CN1325858C - Defroasting method of air cooling heat pump system and its defroasting device - Google Patents
Defroasting method of air cooling heat pump system and its defroasting device Download PDFInfo
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- CN1325858C CN1325858C CNB031506097A CN03150609A CN1325858C CN 1325858 C CN1325858 C CN 1325858C CN B031506097 A CNB031506097 A CN B031506097A CN 03150609 A CN03150609 A CN 03150609A CN 1325858 C CN1325858 C CN 1325858C
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Abstract
The present invention discloses a defrosting method of an air cooling heat pump system. The present invention is characterized in that condensing pressure is controlled in the defrosting process; the condensing pressure can be controlled by a pressure difference control valve and a condensing pressure regulating valve, and can be controlled singly by a condensing pressure control valve. The defrosting device comprises an air heat exchanger and a reservoir, wherein a pressure control device is respectively arranged between an inlet/outlet of the air heat exchanger and an inlet of the reservoir. The pressure control device comprises a pressure difference controller and the condensing pressure control valve. One-way valves are also arranged on passages of the outlets of an air side heat exchanger and the inlets of the condensing pressure regulating valve and the reservoir. The high efficient defrosting method of an air cooling heat pump can control the condensing pressure so that the high and low pressure of the system can be rapidly restored to a normal state, and accordingly, the aim for rapidly and thoroughly defrosting is achieved.
Description
Technical field
The present invention relates to a kind of Defrost method and defroster thereof of the Defrost method that is used for refrigeration system, particularly a kind of air-cooled heat pump unit.
Technical background
Existing air-cooled heat pump unit device generally as shown in Figure 1.Air-Cooled Heat Pump Unit is when heating operation, because outdoor temperature is low, and air-side heat exchanger 3 surface meeting frostings gradually, along with the thickening of frost layer, the leaving air temp and the heating capacity of heat exchanger 9 reduce gradually in the machine, and should defrost this moment.Whether defrosting thoroughly is the problem that must pay close attention to; if it is not thorough to defrost; enter heat after; frost layer of not removing and defrost water will be frozen into bigger frost of density or ice; be difficult to melting again next time, influence heating effect, cause low-voltage variation; excessive discharge temperature, even cause compressor 1 to damage.
Air-Cooled Heat Pump Unit adopts anti-circulation defroster at present mostly, and cross valve 2 actions as condenser, defrost air-side heat exchanger 3 when promptly defrosting to its conveying capacity.There is the defrosting scarce capacity in this defroster, and the shortcoming that the defrost time is long, basic reason are that system's high-low pressure can not recover normal in the defrost process in the long time, and compressor operating is undesired, shows as follows:
1) after the defrosting beginning, the high and low pressure in the refrigeration system is on the low side, and circulating mass of refrigerant is little, and compressor air suction is few, is easy to generate low-voltage variation.The high-low pressure of system often just recovers normal in defrosting when soon finishing, effectively the defrost time is shorter.
2) in defrosting back one period long period of beginning, because the high and low pressure in the refrigeration system is on the low side, compressor power input and refrigerating capacity are well below specified cooling condition analog value, and compressor capacity can not be brought into play, a little less than the defrosting ability.
Summary of the invention
The objective of the invention is to provide for the deficiency that solves above-mentioned technology a kind of can be to the quick-recovery normal condition soon in the course of the work of condensation high-low pressure in the refrigeration system, thereby reach the Defrost method and the defroster thereof of a kind of air-cooled heat pump unit of the purpose that fast, thoroughly defrosts.
