Pipeline thermal stratification displacement sensor mounting structure

Abstract

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

Description

Technical Field

[0001] This invention relates to the field of sensor installation technology, and specifically to a pipe thermal stratification displacement sensor installation structure. Background Technology

[0002] During the operation of nuclear power units, displacement monitoring of the flume pipe is crucial for ensuring the safe and stable operation of the system. Traditional displacement sensor installation methods suffer from problems such as low installation accuracy, insufficient protection, and difficulty in controlling installation gaps, resulting in poor accuracy and stability of monitoring data, which cannot meet the stringent requirements of nuclear power operation. Furthermore, in complex environments such as high temperature and radiation, the sensor installation structure must possess good protection performance and reliable connection stability to ensure long-term reliable operation. Therefore, this invention proposes a pipe thermal stratification displacement sensor installation structure to improve the above-mentioned problems. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low accuracy and poor protection in the installation of displacement sensors in the prior art, thereby providing a pipe thermal stratification displacement sensor installation structure.

[0004] To address the aforementioned problems, this invention provides a pipe thermal stratification displacement sensor installation structure. The displacement sensor is arranged along the radial direction of the wave pipe and includes: a bracket, the bracket being arranged along the radial direction of the wave pipe, and displacement sensors being respectively arranged between the two radial directions of the wave pipe and the bracket, with the included angle between the two displacement sensors and the center of the wave pipe being 90°. Each displacement sensor is mounted on the bracket and is connected to a pull rope, with each pull rope connecting the wave pipe and the corresponding displacement sensor along the radial direction of the wave pipe. The support is an L-shaped support, and the two sides of the L-shaped support are equidistant from the center of the wave tube; An insulation layer is provided outside the wave tube, and a gap is provided between the insulation layer and the wave tube. The insulation layer has a through hole along the radial direction for each displacement sensor.

[0005] Preferably, it further includes: a lead shield, the displacement sensor is disposed inside the lead shield, and the lead shield has a through hole on the side near the oscillating tube, the through hole being used for connecting the pull rope.

[0006] Preferably, an extension rope is provided at the end of the pull rope away from the displacement sensor, a fixing sleeve is provided between the extension rope and the pull rope, one end of the extension rope is connected to the pull rope inside the fixing sleeve, and an adjustment mechanism is provided between the extension rope, the pull rope and the fixing sleeve to adjust the length of the extension rope stretching, and the end of the extension rope away from the pull rope passes through the through hole and connects to the wave tube.

[0007] Preferably, a clamp is provided on the outside of the wave tube corresponding to the displacement sensor, the clamp and the wave tube are detachably connected, and a connecting block is connected to the end of the extension rope away from the fixed sleeve, the connecting block being respectively disposed on the clamp.

[0008] The present invention also provides a method for detecting the installation status of a pipeline thermal stratification displacement sensor, using the pipeline thermal stratification displacement sensor installation structure described in any of the preceding claims, comprising the following steps: S1. Under the preset reference operating conditions of the wave tube, the first initial displacement and the second initial displacement of the two displacement sensors are collected respectively; S2. Apply a preset excitation that can cause radial displacement to the wave tube, and collect the first real-time displacement and the second real-time displacement of the two displacement sensors under the excitation respectively; S3. Calculate the first displacement change and the second displacement change, and determine at least one of the following based on the first displacement change and the second displacement change: the correctness of the sensor's installation direction, the orthogonal installation compliance, the connection reliability, and the protective effectiveness of the lead shield.

[0009] Preferably, the determination of the correctness of the sensor's installation orientation in step S3 is as follows: Based on the expected displacement direction of the wave tube under the preset excitation, determine whether the signs of the first displacement change and the second displacement change conform to the preset rules. If the symbol does not match, the corresponding sensor is determined to be installed in the wrong direction, and signal polarity correction or direction adjustment prompt is generated.

[0010] Preferably, the determination of orthogonal installation compliance in S3 is as follows: Calculate the ratio of changes or the reciprocal of the ratio of changes, and compare it with a preset orthogonal judgment threshold; wherein, the ratio of changes is the ratio of the change in the second displacement to the change in the first displacement; If the ratio of changes is less than or equal to the preset orthogonality judgment threshold, or the reciprocal of the ratio of changes is less than or equal to the preset orthogonality judgment threshold, then the orthogonal installation relationship is determined to meet the requirements; otherwise, the orthogonality is determined to not meet the requirements and an installation angle adjustment guide is generated.

[0011] Preferably, the determination of connection reliability in S3 is as follows: After applying the preset excitation, monitor whether the sensor output shows a continuous zero value, a non-physical jump, or an anomaly that deviates significantly from the expected model; If an anomaly occurs, it is determined that there is a risk of connection failure. A verification stimulus is then applied. If the sensor still does not respond effectively, the connection is determined to be faulty and an alarm is triggered.

[0012] Preferably, the determination of the protective effectiveness correlation status of the lead shield in S3 is as follows: Under stable operating conditions of the monitoring system, the background noise characteristics of the output signal of the monitoring displacement sensor are analyzed. Establish a correlation model between noise characteristics and operating environment parameters or duration; If the noise characteristics deteriorate unexpectedly and cannot be explained by changes in pipeline operating conditions, it is determined that the protective effectiveness of the lead shield has decreased or there is a risk of damage, and an inspection warning is triggered.

[0013] Preferably, it also includes: when it is determined that there is a risk of abnormal connection of the sensor, simultaneously analyzing the correlation status of the lead shield; If a connection anomaly occurs simultaneously with systemic noise degradation, an inspection command is generated to check the integrity of the lead shield and its internal wiring.

[0014] The pipe thermal stratification displacement sensor mounting structure provided by this invention has the following beneficial effects: This invention enables all-round, high-precision monitoring of displacement changes in the wave tube by setting displacement sensors in two vertical radial directions of the wave tube and cooperating with symmetrical L-shaped brackets; the lead shield effectively prevents radiation interference and ensures the normal operation of the displacement sensors; the cooperation between the insulation layer and the installation structure meets the installation gap requirements and provides an installation channel for the pull rope. This invention also applies a controllable simulated excitation to the wave tube and analyzes the response data of the displacement sensor to accurately determine the correctness of the sensor's installation direction, the orthogonal installation compliance, and the reliability of the mechanical connection. This elevates the installation quality inspection from subjective experience judgment to objective data-driven judgment, significantly improving the accuracy and consistency of the detection. This invention also diagnoses the integrity or performance degradation of lead shielding by monitoring the background noise characteristics of sensor signals and performing correlation analysis with parameters such as environmental radiation. It provides a non-invasive, online predictive maintenance method for condition monitoring, which can issue early warnings before physical damage or severe performance degradation occurs, avoiding monitoring function interruption and safety risks caused by interference or damage to the sensor cluster due to shielding failure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall assembly of the installation structure of the present invention; Figure 2 This is a schematic diagram of the installation of the fixing sleeve structure of the installation structure of the present invention; Figure 3 This is a schematic diagram of the installation of the connecting block structure of the installation structure of the present invention; Figure 4 This is a side view of the mounting structure of the present invention.

[0016] The reference numerals in the attached figures are as follows: 1. Flushing tube; 2. L-shaped bracket; 3. Pull rope; 4. Lead shield; 5. Insulation layer; 6. Extension rope; 7. Fixing sleeve; 8. Clamp; 9. Connecting block. Detailed Implementation

[0017] like Figure 1-4 As shown, this invention provides a pipe thermal stratification displacement sensor installation structure. The displacement sensor is arranged along the radial direction of the wave pipe 1, including: a bracket, the bracket being arranged along the radial direction of the wave pipe 1, and displacement sensors being respectively arranged between the two radial directions of the wave pipe 1 and the bracket, with the included angle between the two displacement sensors and the center of the wave pipe 1 being 90°. Each displacement sensor is mounted on the bracket, and each displacement sensor is connected to a pull rope 3. Each pull rope 3 is respectively connected to the wave pipe 1 and the corresponding displacement sensor along the radial direction of the wave pipe 1. Figure 1-4 As shown, in the actual installation process, the installation position of the bracket is first determined according to the size and installation position of the wave tube 1. The bracket and the ground or wall near the wave tube 1 are connected by bolts, ensuring that the distance from the two sides of the bracket to the center of the wave tube 1 is the same, and the bracket is set along the radial direction of the wave tube 1. Two displacement sensors are installed on the bracket respectively, so that the included angle between the two displacement sensors and the center of the wave tube 1 is 90°. The displacement sensors are protected by lead shields 4. The connection between the lead shields 4 and the bracket can be bolted or snapped. The displacement sensors and the wave tube 1 are connected by pull ropes 3. Each pull rope 3 connects the wave tube 1 and the corresponding displacement sensor along the radial direction of the wave tube 1. Through this structural design, the displacement change of the wave tube 1 can be monitored simultaneously from two vertical directions, improving the comprehensiveness and accuracy of the monitoring data and meeting the safety monitoring requirements during the operation of the nuclear power unit.

[0018] The displacement sensor is commercially available. When the wave tube is displaced, the displacement of the pull rope is transmitted to the displacement sensor. The measuring component inside the sensor converts the linear displacement of the pull rope into an electrical signal or a digital signal. The signal is transmitted to the computer processing system. After analysis and calculation, the displacement data of the wave tube is finally obtained, realizing real-time monitoring of the displacement of the wave tube.

[0019] In some embodiments, the support is an L-shaped support 2, and the two sides of the L-shaped support 2 are equidistant from the center of the wave tube 1. For example... Figure 1-4 As shown, the support is an L-shaped support 2, with the two sides of the L-shaped support 2 being perpendicular to each other. The distance from the center of the wave tube 1 to the two sides of the L-shaped support 2 is the same. The L-shaped support 2 not only facilitates the installation of displacement sensors, but also ensures that the relative positions of the two displacement sensors and the wave tube 1 are symmetrical, further improving the monitoring accuracy.

[0020] In some embodiments, the system further includes a lead shield 4, inside which the displacement sensor is disposed, and a through hole is provided on the side of the lead shield near the oscillating tube 1 for connecting the pull rope 3. Figure 1-4 As shown, the lead shield 4 can effectively block radiation, protect the displacement sensor from radiation interference, and ensure the stable operation of the displacement sensor. The material is 304 stainless steel. Its pull rope 3 is connected to the displacement sensor inside the lead shield 4 through the through hole for displacement monitoring.

[0021] In some embodiments, a heat insulation layer 5 is provided outside the wave tube 1, with a gap between the heat insulation layer 5 and the wave tube 1. The heat insulation layer 5 has a through hole along the radial direction corresponding to each displacement sensor. For example... Figure 1-4 As shown, the insulation layer 5 has a thickness of 130mm. The insulation layer 5 serves to insulate the wave tube 1. The gap between the insulation layer 5 and the wave tube 1 is set to meet the installation requirements, and the through hole is set to provide a channel for the pull rope 3 to connect to the wave tube 1, ensuring the integrity of the installation structure.

[0022] In some embodiments, an extension rope 6 is provided at the end of the pull rope 3 furthest from the displacement sensor. A fixing sleeve 7 is provided between the extension rope 6 and the pull rope 3. One end of the extension rope 6 is connected to the pull rope 3 inside the fixing sleeve 7. An adjustment mechanism is provided between the extension rope 6, the pull rope 3, and the fixing sleeve 7 to adjust the length of the extension rope 6. The end of the extension rope 6 furthest from the pull rope 3 passes through the through hole and connects to the wave tube 1. Figure 1-4As shown, the length of the extension rope 6 can be adjusted according to the actual installation conditions on site via the adjustment mechanism to ensure that the pull rope 3 is always in a suitable tension state, thus guaranteeing the accuracy of displacement monitoring. The fixed sleeve 7 provides storage space for the extension rope 6. The adjustment mechanism is used to adjust the distance between the displacement sensor and the oscillation tube 1 according to the actual site conditions. Commercially available materials can be provided, such as an axial central shaft hole in the fixed sleeve 7 for installing a rope winding shaft, a brake button groove on the outer side, a spring mounting groove at one end of the rope winding shaft, and an external thread at the other end for fixing. A deep spiral groove is formed circumferentially to prevent the extension rope 6 from overlapping and tangling. One end of the spring is fixed in the rope winding shaft groove with a pin, and the other end hooks onto a fixing post inside the fixed sleeve 7. The brake button has anti-slip texture on the top and a connecting rod at the bottom. The rod connects to the stop pawl, and the ratchet assembly is interference-fitted and fixed in the middle of the rope winding shaft, concentric with the central shaft. The stop pawl is installed inside the fixed sleeve 7 via a torsion spring. Under normal conditions, the pawl head is locked in the ratchet teeth. When the button is pressed, the connecting rod pushes the stop pawl to disengage from the ratchet, thus unlocking the rope. During use, when it is necessary to extend the rope, hold the fixed sleeve 7 and pull the extension rope 6 outward. The rotation of the rope winding shaft drives the coil spring to store energy, and the guide groove at the rope outlet ensures that the rope extends in a straight line. When it is necessary to lock the length, release the extension rope 6, and the stop pawl automatically locks the ratchet (because the torsion spring resets), and the rope maintains a fixed length. When it is necessary to unlock and retract the rope, press the brake button, the stop pawl disengages from the ratchet, the coil spring releases energy, and drives the rope winding shaft to retract the rope. During the retraction, the hand can lightly hold the rope for guidance to avoid tangling.

[0023] In some embodiments, a clamp 8 is provided on the outside of the oscillating tube 1 corresponding to the displacement sensor. The clamp 8 and the oscillating tube 1 are detachably connected. The end of the extension rope 6 away from the fixing sleeve 7 is connected to a connecting block 9, and the connecting block 9 is respectively disposed on the clamp 8. Figure 1-4 As shown, the design of clamp 8 and connecting block 9 enables a reliable connection between extension rope 6 and wave tube 1. The detachable clamp 8 facilitates installation and maintenance. The connection between extension rope 6 and connecting block 9 can be achieved by snap-fit ​​or bolt connection, and the connection between connecting block 9 and clamp 8 can also be achieved by snap-fit ​​or bolt connection. This allows for stable fixation on wave tube 1 to monitor its displacement changes. Clamp 8 is commercially available, and the detachable connection between clamp 8 and connecting block 9 facilitates installation and subsequent maintenance.

[0024] Specifically, the displacement sensor installed on the side relative to the support needs to be equipped with a temporary protective device, which uses a channel steel support and a protective plate to protect the lead shield 4 for high temperature protection.

[0025] This application enables comprehensive and high-precision monitoring of displacement changes in the wave tube 1 by installing displacement sensors in two vertical radial directions of the wave tube 1, in conjunction with symmetrical L-shaped brackets. The lead shield 4 effectively prevents radiation interference and ensures the normal operation of the displacement sensors. The insulation layer 5 and the installation structure meet the installation gap requirements and provide an installation channel for the pull rope 3. The extension rope 6 and adjustment mechanism of the pull rope 3 allow for length adjustment according to on-site conditions. The detachable connection of the clamp 8 and connecting block 9 facilitates installation and subsequent maintenance.

[0026] This invention also provides a method for detecting the installation status of a pipeline thermal stratification displacement sensor, applied to the pipeline thermal stratification displacement sensor installation structure described in any of the preceding claims, comprising the following steps: S1. Under the preset reference operating conditions of the wave tube, the first initial displacement and the second initial displacement of the two displacement sensors are collected respectively; S2. Apply a preset excitation that can cause radial displacement to the wave tube, and collect the first real-time displacement and the second real-time displacement of the two displacement sensors under the excitation respectively; S3. Calculate the first displacement change and the second displacement change, and determine at least one of the following based on the first displacement change and the second displacement change: the correctness of the sensor's installation direction, the orthogonal installation compliance, the connection reliability, and the protective effectiveness of the lead shield.

[0027] Specifically, the waveguide is controlled under a preset reference operating condition, such as being shut down and cooled to ambient temperature or operating under a known stable condition without significant thermal stratification. At this time, the data acquisition unit of the monitoring system reads and records the output values ​​of displacement sensors installed in two orthogonal radial directions, respectively denoted as the first initial displacement and the second initial displacement, to establish a reference zero point for detection. Then, a controllable, preset excitation that clearly causes radial displacement is applied to the waveguide. The implementation of this excitation may include, but is not limited to: adjusting the fluid temperature inside the waveguide, for example, injecting a fluid with a certain temperature difference into one of the loops to create a controllable temperature gradient field simulating thermal stratification locally in the waveguide; or applying a small mechanical displacement of known direction and magnitude (e.g., along the sensor axis) to the outer wall of the waveguide through a calibrated external actuator (such as a hydraulic cylinder or a motor-driven push rod). After applying the excitation, the data acquisition unit again reads the output values ​​of the displacement sensors, denoted as the first real-time displacement and the second real-time displacement. Calculate the displacement changes of the two sensors before and after excitation: Based on the values, signs, and relationships of the first and second displacement changes, continue to execute one or more of the following decision sub-processes.

[0028] In some embodiments, the determination of the correctness of the sensor's installation orientation in step S3 is as follows: Based on the expected displacement direction of the wave tube under the preset excitation, determine whether the signs of the first displacement change and the second displacement change conform to the preset rules. If the symbol does not match, the corresponding sensor is determined to be installed in the wrong direction, and signal polarity correction or direction adjustment prompt is generated.

[0029] Specifically, the installation direction determination sub-process is executed: the preset excitation should cause the wave tube to produce a known displacement; for example, if a positive thermal expansion excitation is applied along the axis of the first sensor, the sensor should theoretically read a positive change, while the change of the orthogonal second sensor should be close to zero; check the signs of the first displacement change and the second displacement change; if the first displacement change is negative, while it should be positive, it is determined that the installation direction of the first sensor (e.g., the fixing direction of the pull rope or the orientation of the sensor itself) may be reversed.

[0030] If the orientation is determined to be incorrect, the control unit of the monitoring system can perform software correction, that is, multiply the reading of the first sensor by -1 in all subsequent calculations; at the same time, an alarm or prompt message can be generated on the human-machine interface (terminal computer): if the installation orientation of the first sensor is suspected to be reversed, a physical inspection will be performed.

[0031] In some implementations, the determination of orthogonal installation compliance in step S3 is as follows: Calculate the ratio of changes or the reciprocal of the ratio of changes, and compare it with a preset orthogonality judgment threshold; wherein, the ratio of changes is the ratio of the change of the second displacement to the change of the first displacement; wherein, when the excitation is mainly along the axis of the first sensor, theoretically the orthogonal second sensor should have no significant output; the orthogonality judgment threshold is a small orthogonality judgment threshold, the specific value of which can be calibrated according to the sensor accuracy and the target requirements of the monitoring system; If the ratio of changes is less than or equal to the preset orthogonality judgment threshold, or the reciprocal of the ratio of changes is less than or equal to the preset orthogonality judgment threshold, the orthogonal installation relationship is deemed to meet the requirements, and the orthogonality of the second sensor relative to the first sensor is considered to be good; otherwise, the orthogonality is deemed not to meet the requirements and an installation angle adjustment guide is generated, indicating that the actual installation axial angle between the two sensors is significantly deviated from 90 degrees, and a prompt is generated that the orthogonality deviation between the first sensor and the second sensor exceeds the standard, and the installation angle of the L-shaped bracket or the fixed position of the sensor on the bracket is checked and adjusted.

[0032] In some implementations, the determination of connection reliability in S3 is as follows: After applying the preset excitation, monitor whether the sensor output shows a continuous zero value, a non-physical jump, or an anomaly that deviates significantly from the expected model; If an anomaly occurs, it is determined that there is a risk of connection failure. Subsequently, a verification stimulus is applied. If the sensor still does not respond effectively, the connection is determined to be faulty and an alarm is triggered. Specifically, after S2 collects the first and second real-time displacements and during continuous monitoring, the data characteristics are analyzed: if a sensor reading is consistently 0 or fluctuates within a very small noise band, it indicates that the pull rope or extension rope has come loose and the sensor has not sensed any displacement; if the reading shows a sudden large jump followed by recovery, or the signal is interrupted, it means that the connection is loose and poor contact has occurred; if the trend of the reading change (such as the curve of change over time) is seriously inconsistent with the expected displacement curve calculated based on the heat transfer model and structural mechanics (e.g., the correlation coefficient is less than 0.7), it indicates that there is slippage or nonlinear resistance in the connection; if any of the above abnormal modes occur, the sensor is marked as having a connection abnormality risk.

[0033] Specifically, for sensors marked as high-risk, different modes of verification stimulation are applied, such as applying stimulation again in the opposite direction. If the sensor output still does not change significantly, and the absolute value of the change is less than a preset response threshold, such as 1% of the sensor's full scale, it can be diagnosed that the sensor connection has failed, for example, due to a broken pull cord or loose clamp; the monitoring system then triggers a high-level alarm, indicating sensor connection failure, and the monitoring function is terminated.

[0034] In some embodiments, the determination of the protective effectiveness correlation status of the lead shield in S3 is as follows: Under stable operating conditions of the monitoring system, the background noise characteristics of the output signal of the monitoring displacement sensor are analyzed. Establish a correlation model between noise characteristics and operating environment parameters or duration; If the noise characteristics deteriorate unexpectedly and cannot be explained by changes in pipeline operating conditions, it is determined that the protective effectiveness of the lead shield has decreased or there is a risk of damage, and an inspection warning is triggered.

[0035] Specifically, during periods of stable operation of the waveguide tube without drastic temperature changes, raw signals from the first and second sensors are continuously collected. Characteristic indicators of the signals are calculated, such as the root mean square (RMS) value of background noise in the 0-10Hz low-frequency band, or the slow drift of the signal baseline over several hours. Historical data of these characteristic indicators are used to establish trend models with operating time, or correlation analysis is performed with instantaneous dose rate data of the same area obtained from the power plant's radiation monitoring system. If a stepwise increase or a continuous upward trend in the sensor's background noise RMS value is detected, and this change cannot be explained by concurrent changes in the waveguide tube's temperature, pressure, vibration, or other operating conditions, and if this noise increase is time-dependent on the increase in radiation dose rate, then the integrity of the surface lead shield is compromised (e.g., cracks appear or the cover is not properly sealed), leading to more radiation penetration and interference with the sensor's internal sensitive circuitry. The monitoring system generates an early warning: if an abnormal increase in sensor signal background noise is detected, suggesting a possible decrease in the protective effectiveness of the lead shield, then an appearance and sealing inspection is performed.

[0036] In some implementations, it also includes: When it is determined that there is a risk of abnormal connection of the sensor, the associated status of the lead shielding cover is analyzed simultaneously. If connection anomalies and systemic noise degradation occur simultaneously, an inspection command is generated targeting the integrity of the lead shield and its internal wiring. When the monitoring system simultaneously triggers a connection anomaly risk alarm and a warning of decreased protective effectiveness of the lead shield, a comprehensive diagnostic logic is executed: If only a single sensor exhibits a connection anomaly, while another sensor's signal is normal and the system noise level is stable, the anomaly is due to a mechanical connection anomaly in that sensor itself. If two sensors simultaneously or successively exhibit signal anomalies (such as intermittent jumps), and the overall system background noise characteristics also show degradation, it cannot simply indicate two independent mechanical faults; rather, it indicates a failure of the common protective function of the lead shield, causing interference to the electronic circuitry of all internal sensors, manifesting as signal anomalies. In this case, the monitoring system should prioritize outputting inspection commands targeting common factors: if multiple sensor signal anomalies are detected accompanied by increased system noise, the overall integrity of the lead shield and the tightness and shielding status of all internal sensor cable connectors should be checked first.

[0037] This application applies a controllable simulated excitation to the wave tube and analyzes the response data of the displacement sensor to accurately determine the correctness of the sensor's installation direction, the orthogonal installation compliance, and the reliability of the mechanical connection. This elevates the installation quality inspection from subjective experience judgment to objective data-driven judgment, significantly improving the accuracy and consistency of the inspection. This application diagnoses the integrity or performance degradation of lead shielding by monitoring the background noise characteristics of sensor signals and performing correlation analysis with parameters such as environmental radiation. It provides a non-invasive, online predictive maintenance method for condition monitoring, which can issue early warnings before physical damage or severe performance degradation occurs, avoiding monitoring function interruption and safety risks caused by interference or damage to the sensor cluster due to shielding failure.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A pipe thermal stratification displacement sensor mounting structure, wherein the displacement sensor is arranged along the radial direction of the fluctuating pipe, characterized in that, include: A support is provided along the radial direction of the wave tube. Displacement sensors are respectively arranged between the two radial directions of the wave tube and the support, and the angle formed by the two displacement sensors and the center of the wave tube is 90°. Each displacement sensor is arranged on the support and is connected to a pull rope. Each pull rope is connected to the wave tube and the corresponding displacement sensor along the radial direction of the wave tube. The support is an L-shaped support, and the two sides of the L-shaped support are equidistant from the center of the wave tube; An insulation layer is provided outside the wave tube, and a gap is provided between the insulation layer and the wave tube. The insulation layer has a through hole along the radial direction for each displacement sensor.

2. The pipeline thermal stratification displacement sensor mounting structure according to claim 1, characterized in that: It also includes: a lead shield, the displacement sensor is disposed inside the lead shield, and the lead shield has a through hole on the side near the wave tube, the through hole being used for connecting the pull rope.

3. The pipe thermal stratification displacement sensor mounting structure according to claim 1, characterized in that: The end of the pull rope away from the displacement sensor is provided with an extension rope. A fixing sleeve is provided between the extension rope and the pull rope. One end of the extension rope is connected to the pull rope inside the fixing sleeve. An adjustment mechanism is provided between the extension rope, the pull rope and the fixing sleeve to adjust the length of the extension rope. The end of the extension rope away from the pull rope passes through the through hole and is connected to the wave tube.

4. The pipe thermal stratification displacement sensor mounting structure according to claim 3, characterized in that: A clamp is provided on the outside of the wave tube corresponding to the displacement sensor. The clamp and the wave tube are detachably connected. A connecting block is connected to the end of the extension rope away from the fixed sleeve. The connecting blocks are respectively provided on the clamp.

5. A method for detecting the installation status of a pipeline thermal stratification displacement sensor, applied to the pipeline thermal stratification displacement sensor installation structure as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Under the preset reference operating conditions of the wave tube, the first initial displacement and the second initial displacement of the two displacement sensors are collected respectively; S2. Apply a preset excitation that can cause radial displacement to the wave tube, and collect the first real-time displacement and the second real-time displacement of the two displacement sensors under the excitation respectively; S3. Calculate the first displacement change and the second displacement change, and determine at least one of the following based on the first displacement change and the second displacement change: the correctness of the sensor's installation direction, the orthogonal installation compliance, the connection reliability, and the protective effectiveness of the lead shield.

6. The method for detecting the installation status of a pipeline thermal stratification displacement sensor according to claim 5, characterized in that: The determination of the correctness of the sensor's installation orientation in S3 is as follows: Based on the expected displacement direction of the wave tube under the preset excitation, determine whether the signs of the first displacement change and the second displacement change conform to the preset rules. If the symbol does not match, the corresponding sensor is determined to be installed in the wrong direction, and signal polarity correction or direction adjustment prompt is generated.

7. The method for detecting the installation status of a pipeline thermal stratification displacement sensor according to claim 5, characterized in that: The determination of orthogonal installation compliance in S3 is as follows: Calculate the ratio of changes or the reciprocal of the ratio of changes, and compare it with a preset orthogonal judgment threshold; wherein, the ratio of changes is the ratio of the change in the second displacement to the change in the first displacement; If the ratio of changes is less than or equal to the preset orthogonality judgment threshold, or the reciprocal of the ratio of changes is less than or equal to the preset orthogonality judgment threshold, then the orthogonal installation relationship is determined to meet the requirements; otherwise, the orthogonality is determined to not meet the requirements and an installation angle adjustment guide is generated.

8. The method for detecting the installation status of a pipeline thermal stratification displacement sensor according to claim 5, characterized in that: The connection reliability is determined in S3 as follows: After applying the preset excitation, monitor whether the sensor output shows a continuous zero value, a non-physical jump, or an anomaly that deviates significantly from the expected model; If an anomaly occurs, it is determined that there is a risk of connection failure. A verification stimulus is then applied. If the sensor still does not respond effectively, the connection is determined to be faulty and an alarm is triggered.

9. The method for detecting the installation status of a pipeline thermal stratification displacement sensor according to claim 5, characterized in that: The determination of the protective effectiveness correlation status of the lead shield in S3 is as follows: Under stable operating conditions of the monitoring system, the background noise characteristics of the output signal of the monitoring displacement sensor are analyzed. Establish a correlation model between noise characteristics and operating environment parameters or duration; If the noise characteristics deteriorate unexpectedly and cannot be explained by changes in pipeline operating conditions, it is determined that the protective effectiveness of the lead shield has decreased or there is a risk of damage, and an inspection warning is triggered.

10. The method for detecting the installation status of a pipeline thermal stratification displacement sensor according to claim 8, characterized in that: It also includes: when a sensor is determined to have a risk of connection abnormality, simultaneously analyze the associated status of the lead shielding cover; If a connection anomaly occurs simultaneously with systemic noise degradation, an inspection command is generated to check the integrity of the lead shield and its internal wiring.

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