US3897773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damper
Assignee: Individual
•
Filing: 1973-11-07
•
Granted: 1975-08-05
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Expires: 1993-11-07
Abstract
Abstract A large pivotably mounted damper comprising a damper blade pivotable between two outlets in a duct. The blade, when in seating engagement with one outlet, leaves the other outlet completely open. In intermediate position between said outlets the damper directs hot gases in said duct to both of said outlets. Thus disastrous accidents cannot occur, since in either of the two seating positions, one outlet is completely open. The damper blade comprises an upper and lower wall. A means for equalizing the stress and the temperature in said walls includes a gas space co-extensive with the inner surface of said walls and a set of gas ports in open communication with the gases in said duct. Warpage is eliminated or minimized through the use of a heating fluid consisting of process gases directed through the gas space defined by the spaced apart walls of said blade. This contrasts with prior art techniques which used cooling fluids such as water or atmospheric air to cool damper blades. A novel means for moving the damper blade between seating and modulating positions and holding the blade under tension in seating is disclosed.
Inventors
- 👤 Peter W Burt
- 👤 Dean P Unthank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:04
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/04; F16K11/052; F22; F22B; F22B35/00; F22B35/007; F23; F23L; F23L11/00; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/877; Y10T137/87788; Y10T137/87812
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
269 words
Apparatus for controlling the flow of hot gases in a gas stream which includes: A. a duct having upstream and downstream portions, B. a damper blade, mounted entirely within said duct and movable between open and closed positions, said damper blade comprising: 1. a supporting frame, 2. metal plates mounted on both sides of said frame to form spaced apart walls; and 3. a nose portion at one end; C. the improvement in said damper blade of means for equalizing the stress on said walls and for equalizing the temperature of said walls relative to each other, which comprises: 1. a gas space, defined by said walls and by said frame for directing the flow of hot gases between said walls along the length of said damper blade for reinjection back into said gas stream, said gas space being: a. generally coextensive with said walls, and b. in direct heat exchange relation with said walls; and, 2. inlet ports in the nose portion of said damper blade and outlet ports at the opposite end of said damper blade said ports being in communication with said gas space and with said duct and serving as gas passages for the flow of a portion of said hot gases through said gas space, a. the further improvement wherein said inlet ports are in communication with the upstream portion of said duct for directing a portion of said hot gases into said gas space and outlet ports are in open communication with said downstream portion of said duct, so as to reinject said portion of said hot gases back into the gas stream.
Claim 2
Dependent Claim
269 words
Apparatus for controlling the flow of hot gases in a gas stream which includes: A. a duct having upstream and downstream portions, B. a damper blade, mounted entirely within said duct and movable between open and closed positions, said damper blade comprising: 1. a supporting frame, 2. metal plates mounted on both sides of said frame to form spaced apart walls; and 3. a nose portion at one end; C. the improvement in said damper blade of means for equalizing the stress on said walls and for equalizing the temperature of said walls relative to each other, which comprises: 1. a gas space, defined by said walls and by said frame for directing the flow of hot gases between said walls along the length of said damper blade for reinjection back into said gas stream, said gas space being: a. generally coextensive with said walls, and b. in direct heat exchange relation with said walls; and, 2. inlet ports in the nose portion of said damper blade and outlet ports at the opposite end of said damper blade said ports being in communication with said gas space and with said duct and serving as gas passages for the flow of a portion of said hot gases through said gas space, a. the further improvement wherein said inlet ports are in communication with the upstream portion of said duct for directing a portion of said hot gases into said gas space and outlet ports are in open communication with said downstream portion of said duct, so as to reinject said portion of said hot gases back into the gas stream.
Claim 3
Dependent Claim
15 words
metal plates mounted on both sides of said frame to form spaced apart walls; and
Claim 4
Dependent Claim
15 words
metal plates mounted on both sides of said frame to form spaced apart walls; and
Claim 5
Dependent Claim
62 words
A damper blade as defined in claim 1, the further improving in said supporting frame of: A. peripheral frame members, and, B. reinforcing frame members extending between and attached to said peripheral frame members, C. the futher improvement of openings in the web portions of said reinforcing frame members forming gas passages for the flow of heated gases through said gas spaCe.
Claim 6
Dependent Claim
112 words
inlet ports in the nose portion of said damper blade and outlet ports at the opposite end of said damper blade said ports being in communication with said gas space and with said duct and serving as gas passages for the flow of a portion of said hot gases through said gas space, a. the further improvement wherein said inlet ports are in communication with the upstream portion of said duct for directing a portion of said hot gases into said gas space and outlet ports are in open communication with said downstream portion of said duct, so as to reinject said portion of said hot gases back into the gas stream.
Claim 7
Dependent Claim
112 words
inlet ports in the nose portion of said damper blade and outlet ports at the opposite end of said damper blade said ports being in communication with said gas space and with said duct and serving as gas passages for the flow of a portion of said hot gases through said gas space, a. the further improvement wherein said inlet ports are in communication with the upstream portion of said duct for directing a portion of said hot gases into said gas space and outlet ports are in open communication with said downstream portion of said duct, so as to reinject said portion of said hot gases back into the gas stream.
Claim 8
Dependent Claim
36 words
a nose portion at one end; C. the improvement in said damper blade of means for equalizing the stress on said walls and for equalizing the temperature of said walls relative to each other, which comprises:
Claim 9
Dependent Claim
36 words
a nose portion at one end; C. the improvement in said damper blade of means for equalizing the stress on said walls and for equalizing the temperature of said walls relative to each other, which comprises:
Claim 10
Dependent Claim
45 words
A damper blade, as defined in claim 1, in which the nose of said blade is tapered and in which said inlet pports in said nose are directed toward the upstream portion of said duct, when said damper blade is in open and closed positions.
Claim 11
Dependent Claim
45 words
A damper blade, as defined in claim 1, the further improvement of a seating surface for said damper blade, which comprises: A. an inwardly projecting shoulder mounted on the inner walls of said duct; and, B. a high temperature resistant gasket mounted on said shoulder.
Claim 12
Dependent Claim
24 words
A damper blade, as defined in claim 4, in which said high temperature gasket comprises a plurality of fibrous forms of a nickel-chrome-iron alloy.
Claim 13
Dependent Claim
42 words
A damper blade, as defined in claim 4, the further improvement in said gasket of: A. a high temperature resistant packing, B. a braided outer high temperature resistant metal jacket, and, C. a mounting flap of metal extending tangentially from said jacket.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |