Patent US4022270A successfully refreshed from Google Patents.
US4022270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire detector scanning arrangement
Assignee: Alstom Power Inc
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Filing: 1976-02-17
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Granted: 1977-05-10
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Expires: 1996-02-17
Abstract
Abstract A detector that monitors infra-red ray emission from an air preheater to detect a temperature rise that precedes a fire within the air preheater. The detector of infra-red rays is alternately moved between a "detecting" stage within the air preheater and a "cleaning" stage in clean ambient air where particulate matter deposited thereon by dirty gas may be removed to maintain the detector at a high degree of operating efficiency.
Inventors
- 👤 Richard Franklin Stockman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:40
CPC Classifications
F; F28; F28F; F28F27/00; F28F27/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A heat exchanger housing including inlet and outlet ducts for a heating fluid and for a fluid to be heated, a matrix of heat absorbent material carried in said housing, means for alternately subjecting said matrix to the heating fluid and the fluid to be heated, an infra-red ray detecting means positioned in the housing to view the infra-red rays emitted by the matrix, an opening in said housing adapted to receive the infra-red ray detecting means, an air lock having an enclosure with an open side thereof in common with the opening of said housing, a pivotal carrier supporting the infra-red ray detecting means, and means moving the infra-red ray detector from a position within said housing where it faces said matrix to a position within said air-lock where it covers the open side thereof.
Claim 2
Dependent Claim
136 words
A heat exchanger housing including inlet and outlet ducts for a heating fluid and for a fluid to be heated, a matrix of heat absorbent material carried in said housing, means for alternately subjecting said matrix to the heating fluid and the fluid to be heated, an infra-red ray detecting means positioned in the housing to view the infra-red rays emitted by the matrix, an opening in said housing adapted to receive the infra-red ray detecting means, an air lock having an enclosure with an open side thereof in common with the opening of said housing, a pivotal carrier supporting the infra-red ray detecting means, and means moving the infra-red ray detector from a position within said housing where it faces said matrix to a position within said air-lock where it covers the open side thereof.
Claim 3
Dependent Claim
38 words
A heat exchanger as defined in claim 1 including sealing means that surrounds the opening in the wall of said air lock to bridge the space between said opening and the detector when said detector is moved thereto.
Claim 4
Dependent Claim
24 words
A heat exchanger as defined in claim 1 wherein the air lock includes a removable door that gives access to the infra-red ray detector.
Claim 5
Dependent Claim
26 words
A heat exchanger as defined in claim 1 wherein the infra-red ray detecting means is mounted in the inlet duct for the fluid to be heated.
Claim 6
Dependent Claim
39 words
A heat exchanger as defined in claim 1 wherein the infra-red ray detecting means comprises a plurality of detector heads radially spaced across the inlet duct for the fluid to be heated and actuated by a single actuating rod.
References Cited (Backward Citations)
CA710205A
Cited
US3181602A
Cited
GB1126466A
Cited
US3918516A
Cited
US3730259A
Cited
US3861458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |