CN106196684A - A kind of three multi-functional multi-connected air conditioning system of control and control methods thereof - Google Patents

A kind of three multi-functional multi-connected air conditioning system of control and control methods thereof Download PDF

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Publication number
CN106196684A
CN106196684A CN201610882830.0A CN201610882830A CN106196684A CN 106196684 A CN106196684 A CN 106196684A CN 201610882830 A CN201610882830 A CN 201610882830A CN 106196684 A CN106196684 A CN 106196684A
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China
Prior art keywords
machine room
compressor
vaporizer
indoor evaporator
condenser
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Granted
Application number
CN201610882830.0A
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Chinese (zh)
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CN106196684B (en
Inventor
王飞
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Priority to CN201610882830.0A priority Critical patent/CN106196684B/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
    • F25B7/00Compression machines, plant, or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
    • 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
    • F25B41/22Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
    • 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
    • F25B41/30Expansion means; Dispositions thereof
    • 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
    • F25B47/006Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
    • 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
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/007Compression machines, plant, or systems with reversible cycle not otherwise provided for three pipes connecting the outdoor side to the indoor side with multiple indoor units
    • 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
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/023Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units

Abstract

The invention belongs to air-conditioning technical field, disclose a kind of three multi-functional multi-connected air conditioning system of control and control methods thereof, system includes: compressor, condenser, machine room vaporizer, indoor evaporator, indoor evaporator, condenser the first end all by two branch roads respectively with suction port of compressor, outlet, first end of machine room vaporizer connects with the entrance of compressor, and the first end of machine room vaporizer is provided with the second throttling arrangement;Indoor evaporator, the second end of machine room vaporizer are equipped with first throttle device, and indoor evaporator, machine room vaporizer, the second end of condenser are interconnected.The present invention is by coupling multi-connected machine with air conditioner in machine room, and the two can work independently, and can dissolve the problems such as the operation of multi-connected machine Smaller load, lubrication, oil return, frosting defrosting, start and stop, reclaims machine room waste heat, saving space, reduces equipment cost;Second throttling arrangement makes machine room vaporizer have different evaporating temperatures from indoor evaporator, it is ensured that the refrigeration of machine room vaporizer.

Description

A kind of three multi-functional multi-connected air conditioning system of control and control methods thereof
Technical field
The present invention relates to air-conditioning technical field, particularly to a kind of three multi-functional multi-connected air conditioning system of control and controls thereof Method.
Background technology
With information industry digital Construction and the intelligentized fast development of household electrical appliances, machine room, the quantity of base station increase rapidly Add, owing to data center's sensible heat load is big, building enclosure is closed, so the air conditioning system of machine room, base station needs whole day throughout the year Wait refrigeration;Room air conditioning system is then mainly used in winter heating and cooling in summer, and machine room, the energy consumption of base station air conditioner account for according to statistics More than the 40% of its total energy consumption;Owing to existing machine room, base station being used for the air conditioning system of heat radiation and the operation of room air conditioning system Process is relatively independent;Waiting low temperature season in the winter time, room air conditioning system is mostly in and heats duty, and machine room is still in cooling Refrigerating state, it is impossible to accomplishing machine room waste heat recovery, two cover system costs are more expensive simultaneously, to there is also compressor low for room air conditioner simultaneously The dependability problems such as frequency operation, cold-starting, lubrication, energy adjustment, room air conditioner there is also frosting simultaneously, defrosting is asked Topic, is unfavorable for the market competition of product.
Summary of the invention
(1) to solve the technical problem that
The technical problem to be solved in the present invention is: be separately provided with air conditioner in machine room for solving existing indoor combined air conditioners, nothing Method reclaims machine room waste heat, room conditioning exists the problems such as use such as compressor low-frequency operation, cold-starting, lubrication, energy adjustment.
(2) technical scheme
In order to solve above-mentioned technical problem, the invention provides a kind of three multi-functional multi-connected air conditioning systems of control, including: Compressor, condenser, for the machine room vaporizer that the equipment of machine room or base station is persistently freezed and at least one for Indoor refrigeration or the indoor evaporator heated, described indoor evaporator, condenser the first end all valvular by two bands Branch road respectively with entrance, the outlet of described compressor, the first end of described machine room vaporizer and the entrance of described compressor Connection, the first end of described machine room vaporizer is provided with the second throttling arrangement;Described indoor evaporator, the second end of machine room vaporizer Being equipped with first throttle device, described indoor evaporator, machine room vaporizer, the second end of condenser are interconnected.
Wherein, the aperture scalable of described second throttling arrangement.
Wherein, the second end of described machine room vaporizer is provided with described first throttle device.
Wherein, the first end or second end of described machine room vaporizer is provided with valve.
Wherein, the second end of described condenser is provided with described first throttle device.
Wherein, described valve is electromagnetic valve.
Wherein, the entrance pipe of described compressor is provided with gas-liquid separator.
The present invention also disclosed the control method of the above three multi-functional multi-connected air conditioning system of control, by open or Close each described valve to adjust the flow direction of cold-producing medium, to realize following duty:
All refrigerating states: described compressor cold-producing medium out first passes through condenser heat rejection, then through described first segment Stream device respectively enters described machine room vaporizer, each indoor evaporator, eventually passes back in compressor;
Main body refrigerating state: described compressor cold-producing medium out first passes through condenser and part indoor evaporator is put Heat, then respectively enters described machine room vaporizer, remaining indoor evaporator through described first throttle device, eventually passes back to compression In machine;
Main body heats state: described compressor cold-producing medium out first passes through each indoor evaporator and carries out heat release, then warp Described first throttle device respectively enters described machine room vaporizer, condenser, eventually passes back in compressor;
Total heat recovery state: described compressor cold-producing medium out first passes through part indoor evaporator and carries out heat release, then Enter described machine room vaporizer through described first throttle device, eventually pass back in compressor.
Wherein, by regulating the aperture of described second throttling arrangement, indoor evaporator is made to obtain different from machine room vaporizer Evaporating temperature.
(3) beneficial effect
Technique scheme has the advantage that a kind of three multi-functional multi-connected air conditioning system of control and controls thereof of the present invention Method, by being coupled to being used for indoor refrigeration or the multi-connected air conditioning system that the heats refrigerated air-conditioning system with machine room or base station Together, it is achieved that the heat recovery at machine room vaporizer, it is to avoid frosting defrosting problem;Saving space and equipment, equipment cost is big Big reduction;The lasting refrigeration of machine room or base station can be realized, the duty of each indoor evaporator, each room can be adjusted again at any time The function such as interior vaporizer can realize heating, freezes, part refrigerating part heats, meets the demand of different user;Machine room evaporates Device is the most in running order, and indoor evaporator does not exist the problem such as cold-starting, lubrication when opening, and it also avoid compressor low The problem that frequency runs;The setting of the second throttling arrangement so that machine room vaporizer place pipeline and indoor evaporator pipeline have not Same pressure and evaporating temperature, it is ensured that the refrigeration of machine room vaporizer.
Accompanying drawing explanation
Fig. 1 is the structural representation of the three multi-functional multi-connected air conditioning systems of control of the present invention;
Fig. 2 is the fundamental diagram that air conditioning system of the present invention is in all refrigerating states;
Fig. 3 is the fundamental diagram that air conditioning system of the present invention is in main body refrigerating state;;
Fig. 4 is that air conditioning system of the present invention is in main body and heats the fundamental diagram of state;;
Fig. 5 is the fundamental diagram that air conditioning system of the present invention is in total heat recovery state;.
Wherein, 1, compressor;2, condenser;3, first throttle device;4, indoor evaporator;5, machine room vaporizer;6, Two throttling arrangements;7, electromagnetic valve;8, gas-liquid separator.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is described in further detail.Hereinafter implement Example is used for illustrating the present invention, but is not limited to the scope of the present invention.
In describing the invention, it should be noted that except as otherwise noted, " multiple " be meant that two or two with On;Term " on ", D score, "left", "right", " interior ", " outward ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " Or position relationship is based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, and It not to indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore It is not considered as limiting the invention.Additionally, term " first ", " second ", " the 3rd " etc. are only used for describing purpose, and can not It is interpreted as instruction or hint relative importance.
In describing the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " install ", " be connected ", " connection " should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or connect integratedly Connect;Can be to be mechanically connected, it is also possible to be electrical connection;Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary.Right For those of ordinary skill in the art, visual concrete condition understands above-mentioned term concrete meaning in the present invention.
Embodiment one:
As it is shown in figure 1, the present embodiment discloses a kind of three multi-functional multi-connected air conditioning systems of control, native system is by Interior Space Adjust and couple with air conditioner in machine room, constitute multi-joint structure, including: compressor 1, condenser 2, be used for the equipment of machine room or base station is carried out The machine room vaporizer 5 that persistently freezes and at least one is for indoor refrigeration or the indoor evaporator 4 that heats, described indoor steaming Send out device 4, condenser 2 the first end all by the two valvular branch roads of band respectively with the entrance of described compressor 1, outlet company Logical, the first end of described machine room vaporizer 5 connects with the entrance of described compressor 1, and the first end of described machine room vaporizer 5 is provided with Second throttling arrangement 6;Described indoor evaporator 4, the second end of machine room vaporizer 5 are equipped with first throttle device 3, described indoor Vaporizer 4, machine room vaporizer 5, the second end of condenser 2 are interconnected.
The present invention will be used for indoor refrigeration or the multi-connected air conditioning system heated and machine room or the refrigerated air-conditioning system of base station Being coupled together, save space and equipment, cost is greatly reduced;Can realize the lasting refrigeration of machine room or base station, again can be with Time adjust the duty of each indoor evaporator 4, each indoor evaporator 4 can realize heating, freezes, part refrigerating part heats Etc. function, meet the demand of different user;Such as relatively low when room temperature, when indoor need to heat, all indoor sets all use and heat Pattern, condenser 2 can according to circumstances freeze or heat;Under heating mode, when the cold of indoor heat demand with machine room When demand reaches balance, condenser 2 can be closed, only utilize indoor evaporator 4 to be circulated with machine room vaporizer 5, condenser 2 Fan, without startup, saves energy, it is achieved that energy regenerating, reduces the energy consumption of system under whole air-conditioning.Due to machine room vaporizer 5 The most in running order, there is not the problem such as cold-starting, lubrication when indoor evaporator 4 is opened, it also avoid compressor 1 low The problem that frequency runs;On the premise of ensureing that machine room vaporizer 5 persistently freezes, by regulation indoor evaporator 4 and condenser 2 Duty, can carry out defrosting operation, it is to avoid the generation of indoor evaporator 4 frost completely easily.Owing to machine room belongs to In persistently freezing, the evaporating temperature for machine room vaporizer 5 has special requirement, is therefore provided with the second throttling arrangement 6, so that Obtain machine room vaporizer 5 place pipeline, from indoor evaporator 4 pipeline, there is different pressure and evaporating temperature, it is ensured that machine room vaporizer The refrigeration of 5.If necessary, it is also possible to machine room vaporizer 5 first end is changed into by the branch road of two band valves respectively With entrance, the outlet of compressor 1, with facilitate the later stage use or safeguard.
Further, the aperture scalable of described second throttling arrangement 6.The i.e. pressure of machine room vaporizer 5 and evaporating temperature Can be adjusted at any time, to meet the use requirement of varying environment, it is ensured that the refrigeration of machine room vaporizer 5.
Further, the second end of described machine room vaporizer 5 is provided with described first throttle device 3.The of machine room vaporizer 5 One throttling arrangement 3 matches with the first throttle device 3 of upstream, it is achieved the purpose of reducing pressure by regulating flow, it is ensured that machine room vaporizer 5 Refrigeration.
Further, the first end or second end of described machine room vaporizer 5 is provided with valve.Arranging of valve can be in necessity Time disconnect the connection of machine room vaporizer 5 and compressor 1, conveniently carry out the operations such as maintenance.
