Sealing components and sealing systems of nuclear power plant generators

Abstract

The invention applies to the technical field of the nuclear power station, and discloses a sealing component of an electric generator at the nuclear power station and a sealing system with the sealing component. The sealing component is used for preventing lubricating oil from sliding along the axial direction of a rotation axis of the electric generator. The sealing component comprises a circular body. The circular body is formed by splicing multiple sub-arc-rings. The inner wall of the sub-arc-ring is alternately provided with at least three oil gears for preventing the lubricating oil from sliding, an oil buffering groove clamped and installed between two adjacent oil gears and used for buffering some lubricating oil and an oil guiding groove for guiding and discharging the lubricating oil in each oil buffering groove. The oil guiding groove is installed on the end face of the sub-arc-ring along the arc length direction of the sub-arc-ring. More than two oil gears and more than one oil buffering groove can be installed on the single sealing component, so that the number of the oil gears and oil buffering grooves on the single sealing component is increased effectively, and the sealing oil-proof effect of the sealing component is improved so as to reduce the amount of the lubricating oil into the electric generator effectively.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plants, and in particular relates to a sealing component of a generator of a nuclear power plant and a sealing system with the sealing component. Background technique [0002] The sealing system of a nuclear power plant generator generally includes a sealing shoe structure for the flow of lubricating oil to isolate the outside air from the hydrogen in the body, and an outer oil retaining structure for preventing the lubricating oil on the end cover from flowing out of the generator and an inner oil retaining structure for preventing lubricating oil on the end cover from entering the generator, the inner oil retaining structure and the outer oil retaining structure are respectively arranged on both sides of the sealing shoe structure. [0003] The seal shoe structure is mainly used for lubricating oil to flow on it, so that on the one hand, it can prevent the hydrogen inside the generator fro...

AI Technical Summary

Problems solved by technology

[0006] One is to increase the number of sealing rings to achieve the purpose of increasing the number of oil teeth used to block the sliding of lubricating oil. However, due to the limited axial width of the inner oil retaining ring along the rotating shaft, an inner oil retaining ring At most two sealing rings can be installed on the top, so that the number of oil teeth is only four, the number of slow oil grooves is only two, the number of times of oil blocking and buffer discharge of oil can not meet the requirements of the application, therefore, other The oil blocking effect cannot meet the specified requirements;

[0007] The second is to improve the oil retaining effect by increasing the number of oil teeth used to block the lubricating oil from sliding on a single seal ring. When the oil-repelling groove of the oil groove is used, the oil teeth in the middle will be processed, so the number of oil teeth on the final processed single seal ring is only two, so the purpose of increasing the number of oil teeth and the number of slow oil grooves cannot be achieved;

[0008] The third is to set the inner oil retaining shaft section on the rotating shaft for the installation of the inner oil retaining structure and the sealing pad shaft section for the sealing pad structure installation as stepped shafts. For example, the diameter of the sealing pad shaft section is designed as Φ570mm, and the inner oil retaining The diameter of the shaft section is designed to be Φ650mm, and the shaft section of the seal pad passes through the R angle from Φ570mm to Φ650 of the inner oil retaining shaft section. In this way, the lubricating oil on the hydrogen side discharged from the seal pad first encounters the R fillet and is thrown out, and then The sealing ring of the inner oil retaining structure prevents the lubricating oil from sliding, but its oil retaining effect cannot meet the specified requirements

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