Negative pressure groove end face mechanical seal structure

Abstract

The invention relates to a negative pressure groove end face mechanical seal structure, comprising a mechanically sealed moving ring and a mechanically sealed static ring, one side of the end faces of the moving ring and the static ring is a high pressure side namely upstream, the other side of the end faces of the moving ring and the static ring is a low pressure side namely downstream, at leastone end face of the moving ring or the static ring is provided with negative pressure groove groups which are symmetrically distributed with the center of rotation, the upstream of each negative pressure groove group is provided with a micropore annular band, each negative pressure groove group is composed of micropore dynamic pressure grooves with spiral deformation and inclination and relief grooves, the micropore dynamic pressure grooves and the relief grooves are distributed at intervals, the relief grooves are close to the terminals of the dynamic pressure grooves, and the downstream of each negative pressure groove group is provided with an annular sealing dam with a smooth plane. The invention has the beneficial effects of enhancing antijamming capability of sealing in operation athigh speed, improving dynamic pressure opening capability of a high speed seal face under the low speed working condition, realizing non-contact stability of the seal face under the high speed working condition, reducing end face contact wear, prolonging service life and improving sealing reliability.

Description

technical field [0001] The invention belongs to the technical field of mechanical end face sealing, and in particular relates to a shaft end sealing device suitable for rotating shafts of various compressors, pumps, kettles and other rotating machines, in particular to a negative pressure groove end face mechanical seal structure. Background technique [0002] Dry gas seal is a non-contact mechanical seal. Due to its excellent performance in energy saving, environmental protection, and high reliability, it has gradually become the direction of mechanical seal development and the preferred sealing method for large-scale equipment design. With the rapid development of petrochemical and other industries, mechanical seals are required to develop to high parameters, with higher stability and reliability and longer service life. [0003] Since the 1990s, domestic and foreign sealing companies represented by John Crane have successively introduced one-way spiral grooves, one-way he...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing positive pressure groove structure, which is prone to sealing gas film disturbance, poor anti-interference ability, easy wear and short service life under high-speed working conditions, the present invention provides an High performance, low-speed opening performance, reduced end-face contact wear, high reliability, long service life negative pressure groove end face mechanical seal structure

Images