US4422499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making of steam generator water boxes
Assignee: Areva NP SAS
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Filing: 1980-09-24
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Granted: 1983-12-27
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Expires: 2000-09-24
Abstract
Abstract A heat exchanger water box for steam generators bounded by a hemispherical base and a tube sheet on which the ends of the U-shaped tubes of the exchanger are fixed, on either side of a partition plate separating the water box into two chambers, respectively for supply and evacuation. The partition plate (3) fits with clearance over its whole periphery into a circular groove and a diametrical groove (11) respectively provided in the inner walls of the hemispherical base (2) and the tube sheet (1), and the hemispherical base (2) has at least one drain orifice (26) passing through it which opens at the lowest point of the circular groove for fitting the plate.
Inventors
- 👤 Michel Batistoni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:28
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/22; F28; F28F; F28F9/00; F28F9/02; F28F9/0202
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
135 words
Water box for a steam generator having a bank of U-shaped tubes whose ends are fixed to a tube sheet, said water box comprising a substantially hemispherical base (2) applied to said tube sheet (1) and bounding a space divided into a supply chamber (21) and an evacuation chamber (22) by a semi-circular partition plate (3) which fits with clearance over its whole periphery into a circular groove and a diametrical groove (11) respectively provided in the inner walls of said hemispherical base (2) and said tube sheet (1), said hemispherical base (2) having at least one drain orifice (26) passing through it which opens at the lowest point of said circular groove for fitting said plate (3), said orifice (26) being capable of communicating with the two chambers (21, 22) of said water box.
Claim 2
Dependent Claim
135 words
Water box for a steam generator having a bank of U-shaped tubes whose ends are fixed to a tube sheet, said water box comprising a substantially hemispherical base (2) applied to said tube sheet (1) and bounding a space divided into a supply chamber (21) and an evacuation chamber (22) by a semi-circular partition plate (3) which fits with clearance over its whole periphery into a circular groove and a diametrical groove (11) respectively provided in the inner walls of said hemispherical base (2) and said tube sheet (1), said hemispherical base (2) having at least one drain orifice (26) passing through it which opens at the lowest point of said circular groove for fitting said plate (3), said orifice (26) being capable of communicating with the two chambers (21, 22) of said water box.
Claim 3
Dependent Claim
74 words
Water box according to claim 1, wherein said partition plate (3) rests on said hemispherical base (2) on blocks (32) so as to maintain a clearance between the lower edge (30) of said plate (3) and the bottom of said circular groove, the upper edge (31) of said plate being freely slidable in said groove (11) of said tube sheet as a function of the differential deformations of the parts constituting said water box.
Claim 4
Dependent Claim
30 words
Water box according to claim 1 or 2 wherein said groove for fitting said partition plate (3) is provided in the depth of the corresponding wall of said water box.
Claim 5
Dependent Claim
51 words
Water box according to claim 2, wherein said circular groove is delimited by two parallel ribs (25) provided on the inner face of said hemispherical base (2), passages (27) being provided at the lower part of said ribs (25) for communicating with said drain orifice (26) of said hemispherical base (2).
References Cited (Backward Citations)
US1831337A
Cited
US4285396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |