CN102620494B - Control technology for superheat degree of automatic cascade refrigeration thermostatic expansion valve - Google Patents
Control technology for superheat degree of automatic cascade refrigeration thermostatic expansion valve Download PDFInfo
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- CN102620494B CN102620494B CN201210139620.4A CN201210139620A CN102620494B CN 102620494 B CN102620494 B CN 102620494B CN 201210139620 A CN201210139620 A CN 201210139620A CN 102620494 B CN102620494 B CN 102620494B
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Abstract
The invention discloses a control technology for superheat degree of an automatic cascade refrigeration thermostatic expansion valve, and belongs to the field of an automatic cascade refrigeration system. An air inlet of a compressor is connected with an evaporator and an evaporative condenser; an air outlet of the compressor is connected with a partial condenser; an outlet of the partial condenser is connected with a gas-liquid separator; a liquid outlet at the lower end of the gas-liquid separator is connected with a liquid inlet of the evaporative condenser through a throttle element; a liquid outlet of the evaporative condenser is connected to a liquid storage device liquid inlet of a liquid storage device; a liquid storage device liquid outlet of the liquid storage device is connected to the evaporator through a thermostatic expansion valve; an external balance pipe between the thermostatic expansion valve and an evaporator air outlet of the evaporator is connected with a pressure adjusting valve; a temperature sensing bag is arranged at the evaporator air outlet and is connected with the thermostatic expansion valve through a capillary pipe; and temperature variation at the evaporator air outlet is fed back to the thermostatic expansion valve by the temperature sensing bag to automatically adjust liquid supply. An external balance pipe path of an external balance thermostatic expansion valve is provided with a back pressure valve. Thus, actual control over the superheat degree of the thermostatic expansion valve is improved.
Description
Technical field
The control method that the present invention relates to the automatic cascade refrigeration heating power expansion valve degree of superheat, it belongs to automatic cascade formula field of refrigeration.
Background technology
In recent years, automatic cascade formula Refrigeration Technique has obtained the extensive approval of industry with its energy-saving and environmental protection, reliability high.The low-temperature refrigerant liquid of automatic cascade refrigeration wherein still contains a certain proportion of high-temperature component after purifying.Make the actual evaporation temperature of refrigerant liquid in evaporimeter high more a lot of than the saturated evaporating temperature of low temperature component, generally can reach 10-20 degree.While adopting heating power expansion valve feed flow, because the adjustable degree of superheat of heating power expansion valve has 2-8 degree.Cannot regulate when overheated greatlyr occurring, can make the liquid supply rate of evaporimeter roll up, there is no in a large number the refrigerant liquid outflow evaporimeters of evaporation, cause compressor to return liquid.Have a strong impact on refrigeration and compressor safety.
Summary of the invention
Defect in view of prior art exists, the object of the invention is to guarantee that the liquid supply rate of evaporimeter is normal, avoids the compressor in automatic cascade refrigeration system to return liquid phenomenon.By the method that adopts common external-balancing thermal expansion valve to add counterbalance valve, can carry out automatic control and adjustment to the liquid supply rate of evaporimeter.Reach and when low-temperature refrigerant dissolves in the high-temperature component of different proportion, can guarantee that the liquid supply rate of evaporimeter is normal.
For achieving the above object, the technology used in the present invention solution is the control method of the heating power expansion valve degree of superheat of automatic cascade refrigeration, and equipment comprises compressor, evaporimeter, evaporative condenser, segregator, gas-liquid separator, liquid reservoir, the air inlet of compressor is connected with evaporimeter and evaporative condenser, gas outlet and the segregator of compressor join, the outlet of segregator is connected with gas-liquid separator, gas-liquid separator lower end liquid outlet is connected by restricting element with evaporative condenser liquid inlet, the liquid outlet of evaporative condenser is connected in the liquid reservoir inlet of liquid reservoir, the liquid reservoir liquid outlet of liquid reservoir is connected in evaporimeter by heating power expansion valve, on outer balance pipe between the evaporimeter gas outlet of heating power expansion valve and evaporimeter, pressure-regulating valve is set, place, evaporimeter gas outlet is provided with temperature-sensitive bag, temperature-sensitive bag connects heating power expansion valve by capillary, temperature-sensitive bag feeds back to heating power expansion valve by place, evaporimeter gas outlet variations in temperature, automatically carry out liquid supply rate adjusting.Regulate pressure-regulating valve, the evaporimeter liquid supply rate when low-temperature refrigerant of controlling evaporator inlet place dissolves in the high-temperature component of different proportion, reaches and guarantees that the liquid supply rate of evaporimeter is normal.Described pressure-regulating valve is counterbalance valve.Described segregator is board-like, finned or bushing type.
