CN102927715B - Multiple-on-line heat pump air-conditioning system and method for controlling multiple-on-line heat pump air-conditioning system - Google Patents

Multiple-on-line heat pump air-conditioning system and method for controlling multiple-on-line heat pump air-conditioning system Download PDF

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Publication number
CN102927715B
CN102927715B CN201210427743.8A CN201210427743A CN102927715B CN 102927715 B CN102927715 B CN 102927715B CN 201210427743 A CN201210427743 A CN 201210427743A CN 102927715 B CN102927715 B CN 102927715B
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Prior art keywords
heat exchanger
valve
electric expansion
expansion valve
indoor set
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CN102927715A (en
Inventor
刘敏
曹培春
李亚军
朱小磊
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN201210427743.8A priority Critical patent/CN102927715B/en
Priority to EP12887504.4A priority patent/EP2916082B1/en
Priority to PCT/CN2012/083981 priority patent/WO2014067129A1/en
Publication of CN102927715A publication Critical patent/CN102927715A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
    • F24F1/032—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing characterised by heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0234—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in series arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a multiple-on-line heat pump air-conditioning system and a method for controlling the multiple-on-line heat pump air-conditioning system. The method is that a confluence unit performs gas-liquid separation and compression to a refrigerant output by the third end of a changing-over unit and outputs the refrigerant to the first end of the changing-over unit; under the working conditions of refrigeration and cooling-free dehumidification, a refrigerant output by the second end of the changing-over unit is driven to flow through a first heat exchange unit, a second electronic expansion valve, a second heat exchanger, a third electronic expansion valve and a third heat exchanger, flows back to the fourth end of the changing-over unit through a first stop valve and then is output out of the third end; under a working condition of heating, a refrigerant output by the fourth end of the changing-over unit is driven to flow through the third heat exchanger, the third electronic expansion valve, the second heat exchanger and the second electronic expansion valve, flows back to the second end of the changing-over unit through a second stop valve and the first heat exchange unit and then is output from the third end. By applying the method, the system cost can be reduced, and the control accuracy of the multiple-on-line heat pump air-conditioning system can be improved.

Description

The method of multi-connected machine heat pump type air conditioning system and control multi-connected machine heat pump type air conditioning system
Technical field
The present invention relates to multi-gang air-conditioner control technology, particularly relate to a kind of method of multi-connected machine heat pump type air conditioning system and control multi-connected machine heat pump type air conditioning system.
Background technology
Along with improving constantly of people's living standard, by the system that installs an air-conditioner under inhabitation and office work environment, in order to promote the comfortableness of inhabitation and working environment, become the important selection that people improve comfortableness demand.Wherein, multi-connected machine heat pump air conditioner technology due to have control free, energy-efficient, be convenient to the advantages such as installation and maintenance, be central air-conditioning development an important directions.
Fig. 1 is existing multi-connected machine heat pump type air conditioning system structural representation.See Fig. 1, this multi-connected machine heat pump type air conditioning system is generally made up of one or more off-premises station 01, one or more indoor set 02, center-control network (CS-NET) 03, refrigerant line 04, branch pipe 05 and order wire 06, multiple stage off-premises station forms outdoor unit, center-control network is controlled outdoor unit by order wire, off-premises station is by refrigerant line and branch pipe, and branch pipe is connected with indoor set.Wherein,
Off-premises station is generally made up of outdoor heat exchanger, compressor and other refrigeration annex, and outdoor heat exchanger generally adopts heat exchange form that is air-cooled or water-cooled; Indoor set is made up of blower fan and heat exchanger etc., the general form adopting direct evaporation and heat-exchange.Compared with multiple stage domestic air conditioning, the off-premises station of multi-connected machine heat pump type air conditioning system shares, and effectively can reduce equipment cost, and the centralized management of each indoor set can be realized, an indoor set can be started separately run, also can start multiple stage indoor set simultaneously and run, make control more flexible.
When the indoor set of multi-connected machine heat pump type air conditioning system processes air, need to carry out regulation and control to the temperature and humidity of air, wherein, humid control difficulty is larger.Existing multi-connected machine heat pump type air conditioning system, adopt the cool-down dehumidification method that indoor humidity is controlled, but, adopt the method, on the one hand, excessive reduction wind pushing temperature causes multi-connected machine heat pump type air conditioning system energy consumption high and evaporating temperature reduces, and the reduction of evaporating temperature will cause multi-connected machine heat pump type air conditioning system Energy Efficiency Ratio to reduce; On the other hand, carry out cool-down dehumidification at plum rain season, by strong for the cold draft problem causing blowing, for avoiding cold draft problem strongly to the uncomfortable property that user causes, need to increase electrical heating wire at indoor set, with to air-supply heat temperature raising, further increase the energy consumption of multi-connected machine heat pump type air conditioning system.
When dehumidifying for avoiding multi-connected machine heat pump type air conditioning system, system power dissipation is higher, the technical problem that refrigeration performance is lower, prior art proposes one and improves one's methods, namely at the indoor set part increase heat exchanger again of multi-connected machine heat pump type air conditioning system, this again heat exchanger be actually a condenser, side heat exchanger is outdoor utilized to flow through the flow of refrigerant of the HTHP come through this heat exchanger again, thus heat is entered in return air, another part return air sends into indoor after being mixed by the return air heated with this part after evaporimeter cool-down dehumidification, thus the function that realization is not lowered the temperature, or, by developing special dehumidifying magnetic valve or increasing multiple magnetic valve to realize the function of not lowering the temperature.But this is improved one's methods needs additionally to increase heat exchanger again at indoor set on the one hand, makes system cost increase; On the other hand, adopt special dehumidifying magnetic valve or multiple magnetic valve, make the control difficulty of multi-connected machine heat pump type air conditioning system increase and control accuracy be difficult to be guaranteed.
Summary of the invention
Embodiments of the invention provide a kind of multi-connected machine heat pump type air conditioning system, reduce system cost, improve the control accuracy of multi-connected machine heat pump type air conditioning system.
Embodiments of the invention also provide a kind of method controlling multi-connected machine heat pump type air conditioning system, reduce system cost, improve the control accuracy of multi-connected machine heat pump type air conditioning system.
For achieving the above object, a kind of multi-connected machine heat pump type air conditioning system that the embodiment of the present invention provides, this system comprises: off-premises station and indoor set, wherein,
Off-premises station comprises: control unit, joining unit, switch unit and the first heat exchange unit;
Indoor set comprises: indoor fan, the second electric expansion valve, the second heat exchanger, the 3rd electric expansion valve and the 3rd heat exchanger;
Control unit, for when multi-connected machine heat pump type air conditioning system is in cooling condition, the First Heat Exchanger controlled in the first heat exchange unit is condenser, and the second heat exchanger in indoor set and the 3rd heat exchanger are evaporimeter; When multi-connected machine heat pump type air conditioning system is in heating condition, the First Heat Exchanger controlled in the first heat exchange unit is evaporimeter, and the second heat exchanger in indoor set and the 3rd heat exchanger are condenser; Multi-connected machine heat pump type air conditioning system be in not cool-down dehumidification operating mode time, control the First Heat Exchanger in the first heat exchange unit and the second heat exchanger in indoor set is condenser, the 3rd heat exchanger in indoor set is evaporimeter;
Switch unit, for be in when multi-connected machine heat pump type air conditioning system refrigeration and not cool-down dehumidification operating mode time, the first end controlling switch unit is communicated with the second end, 3rd end is communicated with the 4th end, first end receives the output of joining unit, export the first heat exchange unit to by the second end, the 4th termination receives the output of indoor set, by three-polar output to joining unit; When multi-connected machine heat pump type air conditioning system is in heating condition, the first end controlling switch unit is communicated with the 4th end, second end is communicated with the 3rd end, first end receives the output of joining unit, exported to the first end of indoor set by the 4th end, second termination receives the output of the first heat exchange unit, by three-polar output to joining unit;
Joining unit, for the cold-producing medium that exported by switch unit after gas-liquid separation and compression, exports switch unit to;
First heat exchange unit, flows through the First Heat Exchanger in the first heat exchange unit for drive chamber's outer air, and one end is connected with the second end of switch unit, and the other end is connected with the second end of indoor set;
One end of second electric expansion valve is connected with the other end of the second stop valve, and the other end is connected with one end of the second heat exchanger;
The other end of the second heat exchanger is connected with one end of the 3rd electric expansion valve;
The other end of the 3rd electric expansion valve is connected with one end of the 3rd heat exchanger;
The other end of the 3rd heat exchanger is connected with the other end of the first stop valve;
Indoor fan to be used in drive chamber return through the second heat exchanger and the 3rd heat exchanger.
Preferably, described switch unit comprises: four-way change-over valve and the first stop valve, wherein,
The first end of four-way change-over valve is connected with the output of joining unit, second end is connected with the input of the first heat exchange unit, 3rd end is connected with the input of joining unit, and the 4th end is connected with one end of the first stop valve, and the other end of the first stop valve is connected with the first end of indoor set.
Preferably, described joining unit comprises: compressor, check valve and gas-liquid separator, wherein,
The output of compressor is connected with the input of check valve, and the output of check valve is connected with the first end of four-way change-over valve, and the input of gas-liquid separator is connected with the 3rd end of four-way change-over valve, and the output of gas-liquid separator is connected with the input of compressor.
Preferably, described first heat exchange unit comprises: First Heat Exchanger, outside fan, the first electric expansion valve and the second stop valve, wherein,
One end of First Heat Exchanger is connected with the second end of four-way change-over valve, and the other end is connected with one end of the first electric expansion valve;
The other end of the first electric expansion valve is connected with one end of the second stop valve;
The other end of the second stop valve is connected with the second end of indoor set;
Outside fan is used for drive chamber's outer air and flows through First Heat Exchanger.
Preferably, described compressor is made up of one or more constant speed compressor, or is made up of variable speed compressor, or is combined by constant speed compressor and variable speed compressor and form.
Preferably,
Described outside fan is aerofoil fan;
Described indoor fan is centrifugal fan or perfusion fan.
Preferably, described First Heat Exchanger, the second heat exchanger and the 3rd heat exchanger are that aluminium foil copper tube with fins heat exchanger or aluminum fin decline channel heat exchanger.
Preferably, described second heat exchanger is in the top of the 3rd heat exchanger.
Preferably, described indoor set comprises further: the first temperature sensor, the second temperature sensor and three-temperature sensor, wherein,
First temperature sensor to be arranged between the second electric expansion valve and the second heat exchanger and on the refrigerant line of second heat exchanger one end;
Second temperature sensor to be arranged between the 3rd heat exchanger and the first stop valve and on the refrigerant line of the 3rd heat exchanger one end;
Three-temperature sensor to be arranged between the 3rd electric expansion valve and the 3rd heat exchanger and on the refrigerant line of the 3rd heat exchanger one end.
Preferably, cold-producing medium is discharged by exhaust outlet of compressor and is entered check valve, and the higher pressure refrigerant gas exported by check valve enters the first end of four-way change-over valve;
When multi-connected machine heat pump type air conditioning system be in refrigeration and not cool-down dehumidification operating mode time:
The first end of four-way change-over valve is communicated with the second end, 3rd end is communicated with the 4th end, cold-producing medium flows through the 4th end of the second end of four-way change-over valve, First Heat Exchanger, the first electric expansion valve, the second stop valve, the second electric expansion valve, the second heat exchanger, the 3rd electric expansion valve, the 3rd heat exchanger, the first stop valve, four-way change-over valve successively, then flows through from the 3rd end of four-way change-over valve the air entry that gas-liquid separator enters compressor;
When multi-connected machine heat pump type air conditioning system is in heating condition:
The first end of four-way change-over valve is communicated with the 4th end, second end is communicated with the 3rd end, cold-producing medium flows through the second end of the 4th end of four-way change-over valve, the first stop valve, the 3rd heat exchanger, the 3rd electric expansion valve, the second heat exchanger, the second electric expansion valve, the second stop valve, the first electric expansion valve, First Heat Exchanger, four-way change-over valve successively, then flows through from the 3rd end of four-way change-over valve the air entry that gas-liquid separator enters compressor.
Preferably,
Under cooling condition, first electric expansion valve and the 3rd electric expansion valve standard-sized sheet, second electric expansion valve throttling, First Heat Exchanger is condenser, second heat exchanger and the 3rd heat exchanger are evaporimeter, the low warm air that indoor set is sent is indoor refrigeration, and the valve opening of the second electric expansion valve is controlled by the difference of the second temperature sensor and the first temperature sensor collecting temperature;
Under not cool-down dehumidification operating mode, first electric expansion valve and the second electric expansion valve standard-sized sheet, 3rd electric expansion valve throttling, First Heat Exchanger and the second heat exchanger are condenser, 3rd heat exchanger is evaporimeter, the return air part flowing through indoor set is heated to be hot blast by the second heat exchanger, and another part, by the 3rd heat exchanger dehumidification cooling, sends into indoor after treated cold wind mixes with hot blast; The valve opening of the 3rd electric expansion valve is controlled by the difference of the second temperature sensor and three-temperature sensor collecting temperature;
Under heating condition, the 3rd electric expansion valve standard-sized sheet, the first electric expansion valve and the second electric expansion valve throttling, First Heat Exchanger is evaporimeter, and the second heat exchanger and the 3rd heat exchanger are condenser, and the high warm air that indoor set is sent is indoor heating; The valve opening of the second electric expansion valve is controlled by the condensation temperature of high-pressure refrigerant and the difference of the first temperature sensor collecting temperature.
Preferably, described indoor set comprises further: the 4th heat exchanger and the 5th heat exchanger, wherein,
Form one group of heat exchanger by the second heat exchanger and the 3rd heat exchanger, form another by the 4th heat exchanger and the 5th heat exchanger and organize heat exchanger, two groups of heat exchangers are connected by sheet metal component, form V-shape heat exchanger.
Preferably, the other end of described second heat exchanger is connected with one end of the 4th heat exchanger;
The other end of the 4th heat exchanger is connected with one end of the 3rd electric expansion valve;
The other end of the 3rd electric expansion valve is connected with one end of the 3rd heat exchanger;
The other end of the 3rd heat exchanger is connected with one end of the 5th heat exchanger;
The other end of the 5th heat exchanger is connected with the other end of the first stop valve, and the second temperature sensor to be arranged between the 5th heat exchanger and the first stop valve and on the refrigerant line of the 5th heat exchanger one end.
Preferably, under not cool-down dehumidification operating mode, cold-producing medium flows through the second electric expansion valve successively, second heat exchanger, 4th heat exchanger, 3rd electric expansion valve, 3rd heat exchanger and the 5th heat exchanger, second electric expansion valve standard-sized sheet and the 3rd electric expansion valve throttling, second heat exchanger and the 4th heat exchanger are condenser, 3rd heat exchanger and the 5th heat exchanger are evaporimeter, from the second heat exchanger outflow is hot blast, what the 3rd heat exchanger flowed out is cold wind, from the 4th heat exchanger outflow is hot blast, from the 5th heat exchanger outflow is cold wind, described hot blast and cold wind are mixed to form air-supply.
Preferably, described 3rd electric expansion valve is heating power expansion valve in parallel and magnetic valve, and the temperature-sensitive infantees of heating power expansion valve to be placed between the first stop valve and the 3rd heat exchanger and on the refrigerant line of the 3rd heat exchanger one end, wherein,
Corresponding 3rd electric expansion valve standard-sized sheet when magnetic valve is opened; Closed electromagnetic valve and thermal expansion valve regulation time corresponding 3rd electric expansion valve flow restriction control, the temperature that the valve opening of heating power expansion valve is recorded by temperature-sensitive bag controls.
