CN202532795U - Spanning type outer auxiliary heating anti-defrosting device - Google Patents

Spanning type outer auxiliary heating anti-defrosting device Download PDF

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Publication number
CN202532795U
CN202532795U CN2012200883379U CN201220088337U CN202532795U CN 202532795 U CN202532795 U CN 202532795U CN 2012200883379 U CN2012200883379 U CN 2012200883379U CN 201220088337 U CN201220088337 U CN 201220088337U CN 202532795 U CN202532795 U CN 202532795U
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defrosting
refrigerant pipe
heating
compressor
refrigerant
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CN2012200883379U
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龚光彩
唐瑾晨
王晨光
苏欢
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Hunan University
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Hunan University
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Abstract

The utility model discloses a spanning type outer auxiliary heating anti-defrosting device. The spanning type outer auxiliary heating anti-defrosting device comprises a first refrigerant pipe (6) and a second refrigerant pipe (13), wherein the first refrigerant pipe (6) is connected between a throttle valve or a capillary tube (9) and low-temperature heat transfer side (3), and the second refrigerant pipe (13) is connected between a compressor (1) and the low-temperature heat transfer side (3). Outer surfaces of the first refrigerant pipe (6) and the second refrigerant pipe (13) are both coated with heating devices. The spanning type outer auxiliary heating anti-defrosting device adopts systematic defrosting, lowers a compression ratio and improves system properties for refrigerant being too hot, and has the advantages of being simple to operate, short in defrosting time, quick in preheating, high in efficiency and small in energy consumption. In addition, by adopting the spanning type outer auxiliary heating anti-defrosting device, machine halt is not needed, and flow quantity of a working medium does not need to be changed.

Description

The anti-defrosting device of the auxilliary outward heat of a kind of great-leap-forward
Technical field
The utility model relates to a kind of anti-defrosting device, particularly a kind of through be prepended to before the evaporimeter with compressor before outer auxilliary thermal technology prevent defrosting and be refrigerant superheat, thereby reduce compression ratio, the device of raising systematic function.
Background technology
Area, the middle and lower reach of Yangtze River belongs to the Xia Redong cryogenic region in thermal technology's weather subregion, and mean winter temperature is low, and relative humidity is big.And winter under the influence that receives northern strong cold air, the frost or the freezing weather of certain hour can appear.The environmental condition of high humility is these regional characteristics, also is the main cause that causes the serious and service behaviour difference of heat pump frosting.Very easily frosting of evaporimeter when air source heat pump is worked under this environment, the system works performance degradation is serious, passes in time, and the frost layer that grows into causes heat transfer process to worsen, and makes the evaporating temperature of unit reduce.At this moment, because the possibility that liquid has too much increased the compressor liquid hammer is returned in the not evaporation in time of a large amount of liquid refrigerant.And because frequent traditional Defrost mode makes unit be in unsettled duty, heating effect and heating time all can not guarantee.
Traditional Defrost method is that the blower fan of indoor set is shut down, and four-way change-over valve is switched, and air-conditioning system is moved according to refrigeration modes.At this moment the condenser that converts under the cooling condition of outdoor heat exchanger is used.There is following shortcoming in this Defrost mode: because the blower fan of indoor set is shut down, indoor heat exchanger recepts the caloric seldom from indoor environment, and the defrosting relative deficiency makes defrosting time long; Because indoor fan stall, indoor set indoor heat exchanger when defrosting needs draw heat from indoor environment, makes room temperature to descend, and makes indoor environment more abominable.Because defrosting time is long, the defrosting meeting on outdoor heat exchanger top drops on the lower fins, and following face cream lamination is tired a lot, is difficult to remove, and causes ice sheet to pile up, and influences heat exchanger efficiency.A kind of in addition hot gas bypass valve defrosting is to guide the HTHP exhaust into evaporimeter by exhaust outlet of compressor by hot gas bypass valve, defrosts through the heat release of HTHP cooling medium liquefaction.Because the heat of on high-tension side refrigerant still comes from the heat that evaporimeter absorbs, when temperature is lower, the defrosting longer duration will not have enough heat absorption, make main frame get into the protectiveness stopped status.Common electric heater defrosting device is to use heating to make the defrosting thermal source, usually, arranges that according to heating the position is different, and can be further divided into three types: (1) directly is placed on electric heater the surperficial end of heat exchanger; (2) be made of one electric heater and heat exchanger; (3) be placed on electrothermal tube in the refrigerant pipe in the evaporimeter.For preceding two kinds,, be the not breakdown phenomenon that causes the unit electric leakage of ice sheet in order to guarantee humid air because heating is exposed in the humid air.Usually the electric current that flows through heating is also little.When one timing of defrost energy needed, electric current is more little, and for the electric heater defrosting device of having given, its needed defrost time is long more.The third is built in heating in the refrigerant pipe in the evaporimeter, owing to no longer be limited by safe current, defrosting speed gets a promotion.But, to compare with preceding two kinds of electric defrosting modes, electrothermal tube is enclosed within the heat exchange gilled tube, not only requires electrothermal tube to have better stability, has also increased the difficulty of device fabrication cost and manufacturing and maintenance simultaneously.In addition, the simple defrosting controller that the unit interval relay of domestic air-conditioning equipment manufacturer use at present constitutes, its defrosting time is setting value; Can not how much regulating according to frosting degree; If time relay outlet fault, electrothermal tube works long hours, and can burn out air-conditioning equipment.
Return the too much easy possibility that increases liquid hammer of liquid.Utilize the system of hot gas bypass valve defrosting that liquid takes place back easily.No matter adopt cross valve to carry out refrigerating operaton, the operation of heat pump when still adopting the hot gas bypass valve defrosting can be in evaporimeter behind the hot gas defrosting forms big quantity of fluid, and these liquid both might have been got back to compressor when subsequently refrigerating operaton begins.In addition, poor heat transfer during the serious or fan failure of evaporimeter frosting, unevaporated liquid can cause back liquid.The indoor temperature frequent fluctuation can cause that also expansion valve reacts malfunctioning and causes back liquid.Return the liquid hammer accident that liquid causes and occur in mostly in Luftgekuhlte rotierende (being called for short air-cooled or air cooling) semi-closed compressor and the single machine two-stage compressor, because these cylinder of compressor directly communicate with muffler, in case time liquid just is easy to cause the liquid hammer accident.Even without causing liquid hammer, return liquid entering cylinder and will dilute or wash away the lubricating oil on piston and the cylinder wall, the aggravation piston wear.The possibility that returning liquid too much increases liquid hammer was generally passed through by the use of thermal means and was solved.Traditional by the use of thermal means excessively has the backheat circulation and regulates refrigerant perfused amount or regulate refrigerant flow through regulating length capillaceous.After adopting the backheat circulation, pressure decreased when the gas that flash-pot comes out flow through regenerator, thereby had increased the pressure ratio of compressor, caused the increase of work done during compression.Another kind is to regulate the groundwater increment of cold-producing medium or regulate refrigerant flow through regulating length capillaceous; Though this method can make the degree of superheat unlikely too big; Compression final temperature is unlikely too high and damage compressor, but can influence the effect of evaporation and condensation because of the changes in flow rate of cold-producing medium.
The utility model content
The utility model technical problem to be solved provides the defrosting of a kind of system and need not to shut down and working medium is carried out the overheated anti-defrosting device of the auxilliary heat of great-leap-forward that need not to change working medium flow outward.
In order to solve the problems of the technologies described above; The anti-defrosting device of the auxilliary outward heat of the great-leap-forward that the utility model provides; Comprise be connected in first refrigerant pipe between choke valve or capillary and the low-temperature heat exchange side and be connected in compressor and and the low-temperature heat exchange side between second refrigerant pipe, all be coated with heater at the outer surface of described first refrigerant pipe and second refrigerant pipe.
Described heater is the heating and the thermal isolation film that is coated on the outer surface of described heating that is coated on the outer surface of described first refrigerant pipe or second refrigerant pipe.
Described heater is hot water, deep fat or hot gas heat exchanger.
Adopt the anti-defrosting device of the auxilliary heat of great-leap-forward of technique scheme outward; Utilize electricity-Re transfer principle; The electrothermal tube of certain voltage, certain electric current is wrapped in the refrigerant pipe outside that the refrigerant pipe that is connected between capillary or expansion valve and the low-temperature heat exchange side is outer and be connected in low-temperature heat exchange side and compressor; The form that is equivalent to the electric blanket formula wraps in the refrigerant pipe outside; Adopt hot water, deep fat or hot gas heat exchanger be connected in capillary or expansion valve and low-temperature heat exchange side between the refrigerant pipe heat exchange, and then add thermal isolation film reduction energy loss.System defrosts, crosses hot working fluid and need not to shut down, change working medium flow, need not to be provided with by-pass collar, is not only applicable to all air source heat pumps, comprises that also all have the heat pump air conditioner of auxilliary hot heating working medium characteristics.
The utility model provides the auxilliary heat of a kind of great-leap-forward anti-defrosting technology outward to air source heat pump; This technology can not influence under the function that the conventional air-conditioning system freezes summer, heat winter; Can also under the prerequisite of winter heating operation operating mode, uninterrupted indoor heating, before getting into evaporimeter, improve the energy of working medium apace, working medium had under the higher energy situation get into evaporimeter; Prevent the generation of frosting degree; And before getting into compressor, improve the energy of working medium apace, under the situation that does not change refrigerant flow, make working medium have higher energy and get into compressor, prevent the possibility of compressor liquid hammer.And the structure of the preposition outer auxilliary heat of low-temperature heat exchange side and compressor and the coupling of whole system designed.The utility model has overcome because heating is exposed in the humid air, is the not breakdown problem that causes the unit electric leakage of ice sheet in order to guarantee humid air.Also overcome electrothermal tube and be enclosed within the heat exchange gilled tube, not only require electrothermal tube to have better stability, also increased the problem of the difficulty of device fabrication cost and manufacturing and maintenance simultaneously.
In sum; The utility model is that a kind of system prevents defrosting, crosses hot working fluid reduction compression ratio; Improve systematic function, need not to shut down, need not change working medium flow and simple to operate, the defrosting time short, the anti-defrosting device of the overheated auxilliary outward heat of great-leap-forward fast, that efficient is high, power consumption is few.
Description of drawings
Fig. 1 is that the utility model adopts heating heating arrangement sketch map.
Fig. 2 is that the utility model adopts hot water, deep fat or hot-air heater structural representation.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the utility model is described further.The specific embodiment independent assortment that also can see figures.1.and.2.
First kind of embodiment of the utility model can be accomplished according to Fig. 1 at the scene, and be simple and practical.Be based on the auxilliary hot defrost air heat exchanger of evaporimeter electrothermal tube of parameter frost growth rhythm and based on the overheated device sketch map that prevents the compressor liquid hammer of working medium characteristic.
Referring to Fig. 1; Compressor 1 outlet one end links to each other with high temperature heat exchange side 11 through cross valve 2; Through cross valve 2, cross valve 2 was got back to the inlet of compressor through gas-liquid separator 17 again through control valve 16, second refrigerant pipe 13 after one end came out from compressor 1, at second heating 12 that is coated with of the outer surface of second refrigerant pipe 13; Coat second thermal isolation film, 14, the second refrigerant pipes 13 at the outer surface of second heating 12 and be associated with bypass valve 15; High temperature heat exchange side 11 1 ends are communicated with four-way change-over valve 2, the other end and device for drying and filtering 10, the connection of connecting with choke valve or capillary 9; Low-temperature heat exchange side 3 is connected with choke valve or capillary 9 through first refrigerant pipe 6, and the other end enters the mouth with cross valve 2 and is connected, and at first heating 8 that is coated with of the outer surface of first refrigerant pipe 6, coats first thermal isolation film 5 at the outer surface of first heating 8; High temperature heat exchange side 11 can be that water-cooled also can be air-cooled.
Referring to Fig. 1, when carrying out the operation of normal heating condition, first heating 8, second heating 12 are not worked.When needs defrost, the energising of first heating 8, when needs hot working fluid be 12 energisings of second heating.Condensate liquid is through after the entering outer surface is coated with first refrigerant pipe 6 of first heating 8 after the throttling, and refrigerant temperature improves, and can guarantee that like this indoor set is in the heating operation operating mode always, can not have influence on indoor comfort level.Gas-liquid mixture after the evaporation through second heating 12 overheated after, refrigerant temperature suitably improves, and can guarantee the high efficiency work of compressor.
Referring to Fig. 1, first heating 8, second heating, 12 length L, thermal isolation film the 1, second thermal isolation film, 14 length L ', confirm its length and size according to defrosting concurrent heating amount, refrigerant property.
The same Fig. 1 of Fig. 2 basic principle; Just a bit difference on heater; Heating wire has changed first hot water, deep fat, hot gas or heat exchange of heat pipe 19, second hot water, deep fat, hot gas or heat exchange of heat pipe 18 among Fig. 2; Be not that electricity is auxilliary here, be other auxilliary hot modes, it comprises before heat exchange such as hot water, deep fat, hot gas or heat pipe make working medium get into evaporimeter having the purpose that higher energy reaches frost prevention and improves compressor efficiency.
Under cooling condition, then make first heating 8, the 12 no power work of second heating among Fig. 1, then by former cooling condition operation, promptly the anti-defrosting device of great-leap-forward does not start.Then being that first hot water, deep fat, hot gas or heat exchange of heat pipe 19, second hot water, deep fat, hot gas or heat exchange of heat pipe 18 do not provide heat energy among Fig. 2, also is that the anti-defrosting device of great-leap-forward does not start, by former cooling condition operation.Change the four-way change-over valve direction, it is reverse then to illustrate the direction of arrow, by the high steam of compressor 1 discharge; Get into high temperature heat exchange side 11 through cross valve 2, refrigerant vapour is condensed into liquid, gets into low-temperature heat exchange side 3 through choke valve or capillary 9; And heat absorption in low-temperature heat exchange side 3, with room air cooling, the refrigerant vapour after the evaporation; Behind cross valve 2, be compressed machine 1 and suck, go round and begin again like this, realize kind of refrigeration cycle.
The anti-defrosting device of great-leap-forward is for evaporimeter under the heating condition, and this utility model has successfully overcome the existing workflow reengineering complicacy that heats of similar products at home and abroad, and components and parts are changed frequent, are unfavorable for shortcomings such as production and processing.The related defrosting device of the utility model does not have commercial production at present, and the auxilliary device of existing electricity adopts heating needed air of user side or water, but not heating and cooling working medium, thereby efficient is low; Adopt the auxilliary technological installation process of electricity complicated in the evaporimeter, reliably reach the non-constant of security, can't in industrial process, adopt.Though and hot gas bypass defrosting adopts the heating and cooling agent, has influenced the output of heat in winter, and effect is unstable, and user's comfortableness is poor.Backheat increasing compression ratio before the compressor, regulating refrigerant flow influences the evaporative condenser effect.The utility model patent adopts the advanced easy flow process that heats, and components and parts are changed less, are easy to the production and the processing of product, and the control reliability is higher; Compare with the anti-defrosting of auxilliary heat in the great-leap-forward, the user removes to has preferably thermal comfort or output heat and is that system carries out more efficiently, and outer simultaneously auxilliary Re Gengyi realizes that the control reliability is higher.Can successfully prevent the situation of outdoor evaporation side frosting.The utility model has realized that air-conditioning, heat pump assembly cooling or heating effect are good, and guarantees air-conditioning, each components and parts stable operation of heat pump.
The utility model is not limited to above-mentioned preferred forms according to white growth rhythm and refrigerant property, the patent protection section after choke valve or capillary between the low-temperature heat exchange side and comprise that capillary (choke valve) or its part and low-temperature heat exchange side are between the compressor and comprise gas-liquid separator therebetween.If cold-producing medium is not a freon, be Ammonia, then before low-temperature heat exchange side 3, have low-pressure oil storage, heater is located at choke valve or capillary between the low-temperature heat exchange side, comprises low-pressure oil storage, because this heater can be arranged on the low-pressure oil storage.Auxilliary hot heat exchange mode described in Fig. 1 and Fig. 2 is flexible, but combination in any.The heat pump form comprises that all have the heat pump form that can be used for auxilliary hot heating working medium characteristics.Anyone can draw other various forms of products in this section under the enlightenment of the utility model, no matter but on its shape or structure, do any variation, every identical with the utility model or akin technical scheme is all within its protection domain.

Claims (2)

1. the auxilliary outward heat of great-leap-forward is prevented defrosting device; Comprise be connected in first refrigerant pipe (6) between choke valve or capillary (9) and the low-temperature heat exchange side (3) and be connected in compressor (1) and and low-temperature heat exchange side (3) between second refrigerant pipe (13), it is characterized in that: the outer surface at described first refrigerant pipe (6) and second refrigerant pipe (13) all is coated with heater.
2. the anti-defrosting device of the auxilliary outward heat of great-leap-forward according to claim 1 is characterized in that: described heater is for the heating (8,12) on the outer surface that is coated on described first refrigerant pipe (6) or second refrigerant pipe (13) and be coated on the thermal isolation film (5,14) of the outer surface of described heating (8,12).
CN2012200883379U 2012-03-09 2012-03-09 Spanning type outer auxiliary heating anti-defrosting device Active CN202532795U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103123192A (en) * 2013-03-20 2013-05-29 龚光彩 External auxiliary heating frosting-proof capillary throttling integrated device
CN106247710A (en) * 2016-08-19 2016-12-21 安徽省宁国市天成电气有限公司 A kind of pipeline anti-icing equipment
CN106369877A (en) * 2016-11-30 2017-02-01 广东美的制冷设备有限公司 Heat pump system and defrosting control method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103123192A (en) * 2013-03-20 2013-05-29 龚光彩 External auxiliary heating frosting-proof capillary throttling integrated device
CN106247710A (en) * 2016-08-19 2016-12-21 安徽省宁国市天成电气有限公司 A kind of pipeline anti-icing equipment
CN106369877A (en) * 2016-11-30 2017-02-01 广东美的制冷设备有限公司 Heat pump system and defrosting control method thereof

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