CN106642790A - Air-conditioning system and control method - Google Patents

Air-conditioning system and control method Download PDF

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Publication number
CN106642790A
CN106642790A CN201611219510.3A CN201611219510A CN106642790A CN 106642790 A CN106642790 A CN 106642790A CN 201611219510 A CN201611219510 A CN 201611219510A CN 106642790 A CN106642790 A CN 106642790A
Authority
CN
China
Prior art keywords
air
gas
conditioning
temperature
compressor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611219510.3A
Other languages
Chinese (zh)
Inventor
胡朝发
韦汉儒
左先明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
Original Assignee
Midea Group Co Ltd
Guangdong Midea Refrigeration Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Midea Group Co Ltd, Guangdong Midea Refrigeration Equipment Co Ltd filed Critical Midea Group Co Ltd
Priority to CN201611219510.3A priority Critical patent/CN106642790A/en
Publication of CN106642790A publication Critical patent/CN106642790A/en
Pending legal-status Critical Current

Links

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
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/89Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • 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
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • 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

Abstract

The invention relates to an air-conditioning system and a control method. When an air conditioner runs in a refrigeration mode, the temperature T1 of an intake port of a compressor and the temperature T2 of an outlet of an indoor heat exchanger are monitored, and the difference value Delta T is calculated; wherein Delta T=T1-T2; and the abovementioned temperature difference value Delta T is compared with a preset temperature difference value T in the system, and a refrigerant is controlled to flow back into the compressor through a gas-liquid separator or not according to a comparison result. The control method for the air-conditioning system disclosed by the invention realizes that the refrigerant is capable of directly returning into the compressor through a bypass pipe in the case of being a superheated gas during a backflow process instead of passing through the gas-liquid separator, thus the pressure drop of the refrigerant is reduced, the refrigeration capacity of the air-conditioning system is improved, and the energy efficiency of the air-conditioning system is increased.

Description

A kind of air-conditioning system and control method
Technical field
The present invention relates to the control method of air-conditioning technical field, more particularly to a kind of air-conditioning system and its refrigerating capacity.
Background technology
At present many air-conditioner sets all can consider to arrange gas-liquid separator on muffler in the design, and air-conditioner is in operation In, according to the difference of operating condition, the amount for participating in the refrigerant of air-conditioning system operation is different, when in cryogenic refrigeration, low temperature system In the case that heat or refrigerant addition are more, substantial amounts of refrigerant is not joined in the tank body of gas-liquid separator with storage in liquid Plus heat exchange, can so there is problems with:Because a large amount of liquid refrigerants are stored in the tank body of the gas-liquid separator, liquid is cold Matchmaker is entered into the compressor, because compressor can with compressed gas, but cannot compressed liquid, thus incompressible liquid Body forms liquid hammer in the cylinder of compressor, damages the air valve of compressor, and then causes the damage of compressor to prevent in temperature too Substantial amounts of liquid refrigerants returns to compressor when low, causes " liquid hammer " phenomenon to occur, and damages compressor.
But after increasing gas-liquid separator gas, often increase drag losses when refrigerant return enters compressor, reduce return-air pressure Power, and then cause the reduction of cooling system amount.Shown according to experimental data, in specified cooling condition, increase gas-liquid separator Afterwards the refrigerating capacity of air-conditioning system can typically decline 1% or so.Therefore, gas-liquid separator how is reduced to air-conditioning system refrigerating capacity Impact is also one of problem of designers' primary study.
The content of the invention
(1) technical problem to be solved
The mesh of the present invention technical problem to be solved is air-conditioning when refrigeration mode is run, and gas-liquid separator can increase refrigerant and return Drag losses when flowing into compressor, reduces back pressure, and then causes the reduction of cooling system amount.
(2) technical scheme
In order to solve above-mentioned technical problem, the present invention there is provided a kind of air-conditioning system, connect into system including by pipeline Cold loop heats compressor, outdoor heat exchanger, orifice union and the indoor heat exchanger in loop;Also include gas-liquid separator, institute Air inlet of the gas-liquid separator located at the compressor is stated, the entrance of the gas-liquid separator is provided with the first electronic valve, is used for Control refrigerant enters the break-make of the gas-liquid separator;The gas-liquid separator is also parallel with bypass pipe, and the bypass pipe is arranged There is the second electronic valve, for controlling the break-make of bypass pipe.
Wherein, the air-conditioning system realizes refrigerating circuit and heats the switching in loop by cross valve.
Wherein, also including the first temperature sensor and second temperature sensor, the first temperature sensor is located at the compression At the air inlet of machine, for the temperature that monitoring enters compressor gas;The second temperature sensor is located at the room of refrigerating circuit The port of export of interior heat exchanger, for monitoring the port temperature of the indoor heat exchanger.
Wherein, the air-conditioning system is additionally provided with control device, the control device according to first temperature sensor and The difference of the temperature that the second temperature sensor is monitored controls the switch of first electronic valve and second electronic valve.
Wherein, the air-conditioning system is additionally provided with off-premises station high pressure valve and off-premises station low pressure valve.
Present invention also offers a kind of control method of air-conditioning system, comprises the following steps:
When air-conditioner start operation refrigeration mode, the temperature T1 and indoor heat exchanger outlet of compressor inlet is monitored Temperature T2 simultaneously calculates its difference △ T;Wherein △ T=T1-T2;
Default temperature gap T-phase in said temperature difference △ T and system is compared, controlling refrigerant according to comparative result is It is no to be back in compressor by gas-liquid separator;
When preset temperature difference T>During △ T, refrigerant evaporation is judged not exclusively, refrigerant is gas-liquid mixed in reflux course Thing, then controlled refrigerant and be back in compressor by gas-liquid separator;
As preset temperature difference T≤△ T, refrigerant evaporation is judged completely, refrigerant is overheated gas in reflux course, then Control refrigerant is not passed straight back in compressor by gas-liquid separator.
Wherein, when air-conditioner just starts shooting operation refrigeration mode, first control refrigerant and compression is back to by gas-liquid separator In machine, temperature T2 of the temperature T1 and indoor heat exchanger outlet of compressor inlet is monitored afterwards.
(3) beneficial effect
The beneficial effect of air-conditioning system provided by the present invention and control method is, when air-conditioning system is freezed, leads to Cross the monitoring to temperature, so control when refrigerant in reflux course if during overheated gas, can directly be returned by bypass pipe Enter compressor, and need not move through gas-liquid separator, and then reduce refrigerant pressure drop, improve air-conditioning system refrigerating capacity and efficiency, and protect Card system run all right, reduces energy loss, beneficial to environmental protection, and improves Consumer's Experience.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of air-conditioning system of the present invention
Reference:1. compressor;2. cross valve;3. outdoor heat exchanger;4. gas-liquid separator;5. orifice union;6. room Interior heat exchanger;7. the first temperature sensor;8. second temperature sensor;9. control device;10. the first electronic valve;11. second is electric Sub- valve;12. off-premises station high pressure valves;13. off-premises station low pressure valves.
Specific embodiment
With reference to Figure of description and embodiment, the specific embodiment of the present invention is described in further detail.With Lower embodiment is merely to illustrate the present invention, but can not be used for limiting the scope of the present invention.
As shown in figure 1, the air-conditioning system of the present invention, including connecting into refrigerating circuit or heat the compressor 1 in loop, outdoor Heat exchanger 3, orifice union 5, gas-liquid separator 4 and indoor heat exchanger 6;It is electric that the entrance of the gas-liquid separator 4 is provided with first Sub- valve 10, first electronic valve 10 is used to control refrigerant into the break-make of the gas-liquid separator 4;First electronic valve 10 One end connect the import of the gas-liquid separator 4, the other end is connected to the air inlet of the compressor 1 by bypass pipe;Its In, the bypass pipe is provided with the second electronic valve 11, and second electronic valve 11 is used to control the break-make of bypass pipe.
The air-conditioning system realizes refrigerating circuit and heats the switching in loop by cross valve 2.
The first temperature sensor 7 is provided with the air inlet of the compressor 1, first temperature sensor 7 is used to monitor Into the temperature of compressor gas.
The port that the indoor heat exchanger 6 is connected with the gas-liquid separator 4 is provided with second temperature sensor 8, described Second temperature sensor 8 is used to monitor the port temperature of the indoor heat exchanger 6.
The air-conditioning system is additionally provided with control device 9, and the control device 9 is according to first temperature sensor 7 and institute State difference control first electronic valve 10 of the temperature that second temperature sensor 8 is monitored and opening for second electronic valve 11 Close.
The air-conditioning system is additionally provided with off-premises station high pressure valve 12 and off-premises station low pressure valve 13.
Present invention also offers a kind of control method of above-mentioned air-conditioning system, it is characterised in that comprise the following steps:
When air-conditioner runs refrigeration mode, the temperature of the temperature T1 and indoor heat exchanger outlet of the air inlet of compressor 1 is monitored Degree T2 simultaneously calculates its difference △ T;Wherein △ T=T1-T2;
Default temperature gap T-phase in said temperature difference △ T and system is compared, it is electric according to comparative result control first The switch of the electronic valve 11 of sub- valve 10 and second.
Wherein, when preset temperature difference T>During △ T, then not exclusively, refrigerant is that gas-liquid is mixed in reflux course to refrigerant evaporation Compound, the first electronic valve 10 is opened, the second electronic valve 11 is closed for control, and then control refrigerant is back to by gas-liquid separator 4 In compressor.
Wherein, as preset temperature difference T≤△ T, then completely, refrigerant was hot gas in reflux course to refrigerant evaporation Body, the first electronic valve 10 is closed, the second electronic valve 11 is opened for control, and then control refrigerant is back to compressor 1 by bypass pipe In.
Wherein, when air-conditioner just starts shooting operation refrigeration mode, first control refrigerant and compression is back to by gas-liquid separator In machine, temperature T2 of the temperature T1 and indoor heat exchanger outlet of compressor inlet is monitored afterwards.
Present invention also offers a kind of control method of above-mentioned air-conditioning system, comprises the following steps:
When air-conditioner start operation heating mode, the first electronic valve 10 is opened, close the second electronic valve 11, lead to refrigerant Cross gas-liquid separator to be back in compressor.
In an embodiment of the present invention, during air-conditioning system operation refrigeration mode, the cyclic process of cold-producing medium is:Cold-producing medium Jing Compressor 1 compresses, and flows through cross valve 2 and exchanges heat into outdoor heat exchanger 3, is changed into Jing orifice unions after middle temperature high-pressure refrigerant 5 get in heat exchange in heat exchanger 6, and the cold-producing medium Jing gas-liquid separators 4 after heat exchange back flow back into 1 compression in compressor.
Meanwhile, control device 9 controls the first temperature sensor 7 and second temperature sensor 8 monitors respectively the air inlet of compressor 1 Temperature T2 of the temperature T1 and indoor heat exchanger outlet of mouth simultaneously calculates its difference △ T;Wherein △ T=T1-T2;Said temperature is poor Default temperature gap T-phase compares in value △ T and system, when preset temperature difference T>During △ T, then refrigerant evaporation is not exclusively, cold Matchmaker is gas-liquid mixture in reflux course, and the first electronic valve 10 is opened, the second electronic valve 11 is closed for control, and then controls refrigerant It is back in compressor by gas-liquid separator 4;As preset temperature difference T≤△ T, then completely, refrigerant is being returned refrigerant evaporation It is overheated gas during stream, the first electronic valve 10 is closed, the second electronic valve 11 is opened for control, and then controls refrigerant by bypass Pipe is back in compressor 1, and continues to monitor air-conditioning system pressure, such loop control.
Further, before air-conditioning system brings into operation, need to set scheduled time T in controller0.Alternatively, make a reservation for Time can be the Default Value of air-conditioning system, it is also possible to be arranged by User Defined.Thus, when the air-conditioning system system of bringing into operation During chill formula, temperature T2 of the temperature T1 and indoor heat exchanger outlet of the air inlet of compressor 1 is opened Jing after the scheduled time and is calculated Its difference △ T;Wherein △ T=T1-T2;Default temperature gap T-phase in said temperature difference △ T and system is compared, according to Comparative result controls the switch of the first electronic valve 10 and the second electronic valve 11.Some specific embodiments of the invention, make a reservation for The span of time can be 0s -60s, and for example, the scheduled time can be 40s, by the scheduled time for setting 40s, can be with The rate of change for avoiding room temperature from starting when changing is too big, makes regulation of the air-conditioner to indoor temperature more gentle, so as in certain journey The comfort level of user is improved on degree.
Air-conditioning system provided by the present invention and its control method when refrigeration mode is run, by the monitoring to temperature, And then control when refrigerant in reflux course if during overheated gas, can directly back into compressor by bypass pipe, and need not Through gas-liquid separator, and then refrigerant pressure drop is reduced, improves air-conditioning system refrigerating capacity and efficiency, and ensure system run all right, Energy loss is reduced, beneficial to environmental protection, and Consumer's Experience is improve.
Embodiment of above is merely to illustrate the present invention, rather than limitation of the present invention.Although with reference to embodiment to this It is bright to be described in detail, it will be understood by those within the art that, technical scheme is carried out various combinations, Modification or equivalent, without departure from the spirit and scope of technical solution of the present invention, all should cover will in right of the invention Ask in the middle of scope.

Claims (9)

1. a kind of air-conditioning system, including connecting into refrigerating circuit by pipeline or heat compressor, outdoor heat exchanger, the section in loop Stream component and indoor heat exchanger;Characterized in that, also including gas-liquid separator, the gas-liquid separator is located at the compressor Air inlet, the entrance of the gas-liquid separator is provided with the first electronic valve, for controlling refrigerant into the gas-liquid separator Break-make;The gas-liquid separator is also parallel with bypass pipe, and the bypass pipe is provided with the second electronic valve, for controlling bypass pipe Break-make.
2. air-conditioning system according to claim 1, it is characterised in that the air-conditioning system is realized freezing back by cross valve Road and the switching for heating loop.
3. air-conditioning system according to claim 1, it is characterised in that also pass including the first temperature sensor and second temperature Sensor, first temperature sensor is located at the air inlet of the compressor, for the temperature that monitoring enters compressor gas; The second temperature sensor is located at the port of export of the indoor heat exchanger of refrigerating circuit, for monitoring the end of the indoor heat exchanger Temperature at mouthful.
4. air-conditioning system according to claim 3, it is characterised in that the air-conditioning system is additionally provided with control device, described Described in the difference control of the temperature that control device is monitored according to first temperature sensor and the second temperature sensor The switch of the first electronic valve and second electronic valve.
5. the air-conditioning system according to claim 1-4 any one, it is characterised in that the air-conditioning system is additionally provided with outdoor Machine high pressure valve and off-premises station low pressure valve.
6. a kind of control method of air-conditioning system, it is characterised in that comprise the following steps:
When air-conditioner runs refrigeration mode, temperature T2 of temperature T1 and indoor heat exchanger outlet of compressor inlet is monitored simultaneously Calculate its difference △ T;Wherein △ T=T1-T2;
Default temperature gap T-phase in said temperature difference △ T and system is compared, controls whether refrigerant leads to according to comparative result Cross gas-liquid separator to be back in compressor.
7. control method according to claim 6, it is characterised in that comprise the following steps:
When preset temperature difference T>During △ T, refrigerant evaporation is judged not exclusively, refrigerant is gas-liquid mixture in reflux course, then Control refrigerant is back in compressor by gas-liquid separator.
8. control method according to claim 6, it is characterised in that comprise the following steps:
As preset temperature difference T≤△ T, refrigerant evaporation is judged completely, refrigerant is overheated gas in reflux course, then control Refrigerant is not passed straight back in compressor by gas-liquid separator.
9. the control method according to claim 6-8 any one, it is characterised in that comprise the following steps:
When air-conditioner just starts shooting operation refrigeration mode, first control refrigerant and be back in compressor by gas-liquid separator, supervise afterwards Temperature T1 of measured compressed machine air inlet and temperature T2 of indoor heat exchanger outlet.
CN201611219510.3A 2016-12-26 2016-12-26 Air-conditioning system and control method Pending CN106642790A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611219510.3A CN106642790A (en) 2016-12-26 2016-12-26 Air-conditioning system and control method

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Application Number Priority Date Filing Date Title
CN201611219510.3A CN106642790A (en) 2016-12-26 2016-12-26 Air-conditioning system and control method

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107461843A (en) * 2017-07-05 2017-12-12 广东美的制冷设备有限公司 Air conditioner and its control method and device
CN107477821A (en) * 2017-07-26 2017-12-15 美的集团武汉制冷设备有限公司 Air-conditioning system, the control device of air-conditioning system and method
CN107843023A (en) * 2017-10-17 2018-03-27 天津城建大学 A kind of refrigerating machine device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2615599Y (en) * 2003-02-14 2004-05-12 清华同方人工环境有限公司 Low-temperature air-cooling heat pump machine set
EP2224187A3 (en) * 2004-10-18 2012-05-23 Mitsubishi Denki Kabushiki Kaisha Refrigeration/air conditioning equipment
CN204648732U (en) * 2015-05-28 2015-09-16 特灵空调系统(中国)有限公司 Air-conditioning refrigeration structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2615599Y (en) * 2003-02-14 2004-05-12 清华同方人工环境有限公司 Low-temperature air-cooling heat pump machine set
EP2224187A3 (en) * 2004-10-18 2012-05-23 Mitsubishi Denki Kabushiki Kaisha Refrigeration/air conditioning equipment
CN204648732U (en) * 2015-05-28 2015-09-16 特灵空调系统(中国)有限公司 Air-conditioning refrigeration structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107461843A (en) * 2017-07-05 2017-12-12 广东美的制冷设备有限公司 Air conditioner and its control method and device
CN107477821A (en) * 2017-07-26 2017-12-15 美的集团武汉制冷设备有限公司 Air-conditioning system, the control device of air-conditioning system and method
CN107843023A (en) * 2017-10-17 2018-03-27 天津城建大学 A kind of refrigerating machine device

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Application publication date: 20170510