CN103574966A - Heat-pump air conditioning system and defrosting method for same - Google Patents
Heat-pump air conditioning system and defrosting method for same Download PDFInfo
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- CN103574966A CN103574966A CN201210269782.XA CN201210269782A CN103574966A CN 103574966 A CN103574966 A CN 103574966A CN 201210269782 A CN201210269782 A CN 201210269782A CN 103574966 A CN103574966 A CN 103574966A
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Abstract
The invention provides a heat-pump air conditioning system which comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor, a four-way valve, a heat accumulator and a heat accumulation circuit. The four-way valve is respectively communicated with an air suction end and an exhaust end of the compressor, the indoor heat exchanger and the outdoor heat exchanger and is connected with the air suction end of the compressor by a first pipeline; the heat accumulator wraps the outer wall of the compressor; the heat accumulator is serially connected onto the heat accumulation circuit, and the heat accumulation circuit is connected with the first pipeline in parallel. The heat-pump air conditioning system has the advantages that heat in the outdoor heat exchanger can be sufficiently utilized, and an air suction superheat degree and an enthalpy value of refrigerants at the air suction end of the compressor can be greatly increased, so that the temperature of refrigerants at the exhaust end of the compressor can be greatly increased, and the defrosting efficiency of the heat-pump air conditioning system can be improved. The invention further provides a defrosting method for the heat-pump air conditioning system.
Description
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
At heat pump type air corditioning system, heat in process, when ambient temperature is lower, easily frosting on outdoor heat exchanger, the heat transfer effect of outdoor heat exchanger is reduced, thereby affect the carrying out that heat pump type air corditioning system heats process, when frosting acquires a certain degree, make indoor heating effect lower, even can make indoor heat exchanger heat, cannot blow out the wind that heats higher than indoor temperature.At this time just need to remove the frosting on outdoor heat exchanger, to recover its heat transfer effect, guarantee the heating performance of heat pump type air corditioning system.The patent No. is that the patent of CN201180001679.0 discloses a kind of refrigerating circulatory device, in this refrigerating circulatory device, Defrost mode is mainly storage heater and accumulation of heat loop is set on compressor housing, the heat that wherein storage heater collection compressor operating produces also 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.The refrigerant that indoor heat exchanger is flowed into expansion valve partly imports in storage heater, flow through storage heater absorb the heat that compressor operating that storage heater assembles produces of refrigerant, then flow into compressor, with this, improve suction superheat and the enthalpy of compressor air suction end refrigerant, thereby improve the temperature of compressor air-discharging end refrigerant, and then improve the temperature of whole system refrigerant, and improve the temperature of refrigerant in outdoor heat exchanger, realize the defrosting to outdoor heat exchanger.
In above-mentioned Defrost mode, owing to flowing into the refrigerant of expansion valve from indoor heat exchanger, be 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, be that a heat part in storage heater is for this refrigerant gasification, a part is for suction superheat and the enthalpy of this refrigerant that raises, 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 that outdoor heat exchanger flows into compressor air suction end, what make that the suction superheat of compressor air suction end refrigerant and enthalpy raise is less, cause the required defrosting time of above-mentioned Defrost mode longer, make defrosting efficiency lower.
In addition, in above-mentioned Defrost mode, the refrigerant that indoor heat exchanger is flowed into expansion valve partly imports in storage heater, because storage heater is arranged on compressor, compressor is all far away apart from the distance of indoor heat exchanger apart from distance and the compressor of expansion valve, it is longer that the refrigerant that causes indoor heat exchanger to flow into expansion valve partly imports the required pipeline of storage heater, 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, with the cross valve that suction end and exhaust end, described indoor heat exchanger and the described outdoor heat exchanger of described compressor are connected, 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 the first pipeline.
Preferably, in above-mentioned heat pump type air corditioning system, described the first pipeline and described accumulation of heat loop are connected with the suction end of described compressor by gas-liquid separator.
Preferably, in above-mentioned heat pump type air corditioning system, described accumulation of heat is in series with the first two-port valve on loop; On described the first pipeline, be in series with the second two-port valve.
Preferably, in above-mentioned heat pump type air corditioning system, described the first pipeline and described accumulation of heat loop are connected with described cross valve by triple valve.
Preferably, above-mentioned heat pump type air corditioning system, also comprises and is in series with described storage heater, and the heating circuit to described storage heater heating, and the two ends of described heating circuit are communicated with respectively the exhaust end of described the first pipeline and described compressor.
Preferably, above-mentioned heat pump type air corditioning system, also comprise that one end is communicated with the hot gas bypass circuit of described outdoor heat exchanger, the other end of described hot gas bypass circuit is connected with the connection exhaust end of described compressor and the second pipeline of described cross valve, or is connected with the 3rd pipeline that is communicated with described indoor heat exchanger and described cross valve; In described hot gas bypass circuit, be in series with the 3rd two-port valve.
Preferably, in above-mentioned heat pump type air corditioning system, the compressor of heat pump type air corditioning system is double-stage compressor or compound compressor.
Preferably, above-mentioned heat pump type air corditioning system, also comprises the tonifying Qi loop for tonifying Qi in described compressor, and described tonifying Qi loop is connected with the flash vessel of heat-pump-type defrost system, and is in series with aeration valve on described tonifying Qi loop.
Heating and defrosting process and the principle of heat pump type air corditioning system provided by the invention are as follows:
Open accumulation of heat loop, the refrigerant that is about to flow into from cross valve the suction end of compressor partly imports accumulation of heat loop, this part refrigerant flows in storage heater, storage heater has gathered the heat of compressor outer wall, the refrigerant that flows into the suction end of compressor from cross valve due to employing partly enters accumulation of heat loop, this refrigerant has passed through outdoor heat exchanger, in outdoor heat exchanger, absorbed heat, become low-pressure low-temperature gas, low-temp low-pressure gaseous coolant is partly imported in storage heater, make heat in storage heater all for temperature and the enthalpy of this low-temp low-pressure gaseous coolant that raises, it is larger that thereby the temperature of this refrigerant and enthalpy raise, then this refrigerant flows into the suction end of compressor, converge and enter compressor with the low-temp low-pressure gaseous coolant of not heat absorption, sensible heat very, suction superheat and the enthalpy of compressor air suction end refrigerant have been improved significantly, thereby effectively improved the temperature of compressor air-discharging end refrigerant, and then effectively improved the temperature of whole system refrigerant, improved significantly the temperature of refrigerant in outdoor heat exchanger, and then improved 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 be wrapped in the storage heater on compressor outer wall, wherein the first pipeline is for being communicated with the pipeline of the suction end of cross valve and compressor.Because accumulation of heat loop is in parallel with the first pipeline, make to flow into the low-temp low-pressure gaseous coolant that the refrigerant of storage heater is the heat absorption of process outdoor heat exchanger, the low-temp low-pressure gaseous coolant that soon should flow into compressor air suction end partly imports heat absorption in storage heater, be back to again compressor air suction end, compared with prior art, take full advantage of the heat in outdoor heat exchanger, make heat in storage heater all for temperature and the enthalpy of the low-temp low-pressure gaseous coolant that raises, obviously, suction superheat and the enthalpy of compressor air suction end refrigerant have been improved significantly, thereby improved significantly the temperature of compressor air-discharging end refrigerant, and then improved significantly the temperature of whole system refrigerant, improved significantly the temperature of refrigerant in outdoor heat exchanger, reduced the required defrosting time of outdoor heat exchanger, and then improved the defrosting efficiency of heat pump type air corditioning system.
Simultaneously, in above-mentioned heat pump type air corditioning system, the refrigerant that flows into compressor air suction end from cross valve is partly imported in storage heater, because storage heater is arranged on compressor, compressor, apart from the close together of cross valve, partly imports the refrigerant that flows into expansion valve from indoor heat exchanger in storage heater and compares with prior art, obviously, required pipeline is shorter, has simplified the pipeline of this heat pump type air corditioning system; Also reduced the cost of this heat pump type air corditioning system.
Based on above-mentioned heat pump type air corditioning system, the present invention also 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:
A: while meeting default defrosting condition, control cross valve and switch to heating mode;
B: the refrigerant that flows into the suction end of described compressor from described cross valve is partly imported in the storage heater being wrapped on described compressor outer wall;
C: the suction end that the refrigerant that absorbs heat in described storage heater is imported to described compressor;
D: the refrigerant after described compressor compresses is imported to described outdoor heat exchanger through described cross valve and described indoor heat exchanger.
Preferably, in the Defrost method of above-mentioned heat pump type air corditioning system, between described steps A and described step C, also comprise step: the refrigerant that described compressor is discharged partly imports heat release in described storage heater, then the refrigerant after heat release is imported to the suction end of described compressor.
Preferably, in the Defrost method of above-mentioned heat pump type air corditioning system, after described steps A, also comprise step: the refrigerant that the exhaust end from described compressor is flowed into described indoor heat exchanger partly 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 ℃ and higher than or equal-20 ℃.
Preferably, in the Defrost method of above-mentioned heat pump type air corditioning system, before described steps A, also comprise steps A ':
Outdoor environment temperature, is controlled described cross valve and is switched to refrigeration mode during lower than preset value lower than-20 ℃ or coolant quantity;
Control outer blower fan and stop operating, and the refrigerant that flows into the suction end of described compressor from described indoor heat exchanger is partly imported in the storage heater being wrapped on described compressor outer wall;
The refrigerant that absorbs heat in described storage heater is imported to the suction end of described compressor;
Refrigerant after described compressor compresses is imported to 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 and the corresponding technique effect of 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, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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:
The specific embodiment
The embodiment of the present invention provides a kind of heat pump type air corditioning system, take full advantage of the heat in outdoor heat exchanger, suction superheat and the enthalpy of compressor air suction end refrigerant have been improved significantly, reduce the required defrosting time of outdoor heat exchanger, and then improved the defrosting efficiency of heat pump type air corditioning system.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining 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 suction end end and exhaust end, indoor heat exchanger 1 and the outdoor heat exchanger 3 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 walls; On accumulation of heat loop, be 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 is for absorbing the heat of compressor 5 outer walls, and to the refrigerant heating flowing into from accumulation of heat loop.Between outdoor heat exchanger 3 and indoor heat exchanger 1, be provided with expansion valve 2.
Heating and defrosting process and the principle of the heat pump type air corditioning system that the embodiment of the present invention provides are as follows:
Open accumulation of heat loop, the refrigerant that is about to flow into the suction end of compressor 5 from cross valve 6 partly imports accumulation of heat loop, this part refrigerant flows in storage heater 7, storage heater 7 has gathered the heat of compressor 5 outer walls, owing to adopting the refrigerant that flows into the suction end of compressor 5 from cross valve 6 partly to enter accumulation of heat loop, this refrigerant has passed through outdoor heat exchanger 3, in outdoor heat exchanger 3, absorb heat and become low-pressure low-temperature gas, low-temp low-pressure gaseous coolant is partly imported in storage heater 7, make heat in storage heater 7 all for temperature and the enthalpy of this low-temp low-pressure gaseous coolant that raises, it is larger that thereby the temperature of this refrigerant and enthalpy raise, then this refrigerant flows into the suction end of compressor 5, converge and enter compressor 5 with the low-temp low-pressure gaseous coolant of not heat absorption, sensible heat very, suction superheat and the enthalpy of compressor 5 suction end refrigerants have been improved significantly, thereby effectively improved the temperature of compressor 5 exhaust end refrigerants, and then effectively improved the temperature of whole system refrigerant, improved significantly the temperature of refrigerant in outdoor heat exchanger 3, and then improved 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 be wrapped in the storage heater 7 on compressor 5 outer walls, wherein the first pipeline 8 is for being communicated with the pipeline of the suction end of cross valve 6 and compressor 5.Because accumulation of heat loop is in parallel with the first pipeline 8, make to flow into the low-temp low-pressure gaseous coolant that the refrigerant of storage heater 7 is 3 heat absorptions of process outdoor heat exchanger, the low-temp low-pressure gaseous coolant that soon should flow into compressor 5 suction ends partly imports the interior heat absorption of storage heater 7, be back to again compressor 5 suction ends, compared with prior art, take full advantage of the heat in outdoor heat exchanger 3, make heat in storage heater 7 all for temperature and the enthalpy of the low-temp low-pressure gaseous coolant that raises, obviously, suction superheat and the enthalpy of compressor 5 suction end refrigerants have been improved significantly, thereby improved significantly the temperature of compressor 5 exhaust end refrigerants, and then improved significantly the temperature of whole system refrigerant, improved significantly the temperature of refrigerant in outdoor heat exchanger 3, reduced the required defrosting time of outdoor heat exchanger 3, and then improved 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 that flows into compressor 5 suction ends from cross valve 6 is partly 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, partly imports the refrigerant that flows into expansion valve from indoor heat exchanger in storage heater and compares with prior art, obviously, required pipeline is shorter, has simplified the pipeline of this heat pump type air corditioning system; Also reduced the cost of this heat pump type air corditioning system.
