Pipeline magnetic flux leakage internal detector magnetic circuit structure and detection equipment

Abstract

This utility model discloses a magnetic circuit structure and detection device for a pipeline magnetic flux leakage detector, relating to the technical field of pipeline detection equipment. The magnetic circuit structure of the pipeline magnetic flux leakage detector includes: a fixed shaft; a yoke connected to the fixed shaft and parallel to it; a first magnet located at a first end on the outer periphery of the yoke, with its N and S poles arranged radially along the fixed shaft; a second magnet located at a second end on the outer periphery of the yoke, with the first and second magnets at the same distance from the fixed shaft, and the S and N poles of the second magnet arranged radially along the fixed shaft, with the N poles of the first and second magnets arranged in opposite directions; and an intermediate magnet located on the outer periphery of the yoke and between the first and second magnets, with the distance between the intermediate magnet and the fixed shaft being less than the distance between the first magnet and the fixed shaft. The magnetic circuit structure and detection device for a pipeline magnetic flux leakage detector provided by this application can improve the accuracy of pipeline detection results.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline inspection equipment, and more specifically, to a magnetic circuit structure for a pipeline magnetic flux leakage detector. Furthermore, this utility model also relates to an inspection device including the aforementioned magnetic circuit structure for a pipeline magnetic flux leakage detector. Background Technology

[0002] Pipeline inspection refers to the process of placing a specialized detector (commonly known as a "smart pig" or "pipeline cleaner") into an operating pipeline, allowing it to move along with the transported medium. Through built-in sensors, it collects real-time data on the condition of the pipe wall, thereby detecting potential hazards such as corrosion, cracks, geometric deformation, and weld defects, and accurately locating and quantifying these defects.

[0003] The current magnetic circuit of the pipeline detector consists of a yoke, two north and south pole magnets, a rigid brush, and the pipeline. For magnetic leakage detection, the pipe wall must be saturated with magnetization in order to effectively detect the leakage magnetic field at the defect. This method can achieve saturation magnetization for most pipelines, but for small pipelines or pipelines with large wall thickness, the pipe wall cannot be magnetized due to the influence of space, rigid brush density and length, and thus cannot obtain accurate detection results.

[0004] In conclusion, improving the accuracy of test results is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a magnetic circuit structure for a pipeline leakage magnetic field detector. Through the combined action of the first magnet, the second magnet and the intermediate magnet, the magnetic circuit channels can be increased, and they can work together to magnetize the pipe wall, thereby effectively magnetizing the pipe wall and improving the accuracy of the detection results.

[0006] Another objective of this invention is to provide a detection device that includes the magnetic circuit structure of the above-mentioned pipeline leakage magnetic field detector.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A magnetic circuit structure for a pipeline magnetic flux leakage detector includes:

[0009] A fixed shaft, used for insertion into a pipe;

[0010] The yoke is connected to the fixed shaft and the two are parallel to each other.

[0011] A first magnet is disposed at the first end of the outer periphery of the yoke, and the N pole and S pole of the first magnet are arranged radially along the fixed axis.

[0012] The second magnet is disposed at the second end of the outer periphery of the yoke. The distance between the first magnet, the second magnet and the fixed shaft is the same. The S pole and N pole of the second magnet are arranged radially along the fixed shaft, and the N pole of the first magnet and the N pole of the second magnet are arranged in opposite directions.

[0013] An intermediate magnet is disposed on the outer periphery of the yoke and located between the first magnet and the second magnet. The distance between the intermediate magnet and the fixed shaft is less than the distance between the first magnet and the fixed shaft. The N pole of the intermediate magnet is correspondingly disposed with the first magnet, and the S pole is correspondingly disposed with the second magnet.

[0014] Preferably, the device further includes a probe groove and a probe, wherein the probe groove is disposed on the outer periphery of the yoke and extends along the length direction of the yoke, and the probe is disposed within the probe groove.

[0015] Preferably, the two ends of the yoke are respectively provided with a first connecting block and a second connecting block, and both the first connecting block and the second connecting block are non-magnetic components.

[0016] Preferably, the yoke is provided with a plurality of yokes and is evenly distributed on the outer periphery of the fixed shaft, and each yoke surface is provided with the first magnet, the second magnet and the intermediate magnet.

[0017] Preferably, both the first connecting block and the second connecting block are provided with mounting seats, and each mounting seat is provided with a wear-resistant component.

[0018] Preferably, the first connecting block is connected to the fixed shaft via a first support arm and a first connecting pin, and the second connecting block is connected to the fixed shaft via a second support arm and a second connecting pin.

[0019] Preferably, the outer periphery of the yoke is further provided with a first protective cover and a second protective cover, which are respectively located on both sides of the probe.

[0020] Preferably, an elastic element is provided between two adjacent yokes.

[0021] Preferably, the fixed shaft is provided with a soft protective plate.

[0022] A detection device includes a magnetic circuit structure for a pipeline magnetic flux leakage detector, wherein the magnetic circuit structure for the pipeline magnetic flux leakage detector is any one of the above-mentioned magnetic circuit structures for a pipeline magnetic flux leakage detector.

[0023] This utility model provides a magnetic circuit structure for a pipeline leakage magnetic flux detector. A yoke parallel to a fixed shaft is mounted on it. A first magnet, an intermediate magnet, and a second magnet are sequentially arranged around the outer periphery of the yoke. The distance between the intermediate magnet and the yoke is less than the distance between the first magnet and the yoke. Therefore, magnetic induction lines originate from the N pole of the first magnet and return to the S pole of the second magnet. When the magnetic induction lines originate from the N pole of the first magnet, they can be conducted along the pipe wall. When the magnetic induction lines originate from the N pole of the second magnet, they are divided into four parts flowing towards the S pole of the first magnet. The first part consists of… The magnetic field lines are conducted from the yoke to the S pole of the first magnet and then back to the N pole of the first magnet. The second part is conducted from the intermediate magnet to the S pole of the first magnet and then back to the N pole of the first magnet. The third part of the magnetic field lines pass through the air and flow into the fixed shaft, then are transmitted back into the air from the fixed shaft, and finally conducted to the S pole of the first magnet and then back to the N pole of the first magnet. The fourth part is conducted directly from the air to the S pole of the first magnet and then back to the N pole of the first magnet. Therefore, the magnetic circuit channels are increased, and they work together to magnetize the tube wall, so that the tube wall can be effectively magnetized and the accuracy of the detection results can be improved. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a partial structural schematic diagram of the magnetic circuit structure of the pipeline leakage magnetic field detector provided by this utility model.

[0026] Figure 2 This is a schematic diagram of the magnetic circuit structure of the pipeline leakage magnetic field detector provided by this utility model.

[0027] Figure 3 This is a cross-sectional view of the magnetic circuit structure of the pipeline leakage magnetic field detector provided by this utility model.

[0028] Figure 4 This is a schematic diagram of the structure of the yoke provided by this utility model.

[0029] Figure label:

[0030] 1-Fixed shaft; 2-Yoke; 3-First magnet; 4-Second magnet; 5-Intermediate magnet; 6-Probe wire groove; 7-Probe; 8-First connecting block; 9-Second connecting block; 10-Wear-resistant component; 11-First support arm; 12-First connecting pin; 13-Second support arm; 14-Second connecting pin; 15-First protective cover; 16-Second protective cover; 17-Elastic element; 18-Soft protective plate; 19-Wear-resistant nail. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] The core of this invention is to provide a magnetic circuit structure for a pipeline magnetic flux leakage detector. This structure can effectively magnetize the inner wall of the pipeline by increasing the magnetic circuit channels, thereby improving the accuracy of the detection results.

[0033] Another core aspect of this invention is to provide a detection device that includes the magnetic circuit structure of the above-mentioned pipeline leakage magnetic field detector.

[0034] It should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", and "rear" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of this application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] The magnetic circuit structure of a pipeline leakage magnetic field detector provided in this application includes: a fixed shaft 1, a yoke 2, a first magnet 3, a second magnet 4, and an intermediate magnet 5;

[0036] Among them, the fixed shaft 1 is used to be inserted into the pipe;

[0037] The yoke 2 is connected to the fixed shaft 1 and the two are parallel to each other;

[0038] The first magnet 3 is disposed at the first end of the outer periphery of the yoke 2, and the N pole and S pole of the first magnet 3 are arranged radially along the fixed shaft 1.

[0039] The second magnet 4 is located at the second end of the outer periphery of the yoke 2. The distance between the first magnet 3, the second magnet 4 and the fixed shaft 1 is the same. The S pole and N pole of the second magnet 4 are arranged radially along the fixed shaft 1, and the N pole of the first magnet 3 and the N pole of the second magnet 4 are arranged in opposite directions.

[0040] The intermediate magnet 5 is located on the outer periphery of the yoke 2 and between the first magnet 3 and the second magnet 4. The distance between the intermediate magnet 5 and the fixed shaft 1 is less than the distance between the first magnet 3 and the fixed shaft 1. The N pole of the intermediate magnet 5 abuts against the S pole of the first magnet 3 or the second magnet, and the S pole abuts against the N pole of the first magnet or the second magnet 4.

[0041] For details, please refer to the appendix. Figure 1 The fixed shaft 1 serves as the base and needs to be inserted into the pipe for internal magnetic flux leakage detection. This application uses a horizontal pipe as an example. The fixed shaft 1 should be horizontally positioned, and the yoke 2 is parallel to the fixed shaft 1. Around the outer periphery of the yoke 2, from left to right, are arranged a first magnet 3, a middle magnet 5, and a second magnet 4. The N pole of the first magnet 3 is above the S pole, and the S pole of the second magnet 4 is above the N pole. The N pole of the middle magnet 5 is on the left, and the S pole is on the right. Furthermore, the distance between the middle magnet 5 and the fixed shaft 1 is less than the distance between the first magnet 3 and the fixed shaft 1. The magnetic induction lines released by the N pole of the first magnet 3 are conducted along the inner wall of the pipe, returning to the S pole of the second magnet 4, and from the N pole of the second magnet 4... The magnetic field lines emitted by the pole are divided into four parts and flow to the S pole of the first magnet 3. The first part is conducted to the S pole of the first magnet 3 by the yoke 2. The second part is conducted to the S pole of the first magnet 3 by the intermediate magnet 5. The third part of the magnetic field lines pass through the air and are conducted to the left through the fixed shaft 1, and then enter the S pole of the first magnet 3 through the air. The fourth part is directly conducted to the S pole of the first magnet 3 through the surrounding air. In fact, since the fourth part is relatively large, there are very few magnetic field lines, which can be ignored. That is to say, the structure of this application, through the setting of three main circuits and one auxiliary circuit, can increase the magnetic circuit channels and work together to achieve effective magnetization of the inner wall of the pipe, thereby improving the accuracy of the detection results.

[0042] It should be noted that the above is only an appendix. Figure 1 The first arrangement of the N and S poles of the first magnet 3 and the second magnet 4 in this application corresponds to the first arrangement where the N pole of the first magnet 3 is set upwards and the S pole is set downwards, and the N pole of the second magnet 4 is set downwards and the S pole is set upwards. However, in this application, the N pole of the first magnet 3 can also be set at the bottom and the S pole at the top. Correspondingly, the N pole of the second magnet 4 needs to be set at the top and the S pole can be set at the bottom. The N pole of the middle magnet 5 is set on the right and the S pole is set on the left. This arrangement can achieve the same technical means as the aforementioned arrangement and both fall within the protection scope of this application.

[0043] Based on the above embodiment, it also includes a probe groove 6 and a probe 7. The probe groove 6 is located on the outer periphery of the yoke 2 and extends along the length direction of the yoke 2. The probe 7 is located inside the probe groove 6.

[0044] For details, please refer to the appendix. Figure 4 The outer circumferential surface of the yoke 2 is provided with a probe groove 6. The probe groove is a strip-shaped groove and its extension direction is parallel to the length direction of the yoke 2. A probe 7 is provided in the probe groove 6, and its connecting line is led out from the probe groove 6, which can detect the inner wall of the pipe.

[0045] In some embodiments, the two ends of the yoke 2 are respectively provided with a first connecting block 8 and a second connecting block 9, both of which are non-magnetic components.

[0046] Specifically, the yoke 2 is made of a high magnetic permeability material. The bottom of both ends of the yoke 2 is an inverted trapezoidal structure. The two sides of the yoke 2 are respectively provided with a first connecting block 8 and a second connecting block 9. The first connecting block 8 and the second connecting block 9 are both non-magnetic components. The first connecting block 8, the second connecting block 9 and the yoke 2 are connected by a combination of welding and bolting to ensure structural strength and structural stability. Depending on the application scenario, they can also be welded or bolted separately.

[0047] Based on the above embodiment, the yoke 2 is provided with a number of yokes and is evenly distributed on the outer periphery of the fixed shaft 1. Each yoke 2 has a first magnet 3, a second magnet 4 and an intermediate magnet 5 on its surface.

[0048] For details, please refer to the appendix. Figure 2 Since the structure of this application is used for pipeline inspection, it is necessary to provide several yokes 2 on the outer periphery of the fixed shaft 1, and the several yokes 2 can cover the fixed shaft 1. Correspondingly, each yoke 2 has the same structure, thereby realizing the inspection of the entire inner wall of the pipeline.

[0049] In some embodiments, both the first connecting block 8 and the second connecting block 9 are provided with mounting seats, and each mounting seat is provided with a wear-resistant component 10.

[0050] For details, please refer to the appendix. Figure 3 With appendix Figure 4 Both the first connecting block 8 and the second connecting block 9 have mounting seats at their ends. Wear-resistant components 10 are mounted on the mounting seats. The two wear-resistant components 10 work together to contact the inner wall of the pipe, as shown in the attached diagram. Figure 1 In this application, the wear-resistant component 10 is selected as a roller, which reduces friction by replacing sliding friction with rolling friction. In addition, the wear-resistant component 10 can be a sheet or block or other structure that can protect the overall structure.

[0051] In some embodiments, the first connecting block 8 is connected to the fixed shaft 1 via the first support arm 11 and the first connecting pin 12, and the second connecting block 9 is connected to the fixed shaft 1 via the second support arm 13 and the second connecting pin 14.

[0052] For details, please refer to the appendix. Figure 1The first connecting block 8 is rotatably connected to the first support arm 11 via the first connecting pin 12, and the second connecting block 9 is rotatably connected to the second support arm 13 via the second connecting pin 14. It should be noted that the surface of the fixed shaft 1 is provided with a rotating connecting seat corresponding to the first support arm 11 and the second support arm 13. The first support arm 11 is rotatably connected to the rotating connecting seat via the first connecting pin 12, and the second support arm 13 is rotatably connected to the rotating connecting seat via the second connecting pin 14, so as to realize the position adjustment between the yoke 2 and the fixed shaft 1.

[0053] In some embodiments, the outer periphery of the yoke 2 is further provided with a first protective cover 15 and a second protective cover 16, which are respectively provided on both sides of the probe 7.

[0054] Specifically, a first protective cover 15 and a second protective cover 16 are installed on the outer periphery of the yoke 2 via wear-resistant nails 19. The first protective cover 15 and the second protective cover 16 are respectively located on both sides of the probe 7 to protect the first magnet 3 and the second magnet 4 and increase wear resistance.

[0055] In some embodiments, an elastic element 17 is provided between two adjacent yokes 2.

[0056] For details, please refer to the appendix. Figure 1 With appendix Figure 2 The side of the yoke 2 is provided with a groove, and an elastic element 17 is provided between two adjacent yokes 2. The elastic element 17 is generally a spring. The two ends of the spring are inserted into the groove and abut against the bottom of the groove. When the spring applies force to the two yokes 2, it can increase the distance between the two yokes 2 and increase the distance between the yoke 2 and the fixed shaft 1. When the inner diameter of the pipe is small, it is necessary to reduce the distance between the yoke 2 and the fixed shaft 1. The elastic element 17 can play a buffering role. After being removed from the pipe, the distance between the yokes 2 can still be restored through the elastic element 17.

[0057] Based on the above embodiment, a soft protection plate 18 is provided on the fixed shaft 1.

[0058] For details, please refer to the appendix. Figure 2 A soft protective plate 18 is provided on the left side of the fixed shaft 1. The soft protective plate 18 can buffer and dampen shock, protect the detector body, reduce friction and wear, extend service life, maintain the stability of the magnetization gap, provide sealing protection, prevent impurities from entering, and assist in guidance and optimize passability.

[0059] In addition to the magnetic circuit structure of the pipeline magnetic flux leakage detector described above, this utility model also provides a detection device that includes the magnetic circuit structure of the pipeline magnetic flux leakage detector disclosed in the above embodiments. For the structure of other parts of the detection device, please refer to the prior art, which will not be repeated here.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] The magnetic circuit structure and detection device of the pipeline magnetic flux leakage detector provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A magnetic circuit structure for a pipeline leakage magnetic flux detector, characterized in that, include: Fixed shaft (1) is used for insertion into the pipe; The yoke (2) is connected to the fixed shaft (1) and the two are parallel to each other; A first magnet (3) is disposed at the first end of the outer periphery of the yoke (2), and the N pole and S pole of the first magnet (3) are arranged radially along the fixed axis (1); The second magnet (4) is located at the second end of the outer periphery of the yoke (2). The distance between the first magnet (3), the second magnet (4) and the fixed shaft (1) is the same. The S pole and N pole of the second magnet (4) are arranged radially along the fixed shaft (1), and the N pole of the first magnet (3) and the N pole of the second magnet (4) are arranged in opposite directions. An intermediate magnet (5) is disposed on the outer periphery of the yoke (2) and located between the first magnet (3) and the second magnet (4). The distance between the intermediate magnet (5) and the fixed shaft (1) is less than the distance between the first magnet (3) and the fixed shaft (1). The N pole of the intermediate magnet (5) abuts against the S pole of the first magnet (3) or the second magnet (4), and the S pole abuts against the N pole of the first magnet (3) or the second magnet (4).

2. The magnetic circuit structure of the pipeline leakage magnetic flux detector according to claim 1, characterized in that, It also includes a probe groove (6) and a probe (7). The probe groove (6) is located on the outer periphery of the yoke (2) and extends along the length of the yoke (2). The probe (7) is located inside the probe groove (6).

3. The magnetic circuit structure of the pipeline leakage magnetic flux detector according to claim 1, characterized in that, The yoke (2) has a first connecting block (8) and a second connecting block (9) at its two ends, and both the first connecting block (8) and the second connecting block (9) are non-magnetic components.

4. The magnetic circuit structure of the pipeline leakage magnetic flux detector according to claim 3, characterized in that, The yoke (2) has several parts and is evenly distributed on the outer periphery of the fixed shaft (1). Each yoke (2) has a first magnet (3), a second magnet (4) and an intermediate magnet (5) on its surface.

5. The magnetic circuit structure of the pipeline leakage magnetic flux detector according to claim 3, characterized in that, Both the first connecting block (8) and the second connecting block (9) are provided with mounting seats, and each mounting seat is provided with a wear-resistant component (10).

6. The magnetic circuit structure of the pipeline leakage magnetic flux detector according to claim 3, characterized in that, The first connecting block (8) is connected to the fixed shaft (1) via the first support arm (11) and the first connecting pin (12), and the second connecting block (9) is connected to the fixed shaft (1) via the second support arm (13) and the second connecting pin (14).

7. The magnetic circuit structure of the pipeline leakage magnetic flux detector according to claim 2, characterized in that, The outer periphery of the yoke (2) is also provided with a first protective cover (15) and a second protective cover (16), which are respectively located on both sides of the probe (7).

8. The magnetic circuit structure of the pipeline leakage magnetic flux detector according to claim 4, characterized in that, An elastic element (17) is provided between two adjacent yokes (2).

9. The magnetic circuit structure of the pipeline leakage magnetic flux detector according to any one of claims 1 to 8, characterized in that, A soft protective plate (18) is provided on the fixed shaft (1).

10. A detection device, comprising a magnetic circuit structure for a pipeline leakage magnetic flux detector, characterized in that, The magnetic circuit structure of the pipeline magnetic flux leakage detector is the magnetic circuit structure of the pipeline magnetic flux leakage detector as described in any one of claims 1 to 9.

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