CN-121993700-A - Pipeline thermal stratification displacement sensor mounting structure

CN121993700ACN 121993700 ACN121993700 ACN 121993700ACN-121993700-A

Abstract

The invention provides a pipeline thermal stratification displacement sensor mounting structure, which relates to the technical field of sensor mounting and comprises a bracket, wherein the bracket is arranged along the radial direction of a fluctuation pipe, displacement sensors are respectively arranged between the two radial directions of the fluctuation pipe and the bracket, an included angle formed by the two displacement sensors and the center of the fluctuation pipe is 90 degrees, each displacement sensor is arranged on the bracket, the displacement sensor is connected with a pull rope, and each pull rope is respectively connected with the fluctuation pipe and the corresponding displacement sensor along the radial direction of the fluctuation pipe. According to the invention, the displacement sensors are arranged in the two vertical radial directions of the fluctuation tube, and the symmetrical L-shaped brackets are matched, so that the fluctuation tube displacement change can be monitored in an omnibearing and high-precision manner, the radiation interference is effectively prevented through the arrangement of the lead shielding cover, the normal work of the displacement sensors is ensured, the heat preservation layer is matched with the mounting structure, the requirement of a mounting gap is met, and meanwhile, a mounting channel is provided for the stay cord.

Inventors

WANG MINGMING
WANG HAO
WANG YING
DI JIAJUN
LUO SHAOJIE
HE XUNSHE
Xia Ximeng
XU BEI
CHEN YAWEI
LI JIAYANG

Assignees

陕西卫峰核电子有限公司

Dates

Publication Date: 20260508
Application Date: 20251230

Claims (10)

1. A pipe thermal stratification displacement sensor mounting structure, the displacement sensor being disposed along a radial direction of a surge pipe, comprising: The support is arranged along the radial direction of the fluctuation pipe, the displacement sensors are respectively arranged between the two radial directions of the fluctuation pipe and the support, an included angle formed by the two displacement sensors and the center of the fluctuation pipe is 90 degrees, each displacement sensor is arranged on the support, the displacement sensor is connected with a pull rope, and each pull rope is respectively connected with the fluctuation pipe and the corresponding displacement sensor along the radial direction of the fluctuation pipe; the support is an L-shaped support, and the distances from the two sides of the L-shaped support to the center of the fluctuation pipe are the same; The outside of the fluctuation pipe is provided with an insulating layer, the insulating layer and the fluctuation pipe are in clearance arrangement, and the insulating layer is provided with through holes along the radial direction corresponding to each displacement sensor.
2. The pipe thermal stratification displacement sensor mounting structure of claim 1, wherein: the novel electromagnetic wave generator further comprises a lead shielding cover, the displacement sensor is arranged in the lead shielding cover, a through hole is formed in one side, close to the fluctuation pipe, of the lead shielding cover, and the through hole is used for connecting the pull rope.
3. The pipe thermal stratification displacement sensor mounting structure of claim 1, wherein: The one end that displacement sensor was kept away from to the stay cord is provided with the extension rope respectively, extend the rope with be provided with between the stay cord fixed cover, extend one end of rope in fixed cover with the stay cord is connected, just extend the rope with the stay cord with be provided with adjustment mechanism between the fixed cover in order to adjust extend the tensile length of rope, extend the rope and keep away from one end of stay cord runs through respectively the through-hole is connected the fluctuation pipe.
4. A pipe thermal stratification displacement sensor mounting structure according to claim 3, wherein: The outer correspondence of fluctuation pipe displacement sensor is provided with the staple bolt, the staple bolt with fluctuation pipe can dismantle the connection, extend the rope and keep away from the one end of fixed cover is connected with the connecting block, the connecting block set up respectively in on the staple bolt.
5. A method for detecting the installation state of a pipe thermal stratification displacement sensor applied to the pipe thermal stratification displacement sensor installation structure according to any one of claims 1 to 4, characterized by comprising the steps of: S1, respectively acquiring first initial displacement and second initial displacement of two displacement sensors when the fluctuation pipe is in a preset reference working condition; S2, applying preset excitation capable of causing radial displacement to the fluctuation pipe, and respectively collecting first real-time displacement and second real-time displacement of the two displacement sensors under excitation; S3, calculating a first displacement variation and a second displacement variation, and judging at least one of the installation direction correctness, the orthogonal installation conformity, the connection reliability and the lead shielding cover protection efficiency correlation state of the sensor based on the first displacement variation and the second displacement variation.
6. The method for detecting the installation state of a thermal stratification displacement sensor of a pipe according to claim 5, characterized by: in S3, the accuracy of the mounting direction of the sensor is determined as: judging whether the signs of the first displacement variation and the second displacement variation accord with a preset rule or not based on the expected displacement direction of the fluctuation pipe under the preset excitation; If the signs are not identical, the corresponding sensor mounting direction is judged to be wrong, and signal polarity correction or direction adjustment prompt generation is carried out.
7. The method for detecting the installation state of a thermal stratification displacement sensor of a pipe according to claim 5, characterized by: in S3, the determination of the degree of conformity of the orthogonal mounting is: Calculating a variation ratio or the reciprocal of the variation ratio, and comparing the variation ratio with a preset orthogonal judgment threshold value, wherein the variation ratio is a second displacement variation ratio and a first displacement variation; if the variation ratio is smaller than or equal to a preset orthogonal judgment threshold, or the reciprocal of the variation ratio is smaller than or equal to the preset orthogonal judgment threshold, judging that the orthogonal installation relationship meets the requirement, otherwise, judging that the orthogonality does not meet the requirement and generating an installation angle adjustment guide.
8. The method for detecting the installation state of a thermal stratification displacement sensor of a pipe according to claim 5, characterized by: In S3, the connection reliability is determined as: After the preset excitation is applied, monitoring whether the sensor output is abnormal with a continuous zero value, non-physical jump or serious deviation from an expected model; If the connection is abnormal, judging that the connection is abnormal; subsequently, a verification stimulus is applied, and if the sensor has no valid response, a connection failure is determined and an alarm is triggered.
9. The method for detecting the installation state of a thermal stratification displacement sensor of a pipe according to claim 5, characterized by: in the step S3, the protection efficiency association state of the lead shielding case is determined as follows: monitoring the background noise characteristic of the output signal of the displacement sensor under the stable working condition of the monitoring system; Establishing a correlation model of noise characteristics and running environment parameters or duration; If the noise characteristics are unexpectedly deteriorated and cannot be interpreted by the change of the working condition of the pipeline, judging that the protection efficiency of the lead shielding case is reduced or the lead shielding case is at risk of damage, and triggering inspection and early warning.
10. The method for detecting the installation state of a thermal stratification displacement sensor of a pipe according to claim 8, characterized in that: When the sensor is judged to have abnormal connection risk, synchronously analyzing the association state of the lead shielding cover; if the abnormal connection and the systematic noise degradation occur simultaneously, a checking instruction for the integrity of the lead shield and its internal wiring is generated.

Description

Pipeline thermal stratification displacement sensor mounting structure Technical Field The invention relates to the technical field of sensor installation, in particular to a pipeline thermal stratification displacement sensor installation structure. Background In the running process of the nuclear power unit, displacement monitoring of the fluctuation pipe is important to ensuring safe and stable running of the system. The traditional displacement sensor mounting mode has the problems of low mounting precision, insufficient protective performance, difficult control of mounting gaps and the like, so that the accuracy and stability of monitoring data are poor, and the severe requirements of nuclear power operation cannot be met. Meanwhile, under the complex environments of high temperature, radiation and the like, the mounting structure of the sensor needs to have good protection performance and reliable connection stability so as to ensure long-term reliable operation. The present invention therefore proposes a pipe thermal stratification displacement sensor mounting structure to ameliorate the above problems. Disclosure of Invention Therefore, the invention aims to overcome the defects of low precision and poor protection in the installation of the displacement sensor in the prior art, thereby providing a pipeline thermal stratification displacement sensor installation structure. In order to solve the problems, the invention provides a pipeline thermal stratification displacement sensor mounting structure, wherein the displacement sensors are arranged along the radial direction of a fluctuation pipe, and the pipeline thermal stratification displacement sensor mounting structure comprises a bracket, wherein the bracket is arranged along the radial direction of the fluctuation pipe, the displacement sensors are respectively arranged between the two radial directions of the fluctuation pipe and the bracket, an included angle formed by the two displacement sensors and the center of the fluctuation pipe is 90 degrees, each displacement sensor is arranged on the bracket, a pull rope is connected with each displacement sensor, and each pull rope is respectively connected with the fluctuation pipe and the corresponding displacement sensor along the radial direction of the fluctuation pipe; the support is an L-shaped support, and the distances from the two sides of the L-shaped support to the center of the fluctuation pipe are the same; The outside of the fluctuation pipe is provided with an insulating layer, the insulating layer and the fluctuation pipe are in clearance arrangement, and the insulating layer is provided with through holes along the radial direction corresponding to each displacement sensor. Preferably, the device further comprises a lead shielding cover, the displacement sensor is arranged in the lead shielding cover, a through hole is formed in one side, close to the fluctuation pipe, of the lead shielding cover, and the through hole is used for connecting the pull rope. Preferably, one end of the pull rope far away from the displacement sensor is respectively provided with an extension rope, a fixed sleeve is arranged between the extension rope and the pull rope, one end of the extension rope is connected with the pull rope in the fixed sleeve, an adjusting mechanism is arranged between the extension rope and the pull rope and the fixed sleeve to adjust the stretching length of the extension rope, and one end of the extension rope far away from the pull rope penetrates through the penetrating holes respectively to be connected with the fluctuation pipe. Preferably, the outside of the fluctuation pipe corresponds to the displacement sensor and is provided with a hoop, the hoop and the fluctuation pipe are detachably connected, one end of the extension rope, which is far away from the fixed sleeve, is connected with a connecting block, and the connecting blocks are respectively arranged on the hoop. The invention also provides a method for detecting the installation state of the pipeline thermal stratification displacement sensor, which is applied to the installation structure of the pipeline thermal stratification displacement sensor, and comprises the following steps: S1, respectively acquiring first initial displacement and second initial displacement of two displacement sensors when the fluctuation pipe is in a preset reference working condition; S2, applying preset excitation capable of causing radial displacement to the fluctuation pipe, and respectively collecting first real-time displacement and second real-time displacement of the two displacement sensors under excitation; S3, calculating a first displacement variation and a second displacement variation, and judging at least one of the installation direction correctness, the orthogonal installation conformity, the connection reliability and the lead shielding cover protection efficiency correlation state of the sensor based on the first d