Nuclear grade valve electric device

Abstract

The invention provides a nuclear grade valve electric device which can operate stably in a nuclear power plant containment vessel and has the function of moment overload protection function, and the magnitude of moment overload protection is adjustable. The nuclear grade valve electric device comprises an actuating mechanism linked to a motor output shaft and a control mechanism driven by the actuating mechanism, wherein the actuating mechanism comprises a moment control assembly and a travel control assembly; the control mechanism comprises a microswitch assembly. The moment control assembly comprises a fixed bracket, a resetting part and a displacement converting part. The fixed bracket is fixedly arranged in a case; one end of the displacement converting part is linked to the motor output shaft, and the other end is linked to the microswitch assembly. The fixed bracket is provided with an installation hole, and the displacement converting part rotates circumferentially in the installation hole. The resetting part is located between the displacement converting part and the fixed bracket and realizes resetting of the displacement converting part after the displacement converting part rotates circumferentially along the installation hole. When a motor moves exceeding a safe range during operation, the moment control assembly can trigger the microswitch assembly and stop the motor.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a nuclear-level valve electric device. Background technique [0002] In today's increasingly depleted resources, nuclear energy has become the first choice of new energy for more and more countries, and its proportion in my country's electric energy structure is also becoming more and more prominent. In November 2007, the State Council approved the "National Nuclear Power Development Special Plan (2005-2020)". According to the plan, by 2020, my country's nuclear power operating installed capacity will reach 40 million kilowatts, and 18 million kilowatts are under construction. According to a rough estimate of the scale of nuclear power construction newly started and put into operation within 15 years, the total demand for nuclear power project construction funds is about 450 billion yuan. The use of nuclear-grade valve actuators in currently operating nuclear power plants in Chin...

AI Technical Summary

Problems solved by technology

The control mechanism in the traditional valve electric device is a control circuit composed of electronic components, chips, control programs, etc. The circuit contains electronic sensitive components, which are affected and interfered by environmental factors such as high temperature, high pressure and nuclear power radiation inside the nuclear power plant. Extremely serious, so the complex environmental factors in the nuclear power plant containment will inevitably lead to the failure of the electronic equipment inside the electric valve electric device to work normally, which will cause the instability of the valve electric device itself, and make the traditional valve unable to be used normally in the containment of the nuclear power plant. And because the interior of the nuclear power plant is closed, the staff cannot easily enter the interior for maintenance, which affects the working efficiency of the nuclear power plant.

In addition, due to the influence of the special environmental factors of nuclear power plants, the current valve electric devices lack the torque overload protection and travel limit functions that can reliably operate in the containment of nuclear power plants, so it cannot be guaranteed safe and reliable operation in the containment of nuclear power plants

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