Silicon carbide high-frequency rectifier

Abstract

The invention relates to the technical field of rectifiers, in particular to a silicon carbide high-frequency rectifier which comprises a high-frequency rectifier body, a full-automatic fire extinguishing treatment mechanism is arranged on the outer side of the high-frequency rectifier body, and the full-automatic fire extinguishing treatment mechanism comprises a rectifier fixing base; when spontaneous combustion happens to the high-frequency rectifier, the high-frequency rectifier can be automatically thrown into the liquid fire extinguishing agent so that fire extinguishing treatment can be conducted on the high-frequency rectifier, and in the process that the high-frequency rectifier is thrown into the liquid fire extinguishing agent, a cable connected to the high-frequency rectifier can be automatically cut off; according to the technical scheme, the safety of the equipment is improved, and meanwhile, the high-frequency rectifier which is spontaneously combusted can be prevented from influencing the equipment which is electrically connected with the high-frequency rectifier; the problems that in the using process of the high-frequency rectifier, spontaneous combustion possibly happens due to circuit faults, the danger level is high, and when spontaneous combustion happens to the high-frequency rectifier, other devices electrically connected with the high-frequency rectifier may be affected, and consequently cascading faults are caused are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of rectifiers, in particular to a silicon carbide high-frequency rectifier. Background Art

[0002] Air-cooled rectifier is a power conversion device, mainly used to convert AC into DC. Air-cooled rectifier converts AC into DC through built-in rectifier devices (such as diodes or thyristors). During the rectification process, the positive and negative half-cycles of AC are converted into currents in a single direction, thereby obtaining DC output.

[0003] When producing air-cooled rectifiers, silicon carbide material can be used as the raw material for key components inside the air-cooled rectifier. Silicon carbide is a wide bandgap semiconductor material with excellent switching speed and low switching loss, as well as low temperature dependence of on-resistance. These characteristics enable SIC devices to perform well in high-frequency applications and achieve higher efficiency and power density. This air-cooled rectifier containing SIC devices made of silicon carbide as raw material can operate at a frequency of 500kHz to 1.5MHz, which is higher than the frequency of traditional 100kHz-200kHz DC / DC converters. This air-cooled rectifier can also be called a silicon carbide high-frequency rectifier.

[0004] However, this type of silicon carbide high-frequency rectifier will generate a relatively high temperature during operation, and long-term use will cause aging of its internal parts. When the aging of the internal parts of the high-frequency rectifier is too serious, it may cause spontaneous combustion due to capacitor leakage or fuse burnout. The danger is relatively high. When the high-frequency rectifier spontaneously combusts, it may affect the equipment that is electrically connected to it through cables at this time, thereby causing a chain failure. Therefore, it does not meet the existing needs, and we have proposed a silicon carbide high-frequency rectifier. Summary of the invention

[0005] The purpose of the present invention is to provide a silicon carbide high-frequency rectifier to solve the problem that the silicon carbide high-frequency rectifier mentioned in the above background technology will generate a high temperature during operation, and long-term use will cause aging of its internal parts. When the aging of the internal parts of the high-frequency rectifier is too serious, it may cause spontaneous combustion due to capacitor leakage or fuse burnout, which is very dangerous. When the high-frequency rectifier spontaneously combusts, it may affect the equipment that is electrically connected to it through cables at this time, thereby causing chain failures and other problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a silicon carbide high-frequency rectifier, comprising a high-frequency rectifier, wherein a fully automatic fire extinguishing treatment mechanism is arranged on the outer side of the high-frequency rectifier, wherein the fully automatic fire extinguishing treatment mechanism comprises a rectifier fixing base, a fire extinguishing box, a liquid fire extinguishing agent, a base fixing groove, two connecting plates, two internal thread through holes, two strip-shaped connecting fixing plates, two internal thread connecting grooves and a synchronous transmission mechanism, wherein the liquid fire extinguishing agent is located inside the fire extinguishing box, the base fixing groove is located in the middle position of the upper end surface of the fire extinguishing box, and the rectifier fixing base is located inside the base fixing groove; The two connecting plates are respectively fixed to the two sides of the upper end surface of the rectifier fixing base, the two internal threaded through holes are respectively located at the lower side of the front end surface of the first connecting plate counted from left to right and the lower side of the rear end surface of the second connecting plate, the two strip-shaped connecting and fixing plates are respectively located in front of the first internal threaded through hole counted from left to right and behind the second internal threaded through hole, the lower end surface of the strip-shaped connecting and fixing plate is fixed to the fire extinguishing box, the two internal threaded connecting grooves are respectively located on the outer surfaces of the two strip-shaped connecting and fixing plates, and the positions of the two internal threaded connecting grooves respectively correspond to the positions of the two internal threaded through holes, a threaded fixing rod is provided inside the first internal threaded connecting groove and the internal threaded through hole counted from left to right, a threaded fixing rod is also provided inside the second internal threaded connecting groove and the internal threaded through hole counted from left to right, and the synchronous transmission mechanism can synchronously drive the two threaded fixing rods to rotate; A cable connector is fixedly installed on one side of the outer surface of the high-frequency rectifier, and a cable automatic cutting mechanism installed on the full-automatic fire extinguishing treatment mechanism is provided on one side of the cable connector. The cable automatic cutting mechanism includes a gear transmission mechanism and a sawtooth cutting bar. The position of the sawtooth cutting bar corresponds to the position of the cable connector, and the gear transmission mechanism can drive the sawtooth cutting bar to move back and forth in a cycle.

[0007] Preferably, the fully automatic fire extinguishing mechanism further comprises two fire sensors, and the two fire sensors are respectively fixedly mounted on the outer surfaces of the two connecting plates.

[0008] Preferably, the synchronous transmission mechanism includes a sealing cover, a stepper motor is fixedly installed inside the sealing cover, the stepper motor is electrically connected to the fire sensor, the output shaft of the stepper motor is connected to the transmission shaft through a coupling, a shaft is provided on both sides of the transmission shaft, and the two shafts are connected in series with the transmission shaft through a synchronous chain respectively.

[0009] Preferably, a first bevel transmission gear is provided on the lower fixed sleeve of the outer surface of the rotating shaft, the first bevel transmission gear is meshed with a second bevel transmission gear, the axis of the second bevel transmission gear is connected to a rotating shaft head, and the rotating shaft head is connected to the connecting plate through a roller bearing.

[0010] Preferably, a square rotating shaft is fixedly connected to the surface of the rotating shaft head facing the nearest threaded fixing rod, and a square through hole located in the middle of the front end surface of the threaded fixing rod is provided on the outer side of the top end of the square rotating shaft.

[0011] Preferably, the inner wall cross-section of the square through hole is a square, the outer surface of the square rotating shaft fits with the inner wall of the square through hole, and the square rotating shaft is slidably connected to the square through hole.

[0012] Preferably, a cylindrical groove located inside the connecting plate is provided on one side of the square through hole, the cylindrical groove is communicated with the inside of the internal threaded through hole, and the inner wall diameter of the cylindrical groove is larger than the cross-sectional diameter of the threaded fixing rod.

[0013] Preferably, the gear transmission mechanism includes a first gear, the first gear meshing with the second gear, the axis of the second gear is connected to the gear shaft, a fixed sleeve on one side of the outer surface of the gear shaft is provided with a first bevel gear, the first bevel gear meshing with the second bevel gear, the axis of the second bevel gear is connected to the gear transmission shaft, a fixed sleeve on one side of the outer surface of the gear transmission shaft is provided with a first transmission gear, the first transmission gear meshing with the second transmission gear, the axis of the second transmission gear is connected to a concave rod, one side of the outer surface of the concave rod is concave, and a metal sleeve is provided for a movable sleeve in the middle position of the concave part of the outer surface of the concave rod, the middle position of the front end surface of the metal sleeve is connected to a shaft connecting rod through a rotating shaft, the front end surface of the shaft connecting rod is connected to a push rod through a rotating shaft, a movable sleeve on one side of the outer surface of the push rod is provided with a guide rod, and the outer surface of the guide rod is fixed to the inner part of the sealing cover.

[0014] Preferably, an insulating strip is fixedly connected to one side of the outer surface of the push rod, the insulating strip is slidably connected to the lower end surface of the sealing cover, and the upper end surface of the sawtooth cutting strip is fixed to the lower end surface of the insulating strip.

[0015] Preferably, a metal cover plate is provided above the stepper motor and is located on the outer surface of the sealing cover, and the sealing cover and the metal cover plate are fixed by screws.

[0016] The present invention can monitor the high-frequency rectifier in real time through the fire sensor. When the high-frequency rectifier spontaneously combusts due to circuit failure or other reasons and is detected by the fire sensor, it will be automatically thrown into the liquid fire extinguishing agent to extinguish the fire. The above technical solution can automatically extinguish the spontaneously combusting high-frequency rectifier to prevent the expansion of the fire source, thereby improving the safety of the equipment. The present invention also synchronously drives the sawtooth cutting strip to move back and forth in a cycle during the process of throwing the high-frequency rectifier into the liquid fire extinguishing agent. The sawtooth cutting strip that moves back and forth in a cycle will contact the cable connected to the cable connector as the high-frequency rectifier descends, thereby cutting it off. The above technical solution can prevent the high-frequency rectifier that has spontaneously combusted from affecting other equipment that is electrically connected to it, thereby further improving the safety protection of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the internal structure of the present invention; Figure 3 For the present invention Figure 2 A magnified view of the structure at center A; Figure 4 For the present invention Figure 2 A magnified view of the structure at B in the middle; Figure 5 A top view of the internal structure of the sealing cover of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of the structure at C in the middle. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] See also Figures 1 to 6 The present invention provides a silicon carbide high-frequency rectifier, comprising a high-frequency rectifier 1, a fully automatic fire extinguishing treatment mechanism is arranged on the outer side of the high-frequency rectifier 1, the fully automatic fire extinguishing treatment mechanism comprises a rectifier fixed base 3, a fire extinguishing box 4, a liquid fire extinguishing agent 5, a base fixing groove 6, two connecting plates 7, two internal thread through holes 17, two strip-shaped connecting fixing plates 18, two internal thread connecting grooves 19 and a synchronous transmission mechanism, the liquid fire extinguishing agent 5 is located inside the fire extinguishing box 4, the base fixing groove 6 is located in the middle position of the upper end surface of the fire extinguishing box 4, and the rectifier fixed base 3 is located inside the base fixing groove 6; The two connecting plates 7 are respectively fixed to the two sides of the upper end surface of the rectifier fixed base 3, the two internally threaded through holes 17 are respectively located on the lower side of the front end surface of the first connecting plate 7 from left to right and the lower side of the rear end surface of the second connecting plate 7, the two strip-shaped connecting and fixing plates 18 are respectively located in front of the first internally threaded through hole 17 from left to right and behind the second internally threaded through hole 17, the lower end surface of the strip-shaped connecting and fixing plate 18 is fixed to the fire extinguishing box 4, the two internally threaded connecting grooves 19 are respectively located on the outer surfaces of the two strip-shaped connecting and fixing plates 18, and the positions of the two internally threaded connecting grooves 19 correspond to the positions of the two internally threaded through holes 17, a threaded fixing rod 20 is provided inside the first internally threaded connecting groove 19 and the internally threaded through hole 17 from left to right, a threaded fixing rod 20 is also provided inside the second internally threaded connecting groove 19 and the internally threaded through hole 17 from left to right, and the synchronous transmission mechanism can synchronously drive the two threaded fixing rods 20 to rotate.

[0020] The fully automatic fire extinguishing treatment mechanism provided by the present invention also includes two fire sensors 23, which are fixedly installed on the outer surfaces of the two connecting plates 7 respectively; the synchronous transmission mechanism includes a sealing cover 8, and a stepper motor 9 is fixedly installed inside the sealing cover 8, and the stepper motor 9 is electrically connected to the fire sensor 23, and the output shaft of the stepper motor 9 is connected to the transmission shaft 10 through a coupling, and a shaft 11 is provided on both sides of the transmission shaft 10, and the two shafts 11 are connected in series with the transmission shaft 10 through a synchronous chain 12 respectively; the high-frequency rectifier 1 can be monitored in real time by the fire sensor 23, when the high-frequency rectifier 1 spontaneously ignites due to circuit failure or other reasons and is detected by the fire sensor 23, the stepper motor 9 electrically connected thereto will automatically start, and the stepper motor 9 can drive the transmission shaft 10 connected thereto and the shaft 11 connected in series with the transmission shaft 10 through the synchronous chain 12 to rotate.

[0021] A first bevel transmission gear 13 is fixedly sleeved on the lower side of the outer surface of the rotating shaft 11, and the first bevel transmission gear 13 is meshed with a second bevel transmission gear 14. The axis of the second bevel transmission gear 14 is connected with a rotating shaft head 15, and the rotating shaft head 15 is connected to the connecting plate 7 through a roller bearing; the rotating shaft head 15 is fixedly connected with a square rotating shaft 22 on the surface facing the nearest threaded fixing rod 20, and a square through hole 21 located in the middle position of the front end surface of the threaded fixing rod 20 is provided on the outer side of the top end of the square rotating shaft 22; the rotating rotating shaft 11 can drive the first bevel transmission gear 13 fixedly sleeved on the outer surface of the rotating shaft 11 and the second bevel transmission gear 14 meshed therewith to rotate, and the rotating second bevel transmission gear 14 can drive the rotating shaft head 15 connected to the axis of the second bevel transmission gear 14 and the square rotating shaft 22 fixed to the rotating shaft head 15 to rotate together.

[0022] The inner wall cross-section of the square through hole 21 is a square, the outer surface of the square shaft 22 fits with the inner wall of the square through hole 21, and the square shaft 22 and the square through hole 21 are slidably connected; since the outer surface of the square shaft 22 fits with the inner wall of the square through hole 21 located on the outer surface of the threaded fixing rod 20, when the square shaft 22 rotates, the threaded fixing rod 20 will rotate along with it, and under the drive of the internal thread connection groove 19 and the internal thread of the internal thread through hole 17, the rotating threaded fixing rod 20 can move inward or outward, and at this time, the two threaded fixing rods 20 are moved inward synchronously, and when the threaded fixing rod 20 is completely removed from the internal thread connection groove After leaving the interior of 19, the connecting plate 7 connected with the threaded fixing rod 20 and the rectifier fixing base 3 fixed to the lower end surface of the connecting plate 7 will fall down together under the action of gravity. As the rectifier fixing base 3 descends, the high-frequency rectifier 1 fixed to the upper end surface of the rectifier fixing base 3 will fall down together. The rectifier fixing base 3 falling downward will eventually fall into the interior of the liquid fire extinguishing agent 5. The high-frequency rectifier 1 can be extinguished by the liquid fire extinguishing agent 5. The above technical solution can automatically extinguish the self-igniting high-frequency rectifier 1, thereby preventing the expansion of the fire source, thereby improving the safety of the equipment; When the two connecting plates 7 fall downward, the sealing cover 8 fixing the upper end surfaces of the two connecting plates 7 will fall downward together. When the lower end surface of the sealing cover 8 fits with the upper end surface of the fire extinguishing box 4, the high-frequency rectifier 1 can be sealed to the inside of the fire extinguishing box 4. The above technical solution can block the circulation of air, thereby preventing the high-frequency rectifier 1 from reigniting due to oxygen.

[0023] Furthermore, a cable connector 24 is fixedly installed on one side of the outer surface of the high-frequency rectifier 1, and a cable fully automatic cutting mechanism 2 installed on the fully automatic fire extinguishing processing mechanism is provided on one side of the cable connector 24. The cable fully automatic cutting mechanism 2 includes a gear transmission mechanism and a sawtooth cutting strip 215. The position of the sawtooth cutting strip 215 corresponds to the position of the cable connector 24, and the gear transmission mechanism can drive the sawtooth cutting strip 215 to move back and forth in a cycle; the gear transmission mechanism includes a first gear 201, the first gear 201 is meshed with a second gear 202, the axis of the second gear 202 is connected to a gear shaft 203, and one side of the outer surface of the gear shaft 203 is fixedly sleeved with a first gear 201. A bevel gear 204 is provided, the first bevel gear 204 is meshed with a second bevel gear 205, the axis of the second bevel gear 205 is connected to a gear transmission shaft 206, a first transmission gear 207 is fixedly sleeved on one side of the outer surface of the gear transmission shaft 206, the first transmission gear 207 is meshed with a second transmission gear 208, the axis of the second transmission gear 208 is connected to a concave rod 209, one side of the outer surface of the concave rod 209 is concave, a metal sleeve 210 is movably sleeved in the middle position of the concave part of the outer surface of the concave rod 209, the middle position of the front end surface of the metal sleeve 210 is connected to a shaft connecting rod 211 through a shaft, and the front end surface of the shaft connecting rod 211 is connected to the shaft by a shaft connecting rod. A push rod 212 is connected, and a guide rod 213 is movably sleeved on one side of the outer surface of the push rod 212, and the outer surface of the guide rod 213 is fixed to the inner part of the sealing cover 8; when the transmission shaft 10 rotates, the first gear 201 fixedly sleeved on the outer surface of the transmission shaft 10 will rotate therewith, and the rotating first gear 201 can drive the second gear 202 meshing therewith and the gear shaft 203 connected to the axis of the second gear 202 to rotate synchronously, and the rotating gear shaft 203 can drive the first bevel gear 204 fixedly sleeved on the outer surface of the gear shaft 203 and the second bevel gear 205 meshing with the first bevel gear 204 to rotate. When the second bevel gear 205 is meshed with the first bevel gear 204, the gear shaft 203 is rotated. When the wheel 205 rotates, the gear transmission shaft 206 connected to the axis of the second bevel gear 205 and the first transmission gear 207 fixedly sleeved on the outer surface of the gear transmission shaft 206 will rotate together. The rotating first transmission gear 207 can drive the second transmission gear 208 meshing therewith and the concave rod 209 connected to the axis of the second transmission gear 208 to rotate. When the concave rod 209 rotates, the metal sleeve 210 movably sleeved on the concave part of the outer surface of the concave rod 209 will revolve around the top end of the concave rod 209. During the revolution, the metal sleeve 210 will cyclically push the push rod 212 connected to it through the shaft connecting rod 211 back and forth.

[0024] An insulating strip 214 is fixedly connected to one side of the outer surface of the push rod 212, and the insulating strip 214 is slidably connected to the lower end surface of the sealing cover 8, and the upper end surface of the serrated cutting strip 215 is fixed to the lower end surface of the insulating strip 214; during the process of the push rod 212 moving back and forth in a cycle, the insulating strip 214 fixed thereto and the serrated cutting strip 215 fixed to the lower end surface of the insulating strip 214 will move back and forth in a synchronous cycle, and the serrated cutting strip 215 moving back and forth in a cycle will contact the cable connected to the cable connector 24 as the sealing cover 8 descends, thereby cutting it off. The above technical solution can prevent the high-frequency rectifier 1 that has spontaneous combustion from affecting other equipment that is electrically connected to it, thereby further improving the safety protection of the equipment.

[0025] A cylindrical groove 16 located inside the connecting plate 7 is provided on one side of the square through hole 21, and the cylindrical groove 16 is communicated with the interior of the internally threaded through hole 17, and the inner wall diameter of the cylindrical groove 16 is larger than the cross-sectional diameter of the threaded fixing rod 20; when the threaded fixing rod 20 completely leaves the interior of the internally threaded through hole 17 and the internally threaded connecting groove 19 due to the drive of the threaded structure, it will enter the interior of the cylindrical groove 16. Since there is no internal thread inside the cylindrical groove 16, the threaded fixing rod 20 that has entered the cylindrical groove 16 and is still rotating cannot move further. The above technical solution can prevent the sawtooth cutting bar 215 from cutting the cable, but because the threaded fixing rod 20 can no longer move inward inside the internally threaded through hole 17, the synchronous transmission mechanism is locked and can no longer drive the sawtooth cutting bar 215 to move back and forth for cutting.

[0026] A metal cover plate is provided above the stepper motor 9 and is located on the outer surface of the sealing cover 8 , and the sealing cover 8 and the metal cover plate are fixed by screws; the metal cover plate can protect the internal structure of the sealing cover 8 .

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. Silicon carbide high frequency rectifier, characterized in that: include: High-frequency rectifier; a fully automatic fire extinguishing treatment mechanism is arranged on the outside of the high-frequency rectifier, and the fully automatic fire extinguishing treatment mechanism comprises a rectifier fixed base, a fire extinguishing box, a liquid fire extinguishing agent, a base fixing groove, two connecting plates, two internal thread through holes, two strip-shaped connecting fixing plates, two internal thread connecting grooves and a synchronous transmission mechanism, the liquid fire extinguishing agent is located inside the fire extinguishing box, the base fixing groove is located in the middle position of the upper end surface of the fire extinguishing box, and the rectifier fixed base is located inside the base fixing groove; The two connecting plates are respectively fixed to the two sides of the upper end surface of the rectifier fixing base, the two internal threaded through holes are respectively located at the lower side of the front end surface of the first connecting plate counted from left to right and the lower side of the rear end surface of the second connecting plate, the two strip-shaped connecting and fixing plates are respectively located in front of the first internal threaded through hole counted from left to right and behind the second internal threaded through hole, the lower end surface of the strip-shaped connecting and fixing plate is fixed to the fire extinguishing box, the two internal threaded connecting grooves are respectively located on the outer surfaces of the two strip-shaped connecting and fixing plates, and the positions of the two internal threaded connecting grooves respectively correspond to the positions of the two internal threaded through holes, a threaded fixing rod is provided inside the first internal threaded connecting groove and the internal threaded through hole counted from left to right, a threaded fixing rod is also provided inside the second internal threaded connecting groove and the internal threaded through hole counted from left to right, and the synchronous transmission mechanism can synchronously drive the two threaded fixing rods to rotate; A cable connector is fixedly installed on one side of the outer surface of the high-frequency rectifier, and a cable automatic cutting mechanism installed on the full-automatic fire extinguishing treatment mechanism is provided on one side of the cable connector. The cable automatic cutting mechanism includes a gear transmission mechanism and a sawtooth cutting bar. The position of the sawtooth cutting bar corresponds to the position of the cable connector, and the gear transmission mechanism can drive the sawtooth cutting bar to move back and forth in a cycle.

2. The silicon carbide high frequency rectifier according to claim 1, characterized in that: The fully automatic fire extinguishing mechanism also includes two fire sensors, which are respectively fixedly mounted on the outer surfaces of the two connecting plates.

3. The silicon carbide high frequency rectifier according to claim 1, characterized in that: The synchronous transmission mechanism includes a sealing cover, in which a stepper motor is fixedly installed, the stepper motor is electrically connected to the fire sensor, the output shaft of the stepper motor is connected to a transmission shaft via a coupling, a shaft is provided on both sides of the transmission shaft, and the two shafts are connected in series with the transmission shaft via a synchronous chain.

4. The silicon carbide high frequency rectifier according to claim 3, characterized in that: A first bevel transmission gear is provided on the lower fixed sleeve of the outer surface of the rotating shaft, the first bevel transmission gear is meshed with a second bevel transmission gear, the axis of the second bevel transmission gear is connected to a rotating shaft head, and the rotating shaft head is connected to the connecting plate through a roller bearing.

5. The silicon carbide high frequency rectifier according to claim 4, characterized in that: The surface of the rotating shaft head facing the nearest threaded fixing rod is fixedly connected with a square rotating shaft, and the outer side of the top end of the square rotating shaft is provided with a square through hole located in the middle position of the front end surface of the threaded fixing rod.

6. The silicon carbide high frequency rectifier according to claim 5, characterized in that: The inner wall cross-section of the square through hole is a square, the outer surface of the square rotating shaft fits with the inner wall of the square through hole, and the square rotating shaft is slidably connected to the square through hole.

7. The silicon carbide high frequency rectifier according to claim 6, characterized in that: A cylindrical groove located inside the connecting plate is provided on one side of the square through hole, the cylindrical groove is communicated with the inside of the internal threaded through hole, and the inner wall diameter of the cylindrical groove is larger than the cross-sectional diameter of the threaded fixing rod.

8. The silicon carbide high frequency rectifier according to claim 1, characterized in that: The gear transmission mechanism includes a first gear, the first gear meshing with a second gear, the axis of the second gear being connected to a gear shaft, a first bevel gear being fixedly sleeved on one side of the outer surface of the gear shaft, the first bevel gear being meshed with the second bevel gear, the axis of the second bevel gear being connected to a gear transmission shaft, a first transmission gear being fixedly sleeved on one side of the outer surface of the gear transmission shaft, the first transmission gear being meshed with the second transmission gear, and a concave rod being connected to the axis of the second transmission gear, one side of the outer surface of the concave rod being concave, a metal sleeve being provided on a movable sleeve at a middle position of the concave part of the outer surface of the concave rod, a shaft connecting rod being connected to a middle position of the front end surface of the metal sleeve via a shaft, a push rod being connected to a push rod via a shaft, a guide rod being provided on a movable sleeve on one side of the outer surface of the push rod, and the outer surface of the guide rod is fixed to the inner part of the sealing cover.

9. The silicon carbide high frequency rectifier according to claim 8, characterized in that: An insulating strip is fixedly connected to one side of the outer surface of the push rod, the insulating strip is slidably connected to the lower end surface of the sealing cover, and the upper end surface of the sawtooth cutting strip is fixed to the lower end surface of the insulating strip.

10. The silicon carbide high frequency rectifier according to claim 3, characterized in that: A metal cover plate is arranged above the stepper motor and is located on the outer surface of the sealing cover, and the sealing cover and the metal cover plate are fixed by screws.

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