CN104748430A - Multiple on-line system - Google Patents
Multiple on-line system Download PDFInfo
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- CN104748430A CN104748430A CN201510151428.0A CN201510151428A CN104748430A CN 104748430 A CN104748430 A CN 104748430A CN 201510151428 A CN201510151428 A CN 201510151428A CN 104748430 A CN104748430 A CN 104748430A
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- pressure
- compressor
- line system
- premises station
- station device
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Classifications
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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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
- F25B49/022—Compressor control arrangements
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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
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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
- F25B2600/02—Compressor control
- F25B2600/027—Compressor control by controlling pressure
Abstract
The invention discloses a multiple on-line system. The multiple on-line system comprises an outdoor unit device, a flow dividing device and multiple indoor unit devices, wherein the outdoor unit device comprises a compressor, an outdoor heat exchanger and a four-way valve. When a pressure value of the flow dividing device reaches a system pressure-withstanding value, the outdoor unit device acquires a current pressure value of the compressor and a pressure difference between the flow dividing device and the compressor according to the pressure value of the flow dividing device and the current pressure value of the compressor and regulates a pressure frequency limiting value of the compressor according to the pressure difference. The multiple on-line system regulates the pressure frequency limiting value of the compressor through the pressure difference between the pressure value of the flow dividing device and the current pressure value of the compressor, therefore, the compressor can be protected and controlled according to a regulated pressure frequency limiting value, and the overall system can be protected effectively.
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, good effect is reached in order to make the function in refrigeration that heats in multiple indoor unit, need to control effectively to the degree of supercooling of part flow arrangement, this just needs pressure sensor can the front and back force value of electric expansion valve in accurate acquisition part flow arrangement.
The control logic of current main flow carries out high pressure limit to the compressor in off-premises station frequently to control, and namely according to giving target value, forbids compressor raising frequency.And if there is high drop between part flow arrangement and off-premises station; this control logic is just intelligent not and comprehensive; thus the pressure sensor of the front and back force value gathering electric expansion valve may be damaged in part flow arrangement, cannot realize carrying out available protecting to multiple on-line system.
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; the pressure limit value frequently of compressor is adjusted by the pressure differential between the force value of part flow arrangement and the current pressure values of compressor; thus make compressor carry out protecting control according to the pressure limit frequency value after adjustment, whole system is effectively protected.
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 off-premises station device comprises compressor, outdoor heat exchanger and cross valve, when the force value of described part flow arrangement reaches system withstand voltage, described off-premises station device obtains the current pressure values of described compressor, and obtain the pressure differential between described part flow arrangement and described compressor according to the force value of described part flow arrangement and the current pressure values of described compressor, and the pressure limit value frequently of described compressor is adjusted according to described pressure differential.
According to the multiple on-line system of the embodiment of the present invention, when the force value of part flow arrangement reaches system withstand voltage, first off-premises station device obtains the current pressure values of compressor, then the pressure differential between part flow arrangement and compressor is obtained according to the force value of part flow arrangement and the current pressure values of compressor, and be frequently worth according to the pressure limit of pressure differential adjustment compressor, last off-premises station device carries out protecting control according to the pressure limit frequency value after adjustment to compressor, thus the difference in height because existing between off-premises station device and part flow arrangement can be avoided and cause in part flow arrangement that to gather pressure that before and after electric expansion valve, the pressure sensor of force value bears excessive and damage, realize the whole multiple on-line system of available protecting, ensure that system stability reliably runs.
According to one embodiment of present invention, the acquiescence pressure of described compressor limit frequency value is deducted described pressure differential with the safe clearance preset to generate the pressure limit frequency value of the described compressor after adjustment by described off-premises station device.
Wherein, described system withstand voltage is 3.5-4.0Mpa, and the acquiescence pressure limit of described compressor is worth frequently for 3.5Mpa, and described default safe clearance is 0.1-0.2Mpa.
According to one embodiment of present invention, when the first time trial run of described multiple on-line system, described off-premises station device adjusts the pressure limit value frequently of described compressor.
In an embodiment of the present invention, described multiple on-line system is operated in pure refrigeration mode.
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.
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, if there is larger difference in height between off-premises station device 10 with part flow arrangement 30; because difference in height exists pressure; when this will cause the force value of part flow arrangement to reach system withstand voltage; and compressor does not reach pressure limit value frequently; if when at this moment compressor continues to control according to original pressure limit frequency value; the pressure of the pressure sensor in part flow arrangement will be caused to exceed safeguard protection value; thus can pressure sensor be damaged; the force value that build-up of pressure sensor detects is inaccurate, affects the safe and stable operation of whole system.
Therefore, in an embodiment of the present invention, when the force value of part flow arrangement 30 reaches system withstand voltage, off-premises station device 10 obtains the current pressure values of compressor 101, and obtain the pressure differential between part flow arrangement 30 and compressor 101 according to the force value of part flow arrangement 30 and the current pressure values of compressor 101, and the pressure limit value frequently of compressor 101 is adjusted in time according to this pressure differential, avoid compressor 101 to continue carry out controlling according to original pressure limit frequency value and damage the pressure sensor in part flow arrangement.
According to one embodiment of present invention, the acquiescence pressure of compressor limit frequency value is deducted pressure differential with the safe clearance preset to generate the pressure limit frequency value of the compressor after adjustment by off-premises station device.
Particularly, system withstand voltage can be 3.5-4.0Mpa, and the acquiescence pressure limit of compressor is worth frequently for 3.5Mpa, and default safe clearance is 0.1-0.2Mpa.
In an embodiment of the present invention, when multiple on-line system is operated in pure refrigeration mode, the pressure limit frequency value of compressor is adjusted.Wherein, it should be noted that, the operational mode of multiple on-line system also comprises pure heating mode, main heating mode and main refrigeration 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 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.
In the running of multiple on-line system, when the force value of part flow arrangement reaches system withstand voltage such as 3.8Mpa, simultaneously the current pressure values such as 3.4Mpa of compressor does not reach acquiescence pressure limit and is frequently worth such as 3.5Mpa, thus fully can judge that off-premises station device is upper, part flow arrangement under, there is certain difference in height between the two, now need the pressure limit value frequently adjusting compressor, the acquiescence pressure of compressor limit frequently can be worth such as 3.5Mpa and deduct pressure differential 0.4Mpa and the safe clearance such as 0.1Mpa that presets and be worth such as 3.0Mpa with the pressure limit frequency of the compressor after generating adjustment by off-premises station device, make off-premises station device carry out limit according to the pressure limit frequency value after adjustment to compressor frequently to control, thus the pressure sensor gathering force value before and after electric expansion valve in part flow arrangement can be avoided to damage.
If after multiple on-line system power-off restarts, multiple on-line system returns to original state, if meet above-mentioned pressure condition, continue to adjust the pressure limit frequency value of compressor.
Wherein, when the first time trial run of multiple on-line system, the pressure limit of off-premises station device adjustment compressor is worth frequently.
According to the multiple on-line system of the embodiment of the present invention, when the force value of part flow arrangement reaches system withstand voltage, first off-premises station device obtains the current pressure values of compressor, then the pressure differential between part flow arrangement and compressor is obtained according to the force value of part flow arrangement and the current pressure values of compressor, and be frequently worth according to the pressure limit of pressure differential adjustment compressor, last off-premises station device carries out protecting control according to the pressure limit frequency value after adjustment to compressor, thus the difference in height because existing between off-premises station device and part flow arrangement can be avoided and cause in part flow arrangement that to gather pressure that before and after electric expansion valve, the pressure sensor of force value bears excessive and damage, realize the whole multiple on-line system of available protecting, ensure that system stability reliably runs.
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 (5)
1. a multiple on-line system, is characterized in that, comprises off-premises station device, part flow arrangement, multiple indoor unit, and wherein, described off-premises station device comprises compressor, outdoor heat exchanger and cross valve,
When the force value of described part flow arrangement reaches system withstand voltage, described off-premises station device obtains the current pressure values of described compressor, and obtain the pressure differential between described part flow arrangement and described compressor according to the force value of described part flow arrangement and the current pressure values of described compressor, and adjust the pressure limit value frequently of described compressor according to described pressure differential.
2. multiple on-line system as claimed in claim 1, is characterized in that, the acquiescence pressure of described compressor limit frequency value is deducted described pressure differential with the safe clearance preset to generate the pressure limit frequency value of the described compressor after adjustment by described off-premises station device.
3. multiple on-line system as claimed in claim 2, it is characterized in that, described system withstand voltage is 3.5-4.0Mpa, and the acquiescence pressure limit of described compressor is worth frequently for 3.5Mpa, and described default safe clearance is 0.1-0.2Mpa.
4. multiple on-line system as claimed in claim 1, is characterized in that, when the first time trial run of described multiple on-line system, described off-premises station device adjusts the pressure limit value frequently of described compressor.
5. the multiple on-line system according to any one of claim 1-4, is characterized in that, described multiple on-line system is operated in pure refrigeration mode.
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| CN201510151428.0A CN104748430B (en) | 2015-03-31 | 2015-03-31 | Multiple on-line system |
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| CN201510151428.0A CN104748430B (en) | 2015-03-31 | 2015-03-31 | Multiple on-line system |
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| CN104748430B CN104748430B (en) | 2018-02-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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