A low-leakage spiral groove liquid film mechanical seal end face structure

Abstract

A low-leakage spiral groove liquid film mechanical seal end face structure comprises a dynamic ring and a static ring of a mechanical seal; one side of the end face of the dynamic ring or the static ring is a high-pressure side, namely, the upstream side; the other side of the end face of the dynamic ring or the static ring is a low-pressure side, namely, the downstream side; the end face of the dynamic ring or the static ring is provided with a series of launders, the downstream side is provided with a series of reverse spiral grooves uniformly distributed in the circumferential direction, the middle is provided with an annular groove communicating with the reverse spiral grooves, the upstream side is provided with outlets communicating with the annular groove and a medium side, and a series of forward spiral grooves are formed between the two adjacent outlets; and sealing dams are arranged between the reverse spiral grooves and the downstream side, and sealing weirs are arranged between the annular groove and the forward spiral grooves. The low-leakage spiral groove liquid film mechanical seal end face structure is each to achieve low leakage under various complex working conditions, excellent in tribological property, good in bearing performance and stability and long in service life.

Description

technical field [0001] The invention relates to a low-leakage spiral groove liquid film mechanical seal end face structure, which is suitable for shaft end seals under low-pressure working conditions, such as water seals for automobile engine cooling water pumps, shaft end seals in gear speed-up boxes of wind power and tidal generator sets, It can also be applied to shaft end seals of centrifugal pumps and other equipment under low pressure conditions. Background technique [0002] In actual production, there are a large number of mechanical seals operating under low pressure conditions, such as water seals for automobile engine cooling water pumps. This type of seal often has the following problems: the end face of the mechanical seal is often difficult to achieve non-contact, resulting in severe friction and wear on the seal end face and is prone to failure. If the end face is non-contact, large leakage will occur due to the existence of the seal gap. For this reason, sur...

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Problems solved by technology

[0005] In order to overcome the shortcomings of the existing mechanical seal technology, such as poor sealing performance, poor liquid film bearing performance, difficulty in realizing non-contact stable operation under low pressure conditions, and poor start-stop performance, the present invention provides a It is easy to realize low leakage, excellent tribological performance, good bearing performance and stability, long service life, low leakage spiral groove liquid film mechanical seal end face structure

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