Self-sealed zero leakage hydrophobic molded surface mechanical sealing end face structure

Abstract

The invention discloses a self-sealed zero leakage hydrophobic molded surface mechanical sealing end face structure, which comprises a dynamic ring and a static ring which are mechanically sealed, wherein at least one sealed end face of the dynamic ring or the static ring is a composite molded surface consisting of a microgroove dynamic pressure ring belt, a sealed dam and a hydrophobic molded surface distributed in turn from high to low direction. The structure has the advantages that: the self-sealing property of the narrow hydrophobic molded surface can obviously reduce the leakage and even reaches zero leakage; by adopting one or more hydrophobic molded surfaces, the abrasion of the end faces can be reduced or avoided, and the integral sealing property and the abrasion resistance of mechanical seal can be greatly improved; and by adopting the combination mode of the microgroove dynamic pressure ring belt and the hydrophobic molded surface, a lubricating medium can be stored in the end faces to prevent dry grinding of the end faces when the machine is started and improve the opening property and the reliability of mechanical seal.

Description

technical field [0001] The invention belongs to the technical field of mechanical end face sealing, in particular to a shaft end sealing device suitable for rotating shafts of various compressors, pumps, kettles, etc. Hydrophobic surface mechanical seal end face structure. Background technique [0002] The shaft seal of fluid machinery often uses mechanical seals, packing seals, oil seals, labyrinth seals, etc. When the non-contact mechanical seal with grooves such as spiral grooves operates normally, the end face groove generates fluid dynamic pressure, which increases the opening force of the end face, and the increase in fluid film thickness leads to an increase in leakage rate; at the same time, the hardness in the medium increases. The grinding debris produced by high-quality abrasives and the end face during start-stop is also easy to accumulate at the root of the groove and cause wear to the end face, resulting in seal failure. When the contact mechanical seal is st...

AI Technical Summary

Problems solved by technology

When the non-contact mechanical seal with grooves such as spiral grooves operates normally, the end face groove generates fluid dynamic pressure, which increases the opening force of the end face, and the increase of fluid film thickness leads to an increase in leakage rate; at the same time, the hardness in the medium increases. The grinding debris generated by high-quality abrasives and the end face during start-stop is also easy to accumulate at the root of the groove and cause wear to the end face, resulting in seal failure

When the contact mechanical seal is started, the lack of fluid lubrication between the end faces will cause frictional heat to rise and be accompanied by wear, deformation or even thermal cracking, so the seal life is short

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