Air conditioning system, control method and device and readable storage medium

Abstract

The invention discloses an air conditioning system, a control method and device and a readable storage medium, relates to the field of air conditioners, and aims to improve cooling of an IPM module of the air conditioning system. The air conditioning system comprises a heat exchanger, a subcooler, a liquid pipe, a control valve and an IPM module. The subcooler comprises a first refrigerant flow channel and a second refrigerant flow channel. The liquid pipe communicates with the first refrigerant flow channel, and the communicating state of the liquid pipe and the second refrigerant flow channel can be adjusted. The control valve includes a first port and a second port. The IPM module comprises a third refrigerant flow channel and a fourth refrigerant flow channel. The other end of the first refrigerant flow channel communicates with one end of the heat exchanger through the third refrigerant flow channel, the communicating state of the other end of the second refrigerant flow channel and one end of the fourth refrigerant flow channel can be adjusted, and the other end of the fourth refrigerant flow channel communicates with a first port of the control valve. The other end of the heat exchanger communicates with a second port of the control valve. According to the technical scheme, the refrigerant from the subcooler of the refrigerant circulation system is used for cooling the IPM module, and the cooling effect is better.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to an air conditioning system, a control method, a device and a readable storage medium. Background Art

[0002] Multi-split air conditioning systems (VRFs) have become indispensable in modern buildings due to their flexible configuration, efficient operation, and precise temperature control. They are widely used in commercial and office buildings, and their energy efficiency and reliability are of great concern to users. However, during VRF operation, the compressor and fan control modules typically generate significant heat, especially the Intelligent Power Module (IPM) within these control modules. Therefore, the heat dissipation efficiency of these control modules has become a key factor limiting system reliability and performance.

[0003] In a multi-split air-source heat pump system, the IPM modules are cooled by air. This method places the modules near air ducts or vents, allowing airflow to remove heat generated by the modules. However, this design requires high outdoor ambient temperatures. When the ambient temperature is too high, the cooling effect is significantly reduced, making it difficult to meet high-load operation requirements.

[0004] The inventors have found that there are at least the following problems in the existing technology: as the power supply voltage of the unit increases, the temperature of the IPM module during operation also increases, especially in some areas where 575V power supply is used. How to reduce the temperature of the IPM module has become an urgent problem to be solved in this field. Summary of the Invention

[0005] The present invention provides an air conditioning system, a control method, a device, and a readable storage medium, for improving the cooling of an IPM module of the air conditioning system.

[0006] An embodiment of the present invention provides an air conditioning system, comprising:

[0007] heat exchangers;

[0008] The subcooler includes a first refrigerant flow channel and a second refrigerant flow channel for exchanging heat with each other;

[0009] a liquid pipe, connected to one end of the first refrigerant flow channel of the subcooler, and having an adjustable communication state with one end of the second refrigerant flow channel of the subcooler;

[0010] a control valve comprising a first port and a second port; and

[0011] The IPM module includes a third refrigerant flow channel and a fourth refrigerant flow channel for exchanging heat with each other;

[0012] Among them, the other end of the first refrigerant flow channel of the subcooler is connected to one end of the heat exchanger via the third refrigerant flow channel, the other end of the second refrigerant flow channel of the subcooler is connected to one end of the fourth refrigerant flow channel in an adjustable state, the other end of the fourth refrigerant flow channel is connected to the first port of the control valve; the other end of the heat exchanger is connected to the second port of the control valve.

[0013] In some embodiments, the air conditioning system further comprises:

[0014] a first throttling element, mounted at an end of the second refrigerant flow channel away from the fourth refrigerant flow channel; and

[0015] a second throttling element, installed between the second refrigerant flow channel and the fourth refrigerant flow channel;

[0016] Wherein, the connection state between the second refrigerant flow channel and the fourth refrigerant flow channel is adjusted by the first throttling element and the second throttling element.

[0017] In some embodiments, the air-conditioning system also includes a gas-liquid separator, which includes an outer shell and an accommodating chamber, and the outer shell is provided with a fifth refrigerant flow channel; the fifth refrigerant flow channel is constructed to exchange heat with the refrigerant in the accommodating chamber and the two are non-connected; one end of the fifth refrigerant flow channel is connected to one end of the second refrigerant flow channel toward the fourth refrigerant flow channel, and the other end of the fifth refrigerant flow channel is connected to one end of the fourth refrigerant flow channel toward the second refrigerant flow channel.

[0018] In some embodiments, the air conditioning system further comprises:

[0019] The third throttling element is installed between the second refrigerant flow channel and the fourth refrigerant flow channel.

[0020] In some embodiments, the refrigerant circulation system further comprises:

[0021] The exhaust gas temperature detection element is installed at the exhaust port of the compressor to detect the exhaust gas temperature of the compressor.

[0022] In some embodiments, the refrigerant circulation system further comprises:

[0023] The suction temperature detection element is installed at the suction port of the compressor to detect the suction temperature of the compressor.

[0024] In some embodiments, the refrigerant circulation system further comprises:

[0025] The steam inlet pipe temperature detection element is installed at the inlet of the gas-liquid separator to detect the inlet temperature of the gas-liquid separator.

[0026] In some embodiments, the refrigerant circulation system further comprises:

[0027] The steam separation outlet pipe temperature detection element is installed at the outlet of the gas-liquid separator to detect the outlet temperature of the gas-liquid separator.

[0028] An embodiment of the present invention further provides an air conditioning system control method, which is implemented using the air conditioning system provided by any technical solution of the present invention. The air conditioning system control method includes the following steps:

[0029] Determine whether the air conditioner is in cooling mode or heating mode;

[0030] If the air conditioner is in cooling mode, determining the range of the temperature T1 of the IPM module;

[0031] According to the interval in which T1 is located, the opening degrees of the first throttle element and the second throttle element of the air-conditioning system are controlled.

[0032] In some embodiments, the interval in which T1 is located includes the following three situations:

[0033] First interval: when the temperature of T1 is greater than or equal to 90°C, the opening of the first throttling element is adjusted to 200 pls, and the opening of the second throttling element is adjusted to 200 pls;

[0034] Second interval: When the temperature of T1 is greater than or equal to 86°C and less than 90°C, the opening of the first throttling element is adjusted to 160pls and the opening of the second throttling element is adjusted to 240pls

[0035] Third interval: when the temperature of T1 is greater than or equal to 80° C. and less than 86° C., the opening of the first throttling element is adjusted to 100 pls, and the opening of the second throttling element is adjusted to 300 pls.

[0036] In some embodiments, the interval in which T1 is located also includes a fourth case:

[0037] Fourth interval: when the temperature of T1 is less than 80° C., the opening of the first throttling element remains unchanged, and the opening of the second throttling element is adjusted to 300 pls.

[0038] In some embodiments, before the step of determining the interval in which the temperature T1 of the IPM module is located, the following steps are further included:

[0039] determining whether the exhaust superheat of the compressor of the air-conditioning system is greater than a first set value;

[0040] If the exhaust superheat of the compressor is greater than or equal to the first set value, the interval of T1 is determined; if the exhaust superheat of the compressor is less than the first set value, the first throttling element and the second throttling element are closed.

[0041] In some embodiments, the first set value is 10°C to 14°C.

[0042] In some embodiments, the air conditioning system control method further includes the following steps:

[0043] If the air conditioning system is in a heating mode, determining whether the exhaust gas superheat of the air conditioning system is greater than or equal to a second set value;

[0044] If the exhaust superheat of the air conditioning system is greater than or equal to a second set value, determining the interval of the intake superheat T2 of the air conditioning system;

[0045] According to the interval in which T2 is located, the openings of the first throttle element and the third throttle element of the air-conditioning system are adjusted, and the second throttle element is closed.

[0046] In some embodiments, when the exhaust gas superheat of the air conditioning system is greater than or equal to a second set value, the interval of T2 is divided into the following three types:

[0047] First intake superheat range: if T2 is less than or equal to 1°C, the opening of the first throttling element is adjusted to 200 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 200 pls;

[0048] Second intake superheat range: When T2 is less than or equal to 3°C and greater than 1°C, the opening of the first throttling element is adjusted to 240 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 400 pls;

[0049] Third intake superheat range: when T2 is less than or equal to 6°C and greater than 3°C, the opening of the first throttling element is adjusted to 180 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 300 pls.

[0050] In some embodiments, the second set value is 23°C to 27°C.

[0051] In some embodiments, if the exhaust gas superheat of the air conditioning system is less than a second set value and greater than or equal to a third set value, then determining the interval in which T2 is located;

[0052] According to the interval in which T2 is located, the openings of the first throttle element and the third throttle element of the air-conditioning system are adjusted, and the second throttle element is closed.

[0053] In some embodiments, when the exhaust gas superheat of the air conditioning system is less than the second set value and greater than or equal to the third set value, the interval in which T2 is located is divided into the following three types:

[0054] Fourth intake superheat range: when T2 is less than or equal to 1°C, the opening of the first throttling element is adjusted to 120 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 480 pls;

[0055] Fifth intake superheat range: When T2 is less than or equal to 3°C and greater than 1°C, the opening of the first throttling element is adjusted to 100 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 400 pls.

[0056] Sixth intake superheat range: when T2 is less than or equal to 6°C and greater than 3°C, the opening of the first throttling element is adjusted to 70 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 300 pls.

[0057] In some embodiments, the air conditioning system control method further includes the following steps:

[0058] If the air conditioning system is in a heating mode, determining whether the exhaust gas superheat of the air conditioning system is greater than or equal to a second set value;

[0059] If the exhaust gas superheat of the air conditioning system is greater than or equal to a second set value, determining the interval in which the difference T3 between the inlet pipe temperature of the gas-liquid separator of the air conditioning system and the outlet pipe temperature of the gas-liquid separator is located;

[0060] According to the interval in which T3 is located, the openings of the first throttle element and the third throttle element of the air-conditioning system are adjusted, and the second throttle element is closed.

[0061] In some embodiments, when the exhaust gas superheat of the air conditioning system is greater than or equal to a second set value, the interval of T3 is divided into the following three types:

[0062] First temperature difference range: if T3 is less than or equal to 0°C, the opening of the first throttling element is adjusted to 480 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 480 pls;

[0063] Second temperature difference range: if T3 is less than or equal to 2°C and greater than 0°C, the opening of the first throttling element is adjusted to 400 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 400 pls;

[0064] The third temperature difference range: if T3 is less than or equal to 5°C and greater than 2°C, the opening of the first throttling element is adjusted to 300 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 300 pls.

[0065] In some embodiments, the second set value is 23°C to 27°C.

[0066] In some embodiments, if the exhaust gas superheat of the air conditioning system is less than a second set value and greater than or equal to a third set value, then determining the interval in which T3 is located;

[0067] According to the interval in which T3 is located, the openings of the first throttle element and the third throttle element of the air-conditioning system are adjusted, and the second throttle element is closed.

[0068] In some embodiments, when the exhaust gas superheat of the air conditioning system is less than the second set value and greater than or equal to the third set value, the interval in which T3 is located includes the following three types:

[0069] Fifth temperature difference range: when T3 is less than or equal to 0°C, the opening of the first throttling element is adjusted to 400 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 480 pls;

[0070] Sixth temperature difference range: if T3 is less than or equal to 2°C and greater than 0°C, the opening of the first throttling element is adjusted to 300 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 400 pls;

[0071] Seventh temperature difference range: if T3 is less than or equal to 5°C and greater than 2°C, the opening of the first throttling element is adjusted to 240 pls, the opening of the second throttling element is maintained at 0, and the opening of the third throttling element is adjusted to 300 pls.

[0072] In some embodiments, when the exhaust superheat of the air-conditioning system is less than the second set value and greater than or equal to the third set value, the interval in which T3 is located also includes the following fourth type: T3 is in the eighth temperature difference interval: the T3 is greater than 5°C, then the opening of the first throttling element, the opening of the second throttling element and the opening of the third throttling element are all kept at 0.

[0073] An embodiment of the present invention further provides an air conditioning system control device, comprising:

[0074] Memory; and

[0075] A processor coupled to the memory, wherein the processor is configured to execute the air-conditioning system control method provided by any technical solution of the present invention based on instructions stored in the memory.

[0076] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the air-conditioning system control method provided by any technical solution of the present invention is implemented.

[0077] In the air-conditioning system provided by the above technical solution, the subcooler includes a first refrigerant flow channel and a second refrigerant flow channel for exchanging heat with each other, and its IPM module is provided with a third refrigerant flow channel and a fourth refrigerant flow channel for exchanging heat with each other. The second refrigerant flow channel and the fourth refrigerant flow channel can switch between a connected state and a non-connected state. When the second refrigerant flow channel and the fourth refrigerant flow channel are connected, the third refrigerant flow channel and the fourth refrigerant flow channel can exchange heat, so as to utilize the refrigerant flowing out of the subcooler in the refrigerant circulation system to cool the IPM module. The above technical solution has a better cooling effect on the IPM module and does not require the introduction of other cooling media, making the cooling operation of the IPM module more reliable and maintaining its temperature within the allowable range. At the same time, the refrigerant circulation path of the entire air-conditioning system is optimized, which can fully utilize the high latent heat characteristics and efficient heat exchange capacity of the subcooler refrigerant to achieve precise heat dissipation of the IPM module, thereby improving the operating efficiency and reliability of the multi-split air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. 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:

[0079] Figure 1 This is a schematic diagram of the air-conditioning system in cooling mode provided by an embodiment of the present invention.

[0080] Figure 2 This is a schematic diagram of the air-conditioning system in heating mode provided by an embodiment of the present invention.

[0081] Figure 3 This is a control principle diagram of the air conditioning system control method provided in an embodiment of the present invention for cooling the IPM module and preventing the air conditioning system from having too low an intake superheat.

[0082] Figure 4 The air conditioning system control method provided in an embodiment of the present invention is a control logic diagram for cooling an IPM module.

[0083] Figure 5 This is a control logic diagram of the air conditioning system control method provided by an embodiment of the present invention to prevent the air intake superheat of the air conditioning system from being too low.

[0084] Figure 6 A control principle diagram of an air-conditioning system control method provided in an embodiment of the present invention for preventing freezing of a gas-liquid separator.

[0085] Figure 7 The air-conditioning system control method provided in an embodiment of the present invention is a control logic diagram for preventing the gas-liquid separator from freezing.

[0086] Reference numerals:

[0087] 1. Heat exchanger; 2. Subcooler; 3. Liquid pipe; 4. Control valve; 5. IPM module; 6. First throttling element; 7. Second throttling element; 8. Gas-liquid separator; 9. Third throttling element; 10. Exhaust gas temperature sensing element; 11. Intake gas temperature sensing element; 12. Steam separator inlet pipe temperature sensing element; 13. Steam separator outlet pipe temperature sensing element; 14. Gas pipe; 15. Compressor; 16. Oil separator;

[0088] 21. First refrigerant flow channel; 22. Second refrigerant flow channel;

[0089] 41. First port; 42. Second port; 43. Third port; 44. Fourth port;

[0090] 51. Third refrigerant flow channel; 52. Fourth refrigerant flow channel;

[0091] 81. Outer shell; 82. Accommodating chamber; 83. Fifth refrigerant flow channel. DETAILED DESCRIPTION

[0092] The following combination Figures 1 to 7 The technical solutions provided by the present invention are described in more detail. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions and numerical values ​​described in these embodiments should be interpreted as merely exemplary and not as limiting.

[0093] The terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are simply used to distinguish one part from another. Terms such as "include" or "comprise" mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements.

[0094] In the present disclosure, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0095] All terms used in this disclosure, including technical or scientific terms, have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0096] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment are considered part of the specification.

[0097] The dimensions of the various parts shown in the drawings are not drawn in accordance with actual proportions. In the drawings, common structural elements or structural elements of the same type are given the same reference numerals, and their repeated descriptions are appropriately omitted.

[0098] After research, the inventors found that: during the operation of the unit, affected by factors such as component selection, ambient temperature, and power supply voltage, the IPM temperature sometimes rises to above 90°C. Exceeding this temperature will greatly shorten the service life of the IPM module, and the IPM module will not be able to operate effectively after exceeding 100°C. In addition, during the refrigerant circulation process, affected by factors such as low temperature and excessive refrigerant charge, the evaporation of the refrigerant in the evaporator is sometimes not sufficient, and liquid refrigerant will enter the gas-liquid separator (abbreviated as vapor separator), resulting in low gas-liquid separation efficiency and causing liquid backflow. In addition, under low temperature conditions, there are risks such as low suction superheat and freezing of the gas-liquid separator. The technical solution of the present application can not only solve the problem of IPM heat dissipation, but its further solution can also solve problems such as low suction superheat and freezing of the gas-liquid separator.

[0099] See also Figure 1Some embodiments of the present invention provide an air conditioning system that is particularly suitable for areas using 575V power, but is also suitable for areas using 220V power. The air conditioning system includes a heat exchanger 1, a subcooler 2, a liquid pipe 3, a control valve 4, and an IPM module 5. The subcooler 2 includes a first refrigerant channel 21 and a second refrigerant channel 22, which exchange heat with each other. The liquid pipe 3 is connected to one end of the first refrigerant channel 21 of the subcooler 2, and its connection with one end of the second refrigerant channel 22 of the subcooler 2 is adjustable. The control valve 4 includes a first port 41 and a second port 42. The IPM module 5 includes a third refrigerant channel 51 and a fourth refrigerant channel 52, which exchange heat with each other. The other end of the first refrigerant channel 21 of the subcooler 2 is connected to one end of the heat exchanger 1 via the third refrigerant channel 51, and the other end of the second refrigerant channel 22 of the subcooler 2 is adjustable in its connection with one end of the fourth refrigerant channel 52. The other end of the fourth refrigerant channel 52 is connected to the first port 41 of the control valve 4. The other end of the heat exchanger 1 is communicated with the second port 42 of the control valve 4 .

[0100] IPM module 5 stands for Intelligent Power Module. It's an electronic module that intelligently controls the operation of compressor 15. Whenever compressor 15 is running, IPM module 5 operates and generates heat. Regardless of whether the air conditioning system is in cooling or heating mode, IPM module 5 must dissipate heat. Summer temperatures are higher, making heat dissipation more challenging. Therefore, the need for heat dissipation from IPM module 5 is even more pressing under high-temperature operating conditions.

[0101] Herein, the adjustable connectivity state refers to whether the two can be connected, and when the two are in a connected state, the size of the connected area is adjustable.

[0102] The control valve 4 can be a four-way valve. The air conditioning system also includes an oil separator 16, a liquid pipe 3, an air pipe 14, and a heat exchange component. The heat exchange component is the indoor heat exchanger of the air conditioning system, and heat exchanger 1 is the outdoor heat exchanger of the air conditioning system. The four-way valve has four ports: a first port 41 connects to the accommodating chamber 82 of the gas-liquid separator 8 (described later); a second port 42 connects to the heat exchanger 1; a third port 43 connects to the oil separator 16; and a fourth port 44 connects to the air pipe 14.

[0103] In the air-conditioning system provided by the above technical solution, the subcooler 2 includes a first refrigerant flow channel 21 and a second refrigerant flow channel 22. The first refrigerant flow channel 21 participates in the main refrigerant circulation of the refrigerant circulation system. The second refrigerant flow channel 22 determines whether to flow refrigerant as needed. If there is refrigerant in the second refrigerant flow channel 22, the refrigerant in the first refrigerant flow channel 21 and the refrigerant in the second refrigerant flow channel 22 are heat exchanged. A third refrigerant flow channel 51 and a fourth refrigerant flow channel 52 are provided inside the IPM module 5, wherein the third refrigerant flow channel 51 participates in the main refrigerant circulation of the refrigerant circulation system. The fourth refrigerant flow channel 52 determines whether to flow refrigerant as needed. If there is refrigerant in the fourth refrigerant flow channel 52, the refrigerant in the third refrigerant flow channel 51 and the refrigerant in the fourth refrigerant flow channel 52 are heat exchanged.

[0104] The second refrigerant flow channel 22 can be connected to the fourth refrigerant flow channel 52. Regardless of whether the air conditioning system is in cooling mode or heating mode, as long as the second refrigerant flow channel 22 and the fourth refrigerant flow channel 52 are connected, the refrigerant flows from the second refrigerant flow channel 22 to the fourth refrigerant flow channel 52.

[0105] Continue to see Figure 1 In some embodiments, the air conditioning system further includes a first throttling element 6 and a second throttling element 7. The first throttling element 6 is installed at an end of the second refrigerant flow channel 22 away from the fourth refrigerant flow channel 52. The second throttling element 7 is installed between the second refrigerant flow channel 22 and the fourth refrigerant flow channel 52. The first throttling element 6 and the second throttling element 7 regulate the communication state between the second refrigerant flow channel 22 and the fourth refrigerant flow channel 52.

[0106] The first throttling element 6 and / or the second throttling element 7 adopts an electronic expansion valve. By controlling the opening of the first throttling element 6 and the second throttling element 7, it is possible to control whether the second refrigerant flow channel 22 is conductive and whether the fourth refrigerant flow channel 52 is conductive. In this article, conductive means that the refrigerant can flow through the flow channel. In this article, the first throttling element 6 is open, which means that the flow channel where the first throttling element 6 is located is conductive, and the first throttling element 6 is closed, which means that the flow channel where the first throttling element 6 is located is disconnected. Similarly, when the second throttling element 7 is open, the flow channel where the second throttling element 7 is located is conductive, and the refrigerant can flow through. When the second throttling element 7 is closed, the flow channel where the second throttling element 7 is located is disconnected, and the refrigerant cannot flow through. The third throttling element 9 introduced later is also described similarly: the third throttling element 9 is open, which means that the flow channel where the third throttling element 9 is located is conductive, and the third throttling element 9 is closed, which means that the flow channel where the third throttling element 9 is located is disconnected.

[0107] See also Figure 2In some embodiments, the refrigerant circulation system also includes a gas-liquid separator 8, which includes a shell 81 and a accommodating chamber 82, and the shell 81 is provided with a fifth refrigerant flow channel 83; the fifth refrigerant flow channel 83 is constructed to exchange heat with the refrigerant in the accommodating chamber 82 and the two are not connected; one end of the fifth refrigerant flow channel 83 is connected to one end of the second refrigerant flow channel 22 toward the fourth refrigerant flow channel 52, and the other end of the fifth refrigerant flow channel 83 is connected to one end of the fourth refrigerant flow channel 52 toward the second refrigerant flow channel 22.

[0108] The accommodating chamber 82 of the gas-liquid separator 8 is used to achieve gas-liquid separation of the refrigerant in the main circulation loop of the refrigerant circulation system. The fifth refrigerant flow channel 83 provided on the inner wall of the housing 81 of the gas-liquid separator 8 is used to achieve heat exchange with the refrigerant in the accommodating chamber 82 of the gas-liquid separator 8. When the air-conditioning system is in cooling mode, when necessary, the refrigerant in the fifth refrigerant flow channel 83 can heat the refrigerant in the accommodating chamber 82 of the gas-liquid separator 8 to prevent the gas-liquid separator 8 from freezing. This will be described in detail later.

[0109] See also Figure 2 In some embodiments, the air conditioning system further includes a third throttling element 9 , which is installed between the second refrigerant flow channel 22 and the fourth refrigerant flow channel 52 .

[0110] The third throttling element 9 may be an electronic expansion valve, a capillary tube, a thermal expansion valve, or a combined throttling structure. The combined throttling structure may be implemented by, for example, connecting an electronic expansion valve and a capillary tube, or a thermal expansion valve in series, or combining a solenoid valve and a throttling orifice plate. The electronic expansion valve can precisely control the valve core opening to achieve precise regulation of the refrigerant flow rate. The adjustment range is wide, and the opening can be continuously changed from 0% to 100%. The capillary tube is mainly composed of a slender copper tube, and throttling is achieved by forming flow resistance due to the tube diameter and length. The thermal expansion valve can automatically adjust the valve core opening and is a passive flow control element.

[0111] In the above technical solution, the refrigerant coming out of the fifth refrigerant flow channel 83 is further cooled by the third throttling element 9, and the cooled refrigerant returns to the accommodating chamber 82 of the gas-liquid separator 8 through the fourth refrigerant flow channel 52 for gas-liquid separation.

[0112] In some embodiments, the refrigerant circulation system further includes an exhaust temperature detection element 10 . The exhaust temperature detection element 10 is installed at the exhaust port of the compressor 15 to detect the exhaust temperature of the compressor 15 .

[0113] The exhaust temperature detection element 10 is used to detect the exhaust temperature of the compressor 15. The exhaust temperature detection element 10 can be implemented in the form of a thermistor detection element, a thermocouple detection element, an infrared temperature sensor, etc. The exhaust temperature detection element 10 can detect the exhaust temperature of the compressor 15 in real time, so that corresponding control measures can be taken according to the exhaust temperature of the compressor 15 to prevent overheating from causing carbonization of the lubricating oil and reduce the probability of the motor being burned. In addition, the energy efficiency of the air-conditioning system can also be optimized: for example, the opening of at least one of the first throttling element 6, the second throttling element 7, and the third throttling element 9 can be adjusted through the exhaust temperature feedback of the compressor 15, so that the air-conditioning system maintains the required intake superheat. In addition, based on the exhaust temperature of the compressor 15, it can also be determined whether the air-conditioning system has an abnormality.

[0114] In some embodiments, the refrigerant circulation system further includes an intake air temperature detection element 11, which is mounted at the intake port of the compressor 15 to detect the intake air temperature of the compressor 15. The intake air temperature detection element 11 can be a thermistor detection element, a platinum resistance detection element, a thermocouple detection element, a semiconductor integrated temperature sensor, an optical fiber temperature sensor, or other types.

[0115] The intake temperature detection element 11 is installed at the intake port of the compressor 15. The intake superheat can be calculated based on the detection results of the intake temperature detection element 11 and the intake pressure. If the intake superheat is insufficient, it means that liquid refrigerant may have entered the compressor 15. In this case, a corresponding control strategy can be adopted to avoid liquid hammer and cause the compressor 15 to malfunction. Details will be given later. In addition, the opening degree of at least one of the first throttling element 6, the second throttling element 7, and the third throttling element 9 can also be controlled according to the intake superheat. Details will be given later. In addition, if the intake temperature of the compressor 15 increases abnormally and the pressure decreases, it may be that an abnormal phenomenon such as refrigerant leakage has occurred in the air conditioning system. The detection results of the intake temperature detection element 11 can help to judge the status of the air conditioning system and detect abnormal conditions in a timely manner.

[0116] In some embodiments, the refrigerant circulation system further includes a steam inlet pipe temperature detection element 12 , which is installed at the inlet of the gas-liquid separator 8 to detect the inlet temperature of the gas-liquid separator 8 .

[0117] The steam inlet pipe temperature detection element 12 can adopt a negative temperature coefficient thermistor sensor or a platinum resistance sensor. The inlet temperature of the gas-liquid separator 8 directly reflects the gas-liquid two-phase state of the refrigerant. When it is detected that the refrigerant temperature at the inlet of the gas-liquid separator 8 is abnormally low, it indicates that the proportion of liquid refrigerant is too high. Subsequently, the frequency of the compressor 15 can be reduced or other methods can be adopted to reduce or even avoid liquid refrigerant entering the compressor 15 and causing liquid hammer damage. The above technical solution realizes real-time monitoring and precise control of the refrigerant state at the inlet of the gas-liquid separator 8, significantly improving the safety and energy efficiency of the air-conditioning system.

[0118] In some embodiments, the refrigerant circulation system further includes a steam separation pipe temperature detection element 13 , which is installed at the outlet of the gas-liquid separator 8 to detect the outlet temperature of the gas-liquid separator 8 .

[0119] The steam separator outlet pipe temperature detection element 13 can be a negative temperature coefficient thermistor or a platinum resistance sensor. The outlet temperature of the gas-liquid separator 8 directly reflects the gaseous purity of the refrigerant. An abnormally low temperature indicates that the gas-liquid separator 8 is not separating the gas thoroughly, and liquid refrigerant may enter the compressor 15. Subsequently, the compressor 15 frequency can be reduced or other measures can be taken to reduce or even prevent liquid hammer damage to the compressor 15.

[0120] The air conditioning system has heating mode and cooling mode.

[0121] See also Figure 1 In cooling mode, the first port 41 and the fourth port 44 of the four-way valve are connected, and the second port 42 and the third port 43 are connected. The refrigerant flows in the following manner: after flowing out of the compressor 15, it enters the oil separator 16, then enters the third port 43 of the four-way valve, and then flows into the heat exchanger 1 from the second port 42 of the four-way valve, and then enters the second refrigerant flow channel 22 of the IPM module 5, and then flows into the first refrigerant flow channel 21 of the subcooler 2. Afterwards, if the first throttling element 6 and the second throttling element 7 are both in the conducting state, and the third throttling element 9 is in the disconnected state, then the refrigerant flowing out of the first refrigerant flow channel 21 of the subcooler 2 is divided into two paths:

[0122] The first route: flows to the liquid pipe 3, then flows to the heat exchange component (i.e., the indoor heat exchanger, not shown in the figure), then returns from the gas pipe 14, passes through the fourth port 44 and the first port 41 of the four-way valve, and enters the accommodating chamber 82 of the gas-liquid separator 8 for gas-liquid separation.

[0123] The second route: flows through the first throttling element 6 to the second refrigerant flow channel 22 of the subcooler 2, then passes through the second throttling element 7 to enter the fourth refrigerant flow channel 52 of the IPM module 5, and finally flows out from the fourth refrigerant flow channel 52 and enters the accommodating cavity 82 of the gas-liquid separator 8 for gas-liquid separation.

[0124] The above-mentioned refrigerant flow process has a cooling effect on the IPM module 5, and no additional refrigerant is required, and the refrigerant from the compressor 15 can be directly used.

[0125] During cooling mode, the high-temperature, high-pressure gas discharged from compressor 15 passes through oil separator 16. The lubricating oil then returns to compressor 15 through the oil circuit, while the refrigerant gas enters heat exchanger 1 (outdoor heat exchanger) where it condenses into a high-pressure liquid. The high-pressure liquid then passes through a throttling device (such as an electronic expansion valve) to reduce its pressure. After being subcooled by cooler 2, it enters the heat exchange component (indoor heat exchanger). In the indoor heat exchanger, the refrigerant evaporates into a low-pressure gas and enters gas-liquid separator 8. The separated gas enters compressor 15 for compression, converting it into high-pressure gas and continuing the cycle.

[0126] See also Figure 2 In heating mode, the first port 41 and second port 42 of control valve 4 are connected, and the third port 43 and fourth port 44 are connected. The refrigerant flows as follows: after exiting compressor 15, it enters oil separator 16, then enters third port 43 of control valve 4. It then flows through fourth port 44 of control valve 4 into gas pipe 14, and then into the heat exchange component (i.e., the indoor heat exchanger). It then returns through liquid pipe 3 to first refrigerant flow channel 21 of subcooler 2, enters third refrigerant flow channel 51 of IPM module 5, and then enters heat exchanger 1 (i.e., the outdoor heat exchanger). It then flows into second port 42 of control valve 4, and finally enters chamber 82 of gas-liquid separator 8 through first port 41 of control valve 4.

[0127] During heating mode, the high-temperature, high-pressure gas discharged from compressor 15 passes through the condenser chamber and is condensed into a high-pressure liquid. It is then adiabatically throttled by the throttling device and supercooled by subcooler 2 before entering the evaporator chamber. It then evaporates in the evaporator to form a low-pressure gaseous refrigerant that enters gas-liquid separator 8. The separated gas then enters compressor 15 for adiabatic compression, becoming a high-pressure gas that continues its circulation.

[0128] The first throttling element 6, the second throttling element 7 and the third throttling element 9 are in a normally closed state. When the system detects that the suction superheat is too low, the steam outlet pipe temperature of the gas-liquid separator 8 is lower than the steam inlet pipe temperature, the exhaust temperature of the compressor 15 is too high, and the temperature of the IPM module 5 is too high, the first throttling element 6 is opened, and the second throttling element 7 or the third throttling element 9 is controlled at the same time, so that the gas at the outlet of the subcooler 2 can flow to the specified position according to the opening degree of each throttling element, thereby achieving the goals of increasing the suction superheat, increasing the steam temperature, and reducing the temperature of the IPM module 5.

[0129] In this case, if the first throttle element 6 is in the on state, the third throttle element 9 is also in the on state, and the second throttle element 7 is in the off state, then in addition to entering the first refrigerant flow channel 21 of the subcooler 2, some of the refrigerant from the liquid pipe 3 will enter the second refrigerant flow channel 22 of the subcooler 2 through the first throttle element 6, and then enter the fifth refrigerant flow channel 83 of the gas-liquid separator 8. The refrigerant flowing out of the fifth refrigerant flow channel 83 enters the fourth refrigerant flow channel 52 of the IPM module 5 through the third throttle element 9, and then flows out of the fourth refrigerant flow channel 52 and into the accommodating chamber 82 of the gas-liquid separator 8. The refrigerant in the fifth refrigerant flow channel 83 heats the refrigerant in the accommodating chamber 82, preventing the refrigerant in the accommodating chamber 82 from freezing and preventing the air conditioning system's intake air superheat from being too low. Specifically, the air conditioning system can be controlled to prevent refrigerant freezing in the accommodating chamber 82 or to prevent the intake air superheat from being too low by controlling the opening of the first throttle element 6 and the third throttle element 9. When the intake air superheat is too low, the exhaust gas temperature detection element 10, the intake gas temperature detection element 11, the steam separator inlet pipe temperature detection element 12, and the steam separator outlet pipe temperature detection element 13 are used to detect the temperature. The temperature sensor inside the IPM also provides temperature feedback.

[0130] The air-conditioning system provided by the above technical solution is provided with a third refrigerant flow channel 51 and a fourth refrigerant flow channel 52 for the IPM module 5, which can exchange heat with each other. The refrigerant in the refrigerant circulation system can be used to cool the IPM module 5 as needed to avoid the temperature of the IPM module 5 being too high.

[0131] See also Figures 3 to 5 The embodiment of the present invention further provides an air conditioning system control method, which is implemented by the air conditioning system provided by any technical solution of the present invention. The air conditioning system control method includes the following steps:

[0132] Step S100: Determine whether the air conditioner is in cooling mode or heating mode.

[0133] In cooling mode, the air conditioning system is more likely to have the phenomenon of the temperature of the IPM module 5 being too high. In heating mode, the air conditioning system is more likely to have the phenomenon of the suction superheat being too low and the gas-liquid separator 8 being frozen. Figure 3 It mainly illustrates a control principle diagram of an air-conditioning system control method for cooling the IPM module 5 .

[0134] Step S200 : If the air conditioner is in cooling mode, determine the range of the temperature T1 of the IPM module 5 .

[0135] Step S300 : controlling the openings of the first throttle element 6 and the second throttle element 7 of the air-conditioning system according to the interval where T1 is located.

[0136] In the above step S300, the interval of T1 includes the following three situations, and correspondingly there are the following three adjustment modes:

[0137] Step S301, when T1 is in the first range: T1 ≥ 90°C, adjust the opening of the first throttling element 6 to 200pls±10pls, adjust the opening of the second throttling element 7 to 200pls±10pls, and keep the opening of the third throttling element 9 at 0.

[0138] Through simulation experiments, when T1 is in the first interval, adjusting the opening of the first throttling element 6 to about 200 pls and adjusting the opening of the second throttling element 7 to about 200 pls can achieve a better cooling effect on the IPM module 5.

[0139] Step S302, when T1 is in the second range: 86℃≤T1<90℃, adjust the opening of the first throttling element 6 to 160pls±10pls, adjust the opening of the second throttling element 7 to 240pls±10pls, and keep the opening of the third throttling element 9 at 0.

[0140] Simulations have shown that when T1 is in the second range, adjusting the opening of the first throttling element 6 to approximately 160 pls and the opening of the second throttling element 7 to approximately 240 pls achieves a better cooling effect on the IPM module 5. As the opening of the first throttling element 6 decreases, the refrigerant flow entering the branch circuit gradually decreases, ensuring sufficient throttling. Conversely, as the opening of the second throttling element 7 increases, the refrigerant flow entering the branch circuit also gradually increases, ensuring more refrigerant for heat dissipation.

[0141] Step S303, when T1 is in the third range: 80°C≤T1<86°C, the opening of the first throttling element 6 is adjusted to 100pls±10pls, the opening of the second throttling element 7 is adjusted to 300pls±10pls, and the opening of the third throttling element 9 is maintained at 0.

[0142] Simulations have shown that when T1 is in the third range, adjusting the opening of the first throttling element 6 to approximately 100 pls and the opening of the second throttling element 7 to approximately 300 pls achieves a better cooling effect on the IPM module 5. As the opening of the first throttling element 6 increases, the refrigerant flow rate entering the branch circuit also gradually increases, ensuring more refrigerant for heat dissipation. Meanwhile, decreasing the opening of the second throttling element 7 allows for full throttling, further reducing the refrigerant temperature and improving heat dissipation.

[0143] In the above step S300, the interval where T1 is located also includes the fourth case:

[0144] In step S304, when T1 is in the fourth range (T1 < 80°C), the opening of the first throttle element 6 remains unchanged, and the opening of the second throttle element 7 is adjusted to 300 pls ± 10 pls. In step S304, regardless of the opening of the first throttle element 6, the existing opening is maintained. Because the control method dynamically adjusts T1 based on real-time detection, when executing step S304, the first throttle element 6 retains its existing opening without any additional adjustment.

[0145] Table 1 Throttle element opening corresponding to IPM module 5 temperature T1

[0146] The three temperature points for the IPM module were chosen based on optimal values ​​obtained through creative work: temperatures above 90°C will affect the service life, and at 100°C, the IPM module may directly burn out. In this paper, 80°C is used as the judgment point for early control and cooling, and 80°C, 86°C, and 90°C are control nodes that increase in steps. When the temperature reaches 86°C, the system needs to adjust the temperature according to the temperature of the IPM module and enhance cooling control; when the temperature reaches 90°C, optimal heat dissipation measures are taken. The reason for adopting step-by-step control is that bypassing subcooler 2 will reduce the cooling / heating effect of the unit, which may result in failure to meet user needs. The use of the above control method can achieve a balance between the unit's operational reliability and comfort.

[0147] During the actual control process, as the temperature of the IPM module 5 becomes higher and higher, the first throttling element 6 gradually opens wider, and the second throttling element 7 gradually opens narrower. Both the first throttling element 6 and the second throttling element 7 use electronic expansion valves. The electronic expansion valve plays the role of throttling, cooling, and reducing pressure in the branch circuit. The first throttling element 6 gradually opens wider to ensure that there is enough refrigerant flowing through, and the second throttling element 7 gradually opens narrower to increase the refrigerant temperature to a lower level, so that a large amount of low-temperature refrigerant can dissipate heat for the IPM. Setting multiple control intervals is to control heat dissipation according to the gradient, because after the first throttling element 6 and the second throttling element 7 are turned on, it will affect the cooling effect of the system. Setting multiple control intervals is to balance the cooling effect and the heat dissipation effect of the IPM module 5. When the temperature of the IPM module 5 does not reach the set value, the cooling effect is prioritized; when the temperature of the IPM module 5 reaches the set value, the heat dissipation effect is prioritized.

[0148] Continue to see Figure 3 Before the above step S100 or step S200, the air conditioning system control method further includes the following steps:

[0149] Step S101 , determining whether the exhaust gas superheat of the compressor 15 of the air-conditioning system is greater than a first set value.

[0150] In step S101, the first set value is 10°C to 14°C (e.g., 12°C). The piping design of this system utilizes refrigerant in the main line to bypass the subcooler 2 for cooling. If the refrigerant bypass is performed before the exhaust temperature reaches the bypass condition, the system's cooling / heating capacity will be insufficient.

[0151] According to the judgment result of step S101, it is decided whether to execute step S200 or step S102.

[0152] If the exhaust gas superheat of the compressor 15 is greater than or equal to the first set value, it means that the working performance of the compressor 15 is good, and then step S200 is executed: determining the interval where T1 is located to perform subsequent temperature reduction control of the IPM module 5.

[0153] If the exhaust gas superheat of compressor 15 is less than the first set value, step S102 is executed: first throttling element 6 and second throttling element 7 are closed. If the exhaust gas superheat of compressor 15 is less than the first set value, it indicates that the performance of compressor 15 is poor. It is necessary to ensure the normal operation of compressor 15. In this case, the IPM module 5 is not cooled.

[0154] If the air conditioning system is in heating mode as determined in step S100, the air conditioning system may have low suction superheat and ice formation in the gas-liquid separator 8. To address the problem of low suction superheat, the following control method can be used:

[0155] In some embodiments, the air conditioning system control method further includes the following steps:

[0156] S400: If the air conditioning system is in the heating mode, determine whether the exhaust gas superheat of the air conditioning system is greater than or equal to a second set value.

[0157] S500: If the exhaust gas superheat of the air conditioning system is greater than or equal to the second set value, determine the range of the intake air superheat T2 of the air conditioning system.

[0158] In the above step S500, the second set value is 23°C to 27°C (for example, 25°C). This temperature can ensure that the compressor can operate reliably, and subsequent control is performed under the premise of the compressor operating reliably.

[0159] S600 , according to the interval where T2 is located, adjusting the openings of the first throttling element 6 and the third throttling element 9 , and closing the second throttling element 7 .

[0160] Referring to Table 2, in some embodiments, when the exhaust gas superheat of the air conditioning system is greater than or equal to the second set value, the interval in which T2 is located is divided into the following four types:

[0161] Step S601, when T2 is within the first suction superheat range: T2 ≤ 1°C, adjust the opening of the first throttling element 6 to 200 pls ± 10 pls, keep the opening of the second throttling element 7 at 0, and adjust the opening of the third throttling element 9 to 200 pls ± 10 pls.

[0162] Step S602, when T2 is within the second suction superheat range: 1°C < T2 ≤ 3°C, adjust the opening of the first throttling element 6 to 240 pls ± 10 pls, keep the opening of the second throttling element 7 at 0, and adjust the opening of the third throttling element 9 to 400 pls ± 10 pls.

[0163] Step S603, when T2 is within the third suction superheat range: 3°C < T2 ≤ 6°C, adjust the opening of the first throttling element 6 to 180 pls ± 10 pls, keep the opening of the second throttling element 7 at 0, and adjust the opening of the third throttling element 9 to 300 pls ± 10 pls.

[0164] Step S604, when T2 is within the fourth suction superheat range: T2 > 6°C, keep the openings of the first throttling element 6, the second throttling element 7, and the third throttling element 9 all at 0.

[0165] Table 2 Throttling element openings corresponding to the suction superheat T2

[0166] Step S700, in some embodiments, if the exhaust superheat of the air conditioning system is less than the second set value and greater than or equal to the third set value, determine the range where T2 is located.

[0167] Step S800, according to the range where T2 is located, adjust the openings of the first throttling element 6 and the third throttling element  9, and close the second throttling element 7.

[0168] Refer to Table 3. In some embodiments, when the exhaust superheat of the air conditioning system is less than the second set value and greater than or equal to the third set value, the ranges where T2 is located are divided into the following four types:

[0169] Step S801, when T2 is within the fifth suction superheat range: T2 ≤ 1°C, adjust the opening of the first throttling element 6 to 120 pls ± 10 pls, keep the opening of the second throttling element 7 at 0, and adjust the opening of the third throttling element 9 to 480 pls ± 10 pls.

[0170] Step S802, when T2 is in the sixth suction superheat range: 1°C < T2 ≤ 3°C, adjust the opening of the first throttle element 6 to 100 pls ± 10 pls, keep the opening of the second throttle element 7 at 0, and adjust the opening of the third throttle element 9 to 400 pls ± 10 pls.

[0171] Step S803, when T2 is in the seventh suction superheat range: 3°C < T2 ≤ 6°C, adjust the opening of the first throttle element 6 to 70 pls, keep the opening of the second throttle element 7 at 0, and adjust the opening of the third throttle element 9 to 300 pls.

[0172] Step S804, when T2 is in the eighth suction superheat range: T2 > 6°C, keep the openings of the first throttle element 6, the second throttle element 7, and the third throttle element 9 all at 0.

[0173] Table 3 Throttle element openings corresponding to the suction superheat T2

[0174] The above control method mainly achieves the regulation effect by bypassing the refrigerant. Therefore, it is necessary to judge whether the discharge superheat reaches the standard before control. To balance reliability and comfort, the discharge superheat is divided into three gradients: greater than 25°C, 12°C - 25°C, and less than 12°C. When the discharge superheat < 12°C, the system gives priority to increasing the discharge superheat; when it is in the range of 12°C - 25°C, although the air-conditioning system has established a certain degree of superheat but it is still insufficient. At this time, the EXV (electronic expansion valve) steps do not adopt the optimal regulation. If the optimal regulation is adopted, it will cause too much bypass refrigerant, which will affect the comfort of the unit. Therefore, it is necessary to appropriately reduce the EXV steps and adopt gradient control.

[0175] Secondly, when the suction superheat < 1°C, it is very likely that the refrigerant returned from the gas-liquid separator 8 to the compressor 15 contains liquid refrigerant. At this time, optimal control intervention is required; when the suction superheat > 6°C, there is basically no risk of liquid return; the control in the range of 1°C - 6°C still adopts the gradient control strategy to balance the system reliability and comfort.

[0176] In the above technical solution, the lower the suction superheat, the first throttle element 6 and the third throttle element 9 gradually open wider. This is to reduce the throttling effect of the two throttle elements, and at the same time let a large amount of refrigerant flow into the gas-liquid separator, increase the temperature of the refrigerant in the accommodation cavity 82 of the gas-liquid separator 8, and increase the suction superheat.

[0177] See Figure 4 which shows the control method after it is judged in Figure 3 Step S400 that the air-conditioning system is in the heating mode. To fully present the control logic, the following description starts from Step S400:

[0178] In the heating mode, the gas-liquid separator 8 of the air-conditioning system may freeze. To reduce or even prevent the gas-liquid separator 8 from freezing, in some embodiments, the air-conditioning system control method further includes the following steps:

[0179] Step S400, if the air-conditioning system is in the heating mode, determine whether the exhaust superheat degree of the air-conditioning system is greater than or equal to a second set value. In some embodiments, the second set value is 23°C to 27°C (such as 25°C).

[0180] Step S900, if the exhaust superheat degree of the air-conditioning system is greater than or equal to the second set value, then determine the interval in which the difference T3 between the inlet pipe temperature and the outlet pipe temperature of the gas-liquid separator 8 of the air-conditioning system is located.

[0181] Step S1000, according to the interval in which T3 is located, adjust the opening degrees of the first throttling element 6 and the third throttling element 9, and close the second throttling element 7.

[0182] In some embodiments, when the exhaust superheat degree of the air-conditioning system is greater than or equal to the second set value, the interval in which T3 is located is divided into the following four types:

[0183] Step S1001, when T3 belongs to the first temperature difference interval: T3 ≤ 0°C, then adjust the opening degree of the first throttling element 6 to 480 pls ± 10 pls, keep the opening degree of the second throttling element 7 at 0, and adjust the opening degree of the third throttling element 9 to 480 pls ± 10 pls.

[0184] Step S1002, when T3 belongs to the second temperature difference interval: 0°C < T3 ≤ 2°C, then adjust the opening degree of the first throttling element 6 to 400 pls ± 10 pls, keep the opening degree of the second throttling element 7 at 0, and adjust the opening degree of the third throttling element 9 to 400 pls ± 10 pls.

[0185] Step S1003, when T3 belongs to the third temperature difference interval: 2°C < T3 ≤ 5°C, then adjust the opening degree of the first throttling element 6 to 300 pls ± 10 pls, keep the opening degree of the second throttling element 7 at 0, and adjust the opening degree of the third throttling element 9 to 300 pls ± 10 pls.

