CN103574966B - Heat pump type air corditioning system and Defrost method thereof - Google Patents

Heat pump type air corditioning system and Defrost method thereof Download PDF

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Publication number
CN103574966B
CN103574966B CN201210269782.XA CN201210269782A CN103574966B CN 103574966 B CN103574966 B CN 103574966B CN 201210269782 A CN201210269782 A CN 201210269782A CN 103574966 B CN103574966 B CN 103574966B
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compressor
type air
pump type
heat exchanger
refrigerant
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CN103574966A (en
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孟琪林
段亮
陈绍林
熊军
梁志滔
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Abstract

The invention provides a kind of heat pump type air corditioning system, comprise: indoor heat exchanger, outdoor heat exchanger, compressor, cross valve, storage heater and accumulation of heat loop, wherein, cross valve is connected with exhaust end, indoor heat exchanger and outdoor heat exchanger with the suction end of compressor respectively; Cross valve is connected with the suction end of compressor by the first pipeline; Storage heater is wrapped on compressor outer wall; Loop is in series with storage heater in accumulation of heat, and accumulation of heat loop is in parallel with the first pipeline.Above-mentioned heat pump type air corditioning system, take full advantage of the heat in outdoor heat exchanger, improve suction superheat and the enthalpy of compressor air suction end refrigerant significantly, thus improve the temperature of compressor air-discharging end refrigerant significantly, and then improve the defrosting efficiency of heat pump type air corditioning system.Present invention also offers a kind of Defrost method of heat pump type air corditioning system.

Description

Heat pump type air corditioning system and Defrost method thereof
Technical field
The present invention relates to air conditioner technical field, more particularly, relate to a kind of heat pump type air corditioning system and Defrost method thereof.
Background technology
In heat pump type air corditioning system heating operations, when ambient temperature is lower, easy frosting on outdoor heat exchanger, the heat transfer effect of outdoor heat exchanger is reduced, thus affect the carrying out of heat pump type air corditioning system heating operations, when frosting acquires a certain degree, make indoor heating effect lower, indoor heat exchanger even can be made to heat, namely cannot blow out and heat wind higher than indoor temperature.At this time just need the frosting removed on outdoor heat exchanger, to recover its heat transfer effect, guarantee the heating performance of heat pump type air corditioning system.The patent No. be CN201180001679.0 patent discloses a kind of refrigerating circulatory device, in this refrigerating circulatory device, Defrost mode is mainly and arranges storage heater and accumulation of heat loop on compressor housing, wherein storage heater collect and process machine runs the heat that produces and absorbs this heat for refrigerant, one end, accumulation of heat loop is connected with the pipeline between indoor heat exchanger and expansion valve, and the other end in accumulation of heat loop is connected with the suction end of compressor.Refrigerant part indoor heat exchanger being flowed into expansion valve imports in storage heater, refrigerant flows through storage heater and absorbs the heat that produces of compressor operating that storage heater assembles, then compressor is flowed into, suction superheat and the enthalpy of compressor air suction end refrigerant is improved with this, thus improve the temperature of compressor air-discharging end refrigerant, and then improve the temperature of whole system refrigerant, namely improve the temperature of refrigerant in outdoor heat exchanger, realize the defrosting to outdoor heat exchanger.
In above-mentioned Defrost mode, because the refrigerant flowing into expansion valve from indoor heat exchanger is gas-liquid mixed refrigerant, the refrigerant temperature of this state is lower, and enthalpy is lower.This refrigerant endothermic gasification in storage heater becomes gaseous coolant, namely the heat part in storage heater is used for the gasification of this refrigerant, a part is for raising suction superheat and the enthalpy of this refrigerant, then cause this refrigerant after storage heater heating, it is less that the suction superheat of this refrigerant and enthalpy raise, owing to flowing into the refrigerant of compressor air suction end from storage heater and mutually mixing from the refrigerant of outdoor heat exchanger inflow compressor air suction end, what the suction superheat of compressor air suction end refrigerant and enthalpy were raised is less, cause defrosting time needed for above-mentioned Defrost mode longer, make defrosting efficiency lower.
In addition, in above-mentioned Defrost mode, refrigerant part indoor heat exchanger being flowed into expansion valve imports in storage heater, because storage heater is arranged on compressor, distance and the compressor of compressor distance expansion valve are all far away apart from the distance of indoor heat exchanger, the pipeline that the refrigerant part causing indoor heat exchanger to flow into expansion valve imports needed for storage heater is longer, makes whole air-conditioning system pipeline more complicated, is also that the cost of air-conditioning system is higher simultaneously.
In sum, how improving the defrosting efficiency of heat pump type air corditioning system, is current those skilled in the art's problem demanding prompt solution.
Summary of the invention
The object of this invention is to provide a kind of heat pump type air corditioning system, to improve the defrosting efficiency of heat pump type air corditioning system.Another object of the present invention is to provide a kind of Defrost method of heat pump type air corditioning system.
To achieve these goals, the invention provides following technical scheme:
A kind of heat pump type air corditioning system, comprise: indoor heat exchanger, outdoor heat exchanger, compressor, the cross valve be connected with exhaust end, described indoor heat exchanger and described outdoor heat exchanger with the suction end of described compressor, described cross valve is connected with the suction end of described compressor by the first pipeline; Be wrapped in the storage heater on described compressor outer wall; Be in series with the accumulation of heat loop of described storage heater, described accumulation of heat loop is in parallel with described first pipeline; Be in series with described storage heater, and to the heating circuit that described storage heater heats, the two ends of described heating circuit are communicated with the exhaust end of described first pipeline and described compressor respectively.
Preferably, in above-mentioned heat pump type air corditioning system, described first pipeline is connected by the suction end of gas-liquid separator with described compressor with described accumulation of heat loop.
Preferably, in above-mentioned heat pump type air corditioning system, described accumulation of heat loop is in series with the first two-port valve; Described first pipeline is in series with the second two-port valve.
Preferably, in above-mentioned heat pump type air corditioning system, described first pipeline is connected with described cross valve by triple valve with described accumulation of heat loop.
Preferably, above-mentioned heat pump type air corditioning system, also comprise the hot gas bypass circuit that one end is communicated with described outdoor heat exchanger, the other end of described hot gas bypass circuit is connected with the second pipeline of described cross valve with the connection exhaust end of described compressor, or is connected with the 3rd pipeline of described cross valve with the described indoor heat exchanger of connection; Described hot gas bypass circuit is in series with the 3rd two-port valve.
Preferably, in above-mentioned heat pump type air corditioning system, described compressor is compound compressor.
Preferably, in above-mentioned heat pump type air corditioning system, described compressor is double-stage compressor.
Preferably, above-mentioned heat pump type air corditioning system, also comprise for the tonifying Qi loop to tonifying Qi in described compressor, described tonifying Qi loop is connected with the flash vessel of heat pump type air corditioning system, and described tonifying Qi loop is in series with aeration valve.
The heating and defrosting process of heat pump type air corditioning system provided by the invention and principle as follows:
Open accumulation of heat loop, the refrigerant part being about to flow into from cross valve the suction end of compressor imports accumulation of heat loop, this part refrigerant flows in storage heater, storage heater acquires the heat of compressor outer wall, accumulation of heat loop is entered owing to adopting the refrigerant part of the suction end from cross valve inflow compressor, namely this refrigerant have passed through outdoor heat exchanger, heat is absorbed in outdoor heat exchanger, become low-pressure low-temperature gas, low-temp low-pressure gaseous coolant part is imported in storage heater, make the heat in storage heater all for raising temperature and the enthalpy of this low-temp low-pressure gaseous coolant, thus the temperature of this refrigerant and enthalpy raise larger, then this refrigerant flows into the suction end of compressor, converge with the low-temp low-pressure gaseous coolant do not absorbed heat and enter compressor, very sensible heat, improve suction superheat and the enthalpy of compressor air suction end refrigerant significantly, thus effectively improve the temperature of compressor air-discharging end refrigerant, and then effectively improve the temperature of whole system refrigerant, namely improve the temperature of refrigerant in outdoor heat exchanger significantly, and then improve the defrosting efficiency of outdoor heat exchanger.
From above-mentioned defrost process and principle, heat pump type air corditioning system provided by the invention, by setting up the accumulation of heat loop in parallel with the first pipeline, and be series on accumulation of heat loop, and the storage heater be wrapped on compressor outer wall, wherein the first pipeline is the pipeline of the suction end being communicated with cross valve and compressor.Because accumulation of heat loop is in parallel with the first pipeline, the refrigerant flowing into storage heater is made to be the low-temp low-pressure gaseous coolant absorbed heat through outdoor heat exchanger, the low-temp low-pressure gaseous coolant part being about to flow into compressor air suction end imports heat absorption in storage heater, be back to compressor air suction end again, compared with prior art, take full advantage of the heat in outdoor heat exchanger, make the heat in storage heater all for raising temperature and the enthalpy of low-temp low-pressure gaseous coolant, obviously, improve suction superheat and the enthalpy of compressor air suction end refrigerant significantly, thus improve the temperature of compressor air-discharging end refrigerant significantly, and then improve the temperature of whole system refrigerant significantly, namely improve the temperature of refrigerant in outdoor heat exchanger significantly, decrease the defrosting time needed for outdoor heat exchanger, and then improve the defrosting efficiency of heat pump type air corditioning system.
Simultaneously, in above-mentioned heat pump type air corditioning system, the refrigerant part flowing into compressor air suction end from cross valve is imported in storage heater, because storage heater is arranged on compressor, compressor apart from the close together of cross valve, compared with the refrigerant part flowing into expansion valve from indoor heat exchanger imports in storage heater by prior art, obviously, required pipeline is shorter, simplifies the pipeline of this heat pump type air corditioning system; Also reduce the cost of this heat pump type air corditioning system.
Based on above-mentioned heat pump type air corditioning system, present invention also offers a kind of Defrost method for this heat pump type air corditioning system, the Defrost method of heat pump type air corditioning system comprises step:
A: when meeting default defrosting condition, controls cross valve and switches to heating mode;
B: the refrigerant part flowing into the suction end of compressor from described cross valve is imported in the storage heater be wrapped on described compressor outer wall;
C: the suction end refrigerant absorbing heat in described storage heater being imported described compressor;
D: the refrigerant after described compressor compresses is imported outdoor heat exchanger through described cross valve and indoor heat exchanger.
Preferably, in the Defrost method of above-mentioned heat pump type air corditioning system, also step is comprised: the refrigerant part of being discharged by described compressor imports heat release in described storage heater, then the refrigerant after heat release is imported the suction end of described compressor between described steps A and described step C.
Preferably, in the Defrost method of above-mentioned heat pump type air corditioning system, after described steps A, also comprise step: the refrigerant part exhaust end from described compressor being flowed into described indoor heat exchanger imports described outdoor heat exchanger.
Preferably, in the Defrost method of above-mentioned heat pump type air corditioning system, described default defrosting condition be specially outdoor environment temperature lower than or 5 DEG C and higher than or equal-20 DEG C.
Preferably, in the Defrost method of above-mentioned heat pump type air corditioning system, also comprise before described steps A steps A ':
Outdoor environment temperature lower than-20 DEG C or coolant quantity lower than preset value time, control described cross valve and switch to refrigeration mode;
Control outer blower fan to stop operating, and the refrigerant part importing flowing into the suction end of described compressor from described indoor heat exchanger is wrapped in the storage heater on described compressor outer wall;
The refrigerant absorbing heat in described storage heater is imported the suction end of described compressor;
Refrigerant after described compressor compresses is imported described outdoor heat exchanger through described cross valve.
Because the Defrost method of heat pump type air corditioning system provided by the invention provides based on above-mentioned heat pump type air corditioning system, so the Defrost method of heat pump type air corditioning system provided by the invention has the technique effect corresponding to above-mentioned heat pump type air corditioning system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the heat pump type air corditioning system that Fig. 1 provides for the embodiment of the present invention;
The another kind of structural representation of the heat pump type air corditioning system that Fig. 2 provides for the embodiment of the present invention;
Heating mode defrosting schematic diagram in the Defrost method of the heat pump type air corditioning system that Fig. 3 provides for the embodiment of the present invention;
Refrigeration mode defrosting schematic diagram in the Defrost method of the heat pump type air corditioning system that Fig. 4 provides for the embodiment of the present invention.
In upper Fig. 1-4:
Indoor heat exchanger 1, expansion valve 2, outdoor heat exchanger 3, flash vessel 4, compressor 5, cross valve 6, storage heater 7, first pipeline 8, second two-port valve 9, first two-port valve 10, hot gas bypass circuit 11, the 3rd two-port valve 12, aeration valve 13, tonifying Qi loop 14, second pipeline 15, heating circuit 16, the 3rd pipeline 17, triple valve 18, gas-liquid separator 19.
Detailed description of the invention
Embodiments provide a kind of heat pump type air corditioning system, take full advantage of the heat in outdoor heat exchanger, improve suction superheat and the enthalpy of compressor air suction end refrigerant significantly, decrease the defrosting time needed for outdoor heat exchanger, and then improve the defrosting efficiency of heat pump type air corditioning system.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The heat pump type air corditioning system that the embodiment of the present invention provides, comprise: indoor heat exchanger 1, outdoor heat exchanger 3, compressor 5, cross valve 6, storage heater 7 and accumulation of heat loop, wherein, cross valve 6 is connected with exhaust end, indoor heat exchanger 1 and outdoor heat exchanger 3 with the suction end end of compressor 5 respectively, and cross valve 6 is connected with the suction end of compressor 5 by the first pipeline 8; Storage heater 7 is wrapped on compressor 5 outer wall; Accumulation of heat loop is in series with storage heater 7, and accumulation of heat loop is in parallel with the first pipeline 8, as depicted in figs. 1 and 2.Storage heater 7 for absorbing the heat of compressor 5 outer wall, and heats the refrigerant flowed into from accumulation of heat loop.Expansion valve 2 is provided with between outdoor heat exchanger 3 and indoor heat exchanger 1.
The heating and defrosting process of the heat pump type air corditioning system that the embodiment of the present invention provides and principle as follows:
Open accumulation of heat loop, the refrigerant part being about to flow into from cross valve 6 suction end of compressor 5 imports accumulation of heat loop, this part refrigerant flows in storage heater 7, storage heater 7 acquires the heat of compressor 5 outer wall, the refrigerant part flowing into the suction end of compressor 5 from cross valve 6 due to employing enters accumulation of heat loop, namely this refrigerant have passed through outdoor heat exchanger 3, in outdoor heat exchanger 3, absorb heat become low-pressure low-temperature gas, low-temp low-pressure gaseous coolant part is imported in storage heater 7, make the heat in storage heater 7 all for raising temperature and the enthalpy of this low-temp low-pressure gaseous coolant, thus the temperature of this refrigerant and enthalpy raise larger, then this refrigerant flows into the suction end of compressor 5, converge with the low-temp low-pressure gaseous coolant do not absorbed heat and enter compressor 5, very sensible heat, improve suction superheat and the enthalpy of compressor 5 suction end refrigerant significantly, thus effectively improve the temperature of compressor 5 exhaust end refrigerant, and then effectively improve the temperature of whole system refrigerant, namely improve the temperature of refrigerant in outdoor heat exchanger 3 significantly, and then improve the defrosting efficiency of outdoor heat exchanger 3.
From above-mentioned defrost process and principle, the heat pump type air corditioning system that the embodiment of the present invention provides, by setting up the accumulation of heat loop in parallel with the first pipeline 8, and be series on accumulation of heat loop, and the storage heater 7 be wrapped on compressor 5 outer wall, wherein the first pipeline 8 is the pipeline of the suction end being communicated with cross valve 6 and compressor 5.Because accumulation of heat loop is in parallel with the first pipeline 8, the refrigerant flowing into storage heater 7 is made to be the low-temp low-pressure gaseous coolant absorbed heat through outdoor heat exchanger 3, the low-temp low-pressure gaseous coolant part being about to flow into compressor 5 suction end imports heat absorption in storage heater 7, be back to compressor 5 suction end again, compared with prior art, take full advantage of the heat in outdoor heat exchanger 3, make the heat in storage heater 7 all for raising temperature and the enthalpy of low-temp low-pressure gaseous coolant, obviously, improve suction superheat and the enthalpy of compressor 5 suction end refrigerant significantly, thus improve the temperature of compressor 5 exhaust end refrigerant significantly, and then improve the temperature of whole system refrigerant significantly, namely improve the temperature of refrigerant in outdoor heat exchanger 3 significantly, decrease the defrosting time needed for outdoor heat exchanger 3, and then improve the defrosting efficiency of heat pump type air corditioning system.
Simultaneously, in the heat pump type air corditioning system that above-described embodiment provides, the refrigerant part flowing into compressor 5 suction end from cross valve 6 is imported in storage heater 7, because storage heater 7 is arranged on compressor 5, compressor 5 apart from the close together of cross valve 6, compared with the refrigerant part flowing into expansion valve from indoor heat exchanger imports in storage heater by prior art, obviously, required pipeline is shorter, simplifies the pipeline of this heat pump type air corditioning system; Also reduce the cost of this heat pump type air corditioning system.
In order to avoid liquid hit phenomenon appears in compressor 5; in the heat pump type air corditioning system that above-described embodiment provides; first pipeline 8 is connected by the suction end of gas-liquid separator 19 with compressor 5 with accumulation of heat loop, thus avoids liquid refrigerants to flow into compressor 5, realizes the protection to compressor 5.
For the ease of controlling accumulation of heat loop, in the heat pump type air corditioning system that above-described embodiment provides, accumulation of heat loop is in series with the first two-port valve 10; First pipeline 8 is in series with the second two-port valve 9.First two-port valve 10 and the second two-port valve 9 are respectively used to regulate the coolant quantity in accumulation of heat loop and the first pipeline 8, concrete regulated quantity, determine according to the frosting situation of outdoor heat exchanger 3.Certainly, regulate the coolant quantity in accumulation of heat loop and the first pipeline 8, also can adopt other mode, particularly, the first pipeline 8 is connected with cross valve 6 by triple valve 18 with accumulation of heat loop, as shown in Figure 2.Like this, the use amount of valve can be reduced, reduce the parts of this heat pump type air corditioning system, be convenient to the control realizing coolant quantity.
When the temperature of storage heater 7 is lower, the heat importing the refrigerant absorption of storage heater 7 from cross valve 6 can reduce, and causes the temperature of this refrigerant lower, affects defrosting effect.In order to solve the problem, the heat pump type air corditioning system that above-described embodiment provides, also comprises and is in series with storage heater 7, and to the heating circuit 16 that storage heater 7 heats, the two ends of this heating circuit 16 are communicated with the exhaust end of the first pipeline 8 and compressor 5 respectively.The refrigerant of discharging due to compressor 5 is pressure high temperature hot gas, can heat storage heater 7, improve the temperature of storage heater 7, and then increase the heat flowing into the refrigerant in storage heater 7 from accumulation of heat loop and absorb, avoid the temperature occurring importing from storage heater 7 refrigerant of the suction end of compressor 5 lower, and then to the harmful effect that outdoor heat exchanger 3 defrosts when the temperature reducing storage heater 7 is lower; Meanwhile, the refrigerant after heat storage device 7 flows into the suction end of compressor 5, converges temperature and the enthalpy of the refrigerant of the suction end also improving compressor to a certain extent, further increase defrosting efficiency with the colder refrigerant flowing into compressor 5 from the first pipeline 7.
In the heat pump type air corditioning system that above-described embodiment provides, because the refrigerant importing heating circuit 16 is high temperature and high pressure gas, this high temperature and high pressure gas will converge with low temperature low pressure gas, in order to reduce potential safety hazard, prioritizing selection heating circuit 16 is in series with the first bypass capillary, carry out reducing pressure by regulating flow by the first bypass capillary to high temperature and high pressure gas, before and after reducing pressure by regulating flow, the enthalpy of refrigerant is constant.
Preferably, the heat pump type air corditioning system that above-described embodiment provides, also comprise the hot gas bypass circuit 11 of one end communication chamber external heat exchanger 3, the other end of this hot gas bypass circuit 11 is connected with the pipeline between the exhaust end of compressor 5 and indoor heat exchanger 1, the refrigerant part adopting compressor 5 to discharge imports outdoor heat exchanger 3, directly outdoor heat exchanger 3 is heated, and improve the temperature of refrigerant in outdoor heat exchanger 3, further increase the defrosting effect of outdoor heat exchanger 3.The connection bit of hot gas bypass circuit 11 wherein one end is equipped with two kinds, and hot gas bypass circuit 11 can be connected with the second pipeline 15 of cross valve 6 with the connection exhaust end of compressor 5, also can be connected with the 3rd pipeline 17 of cross valve 6 with connection indoor heat exchanger 1.Which kind of connects in concrete employing, and the present invention is that embodiment does not limit particularly to this.For the ease of controlling the coolant quantity in hot gas bypass circuit 11, prioritizing selection hot gas bypass circuit 11 is in series with the 3rd two-port valve 12 and the second bypass capillary.
In order to optimize technique scheme further, in the heat pump type air corditioning system that above-described embodiment provides, compressor 5 is compound compressor, improves the operating efficiency of this heat pump type air corditioning system and improves the service behaviour of heat pump type air corditioning system.Preferably, compressor 5 is double-stage compressor.
When this air-conditioning system is multi-stage compression system, there is the situation of deficency, unfavorable to the defrosting of outdoor heat exchanger 3.In order to avoid above-mentioned situation occurs, the heat pump type air corditioning system that above-described embodiment provides, also comprise for the tonifying Qi loop 14 to tonifying Qi in compressor 5, this tonifying Qi loop 14 is connected with the flash vessel 4 of heat pump type air corditioning system.For the ease of controlling the coolant quantity in tonifying Qi loop 14, prioritizing selection is stated on tonifying Qi loop 14 and is in series with aeration valve 13, and particularly, aeration valve 13 is two-port valve.
In the heat pump type air corditioning system that above-described embodiment provides, can according to the concrete needs of reality, accumulation of heat loop, hot gas bypass circuit 11, tonifying Qi loop 14 arrange check valve, and avoid occurring backflow phenomenon, the embodiment of the present invention does not limit particularly to this.
Based on the heat pump type air corditioning system that above-described embodiment provides, the embodiment of the present invention additionally provides a kind of Defrost method for this heat pump type air corditioning system, and the Defrost method of heat pump type air corditioning system comprises step:
SA: when meeting default defrosting condition, controls cross valve 6 and switches to heating mode;
Heat pump type air corditioning system there will be the phenomenon of frosting when heating mode, when this heat pump type air corditioning system is in heating mode, switch to heating mode, because be in heating mode without the need to controlling cross valve 6 again.Default defrosting condition be specially outdoor environment temperature lower than or equal 5 DEG C and higher than or equal-20 DEG C.Certainly, also can be other conditions, such as, in heating process, the coil temperature of outdoor heat exchanger 3 lower than or equal-5 DEG C, or the coil temperature of outdoor heat exchanger 3 is lower than outdoor environment temperature 10 DEG C.Preset defrosting condition to determine according to the specific works state of heat pump type air corditioning system, outdoor environment temperature and indoor environment temperature, the embodiment of the present invention does not limit particularly to this.
SB: the refrigerant part flowing into the suction end of compressor 5 from cross valve 6 is imported in the storage heater 7 be wrapped on compressor 5 outer wall;
The refrigerant part flowing into the suction end of compressor 5 from cross valve 6 due to employing enters accumulation of heat loop, namely this refrigerant have passed through outdoor heat exchanger 3, and the heat in absorption chamber external heat exchanger 3, become low-pressure low-temperature gas, the heat low-temp low-pressure gaseous coolant then taken full advantage of in outdoor heat exchanger 3 fully absorbs heat in storage heater 7, make the heat in storage heater 7 all for raising temperature and the enthalpy of low-temp low-pressure gaseous coolant, i.e. the temperature of this refrigerant and the larger of enthalpy rising.
SC: the suction end refrigerant absorbing heat in storage heater 7 being imported compressor 5;
The refrigerant of heat absorption in storage heater 7 is imported the suction end of compressor 5, converge with the low-temp low-pressure gaseous coolant do not absorbed heat and enter the suction end of compressor 5, obviously, improve suction superheat and the enthalpy of compressor 5 suction end refrigerant significantly.
SD: the refrigerant after being compressed by compressor 5 imports outdoor heat exchanger 3 through cross valve 6 and indoor heat exchanger 1;
Owing to improve suction superheat and the enthalpy of compressor 5 suction end refrigerant significantly, thus effectively improve the temperature of compressor 5 exhaust end refrigerant, and then improve the temperature of whole system refrigerant significantly, namely improve the temperature of refrigerant in outdoor heat exchanger 3 significantly, decrease the defrosting time needed for outdoor heat exchanger 3, and then improve the defrosting efficiency of outdoor heat exchanger 3.
The Defrost method of the heat pump type air corditioning system that the embodiment of the present invention provides, the refrigerant of inflow storage heater 7 is made to be the low-temp low-pressure gaseous coolant absorbed heat through outdoor heat exchanger 3, the low-temp low-pressure gaseous coolant part being about to flow into compressor 5 suction end imports heat absorption in storage heater 7, be back to compressor 5 suction end again, compared with prior art imports in storage heater from the refrigerant part that indoor heat exchanger flows into expansion valve, take full advantage of the heat in outdoor heat exchanger 3, make the heat in storage heater 7 all for raising temperature and the enthalpy of low-temp low-pressure gaseous coolant, obviously, improve suction superheat and the enthalpy of compressor 5 suction end refrigerant significantly, thus improve the temperature of compressor 5 exhaust end refrigerant significantly, and then improve the temperature of whole system refrigerant significantly, namely improve the temperature of refrigerant in outdoor heat exchanger 3 significantly, and then improve the defrosting efficiency of heat pump type air corditioning system.
Preferably, in the Defrost method of the heat pump type air corditioning system that above-described embodiment provides, also comprise step after between step SA and step SC: the refrigerant part of being discharged by described compressor 5 imports heat release in storage heater 7, then the refrigerant after heat release is imported the suction end of compressor 5.The refrigerant of discharging due to compressor 5 is pressure high temperature hot gas, storage heater 7 is heated, improve the temperature of storage heater 7, and then increase the heat flowing into the refrigerant absorption in storage heater 7 from accumulation of heat loop, avoid the temperature occurring importing from storage heater 7 refrigerant of the suction end of compressor 5 lower, and then to the harmful effect that outdoor heat exchanger 3 defrosts when the temperature reducing storage heater 7 is lower; Meanwhile, the refrigerant after heat release flows into the suction end of compressor 5, converges temperature and the enthalpy of the refrigerant of the suction end also improving compressor to a certain extent, further increase defrosting efficiency with the colder refrigerant flowing into compressor 5 from the first pipeline 7.
Preferably, in the Defrost method of the heat pump type air corditioning system that above-described embodiment provides, after step SA, also step is comprised: the refrigerant part that the exhaust end from compressor 5 flows into indoor heat exchanger 1 is imported outdoor heat exchanger 3.The refrigerant part adopting compressor 5 to discharge imports outdoor heat exchanger 3, directly heats outdoor heat exchanger 3, and improves the temperature of refrigerant in outdoor heat exchanger 3, further increase the defrosting efficiency of outdoor heat exchanger 3.
When the compressor of this heat pump type air corditioning system be double-stage compressor or compound compressor time, there is the situation of deficency, unfavorable to the defrosting of outdoor heat exchanger 3.In order to avoid above-mentioned situation occurs, in the Defrost method of the heat pump type air corditioning system that above-described embodiment provides, after step SA, also comprise step: tonifying Qi in compressor 5.
Preferably, in the Defrost method of the heat pump type air corditioning system that above-described embodiment provides, after step SA, also comprise step: outdoor temperature lower than or equal 5 DEG C time, outdoor fan stops operating.Time due to defrosting, have high temperature refrigerant to flow through in outdoor heat exchanger 3 and defrost, now high temperature refrigerant generally can be higher than outdoor environment temperature, in order to ensure that high temperature refrigerant defrosts, needing outdoor fan to stop operating, avoiding high temperature refrigerant to lower the temperature.
In order to optimize technique scheme further, the Defrost method of the heat pump type air corditioning system that above-described embodiment provides, also comprises step SA' before step SA:
Outdoor environment temperature lower than-20 DEG C or coolant quantity lower than preset value time, control cross valve 6 and switch to refrigeration mode;
Control outer blower fan to stop operating, and the refrigerant part importing flowing into the suction end of compressor 5 from indoor heat exchanger 1 is wrapped in heat absorption in the storage heater 7 on compressor 5 outer wall;
Refrigerant in storage heater 7 is imported the suction end of compressor 5;
Refrigerant after being compressed by compressor 5 imports outdoor heat exchanger 3 through cross valve 6.
(cause defrosting at need) when outdoor environment temperature is lower or coolant quantity is not enough, first adopt cross valve 6 reverse cycle defrost, namely heat pump type air corditioning system is converted to refrigeration mode, defrosts in cooling mode, i.e. refrigeration mode defrosting, as shown in Figure 4.When outdoor environment temperature is greater than or equal to-20 DEG C, again controls cross valve 6 and commutate, even if this heat pump type air corditioning system is converted to heating mode, continue defrost and carry out heat supply.Like this, the defrosting speed of heat pump type air corditioning system can be accelerated, complete defrosting as early as possible, further increase the defrosting efficiency of this heat pump type air corditioning system.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (12)

1. a heat pump type air corditioning system, comprise: indoor heat exchanger (1), outdoor heat exchanger (3), compressor (5), the cross valve (6) be connected with exhaust end, described indoor heat exchanger (1) and described outdoor heat exchanger (3) with the suction end of described compressor (5), described cross valve (6) is connected by the suction end of the first pipeline (8) with described compressor (5); It is characterized in that, also comprise:
Be wrapped in the storage heater (7) on described compressor (5) outer wall;
Be in series with the accumulation of heat loop of described storage heater (7), described accumulation of heat loop is in parallel with described first pipeline (8);
Be in series with described storage heater (7), and to the heating circuit (16) that described storage heater (7) heats, the two ends of described heating circuit (16) are communicated with the exhaust end of described first pipeline (8) and described compressor (5) respectively.
2. heat pump type air corditioning system according to claim 1, is characterized in that, described first pipeline (8) is connected by the suction end of gas-liquid separator (19) with described compressor (5) with described accumulation of heat loop.
3. heat pump type air corditioning system according to claim 1, is characterized in that, described accumulation of heat loop is in series with the first two-port valve (10); Described first pipeline (8) is in series with the second two-port valve (9).
4. heat pump type air corditioning system according to claim 1, is characterized in that, described first pipeline (8) is connected with described cross valve (6) by triple valve (18) with described accumulation of heat loop.
5. heat pump type air corditioning system according to claim 1, it is characterized in that, also comprise the hot gas bypass circuit (11) that one end is communicated with described outdoor heat exchanger (3), the other end of described hot gas bypass circuit (11) is connected with second pipeline (15) of described cross valve (6) with the exhaust end being communicated with described compressor (5), or is connected with the 3rd pipeline (17) of described cross valve (6) with the described indoor heat exchanger of connection (1); Described hot gas bypass circuit (11) is in series with the 3rd two-port valve (12).
6. according to the heat pump type air corditioning system in claim 1-5 described in any one, it is characterized in that, described compressor (5) is compound compressor.
7. according to the heat pump type air corditioning system in claim 1-5 described in any one, it is characterized in that, described compressor (5) is double-stage compressor.
8. heat pump type air corditioning system according to claim 6, it is characterized in that, also comprise for the tonifying Qi loop (14) to described compressor (5) interior tonifying Qi, described tonifying Qi loop (14) is connected with the flash vessel (4) of heat pump type air corditioning system, and described tonifying Qi loop (14) is in series with aeration valve (13).
9. a Defrost method for heat pump type air corditioning system, is characterized in that, comprises step:
A: when meeting default defrosting condition, controls cross valve (6) and switches to heating mode;
B: the refrigerant part flowing into the suction end of compressor (5) from described cross valve (6) is imported in the storage heater (7) be wrapped on described compressor (5) outer wall;
C: the suction end refrigerant absorbing described storage heater (7) interior heat being imported described compressor (5);
D: the refrigerant after being compressed by described compressor (5) imports outdoor heat exchanger (3) through described cross valve (6) and indoor heat exchanger (1);
Also step is comprised: the refrigerant part that described compressor (5) is discharged is imported heat release in described storage heater (7), then the refrigerant after heat release is imported the suction end of described compressor (5) between described steps A and described step C.
10. the Defrost method of heat pump type air corditioning system according to claim 9, it is characterized in that, after described steps A, also comprise step: the refrigerant part exhaust end from described compressor (5) being flowed into described indoor heat exchanger (1) imports described outdoor heat exchanger (3).
The Defrost method of 11. heat pump type air corditioning systems according to claim 10, is characterized in that, described default defrosting condition be specially outdoor environment temperature lower than or equal 5 DEG C and higher than or equal-20 DEG C.
The Defrost method of 12. heat pump type air corditioning systems according to claim 11, is characterized in that, also comprise before described steps A steps A ':
Outdoor environment temperature lower than-20 DEG C or coolant quantity lower than preset value time, control described cross valve (6) and switch to refrigeration mode;
Control outer blower fan to stop operating, and the refrigerant part importing flowing into the suction end of described compressor (5) from described indoor heat exchanger (1) is wrapped in the storage heater (7) on described compressor (5) outer wall;
The refrigerant absorbing described storage heater (7) interior heat is imported the suction end of described compressor (5);
Refrigerant after being compressed by described compressor (5) imports described outdoor heat exchanger (3) through described cross valve (6).
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