CN103555279B - Adopt three grades of cascade refrigeration systems of polyester oil lubrication - Google Patents
Adopt three grades of cascade refrigeration systems of polyester oil lubrication Download PDFInfo
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- CN103555279B CN103555279B CN201310583881.XA CN201310583881A CN103555279B CN 103555279 B CN103555279 B CN 103555279B CN 201310583881 A CN201310583881 A CN 201310583881A CN 103555279 B CN103555279 B CN 103555279B
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Abstract
The invention discloses a kind of three grades of cascade refrigeration systems adopting polyester oil to lubricate, comprise high-temperature level refrigeration unit, middle temperature level refrigeration unit, low-temperature level refrigeration unit; Described high-temperature level refrigeration unit adopts the mixture of pentafluoride ethane/Halothane/Tetrafluoroethane as refrigeration agent; Described middle temperature level refrigeration unit adopts methylene fluoride as refrigeration agent; Described low-temperature level refrigeration unit adopts the mixture of tetrafluoro-methane and methylene fluoride as refrigeration agent, and the mass ratio of described tetrafluoro-methane and methylene fluoride is 20:1.The invention has the advantages that to solve adopts three grades of cascade refrigeration systems of polyester oil lubrication to there is polyester oil easy freezing, causes the problem of throttling set blocking, refrigeration system job insecurity.Meanwhile, the mixture ozone-depleting substances of tetrafluoro-methane and methylene fluoride equal zero, and meet environmental requirement.
Description
Technical field
The present invention relates to three grades of cascade refrigeration systems, especially relate to the three grades of cascade refrigeration systems adopting polyester oil lubrication.
Background technology
At present, in-120 DEG C of low-temperature refrigeration technologies, usually adopt three grades of cascade refrigeration systems.Three grades of cascade refrigeration system ultimate principles utilize high-temperature level refrigeration unit, middle temperature level refrigeration unit and low-temperature level refrigeration unit overlapping to reach-120 DEG C to make temperature.In order to meet the requirement of environmental protection, so the mixture (R-404A) of high-temperature level refrigeration unit many employings pentafluoride ethane/Halothane/Tetrafluoroethane is as refrigeration agent, middle temperature level refrigeration unit many employings methylene fluoride (R-32) is as refrigeration agent, and low-temperature level refrigeration unit generally adopts tetrafluoro-methane (R-14) as refrigeration agent.But, when low-temperature level refrigeration unit adopts tetrafluoro-methane as refrigeration agent, tetrafluoro-methane and polyester oil immiscible, when this just causes tetrafluoro-methane under worst cold case to flow through throttling set, polyester oil easy freezing, causes throttling set to block, refrigeration system poor work stability.
Summary of the invention
The object of the invention is to provide a kind of three grades of cascade refrigeration systems adopting polyester oil to lubricate.
For achieving the above object, the present invention takes following technical proposals:
Three grades of cascade refrigeration systems of employing polyester oil lubrication of the present invention, comprise high-temperature level refrigeration unit, middle temperature level refrigeration unit, low-temperature level refrigeration unit; Described high-temperature level refrigeration unit adopts the mixture of pentafluoride ethane/Halothane/Tetrafluoroethane as refrigeration agent; Described middle temperature level refrigeration unit adopts methylene fluoride as refrigeration agent; Described low-temperature level refrigeration unit adopts the mixture of tetrafluoro-methane and methylene fluoride as refrigeration agent, and the mass ratio of described tetrafluoro-methane and methylene fluoride is 20:1.
The invention has the advantages that to solve adopts three grades of cascade refrigeration systems of polyester oil lubrication to there is polyester oil easy freezing, causes the problem of throttling set blocking, refrigeration system job insecurity.Meanwhile, the mixture ozone-depleting substances of tetrafluoro-methane and methylene fluoride equal zero, and meet environmental requirement.
Accompanying drawing explanation
Fig. 1 is three grades of cascade refrigeration system structural representations of employing polyester oil of the present invention lubrication.
Embodiment
As shown in Figure 1, three grades of cascade refrigeration systems of employing polyester oil lubrication of the present invention, comprise high-temperature level refrigeration unit 1, middle temperature level refrigeration unit 2, low-temperature level refrigeration unit 3; Described high-temperature level refrigeration unit 1 adopts the mixture of pentafluoride ethane/Halothane/Tetrafluoroethane as refrigeration agent; Described middle temperature level refrigeration unit 2 adopts methylene fluoride as refrigeration agent; Described low-temperature level refrigeration unit 3 adopts the mixture of tetrafluoro-methane and methylene fluoride as refrigeration agent, and the mass ratio of described tetrafluoro-methane and methylene fluoride is 20:1.
Claims (1)
1. the three grades of cascade refrigeration systems adopting polyester oil to lubricate, comprise high-temperature level refrigeration unit (1), middle temperature level refrigeration unit (2), low-temperature level refrigeration unit (3); Described high-temperature level refrigeration unit (1) adopts the mixture of pentafluoride ethane/Halothane/Tetrafluoroethane as refrigeration agent; Described middle temperature level refrigeration unit (2) adopts methylene fluoride as refrigeration agent; It is characterized in that: described low-temperature level refrigeration unit (3) adopts the mixture of tetrafluoro-methane and methylene fluoride as refrigeration agent, and the mass ratio of described tetrafluoro-methane and methylene fluoride is 20:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310583881.XA CN103555279B (en) | 2013-11-20 | 2013-11-20 | Adopt three grades of cascade refrigeration systems of polyester oil lubrication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310583881.XA CN103555279B (en) | 2013-11-20 | 2013-11-20 | Adopt three grades of cascade refrigeration systems of polyester oil lubrication |
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| Publication Number | Publication Date |
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| CN103555279A CN103555279A (en) | 2014-02-05 |
| CN103555279B true CN103555279B (en) | 2015-12-09 |
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| CN201310583881.XA Active CN103555279B (en) | 2013-11-20 | 2013-11-20 | Adopt three grades of cascade refrigeration systems of polyester oil lubrication |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6693589B2 (en) * | 2018-04-19 | 2020-05-13 | ダイキン工業株式会社 | Composition containing refrigerant and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101225292A (en) * | 2007-12-29 | 2008-07-23 | 龙志刚 | Mixed refrigerant adapted for refrigerating temperature range of minus 105 degree centigrade to minus 125 degree centigrade |
| CN103335491A (en) * | 2013-07-18 | 2013-10-02 | 上海千山远东制药机械有限公司 | Low-temperature vacuum freeze drier |
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- 2013-11-20 CN CN201310583881.XA patent/CN103555279B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101225292A (en) * | 2007-12-29 | 2008-07-23 | 龙志刚 | Mixed refrigerant adapted for refrigerating temperature range of minus 105 degree centigrade to minus 125 degree centigrade |
| CN103335491A (en) * | 2013-07-18 | 2013-10-02 | 上海千山远东制药机械有限公司 | Low-temperature vacuum freeze drier |
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| CN103555279A (en) | 2014-02-05 |
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