CN110645673B - Refrigerant shortage protection method for fixed-frequency air conditioner - Google Patents
Refrigerant shortage protection method for fixed-frequency air conditioner Download PDFInfo
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- CN110645673B CN110645673B CN201910980776.7A CN201910980776A CN110645673B CN 110645673 B CN110645673 B CN 110645673B CN 201910980776 A CN201910980776 A CN 201910980776A CN 110645673 B CN110645673 B CN 110645673B
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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
- F24F11/38—Failure diagnosis
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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
- F24F11/52—Indication arrangements, e.g. displays
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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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Abstract
The invention relates to a refrigerant shortage protection method for a fixed-frequency air conditioner, which comprises the following steps: 1) the air conditioner operates in a refrigerating mode, and the compressor is started; 2) detecting the middle temperature Ti of the indoor heat exchanger; detecting the return air temperature Th of the indoor unit; the air conditioner controller records the accumulated running time t of the compressor; 3) if Th-Ti is less than or equal to T2, the duration is more than or equal to T4, and turning to the step 8); otherwise, turning to the step 2); 4) if t is less than or equal to t5, turning to step 5); otherwise, turning to the step 2); 5) if (Th-Ti) max- (Th-Ti) min is not less than T1, turning to step 6); otherwise, turning to the step 2); 6) if tmin-tmax is more than 0 and less than or equal to t3, turning to step 7); otherwise, turning to the step 2); 7) if tmax is more than or equal to t1 and tmin is less than or equal to t2, turning to step 8); otherwise, turning to the step 2); 8) the air conditioner controller displays the fault, and the code is the refrigerant shortage protection; at the same time, the compressor is shut down. The invention judges the leakage degree of the air conditioner refrigerant by detecting the running time of the compressor, the temperature of the indoor heat exchanger coil, the indoor environment temperature and other parameters, and protects the compressor.
Description
Technical Field
The invention relates to an air conditioner control method, in particular to a control method of a fixed-frequency air conditioner, and specifically relates to a refrigerant shortage protection method of the fixed-frequency air conditioner.
Background
Because the fixed-frequency air conditioner is split type equipment, the pipeline connection is needed, the system refrigerant quantity is reduced due to the fact that the unit is adopted to empty the pipeline, and the pipeline connection position is leaked due to the fact that the installation technology is unqualified, and the system refrigerant quantity is reduced.
The existing fixed-frequency air conditioner has no equipment such as a low-pressure switch, an exhaust temperature sensor and the like which are commonly used for detecting whether the circulation of a refrigerant is normal or not due to cost consideration, and when the refrigerant quantity of the air conditioner is reduced to a certain degree, lubricating oil of a compressor loses a lubricating effect at high temperature and even is carbonized, so that cylinder parts of the compressor are abraded until the cylinder is clamped. Although a built-in protector is provided inside the compressor, the protection is triggered at high temperature or large current by detecting temperature and current. However, the recovery time of the mechanical part is long, which affects the use effect of the user. Therefore, there is a need for improvements in the prior art to increase the useful life of the compressor and improve the user experience.
Disclosure of Invention
The invention aims to provide a method for protecting a fixed-frequency air conditioner from lack of a refrigerant, which can protect a compressor in time when the refrigerant leaks to a certain degree, thereby prolonging the service life of the compressor and improving the economy and reliability of the air conditioner.
The technical scheme of the invention is as follows:
a refrigerant shortage protection method for a fixed-frequency air conditioner comprises a refrigerant circulation loop consisting of a compressor, a four-way valve, an outdoor heat exchanger, a throttling component, an indoor heat exchanger and a gas-liquid separator, wherein a coil pipe temperature sensor is arranged on a central disc of the indoor heat exchanger; an ambient temperature sensor is arranged beside the indoor heat exchanger; the protection method comprises the following steps:
1) the air conditioner operates in a refrigerating mode, and the compressor is started;
2) detecting the middle temperature Ti of the indoor heat exchanger through a coil temperature sensor; detecting the return air temperature Th of the indoor unit through an ambient temperature sensor; the air conditioner controller records the accumulated running time t of the compressor;
3) if Th-Ti is less than or equal to T2, the duration is more than or equal to T4, and turning to the step 8); otherwise, turning to the step 2); wherein: t2 is a second preset temperature threshold; t4 is a preset threshold value of the accumulated running time of the fourth compressor;
4) if t is less than or equal to t5, turning to step 5); otherwise, turning to the step 2); wherein: t5 is a preset threshold value of the accumulated running time of the fifth compressor;
5) if (Th-Ti) max- (Th-Ti) min is not less than T1, turning to step 6); otherwise, turning to the step 2); wherein: t1 is a first preset temperature threshold;
6) if tmin-tmax is more than 0 and less than or equal to t3, turning to step 7); otherwise, turning to the step 2); wherein: tmax is the accumulated running time of the compressor when the maximum temperature difference between Th and Ti occurs; tmin is the accumulated running time of the compressor when the minimum temperature difference value between Th and Ti occurs; t3 is a preset threshold value of the accumulated running time of the third compressor;
7) if tmax is more than or equal to t1 and tmin is less than or equal to t2, turning to step 8); otherwise, turning to the step 2); wherein: t1 is a preset threshold value of the accumulated running time of the first compressor; t2 is a preset threshold value of the accumulated running time of the second compressor;
8) the air conditioner controller displays the fault, and the code is the refrigerant shortage protection; at the same time, the compressor is shut down.
Further, the temperature of T1 is 0.5-10 ℃; t2 is 0.5-5 ℃; t1 is 1-180 s; t2 is 10-300 s; t3 is 1-180 s; t4 is 5-360 s; t5 is 1-20 min.
Further, t1 < t 2.
The invention has the beneficial effects that:
the invention has reasonable design, clear logic and convenient control, can judge the leakage degree of the refrigerant of the air conditioner and timely protect the compressor by detecting the running time of the compressor, the temperature of the coil pipe of the indoor heat exchanger, the temperature of the indoor environment and other parameters, thereby prolonging the service life of the compressor and improving the economy and reliability of the air conditioner.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
Wherein: 1-a compressor; 2-a four-way valve; 3-an outdoor heat exchanger; 4-a throttling component; 5-a stop valve; 6-indoor heat exchanger; 7-gas-liquid separator; 8-coil temperature sensor; 9-ambient temperature sensor.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, a fixed-frequency air conditioner includes a refrigerant circulation loop composed of a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttling component 4, an indoor heat exchanger 6 and a gas-liquid separator 7, and specifically includes: the exhaust port and the suction port of the compressor 1 are respectively connected with the four-way valve 2 and the gas-liquid separator 7; the other three ports of the four-way valve 2 are respectively connected with an outdoor heat exchanger 3, an indoor heat exchanger 6 and a gas-liquid separator 7; the outdoor heat exchanger 3 and the indoor heat exchanger 6 are connected in series, and a throttling part 4 is arranged between the outdoor heat exchanger and the indoor heat exchanger; the two ends of the indoor heat exchanger 6 are also provided with stop valves 5. Further, a coil pipe temperature sensor 9 is arranged on a middle disc of the indoor heat exchanger 6, and the middle temperature of the indoor heat exchanger can be detected; an ambient temperature sensor 10 is arranged beside the indoor heat exchanger 6 and can detect the return air temperature of the indoor unit. The compressor is a fixed-frequency compressor.
The invention relates to a refrigerant shortage protection method of a fixed-frequency air conditioner, which comprises the following steps:
1) the air conditioner operates in a refrigerating mode, and the compressor is started;
2) detecting the middle temperature Ti of the indoor heat exchanger through a coil temperature sensor; detecting the return air temperature Th of the indoor unit through an ambient temperature sensor; the air conditioner controller records the accumulated running time t of the compressor;
3) if Th-Ti is less than or equal to T2, the duration is more than or equal to T4, and turning to the step 8); otherwise, turning to the step 2); wherein: t2 is a second preset temperature threshold; t4 is a preset threshold value of the accumulated running time of the fourth compressor;
4) if t is less than or equal to t5, turning to step 5); otherwise, turning to the step 2); wherein: t5 is a preset threshold value of the accumulated running time of the fifth compressor;
5) if (Th-Ti) max- (Th-Ti) min is not less than T1, turning to step 6); otherwise, turning to the step 2); wherein: t1 is a first preset temperature threshold;
6) if tmin-tmax is more than 0 and less than or equal to t3, turning to step 7); otherwise, turning to the step 2); wherein: tmax is the accumulated running time of the compressor when the maximum temperature difference between Th and Ti occurs; tmin is the accumulated running time of the compressor when the minimum temperature difference value between Th and Ti occurs; t3 is a preset threshold value of the accumulated running time of the third compressor;
7) if tmax is more than or equal to t1 and tmin is less than or equal to t2, turning to step 8); otherwise, turning to the step 2); wherein: t1 is a preset threshold value of the accumulated running time of the first compressor; t2 is a preset threshold value of the accumulated running time of the second compressor; t1 < t 2;
8) the air conditioner controller displays the fault, and the code is the refrigerant shortage protection; at the same time, the compressor is shut down.
Further, the temperature of T1 is 0.5-10 ℃; t2 is 0.5-5 ℃; t1 is 1-180 s; t2 is 10-300 s; t3 is 1-180 s; t4 is 5-360 s; t5 is 1-20 min.
The control principle of the invention is as follows:
1. when the air conditioner is not provided with the refrigerant, after the compressor is started, as the refrigerant is not evaporated to absorb heat, Ti can not change along with the operation of the compressor, and therefore, whether the air conditioner is lack of the refrigerant can be judged by judging whether the conditions that Th-Ti is less than or equal to T2, the duration time reaches a fourth accumulated operation time preset threshold value and the like are met or not.
2. When the refrigerant quantity held by the air conditioner is low, the gaseous refrigerant of the indoor heat exchanger can be quickly sucked back to the compressor after the compressor is started. At this time, the pressure of refrigerant in the indoor heat exchanger is reduced, so that the liquid refrigerant is forced to evaporate into gas, and the refrigerant is quickly changed into heat to absorb the heat so as to reduce Ti. As the refrigerant is condensed and expanded after being compressed by the compressor, a large amount of low-temperature and low-pressure refrigerant enters the indoor heat exchanger for heat exchange. However, since the refrigerant circulation amount is insufficient, the refrigerant is superheated in the front stage of the evaporator, and Ti is raised and maintained in a relatively stable state. Therefore, when the accumulated operation time of the compressor is less than the fifth accumulated operation time preset threshold value, whether the air conditioner is lack of refrigerant can be judged by judging whether the conditions of (Th-Ti) max- (Th-Ti) min being more than or equal to T1, tmin-tmax being more than 0 and less than or equal to T3, tmax being more than or equal to T1, tmin being less than or equal to T2 and the like are met.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (3)
1. A refrigerant shortage protection method for a fixed-frequency air conditioner comprises a refrigerant circulation loop consisting of a compressor, a four-way valve, an outdoor heat exchanger, a throttling component, an indoor heat exchanger and a gas-liquid separator, and is characterized in that: a coil pipe temperature sensor is arranged on a middle disc of the indoor heat exchanger; an ambient temperature sensor is arranged beside the indoor heat exchanger; the protection method comprises the following steps:
1) the air conditioner operates in a refrigerating mode, and the compressor is started;
2) detecting the middle temperature Ti of the indoor heat exchanger through a coil temperature sensor; detecting the return air temperature Th of the indoor unit through an ambient temperature sensor; the air conditioner controller records the accumulated running time t of the compressor;
3) if Th-Ti is less than or equal to T2, the duration is more than or equal to T4, and turning to the step 8); otherwise, turning to the step 2); wherein: t2 is a second preset temperature threshold; t4 is a preset threshold value of the accumulated running time of the fourth compressor;
4) if t is less than or equal to t5, turning to step 5); otherwise, turning to the step 2); wherein: t5 is a preset threshold value of the accumulated running time of the fifth compressor;
5) if (Th-Ti) max- (Th-Ti) min is not less than T1, turning to step 6); otherwise, turning to the step 2); wherein: t1 is a first preset temperature threshold;
6) if tmin-tmax is more than 0 and less than or equal to t3, turning to step 7); otherwise, turning to the step 2); wherein: tmax is the accumulated running time of the compressor when the maximum temperature difference between Th and Ti occurs; tmin is the accumulated running time of the compressor when the minimum temperature difference value between Th and Ti occurs; t3 is a preset threshold value of the accumulated running time of the third compressor;
7) if tmax is more than or equal to t1 and tmin is less than or equal to t2, turning to step 8); otherwise, turning to the step 2); wherein: t1 is a preset threshold value of the accumulated running time of the first compressor; t2 is a preset threshold value of the accumulated running time of the second compressor;
8) the air conditioner controller displays the fault, and the code is the refrigerant shortage protection; at the same time, the compressor is shut down.
2. The refrigerant shortage protection method of the fixed-frequency air conditioner as claimed in claim 1, wherein: the temperature of T1 is 0.5-10 ℃; t2 is 0.5-5 ℃; t1 is 1-180 s; t2 is 10-300 s; t3 is 1-180 s; t4 is 5-360 s; t5 is 1-20 min.
3. The refrigerant shortage protection method of the fixed-frequency air conditioner as claimed in claim 1, wherein: t1 < t 2.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910980776.7A CN110645673B (en) | 2019-10-16 | 2019-10-16 | Refrigerant shortage protection method for fixed-frequency air conditioner |
| PCT/CN2020/092072 WO2021073098A1 (en) | 2019-10-16 | 2020-05-25 | Fixed-frequency air conditioner refrigerant-deficient protection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910980776.7A CN110645673B (en) | 2019-10-16 | 2019-10-16 | Refrigerant shortage protection method for fixed-frequency air conditioner |
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| CN110645673A CN110645673A (en) | 2020-01-03 |
| CN110645673B true CN110645673B (en) | 2021-03-16 |
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| CN110645673B (en) * | 2019-10-16 | 2021-03-16 | 南京天加环境科技有限公司 | Refrigerant shortage protection method for fixed-frequency air conditioner |
| CN113531933B (en) * | 2021-07-05 | 2022-07-26 | 珠海格力电器股份有限公司 | Refrigerant circulation quantity adjusting method and device and air conditioning system |
| CN114251783B (en) * | 2021-12-18 | 2022-11-18 | 珠海格力电器股份有限公司 | Refrigerant content detection method and device and air conditioner |
| WO2024001316A1 (en) * | 2022-06-30 | 2024-01-04 | 海信空调有限公司 | Air conditioner |
| CN115540200A (en) * | 2022-08-26 | 2022-12-30 | 青岛海尔空调器有限总公司 | Method and device for detecting refrigerant abnormity, air conditioner and storage medium |
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| CN104655365A (en) * | 2014-12-30 | 2015-05-27 | 海信科龙电器股份有限公司 | Method for detecting refrigerant leakage and air conditioner |
| CN105674507B (en) * | 2016-03-07 | 2018-08-14 | 广东美的制冷设备有限公司 | Air conditioner coolant detection method and device |
| CN106196427A (en) * | 2016-06-29 | 2016-12-07 | 珠海格力电器股份有限公司 | A kind of control method preventing from reporting the protection of scarce coolant by mistake |
| JP2018155426A (en) * | 2017-03-16 | 2018-10-04 | 株式会社富士通ゼネラル | Air conditioner |
| CN109539456A (en) * | 2017-09-21 | 2019-03-29 | 奥克斯空调股份有限公司 | A kind of guard method of air conditioner room unit and device |
| CN109114747B (en) * | 2018-08-03 | 2022-07-12 | 奥克斯空调股份有限公司 | Air conditioner fluorine deficiency detection method and system and air conditioner |
| CN110173816B (en) * | 2019-06-17 | 2021-09-03 | 海信（山东）空调有限公司 | Detection method and detection device for air conditioner refrigerant leakage |
| CN110645673B (en) * | 2019-10-16 | 2021-03-16 | 南京天加环境科技有限公司 | Refrigerant shortage protection method for fixed-frequency air conditioner |
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| WO2021073098A1 (en) | 2021-04-22 |
| CN110645673A (en) | 2020-01-03 |
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