Air conditioning system control methods and air conditioning systems

Abstract

This invention relates to the field of air conditioning technology, specifically providing a control method and system for an air conditioning system, aiming to solve the problem of delayed compressor oil return in existing air conditioning systems under high-temperature cooling conditions, leading to crankshaft wear. To this end, the air conditioning system includes a compressor and a gas-liquid separator connected in the main refrigerant circulation loop. When the air conditioning system is in cooling mode, the control method of this invention includes: acquiring the outdoor ambient temperature; and, based on the outdoor ambient temperature, controlling the gas-liquid separator to selectively employ centrifugal separation mode and / or gravity separation mode to perform gas-liquid separation of the refrigerant. This invention can switch the gas-liquid separator to use different gas-liquid separation modes for the refrigerant according to different outdoor ambient temperatures, meeting the compressor's oil requirements under high-temperature cooling conditions, improving the compressor oil return rate, ensuring timely compressor oil return, and preventing crankshaft wear.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, specifically providing a control method for an air conditioning system and an air conditioning system. Background Technology

[0002] During normal cooling operation, air conditioning systems typically increase refrigerant circulation by increasing the compressor's operating frequency. Since compressor oil and refrigerant are miscible, increasing the refrigerant circulation rate also increases the compressor's oil return rate. However, during high-temperature cooling operation, due to high outdoor loads, the compressor's operating frequency often decreases due to excessively high discharge pressure. This reduces the compressor's oil return rate, and the high condensing temperature can also lead to delayed oil return during operation, causing crankshaft wear.

[0003] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem of crankshaft wear caused by untimely oil return of the compressor in existing air conditioning systems under high-temperature cooling conditions.

[0005] In a first aspect, the present invention provides a control method for an air conditioning system, the air conditioning system including a compressor and a gas-liquid separator connected to each other in a refrigerant circulation main loop; when the air conditioning system is in a cooling mode, the control method includes: acquiring an outdoor ambient temperature; and controlling the gas-liquid separator to selectively perform gas-liquid separation of the refrigerant using a centrifugal separation mode and / or a gravity separation mode based on the outdoor ambient temperature.

[0006] In a specific implementation of the control method for the above-mentioned air conditioning system, the step of "controlling the gas-liquid separation device to selectively use centrifugal separation mode and / or gravity separation mode to separate the refrigerant from the refrigerant according to the outdoor ambient temperature" specifically includes: when the outdoor ambient temperature is less than or equal to the first preset outdoor ambient temperature, controlling the gas-liquid separation device to use gravity separation mode to separate the refrigerant from the refrigerant.

[0007] In a specific implementation of the control method for the above-mentioned air conditioning system, the step of "controlling the gas-liquid separation device to selectively use centrifugal separation mode and / or gravity separation mode to separate the refrigerant from the refrigerant according to the outdoor ambient temperature" further includes: when the outdoor ambient temperature is greater than a first preset outdoor ambient temperature but less than or equal to a second preset outdoor ambient temperature, controlling the gas-liquid separation device to use gravity separation mode to separate a portion of the refrigerant from the refrigerant, and centrifugal separation mode to separate the refrigerant from the refrigerant from the refrigerant.

[0008] In a specific implementation of the control method for the aforementioned air conditioning system, the step of "controlling the gas-liquid separation device to perform gas-liquid separation in gravity separation mode for a portion of the refrigerant and centrifugal separation mode for another portion of the refrigerant" specifically includes: first controlling the gas-liquid separation device to perform gas-liquid separation in gravity separation mode for a portion of the refrigerant, and then controlling the gas-liquid separation device to perform gas-liquid separation in centrifugal separation mode for another portion of the refrigerant; or controlling the gas-liquid separation device to alternately perform gas-liquid separation in gravity separation mode for a portion of the refrigerant and centrifugal separation mode for another portion of the refrigerant.

[0009] In a specific implementation of the control method for the above-mentioned air conditioning system, the step of "controlling the gas-liquid separation device to selectively use centrifugal separation mode and / or gravity separation mode to separate the refrigerant from the refrigerant according to the outdoor ambient temperature" further includes: when the outdoor ambient temperature is greater than the second preset outdoor ambient temperature, controlling the gas-liquid separation device to use centrifugal separation mode to separate the refrigerant from the refrigerant.

[0010] In a specific embodiment of the control method for the above-mentioned air conditioning system, the gas-liquid separation device includes a first housing, a second housing, a centrifugal separation component, and a valve. The first housing has a first chamber, in which a gravity separation zone is formed. The second housing is disposed within the first chamber, and has a second chamber, in which a centrifugal separation zone is formed. The centrifugal separation component is disposed within the centrifugal separation zone. The heat exchange device of the air conditioning system can selectively connect to the gravity separation zone or the centrifugal separation zone via the valve. The control method for gas-liquid separation of the refrigerant using the gravity separation mode of the gas-liquid separation device specifically includes: controlling the heat exchange device to connect to the gravity separation zone via the valve; and controlling the centrifugal separation component to be de-energized.

[0011] In a specific implementation of the control method for the above-mentioned air conditioning system, the first housing is provided with a first refrigerant inlet, a first refrigerant outlet, and a first oil return port that are connected to the gravity separation zone; "controlling the heat exchange device to connect with the gravity separation zone via the valve" specifically means: controlling the heat exchange device to connect with the first refrigerant inlet via the valve, controlling the first refrigerant outlet to connect with the compressor's suction port, and controlling the first oil return port to connect with the compressor's oil suction port.

[0012] In a specific implementation of the control method for the above-mentioned air conditioning system, the control method for the gas-liquid separation device to perform gas-liquid separation of the refrigerant using a centrifugal separation mode specifically includes: controlling the heat exchange device of the air conditioning system to connect with the centrifugal separation zone via the valve; and controlling the centrifugal separation component to be energized and put into operation.

[0013] In a specific implementation of the control method for the above-mentioned air conditioning system, the second housing is provided with a second refrigerant inlet, a second refrigerant outlet, and a second oil return port that are connected to the centrifugal separation zone; "controlling the compressor to connect with the centrifugal separation zone" specifically means: controlling the heat exchange device to connect with the second refrigerant inlet via the valve, controlling the second refrigerant outlet to connect with the gravity separation zone, and controlling the second oil return port to connect with the oil suction port of the compressor.

[0014] In a second aspect, the present invention also provides an air conditioning system including a controller configured to perform the control method described above.

[0015] When the above technical solution is adopted, the control method of the air conditioning system provided by the present invention can switch the gas-liquid separation device to use different separation modes to separate the refrigerant according to different outdoor ambient temperatures, namely gravity separation mode and / or centrifugal separation mode. Since the mixture of refrigerant and compressor oil is separated by centrifugal separation, the amount of compressor oil returned is larger and the amount of refrigerant separated is smaller compared with gravity separation. Therefore, it can meet the compressor oil demand of the air conditioning system under high temperature cooling conditions, improve the compressor oil return rate, ensure the compressor oil return mechanism, and avoid crankshaft wear. Attached Figure Description

[0016] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0017] Figure 1 This is a schematic diagram of the refrigerant circulation principle of the air conditioning system of the present invention;

[0018] Figure 2 This is a schematic diagram of the gas-liquid separation device in the air conditioning system of the present invention;

[0019] Figure 3 This is a flowchart of the main steps of the control method for the air conditioning system of the present invention;

[0020] Figure 4 This is a possible complete flowchart of the control method of the air conditioning system of the present invention;

[0021] List of reference numerals in the attached diagram:

[0022] 1. Compressor; 2. Indoor heat exchanger; 3. Four-way reversing valve; 4. Outdoor heat exchanger; 5. Throttling device; 6. Gas-liquid separation device; 61. First housing; 611. Gravity separation zone; 612. First refrigerant inlet; 613. First refrigerant outlet; 614. First oil return port; 62. Second housing; 621. Centrifugal separation zone; 622. Second refrigerant inlet; 623. Second refrigerant outlet; 624. Second oil return port; 63. Valve. Detailed Implementation

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0024] It should be noted that in the description of this invention, terms such as "inner" that indicate direction or positional relationship are based on the direction or positional relationship shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the relevant device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Furthermore, it should be noted that although the various steps of the control method of the present invention are described in a specific order in the description of the present invention, these orders are not restrictive. Without departing from the basic principles of the present invention, those skilled in the art can perform the steps in different orders.

[0027] First refer to Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of the refrigerant circulation principle of the air conditioning system of the present invention. Figure 2 This is a schematic diagram of the gas-liquid separation device 6 in the air conditioning system of the present invention. Figure 1 As shown, the air conditioning system includes a compressor 1, a heat exchange device, a gas-liquid separator 6, and a four-way reversing valve 3. The heat exchange device includes an indoor heat exchanger 2, a throttling device 5, and an outdoor heat exchanger 4. By switching the connection mode of the four-way reversing valve 3, the refrigerant passes sequentially through the exhaust port of the compressor 1, the outdoor heat exchanger 4, the throttling device 5, the indoor heat exchanger 2, and the gas-liquid separator 6 to form a refrigeration cycle loop.

[0028] It should be noted that the present invention does not impose any restrictions on the specific structure of the refrigerant circulation main circuit. Those skilled in the art can set it according to actual usage requirements, as long as the refrigerant circulation main circuit is equipped with a compressor 1, an outdoor heat exchanger 4, a throttling device 5, an indoor heat exchanger 2, and a gas-liquid separator 6. Furthermore, the present invention does not impose any restrictions on the specific types of each component. For example, the throttling device 5 can be set as an electronic expansion valve, a thermostatic expansion valve, or a capillary tube, which are not limiting.

[0029] like Figure 2 As shown, the gas-liquid separation device 6 includes a first housing 61, a second housing 62, a centrifugal separation component (not shown in the figure), and a valve 63. The first housing 61 has a first chamber, in which a gravity separation zone 611 is formed. The second housing 62 is disposed in the first chamber, and has a second chamber, in which a centrifugal separation zone 621 is formed. The centrifugal separation component is disposed in the centrifugal separation zone 621. The heat exchange device can selectively communicate with the gravity separation zone 611 or the centrifugal separation zone 621 by means of the valve 63.

[0030] Specifically, the first housing 61 is provided with a first refrigerant inlet 612, a first refrigerant outlet 613, and a first oil return port 614, all connected to the gravity separation zone 611. The indoor heat exchanger 2 is connected to the first refrigerant inlet 612 via a valve 63, the first refrigerant outlet 613 is connected to the suction port of the compressor 1, and the first oil return port 614 is connected to the oil suction port of the compressor 1. When the gas-liquid separation device 6 adopts the gravity separation mode, since the liquid and gaseous refrigerant flowing out of the indoor heat exchanger 2 is mixed with compressor oil, the refrigerant enters the gravity separation zone 611 through the first refrigerant inlet 612. After gravity separation, the compressor oil flows back to the oil suction port of the compressor 1 through the first oil return port 614, and the gaseous refrigerant flows to the suction port of the compressor 1 through the first refrigerant outlet 613. The second housing 62 is provided with a second refrigerant inlet 622, a second refrigerant outlet 623, and a second oil return port 624, which are connected to the centrifugal separation zone 621. The indoor heat exchanger 2 can be connected to the second refrigerant inlet 622 via a valve 63. The second refrigerant outlet 623 is connected to the gravity separation zone 611, and the second oil return port 624 is connected to the oil suction port of the compressor 1. When the gas-liquid separation device 6 adopts the centrifugal separation mode, since the liquid and gaseous refrigerant flowing out of the indoor heat exchanger 2 is mixed with the compressor oil, the refrigerant enters the centrifugal separation zone 621 through the second refrigerant inlet 622. After centrifugal separation, the compressor oil flows back to the oil suction port of the compressor 1 through the second oil return port 624, and the gaseous refrigerant first flows to the gravity separation zone 611 through the second refrigerant outlet 623, and then flows to the air suction port of the compressor 1 through the first refrigerant outlet 613.

[0031] For example, valve 63 is a three-way solenoid valve with one inlet and two outlets. The inlet of valve 63 is connected to the four-way reversing valve 3, and the two outlets of valve 63 are connected to the first refrigerant inlet 612 and the second refrigerant inlet 622, respectively.

[0032] The centrifugal separation assembly includes a drive mechanism (not shown in the figure) and a rotating mechanism (not shown in the figure). The drive end of the drive mechanism is connected to the rotating mechanism to drive the rotating mechanism to rotate, thereby achieving gas-liquid separation. The drive mechanism is a motor, and the rotating mechanism is an impeller.

