Air conditioner oil return control method, device, air conditioner and storage medium

Abstract

The present invention relates to the technical field of air conditioners, and discloses an oil return control method, device, air conditioner and storage medium for an air conditioner. The method includes: when the air conditioner is provided with a quick connector and is in a preset operation mode, determining whether a preset condition is satisfied according to the obtained operation frequency and operation duration of the compressor of the air conditioner; when the preset condition is satisfied, setting the solenoid valve to a closed state to reduce the air flow rate in the liquid pipe connecting pipe, and enabling the compressor to suck back the oil in the evaporator and the gas pipe connecting pipe. By judging whether it is necessary to control the compressor to perform forced oil return through the operation mode of the air conditioner provided with a quick connector, the operation duration and the operation frequency of the compressor of the air conditioner, the accuracy of oil return judgment of the air conditioner is improved. Then, by closing the solenoid valve to reduce the air flow rate in the pipe, the compressor sucks back the oil in the evaporator and the gas pipe connecting pipe, effectively improving the oil return performance of the air conditioner, prolonging the service life of the compressor, and improving the reliability of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an oil return control method, device, air conditioner and storage medium for an air conditioner. Background Art

[0002] Different from ordinary air conditioners, in an air conditioner provided with quick connectors, the quick connectors, connecting pipes, (indoor unit) evaporator and (outdoor unit) condenser are directly connected. The system can be sealed through the quick connectors and can operate without vacuum pumping, which is convenient for installation. However, the existence of the quick connectors makes the circulation channels of the refrigerant and the refrigerating oil smaller (when the quick connectors are tightened, the flow-through channel is only at the sealing ring of the quick connectors, and the channel area is greatly reduced compared with ordinary connecting pipes. When the air conditioner operates, the gaseous refrigerant is easier to pass through, while the liquid oil is difficult to pass through), which is more unfavorable for the liquid oil to pass through, that is, it has a certain blocking effect on the oil. Over time, a large amount of oil will be retained inside the (indoor unit) evaporator or the gas pipe connecting pipe and cannot return to the compressor in time, resulting in insufficient lubrication of the compressor (that is, it is prone to be in a state of less oil or even lack of oil), and ultimately leading to the damage of the compressor. Therefore, how to effectively improve the oil return performance of the air conditioner, extend the service life of the compressor, and improve the reliability of the air conditioner has become an urgent problem to be solved.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main object of the present invention is to provide an oil return control method, device, air conditioner and storage medium for an air conditioner, aiming to solve the technical problem of how to effectively improve the oil return performance of the air conditioner, extend the service life of the compressor, and improve the reliability of the air conditioner.

[0005] To achieve the above object, the present invention provides an oil return control method for an air conditioner. The air conditioner includes a compressor, a gas pipe connecting pipe, an evaporator, a liquid pipe connecting pipe and a condenser. Among them, the condenser is connected to the evaporator through the liquid pipe connecting pipe, the evaporator is connected to the compressor through the gas pipe connecting pipe, a first valve core component and a second valve core component are connected in series on the liquid pipe connecting pipe, an electromagnetic valve is connected in parallel with the first valve core component, and the flow rate of the first valve core component is less than that of the second valve core component;

[0006] The method includes the following steps:

[0007] When the air conditioner is provided with quick connectors and is in a preset operation mode, obtain the operating frequency and operating duration of the compressor of the air conditioner;

[0008] Judge whether a preset condition is satisfied according to the operating frequency and the operating duration;

[0009] When preset conditions are met, set the solenoid valve to a closed state to reduce the air flow rate in the liquid pipe connecting pipe, and cause the compressor to draw back the oil in the evaporator and the gas pipe connecting pipe.

[0010] Optionally, the step of judging whether preset conditions are met according to the operating frequency and the operating duration includes:

[0011] Judge whether the operating frequency is less than a preset operating frequency;

[0012] When the operating frequency is less than the preset operating frequency, judge whether preset conditions are met according to whether the operating duration is greater than a first operating duration.

[0013] Optionally, after the step of judging whether the operating frequency is less than the preset operating frequency, the following is further included:

[0014] When the operating frequency is greater than the preset operating frequency, judge whether preset conditions are met according to whether the operating duration is greater than a second operating duration, and the second operating duration is greater than the first operating duration.

[0015] Optionally, the step of, when preset conditions are met, setting the solenoid valve to a closed state to reduce the air flow rate in the liquid pipe connecting pipe, and causing the compressor to draw back the oil in the evaporator and the gas pipe connecting pipe includes:

[0016] When preset conditions are met, adjust the operating frequency to a preset oil return frequency, and set the solenoid valve to a closed state to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor draws back the oil in the evaporator and the gas pipe connecting pipe.

[0017] Optionally, the step of, when preset conditions are met, adjusting the operating frequency to a preset oil return frequency, and setting the solenoid valve to a closed state to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor draws back the oil in the evaporator and the gas pipe connecting pipe includes:

[0018] When preset conditions are met, judge whether the operating frequency is less than the preset oil return frequency;

[0019] When the operating frequency is less than the preset oil return frequency, increase the operating frequency to the preset oil return frequency, and set the solenoid valve to a closed state to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor draws back the oil in the evaporator and the gas pipe connecting pipe.

[0020] Optionally, after the step of, when preset conditions are met, judging whether the operating frequency is less than the preset oil return frequency, the following is further included:

[0021] When the operating frequency is greater than the preset oil return frequency, reduce the operating frequency to the preset oil return frequency, and after a preset time delay, set the solenoid valve to the closed state to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor pumps back the oil in the evaporator and the gas pipe connecting pipe.

[0022] Optionally, the quick connectors include an outdoor unit liquid pipe quick connector, an indoor unit liquid pipe quick connector, an indoor unit gas pipe quick connector, and an outdoor unit gas pipe quick connector;

[0023] Wherein, the outdoor unit liquid pipe quick connector and the indoor unit liquid pipe quick connector are arranged at both ends of the liquid pipe connecting pipe, and the indoor unit gas pipe quick connector and the outdoor unit gas pipe quick connector are arranged at both ends of the gas pipe connecting pipe.

[0024] In addition, to achieve the above object, the present invention also provides an air conditioner oil return control device. The air conditioner includes a compressor, a gas pipe connecting pipe, an evaporator, a liquid pipe connecting pipe, and a condenser. Wherein, the condenser is connected to the evaporator through the liquid pipe connecting pipe, the evaporator is connected to the compressor through the gas pipe connecting pipe, a first valve element component and a second valve element component are connected in series on the liquid pipe connecting pipe, a solenoid valve is connected in parallel with the first valve element component, and the flow rate of the first valve element component is less than the flow rate of the second valve element component;

[0025] The air conditioner oil return control device includes:

[0026] A data acquisition module, configured to acquire the operating frequency and operating duration of the compressor of the air conditioner when the air conditioner is provided with quick connectors and is in a preset operating mode;

[0027] A condition judgment module, configured to judge whether a preset condition is met according to the operating frequency and the operating duration;

[0028] An oil return control module, configured to set the solenoid valve to the closed state when the preset condition is met, so as to reduce the air flow rate in the liquid pipe connecting pipe, and enable the compressor to pump back the oil in the evaporator and the gas pipe connecting pipe.

[0029] In addition, to achieve the above object, the present invention also provides an air conditioner, which includes a memory, a processor, and an air conditioner oil return control program stored on the memory and executable on the processor. The air conditioner oil return control program is configured to implement the steps of the air conditioner oil return control method as described above.

[0030] In addition, to achieve the above object, the present invention further provides a storage medium, on which an air conditioner oil return control program is stored. When the air conditioner oil return control program is executed by a processor, the steps of the air conditioner oil return control method as described above are implemented.

[0031] In the present invention, when the air conditioner is provided with a quick connector and is in a preset operation mode, the operation frequency and operation duration of the compressor of the air conditioner are obtained; it is judged whether a preset condition is satisfied according to the operation frequency and operation duration. When the preset condition is satisfied, the solenoid valve is set to the closed state to reduce the air flow rate in the liquid pipe connecting pipe, and the compressor sucks back the oil in the evaporator and the gas pipe connecting pipe. By using the operation mode of the air conditioner, the operation duration and operation frequency of the compressor of the air conditioner to judge whether it is necessary to control the compressor to perform forced oil return to improve the accuracy of air conditioner oil return judgment, and then by setting the solenoid valve to the closed state to reduce the air flow rate in the liquid pipe connecting pipe and the gas pipe connecting pipe. Correspondingly, the liquid flow rate in the gas pipe connecting pipe is increased, so that the compressor sucks back the oil in the evaporator and the gas pipe connecting pipe, effectively improving the oil return performance of the air conditioner, prolonging the service life of the compressor, and improving the reliability of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of an air conditioner in the hardware operation environment related to the embodiment of the present invention;

[0033] Figure 2 is a schematic flowchart of the first embodiment of the air conditioner oil return control method of the present invention;

[0034] Figure 3 is a schematic structural diagram of an air conditioner with a quick connector related to the air conditioner oil return control method of the present invention;

[0035] Figure 4 is a schematic structural diagram of a quick connector related to the air conditioner oil return control method of the present invention;

[0036] Figure 5 is a schematic flowchart of the second embodiment of the air conditioner oil return control method of the present invention;

[0037] Figure 6 is a schematic flowchart of the third embodiment of the air conditioner oil return control method of the present invention;

[0038] Figure 7 is a schematic block diagram of the first embodiment of the air conditioner oil return control device of the present invention.

[0039] Description of the reference numerals in the drawings:

[0040]

[0041]

[0042] The implementation, functional features and advantages of the object of the present invention will be further described in conjunction with embodiments with reference to the accompanying drawings. Detailed implementation manners

[0043] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] Refer to Figure 1 , Figure 1 which is a schematic structural diagram of an air conditioner for the hardware operating environment involved in the embodiment solution of the present invention.

[0045] As Figure 1 shown, the air conditioner may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display) and an input unit such as a keyboard (Keyboard). Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (WI-FI) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0046] Those skilled in the art can understand that Figure 1 the structure shown in

[0047] As Figure 1 shown, the memory 1005 as a storage medium may include an operating system, a data storage module, a network communication module, a user interface module, and an air conditioner oil return control program.

[0048] In Figure 1In the air conditioner shown, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the air conditioner of the present invention can be arranged in the air conditioner. The air conditioner calls the air conditioner oil return control program stored in the memory 1005 through the processor 1001 and executes the air conditioner oil return control method provided by the embodiments of the present invention.

[0049] Embodiments of the present invention provide an air conditioner oil return control method. Refer to Figure 2 , Figure 2 which is a schematic flowchart of the first embodiment of the air conditioner oil return control method of the present invention.

[0050] In this embodiment, the air conditioner oil return control method includes the following steps:

[0051] Step S10: When the air conditioner is equipped with a quick connector and is in a preset operation mode, obtain the operating frequency and operating duration of the compressor of the air conditioner.

[0052] It is easy to understand that it can be first determined whether the air conditioner is equipped with a quick connector. When the air conditioner is equipped with a quick connector, it is then determined whether the air conditioner is in a preset operation mode. Among them, the preset operation mode can be set to a refrigeration mode or a dehumidification mode. That is to say, when operating in a heating mode, the oil return operation detection may not be entered.

[0053] Refer to Figure 3 , Figure 3 which is a schematic structural diagram of an air conditioner equipped with a quick connector related to the air conditioner oil return control method of the present invention.

[0054] Figure 3 In , the air conditioner equipped with a quick connector includes a compressor 1, a four-way valve 2, a (outdoor side) condenser 3, a first valve core component 4, a solenoid valve 5, a second valve core component 6, an outdoor unit liquid pipe quick connector 7, an indoor unit liquid pipe quick connector 8, an (indoor side) evaporator 9, an indoor unit gas pipe quick connector 10, and an outdoor unit gas pipe quick connector 11.

[0055] Among them, both ends of the liquid pipe connecting pipe (i.e., the indoor and outdoor connecting pipe - liquid pipe) are respectively provided with an outdoor unit liquid pipe quick connector 7 and an indoor unit liquid pipe quick connector 8. Both ends of the gas pipe connecting pipe (i.e., the indoor and outdoor connecting pipe - gas pipe) are respectively provided with an indoor unit gas pipe quick connector 10 and an outdoor unit gas pipe quick connector 11. The condenser 3 is connected to the evaporator 9 through the liquid pipe connecting pipe. The evaporator 9 is then connected to the compressor 1 through the gas pipe connecting pipe. The liquid pipe connecting pipe is connected in series with a first valve core component 4 and a second valve core component 6, and the first valve core component is connected in parallel with a solenoid valve 5.

[0056] It should be noted that the flow rate of the second spool component 6 is greater than that of the first spool component 4. For example, the flow rate of the second spool component 6 can be set to be greater than or equal to twice the flow rate of the first spool component 4. In addition, in specific implementation, both the second spool component 6 and the first spool component 4 can be set as capillary tubes.

[0057] It should be understood that the above is only for illustration and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0058] Further, when the air conditioner equipped with the quick connector is in the preset operation mode, that is, when the air conditioner equipped with the quick connector is in the refrigeration mode or the dehumidification mode, the operating frequency f of the compressor of the air conditioner can be obtained a and the (cumulative) operating duration t.

[0059] Step S20: Judge whether the preset conditions are met according to the operating frequency and the operating duration;

[0060] It is easy to understand that after obtaining the operating frequency f a of the compressor and the (cumulative) operating duration t, it can be judged whether the preset conditions are met according to the operating frequency f a and the operating duration t. The preset conditions can be understood as the conditions for judging whether to control the compressor to start forced oil return. In specific implementation, it can be set to first judge the frequency range where the operating frequency f a is located, then determine the corresponding preset operating duration according to the different frequency ranges, and then judge whether the preset conditions are met by judging whether the operating duration t is greater than the corresponding preset operating duration. In specific implementation, the preset operating duration can be set according to actual needs, and this embodiment does not limit this.

[0061] Step S30: When the preset conditions are met, set the solenoid valve to the closed state to reduce the air flow rate in the liquid pipe connecting pipe and make the compressor draw back the oil in the evaporator and the gas pipe connecting pipe.

[0062] It should be noted that when the preset conditions are met, the solenoid valve 5 can be switched from the open state to the closed state (that is, the flow rate in the pipe is controlled by the second spool component 6 and then converted to be controlled by the first spool component 4 and the second spool component 6 connected in series. Since the flow rate of the first spool component 4 is less than that of the second spool component 6, the flow rate in the pipe will decrease), so as to reduce the air flow rate in the liquid pipe connecting pipe and the gas pipe connecting pipe, and make the compressor 1 draw back the oil in the evaporator 9 and the gas pipe connecting pipe.

[0063] Refer to Figure 4 , Figure 4Schematic structural diagram of the quick connector involved in the oil return control method of the air conditioner of the present invention.

[0064] Figure 4 Among them, the quick connector 500 includes:

[0065] Male connector 510, the outer surface of the male connector 510 is provided with threads;

[0066] Female connector 520, the female connector 520 includes an insertion tube 521 and a nut 522 connected to the outer surface of the insertion tube 521. The insertion tube 521 extends into the male connector 510, the insertion tube 521 is in sealing contact with the male connector 510, and the nut 522 is threadedly connected to the male connector 510.

[0067] Among them, the male connector 510 includes: an installation tube 515, threads are provided on the outer surface of the installation tube 515, and a first valve port 516 is formed inside the installation tube 515; a piston 518, the piston 518 is slidably installed along the axis of the installation tube 515 inside the installation tube 515, and the piston 518 movably seals the first valve port 516; and, a first elastic reset member 530, installed inside the installation tube 515, the first elastic reset member 515 is connected to the piston 518 to drive the piston 518 to seal the first valve port 516.

[0068] The female connector 520 further includes: a thimble 528 provided inside the insertion tube 521, the thimble 528 is used to abut against the piston 518, and the piston 518 has a first working position where it abuts against the thimble 528 to open the first valve port 516, and a second working position where it closes the first valve port 516.

[0069] The insertion tube 521 includes: a base tube 525; and a valve sleeve 526, a part of the valve sleeve 526 is arranged inside the base tube 525, the valve sleeve 526 is slidably arranged along the axis of the base tube 525, the valve sleeve 526 is in sealing connection with the insertion tube 521, the valve sleeve 526 sleeves the thimble 528, and a second valve port is formed at one end of the valve sleeve 526 away from the base tube 525. The thimble 528 has a plug 529 adapted to the second valve port, and the plug 529 is located on the side of the valve sleeve 526 away from the base tube 525;

[0070] A second elastic reset member 540, installed inside the base tube 521, the second elastic reset member 540 is connected to the valve sleeve 526 to drive the valve sleeve 526 to be connected to the plug 529.

[0071] In addition, the male connector 510 further includes a first sealing ring 581 sleeving the piston 518, and the first sealing ring 581 is used to abut against the wall surface of the first valve port 516. The first sealing ring 581 is used to enhance the sealing effect of the piston 518 on the first valve port 516 and ensure no leakage when the male connector 510 is not assembled. Similarly, a second sealing ring 582 is sleeved outside the thimble 528, and a third sealing ring 583 is sleeved outside the valve sleeve 526 to further improve the sealing effect.

[0072] It is easy to understand that after the quick connectors 500 (such as the outdoor unit liquid pipe quick connector 7, the indoor unit liquid pipe quick connector 8, the indoor unit gas pipe quick connector 10, and the outdoor unit gas pipe quick connector 11) are tightened, the flow passage in the quick connector 500 is only at the sealing rings (i.e., the first sealing ring 581, the second sealing ring 582, and the third sealing ring 583). The passage area is significantly reduced compared to the ordinary connecting pipe. When the air conditioner operates, the gaseous refrigerant is more likely to pass through, while the liquid oil has difficulty passing through. That is, the quick connector 500 has a certain blocking effect on the oil, causing the oil to stay in the evaporator or the gas pipe connecting pipe and unable to return to the compressor in time. When the operation time accumulates for a long time, the compressor is prone to being short of oil or even running out of oil, ultimately leading to compressor wear and failure. In this embodiment, the electromagnetic valve 5 is switched from the open state to the closed state to reduce the gas flow rate in the liquid pipe connecting pipe and the gas pipe connecting pipe. Since the flow rate in the pipe is fixed, when the gas flow rate decreases, the liquid flow rate increases accordingly. This also enables the compressor 1 to draw back the oil in the evaporator 9 and the gas pipe connecting pipe by using its own suction characteristics to achieve forced oil return.

[0073] In this embodiment, by using the operation mode of the air conditioner, the operation duration and operation frequency of the compressor of the air conditioner to determine whether to control the compressor for forced oil return to improve the oil return judgment accuracy of the air conditioner. When the preset conditions are met, that is, when it is necessary to control the compressor for forced oil return, the electromagnetic valve is closed to reduce the gas flow rate in the pipe, so that the compressor draws back the oil in the evaporator and the gas pipe connecting pipe. That is, by closing the electromagnetic valve to reduce the gas flow rate in the pipe, correspondingly, the liquid flow rate in the pipe is increased, enabling the compressor to draw back the oil in the evaporator and the gas pipe connecting pipe, effectively improving the oil return performance of the air conditioner, extending the service life of the compressor, and improving the reliability of the air conditioner.

[0074] Reference Figure 5 , Figure 5 is a schematic flowchart of the second embodiment of the oil return control method for the air conditioner of the present invention.

[0075] Based on the above first embodiment, in this embodiment, the step S20 includes:

[0076] Step S201: Determine whether the operation frequency is less than a preset operation frequency;

[0077] Step S202: When the operation frequency is less than the preset operation frequency, determine whether the preset conditions are met according to whether the operation duration is greater than the first operation duration.

[0078] In a specific implementation, to improve the oil return judgment accuracy, in the cooling or dehumidification mode, it can be determined whether the operation frequency f of the compressor 1 a is less than the preset operation frequency f a0 , when the operation frequency f aLess than the preset operating frequency f a0 When it is less than the preset operating frequency f, the cumulative operating time t of the compressor 1 can be recorded, and it is judged whether the preset condition is satisfied according to whether the operating duration t is greater than the first operating duration t0. When t is greater than t0, it is determined that the compressor needs to be forced to return oil, that is, the preset condition is satisfied. Among them, the first operating duration t0 can be set according to actual needs, and this embodiment does not limit it. f a0 It can also be set according to actual needs, but in specific implementation, it needs to be greater than the set value of the air conditioner without quick connectors.

[0079] Step S203: When the operating frequency is greater than the preset operating frequency, it is judged whether the preset condition is satisfied according to whether the operating duration is greater than the second operating duration, and the second operating duration is greater than the first operating duration.

[0080] In specific implementation, in order to improve the accuracy of oil return judgment, when the operating frequency f of the compressor 1 a is greater than the preset operating frequency f a0 the cumulative operating time t of the compressor 1 can be recorded, and it is judged whether the preset condition is satisfied according to whether the operating duration t is greater than the second operating duration t0'. When t is greater than t0', it is determined that the compressor needs to be forced to return oil, that is, the preset condition is satisfied. Among them, the second operating duration t0' can be set to t0 * n of the first operating duration, and n can be set according to actual needs. In this embodiment, it can be set to [6, 8].

[0081] It should be understood that the above is only an example, and it does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0082] In this embodiment, by defining different oil return judgment conditions according to the different operating frequencies and operating durations of the compressor respectively to improve the accuracy of oil return judgment. Further, it also ensures that during the long-term operation of the air conditioner, the compressor is sufficiently lubricated to extend the service life of the compressor and improve the reliability of the air conditioner.

[0083] Reference Figure 6 , Figure 6 is the flowchart of the third embodiment of the oil return control method for the air conditioner of the present invention.

[0084] Based on the above embodiments, in this embodiment, the step S30 includes:

[0085] Step S301: When the preset condition is satisfied, adjust the operating frequency to the preset oil return frequency, and set the solenoid valve to the closed state to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor sucks back the oil in the evaporator and the gas pipe connecting pipe.

[0086] It should be noted that when the preset conditions are met, that is, when it is determined that the compressor 1 needs to perform forced oil return, the operating frequency f of the compressor 1 can be judged first a whether it is less than the preset oil return frequency f ah , where the preset oil return frequency f ah can be set according to actual needs, and this embodiment does not limit it

[0087] In a specific implementation, in order to further improve the oil return performance of the air conditioner, when the operating frequency f a is less than the preset oil return frequency f ah , the operating frequency f a can be increased to the preset oil return frequency f ah , and the solenoid valve 5 is closed to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor 1 sucks back the oil in the evaporator 9 and the gas pipe connecting pipe. Further, the closing time of the solenoid valve 5 can be recorded, and it is detected whether the closing time of the solenoid valve 5 is greater than the preset closing time t h . When the closing time of the solenoid valve 5 is greater than the preset closing time t h , the oil return ends, the solenoid valve 5 is switched back from the closed state to the open state, and the flow rate in the pipe is controlled by the second spool component 6, that is, mainly the second spool component 6 plays a throttling role, and the operating frequency f a is reduced to the frequency before oil return and continues to operate in the refrigeration mode or the dehumidification mode. Among them, the preset closing time t h can be set according to actual needs, and in this embodiment, it can be set to 20 s to 30 s

[0088] In a specific implementation, in order to further improve the oil return performance of the air conditioner, when the operating frequency f a is greater than the preset oil return frequency f ah , the operating frequency f a is reduced to the preset oil return frequency f ah , and after a preset time period t1, the solenoid valve 5 is closed (it can be understood that the compressor 1 closes the solenoid valve 5 after operating for the preset time period t1 at the preset oil return frequency f ah ) to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor 1 sucks back the oil in the evaporator 9 and the gas pipe connecting pipe. Among them, the preset time period t1 can be set according to actual needs. In this embodiment, it can be set to 30 s to 60 s. Further, the closing time of the solenoid valve 5 can also be recorded, and it is detected whether the closing time of the solenoid valve 5 is greater than the preset closing time t h . When the closing time of the solenoid valve 5 is greater than the preset closing time t h , the oil return ends, the solenoid valve 5 is switched back from the closed state to the open state, and the flow rate in the pipe is controlled by the second spool component 6, that is, mainly the second spool component 6 plays a throttling role, and the operating frequency f aIncrease to the frequency before oil return and continue to operate in the refrigeration mode or the dehumidification mode.

[0089] It is easy to understand that after the quick connectors 500 (such as the outdoor unit liquid pipe quick connector 7, the indoor unit liquid pipe quick connector 8, the indoor unit gas pipe quick connector 10, and the outdoor unit gas pipe quick connector 11) are tightened, the flow channel in the quick connector 500 is only at the sealing ring, and the channel area is significantly reduced compared to the ordinary connecting pipe. When the air conditioner operates, the gaseous refrigerant is more likely to pass through, while the liquid oil has difficulty passing through. That is, the quick connector 500 has a certain blocking effect on the oil, causing the oil to stay in the evaporator or the gas pipe connecting pipe and unable to return to the compressor in time. When the operation time accumulates, the compressor is prone to being short of oil or even lacking oil, ultimately leading to compressor wear and failure. In this embodiment, the electromagnetic valve 5 is switched from the open state to the closed state to reduce the air flow rate in the liquid pipe connecting pipe and the gas pipe connecting pipe. Since the flow rate in the pipe is fixed, when the air flow rate decreases, the liquid flow rate increases accordingly, enabling the compressor 1 to draw back the oil in the evaporator 9 and the gas pipe connecting pipe by using its own suction characteristics to achieve forced oil return. During this process, the operating frequency f of the compressor 1 a is adjusted to the preset oil return frequency f ah and maintained at the preset oil return frequency f ah until the oil return ends, so that after the compressor 1 starts the oil return operation, the oil return is more thorough, further improving the oil return effect.

[0090] It should be understood that the above is only for illustration and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0091] In this embodiment, when the preset conditions are met, that is, when it is determined that the compressor needs to perform forced oil return, the operating frequency is adjusted to the preset oil return frequency, and the electromagnetic valve is switched from the open state to the closed state to reduce the air flow rate in the liquid pipe connecting pipe, enabling the compressor to draw back the oil in the evaporator and the gas pipe connecting pipe. By introducing the adjustment of the operating frequency of the compressor during forced oil return of the compressor, the oil return effect of the compressor is further improved, the service life of the compressor is extended, and the reliability of the air conditioner is improved.

[0092] In addition, an embodiment of the present invention also provides a storage medium, on which an air conditioner oil return control program is stored. When the air conditioner oil return control program is executed by a processor, the steps of the air conditioner oil return control method as described above are implemented.

[0093] Refer to Figure 7 , Figure 7 which is the structural block diagram of the first embodiment of the air conditioner oil return control device of the present invention.

[0094] AsFigure 7 As shown in the figure, the oil return control device for an air conditioner proposed in an embodiment of the present invention includes:

[0095] A data acquisition module 100, configured to acquire the operating frequency and operating duration of the compressor of the air conditioner when the air conditioner is provided with a quick connector and is in a preset operating mode;

[0096] It is easy to understand that it can be first determined whether the air conditioner is provided with a quick connector. When the air conditioner is provided with a quick connector, it is then determined whether the air conditioner is in a preset operating mode. Among them, the preset operating mode can be set to the cooling mode or the dehumidification mode. That is to say, when operating in the heating mode, the oil return operation detection may not be entered.

[0097] Refer to Figure 3 , Figure 3 which is a schematic structural diagram of an air conditioner with a quick connector involved in the oil return control method of the air conditioner of the present invention.

[0098] Figure 3 In, the air conditioner with a quick connector includes a compressor 1, a four-way valve 2, a (outdoor side) condenser 3, a first valve core component 4, a solenoid valve 5, a second valve core component 6, an outdoor unit liquid pipe quick connector 7, an indoor unit liquid pipe quick connector 8, an (indoor side) evaporator 9, an indoor unit air pipe quick connector 10, and an outdoor unit air pipe quick connector 11.

[0099] Among them, both ends of the liquid pipe connecting pipe (i.e., the indoor and outdoor connecting pipe - liquid pipe) are respectively provided with an outdoor unit liquid pipe quick connector 7 and an indoor unit liquid pipe quick connector 8. Both ends of the air pipe connecting pipe (i.e., the indoor and outdoor connecting pipe - air pipe) are respectively provided with an indoor unit air pipe quick connector 10 and an outdoor unit air pipe quick connector 11. The condenser 3 is connected to the evaporator 9 through the liquid pipe connecting pipe, and the evaporator 9 is then connected to the compressor 1 through the air pipe connecting pipe. A first valve core component 4 and a second valve core component 6 are connected in series on the liquid pipe connecting pipe, and a solenoid valve 5 is connected in parallel with the first valve core component 4.

[0100] It should be noted that the flow rate of the second valve core component 6 is greater than that of the first valve core component 4. For example, the flow rate of the second valve core component 6 can be set to be greater than or equal to twice the flow rate of the first valve core component 4. In addition, in specific implementation, both the second valve core component 6 and the first valve core component 4 can be set as capillary tubes.

[0101] It should be understood that the above is only an example for illustration and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0102] Further, when the air conditioner with a quick connector is in a preset operating mode, that is, when the air conditioner with a quick connector is in the cooling mode or the dehumidification mode, the operating frequency f of the compressor of the air conditioner can be acquireda and the (cumulative) operation duration t.

[0103] A condition judgment module 200, configured to judge whether a preset condition is satisfied according to the operation frequency and the operation duration;

[0104] It is easy to understand that after obtaining the operation frequency f of the compressor a and the (cumulative) operation duration t, it is possible to judge whether the preset condition is satisfied according to the operation frequency f a and the operation duration t. The preset condition can be understood as the condition for judging whether it is necessary to control the compressor to start forced oil return. In a specific implementation, it can be set to first judge the frequency range where the operation frequency f a is located, then determine the corresponding preset operation duration according to the different frequency ranges, and then judge whether the preset condition is satisfied by judging whether the operation duration t is greater than the corresponding preset operation duration. In a specific implementation, the preset operation duration can be set according to actual needs, and this embodiment does not limit this.

[0105] In a specific implementation, in order to improve the accuracy of oil return judgment, in the refrigeration or dehumidification mode, it is possible to judge whether the operation frequency f of the compressor 1 a is less than a preset operation frequency f a0 , when the operation frequency f a is less than the preset operation frequency f a0 , the cumulative operation time t of the compressor 1 can be recorded, and it is judged whether the preset condition is satisfied according to whether the operation duration t is greater than the first operation duration t0. When t is greater than t0, it is determined that the compressor needs to be forced to return oil, that is, the preset condition is satisfied. Among them, the first operation duration t0 can be set according to actual needs, and this embodiment does not limit this. f a0 can also be set according to actual needs, but in a specific implementation, it needs to be greater than the set value of an air conditioner without quick connectors.

[0106] Step S203: When the operation frequency is greater than the preset operation frequency, judge whether the preset condition is satisfied according to whether the operation duration is greater than a second operation duration, and the second operation duration is greater than the first operation duration.

[0107] In a specific implementation, in order to improve the accuracy of oil return judgment, when the operation frequency f of the compressor 1 a is greater than the preset operation frequency f a0 , the cumulative operation time t of the compressor 1 can be recorded, and it is judged whether the preset condition is satisfied according to whether the operation duration t is greater than the second operation duration t0'. When t is greater than t0', it is determined that the compressor needs to be forced to return oil, that is, the preset condition is satisfied. Among them, the second operation duration t0' can be set to the first operation duration t0 * n, and n can be set according to actual needs. In this embodiment, it can be set to [6, 8].

[0108] It should be understood that the above is only for illustration and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set it as needed, and the present invention does not make any restrictions on this.

[0109] The oil return control module 300 is configured to set the solenoid valve to the closed state when a preset condition is met, so as to reduce the air flow rate in the liquid pipe connecting pipe, and enable the compressor to draw back the oil in the evaporator and the gas pipe connecting pipe.

[0110] It should be noted that when the preset condition is met, the solenoid valve 5 can be switched from the open state to the closed state (that is, from the state of controlling the flow rate in the pipe through the second valve core component 6 to the state of controlling the flow rate in the pipe through the second valve core component 6 and the first valve core component 4 connected in series, and the flow rate of the first valve core component 4 is less than that of the second valve core component 6. Therefore, the flow rate in the pipe will also be reduced accordingly), so as to reduce the air flow rate in the liquid pipe connecting pipe and the gas pipe connecting pipe, and enable the compressor 1 to draw back the oil in the evaporator 9 and the gas pipe connecting pipe.

[0111] Refer to Figure 4 , Figure 4 which is a schematic structural diagram of the quick connector involved in the oil return control method of the air conditioner of the present invention.

[0112] Figure 4 In

[0113] The male connector 510 has a thread on its outer surface.

[0114] The female connector 520 includes an insertion tube 521 and a nut 522 connected to the outer surface of the insertion tube 521. The insertion tube 521 extends into the male connector 510, the insertion tube 521 is in sealed contact with the male connector 510, and the nut 522 is threadedly connected to the male connector 510.

[0115] Among them, the male connector 510 includes: a mounting tube 515 with a thread provided on its outer surface, and a first valve port 516 formed inside the mounting tube 515; a piston 518 that slides axially along the mounting tube 515 and is installed inside the mounting tube 515, and the piston 518 movably seals the first valve port 516; and a first elastic reset member 530 installed inside the mounting tube 515, and the first elastic reset member 515 is connected to the piston 518 to drive the piston 518 to seal the first valve port 516.

[0116] The female connector 520 further includes: a thimble 528 provided inside the insertion tube 521, and the thimble 528 is used to abut against the piston 518. The piston 518 has a first working position where it abuts against the thimble 528 to open the first valve port 516, and a second working position where it closes the first valve port 516.

[0117] The cannula 521 includes: a base tube 525; and a valve sleeve 526, a part of the valve sleeve 526 is disposed within the base tube 525, the valve sleeve 526 is slidably disposed along the axial direction of the base tube 525, the valve sleeve 526 is sealingly connected to the cannula 521, the valve sleeve 526 sleeves a thimble 528, a second valve port is formed at one end of the valve sleeve 526 away from the base tube 525, the thimble 528 has a plug 529 adapted to the second valve port, and the plug 529 is located on the side of the valve sleeve 526 away from the base tube 525;

[0118] A second elastic reset member 540 is installed within the base tube 521, and the second elastic reset member 540 is connected to the valve sleeve 526 to drive the valve sleeve 526 to be connected to the plug 529.

[0119] In addition, the male connector 510 further includes a first sealing ring 581 sleeving a piston 518, and the first sealing ring 581 is used to abut against the wall surface of the first valve port 516. The first sealing ring 581 is used to enhance the sealing effect of the piston 518 on the first valve port 516 to ensure no leakage when the male connector 510 is not assembled. Similarly, a second sealing ring 582 is sleeved outside the thimble 528, and a third sealing ring 583 is sleeved outside the valve sleeve 526 to further improve the sealing effect.

