Patent US3853437A successfully refreshed from Google Patents.
US3853437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split cycle cryogenic cooler with rotary compressor
Assignee: United States Department of the Army
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Filing: 1973-10-18
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Granted: 1974-12-10
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Expires: 1993-10-18
Abstract
Abstract A rotary compressor providing modulated pressure pulses to a remotely located free displacer. The rotary compressor employs a novel modified Wankel-type mechanism in which two adjacent chamber regions are shorted to the crankcase of the device or to a bypass volume while the third chamber region develops the pressure pulses which are communicated to the free displacer by means of a valveless line.
Inventors
- 👤 S Horn
- 👤 B Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:05
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/12; F04C25/00; F25; F25B; F25B9/00; F25B9/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
161 words
A rotary compressor for generating pressure pulses comprising: a two-lobed chamber; a rotor positioned in said chamber and coupled to a drive means for rotating said rotor in said chamber in an epitrochoidal path, said rotor having three arcuate sides and dividing said chamber into three volume regions as it revolves; three ports located in said chamber; one of said ports, utilize as an output port far said pressure pulses, being located substantially at a perigee of the twolobed chamber in a region in which said pressure pulses are developed; and with one of each of the other two remaining ports being located respectively in each lobe of the chamber; and the two remaining ports being angularly spaced about said one of said ports with one of each of the remaining ports being located respectively in each lobe of the chamber and being shorted to a common volume means to prevent pressure increase in the regions of these two remaining ports.
Claim 2
Dependent Claim
161 words
A rotary compressor for generating pressure pulses comprising: a two-lobed chamber; a rotor positioned in said chamber and coupled to a drive means for rotating said rotor in said chamber in an epitrochoidal path, said rotor having three arcuate sides and dividing said chamber into three volume regions as it revolves; three ports located in said chamber; one of said ports, utilize as an output port far said pressure pulses, being located substantially at a perigee of the twolobed chamber in a region in which said pressure pulses are developed; and with one of each of the other two remaining ports being located respectively in each lobe of the chamber; and the two remaining ports being angularly spaced about said one of said ports with one of each of the remaining ports being located respectively in each lobe of the chamber and being shorted to a common volume means to prevent pressure increase in the regions of these two remaining ports.
Claim 3
Dependent Claim
33 words
The compressor of claim 1, wherein said common volume means comprises a crank case adjacent said chamber with which said two remaining ports communicate and are thereby shorted to prevent said pressure increase.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |