CN106895595A - A kind of two grades of air-conditioning system with enthalpy increased through vapor injection and control method thereof - Google Patents
A kind of two grades of air-conditioning system with enthalpy increased through vapor injection and control method thereof Download PDFInfo
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- CN106895595A CN106895595A CN201610037117.6A CN201610037117A CN106895595A CN 106895595 A CN106895595 A CN 106895595A CN 201610037117 A CN201610037117 A CN 201610037117A CN 106895595 A CN106895595 A CN 106895595A
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- tonifying
- branch road
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- supplementing opening
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
Abstract
The present invention provides a kind of air-conditioning system, more particularly to a kind of heat pump type air conditioning system, including screw compressor, condenser, evaporator, economizer, throttling arrangement and pipe-line control valve, wherein it is used as the tonifying Qi of the system compressors by the refrigerant after economizer evaporation, and point have the first tonifying Qi branch road and the second tonifying Qi branch road, wherein the first tonifying Qi branch road is connected to the gas supplementing opening at the low pressure (LP) cylinder of screw compressor, second tonifying Qi branch road is connected to the gas supplementing opening at screw compressor higher pressure, the system also includes the control system for controlling valve to switch on and off in control tonifying Qi branch road.By the present invention can either meet simultaneously air-conditioning system normally with cryogenic conditions under heating performance and condition of ultralow temperature are improved by Gas-supplying enthalpy-increasing under by two demands with liquid tonifying Qi reduction compressor exhaust temperature, the heating needs under more low temperature environment can also be met, the application condition range using the air-conditioning system of screw compressor has been widened.The invention further relates to the control method of the air-conditioning system.
Description
Technical field
The invention belongs to refrigeration technology field, and in particular to a kind of twin-stage Gas-supplying enthalpy-increasing system and its control method.
Background technology
At present, it is adapted to improve under cryogenic the demand of heating capacity and COP using the source pump of two-stage enthalpy increasing technology, but under condition of ultralow temperature, compressor exhaust temperature can be then caused to raise, can easily exceed the permission outlet air temperature of compressor, the serious lubricating oil that will cause fails, and compressor burns.So, the situation that this ultralow temperature is heated reduces compressor exhaust temperature raising system reliability more important than improving heating capacity and COP.
In addition, the tonifying Qi position of the Gas-supplying enthalpy-increasing mouthful of Normal squeezing machine is according to certain operating condition design, position once it is determined that, its effect is also just relative to be determined, this also has led to Gas-supplying enthalpy-increasing double-stage compressor system now under conditions of adapting to improve heating capacity and COP, it is impossible to adapt to the demand that ultralow temperature heats reliability.
The content of the invention
The present invention provides a kind of air-conditioning system, more particularly to a kind of heat pump type air conditioning system, including one-level throttling air-conditioning system with enthalpy increased through vapor injection and two-step throttle air-conditioning system with enthalpy increased through vapor injection；The air-conditioning system includes screw compressor, condenser, evaporator, economizer, control valve on throttling arrangement and tonifying Qi branch road, wherein it is used as the tonifying Qi of the system compressors by the refrigerant after economizer evaporation, and point have the first tonifying Qi branch road and the second tonifying Qi branch road, wherein the first tonifying Qi branch road is connected to the gas supplementing opening at the low pressure (LP) cylinder of screw compressor, second tonifying Qi branch road is connected to the gas supplementing opening at screw compressor higher pressure, pressure of the pressure of second gas supplementing opening more than the first gas supplementing opening, the control system that the system is also switched on and off including magnetic valve in control two-way tonifying Qi branch road.
Preferably, the compressor is screw compressor.
Preferably, the tonifying Qi branch road control valve is magnetic valve.
Preferably, the throttling arrangement is electric expansion valve.
Preferably, the economizer is plate type heat exchanger or flash vessel.
Preferably, the air-conditioning system has two-way tonifying Qi branch road, i.e. the first tonifying Qi branch road and the second tonifying Qi branch road.
