CN110645672A - Refrigerant shortage protection method for variable frequency air conditioner - Google Patents
Refrigerant shortage protection method for variable frequency air conditioner Download PDFInfo
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- CN110645672A CN110645672A CN201910971064.9A CN201910971064A CN110645672A CN 110645672 A CN110645672 A CN 110645672A CN 201910971064 A CN201910971064 A CN 201910971064A CN 110645672 A CN110645672 A CN 110645672A
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- compressor
- air conditioner
- temperature sensor
- heat exchanger
- detecting
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a refrigerant shortage protection method for a variable frequency air conditioner, which comprises the following steps: 1) the air conditioner is started to operate, and the frequency of a compressor is greater than 0; 2) detecting the exhaust temperature Tp of the compressor by an exhaust temperature sensor; 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; 3) when any one of the following conditions is met, turning to the step 4); otherwise, turning to the step 2); i) tp is more than or equal to Ta, wherein Ta is a preset threshold value; ii) less than or equal to Tb in the absolute Th-Ti absolute value, the duration is more than t1, and the accumulated running time of the compressor is more than t 2; wherein t1 and t2 are set times; 4) the controller of the air conditioner displays the fault information and the compressor is turned off. The invention has reasonable design, clear logic and convenient control, and can protect the compressor in time under the overload condition that the refrigerant is completely leaked or partially leaked, thereby effectively reducing the maintenance cost and improving the economy and the reliability of the unit.
Description
Technical Field
The invention relates to an air conditioner control method, in particular to a control method of a variable frequency air conditioner, and specifically relates to a refrigerant shortage protection method of the variable frequency air conditioner.
Background
Because inverter air conditioner is split type equipment, need carry out the connection of pipeline, can lead to the system refrigerant volume to reduce because of adopting the unit to take the refrigerant from the evacuation in the installation, also can lead to pipeline connection department to produce because of the installation technique is unqualified, leads to the system refrigerant volume to reduce.
The existing method for protecting the inverter air conditioner from lack of refrigerant mainly judges whether the exhaust temperature exceeds a preset value, and the method can trigger protection in time only when the refrigerant quantity is relatively large; when the quantity of the refrigerant held by the system is small, the detected exhaust temperature can be very low after heat dissipation is carried out on the surface of the shell of the compressor, the protection cannot be triggered in time only by judging the exhaust temperature, and the small quantity of the refrigerant is not enough to take away the heat generated by the coil winding of the compressor, so that the coil winding of the compressor is burnt due to overheating after long-time overload operation, and the use effect of a user is influenced.
Therefore, it is necessary to provide a reliable control method for inverter air conditioner in absence of refrigerant, so as to prolong the service life of the compressor.
Disclosure of Invention
The invention aims to provide a control method for refrigerant shortage protection of a variable frequency air conditioner aiming at the defects of the prior art, which can protect a compressor in time under the overload condition that the refrigerant is completely leaked or partially leaked, thereby effectively reducing the maintenance cost and improving the economical efficiency and the reliability of a unit.
The technical scheme of the invention is as follows:
a refrigerant shortage protection method of a variable 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 an exhaust temperature sensor is arranged on an exhaust pipe of the compressor; 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 is started to operate, and the frequency of a compressor is greater than 0;
2) detecting the exhaust temperature Tp of the compressor by an exhaust temperature sensor; 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;
3) when any one of the following conditions is met, turning to the step 4); otherwise, turning to the step 2);
i) tp is more than or equal to Ta, wherein Ta is a preset threshold value;
ii) less than or equal to Tb in the absolute Th-Ti absolute value, the duration is more than t1, and the accumulated running time of the compressor is more than t 2; wherein t1 and t2 are set times; tb is a preset temperature difference value;
4) the controller of the air conditioner displays the fault information and the compressor is turned off.
Further, the Ta is 80 ~ 125 ℃, the Tb is 0 ~ 10 ℃, the t1 is 1 ~ 5min, and the t2 is 1 ~ 5 min.
The invention has the beneficial effects that:
the invention has reasonable design, clear logic and convenient control, and can protect the compressor in time under the overload condition that the refrigerant is completely leaked or partially leaked, thereby effectively reducing the maintenance cost and improving the economy and the reliability of the unit.
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-exhaust gas temperature sensor; 9-coil temperature sensor; 10-ambient temperature sensor.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, an inverter 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, an exhaust temperature sensor 8 is arranged on an exhaust pipe of the compressor 1 and can detect the exhaust temperature of the compressor; a coil pipe temperature sensor 9 is arranged on a middle disc of the indoor heat exchanger 6 and can detect the middle temperature of the indoor heat exchanger; 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 invention discloses a refrigerant shortage protection method of a variable frequency air conditioner, which comprises the following steps:
1) the air conditioner is started to operate, and the frequency of a compressor is greater than 0;
2) detecting the exhaust temperature Tp of the compressor by an exhaust temperature sensor; 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;
3) when any one of the following conditions is met, turning to the step 4); otherwise, turning to the step 2);
i) tp is more than or equal to Ta, wherein Ta is a preset threshold value;
ii) less than or equal to Tb in the absolute Th-Ti absolute value, the duration is more than t1, and the accumulated running time of the compressor is more than t 2; wherein t1 and t2 are set times; tb is a preset temperature difference value;
4) the controller of the air conditioner displays the fault information and the compressor is turned off.
The temperature of Ta is 80 ~ 125 ℃, the temperature of Tb is 0 ~ 10 ℃, the temperature of t1 is 1 ~ 5min, and the temperature of t2 is 1 ~ 5 min.
The invention can effectively improve the accuracy and timeliness of judging the lack of the refrigerant of the unit by comprehensively judging a plurality of index information such as the exhaust temperature of the inverter air conditioner, and the like, so that the compressor is fully protected.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (2)
1. A refrigerant shortage protection method for a variable 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: an exhaust temperature sensor is arranged on an exhaust pipe of the compressor; 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 is started to operate, and the frequency of a compressor is greater than 0;
2) detecting the exhaust temperature Tp of the compressor by an exhaust temperature sensor; 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;
3) when any one of the following conditions is met, turning to the step 4); otherwise, turning to the step 2);
i) tp is more than or equal to Ta, wherein Ta is a preset threshold value;
ii) less than or equal to Tb in the absolute Th-Ti absolute value, the duration is more than t1, and the accumulated running time of the compressor is more than t 2; wherein t1 and t2 are set times; tb is a preset temperature difference value;
4) the controller of the air conditioner displays the fault information and the compressor is turned off.
2. The refrigerant shortage protection method of the inverter air conditioner as claimed in claim 1, wherein Ta is 80 ~ 125 ℃, Tb is 0 ~ 10 ℃, t1 is 1 ~ 5min, and t2 is 1 ~ 5 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910971064.9A CN110645672A (en) | 2019-10-14 | 2019-10-14 | Refrigerant shortage protection method for variable frequency air conditioner |
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| CN201910971064.9A CN110645672A (en) | 2019-10-14 | 2019-10-14 | Refrigerant shortage protection method for variable frequency air conditioner |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112378035A (en) * | 2020-10-29 | 2021-02-19 | 四川虹美智能科技有限公司 | Sampling value processing method and device for air conditioner temperature sensor |
| CN113280476A (en) * | 2021-04-13 | 2021-08-20 | 安徽嘉乐斯乐净化工程有限公司 | Air conditioning unit with self-protection function |
| CN113701307A (en) * | 2021-09-13 | 2021-11-26 | 宁波奥克斯电气股份有限公司 | Refrigerant shortage protection control method for variable frequency air conditioner and air conditioner |
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| CN101929719A (en) * | 2010-08-27 | 2010-12-29 | 宁波奥克斯空调有限公司 | Method for protecting compressor during fluorine lack of inverter air conditioner |
| CN106016868A (en) * | 2016-06-02 | 2016-10-12 | 珠海格力电器股份有限公司 | Method for automatically adding refrigerant for air conditioning system |
| CN106895558A (en) * | 2017-02-21 | 2017-06-27 | 美的集团股份有限公司 | The detection method and device of air-conditioner coolant leakage |
| CN107421151A (en) * | 2017-07-27 | 2017-12-01 | 广东美的制冷设备有限公司 | Air conditioner and its coolant leakage detection method and device |
| CN108317681A (en) * | 2018-01-02 | 2018-07-24 | 珠海格力电器股份有限公司 | Control method of variable frequency air conditioner and variable frequency air conditioner |
| JP2018146159A (en) * | 2017-03-03 | 2018-09-20 | 日立ジョンソンコントロールズ空調株式会社 | Air conditioner |
-
2019
- 2019-10-14 CN CN201910971064.9A patent/CN110645672A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929719A (en) * | 2010-08-27 | 2010-12-29 | 宁波奥克斯空调有限公司 | Method for protecting compressor during fluorine lack of inverter air conditioner |
| CN106016868A (en) * | 2016-06-02 | 2016-10-12 | 珠海格力电器股份有限公司 | Method for automatically adding refrigerant for air conditioning system |
| CN106895558A (en) * | 2017-02-21 | 2017-06-27 | 美的集团股份有限公司 | The detection method and device of air-conditioner coolant leakage |
| JP2018146159A (en) * | 2017-03-03 | 2018-09-20 | 日立ジョンソンコントロールズ空調株式会社 | Air conditioner |
| CN107421151A (en) * | 2017-07-27 | 2017-12-01 | 广东美的制冷设备有限公司 | Air conditioner and its coolant leakage detection method and device |
| CN108317681A (en) * | 2018-01-02 | 2018-07-24 | 珠海格力电器股份有限公司 | Control method of variable frequency air conditioner and variable frequency air conditioner |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112378035A (en) * | 2020-10-29 | 2021-02-19 | 四川虹美智能科技有限公司 | Sampling value processing method and device for air conditioner temperature sensor |
| CN113280476A (en) * | 2021-04-13 | 2021-08-20 | 安徽嘉乐斯乐净化工程有限公司 | Air conditioning unit with self-protection function |
| CN113701307A (en) * | 2021-09-13 | 2021-11-26 | 宁波奥克斯电气股份有限公司 | Refrigerant shortage protection control method for variable frequency air conditioner and air conditioner |
| CN113701307B (en) * | 2021-09-13 | 2022-10-28 | 宁波奥克斯电气股份有限公司 | Refrigerant shortage protection control method for variable frequency air conditioner and air conditioner |
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