In order to achieve the above object, the Defrost method of a kind of air-cooled heat pump unit that the present invention is designed is in defrost process condensing pressure to be controlled, and the control of condensing pressure both can have been adopted differential pressure control valve and the synergy of condensation pressure regulation valve.The defroster of its realization of Defrost method of this air-cooled heat pump unit, it comprises air heat exchanger and reservoir, between air heat exchanger import and export and reservoir import, be provided with pressure control device, described pressure control device comprises differential pressure controller and condensation pressure regulation valve, between air-side heat exchanger import and reservoir import, be connected a differential pressure controller, between air-side heat exchanger outlet and reservoir import, be connected a condensation pressure regulation valve, export at air-side heat exchanger, also be provided with check valve on the path of condensation pressure regulation valve and reservoir import, differential pressure controller exit position or between check valve and reservoir; Or between condensation pressure regulation valve and check valve; Or between condensation pressure regulation valve and reservoir import.In order to improve the defrosting ability of air-cooled heat pump unit, must shorten the time that system's high-low pressure recovers normal condition, the circulating mass of refrigerant when improving defrosting as far as possible.Circulating mass of refrigerant when existing defroster is often only paid attention to improve defrosting is not but recognized the condensing pressure when improving defrosting, makes the high-low pressure of system keep the basic place that normally is only solution defrosting problem.For this reason, a kind of air-cooled heat pump highly effective defrosting method provided by the invention and resulting defroster thereof are compared with general air-cooled heat pump unit, have following characteristics:
1) after the defrosting beginning, (about half a minute) in the short period of time, condensing pressure recovers normal (greater than the setting pressure 10bar of condensation pressure regulation valve 12), and the invalid defrost time is short.
2) after condensing pressure recovered normally, circulating mass of refrigerant and compressor power input were near specified cooling condition analog value, and the defrosting ability is strong, and required defrosting time is short, and defrosting thoroughly.
3) independent reservoir must be set in system, and enough refrigerant charges will be arranged, to guarantee still having certain liquid level in the defrost process reservoir; Otherwise, the gases at high pressure bypass, the circulating mass of refrigerant deficiency, system can produce low-voltage variation.
4) because defrosting is very capable, refrigerant liquid needs a large amount of heat of heat exchanger absorption in the slave.For air-cooled cold and hot wind-heat pump assembly, in order to prevent " blowing a cold wind over " phenomenon, the auxiliary electrical heating power that needs is bigger.For the wind cooling cold and hot water source pump, owing to can directly from recirculated water, absorb heat, can close the user side fan, avoid " blowing a cold wind over "; Because it is defrosting time is short, less simultaneously to the influence of fluctuations of water temperature.
Description of drawings
Fig. 1 is the Air-Cooled Heat Pump Unit structural representation of prior art;
Fig. 2 is the Air-Cooled Heat Pump Unit example structure schematic diagram that the present invention adopts condensing pressure control;
Fig. 3 is a single valve spare condensing pressure control Air-Cooled Heat Pump Unit example structure schematic diagram;
Fig. 4 is the Air-Cooled Heat Pump Unit structural representation of embodiment 3;
The specific embodiment
The invention will be further described in conjunction with the accompanying drawings below by embodiment, but following embodiment does not limit content of the present invention.
Embodiment 1:
As shown in Figure 2.A kind of air-cooled heat pump highly effective defrosting method that present embodiment is described, be in defrost process, condensing pressure to be controlled, differential pressure control valve and the synergy of condensation pressure regulation valve are adopted in the control of condensing pressure, it comprises air-side heat exchanger 3 and reservoir 4 defroster of its enforcement, between air-side heat exchanger 3 import and export and reservoir 4 imports, be provided with pressure control device, described pressure control device comprises differential pressure controller 11 and condensing pressure control valve 12, between air-side heat exchanger 3 imports and reservoir 4 imports, be connected a differential pressure controller 11, between air-side heat exchanger 3 outlets and reservoir 4 imports, be connected a condensing pressure control valve 12.Compare with general air-cooled heat pump unit, this system has increased by two valve members and has been used to control condensing pressure---differential pressure control valve 11 and condensation pressure regulation valve 12 (can buy in the market).When the inlet pressure of condensation pressure regulation valve 12 standard-sized sheet during greater than setting pressure (generally can be set at 10bar), be lower than setting value then part open.The opening pressure difference of differential pressure control valve 11 generally is set at 1.4bar, and the standard-sized sheet pressure differential is 3bar.Condensation pressure regulation valve 12 and differential pressure control valve 11 synergy have sufficiently high condensing pressure in the time of can guaranteeing system's defrost cycle.
Heat circulation time normally, cold-producing medium is without differential pressure control valve 11 and condensation pressure regulation valve 12.Summer is during refrigerating operaton, and condensation pressure regulation valve 12 complete openings, differential pressure control valve 11 complete shut-downs are very little to normal kind of refrigeration cycle influence, have just increased the pressure drop (12 pressure drops of condensation pressure regulation valve are very little) of liquid line a little.
When system need defrost, cross valve 2 actions, the compressed machine 1 of refrigerant gas flows through cross valve 2, enters air-side heat exchanger 3.Lower when defrosting has just begun owing to air-side heat exchanger 3 internal pressures, thereby condensation pressure regulation valve 12 complete shut-downs, differential pressure control valve 11 is opened.Along with refrigerant liquid is cumulative in air-side heat exchanger 3, condensing pressure raises gradually; Simultaneously, because constantly the entering of vapours, the temperature in the reservoir 4, pressure rise.In this process, condensation pressure regulation valve 12 is opened gradually, differential pressure control valve 11 turns down gradually.Along with defrost process continue carry out, frost layer constantly reduces, during to the defrosting end, condensation pressure regulation valve 12 complete openings, differential pressure control valve 11 complete shut-downs, unit enters the next one again and heats circulation subsequently.
Embodiment 2:
Different according to control valve member structure of condensing pressure and performance, adopt the air-cooled heat pump unit of condensing pressure control can adopt the condensing pressure control valve to control separately, as shown in Figure 3, the described pressure control device of present embodiment is a condensing pressure control valve 13, the import and export of air-side heat exchanger 3 are two input ports of condensing pressure control valve 13, and the delivery outlet of condensing pressure control valve 13 is connected with reservoir 4 by check valve 5.Its feature is to adopt single valve member condensing pressure control valve 13 to replace differential pressure control valve 11 and condensation pressure regulation valve 12.13 variations to outlet pressure of condensing pressure control valve react, and open when outlet pressure rises.Except the control outlet pressure, the working method of condensing pressure control valve 13 is identical with the system that adopts differential pressure control valve 11 and condensation pressure regulation valve 12, can reach the purpose of condensing pressure in the control defrost process equally.In order to prevent to heat the circulation time refrigerant liquid without reservoir 4 and air-side heat exchanger 3 and directly get back to compressor 1 and cause liquid hammer, condensing pressure control valve 13 places the front of check valve 5.
Embodiment 3:
The Defrost method and the defroster thereof of a kind of air-cooled heat pump unit that present embodiment is described, be in air-side heat exchanger 3 outlets, also be provided with check valve 5 on the path of condensation pressure regulation valve 12 and reservoir 4 imports, check valve 5 can be as shown in Figure 2, be located at the import of condensation pressure regulation valve 12, also can be as shown in Figure 4, be located at the outlet of condensation pressure regulation valve 12, the exit position of differential pressure control valve 11 both can be between check valve 5 and reservoir 4, can between condensation pressure regulation valve 12 and check valve 5, can also be between condensation pressure regulation valve 12 and reservoir 4 imports also.
