Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1994-08-19
1996-10-08
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181264, 181282, F01N 302
Patent
active
055633820
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a silencer for compressed air.
BACKGROUND OF THE INVENTION
A silencer of this type is disclosed in U.S. Pat. No. 3,361,227. The silencer described and illustrated in said patent is particularly suitable for silencing the exhaust sound from a combustion engine. Because the efficiency of combustion engines is of considerable importance, a balance must be sought between silencing of the sound and impedance of the gas flow. Silencing of pans of the audio spectrum which are not covered by the silencer in question is provided by additional silencers connected up- or downstream. The effort involved in this type of construction is, on the one hand, justified by the reduced loss which occurs as a result and, on the other hand, possible because, especially in vehicles, a long length is available for the installation of such silencers.
Silencers of this type are unsuitable for compressed air compressors. In the prior art silencers lined with sound-absorbent material are used for compressed air compressors. Silencers of this type have the advantage that a broad audio spectrum can be covered by a single silencer. In this context efficient silencing is more important than the impedance of the gas flow because it is possible to compensate for losses in flow in a simple manner, for example by increasing the power of the motor which drives the compressor. However, the use of silencers lined with glass wool or another absorbent material has the disadvantage that silencers of this type can no longer be cleaned such that they meet the demands of the foodstuffs industry and hospitals. Frequently the minimum requirement for these sectors is that the silencers can be sterilised of flushed with a liquid disinfectant.
OBJECT OF THE INVENTION
The object of the present invention is to provide a silencer which does not have the abovementioned disadvantages.
SUMMARY OF THE INVENTION
The invention is based on the perception of incorporating only plates, baffles and other components which can be sterilised easily. In addition, the design of the sound-absorbent element is such that silencing of, in particular, the low frequency sound produced by the compressor can be provided to a great extent. According to an advantageous embodiment of the invention, the free cross-sectional surface area between the plate and the housing makes up between 8 and 12% of the given total cross-sectional surface area. Although the gap between housing and plate can be provided locally or as a gap extending around the circumference, according to an advantageous embodiment of the invention plates are fitted at a distance from the housing on two opposite sides of the transverse baffle.
Further silencing means, comprising a transverse element which extends from the longitudinal centre line perpendicularly thereto at least on one side terminates at a distance away from the housing, the transverse element being provided at said end on said side with a plate element extending in the direction of the outlet, are present for further absorption of the sound. An additional silencing chamber is formed by this means. The two U-shaped silencers formed in this way can be located some distance apart or can adjoin one another. If said silencers are some distance apart, an intermediate baffle can be placed between them, which, in its turn, delimits two further chambers. In order to provide adequate silencing coupled, on the other hand, with optimum use of the space in the housing, according to an advantageous embodiment of the invention the length of the plate is at least 10% of the total length of the housing.
Optimum silencing is provided by this means. For silencing high frequency sound, sieve baffles containing openings can be filled between the plate-shaped elements and extending essentially perpendicular thereto. For optimum silencing of high frequency sound it proves advantageous to install at least three such baffles horizontally some distance apart, the mutual spacing between the baffles decreasing towar
REFERENCES:
patent: 2043030 (1936-06-01), Bourne
patent: 2490493 (1949-12-01), Wade
patent: 3361227 (1968-01-01), Kaari
patent: 4011922 (1977-03-01), Goplen
patent: 4079809 (1978-03-01), Visnapuu et al.
Dang Khanh
Q.E. International B.V.
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