CN104748426A - Multi-split system - Google Patents
Multi-split system Download PDFInfo
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- CN104748426A CN104748426A CN201510150257.XA CN201510150257A CN104748426A CN 104748426 A CN104748426 A CN 104748426A CN 201510150257 A CN201510150257 A CN 201510150257A CN 104748426 A CN104748426 A CN 104748426A
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- indoor unit
- value
- line system
- heat
- flow arrangement
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- 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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- 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
- F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
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- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/23—Separators
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- 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
- F25B2600/00—Control issues
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- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2509—Economiser valves
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a multi-split system. The multi-split system comprises an outdoor unit device, a shunting device and multiple indoor unit devices; the shunting device comprises a gas-liquid separator, a first heat exchange assembly, a first electronic expansion valve, a second heat exchange assembly and a second electronic expansion valve. The shunting device controls the first electronic expansion valve according to a preset medium voltage initial control target value and obtains the supercooling degree values and superheat degree values of the heating indoor unit devices and opening degree values of throttling elements in all the indoor unit devices, and if the opening degree value of the throttling element in any indoor unit device reaches the maximum opening degree, the shunting device adjusts the current medium voltage control target value according to the supercooling degree values and the superheat degree values of the heating indoor unit devices. The multi-split system can automatically adjust the medium voltage control target value according to the state parameters of operating heating indoor units and operating refrigerating indoor units, so that the simultaneous refrigerating and heating effect of the multi-split system is optimal.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly a kind of multiple on-line system.
Background technology
Along with the development of air-conditioning technical and the reinforcement of people's environmental consciousness, heat-reclamation multi-compressors systems grow is subject to the welcome in market.And two-pipe heat-reclamation multi-compressors system is the one in the market in main flow heat-reclamation multi-compressors system, wherein, two-pipe heat-reclamation multi-compressors system can realize cooling and warming simultaneously, can reach good effect, needing to carry out middle pressure-controlled to part flow arrangement to make to heat machine in refrigeration.
And in correlation technique, strategy part flow arrangement being carried out to middle pressure-controlled is controlled according in certain value or certain limit the front and back pressure differential of the first electric expansion valve in part flow arrangement, this control strategy carries out according to the data that various simulated experiment obtains based on manufacturing firm often, adjustable range is not only limited, nor enough intelligence, be difficult to make system cloud gray model in preferably state.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technical problem.
For this reason, the object of the invention is to propose a kind of multiple on-line system, can automatically regulate pressure-controlled desired value in the first electric expansion valve according to the state parameter of machine in the state parameter heating interior machine run and refrigeration, thus cooling or heating effect is best simultaneously to reach multiple on-line system.
For achieving the above object, embodiments of the invention propose a kind of multiple on-line system, comprise off-premises station device, part flow arrangement, multiple indoor unit, wherein, described part flow arrangement comprises gas-liquid separator, first heat-exchanging component, first electric expansion valve, second heat-exchanging component and the second electric expansion valve, described part flow arrangement presses initial control objectives value to control described first electric expansion valve in presetting, and obtain the opening value of the restricting element in the super heat value of the degree of supercooling value that heats indoor unit in described multiple indoor unit and refrigeration indoor unit and each indoor unit respectively, if the opening value of the restricting element in any one indoor unit reaches maximum opening, described part flow arrangement according to described in heat indoor unit degree of supercooling value and refrigeration indoor unit super heat value current middle pressure-controlled desired value is adjusted.
According to the multiple on-line system of the embodiment of the present invention, first part flow arrangement presses initial control objectives value to control the first electric expansion valve in presetting, then the opening value of the restricting element in the super heat value of the degree of supercooling value that heats indoor unit in multiple indoor unit and refrigeration indoor unit and each indoor unit is obtained respectively, if the opening value of the restricting element in any one indoor unit reaches maximum opening, at this moment part flow arrangement adjusts current middle pressure-controlled desired value according to the super heat value of the degree of supercooling value and refrigeration indoor unit that heat indoor unit, therefore, it is possible to according to pressure-controlled desired value in the operational factor auto modification of the interior machine of operational factor and refrigeration heating interior machine to realize controlling the pressure difference value before and after the first electric expansion valve, all best with machine effect in the cooling and warming ensureing multiple on-line system.
According to one embodiment of present invention, if described in the opening value of restricting element that heats in indoor unit reach maximum opening and continue the first Preset Time, and described in heat indoor unit degree of supercooling value be greater than target degree of supercooling value, described part flow arrangement increases described current middle pressure-controlled desired value according to default step-length.
According to one embodiment of present invention, if the opening value of the restricting element in described refrigeration indoor unit reaches maximum opening and continue the first Preset Time, and the super heat value of described refrigeration indoor unit is greater than target superheat angle value, described part flow arrangement reduces described current middle pressure-controlled desired value according to default step-length.
Wherein, described first Preset Time is 2-4 minute, and described default step-length is 0.05-0.15Mpa.
According to one embodiment of present invention, described multiple on-line system is operated in main refrigeration mode.
According to one embodiment of present invention, in described multiple on-line system startup optimization second Preset Time, described part flow arrangement with described default in press initial control objectives value to control described first electric expansion valve.
Wherein, described second Preset Time is 10-20 minute.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the system schematic of multiple on-line system according to an embodiment of the invention;
Fig. 2 is system schematic when multiple on-line system runs on pure heating mode according to an embodiment of the invention;
Fig. 3 is system schematic when multiple on-line system runs on main heating mode according to an embodiment of the invention;
Fig. 4 is system schematic when multiple on-line system runs on pure refrigeration mode according to an embodiment of the invention;
Fig. 5 is schematic diagram when multiple on-line system runs on main refrigeration mode according to an embodiment of the invention; And
Fig. 6 is the communication network figure of multiple on-line system according to an embodiment of the invention.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
The multiple on-line system proposed according to the embodiment of the present invention is described with reference to the accompanying drawings.
As shown in Figures 1 to 5, the multiple on-line system of the embodiment of the present invention comprises: off-premises station device 10, and multiple indoor unit is four indoor units 21,22,23,24 such as, and part flow arrangement 30.
Wherein, off-premises station device 10 comprises compressor 101, cross valve 102, outdoor heat exchanger 103, outer machine gas-liquid separator 104, oil eliminator 105, first magnetic valve 106, capillary 107, four check valves 108A, 108B, 108C, 108D, and first interface 109 and the second interface 110.Compressor 101 has exhaust outlet and gas returning port, cross valve 102 has first to fourth valve port, first valve port is communicated with one of them in the 3rd valve port with the second valve port, 4th valve port and the second valve port are communicated with another in the 3rd valve port, first valve port is connected with the exhaust outlet of compressor 101 by oil eliminator 105,4th valve port is connected with the gas returning port of compressor 101 by outer machine gas-liquid separator 104, be in series with check valve 108A between second valve port and first interface 109, the 3rd valve port is connected with the first end of outdoor heat exchanger 103.
Part flow arrangement 30 comprises gas-liquid separator 301, multiple first control valve is four first control valves 302A, 302B, 302C, 302D such as, multiple second control valve is four second control valves 303A, 303B, 303C, 303D such as, first electric expansion valve 304A, second electric expansion valve 304B, four first check valves 305A, 305B, 305C, 305D, four second check valves 306A, 306B, 306C, 306D, the first heat-exchanging component 307A and the second heat-exchanging component 307B.Wherein, gas-liquid separator 301 has entrance, gas vent and liquid outlet, entrance is connected with the second end of outdoor heat exchanger 103 by high-pressure stop valve 40, check valve 108B, and gas vent is connected with four second control valves 303A, 303B, 303C, 303D respectively; Four first control valves 302A, 302B, 302C, 302D are connected with first interface 109 respectively by low-pressure shutoff valve 50.First heat-exchanging component 307A and the second heat-exchanging component 307B can be plate type heat exchanger, also can be double-tube heat exchanger.
