CN113776175B - 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 PDFInfo
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- CN113776175B CN113776175B CN202111112351.8A CN202111112351A CN113776175B CN 113776175 B CN113776175 B CN 113776175B CN 202111112351 A CN202111112351 A CN 202111112351A CN 113776175 B CN113776175 B CN 113776175B
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The application discloses a control method of an air conditioner, which comprises the steps of obtaining the oil temperature superheat degree of a compressor of the air conditioner when the air conditioner is in a starting state; if the oil temperature superheat degree of the compressor is smaller than a set superheat degree threshold value, acquiring the running frequency of the compressor; and if the operating frequency is in the highest set frequency range of the compressor, reducing the current gear of the condenser fan of the air conditioner. The control method and device for the air conditioner, the air conditioner and the storage medium disclosed by the application can improve the oil return efficiency aiming at different running conditions of the air conditioner and reduce the probability of oil shortage running of the compressor.
Description
Technical Field
The present application relates to the field of air conditioner control technologies, and in particular, to a control method and apparatus for an air conditioner, and a storage medium.
Background
Along with the improvement of the living standard of people, the air conditioner becomes a household common electrical appliance, and the current temperature is more suitable by adjusting the temperature because the air conditioner can be used for temperature adjustment, so that the user experience can be effectively improved.
In the related art, the refrigerator oil of the compressor has the functions of lubrication, cooling and sealing, the pump body component is in clearance fit in a micron level, the pump body component can move at a high speed through oil film lubrication, the running surface of the compressor is worn due to the fact that the oil shortage of the compressor is caused, in order to detect the running state of the oil shortage of the compressor, the oil return quantity of an air suction port of the compressor is controlled, so that the running probability of the oil shortage of the compressor is reduced, specific reasons of the oil shortage of the compressor are different, various oil shortage conditions are caused, only the oil shortage is detected, corresponding treatment is not carried out according to the oil shortage condition, the treatment means is not specific, the oil return quantity is low, and the subsequent continuous occurrence of the running probability of the oil shortage of the compressor is high.
Disclosure of Invention
The embodiment of the application provides a control method and device of an air conditioner, the air conditioner and a storage medium, which can effectively identify whether a compressor is in the oil shortage condition with low oil temperature superheat degree and high oil discharge rate, provide a processing means pertinently, effectively improve oil return efficiency and reduce the probability of oil shortage operation of a subsequent compressor.
An embodiment of the present application provides a method for controlling an air conditioner, including:
acquiring the oil temperature superheat degree of a compressor of the air conditioner when the air conditioner is in a starting state;
if the oil temperature superheat degree is smaller than a set superheat degree threshold value, acquiring the running frequency of the compressor;
and if the operating frequency is in the highest set frequency range of the compressor, reducing the current gear of the condenser fan of the air conditioner.
Optionally, the obtaining the oil temperature superheat degree of the compressor of the air conditioner includes:
acquiring the current oil level of a compressor of the air conditioner; and if the current oil level is smaller than the set oil level, acquiring the oil temperature superheat degree of the compressor.
Optionally, after obtaining the current oil level of the compressor of the air conditioner and before the current oil level is smaller than the set oil level, the method further includes:
and judging whether the current oil level height is smaller than the set oil level height.
Optionally, after determining whether the current oil level is less than the set oil level, the method further includes:
if the current oil level height is not smaller than the set oil level height, acquiring the engine oil kinematic viscosity of the compressor;
and if the engine oil kinematic viscosity is smaller than the set viscosity, starting an electric heating belt of the air conditioner to heat the refrigerant of the compressor.
Optionally, after determining whether the current oil level is less than the set oil level and before the oil temperature superheat of the compressor is less than a set superheat threshold, the method further includes:
if the current oil level height is smaller than the set oil level height, acquiring the current oil pool temperature and the current exhaust pressure of the compressor;
acquiring the oil temperature superheat degree according to the current oil pool temperature and the current exhaust pressure;
and judging whether the oil temperature superheat degree is smaller than the set superheat degree threshold value.
Optionally, after determining whether the oil temperature superheat is less than the set superheat threshold, the method further includes:
if the oil temperature superheat degree is not less than the set superheat degree threshold value, acquiring the current exhaust temperature of the compressor;
if the current exhaust temperature is smaller than the set exhaust temperature, the operation frequency of the compressor is increased;
and if the current exhaust temperature is greater than or equal to the set exhaust temperature, controlling the compressor to stop and alarming.
Optionally, after acquiring the operating frequency of the compressor and before reducing the current gear of the condenser fan of the air conditioner, the method further includes:
and judging whether the operating frequency is in the highest set frequency range.
Optionally, after determining whether the operating frequency is within the highest set frequency range, the method further includes:
and if the operating frequency is not in the highest set frequency range of the compressor, increasing the operating frequency of the compressor.
A second aspect of the present application provides a control device of an air conditioner, comprising:
the oil level superheat degree acquisition unit is used for acquiring the oil temperature superheat degree of a compressor of the air conditioner when the air conditioner is in a starting state;
an operation frequency obtaining unit, configured to obtain an operation frequency of the compressor if the oil temperature superheat degree of the compressor is less than a set superheat degree threshold;
and the control unit is used for reducing the current gear of the condenser fan of the air conditioner if the running frequency is in the highest set frequency range of the compressor.
A third aspect of the present application provides an air conditioner, including an air conditioner body, a memory and a compressor provided in the air conditioner body, and one or more programs, wherein the one or more programs are stored in the memory, and are configured to be executed by one or more processors, and the one or more programs include operation instructions for performing the operation instructions corresponding to the control method of the air conditioner as provided in the first aspect.
A fourth aspect of the present application provides a computer-readable storage medium having stored thereon a computer program, characterized in that the program, when executed by a processor, implements the steps corresponding to the control method of an air conditioner as provided in the first aspect.
The above-mentioned one or at least one technical scheme in the embodiment of the application has at least the following technical effects:
based on the technical scheme, when the air conditioner is in a starting state, judging whether the overheat degree of the oil temperature of the compressor is smaller than a set overheat degree threshold value, if so, judging that the overheat degree of the oil temperature is low and the oil discharge rate is high, and then judging that the running frequency is not in the highest set frequency range of the compressor, and increasing the running frequency of the compressor; when the running frequency of the compressor is in the highest set frequency range of the compressor, the air conditioner can be determined to be under the overload working condition, at the moment, the current gear of the condenser fan of the air conditioner is reduced, the current rotating speed of the condenser fan is reduced to the set rotating speed, the exhaust pressure can be effectively improved, the solubility of the refrigerant in the refrigerating machine oil of the compressor can be effectively improved on the basis of improving the exhaust pressure, the condition that the refrigerant is rapidly evaporated and foamed to take away a large amount of refrigerating machine oil is further reduced, and therefore the probability of the oil shortage running of the compressor can be effectively reduced, the probability of abrasion caused by the oil shortage running of the compressor is also reduced accordingly, and the service life of the compressor can be effectively prolonged.
In addition, by combining and analyzing the parameters of the compressor such as the oil temperature height, the oil temperature superheat degree, the exhaust temperature, the engine oil kinematic viscosity and the like, the application can effectively identify the specific condition of oil shortage (overload, low-frequency oil shortage, high oil discharge rate of low oil temperature superheat degree and low-temperature low oil viscosity) and provide a targeted solving measure, thereby ensuring the oil return efficiency and reducing the probability of continuous occurrence of the oil shortage operation of the compressor.
Drawings
Fig. 1 is a flow chart of a control method of an air conditioner according to an embodiment of the present application;
fig. 2a is a diagram of a judging process step for a low oil temperature overheat condition with a high oil discharge rate according to an embodiment of the present application;
FIG. 2b is a diagram of steps for determining a low-frequency oil shortage situation according to an embodiment of the present application;
FIG. 2c is a diagram of steps for determining overload conditions according to an embodiment of the present application;
FIG. 2d is a diagram showing the steps of the low-temperature and low-oil viscosity determination process according to the embodiment of the present application;
fig. 3 is a block diagram of a control device of an air conditioner according to an embodiment of the present application.
Detailed Description
The main implementation principle, the specific implementation manner and the corresponding beneficial effects of the technical scheme of the embodiment of the application are described in detail below with reference to the accompanying drawings.
Examples
Referring to fig. 1, an embodiment of the present application provides a control method of an air conditioner, including:
s101, acquiring the oil temperature superheat degree of a compressor of an air conditioner when the air conditioner is in a starting state;
s102, if the oil temperature superheat degree of the compressor is smaller than a set superheat degree threshold value, acquiring the running frequency of the compressor;
and S103, if the operating frequency is in the highest set frequency range of the compressor, reducing the current gear of the condenser fan of the air conditioner. And reducing the current rotating speed of the condenser fan to a set rotating speed.
In the embodiment of the present specification, the air conditioner may be a refrigeration air conditioner, a heating air conditioner, a cooling and heating air conditioner, or the like.
In step S101, a current oil level of a compressor of the air conditioner may be acquired; if the current oil level is smaller than the set oil level, judging whether the oil temperature superheat degree of the compressor is smaller than the set superheat degree threshold value. In particular, the current oil level of the compressor in a set time after start-up can be obtained. For example, after the air conditioner is started, the starting time of the air conditioner may be counted by a timer, and when t seconds(s) of operation are performed, the current oil level of the compressor is obtained by an oil level sensor, which may be, for example, a position sensor or an image pickup sensor.
In the embodiment of the specification, the setting time, i.e. t, can be set by a person or an air conditioner by itself, and can be set according to actual demands, and the value range of t can be, for example, 3-5 minutes (min), 1-4min, 4-7min, and the like. Preferably, the superheat threshold is set to 3-5min.
After the current oil level is obtained, before executing step S102, it is further required to determine whether the current oil level is less than a set oil level, and determine whether the superheat degree of the oil temperature is less than a set superheat degree threshold, and execute step S102 if it is determined that the current oil level is less than the set oil level, and the superheat degree of the oil temperature of the compressor is less than the set superheat degree threshold.
In the specific implementation process, after judging whether the current oil level is smaller than the set oil level, if so, acquiring the current oil pool temperature and the current exhaust pressure of the compressor; acquiring the superheat degree of the oil temperature according to the current oil pool temperature and the current exhaust pressure; then judging whether the superheat degree of the oil temperature is smaller than a set superheat degree threshold value or not; if it is determined whether the oil temperature superheat degree is smaller than the set superheat degree threshold, step S102 is performed.
In the embodiment of the present specification, the set oil level is determined according to the minimum oil level required by the design of the compressor, at this time, the set oil level may also be the minimum oil level, a value range may also be determined according to the minimum oil level, the minimum oil level in the value range is located at an intermediate position, for example, the minimum oil level H1 is represented, and the value range may be [ h1+h2, H1-H2], where H2 may be set according to the actual situation, for example, may be 10 millimeters (mm), 20mm, 50mm, etc., and after the value range is determined, a value may be randomly selected from the value range as the set oil level, or the value range may be directly used as the set oil level.
Specifically, after the current oil sump temperature and the current exhaust pressure of the compressor are obtained, when the oil temperature superheat degree is obtained according to the current oil sump temperature and the current exhaust pressure, the saturated temperature corresponding to the current exhaust pressure can be searched from a preset pressure saturated temperature comparison table, and the oil temperature superheat degree is obtained according to the current oil sump temperature and the searched saturated temperature.
Specifically, the first difference value between the current oil pool temperature and the found saturation temperature may be obtained as the oil temperature superheat degree, or the product of the first difference value and a corresponding first weight may be used as the oil temperature superheat degree after the first difference value is obtained, where the first weight may be set by a person or an air conditioner, may be set according to an actual requirement, and may be, for example, 0.9, 0.98, 0.85, and the like.
In this way, after the oil temperature superheat degree is obtained, it is determined whether it is smaller than the set superheat degree threshold, and if so, step S102 is performed.
In the embodiment of the specification, the set superheat threshold value can be set manually or by an air conditioner, and can be set according to actual requirements, and the range of the set superheat threshold value can be, for example, 0-5 ℃,1-4 ℃, 0-6 ℃ and the like. Preferably, the superheat threshold is set at 0-5 ℃.
In step S102, the operating frequency of the compressor may be acquired by a frequency tester, which may be, for example, a multimeter, a vibration sensor, or the like.
Specifically, after judging that the current oil level is less than the set oil level, triggering and judging whether the oil temperature superheat degree is less than the set superheat degree threshold value or not, if yes, determining that the compressor is in the condition of low oil temperature superheat degree and high oil discharge rate, at this time, judging the actual working condition of the compressor through the operation frequency by acquiring the operation frequency, wherein the actual working condition comprises a low-frequency operation working condition and an overload working condition, reducing the oil discharge rate by adopting corresponding operation according to the actual working condition of the compressor so as to improve the oil level of the compressor, effectively improving the oil return efficiency on the basis of improving the oil level of the compressor, reducing the probability of oil shortage operation of the compressor, and reducing the probability of abrasion caused by the oil shortage operation of the compressor so as to effectively improve the service life of the compressor.
After the operation frequency of the compressor is obtained and before step S103 is performed, it is further determined whether the operation frequency is within the highest set frequency range; if it is determined that the operating frequency is within the highest set frequency range, step S103 is executed; if the operation frequency is determined not to be within the highest set frequency range of the compressor, the operation frequency of the compressor is increased.
The current gear of the condenser fan of the air conditioner is reduced, and the current rotating speed of the condenser fan is reduced to the set rotating speed.
In practice, when the air conditioner is operated in certain environments (e.g., low temperature environments), refrigerant may be dissolved in the compressor refrigerator oil. In the starting stage of the air conditioner, if the running air quantity of the fan of the air conditioner is large, particularly if the fan comprises a plurality of fan units and the fan units run simultaneously, the exhaust pressure of the air conditioner can be greatly reduced, so that the solubility of the refrigerant in the refrigerating machine oil of the compressor can be reduced, the refrigerant is rapidly evaporated and foamed, a large amount of refrigerant and machine oil are taken away, the risk of oil shortage of the compressor is caused, and the running reliability of the compressor is affected.
In step S103, when it is determined that the operating frequency is within the highest set frequency range, it may be determined that the actual working condition of the compressor is an overload working condition, and at this time, the exhaust pressure may be increased by reducing the current gear of the condenser fan of the air conditioner and reducing the current rotation speed of the condenser fan to the set rotation speed.
In this embodiment of the present disclosure, the set rotation speed may be the lowest rotation speed or the second lowest rotation speed or the third lowest rotation speed of the fan, and by reducing the current rotation speed of the fan, the probability of reducing the exhaust pressure by the rotation speed of the fan is reduced. Further, when the current gear of the condenser fan is reduced, the number of the reduced gears can be determined according to actual conditions, and if the current gear is higher, the number of the reduced gears can be larger at the moment; if the current gear is lower, the number of the reduced gears may be smaller, for example, the gears of the condenser are sequentially 1, 2, 3, 4 and 5 from high to low, if the current gear is 1 gear, the number of the reduced gears may be 2 or 3, and if the number of the reduced gears is 2, the actual gear after the current gear of the condenser fan is reduced to 3 gears; if the current gear is 3, the number of the downshifts may be 1 or 1, and if the number of the downshifts is 1, the actual gear after the current gear of the condenser fan is reduced is 4.
Specifically, after the current gear of the condenser fan is reduced, the condensing temperature of the condenser is increased, the condensing pressure is also increased under the condition that the condensing temperature is increased, the exhaust pressure corresponds to the condensing temperature, and the exhaust pressure is also increased on the basis that the condensing pressure is increased; and further through reducing the current rotational speed of fan to the settlement rotational speed, reduce the probability that causes the exhaust pressure to reduce the condition because the power of fan is too big, so, through the current gear of reducing the condenser fan of air conditioner to reduce the current rotational speed of condenser fan to the settlement rotational speed, can effectively improve exhaust pressure, on the basis that exhaust pressure improves, can effectively improve the solubility of refrigerant in the compressor refrigerating machine oil, and then reduce the probability that refrigerant evaporates the foaming rapidly and takes away disturbing refrigerant and machine oil, thereby can effectively reduce the probability that the compressor lacks the oil operation, make the compressor lacks the oil operation and lead to the probability that wearing and tearing also to reduce thereupon, thereby can effectively improve the life of compressor.
Correspondingly, if the operation frequency is not in the highest set frequency range of the compressor, the actual working condition of the compressor can be judged to be a low-frequency operation condition, and the exhaust pressure can be improved by improving the operation frequency of the compressor when the compressor is in the low-frequency operation condition; therefore, on the basis of improving the exhaust pressure, the solubility of the refrigerant in the compressor refrigerating machine oil can be effectively improved, the probability that the refrigerant is rapidly evaporated and foamed to take away the disturbing refrigerant and the machine oil is further reduced, the probability of the oil-shortage operation of the compressor can be effectively reduced, the probability of abrasion caused by the oil-shortage operation of the compressor is also reduced, and the service life of the compressor can be effectively prolonged.
In another embodiment of the present disclosure, after determining whether the current oil level is less than the set oil level, if it is determined that the current oil level is not less than the set oil level, the kinematic viscosity of the engine oil of the compressor is obtained; if the engine oil kinematic viscosity is smaller than the set viscosity, an electric heating belt of the air conditioner is started to heat the coolant of the compressor.
Specifically, the set viscosity can be set manually or by the air conditioner itself, and can be set according to actual requirements, and the set viscosity can be, for example, 0.03-0.5 centipoise (cp), 0.02-0.8cp,0.08-0.4cp,0.1-0.7cp, and the like. Preferably, the viscosity is set to 0.03-0.5cp.
Specifically, by comparing the engine oil kinematic viscosity with the set viscosity, it is further determined whether the engine oil kinematic viscosity is smaller than the set viscosity, and when it is determined that the engine oil kinematic viscosity is not smaller than the set viscosity, at this time, the probability that the oil residing in the oil-rich layer is rapidly discharged is small, and no operation may be performed. When the motor oil kinematic viscosity is judged to be smaller than the set viscosity, the motor oil kinematic viscosity is lower than the set viscosity and is located on the upper layer, at the moment, the motor oil kinematic viscosity is smaller than the set viscosity, so that the probability that the motor oil located on the oil-rich layer (namely the upper layer) can be discharged rapidly is higher, the oil level descending speed of the compressor is promoted to be improved, the probability that the compressor runs short of the oil is increased, and in order to reduce the probability that the compressor runs short of the oil, the electric heating belt heats an oil pool at the bottom of the compressor, excessive migration of the refrigerant is reduced, layering of the refrigerating motor oil and the refrigerant is reduced, and the refrigerating motor oil located above (the oil-rich layer) is discharged outside the compressor along with the refrigerant after the starting. Therefore, the probability of oil shortage operation of the compressor can be effectively reduced, the probability of abrasion caused by the oil shortage operation of the compressor is also reduced, and the service life of the compressor can be effectively prolonged.
In another embodiment of the present disclosure, after determining whether the oil temperature superheat degree is less than the set superheat degree threshold, if it is determined that the oil temperature superheat degree is not less than the set superheat degree threshold, the current discharge temperature of the compressor is obtained; and if the current exhaust temperature is smaller than the set exhaust temperature, increasing the operating frequency of the compressor.
Specifically, the set exhaust temperature can be set by a person or an air conditioner by itself, can be set according to actual requirements, and can be, for example, 80-95 ℃,75-97 ℃,85-92 ℃,86-96 ℃, and the like. Preferably, the exhaust temperature is set to 80-95 ℃.
