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Title:
ROOTS TYPE FLUID MACHINE
Document Type and Number:
Japanese Patent JP2012021450
Kind Code:
A
Abstract:

To provide a roots type fluid machine capable of reducing the leak of a gas from an axial gap.

In the roots type pump having slight axial gaps between the rotor axial end surfaces 36AB and 36BB of a pair of rotors 36 and the internal wall of a case 2 opposite to the rotor axial end surfaces 36AB and 36BB, guide grooves 50 comprising an arclike groove 50A and a radial groove 50B and communicating with a transfer chamber 40 are provided opposite to the rotors 36A and 36B on the internal wall of the case 2 to introduce a gas flowing in the axial gaps to the transfer chamber 40. A pair of the rotors 36 are also provided with communication grooves 55 extending radially from the center of the rotation shafts 8A and 8B on the rotor axial end surfaces 36AB and 36BB to enable wider range communication with the transfer chamber 40 to introduce the gas flowing in the axial gaps to the transfer chamber 40.


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Inventors:
IZAWA YUYA
YAMAMOTO SHINYA
BAN TAKASHI
IMAI TAKAYUKI
YAMASHITA KATSUMI
HANAOKA YASUNAKA
Application Number:
JP2010159389A
Publication Date:
February 02, 2012
Filing Date:
July 14, 2010
Export Citation:
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Assignee:
TOYOTA IND CORP
International Classes:
F04C18/18; F04C25/02; F04C27/02
Domestic Patent References:
JPS6390690A1988-04-21
JP2002221177A2002-08-09
JP2004270545A2004-09-30