CN104976715A - Air-conditioning system and control method thereof - Google Patents
Air-conditioning system and control method thereof Download PDFInfo
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- CN104976715A CN104976715A CN201510296099.9A CN201510296099A CN104976715A CN 104976715 A CN104976715 A CN 104976715A CN 201510296099 A CN201510296099 A CN 201510296099A CN 104976715 A CN104976715 A CN 104976715A
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- reversal valve
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003507 refrigerant Substances 0.000 claims description 52
- 230000001172 regenerating effect Effects 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 27
- 238000005338 heat storage Methods 0.000 abstract 4
- 238000001514 detection method Methods 0.000 abstract 3
- 239000002918 waste heat Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 7
- 239000002826 coolant Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air-conditioning system and a control method thereof. The air-conditioning system comprises a compressor, a heat storage device, a first return line, a second return line and a detection device, wherein the heat storage device is arranged outside the compressor and sucks waste heat of the compressor; the first return line flows through the heat storage device and then is communicated with a suction end of the compressor; the second return line does not flow through the heat storage device and is directly communicated with the suction end of the compressor; the detection device is arranged at the suction end of the compressor, and detects suction pressure of the compressor, a saturation temperature corresponding to the suction pressure, and a suction temperature of the compressor; and the air-conditioning system can optionally return back to the suction end of the compressor via the first return line or the second return line according to the saturation temperature corresponding to the suction pressure of the compressor, and the suction temperature of the compressor detected by the detection device. According to the air-conditioning system, the suction superheat degree of the compressor can be increased, and a unit still can operate reliably on the low temperature working condition.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of air-conditioning system and control method thereof.
Background technology
Prior art is by increasing a larger gas-liquid separator within air-conditioning systems, and the throttling of conservative control electric expansion valve ensures that compressor has certain suction superheat in program.But when ultralow temperature heats, because outdoor operating mode is lower, outdoor heat exchanger heat transfer effect is deteriorated, and liquid refrigerants cannot absorb heat evaporation completely, the long-term absorbing gas belt liquid of compressor operates, serious curtailments compressor life-span and unit reliability.
Summary of the invention
A kind of air-conditioning system and control method thereof are provided in the embodiment of the present invention, the compressor air suction degree of superheat can be improved more accurately and effectively, ensure that unit still can high efficient and reliable run when worst cold case.
For achieving the above object, the embodiment of the present invention provides a kind of air-conditioning system, comprising: compressor; Regenerative apparatus, is arranged on compressor and absorb the used heat of compressor outward; First return line, is communicated to the suction end of compressor after flowing through regenerative apparatus; Second return line, does not flow through the suction end that regenerative apparatus is directly communicated to compressor; Checkout gear, is arranged on the suction end of compressor, and detects the pressure of inspiration(Pi) of compressor and saturation temperature corresponding to pressure of inspiration(Pi), and the suction temperature of compressor; The suction temperature of the saturation temperature that the pressure of inspiration(Pi) of the compressor that air-conditioning system detects according to checkout gear is corresponding and compressor is selectively back to the suction end of compressor through the first return line or the second return line.
As preferably, air-conditioning system also comprises the first reversal valve, first reversal valve comprises first interface, the second interface, the 3rd interface and the 4th interface, and the second interface and the 3rd interface of the first reversal valve are communicated to regenerative apparatus respectively, and the 4th orifice of the first reversal valve is to the suction end of compressor;
The first interface of the first reversal valve and the 4th orifice and the second interface and the 3rd orifice time, the second return line is formed between the entrance point of the first reversal valve and the suction end of compressor, the first interface of the first reversal valve and the second orifice and the 3rd interface and the 4th orifice time, form the first return line between the entrance point of the first reversal valve and the suction end of compressor.
As preferably, air-conditioning system also comprises: gas-liquid separator, and the 4th interface of the first reversal valve is communicated to compressor by gas-liquid separator; Second reversal valve, the first interface of the second reversal valve is communicated to compressor, and the first interface of the first reversal valve is communicated to the 3rd interface of the second reversal valve.
As preferably, air-conditioning system also comprises First Heat Exchanger and the second heat exchanger, and the second reversal valve also comprises the second interface and the 4th interface, the second orifice of the second reversal valve to First Heat Exchanger, the 4th orifice to the second heat exchanger of the second reversal valve.
As preferably, checkout gear comprise be arranged on compressor air inlet pipe on the low pressure sensor of saturation temperature corresponding to the pressure of inspiration(Pi) and pressure of inspiration(Pi) that detect compressor and the pipe temperature sensor of suction temperature detecting compressor.
According to a further aspect in the invention, provide a kind of control method of above-mentioned air-conditioning system, comprising: step S1: detect the suction temperature of saturation temperature corresponding to the pressure of inspiration(Pi) of compressor and compressor and judge that compressor is the need of raising suction superheat; Step S2: when needing the suction superheat improving compressor, enter step S3; When not needing the suction superheat improving compressor, enter step S4; Step S3: air-conditioning system flows through the first return line, refrigerant flows through and is arranged on the regenerative apparatus that compressor absorbs compressor used heat outward, then enters compressor; Step S4: air-conditioning system flows through the second return line, and refrigerant directly enters compressor without regenerative apparatus; Step S5: return step S1.
As preferably, step S1 comprises: detect outdoor environment temperature T
outer shroudand determine temperature-compensating T
compensate, according to T
outer shroud, T
air-breathing, T
the corresponding saturation temperature of low pressureand/or T
compensatejudge that compressor is the need of raising suction superheat.
As preferably, step S2 comprises: when air-conditioning system is in refrigerating state, if T detected
outer shroud>=a DEG C, then control refrigerant and flow through the second return line, enter step S4; Or when air-conditioning system be in heat state time, if T detected
outer shroud>=d DEG C, then control refrigerant and flow through the first return line, enter step S4, wherein d<a.
As preferably, step S2 comprises: when air-conditioning system is in refrigerating state, if T detected
outer shroud< a DEG C, detects T simultaneously
the corresponding saturation temperature of low pressure>=T
air-breathing+ T
compensate band continue the T1 time, then control refrigerant and flow through the first return line, enter step S3; Or when air-conditioning system be in heat state time, if T detected
outer shroud< d DEG C, detects T simultaneously
the corresponding saturation temperature of low pressure>=T
air-breathing+ T
compensate eand continue the T4 time, then control refrigerant and flow through the first return line, enter step S3.
As preferably, after execution step S1, step S2 also comprises: when air-conditioning system is in refrigerating state, if T detected
outer shroud>=a DEG C also continues the T2 time, or T
the corresponding saturation temperature of low pressure< T
air-breathing+ T
compensate cand continue the T3 time, then control refrigerant and flow through the second return line, enter step S4.
As preferably, after execution step S1, step S2 also comprises: when air-conditioning system be in heat state time, if T detected
outer shroud>=d DEG C also continues the T5 time, or T
the corresponding saturation temperature of low pressure< T
air-breathing+ T
compensate fand continue the T6 time, then control refrigerant and flow through the second return line, enter step S4.
Apply technical scheme of the present invention, air-conditioning system comprises: compressor; Regenerative apparatus, is arranged on compressor and absorb the used heat of compressor outward; First return line, is communicated to the suction end of compressor after flowing through regenerative apparatus; Second return line, does not flow through the suction end that regenerative apparatus is directly communicated to compressor; Checkout gear, is arranged on the suction end of compressor, and detects the pressure of inspiration(Pi) of compressor and saturation temperature corresponding to pressure of inspiration(Pi), and the suction temperature of compressor; The suction temperature of the saturation temperature that the pressure of inspiration(Pi) of the compressor that air-conditioning system detects according to checkout gear is corresponding and compressor is selectively back to compressor through the first return line or the second return line.Because the air-conditioning system suction temperature that is saturation temperature that the pressure of inspiration(Pi) of the compressor detected according to checkout gear is corresponding and compressor selects the return line of circulation, therefore air-conditioning system can be selected whether to flow through regenerative apparatus according to the relation between saturation temperature corresponding to the pressure of inspiration(Pi) of compressor and the suction temperature of compressor, thus the suction superheat of compressor is adjusted, can make air-conditioning system to the adjustment of the suction superheat of compressor more accurately and timely, ensures that unit still can high efficient and reliable run when worst cold case.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of the air-conditioning system of the embodiment of the present invention;
Fig. 2 is the control principle drawing of the air-conditioning system of the embodiment of the present invention;
Fig. 3 is the control procedure figure of the air-conditioning system of the embodiment of the present invention.
Description of reference numerals: 1, compressor; 2, regenerative apparatus; 3, gas-liquid separator; 4, the second reversal valve; 5, the first reversal valve; 6, First Heat Exchanger; 7, the second heat exchanger; 8, low pressure sensor; 9, pipe temperature sensor.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but not as a limitation of the invention.
Shown in Figure 1, according to embodiments of the invention, air-conditioning system comprises compressor 1; Regenerative apparatus 2, is arranged on compressor 1 outer and absorb the used heat of compressor 1; First return line, is communicated to the suction end of compressor 1 after flowing through regenerative apparatus 2; Second return line, does not flow through the suction end that regenerative apparatus 2 is directly communicated to compressor 1; Checkout gear, is arranged on the suction end of compressor 1, and detects the pressure of inspiration(Pi) of compressor 1 and saturation temperature corresponding to pressure of inspiration(Pi), and the suction temperature of compressor 1; The suction temperature of the saturation temperature that the pressure of inspiration(Pi) of the compressor 1 that air-conditioning system detects according to checkout gear is corresponding and compressor 1 is selectively back to the suction end of compressor 1 through the first return line or the second return line.
Because the air-conditioning system suction temperature that is saturation temperature that the pressure of inspiration(Pi) of the compressor 1 detected according to checkout gear is corresponding and compressor 1 selects the return line of circulation, therefore air-conditioning system can be selected whether to flow through regenerative apparatus 2 according to the relation between saturation temperature corresponding to the pressure of inspiration(Pi) of compressor 1 and the suction temperature of compressor 1, thus the suction superheat of compressor 1 is adjusted, can make air-conditioning system to the adjustment of the suction superheat of compressor 1 more accurately and timely, ensures that unit still can high efficient and reliable run when worst cold case.
Air-conditioning system also comprises the first reversal valve 5, first reversal valve comprises first interface a, the second interface b, the 3rd interface c and the 4th interface d, second interface b and the 3rd interface c of the first reversal valve 5 are communicated to regenerative apparatus 2 respectively, and the 4th interface d of the first reversal valve 5 is communicated to the suction end of compressor 1; The first interface a of the first reversal valve 5 is communicated with the 4th interface d and the second interface b is communicated with the 3rd interface c time, the second return line is formed between the entrance point of the first reversal valve 5 and the suction end of compressor 1, the first interface a of the first reversal valve 5 is communicated with the second interface b and the 3rd interface c is communicated with the 4th interface d time, form the first return line between the entrance point of the first reversal valve 5 and the suction end of compressor 1.First reversal valve 5 is preferably four-way change-over valve.
By this first reversal valve 5, can adjust the refrigerant path that air-conditioning system is back to compressor easily, thus easily and timely can adjust the suction superheat of compressor 1, improve the work efficiency of air-conditioning system.
First return line and the second return line also can be realized state and switch by the mode arranging switch valve on pipeline respectively.
The 4th interface d that air-conditioning system also comprises gas-liquid separator 3 and the second reversal valve 4, first reversal valve 5 is communicated to compressor 1 by gas-liquid separator 3; The first interface a of the second reversal valve 4 is communicated to compressor 1, and the first interface a of the first reversal valve 5 is communicated to the 3rd interface C of the second reversal valve 4.Gas-liquid separator 3 is communicated to compressor 1, the refrigerant after vaporized is carried out gas-liquid separation, and gaseous coolant is delivered to compressor.The first interface A of the second reversal valve 4 is communicated to the outlet of compressor 1, flows to refrigerant during refrigerating state for adjusting heating of air-conditioning system.
When air-conditioning system works, if need the suction superheat improving compressor, now can adjust the first reversal valve 5 to the second operating position, refrigerant is after flowing out from the 3rd interface C of the second reversal valve 4, enter in regenerative apparatus 2 through the first interface a of the first reversal valve 5 and the second interface b, after regenerative apparatus 2 heats, flow out from the outlet of regenerative apparatus 2, flow in gas-liquid separator 3 through the 3rd interface c of the first reversal valve 5 and the 4th interface d, then flow back in compressor 1 through gas-liquid separator 3.Because when refrigerant flows in regenerative apparatus 2, temperature gets a promotion, liquid refrigerants can be made to absorb heat further evaporation, therefore gasification degree can be improved after entering gas-liquid separator 3, improve the compressor air suction degree of superheat, avoid the long-term absorbing gas belt liquid running of compressor, ensure that air-conditioning system still can high efficient and reliable be run when worst cold case, promote user's comfortableness and experience.
By arranging regenerative apparatus 2 outside compressor 1, the used heat of compressor 1 can be utilized more fully, improving energy utilization rate, reduce refrigeration cost.By arranging the first reversal valve 5 between the second reversal valve 4 and gas-liquid separator 3, can by the mode of the duty of adjustment first reversal valve, when needing the suction superheat improving compressor 1, regenerative apparatus 2 is utilized to heat the refrigerant entering compressor 1 easily, when not needing the suction superheat improving compressor 1, refrigerant is avoided to flow through regenerative apparatus 2, improve the heat accumulation of regenerative apparatus 2, control convenient, the temperature increase effect of regenerative apparatus 2 pairs of refrigerants can be improved further.
Air-conditioning system also comprises First Heat Exchanger 6 and the second heat exchanger 7, second reversal valve 4 also comprises the second interface B and the 4th interface D, and the second interface B of the second reversal valve 4 is communicated to First Heat Exchanger 6, and the 4th interface D of the second reversal valve 4 is communicated to the second heat exchanger 7.Flow path after second reversal valve 4 can regulate refrigerant to flow out in compressor 1 easily, realize heating and refrigerating function of air-conditioning system, structure is simple, easy to adjust.
In the present embodiment, the second reversal valve 4 and the first reversal valve 5 are cross valve, and cost is lower, technology maturation, controls more safe and reliable.
Checkout gear comprise be arranged on compressor 1 air inlet pipe on the low pressure sensor 8 of saturation temperature corresponding to the pressure of inspiration(Pi) and pressure of inspiration(Pi) that detect compressor 1 and the pipe temperature sensor 9 of suction temperature detecting compressor 1.This low pressure sensor 8 can detect the refrigerant pressure entered in gas-liquid separator 3, is also the pressure of inspiration(Pi) of compressor 1, and obtains corresponding saturation temperature according to this pressure.This pipe temperature sensor 9 is temperature-sensitive bag, can obtain the refrigerant temperature entering compressor 1, is also the suction temperature of compressor 1.By comparing the suction temperature of compressor 1 and the saturation temperature of refrigerant, can determine whether to need the suction superheat to compressor 1 to regulate.
First Heat Exchanger 6 place is also provided with environment temperature temperature-sensitive bag and defrost temperature-sensitive bag, and wherein environment temperature temperature-sensitive bag can detect current outdoor environment temperature, and defrost temperature-sensitive bag can control air-conditioning system and whether enter defrost process.
In conjunction with see shown in Fig. 2 and Fig. 3, according to embodiments of the invention, the control method of air-conditioning system comprises: step S1: the suction temperature detecting saturation temperature corresponding to the pressure of inspiration(Pi) of compressor 1 and compressor, and judges that compressor 1 is the need of raising suction superheat; Step S2: when needing the suction superheat improving compressor 1, enter step S3; When not needing the suction superheat improving compressor 1, enter step S4; Step S3: air-conditioning system flows through the first return line, refrigerant flows through and is arranged on the outer regenerative apparatus 2 absorbing compressor used heat of compressor 1, then enters compressor 1; Step S4: air-conditioning system flows through the second return line, refrigerant directly enters compressor 1 without regenerative apparatus 2; Step S5: return step S1.
By the way, can when needing to improve the suction superheat of compressor 1, the heat utilizing regenerative apparatus 2 to draw from the waste gas of compressor 1 heats refrigerant, improve capacity usage ratio, and improve the service behaviour of air-conditioning system, when not needing to improve the suction superheat of compressor 1, make refrigerant without the need to through regenerative apparatus 2, air-conditioning system keeps normal operating conditions, thus air-conditioning system can be switched back and forth easily between normal operation mode and lifting degree of superheat operational mode.And owing to judging that air-conditioning system is that suction temperature by detecting saturation temperature corresponding to the pressure of inspiration(Pi) of compressor 1 and compressor carries out judging the need of improving the degree of superheat, therefore the adjustment for the suction superheat of compressor 1 more accurately and timely, can improve the overall efficiency of air-conditioning system further.
In the present embodiment, air-conditioning system is at normal operation mode and promote the return flow path realization carrying out between degree of superheat operational mode switching by adjusting refrigerant, is also namely flowed through the first return line by adjustment refrigerant or flowed through the second return line to realize.
In the present embodiment, detect compressor 1 and also comprise the need of raising suction superheat, detect outdoor environment temperature T
outer shroud, determine temperature-compensating T
compensate, then can according to T
outer shroud, T
inhale gas, T
the corresponding saturation temperature of low pressureand/or T
compensatejudge that compressor 1 is the need of raising suction superheat.
Specifically, after air-conditioning system starts, when air-conditioning system is in refrigerating state, second reversal valve 4 must not be electric, and the first interface A of the second reversal valve 4 is communicated with the second interface B, and the 3rd interface C is communicated with the 4th interface D, after refrigerant flows out from compressor 1, through First Heat Exchanger 6 and electric expansion valve, then evaporate in the second heat exchanger 7, the refrigerant flowed out in the second heat exchanger 7 flows to the first reversal valve 5 through the 4th interface D of the second reversal valve 4 and the 3rd interface C.
If now T detected
outer shroud>=a DEG C, then the first reversal valve 5 must not be electric, the first interface a of the first reversal valve 5 is communicated with the 4th interface d, second interface b of the first reversal valve 5 is communicated with the 3rd interface c, air-conditioning system enters step S4, makes refrigerant flow through the second return line, and refrigerant directly enters gas-liquid separator 3 after the first reversal valve 5, and without regenerative apparatus 2, then gaseous coolant flows in compressor 1 from the gas vent of gas-liquid separator 3.A is herein such as 5-15 DEG C, is preferably 10 DEG C.
When air-conditioning system be in heat state time, second reversal valve 4 obtains electric, the first interface A of the second reversal valve 4 is communicated with the 4th interface D, second interface B is communicated with the 3rd interface C, after refrigerant flows out from compressor 1, through the second heat exchanger 7 and electric expansion valve, then evaporate in First Heat Exchanger 6, the refrigerant flowed out in First Heat Exchanger 6 flows to the first reversal valve 5 through the second interface B of the second reversal valve 4 and the 3rd interface C.
If now T detected
outer shroud>=d DEG C, then the first reversal valve 5 must not be electric, the first interface a of the first reversal valve 5 is communicated with the 4th interface d, second interface b of the first reversal valve 5 is communicated with the 3rd interface c, air-conditioning system enters step S4, refrigerant is back to the suction end of compressor 1 through the second return line, and namely refrigerant directly enters gas-liquid separator 3 after the first reversal valve 5, and then gaseous coolant flows to the suction end of compressor 1 from the gas vent of gas-liquid separator 3.
D herein is such as-10-0 DEG C, is preferably-5 DEG C.
After air-conditioning system starts, when air-conditioning system is in refrigerating state, if T detected
outward ring< a DEG C, if detect T simultaneously
the corresponding saturation temperature of low pressure>=T
air-breathing+ T
compensate band continue the T1 time, then the first reversal valve 5 obtains electric, the first interface a of the first reversal valve 5 is communicated with the second interface b, 3rd interface c is communicated with the 4th interface d, air-conditioning system enters step S3, refrigerant is back to the suction end of compressor 1 through the first return line, specifically, refrigerant enters in regenerative apparatus 2 after the first interface a and the second interface b of the first reversal valve 5, carry out heat temperature raising in regenerative apparatus 2 after, gas-liquid separator 3 is flowed to through the 3rd interface c and the 4th interface d, then gaseous coolant flows in compressor 1 from the gas vent of gas-liquid separator 3.T herein
mend repay bfor corresponding to T now
air-breathingcompensation temperature.
A is herein such as 5-15 DEG C, is preferably 10 DEG C, and T1 is such as 5 minutes, and the numerical value of a herein and the numerical value of T1 can be set by staff according to the actual working environment of air-conditioning system.
In air-conditioning system running, when the first reversal valve 5 obtains electric, after namely air-conditioning system enters step S3, refrigerant flows through the suction end that the first return line is back to compressor 1, and air-conditioning system continues to return step S1 and detects, if now T detected
outer shroud>=a DEG C also continues the T2 time, or T
the corresponding saturation temperature of low pressure< T
air-breathing+ T
compensate cand continue the T3 time, then control the first reversal valve 5 power down, now the first interface a of the first reversal valve 5 is communicated with the 4th interface d, second interface b of the first reversal valve 5 is communicated with the 3rd interface c, air-conditioning system enters step S4, refrigerant is directly back to the suction end of compressor 1 through the second return line, recover normal operation mode.T herein
compensate cfor corresponding to T now
air-breathingcompensation temperature.
A is herein such as 5-15 DEG C, is preferably 10 DEG C, T2 and T3 is such as 5 minutes, and the numerical value of a herein and the numerical value of T2, T3 can be set by staff according to the actual working environment of air-conditioning system.
After the first reversal valve 5 power down, now the first interface a of the first reversal valve 5 is communicated with the 4th interface d, second interface b of the first reversal valve 5 is communicated with the 3rd interface c, refrigerant is directly back to the suction end of compressor 1 through the second return line, now air-conditioning system is back to step S1, continues to judge whether that reaching the first reversal valve 5 obtains electric condition according to testing result.
Air-conditioning system be in heat state time, if T detected
outer shroud< d DEG C, if detect T
the corresponding saturation temperature of low pressure>=T
air-breathing+ T
compensate eand continue the T4 time, then the first reversal valve 5 obtains electric, the first interface a of the first reversal valve 5 is communicated with the second interface b, 3rd interface c is communicated with the 4th interface d, air-conditioning system enters step S3, and refrigerant enters in regenerative apparatus 2 after the first reversal valve 5, carry out heat temperature raising in regenerative apparatus 2 after, flow to gas-liquid separator 3, then gaseous coolant flows in compressor 1 from the gas vent of gas-liquid separator 3.T herein
compensate efor corresponding to T now
air-breathingcompensation temperature.
D herein is such as-10-0 DEG C, is preferably-5 DEG C, and T4 is such as 5 minutes, and the numerical value of d herein and the numerical value of T4 can be set by staff according to the actual working environment of air-conditioning system.
When air-conditioning system be in heat state time, when the first reversal valve 5 electric, refrigerant enters compressor 1 through the first return line, when namely air-conditioning system enters step S3, continues to return step S1 and detects, if now T detected
outer shroud>=d DEG C also continues the T5 time, or T
the corresponding saturation temperature of low pressure< T
air-breathing+ T
compensate fand continue the T6 time, then the first reversal valve 5 power down, the first interface a of the first reversal valve 5 is communicated with the 4th interface d, second interface b of the first reversal valve 5 is communicated with the 3rd interface c, refrigerant flows through the suction end that the second return line enters compressor 1, air-conditioning system enters step S4, recovers normal operation mode.
D herein is such as-10-0 DEG C, is preferably-5 DEG C, and T5 is such as 5 minutes, and T6 is such as 5 minutes, and the numerical value of d herein and the numerical value of T5, T6 can be set by staff according to the actual working environment of air-conditioning system.T herein
compensate ffor corresponding to T now
air-breathingcompensation temperature.
After the first reversal valve 5 power down, the first interface a of the first reversal valve 5 is communicated with the 4th interface d, second interface b of the first reversal valve 5 is communicated with the 3rd interface c, air-conditioning system replys normal operation mode, and be back to step S1, continue to judge whether that reaching the first reversal valve 5 obtains electric condition according to testing result.
Relation between above-mentioned d and a value should meet d<a.
When detecting that air-conditioning system is in defrost process, needing maintenance first reversal valve 5 to be in power-down state, also namely keeping air-conditioning system to be in normal operation mode.
In addition, the time interval of the first reversal valve 5 power on and off must meet the demands, that is:
After first reversal valve 5 powers on, at least run and just can judge whether power down in T7 minute; After first reversal valve 5 power down, at least interval T just can judge whether to power on for 8 minutes, thus ensures that air-conditioning system temperature detects the validity of data.T7 is herein such as 5 minutes, and T8 is such as 30 minutes.
Certainly, be more than the preferred embodiment of the present invention.It should be pointed out that for those skilled in the art, under the prerequisite not departing from its general principles, can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (11)
1. an air-conditioning system, is characterized in that, comprising:
Compressor (1);
Regenerative apparatus (2), is arranged on described compressor (1) and absorb the used heat of described compressor (1) outward;
First return line, is communicated to the suction end of described compressor (1) after flowing through described regenerative apparatus (2);
Second return line, does not flow through the suction end that described regenerative apparatus (2) is directly communicated to described compressor (2);
Checkout gear, is arranged on the suction end of described compressor (1), and detects the pressure of inspiration(Pi) of described compressor (1) and saturation temperature corresponding to pressure of inspiration(Pi), and the suction temperature of described compressor (1);
The suction temperature of the saturation temperature that the pressure of inspiration(Pi) of the compressor (1) that described air-conditioning system detects according to described checkout gear is corresponding and compressor (1) is selectively back to the suction end of described compressor (1) through described first return line or described second return line.
2. air-conditioning system according to claim 1, it is characterized in that, described air-conditioning system also comprises the first reversal valve (5), described first reversal valve (5) comprises first interface, the second interface, the 3rd interface and the 4th interface, second interface and the 3rd interface of described first reversal valve (5) are communicated to described regenerative apparatus (2) respectively, and the 4th orifice of described first reversal valve (5) is to the suction end of described compressor (1);
The first interface of described first reversal valve (5) and the 4th orifice and the second interface and the 3rd orifice time, described second return line is formed between the entrance point of described first reversal valve (5) and the suction end of described compressor (1), the first interface of the first reversal valve (5) and the second orifice and the 3rd interface and the 4th orifice time, form described first return line between the entrance point of described first reversal valve (5) and the suction end of described compressor (1).
3. air-conditioning system according to claim 2, is characterized in that, described air-conditioning system also comprises:
Gas-liquid separator (3), the 4th interface of described first reversal valve (5) is communicated to described compressor (1) by described gas-liquid separator (3);
Second reversal valve (4), the first interface of described second reversal valve (4) is communicated to described compressor (1), and the first interface of described first reversal valve (5) is communicated to the 3rd interface of described second reversal valve (4).
4. air-conditioning system according to claim 3, it is characterized in that, described air-conditioning system also comprises First Heat Exchanger (6) and the second heat exchanger (7), described second reversal valve (4) also comprises the second interface and the 4th interface, second orifice of described second reversal valve (4) to First Heat Exchanger (6), the 4th orifice to the second heat exchanger (7) of described second reversal valve (4).
5. air-conditioning system according to claim 1, it is characterized in that, described checkout gear comprise be arranged on described compressor (1) air inlet pipe on the low pressure sensor (8) of saturation temperature corresponding to the pressure of inspiration(Pi) and pressure of inspiration(Pi) that detect described compressor (1) and the pipe temperature sensor (9) of suction temperature detecting described compressor (1).
6. a control method for the air-conditioning system according to any one of claim 1 to 5, is characterized in that, comprising:
Step S1: detect the saturation temperature corresponding to pressure of inspiration(Pi) of compressor (1) and the suction temperature of compressor and judge that compressor (1) is the need of raising suction superheat;
Step S2: when needing the suction superheat improving compressor (1), enter step S3; When not needing the suction superheat improving compressor (1), enter step S4;
Step S3: air-conditioning system flows through the first return line, refrigerant flows through and is arranged on the regenerative apparatus (2) that compressor (1) absorbs compressor used heat outward, then enters compressor (1);
Step S4: air-conditioning system flows through the second return line, refrigerant directly enters compressor (1) without regenerative apparatus (2);
Step S5: return step S1.
7. the control method of air-conditioning system according to claim 6, is characterized in that, described step S1 also comprises:
Detect outdoor environment temperature T
outer shroudand determine temperature-compensating T
compensate, according to T
outer shroud, T
air-breathing, T
the corresponding saturation temperature of low pressureand/or T
compensatejudge that compressor (1) is the need of raising suction superheat.
8. the control method of air-conditioning system according to claim 7, is characterized in that, described step S2 comprises: when air-conditioning system is in refrigerating state, if T detected
outer shroud>=a DEG C, then control refrigerant and flow through the second return line, enter step S4; Or when air-conditioning system be in heat state time, if T detected
outer shroud>=d DEG C, then control refrigerant and flow through the first return line, enter step S4, wherein d<a.
9. the control method of air-conditioning system according to claim 7, is characterized in that, described step S2 comprises: when air-conditioning system is in refrigerating state, if T detected
outer shroudt is detected while < a DEG C
the corresponding saturation temperature of low pressure>=T
air-breathing+ T
compensate band continue the T1 time, then control refrigerant and flow through the first return line, enter step S3; Or when air-conditioning system be in heat state time, if T detected
outer shroud< d DEG C, detects T simultaneously
the corresponding saturation temperature of low pressure>=T
air-breathing+ T
compensate eand continue the T4 time, then control refrigerant and flow through the first return line, enter step S3.
10. the control method of air-conditioning system according to claim 7, is characterized in that, after the described step S1 of execution, described step S2 also comprises: when air-conditioning system is in refrigerating state, if T detected
outer shroud>=a DEG C also continues the T2 time, or T
the corresponding saturation temperature of low pressure< T
air-breathing+ T
compensate cand continue the T3 time, then control refrigerant and flow through the second return line, enter step S4.
The control method of 11. air-conditioning systems according to claim 7, is characterized in that, execution described step S1 after, described step S2 also comprises: when air-conditioning system be in heat state time, if T detected
outer shroud>=d DEG C also continues the T5 time, or T
the corresponding saturation temperature of low pressure< T
air-breathing+ T
compensate fand continue the T6 time, then control refrigerant and flow through the second return line, enter step S4.
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