US3724537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger with backed thin tubes
Assignee: Individual
•
Filing: 1971-09-28
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Granted: 1973-04-03
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Expires: 1991-09-28
Abstract
Abstract This application discloses a heat exchanger having thin lining tubes, as of plastic or metal, deformed against structural tubular backing and thermal exchange elements to provide extensive effective thermal transfer contact and support with contoured securement between tubes and backing elements which obviates relative displacement and relieves differential thermal change in length and stresses. Also the method of making the assembly.
Inventors
- 👤 H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:07
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B21D53/085; F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/30; F28F1/32; F28F19/00; F28F19/02; F28F19/04; F28F21/00; F28F21/06; F28F21/062; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F9/18; F28F9/187; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A heat exchanger, comprising in combination an outer tubular backing structure extending completely in supporting continuity between tube end connections at pressure fluid chambers and having contour concavities along its length and an inner lining tube which is too thin and weak to alone withstand applied internal pressure and having in-situ pressure-formed projections along its length fitting tightly in full heat exchange and backed relationship with the full interior surface of the outer tubular backing structure, the inner lining tube being fully backed throughout its length by the continuous outer tubular backing structure for the complete distance between the tube end connections and pressure chambers to avoid the application of pressure fluid to any portion of the inner lining tube where it is not fully supported by the outer tubular backing structure.
Claim 2
Dependent Claim
132 words
A heat exchanger, comprising in combination an outer tubular backing structure extending completely in supporting continuity between tube end connections at pressure fluid chambers and having contour concavities along its length and an inner lining tube which is too thin and weak to alone withstand applied internal pressure and having in-situ pressure-formed projections along its length fitting tightly in full heat exchange and backed relationship with the full interior surface of the outer tubular backing structure, the inner lining tube being fully backed throughout its length by the continuous outer tubular backing structure for the complete distance between the tube end connections and pressure chambers to avoid the application of pressure fluid to any portion of the inner lining tube where it is not fully supported by the outer tubular backing structure.
Claim 3
Dependent Claim
47 words
A heat exchanger as set forth in claim 1, wherein the concavities in the outer tubular structure comprise annular grooves pre-formed on collars of finned thermal transfer elements stacked on the tube and wherein the inner lining tube is expanded in-situ to fully fill the annular grooves.
Claim 4
Dependent Claim
33 words
A heat exchanger as set forth in claim 2, wherein the pre-formed annular gRooves are formed by an inclined end flange on one collar abutting an inclined intermediate web of an adjacent collar.
Claim 5
Dependent Claim
40 words
A heat exchanger as set forth in claim 2, wherein the pre-formed annular grooves are formed by an inclined web and inclined terminal flange on one collar, the terminal flange lying upon an inclined intermediate web of an adjacent collar.
Claim 6
Dependent Claim
40 words
A heat exchanger as set forth in claim 1, wherein the inner lining tube is formed of a plastic with its projections formed in-situ in form-fitting shape in the concavities and all other portions of the outer tubular backing structure.
Claim 7
Dependent Claim
15 words
A heat exchanger as set forth in claim 5, in which the plastic is polyethylene.
Claim 8
Dependent Claim
69 words
A heat exchanger as set forth in claim 2, wherein a plurality of tubes and outer tubular backing structures therefor are provided and in which the inner tubes are of plastic material and extend through a tube sheet of an end connection and are fused to nipples of a plastic tube sheet liner in pressure-balanced relationship in a pressure fluid chamber on the liner side of the tube sheet.
Claim 9
Independent Claim
112 words
The method of making a heat exchange assembly which includes very thin inner lining tubes within an outer tubular backing structure with internal contour concavities disposed between tube end connections at pressure fluid chambers, which comprises: assembling inner lining tubes of uniform diameter within the outer tubular backing structure with the entire length of the inner lining tubes between tube end connections completely backed by the outer tubular structure, and expanding the thin inner lining tubes into the outer tubular backing structure throughout its length to fit into intimate backing and heat exchange relationship therewith and to form contour projections in-situ which fully fill the concavities of the outer tubular backing structure.
Claim 10
Independent Claim
112 words
The method of making a heat exchange assembly which includes very thin inner lining tubes within an outer tubular backing structure with internal contour concavities disposed between tube end connections at pressure fluid chambers, which comprises: assembling inner lining tubes of uniform diameter within the outer tubular backing structure with the entire length of the inner lining tubes between tube end connections completely backed by the outer tubular structure, and expanding the thin inner lining tubes into the outer tubular backing structure throughout its length to fit into intimate backing and heat exchange relationship therewith and to form contour projections in-situ which fully fill the concavities of the outer tubular backing structure.
Claim 11
Dependent Claim
78 words
The method as set forth in claim 8, wherein the outer tubular backing structure comprises interfitting collars on finned heat exchange elements which are stacked on the inner lining tubes to form annular grooves at their ends, and in which the inner lining tubes are of plastic material expanded in-situ to fill the outer tubular backing structure and are fused at their ends to a plastic component at end connections in pressure-balanced relationship in the pressure fluid chambers.
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |