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:
May. 09, 2017
Filed:
Mar. 01, 2013
Hitachi, Ltd., Tokyo, JP;
Taiji Hashimoto, Tokyo, JP;
Tao Hu, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a centrifugal steam compressor having sealing water discharge at pressure higher than atmospheric pressure, a simple structure in which a high-pressure piping system is omitted as much as possible from a sealing water circulation system is realized. A shaft seal systemis capable of supplying high-pressure sealing water and low-pressure sealing water. The shaft seal system has a circulating water reservoirto store circulating water, a positive displacement pumpto suck the circulating water from the reservoir, and is capable of supplying the sealing water to a first pressure regulating valveprovided in a high-pressure side sealing water lineof a centrifugal compressorand a second pressure regulating valveprovided in a low-pressure side sealing water lineof the centrifugal compressor, an accumulatorprovided between the positive displacement pump and the first and second pressure regulating valves, return pipingsandto return the sealing water, which water-seals seal means of the centrifugal compressor, to the circulating water reservoir, and depressurization meansandinterpositioned in the middle of the return pipings.