A dry-type high-voltage high-frequency transformer

Abstract

This application relates to the field of transformer technology, and in particular to a dry-type high-voltage high-frequency transformer, which includes clamping slots arranged opposite each other, an mounting cylinder arranged between the clamping slots, a sliding cylinder coaxially arranged inside the mounting cylinder, a mounting component arranged between the clamping slots and integrally formed with the mounting cylinder, and an electric push rod arranged inside the mounting component. Both ends of the mounting cylinder are closed to form oil storage chambers. The end face of the sliding cylinder protrudes from the end face of the mounting cylinder. A cylindrical piston chamber is opened inside the mounting component. A first flow channel is opened inside the outer wall of the mounting cylinder, and the first flow channel connects the oil storage chamber and the piston chamber. The push rod end of the electric push rod is located inside the piston chamber. A second flow channel is opened inside the mounting cylinder at a distance from the first flow channel, and the second flow channel connects the inner wall of the sliding cylinder and the piston chamber. A piston rod is coaxially slidably arranged inside the sliding cylinder, with one end of the piston rod located inside the sliding cylinder and the other end located outside the sliding cylinder. A force-bearing plate is coaxially fixed to the end face of the piston rod, which achieves the effect of facilitating the inspection or maintenance of the iron core.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and in particular to a dry-type high-voltage high-frequency transformer. Background Technology

[0002] Currently, dry-type high-voltage high-frequency transformers use solid insulating materials as the insulating medium, and their operating frequency is usually in the kHz to MHz range. The output voltage can reach several kilovolts to several hundred kilovolts. They combine the advantages of dry-type transformers, such as oil-free operation, fire and explosion protection, and convenient maintenance, with the characteristics of high-frequency transformers, such as small size and high power density. Compared with traditional oil-immersed power frequency transformers, they have achieved significant improvements in safety and miniaturization.

[0003] In existing dry-type high-voltage high-frequency transformers, the upper and lower sections of the core are fixed by clamps and high-strength bolts and nuts. Through holes are pre-punched or drilled on the core laminations, and insulating bushings are inserted into the holes. At the upper and lower ends of the core, screws pass through the upper and lower clamps and the core, and then nuts and anti-loosening washers are tightened, thereby generating a huge clamping force to press the core tightly.

[0004] The existing technical solutions mentioned above have the following drawbacks: the pre-fabricated through holes in the core laminations require high-precision machining, which increases the difficulty of the production process and manufacturing costs. During the inspection or maintenance of the core, tools such as wrenches are needed to disassemble the bolts one by one, which is cumbersome and inefficient. At the same time, the core is the core of the transformer's closed magnetic circuit. The pre-fabricated through holes on the laminations will destroy the structural integrity of the core, causing local discontinuities in the magnetic circuit. Under high-frequency alternating magnetic fields, this can easily lead to magnetic flux distortion and increased leakage flux. Summary of the Invention

[0005] This application provides a dry-type high-voltage high-frequency transformer to facilitate the inspection or maintenance of the iron core.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: A dry-type high-voltage high-frequency transformer includes clamping slots arranged opposite each other, a mounting cylinder disposed at the end of the outer plate of the web of the clamping slot, a sliding cylinder coaxially disposed within the mounting cylinder, a mounting component disposed between the clamping slots and integrally formed with the mounting cylinder, and an electric push rod disposed within the mounting component. The mounting cylinder is composed of two coaxial and spaced-apart cylinders with flush end faces. The two cylinders form an annular cavity with both ends closed to form an oil storage chamber. The end face of the sliding cylinder protrudes from the end face of the mounting cylinder, and both ends of the sliding cylinder are closed. A cylindrical piston cavity is formed inside the mounting component. A first flow channel is formed inside the outer wall of the mounting cylinder, and the first flow channel connects to... The oil storage chamber and the piston chamber are connected. The push rod end of the electric push rod is located in the piston chamber. A second flow channel is provided in the mounting cylinder at a distance from the first flow channel. The second flow channel connects the inner wall of the sliding cylinder and the piston chamber. A piston rod is slidably arranged coaxially in the sliding cylinder. One end of the piston rod is located in the sliding cylinder, and a force-bearing plate is coaxially fixed to the end face of the piston rod. The other end of the piston rod is located outside the sliding cylinder. A connecting plate is rotatably arranged on the end face of the piston rod outside the sliding cylinder. The end of the piston rod rotatably passes through the connecting plate. A connecting hole is opened at a corresponding position on the web of the clamping groove opposite to the clamping groove on which the mounting cylinder is installed. The connecting hole is adapted to the connecting plate, and the connecting plate can pass through the connecting hole.

[0007] By adopting the above technical solution, and by setting up clamping grooves, mounting cylinders, sliding cylinders, mounting components, electric push rods, connecting plates, and connecting holes, along with the oil storage chamber formed by the mounting cylinder, the first and second flow channels, and the piston rod and the force-bearing plate on the piston rod end face inside the sliding cylinder, hydraulic oil can be pushed by the electric push rod to flow between the oil storage chamber, piston chamber, and sliding cylinder. Hydraulic power drives the piston rod to move, achieving mutual approach and clamping of the paired clamping grooves. This replaces the traditional bolt and nut method of core fixing, reducing disassembly steps during core inspection and maintenance, improving the efficiency of core assembly and disassembly, and the double-cylinder structure of the mounting cylinder can form a closed system. The oil reservoir provides a stable medium-containing space for hydraulic transmission. The design of the sliding cylinder end face protruding from the mounting cylinder provides sufficient stroke for the piston rod to slide, meeting the clamping adjustment requirements of the clamping slot. The connecting plate passes through the connecting hole to connect the piston rod to the clamping slot on the other side, enabling the hydraulically driven piston rod power to be transmitted to the paired clamping slots, driving the clamping slots on both sides to move closer synchronously to complete the iron core clamping. Furthermore, the rotational cooperation design of the piston rod and the connecting plate allows the position of the connecting plate to be adjusted by rotation after the connecting plate passes through the connecting hole, realizing the quick engagement of the piston rod and the clamping slot, improving the connection efficiency of the clamping structure and the clamping slot, and adapting to the clamping action requirements of hydraulic drive.

[0008] Optionally, the closed end of the sliding cylinder has a circular hole that fits the peripheral wall of the piston rod. The closed end of the sliding cylinder is sleeved on the peripheral wall of the piston rod through the circular hole. The hole wall, the peripheral wall of the force plate, and the peripheral wall of the push rod end of the electric push rod are all coaxially sleeved with sealing rings.

[0009] By adopting the above technical solution and setting a sealing ring, the piston rod can slide smoothly in the sliding cylinder while sealing the connection between the piston chamber and the oil storage chamber, the sliding cylinder, and the mating point between the sliding cylinder and the piston rod. This reduces hydraulic oil leakage during transmission, improves the sealing performance and power transmission efficiency of the hydraulic transmission, and allows the power of the electric push rod to be transmitted to the piston rod more stably through the hydraulic oil, ensuring stable clamping force of the clamping groove.

[0010] Optionally, a one-way valve is provided in both the first flow channel and the second flow channel.

[0011] By adopting the above technical solution and setting a one-way valve, the flow direction of hydraulic oil in the flow channel can be unidirectionally restricted, so that the hydraulic oil in the oil storage chamber can only flow into the piston chamber through the first flow channel, and the hydraulic oil in the piston chamber can only flow into the sliding cylinder through the second flow channel, forming a one-way hydraulic oil transmission path. With the reciprocating pushing action of the electric push rod, the hydraulic oil is gradually pressed into the sliding cylinder to push the piston rod to move, so as to realize the slow and stable clamping of the clamping groove, improve the stability of the iron core clamping, and avoid structural damage to the iron core caused by a sudden increase in clamping force.

[0012] Optionally, an unlocking pipe is provided outside the mounting cylinder, the unlocking pipe connects the inner wall of the sliding cylinder and the oil storage chamber, and a controllable one-way valve is provided inside the unlocking pipe.

[0013] By adopting the above technical solution and setting an unlocking pipe, when it is necessary to disassemble the clamping slot, the single-way valve can be opened to allow the hydraulic oil in the sliding cylinder to flow back to the oil storage chamber through the unlocking pipe, thereby realizing the unlocking of the hydraulic transmission and allowing the clamping slots to separate from each other, completing the disassembly of the iron core. Compared with the traditional bolt disassembly method, this improves the unlocking efficiency during iron core inspection and maintenance. In addition, the design of the unlocking pipe connecting the sliding cylinder and the oil storage chamber enables the recycling of hydraulic oil, reduces the waste of hydraulic oil, and adapts to the cyclic action requirements of hydraulic clamping and unlocking.

[0014] Optionally, the transformer also includes an iron core disposed between clamping slots, a low-voltage winding and a high-voltage winding spaced apart on the iron core. The iron core consists of horizontal columns spaced apart vertically and three vertical columns spaced evenly between two of the horizontal columns. Both the horizontal columns and the vertical columns are made of laminated silicon steel sheets that have undergone insulation treatment. The horizontal columns and the vertical columns are integrally formed. The low-voltage winding, which is cylindrical, is coaxially sleeved on the periphery of each of the three vertical columns. The high-voltage winding is coaxially sleeved on the outer periphery of the low-voltage winding and spaced apart from the low-voltage winding. The two end faces of the high-voltage winding are flush with the two end faces of the low-voltage winding.

[0015] By adopting the above technical solution, and by setting up an iron core composed of horizontal and vertical columns, combined with the integrated structure design of insulated silicon steel sheets for the horizontal and vertical columns, and the low-voltage winding coaxially sleeved on the vertical columns and the high-voltage winding coaxially sleeved around the low-voltage winding, the iron core can form a magnetic circuit structure adapted to the three-phase winding. The design of the three vertical columns can each be used to install the low-voltage winding, meeting the winding installation requirements of high-frequency high-voltage transformers. The method of stacking and insulating silicon steel sheets can reduce the magnetic loss of the iron core under high-frequency alternating magnetic field, improving the energy conversion efficiency of the transformer. The design of the low-voltage winding and the high-voltage winding being spaced apart and having flush end faces can ensure the insulation distance between the high and low voltage windings, while making the magnetic field coupling of the windings more uniform and improving the stability of voltage transformation.

[0016] Optionally, the web of the clamping groove is square and has multiple sets of adjustment holes. The adjustment holes are waist-shaped, and each set of adjustment holes has four holes. The web of the clamping groove between the two vertical columns has a set of adjustment holes. The adjustment holes connect the inside and outside of the clamping groove. A positioning plate is provided between the clamping grooves that are arranged opposite each other. The positioning plate is horizontal and its sidewall is connected to the clamping groove by bolts and adjustment holes. A pair of positioning plates with opposite plate surfaces are connected to a set of adjustment holes.

[0017] By adopting the above technical solution, and by setting adjustment holes and positioning plates, and by using bolted connections between the positioning plates and the clamping slots, the initial positioning of the spacing and relative position between the pairs of clamping slots can be achieved by adjusting the installation position of the positioning plates in the waist-shaped adjustment holes. This allows the clamping slots to be accurately aligned with the horizontal column of the iron core, improving the installation alignment efficiency between the clamping slots and the iron core. Furthermore, the design of each set of adjustment holes paired with a pair of opposing positioning plates can limit the clamping slots from both sides, making the position of the clamping slots more stable and providing a precise basic positioning for subsequent hydraulic clamping.

[0018] Optionally, a cooling structure is provided between the low-voltage winding and the high-voltage winding. The cooling structure includes an inlet pipe disposed in a clamping slot on one side of the horizontal column, an outlet pipe disposed in a clamping slot on the other side of the horizontal column, and a cooling pipe disposed between the low-voltage winding and the high-voltage winding. Multiple cooling pipes are disposed between the low-voltage winding and the high-voltage winding. One end of the cooling pipe is connected to the inlet pipe, and the other end of the cooling pipe is connected to the outlet pipe.

[0019] By adopting the above technical solution and setting up a cooling structure, which includes an inlet pipe, an outlet pipe, and cooling pipes, and the cooling pipes are connected to the inlet and outlet pipes, the cooling water can be diverted from the inlet pipe to multiple cooling pipes, flowing through the gap between the high and low voltage windings, carrying away the heat generated during the operation of the windings, and then flowing out through the outlet pipe, thus achieving water cooling heat dissipation for the high and low voltage windings. The setting of multiple cooling pipes can increase the contact area between the cooling water and the windings, improve the heat dissipation efficiency, adapt to the high heat generation characteristics of the high frequency high voltage transformer windings, and maintain the windings at a suitable operating temperature.

[0020] Optionally, the cooling pipe is serpentine with multiple bends in the pipeline between the low-voltage winding and the high-voltage winding.

[0021] By adopting the above technical solution and setting up serpentine cooling pipes, the length of the cooling pipes between the low-voltage winding and the high-voltage winding can be increased, further increasing the heat exchange area between the cooling water and the winding. This allows the cooling water to absorb the heat generated by the winding more fully when flowing through the cooling pipes, improving the water cooling effect. At the same time, the serpentine pipe design allows the cooling pipes to be arranged reasonably within the limited gap between the high and low voltage windings, making full use of the space between the windings without affecting the magnetic field coupling and insulation performance of the windings.

[0022] Optionally, the inner and outer peripheral walls of the bend in the cooling pipe are both treated with a rounded transition.

[0023] By adopting the above technical solution and setting the inner and outer peripheral walls of the cooling pipe bend with a rounded transition, the flow resistance of cooling water at the bend can be reduced, allowing the cooling water to flow more smoothly in the serpentine cooling pipe, increasing the circulation speed of the cooling water, enabling hot water to flow out faster after heat dissipation, and low-temperature cooling water to flow in faster, thereby improving the overall cooling cycle efficiency. At the same time, the rounded transition design can prevent cracking due to stress concentration at the bend of the cooling pipe, improve the structural strength of the cooling pipe, extend the service life of the cooling pipe, and reduce the maintenance frequency of the cooling structure.

[0024] In summary, this application has the following technical effects: 1. By incorporating clamping grooves, mounting cylinders, sliding cylinders, mounting components, electric push rods, connecting plates, and connecting holes, along with the oil storage chamber formed by the mounting cylinder, the first and second flow channels, and the piston rod and the force-bearing plate on the piston rod end face within the sliding cylinder, hydraulic oil can be propelled by the electric push rod to flow between the oil storage chamber, piston chamber, and sliding cylinder. Hydraulic power drives the piston rod to move, achieving mutual approach and clamping of the paired clamping grooves. This replaces the traditional bolt and nut method of core fixing, reducing disassembly steps during core inspection and maintenance, and improving the efficiency of core assembly and disassembly. Simultaneously, the double-cylinder structure of the mounting cylinder forms a closed oil storage chamber. To provide a stable medium-containing space for hydraulic transmission, the design of the sliding cylinder end face protruding from the mounting cylinder provides sufficient stroke for the piston rod to slide, meeting the clamping adjustment requirements of the clamping slot. The connecting plate passes through the connecting hole to connect the piston rod to the clamping slot on the other side, enabling the hydraulically driven piston rod power to be transmitted to the paired clamping slots, driving the clamping slots on both sides to move closer synchronously to complete the iron core clamping. In addition, the rotational cooperation design of the piston rod and the connecting plate allows the position of the connecting plate to be adjusted by rotation after the connecting plate passes through the connecting hole, realizing the quick engagement of the piston rod and the clamping slot, improving the connection efficiency of the clamping structure and the clamping slot, and adapting to the clamping action requirements of hydraulic drive. 2. By setting a connecting plate and a connecting hole, the connecting plate can pass through the connecting hole to connect the piston rod to the clamping slot on the other side. This allows the power of the hydraulically driven piston rod to be transmitted to the paired clamping slots, causing the clamping slots on both sides to move closer together to complete the clamping of the iron core. Furthermore, the rotational cooperation design between the piston rod and the connecting plate allows the position of the connecting plate to be adjusted by rotating it after it passes through the connecting hole, achieving quick engagement between the piston rod and the clamping slot. This improves the connection efficiency between the clamping structure and the clamping slot and adapts to the clamping action requirements of hydraulically driven operation. 3. By setting up a cooling structure, which includes an inlet pipe, an outlet pipe, and cooling pipes, the cooling pipes are connected to the inlet and outlet pipes. This allows cooling water to be diverted from the inlet pipe to multiple cooling pipes, flowing through the gap between the high and low voltage windings, carrying away the heat generated during winding operation, and then flowing out through the outlet pipe. This achieves water cooling of the high and low voltage windings. The multiple cooling pipes increase the contact area between the cooling water and the windings, improving heat dissipation efficiency, adapting to the high heat generation characteristics of the high-frequency high-voltage transformer windings, and maintaining the windings at a suitable operating temperature. Attached Figure Description

[0025] Figure 1 This is a structural diagram of the object of this application; Figure 2 This is another perspective of the external structure of this application; Figure 3 This is a structural diagram of the high-voltage winding in this application; Figure 4 This is a structural diagram of the iron core and clamping groove of this application; Figure 5This is a structural diagram of the clamping component of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Transformer body; 11. Base; 12. Iron core; 121. Horizontal column; 122. Vertical column; 13. Clamping slot; 131. Adjustment hole; 132. Connection hole; 14. Low-voltage winding; 15. High-voltage winding; 16. Insulating pad; 17. Cooling fan; 2. Cooling structure; 21. Water inlet pipe; 22. Water outlet pipe; 23. Cooling pipe; 24. Cooling radiator; 25. Water storage tank; 26. Water pump; 3. Clamping structure; 31. Positioning plate; 32. Mounting cylinder; 321. Oil storage chamber; 322. First flow channel; 323. Second flow channel; 33. Sliding cylinder; 331. Piston rod; 332. Force plate; 333. Connecting plate; 34. One-way valve; 35. Unlocking pipe; 36. Mounting component; 361. Piston chamber; 362. Electric push rod; 37. Sealing ring. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the accompanying drawings.

[0028] This application discloses a dry-type high-voltage high-frequency transformer, referring to... Figure 1 The transformer includes a transformer body 1, a cooling structure 2 installed on the transformer body 1, and a clamping structure 3. The clamping structure 3 can quickly clamp and install the upper and lower ends of the iron core 12 in a detachable manner, which facilitates subsequent inspection and maintenance of the transformer iron core 12 after long-term use.

