US3850235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Waagner Biro AG
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Filing: 1972-08-02
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Granted: 1974-11-26
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Expires: 1992-08-02
Abstract
Abstract A heat exchanger of the type adapted for use in generating steam in a nuclear power plant, and a method for manufacturing the same. A plurality of curved tubular walls are equidistantly arranged with respect to each other around a central axis with each of these walls having an inner concave side directed toward the axis and an outer convex side directed away from the axis and with each of the walls including an elongated tube having a hollow interior through which a heat-exchanging medium is adapted to flow. Each of the walls further includes a fin structure fixed to the tube thereof at least partially along the tube for forming a vibration-resistant, unitary tubular wall structure. The heat exchanger is manufactured by curving a plurality of finned tubes and welding the tubes to each other to form a tubular wall.
Inventors
- 👤 G Beckmann
- 👤 K Fritz
- 👤 J Lippitsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:48
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/14; F22B37/143; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/416; Y10S165/423
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
139 words
In a heat exchanger particularly for use as a steam generator for a nuclear power plant, a plurality of curved tubular walls equidistantly arranged with respect to each other around a central axis with each of said walls having an inner concave side directed toward said axis and an outer convex side directed away from said axis, each of said walls including an elongated tube having a hollow interior through which a heat-exchanging medium is adapted to flow and each of said walls further including a fin means fixed to said tube thereof at least partially along said tube for forming a vibration-resistant, unitary tubular wall structure, each of said tubular walls including a plurality of tubular portions which are axially spaced from each other and which are welded one to the next by way of said fin means.
Claim 2
Dependent Claim
139 words
In a heat exchanger particularly for use as a steam generator for a nuclear power plant, a plurality of curved tubular walls equidistantly arranged with respect to each other around a central axis with each of said walls having an inner concave side directed toward said axis and an outer convex side directed away from said axis, each of said walls including an elongated tube having a hollow interior through which a heat-exchanging medium is adapted to flow and each of said walls further including a fin means fixed to said tube thereof at least partially along said tube for forming a vibration-resistant, unitary tubular wall structure, each of said tubular walls including a plurality of tubular portions which are axially spaced from each other and which are welded one to the next by way of said fin means.
Claim 3
Dependent Claim
79 words
The combination of claim 1 and wherein the individual tubes of said tubular walls extend transversely with respect to the direction of flow of a heat-exchanging medium which flows around said tubular walls at the exterior thereof, each of said tubular walls having tubular portions between which said fin means is located, and spacer means operatively connected with said tubular walls for spacing the latter equidistantly from each other in a radial direction with respect to said central axis.
Claim 4
Dependent Claim
25 words
The combination of claim 1 and wherein each of said tubular walls extends along an involute curve in a plane normal to said central axis.
Claim 5
Dependent Claim
39 words
The combination of claim 1 and wherein said tubular walls respectively have the configuration of cylinders and are concentrically arranged with respect to said axis with the tube of each of said tubular walls extending spirally around said axis.
Claim 6
Dependent Claim
22 words
The combination of claim 1 and wherein a supporting frame means is welded to said fin means for supporting said tubular walls.
Claim 7
Dependent Claim
28 words
The combination of claim 5 and wherein said supporting frame means is located over said tubular walls so that the latter extend downwardly from said supporting frame means.
Claim 8
Dependent Claim
26 words
The combination of claim 5, and wherein said supporting frame means is situated beneath said tubular walls so that the latter rest on said frame means.
Claim 9
Dependent Claim
44 words
The combination of claim 2 and wherein said spacer means includes a plurality of screws radially arranged with respect to said central axis and fixed to adjoining tubular walls for spacing the latter from each other as well as fixing them to each other.
Claim 10
Dependent Claim
76 words
The combination of claim 8, and wherein each screw is fixed to a pair of said walls with one of said pair of walls forming an inner wall while the other of said pair of walls forms an outer wall situated at a greater distance from said central axis than said inner wall, each screw being threaded to the fin means of said inner wall and being welded to the fin means of said outer wall.
Claim 11
Dependent Claim
33 words
The combination of claim 2 and wherein said spacer means includes a plurality of elongated radially extending spacer elements welded to said fin means of said walls and determining the radial distance therebetween.
Claim 12
Dependent Claim
62 words
The combination of claim 1 and wherein each of said tubular walls has a pair of opposed ends and frame means welded to said walls at one of the ends thEreof for fixing the walls to each other and determining the radial spacing therebetween, and spacer means carried by said walls for determining the distance therebetween at locations beyond said frame means.
Claim 13
Dependent Claim
84 words
The combination of claim 1 and wherein an inner pipe has an axis coinciding with said central axis and an outer cylinder coaxially surrounds said inner pipe and defines therewith a space in which said tubular walls are located, and a plurality of supporting bars extending radially between and being fixed to said inner pipe and outer cylinder, said bars forming a supporting frame means and said plurality of tubular walls being fixed at one of the ends thereof to said supporting frame means.
References Cited (Backward Citations)
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US3286767A
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US3393665A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |