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:
Jun. 01, 2010
Filed:
Jul. 15, 2005
Satoshi Fujiwara, Sanda, JP;
Mitsuru Kudari, Sanda, JP;
Masanobu Ninomiya, Sanda, JP;
Nippon Pillar Packing Co., Ltd., Osaka, JP;
Abstract
The present invention provides a static pressure type non-contact gas seal which, even when supply of seal gasto the space between sealing end surfacesandhas stopped unexpectedly, can be safely used with no possibility that the sealing end surfacesandcollide severely against each other and consequently the sealing end surfacesandare damaged or destructed. In this static pressure type non-contact gas seal, the seal gasis supplied to the space between the sealing end surfacesandfrom a seal gas passage, thereby generating an opening force that acts on the stationary sealing ringin a direction that the space between the sealing end surfacesandis opened. An annular-spaced back pressure chamberblocked by two O-ringsandis formed between the facing peripheral surfaces of a seal caseand the stationary sealing ring, to introduce the seal gasto be supplied to the seal gas passageinto the back pressure chamber, thereby generating a closing force that maintain the balance with the opening force, as a back pressure acting on the stationary sealing ring. A spring is not used as a means for generating the closing force.