[0029] Reference Figure 1 , Figure 2 and Figure 4 The transformer body 1 includes a horizontally arranged base 11, a pair of clamping slots 13 arranged on the upper part of the base 11, an iron core 12 arranged between the clamping slots 13, a low-voltage winding 14 and a high-voltage winding 15 spaced apart on the iron core 12, and an insulating pad 16 arranged between the high-voltage winding 15 and the clamping slots 13. The base 11 is strip-shaped and has two slots spaced apart. The length direction of the clamping slots 13 is perpendicular to the length direction of the base 11, and the slot openings of a pair of clamping slots 13 are arranged opposite to each other. The iron core 12 consists of horizontal columns 121 spaced apart vertically and three vertical columns 122 evenly spaced between two horizontal columns 121. The horizontal columns 121 and the vertical columns 122 are both made of laminated silicon steel sheets that have undergone insulation treatment, and the horizontal columns 121 and the vertical columns 122 are integrally formed.

[0030] Reference Figure 1 , Figure 2 and Figure 4Each of the two horizontal columns 121 has a pair of clamping grooves 13 on both sides, which clamp and fix the horizontal columns 121. The wing plate of the clamping groove 13 at the lower part is fixed to the base 11. Each of the three vertical columns 122 has a cylindrical low-voltage winding 14 sleeved on its periphery. The low-voltage winding 14 is coaxially arranged with the vertical column 122. Both ends of the low-voltage winding 14 are spaced from the horizontal column 121. An insulating pad 16 is provided between the two end faces of the low-voltage winding 14 and the clamping groove 13. The insulating pad 16 fills the gap between the low-voltage winding 14 and the clamping groove 13, which can fix the low-voltage winding 14. The high-voltage winding 15 is coaxially sleeved on the outer peripheral wall of the low-voltage winding 14 and spaced apart from the low-voltage winding 14. The two end faces of the high-voltage winding 15 are flush with the two end faces of the low-voltage winding 14. An insulating pad 16 is provided between the end face of the high-voltage winding 15 and the clamping groove 13. The insulating pad 16 between the low-voltage winding 14 and the clamping groove 13 and the insulating pad 16 between the high-voltage winding 15 and the clamping groove 13 are integrally formed. Four insulating pads 16 are provided at the ends of the low-voltage winding 14 or the high-voltage winding 15, and the four insulating pads 16 are distributed in a cross shape.

[0031] Reference Figure 1 , Figure 2 and Figure 4 A square column-shaped cooling fan 17 is provided on the upper surface of the base 11. The length direction of the cooling fan 17 is parallel to the length direction of the clamping groove 13. Cooling fans 17 are provided on both sides of the base 11 opposite to the clamping groove 13. The cooling fan 17 exhausts air from the upper side wall and is directed toward the gap between the low voltage winding 14 and the high voltage winding 15.

[0032] Combination Figures 1 to 3 The cooling structure 2 includes an inlet pipe 21 disposed in a clamping groove 13 on one side of the horizontal column 121, an outlet pipe 22 disposed in a clamping groove 13 on the other side of the horizontal column 121, a cooling pipe 23 disposed between the low-voltage winding 14 and the high-voltage winding 15, a cooling radiator 24 vertically disposed at the end of the clamping groove 13, a water storage tank 25 disposed on the side of the cooling radiator 24 away from the clamping groove 13, and a water pump 26 disposed in the water storage tank 25. The length direction of the inlet pipe 21 and the outlet pipe 22 is parallel to the length direction of the clamping groove 13 within the clamping groove 13, and the peripheral walls of the inlet pipe 21 and the outlet pipe 22 are spaced apart from the inner wall of the clamping groove 13.

[0033] Combination Figures 1 to 3Multiple cooling pipes 23 are provided between the low-voltage winding 14 and the high-voltage winding 15. One end of the cooling pipe 23 is connected to the water inlet pipe 21, and the other end of the cooling pipe 23 is connected to the water outlet pipe 22. The cooling pipe 23 between the low-voltage winding 14 and the high-voltage winding 15 is bent into a serpentine shape, and the inner and outer peripheral walls of the bends are treated with arc transition. Multiple cooling pipes 23 surround the outer peripheral wall of the low-voltage winding 14. The peripheral wall of the cooling pipe 23 is spaced apart from the outer peripheral wall of the low-voltage winding 14 and the inner peripheral wall of the high-voltage winding 15. A cooling pipe 23 is provided between two adjacent insulating pads 16.

[0034] Combination Figures 1 to 3 The radiator 24 is strip-shaped, and its surface is perpendicular to the length of the clamping groove 13. The ends of the inlet pipe 21 and outlet pipe 22 furthest from the radiator 24 are closed, and these ends are connected to the interior of the water storage tank 25. The radiator 24 consists of a mounting frame and multiple heat dissipation fins evenly spaced within the frame. The outlet pipe 22 passes through the radiator 24, and the heat dissipation fins are fitted onto the outer periphery of the outlet pipe 22 and integrally formed with it. The outlet pipe 22's internal path within the radiator 24 is bent into a serpentine shape. The water pump 26 is connected to the end of the inlet pipe 21.

[0035] Combination Figures 1 to 3 The air blown by the cooling fan 17 passes between the low-voltage winding 14 and the high-voltage winding 15, dissipating heat from both windings and the cooling pipes 23. The water pump 26 pumps the cooling water from the storage tank 25 into the inlet pipe 21, from which it is distributed into multiple cooling pipes 23. The cooling water flowing through the cooling pipes 23 carries away the heat generated during operation between the low-voltage winding 14 and the high-voltage winding 15, causing the cooling water to heat up. The cooling water in the multiple cooling pipes 23 flows into the outlet pipe 22. As it flows through the outlet pipe 22 of the radiator 24, it transfers heat into the heat dissipation fins. Multiple fans are evenly distributed on the surface of the radiator 24, dissipating heat from the heat dissipation fins and thus cooling the heated cooling water. The cooled water then flows back into the storage tank 25 to complete the circulation.

[0036] Combination Figures 1 to 3 The clamping structure 3 includes a positioning plate 31 disposed between a pair of clamping slots 13, a mounting cylinder 32 disposed between a pair of clamping slots 13, a sliding cylinder 33 disposed within the mounting cylinder 32, a mounting component 36 disposed between the pair of clamping slots 13 and integrally formed with the mounting cylinder 32, and an electric push rod 362 disposed within the mounting component 36. The mounting cylinder 32 is composed of two coaxial and spaced-apart cylinders, with the two end faces of the two cylinders being flush. The two ends of the two cylinders are closed to form an oil storage cavity 321. The end face of the mounting cylinder 32 is fixed to the outer wall of the web of one side of the clamping slot 13. The axis of the mounting cylinder 32 is perpendicular to the web surface of the clamping slot 13. The mounting cylinder 32 is spaced apart from the iron core 12.

[0037] Reference Figure 1 , Figure 4 and Figure 5 The sliding cylinder 33 is disposed inside the mounting cylinder 32, and is coaxially arranged with the mounting cylinder 32. The sliding cylinder 33 and the mounting cylinder 32 are integrally formed, and the end face of the sliding cylinder 33 protrudes from the end face of the mounting cylinder 32. Both ends of the sliding cylinder 33 are closed. The mounting component 36 is disposed on the side of the mounting cylinder 32 away from the iron core 12. The mounting component 36 is L-shaped, and a cylindrical piston cavity 361 is opened inside the mounting component 36. The axis of the piston cavity 361 is parallel to the axis of the mounting cylinder 32. The piston cavity 361 is away from the mounting cylinder 32 and close to the clamping groove 13. The web of the clamping groove 13 is square and has multiple sets of adjustment holes 131. The adjustment holes 131 are waist-shaped, and their length direction is perpendicular to the length direction of the clamping groove 13. Each set of adjustment holes 131 has four holes. The web of the clamping groove 13 between the two vertical columns 122 has a set of adjustment holes 131, and the adjustment holes 131 connect the inside and outside of the clamping groove 13. The positioning plate 31 is a square plate with a horizontal surface. The side wall of the positioning plate 31 is connected to the clamping groove 13 by bolts and adjustment holes 131. A pair of positioning plates 31 with opposite plate surfaces are connected by a set of adjustment holes 131. When the clamping groove 13 is installed, the positioning plate 31 performs preliminary positioning of the clamping groove 13 and the horizontal column 121.

[0038] Reference Figure 1 , Figure 4 and Figure 5 The outer wall of the mounting cylinder 32 has a first flow channel 322, which connects the oil storage chamber 321 and the piston chamber 361. A one-way valve 34 is installed in the first flow channel 322, allowing only the hydraulic oil in the oil storage chamber 321 to flow into the piston chamber 361. An electric push rod 362 is installed in the mounting component 36. The end of the push rod of the electric push rod 362 is located in the piston chamber 361, and the push rod of the electric push rod 362 is coaxially arranged with the piston chamber 361. A sealing ring 37 is coaxially sleeved on the peripheral wall of the push rod end of the electric push rod 362, and the sealing ring 37 seals the sliding connection between the peripheral wall of the push rod of the electric push rod 362 and the wall of the piston chamber 361.

[0039] Reference Figure 1 , Figure 4 and Figure 5 The first flow channel 322 is connected to the piston chamber 361 at a distance away from the electric push rod 362. A second flow channel 323 is provided on the end face of the mounting cylinder 32 and inside the outer cylinder wall. The second flow channel 323 is spaced apart from the first flow channel 322. The second flow channel 323 connects the inner wall of the sliding cylinder 33 and the piston chamber 361. The connection between the second flow channel 323 and the piston chamber 361 is away from the electric push rod 362. A one-way valve 34 is provided in the second flow channel 323, which only allows hydraulic oil to flow from the piston chamber 361 into the sliding cylinder 33. The connection between the second flow channel 323 and the inner wall of the sliding cylinder 33 is away from the mounting cylinder 32.

[0040] Reference Figure 1 , Figure 4 and Figure 5 A piston rod 331 is coaxially slidably disposed inside the sliding cylinder 33. The piston rod 331 is coaxially disposed with the sliding cylinder 33. The closed end of the sliding cylinder 33 away from the mounting cylinder 32 has a circular hole that fits the peripheral wall of the piston rod 331. The closed end of the sliding cylinder 33 is fitted onto the peripheral wall of the piston rod 331 through the circular hole. A sealing ring 37 is coaxially disposed on the wall of the circular hole, sealing the sliding connection between the closed end of the sliding cylinder 33 and the peripheral wall of the piston rod 331. One end of the piston rod 331 is located inside the sliding cylinder 33, and the other end is located outside the sliding cylinder 33. A force-bearing plate 332 is also disposed inside the sliding cylinder 33. The force-bearing plate 332 is a circular plate, and its surface is coaxially fixed to the end face of the piston rod 331. A sealing ring 37 is disposed on the peripheral wall of the force-bearing plate 332, sealing the sliding connection between the force-bearing plate 332 and the inner wall of the sliding cylinder 33.

[0041] Reference Figure 1 , Figure 4 and Figure 5 An unlocking pipe 35 is provided outside the mounting cylinder 32. The unlocking pipe 35 connects the inner wall of the sliding cylinder 33 to the oil storage chamber 321. A controllable one-way valve is provided inside the unlocking pipe 35, which allows hydraulic oil in the sliding cylinder 33 to flow into the oil storage chamber 321 to complete the circulation. A connecting plate 333 is rotatably provided on the end face of the piston rod 331 outside the sliding cylinder 33. The connecting plate 333 is strip-shaped, and its surface is perpendicular to the axis of the piston rod 331. The end of the piston rod 331 rotates and passes through the connecting plate 333.

[0042] Reference Figure 1 , Figure 4 and Figure 5 A connecting hole 132 is provided at a corresponding position on the web of the clamping groove 13, which is opposite to the clamping groove 13 on which the mounting cylinder 32 is installed. The connecting hole 132 is adapted to the connecting plate 333, and the connecting plate 333 can pass through the connecting hole 132. The length direction of the connecting hole 132 is parallel to the length direction of the clamping groove 13. When the clamping groove 13 clamps and fixes the horizontal column 121, the position of the clamping groove 13 is positioned by the positioning plate 31. The connecting plate 333 passes through the connecting hole 132 and is located in the clamping groove 13. By rotating the connecting plate 333, the piston rod 331 is connected to the clamping groove 13. The pushing rod of the electric push rod 362 reciprocates in the piston cavity 361. Each time it reciprocates, the hydraulic oil in the oil storage cavity 321 flows into the piston cavity 361 from the first flow channel 322 and flows into the sliding cylinder 33 along the second flow channel 323 under the action of the pushing rod of the electric push rod 362. This acts on the surface of the force plate 332, causing the piston rod 331 to move, so that the two clamping grooves 13 in pairs move closer to each other, thus clamping and fixing the horizontal column 121.

[0043] Reference Figure 1, Figure 4 and Figure 5 When inspecting and repairing the iron core 12, low-voltage winding 14 and high-voltage winding 15, open the one-way valve in the unlocking pipe 35 to allow hydraulic oil to enter the oil storage chamber 321 and unlock the clamping groove 13. This method is more efficient than bolt-connected clamping groove 13.

[0044] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A dry-type high-voltage high-frequency transformer, characterized in that: The system includes a clamping groove (13) arranged opposite to each other, a mounting cylinder (32) disposed at the end of the outer plate of the web of the clamping groove (13), a sliding cylinder (33) coaxially disposed within the mounting cylinder (32), a mounting component (36) disposed between the clamping grooves (13) and integrally formed with the mounting cylinder (32), and an electric push rod (362) disposed within the mounting component (36). The mounting cylinder (32) is composed of two coaxial and spaced cylinders, with the two end faces of the two cylinders being flush. The two ends of the annular cylinders are closed to form an oil storage cavity (321). The end face of the sliding cylinder (33) protrudes from the end face of the mounting cylinder (32). The two ends of the sliding cylinder (33) are closed. A cylindrical piston cavity (361) is opened inside the mounting component (36). A first flow channel (322) is opened inside the outer wall of the mounting cylinder (32). The first flow channel (322) connects the oil storage cavity (321) and the piston cavity (361). The push rod end of the electric push rod (362) The piston is located in the piston chamber (361). A second flow channel (323) is provided in the mounting cylinder (32) at a distance from the first flow channel (322). The second flow channel (323) connects the inner wall of the sliding cylinder (33) and the piston chamber (361). A piston rod (331) is slidably mounted coaxially in the sliding cylinder (33). One end of the piston rod (331) is located in the sliding cylinder (33), and a force-bearing plate (332) is coaxially fixed to the end face of the piston rod (331). The other end of the piston rod (331) Located outside the sliding cylinder (33), the piston rod (331) is rotatably provided with a connecting plate (333) on its end face outside the sliding cylinder (33). The end of the piston rod (331) is rotatably inserted into the connecting plate (333). A connecting hole (132) is provided at the corresponding position of the web of the clamping groove (13) opposite to the clamping groove (13) on which the mounting cylinder (32) is installed. The connecting hole (132) is adapted to the connecting plate (333), and the connecting plate (333) can pass through the connecting hole (132).

2. A dry-type high-voltage high-frequency transformer according to claim 1, characterized in that: The closed end of the sliding cylinder (33) is provided with a circular hole that is adapted to the peripheral wall of the piston rod (331). The closed end of the sliding cylinder (33) is sleeved on the peripheral wall of the piston rod (331) through the circular hole. The circular hole wall, the peripheral wall of the force plate (332) and the peripheral wall of the push rod end of the electric push rod (362) are all coaxially sleeved with sealing rings (37).

3. A dry-type high-voltage high-frequency transformer according to claim 2, characterized in that: One-way valves (34) are provided in both the first flow channel (322) and the second flow channel (323).

4. A dry-type high-voltage high-frequency transformer according to claim 3, characterized in that: An unlocking pipe (35) is provided outside the mounting cylinder (32). The unlocking pipe (35) connects the inner wall of the sliding cylinder (33) with the oil storage chamber (321). A controllable one-way valve is provided inside the unlocking pipe (35).

5. A dry-type high-voltage high-frequency transformer according to claim 1, characterized in that: The transformer also includes an iron core (12) disposed between clamping slots (13), a low-voltage winding (14) and a high-voltage winding (15) spaced on the iron core (12). The iron core (12) is composed of horizontal columns (121) spaced apart vertically and three vertical columns (122) spaced evenly between two horizontal columns (121). Both the horizontal columns (121) and the vertical columns (122) are made of laminated silicon steel sheets that have been insulated. The horizontal columns (121) and the vertical columns (122) are integrally formed. The three vertical columns (122) are all coaxially fitted with cylindrical low-voltage windings (14) on their periphery. The high-voltage windings (15) are coaxially fitted on the outer periphery of the low-voltage windings (14) and spaced apart from the low-voltage windings (14). The two end faces of the high-voltage windings (15) are flush with the two end faces of the low-voltage windings (14).

6. A dry-type high-voltage high-frequency transformer according to claim 5, characterized in that: The web of the clamping groove (13) is square and has multiple sets of adjustment holes (131). The adjustment holes (131) are waist-shaped, and each set of adjustment holes (131) has four holes. The web of the clamping groove (13) between the two vertical columns (122) has a set of adjustment holes (131). The adjustment holes (131) connect the inside and outside of the clamping groove (13). A positioning plate (31) is provided between the clamping grooves (13) that are arranged opposite to each other. The positioning plate (31) is horizontal, and the side wall of the positioning plate (31) is connected to the clamping groove (13) by bolts and adjustment holes (131). A pair of positioning plates (31) with opposite sides are connected to a set of adjustment holes (131).

7. A dry-type high-voltage high-frequency transformer according to claim 6, characterized in that: A cooling structure (2) is provided between the low-voltage winding (14) and the high-voltage winding (15). The cooling structure (2) includes an inlet pipe (21) provided in the clamping groove (13) on one side of the horizontal column (121), an outlet pipe (22) provided in the clamping groove (13) on the other side of the horizontal column (121), and a cooling pipe (23) provided between the low-voltage winding (14) and the high-voltage winding (15). Multiple cooling pipes (23) are provided between the low-voltage winding (14) and the high-voltage winding (15). One end of the cooling pipe (23) is connected to the inlet pipe (21), and the other end of the cooling pipe (23) is connected to the outlet pipe (22).

8. A dry-type high-voltage high-frequency transformer according to claim 7, characterized in that: The cooling pipe (23) is serpentine in shape with multiple bends in the pipeline between the low-voltage winding (14) and the high-voltage winding (15).

9. A dry-type high-voltage high-frequency transformer according to claim 8, characterized in that: The inner and outer circumferential walls of the bend in the cooling pipe (23) are both treated with arc transition.

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