For fear of compressor 5, there is liquid hit phenomenon; in the heat pump type air corditioning system that above-described embodiment provides; the first pipeline 8 and accumulation of heat loop are connected with the suction end of compressor 5 by gas-liquid separator 19, thereby avoid liquid refrigerants to flow into compressor 5, realize the protection to compressor 5.
For the ease of accumulation of heat loop is controlled, in the heat pump type air corditioning system that above-described embodiment provides, on accumulation of heat loop, be in series with the first two-port valve 10; On the first pipeline 8, be in series with the second two-port valve 9.The 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, and concrete regulated quantity, determines 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 and accumulation of heat loop are connected with cross valve 6 by triple valve 18, as shown in Figure 2.Like this, can reduce the use amount of valve, reduce the parts of this heat pump type air corditioning system, be convenient to realize the control of coolant quantity.
When the temperature of storage heater 7 is lower, from cross valve 6, importing the heat that the refrigerant of storage heaters 7 absorbs can reduce, and causes the temperature of this refrigerant lower, affects defrosting effect.In order to address the above problem, the heat pump type air corditioning system that above-described embodiment provides, also comprises and is in series with storage heater 7, and the heating circuit 16 to storage heater 7 heating, and the two ends of this heating circuit 16 are communicated with respectively the exhaust end of the first pipeline 8 and compressor 5.The refrigerant of discharging due to compressor 5 is high pressure-temperature gas, can heat storage heater 7, improve the temperature of storage heater 7, and then increase the heat that the refrigerant in accumulation of heat loop flows into storage heater 7 absorbs, avoided occurring to import the temperature of refrigerant of suction end of compressors 5 from storage heater 7 lower, and then reduced the harmful effect to outdoor heat exchanger 3 defrostings when lower of the temperature of storage heater 7; Meanwhile, the refrigerant of heating after storage heater 7 flows into the suction end of compressor 5, converges temperature and the enthalpy of the refrigerant of the suction end that has also improved to a certain extent compressor with the colder refrigerant that flows into compressors 5 from the first pipeline 7, further improved defrosting efficiency.
In the heat pump type air corditioning system that above-described embodiment provides, owing to importing the refrigerant of heating circuit 16, it is high temperature and high pressure gas, this high temperature and high pressure gas will converge with low-temp low-pressure gas, in order to reduce potential safety hazard, preferential selection is in series with the first bypass capillary on heating circuit 16, by the first bypass capillary, high temperature and high pressure gas is carried out to reducing pressure by regulating flow, 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, the hot gas bypass circuit 11 that also comprises one end communication chamber external heat exchanger 3, the other end of this hot gas bypass circuit 11 is connected with the exhaust end of compressor 5 and the pipeline between indoor heat exchanger 1, the refrigerant that adopts compressor 5 to discharge partly imports outdoor heat exchanger 3, directly outdoor heat exchanger 3 is heated, and improve the temperature of refrigerant in outdoor heat exchanger 3, further improved the defrosting effect of outdoor heat exchanger 3.The hot gas bypass circuit 11 wherein connection bit of one end is equipped with two kinds, and hot gas bypass circuit 11 can be connected with the connection exhaust end of compressor 5 and the second pipeline 15 of cross valve 6, also can be connected with the 3rd pipeline 17 that is communicated with indoor heat exchanger 1 and cross valve 6.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, preferentially select to be in series with in hot gas bypass circuit 11 the 3rd two-port valve 12 and the second bypass capillary.
In order further to optimize technique scheme, in the heat pump type air corditioning system that above-described embodiment provides, the compressor of heat pump type air corditioning system is double-stage compressor or 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.
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.For fear of above-mentioned situation, occur, the heat pump type air corditioning system that above-described embodiment provides, also comprises for the tonifying Qi loop 14 to compressor 5 interior tonifying Qi, this tonifying Qi loop 14 is connected with the flash vessel 4 of heat-pump-type defrost system.For the ease of controlling the coolant quantity in tonifying Qi loop 14, preferential 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 on accumulation of heat loop, hot gas bypass circuit 11, tonifying Qi loop 14, check valve be set according to the concrete needs of reality, avoid occurring backflow phenomenon, the embodiment of the present invention does not limit particularly to this.
The heat pump type air corditioning system providing based on above-described embodiment, the embodiment of the present invention also 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: while meeting default defrosting condition, control cross valve 6 and switch 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 during in heating mode, without controlling cross valve 6, switch to heating mode again, because in heating mode.Default defrosting condition be specially outdoor environment temperature lower than or equal 5 ℃ and higher than or equal-20 ℃.Certainly, also can be other conditions, for example, in heating process, the coil temperature of outdoor heat exchanger 3 lower than or equal-5 ℃, or the coil temperature of outdoor heat exchanger 3 is lower 10 ℃ than outdoor environment temperature.Default defrosting condition is according to the specific works state of heat pump type air corditioning system, outdoor environment temperature and indoor environment temperature decision, and the embodiment of the present invention does not limit particularly to this.
SB: the refrigerant that flows into the suction end of compressor 5 from cross valve 6 is partly imported in the storage heater 7 being wrapped on compressor 5 outer walls;
Owing to adopting the refrigerant that flows into the suction end of compressor 5 from cross valve 6 partly to enter accumulation of heat loop, this refrigerant has passed through outdoor heat exchanger 3, and the heat in absorption chamber external heat exchanger 3, become low-pressure low-temperature gas, take full advantage of the heat low-temp low-pressure gaseous coolant fully heat absorption in storage heater 7 in outdoor heat exchanger 3, make heat in storage heater 7 all for temperature and the enthalpy of the low-temp low-pressure gaseous coolant that raises, what the temperature of this refrigerant and enthalpy raise is larger.
SC: the suction end that the refrigerant that absorbs storage heater 7 interior heats is imported to compressor 5;
The refrigerant of heat absorption in storage heater 7 is imported to the suction end of compressor 5, converge and enter the suction end of compressor 5 with the low-temp low-pressure gaseous coolant of not heat absorption, obviously, improved significantly suction superheat and the enthalpy of compressor 5 suction end refrigerants.
SD: the refrigerant after compressor 5 compressions is imported to outdoor heat exchanger 3 through cross valve 6 and indoor heat exchanger 1;
Owing to having improved significantly suction superheat and the enthalpy of compressor 5 suction end refrigerants, thereby effectively improved the temperature of compressor 5 exhaust end refrigerants, and then improved significantly the temperature of whole system refrigerant, improved significantly the temperature of refrigerant in outdoor heat exchanger 3, reduce the required defrosting time of outdoor heat exchanger 3, and then improved 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, make to flow into the low-temp low-pressure gaseous coolant that the refrigerant of storage heater 7 is 3 heat absorptions of process outdoor heat exchanger, the low-temp low-pressure gaseous coolant that soon should flow into compressor 5 suction ends partly imports the interior heat absorption of storage heater 7, be back to again compressor 5 suction ends, the refrigerant that flows into expansion valve from indoor heat exchanger with prior art partly imports in storage heater and compares, take full advantage of the heat in outdoor heat exchanger 3, make heat in storage heater 7 all for temperature and the enthalpy of the low-temp low-pressure gaseous coolant that raises, obviously, suction superheat and the enthalpy of compressor 5 suction end refrigerants have been improved significantly, thereby improved significantly the temperature of compressor 5 exhaust end refrigerants, and then improved significantly the temperature of whole system refrigerant, improved significantly the temperature of refrigerant in outdoor heat exchanger 3, and then improved 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, after between step SA and step SC, also comprise step: the refrigerant that described compressor 5 is discharged partly imports the interior heat release of storage heater 7, then the refrigerant after heat release is imported to the suction end of compressor 5.The refrigerant of discharging due to compressor 5 is high pressure-temperature gas, storage heater 7 is heated, improve the temperature of storage heater 7, and then increase the heat that the refrigerant in accumulation of heat loop flows into storage heater 7 absorbs, avoided occurring to import the temperature of refrigerant of suction end of compressors 5 from storage heater 7 lower, and then reduced the harmful effect to outdoor heat exchanger 3 defrostings when lower of the temperature of storage heater 7; Meanwhile, refrigerant after heat release flows into the suction end of compressor 5, converges temperature and the enthalpy of the refrigerant of the suction end that has also improved to a certain extent compressor with the colder refrigerant that flows into compressors 5 from the first pipeline 7, has further improved defrosting efficiency.
Preferably, in the Defrost method of the heat pump type air corditioning system that above-described embodiment provides, after step SA, also comprise step: the refrigerant that the exhaust end from compressor 5 is flowed into indoor heat exchanger 1 partly imports outdoor heat exchanger 3.The refrigerant that adopts compressor 5 to discharge partly imports outdoor heat exchanger 3, directly outdoor heat exchanger 3 is heated, and improves the temperature of refrigerant in outdoor heat exchanger 3, has further improved the defrosting efficiency of outdoor heat exchanger 3.
When the compressor of this heat pump type air corditioning system is double-stage compressor or compound compressor, there is the situation of deficency, unfavorable to the defrosting of outdoor heat exchanger 3.For fear of above-mentioned situation, occur, in the Defrost method of the heat pump type air corditioning system that above-described embodiment provides, after step SA, also comprise step: to the interior tonifying Qi of 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 while equaling 5 ℃, outdoor fan stops operating.In the time of due to defrosting, have high temperature refrigerant to flow through and defrost in outdoor heat exchanger 3, now high temperature refrigerant generally can be higher than outdoor environment temperature, in order to guarantee that high temperature refrigerant defrosts, needs outdoor fan to stop operating, and avoids high temperature refrigerant cooling.
In order further to optimize technique scheme, 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, is controlled cross valve 6 and is switched to refrigeration mode during lower than preset value lower than-20 ℃ or coolant quantity;
Control outer blower fan and stop operating, and the refrigerant that flows into the suction end of compressor 5 from indoor heat exchanger 1 is partly imported to the interior heat absorption of storage heater 7 being wrapped on compressor 5 outer walls;
Refrigerant in storage heater 7 is imported to the suction end of compressor 5;
Refrigerant after compressor 5 compressions is imported to outdoor heat exchanger 3 through cross valve 6.
When lower or coolant quantity is not enough at outdoor environment temperature (causing defrosting at need), first adopt cross valve 6 reverse cycle defrosts, heat pump type air corditioning system is converted to refrigeration mode, under refrigeration mode, defrost, i.e. and refrigeration mode defrosting, as shown in Figure 4.When outdoor environment temperature is greater than or equal to-20 ℃, again control cross valve 6 commutations, even if this heat pump type air corditioning system is converted to heating mode, continue defrost and carry out heat supply.Like this, can accelerate the defrosting speed of heat pump type air corditioning system, complete as early as possible defrosting, further improve the defrosting efficiency of this heat pump type air corditioning system.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (13)
1. a heat pump type air corditioning system, comprise: indoor heat exchanger (1), outdoor heat exchanger (3), compressor (5), with the cross valve (6) that suction end and exhaust end, described indoor heat exchanger (1) and the described outdoor heat exchanger (3) of described compressor (5) are connected, described cross valve (6) is connected with the suction end of described compressor (5) by the first pipeline (8); 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 the first pipeline (8).
