CN105588362A - Multi-split air-conditioning system and control method thereof - Google Patents

Multi-split air-conditioning system and control method thereof Download PDF

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Publication number
CN105588362A
CN105588362A CN201510756273.3A CN201510756273A CN105588362A CN 105588362 A CN105588362 A CN 105588362A CN 201510756273 A CN201510756273 A CN 201510756273A CN 105588362 A CN105588362 A CN 105588362A
Authority
CN
China
Prior art keywords
valve
electric expansion
expansion valve
indoor
refrigerant
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
CN201510756273.3A
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Chinese (zh)
Inventor
黄曙良
孙龙
何明顺
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.)
Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Original Assignee
Qingdao Hisense Hitachi Air Conditioning System 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.)
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Publication date
Application filed by Qingdao Hisense Hitachi Air Conditioning System Co Ltd filed Critical Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority to CN201510756273.3A priority Critical patent/CN105588362A/en
Publication of CN105588362A publication Critical patent/CN105588362A/en
Pending legal-status Critical Current

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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
    • F25B13/00Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B29/00Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • 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
    • F25B41/31Expansion 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
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • F25B41/34Expansion valves with the valve member being actuated by electric means, e.g. by piezo-electric actuators
    • 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
    • F25B41/385Dispositions with two or more expansion means arranged in parallel on a refrigerant line leading to the same evaporator
    • 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
    • F25B41/39Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • 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
    • F25B2313/00Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • 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, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02742Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way 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
    • F25B2600/00Control issues
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The embodiment of the invention provides a multi-split air-conditioning system and a control method of the system, and relates to the field of air conditioner control. The air-conditioning system can achieve refrigerating and heating at the same time. The multi-split air-conditioning system comprises at least one refrigerant switching device arranged between an indoor unit and an outdoor unit and two four-way valves arranged in the outdoor unit. Each refrigerant switching device comprises a first electronic expansion valve and a second electronic expansion valve; the first electronic expansion valves and the second electronic expansion valves are used for switching the flow direction of refrigerants; one end of each first electronic expansion valve is connected with a high pressure and low pressure switchable air pipe connected with the outdoor unit, and the other end of each first electronic expansion valve is connected with an indoor unit air pipe; one end of each second electronic expansion valve is connected with a low-pressure air pipe of the outdoor unit, and the other end of each second electronic expansion valve is connected with the indoor unit air pipe; and two four-way valves comprise a first four-way valve and a second four-way valve and are both connected with the refrigerant switching devices. The control method can be used for running of the multi-split air-conditioning system.

Description

A kind of multi-online air-conditioning system and control method thereof
Technical field
The present invention relates to air-conditioner control field, relate in particular to a kind of multi-online air-conditioning system and control thereofMethod.
Background technology
Multi-connected machine central air-conditioning is family by a type of central air-conditioning, is commonly called as " one drag many ", refer toBe that an off-premises station connects two or more indoor sets by pipe arrangement, outside adopts air-cooled heat exchangeForm, indoor adopt the primary coolant air-conditioning system of direct evaporation and heat-exchange form, i.e. multi-connected machine skyAdjusting system.
Conventionally, when user uses this multi-online air-conditioning system, in same multi-online air-conditioning system, instituteThere is the room that indoor apparatus of air conditioner is installed all freeze simultaneously or heat simultaneously. But,In some special occasion, same storied building may need refrigeration in some room, and other rooms need systemHeat. For example, the equipment room that heat dissipation capacity is large may need to freeze throughout the year, but because some is builtThe reason of building structure may need some room to heat. Like this, at current multi-online air-conditioning systemIndoor set or all carry out refrigerating operaton, or all carry out in the situation of heating operation, some needs systemThe special occasions that cold-peace heats operation simultaneously can not be met.
Summary of the invention
The embodiment of the present invention provides a kind of multi-online air-conditioning system and control method thereof, can realize air-conditioningSystem is freezed simultaneously and is heated.
First aspect, provides a kind of multi-online air-conditioning system, comprises indoor set and off-premises station, described chamberInterior machine comprises indoor heat exchanger, and described off-premises station comprises oil eliminator, gas-liquid separator, outdoor heat exchangeDevice, also comprises:
Be located at least one cooling medium switching device between described indoor set and described off-premises station, and be located atTwo cross valves in off-premises station;
Wherein, one end of arbitrary cooling medium switching device is connected in an indoor heat exchanger, and each refrigerant is cutChanging device comprises the first capillary, the first electric expansion valve and the second electric expansion valve, described first maoTubule is used for bypass refrigerant, and is connected in parallel in described the first electric expansion valve; Described the first electronics is swollenSwollen valve and the second electric expansion valve be all for switching the circulating direction of refrigerant, described the first electric expansion valveOne end connect the changeable tracheae of high-low pressure of described off-premises station, the other end connects indoor set tracheae, instituteOne end of stating the second electric expansion valve connects the low pressure gas pipe of described off-premises station, and the other end connects indoor setTracheae;
Described two cross valves comprise the first cross valve and the second cross valve, of described the first cross valveOne end is connected with the changeable tracheae of high-low pressure of described the first electric expansion valve, described the first cross valveThe second Duan mono-tunnel branch of the second Duan mono-tunnel branch and described the second cross valve all with described refrigerantThe low pressure gas pipe that the second electric expansion valve of switching device shifter connects described off-premises station connects, another road branchBe connected with gas-liquid separator, the 3rd end of described the first cross valve and the second end of the first cross valve pass throughThe second capillary connects, and the 3rd end of described the second cross valve and the second end of the second cross valve pass through theThree capillary connect, the 4th end of described the first cross valve and the 4th end of described the second cross valve all withOne end of described oil eliminator connects, and the first end of described the second cross valve and described outdoor heat exchanger connectConnect.
Second aspect, provides a kind of control method of multi-online air-conditioning system, is applied to first aspect instituteThe multi-online air-conditioning system of stating, described method comprises:
Receive the first instruction, described the first instruction is used to indicate the operation mould of described multi-online air-conditioning systemFormula;
Control cross valve in described multi-online air-conditioning system and cooling medium switching device according to described firstThe operational mode action of instruction instruction, described operational mode comprises complete refrigeration mode, heats mould completelyFormula, main body refrigeration mode and main body heating mode;
Wherein, described complete refrigeration mode characterizes all indoor sets in described multi-online air-conditioning system allCarry out refrigerating operaton, described complete heating mode characterizes all indoor in described multi-online air-conditioning systemMachine all enters heating operation, and the refrigeration that described main body refrigeration mode characterizes in described multi-online air-conditioning system is bornLotus is greater than and heats load, described main body heating mode characterize in described multi-online air-conditioning system heat negativeLotus is greater than cooling load.
The embodiment of the present invention provides a kind of multi-online air-conditioning system and control method thereof, this multi-gang air-conditionerIn system, include at least one cooling medium switching device of being located between indoor set and off-premises station, and be located atTwo cross valves in off-premises station, and each cooling medium switching device comprises the first electric expansion valve and secondElectric expansion valve; The first electric expansion valve and the second electric expansion valve are all for switching the circulation side of refrigerantTo, one end of the first electric expansion valve connects the changeable tracheae of high-low pressure of off-premises station, and the other end connectsIndoor set tracheae, one end of the second electric expansion valve connects the low pressure gas pipe of off-premises station, and the other end connectsIndoor set tracheae; Two cross valves comprise the first cross valve and the second cross valve, and all switch with refrigerantDevice connects; Like this, can be by the electronics in the valve commutation of control cross valve and cooling medium switching deviceOpening or closing of expansion valve, the trend of control refrigerant, like this when cross valve commutation makes refrigerant from chamberWhile entering the indoor heat exchanger being connected with off-premises station low pressure gas pipe after external heat exchanger heat release, can absorb heat, also canMake refrigerant enter by cross valve the cooling medium switching device being connected with off-premises station high-pressure air pipe and enter chamberInterior heat exchanger heat release, can realize the indoor heat exchanger heat release that a part is connected with cooling medium switching device that is,The indoor heat exchanger heat absorption that another part is connected with cooling medium switching device, has realized air-conditioning system and has made simultaneouslyCold-peace heats.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below will be to embodiment orIn description of the Prior Art, the accompanying drawing of required use is briefly described, apparently, belowAccompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain other according to these accompanying drawingsAccompanying drawing.
The structural representation of a kind of cooling medium switching device that Fig. 1 provides for the embodiment of the present invention;
The structural representation of a kind of cooling medium switching device that Fig. 2 provides for the embodiment of the present invention;
The structural representation of a kind of multi-online air-conditioning system that Fig. 3 provides for the embodiment of the present invention;
The flow process of the control method of a kind of multi-online air-conditioning system that Fig. 4 provides for the embodiment of the present inventionSchematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical scheme in the embodiment of the present inventionBe clearly and completely described, obviously, described embodiment is only that the present invention's part is realExecute example, instead of whole embodiment. Based on the embodiment in the present invention, ordinary skillPersonnel are not making the every other embodiment obtaining under creative work prerequisite, all belong to thisThe scope of invention protection.
The embodiment of the present invention provides a kind of multi-online air-conditioning system, comprises indoor set and off-premises station, indoorMachine comprises indoor heat exchanger, and off-premises station comprises oil eliminator, gas-liquid separator, outdoor heat exchanger, alsoInclude:
Be located at least one cooling medium switching device between indoor set and off-premises station, and be located in off-premises stationTwo cross valves;
Wherein, as shown in Figure 1, one end of arbitrary cooling medium switching device 11 (C end) is connected in a RoomInterior heat exchanger 12, and each cooling medium switching device 11 comprises the first electric expansion valve 111 and the second electricitySub-expansion valve 112; The first electric expansion valve 111 and the second electric expansion valve 112 are all cold for switchingMatchmaker's circulating direction, one end (A end) of the first electric expansion valve 111 connects the high-low pressure of off-premises stationChangeable tracheae, the other end (C end) connects indoor set tracheae, one of the second electric expansion valve 112End (B end) connects the low pressure gas pipe of off-premises station, and the other end (C end) connects indoor set tracheae;
Two cross valves comprise the first cross valve and the second cross valve, and all with cooling medium switching device 11Connect. Changeable tracheae (Fig. 1 of high-low pressure of the first end of the first cross valve and the first electric expansion valveMiddle A end place tracheae) connect, the second Duan mono-tunnel branch of the first cross valve and the second cross valveThe second Duan mono-tunnel branch is all connected the low of off-premises station with the second electric expansion valve of cooling medium switching deviceAir pipe (B end place tracheae in Fig. 1) connects, and another road branch is connected with gas-liquid separator, theThe 3rd end of one cross valve is connected by the second capillary with the second end of the first cross valve, the second four-wayThe 3rd end of valve is connected by three capillary with the second end of the second cross valve, of the first cross valveFour ends are all connected with one end of oil eliminator with the 4th end of the second cross valve, first of the second cross valveEnd is connected (specifically can referring to the connected mode in following Fig. 3) with outdoor heat exchanger.
Like this, can be by the electric expansion valve in the valve commutation of control cross valve and cooling medium switching deviceOpen or close, control the trend of refrigerant, like this when cross valve commutation makes refrigerant from outdoor heat exchangeWhile entering the indoor heat exchanger being connected with off-premises station low pressure gas pipe after device heat release, can absorb heat (for example, for figureCooling medium switching device 33 in 3, holds K end from the L of cross valve 36, and refrigerant is through outdoorAfter heat exchanger 38 heat releases, the electric expansion valve 41 through off-premises station absorbs heat in indoor heat exchanger 31 again again),Also can make refrigerant enter by cross valve the cooling medium switching device being connected with off-premises station high-pressure air pipe entersEnter indoor heat exchanger heat release (for example, for cooling medium switching device in Fig. 3 32, from cross valve 35G hold D end to hold and enter electric expansion valve 321 by high-pressure air pipe to A again, then change indoorHeat release in hot device 30), that is, can realize the indoor heat exchanger that a part is connected with cooling medium switching deviceHeat release, the indoor heat exchanger heat absorption that another part is connected with cooling medium switching device, has realized air-conditioning systemFreeze simultaneously and heat.
Because cooling medium switching device 11 is connected 12 with indoor heat exchanger, when multi-online air-conditioning system stopsWhen operation, have refrigerant and accumulate in indoor heat exchanger 12, therefore, the each refrigerant in the present inventionSwitching device shifter 11 also can include the first capillary 113, the first capillaries 113 for bypass refrigerant,And be parallel to the first electronic expansion pipe 111, like this, in the time that indoor set is out of service, accumulate in indoorRefrigerant in heat exchanger 12 can be recycled in compressor by the first capillary 113.
Particularly, for the concrete connection framework of this multi-online air-conditioning system, as shown in Figure 3, with thisIt is example that multi-online air-conditioning system has two indoor sets, can have so two cooling medium switching devices,Be designated as cooling medium switching device 32 and cooling medium switching device 33, also have two indoor heat exchangers, be designated asIndoor heat exchanger 30 and indoor heat exchanger 31.
Taking cooling medium switching device 32 as example, the first electric expansion valve 321 in this cooling medium switching device 32One end (A end) of the pipeline at place is connected first with the first end (D end) of the first cross valve 35The other end (C end) of electric expansion valve 321 place pipelines is connected with one end of indoor heat exchanger 30,One end (B end) of the second electric expansion valve 322 place pipelines is connected second with gas-liquid separator 34The other end (C end) of electric expansion valve 322 place pipelines is connected with one end of indoor heat exchanger 30;Similarly, one end (A of the pipeline at the first electric expansion valve 331 places in cooling medium switching device 33' end) be connected the first electric expansion valve 331 places with the first end (D end) of the first cross valve 35The other end (C end) of pipeline is connected with one end of indoor heat exchanger 31, the second electric expansion valve 332One end (B ' end) of place pipeline is connected with gas-liquid separator 34, the second 332 of electric expansion valvesThe other end (C end) at pipeline is connected with one end of indoor heat exchanger 31.
For two cross valves in this multi-online air-conditioning system, second of the first cross valve 35The second end (J end) Yi road branch of end (E end) Yi road branch and the second cross valve 36 all withCooling medium switching device 32 is connected another road with the second electric expansion valve (B end and B ' end) of 33Branch is connected with gas-liquid separator 34, the 3rd end (F end) of the first cross valve 35 and the first four-waySecond end (E end) of valve 35 connects by the second capillary (351), the of the second cross valve 36Three ends (H end) are connected by three capillary 352 with second end (J end) of the second cross valve 36,The 4th end (G end) of the first cross valve 35 and the 4th end (L end) of the second cross valve 36 all withOne end of oil eliminator 37 connects, first end (K end) and the outdoor heat exchange of the second cross valve (36)Device 38 connects.
For the remainder in this multi-online air-conditioning system, arbitrary indoor heat exchanger is connected with one and is positioned atElectric expansion valve in indoor set, the electric expansion valve being for example connected with indoor heat exchanger 30 in Fig. 339, the electric expansion valve 40 being connected with indoor heat exchanger 31, it is one outdoor that outdoor heat exchanger 38 is connected withThe electric expansion valve 41 of machine; The electric expansion valve of all indoor sets all connects with the electric expansion valve of off-premises stationConnect; Be the electric expansion valve 39 of indoor set and electric expansion valve 40 all with the electric expansion valve of off-premises station41 connect.
Oil eliminator 37 is all connected with one end of compressor 42 and one end of oil return capillary 43, pressesThe other end of contracting machine 42 is connected with gas-liquid separator 34, the other end of oil return capillary 43 and gas-liquidSeparator 34 connects.
Apply above-mentioned multi-online air-conditioning system, the embodiment of the present invention provides a kind of multi-online air-conditioning systemControl method, as shown in Figure 4, comprising:
401, receive the first instruction, determine the operational mode of multi-online air-conditioning system according to the first instruction;
In multi-online air-conditioning system, each indoor set is all corresponding exists one to be used to indicate indoor set fortuneRow controller, user can by this controller indicate its corresponding indoor set to heat or freeze orStartup or time-out etc., meanwhile, controller can send the indication information of the service requirement that characterizes userGive the unit master control set in off-premises station, first instruction is here with regard to this indication information of portability, unitThe operational mode of the multi-online air-conditioning system that master control set draws after calculating according to indication information, withBe convenient to each parts in unit master control set control multi-online air-conditioning system moves under this operational mode. ThisIn unit master control set can be single-chip microcomputer etc., the first instruction can be at least one, ought have manyThe controller of individual indoor set sends respectively different or identical the first instruction (the first instruction for example havingInstruction heats, and has the first instruction instruction refrigeration etc.) to after unit master control set, unit master control set is justCan calculate different operational modes.
Operational mode comprises complete refrigeration mode, complete heating mode, main body refrigeration mode and main body systemHeat pattern.
Wherein, all indoor sets that refrigeration mode characterizes in multi-online air-conditioning system completely all freezeOperation, all indoor sets that heating mode characterizes in multi-online air-conditioning system completely all enter heating operation,Main body refrigeration mode characterizes cooling load in multi-online air-conditioning system and is greater than and heats load, most ofIndoor set carries out refrigerating operaton, and small part indoor set carries out heating operation, and main body heating mode characterizes manyThe load that heats in online air-conditioning system is greater than cooling load, and most of indoor set heats fortuneOK, small part indoor set carries out refrigerating operaton.
402, the cross valve in control multi-online air-conditioning system and cooling medium switching device are according to definite fortuneRow mode operation.
When after the first instruction that unit master control set receives, can and control many according to the first command calculationsCross valve and cooling medium switching device in online air-conditioning system move.
1) if operational mode is complete refrigeration mode, control the cross valve in multi-online air-conditioning systemComprise according to definite operational mode operation with cooling medium switching device:
Control the valve commutation of the first cross valve and the second cross valve;
Control compressor and discharge refrigerant to oil eliminator, make refrigerant through warp again after oil eliminator processingThe second cross valve enters outdoor heat exchanger heat release, obtains refrigerant liquid, then passes through the electricity in off-premises stationElectric expansion valve in sub-expansion valve and indoor set obtains gas-liquid mixture and enters indoor heat exchanger suction againAfter heat, arrive cooling medium switching device;
The first electric expansion valve and the second electric expansion valve controlled in cooling medium switching device are opened, and makeGas-liquid mixture through the first electric expansion valve enters gas-liquid separator separates through the first cross valveLiquid refrigerants is also sucked by described compressor, and make the gas-liquid mixture through the second electric expansion valveEnter gas-liquid separator separates liquid refrigerants and sucked by compressor.
Exemplary, taking the multi-online air-conditioning system with two indoor sets shown in Fig. 3 as example, ifOperational mode is complete refrigeration mode, and first unit master control set can be controlled the D of the first cross valve 35End and E end communicate, and F end and G end communicate, and H end and the J end of the second cross valve 36 communicate, L endCommunicate with K end, then control refrigerant that compressor 42 discharges HTHP to oil eliminator 13, oilThe effect of separator is that the lubricating oil in the high steam that compressor is discharged separates, to ensure dressPut operation safely and efficiently. Like this, need to be by first through oil eliminator 13 refrigerant after treatmentCross valve 35 and the second cross valve 36, but because the first cross valve G end is connected with F end, F endBe connected by the second capillary 351 with E end again, under effect capillaceous, refrigerant can be cut off and pass through,Therefore, can only be by L end and the K of the second cross valve 36 through oil eliminator 13 refrigerant after treatmentEnd enters with K holds the outdoor heat exchanger 38 being connected, and the refrigerant of HTHP can be at outdoor heat exchanger 38Middle heat release, obtains refrigerant liquid, and this refrigerant liquid is the electronics through being connected with outdoor heat exchanger 38 againElectric expansion valve 39 and the electronic expansion of expansion valve 41 and the indoor set being connected with electric expansion valve 41Valve 40 carries out reducing pressure by regulating flow, obtains the gas-liquid mixture of low-temp low-pressure, gas-liquid mixture enter again withIndoor heat exchanger 30 and indoor heat exchanger 31 that the electric expansion valve of indoor set connects absorb heat,All indoor sets are all in refrigeration, and then, the gas-liquid mixture after absorption heat will enter refrigerant and cutChanging device 32 and cooling medium switching device 33, at this moment, unit master control set control cooling medium switching device 32All open with the electric expansion valve 321,322,331 and 332 in cooling medium switching device 33, like this,The gas-liquid mixture absorbing after heat will a part pass through the electronic expansion in cooling medium switching device 32In the A end of valve 321 and cooling medium switching device 33, the A ' end of electric expansion valve 331 enters the one or fourThe D end of logical valve, because D end communicates with E end, E end is connected with gas-liquid separator 34, therefore, thisPartially absorb gas-liquid mixture after heat and will be recycled to gas-liquid separator 34 and separate liquid refrigerants,Make compressor 42 can suck the refrigerant after gas-liquid separation, reach kind of refrigeration cycle; And after absorption heatAnother part gas-liquid mixture will be by cooling medium switching device 32 B end and cooling medium switching device33 B ' end directly enters gas-liquid separator 34 and carries out gas-liquid separation, and compressor 42 can be suckedRefrigerant after gas-liquid separation, reaches kind of refrigeration cycle.
