Metal particle trap with additional internal magnetic field
By introducing an internal magnetic field into the metal particle trap, the Lorentz force is used to weaken the velocity of the metal particles, thus solving the problem of particle escape under DC voltage, improving the capture rate and enhancing the insulation performance.
Patent Information
- Application Number
- CN202520496826.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-20
AI Technical Summary
Under DC voltage, metal particles have significant kinetic energy in gas-insulated metal-enclosed switchgear. Existing particle traps are ineffective at capturing and suppressing the escape of metal particles under weakened electric field conditions, leading to damage to insulation performance.
An internal magnetic field is introduced into the metal particle trap. By combining a bar permanent magnet with a baffle, the vertical velocity of the metal particles is weakened by the Lorentz force, thereby improving the capture rate.
It effectively reduces the probability of metal particles escaping from the trap, improves the capture rate, enhances insulation performance, and prevents discharge and flashover failures between electrodes.
Smart Images
Figure CN223942281U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of DC gas-insulated metal-enclosed switchgear technology, and more particularly to a metal particle trap with an additional internal magnetic field. Background Technology
[0002] During the production, transportation, installation, and operation of gas-insulated metal-enclosed switchgear (GIS), metal particles are inevitably generated due to factors such as mechanical vibration, collision, or thermal expansion and contraction friction. These free metal particles, once charged, move freely within the cavity under the influence of electric field forces and gravity, potentially causing inter-electrode discharges or, in the case of small particles adhering to the insulator surface, resulting in surface flashover faults. This can severely damage the insulation performance of the power equipment. Under DC voltage, the activity of these particles is even stronger, and their range of motion is wider. Therefore, insulation faults caused by metal particles have become a significant challenge in the research and application of DC GIS.
[0003] Current research on metal particle traps mainly focuses on the structure of the traps, specifically adjusting geometric parameters such as the shape of the trap baffle, the length, and the height to increase the probability of particle capture. However, due to the large kinetic energy of particles entering the trap under DC high voltage, the "charge suppression effect" of the trap is relatively good. Even with almost no electric field force, the particles still possess sufficient kinetic energy to escape. Therefore, the "blocking effect" of the trap becomes more crucial under DC voltage. To address this, this invention proposes a metal particle trap with an additional internal magnetic field. Utility Model Content
[0004] This application provides a metal particle trap with an additional internal magnetic field, which can effectively reduce the velocity of metal particles vertically impacting the trap after entering it, thereby greatly improving the capture rate of metal particles.
[0005] In view of this, this application provides a metal particle trap with an additional internal magnetic field, comprising: a trap body;
[0006] The trap itself has a hollow structure;
[0007] The upper surface of the trap body is evenly and alternately arranged with multiple grids and multiple baffles along its length.
[0008] The grid is connected to the interior of the trap body;
[0009] A strip-shaped permanent magnet is disposed directly below each of the baffles, and the axis of symmetry of the strip-shaped permanent magnet coincides with the axis of symmetry of the baffle.
[0010] The trap body is sealed on all four sides and at the bottom.
[0011] Optionally, the number of grid cells in each column may be one or more;
[0012] When there are multiple grids in each column, the multiple grids are distributed at intervals along the width direction of the trap body.
[0013] Optionally, the width l1 of the grid is 4~20mm;
[0014] When there are multiple grid cells in each column, the spacing d4 between two adjacent grid cells in the same column is 4~15mm;
[0015] The distance d5 from both sides of each column of the grid to the edge of the trap body is 4~15mm.
[0016] Optionally, one or more of the strip permanent magnets are arranged in parallel directly below each of the baffles;
[0017] The total length of each column of the bar permanent magnets on the trap body is the same as the total length of each column of the grid.
[0018] Optionally, the width of the strip permanent magnet is less than or equal to the width l2 of the baffle;
[0019] The thickness of the strip permanent magnet is 3~20mm.
[0020] Optionally, the magnetic field direction of the bar permanent magnet is tangential to the arc surface of the trap where the bar permanent magnet is arranged and perpendicular to the two sides of the bar permanent magnet.
[0021] Optionally, the trap body is made of a non-ferromagnetic conductive metal;
[0022] The height h1 of the trap body is 9mm~30mm;
[0023] The thickness d2 of the lower surface of the trap body and the thickness d3 of the two side surfaces of the trap body are both 1~4mm;
[0024] The width l3 of the trap body is 20~45cm.
[0025] Optionally, the width l2 of the baffle is 1.5 to 4 times the width l1 of the grid;
[0026] The thickness d1 of the baffle is 5~30mm.
[0027] Optionally, the bar permanent magnet is a cuboid or a prism with trapezoidal top and bottom surfaces.
[0028] Optionally, the cross-sectional shape of the baffle is rectangular, rhomboid, trapezoidal or triangular.
[0029] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: The metal particle trap with an additional internal magnetic field includes a trap body, which is a hollow structure. Multiple grids and multiple baffles are evenly and alternately arranged on the upper surface of the trap body along the length direction. The grids are connected to the interior of the trap body. A strip permanent magnet is provided directly below each baffle, and the symmetry axis of the strip permanent magnet coincides with the symmetry axis of the baffle. The trap body is sealed around its sides and bottom, which can prevent the metal particles entering the trap from escaping. Furthermore, the strip permanent magnet below the baffle can apply a Lorentz force to the charged metal particles entering the trap, thereby weakening their vertical velocity, reducing their impact velocity on the metal particle trap, and thus reducing the probability of metal particles escaping, which greatly improves the capture rate of metal particles. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of a first structure of a metal particle trap with an added internal magnetic field in an embodiment of this application.
[0031] Figure 2 This is a cross-sectional view of a first structure of a metal particle trap with an added internal magnetic field in an embodiment of this application.
[0032] Figure 3 This is a top view of a first structure of a metal particle trap with an added internal magnetic field in an embodiment of this application;
[0033] Figure 4 This is a schematic diagram of the first arrangement of the bar permanent magnets in the embodiments of this application;
[0034] Figure 5 This is a top view of a second structure of a metal particle trap with an added internal magnetic field in an embodiment of this application;
[0035] Figure 6 This is a schematic diagram of a second arrangement of bar permanent magnets in an embodiment of this application;
[0036] Figure 7 This is a schematic diagram of the first magnetic field direction generated by the bar permanent magnet in the embodiments of this application;
[0037] Figure 8 This is a schematic diagram of the direction of the second magnetic field generated by the bar permanent magnet in the embodiments of this application.
[0038] The attached figures are labeled as follows:
[0039] 1-Trap body, 11-Grid, 12-Baffle, 13-Bar permanent magnet. Detailed Implementation
[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0042] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0043] This application provides an embodiment of a metal particle trap with an additional internal magnetic field; please refer to [link / reference needed]. Figure 1 .
[0044] The metal particle trap with an additional internal magnetic field in this embodiment includes: a trap body 1, which is a hollow structure. Multiple grids 11 and multiple baffles 12 are evenly and alternately arranged on the upper surface of the trap body 1 along the length direction. The grids 11 are connected to the interior of the trap body 1. A strip permanent magnet 13 is provided directly below each baffle 12, and the symmetry axis of the strip permanent magnet 13 coincides with the symmetry axis of the baffle 12. The trap body 1 is sealed around its perimeter and bottom.
[0045] It should be noted that the bar-shaped permanent magnet 13 below the baffle 12 can apply a Lorentz force to the charged metal particles entering the trap, thereby weakening their vertical velocity, reducing their impact velocity on the metal particle trap, and thus reducing the probability of the metal particles escaping, which greatly improves the capture rate of the metal particles.
[0046] The above is Embodiment 1 of a metal particle trap with an added internal magnetic field provided by this application. The following is Embodiment 2 of a metal particle trap with an added internal magnetic field provided by this application. Please refer to the following for details. Figures 1 to 8 .
[0047] The metal particle trap with an additional internal magnetic field in this embodiment includes: a trap body 1, which is a hollow structure. Multiple grids 11 and multiple baffles 12 are evenly and alternately arranged on the upper surface of the trap body 1 along its length. The grids 11 are connected to the interior of the trap body 1. A strip permanent magnet 13 is provided directly below each baffle 12, and the axis of symmetry of the strip permanent magnet 13 coincides with the axis of symmetry of the baffle 12. The trap body 1 is sealed on all sides and at the bottom. This closed structure at the bottom and sides can effectively suppress the escape of metal particles.
[0048] like Figure 3 and Figure 5 As shown, each column of grid 11 has one or more grids. When there are multiple grids 11 in each column, the multiple grids 11 are distributed at intervals along the width direction of the trap body 1.
[0049] like Figure 2 and Figure 3 As shown, the width l1 of the grid 11 is 4~20mm. When there are multiple grids 11 in each column, the spacing d4 between two adjacent grids 11 in the same column is 4~15mm; the distance d5 from both sides of each grid 11 to the edge of the trap body 1 is 4~15mm. Grids 11 within the above geometric parameter range can effectively increase the capture probability of metal particles and avoid the waste of resources and materials.
[0050] like Figure 4 and Figure 6 As shown, one or more bar-shaped permanent magnets 13 are arranged in parallel directly below each baffle 12. The total length of each column of bar-shaped permanent magnets 13 on the trap body 1 is the same as the total length of each column of grids 11. It can be understood that when there are multiple grids 11 in each column, multiple bar-shaped permanent magnets 13 can be arranged in parallel directly below each baffle 12. The number of bar-shaped permanent magnets 13 is equal to the number of grids 11, and they are arranged in a one-to-one correspondence.
[0051] The bar permanent magnet 13 is a cuboid or a prism with trapezoidal top and bottom surfaces. The arrangement of the bar permanent magnet 13 is adapted to the arrangement of the baffle 12. The width of the bar permanent magnet 13 is less than or equal to the width l2 of the baffle 12, and the thickness of the bar permanent magnet 13 is 3~20mm.
[0052] like Figure 7 and Figure 8As shown, the magnetic field direction of the bar permanent magnet 13 inside the metal particle trap is tangential to the arc surface of the trap where the bar permanent magnet 13 is arranged and perpendicular to the two sides of the bar permanent magnet 13. Figure 7 and Figure 8 These represent two different magnetic field vector directions generated by the interchange of the magnetic poles of the bar permanent magnet 13 along the same straight direction. After a charged metal particle enters the metal particle trap, it will be subjected to a Lorentz force perpendicular to its velocity direction due to the magnetic field. The Lorentz force can change the velocity direction of the metal particle entering the magnetic field, reducing the velocity of the metal particle perpendicular to the trap, thereby weakening the impact intensity of the metal particle on the trap, reducing the probability of the metal particle "ejecting" from the trap after collision, and thus increasing the probability of capturing the metal particle.
[0053] The trap body 1 is made of a non-ferromagnetic conductive metal, such as silver, copper, aluminum, tin, lead, titanium, and alloys of these metals. It is understandable that using a non-ferromagnetic metal allows the magnetic field generated by the permanent magnet to be distributed throughout the surrounding space, preventing most magnetic field lines from closing along the metal particle trap. This results in a stronger Lorentz force on the metal particles entering the trap. Using a highly conductive metal creates a low-field region inside the metal particle trap, significantly reducing the electric field force experienced by the falling metal particles and decreasing their probability of escape.
[0054] like Figure 2 and Figure 3 As shown, the height h1 of the trap body 1 is 9mm~30mm, the thickness d2 of the lower surface of the trap body 1 and the thickness d3 of the two side surfaces of the trap body 1 are both 1~4mm; the width l3 of the trap body 1 is 20~45cm. The relatively high height of the trap body 1 and the relatively thin thickness of the lower and side surfaces allow for a larger internal space, which facilitates the arrangement of the strip permanent magnet 13 and can form a larger low electric field region to prevent metal particles from escaping.
[0055] The cross-sectional shape of the baffle 12 can be rectangular, rhomboid, trapezoidal, or triangular. The width l2 of the baffle 12 is 1.5 to 4 times the width l1 of the grid 11, and the thickness d1 of the baffle 12 is 5 to 30 mm. It is understood that increasing the thickness of the baffle 12 can better suppress metal particles entering the metal particle trap and reduce the probability of escape. Changes in the geometry of the baffle 12 also affect the capture and escape probabilities; using inverted trapezoidal, inverted triangular, or rhomboid interfaces can improve the capture probability of metal particles and reduce their escape probability.
[0056] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A metal particle trap with an added internal magnetic field, characterized in that, include: The trap itself; The trap itself has a hollow structure; The upper surface of the trap body is evenly and alternately arranged with multiple grids and multiple baffles along its length. The grid is connected to the interior of the trap body; A strip-shaped permanent magnet is disposed directly below each of the baffles, and the axis of symmetry of the strip-shaped permanent magnet coincides with the axis of symmetry of the baffle. The trap body is sealed on all four sides and at the bottom.
2. The metal particle trap with an additional internal magnetic field according to claim 1, characterized in that, The number of grid cells in each column is one or more; When there are multiple grids in each column, the multiple grids are distributed at intervals along the width direction of the trap body.
3. The metal particle trap with an additional internal magnetic field according to claim 2, characterized in that, The width l1 of the grid is 4~20mm; When there are multiple grid cells in each column, the spacing d4 between two adjacent grid cells in the same column is 4~15mm; The distance d5 from both sides of each column of the grid to the edge of the trap body is 4~15mm.
4. The metal particle trap with an additional internal magnetic field according to claim 2, characterized in that, One or more of the strip permanent magnets are arranged in parallel directly below each of the baffles; The total length of each column of the bar permanent magnets on the trap body is the same as the total length of each column of the grid.
5. The metal particle trap with an additional internal magnetic field according to claim 1, characterized in that, The width of the bar permanent magnet is less than or equal to the width l of the baffle. 2； The thickness of the strip permanent magnet is 3~20mm.
6. The metal particle trap with an additional internal magnetic field according to claim 4, characterized in that, The magnetic field direction of the bar permanent magnet is tangential to the arc surface of the trap where the bar permanent magnet is arranged and perpendicular to the two sides of the bar permanent magnet.
7. The metal particle trap with an additional internal magnetic field according to claim 1, characterized in that, The trap body is made of a non-ferromagnetic conductive metal; The height h1 of the trap body is 9mm~30mm; The thickness d2 of the lower surface of the trap body and the thickness d3 of the two side surfaces of the trap body are both 1~4mm; The width l3 of the trap body is 20~45cm.
8. The metal particle trap with an additional internal magnetic field according to claim 1, characterized in that, The width l2 of the baffle is 1.5 to 4 times the width l1 of the grid; The thickness d1 of the baffle is 5~30mm.
9. The metal particle trap with an additional internal magnetic field according to claim 1, characterized in that, The bar permanent magnet is a cuboid or a prism with trapezoidal top and bottom surfaces.
10. The metal particle trap with an additional internal magnetic field according to claim 1, characterized in that, The cross-sectional shape of the baffle is rectangular, rhomboid, trapezoidal, or triangular.