Patent US4019336A successfully refreshed from Google Patents.
US4019336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerator
Assignee: US Philips Corp
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Filing: 1975-08-07
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Granted: 1977-04-26
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Expires: 1995-08-07
Abstract
Abstract A refrigerator in which the main regenerator has connected parallel thereto an auxiliary regenerator formed by a gap between the cooperating cylinder and displacer walls.
Inventors
- 👤 Andries Mijnheer
- 👤 Albert Klaas De Jonge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:43
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/044; F02G1/0445; F02G2250/00; F02G2250/18; F05; F05C; F05C2225/00; F05C2225/08; F25B2309/00; F25B2309/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
A refrigerator comprising a compression space of variable volume and higher mean temperature during operation which communicates with an expansion space of lower mean temperature during operation, the volume of the said expansion space being variable by a displacer which is reciprocatable in a cylinder, the communication between the said spaces incorporating a regenerator through which a working medium can flow to and fro between the two spaces, characterized in that the communication between the said two spaces incorporates an auxiliary regenerator, connected parallel to the regenerator and formed by an annular gap between the displacer and the cooperating cylinder wall, at least one of the two facing surfaces of displacer and cylinder having a high thermal capacity with respect to the working medium flow through the gap during operation, the hydraulic diameter of the gap satisfying the relation: 0.4 d.sub.h .sbsb.o ≦ d.sub.h ≦ 1.4 d.sub.h.sbsb.o where ##EQU4## d h = hydraulic diameter of the gap s = stroke length of the displacer η = mean dynamic viscosity of the working medium in the gap L = length of the gap ρ = mean density of the working medium in the gap ΔP = mean pressure drop across the regenerator.
Claim 2
Dependent Claim
201 words
A refrigerator comprising a compression space of variable volume and higher mean temperature during operation which communicates with an expansion space of lower mean temperature during operation, the volume of the said expansion space being variable by a displacer which is reciprocatable in a cylinder, the communication between the said spaces incorporating a regenerator through which a working medium can flow to and fro between the two spaces, characterized in that the communication between the said two spaces incorporates an auxiliary regenerator, connected parallel to the regenerator and formed by an annular gap between the displacer and the cooperating cylinder wall, at least one of the two facing surfaces of displacer and cylinder having a high thermal capacity with respect to the working medium flow through the gap during operation, the hydraulic diameter of the gap satisfying the relation: 0.4 d.sub.h .sbsb.o ≦ d.sub.h ≦ 1.4 d.sub.h.sbsb.o where ##EQU4## d h = hydraulic diameter of the gap s = stroke length of the displacer η = mean dynamic viscosity of the working medium in the gap L = length of the gap ρ = mean density of the working medium in the gap ΔP = mean pressure drop across the regenerator.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |