This invention relates to mufflers for the exhaust of pneumatic tools in general, and more particularly for mechanized, jumbo mounted, percussive rock drills employed in the mining industry. The muffler consists of a casing of general prismatic shape, adapted for mounting on the drill. An inlet is present in the casing for receiving exhaust from the drill, the drill exhaust port and muffler inlet having the same cross-sectional area. Resilient rectangular baffles are mounted within the casing and are rigidly fastened at two opposite edges to the casing wall. The two other edges, which are longer than the fastened edges, are in contact with casing walls. Staggered holes are present in the baffles, so the gas flow through the muffler follows a sinusoidal path. The sides of the casing tapers down after the last baffle to a fraction of its height and then extend for a given length at the lessened height to form a narrow rectangular exhaust port. One face of the casing adjacent to the exhaust port consists of resilient sheet material. The flow of gas through the muffler causes strong vibration of the baffles and resilient face near the exhaust port. As a result, ice which may be formed within the muffler, cannot accumulate on the surfaces and any ice formed is expelled through the exhaust port.


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    Title :

    Muffler for Pneumatic Drill


    Contributors:
    A. Visnapuu (author) / S. E. Lay (author)

    Publication date :

    1977


    Size :

    14 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Muffler for Pneumatic Drill

    A. Visnapuu / S. E. Lay | NTIS | 1977


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