Mechanical seal for starting water feeding pump

Abstract

The invention discloses a mechanical seal for starting a water feeding pump, which comprises a mechanical seal pressing cover, a mechanical seal connecting ring, a mechanical seal shaft sleeve, a fixed ring, a sleeve ring, a movable ring, a movable ring seat and a plurality of helical springs. The mechanical seal pressing cover is sleeved on a pump shaft, the mechanical seal connecting ring is connected on the inner end face of the mechanical seal pressing cover, a mechanical seal cavity is jointly formed by a groove of the mechanical seal connecting ring and an inner cavity of the mechanical seal pressing cover, the mechanical seal shaft sleeve is fixed onto the pump shaft, the fixed ring is embedded to the inner end of the inner circumferential surface of the mechanical seal pressing cover, the sleeve ring is fixedly sleeved at the inner end of the mechanical seal shaft sleeve through stop screws, the movable ring seat is fastened on the sleeve ring in an axially movable manner, the movable ring is sleeved in the middle of the mechanical seal shaft sleeve in an axially movable manner, the outer end face of the movable ring is opposite to the inner end face of the fixed ring, the inner end of the movable ring is embedded between the movable ring seat and the sleeve ring, and the helical springs are circumferentially arranged between the movable ring seat and the sleeve ring, so that the inner end face of the fixed ring constantly and slidably fits with the outer end face of the movable ring.

Description

technical field [0001] The invention relates to a start-up feedwater pump for a nuclear power plant, in particular to a mechanical seal used for start-up feedwater pumps. Background technique [0002] The start-up feed water pump for nuclear power plants is used to supply water to the steam generator during the start-up and normal shutdown of the reactor, without using the water source of the auxiliary water supply system, and to facilitate the flushing of the secondary circuit during start-up. [0003] The existing mechanical seal used to start the feed water pump is a bulk mechanical seal. When repairing the mechanical seal, it is not only necessary to remove the bearing parts, but also to move the pump and motor, so that the replacement of the mechanical seal cannot be completed in a short time. Contents of the invention [0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a mechanical seal for starting the feed wat...

AI Technical Summary

Problems solved by technology

When repairing the mechanical seal, not only the bearing parts need to be removed, but also the pump and motor must be moved, so that the replacement of the mechanical seal cannot be completed in a short time

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