Specifically, when judging that the superheat degree of the oil temperature is not less than the set superheat degree threshold value, judging whether the current exhaust temperature is less than the set exhaust temperature or not, if judging that the current exhaust temperature is less than the set exhaust temperature, determining that the oil level is lower than the set oil level at this time, and the current exhaust temperature is lower, at this time, increasing the operating frequency of the compressor so as to increase the exhaust pressure, so that on the basis of increasing the exhaust pressure, the solubility of the refrigerant in the refrigerating machine oil of the compressor can be effectively increased, and further, the condition that the refrigerant rapidly evaporates and foams to take away a large amount of refrigerating machine oil is reduced, thereby effectively reducing the probability of oil shortage operation of the compressor, leading to the reduction of the probability of abrasion caused by the oil shortage operation of the compressor, and effectively prolonging the service life of the compressor.
And when judging that the current exhaust temperature is not less than the set exhaust temperature, determining that the oil level is lower than the set oil level at the moment, and the current exhaust temperature is higher, wherein the probability that the compressor faces insufficient oil film thickness is higher, the probability that the compressor is caused to wear due to oil shortage operation is also higher, at the moment, the compressor can be controlled to stop, and alarm information is output, so that the probability that the compressor is increased due to continuous oil shortage operation. When the alarm information is output, the alarm information can be sent to the user terminal through a bell or generated alarm information so as to remind the user.
Referring to fig. 2a to 2d, various confirmation status judgment and processing step diagrams of the air conditioner according to the present embodiment are provided. Fig. 2a shows a low oil temperature overheat condition with a high oil discharge rate, fig. 2b shows a low frequency low oil condition, fig. 2c shows an overload oil condition, and fig. 2d shows a low temperature low oil viscosity condition. The following description will be made in detail with reference to 2a to 2 d: firstly, executing the step A1, starting the air conditioner, namely starting the air conditioner; after executing step A1, executing step A2, running for a set time t, at which time the time can be counted by a counter; step A3 is executed, and the current oil level height H0 of the compressor is obtained; after obtaining H0, executing step A4, and determining whether H0 is smaller than the set oil level H1; if the temperature is smaller than the set temperature, executing the step A50, acquiring the temperature of the oil pool and the exhaust pressure, and calculating the superheat delta T of the oil temperature; and if the viscosity is not smaller than the preset value, executing A60, and acquiring the engine oil kinematic viscosity V of the compressor.
After executing step a50, executing step a51, and determining whether Δt is smaller than a set superheat threshold T1; if the frequency is smaller than the preset value, executing the step A52, and acquiring the running frequency F of the compressor; after executing step a52, executing step a53 to determine whether F is within the highest set frequency range; if yes, executing the step A54, reducing the current gear of the condenser fan, and keeping the minimum rotation speed of the condenser fan to run; if not, step A55 is executed to increase the operating frequency of the compressor.
After step a51, if it is determined that Δt is not smaller than the set superheat threshold T1, step a70 is performed to obtain the discharge temperature T of the compressor p The method comprises the steps of carrying out a first treatment on the surface of the After step A70, step A71 is performed to determine T p Whether or not it is less than the set exhaust temperature T2; if yes, executing step A55; if not, executing the step A72, and immediately stopping the machine to give an alarm.
After executing the step a60, executing the step a61, judging whether V is not less than the set viscosity T3, and if not, executing the step a62, and operating the air conditioner normally; if the temperature is less than the preset temperature, the step A63 is executed, and the electric heating belt is opened to heat the coolant of the compressor.
Therefore, the current oil level height of the compressor is detected, various oil starvation scenes such as oil starvation caused by oil discharge (high oil discharge rate of low oil temperature superheat degree and low oil viscosity of low oil temperature superheat degree) caused by oil starvation caused by oil discharge, oil starvation caused by oil return caused by overload (low oil discharge temperature high oil level and insufficient oil film coverage) are detected, and corresponding oil return control strategies are set, so that the probability of oil starvation operation of the compressor can be effectively reduced, the probability of abrasion caused by oil starvation operation of the compressor is also reduced, and the service life of the compressor can be effectively prolonged.
