Patent ID: 6254362
Filing Date: 2001-07-03
Classification: F04C

Abstract:
A vacuum pump apparatus with a dust collecting function comprising:a vessel for processing which can be decompressed by a vacuum pump;a suction piping connected to said processing vessel;a vacuum pump operatively connected to said suction pump;a vacuum pump piping adapted to constitute a main exhaust operation path including the vacuum pump for exhausting gas;a gas discharge piping connected to said vacuum pump piping; anda dust separator connected directly to the vacuum pump in the main exhaust operation path;an auxiliary circulation path including a shut-off valve;wherein, during the period for exhaustion, an exhaust path is formed to allow exhaustion through the main exhaust operating path with the dust separator connected therein to be carried out, and, during the period in which the decompression by the vacuum pump is not necessary, the auxiliary circulation path is formed to constitute a circulation path together with the main exhaust operating path to carry out the collection of the dust.