High-precision high-temperature-resistant nuclear-radiation-resistant valve position acquisition device

Abstract

The invention relates to a high-precision high-temperature-resistant nuclear-radiation-resistant valve position acquisition device. The device can be used for acquiring valve rod position informationof a working valve in a high-temperature and nuclear-radiation environment and realizing all-position detection and control in a valve opening and closing process. The device mainly comprises a sealing shell, a protective shell, a position transmission device, a rotary transformer and a magnetic transmission element. The device is installed on a valve executing mechanism and directly connected with a valve rod to collect the position information, and all-position real-time detection of the valve is achieved. Through non-contact motion transmission of the magnetic transmission element, mutual isolation of a main body part of the device and a pressure medium of the valve is achieved, and the leakage risk is reduced. A coil of the rotary transformer adopts an insulating layer made from a polyimide material, so that high-temperature-resistant performance and nuclear-radiation-resistant performance are improved. According to the device, real-time acquisition of the position of the valve ina whole stroke can be achieved, the detection precision is high, and the device has the advantages of being resistant to a high pressure, free of influence of media in the valve, resistant to a high temperature and nuclear radiation, compact in structure, simple, reliable and the like.

Description

technical field [0001] The invention relates to a high-precision valve position acquisition device, in particular to a high-precision valve position acquisition device for valve actuators used in high-temperature nuclear radiation. Background technique [0002] The valve position acquisition device is an indispensable displacement sensing device for valve actuators. At present, the vast majority of valve position acquisition devices are installed inside the valve actuator, and indirectly obtain the valve position information by directly measuring the movement of the transmission parts of the valve actuator. There is a large gap in the mechanical connection between the valve actuator and the valve, coupled with the manufacturing error of the valve actuator's own transmission parts, resulting in a large measurement error in the valve position information obtained by the valve position acquisition device, and the repeatability is low. Affects precise control of valve position....

AI Technical Summary

Problems solved by technology

This method has low precision of valve position control, and the installation and adjustment are cumbersome.

Since it is impossible to collect information from any position of the valve within the full stroke working range, it is impossible to realize real-time monitoring of the valve position in the process of opening and closing the valve, and it is impossible to realize intelligent control requirements such as fault diagnosis and troubleshooting, which seriously restricts the intelligence of the valve. Function upgrade and development

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