Patent US3920066A successfully refreshed from Google Patents.
US3920066A
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Regenerative air preheater
Assignee: Apparatebau Rothemuehle Brandt and Kritzler GmbH
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Filing: 1973-08-31
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Granted: 1975-11-18
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Expires: 1993-08-31
Abstract
Abstract A stationary mass regenerative air preheater has a bypass for the one of its heat-exchange gaseous media which is to be conducted by the rotating hoods placed in the central core of the regenerative mass. A control valve is provided in or at the end of the bypass to govern the bypass ratio and may be of a form positively to shutt-off access of the one of the media to the heat-exchange mass. Each hood is communicable with the bypass, which extends continuously between the end faces of the mass.
Inventors
- 👤 Franz Josef Kirchhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:15
CPC Classifications
F; F28; F28D; F28D17/00; F28D17/04; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/037; Y10S165/038; Y10S165/039
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
In a regenerative air preheater with a stationary regenerative mass having two end faces, two hoods rotatable about an axis over each said end face respectively to communicate one of the heat-exchange media to and from the mass, and a bypass for at least one of the media the improvement comprising a hollow core of the mass at the axis of rotation of the hoods and extending continuously from end face to end face of the mass and forming a gas-passing bypass duct completely through the axial length of the mass, a central portion of each of the two hoods communicable with an end of the bypass duct, and variable obturator means operable to vary the relative amounts of flow to the said one of the media through the mass and through the bypass duct wherein said obturator means comprises movable flaps at one end of the duct and operable also positively to prevent flow through one of the mass and the bypass duct.
Claim 2
Dependent Claim
164 words
In a regenerative air preheater with a stationary regenerative mass having two end faces, two hoods rotatable about an axis over each said end face respectively to communicate one of the heat-exchange media to and from the mass, and a bypass for at least one of the media the improvement comprising a hollow core of the mass at the axis of rotation of the hoods and extending continuously from end face to end face of the mass and forming a gas-passing bypass duct completely through the axial length of the mass, a central portion of each of the two hoods communicable with an end of the bypass duct, and variable obturator means operable to vary the relative amounts of flow to the said one of the media through the mass and through the bypass duct wherein said obturator means comprises movable flaps at one end of the duct and operable also positively to prevent flow through one of the mass and the bypass duct.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |