Four-phase four-column reactor for power electronic device

Abstract

The application relates to the electric power electronic technical field, and particularly discloses a four-phase four-column type electric reactor for electric power electronics, which comprises a lower clamp, a connecting rod and an upper clamp, the outer surface of the lower clamp is fixedly installed with the connecting rod, the end, away from the lower clamp, of the connecting rod is fixedly connected with the upper clamp, and a middle column is arranged between the lower clamp and the upper clamp. The four-phase four-column type electric reactor can flexibly fix the middle column and the coil through the limiting assembly, has certain buffering effect on vibration of the equipment, reduces noise generated when the equipment vibrates, can position the middle column when large shaking is generated, prevents the equipment from being damaged due to long-time large shaking, and sends an alarm to remind the staff to timely maintain, can uniformly radiate heat of the equipment through the heat dissipation assembly, makes the temperature of the multiple middle columns and the coil relatively uniform, prevents aging of insulation materials, can transport airflow to the middle column and the coil when accelerating and flowing, thereby better radiating heat, and is convenient for prolonging the service life of the electric reactor.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a four-phase four-column reactor for power electronic devices. Background Technology

[0002] With the rapid development of power electronics, large-scale power electronic equipment is being used more and more widely in various industries, with increasingly higher power levels and stricter restrictions on equipment size. Magnetic components are one of the most important parts of power electronic equipment, largely determining the overall performance, efficiency, and size of the device. For applications involving three-phase unbalanced loads and high voltage quality, the circuit is designed as a three-phase four-wire system. Specifically, this involves a three-phase four-wire four-bridge circuit topology, conventionally using four single-phase reactors. Four reactors are not only expensive but also occupy a large amount of space.

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

[0004] 1. During operation, the changes in the magnetic field of a traditional reactor cause it to vibrate. Since reactors are mostly fixed with bolts, long-term vibration can cause the bolts to loosen, resulting in insufficient tightness between components. As a result, the coil vibration generates noise when the reactor is running. The fixed connection cannot absorb or 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 disassembling a large number of connecting parts, which consumes a lot of time and manpower.

[0005] 2. Existing reactors have poor heat dissipation efficiency. The fans are all fixedly connected to the reactor. The fixed fans can only dissipate heat to specific areas of the reactor, resulting in large temperature differences between different parts of the reactor. The parts closer to the fan have good heat dissipation and lower temperature, while the parts farther away from the fan have insufficient heat dissipation and higher temperature. Under long-term operation, the high temperature area may accelerate the aging of the insulation material, reduce the service life of the reactor, and even cause failures such as insulation breakdown. In addition, the connection between the coil and the neutral column is tight, and the heat generated during operation is high, which cannot be cooled by aligning metal sheets. Summary of the Invention

[0006] To overcome the vibration caused by changes in the magnetic field in reactors, which are often fixed with bolts, long-term vibration can cause the bolts to loosen, resulting in insufficient tightness between components. This leads to noise generated by coil vibration during reactor operation. Fixed connections cannot absorb or reduce vibration, resulting in high noise levels. Furthermore, when reactors need replacement or repair, fixed connections typically require disassembling numerous connecting parts, consuming significant time and manpower. Reactors also have poor heat dissipation efficiency; fans are fixedly mounted on the reactor, meaning they can only cool specific areas, leading to significant temperature differences between different parts. Areas closer to the fan have better cooling and lower temperatures, while areas further away suffer from insufficient cooling and higher temperatures. Over time, these high-temperature areas may accelerate the aging of insulation materials, reducing the reactor's lifespan and even causing insulation breakdown. The purpose of this invention is to provide a four-phase, four-column reactor for power electronic devices to address these shortcomings.

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

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

[0009] Furthermore, the positioning mechanism includes a positioning block, a positioning groove is provided on the outer surface of the positioning block, a movable block is fixedly installed in the middle part of the limiting frame, a spring rod is slidably connected to the inner cavity of the movable block, a second spring is sleeved on one end of the spring rod, a first connecting block is fixedly installed on the outer surface of the spring rod, a button is provided on the outer surface of the movable block, a horn is fixedly installed on the outer surface of the movable block, and a positioning ball is rotatably connected to the end of the spring rod near the positioning block.

[0010] Furthermore, the second spring is located between the inner walls of the first connecting block and the moving block. The first connecting block and the moving block are slidably connected. The button and the horn are electrically connected. Pressing the button controls the horn to emit an alarm. The lower clamp and the upper clamp are both fixedly connected to positioning blocks. The two positioning grooves on the positioning blocks are symmetrically distributed about the middle part of the positioning blocks. 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, a clamping block is provided in the inner cavity of the second connecting block, a first sliding rod is fixedly installed at both ends of the clamping block, a third spring is sleeved on the outer surface of the first sliding rod, a second threaded rod is rotatably connected to the inner cavity of the clamping block, a clamping arm is slidably connected to the outer surface of the clamping block, a limit block is slidably connected to the inner wall of the second connecting block, a stop bar is fixedly installed on the outer surface of the limit block, a connecting seat is fixedly installed at the bottom end of the second connecting block, and a fourth spring is provided on the outer surface of the connecting seat.

[0012] Furthermore, the second connecting block and the slider are slidably connected, the outer surfaces of the clamping block and the central column are in close contact, the outer surfaces of the second connecting block and the central column are in contact, 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 connected by threads, and the threads at both ends of the second threaded rod are in opposite directions, the outer surface of the limiting block near the corner of the clamping block is inclined, and when it contacts the clamping block, it drives the limiting block to move away from the second connecting block, the fourth spring is located between the connecting seat and the limiting block, the outer surfaces of the stop rod and the second connecting block are in close contact, and the outer surface of the limiting block contacts the coil.

[0013] Furthermore, the heat dissipation assembly includes a connecting frame, a gear rotatably connected to the inner cavity of the connecting frame, a motor located in the middle of the connecting frame, the output end of the motor being sleeved with the gear, a gear frame slidably connected to the inner cavity of the connecting frame, heat dissipation mechanisms located at both ends of the gear frame, a connecting plate fixedly mounted on the outer surface of the gear frame, four protrusions fixedly mounted on the outer surface of the connecting plate, a ventilation mechanism located between the central column and the coil, the lower surface of the connecting frame and the upper clamping member being fixedly connected, tooth blocks located in the inner cavity of the gear frame, and the tooth blocks of the gear frame meshing with the gear, half of the gear being smooth, the connecting plate and the upper clamping member being slidably connected, there are four central columns and four coils, the four central columns being designated as phase A, phase B, phase C, and phase N respectively, the spacing between the central columns being equal to the spacing between the protrusions, and the protrusions protruding downwards.

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

[0015] Furthermore, the ventilation mechanism includes a metal plate, with baffle strips fixedly installed on the inner walls of both ends of the metal plate, and connecting holes opened on the outer surface of the baffle strips. A heat dissipation plate is slidably connected to the inner cavity of the metal plate, and ventilation holes are opened on the outer surface of the heat dissipation plate. Baffle rods are fixedly installed on both ends of the heat dissipation plate, and a pressing rod is fixedly installed in the middle part of the heat dissipation plate. A sixth spring is sleeved on the outer surface of the pressing rod.

[0016] Furthermore, the extrusion rod and the shielding strip are slidably connected, the sixth spring is located between the heat sink 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 central column and the coil, the top of the extrusion rod is located on the lower surface of the connecting plate, and when the connecting plate moves, the protrusion extrudes the top of the extrusion rod.

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

[0018] 1. By employing a limiting component, this invention effectively solves the problem of vibration caused by changes in the magnetic field during operation of traditional reactors. Reactors are typically fixed with bolts, which can loosen over time due to vibration, leading to insufficient connection between components. This results in noise generated by coil vibration during reactor operation. Fixed connections cannot absorb or reduce vibration, resulting in high noise levels. Furthermore, when the reactor needs replacement or repair, fixed connections usually require disassembling numerous connecting parts, consuming significant time and manpower. This invention, through the limiting component, flexibly fixes the central column and coil, providing a buffering effect during vibration and reducing noise. It also positions the central column during significant shaking to prevent damage from prolonged shaking and issues an alarm to remind staff to perform timely maintenance. Additionally, the reactor is easy to disassemble for maintenance, improving maintenance efficiency.

