Sealed cavity-based rotating shaft threaded water sealing structure

Abstract

The invention discloses a sealed cavity-based rotating shaft threaded water sealing structure. Main parts involved in a sealing action comprise a rotating shaft, a four-head rectangular left-hand thread-double-head rectangular right-hand thread combination structure and a cavity; a stainless steel sealing washer is designed between a rotating shaft part and the cavity of a water sealing structurewith threads; and the effective sealing area is the part where the rotating shaft moves relative to the cavity. When a sealing system operates, water is introduced from a water inlet of a left end cover and flows into a middle groove of reverse threads on the shaft through a water inlet channel of the stainless steel sealing washer; simultaneously, a double-head rectangular right-hand thread structure and a four-head rectangular left-hand thread structure on the other side press water to the middle groove together when rotating, namely, the space between the rotating shaft and the stainless steel sealing washer is full of water, and the water is drained from symmetrical drainage channels; and therefore, dynamic seal is realized. The sealed cavity-based rotating shaft threaded water sealingstructure can ensure safe and stable operation of the sealed cavity, meanwhile, can effectively simulate actual steam turbine operating conditions, and improves the water erosion measurement efficiency.

Description

technical field [0001] The invention belongs to the technical field of industrial equipment, and in particular relates to a rotating shaft thread water sealing structure based on a sealing cavity, which is applied to the water erosion resistance measurement of steam turbine blade materials. This general sealing structure can also be applied to some test devices or machining equipment in the fields of tribology, surface coating, machining, etc., similar to cavity sealing involving rotating parts. Background technique [0002] Water erosion of blades in steam turbines is a common phenomenon. With the increase of the single unit power of the steam turbine, the use of longer final stage blades is an inevitable means to improve the efficiency of the steam turbine. For the final stage blades of modern high-power steam turbines, the peripheral speed at the end of the impeller can be as high as 650m / s. As a result, the working conditions of the blades are also becoming more severe....

AI Technical Summary

Problems solved by technology

Water erosion of the blades is a serious hazard, ranging from destroying the profile of the blades and reducing the efficiency of the cascade, to breaking the blades and endangering the operation of the unit

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