Claims (1)
1, a kind of defroster of air-cooled heat pump unit, it comprises air-side heat exchanger (3) and reservoir (4), it is characterized in that between air-side heat exchanger (3) import and export and reservoir (4) import, being provided with pressure control device, described pressure control device comprises differential pressure controller (11) and condensation pressure regulation valve (12), between air-side heat exchanger (3) import and reservoir (4) import, be connected a differential pressure controller (11), between air-side heat exchanger (3) outlet and reservoir (4) import, be connected a condensation pressure regulation valve (12), export at air-side heat exchanger (3), also be provided with check valve (5) on the path of condensation pressure regulation valve (12) and reservoir (4) import, differential pressure controller (11) exit position or be positioned at check valve (5) and reservoir (4) between; Or be positioned between condensation pressure regulation valve (12) and the check valve (5); Or be positioned between condensation pressure regulation valve (12) and reservoir (4) import.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031506097A CN1325858C (en) | 2003-08-28 | 2003-08-28 | Defroasting method of air cooling heat pump system and its defroasting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031506097A CN1325858C (en) | 2003-08-28 | 2003-08-28 | Defroasting method of air cooling heat pump system and its defroasting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1590930A CN1590930A (en) | 2005-03-09 |
| CN1325858C true CN1325858C (en) | 2007-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031506097A Expired - Fee Related CN1325858C (en) | 2003-08-28 | 2003-08-28 | Defroasting method of air cooling heat pump system and its defroasting device |
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| Country | Link |
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| CN (1) | CN1325858C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865552A (en) * | 2010-06-22 | 2010-10-20 | 合肥天鹅制冷科技有限公司 | Air conditioning equipment |
| CN103292530A (en) * | 2013-04-17 | 2013-09-11 | 张小明 | Pressure difference switch pulse heating-up defrosting design for compression refrigeration systems |
| CN103292531A (en) * | 2013-04-17 | 2013-09-11 | 张小明 | Pressure difference switch heating-up defrosting design for compression heating systems |
| WO2014169703A2 (en) * | 2013-04-17 | 2014-10-23 | Zhang Xiaoming | Pulse heating energy-saving device for use with compression-type cooling or heating system |
| CN103322738A (en) * | 2013-04-17 | 2013-09-25 | 张小明 | Temperature difference switch heating and defrosting design applied to compression type heating system |
| CN103292533A (en) * | 2013-04-17 | 2013-09-11 | 张小明 | Temperature difference switch pulse heating-up defrosting design for compression refrigeration systems |
| CN103575006A (en) * | 2013-11-25 | 2014-02-12 | 广东申菱空调设备有限公司 | Low-temperature refrigeration type air-cooling water chilling unit and control method thereof |
| CN108895722A (en) * | 2018-05-25 | 2018-11-27 | 广东芬尼克兹节能设备有限公司 | A kind of air-source heat exchanger system |
| CN111219852B (en) * | 2020-01-10 | 2021-07-27 | 宁波奥克斯电气股份有限公司 | Defrosting method and device, air conditioner and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4949554A (en) * | 1989-09-08 | 1990-08-21 | Specialty Equipment Companies, Inc. | Single pane, curved glass lid, frozen food merchandiser |
| JPH04356667A (en) * | 1991-05-31 | 1992-12-10 | Daikin Ind Ltd | Heat pump type refrigerating apparatus |
| US6272870B1 (en) * | 1999-10-27 | 2001-08-14 | Emerson Electric Co. | Refrigeration system having a pressure regulating device |
-
2003
- 2003-08-28 CN CNB031506097A patent/CN1325858C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4949554A (en) * | 1989-09-08 | 1990-08-21 | Specialty Equipment Companies, Inc. | Single pane, curved glass lid, frozen food merchandiser |
| JPH04356667A (en) * | 1991-05-31 | 1992-12-10 | Daikin Ind Ltd | Heat pump type refrigerating apparatus |
| US6272870B1 (en) * | 1999-10-27 | 2001-08-14 | Emerson Electric Co. | Refrigeration system having a pressure regulating device |
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| CN1590930A (en) | 2005-03-09 |
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Owner name: ZHEJIANG DUNAN MECHANICAL + ELECTRICAL SCIENCE CO. Free format text: FORMER OWNER: DUNAN ARTIFICIAL ENVIRONMENTAL APPARATUS CO., LTD., ZHEJIANG PROV. Effective date: 20090508 |
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Effective date of registration: 20090508 Address after: Industrial District, Zhuji Town, Zhejiang Patentee after: Zhejiang Dunan Electromechanical Technology Co.,Ltd. Address before: 8 building, No. 168 water supply building, Jianguo South Road, Hangzhou, Zhejiang Patentee before: Zhejiang Dun'an Artificial Environment Equipment Co., Ltd. |
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