Bellows mechanical sealing device with self-circulation function

Abstract

The invention discloses a bellows mechanical sealing device with a self-circulation function, which comprises a shaft sleeve, a sealing gland, an elastic compensation component, a moving ring, an auxiliary sealing part and a pump ring. The elastic compensation component comprises a bellows, a static ring and an end cover; the static ring and the end cover are connected to both ends of the bellows in a sealing manner; the end cover is fixed on the sealing gland; the outer wall of the shaft sleeve is provided with a step; one side of the moving ring is abutted against the step; the pump ring is propped against the moving ring by a wave spring; a clamp spring is arranged on the shaft sleeve in a position outside the pump ring; the pump ring and the moving ring are clamped on the shaft sleeve by the clamp spring and the step; anti-rotating parts are respectively between the shaft sleeve and the moving ring and between the shaft sleeve and the pump ring; a ring-shaped clamping groove is formed in the shaft sleeve in a position outside the end cover; and a limiting plate is clamped in the clamping groove and is fixed on the sealing gland. The elastic compensation component is fixed with the sealing gland, the moving ring and the pump ring are clamped on the shaft sleeve by the step and the clamp spring and the sealing gland and the elastic compensation component are limited on the shaft sleeve by the limiting plate, so as to form a cartridge mechanical seal.

Description

technical field [0001] The invention relates to a mechanical seal device of a pump, in particular to a bellows mechanical seal device with self-circulation. Background technique [0002] Single-stage cantilever centrifugal pumps are the most widely used in fluid pumping. In order to reduce the overall size of the pump body, improve the bending strength of the pump shaft, and improve the movement accuracy of the pump shaft, the axial space of the pump body seal cavity is objectively short, so the reasonable design and selection of mechanical seals It causes difficulties, especially it is difficult to design as a cartridge mechanical seal, the thermal load of seal flushing is large, and the thermal conductivity of the sealing end face is poor, which leads to the instability of the liquid film, resulting in dry friction of the sealing surface and the tendency of premature failure. In order to reduce the thermal load in the sealed space, stabilize the liquid film and protect th...

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Problems solved by technology

In order to reduce the overall size of the pump body, improve the bending strength of the pump shaft, and improve the movement accuracy of the pump shaft, the axial space of the pump body seal cavity is objectively short, so the reasonable design and selection of mechanical seals It causes difficulties, especially it is difficult to design as a cartridge mechanical seal, the thermal load of seal flushing is large, and the thermal conductivity of the sealing end face is poor, which leads to the instability of the liquid film, resulting in dry friction of the sealing surface and the tendency of premature failure

In order to reduce the thermal load in the sealed space, stabilize the liquid film and protect the friction pair, in some cases it is necessary to set up a pump effect ring for forced heat dissipation. The traditional pump effect ring has a rectangular thread on the outer wall to drive the circulation of the flushing fluid. In practical experience , when the speed of the pump efficiency ring of this structure is less than 1500rpm, the circulation effect is poor

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