Preferably, the second end of described condenser 2 is provided with described first throttle device 3, and this first throttle device 3 is with upper and lower The first throttle device 3 of trip matches, it is achieved the purpose of reducing pressure by regulating flow.
Preferably, described indoor evaporator 4 is two.Fig. 1 to Fig. 5 all as a example by two indoor evaporator 4, but this A simply preferred quantity, the quantity of indoor evaporator 4 can also is that three or more, specifically can enter according to actual needs Row is arranged, and i.e. uses the scheme of the indoor evaporator 4 of other quantity to fall within protection scope of the present invention.
Preferably, described valve is electromagnetic valve 7.Electromagnetic valve 7 can pass through the remote centralized Control of signal, easy switching.
Further, the entrance pipe of described compressor 1 is provided with gas-liquid separator 8.Gas-liquid separator 8 is possible to prevent liquid The cold-producing medium of state enters compressor 1, plays the purpose of protection compressor 1.
Embodiment two:
As shown in Figures 2 to 5, the present embodiment discloses the three multi-functional multi-connected air conditioning systems of control described in embodiment one Control method, by being turned on and off each described valve to adjust the flow direction of cold-producing medium, to realize following duty:
All refrigerating states: as in figure 2 it is shown, the cold-producing medium that described compressor 1 is out first passes through condenser 2 heat release, then Respectively enter described machine room vaporizer 5 through described first throttle device 3, each indoor evaporator 4 is freezed, and eventually passes back to compression In machine 1;In summer, indoor evaporator 4 needs refrigeration, and when machine room vaporizer 5 is also required to refrigeration, now air conditioning system runs entirety Refrigeration mode, the second throttling arrangement 6 of machine room vaporizer 5 first end can control room and realize different evaporation temperature from machine room Degree, thus meet the particular/special requirement of machine room refrigeration.
Main body refrigerating state: as it is shown on figure 3, the cold-producing medium that described compressor 1 is out first passes through condenser 2 and part is indoor Vaporizer 4 carries out heat release, and preceding sections indoor evaporator 4 heats, and then respectively enters institute through described first throttle device 3 State machine room vaporizer 5, remaining indoor evaporator 4 realizes machine room vaporizer 5 and freezes with part indoor evaporator 4, eventually passes back to In compressor 1;When temperature is relatively low, when indoor evaporator 4 need to heat, machine room vaporizer 5 need refrigeration time, and room demand When heat is less than machine room cold, system runs main body refrigeration mode;Meanwhile, indoor evaporator 4 part heats, part refrigeration, can To meet the use requirement of different body constitution crowd simultaneously.
Main body heats state: as shown in Figure 4, and described compressor 1 cold-producing medium out first passes through each indoor evaporator 4 to be carried out Heat release, then respectively enters described machine room vaporizer 5, condenser 2 through described first throttle device 3, eventually passes back to compressor 1 In;When indoor evaporator 4 need heat, machine room vaporizer 5 need refrigeration time, and room demand heat more than machine room cold time, System runs main body heating mode, and condenser 2 participates in the situation that cold release process is bigger to meet indoor heating demand.
Total heat recovery state: enter as it is shown in figure 5, the cold-producing medium that described compressor 1 is out first passes through part indoor evaporator 4 Row heat release, then enters described machine room vaporizer 5 through described first throttle device 3, eventually passes back in compressor 1.When indoor steaming Send out that device 4 needs to heat, machine room vaporizer 5 is when needing refrigeration, and when machine room refrigeration demand is identical with rooms demand, system fortune Row total heat recovery pattern;The most only needing actuating section indoor evaporator 4 to participate in circulation, condenser 2 is not involved in reaction, is realizing machine In the case of room refrigeration heats with indoor section, by the way of reclaiming machine room vaporizer 5 cold, ensure that Air-conditioning Cycle runs, if Standby startup amount is less, and electric quantity consumption is few, saves the energy.
Further, by regulating the aperture of described second throttling arrangement 6, indoor evaporator 4 is made to obtain with machine room vaporizer 5 Obtain different evaporating temperatures.So can be adjusted at any time, meet the refrigeration of machine room vaporizer 5 at a temperature of varying environment and want Ask, it is ensured that refrigeration.
On the whole, the invention have the advantages that
1, air conditioner in machine room is coupled with multi-connected machine, room refrigeration can be realized, heat, machine room, base can be met again The cooling requirement stood;Two set air conditioning systems are combined into a set of, and number of devices greatly reduces, and the space taken reduces the most significantly, reduces The equipment cost of cooling and warming;
2, when machine room refrigeration and room refrigeration, due to the requirement of machine room sensible heat ratio, arrange in machine room vaporizer 5 outlet Second throttling arrangement 6, it is possible to achieve the demand of different evaporating temperatures under two kinds of operating modes, ensures the cooling-down effect of machine room vaporizer 5.
3, machine room vaporizer 5 is continuously in running status, can avoid the wind of conventional multi-connected machine compressor 1 low-frequency operation Danger, and oil return difficulty etc. problem.
4, the waste heat reclaiming machine room winter heats, and can avoid frosting defrosting problem.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For Yuan, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and replacement, these improve and replace Also should be regarded as protection scope of the present invention.

