The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2019
Filed:
Jun. 06, 2014
Applicant:
Edwards Japan Limited, Yachiyo-shi, Chiba, JP;
Inventors:
Assignee:
Edwards Japan Limited, Chiba, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04D 19/04 (2006.01); F04D 29/28 (2006.01); F04D 29/32 (2006.01); F04D 29/54 (2006.01); F04D 17/16 (2006.01); F04D 29/44 (2006.01);
U.S. Cl.
CPC ...
F04D 19/04 (2013.01); F04D 19/044 (2013.01); F04D 29/28 (2013.01); F04D 29/32 (2013.01); F04D 29/324 (2013.01); F04D 29/542 (2013.01); F04D 29/544 (2013.01); F04D 17/168 (2013.01); F04D 29/444 (2013.01); F05D 2240/122 (2013.01); F05D 2240/304 (2013.01); F05D 2250/70 (2013.01); F05D 2260/607 (2013.01);
Abstract
A vacuum pump is provided, which suppresses occurrence of a gas product in an exhaust side outlet of a thread groove and maintains pump performance over a long period. The vacuum pump includes inflow suppressing walls formed by widening greater an exhaust side end portion of ridge portions, extended along a gas exhaust direction on an outer circumferential surface of an inner circumference side stator, forward in a rotor rotating direction than an intake side end portion, the inflow suppressing walls suppressing retention of gas in exhaust side outlets of thread grooves engraved among the ridge portions.