2. heat pump type air corditioning system according to claim 1, is characterized in that, described the first pipeline (8) and described accumulation of heat loop are connected with the suction end of described compressor (5) by gas-liquid separator (1 9).
3. heat pump type air corditioning system according to claim 1, is characterized in that, is in series with the first two-port valve (10) on described accumulation of heat loop; On described the first pipeline (8), be 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 the first pipeline (8) and described accumulation of heat loop are connected with described cross valve (6) by triple valve (18).
5. heat pump type air corditioning system according to claim 1, it is characterized in that, also comprise and be in series with described storage heater (7), and the heating circuit (16) to described storage heater (7) heating, the two ends of described heating circuit (16) are communicated with respectively the exhaust end of described the first pipeline (8) and described compressor (5).
6. heat pump type air corditioning system according to claim 1, it is characterized in that, also comprise that one end is communicated with the hot gas bypass circuit of described outdoor heat exchanger (3) (11), the other end of described hot gas bypass circuit (11) is connected with the exhaust end of the described compressor of connection (5) and second pipeline (15) of described cross valve (6), or is connected with the 3rd pipeline (17) that is communicated with described indoor heat exchanger (1) and described cross valve (6); In described hot gas bypass circuit (11), be in series with the 3rd two-port valve (12).
7. according to the heat pump type air corditioning system described in any one in claim 1-6, it is characterized in that, the compressor of heat pump type air corditioning system is double-stage compressor or compound compressor.
8. heat pump type air corditioning system according to claim 7, it is characterized in that, also comprise for the tonifying Qi loop (14) to the interior tonifying Qi of described compressor (5), described tonifying Qi loop (14) is connected with the flash vessel (4) of heat-pump-type defrost system, and is in series with aeration valve (13) on described tonifying Qi loop (14).
9. a Defrost method for heat pump type air corditioning system, is characterized in that, comprises step:
A: while meeting default defrosting condition, control cross valve (6) and switch to heating mode;
B: the refrigerant that flows into the suction end of described compressor (5) from described cross valve (6) is partly imported in the storage heater (7) being wrapped on described compressor (5) outer wall;
C: the suction end that the refrigerant that absorbs the interior heat of described storage heater (7) is imported to described compressor (5);
D: the refrigerant after described compressor (5) compression is imported to described outdoor heat exchanger (3) through described cross valve (6) and described indoor heat exchanger (1).
10. the Defrost method of heat pump type air corditioning system according to claim 9, it is characterized in that, between described steps A and described step C, also comprise step: the refrigerant that described compressor (5) is discharged partly imports heat release in described storage heater (7), then the refrigerant after heat release is imported to the suction end of described compressor (5).
11. according to the Defrost method of the heat pump type air corditioning system described in claim 9 or 10, it is characterized in that, after described steps A, also comprise step: the refrigerant that the exhaust end from described compressor (5) is flowed into described indoor heat exchanger (1) partly imports described outdoor heat exchanger (3).
The Defrost method of 12. heat pump type air corditioning systems according to claim 11, is characterized in that, described default defrosting condition be specially outdoor environment temperature lower than or equal 5 ℃ and higher than or equal-20 ℃.
The Defrost method of 13. heat pump type air corditioning systems according to claim 12, is characterized in that, before described steps A, also comprise steps A ':
Outdoor environment temperature, is controlled described cross valve (6) and is switched to refrigeration mode during lower than preset value lower than-20 ℃ or coolant quantity;
Control outer blower fan and stop operating, and the refrigerant that flows into the suction end of described compressor (5) from described indoor heat exchanger (1) is partly imported in the storage heater (7) being wrapped on described compressor (5) outer wall;
The refrigerant that absorbs the interior heat of described storage heater (7) is imported to the suction end of described compressor (5);
Refrigerant after described compressor (5) compression is imported to described outdoor heat exchanger (3) through described cross valve (6).
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| CN201210269782.XA CN103574966B (en) | 2012-07-30 | 2012-07-30 | Heat pump type air corditioning system and Defrost method thereof |
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| CN201210269782.XA CN103574966B (en) | 2012-07-30 | 2012-07-30 | Heat pump type air corditioning system and Defrost method thereof |
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