CN111998499A - Oil return control method and device, air conditioner and storage medium - Google Patents
Oil return control method and device, air conditioner and storage medium Download PDFInfo
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- CN111998499A CN111998499A CN202010914605.7A CN202010914605A CN111998499A CN 111998499 A CN111998499 A CN 111998499A CN 202010914605 A CN202010914605 A CN 202010914605A CN 111998499 A CN111998499 A CN 111998499A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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Abstract
The invention provides an oil return control method, an oil return control device, an air conditioner and a storage medium, which relate to the technical field of air conditioners and comprise the following steps: detecting whether the air conditioner enters an oil return operation state, wherein in the oil return operation state, the air conditioner operates in a cooling mode or a heating mode, and accumulated lubricating oil is returned to the compressor; if the air conditioner enters an oil return running state, obtaining the running frequency of the air conditioner during oil return; and controlling the oil return time of the air conditioner according to the operating frequency during oil return and a preset oil return frequency threshold, wherein the oil return time is the operating time of the air conditioner in an oil return operating state. The invention aims to judge the condition of the running oil return of the air conditioner by the running frequency during oil return and the preset oil return frequency threshold value, and further effectively control the running time of the oil return running state, thereby ensuring the normal recovery of the engine oil of the compressor, ensuring the air conditioner to timely exit the oil return running state, avoiding overlarge system pressure and promoting the air conditioner to maintain effective running.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an oil return control method and device, an air conditioner and a storage medium.
Background
In the air conditioner system, after the compressor runs for a long time at low frequency, the situation that lubricating oil cannot be recovered due to poor oil carrying capacity of the compressor occurs, and at the moment, special oil return operation is executed to ensure that the lubricating oil accumulated in the system returns to the compressor, so that the compressor can normally run in a lubricating mode.
When the air conditioner is in an oil return running state, if the oil return operation running time is too long, the system load is too high, so that the oil return efficiency is low, and the refrigerating and heating effects are poor; if the operation time of the oil return operation is too short, the whole oil return is insufficient, and the compressor still cannot effectively and normally operate in a lubrication mode. However, in the existing air conditioner technology, a fixed oil return operation running time is generally set, different requirements for actual oil return running time under different running conditions are ignored, the situation that the oil return operation running time is too long or too short is likely to occur, and finally the whole running condition of the system is poor.
Disclosure of Invention
The invention solves the problem of accurately controlling the oil return time according to different running conditions.
In order to solve the above problems, the present invention provides an oil return control method, including:
detecting whether the air conditioner enters an oil return operation state, wherein in the oil return operation state, the air conditioner operates in a cooling mode or a heating mode, and accumulated lubricating oil is returned to the compressor;
if the air conditioner enters the oil return running state, the running frequency of the air conditioner during oil return is obtained;
and controlling the oil return time of the air conditioner according to the running frequency during oil return and a preset oil return frequency threshold value, wherein the oil return time is the running time of the air conditioner in the oil return running state.
Therefore, the frequency can efficiently reflect the operation condition of the system, so that the invention accurately judges the condition of the oil return of the air conditioner by comparing the operation frequency during oil return with the preset oil return frequency threshold value, thereby judging the requirement of the system for the oil return time according to the actual operation condition, effectively controlling the operation time of the oil return operation state, ensuring the normal recovery of the engine oil of the compressor, ensuring the air conditioner to timely quit the oil return operation state, avoiding the overlarge system pressure, promoting the air conditioner to maintain the effective operation, and facilitating the use of users.
Further, the detecting whether the air conditioner enters the oil return operation state includes:
and if the air conditioner runs at the low-frequency within the preset detection duration, the air conditioner enters the oil return running state, wherein the low-frequency is smaller than the preset oil return frequency.
Therefore, the air conditioner runs for a period of time at low frequency to indicate that the oil return is insufficient, and the air conditioner needs to enter the oil return running state to ensure that the compressor can normally lubricate and run, so that whether the air conditioner is in the oil return running state or not is accurately detected, and the oil return time can be conveniently controlled subsequently.
Further, the controlling the oil return duration of the air conditioner according to the operating frequency during oil return and a preset oil return frequency threshold value comprises:
and if the running frequency during oil return is greater than or equal to the oil return frequency threshold, the oil return time is preset oil return time.
Therefore, when the operation frequency during oil return is greater than or equal to the oil return frequency threshold, the oil return condition is better but the system operation load is larger, so that the corresponding preset oil return time is set, and the effectiveness of the system oil return operation is ensured.
Further, the controlling the oil return duration of the air conditioner according to the operating frequency during oil return and a preset oil return frequency threshold value comprises:
and if the running frequency during oil return is less than the oil return frequency threshold, controlling the oil return time length of the air conditioner according to a frequency difference value, wherein the frequency difference value is the difference between the running frequency during oil return and the oil return frequency threshold.
Therefore, when the operation frequency during oil return is smaller than the oil return frequency threshold, the oil return condition is general but the system operation load is smaller at the moment, but the degree of the oil return condition at the moment cannot be judged, so that the frequency difference is set for further judgment, the actual condition of the system operation is further judged according to the operation frequency during oil return and the oil return frequency threshold, and the effectiveness of the system oil return operation is further ensured.
Further, the controlling the oil return time length of the air conditioner according to the frequency difference comprises:
and if the frequency difference is smaller than a first deviation threshold, the oil return time length is the sum of a preset oil return time length and a first compensation time length.
Therefore, when the frequency difference is smaller than the first deviation threshold, the difference between the oil return condition and the ideal state is not large, so that the first compensation time length is increased on the basis of the preset oil return time length, the oil return operation is more sufficient, and the effective operation of the oil return is ensured.
Further, the controlling the oil return time length of the air conditioner according to the frequency difference comprises:
if the frequency difference value is between a first intermediate threshold and a second intermediate threshold, the oil return duration is the sum of the preset oil return duration and the intermediate compensation duration, wherein the first intermediate threshold is smaller than the second intermediate threshold, the first intermediate threshold is larger than or equal to the first deviation threshold, and the first compensation duration is smaller than the intermediate compensation duration.
Therefore, when the frequency difference value is between the first intermediate threshold and the second intermediate threshold, the difference of the oil return condition from the ideal state is shown, so that the intermediate compensation time length is increased on the basis of the preset oil return time length, and the effective operation of the oil return is ensured by using the longer oil return time length.
Further, when the first intermediate threshold is the first deviation threshold and the second intermediate threshold is the second deviation threshold, the intermediate compensation duration is the second compensation duration;
when the first intermediate threshold is the second deviation threshold and the second intermediate threshold is a third deviation threshold, the intermediate compensation duration is a third compensation duration;
when the first intermediate threshold is the third deviation threshold and the second intermediate threshold is a fourth deviation threshold, the intermediate compensation duration is a fourth compensation duration;
wherein the first deviation threshold is smaller than the second deviation threshold, the second deviation threshold is smaller than the third deviation threshold, the third deviation threshold is smaller than the fourth deviation threshold, the first compensation duration is smaller than the second compensation duration, the second compensation duration is smaller than the third compensation duration, and the third compensation duration is smaller than the fourth compensation duration.
Therefore, the first intermediate threshold and the second intermediate threshold have different values and correspond to different operating frequency ranges, and when the frequency difference value is in different operating frequency ranges, different intermediate compensation time lengths are set, so that the oil return time length is effectively controlled according to the system frequency operating condition. Meanwhile, according to different values of the first intermediate threshold and the second intermediate threshold, low-frequency operation, intermediate-frequency operation and high-frequency operation ranges are divided, the time length of the frequency difference value falling into different ranges corresponding to different intermediate compensation is long, the larger the frequency difference value is, the longer the oil return time is, the better oil return effect can be achieved while the high-pressure protection of the system is avoided, the service life of the compressor is prolonged, and the refrigerating and heating effects of the air conditioner are improved.
Another objective of the present invention is to provide an oil return control device, which utilizes the operating frequency during oil return and a preset oil return frequency threshold to determine the condition of oil return during operation of the air conditioner, so as to effectively control the operation duration of the oil return operation state, thereby ensuring normal recovery of engine oil of the compressor, ensuring that the air conditioner can timely exit from the oil return operation state, avoiding excessive system pressure, and promoting the air conditioner to maintain effective operation, which is convenient for users to use.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an oil return control device comprising:
the air conditioner comprises a detection unit, a control unit and a control unit, wherein the detection unit is used for detecting whether the air conditioner enters an oil return operation state or not, wherein in the oil return operation state, the air conditioner operates in a cooling mode or a heating mode, and accumulated lubricating oil is returned to a compressor;
the acquisition unit is used for acquiring the operating frequency of the air conditioner during oil return if the air conditioner enters the oil return operating state;
and the control unit is used for controlling the oil return time of the air conditioner according to the running frequency during oil return and a preset oil return frequency threshold value, wherein the oil return time is the running time of the air conditioner in the oil return running state.
Compared with the prior art, the oil return control device and the oil return control method have the same beneficial effects, and are not repeated herein.
The third objective of the present invention is to provide an air conditioner, which utilizes the operation frequency during oil return and a preset oil return frequency threshold to determine the condition of oil return during operation of the air conditioner, so as to effectively control the operation duration of the oil return operation state, thereby ensuring normal recovery of engine oil of the compressor, ensuring that the air conditioner can timely exit from the oil return operation state, avoiding overlarge system pressure, promoting the air conditioner to maintain effective operation, and facilitating the use of users.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
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 oil return control method as described above.
Compared with the prior art, the air conditioner and the oil return control method have the same beneficial effects, and are not repeated herein.
A fourth objective of the present invention is to provide a computer-readable storage medium, which utilizes an operation frequency during oil return and a preset oil return frequency threshold to determine an oil return condition during operation of an air conditioner, so as to effectively control an operation duration of an oil return operation state, thereby ensuring normal recovery of engine oil of a compressor, ensuring that the air conditioner can timely exit from the oil return operation state, avoiding an excessive system pressure, promoting the air conditioner to maintain effective operation, and facilitating use of a user.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements an oil return control method as described above.
The beneficial effects of the computer readable storage medium and the oil return control method are the same as those of the prior art, and are not described herein again.
Drawings
Fig. 1 is a schematic flow chart of an oil return control method according to an embodiment of the present invention;
fig. 2 is a first schematic flow chart illustrating controlling oil return time according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating a second process for controlling oil return duration according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an oil return control device according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The compressor of the air conditioner needs lubricating oil lubrication during the operation process, otherwise the compressor can be burnt out due to abrasion and overheating, and therefore, in order to ensure the long-time effective operation of the air conditioner, the oil return operation is the indispensable operation in the air conditioner system. In the air conditioner system, after the compressor runs for a long time at low frequency, the situation that the lubricating oil cannot be recovered due to poor oil carrying capacity of the operation occurs, and at the moment, in order to avoid abrasion caused by long-time lack of the lubricating oil, special oil return operation is carried out to ensure that the lubricating oil accumulated in the system is returned to the compressor, so that the compressor can normally run in a lubricating mode.
Generally, the oil-return operation is to bring the lubricating oil into the compressor by a short time and high frequency operation, wherein the oil-return operation time is either too long or too short to be advantageous for the operation of the air conditioner system. When the air conditioner is in an oil return running state, if the oil return operation running time is too long, the system load is too high, so that the oil return efficiency is low, and the refrigerating and heating effects are poor; if the operation time of the oil return operation is too short, the whole oil return is insufficient, and the compressor still cannot perform effective normal lubrication operation, so that the reasonable operation time of the oil return operation is the key for ensuring the oil return effect. However, in the existing air conditioner technology, a fixed oil return operation running time is generally set, the requirement on the actual oil return running time under different running conditions is ignored, the situation that the oil return operation running time is too long or too short is likely to occur, and finally the whole running condition of the system is poor. Therefore, the research and development of the time length capable of accurately controlling the oil return operation state according to different operation conditions is a technical problem which needs to be solved urgently at present.
Fig. 1 is a schematic flow chart of an oil return control method according to an embodiment of the present invention, including steps S1 to S3, where:
in step S1, it is detected whether the air conditioner enters an oil return operation state in which the air conditioner is operated in the cooling mode or the heating mode and the accumulated lubricating oil is returned to the compressor. Therefore, the embodiment of the invention firstly effectively judges whether the air conditioner system is in the oil return running state or not so as to further carry out control operation, thereby improving the oil return effect.
Optionally, step S1 specifically includes: and if the air conditioner runs at the low-frequency within the preset detection duration, the air conditioner enters an oil return running state, wherein the low-frequency is smaller than the preset oil return frequency. Therefore, the condition that the oil return is insufficient when the air conditioner runs at the low frequency for a period of time is indicated, the air conditioner needs to enter the oil return running state to ensure the normal lubrication running of the compressor, and therefore whether the air conditioner is in the oil return running state can be judged by accurately detecting the low frequency running time of the air conditioner, and the follow-up control on the oil return time is facilitated.
In step S2, when the air conditioner enters the oil return operation state, the operation frequency of the air conditioner at the time of oil return is acquired. Therefore, the frequency can efficiently reflect the system operation condition, so that the embodiment of the invention effectively judges the actual operation condition of the air conditioner system by using the operation frequency during oil return.
In step S3, the oil return duration of the air conditioner is controlled according to the operation frequency during oil return and a preset oil return frequency threshold, where the oil return duration is the operation duration of the air conditioner in the oil return operation state. Therefore, the frequency can efficiently reflect the operation condition of the system, so that the invention can accurately judge the condition of the oil return of the air conditioner according to the operation frequency during the oil return and the preset oil return frequency threshold value, thereby judging the requirement of the system for the oil return time according to the actual operation condition, and effectively controlling the operation time of the oil return operation state, thereby ensuring the normal recovery of the engine oil of the compressor, ensuring the air conditioner to timely quit the oil return operation state, avoiding the overlarge pressure of the system, promoting the air conditioner to maintain the effective operation, and facilitating the use of users.
Optionally, step S3 specifically includes: and if the operation frequency during oil return is greater than or equal to the oil return frequency threshold value, the oil return time length is preset oil return time length. Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a first process for controlling oil return time according to an embodiment of the present invention, which includes steps S31 to S32, and the specific steps are as follows:
in step S31, it is determined whether the operation frequency at the time of oil return is greater than or equal to the oil return frequency threshold. When the running frequency is higher during oil return, the oil return effect is good.
In step S32, if the operation frequency during oil return is greater than or equal to the oil return frequency threshold, the oil return time length is the preset oil return time length. Therefore, when the operation frequency during oil return is greater than or equal to the oil return frequency threshold, the oil return condition is better but the system operation load is larger, so that the corresponding shorter preset oil return time is set, and the effectiveness of the system oil return operation is ensured.
The oil return frequency threshold is preferably 50HZ, and the preset oil return time is preferably 1min, so that the reasonable oil return frequency threshold and the preset oil return time are set for the better oil return condition, and the effectiveness of the oil return operation of the system is ensured.
Optionally, step S3 further includes: and if the operation frequency during oil return is less than the oil return frequency threshold, controlling the oil return duration of the air conditioner according to a frequency difference value, wherein the frequency difference value is the difference between the operation frequency during oil return and the oil return frequency threshold. Referring to fig. 3, fig. 3 is a schematic flow chart illustrating a second method for controlling oil return duration according to an embodiment of the present invention, which includes steps S33 to S34, and includes the following steps:
in step S33, it is determined whether or not the operation frequency at the time of oil return is less than the oil return frequency threshold. When the operation frequency during oil return is low, the oil return effect is not optimal, and the oil return time needs to be prolonged.
In step S34, if the operation frequency during oil return is less than the oil return frequency threshold, the oil return duration of the air conditioner is controlled according to a frequency difference, where the frequency difference is a difference between the operation frequency during oil return and the oil return frequency threshold. Therefore, after the oil return operation is carried out, if the system pressure is too high, such as the exhaust temperature/the temperature of the outer coil pipe is too high, the system executes frequency limiting (high-pressure protection), the operation frequency during oil return does not reach the oil return frequency threshold, the difference value between the actual oil return frequency and the oil return frequency threshold is recorded, the different oil return operation times are corresponded, the larger the frequency difference value is, the longer the oil return time is, so that the better oil return effect is achieved while the system high-pressure protection is avoided, and the service life of the compressor and the refrigerating and heating effects of the air conditioner are improved. When the operation frequency during oil return is smaller than the oil return frequency threshold, the oil return condition is general but the system operation load is smaller at the moment, but the degree of the oil return condition at the moment cannot be judged, so that a frequency difference value is set for further judgment, the actual condition of the system operation is further judged according to the operation frequency during oil return and the oil return frequency threshold, and the effectiveness of the system oil return operation is further ensured.
Optionally, the controlling the oil return time length of the air conditioner according to the frequency difference includes:
if the frequency difference is smaller than the first deviation threshold, the oil return time length is the sum of the preset oil return time length and the first compensation time length.
If the frequency difference value is larger, the oil return effect is poor, and the required oil return time is correspondingly longer. When the frequency difference is smaller than the first deviation threshold, the difference between the oil return condition and the ideal state is not large, so that the first compensation time length is increased on the basis of the preset oil return time length, and the effective operation of the oil return is ensured.
