Mechanical seal

Abstract

The invention discloses a mechanical seal which comprises a movable ring, a fixed ring, a corrugated pipe, a spring, a front movable ring base and a rear spring base. The movable ring is arranged in a counter bore formed in the end face of the front end of the corrugated pipe. The corrugated pipe is sleeved with the spring. The two ends of the spring are supported by the front movable ring base and the rear spring base respectively. The front movable ring base is fastened at the front end of the corrugated pipe. The mechanical seal is characterized in that a tooth-shaped ring is arranged on the corrugated pipe and fastened at the rear end of the corrugated pipe, a plurality of rectangular teeth are arranged on the outer circumference of the tooth-shaped ring, separation and reunion teeth are arranged on the portion, corresponding to the tooth-shaped ring, of the end face of the front movable ring base, the separation and reunion teeth and the rectangular teeth are arranged in a staggered mode, the movable ring and the counter bore are in interference fit, an axial groove is formed in the outer wall of the movable ring, a protruding strip is arranged on the inner wall of the counter bore, an inner hole is formed in the front movable ring base to fasten the counter bore through the outer wall of the counter bore, and an elastic bending part is arranged in the middle of the corrugated pipe. The mechanical seal has the advantages of being capable of preventing the corrugated pipe from being twisted off, preventing the movable ring from getting loose and automatically compensating for sealing abrasion, long in service life and suitable for forward and backward working conditions.

Description

technical field [0001] The invention relates to a mechanical seal used in pump products. Background technique [0002] At present, the mechanical seals used in pump products seen in the market mainly have the following deficiencies: 1. The bellows follower ring and pump shaft rotate at high speed during operation, and the bellows are easily twisted due to force; 2. Because of the setting of the outer spring of the bellows, the bellows can only rotate in one direction, and the reverse rotation is opposite to the direction of the torsion of the spring, which will cause the bellows to break; 3. The moving ring is fixed on the rubber bellows through interference When working, the moving ring rotates with the pump shaft at high speed, and the friction between the moving ring and the static ring will often generate a temperature above 70 degrees. At this time, the bellows will soften and deform to a certain extent. Affect the sealing performance; 4. The moving ring and the static...

AI Technical Summary

Problems solved by technology

[0002] At present, the mechanical seals used in pump products seen in the market mainly have the following deficiencies: 1. The bellows follower ring and pump shaft rotate at high speed during operation, and the bellows are easily twisted due to force; 2. Because of the setting of the outer spring of the bellows, the bellows can only rotate in one direction, and the reverse rotation is opposite to the direction of the torsion of the spring, which will cause the bellows to break; 3. The moving ring is fixed on the rubber bellows through interference When working, the moving ring rotates with the pump shaft at high speed, and the friction between the moving ring and the static ring will often generate a temperature above 70 degrees. At this time, the bellows will soften and deform to a certain extent. Affect the sealing performance; 4. The moving ring and the static ring will wear during the friction process, and the automatic compensation for wear generally requires a complex structure

In short, the mechanical seals of the prior art have the above-mentioned problems for a long time, and it is difficult to solve them completely together.

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