The moving ring and its end face groove of the upstream pumping mechanical seal
A mechanical seal and moving ring technology, applied in the field of moving rings and their end face grooves, can solve the problems of reduced liquid film stiffness, reduced liquid film bearing capacity, unfavorable sealing stability, etc. The effect of improving the bearing capacity and increasing the area
Active Publication Date: 2015-09-09
NANJING FORESTRY UNIV
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Problems solved by technology
Relevant studies have shown that when the ratio of groove diameter to width is greater than 0.73, although the upstream pumping volume is still increasing, the stiffness of the liquid film decreases rapidly, which is not conducive to the stability of the seal; the pressure flow field simulation analysis of the pressure in the groove is carried out according to the FLUENT software , the pressure at the inlet of the inner diameter is the smallest, and the pressure at the end of the groove reaches the maximum, but there are negative pressures in some areas, which reduces the carrying capacity of the liquid film
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[0022] see figure 2 As shown in the moving ring 1 of the upstream pumping mechanical seal, the inner hole 11 of the moving ring has a diameter of 50mm and an outer diameter of 100mm. There are 12 combined grooves 3 on the sealing end face 2 of the moving ring, and each type of groove 3 is symmetrical to the axis of the moving ring. The inlet end of the groove communicates with the inner hole of the moving ring. The combined groove 3 includes a helical groove 31 and an arc groove 32 at the end of the helical groove. The inner side wall 311 and the outer side wall 312 of the spiral groove are logarithmic spirals, and the side wall of the arc groove 32 mainly includes an inner arc 321 and an outer arc 322 . The end of the inner wall 311 is tangent to the inner arc 321 extending inwardly of the spiral groove, the end of the outer wall 312 is tangent to the outer arc 322 extending inwardly of the spiral groove, the inner arc and the outer arc are smoothly connected to form an en...
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The technology provides a moving ring of an upstream pumping mechanical seal and a groove on the end face of the moving ring with better sealing effect. The end surface groove of the moving ring is a spiral groove whose inner and outer side walls are helical lines. The ends of the inner and outer side walls are respectively tangent to the inner arc and outer arc extending to the inner side of the spiral groove, and the inner arc and outer arc are connected. Forms the closed end of a facing slot. The moving ring has 8-15 moving ring end face grooves on the sealing end face of the moving ring, and each end face groove is symmetrical to the axis center of the moving ring.
Description
technical field [0001] The technology relates to an upstream pumping mechanical seal, specifically, a moving ring and an end face groove of an upstream pumping mechanical seal. Background technique [0002] The upstream pumping mechanical seal is a new type of non-contact end face seal based on modern hydrodynamic lubrication theory. There is a type groove on the end face of the moving ring opposite to the static ring, and the moving ring rotates relative to the static ring around the axis, and a small amount of isolation medium is pumped into the sealing chamber along the sealing end face by using the "end face pump" formed by the groove on the sealing end face of the moving ring , and form a stable liquid film between the end faces of the two sealing rings, thereby preventing the leakage of the sealed medium. Since the pressure of the sealed medium is higher than that of the isolated medium, and the flow direction of the isolated medium is from the low-pressure isolated m...
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IPC IPC(8): F16J15/16
CPCF16J15/3412
Inventor 孙见君马晨波王敏海乐檬李志宏李正新王鑫
Owner NANJING FORESTRY UNIV