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Title:
MUFFLER FOR DISCHARGE NOISE OF BLOWER
Document Type and Number:
Japanese Patent JPH10318194
Kind Code:
A
Abstract:

To provide a muffler which can effectively reduce a periodic high level noise caused by rotation of fins of a blower, and which can effectively reduce an exhaust noise from a supercharger used in particular in a marine engine.

In a muffler for an exhaust noise of a blower, a resonant cave part 36 is formed in the outer peripheral part of a blower exhaust passage 38, and a small hole 40 is formed in the inner wall of a passage, being communicated with the cave part 36. The volume of the resonant cave part 36, the cross-sectional area and the length of the small hole 40 are set so as to be dependent upon a resonant frequency in accordance with a rotating period of the blower. This muffler may be provided in the exhaust passage of the blower, which is coaxial with the exhaust turbine. A muffling duct unit 30 having the resonant cave part 36 with the small hole 40 being opened to the exhaust passage is removably attached to a supercharger outlet pipe or a tapered duct unit part, thereby the attachment of the unit 30 to an existing supercharger can be facilitated.


Inventors:
KAJIWARA SHUHEI
OTSU MASAKI
TAKEDA HIROSHI
Application Number:
JP14469397A
Publication Date:
December 02, 1998
Filing Date:
May 19, 1997
Export Citation:
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Assignee:
MITSUI SHIPBUILDING ENG
International Classes:
B63H21/14; F01N1/02; F02B33/44; F02M35/12; F04D23/00; F04D29/44; (IPC1-7): F04D29/44; B63H21/14; F01N1/02; F02B33/44; F02M35/12; F04D23/00
Attorney, Agent or Firm:
Yuichi Murakami (1 outside)



 
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