Control method, multi-connected air conditioning system and readable storage medium

Abstract

The application discloses a control method, a multi-connected air conditioning system and a readable storage medium. The control method is used for controlling the multi-connected air conditioning system. The multi-connected air conditioning system comprises a first compressor and a second compressor. The type of the first compressor is different from the type of the second compressor. A first outdoor unit comprises a first oil circuit, a second outdoor unit comprises a second oil circuit, a first valve is arranged on the first oil circuit, and a second valve and a third valve are arranged on the second oil circuit. The control method comprises the following steps: according to real-time oil circulation rates of the first compressor and the second compressor, the opening and closing states of the first valve, the second valve and the third valve are controlled. According to the real-time oil circulation rates of the first compressor and the second compressor, the opening and closing states of the first valve, the second valve and the third valve are controlled, so that the oil return and oil distribution effects of the multi-connected air conditioning system can be improved. Different types of the first compressor and the second compressor are arranged, so that the cost of the multi-connected air conditioning system can be reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a control method, a multi-split air conditioning system, and a readable storage medium. Background Technology

[0002] A multi-split air conditioning system consists of multiple outdoor units and multiple indoor units, with the outdoor units connected in parallel. Currently, the most commonly used compressors in multi-split systems are scroll compressors and rotary compressors, which differ in their structural design and oil circulation rate. In multi-split systems involving multiple outdoor units connected in parallel, it is generally required that each outdoor unit use the same compressor; that is, all compressors within the same system must be scroll compressors or all compressors must be rotary compressors. Therefore, ensuring that all compressors in a multi-split air conditioning system have the same structural design and oil circulation rate affects cost control. Summary of the Invention

[0003] The present invention provides a control method, a multi-split air conditioning system, and a readable storage medium to solve at least one of the aforementioned technical problems.

[0004] An embodiment of the present invention provides a control method for a multi-split air conditioning system, characterized in that the multi-split air conditioning system includes a first outdoor unit and a second outdoor unit, the first outdoor unit includes a first compressor, the second outdoor unit includes a second compressor, and the type of the first compressor is different from the type of the second compressor;

[0005] The first compressor and the second compressor are connected in parallel. The first outdoor unit includes a first oil separator and a first oil circuit. The second outdoor unit includes a second oil separator and a second oil circuit. The first oil circuit connects the first oil separator and the first compressor. The second oil circuit connects the second oil separator and the second compressor. The multi-split air conditioning system also includes a first valve, a second valve, and a third valve. The first valve is located on the first oil circuit, and the second valve and the third valve are located on the second oil circuit.

[0006] The control method includes:

[0007] The on / off states of the first valve, the second valve, and the third valve are controlled based on the real-time oil circulation rate of the first compressor and the real-time oil circulation rate of the second compressor.

[0008] In the above control method, by setting up a first compressor and a second compressor of different types in the multi-split air conditioning system, and controlling the opening and closing states of the first valve, the second valve and the third valve according to the real-time oil circulation rate of the first compressor and the second compressor, the flow of lubricating oil in the first oil separator and the second oil separator to the first compressor and the second compressor can be controlled, thereby improving the oil return and oil equalization effect of the multi-split air conditioning system. Setting up different types of first compressors and second compressors can reduce the cost of the multi-split air conditioning system.

[0009] In some embodiments, the first outdoor unit includes a first gas-liquid separator, the second outdoor unit includes a second gas-liquid separator, the first oil circuit includes a first branch, the second oil circuit includes a second branch and a third branch, the first branch is sequentially connected to the first oil separator, the first gas-liquid separator and the first compressor, the second branch is connected to the second oil separator, the second gas-liquid separator and the second compressor, the third branch is connected to the second compressor and the second gas-liquid separator, the first valve is disposed in the first branch, the second valve is disposed in the second branch, and the third valve is disposed in the third branch;

[0010] The control method includes at least one of the following:

[0011] When the real-time oil circulation rate of the first compressor is greater than the real-time oil circulation rate of the second compressor, and the difference between the real-time oil circulation rate of the first compressor and the real-time oil circulation rate of the second compressor is greater than or equal to a preset value, the first valve is controlled to open to connect the first branch, and the second valve is controlled to close and the third valve is controlled to close to disconnect the second branch and the third branch.

[0012] When the real-time oil circulation rate of the second compressor is greater than the real-time oil circulation rate of the first compressor, and the difference between the real-time oil circulation rate of the second compressor and the real-time oil circulation rate of the first compressor is greater than or equal to the preset value, the second valve is controlled to open and the third valve is controlled to open to connect the second branch and the third branch, and the first valve is controlled to close to disconnect the first branch.

[0013] When the difference between the real-time oil circulation rate of the first compressor and the real-time oil circulation rate of the second compressor is less than the preset value, the first valve is controlled to close to disconnect the first branch, and the second valve and the third valve are controlled to close to disconnect the second branch and the third branch.

[0014] In some embodiments, the control method includes:

[0015] Obtain the rotational speed of the first compressor and the rotational speed of the second compressor;

[0016] Based on a preset relationship between compressor speed and oil circulation rate, the real-time oil circulation rate of the first compressor and the real-time oil circulation rate of the second compressor are obtained.

[0017] In some embodiments, the multi-split air conditioning system includes a first oil circuit and a fourth branch circuit, the fourth branch circuit being connected to the first oil separator and the first compressor, and the control method includes:

[0018] When only the first compressor is running in the multi-split air conditioning system, the first valve is controlled to close to disconnect the first branch.

[0019] When the first branch is disconnected, the first oil separator is controlled to connect to the first compressor through the fourth branch.

[0020] In some embodiments, the fourth branch includes a first filter and a first capillary, the first filter being connected to the first capillary, and the control method includes:

[0021] When only the first compressor is running in the multi-split air conditioning system, the first valve is controlled to close.

[0022] With the first valve closed, the first oil separator is controlled to connect to the first compressor through the first filter and the first capillary tube.

[0023] In some embodiments, the second oil circuit further includes a fifth branch, the fifth branch connecting the second oil separator and the second compressor, and the control method includes:

[0024] When only the second compressor is running in the multi-split air conditioning system, the second valve is controlled to close to disconnect the second branch and the third branch.

[0025] In the event that the second branch is disconnected and the third branch is disconnected, the second oil separator is controlled to connect to the second compressor through the fifth branch.

[0026] In some embodiments, the fifth branch includes a second filter and a second capillary, the second filter being connected to the second capillary, and the control method includes:

[0027] When only the second compressor is running in the multi-split air conditioning system, the second valve and the third valve are controlled to close.

[0028] With the second valve and the third valve closed, the second oil separator is controlled to connect to the second compressor through the second filter and the second capillary tube.

[0029] This invention discloses a multi-split air conditioning system, comprising a first outdoor unit and a second outdoor unit. The first outdoor unit includes a first compressor, and the second outdoor unit includes a second compressor. The first compressor and the second compressor are of different types. The multi-split air conditioning system further includes a first valve, a second valve, and a third valve. The first valve is connected to a first branch, and the second valve and the third valve are connected to a second branch. The first branch is located in the first outdoor unit, and the second branch is located in the second outdoor unit. The multi-split air conditioning system also includes a control module electrically connected to the first compressor, the second compressor, the first valve, the second valve, and the third valve.

[0030] The multi-split air conditioning system includes a control module, which is connected to the first outdoor unit and the second outdoor unit. The control module is used for:

[0031] The on / off states of the first valve, the second valve, and the third valve are controlled based on the real-time oil circulation rate of the first compressor and the real-time oil circulation rate of the second compressor.

[0032] A multi-split air conditioning system according to an embodiment of the present invention includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the control method described in any of the above embodiments.

[0033] In the above control method, by setting up a first compressor and a second compressor of different types in the multi-split air conditioning system, and controlling the opening and closing states of the first valve, the second valve and the third valve according to the real-time oil circulation rate of the first compressor and the second compressor, the flow of lubricating oil in the first oil separator and the second oil separator to the first compressor and the second compressor can be controlled, thereby improving the oil return and oil equalization effect of the multi-split air conditioning system. Setting up different types of first compressors and second compressors can reduce the cost of the multi-split air conditioning system.

[0034] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the control method described in any of the above embodiments.

[0035] In the aforementioned computer-readable storage medium, by setting up a first compressor and a second compressor of different types in a multi-split air conditioning system, and controlling the opening and closing states of the first valve, the second valve, and the third valve according to the real-time oil circulation rate of the first compressor and the second compressor, the flow of lubricating oil in the first oil separator and the second oil separator to the first compressor and the second compressor can be controlled, thereby improving the oil return and oil equalization effect of the multi-split air conditioning system. Setting up different types of first compressors and second compressors can reduce the cost of the multi-split air conditioning system.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0038] Figure 1 This is a schematic diagram of the structure of a multi-split air conditioning system according to an embodiment of the present invention;

[0039] Figure 2 This is a flowchart of the control method according to an embodiment of the present invention;

[0040] Figure 3 and Figure 4 This is a schematic diagram showing the relationship between the compressor speed and oil circulation rate according to an embodiment of the present invention;

[0041] Figure 5 and Figure 6 This is a flowchart of the control method according to an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the structure of the first outdoor unit according to an embodiment of the present invention;

[0043] Figure 8 and Figure 9 This is a flowchart of the control method according to an embodiment of the present invention;

[0044] Figure 10 This is a schematic diagram of the structure of the second outdoor unit according to an embodiment of the present invention;

[0045] Figure 11 This is a flowchart of the control method according to an embodiment of the present invention;

[0046] Figure 12 This is a schematic diagram of the modules of a multi-split air conditioning system according to an embodiment of the present invention.

[0047] Figure label:

[0048] A multi-split air conditioning system 300 includes: a first outdoor unit 100, a second outdoor unit 200, a first compressor 10, a second compressor 12, a first oil separator 14, a second oil separator 18, a first valve 22, a second valve 24, a third valve 26, a first gas-liquid separator 28, a second gas-liquid separator 30, a first branch 32, a second branch 34, a third branch 36, a fourth branch 38, a first filter 40, a first capillary tube 42, a fifth branch 44, a second filter 46, a second capillary tube 48, a third filter 50, a third capillary tube 52, a fourth filter 54, a fourth capillary tube 56, a fifth filter 58, a fifth capillary tube 60, a control module 62, and a first four-way valve 64. First outdoor heat exchanger 66, first outdoor fan 68, first heating electronic expansion valve 70, first liquid pipe 72, first gas pipe 74, first oil separator outlet pipe 75, first gas separator inlet pipe 76, first compressor exhaust pipe 78, first compressor suction pipe 80, rotor compressor suction chamber 82, second four-way valve 84, second outdoor heat exchanger 86, second outdoor fan 88, second heating electronic expansion valve 90, second liquid pipe 92, second gas pipe 94, second oil separator outlet pipe 95, second gas separator inlet pipe 96, second compressor exhaust pipe 98, second compressor suction pipe 102, compressor oil discharge pipe 104, main gas pipe 106, main liquid pipe 108, memory 110, processor 112. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] This disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0054] A multi-split air conditioning system consists of multiple outdoor units and multiple indoor units, with the outdoor units connected in parallel. Currently, the most commonly used compressors for the multiple outdoor units in multi-split systems are scroll compressors and rotary compressors, which differ in their structural form and oil circulation rate.

[0055] In related technologies, when a multi-split air conditioning system involves multiple outdoor units connected in parallel, it is usually required that each outdoor unit uses the same compressor. That is, it is required that all compressors in the same system are scroll compressors or all compressors are rotary compressors. Therefore, all compressors in a multi-split air conditioning system have the same structure and oil circulation rate, which affects cost control.

[0056] One embodiment of the present invention provides a control method for a multi-split air conditioning system 300. For example... Figure 1As shown, the multi-split air conditioning system 300 includes a first outdoor unit 100 and a second outdoor unit 200. The first outdoor unit 100 includes a first compressor 10, and the second outdoor unit 200 includes a second compressor 12. The first compressor 10 and the second compressor 12 are of different types.

[0057] The first compressor 10 and the second compressor 12 are connected in parallel. The first outdoor unit 100 includes a first oil separator 14 and a first oil circuit. The second outdoor unit 200 includes a second oil separator 18 and a second oil circuit. The first oil circuit connects the first oil separator 14 and the first compressor 10, and the second oil circuit connects the second oil separator 18 and the second compressor 12. The multi-split air conditioning system 300 also includes a first valve 22, a second valve 24, and a third valve 26. The first valve 22 is located on the first oil circuit, and the second valve 24 and the third valve 26 are located on the second oil circuit. The control method includes:

[0058] The on / off states of the first valve 22, the second valve 24, and the third valve 26 are controlled based on the real-time oil circulation rate of the first compressor 10 and the real-time oil circulation rate of the second compressor 12.

[0059] In the above control method, by setting up a first compressor 10 and a second compressor 12 of different types in the multi-split air conditioning system 300, and controlling the opening and closing states of the first valve 22, the second valve 24 and the third valve 26 according to the real-time oil circulation rate of the first compressor 10 and the second compressor 12, the flow of lubricating oil in the first oil separator 14 and the second oil separator 18 to the first compressor 10 and the second compressor 12 can be controlled, thereby improving the oil return and oil equalization effect of the multi-split air conditioning system 300. Setting up different types of first compressors 10 and second compressors 12 can reduce the cost of the multi-split air conditioning system 300.

[0060] Specifically, a multi-split air conditioning system consists of multiple outdoor units and multiple indoor units, with the outdoor units connected in parallel. The first compressor 10 includes a rotary compressor. The second compressor 12 includes a scroll compressor; that is, the types of the first compressor 10 and the second compressor 12 are different.

[0061] Rotary compressors have an intake chamber for drawing in air, but they do not have an oil drain pipe at the bottom. In contrast, scroll compressors have an oil drain pipe extending from the bottom. When the lubricating oil at the bottom of the scroll compressor accumulates to the outlet of the overflow drain pipe, the scroll compressor can discharge the lubricating oil.

[0062] The function of the oil separator is to separate the lubricating oil from the high-pressure steam discharged from the compressor in order to ensure the cooling effect and the safe and stable operation of the multi-split air conditioning system.

[0063] When the first compressor 10 is a rotary compressor and the second compressor 12 is a scroll compressor, the first oil circuit connects the first oil separator 14 and the rotary compressor. A first valve 22 is installed in the first oil circuit to control its on / off state. The second oil circuit connects the second oil separator 18 and the scroll compressor. A second valve 24 and a third valve 26 are installed in the second oil circuit. Since the scroll compressor includes an oil drain pipe at its bottom, the second oil circuit also connects to the drain pipe. The second valve 24 controls the on / off state between the second oil separator 18 and the scroll compressor, and the third valve 26 controls the on / off state between the oil drain pipe at the bottom of the scroll compressor and the second oil circuit.

[0064] By controlling the on / off states of the first valve 22, the second valve 24, and the third valve 26, the lubricating oil separated in the first oil separator 14 and the second oil separator 18 can be controlled to return to the first compressor 10 and the second compressor 12 in a timely manner, thereby improving the oil return and oil equalization effect of the multi-split air conditioning system 300.

[0065] In one embodiment, the first valve 22, the second valve 24, and the third valve 26 may all include return solenoid valves. Solenoid valves have a simple structure and are easy to install and control.

[0066] Please refer to Figure 2 In some embodiments, the first outdoor unit 100 includes a first gas-liquid separator 28, the second outdoor unit 200 includes a second gas-liquid separator 30, the first oil circuit includes a first branch 32, the second oil circuit includes a second branch 34 and a third branch 36, the first branch 32 is sequentially connected to the first oil separator 14, the first gas-liquid separator 28 and the first compressor 10, the second branch 34 is connected to the second oil separator 18, the second gas-liquid separator 30 and the second compressor 12, the third branch 36 is connected to the second compressor 12 and the second gas-liquid separator 30, a first valve 22 is disposed in the first branch 32, a second valve is disposed in the second branch 34, and a third valve is disposed in the third branch 36; the control method includes at least one of the following:

[0067] Step S103: When the real-time oil circulation rate of the first compressor 10 is greater than the real-time oil circulation rate of the second compressor 12, and the difference between the real-time oil circulation rate of the first compressor 10 and the real-time oil circulation rate of the second compressor 12 is greater than or equal to a preset value, the first valve 22 is opened to connect the first branch 32, and the second valve 24 and the third valve 26 are closed to disconnect the second branch 34 and the third branch 36.

[0068] Step S105: When the real-time oil circulation rate of the second compressor 12 is greater than the real-time oil circulation rate of the first compressor 10, and the difference between the real-time oil circulation rate of the second compressor 12 and the real-time oil circulation rate of the first compressor 10 is greater than or equal to a preset value, control the second valve 24 to open and control the third valve 26 to open to connect the second branch 34 and the third branch 36, and control the first valve 22 to close to disconnect the first branch 32.

[0069] Step S107: When the difference between the real-time oil circulation rate of the first compressor 10 and the real-time oil circulation rate of the second compressor 12 is less than a preset value, control the first valve 22 to close to disconnect the first branch 32, and control the second valve 24 to close and control the third valve 26 to close to disconnect the second branch 34 and the third branch 36.

[0070] In this way, the real-time difference in oil circulation rates between the first compressor 10 and the second compressor 12 can be compared and the opening and closing control can be performed, thereby avoiding the problem of uneven distribution of lubricating oil caused by the discharge of lubricating oil from the compressor.

[0071] Specifically, the multi-split air conditioning system 300 also includes a first gas-liquid separator 28 and a second gas-liquid separator 30. The first gas-liquid separator 28 is connected to the first compressor 10, and the second gas-liquid separator 30 is connected to the second compressor 12.

[0072] The gas-liquid separator protects the compressor by separating and storing the refrigerant liquid in the return pipe. During the process of separating the refrigerant liquid, the lubricating oil is also separated and accumulates at the bottom of the gas-liquid separator. Therefore, there is an oil hole at the outlet pipe and bottom of the gas-liquid separator to ensure that the lubricating oil can return to the compressor, thereby avoiding oil shortage in the compressor.

[0073] When the real-time oil circulation rate of the first compressor 10 is 15% higher than that of the second compressor 12 (scroll compressor), it indicates that the amount of lubricating oil discharged from the first compressor 10 to the first oil separator 14 is high. In this case, the first valve 22 is opened and the second valve 24 and the third valve 26 are closed. The lubricating oil in the first oil separator 14 flows to the first compressor 10 through the first branch 32, which can prevent the lubricating oil from being carried out of the first compressor 10 with the exhaust. Ultimately, this can reduce the difference between the oil circulation rates of the first compressor 10 and the second compressor 12.

[0074] When the real-time oil circulation rate of the second compressor 12 is 15% higher than that of the first compressor 10, it indicates that the amount of lubricating oil discharged from the second compressor 12 to the second oil separator 18 is high. In this case, the second valve 24 and the third valve 26 are opened and the first valve 22 is closed. The lubricating oil in the second oil separator 18 flows to the second compressor 12 from the second branch 34 and the third branch 36, which can prevent it from being carried out of the second compressor 12 with the exhaust gas. Ultimately, this can reduce the difference between the oil circulation rates of the first compressor 10 and the second compressor 12.

[0075] When the difference in real-time oil circulation rate between the outdoor units of the second compressor 12 and the outdoor units of the first compressor 10 is less than 15%, it indicates that the amount of lubricating oil discharged to the corresponding oil separators by the first compressor 10 and the second compressor 12 is low. At this time, the first valve 22, the second valve 24 and the third valve 26 are closed respectively.

[0076] This allows for real-time comparison of the oil circulation rates of the first compressor 10 and the second compressor 12, enabling on / off control. This ensures that the lubricating oil of each outdoor unit can be stored in its own compressor or gas-liquid separator, avoiding uneven distribution of lubricating oil caused by discharge from the outdoor unit.

[0077] In some implementations, the default value is 15%.

[0078] In this way, by limiting the real-time oil circulation difference between the first compressor 10 and the second compressor 12, the problem of uneven distribution of lubricating oil caused by the discharge from the outdoor unit can be avoided.

[0079] Specifically, since compressors of the same type have different structures and oil circulation rates, by limiting the real-time oil circulation rate difference between the first compressor 10 and the second compressor 12, compressors of different types and / or models can achieve better oil return and oil equalization effects, thereby avoiding the problem of uneven distribution of lubricating oil caused by the discharge of the outdoor unit.

[0080] Setting the real-time difference in oil circulation rates between the first compressor 10 and the second compressor 12 to 15% ensures that the difference in oil circulation rates between the two compressors is not too large, thus preventing uneven distribution of lubricating oil. In other embodiments, the preset value can be limited according to the type and / or model of the compressor and the actual usage of the compressor.

[0081] Please refer to Figure 5 In some implementations, the control method includes:

[0082] Step 108: Obtain the rotational speed of the first compressor 10 and the rotational speed of the second compressor 12;

[0083] Step 109: Based on the preset relationship between compressor speed and oil circulation rate, obtain the real-time oil circulation rate of the first compressor 10 and the real-time oil circulation rate of the second compressor 12.

[0084] Thus, by obtaining the real-time speed of the compressor, the real-time oil circulation rate of the first compressor 10 and the second compressor 12 can be obtained, thereby controlling the opening and closing states of the first valve 22, the second valve 24 and the third valve 26 according to the real-time oil circulation rate.

[0085] Specifically, the oil circulation rate of the compressor is related to its rotational speed. In order to obtain the real-time oil circulation rate of the first compressor 10 and the second compressor 12, the real-time rotational speed of the first compressor 10 and the second compressor 12 can be measured, and the real-time oil circulation rate of the compressor can be obtained according to the preset relationship between rotational speed and oil circulation rate.

[0086] The preset relationship between rotational speed and oil circulation rate is related to the compressor model. Figure 3 This is a schematic diagram showing the relationship between the rotational speed and oil circulation rate of different models of rotary compressors. The horizontal axis represents the compressor rotational speed (unit: rps), the vertical axis represents the oil circulation rate (%), and the dashed line and the solid line represent the relationship between the rotational speed and oil circulation rate of different models of rotary compressors, respectively. Figure 4 This diagram illustrates the relationship between the rotational speed and oil circulation rate of a scroll compressor. The horizontal axis represents the compressor rotational speed (rps), and the vertical axis represents the oil circulation rate (%). Solid lines of varying gray levels indicate the relationship between the rotational speed and oil circulation rate for different scroll compressor models. In practical applications, a preset relationship between compressor rotational speed and oil circulation rate can be determined based on the specific compressor model.

[0087] Please refer to Figure 6 and Figure 7 In some embodiments, the first oil circuit further includes a fourth branch 38, which connects the first oil separator 14 and the first compressor 10. The control method includes:

[0088] Step S110: When only the first compressor 10 is running in the multi-split air conditioning system 300, control the first valve 22 to close so that the first branch 32 is disconnected;

[0089] Step S111: When the first branch 32 is disconnected, control the first oil separator 14 to connect to the first compressor 10 through the fourth branch 38.

[0090] Thus, in the case where only the first compressor 10 is running in the multi-split air conditioning system 300, the compressor oil can be returned through the fourth branch 38 to ensure that the lubricating oil of the first compressor 10 is sufficient, thereby ensuring the lubrication performance of the first compressor 10 and not affecting the independent operation of the first compressor 10.

[0091] Specifically, such as Figure 6As shown, in the multi-split air conditioning system 300, the first oil separator 14 is connected to the first compressor suction pipe 80 of the first compressor 10 via the fourth branch 38, and is also connected to the gas-liquid separator and the first compressor suction pipe 80 via the first branch. When only the first compressor 10 is running, the first control valve 22 is closed, which connects the fourth branch 38 and disconnects the first branch, allowing the lubricating oil to directly enter the suction pipe of the first compressor 10.

[0092] Therefore, in the case where only the first compressor 10 is operating in the multi-split air conditioning system 300, other compressors connected in parallel but not in operation do not affect the independent operation of the first compressor 10.

[0093] With the first valve 22 open, the first branch 32 and the fourth branch 38 are connected. Part of the lubricating oil in the first oil separator 14 flows directly to the first compressor 10 through the first branch 32, part of the lubricating oil flows from the first branch 32 to the first compressor 10, and part of the lubricating oil flows from the fourth branch 38 through the first gas-liquid separator 28 to the first compressor 10.

[0094] Please refer to Figure 7 and Figure 8 In some embodiments, the fourth branch 38 includes a first filter 40 and a first capillary 42, the first filter 40 being connected to the first capillary 42, and the control method includes:

[0095] Step S113: When only the first compressor 10 is running in the multi-split air conditioning system 300, control the first valve 22 to close;

[0096] Step S115: With the first valve 22 closed, control the first oil separator 14 to connect to the first compressor 10 through the first filter 40 and the first capillary tube 42.

[0097] This ensures the reliability of lubricating oil return, thereby guaranteeing the reliable operation of the multi-split air conditioning system 300.

[0098] Specifically, when only the first compressor 10 is running in the multi-split air conditioning system 300, the first valve 22 is closed, and the first oil separator 14 is connected to the suction pipe of the first compressor 10 through the first filter 40 and the first capillary tube 42 of the fourth branch 38 to realize the return of oil from the compressor.

[0099] The first filter 40 can filter impurities in the lubricating oil, preventing impurities from clogging the first capillary tube 42, thereby ensuring the reliability of lubricating oil return and thus ensuring the reliable operation of the first compressor 10.

[0100] Please refer to Figure 9 and Figure 10In some embodiments, the second oil circuit further includes a fifth branch 44, which is connected to the second oil separator 18 and the second compressor 12. The control method includes:

[0101] Step S117: When only the second compressor 12 is running in the multi-split air conditioning system 300, control the second valve 24 to close so that the second branch 34 and the third branch 36 are disconnected;

[0102] Step S119: When the second branch 34 and the third branch 36 are disconnected, control the second oil separator 18 to connect to the second compressor 12 through the fifth branch 44.

[0103] Thus, when only the second compressor 12 is running in the multi-split air conditioning system 300, controlling the fifth branch to connect the oil return ensures that the lubricating oil quantity of the second compressor 12 is sufficient, thereby ensuring the lubrication performance of the second compressor 12 and not affecting the independent operation of the second compressor.

[0104] Specifically, in the multi-split air conditioning system 300, the second oil separator 18 is connected to the second compressor suction pipe 102 via the fifth branch, to the second gas-liquid separator 30 via the second branch 34, and to the compressor oil discharge pipe 104 and the second gas-liquid separator 30 via the third branch 36.

[0105] When only the second compressor 12 is running, the second valve 24 and the third valve 26 are closed. At this time, the fifth branch connects the second oil separator 18 and the second gas-liquid separator 30, while the second branch 34 and the third branch 36 are disconnected, allowing lubricating oil to directly enter the suction pipe 102 of the second compressor. Therefore, in the multi-split air conditioning system 300, when only the second compressor 12 is running, other compressors connected in parallel but not in operation do not affect the independent operation of the second compressor 12.

[0106] With the second valve 24 and the third valve 26 open, some of the lubricating oil in the second oil separator 18 flows from the fifth branch 44 to the second compressor 12, and some of the lubricating oil flows from the second branch 34 through the second gas-liquid separator 30 to the second compressor 12. At the same time, the lubricating oil in the compressor oil drain pipe 104 flows through the third branch 36 to the second gas-liquid separator 30.

[0107] Please refer to Figure 10 and Figure 11 In some embodiments, the fifth branch 44 includes a second filter 46 and a second capillary 48, the second filter 46 being connected to the second capillary 48, and the control method includes:

[0108] Step S121: When only the second compressor 12 is running in the multi-split air conditioning system 300, control the second valve 24 to close and the third valve 26 to close;

[0109] Step S123: With the second valve 24 closed and the third valve 26 closed, control the second oil separator 18 to connect to the second compressor 12 through the second filter 46 and the second capillary tube 48.

[0110] This ensures the reliability of lubricating oil return, thereby guaranteeing the reliable operation of the multi-split air conditioning system 300.

[0111] Specifically, when the multi-split air conditioning system 300 is only running with the second compressor 12, the second valve 24 and the third valve 26 are closed, and the second oil separator 18 is connected to the second compressor suction pipe 102 through the second filter 46 and the second capillary tube 48 of the fifth branch 44 to realize compressor oil return.

[0112] The second filter 46 can filter impurities in the lubricating oil, preventing impurities from clogging the second capillary tube 48, thereby ensuring the reliability of lubricating oil return and thus ensuring the reliable operation of the second compressor 12.

[0113] In some embodiments, the first branch 32 includes a third filter 50 and a third capillary tube 52. The third filter 50 is connected to the third capillary tube 52. When the first valve 22 is open, the first oil separator 14 is connected to the first gas-liquid separator 28 through the third filter 50 and the third capillary tube 52. In this way, the lubricating oil in the first branch 32 can be filtered, thereby ensuring the reliability of lubricating oil return and thus ensuring the stable operation of the first compressor 10.

[0114] In some embodiments, the second branch 34 includes a fourth filter 54 and a fourth capillary tube 56. The fourth filter 54 is connected to the fourth capillary tube 56. When the second valve 24 is open, the second oil separator 18 is connected to the second gas-liquid separator 30 through the fourth filter 54 and the fourth capillary tube 56. In this way, the lubricating oil in the second branch 34 can be filtered, thereby ensuring the reliability of lubricating oil return and thus ensuring the stable operation of the second compressor 12.

[0115] In some embodiments, the third branch 36 includes a fifth filter 58 and a fifth capillary tube 60. The fifth filter 58 is connected to the fifth capillary tube 60. When the third valve 26 is open, the compressor oil discharge pipe 104 is connected to the second gas-liquid separator 30 through the fifth filter 58 and the fifth capillary tube 60. In this way, the lubricating oil in the third branch 36 can be filtered, thereby ensuring the reliability of lubricating oil return and thus ensuring the stable operation of the second compressor 12.

[0116] Please refer to Figure 1 , Figure 7 and Figure 10According to an embodiment of the present invention, a multi-split air conditioning system 300 includes a first outdoor unit 100 and a second outdoor unit 200. The first outdoor unit 100 includes a first compressor 10, and the second outdoor unit 200 includes a second compressor 12. The type of the first compressor 10 and the type of the second compressor 12 are different. The multi-split air conditioning system 300 also includes a first valve 22, a second valve 24, and a third valve 26. The first valve 22 is connected to a first branch 32, and the second valve 24 and the third valve 26 are connected to a second branch 34. The first branch 32 is in the first outdoor unit 100, and the second branch 34 is in the second outdoor unit 200. The multi-split air conditioning system 300 also includes a control module 62, which is electrically connected to the first compressor 10, the second compressor 12, the first valve 22, the second valve 24, and the third valve 26.

[0117] The control module 62 is used to control the on / off states of the first valve 22, the second valve 24 and the third valve 26 based on the real-time oil circulation rate of the first compressor 10 and the real-time oil circulation rate of the second compressor 12.

[0118] Specifically, in the illustrated embodiment, the first outdoor unit 100 includes a rotary compressor, and the second outdoor unit 200 includes a scroll compressor.

[0119] like Figure 7 As shown, the first outdoor unit 100 further includes a first four-way valve 64, a first outdoor heat exchanger 66, a first outdoor fan 68, a first heating electronic expansion valve 70, a first liquid pipe 72, a first gas pipe 74, and a first gas distribution inlet pipe 76. The first outdoor fan 68 is installed in the first outdoor heat exchanger 66.