[0120] It is easy to understand that when the quick connector 500 (such as, the outdoor unit liquid pipe quick connector 7, the indoor unit liquid pipe quick connector 8, the indoor unit gas pipe quick connector 10, and the outdoor unit gas pipe quick connector 11) is tightened, the flow channel within the quick connector 500 is only at the sealing rings (i.e., the first sealing ring 581, the second sealing ring 582, and the third sealing ring 583), and the channel area is significantly reduced compared to a normal connecting pipe. When the air conditioner operates, the gaseous refrigerant is more likely to pass through, while the liquid oil has difficulty passing through. That is, the quick connector 500 has a certain blocking effect on the oil, causing the oil to stay within the evaporator or the gas pipe connecting pipe and unable to return to the compressor in time. When the operation time accumulates for a long time, the compressor is prone to being short of oil or even running out of oil, ultimately leading to wear and failure of the compressor. In this embodiment, the solenoid valve 5 is switched from the open state to the closed state to reduce the air flow rate within the liquid pipe connecting pipe and the gas pipe connecting pipe. Since the flow rate within the pipe is fixed, when the air flow rate decreases, the liquid flow rate increases accordingly, enabling the compressor 1 to draw back the oil in the evaporator 9 and the gas pipe connecting pipe using its own suction characteristics to achieve forced oil return.

[0121] It should be noted that when the preset conditions are met, that is, when it is determined that the compressor 1 needs to perform forced oil return, the operating frequency f of the compressor 1 can be first judged a whether it is less than the preset oil return frequency f ah , where the preset oil return frequency f ah can be set according to actual needs, and this embodiment does not limit this.

[0122] In a specific implementation, in order to further improve the oil return performance of the air conditioner, when the operating frequency f a is less than the preset oil return frequency f ah , the operating frequency f a can be increased to the preset oil return frequency f ah , and the solenoid valve 5 is closed to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor 1 sucks back the oil in the evaporator 9 and the gas pipe connecting pipe. Further, the closing time of the solenoid valve 5 can be recorded, and it is detected whether the closing time of the solenoid valve 5 is greater than the preset closing time t h . When the closing time of the solenoid valve 5 is greater than the preset closing time t h , the oil return ends, the solenoid valve 5 is switched back from the closed state to the open state, and the flow rate in the pipe is controlled by the second spool component 6, that is, mainly the second spool component 6 plays a throttling role, and the operating frequency f a is reduced to the frequency before oil return and continues to operate in the refrigeration mode or the dehumidification mode. Among them, the preset closing time t h can be set according to actual needs, and in this embodiment, it can be set to 20 s to 30 s.

[0123] In a specific implementation, in order to further improve the oil return performance of the air conditioner, when the operating frequency f a is greater than the preset oil return frequency f ah , the operating frequency f a is reduced to the preset oil return frequency f ah , and after a preset time delay t1, the solenoid valve 5 is closed (it can be understood that the compressor 1 closes the solenoid valve 5 after operating at the preset oil return frequency f ah for the preset time t1) to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor 1 sucks back the oil in the evaporator 9 and the gas pipe connecting pipe. Among them, the preset time delay t1 can be set according to actual needs. In this embodiment, it can be set to 30 s to 60 s. Further, the closing time of the solenoid valve 5 can also be recorded, and it is detected whether the closing time of the solenoid valve 5 is greater than the preset closing time t h . When the closing time of the solenoid valve 5 is greater than the preset closing time t h , the oil return ends, the solenoid valve 5 is switched back from the closed state to the open state, and the flow rate in the pipe is controlled by the second spool component 6, that is, mainly the second spool component 6 plays a throttling role, and the operating frequency f a is increased to the frequency before oil return and continues to operate in the refrigeration mode or the dehumidification mode.

[0124] It is easy to understand that when the quick connector 500 (such as the outdoor unit liquid pipe quick connector 7, the indoor unit liquid pipe quick connector 8, the indoor unit gas pipe quick connector 10 and the outdoor unit gas pipe quick connector 11) is tightened, the circulation channel in the quick connector 500 is only at the sealing ring, and the channel area will be greatly reduced relative to the ordinary connecting pipe. When the air conditioner is running, the gaseous refrigerant is easier to pass through, and the liquid oil is difficult to pass through, that is, the quick connector 500 has a certain blocking effect on the oil, so that the oil is retained inside the evaporator or inside the gas pipe connecting pipe, and cannot be returned to the compressor in time. When the running time accumulates for a long time, the compressor is prone to being in a state of less oil or even lack of oil, which eventually leads to the wear and failure of the compressor. In this embodiment, the solenoid valve 5 is switched from the open state to the closed state to reduce the gas flow in the liquid pipe connecting pipe and the gas pipe connecting pipe, and the flow in the pipe is fixed. When the gas flow is reduced, the liquid flow is correspondingly increased, and the compressor 1 uses its own suction characteristics to draw back the oil in the evaporator 9 and the gas pipe connecting pipe to achieve forced oil return. In this process, the operating frequency f of the compressor 1 is changed to a Adjust to the preset oil return frequency f ah , and maintain at the preset oil return frequency f ah , until the oil return is completed, so that after the compressor 1 starts the oil return operation, the oil return is more thorough, further improving the oil return effect.

[0125] It should be understood that the above is only an example and does not constitute any limitation on the technical solution of the present invention. In specific applications, technicians in this field can make settings as needed, and the present invention does not limit this.

[0126] In the present embodiment, when the air conditioner is provided with a quick connector and is in a preset operating mode, it is determined whether the preset conditions are met based on the operating frequency and operating time of the air conditioner compressor, that is, whether it is necessary to control the compressor for forced oil return is determined based on the operating mode of the air conditioner, the operating time of the air conditioner compressor and the operating frequency to improve the accuracy of the air conditioner oil return judgment. When the preset conditions are met, that is, when it is necessary to control the compressor for forced oil return, the solenoid valve is closed to reduce the air flow in the pipe so that the compressor draws back the oil in the evaporator and the air pipe connecting pipe. That is, the air flow in the pipe is reduced by closing the solenoid valve, and correspondingly, the liquid flow in the pipe is increased so that the compressor draws back the oil in the evaporator and the air pipe connecting pipe, so as to effectively improve the oil return performance of the air conditioner, extend the service life of the compressor, and improve the reliability of the air conditioner.

