A mechanical seal end face structure with variable depth helical T-shaped groove

Abstract

The invention discloses a mechanical seal end face structure of a variable-depth spiral T-shaped groove, which includes a moving ring and a static ring of the mechanical seal. On the downstream side, a variable-depth spiral T-shaped groove is provided on the end surface of the moving ring, and a sealing weir is arranged between the variable-depth spiral T-shaped grooves. The number of variable-depth spiral T-shaped grooves is an even number between 8 and 24; the radial width of the entire variable-depth spiral T-shaped groove accounts for no more than one-third of the radial width of the entire sealing end face. The invention effectively improves the fluid dynamic pressure effect, improves the working efficiency of the mechanical seal; ensures the static sealing performance of the mechanical seal; solid particles can be discharged from the sealing end face in time, reduces the friction between the end faces, and improves the temperature distribution. The problem of deformation of the sealing ring or even cracking of the end face of the mechanical seal due to uneven heating is avoided.

Description

Technical field [0001] According to the present invention, a depth T-shaped groove mechanical sealing end surface structure is provided, and in particular, a certain number of variable depth spiral T-grooves are opened on the end surface of the operation, which belongs to the rotating shaft seal technology in the fluid seal. Background technique [0002] Mechanical seal is a shaft sealing device for turbo mechanical, widely used in equipment in aerospace, petrochemical, pharmaceutical, and energy. During the actual use of the mechanical end seal, it is required to adapt to the extreme condition conditions such as high pressure, high speed and working conditions, which results in a sealing end surface that is easily contacted, causing the frictional wear of the sealing end surface and easy to fail; to achieve non-contact sealing Then, the sealing end surface gap is increased, resulting in an increase in the amount of leakage. [0003] Theoretical calculations and experimental stud...

AI Technical Summary

Problems solved by technology

[0004] Due to the above-mentioned problems in the use of microscopic cavity and pumping groove alone, in recent years, it has been proposed to use the combination of microscopic cavity and pumping groove, which not only improves the dynamic performance of the seal, but also reduces the leakage, but there are discharges in the work. The problem of insufficient crumb capacity

The wear and tear debris cannot be discharged in time, resulting in increased frictional heat generation between the sealing end faces and uneven temperature distribution, resulting in deformation of the end faces. In severe cases, cracks will occur on the sealing end faces, which greatly reduces the performance of the mechanical seal.

At the same time, the sealing performance is unstable, and it is easy to be affected by the fluctuation of liquid film pressure to generate vibration, resulting in poor lubrication effect when starting and stopping, end face wear and short service life.

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