US5787712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic refrigerator
Assignee: Daikin Industries Ltd
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Filing: 1996-11-08
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Granted: 1998-08-04
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Expires: 2016-11-08
Abstract
Abstract A cryogenic refrigerator includes a displacer and a cylinder therein for generating a very low temperature. And, a sealing ring is provided in an inserted condition within a ring shaped groove which is formed at an outer peripheral portion of the displacer, the sealing ring having resilience for extending itself outward so that a sealing member on an outer diameter thereof is enlarged and that an outer portion of the sealing ring is slidably contacted to an inner face of the cylinder, and the sealing ring being made of non-magnetic alloy, thereby a magnetic noise and disturbance of an outer magnetic field due to the cryogenic refrigerator are greatly decreased.
Inventors
- 👤 Naoki Fukui
- 👤 Shuji Fujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:44
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
89 words
A cryogenic refrigerator, comprising: a displacer housed within a cylinder in a reciprocatingly movable manner, the displacer having a ring shaped groove formed on an outer peripheral portion thereof; and a sealing ring received in the ring shaped groove, the sealing ring having resilience for extending itself outward such that an outer diameter thereof is enlarged and such that a sealing member disposed on an outer portion of the sealing ring slidably contacts an inner face of the cylinder, wherein the sealing ring is made of a non-magnetic alloy.
Claim 2
Dependent Claim
89 words
A cryogenic refrigerator, comprising: a displacer housed within a cylinder in a reciprocatingly movable manner, the displacer having a ring shaped groove formed on an outer peripheral portion thereof; and a sealing ring received in the ring shaped groove, the sealing ring having resilience for extending itself outward such that an outer diameter thereof is enlarged and such that a sealing member disposed on an outer portion of the sealing ring slidably contacts an inner face of the cylinder, wherein the sealing ring is made of a non-magnetic alloy.
Claim 3
Dependent Claim
29 words
A cryogenic refrigerator as set forth in claim 1, wherein the non-magnetic alloy is non-magnetic alloy selected among copper alloy, aluminum alloy, titanium alloy, and high manganese non-magnetic steel.
Claim 4
Dependent Claim
40 words
A cryogenic refrigerator as set forth in claim 1, wherein the sealing ring is a wound wire rod disposed in a coil shape, the wound wire rod being inclined by a predetermined angle with respect to a pitch direction thereof.
Claim 5
Dependent Claim
102 words
A cryogenic refrigerator, comprising: a displacer housed within a cylinder in a reciprocatingly movable manner, the displacer having a ring shaped groove formed on an outer peripheral portion thereof; and a sealing ring received in the ring shaped groove, the sealing ring having resilience for extending itself outward such that an outer diameter thereof is enlarged and such that a sealing member disposed on an outer portion of the sealing ring slidably contacts an inner face of the cylinder, wherein the sealing ring is made of a non-magnetic alloy selected among copper alloy, aluminum alloy, titanium alloy, and high manganese non-magnetic steel.
Claim 6
Dependent Claim
102 words
A cryogenic refrigerator, comprising: a displacer housed within a cylinder in a reciprocatingly movable manner, the displacer having a ring shaped groove formed on an outer peripheral portion thereof; and a sealing ring received in the ring shaped groove, the sealing ring having resilience for extending itself outward such that an outer diameter thereof is enlarged and such that a sealing member disposed on an outer portion of the sealing ring slidably contacts an inner face of the cylinder, wherein the sealing ring is made of a non-magnetic alloy selected among copper alloy, aluminum alloy, titanium alloy, and high manganese non-magnetic steel.
Claim 7
Dependent Claim
30 words
A sealing ring for urging a sealing member against a cylinder wall of an expander section of a cryogenic refrigerator, comprising: a coiled wire member disposed in a ring shape.
Claim 8
Dependent Claim
30 words
A sealing ring for urging a sealing member against a cylinder wall of an expander section of a cryogenic refrigerator, comprising: a coiled wire member disposed in a ring shape.
Claim 9
Dependent Claim
21 words
The sealing ring defined by claim 5, wherein: said coiled wire member is inclined with respect to a pitch direction thereof.
Claim 10
Dependent Claim
17 words
The sealing ring defined by claim 5, wherein : said coiled wire member comprises a continuous ring.
Claim 11
Dependent Claim
18 words
The sealing ring defined by claim 5, wherein: said coiled wire member is formed of a non-magnetic alloy.
Claim 12
Dependent Claim
30 words
The sealing ring defined by claim 8, wherein: said non-magnetic alloy comprises an alloy selected among the group comprising copper alloy, aluminum alloy, titanium alloy and high manganese non-magnetic steel.
Claim 13
Dependent Claim
19 words
The sealing ring defined by claim 9, wherein: said sealing ring and said sealing member comprise a sealing arrangement.
Claim 14
Dependent Claim
32 words
The sealing ring defined by claim 5, wherein: said coiled wire member comprises a continuous ring, is inclined with respect to a pitch direction thereof and is formed of a non-magnetic alloy.
Claim 15
Dependent Claim
30 words
The sealing ring defined by claim 10, wherein: said non-magnetic alloy comprises an alloy selected among the group comprising copper alloy, aluminum alloy, titanium, alloy and high manganese non-magnetic steel.
Claim 16
Dependent Claim
19 words
The sealing ring defined by claim 12, wherein: said sealing ring and said sealing member comprise a sealing arrangement.
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) | 2001-08-03 | 2002-02-02 | 2002-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-03 | 2006-02-02 | 2006-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-03 | 2010-02-02 | 2010-08-04 | $7700.00 | Window Closed / Lapsed |