Patent US3875745A successfully refreshed from Google Patents.
US3875745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Venturi exhaust cooler
Assignee: Atlas Copco Construction and Mining Technique AB
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Filing: 1973-09-10
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Granted: 1975-04-08
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Expires: 1993-09-10
Abstract
Abstract The kinetic energy of the exhaust gas from an internal combustion engine is utilized as a driving fluid to aspirate a large volume of quiescent ambient air as a driven fluid for cooling the exhaust gas quickly in a very short path of travel. This mode of operation is to be distinguished from conventional injector and ejector devices utilizing a current of air as the driving fluid. The present device utilizes the Coanda effect to introduce the exhaust gas around a lip on one end of a venturi tube, causing the gas to flow in a high velocity film adherent to the inner surface of the tube. This laminar flow draws in a large volume flow of air through the center of the venturi, cooling 1000.degree.F. exhaust gas down almost to ambient temperature in a distance of a few inches.
Inventors
- 👤 Nick F Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:26
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/05; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
210 words
A venturi exhaust cooler comprising a housing having an upstream end and a downstream end, cooling fins on the outside of said housing, an exhaust gas inlet connection in one side of said housing between said ends, an inturned flange on said upstream end forming an air inlet opening, a venturi tube having an upstream end and a downstream end, a curved outturned lip on said upstream end of said venturi tube spaced behind said housing flange, and means on the downstream ends of said housing and venturi tube for mounting said venturi tube in said housing, said housing and cooling fins extending substantially the full length of said venturi tube, the downstream end of said venturi tube being exposed to atmosphere and said venturi tube being removable through said downstream end of said housing for cleaning, said mounting means including longitudinal adjustment means to vary the spacing of said venturi tube lip behind said housing flange, and said housing forming an exhaust gas inlet chamber around said venturi tube causing exhaust gas from said chamber to follow the contour of said lip and tube in laminar flow under the Coanda effect and draw air through said inlet opening into the center of said tube to cool said exhaust gas.
Claim 2
Dependent Claim
210 words
A venturi exhaust cooler comprising a housing having an upstream end and a downstream end, cooling fins on the outside of said housing, an exhaust gas inlet connection in one side of said housing between said ends, an inturned flange on said upstream end forming an air inlet opening, a venturi tube having an upstream end and a downstream end, a curved outturned lip on said upstream end of said venturi tube spaced behind said housing flange, and means on the downstream ends of said housing and venturi tube for mounting said venturi tube in said housing, said housing and cooling fins extending substantially the full length of said venturi tube, the downstream end of said venturi tube being exposed to atmosphere and said venturi tube being removable through said downstream end of said housing for cleaning, said mounting means including longitudinal adjustment means to vary the spacing of said venturi tube lip behind said housing flange, and said housing forming an exhaust gas inlet chamber around said venturi tube causing exhaust gas from said chamber to follow the contour of said lip and tube in laminar flow under the Coanda effect and draw air through said inlet opening into the center of said tube to cool said exhaust gas.
Claim 3
Dependent Claim
37 words
An exhaust cooler as defined in claim 1, said mounting means comprising flanges on said downstream ends of said housing and venturi tube, and screws securing said flanges together, said adjustment means comprising shims between said flanges.
Claim 4
Dependent Claim
24 words
An exhaust cooler as defined in claim 1, said mounting and adjustment means comprising a screw threaded connection between said housing and venturi tube.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |