CN103555279A - Refrigerant applicable to three-stage cascade refrigeration system using polyester oil for lubrication - Google Patents
Refrigerant applicable to three-stage cascade refrigeration system using polyester oil for lubrication Download PDFInfo
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- CN103555279A CN103555279A CN201310583881.XA CN201310583881A CN103555279A CN 103555279 A CN103555279 A CN 103555279A CN 201310583881 A CN201310583881 A CN 201310583881A CN 103555279 A CN103555279 A CN 103555279A
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Abstract
The invention discloses a refrigerant applicable to a three-stage cascade refrigeration system using polyester oil for lubrication. The refrigerant comprises a high-temperature-stage refrigeration unit, a medium-temperature-stage refrigeration unit and a low-temperature-stage refrigeration unit, wherein a mixture of pentafluoroethane/trifluoroethane/tetrafluoroethane is used as a refrigerant for the high-temperature-stage refrigeration unit; difluoromethane is used as a refrigerant for the medium-temperature-stage refrigeration unit; a mixture of carbon tetrafluoride and difluoromethane is used as a refrigerant for the low-temperature-stage refrigeration unit; the mass ratio of the carbon tetrafluoride to the difluoromethane is 20:1. The refrigerant has the advantages that the problems of blockage of a throttling device and instable work of a refrigeration system due to high probability of freezing of the polyester oil existing in the three-stage cascade refrigeration system using polyester oil for lubrication are solved, and meanwhile the ozone layer loss substances of the mixture of the carbon tetrafluoride and the difluoromethane are equal to zero so as to meet the environmental requirements.
Description
Technical field
The present invention relates to three grades of cascade refrigeration systems, especially relate to the refrigeration agent that is suitable for adopting three grades of lubricated cascade refrigeration systems of polyester oil.
Background technology
At present, in-120 ℃ of low-temperature refrigeration technologies, conventionally adopt three grades of cascade refrigeration systems.Three grades of cascade refrigeration system ultimate principles are to utilize high temperature level refrigeration unit, middle temperature level refrigeration unit and low temperature level refrigeration unit overlapping to make temperature reach-120 ℃.For meet the requirement of environmental protection, so high temperature level refrigeration unit adopts the mixture (R-404A) of pentafluoride ethane/Halothane/Tetrafluoroethane as refrigeration agent more, middle temperature level refrigeration unit adopts methylene fluoride (R-32) as refrigeration agent more, 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 are immiscible, this just causes under worst cold case polyester oil easy freezing when tetrafluoro-methane flows through throttling set, causes throttling set obstruction, refrigeration system poor work stability.
Summary of the invention
The object of the invention is to provide a kind of refrigeration agent that is suitable for adopting three grades of lubricated cascade refrigeration systems of polyester oil.
For achieving the above object, the present invention takes following technical proposals:
The refrigeration agent that is suitable for adopting three grades of lubricated cascade refrigeration systems of polyester oil of the present invention, comprises 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 have solved to adopt three grades of lubricated cascade refrigeration systems of polyester oil to have polyester oil easy freezing, cause the problem of throttling set obstruction, 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 lubricated cascade refrigeration system structural representations of employing polyester oil of the present invention.
Embodiment
As shown in Figure 1, the refrigeration agent that is suitable for adopting three grades of lubricated cascade refrigeration systems of polyester oil of the present invention, comprises 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. be suitable for adopting a refrigeration agent for three grades of lubricated cascade refrigeration systems of polyester oil, 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 true CN103555279A (en) | 2014-02-05 |
| CN103555279B 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112004907A (en) * | 2018-04-19 | 2020-11-27 | 大金工业株式会社 | Refrigerant-containing composition and use 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
- 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112004907A (en) * | 2018-04-19 | 2020-11-27 | 大金工业株式会社 | Refrigerant-containing composition and use thereof |
| CN112004907B (en) * | 2018-04-19 | 2022-03-29 | 大金工业株式会社 | Refrigerant-containing composition and use thereof |
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| Publication number | Publication date |
|---|---|
| CN103555279B (en) | 2015-12-09 |
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