CN114963406B - Control method for improving operation reliability of long connecting pipe unit - Google Patents
Control method for improving operation reliability of long connecting pipe unit Download PDFInfo
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- CN114963406B CN114963406B CN202210559662.7A CN202210559662A CN114963406B CN 114963406 B CN114963406 B CN 114963406B CN 202210559662 A CN202210559662 A CN 202210559662A CN 114963406 B CN114963406 B CN 114963406B
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- opening
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- electronic expansion
- expansion valve
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000010257 thawing Methods 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 15
- 239000003507 refrigerant Substances 0.000 abstract description 6
- 238000004378 air conditioning Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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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
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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
- F24F11/41—Defrosting; Preventing freezing
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
-
- 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
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a control method for improving the operation reliability of a long connecting pipe unit, which comprises the following steps: 1) The unit operates a heating mode, receives a defrosting command, and starts to reduce the frequency of the compressor; 2) Detecting the opening P 0 of the current heating electronic expansion valve; 3) If P 0≥0.7Pmax, turning to the step 4); if P 0＜0.7Pmax is not more than 0.4, turning to the step 5); if P 0＜0.4Pmax, turning to the step 6); wherein P max is the maximum opening of the heating electronic expansion valve; 4) The opening of the heating electronic expansion valve is adjusted to the initial valve opening of the current environment temperature; then, turning to step 7); 5) The opening of the heating electronic expansion valve is adjusted to 0.5P 0; then, turning to step 7); 6) The opening of the heating electronic expansion valve is adjusted to the minimum valve opening corresponding to the current environment temperature; then, turning to step 7); 7) The four-way valve is switched, and the unit starts defrosting. The invention can avoid the problem that the liquid refrigerant in the gas component is easily increased when the unit enters the defrosting mode to reduce the frequency of the compressor, and eliminates the potential safety hazard.
Description
Technical Field
The invention relates to an air conditioner control method, in particular to a control method suitable for a long connecting pipe unit, and specifically relates to a control method for improving the operation reliability of the long connecting pipe unit.
Background
With the development of the current society, the air conditioning unit is more and more widely applied to the living scenes of people. For public places such as: large central air conditioning air duct units are often used in shops, hospitals, exhibition halls, etc. For large units, the indoor units and the outdoor units are generally far apart, and long connecting pipes are required to be used for transmitting the refrigerant. In order to meet the performance and room comfort of the unit, the refrigerant filling amount needs to be increased. Therefore, the unit is easy to frost under the low-temperature condition, and the heat exchange effect is affected. Meanwhile, when the unit enters defrosting operation, the unit needs to be firstly subjected to frequency reduction, and at the moment, the electronic expansion valve does not act, so that liquid refrigerants in gas components are increased, liquid return phenomenon is easy to generate, even liquid impact of a compressor is generated, and the compressor is damaged.
Therefore, improvements are needed to better meet market demands.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a control method for improving the operation reliability of a long connecting pipe unit, which can effectively avoid the problem that liquid refrigerants in gas components are easily increased to generate liquid return when the unit enters a defrosting mode to reduce the frequency of a compressor, eliminate potential safety hazards and improve the operation reliability of the unit.
The technical scheme of the invention is as follows:
a control method for improving the operation reliability of a long connecting pipe unit comprises the following steps:
1) The unit operates a heating mode, receives a defrosting command, and starts to reduce the frequency of the compressor;
2) Detecting the opening P 0 of the current heating electronic expansion valve;
3) If P 0≥0.7Pmax, turning to the step 4); if P 0＜0.7Pmax is not more than 0.4, turning to the step 5); if P 0＜0.4Pmax, turning to the step 6); wherein P max is the maximum opening of the heating electronic expansion valve;
4) The opening of the heating electronic expansion valve is adjusted to the initial valve opening of the current environment temperature; then, turning to step 7);
5) The opening of the heating electronic expansion valve is adjusted to 0.5P 0; then, turning to step 7);
6) The opening of the heating electronic expansion valve is adjusted to the minimum valve opening corresponding to the current environment temperature; then, turning to step 7);
7) The four-way valve is switched, and the unit starts defrosting.
Further, in the step 4), an initial valve opening of the ambient temperature is preset for the unit.
Further, in the step 6), the minimum valve opening corresponding to the ambient temperature is preset for the unit.
The invention has the beneficial effects that:
The invention has reasonable design, clear logic and convenient control, can effectively avoid the problem that liquid refrigerant in gas component is easily increased to generate liquid return when the unit enters a defrosting mode to reduce the frequency of a compressor by adjusting the opening degree of the thermal electron expansion valve, eliminates potential safety hazard and improves the operation reliability of the long connecting pipe unit.
Detailed Description
The invention is further illustrated below with reference to examples.
A control method for improving the operation reliability of a long connecting pipe unit comprises the following steps:
1) The unit operates a heating mode, receives a defrosting command, and starts to reduce the frequency of the compressor; the frequency-reducing process is usually about 1 min;
2) Detecting the current opening P 0 of the heating electronic expansion valve;
3) If P 0≥0.7Pmax, turning to the step 4); if P 0＜0.7Pmax is not more than 0.4, turning to the step 5); if P 0＜0.4Pmax, turning to the step 6); wherein P max is the maximum opening of the heating electronic expansion valve;
4) The opening of the heating electronic expansion valve is adjusted to the initial valve opening of the current environment temperature; then, turning to step 7); the opening of the initial valve is preset for the unit;
5) The opening of the heating electronic expansion valve is adjusted to 0.5P 0; then, turning to step 7);
6) The opening of the heating electronic expansion valve is adjusted to the minimum valve opening corresponding to the current environment temperature; then, turning to step 7); the minimum valve opening is preset for the unit
7) The four-way valve is switched, and the unit starts defrosting.
The invention performs experimental verification on a certain brand of air-conditioning product, and specifically comprises the following steps:
The product is a 25P common variable-frequency single-system full fresh air pipe machine, the connecting pipe length is 100 meters, and the gas separation volume is 24L. In the original control logic, when the unit is thicker in frost layer, the liquid level of the gas component is generally at the position of 18L. After the defrosting control command is started, the unit is subjected to frequency reduction, the liquid level is obviously increased to the position which can reach 21.7L at the highest when the four-way valve is switched, and a large liquid return risk exists. After the control method is adopted, when the unit frequency reduction is finished, the liquid level of the gas component is about 18.1L, compared with the liquid before defrosting, the liquid level is not obviously changed, the occurrence of liquid return is effectively prevented, and the operation reliability of the long connecting pipe unit is improved.
The invention is not related in part to the same as or can be practiced with the prior art.
Claims (3)
1. The control method for improving the operation reliability of the long connecting pipe unit is characterized by comprising the following steps of:
1) The unit operates a heating mode, receives a defrosting command, and starts to reduce the frequency of the compressor;
2) Detecting the opening P0 of the current heating electronic expansion valve;
3) If P0 is more than or equal to 0.7P max, turning to the step 4); if the P max is more than or equal to 0.4P max and less than 0.7P max, turning to the step 5); if P0 is less than 0.4P max, turning to the step 6); wherein, P max is the maximum opening of the heating electronic expansion valve;
4) The opening of the heating electronic expansion valve is adjusted to the initial valve opening of the current environment temperature; then, turning to step 7);
5) The opening of the heating electronic expansion valve is regulated to 0.5P0; then, turning to step 7);
6) The opening of the heating electronic expansion valve is adjusted to the minimum valve opening corresponding to the current environment temperature; then, turning to step 7);
7) The four-way valve is switched, and the unit starts defrosting.
2. The control method for improving the operation reliability of the long connecting pipe unit according to claim 1, wherein in the step 4), the initial valve opening of the ambient temperature is preset for the unit.
3. The control method for improving the operation reliability of the long connecting pipe unit according to claim 1, wherein in the step 6), the minimum valve opening corresponding to the ambient temperature is preset for the unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210559662.7A CN114963406B (en) | 2022-05-23 | 2022-05-23 | Control method for improving operation reliability of long connecting pipe unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210559662.7A CN114963406B (en) | 2022-05-23 | 2022-05-23 | Control method for improving operation reliability of long connecting pipe unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114963406A CN114963406A (en) | 2022-08-30 |
| CN114963406B true CN114963406B (en) | 2024-06-04 |
Family
ID=82985031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210559662.7A Active CN114963406B (en) | 2022-05-23 | 2022-05-23 | Control method for improving operation reliability of long connecting pipe unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114963406B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101532705A (en) * | 2009-04-21 | 2009-09-16 | 海信（山东）空调有限公司 | Cold and warm type frequency conversion air conditioner and defrosting method thereof |
| CN104676996A (en) * | 2015-03-19 | 2015-06-03 | 珠海格力电器股份有限公司 | Generation method and generation system for initial opening degree of electronic expansion valve |
| CN105164473A (en) * | 2013-09-12 | 2015-12-16 | 富士通将军股份有限公司 | Air conditioner device |
| JP6138711B2 (en) * | 2014-02-13 | 2017-05-31 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド | Air conditioner |
| CN107166639A (en) * | 2017-05-10 | 2017-09-15 | 青岛海尔空调器有限总公司 | A kind of air conditioner defrosting control method, control device and air conditioner |
| CN107461877A (en) * | 2017-07-19 | 2017-12-12 | 青岛海尔空调电子有限公司 | A kind of multiple on-line system defrosting control method |
| CN109959120A (en) * | 2019-03-21 | 2019-07-02 | 宁波奥克斯电气股份有限公司 | The Defrost method and air conditioner of air conditioner |
| CN111981638A (en) * | 2020-08-21 | 2020-11-24 | Tcl空调器(中山)有限公司 | Control method of expansion valve, defrosting device, air conditioner and storage medium |
-
2022
- 2022-05-23 CN CN202210559662.7A patent/CN114963406B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101532705A (en) * | 2009-04-21 | 2009-09-16 | 海信（山东）空调有限公司 | Cold and warm type frequency conversion air conditioner and defrosting method thereof |
| CN105164473A (en) * | 2013-09-12 | 2015-12-16 | 富士通将军股份有限公司 | Air conditioner device |
| JP6138711B2 (en) * | 2014-02-13 | 2017-05-31 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド | Air conditioner |
| CN104676996A (en) * | 2015-03-19 | 2015-06-03 | 珠海格力电器股份有限公司 | Generation method and generation system for initial opening degree of electronic expansion valve |
| CN107166639A (en) * | 2017-05-10 | 2017-09-15 | 青岛海尔空调器有限总公司 | A kind of air conditioner defrosting control method, control device and air conditioner |
| CN107461877A (en) * | 2017-07-19 | 2017-12-12 | 青岛海尔空调电子有限公司 | A kind of multiple on-line system defrosting control method |
| CN109959120A (en) * | 2019-03-21 | 2019-07-02 | 宁波奥克斯电气股份有限公司 | The Defrost method and air conditioner of air conditioner |
| CN111981638A (en) * | 2020-08-21 | 2020-11-24 | Tcl空调器(中山)有限公司 | Control method of expansion valve, defrosting device, air conditioner and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114963406A (en) | 2022-08-30 |
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