US4392526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric tube heat exchanger with spacer
Assignee: Wieland Werke AG
•
Filing: 1981-04-24
•
Granted: 1983-07-12
•
Expires: 2001-04-24
Abstract
Abstract A heat exchanger for transferring heat from liquids or gases has an outer tube spaced from an concentric finned inner tube by a plurality of spacers. The spacers each have a tubular sleeve which engages the fins of the inner tube and a portion of the sleeve engages in the groove between adjacent fin turns of the inner tube. The outer surface of the spacer engages the internal surface of the outer tube. The spacer is preferably made of plastics material and the inner finned tube has fins formed in a threaded fashion. A preferred embodiment of the heat exchanger has a longitudinally slotted sleeve and the adjacent edges of the slot are formed to provide a snap-in engagement.
Inventors
- 👤 Manfred Hage
- 👤 Hans Demuth
- 👤 Otto Junker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:12
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/007; F28F9/013; F16; F16L; F16L7/00; F28D; F28D7/00; F28D7/10; F28D7/106; F28F2240/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
115 words
A heat exchanger comprising an outer tube, at least one substantially concentric inner tube having an outer surface, a fin radially extending from the outer surface of the inner tube and having a height less than the distance between the inner and outer tubes, said fin being formed around the inner tube and extending therealong in turns, spacers being provided between each of the tubes, each spacer having a tubular sleeve which bears against the outer surface fin of the inner tube and at least three circumferentially, substantially equi-spaced, radial supporting elements supporting the outer tube inner wall, said tubular sleeve having at least one retaining member engaging in the groove between adjacent fin turns.
Claim 2
Dependent Claim
115 words
A heat exchanger comprising an outer tube, at least one substantially concentric inner tube having an outer surface, a fin radially extending from the outer surface of the inner tube and having a height less than the distance between the inner and outer tubes, said fin being formed around the inner tube and extending therealong in turns, spacers being provided between each of the tubes, each spacer having a tubular sleeve which bears against the outer surface fin of the inner tube and at least three circumferentially, substantially equi-spaced, radial supporting elements supporting the outer tube inner wall, said tubular sleeve having at least one retaining member engaging in the groove between adjacent fin turns.
Claim 3
Dependent Claim
22 words
A heat exchanger according to claim 1, wherein said retaining member is in the form of at least one resilient retaining lug.
Claim 4
Dependent Claim
36 words
A heat exchanger according to claim 1, wherein the fin turns are in the form of an external thread on the inner tube and the tubular sleeve has an internal thread conforming to said fin turns.
Claim 5
Dependent Claim
16 words
A heat exchanger according to claim 3, wherein the internal thread consists of one thread turn.
Claim 6
Dependent Claim
17 words
A heat exchanger according to claim 4, wherein the internal thread consists of a broken thread turn.
Claim 7
Dependent Claim
17 words
A heat exchanger according to claim 3, wherein the spacer is in the form of extruded section.
Claim 8
Dependent Claim
15 words
A heat exchanger according to claim 1, wherein the spacer is made of plastics material.
Claim 9
Dependent Claim
17 words
A heat exchanger according to claim 7, wherein the tubular sleeve is provided with a longitudinal slot.
Claim 10
Dependent Claim
19 words
A heat exchanger according to claim 8, wherein adjacent longitudinal edges of the slot are arranged for snap-in engagement.
Claim 11
Dependent Claim
27 words
A heat exchanger according to claim 7, wherein the spacer is in two parts and is connected via supporting elements which are curved toward the outer tube.
References Cited (Backward Citations)
US1704097A
Cited
US2166808A
Cited
US2241209A
Cited
US2272428A
Cited
DE1702672U
Cited
US3036818A
Cited
US3105708A
Cited
GB1316110A
Cited
US3670811A
Cited
US3791416A
Cited
US3802491A
Cited
DE7206743U
Cited
US3976129A
Cited
US3934645A
Cited
US4086959A
Cited
US4250927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |