A control method, device, air conditioner and storage medium for an air conditioner

Abstract

The present invention discloses a control method, device, air conditioner and storage medium for an air conditioner, including: obtaining the operating parameters and operating status of the air conditioner; selecting corresponding oil return conditions according to the operating parameters and operating status; obtaining the operating frequency of the compressor, and if the operating frequency of the compressor meets the oil return conditions, operating the oil return mode. By turning off the indoor fan in the refrigeration oil return mode and directly returning the mixture of refrigerant and lubricating oil to the compressor, or by turning off the outdoor fan in the heating oil return mode and directly returning the mixture of refrigerant and lubricating oil to the compressor, the present invention can reduce the power consumption of the air conditioner, enable the generator to output stably, reduce the damage to the generator, and also reduce the power supply parameter fluctuations and the damage to other electrical appliances. The present invention can be widely applied to the field of air conditioning technology.

Description

Technical Field

[0001] The present application relates to the field of air conditioners, and in particular to a control method, device, air conditioner and storage medium for an air conditioner. Background Art

[0002] With the development of technology, there are more and more air conditioner usage scenarios. In some areas with unstable power systems, power outages often occur, resulting in the inability to guarantee the quality of life of users. To ensure daily life, small generators are usually equipped in these areas with unstable power systems. When users use a generator to supply power to multiple electrical appliances simultaneously, the output power of the generator is limited. When multiple high-power electrical appliances (such as air conditioners, induction cookers, etc.) are running simultaneously, the electrical appliances will not be able to exert their maximum function; for such electrical appliances, their startup and operation under harsh working conditions will increase the current, which is not conducive to the normal use of the generator. To protect the generator and other electrical appliances, for high-power electrical appliances such as air conditioners, related technologies will control the entire air conditioner power by restricting the compressor frequency to ensure the stable operation of the entire generator power supply system. However, for such control methods, if the air conditioner compressor frequency is restricted too low and the compressor operates at a low frequency for a long time, the air conditioner needs to return oil. At this time, the compressor frequency needs to be increased, and then the air conditioner operating power increases, resulting in the total power consumption of the entire electrical appliance exceeding the rated power of the generator, causing fluctuations in the voltage and current of the entire system and harming the generator and other operating electrical appliances. How to enable the air conditioner to operate stably when powered by a generator and ensure the stability of the entire power system has become an urgent technical problem in the industry. Summary of the Invention

[0003] The embodiments of the present application provide a control method, device, air conditioner and storage medium for an air conditioner, which can enable the generator to supply power stably, reduce the fluctuations of power supply parameters, and reduce the damage to the generator and other electrical appliances.

[0004] According to one aspect of the embodiments of the present application, a control method for an air conditioner is provided, including:

[0005] Obtain the operating parameters and operating status of the air conditioner, where the operating parameters include indoor temperature, indoor fan speed, outdoor temperature, and outdoor fan speed, and the operating status includes cooling or heating;

[0006] Select a corresponding oil return condition according to the operating parameters and operating status, where the oil return condition refers to the conditions required to operate the oil return mode;

[0007] Obtain the compressor operating frequency. If the compressor operating frequency meets the oil return condition, operate the oil return mode;

[0008] Among them, the oil return mode includes a refrigeration oil return mode and a heating oil return mode; the refrigeration oil return mode means that the indoor fan is turned off during the oil return process, so that the mixture of refrigerant and lubricating oil flows back to the compressor; the heating oil return mode means that the outdoor fan is turned off during the oil return process, so that the mixture of refrigerant and lubricating oil flows back to the compressor.

[0009] Optionally, in an embodiment of the present application, before obtaining the operating parameters and operating status of the air conditioner, the control method further includes:

[0010] Obtain the total power of the power supply and the total power of the electrical appliances. If the total power of the power supply is less than the total power of the electrical appliances, determine the frequency of the compressor as the limit frequency.

[0011] Optionally, in an embodiment of the present application, a connecting pipe is provided between the outdoor heat exchanger of the air conditioner and the compressor, and the refrigerant and lubricating oil flow back to the compressor through the connecting pipe in the oil return mode.

[0012] In the embodiment of the present application, the method for obtaining the operating frequency of the compressor, if the operating frequency of the compressor meets the oil return condition, then operating the oil return mode specifically includes:

[0013] Obtain the operating frequency of the compressor;

[0014] If the operating frequency of the compressor is lower than the first frequency threshold included in the oil return condition, obtain the duration for which the operating frequency of the compressor is lower than the first frequency threshold included in the oil return condition;

[0015] If the duration is greater than the first preset time threshold included in the oil return condition, then operate the oil return mode.

[0016] Optionally, in an embodiment of the present application, the operation of the oil return mode specifically includes:

[0017] If the operating state of the air conditioner is refrigeration, turn off the indoor fan, control the compressor to operate at a preset oil return frequency for a preset oil return time, so that the mixture of refrigerant and lubricating oil does not flow back to the compressor through the indoor heat exchanger of the air conditioner;

[0018] If the operating state of the air conditioner is heating, turn off the outdoor fan, control the compressor to operate at a preset oil return frequency for a preset oil return time, so that the mixture of refrigerant and lubricating oil does not flow back to the compressor through the outdoor heat exchanger of the air conditioner.

[0019] Optionally, in an embodiment of the present application, after the compressor operates at a preset oil return frequency for a preset oil return time, the control method further includes:

[0020] If the operating state of the air conditioner is cooling, turn off the oil return mode, turn on the indoor fan, and control the mixture of refrigerant and lubricating oil to flow back to the compressor through the indoor heat exchanger;

[0021] If the operating state of the air conditioner is heating, turn off the oil return mode, turn on the outdoor fan, and control the mixture of refrigerant and lubricating oil to flow back to the compressor through the outdoor heat exchanger.

[0022] Optionally, in an embodiment of the present application, the operation of the oil return mode includes:

[0023] Obtain the current power of the air conditioner during operation;

[0024] If the current power is less than the power of the air conditioner before operating the oil return mode, increase the operating frequency of the compressor until the current power is equal to the power of the air conditioner before operating the oil return mode.

[0025] Optionally, in an embodiment of the present application, the control method further includes:

[0026] Count the number of times the air conditioner operates in the cooling oil return mode; if the number of times of the cooling oil return mode is greater than the first preset number threshold, then after the operation of the cooling oil return mode ends, operate the heating oil return mode;

[0027] Alternatively, count the number of times the air conditioner operates in the heating oil return mode. If the number of times of the heating oil return mode is greater than the second preset number threshold, then after the operation of the heating oil return mode ends, operate the cooling oil return mode.

[0028] Optionally, in an embodiment of the present application, the control method further includes:

[0029] If the operating frequency of the compressor is greater than the second frequency threshold included in the oil return condition, and the duration for which the operating frequency of the compressor is greater than the second frequency threshold included in the oil return condition is greater than the second preset time threshold, then clear and re - count the number of times of the cooling oil return mode and the heating oil return mode.

[0030] The beneficial effects of the embodiments of the present invention are as follows: By obtaining the operating parameters and operating status of the air conditioner, selecting the corresponding oil return condition according to the operating parameters and operating status, obtaining the operating frequency of the compressor, if the operating frequency of the compressor meets the oil return condition, then operating the oil return mode, that is, controlling the operation of the oil return mode according to the operating frequency of the compressor. By closing the indoor fan in the refrigeration oil return mode and directly returning the mixture of refrigerant and lubricating oil to the compressor, or by closing the outdoor fan in the heating oil return mode and directly returning the mixture of refrigerant and lubricating oil to the compressor, the power consumption of the air conditioner can be reduced, enabling the generator to output stably, reducing the damage to the generator, and also reducing the power supply parameter fluctuations and the damage to other electrical appliances.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 Structural schematic diagram of the air conditioner according to the embodiment of the present application;

[0034] Figure 2 Hardware structural schematic diagram of the air conditioner according to the embodiment of the present application;

[0035] Figure 3 Step flowchart of a control method for the air conditioner according to the embodiment of the present application;

[0036] Figure 4 Specific implementation process flowchart of applying the control method for the air conditioner according to the embodiment of the present application;

[0037] Figure 5 Structural schematic diagram of a control device for the air conditioner according to the embodiment of the present application;

[0038] Figure 6 Another structural schematic diagram of the control device for the air conditioner according to the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solution in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0040] The terms "first", "second", "third", "fourth", etc. in the description and claims of this application and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0041] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0042] In the related art, when a user uses a generator to supply power to multiple electrical appliances simultaneously, the output power of the generator is limited. When operating multiple high-power electrical appliances at the same time, for example, air conditioners, induction cookers, etc., high-power electrical appliances such as air conditioners will not be able to exert their maximum effect; and for electrical appliances such as air conditioners, their startup and operation under harsh conditions will increase the current, which will endanger the generator. To protect the generator and other electrical appliances, high-power electrical appliances such as air conditioners usually limit their power. For air conditioners, generally, the compressor frequency is used to control the overall power of the air conditioner to ensure the stable operation of the entire generator power supply system. However, for such a control method, if the compressor frequency of the air conditioner is limited too low and the compressor operates at a low frequency for a long time, the air conditioner needs to return oil. At this time, the compressor frequency needs to be increased, and then the operating power of the air conditioner increases, resulting in the total power consumed by all electrical appliances exceeding the rated power of the generator, causing fluctuations in the voltage and current of the entire system and endangering the generator and other operating electrical appliances.

[0043] To this end, the embodiments of the present application provide a control method, device, air conditioner, and storage medium for an air conditioner. By obtaining the operating parameters and operating states of the air conditioner, selecting corresponding oil return conditions according to the operating parameters and operating states, obtaining the operating frequency of the compressor, and if the operating frequency of the compressor meets the oil return conditions, operating the oil return mode, that is, controlling the operating oil return mode according to the operating frequency of the compressor. By closing the indoor fan in the refrigeration oil return mode and directly returning the mixture of refrigerant and lubricating oil to the compressor, or by closing the outdoor fan in the heating oil return mode and directly returning the mixture of refrigerant and lubricating oil to the compressor, the power consumption of the air conditioner can be reduced, enabling the generator to stably supply power output, reducing damage to the generator, and also reducing power supply parameter fluctuations and damage to other electrical appliances.

[0044] Referring to Figure 1 , in the embodiments of the present application, an air conditioner is provided, which includes a compressor 101, a four-way valve 102, an outdoor heat exchanger 103, a stop valve 104, a first electronic valve 105, a second electronic valve 106, an outdoor electronic controller 107, and an indoor heat exchanger 108. Among them, the outdoor heat exchanger 103 is arranged in the outdoor unit, and the compressor 101 and the indoor heat exchanger 108 are arranged in the indoor unit. The first electronic valve 105 and the second electronic valve 106 can be implemented by an electronic expansion valve or the like. It should be noted that only a part of the components of the air conditioner are exemplarily given in the embodiments of the present application, and the air conditioner may further include other components included in other existing air conditioning devices to achieve corresponding functions, which are not specifically limited. It should be noted that the air conditioner includes but is not limited to wall-mounted air conditioners, floor-standing air conditioners, window air conditioners, or ceiling-mounted air conditioners, etc.

[0045] Optionally, a connecting pipe is provided between the outdoor heat exchanger 103 and the compressor 101, and the refrigerant and lubricating oil return to the compressor 101 through this connecting pipe in the oil return mode. Exemplarily, this connecting pipe can pass through the outdoor electronic controller 107 and then be connected to the return air pipe 3 and then return to the compressor.

[0046] In the embodiments of the present application, the oil return mode can include a refrigeration oil return mode and a heating oil return mode; the refrigeration oil return mode means that the indoor fan is closed during the oil return process, and the mixture of refrigerant and lubricating oil directly returns to the compressor; the heating oil return mode means that the outdoor fan is closed during the oil return process, and the mixture of refrigerant and lubricating oil directly returns to the compressor. Taking Figure 1 the structure of Figure 1The function of the connecting pipe is that when the mixture of refrigerant and lubricating oil meets the oil return condition, it can directly flow back to the compressor 101 without passing through other components. In cooperation with the shutdown of the indoor fan or outdoor fan, it can reduce the overall size of the circulation system of the mixture of refrigerant and lubricating oil, and also reduce the operating power of the air conditioner, giving the air conditioner a greater power adjustment space. In this way, even if the compressor of the air conditioner operates at a low frequency for a long time, resulting in the need to increase the compressor frequency and the operating power of the air conditioner, due to the existence of the power adjustment space, it will not easily cause the total power consumed by the entire electrical appliance to exceed the rated power of the generator, enabling the generator to supply power stably.

[0047] Refer to Figure 2 , Figure 2 FIG. is a schematic diagram of the hardware structure of the air conditioner involved in various embodiments of the present application. In the embodiments of the present application, a mobile air conditioner may include a processor 2001 (such as a central processing unit, CPU), a communication bus 2002, an input port 2003, an output port 2004, and a memory 2005. Among them, the communication bus 2002 is used to realize the connection and communication between these components; the input port 2003 is used for data input; the output port 2004 is used for data output, and the memory 2005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 2005 may also be a storage device independent of the aforementioned processor 2001. Those skilled in the art can understand that Figure 2 the hardware structure shown in FIG. does not constitute a limitation to the present application, and may include more or fewer components than shown, or combine some components, or have different component arrangements.

[0048] Continue to refer to Figure 2 , Figure 2 In FIG., the memory 2005 as a readable storage medium may include an operating system, a network communication module, an application program module, and a control program for the air conditioner. In Figure 2 FIG., the network communication module is mainly used to connect to the server and communicate with the server for data; and the processor 2001 can call the control program for the air conditioner stored in the memory 2005 and execute the control method for the air conditioner provided by the embodiments of the present application.

[0049] Based on Figure 1 and Figure 2 the mechanical structure and hardware structure of the air conditioner shown in FIG., as shown in Figure 3 FIG., the embodiments of the present application provide a control method for an air conditioner, including but not limited to steps S301, S302, S303, S304, and S305:

[0050] S301. Obtain the operating parameters and operating status of the air conditioner.

[0051] It should be noted that the operating parameters in step S301 include the indoor temperature, indoor fan speed, outdoor temperature, and outdoor fan speed, and the operating status includes cooling or heating. The indoor temperature and outdoor temperature in the operating parameters can be obtained through temperature sensors and other devices equipped on the air conditioner, and the obtained temperature data is transmitted to the processor; the indoor fan speed and outdoor fan speed in the operating parameters can be obtained by measuring the blade speeds of the indoor fan and outdoor fan of the air conditioner, and the measured speed data is transmitted to the processor.

[0052] The operating status refers to the operating mode of the air conditioner, which can include two modes: cooling and heating. The operating status can also include common modes of the air conditioner such as dehumidification, drying, sterilization, and purification, and their operating principles are similar to those of the cooling and heating modes. That is to say, the control scheme of the air conditioner in the cooling and heating modes in the embodiments of the present application can also be extended to the control schemes of the air conditioner in other modes such as dehumidification, drying, sterilization, and purification.

[0053] S302. Select the corresponding oil return condition according to the operating parameters and operating status.

[0054] In step S302, the oil return condition refers to the conditions that need to be met for the operation of the oil return mode. It can be understood that different oil return conditions can be preset or pre-configured according to actual different needs. Optionally, the oil return condition is related to parameters such as the indoor fan speed and outdoor fan speed, indoor temperature and outdoor temperature, and can also be related to the operating status of the air conditioner. That is to say, different oil return conditions can be comprehensively selected according to different indoor fan speeds and outdoor fan speeds, indoor temperature and outdoor temperature, etc., combined with different operating statuses of the air conditioner.

[0055] In the embodiments of the present application, the oil return condition can be characterized or described by parameters such as the limited oil return frequency and continuous operation time of the compressor.

[0056] Exemplarily, when the operating status of the air conditioner is cooling, the corresponding oil return condition can be determined according to Table 1 below:

[0057] Table 1 Oil return conditions for different outdoor temperatures and indoor speeds when the air conditioner operates in the cooling mode

[0058]

[0059] As shown in Table 1 above, when the outdoor temperature is less than or equal to 30 °C and the outdoor fan speed is less than or equal to 400 rpm / min, the first frequency threshold (i.e., the limited oil return frequency) F included in the oil return condition 回油The oil return condition includes the first preset time threshold (i.e., continuous running time) t 回油 For 30 minutes, that is, when the compressor operating frequency of the air conditioner is lower than the first frequency threshold of 30Hz and lasts for 30 minutes, the air conditioner starts to run in the oil return mode. Similarly, when the outdoor temperature is between 30℃ and 40℃ and the outdoor fan speed is greater than or equal to 600rpm / min, the oil return condition includes the first frequency threshold F 回油 The oil return condition includes the first preset time threshold t 回油 For 40 minutes, that is, when the compressor operating frequency of the air conditioner is lower than the first frequency threshold of 25Hz for 40 minutes, the air conditioner starts to run in the oil return mode. Similarly, when the outdoor temperature is greater than or equal to 40℃ and the outdoor fan speed is between 400rpm / min and 600rpm / min, the oil return condition includes the first frequency threshold F 回油 The oil return condition includes the first preset time threshold t 回油 The oil return mode is 35 minutes, that is, when the compressor operating frequency of the air conditioner is lower than the first frequency threshold of 20Hz for 35 minutes, the air conditioner begins to operate in the oil return mode. Therefore, the oil return conditions, namely the first frequency threshold and the first preset time threshold, will change to corresponding preset values depending on the speed of the indoor and outdoor fans and the indoor and outdoor temperatures. Table 1 shows the oil return conditions for different outdoor temperatures and outdoor fan speeds when the air conditioner is in the cooling working state. Correspondingly, the oil return conditions for different indoor temperatures and indoor fan speeds when the air conditioner is in the cooling working state, the oil return conditions for different outdoor temperatures and outdoor fan speeds when the air conditioner is in the heating working state, and the oil return conditions for different indoor temperatures and indoor fan speeds when the air conditioner is in the heating working state are similar to Table 1 and will not be repeated here.

[0060] S303: Obtain the operating frequency of the compressor.

[0061] As can be seen from the previous description, in order to avoid exceeding the rated power of the generator, the operating frequency of the compressor (including the operating frequency during oil return) is limited. Therefore, in order to facilitate the subsequent determination of whether the oil return conditions are met, it is necessary to first obtain the compressor operating frequency. This embodiment of the application does not specifically limit the method for obtaining the compressor operating frequency. It can be obtained by measuring with a multimeter, reading the reading of the frequency detection device built into the air conditioner, etc.

[0062] S304: Determine whether the compressor operating frequency meets the oil return condition.

[0063] As can be known from the previous description or prior knowledge, whether oil return is required is related to the operating frequency of the compressor and also to the duration of the compressor running continuously at a relatively low frequency. Therefore, step 304 can be further divided into the following steps S3041, S3042, and S3043:

[0064] S3041. Determine whether the operating frequency of the compressor is lower than the first frequency threshold included in the oil return condition.

[0065] Among them, the first frequency threshold is used to represent whether the current operating frequency of the compressor meets the frequency requirement for the oil return mode. The specific numerical value of the first frequency threshold can be selected according to actual needs, and the embodiments of the present application do not make specific limitations on this.

[0066] S3042. If the operating frequency of the compressor is lower than the first frequency threshold included in the oil return condition, obtain the duration for which the operating frequency of the compressor is lower than the first frequency threshold included in the oil return condition.

[0067] According to the previous description, in addition to the requirement that the operating frequency of the compressor needs to meet the requirement of being lower than the first frequency threshold, whether to operate the oil return mode also requires determining whether the duration of the compressor running at a frequency lower than the first frequency threshold reaches a preset duration (i.e., the first preset time threshold). Therefore, step S3042 needs to obtain the duration for which the operating frequency of the compressor is lower than the first frequency threshold included in the oil return condition.

[0068] S3043. Determine whether the duration is greater than the first preset time threshold included in the oil return condition.

[0069] In step S3043 of the embodiments of the present application, the first preset time threshold is used to measure or represent whether the duration of the compressor running at a frequency lower than the first frequency threshold meets the time requirement. It can be understood that the specific numerical value of the first preset time threshold can be selected according to actual needs, and the embodiments of the present application do not make specific limitations on this.

[0070] Those skilled in the art can understand that steps S3041 - S3043 only illustrate a specific implementation manner for determining that the operating frequency of the compressor meets the oil return condition, and do not constitute a limitation to the present invention. Other implementation manners can also be adopted. For example, the current operating frequency of the compressor and the duration of continuous operation at the current operating frequency are obtained in parallel, and then it is determined whether the current operating frequency and the duration simultaneously meet the frequency requirement and the continuous operation time requirement of the oil return mode, etc.

[0071] S305. If the duration is greater than the first preset time threshold included in the oil return condition, operate the oil return mode.

[0072] In step S305, after it is determined in step S304 that the operating frequency of the compressor meets the oil return condition, the corresponding oil return mode can be operated.

[0073] Before operating the oil return mode in the embodiment of the present application, it is necessary to select the oil return condition. Before selecting the oil return condition, the processor will use the operating state of the air conditioner as one of the selection bases, that is, when the air conditioner is in the cooling operating state, the cooling oil return mode is selected, and when the air conditioner is in the heating operating state, the heating oil return mode is selected. This is because when the operating state of the air conditioner is different, the flow directions of the internal coolant and lubricating oil are different, and the working states of related components are also different. Therefore, it is necessary to select the corresponding oil return mode according to different operating states to prevent the air conditioner from malfunctioning due to incorrect selection of the mode during operation.

[0074] Therefore, in step S305, the oil return mode includes a cooling oil return mode and a heating oil return mode; the cooling oil return mode means that the indoor fan is turned off during the oil return process, so that the mixture of refrigerant and lubricating oil directly returns to the compressor; the heating oil return mode means that the outdoor fan is turned off during the oil return process, so that the mixture of refrigerant and lubricating oil directly returns to the compressor. That is, the cooling oil return mode is the oil return mode that can be operated when the air conditioner is in the cooling state, and the heating oil return mode is the oil return mode that can be operated when the air conditioner is in the heating state.

[0075] It should be noted that the specific operation of the oil return mode in the foregoing step S305 includes:

[0076] If the operating state of the air conditioner is cooling, the indoor fan is turned off, and the compressor is controlled to operate at a preset oil return frequency for a preset oil return time, so that the mixture of refrigerant and lubricating oil does not pass through the indoor heat exchanger and returns to the compressor;

[0077] If the operating state of the air conditioner is heating, the outdoor fan is turned off, and the compressor is controlled to operate at a preset oil return frequency for a preset oil return time, so that the mixture of refrigerant and lubricating oil does not pass through the outdoor heat exchanger and returns to the compressor.

[0078] In the embodiment of the present application, the oil return mode is an operating mode that returns oil while reducing the compressor frequency. It should be noted that during the operation of the air conditioner, the lubricating oil of the compressor will be discharged from the compressor together with the refrigerant and enter components such as the condenser, piping, and evaporator of the air conditioner. This part of the discharged lubricating oil needs to be smoothly returned to the compressor to maintain the dynamic balance of the oil in the entire system. Otherwise, the compressor will be damaged due to lack of oil. Therefore, the process of the mixture of lubricating oil and coolant from being discharged from the compressor to returning to the compressor is the oil return process in the embodiment of the present application. Oil return is an important process to keep the compressor running normally during the operation of the air conditioner. If it runs without lubricating oil, the compressor will burn out due to wear and overheating.

[0079] In step S305, the refrigeration oil return mode and the heating oil return mode can be achieved by combining the connecting pipes shown above Figure 1 and the on-off control of the stop valve 104, the first electronic valve 105 and the second electronic valve 106. Specifically, when the air conditioner is in the normal operating state, the indoor fan and the outdoor fan operate simultaneously. When the air conditioner operates in the aforementioned oil return mode, the operating conditions of the indoor fan and the outdoor fan will change according to the different operating states of the air conditioner. When the operating state of the air conditioner is the refrigeration state, after entering the oil return state, the indoor fan is turned off, and the outdoor fan is kept in the normal operating state; at the same time, control Figure 1 the stop valve 104 and the first electronic valve 105 in it to open, and control the second electronic valve 106 to close, so that the mixture of refrigerant and lubricating oil does not flow back to the compressor through the indoor heat exchanger 108, that is, the mixture of refrigerant and lubricating oil directly flows from the outdoor heat exchanger 103 to the compressor 101 through the connecting pipe between the outdoor heat exchanger 103 and the compressor 101 (through the outdoor electronic controller 107), without passing through the indoor heat exchanger 108, reducing the overall size of the circulation system that the mixture of refrigerant and lubricating oil has to pass through, and also reducing the power of the air conditioner in the case of oil return. When the operating state of the air conditioner is the heating state, after entering the oil return state, the outdoor fan is turned off, and the indoor fan is kept in the normal operating state. At the same time, control Figure 1 the stop valve 104 and the second electronic valve 106 in it to close, and control the first electronic valve 105 to open, so that the mixture of refrigerant and lubricating oil flows back to the compressor, that is, the mixture of refrigerant and lubricating oil directly flows to the compressor 101 through the connecting pipe between the first electronic valve 105 and the compressor 101 (through the outdoor electronic controller 107), without passing through the outdoor heat exchanger 103, reducing the overall size of the circulation system that the mixture of refrigerant and lubricating oil has to pass through, and reducing the power of the air conditioner in the case of oil return. Through the aforementioned two oil return modes, one of the indoor fan or the outdoor fan is turned off, reducing the overall power of the air conditioner while being able to return oil normally, being able to reduce the power of the air conditioner in the case of oil return, keeping the generator's output stable, reducing the damage to the generator, and also being able to reduce the power supply parameter fluctuations and the damage to other electrical appliances.

[0080] It can be understood that during the operation of the above refrigeration oil return mode, the mixture of refrigerant and lubricating oil does not pass through the indoor heat exchanger, but directly returns to the compressor through the connecting pipe between the outdoor heat exchanger 103 and the compressor 101. Therefore, in order to further reduce the overall operating power of the air conditioner, the indoor heat exchanger can also be closed during the oil return process, giving the air conditioner a greater power adjustment space. Similarly, during the heating oil return mode, the mixture of refrigerant and lubricating oil does not pass through the outdoor heat exchanger, but directly returns to the compressor through the connecting pipe between the outdoor heat exchanger 103 and the compressor 101. Therefore, in order to further reduce the overall operating power of the air conditioner, the outdoor heat exchanger can also be closed during the oil return process, giving the air conditioner a greater power adjustment space. In this way, even if the compressor of the air conditioner runs at a low frequency for a long time, resulting in the need to increase the compressor frequency and the operating power of the air conditioner, due to the existence of the power adjustment space, it will not easily cause the total power consumed by the entire electrical appliance to exceed the rated power of the generator, enabling the generator to supply power stably.

[0081] In the embodiment of the present application, after the compressor operates at a preset oil return frequency for a preset oil return time, the control method of the air conditioner further includes the following steps:

[0082] If the operating state of the air conditioner is refrigeration, close the oil return mode, turn on the indoor fan, and control the mixture of refrigerant and lubricating oil to return to the compressor through the indoor heat exchanger;

[0083] If the operating state of the air conditioner is heating, close the oil return mode, turn on the outdoor fan, and the mixture of refrigerant and lubricating oil returns to the compressor through the outdoor heat exchanger.

[0084] In the embodiment of the present application, the preset oil return time specifically refers to the preset time for operating the oil return mode, and the magnitude of the preset oil return time can be changed according to different specific parameters such as the model and power of the air conditioner. Exemplarily, if the preset oil return time is 4 minutes, then: the air conditioner maintains the oil return mode for 4 minutes, and closes the oil return mode after the running time reaches 4 minutes.

[0085] In the embodiment of the present application, closing the oil return mode may specifically include:

[0086] Turn on the previously closed fan, such as turning on the previously closed indoor fan in the refrigeration mode and turning on the previously closed outdoor fan in the heating mode; at the same time, close the electronic valve (i.e., the second electronic valve) of the connecting pipe between the aforementioned outdoor heat exchanger and the indoor heat exchanger, so that the mixture of refrigerant and lubricating oil returns to the compressor through the indoor heat exchanger in the refrigeration mode, and the mixture of refrigerant and lubricating oil returns to the compressor through the outdoor heat exchanger in the heating mode, and control the air conditioner to resume the normal operating state.

[0087] Optionally, when operating the oil return mode in step S305, it may further include:

[0088] Obtain the current power of the air conditioner during operation; if the current power is less than the power of the air conditioner before operating the oil return mode, increase the operating frequency of the compressor until the current power is equal to the power of the air conditioner before operating the oil return mode.

[0089] In the oil return mode described in step S305 above, a compressor power adjustment function can also be added. The specific function is as follows: Detect the current power of the air conditioner during current operation at regular intervals, compare the detected current power with the power of the air conditioner before the oil return mode recorded previously, and judge the magnitude relationship between the current power and the power of the air conditioner before the oil return mode recorded previously: If the current power is less than the power of the air conditioner before operating the oil return mode, synchronously increase the operating frequency of the compressor so that the operating power of the compressor also increases until the current power is equal to the power of the air conditioner before operating the oil return mode. Among them, the interval time can be changed according to the needs of users and designers, and can be, but not limited to, a time interval of 10 seconds. The compressor power adjustment function provided by the embodiments of the present application can detect the operating power of the compressor to judge whether the operating power of the compressor is lower than the power of the air conditioner before the oil return mode. If the operating power of the compressor is lower than the power of the air conditioner before the oil return mode, it means that the operating power of the compressor fluctuates, that is, the operating frequency of the compressor fluctuates, which will cause fluctuations in electrical parameters such as the current and voltage of the air conditioner and is not conducive to the normal operation of the air conditioner.

[0090] From the above description, it can be known that the compressor power adjustment function provided by the embodiments of the present application can stabilize the operating frequency of the compressor, keep the operating frequency of the compressor within a relatively stable range, which is beneficial to the normal operation of the air conditioner circuit, reduces the unstable factors of the air conditioner circuit, prolongs the service life of each component in the air conditioner circuit, reduces the damage to the generator, and can also reduce the fluctuations of power supply parameters and the damage to other electrical appliances.

[0091] Optionally, when operating the oil return mode in step S305, it can be to first operate the heating oil return mode and then the cooling oil return mode, or first operate the cooling oil return mode and then the heating oil return mode, similar to the iterative operation of the program. The switching between the heating oil return mode and the cooling oil return mode can be achieved through Figure 1 a four-way valve. The basis for switching can be the number of times of operating a certain oil return mode, the duration of operating a certain oil return mode, etc. The present application does not make specific limitations on this.

[0092] For example, if the switching basis is the number of times of operating a certain oil return mode, then operating the oil return mode in step S305 may further include the following steps:

[0093] Count the number of times the air conditioner operates in the refrigeration oil return mode;

[0094] If the number of times of the refrigeration oil return mode is greater than the first preset number threshold, after the operation of the refrigeration oil return mode ends, operate the heating oil return mode;

[0095] Alternatively, count the number of times the air conditioner operates in the heating oil return mode;

[0096] If the number of times of the heating oil return mode is greater than the second preset number threshold, after the operation of the heating oil return mode ends, operate the refrigeration oil return mode.

[0097] In the embodiments of the present application, the first preset number threshold and the second preset number threshold may be the same or different, and the numerical values can be selected according to the needs of time. For example, the first preset number threshold can be selected as 5 times according to parameters such as the model and power of the air conditioner, and the second preset number threshold can be 3 times or 5 times, etc.

[0098] It should be noted that if the operating frequency of the compressor is greater than the second frequency threshold included in the oil return condition, and the duration for which the operating frequency of the compressor is greater than the second frequency threshold included in the oil return condition is greater than the second preset time threshold, then the number of times of the aforementioned refrigeration oil return mode and heating oil return mode is cleared and re-counted. The second preset time threshold may vary according to different parameters such as the model and power of the air conditioner.

[0099] Specifically, if the first preset number threshold is 5 times, the air conditioner is in the refrigeration state, and the second preset time threshold is 30 min, when the number of times N of the aforementioned air conditioner running for oil return ≥ 5 times, after the operation of the refrigeration oil return mode of the air conditioner ends, the four-way valve changes the direction and the air conditioner operates in the heating oil return mode. After the operation of the heating oil return mode ends, the air conditioner starts normal operation; if the air conditioner runs for oil return and operates for more than 30 min when the operating frequency of the air conditioner is greater than the second frequency threshold included in the oil return condition, the number of times N of the air conditioner running for oil return is cleared and re-counted.

[0100] Correspondingly, if the second preset number threshold is 3 times, when the air conditioner is in the heating state and the second preset time threshold is 30 min, when the number of times N of the aforementioned air conditioner running for oil return ≥ 3 times, after the operation of the heating oil return mode of the air conditioner ends, the four-way valve changes the direction to make the air conditioner operate in the refrigeration oil return mode. After the operation of the refrigeration oil return mode ends, the air conditioner starts normal operation; when the air conditioner runs for oil return and operates for more than 30 min when the operating frequency of the air conditioner is greater than the second frequency threshold included in the oil return condition, the number of times N of the air conditioner running for oil return is cleared and re-counted. Among them, the second frequency threshold is a preset value included in the oil return condition and can be obtained after selecting the oil return condition.

[0101] The embodiments of the present application can record the number of times the air conditioner operates in the oil return mode, and after the number of times the air conditioner operates in the oil return mode reaches the preset oil return times N, reverse the four-way valve to make the air conditioner operate in another corresponding oil return mode. After meeting the requirements, clear the number of times N of the air conditioner operating in the oil return mode and re-count, which can effectively avoid the aging of the air conditioner circuit and the damage of components caused by the air conditioner operating in one oil return mode for a long time, and extend the service life and maintenance cycle of the air conditioner.

[0102] For another example, if the switching basis is the continuous duration of a certain oil return mode operation, then the operation of the oil return mode in step S305 may further include the following steps:

[0103] When the air conditioner is in the cooling operation state, record the continuous operation time of the air conditioner operating in the cooling oil return mode. If the continuous operation time of the air conditioner operating in the cooling oil return mode is greater than the first switching time threshold, then after the operation of the cooling oil return mode ends, operate the heating oil return mode;

[0104] Or, when the air conditioner is in the heating operation state, record the continuous operation time of the air conditioner operating in the heating oil return mode. If the continuous operation time of the air conditioner operating in the heating oil return mode is greater than the second switching time threshold, then after the operation of the heating oil return mode ends, operate the cooling oil return mode.

[0105] In the embodiments of the present application, the first switching time threshold and the second switching time threshold may be the same or different, and the numerical values can be selected according to actual needs. For example, according to parameters such as the model and power of the air conditioner, both the first switching time threshold and the second switching time threshold can be selected as 2 hours, etc.

[0106] The embodiments of the present application can record the continuous duration of the air conditioner operating in the oil return mode, and after the continuous duration of the air conditioner operating in the oil return mode reaches the preset switching time threshold, reverse the four-way valve to make the air conditioner operate in another corresponding oil return mode, which can effectively avoid the aging of the air conditioner circuit and the damage of components caused by the air conditioner operating in one oil return mode for a long time, and extend the service life and maintenance cycle of the air conditioner.

[0107] Optionally, the control method of the air conditioner in the embodiments of the present application may further include the following steps:

[0108] S306. Obtain the total power of the power supply and the total power of the electrical appliances. If the total power of the power supply is less than the total power of the electrical appliances, determine the frequency of the compressor as the limit frequency.

[0109] In the embodiments of the present application, in order to make the power supply of the generator stable and protect the safe operation of other electrical appliances, the air conditioner reduces the operating frequency of the whole air conditioner by restricting the frequency, that is, the processor reduces the operating frequency of the compressor to the restricted frequency, thereby reducing the power of the air conditioner and achieving the effect of reducing frequency and power consumption. Optionally, when the processor reduces the operating frequency of the compressor to the restricted frequency, it can also monitor and record the power of the whole air conditioner as the original data for subsequent power consumption data analysis.

[0110] Based on the foregoing description, taking the initial operating state as refrigeration and then operating in the refrigeration mode as an example, as Figure 4 shown, the control method of the air conditioner in the embodiments of the present application specifically includes the following steps:

[0111] Step S401: Obtain the operating parameters and operating state of the air conditioner;

[0112] Step S402: Select the corresponding oil return condition according to the operating parameters and operating state;

[0113] Step S403: Obtain the operating frequency of the compressor;

[0114] Step S404: Determine whether the operating frequency of the compressor is lower than the first frequency threshold included in the oil return condition;

[0115] Step S405: If the operating frequency of the compressor is lower than the first frequency threshold included in the oil return condition, obtain the duration for which the operating frequency of the compressor is lower than the first frequency threshold included in the oil return condition;

[0116] Step S406: Determine whether the duration is greater than the first preset time threshold included in the oil return condition;

[0117] Step S407: If the duration is greater than the first preset time threshold included in the oil return condition, run the oil return mode.

[0118] In the embodiments of the present application, it is assumed that the air conditioner operates in the refrigeration mode. When the total power consumed by all electrical appliances exceeds the power of the generator, the operating parameters and operating state of the air conditioner are obtained through step S401, the corresponding oil return condition is selected from the data in Table 1 according to the results of the operating parameters and operating state through step S402, the operating frequency of the compressor is obtained through step S403, and it is determined through steps S404 - S406 whether the operating frequency of the compressor meets the oil return condition. If the operating frequency of the compressor meets the oil return condition, the refrigeration oil return mode is run through step S407. At this time, turn off Figure 1The electronic valve of the connecting pipe between the indoor heat exchanger and the outdoor heat exchanger (i.e., the second electronic valve 106) is opened, and the electronic valve of the connecting pipe between the outdoor heat exchanger and the compressor (i.e., the first electronic valve 105) is opened. At the same time, the indoor fan is turned off. At this time, the mixture of lubricating oil and refrigerant does not flow through the indoor heat exchanger, the volume and power of the entire refrigeration system are reduced, and at the same time, since the indoor fan is turned off, the power of the entire air conditioner is reduced.

