CN102620494A - 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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- CN102620494A CN102620494A CN2012101396204A CN201210139620A CN102620494A CN 102620494 A CN102620494 A CN 102620494A CN 2012101396204 A CN2012101396204 A CN 2012101396204A CN 201210139620 A CN201210139620 A CN 201210139620A CN 102620494 A CN102620494 A CN 102620494A
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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 present invention relates to the control technology of 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 characteristics such as its energy-saving and environmental protection, reliability height.The low-temperature refrigerant liquid of automatic cascade refrigeration wherein still contains a certain proportion of high-temperature component after purifying.Make the actual evaporating temperature of refrigerant liquid in evaporimeter high more a lot, generally can reach the 10-20 degree than the saturated evaporating temperature of low temperature component.When adopting the heating power expansion valve feed flow, because the adjustable degree of superheat of heating power expansion valve has the 2-8 degree.Can't regulate when overheated greatlyyer taking place, the liquid supply rate of evaporimeter is rolled up, not have the refrigerant liquids outflow evaporimeters of evaporation in a large number, cause compressor to return liquid.Have a strong impact on refrigeration and compressor safety.
Summary of the invention
Defective in view of prior art exists the objective of the invention is to guarantee that the liquid supply rate of evaporimeter is normal, avoids the compressor in the automatic cascade refrigeration system to return the liquid phenomenon.Method through adopting common external-balancing thermal expansion valve to add counterbalance valve can be carried out automatic control and adjustment to the liquid supply rate of evaporimeter.It is normal to reach the liquid supply rate that when low-temperature refrigerant dissolves in the high-temperature component of different proportion, can both guarantee evaporimeter.
For realizing above-mentioned purpose, the technical solution that the present invention adopted is the control technology 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 links to each other with evaporimeter and evaporative condenser; The gas outlet and the segregator of compressor join; The outlet of segregator links to each other with gas-liquid separator, and gas-liquid separator lower end liquid outlet links to each other through restricting element with the evaporative condenser liquid inlet, and 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 through heating power expansion valve; Outer balance pipe between the evaporimeter gas outlet of heating power expansion valve and evaporimeter is connected with pressure-regulating valve, and place, evaporimeter gas outlet is provided with bulb, and bulb connects heating power expansion valve through capillary; Bulb feeds back to heating power expansion valve with place, evaporimeter gas outlet variations in temperature, carries out liquid supply rate automatically and regulates.Regulate pressure-regulating valve, evaporimeter liquid supply rate when the control low-temperature refrigerant dissolves in the high-temperature component of different proportion, it is normal to reach the liquid supply rate that guarantees evaporimeter.Said pressure-regulating valve is a counterbalance valve.Described segregator is board-like, finned or bushing type.
Compared with prior art, the beneficial effect that the present invention had is: be employed in counterbalance valve of installing on the outer balance pipe path of external-balancing thermal expansion valve.The working control degree of superheat of heating power expansion valve is improved.The back pressure of counterbalance valve can be regulated according to actual conditions.It is normal to reach the liquid supply rate that when low-temperature refrigerant dissolves in the high-temperature component of different proportion, can both guarantee evaporimeter.Guaranteed the safety of work of system high efficiency rate and compressor.
Description of drawings
Fig. 1 is the structure diagram of the control technology of the automatic cascade refrigeration heating power expansion valve degree of superheat.
Among the 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, the liquid reservoir inlet, 11, the liquid reservoir liquid outlet; 12, bulb, 13, the evaporimeter gas outlet, 14, outer balance pipe.
The specific embodiment
The control technology 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 links to each other with evaporimeter 2 and evaporative condenser 3; The gas outlet of compressor 1 and segregator 4 join; The outlet of segregator 4 links to each other with gas-liquid separator 5, and gas-liquid separator 5 lower end liquid outlets link to each other through restricting element 6 with evaporative condenser 3 liquid inlets, and 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 through 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, and place, evaporimeter gas outlet is provided with bulb 12, and bulb 12 connects heating power expansion valve 8 through capillary; Bulb 12 feeds back to heating power expansion valve 8 with evaporimeter gas outlet 13 place's variations in temperature, carries out liquid supply rate automatically and regulates.Regulate pressure-regulating valve 9, it is normal to reach the liquid supply rate that when low-temperature refrigerant dissolves in the high-temperature component of different proportion, can both guarantee evaporimeter 2.Described pressure-regulating valve 9 is a counterbalance valve.Described segregator 4 is board-like, finned or bushing type.
