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US4418748A Expired / Lapsed US ⏱️ 0.0 years remaining

Heat exchanger whose hot end has a device for protecting the tube plate

Assignee: STEIN INDUSTRI
•
Filing: 1982-01-27
•
Granted: 1983-12-06
•
Expires: 2002-01-27
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Abstract

Abstract A heat exchanger comprising an outer casing closed at its hot and cool ends by two tube plates, a cluster of tubes which is connected to the tube plates to discharge into inlet and outlet collectors of a fluid flowing inside the tubes, and inlet and outlet tubings of a liquid flowing in the casing and around the tubes, wherein the exchanger comprises at its hot end a device for protecting the tube plate, such device comprising two plates united by a casing to define a first zone filled with such liquid in the static state forming a thermal screen, such plates being substantially parallel with the tube plate and a first one of such plates being disposed adjacent the tube plate, the protective device also comprising passages extending through such zone from one plate to another, and means for setting up a negative pressure between such first plate and the tube plates, to ensure that such liquid flows towards the tube plate inside such passages. Special application to heat exchangers for steam generators with liquid sodium primary fluid.

Inventors

  • 👤 Pierre Pouderoux
  • 👤 Guy Salon
  • 👤 Thong Nguyen-Thanh

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 04:09
CPC Classifications
F; F28; F28F; F28F19/00; F22; F22B; F22B1/00; F22B1/02; F22B1/06; F22B1/063; F28F21/00; F28F21/08; F28F21/081; F28F21/082; F28F21/083; F28F9/00; F28F9/02; F28F9/0229

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 166 words
A heat exchanger comprising an outer casing closed at its hot and cool ends by two tube plates, a cluster of tubes which is connected to the tube plates to discharge into inlet and outlet collectors of a fluid flowing inside the tubes, and inlet and outlet tubings of a liquid flowing in the casing and around the tubes, wherein the exchanger comprises at its hot end a device for protecting the tube plate, such device comprising two plates united by a casing to define a first zone filled with such liquid in the static state forming a thermal screen, such plates being substantially parallel with the tube plate and a first one of such plates being disposed adjacent the tube plate, the protective device also comprising passages extending through such zone from one plate to another, and means for setting up a negative pressure between such first plate and the tube plates, to ensure that such liquid flows towards the tube plate inside such passages.
Claim 2
Dependent Claim 166 words
A heat exchanger comprising an outer casing closed at its hot and cool ends by two tube plates, a cluster of tubes which is connected to the tube plates to discharge into inlet and outlet collectors of a fluid flowing inside the tubes, and inlet and outlet tubings of a liquid flowing in the casing and around the tubes, wherein the exchanger comprises at its hot end a device for protecting the tube plate, such device comprising two plates united by a casing to define a first zone filled with such liquid in the static state forming a thermal screen, such plates being substantially parallel with the tube plate and a first one of such plates being disposed adjacent the tube plate, the protective device also comprising passages extending through such zone from one plate to another, and means for setting up a negative pressure between such first plate and the tube plates, to ensure that such liquid flows towards the tube plate inside such passages.
Claim 3
Dependent Claim 29 words
An exchanger according to claim 1, wherein the passages are annular passages defined between the tubes of the cluster and sheathes inside which the tubes extend through the plates.
Claim 4
Dependent Claim 68 words
An exchanger according to claims 1 or 2, wherein the space defined between the first plate and the tube plate communicates with an annular zone enclosing the first zone, and the means for setting up a negative pressure comprise tubes via which such annular zone communicates with a second annular zone connected by apertures to a zone enclosing the tubes of the cluster downstream of the tube plate.
Claim 5
Dependent Claim 23 words
An exchanger according to claim 1, wherein it also comprises at least one intermediate plate disposed between the parallel plates and parallel therewith.
Claim 6
Dependent Claim 44 words
A device according to claim 1, wherein the second plate is connected to the external casing by a cylindrical casing formed with filling and emptying holes which enable the liquid to enter during filling and to be discharged during the emptying of the exchanger.

References Cited (Backward Citations)

US3245464A Cited
US3545536A Cited
FR1536825A Cited
US3630274A Cited
FR2010568A1 Cited
US3768554A Cited
US3811498A Cited
DE2713668A1 Cited
GB2082750A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-12-05 1987-06-06 1987-12-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-12-05 1991-06-06 1991-12-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-12-05 1995-06-06 1995-12-06 $7700.00 Window Closed / Lapsed

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