Heating control method of air conditioning system and air conditioning system

Abstract

The present application relates to air conditioning technical field, specifically provide a kind of heating control method and air conditioning system of air conditioning system, to solve the problem of compressor low pressure chamber back liquid and gas-liquid separator surface frost of existing air conditioning system.For this purpose, the air conditioning system of the present application includes compressor and gas-liquid separation device in refrigerant circulation main circuit and communicate with each other;The control method of the present application includes: obtaining outdoor environment temperature T;Compare the size of outdoor environment temperature T and preset outdoor environment temperature T1;When T≤T1, judge whether the compressor is short of oil;According to the result of judgment, control gas-liquid separation device selectively enters heating mode or oil supplement mode.The control method of the present application can improve the temperature of refrigerant inside gas-liquid separation device, gas return pressure and heating output, reduce the phenomenon of compressor low pressure chamber back liquid and gas-liquid separation device surface frost.

Description

Technical Field

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

[0002] When an air conditioner operates in heating mode at low temperatures, frost is likely to form due to the low temperature. The higher the relative humidity, the more obvious the frost will be. After the outdoor unit of the air conditioner is frosted, it will easily cause poor heat exchange and reduce the heating capacity.

[0003] In a heat pump air conditioning system, the gas-liquid separator plays a role in separating the refrigerant, ensuring that the refrigerant flowing into the compressor is gaseous. In low-temperature environments, especially in environments with high relative humidity, the surface temperature is low and frost is easily formed. Frost reduces the separation efficiency of the separator, affects the refrigerant flow, and may cause noise problems in the compressor suction chamber. Furthermore, after defrosting, the condensate on the separator surface is prone to freezing when entering the next heating cycle, resulting in low suction pressure. Long-term operation can damage the gas separator and the compressor.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problems of liquid return in the low-pressure chamber of the compressor and frost formation on the surface of the gas-liquid separator in existing air conditioning systems.

[0006] In a first aspect, the present invention provides a heating 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 circuit; the control method includes: acquiring an outdoor ambient temperature T; comparing the outdoor ambient temperature T with a preset outdoor ambient temperature T1; when T≤T1, determining whether the compressor is short of oil; and, based on the determination result, controlling the gas-liquid separator to selectively enter a heating mode or an oil replenishment mode.

[0007] In a specific implementation of the heating control method of the above-mentioned air conditioning system, the step of "determining whether the compressor is short of oil when T≤T1" specifically includes: when T≤T1, obtaining the operating frequency F of the compressor; comparing the operating frequency F of the compressor with the first preset operating frequency F1 and the second preset operating frequency F2; when F1<F<F2, determining whether the compressor is short of oil.

[0008] In a specific implementation of the heating control method for the above-mentioned air conditioning system, the step of "controlling the gas-liquid separation device to selectively enter the heating mode or the oil replenishment mode according to the judgment result" specifically includes: when it is determined that the compressor is not short of oil, controlling the gas-liquid separation device to enter the heating mode.

[0009] In a specific implementation of the heating control method for the above-mentioned air conditioning system, the step of "controlling the gas-liquid separation device to selectively enter the heating mode or the oil replenishment mode according to the judgment result" further includes: when it is determined that the compressor is short of oil, controlling the gas-liquid separation device to enter the oil replenishment mode.

[0010] In a specific embodiment of the heating control method of 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 in the centrifugal separation zone. The heat exchange device of the air conditioning system can selectively connect with the gravity separation zone or the centrifugal separation zone via the valve. When it is determined that the compressor is not short of oil, the heating mode control method specifically includes: controlling the heat exchange device to connect with the gravity separation zone via the valve; controlling the centrifugal separation component to be energized, and controlling the input current supplied to the centrifugal separation component to be less than the operating current.

[0011] In a specific implementation of the heating control method for the above-mentioned air conditioning system, when it is determined that the compressor is short of oil, the control method for the oil replenishment mode specifically includes: controlling the heat exchange device to connect with the centrifugal separation zone via the valve; controlling the centrifugal separation component to be energized, and controlling the input current supplied to the centrifugal separation component to reach the operating current.

[0012] In a specific implementation of the heating control method for the above-mentioned air conditioning system, the control method further includes: when T > T1 or F ≤ F1, controlling the air conditioning system to enter the normal heating mode.

[0013] In a specific implementation of the heating control method for the above-mentioned air conditioning system, the control method for the normal heating mode specifically includes: controlling the heat exchange device to connect with the gravity separation zone via the valve; and controlling the centrifugal separation component to be de-energized.

[0014] In a specific implementation of the heating control method for the above-mentioned air conditioning system, the step of "determining whether the compressor is short of oil" specifically includes: obtaining the oil level of the compressor; determining that the compressor is short of oil when the oil level of the compressor is lower than the preset oil level; and / or determining that the compressor is not short of oil when the oil level of the compressor is higher than the preset oil level.

[0015] In a second aspect, the present invention also provides an air conditioning system including a controller configured to perform the heating control method described above.

[0016] With the above technical solution, the heating control method of the air conditioning system provided by the present invention controls the gas-liquid separator to selectively enter the heating mode or the oil replenishment mode based on the outdoor ambient temperature T, the compressor operating frequency F, and whether the compressor is short of oil. This allows the gas-liquid separator to separate oil during normal operation when the air conditioning system is in low-temperature conditions. In the oil replenishment mode, it can increase the amount of oil returned by the compressor in a short time, reducing the situation of insufficient oil in the compressor. In the heating mode, it can increase the temperature of the refrigerant inside the gas-liquid separator, increase the return gas pressure and heating output, and reduce the phenomenon of liquid return in the low-pressure chamber of the compressor and frost on the surface of the gas-liquid separator. Attached Figure Description

[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0018] Figure 1 This is a schematic diagram of the refrigerant circulation principle of the air conditioning system of the present invention;

[0019] Figure 2 This is a schematic diagram of the gas-liquid separation device in the air conditioning system of the present invention;

[0020] Figure 3 This is a flowchart of the main steps of the heating control method of the air conditioning system of the present invention;

[0021] Figure 4 This is a possible complete flowchart of the heating control method of the air conditioning system of the present invention;

[0022] List of reference numerals in the attached diagram:

[0023] 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

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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 indoor heat exchanger 2, the throttling device 5, the outdoor heat exchanger 4, and the gas-liquid separator 6 to form a heating circulation loop.

[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 outdoor heat exchanger 4 can be 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 uses gravity separation, the liquid and gaseous refrigerant flowing out of the outdoor heat exchanger 4 are mixed with compressor oil. This 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 outdoor heat exchanger 4 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 centrifugal separation, the liquid and gaseous refrigerant flowing out of the outdoor heat exchanger 4 is mixed with compressor oil. This 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. 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. In actual operation, only when compressor 1 is detected to be short of oil, because the amount of compressor oil separated by gravity separation zone 611 is insufficient to meet the oil quantity value for the durable operation of the entire air conditioning system, the compressor oil separated by gravity separation zone 611 will still return to the first oil return port 614, while the second oil return port 624 serves as an oil replenishment port. The compressor oil separated by centrifugal separation zone 621 flows back to the oil suction port of compressor 1 from the second oil return port 624 to meet the oil quantity value for the durable operation of the entire air conditioning system.

[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 and a rotating mechanism. The drive end of the drive mechanism is connected to the rotating mechanism to drive the rotating mechanism to rotate, achieving gas-liquid separation. The drive mechanism is a motor, and the rotating mechanism is an impeller. When the input current of the drive mechanism is less than its starting operating current, the drive mechanism can be considered a heating component. In this case, the drive mechanism does not drive the rotating mechanism to rotate, but it can heat the gas-liquid separation device 6, putting the gas-liquid separation device 6 into heating mode. Only when the input current of the drive mechanism meets its starting operating current will the drive mechanism drive the rotating mechanism to rotate, achieving the purpose of centrifugal separation.

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

[0034] Step S1: Obtain the outdoor ambient temperature T;

[0035] Step S2: Compare the outdoor ambient temperature T with the preset outdoor ambient temperature T1;

[0036] Step S3: When T≤T1, determine whether compressor 1 is short of oil;

[0037] Step S4: Based on the judgment result, control the gas-liquid separation device 6 to selectively enter the heating mode or the oil replenishment mode.

[0038] In step S3, the step of "determining whether the compressor is short of oil when T≤T1" specifically includes:

[0039] Step S31: When T≤T1, obtain the compressor's operating frequency F;

[0040] Step S32: Compare the operating frequency F of the compressor with the magnitudes of the first preset operating frequency F1 and the second preset operating frequency F2;

[0041] Step S33: When F1 < F < F2, determine whether the compressor is short of oil.

[0042] In the above steps, for example, the preset outdoor ambient temperature T1 is 2℃, the first preset operating frequency F1 is 70 Hz, and the second preset operating frequency F2 is 110 Hz. Generally, the operating frequency F of compressor 1 is between 45 and 110 Hz. When the air conditioning system is in heating mode, if the outdoor ambient temperature T≤2℃ and the operating frequency F of compressor 1 is between 70 and 110 Hz, the gas-liquid separator 6 is selectively controlled to enter either heating mode or oil replenishment mode depending on whether compressor 1 is low on oil.

[0043] In step S4, the step of "selectively controlling the gas-liquid separator 6 to enter the heating mode or the oil replenishment mode according to the judgment result" specifically includes:

[0044] Step S41: When it is determined that the compressor 1 is not short of oil, control the gas-liquid separation device 6 to enter the heating mode.

[0045] The specific methods for controlling the heating mode include:

[0046] Step S411: Control the heat exchange device to connect with the gravity separation zone 611 via valve 63;

[0047] Step S412: Control the centrifugal separation component to be energized, and control the input current supplied to the centrifugal separation component to be less than the operating current.

[0048] In the above steps, when compressor 1 is not short of oil, control valve 63 switches to connect with gravity separation zone 611. That is, the refrigerant flowing out of the heat exchange device (i.e., outdoor heat exchanger 4) enters gravity separation zone 611 through the first refrigerant inlet 612 to perform gravity separation of the refrigerant. The separated compressor oil flows back to the oil suction port of compressor 1 through the first oil return port 614, and the separated gaseous refrigerant flows to the suction port of compressor 1 through the first refrigerant outlet 613. However, due to the low outdoor ambient temperature, frost may easily form on the surface of gas-liquid separation device 6, affecting the separation and flow of refrigerant. Furthermore, since refrigerant is prone to turning into liquid in ultra-low temperature environments, this will cause a decrease in the internal pressure of gas-liquid separation device 6, resulting in low suction pressure of compressor 1 and causing liquid return from compressor 1. Therefore, by energizing the centrifugal separation component but with an input current less than the operating current, the centrifugal separation component is only in a heating state and does not work, acting as a heating element to heat the entire chamber of the gas-liquid separation device 6, thereby heating the refrigerant entering the gravity separation zone 611. This can increase the temperature and pressure of the refrigerant in the gas-liquid separation device 6, thereby reducing the return of liquid from the low-pressure chamber of the compressor 1 and the frost formation on the surface of the gas-liquid separation device 6.

[0049] In step S4, the step of "selectively controlling the gas-liquid separator 6 to enter the heating mode or the oil replenishment mode according to the judgment result" further includes:

[0050] Step S42: When it is determined that the compressor 1 is short of oil, the gas-liquid separator 6 is controlled to enter the oil replenishment mode.

[0051] The specific control methods for the fuel replenishment mode include:

[0052] Step S421: Control the heat exchange device to connect with the centrifugal separation zone 621 via valve 63;

[0053] Step S422: Control the centrifugal separation component to be energized, and control the input current supplied to the centrifugal separation component to reach the operating current.

