Single-end surface mechanical seal

Abstract

The invention discloses a single-end surface mechanical seal. The single-end surface mechanical seal comprises a rubber static ring base, a static ring, a movable ring, a rubber corrugated pipe, a transmission sleeve, a tightening ring and a spring; the static ring is mounted in the rubber static ring base; the transmission sleeve is provided with a positioning structure; the front end of the rubber corrugated pipe is pressed in the transmission sleeve through the movable ring; the tightening ring sleeves the outer peripheral wall at the back end of the rubber corrugated pipe in an interference manner; a sleeve hole is formed in the back end of the rubber corrugated pipe; an extension compensation section, inwards bent, is arranged at the middle part of the rubber corrugated pipe; multipleinner convex pieces and multiple outer convex pieces are arranged at the back end of the transmission sleeve; positioning grooves are formed in the front end periphery of the tightening ring, and arematched with the inner convex pieces one to one; and the spring applies elastic acting force to the transmission sleeve to enable the movable ring to tightly contact with the static ring. The mechanical seal is reasonable in structure; one end of the spring is reliably connected with the transmission sleeve, and the other end is reliably connected with a pump shaft, so that the rubber corrugatedpipe can be prevented from twisting off; the movable ring is totally rotated along with the pump shaft; and the wear of the movable and static rings is automatically compensated to guarantee the sealing effectiveness.

Description

technical field [0001] The invention relates to a mechanical seal, in particular to a single-end mechanical seal. Background technique [0002] The patent document CN20362729U discloses a mechanical seal structure for pumps, which includes a rubber bellows sleeved on the rotating shaft, an annular groove is arranged at one end of the rubber bellows close to the pump cover, and a moving ring is embedded in the annular groove. Steps are formed on the outside of the rubber bellows close to both ends, and the steps are respectively provided with a front spring seat and a rear spring seat, and the outside of the rubber bellows is located between the front spring seat and the rear spring seat. The position is sleeved with a spring for applying elastic force to the front spring seat and the rear spring seat; a stationary ring is arranged inside the pump cover, and a radial seal is provided between the stationary ring and the pump cover. The moving ring includes an annular main bod...

AI Technical Summary

Problems solved by technology

[0003] In this regard, the technical problem to be solved by the present invention is the problem that the rubber bellows in the existing mechanical seals are easily twisted off, resulting in seal failure.

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