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.
MORITAKE TAKESHI
OKADA KOJI
FUJIO MASAYUKI
ASABUKI HIROSHI
HITACHI KEIYO ENG
JPH08219098A | 1996-08-27 | |||
JPH0783199A | 1995-03-28 | |||
JPH07247992A | 1995-09-26 | |||
JPH05240192A | 1993-09-17 | |||
JPH0754793A | 1995-02-28 | |||
JPS5530994U | 1980-02-28 | |||
JPS5535328U | 1980-03-06 | |||
JP3031450U | 1996-11-29 | |||
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JPH07281497A | 1995-10-27 |
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