CN100453928C - Automatic cascade refrigeration system exhaust pressure regulating device - Google Patents
Automatic cascade refrigeration system exhaust pressure regulating device Download PDFInfo
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- CN100453928C CN100453928C CNB2007100468609A CN200710046860A CN100453928C CN 100453928 C CN100453928 C CN 100453928C CN B2007100468609 A CNB2007100468609 A CN B2007100468609A CN 200710046860 A CN200710046860 A CN 200710046860A CN 100453928 C CN100453928 C CN 100453928C
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Abstract
The utility model relates to a controlling device used to regulate the discharge pressure of an automatic cascaded refrigeration system, wherein a buffer is positioned between the outlet of a compressor and the inlet of a condenser, the buffer vessel is connected with a by-pass valve, an expanding vessel and a capillary tube in sequence, and the capillary tube is connected with the return duct to form a by-pass branch; the upper outlet of each gas-liquid separator in the middle of and downstream the automatic cascaded system is connected with a pressure control valve, the press control valves are connected with each other in parallel and connected with the expanding vessel by the pipeline. The utility model redesigns the arrangement of the tube so that the low temperature refrigerator based on automatic cascaded circulation can reduce operation pressure and equalizing pressure effectively and protect the compressor and pipeline of the system well; meanwhile, the air branch designed at the upper part of the gas-liquid separator increases the cooling speed of the system and shortens the cooling time of the refrigerator considerably.
Description
Technical field
The present invention relates to a kind of adjusting device of automatic cascade refrigeration system exhaust pressure.
Background technology
Along with constantly popularizing of low temperature cabinet, the utilization field is more and more wider, and each producer wants that all continuous improvement by structure is to produce lower temperature.And the system that produces low temperature, ultralow temperature is based on automatic cascade.Along with the continuous increase of overlapping progression, the temperature that can produce is also just low more in theory.Progression for the automatic cascade system constantly increases, the kind that needs in the system to fill cold-producing medium also increases thereupon, the lower cold-producing medium of some boiling points particularly, and the total amount of cold-producing medium is also in continuous increase in the system, and this has just caused the operating pressure of system, equalizing pressure too high, when particularly just having started shooting, pressure at expulsion is very high, so not only compressor is caused damage, also born bigger pressure concerning refrigeration piping, the probability of pipe breakage increases.
Summary of the invention
The present invention proposes a kind of adjusting device of automatic cascade refrigeration system exhaust pressure, not only can overcome existing automatic cascade refrigeration system and exist the pressure at expulsion height, cause compressor damage easily, drawbacks such as refrigeration piping breaks, and the operating pressure of whole refrigeration system is reduced, and the system balancing pressure when shutting down reduces; The cooling rate of low-temp. refrigerator is promoted to some extent, shortened the time of refrigerator cooling greatly.
The technical scheme that the present invention solves its technical problem is:
The adjusting device of automatic cascade refrigeration system exhaust pressure, it is characterized in that: between exhaust outlet of compressor and condenser inlet, connect a buffer, buffer is connected with pressure by-passing valve, expansion vessel, capillary successively, capillary links to each other with the return line of system, forms a bypass branch road; In the upper gas exit of each gas-liquid separator of automatic cascade system postmedian, each connects a pressure-control valve, adopts between each pressure-control valve to be connected in parallel, and is connected with expansion vessel by pipeline.
The invention has the beneficial effects as follows: by buffer, the introducing of expansion vessel, when having improved compressor start, a large amount of gaseous refrigerants accumulate in the condenser, and build-up of pressure is too high, may cause the problem of pipeline and compressor damage; While is on the gas-liquid separator top of system, drawn the low-temperature refrigerant gas of partly separating by pipeline, connection with the pressure-control valve control piper, make the incoagulability refrigerant gas of these system's initial operating stages pass through the air return end of capillary connecting system, accelerated the cooling rate at system's initial stage.
Description of drawings
Fig. 1 is a structural representation of the present invention.
1. compressor, 2. buffer, 3. pressure by-passing valve, 4. expansion vessel, 5. capillary, 6. condenser, 7. gas-liquid separator, 8. pressure-control valve.
The specific embodiment
A kind of adjusting device of automatic cascade refrigeration system exhaust pressure, as shown in Figure 1.At first:
1. connect a buffer 2 between compressor 1 exhaust outlet and condenser 6 inlets, buffer is connected with pressure by-passing valve 3, expansion vessel 4, capillary 5 successively, and capillary links to each other with the return line of system, forms a bypass branch road.
The HTHP mix refrigerant gas that comes out from compressor 1 exhaust outlet, at first cushion by buffer 2, pressure at expulsion is decreased, if buffer is not set, constantly a large amount of working medium of discharging accumulate in the condenser 6 with the form of gaseous state, build-up of pressure is too high, and the high pressure that surpasses permissible value can damage diaphragm equally and cause the compressor paralysis.The mist that comes out from buffer, if the buffering after pressure still overpressure by-passing valve 3 set pressure the time, part gas can enter expansion vessel 4 by by-passing valve, links to each other with the return line of system through capillary 5, thereby reaches the too high purpose of further control pressure at expulsion.And the high temperature and high pressure gas of the overwhelming majority after condenser 6 condensations, enters system's postmedian.
2. in the upper gas exit of each gas-liquid separator 7 of automatic cascade system postmedian, each connects a pressure-control valve 8, forms the gas branch road, adopts between each pressure-control valve to be connected in parallel, and is connected with expansion vessel 4 by pipeline.
Each gas-liquid separator top at system's postmedian picks out a pipeline respectively, and isolated refrigerant gas is drawn, and links to each other with expansion vessel 4 by each pressure-control valve 8; Adopt in parallel between the pressure-control valve.Adopt such structure main cause to be: when machine just left, because high temperature refrigerant does not also have total condensation to become liquid, the cold that produces after the throttling was less, temperature in making, and low-temperature refrigerant can not be condensed at once.Therefore, the middle low-temperature refrigerant that is not condensed just becomes the incoagulable gas in the high temperature refrigerant on the one hand, causes the condensation rate of high temperature refrigerant slack-off, makes that initial stage system's cooling is slower; The refrigerant gas that is not cooled on the other hand is more, and in a period of time that machine brings into operation, the pressure of system maintains one all the time than higher scope, all is disadvantageous to compressor and pipeline.
After carrying out such system's improvement, when machine was just started shooting, when the low-temperature refrigerant gas pressure was higher than the pressure that pressure-control valve sets in uncooled, pressure-control valve 8 was opened, middle low-temperature refrigerant gas is admitted to expansion vessel 4, sends the air entry of compressor 1 after the throttling step-down back to.Can filter out a part of incoagulable gas of sneaking in the high temperature refrigerant so on the one hand, make high temperature refrigerant can be condensed into liquid rapidly, come condensation, also make the cooling rate of initial operating stage accelerate for middle low-temperature refrigerant provides enough colds; Because high temperature refrigerant is condensed into liquid faster, make system pressure descend faster on the other hand; Simultaneously; setting up of buffer 2 and expansion vessel 4; increased the volume of internal system; make when shutting down; though middle low-temperature refrigerant all exists with gas form; intrasystem pressure still can be alleviated preferably; also the startup to compressor 1 provides the certain protection effect; because equalizing pressure is high more; the meltage of refrigeration working medium in lubricating oil is big more, the instantaneous low-pressure area that becomes in chamber during compressor start, refrigeration working medium overflow the boiling that can cause that lubricating oil is violent suddenly; very likely be inhaled into compression chamber and cause " oil hits ", serious situation can be damaged diaphragm and cause the compressor cisco unity malfunction.
Claims (1)
1. the adjusting device of automatic cascade refrigeration system exhaust pressure, it is characterized in that: between exhaust outlet of compressor and condenser inlet, connect a buffer, buffer is connected with pressure by-passing valve, expansion vessel, capillary successively, capillary links to each other with the return line of system, forms a bypass branch road; In the upper gas exit of each gas-liquid separator of automatic cascade system postmedian, each connects a pressure-control valve, adopts between each pressure-control valve to be connected in parallel, and is connected with expansion vessel by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100468609A CN100453928C (en) | 2007-10-09 | 2007-10-09 | Automatic cascade refrigeration system exhaust pressure regulating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100468609A CN100453928C (en) | 2007-10-09 | 2007-10-09 | Automatic cascade refrigeration system exhaust pressure regulating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101126566A CN101126566A (en) | 2008-02-20 |
| CN100453928C true CN100453928C (en) | 2009-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100468609A Expired - Fee Related CN100453928C (en) | 2007-10-09 | 2007-10-09 | Automatic cascade refrigeration system exhaust pressure regulating device |
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| CN (1) | CN100453928C (en) |
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| CN104422209B (en) * | 2013-09-05 | 2016-08-10 | 珠海格力电器股份有限公司 | Air conditioning system |
| CN103727710B (en) * | 2013-12-26 | 2016-05-18 | 河南开祥精细化工有限公司 | Liquefied ammonia induction system, method and the ammonia refrigeration system of centrifugal ammonia compressor |
| CN104567125B (en) * | 2014-11-26 | 2017-08-22 | 青岛澳柯玛超低温冷冻设备有限公司 | A kind of bypass refrigeration heat-exchange system for unit auto-cascade refrigeration |
| PL3325899T3 (en) * | 2015-07-20 | 2022-11-28 | Cresstec Rac Ip Pty. Ltd. | A subsystem for a vapour-compression system |
| CN106969521A (en) * | 2017-04-08 | 2017-07-21 | 深圳高丽科学仪器有限公司 | Multiple working medium evaporation supercooling superpressure intelligence adjusts single compressor Auto-cascade cycle system |
| CN108704428A (en) * | 2018-06-11 | 2018-10-26 | 江苏同庆安全科技有限公司 | A kind of deduster with inerting function |
| CN108514797A (en) * | 2018-06-11 | 2018-09-11 | 江苏同庆安全科技有限公司 | A kind of deduster with explosion arrestment function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1208841A (en) * | 1997-08-20 | 1999-02-24 | 三菱电机株式会社 | Refrigerating and air-conditioning apparatus and method of determining refrigerant composition of refrigerating and air-conditioning apparatus |
| WO2002001121A1 (en) * | 2000-06-28 | 2002-01-03 | Igc Polycold Systems, Inc. | Mixed refrigerant temperature control using a pressure regulating valve |
| CN1135341C (en) * | 1994-05-30 | 2004-01-21 | 三菱电机株式会社 | Refrigerating circulating system and refrigerating air conditioning device |
| CN1677014A (en) * | 2005-04-27 | 2005-10-05 | 天津商学院 | Mixed working medium cascade refrigerating system |
| CN1732365A (en) * | 2002-11-11 | 2006-02-08 | 沃特克斯·埃尔康公司 | Refrigeration system with bypass subcooling and component size de-optimization |
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2007
- 2007-10-09 CN CNB2007100468609A patent/CN100453928C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1135341C (en) * | 1994-05-30 | 2004-01-21 | 三菱电机株式会社 | Refrigerating circulating system and refrigerating air conditioning device |
| CN1208841A (en) * | 1997-08-20 | 1999-02-24 | 三菱电机株式会社 | Refrigerating and air-conditioning apparatus and method of determining refrigerant composition of refrigerating and air-conditioning apparatus |
| WO2002001121A1 (en) * | 2000-06-28 | 2002-01-03 | Igc Polycold Systems, Inc. | Mixed refrigerant temperature control using a pressure regulating valve |
| CN1732365A (en) * | 2002-11-11 | 2006-02-08 | 沃特克斯·埃尔康公司 | Refrigeration system with bypass subcooling and component size de-optimization |
| CN1677014A (en) * | 2005-04-27 | 2005-10-05 | 天津商学院 | Mixed working medium cascade refrigerating system |
Non-Patent Citations (2)
| Title |
|---|
| 具有精馏装置的自动复叠制冷循环分析. 张绍志，王剑锋，张红线，陈光明.工程热物理学报，第22卷第1期. 2001 |
| 具有精馏装置的自动复叠制冷循环分析. 张绍志，王剑锋，张红线，陈光明.工程热物理学报，第22卷第1期. 2001 * |
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| Publication number | Publication date |
|---|---|
| CN101126566A (en) | 2008-02-20 |
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Granted publication date: 20090121 Termination date: 20121009 |