As shown in Figures 1 to 5, the first end of check valve 108A is connected between check valve 108B and the second interface 110 by check valve 108C, and second end of check valve 108A is connected between check valve 108B and outdoor heat exchanger 103 by check valve 108D.
First heat-exchanging component 307A and the second heat-exchanging component 307B has the first heat exchange stream and the second heat exchange stream respectively, the liquid outlet of Gas and liquid flow diverter 301 is connected with the first heat exchange stream of the first heat-exchanging component 307A, the first heat exchange stream of the first heat-exchanging component 307A is connected with the first electric expansion valve 304A, and the second heat exchange stream of the first heat-exchanging component 307A is connected with four first control valves 302A, 302B, 302C, 302D with the second heat exchange stream of the second heat-exchanging component 307B respectively.
As shown in Figures 1 to 5, each indoor unit includes indoor heat exchanger and restricting element, wherein, indoor unit 21 comprises indoor heat exchanger 211 and restricting element 212, indoor unit 22 comprises indoor heat exchanger 221 and restricting element 222, indoor unit 23 comprises indoor heat exchanger 231 and restricting element 232, and indoor unit 24 comprises indoor heat exchanger 241 and restricting element 242.The first end of the indoor heat exchanger in each indoor unit is connected with corresponding restricting element, second end of the indoor heat exchanger in each indoor unit is connected with the second control valve with the first corresponding control valve, restricting element in each indoor unit is connected with the second check valve with the first corresponding check valve, and the flow direction of the first check valve and the second check valve is contrary.And, four first check valves 305A, 305B, 305C, 305D are all connected to the first public stream, four second check valves 306A, 306B, 306C, 306D are all connected to the second public stream, first heat exchange stream public stream and the second public fluid communication with first respectively of the second heat-exchanging component 307B, first electric expansion valve 304A is connected to the first public stream, second electric expansion valve 304B is connected with the second public stream with the second heat exchange stream of the second heat-exchanging component 307B respectively, and the first electric expansion valve 304A is also parallel with the second magnetic valve 308.
In an embodiment of the present invention, part flow arrangement 30 presses initial control objectives value to control the first electric expansion valve 304A in presetting, and obtain the opening value of the restricting element in the super heat value of the degree of supercooling value that heats indoor unit in multiple indoor unit and refrigeration indoor unit and each indoor unit respectively, if the opening value of the restricting element in any one indoor unit reaches maximum opening, part flow arrangement 30 adjusts current middle pressure-controlled desired value according to the super heat value of the degree of supercooling value and refrigeration indoor unit that heat indoor unit.
Wherein, if described in the opening value of restricting element that heats in indoor unit reach maximum opening and continue the first Preset Time, and described in heat indoor unit degree of supercooling value be greater than target degree of supercooling value, described part flow arrangement increases described current middle pressure-controlled desired value according to default step-length.If the opening value of the restricting element in described refrigeration indoor unit reaches maximum opening and continue the first Preset Time, and the super heat value of described refrigeration indoor unit is greater than target superheat angle value, described part flow arrangement reduces described current middle pressure-controlled desired value according to default step-length.
Particularly, described first Preset Time can be 2-4 minute, and described default step-length can be 0.05-0.15Mpa.
According to one embodiment of present invention, as shown in Figures 1 to 5, also pressure sensor 309A and pressure sensor 309B is set respectively at the first electric expansion valve 304A of parallel connection and the two ends of the second magnetic valve 308, and also distinguishes set temperature sensor 310A and temperature sensor 310B at the two ends of the first heat exchange stream of the second heat-exchanging component 307B.In addition, also pressure sensor 309C is set in one end of the second heat exchange stream of the first heat-exchanging component 307A.
Wherein, the middle pressure in the embodiment of the present invention refers to the pressure difference value between the force value that pressure sensor 309A detects and the force value that pressure sensor 309B detects, and by pressure-controlled desired value in auto modification to control the first electric expansion valve.
In an embodiment of the present invention, middle pressure-controlled is carried out when multiple on-line system is operated in main refrigeration mode.Wherein, it should be noted that, the operational mode of multiple on-line system also comprises pure refrigeration mode and pure heating mode, main heating mode.
The refrigerant just described respectively when multiple on-line system is operated in pure heating mode, main heating mode, pure refrigeration mode and main refrigeration mode with reference to Fig. 2 to Fig. 5 below flows to.
As shown in Figure 2, when off-premises station device 10 judges that multiple on-line system is operated in pure heating mode, now four indoor units carry out heating work.Wherein, refrigerant flows to and is: gases at high pressure from the exhaust outlet of compressor 101 through oil eliminator 105 to cross valve 102, then through check valve 108C, second interface 110, high-pressure stop valve 40 to gas-liquid separator 301, gases at high pressure from the gas vent of gas-liquid separator 301 respectively through four the second control valve 303A, 303B, 303C, 303D, to four corresponding indoor heat exchangers, becomes highly pressurised liquid, and then four road highly pressurised liquids are through corresponding restricting element and four the first check valve 305A, 305B, 305C, the first heat exchange stream of 305D to the second heat-exchanging component 307B, low-pressure gas-liquid two-phase is become through the secondth electric expansion valve 304B, low-pressure gas-liquid two-phase gets back to off-premises station device 10 through the second heat exchange stream of the second heat-exchanging component 307B and the second heat exchange stream of the first heat-exchanging component 307A, and namely low-pressure gas-liquid two-phase is by low-pressure shutoff valve 50, first interface 109, check valve 108D becomes low-pressure gas after getting back to outdoor heat exchanger 103, and low-pressure gas is by cross valve 102, the gas returning port of compressor 101 got back to by outer machine gas-liquid separator 104.
As shown in Figure 3, when off-premises station device 10 judges that multiple on-line system is operated in main heating mode, now have three indoor units to carry out heating work in four indoor units, an indoor unit carries out refrigeration work.Wherein, flow to for the refrigerant that heats and be: gases at high pressure from the exhaust outlet of compressor 101 through oil eliminator 105 to cross valve 102, then through check valve 108C, second interface 110, high-pressure stop valve 40 is to gas-liquid separator 301, gases at high pressure from the gas vent of gas-liquid separator 301 respectively through three the second control valve 303A, 303B, 303C is to three indoor heat exchangers heated in indoor unit of correspondence, become highly pressurised liquid, then three road highly pressurised liquids are through corresponding restricting element and three the first check valve 305A, 305B, the first heat exchange stream of 305C to the second heat-exchanging component 307B, low-pressure gas-liquid two-phase is become through the secondth electric expansion valve 304B, low-pressure gas-liquid two-phase gets back to off-premises station device 10 through the second heat exchange stream of the second heat-exchanging component 307B and the second heat exchange stream of the first heat-exchanging component 307A, namely low-pressure gas-liquid two-phase is by low-pressure shutoff valve 50, first interface 109, check valve 108D becomes low-pressure gas after getting back to outdoor heat exchanger 103, low-pressure gas is by cross valve 102, the gas returning port of compressor 101 got back to by outer machine gas-liquid separator 104.Flow to for the refrigerant that freezes and be: also flowed to the restricting element 242 in indoor unit 24 through the part of the highly pressurised liquid of the first heat exchange stream of the second heat-exchanging component 307B by the second check valve 306D, become low-pressure gas-liquid two-phase, low-pressure gas is become again after the indoor heat exchanger 241 in indoor unit 24, this low-pressure gas with after the low-pressure gas-liquid two-phase mixtures of the second heat exchange stream of the second heat-exchanging component 307B and the second heat exchange stream of the first heat-exchanging component 307A, gets back to off-premises station device 10 after the first control valve 302D.
As shown in Figure 4, when off-premises station device 10 judges that multiple on-line system is operated in pure refrigeration mode, now four indoor units carry out refrigeration work.Wherein, refrigerant flows to and is: gases at high pressure from the exhaust outlet of compressor 101 through oil eliminator 105 to cross valve 102, then after outdoor heat exchanger 103, become highly pressurised liquid, highly pressurised liquid is through check valve 108B, second interface 110, high-pressure stop valve 40 is to gas-liquid separator 301, highly pressurised liquid from the liquid outlet of gas-liquid separator 301 through the first heat exchange stream of the first heat-exchanging component 307A to the first electric expansion valve 304A and the second magnetic valve 308, then divide through the first heat exchange stream of the second heat-exchanging component 307B and be clipped to four the second check valve 306A, 306B, 306C, 306D, through four the second check valve 306A, 306B, 306C, the four road highly pressurised liquids of 306D are corresponding respectively becomes four road low-pressure gas-liquid two-phases after the restricting element in four indoor units, four road low-pressure gas-liquid two-phases are respectively through becoming four road low-pressure gases after the indoor heat exchanger of correspondence, then corresponding to four the first control valve 302A, 302B, 302C, 302D gets back to off-premises station device 10, and namely low-pressure gas is by low-pressure shutoff valve 50, first interface 109, check valve 108A, the gas returning port of compressor 101 got back to by outer machine gas-liquid separator 104.
As shown in Figure 5, when off-premises station device 10 judges that multiple on-line system is operated in main refrigeration mode, now have three indoor units to carry out refrigeration work in four indoor units, an indoor unit carries out heating work.Wherein, flow to for the refrigerant that freezes and be: gases at high pressure from the exhaust outlet of compressor 101 through oil eliminator 105 to cross valve 102, then after outdoor heat exchanger 103, high-pressure gas-liquid two-phase is become, high-pressure gas-liquid two-phase is through check valve 108B, second interface 110, high-pressure stop valve 40 carries out gas-liquid separation to gas-liquid separator 301, wherein, highly pressurised liquid from the liquid outlet of gas-liquid separator 301 through the first heat exchange stream of the first heat-exchanging component 307A to the first electric expansion valve 304A and the second magnetic valve 308, then divide through the first heat exchange stream of the second heat-exchanging component 307B and be clipped to three the second check valve 306A, 306B, 306C, through three the second check valve 306A, 306B, the three road highly pressurised liquids of 306C are corresponding respectively becomes three road low-pressure gas-liquid two-phases after the restricting element in three indoor units, three road low-pressure gas-liquid two-phases are respectively through becoming three road low-pressure gases after the indoor heat exchanger of correspondence, then corresponding to three the first control valve 302A, 302B, 302C gets back to off-premises station device 10, namely low-pressure gas is by low-pressure shutoff valve 50, first interface 109, check valve 108A, the gas returning port of compressor 101 got back to by outer machine gas-liquid separator 104.Flow to for the refrigerant that heats and be: the gases at high pressure carrying out gas-liquid separation through gas-liquid separator 301 from the gas vent of gas-liquid separator 301 through the second control valve 303D to the indoor heat exchanger 241 indoor unit 24, become highly pressurised liquid, highly pressurised liquid is converged by the first check valve 305D and the highly pressurised liquid through the first heat exchange stream of the second heat-exchanging component 307B after the restricting element 242 in indoor unit 24.
In an embodiment of the present invention, in order to realize the pressure reduction automatically controlled before and after the first electric expansion valve 304A, each indoor unit all needs the operational factor sending indoor unit to part flow arrangement 30, wherein, the operational factor of each indoor unit comprises: the operational mode of indoor unit is (as refrigeration mode, heating mode etc.), indoor unit is as the degree of superheat in refrigeration during machine, indoor unit is as the restricting element aperture in refrigeration during machine, indoor unit is as degree of supercooling when heating interior machine, indoor unit is as the restricting element aperture etc. when heating interior machine.
According to one embodiment of present invention, as shown in Figure 6, directly can carry out communication between off-premises station device and part flow arrangement, each indoor unit carries out communication by part flow arrangement and off-premises station device.Wherein, each indoor unit is assigned an address, be convenient to the communication between each indoor unit and the communication between each indoor unit and part flow arrangement, such as the first indoor unit is assigned the first address, second indoor unit is assigned the second address,, the 7th indoor unit is assigned the 7th address.In addition, each indoor unit also comprises line control machine, and each indoor unit also carries out communication with respective line control machine.
Further, according to a concrete example of the present invention, off-premises station control unit in off-premises station device and the control module in part flow arrangement carry out communication, and the control module simultaneously in part flow arrangement and the indoor set control unit in each indoor unit carry out communication.Wherein, the operational mode etc. of each indoor unit that the temperature information (residing for off-premises station device environment temperature, delivery temperature, suction temperature, heat exchange temperature etc.) of the off-premises station control unit Real-time Obtaining off-premises station device in off-premises station device, pressure information (as pressure at expulsion, back pressure etc.) and multiple indoor unit send judges the operational mode (such as pure heating mode, main heating mode, pure refrigeration mode and main refrigeration mode) of multiple on-line system, and the instruction of the operational mode of multiple on-line system is sent to part flow arrangement.Meanwhile, the off-premises station control unit in off-premises station device also controls the parts such as compressor and outdoor fan according to internal logic output instruction signal and runs.
Particularly, after multiple on-line system starts, off-premises station control unit in off-premises station device obtains the operational mode of the ambient temperature information of off-premises station device, pressure information and each indoor unit, judge the operational mode of multiple on-line system, such as, when each indoor unit all runs on refrigeration mode, multiple on-line system operational mode is pure refrigeration mode; When each indoor unit all runs on heating mode, multiple on-line system operational mode is pure heating mode; When in multiple indoor unit, the existing refrigeration mode that runs on is when also running on heating mode, and multiple on-line system operational mode is cooling and warming pattern simultaneously, and off-premises station device sends corresponding modes instruction to part flow arrangement according to the system running pattern judged.Meanwhile, off-premises station device controls the operation of the parts such as compressor and outdoor fan according to internal logic output instruction signal.Part flow arrangement carries out the control of each state parameter according to the mode instruction that off-premises station device is given.
Further, after multiple on-line system startup optimization second Preset Time, part flow arrangement presses initial control objectives value to control the first electric expansion valve in presetting.Wherein, the second Preset Time can be 10-20 minute, preferably, can be 15 minutes.
That is, when multiple on-line system operational mode is main refrigeration mode, multiple on-line system initial operating stage is in this mode as in 15 minutes, press initial control objectives value such as 0.5Mpa in given one of part flow arrangement 30, and press initial control objectives value to carry out PI control to the first electric expansion valve in presetting according to this.Now, the indoor unit the running on refrigeration mode interior machine that namely freezes carries out PI (Proportional Integral according to certain super heat value SH to restricting element such as electric expansion valve corresponding with it, proportional integral) control, namely the indoor unit running on heating mode heats interior machine and carries out PI control according to certain degree of supercooling value SC to restricting element such as electric expansion valve corresponding with it, simultaneously, in refrigeration, the aperture of super heat value SH and restricting element is sent to part flow arrangement 30 by machine at regular intervals, heat interior machine and the aperture of degree of supercooling value SC and restricting element is sent to part flow arrangement 30 at regular intervals.
When the time that multiple on-line system runs on main refrigeration mode is greater than 15 minutes, according to the opening value of the restricting element heated in super heat value and each indoor unit that in degree of supercooling value and refrigeration that interior machine sends, machine sends, part flow arrangement 30 judges whether that centering pressure-controlled desired value Δ P revises.When there being the degree of supercooling value > target degree of supercooling value heating interior machine, and this aperture heating restricting element corresponding to interior machine (i.e. electric expansion valve) reaches maximum opening (such as 480P) and continues 3 minutes, target Δ P=current Δ P+0.1MPa (revising once for every 3 minutes); When there being the super heat value > target superheat angle value of machine in refrigeration, and the aperture of the restricting element that in this refrigeration, machine is corresponding (i.e. electric expansion valve) reaches maximum opening (such as 480P) and continues 3 minutes, target Δ P=current Δ P-0.1MPa (revising once for every 3 minutes).Finally, part flow arrangement carries out PI control according to revised target Δ P to the first electric expansion valve.
Therefore, in an embodiment of the present invention, part flow arrangement can according to pressure-controlled desired value Δ P in machine in refrigeration and the state parameter auto modification heating interior machine, to ensure that the effect of machine in cooling and warming all reaches best.
According to the multiple on-line system of the embodiment of the present invention, first part flow arrangement presses initial control objectives value to control the first electric expansion valve in presetting, then the opening value of the restricting element in the super heat value of the degree of supercooling value that heats indoor unit in multiple indoor unit and refrigeration indoor unit and each indoor unit is obtained respectively, if the opening value of the restricting element in any one indoor unit reaches maximum opening, at this moment part flow arrangement adjusts current middle pressure-controlled desired value according to the super heat value of the degree of supercooling value and refrigeration indoor unit that heat indoor unit, therefore, it is possible to according to pressure-controlled desired value in the operational factor auto modification of the interior machine of operational factor and refrigeration heating interior machine to realize controlling the pressure difference value before and after the first electric expansion valve, all best with machine effect in the cooling and warming ensureing multiple on-line system.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (7)
1. a multiple on-line system, is characterized in that, comprises off-premises station device, part flow arrangement, multiple indoor unit, wherein,
Described part flow arrangement comprises gas-liquid separator, first heat-exchanging component, first electric expansion valve, second heat-exchanging component and the second electric expansion valve, described part flow arrangement presses initial control objectives value to control described first electric expansion valve in presetting, and obtain the opening value of the restricting element in the super heat value of the degree of supercooling value that heats indoor unit in described multiple indoor unit and refrigeration indoor unit and each indoor unit respectively, if the opening value of the restricting element in any one indoor unit reaches maximum opening, described part flow arrangement according to described in heat indoor unit degree of supercooling value and refrigeration indoor unit super heat value current middle pressure-controlled desired value is adjusted.
2. multiple on-line system as claimed in claim 1, it is characterized in that, if described in the opening value of restricting element that heats in indoor unit reach maximum opening and continue the first Preset Time, and described in heat indoor unit degree of supercooling value be greater than target degree of supercooling value, described part flow arrangement increases described current middle pressure-controlled desired value according to default step-length.
3. multiple on-line system as claimed in claim 1, it is characterized in that, if the opening value of the restricting element in described refrigeration indoor unit reaches maximum opening and continue the first Preset Time, and the super heat value of described refrigeration indoor unit is greater than target superheat angle value, described part flow arrangement reduces described current middle pressure-controlled desired value according to default step-length.
4. multiple on-line system as claimed in claim 2 or claim 3, it is characterized in that, described first Preset Time is 2-4 minute, and described default step-length is 0.05-0.15Mpa.
5. multiple on-line system as claimed in claim 1, it is characterized in that, described multiple on-line system is operated in main refrigeration mode.
6. multiple on-line system as claimed in claim 1, is characterized in that, in described multiple on-line system startup optimization second Preset Time, described part flow arrangement with described default in press initial control objectives value to control described first electric expansion valve.
7. multiple on-line system as claimed in claim 6, it is characterized in that, described second Preset Time is 10-20 minute.
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| CN105588281B (en) * | 2015-12-25 | 2018-09-18 | 珠海格力电器股份有限公司 | Heat pattern owes fluorine control method again for a kind of reheat dehumidification multi-line system |
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