Disengagement type nuclear power plant main pump flywheel

Abstract

The invention discloses a coming-off type nuclear power station main pump flywheel which comprises a circular disk, a rotating shaft, an upper friction pair and a lower friction pair. Stair holes are formed in the center of the circular disk and comprise an upper hole located in the top end of the circular disk, a lower end hole located in the bottom end of the circular disk and an installing hole located between the upper end hole and the lower end hole. The diameter of the upper end hole, the average diameter of the installing hole, and the diameter of the lower end hole gradually increases. The rotating shaft comprises a shaft head, an upper shaft ring and a lower shaft ring, wherein the shaft head is in interference fit with the installing hole of the circular disk, and the upper shaft ring and the lower shaft ring are respectively in clearance fit with the upper end hole and the lower end hole of the circular disk. The upper friction pair and the lower friction pair are respectively arranged on shaft shoulders at two ends of the shaft head, and bear the circular disk when the installing hole is not in interference fit with the the shaft head. In the coming-off type nuclear power station main pump flywheel, the rotating shaft and the circular disk are both designed in an integrated mode, and the circular disk is in direct interference fit with the rotating shaft, so that the coming-off type nuclear power station main pump flywheel is simple in structure and favorable to the modularized design.

Description

technical field [0001] The invention belongs to the technical field of nuclear power. More specifically, the invention relates to a detachable main pump flywheel of a nuclear power plant that can be applied to a million-kilowatt pressurized water reactor nuclear power plant. Background technique [0002] Reactor coolant pump (referred to as "main pump") is one of the key equipment of the primary circuit system of PWR nuclear power plant. The reliable operation of the main pump can ensure the continuous and safe operation of the nuclear power plant. When a power outage occurs in a nuclear power plant, the main pump loses power and idles, and the coolant flow through the core suddenly decreases, posing a threat to the safety of the reactor. In order to ensure the safety of the core under the condition of power failure of the whole plant, the main pump is required to have a long idle time. The flywheel is an effective means of energy storage. By installing a flywheel on the ma...

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Problems solved by technology

[0006] However, the above-mentioned oil-lubricated and disengaged flywheel has many components, and the connection relationship with the motor shaft is complicated. The accuracy of the flywheel is high, the lubricating oil needs to be replaced regularly, the maintenance cost is high, and there is a risk of lubricating oil leakage. Affect the safety of the main pump unit

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