Abstract: A pipeline demagnetization device based on a permanent magnet structure includes a central piece and permanent magnets distributed on the central piece. A magnetic field with alternating directions is formed in a wall of a pipeline in an axial direction from front to back, and strength of the magnetic field gradually decreases. The pipeline demagnetization device can be applied to the pipeline demagnetization using a built-in structure or an externally-built structure. The pipeline demagnetization device spatially constructs a set of stable alternately-decayed magnetic fields, so that the wall of the pipeline experiences the set of alternately-decayed magnetic fields when the pipeline that is magnetized spatially displaces relative to the set of alternately-decayed magnetic fields, thereby realizing demagnetization.
Type:
Grant
Filed:
November 6, 2017
Date of Patent:
April 11, 2023
Assignee:
Shanghai Jieling Magnetic Material & Devices Co., Ltd.
Inventors:
Huixin Zhang, Shiyuan Zhang, Xiaoqing Wang
Abstract: A pipeline demagnetization device based on a permanent magnet structure includes a central piece and permanent magnets distributed on the central piece. A magnetic field with alternating directions is formed in a wall of a pipeline in an axial direction from front to back, and strength of the magnetic field gradually decreases. The pipeline demagnetization device can be applied to the pipeline demagnetization using a built-in structure or an externally-built structure. The pipeline demagnetization device spatially constructs a set of stable alternately-decayed magnetic fields, so that the wall of the pipeline experiences the set of alternately-decayed magnetic fields when the pipeline that is magnetized spatially displaces relative to the set of alternately-decayed magnetic fields, thereby realizing demagnetization.
Type:
Application
Filed:
November 6, 2017
Publication date:
September 17, 2020
Applicant:
Shanghai Jieling Magnetic Material & Devices Co., Ltd.
Inventors:
Huixin ZHANG, Shiyuan ZHANG, Xiaoqing WANG