US5027606A
Expired / Lapsed
US
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Rotary displacement compression heat transfer systems incorporating highly fluorinated refrigerant-synthetic oil lubricant compositions
Assignee: CPI Engineering Services Inc
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Filing: 1989-10-20
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Granted: 1991-07-02
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Expires: 2009-10-20
Abstract
Abstract A rotary displacement compression heat transfer system and method for improving its efficiency includes a rotary displacement compressor for compressing a refrigerant, a condensor connected with the outlet of the compressor, an evaporator connected with the inlet of the compressor, an oil pump for injecting oil into the compressor, an oil separator for separating out the oil and recirculating it to the compressor, a non-chlorinated hydrocarbon refrigerant, and a synthetic oil ingredient in the oil providing an inverse solubility characteristic where a mixture of the refrigerant and oil has two immiscible phases in the compressor's operating temperature range and has only one dissolved liquid phase at a temperature in the evaporator's operating range at a weight concentration of oil less than about 5%.
Inventors
- 👤 Glenn D. Short
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:47
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C10; C10M; C10M171/00; C10M171/008; F; F25; F25B; F25B31/00; F25B31/002; C09K2205/00; C09K2205/24; F25B1/00; F25B1/04; F25B1/047
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
145 words
In a refrigeration or heat pump system including an oil-injected compressor for compressing a refrigerant, a refrigerant, a condenser in connection with the outlet of the compressor, a evaporator in connection with the inlet of the compressor, an oil, an oil injection means for injecting the oil into the compressor, an oil separator, and means for recirculating the separated oil to the oil injection means, the improvement wherein the refrigerant is a non-chlorinated hydrocarbon and the oil includes an oil ingredient proportion of such a synthetic type as to provide an inverse solubility characteristic that forms two insoluble phases in the compressor, one an oil-rich phase and the second a refrigerant-rich phase, whereas within a temperature range of -40° C. to +20° C. said mixture can form only one soluble phase in the evaporator at a weight concentration of oil to refrigerant less than 5%.
Claim 2
Dependent Claim
145 words
In a refrigeration or heat pump system including an oil-injected compressor for compressing a refrigerant, a refrigerant, a condenser in connection with the outlet of the compressor, a evaporator in connection with the inlet of the compressor, an oil, an oil injection means for injecting the oil into the compressor, an oil separator, and means for recirculating the separated oil to the oil injection means, the improvement wherein the refrigerant is a non-chlorinated hydrocarbon and the oil includes an oil ingredient proportion of such a synthetic type as to provide an inverse solubility characteristic that forms two insoluble phases in the compressor, one an oil-rich phase and the second a refrigerant-rich phase, whereas within a temperature range of -40° C. to +20° C. said mixture can form only one soluble phase in the evaporator at a weight concentration of oil to refrigerant less than 5%.
Claim 3
Dependent Claim
20 words
A system according to claim 1 wherein said refrigerant is polytetrafluoroethane, and said oil is a polyether polyol or monol.
Claim 4
Dependent Claim
74 words
A system according to claim 2 wherein said oil ingredient is a triol of the formula ##STR4## Z is the residue of an initiator compound having 3 to 8 active hydrogens, R 1 is hydrogen or methyl when R 2 is methyl, R 2 is hydrogen, methyl, or ethyl when R 1 is hydrogen, n is a number from 1 to 100, m is an integer having a value from 3 to about 8.
Claim 5
Dependent Claim
35 words
A system according to claim 1 wherein at 20 percent oil by weight of oil in the oil-refrigerant mixture in the compressor the oil and refrigerant form said two insoluble phases above about 140° F.
Claim 6
Dependent Claim
35 words
A system according to claim 1 wherein at 40 percent oil by weight of oil in the oil-refrigerant mixture in the compressor the oil and refrigerant form said two insoluble phases above about 140° F.
Claim 7
Dependent Claim
35 words
A system according to claim 1 wherein at 20 percent oil by weight of oil in the oil-refrigerant mixture in the compressor the oil and refrigerant form said two insoluble phases above about 120° F.
Claim 8
Dependent Claim
35 words
A system according to claim 1 wherein at 60 percent oil by weight of oil in the oil-refrigerant mixture in the compressor the oil and refrigerant form said two insoluble phases above about 140° F.
Claim 9
Dependent Claim
35 words
A system according to claim 1 wherein at 20 percent oil by weight of oil in the oil-refrigerant mixture in the compressor the oil and refrigerant form said two insoluble phases above about 60° F.
Claim 10
Dependent Claim
35 words
A system according to claim 1 wherein at 40 percent oil by weight of oil in the oil-refrigerant mixture in the compressor the oil and refrigerant form said two insoluble phases above about 120° F.
Claim 11
Dependent Claim
35 words
A system according to claim 1 wherein at 60 percent oil by weight of oil in the oil-refrigerant mixture in the compressor the oil and refrigerant form said two insoluble phases above about 100° F.
Claim 12
Dependent Claim
74 words
A system according to claim 1 wherein said oil ingredient is polyoxyalkylene glycol of the formula ##STR5## Z is the residue of an initiator compound having 1 to 8 active hydrogens, R 1 is hydrogen or methyl when R 2 is methyl, R 2 is hydrogen, methyl, or ethyl when R 1 is hydrogen, n is a number from 1 to 100, m is an integer having a value from 1 to about 8.
Claim 13
Dependent Claim
15 words
A system according to claim 1 wherein said lubricant ingredient is a polyoxyalkylene glycol homopolymer.
Claim 14
Dependent Claim
17 words
A system according to claim 1 wherein said lubricant ingredient is polyoxyalkylene glycol and comprises random copolymers.
Claim 15
Dependent Claim
17 words
A system according to claim 1 wherein said lubricant ingredient is polyoxyalkylene glycol and comprises block copolymers.
Claim 16
Dependent Claim
32 words
The system of claim 1 wherein said refrigerant is tetrafluoroethane and said oil is a polyoxyalkylene glycol and has a viscosity in said compressor in the range of at least 3 centistokes.
Claim 17
Dependent Claim
31 words
The system of claim 1 wherein said refrigerant is tetrafluoroethane and said oil is a polyoxyalkylene glycol and has a viscosity in said compressor in the range of about 6-10 centistokes.
Claim 18
Independent Claim
111 words
A method for improving the efficiency of a refrigeration or heat pump system in which a non-chlorinated, hydrocarbon refrigerant is compressed in a compressor, the outlet of the compressor is connected to a condenser, the inlet of the compressor is connected to an evaporator, the condenser communicates with the evaporator and oil is injected into the compressor through oil injection means, characterized in that a mixture of the refrigerant and oil forms two mutually insoluble phases in the compressor and has only one liquid phase in the evaporator at a temperature within the range of about -40° C. to +20° C. at a weight concentration of oil less than about 5%.
Claim 19
Independent Claim
111 words
A method for improving the efficiency of a refrigeration or heat pump system in which a non-chlorinated, hydrocarbon refrigerant is compressed in a compressor, the outlet of the compressor is connected to a condenser, the inlet of the compressor is connected to an evaporator, the condenser communicates with the evaporator and oil is injected into the compressor through oil injection means, characterized in that a mixture of the refrigerant and oil forms two mutually insoluble phases in the compressor and has only one liquid phase in the evaporator at a temperature within the range of about -40° C. to +20° C. at a weight concentration of oil less than about 5%.
Claim 20
Dependent Claim
12 words
A method according to claim 17 in which R-134a is the refrigerant.
Claim 21
Dependent Claim
14 words
A method according to claim 18 where said oil ingredient is a polyether triol.
Claim 22
Dependent Claim
12 words
A method according to claim 19 wherein said triol is glycerol initiated.
Claim 23
Dependent Claim
32 words
The system of claim 17 wherein said refrigerant is tetrafluoroethane and said oil is a polyoxyalkylene glycol and has a viscosity in said compressor in the range of at least 3 centistokes.
Claim 24
Dependent Claim
124 words
A closed refrigeration or heat pump system including a compressor for compressing a refrigerant, a non-chlorinated hydrocarbon refrigerant, a condenser in connection with the outlet of the compressor, an evaporator in connection with the inlet of the compressor, an oil, oil injection means for injecting oil into the compressor, an oil separator and means for recirculating separated oil to the oil injection means, characterized in that the oil and the refrigerant are such that a liquid mixture, incorporating the refrigerant and oil has two insoluble phases in the compressor at a weight concentration of oil above about 20% and has only one miscible phase at a temperature in the range of -40° to +20° C. at a weight concentration of oil less than 15%.
Claim 25
Dependent Claim
124 words
A closed refrigeration or heat pump system including a compressor for compressing a refrigerant, a non-chlorinated hydrocarbon refrigerant, a condenser in connection with the outlet of the compressor, an evaporator in connection with the inlet of the compressor, an oil, oil injection means for injecting oil into the compressor, an oil separator and means for recirculating separated oil to the oil injection means, characterized in that the oil and the refrigerant are such that a liquid mixture, incorporating the refrigerant and oil has two insoluble phases in the compressor at a weight concentration of oil above about 20% and has only one miscible phase at a temperature in the range of -40° to +20° C. at a weight concentration of oil less than 15%.
Claim 26
Independent Claim
119 words
A method for improving the efficiency of a refrigeration or heat pump system in which a non-chlorinated, hydrocarbon refrigerant is compressed in a compressor, the outlet of the compressor is connected to a condenser, the inlet of the compressor is connected to an evaporator, the condenser communicates with the evaporator and oil is injected into the compressor through oil injection means, characterized in that a mixture of the refrigerant and oil forms two mutually insoluble phases in the compressor at a weight concentration of oil above about 20% and has only one liquid phase in the evaporator at a temperature within the range of about -40° to +20° C. at a weight concentration of oil less than about 15%.
Claim 27
Independent Claim
119 words
A method for improving the efficiency of a refrigeration or heat pump system in which a non-chlorinated, hydrocarbon refrigerant is compressed in a compressor, the outlet of the compressor is connected to a condenser, the inlet of the compressor is connected to an evaporator, the condenser communicates with the evaporator and oil is injected into the compressor through oil injection means, characterized in that a mixture of the refrigerant and oil forms two mutually insoluble phases in the compressor at a weight concentration of oil above about 20% and has only one liquid phase in the evaporator at a temperature within the range of about -40° to +20° C. at a weight concentration of oil less than about 15%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |