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:
Aug. 06, 2013
Filed:
Oct. 09, 2009
Nigel Paul Schofield, Horsham, GB;
Stephen Dowdeswell, Cuckfield, GB;
Nigel Paul Schofield, Horsham, GB;
Stephen Dowdeswell, Cuckfield, GB;
Edwards Limited, , GB;
Abstract
A Roots vacuum pump stator is arranged to house a pair of intermeshing rotors, said stator being characterized in that it comprises a director or deflector arranged to direct solid material entrained in a gas pumped through the pump towards the outlet. In other words, the stator according to the present invention has a means for directing or deflecting powder or solid material entrained in a gas being pumped directly towards an outlet of the pump or out of the pump. The directing means can comprise a channel disposed between the arcuate surface and the outlet, said channel comprising a portion that engages the arcuate surface prior to the bottom-dead-centre position and which extends away from the rotor's axis of rotation towards the pump outlet. Thus, powder entrained in the pumped gas is effectively removed from pumping volume in a way which reduces the likelihood of any solid material causing the pump to seize: the channel can be arranged so that the solid material is 'flung' towards the outlet or away from a meshing zone where rotors mesh with one another.