Automatic cascade refrigeration system needs one or several single-stage compressor work; Charge into the work of two kinds of boiling point different refrigerants in the system simultaneously; Compressor 1 exhaust gets into segregator 4; Segregator 4 is board-like, obtains higher liquid higher boiling cold-producing medium of purity and incondensible low boiling point refrigerant gas, and the two gets in the gas-liquid separator 5 together and carries out gas-liquid separation.The higher boiling cold-producing medium gets into evaporative condenser 3 through restricting element 6 throttlings, and sweat cooling makes the low boiling point refrigerant condensation of gas by gas-liquid separator 5 become liquid, and low-boiling point liquid flows into liquid reservoir 7, gets into evaporimeter 2 sweat coolings through heating power expansion valve 8.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 pairing evaporating temperature under the saturation pressure.When cold-producing medium dissolves in the 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.Through regulating counterbalance valve 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 be carried out liquid supply rate automatically according to effective supply liquid situation and regulate.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 liquids outflow evaporimeters 2 of evaporation, the phenomenon of effectively having prevented 1 time liquid of compressor.
Claims (3)
1. the control technology of the heating power expansion valve degree of superheat of automatic cascade refrigeration, it 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) links to each other with evaporimeter (2) and evaporative condenser (3); The gas outlet of compressor (1) and segregator (4) join; The outlet of segregator (4) links to each other with gas-liquid separator (5); Gas-liquid separator (5) lower end liquid outlet links to each other through 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), and the liquid reservoir liquid outlet (11) of liquid reservoir (7) is connected in evaporimeter through heating power expansion valve (8), and the 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 bulb (12); Bulb (12) connects heating power expansion valve (8) through capillary, and bulb (12) is located variations in temperature with evaporimeter gas outlet (13) and fed back to heating power expansion valve (8), carries out liquid supply rate automatically and regulates; Regulate pressure-regulating valve (9), evaporimeter (2) liquid supply rate when the control low-temperature refrigerant dissolves in the high-temperature component of different proportion.
2. the control technology of the heating power expansion valve degree of superheat of automatic cascade refrigeration according to claim 1, it is characterized in that: said pressure-regulating valve (9) is a counterbalance valve.
3. the control technology of the heating power expansion valve degree of superheat of automatic cascade refrigeration according to claim 1 is characterized in that: said 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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| 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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| CN102620494A true CN102620494A (en) | 2012-08-01 |
| CN102620494B CN102620494B (en) | 2014-03-12 |
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| CN201210139620.4A Expired - Fee Related CN102620494B (en) | 2012-05-08 | 2012-05-08 | Control technology for superheat degree of automatic cascade refrigeration thermostatic expansion valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN1621758A (en) * | 2003-11-26 | 2005-06-01 | 日立空调系统株式会社 | Air conditioner |
| US20050217313A1 (en) * | 2004-04-06 | 2005-10-06 | Tgk Co., Ltd. | Refrigeration system |
| US20060107683A1 (en) * | 2004-11-23 | 2006-05-25 | Lg Electronics Inc. | Air conditioning system and method for controlling the same |
| US20060254308A1 (en) * | 2005-05-16 | 2006-11-16 | Denso Corporation | Ejector cycle device |
| 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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2012
- 2012-05-08 CN CN201210139620.4A patent/CN102620494B/en not_active Expired - Fee Related
Patent Citations (5)
| 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 |
| US20050217313A1 (en) * | 2004-04-06 | 2005-10-06 | Tgk Co., Ltd. | Refrigeration system |
| US20060107683A1 (en) * | 2004-11-23 | 2006-05-25 | Lg Electronics Inc. | Air conditioning system and method for controlling the same |
| US20060254308A1 (en) * | 2005-05-16 | 2006-11-16 | Denso Corporation | Ejector cycle device |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN102620494B (en) | 2014-03-12 |
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Granted publication date: 20140312 Termination date: 20180508 |