CN107917505A - A kind of multi-split air conditioner and its outdoor unit defrosting control method - Google Patents

A kind of multi-split air conditioner and its outdoor unit defrosting control method Download PDF

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Publication number
CN107917505A
CN107917505A CN201711082304.7A CN201711082304A CN107917505A CN 107917505 A CN107917505 A CN 107917505A CN 201711082304 A CN201711082304 A CN 201711082304A CN 107917505 A CN107917505 A CN 107917505A
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CN
China
Prior art keywords
temperature
defrost
unit
outdoor unit
solenoid valve
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Granted
Application number
CN201711082304.7A
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Chinese (zh)
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CN107917505B (en
Inventor
巫海云
张磊
何林
舒宏
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201711082304.7A priority Critical patent/CN107917505B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles

Abstract

The invention discloses a kind of multi-split air conditioner and its outdoor unit defrosting method.The method is set temperature sensor at the gas-liquid separator of compressor air inlet side and at outdoor unit, and whether reach setting defrost temperature according to outdoor unit temperature and gas-liquid separator temperature respectively, and whether control unit enters defrosting operation.For the present invention under main body heating mode, unit can accurately judge defrost condition, prevent unit to be introduced into defrost pattern, the generation of frosting serious situation occurs in unit, and unit efficiency is stablized.

Description

A kind of multi-split air conditioner and its outdoor unit defrosting control method
Technical field
The present invention relates to a kind of field of air conditioning, more particularly to a kind of multi-split air conditioner and its room
Outer machine defrosting control method.
Background technology
With the development of multi-split air conditioner, unit required in terms of control model is run it is relatively more, including complete Full refrigeration, completely heating, recuperation of heat, main body heating and main body refrigeration mode.Defrosting method under various heating modes is set to For unit performance and the important guarantee of reliability operation, defrost will not exclusively cause unit heating performance degradation, not only hold System is easily caused to produce high voltage protective and can seriously drag down unit efficiency.Unit heating mode is divided into heating, recuperation of heat and main body Heating, this depends on the setting pattern and quantity of not machine in chummery.If machine both participates in heating referred to as heating mode in whole; Machine is equal with machine requirement capability in B rooms refrigeration in the heating of A rooms, then refrigerant carries out B room evaporations after the condensation of A rooms, this The identical situation of kind cooling and warming requirement capability is heat recovery mode;A rooms heating capacity demand is needed more than B rooms refrigerating capacity Ask, which is main system heat pattern.Different heating modes causes unit to enter defrost condition also can be different, if unit is only Defrost demand under all heating modes can not then be met by setting a kind of defrost logic.
Currently for the setting of unit a variety of heating modes defrosting method there are segmental defect, be mainly reflected in lower section Face:
1. for general unit judgement defrost condition mainly under complete heating mode, decision condition does not simultaneously meet main body heating mode, It is easy to cause main body heating mode unit and is introduced into defrost, unit frosting serious situation.
2. the defrosting method of complete heating mode, under main body heating mode, defrost condition has not met generating set main body system Hot operating status is, it is necessary to readjust unit temperature sensing package and decision condition.
It is necessary to propose a kind of method for carrying out complete defrost for all heating modes of unit, this method mainly shows Under main body heating mode, unit can accurately judge defrost condition, prevent unit to be introduced into defrost pattern, and unit frosting is serious Situation occurs.
The content of the invention
The present invention proposes a kind of multi-split air conditioner and its outdoor unit defrosting control method, and the control method is in main body system Under heat pattern, unit can accurately judge defrost condition, prevent unit to be introduced into defrost pattern, unit frosting serious situation hair It is raw.
The present invention proposes a kind of multi-split air conditioner outdoor unit defrosting control method, and the control method is respectively in compressor Set temperature sensor at the gas-liquid separator of air inlet side and at outdoor unit, and according to outdoor unit temperature and gas-liquid separator temperature Whether setting defrost temperature is reached, and whether control unit enters defrosting operation.
In one embodiment, the control method comprises the following steps:
The start operation of step 1. unit, judges whether system is heating mode, is to go to step 2, no, then without outdoor unit Defrosting operation;
Step 2. judges whether unit accumulated running time reaches setting value, is, goes to step 3, no, then without outdoor unit Frost operation;
Step 3. judges whether outdoor unit operating ambient temperature is in defrost temperature range(tn≤tRing≤tm), meanwhile, judge room Whether temperature t2 is less than or equal to enter defrost desired temperature ta at outer machine, goes to step 6 if above-mentioned condition is satisfied by, no, then Go to step 4;
If step 4. outdoor unit operating ambient temperature is in defrost temperature range(tn≤tRing≤tm), while judge gas-liquid separator Whether place temperature t1 is less than or equal to enter defrost desired temperature tb, goes to step 6 if above-mentioned condition is satisfied by, no, then turns to walk Rapid 5;
If step 5. outdoor unit operating ambient temperature is in defrost temperature range(tn≤tRing≤tm), then judge that unit adds up to run Whether time T is more than accumulative operation setting time, if so, 6 are then gone to step, it is no, then without defrosting operation;
Step 6. unit enters defrosting operation.
Judge outdoor environment temperature t after step 7. unit defrostRingWhether it is more than or equal to and terminates defrost design temperature tp, if It is then to go to step 8, no, then step 9;
Step 8. judges outdoor unit outer tube temperature tOuter tubeWhether it is more than or equal to and exits defrost desired temperature(tOuter tube≥tc), and defrost Duration TContinuouslyWhether defrost operation setting time is more than or equal to(TContinuously≥T1), it is then to go to step 10, it is no, then go to step 9;
Step 9. judges whether outdoor unit outer tube temperature is more than or equal to and exits defrost desired temperature(tOuter tube≥td), and defrost is held Whether the continuous time is more than or equal to defrost operation setting time(TContinuously≥T2), it is then to go to step 10, it is no, then continue defrosting operation;
Step 10. exits defrosting operation.
The present invention also proposes a kind of multi-split air conditioner, including compressor, more indoor units in parallel, outdoor unit and control Device processed, the compressor air inlet side are equipped with gas-liquid separator, wherein, at the gas-liquid separator of compressor air inlet side and at outdoor unit Temperature sensor is respectively arranged with, whether the controller reaches setting defrost according to outdoor unit temperature and gas-liquid separator temperature Whether temperature, control unit enter defrosting operation.
Since second indoor unit, every indoor unit both ends are connected first solenoid valve and second electromagnetism respectively It is in parallel with First indoor unit after valve, a pipeline and the gas-liquid are drawn between the indoor unit in parallel and the first solenoid valve The entrance connection of separator, the pipeline are equipped with the 3rd solenoid valve and a temperature sensor.
Air-conditioning system proposed by the present invention is equipped with complete heating mode and main body heating mode.
In complete heating mode, the first solenoid valve, second solenoid valve and throttle valve are opened, and the 3rd solenoid valve is closed, pressure Contracting machine discharge refrigerant flows through each indoor unit, the complete heating mode of system operation.
In main body heating mode, second solenoid valve, the 3rd solenoid valve and throttle valve are opened, and the first solenoid valve is closed, pressure Contracting machine discharge refrigerant enters the condensation heat release of the first indoor unit, and a part of refrigerant flows back to compressor, a part of refrigerant warp through throttle valve Second solenoid valve gets in machine evaporation, then enters compressor after the 3rd solenoid valve flows into gas-liquid separator.
Compared with prior art, technical solution proposed by the present invention can be directed to all heating modes of unit and carry out completion Frost, is mainly manifested under main body heating mode, and unit can accurately judge defrost condition, prevent unit to be introduced into defrost pattern, machine There is the generation of frosting serious situation in group, and unit efficiency is stablized.
Brief description of the drawings
The present invention will be described in detail with reference to the accompanying drawings and examples, wherein:
Fig. 1 is the system flow schematic diagram of the present invention;
Fig. 2 is present system outdoor unit defrosting operation flow diagram.
Embodiment
The present invention sets two groups of defrost temperature sensing packages and is used to detect operating states of the units in systems, judges gas-liquid using priority Whether temperature enters defrost setting condition at separator and at outdoor unit, avoids defrost temperature sensing package mould at single judgement outdoor unit Formula, effectively prevent the situation generation that unit under system body heating mode does not timely enter defrosting control.
Fig. 1 show the system flow chart of one drag two air-conditioning.The air-conditioning system includes 5, two interiors in parallel of compressor Machine 6, throttle valve 4, outdoor unit 8 and controller.Compressor air inlet side is equipped with gas-liquid separator 9, and exhaust side is equipped with oil eliminator 10. The both ends of second indoor unit 7 connect respectively after first solenoid valve 1 and a second solenoid valve 2 with First indoor unit 6 It is in parallel.Draw a pipeline between second 7 and first solenoid valve 1 of indoor unit to be connected with the entrance of gas-liquid separator 9, the pipeline It is equipped with the 3rd solenoid valve 3.Temperature sensor 11 and 12 is equipped with gas-liquid separator 9 and outdoor unit 8, air-conditioning system The outdoor unit defrosting operation for the temperature control air-conditioning system that controller is detected according to this two groups of temperature sensors.
The one drag two air-conditioning system that Fig. 1 is shown is equipped with complete heating mode and main body heating mode.
In complete heating mode, the first solenoid valve 1, second solenoid valve 2, throttle valve 4 are opened, and the 3rd solenoid valve 4 is closed. The refrigerant of compressor discharge flows through indoor unit 6 and 7, then returns to compressor by throttle valve 4, outdoor unit 8, gas-liquid separator, Complete a heating circulation.
In main body heating mode, second solenoid valve 2, throttle valve 4, the 3rd solenoid valve 3 are opened, and the first solenoid valve 1 is closed, The refrigerant of compressor discharge enters the condensation heat release of the first indoor unit 1, and a part of refrigerant is through throttle valve 4, outdoor unit 8, gas-liquid separation Device 9 flows back to compressor, and a part of refrigerant enters in the second indoor unit 7 through second solenoid valve 2 to be evaporated, then is flowed through the 3rd solenoid valve 3 Enter compressor after entering gas-liquid separator.
Under main body heating mode, since unit refrigerant is shunted, what the temperature sensor 12 of outdoor unit measured Defrost temperature is lower than the temperature measured under complete heating mode, if defrost at this time still according under complete heating mode into OK, unit cannot timely enter defrost program.
Fig. 2 shows multi-split air conditioner outdoor unit defrosting method proposed by the present invention, comprises the following steps:
The start operation of step 1. unit, judges whether system is heating mode, is then to go to step 2, no, then without outdoor unit Defrosting operation;
Step 2. judges that compressor and outdoor fan add up whether the opening time reaches accumulated running time T, is to go to step 3, It is no, then without outdoor unit defrosting operation;
Step 3. judges outdoor unit operating ambient temperature tRingWhether defrost temperature range, i.e. tn≤t are inRing≤ tm, tn are defrosts Temperature range lower limit, tm are defrost temperature range upper limit values, meanwhile, judge whether temperature t2 is less than or equal to enter at outdoor unit Defrost desired temperature ta, 6 are gone to step if above-mentioned condition is satisfied by, otherwise goes to step 4;
If step 4. outdoor unit operating ambient temperature tRingIn defrost temperature range, i.e. during tn≤t rings≤tm, judge gas-liquid separation Whether temperature t1 is less than or equal to enter defrost desired temperature tb at device, i.e. t1≤tb, goes to step if above-mentioned condition is satisfied by 6, otherwise go to step 5;
If step 5. outdoor unit temperature t2 is located at defrost temperature range, tn≤tRing≤ tm, temperature t1 and outdoor at gas-liquid separator Temperature t2 is unsatisfactory for entering defrost desired temperature at machine, then judges whether unit accumulated running time T is more than accumulative setting Value, T≤TMachine, if so, 6 are then gone to step, and it is no, then without defrosting operation;
Step 6. unit enters defrosting operation;
Judge outdoor environment temperature t after step 7. unit defrostRingWhether it is more than and terminates defrost set temperature value tp, tRing>=tp, if It is then to go to step 8, no, then step 9;
Step 8. judges outdoor unit outer tube temperature tOuter tubeWhether it is more than or equal to and exits defrost desired temperature tc, tOuter tube>=tc, and change White duration TContinuouslyWhether defrost running time T 1, T is more than or equal toContinuously>=T1, is then to go to step 10, no, then goes to step 9;
Step 9. judges outdoor unit outer tube temperature tOuter tubeWhether it is more than or equal to and exits defrost desired temperature td, i.e. tOuter tube>=td, and Defrost duration TContinuouslyWhether defrost running time T 2, i.e. T are more than or equal toContinuously>=T2, is then to go to step 10, no, then continuation Frost operation;
Step 10. exits defrosting operation.
Wherein:
Ta is to be set into defrost temperature 1;
Tb is to be set into defrost temperature 2;
Tn enters defrost design temperature 1 for unit;
Tm enters defrost design temperature 2 for unit;
T is unit accumulated running time;
T machines add up operation for setting unit and enter the defrost time;
Tp is end defrost logic judgment temperature after unit defrost operation;
tOuter tubeFor outer machine condenser tube temperature after unit defrost;
tc:Unit exits defrost tube temperature 1;
Td exits defrost tube temperature 2 for unit;
TContinuouslyFor unit defrost run time;
T1 exits unit defrost run time 1 before defrost for unit;
T2 exits unit defrost run time 2 before defrost for unit.
Above-mentioned setting value is the numeral set according to air-conditioning system operating status, and can be carried out according to actual operating mode Adjustment.The above method is not limited to one drag two air-conditioning system.Method proposed by the present invention can realize outdoor unit under all heating modes Defrost, and air-conditioning system efficiency stablize.
It is to be understood that the application of the present invention is not limited to the embodiment, for those of ordinary skill in the art, On the premise of not departing from present inventive concept, some deformations and change can also be made, these deformations and change should all belong to this hair Bright protection domain.

Claims (10)

1. a kind of multi-split air conditioner outdoor unit defrosting control method, it is characterised in that respectively in the gas of compressor air inlet side Set temperature sensor at liquid/gas separator and at outdoor unit, and set according to whether outdoor unit temperature and gas-liquid separator temperature reach Determine defrost temperature, whether control unit enters defrosting operation.
2. control method as claimed in claim 1, it is characterised in that comprise the following steps:
The start operation of step 1. unit, judges whether system is heating mode, is to go to step 2, no, then without outdoor unit Defrosting operation;
Step 2. judges whether unit accumulated running time reaches setting value, is, goes to step 3, no, then without outdoor unit Frost operation;
Step 3. judges whether outdoor unit operating ambient temperature is in defrost temperature range(tn≤tRing≤tm), meanwhile, judge room Whether temperature t2 is less than or equal to enter defrost desired temperature ta at outer machine, goes to step 6 if above-mentioned condition is satisfied by, no, then Go to step 4;
If step 4. outdoor unit operating ambient temperature is in defrost temperature range(tn≤tRing≤tm), while judge gas-liquid separator Whether place temperature t1 is less than or equal to enter defrost desired temperature tb, goes to step 6 if above-mentioned condition is satisfied by, no, then turns to walk Rapid 5;
If step 5. outdoor unit operating ambient temperature is in defrost temperature range(tn≤tRing≤tm), then judge that unit adds up to run Whether time T is more than accumulative operation setting time, if so, 6 are then gone to step, it is no, then without defrosting operation;
Step 6. unit enters defrosting operation.
3. control method as claimed in claim 2, it is characterised in that further include:
Judge outdoor environment temperature t after step 7. unit defrostRingWhether it is more than or equal to and terminates defrost design temperature tp, if so, then Go to step 8, no, then step 9;
Step 8. judges outdoor unit outer tube temperature tOuter tubeWhether it is more than or equal to and exits defrost desired temperature(tOuter tube≥tc), and defrost Duration TContinuouslyWhether defrost operation setting time is more than or equal to(TContinuously≥T1), it is then to go to step 10, it is no, then go to step 9;
Step 9. judges whether outdoor unit outer tube temperature is more than or equal to and exits defrost desired temperature(tOuter tube≥td), and defrost is held Whether the continuous time is more than or equal to defrost operation setting time(TContinuously≥T2), it is then to go to step 10, it is no, then continue defrosting operation;
Step 10. exits defrosting operation.
4. a kind of multi-split air conditioner, including compressor, more indoor units in parallel, throttle valve, outdoor unit and controller, institute State compressor air inlet side and be equipped with gas-liquid separator, it is characterised in that at the gas-liquid separator of compressor air inlet side and at outdoor unit Temperature sensor is respectively arranged with, whether the controller reaches setting defrost according to outdoor unit temperature and gas-liquid separator temperature Whether temperature, control unit enter defrosting operation.
5. multi-split air conditioner as claimed in claim 4, it is characterised in that since second indoor unit, every interior Machine both ends are connected, the in parallel room in parallel with First indoor unit after first solenoid valve and a second solenoid valve respectively Draw a pipeline between interior machine and the first solenoid valve to be connected with the entrance of the gas-liquid separator, the pipeline is equipped with one the Three solenoid valves.
6. multi-split air conditioner as claimed in claim 5, it is characterised in that temperature sensor is arranged at gas-liquid separator On the pipeline.
7. such as claim 4-6 any one of them multi-split air conditioners, it is characterised in that the air-conditioning system is equipped with complete Heating mode and main body heating mode.
8. multi-split air conditioner as claimed in claim 7, it is characterised in that in complete heating mode, the first solenoid valve (1), second solenoid valve(2)And throttle valve(4)Open, the 3rd solenoid valve(3)Close, compressor discharge refrigerant flows through each interior Machine, the complete heating mode of system operation.
9. multi-split air conditioner as claimed in claim 7, it is characterised in that in main body heating mode, second solenoid valve (2), the 3rd solenoid valve(3)And throttle valve(4)Open, the first solenoid valve(1)Close, it is indoor that compressor discharge refrigerant enters first Machine condenses heat release, and a part of refrigerant is through throttle valve(4)Compressor is flowed back to, a part of refrigerant is through second solenoid valve(2)Get in Machine evaporates, then through the 3rd solenoid valve(3)Enter compressor after flowing into gas-liquid separator.
10. multi-split air conditioner as claimed in claim 4, it is characterised in that the compressor air-discharging pipeline is equipped with oil Separator.
CN201711082304.7A 2017-11-07 2017-11-07 A kind of multi-split air conditioner and its outdoor unit defrosting control method Active CN107917505B (en)

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Cited By (5)

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CN108800435A (en) * 2018-06-01 2018-11-13 青岛海尔空调器有限总公司 air conditioner defrosting control method
CN108800451A (en) * 2018-06-01 2018-11-13 青岛海尔空调器有限总公司 air conditioner defrosting control method
CN110425686A (en) * 2019-08-09 2019-11-08 珠海格力电器股份有限公司 Air cooling module unit defrosting control method, computer installation and computer readable storage medium
CN110542175A (en) * 2019-09-06 2019-12-06 珠海格力电器股份有限公司 air conditioner defrosting method
CN111765675A (en) * 2020-06-24 2020-10-13 广东纽恩泰新能源科技发展有限公司 Air source heat pump defrosting system and method

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CN108800435A (en) * 2018-06-01 2018-11-13 青岛海尔空调器有限总公司 air conditioner defrosting control method
CN108800451A (en) * 2018-06-01 2018-11-13 青岛海尔空调器有限总公司 air conditioner defrosting control method
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CN110425686A (en) * 2019-08-09 2019-11-08 珠海格力电器股份有限公司 Air cooling module unit defrosting control method, computer installation and computer readable storage medium
CN110542175A (en) * 2019-09-06 2019-12-06 珠海格力电器股份有限公司 air conditioner defrosting method
CN111765675A (en) * 2020-06-24 2020-10-13 广东纽恩泰新能源科技发展有限公司 Air source heat pump defrosting system and method

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