Patent DE242218C successfully refreshed from Google Patents.
US4013121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam generator, tube-bundle centering arrangement
Assignee: Siemens AG
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Filing: 1974-07-15
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Granted: 1977-03-22
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Expires: 1994-07-15
Abstract
Abstract A steam generator has an upstanding tube bundle radially enclosed by a vertical cylindrical wall, the tube bundle being centered within the wall by a tube spacer grid connected to the inside of the wall by keys and keyways which can slide vertically relative to each other, relieving the tube bundle and wall from mechanical stressing due to vertical thermal expansion and contraction causing relative vertical movement between the tube bundle and wall.
Inventors
- 👤 Wolfgang Berger
- 👤 Hans Rottger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:03
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/06; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/20; F22B37/205; F28F; F28F9/00; F28F9/007; F28F9/013; F28F9/0135; F28F9/0136; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/405; Y10S165/407; Y10S165/409; Y10S165/41
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
A steam generator having a tube sheet, a heat-exchanger tube bundle having ends mounted in said tube sheet and extending from said tube sheet, a cylindrical wall surrounding said tube bundle, at least one tube bundle tube spacer grid having a ring encircling said bundle inside of said cylindrical wall, and means for connecting said ring to said wall; wherein the improvement comprises said means being in the form of keys and keyways extending radially with respect to said ring and wall and relatively sliding longitudinally with respect to said tube bundle and wall when said ring and said wall thermally move relative to each other, while locking said ring non-rotatively relative to said wall.
Claim 2
Dependent Claim
115 words
A steam generator having a tube sheet, a heat-exchanger tube bundle having ends mounted in said tube sheet and extending from said tube sheet, a cylindrical wall surrounding said tube bundle, at least one tube bundle tube spacer grid having a ring encircling said bundle inside of said cylindrical wall, and means for connecting said ring to said wall; wherein the improvement comprises said means being in the form of keys and keyways extending radially with respect to said ring and wall and relatively sliding longitudinally with respect to said tube bundle and wall when said ring and said wall thermally move relative to each other, while locking said ring non-rotatively relative to said wall.
Claim 3
Dependent Claim
51 words
The steam generator of claim 1 in which said keyways have bottoms and said keys have ends facing said bottoms, said bottoms and ends being interspaced a distance greater than the distance said ring and wall thermally move radially relative to each other during the normal operation of said steam generator.
Claim 4
Dependent Claim
15 words
The steam generator of claim 1 having at least three of said keys and keyways.
Claim 5
Dependent Claim
16 words
The steam generator of claim 1 in which said keys and keyways have rectangular cross sections.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |