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11. 发明专利

JPH074528A SEALING DEVICE 失效
公开(公告)号：JPH074528A
公开(公告)日：1995-01-10
申请号：JP23375793
申请日：1993-09-20
申请人： CRANE JOHN INC
发明人： JIEEMUZU AARU WATSUSERU , DAGURASU JIEI BOORUDEN , JIEEMUZU PII NETSUTSUERU
IPC分类号： F16J15/34 , F16J15/40
摘要： PURPOSE: To provide a seal satisfying regulation standard of toxic fluid emission matter and of low price and easy constitution, in an environment in which regulation is more and more strengthened toward zero emission. CONSTITUTION: A double, back to back oriented mechanical end face seal for use in sealing toxic or corrosive fluids having an intermediate buffer fluid chamber into which a relatively inert gas, such as nitrogen is provided for use as a buffer fluid. The nitrogen gas is maintained at a pressure which exceeds the process fluid pressure by at least 10 p.s.i. In a preferred embodyment, spiral pumping grooves 44 of the mating rings of the respective seals are shaped and dimensioned to pump the nitrogen buffer gas through the first seal 22 from the intermediate chamber into the process fluid chamber and through the second seal 24 from the intermediate chamber into the environment external to the housing 12 and sealing area, thereby avoiding the escape of the process fluid into the intermediate buffer chamber and to the atmosphere. Contamination of the process fluid by the buffer gas may be tolerated.

12. 发明专利

JPH06323442A SPIRAL GROOVE SEAL-ARRANGEMENT FOR HIGH VAPOR PRESSURE LIQUID 失效
公开(公告)号：JPH06323442A
公开(公告)日：1994-11-25
申请号：JP17675191
申请日：1991-07-17
申请人： CRANE JOHN INC
发明人： UEITAN RAI , GUREN JII PETSUTO
IPC分类号： F16J15/34
摘要： PURPOSE: To seal a housing and a shaft against the leakage of a high vapor- pressure liquid toy arranging two rings, a groove part having grooves and a lands, and a non-groove arranged dam part forming a dam. CONSTITUTION: A seal ring 76 has a seal surface 78. The seal surface 78 seals against the fitting face of an annular ring and comprises two rings, a groove part having grooves 80 and lands 82, and a non-groove arranged dam part forming a dam 84. The groove part has a radial dimension Dg along an arrow (r) and the land 82 has another radial dimension Dd . The circumferential width Wg of each spiral groove is same in its outside diameter of the seal surface 78. The circumferential width Wl of each land 82 is same in its outside diameter of the seal surface 78. The ratios W1 /Wg and Dd /Dg are both set to 3:1 so as to provide a superior seal gap.

13. 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.

14. 发明专利

JPH05231548A NON-CONTACT GAP MOLD SEAL WITH RING HAVING PATTERNIZED MICRODAM SEAL SURFACE 失效
公开(公告)号：JPH05231548A
公开(公告)日：1993-09-07
申请号：JP17674091
申请日：1991-07-17
申请人： CRANE JOHN INC
发明人： GUREN JII PETSUTO , JIYON HAMAKAA
IPC分类号： F16J15/34
摘要： PURPOSE: To minimize fluid leaks through gaps at both side of a mechanical face seal by microdams which provide a boundary to groove surface areas whereby the recess of each groove surface area bounded by the microdams acts as a unitary pressure zone. CONSTITUTION: A seal surface 78 of a seal ring 76 includes a groove area 80 and a microdam area 82, the dam area 82 being demarcated by a circle with diameter GD from the groove area 80. The groove area 80 includes a set of forward-facing grooves 84 and a set of backward-facing grooves 86, the grooves 84, 86 being separated by land areas 88. The grooves 84, 86 cross at individual polygon 90 which demarcates the surface of the groove area 80, and each polygon 90 including these crossing is divided by the microdam 92. The height of the microdam 92 is the same as those of the dam area 82 and the land area 88, and all the surfaces without the grooves are on the same plane.

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