CN105890118A - Method for improving heating effect of multi-connected machine indoor machines and unit thereof - Google Patents
Method for improving heating effect of multi-connected machine indoor machines and unit thereof Download PDFInfo
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- CN105890118A CN105890118A CN201610284353.8A CN201610284353A CN105890118A CN 105890118 A CN105890118 A CN 105890118A CN 201610284353 A CN201610284353 A CN 201610284353A CN 105890118 A CN105890118 A CN 105890118A
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- expansion valve
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- electronic expansion
- compressor
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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
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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
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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
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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
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- 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
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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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a method for improving the heating effect of multi-connected machine indoor machines and a unit thereof. The method comprises the steps of 1, stopping partial indoor machines while partial indoor machines of indoor units (5) carry out heating and carrying out operation for t1; 2, detecting the opening degree of an outdoor machine electronic expansion valve (4), obtaining the saturate temperature value T1 of an outdoor heat exchange machine (3) and detecting the exhaust temperature T2 of a compressor (1); 3, setting the refrigerant lack condition of the indoor machines in the heating mode according to the opening degree of the outdoor machine electronic expansion valve (4), the saturate temperature value T1 and the exhaust temperature T2 in the step 2, implementing the step 4 if the condition is met and otherwise, implementing the step 5; 4, increasing the opening degree of indoor machine electronic expansion valves (6) of the stopped indoor machines, and implementing the step 2; and 5, maintaining the increased opening degree of the indoor machine electronic expansion valves (6) of the stopped indoor machines. The method and the unit have the advantages that the heating effect is guaranteed, and the needed energy consumption is low.
Description
Technical field
The present invention relates to a kind of method promoting mechanism thermal effect in multi-connected machine and unit thereof.
Background technology
Air-conditioning, as the own part through becoming people's life of refrigeration or heating equipment, improves the comfortableness of people's life, but the operation of air-conditioning needs to expend more electric energy.The cycle of the operation of air-conditioning is the longest, and generally operation is no problem in 10 years.At present, the multi-gang air-conditioner on market, particularly when heating, for coolant Biased flow phenomenon, have employed new technical scheme, thus can improve the heating effect of system.
Chinese patent such as Application No. CN201110255060.4, patent name is: the control method of preventing bias flow of refrigerants during heating of multi-connected air conditioning unit, this disclosure of the invention is known clearly the control method of a kind of preventing bias flow of refrigerants during heating of multi-connected air conditioning unit, its realization mainly comprises the following steps: measure temperature T0 in the middle part of indoor heat exchanger, indoor-unit cooling-medium the highest for TO is most, and indoor-unit cooling-medium minimum for TO is minimum；Measure outlet temperature Tlmin of the indoor heat exchanger of the minimum indoor set of coolant, measure outlet temperature Tlmax of the indoor heat exchanger of the most indoor set of coolant, calculate both difference △ T；Judge that △ T, whether more than or equal to 5, is then the aperture of the interior organic electronic expansion valve of indoor set minimum for coolant to be increased, the aperture of the interior organic electronic expansion valve of indoor sets most for coolant is reduced；At set intervals, repeat the above steps, until shutting down.
But above-mentioned technical scheme simply the most simply by indoor set less for the refrigerant return of more for coolant indoor set to coolant, improves the heating effect of system, this technical scheme cannot solve following situation problem out；In VRF Air Conditioning System; when part indoor set is under the state of heating; part indoor set is in stopped status; there will be substantial amounts of liquid storage in being in the indoor set machine of stopped status, when the coolant insufficient total amount of system when, cause the indoor-unit cooling-medium insufficient total amount being under the state of heating; occur that compressor exhaust temperature is too high; occurring that the aperture of off-premises station electric expansion valve is excessive, cause the indoor set heating effect being under the state of heating poor, system energy consumption on the whole is high.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method of machine-processed thermal effect, this control method, it is ensured that in the case of the total coolant of system is certain, it is ensured that heating effect in promoting multi-connected machine, and the most required energy consumption is relatively low.
For solving above-mentioned technical problem, the technical scheme that the present invention provides is: a kind of promote the method for mechanism thermal effect in multi-connected machine, it includes compressor, cross valve, outdoor heat exchange machine, off-premises station electric expansion valve and the indoor units of parallel connection, and the outfan of the indoor set of described indoor units is provided with electronic expansion valve of indoor unit；The outfan of described compressor is connected by the input of cross valve with indoor units in parallel, the input of the outfan of the indoor units of described parallel connection, off-premises station electric expansion valve, outdoor heat exchange machine, cross valve and compressor is sequentially connected with, in order to realize refrigerant circulation；
Step one: wherein, the part indoor set in indoor units is in heating mode, and part indoor set is in shutdown mode, runs the t1 time；
Step 2: the aperture of organic electronic expansion valve outside sensing chamber, it is thus achieved that saturation temperature value T1 of outdoor heat exchange machine, delivery temperature T2 of detection compressor；
Step 3: by the aperture of off-premises station electric expansion valve in step 2, saturation temperature value T1 and delivery temperature T2；Delimit a heating mode indoor set lack coolant condition, if the difference of the aperture of off-premises station electric expansion valve or delivery temperature T2 and delivery temperature T2 meets this condition, enter step 4, otherwise redirect five；
Step 4: increase the aperture of the electronic expansion valve of indoor unit shutting down indoor set, jump to step 2；
Step 5: maintain the aperture of the electronic expansion valve of indoor unit shutting down indoor set after increasing.
As improvement, in step 4, according to increasing the 1% of electronic expansion valve of indoor unit maximum opening every t2S.
As improvement, t2 is 20-40s.
As improvement, if the difference of the aperture of off-premises station electric expansion valve or delivery temperature T2 and delivery temperature T2 meets this condition, enter step 4, otherwise redirect five and refer to that the aperture of off-premises station electric expansion valve is more than 30 degrees Celsius more than 60% or delivery temperature T2 of the maximum opening of off-premises station electric expansion valve with the difference of saturation temperature value T1, meet any one condition, then enter step 4, otherwise redirect five.
As improvement, in step 4, the aperture increased can be added up, and judge whether the aperture of the electronic expansion valve of indoor unit accumulated is more than the 30% of the maximum opening of electronic expansion valve of indoor unit, if more than jumping to step 5, otherwise jump procedure two.
As improvement, in step 2, by detecting the high-pressure P of compressor operating, finding out and saturation temperature value T1 corresponding to this high-pressure P, this saturation temperature value T1 is saturation temperature value T1 of outdoor heat exchange machine.
As improvement, t1 is 10-20 minute.
After using above method, the present invention compared with prior art, has the advantage that by the aperture of organic electronic expansion valve outside sensing chamber, it is thus achieved that saturation temperature value T1 of outdoor heat exchange machine, delivery temperature T2 of detection compressor；Again by the aperture of off-premises station electric expansion valve in step 2, saturation temperature value T1 and delivery temperature T2；Delimit a heating mode indoor set lack coolant condition; if meeting this condition, increase the aperture of the electronic expansion valve of indoor unit shutting down indoor set; increase the aperture of organic electronic expansion valve outside aperture Hou Zaiqu sensing chamber; obtain saturation temperature value T1 of outdoor heat exchange machine; delivery temperature T2 of detection compressor, until maintaining the aperture of the electronic expansion valve of indoor unit shutting down indoor set after being unsatisfactory for the condition of above-mentioned setting.Above-mentioned method; in the case of acquisition heats indoor set cold medium shortage; achieve and will be in the indoor set of stopped status refrigerant return to the indoor set being under the state of heating; do not increase the coolant that system is total; achieve to discharge the coolant of original idle and be used for heating; being favorably improved the heating efficiency of the indoor set being under the state of heating, the most required energy consumption is relatively low.
The technical problem to be solved in the present invention is to provide a kind of unit, this unit, it is ensured that in the case of the total coolant of system is certain, it is ensured that heating effect, and the most required energy consumption is relatively low.
For solving above-mentioned technical problem, the technical scheme that the present invention provides is: a kind of unit, it includes compressor, cross valve, outdoor heat exchange machine, off-premises station electric expansion valve and the indoor units of parallel connection, and the outfan of the indoor set of described indoor units is provided with electronic expansion valve of indoor unit；The outfan of described compressor is connected by the input of cross valve with indoor units in parallel, the input of the outfan of the indoor units of described parallel connection, off-premises station electric expansion valve, outdoor heat exchange machine, cross valve and compressor is sequentially connected with, in order to realize refrigerant circulation；It also include the high-pressure P for detecting compressor operating pressure transducer, be located at the temperature sensor at exhaust outlet of compressor, outside sensing chamber the detection device of the aperture of organic electronic expansion valve and control the controller of aperture of electronic expansion valve of indoor unit；The input of described controller electrically connects with pressure transducer, temperature sensor and detection device respectively, and the outfan of described controller electrically connects with electronic expansion valve of indoor unit.
