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:
Jul. 09, 2024
Filed:
May. 15, 2020
Edwards Limited, Burgess Hill, GB;
Neil Turner, Burgess Hill, GB;
David Alan Turrell, Burgess Hill, GB;
Edwards Limited, Burgess Hill, GB;
Abstract
A multiple stage rotary vacuum pump comprising: a stator comprising multiple pumping stages; at least one inter-stage divider separating two adjacent pumping stages; the at least one inter-stage divider comprising two walls defining a cavity therebetween, an upstream wall bounding an upstream pumping stage and a downstream wall bounding a downstream pumping stage of the two adjacent pumping stages. The cavity comprising at least a portion of a pressure relief fluid flow path, the pressure relief fluid flow path providing a path from an outlet portion of the upstream stage towards an inlet portion of the upstream stage or towards an exhaust, the pressure relief fluid flow path comprising an orifice, the orifice comprising a valve seat; and a pressure relief valve configured to move between a compressed and an elongated state, the pressure relief valve sealing the orifice when in the elongated state and being configured to move to the compressed state such that the orifice is not obstructed, in response to pressure in the upstream stage rising above a predetermined value.