US3592261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Lummus Technology LLC
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Filing: 1968-11-25
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Granted: 1971-07-13
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Expires: 1988-11-25
Abstract
Abstract In combination with a heat exchanger, insulating tube inserts positioned in the inlet portion of the heat exchanger tubes which are at least coextensive with the portion of the tubes retained in the inlet tube sheet to reduce both thermal stresses and the overall temperature of the tube sheet.
Inventors
- 👤 Gary M Biack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:27
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/002
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
157 words
In combination with a heat exchanger employed for the rapid cooling of a high temperature fluid having at least one heat exchange tube supported by a tube sheet and wherein the high temperature fluid is passed through said heat exchange tube, a heat insulating insert positioned in the inlet end of the tube having a length which is at least coextensive with the portion of the heat exchange tube retained in the tube sheet, whereby high temperature fluid to be introduced into the heat exchange tube flows through the insert, said insert comprising a hollow openended metal tube having a high temperature heat resistant insulating jacket means wrapped around the exterior thereof, said insulating jacket means insulating the tube sheet from the high temperature fluid flowing through the tube to reduce the overall temperature of the tube sheet and the thermal gradients across the tube sheet; and a thin piece of metal foil covering the heatinsulating jacket.
Claim 2
Dependent Claim
157 words
In combination with a heat exchanger employed for the rapid cooling of a high temperature fluid having at least one heat exchange tube supported by a tube sheet and wherein the high temperature fluid is passed through said heat exchange tube, a heat insulating insert positioned in the inlet end of the tube having a length which is at least coextensive with the portion of the heat exchange tube retained in the tube sheet, whereby high temperature fluid to be introduced into the heat exchange tube flows through the insert, said insert comprising a hollow openended metal tube having a high temperature heat resistant insulating jacket means wrapped around the exterior thereof, said insulating jacket means insulating the tube sheet from the high temperature fluid flowing through the tube to reduce the overall temperature of the tube sheet and the thermal gradients across the tube sheet; and a thin piece of metal foil covering the heatinsulating jacket.
Claim 3
Dependent Claim
24 words
The heat exchanger as defined in claim 1 wherein the heat exchanger includes a plurality of tubes, each tube being provided with an insert.
Claim 4
Dependent Claim
45 words
The heat exchanger of claim 2 wherein the inlet tube sheet is covered with insulating material and the tubular insert extends beyond the heat exchanger tubes and through the insulating material for a length which is about equal to the thickness of the insulating material.
Claim 5
Dependent Claim
29 words
The heat exchanger of claim 3 wherein said insulating jacket of the insert also covers the portion of the insert extending through the insulating material of the tube sheet.
Claim 6
Dependent Claim
28 words
The heat exchanger of claim 3 wherein the portion of the tube insert extending through the insulating material of the tube sheet is free of an insulating jacket.
Claim 7
Dependent Claim
37 words
The heat exchanger of claim 3 wherein the insert includes a stop ring at the portion of the insert to be located at the end of the heat exchanger tubes for positioning the insert in the tubes.
Claim 8
Dependent Claim
54 words
The heat exchanger as defined in claim 1 wherein the metal tube includes an enlarged end portion, said enlarged end portion being free of the heat-insulating jacket, said enlarged end portion being positioned within the portion of the heat exchange tube beyond the portion of the heat exchange tube retained in the tube sheet.
Claim 9
Dependent Claim
29 words
The heat exchanger as defined in claim 7 wherein the enlarged end portion of the insert defines an interference fit with the inner wall of the heat exchange tube.
References Cited (Backward Citations)
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US1894956A
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US2195403A
Cited
US2620830A
Cited
US3001766A
Cited
US3330337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |