CN111141075B - Air conditioner control method and device, air conditioner and storage medium - Google Patents

Air conditioner control method and device, air conditioner and storage medium Download PDF

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Publication number
CN111141075B
CN111141075B CN202010010276.3A CN202010010276A CN111141075B CN 111141075 B CN111141075 B CN 111141075B CN 202010010276 A CN202010010276 A CN 202010010276A CN 111141075 B CN111141075 B CN 111141075B
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preset
frequency
compressor
air conditioner
pressure
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CN111141075A (en
Inventor
余超群
刘潘
刘合心
黄春
陈华
邓赛峰
王猛
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air

Abstract

The invention provides a control method and a control device of an air conditioner, the air conditioner and a storage medium, and relates to the technical field of air conditioners, wherein the control method comprises the following steps: when receiving an instruction of operating in an oil return mode, acquiring the current outdoor environment temperature; determining the running frequency of a compressor and the opening of an electronic expansion valve of an indoor unit according to the current outdoor environment temperature; and correcting the running frequency of the compressor according to the acquired high-pressure. In the prior art, the control method of the air conditioner can achieve the purpose of oil return by correcting the operation parameters of the compressor and the opening degree of the indoor electronic expansion valve without reversing through a four-way reversing valve to perform oil return, and avoids the phenomenon that the comfort of users is influenced due to overlarge indoor temperature fluctuation caused by reversing oil return.

Description

Air conditioner control method and device, air conditioner and storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of an air conditioner, the air conditioner and a storage medium.
Background
In the prior art, when the multi-split air conditioner is operated for heating, a refrigerant is changed into gas by a compressor at high temperature and high pressure in the compressor, the refrigerant is discharged from the compressor, a part of lubricating oil can be taken away, and the lubricating oil is accumulated in an evaporator and a condenser along with the circulating flow of the refrigerant, so that the defects brought by the fact that: the air conditioner does not return oil for a long time, and the oil stored in the evaporator or the condenser can influence the heating effect of the air conditioner; the compressor is lack of lubricating oil for a long time, so that the friction of the bearing in the compressor is increased to aggravate the compression damage.
The oil return method of the multi-split air conditioner at present is reversing oil return, which causes great indoor temperature fluctuation and influences the comfort of users.
Disclosure of Invention
The invention solves the problem that the oil return method of the existing air conditioner is reversing oil return, which causes great fluctuation of indoor temperature and influences the comfort of users.
In order to solve the above problems, the present invention provides a control method of an air conditioner, including, when receiving an instruction to operate in an oil return mode, acquiring a current outdoor environment temperature; determining the running frequency of a compressor and the opening of an electronic expansion valve of an indoor unit according to the current outdoor environment temperature; and correcting the running frequency of the compressor for preset time according to the acquired high-pressure.
Therefore, when the air conditioner runs in a heating mode, the system automatically enters an oil return mode due to the fact that the compressor lacks lubricating oil, and the running frequency of the air conditioner compressor and the opening degree of an electronic expansion valve of an indoor unit are set according to the current outdoor environment; and correcting the running frequency of the compressor according to the acquired high-pressure of the air conditioning system within the preset time. Can not carry out the switching-over oil return through four-way reversing valve, can also guarantee the normal oil return of compressor, indoor temperature is not influenced to the result of use that does not influence the user.
Further, the determining the operation frequency of the compressor and the opening degree of the electronic expansion valve of the indoor unit according to the current outdoor environment temperature includes: and when the current outdoor environment temperature is lower than a first preset temperature, controlling the running frequency of the compressor to be a first preset frequency, and controlling the opening of the electronic expansion valve of the indoor unit to be a first preset opening.
Therefore, the current outdoor environment temperature is lower than the first preset temperature, which indicates that the outdoor environment temperature is low, the viscosity of the lubricating oil is high, and the flowing speed of the lubricating oil is low, so that the operation frequency of the compressor and the opening degree of the electronic expansion valve of the indoor unit need to be adjusted to relatively high operation parameters, that is, the operation frequency of the compressor is adjusted to the first preset frequency, and the opening degree of the electronic expansion valve of the indoor unit is adjusted to the first preset opening degree of the electronic expansion valve. Therefore, the oil return is ensured to be completed within the time of the air conditioner operation mode.
Further, the correcting the operation frequency of the compressor according to the acquired high-pressure comprises: when the oil return mode is operated for a preset time, acquiring high pressure; when the high-pressure is smaller than a first preset pressure, controlling the running frequency of the compressor to be a first preset frequency and keeping the running frequency unchanged; and when the high-pressure is greater than or equal to the first preset pressure, controlling the running frequency of the compressor to be the difference value between the first preset frequency and the preset correction frequency.
Therefore, after the air conditioner runs for the preset time according to the running frequency of the air conditioner compressor and the opening degree of the electronic expansion valve of the indoor unit, the high-pressure of the air conditioner exceeds the first preset pressure, the system may start high-pressure protection, and in order to avoid shutdown protection caused by overhigh high-pressure, the running frequency of the compressor needs to be corrected.
Further, the determining the operation frequency of the compressor and the opening of the electronic expansion valve of the indoor unit according to the current outdoor environment temperature further includes:
when the current outdoor environment temperature is greater than or equal to the first preset temperature and less than or equal to a second preset temperature, controlling the running frequency of the compressor to be a second preset frequency, and controlling the opening of the electronic expansion valve of the indoor unit to be a second preset opening; the second preset frequency is smaller than the first preset frequency, and the second preset opening degree is smaller than the first preset opening degree.
Therefore, the current outdoor environment temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, which shows that the outdoor environment temperature is right, the viscosity of the lubricating oil is moderate, and the flow of the lubricating oil is moderate, so that the operation frequency of the compressor and the opening of the electronic expansion valve of the indoor unit need to be increased to the normal oil return parameter, namely the operation frequency of the compressor is adjusted to the second preset frequency, and the opening of the electronic expansion valve of the indoor unit is adjusted to the second preset electronic expansion valve. Therefore, the oil return is completed within the time of the air conditioner operation mode.
Further, the correcting the operation frequency of the compressor according to the acquired high-pressure comprises: when the high-pressure is smaller than the first preset pressure, controlling the running frequency of the compressor to be a second preset frequency and keeping the running frequency unchanged; and when the high-pressure is greater than or equal to the first preset pressure, controlling the running frequency of the compressor to be the difference value between the second preset frequency and the preset correction frequency.
Therefore, the high-pressure of the air conditioner exceeds the first preset pressure, the system may start high-pressure protection, and in order to avoid shutdown protection caused by overhigh high-pressure, the operation frequency of the non-compressor needs to be corrected.
Further, the determining the operation frequency of the compressor and the opening of the electronic expansion valve of the indoor unit according to the current outdoor environment temperature further includes: when the current outdoor environment temperature is higher than the second preset temperature, controlling the running frequency of the compressor to be a third preset frequency, and controlling the opening of an electronic expansion valve of the indoor unit to be a third preset opening; wherein the third preset frequency is less than the second preset frequency; the third preset opening degree is smaller than the second preset opening degree.
Therefore, the current outdoor environment temperature is higher than the second preset temperature, which indicates that the outdoor environment temperature is higher, the viscosity of the lubricating oil is lower, and the flowing speed of the lubricating oil is higher, so that the parameters for increasing the operation frequency of the compressor and the opening of the electronic expansion valve of the indoor unit are lower, that is, the operation frequency of the compressor is adjusted to be the third preset frequency, and the opening of the electronic expansion valve of the indoor unit is adjusted to be the third preset electronic expansion valve. Therefore, the oil return is completed within the time of the air conditioner operation mode. Further, the continuously controlling according to the high pressure of the air conditioner to correct the operation frequency of the compressor and the opening of the electronic expansion valve of the indoor unit includes: when the high-pressure of the air conditioner is smaller than the first preset pressure, controlling the running frequency of the compressor to be a third preset frequency and keeping the third preset frequency unchanged; and when the high-pressure of the air conditioner is greater than or equal to the first preset pressure, controlling the running frequency of the compressor to be the difference value between the third preset frequency and the preset correction frequency.
Therefore, the high-pressure of the air conditioner exceeds the first preset pressure, the system may start high-pressure protection, and in order to avoid shutdown protection caused by overhigh high-pressure, the operation frequency of the non-compressor needs to be corrected.
Compared with the prior art, the control method of the air conditioner has the advantages that the control method of the air conditioner can achieve the purpose of oil return by correcting the operation parameters of the compressor and the opening degree of the indoor electronic expansion valve without reversing through the four-way reversing valve to perform oil return, and the phenomenon that the comfort of users is influenced due to overlarge indoor temperature fluctuation caused by reversing oil return is avoided.
In order to solve the technical problem, the invention also provides a control device of the air conditioner, which comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for receiving an oil return mode operation instruction;
the acquisition unit is also used for acquiring the current outdoor environment temperature and high pressure;
the computing unit is used for determining the running frequency of the compressor and the opening of the electronic expansion valve of the indoor unit according to the current outdoor environment temperature;
and the control unit is used for correcting the running frequency of the compressor according to the acquired high-pressure.
Therefore, when the air conditioner runs in a heating mode, the system automatically enters an oil return mode due to the fact that the compressor lacks lubricating oil, the current outdoor environment is obtained through the obtaining unit, and the running frequency of the air conditioner compressor and the opening degree of the electronic expansion valve of the indoor unit are calculated through the calculating unit; and after the air conditioner compressor operates for a preset time according to the operating frequency of the air conditioner compressor and the opening of the electronic expansion valve of the indoor unit, correcting the operating frequency of the compressor according to the high-pressure control of the air conditioning system acquired by the acquisition unit. Can not carry out the switching-over oil return through four-way reversing valve, can also guarantee the normal oil return of compressor, indoor temperature is not influenced to the result of use that does not influence the user.
The advantages of the control device of the air conditioner of the invention relative to the prior art are the same as the advantages of the control method of the air conditioner relative to the prior art, and are not repeated herein.
In order to solve the technical problem, the present invention further provides an air conditioner, including a computer readable storage medium storing a computer program and a processor, where the computer program is read and executed by the processor to implement the control method of the air conditioner.
Therefore, when the air conditioner runs in a heating mode, the system automatically enters an oil return mode due to the fact that the compressor lacks lubricating oil, and the running frequency of the air conditioner compressor and the opening degree of an electronic expansion valve of an indoor unit are set according to the current outdoor environment; and after the air conditioner compressor runs for a preset time according to the running frequency of the air conditioner compressor and the opening of the electronic expansion valve of the indoor unit, correcting the running frequency of the compressor according to the acquired high-pressure of the air conditioner system. Can not carry out the switching-over oil return through four-way reversing valve, can also guarantee the normal oil return of compressor, indoor temperature is not influenced to the result of use that does not influence the user.
Other advantages of the air conditioner of the present invention over the prior art are the same as those of the control method of the air conditioner over the prior art, and are not described herein again.
In order to solve the technical problem, the present invention further provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is read and executed by a processor, the control method of the air conditioner is implemented.
The advantages of the computer-readable storage medium of the present invention over the prior art are the same as the advantages of the control method of the air conditioner over the prior art, and are not described herein again.
Drawings
Fig. 1 is a first flowchart of a control method of an air conditioner according to an embodiment of the present invention;
fig. 2 is a second flowchart of a control method of an air conditioner in the embodiment of the present invention.
Detailed Description
When the multi-split system operates in a heating mode, because the air suction pipe of the compressor is thick, the four-way reversing valve is reversed, the flow velocity of refrigerant entering the internal machine is reduced, and oil accumulation is caused. Therefore, the air conditioner automatically enters the oil return mode.
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the appended drawings.
In the description of the present invention, it is to be understood that the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as being equal to or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. The description of the term "some embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Throughout this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1-2, an embodiment of the present invention provides a method for controlling an air conditioner, including the following steps:
s1, when an instruction of operating in an oil return mode is received, acquiring the current outdoor environment temperature;
s2, according to the current outdoor environment temperature T1Determining the running frequency f of a compressor and the opening EEV of an electronic expansion valve of an indoor unit;
s3, according to the acquired high-pressure PdThe control continues to correct the compressor operating frequency f.
When the air conditioner runs in a heating mode, because the compressor lacks lubricating oil, the system automatically enters an oil return mode, and then the running frequency of the air conditioner compressor and the opening degree of an electronic expansion valve of an indoor unit are set according to the current outdoor environment; and correcting the running frequency of the compressor according to the acquired high-pressure of the air conditioning system. Can not carry out the switching-over oil return through four-way reversing valve, can also guarantee the normal oil return of compressor, indoor temperature is not influenced to the result of use that does not influence the user.
In some embodiments, step S2 is based on the current outdoor ambient temperature T1Determining the operation frequency f of the compressor and the opening EEV of the electronic expansion valve of the indoor unit, comprising the following steps:
s21, current outdoor environment temperature T1< first predetermined temperature TaThen, then pressThe operation frequency f of the compressor is equal to the first preset frequency H1The opening EEV of the electronic expansion valve of the indoor unit is equal to the first preset opening PLS1。
Current outdoor ambient temperature T1Less than a first predetermined temperature TaThe outdoor environment temperature is low, the viscosity of the lubricating oil is high, and the flowing speed of the lubricating oil is low, so that the operation frequency of the compressor and the opening degree of the electronic expansion valve of the indoor unit need to be adjusted to relatively high operation parameters, that is, the operation frequency of the compressor is adjusted to be a first preset frequency, and the opening degree of the electronic expansion valve of the indoor unit is adjusted to be a first preset electronic expansion valve opening degree. Therefore, the oil return is ensured to be completed within the time of the air conditioner operation mode.
S22, a first preset temperature TaLess than or equal to the current outdoor environment temperature T1Not more than second preset temperature TbWhen the frequency f is equal to the second preset frequency H, the operation frequency of the compressor is equal to the second preset frequency H2The opening EEV of the electronic expansion valve of the indoor unit is equal to the second preset opening PLS2。
When the first preset temperature TaLess than or equal to the current outdoor environment temperature T1Not more than second preset temperature TbAnd the condition that the outdoor environment temperature is right, the viscosity of the lubricating oil is moderate, and the flow of the lubricating oil is moderate is indicated, so that the operation frequency of the compressor and the opening degree of the electronic expansion valve of the indoor unit need to be increased to the parameters of normal oil return, namely the operation frequency of the compressor is adjusted to be the second preset frequency, and the opening degree of the electronic expansion valve of the indoor unit is adjusted to be the second preset opening degree of the electronic expansion valve. Therefore, the oil return is completed within the time of the air conditioner operation mode.
S23, current outdoor environment temperature T1Greater than a second predetermined temperature TbWhen the frequency f is equal to the third preset frequency H, the operation frequency of the compressor is equal to the third preset frequency H3The opening EEV of the electronic expansion valve of the indoor unit is equal to a third preset opening PLS3。
Current outdoor ambient temperature T1Greater than a second predetermined temperature TbThe outdoor environment temperature is higher, the viscosity of the lubricating oil is lower, and the flowing speed of the lubricating oil is higher, so the parameters of the running frequency of the compressor and the opening degree of the electronic expansion valve of the indoor unit are required to be lower, namely the running frequency of the compressor is adjusted to be the third preset valueAnd adjusting the opening degree of the electronic expansion valve of the indoor unit to a third preset opening degree of the electronic expansion valve. Therefore, the oil return is completed within the time of the air conditioner operation mode.
Preferably, the range of the first preset temperature Ta is: -5 to 0 ℃; second predetermined temperature TbThe range of (A) is as follows: 5-10 ℃; the slower the flow rate, the lower the viscosity of the lubricating oil at lower outdoor ambient temperatures. Therefore, the oil viscosity is different at different outdoor ambient temperatures, so that the outdoor ambient temperature is divided into three sections.
Preferably, the first predetermined frequency H1The range of (A) is as follows: 70-80 Hz; second predetermined frequency H2The range of (A) is as follows: 60-70 Hz; third predetermined frequency H3The range of (A) is as follows: 50-60 Hz. The higher the outdoor ambient temperature, the lower the viscosity of the lubricating oil, the faster the flow rate, and the lower the compressor operating frequency. Conversely, the lower the outdoor ambient temperature, the slower the refrigerant flow rate, and the greater the compressor operating frequency.
Preferably, the first preset opening PLS1The range of (A) is as follows: 400-480 PLS; second preset opening PLS2The range of (A) is as follows: 300-400 PLS; third preset opening PLS3The range of (A) is as follows: 200-300 PLS. The lower the outdoor ambient temperature, the slower the refrigerant flow rate, and the larger the electronic expansion valve opening. Conversely, the higher the outdoor ambient temperature, the faster the refrigerant flow rate, and the smaller the opening of the electronic expansion valve.
S24, operating for a preset time t according to the oil return mode of the step S21, the step S22 or the step S23;
preferably, the preset time t is: 1-5 min; preferably, the preset time t is 3 min; and after the oil return mode of the air conditioning unit is ensured to run for a period of time, the system rationality judgment is carried out, and the oil return and reliability of the system are considered.
In some embodiments, after the step S21 is completed, and after the step S24 is continuously executed, the method further includes:
when the high pressure P of the air conditionerd< first preset pressure P1When the frequency is equal to the first preset frequency H, the running frequency of the compressor is controlled to be equal to the first preset frequency H1And keeping the same until the oil return mode is exited.
When the high pressure P of the air conditionerdNot less than the first preset pressure P1Then, the operation frequency of the compressor is controlled to be the first preset frequency H1-presetting the correction frequency Δ H until exiting the oil return mode.
Some embodiments, after the step S32 is completed, and the step S4 and the step S5 are further executed, the method further includes:
when the high pressure P of the air conditionerd< first preset pressure P1When the frequency is equal to the second preset frequency H, the running frequency of the compressor is controlled to be equal to the second preset frequency H2And keeping the same until the oil return mode is exited.
When the high pressure P of the air conditionerdNot less than the first preset pressure P1Then, the operation frequency of the compressor is controlled to be the second preset frequency H2-presetting the correction frequency Δ H until exiting the oil return mode.
Some embodiments, after the step S33 is completed, and the step S4 and the step S5 are further executed, the method further includes:
when the high pressure P of the air conditionerd< first preset pressure P1When the frequency is higher than the first preset frequency, the running frequency of the compressor is controlled to be equal to the second preset frequency H3And keeping the same until the oil return mode is exited.
When the high pressure P of the air conditionerdNot less than the first preset pressure P1Then, the running frequency of the compressor is controlled to be equal to a third preset frequency H3-presetting the correction frequency Δ H until exiting the oil return mode.
Thereby, the high pressure P of the air conditionerdExceeds a first predetermined pressure P1The system may start high pressure protection, and in order to avoid shutdown protection caused by too high pressure, the operating frequency of the compressor needs to be corrected.
Preferably, the first preset pressure P1The range of (A) is as follows: 37-41 bar. The operating frequency of the compressor can be corrected when the high pressure exceeds the first preset pressure. And the normal operation of the air conditioner is guaranteed.
The range of the preset correction frequency Δ H is: 5-15 Hz. The normal oil return of the system is ensured, and when the high pressure of the system is too high, the running frequency of the compressor is corrected, so that the protective shutdown caused by the too high pressure is prevented.
The following is detailed according to the actual situation:
in this example Ta＝0℃，Tb＝10℃，P1＝37bar；
Obtaining ambient temperature T1When T is1When the temperature is lower than 0 ℃, the oil return mode is controlled according to the step S31, and the running frequency of the compressor is adjusted to the first preset frequency H1(70Hz), the opening EEV of the electronic expansion valve of the indoor unit is a first preset opening PLS1(ii) a After running for 3min, obtaining the high pressure P of the systemdJudging the high pressure PdWhether or not < first preset pressure P1(37bar), if yes, returning oil to the system to finish; if not, the running frequency f of the compressor is changed to the preset correction frequency delta H (10Hz) until the oil return is finished.
When 0 ℃ is less than T1When the temperature is lower than 10 ℃, the oil return mode is controlled according to the step S32, and the running frequency of the compressor is adjusted to a second preset frequency H2(60Hz), the opening EEV of the electronic expansion valve of the indoor unit is a second preset opening PLS2(ii) a After running for 3min, obtaining the high pressure P of the systemdJudging the high pressure PdWhether or not < first preset pressure P1(37bar), if yes, returning oil to the system to finish; if not, the running frequency f of the compressor is changed to the preset correction frequency delta H (10Hz) until the oil return is finished.
When T is1When the temperature is higher than 10 ℃, the oil return mode is controlled according to the step S33, and the running frequency of the compressor is adjusted to a third preset frequency H3(50Hz), the opening EEV of the electronic expansion valve of the indoor unit is a third preset opening PLS3(ii) a After running for 3min, obtaining the high pressure P of the systemdJudging the high pressure PdWhether or not < first preset pressure P1(37bar), if yes, returning oil to the system to finish; if not, the running frequency f of the compressor is changed to the preset correction frequency delta H (10Hz) until the oil return is finished.
The control method of the air conditioner can achieve the oil return purpose by correcting the operation parameters of the compressor and the opening of the indoor electronic expansion valve without reversing through the four-way reversing valve, thereby avoiding the overhigh system high-pressure protection shutdown or the liquid-carrying operation of the compressor caused by the fact that the operation frequency of the compressor is equal to the operation frequency of the indoor unit and the opening of the indoor unit electronic expansion valve is overlarge.
Another embodiment of the present invention provides a control apparatus of an air conditioner, including,
the acquisition unit is used for receiving an oil return mode operation instruction;
the acquisition unit is also used for acquiring the current outdoor environment temperature and high pressure;
the computing unit is used for determining the running frequency of the compressor and the opening of the electronic expansion valve of the indoor unit according to the current outdoor environment temperature;
and the control unit is used for continuously controlling and correcting the running frequency of the compressor according to the acquired high-pressure.
When the air conditioner runs in a heating mode, because the compressor lacks lubricating oil, the system automatically enters an oil return mode, the current outdoor environment is obtained through the obtaining unit, and the running frequency of the air conditioner compressor and the opening degree of the electronic expansion valve of the indoor unit are calculated through the calculating unit; and correcting the running frequency of the compressor according to the high-pressure control of the air conditioning system acquired by the acquisition unit. Can not carry out the switching-over oil return through four-way reversing valve, can also guarantee the normal oil return of compressor, indoor temperature is not influenced to the result of use that does not influence the user.
The advantages of the control device of the air conditioner of the invention relative to the prior art are the same as the advantages of the control method of the air conditioner relative to the prior art, and are not repeated herein.
Another embodiment of the present invention also provides an air conditioner including a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed to implement the control method of the air conditioner as described above.
Therefore, when the air conditioner runs in a heating mode, the system automatically enters an oil return mode due to the fact that the compressor lacks lubricating oil, and the running frequency of the air conditioner compressor and the opening degree of an electronic expansion valve of an indoor unit are set according to the current outdoor environment; and after the air conditioner compressor runs for a preset time according to the running frequency of the air conditioner compressor and the opening of the electronic expansion valve of the indoor unit, correcting the running frequency of the compressor according to the acquired high-pressure of the air conditioner system. Can not carry out the switching-over oil return through four-way reversing valve, can also guarantee the normal oil return of compressor, indoor temperature is not influenced to the result of use that does not influence the user.
Other advantages of the air conditioner of the present invention over the prior art are the same as those of the control method of the air conditioner over the prior art, and are not described herein again.
The present invention also provides a computer-readable storage medium storing a computer program, which when read and executed by a processor, implements the control method of the air conditioner as described above.
The advantages of the computer-readable storage medium in this embodiment over the prior art are the same as the advantages of the control method of the air conditioner over the prior art, and are not described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention, and it is intended that the scope of the invention be limited only by the claims appended hereto.

Claims (8)

1. A control method of an air conditioner, comprising:
when an instruction of operating in an oil return mode is received, acquiring the current outdoor environment temperature;
determining the operation frequency of a compressor and the opening of an electronic expansion valve of an indoor unit according to the current outdoor environment temperature, and specifically comprising the following steps:
when the current outdoor environment temperature is lower than a first preset temperature, controlling the running frequency of the compressor to be a first preset frequency, and controlling the opening of an electronic expansion valve of the indoor unit to be a first preset opening;
correcting the operating frequency of the compressor according to the acquired high-pressure, specifically comprising:
when the oil return mode is operated for a preset time, acquiring high pressure;
when the high-pressure is smaller than a first preset pressure, controlling the running frequency of the compressor to be a first preset frequency and keeping the running frequency unchanged;
and when the high-pressure is greater than or equal to the first preset pressure, controlling the running frequency of the compressor to be the difference value between the first preset frequency and the preset correction frequency.
2. The method for controlling an air conditioner according to claim 1, wherein the determining the operation frequency of the compressor and the opening degree of the electronic expansion valve of the indoor unit according to the current outdoor ambient temperature further comprises:
when the current outdoor environment temperature is greater than or equal to the first preset temperature and less than or equal to a second preset temperature, controlling the running frequency of the compressor to be a second preset frequency, and controlling the opening of the electronic expansion valve of the indoor unit to be a second preset opening; the second preset frequency is smaller than the first preset frequency, and the second preset opening degree is smaller than the first preset opening degree.
3. The control method of an air conditioner according to claim 2, wherein the correcting the operation frequency of the compressor according to the acquired high pressure includes:
when the high-pressure is smaller than the first preset pressure, controlling the running frequency of the compressor to be a second preset frequency and keeping the running frequency unchanged;
and when the high-pressure is greater than or equal to the first preset pressure, controlling the running frequency of the compressor to be the difference value between the second preset frequency and the preset correction frequency.
4. The method of claim 3, wherein the determining the compressor operation frequency and the opening degree of the electronic expansion valve of the indoor unit according to the current outdoor ambient temperature further comprises:
when the current outdoor environment temperature is higher than the second preset temperature, controlling the running frequency of the compressor to be a third preset frequency, and controlling the opening of an electronic expansion valve of the indoor unit to be a third preset opening; wherein the third preset frequency is less than the second preset frequency; the third preset opening degree is smaller than the second preset opening degree.
5. The control method of an air conditioner according to claim 4, wherein the correcting the operation frequency of the compressor according to the acquired high pressure includes:
when the high-pressure of the air conditioner is smaller than the first preset pressure, controlling the running frequency of the compressor to be a third preset frequency and keeping the running frequency unchanged;
and when the high-pressure of the air conditioner is greater than or equal to the first preset pressure, controlling the running frequency of the compressor to be the difference value between the third preset frequency and the preset correction frequency.
6. A control device of an air conditioner for realizing the control method according to any one of claims 1 to 5, the control device comprising:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for receiving an instruction of oil return mode operation;
the acquisition unit is also used for acquiring the current outdoor environment temperature and high pressure;
the computing unit is used for determining the running frequency of the compressor and the opening of the electronic expansion valve of the indoor unit according to the current outdoor environment temperature;
and the control unit is used for correcting the running frequency of the compressor according to the acquired high-pressure.
7. An air conditioner comprising a computer-readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the control method of the air conditioner according to any one of claims 1 to 5.
8. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the control method of an air conditioner according to any one of claims 1 to 5.
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CN113375273B (en) * 2021-06-24 2022-04-19 宁波奥克斯电气股份有限公司 Compressor frequency control method and device and air conditioner
CN115701514A (en) * 2021-08-02 2023-02-10 美的集团股份有限公司 Air conditioner control method, air conditioner, storage medium and device
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