CN1263238A - Defrost control method of air-cooled heat-pump air-conditioner and its device - Google Patents

Defrost control method of air-cooled heat-pump air-conditioner and its device Download PDF

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Publication number
CN1263238A
CN1263238A CN 00102113 CN00102113A CN1263238A CN 1263238 A CN1263238 A CN 1263238A CN 00102113 CN00102113 CN 00102113 CN 00102113 A CN00102113 A CN 00102113A CN 1263238 A CN1263238 A CN 1263238A
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China
Prior art keywords
air
cavity
defrosting
conditioner
cooled heat
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Granted
Application number
CN 00102113
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Chinese (zh)
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CN1116558C (en
Inventor
邓平安
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Shanghai Credy Intelligent Technology Co., Ltd.
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QINGHUA TAIHAO SCIENCE-TECHNOLOGY Co Ltd
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Priority to CN 00102113 priority Critical patent/CN1116558C/en
Publication of CN1263238A publication Critical patent/CN1263238A/en
Application granted granted Critical
Publication of CN1116558C publication Critical patent/CN1116558C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The present invention provides a new control method for defrosting of air-cooled heat pump air-conditioning machine and its equipment. By utilizing the principle of that after the fin of heat exchanger is frosted, the air flow is blocked and the pressure in the cavity is increased the invented detection and control method can be implemented. said invented method can directly and effectively detect the frosting of heat exchanger of air-cooled heat pump air-conditioning machine, can be matched with environmental temp. sensor so as to can identify that it is frosted or blocked with dirt. Said method is simple and reliable.

Description

The defrosting control method of air-cooled heat-pump air-conditioner and device thereof
The present invention relates to the control method and the device thereof of air-cooled heat-pump air-conditioner defrosting.
Air-cooled heat-pump air-conditioner is a kind of heat absorption from the low-temperature heat source of environment, heat release is to the device in elevated temperature heat source then.This device outdoor section is made up of compressor, heat exchanger, choke valve, blower fan, controller and working medium.Existing air-cooled heat-pump air-conditioner ubiquity the easy frosting of heat exchanger fin under the environment of low temperature and high relative humidity weather, and the frost layer directly influence the heating effect of heat-pump air-conditioner, needs the frequent problem that defrosts.For addressing this problem, common way has three kinds: the 1st kind: with temperature (or loine pressure)---and time control starts defrosting, and with temperature (or loine pressure)---time control defrosting finishes.Principle is after unit enters heating condition, and the cold-producing medium of low-pressure low-temperature enters finned tube exchanger constantly descends coil temperature, and suction temperature also constantly descends.When coil temperature (or pressure of inspiration(Pi)) drops to setting value, temperature-sensitive bag by temperature controller picks up counting signal relay input time, enter defrosting mode simultaneously, when coil temperature (or pressure at expulsion) rises to setting value or defrosting when reaching the maximum duration of setting, defrosting comes to an end.The 2nd kind: use the temperature difference---time control starts defrosting, with temperature (or pressure)---time control defrosting finishes.Principle is after unit enters heating condition, keeps the suitable temperature difference between cold-producing medium in the finned coil and the outdoor air, and liquid refrigerant is being lower than evaporation heat absorption under the bar of outside air temperature.After the frosting of air-coil surface, the EAT and the coil pipe temperature difference increase, and when this temperature difference reaches setting value and also reaches setting value apart from blanking time of last defrosting, promptly start defrosting.When coil temperature (or pressure at expulsion) rose to setting value or defrosting and reaches the longest time of setting, defrosting came to an end.The 3rd kind: adopt method regularly to start defrosting and finish and defrost.1,2 above defrostings can be subjected to all multifactor influences in actual applications, and method 3 then is a kind of Defrost method of timing, and effect is all undesirable.
The control method and the device thereof that the purpose of this invention is to provide a kind of new air-cooled heat pump air-conditioner defrosting can detect the existence of frost directly, exactly, and the foundation that starts and stop as defrosting.Thereby can obviously improve the defrosting effect of air-cooled heat-pump air-conditioner, improve the air-cooled heat-pump air-conditioner operating efficiency.
Defrosting control method of the present invention is achieved in that when blower fan turns round, with the blast in the pressure sensor detection cavity that heat exchanger fin surrounded, with environment temperature sensor testing environment temperature.Described method may further comprise the steps: A compares blast in the described cavity and predetermined wind pressure value during fan operation; The blast of B in described steps A is judged described cavity is higher than when being scheduled to wind pressure value, and environment temperature and predetermined temperature value are compared; C when environment temperature is lower than certain predetermined temperature value, starts defrosting after described step B carries out; D is after described step C carries out, and the blast in the cavity compares with another predetermined wind pressure value again, finishes defrosting when being lower than this predetermined wind pressure value.
The control device of air-cooled heat-pump air-conditioner defrosting of the present invention is achieved in that air-cooled heat-pump air-conditioner has the cavity that is surrounded by the wind heat exchanger fin, above cavity, be provided with blower fan, be provided with a breather pipe in the cavity, the other end of breather pipe is connected to a baroceptor, the place is provided with an environment temperature sensor at wind heat exchanger fin air intake, and the signal that signal of being measured by baroceptor and environment temperature sensor are measured is defeated by controller in the lump through holding wire.
Under the situation that normally heats the no frosting of circulation, the blast that forms in the cavity that the rotation of blower fan surrounds heat exchanger fin is very little.But along with the heat exchanger fin frosting, heat exchanger fin is stopped up by frost gradually, and the gap reduces, and influences flowing of air, and the interior blast of heat exchanger cavity is increased gradually, when blast increases to certain predetermined value, and the defrosting of baroceptor start signal output air conditioner.Along with frost melts, it is unobstructed that air-flow recovers gradually, and blast reduces gradually in the cavity that heat exchanger fin surrounded, and when blast was reduced to another predetermined value, the baroceptor output signal stopped the air conditioner defrosting.The effect of environment temperature sensor is that to be used for differentiating heat exchanger fin be frosting or is blocked by other foul.
The present invention only needs to bore an aperture on the heat exchanger fin of original air-cooled heat-pump air-conditioner, and a breeder tube is inserted in the cavity that heat exchanger surrounded, and the other end of breather pipe is connected on the pressure sensor and gets final product.Therefore structure is simple especially, dependable performance.Simultaneously since be the inside and outside air pressure difference of test chamber the shape of heat exchanging device without any special requirement.Owing to be to adopt breather pipe to connect, improved the anti-electrical interference performance of system in addition.The present invention is useful for the air conditioner of any air-cooled heat pump structure.
The invention will be further described below in conjunction with the drawings and specific embodiments
Fig. 1 is a structural representation of the present invention
Air-cooled heat-pump air-conditioner has the cavity 2 that is surrounded by wind heat exchanger fin 1, is provided with a blower fan 3 above cavity 2.Be provided with a breather pipe 4 in the cavity 2, the other end of breather pipe 4 is connected to a baroceptor 5, also be equipped with on air conditioner and be provided with an environment temperature sensor 7, the signal that signal of being measured by baroceptor 5 and environment temperature sensor 7 are measured is exported to controller 8 in the lump through holding wire 6.

Claims (3)

