An air conditioner, its control method, device and readable storage medium

Abstract

The present invention provides an air conditioner and its control method, device, and readable storage medium. The control method includes: when the air conditioner is turned on, obtaining the outer ring temperature, operating mode, the interval time between the power-on of the air conditioner and its startup, the first waiting time for the air conditioner to establish the discharge superheat degree, and the second waiting time for the air conditioner to establish the suction superheat degree; judging whether the air conditioner needs to execute an oil return scheme according to the outer ring temperature, operating mode, interval time, first waiting time, and second waiting time; wherein, the first waiting time is the time from the startup of the air conditioner to when the discharge superheat degree reaches the first preset temperature, and the second waiting time is the time from the startup of the air conditioner to when the suction superheat degree reaches the second preset temperature. The problem solved by the present invention is that the technical solutions in the related art cannot accurately judge whether the air conditioner system needs to return oil.

Description

Technical Field

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

[0002] When the air conditioner operates in low-temperature refrigeration, the oil sump temperature is low, the oil temperature superheat is low, the lubricating oil viscosity is high, and the oil discharge rate is low; under the normal use condition of the air conditioner, the compressor generally does not run out of oil. However, under low-temperature working conditions, when the air conditioner system is powered off and placed, the refrigerant is stored in the low-pressure side pipeline, the gas-liquid separator and the compressor in a liquid state. When the air conditioner system is powered on and the air conditioner is turned on, the compressor will suck in a large amount of liquid refrigerant. The lubricating oil in the compressor dissolves in the liquid refrigerant and is discharged from the compressor in large quantities as the refrigerant is discharged, resulting in oil shortage in the compressor; at the same time, from the analysis of the oil demand of the compressor, when the ambient temperature is relatively low, the system capacity demand is small, the compressor operating frequency is low, the high and low pressure difference is small, and it is relatively difficult for the crankshaft to bring the oil into the cylinder, and it is also relatively difficult to form an oil film. Therefore, low-frequency operation requires a higher oil level to directly immerse the cylinder in the oil sump; when refrigerating at low temperature, the compressor output is low, the refrigerant circulation is weak, and it is difficult for the lubricating oil outside the compressor to return to the compressor, and the situation of oil shortage after startup may not be improved for a long time, threatening the reliable operation of the compressor.

[0003] The prior art determines whether the air conditioner system needs to return oil according to relevant operating parameters of the air conditioner, but the control method for determining whether to return oil is not accurate enough to accurately identify whether the air conditioner system needs to return oil.

[0004] It can be seen that the problem in the related art is that the technical solution in the related art cannot accurately determine whether the air conditioner system needs to return oil. Summary of the Invention

[0005] The problem solved by the present invention is that the technical solution in the related art cannot accurately determine whether the air conditioner system needs to return oil.

[0006] To solve the above problems, the first object of the present invention is to provide a control method for returning oil to the compressor of an air conditioner.

[0007] The second object of the present invention is to provide a control device for an air conditioner.

[0008] The third object of the present invention is to provide an air conditioner.

[0009] The fourth object of the present invention is to provide a readable storage medium.

[0010] To achieve the first object of the present invention, an embodiment of the present invention provides a control method for returning oil to the compressor of an air conditioner, and the control method includes:

[0011] S100: When the air conditioner is turned on, obtain the outdoor temperature, operating mode, the interval time between the air conditioner being powered on and being turned on, the first waiting time for the air conditioner to establish the exhaust superheat degree, and the second waiting time for the air conditioner to establish the suction superheat degree;

[0012] S200: Determine whether the air conditioner needs to execute an oil return scheme according to the outdoor temperature, operating mode, interval time, first waiting time, and second waiting time;

[0013] Among them, the first waiting time is the time from when the air conditioner is turned on to when the exhaust superheat degree reaches the first preset temperature, and the second waiting time is the time from when the air conditioner is turned on to when the suction superheat degree reaches the second preset temperature.

[0014] Compared with the prior art, the technical effects achieved by adopting this technical solution: The solution of this embodiment can accurately determine the oil shortage situation of the air conditioner system, effectively improving the reliability of the control method of the present invention.

[0015] In an embodiment of the present invention, S200 includes:

[0016] S210: Determine whether the air conditioner meets the first condition according to the outdoor temperature and operating mode;

[0017] S220: Determine whether the air conditioner meets the second condition according to the interval time;

[0018] S230: Determine whether the air conditioner meets the third condition according to the first waiting time and the second waiting time;

[0019] S240: When the first condition, the second condition, and the third condition are all met, determine that the air conditioner needs to execute an oil return scheme.

[0020] Compared with the prior art, the technical effects achieved by adopting this technical solution: In this embodiment, different judgment conditions are executed for different parameter data, further improving the accuracy of the method of the present invention in judging the oil shortage situation of the air conditioner system.

[0021] In an embodiment of the present invention, S210 includes:

[0022] S211: Compare the outdoor temperature with the first temperature threshold;

[0023] S212: When the outdoor temperature is less than or equal to the first temperature threshold and the operating mode is the cooling mode, determine that the air conditioner meets the first condition.

[0024] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: Through the solution of this embodiment, it is possible to accurately determine whether the air conditioner meets the first condition, thereby improving the stability of the control method of the present invention.

[0025] In one embodiment of the present invention, S220 includes:

[0026] S221: Compare the interval time with the first time threshold;

[0027] S222: When the interval time is less than or equal to the first time threshold, determine that the air conditioner meets the second condition.

[0028] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: Through the solution of this embodiment, it is possible to accurately determine whether the air conditioner meets the second condition, thereby improving the stability of the control method of the present invention.

[0029] In one embodiment of the present invention, S230 includes:

[0030] S231: Compare the maximum value of the first waiting time and the second waiting time with the second time threshold;

[0031] S232: When the maximum value of the first waiting time and the second waiting time is greater than or equal to the second time threshold, determine that the air conditioner meets the third condition.

[0032] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: Through the solution of this embodiment, it is possible to accurately determine whether the air conditioner meets the third condition, thereby improving the stability of the control method of the present invention.

[0033] In one embodiment of the present invention, after S200, the control method further includes:

[0034] S310: When the air conditioner needs to execute the oil return scheme, control the compressor frequency to the preset oil return frequency;

[0035] S320: Control the indoor electronic expansion valve to open.

[0036] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: Through the solution of this embodiment, the stability and reliability of the control method of the present invention are effectively improved. This solution can determine the lack of oil in the system and handle the possible oil shortage problems.

[0037] To achieve the second objective of the present invention, an embodiment of the present invention provides a control device for an air conditioner. The control device includes: a detection module configured to obtain an outer ring temperature, an operating mode, an interval time between the power-on of the air conditioner and the startup of the air conditioner, a first waiting time for the air conditioner to establish an exhaust superheat degree, and a second waiting time for the air conditioner to establish a suction superheat degree when the air conditioner is started up; a control module configured to determine whether the air conditioner needs to execute an oil return scheme according to the outer ring temperature, the operating mode, the interval time, the first waiting time, and the second waiting time; wherein, the first waiting time is the time from the startup of the air conditioner to when the exhaust superheat degree reaches a first preset temperature, and the second waiting time is the time from the startup of the air conditioner to when the suction superheat degree reaches a second preset temperature.

[0038] The control device of the air conditioner in the embodiment of the present invention implements the steps of the control method in any embodiment of the present invention, and thus has all the beneficial effects of the control method in any embodiment of the present invention, which will not be elaborated herein.

[0039] To achieve the third objective of the present invention, an embodiment of the present invention provides an air conditioner, which includes: a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the control method in any embodiment of the present invention are implemented.

[0040] The air conditioner in the embodiment of the present invention implements the steps of the control method in any embodiment of the present invention, and thus has all the beneficial effects of the control method in any embodiment of the present invention, which will not be elaborated herein.

[0041] To achieve the fourth objective of the present invention, an embodiment of the present invention provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the control method in any embodiment of the present invention are implemented.

[0042] The readable storage medium in the embodiment of the present invention implements the steps of the control method in any embodiment of the present invention, and thus has all the beneficial effects of the control method in any embodiment of the present invention, which will not be elaborated herein. Description of the Drawings

[0043] Figure 1 It is a flowchart of the steps of the control method for the oil return of the air conditioner compressor in some embodiments of the present invention. Detailed Embodiments

[0044] To make the above objectives, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the accompanying drawings.

[0045] See Figure 1 , this embodiment provides a control method for the oil return of an air conditioner compressor. The control method includes:

[0046] S100: When the air conditioner is turned on, obtain the outdoor ambient temperature, the operating mode, the interval time between the power-on of the air conditioner and the startup of the air conditioner, the first waiting time for the air conditioner to establish the discharge superheat, and the second waiting time for the air conditioner to establish the suction superheat;

[0047] S200: Determine whether the air conditioner needs to execute an oil return scheme according to the outdoor ambient temperature, the operating mode, the interval time, the first waiting time, and the second waiting time;

[0048] Among them, the first waiting time is the time from when the air conditioner is turned on until the discharge superheat reaches the first preset temperature, and the second waiting time is the time from when the air conditioner is turned on until the suction superheat reaches the second preset temperature.

[0049] When the air conditioner system is powered off and placed under low-temperature conditions, the refrigerant is stored in the low-pressure side pipeline, the gas-liquid separator, and the compressor in a liquid state. When the air conditioner system is powered on and then turned on, the compressor will suck in a large amount of liquid refrigerant. The lubricating oil in the compressor dissolves in the liquid refrigerant and is discharged from the compressor in large quantities as the refrigerant is discharged, resulting in oil shortage in the compressor. From the analysis of the oil demand of the compressor, when the air conditioner system operates in refrigeration mode under low-temperature environment, the oil sump temperature is low, the oil temperature superheat is low, the viscosity of the lubricating oil is high, and the oil discharge rate is low. At this time, the system capacity demand is small, the compressor operating frequency is low, the high-low pressure difference is small, and it is relatively difficult for the crankshaft to bring the oil into the cylinder, and it is also relatively difficult to form an oil film. Due to the weak refrigerant circulation, it is difficult for the lubricating oil outside the compressor to return to the compressor, and the situation of oil shortage after startup may not be improved for a long time, threatening the reliable operation of the compressor.

[0050] Further, in S100, the outdoor ambient temperature refers to the outdoor environmental temperature, which is detected by a temperature sensor installed on the outdoor unit of the air conditioner; the operating mode refers to the operating mode of the air conditioner system, including but not limited to the refrigeration mode, the heating mode, etc.; the power-on of the air conditioner refers to the power-on of the air conditioner system, and the startup of the air conditioner refers to the startup of the indoor unit of the air conditioner. The interval time between the power-on of the air conditioner and the startup of the air conditioner refers to the duration between the moment when the air conditioner system is powered on and the moment when the air conditioner is started; the discharge superheat refers to the difference between the exhaust temperature of the unit and the saturation temperature corresponding to the exhaust pressure, and the first waiting time is the time when the discharge superheat reaches the first preset temperature after the indoor unit of the air conditioner is started; the suction superheat refers to the difference between the suction temperature of the unit and the saturation temperature corresponding to the suction pressure, and the second waiting time is the time when the suction superheat reaches the second preset temperature after the indoor unit of the air conditioner is started.

[0051] Preferably, the first preset temperature is set to 15 °C - 20 °C; the second preset temperature is set to 2 °C - 5 °C.

[0052] Further, in S200, it is determined whether the air conditioner needs to execute an oil return scheme according to the outer ring temperature, operating mode, interval time, first waiting time, and second waiting time; that is, when the outer ring temperature, operating mode, interval time, first waiting time, and second waiting time meet the corresponding conditions, it is determined that the air conditioner needs to execute an oil return scheme.

[0053] It can be understood that the solution of this embodiment can accurately determine the oil shortage situation of the air conditioner system, effectively improving the reliability of the control method of the present invention.

[0054] Further, in a specific embodiment, S200 includes:

[0055] S210: Determine whether the air conditioner meets the first condition according to the outer ring temperature and operating mode;

[0056] S220: Determine whether the air conditioner meets the second condition according to the interval time;

[0057] S230: Determine whether the air conditioner meets the third condition according to the first waiting time and the second waiting time;

[0058] S240: When the first condition, the second condition, and the third condition are all met, it is determined that the air conditioner needs to execute an oil return scheme.

[0059] It should be noted that when any one of the first condition, the second condition, and the third condition is not met, it is determined that the air conditioner does not need to execute an oil return scheme, and the air conditioner operates normally.

[0060] It can be understood that in this embodiment, different judgment conditions are executed for different parameter data, further improving the accuracy of the method of the present invention in judging the oil shortage situation of the air conditioner system.

[0061] Further, in a specific embodiment, S210 includes:

[0062] S211: Compare the outer ring temperature with the first temperature threshold;

[0063] S212: When the outer ring temperature is less than or equal to the first temperature threshold and the operating mode is the cooling mode, it is determined that the air conditioner meets the first condition.

[0064] Preferably, the first temperature threshold is set to 10 degrees Celsius.

[0065] In this embodiment, when the outer ring temperature is less than or equal to the first temperature threshold, it indicates that the outer ring temperature is relatively low at this time. At this time, the oil sump temperature is low, the oil temperature superheat is low, the lubricating oil viscosity is high, and the oil drainage rate is low. If the operating mode of the air conditioner is the cooling mode at this time, the air conditioner meets the first condition, that is, only when the first condition is met, the air conditioner may have a demand for oil return.

[0066] It can be understood that through the solution of this embodiment, it is possible to accurately determine whether the air conditioner meets the first condition, thereby improving the stability of the control method of the present invention.

[0067] Further, in a specific embodiment, S220 includes:

[0068] S221: Compare the interval time with the first time threshold;

[0069] S222: When the interval time is less than or equal to the first time threshold, it is determined that the air conditioner meets the second condition.

[0070] Preferably, the first time threshold is set to 8 hours.

[0071] It should be noted that if the air conditioner system remains powered on all the time, the compressor will not accumulate liquid, so the compressor electric heating device can evaporate the refrigerant in the compressor oil sump.

[0072] In this embodiment, calculating the interval time between the power-on of the air conditioner and the startup of the air conditioner mainly takes into account that when placed in a low-temperature environment, the compressor may accumulate liquid. If the time from power-off to power-on of the air conditioner is short, the compressor electric heating device cannot evaporate the refrigerant in the compressor oil sump; therefore, when the interval time is less than or equal to the first time threshold, it is determined that the air conditioner meets the second condition.

[0073] It can be understood that through the solution of this embodiment, it is possible to accurately determine whether the air conditioner meets the second condition, thereby improving the stability of the control method of the present invention.

[0074] Further, in a specific embodiment, S230 includes:

[0075] S231: Compare the maximum value of the first waiting time and the second waiting time with the second time threshold;

[0076] S232: When the maximum value of the first waiting time and the second waiting time is greater than or equal to the second time threshold, it is determined that the air conditioner meets the third condition.

[0077] Preferably, the second time threshold is set to 10 minutes.

[0078] In this embodiment, the first waiting time is the time when the exhaust superheat reaches the first preset temperature after the indoor unit of the air conditioner is turned on; the second waiting time is the time when the suction superheat reaches the second preset temperature after the indoor unit of the air conditioner is turned on; the lengths of the suction superheat and the exhaust superheat time actually represent the severity of liquid storage or liquid return of the compressor in the air conditioner system. When there is a large amount of liquid storage or serious liquid return in the compressor, the time to establish the exhaust superheat and the suction superheat will be relatively long. In the case of a large amount of liquid storage and serious liquid return in the compressor, the lubricating oil inside the compressor will be carried out of the compressor along with the discharge of the refrigerant, resulting in oil shortage in the compressor. Therefore, the maximum value of the first waiting time and the second waiting time is compared with the second time threshold. When the maximum value of the first waiting time and the second waiting time is greater than or equal to the second time threshold, it is determined that the air conditioner meets the third condition.

[0079] It can be understood that through the solution of this embodiment, it is possible to accurately determine whether the air conditioner meets the third condition, thereby improving the stability of the control method of the present invention.

[0080] Further, in a specific embodiment, after S200, the control method further includes:

[0081] S310: When the air conditioner needs to execute the oil return scheme, control the compressor frequency to the preset oil return frequency;

[0082] S320: Control the indoor electronic expansion valve to open.

[0083] In this embodiment, when the first condition, the second condition, and the third condition are all met, the air conditioner needs to execute the oil return scheme. At this time, control the compressor frequency to the preset oil return frequency, and the preset oil return frequency is a relatively high frequency in the operating frequency of the air conditioner; at the same time, control the indoor electronic expansion valve to open. If it is a multi-connected air conditioner system, control the electronic expansion valves of all indoor units to open to increase the refrigerant flow rate in the system and accelerate the oil return process.

[0084] It can be understood that through the solution of this embodiment, the stability and reliability of the control method of the present invention are effectively improved. This solution can determine the oil shortage situation of the system and handle the possible oil shortage problems.

[0085] Further, this embodiment provides a control device for an air conditioner, and the control device includes:

[0086] A detection module, which is used to obtain the outer ring temperature, the operating mode, the interval time between the power-on of the air conditioner and the start-up of the air conditioner, the first waiting time for the air conditioner to establish the exhaust superheat, and the second waiting time for the air conditioner to establish the suction superheat when the air conditioner is turned on;

[0087] A control module, which is used to determine whether the air conditioner needs to execute an oil return scheme according to the outer ring temperature, operating mode, interval time, first waiting time, and second waiting time;

[0088] Wherein, the first waiting time is the time from when the air conditioner is turned on until the exhaust superheat reaches the first preset temperature, and the second waiting time is the time from when the air conditioner is turned on until the suction superheat reaches the second preset temperature.

[0089] The control device of the air conditioner according to the embodiment of the present invention implements the steps of the control method according to any embodiment of the present invention, and thus has all the beneficial effects of the control method according to any embodiment of the present invention, which will not be elaborated herein.

[0090] Furthermore, this embodiment provides an air conditioner, which includes: a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, it implements the steps of the control method according to any embodiment of the present invention.

[0091] The air conditioner according to the embodiment of the present invention implements the steps of the control method according to any embodiment of the present invention, and thus has all the beneficial effects of the control method according to any embodiment of the present invention, which will not be elaborated herein.

[0092] Furthermore, this embodiment provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by the processor, it implements the steps of the control method according to any embodiment of the present invention.

[0093] The readable storage medium according to the embodiment of the present invention implements the steps of the control method according to any embodiment of the present invention, and thus has all the beneficial effects of the control method according to any embodiment of the present invention, which will not be elaborated herein.

[0094] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined by the claims.

Claims

1. A control method for oil return of an air conditioner compressor, characterized in that, The described control method is applicable to the refrigeration operation of the air conditioner system in a low-temperature environment; If the air conditioner system remains powered on all the time, the compressor will not have liquid accumulation, and the compressor electric heating device can evaporate the refrigerant in the compressor oil sump. The control method includes: S100: When the air conditioner is turned on, obtain the outer ring temperature, operating mode, the interval time between the power-on of the air conditioner and the startup of the air conditioner, the first waiting time for the air conditioner to establish the discharge superheat degree, and the second waiting time for the air conditioner to establish the suction superheat degree; S200: According to the outer ring temperature, the operating mode, the interval time, the first waiting time, and the second waiting time, determine whether the air conditioner needs to execute the oil return scheme; Wherein, the first waiting time is the time from the startup of the air conditioner to when the discharge superheat degree reaches the first preset temperature, and the second waiting time is the time from the startup of the air conditioner to when the suction superheat degree reaches the second preset temperature.

2. The control method according to claim 1, wherein The S200 includes: S210: According to the outer ring temperature and the operating mode, determine whether the air conditioner meets the first condition; S220: According to the interval time, determine whether the air conditioner meets the second condition; S230: According to the first waiting time and the second waiting time, determine whether the air conditioner meets the third condition; S240: When the first condition, the second condition, and the third condition are all met, determine that the air conditioner needs to execute the oil return scheme.

3. The control method according to claim 2, wherein The S210 includes: S211: Compare the outer ring temperature with the first temperature threshold; S212: When the outer ring temperature is less than or equal to the first temperature threshold and the operating mode is the refrigeration mode, determine that the air conditioner meets the first condition.

4. The control method according to claim 2, wherein The S220 includes: S221: Compare the interval time with the first time threshold; S222: When the interval time is less than or equal to the first time threshold, determine that the air conditioner meets the second condition.

5. The control method according to claim 2, wherein The S230 includes: S231: Compare the maximum value of the first waiting time and the second waiting time with the second time threshold; S232: When the maximum value of the first waiting time and the second waiting time is greater than or equal to the second time threshold, determine that the air conditioner meets the third condition.

6. The control method according to any one of claims 1 to 5, characterized in that, After the S200, the control method further includes: S310: When the air conditioner needs to execute the oil return scheme, control the compressor frequency to the preset oil return frequency; S320: Control the indoor electronic expansion valve to open.

7. A control device for an air conditioner, characterized in that, The described control method is applicable to the refrigeration operation of the air conditioner system in a low-temperature environment; If the air conditioner system remains powered on all the time, the compressor will not have liquid accumulation, and the compressor electric heating device can evaporate the refrigerant in the compressor oil sump. The control device includes: A detection module, which is used to obtain the outer ring temperature, the operating mode, the interval time between the power-on of the air conditioner and the startup of the air conditioner, the first waiting time for the air conditioner to establish the discharge superheat degree, and the second waiting time for the air conditioner to establish the suction superheat degree when the air conditioner is started up; A control module, which is used to judge whether the air conditioner needs to execute an oil return scheme according to the outer ring temperature, the operating mode, the interval time, the first waiting time, and the second waiting time; Wherein, the first waiting time is the time from the startup of the air conditioner to the discharge superheat degree reaching a first preset temperature, and the second waiting time is the time from the startup of the air conditioner to the suction superheat degree reaching a second preset temperature.

8. An air conditioner, characterized in that, The air conditioner includes: a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the control method according to any one of claims 1 to 6 are implemented.

9. A readable storage medium, characterized in that, A program or instruction is stored on the readable storage medium. When the program or instruction is executed by the processor, the steps of the control method according to any one of claims 1 to 6 are implemented.

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