US3799502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable venturi throat for the purification of blast furnace gases
Assignee: Verfahrenstechnik Dr Ing Kurt Baum
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Filing: 1972-07-10
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Granted: 1974-03-26
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Expires: 1992-07-10
Abstract
Abstract This disclosure teaches an adjustable venturi throat for dust purification of blast furnace gases, operating at up to sonic velocities with a substantially constant pressure drop, adjusted by dampers having a length of approximately one half the width of the throat. In a preferred embodiment the dampers are streamlined in shape, with the narrower ends swinging in mirror images to form a nozzle curve. The ends may be adapted to form a rollertype closure when the dampers are fully closed.
Inventors
- 👤 J Baum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:33
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/002; B; B01; B01D; B01D47/00; B01D47/10; C21B2100/00; C21B2100/40; C21B2100/44
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the dampers having an adjustable length equal at its maximum to approximately one half the width of the throat.
Claim 2
Dependent Claim
68 words
A venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the dampers having an adjustable length equal at its maximum to approximately one half the width of the throat.
Claim 3
Dependent Claim
42 words
A venturi apparatus according to claim 1 wherein each of the dampers is streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivot in mirror-image relationships, positioning of the unmounted ends creating the throat.
Claim 4
Dependent Claim
19 words
A venturi apparatus according to claim 2 wherein the dampers have a closure angle of between 60* and 90*.
Claim 5
Dependent Claim
43 words
A venturi apparatus according to claim 3 wherein the unmounted end of each damper is adapted for cooperatively rolling with the unmounted end of the other damper of the pair to the final closed position of the dampers to form a roller-type closure.
Claim 6
Dependent Claim
46 words
A venturi apparatus according to claim 4 with the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.
Claim 7
Dependent Claim
184 words
A venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the dampers having an adjustable length equal at its maximum to approximately one half the width of the throat, each of the dampers streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivoting in mirror-image relationships, positioning of the unmounted ends creating the throat, the dampers having a closure angle of between 60* and 90*, the unmounted end of each damper adapted for cooperatively rolling with the unmounted end of the other damper of the pair to the final closed position of the dampers to form a roller-type closure, the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.
Claim 8
Dependent Claim
184 words
A venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the dampers having an adjustable length equal at its maximum to approximately one half the width of the throat, each of the dampers streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivoting in mirror-image relationships, positioning of the unmounted ends creating the throat, the dampers having a closure angle of between 60* and 90*, the unmounted end of each damper adapted for cooperatively rolling with the unmounted end of the other damper of the pair to the final closed position of the dampers to form a roller-type closure, the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.
References Cited (Backward Citations)
US1357440A
Cited
US1543637A
Cited
US2067120A
Cited
US3160385A
Cited
US3378226A
Cited
US3444669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |