Working sealing device for water turbine spindle

Abstract

The invention discloses a working sealing device for a water turbine spindle. A sealing mechanism consists of a sealing block, a wear-resistant ring, a sealing box, a decompression drain pipe, a sealing cover and an air shroud; the sealing block below the wear-resistant ring is sleeved at the upper end of a positioning screw in the sealing box; the lower end of the positioning screw is fixed at the bottom of the sealing box; a pressure water inlet pipe is communicated with the cavity of the sealing box at the bottom of the sealing block; the wear-resistant ring is in close contact fit with the sealing block below the wear-resistant ring under the action of water inlet pressure of the pressure water inlet pipe; the sealing box is arranged above the sealing cover; the decompression drain pipe is communicated with a drain hole of a labyrinth slot in the sealing cover; the sealing cover is arranged on a top cover of a water guide mechanism; and the air shroud is arranged between the sealing cover and the top cover. The sealing mechanism is arranged outside a rotation oil pan of the spindle, wherein the wear-resistant ring is fixedly connected with the periphery of the rotation oil pan. The sealing device has the self compensating function, reduces overhauling times, prolongs the service life, has high sealing performance, and improves the running stability of a water turbine.

Description

technical field [0001] The invention relates to a sealing device of a water turbine, in particular to a working sealing device of a main shaft of the water turbine. Background technique [0002] A small amount of water leakage will occur in the anti-leakage ring of the runner of the water turbine during operation, and the water leakage will enter the machine pit along the gap between the main shaft of the water turbine and the fixed parts, making the water turbine unable to operate normally. The technical measures taken to solve this problem in the prior art are generally to install a working sealing device under the main shaft bearing of the turbine. The working sealing device needs to be replaced frequently because the sealing block and the anti-wear ring are easy to wear. When the sealing block and the anti-wear ring are worn out for maintenance and replacement, it is necessary to dismantle the floor of the turbine floor, bearings, and disassemble the water guiding mechan...

AI Technical Summary

Problems solved by technology

[0003] In addition, there is also a structure in which the working seal of the main shaft of the turbine is arranged outside the bearing. The seal block is an L-shaped seal block that is in close contact with the periphery of the rotating oil basin. The contact surface of the seal block wears quickly and has no self-compensation function.

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