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US4945635A
Expired / Lapsed
US
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Method of manufacturing brazable pipes and heat exchanger
Assignee: Resonac Holdings Corp
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Filing: 1989-05-30
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Granted: 1990-08-07
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Expires: 2009-05-30
Abstract
Abstract A process for producing breazeable pipes particularly for use in heat exchangers, the process comprising preparing a brazing sheet (30) which comprises a core sheet (30a) coated with a brazing substance (30b) at least on one surface, forming a bulged (36) portion of a semi-circular cross-section in the central section of the brazing sheet, providing apertures (13) in the bulged portion for securing tube ends therein, and rolling the brazing sheet into a cylinder with its opposite ends (38) being butt jointed to each other.
Inventors
- 👤 Mitsuru Nobusue
- 👤 Noboru Kodachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:42
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/084; B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/09; B21D; B21D53/00; B21D53/02; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; B23K35/00; B23K35/02; B23K35/0222; B23K35/0233; B23K35/0238; F28F9/00; F28F9/02; F28F9/0243; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373; Y10T29/49377; Y10T29/49378; Y10T29/49389; Y10T29/49391; Y10T29/49393
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
153 words
A process for producing a heat exchanger or the like, the heat exchanger including a header, fins and tubes whose ends are connected to the header, the process comprising: preparing a brazing sheet which includes a core sheet coated with a brazing substance at least on one surface; forming a bulged portion in the brazing sheet, the bulged portion having a semi-circular cross-section; providing apertures in the bulged portion; rolling the brazing sheet into a cylinder to form a header, the opposite ends of the sheet being butt jointed to each other; providing a tube for each aperture; inserting the end of each tube into the corresponding aperture of the header; placing fins between adjacent tubes so as to fabricate a provisional assembly of the tubes, the fins and the header; and heating the provisional assembly in a brazing furnace to effect a permanent joint among the tubes, the fins and the header.
Claim 2
Dependent Claim
153 words
A process for producing a heat exchanger or the like, the heat exchanger including a header, fins and tubes whose ends are connected to the header, the process comprising: preparing a brazing sheet which includes a core sheet coated with a brazing substance at least on one surface; forming a bulged portion in the brazing sheet, the bulged portion having a semi-circular cross-section; providing apertures in the bulged portion; rolling the brazing sheet into a cylinder to form a header, the opposite ends of the sheet being butt jointed to each other; providing a tube for each aperture; inserting the end of each tube into the corresponding aperture of the header; placing fins between adjacent tubes so as to fabricate a provisional assembly of the tubes, the fins and the header; and heating the provisional assembly in a brazing furnace to effect a permanent joint among the tubes, the fins and the header.
Claim 3
Dependent Claim
69 words
A process for producing brazeable pipes, the process comprising: preparing a brazing sheet which comprises a core sheet coated with a brazing substance at least on one surface, forming a bulged portion of a semi-circular cross-section in the brazing sheet, providing apertures in the bulged portion for insertion of tube ends, and rolling the brazing sheet into a cylinder with its opposite ends being butt jointed to each other.
Claim 4
Dependent Claim
69 words
A process for producing brazeable pipes, the process comprising: preparing a brazing sheet which comprises a core sheet coated with a brazing substance at least on one surface, forming a bulged portion of a semi-circular cross-section in the brazing sheet, providing apertures in the bulged portion for insertion of tube ends, and rolling the brazing sheet into a cylinder with its opposite ends being butt jointed to each other.
Claim 5
Dependent Claim
21 words
A process as defined in claim 2, wherein the apertures are provided in the direction of circumference of the bulged portion.
Claim 6
Dependent Claim
22 words
A process as defined in claim 2, wherein the apertures are provided in the direction of the length of the brazing sheet.
Claim 7
Dependent Claim
31 words
A process as defined in claim 2, wherein the apertures are produced by means of a press against an external chill placed in contact with the surface of the bulged portion.
Claim 8
Dependent Claim
16 words
A process as defined in claim 2, wherein the apertures are produced by means of milling.
Claim 9
Dependent Claim
59 words
A process as defined in claim 2, wherein the brazing sheet has its ends slanted so that when the brazing sheet is rolled into a cylinder, the slanted ends coated with a brazing substance are butt jointed complementary to the thickness of the brazing sheet so as to form seams flush with the walls of the the rolled cylinder.
Claim 10
Dependent Claim
84 words
A process for producing brazeable pipes, the process comprising: preparing a brazing sheet which comprises a core sheet coated with a brazing substance at least on one surface, forming a bulged portion of a semi-circular cross-section in the brazing sheet, providing apertures in the bulged portion for insertion of tube ends, rolling the brazing sheet into a cylinder with its opposite ends being butt jointed to each other, and covering at least one of the open ends of the rolled cylinder with a cap.
Claim 11
Dependent Claim
84 words
A process for producing brazeable pipes, the process comprising: preparing a brazing sheet which comprises a core sheet coated with a brazing substance at least on one surface, forming a bulged portion of a semi-circular cross-section in the brazing sheet, providing apertures in the bulged portion for insertion of tube ends, rolling the brazing sheet into a cylinder with its opposite ends being butt jointed to each other, and covering at least one of the open ends of the rolled cylinder with a cap.
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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) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |