Method, device, air conditioner and storage medium for controlling an air conditioner

Abstract

The present application relates to the technical field of air conditioners, and discloses a method for controlling an air conditioner, including: obtaining the bottom temperature of a compressor at preset time intervals when the compressor is powered on; controlling the compressor to operate at a first set frequency and adjusting the opening degree of an expansion valve to a first set opening degree when the bottom temperature of the compressor obtained for the first time is less than a first set temperature; obtaining a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment, and using the frequency correction value to correct the operating frequency of the compressor; obtaining an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference, and using the opening degree correction value to correct the opening degree of the expansion valve. In this way, during the startup process of the compressor, the lubricating oil leaving the compressor with the refrigerant can be reduced. The present application also discloses a device for controlling an air conditioner, an air conditioner and a storage medium.

Description

Technical Field

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

[0002] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas and is the heart of a refrigeration system. It sucks in refrigerant gas at low temperature and low pressure from the suction pipe, compresses it by driving a piston through the operation of an electric motor, and then discharges the high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle. With the continuous progress of compressor and air-conditioning system technologies, higher requirements are placed on the quality and technology of compressors. Inside the compressor, lubricating oil for lubrication is generally injected to reduce the friction between internal components of the compressor, make the movement between each component smoother, and reduce the wear of components. Among them, the lubricating oil in the compressor will leave the compressor as the compressor operates, and then flow back into the oil sump at the bottom of the compressor through the oil return pipeline again.

[0003] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0004] Since the compressor in the related art usually starts at a target frequency, when the temperature at the bottom of the compressor is relatively low, a large amount of lubricating oil in the compressor may leave the compressor along with the refrigerant. At the same time, since it takes a certain amount of time for the lubricating oil to return to the compressor through the oil return pipeline again, that is, the lubricating oil taken out of the compressor cannot return to the compressor in time. This leads to a situation of lack or shortage of lubricating oil in the compressor, thereby exacerbating the wear of compressor components and mechanisms. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor is it intended to identify key / important elements or delineate the protection scope of these embodiments, but rather serves as a preface to the detailed description that follows.

[0006] The embodiments of the present disclosure provide a method, a device, an air conditioner, and a storage medium for controlling an air conditioner, so as to reduce the lubricating oil leaving the compressor along with the refrigerant during the startup process of the compressor.

[0007] In some embodiments, a compressor and an expansion valve are provided in an air conditioner. The method for controlling the air conditioner includes: when the compressor is powered on, obtaining the bottom temperature of the compressor at intervals of a preset time period; determining whether the first obtained bottom temperature of the compressor is less than a first set temperature; when the first obtained bottom temperature of the compressor is less than the first set temperature, controlling the compressor to operate at a first set frequency and adjusting the opening degree of the expansion valve to a first set opening degree; obtaining the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment; obtaining a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference, and using the frequency correction value to correct the operating frequency of the compressor so that the corrected operating frequency is equal to a preset target frequency; obtaining an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference, and using the opening degree correction value to correct the opening degree of the expansion valve so that the corrected opening degree is equal to a preset target opening degree.

[0008] In some embodiments, obtaining the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment includes: subtracting the bottom temperature at the previous moment from the bottom temperature at the current moment to obtain the temperature difference.

[0009] In some embodiments, obtaining a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference includes: when the temperature difference is greater than or equal to a second set temperature, obtaining a second set frequency for increasing the operating frequency of the compressor.

[0010] In some embodiments, obtaining a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference includes: when the temperature difference is less than the second set temperature, obtaining a third set frequency for increasing the operating frequency of the compressor.

[0011] In some embodiments, obtaining an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference includes: when the temperature difference is greater than or equal to a second set temperature, obtaining a second set opening degree for increasing the opening degree of the expansion valve.

[0012] In some embodiments, obtaining an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference includes: when the temperature difference is less than the second set temperature, obtaining a third set opening degree for increasing the opening degree of the expansion valve.

[0013] In some embodiments, after determining whether the first obtained bottom temperature of the compressor is less than the first set temperature, it further includes: when the first obtained bottom temperature of the compressor is not less than the first set temperature, controlling the compressor to operate at the target frequency and adjusting the opening degree of the expansion valve to the target opening degree.

[0014] In some embodiments, a compressor and an expansion valve are provided inside an air conditioner. The device for controlling the air conditioner includes: a first acquisition module configured to acquire the bottom temperature of the compressor at preset time intervals when the compressor is powered on; a determination module configured to determine whether the bottom temperature of the compressor acquired for the first time is less than a first set temperature; a control module configured to, when the bottom temperature of the compressor acquired for the first time is less than the first set temperature, control the compressor to operate at a first set frequency and adjust the opening degree of the expansion valve to a first set opening degree; a second acquisition module configured to acquire the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment; a first correction module configured to obtain a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference, and use the frequency correction value to correct the operating frequency of the compressor so that the corrected operating frequency is equal to a preset target frequency; a second correction module configured to obtain an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference, and use the opening degree correction value to correct the opening degree of the expansion valve so that the corrected opening degree is equal to a preset target opening degree.

[0015] In some embodiments, the device for controlling the air conditioner includes a processor and a memory storing program instructions. The processor is configured to execute the above method for controlling the air conditioner when running the program instructions.

[0016] In some embodiments, the air conditioner includes the above device for controlling the air conditioner.

[0017] In some embodiments, the storage medium stores program instructions, and the program instructions execute the above method for controlling the air conditioner when running.

[0018] The method, device, air conditioner, and storage medium for controlling an air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects: By controlling the compressor to start at a first set frequency and adjusting the opening degree of the expansion valve to a first set opening degree when the bottom temperature of the compressor acquired for the first time is less than the first set temperature. This enables the compressor to start at a relatively low frequency, and at the same time makes the refrigerant flow rate a relatively small flow rate when the compressor starts. Therefore, during the start-up process of the compressor, the lubricating oil leaving the compressor with the refrigerant can be reduced.

[0019] The above general description and the following description are only exemplary and explanatory, and are not used to limit this application. Description of the Drawings

[0020] One or more embodiments are exemplarily illustrated by corresponding accompanying drawings. These exemplary illustrations and the accompanying drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the accompanying drawings are shown as similar elements. The accompanying drawings do not constitute a scale limitation, and wherein:

[0021] Figure 1 is a schematic diagram of a method for controlling an air conditioner provided by an embodiment of the present disclosure;

[0022] Figure 2 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

[0023] Figure 3 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

[0024] Figure 4 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

[0025] Figure 5 is a schematic diagram of a device for controlling an air conditioner provided by an embodiment of the present disclosure;

[0026] Figure 6 is a schematic diagram of another device for controlling an air conditioner provided by an embodiment of the present disclosure. Detailed implementation manners

[0027] In order to be able to more fully understand the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner.

[0028] The terms "first", "second", etc. in the description and claims of the embodiments of the present disclosure and the above accompanying drawings are used to distinguish similar objects and do not have to be used to describe a specific order or sequence. It should be understood that such data may be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0029] In the compressor in the related art, in order to quickly establish oil return balance, that is, to make the amount of lubricating oil leaving the compressor equal to the amount of lubricating oil returning to the compressor via the oil return pipeline. It usually starts at the target frequency, and the opening degree of the expansion valve for adjusting the refrigerant flow rate is adjusted to the target opening degree when the compressor starts. However, when the temperature at the bottom of the compressor is relatively low, that is, when the temperature at the bottom of the compressor is less than the first set temperature, since the refrigerant is dissolved in the lubricating oil, a large amount of lubricating oil may leave the compressor along with the refrigerant when the refrigerant leaves the compressor. At the same time, since it takes a certain amount of time for the lubricating oil to return to the compressor via the oil return pipeline again, it will lead to a lack or shortage of lubricating oil in the compressor. In this application, when the temperature at the bottom of the compressor obtained for the first time is less than the first set temperature, the compressor is controlled to start at the first set frequency, and the opening degree of the expansion valve is adjusted to the first set opening degree. In this way, the compressor can start at a relatively low frequency, and at the same time, the refrigerant flow rate is a relatively small flow rate when the compressor starts, so that the lubricating oil leaving the compressor can be reduced. At the same time, since the dissolution amount of the refrigerant in the lubricating oil decreases as the temperature at the bottom of the compressor increases. Therefore, by gradually increasing the operating frequency of the compressor to the target frequency and gradually increasing the opening degree of the expansion valve to the target opening degree according to the temperature difference, it is possible to make the amount of lubricating oil leaving the compressor quickly equal to the amount of lubricating oil returning to the compressor via the oil return pipeline, that is, to quickly establish oil return balance while reducing the lubricating oil leaving the compressor with the refrigerant.

[0030] Combined with Figure 1 As shown, an embodiment of the present disclosure provides a method for controlling an air conditioner. A compressor and an expansion valve are provided in the air conditioner, wherein the expansion valve is used to adjust the flow rate of the refrigerant; the method includes:

[0031] Step S101, when the air conditioner is powered on for the compressor, obtain the bottom temperature of the compressor at intervals of a preset time period.

[0032] Step S102, the air conditioner determines whether the bottom temperature of the compressor obtained for the first time is less than the first set temperature.

[0033] Step S103, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, the air conditioner controls the compressor to operate at the first set frequency and adjusts the opening degree of the expansion valve to the first set opening degree.

[0034] Step S104, the air conditioner obtains the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment.

[0035] Step S105, the air conditioner obtains a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference, and uses the frequency correction value to correct the operating frequency of the compressor so that the corrected operating frequency is equal to the preset target frequency.

[0036] Step S106: The air conditioner obtains an opening correction value for increasing the opening of the expansion valve according to the temperature difference, and uses the opening correction value to correct the opening of the expansion valve so that the corrected opening is equal to a preset target opening.

[0037] By using the method for controlling an air conditioner provided in the embodiment of the present disclosure, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, the compressor is first controlled to operate at the first set frequency, that is, the compressor is first controlled to start at a relatively low frequency, which can reduce the lubricating oil that leaves the compressor along with the refrigerant. At the same time, by controlling the operating frequency of the compressor to gradually increase to the target frequency according to the temperature difference, it is possible to make the lubricating oil that leaves the compressor quickly reach the same state as the lubricating oil that returns to the compressor via the oil return pipeline while reducing the lubricating oil that leaves the compressor along with the refrigerant. In addition, since the expansion valve is used to regulate the flow rate of the refrigerant. Therefore, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, by adjusting the opening of the expansion valve to the first set opening, that is, first adjusting the refrigerant flow rate to a relatively small flow rate, it is possible to further reduce the lubricating oil that leaves the compressor along with the refrigerant. And since the amount of refrigerant dissolved in the lubricating oil decreases as the temperature increases, and at the same time, during the operation of the compressor, the bottom temperature of the compressor gradually increases. Therefore, by gradually increasing the opening of the expansion valve according to the temperature difference, it is possible to increase the flow rate of the refrigerant while reducing the lubricating oil that leaves the compressor along with the refrigerant.

[0038] Wherein, the previous moment is the most recent moment when the bottom temperature of the compressor is obtained, and a preset time period is set between the previous moment and the current moment.

[0039] Optionally, the first set temperature is the critical temperature at which the refrigerant dissolves in the lubricating oil. That is, when the bottom temperature of the compressor is less than the first set temperature, the refrigerant dissolves in the lubricating oil. In order to avoid unnecessary start-up procedures, by determining whether the bottom temperature of the compressor obtained for the first time is less than the first set temperature, it is possible to determine whether the compressor needs to start at the first set frequency, and whether the opening of the expansion valve needs to be adjusted to the first set opening during the start-up process of the compressor. In some embodiments, the first set frequency is 30 Hz, the first set opening is 120 pulses, and the first set temperature is 35 °C.

[0040] Optionally, obtaining the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment includes: subtracting the bottom temperature at the previous moment from the bottom temperature at the current moment to obtain the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment. In the case where there is no lack of oil or less oil in the compressor, the bottom temperature of the compressor will slowly increase due to the operation of the compressor. However, in the case where there is a lack of oil or less oil in the compressor, the components inside the compressor will rub against each other to generate heat, which will in turn cause a sharp increase in the bottom temperature of the compressor. Therefore, by obtaining the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment, it is possible to determine whether there is a lack of lubricating oil in the compressor. In some embodiments, the preset interval time period is 30 seconds.

[0041] Combined with Figure 2 As shown, an embodiment of the present disclosure provides a method for controlling an air conditioner. An air conditioner is provided with a compressor and an expansion valve, wherein the expansion valve is used to adjust the flow rate of the refrigerant; the method includes:

[0042] Step S201, when the compressor of the air conditioner is powered on, obtain the bottom temperature of the compressor at preset intervals.

[0043] Step S202, the air conditioner determines whether the bottom temperature of the compressor obtained for the first time is less than the first set temperature.

[0044] Step S203, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, the air conditioner controls the compressor to operate at the first set frequency and adjusts the opening degree of the expansion valve to the first set opening degree.

[0045] Step S204, the air conditioner subtracts the bottom temperature at the previous moment from the bottom temperature at the current moment to obtain the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment.

[0046] Step S205, the air conditioner obtains a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference, and uses the frequency correction value to correct the operating frequency of the compressor so that the corrected operating frequency is equal to the preset target frequency.

[0047] Step S206, the air conditioner obtains an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference, and uses the opening degree correction value to correct the opening degree of the expansion valve so that the corrected opening degree is equal to the preset target opening degree.

[0048] By using the method for controlling an air conditioner provided in the embodiments of the present disclosure, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, the compressor is first controlled to operate at the first set frequency, that is, the compressor is first controlled to start at a relatively low frequency, so as to reduce the lubricating oil leaving the compressor along with the refrigerant. At the same time, by controlling the operating frequency of the compressor to gradually increase to the target frequency according to the temperature difference, it is possible to make the lubricating oil leaving the compressor quickly reach the same state as the lubricating oil returning to the compressor via the oil return pipeline while reducing the lubricating oil leaving the compressor along with the refrigerant. Furthermore, it is possible to ensure that there is sufficient lubricating oil in the compressor. In addition, since the expansion valve is used to adjust the flow rate of the refrigerant, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, the opening degree of the expansion valve is adjusted to the first set opening degree, that is, the refrigerant flow rate is first adjusted to a relatively low flow rate, so as to further reduce the lubricating oil leaving the compressor along with the refrigerant. And since the solubility of the refrigerant in the lubricating oil decreases as the temperature increases, and at the same time, during the operation of the compressor, the bottom temperature of the compressor gradually increases. Therefore, by gradually increasing the opening degree of the expansion valve according to the temperature difference, it is possible to increase the flow rate of the refrigerant while reducing the lubricating oil leaving the compressor along with the refrigerant.

[0049] Optionally, obtaining a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference includes: when the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment is greater than or equal to the second set temperature, obtaining the second set frequency for increasing the operating frequency of the compressor. Since when there is no lack or shortage of lubricating oil in the compressor, the bottom temperature of the compressor will slowly increase as the operating frequency of the compressor increases. However, when there is a lack or shortage of lubricating oil in the compressor, the components in the compressor will rub against each other to generate heat, which will in turn cause a sharp increase in the bottom temperature of the compressor. Therefore, by obtaining the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment, it is possible to determine whether there is a lack of lubricating oil in the compressor. And it is possible to correct the operating frequency of the compressor when it is determined that there is a lack of lubricating oil in the compressor.

[0050] Optionally, obtaining a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference includes: when the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment is less than the second set temperature, obtaining a third set frequency for increasing the operating frequency of the compressor. Since in the case where there is no lack of oil or insufficient oil in the compressor, the bottom temperature of the compressor will slowly increase as the operating frequency of the compressor increases. However, in the case where there is insufficient oil or lack of oil in the compressor, the components inside the compressor will rub against each other to generate heat, which will in turn cause a sharp increase in the bottom temperature of the compressor. Therefore, by obtaining the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment, it is possible to determine whether there is a lack of lubricating oil in the compressor. And when the temperature difference is less than the second set temperature, it can be determined that there is no lack of lubricating oil in the compressor. Therefore, the operating frequency of the compressor is corrected using the third set frequency, so that the operating frequency of the compressor can reach the target frequency more quickly. That is, the amount of lubricating oil leaving the compressor can quickly equal the amount of lubricating oil returning to the compressor via the oil return pipeline.

[0051] Optionally, the second set frequency is less than the third set frequency. In some embodiments, the second set frequency is equal to 5 Hz, and the third set frequency is 10 Hz. The second set temperature is 5 °C. In this way, when the temperature difference is greater than or equal to the second set temperature, the operating frequency of the compressor is corrected using the second set frequency. That is, the operating frequency of the compressor is increased by a small margin, so that the lubricating oil leaving the compressor slowly increases, leaving sufficient time for the lubricating oil to return to the compressor again. In addition, when the temperature difference is less than the second set temperature, it can be determined that there is no lack of lubricating oil in the compressor, and the temperature difference is caused by the normal operation of the compressor. Therefore, the operating frequency of the compressor is corrected using the third set frequency, so that the operating frequency of the compressor can reach the target frequency quickly.

[0052] Optionally, obtaining an opening correction value for increasing the opening of the expansion valve according to the temperature difference includes: when the temperature difference is greater than or equal to the second set temperature, obtaining a second set opening for increasing the opening of the expansion valve. Since the amount of refrigerant dissolved in the lubricating oil decreases as the temperature increases, and at the same time, during the operation of the compressor, the bottom temperature of the compressor gradually increases. Therefore, when the temperature difference is greater than or equal to the second set temperature, the opening of the expansion valve is corrected using the second set opening. Thus, it is possible to increase the refrigerant flow rate while reducing the lubricating oil leaving the compressor with the refrigerant.

[0053] Optionally, obtaining an opening correction value for increasing the opening of the expansion valve according to the temperature difference includes: when the temperature difference is less than the second set temperature, obtaining a third set opening for increasing the opening of the expansion valve. Since the dissolved amount of the refrigerant in the lubricating oil decreases as the temperature increases, and at the same time, during the operation of the compressor, the bottom temperature of the compressor gradually increases. Therefore, by correcting the opening of the expansion valve with the third set opening when the temperature difference is less than the second set temperature, the flow rate of the refrigerant can be increased while reducing the lubricating oil leaving the compressor with the refrigerant.

[0054] Combined with Figure 3 As shown, an embodiment of the present disclosure provides a method for controlling an air conditioner, including:

[0055] Step S301, when the air conditioner is powered on for the compressor, obtain the bottom temperature of the compressor at intervals of a preset time period.

[0056] Step S302, the air conditioner determines whether the bottom temperature of the compressor obtained for the first time is less than the first set temperature.

[0057] Step S303, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, control the compressor to operate at the first set frequency and adjust the opening of the expansion valve to the first set opening.

[0058] Step S304, the air conditioner subtracts the bottom temperature of the previous moment from the bottom temperature of the current moment to obtain the temperature difference between the bottom temperature of the previous moment and the bottom temperature of the current moment.

[0059] Step S305, the air conditioner determines whether the temperature difference is less than the second set temperature. If so, execute Step S306; otherwise, execute Step S307.

[0060] Step S306, the air conditioner obtains a third set frequency for increasing the operating frequency of the compressor, and corrects the operating frequency of the compressor with the third set frequency. The air conditioner obtains a third set opening for increasing the opening of the expansion valve, and corrects the opening of the expansion valve with the third set opening. Then execute Step S308.

[0061] Step S307, the air conditioner obtains a second set frequency for increasing the operating frequency of the compressor, and corrects the operating frequency of the compressor with the second set frequency; the air conditioner obtains a second set opening for increasing the opening of the expansion valve, and corrects the opening of the expansion valve with the second set opening. Then execute Step S308.

[0062] Step S308, the air conditioner determines whether the corrected operating frequency is greater than or equal to a preset target frequency, and determines whether the corrected opening degree is greater than or equal to a preset target opening degree. In the case where the corrected operating frequency is greater than or equal to the preset target frequency and the corrected opening degree is greater than or equal to the preset target opening degree, the operation ends. In the case where the corrected operating frequency is less than the preset target frequency and / or the corrected opening degree is less than the preset target opening degree, step S304 is executed.

[0063] Using the method for controlling an air conditioner provided by the embodiment of the present disclosure, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, the compressor is first controlled to operate at the first set frequency, that is, the compressor is first controlled to start at a relatively low frequency, so that the lubricating oil leaving the compressor with the refrigerant can be reduced. At the same time, by controlling the operating frequency of the compressor to gradually increase to the target frequency according to the temperature difference, the lubricating oil leaving the compressor can quickly reach the same state as the lubricating oil returning to the compressor via the oil return pipeline while reducing the lubricating oil leaving the compressor with the refrigerant. Furthermore, it can ensure that there is enough lubricating oil in the compressor. In addition, since the expansion valve is used to adjust the refrigerant flow rate, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, the opening degree of the expansion valve is adjusted to the first set opening degree, that is, the refrigerant flow rate is first adjusted to a relatively small flow rate, so that the lubricating oil leaving the compressor with the refrigerant can be further reduced.

[0064] Optionally, after correcting the operating frequency of the compressor using the frequency correction value, it further includes: when the corrected operating frequency is greater than the target frequency, controlling the compressor to operate at the target frequency.

[0065] Optionally, after correcting the opening degree of the expansion valve using the opening degree correction value, it further includes: when the corrected opening degree is greater than the target opening degree, adjusting the opening degree of the expansion valve to the target opening degree.

[0066] Optionally, after determining whether the bottom temperature of the compressor obtained for the first time is less than the first set temperature, it further includes: when the bottom temperature of the compressor obtained for the first time is not less than the first set temperature, controlling the compressor to operate at the target frequency and adjusting the opening degree of the expansion valve to the target opening degree.

[0067] Combined Figure 4 As shown, the embodiment of the present disclosure provides a method for controlling an air conditioner, including:

[0068] Step S401, when the compressor is powered on, the air conditioner obtains the bottom temperature of the compressor at intervals of a preset time period.

[0069] Step S402, the air conditioner determines whether the bottom temperature of the compressor obtained for the first time is less than the first set temperature. If so, step S403 is executed; otherwise, step S407 is executed.

[0070] Step S403, the air conditioner controls the compressor to operate at the first set frequency and adjusts the opening degree of the expansion valve to the first set opening degree. Then step S404 is executed.

[0071] Step S404, the air conditioner obtains the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment. Then step S405 is executed.

[0072] Step S405, the air conditioner obtains a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference, and uses the frequency correction value to correct the operating frequency of the compressor so that the corrected operating frequency is equal to the preset target frequency. Then step S406 is executed.

[0073] Step S406, the air conditioner obtains an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference, and uses the opening degree correction value to correct the opening degree of the expansion valve so that the corrected opening degree is equal to the preset target opening degree.

[0074] Step S407, the air conditioner controls the compressor to operate at the target frequency and adjusts the opening degree of the expansion valve to the target opening degree.

