Stepwise magnetic force hoisting type reactor control rod driving mechanism

Abstract

The invention provides a marching type and magnetic jacking reactor control rod drive mechanics, which comprises a rod position detector component, a coil component, a pressure shell component, a knuckle component, a driving rod component, a heatproof lagging component and the like. The whole mechanism is vertically mounted on a top cover of a reactor pressure vessel directly, wherein the pressure shell component consists of a hoisting connector, a travel sleeve and a hermetic case. The travel sleeve of the pressure shell component is an integral blind tube with a blocked upper end and the hermetic case is an integral structure composed of a tube socket of the driving mechanism on the top cover of the reactor pressure vessel, and the hermetic case. The knuckle component is composed of two identical knuckle teeth arranged side by side, the distance between the two knuckle teeth is equal to the teeth space of the driving rod component, and the two sides of the flute between the two knuckle teeth are of transitional circular arc shape. The invention greatly reduces the leakage possibility of the pressure shell of the reactor control rod drive mechanics, and greatly improves the wear resistance, the reliability and the service life of the reactor control rod drive mechanics.

Description

technical field [0001] The invention belongs to a reactor control rod driving mechanism of a pressurized water reactor nuclear power plant, in particular to a step-by-step magnetic lifting type reactor control rod driving mechanism. Background technique [0002] The reactor control rod drive mechanism is the servo mechanism of the reactor control and protection system. It is the actuator of the reactor control system and protection system. or power off and drop rods to complete the function of adjusting reactor reactivity or accidental safety shutdown; the control rod drive mechanism completes the start-up, power adjustment, maintenance power, The safety and reliability of safety shutdown under shutdown and accident state directly affect the safety and operation of the reactor. [0003] At present, there are three main types of control rod drive mechanisms used in nuclear power reactors and pressurized water reactor nuclear power plant reactors: [0004] ·Reluctance motor-...

AI Technical Summary

Problems solved by technology

However, the existing magnetic lifting type drive mechanism has the following defects: 1. Since there are three small Ω sealing welds on the pressure-resistant shell assembly, the weld positions are respectively between the seal shell and the drive mechanism socket on the top cover of the pressure vessel (lower position), between seal housing and travel sleeve (middle position) and between travel sleeve and end plug (upper position)

2. Since the control rod drive mechanism usually adopts single-toothed claw or four-toothed claw, the single-toothed claw type drive mechanism has the disadvantages of non-wear resistance, short life, low reliability and poor impact resistance; the four-toothed claw type Although the drive mechanism overcomes the defects of non-wear resistance, short life and poor impact resistance of the single-tooth claw drive mechanism, its claw mechanism still uses a crank slider mechanism, but its crank (not the claw) is made of Composed of a set of parallel four-bar mechanism (the connecting rod is the hook), it has the disadvantages of complex structure, large volume, low reliability and difficulty in guaranteeing the parallelism of the parallel four-bar mechanism

Images