专利内容由知识产权出版社提供
专利名称：Sealing system for use in composite multi-stage pump
发明人：Shiro Takano,Toshio Jojima,Hajime
Oshida,Tadashi Yokoi,Muneo Kato,TadashiKoizumi
申请号：US05/823100申请日：19770809公开号：US04121839A公开日：19781024
摘要：A sealing system for use in a composite multi-stage pump or pumps is disclosedwhich utilizes part of the liquid pressurized by the pump to moderate sealing conditionsby introducing said liquid to a portion or portions around the shaft, where the sealingconditions are most critical, and by thus reducing the pressure imposed on the sealingportion make the designing of seals easy. Also, by introducing pressurized liquid ofrelatively low temperature to the critical portion(s), minimum flow rate is lowered andthus the operational range of the pump is extended.< P>
When two or more pumps are employed for maintaining continuous operation byalternately switching the working pumps, a flow passage is provided between the pumpsso the pressurized liquid from the pump under operation can be introduced to the non-operating pump, thus utilizing the pressurized liquid to prevent liquid kept underpressure in the non-operating pump from leaking therefrom.
申请人：MITSUI TOATSU CHEMICALS, INC.
代理机构：Oblon, Fisher, Spivak, McClelland & Maier
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