US3805884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damper means for controlling the flow of gas to a heat exchanger
Assignee: VOGT H MACHINE CO Inc
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Filing: 1973-01-08
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Granted: 1974-04-23
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Expires: 1993-01-08
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
- 👤 P Burt
- 👤 D Unthank
- 👤 R Precious
- 👤 C Newhall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:11
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: 23
Claim 1
Independent Claim
234 words
A damper in combination with a duct in open communication with a source of hot gases and having: A. a first outlet in communication with a bypass stack, and, B. a second outlet in communication with a heat exchanger, C. the improvement which comprises: 1. a single damper blade pivotably mounted within said duct for movement between: a. a first position wherein said first outlet is closed and the second outlet to the heat exchanger is open, b. a second position whereby said second outlet is closed and the first outlet to the bypass stack is open, c. a third modulating position at intermediate points between said first and second positions whereby the flow of gases through said duct is directed to both first and second outlets. d. said damper comprising: 1. spaced apart upper and lower walls, 2. means for equalizing the temperature of said walls relative to each other which comprises: a. a gas space defined by said walls and in heat exchange therewith, and, b. inlet and outlet ports in said damper blade in open communication with said gas space and with said duct for passage of hot gases from said duct through said gas space, 1. the further improvement in which said inlet ports are in open communication with the upstream portion of said duct; and, D. means for moving said damper blade between said first, second and third positions.
Claim 2
Dependent Claim
234 words
A damper in combination with a duct in open communication with a source of hot gases and having: A. a first outlet in communication with a bypass stack, and, B. a second outlet in communication with a heat exchanger, C. the improvement which comprises: 1. a single damper blade pivotably mounted within said duct for movement between: a. a first position wherein said first outlet is closed and the second outlet to the heat exchanger is open, b. a second position whereby said second outlet is closed and the first outlet to the bypass stack is open, c. a third modulating position at intermediate points between said first and second positions whereby the flow of gases through said duct is directed to both first and second outlets. d. said damper comprising: 1. spaced apart upper and lower walls, 2. means for equalizing the temperature of said walls relative to each other which comprises: a. a gas space defined by said walls and in heat exchange therewith, and, b. inlet and outlet ports in said damper blade in open communication with said gas space and with said duct for passage of hot gases from said duct through said gas space, 1. the further improvement in which said inlet ports are in open communication with the upstream portion of said duct; and, D. means for moving said damper blade between said first, second and third positions.
Claim 3
Dependent Claim
60 words
means for equalizing the temperature of said walls relative to each other which comprises: a. a gas space defined by said walls and in heat exchange therewith, and, b. inlet and outlet ports in said damper blade in open communication with said gas space and with said duct for passage of hot gases from said duct through said gas space,
Claim 4
Dependent Claim
60 words
means for equalizing the temperature of said walls relative to each other which comprises: a. a gas space defined by said walls and in heat exchange therewith, and, b. inlet and outlet ports in said damper blade in open communication with said gas space and with said duct for passage of hot gases from said duct through said gas space,
Claim 5
Dependent Claim
57 words
A damper, as defined in claim 1, the further improvement of a seating surface for said damper blade when in its first position of: A. an inwardly projecting shoulder mounted on the walls of said duct at the mouth of said outlet to said bypass stack, and, B. a high temperature resistant gasket mounted on said shoulder.
Claim 6
Dependent Claim
38 words
a cam follower in operative relation with said camming face so that movement of said clevis and of said cam opens and closes said limit switch as said cam follower moves from one camming face to the other.
Claim 7
Dependent Claim
38 words
a cam follower in operative relation with said camming face so that movement of said clevis and of said cam opens and closes said limit switch as said cam follower moves from one camming face to the other.
Claim 8
Dependent Claim
24 words
A damper, as defined in claim 2, in which said high temperature resistant gasket comprises a plurality of fibers fabricated of a nickel-chrome-iron alloy.
Claim 9
Dependent Claim
41 words
A damper, as defined in claim 2, 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.
