Oil return control method and air conditioning system

Abstract

The invention discloses an oil return control method and an air conditioning system. The air conditioning system comprises a compressor, an outdoor unit assembly, an indoor unit assembly and a gas-liquid separator, an exhaust pipe of the compressor is connected with an input port of the outdoor unit assembly, an output port of the outdoor unit assembly is connected with an input port of the indoor unit assembly, and an output port of the indoor unit assembly is connected with the gas-liquid separator; at least part of an air suction pipe of the compressor is located in the gas-liquid separator, an oil return hole is formed in the air suction pipe, and a stirring motor is arranged at the bottom of the gas-liquid separator. The method comprises the steps that a corresponding control strategy is executed based on the current working condition of the compressor, the control strategy at least comprises the step of controlling a stirring motor so that the compressor can reach the target working condition, and under the target working condition, the current lubricating oil index parameter of the compressor meets the requirement of normal operation of the compressor. Therefore, rapid oil return can be achieved through the stirring motor, abrasion caused by oil shortage of the compressor is avoided, and then the operation safety of the compressor is improved conveniently.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning systems, and more specifically, to an oil return control method and an air-conditioning system. Background Art

[0002] In order to improve the working efficiency and safety of the compressor, air conditioning systems often use lubricating oil to assist the operation of the compressor. However, during the operation of the compressor, some of the lubricating oil will be discharged from the compressor along with the refrigerant and enter the system condenser, piping, and evaporator. If the lubricating oil discharged from the compressor cannot return to the compressor, it may cause the compressor to lack oil, wear, and fail. Summary of the invention

[0003] Embodiments of the present application provide an oil return control method and an air conditioning system.

[0004] The oil return control method of the embodiment of the present application is applied to an air-conditioning system, the air-conditioning system includes a compressor, an outdoor unit component, an indoor unit component and a gas-liquid separator, the exhaust pipe of the compressor is connected to the input port of the outdoor unit component, the output port of the outdoor unit component is connected to the input port of the indoor unit component, and the output port of the indoor unit component is connected to the gas-liquid separator; at least part of the suction pipe of the compressor is located in the gas-liquid separator, the suction pipe is provided with an oil return hole, and a stirring motor is provided at the bottom of the gas-liquid separator, the method includes: executing a corresponding control strategy based on the current operating condition of the compressor, the control strategy at least includes controlling the stirring motor so that the compressor reaches a target operating condition, under the target operating condition, the current lubricating oil index parameters of the compressor meet the requirements of the normal operation of the compressor.

[0005] The air conditioning system of the embodiment of the present application includes a compressor, an outdoor unit component, an indoor unit component, a gas-liquid separator, a processor, a memory and a computer program. The exhaust pipe of the compressor is connected to the input port of the outdoor unit component, the output port of the outdoor unit component is connected to the input port of the indoor unit component, and the output port of the indoor unit component is connected to the gas-liquid separator; at least part of the suction pipe of the compressor is located in the gas-liquid separator, the suction pipe is provided with an oil return hole, and the bottom of the gas-liquid separator is provided with a stirring motor. The computer program is stored in the memory and executed by the processor, and the computer program includes instructions for executing the oil return control method. The oil return control method includes executing a corresponding control strategy based on the current working condition of the compressor, and the control strategy at least includes controlling the stirring motor so that the compressor reaches the target working condition. Under the target working condition, the current lubricating oil index parameters of the compressor meet the requirements of the normal operation of the compressor.

[0006] In the oil return control method and air conditioning system of the embodiment of the present application, a stirring motor is provided in the gas-liquid separator, and the stirring motor can be used to improve the mutual dissolution efficiency of liquid refrigerant and lubricating oil to avoid stratification of the two. The current working condition can be used to reflect whether the compressor is short of oil. During the operation of the air conditioning system, the corresponding control strategy can be executed based on the current working condition, wherein the control strategy at least includes controlling the stirring motor. For example, in the case of oil shortage in the compressor, the stirring motor can be controlled to operate, so as to utilize the stirring motor to increase the possibility of lubricating oil entering the oil return hole and entering the compressor, thereby improving the oil return efficiency, so that after the stirring motor is operated, the compressor can quickly reach the target operating condition to ensure that the compressor can operate safely. In the case that the compressor is not short of oil, the stirring motor can be controlled to stop operating. In this way, the present application can control the operation of the stirring motor in a targeted manner according to the current working condition, so that in the case of insufficient lubrication effect and oil shortage in the compressor, the stirring motor can be used to achieve rapid oil return, so as to improve the lubrication effect of the lubricating oil on the compressor as soon as possible, thereby avoiding the wear caused by oil shortage in the compressor, and then facilitating the improvement of the operating safety of the compressor.

[0007] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0009] Figure 1 is a schematic diagram of the structure of an air conditioning system according to certain embodiments of the present application;

[0010] Figure 2 is a flow chart of an oil return control method according to certain embodiments of the present application;

[0011] Figure 3 is a flow chart of an oil return control method according to certain embodiments of the present application;

[0012] Figure 4 is a flow chart of an oil return control method according to certain embodiments of the present application;

[0013] Figure 5 is a flow chart of an oil return control method according to certain embodiments of the present application;

[0014] Figure 6 is a flow chart of an oil return control method according to certain embodiments of the present application;

[0015] Figure 7 is a flow chart of an oil return control method according to certain embodiments of the present application;

[0016] Figure 8 is a flow chart of an oil return control method according to certain embodiments of the present application;

[0017] Fig. 9 is a flow chart of an oil return control method according to certain embodiments of the present application;

[0018] Fig.10 is a flow chart of an oil return control method according to certain embodiments of the present application;

[0019] Fig.11 is a flow chart of an oil return control method according to certain embodiments of the present application;

[0020] Fig.12 is a module schematic diagram of an oil return control device in certain embodiments of the present application;

[0021] Fig.13 is a partial structural schematic diagram of an air conditioning system according to certain embodiments of the present application;

[0022] Fig.14 It is a schematic diagram of the connection status of a non-volatile computer-readable storage medium and a processor in certain embodiments of the present application.

[0023] Description of main component symbols:

[0024] 100. Air conditioning system;

[0025] 10. Compressor; 11. Intake pipe; 111. Oil return hole; 12. Oil level sensor; 20. Outdoor unit assembly; 21. Outdoor unit; 22. Fan; 30. Indoor unit assembly; 31. Indoor unit; 32. Electronic expansion valve; 40. Gas-liquid separator; 41. Stirring motor; 50. Oil separator; 60. Four-way valve; 70. Regulating valve. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as limiting the embodiments of the present application.

[0027] In order to improve the working efficiency and safety of the compressor, air conditioning systems often use lubricating oil to assist the operation of the compressor. However, during the operation of the compressor, some of the lubricating oil will be discharged from the compressor along with the refrigerant and enter the system condenser, piping, and evaporator. If the lubricating oil discharged from the compressor cannot return to the compressor, it may cause the compressor to lack oil and wear and fail. Especially in multi-split systems, there are a large number of indoor units, long installation pipelines, large refrigerant filling volume, and large drop. The lubricating oil discharged from the compressor is easily retained in the pipeline and cannot return to the compressor, which makes the compressor prone to oil shortage.

[0028] Common oil return methods include oil return from the oil separator, oil return from the oil return hole of the gas-liquid separator, and oil return at fixed time. For the oil return from the oil return hole of the gas-liquid separator, due to the large amount of refrigerant charged in the air-conditioning system, when only the indoor unit is turned on or the minimum load is used for cooling, the liquid level of the gas-liquid separator is relatively high. Due to the inconsistent density of the lubricating oil and the liquid refrigerant, the lubricating oil is often on top of the liquid refrigerant and stratified, but the oil return hole of the gas-liquid separator is at the bottom of the gas-liquid separator, resulting in more liquid refrigerant returning to the compressor through the oil return hole, making the oil return efficiency of the gas-liquid separator extremely poor, and the compressor lubricating oil is diluted by the refrigerant, losing its lubrication effect, which in turn causes the compressor to lack oil, wear and fail.

[0029] In order to solve the above problems, the embodiment of the present application provides an oil return control method, which will be described in detail below:

[0030] See also Figure 1 and Figure 2 The embodiment of the present application provides an oil return control method, which is applied to an air conditioning system 100. The air conditioning system 100 includes a compressor 10, an outdoor unit assembly 20, an indoor unit assembly 30 and a gas-liquid separator 40. The exhaust pipe of the compressor 10 is connected to the input port of the outdoor unit assembly 20, the output port of the outdoor unit assembly 20 is connected to the input port of the indoor unit assembly 30, and the output port of the indoor unit assembly 30 is connected to the gas-liquid separator 40; at least part of the suction pipe 11 of the compressor 10 is located in the gas-liquid separator 40, the suction pipe 11 of the compressor 10 is provided with an oil return hole 111, and a stirring motor 41 is provided at the bottom of the gas-liquid separator 40. The oil return control method includes:

[0031] Step 011: Execute a corresponding control strategy based on the current operating condition of the compressor 10. The control strategy at least includes controlling the stirring motor 41 so that the compressor 10 reaches a target operating condition. Under the target operating condition, the current lubricating oil index parameters of the compressor 10 meet the requirements for normal operation of the compressor 10.

[0032] Specifically, the compressor 10 is a core component of the air conditioning refrigeration system, which is mainly responsible for compressing and transmitting refrigerant vapor. It releases the energy in the refrigerant in the form of heat by changing the state of the refrigerant (from gaseous to liquid), thereby achieving a cooling effect. The outdoor unit assembly 20 includes an outdoor unit 21 and a fan 22. The outdoor unit 21 is mainly responsible for transferring the indoor heat to the outdoor environment through the refrigerant, and dissipating the heat in the refrigerant into the atmosphere through the condenser. The fan 22 helps the outdoor unit 21 to dissipate heat by accelerating the air flow, thereby ensuring the effective operation of the air conditioning system 100. The indoor unit assembly 30 includes an indoor unit 31 and an electronic expansion valve 32 corresponding to the indoor unit 31. The indoor unit 31 is mainly responsible for absorbing the indoor heat and transferring it to the outdoor unit 21 through the refrigerant, and at the same time, the refrigerant is converted from liquid to gaseous through the evaporator. In this process, a large amount of heat will be absorbed, thereby achieving the effect of indoor cooling. The electronic expansion valve 32 can automatically adjust the flow and pressure of the refrigerant according to the indoor temperature and pressure signal to ensure the normal operation of the air conditioning system 100. The gas-liquid separator 40 is mainly used to separate and store the liquid portion of the refrigerant to prevent the liquid refrigerant from directly entering the compressor 10 and causing liquid hammer.

[0033] The exhaust pipe of the compressor 10 is connected to the input port of the outdoor unit assembly 20, the output port of the outdoor unit assembly 20 is connected to the input port of the indoor unit assembly 30, and the output port of the indoor unit assembly 30 is connected to the gas-liquid separator 40. At least part of the suction pipe 11 of the compressor 10 is located in the gas-liquid separator 40, and the part of the suction pipe 11 of the compressor 10 located in the gas-liquid separator 40 is "U"-shaped, and the bottom of the suction pipe 11 of the compressor 10 is provided with an oil return hole 111, and the top of the suction pipe 11 of the compressor 10 is provided with an air hole, through which the gaseous refrigerant can enter the suction pipe 11 of the compressor 10. The gaseous refrigerant can move in the suction pipe 11 of the compressor 10, resulting in a pressure difference between the inside of the suction pipe 11 of the compressor 10 and the inside of the gas-liquid separator 40. Under the action of the pressure difference, the liquid refrigerant and lubricating oil in the gas-liquid separator 40 enter the oil return hole 111 and re-enter the compressor 10 along the suction pipe 11 of the compressor 10. A stirring motor 41 is provided at the bottom of the gas-liquid separator 40. The stirring motor 41 can be used to stir the liquid refrigerant and the lubricating oil to improve the mutual dissolution efficiency of the liquid refrigerant and the lubricating oil and prevent the two from being separated into layers.

[0034] At this time, after the mixture of lubricating oil and refrigerant is discharged from the exhaust pipe of the compressor 10, it can be moved to the outdoor unit assembly 20 for heat exchange. After passing through the outdoor unit assembly 20, the mixture of lubricating oil and refrigerant will enter the indoor unit assembly 30. After the action of the indoor unit assembly 30, the liquid refrigerant will evaporate into a gaseous refrigerant. When only the indoor unit is started or the refrigeration is performed at a relatively small load, the evaporation efficiency is low, and some liquid refrigerant cannot evaporate, resulting in the refrigerant discharged from the indoor unit assembly 30 being a gaseous refrigerant, or a liquid refrigerant and a gaseous refrigerant. At the same time, the lubricating oil will move to the gas-liquid separator 40 with the refrigerant. In the gas-liquid separator 40, the gaseous refrigerant can return to the compressor 10 through the suction pipe 11 of the compressor 10, and the liquid refrigerant and lubricating oil can enter the suction pipe 11 of the compressor 10 through the oil return hole 111, and enter the compressor 10. It should be noted that the diameter of the oil return hole 111 is usually small, and the amount of liquid entering the oil return hole 111 is usually small, so even if the lubricating oil and liquid refrigerant enter the compressor 10 through the oil return hole 111 and the suction pipe 11 of the compressor 10, no liquid hammer phenomenon will occur. In this way, the oil return of the lubricating oil can be achieved.

[0035] In some embodiments, the air conditioning system 100 further includes an oil separator 50 and a four-way valve 60. The oil separator 50 is located on the exhaust side of the compressor 10. Its main function is to effectively intercept the lubricating oil in the exhaust gas and return it to the compressor 10 to ensure the recycling of the lubricating oil, so as to reduce the deposition of the lubricating oil in other parts of the system, prevent system blockage and thermal scaling problems, and thus improve the performance of the entire refrigeration system. The four-way valve 60 is an important control component in the air conditioning system 100, which is mainly used to change the flow direction of the refrigerant and realize the switching of the cooling and heating functions.

[0036] The exhaust pipe of the compressor 10 is connected to the input port of the oil separator 50; the first output port of the oil separator 50 is connected to the four-way valve 60, and is connected to the input port of the outdoor unit assembly 20 through the four-way valve 60, and the second output port of the oil separator 50 is connected to the suction pipe 11 of the compressor 10; the output port of the indoor unit assembly 30 is connected to the four-way valve 60, and is connected to the gas-liquid separator 40 through the four-way valve 60. At this time, the movement route of the lubricating oil in the air conditioning system 100 is as follows: after the mixture of lubricating oil and refrigerant is discharged from the exhaust pipe of the compressor 10, it will move to the oil separator 50 for separation of refrigerant and lubricating oil, wherein most of the lubricating oil will be separated and returned to the compressor 10 through the second output port of the oil separator 50. A small amount of lubricating oil that has not been separated will move to the four-way valve 60 through the first output port of the oil separator 50 together with the refrigerant, and then move to the outdoor unit assembly 20 through the four-way valve 60 for heat exchange. After passing through the outdoor unit assembly 20, the mixture of lubricating oil and refrigerant will enter the indoor unit assembly 30. At the same time, the lubricating oil moves to the four-way valve 60 along with the refrigerant, and moves to the gas-liquid separator 40 through the four-way valve 60. In the gas-liquid separator 40, the gaseous refrigerant can return to the compressor 10 through the suction pipe 11 of the compressor 10, while the liquid refrigerant and the lubricating oil can enter the suction pipe 11 of the compressor 10 through the oil return hole 111 and enter the compressor 10.

[0037] Among them, the stirring motor 41 can be used to promote the mutual dissolution of liquid refrigerant and lubricating oil and avoid their stratification, so as to increase the possibility of lubricating oil entering the oil return hole 111, thereby improving the oil return efficiency and avoiding the stratification of liquid refrigerant and lubricating oil, resulting in more liquid refrigerant entering the oil return hole 111, thereby avoiding oil shortage in the compressor 10 and improving the operating stability of the compressor 10.

[0038] The lubricating oil index parameter may include at least one of an oil level and an oil release rate, wherein the oil release rate refers to the proportion of lubricating oil in the oil tank of the compressor 10, and the oil level refers to the height of the liquid in the oil tank. The preset oil level threshold and the preset oil release rate threshold may be set according to the requirements of the normal operation of the compressor 10, the preset oil level threshold is determined according to the oil level when the compressor 10 can operate safely, and the preset oil release rate threshold is determined according to the oil level being the preset oil level threshold and the oil release rate when the lubrication effect of the liquid in the oil tank is better.

[0039] The current operating condition can be determined by the current lubricating oil index parameter of the compressor 10. For example, the compressor 10 may include an oil level sensor 12, and the oil level sensor 12 can be used to obtain the current oil level and the current oil release rate of the compressor 10. The current oil level and the current oil release rate of the compressor 10 are obtained according to the oil level sensor 12, and the current operating condition can be determined according to the preset oil level threshold, the preset oil release rate threshold, the current oil level and the current oil release rate. The current operating condition includes the case where the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, the case where the current oil level is greater than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, the case where the current oil level is less than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, and the case where the current oil level is less than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold.

[0040] Therefore, the current operating condition can be used to reflect whether the compressor 10 is short of oil and whether the lubricating effect of the lubricating oil is sufficient, that is, whether the current lubricating oil index parameters of the compressor 10 meet the requirements of the normal operation of the compressor 10. Under the target operating condition, the current lubricating oil index parameters of the compressor 10 meet the requirements of the normal operation of the compressor 10, so that the compressor 10 can operate normally under the target operating condition. Therefore, the corresponding control strategy is executed based on the current operating condition of the compressor 10, and the control strategy at least includes controlling the stirring motor 41 so that the compressor 10 reaches the target operating condition. Among them, the control method of the stirring motor 41 may be different under different operating conditions.

[0041] For example, when the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, it can be confirmed that the compressor 10 is not short of oil, and the current operating condition of the compressor 10 is the target operating condition. At this time, even if only a small amount of lubricating oil in the gas-liquid separator 40 returns to the compressor 10, it will not affect the operation of the compressor 10. Therefore, the stirring motor 41 can be controlled to stop running to reduce unnecessary losses of the stirring motor 41.

[0042] For another example, when the current operating condition is that the current oil level is greater than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, it can be considered that the lubricating effect of the lubricating oil is insufficient. At this time, it is necessary to obtain more lubricating oil from the gas-liquid separator 40. Therefore, the stirring motor 41 can be controlled to operate to increase the possibility of the lubricating oil entering the oil return hole 111 and improve the oil return efficiency. After the stirring motor 41 is running, the lubricating oil index parameters of the compressor 10 can rise rapidly until the current lubricating oil index parameters of the compressor 10 meet the requirements of the normal operation of the compressor 10, so that the operating condition of the compressor 10 can quickly reach the target operating condition.

[0043] When controlling the operation of the stirring motor 41, the operating power of the stirring motor 41 can be determined according to the size of the lubricating oil index parameter. Taking the lubricating oil index parameter as the oil level as an example, the mapping relationship between the oil level and the operating power of the stirring motor 41 can be pre-set, and the smaller the oil level, the greater the corresponding operating power of the stirring motor 41. Later, when controlling the operation of the stirring motor 41, the operating power of the stirring motor 41 can be determined based on the mapping relationship, so that the energy consumption of the stirring motor 41 can be reduced as much as possible while ensuring that the oil level of the compressor 10 can quickly rise to the preset oil level threshold. Alternatively, the stirring motor 41 can also be directly controlled to run at maximum power to maximize the stirring efficiency of the stirring motor 41, so that the oil level of the compressor 10 can quickly rise to the preset oil level threshold.

[0044] The gas-liquid separator 40 of the oil return control method of the embodiment of the present application is provided with a stirring motor 41, and the stirring motor 41 can be used to improve the mutual dissolution efficiency of the liquid refrigerant and the lubricating oil to avoid stratification of the two. The current operating condition can be used to reflect whether the compressor 10 is short of oil. During the operation of the air-conditioning system 100, the corresponding control strategy can be executed based on the current operating condition, wherein the control strategy at least includes controlling the stirring motor 41. For example, in the case where the compressor 10 is short of oil, the stirring motor 41 can be controlled to operate, so as to utilize the stirring motor 41 to increase the possibility of the lubricating oil entering the oil return hole 111 and entering the compressor 10, thereby improving the oil return efficiency, so that after the stirring motor 41 is running, the compressor 10 can quickly reach the target operating condition to ensure that the compressor 10 can operate safely. In the case that the compressor 10 is not short of oil, the stirring motor 41 can be controlled to stop operating. In this way, the present application can control the operation of the stirring motor 41 in a targeted manner according to the current working conditions, so that when the lubrication effect is insufficient and the compressor 10 is short of oil, the stirring motor 41 can be used to achieve rapid oil return, so as to improve the lubrication effect of the lubricating oil on the compressor 10 as soon as possible, thereby avoiding the wear caused by the lack of oil in the compressor 10, and further facilitating the improvement of the operating safety of the compressor 10.

[0045] See also Figure 1 and Figure 3 In some embodiments, step 011: executing a corresponding control strategy based on the current working condition of the compressor 10, the control strategy at least includes controlling the stirring motor 41, including:

[0046] Step 0111: Based on the preset mapping relationship and the current operating condition, the target operating parameters corresponding to the current operating condition are obtained to control the operation of the stirring motor 41 according to the target operating parameters. The preset mapping relationship is used to characterize the corresponding operating parameters under different operating conditions.

[0047] Specifically, a preset mapping relationship can be set according to the operating parameters of the stirring motor 41 when the compressor 10 can achieve rapid oil return under different working conditions, and the preset mapping relationship is used to characterize the corresponding operating parameters under different working conditions. For example, the operating parameters may include an operating gear or a rotation speed, and when the current gear shows that the compressor 10 is more short of oil, the operating gear or the rotation speed is greater. During the operation of the air-conditioning system 100, the target operating parameters can be determined based on the preset mapping relationship and the current working conditions, and the operation of the stirring motor 41 can be controlled according to the target operating parameters, so as to ensure that the compressor 10 can achieve rapid oil return on the one hand, and reduce the energy consumption of the stirring motor 41 on the other hand.

[0048] In one embodiment, the operating parameters include operating gears, and the compressor 10 can operate in multiple operating gears. The preset mapping relationship includes a first mapping relationship, and the first mapping relationship is used to characterize the corresponding operating gears under different working conditions. It can be understood that the larger the gear, the greater the stirring power of the stirring motor 41. According to the oil shortage corresponding to different working conditions, the power of different operating gears, and the operating gear corresponding to the stirring motor 41 when the compressor 10 can achieve rapid oil return under different working conditions, the operating gear corresponding to different working conditions is set to generate a first mapping relationship. For example, the operating gear can be set to three gears, and the oil shortage can be divided into mild oil shortage, moderate oil shortage and severe oil shortage. The corresponding oil shortage can be determined according to the lubricating oil index parameters corresponding to different working conditions, wherein the gear corresponding to mild oil shortage is the first gear, the gear corresponding to moderate oil shortage is the second gear, and the gear corresponding to severe oil shortage is the third gear. During the operation of the air-conditioning system 100, the target operating gear corresponding to the current working condition can be obtained based on the first mapping relationship and the current working condition, and then the stirring motor 41 is controlled to operate according to the target operating gear.

[0049] In another embodiment, the operating parameters include a rotational speed, and the compressor 10 can operate at multiple rotational speeds. The preset mapping relationship includes a second mapping relationship, and the second mapping relationship is used to characterize the corresponding rotational speeds under different operating conditions. It can be understood that the greater the rotational speed, the greater the stirring power of the stirring motor 41. According to the oil shortage corresponding to different operating conditions, and the corresponding rotational speed of the stirring motor 41 when the compressor 10 can achieve rapid oil return under different operating conditions, the rotational speed corresponding to different operating conditions is set to generate a second mapping relationship. During the operation of the air-conditioning system 100, the target rotational speed corresponding to the current operating condition can be obtained based on the second mapping relationship and the current operating condition, and the operation of the stirring motor 41 can be controlled according to the target rotational speed.

[0050] In this way, during the operation of the air-conditioning system 100, the corresponding target operating parameters can be determined according to the preset mapping relationship and the current operating conditions, so that after the stirring motor 41 operates according to the target operating parameters, the compressor 10 can achieve rapid oil return. At the same time, the energy consumption of the stirring motor 41 can be reduced, so that the stirring motor 41 does not need to operate at maximum power under each operating condition.

[0051] See also Figure 1 and Figure 4 In some embodiments, when the current operating condition is that the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the preset oil release rate threshold, step 011: executing the corresponding control strategy based on the current operating condition of the compressor 10, including:

[0052] Step 0112: Control the stirring motor 41 to stop running;

[0053] Step 0113: Control the compressor 10, the outdoor unit assembly 20 and the indoor unit assembly 30 to maintain the current operating parameters.

[0054] Specifically, when the current operating condition is that the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the preset oil release rate threshold, it can be considered that the compressor 10 is not short of oil and the lubricating effect of the lubricating oil is better. At this time, the low oil return efficiency will not affect the normal operation of the compressor 10, so the stirring motor 41 can be controlled to stop running to reduce the energy consumption of the stirring motor 41. At the same time, the compressor 10, the oil separator 50, the four-way valve 60, the outdoor unit assembly 20 and the indoor unit assembly 30 can all maintain the current operating parameters without special operations, thereby ensuring that the cooling effect of the entire air-conditioning system 100 meets the current demand.

[0055] See also Figure 1 and Figure 5 In some embodiments, the stirring motor 41 includes a plurality of operating gears. When the current operating condition is that the current oil level is greater than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, step 011: executing the corresponding control strategy based on the current operating condition of the compressor 10, including:

[0056] Step 0114: Control the stirring motor 41 to operate at a preset operating gear;

[0057] Step 0115: reducing the speed of the compressor 10 according to a preset adjustment ratio;

[0058] Step 0116: reducing the opening degree of the electronic expansion valve 32 of the indoor unit assembly 30 in the open state according to the first adjustment value;

[0059] Step 0117: Maintain the operating state of the indoor unit assembly 30 in the closed state.

[0060] Specifically, the stirring motor 41 may include multiple operating gears, such as the third gear, the fourth gear, or the seventh gear. The larger the operating gear, the greater the stirring power of the stirring motor 41. In the current working condition, when the current oil level is greater than the preset oil level threshold, and the current oil release rate is less than the preset oil release rate threshold, it is considered that the lubricating effect of the lubricating oil is insufficient, and the liquid refrigerant content in the compressor 10 is relatively high.

[0061] In the case where the lubricating effect of the lubricating oil is insufficient, the compressor 10 will have a certain risk of damage, and the rotation speed of the compressor 10 affects the amount of refrigerant sucked in. The greater the rotation speed, the greater the amount of refrigerant sucked in. Therefore, at this time, the rotation speed of the compressor 10 can be reduced according to the preset adjustment ratio, for example, the preset adjustment ratio is 80%, and the rotation speed of the compressor 10 is reduced to 80% of the current rotation speed, so as to reduce the amount of refrigerant sucked in on the one hand, and reduce the risk of damage to the compressor 10 on the other hand. At the same time, the stirring motor 41 can also be controlled to run at a preset operating gear, and the preset operating gear can be the operating gear corresponding to the larger stirring power, for example, the largest operating gear, or the second largest operating gear, so as to quickly improve the mutual dissolution efficiency of the refrigerant and the lubricating oil, thereby facilitating the rapid improvement of the oil return efficiency. The low oil release rate can be considered that there is too much liquid refrigerant in the gas-liquid separator 40. Therefore, at this time, the opening of the electronic expansion valve 32 of the indoor unit assembly 30 in the open state can be reduced according to the first adjustment value. For example, the opening of the electronic expansion valve 32 of the open indoor unit 31 can be reduced by 40 steps. At the same time, the operating state of the indoor unit assembly 30 in the closed state is maintained, that is, the operating state of the indoor unit assembly 30 in the closed state is maintained in the closed state, so as to reduce the flow rate of the liquid refrigerant flowing into the indoor unit assembly 30, so that the indoor unit assembly 30 can fully evaporate the liquid refrigerant, and ensure that the refrigerant flowing out of the indoor unit assembly 30 is gaseous, thereby reducing the amount of liquid refrigerant flowing into the gas-liquid separator 40, which is convenient for improving the oil release rate of the gas-liquid separator 40.

[0062] In this way, when the current operating condition is that the current oil level is greater than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, that is, when the oil release rate is low, the operating states of the stirring motor 41, the compressor 10 and the indoor unit assembly 30 can be adjusted accordingly, so as to improve the oil release rate and the oil return efficiency under the joint action of the stirring motor 41, the compressor 10 and the indoor unit assembly 30, thereby avoiding the wear caused by long-term lack of oil in the compressor 10, and further facilitating the improvement of the operating safety of the compressor 10.

[0063] See also Figure 1 and Figure 6 In some embodiments, the stirring motor 41 includes a plurality of operating gears. When the current operating condition is that the current oil level is less than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, and when the current operating condition is that the current oil level is less than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, step 011: executing the corresponding control strategy based on the current operating condition of the compressor 10, including:

[0064] Step 0118: Control the stirring motor 41 to operate according to the preset operating gear;

[0065] Step 0119: Control the compressor 10 to run according to a preset speed;

[0066] Step 0120: Control the opening degree of the electronic expansion valve 32 of the indoor unit assembly 30 according to the first preset opening degree.

[0067] Specifically, the preset speed is a fixed oil return speed, which can be calculated based on the flow rate of the refrigerant when the gaseous refrigerant can drive the lubricating oil in the pipeline to quickly move to the gas-liquid separator 40. The first preset opening is the opening of the electronic expansion valve 32 when the refrigerant can quickly pass through the indoor unit assembly 30. For example, the first preset opening can be the maximum opening of the electronic expansion valve 32.

[0068] In the case where the current operating condition is that the current oil level is less than the preset oil level threshold, and the current oil release rate is greater than the preset oil release rate threshold, it can be considered that the compressor 10 is short of oil at this time, and it can be considered that there is more lubricating oil retained in the pipeline or more lubricating oil stored in the gas-liquid separator 40. In the case where the current operating condition is that the current oil level is less than the preset oil level threshold, and the current oil release rate is less than the preset oil release rate threshold, it can be considered that the compressor 10 is short of oil and the oil release rate is low at this time, and it can be considered that there is more lubricating oil retained in the pipeline or more lubricating oil stored in the gas-liquid separator 40, and the content of liquid refrigerant in the gas-liquid separator 40 is relatively high.

[0069] In the above two cases, the compressor 10 can be controlled to run according to a preset speed to ensure that the lubricating oil in the pipeline can be quickly moved to the gas-liquid separator 40. Then, the opening of the electronic expansion valve 32 of the indoor unit assembly 30 can be controlled according to the first preset opening to increase the flow rate of the refrigerant flowing in the pipeline, and further ensure that the lubricating oil in the pipeline can be quickly driven by the refrigerant to the gas-liquid separator 40. It should be noted that at this time, the opening of the indoor unit assembly 30 in the open state and the opening of the indoor unit assembly 30 in the closed state can be controlled at the same time to increase the flow rate of the refrigerant flowing in the pipeline as much as possible. At the same time, the stirring motor 41 can also be controlled to run at a preset operating gear to quickly improve the mutual dissolution efficiency of the refrigerant and the lubricating oil, so as to facilitate the rapid improvement of the oil return efficiency.

[0070] In this way, the flow rate and flow rate of the refrigerant in the pipeline can be increased by controlling the compressor 10 and the electronic expansion valve 32, ensuring that the lubricating oil in the pipeline can be quickly moved to the gas-liquid separator 40, thereby facilitating the improvement of the oil release rate. At the same time, the operation of the stirring motor 41 can improve the oil return efficiency, so as to increase the flow rate of the liquid delivered from the gas-liquid separator 40 to the compressor 10, especially the flow rate of the lubricating oil, and ensure that the oil level and the oil release rate of the compressor 10 can quickly rise to the corresponding threshold value, thereby avoiding the wear caused by the long-term lack of oil in the compressor 10, and thus facilitating the improvement of the operating safety of the compressor 10.

[0071] See also Figure 1 and Figure 7In some embodiments, after step 011: executing a corresponding control strategy based on the current operating condition of the compressor 10, the oil return control method further includes:

[0072] Step 013: When the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, the electronic expansion valve 32 of the compressor 10 and the indoor unit assembly 30 is controlled to return to the operating state before the control strategy is executed;

[0073] Step 015: gradually reduce the operating gear according to the current oil release rate and the preset oil release rate threshold until the stirring motor 41 stops running.

[0074] Specifically, after the control strategy corresponding to the current working condition is implemented, the current oil level and the current oil release rate can be detected in real time. When the current oil level is less than the preset oil level threshold, or the current oil release rate is less than the preset oil release rate threshold, the compressor 10, the indoor unit assembly 30 and the stirring motor 41 can continue to be controlled according to the control strategy to increase the current oil level or the current oil release rate as soon as possible.

[0075] When the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the preset oil release rate threshold, it can be considered that the compressor 10 has reached the target operating condition at this time. Therefore, the compressor 10 and the electronic expansion valve 32 of the indoor unit assembly 30 can be restored to normal control at this time, that is, the compressor 10 and the electronic expansion valve 32 can be controlled to restore to the operating condition before the execution of the control strategy. At the same time, the stirring motor 41 can be directly turned off, or the operating gear can be gradually reduced according to the current oil release rate and the preset oil release rate threshold. For example, the operating gear corresponding to the difference between the current oil release rate and the preset oil release rate threshold can be pre-set when the current oil release rate is greater than the preset oil release rate threshold. The larger the difference, the lower the corresponding operating gear. Then, the difference is calculated based on the current oil release rate and the preset oil release rate threshold, and the stirring motor 41 is controlled to operate according to the operating gear corresponding to the difference until the stirring motor 41 stops operating. Of course, in the case of directly controlling the stirring motor 41 to operate according to the speed, the speed corresponding to the difference between the current oil release rate and the preset oil release rate threshold can be pre-set when the current oil release rate is greater than the preset oil release rate threshold. The larger the difference, the lower the corresponding speed. Then, a difference is calculated according to the current oil release rate and the preset oil release rate threshold, and the stirring motor 41 is controlled to run according to the running gear corresponding to the difference until the stirring motor 41 stops running.

[0076] In this way, after the control strategy corresponding to the current working condition is implemented, the next control strategy can be determined according to the current oil level and the current oil release rate. When the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, the electronic expansion valve 32 of the compressor 10 and the indoor unit assembly 30 can be restored to the operating condition before the control strategy is executed, and the stirring motor 41 can be controlled to gradually reduce the operating gear to slow down the speed of stratification of liquid refrigerant and lubricating oil, ensuring that the current oil release rate will not drop below the preset oil release rate threshold for at least a period of time after the stirring motor 41 stops running.

[0077] See also Figure 1 and Figure 8 In some embodiments, the operating gear of the stirring motor 41 includes three gears. The larger the operating gear, the higher the stirring efficiency of the stirring motor 41. The preset operating gear is the third gear. Step 015: gradually reduce the operating gear according to the current oil release rate and the preset oil release rate threshold until the stirring motor 41 stops running, including:

[0078] Step 0151: when the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the preset oil release rate threshold, and less than the first preset threshold, controlling the stirring motor 41 to operate at the second gear;

[0079] Step 0152: When the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the first preset threshold and less than the second preset threshold, the stirring motor 41 is controlled to run at the first gear;

[0080] Step 0153: When the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the second preset threshold, the stirring motor 41 is controlled to stop running.

[0081] Specifically, when there are three operating gears, the preset oil release rate threshold can be used as a base value, and two additional safety thresholds, namely, a first preset threshold and a second preset threshold, can be set. When the current oil release rate is greater than the first preset threshold and less than the second preset threshold, the possibility that the current oil release rate will drop below the preset oil release rate threshold in a short time is low. When the current oil release rate is greater than the second preset threshold and less than the second preset threshold, the possibility that the current oil release rate will drop below the preset oil release rate threshold in a short time is extremely low. For example, the first preset threshold is 12%, and the second preset threshold is 24%.

[0082] The preset operating gear in the control strategy can be three gears, so that the stirring motor 41 can stir the liquid refrigerant and lubricating oil at maximum power to improve the oil return efficiency as much as possible. After executing the corresponding control strategy according to the current working condition of the compressor 10, the current oil level and the current oil release rate can be detected in real time. When the current oil level is less than the preset oil level threshold, or the current oil release rate is less than the preset oil release rate threshold, the compressor 10, the indoor unit assembly 30 and the stirring motor 41 are still controlled to operate according to the control strategy, and the stirring motor 41 is operated at the preset operating gear, that is, the maximum gear. When the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the preset oil release rate threshold, and is less than the first preset threshold, it can be considered that the compressor 10 has reached the target working condition at this time, so at this time, the compressor 10 and the electronic expansion valve 32 of the indoor unit assembly 30 can be restored to normal control, that is, the compressor 10 and the electronic expansion valve 32 are controlled to return to the operating condition before the execution of the control strategy, and the gear of the stirring motor 41 is reduced, and the stirring motor 41 is controlled to operate in the second gear. When the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the first preset threshold, and less than the second preset threshold, the gear of the stirring motor 41 is reduced again, and the stirring motor 41 is controlled to operate in the first gear. When the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the second preset threshold, the stirring motor 41 is controlled to stop operating.

[0083] In this way, when the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, the compressor 10 and the electronic expansion valve 32 of the indoor unit assembly 30 can be restored to the operating conditions before the control strategy is executed to ensure the cooling effect of the air-conditioning system 100. At the same time, the stirring motor 41 can be controlled to gradually reduce the operating gear to reduce the energy consumption of the stirring motor 41 while slowing down the speed of stratification of the liquid refrigerant and the lubricating oil, ensuring that the current oil release rate will not drop below the preset oil release rate threshold for at least a period of time after the stirring motor 41 stops running.

[0084] See also Figure 1 and Fig. 9 In some embodiments, when the control strategy corresponds to the situation that the current oil level is less than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, after step 011: executing the corresponding control strategy based on the current working condition of the compressor 10, the oil return control method further includes:

[0085] Step 017: When the current oil level is greater than the preset oil level threshold and the oil release rate is less than the preset oil release rate threshold, the compressor 10 and the electronic expansion valve 32 are controlled to return to the operating conditions before the control strategy is executed, and the stirring motor 41 is controlled to operate at the preset operating gear;

[0086] Step 019: Real-time detection of current oil release rate;

[0087] Step 021: When the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, gradually reduce the operating gear according to the current oil release rate and the preset oil release rate threshold until the stirring motor 41 stops running.

[0088] Specifically, after executing the control strategy corresponding to the current operating condition that the current oil level is less than a preset oil level threshold and the current oil release rate is less than a preset oil release rate threshold, the current oil level and the current oil release rate may be detected.

[0089] When the current operating condition is that the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the preset oil release rate threshold, all devices of the air-conditioning system 100 can be restored to normal control, that is, the indoor unit assembly 30, the stirring motor 41 and the compressor 10 can be restored to the operating condition before the control strategy is executed, or the operating gear of the stirring motor 41 can be gradually reduced at this time. For details, please refer to the above description of gradually reducing the operating gear of the stirring motor 41, which will not be repeated here. When the current operating condition is that the current oil level is less than the preset oil level threshold, and the current oil release rate is greater than the preset oil release rate threshold, or when the current operating condition is that the current oil level is less than the preset oil level threshold, and the current oil release rate is less than the preset oil release rate threshold, it is considered that the oil level still does not meet the standard, and it is necessary to continue to control the operation of the air-conditioning system 100 according to the control strategy.

[0090] When the current oil level is greater than the preset oil level threshold and the oil release rate is less than the preset oil release rate threshold, it can be considered that the oil level of the compressor 10 has reached the standard, but the liquid transported from the gas-liquid separator 40 to the compressor 10 is mostly liquid refrigerant, and the current oil level is less than the preset oil level threshold, and the current oil release rate is less than the preset oil release rate threshold. The corresponding control strategy may cause a large amount of refrigerant in the pipeline to flow into the gas-liquid separator 40. Therefore, at this time, the compressor 10 and the electronic expansion valve 32 can be controlled to restore to the operating conditions before the execution of the control strategy to reduce the flow of refrigerant in the system and prevent more refrigerant from continuously flowing into the gas-liquid separator 40, so as to improve the oil release rate in the gas-liquid separator 40. At the same time, since the current oil release rate is low, it is also necessary to continue to control the stirring motor 41 to operate at the preset operating gear to improve the mutual dissolution efficiency of the liquid refrigerant and the lubricating oil, avoid stratification of the two, thereby increasing the probability of the lubricating oil entering the oil return hole 111 and entering the compressor 10, so as to facilitate the improvement of the oil release rate of the compressor 10.

[0091] At this time, it is necessary to continue to detect the current oil release rate. When the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, the operating gear is gradually reduced according to the current oil release rate and the preset oil release rate threshold until the stirring motor 41 stops running, so as to slow down the speed of stratification of liquid refrigerant and lubricating oil, and ensure that the current oil release rate will not drop below the preset oil release rate threshold for at least a period of time after the stirring motor 41 stops running. The specific method can refer to the description of gradually reducing the operating gear of the stirring motor 41, which will not be repeated here.

[0092] In this way, after executing the control strategy corresponding to the current operating condition that the current oil level is less than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, the subsequent control method can be determined according to the current oil level and the current oil release rate to ensure that the current oil level can eventually rise to the preset oil level threshold and the current oil release rate can rise to the preset oil release rate threshold.

[0093] Please refer to Figure 1 , Fig.10 and Fig.11 In some embodiments, the air conditioning system 100 further includes a regulating valve 70, which is installed on the suction pipe 11 of the compressor 10. During the normal operation of the air conditioning system 100, the opening of the regulating valve 70 is a second preset opening. When the current operating condition is that the current oil level is greater than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, and when the current operating condition is that the current oil level is less than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, step 011: executing the corresponding control strategy based on the current operating condition of the compressor 10, further includes:

[0094] Step 0121: Reduce the opening of the regulating valve 70 according to the second adjustment value.

[0095] Specifically, a regulating valve 70 with adjustable opening, such as an electric ball valve, can be installed on the suction pipe 11 of the compressor 10, and the adjustable step length of the electric ball valve is 3000P. The flow rate of the gaseous refrigerant in the suction pipe 11 of the compressor 10 can be increased by reducing the opening of the regulating valve 70 to increase the pressure difference of the suction pipe 11 of the compressor 10, thereby increasing the oil return power difference. During the normal operation of the air-conditioning system 100, the opening of the regulating valve 70 is the second preset opening, and the second preset opening is the opening of the regulating valve 70 when both the gas and liquid in the gas-liquid separator 40 can flow smoothly and the gaseous refrigerant can flow into the suction pipe 11 of the compressor 10 in large quantities. The second adjustment value is the difference between the opening of the regulating valve 70 and the second preset opening when both the gas and liquid can flow smoothly and quickly, for example, the second adjustment value is 1000P.

[0096] In the case where the current oil release rate is less than the preset oil release rate threshold, the control strategy may further include reducing the opening of the regulating valve 70 according to the second adjustment value. That is, in the case where the current operating condition is that the current oil level is greater than the preset oil level threshold, and the current oil release rate is less than the preset oil release rate threshold, the control strategy includes controlling the stirring motor 41 to operate at a preset operating gear, reducing the speed of the compressor 10 according to a preset adjustment ratio, reducing the opening of the electronic expansion valve 32 of the indoor unit assembly 30 in the open state according to the first adjustment value, maintaining the operating state of the indoor unit assembly 30 in the closed state, and reducing the opening of the regulating valve 70 according to the second adjustment value. In the case where the current operating condition is that the current oil level is less than the preset oil level threshold, and the current oil release rate is less than the preset oil release rate threshold, the control strategy includes controlling the stirring motor 41 to operate according to the preset operating gear, controlling the compressor 10 to operate according to the preset speed, controlling the opening of the electronic expansion valve 32 of the indoor unit assembly 30 according to the first preset opening, and reducing the opening of the regulating valve 70 according to the second adjustment value.

[0097] In this way, when the current oil release rate is lower than the preset oil release rate threshold, the oil return power difference can be increased by adjusting the gate valve, so that the lubricating oil can be quickly sucked into the oil return hole 111 and quickly moved to the compressor 10 through the suction pipe 11 of the compressor 10, so as to improve the oil return efficiency of the lubricating oil in the gas-liquid separator 40, so that the current oil release rate can be quickly increased to the preset oil release rate threshold.

[0098] See also Figure 1 , Fig.10 and Fig.11 In some embodiments, after executing the corresponding control strategy based on the current operating condition of the compressor 10, the oil return control method further includes:

[0099] Step 023: When the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, the current opening of the regulating valve 70 is adjusted according to the second preset opening.

[0100] Specifically, in the case where the control strategy includes controlling the regulating valve 70, after executing the control strategy, the current opening of the regulating valve 70 can be adjusted according to the current oil level and the current oil release rate. In the case where the current oil level is less than the preset oil level threshold, or the current oil release rate is less than the preset oil release rate threshold, the regulating valve 70 can continue to be controlled according to the control strategy. In the case where the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the preset oil release rate threshold, the current opening of the regulating valve 70 is adjusted according to the second preset opening, so as to facilitate the flow of the liquid in the gas-liquid separator 40 and the liquid in the suction pipe 11 of the compressor 10, and at the same time, it can also ensure that a large amount of liquid refrigerant can smoothly enter the regulating valve 70, thereby ensuring the normal operation of the air conditioning system 100.

[0101] See also Figure 1 and Fig.12 In order to better implement the oil return control method of the embodiment of the present application, the embodiment of the present application also provides an oil return control device 80. The oil return control device 80 is applied to an air conditioning system 100, which includes a compressor 10, an outdoor unit assembly 20, an indoor unit assembly 30 and a gas-liquid separator 40. The exhaust pipe of the compressor 10 is connected to the input port of the outdoor unit assembly 20, the output port of the outdoor unit assembly 20 is connected to the input port of the indoor unit assembly 30, and the output port of the indoor unit assembly 30 is connected to the gas-liquid separator 40; at least part of the suction pipe 11 of the compressor 10 is located in the gas-liquid separator 40, the suction pipe 11 of the compressor 10 is provided with an oil return hole 111, and a stirring motor 41 is provided at the bottom of the gas-liquid separator 40. The oil return control device 80 may include a control module 81. The acquisition module 11 is used to execute a corresponding control strategy based on the current operating condition of the compressor 10. The control strategy at least includes controlling the stirring motor 41 so that the compressor 10 reaches the target operating condition. Under the target operating condition, the current lubricating oil index parameters of the compressor 10 meet the requirements of normal operation of the compressor 10.

[0102] The control module 81 is specifically used to obtain the target operating parameters corresponding to the current operating conditions based on the preset mapping relationship and the current operating conditions, so as to control the operation of the stirring motor 41 according to the target operating parameters. The preset mapping relationship is used to characterize the corresponding operating parameters under different operating conditions.

[0103] The control module 81 is specifically used to control the stirring motor 41 to stop running; and control the compressor 10, the oil separator 50, the four-way valve 60, the outdoor unit component 20 and the indoor unit component 30 to maintain the current operating parameters.

[0104] The control module 81 is specifically used to control the stirring motor 41 to operate at a preset operating gear; reduce the speed of the compressor 10 according to a preset adjustment ratio; reduce the opening of the electronic expansion valve 32 of the indoor unit assembly 30 in the open state according to the first adjustment value; and maintain the operating state of the indoor unit assembly 30 in the closed state.

[0105] The control module 81 is specifically used to control the operation of the stirring motor 41 according to a preset operating gear; control the operation of the compressor 10 according to a preset speed; and control the opening of the electronic expansion valve 32 of the indoor unit assembly 30 according to a first preset opening.

[0106] The oil return control device 80 also includes a recovery module 82. The recovery module 82 is used to control the compressor 10 and the electronic expansion valve 32 of the indoor unit assembly 30 to recover to the operating conditions before the control strategy is executed when the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, and gradually reduce the operating gear according to the current oil release rate and the preset oil release rate threshold until the stirring motor 41 stops running.

[0107] The recovery module 82 is specifically used to control the stirring motor 41 to operate in the second gear when the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the preset oil release rate threshold, and is less than the first preset threshold; to control the stirring motor 41 to operate in the first gear when the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the first preset threshold, and is less than the second preset threshold; and to control the stirring motor 41 to stop running when the current oil level is greater than the preset oil level threshold, and the current oil release rate is greater than the second preset threshold.

[0108] The recovery module 82 is specifically used to control the compressor 10 and the electronic expansion valve 32 to return to the operating conditions before executing the control strategy when the current oil level is greater than the preset oil level threshold and the oil release rate is less than the preset oil release rate threshold, and control the stirring motor 41 to operate at a preset operating gear; real-time detection of the current oil release rate; when the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, gradually reduce the operating gear according to the current oil release rate and the preset oil release rate threshold until the stirring motor 41 stops running.

[0109] The control module 81 is specifically configured to reduce the opening of the regulating valve 70 according to the second adjustment value.

[0110] The recovery module 82 is specifically used to control the regulating valve 70 to recover to the operating condition before executing the control strategy when the current oil level is greater than a preset oil level threshold and the oil release rate is greater than a preset oil release rate threshold.

[0111] The oil return control device 80 further includes a determination module 83. The determination module 83 is used to obtain the current oil level and the current oil release rate of the compressor 10 according to the oil level sensor 12; and determine the current operating condition according to the preset oil level threshold, the preset oil release rate threshold, the current oil level and the current oil release rate.

[0112] The above text describes the oil return control device 80 from the perspective of functional modules in conjunction with the accompanying drawings. The functional modules can be implemented in hardware form, can be implemented in software form, or can be implemented in combination with hardware and software modules. Specifically, the steps of the method embodiments in the embodiments of the present application can be completed by hardware integrated logic circuits in the processor and / or software form instructions. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware coding processor, or can be executed by a combination of hardware and software modules in the coding processor. Optionally, the software module can be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps in the above method embodiments in combination with its hardware.

[0113] Please refer to Figure 1 and Fig.13 The air conditioning system 100100 of the embodiment of the present application includes a compressor 10, an outdoor unit assembly 20, an indoor unit assembly 30, a gas-liquid separator 40, a processor 90, a memory 110 and a computer program. The exhaust pipe of the compressor 10 is connected to the input port of the outdoor unit assembly 20, the output port of the outdoor unit assembly 20 is connected to the input port of the indoor unit assembly 30, and the output port of the indoor unit assembly 30 is connected to the gas-liquid separator 40; at least part of the suction pipe 11 of the compressor 10 is located in the gas-liquid separator 40, the suction pipe 11 of the compressor 10 is provided with an oil return hole 111, and a stirring motor 41 is provided at the bottom of the gas-liquid separator 40. Among them, the computer program is stored in the memory 110 and executed by the processor 90, and the computer program includes instructions for executing the oil return control method of any of the above embodiments.

[0114] See also Fig.14 The embodiment of the present application also provides a computer-readable storage medium 300 on which a computer program 310 is stored. When the computer program 310 is executed by a processor 320, the steps of the oil return control method of any of the above-mentioned embodiments are implemented. For the sake of brevity, they are not repeated here.

[0115] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0116] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0117] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An oil return control method, characterized in that: Applied to an air conditioning system, the air conditioning system comprises a compressor, an outdoor unit assembly, an indoor unit assembly and a gas-liquid separator, the exhaust pipe of the compressor is connected to the input port of the outdoor unit assembly, the output port of the outdoor unit assembly is connected to the input port of the indoor unit assembly, and the output port of the indoor unit assembly is connected to the gas-liquid separator; at least part of the suction pipe of the compressor is located in the gas-liquid separator, the suction pipe is provided with an oil return hole, and a stirring motor is provided at the bottom of the gas-liquid separator; The method comprises: A corresponding control strategy is executed based on the current operating condition of the compressor, and the control strategy at least includes controlling the stirring motor so that the compressor reaches a target operating condition. Under the target operating condition, the current lubricating oil index parameters of the compressor meet the requirements for normal operation of the compressor.

2. The oil return control method according to claim 1, characterized in that: When the current operating condition is that the current oil level is greater than a preset oil level threshold, and the current oil release rate is greater than a preset oil release rate threshold, the compressor reaches a target operating condition, and the corresponding control strategy is executed based on the current operating condition of the compressor, including: Controlling the stirring motor to stop running; The compressor, the outdoor unit assembly and the indoor unit assembly are controlled to maintain current operation parameters.

3. The oil return control method according to claim 1, characterized in that: The stirring motor includes a plurality of operating gears. When the current operating condition is that the current oil level is greater than a preset oil level threshold and the current oil release rate is less than a preset oil release rate threshold, the corresponding control strategy is executed based on the current operating condition of the compressor, including: Controlling the stirring motor to operate at a preset operating gear; reducing the speed of the compressor according to a preset adjustment ratio; reducing the opening degree of the electronic expansion valve of the indoor unit assembly in the open state according to the first adjustment value; Maintain the operating state of the indoor unit components that are in the off state.

4. The oil return control method according to claim 1, characterized in that: The stirring motor includes a plurality of operating gears. When the current operating condition is that the current oil level is less than a preset oil level threshold and the current oil release rate is greater than a preset oil release rate threshold, and when the current operating condition is that the current oil level is less than a preset oil level threshold and the current oil release rate is less than a preset oil release rate threshold, the corresponding control strategy is executed based on the current operating condition of the compressor, including: Controlling the stirring motor to operate according to a preset operating gear; Controlling the operation of the compressor according to a preset speed; The opening degree of the electronic expansion valve of the indoor unit assembly is controlled according to a first preset opening degree.

5. The oil return control method according to any one of claims 3 to 4, characterized in that: After executing the corresponding control strategy based on the current working condition of the compressor, the oil return control method further includes: When the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, controlling the electronic expansion valve of the compressor and the indoor unit assembly to return to the operating conditions before executing the control strategy; The operating gear is gradually reduced according to the current oil release rate and the preset oil release rate threshold until the stirring motor stops running.

6. The oil return control method according to claim 4, characterized in that: In the case where the control strategy corresponds to the situation that the current oil level is less than the preset oil level threshold, and the current oil release rate is less than the preset oil release rate threshold, after executing the corresponding control strategy based on the current working condition of the compressor, the oil return control method further includes: When the current oil level is greater than the preset oil level threshold and the oil release rate is less than the preset oil release rate threshold, the compressor and the electronic expansion valve are controlled to be restored to the operating conditions before the control strategy is executed, and the stirring motor is controlled to operate at a preset operating gear; detecting the current oil release rate in real time; When the current oil level is greater than the preset oil level threshold and the current oil release rate is greater than the preset oil release rate threshold, the operating gear is gradually reduced according to the current oil release rate and the preset oil release rate threshold until the stirring motor stops running.

7. The oil return control method according to claim 1, characterized in that: The air conditioning system further includes a regulating valve, which is installed on the intake pipe. During the normal operation of the air conditioning system, the opening of the regulating valve is a second preset opening. When the current operating condition is that the current oil level is greater than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, and when the current operating condition is that the current oil level is less than the preset oil level threshold and the current oil release rate is less than the preset oil release rate threshold, the corresponding control strategy is executed based on the current operating condition of the compressor, and further includes: reducing the opening of the regulating valve according to the second adjustment value; The oil return control method further includes: When the current oil level is greater than the preset oil level threshold, and the oil release rate is greater than the preset oil release rate threshold, the regulating valve is controlled to return to the operating condition before the control strategy is executed.

8. The oil return control method according to claim 1, characterized in that: The compressor includes an oil level sensor, and the oil return control method further includes: Acquiring a current oil level and a current oil release rate of the compressor according to the oil level sensor; The current operating condition is determined according to a preset oil level threshold, a preset oil release rate threshold, the current oil level and the current oil release rate.

9. An air conditioning system, characterized in that: include: A compressor, an outdoor unit assembly, an indoor unit assembly and a gas-liquid separator, wherein the exhaust pipe of the compressor is connected to the input port of the outdoor unit assembly, the output port of the outdoor unit assembly is connected to the input port of the indoor unit assembly, and the output port of the indoor unit assembly is connected to the gas-liquid separator; at least part of the suction pipe of the compressor is located in the gas-liquid separator, the suction pipe is provided with an oil return hole, and a stirring motor is provided at the bottom of the gas-liquid separator; Processor, memory; and A computer program, wherein the computer program is stored in the memory and executed by the processor, and the computer program includes instructions for executing the oil return control method according to any one of claims 1 to 8.

10. The air conditioning system according to claim 9, characterized in that: It also includes an oil separator and a four-way valve, wherein the exhaust pipe of the compressor is connected to the input port of the oil separator; the first output port of the oil separator is connected to the four-way valve, and is connected to the input port of the outdoor unit component through the four-way valve, and the second output port of the oil separator is connected to the suction pipe of the compressor; the output port of the indoor unit component is connected to the four-way valve, and is connected to the gas-liquid separator through the four-way valve.

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