Title:
POSITIVE DISPLACEMENT DRY VACUUM PUMP
Document Type and Number:
WIPO Patent Application WO/2011/039812
Kind Code:
A1
Abstract:
A decompression chamber (3) of a positive displacement dry vacuum pump (1) can be communicated with a site (16a) of the suction side of a third-stage pump chamber (16) of a pump body (2) through a second hose (5) and a second vacuum valve (7), and can be communicated with a site (18b) of the exhaust side of a final-stage pump chamber (18) through a first hose (4) and a first vacuum valve (6). During the drive, the second vacuum valve (7) is opened only for a predetermined time period to evacuate the decompression chamber (3), and the first vacuum valve (6) is then opened to evacuate the pump body (2) side using the decompression of the decompression chamber (3), causing the drive load to be reduced. Pump power consumption can be reduced without the need for an auxiliary pump by repeating the evacuation of the decompression chamber (3), and the evacuation of the pump body (2) side using the decompression chamber (3).
Inventors:
OZAWA OSAMU (JP)
HANAOKA TAKASHI (JP)
IWANE MATSUMI (JP)
HANAOKA TAKASHI (JP)
IWANE MATSUMI (JP)
Application Number:
PCT/JP2009/005055
Publication Date:
April 07, 2011
Filing Date:
September 30, 2009
Export Citation:
Assignee:
KASHIYAMA IND LTD (JP)
OZAWA OSAMU (JP)
HANAOKA TAKASHI (JP)
IWANE MATSUMI (JP)
OZAWA OSAMU (JP)
HANAOKA TAKASHI (JP)
IWANE MATSUMI (JP)
International Classes:
F04C25/02; F04B37/16
Foreign References:
| JP2004052759A | 2004-02-19 | |||
| JP2009534574A | 2009-09-24 | |||
| JP2007502932A | 2007-02-15 | |||
| JP2007056764A | 2007-03-08 |
Attorney, Agent or Firm:
YOKOZAWA, Shiro (JP)
Shiro Yokozawa (JP)
Shiro Yokozawa (JP)
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