Claim 10
Dependent Claim
58 words
A damper, as defined in claim 1, the further improvement of a seating surface for said damper blade, when in its second position, of: A. an inwardly projecting shoulder mounted on the inner wall of said duct at the mouth of the outlet to said heat exchanger, and, B. a high temperature resistant gasket, mounted on said shoulder.
Claim 11
Dependent Claim
24 words
A damper, as defined in claim 5, in which said high temperature resistant gasket comprises a plurality of fibers fabricated of a nickel-chrome-iron alloy.
Claim 12
Dependent Claim
41 words
A damper, as defined in claim 5, 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.
Claim 13
Dependent Claim
78 words
A damper, as defined in claim 1, the improvement in said means for moving said damper which comprises: A. a first motive means in operative connection with the upper wall of said damper blade, B. a second motive means in operative connection with the lower wall of said damper blade; C. power transmission means for driving said first and second motive means in co-ordinated movement; and, D. a prime mover in operative relation with said power transmission means.
Claim 14
Dependent Claim
43 words
A damper, as defined in claim 8, the further combination with said first and second motive means of: A. spring means applied to said first and second motive means to apply biasing tension to the upper and lower walls of said damper blade.
Claim 15
Dependent Claim
99 words
A damper, as defined in claim 8, in which: A. said first motive means comprises a first cable trained over a tensioning sheave and connected to the upper wall of said damper blade, B. said second motive means comprises a second cable trained over a tensioning sheave and connected to the lower wall of said damper blade, and, C. said power transmission means comprises a driven shaft containing a driven sheave for each of said cables, said shaft when driven in one direction unwinding one cable from its driven sheave and winding the other cable onto its driven sheave.
Claim 16
Dependent Claim
56 words
A damper, as defined in claim 10, the further combination therewith of: A. a supporting frame for said power transmission means and for said first and second motive means; B. supporting frame members for the tensioning sheaves for said cables for said first and second motive means; C. a clevis for each of said tensioning sheaves,
Claim 17
Dependent Claim
32 words
A damper, as defined in claim 11, the further combination therewith of: A. a longitudinal slot in said supporting frame member, said slot serving as a slidable bearing surface for said clevis.
Claim 18
Dependent Claim
78 words
A damper, as defined in claim 11, the further combination of: A. a switch in operative relation with said prime mover and responsive to the position of said damper blade; B. an actuating device mounted on said clevis in operative relation with said switch; C. whereby longitudinal movement of said clevis and said actuating device responsive to the forces of said spring and to the forces of said power transmission means acts to open and close said switch.
Claim 19
Dependent Claim
47 words
A damper, as defined in claim 13, the further improvement in which said actuating device is a cam, comprising: A. an elongated flat camming face, and, B. an inclined camming face at one end, C. the further improvement in said switch is a limit switch which comprises:
Claim 20
Dependent Claim
28 words
A damper, as defined in claim 14, in which the length of said cam approximates the length of the longitudinal movement of said clevis and of said cam.
Claim 21
Dependent Claim
44 words
A damper, as defined in claim 14, in which: A. said flat face of said cam operates to hold said limit switch closed, and, B. said inclined face at the end of said cam operates with said cam follower to open said limit switch.
Claim 22
Dependent Claim
87 words
A damper, as defined in claim 16, the improvement in which: A. one of said tensioning clevises responds to continued unwinding of its associated cable from its driven sheave when said damper is in seated condition, by movement responsive to decreased tension on its cable; B. and which maintains said limit switch closed by contact of said cam follower against the flat face of its associated cam but opens said limit switch when said cam follower reaches said inclined camming face at the end of said cam.
Claim 23
Dependent Claim
124 words
A damper, as defined in claim 17, the improvement in which: A. one tensioning clevis responds to continued winding of its associated cable onto its driven sheave when said damper is in seated condition by movement responsive to increased tension on said cable; and, B. increases the compression on its associated spring and the tension of said seated damper against its seat; and, C. its associated cam, mounted on said tensioning clevis, holds its limit switch closed by contact of the cam follower of said limit switch against the flat face of its associated cam; and, D. said prime mover is stopped by opening of the other limit switch by movement of said other tensioning clevis and the cam as defined in claim 17.
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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |