Moving shaft sealing device and sealing method

Abstract

The invention discloses a moving shaft sealing device which is installed outside a moving shaft and used for sealing between the moving shaft and a base. The moving shaft sealing device comprises a first sealing mechanism and a second sealing mechanism, wherein the moving shaft forms a sealing medium side and a non-sealing medium side on both sides of the sealing device; the first sealing mechanism is wrapped on the sealing medium side outside the moving shaft, the second sealing mechanism is wrapped on the non-sealing medium side outside the moving shaft, and the second sealing mechanism is detachable; and the first sealing mechanism includes two states, the first state is a daily state, the first sealing mechanism is not sealed with the moving shaft, the second sealing mechanism tightlywraps the moving shaft for sealing, the second state is an alternative state, the first sealing mechanism is in sealing contact with the moving shaft to block the flowing out of fluids on the sealingmedium side, and the second sealing mechanism can be taken out and replaced. The invention further discloses a sealing method. The sealing performance of the non-sealing medium side can be guaranteedin a normal use state and a maintenance state of the second sealing mechanism, the maintenance of the sealing mechanisms is facilitated, and the service life is prolonged.

Description

technical field [0001] The invention relates to a sealing device and a sealing method, in particular to a moving shaft sealing device and a sealing method. Background technique [0002] In the prior art, whether it is the drive shaft of the gate, the drive shaft of the ship, or the output shaft of the drive pump valve switch, it needs to work in the medium (such as liquid or gas) for a long time. This kind of drive shaft is generally called the motion shaft. , the movement mode of the motion shaft includes rotary motion and reciprocating motion, which can be called the rotary motion shaft and the reciprocating motion shaft respectively. Therefore, the motion shaft has a near water end (or called "sealed medium side") and a far water end (or called "unsealed medium side"). The non-sealed medium side is a working environment without fluid, and the sealed medium side is exposed. In a fluid, for example, the near water end is exposed to water. Leak-proof isolation is required ...

AI Technical Summary

Problems solved by technology

In order to prevent the water in the river channel from leaking into the hoist chamber, the bottom shaft and the wall need to be sealed with a sealing device. The requirement for the sealing packing is to ensure that the rotation of the bottom shaft is not affected by the sealing packing and to achieve At the same time, the price and cost are also considered. Therefore, the sealing packing in the sealing device is often made of soft materials, such as rubber sealing packing, etc., but the service life of this type of material is limited. As the service time of the steel dam increases, the sealing packing seal The performance drops, the sealing device starts to leak water, and the water enters the hoist chamber through the wall at both ends of the shaft, affecting the normal operation of the driving mechanism and even causing accidents

[0004] The structure of the existing sealing device is complicated, and the technical problem of how to replace the aging sealing material in the underwater state is not solved. Once the steel dam gate is put into use, the bottom shaft is located at the bottom of the river for a long time. The underwater environment is inconvenient to operate, and it is impractical to drain the water. When replacing the sealing material, because the water pressure in the river is higher than that in the hoist chamber, once the sealing device is removed, a large amount of water will flow into the hoist chamber, which will increase the replacement difficulty

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