Nuclear-grade limit switch for monitoring opening and closing states of nuclear-grade valve

Abstract

The invention discloses a nuclear-grade limit switch for monitoring opening and closing states of a nuclear-grade valve. The nuclear-grade limit switch comprises a socket, a shell, a switch magnet, acentral rod, a guide sleeve, a bouncing diaphragm, a spring piece and a microswitch, wherein the switch magnet, the central rod, the guide sleeve, the bouncing diaphragm, the spring piece and the microswitch are sequentially arranged in the shell from left to right. The guide sleeve is coaxially assembled in the shell; the central rod is sleeved in the guide sleeve in a sliding manner; the right end of the central rod is sleeved with the bouncing diaphragm, the switch magnet is connected with the bouncing diaphragm through the central rod, the spring piece is arranged on the right side of thecentral rod, the microswitch is correspondingly arranged in the shell, the spring piece transmits the position change of the central rod to the microswitch, and the microswitch is connected with a socket. According to the invention, the connection and disconnection speed of the limit switch is improved through the permanent magnet and the bounce diaphragm, and the repeated connection and disconnection of the limit switch in a vibration environment is avoided, so that a problem of ablation of a contact point of the microswitch is alleviated or solved.

Description

technical field [0001] The invention belongs to the technical field of nuclear-level limit switches, and in particular relates to a nuclear-level limit switch for monitoring the opening and closing states of nuclear-level valves. Background technique [0002] At present, the widely used limit switches in the industry are mainly divided into contact type and non-contact type according to the contact mode. The backward contact type limit switch has many moving parts and moving parts that need to be maintained because of its direct contact working mode. Component wear causes misalignment, poor repeatability, additional torque on the actuator and short operating life. Therefore, more advanced non-contact limit switches are gradually replacing contact limit switches. [0003] The non-contact limit switches widely used in industry mainly include dry reed switch, inductive and photoelectric type, etc. However, the reliability of the dry reed switch is poor, and the electronic comp...

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Problems solved by technology

[0003] The non-contact limit switches widely used in industry mainly include dry reed switch, inductive and photoelectric type, etc. However, the reliability of the dry reed switch is poor, and the electronic components in the inductive and photoelectric limit switches are not resistant Radiation environment, so the above three non-contact limit switches are not suitable for nuclear power environment

With the continuous development of nuclear power technology, this type of limit switch is widely used on various nuclear-grade valves. The harsh environmental conditions of the nuclear-grade limit switch have many problems and cannot meet the requirements of nuclear-grade valves.

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