[0186] Step S1004, when T3 belongs to the fourth temperature difference interval: T3 > 5°C, then keep the opening degrees of the first throttling element 6, the second throttling element 7, and the third throttling element 9 at 0 pls.

[0187] Table 4 Throttling element opening degrees corresponding to the temperature difference T3

[0188] Continue to refer to Figure 4 In some embodiments, the air conditioning system control method further includes the following steps:

[0189] Step S1100: On the premise that the exhaust gas superheat degree of the air-conditioning system is less than the second set value, determining whether the exhaust gas superheat degree of the air-conditioning system is greater than or equal to a third set value;

[0190] Step S1200: If the exhaust gas superheat of the air-conditioning system is greater than or equal to the third set value and less than the second set value, determine the interval in which T3 is located.

[0191] Step S1300 , according to the interval where T3 is located, adjust the openings of the first throttling element 6 and the third throttling element 9 of the air conditioning system, and close the second throttling element 7 .

[0192] In some embodiments, when the exhaust gas superheat of the air conditioning system is less than the second set value and greater than or equal to the third set value, the interval in which T3 is located includes the following four types:

[0193] Step S1301, when T3 belongs to the fifth temperature difference range: T3≤0°C, the opening of the first throttling element 6 is adjusted to 400pls±10pls, the opening of the second throttling element 7 is maintained at 0, and the opening of the third throttling element 9 is adjusted to 480pls±10pls.

[0194] Step S1302, when T3 belongs to the sixth temperature difference range: 0℃<T3≤2℃, the opening of the first throttling element 6 is adjusted to 300pls±10pls, the opening of the second throttling element 7 is maintained at 0, and the opening of the third throttling element 9 is adjusted to 400pls±10pls.

[0195] Step S1303, when T3 belongs to the seventh temperature difference range: 2°C<T3≤5°C, the opening of the first throttling element 6 is adjusted to 240pls±10pls, the opening of the second throttling element 7 is maintained at 0, and the opening of the third throttling element 9 is adjusted to 300pls±10pls.

[0196] In some embodiments, when the exhaust superheat of the air-conditioning system is less than the second set value and greater than or equal to the third set value, the interval in which T3 is located also includes the following fourth type: Step S1304, when T3 belongs to the eighth temperature difference interval: T3 is greater than 5°C, then the opening of the first throttling element 6, the opening of the second throttling element 7 and the opening of the third throttling element 9 are all kept at 0.

[0197] The third set value is specifically, for example, 10°C to 14°C. Figure 3 The middle is for control of 25-12° C., and the right side is for control of less than 12° C. When the temperature is less than 12° C., the third throttling element 9 and the second throttling element 7 are both closed, and bypass is prohibited.

[0198] Table 5 Throttling element opening corresponding to temperature difference T3

[0199] In the above technical solution, the smaller the temperature difference between the inlet and outlet pipes of the gas-liquid separator 8, the first throttling element 6 and the third throttling element 9 are gradually opened, in order to reduce the throttling and cooling effect to ensure that there is a large amount of refrigerant to heat the gas-liquid separator 8.

[0200] An embodiment of the present invention provides an air conditioning system control device, including a memory and a processor coupled to the memory, wherein the processor is configured to execute the air conditioning system control method in any one of the aforementioned embodiments based on instructions stored in the memory.

[0201] The memory may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, application programs, a boot loader, and other programs.

[0202] Some embodiments of the present disclosure further provide a computer-readable storage medium having a computer program stored thereon, wherein when the program is executed by a processor, the air conditioning system control method of any of the above embodiments is implemented.

[0203] The processors described herein may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0204] A storage medium can be any available medium that can be accessed by a computer. By way of example and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is also properly referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwaves are included in the definition of medium. As used herein, disks and discs include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks often reproduce data magnetically, while discs reproduce data optically with lasers. The above combinations should also be included within the scope of computer-readable media.

[0205] Those skilled in the art will appreciate that the method embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0206] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0207] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0208] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0209] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0210] In the description of the present invention, each technical feature can be combined with other technical features where feasible.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An air conditioning system, characterized in that: include: Heat exchanger (1); A subcooler (2) comprising a first refrigerant flow channel (21) and a second refrigerant flow channel (22) for exchanging heat with each other; a liquid pipe (3) connected to one end of the first refrigerant flow channel (21) of the subcooler (2), and having an adjustable connection state with one end of the second refrigerant flow channel (22) of the subcooler (2); A control valve (4) comprising a first port (41) and a second port (42); and The IPM module (5) includes a third refrigerant flow channel (51) and a fourth refrigerant flow channel (52) for exchanging heat with each other; The other end of the first refrigerant flow channel (21) of the subcooler (2) is connected to one end of the heat exchanger (1) via the third refrigerant flow channel (51), the other end of the second refrigerant flow channel (22) of the subcooler (2) is connected to one end of the fourth refrigerant flow channel (52) in an adjustable state, and the other end of the fourth refrigerant flow channel (52) is connected to the first port (41) of the control valve (4); the other end of the heat exchanger (1) is connected to the second port (42) of the control valve (4).

2. The air conditioning system according to claim 1, characterized in that Also includes: a first throttling element (6) mounted on an end of the second refrigerant flow channel (22) away from the fourth refrigerant flow channel (52); as well as a second throttling element (7) installed between the second refrigerant flow channel (22) and the fourth refrigerant flow channel (52); The connection state between the second refrigerant flow channel (22) and the fourth refrigerant flow channel (52) is adjusted by the first throttling element (6) and the second throttling element (7).

3. The air conditioning system according to claim 1, characterized in that Also includes: A gas-liquid separator (8), the gas-liquid separator (8) includes a shell (81) and a receiving chamber (82), the shell (81) is provided with a fifth refrigerant flow channel (83); the fifth refrigerant flow channel (83) is constructed to exchange heat with the refrigerant in the receiving chamber (82) and the two are non-connected; one end of the fifth refrigerant flow channel (83) is connected to one end of the second refrigerant flow channel (22) toward the fourth refrigerant flow channel (52), and the other end of the fifth refrigerant flow channel (83) is connected to one end of the fourth refrigerant flow channel (52) toward the second refrigerant flow channel (22).

4. The air conditioning system according to claim 3, characterized in that Also includes: The third throttling element (9) is installed between the second refrigerant flow channel (22) and the fourth refrigerant flow channel (52).

5. The air conditioning system according to claim 1, characterized in that The refrigerant circulation system further includes: compressor (15); An exhaust temperature detection element (10) is installed at the exhaust port of the compressor (15) to detect the exhaust temperature of the compressor (15).

6. The air conditioning system according to claim 5, characterized in that The refrigerant circulation system further includes: An intake temperature detection element (11) is installed at the intake port of the compressor (15) to detect the intake temperature of the compressor (15).

7. The air conditioning system according to claim 3, characterized in that Also includes: A steam inlet pipe temperature detection element (12) is installed at the inlet of the gas-liquid separator (8) to detect the inlet temperature of the gas-liquid separator (8).

8. The air conditioning system according to claim 3, characterized in that The refrigerant circulation system further includes: The steam separation outlet pipe temperature detection element (13) is installed at the outlet of the gas-liquid separator (8) to detect the outlet temperature of the gas-liquid separator (8).

9. A method for controlling an air conditioning system, characterized in that: The air conditioning system according to any one of claims 1 to 8 is used to implement the air conditioning system control method, comprising the following steps: Determine whether the air conditioner is in cooling mode or heating mode; If the air conditioner is in cooling mode, determining the interval in which the temperature T1 of the IPM module (5) is located; According to the interval in which T1 is located, the opening degrees of the first throttling element (6) and the second throttling element (7) of the air conditioning system are controlled.

