Oil return control method and device for air conditioner and air conditioner

Abstract

The present invention relates to the technical field of air conditioning, and provides an oil return control method and device for an air conditioner, as well as an air conditioner. The oil return control method for the air conditioner comprises: obtaining the current solar power supply power of the air conditioner; when the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, controlling the compressor to start and operate at the lowest frequency, and using a phased frequency increase method to make the current operating frequency of the compressor reach the oil return target frequency for oil return operation. The present invention can improve the oil return effect when the compressor starts in application scenarios with power outages and insufficient lighting capacity, protect the compressor, and ensure stable operation of the air conditioner system, thereby ensuring a good user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an oil return control method and device for an air conditioner, and the air conditioner. Background Art

[0002] Solar air conditioners are air conditioners that use solar energy to supplement their cooling and heating functions. They typically use photovoltaic panels to power the air conditioner, offering energy-saving and environmentally friendly features. During operation, the compressor lubricant is discharged along with the refrigerant and then circulated back to the compressor to ensure proper operation. Therefore, oil return is required for compressor startup.

[0003] When a power outage occurs, the air conditioner is powered by solar energy. However, when the light capacity is insufficient, it will seriously affect the oil return effect when the compressor starts, resulting in poor oil return effect, which can easily cause damage to the compressor and abnormal operation of the air conditioner system, thus affecting the user experience. Summary of the Invention

[0004] The present invention provides an oil return control method and device for an air conditioner, and an air conditioner, for solving the defect in the related art that when a power outage occurs and the compressor is powered by solar energy and the illumination capacity is insufficient, the oil return effect when the compressor is started is poor. The present invention can start the compressor based on solar energy in this special application scenario, and improve the oil return effect when the compressor is started, thereby protecting the compressor and making the air conditioner system run stably, thereby ensuring the user experience.

[0005] The present invention provides an oil return control method for an air conditioner, comprising:

[0006] Get the current solar power supply power of the air conditioner;

[0007] When the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, the compressor is controlled to start running at the lowest frequency, and the frequency is increased in stages so that the current operating frequency of the compressor reaches the oil return target frequency for oil return operation.

[0008] According to the present invention, an oil return control method for an air conditioner is provided, wherein the steps of performing oil return operation by increasing the frequency in stages so that the current operating frequency of the compressor reaches the target oil return frequency are specifically as follows:

[0009] Controlling the compressor to perform a frequency boost at set intervals, and after each frequency boost, determining whether the current operating frequency of the compressor reaches the target oil return frequency;

[0010] If yes, control the compressor to stop frequency increase impact and perform oil return operation at the current operating frequency of the compressor;

[0011] If not, the compressor is controlled to continue frequency increase until the current operating frequency of the compressor reaches the oil return target frequency.

[0012] According to the present invention, an oil return control method for an air conditioner further comprises the steps of:

[0013] Obtaining the frequency increase impact number of the compressor;

[0014] In the process of controlling the frequency increase impact of the compressor so that the current operating frequency of the compressor reaches the target oil return frequency, the number of frequency increase impacts of the compressor is less than or equal to a preset target number;

[0015] When the frequency increase impact number of the compressor is greater than the preset target number and the current operating frequency of the compressor does not reach the oil return target frequency, the compressor is controlled to shut down.

[0016] According to the oil return control method for an air conditioner provided by the present invention, the set time length is 2 to 5 minutes.

[0017] According to the present invention, an oil return control method for an air conditioner further comprises the steps of:

[0018] Get the outdoor ambient temperature;

[0019] When the outdoor ambient temperature is lower than a first preset temperature and the compressor operates at the oil return target frequency, the solar energy storage device is controlled to power a heater, and the heater heats the oil return pipeline of the compressor for a first preset time.

[0020] According to the present invention, an oil return control method for an air conditioner further comprises the steps of:

[0021] When the outdoor ambient temperature is greater than or equal to the first preset temperature and less than a second preset temperature, controlling the heater to heat the oil return line of the compressor for a second preset time, and the second preset time is less than the first preset time;

[0022] When the outdoor ambient temperature is greater than or equal to the second preset temperature, the power supply circuit between the solar energy storage device and the heater is disconnected, and / or the heater is controlled to shut down.

[0023] According to the present invention, an oil return control method for an air conditioner further comprises the steps of:

[0024] In a case where the current solar power supply power reaches the maximum oil return power of the compressor, the compressor is controlled to operate normally with oil return at an operating frequency under the current solar power supply power.

[0025] According to an oil return control method for an air conditioner provided by the present invention, MPPT is used to obtain the current solar power supply power of the air conditioner.

[0026] The present invention also provides an oil return control device for an air conditioner, comprising:

[0027] An acquisition module is used to obtain the current solar power supply power of the air conditioner;

[0028] The control module is used to control the compressor to start and operate at the lowest frequency when the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, and to increase the frequency in stages so that the current operating frequency of the compressor reaches the oil return target frequency for oil return operation.

[0029] The present invention further provides an air conditioner, comprising: the oil return control device of the air conditioner, or the oil return control method of the air conditioner when performing oil return.

[0030] The oil return control method, device and air conditioner of the air conditioner provided by the present invention obtain the current solar power supply power of the air conditioner, and when the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, control the compressor to start and run at the lowest frequency, and use a staged frequency increase method to make the current operating frequency of the compressor reach the oil return target frequency for oil return operation. This can solve the power outage phenomenon in the related technology and the defect that the compressor starting oil return effect is poor when the power is supplied by solar energy and the lighting capacity is insufficient. The present invention can start the compressor based on solar energy in this special application scenario, improve the oil return effect when the compressor starts, protect the compressor, and make the air conditioner system run stably, thereby ensuring the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is one of the flow charts of the oil return control method for an air conditioner provided by the present invention;

[0033] Figure 2 This is the second flow chart of the oil return control method for the air conditioner provided by the present invention;

[0034] Figure 3 It is a structural schematic diagram of the oil return control device of the air conditioner provided by the present invention;

[0035] Figure 4It is a structural schematic diagram of the electronic device provided by the present invention.

[0036] Reference numerals:

[0037] 110: acquisition module; 120: control module;

[0038] 210: processor; 220: communication interface;

[0039] 230: memory; 240: communication bus. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0041] In the description of the embodiments of the present invention, it should be noted that the terms “first”, “second”, etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0042] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0043] The following combination Figure 1-Figure 4 The oil return control method and device of the air conditioner and the air conditioner of the present invention are described.

[0044] According to an embodiment of the first aspect of the present invention, referring to Figure 1 As shown, the oil return control method of the air conditioner provided by the present invention mainly includes:

[0045] S100: Obtain the current solar power supply power of the air conditioner.

[0046] S200: When the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, control the compressor to start operating at the lowest frequency, and increase the frequency in stages so that the current operating frequency of the compressor reaches the oil return target frequency for oil return operation.

[0047] The maximum compressor oil return power refers to the maximum operating power at which the compressor achieves the highest oil return volume or rate. The minimum compressor frequency refers to the operating frequency at which the compressor meets the oil return requirements after 6-8 hours of continuous low-frequency operation at low temperatures, as determined through an oil return test. Specifically, the oil return test can be conducted at an ambient temperature of 21°C using a 15-meter connecting hose (i.e., the oil return line).

[0048] Furthermore, the target oil return frequency can be understood as the operating frequency at which the oil return volume or oil return rate reaches the target oil return volume or target oil return rate. For example, the target oil return frequency can be the operating frequency at which the compressor oil return rate reaches 70% to 90%, and the specific oil return rate can reach 80%.

[0049] The oil return control method for an air conditioner provided in an embodiment of the present invention is mainly used in scenarios where there is no mains electricity and only new energy solar energy exists, and the oil return control of the air conditioner compressor is started based on solar energy. When a power outage occurs and the power is supplied by solar energy and the illumination capacity is insufficient, that is, when the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, the compressor is controlled to start and operate at the lowest frequency, and the current operating frequency of the compressor is increased in stages to reach the oil return target frequency for oil return operation. This ensures the oil return amount or oil return rate when the compressor starts, thereby resolving the defect of poor compressor startup oil return effect in related technologies. The present invention can improve the oil return effect when the compressor starts in special application scenarios where there is a power outage and insufficient illumination capacity, protect the compressor, and make the air conditioner system run stably, thereby ensuring the user experience.

[0050] According to one embodiment of the present invention, referring to Figure 2 As shown, the steps for performing oil return operation by increasing the current operating frequency of the compressor to the target oil return frequency in a phased frequency-raising manner specifically include:

[0051] S201 , controlling the compressor to perform a frequency increase shock at a set time interval, and after each frequency increase shock, determining whether the current operating frequency of the compressor reaches the target oil return frequency.

[0052] The set time may be 2 to 5 minutes. For example, the frequency boosting shock may be performed every 3 minutes.

[0053] S202: If yes, control the compressor to stop frequency increase impact and perform oil return operation at the current operating frequency of the compressor.

[0054] After the frequency increase impact, it is detected that the current operating frequency of the compressor reaches the oil return target frequency. At this time, the compressor is controlled to return oil at the current operating frequency, that is, to return oil at the oil return target frequency, thereby ensuring the oil return effect and protecting the compressor.

[0055] If not, control the compressor to continue frequency-raising until the current operating frequency of the compressor reaches the target oil return frequency.

[0056] After the frequency increase impact, it is detected that the current operating frequency of the compressor has not reached the target oil return frequency. At this time, the compressor is controlled to continue the frequency increase impact for the set time until the target oil return frequency is reached, thereby ensuring the oil return effect and protecting the compressor.

[0057] According to one embodiment of the present invention, the oil return control method for an air conditioner further includes the steps of:

[0058] Get the frequency of the compressor's frequency increase impact;

[0059] In the process of controlling the compressor frequency surge to make the current operating frequency of the compressor reach the target oil return frequency, the number of compressor frequency surges is less than or equal to the preset target number;

[0060] When the frequency increase impact number of the compressor is greater than the preset target number and the current operating frequency of the compressor does not reach the oil return target frequency, the compressor is controlled to shut down.

[0061] Specifically, the preset target frequency is the maximum frequency limit for the compressor to increase its frequency. Frequent frequency changes in the compressor are not conducive to oil return. Therefore, the present invention effectively protects the compressor by ensuring that the frequency of the compressor's frequency increase is less than or equal to the preset target frequency during the process of gradually increasing the frequency to the target oil return frequency. If the frequency of the compressor's frequency increase exceeds the preset target frequency and the compressor's current operating frequency has not yet reached the target oil return frequency, the compressor is controlled to shut down.

[0062] It is understandable that the specific value of the preset target number of times in the present invention is not particularly limited and can be designed according to the type of compressor and actual working conditions.

[0063] According to one embodiment of the present invention, the oil return control method for an air conditioner further includes the steps of:

[0064] Get the outdoor ambient temperature;

[0065] When the outdoor ambient temperature is lower than a first preset temperature and the compressor operates at an oil return target frequency, the solar energy storage device is controlled to power the heater, and the heater heats the oil return pipeline of the compressor for a first preset time.

[0066] Specifically, the photovoltaic panel is electrically connected to a solar energy storage device, which is electrically connected to the air conditioner and the heater, respectively. The heater is provided on the oil return line of the compressor. The electric energy generated by the photovoltaic panel is transmitted to the solar energy storage device for storage. When a power outage occurs, the solar energy storage device can be used to supply power to the air conditioner and the heater, respectively. Moreover, when the outdoor ambient temperature is lower than a first preset temperature, that is, when the outdoor temperature is low, the oil return effect of the compressor is poor. At this time, by controlling the heater to heat the oil return line of the compressor for a certain period of time, the oil return effect can be further improved. The specific types of the solar energy storage device and the heater of the present invention are not particularly limited. For example, the solar energy storage device can be a battery, and the heater can be a heating wire.

[0067] Furthermore, the oil return control method for the air conditioner according to the embodiment of the present invention further includes the steps of:

[0068] When the outdoor ambient temperature is greater than or equal to the first preset temperature and less than the second preset temperature, that is, the outdoor ambient temperature is medium, the heater is controlled to heat the compressor's oil return line for a second preset duration, and the second preset duration is shorter than the first preset duration. Because the temperature in this operating condition is relatively high compared to low temperature, the heater can be controlled to heat the compressor's oil return line for a duration shorter than the first preset duration. This can improve oil return efficiency and shorten the heater's operating time, achieving energy savings.

[0069] When the outdoor ambient temperature is greater than or equal to a second preset temperature, the outdoor ambient temperature is considered high. In this case, the power supply circuit between the solar energy storage device and the heater is disconnected, and / or the heater is controlled to shut down. It is understood that in high-temperature environments, oil return is more effective. In this case, there is no need to activate the heater, which can save energy.

[0070] Therefore, the embodiment of the present invention can achieve precise heating of the oil return pipeline of the compressor at different temperatures according to the outdoor ambient temperature, which can effectively improve the oil return effect and achieve the purpose of energy saving.

[0071] The above-mentioned preset time and preset temperature of the present invention can be designed according to actual working conditions. For example, the first preset time can be 20 to 30 minutes; the second preset time can be 5 to 15 minutes; the first preset temperature can be 21 to 23°C, and the second preset temperature can be 27 to 29°C.

[0072] According to one embodiment of the present invention, the oil return control method for an air conditioner further includes the step of: when the current solar power supply power reaches the maximum oil return power of the compressor, controlling the compressor to operate normally with oil return at the operating frequency under the current solar power supply power, so as to achieve the purpose of rapid oil return and ensure that the compressor starts and operates quickly.

[0073] According to an embodiment of the present invention, the current solar power supply power of the air conditioner can be obtained by using a method such as MPPT, where MPPT refers to maximum power point tracking.

[0074] The oil return control device for an air conditioner provided by the present invention is described below. The oil return control device for an air conditioner described below and the oil return control method for an air conditioner described above can be referred to each other.

[0075] According to an embodiment of the second aspect of the present invention, referring to Figure 3 As shown, the present invention also provides an oil return control device for an air conditioner, mainly comprising: an acquisition module 110 and a control module 120. The acquisition module 110 is mainly used to obtain the current solar power supply power of the air conditioner; the control module 120 is mainly used to control the compressor to start operating at the lowest frequency when the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, and to increase the frequency in stages so that the current operating frequency of the compressor reaches the target oil return frequency for oil return operation.

[0076] The oil return control device of the air conditioner in the embodiment of the present invention can control the compressor to start and operate at the lowest frequency when a power outage occurs and the power supply is solar energy and the lighting capacity is insufficient, and use a staged frequency increase method to make the current operating frequency of the compressor reach the oil return target frequency for oil return operation. This can improve the oil return effect when the compressor is started in this special application scenario, protect the compressor, and make the air conditioner system run stably, thereby ensuring the user experience.

[0077] According to one embodiment of the present invention, the acquisition module 110 is further configured to acquire the number of frequency surges of the compressor. During the process in which the control module 120 controls the frequency surge of the compressor to bring the current operating frequency of the compressor to the target oil return frequency, the number of frequency surges of the compressor is less than or equal to a preset target number. When the number of frequency surges of the compressor exceeds the preset target number and the current operating frequency of the compressor does not reach the target oil return frequency, the control module 120 controls the compressor to shut down. Setting the preset target number in this embodiment of the present invention can protect the compressor and extend its service life.

[0078] According to one embodiment of the present invention, the acquisition module 110 of the present invention is also used to obtain the outdoor ambient temperature. The control module 120 can accurately heat the oil return pipeline of the compressor at different temperatures according to the outdoor ambient temperature, which can effectively improve the oil return effect and achieve the purpose of energy saving.

[0079] According to an embodiment of the third aspect of the present invention, the present invention further provides an air conditioner, comprising: the oil return control device for the air conditioner according to the above embodiment, or, when performing oil return, employing the oil return control method for the air conditioner according to the above embodiment. The specific type of the air conditioner of the present invention is not particularly limited, and includes but is not limited to a solar air conditioner.

[0080] The air conditioner according to the embodiment of the present invention has the characteristics of good oil return effect, high reliability, stable operation, etc.

[0081] Figure 4 An example of a physical structure diagram of an electronic device is shown below. Figure 4 As shown, the electronic device may include: a processor 210, a communications interface 220, a memory 230, and a communications bus 240, wherein the processor 210, the communications interface 220, and the memory 230 communicate with each other via the communications bus 240. The processor 210 may call logic instructions in the memory 230 to execute an oil return control method for an air conditioner, the method comprising: obtaining the current solar power supply power of the air conditioner; if the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, controlling the compressor to start operating at the lowest frequency, and using a phased frequency increase method to bring the current operating frequency of the compressor to the target oil return frequency for oil return operation.

[0082] In addition, the logic instructions in the above-mentioned memory 230 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0083] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the oil return control method of the air conditioner provided by the above methods, which includes: obtaining the current solar power supply power of the air conditioner; when the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, controlling the compressor to start and operate at the lowest frequency, and in a staged frequency increase manner, making the current operating frequency of the compressor reach the oil return target frequency for oil return operation.

[0084] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the oil return control method for the air conditioner provided by the above-mentioned methods, the method comprising: obtaining the current solar power supply power of the air conditioner; when the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, controlling the compressor to start and operate at the lowest frequency, and in a staged frequency-increasing manner, making the current operating frequency of the compressor reach the oil return target frequency for oil return operation.

[0085] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0086] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An oil return control method for an air conditioner, characterized in that: include: Get the current solar power supply power of the air conditioner; In the event that the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, the compressor is controlled to start and operate at the lowest frequency, and the frequency is increased in stages so that the current operating frequency of the compressor reaches the target oil return frequency for oil return operation; the lowest frequency is the operating frequency at which the oil return of the compressor is qualified after continuous low-frequency operation for 6 to 8 hours at a low temperature, as determined by an oil return test; the target oil return frequency is the operating frequency at which the oil return amount or oil return rate reaches the target oil return amount or target oil return rate; the compressor is started based on solar energy; the maximum oil return power is the operating power at which the compressor oil return amount or oil return rate reaches the maximum; The step of performing oil return operation by increasing the frequency in stages so that the current operating frequency of the compressor reaches the target oil return frequency specifically includes: Controlling the compressor to perform a frequency boost at set intervals, and after each frequency boost, determining whether the current operating frequency of the compressor reaches the target oil return frequency; If yes, control the compressor to stop frequency increase impact and perform oil return operation at the current operating frequency of the compressor; If not, controlling the compressor to continue frequency increase until the current operating frequency of the compressor reaches the oil return target frequency; The method further comprises the steps of: Obtaining the frequency increase impact number of the compressor; In the process of controlling the frequency increase impact of the compressor so that the current operating frequency of the compressor reaches the target oil return frequency, the number of frequency increase impacts of the compressor is less than or equal to a preset target number; When the frequency increase impact number of the compressor is greater than the preset target number and the current operating frequency of the compressor does not reach the oil return target frequency, the compressor is controlled to shut down.

2. The oil return control method for an air conditioner according to claim 1, characterized in that: The set time is 2 to 5 minutes.

3. The oil return control method for an air conditioner according to claim 1 or 2, characterized in that: Also includes the steps: Get the outdoor ambient temperature; When the outdoor ambient temperature is lower than a first preset temperature and the compressor operates at the oil return target frequency, the solar energy storage device is controlled to power a heater, and the heater heats the oil return pipeline of the compressor for a first preset time.

4. The oil return control method for an air conditioner according to claim 3, characterized in that: Also includes the steps: When the outdoor ambient temperature is greater than or equal to the first preset temperature and less than a second preset temperature, controlling the heater to heat the oil return line of the compressor for a second preset time, and the second preset time is less than the first preset time; When the outdoor ambient temperature is greater than or equal to the second preset temperature, the power supply circuit between the solar energy storage device and the heater is disconnected, and / or the heater is controlled to shut down.

5. The oil return control method for an air conditioner according to claim 1 or 2, characterized in that: Also includes the steps: In a case where the current solar power supply power reaches the maximum oil return power of the compressor, the compressor is controlled to operate normally with oil return at an operating frequency under the current solar power supply power.

6. The oil return control method for an air conditioner according to claim 1 or 2, characterized in that: Use MPPT to obtain the current solar power supply power of the air conditioner.

7. An oil return control device for an air conditioner, characterized in that: include: An acquisition module is used to obtain the current solar power supply power of the air conditioner; a control module configured to, when the current solar power supply power does not reach the maximum oil return power of the air conditioner compressor, control the compressor to start and operate at a minimum frequency, and to increase the frequency in stages so that the current operating frequency of the compressor reaches a target oil return frequency for oil return operation; the minimum frequency being the operating frequency at which the oil return of the compressor is qualified after continuous low-frequency operation for 6 to 8 hours at a low temperature, as determined by an oil return test; the target oil return frequency being the operating frequency at which the oil return amount or oil return rate reaches a target oil return amount or target oil return rate; the compressor being started based on solar energy; and the maximum oil return power being the operating power at which the compressor oil return amount or oil return rate reaches the maximum; The control module is specifically configured to control the compressor to perform a frequency increase shock at intervals of a set duration, and after each frequency increase shock, determine whether the current operating frequency of the compressor reaches the oil return target frequency; The control module is further configured to, if yes, control the compressor to stop frequency-up shock and perform oil return operation at the current operating frequency of the compressor; if no, control the compressor to continue frequency-up shock until the current operating frequency of the compressor reaches the oil return target frequency; The acquisition module is further configured to acquire the number of frequency-increasing shocks of the compressor; The control module is specifically configured to control the frequency surge of the compressor so that the number of frequency surges of the compressor is less than or equal to a preset target number during the process of controlling the frequency surge of the compressor so that the current operating frequency of the compressor reaches the target oil return frequency; The control module is further configured to control the compressor to shut down when the frequency increase impact number of the compressor is greater than the preset target number and the current operating frequency of the compressor does not reach the oil return target frequency.

8. An air conditioner, characterized in that: include: The oil return control device for an air conditioner according to claim 7, or the oil return control method for an air conditioner according to any one of claims 1 to 6 when performing oil return.

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