1, a kind of control method of air-cooled heat-pump air-conditioner defrosting is characterized in that: when blower fan (3) turns round, detect the interior blast of cavity (2) that heat exchanger fin (1) is surrounded with pressure sensor (5), with environment temperature sensor (7) testing environment temperature.Described method may further comprise the steps: (A) during fan operation, blast and predetermined wind pressure value in the described cavity (2) are compared; (B) blast in described step (A) is judged described cavity (2) is higher than when being scheduled to wind pressure value, and environment temperature and predetermined temperature value are compared; (C) after described step (B) is carried out, when environment temperature is lower than certain predetermined temperature value, start defrosting; (D) after described step (C) is carried out, the blast in the cavity (2) compares with another predetermined wind pressure value again, finishes defrosting when being lower than this predetermined wind pressure value.
2, a kind of air-cooled heat-pump air-conditioner defrosting control device, air-cooled heat-pump air-conditioner has the cavity (2) that is surrounded by heat exchanger fin (1), be provided with a blower fan (3) in cavity (2) top, it is characterized in that: be provided with a breather pipe (4) in the cavity (2), the other end of breather pipe (4) is connected to a baroceptor (5), exports to controller (8) by the signal that baroceptor (5) is measured through holding wire (6).
3, according to the described defrosting control device of claim 2, it is characterized in that: also be provided with an environment temperature sensor (7) on air conditioner, the signal that signal that environment temperature sensor (7) is measured and baroceptor (5) are measured is exported to controller (8) in the lump through holding wire (6).
CN 00102113 2000-02-03 2000-02-03 Defrost control method of air-cooled heat-pump air-conditioner and its device Expired - Fee Related CN1116558C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 00102113 CN1116558C (en) 2000-02-03 2000-02-03 Defrost control method of air-cooled heat-pump air-conditioner and its device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 00102113 CN1116558C (en) 2000-02-03 2000-02-03 Defrost control method of air-cooled heat-pump air-conditioner and its device

Publications (2)

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CN1263238A true CN1263238A (en) 2000-08-16
CN1116558C CN1116558C (en) 2003-07-30

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007059710A1 (en) * 2005-11-25 2007-05-31 Gree Electric Appliances Inc. Of Zhuhai An intelligent defrosting control method for an air conditioner
CN102494369A (en) * 2011-12-29 2012-06-13 海信(山东)空调有限公司 Air-conditioning outdoor machine, air conditioner and air-conditioning defrosting method
CN102620351A (en) * 2012-04-12 2012-08-01 普鲁卡姆电器(上海)有限公司 Electric auxiliary heating system for heat pump air-conditioner
CN102648384A (en) * 2009-11-25 2012-08-22 大金工业株式会社 Refrigeration device for container
CN102138048B (en) * 2008-09-01 2013-05-15 三菱电机株式会社 Heat pump device
CN105091233A (en) * 2015-08-11 2015-11-25 珠海格力电器股份有限公司 Method and device for detecting frosting of air conditioner outdoor unit
CN106091251A (en) * 2016-06-14 2016-11-09 珠海格力电器股份有限公司 A kind of dirty stifled determination methods for heat exchanger, device and air-conditioning
CN106288144A (en) * 2016-07-26 2017-01-04 广东美的暖通设备有限公司 Air-conditioner and Defrost method thereof

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007059710A1 (en) * 2005-11-25 2007-05-31 Gree Electric Appliances Inc. Of Zhuhai An intelligent defrosting control method for an air conditioner
CN102138048B (en) * 2008-09-01 2013-05-15 三菱电机株式会社 Heat pump device
CN102648384A (en) * 2009-11-25 2012-08-22 大金工业株式会社 Refrigeration device for container
CN102648384B (en) * 2009-11-25 2014-06-18 大金工业株式会社 Refrigeration device for container
CN102494369A (en) * 2011-12-29 2012-06-13 海信(山东)空调有限公司 Air-conditioning outdoor machine, air conditioner and air-conditioning defrosting method
CN102620351A (en) * 2012-04-12 2012-08-01 普鲁卡姆电器(上海)有限公司 Electric auxiliary heating system for heat pump air-conditioner
CN105091233A (en) * 2015-08-11 2015-11-25 珠海格力电器股份有限公司 Method and device for detecting frosting of air conditioner outdoor unit
CN105091233B (en) * 2015-08-11 2018-06-01 珠海格力电器股份有限公司 The frosting detection method and device of air-conditioner outdoor unit
CN106091251A (en) * 2016-06-14 2016-11-09 珠海格力电器股份有限公司 A kind of dirty stifled determination methods for heat exchanger, device and air-conditioning
CN106091251B (en) * 2016-06-14 2019-05-07 珠海格力电器股份有限公司 A kind of dirty stifled judgment method, device and air-conditioning for heat exchanger
CN106288144A (en) * 2016-07-26 2017-01-04 广东美的暖通设备有限公司 Air-conditioner and Defrost method thereof

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