CN104833126A - Variable refrigerant volume system - Google Patents

Variable refrigerant volume system Download PDF

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Publication number
CN104833126A
CN104833126A CN201510151733.XA CN201510151733A CN104833126A CN 104833126 A CN104833126 A CN 104833126A CN 201510151733 A CN201510151733 A CN 201510151733A CN 104833126 A CN104833126 A CN 104833126A
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CN
China
Prior art keywords
line
expansion valve
heat
electric expansion
valve
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Pending
Application number
CN201510151733.XA
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Chinese (zh)
Inventor
罗彬�
陈俊伟
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Application filed by Midea Group Co Ltd, Guangdong Midea HVAC Equipment Co Ltd filed Critical Midea Group Co Ltd
Priority to CN201510151733.XA priority Critical patent/CN104833126A/en
Publication of CN104833126A publication Critical patent/CN104833126A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/006Compression machines, plant, or systems with reversible cycle not otherwise provided for two pipes connecting the outdoor side to the indoor side with multiple indoor units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/023Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/023Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/029Control issues
    • F25B2313/0292Control issues related to reversing valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/031Sensor arrangements
    • F25B2313/0313Pressure sensors near the outdoor heat exchanger
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/031Sensor arrangements
    • F25B2313/0315Temperature sensors near the outdoor heat exchanger

Abstract

The invention discloses a variable refrigerant volume system, which comprises an outdoor unit device, a shunting device and a plurality of indoor unit devices, wherein 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; when the variable refrigerant volume system is in a pure heating mode, the shunting device controls the first electronic expansion valve to be completely switched off, and when the variable refrigerant volume system is controlled to enter a liquid discharge state, the shunting device periodically switches off and switches on the first electronic expansion valve. According to the variable refrigerant volume system, the first electronic expansion valve is controlled, and a high-temperature gaseous state refrigerant is enabled to completely enter heating indoor units, so that the heating effect of the variable refrigerant volume system can be ensured.

Description

Multiple on-line system
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, reaching good heating effect to heat interior function under making pure heating mode, needing to prevent the heat-exchangers of the plate type in part flow arrangement from there is liquid refrigerants.
And in correlation technique, first electric expansion valve is closed completely under pure heating mode, after a period of time, will be there are some and be condensate in gradually in heat-exchangers of the plate type in the high pressure-temperature gaseous coolant in off-premises station, and when overlong time, these liquid refrigerants will feed back to gas-liquid separator, thus can enter and heat interior machine with gaseous coolant, cause indoor set to heat deficiency and leaving air temp appearance fluctuation, impact heats the heating effect of interior machine.
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, by controlling the first electric expansion valve, realizing complete high-temperature gas refrigerant and entering and heat indoor set, ensure the heating effect of 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, wherein, when described multiple on-line system is in pure heating mode, described part flow arrangement controls described first electric expansion valve and closes completely, and when controlling described multiple on-line system and entering discharge opeing state, described first electric expansion valve is periodically closed and opened to described part flow arrangement.
According to the multiple on-line system of the embodiment of the present invention, when entering pure heating mode, first control the first electric expansion valve to close completely, then when controlling multiple on-line system and entering discharge opeing state, part flow arrangement is periodically closed and is opened the first electric expansion valve, thus the liquid refrigerants existed in the first heat-exchanging component in part flow arrangement can be discharged in time, effectively prevent from liquid refrigerants to be deposited in the first heat-exchanging component entering with gaseous coolant after feeding back to gas-liquid separator heating indoor unit, complete high-temperature gas refrigerant can be realized enter and heat interior machine, ensure the heating effect of multiple on-line system.
According to one embodiment of present invention, described part flow arrangement closes described first electric expansion valve in the first time period of one-period, opens described first electric expansion valve in second time period in described cycle.
Wherein, the ratio between described first time period and described second time period is 6:1-10:1.
Particularly, described one-period can be 20 minutes, and described first time period is 18 minutes, and described second time period is 2 minutes.
According to one embodiment of present invention, when described multiple on-line system enters oil return or defrosting mode, described multiple on-line system exits described discharge opeing state.
According to one embodiment of present invention, when described multiple on-line system exits described pure heating mode, described multiple on-line system exits described discharge opeing state.
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, when multiple on-line system is in pure heating mode, part flow arrangement 30 controls the first electric expansion valve 304A and closes completely, and when controlling multiple on-line system and entering discharge opeing state, the first electric expansion valve 304A is periodically closed and opened to part flow arrangement 30.
Wherein, part flow arrangement 30 closes the first electric expansion valve 304A in the first time period of one-period, opens the first electric expansion valve 304A in the second time period of one-period.
Further, the ratio between first time period and the second time period is 6:1-10:1.
Particularly, one-period can be 20 minutes, and first time period is 18 minutes, and the second time period was 2 minutes.
That is, when multiple on-line system is in discharge opeing state, part flow arrangement 30 controls the first electric expansion valve and closes 18 minutes, open 2 minutes again, so every 20 minutes circulation primary, realize discharging the depositing liquid refrigerant in the first heat-exchanging component, effectively prevent liquid refrigerants from entering and heat interior machine.
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.
In an embodiment of the present invention, discharge opeing control is carried out when multiple on-line system is operated in pure heating mode.Wherein, it should be noted that, the operational mode of multiple on-line system also comprises pure refrigeration mode, main refrigeration mode and 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 sum, in an embodiment of the present invention, after multiple on-line system starts, first off-premises station device judges whether multiple on-line system operates in pure heating mode, if judge that multiple on-line system operates in pure heating mode, then judge whether the first electric expansion valve is in buttoned-up status further, and after the first electric expansion valve is closed completely, first electric expansion valve just enters discharge opeing and controls time-count cycle, namely say, part flow arrangement, before control first electric expansion valve periodically opens and closes, also judges whether the first electric expansion valve closes completely.
That is, after off-premises station device and part flow arrangement all determine that multiple on-line system operates in pure heating mode, and when part flow arrangement judges that the first electric expansion valve is closed completely, just discharge opeing timing can be entered.After entering discharge opeing timing, part flow arrangement controls the switch periods of the first electric expansion valve, such as one-period 20 minutes, close 18 minutes, open 2 minutes, so circulate, thus the depositing liquid refrigerant in the first heat-exchanging component can be discharged, realize discharge opeing to control, avoid liquid refrigerants to enter and heat interior machine, ensure that the heating effect heating interior machine is best.
According to one embodiment of present invention, when multiple on-line system enters oil return or defrosting mode, discharge opeing timing terminates, and multiple on-line system exits discharge opeing state.
Or when multiple on-line system exits pure heating mode, discharge opeing timing terminates, and multiple on-line system exits discharge opeing state.
That is, when multiple on-line system exits current residing pure heating mode or is switched to non-pure heating mode, discharge opeing terminates time-count cycle, no longer carries out discharge opeing control.
In addition, in an embodiment of the present invention, in order to realize the pressure differential deltap P 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.
According to the multiple on-line system of the embodiment of the present invention, when entering pure heating mode, first control the first electric expansion valve to close completely, then when controlling multiple on-line system and entering discharge opeing state, part flow arrangement is periodically closed and is opened the first electric expansion valve, thus the liquid refrigerants existed in the first heat-exchanging component in part flow arrangement can be discharged in time, effectively prevent from liquid refrigerants to be deposited in the first heat-exchanging component entering with gaseous coolant after feeding back to gas-liquid separator heating indoor unit, complete high-temperature gas refrigerant can be realized enter and heat interior machine, ensure the heating effect of 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 (6)

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, the first heat-exchanging component, the first electric expansion valve, the second heat-exchanging component and the second electric expansion valve, wherein, when described multiple on-line system is in pure heating mode, described part flow arrangement controls described first electric expansion valve and closes completely, and when controlling described multiple on-line system and entering discharge opeing state, described first electric expansion valve is periodically closed and opened to described part flow arrangement.
2. multiple on-line system as claimed in claim 1, is characterized in that, described part flow arrangement closes described first electric expansion valve in the first time period of one-period, opens described first electric expansion valve in second time period in described cycle.
3. multiple on-line system as claimed in claim 2, it is characterized in that, the ratio between described first time period and described second time period is 6:1-10:1.
4. multiple on-line system as claimed in claim 2, it is characterized in that, described one-period is 20 minutes, and described first time period is 18 minutes, and described second time period is 2 minutes.
5. multiple on-line system as claimed in claim 1, it is characterized in that, when described multiple on-line system enters oil return or defrosting mode, described multiple on-line system exits described discharge opeing state.
6. multiple on-line system as claimed in claim 1, it is characterized in that, when described multiple on-line system exits described pure heating mode, described multiple on-line system exits described discharge opeing state.
CN201510151733.XA 2015-03-31 2015-03-31 Variable refrigerant volume system Pending CN104833126A (en)

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CN106766326A (en) * 2016-11-24 2017-05-31 广东美的暖通设备有限公司 Multiple on-line system and its refrigeration in press restricting element control method
CN107975989A (en) * 2017-11-16 2018-05-01 广东美的暖通设备有限公司 The defrosting control method of multi-online air-conditioning system
CN110296554A (en) * 2019-07-02 2019-10-01 珠海格力电器股份有限公司 Shunt assembly and its flow-dividing control method and multi-connected air conditioner device
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CN106322652A (en) * 2016-08-19 2017-01-11 广东美的暖通设备有限公司 Multi-split air conditioner system and failure detection method for main flow path valve component of multi-split air conditioner system
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CN110296554A (en) * 2019-07-02 2019-10-01 珠海格力电器股份有限公司 Shunt assembly and its flow-dividing control method and multi-connected air conditioner device
CN111503813A (en) * 2020-04-29 2020-08-07 广东美的暖通设备有限公司 Multi-split system and control method and device thereof
CN111503851A (en) * 2020-04-29 2020-08-07 广东美的暖通设备有限公司 Control method and device of multi-split air conditioning system

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