[0075] By using the method for controlling an air conditioner provided in the embodiment of the present disclosure, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, the compressor is first controlled to operate at the first set frequency, that is, the compressor is first controlled to start at a relatively low frequency, so that the lubricating oil leaving the compressor with the refrigerant can be reduced. At the same time, by controlling the operating frequency of the compressor to gradually increase to the target frequency according to the temperature difference, the lubricating oil leaving the compressor can quickly reach the same state as the lubricating oil returning to the compressor via the oil return pipeline while reducing the lubricating oil leaving the compressor with the refrigerant. Furthermore, it can ensure that there is enough lubricating oil in the compressor. In addition, since the expansion valve is used to adjust the refrigerant flow rate, when the bottom temperature of the compressor obtained for the first time is less than the first set temperature, the opening degree of the expansion valve is adjusted to the first set opening degree, that is, the refrigerant flow rate is first adjusted to a relatively small flow rate, so that the lubricating oil leaving the compressor with the refrigerant can be further reduced. And since the solubility of the refrigerant in the lubricating oil decreases with the increase of temperature, and at the same time, during the operation of the compressor, the bottom temperature of the compressor will gradually increase. Therefore, by gradually increasing the opening degree of the expansion valve according to the temperature difference, the refrigerant flow rate can be increased while reducing the lubricating oil leaving the compressor with the refrigerant.

[0076] In some embodiments, when the compressor is powered on, the bottom temperature of the compressor obtained for the first time is 5 degrees Celsius. It is determined that the bottom temperature "5 degrees Celsius" obtained for the first time is less than the first set temperature "35 degrees Celsius". The compressor is controlled to operate at the first set frequency "30 Hz", and the opening degree of the expansion valve is adjusted to the first set opening degree "120 pulses". After a preset time period "30 seconds", the bottom temperature of the compressor "8 degrees Celsius" is obtained for the second time. The temperature difference "3 degrees Celsius" between the bottom temperature "8 degrees Celsius" at the current moment and the bottom temperature "5 degrees Celsius" at the previous moment is obtained. It is determined that the temperature difference "3 degrees Celsius" is less than the second set temperature "5 degrees Celsius". The third set frequency "8 Hz" for increasing the operating frequency of the compressor is obtained, and the third set opening degree "10 pulses" for increasing the opening degree of the expansion valve is obtained. The operating frequency "30 Hz" of the compressor is corrected using the third set frequency "8 Hz", and the operating frequency of the compressor is corrected to "38 Hz"; and the opening degree of the expansion valve is corrected using the third set opening degree "10 pulses", and the opening degree of the expansion valve is corrected to "130 pulses". Then, when the opening degree of the expansion valve is adjusted to "130 pulses" and the compressor operates at "38 Hz" for a preset time period "30 seconds", the bottom temperature of the compressor "16 degrees Celsius" is obtained for the third time. The temperature difference "8 degrees Celsius" between the bottom temperature "16 degrees Celsius" at the current moment and the bottom temperature "8 degrees Celsius" at the previous moment is obtained. It is determined that the temperature difference "8 degrees Celsius" is greater than the second set temperature "5 degrees Celsius". The second set frequency "5 Hz" for increasing the operating frequency of the compressor is obtained, and the second set opening degree "5 pulses" for increasing the opening degree of the expansion valve is obtained. Then, the operating frequency "38 Hz" of the compressor is corrected using the second set frequency "5 Hz", and the operating frequency of the compressor is corrected to "43 Hz"; and the opening degree "130 pulses" of the expansion valve is corrected using the second set opening degree "5 pulses", and the opening degree of the expansion valve is corrected to "135 pulses". Then, when the opening degree of the expansion valve is adjusted to "135 pulses" and the compressor operates at "43 Hz" for a preset time period "30 seconds", the bottom temperature of the compressor is obtained for the fourth time, and the temperature difference between the bottom temperature at the current moment and the bottom temperature at the previous moment is obtained again. Then, according to the temperature difference, the frequency correction value for increasing the operating frequency of the compressor is obtained again, and the operating frequency of the compressor is corrected again using the frequency correction value until the corrected operating frequency is equal to the preset target frequency. At the same time, according to the temperature difference, the opening degree correction value for increasing the opening degree of the expansion valve is obtained again, and the opening degree of the expansion valve is corrected using the opening degree correction value until the corrected opening degree is equal to the preset target opening degree. In this way, by correcting the operating frequency of the compressor and the opening degree of the expansion valve multiple times, the operating frequency of the compressor is gradually increased from the first set frequency to the target frequency, and at the same time, the opening degree of the expansion valve is gradually increased from the first set opening degree to the target opening degree.Therefore, it is possible to reduce the lubricating oil leaving the compressor with the refrigerant, and make the amount of lubricating oil leaving the compressor quickly equal to the amount of lubricating oil returning to the compressor via the oil return pipeline, that is, it is possible to quickly establish an oil return balance.

[0077] Combined with Figure 5 As shown, the embodiment of the present disclosure provides a device for controlling an air conditioner. A compressor and an expansion valve are provided in the air conditioner. The device includes a first acquisition module 501, a determination module 502, a control module 503, a second acquisition module 504, a first correction module 505, and a second correction module 506. The first acquisition module 501 is configured to acquire the bottom temperature of the compressor at preset time intervals when the compressor is powered on. The determination module 502 is configured to determine whether the first acquired bottom temperature of the compressor is less than the first set temperature. The control module 503 is configured to control the compressor to operate at the first set frequency and adjust the opening degree of the expansion valve to the first set opening degree when the first acquired bottom temperature of the compressor is less than the first set temperature. The second acquisition module 504 is configured to acquire the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment. The first correction module 505 is configured to obtain a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference, and use the frequency correction value to correct the operating frequency of the compressor so that the corrected operating frequency is equal to the preset target frequency. The second correction module 506 is configured to obtain an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference, and use the opening degree correction value to correct the opening degree of the expansion valve so that the corrected opening degree is equal to the preset target opening degree.

[0078] By using the device for controlling an air conditioner provided by the embodiment of the present disclosure, when the first acquired bottom temperature of the compressor is less than the first set temperature, the compressor is first controlled to operate at the first set frequency, that is, the compressor is first controlled to start at a relatively small frequency, so that the lubricating oil leaving the compressor with the refrigerant can be reduced. At the same time, by controlling the operating frequency of the compressor to gradually increase to the target frequency according to the temperature difference, it is possible to make the lubricating oil leaving the compressor quickly reach the same state as the lubricating oil returning to the compressor via the oil return pipeline while reducing the lubricating oil leaving the compressor with the refrigerant. In addition, since the expansion valve is used to adjust the refrigerant flow rate, when the first acquired bottom temperature of the compressor is less than the first set temperature, by adjusting the opening degree of the expansion valve to the first set opening degree, that is, first adjusting the refrigerant flow rate to a relatively small flow rate, the lubricating oil leaving the compressor with the refrigerant can be further reduced. And since the dissolved amount of the refrigerant in the lubricating oil decreases with the increase of temperature, and at the same time, during the operation of the compressor, the bottom temperature of the compressor will gradually increase. Therefore, by gradually increasing the opening degree of the expansion valve according to the temperature difference, it is possible to increase the refrigerant flow rate while reducing the lubricating oil leaving the compressor with the refrigerant.

[0079] Optionally, the second acquisition module is configured to acquire the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment by: subtracting the bottom temperature at the previous moment from the bottom temperature at the current moment to obtain the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment.

[0080] Optionally, the first correction module is configured to obtain a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference by: when the temperature difference is greater than or equal to the second set temperature, obtaining a second set frequency for increasing the operating frequency of the compressor.

[0081] Optionally, the first correction module is configured to obtain a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference by: when the temperature difference is less than the second set temperature, obtaining a third set frequency for increasing the operating frequency of the compressor.

[0082] Optionally, the second correction module is configured to obtain an opening correction value for increasing the opening of the expansion valve according to the temperature difference by: when the temperature difference is greater than or equal to the second set temperature, obtaining a second set opening for increasing the opening of the expansion valve.

[0083] Optionally, the second correction module is configured to obtain an opening correction value for increasing the opening of the expansion valve according to the temperature difference by: when the temperature difference is less than the second set temperature, obtaining a third set opening for increasing the opening of the expansion valve.

[0084] Optionally, the control module is further configured to, when the bottom temperature of the compressor obtained for the first time is not less than the first set temperature, control the compressor to operate at a target frequency and adjust the opening of the expansion valve to a target opening.

[0085] Combined Figure 6 As shown in the figure, an embodiment of the present disclosure provides a device for controlling an air conditioner, including a processor 600 and a memory 601. Optionally, the device may further include a communication interface 602 and a bus 603. Among them, the processor 600, the communication interface 602, and the memory 601 can complete mutual communication through the bus 603. The communication interface 602 can be used for information transmission. The processor 600 can call the logical instructions in the memory 601 to execute the method for controlling the air conditioner in the above embodiment.

[0086] In addition, when the logical instructions in the above-mentioned memory 601 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0087] The memory 601, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 600 executes functional applications and data processing by running the program instructions / modules stored in the memory 601, that is, implements the method for controlling the air conditioner in the above embodiments.

[0088] The memory 601 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 601 may include high-speed random access memory and may also include non-volatile memory.

[0089] The embodiments of the present disclosure provide an air conditioner including the above device for controlling the air conditioner.

[0090] The embodiments of the present disclosure provide a storage medium storing program instructions, and when the program instructions are running, they execute the above method for controlling the air conditioner.

[0091] The embodiments of the present disclosure provide a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by a computer, the computer is made to execute the above method for controlling the air conditioner.

[0092] The above computer-readable storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0093] The technical solutions of the embodiments of the present disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The foregoing storage medium may be a non-transient storage medium, including: various media 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 disc that can store program codes, or may also be a transient storage medium.

[0094] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments only represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing embodiments and do not limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groupings of these. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, or apparatus that includes the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0095] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The technician can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The technician can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0096] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0097] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to the embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the blocks can occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. Each block in the block diagram and / or flowchart, as well as combinations of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling an air conditioner, characterized in that, An air conditioner is provided with a compressor and an expansion valve; the method includes: When the compressor is powered on, obtaining the bottom temperature of the compressor at intervals of a preset time period; Determining whether the bottom temperature of the compressor obtained for the first time is less than a first set temperature; the first set temperature is the critical temperature at which the refrigerant dissolves in the lubricating oil; When the bottom temperature of the compressor obtained for the first time is less than the first set temperature, controlling the compressor to operate at a first set frequency and adjusting the opening degree of the expansion valve to a first set opening degree; Obtaining the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment; Obtaining a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference, and using the frequency correction value to correct the operating frequency of the compressor so that the corrected operating frequency is equal to a preset target frequency; Obtaining an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference, and using the opening degree correction value to correct the opening degree of the expansion valve so that the corrected opening degree is equal to a preset target opening degree.

2. The method according to claim 1, characterized in that, Obtaining the temperature difference between the bottom temperature at the previous moment and the bottom temperature at the current moment includes: Subtracting the bottom temperature at the previous moment from the bottom temperature at the current moment to obtain the temperature difference.

3. The method according to claim 1, characterized in that, Obtaining a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference includes: When the temperature difference is greater than or equal to a second set temperature, obtaining a second set frequency for increasing the operating frequency of the compressor.

4. The method according to claim 1, wherein Obtaining a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference includes: When the temperature difference is less than the second set temperature, obtaining a third set frequency for increasing the operating frequency of the compressor.

5. The method according to claim 1, wherein Obtaining an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference includes: When the temperature difference is greater than or equal to a second set temperature, obtaining a second set opening degree for increasing the opening degree of the expansion valve.

6. The method according to claim 1, wherein Obtaining an opening degree correction value for increasing the opening degree of the expansion valve according to the temperature difference includes: When the temperature difference is less than the second set temperature, obtaining a third set opening degree for increasing the opening degree of the expansion valve.

7. The method according to any one of claims 1 to 6, characterized in that After determining whether the bottom temperature of the compressor obtained for the first time is less than the first set temperature, it further includes: When the bottom temperature of the compressor obtained for the first time is not less than the first set temperature, controlling the compressor to operate at the target frequency and adjusting the opening degree of the expansion valve to the target opening degree.

8. A device for controlling an air conditioner, characterized in that, An air conditioner is provided with a compressor and an expansion valve; the device includes: A first obtaining module configured to obtain the bottom temperature of the compressor at intervals of a preset time period when the compressor is powered on; A determining module configured to determine whether the bottom temperature of the compressor obtained for the first time is less than a first set temperature; the first set temperature is the critical temperature at which the refrigerant dissolves in the lubricating oil; A control module configured to control the compressor to operate at a first set frequency and adjust the opening degree of the expansion valve to a first set opening degree when the bottom temperature of the compressor obtained for the first time is less than the first set temperature; A second acquisition module, configured to acquire a temperature difference between the bottom temperature at a previous moment and the bottom temperature at the current moment; A first correction module, configured to obtain a frequency correction value for increasing the operating frequency of the compressor according to the temperature difference, and use the frequency correction value to correct the operating frequency of the compressor until the corrected operating frequency is equal to a preset target frequency; A second correction module, configured to obtain an opening correction value for increasing the opening of the expansion valve according to the temperature difference, and use the opening correction value to correct the opening of the expansion valve until the corrected opening is equal to a preset target opening.

9. A device for controlling an air conditioner, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the method for controlling an air conditioner according to any one of claims 1 to 7 when running the program instructions.

10. An air conditioner, characterized in that, Including the device for controlling an air conditioner according to claim 9.

11. A storage medium stores program instructions, characterized in that, When the program instructions are running, execute the method for controlling an air conditioner according to any one of claims 1 to 7.

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