CN101329093A - Multi air-conditioner for simultaneously cooling/heating and method for controlling the same - Google Patents
Multi air-conditioner for simultaneously cooling/heating and method for controlling the same Download PDFInfo
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- CN101329093A CN101329093A CNA200810082234XA CN200810082234A CN101329093A CN 101329093 A CN101329093 A CN 101329093A CN A200810082234X A CNA200810082234X A CN A200810082234XA CN 200810082234 A CN200810082234 A CN 200810082234A CN 101329093 A CN101329093 A CN 101329093A
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- 238000001816 cooling Methods 0.000 title claims abstract description 87
- 238000010438 heat treatment Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 238000010792 warming Methods 0.000 claims description 78
- 239000007789 gas Substances 0.000 claims description 77
- 238000005057 refrigeration Methods 0.000 claims description 37
- 238000005457 optimization Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 description 31
- 230000000977 initiatory effect Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000003190 augmentative effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000001447 compensatory effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Classifications
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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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor 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
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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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
- F25B2313/005—Outdoor unit expansion 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/007—Compression machines, plants or systems with reversible cycle not otherwise provided for three pipes connecting the outdoor side to the indoor side with 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
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2313/029—Control issues
- F25B2313/0294—Control issues related to the outdoor fan, e.g. controlling speed
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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
- F25B2600/2501—Bypass 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
A multi air-conditioner for simultaneously cooling/heating room air and a method for controlling the same are disclosed. The multi air-conditioner for simultaneously cooling/heating room air includes: a high-pressure gas pipe, a low-pressure gas pipe, and a liquid line, which are connected between at least one outdoor unit and a plurality of cooling/heating switching sets; a flow-regulating valve mounted to a bypass pipe connected between the high-pressure gas pipe and the liquid pipe; and a controller for increasing an opening degree of the flow-regulating valve, if a heating rate is not below a reference rate during a heating-biased operation and is equal to or less than a required cooling capacity of an indoor cooling unit during the heating-biased operation.
Description
Technical field
The present invention relates to a kind of multi-connected air conditioner and control method thereof of carrying out cooling and warming simultaneously, relate in particular to a kind of heating and prevent when being main the operation that compressor from excessively moving, preventing multi-connected air conditioner and the control method thereof that the cold-producing medium stagnation behavior takes place, prevent to carry out cooling and warming when indoor heat converter freezes in outdoor heat converter.
Background technology
Usually, air conditioner is the device that utilizes kind of refrigeration cycle that the interior space is freezed or heated.Recently, released on the market and a kind ofly freezed more efficiently or heat the indoor multi-connected air conditioner that is divided into a plurality of separate space, this multi-connected air conditioner is made up of an off-premises station and a plurality of indoor sets of being separately positioned on a plurality of separate space.
But this multi-connected air conditioner need freeze in the part separate space, another part separate space is also carried out refrigerating operaton or heating operation when need heat without exception, can not suitably tackle the limitation that each separate space needs so exist.
In order to overcome this limitation, release a kind of indoor set that is located in the part separate space recently and can carry out heating operation, be located at the multi-connected air conditioner that can carry out cooling and warming simultaneously that indoor set in another part separate space can be carried out refrigerating operaton.
To carry out bigger the heating of heating capacity ratio be main operation if carry out the multi-connected air conditioner of cooling and warming simultaneously, and the gases at high pressure state cold-producing medium of then compressed machine compression flows into the cooling and warming converting unit through high-pressure gas pipe.The gases at high pressure state cold-producing medium that flows into the cooling and warming converting unit flows into opens the heat exchanger that heats indoor set that heats valve.Inflow heats the high-pressure gas refrigerant of heat exchanger of indoor set and room air liquefy and discharging when carrying out heat exchange.The part of the liquid refrigerant of discharging from heat indoor set flows to off-premises station along the liquid pipe, and the remaining flow direction is carried out the refrigeration indoor set of refrigerating operaton.
But, so carry out heating when being main operation, liquid refrigerant flows into off-premises station too much, causes flowing into the quantity not sufficient of the liquid refrigerant of refrigeration indoor set, so the problem that exists the refrigerating capacity of refrigeration indoor set to reduce.
For addressing the above problem, proposed as the special 2005-0005089 number disclosed multi-connected air conditioner that carries out cooling and warming when comprising the isocon that is used to connect high-pressure gas pipe and liquid pipe of Korea S publication communique.
If the disclosed existing multi-connected air conditioner that can carry out cooling and warming simultaneously of described communique is carried out and heated is main operation, the part of high-pressure gas refrigerant of high-pressure gas pipe of then flowing through flow into the liquid pipe through isocon and suppresses to flow to the cold-producing medium of outdoor heat converter, thereby increases the refrigerating capacity that the refrigerant amount that flows to the refrigeration indoor set improves the refrigeration indoor set.
But the existing multi-connected air conditioner that can carry out cooling and warming simultaneously is because the part of the cold-producing medium of the high-pressure gas pipe of flowing through flows to the liquid pipe, thereby the high-pressure gas pipe pressure inside can diminish.For compensatory pressure, increase the compressor compresses consumption, therefore there are problems such as consumed power increase, efficient reduction in the existing multi-connected air conditioner that carries out cooling and warming simultaneously.
Also have, the existing multi-connected air conditioner that carries out cooling and warming simultaneously will use as evaporimeter by outdoor heat converter, so the outdoor heat converter pressure inside diminishes in the lower situation of the outdoor temperature that off-premises station is set.Meanwhile, the internal pressure of the internal pressure of the low-pressure gas pipe that is connected with outdoor heat converter and the indoor heat converter that is connected with low-pressure gas pipe diminishes.Thus, the refrigerant temperature of indoor heat converter reduces, thus the frozen phenomenon of freezing of dew of condensing on the generation indoor heat converter.
Summary of the invention
The present invention proposes in order to address the above problem, its purpose is to provide a kind of heating when being main the operation to prevent that high-pressure gas refrigerant exceedingly is diverted to the liquid pipe, thereby carries out the multi-connected air conditioner and the control method thereof of cooling and warming when reducing consumed power in the excessive operation that prevents compressor.
And the present invention also aims to provide a kind of multi-connected air conditioner and control method thereof of carrying out cooling and warming simultaneously, to be used for when the outdoor temperature that off-premises station is set is low, outdoor heat converter is not used as evaporimeter, and the saturation pressure that prevents outdoor heat converter is lower than the low-pressure gas pipe pressure inside, thereby the phenomenon that prevents from outdoor heat converter to take place cold-producing medium to be liquefied and stagnate, thereby and excessively reduce by the internal pressure that prevents outdoor heat converter and to prevent from indoor heat converter, to freeze.
For reaching described purpose, comprise according to the multi-connected air conditioner that carries out cooling and warming simultaneously provided by the present invention: be connected high-pressure gas pipe, low-pressure gas pipe and liquid pipe between at least one off-premises station and a plurality of cooling and warming conversion group; Control part, when serving as main operation to be used to heat, if heat ratio not for below the base ratio, and the refrigeration required amount of refrigeration indoor set then reduces the aperture of described flow control valve below the benchmark required amount.
At this, also comprise outdoor expansion valve and outdoor Air Blast fan, and described control part utilizes described outdoor expansion valve to carry out degree of superheat control, utilizes described outdoor Air Blast fan to carry out low voltage control, and the aperture of regulating described flow control valve according to the average aperture of described refrigeration indoor set.
In order to reach described purpose from the another side, comprise according to the multi-connected air conditioner that carries out cooling and warming simultaneously provided by the present invention: the outdoor temperature sensor that is used to detect outdoor temperature; Be used to detect the low pressure sensor of low-pressure gas pipe internal pressure; Control part, the outdoor temperature that this control part utilizes described outdoor temperature sensor to detect is calculated the saturation pressure of outdoor heat converter, and the calculation of pressure cold-producing medium stagnation pressure that utilizes described low pressure sensor to detect, and then more described saturation pressure and described cold-producing medium stagnation pressure are stagnated and are prevented operation to carry out the cooling and warming ability and improve operation or to carry out cold-producing medium.
At this, the described multi-connected air conditioner that carries out cooling and warming simultaneously also comprises the flow control valve that is used to regulate flow that is located on the isocon that connects high-pressure gas pipe and liquid pipe, is used to block stop valve and outdoor Air Blast fan to the cold-producing medium of outdoor heat converter side shifting, and described control part is when carrying out cooling and warming ability raising operation, close described flow control valve and described stop valve, and stop described outdoor Air Blast fan.
Have again, also comprise the flow control valve that is used to regulate flow that is located on the isocon that connects high-pressure gas pipe and liquid pipe, be used to block stop valve to the cold-producing medium of outdoor heat converter side shifting, and outdoor Air Blast fan, and when described control part prevents to move in the stagnation of execution cold-producing medium, open described flow control valve and described stop valve, stop described outdoor Air Blast fan, and detect low pressure once more,, detected low pressure increases the aperture of described outdoor electric expansion valve if being not more than refrigerating capacity optimization pressure, if described detected low pressure is greater than described refrigerating capacity optimization pressure then reduce the aperture of described outdoor electric expansion valve.
In order to reach described purpose from the another side, according to control method of carrying out the multi-connected air conditioner of cooling and warming simultaneously provided by the present invention be: heat and judge when being main operation that the heating capacity ratio is whether more than base ratio, if described heating capacity ratio not below base ratio, is then regulated the flow that flows the gases at high pressure of liquid-in pipe from high-pressure gas pipe.
At this, described Flow-rate adjustment carries out carrying out degree of superheat control and utilizing the air quantity of outdoor Air Blast fan to regulate and carry out low voltage control and stop valve is opened control for the aperture of the outer electronic expansion valve of: conditioning chamber.
And described Flow-rate adjustment is: calculate the average aperture of the indoor electric expansion valve of refrigeration indoor set, if the average aperture of calculating is not more than the benchmark aperture then reduces flow, if the average aperture of described calculating is greater than the benchmark aperture then increase flow.
In order to reach described purpose from the another side, according to control method of carrying out the multi-connected air conditioner of cooling and warming simultaneously provided by the present invention be: heating is that main run duration judges that the heating capacity ratio is whether more than base ratio, when described heating capacity ratio during less than base ratio, if the saturation pressure of outdoor heat converter less than the cold-producing medium stagnation pressure of low-pressure gas pipe then carry out cold-producing medium and stagnate and prevent operation, is carried out the cooling and warming ability and is guaranteed operation if the saturation pressure of described outdoor heat converter is not less than the cold-producing medium stagnation pressure of described low-pressure gas pipe.
At this, described cooling and warming ability is guaranteed to operate to: close flow control valve and stop valve and stop outdoor Air Blast fan, and calculate the average outlet temperature that heats indoor set, if the described average outlet temperature that heats indoor set less than the optimization temperature then increase the aperture of flow control valve, reduces the aperture of described flow control valve if the described average outlet temperature that heats indoor set is not less than the optimization temperature.
Having described cold-producing medium to stagnate again prevents to operate to: open flows adjustable valve, stop valve, and stop outdoor Air Blast fan, if and the low pressure of described low-pressure gas pipe increases the aperture of described outdoor electric expansion valve greater than the refrigerating capacity optimum pressure then reduce the aperture of outdoor electric expansion valve if the low pressure of described low-pressure gas pipe is not more than the refrigerating capacity optimum pressure.
Description of drawings
The flow circuit diagram of the multi-connected air conditioner of cooling and warming is provided when providing according to the embodiment of the invention for expression Fig. 1;
The block diagram of control system of the multi-connected air conditioner of cooling and warming is provided when providing according to the embodiment of the invention for expression Fig. 2;
The flow chart of control sequence of the multi-connected air conditioner of cooling and warming is provided when providing according to the embodiment of the invention for expression Fig. 3 A to Fig. 3 C;
The schematic diagram that heats flow state when being main operation of the multi-connected air conditioner of cooling and warming is provided when providing according to embodiments of the invention for expression Fig. 4.
Main symbol description:
200: off-premises station 210: compressor
220: outdoor heat converter 230: cross valve
250: isocon 260: flow control valve
270: stop valve 280: outdoor electric expansion valve
290: outdoor Air Blast fan 300: indoor set
301: heat indoor set outlet side temperature sensor 302: indoor heat converter
304: indoor electric expansion valve 400: cooling and warming converting unit
440: cooling and warming conversion group 520: outdoor temperature sensor
530: low pressure sensor
The specific embodiment
Below, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The multi-connected air conditioner 100 that cooling and warming is provided when providing according to the embodiment of the invention as shown in Figures 1 and 2, comprises: be arranged on outdoor off-premises station 200; Be arranged on indoor a plurality of indoor sets 300; Make a plurality of indoor sets 300 carry out the cooling and warming converting unit 400 of refrigerating operaton or heating operation and the control part 500 that the multi-connected air conditioner 100 of cooling and warming is carried out in overall control simultaneously.
Off-premises station 200 comprises: the compressor 210 of compressed refrigerant; Make cold-producing medium and outdoor air carry out the outdoor heat converter 220 of heat exchange; The cross valve 230 that freezes or heat circulation is set according to the operational mode of the multi-connected air conditioner 100 that carries out cooling and warming simultaneously; The reservoir 201 that provides in the suction side of compressor 210; The low-pressure gas pipe 430 of the stream that makes low-pressure refrigerant gas flow into reservoir 201 is provided; Be connected in the outdoor electric expansion valve 280 of outdoor heat converter 220 1 sides; First tube connector 213 of junction chamber outer heat-exchanger 220 opposite sides and cross valve 230; Second tube connector 214 that connects cross valve 230 and reservoir 201; The 3rd tube connector 215 of junction chamber outer heat-exchanger 220 and outdoor electric expansion valve 280; Be located at the receiving vessel (Receiver tank) 202 between outdoor electric expansion valve 280 and the liquid pipe 420; Be connected in the high-pressure gas pipe 410 that cross valve 230 makes the high-pressure gas refrigerant of process cross valve 230 move to cooling and warming converting unit 400; The high pressure branched pipe 204 that connects first tube connector 213 and high-pressure gas pipe 410; Make the isocon 250 that a part of gases at high pressure are shunted to liquid pipe 420 in the high-pressure gas pipe 410.
This compressor 210 is compressed into high pressure conditions according to the operational mode of the multi-connected air conditioner 100 that carries out cooling and warming simultaneously behind low-pressure gas pipe 430 and/or outdoor heat converter 220 suction low-pressure refrigerant gas, provide high-pressure gas refrigerant to high-pressure gas pipe 410 and/or outdoor heat converter 220 afterwards.Constant speed compressor 211 is according to certain compression volume operation, and the variable compressive capacity that compressor with variable 212 is controlled according to control part 500 moves.
For to the cold-producing medium of compressor 210 inflow gas states and guarantee the reliability of compressor 210, reservoir 201 is set in the suction side of compressor 210.
In other words, reservoir 201 is used for storage temporarily and passes through low-pressure gas pipe 430 to the liquid refrigerant of the cold-producing medium of compressor 210 side shiftings with by the liquid refrigerant in the cold-producing medium of second tube connector, 214 inflows, makes it become gaseous refrigerant and flows into compressor 210 afterwards.Therefore, the cold-producing medium of an inflow gas state in the compressor 210, thereby reliability service.
The suction oral-lateral of compressor 210 is provided with the low pressure sensor 530 that detects low-pressure gas pipe 430 internal pressures.This low pressure sensor 530 can detect low-pressure gas pipe 430 pressure inside, provides low pressure as the internal pressure value of low-pressure gas pipe 430 to control part 500.
In order to force to blow outdoor air, be provided with outdoor Air Blast fan 290 in the adjacent position of outdoor heat converter 220 to outdoor heat converter 220.This outdoor Air Blast fan 290 is according to control part 500 control air output or ON/OFF.
With the valve 207 that outdoor electric expansion valve 280 is connected side by side the cold-producing medium that flows out from outdoor heat converter 220 is optionally flowed.
The part that outdoor electric expansion valve 280 is connected with liquid pipe 420 is provided with receiving vessel 202, makes the refrigerant amount that flow in the outdoor heat converter 220 keep certain, with the reliability of the multi-connected air conditioner 100 of guaranteeing to carry out simultaneously cooling and warming.
In receiving vessel 202 and the part that liquid pipe 420 is connected, stop valve 270 is set in the part adjacent with receiving vessel 202.
With stop valve 270 is benchmark, connects isocon 250 on the liquid pipe 420 of receiving vessel 202 opposition sides.And, the flow control valve 260 of the flow of regulating the cold-producing medium flow through isocon 250 is set on isocon 250.When the multi-connected air conditioner 100 that carries out cooling and warming simultaneously heats when being main operation, if open flows adjustable valve 260, the refrigerant flow direction that the indoor set 300 that carries out heating operation is discharged is carried out the indoor set 300 of refrigerating operaton, thereby can improve the refrigerating capacity of the indoor set 300 of carrying out cooling operation.
The inside of off-premises station 200 simultaneously is provided for detecting the outdoor temperature sensor 520 of outdoor temperature.Outdoor temperature sensor 520 detects outdoor temperature, and the outdoor temperature value is offered control part 500.
Cooling and warming converting unit 400 comprises: by heating a plurality of cooling and warming conversion group 440 that valve 441 and refrigeration valve 442 constitute; The first gases at high pressure branched pipe 412 from high-pressure gas pipe 410 branches; From the first low-pressure gas branched pipe 432 of low-pressure gas pipe 430 branches and from the first liquid branch pipe 422 of liquid pipe 420 branches.
Also comprise: from the second gases at high pressure branched pipe 413 of the first gases at high pressure branched pipe, 412 branches with from the second liquid branch pipe 423 of the first liquid branch pipe, 422 branches and from the second low-pressure gas branched pipe 433 of the first low-pressure gas branched pipe, 432 branches.
The valve 441 that heats of cooling and warming conversion group 440 is connected with the second gases at high pressure branched pipe 413, and the refrigeration valve 442 of cooling and warming conversion group 440 is connected with the second low-pressure gas branched pipe 433.And, heat valve 441 and be connected with indoor tube connector 305, and indoor tube connector 305 is connected a side of indoor heat converter 302 with refrigeration valve 442.And the second liquid branch pipe 423 is connected with the indoor electric expansion valve 304 of indoor set 300 described later.
