CN109579387A - Defrost method based on the air source heat pump system that single outside heat exchanger multiple branch circuit alternately defrosts - Google Patents

Defrost method based on the air source heat pump system that single outside heat exchanger multiple branch circuit alternately defrosts Download PDF

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Publication number
CN109579387A
CN109579387A CN201910028130.9A CN201910028130A CN109579387A CN 109579387 A CN109579387 A CN 109579387A CN 201910028130 A CN201910028130 A CN 201910028130A CN 109579387 A CN109579387 A CN 109579387A
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China
Prior art keywords
branch
defrosting
heat exchanger
expansion valve
electric expansion
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CN201910028130.9A
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CN109579387B (en
Inventor
段彦军
王江
任楠
徐捷
王凯
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Beijing Machinery Equipment Research Institute
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Beijing Machinery Equipment Research Institute
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/02Heat pumps of the compression type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/06Heat pumps characterised by the source of low potential heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat accumulators
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The present invention relates to a kind of Defrost methods of air source heat pump system alternately to be defrosted based on single outside heat exchanger multiple branch circuit, belong to refrigeration, air-conditioning and technical field of heat pumps.It solves the problems, such as air source heat pump defrosting technology in the prior art or significantly affects heating effect or energy consumption is larger or system structure complex effects system compactness.Defrost method of the invention is that first branch electric expansion valve is adjusted to defrosting mode, and second branch electric expansion valve maintains heating mode, carries out first branch defrosting.After the completion of first branch defrosting, the aperture of two branch electric expansion valves is adjusted, carries out second branch defrosting.Aperture by controlling each branch electric expansion valve realizes the switching of branch heating and defrosting function.When defrosting, single branch defrosting, another branch heating heats the waste heat of the absorbable defrosting branch of branch, realizes and defrosts under the premise of not increasing system bulk and weight, additionally not consuming electric energy, while weakening influence of the defrosting process to heating effect.

Description

Defrosting based on the air source heat pump system that single outside heat exchanger multiple branch circuit alternately defrosts Method
Technical field
The present invention relates to refrigeration, air-conditioning and technical field of heat pumps, more particularly to one kind is based on single outside heat exchanger multiple branch circuit The alternately air source heat pump system of defrosting.
Background technique
As the furniture and country of energy crisis are to the popularization of clean energy resource and the development of hot pump in low temp technology, air-source Heat pump warm oneself in winter and domestic hot-water supply in terms of using more and more extensive, but when ambient temperature is lower, be From outside air draw heat, the outside heat exchanger surface temperature of heat pump system can be lower than 0 DEG C, and the water in outside air steams at this time Gas can condense frost be covered on outside heat exchanger surface can be got deeper if frost layer is eliminated not in time, reduce outside heat exchanger change Thermal effect will lead to the failures such as system low-voltage protection or excessive discharge temperature, very to reduce heat pump system heating capacity when serious To causing system unit to damage.
The Defrost technology of currently used comparative maturity has refrigerant inverse defrosting, hot gas bypass defrosting and electric heating to remove Frost, it is also proposed that the mode that double evaporators alternately defrost.
High temperature refrigerant need to be arranged heat exchanger outward by refrigerant inverse defrosting, and low-temperature refrigerant row is exchanged heat inwardly Device will lead to inside high temperature decline, influence inside comfort, and refrigerant commutation is related to the start and stop of multiple components, Not only time-consuming more, refrigerant commutation leads to high-low pressure variation acutely, and very big impact is caused to system element, while being also energy Consume maximum Defrost mode.
Without changing refrigerant flow direction when hot gas bypass defrosting, draw a bypass to outside heat exchanger in exhaust outlet of compressor, By-pass switch control valve is opened when needing to defrost, a part of high-temperature gas of compressor discharge enters outside heat exchanger and removed Frost, a part of high-temperature gas, which still enters inside heat exchanger, to be continued to heat.Although defrosting process heat-production functions do not stop, due to phase When a part of high-temperature gas enters outside heat exchanger, the high-temperature gas into inside heat exchanger is significantly reduced, or can be biggish Influence heating effect.
Electric defrosting needs to increase on heat exchanger on the outside electric calorifie installation, and when defrosting is removed by directly consumption electric energy heating Frost, this mode controls simply, but energy consumption is larger, and electric calorifie installation can obviously increase outside heat exchanger volume.
The Defrost technology of outside heat exchanger alternately defrosting will be wherein on the outside of one group by control system inner valve member in defrosting Heat exchanger is switched to the subcooler of internal exchanger, is defrosted using refrigerant high-temperature residual heat, and one group of defrosting finishes and switches again Another group is defrosted in the same way, such alternate run, preferably improves defrosting efficiency, but heat exchange on the outside of the process that defrosts Device area reduce half still can heating effect on the inside of large effect, and system need to be equipped with heat exchanger on the outside of two groups, two groups Outside heat exchanger also needs respectively to be equipped with blower, needs two four-way valves to switch over and is just able to achieve alternately defrosting, not only system Complexity is higher, is also unfavorable for unit miniaturization.
In conclusion existing air source heat pump defrosting technology or significantly affect heating effect or energy consumption it is larger or influence system System compactedness, it is difficult to meet air source heat pump system future development demand, the present invention can not additionally consume the energy, unknown development Realization defrosting under the premise of ringing heating effect, not changing system bulk.
Summary of the invention
In view of above-mentioned analysis, the embodiment of the present invention is intended to provide one kind based on single outside heat exchanger multiple branch circuit alternately defrosting Air source heat pump system Defrost method, to solve existing air source heat pump defrosting technology or significantly affect heating effect, Or energy consumption is larger or influences system compactness, it is difficult to the problem of meeting air source heat pump system future development demand.
The purpose of the present invention is to provide a kind of air source heat pump systems alternately defrosted based on single outside heat exchanger multiple branch circuit The Defrost method of system, is formed and more easily control mode with simpler system, and defrosting process is allowed more efficiently, more to relax It is suitable, while not increasing system bulk weight.
Defrost method of the invention, comprising the following steps:
S1, first branch electric expansion valve being adjusted to defrosting mode, second branch electric expansion valve maintains heating mode, Carry out first branch defrosting;
After the completion of S2, first branch defrosting, the aperture of two branch electric expansion valves is adjusted, second branch defrosting is carried out.
Preferably, including at least three electric expansion valves, point at least three branches defrost;By controlling electronic expansion The aperture of valve, single branch defrosting, other branches are heated;Successively carry out other branch defrostings.
In step S1, when carrying out first branch defrosting, first branch electric expansion valve standard-sized sheet, second branch electric expansion valve Throttling;The high-temp liquid of inside heat exchanger discharge is directly entered the first branch and defrosts, meanwhile, second branch continues to complete system Heat function.
In step S2, when carrying out second branch defrosting, second branch electric expansion valve standard-sized sheet, first branch electric expansion valve Throttling;The high-temp liquid of inside heat exchanger discharge is directly entered second branch and defrosts, meanwhile, the first branch continues to complete system Heat function.
The pipeline of the first branch and second branch is interlaced, and is uniformly distributed, arbitrarily adjacent four pipelines two-by-two, and two A is the first branch, other two is second branch.
Specifically, the air heat source pumping system includes: outside heat exchanger and inside heat exchanger;The outside heat exchanger One end connects first branch electric expansion valve and second branch electric expansion valve;Pass through control first branch electric expansion valve and the The aperture of two branch electric expansion valves realizes the switching of the first branch, second branch heating and defrosting function.
Specifically, the other end of outside heat exchanger connects four-way valve;Four-way valve connects gas-liquid separator;Gas-liquid separator connects Compressor is connect, gas is separated and is passed through compressor by gas-liquid separator.
Specifically, compressor is connect by four-way valve with one end of inside heat exchanger;Compressor is by low temperature refrigerant gas Compression heating.
Specifically, the other end of inside heat exchanger connects cooling electronic expansion valve;Cooling electronic expansion valve and storage are extra One end of the fluid reservoir of refrigerant connects.
Specifically, the other end of fluid reservoir is connect with device for drying and filtering.
Specifically, device for drying and filtering connection first branch electric expansion valve and second branch electric expansion valve;Dry filter Impurity of the device for being generated during filtration cycle.
It is using the beneficial effect of above-described embodiment:
1, the part of alternately defrosting is limited to single outside heat exchange by using heat exchanger on the outside of multiple branch circuit list by the present invention In device, defrosting can be realized without outside heat exchanger more than two and blower in this way, not will increase system bulk and weight.
2, the present invention is directly entered outside heat exchanger by using the high-temp liquid that inside heat exchanger is discharged and defrosts, It is defrosted using the high-temperature residual heat for completing heating circularly cooling agent, does not consume electric energy additionally, it is more energy saving.
3, the present invention heats the height that branch utilizes the branch that defrosts by rationally designing the branch of outside heat exchanger The waste heat of warm refrigerant is rationally recycled, and the heat transfer effect of heating branch is reinforced, although heat exchanger evaporating surface on the outside of when defrosting Product reduces, but waste heat recycling improves heat transfer temperature difference, will not significantly affect heating effect, increases the comfort of inside.
It in the present invention, can also be combined with each other between above-mentioned each technical solution, to realize more preferred assembled schemes.This Other feature and advantage of invention will illustrate in the following description, also, certain advantages can become from specification it is aobvious and It is clear to, or understand through the implementation of the invention.The objectives and other advantages of the invention can by specification, claims with And it is achieved and obtained in specifically noted content in attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing In, identical reference symbol indicates identical component.
Fig. 1 is system heat-production functions schematic diagram (arrow expression refrigerant flow direction);
Fig. 2 is cooling system functional schematic (arrow expression refrigerant flow direction);
Fig. 3 is two kinds of outside heat exchange manifold arrangement modes.
Appended drawing reference:
Heat exchanger on the outside of 1-;2- first branch electric expansion valve;3- second branch electric expansion valve;The expansion of 4- cooling electronic Valve;Heat exchanger on the inside of 5-;6- compressor;7- four-way valve;8- gas-liquid separator;9- device for drying and filtering;10- fluid reservoir;11- first Bypass line;12- second branch pipeline.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and Together with embodiments of the present invention for illustrating the principle of the present invention, it is not intended to limit the scope of the present invention.
The specific embodiment of the invention provides a kind of air heat source pump system alternately defrosted based on single outside heat exchanger multiple branch circuit The Defrost method of system, comprising the following steps:
S1, firstly, first branch electric expansion valve 2 is adjusted to defrosting mode, second branch electric expansion valve 3 maintains system Heat pattern carries out first branch defrosting;
After the completion of S2, first branch defrosting, the aperture of two branch electric expansion valves is adjusted, second branch defrosting is carried out.
In step S1, when carrying out first branch defrosting, 2 standard-sized sheet of first branch electric expansion valve, second branch electronic expansion Valve 3 throttles;The high-temp liquid that inside heat exchanger 5 is discharged is directly entered the first branch and defrosts;Meanwhile second branch has continued At heat-production functions.
In step S2, when carrying out second branch defrosting, 3 standard-sized sheet of second branch electric expansion valve, first branch electronic expansion Valve throttling;The high-temp liquid that inside heat exchanger 5 is discharged is directly entered second branch and defrosts, meanwhile, the first branch has continued At heat-production functions.
It is worth noting that, the high temperature that the temperature refrigerant liquid that heat exchanger 5 is discharged on the inside of first branch utilization carries When waste heat is defrosted.The temperature of the first branch is apparently higher than second branch, understands some heat and passes through outside heat exchanger 1 Fin and second branch is passed to by the air that the first branch heats, increases the caloric receptivity of second branch low-temperature refrigerant.In this way, By recycling a part of temperature refrigerant liquid waste heat, heating effect can be significantly reduced in defrosting.
In order to ensure heating branch can preferably absorb the waste heat of defrosting branch high-temp liquid, it should be ensured that heating branch Pipeline must have defrosting bypass line adjacent thereto.That is, any adjacent four pipelines two-by-two, two are the first branch, Two are second branch.The pipeline of the first branch and second branch is interlaced, and is uniformly distributed.When system defrosts, single branch Road defrosting, another branch heating, heating branch absorb defrosting branch waste heat.
It should be noted that the air source heat pump system of the present invention alternately defrosted based on single outside heat exchanger multiple branch circuit System, can divide multiple branches to defrost, influence of the more defrosting processes of branch to heating effect is smaller, it is only necessary to according to branch Quantity is equipped with the branch electric expansion valve of identical quantity, and when defrosting, single branch electric expansion valve standard-sized sheet defrosts, remaining branch Road electric expansion valve keeps throttle, continues to complete heat-production functions.By controlling the aperture of each branch electric expansion valve, switching Different branches successively defrost, until heat exchanger all branch defrostings in outside finish.
A specific embodiment of the invention discloses a kind of air alternately to defrost based on single outside heat exchanger multiple branch circuit Source heat pump system.It include: outside heat exchanger 1, first branch electric expansion valve 2, second branch electric expansion valve 3, cooling electronic Expansion valve 4, inside heat exchanger 5, compressor 6, four-way valve 7, gas-liquid separator 8, device for drying and filtering 9, fluid reservoir 10;
The front end connection first branch electric expansion valve 2 and second branch electric expansion valve 3 of outside heat exchanger 1, two electricity Outside heat exchanger 1 is divided to for two branches by sub- expansion valve.A certain branch can be routed heating shape by adjusting branch electronic expansion valve opening State is adjusted to first frost state, in addition, another branch can continue to complete heat-production functions when single spur track defrosts.Pass through control first The aperture of road electric expansion valve 2 and second branch electric expansion valve 3 realizes the switching of two branch heatings and defrosting function, into one Step ground realizes that two branches alternately defrost.
The internal duct of outside heat exchanger 1 is divided into two branches: the first branch and second branch;First branch electronic expansion Valve 2 is connected with the first branch, and second branch electric expansion valve 3 is connected with second branch.The first branch of outside heat exchanger 1 It is interlaced with second branch, and be uniformly distributed.
Fig. 1 is system heat-production functions schematic diagram, when using refrigerant flow direction when this system progress single spur track defrosting and heating Refrigerant flow direction is identical.The four-way valve 7 of system is adjusted to heating mode, and refrigerant flow direction is as shown in Figure 1, followed by first Road electric expansion valve 2 and second branch electric expansion valve 3, outside heat exchanger 1, four-way valve 7, gas-liquid separator 8, compressor 6, four Port valve 7, inside heat exchanger 5, cooling electronic expansion valve 4, fluid reservoir 10 and device for drying and filtering 9.
The work for the air source heat pump system that 1 analysis single outside heat exchanger multiple branch circuit of the invention alternately defrosts with reference to the accompanying drawings Principle:
When being defrosted, the first branch defrosts first, at this time 2 standard-sized sheet of first branch electric expansion valve, the The throttling of two branch electric expansion valves 3, system are switched to first branch defrosting state by heating state.
2 standard-sized sheet of first branch electric expansion valve, does not throttle to the temperature refrigerant liquid to come from inside heat exchanger, The first branch can be considered the subcooler of inside heat exchanger at this time, be carried using the temperature refrigerant liquid that inside heat exchanger 5 is discharged High-temperature residual heat to the first branch of outside heat exchanger 1 carry out heating realize defrosting.Meanwhile second branch electric expansion valve 3 Keep aperture when normal heat-production functions according to current working status, second branch electric expansion valve 3 continues to from inside heat exchanger The temperature refrigerant liquid to come over throttles, and high-temp liquid is cooled to low temperature and low pressure liquid, low temperature and low pressure liquid after throttling It flows into the pipeline of second branch and absorbs heat gasification from external environment,
Second branch continues to complete heat-production functions, to guarantee that heat-production functions will not stop.
During first branch defrosting, the temperature refrigerant liquid for flowing through the first branch, which is further cooled, becomes supercooling Liquid flows through the low-temperature refrigerant liquid of second branch by drawing the heat of vaporization vaporization in external environment.
Refrigerant flows to gas-liquid separator 8 through four-way valve 7 from outside heat exchanger 1, gas-liquid separator 8 by liquid refrigerant and Gas refrigerant separation.8 connect compressor 6 of gas-liquid separator, the cryogenic gas that compressor 6 will be isolated through gas-liquid separator 8 Compression heating.The compressed high-temperature gas of compressor 6 flows to inside heat exchanger 5 through four-way valve 7, and high-temperature gas is through inside heat exchanger 5 transfer thermal energy to inside environment, and the high temperature refrigerant gas of inside energy exchange is completed while improving inside environment temperature Liquefaction is high-temp liquid, completes inside for heat function.
The other end of inside heat exchanger 5 connects cooling electronic expansion valve 4, and refrigerant liquid is flowed through cooling electronic expansion valve 4 To the fluid reservoir 10 of storage excess refrigerant, 10 other end of fluid reservoir connects device for drying and filtering 9, and device for drying and filtering 9, which filters out, to follow The impurity generated during ring.Filtered temperature refrigerant liquid flows to first branch electric expansion valve 2 and second branch electricity Sub- expansion valve 3 completes a first branch defrosting circulation.
After first branch defrosting, adjusted by two-way electronic expansion valve opening, by first branch electric expansion valve 2 It is adjusted to the normal aperture of heat-production functions, by 3 standard-sized sheet of second branch electric expansion valve, second branch defrosting is carried out, realizes first Road replaces defrosting with second branch.
It is finished to second branch defrosting, entire defrosting process terminates, and two branch electric expansion valves are all adjusted to system at this time The normal aperture of heat function, into normal heating state.So far, the defrosting of outside heat exchanger 1 is completed.
Fig. 3 is using the arrangement mode of heat exchange manifold on the outside of when two branches, and arrangement mode is including but not limited to this Two ways, two branches can be preferably uniformly distributed by two kinds of pipeline arrangement modes in Fig. 3.The first branch and second branch Interlaced distribution, can be more uniform defrost.When a certain branch defrosts, another branch continues heat-production functions, Defrosting branch is interlaced with heating branch and is uniformly distributed, and heating branch is enable preferably to recycle defrosting branch high-temperature refrigeration The waste heat of agent liquid can be improved efficiency of energy utilization, reduce influence of the defrosting to heating effect.
When cooling system, four-way valve 7 is adjusted to refrigeration mode, and refrigerant flow direction is according to shown in Fig. 2, followed by refrigeration electricity Sub- expansion valve 4, inside heat exchanger 5, four-way valve 7, gas-liquid separator 8, compressor 6, four-way valve 7, outside heat exchanger 1, heating electricity Sub- expansion valve (first branch electric expansion valve 2 and second branch electric expansion valve 3) heats electric expansion valve in the process Standard-sized sheet.Refrigerant throttles through cooling electronic expansion valve 4 enters inside heat exchanger 5, and refrigerant evaporation is simultaneously inhaled from inner space air Heat is taken, realizes refrigerating function.High-temperature gas is sent into outside heat exchanger 1 after the compression of compressor 6, by heat dissipation to the external world Environment throttles through cooling electronic expansion valve 4 enter inside 5 evaporation endothermic of heat exchanger again, completes a refrigeration cycle.So follow Ring is reciprocal, and inner space heat is endlessly transferred to external environment and realizes lasting refrigeration.
Compared with prior art, the invention has the benefit that
1) structure is simple.The present invention is limited to list by using heat exchanger on the outside of multiple branch circuit list, by the part of alternately defrosting In a outside heat exchanger, only corresponding electric expansion valve need to be equipped with according to number of branches and be controlled, be not required to increase additionally The valve members such as four-way valve, solenoid valve.Defrosting, structure letter can be realized without outside heat exchanger more than two and blower in this way It is single.The present invention is conducive to system structure miniaturization, lightweight, not will increase system bulk and weight.
2) more energy saving.The present invention is directly entered outside by using the temperature refrigerant liquid that inside heat exchanger is discharged Heat exchanger defrosts, and is defrosted using the high-temperature residual heat for completing heating circularly cooling agent, does not consume electric energy additionally.
3) control is simple.When defrosting, the aperture of two outside branch electric expansion valves need to be only adjusted, so that it may complete heating The switching of switching and two branches alternating defrosting functions with defrosting function.
4) heating effect is not reduced.When single spur track of the present invention defrosts, another branch can continue to complete heat-production functions.The present invention It is interlaced and be uniformly distributed to design two branches, be conducive to heat branch to the temperature refrigerant liquid waste heat of defrosting branch into Row recycling.The temperature refrigerant liquid waste heat of defrosting branch passes through the air being heated and passes to heating branch, reinforces heating branch The heat transfer effect on road increases the caloric receptivity of heating branch low-temperature refrigerant.
It is high by recycling defrosting branch although heat exchanger disengagement area reduces on the outside of when defrosting when single spur track defrosts The waste heat of warm refrigerant liquid, improves heat transfer temperature difference, will not significantly affect inside heating effect, increase the comfortable of inside Property.
More than, it is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, it is any In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers It is included within the scope of the present invention.

Claims (10)

1. a kind of Defrost method of the air heat source pumping system alternately to be defrosted based on single outside heat exchanger multiple branch circuit, including following step It is rapid:
S1, first branch electric expansion valve (2) is adjusted to defrosting mode, second branch electric expansion valve (3) maintains heating mould Formula carries out first branch defrosting;
After the completion of S2, first branch defrosting, the aperture of two branch electric expansion valves is adjusted, second branch defrosting is carried out.
2. a kind of air heat source pumping system alternately to be defrosted based on single outside heat exchanger multiple branch circuit according to claim 1 Defrost method, which is characterized in that including at least three electric expansion valves, point at least three branches defrost;Pass through control electricity The aperture of sub- expansion valve, single branch defrosting, other branches are heated;Successively carry out other branch defrostings.
3. a kind of air heat source pumping system alternately to be defrosted based on single outside heat exchanger multiple branch circuit according to claim 1 Defrost method, which is characterized in that in the step S1, when carrying out first branch defrosting, first branch electric expansion valve (2) is complete It opens, second branch electric expansion valve (3) throttling;The high-temp liquid of inside heat exchanger (5) discharge is directly entered first branch progress Defrosting, meanwhile, second branch continues to complete heat-production functions.
4. a kind of air heat source alternately to be defrosted based on single outside heat exchanger multiple branch circuit according to claim 1 or 3 pumps system The Defrost method of system, which is characterized in that in the step S2, when carrying out second branch defrosting, second branch electric expansion valve (3) Standard-sized sheet, first branch electric expansion valve (2) throttling;Inside heat exchanger (5) discharge high-temp liquid be directly entered second branch into Row defrosting, meanwhile, the first branch continues to complete heat-production functions.
5. a kind of air heat source pumping system alternately to be defrosted based on single outside heat exchanger multiple branch circuit according to claim 1 Defrost method, which is characterized in that the pipeline of the first branch and second branch is interlaced, and is uniformly distributed, arbitrarily two-by-two Four adjacent pipelines, two are the first branch, other two is second branch.
6. a kind of air heat source pumping system alternately to be defrosted based on single outside heat exchanger multiple branch circuit according to claim 5 Defrost method, which is characterized in that the heat source pumping system includes: outside heat exchanger (1) and inside heat exchanger (5);The outside One end connection first branch electric expansion valve (2) of heat exchanger (1) and second branch electric expansion valve (3);Pass through control first The aperture of branch electric expansion valve (2) and second branch electric expansion valve (3) realizes the first branch, second branch heating and defrosting The switching of function.
7. a kind of air heat source alternately to be defrosted based on single outside heat exchanger multiple branch circuit according to claim 1-6 The Defrost method of pumping system, which is characterized in that the other end of the outside heat exchanger (1) connects four-way valve (7);The four-way valve (7) gas-liquid separator (8) are connected;Gas-liquid separator (8) connect compressor (6), the gas-liquid separator (8) divide gas From and be passed through compressor (6).
8. a kind of air heat source pumping system alternately to be defrosted based on single outside heat exchanger multiple branch circuit according to claim 7 Defrost method, which is characterized in that the compressor (6) is connect by four-way valve (7) with one end of inside heat exchanger (5);It is described Compressor (6), which compresses low temperature refrigerant gas, to heat up.
9. a kind of air heat source pumping system alternately to be defrosted based on single outside heat exchanger multiple branch circuit according to claim 8 Defrost method, which is characterized in that the other end of the inside heat exchanger (5) connects cooling electronic expansion valve (4);The refrigeration electricity Sub- expansion valve (4) connect with one end of the fluid reservoir (10) of storage excess refrigerant.
10. a kind of air heat source pumping system alternately to be defrosted based on single outside heat exchanger multiple branch circuit according to claim 9 Defrost method, which is characterized in that the other end of the fluid reservoir (10) is connect with device for drying and filtering (9);The dry filter Device (9) connects first branch electric expansion valve (2) and second branch electric expansion valve (3);The device for drying and filtering (9) was used for The impurity generated in filter cyclic process.
CN201910028130.9A 2019-01-11 2019-01-11 Defrosting method of air source heat pump system based on single-outside heat exchanger multi-branch alternate defrosting Active CN109579387B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995015467A1 (en) * 1993-12-02 1995-06-08 M.C. International Refrigerating exchanger, method for controlling same, and refrigeration facility comprising said exchanger
CN203731763U (en) * 2014-01-29 2014-07-23 平武臣 Medium-high-temperature heating and defrosting system of heat pump system
CN204612220U (en) * 2015-01-21 2015-09-02 深圳市沃森空调技术有限公司 Segmentation defrosting air-conditioner
CN105004114A (en) * 2015-07-02 2015-10-28 Tcl空调器(中山)有限公司 Air conditioner and defrosting method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995015467A1 (en) * 1993-12-02 1995-06-08 M.C. International Refrigerating exchanger, method for controlling same, and refrigeration facility comprising said exchanger
CN203731763U (en) * 2014-01-29 2014-07-23 平武臣 Medium-high-temperature heating and defrosting system of heat pump system
CN204612220U (en) * 2015-01-21 2015-09-02 深圳市沃森空调技术有限公司 Segmentation defrosting air-conditioner
CN105004114A (en) * 2015-07-02 2015-10-28 Tcl空调器(中山)有限公司 Air conditioner and defrosting method thereof

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