Claims (9)

1. the multi-functional multi-connected air conditioning system of control, it is characterised in that including: compressor, condenser, for machine room Or the machine room vaporizer that persistently freezes of the equipment in base station and at least one is for indoor refrigeration or the indoor steaming that heats Send out device, described indoor evaporator, condenser the first end all by the two valvular branch roads of band respectively with described compressor Entrance, outlet, the first end of described machine room vaporizer connects with the entrance of described compressor, the of described machine room vaporizer One end is provided with the second throttling arrangement;Described indoor evaporator, the second end of machine room vaporizer are equipped with first throttle device, described Indoor evaporator, machine room vaporizer, the second end of condenser are interconnected.
2. air conditioning system as claimed in claim 1, it is characterised in that the aperture scalable of described second throttling arrangement.
3. air conditioning system as claimed in claim 2, it is characterised in that the second end of described machine room vaporizer is provided with described first Throttling arrangement.
4. air conditioning system as claimed in claim 3, it is characterised in that the first end or second end of described machine room vaporizer are provided with Valve.
5. air conditioning system as claimed in claim 1, it is characterised in that the second end of described condenser is provided with described first throttle Device.
6. air conditioning system as claimed in claim 1, it is characterised in that described valve is electromagnetic valve.
7. the air conditioning system as described in any one of claim 1-6, it is characterised in that the entrance pipe of described compressor is provided with Gas-liquid separator.
8., according to the control method of the three multi-functional multi-connected air conditioning systems of control described in any one of claim 1-7, its feature exists In, by being turned on and off each described valve to adjust the flow direction of cold-producing medium, to realize following duty:
All refrigerating states: described compressor cold-producing medium out first passes through condenser heat rejection, then fills through described first throttle Put and respectively enter described machine room vaporizer, each indoor evaporator, eventually pass back in compressor;
Main body refrigerating state: described compressor cold-producing medium out first passes through condenser and part indoor evaporator carries out heat release, Then respectively enter described machine room vaporizer, remaining indoor evaporator through described first throttle device, eventually pass back to compressor In;
Main body heats state: described compressor cold-producing medium out first passes through each indoor evaporator and carries out heat release, then through described First throttle device respectively enters described machine room vaporizer, condenser, eventually passes back in compressor;
Total heat recovery state: described compressor cold-producing medium out first passes through part indoor evaporator and carries out heat release, then through institute State first throttle device and enter described machine room vaporizer, eventually pass back in compressor.
9. control method as claimed in claim 8, it is characterised in that by regulating the aperture of described second throttling arrangement, make Indoor evaporator obtains different evaporating temperatures from machine room vaporizer.
CN201610882830.0A 2016-10-08 2016-10-08 The multi-functional multi-connected air conditioning system of three control of one kind and its control method Active CN106196684B (en)

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CN106907840A (en) * 2017-04-01 2017-06-30 青岛海尔空调器有限总公司 Air-conditioning refrigerator all-in-one and its progress control method
CN107023915A (en) * 2017-04-01 2017-08-08 青岛海尔空调器有限总公司 The progress control method of air-conditioning refrigerator all-in-one
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CN107023949A (en) * 2017-04-01 2017-08-08 青岛海尔空调器有限总公司 The progress control method of air-conditioning refrigerator all-in-one
CN107023916A (en) * 2017-04-01 2017-08-08 青岛海尔空调器有限总公司 The progress control method of air-conditioning refrigerator all-in-one
WO2019242264A1 (en) * 2018-06-20 2019-12-26 广东美的暖通设备有限公司 Three-pipe heat recovery multi-split system and control method therefor
CN110926072A (en) * 2019-11-21 2020-03-27 广东美的暖通设备有限公司 Multi-split air conditioning system and defrosting control method, control device and storage medium thereof

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