Patent US2689940A successfully refreshed from Google Patents.
US3880225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary regenerative heat exchanger
Assignee: Individual
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Filing: 1972-12-07
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Granted: 1975-04-29
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Expires: 1992-12-07
Abstract
Abstract A rotary regenerative heat exchanger including a device for detecting the rate of flow of leakage of heat exchange fluid between a seal and the relevant surface of the matrix and for controlling the application of pressurizing fluid to a pressurized seal in response to the detected rate of leakage flow, thereby to control the rate of leakage flow of heat exchange fluid and to maintain it at a desired value.
Inventors
- 👤 Robert Noel Penny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:06
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/02; Y10S165/021; Y10S165/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
162 words
A rotary regenerative heat exchanger comprising a rotatable disc-like matrix having heat exchange passages therein extending between end faces of the matrix, and seals co-operable with said end faces and defining areas thereof through which the fluids between which heat exchange is to be effected will flow in separated streams, at least one of said seals being in the form of a closed loop and having a hollow bellows-like cross-section and inlet means communicating with the interior of said hollow seal for the admission thereto of a pressurising fluid, the head exchanger also including means for detecting the rate of flow of leakage of heat exchange fluid between one of said seals and the adjacent end face of the matrix, a fluid-responsive device to control the supply of pressurising fluid to said pressurised seal in response to the detected rate of leakage flow and duct means provided adjacent said one seal to lead said leakage flow of fluid to said fluid-responsive device.
Claim 2
Dependent Claim
162 words
A rotary regenerative heat exchanger comprising a rotatable disc-like matrix having heat exchange passages therein extending between end faces of the matrix, and seals co-operable with said end faces and defining areas thereof through which the fluids between which heat exchange is to be effected will flow in separated streams, at least one of said seals being in the form of a closed loop and having a hollow bellows-like cross-section and inlet means communicating with the interior of said hollow seal for the admission thereto of a pressurising fluid, the head exchanger also including means for detecting the rate of flow of leakage of heat exchange fluid between one of said seals and the adjacent end face of the matrix, a fluid-responsive device to control the supply of pressurising fluid to said pressurised seal in response to the detected rate of leakage flow and duct means provided adjacent said one seal to lead said leakage flow of fluid to said fluid-responsive device.
Claim 3
Dependent Claim
29 words
A heat exchanger as claimed in claim 1 in which said fluid-responsive device comprises a pressure-actuated spool valve connected to control application of pressurising fluid to said pressurised seal.
Claim 4
Dependent Claim
25 words
A heat exchanger as claimed in claim 2 in which said spool valve includes an operating piston responsive to the pressure of said leakage fluid.
Claim 5
Dependent Claim
34 words
A heat exchanger as claimed in claim 1 in which said fluid-responsive device is a fluidics switching device controlled by said leakage fluid and connected to apply said pressurising fluid to said pressurised seal.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |