An online adjustment mechanism for mechanical seal pretightening force

Abstract

The invention provides a mechanical sealing pre-tightening force online adjusting mechanism and belongs to the field of pump shaft end sealing. The mechanical sealing pre-tightening force online adjusting mechanism comprises spiral micrometer heads, limiting screws, spiral micrometer head end caps, a supporting shell, pressure stress sensors, a three-foot pushing ring and a static ring mounting sleeve; the supporting shell, the three-foot pushing ring and a test cavity shell are coaxial with a transmission shaft; three spiral micrometer heads are installed on the peripheral surface of the supporting shell at intervals of 120 degrees; two limiting screws are symmetrically installed on the peripheral surface of the supporting shell; the end part of each spiral micrometer head is provided with the corresponding spiral micrometer head end cap; the three-foot pushing ring is a pressure stress sensor base; and a static ring component is installed on the test cavity shell through the static ring mounting sleeve and is closely attached to a moving ring component. Through a simple adjusting mechanism, the mechanical sealing pre-tightening force online adjusting mechanism realizes online adjustment of mechanical sealing pre-tightening force and plays an important role in study on the mechanical sealing performance and the service life; and compared with other adjusting manners, the mechanical sealing pre-tightening force online adjusting mechanism has a simple and reliable structure and does not need an external power device.

Description

technical field [0001] The invention belongs to the field of shaft end seals for pumps, and in particular relates to an on-line adjustment mechanism for mechanical seal pretightening force. Background technique [0002] Liquid lubricated mechanical seals are widely used in various hydraulic systems. The mechanical seal mainly includes a moving ring assembly and a static ring assembly. The moving ring assembly is installed on the rotating shaft and remains relatively stationary with the rotating shaft, while the static ring assembly is installed on the housing. Since elastic devices such as springs or bellows need to provide preload and compensate for axial wear, the radial displacement of both the moving ring and the static ring is limited by the sealing ring. According to different compensation forms, mechanical seals are divided into two forms: dynamic ring compensation and static ring compensation. Both forms rely on the pre-tightening force to ensure the tight fit of t...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the current mechanical seal pretightening force adjustment mechanism is relatively complicated and the reliability is not high, the present invention proposes an online adjustment mechanism for mechanical seal pretightening force, which can realize precise adjustment of the pretightening force on the sealing end face, and is suitable for the use of Mechanical seal device with dynamic ring compensation or static ring compensation

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