Control a method for multi-connected machine heat pump type air conditioning system, the method comprises:
A, the joining unit of off-premises station receives the cold-producing medium of the three-polar output of switch unit, after carrying out gas-liquid separation and compression, exports the first end of switch unit to;
Judge the operating mode residing for multi-connected machine heat pump type air conditioning system:
B, if be in refrigeration and not cool-down dehumidification operating mode, the cold-producing medium that the second end driving switch unit to be connected with first end exports flows through the second electric expansion valve, the second heat exchanger, the 3rd electric expansion valve, the 3rd heat exchanger of the first heat exchange unit and indoor set successively, the first stop valve in switch unit flows back into the 4th end of switch unit, then from the three-polar output of switch unit;
C, if be in heating condition, the cold-producing medium that the 4th end driving switch unit to be connected with first end exports flows through the 3rd heat exchanger, the 3rd electric expansion valve, the second heat exchanger, second electric expansion valve of indoor set successively, the second end of switch unit is flow back into through the second stop valve of off-premises station and the first heat exchange unit, then from the three-polar output of switch unit.
Wherein,
Described switch unit comprises: four-way change-over valve and the first stop valve, wherein,
The first end of four-way change-over valve is connected with the output of joining unit, second end is connected with the input of the first heat exchange unit, 3rd end is connected with the input of joining unit, and the 4th end is connected with one end of the first stop valve, and the other end of the first stop valve is connected with the first end of indoor set;
Described joining unit comprises: compressor, check valve and gas-liquid separator, wherein,
The output of compressor is connected with the input of check valve, and the output of check valve is connected with the first end of four-way change-over valve, and the input of gas-liquid separator is connected with the 3rd end of four-way change-over valve, and the output of gas-liquid separator is connected with the input of compressor;
Described first heat exchange unit comprises: First Heat Exchanger, outside fan, the first electric expansion valve and the second stop valve, wherein,
One end of First Heat Exchanger is connected with the second end of four-way change-over valve, and the other end is connected with one end of the first electric expansion valve;
The other end of the first electric expansion valve is connected with one end of the second stop valve;
The other end of the second stop valve is connected with the second end of indoor set;
Outside fan is used for drive chamber's outer air and flows through First Heat Exchanger;
Described indoor set also comprises: for the indoor fan of return in drive chamber through the second heat exchanger and the 3rd heat exchanger.
Wherein, described step B comprises:
The first end of four-way change-over valve is communicated with the second end, 3rd end is communicated with the 4th end, cold-producing medium flows through the 4th end of the second end of four-way change-over valve, First Heat Exchanger, the first electric expansion valve, the second stop valve, the second electric expansion valve, the second heat exchanger, the 3rd electric expansion valve, the 3rd heat exchanger, the first stop valve, four-way change-over valve successively, then flows through from the 3rd end of four-way change-over valve the air entry that gas-liquid separator enters compressor;
Wherein, under cooling condition, first electric expansion valve and the 3rd electric expansion valve standard-sized sheet, second electric expansion valve throttling, First Heat Exchanger is condenser, second heat exchanger and the 3rd heat exchanger are evaporimeter, and the low warm air that indoor set is sent is indoor refrigeration, and the valve opening of the second electric expansion valve is controlled by the difference of the second temperature sensor and the first temperature sensor collecting temperature;
Under not cool-down dehumidification operating mode, first electric expansion valve and the second electric expansion valve standard-sized sheet, 3rd electric expansion valve throttling, First Heat Exchanger and the second heat exchanger are condenser, 3rd heat exchanger is evaporimeter, the return air part flowing through indoor set is heated to be hot blast by the second heat exchanger, and another part, by the 3rd heat exchanger dehumidification cooling, sends into indoor after treated cold wind mixes with hot blast; The valve opening of the 3rd electric expansion valve is controlled by the difference of the second temperature sensor and three-temperature sensor collecting temperature.
Wherein, described step C comprises:
The first end of four-way change-over valve is communicated with the 4th end, second end is communicated with the 3rd end, cold-producing medium flows through the second end of the 4th end of four-way change-over valve, the first stop valve, the 3rd heat exchanger, the 3rd electric expansion valve, the second heat exchanger, the second electric expansion valve, the second stop valve, the first electric expansion valve, First Heat Exchanger, four-way change-over valve successively, flow through gas-liquid separator from the 3rd end of four-way change-over valve again, enter the air entry of compressor;
Wherein, the 3rd electric expansion valve standard-sized sheet, the first electric expansion valve and the second electric expansion valve throttling, First Heat Exchanger is evaporimeter, and the second heat exchanger and the 3rd heat exchanger are condenser, and the high warm air that indoor set is sent is indoor heating; The valve opening of the second electric expansion valve is controlled by the condensation temperature of high-pressure refrigerant and the difference of the first temperature sensor collecting temperature.
As seen from the above technical solution, the method of a kind of multi-connected machine heat pump type air conditioning system that the embodiment of the present invention provides and control multi-connected machine heat pump type air conditioning system, the joining unit of off-premises station receives the cold-producing medium of the three-polar output of switch unit, after carrying out gas-liquid separation and compression, export the first end of switch unit to; Judge the operating mode residing for multi-connected machine heat pump type air conditioning system: if be in refrigeration and not cool-down dehumidification operating mode, the cold-producing medium that the second end driving switch unit to be connected with first end exports flows through the second electric expansion valve, the second heat exchanger, the 3rd electric expansion valve, the 3rd heat exchanger of the first heat exchange unit and indoor set successively, the first stop valve in switch unit flows back into the 4th end of switch unit, then from the three-polar output of switch unit; If be in heating condition, the cold-producing medium that the 4th end driving switch unit to be connected with first end exports flows through the 3rd heat exchanger, the 3rd electric expansion valve, the second heat exchanger, second electric expansion valve of indoor set successively, the second end of switch unit is flow back into through the second stop valve of off-premises station and the first heat exchange unit, then from the three-polar output of switch unit.Like this, indoor set and off-premises station all adopt electric expansion valve, without the need to developing special dehumidifying magnetic valve or increasing magnetic valve, thus reduce system cost, ensure that Systematical control precision, and reduce Systematical control difficulty.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.Apparently, the accompanying drawing in below describing is only some embodiments of the present invention, for those of ordinary skills, can also obtain other embodiment and accompanying drawing thereof according to these accompanying drawing illustrated embodiments.
Fig. 1 is existing multi-connected machine heat pump type air conditioning system structural representation.
Fig. 2 is embodiment of the present invention multi-connected machine heat pump type air conditioning system structural representation.
Fig. 3 is the indoor set operating diagram that the embodiment of the present invention realizes indoor not cool-down dehumidification.
Fig. 4 is another structural representation of embodiment of the present invention indoor set.
Fig. 5 is a structural representation again of embodiment of the present invention indoor set.
Fig. 6 is the method flow schematic diagram that the embodiment of the present invention controls multi-connected machine heat pump type air conditioning system.
Detailed description of the invention
Carry out clear, complete description below with reference to accompanying drawing to the technical scheme of various embodiments of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope that the present invention protects.
Existing multi-connected machine heat pump type air conditioning system, by increasing heat exchanger again, side heat exchanger is outdoor utilized to flow through the flow of refrigerant of the HTHP come through this heat exchanger again, thus heat is entered in return air, another part return air sends into indoor after being mixed by the return air heated with this part after evaporimeter cool-down dehumidification, thus realize the function of not cool-down dehumidification, system cost is increased; Or, by developing special dehumidifying magnetic valve or increasing multiple magnetic valve to realize the function of not cool-down dehumidification, not only increase cost, also make the control difficulty of multi-connected machine heat pump type air conditioning system increase and control accuracy be difficult to be guaranteed.
In the embodiment of the present invention, economically and control angle set out, design the high performance new indoor machine for multi-connected machine heat pump type air conditioning system, the multi-connected machine heat pump type air conditioning system possessing not cool-down dehumidification function is proposed, while ensureing multi-connected machine heat pump type air conditioning system Effec-tive Function, realize refrigeration, heat and the object of not cool-down dehumidification, meet the high-level demand of user.
The multi-connected machine heat pump type air conditioning system of the embodiment of the present invention, can meet the not cool-down dehumidification function of Summer Indoor refrigeration, winter heating and plum rain season.From the angle of economy, the indoor set that the embodiment of the present invention relates to is without the need to additionally increasing heat exchanger; Control difficulty angle from raising control accuracy and reduction, the indoor set that the embodiment of the present invention relates to and off-premises station all adopt electric expansion valve, therefore without the need to developing special dehumidifying magnetic valve or increasing magnetic valve.
Fig. 2 is embodiment of the present invention multi-connected machine heat pump type air conditioning system structural representation.See Fig. 2, this multi-connected machine heat pump type air conditioning system comprises: off-premises station 01 and indoor set 02, and wherein, off-premises station 01 is one or more, and indoor set 02 is one or more,
Preferably, indoor set 02 can be the indoor set comprising not cool-down dehumidification function that the embodiment of the present invention relates to, and also can be the indoor set that prior art adopts, and namely only possesses the indoor set of refrigeration and heat-production functions.
Off-premises station 01 comprises: control unit, joining unit, switch unit and the first heat exchange unit, wherein,
Control unit, for when multi-connected machine heat pump type air conditioning system is in cooling condition, the First Heat Exchanger 4 controlled in the first heat exchange unit is condenser, and the second heat exchanger 13 in indoor set 02 and the 3rd heat exchanger 14 are evaporimeter; When multi-connected machine heat pump type air conditioning system is in heating condition, the First Heat Exchanger 4 controlled in the first heat exchange unit is evaporimeter, and the second heat exchanger 13 in indoor set 02 and the 3rd heat exchanger 14 are condenser; Multi-connected machine heat pump type air conditioning system be in not cool-down dehumidification operating mode time, control First Heat Exchanger in the first heat exchange unit 4 and be condenser with the second heat exchanger 13 in indoor set 02, the 3rd heat exchanger 14 in indoor set 02 is evaporimeter;
Switch unit, for be in when multi-connected machine heat pump type air conditioning system refrigeration and not cool-down dehumidification operating mode time, the first end controlling switch unit is communicated with the second end, 3rd end is communicated with the 4th end, first end receives the output of joining unit, export the first heat exchange unit to by the second end, the 4th termination receives the output of indoor set, by three-polar output to joining unit; When multi-connected machine heat pump type air conditioning system is in heating condition, the first end controlling switch unit is communicated with the 4th end, second end is communicated with the 3rd end, first end receives the output of joining unit, exported to the first end of indoor set by the 4th end, second termination receives the output of the first heat exchange unit, by three-polar output to joining unit;
Joining unit, for the cold-producing medium that exported by switch unit after gas-liquid separation and compression, exports switch unit to;
First heat exchange unit, flows through the First Heat Exchanger 4 in the first heat exchange unit for drive chamber's outer air, one end is connected with the second end of switch unit, and the other end is connected with the second end of indoor set.
Wherein,
Switch unit comprises: four-way change-over valve 3 and the first stop valve 8, wherein,
The first end of four-way change-over valve 3 is connected with the output of joining unit, second end is connected with the input of the first heat exchange unit, 3rd end is connected with the input of joining unit, and the 4th end is connected with one end of the first stop valve 8, and the other end of the first stop valve 8 is connected with the first end of indoor set.
Joining unit comprises: compressor 1, check valve 2 and gas-liquid separator 7, wherein,
The output of compressor 1 is connected with the input of check valve 2, the output of check valve is connected with the first end of four-way change-over valve 3, the input of gas-liquid separator 7 is connected with the 3rd end of four-way change-over valve 3, and the output of gas-liquid separator 7 is connected with the input of compressor 1.
In the embodiment of the present invention, compressor 1 can be made up of one or more constant speed compressor, also can be made up of variable speed compressor, can also be combined form by constant speed compressor and variable speed compressor.
First heat exchange unit comprises: First Heat Exchanger 4, outside fan 5, first electric expansion valve 6 and the second stop valve 9, wherein,
One end of First Heat Exchanger 4 is connected with the second end of four-way change-over valve 3, and the other end is connected with one end of the first electric expansion valve 6;
The other end of the first electric expansion valve 6 is connected with one end of the second stop valve 9;
The other end of the second stop valve 9 is connected with the second end of indoor set;
Outside fan 5 flows through First Heat Exchanger 4 for drive chamber's outer air.
In the embodiment of the present invention, outside fan 5 is aerofoil fan, and by the rotation of outside fan 5, drive chamber's outer air flows through First Heat Exchanger 4.
Like this, off-premises station 01 comprises: compressor 1, check valve 2, four-way change-over valve 3, First Heat Exchanger 4, outside fan 5, first electric expansion valve 6, gas-liquid separator 7, first stop valve 8 and the second stop valve 9, wherein,
The output of compressor 1 is connected with one end of check valve 2, and input is connected with the output of gas-liquid separator 7;
The other end of check valve 2 is connected with the first end of four-way change-over valve 3;
Second end of four-way change-over valve 3 is connected with one end of First Heat Exchanger 4, and the 3rd end is connected with the input of gas-liquid separator 7, and the 4th end is connected with one end of the first stop valve 8;
The other end of First Heat Exchanger 4 is connected with one end of the first electric expansion valve 6;
The other end of the first electric expansion valve 6 is connected with one end of the second stop valve 9;
The other end of the first stop valve 8 exports the first end of off-premises station 02 to, and the other end of the second stop valve 9 exports the second end of off-premises station 02 to.
Indoor set 02 comprises: indoor fan 10, second electric expansion valve 11, second heat exchanger 13, the 3rd electric expansion valve 17 and the 3rd heat exchanger 14, wherein,
One end of second electric expansion valve 11 is connected with the other end of the second stop valve 9, and the other end is connected with one end of the second heat exchanger 13;
The other end of the second heat exchanger 13 is connected with one end of the 3rd electric expansion valve 17;
The other end of the 3rd electric expansion valve 17 is connected with one end of the 3rd heat exchanger 14;
The other end of the 3rd heat exchanger 14 is connected with the other end of the first stop valve 8;
Indoor fan 10 for return in drive chamber through the second heat exchanger 13 and the 3rd heat exchanger 14.
In the embodiment of the present invention, indoor fan 10 can be centrifugal fan or perfusion fan, and by the rotation of indoor fan 10, in drive chamber, return is through the second heat exchanger 13 and the 3rd heat exchanger 14.
First Heat Exchanger 4, second heat exchanger 13 and the 3rd heat exchanger 14 can to decline channel heat exchanger for aluminium foil copper tube with fins heat exchanger or aluminum fin.
Preferably, place at heat exchanger on the direction of (highly), the second heat exchanger 13 is in the top of the 3rd heat exchanger 14.
In practical application, also can by the connection of heat exchanger end face bend pipe with weld, a certain independent heat exchanger is made to be divided into upper and lower two parts, such as, by the connection of heat exchanger end face bend pipe with weld, the heat exchanger in indoor set can be divided into upper and lower two parts, i.e. the second heat exchanger 13 and the 3rd heat exchanger 14, that is, by the connection of heat exchanger end face bend pipe with weld, form the second heat exchanger 13 and the 3rd heat exchanger 14.
Preferably, indoor set can further include: the first temperature sensor 12, second temperature sensor 15 and three-temperature sensor 16, wherein,
First temperature sensor 12 to be arranged between the second electric expansion valve 11 and the second heat exchanger 13 and on the refrigerant line of second heat exchanger 13 one end;
Second temperature sensor 15 to be arranged between the 3rd heat exchanger 14 and the first stop valve 8 and on the refrigerant line of the 3rd heat exchanger 14 one end;
Three-temperature sensor 16 to be arranged between the 3rd electric expansion valve 17 and the 3rd heat exchanger 14 and on the refrigerant line of the 3rd heat exchanger 14 one end.
In the embodiment of the present invention, first temperature sensor 12, second temperature sensor 15 and three-temperature sensor 16 are respectively used to the temperature of perception position place refrigerant line, thus make the temperature that the electric expansion valve on corresponding refrigerant line perceives according to temperature sensor, adjust the valve opening of this electric expansion valve, realize refrigeration, heat and not cool-down dehumidification function.
Like this, indoor set 02 comprises: indoor fan 10, second electric expansion valve 11, first temperature sensor 12, second heat exchanger 13, the 3rd heat exchanger 14, second temperature sensor 15, three-temperature sensor 16 and the 3rd electric expansion valve 17, wherein,
One end of second electric expansion valve 11 is connected with one end of the second heat exchanger 13, first temperature sensor 12 is arranged between the second electric expansion valve 11 and the second heat exchanger 13 and on the refrigerant line of second heat exchanger 13 one end, the other end of the second electric expansion valve 11 is connected with the other end of the second stop valve 9;
The other end of the second heat exchanger 13 is connected with one end of the 3rd electric expansion valve 17;
The other end of the 3rd electric expansion valve 17 is connected with one end of the 3rd heat exchanger 14, and three-temperature sensor 16 to be arranged between the 3rd electric expansion valve 17 and the 3rd heat exchanger 14 and on the refrigerant line of the 3rd heat exchanger 14 one end;
The other end of the 3rd heat exchanger 14 is connected with the other end of the first stop valve 8, and the second temperature sensor 15 to be arranged between the 3rd heat exchanger 14 and the first stop valve 8 and on the refrigerant line of the 3rd heat exchanger 14 one end;
Indoor fan 10 for return in drive chamber through the second heat exchanger 13 and the 3rd heat exchanger 14.
Below the workflow of embodiment of the present invention multi-connected machine heat pump type air conditioning system is described in detail.
Cold-producing medium is discharged by compressor 1 exhaust outlet (output) and is entered check valve 2, and the higher pressure refrigerant gas exported by check valve 2 enters the first end of four-way change-over valve 3;
When multi-connected machine heat pump type air conditioning system be in refrigeration and not cool-down dehumidification operating mode time:
The first end of four-way change-over valve 3 is communicated with the second end, 3rd end is communicated with the 4th end, cold-producing medium flows through the 4th end of the second end of four-way change-over valve 3, First Heat Exchanger 4, first electric expansion valve 6, second stop valve 9, second electric expansion valve 11, second heat exchanger 13, the 3rd electric expansion valve 17, the 3rd heat exchanger 14, first stop valve 8, four-way change-over valve 3 successively, then flows through from the 3rd end of four-way change-over valve 3 air entry (input) that gas-liquid separator 7 enters compressor 1;
When multi-connected machine heat pump type air conditioning system is in heating condition:
The first end of four-way change-over valve 3 is communicated with the 4th end, second end is communicated with the 3rd end, cold-producing medium flows through the second end of the 4th end of four-way change-over valve 3, the first stop valve 8, the 3rd heat exchanger 14, the 3rd electric expansion valve 17, second heat exchanger 13, second electric expansion valve 11, second stop valve 9, first electric expansion valve 6, First Heat Exchanger 4, four-way change-over valve 3 successively, then flows through from the 3rd end of four-way change-over valve 3 air entry that gas-liquid separator 7 enters compressor 1.
For realize multi-connected machine heat pump type air conditioning system refrigeration, heat and not cool-down dehumidification function, under different operating mode the adjustment control method of each electric expansion valve and the workflow of each heat exchanger as follows:
Under cooling condition, first electric expansion valve 6 and the 3rd electric expansion valve 17 standard-sized sheet, second electric expansion valve 11 throttling, regulate the refrigerant flow flowed through, under this cooling condition, First Heat Exchanger 4 is condenser, second heat exchanger 13 and the 3rd heat exchanger 14 are evaporimeter, the low warm air that indoor set 02 is sent is indoor refrigeration, and the valve opening of the second electric expansion valve 11 passes through the difference of the second temperature sensor 15 and the first temperature sensor 12 collecting temperature, and namely vaporized temperature controls; Wherein,
SH=T 15-T 12
In formula,
SH is vaporized temperature, by the calculating of vaporized temperature, and control valve aperture;
T 15it is the temperature value that the second temperature sensor 15 gathers;
T 12it is the temperature value that the first temperature sensor 12 gathers.
Under heating condition, 3rd electric expansion valve 17 standard-sized sheet, first electric expansion valve 6 and the second electric expansion valve 11 throttling, the refrigerant flow that corresponding adjustment flows through, under this heating condition, First Heat Exchanger 4 is evaporimeter, and the second heat exchanger 13 and the 3rd heat exchanger 14 are condenser, and the high warm air that indoor set 02 is sent is indoor heating; The valve opening of the second electric expansion valve 11 is by the condensation temperature of high-pressure refrigerant and the difference of the first temperature sensor 12 collecting temperature, i.e. condensation degree of supercooling controls; Wherein,
SC=T c-T 12
In formula,
SC is condensation degree of supercooling;
T cfor the condensing temperature value of cold-producing medium;
T 12it is the temperature value that the first temperature sensor 12 gathers.
Not under cool-down dehumidification operating mode, first electric expansion valve 6 and the second electric expansion valve 11 standard-sized sheet, 3rd electric expansion valve 17 throttling, under this not cool-down dehumidification operating mode, First Heat Exchanger 4 and the second heat exchanger 13 are condenser, and the 3rd heat exchanger 14 is evaporimeter, the return air part flowing through indoor set 02 is heated to be hot blast by the second heat exchanger 13, another part, by the 3rd heat exchanger 14 dehumidification cooling, sends into indoor after treated cold wind mixes with hot blast, realizes indoor not cool-down dehumidification; The valve opening of the 3rd electric expansion valve 17 passes through the difference of the second temperature sensor 15 and three-temperature sensor 16 collecting temperature, and namely vaporized temperature controls.Wherein,
SH′=T 15-T 16
In formula,
SH ' is vaporized temperature;
T 15it is the temperature value that the second temperature sensor 15 gathers;
T 16it is the temperature value that three-temperature sensor 16 gathers.
Fig. 3 is the indoor set operating diagram that the embodiment of the present invention realizes indoor not cool-down dehumidification.See Fig. 3, second heat exchanger 13 is condenser, 3rd heat exchanger 14 is evaporimeter, indoor fan 10 starts, in drive chamber, return is through the second heat exchanger 13 and the 3rd heat exchanger 14, the return air flowing through indoor set 02 is made to form two parts return air, part return air is heated to be hot blast by the second heat exchanger 13, another part return air is by the 3rd heat exchanger 14 dehumidification cooling, then, send into indoor after the hot blast being added thermosetting by the second heat exchanger 13 mixes mutually with the cold wind formed by the 3rd heat exchanger 14 dehumidification cooling, thus realize indoor not cool-down dehumidification.
Fig. 4 is another structural representation of embodiment of the present invention indoor set.See Fig. 4, this embodiment is for optimizing embodiment, adopt two groups of heat exchangers, one group of heat exchanger is made up of the second heat exchanger 13 and the 3rd heat exchanger 14, another group heat exchanger is made up of the 4th heat exchanger 13 ' and the 5th heat exchanger 14 ', and these two groups of heat exchangers are connected by sheet metal component 20, form V-shape heat exchanger, thus heat exchange area can be strengthened in the indoor set confined space, improve multi-connected machine heat pump type air conditioning system refrigerating capacity, heating capacity and moisture removal.
Wherein, the other end of the second heat exchanger 13 is connected with one end of the 4th heat exchanger 13 ';
The other end of the 4th heat exchanger 13 ' is connected with one end of the 3rd electric expansion valve 17;
The other end of the 3rd electric expansion valve 17 is connected with one end of the 3rd heat exchanger 14, and three-temperature sensor 16 to be arranged between the 3rd electric expansion valve 17 and the 3rd heat exchanger 14 and on the refrigerant line of the 3rd heat exchanger 14 one end;
The other end of the 3rd heat exchanger 14 is connected with one end of the 5th heat exchanger 14 ';
The other end of the 5th heat exchanger 14 ' is connected with the other end of the first stop valve 8, and the second temperature sensor 15 to be arranged between the 5th heat exchanger 14 ' and the first stop valve 8 and on the refrigerant line of the 5th heat exchanger 14 ' one end.
In the embodiment of the present invention, at heat exchanger functionally, connected by refrigerant line, second heat exchanger 13 is identical with the 4th heat exchanger 13 ' function, 3rd heat exchanger 14 is identical with the 5th heat exchanger 14 ' function, that is, the second heat exchanger 13 and the 4th heat exchanger 13 ' are all condenser or are all evaporimeter, and the 3rd heat exchanger 14 and the 5th heat exchanger 14 ' are all evaporimeter or are all condenser.
For cold-producing medium during not cool-down dehumidification operating mode and air-supply cyclic process, in the diagram, cold-producing medium flows through the second electric expansion valve 11 successively, second heat exchanger 13, 4th heat exchanger 13 ', 3rd electric expansion valve 17, 3rd heat exchanger 14 and the 5th heat exchanger 14 ', under this operating mode, second electric expansion valve 11 standard-sized sheet and the 3rd electric expansion valve 17 throttling, second heat exchanger 13 and the 4th heat exchanger 13 ' are condenser, 3rd heat exchanger 14 and the 5th heat exchanger 14 ' are evaporimeter, return air is after treatment followed successively by hot blast under upper, cold wind, hot blast and cold wind, namely from the second heat exchanger 13 outflow is hot blast, what the 3rd heat exchanger 14 flowed out is cold wind, from the 4th heat exchanger 13 ' flow out for hot blast, from the 5th heat exchanger 14 ' flow out for cold wind, hot blast and cold wind are mixed to form air-supply.Like this, the mixing between the air-supply contributing to different temperatures, thus improve air-supply comfortableness and multi-connected machine heat pump type air conditioning system thermal performance.
In the present embodiment, in Fig. 3 and Fig. 4, the control law of each electric expansion valve is identical with Fig. 2.In Fig. 4, the second temperature sensor 15 is arranged between the first stop valve 8 and the 5th heat exchanger 14 ' and on the refrigerant line of the 5th heat exchanger 14 ' one end, other temperature sensor location is constant.
Fig. 5 is a structural representation again of embodiment of the present invention indoor set.See Fig. 5, with Fig. 3 unlike, heating power expansion valve 18 in parallel is adopted to replace the 3rd electric expansion valve 17 with magnetic valve 19, namely one end of heating power expansion valve 18 is connected with one end of magnetic valve 19, and be connected with the other end of the second heat exchanger 13, the other end of heating power expansion valve 18 is connected with the other end of magnetic valve 19, and be connected with one end of the 3rd heat exchanger 14, the temperature-sensitive bag 15 ' of heating power expansion valve to be arranged between the first stop valve 8 and the 3rd heat exchanger 14 and on the refrigerant line of the 3rd heat exchanger 14 one end.
In the embodiment of the present invention, under different operating mode, each heat exchanger function is identical with middle corresponding heat exchanger function embodiment illustrated in fig. 2, and in two embodiments (Fig. 2 and Fig. 5), the first electric expansion valve 6 is also corresponding identical respectively with the control law of the second electric expansion valve 11.Unlike, in the present embodiment, adopt heating power expansion valve 18 in parallel to replace the 3rd electric expansion valve 17 with magnetic valve 19, its consistent relationship is as follows: corresponding 3rd electric expansion valve 17 standard-sized sheet when magnetic valve 19 is opened; Magnetic valve 19 cuts out and heating power expansion valve 18 regulates time corresponding 3rd electric expansion valve 17 flow restriction control, the temperature that the valve opening of heating power expansion valve 18 is recorded by temperature-sensitive bag 15 ' controls.
From above-mentioned, the multi-connected machine heat pump type air conditioning system of the embodiment of the present invention, off-premises station can share, and indoor set is without the need to additionally increasing heat exchanger again, connected by the bend pipe of heat exchanger end face in indoor set and weld, thus a heat exchanger is divided into upper and lower two parts, possess higher economy, thus effect reduces equipment cost, and the centralized management of each indoor set can be realized, indoor set can be started separately run, also can multiple stage indoor set startup optimization simultaneously, make to control more flexible; Indoor set can realize cooling in summer, winter heating and plum rain season not cool-down dehumidification function, thus improves air-supply comfortableness; Further, indoor set and the off-premises station of the embodiment of the present invention all adopt electric expansion valve, without the need to developing special dehumidifying magnetic valve or increasing magnetic valve, thus ensure that Systematical control precision, and reduce Systematical control difficulty.
Fig. 6 is the method flow schematic diagram that the embodiment of the present invention controls multi-connected machine heat pump type air conditioning system.See Fig. 6, this flow process comprises:
Step 601, the joining unit of off-premises station receives the cold-producing medium of the three-polar output of switch unit, after carrying out gas-liquid separation and compression, exports the first end of switch unit to;
In this step, switch unit comprises: four-way change-over valve and the first stop valve, wherein,
The first end of four-way change-over valve is connected with the output of joining unit, second end is connected with the input of the first heat exchange unit, 3rd end is connected with the input of joining unit, and the 4th end is connected with one end of the first stop valve, and the other end of the first stop valve is connected with the first end of indoor set;
Joining unit comprises: compressor, check valve and gas-liquid separator, wherein,
The output of compressor is connected with the input of check valve, and the output of check valve is connected with the first end of four-way change-over valve, and the input of gas-liquid separator is connected with the 3rd end of four-way change-over valve, and the output of gas-liquid separator is connected with the input of compressor.
Step 602, judges the operating mode residing for multi-connected machine heat pump type air conditioning system, if be in refrigeration and not cool-down dehumidification operating mode, performs step 603, if be in heating condition, performs step 604;
Step 603, the cold-producing medium that the second end driving switch unit to be connected with first end exports flows through the second electric expansion valve, the second heat exchanger, the 3rd electric expansion valve, the 3rd heat exchanger of the first heat exchange unit and indoor set successively, the first stop valve in switch unit flows back into the 4th end of switch unit, then from the three-polar output of switch unit;
In this step, the first heat exchange unit comprises: First Heat Exchanger, outside fan, the first electric expansion valve and the second stop valve, wherein,
One end of First Heat Exchanger is connected with the second end of four-way change-over valve, and the other end is connected with one end of the first electric expansion valve;
The other end of the first electric expansion valve is connected with one end of the second stop valve;
The other end of the second stop valve is connected with the second end of indoor set;
Outside fan is used for drive chamber's outer air and flows through First Heat Exchanger;
Indoor set also comprises: for the indoor fan of return in drive chamber through the second heat exchanger and the 3rd heat exchanger;
Like this, this step comprises:
The first end of four-way change-over valve is communicated with the second end, 3rd end is communicated with the 4th end, cold-producing medium flows through the 4th end of the second end of four-way change-over valve, First Heat Exchanger, the first electric expansion valve, the second stop valve, the second electric expansion valve, the second heat exchanger, the 3rd electric expansion valve, the 3rd heat exchanger, the first stop valve, four-way change-over valve successively, then flows through from the 3rd end of four-way change-over valve the air entry that gas-liquid separator enters compressor.
Wherein, under cooling condition, first electric expansion valve and the 3rd electric expansion valve standard-sized sheet, second electric expansion valve throttling, First Heat Exchanger is condenser, second heat exchanger and the 3rd heat exchanger are evaporimeter, and the low warm air that indoor set is sent is indoor refrigeration, and the valve opening of the second electric expansion valve is controlled by the difference of the second temperature sensor and the first temperature sensor collecting temperature.
Under not cool-down dehumidification operating mode, first electric expansion valve and the second electric expansion valve standard-sized sheet, 3rd electric expansion valve throttling, First Heat Exchanger and the second heat exchanger are condenser, 3rd heat exchanger is evaporimeter, the return air part flowing through indoor set is heated to be hot blast by the second heat exchanger, and another part, by the 3rd heat exchanger dehumidification cooling, sends into indoor after treated cold wind mixes with hot blast; The valve opening of the 3rd electric expansion valve is controlled by the difference of the second temperature sensor and three-temperature sensor collecting temperature.
Step 604, the cold-producing medium that the 4th end driving switch unit to be connected with first end exports flows through the 3rd heat exchanger, the 3rd electric expansion valve, the second heat exchanger, second electric expansion valve of indoor set successively, the second end of switch unit is flow back into through the second stop valve of off-premises station and the first heat exchange unit, then from the three-polar output of switch unit.
This step is specially:
The first end of four-way change-over valve is communicated with the 4th end, second end is communicated with the 3rd end, cold-producing medium flows through the second end of the 4th end of four-way change-over valve, the first stop valve, the 3rd heat exchanger, the 3rd electric expansion valve, the second heat exchanger, the second electric expansion valve, the second stop valve, the first electric expansion valve, First Heat Exchanger, four-way change-over valve successively, flow through gas-liquid separator from the 3rd end of four-way change-over valve again, enter the air entry of compressor.
Wherein, the 3rd electric expansion valve standard-sized sheet, the first electric expansion valve and the second electric expansion valve throttling, First Heat Exchanger is evaporimeter, and the second heat exchanger and the 3rd heat exchanger are condenser, and the high warm air that indoor set is sent is indoor heating; The valve opening of the second electric expansion valve is controlled by the condensation temperature of high-pressure refrigerant and the difference of the first temperature sensor collecting temperature.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if belong within the scope of the claims in the present invention and equivalent technologies thereof to these amendments of the present invention and modification, then the present invention also comprises these change and modification.

Claims (17)

1. a multi-connected machine heat pump type air conditioning system, is characterized in that, this system comprises: off-premises station and indoor set, wherein,
Off-premises station comprises: control unit, joining unit, switch unit and the first heat exchange unit, and wherein said first heat exchange unit has First Heat Exchanger;
Indoor set comprises: indoor fan, the second electric expansion valve, the second heat exchanger, the 3rd electric expansion valve, the 3rd heat exchanger, the 4th heat exchanger and the 5th heat exchanger;
Control unit, for when multi-connected machine heat pump type air conditioning system is in cooling condition, the First Heat Exchanger controlled in the first heat exchange unit is condenser, and the second heat exchanger in indoor set and the 3rd heat exchanger are evaporimeter; When multi-connected machine heat pump type air conditioning system is in heating condition, the First Heat Exchanger controlled in the first heat exchange unit is evaporimeter, and the second heat exchanger in indoor set and the 3rd heat exchanger are condenser; Multi-connected machine heat pump type air conditioning system be in not cool-down dehumidification operating mode time, control the First Heat Exchanger in the first heat exchange unit and the second heat exchanger in indoor set is condenser, the 3rd heat exchanger in indoor set is evaporimeter;
Switch unit, for be in when multi-connected machine heat pump type air conditioning system refrigeration and not cool-down dehumidification operating mode time, the first end controlling switch unit is communicated with the second end, 3rd end is communicated with the 4th end, first end receives the output of joining unit, export the first heat exchange unit to by the second end, the 4th termination receives the output of indoor set, by three-polar output to joining unit; When multi-connected machine heat pump type air conditioning system is in heating condition, the first end controlling switch unit is communicated with the 4th end, second end is communicated with the 3rd end, first end receives the output of joining unit, exported to the first end of indoor set by the 4th end, second termination receives the output of the first heat exchange unit, by three-polar output to joining unit;
Joining unit, for the cold-producing medium that exported by switch unit after gas-liquid separation and compression, exports switch unit to;
First heat exchange unit, flows through the First Heat Exchanger in the first heat exchange unit for drive chamber's outer air, and one end is connected with the second end of switch unit, and the other end is connected with the second end of indoor set;
One end of second electric expansion valve is connected with one end towards indoor set of the second stop valve, and the other end is connected with one end of the second heat exchanger;
Indoor fan to be used in drive chamber return through the second heat exchanger and the 3rd heat exchanger;
Form one group of heat exchanger by the second heat exchanger and the 3rd heat exchanger, form another by the 4th heat exchanger and the 5th heat exchanger and organize heat exchanger, two groups of heat exchangers are connected by sheet metal component, form V-shape heat exchanger;
The other end of described second heat exchanger is connected with one end of the 4th heat exchanger;
The other end of the 4th heat exchanger is connected with one end of the 3rd electric expansion valve;
The other end of the 3rd electric expansion valve is connected with one end of the 3rd heat exchanger;
The other end of the 3rd heat exchanger is connected with one end of the 5th heat exchanger;
The other end of the 5th heat exchanger is connected with one end exporting the first end of off-premises station to of the first stop valve, and the second temperature sensor to be arranged between the 5th heat exchanger and the first stop valve and on the refrigerant line of the 5th heat exchanger one end.
2. system according to claim 1, is characterized in that, described switch unit comprises: four-way change-over valve and the first stop valve, wherein,
The first end of four-way change-over valve is connected with the output of joining unit, second end is connected with the input of the first heat exchange unit, 3rd end is connected with the input of joining unit, and the 4th end is connected with one end of the first stop valve, and the other end of the first stop valve is connected with the first end of indoor set.
3. system according to claim 2, is characterized in that, described joining unit comprises: compressor, check valve and gas-liquid separator, wherein,
The output of compressor is connected with the input of check valve, and the output of check valve is connected with the first end of four-way change-over valve, and the input of gas-liquid separator is connected with the 3rd end of four-way change-over valve, and the output of gas-liquid separator is connected with the input of compressor.
4. system according to claim 3, is characterized in that, described first heat exchange unit comprises: First Heat Exchanger, outside fan, the first electric expansion valve and the second stop valve, wherein,
One end of First Heat Exchanger is connected with the second end of four-way change-over valve, and the other end is connected with one end of the first electric expansion valve;
The other end of the first electric expansion valve is connected with one end of the second stop valve;
The other end of the second stop valve is connected with the second end of indoor set;
Outside fan is used for drive chamber's outer air and flows through First Heat Exchanger.
5. system according to claim 4, is characterized in that, described compressor is made up of one or more constant speed compressor, or is made up of variable speed compressor, or is combined by constant speed compressor and variable speed compressor and form.
6. system according to claim 4, is characterized in that,
Described outside fan is aerofoil fan;
Described indoor fan is centrifugal fan or perfusion fan.
7. system according to claim 4, is characterized in that, described First Heat Exchanger, the second heat exchanger and the 3rd heat exchanger are that aluminium foil copper tube with fins heat exchanger or aluminum fin decline channel heat exchanger.
8. system according to claim 4, is characterized in that, described second heat exchanger is in the top of the 3rd heat exchanger.
9. the system according to any one of claim 1 to 8, is characterized in that, described indoor set comprises further: the first temperature sensor, the second temperature sensor and three-temperature sensor, wherein,
First temperature sensor to be arranged between the second electric expansion valve and the second heat exchanger and on the refrigerant line of second heat exchanger one end;
Second temperature sensor to be arranged between the 5th heat exchanger and the first stop valve and on the refrigerant line of the 5th heat exchanger one end;
Three-temperature sensor to be arranged between the 3rd electric expansion valve and the 3rd heat exchanger and on the refrigerant line of the 3rd heat exchanger one end.
10. the system according to claim 3-8, is characterized in that, cold-producing medium is discharged by exhaust outlet of compressor and entered check valve, and the higher pressure refrigerant gas exported by check valve enters the first end of four-way change-over valve;
When multi-connected machine heat pump type air conditioning system be in refrigeration and not cool-down dehumidification operating mode time:
The first end of four-way change-over valve is communicated with the second end, 3rd end is communicated with the 4th end, cold-producing medium flows through the 4th end of the second end of four-way change-over valve, First Heat Exchanger, the first electric expansion valve, the second stop valve, the second electric expansion valve, the second heat exchanger, the 4th heat exchanger, the 3rd electric expansion valve, the 3rd heat exchanger, the 5th heat exchanger, the first stop valve, four-way change-over valve successively, then flows through from the 3rd end of four-way change-over valve the air entry that gas-liquid separator enters compressor;
When multi-connected machine heat pump type air conditioning system is in heating condition:
The first end of four-way change-over valve is communicated with the 4th end, second end is communicated with the 3rd end, cold-producing medium flows through the second end of the 4th end of four-way change-over valve, the first stop valve, the 5th heat exchanger, the 3rd heat exchanger, the 3rd electric expansion valve, the 4th heat exchanger, the second heat exchanger, the second electric expansion valve, the second stop valve, the first electric expansion valve, First Heat Exchanger, four-way change-over valve successively, then flows through from the 3rd end of four-way change-over valve the air entry that gas-liquid separator enters compressor.
