Four-phase four-column reactor for power electronic device

Abstract

The invention relates to the technical field of power electronics, and particularly discloses a four-phase four-column reactor for a power electronic device, the four-phase four-column reactor comprises a lower clamping piece, a connecting rod and an upper clamping piece, the connecting rod is fixedly mounted on the outer surface of the lower clamping piece, the upper clamping piece is fixedly connected to one end, away from the lower clamping piece, of the connecting rod, and a middle column is arranged between the lower clamping piece and the upper clamping piece; according to the device, the middle column and the coil can be flexibly fixed through the limiting assembly, so that the device has a certain buffering effect during vibration, noise generated when the device generates vibration is reduced, meanwhile, the middle column can be positioned when large shaking is generated, and the situation that the device is damaged due to long-time large shaking is prevented; according to the reactor provided by the invention, the temperature of the middle columns and the temperature of the coils are relatively uniform, the aging of insulating materials is prevented, and airflow can be conveyed between the middle columns and the coils during accelerating and flowing, so that the heat dissipation effect is better, and the service life of the reactor is conveniently prolonged.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a four-phase four-column reactor for a power electronic device. Background Art

[0002] With the rapid development of power electronics, large-scale power electronic equipment is increasingly being used across various industries, with ever-increasing power levels and stricter restrictions on device size. Magnetic components are one of the most critical components in power electronic equipment, largely determining the performance, efficiency, and size of the entire device. For applications involving three-phase unbalanced loads and high voltage quality, a three-phase, four-wire circuit design is being adopted. Specifically, this involves a three-phase, four-wire, four-leg circuit topology. Conventionally, this approach uses four single-phase reactors. Four reactors are not only expensive but also take up a lot of space.

[0003] The existing technology still has the following problems:

[0004] 1. During the operation of traditional reactors, changes in their magnetic field cause the reactor to vibrate. Reactors are mostly fixed with bolts. Long-term vibration can loosen the bolts, resulting in loose connections between components. As a result, the coil vibration during operation of the reactor generates noise. Fixed connections cannot absorb and reduce vibration, resulting in high noise levels. In addition, when the reactor needs to be replaced or repaired, the fixed connection method usually requires the disassembly of a large number of connecting components, which consumes a lot of time and manpower.

[0005] 2. Existing reactors have poor heat dissipation efficiency. Fans are all installed on the reactors in a fixed connection. The fixed-position fans can only dissipate heat in specific areas of the reactor, resulting in large temperature differences in different parts of the reactor. The parts close to the fans have good heat dissipation and lower temperatures; while the parts far from the fans have insufficient heat dissipation and higher temperatures. Under long-term operation, the high-temperature areas may accelerate the aging of the insulation material, reduce the service life of the reactor, and even cause faults such as insulation breakdown. In addition, the coil and the center column are tightly connected, and the heat generated during operation is high, making it impossible to use metal sheet alignment for cooling. Summary of the Invention

[0006] In order to overcome the vibration of the inductor caused by the change of the magnetic field, the inductor is mostly fixed with bolts. Long-term vibration will cause the bolts to loosen, resulting in an insufficiently tight connection between the components. As a result, the coil vibration during the operation of the inductor will generate noise, and the fixed connection cannot absorb and reduce the vibration, resulting in a high noise level. In addition, when the inductor needs to be replaced or repaired, the fixed connection method usually requires the disassembly of a large number of connecting components, which consumes a lot of time and manpower. The heat dissipation efficiency of the inductor is poor, and the fans are all installed on the inductor in a fixed connection manner. The fans in fixed positions can only dissipate heat to a specific area of ​​the inductor, resulting in a large temperature difference in different parts of the inductor. The parts close to the fan have good heat dissipation effect and lower temperature; while the parts far away from the fan have insufficient heat dissipation and high temperature. Under long-term operation, the high-temperature area may accelerate the aging of the insulating material, reduce the service life of the reactor, and even cause insulation breakdown and other faults. The purpose of the present invention is to provide a four-phase four-column inductor for power electronic devices to solve the above-mentioned shortcomings.

[0007] The present application provides a four-phase four-column reactor for a power electronic device, comprising a lower clamp, a connecting rod and an upper clamp, wherein the connecting rod is fixedly installed on the outer surface of the lower clamp, and the end of the connecting rod away from the lower clamp is fixedly connected to the upper clamp, a middle column is arranged between the lower clamp and the upper clamp, a coil is sleeved on the outer surface of the middle column, and limiting components are arranged at both ends of the middle column, the limiting components are respectively located on the inner walls of the lower clamp and the upper clamp, and a heat dissipation component is arranged below the top arm of the upper clamp, the limiting component comprises a limit frame, the inner wall of the limit frame is fixedly installed with a limit rod, the outer surface of the limit rod is slidably connected to a slider, the inner cavity of the limit frame is rotatably connected to a first threaded rod, buffer mechanisms are arranged on both sides of the limit frame, a positioning mechanism is arranged on the middle inner wall of the limit frame, a clamping mechanism is arranged on the lower surface of the slider, the slider and the first threaded rod are connected by threads, and the thread directions at both ends of the first threaded rod are opposite.

[0008] Furthermore, the buffer mechanism includes a fixing bar, a fixing rod is fixedly installed on the inner wall of the fixing bar, the outer surface of the fixing bar is slidably connected to the buffer seat, the inner cavity of the buffer seat is rotatably connected to the connecting bar, a first spring is provided in the middle part of the fixing bar, the end of the connecting bar away from the buffer seat is rotatably connected to the limiting bar, the lower clamp and the upper clamp are both fixedly connected to the fixing bar, the two ends of the first spring are in contact with the buffer seat, and the limiting bar is in close contact with the outer surface of the limiting frame.

[0009] Furthermore, the positioning mechanism includes a positioning block, a positioning groove is provided on the outer surface of the positioning block, a moving block is fixedly installed on the middle part of the limit frame, the inner cavity of the moving block is slidably connected to an elastic rod, one end of the elastic rod is sleeved with a second spring, the outer surface of the elastic rod is fixedly installed with a first connecting block, a button is provided on the outer surface of the moving block, a speaker is fixedly installed on the outer surface of the moving block, and the end of the elastic rod close to the positioning block is rollingly connected to a positioning ball.

[0010] Furthermore, the second spring is located between the first connecting block and the inner wall of the moving block, the first connecting block and the moving block are slidingly connected, the button and the speaker are electrically connected, pressing the button controls the speaker to sound an alarm, the lower clamp and the upper clamp are fixedly connected to the positioning block, the two positioning grooves on the positioning block are symmetrically distributed about the middle part of the positioning block, and the positioning ball and the inner wall of the middle part of the positioning block are tightly fitted.

[0011] Furthermore, the clamping mechanism includes a second connecting block, the inner cavity of the second connecting block is provided with a clamping block, the two ends of the clamping block are fixedly installed with a first sliding rod, the outer surface of the first sliding rod is sleeved with a third spring, the inner cavity of the clamping block is rotatably connected to the second threaded rod, the outer surface of the clamping block is slidably connected to the clamping arm, the inner wall of the second connecting block is slidably connected to the limiting block, the outer surface of the limiting block is fixedly installed with a gear rod, the bottom end of the second connecting block is fixedly installed with a connecting seat, and the outer surface of the connecting seat is provided with a fourth spring.

[0012] Furthermore, the second connecting block and the slider are slidably connected, the clamping block and the outer surface of the middle column are in close contact, the second connecting block and the outer surface of the middle column are fitted together, the third spring is located between the second connecting block and the clamping block, the first sliding rod and the second connecting block are slidably connected, the second threaded rod and the clamping arm are threadedly connected, and the thread directions at both ends of the second threaded rod are opposite, the limit block is inclined civilized near the corner of the clamping block, and when it contacts the clamping block, it drives the limit block to move away from the second connecting block, the fourth spring is located between the connecting seat and the limit block, the gear rod is in close contact with the outer surfaces of the second connecting block, and the outer surface of the limit block is in contact with the coil.

[0013] Furthermore, the heat dissipation assembly includes a connecting frame, the inner cavity of the connecting frame is rotatably connected to a gear, a motor is provided in the middle part of the connecting frame, the output end of the motor is socketed with the gear, the inner cavity of the connecting frame is slidably connected to a gear rack, and heat dissipation mechanisms are provided at both ends of the gear rack, a connecting plate is fixedly installed on the outer surface of the gear rack, and a protrusion is fixedly installed on the outer surface of the connecting plate. There are four protrusions, a ventilation mechanism is provided between the middle column and the coil, the connecting frame and the lower surface of the upper clamp are fixedly connected, a tooth block is provided in the inner cavity of the gear rack, and the tooth block of the gear rack is meshed with the gear, half of the gear is smooth, the connecting plate and the upper clamp are slidably connected, there are four middle columns and four coils, and the four middle columns are respectively set as A phase column, B phase column, C phase column and N phase column, the spacing between the middle columns is equal to the spacing between the protrusions, and the protrusions protrude downward.

[0014] Furthermore, the heat dissipation mechanism includes a fixed block, an inner cavity of the fixed block is provided with a slide groove, the inner cavity of the fixed block is provided with a buffer block, a second slide rod is fixedly installed on the outer surface of the buffer block, the second slide rod and the slide groove are slidably connected, the outer surface of the second slide rod is sleeved with a fifth spring, the fifth spring is located between the buffer block and the inner wall of the fixed block, the outer surface of the buffer block is provided with a fan, the fixed block and the gear rack are fixedly connected, and the fan is located above the limit assembly.

[0015] Furthermore, the ventilation mechanism includes a metal plate, on the inner walls of both ends of the metal plate are fixedly installed shielding strips, the outer surface of the shielding strips is provided with connecting holes, the inner cavity of the metal plate is slidably connected to a heat sink, the outer surface of the heat sink is provided with ventilation holes, shielding rods are fixedly installed at both ends of the heat sink, an extrusion rod is fixedly installed in the middle part of the heat sink, and the outer surface of the extrusion rod is sleeved with a sixth spring.

[0016] Furthermore, the extrusion rod and the shielding strip are slidably connected, the sixth spring is located between the heat dissipation plate and the shielding strip, the shielding rod and the connecting hole are slidably connected, the shielding rod and the connecting hole are disengaged, the metal plate is located between the center column and the coil, the top end of the extrusion rod is located on the lower surface of the connecting plate, and when the connecting plate moves, the protrusion squeezes the top end of the extrusion rod.

[0017] The technical solution provided by this application has at least the following technical effects or advantages:

[0018] 1. The use of a limiting component effectively solves the problem that the change in the magnetic field of a traditional reactor during operation will cause the reactor to vibrate. The reactor is mostly fixed with bolts, and long-term vibration will cause the bolts to loosen, resulting in an insufficiently tight connection between the components. As a result, the vibration of the coil during the operation of the reactor will generate noise, and the fixed connection cannot absorb and reduce the vibration, resulting in a high noise level. In addition, when the reactor needs to be replaced or repaired, the fixed connection method usually requires the disassembly of a large number of connecting components, which consumes a lot of time and manpower. The present invention can flexibly fix the center column and the coil through the limiting component, so that the equipment has a certain buffering effect when vibrating, reducing the noise generated by the equipment when vibrating, and at the same time can position the center column when large shaking occurs, preventing long-term large shaking from damaging the equipment, and issuing an alarm to remind staff to perform timely maintenance. In addition, the reactor is easy to disassemble when maintenance is required, which can improve maintenance efficiency.

[0019] 2. The use of heat dissipation components effectively solves the problem of poor heat dissipation efficiency of existing reactors. Fans are installed on the reactor in a fixed connection manner. Fans in fixed positions can only dissipate heat to specific areas of the reactor, resulting in large temperature differences in different parts of the reactor. The parts close to the fans have good heat dissipation effects and lower temperatures; while the parts far away from the fans have insufficient heat dissipation, and the high temperature areas may accelerate the aging of insulating materials under long-term operation, reduce the service life of the reactor, and even cause insulation breakdown and other faults. In addition, the coil and the center column are tightly connected, and the heat generated during operation is high, and it is impossible to use metal sheet alignment for cooling. The present invention can evenly dissipate heat for the equipment through the heat dissipation component, so that the temperatures of multiple center columns and coils are relatively uniform, preventing aging of insulating materials, and can transport the airflow between the center column and the coil when accelerating the flow simultaneously, thereby improving the heat dissipation effect and facilitating the increase in the service life of the reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the embodiment of the present application;

[0021] Figure 2 Schematic diagram of the center column structure in the embodiment of the present application;

[0022] Figure 3 Schematic diagram of the structure of the limit assembly in the embodiment of the present application;

[0023] Figure 4 Schematic diagram of the limit frame structure in the embodiment of the present application;

[0024] Figure 5 Schematic diagram of the buffer mechanism structure in an embodiment of the present application;

[0025] Figure 6 Schematic diagram of the cross-section of the positioning mechanism structure in the embodiment of the present application;

[0026] Figure 7 Schematic diagram of the clamping mechanism structure in an embodiment of the present application;

[0027] Figure 8 This is a schematic diagram of the structure of the second threaded rod in an embodiment of the present application;

[0028] Figure 9 For the embodiment of this application Figure 8 A schematic diagram of the structure at point A in the middle;

[0029] Figure 10 Schematic diagram of the heat dissipation assembly structure in an embodiment of the present application;

[0030] Figure 11 Schematic diagram of the heat dissipation mechanism in an embodiment of the present application;

[0031] Figure 12 A schematic diagram of the partial structure of the ventilation mechanism in an embodiment of the present application;

[0032] Figure 13 This is a schematic diagram of the four-phase four-column reactor in an embodiment of the present application.

[0033] In the figure: 1, lower clamp; 2, connecting rod; 3, upper clamp; 4, middle column; 5, coil; 6, limit assembly; 61, limit frame; 62, limit rod; 63, slider; 64, first threaded rod; 65, buffer mechanism; 651, fixing bar; 652, fixing rod; 653, buffer seat; 654, connecting bar; 655, first spring; 656, limit bar; 66, positioning mechanism; 661, positioning block; 662, positioning groove; 663, moving block; 664, elastic rod; 665, second spring; 666, first connecting block; 667, button; 668, speaker; 669, positioning ball; 67, clamping mechanism; 671, second connecting block; 672, clamping block; 673, first Slide rod; 674, third spring; 675, second threaded rod; 676, clamping arm; 677, limit block; 678, gear lever; 679, connecting seat; 6710, fourth spring; 7, heat dissipation assembly; 71, connecting frame; 72, gear; 73, motor; 74, gear rack; 75, heat dissipation mechanism; 751, fixing block; 752, slide groove; 753, buffer block; 754, second slide rod; 755, fifth spring; 756, fan; 76, connecting plate; 77, protrusion; 78, ventilation mechanism; 781, metal plate; 782, shielding strip; 783, connecting hole; 784, heat dissipation plate; 785, ventilation hole; 786, shielding rod; 787, extrusion rod; 788, sixth spring. DETAILED DESCRIPTION

[0034] Long-term vibration may cause the bolts to loosen. The present invention can flexibly fix the center column and the coil through the limit assembly, so that the equipment has a certain buffering effect when vibrating, and reduce the noise generated by the equipment when vibrating; the fan in a fixed position can only dissipate heat to a specific area of ​​the inductor. The present invention can evenly dissipate heat to the equipment through the heat dissipation assembly, so that the temperature of multiple center columns and coils is relatively uniform, preventing aging of the insulation material.

[0035] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] See also Figure 1 and Figure 2As shown, a four-phase four-column reactor for a power electronic device includes a lower clamp 1, a connecting rod 2 and an upper clamp 3. The connecting rod 2 is fixedly installed on the outer surface of the lower clamp 1, and the upper clamp 3 is fixedly connected to the end of the connecting rod 2 away from the lower clamp 1. A middle column 4 is arranged between the lower clamp 1 and the upper clamp 3, and a coil 5 is sleeved on the outer surface of the middle column 4. Limiting components 6 are provided at both ends of the middle column 4. The limiting components 6 are respectively located on the inner walls of the lower clamp 1 and the upper clamp 3. A heat dissipation component 7 is provided under the top arm of the upper clamp 3. The connecting rod 2 is used to connect the lower clamp 1 and the upper clamp 3. The limiting component 6 limits the middle column 4 so that it is flexibly installed between the lower clamp 1 and the upper clamp 3. The heat dissipation component 7 is used to uniformly dissipate heat to the middle column 4 and the coil 5, and to achieve internal ventilation of the middle column 4 and the coil 5.

[0037] See also Figure 2 and Figure 4 As shown, the limit assembly 6 includes a limit frame 61, an inner wall of the limit frame 61 is fixedly installed with a limit rod 62, an outer surface of the limit rod 62 is slidably connected to a slider 63, the inner cavity of the limit frame 61 is rotatably connected to a first threaded rod 64, and buffer mechanisms 65 are provided on both sides of the limit frame 61, a positioning mechanism 66 is provided on the middle inner wall of the limit frame 61, and a clamping mechanism 67 is provided on the lower surface of the slider 63. The slider 63 and the first threaded rod 64 are threadedly connected, and the thread directions at both ends of the first threaded rod 64 are opposite. By rotating the first threaded rod 64, the slider 63 is driven to move on the limit rod 62, so that the distance between the sliders 63 changes, which is convenient for controlling the distance of the clamping mechanism 67, so that the clamping mechanism 67 can flexibly fix the center column 4 according to the specifications of the center column 4. The buffer mechanism 65 is used to flexibly limit the limit frame 61, and the positioning mechanism 66 is used to position the limit frame 61 and issue an alarm when the limit frame 61 produces a large shake, reminding the staff to maintain the equipment and improving the service life of the equipment.

[0038] See also Figure 4 、 Figure 5 and Figure 6As shown, the buffer mechanism 65 includes a fixing bar 651, an inner wall of the fixing bar 651 is fixedly installed with a fixing rod 652, an outer surface of the fixing rod 652 is slidably connected to a buffer seat 653, an inner cavity of the buffer seat 653 is rotatably connected to a connecting bar 654, a middle part of the fixing bar 652 is provided with a first spring 655, an end of the connecting bar 654 away from the buffer seat 653 is rotatably connected to a limiting bar 656, the lower clamp 1 and the upper clamp 3 are both fixedly connected to the fixing bar 651, both ends of the first spring 655 are in contact with the buffer seat 653, the limiting bar 656 is in close contact with the outer surface of the limiting frame 61, the positioning mechanism 66 includes a positioning block 661, an outer surface of the positioning block 661 is provided with a positioning groove 662, and the middle part of the limiting frame 61 is fixedly installed with a movable The inner cavity of the moving block 663 is slidably connected with an elastic rod 664, one end of the elastic rod 664 is sleeved with a second spring 665, the outer surface of the elastic rod 664 is fixedly installed with a first connecting block 666, the outer surface of the moving block 663 is provided with a button 667, the outer surface of the moving block 663 is fixedly installed with a speaker 668, the end of the elastic rod 664 close to the positioning block 661 is rollingly connected with a positioning ball 669, the second spring 665 is located between the first connecting block 666 and the inner wall of the moving block 663, the first connecting block 666 and the moving block 663 are slidably connected, the button 667 and the speaker 668 are electrically connected, and the pressing of the button 667 controls the speaker 668 to sound an alarm, the lower clamp 1 and the upper clamp 3 are both fixedly connected with the positioning block 661, the positioning block 661 is fixedly connected with a positioning ball 669, the second spring 665 is located between the first connecting block 666 and the inner wall of the moving block 663, the first connecting block 666 and the moving block 663 are slidably connected, the button 667 and the speaker 668 are electrically connected, and the pressing of the button 667 controls the speaker 668 to sound an alarm, the lower clamp 1 and the upper clamp 3 are fixedly connected with the positioning block 661, the positioning block 661 is fixedly connected with the positioning ball 669, the second spring 665 is located between the first connecting block 666 and the inner wall of the moving block The two positioning grooves 662 on the positioning block 661 are symmetrically distributed about the middle part of the positioning block 661, and the positioning ball 669 fits tightly against the inner wall of the middle part of the positioning block 661. When the middle column 4 vibrates, it drives the limit frame 61 to vibrate normally. At this time, the buffer mechanism 65 is used to flexibly limit the limit frame 61. When the limit frame 61 shakes, it squeezes the limit bar 656. The squeezing of the limit bar 656 drives the limit bar 656 to move toward the fixed bar 651. At this time, the connecting bar 654 rotates in the inner cavity of the buffer seat 653, driving the buffer seat 653 to slide on the fixed rod 652 and squeezing the first spring 655, so that the middle column 4 drives the limit frame 61 to shake between the buffer mechanism 65 when it vibrates. The first spring 655 reduces the shaking amplitude of the limit frame 61 on the inner wall of the lower clamping piece 1 and the upper clamping piece 3 under the buffering of the elastic force of the first spring 655, thereby reducing the vibration amplitude of the middle column 4. When the shaking amplitude of the limit frame 61 is large, the limit frame 61 drives the moving block 663 to move, and the movement of the moving block 663 drives the elastic rod 664 to move, and the movement of the elastic rod 664 drives the positioning ball 669 to roll on the outer surface of the positioning block 661. When the shaking amplitude is too large, the positioning ball 669 and the positioning groove 662 are engaged, so that the positioning block 661 and the moving block 663 remain relatively fixed. At this time, the middle column 4 is temporarily fixed between the lower clamping piece 1 and the upper clamping piece 3. At the same time, under the elastic force of the second spring 665, the first connecting block 666 moves toward the button 667 and presses the button 667.This will cause the speaker 668 to sound an alarm, reminding the staff that the equipment is vibrating significantly and needs timely maintenance, thereby increasing the service life of the equipment.

[0039] See also Figure 4 、 Figure 7 、 Figure 8 and Figure 9As shown, the clamping mechanism 67 includes a second connecting block 671, an inner cavity of the second connecting block 671 is provided with a clamping block 672, both ends of the clamping block 672 are fixedly installed with a first slide rod 673, the outer surface of the first slide rod 673 is sleeved with a third spring 674, the inner cavity of the clamping block 672 is rotatably connected to the second threaded rod 675, the outer surface of the clamping block 672 is slidably connected to the clamping arm 676, the inner wall of the second connecting block 671 is slidably connected to the limit block 677, the outer surface of the limit block 677 is fixedly installed with a gear rod 678, the bottom end of the second connecting block 671 is fixedly installed with a connecting seat 679, the outer surface of the connecting seat 679 is provided with a fourth spring 6710, the second connecting block 671 and the slider 63 are slidably connected, and the clamping block 672 is in close contact with the outer surface of the center column 4. The second connecting block 671 fits with the outer surface of the middle column 4, so that the middle column 4 is limited at the time of the clamping block 672. When the middle column 4 shakes, the clamping block 672 is aligned and fixed flexibly, which can make the middle column 4 produce a buffering effect in the direction of the slider 63, and cooperate with the buffering effect of the buffer mechanism 65 to achieve the flexible connection of the middle column 4 between the lower clamping piece 1 and the upper clamping piece 3, thereby reducing the noise generated during use. The third spring 674 is located between the second connecting block 671 and the clamping block 672, the first sliding rod 673 and the second connecting block 671 are slidably connected, the second threaded rod 675 and the clamping arm 676 are connected by threads, and the thread directions of the two ends of the second threaded rod 675 are opposite, the limiting block 677 is inclined civilized near the corner of the clamping block 672, and is in contact with the clamping block 6 When the second connecting block 671 contacts the second connecting block 672, the limiting block 677 is driven to move away from the second connecting block 671. The fourth spring 6710 is located between the connecting seat 679 and the limiting block 677. The gear rod 678 is in close contact with the outer surface of the second connecting block 671. The outer surface of the limiting block 677 is in contact with the coil 5. The center column 4 is limited by the clamping mechanism 67. The spacing of the slider 63 is adjusted according to the specifications of the center column 4. At the same time, the second threaded rod 675 is rotated to drive the clamping arm 676 to slide in the inner cavity of the clamping block 672, so that the spacing between the clamping arms 676 changes. The adjustment of the spacing of the sliders 63 drives the clamping block 672 to limit the two sides of the center column 4, and the clamping arm 676 limits the other two sides of the center column 4, so that both ends of the center column 4 pass through the clamping block. 672 is fixed with the clamping arm 676 and can be adjusted according to the model of the middle column 4 with a high fault tolerance. At the same time, when the middle column 4 vibrates, the buffer mechanism 65 can buffer in one direction. The middle column 4 shakes in a direction perpendicular to the buffer mechanism 65, driving the clamping block 672 to move in the inner cavity of the second connecting block 671. At this time, the first sliding rod 673 slides in the inner cavity of the second connecting block 671, and the third spring 674 is compressed to reduce the vibration effect of the middle column 4, thereby cooperating with the buffering of the buffer mechanism 65 to reduce the noise of the middle column 4 and the coil 5 during use, and prevent the rigid fixation from fatigue or even breakage during vibration. In addition, during the movement of the clamping block 672, the clamping block 672 squeezes the limit block 677, driving the limit block 677 to move downward to tighten the coil 5.This ensures that the center column 4 and the coil 5 are not offset when they shake. In addition, the center column 4 can be quickly disassembled by rotating the second threaded rod 675 and the first threaded rod 64 during equipment maintenance, thereby improving maintenance efficiency.

[0040] See also Figure 2 、 Figure 10 and Figure 13As shown, the heat dissipation assembly 7 includes a connecting frame 71, the inner cavity of the connecting frame 71 is rotatably connected to a gear 72, a motor 73 is provided in the middle part of the connecting frame 71, the output end of the motor 73 is sleeved with the gear 72, the inner cavity of the connecting frame 71 is slidably connected to a gear rack 74, and heat dissipation mechanisms 75 are provided at both ends of the gear rack 74. A connecting plate 76 is fixedly installed on the outer surface of the gear rack 74, and a protrusion 77 is fixedly installed on the outer surface of the connecting plate 76. There are four protrusions 77, and the middle column 4 and the coil 5 A ventilation mechanism 78 is provided between the connecting frame 71 and the lower surface of the upper clamp 3, a tooth block is provided in the inner cavity of the tooth frame 74, and the tooth block of the tooth frame 74 is engaged with the gear 72, half of the gear 72 is smooth, the connecting plate 76 is slidably connected to the upper clamp 3, the middle column 4 and the coil 5 are four, of which the four middle columns 4 are respectively set as A phase column, B phase column, C phase column and N phase column, the spacing between the middle columns 4 is equal to the spacing between the protrusions 77, the protrusions 77 protrude downward, and the heat dissipation mechanism is provided. Structure 75 is used to dissipate heat from the equipment. Under the operation of motor 73, gear 72 is driven to rotate. The rotation of gear 72 drives rack 74 to move back and forth in the inner cavity of connecting frame 71. The movement of rack 74 drives heat dissipation mechanism 75 to move back and forth, thereby increasing the heat dissipation range of heat dissipation mechanism 75, so that the four middle columns 4 can obtain the effect of uniform heat dissipation, and prevent local temperature from being too high. At the same time, the movement of rack 74 drives connecting plate 76 to move, and the movement of connecting plate 76 drives protrusion 77 to squeeze ventilation mechanism 78, so that ventilation mechanism 78 can ventilate between middle column 4 and coil 5, thereby reducing the temperature of the equipment during use from the inside. In addition, the four middle columns 4 form four passages respectively, including an independent N line passage: the traditional three-phase three-leg inverter has only three middle columns 4, corresponding to the three-phase A, B, and C phase columns. The neutral line current is the vector sum of the three-phase currents and cannot be independently controlled. When the load is unbalanced or there is zero-sequence harmonics, the neutral line current will be very large. Implementation of a three-phase, four-wire, four-leg power conversion topology: The fourth leg is specifically connected to the DC bus midpoint and the neutral point on the AC side of the system. This provides an independently controllable current path for the neutral current. The inverter can actively adjust the output voltage of the fourth leg, precisely controlling the current flowing through the neutral line to offset unbalanced currents or zero-sequence harmonic currents generated by the load. The ultimate goal is to reduce the actual neutral current flowing into the grid to near zero, significantly reducing the burden on the neutral line and the risk of overload. This is essentially a function of the three-phase, four-wire, four-leg power conversion topology. By adding a leg dedicated to neutral / neutral control, the system gains a fourth independent degree of freedom to directly and actively control the neutral current, offsetting imbalances and zero-sequence harmonic components, and protecting the neutral line. Coordinated control of the three phase legs precisely adjusts the amplitude, phase, and waveform of the three-phase output voltage / current, achieving balanced, low-harmonic, and high-power-factor output, even with unbalanced, nonlinear loads. By controlling the current in the fourth leg, the DC bus capacitor current is dynamically balanced, stabilizing the neutral point potential.

[0041] See also Figure 10 and Figure 11 As shown, the heat dissipation mechanism 75 includes a fixed block 751, an inner cavity of the fixed block 751 is provided with a slide groove 752, the inner cavity of the fixed block 751 is provided with a buffer block 753, the outer surface of the buffer block 753 is fixedly installed with a second slide rod 754, the second slide rod 754 and the slide groove 752 are slidably connected, the outer surface of the second slide rod 754 is sleeved with a fifth spring 755, the fifth spring 755 is located between the buffer block 753 and the inner wall of the fixed block 751, the outer surface of the buffer block 753 is provided with a fan 756, the fixed block 75 1 is fixedly connected to the gear rack 74, the fan 756 is located above the limit assembly 6, and the heat dissipation mechanism 75 is used to reduce the noise generated by the fan 756 during heat dissipation. When the fan 756 works, the buffer block 753 is driven to shake, causing the second slide bar 754 to slide in the inner cavity of the slide groove 752 on the fixed block 751, and the elastic force of the fifth spring 755 makes the buffer block 753 always remain in the middle part of the fixed block 751, reducing the vibration generated when the fan 756 works, thereby reducing the noise during ventilation.

[0042] See also Figure 3 and Figure 12 As shown, the ventilation mechanism 78 includes a metal plate 781, and shielding strips 782 are fixedly installed on the inner walls of both ends of the metal plate 781, and a connecting hole 783 is provided on the outer surface of the shielding strip 782. The inner cavity of the metal plate 781 is slidably connected to a heat sink 784, and a ventilation hole 785 is provided on the outer surface of the heat sink 784. Shielding rods 786 are fixedly installed on both ends of the heat sink 784, and an extrusion rod 787 is fixedly installed on the middle part of the heat sink 784. The outer surface of the extrusion rod 787 is sleeved with a sixth spring 788, and the extrusion rod 787 is slidably connected to the shielding strip 782. The sixth spring 788 is located between the heat sink 784 and the shielding strip 782, and the shielding rod 786 is slidably connected to the connecting hole 783. The shielding rod 786 and the connecting hole 783 are disengaged, and the metal plate 781 is in position Between the middle column 4 and the coil 5, the top end of the extrusion rod 787 is located on the lower surface of the connecting plate 76, and when the connecting plate 76 moves, the protrusion 77 squeezes the top end of the extrusion rod 787. When the heat dissipation mechanism 75 moves back and forth, the protrusion 77 squeezes the extrusion rod 787. At this time, the extrusion rod 787 drives the heat dissipation plate 784 to slide in the inner cavity of the metal plate 781. At the same time, the shielding rod 786 and the connecting hole 783 are disengaged. The air flow generated by the fan 756 can enter between the metal plate 781 and the second sliding rod 754 from the inner cavity of the connecting hole 783, and is transmitted to between the middle column 4 and the coil 5 through the ventilation hole 785, thereby improving the heat dissipation effect of the middle column 4 and the coil 5 during use, and preventing poor heat dissipation from causing the temperature of the reactor to continue to rise and affecting the use efficiency of the reactor.

[0043] In summary, the connecting rod 2 is used to connect the lower clamp 1 and the upper clamp 3, the limiting assembly 6 limits the middle column 4 so that it is flexibly installed between the lower clamp 1 and the upper clamp 3, the heat dissipation assembly 7 is used to uniformly dissipate heat to the middle column 4 and the coil 5, and realize internal ventilation of the middle column 4 and the coil 5. By rotating the first threaded rod 64, the slider 63 is driven to move on the limiting rod 62, so that the distance between the sliders 63 changes, which is convenient for controlling the distance of the clamping mechanism 67, so that the clamping mechanism 67 can flexibly fix the middle column 4 according to the specifications of the middle column 4, the buffer mechanism 65 is used to flexibly limit the limit frame 61, and the positioning mechanism 66 is used to position the limit frame 61 and issue an alarm when the limit frame 61 produces a large shake. Remind the staff to maintain the equipment and improve the service life of the equipment. The heat dissipation mechanism 75 is used to dissipate heat from the equipment. Under the operation of the motor 73, the gear 72 is driven to rotate. The rotation of the gear 72 drives the gear rack 74 to move back and forth in the inner cavity of the connecting frame 71. The movement of the gear rack 74 drives the heat dissipation mechanism 75 to move back and forth, thereby increasing the heat dissipation range of the heat dissipation mechanism 75, so that the four middle columns 4 can obtain the effect of uniform heat dissipation to prevent local temperature from being too high. At the same time, the movement of the gear rack 74 drives the connecting plate 76 to move, and the movement of the connecting plate 76 drives the protrusion 77 to squeeze the ventilation mechanism 78, so that the ventilation mechanism 78 can ventilate between the middle column 4 and the coil 5, thereby reducing the temperature of the equipment from the inside during use.

[0044] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

[0045] The above is only a preferred specific implementation method for implementing this application, but the scope of protection of this application is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed in this application, who makes equivalent replacements or changes based on the technical solution and its conception of this application, should be covered by the scope of protection of this application.

Claims

1. A four-phase four-column reactor for a power electronic device, comprising a lower clamp (1), a connecting rod (2) and an upper clamp (3), characterized in that: A connecting rod (2) is fixedly mounted on the outer surface of the lower clamp (1), and an end of the connecting rod (2) away from the lower clamp (1) is fixedly connected to the upper clamp (3), a middle column (4) is provided between the lower clamp (1) and the upper clamp (3), a coil (5) is sleeved on the outer surface of the middle column (4), and limiting components (6) are provided at both ends of the middle column (4), and the limiting components (6) are respectively located on the inner walls of the lower clamp (1) and the upper clamp (3), and a heat dissipation component (7) is provided below the top arm of the upper clamp (3); The limit assembly (6) includes a limit frame (61), a limit rod (62) is fixedly installed on the inner wall of the limit frame (61), a slider (63) is slidably connected to the outer surface of the limit rod (62), and the inner cavity of the limit frame (61) is rotatably connected to the first threaded rod (64). Buffer mechanisms (65) are provided on both sides of the limit frame (61), a positioning mechanism (66) is provided on the middle inner wall of the limit frame (61), and a clamping mechanism (67) is provided on the lower surface of the slider (63). The slider (63) and the first threaded rod (64) are connected by threads, and the threads at both ends of the first threaded rod (64) are in opposite directions.

2. A four-phase four-column reactor for a power electronic device according to claim 1, characterized in that: The buffer mechanism (65) includes a fixing bar (651), a fixing rod (652) is fixedly installed on the inner wall of the fixing bar (651), the outer surface of the fixing rod (652) is slidably connected to the buffer seat (653), the inner cavity of the buffer seat (653) is rotatably connected to the connecting bar (654), the middle part of the fixing bar (652) is provided with a first spring (655), the end of the connecting bar (654) away from the buffer seat (653) is rotatably connected to the limiting bar (656), the lower clamp (1) and the upper clamp (3) are both fixedly connected to the fixing bar (651), the two ends of the first spring (655) are in contact with the buffer seat (653), and the limiting bar (656) is in close contact with the outer surface of the limiting frame (61).

3. A four-phase four-column reactor for a power electronic device according to claim 1, characterized in that: The positioning mechanism (66) includes a positioning block (661), a positioning groove (662) is provided on the outer surface of the positioning block (661), a moving block (663) is fixedly installed in the middle part of the limit frame (61), an elastic rod (664) is slidably connected to the inner cavity of the moving block (663), a second spring (665) is sleeved on one end of the elastic rod (664), a first connecting block (666) is fixedly installed on the outer surface of the elastic rod (664), a button (667) is provided on the outer surface of the moving block (663), a speaker (668) is fixedly installed on the outer surface of the moving block (663), and a positioning ball (669) is rollingly connected to one end of the elastic rod (664) close to the positioning block (661).

4. A four-phase four-column reactor for a power electronic device according to claim 3, characterized in that: The second spring (665) is located between the first connecting block (666) and the inner wall of the moving block (663), the first connecting block (666) and the moving block (663) are slidably connected, the button (667) and the speaker (668) are electrically connected, and pressing the button (667) controls the speaker (668) to sound an alarm, the lower clamp (1) and the upper clamp (3) are both fixedly connected to the positioning block (661), the two positioning grooves (662) on the positioning block (661) are symmetrically distributed about the middle part of the positioning block (661), and the positioning ball (669) is tightly fitted with the inner wall of the middle part of the positioning block (661).

5. A four-phase four-column reactor for a power electronic device according to claim 1, characterized in that: The clamping mechanism (67) includes a second connecting block (671), an inner cavity of the second connecting block (671) is provided with a clamping block (672), both ends of the clamping block (672) are fixedly installed with a first slide rod (673), the outer surface of the first slide rod (673) is sleeved with a third spring (674), the inner cavity of the clamping block (672) is rotatably connected to a second threaded rod (675), the outer surface of the clamping block (672) is slidably connected to a clamping arm (676), the inner wall of the second connecting block (671) is slidably connected to a limit block (677), the outer surface of the limit block (677) is fixedly installed with a gear rod (678), the bottom end of the second connecting block (671) is fixedly installed with a connecting seat (679), and the outer surface of the connecting seat (679) is provided with a fourth spring (6710).

6. A four-phase four-column reactor for a power electronic device according to claim 5, characterized in that: The second connecting block (671) and the slider (63) are slidably connected, the clamping block (672) and the outer surface of the center column (4) are in close contact, the second connecting block (671) and the outer surface of the center column (4) are in contact, the third spring (674) is located between the second connecting block (671) and the clamping block (672), the first sliding rod (673) and the second connecting block (671) are slidably connected, the second threaded rod (675) and the clamping arm (676) are connected by threads, and the second threaded rod ( 675) have opposite thread directions at both ends, the limit block (677) is inclined near the corner of the clamping block (672), and when in contact with the clamping block (672), it drives the limit block (677) to move away from the second connecting block (671), the fourth spring (6710) is located between the connecting seat (679) and the limit block (677), the shift rod (678) is in close contact with the outer surface of the second connecting block (671), and the outer surface of the limit block (677) is in contact with the coil (5).

7. A four-phase four-column reactor for a power electronic device according to claim 1, characterized in that: The heat dissipation assembly (7) includes a connecting frame (71), the inner cavity of the connecting frame (71) is rotatably connected to a gear (72), a motor (73) is provided in the middle portion of the connecting frame (71), the output end of the motor (73) is sleeved with the gear (72), the inner cavity of the connecting frame (71) is slidably connected to a gear rack (74), both ends of the gear rack (74) are provided with heat dissipation mechanisms (75), a connecting plate (76) is fixedly installed on the outer surface of the gear rack (74), and a protrusion (77) is fixedly installed on the outer surface of the connecting plate (76), and there are four protrusions (77). The center column (4 ) and the coil (5) are provided with a ventilation mechanism (78), the connecting frame (71) and the lower surface of the upper clamp (3) are fixedly connected, the inner cavity of the tooth frame (74) is provided with a tooth block, and the tooth block of the tooth frame (74) is engaged with the gear (72), half of the gear (72) is smooth, the connecting plate (76) and the upper clamp (3) are slidably connected, the middle column (4) and the coil (5) are both four, wherein the four middle columns (4) are respectively set as A phase column, B phase column, C phase column and N phase column, the spacing between the middle columns (4) is equal to the spacing between the protrusions (77), and the protrusions (77) protrude downward.

8. A four-phase four-column reactor for a power electronic device according to claim 7, characterized in that: The heat dissipation mechanism (75) includes a fixed block (751), an inner cavity of the fixed block (751) is provided with a slide groove (752), an inner cavity of the fixed block (751) is provided with a buffer block (753), an outer surface of the buffer block (753) is fixedly mounted with a second slide bar (754), the second slide bar (754) and the slide groove (752) are slidably connected, the outer surface of the second slide bar (754) is sleeved with a fifth spring (755), the fifth spring (755) is located between the buffer block (753) and the inner wall of the fixed block (751), a fan (756) is provided on the outer surface of the buffer block (753), the fixed block (751) and the gear rack (74) are fixedly connected, and the fan (756) is located above the limiting component (6).

9. A four-phase four-column reactor for a power electronic device according to claim 7, characterized in that: The ventilation mechanism (78) includes a metal plate (781), shielding strips (782) are fixedly installed on the inner walls at both ends of the metal plate (781), a connecting hole (783) is provided on the outer surface of the shielding strip (782), a heat sink (784) is slidably connected to the inner cavity of the metal plate (781), a ventilation hole (785) is provided on the outer surface of the heat sink (784), shielding rods (786) are fixedly installed on both ends of the heat sink (784), an extrusion rod (787) is fixedly installed on the middle part of the heat sink (784), and a sixth spring (788) is sleeved on the outer surface of the extrusion rod (787).

10. A four-phase four-column reactor for a power electronic device according to claim 9, characterized in that: The extrusion rod (787) and the shielding bar (782) are slidably connected, the sixth spring (788) is located between the heat dissipation plate (784) and the shielding bar (782), the shielding rod (786) and the connecting hole (783) are slidably connected, the shielding rod (786) and the connecting hole (783) are disengaged, the metal plate (781) is located between the center column (4) and the coil (5), the top end of the extrusion rod (787) is located on the lower surface of the connecting plate (76), and when the connecting plate (76) moves, the protrusion (77) squeezes the top end of the extrusion rod (787).

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