CN100562697C - Low-temperature heat pump air conditioner and automatic defrosting method thereof - Google Patents
Low-temperature heat pump air conditioner and automatic defrosting method thereof Download PDFInfo
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- CN100562697C CN100562697C CNB2005100799034A CN200510079903A CN100562697C CN 100562697 C CN100562697 C CN 100562697C CN B2005100799034 A CNB2005100799034 A CN B2005100799034A CN 200510079903 A CN200510079903 A CN 200510079903A CN 100562697 C CN100562697 C CN 100562697C
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Abstract
The present invention is a kind of low-temperature heat pump air conditioner and automatic defrosting method thereof, it mainly comprises vapour liquid separator, compressor, evaporimeter and condenser, be installed in the outer coil temperature sensor on the described condenser, be installed near the environment temperature sensor of inlet side fin of described condenser, be arranged on last heating tape and following heating tape on the vapour liquid separator, be wrapped in the outer field thermal insulating warm-keeping layer of described vapour liquid separator.Heating in the process of this low-temperature heat pump air conditioner, realize the non-frosting operation of condenser by the method for cold-producing medium being carried out degree of superheat compensation.The heat transfer temperature difference that uses low-temperature heat pump air conditioner of the present invention to keep relative stability, and it is remained between 1.5 ℃ to 3 ℃, thereby under the realization low temperature environment, relative humidity is the condenser frost-free under the situation below 80%, the stable operation process that heats that air-conditioning remains, save electric energy, heating effect is good.
Description
Technical field
The present invention relates to a kind of low-temperature heat pump air conditioner and automatic defrosting method thereof, especially relate to a kind of degree of superheat compensation of carrying out, prevent the low-temperature heat pump air conditioner and the automatic defrosting method thereof of condenser frosting.
Background technology
At present, general heat pump air conditioner reduces with ambient temperature when entering winter heating's work, and heating effect descends rapidly.Reason is after low-temp low-pressure gas in the vapour liquid separator (cold-producing medium after the gasification) is inhaled into compressor, compressed machine compression, and low-temp low-pressure gas is transformed into high temperature and high pressure gas, enters under the control by cross valve and heats circulation.In heating circulation, high temperature and high pressure gas enters indoor set condenser (being evaporimeter in the process of refrigerastion) through three-way cut-off valve, carries out heat exchange with indoor environment, and at this moment, high temperature and high pressure gas is transformed into low-temp low-pressure liquid.Low-temp low-pressure liquid is through two logical stop valves, effect by capillary (throttling boosting), its pressure is improved, in evaporimeter (being condenser in the process of refrigerastion), be transformed into gas or gas-liquid mixture, simultaneously the absorbing environmental heat, then under the control of cross valve, enter vapour liquid separator. finish one and heat circulation, this process circulates repeatedly, finishes the process that heats of low-temperature heat pump air conditioner.In evaporimeter, when low-temp low-pressure liquid is transformed into gas or gas-liquid mixture, the absorbing environmental heat, during low and high humidity, easily cause the frosting of external condensation device when ambient temperature, the off-premises station heat exchange efficiency is reduced, and be easy to generate back liquid, compressor is burnt in long-term operation easily.
Actual motion shows, when outside air temperature at-2～7 ℃, and relative humidity is greater than 50% o'clock, the frosting situation of condenser finned coil is the most serious.Along with the formation of frost layer, the performance of unit descends, and operating mode worsens, and heating capacity also will descend.Its finned coil heat exchanger, because evaporating temperature is lower, outdoor temperature is lower, the temperature of coil surface also descends thereupon, even is lower than 0 ℃.When outdoor air was flowed through coil pipe under blower fan drives, its contained moisture will be separated out and be attached to coil surface and be formed the frost layer.Relative air humidity is big more, and the coil pipe frosting is just serious more.
The Defrost method of heat pump air conditioner generally adopts the way that changes refrigerant flow direction at present.That is to say, when air-conditioner need defrost, transfer air-conditioner to the refrigeration mode operation, make the off-premises station heat exchanger play the condenser effect, this moment, refrigerant can be emitted heat, utilized this heat that frosting is melted.After air-conditioner enters heating operation, generally want continuous operation after 50 minutes, computer begins the coil temperature of continuous detecting off-premises station heat exchanger, if this temperature is less than 11 ℃, then air-conditioner enters Defrost operation, the control cross valve makes air-conditioner enter kind of refrigeration cycle, and general defrosting time is no more than 8 minutes.In defrost process, computer is the coil temperature of continuous detecting off-premises station heat exchanger, and picks up counting from defrosting, when detected coil temperature rise to 〉=10 ℃ the time or time of defrosting when having reached 8 minutes, defrosting just finishes automatically.This moment, compressor also stopped.After 10 seconds, cross valve switches to and heats the position, and through after 1 minute, air-conditioner enters the state of heating again again.
Adopted above-mentioned solution among the Chinese patent CN2562113Y, to realize automatic defrosting system.Implementation method is for being provided with a defrost liquid medium bypass line on the air heat source and thermal pump system-based, its function is when air heat source and thermal pump is made Defrost operation, four-way change-over valve switches to the refrigerating operaton state, the cold of the outer frost layer of outdoor heat converter inner high voltage hot operation GAS ABSORPTION pipe makes the liquefaction of frost layer.
Use the heat pump air conditioner of present automatic defrosting technology to adopt defrosting regularly or constant temperature defrosting dual mode.This Defrost technology makes heat pump enter the refrigerating operaton state by the four-way change-over valve switching and realizes, it influences the whole heating effect of heat pump, causes energy dissipation.
Summary of the invention
According to the deficiency of above existing heat pump air conditioner Defrost technology, the objective of the invention is to propose a kind of degree of superheat compensation that utilizes, prevent the low-temperature heat pump air conditioner and the automatic defrosting method thereof of condenser frosting.
Low-temperature heat pump air conditioner of the present invention, it mainly comprises vapour liquid separator, compressor, evaporimeter and condenser is characterized in that also comprising, an outer coil temperature sensor is installed on the described condenser; One environment temperature sensor is installed near the inlet side fin of described condenser; One heating tape, be arranged on the vapour liquid separator, described heating tape is made up of last heating tape and following heating tape, and the outdoor environment temperature Th that detects according to described environment temperature sensor opens or closes with the temperature range of the condenser coil temperature T g of outer coil temperature sensor detection.
Low-temperature heat pump air conditioner of the present invention also comprises a thermal insulating warm-keeping layer, and it is wrapped in the skin of described vapour liquid separator, and described thermal insulating warm-keeping layer is formed by adiabatic heat-insulation is cotton.The described power of going up the heating tape is 25w, and the described power of heating tape down is 40w.
The automatic defrosting method of low-temperature heat pump air conditioner of the present invention is characterized in that heating in the process at described low-temperature heat pump air conditioner, and the method that cold-producing medium is carried out degree of superheat compensation realizes the non-frosting operation of condenser.
Described method of cold-producing medium being carried out degree of superheat compensation is by to controlling described heating tape and realizing for described vapour liquid separator provides thermal insulating warm-keeping layer.
The automatic adjusting of the switch of heating tape and load is to realize according to the condenser coil temperature T g of outer coil temperature sensor detection and the outdoor environment temperature Th of environment temperature sensor detection by off-premises station computer buttress.
When 1.5 ℃≤Th-Tg≤5 ℃, off-premises station computer plate is only opened the heating tape; When Th-Tg＞5 ℃, all open the heating tape up and down; When Th-Tg＜1.5 ℃, heating tape Close All up and down.
The heat transfer temperature difference that uses low-temperature heat pump air conditioner of the present invention to keep relative stability, and it is remained between 1.5 ℃ to 3 ℃, thereby under the realization low temperature environment, relative humidity is the condenser frost-free under the situation below 80%, air-conditioning remains the stable operation process that heats, save electric energy, heating effect is good.
Embodiment to low-temperature heat pump air conditioner of the present invention is elaborated below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the systematic schematic diagram of low-temperature heat pump air conditioner of the present invention;
Fig. 2 is the vapour liquid separator structural representation of low-temperature heat pump air conditioner of the present invention.
Among the figure:
1 three-way cut-off valve, 10 condensers
2 vapour liquid separators, 11 filters
3 suction temperature sensors, 12 capillaries
4 compressors, 13 2 logical stop valves
5 silencers, 14 evaporimeters
6 exhaust sensors, 15 inner coil pipe sensors
16 times heating tapes of 7 cross valves
Heating tape on the 8 outer coil temperature sensors 17
9 environment temperature sensors, 18 adiabatic heat-insulation cottons
The specific embodiment
Low-temperature heat pump air conditioner of the present invention, generally be used for air-cooled low-temperature heat pump air conditioner, its off-premises station is the unified outer machine of DC frequency-changing one-to-one, its interior machine can with wall hanging machine, hang machine, the cassette machine, coil insertion devices etc. freely mate, the outer machine of general 2P adopts capillary-compensated, 3P and above outer machine thereof adopt the expansion valve throttling, the difference of it and other general heat pump air conditioners is, has increased heating tape and adiabatic heat-insulation cotton on the vapour liquid separator of this heat pump air conditioner, and has increased switch and load control to the heating tape in off-premises station computer plate.The heating tape is by connecting the middle and lower part of ring spring around vapour liquid separator, and the use of heating tape can improve the suction temperature of compressor, and enough degrees of superheat that compensation does not realize by heat exchanger help the work of vapour liquid separator simultaneously.The use of adiabatic heat-insulation cotton guarantees that the heat that the heating tape produces effectively heats vapour liquid separator, prevents that heat outwards scatters and disappears.
Make below in conjunction with accompanying drawing and to further specify.
Fig. 1 is the systematic schematic diagram of low-temperature heat pump air conditioner of the present invention.Referring to Fig. 1, the associated components of low-temperature heat pump air conditioner of the present invention comprises, the exhaust outlet of vapour liquid separator 2 links to each other with the air inlet of compressor 4, the exhaust outlet of compressor 4 links to each other with the air inlet of evaporimeter 14 through cross valve 7, three-way cut-off valve 1, the liquid outlet of evaporimeter 14 links to each other with the inlet of condenser 10 through two logical stop valves 13, capillary 12, filter 11, and the gas outlet of condenser 10 links to each other with vapour liquid separator 2 air inlets through cross valve 7.Suction temperature sensor 3 is positioned in the sleeve pipe that is welded on the air intake duct, and outer coil temperature sensor 8 is positioned at the middle part of condenser 10, and inner coil pipe sensor 15 is positioned at evaporimeter 14 middle parts, and environment temperature sensor 9 is positioned near the condenser 10 inlet side fin.
In the process of heating, after the low-temp low-pressure gas in the vapour liquid separator 2 (cold-producing medium after the gasification) is inhaled into compressor 4, compressed machine 4 compressions, low-temp low-pressure gas is transformed into high temperature and high pressure gas, under the control of cross valve 7, enters and heats circulation.In heating circulation, low-temp low-pressure gas enters indoor machine evaporation 14 (heat and be condenser in the process) through three-way cut-off valve 1, and at room temperature, high temperature and high pressure gas is transformed into low-temp low-pressure liquid, emits heat simultaneously, and indoor temperature is improved.Then, carry out low-temp low-pressure liquid after the heat exchange through two logical stop valves 13 with environment, by the effect of capillary 12 (throttling boosting), its pressure is improved, in condenser 10 (heat and be evaporimeter in the process), be transformed into gas or gas-liquid mixture, the absorbing environmental heat under the control of cross valve 7, enters vapour liquid separator 2 simultaneously, this process circulates repeatedly, finishes the process of heating.Externally in the condenser 10 (heat in the process for evaporimeter), when low-temp low-pressure liquid is transformed into gas or gas-liquid mixture, the absorbing environmental heat, during low and high humidity, easily cause 10 frostings of external condensation device, make the reduction of off-premises station heat exchange efficiency when ambient temperature.
Fig. 2 is the vapour liquid separator structural representation of low-temperature heat pump air conditioner of the present invention.Referring to Fig. 2, the vapour liquid separator 2 of low-temperature heat pump air conditioner of the present invention, its heating tape, neighboring is divided into heating tape 17 and following heating tape 16, wherein goes up the middle part that heating tape 17 is looped around vapour liquid separator 2, and following heating tape 16 is looped around the bottom of vapour liquid separator 2.The outer peripheral edges of vapour liquid separator 2 are enclosed with adiabatic heat-insulation cotton 18.When on the external condensation device 10 during frosting, starting working in the heating tape 16 and 17 on the vapour liquid separator 2, improves the suction temperature of vapour-liquid condenser 2, and under the effect of adiabatic heat-insulation cotton 18, guarantee that the heat that the heating tape produces does not does not scatter and disappear.
Heating in the process of low-temperature heat pump air conditioner of the present invention, by detecting condenser coil temperature T g, outdoor environment temperature Th regulates the switch and the load of heating tape automatically by off-premises station computer plate.Condenser coil temperature T g and outdoor environment temperature Th detect by outer coil temperature sensor 8 and environment temperature sensor 9 respectively.Under heating mode, when Th≤2 ℃, and during Th-Tg＞1.5 ℃, open the heating tape of control vapour liquid separator 2, and during Th-Tg≤1.5 ℃, the heating tape of vapour liquid separator 2 is closed.Among the present invention, vapour liquid separator 2 adopts the control of two up and down heating tapes, wherein descends heating tape 16 power probably at 40W, and last heating tape 17 power are probably at 25W.In the running, carry out the control of heating tape according to the scope of Th-Tg, when 1.5≤Th-Tg≤5 ℃, only open and go up heating tape 17, when Th-Tg＞5 ℃, all open the heating tape up and down, when Th-Tg＜1.5 ℃, and heating tape Close All up and down.In a word, by to the switch and the load control of heating tape up and down, control metastable heat transfer temperature difference (1.5 ℃＜Th-Tg≤3 ℃), thereby realize under the low temperature environment, relative humidity is at 80% following condenser 10 frost-frees, the stable operation process that heats that air-conditioning remains.
Claims (7)
1. low-temperature heat pump air conditioner, it mainly comprises vapour liquid separator (2), compressor (4), evaporimeter
(14) and condenser (10), it is characterized in that also comprising:
One outer coil temperature sensor (8) is installed on the described condenser (10);
One environment temperature sensor (9) is installed near the inlet side fin of described condenser (10);
One heating tape, be arranged on the vapour liquid separator (2), described heating tape is made up of last heating tape (17) and following heating tape (16), and the outdoor environment temperature Th that detects according to described environment temperature sensor (9) opens or closes with the temperature range of the condenser coil temperature T g of outer coil temperature sensor (8) detection.
2. low-temperature heat pump air conditioner as claimed in claim 1 is characterized in that also comprising: a thermal insulating warm-keeping layer, it is wrapped in the skin of described vapour liquid separator (2).
3. low-temperature heat pump air conditioner as claimed in claim 2 is characterized in that: described thermal insulating warm-keeping layer is formed by adiabatic heat-insulation is cotton.
4. low-temperature heat pump air conditioner as claimed in claim 1 is characterized in that: the described power of going up heating tape (17) is 25w, and the described power of heating tape (16) down is 40w.
5. the automatic defrosting method of a low-temperature heat pump air conditioner, it is characterized in that: described low-temperature heat pump air conditioner is in the process of heating, by controlling described heating tape and providing thermal insulating warm-keeping layer for described vapour liquid separator (2), the method for cold-producing medium being carried out degree of superheat compensation realizes the non-frosting operation of condenser (10).
6. the automatic defrosting method of the low-temperature heat pump air conditioner described in claim 5, it is characterized in that: detect condenser coil temperature T g and the external environment temperature T h of environment temperature sensor (9) sensing chamber by outer coil temperature sensor (8), off-premises station computer buttress is regulated the switch and the load of heating tape automatically according to detected condenser coil temperature T g and outdoor environment temperature Th.
7. the automatic defrosting method of the low-temperature heat pump air conditioner described in claim 6, it is characterized in that: described off-premises station computer buttress according to switch and the load that detected condenser coil temperature T g and outdoor environment temperature Th regulate the heating tape automatically is: when 1.5 ℃≤Th-Tg≤5 ℃, off-premises station computer plate is only opened heating tape (17); When Th-Tg＞5 ℃, all open the heating tape up and down; When Th-Tg＜1.5 ℃, the heating tape Close All keeps relative stability heat transfer temperature difference up and down, and it is remained between 1.5 ℃ to 3 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100799034A CN100562697C (en) | 2005-06-27 | 2005-06-27 | Low-temperature heat pump air conditioner and automatic defrosting method thereof |
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| CNB2005100799034A CN100562697C (en) | 2005-06-27 | 2005-06-27 | Low-temperature heat pump air conditioner and automatic defrosting method thereof |
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| CN1888748A CN1888748A (en) | 2007-01-03 |
| CN100562697C true CN100562697C (en) | 2009-11-25 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009140584A2 (en) * | 2008-05-15 | 2009-11-19 | Xdx Innovative Refrigeration, Llc | Surged vapor compression heat transfer system with reduced defrost |
| CN105783348B (en) * | 2010-05-27 | 2019-05-17 | Xdx全球有限公司 | Method to the setting bypass of at least one phase separator to carry out heating operation |
| CN102147177A (en) * | 2011-04-12 | 2011-08-10 | 海信科龙电器股份有限公司 | Air conditioner for defrost and variable-frequency heat pump |
| CN102226610A (en) * | 2011-06-07 | 2011-10-26 | 龚光彩 | Preposed internal concurrent heating defrosting-preventing device |
| CN102767071B (en) * | 2012-06-27 | 2017-06-23 | 青岛海尔洗衣机有限公司 | The control method and heat pump clothes dryer of a kind of heat pump clothes dryer cooling fan |
| CN102997523B (en) * | 2012-12-14 | 2015-03-25 | 江苏苏净集团有限公司 | Gas-liquid separator adopted by carbon dioxide heat pump system |
| CN104329839B (en) * | 2013-07-22 | 2016-09-21 | 广东美的暖通设备有限公司 | Air conditioning system and low-temperature starting control method thereof |
| WO2017096595A1 (en) * | 2015-12-10 | 2017-06-15 | 暵旸绿能科技股份有限公司 | Heat pump system |
| CN108375252A (en) * | 2018-01-02 | 2018-08-07 | 珠海格力电器股份有限公司 | Liquid storage device assembly and its control method, air-conditioning system |
| CN110470008B (en) * | 2019-08-02 | 2022-03-29 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| WO2021218141A1 (en) * | 2020-04-27 | 2021-11-04 | 海信（广东）空调有限公司 | Air-conditioner outdoor unit |
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| CN1467462A (en) * | 2002-07-03 | 2004-01-14 | Lg电子株式会社 | Defrosting apparatus of air conditioner and method thereof |
| CN1523312A (en) * | 2003-01-13 | 2004-08-25 | Lg电子株式会社 | Multi-type air conditioner and method for controlling operation of the same |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6065299A (en) * | 1999-03-01 | 2000-05-23 | Yang Fan Development Co., Ltd. | Mechanism freeing an air conditioner from dripping |
| CN2472159Y (en) * | 2001-04-16 | 2002-01-16 | 广东科龙电器股份有限公司 | Hot Pump air conditioner with assisting defrosting and heating device |
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