Self-adjusting waterless seal

Abstract

An automatic adjusting non-water sealing device is formed by a secondary impeller, a dynamic sealing ring, a static sealing ring, an M-shaped rubber corrugated pipe, an O-shaped sealing ring, a pump shaft, a sealing gland and a sealing cavity shell. The dynamic sealing ring is fixedly arranged on the pump shaft through the O-shaped sealing ring. The secondary impeller is arranged on the pump shaft and located at the left end of the dynamic sealing ring. The M-shaped rubber corrugated pipe is arranged between the static sealing ring and the sealing gland, and two ends of the M-shaped rubber corrugated pipe are fixed through the static sealing ring and the sealing gland. The dynamic sealing ring is arranged between the secondary impeller and the static sealing ring. The natural sealing effect can be achieved due to the fact that the pipe diameter of the M-shaped rubber corrugated pipe 1 generates different negative pressures when the secondary impeller rotates, and the negative pressures force deformation amount to be different. A mutual friction phenomenon does not occur between the dynamic sealing ring and the static sealing ring, and the service life of the sealing device is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of sealing, and in particular relates to an automatic adjustment waterless sealing device. Background technique [0002] At present, the sealing devices of ordinary centrifugal slurry pumps, clean water pumps or slurry pumps use mechanical seals. The mechanical seal uses springs for elastic seal compensation. The spring force remains unchanged. High-speed rotating springs will generate heat and need to add cooling water. On the other hand, the main parts of the mechanical seal must be in contact with the liquid medium. Over time, the liquid medium will corrode the mechanical seal parts, and when the pump body stops running, the medium in the pipeline connected to the pump body will flow back, and the liquid medium that flows back will The radial impact on the sealing contact surface will cause the sealing contact surface to be washed away, which will seriously cause the seal not to be tight and often cause l...

AI Technical Summary

Problems solved by technology

[0002] At present, the sealing devices of ordinary centrifugal slurry pumps, clean water pumps or slurry pumps use mechanical seals. The mechanical seal uses springs for elastic seal compensation. The spring force remains unchanged. High-speed rotating springs will generate heat and need to add cooling water. On the other hand, the main parts of the mechanical seal must be in contact with the liquid medium. Over time, the liquid medium will corrode the mechanical seal parts, and when the pump body stops running, the medium in the pipeline connected to the pump body will flow back, and the liquid medium that flows back will Radial impact on the sealing contact surface, causing the sealing contact surface to be washed away, seriously resulting in poor sealing and frequent leakage

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