A two -way rotating fluid dynamic pressure -type mechanical seal structure

Abstract

The invention provides a hydrodynamic-type mechanical sealing structure capable of rotating in two directions. The front end face of the mechanical sealing structure is a sealing surface which is composed of an outer ring (1), an inner ring (2), a sealing weir area (3), a sealing dam area (4) and dynamic-pressure-type grooves (5); all the components are located at different positions of the frontend face, namely the sealing surface, of the mechanical sealing structure. According to the hydrodynamic-type mechanical sealing structure, the dynamic-pressure-type grooves are evenly formed in the circumferential direction of the sealing end face, a specific rotation direction does not need to be required, bidirectional rotation can be achieved, the hydrostatic effect is effectively improved through the dynamic-pressure-type grooves during running, the side effect caused by the unevenness of the mechanical sealing end face is reduced, and the working efficiency of mechanical sealing is improved; the whole grooves have a certain fluid static pressure effect, and under the fluid static pressure effect, mechanical sealing has a certain opening force in a static state; collision, wear and efficacy loss under extreme working conditions of low film thickness and low pressure difference can be effectively avoided, non-contact of sealing is achieved, the wear resistance is improved, the service life is prolonged, and the sealing reliability is improved.

Description

technical field [0001] The invention provides a fluid dynamic pressure mechanical seal structure capable of bidirectional rotation, specifically, a certain number of dynamic pressure grooves are set on the end face of the moving ring or the static ring, which belongs to the rotary shaft seal in the fluid seal. technology field. Background technique [0002] The mechanical seal is an axial end face sealing device that relies on the elastic element to preload the dynamic and static ring end face seal pairs and compress the medium pressure and the elastic element pressure to achieve sealing, so it is also called end face seal. Mechanical seals are widely used in equipment such as centrifugal pumps, centrifuges, reactors and compressors. With the rapid development of the industrial field, in practical applications, mechanical seals are required to be able to adapt to extreme working conditions such as high pressure, high speed, and sudden changes, which puts forward higher requ...

AI Technical Summary

Problems solved by technology

But there are a lot of shortcomings, such as the inability to form a stable liquid film between the end faces of the traditional contact mechanical seal, the wear of the end face, the thermal crack of the sealing ring, etc., which will easily lead to the failure of the seal.

Non-contact seals, such as spiral groove mechanical seals that are widely used at present, are mainly modified on the end face of the dynamic or static ring (deep groove type, shallow groove type, and textured type), and these structures improve to a certain extent. The performance of the mechanical seal is improved, but the leakage is greater than that of the ordinary end face mechanical seal of the same specification. At the same time, the chip removal performance is poor during work, which is easy to cause the accumulation of particles.

For the textured structure, there are poor pressure resistance, insufficient fluid film thickness between the end faces, or insufficient rigidity of the fluid film to resist external interference, resulting in abnormal and stable operation of the sealing system and poor chip removal ability.

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