[0119] The current power of the air conditioner during current operation can be detected every certain period of time (such as 10 seconds), and the detected current power is compared with the power of the air conditioner before the oil return mode recorded previously to determine the magnitude relationship between the current power and the power of the air conditioner before the oil return mode recorded previously. If the current power is less than the power of the air conditioner before operating the oil return mode, the operating frequency of the compressor is increased so that the operating power of the compressor also increases until the current power is equal to the power of the air conditioner before operating the oil return mode.

[0120] After running for a period of time, the number of times the air conditioner operates in the refrigeration oil return mode can be counted; if the number of times of the refrigeration oil return mode is greater than the first preset number threshold (such as 5 times), then after the operation of the refrigeration oil return mode ends, the heating oil return mode is operated.

[0121] As can be seen from the above content, in the case where the total power of the electrical appliance exceeds the power of the generator in the embodiment of the present application, the corresponding oil return conditions are selected according to the operating parameters and operating states, the operating frequency of the compressor is obtained to control the operating oil return mode. By turning off the indoor fan in the refrigeration oil return mode and directly returning the mixture of refrigerant and lubricating oil to the compressor, or by turning off the outdoor fan in the heating oil return mode and directly returning the mixture of refrigerant and lubricating oil to the compressor, the power consumption of the air conditioner can be reduced, enabling the generator to output stably, reducing the damage to the generator, and also reducing the power supply parameter fluctuations and the damage to other electrical appliances.

[0122] Refer to Figure 5 , the embodiment of the present invention also provides a control device for an air conditioner, including:

[0123] An acquisition module 500, configured to acquire the operating parameters and operating states of the air conditioner, where the operating parameters include indoor temperature, indoor fan speed, outdoor temperature, and outdoor fan speed, and the operating states include refrigeration or heating;

[0124] A selection module 501, configured to select corresponding oil return conditions according to the operating parameters and operating states, where the oil return conditions refer to the conditions required for operating the oil return mode;

[0125] An operation module 502 is configured to obtain the operating frequency of the compressor. If the operating frequency of the compressor meets the oil return condition, the oil return mode is operated, where the oil return mode includes a refrigeration oil return mode and a heating oil return mode; the refrigeration oil return mode means that the indoor fan is turned off during the oil return process to allow the mixture of refrigerant and lubricating oil to flow back to the compressor; the heating oil return mode means that the outdoor fan is turned off during the oil return process to allow the mixture of refrigerant and lubricating oil to flow back to the compressor.

[0126] It can be seen that the content in the above method embodiments is applicable to the device embodiments of the present invention. The functions specifically implemented by the device embodiments of the present invention are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those in the above method embodiments.

[0127] Refer to Figure 6 , an embodiment of the present application provides a control device for an air conditioner, including:

[0128] At least one processor 601;

[0129] At least one memory 602 for storing at least one program;

[0130] When at least one program is executed by at least one processor 601, at least one processor 601 implements the control method of the air conditioner in the foregoing embodiments.

[0131] Similarly, the content in the above method embodiments is applicable to the device embodiments of the present invention. The functions specifically implemented by the device embodiments of the present invention are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those in the above method embodiments.

[0132] An embodiment of the present invention further provides an air conditioner, including Figure 5 as shown or Figure 6 the control device of the air conditioner as shown.

[0133] Similarly, the content in the above method embodiments is applicable to the air conditioner embodiments of the present invention. The functions specifically implemented by the air conditioner embodiments of the present invention are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those in the above method embodiments.

[0134] An embodiment of the present invention further provides a storage medium storing a program, which is used to implement the control method in the foregoing embodiments when executed by a processor.

[0135] The content in the above method embodiments is applicable to the storage medium embodiments of the present invention. The functions specifically implemented by the storage medium embodiments of the present invention are the same as those in the above method embodiments.

[0136] Similarly, the content in the above method embodiments is applicable to this storage medium embodiment. The functions specifically implemented in this storage medium embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those in the above method embodiments.

[0137] In some alternative embodiments, the functions / operations mentioned in the block diagrams may not occur in the order mentioned in the operation diagrams. For example, depending on the functions / operations involved, two consecutive blocks shown may actually be executed substantially simultaneously or the blocks can sometimes be executed in the reverse order. Additionally, the embodiments presented and described in the flowcharts of the present invention are provided by way of example for the purpose of providing a more comprehensive understanding of the technology. The disclosed methods are not limited to the operations and logical flows presented herein. Alternative embodiments are contemplated where the order of various operations is changed and where sub-operations described as part of a larger operation are executed independently.

[0138] Furthermore, although the present invention has been described in the context of functional modules, it should be understood that unless otherwise stated to the contrary, one or more of the functions and / or features may be integrated in a single physical device and / or software module, or one or more functions and / or features may be implemented in separate physical devices or software modules. It can also be understood that a detailed discussion of the actual implementation of each module is not necessary for understanding the present invention. Rather, given the attributes, functions, and internal relationships of the various functional modules in the devices disclosed herein, the actual implementation of the modules will be understood within the ordinary skills of an engineer. Thus, those skilled in the art can implement the present invention as set forth in the claims without undue experimentation. It can also be understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present invention, which is determined by the full scope of the appended claims and their equivalents.

[0139] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in the various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0140] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definable sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in conjunction with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0141] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection part with one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, a computer-readable medium can even be paper or other suitable media on which a program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other suitable processing as necessary, and then stored in a computer memory.

[0142] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits with suitable combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0143] In the above description of this specification, the descriptions referring to the terms "one embodiment / Example", "another embodiment / Example", or "certain embodiments / Examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example 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 a suitable manner in any one or more embodiments or examples.

[0144] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

[0145] In the above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent substitutions on some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method for an air conditioner, characterized in that, Including: Obtain the operating parameters and operating status of the air conditioner. Among them, the operating parameters include indoor temperature, indoor fan speed, outdoor temperature, and outdoor fan speed, and the operating status includes cooling or heating. Select the corresponding oil return condition according to the operating parameters and operating status. Among them, the oil return condition refers to the conditions that need to be met for the operation of the oil return mode. Obtain the compressor operating frequency. If the compressor operating frequency meets the oil return condition, then operate the oil return mode. Among them, the oil return mode includes a cooling oil return mode and a heating oil return mode. The cooling oil return mode means that the indoor fan is turned off during the oil return process to make the mixture of refrigerant and lubricating oil flow back to the compressor. The heating oil return mode means that the outdoor fan is turned off during the oil return process to make the mixture of refrigerant and lubricating oil flow back to the compressor. A connecting pipe is provided between the outdoor heat exchanger of the air conditioner and the compressor. The refrigerant and lubricating oil flow back to the compressor through the connecting pipe in the oil return mode. The operation of the oil return mode specifically includes: If the operating status of the air conditioner is cooling, turn off the indoor fan, control the compressor to operate at a preset oil return frequency for a preset oil return time, so that the mixture of refrigerant and lubricating oil does not flow through the indoor heat exchanger of the air conditioner and flows back to the compressor. If the operating status of the air conditioner is heating, turn off the outdoor fan, control the compressor to operate at a preset oil return frequency for a preset oil return time, so that the mixture of refrigerant and lubricating oil does not flow through the outdoor heat exchanger of the air conditioner and flows back to the compressor. The control method further includes: counting the number of times the cooling oil return mode is operated for the air conditioner; if the number of times of the cooling oil return mode is greater than the first preset number threshold, then after the operation of the cooling oil return mode ends, operate the heating oil return mode; or, counting the number of times the heating oil return mode is operated for the air conditioner, if the number of times of the heating oil return mode is greater than the second preset number threshold, then after the operation of the heating oil return mode ends, operate the cooling oil return mode.

2. The control method of an air conditioner according to claim 1, wherein, Before obtaining the operating parameters and operating status of the air conditioner, the control method further includes: Obtain the total power of the power supply and the total power of the electrical appliances. If the total power of the power supply is less than the total power of the electrical appliances, then determine the frequency of the compressor as the limit frequency.

3. The control method of an air conditioner according to claim 1, characterized in that The obtaining of the compressor operating frequency, if the compressor operating frequency meets the oil return condition, then operating the oil return mode specifically includes: Obtain the compressor operating frequency. If the compressor operating frequency is lower than the first frequency threshold included in the oil return condition, obtain the duration for which the compressor operating frequency is lower than the first frequency threshold. If the duration is greater than the first preset time threshold included in the oil return condition, then operate the oil return mode.

4. The control method of an air conditioner according to claim 1, wherein, After controlling the compressor to operate at a preset oil return frequency for a preset oil return time, the control method further includes: If the operating status of the air conditioner is cooling, turn off the oil return mode, turn on the indoor fan, and control the mixture of refrigerant and lubricating oil to flow back to the compressor through the indoor heat exchanger. If the operating state of the air conditioner is heating, turn off the oil return mode, turn on the outdoor fan, and control the mixture of refrigerant and lubricating oil to flow back to the compressor through the outdoor heat exchanger.

5. The control method of an air conditioner according to claim 1, characterized in that, The operating oil return mode includes: Obtain the current power of the air conditioner during operation; If the current power is less than the power of the air conditioner before operating the oil return mode, increase the operating frequency of the compressor until the current power is equal to the power of the air conditioner before operating the oil return mode.

6. The control method of an air conditioner according to claim 1, characterized in that, The control method further includes: If the operating frequency of the compressor is greater than the second frequency threshold included in the oil return condition, and the duration for which the operating frequency of the compressor is greater than the second frequency threshold included in the oil return condition is greater than the second preset time threshold, then clear and re - count the number of times of the refrigeration oil return mode and the heating oil return mode.

7. A control device for an air conditioner, characterized in that, It includes: An acquisition module, configured to acquire the operating parameters and operating state of the air conditioner, where the operating parameters include indoor temperature, indoor fan speed, outdoor temperature, and outdoor fan speed, and the operating state includes refrigeration or heating; A selection module, configured to select a corresponding oil return condition according to the operating parameters and operating state, where the oil return condition refers to the conditions required for operating the oil return mode; An operation module, configured to acquire the operating frequency of the compressor. If the operating frequency of the compressor meets the oil return condition, operate the oil return mode, where the oil return mode includes a refrigeration oil return mode and a heating oil return mode; the refrigeration oil return mode means turning off the indoor fan during the oil return process to make the mixture of refrigerant and lubricating oil flow back to the compressor; the heating oil return mode means turning off the outdoor fan during the oil return process to make the mixture of refrigerant and lubricating oil flow back to the compressor; a connecting pipe is provided between the outdoor heat exchanger and the compressor of the air conditioner, and the refrigerant and lubricating oil flow back to the compressor through the connecting pipe in the oil return mode; the operating oil return mode specifically includes: if the operating state of the air conditioner is refrigeration, turn off the indoor fan, control the compressor to operate at a preset oil return frequency for a preset oil return time, so that the mixture of refrigerant and lubricating oil does not flow through the indoor heat exchanger of the air conditioner and flows back to the compressor; if the operating state of the air conditioner is heating, turn off the outdoor fan, control the compressor to operate at a preset oil return frequency for a preset oil return time, so that the mixture of refrigerant and lubricating oil does not flow through the outdoor heat exchanger of the air conditioner and flows back to the compressor; The control device of the air conditioner further includes a counting module, which is configured to count the number of times the air conditioner operates the refrigeration oil return mode; if the number of times of the refrigeration oil return mode is greater than the first preset number threshold, then after the operation of the refrigeration oil return mode ends, operate the heating oil return mode; or, count the number of times the air conditioner operates the heating oil return mode, and if the number of times of the heating oil return mode is greater than the second preset number threshold, then after the operation of the heating oil return mode ends, operate the refrigeration oil return mode.

8. A control device for an air conditioner, characterized in that, It includes: At least one processor; At least one memory for storing at least one program; When at least one of the at least one program is executed by at least one of the at least one processor, the method according to any one of claims 1-6 is implemented.

9. An air conditioner, characterized in that, Comprising a control device according to claim 7 or 8.

10. A storage medium, characterized in that, The storage medium stores a processor-executable program, and when the processor-executable program is executed by a processor, it is used to implement the control method of the air conditioner according to any one of claims 1-6.

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