The first deviation threshold is preferably 5HZ, and the first compensation time length is preferably 30s, so that the reasonable first deviation threshold and the first compensation time length are set for the condition that the difference between the return oil and the ideal state is small, and the effectiveness of the return oil operation of the system is ensured.
Optionally, the controlling the oil return time length of the air conditioner according to the frequency difference further includes:
and if the frequency difference value is between a first intermediate threshold and a second intermediate threshold, the oil return time length is the sum of the preset oil return time length and the intermediate compensation time length, wherein the first intermediate threshold is smaller than the second intermediate threshold, the first intermediate threshold is greater than or equal to the first deviation threshold, and the first compensation time length is smaller than the intermediate compensation time length.
The frequency difference is divided into a plurality of intervals corresponding to different oil return effects, so that good oil return effects can be achieved under different frequencies, when the frequency difference value is between the first intermediate threshold value and the second intermediate threshold value, the difference of the oil return condition from an ideal state is shown, therefore, the intermediate compensation time length is increased on the basis of the preset oil return time length, and the effective operation of oil return is ensured.
Optionally, when the first intermediate threshold is a first deviation threshold and the second intermediate threshold is a second deviation threshold, the intermediate compensation duration is a second compensation duration;
when the first intermediate threshold is a second deviation threshold and the second intermediate threshold is a third deviation threshold, the intermediate compensation duration is a third compensation duration;
when the first intermediate threshold is a third deviation threshold and the second intermediate threshold is a fourth deviation threshold, the intermediate compensation duration is a fourth compensation duration;
the first deviation threshold is smaller than the second deviation threshold, the second deviation threshold is smaller than the third deviation threshold, the third deviation threshold is smaller than the fourth deviation threshold, the first compensation duration is smaller than the second compensation duration, the second compensation duration is smaller than the third compensation duration, and the third compensation duration is smaller than the fourth compensation duration.
The oil return time is controlled according to different frequency difference values by comparing the operating frequency during oil return with the oil return frequency threshold value in real time, wherein the first intermediate threshold value and the second intermediate threshold value have different values and correspond to different operating frequency ranges, and different intermediate compensation time lengths are set when the frequency difference values are in different operating frequency ranges, so that the oil return time length is effectively controlled according to the system frequency operating condition. Meanwhile, according to different values of the first intermediate threshold and the second intermediate threshold, low-frequency operation, intermediate-frequency operation and high-frequency operation ranges are divided, the time length of the frequency difference value falling into different ranges corresponding to different intermediate compensation is long, the larger the frequency difference value is, the longer the oil return time is, the better oil return effect can be achieved while the high-pressure protection of the system is avoided, the service life of the compressor is prolonged, and the refrigerating and heating effects of the air conditioner are improved.
The first deviation threshold is preferably 5HZ, the first compensation period is preferably 30s, the second deviation threshold is preferably 10HZ, the second compensation period is preferably 60s, the third deviation threshold is preferably 15HZ, the third compensation period is preferably 90s, the fourth deviation threshold is preferably 20HZ, and the fourth compensation period is preferably 120 s. Therefore, according to the principle that the larger the frequency difference value is, the longer the oil return time is, different reasonable deviation threshold values and compensation time lengths are set in different difference value ranges, and the effectiveness of system oil return operation is guaranteed.
In a specific embodiment of the present invention, the oil return frequency threshold is 50HZ, the preset oil return time period is 1min, the first deviation threshold is 5HZ, the first compensation time period is 30s, the second deviation threshold is 10HZ, the second compensation time period is 60s, the third deviation threshold is 15HZ, the third compensation time period is 90s, the fourth deviation threshold is 20HZ, and the fourth compensation time period is 120s, where:
when the operation frequency during oil return is greater than or equal to an oil return frequency threshold (50HZ), the oil return time length is a preset oil return time length (1 min);
when the operation frequency during oil return is smaller than the oil return frequency threshold (50HZ), controlling the oil return duration of the air conditioner according to the difference between the operation frequency during oil return and the oil return frequency threshold (50HZ), namely the frequency difference, and the method comprises the following steps:
when the frequency difference is smaller than a first deviation threshold (5HZ), the oil return time length is the sum of the preset oil return time length (1min) and the first compensation time length (30s), namely 90 s;
when the frequency difference value is between the first deviation threshold value (5HZ) and the second deviation threshold value (10HZ), the oil return time length is the sum of the preset oil return time length (1min) and the second compensation time length (60s), namely 120 s;
when the frequency difference value is between the second deviation threshold value (10HZ) and the third deviation threshold value (15HZ), the oil return time length is the sum of the preset oil return time length (1min) and the third compensation time length (90s), namely 150 s;
when the frequency difference is between the third deviation threshold (15HZ) and the fourth deviation threshold (20HZ), the oil return time period is the sum of the preset oil return time period (1min) and the fourth compensation time period (120s), namely 180 s.
By way of a specific numerical example, when the operating frequency during oil return is 32HZ, the oil return control method is as follows:
when the air conditioner is detected to enter the oil return running state to run, obtaining the running frequency (32HZ) during oil return;
judging the condition that the operation frequency (32HZ) during oil return is smaller than the oil return frequency threshold (50HZ) according to the operation frequency (32HZ) during oil return and the oil return frequency threshold (50HZ), and controlling the oil return time length of the air conditioner according to the difference between the operation frequency (32HZ) during oil return and the oil return frequency threshold (50HZ), namely the frequency difference;
at this time, the difference between the operating frequency (32HZ) and the oil return frequency threshold (50HZ) during oil return is 18HZ, that is, the frequency difference is 18HZ, and is between the third deviation threshold (15HZ) and the fourth deviation threshold (20HZ), so that the oil return time length is the sum of the preset oil return time length (1min) and the fourth compensation time length (120s), that is, 180 s.
By way of another specific numerical example, when the operation frequency during oil return is 42HZ, the oil return control method is as follows:
when the air conditioner is detected to enter the oil return running state to run, obtaining the running frequency (42HZ) during oil return;
judging the condition that the operation frequency (42HZ) during oil return is smaller than the oil return frequency threshold (50HZ) according to the operation frequency (42HZ) during oil return and the oil return frequency threshold (50HZ), and controlling the oil return time length of the air conditioner according to the difference between the operation frequency (42HZ) during oil return and the oil return frequency threshold (50HZ), namely the frequency difference;
at this time, the difference between the operation frequency (42HZ) and the oil return frequency threshold (50HZ) during oil return is 8HZ, that is, the frequency difference is 8HZ, and is between the first deviation threshold (5HZ) and the second deviation threshold (10HZ), so that the oil return time length is the sum of the preset oil return time length (1min) and the first compensation time length (30s), that is, 90 s.
According to the oil return control method provided by the invention, the condition of running oil return of the air conditioner is judged by utilizing the running frequency during oil return and the preset oil return frequency threshold, so that the running time of the oil return running state is effectively controlled, the normal recovery of engine oil of a compressor is ensured, the air conditioner can timely exit the oil return running state, the excessive pressure of a system is avoided, the effective running of the air conditioner is promoted, and the use of a user is facilitated.
Fig. 4 is a schematic structural diagram of an oil return control device 400 according to an embodiment of the present invention, including a detecting unit 401, an obtaining unit 402, and a control unit 403, where:
a detection unit 401 for detecting whether the air conditioner enters an oil return operation state, wherein in the oil return operation state, the air conditioner operates in a cooling mode or a heating mode, and returns the accumulated lubricating oil to the compressor;
an obtaining unit 402, configured to obtain an operation frequency of the air conditioner during oil return if the air conditioner enters an oil return operation state;
the control unit 403 is configured to control an oil return time length of the air conditioner according to the operation frequency during oil return and a preset oil return frequency threshold, where the oil return time length is an operation time length of the air conditioner in an oil return operation state.
According to the oil return control device provided by the invention, the condition of running oil return of the air conditioner is judged by utilizing the running frequency during oil return and the preset oil return frequency threshold value, so that the running time of the oil return running state is effectively controlled, the normal recovery of engine oil of a compressor is ensured, the air conditioner can timely exit the oil return running state, the excessive system pressure is avoided, the effective running of the air conditioner is promoted, and the use of a user is facilitated.
In another embodiment of the present invention, an air conditioner includes a computer readable storage medium storing a computer program and a processor, and when the computer program is read by the processor and executed, the oil return control method is implemented, and the condition of the air conditioner that the air conditioner operates to return oil is determined by using the operating frequency during oil return and a preset oil return frequency threshold, so as to effectively control the operation duration of the oil return operation state, thereby ensuring normal recovery of engine oil of the compressor, ensuring that the air conditioner can timely exit from the oil return operation state, avoiding excessive system pressure, promoting the air conditioner to maintain effective operation, and facilitating use of a user.
In another embodiment of the present invention, a computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the oil return control method as described above is implemented, and the operating frequency during oil return and a preset oil return frequency threshold are used to determine the condition of oil return during operation of the air conditioner, so as to effectively control the operation duration of the oil return operation state, thereby ensuring normal recovery of engine oil from the compressor, ensuring that the air conditioner can exit the oil return operation state in time, avoiding an excessive system pressure, promoting the air conditioner to maintain effective operation, and facilitating use of a user.
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 as defined in the appended claims.
Claims (10)
1. An oil return control method is characterized by comprising the following steps:
detecting whether the air conditioner enters an oil return operation state, wherein in the oil return operation state, the air conditioner operates in a cooling mode or a heating mode, and accumulated lubricating oil is returned to the compressor;
if the air conditioner enters the oil return running state, the running frequency of the air conditioner during oil return is obtained;
and controlling the oil return time of the air conditioner according to the running frequency during oil return and a preset oil return frequency threshold value, wherein the oil return time is the running time of the air conditioner in the oil return running state.
2. The oil return control method of claim 1, wherein the detecting whether the air conditioner enters the oil return operation state comprises:
and if the air conditioner runs at the low-frequency within the preset detection duration, the air conditioner enters the oil return running state, wherein the low-frequency is smaller than the preset oil return frequency.
3. The oil return control method according to claim 1, wherein the controlling an oil return time period of the air conditioner according to the operation frequency during oil return and a preset oil return frequency threshold value comprises:
and if the running frequency during oil return is greater than or equal to the oil return frequency threshold, the oil return time is preset oil return time.
4. The oil return control method according to claim 1, wherein the controlling an oil return time period of the air conditioner according to the operation frequency during oil return and a preset oil return frequency threshold value comprises:
and if the running frequency during oil return is less than the oil return frequency threshold, controlling the oil return time length of the air conditioner according to a frequency difference value, wherein the frequency difference value is the difference between the running frequency during oil return and the oil return frequency threshold.
5. The oil return control method according to claim 4, wherein the controlling the oil return time period of the air conditioner according to the frequency difference includes:
and if the frequency difference is smaller than a first deviation threshold, the oil return time length is the sum of a preset oil return time length and a first compensation time length.
6. The oil return control method according to claim 5, wherein the controlling the oil return time period of the air conditioner according to the frequency difference includes:
if the frequency difference value is between a first intermediate threshold and a second intermediate threshold, the oil return duration is the sum of the preset oil return duration and the intermediate compensation duration, wherein the first intermediate threshold is smaller than the second intermediate threshold, the first intermediate threshold is larger than or equal to the first deviation threshold, and the first compensation duration is smaller than the intermediate compensation duration.
7. The oil return control method of claim 6, wherein when the first intermediate threshold is the first deviation threshold and the second intermediate threshold is a second deviation threshold, the intermediate compensation duration is a second compensation duration;
when the first intermediate threshold is the second deviation threshold and the second intermediate threshold is a third deviation threshold, the intermediate compensation duration is a third compensation duration;
when the first intermediate threshold is the third deviation threshold and the second intermediate threshold is a fourth deviation threshold, the intermediate compensation duration is a fourth compensation duration;
wherein the first deviation threshold is smaller than the second deviation threshold, the second deviation threshold is smaller than the third deviation threshold, the third deviation threshold is smaller than the fourth deviation threshold, the first compensation duration is smaller than the second compensation duration, the second compensation duration is smaller than the third compensation duration, and the third compensation duration is smaller than the fourth compensation duration.
8. An oil return control device, characterized by comprising:
the air conditioner comprises a detection unit, a control unit and a control unit, wherein the detection unit is used for detecting whether the air conditioner enters an oil return operation state or not, wherein in the oil return operation state, the air conditioner operates in a cooling mode or a heating mode, and accumulated lubricating oil is returned to a compressor;
the acquisition unit is used for acquiring the operating frequency of the air conditioner during oil return if the air conditioner enters the oil return operating state;
and the control unit is used for controlling the oil return time of the air conditioner according to the running frequency during oil return and a preset oil return frequency threshold value, wherein the oil return time is the running time of the air conditioner in the oil return running state.
9. An air conditioner comprising 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 oil return control method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when read and executed by a processor, implements the oil return control method according to any one of claims 1 to 7.
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Application publication date: 20201127 |