Seal structure with unidirectionally-rotatable three-dimensional L-shaped groove end face

Abstract

The invention discloses a seal structure with a unidirectional-rotatable three-dimensional L-shaped groove end face. The seal structure is characterized in that the sealing end face of a stationary ring or a rotating ring is provided with three-dimensional L-shaped grooves, wherein the three-dimensional L-shaped groove and the radial direction of the stationary ring or rotating ring have inclined angles of 20-70 degrees and are uniformly distributed along a circumferential direction; each three-dimensional L-shaped groove is composed of a flow-supplying groove and an unequal-deep rectangular tank, and each three-dimensional L-shaped groove is processed by adopting a grinding method so as to improve the fatigue strengthen, can be used for the seal structure with the rotating ring or the stationary ring as a compensation ring, and can also be used for face to face dual seal, back to back dual seal, two-stage series seal, three-stage series seal, combined seal of dual seal and single seal, or combined seal of the single seal and the two-stage seal; and if a low pressure exists at the outside of the seal and a high pressure exist at the inside of the seal, each three-dimensional L-shaped groove is also formed on the circumference surface of the inside of the seal. The seal structure provided by the invention has the advantages of realizing the larger kinetic pressure carrying capacity, reducing the frictional wear, prolonging the service life, and realizing the static seal of a sealing ring at a dike field.

Description

technical field [0001] The invention relates to a rotating shaft end face sealing structure, in particular to a one-way rotating three-dimensional L-shaped groove end face sealing structure. Background technique [0002] In conventional fluid machinery, such as centrifugal pumps, the rotating shaft seal is not under high working pressure, and ordinary mechanical seal devices can meet the working requirements. However, it is still a difficult problem to seal the rotary shaft of fluid machinery with high inlet pressure. [0003] The basic principle of fluid lubricated mechanical seal is to use hydrostatic pressure, hydrodynamic pressure or the combination of hydrodynamic and static pressure to separate the sealing surface with a fluid film on the order of microns, so as to achieve "zero leakage" under high pressure or high speed working conditions , and the seal has a long service life. In order to realize the hydrodynamic pressure effect, the general method is to design sha...

AI Technical Summary

Problems solved by technology

However, Chinese invention patent 02146449.9 has a complex groove shape, and special methods are required for manufacturing; Chinese invention patent 01102213.2 has two-way rotating spiral grooves. The hydrodynamic pressure effect of the positive convergent groove has an adverse effect; the three-dimensional groove shape proposed in Japanese patent 2006-009897 is easy to cause direct wear of the sealing end face due to insufficient oil supply when the inlet pressure suddenly increases, thus destroying The size of the wedge-shaped structure prevents it from working effectively as designed

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