A pipeline circumferential excitation detection device

Abstract

The application relates to a pipeline circumferential excitation detection device, which comprises two magnetic pole modules, the magnetic pole module comprises an iron core, at least one pair of N main magnetic poles and S main magnetic poles are symmetrically arranged on the surface of the iron core, the N main magnetic poles and the S main magnetic poles are distributed along the axial direction of the surface of the iron core, first auxiliary magnetic poles and second auxiliary magnetic poles are respectively arranged at the two ends of the iron core between the adjacent N main magnetic poles and S main magnetic poles, a sensor probe assembly is arranged between the first auxiliary magnetic poles and the second auxiliary magnetic poles, and main steel brushes are fixedly arranged on the surfaces of the N main magnetic poles and the S main magnetic poles; the iron cores of the two magnetic pole modules are axially connected through a connecting frame, and the two magnetic pole modules are cross-distributed, so that the opposite surfaces of the two magnetic pole modules are one-to-one corresponding to the second auxiliary magnetic poles respectively corresponding to the N main magnetic poles or the S main magnetic poles. The cross placement of the front and rear rows of magnetic poles realizes full coverage of the detector probe on the pipeline wall circumferential direction; and the length of the pipeline excitation detection device can be shortened through the arrangement of the auxiliary magnetic poles.

Description

Technical Field

[0001] This invention belongs to the field of pipeline inspection technology, and in particular relates to a pipeline circumferential excitation inspection device. Background Technology

[0002] Pipeline accidents are mostly caused by corrosion or deformation defects in the pipe wall. Corrosion defects are more difficult to detect than deformation defects, and corrosion defects tend to grow over time. Under prolonged high-pressure environments, the continuous growth of corrosion defects increases the safety risk to the pipeline. Therefore, more comprehensive detection of pipeline corrosion defects, as well as the diagnosis, evaluation, and risk assessment of corrosion, are of paramount importance for pipeline operational safety and even public safety.

[0003] Existing pipeline transverse excitation detectors are generally divided into two sections. If the axial excitation detector and the transverse excitation detector are directly connected, the three-section detector structure is too long, making the launch and reception of the probe difficult. Therefore, axial excitation detection and transverse excitation detection are usually performed on the pipeline separately. However, the following problems exist: (1) It is difficult to accurately align the mileage of the axial detection data and the transverse detection data, resulting in a large workload; (2) The cost of two detections is high, and the detection cycle and data analysis cycle are long. Summary of the Invention

[0004] The technical problem solved by this invention is achieved through the following technical solution:

[0005] A circumferential excitation detection device for pipelines includes two magnetic pole modules. Each magnetic pole module includes an iron core. At least one pair of N main magnetic poles and S main magnetic poles are symmetrically installed on the surface of the iron core. The N main magnetic poles and S main magnetic poles are distributed axially along the surface of the iron core. A first auxiliary magnetic pole and a second auxiliary magnetic pole are respectively installed at the two ends of the iron core between adjacent N main magnetic poles and S main magnetic poles. A sensor probe assembly is installed between the first auxiliary magnetic poles and the second auxiliary magnetic poles. A main steel brush is fixedly installed on the surface of each N main magnetic pole and S main magnetic pole.

[0006] The iron cores of the two magnetic pole modules are axially connected by a connecting frame, and the two magnetic pole modules are distributed crosswise, so that on the opposite surfaces of the two magnetic pole modules, the N main magnetic pole or the S main magnetic pole corresponds one-to-one with the second auxiliary magnetic pole.

[0007] Furthermore, there are two first auxiliary magnetic poles between adjacent N main magnetic poles and S main magnetic poles, and the polarity of the first auxiliary magnetic pole is consistent with the polarity of its adjacent N main magnetic pole or S main magnetic pole.

[0008] Furthermore, there is a second auxiliary magnetic pole between adjacent N main magnetic poles and S main magnetic poles, and the polarity of the second auxiliary magnetic pole is consistent with the polarity of the N main magnetic pole or S main magnetic pole in its corresponding magnetic pole module.

[0009] Furthermore, a first auxiliary steel brush and a second auxiliary steel brush are respectively fixedly installed on the surfaces of the first auxiliary magnetic pole and the second auxiliary magnetic pole.

[0010] Furthermore, the thickness of the first auxiliary steel brush on the side closer to the N main magnetic pole or the S main magnetic pole is greater than the thickness on the side farther away from the N main magnetic pole or the S main magnetic pole.

[0011] The thickness of the second auxiliary steel brush on the side closer to the main magnetic pole with the same polarity in the circumferential direction is greater than the thickness on the side with the opposite polarity of the main magnetic pole.

[0012] Furthermore, the outer ring surface of the N main magnetic pole or S main magnetic pole is a planar structure, and the outer ring surface of the corresponding main steel brush is also a planar structure.

[0013] Furthermore, the outer ring surfaces of the first auxiliary magnetic pole and the second auxiliary magnetic pole are arc-shaped, and the corresponding outer ring surfaces of the first auxiliary steel brush and the second auxiliary steel brush are arc-shaped.

[0014] Furthermore, after the iron cores of the two magnetic pole modules are axially connected by a connecting bracket, the sensor probe assemblies on the two magnetic pole modules are distributed crosswise.

[0015] The advantages and positive effects of this invention are:

[0016] This invention achieves circumferential magnetization of the pipe wall through the main magnetic poles arranged circumferentially on the iron core; the cross placement of the front and rear rows of magnetic poles achieves full circumferential coverage of the pipe wall by the detector probe; and the length of the pipe excitation detection device can be shortened by the arrangement of auxiliary magnetic poles. Attached Figure Description

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless specifically indicated, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the structure of the pipeline circumferential excitation detection device provided in an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the circumferential excitation detection device for pipelines provided in an embodiment of the present invention;

[0020] Figure 3 This is a front view of the structure of the pipeline circumferential excitation detection device provided in an embodiment of the present invention; Detailed Implementation

[0021] First, it should be noted that the specific structure, features, and advantages of the present invention will be described in detail below by way of examples. However, all descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single technical feature described or implied in the various embodiments mentioned herein can still be arbitrarily combined or deleted among these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned herein.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0023] like Figures 1 to 3 As shown, the present invention provides a pipeline circumferential excitation detection device, including two magnetic pole modules. Each magnetic pole module includes an iron core 4. At least one pair of N main magnetic poles 10 and S main magnetic poles 11 are symmetrically installed on the surface of the iron core. The N main magnetic poles and S main magnetic poles are distributed axially along the surface of the iron core. A first auxiliary magnetic pole and a second auxiliary magnetic pole are respectively installed at the two ends of the iron core between adjacent N main magnetic poles and S main magnetic poles. A sensor probe assembly 3 is installed between the first auxiliary magnetic poles and the second auxiliary magnetic poles. A main steel brush is fixedly installed on the surface of each of the N main magnetic poles and S main magnetic poles. A first auxiliary steel brush and a second auxiliary steel brush are fixedly installed on the surface of each of the first auxiliary magnetic poles and the second auxiliary magnetic poles, respectively.

[0024] The iron cores of the two magnetic pole modules are axially connected by the connecting frame 7, and the two magnetic pole modules are distributed crosswise, so that on the opposite surfaces of the two magnetic pole modules: the N main magnetic pole or the S main magnetic pole corresponds one-to-one with the second auxiliary magnetic pole, and after the iron cores of the two magnetic pole modules are axially connected by the connecting frame, the sensor probe assemblies on the two magnetic pole modules are distributed crosswise.

[0025] In this embodiment, there are two pairs of N-pole and S-pole main magnetic poles, spaced 90° apart. There are two first auxiliary magnetic poles between adjacent N-pole and S-pole main magnetic poles, and the polarity of each first auxiliary magnetic pole is the same as that of its adjacent N-pole or S-pole. There is one second auxiliary magnetic pole between adjacent N-pole and S-pole main magnetic poles, and the polarity of this second auxiliary magnetic pole is the same as that of the N-pole or S-pole in the opposite magnetic pole module. The second auxiliary magnetic pole is designed to be relatively long, enveloping the sensor probe assembly area. The length and shape of the second auxiliary magnetic pole mainly serve to reduce the magnetic field interaction between the front and rear rows of main magnetic poles, preventing crosstalk between the two rows of magnetic poles and shortening the distance between them. Specifically, as shown... Figure 1As shown, the N main magnetic pole, S main magnetic pole, N main magnetic pole, and S main magnetic pole are fixedly arranged on the outer surface of the iron core at 90° intervals. The polarity of the first auxiliary magnetic pole on both sides of the N main magnetic pole is N pole, and the polarity of the first auxiliary magnetic pole on both sides of the S main magnetic pole is S pole. The auxiliary magnetic poles play the role of concentrating the magnetic field.

[0026] It should be noted that the thickness of the first auxiliary steel brush on the side closer to the N main magnetic pole or the S main magnetic pole is greater than the thickness on the side farther away from the N main magnetic pole or the S main magnetic pole, specifically as follows: Figure 1 , 2 As shown, the thickness variation of the first auxiliary steel brush 2 on the first auxiliary magnetic pole 1 can be observed. This is because, according to the results of ANSYS finite element simulation, this structure can concentrate the magnetic field distribution at the sensor probe assembly and exhibit linear analysis, which is beneficial for subsequent processing of detection data. The thickness of the second auxiliary steel brush on the side closer to the main magnetic pole with the same polarity in the circumferential direction is greater than the thickness on the side with the opposite polarity of the main magnetic pole, as shown in the figure. Figure 1 As shown, the thickness variation of the second auxiliary steel brush 6 on the second auxiliary magnetic pole 5 can be seen. This is because, according to the finite element simulation analysis, the thickness variation of the second auxiliary steel brush 6 is beneficial to reducing the mutual influence of the magnetic fields between the front row main magnetic poles and the rear row main magnetic poles.

[0027] It is advisable that the outer ring surface of the N-pole or S-pole is planar, and the corresponding outer ring surface of the main steel brush is also planar. This is because planar steel brushes are relatively simple to manufacture and have lower costs. Furthermore, as... Figure 2 As shown, the main magnetic pole 8 can be made into a two-section structure, and the corresponding main steel brush 9 is also two-section. This is because the manufacturing capacity of the magnetic pole is limited. If the magnetic pole is too large, the manufacturing difficulty and magnetization difficulty will be greatly increased. In addition, the segmented structure is also convenient for the installation of the magnetic pole and the steel brush. Since the distance between the first auxiliary magnetic pole and the second auxiliary magnetic pole in the circumferential direction is small, it is easy to process and the cost is low. It can be considered that the outer ring surface of the first auxiliary magnetic pole and the second auxiliary magnetic pole is an arc-shaped structure, and the outer ring surface of the corresponding first auxiliary steel brush and the second auxiliary steel brush is an arc-shaped structure.

[0028] The circumferential excitation detection device for pipelines of the present invention places two rows of magnetic poles on a section of iron core. The auxiliary magnetic poles shorten the axial length of each magnetic pole, and a single section of magnets achieves full circumferential coverage. The device contacts the inner wall of the pipeline through a steel brush, reducing wear on the inner wall and protecting the inner coating. The sensor probe assembly is located between the main magnetic poles, and the two rows of sensor probe assemblies are placed crosswise to achieve 360-degree full circumferential coverage, effectively shortening the overall axial length of the detector.

[0029] It should be noted that the N-type and S-type main magnetic poles are symmetrically distributed around the circumference of the pipe. The number of main magnetic poles distributed around the circumference can be determined according to the pipe diameter. The tight connection between the steel brush and the pipe reduces wear on the inner wall of the pipe and protects the inner coating.

[0030] The above embodiments have provided a detailed description of the present invention, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A circumferential excitation detection device for pipelines, characterized in that: It includes two magnetic pole modules, each including an iron core. At least one pair of N main magnetic poles and S main magnetic poles are symmetrically mounted on the surface of the iron core. The N main magnetic poles and S main magnetic poles are distributed axially along the surface of the iron core. A first auxiliary magnetic pole and a second auxiliary magnetic pole are respectively installed at the two ends of the iron core between adjacent N main magnetic poles and S main magnetic poles. A sensor probe assembly is installed between the first auxiliary magnetic poles and the second auxiliary magnetic poles. A main steel brush is fixedly installed on the surface of each N main magnetic pole and S main magnetic pole. The iron cores of the two magnetic pole modules are axially connected by a connecting frame, and the two magnetic pole modules are distributed crosswise, so that on the opposite surfaces of the two magnetic pole modules: the N main magnetic pole or the S main magnetic pole corresponds one-to-one with the second auxiliary magnetic pole, and the sensor probe assemblies on the two magnetic pole modules are distributed crosswise. Among them, there are two first auxiliary magnetic poles between adjacent N main magnetic poles and S main magnetic poles, and the polarity of the first auxiliary magnetic pole is the same as that of its adjacent N main magnetic pole or S main magnetic pole. There is a second auxiliary magnetic pole between adjacent N main magnetic poles and S main magnetic poles, and the polarity of the second auxiliary magnetic pole is consistent with the polarity of the N main magnetic pole or S main magnetic pole in the corresponding magnetic pole module. The second auxiliary magnetic pole is designed to be relatively long, forming a wrapping effect on the sensor probe assembly area, so as to reduce the magnetic field interaction between the front row of main magnetic poles and the back row of main magnetic poles and prevent crosstalk between the front and back rows of magnetic poles. A first auxiliary steel brush and a second auxiliary steel brush are respectively fixedly installed on the surfaces of the first auxiliary magnetic pole and the second auxiliary magnetic pole; The thickness of the first auxiliary steel brush on the side closer to the N main magnetic pole or the S main magnetic pole is greater than the thickness on the side farther away from the N main magnetic pole or the S main magnetic pole. The thickness of the second auxiliary steel brush on the side closer to the main magnetic pole with the same polarity in the circumferential direction is greater than the thickness on the side with the opposite polarity of the main magnetic pole.

2. The pipeline circumferential excitation detection device according to claim 1, characterized in that: The outer ring surface of the N main magnetic pole or S main magnetic pole is a planar structure, and the outer ring surface of the corresponding main steel brush is also a planar structure.

3. The pipeline circumferential excitation detection device according to claim 1, characterized in that: The outer ring surfaces of the first auxiliary magnetic pole and the second auxiliary magnetic pole are arc-shaped, and the outer ring surfaces of the corresponding first auxiliary steel brush and the second auxiliary steel brush are also arc-shaped.

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