Rotary pump having a casing being formed with a communicating hole communicating a space that is between the side plate and the wall surface of the driving machine

Patent metadata

Field	Value
Publication number	US-9709057-B2
Application number	US-201614992549-A
Country	US
Kind code	B2
Filing date	Jan 11, 2016
Priority date	Mar 31, 2010
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

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.

First claim

The invention claimed is:

1. A vacuum pump, comprising:
a casing attached to a wall surface of a driving machine;
a rotor configured to be rotationally driven by a rotary shaft of the driving machine in the casing; and
a plurality of vanes accommodated in the rotor so as to be extendable therefrom,
wherein the casing includes a hollow cylinder chamber in which the rotor is rotationally driven and a side plate which closes an opening provided at an end of the cylinder chamber, and
wherein the casing is formed with a communicating hole which communicates a space which is formed between the side plate and the wall surface of the driving machine with another space whose pressure is equal to or higher than the atmospheric pressure.

2. The vacuum pump according to claim 1 , wherein
the casing is formed with an expansion chamber disposed in an exhausting path communicating the cylinder chamber with an exhausting port at a peripheral part of the cylinder chamber, and
the communicating hole is formed in the expansion chamber.

3. The vacuum pump according to claim 2 , wherein
the communicating hole is disposed at a position higher than the rotary shaft in the expansion chamber.

4. The vacuum pump according to claim 1 , wherein
the driving machine includes a bearing which pivotally supports the rotary shaft, and
the communicating hole is formed on the wall surface at a position higher than the bearing.

Assignees

• Nabtesco Automotive Corp

Inventors

• Mitsuhashi Yoshihiro
• Tanaka Katsunori
• Murakami Hiroyuki
• Takahashi Kouji
• Kawakami Taku
• Minato Ichiro

Classifications

• F04D19/04

  specially adapted to the production of a high vacuum, e.g. molecular pumps · CPC title

• F04C29/00

  Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00 · CPC title

• F04C29/068

  the silencing means being arranged inside the pump housing · CPC title

• F04C25/02 Primary

  for producing high vacuum (sealing arrangements F04C27/00; silencing F04C29/06) · CPC title

• F04C2240/605

  Shaft sleeves or details thereof · CPC title