[0019] 2. By employing a heat dissipation component, the poor heat dissipation efficiency of existing reactors is effectively solved. Previously, fans were fixedly connected to the reactor, allowing only specific areas to dissipate heat. This resulted in significant temperature differences between different parts of the reactor; areas near the fan experienced better heat dissipation and lower temperatures, while areas further away suffered from insufficient heat dissipation and higher temperatures. Over long-term operation, these high-temperature areas could accelerate the aging of insulation materials, reducing the reactor's lifespan and even causing insulation breakdown. Furthermore, the tight connection between the coil and the intermediate column generated significant heat during operation, making it impossible to cool using metal plates. This invention, through its heat dissipation component, provides uniform heat dissipation, ensuring relatively uniform temperatures across multiple intermediate columns and coils, preventing insulation aging. During accelerated flow, the component also directs airflow between the intermediate columns and coils, resulting in better heat dissipation and extending the reactor's lifespan. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the central column structure in an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the limiting component structure in the embodiments of this application;

[0023] Figure 4 This is a schematic diagram of the limiting frame structure in the embodiments of this application;

[0024] Figure 5 This is a schematic diagram of the buffer mechanism structure in the embodiments of this application;

[0025] Figure 6 This is a schematic cross-sectional view of the positioning mechanism structure in the embodiments of this application;

[0026] Figure 7 This is a schematic diagram of the clamping mechanism structure in the embodiments of this application;

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

[0028] Figure 9 Examples of this application Figure 8 Enlarged structural diagram at point A;

[0029] Figure 10 This is a schematic diagram of the heat dissipation component structure in an embodiment of this application;

[0030] Figure 11 This is a schematic diagram of the heat dissipation mechanism structure in the embodiments of this application;

[0031] Figure 12 This is a partial structural diagram of the ventilation mechanism in an embodiment of this application;

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

[0033] In the diagram: 1. Lower clamp; 2. Connecting rod; 3. Upper clamp; 4. Central column; 5. Coil; 6. Limiting assembly; 61. Limiting frame; 62. Limiting rod; 63. Slider; 64. First threaded rod; 65. Buffer mechanism; 651. Fixing strip; 652. Fixing rod; 653. Buffer seat; 654. Connecting strip; 655. First spring; 656. Limiting strip; 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. Horn; 669. Positioning ball; 67. Clamping mechanism; 671. Second connecting block; 672. Clamping block; 673. First 674. Slide rod; 675. Third spring; 676. Second threaded rod; 677. Clamping arm; 678. Limiting block; 679. Stop bar; 6710. Connecting seat; 672. Fourth spring; 7. Heat dissipation assembly; 71. Connecting frame; 72. Gear; 73. Motor; 74. Gear frame; 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. Pressing rod; 788. Sixth spring. Detailed Implementation

[0034] To address the issue of bolts loosening due to prolonged vibration, this invention uses a limiting component to flexibly fix the central column and coil, providing a buffering effect during vibration and reducing noise generated during vibration. Furthermore, to address the issue of fixed-position fans only dissipating heat to specific areas of the reactor, this invention uses a heat dissipation component to provide uniform heat dissipation, ensuring relatively uniform temperatures across multiple central columns and coils and preventing aging of the insulation material.

[0035] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0036] Example: Please refer to Figure 1 and Figure 2As shown, a four-phase four-column reactor for power electronic devices 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. 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 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. Limiting components 6 are provided at both ends of the middle column 4. The limiting components 6 are located on the inner walls of the lower clamp 1 and the upper clamp 3, respectively. A heat dissipation component 7 is provided below 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 components 6 limit 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 from the middle column 4 and the coil 5, and to achieve ventilation inside the middle column 4 and the coil 5.

[0037] Please see Figure 2 and Figure 4 As shown, the limiting component 6 includes a limiting frame 61. A limiting rod 62 is fixedly installed on the inner wall of the limiting frame 61. A slider 63 is slidably connected to the outer surface of the limiting rod 62. A first threaded rod 64 is rotatably connected to the inner cavity of the limiting frame 61. Buffer mechanisms 65 are provided on both sides of the limiting frame 61. A positioning mechanism 66 is provided on the middle inner wall of the limiting frame 61. 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. By rotating the first threaded rod 64, the slider 63 moves on the limiting rod 62, causing the distance between the sliders 63 to change. This facilitates the control of the spacing of the clamping mechanism 67, allowing the clamping mechanism 67 to flexibly fix the central column 4 according to its specifications. The buffer mechanism 65 is used to flexibly limit the limiting frame 61. The positioning mechanism 66 is used to position the limiting frame 61 and issue an alarm when the limiting frame 61 experiences significant shaking, reminding staff to maintain the equipment and improving its service life.

[0038] Please see Figure 4 , Figure 5 and Figure 6As shown, the buffer mechanism 65 includes a fixing bar 651, a fixing rod 652 fixedly installed on the inner wall of the fixing bar 651, a buffer seat 653 slidably connected to the outer surface of the fixing rod 652, a connecting bar 654 rotatably connected to the inner cavity of the buffer seat 653, a first spring 655 provided in the middle part of the fixing rod 652, a limit bar 656 rotatably connected to the end of the connecting bar 654 away from the buffer seat 653, fixing bars 651 fixedly connected to both the lower clamp 1 and the upper clamp 3, the two ends of the first spring 655 fitting against the buffer seat 653, and the limit bar 656 in close contact with the outer surface of the limit frame 61. The positioning mechanism 66 includes a positioning block 661, a positioning groove 662 opened on the outer surface of the positioning block 661, and a moving part fixedly installed in the middle part of the limit frame 61. The movable block 663 has a spring rod 664 slidably connected to its inner cavity. A second spring 665 is sleeved on one end of the spring rod 664. A first connecting block 666 is fixedly installed on the outer surface of the spring rod 664. A button 667 and a horn 668 are fixedly installed on the outer surface of the movable block 663. A positioning ball 669 is slidably connected to one end of the spring rod 664 near the positioning block 661. The second spring 665 is located between the inner walls of the first connecting block 666 and the movable block 663. The first connecting block 666 and the movable block 663 are slidably connected. The button 667 and the horn 668 are electrically connected. Pressing the button 667 controls the horn 668 to sound an alarm. Positioning blocks 661 are fixedly connected to both the lower clamp 1 and the upper clamp 3. The two positioning grooves 662 on the positioning block 661 are symmetrically distributed about the middle part of the positioning block 661. The positioning ball 669 is tightly fitted to the inner wall of the middle part of the positioning block 661. When the central column 4 vibrates, it drives the limiting frame 61 to vibrate normally. At this time, the buffer mechanism 65 is used to flexibly limit the limiting frame 61. When the limiting frame 61 shakes, it will squeeze the limiting strip 656. The squeezing of the limiting strip 656 will drive the limiting strip 656 to move towards the fixed strip 651. At this time, the connecting strip 654 rotates in the inner cavity of the buffer seat 653, causing the buffer seat 653 to slide on the fixed rod 652 and squeeze the first spring 655. Thus, when the central column 4 vibrates, it drives the limiting frame 61 to shake between the buffer mechanisms 65. The first spring 655 reduces the swaying amplitude of the limiting frame 61 on the inner walls of the lower clamp 1 and the upper clamp 3 under the buffering force, thereby reducing the vibration amplitude of the central column 4. When the swaying amplitude of the limiting frame 61 is large, the limiting frame 61 drives the moving block 663 to move. The movement of the moving block 663 drives the spring rod 664 to move. The movement of the spring rod 664 drives the positioning ball 669 to roll on the outer surface of the positioning block 661. When the swaying amplitude is too large, the positioning ball 669 engages with the positioning groove 662, thereby keeping the positioning block 661 and the moving block 663 relatively fixed. At this time, the central column 4 is temporarily fixed between the lower clamp 1 and the upper clamp 3. At the same time, under the elastic force of the second spring 665, the first connecting block 666 moves towards the button 667 and presses the button 667.This triggers the horn 668 to sound an alarm, alerting staff that the equipment is experiencing significant vibration and requires timely maintenance, thereby extending the equipment's lifespan.

[0039] Please see Figure 4 , Figure 7 , Figure 8 and Figure 9As shown, the clamping mechanism 67 includes a second connecting block 671. A clamping block 672 is provided within the inner cavity of the second connecting block 671. First sliding rods 673 are fixedly installed at both ends of the clamping block 672. A third spring 674 is sleeved on the outer surface of the first sliding rods 673. A second threaded rod 675 is rotatably connected to the inner cavity of the clamping block 672. A clamping arm 676 is slidably connected to the outer surface of the clamping block 672. A limit block 677 is slidably connected to the inner wall of the second connecting block 671. A stop bar 678 is fixedly installed on the outer surface of the limit block 677. A connecting seat 679 is fixedly installed at the bottom end of the second connecting block 671. A fourth spring 6710 is provided on the outer surface of the connecting seat 679. 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 central column 4. The second connecting block 671 and the outer surface of the central column 4 are in contact, thus limiting the central column 4 when the clamping block 672 is in place. When the central column 4 shakes, the clamping block 672 is flexibly fixed, which can generate a buffering effect on the central column 4 in the direction of the slider 63. Combined with the buffering effect of the buffering mechanism 65, the central column 4 is flexibly connected between the lower clamping member 1 and the upper clamping member 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 at both ends of the second threaded rod 675 are opposite. The outer surface of the limiting block 677 near the corner of the clamping block 672 is inclined, and it is in contact with the clamping block 672. When contact occurs at point 72, the limiting block 677 moves away from the second connecting block 671. The fourth spring 6710 is located between the connecting seat 679 and the limiting block 677. The stop lever 678 and the outer surface of the second connecting block 671 are in close contact. The outer surface of the limiting block 677 is in contact with the coil 5. The clamping mechanism 67 limits the center column 4. The spacing of the sliders 63 is adjusted according to the specifications of the center column 4. At the same time, by rotating the second threaded rod 675, the clamping arms 676 slide in the inner cavity of the clamping block 672, thereby changing the spacing between the clamping arms 676. The adjustment of the spacing of the sliders 63 causes the clamping block 672 to limit the two sides of the center column 4. The clamping arms 676 limit the other two sides of the center column 4, so that both ends of the center column 4 are clamped. The clamping arm 672 and clamping arm 676 are fixed together and can be adjusted according to the model of the central column 4, with a high fault tolerance. At the same time, when the central column 4 vibrates, the buffering mechanism 65 can buffer in one direction. In the direction perpendicular to the buffering mechanism 65, the central column 4 shakes, causing 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 central column 4. Thus, in conjunction with the buffering mechanism 65, the noise of the central column 4 and coil 5 during use can be reduced, and the rigid fixation can be prevented from structural fatigue or even breakage during vibration. In addition, during the movement of the clamping block 672, the clamping block 672 squeezes the limiting block 677, causing the limiting block 677 to move down and tighten the coil 5.This ensures that misalignment between the central column 4 and coil 5 is avoided when they wobble. Furthermore, during equipment maintenance, the central column 4 can be quickly disassembled by rotating the second threaded rod 675 and the first threaded rod 64, improving maintenance efficiency.

[0040] Please see Figure 2 , Figure 10 and Figure 13As shown, the heat dissipation assembly 7 includes a connecting frame 71, a gear 72 rotatably connected to the inner cavity of the connecting frame 71, a motor 73 disposed in the middle of the connecting frame 71, the output end of the motor 73 being sleeved with the gear 72, a gear frame 74 slidably connected to the inner cavity of the connecting frame 71, heat dissipation mechanisms 75 disposed at both ends of the gear frame 74, a connecting plate 76 fixedly mounted on the outer surface of the gear frame 74, and four protrusions 77 fixedly mounted on the outer surface of the connecting plate 76, the central column 4 and the coil 5. A ventilation mechanism 78 is provided between them. The connecting frame 71 and the lower surface of the upper clamp 3 are fixedly connected. The inner cavity of the gear frame 74 is provided with tooth blocks, and the tooth blocks of the gear frame 74 mesh with the gear 72. Half of the gear 72 is smooth. The connecting plate 76 and the upper clamp 3 are slidably connected. There are four central columns 4 and four coils 5. The four central columns 4 are respectively designated as A-phase column, B-phase column, C-phase column and N-phase column. The spacing between the central columns 4 is equal to the spacing between the protrusions 77. The protrusions 77 protrude downwards. The structure 75 is used for heat dissipation of 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 frame 74 to reciprocate within the cavity of the connecting frame 71. The movement of the gear frame 74 drives the heat dissipation mechanism 75 to reciprocate, thereby increasing the heat dissipation range of the heat dissipation mechanism 75 and enabling the four central columns 4 to achieve uniform heat dissipation, preventing local overheating. At the same time, the movement of the gear frame 74 drives the connecting plate 76 to move. The movement of the connecting plate 76 causes the protrusion 77 to squeeze the ventilation mechanism 78, enabling the ventilation mechanism 78 to ventilate between the central columns 4 and the coil 5, thereby reducing the temperature of the equipment during use from the inside. In addition, the four central columns 4 form four paths, including an independent N-line path: Traditional three-phase three-bridge arm inverters only have three central 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 are zero-sequence harmonics, the neutral line current will be very large. The implementation of a three-phase four-wire four-arm system: The fourth arm is specifically connected to the DC bus neutral point and the neutral point on the AC side of the system. This provides an independent and controllable current path for the neutral line current. The inverter can actively adjust the output voltage of the fourth arm to precisely control the current flowing through the neutral line, enabling it to offset unbalanced currents or zero-sequence harmonic currents generated by the load. The ultimate goal is to make the actual neutral line current flowing into the grid close to zero, significantly reducing the burden on the neutral line and the risk of overload. Essentially, this is a benefit of the three-phase four-wire four-arm power conversion topology. By adding a dedicated arm for neutral / neutral point control, the system gains a fourth independent degree of control freedom to directly and actively control the neutral line current, offsetting unbalanced and zero-sequence harmonic components, and protecting the neutral line. It also coordinates the control of the three phase arms to precisely adjust the amplitude, phase, and waveform of the three-phase output voltage / current, achieving balanced, low-harmonic, and high-power-factor output, even under unbalanced nonlinear loads. By controlling the current of the fourth arm, it dynamically balances the DC bus capacitor current and stabilizes the neutral point potential.

[0041] Please see Figure 10 and Figure 11 As shown, the heat dissipation mechanism 75 includes a fixed block 751, an inner cavity of which has a sliding groove 752, a buffer block 753, and a second sliding rod 754 fixedly mounted on the outer surface of the buffer block 753. The second sliding rod 754 is slidably connected to the sliding groove 752, and a fifth spring 755 is sleeved on the outer surface of the second sliding rod 754. The fifth spring 755 is located between the inner wall of the buffer block 753 and the fixed block 751. A fan 756 is provided on the outer surface of the buffer block 753. 1 is fixedly connected to the gear frame 74. The fan 756 is located above the limiting component 6. The heat dissipation mechanism 75 is used to reduce the noise generated by the fan 756 during heat dissipation. When the fan 756 works, it causes the buffer block 753 to shake, causing the second slide rod 754 to slide in the inner cavity of the slide groove 752 on the fixed block 751. The elastic force of the fifth spring 755 keeps the buffer block 753 in the middle of the fixed block 751, reducing the vibration generated by the fan 756 during operation, thereby reducing noise during ventilation.

[0042] Please see Figure 3 and Figure 12 As shown, the ventilation mechanism 78 includes a metal plate 781. Baffle strips 782 are fixedly installed on the inner walls of both ends of the metal plate 781. A connecting hole 783 is formed on the outer surface of the baffle strips 782. A heat dissipation plate 784 is slidably connected to the inner cavity of the metal plate 781. Ventilation holes 785 are formed on the outer surface of the heat dissipation plate 784. Baffle rods 786 are fixedly installed on both ends of the heat dissipation plate 784. A pressing rod 787 is fixedly installed in the middle of the heat dissipation plate 784. A sixth spring 788 is sleeved on the outer surface of the pressing rod 787. The pressing rod 787 and the baffle strips 782 are slidably connected. The sixth spring 788 is located between the heat dissipation plate 784 and the baffle strips 782. The baffle rod 786 and the connecting hole 783 are slidably connected. The baffle rod 786 and the connecting hole 783 are disengaged. The metal plate 781 is positioned... Between the central column 4 and the coil 5, the top of the pressing rod 787 is located on the lower surface of the connecting plate 76. When the connecting plate 76 moves, the protrusion 77 presses against the top of the pressing rod 787. When the heat dissipation mechanism 75 moves back and forth, the protrusion 77 presses against the pressing rod 787. At this time, the pressing 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 disengage. The airflow generated by the fan 756 can enter the space between the metal plate 781 and the second slide rod 754 from the inner cavity of the connecting hole 783, and be transmitted to the space between the central column 4 and the coil 5 through the ventilation hole 785. This improves the heat dissipation effect of the central column 4 and the coil 5 during use and prevents the reactor temperature from rising continuously due to poor heat dissipation, thus affecting the efficiency of the reactor.

[0043] In summary, the connecting rod 2 connects the lower clamp 1 and the upper clamp 3; the limiting component 6 limits the center column 4, allowing it to be flexibly installed between the lower clamp 1 and the upper clamp 3; the heat dissipation component 7 provides uniform heat dissipation for the center column 4 and the coil 5, and enables ventilation inside the center column 4 and the coil 5; rotating the first threaded rod 64 moves the slider 63 on the limiting rod 62, changing the distance between the sliders 63, which facilitates control of the spacing of the clamping mechanism 67, allowing the clamping mechanism 67 to flexibly fix the center column 4 according to its specifications; the buffer mechanism 65 flexibly limits the limiting frame 61; and the positioning mechanism 66 positions the limiting frame 61 and issues an alarm when it experiences significant shaking. The staff is reminded to maintain the equipment to extend its service life. 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 frame 74 to move back and forth in the inner cavity of the connecting frame 71. The movement of the gear frame 74 drives the heat dissipation mechanism 75 to move back and forth, thereby increasing the heat dissipation range of the heat dissipation mechanism 75 and enabling the four central columns 4 to achieve a uniform heat dissipation effect, preventing local overheating. At the same time, the movement of the gear frame 74 drives the connecting plate 76 to move. The movement of the connecting plate 76 causes the protrusion 77 to squeeze the ventilation mechanism 78, so that the ventilation mechanism 78 can ventilate between the central 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 can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0045] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A four-phase four-column reactor for power electronic devices, comprising a lower clamp (1), a connecting rod (2), and an upper clamp (3), characterized in that, A connecting rod (2) is fixedly installed on the outer surface of the lower clamp (1). An upper clamp (3) is fixedly connected to the end of the connecting rod (2) away from the lower clamp (1). A central 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 central column (4). Limiting components (6) are provided at both ends of the central column (4). The limiting components (6) are located on the inner walls of the lower clamp (1) and the upper clamp (3) respectively. A heat dissipation component (7) is provided below the top arm of the upper clamp (3). The limiting component (6) includes a limiting frame (61), a limiting rod (62) is fixedly installed on the inner wall of the limiting frame (61), a slider (63) is slidably connected to the outer surface of the limiting rod (62), a first threaded rod (64) is rotatably connected to the inner cavity of the limiting frame (61), a buffer mechanism (65) is provided on both sides of the limiting frame (61), a positioning mechanism (66) is provided on the middle inner wall of the limiting frame (61), 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; The heat dissipation assembly (7) includes a connecting frame (71), a gear (72) is rotatably connected to the inner cavity of the connecting frame (71), 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), a gear frame (74) is slidably connected to the inner cavity of the connecting frame (71), heat dissipation mechanisms (75) are provided at both ends of the gear frame (74), a connecting plate (76) is fixedly installed on the outer surface of the gear frame (74), and four protrusions (77) are fixedly installed on the outer surface of the connecting plate (76). The central column (4) A ventilation mechanism (78) is provided between the coil (5) and the connecting frame (71) and the lower surface of the upper clamp (3). The toothed frame (74) is provided with toothed blocks in its inner cavity, and the toothed blocks of the toothed frame (74) mesh with the gear (72). Half of the gear (72) is smooth. The connecting plate (76) and the upper clamp (3) are slidably connected. There are four central columns (4) and four coils (5). The four central columns (4) are respectively set as A-phase column, B-phase column, C-phase column and N-phase column. The spacing between the central columns (4) is equal to the spacing between the protrusions (77). The protrusions (77) protrude downward.

2. A four-phase four-column reactor for power electronic devices as described in 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), a buffer seat (653) is slidably connected to the outer surface of the fixing rod (652), a connecting bar (654) is rotatably connected to the inner cavity of the buffer seat (653), a first spring (655) is provided in the middle part of the fixing rod (652), a limit bar (656) is rotatably connected to the end of the connecting bar (654) away from the buffer seat (653), 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 limit bar (656) is in close contact with the outer surface of the limit frame (61).

3. A four-phase four-column reactor for power electronic devices as described in claim 1, characterized in that, The positioning mechanism (66) includes a positioning block (661), the outer surface of which is provided with a positioning groove (662), a moving block (663) is fixedly installed in the middle part of the limiting frame (61), a spring 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 spring rod (664), a first connecting block (666) is fixedly installed on the outer surface of the spring rod (664), a button (667) is provided on the outer surface of the moving block (663), a horn (668) is fixedly installed on the outer surface of the moving block (663), and a positioning ball (669) is rotatably connected to one end of the spring rod (664) near the positioning block (661).

4. A four-phase four-column reactor for power electronic devices as described in claim 3, characterized in that, The second spring (665) is located between the inner walls of the first connecting block (666) and the moving block (663). The first connecting block (666) and the moving block (663) are slidably connected. The button (667) and the horn (668) are electrically connected. Pressing the button (667) controls the horn (668) to emit 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). The positioning ball (669) is tightly fitted to the inner wall of the middle part of the positioning block (661).

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

6. A four-phase four-column reactor for power electronic devices as described in claim 5, characterized in that, The second connecting block (671) and the slider (63) are slidably connected. The outer surfaces of the clamping block (672) and the central column (4) are in close contact. The outer surfaces of the second connecting block (671) and the central 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. 75) The threads at both ends are opposite in direction. The outer surface of the limiting block (677) near the corner of the clamping block (672) is inclined, and when it contacts the clamping block (672), it drives the limiting block (677) 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 stop bar (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).

7. A four-phase four-column reactor for power electronic devices as described in claim 1, characterized in that, The heat dissipation mechanism (75) includes a fixed block (751), the inner cavity of the fixed block (751) is provided with a sliding 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 sliding rod (754), the second sliding rod (754) and the sliding groove (752) are slidably connected, the outer surface of the second sliding rod (754) is sleeved with a fifth spring (755), the fifth spring (755) is located between the inner wall of the buffer block (753) and the fixed block (751), the outer surface of the buffer block (753) is provided with a fan (756), the fixed block (751) and the gear frame (74) are fixedly connected, and the fan (756) is located above the limiting component (6).

8. A four-phase four-column reactor for power electronic devices as described in claim 1, characterized in that, The ventilation mechanism (78) includes a metal plate (781), with shielding strips (782) fixedly installed on the inner walls of both ends of the metal plate (781). A connecting hole (783) is opened on the outer surface of the shielding strip (782). A heat sink plate (784) is slidably connected to the inner cavity of the metal plate (781). A ventilation hole (785) is opened on the outer surface of the heat sink plate (784). Shielding rods (786) are fixedly installed at both ends of the heat sink plate (784). A pressing rod (787) is fixedly installed in the middle part of the heat sink plate (784). A sixth spring (788) is sleeved on the outer surface of the pressing rod (787).

9. A four-phase four-column reactor for power electronic devices as described in claim 8, characterized in that, The extrusion rod (787) and the shielding strip (782) are slidably connected. The sixth spring (788) is located between the heat sink (784) and the shielding strip (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 central column (4) and the coil (5). The top of the extrusion rod (787) is located on the lower surface of the connecting plate (76). When the connecting plate (76) moves, the protrusion (77) extrudes the top of the extrusion rod (787).

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