Patent US3724523A successfully refreshed from Google Patents.
US3724523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular structure for film evaporators
Assignee: GEA Group AG
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Filing: 1970-06-29
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Granted: 1973-04-03
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Expires: 1990-06-29
Abstract
Abstract A tube-bundle evaporator through the interior of the tubes of which the liquid to be evaporated is passed. The tubes are deformed so that the flow cross-section increases longitudinally in the direction of flow of the vapor while the perimeter or peripheral extent of the tube and, preferably, the diameter of the smallest circumscribing circle remains constant over the entire length of the tube.
Inventors
- 👤 K Mattern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:32
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/06; F28F13/08; B; B01; B01D; B01D1/00; B01D1/22; F28F1/00; F28F1/02; F28F1/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
A tube structure for an evaporator, comprising at least one tube traversed internally by a vaporizable liquid and heated by a fluid in contact with the exterior of said tube, said tube being formed internally having equal-diameter cylindrical end portions and between said end portions with a plurality of rectilinear, angularly equispaced troughs deformed from the tube wall extending along the tube and defining a flow cross-section of the tube increasing substantially linearly over the distance between said end portions and defining a direction of flow of fluid from the small to the large cross-section whereby the flow velocity through the tube is maintained substantially constant, said troughs having arcuate floors lying on a circle of the same diameter as said end portions whereby said tube is circumscribed by a circular cylinder of substantially constant diameter over its entire length, said troughs flooring from said small crosssection to said large cross-section.
Claim 2
Dependent Claim
151 words
A tube structure for an evaporator, comprising at least one tube traversed internally by a vaporizable liquid and heated by a fluid in contact with the exterior of said tube, said tube being formed internally having equal-diameter cylindrical end portions and between said end portions with a plurality of rectilinear, angularly equispaced troughs deformed from the tube wall extending along the tube and defining a flow cross-section of the tube increasing substantially linearly over the distance between said end portions and defining a direction of flow of fluid from the small to the large cross-section whereby the flow velocity through the tube is maintained substantially constant, said troughs having arcuate floors lying on a circle of the same diameter as said end portions whereby said tube is circumscribed by a circular cylinder of substantially constant diameter over its entire length, said troughs flooring from said small crosssection to said large cross-section.
Claim 3
Dependent Claim
19 words
The tube structure defined in claim 1 wherein at least three angularly equispaced troughs are provided about said axis.
Claim 4
Dependent Claim
37 words
The tube structure defined in claim 1 wherein said troughs in cross-section each have a pair of parallel sides and the sides of neighboring troughs include angles of substantially (360*/N), where N equals the number of troughs.
Claim 5
Dependent Claim
26 words
The tube structure defined in claim 1, further comprising a pair of tube sheets at opposite ends of said tube and secured to said end portions.
Claim 6
Dependent Claim
26 words
The tube structure defined in claim 1 wherein four such troughs are provided at the vertices of a star centered on the axis of the tube.
Claim 7
Dependent Claim
26 words
The tube Structure defined in claim 1 wherein three such troughs are provided at the vertices of a star centered on the axis of said tube.
References Cited (Backward Citations)
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Cited
US2998228A
Cited
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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 |