Vacuum pump

Patent metadata

Field	Value
Publication number	US-2016201675-A1
Application number	US-201614992549-A
Country	US
Kind code	A1
Filing date	Jan 11, 2016
Priority date	Mar 31, 2010
Publication date	Jul 14, 2016
Grant date	—

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

1 . A vacuum pump comprising:
rotary compressing elements in a casing, wherein the casing comprises
a cylinder chamber in which the rotary compressing elements slide,
an expansion chamber which makes a compressed air exhausted from the cylinder chamber to be expanded, and
an exhausting path which connects the cylinder chamber and the expansion chamber, and at least one turning part is provided in the exhausting path.

2 . The vacuum pump according to claim 1 , wherein
the exhausting path and the expansion chamber are adjacently provided at a peripheral part of the cylinder chamber in the casing.

3 . The vacuum pump according to claim 1 , wherein
a silence member formed of porous material is arranged in the exhausting path.

4 . The vacuum pump according to claim 1 , wherein
the casing comprises a cylindrical liner which forms the cylinder chamber, the cylindrical liner comprises an exhausting port which is connected to the exhausting path, a diameter of the exhausting port at an inside of the cylinder chamber is larger than a diameter of the exhausting port at an outside of the cylinder chamber, and the exhausting port is formed to a taper shape whose diameter is reduced from the inside to the outside.

5 . The vacuum pump according to claim 1 , wherein
a rotary shaft which drives the rotary compressing elements is comprised, and a front end part of the rotary shaft is supported with a bearing which is provided in the casing.

6 . A vacuum pump comprising:
rotary compressing elements in a casing, wherein the casing comprises:
a casing body which is formed of material whose thermal conductivity is higher than that of the rotary compressing elements, and
a cylinder part which is press fitted in the casing body and in which the rotary compressing elements slide.

7 . The vacuum pump according to claim 6 , wherein
the casing body and the cylinder part comprises a communicating hole which communicates with the cylinder part by penetrating through the casing body and the cylinder part, and while an inlet pipe is provided at the communicating hole, a front end of the inlet pipe is engaged with the communicating hole of the cylinder part.

8 . The vacuum pump according to claim 6 , wherein
the cylinder part is formed of a material which has a thermal expansion coefficient that is substantially equal to that of the rotary compressing elements.

9 . The vacuum pump according to claim 6 , wherein
in the casing body, the cylinder part is arranged at a position that is offset from the rotation center of the rotary compressing elements, and the expansion chamber that communicates with the cylinder part is formed at the peripheral part of the cylinder part at the side of the rotation center.

10 . 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.

11 . The vacuum pump according to claim 10 , 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.

12 . The vacuum pump according to claim 11 , wherein
the communicating hole is disposed at a position higher than the rotary shaft in the expansion chamber.

13 . The vacuum pump according to claim 10 , 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

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

• F04C25/02 Primary

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

• F04C2250/102

  of the outlet · CPC title

• B60T13/52

  indirect, i.e. vacuum booster units · CPC title

• F04C29/061

  Silencers using overlapping frequencies, e.g. Helmholtz resonators · CPC title