A labyrinth stop sealing device

Abstract

The invention provides a labyrinth type halt sealing device. The labyrinth type halt sealing device at least comprises a labyrinth gland and a movable ring, wherein a rotary shaft is sleeved with the movable ring; the movable ring can rotate along with the rotary shaft; the labyrinth gland is fixedly installed on an equipment end cover through a bolt; the movable ring is composed of a cylindrical extending-out part and a step part; an annular cavity is formed between the labyrinth gland and the movable ring; the cavity is internally provided with a sliding ring and a floating sealing ring; two or more sliding grooves are evenly distributed in the outer circumference of the step part of the movable ring; the sliding grooves extend from one end of the step part of the movable ring to the other end and are in a spiral shape; the sliding ring is internally provided with cylindrical pins corresponding to the sliding grooves in number; the cylindrical pins are vertically embedded into the inner circumference of the sliding ring and extend into the sliding grooves; the cylindrical pins and the sliding grooves are matched; the cylindrical pins can slide in the sliding grooves. The labyrinth type halt sealing device can achieve automatic sealing under the equipment halt state, and therefore grease is prevented from being outwards leaked from a gap between the movable ring and the labyrinth gland.

Description

technical field [0001] The invention provides a lubricating oil labyrinth sealing device for a bearing box or a gear box of a rotating shaft in mechanical equipment, in particular to a labyrinth sealing device capable of sealing immediately when the machine stops, and belongs to the technical field of sealing devices. Background technique [0002] The labyrinth seal is to set a number of annular sealing teeth arranged in sequence around the rotating shaft. A series of interception gaps and expansion cavities are formed between the teeth. device for the purpose. Because there is a gap between the rotor and the casing of the labyrinth seal, there is no solid contact, and thermal expansion is allowed, so it is suitable for high temperature, high pressure, and high speed frequency occasions. This sealing form is widely used in steam turbines, gas turbines, compressors, and blowers. The shaft end and the seal between stages. [0003] The labyrinth seals currently on the market ...

AI Technical Summary

Problems solved by technology

However, in the process of shutting down or starting up, grease leakage often occurs. This is because when the equipment is running, the oil supply must be stopped first, and oil must be supplied before starting up.

However, after shutdown and before startup, because the equipment is in a stopped state, the labyrinth seal, which relies on centrifugal force to achieve sealing, completely loses its sealing function, and grease flows out from the gap between the stator and the rotor.

In response to the above situation, there is no solution on the market at present, and generally it can only be allowed to leak, which not only produces waste, but also pollutes the environment

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