10. The air conditioning system control method according to claim 9, characterized in that: The interval where T1 is located includes the following three situations: First interval: when the temperature of T1 is greater than or equal to 90°C, the opening of the first throttling element (6) is adjusted to 200 pls, the opening of the second throttling element (7) is adjusted to 200 pls, and the opening of the third throttling element (9) is maintained at 0; Second interval: when the temperature of T1 is greater than or equal to 86°C and less than 90°C, the opening of the first throttling element (6) is adjusted to 160 pls, the opening of the second throttling element (7) is adjusted to 240 pls, and the opening of the third throttling element (9) is maintained at 0; Third interval: when the temperature of T1 is greater than or equal to 80°C and less than 86°C, the opening of the first throttling element (6) is adjusted to 100 pls, the opening of the second throttling element (7) is adjusted to 300 pls, and the opening of the third throttling element (9) is maintained at 0.

11. The air conditioning system control method according to claim 9, characterized in that: The interval where T1 is located also includes the fourth case: Fourth interval: when the temperature of T1 is less than 80°C, the opening of the first throttling element (6) remains unchanged, the opening of the second throttling element (7) is adjusted to 300 pls, and the opening of the third throttling element (9) is maintained at 0.

12. The air conditioning system control method according to claim 9, characterized in that: Before the step of determining the interval in which the temperature T1 of the IPM module (5) is located, the following steps are also included: Determining whether the exhaust gas superheat of the compressor (15) of the air conditioning system is greater than a first set value; If the exhaust gas superheat of the compressor (15) is greater than or equal to a first set value, the interval in which T1 is located is determined; if the exhaust gas superheat of the compressor (15) is less than the first set value, the first throttling element (6) and the second throttling element (7) are closed.

13. The air conditioning system control method according to claim 12, characterized in that: The first set value is 10°C to 14°C.

14. The air conditioning system control method according to claim 9, characterized in that: The following steps are also included: If the air conditioning system is in a heating mode, determining whether the exhaust gas superheat of the air conditioning system is greater than or equal to a second set value; If the exhaust superheat of the air conditioning system is greater than or equal to a second set value, determining the interval of the intake superheat T2 of the air conditioning system; According to the interval in which T2 is located, the opening degrees of the first throttling element (6) and the third throttling element (9) of the air-conditioning system are adjusted, and the second throttling element (7) is closed.

15. The air conditioning system control method according to claim 14, characterized in that: When the exhaust gas superheat of the air conditioning system is greater than or equal to the second set value, the interval of T2 is divided into the following three types: First suction superheat range: when T2 is less than or equal to 1°C, the opening of the first throttling element (6) is adjusted to 200 pls, the opening of the second throttling element (7) is maintained at 0, and the opening of the third throttling element (9) is adjusted to 200 pls; Second suction superheat range: when T2 is less than or equal to 3°C and greater than 1°C, the opening of the first throttling element (6) is adjusted to 240 pls, the opening of the second throttling element (7) is maintained at 0, and the opening of the third throttling element (9) is adjusted to 400 pls; The third intake superheat range: when T2 is less than or equal to 6°C and greater than 3°C, the opening of the first throttling element (6) is adjusted to 180 pls, the opening of the second throttling element (7) is maintained at 0, and the opening of the third throttling element (9) is adjusted to 300 pls.

16. The air conditioning system control method according to claim 14, characterized in that: The second set value is 23°C to 27°C.

17. The air conditioning system control method according to claim 14, characterized in that: If the exhaust gas superheat of the air conditioning system is less than the second set value and greater than or equal to the third set value, determining the interval in which T2 is located; According to the interval in which T2 is located, the opening degrees of the first throttling element (6) and the third throttling element (9) of the air-conditioning system are adjusted, and the second throttling element (7) is closed.

18. The air conditioning system control method according to claim 17, characterized in that: When the exhaust gas superheat of the air conditioning system is less than the second set value and greater than or equal to the third set value, the interval where T2 is located is divided into the following three types: Fourth suction superheat range: when T2 is less than or equal to 1°C, the opening of the first throttling element (6) is adjusted to 120 pls, the opening of the second throttling element (7) is maintained at 0, and the opening of the third throttling element (9) is adjusted to 480 pls; Fifth suction superheat range: when T2 is less than or equal to 3°C and greater than 1°C, the opening of the first throttling element (6) is adjusted to 100 pls, the opening of the second throttling element (7) is maintained at 0, and the opening of the third throttling element (9) is adjusted to 400 pls; Sixth intake superheat range: when T2 is less than or equal to 6°C and greater than 3°C, the opening of the first throttling element (6) is adjusted to 70 pls, the opening of the second throttling element (7) is maintained at 0, and the opening of the third throttling element (9) is adjusted to 300 pls.

19. The air conditioning system control method according to claim 9, characterized in that: The following steps are also included: If the air conditioning system is in a heating mode, determining whether the exhaust gas superheat of the air conditioning system is greater than or equal to a second set value; If the exhaust gas superheat of the air conditioning system is greater than or equal to a second set value, determining the interval in which the difference T3 between the inlet pipe temperature of the gas-liquid separator (8) of the air conditioning system and the outlet pipe temperature of the gas-liquid separator (8) is located; According to the interval in which T3 is located, the opening degrees of the first throttling element (6) and the third throttling element (9) of the air-conditioning system are adjusted, and the second throttling element (7) is closed.

20. The air conditioning system control method according to claim 19, characterized in that: When the exhaust gas superheat of the air conditioning system is greater than or equal to the second set value, the interval of T3 is divided into the following three types: First temperature difference range: if T3 is less than or equal to 0°C, the opening of the first throttling element (6) is adjusted to 480 pls, the opening of the second throttling element (7) is kept at 0, and the opening of the third throttling element (9) is adjusted to 480 pls; Second temperature difference range: if T3 is less than or equal to 2°C and greater than 0°C, the opening of the first throttling element (6) is adjusted to 400 pls, the opening of the second throttling element (7) is kept at 0, and the opening of the third throttling element (9) is adjusted to 400 pls; Third temperature difference range: if T3 is less than or equal to 5°C and greater than 2°C, the opening of the first throttling element (6) is adjusted to 300 pls, the opening of the second throttling element (7) is maintained at 0, and the opening of the third throttling element (9) is adjusted to 300 pls.

21. The air conditioning system control method according to claim 19, characterized in that: The second set value is 23°C to 27°C.

22. The air conditioning system control method according to claim 19, characterized in that: If the exhaust gas superheat of the air conditioning system is less than the second set value and greater than or equal to the third set value, determining the interval in which T3 is located; According to the interval in which T3 is located, the opening degrees of the first throttling element (6) and the third throttling element (9) of the air-conditioning system are adjusted, and the second throttling element (7) is closed.

23. The air conditioning system control method according to claim 22, characterized in that: When the exhaust gas superheat of the air conditioning system is less than the second set value and greater than or equal to the third set value, the interval in which T3 is located includes the following three types: Fifth temperature difference interval: when T3 is less than or equal to 0°C, the opening of the first throttling element (6) is adjusted to 400 pls, the opening of the second throttling element (7) is kept at 0, and the opening of the third throttling element (9) is adjusted to 480 pls; Sixth temperature difference interval: when T3 is less than or equal to 2°C and greater than 0°C, the opening of the first throttling element (6) is adjusted to 300 pls, the opening of the second throttling element (7) is maintained at 0, and the opening of the third throttling element (9) is adjusted to 400 pls; Seventh temperature difference interval: when T3 is less than or equal to 5°C and greater than 2°C, the opening of the first throttling element (6) is adjusted to 240 pls, the opening of the second throttling element (7) is maintained at 0, and the opening of the third throttling element (9) is adjusted to 300 pls.

24. The air conditioning system control method according to claim 22, characterized in that: When the exhaust gas superheat of the air-conditioning system is less than the second set value and greater than or equal to the third set value, the interval in which T3 is located also includes the following fourth type: T3 is in the eighth temperature difference interval: T3 is greater than 5°C, then the opening of the first throttling element (6), the opening of the second throttling element (7) and the opening of the third throttling element (9) are all maintained at 0.

25. An air conditioning system control device, characterized in that: include: Memory; and A processor coupled to the memory, wherein the processor is configured to execute the air conditioning system control method according to any one of claims 9 to 24 based on instructions stored in the memory.

26. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the program is executed by a processor, the air conditioning system control method according to any one of claims 9 to 24 is implemented.

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