A heat dissipation device, an exhaust system and a low-harmonic rectifier

Abstract

The application discloses a heat dissipation device, an exhaust system and a low-harmonic rectifier in the field of rectifier cooling, which comprises a blast pipe and a fluid box; a power shaft is rotationally connected in the blast pipe; an airflow fan is arranged on the power shaft; an inner gear ring is rotationally connected outside the blast pipe; the power shaft is in transmission connection with the inner gear ring through a first transmission mechanism; the fluid box is rotationally connected outside the blast pipe and is in intercommunication with the blast pipe; a power column is arranged on the fluid box; an elastic hook matched with the power column is arranged on the inner gear ring; the airflow in the blast pipe drives the airflow fan and the power shaft to rotate, the power shaft drives the inner gear ring to rotate through the first transmission mechanism, and the elastic hook drives the fluid box to move; the airflow in the blast pipe is discharged from an exhaust port of the fluid box; the rectifier is subjected to multi-angle cooling, and the service life of the rectifier is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of rectifier cooling technology, specifically relating to heat dissipation devices, exhaust systems, and low harmonic rectifiers. Background Technology

[0002] Harmonics pose a significant threat to the safe and reliable operation of power systems in social life and industrial production. Harmonic measurement plays an important role in power systems. The harm caused by harmonics is very serious. Harmonics reduce the efficiency of power production, transmission and utilization, cause electrical equipment to overheat, generate vibration and noise, and cause insulation aging, shorten service life, or even cause failure or burnout.

[0003] With the continuous commissioning of high-voltage direct current transmission systems, converter equipment rectifiers and inverters have become the main sources of harmonics in the power system and the hub connecting AC and DC systems. A rectifier is a nonlinear power electronic component that generates pulsating voltage and current waveforms rather than ideal sine waves during the process of converting AC to DC (and inverting DC to AC), thus generating a large number of harmonics.

[0004] Low harmonic rectifiers are used in power grids. During long-term use in high-voltage transmission systems, rectifiers continuously generate heat. If they are not effectively cooled, their lifespan and operational safety will be threatened. Referring to a high-power high-frequency high-voltage rectifier with patent publication number CN205901608U, the internal structure of the rectifier is complex. If it is blown by a fan in one direction using traditional technology, there will inevitably be many blind spots in the airflow, resulting in an insignificant cooling effect and heat retention within the rectifier. Summary of the Invention

[0005] The purpose of this invention is to provide a heat dissipation device, an exhaust system, and a low harmonic rectifier, which cools the rectifier from multiple angles, enabling the rectifier to have a longer service life and higher power control efficiency in high-voltage power transmission environments.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A heat dissipation device includes an air supply duct and a fluid box; a power shaft is rotatably connected inside the air supply duct; an airflow fan is mounted on the power shaft; an internal gear ring is rotatably connected outside the air supply duct; the power shaft is driven by the internal gear ring through a first transmission mechanism.

[0008] The fluid box is rotatably connected to the outside of the air supply pipe, and the fluid box is connected to one end of the air supply pipe. One end of the air supply pipe is used to connect to an external air supply device, which is used to provide cold air. A power column is provided on the fluid box. An elastic hook that cooperates with the power column is provided on the internal gear ring.

[0009] The airflow in the air supply duct drives the airflow fan and the power shaft to rotate. The power shaft drives the internal gear ring to rotate through the first transmission mechanism. The elastic hook moves the fluid box. The fluid box is provided with an exhaust port. The airflow in the air supply duct is discharged from the exhaust port of the fluid box. The airflow discharged from the exhaust port is used to cool the electrical components.

[0010] Preferably, the first transmission mechanism includes an external short shaft and a secondary shaft; a connecting plate for mounting the secondary shaft is provided on the outer wall of the air supply pipe; the external short shaft is arranged radially along the air supply pipe and is rotatably mounted on the side wall of the air supply pipe; one side of the external short shaft is connected to the power shaft via a bevel gear transmission, and the other side of the external short shaft is connected to the secondary shaft via a bevel gear transmission; the secondary shaft is provided with a cylindrical gear that meshes with an internal gear ring.

[0011] Preferably, the outer wall of the air supply duct is provided with a plurality of fan-shaped plates evenly arranged in the circumferential direction; the fan-shaped plates are provided with arc-shaped grooves, and the internal gear ring is disposed in the arc-shaped grooves.

[0012] In a second aspect, the present invention provides an exhaust system, including a filter device and a heat dissipation device as described in any of the first aspects; the filter device is disposed at the exhaust port of the fluid box, and the filter device includes two pillars and a breathable cloth; the breathable cloth is configured as an annular shape; the breathable cloth is wrapped around the two pillars.

[0013] Preferably, an outer support slide plate and an inner support slide plate are provided between the two pillars; the breathable fabric is provided between the outer support slide plate and the inner support slide plate; the two sides of the outer support slide plate and the inner support slide plate are connected to the two pillars; and the middle of the outer support slide plate and the inner support slide plate is provided with a perforation for airflow.

[0014] Preferably, the column includes a longitudinal support shaft; the breathable cloth is wound around the longitudinal support shaft of the two columns; a dust collection box is provided on the outer cover of the longitudinal support shaft; an elastic scraper is provided inside the dust collection box, the elastic scraper is in contact with the breathable cloth, and the elastic scraper is used to scrape off the dust on the breathable cloth; the driving device drives the longitudinal support shaft and the breathable cloth to rotate synchronously, and the elastic scraper scrapes off the dust on the breathable cloth.

[0015] Preferably, the column includes a longitudinal support shaft; the breathable fabric is wound around the longitudinal support shaft of the two columns; a dust collection box is provided on the outer cover of the longitudinal support shaft; an elastic scraper is provided inside the dust collection box, the elastic scraper is in contact with the breathable fabric, and the elastic scraper is used to scrape off the dust on the breathable fabric; the fluid box is connected to the longitudinal support shaft of the two columns through a second transmission mechanism; the moving fluid box drives the longitudinal support shaft and the breathable fabric to rotate synchronously, and the elastic scraper scrapes off the dust on the breathable fabric.

[0016] Preferably, the column further includes a support base and a support plate; a rotating body is rotatably mounted on the support base; the longitudinal support shaft is mounted on the rotating body; one end of the support plate is connected to the support base, and the other end of the support plate is connected to the dust collection box.

[0017] Preferably, the second transmission mechanism includes a brake belt, a central control body, and a power rod; the fluid box is provided with an arc-shaped rack; transmission teeth are linearly arrayed at both ends of the power rod, and the arc-shaped rack meshes with the transmission teeth; semi-cylinders are linearly arrayed in the middle of the power rod; an arc-shaped spring is provided on the central control body; the arc-shaped spring meshes with the semi-cylinders to limit the unidirectional rotation of the central control body driven by the power rod; the longitudinal support shafts of the two columns and the central control body are connected by a brake belt; the moving fluid box drives the power rod to move horizontally, and the power rod drives the central control body and the longitudinal support shafts of the two columns to rotate synchronously.

[0018] Preferably, the exhaust system includes two sets of heat dissipation devices and a single filter device. Each set of heat dissipation devices includes an air supply duct and a fluid box. The exhaust ports of the fluid boxes in both sets of heat dissipation devices are directed toward the breathable fabric of the same filter device.

[0019] Preferably, the second transmission mechanism further includes a main frame; the two sides of the main frame are respectively connected to the air supply pipes of the two sets of heat dissipation devices; the power rod is slidably connected to the main frame; and the central control body is rotatably connected to the main frame.

[0020] Preferably, the central control body includes an inner shaft and a pulley; the inner shaft is rotatably connected to the main frame; the pulley is disposed on the inner shaft and is connected to the brake belt; a plurality of arc spring pieces are evenly arranged around the inner shaft.

[0021] Preferably, the exhaust system includes two sets of heat dissipation devices and a single filter device; the exhaust vents of the fluid boxes in the two sets of heat dissipation devices are all directed toward the same filter device.

[0022] Preferably, the air supply pipe is provided with a reset spring plate for limiting the movement range of the fluid box. When the elastic hook moves the fluid box, the fluid box squeezes the reset spring plate, and the elastic hook and the reset spring plate undergo elastic deformation. When the elastic deformation of the elastic hook reaches a set degree, the elastic hook and the power column slip off, and the reset spring plate pushes the fluid box to reset.

[0023] Preferably, the fluid box includes a sleeve and an exhaust duct that are interconnected; the sleeve is fitted over the air supply pipe; the exhaust port is disposed on the exhaust duct; and the reset spring plate acts on the exhaust duct.

[0024] In a second aspect, the present invention provides a low harmonic rectifier, comprising a housing; a plurality of electrical components are arranged inside the housing; an exhaust system as described in any one of the second aspects is provided on both sides of the electrical components; and the heat dissipation device of the exhaust system faces the electrical components.

[0025] Preferably, a serpentine coil is provided inside the housing; the air supply pipe of the exhaust system is connected to the serpentine coil; and an external air supply device is connected to the serpentine coil.

[0026] Preferably, the housing includes an outer casing and a silicon stack main board; the silicon stack main board is disposed on the top of the outer casing; the outer casing is provided with a silicon stack base plate and a silicon stack plate for installing electrical components and a ventilation system; the outer casing is provided with through holes for heat dissipation.

[0027] In a third aspect, the present invention provides a low-harmonic-wave high-voltage direct current transmission system, including the low-harmonic rectifier described in any one of the third aspects.

[0028] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0029] In this invention, the airflow within the air supply duct drives the airflow fan and the power shaft to rotate. The power shaft drives the internal gear ring to rotate via a first transmission mechanism, and the elastic hook actuates the fluid box. The fluid box is equipped with an exhaust port. The airflow within the air supply duct is discharged from the exhaust port of the fluid box, thereby achieving multi-angle heat dissipation and cooling of electrical components and improving the service life of the electrical components. At the same time, compared with the electric device driving the fluid box, using fluid to drive the fluid box avoids the heat generated by electrical energy and improves the safety of heat dissipation.

[0030] In this invention, the exhaust port of the fluid box faces the filter device. The fluid box is connected to the longitudinal support shaft of the two columns via a second transmission mechanism. The moving fluid box drives the longitudinal support shaft and the breathable cloth to rotate synchronously. The filter device filters the airflow. By driving the longitudinal support shaft and the breathable cloth to rotate synchronously through the moving fluid box, the dust on the breathable cloth is automatically scraped off by the elastic scraper, which improves the service life of the filter device. At the same time, the automatic scraping of dust on the breathable cloth is also driven by fluid, avoiding the heat generated by electrical energy. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the heat dissipation device structure provided in Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the air supply pipe and fluid box provided in Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the first transmission mechanism provided in Embodiment 1 of the present invention.

[0034] Figure 4 This is a schematic diagram of the exhaust system provided in Embodiment 2 of the present invention;

[0035] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0036] Figure 6 This is an isometric view of the ventilation system provided in Embodiment 2 of the present invention;

[0037] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0038] Figure 8 This is a schematic diagram of the filtration device provided in Embodiment 2 of the present invention;

[0039] Figure 9 This is a schematic diagram of the column structure provided in Embodiment 2 of the present invention;

[0040] Figure 10 This is a schematic diagram of the dust collection box structure provided in Embodiment 2 of the present invention;

[0041] Figure 11 This is an isometric view of the rectifier provided in Embodiment 3 of the present invention;

[0042] Figure 12 This is a structural diagram of the rectifier provided in Embodiment 3 of the present invention;

[0043] Figure 13 This is a schematic diagram of the structure of the electrical component provided in Embodiment 3 of the present invention;

[0044] Figure 14 This is a structural diagram of the serpentine coil provided in Embodiment 3 of the present invention. In the diagram: 1 Outer casing, 2 Silicon stack main board, 3 Electrical components, 4 Serpentine coil, 5 Silicon stack plate, 6 Silicon stack base plate, 7 Capacitor, 8 Exhaust system, 9 Connecting column, 10 Filter device, 11 Heat dissipation device, 12 Second transmission mechanism, 13 Brake belt, 14 Main frame, 15 Central control body, 16 Power rod, 17 Breathable cloth, 18 External support plate, 19 Internal support plate, 20 Column, 21 Rotating body, 22 Elastic scraper, 23 Dust collection box, 24 Support plate, 25 longitudinal support shaft, 26 support base, 27 pulley, 28 inner shaft, 29 arc spring sheet, 30 first transmission mechanism, 31 fluid box, 32 external control assembly, 33 arc rack, 34 return spring sheet, 35 air supply pipe, 36 internal gear ring, 38 sector plate, 39 elastic hook, 40 power column, 41 airflow fan, 42 power shaft, 43 L-shaped inner plate, 44 external short shaft, 45 connecting plate, 46 pneumatic gear, 47 secondary shaft. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0046] It should be noted that in the description of this invention, the terms "front," "rear," "left," "right," "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "front," "rear," "left," "right," "upper," and "lower" used in the description of this invention refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0047] Example 1

[0048] like Figures 1 to 3 As shown, a heat dissipation device includes an air supply duct 35 and a fluid box 31 that are interconnected; a power shaft 42 is rotatably connected inside the air supply duct 35; an airflow fan 41 is provided on the power shaft 42; an internal gear ring 36 is rotatably connected outside the air supply duct 35; a plurality of fan-shaped plates 38 are evenly arranged circumferentially on the outer wall of the air supply duct 35; an arc-shaped groove is provided on the fan-shaped plate 38, and the internal gear ring 36 is disposed in the arc-shaped groove.

[0049] The fluid box 31 includes a sleeve and an exhaust duct that are interconnected; the sleeve is fitted over the air supply pipe 35 and is connected to the air supply pipe 35; the exhaust duct is a cuboid and has an exhaust port; a power column 40 is provided on the fluid box 31; an elastic hook 39 that cooperates with the power column 40 is provided on the internal gear ring 36; the internal gear ring 36, the elastic hook 39, the power column 40, and the sector plate 38 constitute an external control assembly 32; the power shaft 42 is connected to the internal gear ring 36 of the external control assembly 32 via a first transmission mechanism 30.

[0050] The first transmission mechanism 30 includes an external short shaft 44 and a secondary shaft 47; an L-shaped inner plate 43 is connected to the inner wall of the air supply pipe 35, and the secondary shaft 47 is disposed on the L-shaped inner plate 43; a connecting plate 45 for mounting the secondary shaft 47 is disposed on the outer wall of the air supply pipe 35; the external short shaft 44 is arranged radially along the air supply pipe 35 and is rotatably mounted on the side wall of the air supply pipe 35 and the L-shaped inner plate 43; one side of the external short shaft 44 is connected to the power shaft 42 via a bevel gear transmission, and the other side of the external short shaft 44 is connected to the secondary shaft 47 via a bevel gear transmission; the secondary shaft 47 is disposed outside the air supply pipe 35; a cylindrical gear 46 that meshes with an internal gear ring 36 is provided on the secondary shaft 47.

[0051] The airflow within the air supply duct 35 drives the airflow fan 41 and the power shaft 42 to rotate. The power shaft 42 drives the internal gear ring 36 to rotate via the first transmission mechanism 30. The elastic hook 39 on the internal gear ring 36 actuates the fluid box 31. The airflow within the air supply duct 35 is discharged from the exhaust port of the fluid box 31. This achieves multi-angle heat dissipation and cooling of electrical components, improving their service life. Compared with electric devices driving the fluid box, using fluid to drive the fluid box 31 avoids heat generated by electrical energy, improving the safety of heat dissipation.

[0052] Example 2

[0053] like Figures 4 to 10 As shown, an exhaust system for cooling includes a single filter device 10 and two sets of heat dissipation devices 11 as described in Embodiment 1, with the two sets of heat dissipation devices 11 facing the same filter device 10.

[0054] The exhaust port of the fluid box 31 faces the filter device 10. The filter device 10 includes two pillars 20 and a breathable cloth 17. The breathable cloth 17 is arranged in a ring shape. The breathable cloth 17 is wrapped around the two pillars 20 to filter the airflow. An outer support slide plate 18 and an inner support slide plate 19 are provided between the two pillars 20. The breathable cloth 17 is located between the outer support slide plate 18 and the inner support slide plate 19 to realize the installation and restriction of the breathable cloth 17. The two sides of the outer support slide plate 18 and the inner support slide plate 19 are connected to the two pillars 20. The middle of the outer support slide plate 18 and the inner support slide plate 19 is provided with a hollow for airflow.

[0055] The column member 20 includes a support base 26, a support plate 24, and a longitudinal support shaft 25; a rotating body 21 is rotatably mounted on the support base 26; the longitudinal support shaft 25 is mounted on the rotating body 21, and the longitudinal support shaft 25 and the rotating body 21 are coaxial; a dust collection box 23 is provided over the longitudinal support shaft 25; the dust collection box 23 has a notch for the breathable cloth 17 to pass through, and the dust collection box 23 and the rotating body 21 are coaxial; an elastic scraper 22 is provided inside the dust collection box 23, and the elastic scraper 22 contacts the breathable cloth 17 and is used to scrape off dust from the breathable cloth 17; one end of the support plate 24 is connected to the support base 26, and the other end of the support plate 24 is connected to the dust collection box 23; the breathable cloth 17 is wound around the longitudinal support shaft 25 of the two columns 20.

[0056] The fluid box 31 is connected to the longitudinal support shaft 25 of the two columns 20 via a second transmission mechanism 12. The second transmission mechanism 12 includes a brake belt 13, a central control body 15, a power rod 16, and a main frame 14. The two sides of the main frame 14 are respectively connected to the air supply pipes 35 of the two sets of heat dissipation devices 11. The power rod 16 is slidably connected to the main frame 14. The fluid box 31 is provided with an arc-shaped rack 33. The two ends of the power rod 16 are linearly arrayed with transmission teeth, and the arc-shaped rack 33 meshes with the transmission teeth. The middle part of the power rod 16 is linearly arrayed with semi-columns.

[0057] The central control body 15 is rotatably connected to the main frame 14; the central control body 15 includes an inner shaft 28 and a pulley 27; the inner shaft 28 is rotatably connected to the main frame 14; the pulley 27 is disposed on the inner shaft 28; a plurality of arc spring pieces 29 are evenly arranged around the inner shaft 28; the arc spring pieces 29 mesh with the semi-cylinder to limit the power rod 16 from driving the central control body 15 to rotate in one direction.

[0058] The longitudinal support shaft 25 is provided with an annular groove for connecting the brake belt 13; the longitudinal support shaft 25 of the two columns 20 and the pulley 27 are connected by the brake belt 13; the moving fluid box 31 drives the power rod 16 to move horizontally, and the power rod 16 drives the central control body 15 and the longitudinal support shaft 25 of the two columns 20 to rotate synchronously; the moving fluid box 31 drives the longitudinal support shaft 25 and the breathable cloth 17 to rotate synchronously, and the elastic scraper 22 scrapes off the dust on the breathable cloth 17; by the moving fluid box 31 driving the longitudinal support shaft 25 and the breathable cloth 17 to rotate synchronously, the dust on the breathable cloth 17 is automatically scraped off by the elastic scraper 22, which improves the service life of the filter device 10.

[0059] Alternatively, the drive device can directly drive the longitudinal support shaft 25 and the breathable cloth 17 to rotate synchronously, and the elastic scraper 22 can scrape off the dust on the breathable cloth 17. The drive device includes, but is not limited to, an engine.

[0060] The air supply duct 35 is equipped with a return spring plate 34 for limiting the movement range of the fluid box 31. The return spring plate 34 acts on the exhaust duct. When the elastic hook 39 moves the fluid box 31, the fluid box 31 squeezes the return spring plate 34, and the elastic hook 39 and the return spring plate 34 undergo elastic deformation. When the elastic deformation of the elastic hook 39 reaches a set level, the elastic hook 39 and the power column 40 slip off, and the return spring plate 34 pushes the fluid box 31 to reset. The internal gear ring 36 drives the elastic hook 39 to rotate one revolution and then re-engages the power column 40. The cycle repeats, causing the fluid box 31 to perform a reciprocating swinging motion.

[0061] Specifically, because the arc spring 29 engages with the semi-cylinder to limit the unidirectional rotation of the central control body 15 driven by the power rod 16; during the process of the fluid box 31 squeezing the reset spring 34, the power rod 16 moves but does not drive the central control body 15 to rotate; during the process of the reset spring 34 pushing the fluid box 31 to reset, the power rod 16 moves but then drives the central control body 15 to rotate unidirectionally; thus, the reciprocating oscillating motion of the fluid box 31 is used to drive the unidirectional rotation of the breathable fabric 17.

[0062] The working process is as follows: the airflow in the air supply duct 35 is injected into the fluid box 31 and then discharged outwards, presenting as a surface fluid impacting the filter device 10. After passing through the filter device 10, the fluid impacts the electrical components, achieving air cooling. Specifically, the airflow in the air supply duct 35 drives the airflow fan 41 to rotate, which in turn drives the external short shaft 44 through the power shaft 42, and then drives the internal gear ring 36 to rotate through the countershaft 47 and the pneumatic gear 46. The elastic hook 39 rotates and moves the power column 40, causing the fluid box 31 to swing. During the swinging process, the elastic deformation of the return spring plate 34 gradually increases. After reaching the critical point, the elastic hook 39 bends and slips off the power column 40. In this way, the return spring plate 34 controls the fluid box 31 to swing back and reset. This cycle continues, and the fluid box 31 swings within a certain range. When the return spring plate 34 pushes the fluid box 31 to stop, the fluid box 31... When stationary, the internal gear ring 36 rotates, driving the elastic hook 39. The elastic hook 39 rotates and pushes the power column 40, thereby controlling the fluid box 31 to swing. The fluid box 31 then swings in the opposite direction. The fluid box 31 continues to swing while blowing air outward. The airflow passes through the moving breathable cloth 17, and the dust is intercepted by the breathable cloth 17. Specifically, the fluid box 31 drives the arc-shaped rack 33, controlling the power rod 16 to move back and forth. The middle part of the power rod 16 cooperates with the arc-shaped spring 29 to control the unidirectional transmission of the inner shaft 28. The belt pulley 27 drives the brake belt 13, and then drives the rotating body 21 through the longitudinal support shaft 25. The rotating body 21 rotates to control the movement of the breathable cloth 17. The dust intercepted on the breathable cloth 17 moves along with it. When the breathable cloth 17 partially passes through the elastic scraper 22, the dust on the breathable cloth 17 is scraped off by the elastic scraper 22. The filter device 10 continuously cleans the airflow and collects dust.

[0063] Example 3

[0064] like Figures 11 to 14As shown, a low-harmonic rectifier includes an outer casing 1 and a silicon stack main board 2. The silicon stack main board 2 is disposed on the top of the outer casing 1 and forms a shell. The outer casing 1 has through holes for heat dissipation. Multiple unit components 3 are arranged inside the shell. Each unit component 3 includes an electrical component 7, a silicon stack base plate 6, and a silicon stack plate 5. The silicon stack base plate 6 and the silicon stack plate 5 are arranged parallel to each other. The electrical component 7 is installed between the silicon stack base plate 6 and the silicon stack plate 5. The exhaust system 8 described in Embodiment 2 is respectively provided on both sides of the electrical component 7. The outer support slide plate 18 and the inner support slide plate 1... The bottom of the 9 is provided with an external protrusion plate, which is fixed on the silicon stack base plate 6; the silicon stack plate 5 is provided with a connecting post 9; the connecting post 9 penetrates the silicon stack main plate 2; the exhaust port of the heat dissipation device 11 faces the electrical component 7; a serpentine coil 4 is provided inside the housing; one end of the air supply pipe 35 of the exhaust system 8 is fixed on the silicon stack base plate 6, and the other end of the air supply pipe 35 penetrates the silicon stack plate 5 and connects to the serpentine coil 4; the serpentine coil 4 is externally connected to an air supply device; an air outlet is provided in the middle of the air supply pipe 35, and the air supply pipe 35 and the fluid box 31 are connected through the air outlet.

[0065] Example 4

[0066] Thirdly, the present invention provides a low-harmonic-wave high-voltage direct current transmission system, including the low-harmonic rectifier described in Embodiment 3.

[0067] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An exhaust system, characterized in that, Includes filtration and heat dissipation devices; The heat dissipation device includes an air supply duct and a fluid box; a power shaft is rotatably connected inside the air supply duct; an airflow fan is installed on the power shaft; an internal gear ring is rotatably connected outside the air supply duct; the power shaft is connected to the internal gear ring through a first transmission mechanism. The fluid box is rotatably connected to the outside of the air supply pipe, and the fluid box is connected to one end of the air supply pipe. One end of the air supply pipe is used to connect to an external air supply device, which is used to provide cold air. A power column is provided on the fluid box. An elastic hook that cooperates with the power column is provided on the internal gear ring. The airflow in the air supply duct drives the airflow fan and the power shaft to rotate. The power shaft drives the internal gear ring to rotate through the first transmission mechanism. The elastic hook moves the fluid box. The fluid box is provided with an exhaust port. The airflow in the air supply duct is discharged from the exhaust port of the fluid box. The airflow discharged from the exhaust port is used to cool the electrical components. A filter device is installed at the exhaust port of the fluid box. The filter device includes two columns and a breathable cloth. The breathable cloth is arranged in a ring shape and is wrapped around the two columns. The column includes a longitudinal support shaft; the breathable fabric is wound around the longitudinal support shaft of the two columns; a dust collection box is provided on the outer cover of the longitudinal support shaft; an elastic scraper is provided inside the dust collection box, the elastic scraper contacts the breathable fabric, and the elastic scraper is used to scrape off the dust on the breathable fabric; the fluid box is connected to the longitudinal support shaft of the two columns through a second transmission mechanism; the moving fluid box drives the longitudinal support shaft and the breathable fabric to rotate synchronously, and the elastic scraper scrapes off the dust on the breathable fabric; The second transmission mechanism includes a brake belt, a central control body, and a power rod; the fluid box is provided with an arc-shaped rack; transmission teeth are linearly arrayed at both ends of the power rod, and the arc-shaped rack meshes with the transmission teeth; semi-cylinders are linearly arrayed in the middle of the power rod; an arc-shaped spring is provided on the central control body; the arc-shaped spring meshes with the semi-cylinders to limit the unidirectional rotation of the central control body driven by the power rod; the longitudinal support shafts of the two pillars and the central control body are connected by a brake belt; the moving fluid box drives the power rod to move horizontally, and the power rod drives the central control body and the longitudinal support shafts of the two pillars to rotate synchronously.

2. The exhaust system according to claim 1, characterized in that, The first transmission mechanism includes an external short shaft and a secondary shaft; a connecting plate for mounting the secondary shaft is provided on the outer wall of the air supply pipe; the external short shaft is arranged radially along the air supply pipe and is rotatably mounted on the side wall of the air supply pipe; one side of the external short shaft is connected to the power shaft via a bevel gear transmission, and the other side of the external short shaft is connected to the secondary shaft via a bevel gear transmission; the secondary shaft is provided with a cylindrical gear that meshes with an internal gear ring.

3. The exhaust system according to claim 1, characterized in that, The outer wall of the air supply duct is uniformly provided with multiple fan-shaped plates in the circumferential direction; the fan-shaped plates are provided with arc-shaped grooves, and the internal gear ring is disposed in the arc-shaped grooves.

4. The exhaust system according to claim 1, characterized in that, An outer support slide plate and an inner support slide plate are provided between the two pillars; a breathable fabric is provided between the outer support slide plate and the inner support slide plate; the two sides of the outer support slide plate and the inner support slide plate are connected to the two pillars; and a hollowed-out section for airflow is provided in the middle of the outer support slide plate and the inner support slide plate.

5. The exhaust system according to claim 1, characterized in that, The column also includes a support base and a support plate; a rotating body is rotatably mounted on the support base; the longitudinal support shaft is mounted on the rotating body; one end of the support plate is connected to the support base, and the other end of the support plate is connected to the dust collection box.

6. The exhaust system according to claim 1, characterized in that, The exhaust system includes two sets of heat dissipation devices and a single filter device; the exhaust vents of the fluid boxes in the two sets of heat dissipation devices are both directed toward the same filter device.

7. The exhaust system according to claim 6, characterized in that, The second transmission mechanism also includes a main frame; the two sides of the main frame are respectively connected to the air supply pipes of two sets of heat dissipation devices; the power rod is slidably connected to the main frame; and the central control body is rotatably connected to the main frame.

8. The exhaust system according to claim 7, characterized in that, The central control unit includes an inner shaft and a pulley; the inner shaft is rotatably connected to the main frame; the pulley is disposed on the inner shaft and is connected to the brake belt; multiple arc spring pieces are evenly arranged around the inner shaft.

9. The exhaust system according to claim 1, characterized in that, The air supply pipe is equipped with a reset spring plate for limiting the movement range of the fluid box. When the elastic hook moves the fluid box, the fluid box squeezes the reset spring plate, and the elastic hook and the reset spring plate undergo elastic deformation. When the elastic deformation of the elastic hook reaches a set level, the elastic hook and the power column slip off, and the reset spring plate pushes the fluid box to reset.

10. The exhaust system according to claim 9, characterized in that, The fluid box includes a sleeve and an exhaust duct that are interconnected; the sleeve is fitted over the air supply pipe; the exhaust port is located on the exhaust duct; and the reset spring plate acts on the exhaust duct.

11. A low-harmonic rectifier, comprising a housing; wherein a plurality of electrical components are arranged within the housing; characterized in that, The electrical component is provided with an exhaust system as described in any one of claims 1 to 10 on both sides; the heat dissipation device of the exhaust system faces the electrical component.

12. The low-harmonic rectifier according to claim 11, characterized in that, The housing is equipped with a serpentine coil; the air supply pipe of the exhaust system is connected to the serpentine coil; and the serpentine coil is externally connected to an air supply device.

13. The low-harmonic rectifier according to claim 11, characterized in that, The housing includes an outer casing and a silicon stack main board; the silicon stack main board is located on the top of the outer casing; the outer casing contains a silicon stack base plate and a silicon stack plate for installing electrical components and a ventilation system; the outer casing has through holes for heat dissipation.

14. A low harmonic high-voltage direct current transmission system, characterized in that, Includes the low harmonic rectifier as described in any one of claims 11 to 13.

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