[0033] See below. Figure 3 This figure is a flowchart of the main steps of the control method for the air conditioning system of the present invention. Figure 3 As shown, when the air conditioning system is in cooling mode, the control method of the present invention includes the following steps:

[0034] S1, obtain the outdoor ambient temperature;

[0035] S2, based on the outdoor ambient temperature, the gas-liquid separation device 6 selectively employs centrifugal separation mode and / or gravity separation mode to perform gas-liquid separation of the refrigerant.

[0036] Specifically, in step S2, the step of "controlling the gas-liquid separation device 6 to selectively use centrifugal separation mode and / or gravity separation mode to separate the refrigerant from the refrigerant according to the outdoor ambient temperature" includes the following steps:

[0037] S21, when the outdoor ambient temperature is less than or equal to the first preset outdoor ambient temperature, the gas-liquid separation device 6 is controlled to use gravity separation mode to separate the refrigerant into gas and liquid.

[0038] S22, when the outdoor ambient temperature is greater than the first preset outdoor ambient temperature but less than or equal to the second preset outdoor ambient temperature, the gas-liquid separation device 6 is controlled to use gravity separation mode to separate gas and liquid for a portion of the refrigerant and centrifugal separation mode to separate gas and liquid for the other portion of the refrigerant.

[0039] S23, when the outdoor ambient temperature is higher than the second preset outdoor ambient temperature, the gas-liquid separation device 6 is controlled to use centrifugal separation mode to separate the refrigerant into gas and liquid.

[0040] Furthermore, the control method for gas-liquid separation of the refrigerant using gravity separation mode in the gas-liquid separation device 6 specifically includes:

[0041] The heat exchange device is connected to the gravity separation zone 611 via valve 63;

[0042] The centrifugal separation component is kept off power.

[0043] Specifically, "controlling the heat exchange device to connect with the gravity separation zone 611 via valve 63" means controlling the heat exchange device to connect with the first refrigerant inlet 612 via valve, controlling the first refrigerant outlet 613 to connect with the compressor suction port, and controlling the first oil return port 614 to connect with the compressor oil suction port.

[0044] Furthermore, the control method for gas-liquid separation of the refrigerant using centrifugal separation mode in the gas-liquid separation device 6 specifically includes:

[0045] The heat exchange device is connected to the centrifugal separation zone 621 via valve 63;

[0046] Control the centrifugal separation component to power on and operate.

[0047] Specifically, "connecting the compressor 1 to the centrifugal separation zone 621" means:

[0048] The heat exchange device is controlled to connect with the second refrigerant inlet 622 via valve 63, the second refrigerant outlet 623 is controlled to connect with the gravity separation zone 611, and the second oil return port 624 is controlled to connect with the oil suction port of compressor 1.

[0049] In the above steps, for example, the first preset outdoor ambient temperature is 35°C and the second preset outdoor ambient temperature is 40°C. It should be noted that the present invention does not impose any restrictions on the specific values ​​of the first preset outdoor ambient temperature and the second preset outdoor ambient temperature; those skilled in the art can set them according to actual usage requirements.

[0050] Specifically, in step S21, when the outdoor ambient temperature is less than or equal to 35°C, the refrigerant in the system circulates normally, the centrifugal separation component is not powered, and the mixture of refrigerant and compressor oil flowing out of the indoor heat exchanger 2 does not flow through the centrifugal separation component. Instead, it is connected to the first refrigerant inlet 612 via valve 63, so that the mixture of refrigerant and compressor oil enters the gravity separation zone 611, and the separated compressor oil returns to the compressor 1 through the first oil return port 614.

[0051] In step S22, when the outdoor ambient temperature is greater than 35℃ but less than or equal to 40℃, the refrigerant in the system circulates normally, the centrifugal separation component is energized and operates, and the mixture of refrigerant and compressor oil flowing out of the indoor heat exchanger 2 enters the gravity separation zone 611 via valve 63. At this time, the indoor heat exchanger 2 is connected to the first refrigerant inlet 612 via valve 63, and the other part enters the centrifugal separation zone 621. At this time, the indoor heat exchanger 2 is connected to the second refrigerant inlet 622 via valve 63, so that part of the separated compressor oil returns to the compressor 1 via the first oil return port 614, and the other part returns to the compressor 1 via the second oil return port 624. In actual operation, when the refrigerant uses gravity separation mode for gas-liquid separation, the centrifugal separation component is in standby mode. In addition, the ratio of refrigerant using gravity separation mode or centrifugal separation mode is adjusted according to the model of the centrifugal separation component.

[0052] In step S23, when the outdoor ambient temperature is greater than 40°C, the discharge pressure of compressor 1 is higher due to the higher outdoor ambient temperature. At this time, the system will reduce the operating frequency of compressor 1. As a result, the demand for refrigerant is weaker and the demand for compressor oil is larger. Therefore, in order to ensure the demand for compressor oil, the centrifugal separation component is energized and operates. The mixture of refrigerant and compressor oil flowing out of indoor heat exchanger 2 enters the centrifugal separation zone 621 through valve 63. That is, indoor heat exchanger 2 is connected to the second refrigerant inlet 622 through valve 63, so that the separated compressor oil returns to compressor 1 through the second oil return port 624.

[0053] Furthermore, in step S22, the step of "controlling the gas-liquid separation device 6 to perform gas-liquid separation using gravity separation mode for a portion of the refrigerant and centrifugal separation mode for the other portion of the refrigerant" specifically includes:

[0054] S221, first control the gas-liquid separation device 6 to perform gas-liquid separation on a portion of the refrigerant using gravity separation mode, then control the gas-liquid separation device 6 to perform gas-liquid separation on another portion of the refrigerant using centrifugal separation mode.

[0055] It should be noted that, in addition to the steps of "first gravity separation mode, then centrifugal separation mode" described above, it can also be "first controlling the gas-liquid separation device 6 to use centrifugal separation mode for a portion of the refrigerant, and then controlling the gas-liquid separation device 6 to use gravity separation mode for the other portion of the refrigerant." The above adjustments are also within the scope of protection of this invention.

[0056] In an alternative embodiment, step S22, which involves "controlling the gas-liquid separation device 6 to perform gas-liquid separation using gravity separation mode for a portion of the refrigerant and centrifugal separation mode for the other portion of the refrigerant," specifically includes:

[0057] S2211, the gas-liquid separation device 6 alternately performs gas-liquid separation by using gravity separation mode for one part of the refrigerant and centrifugal separation mode for another part of the refrigerant.

[0058] See below. Figure 4 This paper describes one possible control flow of the present invention. For example... Figure 4 As shown, a possible complete flow of the control method of the present invention is as follows:

[0059] S101, Obtain the outdoor ambient temperature T;

[0060] S102, compare the outdoor ambient temperature T with the first preset outdoor ambient temperature T1 and the second outdoor ambient temperature T2 respectively;

[0061] When T≤T1, execute step S103;

[0062] When T1 < T ≤ T2, execute step S104;

[0063] When T > T2, proceed to step S105;

[0064] S103, the gas-liquid separation device 6 is controlled to use gravity separation mode to separate the refrigerant into gas and liquid;

[0065] S104, the gas-liquid separation device 6 is controlled to use gravity separation mode to separate gas and liquid for a portion of the refrigerant, and centrifugal separation mode to separate gas and liquid for another portion of the refrigerant;

[0066] S105, the gas-liquid separation device 6 is controlled to use centrifugal separation mode to separate the refrigerant into gas and liquid.

[0067] The control method for the air conditioning system provided by this invention can switch the gas-liquid separation device 6 to use different separation modes to separate the refrigerant according to different outdoor ambient temperatures, namely gravity separation mode and / or centrifugal separation mode. Since the mixture of refrigerant and compressor oil is separated by centrifugal separation, the amount of compressor oil returned is larger than that separated by gravity separation, while the amount of refrigerant separated is smaller. Therefore, it can meet the compressor oil demand of the air conditioning system under high temperature cooling conditions, improve the oil return rate of compressor 1, ensure timely oil return of compressor 1, and avoid crankshaft wear.

[0068] Based on the above embodiments, the present invention also provides an air conditioning system, including a controller configured to perform the control method described above. Those skilled in the art will understand that the present invention does not impose any limitations on the specific structure and model of the controller, and the controller can be the original controller of the air conditioning system, or it can be a controller separately configured to execute the control method of the present invention. Those skilled in the art can customize the structure and model of the controller according to actual usage requirements.

[0069] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles 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 such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that, The air conditioning system includes a compressor and a gas-liquid separator that are connected to each other in the main refrigerant circulation loop; The gas-liquid separation device includes a first housing, a second housing, a centrifugal separation component, and a valve. The first housing has a first chamber with a gravity separation zone formed therein. The second housing is disposed within the first chamber and has a second chamber with a centrifugal separation zone formed therein. The centrifugal separation component is disposed within the centrifugal separation zone. The heat exchange device of the air conditioning system can selectively communicate with either the gravity separation zone or the centrifugal separation zone via the valve. The first housing is provided with a first refrigerant inlet, a first refrigerant outlet, and a first oil return port communicating with the gravity separation zone. The second housing is provided with a second refrigerant inlet, a second refrigerant outlet, and a second oil return port communicating with the centrifugal separation zone. When the air conditioning system is in cooling mode, the control method includes: Obtain the outdoor ambient temperature; Based on the outdoor ambient temperature, the gas-liquid separation device is controlled to selectively employ centrifugal separation mode and / or gravity separation mode to separate the refrigerant into gas and liquid components.

2. The control method for the air conditioning system according to claim 1, characterized in that, The step of "controlling the gas-liquid separation device to selectively employ centrifugal separation mode and / or gravity separation mode to perform gas-liquid separation of the refrigerant according to the outdoor ambient temperature" specifically includes: When the outdoor ambient temperature is less than or equal to the first preset outdoor ambient temperature, the gas-liquid separation device is controlled to use gravity separation mode to separate the refrigerant into gas and liquid.

3. The control method for the air conditioning system according to claim 1, characterized in that, The step of "controlling the gas-liquid separation device to selectively employ centrifugal separation mode and / or gravity separation mode to perform gas-liquid separation of the refrigerant according to the outdoor ambient temperature" further includes: When the outdoor ambient temperature is greater than the first preset outdoor ambient temperature but less than or equal to the second preset outdoor ambient temperature, the gas-liquid separation device is controlled to perform gas-liquid separation using gravity separation mode for a portion of the refrigerant and gas-liquid separation using centrifugal separation mode for the other portion of the refrigerant.

4. The control method for an air conditioning system according to claim 3, characterized in that, The steps of "controlling the gas-liquid separation device to perform gas-liquid separation using gravity separation mode for a portion of the refrigerant and centrifugal separation mode for the other portion of the refrigerant" specifically include: First, control the gas-liquid separation device to perform gas-liquid separation using gravity separation mode for a portion of the refrigerant; then control the gas-liquid separation device to perform gas-liquid separation using centrifugal separation mode for the other portion of the refrigerant; or The gas-liquid separation device is controlled to alternately perform gas-liquid separation using gravity separation mode for one part of the refrigerant and centrifugal separation mode for another part of the refrigerant.

5. The control method for an air conditioning system according to claim 1, characterized in that, The step of "controlling the gas-liquid separation device to selectively employ centrifugal separation mode and / or gravity separation mode to perform gas-liquid separation of the refrigerant according to the outdoor ambient temperature" further includes: When the outdoor ambient temperature is greater than the second preset outdoor ambient temperature, the gas-liquid separation device is controlled to use centrifugal separation mode to separate the refrigerant into gas and liquid.

6. The control method for an air conditioning system according to any one of claims 1-5, characterized in that, The control method for gas-liquid separation of refrigerant using gravity separation mode in the gas-liquid separation device specifically includes: The heat exchange device is connected to the gravity separation zone via the valve; The centrifugal separation component is kept off power.

7. The control method for an air conditioning system according to claim 6, characterized in that, "Controlling the heat exchange device to connect with the gravity separation zone via the valve" specifically means: The heat exchange device is controlled to connect with the first refrigerant inlet via the valve, the first refrigerant outlet is controlled to connect with the compressor suction port, and the first oil return port is controlled to connect with the compressor oil suction port.

8. The control method for an air conditioning system according to claim 6, characterized in that, The control method for gas-liquid separation of the refrigerant using centrifugal separation mode in the gas-liquid separation device specifically includes: The heat exchange device controlling the air conditioning system is connected to the centrifugal separation zone via the valve; The centrifugal separation component is powered on and put into operation.

9. The control method for an air conditioning system according to claim 8, characterized in that, "Controlling the connection between the compressor and the centrifugal separation zone" specifically means: The heat exchange device is controlled to connect with the second refrigerant inlet via the valve, the second refrigerant outlet is controlled to connect with the gravity separation zone, and the second oil return port is controlled to connect with the oil suction port of the compressor.

10. An air conditioning system, comprising a controller configured to perform the control method of any one of claims 1 to 9.

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