[0127] Other embodiments or specific implementations of the air conditioner oil return control device of the present invention can refer to the above-mentioned method embodiments, which will not be described in detail here.

[0128] It should be noted that in this document, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or system comprising such element.

[0129] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0130] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory / random access memory, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0131] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An oil return control method for an air conditioner, characterized in that, The air conditioner includes a compressor, an air pipe connecting pipe, an evaporator, a liquid pipe connecting pipe, and a condenser. Among them, the condenser is connected to the evaporator through the liquid pipe connecting pipe, the evaporator is connected to the compressor through the air pipe connecting pipe, a first valve core component and a second valve core component are connected in series on the liquid pipe connecting pipe, a solenoid valve is connected in parallel with the first valve core component, and the flow rate of the first valve core component is less than that of the second valve core component; The oil return control method of the air conditioner includes the following steps: When the air conditioner is provided with a quick connector and is in a preset operation mode, obtain the operation frequency and operation duration of the compressor of the air conditioner; Judge whether a preset condition is met according to the operation frequency and the operation duration; When the preset condition is met, set the solenoid valve to the closed state to reduce the air flow rate in the liquid pipe connecting pipe, and enable the compressor to draw back the oil in the evaporator and the air pipe connecting pipe; Among them, the step of judging whether a preset condition is met according to the operation frequency and the operation duration includes: Judge whether the operation frequency is less than a preset operation frequency; When the operation frequency is less than the preset operation frequency, judge whether the preset condition is met according to whether the operation duration is greater than a first operation duration; When the operation frequency is greater than the preset operation frequency, judge whether the preset condition is met according to whether the operation duration is greater than a second operation duration, and the second operation duration is greater than the first operation duration.

2. The air conditioner oil return control method according to claim 1, characterized in that, The step of, when the preset condition is met, setting the solenoid valve to the closed state to reduce the air flow rate in the liquid pipe connecting pipe, and enabling the compressor to draw back the oil in the evaporator and the air pipe connecting pipe includes: When the preset condition is met, adjust the operation frequency to a preset oil return frequency, and set the solenoid valve to the closed state to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor draws back the oil in the evaporator and the air pipe connecting pipe.

3. The air conditioner oil return control method according to claim 2, characterized in that, The step of, when the preset condition is met, adjusting the operation frequency to a preset oil return frequency, and setting the solenoid valve to the closed state to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor draws back the oil in the evaporator and the air pipe connecting pipe includes: When the preset condition is met, judge whether the operation frequency is less than the preset oil return frequency; When the operation frequency is less than the preset oil return frequency, increase the operation frequency to the preset oil return frequency, and set the solenoid valve to the closed state to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor draws back the oil in the evaporator and the air pipe connecting pipe.

4. The air conditioner oil return control method according to claim 3, wherein After the step of, when the preset condition is met, judging whether the operation frequency is less than the preset oil return frequency, it further includes: When the operation frequency is greater than the preset oil return frequency, reduce the operation frequency to the preset oil return frequency, and after delaying for a preset duration, set the solenoid valve to the closed state to reduce the air flow rate in the liquid pipe connecting pipe, so that the compressor draws back the oil in the evaporator and the air pipe connecting pipe.

5. The air conditioner oil return control method according to claim 1, characterized in that The quick connector includes a quick connector for the liquid pipe of the outdoor unit, a quick connector for the liquid pipe of the indoor unit, a quick connector for the gas pipe of the indoor unit, and a quick connector for the gas pipe of the outdoor unit; Among them, the quick connector for the liquid pipe of the outdoor unit and the quick connector for the liquid pipe of the indoor unit are arranged at both ends of the liquid pipe connecting pipe, and the quick connector for the gas pipe of the indoor unit and the quick connector for the gas pipe of the outdoor unit are arranged at both ends of the gas pipe connecting pipe.

6. An oil return control device for an air conditioner, characterized in that, The air conditioner includes a compressor, a gas pipe connecting pipe, an evaporator, a liquid pipe connecting pipe, and a condenser. Among them, the condenser is connected to the evaporator through the liquid pipe connecting pipe, the evaporator is connected to the compressor through the gas pipe connecting pipe, a first valve core component and a second valve core component are connected in series on the liquid pipe connecting pipe, a solenoid valve is connected in parallel with the first valve core component, and the flow rate of the first valve core component is less than the flow rate of the second valve core component; The oil return control device of the air conditioner includes: A data acquisition module, configured to acquire the operating frequency and operating duration of the compressor of the air conditioner when the air conditioner is equipped with a quick connector and is in a preset operating mode; A condition judgment module, configured to judge whether a preset condition is met according to the operating frequency and the operating duration; An oil return control module, configured to set the solenoid valve to a closed state when the preset condition is met, so as to reduce the gas flow rate in the liquid pipe connecting pipe, and enable the compressor to draw back the oil in the evaporator and the gas pipe connecting pipe; Among them, the condition judgment module is further configured to judge whether the operating frequency is less than a preset operating frequency; when the operating frequency is less than the preset operating frequency, judge whether the preset condition is met according to whether the operating duration is greater than a first operating duration; when the operating frequency is greater than the preset operating frequency, judge whether the preset condition is met according to whether the operating duration is greater than a second operating duration, and the second operating duration is greater than the first operating duration.

7. An air conditioner, characterized in that, The air conditioner includes: a memory, a processor, and an air conditioner oil return control program stored on the memory and executable on the processor. The air conditioner oil return control program is configured to implement the steps of the air conditioner oil return control method according to any one of claims 1 to 5.

8. A storage medium, characterized in that, An air conditioner oil return control program is stored on the storage medium. When the air conditioner oil return control program is executed by a processor, the steps of the air conditioner oil return control method according to any one of claims 1 to 5 are implemented.

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