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:
Jan. 10, 2023
Filed:
Jul. 19, 2019
Ebara Corporation, Tokyo, JP;
Tetsuji Kasatani, Tokyo, JP;
Shuichiro Honda, Tokyo, JP;
Ebara Corporation, Tokyo, JP;
Abstract
The present invention relates to a sealing system for a pump configured to pressurize a volatile liquid, such as liquid ammonia. The sealing system () includes a stuffing box () forming a barrier chamber () and a pump-side seal chamber (), a mechanical seal () arranged in the barrier chamber (), and a barrier-gas supply system () for supplying a barrier gas into the barrier chamber (). The barrier gas has a pressure higher than a pressure of the volatile liquid in the pump-side seal chamber (). The pump-side seal chamber () is located between an impeller () of the pump () and the mechanical seal (). The barrier-gas supply system () includes a pressure control valve () configured to maintain a constant difference between pressure in the barrier chamber () and pressure in the pump-side seal chamber ().