11. systems according to claim 10, is characterized in that,
Under cooling condition, first electric expansion valve and the 3rd electric expansion valve standard-sized sheet, second electric expansion valve throttling, First Heat Exchanger is condenser, second heat exchanger and the 3rd heat exchanger are evaporimeter, the low warm air that indoor set is sent is indoor refrigeration, and the valve opening of the second electric expansion valve is controlled by the difference of the second temperature sensor and the first temperature sensor collecting temperature;
Under not cool-down dehumidification operating mode, first electric expansion valve and the second electric expansion valve standard-sized sheet, 3rd electric expansion valve throttling, First Heat Exchanger, the second heat exchanger and the 4th heat exchanger are condenser, 3rd heat exchanger and the 5th heat exchanger are evaporimeter, the return air part flowing through indoor set is heated to be hot blast by the second heat exchanger and the 4th heat exchanger, and another part, by the 3rd heat exchanger and the 5th heat exchanger dehumidification cooling, sends into indoor after treated cold wind mixes with hot blast; The valve opening of the 3rd electric expansion valve is controlled by the difference of the second temperature sensor and three-temperature sensor collecting temperature;
Under heating condition, 3rd electric expansion valve standard-sized sheet, the first electric expansion valve and the second electric expansion valve throttling, First Heat Exchanger is evaporimeter, second heat exchanger, the 3rd heat exchanger, the 4th heat exchanger and the 5th heat exchanger are condenser, and the high warm air that indoor set is sent is indoor heating; The valve opening of the second electric expansion valve is controlled by the condensation temperature of high-pressure refrigerant and the difference of the first temperature sensor collecting temperature.
12. systems according to claim 1, it is characterized in that, under not cool-down dehumidification operating mode, cold-producing medium flows through the second electric expansion valve successively, second heat exchanger, 4th heat exchanger, 3rd electric expansion valve, 3rd heat exchanger and the 5th heat exchanger, second electric expansion valve standard-sized sheet and the 3rd electric expansion valve throttling, second heat exchanger and the 4th heat exchanger are condenser, 3rd heat exchanger and the 5th heat exchanger are evaporimeter, from the second heat exchanger outflow is hot blast, what the 3rd heat exchanger flowed out is cold wind, from the 4th heat exchanger outflow is hot blast, from the 5th heat exchanger outflow is cold wind, described hot blast and cold wind are mixed to form air-supply.
13. systems according to claim 9, it is characterized in that, described 3rd electric expansion valve is heating power expansion valve in parallel and magnetic valve, and the temperature-sensitive infantees of heating power expansion valve to be placed between the first stop valve and the 3rd heat exchanger and on the refrigerant line of the 3rd heat exchanger one end, wherein
Corresponding 3rd electric expansion valve standard-sized sheet when magnetic valve is opened; Closed electromagnetic valve and thermal expansion valve regulation time corresponding 3rd electric expansion valve flow restriction control, the temperature that the valve opening of heating power expansion valve is recorded by temperature-sensitive bag controls.
The method of 14. 1 kinds of control multi-connected machine heat pump type air conditioning systems as claimed in claim 1, the method comprises:
A, the joining unit of off-premises station receives the cold-producing medium of the three-polar output of switch unit, after carrying out gas-liquid separation and compression, exports the first end of switch unit to;
Judge the operating mode residing for multi-connected machine heat pump type air conditioning system:
B, if be in refrigeration and not cool-down dehumidification operating mode, the cold-producing medium that the second end driving switch unit to be connected with first end exports flows through the second electric expansion valve, the second heat exchanger, the 4th heat exchanger, the 3rd electric expansion valve, the 3rd heat exchanger, the 5th heat exchanger of the first heat exchange unit and indoor set successively, the first stop valve in switch unit flows back into the 4th end of switch unit, then from the three-polar output of switch unit;
C, if be in heating condition, the cold-producing medium that the 4th end driving switch unit to be connected with first end exports flows through the 5th heat exchanger, the 3rd heat exchanger, the 3rd electric expansion valve, the 4th heat exchanger, the second heat exchanger, second electric expansion valve of indoor set successively, the second end of switch unit is flow back into through the second stop valve of off-premises station and the first heat exchange unit, then from the three-polar output of switch unit.
15. methods according to claim 14, wherein,
Described switch unit comprises: four-way change-over valve and the first stop valve, wherein,
The first end of four-way change-over valve is connected with the output of joining unit, second end is connected with the input of the first heat exchange unit, 3rd end is connected with the input of joining unit, and the 4th end is connected with one end of the first stop valve, and the other end of the first stop valve is connected with the first end of indoor set;
Described joining unit comprises: compressor, check valve and gas-liquid separator, wherein,
The output of compressor is connected with the input of check valve, and the output of check valve is connected with the first end of four-way change-over valve, and the input of gas-liquid separator is connected with the 3rd end of four-way change-over valve, and the output of gas-liquid separator is connected with the input of compressor;
Described first heat exchange unit comprises: First Heat Exchanger, outside fan, the first electric expansion valve and the second stop valve, wherein,
One end of First Heat Exchanger is connected with the second end of four-way change-over valve, and the other end is connected with one end of the first electric expansion valve;
The other end of the first electric expansion valve is connected with one end of the second stop valve;
The other end of the second stop valve is connected with the second end of indoor set;
Outside fan is used for drive chamber's outer air and flows through First Heat Exchanger;
Described indoor set also comprises: for the indoor fan of return in drive chamber through the second heat exchanger, the 3rd heat exchanger, the 4th heat exchanger and the 5th heat exchanger.
16. methods according to claim 15, wherein, described step B comprises:
The first end of four-way change-over valve is communicated with the second end, 3rd end is communicated with the 4th end, cold-producing medium flows through the 4th end of the second end of four-way change-over valve, First Heat Exchanger, the first electric expansion valve, the second stop valve, the second electric expansion valve, the second heat exchanger, the 4th heat exchanger, the 3rd electric expansion valve, the 3rd heat exchanger, the 5th heat exchanger, the first stop valve, four-way change-over valve successively, then flows through from the 3rd end of four-way change-over valve the air entry that gas-liquid separator enters compressor;
Wherein, under cooling condition, first electric expansion valve and the 3rd electric expansion valve standard-sized sheet, second electric expansion valve throttling, First Heat Exchanger is condenser, second heat exchanger, the 3rd heat exchanger, the 4th heat exchanger and the 5th heat exchanger are evaporimeter, and the low warm air that indoor set is sent is indoor refrigeration, and the valve opening of the second electric expansion valve is controlled by the difference of the second temperature sensor and the first temperature sensor collecting temperature;
Under not cool-down dehumidification operating mode, first electric expansion valve and the second electric expansion valve standard-sized sheet, 3rd electric expansion valve throttling, First Heat Exchanger, the second heat exchanger and the 4th heat exchanger are condenser, 3rd heat exchanger and the 5th heat exchanger are evaporimeter, the return air part flowing through indoor set is heated to be hot blast by the second heat exchanger and the 4th heat exchanger, and another part, by the 3rd heat exchanger and the 5th heat exchanger dehumidification cooling, sends into indoor after treated cold wind mixes with hot blast; The valve opening of the 3rd electric expansion valve is controlled by the difference of the second temperature sensor and three-temperature sensor collecting temperature.
17. methods according to claim 15, wherein, described step C comprises:
The first end of four-way change-over valve is communicated with the 4th end, second end is communicated with the 3rd end, cold-producing medium flows through the second end of the 4th end of four-way change-over valve, the first stop valve, the 5th heat exchanger, the 3rd heat exchanger, the 3rd electric expansion valve, the 4th heat exchanger, the second heat exchanger, the second electric expansion valve, the second stop valve, the first electric expansion valve, First Heat Exchanger, four-way change-over valve successively, flow through gas-liquid separator from the 3rd end of four-way change-over valve again, enter the air entry of compressor;
Wherein, 3rd electric expansion valve standard-sized sheet, the first electric expansion valve and the second electric expansion valve throttling, First Heat Exchanger is evaporimeter, second heat exchanger, the 3rd heat exchanger, the 4th heat exchanger and the 5th heat exchanger are condenser, and the high warm air that indoor set is sent is indoor heating; The valve opening of the second electric expansion valve is controlled by the condensation temperature of high-pressure refrigerant and the difference of the first temperature sensor collecting temperature.
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