Locking mechanism for rotating round nuts in liquid environments

Abstract

The invention relates to a locking structure for rotating a round nut in a liquid environment. The thrust plate (1) has a boss end surface (10), and radial rectangular grooves (6) are evenly distributed on the boss end surface (10). , there are multiple locking teeth (7) on the locking ring (2), each locking tooth (7) is installed in the radial rectangular groove (6) on the thrust plate (1); the round nut (3 ) The outer circle is evenly distributed with axial grooves (5), and the inner ring surface (8) on the locking ring (2) is assembled with the axial groove (5) of the round nut (3) in the radial direction. The locking structure of the present invention rotates in a liquid environment, the locking structure is reliable and at the same time has the advantages of not damaging the surface of the thrust disc, reducing hydraulic friction loss, reducing the pressure pulsation of the cooling water and avoiding the flow of the rotating cooling water to the locking structure. characteristics such as vibration.

Description

technical field [0001] The present invention relates to a locking structure for rotating a round nut in a liquid environment. Background technique [0002] The third-generation shielded nuclear power main pump is the key equipment in the primary circuit of the nuclear island. Its function is to transport the high-temperature, high-pressure and high-radiation coolant in the primary circuit of the reactor, and to provide the reactor with coolant head and flow. The main pump is equipped with a shielded motor, and the rotor of the shielded motor is completely sealed in the pressure boundary of the container, which can achieve zero leakage of radiant coolant and ensure safety. Since the shielded motor is completely sealed and the rotor is not exposed, in order to measure the rotor speed, a speed sensor is installed on the end cover at the bottom of the motor. The speed sensor is inserted into the head end of the rotor shaft through the end cover hole, and a round nut is installed...

AI Technical Summary

Problems solved by technology

Anti-loosening washers such as spring washers and internal and external tooth lock washers rely on the pre-tightening force of the nut to bite the connecting surface of the supported body to play a fastening role, but damage the surface of the thrust plate workpiece and the vibration and coolant pressure generated by the high-speed movement of the motor, Temperature changes may make the round nut loose; the double-hole stop washer needs two nuts to work; the single-ear stop washer and the outer tongue stop washer have similar functions, and the ear structure needs to be bent to fasten the edge of the connected part, and the speed The outside of the sensor nut is round, there is no flat surface to match it, and there may be problems such as cracks when bending at a large angle

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