US3870081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange conduit
Assignee: Raufoss Ammunisjonsfabrikker AS
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Filing: 1973-02-09
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Granted: 1975-03-11
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Expires: 1993-02-09
Abstract
Abstract A heat exchange conduit is disclosed by which there are achieved improved heat transmission conditions by the fact that a rotation of the flowing medium in the conduit is produced at the same time as said rotation is disturbed by means being in good heat conducting connection with the wall of the conduit. The heat exchange conduit comprises internal ribs extending parallel to the longitudinal axis of the conduit, and at least one additional element in the conduit for promoting the heat exchange, whereby at least one such additional element is constituted by a strip, each strip being twisted and its principal axis being parallel to the longitudinal axis of the conduit.
Inventors
- 👤 Byrge Kleppe
- 👤 Ole Torgersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:26
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/42; F28F1/422; F28F1/40; F28F13/00; F28F13/06; F28F13/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
A heat-exchange element comprising an elongated tube having inner and outer surfaces, internal, longitudinally extending ribs projecting inwardly from the inner surface of said tube and having inner edges, and at least one additional element disposed within said tube for promoting heat exchange, said additional element being constituted by a twisted strip extending longitudinally through the tube and having a principal axis parallel to the longitudinal axis of the tube, said additional element being so dimensioned and disposed in the tube to have longitudinal edges bearing at least at certain points against the inner edges of at least two internal ribs whereby said ribs and strips cooperate to produce flow disturbance of a fluid flowing in the tube to increase heat transmission between said fluid and the wall of the tube.
Claim 2
Dependent Claim
131 words
A heat-exchange element comprising an elongated tube having inner and outer surfaces, internal, longitudinally extending ribs projecting inwardly from the inner surface of said tube and having inner edges, and at least one additional element disposed within said tube for promoting heat exchange, said additional element being constituted by a twisted strip extending longitudinally through the tube and having a principal axis parallel to the longitudinal axis of the tube, said additional element being so dimensioned and disposed in the tube to have longitudinal edges bearing at least at certain points against the inner edges of at least two internal ribs whereby said ribs and strips cooperate to produce flow disturbance of a fluid flowing in the tube to increase heat transmission between said fluid and the wall of the tube.
Claim 3
Dependent Claim
131 words
A heat-exchange element comprising an elongated tube having inner and outer surfaces, internal, longitudinally extending ribs projecting inwardly from the inner surface of said tube and having inner edges, and at least one additional element disposed within said tube for promoting heat exchange, said additional element being constituted by a twisted strip extending longitudinally through the tube and having a principal axis parallel to the longitudinal axis of the tube, said additional element being so dimensioned and disposed in the tube to have longitudinal edges bearing at least at certain points against the inner edges of at least two internal ribs whereby said ribs and strips cooperate to produce flow disturbance of a fluid flowing in the tube to increase heat transmission between said fluid and the wall of the tube.
Claim 4
Dependent Claim
131 words
A heat-exchange element comprising an elongated tube having inner and outer surfaces, internal, longitudinally extending ribs projecting inwardly from the inner surface of said tube and having inner edges, and at least one additional element disposed within said tube for promoting heat exchange, said additional element being constituted by a twisted strip extending longitudinally through the tube and having a principal axis parallel to the longitudinal axis of the tube, said additional element being so dimensioned and disposed in the tube to have longitudinal edges bearing at least at certain points against the inner edges of at least two internal ribs whereby said ribs and strips cooperate to produce flow disturbance of a fluid flowing in the tube to increase heat transmission between said fluid and the wall of the tube.
Claim 5
Dependent Claim
36 words
A heat-exchange element as claimed in claim 1 wherein said internal ribs project towards the center of the tube and a single one of said twisted strips is disposed between the free edges of said ribs.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |