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1. 发明专利

JPH0666374A SURFACE SEAL HAVING DOUBLE SPIRAL GROOVE 失效
公开(公告)号：JPH0666374A
公开(公告)日：1994-03-08
申请号：JP7677593
申请日：1993-04-02
申请人： CRANE JOHN INC
发明人： UEIITAN REI
IPC分类号： F16J15/34
摘要： PURPOSE: To provide a mechanical face seal improved by using double spiral groove structure to minimize abrasion and leakage. CONSTITUTION: This is a mechanical face seal for a high speed rotating fluid pressure device arranged in a housing and including rotating and stationary seal rings having radial seal surfaces inclined and facing against each other by being engaged with each other under normal conditions. Sets of spiral grooves 71 inclined to the opposite side are manufactured on a seal surface of one of the rings, the set functions to deliver fluid from a receiver between the seal surfaces in a uniform current by a pump and the other set functions to deliver fluid between the surfaces reversely to the receiver in a backflow by the pump. Respective uniform current pumping grooves favourably cross only with one backflow pumping groove 73. Fluid pressure between the surfaces forms a clearance between them, and groove structure inclined in reverse minimizes a loss of fluid, that is, leakage.

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