Preferably, the control valve system includes the first gas supply control valve being arranged on the first tonifying Qi branch road and the second gas supply control valve being arranged on the second tonifying Qi branch road.
Preferably, two gas supplementing openings in the first tonifying Qi branch road correspondence screw compressor, two gas supplementing openings are arranged on the both sides of exhaust outlet, and superfeed pressure is identical.
Preferably, two gas supplementing openings in the second tonifying Qi branch road correspondence screw compressor, two gas supplementing openings are arranged on the both sides of exhaust outlet, and superfeed pressure is identical.
Preferably, the exhaust end of the economizer is connected to described the first tonifying Qi branch road and the second tonifying Qi branch road by a total tonifying Qi branch road branch.
Preferably, the superfeed pressure of the superfeed pressure more than the first tonifying Qi branch road correspondence gas supplementing opening of the second tonifying Qi branch road correspondence gas supplementing opening.
Preferably, the air-conditioning system reduces the suction temperature of hiigh pressure stage when ultralow temperature heating mode is run using with liquid tonifying Qi.
Preferably, the one-level throttling Gas-supplying enthalpy-increasing system is improved superfeed pressure using the throttle valve opening of increase bypass line when ultralow temperature is heated or realizes band liquid tonifying Qi.
Preferably, the two-step throttle Gas-supplying enthalpy-increasing system improves superfeed pressure when ultralow temperature is heated by the way of one-level throttle valve opening is increased.
Preferably, the first tonifying Qi branch road and the second tonifying Qi branch road control break-make by controlling valve.
Preferably, when the economizer is plate type heat exchanger, bypass evaporation stream and primary flow path strengthen heat exchange therebetween for counter-flow designs.
Preferably, the air-conditioning system runs the control valve for constantly opening the first tonifying Qi branch road in normal or worst cold case, closes the control valve of the second tonifying Qi branch road.
Preferably, the air-conditioning system runs the control valve for constantly opening the second tonifying Qi branch road in ultralow-temperature operation conditions, closes the gas supply control valve of tie point.
Preferably, when the air-conditioning system is two grades of Gas-supplying enthalpy-increasing systems, at least being switched on or switched off all the way in control valve system control two-way tonifying Qi branch road.
Preferably, when the air-conditioning system is one stage of compression system, control valve system control two-way tonifying Qi branch road is all off.
Preferably, the air-conditioning system can be one-level throttling air-conditioning system with enthalpy increased through vapor injection or two-step throttle air-conditioning system with enthalpy increased through vapor injection.
Preferably, the air-conditioning system is air source heat pump or Teat pump boiler.
The refrigeration system and its control method that the present invention is provided have the advantages that：
1. disclosure satisfy that refrigeration system is improved under heating performance and condition of ultralow temperature by two demands with liquid tonifying Qi reduction compressor exhaust temperature by Gas-supplying enthalpy-increasing under cryogenic；
2. the operational reliability of low-temperature heating performance and ultralow-temperature operation conditions has been taken into account, has been widened using the application condition range of screw compressor air-conditioning system；
3. the bigger heat absorption temperature difference can be obtained on the basis of reliability is ensured and the heating operation under more worst cold case environment is realized；
4. operation demand of the heat pump air conditioner under the bigger temperature difference disclosure satisfy that.
Brief description of the drawings
Fig. 1 one-levels throttling twin-stage Gas-supplying enthalpy-increasing heat pump machine system schematic.
One-level throttling twin-stage Gas-supplying enthalpy-increasing heat pump machine system lgP-h schematic diagrames of the Fig. 2 with delivery temperature as restrictive condition（Solid line：Normal and worst cold case；Dotted line：Ultralow-temperature operation conditions）.
One-level throttling twin-stage Gas-supplying enthalpy-increasing heat pump machine system lgP-h schematic diagrames of the Fig. 3 with evaporating pressure as qualifications.
One-level throttling twin-stage Gas-supplying enthalpy-increasing heat pump machine system lgP-h schematic diagrames of the Fig. 4 with evaporating pressure and pressure at expulsion as qualifications.