Compared with prior art, the beneficial effect that the present invention has is: adopt and on the outer balance pipe path of external-balancing thermal expansion valve, install a counterbalance valve.The working control degree of superheat of heating power expansion valve is improved.The back pressure of counterbalance valve can regulate according to actual conditions.Reach and when low-temperature refrigerant dissolves in the high-temperature component of different proportion, can guarantee that the liquid supply rate of evaporimeter is normal.Guaranteed the work of system high efficiency rate, and the safety of compressor.
Accompanying drawing explanation
Fig. 1 is the structure diagram of the control method of the automatic cascade refrigeration heating power expansion valve degree of superheat.
In figure: 1, compressor, 2, evaporimeter, 3, evaporative condenser, 4, segregator, 5, gas-liquid separator, 6, restricting element, 7, liquid reservoir, 8, heating power expansion valve, 9, pressure-regulating valve, 10, liquid reservoir inlet, 11, liquid reservoir liquid outlet, 12, temperature-sensitive bag, 13, evaporimeter gas outlet, 14, outer balance pipe.
The specific embodiment
The control method of the heating power expansion valve degree of superheat of automatic cascade refrigeration, equipment comprises compressor 1, evaporimeter 2, evaporative condenser 3, segregator 4, gas-liquid separator 5, liquid reservoir 7, the air inlet of compressor 1 is connected with evaporimeter 2 and evaporative condenser 3, the gas outlet of compressor 1 and segregator 4 join, the outlet of segregator 4 is connected with gas-liquid separator 5, gas-liquid separator 5 lower end liquid outlets are connected by restricting element 6 with evaporative condenser 3 liquid inlets, the liquid outlet of evaporative condenser 3 is connected in the liquid reservoir inlet 10 of liquid reservoir 7, the liquid reservoir liquid outlet 11 of liquid reservoir 7 is connected in evaporimeter by heating power expansion valve 8, outer balance pipe 14 between the evaporimeter gas outlet 13 of heating power expansion valve 8 and evaporimeter 2 is connected with pressure-regulating valve 9, place, evaporimeter gas outlet is provided with temperature-sensitive bag 12, temperature-sensitive bag 12 connects heating power expansion valve 8 by capillary, temperature-sensitive bag 12 feeds back to heating power expansion valve 8 by evaporimeter gas outlet 13 place's variations in temperature, automatically carry out liquid supply rate adjusting.Regulate pressure-regulating valve 9, reach and when low-temperature refrigerant dissolves in the high-temperature component of different proportion, can guarantee that the liquid supply rate of evaporimeter 2 is normal.Described pressure-regulating valve 9 is counterbalance valve.Described segregator 4 is board-like, finned or bushing type.
Automatic cascade refrigeration system needs one or several single-stage compressor work, in system, be filled with two kinds of cold-producing medium work that boiling point is different simultaneously, compressor 1 exhaust enters segregator 4, segregator 4 is board-like, obtain liquid higher boiling cold-producing medium and incondensible low boiling point refrigerant gas that purity is higher, the two enters together in gas-liquid separator 5 and carries out gas-liquid separation.Higher boiling cold-producing medium enters evaporative condenser 3 through restricting element 6 throttlings, and sweat cooling makes the liquid that congeals into of the low boiling point refrigerant gas cold by gas-liquid separator 5, and low-boiling point liquid flows into liquid reservoir 7, through heating power expansion valve 8, enters evaporimeter 2 sweat coolings.The liquid supply rate adjustment of heating power expansion valve 8 is to regulate according to the evaporating pressure of experiencing.Than the high 2-8 degree of corresponding evaporating temperature under saturation pressure.When cold-producing medium dissolves in part high-temperature component, actual saturation temperature is raise, heating power expansion valve 8 still adds a control degree of superheat according to the saturation temperature of original low-temperature refrigerant and controls valve port opening, causes feed fluid excessive.By regulating counterbalance valve that the pressure of heating power expansion valve 8 impressions is improved, the also corresponding raising of the control degree of superheat of heating power expansion valve 8, just can carry out liquid supply rate adjusting automatically according to effective supply liquid situation.The front and back pressure differential of counterbalance valve can manual adjustment, makes the liquid supply rate of heating power expansion valve 8 normal, avoids not have in a large number the refrigerant liquid outflow evaporimeters 2 of evaporation, the phenomenon of effectively having prevented 1 time liquid of compressor.
Claims (3)
1. the control method of the heating power expansion valve degree of superheat of automatic cascade refrigeration, is characterized in that: equipment comprises compressor (1), evaporimeter (2), evaporative condenser (3), segregator (4), gas-liquid separator (5), liquid reservoir (7), the air inlet of compressor (1) is connected with evaporimeter (2) and evaporative condenser (3), the gas outlet of compressor (1) and segregator (4) join, the outlet of segregator (4) is connected with gas-liquid separator (5), gas-liquid separator (5) lower end liquid outlet is connected by restricting element (6) with evaporative condenser (3) liquid inlet, the liquid outlet of evaporative condenser (3) is connected in the liquid reservoir inlet (10) of liquid reservoir (7), the liquid reservoir liquid outlet (11) of liquid reservoir (7) is connected in evaporimeter by heating power expansion valve (8), on outer balance pipe (14) between the evaporimeter gas outlet (13) of heating power expansion valve (8) and evaporimeter (2), pressure-regulating valve (9) is set, place, evaporimeter gas outlet is provided with temperature-sensitive bag (12), temperature-sensitive bag (12) connects heating power expansion valve (8) by capillary, temperature-sensitive bag (12) is located variations in temperature by evaporimeter gas outlet (13) and is fed back to heating power expansion valve (8), automatically carry out liquid supply rate adjusting, regulate pressure-regulating valve (9), evaporimeter (2) liquid supply rate when low-temperature refrigerant of controlling evaporimeter (2) porch dissolves in the high-temperature component of different proportion.
2. the control method of the heating power expansion valve degree of superheat of automatic cascade refrigeration according to claim 1, is characterized in that: described pressure-regulating valve (9) is counterbalance valve.
3. the control method of the heating power expansion valve degree of superheat of automatic cascade refrigeration according to claim 1, is characterized in that: described segregator (4) is board-like, finned or bushing type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210139620.4A CN102620494B (en) | 2012-05-08 | 2012-05-08 | Control technology for superheat degree of automatic cascade refrigeration thermostatic expansion valve |
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| CN201210139620.4A CN102620494B (en) | 2012-05-08 | 2012-05-08 | Control technology for superheat degree of automatic cascade refrigeration thermostatic expansion valve |
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| CN102620494A CN102620494A (en) | 2012-08-01 |
| CN102620494B true CN102620494B (en) | 2014-03-12 |
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| CN105757853A (en) * | 2016-04-05 | 2016-07-13 | 佛山市澳霆环境设备制造有限公司 | Heating, cooling and dehumidification integrated dehumidification loop and heating, cooling and dehumidification integrated dehumidifier adopting same |
| CN108800685A (en) * | 2018-08-22 | 2018-11-13 | 安徽美乐柯制冷空调设备有限公司 | A kind of handpiece Water Chilling Units equipped with subcooler and lube oil cooler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1621758A (en) * | 2003-11-26 | 2005-06-01 | 日立空调系统株式会社 | Air conditioner |
| CN101038097A (en) * | 2006-03-15 | 2007-09-19 | 海尔集团公司 | Refrigerating system of air-conditioning and method for controlling flow of refrigerant |
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| JP4243211B2 (en) * | 2004-04-06 | 2009-03-25 | 株式会社テージーケー | Refrigeration system |
| KR100758902B1 (en) * | 2004-11-23 | 2007-09-14 | 엘지전자 주식회사 | multi type air conditioning system and controlling method of the system |
| US20060254308A1 (en) * | 2005-05-16 | 2006-11-16 | Denso Corporation | Ejector cycle device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1621758A (en) * | 2003-11-26 | 2005-06-01 | 日立空调系统株式会社 | Air conditioner |
| CN101038097A (en) * | 2006-03-15 | 2007-09-19 | 海尔集团公司 | Refrigerating system of air-conditioning and method for controlling flow of refrigerant |
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