Metal particle capturing device with magnetic attraction function
By using a rare earth permanent magnet layer in the metal particle capture device to adsorb the metal particles generated inside the GIS bus shell, the problem of low capture efficiency in the prior art is solved, and a more efficient particle capture effect is achieved.
Patent Information
- Application Number
- CN202421463656.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-25
AI Technical Summary
The existing metal particle capture device relies on the self-weight of particles to capture free fall, resulting in the movement trajectory of the particles changing under the action of air flow changes and electric field inside the busbar, and the capture efficiency is low.
A metal particle capture device with magnetic absorption function is designed to use rare earth permanent magnet layers (such as neodymium iron boron magnet layers) to adsorb metal particles generated in the inner cavity of the GIS busbar shell to prevent the particles from moving under force in the electric field.
The magnetic absorption function significantly improves the capture efficiency of metal particles, prevents the particles from causing harm to the insulating parts, and significantly improves the capture effect compared with the prior art.
Smart Images
Figure CN222868494U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a metal particle capturing device with a magnetic suction function, belonging to the technical field of GIS. Background Art
[0002] During the operation of GIS, the busbar temperature changes dramatically and frequently under the dual influence of daily ambient temperature changes and conductor current-carrying heat. The electric force between the three-phase busbars will also cause the busbar to shake, resulting in friction between the bolts and screw holes to produce metal particles. Metal particles are extremely harmful to the GIS busbar, so a particle capture device needs to be installed.
[0003] Conventional metal particle capture devices install a mesh structure on the shell surface, and the metal particles fall freely under their own gravity to achieve capture. However, the metal particles themselves are small in size and light in weight. Under the dual effects of air flow changes and electric fields inside the busbar, their movement trajectory may change, so the capture operation by free fall will result in low capture efficiency. Utility Model Content
[0004] The utility model provides a metal particle capturing device with a magnetic attraction function, which solves the problem that the current metal particle capturing devices mainly rely on the free fall of metal particles due to their own weight to complete the capturing operation. Since the metal particles themselves are relatively light in weight, their movement trajectories will be changed under the dual effects of the airflow changes and the electric field inside the busbar, so that the capturing operation through free fall will lead to low capturing efficiency.
[0005] The technical problem to be solved by the utility model is achieved by adopting the following technical solutions:
[0006] A metal particle capturing device with a magnetic suction function is used for magnetically capturing metal particles in an internal cavity of a GIS busbar shell. The GIS busbar shell is provided with a screw hole, a first bolt is screwed on the screw hole, and is used for installing a busbar conductor, and the internal cavity is set as an air chamber, an interface on the GIS busbar shell is connected to an aluminum alloy flange, the air chamber, the interior of the interface, and the interior of the aluminum alloy flange are all connected, a plug assembly is installed on the aluminum alloy flange, a rare earth permanent magnet layer is arranged in the middle of the plug assembly, and is used for absorbing metal particles generated between the first bolt and the screw hole when the GIS is running, and one side of the rare earth permanent magnet layer faces the inner side of the aluminum alloy flange.
[0007] Preferably, the plug assembly includes an insulating plate and a metal pressure plate, the top of the insulating plate is mounted on an aluminum alloy flange, the rare earth permanent magnet layer is arranged on the insulating plate, and the inner bottom of the aluminum alloy flange corresponds to the rare earth permanent magnet layer, and the metal pressure plate is mounted on the insulating plate.
[0008] Preferably, the aluminum alloy flange is connected to the interface on the GIS busbar housing via bolts, and the metal pressure plate and the insulating plate are both connected to the aluminum alloy flange via bolts.
[0009] Preferably, the internal channel size of the interface and the channel size on the aluminum alloy flange decrease in sequence.
[0010] Preferably, the thickness of the rare earth permanent magnet layer is 30-40 mm.
[0011] The above scheme is adopted in order to enable the suction force generated by the rare earth permanent magnet layer to resist the air flow changes and electric field force inside the busbar.
[0012] Preferably, the rare earth permanent magnet layer is a neodymium iron boron magnet layer.
[0013] The beneficial effects of the utility model are as follows: the utility model uses a rare earth permanent magnet layer (such as a neodymium iron boron magnet layer) as a particle capture device, which can adsorb metal particles (mainly iron, stainless steel, etc.) generated by friction between the first bolt and the screw hole fastening part during GIS operation, and prevent the metal particles from being forced to move to the high-voltage conductor, the surface of the insulating part, etc. in the electric field to cause damage to the insulation; compared with the prior art that relies on the free fall of the metal particles due to their own weight to complete the capture operation, the capture efficiency is improved and the capture effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a cross-sectional view from top to bottom of the utility model;
[0015] Figure 2 for Figure 1 The structural diagram of part A in the figure;
[0016] Figure 3 It is a schematic diagram of the positions of the aluminum alloy flange, the NdFeB magnet layer, the insulating plate and the metal pressing plate in the utility model;
[0017] In the figure: GIS busbar housing 1; internal cavity 2; aluminum alloy flange 3; insulating plate 4; interface 5; NdFeB magnet layer 6; metal pressure plate 7; first bolt 8; busbar conductor 9. DETAILED DESCRIPTION
[0018] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific illustrations.
[0019] In the GIS used in the present invention, the busbar conductor 9 inside the GIS busbar housing 1 is mainly installed on the GIS busbar housing 1 by the first bolt 8. When the GIS is in operation, the first bolt 8 will expand and contract with respect to the screw hole, rotate axially or radially, and move up and down. Therefore, the first bolt 8 will rub against the screw hole on the GIS busbar housing, thereby generating metal particles. The above situation is a common phenomenon in the art, so it is not explained in detail in this article. This scheme realizes the capture of metal particles according to the following device:
[0020] like Figure 1-3 As shown, a metal particle capturing device with magnetic suction function is used to magnetically capture metal particles in the internal cavity 2 of the GIS busbar housing 1. The GIS busbar housing 1 is provided with a screw hole, and the screw hole is screwed with a first bolt 8 for installing a busbar conductor 9. The internal cavity 2 is set as an air chamber, and the interface 5 on the GIS busbar housing 1 is connected by bolts ( Figure 2 Not shown, Figure 3 The air chamber, the interior of the interface 5, and the interior of the aluminum alloy flange 3 are all connected, and the size of the internal channel of the interface 5 and the channel size on the aluminum alloy flange 3 are reduced in sequence; the aluminum alloy flange 3 is connected by bolts ( Figure 2 Not shown, Figure 3 As shown, the insulating plate 4 and the metal pressing plate 7 are connected together, and a 30-40 mm thick NdFeB magnet layer 6 is set in the middle of the insulating plate 4 to absorb metal particles generated between the first bolt 8 and the screw hole during the operation of the GIS, and one side of the NdFeB magnet layer 6 faces the inner side of the aluminum alloy flange 3.
[0021] When the device is in operation, that is, the GIS is in operation, the busbar temperature changes violently and frequently under the dual influence of daily ambient temperature changes and conductor current, and the electric force between the three-phase busbars will also cause the busbar to shake, resulting in friction between the first bolt 8 and the screw hole fastening part during GIS operation to generate metal particles (the existing GIS will encounter the above problem during operation, so the above structure and principle belong to the prior art and are not described in detail here). Due to the adsorption of the NbFeB magnet layer 6, the metal particles pass through the internal cavity 2, the inside of the interface 5, and the inside of the aluminum alloy flange 3 in turn to reach the surface of the NbFeB magnet layer 6; after a certain period of time, the bolts installed on the aluminum alloy flange 3 can be removed to remove the insulating plate 4 and the metal pressure plate 7 from the aluminum alloy flange 3, and then the metal particles on the NbFeB magnet layer 6 can be removed by methods such as but not limited to cleaning, or a new NbFeB magnet layer 6 can be directly replaced (it should be introduced here that the NbFeB magnet layer 6 and the insulating plate 4 are connected by a detachable connection method not limited to bolt connection).
[0022] The utility model uses a rare earth permanent magnet layer (for example, a neodymium iron boron magnet layer 6) as a particle capture device, which can absorb metal particles (mainly iron, stainless steel, etc.) generated by friction between the first bolt 8 and the screw hole fastening part during GIS operation, and prevent the metal particles from being forced to move to the high-voltage conductor, the surface of the insulating part, etc. in the electric field to cause damage to the insulation; compared with the prior art that relies on the free fall of the metal particles due to their own weight to complete the capture operation, the capture efficiency is improved and the capture effect is improved.
[0023] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A metal particle capturing device with magnetic suction function, used for magnetically capturing metal particles in the internal cavity of a GIS busbar housing, wherein the GIS busbar housing is provided with a screw hole, a first bolt is screwed on the screw hole, and the busbar conductor is installed, and the internal cavity is set as an air chamber, characterized in that: The interface on the GIS busbar housing is connected to an aluminum alloy flange, and the air chamber, the interior of the interface, and the interior of the aluminum alloy flange are all connected. The aluminum alloy flange is installed with a plug assembly, and a rare earth permanent magnet layer is arranged in the middle of the plug assembly to absorb metal particles generated between the first bolt and the screw hole when the GIS is running, and one side of the rare earth permanent magnet layer faces the inside of the aluminum alloy flange.
2. The metal particle capturing device with magnetic attraction function according to claim 1, characterized in that: The plug assembly includes an insulating plate and a metal pressure plate. The top of the insulating plate is installed on the aluminum alloy flange. The rare earth permanent magnet layer is arranged on the insulating plate. The inner bottom of the aluminum alloy flange corresponds to the rare earth permanent magnet layer. The metal pressure plate is installed on the insulating plate.
3. The metal particle capturing device with magnetic attraction function according to claim 2, characterized in that: The aluminum alloy flange is connected to the interface on the GIS busbar housing through bolts, and the metal pressure plate and the insulating plate are both connected to the aluminum alloy flange through bolts.
4. The metal particle capturing device with magnetic attraction function according to claim 1, characterized in that: The internal channel size of the interface and the channel size on the aluminum alloy flange decrease in sequence.
5. The metal particle capturing device with magnetic attraction function according to claim 1, characterized in that: The thickness of the rare earth permanent magnet layer is 30-40 mm.