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Title:
MUFFLER FOR BLOWER
Document Type and Number:
Japanese Patent JPH10220390
Kind Code:
A
Abstract:

To reduce the size and the weight of a muffler by providing a blower having a blade with a reduced chamber by driving an electric motor by a frequency exceeding a commercial source frequency and a muffling passage chamber to absorb noise generated by a blower.

A vortex flow blower comprises a blower part B; and an electric motor part Mo rotate the blower part. The blower part B comprises a casing of which an impeller and a boosting passage consists. The impeller is rotated by the electric motor of the electric motor part M. After air sucked through a passage on the suction side is boosted by a booster, air is discharged from a passage on the suction side. In this case, by driving the electric motor by means of a frequency exceeding a commercial source frequency, the diameter of the blade of the impeller is reduced. Further, to absorb generating noise, the frequency of which is increased, of the blower part B, a muffling passage chamber, a muffling duct, a cooling air intake chamber 128, and an exhaust chamber 132 are arranged in a manner to cover the whole of the vortex flow blower and a muffler 120 consisting of a sound insulation cover 138 is provided.


Inventors:
ISHIDA FUMIAKI
MORITAKE TAKESHI
OKADA KOJI
FUJIO MASAYUKI
ASABUKI HIROSHI
Application Number:
JP2346397A
Publication Date:
August 18, 1998
Filing Date:
February 06, 1997
Export Citation:
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Assignee:
HITACHI LTD
HITACHI KEIYO ENG
International Classes:
F04D23/00; F04D29/58; F04D29/66; (IPC1-7): F04D23/00; F04D29/58; F04D29/66
Domestic Patent References:
JPH08219098A1996-08-27
JPH0783199A1995-03-28
JPH07247992A1995-09-26
JPH05240192A1993-09-17
JPH0754793A1995-02-28
JPS5530994U1980-02-28
JPS5535328U1980-03-06
JP3031450U1996-11-29
JPS63126512U1988-08-18
JPS59194100A1984-11-02
JPH0783192A1995-03-28
JPH07281497A1995-10-27
Attorney, Agent or Firm:
Ogawa Katsuo