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Title:
MUFFLER FOR BLOWER
Document Type and Number:
Japanese Patent JP3854679
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: 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.
SOLUTION: 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.


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Inventors:
Fumiaki Ishida
Moritake Tsuyoshi
Koji Okada
Fujio Masayuki
Hiroshi Asabuki
Application Number:
JP2346397A
Publication Date:
December 06, 2006
Filing Date:
February 06, 1997
Export Citation:
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Assignee:
Hitachi Industrial Equipment Systems Co., Ltd.
Hitachi KEE Systems Inc.
International Classes:
F04D23/00; F04D29/58; F04D29/66; (IPC1-7): F04D23/00; F04D29/58; F04D29/66
Domestic Patent References:
JP8219098A
JP7083199A
JP7247992A
JP7054793A
JP55030994U
JP55035328U
JP5240192A
JP7083192A
JP7281497A
JP3031450U
JP63126512U
JP59194100A
Attorney, Agent or Firm:
Manabu Inoue
Katsuo Ogawa