Nuclear power plant drum screen support structure

Abstract

The invention discloses a support structure for a drum-shaped filter screen in a nuclear power plant, which comprises a main shaft, a main shaft bearing seat, a backing plate for the bearing seat, a drum net protection device, a wheel hub and spokes, the main shaft is installed in the main shaft bearing seat, and the wheel hub is installed on the main shaft , the spokes are connected to the hub; the drum net protection device includes a protective pressing block and a protective tie rod; the bearing base plate is fixed on the concrete floor, the main shaft bearing seat is connected under the protective pressing block, and the protective pressing block is connected to the bearing seat through the protective pulling rod Backing plate; the breaking load of the protective tie rod enables it to be broken before the drum net is damaged, ensuring the safety of the drum net. In the present invention, a drum net protection device is arranged on the main shaft bearing seat, and when the drum net is subjected to a relatively large buoyancy force, the protection rod is pulled off to protect the drum net. The hub adopts forging structure, and the spokes adopt H-shaped steel structure.

Description

technical field [0001] The invention belongs to the field of circulating water filtration in nuclear power plants, and more particularly, the invention relates to a support structure for a drum-shaped filter screen used for filtering seawater in a circulating water filtration system in a nuclear power plant. Background technique [0002] Drum-shaped filter screen (also known as drum screen) is the last large-scale filter equipment in the "defense-in-depth" system of nuclear power plant cold source to resist marine organisms. Its performance directly affects the safety of nuclear power plant cold source and the safe and stable operation of units. [0003] When the "outside in and inside out" type drum net is running, water enters from outside the net and water comes out from the net, so that garbage such as sea creatures are intercepted outside the drum net. Since the water level outside the drum net is higher than the water level inside the drum net, the drum net is subject ...

AI Technical Summary

Problems solved by technology

At present, the wheel hubs designed and manufactured in China are cast structures. In order to improve the strength of the hubs, a large number of reinforcing ribs are cast on the hubs. The structure is complex, and the precision of the cast hubs is not high. Casting cracks will inevitably occur, which will affect the performance and service life of the hubs.

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