Harmonic filter for power quality improvement

Abstract

The application relates to the technical field of harmonic filters, in particular to a harmonic filter for power quality improvement, which comprises a harmonic filter body, and first and second sealing connection plates are respectively fixedly connected to both ends of an outer frame cover in the harmonic filter body through bolts. Two first and second sliding outer frames which are uniformly arranged in the harmonic filter body can be slid out of the inner part of the outer frame cover after the first sealing connection plate is removed according to the needs of maintenance, installation and disassembly, an electric push rod which is uniformly arranged on the second sliding outer frame is started to control the forward movement of a connection plug which is inserted into the inner part of a butt joint connection column, no matter whether a driving control gear is arranged on a sliding driving gear plate on the first or second sliding outer frame, as long as the electric motor drives the driving control gear to rotate and operate, the first or second sliding outer frame is synchronously slid outwards.

Description

Technical Field

[0001] This invention relates to the field of harmonic filter technology, specifically a harmonic filter for improving power quality. Background Technology

[0002] In power systems, the operation of nonlinear loads (such as frequency converters, rectifiers, and electric arc furnaces) generates a large amount of harmonic current and voltage, leading to a decline in power quality, affecting the normal operation of equipment, and even causing equipment failure, shortening equipment life, and increasing power loss. Harmonic filters, as key equipment for improving power quality, can effectively suppress harmonic pollution and improve the stability and reliability of power systems. Traditional filters suffer from problems such as large size, complex installation, and difficult maintenance, making them unsuitable for the flexibility and scalability requirements of modern power systems. Harmonic filters mainly consist of functional modules and structural modules. Functional modules include: a core module containing filtering circuits (such as LC filters and active power filters, APF); a control module responsible for harmonic detection, parameter adjustment, and communication; a power supply module providing the required DC or AC power; and an interface module enabling communication with other devices (such as PLCs and monitoring systems). Structural modules are of standard size with a unified module shape (such as 19-inch rack-mount or wall-mounted types) and use standardized connectors (such as IEC connectors). The 60320 and M12 aviation connectors feature a heat dissipation design with independent heat dissipation for each module to avoid thermal coupling. However, all modules and other necessary components are concentrated inside the harmonic filter, resulting in complex wiring connections. Furthermore, inspecting or replacing internal components and modules requires disassembling the entire harmonic filter to expose all parts, making maintenance, installation, and adjustment inconvenient. Additionally, the position and angle of the harmonic filter cannot be easily adjusted after it is fixed in place. Therefore, a device is needed to solve these problems. Summary of the Invention

[0003] To address the problems in the prior art, the present invention provides a harmonic filter for improving power quality.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a harmonic filter for improving power quality, comprising a harmonic filter body, wherein a first sealing connecting plate and a second sealing connecting plate are respectively fixedly connected to both ends of the outer frame of the harmonic filter body by bolts, the first sealing connecting plate has a connecting end uniformly fixedly disposed on the side opposite to the outer frame, and a sealing protective cover is fixedly installed on both sides of the outer frame near the connecting end by bolts, and a limit support frame is fixedly installed inside the outer frame by bolts, wherein modular mounting parts are symmetrically disposed on the limit support frame.

[0005] Preferably, the front end of the outer frame is provided with mounting grooves on both sides, the mounting grooves are provided with first sliding limit slots on both sides, and the limit support frame is provided with second sliding limit slots in the middle and on both sides.

[0006] Preferably, the modular mounting part includes a sliding drive toothed plate, a limit adjustment plate, a third sliding limit groove, a fixed mounting plate, a first sliding outer frame, fixed threaded holes, fixed threaded posts, a sliding mounting bracket, mounting holes, and a second sliding outer frame. The first and second sliding outer frames are symmetrically distributed. Limit adjustment plates are provided inside both the first and second sliding outer frames. Fixed mounting plates are fixedly installed on the upper ends of both sides of the limit adjustment plates, and the fixed mounting plates are fixedly installed on the first sliding outer frame by bolts. The fixed threaded holes are evenly opened on the limit adjustment plates, and the third sliding limit groove is evenly opened on the limit adjustment plates. The two sides of the sliding mounting bracket are slidably engaged with the third sliding limit groove. The mounting holes are evenly opened through the sliding mounting bracket. The fixed threaded posts are threaded through and inserted into the two sides of the sliding mounting bracket, and the fixed threaded posts are adapted to the fixed threaded holes. The sliding drive toothed plates are symmetrically fixedly installed on the upper inner sides of the first and second sliding outer frames by bolts, and each frame has two drive toothed plates.

[0007] Preferably, a mounting support plate is fixedly installed inside the bottom end of both the first sliding outer frame and the second sliding outer frame, and a cooling fan is evenly fixedly installed on the mounting support plate, with the cooling fan located directly below the sliding mounting bracket.

[0008] Preferably, a sliding adjustment bracket is provided above the second sliding outer frame. Limiting mounting plates are fixedly installed at the bottom of both ends of the sliding adjustment bracket. Drive control gears are symmetrically rotatably installed between the limiting mounting plates. An electric adjustment push rod is provided above the sliding adjustment bracket, and the front end of the electric adjustment push rod is fixedly connected to the middle of the sliding adjustment bracket. An electric motor is fixedly installed on the limiting mounting plate located on the outer side, and the drive end of the electric motor is fixedly connected to the middle of the drive control gear.

[0009] Preferably, the inner end of the first sliding outer frame is uniformly fixedly equipped with docking connection posts, and the inner end of the second sliding outer frame is uniformly fixedly equipped with electric push rods. The front end of the electric push rod is fixedly connected with a connecting plug, and the connecting plug is adapted to the locking hole provided on the docking connection post.

[0010] Preferably, the first sliding outer frame and the second sliding outer frame are slidably engaged with the second sliding limiting slot, the two sides of the sliding adjustment bracket are slidably engaged with the inside of the first sliding limiting slot, and the electric adjustment push rod is fixedly installed inside the mounting slot.

[0011] Preferably, the two drive control gears are meshed with the sliding drive gear plate of the corresponding frame, and the sliding adjustment bracket, drive control gears and electric adjustment push rod are all located inside the sealed protective cover.

[0012] Preferably, an auxiliary support adjustment part is provided at the bottom center of the outer frame cover.

[0013] Preferably, the auxiliary support adjustment part includes threaded holes, a fixed connecting plate, a fixed mounting hole, a rotating support base, a fixed plate, and a fixed locking bolt. The fixed mounting hole is evenly distributed through the edge of the fixed plate. The middle part of the rotating support base is rotatably engaged with the middle part of the fixed plate. The fixed connecting plate is fixedly connected to the upper middle part of the rotating support base. The threaded holes are evenly distributed on the fixed connecting plate, the rotating support base, and the fixed plate. The fixed locking bolt is threaded into the rotating support base and the fixed plate. The fixed connecting plate is fixedly connected to the bottom middle part of the outer frame cover by bolts.

[0014] Preferably, the harmonic filter body is provided with a shielding protection device on its exterior. The shielding protection device includes a first rotating shield, a second rotating shield, a drive motor, a drive adjusting gear, a track support plate, a mounting platform, a first rotating adjusting gear ring, and a second rotating adjusting gear ring. The mounting platform is fixedly installed at the upper middle part of the track support plate. The bottom ends of the first rotating adjusting gear ring and the second rotating adjusting gear ring are rotatably engaged with the track support plate, and the first rotating adjusting gear ring is located outside the second rotating adjusting gear ring. The bottom end of the second rotating shield is fixedly connected to the outer edge of the second rotating adjusting gear ring, and the bottom end of the first rotating shield is fixedly connected to the inner edge of the first rotating adjusting gear ring. The drive motor is fixedly installed on the track support plate, and the two drive motors are respectively meshed with the first rotating adjusting gear ring and the second rotating adjusting gear ring.

[0015] This invention has at least the following beneficial effects:

[0016] I. The harmonic filter body of this invention features two first sliding outer frames and a second sliding outer frame, evenly distributed inside the outer frame housing. According to maintenance, installation, and disassembly requirements, the first sealing connecting plate can be removed and slid out independently from inside the outer frame housing. Activating the electric push rods evenly distributed on the second sliding outer frame controls the connecting plug to move forward and extend into the mating connecting post. At this time, regardless of whether the drive control gear is on the sliding drive tooth plate on the first or second sliding outer frame, starting the motor to drive the drive control gear will cause the first or second sliding outer frame to slide out synchronously. That is, each frame can be controlled to slide out individually, or both frames can be controlled simultaneously. The sliding mechanism allows for quick removal of components for maintenance or installation based on different repair needs, avoiding the need for complete removal due to malfunctions. Furthermore, a laser rangefinder is fixedly installed at the front end of the sliding adjustment bracket inside the mounting slot. This laser rangefinder determines the distance and position of the sliding adjustment bracket, thus indicating whether the drive control gear is located on the sliding drive gear plate on the first or second sliding outer frame. This allows for precise outward sliding control of the first and second sliding outer frames, enabling modular installation of components inside the outer frame. During maintenance, components or modules at designated locations can be moved out for maintenance or installation.

[0017] Second, even after fixed installation, the position and angle of the harmonic filter can still be easily adjusted and controlled as needed. The fixed mounting holes allow for the fixing of the mounting plate, thus fixing the auxiliary support adjustment unit as a whole. This ensures the harmonic filter body, along with the auxiliary support adjustment unit, is fixed together. When the position and angle of the harmonic filter body need adjustment and control after it is fixed, the locking bolt is adjusted and pulled out from the inside of the rotating support and the fixed plate. This allows the fixed connecting plate and the rotating support to rotate on the fixed plate to adjust and control the position and angle of the harmonic filter body. After adjustment, the locking bolt is inserted between the rotating support and the fixed plate to lock them together, thus locking the harmonic filter body in a fixed position. Furthermore, the rotating support and the fixed plate have evenly spaced threaded holes, allowing the rotating support to be fixed at any specified angle after rotation. This makes the installation and use of the harmonic filter body convenient, and allows for adjustment and fixing at any angle. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1This is a three-dimensional structural diagram of the main body from a frontal perspective in this invention;

[0020] Figure 2 This is a schematic diagram of the main body split state structure in this invention;

[0021] Figure 3 This is a schematic diagram of the auxiliary support adjustment part in the present invention;

[0022] Figure 4 This is a schematic diagram of the internal structure of the outer frame cover in this invention;

[0023] Figure 5 This is a schematic diagram of the front end structure of the outer frame cover in this invention;

[0024] Figure 6 This is a schematic diagram of the outer frame structure in this invention;

[0025] Figure 7 This is a schematic diagram of the external structure of the limiting support frame in this invention;

[0026] Figure 8 This is a schematic diagram of the modular mounting section structure in this invention;

[0027] Figure 9 This is a schematic diagram of the modular mounting section in the disassembled state in this invention;

[0028] Figure 10 This is a schematic diagram of the shielding protection device structure in this invention;

[0029] Figure 11 This is a schematic diagram of the shielding protection device in operation of the present invention;

[0030] Figure 12 This is a schematic diagram of the bottom structure of the shielding and protection device in this invention.

[0031] In the diagram: 1. Connecting end; 2. First sealing connecting plate; 3. Sealing protective cover; 4. Harmonic filter body; 5. Outer frame cover; 6. Second sealing connecting plate; 7. Auxiliary support adjustment part; 8. Threaded hole; 9. Fixed connecting plate; 10. Fixed mounting hole; 11. Rotary support base; 12. Fixed plate; 13. Fixed locking bolt; 14. Modular mounting part; 15. Limiting support frame; 16. First sliding limit slot; 17. Mounting slot; 18. Second sliding limit slot; 19. Sliding drive toothed plate; 20. Limiting adjustment plate; 21. Third sliding limit slot; 22. Fixed mounting plate; 23. First sliding outer frame; 24. Fixed threaded hole; 25. Fixed threaded post; 26. Sliding mounting bracket; 27. Mounting support plate; 28. Mounting hole; 29. ​​Cooling fan; 30. Sliding adjustment bracket; 31. Drive control gear; 32. Limiting mounting vertical plate; 33. Motor; 34. Electric adjustment push rod; 35. Second sliding outer frame; 36. Connecting post; 37. Connecting plug; 38. Electric push rod; 39. First rotating shield; 40. Second rotating shield; 41. Drive motor; 42. Drive adjustment gear; 43. Track support plate; 44. Mounting platform; 45. First rotating adjustment gear ring; 46. Second rotating adjustment gear ring. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figures 1-2 and Figures 3-7 As shown, a harmonic filter for improving power quality according to the present invention includes a harmonic filter body 4. A first sealing connecting plate 2 and a second sealing connecting plate 6 are respectively fixedly connected to both ends of an outer frame cover 5 in the harmonic filter body 4 by bolts. A connecting end 1 is uniformly fixedly arranged on the side of the first sealing connecting plate 2 away from the outer frame cover 5. A sealing protective cover 3 is fixedly installed on both sides of the outer frame cover 5 near the connecting end 1 by bolts. A limit support frame 15 is fixedly installed inside the outer frame cover 5 by bolts. Modular mounting parts 14 are symmetrically arranged on the limit support frame 15. Mounting grooves 17 are opened through both sides of the front end of the outer frame cover 5. First sliding limit slots 16 are opened on both sides of the mounting grooves 17. Second sliding limit slots 18 are opened in the middle and on both sides of the limit support frame 15. The second sliding limit slots 18 serve to limit and adjust the movement, and the limit support frame 15 serves to support and limit the movement.

[0035] like Figure 8-9 As shown, this modular mounting section 14 includes a sliding drive toothed plate 19, a limit adjustment plate 20, a third sliding limit groove 21, a fixed mounting plate 22, a first sliding outer frame 23, a fixed threaded hole 24, a fixed threaded post 25, a sliding mounting bracket 26, a mounting hole 28, and a second sliding outer frame 35. The first sliding outer frame 23 and the second sliding outer frame 35 are symmetrically distributed. Limit adjustment plates 20 are provided inside both the first sliding outer frame 23 and the second sliding outer frame 35. Fixed mounting plates 22 are fixedly installed on the upper ends of both sides of the limit adjustment plate 20, and the fixed mounting plates 22 are fixedly installed on the first sliding outer frame 23 by bolts. On the sliding outer frame 23, fixed threaded holes 24 are evenly opened on the limit adjustment plate 20, and the third sliding limit groove 21 is evenly opened on the limit adjustment plate 20. The two sides of the sliding mounting bracket 26 are slidably engaged with the third sliding limit groove 21. The mounting holes 28 are evenly opened through the sliding mounting bracket 26. The fixed threaded post 25 is threaded through and inserted into the two sides of the sliding mounting bracket 26, and the fixed threaded post 25 is adapted to the fixed threaded hole 24. The sliding drive tooth plate 19 is symmetrically fixed on the upper inner side of the first sliding outer frame 23 and the second sliding outer frame 35 by bolts. Each frame is provided with 2 drive tooth plates 19. The bottom of the first sliding outer frame 23 and the second sliding outer frame 35 are both fixedly installed with mounting support plates 27. Cooling fans 29 are evenly fixedly installed on the mounting support plates 27, and the cooling fans 29 are located directly below the sliding mounting bracket 26. The rotating drive control gear 31 can cause the first sliding outer frame 23 or the second sliding outer frame 35 at the corresponding position to slide outward along the second sliding limit slot 18 through the sliding drive tooth plate 19. Activating the electric adjustment push rod 34 can cause the sliding adjustment bracket 30 to slide laterally along the inside of the first sliding limit slot 16, thereby adjusting and controlling the drive control gear 31 to move to the sliding drive tooth plate 19 connected to the first sliding outer frame 23 or the second sliding outer frame 35. This allows for precise adjustment and control of the modules and components installed on the first sliding outer frame 23 or the second sliding outer frame 35 to slide outward individually from the inside of the outer frame cover 5.

[0036] A sliding adjustment bracket 30 is provided above the second sliding outer frame 35. Limiting mounting plates 32 are fixedly installed at the bottom of both ends of the sliding adjustment bracket 30. Drive control gears 31 are symmetrically mounted between the limiting mounting plates 32. An electric adjustment push rod 34 is provided above the sliding adjustment bracket 30, and the front end of the electric adjustment push rod 34 is fixedly connected to the middle of the sliding adjustment bracket 30. A motor 33 is fixedly installed on the limiting mounting plate 32 located on the outer side, and the drive end of the motor 33 is fixedly connected to the middle of the drive control gear 31. Connecting pins 36 are evenly fixedly installed on the inner side of the end of the first sliding outer frame 23. Electric push rods 38 are evenly fixedly installed on the inner side of the end of the second sliding outer frame 35. A connecting plug 37 is fixedly connected to the front end of the electric push rod 38. The connector 37 is fitted with the locking hole on the docking connector 36. The electric push rods 38, evenly distributed on the second sliding outer frame 35, are activated to move the connector 37 forward and insert it into the docking connector 36. At this point, regardless of whether the drive control gear 31 is on the sliding drive gear plate 19 on the first sliding outer frame 23 or the second sliding outer frame 35, starting the motor 33 will drive the drive control gear 31 to rotate, causing the first sliding outer frame 23 or the second sliding outer frame 35 to slide out synchronously. This means that each frame can be controlled to slide out individually, or both frames can be controlled to slide out simultaneously, enabling rapid removal for maintenance or installation / removal based on different maintenance needs, avoiding the need for complete removal due to faults.

[0037] The first sliding outer frame 23 and the second sliding outer frame 35 are slidably engaged on the second sliding limit slot 18, the two sides of the sliding adjustment bracket 30 are slidably engaged inside the first sliding limit slot 16, and the electric adjustment push rod 34 is fixedly installed inside the mounting slot 17.

[0038] Two drive control gears 31 are meshed with the corresponding sliding drive gear plate 19 of the frame. The sliding adjustment bracket 30, drive control gears 31 and electric adjustment push rod 34 are all located inside the sealing protective cover 3, which plays a sealing and protective role.

[0039] The working principle of Embodiment 1 is as follows: After removing the first sealing connecting plate 2, two first sliding outer frames 23 and a second sliding outer frame 35 are set inside the outer frame cover 5, so that four sliding outer frames for installing modules and components are set inside the outer frame cover 5. During use, each of the four sliding outer frames can be slid outward from the inside of the outer frame cover 5 individually, which facilitates the installation, disassembly and maintenance of modules or components inside each sliding outer frame. The motor 33 set at the corresponding position is started, and the motor 33 drives the drive control gear 31 to rotate. The rotating drive control gear 31 passes through the sliding outer frame 35. The drive gear plate 19 allows the first sliding outer frame 23 or the second sliding outer frame 35 at the corresponding position to slide outward along the second sliding limit groove 18. Activating the electric adjustment push rod 34 allows the sliding adjustment bracket 30 to slide laterally along the inside of the first sliding limit groove 16, thereby adjusting and controlling the drive control gear 31 to move onto the sliding drive gear plate 19 connected to the first sliding outer frame 23 or the second sliding outer frame 35. This allows for precise adjustment and control of the modules and components mounted on the first sliding outer frame 23 or the second sliding outer frame 35. The inner part of the outer frame 5 slides outward and is discharged. The electric push rods 38, evenly distributed on the second sliding outer frame 35, control the connecting plug 37 to move forward and extend into the docking connecting post 36. At this time, regardless of whether the drive control gear 31 is on the sliding drive tooth plate 19 on the first sliding outer frame 23 or the second sliding outer frame 35, as long as the motor 33 is started to drive the drive control gear 31 to rotate, the first sliding outer frame 23 or the second sliding outer frame 35 will slide outward synchronously. That is, each frame can be controlled to slide out individually, or both frames can be controlled simultaneously. The sliding adjustment bracket 30 slides outwards, enabling quick removal for maintenance or disassembly based on different maintenance situations, avoiding the need for complete removal due to malfunctions. Furthermore, a laser rangefinder is fixedly installed at the front end of the sliding adjustment bracket 30 and inside the mounting slot 17. The laser rangefinder can determine the distance and position of the sliding adjustment bracket 30, thereby determining whether the drive control gear 31 is located on the sliding drive tooth plate 19 installed on the first sliding outer frame 23 or the second sliding outer frame 35. This allows for precise outward sliding control of the first sliding outer frame 23 and the second sliding outer frame 35.

[0040] Cooling fans 29 are evenly arranged inside the first sliding outer frame 23 and the second sliding outer frame 35. The evenly arranged cooling fans 29 can provide real-time heat dissipation for the modules or components installed inside the first sliding outer frame 23 or the second sliding outer frame 35. According to the size of the modules and components, the sliding mounting bracket 26 can be controlled and adjusted by screwing the fixing threaded post 25 into the fixing threaded hole 24 at different positions. The position of the sliding mounting bracket 26 can be adjusted so that modules or components of different sizes can be conveniently and properly fixed inside the first sliding outer frame 23 or the second sliding outer frame 35.

[0041] Example 2

[0042] Based on Example 1, such as Figure 1-3 As shown, an auxiliary support adjustment part 7 is provided at the bottom center of the outer frame cover 5. The auxiliary support adjustment part 7 includes a threaded hole 8, a fixed connecting plate 9, a fixed mounting hole 10, a rotating support base 11, a fixed plate 12, and a fixed locking bolt 13. The fixed mounting hole 10 is evenly opened through the edge of the fixed plate 12. The middle part of the rotating support base 11 is rotatably engaged with the middle part of the fixed plate 12. The fixed connecting plate 9 is fixedly connected to the upper center of the rotating support base 11. The threaded holes 8 are evenly opened on the fixed connecting plate 9, the rotating support base 11, and the fixed plate 12. The fixed locking bolt 13 is threaded into the rotating support base 11 and the fixed plate 12. The fixed connecting plate 9 is fixedly connected to the bottom center of the outer frame cover 5 by bolts.

[0043] In this embodiment, the fixed plate 12 can be fixedly installed through the fixed mounting hole 10, thereby fixing the auxiliary support adjustment part 7 as a whole. The harmonic filter body 4 is fixed together with the auxiliary support adjustment part 7. When the position and angle of the harmonic filter body 4 need to be adjusted and controlled after the harmonic filter body 4 is fixed, the fixing locking bolt 13 is adjusted and screwed out from the inside of the rotating support base 11 and the fixed plate 12. This allows the fixed connecting plate 9 and the rotating support base 11 to rotate on the fixed plate 12 to adjust and control the position and angle of the harmonic filter body 4. After adjustment, the fixing locking bolt 13 is inserted between the rotating support base 11 and the fixed plate 12 to lock the rotating support base 11 and the fixed plate 12, thus locking the harmonic filter body 4 in place. Threaded holes 8 are evenly provided on the rotating support base 11 and the fixed plate 12, allowing the rotating support base 11 to be fixed after rotating to any specified angle. This makes the installation and use of the harmonic filter body 4 convenient, and allows for adjustment and fixing at any angle.

[0044] Example 3

[0045] Based on Example 2, such as Figure 10-12 As shown, the harmonic filter body 4 is provided with a shielding protection device on its exterior. The shielding protection device includes a first rotating shield 39, a second rotating shield 40, a drive motor 41, a drive adjusting gear 42, a track support plate 43, a mounting platform 44, a first rotating adjusting gear ring 45, and a second rotating adjusting gear ring 46. The mounting platform 44 is fixedly installed at the upper middle part of the track support plate 43. The bottom ends of the first rotating adjusting gear ring 45 and the second rotating adjusting gear ring 46 are rotatably engaged with the track support plate 43, and the first rotating adjusting gear ring 45 is located outside the second rotating adjusting gear ring 46. The bottom end of the second rotating shield 40 is fixedly connected to the outer edge of the second rotating adjusting gear ring 46. The bottom end of the first rotating shield 39 is fixedly connected to the inner edge of the first rotating adjusting gear ring 45. The drive motor 41 is fixedly installed on the track support plate 43, and the two drive motors 41 are respectively meshed with the first rotating adjusting gear ring 45 and the second rotating adjusting gear ring 46.

[0046] In this embodiment, the harmonic filter body can be mounted on the mounting platform 44 by fixing the mounting plate 12 to the mounting platform 44. When external electromagnetic interference occurs during the use of the harmonic filter, the drive motor 41 is started to drive the drive adjustment gear 42 at the end to rotate, thereby driving the first rotation adjustment gear ring 45 and the second rotation adjustment gear ring 46 to rotate. This causes the second rotation shield 40, which is retracted into the first rotation shield 39, to rotate out and rotate to align with the first rotation shield 39 until the harmonic filter is covered inside the second rotation shield 40 and the first rotation shield 39 to achieve protection. Furthermore, according to the direction and position of the external electromagnetic interference, the position and angle of the first rotation shield 39 and the second rotation shield 40 can be adjusted and controlled. This allows the drive motor 41 to automatically operate against external electromagnetic interference, and can automatically adjust the direction and position of the protection, adjust and control the overlap of the first rotation shield 39 and the second rotation shield 40, and automatically adapt and control the level and intensity of protection.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A harmonic filter for improving power quality, comprising a harmonic filter body (4), characterized in that: The outer frame (5) of the harmonic filter body (4) is fixedly connected to the first sealing connection plate (2) and the second sealing connection plate (6) by bolts at both ends. The first sealing connection plate (2) is evenly fixedly provided with a connection end (1) on the side away from the outer frame (5). The outer frame (5) is fixedly installed with a sealing protective cover (3) on both sides of the end close to the connection end (1) by bolts. The inner side of the outer frame (5) is fixedly installed with a limit support frame (15) by bolts. The limit support frame (15) is symmetrically provided with a modular installation part (14). The front end of the outer frame cover (5) is provided with mounting grooves (17) on both sides, and the mounting grooves (17) are provided with first sliding limit slots (16) on both sides. The middle and both sides of the limit support frame (15) are provided with second sliding limit slots (18). The modular mounting part (14) includes a sliding drive toothed plate (19), a limit adjustment plate (20), a third sliding limit groove (21), a fixed mounting plate (22), a first sliding outer frame (23), a fixed threaded hole (24), a fixed threaded column (25), a sliding mounting bracket (26), a mounting hole (28), and a second sliding outer frame (35). The sliding drive toothed plate (19) is symmetrically fixed to the inner upper end of the first sliding outer frame (23) and the second sliding outer frame (35) by bolts. A sliding adjustment bracket (30) is provided above the second sliding outer frame (35). Limiting mounting vertical plates (32) are fixedly installed at the bottom of both ends of the sliding adjustment bracket (30). Drive control gears (31) are symmetrically rotated between the limiting mounting vertical plates (32). An electric adjustment push rod (34) is provided above the sliding adjustment bracket (30). The inner side of the end of the first sliding outer frame (23) is uniformly fixed with a docking connection pin (36), and the inner side of the end of the second sliding outer frame (35) is uniformly fixed with an electric push rod (38). The front end of the electric push rod (38) is fixedly connected with a connector (37), and the connector (37) is adapted to the pin hole provided on the docking connection pin (36). The first sliding outer frame (23) and the second sliding outer frame (35) are slidably engaged on the second sliding limiting slot (18), and the two sides of the sliding adjustment bracket (30) are slidably engaged inside the first sliding limiting slot (16). The electric adjustment push rod (34) is fixedly installed inside the mounting slot (17). The two drive control gears (31) are meshed with the sliding drive tooth plate (19) of the corresponding frame. Activating the electric adjustment push rod (34) can cause the sliding adjustment bracket (30) to slide laterally along the inside of the first sliding limit slot (16), thereby adjusting and controlling the drive control gears (31) to move onto the sliding drive tooth plate (19) connected to the first sliding outer frame (23) or the second sliding outer frame (35).

2. A harmonic filter for improving power quality according to claim 1, characterized in that: The first sliding outer frame (23) and the second sliding outer frame (35) are symmetrically distributed. Both the first sliding outer frame (23) and the second sliding outer frame (35) have a limit adjustment plate (20) inside. A fixing plate (22) is fixedly installed on the upper ends of both sides of the limit adjustment plate (20), and the fixing plate (22) is fixedly installed on the first sliding outer frame (23) by bolts. The fixing threaded holes (24) are evenly distributed on the limit adjustment plate (20). The third sliding limit slot (21) is evenly opened on the limit adjustment plate (20). The two sides of the sliding mounting bracket (26) are slidably engaged with the third sliding limit slot (21). The mounting holes (28) are evenly opened through the sliding mounting bracket (26). The fixed threaded post (25) is threaded through and inserted into the two sides of the sliding mounting bracket (26). The fixed threaded post (25) is adapted to the fixed threaded hole (24). Each frame is provided with two drive tooth plates (19).

3. A harmonic filter for improving power quality according to claim 2, characterized in that: The bottom of the first sliding outer frame (23) and the second sliding outer frame (35) are both fixedly installed with mounting support plates (27). Cooling fans (29) are evenly fixedly installed on the mounting support plates (27), and the cooling fans (29) are located directly below the sliding mounting bracket (26).

4. A harmonic filter for improving power quality according to claim 3, characterized in that: The front end of the electric adjustment push rod (34) is fixedly connected to the middle of the sliding adjustment bracket (30), and a motor (33) is fixedly installed on the limiting mounting vertical plate (32) located on the outer side, and the driving end of the motor (33) is fixedly connected to the middle of the drive control gear (31).

5. A harmonic filter for improving power quality according to claim 4, characterized in that: The sliding adjustment bracket (30), drive control gear (31) and electric adjustment push rod (34) are all located inside the sealed protective cover (3), and an auxiliary support adjustment part (7) is provided at the bottom center of the outer frame cover (5).

6. A harmonic filter for improving power quality according to claim 5, characterized in that: The auxiliary support adjustment part (7) includes a threaded hole (8), a fixed connecting plate (9), a fixed mounting hole (10), a rotating support base (11), a fixed plate (12), and a fixed locking bolt (13). The fixed mounting hole (10) is evenly opened through the edge of the fixed plate (12). The middle part of the rotating support base (11) is rotatably engaged with the middle part of the fixed plate (12). The fixed connecting plate (9) is fixedly connected to the upper middle part of the rotating support base (11). The threaded hole (8) is evenly opened on the fixed connecting plate (9), the rotating support base (11), and the fixed plate (12). The fixed locking bolt (13) is threaded into the rotating support base (11) and the fixed plate (12). The fixed connecting plate (9) is fixedly connected to the bottom middle part of the outer frame cover (5) by bolts.

7. A harmonic filter for improving power quality according to claim 6, characterized in that: The harmonic filter body (4) is provided with a shielding protection device on its exterior. The shielding protection device includes a first rotating shield (39), a second rotating shield (40), a drive motor (41), a drive adjusting gear (42), a track support plate (43), a mounting platform (44), a first rotating adjusting gear ring (45), and a second rotating adjusting gear ring (46). The mounting platform (44) is fixedly installed in the upper middle part of the track support plate (43). The bottom ends of the first rotating adjusting gear ring (45) and the second rotating adjusting gear ring (46) are rotatably engaged with the track support plate. On the disc (43), the first rotating adjusting gear ring (45) is located outside the second rotating adjusting gear ring (46), the bottom end of the second rotating shield (40) is fixedly connected to the outer edge of the second rotating adjusting gear ring (46), the bottom end of the first rotating shield (39) is fixedly connected to the inner edge of the first rotating adjusting gear ring (45), the drive motor (41) is fixedly installed on the track support disc (43), and the two drive motors (41) are respectively meshed with the first rotating adjusting gear ring (45) and the second rotating adjusting gear ring (46).

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