[0120] The rotary compressor includes a first compressor discharge pipe 78, a first compressor suction pipe 80, and a rotary compressor suction chamber 82, the rotary compressor suction chamber 82 being connected to the first compressor suction pipe 80. The first oil separator 14 includes a first oil separator outlet pipe 75.

[0121] The compressor discharge pipe of the rotary compressor is connected to the first oil separator 14. One branch of the oil outlet of the first oil separator 14 is connected to the first gas-liquid separator 28 and the first compressor suction pipe 80, forming the first branch 32. The first valve 22 is located between the first oil separator 14 and the first gas-liquid separator 28. The other branch of the oil outlet of the first oil separator 14 is directly connected to the first compressor suction pipe 80, forming the fourth branch 38.

[0122] The outlet pipe 75 of the first oil separator is connected to one of the first four-way valves 64. The other three of the four-way valves are connected to the first gas pipe 74, the first branch pipe 32 via the first gas inlet pipe 76, and the first outdoor heat exchanger 66, the first heating electronic expansion valve 70, and the first liquid pipe 72 in sequence.

[0123] like Figure 10 As shown, the second outdoor unit 200 also includes a second four-way valve 84, a second outdoor heat exchanger 86, a second outdoor fan, a second heating electronic expansion valve 90, a second liquid pipe 92, a second gas pipe 94, and a second gas inlet pipe 96. The second outdoor fan is installed in the second outdoor heat exchanger 86.

[0124] The scroll compressor includes a second compressor discharge pipe 98, a second compressor suction pipe 102, and a compressor oil discharge pipe 104. One branch 34 connects the oil outlet of the second oil separator 18 to the second gas-liquid separator 30 and the second compressor suction pipe 102; the compressor oil discharge pipe 104 connects to the second gas-liquid separator 30, forming a third branch 36; the other branch 44 connects the oil outlet of the second oil separator 18 to the second compressor suction pipe 102. A second valve 24 is located between the second oil separator 18 and the second gas-liquid separator 30, and a third valve 26 is located between the compressor oil discharge pipe 104 and the second gas-liquid separator 30.

[0125] The outlet pipe 95 of the second oil separator is connected to one of the two four-way valves 84. The other three of the two four-way valves 84 are connected to the second gas pipe 94, the second branch 34 and the third branch 36 through the second gas inlet pipe 96, and the second outdoor heat exchanger 86, the second heating electronic expansion valve 90 and the second liquid pipe 92 in sequence.

[0126] like Figure 1 As shown, the multi-split air conditioning system 300 also includes a main gas pipe 106 and a main liquid pipe 108. The first gas pipe 74 and the second gas pipe 94 are respectively connected to the main gas pipe 106, and the first liquid pipe 72 and the second liquid pipe 92 are respectively connected to the main liquid pipe 108, thereby realizing the parallel connection of two compressors.

[0127] It should be noted that the multi-split air conditioning system 300 of the present invention may also include more than two compressors, wherein all compressors may be of the same type, or the compressors may be of partially different types, or all compressors may be of different types.

[0128] Please refer to Figure 12 A multi-split air conditioning system 300 according to an embodiment of the present invention includes a memory 110 and a processor 112. The memory 110 stores a computer program, and when the processor 112 executes the computer program, it implements the steps of the control method of any of the above embodiments.

[0129] In the above control method, by setting up a first compressor 10 and a second compressor 12 of different types in the multi-split air conditioning system 300, and controlling the opening and closing states of the first valve 22, the second valve 24 and the third valve 26 according to the real-time oil circulation rate of the first compressor 10 and the second compressor 12, the flow of lubricating oil in the first oil separator 14 and the second oil separator 18 to the first compressor 10 and the second compressor 12 can be controlled, thereby improving the oil return and oil equalization effect of the multi-split air conditioning system 300. Setting up different types of first compressors 10 and second compressors 12 can reduce the cost of the multi-split air conditioning system 300.

[0130] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by the processor 112, it implements the steps of the control method of any of the above embodiments.

[0131] In the aforementioned computer-readable storage medium, by setting different types of first compressors 10 and second compressors 12 within the multi-split air conditioning system 300, and controlling the opening and closing states of the first valve 22, the second valve 24, and the third valve 26 based on the real-time oil circulation rate of the first compressor 10 and the second compressor 12, the flow of lubricating oil in the first oil separator 14 and the second oil separator 18 to the first compressor 10 and the second compressor 12 can be controlled. This can improve the oil return and oil equalization effect of the multi-split air conditioning system 300. Setting different types of first compressors 10 and second compressors 12 can reduce the cost of the multi-split air conditioning system 300.

[0132] In one implementation, the control method implemented by the computer program when executed by the processor 112 includes the following steps:

[0133] The on / off states of the first valve 22, the second valve 24, and the third valve 26 are controlled based on the real-time oil circulation rate of the first compressor 10 and the real-time oil circulation rate of the second compressor 12.

[0134] It should be noted that the above explanation of the implementation method and its beneficial effects also applies to the multi-split air conditioning system 300 and the computer-readable storage medium in the embodiments of this application. To avoid redundancy, they will not be elaborated in detail here.