After using above structure, the present invention compared with prior art, has the advantage that above-mentioned unit can the aperture of organic electronic expansion valve outside sensing chamber, it is thus achieved that saturation temperature value T1 of outdoor heat exchange machine, delivery temperature T2 of detection compressor；Again by the aperture of off-premises station electric expansion valve in step 2, saturation temperature value T1 and delivery temperature T2；Delimit the coolant condition that lacks of indoor set of a heating mode, then increase electronic expansion valve of indoor unit by controller after meeting this condition.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the overall structure schematic diagram of the unit of the present invention.
Fig. 3 is the circuit modular structure schematic diagram of the unit of the present invention.
Shown in figure: 1, compressor, 2, cross valve, 3, outdoor heat exchange machine, 4, off-premises station electric expansion valve, 5, indoor units, 6, electronic expansion valve of indoor unit, 7, pressure transducer, 8, temperature sensor, 9, detection device, 10, controller.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3, the present invention is a kind of promotes the method for mechanism thermal effect in multi-connected machine, it includes the indoor units 5 of compressor 1, cross valve 2, outdoor heat exchange machine 3, off-premises station electric expansion valve 4 and parallel connection, and the outfan of the indoor set of described indoor units 5 is provided with electronic expansion valve of indoor unit 6；The outfan of described compressor 1 is connected by the input of cross valve 2 with indoor units 5 in parallel, the input of the outfan of indoor units 5 of described parallel connection, off-premises station electric expansion valve 4, outdoor heat exchange machine 3, cross valve 2 and compressor 1 is sequentially connected with, in order to realize refrigerant circulation；
Step one: wherein, the part indoor set in indoor units 5 is in heating mode, and part indoor set is in shutdown mode, and the aperture of the electronic expansion valve of indoor unit 6 shutting down indoor set is S, and aperture is that S refers to initial opening, runs the t1 time；
Step 2: step 2: the aperture of organic electronic expansion valve 4 outside sensing chamber, it is thus achieved that saturation temperature value T1 of outdoor heat exchange machine 3, delivery temperature T2 of detection compressor 1；
Step 3: the aperture of off-premises station electric expansion valve 4 is more than 30 degrees Celsius more than 60% or delivery temperature T2 of the maximum opening of off-premises station electric expansion valve 4 with the difference of saturation temperature value T1, meets any one condition, then enters step 4, otherwise redirect five；
Step 4: increase the aperture of the electronic expansion valve of indoor unit 6 shutting down indoor set, i.e. increase on the basis of aperture S, jump to step 2；
Step 5: maintain the aperture of the electronic expansion valve of indoor unit 6 shutting down indoor set after increasing.
In step 4, according to increasing the 1% of electronic expansion valve of indoor unit 6 maximum opening every t2S, t2 is 20-40s, and the application is embodied as taking 30s.Go to increase aperture with a quantitative form according to a time period and within this time period, ensure that the aperture of organic electronic expansion valve 4 outside follow-up acquisition sensing chamber, obtain saturation temperature value T1 of outdoor heat exchange machine 3, delivery temperature T2 of detection compressor 1, the accuracy of these data.
At step 2, the high-pressure P run by detection compressor 1, finding out and saturation temperature value T1 corresponding to this high-pressure P, this saturation temperature value T1 is saturation temperature value T1 of outdoor heat exchange machine 3.
One unit of the present invention, it includes the indoor units 5 of compressor 1, cross valve 2, outdoor heat exchange machine 3, off-premises station electric expansion valve 4 and parallel connection, the outfan of the indoor set of described indoor units 5 is provided with electronic expansion valve of indoor unit 6；The outfan of described compressor 1, the first entrance point of cross valve 2, the input of indoor units 5, off-premises station electric expansion valve 4, outdoor heat exchange machine 3, the second entrance point of cross valve 2 and compressor 1 in parallel are sequentially connected with；It is characterized in that: it also include the pressure transducer 7 for detecting the high-pressure P that compressor 1 runs, be located at the temperature sensor 8 of compressor 1 exhaust ports, for sensing chamber outside the detection device 9 of the aperture of organic electronic expansion valve 4 and the controller 10 of aperture of control electronic expansion valve of indoor unit 6；The input of described controller 10 electrically connects with pressure transducer 7, temperature sensor 8 and detection device 9 respectively, and the outfan of described controller 10 electrically connects with electronic expansion valve of indoor unit 6.
Below only highly preferred embodiment of the present invention is described, but is not to be construed as limitations on claims.The present invention is not limited only to above example, and all various changes made in the protection domain of independent claims of the present invention are the most within the scope of the present invention.
Claims (8)
1. one kind promotes the method for mechanism thermal effect in multi-connected machine, it includes the indoor units (5) of compressor (1), cross valve (2), outdoor heat exchange machine (3), off-premises station electric expansion valve (4) and parallel connection, and the outfan of the indoor set of described indoor units (5) is provided with electronic expansion valve of indoor unit (6)；The outfan of described compressor (1) is connected by the input of cross valve (2) with indoor units (5) in parallel, the input of the outfan of indoor units (5) of described parallel connection, off-premises station electric expansion valve (4), outdoor heat exchange machine (3), cross valve (2) and compressor (1) is sequentially connected with, in order to realize refrigerant circulation；
It is characterized in that: step one: the part indoor set in indoor units (5) is in heating mode, part indoor set is in shutdown mode, runs the t1 time；
Step 2: the aperture of organic electronic expansion valve (4) outside sensing chamber, it is thus achieved that saturation temperature value T1 of outdoor heat exchange machine (3), delivery temperature T2 of detection compressor (1)；
Step 3: by the aperture of off-premises station electric expansion valve (4), saturation temperature value T1 and delivery temperature T2 in step 2；Delimit a heating mode indoor set lack coolant condition, if the difference of the aperture of off-premises station electric expansion valve (4) or delivery temperature T2 and delivery temperature T2 meets this condition, enter step 4, otherwise redirect five；
Step 4: increase the aperture of the electronic expansion valve of indoor unit (6) shutting down indoor set, jump to step 2；
Step 5: maintain the aperture of the electronic expansion valve of indoor unit (6) shutting down indoor set after increasing.
The most according to claim 1 a kind of promote the method for mechanism thermal effect in multi-connected machine, it is characterised in that: in step 4, according to increasing the 1% of electronic expansion valve of indoor unit (6) maximum opening every t2S.
The most according to claim 2 a kind of promote the method for mechanism thermal effect in multi-connected machine, it is characterised in that: t2 is 20-40S.
The most according to claim 1 a kind of promote the method for mechanism thermal effect in multi-connected machine, it is characterized in that: if the difference of the aperture of off-premises station electric expansion valve (4) or delivery temperature T2 and delivery temperature T2 meets this condition, enter step 4, otherwise redirect five and refer to that the aperture of off-premises station electric expansion valve (4) is more than 30 degrees Celsius more than 60% or delivery temperature T2 of the maximum opening of off-premises station electric expansion valve (4) with the difference of saturation temperature value T1, meet any one condition, then enter step 4, otherwise redirect five.
The most according to claim 1 a kind of promote the method for mechanism thermal effect in multi-connected machine, it is characterized in that: in step 4, the aperture increased can be added up, and judge whether the aperture of the electronic expansion valve of indoor unit (6) accumulated is more than the 30% of the maximum opening of electronic expansion valve of indoor unit (6), if more than jumping to step 5, otherwise jump procedure two.
The most according to claim 1 a kind of promote the method for mechanism thermal effect in multi-connected machine, it is characterized in that: in step 2, the high-pressure P run by detection compressor (1), finding out and saturation temperature value T1 corresponding to this high-pressure P, this saturation temperature value T1 is saturation temperature value T1 of outdoor heat exchange machine (3).
The most according to claim 1 a kind of promote the method for mechanism thermal effect in multi-connected machine, it is characterised in that: t1 is 10-20 minute.
8. one kind based on promoting the unit of the control method of mechanism thermal effect in multi-connected machine described in claim 1, it is characterised in that: it also include the pressure transducer (7) for detecting the high-pressure P that compressor (1) runs, be located at the temperature sensor (8) of compressor (1) exhaust ports, for sensing chamber outside the controller (10) of the aperture of the detection device (9) of the aperture of organic electronic expansion valve (4) and control electronic expansion valve of indoor unit (6)；The input of described controller (10) electrically connects with pressure transducer (7), temperature sensor (8) and detection device (9) respectively, and the outfan of described controller (10) electrically connects with electronic expansion valve of indoor unit (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610284353.8A CN105890118B (en) | 2016-04-29 | 2016-04-29 | The method and its unit of mechanism thermal effect in a kind of promotion multi-connected machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610284353.8A CN105890118B (en) | 2016-04-29 | 2016-04-29 | The method and its unit of mechanism thermal effect in a kind of promotion multi-connected machine |
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| CN105890118A true CN105890118A (en) | 2016-08-24 |
| CN105890118B CN105890118B (en) | 2018-10-30 |
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Cited By (9)
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| CN106813360A (en) * | 2017-01-17 | 2017-06-09 | 广东美的暖通设备有限公司 | The anti-cold air control method and apparatus of multiple on-line system and its indoor set |
| CN109455057A (en) * | 2018-10-22 | 2019-03-12 | 珠海格力电器股份有限公司 | A kind of air conditioning control method, device, storage medium and air-conditioning |
| CN109682021A (en) * | 2018-12-13 | 2019-04-26 | 青岛海信日立空调系统有限公司 | A kind of outdoor unit guard method and device, air-conditioning system |
| CN110244143A (en) * | 2019-05-23 | 2019-09-17 | 格力电器（武汉）有限公司 | Electric expansion valve detection system |
| CN110793170A (en) * | 2019-11-13 | 2020-02-14 | 四川长虹空调有限公司 | Judgment method for insufficient refrigerant of air conditioning system and air conditioner |
| CN111023433A (en) * | 2019-12-31 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Multi-split refrigerant-lack control method and device, storage medium and air conditioning system |
| CN111947273A (en) * | 2020-08-10 | 2020-11-17 | 三菱重工海尔(青岛)空调机有限公司 | Method for recovering and stopping indoor machine refrigerant |
| CN113188230A (en) * | 2021-04-16 | 2021-07-30 | 宁波奥克斯电气股份有限公司 | Expansion valve control method and device of multi-connected air conditioner and multi-connected air conditioner |
| CN115523599A (en) * | 2022-08-30 | 2022-12-27 | 宁波奥克斯电气股份有限公司 | Control method and control device of multi-connected air conditioner, air conditioner and storage medium |
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| US10782041B2 (en) * | 2017-01-17 | 2020-09-22 | Gd Midea Heating & Ventilating Equipment Co., Ltd. | Multi-type air conditioning system and anti-cold-air control method and apparatus of indoor unit thereof |
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| CN109455057B (en) * | 2018-10-22 | 2020-04-28 | 珠海格力电器股份有限公司 | Air conditioner control method and device, storage medium and air conditioner |
| CN109682021A (en) * | 2018-12-13 | 2019-04-26 | 青岛海信日立空调系统有限公司 | A kind of outdoor unit guard method and device, air-conditioning system |
| CN110244143A (en) * | 2019-05-23 | 2019-09-17 | 格力电器（武汉）有限公司 | Electric expansion valve detection system |
| CN110793170A (en) * | 2019-11-13 | 2020-02-14 | 四川长虹空调有限公司 | Judgment method for insufficient refrigerant of air conditioning system and air conditioner |
| CN111023433A (en) * | 2019-12-31 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Multi-split refrigerant-lack control method and device, storage medium and air conditioning system |
| CN111023433B (en) * | 2019-12-31 | 2021-10-22 | 宁波奥克斯电气股份有限公司 | Multi-split refrigerant-lack control method and device, storage medium and air conditioning system |
| CN111947273A (en) * | 2020-08-10 | 2020-11-17 | 三菱重工海尔(青岛)空调机有限公司 | Method for recovering and stopping indoor machine refrigerant |
| CN113188230A (en) * | 2021-04-16 | 2021-07-30 | 宁波奥克斯电气股份有限公司 | Expansion valve control method and device of multi-connected air conditioner and multi-connected air conditioner |
| CN113188230B (en) * | 2021-04-16 | 2022-06-28 | 宁波奥克斯电气股份有限公司 | Expansion valve control method and device of multi-connected air conditioner and multi-connected air conditioner |
| CN115523599A (en) * | 2022-08-30 | 2022-12-27 | 宁波奥克斯电气股份有限公司 | Control method and control device of multi-connected air conditioner, air conditioner and storage medium |
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