CN111043709B - Method for detecting fluorine deficiency state of refrigerant - Google Patents
Method for detecting fluorine deficiency state of refrigerant Download PDFInfo
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- CN111043709B CN111043709B CN201911329994.0A CN201911329994A CN111043709B CN 111043709 B CN111043709 B CN 111043709B CN 201911329994 A CN201911329994 A CN 201911329994A CN 111043709 B CN111043709 B CN 111043709B
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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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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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
- F24F11/62—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
- F24F11/70—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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The application discloses a method for detecting a fluorine-deficient state of a refrigerant, which comprises the steps of obtaining a compressor winding temperature value and an exhaust temperature value, matching the compressor winding temperature value and the exhaust temperature value according to a prestored relation mapping table to obtain a corresponding energy efficiency coefficient, and comparing the energy efficiency coefficient with a preset fluorine threshold value to obtain a corresponding fluorine-deficient grade. The parameters included in the relational mapping table are air conditioner running frequency, winding temperature threshold, exhaust temperature threshold and energy efficiency coefficient values; the corresponding relation of the four parameters is uniquely determined. According to the method, the fluorine-deficient grade of the air conditioner refrigerant lacking fluorine is judged through the mapping relation table, and the fluorine-deficient state of the air conditioner is identified. And the opening degree of the electronic expansion valve is adjusted, so that the air conditioner is in a working state of lacking fluorine, and the loss of the air conditioner is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioner control methods, in particular to a method for detecting a fluorine-deficient state of a refrigerant.
Background
When a leakage point exists in the refrigerating system, the refrigerant leaks slowly, and the refrigerating system can experience no fluorine deficiency, a fluorine deficiency first level, a fluorine deficiency second level and the like. At the first level, the system capacity is lacking but may not affect the user's use, and when the second level is reached, the system cooling (heating) capacity is significantly reduced, which may significantly affect the user's use. How to detect the degree of missing fluorine is a problem which needs to be solved urgently. In the prior art, the temperature of a compressor winding is directly adopted to judge the fluorine-deficient state of a refrigerating system, but the judgment of the winding temperature is not accurate due to the winding temperature detection precision, the temperature fluctuation of the working environment of the system and other reasons, so that the fluorine-deficient degree of the system cannot be accurately judged, and the influence on the working performance of the system cannot be directly judged. A
Therefore, whether the system has fluorine deficiency or not and whether the fluorine deficiency degree influences the working performance of the system or not is accurately judged, and the technical problem faced by the application is solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for detecting the fluorine-deficient state of a refrigerant, which solves the detection problem of an air-conditioning refrigerator. In order to achieve the purpose, the invention adopts the following technical scheme: the method for detecting the fluorine deficiency state of the refrigerant comprises the following steps:
after the compressor winding temperature value and the exhaust temperature value are obtained, the compressor winding temperature value and the exhaust temperature value are matched according to a prestored relation mapping table to obtain a corresponding energy efficiency coefficient, and the energy efficiency coefficient is compared with a preset fluorine threshold value to obtain a corresponding fluorine-lacking grade.
Further, the fluorine threshold value comprises a weak fluorine-lacking threshold value, when the energy efficiency coefficient belongs to the weak fluorine-lacking threshold value, the energy efficiency coefficient belongs to a weak fluorine-lacking grade, and the opening degree of the electronic expansion valve is adjusted until the temperature value of the compressor winding is detected to be smaller than the lowest temperature in the winding temperature threshold values corresponding to the weak fluorine-lacking threshold value.
Further, the method of adjusting the opening degree of the electronic expansion valve is,
s1, after the opening degree R of the electronic expansion valve is increased, the running time T of the air conditioner is controlled, and then the temperature T1 of a compressor winding is detected;
s2, comparing the detected compressor winding temperature T1 with the highest temperature T2 in winding temperature thresholds corresponding to the weak fluorine-lacking threshold;
s3, when T1 is less than T2, keeping the opening degree R of the electronic expansion valve; stopping when the opening R is the maximum opening, and sending alarm information;
and S4, when the T1 is more than or equal to the T2, circulating S1 and S2 after the opening degree is R-delta R. The opening degree of the electronic expansion valve is increased, and the circulation is carried out until the electronic expansion valve is fully opened; the opening degree is adjusted, and the adjusting precision is improved.
Further, the fluorine threshold value comprises a severe fluorine-lacking threshold value, when the energy efficiency coefficient belongs to the severe fluorine-lacking threshold value, the energy efficiency coefficient belongs to a severe fluorine grade, and the air conditioner controller simultaneously pushes alarm information and maintenance information to the after-sales maintenance system and the user receiving interface.
Further, when the energy efficiency coefficient belongs to the weak fluorine-lacking threshold value, the air conditioner controller pushes the weak fluorine-lacking grade information to a user mobile phone or an indoor machine display device or an after-sale maintenance system through a data transmission system.
Further, the preset fluorine threshold comprises a weak fluorine-lacking threshold and a serious fluorine-lacking threshold, and the weak fluorine-lacking threshold is 0.85-1.0 times of the highest energy efficiency coefficient; the critical fluorine deficiency threshold is 0.5-0.85 times of the highest energy efficiency coefficient.
Further, the parameters included in the relational mapping table are air conditioner running frequency, winding temperature threshold, exhaust temperature threshold and energy efficiency coefficient values; the corresponding relation of the four parameters is uniquely determined.
Compared with the prior art, the invention has the following beneficial effects:
according to the method and the device, the fluorine-lacking grade of the air-conditioning refrigerant lacking fluorine is directly judged through the energy efficiency coefficient mapping relation table, and the influence of the fluorine-lacking state of the air conditioner on the working performance of the air-conditioning system is identified. And the opening degree of the electronic expansion valve is adjusted, so that the air conditioner is in a working state of lacking fluorine, and the loss of the air conditioner is reduced.
Detailed Description
Example 1
The method for detecting the fluorine deficiency state of the refrigerant comprises the following steps:
after the compressor winding temperature value and the exhaust temperature value are obtained, the compressor winding temperature value and the exhaust temperature value are matched according to a prestored relation mapping table to obtain a corresponding energy efficiency coefficient, and the energy efficiency coefficient is compared with a preset fluorine threshold value to obtain a corresponding fluorine-lacking grade. The parameters included in the relational mapping table are air conditioner running frequency, winding temperature threshold, exhaust temperature threshold and energy efficiency coefficient values; the corresponding relation of the four parameters is uniquely determined.
The method for constructing the relational mapping table comprises the following steps:
before the air conditioner leaves a factory, the air conditioner is enabled to operate in different states of outdoor environment temperature, compressor frequency and charging amount in a standard commercial inspection room, the temperature of a compressor winding and an exhaust temperature value of the air conditioner and the temperature difference value of the compressor winding and the exhaust temperature value are recorded, system energy efficiency coefficients corresponding to the states are measured, and a corresponding table of the charging amount and the energy efficiency coefficients, the compressor winding temperature and the exhaust temperature value of the air conditioner in the specific states of the outdoor environment temperature and the compressor frequency is established.
For the same batch of air-conditioning outdoor units, 1% of air-conditioning outdoor units can be selected for laboratory data measurement:
refrigerant charging is carried out on the outdoor unit of the air conditioner according to 100%, 90% and 80% … … 50% of the nominal refrigerant charging amount;
after the filling is finished, the materials enter a laboratory in sequence, and the simulated outdoor environment temperature is set to be-30 ℃ to 10 ℃ and 25 ℃ to 40 ℃ respectively;
connecting an air conditioner outdoor unit to a standard air conditioner indoor unit in a standard room;
electrifying the air conditioner, adjusting the frequency of the compressor to the value of the frequency range of the common compressor, such as 80Hz in 30-130 Hz, operating the outdoor unit of the air conditioner for a period of time until the average temperature in the standard room is reduced by 1 degree, and recording the corresponding generated power consumption; and recording the temperature of the compressor winding and the exhaust temperature value in the process, and calculating an energy efficiency coefficient which is the refrigerating capacity/power consumption.
And recording the following data, namely the air conditioner operation frequency, the winding temperature threshold value, the exhaust temperature threshold value and the corresponding table of the energy efficiency coefficient value in the electrifying operation process of the air conditioner. As in table 1 below:
TABLE 1
It can be found from the observation results that as the refrigerant charge amount decreases, the energy efficiency coefficient of the compressor operating at the same compressor frequency decreases at the same outdoor ambient temperature, the combustion group temperature and the exhaust temperature of the compressor also increase in different trends, and the difference between the winding temperature increase rate and the exhaust temperature increase rate becomes larger and larger as the charge amount deviates from the standard value.
The winding temperature variation range and the exhaust temperature variation range corresponding to the fluorine-deficient state can be obtained by taking the highest value of the energy efficiency coefficient measured in the laboratory as a reference; in the actual work of the air conditioner, when the fluorine deficiency state of the air conditioner needs to be detected, the air conditioner is enabled to operate for the standard time at the set compressor frequency, the variation range of the exhaust temperature value and the variation range of the winding temperature value are detected simultaneously, and if the variation range of the exhaust temperature value and the variation range of the winding temperature value are both in the variation range corresponding to the fluorine deficiency state, the fluorine deficiency state is judged to be the fluorine deficiency state
And the fluorine threshold value comprises a weak fluorine-lacking threshold value, when the energy efficiency coefficient belongs to the weak fluorine-lacking threshold value, the energy efficiency coefficient belongs to a weak fluorine-lacking grade, and the opening degree of the electronic expansion valve is adjusted until the temperature value of the compressor winding is detected to be lower than the lowest temperature in the winding temperature threshold values corresponding to the weak fluorine-lacking threshold value.
Further, the method of adjusting the opening degree of the electronic expansion valve is,
s1, after the opening degree R of the electronic expansion valve is increased, the running time T of the air conditioner is controlled, and then the temperature T1 of a compressor winding is detected; so as to reduce the winding temperature and the exhaust temperature and prevent overheating;
s2, comparing the detected compressor winding temperature T1 with the highest temperature T2 in winding temperature thresholds corresponding to the weak fluorine-lacking threshold;
s3, when T1 is less than T2, keeping the opening degree R of the electronic expansion valve; stopping when the opening R is the maximum opening, and sending alarm information; the alarm information includes that after-sale maintenance determines the installation position according to the delivered air conditioner identification code.
And S4, when the T1 is more than or equal to the T2, circulating S1 and S2 after the opening degree is R-delta R.
The fluorine threshold value comprises a serious fluorine-lacking threshold value, when the energy efficiency coefficient belongs to the serious fluorine-lacking threshold value, the energy efficiency coefficient belongs to a serious fluorine-lacking grade, and the air conditioner controller simultaneously pushes alarm information and maintenance information to an after-sales maintenance system and a user receiving interface.
And when the energy efficiency coefficient belongs to the weak fluorine-lacking threshold value, the air conditioner controller pushes the weak fluorine-lacking grade information to a user mobile phone or an indoor unit display device or an after-sales maintenance system through a data transmission system. Energy efficiency coefficient measurement: the outdoor and indoor working environment temperatures are set in a laboratory, the air conditioner works at a certain compressor frequency, the average temperature in a room with a standard size is reduced by 1 degree, and the correspondingly generated energy consumption efficiency coefficient is recorded as cooling capacity/power consumption. The preset fluorine threshold value comprises a weak fluorine-lacking threshold value and a serious fluorine-lacking threshold value, and the weak fluorine-lacking threshold value is 0.85-1.0 times of the highest energy efficiency coefficient; the critical fluorine deficiency threshold is 0.5-0.85 times of the highest energy efficiency coefficient.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The method for detecting the fluorine deficiency state of the refrigerant is characterized by comprising the following steps of:
when the fluorine deficiency state of the air conditioner needs to be detected, the air conditioner is enabled to operate for a standard time at a set compressor frequency, after a compressor winding temperature value and an exhaust temperature value are obtained, the air conditioner operating frequency, the compressor winding temperature value and the exhaust temperature value are matched according to a prestored relation mapping table to obtain a corresponding energy efficiency coefficient, and the energy efficiency coefficient is compared with a preset fluorine threshold value to obtain a corresponding fluorine deficiency grade.
2. The method as claimed in claim 1, wherein the fluorine threshold comprises a fluorine deficiency threshold, and when the energy efficiency coefficient belongs to the fluorine deficiency threshold, the opening degree of the electronic expansion valve is adjusted until the compressor winding temperature value is detected to be lower than the lowest temperature of the winding temperature thresholds corresponding to the fluorine deficiency threshold.
3. The method for detecting a fluorine deficient state of a refrigerant according to claim 2, wherein the opening degree of the electronic expansion valve is adjusted by,
s1, after the opening degree R of the electronic expansion valve is increased, the running time T of the air conditioner is controlled, and then the temperature T1 of a compressor winding is detected;
s2, comparing the detected compressor winding temperature T1 with the highest temperature T2 in winding temperature thresholds corresponding to the weak fluorine-lacking threshold;
s3, when T1 is less than T2, keeping the opening degree R of the electronic expansion valve; stopping when the opening R is the maximum opening, and sending alarm information;
and S4, when the T1 is more than or equal to the T2, circulating S1 and S2 after the opening degree is R-delta R.
4. The method of claim 1, wherein the fluorine threshold comprises a severe fluorine-deficient threshold, and when the energy efficiency coefficient belongs to the severe fluorine-deficient threshold, the severe fluorine-deficient level is assigned, and the air conditioner controller simultaneously pushes alarm information and maintenance information to the after-market maintenance system and the user receiving interface.
5. The method for detecting the fluorine deficiency state of the refrigerant according to claim 2, wherein when the energy efficiency coefficient belongs to the fluorine deficiency threshold, the air conditioner controller pushes the fluorine deficiency grade information to a user mobile phone or an indoor machine display device or an after-sales service system through a data transmission system.
6. The method for detecting the fluorine deficiency state of the refrigerant according to any one of claims 1 to 5, wherein the preset fluorine threshold values include a fluorine deficiency threshold value and a fluorine deficiency threshold value, and the fluorine deficiency threshold value is 0.85 times to 1.0 times of the highest energy efficiency coefficient; the critical fluorine deficiency threshold is 0.5-0.85 times of the highest energy efficiency coefficient.
7. The method for detecting a fluorine deficiency state of a refrigerant according to any one of claims 1 to 5, wherein the parameters included in the map are an air conditioner operation frequency, a winding temperature threshold value, an exhaust temperature threshold value and an energy efficiency coefficient value; the corresponding relation of the four parameters is uniquely determined.
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| CN111928448A (en) * | 2020-07-20 | 2020-11-13 | 四川虹美智能科技有限公司 | Refrigerant leakage dual-mode judgment method and device |
| CN112503813B (en) * | 2020-12-04 | 2022-03-18 | 珠海格力电器股份有限公司 | Method and device for replacing air conditioner refrigerant |
| CN114992805B (en) * | 2022-05-31 | 2023-06-09 | 珠海格力电器股份有限公司 | Air conditioner performance matching method and device, electronic equipment and air conditioner |
| CN115111710A (en) * | 2022-06-23 | 2022-09-27 | 北京小米移动软件有限公司 | Air conditioner control method, device, medium and chip |
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| JPH0195255A (en) * | 1987-10-05 | 1989-04-13 | Sanyo Electric Co Ltd | Protective system of air conditioner |
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| JP2016090177A (en) * | 2014-11-07 | 2016-05-23 | 東芝キヤリア株式会社 | Refrigeration cycle device |
| CN106288196B (en) * | 2016-08-17 | 2018-11-23 | 珠海格力电器股份有限公司 | A kind of air-conditioning lacks control device, control method and the air-conditioning system of refrigerant protection |
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| CN107504732B (en) * | 2017-08-31 | 2020-04-28 | 四川长虹电器股份有限公司 | Method and device for judging quantity of refrigerant in refrigeration system |
| CN107631527B (en) * | 2017-09-04 | 2023-12-22 | 四川长虹空调有限公司 | Method and system for detecting whether variable-frequency refrigeration equipment lacks refrigerant |
| CN109631228B (en) * | 2019-01-31 | 2020-07-28 | 四川长虹空调有限公司 | Method and system for judging rapid leakage of refrigerant of refrigeration system |
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