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US 9,255,579 B2Granted
Vacuum pump having rotary compressing elements
AssigneeNabtesco Automotive Corporation
InventorsYoshihiro Mitsuhashi, Katsunori Tanaka, Hiroyuki Murakami, Kouji Takahashi, Taku Kawakami, Ichiro Minato
Life of this patent
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Abstract
It is intended to provide a vacuum pump so that without upsizing the vacuum pump, noise and vibration are reduced, heat dissipation property is secured, and the casing is downsized. Therefore, at least one turning part is provided in an exhausting path formed in a casing body. The casing body is formed of a material whose thermal conductivity is higher than that of a rotor and vanes, and a cylinder part where the vanes slide is press fitted in the casing body.
Claims5
A vacuum pump comprising:
- rotary compressing elements in a casing,
- wherein the casing comprises a casing body in which a cylinder chamber in which the rotary compressing elements slide is formed, an exhausting path which connects the cylinder chamber and an exhausting port, and an expansion chamber which is formed in the exhausting path,
- the expansion chamber is provided at a peripheral part of the cylinder chamber in the casing body, and
- a resonance chamber which is branched from the exhausting path is connected to the expansion chamber and is positioned in a different position along the peripheral part of the cylinder chamber from the exhausting path.
1 more element
Dependencies are inferred from the claim text.