. When the first gas supply tank 4 needs to supply air to the compressor 1, the fifth sub-control valve 65 is opened. When the second gas supply tank 5 needs to supply air to the compressor 1, the sixth sub-control valve 66 is opened.

[0055] The top of the first gas supply tank 4 is connected to the evaporator 3, and a first pressure relief valve 71 is provided between the first gas supply tank 4 and the evaporator 3. The first pressure relief valve 71 is used to control whether the first gas supply tank 4 relieves pressure; among them, the first pressure relief valve 71 is specifically a solenoid valve, an electric ball valve or an electronic expansion valve, and is preferably an electronic expansion valve in this embodiment.

[0056] The top of the second gas supply tank 5 is connected to the evaporator 3, and a second pressure relief valve 72 is provided between the second gas supply tank 5 and the evaporator 3. The second pressure relief valve 72 is used to control whether the second gas supply tank 5 relieves pressure. Among them, the second pressure relief valve 72 is specifically a solenoid valve, an electric ball valve or an electronic expansion valve, and is preferably an electronic expansion valve in this embodiment.

[0057] Both a first gas supply tank 4 and a second gas supply tank 5 are provided with heaters for heating the refrigerant. Specifically, a first electric heater 41 is provided in the first gas supply tank 4, and a second electric heater 51 is provided in the second gas supply tank 5. In addition, a first liquid level gauge 42 is provided in the first gas supply tank 4 for detecting the liquid level of the refrigerant in the first gas supply tank 4; a second liquid level gauge 52 is provided in the second gas supply tank 5 for detecting the liquid level of the refrigerant in the second gas supply tank 5. A first pressure detection member 43 is provided in the first gas supply tank 4 for detecting the pressure in the first gas supply tank 4; a second pressure detection member 53 is provided in the second gas supply tank 5 for detecting the pressure in the second gas supply tank 5; wherein, both the first pressure detection member 43 and the second pressure detection member 53 are pressure sensors.

[0058] This air conditioning system further includes a control module, which is configured to be able to execute the control method of this air conditioning system. This control method includes the following main steps:

[0059] Determine the gas supply tank for supplying gas to the compressor 1 according to the state of the air conditioning system and the liquid levels of the first gas supply tank 4 and the second gas supply tank 5.

[0060] Among the first gas supply tank 4 and the second gas supply tank 5, only one supplies gas to the compressor 1 at the same moment.

[0061] Among them, "determine the gas supply tank for supplying gas to the compressor 1 according to the state of the air conditioning system and the liquid levels of the first gas supply tank 4 and the second gas supply tank 5" includes:

[0062] When the air conditioning system is in the shutdown state, the first control valve, the second control valve, the third control valve and the pressure relief valve are also all in the closed state. Specifically, after shutting down for a period of time, all the valves corresponding to the first gas supply tank 4 and the second gas supply tank 5 are closed, so that the refrigerant in the first gas supply tank 4 and the second gas supply tank 5 cannot leak outwards, and the liquid levels in the first gas supply tank 4 and the second gas supply tank 5 are kept at a relatively high state, which is convenient for quick startup when starting up next time.

[0063] "Determine the gas supply tank for supplying gas to the compressor 1 according to the state of the air conditioning system and the liquid levels of the first gas supply tank 4 and the second gas supply tank 5" also includes:

[0064] When the air conditioning system is in the startup preparation stage, determine the opening degrees of the first control valve and the second control valve and the gas supply tank for supplying gas to the compressor 1 according to the liquid levels of the first gas supply tank 4 and the second gas supply tank 5. In the startup preparation stage, both the evaporator 3 and the condenser 2 can supplement the refrigerant to the first gas supply tank 4 and the second gas supply tank 5.

[0065] Among them, "determining the opening degrees of the first control valve and the second control valve and the gas supply tank for supplying gas to the compressor 1 according to the liquid levels of the first gas supply tank 4 and the second gas supply tank 5" includes:

[0066] If the liquid levels of both the first gas supply tank 4 and the second gas supply tank 5 are greater than the first preset liquid level, the first gas supply tank 4 supplies gas to the compressor 1 first; that is, the fifth sub-control valve 65 is opened to enable the first gas supply tank 4 to supply gas to the compressor 1.

[0067] If the liquid level of one of the first gas supply tank 4 and the second gas supply tank 5 is greater than the first preset liquid level, the gas supply tank with the liquid level greater than the first preset liquid level supplies gas to the compressor 1 and replenishes refrigerant for the other gas supply tank; if the liquid level of the first gas supply tank 4 is greater than the first preset liquid level and the liquid level of the second gas supply tank 5 is not greater than the first preset liquid level; at this time, the first gas supply tank 4 replenishes gas for the compressor 1, then the fifth sub-control valve 65 is opened; and the second control valve of the second gas supply tank 5 is opened to enable the evaporator 3 and the condenser 2 to replenish refrigerant for the second gas supply tank 5 simultaneously. If the liquid level of the second gas supply tank 5 is greater than the first preset liquid level and the liquid level of the first gas supply tank 4 is not greater than the first preset liquid level; at this time, the second gas supply tank 5 replenishes gas for the compressor 1, then the sixth sub-control valve 66 is opened; and the second control valve of the first gas supply tank 4 is opened to enable the evaporator 3 and the condenser 2 to replenish refrigerant for the first gas supply tank 4 simultaneously. During the process of replenishing refrigerant, when the liquid level of the refrigerant in the gas supply tank to be supplied reaches the fourth preset liquid level, refrigerant is no longer replenished for the gas supply tank. Wherein the fourth preset liquid level is greater than the first preset liquid level.

[0068] If the liquid levels of both the first gas supply tank 4 and the second gas supply tank 5 are not greater than the first preset liquid level, refrigerant is replenished for both the first gas supply tank 4 and the second gas supply tank 5 simultaneously, and the gas supply tank whose liquid level reaches the first preset liquid level first supplies gas to the compressor 1 and continues to replenish refrigerant for the other gas supply tank (during the process of replenishing refrigerant, when the liquid level of the refrigerant in the gas supply tank that has not been supplied reaches the fourth preset liquid level, refrigerant is no longer replenished for the gas supply tank. Wherein the fourth preset liquid level is greater than the first preset liquid level); specifically, both the first control valve and the second control valve are opened to enable the evaporator 3 and the condenser 2 to replenish refrigerant for both the first gas supply tank 4 and the second gas supply tank 5 simultaneously. During the process of replenishing refrigerant, when the liquid level of the refrigerant in the gas supply tank that has not been supplied reaches the fourth preset liquid level, refrigerant is no longer replenished for the gas supply tank. Wherein the fourth preset liquid level is greater than the first preset liquid level.

[0069] Among them, "determining the gas supply tank for supplying gas to the compressor 1 according to the state of the air conditioning system and the liquid levels of the first gas supply tank 4 and the second gas supply tank 5" further includes:

[0070] When the air conditioning system is in an operating state, according to the liquid level, liquid level and pressure of the gas supply tank that is currently supplying gas and the gas supply tank that has not been supplied, determine the opening degrees of the pressure relief valve and the control valve corresponding to the gas supply tank that has not been supplied.

[0071] When the air conditioning system is in operation, the pressure in the evaporator 3 is relatively low and cannot replenish refrigerant to the gas supply tank. However, the pressure in the condenser 2 is relatively high and it can replenish refrigerant to the gas supply tank. Therefore, during the normal operation stage of the air conditioning system, only the second sub-control valve 62 and the fourth sub-control valve 64 are opened to replenish refrigerant to the gas supply tank.

[0072] Among them, "determining the opening degrees of the pressure relief valve and the control valve corresponding to the non-gas-supplying gas supply tank according to the liquid level of the currently gas-supplying gas supply tank and the liquid levels and pressures of the non-gas-supplying gas supply tanks" specifically includes:

[0073] If the liquid level of the currently gas-supplying gas supply tank drops to the third preset liquid level, then according to the liquid levels and pressures of the non-gas-supplying gas supply tanks, determine the opening degrees of the pressure relief valve and the control valve corresponding to the non-gas-supplying gas supply tank; among them, the third preset liquid level is greater than the first preset liquid level; moreover, the fourth preset liquid level is greater than the third preset liquid level.

[0074] Among them, "determining the opening degrees of the pressure relief valve and the control valve corresponding to the non-gas-supplying gas supply tank according to the liquid levels and pressures of the non-gas-supplying gas supply tanks" includes:

[0075] If the liquid level of the non-gas-supplying gas supply tank is greater than the first preset liquid level, after the liquid level of the currently gas-supplying gas supply tank drops to the second preset liquid level, the non-gas-supplying gas supply tank starts to be heated; if the currently gas-supplying tank is the first gas supply tank 4, after the liquid level of the first gas supply tank 4 drops to the second preset liquid level, the second gas supply tank 5 turns on the electric heating to increase the refrigerant pressure in the second gas supply tank 5 to prepare for opening the second gas supply tank 5; after the liquid level of the first gas supply tank drops below the first preset liquid level, close the fifth sub-control valve and open the sixth sub-control valve to make the second gas supply tank 5 supply gas to the compressor. If the currently gas-supplying tank is the second gas supply tank 5, after the liquid level of the second gas supply tank 5 drops to the second preset liquid level, the first gas supply tank 4 turns on the electric heating to increase the refrigerant pressure in the first gas supply tank 4 to prepare for opening the first gas supply tank 4; after the liquid level of the second gas supply tank drops below the first preset liquid level, close the sixth sub-control valve and open the fifth sub-control valve to make the first gas supply tank 5 supply gas to the compressor. Among them, the third preset liquid level is greater than the second preset liquid level, and the second preset liquid level is greater than the first preset liquid level.

[0076] Among them, "determining the opening degrees of the pressure relief valve and the control valve corresponding to the non-gas-supplying gas supply tank according to the liquid levels and pressures of the non-gas-supplying gas supply tanks" also includes:

[0077] If the liquid level of the non-gas-supplying gas supply tank is not greater than the first preset liquid level and the pressure of the non-gas-supplying gas supply tank is less than the pressure of the condenser 2, then open the control valve on the condenser 2 side to replenish refrigerant to the non-gas-supplying gas supply tank.

[0078] If the current gas supply is from the first gas supply tank 4, after the liquid level of the first gas supply tank 4 drops to the second preset liquid level; when the liquid level of the second gas supply tank 5 is not greater than the first preset liquid level and the pressure of the second gas supply tank 5 is less than the pressure of the condenser 2, open the fourth sub-control valve 64 to enable the condenser 2 to supplement refrigerant to the second gas supply tank 5; during the refrigerant supplementation process, stop until the pressure in the second gas supply tank 5 reaches the pressure of the condenser 2 and the liquid level in the second gas supply tank 5 reaches the third liquid level, or stop when the liquid level reaches the fourth preset liquid level, or stop after the liquid level in the first gas supply tank 5 drops to the first preset liquid level. If during the air supplementation process, the pressure in the second gas supply tank 5 reaches the pressure of the condenser 2 but the liquid level in the second gas supply tank 5 does not reach the third preset liquid level, then open the second pressure relief valve 72 to reduce the pressure in the second gas supply tank 5 to enable the condenser 2 to continue supplementing refrigerant to the second gas supply tank 5. After the liquid level of the first gas supply tank 4 drops to the first preset liquid level, close the fifth sub-control valve and open the sixth sub-control valve to enable the second gas supply tank to supply gas to the compressor.

[0079] If the current gas supply is from the second gas supply tank 5, after the liquid level of the second gas supply tank 5 drops to the second preset liquid level; when the liquid level of the first gas supply tank 4 is not greater than the first preset liquid level and the pressure of the first gas supply tank 4 is less than the pressure of the condenser 2, open the second sub-control valve 62 to enable the condenser 2 to supplement refrigerant to the first gas supply tank 4; during the refrigerant supplementation process, stop until the pressure in the first gas supply tank 4 reaches the pressure of the condenser 2 and the liquid level in the first gas supply tank 4 reaches the third liquid level, or stop when the liquid level reaches the fourth preset liquid level, or stop after the liquid level in the second gas supply tank drops to the first preset liquid level. If during the air supplementation process, the pressure in the first gas supply tank 4 reaches the pressure of the condenser 2 but the liquid level in the first gas supply tank 4 does not reach the third preset liquid level, then open the first pressure relief valve 71 to reduce the pressure in the first gas supply tank 4 to enable the condenser 2 to continue supplementing refrigerant to the first gas supply tank 4. After the liquid level of the second gas supply tank 5 drops to the first preset liquid level, close the sixth sub-control valve and open the fifth sub-control valve to enable the first gas supply tank to supply gas to the compressor.

[0080] Among them, "determining the opening degrees of the pressure relief valve and the control valve corresponding to the non-gas-supplying gas supply tank according to the liquid level and pressure of the non-gas-supplying gas supply tank" further includes:

[0081] If the liquid level of the non-gas-supplying gas supply tank is not greater than the first preset liquid level and the pressure of the non-gas-supplying gas supply tank is not less than the pressure of the condenser 2, relieve the pressure of the non-gas-supplying gas supply tank, and after the pressure relief, open the control valve on the condenser 2 side to supplement refrigerant to the non-gas-supplying gas supply tank.

[0082] If the current gas supply is from the first gas supply tank 4, after the liquid level of the first gas supply tank 4 drops to the second preset liquid level; when the liquid level of the second gas supply tank 5 is not greater than the first preset liquid level and the pressure of the second gas supply tank 5 is not less than the pressure of the condenser 2, open the second pressure relief valve 72 (the pressure relief duration lasts for the first preset duration, and after pressure relief, it can ensure that the refrigerant in the second gas supply tank 5 is replenished to at least the third preset liquid level) to relieve the pressure of the second gas supply tank 5. After the pressure relief is completed, open the fourth sub-control valve 64 to enable the condenser 2 to replenish the refrigerant to the second gas supply tank 5; during the process of replenishing the refrigerant, stop when the pressure in the second gas supply tank 5 reaches the pressure of the condenser 2 and the liquid level in the second gas supply tank 5 reaches the third liquid level, or stop when the liquid level reaches the fourth preset liquid level, or stop after the liquid level of the first gas supply tank drops to the first preset liquid level. After the liquid level of the first gas supply tank 4 drops to the first preset liquid level, close the fifth sub-control valve and open the sixth sub-control valve to enable the second gas supply tank to supply gas to the compressor.

[0083] If the current gas supply is from the second gas supply tank 5, after the liquid level of the second gas supply tank 5 drops to the second preset liquid level; when the liquid level of the first gas supply tank 4 is not greater than the first preset liquid level and the pressure of the first gas supply tank 4 is not less than the pressure of the condenser 2, open the first pressure relief valve 71 (the pressure relief duration lasts for the first preset duration, and after pressure relief, it can ensure that the refrigerant in the first gas supply tank 4 is replenished to at least the third preset liquid level) to relieve the pressure of the first gas supply tank 4. After the pressure relief is completed, open the second sub-control valve 62 to enable the condenser 2 to replenish the refrigerant to the first gas supply tank 4; during the process of replenishing the refrigerant, stop when the pressure in the first gas supply tank 4 reaches the pressure of the condenser 2 and the liquid level in the first gas supply tank 4 reaches the third liquid level, or stop when the liquid level reaches the fourth preset liquid level. After the liquid level of the second gas supply tank 5 drops to the first preset liquid level, close the sixth sub-control valve and open the fifth sub-control valve to enable the first gas supply tank to supply gas to the compressor.

[0084] As Figure 2 shown, the control method of the air conditioning system includes the following detailed steps:

[0085] S1. Obtain the state of the air conditioning system;

[0086] S2. Determine whether the air conditioning system is in the startup preparation stage. If so, proceed to step S3; if not, proceed to step S6;

[0087] S3. Determine whether the liquid level of the first gas supply tank 4 is greater than the first preset liquid level. If so, open the fifth sub-control valve 65 and the first electric heater 41; then perform the startup operation, and then proceed to step S4. If not, proceed to step S5.

[0088] S4. Determine whether the liquid level of the second gas supply tank 5 is greater than the first preset liquid level. If so, perform step S1 after a preset time period. If not, open the third sub-control valve 63 and the fourth sub-control valve 64 to replenish the refrigerant for the second gas supply tank 5; perform step S1 after a preset time period.

[0089] S5. Determine whether the liquid level of the second gas supply tank 5 is greater than the first preset liquid level. If so, open the sixth sub-control valve 66 and the second electric heater 51, and open the first sub-control valve 61 and the second sub-control valve 62 to replenish the refrigerant for the first gas supply tank 4; then perform the startup operation, and then perform step S1. If not, open the first sub-control valve 61, the second sub-control valve 62, the third sub-control valve 63 and the fourth sub-control valve 64 to replenish the refrigerant for the second gas supply tank 5 at the same time. And after a second preset time period, perform step S3.

[0090] S6. Determine whether the air-conditioning system is in an operating state. If so, perform step S7; if not, perform step S18;

[0091] S7. Determine whether the first gas supply tank 4 is supplying gas to the compressor 1; if so, perform step S8; if not, perform step S11.

[0092] S8. Determine whether the liquid level of the first gas supply tank 4 has dropped to the third preset liquid level. If so, perform step S9; if not, perform step S1 after a preset time period.

[0093] S9. Determine whether the liquid level of the second gas supply tank 5 is greater than the first preset liquid level. If so, perform step S10; if not, perform step S12.

[0094] S10. Determine whether the liquid level of the first gas supply tank 4 has dropped to the second preset liquid level. If so, perform step S11; if not, perform step S1 after a preset time period.

[0095] S11. Determine whether the liquid level of the first gas supply tank 4 has dropped to the first preset liquid level. If so, open the sixth sub-control valve and close the fifth sub-control valve to make the second gas supply tank 5 supply gas to the compressor 1; perform step S1 after a preset time period. If not, open the second electric heater 51 to increase the refrigerant pressure in the second gas supply tank 5, and perform step S1 after a preset time period.

[0096] S12. Determine whether the pressure of the second gas supply tank 5 is less than the pressure of the condenser 2. If so, open the fourth sub-control valve 64 to replenish the refrigerant for the second gas supply tank 5; perform step S1 after a preset time period. If not, open the second pressure relief valve 72 to relieve the pressure of the second gas supply tank 5; perform step S1 after a preset time period.

[0097] S13. Determine whether the liquid level of the second gas supply tank 5 has dropped to the third preset liquid level. If so, proceed to step S14; if not, proceed to step S1 after a preset time period.

[0098] S14. Determine whether the liquid level of the first gas supply tank 4 is greater than the first preset liquid level. If so, proceed to step S15; if not, proceed to step S17.

[0099] S15. Determine whether the liquid level of the second gas supply tank 5 has dropped to the second preset liquid level. If so, proceed to step S16; if not, proceed to step S1 after a preset time period.

[0100] S16. Determine whether the liquid level of the second gas supply tank 5 has dropped to the first preset liquid level. If so, open the fifth sub-control valve and close the sixth sub-control valve to supply gas to the compressor 1 from the first gas supply tank 4; proceed to step S1 after a preset time period. If not, open the first electric heater 41 to increase the refrigerant pressure in the first gas supply tank 4, and proceed to step S1 after a preset time period.

[0101] S17. Determine whether the pressure of the first gas supply tank 4 is less than the pressure of the condenser 2. If so, open the second sub-control valve 62 to replenish refrigerant to the first gas supply tank 4; proceed to step S1 after a preset time period. If not, open the first pressure relief valve 71 to relieve pressure from the first gas supply tank 4; proceed to step S1 after a preset time period.

[0102] S18. Determine whether the air conditioning system is in a shutdown state. If so, the first control valve, the second control valve, the third control valve, the first pressure relief valve 71, and the second pressure relief valve 72 are all in a closed state.

[0103] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that, It includes an air suspension compressor (1), an evaporator (3), a condenser (2), a first gas supply tank (4) and a second gas supply tank (5); Both the evaporator (3) and the condenser (2) are connected to the compressor (1); Both the evaporator (3) and the condenser (2) are connected to the first gas supply tank (4), and a first control valve is provided between the evaporator (3) and the condenser (2) and the first gas supply tank (4); Both the evaporator (3) and the condenser (2) are connected to the second gas supply tank (5), and a second control valve is provided between the evaporator (3) and the condenser (2) and the second gas supply tank (5); Both the first gas supply tank (4) and the second gas supply tank (5) are connected to the gas supply port of the compressor (1) for supplying gas to the air suspension bearing of the compressor (1), and a third control valve is provided between the first gas supply tank (4), the second gas supply tank (5) and the compressor (1).

2. The air conditioning system according to claim 1, wherein, The top of the first gas supply tank (4) is connected to the evaporator (3), and a first pressure relief valve (71) is provided between the first gas supply tank (4) and the evaporator (3), and the first pressure relief valve (71) is used to control whether the first gas supply tank (4) relieves pressure; and / or The top of the second gas supply tank (5) is connected to the evaporator (3), and a second pressure relief valve (72) is provided between the second gas supply tank (5) and the evaporator (3), and the second pressure relief valve (72) is used to control whether the second gas supply tank (5) relieves pressure.

3. The air conditioning system according to claim 2, wherein, Heaters are provided in both the first gas supply tank (4) and the second gas supply tank (5) for heating the refrigerant.

4. A control method for an air conditioning system according to any one of claims 1-3, characterized in that, The control method includes: Determine the gas supply tank for supplying gas to the compressor (1) according to the state of the air conditioning system and the liquid levels of the first gas supply tank (4) and the second gas supply tank (5).

5. The control method of the air conditioning system according to claim 4, characterized in that, "Determine the gas supply tank for supplying gas to the compressor (1) according to the state of the air conditioning system and the liquid levels of the first gas supply tank (4) and the second gas supply tank (5)" includes: When the air conditioning system is in a shutdown state, the first control valve, the second control valve and the third control valve are all in a closed state.

6. The control method of the air-conditioning system according to claim 5, characterized in that, "Determine the gas supply tank for supplying gas to the compressor (1) according to the state of the air conditioning system and the liquid levels of the first gas supply tank (4) and the second gas supply tank (5)" includes: When the air conditioning system is in the startup preparation stage, determine the opening degrees of the first control valve and the second control valve and the gas supply tank for supplying gas to the compressor (1) according to the liquid levels of the first gas supply tank (4) and the second gas supply tank (5).

7. The control method of the air conditioning system according to claim 6, wherein, "Determine the opening degrees of the first control valve and the second control valve and the gas supply tank for supplying gas to the compressor (1) according to the liquid levels of the first gas supply tank (4) and the second gas supply tank (5)" includes: If the liquid levels of both the first gas supply tank (4) and the second gas supply tank (5) are greater than the first preset liquid level, the first gas supply tank (4) supplies gas to the compressor (1); If the liquid level of one of the first gas supply tank (4) and the second gas supply tank (5) is greater than the first preset liquid level, the gas supply tank with the liquid level greater than the first preset liquid level supplies gas to the compressor (1) and replenishes refrigerant to the other gas supply tank; If the liquid levels of both the first gas supply tank (4) and the second gas supply tank (5) are not greater than the first preset liquid level, refrigerant is replenished to both the first gas supply tank (4) and the second gas supply tank (5) simultaneously, and the gas supply tank whose liquid level reaches the first preset liquid level first supplies gas to the compressor (1) and continues to replenish refrigerant to the other gas supply tank; When replenishing refrigerant to the first gas supply tank (4), both first control valves are opened; When replenishing refrigerant to the second gas supply tank (5), both second control valves are opened.

8. The control method of the air conditioning system according to claim 5, which cites claim 3, is characterized in that, "Determining the gas supply tank that supplies gas to the compressor (1) according to the state of the air conditioning system and the liquid levels of the first gas supply tank (4) and the second gas supply tank (5)" includes: When the air conditioning system is in an operating state, according to the liquid level of the currently gas-supplying gas supply tank and the liquid levels and pressures of the non-gas-supplying gas supply tanks, determine the opening degrees of the pressure relief valves and control valves corresponding to the non-gas-supplying gas supply tanks; Preferably, "determining the opening degrees of the pressure relief valves and control valves corresponding to the non-gas-supplying gas supply tanks according to the liquid level of the currently gas-supplying gas supply tank and the liquid levels and pressures of the non-gas-supplying gas supply tanks" includes: If the liquid level of the currently gas-supplying gas supply tank drops to the third preset liquid level, then according to the liquid level and pressure of the non-gas-supplying gas supply tank, determine the opening degrees of the pressure relief valve and control valve corresponding to the non-gas-supplying gas supply tank; the third preset liquid level is greater than the first preset liquid level.

9. The control method of the air conditioning system according to claim 8, characterized in that, "Determining the opening degrees of the pressure relief valves and control valves corresponding to the non-gas-supplying gas supply tanks according to the liquid level and pressure of the non-gas-supplying gas supply tanks" includes: If the liquid level of the non-gas-supplying gas supply tank is greater than the first preset liquid level, after the liquid level of the currently gas-supplying gas supply tank drops to the second preset liquid level, the non-gas-supplying gas supply tank starts to be heated; The third preset liquid level is greater than the second preset liquid level, and the second preset liquid level is greater than the first preset liquid level.

10. The control method of the air conditioning system according to claim 5, characterized in that, "Determining the opening degrees of the pressure relief valves and control valves corresponding to the non-gas-supplying gas supply tanks according to the liquid level and pressure of the non-gas-supplying gas supply tanks" includes: If the liquid level of the non-gas-supplying gas supply tank is not greater than the first preset liquid level and the pressure of the non-gas-supplying gas supply tank is less than the pressure of the condenser (2), then open the control valve on the condenser (2) side to replenish refrigerant to the non-gas-supplying gas supply tank; and / or If the liquid level of the non-gas-supplying gas supply tank is not greater than the first preset liquid level and the pressure of the non-gas-supplying gas supply tank is not less than the pressure of the condenser (2), then relieve the pressure of the non-gas-supplying gas supply tank, and after relieving the pressure, open the control valve on the condenser (2) side to replenish refrigerant to the non-gas-supplying gas supply tank.

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