Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Patent
1991-08-19
1994-03-29
Kamen, Noah P.
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
181204, F02B 7700
Patent
active
052975177
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates generally to noise suppression of engine driven equipment and more particularly to a system for reducing noise emitted from an engine enclosure with passive and active sound suppression.
BACKGROUND ART
Due to the ever increasing use of engine driven equipment, such as generator sets, environmental concerns are forcing the noise emitted from such equipment to be lower and lower. These generator sets are often used in areas where low noise is a requirement. Such uses include construction sites within residential areas, carnivals and movie sets. Thus, the market for sound suppression enclosures is increasing, and the premium charged for such enclosures is currently quite high. For example, the cost of some low noise enclosures is approximately equal to the cost of the engine and generator packages without an enclosure.
An example of an enclosure is disclosed in U.S. Pat. No. 3,462,949 issued to Howard R. Anderson, et al. on Aug. 26, 1969. An enclosure for a gas turbine engine is comprised of a silencer for the engine's compressor and a specially configured compressor inlet housing to provide uniform flow free of turbulence or separation. The enclosure is comprised of an inlet duct means for turning the incoming air through a plurality of right-angle bends, thus silencing any compressor noise.
Another example of an existing enclosure is disclosed in U.S. Pat. No. 4,071,009 issued to Jack H. Kraina on Jan. 31, 1978. The enclosure is mounted around the engine and is comprised of an outer enclosure having a horizontally disposed hood and side walls. An inner enclosure is disposed within the outer enclosure and has a horizontally disposed upper wall spaced vertically between the top of the engine and the hood to define first and second airflow passages therewith. An airflow guide means is secured internally on each of the sidewalls to define a passage therebetween which communicates with the second airflow passage. The hood, sidewalls and upper and forward walls of the inner enclosure each have a layer of sound absorbing material secured thereon.
An example of an existing enclosure is disclosed in U.S. Pat. No. Re. 29,923 issued to Gerhard Thien, et al. on Mar. 6, 1979. The soundproof casing is divided by at least one partition wall into two cooling air ducts separated from each other. One of the ducts contains all fuel carrying members of the engine, and the second duct contains the exhaust system of the engine.
The noise reduction enclosure defined herein reduces the noise emitted from engine driven equipment and provides noise reduction enclosure at an economical cost to the customer.
DISCLOSURE OF THE INVENTION
In one aspect of the invention, a noise reduction enclosure has been adapted for use with an engine. The noise reduction enclosure is comprised of a housing having a generally rectangular shape which surrounds the engine. The enclosure is divided into a duct portion and an engine portion defining an engine compartment. The enclosure further includes a housing having a generally rectangular shape surrounding the engine and is divided into a duct portion and an engine portion defining an engine compartment. The housing further includes a plurality of formed sheet material skins attached one to another. Each of the plurality of skins are relatively thin and at least a portion thereof have an inlet opening and an outlet opening therein. Each of the plurality of skins have an interior surface of which at least a portion of the interior surfaces are adjacent the engine. The enclosure further has a damping material and an absorptive material fixedly attached to at least a portion of the interior surfaces. The enclosure further includes an inlet duct having a preestablished length through which the cooling medium flows and is positioned within the housing. The inlet duct interconnects the inlet opening, through which the cooling medium enters, and the engine compartment. The enclosure further includes an outlet duct having a preestablished length, through which the
REFERENCES:
patent: Re29923 (1979-03-01), Thien et al.
patent: 3276539 (1966-10-01), Dear et al.
patent: 3462949 (1969-08-01), Anderson et al.
patent: 3642092 (1972-03-01), Cederbaum
patent: 3666042 (1972-05-01), Cederbaum
patent: 3949726 (1976-04-01), List
patent: 4048366 (1977-09-01), Kingsbury
patent: 4071009 (1978-01-01), Kraina
patent: 4702201 (1987-10-01), Odo et al.
patent: 5014660 (1991-05-01), Westerbeke, Jr.
PCT Application WO79/00011, Cederbaum Dated Jan. 1979.
Brandt Everett G.
Christensen M. Kathryn
Sahm W. Charles
Cain Larry G.
Caterpillar Inc.
Kamen Noah P.
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