Dynamic-static pressure combined type asymmetrical waviness end face fluid mechanical sealing structure

Abstract

The invention provides a dynamic-static pressure combined type asymmetrical waviness end face fluid mechanical sealing structure. At least one sealing end face on a moving ring and a stationary seal ring is provided with more than two three-dimensional asymmetrical waviness appearances, the asymmetrical waviness is in a periodical arrangement on the at least one sealing end face, the asymmetrical waviness sealing end face comprises a dam area, a conical surface and a wave crest and a wave trough of the asymmetrical waviness, the dam area is a groove-less parallel annular sealing dam arranged at the low-pressure side, the wave crest and the wave trough are connected through the conical surface, the conical surface is a linear convergence cone formed from the high-pressure side to a low-pressure side and is connected with the dam area, the conical surface can realize sealed non-contact static pressure effect; the conical degree combines with the asymmetrical waviness so that the sealing reliability can be improved, an asymmetrical waviness smooth transition curve can prevent the particles in the sealing fluid from being cumulated, and the dam area can realize static sealing when the axle is stationary. The structure provided by the invention has strong pressure resistance and antijamming capability, the leakage rate is lower at the conditions of high parameters, the fluid has good dynamic pressure effect in the process of start and stop and the fluid bearing capacity is sufficient in the normal operation.

Description

technical field [0001] The invention relates to a fluid end face mechanical seal structure of a rotary fluid machine, in particular to a dynamic and static pressure combined asymmetric wave end face fluid mechanical seal structure. Background technique [0002] Mechanical seals are the main means to prevent shaft end leakage of rotary fluid machinery. With the rapid development of petrochemical, nuclear power and other industries, the requirements for mechanical seals are developing to high parameters, with higher stability and reliability and longer service life. life. The traditional contact mechanical seal cannot form a stable liquid film between the end faces, so its service life is short, especially in high-speed, high-pressure occasions, or frequent start-stop, changing working conditions, etc., the reliability of the seal is required higher. The wear of the end face, the hot crack of the sealing ring, etc. will easily lead to the failure of the seal. The opening of...

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Problems solved by technology

Although this sealing structure can be applied to a variety of working conditions, the leakage is small, and the problem of particle accumulation in the medium is better solved, but in the process of stable operation of the seal, the existence of symmetrical waviness will weaken the static pressure capacity of the fluid , thereby reducing the bearing capacity and stability of the sealing system and increasing the risk of failure

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