[0135] It is understood that a computer program includes computer program code. Computer program code can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, external hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc. The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0136] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0137] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for a multi-split air conditioning system, characterized in that, The multi-split air conditioning system includes a first outdoor unit and a second outdoor unit. The first outdoor unit includes a first compressor, and the second outdoor unit includes a second compressor. The type of the first compressor is different from the type of the second compressor. The first compressor and the second compressor are connected in parallel. The first outdoor unit includes a first oil separator and a first oil circuit. The second outdoor unit includes a second oil separator and a second oil circuit. The first oil circuit connects the first oil separator and the first compressor. The second oil circuit connects the second oil separator and the second compressor. The multi-split air conditioning system also includes a first valve, a second valve, and a third valve. The first valve is located on the first oil circuit, and the second valve and the third valve are located on the second oil circuit. The control method includes: The on / off states of the first valve, the second valve, and the third valve are controlled based on the real-time oil circulation rate of the first compressor and the real-time oil circulation rate of the second compressor. The first outdoor unit includes a first gas-liquid separator, the second outdoor unit includes a second gas-liquid separator, the first oil circuit includes a first branch, the second oil circuit includes a second branch and a third branch, the first branch is sequentially connected to the first oil separator, the first gas-liquid separator and the first compressor, the second branch is connected to the second oil separator, the second gas-liquid separator and the second compressor, the third branch is connected to the second compressor and the second gas-liquid separator, the first valve is located in the first branch, the second valve is located in the second branch, and the third valve is located in the third branch; The control method includes at least one of the following: When the real-time oil circulation rate of the first compressor is greater than the real-time oil circulation rate of the second compressor, and the difference between the real-time oil circulation rate of the first compressor and the real-time oil circulation rate of the second compressor is greater than or equal to a preset value, the first valve is controlled to open to connect the first branch, and the second valve is controlled to close and the third valve is controlled to close to disconnect the second branch and the third branch. When the real-time oil circulation rate of the second compressor is greater than the real-time oil circulation rate of the first compressor, and the difference between the real-time oil circulation rate of the second compressor and the real-time oil circulation rate of the first compressor is greater than or equal to the preset value, the second valve is controlled to open and the third valve is controlled to open to connect the second branch and the third branch, and the first valve is controlled to close to disconnect the first branch. When the difference between the real-time oil circulation rate of the first compressor and the real-time oil circulation rate of the second compressor is less than the preset value, the first valve is controlled to close to disconnect the first branch, and the second valve and the third valve are controlled to close to disconnect the second branch and the third branch. The control method further includes: Obtain the rotational speed of the first compressor and the rotational speed of the second compressor; Based on a preset relationship between compressor speed and oil circulation rate, the real-time oil circulation rate of the first compressor and the real-time oil circulation rate of the second compressor are obtained.

2. The control method according to claim 1, characterized in that, The multi-split air conditioning system includes a first oil circuit and a fourth branch circuit, the fourth branch circuit being connected to the first oil separator and the first compressor, and the control method includes: When only the first compressor is running in the multi-split air conditioning system, the first valve is controlled to close to disconnect the first branch. When the first branch is disconnected, the first oil separator is controlled to connect to the first compressor through the fourth branch.

3. The control method according to claim 2, characterized in that, The fourth branch includes a first filter and a first capillary tube, the first filter being connected to the first capillary tube, and the control method includes: When only the first compressor is running in the multi-split air conditioning system, the first valve is controlled to close. With the first valve closed, the first oil separator is controlled to connect to the first compressor through the first filter and the first capillary tube.

4. The control method according to claim 1, characterized in that, The second oil circuit further includes a fifth branch, which connects the second oil separator and the second compressor. The control method includes: When only the second compressor is running in the multi-split air conditioning system, the second valve is controlled to close to disconnect the second branch and the third branch. In the event that the second branch is disconnected and the third branch is disconnected, the second oil separator is controlled to connect to the second compressor through the fifth branch.

5. The control method according to claim 4, characterized in that, The fifth branch includes a second filter and a second capillary tube, the second filter being connected to the second capillary tube, and the control method includes: When only the second compressor is running in the multi-split air conditioning system, the second valve and the third valve are controlled to close. With the second valve and the third valve closed, the second oil separator is controlled to connect to the second compressor through the second filter and the second capillary tube.

6. A multi-split air conditioning system, characterized in that, The multi-split air conditioning system is used to execute the control method of any one of claims 1-5. The multi-split air conditioning system includes a first outdoor unit and a second outdoor unit. The first outdoor unit includes a first compressor, and the second outdoor unit includes a second compressor. The type of the first compressor is different from the type of the second compressor. The first compressor and the second compressor are connected in parallel. The multi-split air conditioning system includes a first oil separator, a second oil separator, a first oil circuit, and a second oil circuit. The first oil circuit connects the first oil separator and the first compressor, and the second oil circuit connects the second oil separator and the second compressor. The multi-split air conditioning system also includes a first valve, a second valve, and a third valve. The first valve is disposed on the first oil circuit, and the second valve and the third valve are disposed on the second oil circuit. The multi-split air conditioning system includes a control module, which is electrically connected to the first compressor, the second compressor, the first valve, the second valve, and the third valve. The control module is used for: The on / off states of the first valve, the second valve, and the third valve are controlled based on the real-time oil circulation rate of the first compressor and the real-time oil circulation rate of the second compressor.

7. A multi-split air conditioning system, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the control method according to any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method according to any one of claims 1-5.

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