Based on the technical scheme, when the air conditioner is in a starting state, if the current oil level of the compressor of the air conditioner is smaller than the set oil level and the oil temperature superheat degree of the compressor is smaller than the set superheat degree threshold, at the moment, the air conditioner belongs to the condition of low oil temperature superheat degree and high oil discharge rate, and then the running frequency is judged to be not in the highest set frequency range of the compressor, and the running frequency of the compressor is improved; when the running frequency of the compressor is in the highest set frequency range of the compressor, the air conditioner can be determined to be under the overload working condition, at the moment, the current gear of the condenser fan of the air conditioner is reduced, the current rotating speed of the condenser fan is reduced to the set rotating speed, the exhaust pressure can be effectively improved, the solubility of the refrigerant in the refrigerating machine oil of the compressor can be effectively improved on the basis of improving the exhaust pressure, the condition that the refrigerant is rapidly evaporated and foamed to take away a large amount of refrigerating machine oil is further reduced, and therefore the probability of the oil shortage running of the compressor can be effectively reduced, the probability of abrasion caused by the oil shortage running of the compressor is also reduced accordingly, and the service life of the compressor can be effectively prolonged.
In addition, by combining and analyzing the compressor parameters such as oil level height, oil temperature superheat degree, exhaust temperature, engine oil kinematic viscosity and the like, the application can effectively identify the specific condition of oil shortage (overload, low-frequency oil shortage, low oil temperature superheat degree, high oil discharge rate and low-temperature low oil viscosity) and provide a targeted solving measure, thereby ensuring oil return efficiency and reducing the probability of continuous occurrence of the oil shortage operation of the compressor.
With reference to fig. 3, the second aspect of the embodiment of the present application further provides a control device for an air conditioner, where the control device includes:
an oil temperature superheat obtaining unit 301, configured to obtain an oil temperature superheat of a compressor of an air conditioner when the air conditioner is in a start state;
an operation frequency obtaining unit 302, configured to obtain an operation frequency of the compressor if an oil temperature superheat degree of the compressor is less than a set superheat degree threshold;
and the control unit 303 is configured to reduce the current gear of the condenser fan of the air conditioner if the operating frequency is within the highest set frequency range of the compressor.
In an alternative embodiment, the method further comprises:
and the judging unit is used for judging whether the current oil level is smaller than the set oil level after the current oil level of the compressor of the air conditioner is acquired and before the current oil level is smaller than the set oil level.
In an alternative embodiment, the method further comprises:
a viscosity obtaining unit configured to obtain an engine oil kinematic viscosity of the compressor if the current oil level is not less than the set oil level after determining whether the current oil level is less than the set oil level;
and the control unit is used for starting an electric heating belt of the air conditioner to heat the coolant of the compressor if the engine oil kinematic viscosity is smaller than the set viscosity.
In an alternative embodiment, the method further comprises:
the oil temperature superheat degree obtaining unit is used for obtaining the current oil pool temperature and the current exhaust pressure of the compressor after judging whether the current oil level height is smaller than the set oil level height or not and before the oil temperature superheat degree of the compressor is smaller than a set superheat degree threshold value if the current oil level height is smaller than the set oil level height or not; acquiring the oil temperature superheat degree according to the current oil pool temperature and the current exhaust pressure;
and the judging unit is used for judging whether the superheat degree of the oil temperature is smaller than the set superheat degree threshold value.
In an alternative embodiment, the method further comprises:
the exhaust temperature acquisition unit is used for acquiring the current exhaust temperature of the compressor if the oil temperature superheat degree is not less than the set superheat degree threshold after judging whether the oil temperature superheat degree is less than the set superheat degree threshold;
the control unit is used for increasing the operation frequency of the compressor if the current exhaust temperature is smaller than the set exhaust temperature; and if the current exhaust temperature is greater than or equal to the set exhaust temperature, controlling the compressor to stop and alarming.
In an alternative embodiment, the determining unit is configured to determine whether the operating frequency is within the highest set frequency range after the operating frequency of the compressor is acquired and before the current gear of the condenser fan of the air conditioner is reduced.
In an alternative embodiment, the control unit is configured to increase the operating frequency of the compressor after determining whether the operating frequency is within the highest set frequency range, if the operating frequency is not within the highest set frequency range of the compressor.
In view of the foregoing embodiments, a third aspect of the present application provides an air conditioner, which includes an air conditioner body, a memory and a compressor disposed in the air conditioner body, and one or more programs, where the one or more programs are stored in the memory, and are configured to be executed by one or more processors, where the one or more programs include operation instructions for performing the operation instructions corresponding to the control method of the air conditioner.
In view of the foregoing, a fourth aspect of the present application provides a computer-readable storage medium, where a computer program is stored, where the program is executed by a processor to implement steps corresponding to the foregoing method for controlling an air conditioner.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.
Claims (9)
1. A control method of an air conditioner, the method comprising:
acquiring the current oil level of a compressor of the air conditioner when the air conditioner is in a starting state, and judging whether the current oil level is smaller than a set oil level;
if the current oil level is smaller than the set oil level, acquiring the current oil pool temperature and the current exhaust pressure of the compressor; acquiring the oil temperature superheat degree of the compressor according to the current oil pool temperature and the current exhaust pressure;
if the oil temperature superheat degree is smaller than a set superheat degree threshold value, acquiring the running frequency of the compressor;
and if the running frequency is in the highest set frequency range of the compressor, determining that the air conditioner is under the overload working condition, and reducing the current gear of the condenser fan of the air conditioner.
2. The method of claim 1, wherein after determining whether the current oil level is less than the set oil level, the method further comprises:
if the current oil level height is not smaller than the set oil level height, acquiring the engine oil kinematic viscosity of the compressor; and if the engine oil kinematic viscosity is smaller than the set viscosity, starting an electric heating belt of the air conditioner to heat the refrigerant of the compressor.
3. The method of claim 1, wherein after determining whether the current oil level is less than the set oil level and before the oil temperature superheat of the compressor is less than a set superheat threshold, the method further comprises:
if the current oil level height is smaller than the set oil level height, acquiring the current oil pool temperature and the current exhaust pressure of the compressor;
acquiring the oil temperature superheat degree according to the current oil pool temperature and the current exhaust pressure; judging
And whether the oil temperature superheat degree is smaller than the set superheat degree threshold value.
4. The method of claim 3, wherein after determining whether the oil temperature superheat is less than the set superheat threshold, the method further comprises:
if the oil temperature superheat degree is not less than the set superheat degree threshold value, acquiring the current exhaust temperature of the compressor; if the current exhaust temperature is smaller than the set exhaust temperature, the operation frequency of the compressor is increased;
and if the current exhaust temperature is greater than or equal to the set exhaust temperature, controlling the compressor to stop and alarming.
5. The method of any of claims 1-4, wherein after the operating frequency of the compressor is acquired and before the current gear of the condenser fan of the air conditioner is reduced, the method further comprises: judging
Whether the operating frequency is within the highest set frequency range.
6. The method of claim 5, wherein after determining whether the operating frequency is within the highest set frequency range, the method further comprises:
and if the operating frequency is not in the highest set frequency range of the compressor, increasing the operating frequency of the compressor.
7. A control device of an air conditioner, comprising:
the judging unit is used for acquiring the current oil level of the compressor of the air conditioner when the air conditioner is in a starting state and judging whether the current oil level is smaller than a set oil level or not;
the oil temperature superheat obtaining unit is used for obtaining the current oil pool temperature and the current exhaust pressure of the compressor if the current oil level height is smaller than the set oil level height; acquiring the oil temperature superheat degree of the compressor according to the current oil pool temperature and the current exhaust pressure;
an operation frequency obtaining unit, configured to obtain an operation frequency of the compressor if the oil temperature superheat degree of the compressor is less than a set superheat degree threshold;
and the control unit is used for reducing the current gear of the condenser fan of the air conditioner if the running frequency is in the highest set frequency range of the compressor and the air conditioner is determined to be under the overload working condition.
8. An air conditioner comprising an air conditioner body, a memory and a compressor provided in the air conditioner body, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by one or more processors, and the one or more programs include instructions for performing operations corresponding to the method of any one of claims 1-6.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, carries out the corresponding steps of the method according to any one of claims 1-6.
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