[0054] In the above steps, when compressor 1 is short of oil, control valve 63 switches to connect with centrifugal separation zone 621. This means that the refrigerant flowing from the heat exchange device (i.e., outdoor heat exchanger 4) enters centrifugal separation zone 621 through the second refrigerant inlet 622 for centrifugal separation. The separated compressor oil flows back to the oil suction port of compressor 1 through the second oil return port 624 to replenish the oil in compressor 1. This process continues until compressor 1 is no longer short of oil. Then, the gas-liquid separation device 6 is switched to heating mode, meaning control valve 63 switches to connect with gravity separation zone 611 and the centrifugal separation components are in a heating state. The separated gaseous refrigerant first flows to gravity separation zone 611 through the second refrigerant outlet 623, and then flows to the suction port of compressor 1 through the first refrigerant outlet 613. It should be noted that in actual operation, when compressor 1 is determined to be short of oil, there is generally a delay before switching control valve 63 to connect with centrifugal separation zone 621.

[0055] For example, when compressor 1 is short of oil, compressor 1 controls the gas-liquid separator 6 to enter the oil replenishment mode for 5 minutes every 1 hour of operation, and then controls the gas-liquid separator 6 to switch to the heating mode after 5 minutes. It should be noted that the above-mentioned operating time is only exemplary. In actual operation, those skilled in the art will limit the operating time according to different models of compressor 1 and gas-liquid separator 6, and the present invention does not impose any restrictions on this.

[0056] Furthermore, the step of "determining whether the compressor 1 is short of oil" specifically includes:

[0057] Obtain the oil level of compressor 1;

[0058] When the oil level of compressor 1 is lower than the preset oil level, compressor 1 is judged to be short of oil.

[0059] When the oil level of compressor 1 is higher than the preset oil level, it is determined that compressor 1 is not short of oil.

[0060] For example, the oil level of compressor 1 is detected by setting a liquid level sensor. Of course, those skilled in the art can also use other methods to measure the oil level, as long as they can serve the purpose of oil level detection, and the present invention does not impose any limitations on this.

[0061] The control method of the present invention further includes:

[0062] Step S5: When T > T1 or F ≤ F1, control the air conditioning system to enter normal heating mode.

[0063] The control methods for normal heating mode specifically include:

[0064] The heat exchange device is connected to the gravity separation zone 611 via valve 63;

[0065] The centrifugal separation component is kept off power.

[0066] In the above steps, when the operating frequency F of compressor 1 is ≤ 70 Hz, or when the outdoor ambient temperature T is > 2℃, the air conditioning system is controlled to operate in normal heating mode. At this time, control valve 63 is switched to connect with gravity separation zone 611, and the centrifugal separation component is de-energized. That is, the refrigerant flowing out of the heat exchange device (i.e., outdoor heat exchanger 4) enters gravity separation zone 611 through the first refrigerant inlet 612 to perform gravity separation of the refrigerant. The separated compressor oil flows back to the oil suction port of compressor 1 through the first oil return port 614, and the separated gaseous refrigerant flows to the suction port of compressor 1 through the first refrigerant outlet 613.

[0067] 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 heating control method of the present invention is as follows:

[0068] Step S101: Obtain the outdoor ambient temperature T;

[0069] Step S102: Compare the outdoor ambient temperature T with the preset outdoor ambient temperature T1;

[0070] When T≤T1, execute step S103;

[0071] When T > T1, proceed to step S108;

[0072] Step S103: Obtain the operating frequency F of compressor 1;

[0073] Step S104: Compare the operating frequency F of compressor 1 with the first preset operating frequency F1 and the second preset operating frequency F2;

[0074] When F1 < F < F2, proceed to step S105;

[0075] When F≤F1, proceed to step S108;

[0076] Step S105: Determine if compressor 1 is short of oil;

[0077] If so, proceed to step S106;

[0078] If not, proceed to step S107;

[0079] Step S106: Control the gas-liquid separator 6 to enter the oil replenishment mode;

[0080] Step S107: Control the gas-liquid separation device 6 to enter the heating mode;

[0081] Step S108: Control the air conditioning system to enter normal heating mode.

[0082] The heating control method for an air conditioning system provided by this invention uses the outdoor ambient temperature T, the operating frequency F of the compressor 1, and whether the compressor 1 is short of oil to control the gas-liquid separator 6 to selectively enter the heating mode or the oil replenishment mode. This allows the gas-liquid separator 6 to separate oil during normal operation when the air conditioning system is in low-temperature conditions. In the oil replenishment mode, it can increase the oil return of the compressor 1 for a short time, reducing the situation of insufficient oil in the compressor 1. In the heating mode, it can increase the temperature of the refrigerant inside the gas-liquid separator 6, increase the return gas pressure and heating output, and reduce the return of liquid in the low-pressure chamber of the compressor 1 and the frost formation on the surface of the gas-liquid separator 6.

[0083] Based on the above embodiments, the present invention also provides an air conditioning system, including a controller, the controller being configured to perform the heating control method described above.

[0084] 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 heating control method for an air conditioning system, characterized in that, The air conditioning system includes a compressor and a gas-liquid separator connected to each other in the refrigerant circulation main loop; the gas-liquid separator 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 with 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 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. The control method includes: Obtain the outdoor ambient temperature T; Compare the outdoor ambient temperature T with the preset outdoor ambient temperature T1; When T≤T1, determine whether the compressor is short of oil; Based on the judgment result, the gas-liquid separation device is controlled to selectively enter the heating mode or the oil replenishment mode.

2. The heating control method for an air conditioning system according to claim 1, characterized in that, The step of "determining whether the compressor is short of oil when T≤T1" specifically includes: When T≤T1, obtain the operating frequency F of the compressor; Compare the operating frequency F of the compressor with the magnitudes of the first preset operating frequency F1 and the second preset operating frequency F2; When F1 < F < F2, determine whether the compressor is short of oil.

3. The heating control method for an air conditioning system according to claim 1, characterized in that, The step of "selectively controlling the gas-liquid separation device to enter heating mode or oil replenishment mode based on the judgment result" specifically includes: When it is determined that the compressor is not short of oil, the gas-liquid separation device is controlled to enter the heating mode.

4. The heating 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 enter the heating mode or the oil replenishment mode according to the judgment result" further includes: When it is determined that the compressor is short of oil, the gas-liquid separator is controlled to enter the oil replenishment mode.

5. The heating control method for an air conditioning system according to claim 3, characterized in that, When it is determined that the compressor is not short of oil, the control method for the heating mode specifically includes: The heat exchange device is connected to the gravity separation zone via the valve; The centrifugal separation component is powered on, and the input current supplied to the centrifugal separation component is controlled to be less than the operating current.

6. The heating control method for an air conditioning system according to claim 4, characterized in that, When it is determined that the compressor is short of oil, the control method for the oil replenishment mode specifically includes: The heat exchange device is connected to the centrifugal separation zone via the valve; The centrifugal separation component is powered on, and the input current supplied to the centrifugal separation component is controlled to reach the operating current.

7. The heating control method for an air conditioning system according to claim 5, characterized in that, The control method further includes: When T > T1 or F ≤ F1, the air conditioning system is controlled to enter the normal heating mode.

8. The heating control method for an air conditioning system according to claim 7, characterized in that, The control method for the normal heating mode specifically includes: The heat exchange device is connected to the gravity separation zone via the valve; The centrifugal separation component is kept off power.

9. The heating control method for an air conditioning system according to claim 1, characterized in that, The steps for "determining whether the compressor is low on oil" specifically include: Obtain the oil level of the compressor; When the oil level in the compressor is lower than the preset oil level, it is determined that the compressor is short of oil; and / or When the oil level of the compressor is higher than the preset oil level, it is determined that the compressor is not short of oil.

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

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