Patent US5947710A successfully refreshed from Google Patents.
US5947710A
Expired / Lapsed
US
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Rotary compressor with reduced lubrication sensitivity
Assignee: Carrier Corp
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Filing: 1997-06-16
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Granted: 1999-09-07
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Expires: 2017-06-16
Abstract
Abstract Lubrication deficiencies related to the use of lubricants in HFC refrigeration compressors can be mitigated by providing a diamond-like-carbon coating on a member subject to wear due to lubrication deficiencies. Specifically, the tip of the vane of a rotary compressor is coated with a diamond-like-carbon coating made up of alternating layers of tungsten carbide and a lubricious material 0.5 to 5.0 microns thick.
Inventors
- 👤 Clark V. Cooper
- 👤 Paul J. Bushnell
- 👤 Martin M. Mertell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:16
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/02; F04C18/00; F04C18/30; F04C18/34; F04C18/356; F04C18/3562; F04C18/3564; F01; F01C; F01C21/00; F01C21/08; F01C21/0809; F04C23/00; F04C23/008; F04C2210/00; F04C2210/26; F04C2230/00; F04C2230/90; F04C2230/91; F05; F05C; F05C2203/00; F05C2203/08; F05C2203/0804; F05C2203/0808; F05C2203/0813; F05C2253/00; F05C2253/08; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12625; Y10T428/30
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
97 words
An improved rotary compressor for compressing HFC refrigerant which is lubricated by a synthetic lubricant, said rotary compressor having pump means including a piston rollably disposed within a bore of a cylinder and a vane having a tip coacting with said piston, the improvement comprising: said tip having a diamond-like-carbon coating thereon made up of a series of alternating hard and lubricious layers whereby the coefficient of friction between said tip and said piston is reduced and said tip has reduced wear even in the absence of sufficient lubricant as compared to a tip without said diamond-like-coating.
Claim 2
Dependent Claim
97 words
An improved rotary compressor for compressing HFC refrigerant which is lubricated by a synthetic lubricant, said rotary compressor having pump means including a piston rollably disposed within a bore of a cylinder and a vane having a tip coacting with said piston, the improvement comprising: said tip having a diamond-like-carbon coating thereon made up of a series of alternating hard and lubricious layers whereby the coefficient of friction between said tip and said piston is reduced and said tip has reduced wear even in the absence of sufficient lubricant as compared to a tip without said diamond-like-coating.
Claim 3
Dependent Claim
283 words
A high side rotary compressor for compressing HFC refrigerant which is lubricated by a lubricant selected from the group consisting of mineral oils, alkylbenzene, polyvinyl ether and polycarbonate lubricants comprising: shell means having a first end and a second end; cylinder means containing pump means including a vane and a piston coacting with said cylinder means to define suction and compression chambers; said cylinder means being fixedly located in said shell means near said first end and defining with said first end a first chamber which has an oil sump containing said oil lubricant; first bearing means secured to said cylinder means and extending towards said oil sump; second bearing means secured to said cylinder means and extending towards said second end; motor means including rotor means and stator means; said stator means fixedly located in said shell means between said cylinder means and said second end and axially spaced from said cylinder means and said second bearing means; eccentric shaft means supported by said first and second bearing means and including eccentric means operatively connected to said piston; said rotor means secured to said shaft means so as to be integral therewith and located within said stator so as to define therewith an annular gap; suction means for supplying gas to said pump means; discharge means fluidly connected to said shell means; said vane having a tip coacting with said piston; said tip having a diamond-like-carbon coating thereon made up of a series of alternating hard and lubricious layers whereby the coefficient of friction between said tip and piston is reduced and said tip has reduced wear even in the absence of sufficient lubricant as compared to a tip without said diamond-like-coating.
Claim 4
Dependent Claim
283 words
A high side rotary compressor for compressing HFC refrigerant which is lubricated by a lubricant selected from the group consisting of mineral oils, alkylbenzene, polyvinyl ether and polycarbonate lubricants comprising: shell means having a first end and a second end; cylinder means containing pump means including a vane and a piston coacting with said cylinder means to define suction and compression chambers; said cylinder means being fixedly located in said shell means near said first end and defining with said first end a first chamber which has an oil sump containing said oil lubricant; first bearing means secured to said cylinder means and extending towards said oil sump; second bearing means secured to said cylinder means and extending towards said second end; motor means including rotor means and stator means; said stator means fixedly located in said shell means between said cylinder means and said second end and axially spaced from said cylinder means and said second bearing means; eccentric shaft means supported by said first and second bearing means and including eccentric means operatively connected to said piston; said rotor means secured to said shaft means so as to be integral therewith and located within said stator so as to define therewith an annular gap; suction means for supplying gas to said pump means; discharge means fluidly connected to said shell means; said vane having a tip coacting with said piston; said tip having a diamond-like-carbon coating thereon made up of a series of alternating hard and lubricious layers whereby the coefficient of friction between said tip and piston is reduced and said tip has reduced wear even in the absence of sufficient lubricant as compared to a tip without said diamond-like-coating.
Claim 5
Dependent Claim
12 words
The compressor of claim 2 wherein said oil sump contains said lubricant.
Claim 6
Dependent Claim
14 words
The compressor of claim 2 wherein said coating is 0.5 to 5.0 μm thick.
Claim 7
Dependent Claim
21 words
The compressor of claim 4 wherein said series is made up of a plurality of bilayers 1 to 20 nm thick.
Claim 8
Dependent Claim
21 words
The compressor of claim 2 wherein said series is made up of a plurality of bilayers 1 to 20 nm thick.
Claim 9
Dependent Claim
12 words
The compressor of claim 2 wherein said lubricious layers are amorphous carbon.
Claim 10
Dependent Claim
19 words
The compressor of claim 7 wherein said hard layers are an amorphous assemblage of carbon and a transition metal.
Claim 11
Dependent Claim
19 words
The compressor of claim 7 wherein said hard materials are an amorphous assemblage of carbon and a transition metal.
Claim 12
Dependent Claim
270 words
A high side rotary compressor for compressing HFC refrigerant which is lubricated by a synthetic lubricant comprising: shell means having a first end and a second end; cylinder means containing pump means including a vane and a piston coacting with said cylinder means to define suction and compression chambers; said cylinder means being fixedly located in said shell means near said first end and defining with said first end a first chamber which has an oil sump containing said oil lubricant; first bearing means secured to said cylinder means and extending towards said oil sump; second bearing means secured to said cylinder means and extending towards said second end; motor means including rotor means and stator means; said stator means fixedly located in said shell means between said cylinder means and said second end and axially spaced from said cylinder means and said second bearing means; eccentric shaft means supported by said first and second bearing means and including eccentric means operatively connected to said piston; said rotor means secured to said shaft means so as to be integral therewith and located within said stator so as to define therewith an annular gap; suction means for supplying gas to said pump means; discharge means fluidly connected to said shell means; said vane having a tip coacting with said piston; said tip having a diamond-like-carbon coating thereon made up of a series of alternating hard and lubricious layers whereby the coefficient of friction between said tip and piston is reduced and said tip has reduced wear even in the absence of sufficient lubricant as compared to a tip without said diamond-like-coating.
Claim 13
Dependent Claim
270 words
A high side rotary compressor for compressing HFC refrigerant which is lubricated by a synthetic lubricant comprising: shell means having a first end and a second end; cylinder means containing pump means including a vane and a piston coacting with said cylinder means to define suction and compression chambers; said cylinder means being fixedly located in said shell means near said first end and defining with said first end a first chamber which has an oil sump containing said oil lubricant; first bearing means secured to said cylinder means and extending towards said oil sump; second bearing means secured to said cylinder means and extending towards said second end; motor means including rotor means and stator means; said stator means fixedly located in said shell means between said cylinder means and said second end and axially spaced from said cylinder means and said second bearing means; eccentric shaft means supported by said first and second bearing means and including eccentric means operatively connected to said piston; said rotor means secured to said shaft means so as to be integral therewith and located within said stator so as to define therewith an annular gap; suction means for supplying gas to said pump means; discharge means fluidly connected to said shell means; said vane having a tip coacting with said piston; said tip having a diamond-like-carbon coating thereon made up of a series of alternating hard and lubricious layers whereby the coefficient of friction between said tip and piston is reduced and said tip has reduced wear even in the absence of sufficient lubricant as compared to a tip without said diamond-like-coating.
Claim 14
Dependent Claim
12 words
The compressor of claim 10 wherein said oil sump contains said lubricant.
Claim 15
Dependent Claim
14 words
The compressor of claim 10 wherein said coating is 0.5 to 5.0 μm thick.
Claim 16
Dependent Claim
21 words
The compressor of claim 12 wherein said series is made up of a plurality of bilayers 1 to 20 nm thick.
Claim 17
Dependent Claim
21 words
The compressor of claim 10 wherein said series is made up of a plurality of bilayers 1 to 20 nm thick.
Claim 18
Dependent Claim
12 words
The compressor of claim 10 wherein said lubricious layers are amorphous carbon.
Claim 19
Dependent Claim
19 words
The compressor of claim 15 wherein said hard layers are an amorphous assemblage of carbon and a transition metal.
Claim 20
Dependent Claim
19 words
The compressor of claim 15 wherein said hard materials are an amorphous assemblage of carbon and a transition metal.
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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) | 2002-09-06 | 2003-03-08 | 2003-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-09-06 | 2007-03-08 | 2007-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-09-06 | 2011-03-08 | 2011-09-07 | $7700.00 | Window Closed / Lapsed |