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Magnetic leakage detector out of diameter-variable pipe driven by DC generator

A technology driven by DC motors and motors, applied in pipeline systems, mechanical equipment, gas/liquid distribution and storage, etc., to achieve the effect of reducing scanning intervals, meeting process requirements, and reducing labor

Active Publication Date: 2009-02-04
NORTHEAST GASOLINEEUM UNIV
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  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the existing pipeline detection technology cannot perform safe, efficient and non-damaging online pipeline defect detection on long-distance oil and gas transmission pipelines, the present invention provides a DC motor-driven variable-diameter pipeline external magnetic flux leakage detector On the one hand, this kind of DC motor-driven variable-diameter pipeline magnetic flux leakage detector has high detection accuracy, and on the other hand, it can continuously scan and detect the corrosion defects on the inner and outer walls of the pipeline without causing any damage to the pipeline. damage, meeting the high risk of medium transported by pipelines and the process requirements of continuous production in the petroleum and petrochemical industry

Method used

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  • Magnetic leakage detector out of diameter-variable pipe driven by DC generator
  • Magnetic leakage detector out of diameter-variable pipe driven by DC generator
  • Magnetic leakage detector out of diameter-variable pipe driven by DC generator

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specific Embodiment

[0026] First determine the size parameters of the magnet, armature and pole piece. Let the width W of the permanent magnet be m ,; the distance δ between the lower surface of the pole piece and the pipe surface; the distance between two pole pieces is L m , the length of the magnet l m ;The height of the pole shoe is h t ;height h of the magnet m ;Thickness h of the armature l .

[0027] 1. Specific parameters:

[0028] ①The selected permanent magnet material is NdFeB permanent magnet, and its specific parameters are shown in Table 1:

[0029]

[0030] Table I

[0031] ②The armature material is 10 steel, and its parameters are: magnetic permeability μ=5.65×10 -3 H / m; H c =39.788~79.577A / m.

[0032] ③The air gap δ is 5mm, the medium is air, and the relevant parameters are: magnetic permeability μ 0 =4π×10 -3 H / m.

[0033] ④The magnetoresistance coefficient is Kr=1.2 according to the magnetic flux leakage detection specification.

[0034] 2. Magnet thickness cal...

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Abstract

The invention relates to a leakage magnetic detector of a reducing pipeline driven by a DC motor which mainly solves the problem that the existing pipeline detecting technology can not carry out safe, effective online pipeline defect detection with no damage to the pipeline on a long distance oil-gas conveying pipeline. The invention is characterized in that the detector includes a drive unit, a magnetization and running unit as well as a data collecting and analyzing unit; wherein, the gag bits, the permanent magnet and pole shoes of each sub-unit in the magnetization and running unit and the wall of the pipeline to be detected form a closed magnetic loop; a leakage magnetic signal generated in the loop is collected and analyzed by the data collecting and analyzing unit, thereby confirming the detect existed on the wall of the pipeline. The detector which can be driven by a motor or by a person has the characteristics of high detection precision and being capable of carrying out continuous scanning on the wall reducing of the detect without damage to the pipeline. Besides, the detector has a simple structure and a small size, has the reducing function in a certain range and can be suitable for the detection demands of the pipelines with different diameters.

Description

Technical field: [0001] The invention relates to an instrument for detecting defects of pipelines in the field of oil storage and transportation, in particular to an instrument driven by a DC motor and capable of detecting defects outside the pipelines. Background technique: [0002] Pipeline transportation is the main way of oil and natural gas transportation. Nearly 70% of crude oil and 100% of natural gas in China are transported through pipelines. Since the transmission pipeline crosses a vast area, the service environment is complex, and the location is hidden, once the failure occurs, it often causes great economic losses, leads to catastrophic accidents such as personal casualties, and destroys the ecological environment. According to statistics, 70% of my country's existing long-distance oil and gas transmission pipelines have entered the accident-prone period. Pipeline accidents caused by pipeline aging are frequent every year, and the potential danger is great. H...

Claims

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Application Information

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IPC IPC(8): F17D5/06
Inventor 戴光杨志军李伟张颖龙飞飞赵俊茹
Owner NORTHEAST GASOLINEEUM UNIV
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