A filter suitable for use in a harmonic processing of a submerged arc furnace

Abstract

The utility model discloses a filter suitable for mineral heat furnace harmonic processing relates to mineral heat furnace harmonic processing technical field, this filter suitable for mineral heat furnace harmonic processing, including by the main cabinet body of electrically conductive metal sheet material welding, the main cabinet body inner wall surface is sprayed with conductive coating, and the thickness of conductive coating is 50~100mu m, and the front side of main cabinet body is equipped with the metal door panel that can open and shut, and the edge of metal door panel is equipped with annular conductive spring piece, and when metal door panel closes, and the continuous conductive shielding layer is formed to main cabinet body lateral wall pressure joint, and the inside of main cabinet body is equipped with metal vertical baffle through bolt, and metal vertical baffle divides main cabinet body into high -voltage area and low -voltage area, and the bottom of main cabinet body is equipped with grounding bolt, is used for connecting external grounding grid. The utility model discloses through multilevel shielding design, including conductive cabinet, coating, spring piece, flanging, baffle sleeve and shielding sub -box, effectively blocks the interference and keeps shielding continuity, and the overall anti -interference ability has been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of harmonic processing technology for electric arc furnaces, and in particular to a filter suitable for harmonic processing of electric arc furnaces. Background Technology

[0002] In heavy industrial production environments such as electric arc furnaces, the widespread use of high-power nonlinear loads leads to severe harmonic pollution in the power grid, threatening power quality and equipment operational safety. Therefore, active power filters, as key harmonic mitigation devices, are widely used in such applications.

[0003] However, the complex electromagnetic environment places extremely high demands on the anti-interference capability of the filter itself. Existing filter cabinets have shortcomings in electromagnetic shielding design. For example, electromagnetic leakage paths can easily form at cabinet joints, door gaps, and wiring holes. High-voltage and low-voltage lines are often mixed in the wiring, resulting in serious signal interference and affecting the stable operation of the control system. At the same time, there is a lack of effective shielding continuity measures at the external cable access points, which weakens the overall shielding effectiveness. Utility Model Content

[0004] This utility model provides a filter suitable for harmonic processing of electric arc furnaces, including a main cabinet welded from conductive metal plates. The inner wall surface of the main cabinet is coated with a conductive coating with a thickness of 50-100μm. The front of the main cabinet is provided with an openable metal door panel. The edge of the metal door panel is provided with annular conductive springs. When the metal door panel is closed, the conductive springs are pressed against the side wall of the main cabinet to form a continuous conductive shielding layer. Metal vertical partitions are installed inside the main cabinet by bolts, which divide the main cabinet into a high-voltage zone and a low-voltage zone. Grounding bolts are provided at the bottom of the main cabinet for connecting to an external grounding grid.

[0005] Preferably, the main cabinet has a shielded sub-box for installing the control circuit board inside. The shielded sub-box is a fully enclosed metal box, which is fixed to the upper part of the low-voltage area of ​​the main cabinet by an insulating bracket. The surface of the shielded sub-box has multiple heat dissipation holes, and a metal mesh shielding layer is embedded in the holes.

[0006] Preferably, a wave-shaped electromagnetic sealing strip is provided between the cover plate of the shielded sub-box and the box body to achieve continuous electrical contact in the closed state and prevent electromagnetic leakage.

[0007] Preferably, the metal vertical partition plate has a wire-passing hole, and an insulating wire-passing sleeve with a metal flange is embedded in the wire-passing hole. The insulating wire-passing sleeve is welded and fixed to the metal vertical partition plate to maintain the continuity of shielding.

[0008] Preferably, the low-voltage area of ​​the main cabinet is provided with a cable layered routing rack, with a signal cable trough on the upper layer and a power cable trough on the lower layer, and shielded cables are laid in the signal cable trough.

[0009] Preferably, the signal cable trough and the power cable trough are separated by a metal partition.

[0010] Preferably, the top of the main cabinet is provided with a detachable shielding cover plate, and the edge of the shielding cover plate is provided with a downward folded conductive flange. The conductive flange is pressed tightly with the top of the main cabinet by multiple screws to form a top electromagnetic shielding structure.

[0011] Preferably, the side wall of the main cabinet has a perforation, and a fixing plate is installed on the outside of the perforation by bolts, and a flexible shielded corrugated pipe is snapped into the fixing plate.

[0012] Preferably, a slot is provided on one side of the fixed plate, and a retaining ring is provided on one side of the corrugated pipe. The retaining ring engages with the slot, and a fixing bolt is provided on the fixed plate. The fixing bolt is threadedly connected to the threaded hole on the retaining ring.

[0013] Preferably, the other side of the bellows is symmetrically threaded with a screw, and one end of the screw is rotatably connected to a positioning arc sleeve.

[0014] This utility model provides a filter suitable for harmonic processing in submerged arc furnaces, which, compared with the prior art:

[0015] 1. This utility model forms a complete electromagnetic shielding structure through the design of conductive metal cabinet, conductive coating on inner wall, conductive spring sheet on door panel and conductive flange on top, which effectively blocks external interference. The internal metal vertical partition is set to separate high and low voltage areas. The wiring hole adopts insulating sleeve with metal flange to maintain shielding continuity. The shielding sub-box is combined with wave sealing strip and metal mesh heat dissipation hole to take into account heat dissipation and electromagnetic protection, and the overall anti-interference ability is significantly improved.

[0016] 2. This utility model arranges signal and power cables in layers using a cable tray with metal partitions in the middle to reduce mutual interference. External cables are connected to the side walls through fixing plates, snap rings, and flexible shielded corrugated pipes. It is easy to install and maintains the shielding effect. All components are reliably grounded, the structure is compact, and it is easy to maintain. It is suitable for harmonic control applications in strong interference environments such as electric arc furnaces. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the main cabinet in an embodiment of this utility model;

[0020] Figure 3 This is an embodiment of the present utility model. Figure 2 Top view of the structure;

[0021] Figure 4 This is an embodiment of the present utility model. Figure 3 Schematic diagram along section AA;

[0022] Figure 5 This is a schematic diagram showing the disassembled structure of the shielding cover plate according to an embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of the metal vertical partition structure according to an embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram showing the disassembled structure of the fixed disc and corrugated pipe in an embodiment of this utility model;

[0025] Figure 8 This is a schematic diagram of the retaining ring and other structures in an embodiment of the present utility model.

[0026] Figure label:

[0027] 1. Main cabinet; 2. Metal door panel; 3. Conductive spring; 4. Grounding bolt; 5. Shielding cover plate; 6. Conductive flange; 7. Metal vertical partition; 8. Insulating bracket; 9. Shielding sub-box; 10. Metal mesh shielding layer; 11. Cable layered routing frame; 12. Signal cable trough; 13. Metal horizontal partition; 14. Power cable trough; 15. Insulating conduit sleeve; 16. Fixing plate; 17. Card slot; 18. Fixing bolt; 19. Corrugated pipe; 20. Snap ring; 21. Screw; 22. Positioning arc sleeve; 23. Waveform electromagnetic sealing strip. Detailed Implementation

[0028] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] Please refer to Figures 1-8 This utility model provides a filter suitable for harmonic processing of electric arc furnaces, including a main cabinet 1 welded from conductive metal plates. The main cabinet 1 is welded from conductive metal plates, and the inner wall surface is sprayed with a conductive coating with a thickness of 50-100μm to enhance the overall electromagnetic shielding effectiveness.

[0030] The front of the main cabinet 1 is equipped with an openable metal door panel 2. The edge of the metal door panel 2 is equipped with an annular conductive spring piece 3 to ensure that it is tightly pressed against the side wall of the main cabinet 1 when closed, forming a continuous conductive shielding layer.

[0031] In addition, the top of the main cabinet 1 is equipped with a removable shielding cover 5, and the conductive flange 6 with its edge folded down is pressed tightly with the top of the main cabinet 1 by multiple screws, further enhancing the electromagnetic shielding effect at the top.

[0032] The main cabinet 1 is equipped with a metal vertical partition 7 installed inside by bolts, which divides the cabinet space into a high-voltage area and a low-voltage area to reduce electromagnetic interference between cables of different voltage levels. The metal vertical partition 7 has a wire-passing hole and is fitted with an insulating wire-passing sleeve 15 with a metal flange to ensure that the shielding continuity is maintained when the cable passes through.

[0033] like Figure 2 As shown, the main cabinet 1 has a shielded sub-box 9 for installing control circuit boards inside. The shielded sub-box 9 is a fully enclosed metal box, which is fixed to the upper part of the low-voltage area by an insulating bracket 8. The surface of the shielded sub-box 9 has multiple heat dissipation holes, and the holes are embedded with a metal mesh shielding layer 10, which takes into account both heat dissipation and electromagnetic protection. A waveform electromagnetic sealing strip 23 is provided between the cover plate of the shielded sub-box 9 and the box body to ensure continuous electrical contact in the closed state and prevent electromagnetic leakage.

[0034] The main cabinet 1 has a cable layered wiring rack 11 in the low-voltage area, including an upper signal cable tray 12 and a lower power cable tray 14. Shielded cables are laid in the signal cable tray 12. The two trays are isolated by a metal partition 13 to avoid mutual interference between different types of cables. This layered wiring design effectively improves the electromagnetic compatibility of the system.

[0035] The bottom of the main cabinet 1 is equipped with a grounding bolt 4, which is used to connect to the external grounding grid to ensure that the entire system has a low-impedance grounding path.

[0036] like Figure 7 and Figure 8 As shown, a fixing plate 16 is installed on the outside of the perforation on the side wall of the main cabinet 1 by bolts. A flexible shielding corrugated tube 19 is snapped into the fixing plate 16. A slot 17 is opened on one side of the fixing plate 16, and a retaining ring 20 is provided on one side of the corrugated tube 19. The two are snapped together and fastened by fixing bolts 18 to ensure that the shielding effect is maintained when the external cable is connected.

[0037] The other side of the corrugated pipe 19 is symmetrically threaded with a screw 21, and one end of the screw 21 is rotatably connected to a positioning arc sleeve 22, which facilitates the quick installation and adjustment of the cable.

[0038] In summary, the main cabinet 1 is welded from conductive metal plates, and the inner wall is sprayed with a conductive coating of 50-100μm thickness to enhance electromagnetic shielding effectiveness. The metal door panel 2 is equipped with annular conductive springs 3 on the edge to ensure tight contact with the cabinet side wall when closed, forming a continuous conductive shielding layer. The top is equipped with a removable shielding cover 5, and its conductive flange 6 is tightened with screws to enhance the top shielding effect. The interior is separated into high-voltage and low-voltage areas by metal vertical partitions 7. The wiring holes are embedded with insulating wiring sleeves 15 with metal flanges to maintain shielding continuity. The shielding sub-box 9 is fixed in the low-voltage area. The surface heat dissipation holes are embedded with a metal mesh shielding layer 10 and are equipped with a waveform electromagnetic sealing strip 23. The cable layer routing frame 11 separates the signal cable tray 12 and the power cable tray 14, and is connected to the external grounding grid through grounding bolts 4. The side wall is connected to the external cable through flexible shielded corrugated pipes 19 to ensure the overall shielding effect.

[0039] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A filter suitable for harmonic processing in submerged arc furnaces, characterized in that: The main cabinet (1) is made of conductive metal plates welded together. The inner wall surface of the main cabinet (1) is coated with a conductive coating with a thickness of 50-100μm. The front side of the main cabinet (1) is provided with an openable metal door panel (2). The edge of the metal door panel (2) is provided with an annular conductive spring piece (3). When the metal door panel (2) is closed, the conductive spring piece (3) is pressed against the side wall of the main cabinet (1) to form a continuous conductive shielding layer. The main cabinet (1) is equipped with a metal vertical partition (7) installed inside by bolts. The metal vertical partition (7) divides the main cabinet (1) into a high-voltage area and a low-voltage area. The bottom of the main cabinet (1) is provided with a grounding bolt (4) for connecting to an external grounding grid.

2. The filter for harmonic processing of submerged arc furnaces according to claim 1, characterized in that: The main cabinet (1) is equipped with a shielded sub-box (9) for installing control circuit boards. The shielded sub-box (9) is a fully enclosed metal box, which is fixed to the upper part of the low-voltage area of ​​the main cabinet (1) by an insulating bracket (8). The surface of the shielded sub-box (9) is provided with multiple heat dissipation holes, and a metal mesh shielding layer (10) is embedded in the holes.

3. The filter for harmonic processing of submerged arc furnaces according to claim 2, characterized in that: The cover plate of the shielded sub-box (9) is provided with a wave-shaped electromagnetic sealing strip (23) between the box body and the cover plate, which is used to achieve continuous electrical contact in the closed state and prevent electromagnetic leakage.

4. The filter for harmonic processing of submerged arc furnaces according to claim 3, characterized in that: The metal vertical partition (7) has a wire hole, and an insulating wire sleeve (15) with a metal flange is embedded in the wire hole. The insulating wire sleeve (15) is welded and fixed to the metal vertical partition (7) to maintain the continuity of shielding.

5. The filter for harmonic processing of submerged arc furnaces according to claim 4, characterized in that: The main cabinet (1) has a cable layered routing frame (11) inside the low-voltage area. The upper layer of the cable layered routing frame (11) has a signal cable trough (12), and the lower layer has a power cable trough (14). Shielded cables are laid in the signal cable trough (12).

6. The filter for harmonic processing of submerged arc furnaces according to claim 5, characterized in that: The signal cable trough (12) and the power cable trough (14) are separated by a metal partition (13).

7. The filter for harmonic processing of submerged arc furnaces according to claim 1, characterized in that: The main cabinet (1) is provided with a detachable shielding cover (5) at the top. The shielding cover (5) has a downward-folded conductive flange (6) at its edge. The conductive flange (6) is pressed tightly with the top of the main cabinet (1) by multiple screws to form a top electromagnetic shielding structure.

8. The filter for harmonic processing of submerged arc furnaces according to claim 7, characterized in that: The main cabinet (1) has a perforation on its side wall. A fixing plate (16) is installed on the outside of the perforation by bolts. A flexible shielded corrugated pipe (19) is snapped into the fixing plate (16).

9. The filter for harmonic processing of submerged arc furnaces according to claim 8, characterized in that: The fixed plate (16) has a slot (17) on one side and a retaining ring (20) on one side of the corrugated pipe (19). The retaining ring (20) engages with the slot (17). The fixed plate (16) is provided with a fixing bolt (18), which is threadedly connected to the threaded hole on the retaining ring (20).

10. The filter for harmonic processing of submerged arc furnaces according to claim 9, characterized in that: The other side of the bellows (19) is symmetrically threaded with a screw (21), and one end of the screw (21) is rotatably connected to a positioning arc sleeve (22).

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