Fig. 5 two-step throttle twin-stage Gas-supplying enthalpy-increasing heat pump machine system schematics.
Two-step throttle twin-stage Gas-supplying enthalpy-increasing heat pump machine system lgP-h schematic diagrames of the Fig. 6 with delivery temperature as restrictive condition（Solid line：Normal and worst cold case；Dotted line：Ultralow-temperature operation conditions）.
Two-step throttle twin-stage Gas-supplying enthalpy-increasing heat pump machine system lgP-h schematic diagrames of the Fig. 7 with evaporating pressure as qualifications.
Two-step throttle twin-stage Gas-supplying enthalpy-increasing heat pump machine system lgP-h schematic diagrames of the Fig. 8 with evaporating pressure and pressure at expulsion as qualifications.
Fig. 9 low temperature heats the location arrangements schematic diagram of twin-stage Gas-supplying enthalpy-increasing system scroll plate compressor gas supplementing opening with ultralow temperature.
Reference is expressed as in figure：1. normal, low-temperature heating gas supplementing opening；2. ultralow temperature heats gas supplementing opening；3. normal, low-temperature heating gas supplementing opening；4. ultralow temperature heats gas supplementing opening；5. fixed scroll；6. movable orbiting scroll.
Specific embodiment
This programme increased an other Gas-supplying enthalpy-increasing stream exclusively for the design of ultralow temperature heating condition again in original twin-stage Gas-supplying enthalpy-increasing heat pump, by the switchover operation of the two, while so that meeting high heating capacity and COP under worst cold case using the heat pump machine of the system, it is also possible to adapt to the requirement of ultralow-temperature operation conditions reliability of operation；Meanwhile, also provide the technique direction for obtaining the bigger heat absorption temperature difference and bigger operational difference.
System diagram as shown in Fig. 1 Fig. 5, the improvement of this programme shows as in system diagram：The tonifying Qi branch road of original Gas-supplying enthalpy-increasing source pump is divided into two branch roads, one is connected to original gas supplementing opening, and another branch road is connected to the more high-pressure side gas supplementing opening than preceding tonifying Qi branch road correspondence gas supplementing opening（Particular location is selected by actual working conditions design）.
Scroll plate gas supplementing opening corresponding relation as shown in Figure 3, offers two pairs of gas supplementing openings, wherein gas supplementing opening in the Machining of Vortex Disk of Vortex Compressor in this programme（1）&（3）Tonifying Qi when being run for normal or low-temperature heating, for improving heating capacity and COP；This pair of gas supplementing opening is correspondingly arranged the tonifying Qi branch road of magnetic valve 1；Gas supplementing opening（2）&（4）Compare（1）&（3）It is the gas supplementing opening at higher pressure；Tonifying Qi during for ultralow temperature heating operation, while Gas-supplying enthalpy-increasing, is mainly used in reducing the delivery temperature of compressor；Its tonifying Qi branch road for being correspondingly arranged magnetic valve 2.Superfeed pressure requirement at the corresponding gas supplementing opening of same tonifying Qi branch road is identical, and its particular location is chosen according to actual working conditions.
In running, the difference of the throttling sum of series purpose of design according to the invention air-conditioning system improves the reliability of air-conditioning system the invention provides the one-level throttling Gas-supplying enthalpy-increasing system and two-step throttle Gas-supplying enthalpy-increasing system that meet with delivery temperature as restrictive condition；One-level throttling Gas-supplying enthalpy-increasing system and two-step throttle Gas-supplying enthalpy-increasing system with evaporating pressure as qualifications increase the heat absorption temperature difference, improve adaptability of the system under more low temperature environment；Throttled Gas-supplying enthalpy-increasing system and two-step throttle Gas-supplying enthalpy-increasing system with the one-level with evaporating pressure and pressure at expulsion as qualifications, make the air-conditioning system that the operation temperature difference this several situation of maximum are issued in above-mentioned pressure qualifications；The one-level throttling Gas-supplying enthalpy-increasing system and two-step throttle Gas-supplying enthalpy-increasing system with delivery temperature as restrictive condition are highlighted herein in nominal situation and the running of ultralow-temperature operation conditions, other situations are all to be designed according to particular demands on this basis, highlight implementation method.
Under the conditions of the nominal situation such as normal temperature and low temperature, it is main target to improve heating capacity and COP.The first tonifying Qi branch way solenoid valve is now opened, the second tonifying Qi branch way solenoid valve is closed, makes system operation normal flow.
For the nominal situation condition such as normal temperature and low temperature next stage throttling Gas-supplying enthalpy-increasing system,The system diagram corresponding diagram 1 of the flow, the solid line in pressure-enthalpy chart corresponding diagram 2, endless form is：The refrigerant of the low-temp low-pressure with certain degree of superheat（State point 1）It is inhaled into compressor；Through first paragraph cavity（That is low-pressure stage）Become the medium temperature and medium pressure gas with certain degree of superheat after compression（State point 2）；Now, by with gas supplementing opening（1）&（3）The refrigerant for covering（State point 4）After mixing（State point 3）；By the second half section（Hiigh pressure stage）Become the refrigerant of the HTHP of the degree of superheat higher after compression（State point 5）；Through evaporator（Now as condenser）After heat release, become the liquid refrigerant with certain degree of supercooling（State point 6）, out it is divided into two streams afterwards from condenser；It is all the way major loop, it is by economizer（It is now plate type heat exchanger）Become the liquid refrigerant of more high supercooling degree after heat exchange（State point 8）, the two phase refrigerant of low-temp low-pressure is then become after heating electric expansion valve throttling（State point 9）；By condenser（Now equivalent to evaporator）After evaporation endothermic, the low-temperature low-pressure refrigerant with certain degree of superheat is become again（State point 1）Compression is gone by compressor inspiration, a major cycle is completed.
And another branch road is used as tonifying Qi, it first passes through the two phase refrigerant for becoming low-temp low-pressure after electric expansion valve throttles（State point 7）Into economizer evaporation, the heat for absorbing main refrigerant circuit becomes in dry saturated steam or wet saturated steam or the dry saturated steam with certain degree of superheat（State point 4）With the medium temperature and medium pressure gas in compressor（State point 2）Mixing（State point 3）；（According to the difference of state point 4, state point 3 is probably dry saturated steam or the dry saturated steam with certain degree of superheat；When state point 4 is more with liquid, it is also possible to wet saturated steam）；This some vapor may proceed to be compressed, until discharge compressor (state point 5) completes tonifying Qi circulation.
For two-step throttle Gas-supplying enthalpy-increasing system under the conditions of the nominal situations such as normal temperature and low temperature, the system diagram corresponding diagram 5 of the flow, the solid line in pressure-enthalpy chart corresponding diagram 6, endless form is：The refrigerant of the low-temp low-pressure with certain degree of superheat（State point 1）It is inhaled into compressor；Through first paragraph cavity（That is low-pressure stage）Become the medium temperature and medium pressure gas with certain degree of superheat after compression（State point 2）；Now, by with gas supplementing opening（1）&（3）The refrigerant for covering（State point 4）After mixing（State point 3）；By the second half section（Hiigh pressure stage）Become the refrigerant of the HTHP of the degree of superheat higher after compression（State point 5）；Through evaporator（Now as condenser）After heat release, become the liquid refrigerant with certain degree of supercooling（State point 6）, after being throttled through a nuclear one-stage throttling device（State point 7）In economizer（It is now flash vessel）Middle shwoot, after some refrigerant shwoot, a part forms the saturation refrigerant liquid of intermediate pressure（State point 8）, part formation saturated vapor；Form the refrigerant liquid of intermediate pressure saturated mode（State point 8）By two-step throttle device（Electric expansion valve）Throttling, forms the two phase refrigerant of low-temp low-pressure（State point 9）, by condenser（Now equivalent to evaporator）After evaporation endothermic, the low-temperature low-pressure refrigerant with certain degree of superheat is become again（State point 1）Compression is gone by compressor inspiration, a major cycle is completed.
The vapor refrigerant for forming saturated mode is then used as the tonifying Qi of the system, according to the final tonifying Qi of compressor（State point 4）Whether with liquid, tonifying Qi is probably the medium temperature and medium pressure gas in dry saturated steam or wet saturated steam, with compressor（State point 2）Mixing（State point 3）；（According to the difference of state point 4, state point 3 is probably dry saturated steam or the dry saturated steam with certain degree of superheat；When state point 4 is more with liquid, it is also possible to wet saturated steam）；This some vapor may proceed to be compressed, until discharge compressor (state point 5) completes tonifying Qi circulation.
Under the conditions of ultralow temperature heating condition,Because now internal-external temperature difference is big, suction pressure of compressor reduction, it can be seen from macroscopic property according to gas, now the delivery temperature of compressor will be raised, this is very unfavorable for compressor, and temperature exceedes permissible value, easily causes compressor oil thinning or is carbonized, make lubrication failure, ultimately result in compressor fault.So, under the conditions of this, the delivery temperature for reducing compressor is main target.Now operation ultralow temperature heats circulation, opens the second tonifying Qi branch way solenoid valve, closes the first tonifying Qi branch way solenoid valve.
For ultralow temperature heating condition condition next stage throttling Gas-supplying enthalpy-increasing system, the system diagram corresponding diagram 1 of the flow, the dotted line in pressure-enthalpy chart corresponding diagram 2.Endless form is identical with the endless form of one-level throttling Gas-supplying enthalpy-increasing system nominal situation；The difference is that because the position of corresponding Gas-supplying enthalpy-increasing mouthful is different, loop parameter of corresponding tonifying Qi parameter and each point has changed（Corresponding states point is changed into the point with skimming）；Wherein, most can be intuitively to find out, superfeed pressure now improves；Because gas supplementing opening now is located at higher pressure, the superfeed pressure for now needing can be relatively big before；Again due to the raising of superfeed pressure, needing condenser will out open greatly by the electronic expansion valve opening of economizer evaporation stream afterwards, while ensureing to improve superfeed pressure, also cause liquid incomplete evaporation, make gas supplementing opening band liquid tonifying Qi, to reduce the suction temperature of high pressure chest（Because now to reduce pressure at expulsion as main target）；On the other hand, because the heat absorption of bypass evaporation stream is not enough, cause to enter condenser（It is now evaporator）The specific enthalpy of refrigerant increase, reduce the caloric receptivity of evaporation, cause the heating capacity of now two-stage enthalpy increasing system to compare the very little improved for single level system.But because the suction temperature of now hiigh pressure stage is lowered by so that the delivery temperature of compressor is reduced（Now state point 5 ' is low compared with the temperature of state point 5）, it is ensured that stable operation of the compressor under ultralow temperature heating condition.
For two-step throttle Gas-supplying enthalpy-increasing system under the conditions of ultralow temperature heating condition, the system diagram corresponding diagram 5 of the flow, the dotted line in pressure-enthalpy chart corresponding diagram 6.Endless form is identical with the endless form of two-step throttle Gas-supplying enthalpy-increasing system nominal situation；Likewise, improve due to now corresponding to the superfeed pressure of compressor gas supplementing opening, so needing economizer（It is now flash vessel）Preceding throttling arrangement（Electric expansion valve）Aperture will be opened greatly to improve superfeed pressure；On the other hand, due to now needing band liquid tonifying Qi, this is accomplished by drawing a part of saturation liquid refrigerant from flash vessel and is filled into from the more on high-tension side gas supplementing opening of compressor together with gaseous refrigerant, to reduce the suction temperature of compressor high pressure cylinder, the final delivery temperature for reducing compressor（Now state point 5 ' is low compared with the temperature of state point 5）, enhance ultralow temperature reliability of operation.
The present invention program with delivery temperature as restrictive condition one-level throttling Gas-supplying enthalpy-increasing system and two-step throttle Gas-supplying enthalpy-increasing system on the basis of, by certain design adjusting method can expand acquisition with other performances be purpose heat pump.
The one-level with evaporating pressure as qualifications throttling Gas-supplying enthalpy-increasing system and two-step throttle Gas-supplying enthalpy-increasing system for example shown in Fig. 3 Fig. 7, the delivery temperature of compressor can be reduced due to the present invention, under the work condition environment of more low temperature, can be by further reducing evaporating pressure（Reduce evaporating temperature）To obtain the larger heat absorption temperature difference, the heating needs under more low temperature environment are met.
The one-level with evaporating pressure and condensing pressure as qualifications throttling Gas-supplying enthalpy-increasing system and two-step throttle Gas-supplying enthalpy-increasing system for example shown in Fig. 4 Fig. 8, the delivery temperature of compressor can be reduced due to the present invention, in the case where pressure condition is allowed, can be obtained with the operation temperature difference under pressure limit condition by designing, ideally, the bigger operation temperature difference can be obtained.
Preferably, the air-conditioning system uses screw compressor.
Preferably, the control valve uses magnetic valve, and system control is realized to facilitate.
Preferably, the throttling arrangement uses electric expansion valve, to facilitate the regulation of throttle opening.
Preferably, when the air-conditioning system is one-level throttling Gas-supplying enthalpy-increasing system, using plate type heat exchanger as economizer.
Preferably, when the air-conditioning is two-step throttle Gas-supplying enthalpy-increasing system, using flash vessel as economizer.
Preferably, the economizer exhaust end is to be connected to the first tonifying Qi branch road and the second tonifying Qi branch road by a total tonifying Qi branch road branch, the first tonifying Qi branch road other end is connected to the exhaust outlet 1 and exhaust outlet 3 of the compressor,, the other end of the second tonifying Qi branch road is connected to the exhaust outlet 2 and exhaust outlet 4 of the compressor.
Preferably, the control valve system includes the first gas supply control valve 1 being arranged on the first tonifying Qi branch road.Break-make that can be effectively to the first tonifying Qi branch road by the first gas supply control valve being arranged on the first tonifying Qi branch road is controlled effect.
Preferably, the control valve system also includes the second gas supply control valve 2 being arranged on the second tonifying Qi branch road.Break-make that can be effectively to the second tonifying Qi branch road by the second gas supply control valve being arranged on the second tonifying Qi branch road is controlled effect.
Preferably, at least being switched on or switched off all the way in the control valve system control two-way tonifying Qi branch road of the air-conditioning system.
Preferably, two superfeed pressures of the first tonifying Qi branch road correspondence equal gas supplementing opening 1 and gas supplementing opening 3, and two gas supplementing openings are separately positioned on two compression chambers of synchronization.The purpose one for so setting be in order to two different minimum cylinder volumes being compressed to screw compressor simultaneously between while carry out tonifying Qi effect, the efficiency of raising Gas-supplying enthalpy-increasing and effect, two is in order that compressor uniform force, smooth running.
Preferably, two superfeed pressures of the second tonifying Qi branch road correspondence equal gas supplementing opening 2 and gas supplementing opening 4, and two gas supplementing openings are separately positioned on two compression chambers of synchronization.The purpose one for so setting be in order to two different minimum cylinder volumes being compressed to screw compressor simultaneously between while carry out tonifying Qi effect, the efficiency of raising Gas-supplying enthalpy-increasing and effect, two is in order that compressor uniform force, smooth running.
Preferably, pressure is more than the pressure at the corresponding gas supplementing opening of the first tonifying Qi branch road at the corresponding gas supplementing opening of the second tonifying Qi branch road.
Preferably, when the economizer is refrigerant discontiguous plate type heat exchanger, it is additionally provided with major loop and throttling arrangement is provided with bypass line, and bypass line, enables to economizer to play a part of intermediate heat transfer by above-mentioned bypass throttle device and corresponding annexation.
Preferably, when the economizer is the flash vessel of refrigerant contact, pipeline is provided with a nuclear one-stage throttling device before economizer；Two-step throttle device is provided with after economizer.
Preferably, the air-conditioning system, when super low temperature refrigeration operating mode is run, plate type heat exchanger increases as the aperture of the bypass line electric expansion valve of economizer, the purpose one of do so is that, in order to increase superfeed pressure, two is in order that tonifying Qi can reduce the temperature of hiigh pressure stage air-breathing with liquid.
Preferably, the air-conditioning system, when super low temperature refrigeration operating mode is run, when flash vessel is as economizer, the aperture increase of one-level choke valve, the purpose for the arrangement is that in order to increase superfeed pressure.
Preferably, the air-conditioning system is air source heat pump or Teat pump boiler.
The present invention also provides a kind of control method of air-conditioning system, its using foregoing air-conditioning system for regulation is controlled it under different working conditions, can reach at the same meet air-conditioning system under cryogenic by under Gas-supplying enthalpy-increasing raising heating performance and condition of ultralow temperature by reducing by two demands of compressor exhaust temperature with liquid tonifying Qi；But also the low-temperature heating capacity of air-conditioning system and the operational reliability of ultralow-temperature operation conditions have been taken into account, widen the application condition range using the air-conditioning system of screw compressor.
Preferably, control at least to be switched on or switched off all the way in two-way tonifying Qi branch road using the control valve system, to reach raising system heating capacity and COP；Or reduce purpose and the effect of compressor exhaust temperature.
Preferably, when the control valve system includes the first tonifying Qi branch road control valve 1 and the second tonifying Qi branch road control valve 2, the first tonifying Qi branch road control valve 1 is opened under the conditions of worst cold case, close the second gas supply control valve 2, by the specific control operation method, purpose and the effect of system heating capacity and COP are improved under this working condition to reach.
Preferably, when the control valve system includes the first tonifying Qi branch road control valve 1 and the second tonifying Qi branch road control valve 2, the second tonifying Qi branch road control valve 2 is opened under the conditions of ultralow-temperature operation conditions, close the first gas supply control valve 1, by the specific control operation method, decline purpose and the effect of low compressor exhaust temperature in this working condition to reach.
Preferably, when the control valve system includes the first tonifying Qi branch road control valve 1 and the second tonifying Qi branch road control valve 2, the first tonifying Qi branch road control valve 1 and the second tonifying Qi branch road control valve 2 are simultaneously closed off.By the specific control operation method, to realize not tonifying Qi, purpose and the effect of conventional single stage compression operation are realized.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc. should be included within the scope of the present invention.The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, on the premise of the technology of the present invention principle is not departed from; some improvement and modification can also be made, these are improved and modification also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of a kind of air-conditioning system, more particularly to heat pump type air conditioning system, including screw compressor, condenser, evaporator, economizer, throttling arrangement and pipe-line control valve, it is characterised in that：The tonifying Qi outlet of the economizer is divided at least two-way tonifying Qi branch road, i.e. the first tonifying Qi branch road and the second tonifying Qi branch road；The first tonifying Qi branch road is connected to the first gas supplementing opening of the compressor, and the second tonifying Qi branch road is connected to the second gas supplementing opening of compressor；Superfeed pressure of the superfeed pressure of second gas supplementing opening more than the first gas supplementing opening；The gas supplementing opening is at least two pairs, and logarithm is identical with tonifying Qi circuitry number；The system also includes the control system for controlling valve to switch on and off in control two-way tonifying Qi branch road.
2. air-conditioning system according to claim 1, it is characterised in that：The air-conditioning system throttling series includes but is not limited to one-level throttling or two-step throttle.
3. air-conditioning system according to claim 1, it is characterised in that：The economizer includes but is not limited to plate type heat exchanger or flash vessel.
4. air-conditioning system according to claim 1, it is characterised in that：The pipe-line control valve includes but is not limited to the first gas supply control valve being arranged on the first tonifying Qi branch road and the second gas supply control valve being arranged on the second tonifying Qi branch road；The tonifying Qi branch road every is at least provided with a control valve；The control valve includes but is not limited to magnetic valve.
5. air-conditioning system according to claim 1, it is characterised in that：The compressor is screw compressor.
6. the air-conditioning system according to claim 1-5 any one, it is characterised in that：First gas supplementing opening includes gas supplementing opening（1）And gas supplementing opening（3）Two gas supplementing openings；Second gas supplementing opening includes gas supplementing opening（2）And gas supplementing opening（4）Two gas supplementing openings；And the gas supplementing opening（1）With the gas supplementing opening（3）Superfeed pressure it is identical, the gas supplementing opening（2）And gas supplementing opening（4）Superfeed pressure it is identical.
7. the air-conditioning system according to claim 1-6 any one, it is characterised in that：Second gas supplementing opening is arranged at the first gas supplementing opening higher pressure, i.e., the exhaust end for being located closer to screw compressor of position first tonifying Qi of described second gas supplementing opening.
8. the air-conditioning system according to claim 1-7 any one, it is characterised in that：The exhaust of the economizer as compressor tonifying Qi, and exhaust end is divided at least two tonifying Qi branch roads, i.e. the first tonifying Qi branch road and the second tonifying Qi branch road two-way tonifying Qi branch road；The first tonifying Qi branch road is connected to the gas supplementing opening of screw compressor（1）And gas supplementing opening（3）, the second tonifying Qi branch road is connected to the gas supplementing opening of screw compressor（2）And gas supplementing opening（4）.
9. the air-conditioning system according to claim 1-8 any one, it is characterised in that：The air-conditioning system can carry out automatic or nonautomatic control and regulation for different working conditions by controlling being switched on or switched off for tonifying Qi branch road control valve, the first tonifying Qi branch road control valve is including but not limited to opened under the conditions of normal and worst cold case, the second tonifying Qi branch road control valve is closed；The second tonifying Qi branch road control valve is opened under the working condition of more low temperature, the first tonifying Qi branch road control valve is closed；The tonifying Qi of the second tonifying Qi branch road is band liquid tonifying Qi.
10. the air-conditioning system according to claim 1-9 any one, it is characterised in that：The air-conditioning system is included but is not limited to, one-level throttling Gas-supplying enthalpy-increasing system or multi-level throttle Gas-supplying enthalpy-increasing system with delivery temperature as restrictive condition；One-level throttling Gas-supplying enthalpy-increasing system or multi-level throttle Gas-supplying enthalpy-increasing system with evaporating pressure as qualifications；One-level throttling Gas-supplying enthalpy-increasing system or multi-level throttle Gas-supplying enthalpy-increasing system with evaporating pressure and pressure at expulsion as qualifications.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510954468 | 2015-12-18 | ||
| CN2015109544689 | 2015-12-18 |
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| CN106895595A true CN106895595A (en) | 2017-06-27 |
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| CN201610037117.6A Pending CN106895595A (en) | 2015-12-18 | 2016-01-21 | A kind of two grades of air-conditioning system with enthalpy increased through vapor injection and control method thereof |
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| CN108286512A (en) * | 2018-04-18 | 2018-07-17 | 格力电器（芜湖）有限公司 | Humidity control system and its double-stage compressor making-up air device and control method |
| CN109931720A (en) * | 2017-12-15 | 2019-06-25 | 三菱电机(广州)压缩机有限公司 | A kind of heat pump system |
| CN110925198A (en) * | 2019-11-01 | 2020-03-27 | 山东佳利略能源科技有限公司 | Multistage air supply screw compressor with economizer loop |
| CN112710098A (en) * | 2021-01-17 | 2021-04-27 | 北京工业大学 | Air supplementing device and method for single-screw refrigeration compressor coupled with composite slide valve under partial load |
| CN114526539A (en) * | 2020-11-23 | 2022-05-24 | 广东美的制冷设备有限公司 | Air supply control method, air conditioner and computer readable storage medium |
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| CN114526539A (en) * | 2020-11-23 | 2022-05-24 | 广东美的制冷设备有限公司 | Air supply control method, air conditioner and computer readable storage medium |
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