This cooling and warming converting unit 400 makes each indoor set 300 carry out effect of heating or refrigeration.That is to say, do the time spent when certain indoor set 300 execution heats, heat valve 441 and open, refrigeration valve 442 is closed, thereby making the cold-producing medium inflow indoor heat exchanger 302 of the second gases at high pressure branched pipe 413 of flowing through, flows along the second liquid branch pipe 423 in the back that is condensed.And, when certain indoor set 300 is carried out refrigerations, heating valve 441 and close, refrigeration valve 442 is open, flows along the second low-pressure gas branched pipe 433 thereby make the liquid refrigerant streams of the second liquid branch pipe 423 of flowing through go into indoor heat exchanger 302 evaporation backs.
Indoor set 300 comprises: make room air and cold-producing medium carry out heat exchange indoor heat converter 302, be located at the part that indoor heat converter 302 is connected with the second liquid branch pipe 423 indoor electric expansion valve 304, be located at the part that indoor heat converter 302 is connected with indoor electric expansion valve 304 and detect refrigerant temperature heat indoor set outlet side temperature sensor 301.
At this, heat the indoor set that indoor set is defined as carrying out in the indoor set 300 heating operation.
This indoor set 300 is made up of a plurality of, and each indoor set 300 is arranged in each room or the separate space, thereby heats or freeze each room or separate space.
500 pairs of control parts carry out the multi-connected air conditioner 100 of cooling and warming simultaneously and control comprehensively.The input side of control part 500 provides outdoor temperature sensor 520, low pressure sensor 530, heat the input part 510 that indoor set outlet side temperature sensor 301 and user can input of control commands.And the outlet side of control part 500 comprises driven compressor portion 540, the cross valve drive division 550 that is used to drive cross valve 230, the flow control valve drive division 560 that is used to drive flow control valve 260, the stop valve drive division 570 that is used to drive stop valve 270 that are used for drive compression machine 210, is used to drive the cooling and warming drive division 580 of cooling and warming conversion group 440, the indoor electric expansion valve drive division 595 that is used for the outdoor electric expansion valve drive division 590 of electronic expansion valve 280 outside the drive chamber and is used for electric expansion valve 304 in the drive chamber.
Below, when providing according to embodiments of the invention, accompanying drawings carries out the control method and the effect of the multi-connected air conditioner of cooling and warming.
With reference to Fig. 3 A to Fig. 3 C and Fig. 4, at first, connect power supply (801) if carry out the multi-connected air conditioner 100 of cooling and warming simultaneously, then control part 500 will judge whether operation initiation command input (802).
At this moment, if input operation initiation command, then control part 500 continues to have judged whether the input of operation initiation command, and if the input of operation initiation command is arranged, just calculate heating capacity ratio (803).At this, the heating capacity ratio refers to the percentage of the indoor set capacity that heats with respect to the working capacity of whole indoor sets of carrying out heating operation.
Then, control part 500 judges that whether the heating capacity ratio is is the heating capacity ratio (804) of main operation corresponding to heating.At this, be that the main heating capacity ratio that moves is approximately more than 50%, below 99% corresponding to heating.
At this moment, be the heating capacity ratio of main operation if the heating capacity ratio does not meet corresponding to heating, then control part 500 will be controlled the multi-connected air conditioner 100 that carries out cooling and warming simultaneously and make the operation (805) of its execution corresponding to remaining heating capacity ratio.That is to say, if the heating capacity ratio is 100%, then control part 500 will be controlled the multi-connected air conditioner 100 that carries out cooling and warming simultaneously and make its execution heating operation, if the heating capacity ratio is approximately more than 1%, below 49%, then will control the multi-connected air conditioner 100 execution refrigeration of carrying out cooling and warming simultaneously is main operation, if the heating capacity ratio is 0%, then will controls the multi-connected air conditioner 100 that carries out cooling and warming simultaneously and make it carry out refrigerating operaton.
Then, control part 500 judges whether to meet the termination condition (806) corresponding to the operation of remaining heating capacity ratio.At this moment, if do not meet termination condition corresponding to the operation of remaining heating capacity ratio, then the multi-connected air conditioner 100 of control part 500 controls carrying out simultaneously cooling and warming continues to carry out the operation corresponding to remaining heating capacity ratio, if and be judged as the termination condition that meets corresponding to the operation of remaining heating capacity ratio, then judge whether to be end of run condition (807).
At this moment, control part 500 judges whether to be the end of run condition, if not the end of run condition, then turn back to the step (803) of calculating the heating capacity ratio again, if end of run condition, then disconnect connecting and carry out the power supply of the multi-connected air conditioner 100 of cooling and warming in simultaneously, and finish operation (808).
In addition, in (804) step, if the heating capacity ratio is for being the heating capacity ratio of main operation corresponding to heating, when then control part 500 was closed flow control valve 260 as shown in Figure 4, it was main operation (809) that the multi-connected air conditioner 100 that cooling and warming is carried out in control simultaneously heats its execution.That is to say, make corresponding to the valve 441 that heats of the cooling and warming conversion group 440 that heats indoor set 300 of carrying out heating operation and open, and refrigeration valve 442 is closed.Also have, make corresponding to the valve 441 that heats of the cooling and warming conversion group 440 of the refrigeration indoor set 300 of carrying out refrigerating operaton and close, and make refrigeration valve 442 open.Have again, the first interface 230A of the cross valve 230 of off-premises station 200 is connected with the 4th interface 230D, and the second interface 230B of cross valve 230 is connected with the 3rd interface 230C.Therefore, compressed high-pressure refrigerant heats the indoor heat converter 302 of valve 441 by heating indoor set 300 through high-pressure gas pipe 410 and cooling and warming conversion group 440 in compressor 210.At this moment, high-pressure refrigerant and room air carry out heat exchange and condensation.And, the condensed refrigerant indoor heat converter 302 of refrigeration indoor set 300 successively when heating the indoor heat converter 302 of indoor set 300 through the second liquid branch pipe 423 and the first liquid branch pipe 422 and the second liquid branch pipe 423 and by carrying out cooling operation.At this moment, cold-producing medium of indoor heat converter 302 by refrigeration indoor set 300 and room air carry out heat exchange and evaporate.And the flow through refrigeration valve 442 and the second and first low pressure branched pipe, 433,432 backs of cooling and warming conversion group 440 of the cold-producing medium of evaporation flow into compressor 210 again by low-pressure gas pipe 430 in the time of through indoor heat converter 302.
In this process, control part 500 judges whether the heating capacity ratio is base ratio following (810).
At this moment, if the heating capacity ratio is not below the base ratio, then control part 500 is opened stop valves 270.And, carry out the control of the target degree of superheat by the aperture of the outer electronic expansion valve 280 of conditioning chamber, and by outdoor Air Blast fan 290 low voltage control (811).
Then, the aperture of the indoor electric expansion valve 304 of the refrigeration indoor set 300 of control part 500 mensuration execution cooling operations is calculated average aperture (812).
Next, control part 500 judges that whether the average aperture of calculating is greater than benchmark aperture (813).At this moment, if the average aperture of calculating is not more than the benchmark aperture, the aperture that then reduces flow control valve 260 reduces the flow (814) of the high-pressure gas refrigerant of shunting by flow control valve 260, if the average aperture of calculating is greater than the benchmark aperture, then the aperture of augmented flow control valve 260 increases the flow (815) by the high-pressure gas refrigerant of flow control valve 260 shuntings.Thus, the refrigerant amount that flow into refrigeration indoor set 300 flows into refrigeration indoor set 300 desired refrigerant amounts, thereby improves the refrigerating capacity of refrigeration indoor set 300.
Next, control part 500 judges whether that satisfied heating is main end of run condition (816).At this moment, be main end of run condition if not heating, carry out then that to heat be main operation; If heat is main end of run condition, then carries out step (807) and the step afterwards thereof that judges whether to the end of run condition.
In addition, judging that the heating capacity ratio is whether in the step (810) below base ratio, if the heating capacity ratio is below the base ratio, then control part 500 makes the saturated saturation pressure of cold-producing medium by calculating from the outdoor temperature value of outdoor temperature sensor 520 inputs outdoor heat converter 220, and receives low-pressure gas pipe 430 pressure inside values (817) from low pressure sensor 530.
Next, control part 500 judges that whether saturation pressure is less than cold-producing medium stagnation pressure (818).At this, the cold-producing medium stagnation pressure adds the reliability value pressure of (being used to guarantee the numerical value of reliability) for the low pressure that is detected at low pressure sensor 530.
At this moment, if saturation pressure is not less than the cold-producing medium stagnation pressure, then control part 500 control stop valves 270 are closed it, and the fan 290 of blowing outside the control room makes it stop to drive (819).Next, control part 500 heats indoor set outlet side temperature value (820) from indoor set outlet side temperature sensor 301 receptions that heat that are located at the outlet side that heats indoor set 300 of carrying out heating operation, and calculates the outlet side mean temperature (821) that heats indoor set 300.
Then, whether control part 500 judgements heat the outlet side mean temperature of indoor set 300 less than optimization temperature (822).
At this moment, be not less than heating capacity optimization temperature if heat the outlet side mean temperature of indoor set 300, then the aperture of control part 500 control flow control valves 260 reduces it, thereby guarantees to carry out the heating capacity that heats indoor set 300 (823) of heating operation.If the outlet side mean temperature that heats indoor set 300 is less than heating capacity optimization temperature, then the aperture of control part 500 control flow control valves 260 increases it, thereby guarantees to carry out the refrigerating capacity (824) of the refrigeration indoor set 300 of refrigerating operaton.Then, control part 500 judges whether the heating capacity ratio changes (830).At this moment, heating capacity ratio no change is then carried out and heated is main operation, and the heating capacity ratio changes then to carry out and judges whether that for heating be the step (816) and the step afterwards thereof of main end of run condition.
In addition, judging that saturation pressure is whether in the step (818) less than the cold-producing medium stagnation pressure, if saturation pressure is less than the cold-producing medium stagnation pressure, then control part 500 open flows adjustable valves 260 and stop valve 270, and outdoor electric expansion valve 280 is opened into the aperture of setting, and stopped the driving (825) of outdoor Air Blast fan 290.Thus, the saturation pressure of outdoor heat converter 220 inside rises.
Then, control part 500 is accepted low voltage value (826) again from low-pressure gas sensor 530.
Then, control part 500 judges that whether low pressure is greater than refrigerating capacity optimization pressure (827).
At this moment, if low pressure greater than refrigerating capacity optimization pressure, then in order to ensure refrigerating capacity with improve performance, control part 500 reduces the aperture of outdoor electric expansion valve 280, the pressure of low-voltage tube 430 is reduced (828).Thus, improve the refrigerating capacity and the performance of refrigeration indoor set 300.Otherwise if low pressure is not more than in refrigerating capacity optimization pressure, then control part 500 increases the aperture of outdoor electric expansion valve 280, thereby improves the refrigerating capacity and the performance (829) of refrigeration indoor set 300.And control part 500 judges whether the heating capacity ratio changes (830).At this moment, heating capacity ratio no change is then carried out and heated is main operation, and the heating capacity ratio changes then to carry out and judges whether that for heating be the step (816) and the step afterwards thereof of main end of run condition.
And, in structure of the present invention, do not have under the situation of receiving vessel 202, the closing function of stop valve 270 can with outdoor electric expansion valve 280 close the control that (full close) realizes same function fully, so also can realize omitting the structure and the control of receiving vessel 202 and stop valve 270.
In sum,, be to prevent that high-pressure gas refrigerant excessively is diverted to the liquid pipe when leading operation heating, thereby prevent the excessive operation of compressor, reduce consumed power according to multi-connected air conditioner and control method thereof of carrying out cooling and warming simultaneously of the present invention.
And, at the heating capacity ratio is that base ratio is when following, under the lower situation of the outdoor temperature that off-premises station is set, outdoor heat converter is not used as evaporimeter, and the saturation pressure that prevents outdoor heat converter is lower than the low-pressure gas pipe pressure inside, thereby the phenomenon that prevents from outdoor heat converter to take place cold-producing medium to be liquefied and stagnate, and the internal pressure that prevents outdoor heat converter excessively reduces, thereby prevents to freeze at indoor heat converter.
Claims (11)
1, a kind of multi-connected air conditioner that carries out cooling and warming simultaneously comprises:
Be connected high-pressure gas pipe, low-pressure gas pipe and liquid pipe between at least one off-premises station and a plurality of cooling and warming conversion group;
The flow control valve that on the isocon that connects between described high-pressure gas pipe and the liquid pipe, is provided with;
Control part, being used for when heating when serving as main operation, if heat ratio for below the base ratio, and the refrigeration required amount of refrigeration indoor set then reduces the aperture of described flow control valve below the benchmark required amount.
2, the multi-connected air conditioner that carries out cooling and warming simultaneously according to claim 1, it is characterized in that also comprising outdoor expansion valve and outdoor Air Blast fan, and described control part utilizes described outdoor expansion valve to carry out degree of superheat control, utilize described outdoor Air Blast fan to carry out low voltage control, and the aperture of regulating described flow control valve according to the average aperture of described refrigeration indoor set.
3, a kind of multi-connected air conditioner that carries out cooling and warming simultaneously comprises:
Be used to detect the outdoor temperature sensor of outdoor temperature;
Be used to detect the low pressure sensor of low-pressure gas pipe internal pressure;
Control part, the outdoor temperature that this control part utilizes described outdoor temperature sensor to detect is calculated the saturation pressure of outdoor heat converter, and the calculation of pressure cold-producing medium stagnation pressure that utilizes described low pressure sensor to detect, and then more described saturation pressure and described cold-producing medium stagnation pressure are stagnated and are prevented operation to carry out the cooling and warming ability and improve operation or to carry out cold-producing medium.
4, the multi-connected air conditioner that carries out cooling and warming simultaneously according to claim 3, it is characterized in that also comprising the flow control valve that is used to regulate flow that is located on the isocon that connects high-pressure gas pipe and liquid pipe, be used to block stop valve and outdoor Air Blast fan to the cold-producing medium of outdoor heat converter side shifting, and described control part is when carrying out cooling and warming ability raising operation, close described flow control valve and described stop valve, and stop described outdoor Air Blast fan.
5, the multi-connected air conditioner that carries out cooling and warming simultaneously according to claim 3, it is characterized in that also comprising the flow control valve that is used to regulate flow that is located on the isocon that connects high-pressure gas pipe and liquid pipe, be used to block stop valve to the cold-producing medium of outdoor heat converter side shifting, and outdoor Air Blast fan, and when described control part prevents to move in the stagnation of execution cold-producing medium, open described flow control valve and described stop valve, stop described outdoor Air Blast fan, and detect low pressure once more,, detected low pressure increases the aperture of described outdoor electric expansion valve if being not more than refrigerating capacity optimization pressure, if described detected low pressure is greater than described refrigerating capacity optimization pressure then reduce the aperture of described outdoor electric expansion valve.
6, a kind of control method of carrying out the multi-connected air conditioner of cooling and warming simultaneously is characterized in that:
Heat and judge when being main operation that the heating capacity ratio is whether more than base ratio;
If described heating capacity ratio not below base ratio, is then regulated the flow that flows the gases at high pressure of liquid-in pipe from high-pressure gas pipe.
7, control method of carrying out the multi-connected air conditioner of cooling and warming simultaneously according to claim 6 is characterized in that described Flow-rate adjustment carries out carrying out degree of superheat control and utilizing the air quantity of outdoor Air Blast fan to regulate and carry out low voltage control and stop valve is opened control for the aperture of the outer electronic expansion valve of: conditioning chamber.
8, control method of carrying out the multi-connected air conditioner of cooling and warming simultaneously according to claim 6, it is characterized in that described Flow-rate adjustment is: the average aperture of calculating the indoor electric expansion valve of refrigeration indoor set, if the average aperture of calculating is not more than the benchmark aperture then reduces flow, if the average aperture of described calculating is greater than the benchmark aperture then increase flow.
9, a kind of control method of carrying out the multi-connected air conditioner of cooling and warming simultaneously, it is characterized in that heating be that main run duration judges that the heating capacity ratio is whether more than base ratio, when described heating capacity ratio during less than base ratio, if the saturation pressure of outdoor heat converter less than the cold-producing medium stagnation pressure of low-pressure gas pipe then carry out cold-producing medium and stagnate and prevent operation, is carried out the cooling and warming ability and is guaranteed operation if the saturation pressure of described outdoor heat converter is not less than the cold-producing medium stagnation pressure of described low-pressure gas pipe.
10, control method of carrying out the multi-connected air conditioner of cooling and warming simultaneously according to claim 9, it is characterized in that described cooling and warming ability guarantees to operate to: close flow control valve and stop valve and stop outdoor Air Blast fan, and calculate the average outlet temperature that heats indoor set, if the described average outlet temperature that heats indoor set less than the optimization temperature then increase the aperture of flow control valve, reduces the aperture of described flow control valve if the described average outlet temperature that heats indoor set is not less than the optimization temperature.
11, control method of carrying out the multi-connected air conditioner of cooling and warming simultaneously according to claim 9, it is characterized in that described cold-producing medium stagnation prevents to operate to: open flows adjustable valve, stop valve, and stop outdoor Air Blast fan, if and the low pressure of described low-pressure gas pipe increases the aperture of described outdoor electric expansion valve greater than the refrigerating capacity optimum pressure then reduce the aperture of outdoor electric expansion valve if the low pressure of described low-pressure gas pipe is not more than the refrigerating capacity optimum pressure.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070061375A KR101176635B1 (en) | 2007-06-22 | 2007-06-22 | Multi air conditioner capable of heating and cooling simultaneously and control method thereof |
| KR10-2007-0061375 | 2007-06-22 | ||
| KR1020070061375 | 2007-06-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101329093A true CN101329093A (en) | 2008-12-24 |
| CN101329093B CN101329093B (en) | 2012-08-08 |
Family
ID=39769399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810082234XA Expired - Fee Related CN101329093B (en) | 2007-06-22 | 2008-02-26 | Multi air-conditioner for simultaneously cooling/heating and method for controlling the same |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2006615A3 (en) |
| KR (1) | KR101176635B1 (en) |
| CN (1) | CN101329093B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR101176635B1 (en) | 2012-08-24 |
| CN101329093B (en) | 2012-08-08 |
| EP2006615A2 (en) | 2008-12-24 |
| KR20080112670A (en) | 2008-12-26 |
| EP2006615A3 (en) | 2015-05-20 |
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