2) if operational mode is complete heating mode, control the cross valve in multi-online air-conditioning systemComprise according to definite operational mode operation with cooling medium switching device:
Control the valve commutation of the first cross valve and the second cross valve;
Control compressor and discharge refrigerant to oil eliminator, make refrigerant through warp again after oil eliminator processingThe first cross valve enters cooling medium switching device;
Control the first electric expansion valve and second electric expansion valve of cooling medium switching device and open, make throughAfter crossing oil eliminator processing, refrigerant enters indoor heat exchanger heat release through cooling medium switching device, obtains high pressureSubcooled liquid, obtains gas-liquid through the electric expansion valve of indoor set and the electric expansion valve of off-premises station thenMixture enters outdoor heat exchanger heat absorption again, obtains overheated gas, then arrives gas through the second cross valveLiquid/gas separator separates liquid refrigerants and is sucked by compressor.
Exemplary, taking the multi-online air-conditioning system with two indoor sets shown in Fig. 3 as example, ifOperational mode is complete heating mode, and first unit master control set can be controlled the D of the first cross valve 35End communicates with G end, and F end communicates with E end, and the H end of the second cross valve 36 communicates with L end, J endCommunicate with K end, and then, control refrigerant that compressor 42 discharges HTHP to oil eliminator 37,After processing, oil eliminator 37 needs to enter into the first cross valve 35 and the second cross valve 36, due toL end and the H end of the second cross valve 36 communicate, and between H end and J end, have three capillary 352 to exist,Therefore, oil eliminator 37 refrigerant after treatment is not by the second cross valve 36, again due to the first four-wayG end and the D end of valve 35 communicate, and oil eliminator 37 refrigerant after treatment will be held and D end by GEnter the A end of cooling medium switching device 32 and the A ' end of cooling medium switching device 33, at this moment, unit masterControl device will be controlled electric expansion valve 321 and the cooling medium switching device 33 in cooling medium switching device 32In 331 open, oil eliminator 37 refrigerant after treatment will enter indoor heat exchanger 30 and indoorHeat exchanger 31 heat releases, to reach the effect heating, two indoor sets are all heating, and obtain heightPress subcooled liquid, then pass through the electric expansion valve 39 and 40 and outdoor electric expansion valve 41 of indoor setAfter reducing pressure by regulating flow, obtain the gas-liquid mixture of low-temp low-pressure, this gas-liquid mixture continues to enter and off-premises stationThe outdoor heat exchanger 38 that connects of electric expansion valve 41 absorb heat and become overheated gas and enter the two or fourThe K end of logical valve 36, K end is connected with J end, and J end is connected with gas-liquid separator 34 again, such mistakeHot gas will be by the air intake duct inhaling air liquid/gas separator 34 of gas-liquid separator, through gas-liquid separator34 separate the gas obtaining after liquid refrigerants will be sucked by compressor 42, and refrigerant is circulatedUtilize.
3) if operational mode is main body refrigeration mode, control the cross valve in multi-online air-conditioning systemComprise according to definite operational mode operation with cooling medium switching device:
Control the valve commutation of the first cross valve and the second cross valve;
Control compressor and discharge refrigerant to oil eliminator, make refrigerant while after oil eliminator is processedEnter the first cross valve and the second cross valve, then make through the refrigerant process of the second cross valve outdoorHeat exchanger heat release obtains high-pressure sub-cooled liquid, then passes through off-premises station electric expansion valve and the first indoor heat exchangeThe indoor set electric expansion valve that device connects obtains gas-liquid mixture and enters the first indoor heat exchange after processingDevice heat absorption, obtains overheated low-pressure gas and enters the first cooling medium switching device, the first cooling medium switching deviceBe connected with the first indoor heat exchanger, and make to enter the second refrigerant switching through the refrigerant of the first cross valveDevice, the second cooling medium switching device is connected with the second indoor heat exchanger;
The first electric expansion valve of controlling in the first cooling medium switching device is closed, and the second electric expansion valve is beatenOpen, make to enter through the overheated low-pressure gas of the second electric expansion valve in the first cooling medium switching deviceGas-liquid separator separates liquid refrigerants is also sucked by compressor, and control in the second cooling medium switching deviceThe first electric expansion valve is opened, and the second electric expansion valve is closed, and makes through the second cooling medium switching deviceIn the refrigerant of the first electric expansion valve enter the second indoor heat exchanger heat release and obtain high-pressure sub-cooled liquidAfter enter the first indoor heat exchanger through indoor set electric expansion valve.
Exemplary, taking the multi-online air-conditioning system with two indoor sets shown in Fig. 3 as example, ifOperational mode is main body refrigeration mode, freeze and heat simultaneously to exist, and cooling load is greater than and heatsLoad, so first unit master control set can be controlled the D end of the first cross valve 35 and G and holds and communicate, FEnd and E end communicate, and H end and the J end of the second cross valve 36 communicate, and K end and L end communicate, then,Unit master control set is controlled refrigerant that compressor 42 discharges HTHP again to oil eliminator 37, due toL end and the K end of the second cross valve 36 communicate, and oil eliminator 37 refrigerant after treatment will a partHold and K end enters outdoor heat exchanger 38 heat releases by L, obtain high-pressure sub-cooled liquid after emitting heat,After the electric expansion valve 41 of off-premises station and electric expansion valve 40 reducing pressure by regulating flows of indoor set, obtain againThe gas-liquid mixture of low-temp low-pressure, this gas-liquid mixture enters indoor heat exchanger 31 again and absorbs heat, to reachTo the effect of refrigeration, and obtain overheated low-pressure gas and enter cooling medium switching device 33, at this moment control refrigerantElectric expansion valve 331 in switching device shifter 33 is closed, and electric expansion valve 332 is opened, and crosses heat lowGas will directly enter gas-liquid separator 34 by electric expansion valve 332 and separate liquid refrigerants, andBy compressor, refrigerant after treatment is sucked; And the refrigerant of oil eliminator 37 HTHPs after treatmentAnother part will be by the first cross valve 35 G end and D hold and enter cooling medium switching device 32A end, and control electric expansion valve 321 and open, electric expansion valve 322 is closed, and passes through electronic expansionValve 321 enters indoor heat exchanger 30 heat releases, to reach the effect heating, then continues by electronics swollenSwollen valve 39, because electric expansion valve 40 ends are at this moment low pressure, so, by electric expansion valve 39Subcooled liquid out will with converge and enter indoor changing from the refrigerant of electric expansion valve 41 and 40 processesHot device 31 absorbs heat, and to reach the effect of refrigeration, refrigeration is strengthened, and like this, not only can makeObtain a part of indoor set refrigeration, a part of indoor set heats, and also can make refrigerant be circulated.
4) if operational mode is main body heating mode, control the cross valve in multi-online air-conditioning systemComprise according to definite operational mode operation with cooling medium switching device:
Control the valve commutation of the first cross valve and the second cross valve;
Control compressor discharge refrigerant and enter the first cross valve after oil eliminator post processing, make to enterThe refrigerant of the first cross valve enters the first cooling medium switching device, the first cooling medium switching device and first indoorHeat exchanger connects, and the first electric expansion valve of then controlling in the first cooling medium switching device is opened, and secondElectric expansion valve is closed, and makes by the refrigerant of the first electric expansion valve in the first cooling medium switching deviceEnter the first indoor heat exchanger heat release, obtain high-pressure sub-cooled liquid;
Control the 3rd indoor electronic expansion valve that is connected with the first indoor heat exchanger and with the second indoor changingThe quadrielectron expansion valve that hot device connects is opened, and makes high-pressure sub-cooled liquid pass through the 3rd electric expansion valveRear second indoor heat exchanger that simultaneously enters absorbs heat and enters outdoor heat exchanger heat absorption, obtains overheated low pressure gasBody;
When having served as heat low gas and having arrived the second cooling medium switching device being connected with the second indoor heat exchanger,Control that the first electric expansion valve in the second cooling medium switching device is closed, the second electric expansion valve is opened,Make to enter gas-liquid by the overheated low-pressure gas of the second electric expansion valve in the second cooling medium switching deviceSeparator separates liquid refrigerants and is sucked by compressor.
Exemplary, taking the multi-online air-conditioning system with two indoor sets shown in Fig. 3 as example, ifOperational mode is main body refrigeration mode, freezes and heats simultaneously to exist, and heat load and be greater than refrigerationLoad, first, the D of unit master control set control the first cross valve 35 end and G end communicate, E end withF end communicates, and H end and the L end of the second cross valve communicate, and J end and K end communicate, and then, controlCompressor 42 is discharged the refrigerant of HTHP and is processed to oil eliminator 37, due to L end and H endCommunicate, H end has again three capillary 352 to end with J end, and oil eliminator 37 is processed soAfter refrigerant will G end and D end by the first cross valve enter cooling medium switching device, at this moment controlThe electric expansion valve 321 of cooling medium switching device 32 is opened, and electric expansion valve 322 is closed, and electronics is swollenSwollen valve 331 cuts out, and electric expansion valve 332 is opened, and the refrigerant of HTHP will enter and pass through electronicsExpansion valve 321 enters indoor heat exchanger 30 heat releases, has reached the effect heating, and becomes high pressure excessively coldLiquid, then be divided into two-way after electric expansion valve 39, a road is through the electric expansion valve of off-premises station41 reducing pressure by regulating flows laggard enter outdoor heat exchanger 38 absorb heat, become overheated low-pressure gas, then through secondThe K end of cross valve enters after gas-liquid separator 34 separates liquid refrigerants and is sucked by compressor 42 with J end,To reach the effect of refrigerant circulation, another road enters chamber through the electric expansion valve 40 of another indoor setInterior heat exchanger 31 absorbs heat, and has arrived the effect of refrigeration, becomes overheated low-pressure gas, then enters refrigerantSwitching device shifter 33, and directly enter gas-liquid separator 34 by electric expansion valve 332 and separate liquid coldAfter matchmaker, being sucked by compressor 42, refrigerant is circulated, is to pass through for the refrigerant freezing hereThe indoor set heating transmits, and that is to say, in heating, through indoor heat exchanger 30 heat releasesAfter a wherein part can in indoor heat exchanger 31, absorb heat and freeze, heating load greatlyIn the situation of cooling load, realize refrigeration and heat operation simultaneously.
That is to say, when changes in temperature move, be equivalent to heat to turn from the space of needs refrigeration carrying out simultaneouslyMove on to the space that need to heat, can realize recuperation of heat, also reduced power consumption.
In addition, in the present invention, in cooling medium switching device, use electric expansion valve as refrigerant break-make use, andDo not use magnetic valve etc., can make to switch time, do not produce noise.
Therefore, the control method of the multi-online air-conditioning system in the embodiment of the present invention can realize multi-connected machine and dragsThe indoor set part refrigeration of band, part heats, and the indoor set heat of refrigeration can directly be transferred to and heatIndoor set, realize recuperation of heat, also saved power consumption, the effect that has promoted refrigeration and heated.
In the several embodiment that provide in the application, should be understood that, disclosed terminal and method,Can realize by another way. For example, device embodiment described above is only schematic. Another point, shown or discussed coupling each other or direct-coupling or communication connection are passableBe by some interfaces, INDIRECT COUPLING or the communication connection of device or unit, can be electrically, machineryOr other form.
The integrated unit that the above-mentioned form with SFU software functional unit realizes, can be stored in a calculatingIn machine read/write memory medium. Above-mentioned SFU software functional unit is stored in a storage medium, if compriseDry instruction is in order to make a computer equipment carry out the part of method described in each embodiment of the present inventionStep. And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only storage (Read-OnlyMemory, is called for short ROM), random access memory (RandomAccessMemory, be called for short RAM),The various media that can be program code stored such as magnetic disc or CD.
Finally it should be noted that: above embodiment is only in order to technical scheme of the present invention to be described, but not rightIts restriction; Although the present invention is had been described in detail with reference to previous embodiment, this area commonTechnical staff is to be understood that: its technical scheme that still can record aforementioned each embodiment is repaiiedChange, or part technical characterictic is wherein equal to replacement; And these amendments or replacement, noMake the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (10)

1. a multi-online air-conditioning system, comprises indoor set and off-premises station, and described indoor set comprises indoorHeat exchanger, described off-premises station comprises oil eliminator, gas-liquid separator, outdoor heat exchanger, it is characterized in that,Also comprise:
Be located at least one cooling medium switching device between described indoor set and described off-premises station, and be located at chamberTwo cross valves in outer machine;
Wherein, one end of arbitrary cooling medium switching device is connected in an indoor heat exchanger, and each refrigerant switchesDevice comprises the first electric expansion valve and the second electric expansion valve; Described the first electric expansion valve and the second electricitySub-expansion valve is all for switching the circulating direction of refrigerant, described in one end of described the first electric expansion valve connectsThe changeable tracheae of high-low pressure of off-premises station, the other end connects indoor set tracheae, described the second electric expansion valveOne end connect the low pressure gas pipe of described off-premises station, the other end connects indoor set tracheae;
Described two cross valves comprise the first cross valve and the second cross valve, first of described the first cross valveEnd is connected with the changeable tracheae of high-low pressure of described the first electric expansion valve, second of described the first cross valveDress is all switched with described refrigerant in the second Duan mono-tunnel branch of Duan mono-tunnel branch and described the second cross valveThe low pressure gas pipe that the second electric expansion valve of putting connects described off-premises station connects, and another road branch and gas-liquid are dividedConnect from device, the 3rd end of described the first cross valve and the second end of the first cross valve are by the second capillaryConnect, the 3rd end of described the second cross valve and the second end of the second cross valve connect by three capillaryConnect, the 4th end of described the first cross valve and the 4th end of described the second cross valve all with described oil eliminatorOne end connect, the first end of described the second cross valve is connected with described outdoor heat exchanger.
2. multi-online air-conditioning system according to claim 1, is characterized in that, described each coldMatchmaker's switching device shifter also includes respectively the first capillary, and described the first capillary is used for bypass refrigerant, and alsoBe coupled to described the first electric expansion valve.
3. multi-online air-conditioning system according to claim 1 and 2, is characterized in that,
One end of described the first electric expansion valve place pipeline is connected with one end of indoor heat exchanger, and describedOne end of two electric expansion valve place pipelines is connected with described gas-liquid separator, described the second electric expansion valveThe other end of place pipeline is connected with one end of described indoor heat exchanger.
4. multi-online air-conditioning system according to claim 1 and 2, is characterized in that, arbitrary chamberInterior heat exchanger is connected with an electric expansion valve that is arranged in indoor set, and described outdoor heat exchanger is connected with a RoomThe electric expansion valve of outer machine; The electric expansion valve of all indoor sets all with the electric expansion valve of described off-premises stationConnect;
Described oil eliminator is all connected with one end and oil return one end capillaceous of compressor, described compressorThe other end be connected with described gas-liquid separator, the described oil return other end capillaceous and described gas-liquid separationDevice connects.
5. a control method for multi-online air-conditioning system, is characterized in that, is applied to as claimMulti-online air-conditioning system described in 1 to 4 any one, described method comprises:
Receive the first instruction, determine the operation mould of described multi-online air-conditioning system according to described the first instructionFormula;
Control cross valve in described multi-online air-conditioning system and cooling medium switching device according to definite operationMode operation, described operational mode comprises complete refrigeration mode, complete heating mode, main body refrigeration modeWith main body heating mode;
Wherein, all indoor sets that described complete refrigeration mode characterizes in described multi-online air-conditioning system all enterRow refrigerating operaton, described complete heating mode characterizes all indoor sets in described multi-online air-conditioning system allEnter heating operation, the cooling load that described main body refrigeration mode characterizes in described multi-online air-conditioning system is greater thanHeat load, the load that heats that described main body heating mode characterizes in described multi-online air-conditioning system is greater than systemRefrigeration duty.
6. method according to claim 5, is characterized in that, if described operational mode is completeRefrigeration mode, the cross valve in the described multi-online air-conditioning system of described control and cooling medium switching device according toDefinite operational mode operation comprises:
Control the valve commutation of the first cross valve and the second cross valve;
Control compressor and discharge refrigerant to oil eliminator, make described refrigerant through described oil eliminator processingAfter enter outdoor heat exchanger heat release through the second cross valve again, obtain refrigerant liquid, then pass through in off-premises stationElectric expansion valve and indoor set in electric expansion valve obtain gas-liquid mixture and enter again indoor heat exchangerAfter heat absorption, arrive cooling medium switching device;
The first electric expansion valve and the second electric expansion valve controlled in described cooling medium switching device are opened, and makeMust enter gas-liquid separator through the first cross valve through the gas-liquid mixture of described the first electric expansion valveSeparate liquid refrigerants and sucked by described compressor, and making the gas-liquid through described the second electric expansion valveMixture enters described gas-liquid separator separates liquid refrigerants and is sucked by described compressor.
7. method according to claim 5, is characterized in that, if described operational mode is completeHeating mode, the cross valve in the described multi-online air-conditioning system of described control and cooling medium switching device according toDefinite operational mode operation comprises:
Control the valve commutation of the first cross valve and the second cross valve;
Control compressor and discharge refrigerant to oil eliminator, make described refrigerant through described oil eliminator processingAfter enter cooling medium switching device through the first cross valve again;
Control the first electric expansion valve and second electric expansion valve of described cooling medium switching device and open, makeAfter described oil eliminator is processed, refrigerant enters indoor heat exchanger heat release through described cooling medium switching device,Obtain high-pressure sub-cooled liquid, then obtain through the electric expansion valve of indoor set and the electric expansion valve of off-premises stationEnter again outdoor heat exchanger heat absorption to gas-liquid mixture, obtain overheated gas, then arrive through the second cross valveReach gas-liquid separator separates liquid refrigerants and sucked by described compressor.
8. method according to claim 5, is characterized in that, if described operational mode is main bodyRefrigeration mode, the cross valve in the described multi-online air-conditioning system of described control and cooling medium switching device according toDefinite operational mode operation comprises:
Control the valve commutation of the first cross valve and the second cross valve;
Control compressor and discharge refrigerant to oil eliminator, make described refrigerant through described oil eliminator processingRear the first cross valve and the second cross valve of simultaneously entering, makes the refrigerant process through the second cross valve thenOutdoor heat exchanger heat release obtains high-pressure sub-cooled liquid, then through off-premises station electric expansion valve and the first indoor changingThe indoor set electric expansion valve that hot device connects obtains gas-liquid mixture after processing and enters described first indoorHeat exchanger heat absorption, obtains overheated low-pressure gas and enters the first cooling medium switching device, and described the first refrigerant is cutChanging device is connected with described the first indoor heat exchanger, and makes to enter second through the refrigerant of the first cross valveCooling medium switching device, described the second cooling medium switching device is connected with the second indoor heat exchanger;
The first electric expansion valve of controlling in described the first cooling medium switching device is closed, the second electric expansion valveOpen, make the overheated low-pressure gas through the second electric expansion valve in described the first cooling medium switching deviceEnter gas-liquid separator separates liquid refrigerants and sucked by compressor, and controlling described the second refrigerant switching dressThe first electric expansion valve in putting is opened, and the second electric expansion valve is closed, and makes through described the second refrigerantThe refrigerant of the first electric expansion valve in switching device shifter enters described the second indoor heat exchanger heat release and obtains heightAfter pressing subcooled liquid, enter the first indoor heat exchanger through indoor set electric expansion valve.
9. method according to claim 5, is characterized in that, if described operational mode is main bodyHeating mode, the cross valve in the described multi-online air-conditioning system of described control and cooling medium switching device according toDefinite operational mode operation comprises:
Control the valve commutation of the first cross valve and the second cross valve;
Control compressor discharge refrigerant after oil eliminator post processing, enter described the first cross valve, make intoThe refrigerant that enters described the first cross valve enters the first cooling medium switching device, described the first cooling medium switching device withThe first indoor heat exchanger connects, and then controls the first electric expansion valve in described the first cooling medium switching deviceOpen, the second electric expansion valve is closed, and makes by the first electronics in described the first cooling medium switching deviceThe refrigerant of expansion valve enters the first indoor heat exchanger heat release, obtains high-pressure sub-cooled liquid;
Control the 3rd indoor electronic expansion valve that is connected with the first indoor heat exchanger and with the second indoor heat exchangeThe quadrielectron expansion valve that device connects is opened, and makes described high-pressure sub-cooled liquid swollen by described the 3rd electronicsAfter swollen valve, enter the second indoor heat exchanger heat absorption simultaneously and enter outdoor heat exchanger heat absorption, obtaining heat lowGas;
When arriving the second refrigerant being connected with described the second indoor heat exchanger, described overheated low-pressure gas switchesWhen device, control that the first electric expansion valve in described the second cooling medium switching device is closed, the second electronics is swollenSwollen valve is opened, and makes by the overheated low pressure gas of the second electric expansion valve in described the second cooling medium switching deviceBody enters gas-liquid separator separates liquid refrigerants and is sucked by described compressor.
10. according to the method described in claim 5-9 any one, it is characterized in that, if receive secondInstruction, it is out of service that described the second instruction is used for controlling described indoor set, closes described refrigerant and switch dressThe first electric expansion valve in putting and the second electric expansion valve, make the refrigerant in described indoor heat exchanger logicalCrossing described the first capillary is back in described compressor.
CN201510756273.3A 2015-11-09 2015-11-09 Multi-split air-conditioning system and control method thereof Pending CN105588362A (en)

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CN106288487A (en) * 2016-08-26 2017-01-04 芜湖美智空调设备有限公司 One drags many air-conditionings and control method thereof
CN106802008A (en) * 2017-01-16 2017-06-06 青岛海尔空调电子有限公司 Air-conditioner
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CN111237880A (en) * 2020-03-02 2020-06-05 青岛海信日立空调系统有限公司 Heat recovery multi-split air conditioner
CN112032912A (en) * 2020-08-17 2020-12-04 青岛海尔空调电子有限公司 Control method of multi-connected air conditioning system

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