Dry-type transformer

Abstract

A dry-type transformer relates to the technical field of dry-type transformers and comprises an iron core, an upper clamp and a lower clamp are arranged at the upper end and the lower end of the iron core respectively and detachably connected with the iron core, three low-voltage windings sleeve the outer side of the iron core, and high-voltage windings sleeve the outer sides of the low-voltage windings. A plurality of cushion blocks are detachably arranged at the bottom of the upper clamping piece, a plurality of supporting assemblies are arranged at the top of the lower clamping piece, the tops and the bottoms of the low-voltage winding and the high-voltage winding abut against the cushion blocks and the supporting assemblies correspondingly, six tapping taps arranged in a staggered mode are arranged on the outer wall of the high-voltage winding, inserting holes are formed in the ends of the tapping taps, and two supporting U-shaped plates are arranged on the side of the high-voltage winding. The upper ends and the lower ends of the supporting U-shaped plates are detachably connected with the upper clamping piece and the lower clamping piece correspondingly, and a lifting U-shaped plate is arranged between the two supporting U-shaped plates. The problem that the transformation ratio adjusting process of an existing dry-type transformer is complex is solved; and cooling air is not uniformly distributed, so that the heat dissipation effect is poor.

Description

Technical Field

[0001] The present invention relates to the technical field of dry-type transformers, in particular to a dry-type transformer. Background Art

[0002] A dry-type transformer does not use a liquid coolant (such as oil). Instead, its windings and core are exposed directly to air or encapsulated in solid insulating material, relying on the air or solid insulating material for cooling and insulation. Dry-type transformers offer advantages such as fire resistance, explosion resistance, environmental friendliness, and maintenance-free operation. They are suitable for locations requiring high safety standards, such as high-rise buildings, subways, hospitals, and mines. Their insulation grades are typically B, F, or H, offering excellent heat resistance. However, their heat dissipation capacity is weaker than that of oil-immersed transformers, resulting in relatively smaller capacities. They are generally used in medium- and low-voltage distribution systems (10 kV and below).

[0003] The existing dry-type transformers have gradually exposed their shortcomings during use, mainly in the following aspects: First, the dry-type transformer's ratio adjustment process is complex. Specifically, when the grid voltage fluctuates or the load-side voltage demand changes, the dry-type transformer's ratio needs to be adaptively adjusted. The dry-type transformer achieves ratio adjustment by adjusting the connection between the tap and the tap on the high-voltage winding to change the effective number of turns. The high-voltage winding is equipped with six taps. When the tap connects the first tap and the second tap, it is the first gear. When the tap connects the second tap and the third tap, it is the second gear. And so on, the dry-type transformer has a total of five gears. The dry-type transformer has three high-voltage windings. When adjusting the ratio, the three high-voltage windings must be synchronously adjusted to the same gear to ensure three-phase voltage balance. The two ends of the tap are mechanically connected to the tap by bolts. Each adjustment requires first loosening the bolts, moving the tap to the target gear, and then retightening the bolts. This process involves repeated operations at multiple tap points and the operating space is small. Therefore, the dry-type transformer's ratio adjustment process is complicated.

[0004] Second, the cooling air is unevenly distributed and the heat dissipation effect is poor. Specifically, during the operation of the dry-type transformer, heat is generated due to the conductor resistance when the current passes through the winding. The winding adopts a cylindrical structure design, with the low-voltage winding on the inside and the high-voltage winding on the outside. In order to enhance the heat dissipation effect, the dry-type transformer is equipped with a cross-flow fan on the bottom clamp to take away the heat by blowing air upward. In actual operation, due to the obstruction of the high-voltage winding and the low-voltage winding to the airflow, most of the cooling air generated by the cross-flow fan flows to the external area of the high-voltage winding, and only a small amount of air can effectively enter the key heat dissipation channel between the low-voltage winding and the high-voltage winding and the internal area of the low-voltage winding. Therefore, the cooling air is extremely unevenly distributed, resulting in poor heat dissipation effect.

[0005] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Summary of the Invention

[0006] In response to the shortcomings of the prior art, the present invention aims to provide a dry-type transformer that can synchronously adjust the taps on the three high-voltage windings when adjusting the transformation ratio. The operator can complete the coordinated adjustment of multiple taps in a single operation step, which simplifies the overall adjustment process and the transformation ratio adjustment process of the dry-type transformer. By rationally arranging the air ducts and guide structures, the dry-type transformer can evenly deliver airflow to the outside of the high-voltage winding, the inside of the low-voltage winding, and the area between the high and low-voltage windings, ensuring that the heat dissipation air volume is evenly distributed in the key heating parts of the winding, thereby optimizing the heat dissipation effect.

[0007] In order to solve the above problems, the present invention provides the following technical solutions: A dry-type transformer comprises an iron core, wherein the upper and lower ends of the iron core are respectively provided with an upper clamp and a lower clamp, wherein the upper clamp and the lower clamp are both detachably connected to the iron core, three low-voltage windings are sleeved on the outside of the iron core, and a high-voltage winding is sleeved on the outside of the low-voltage winding, a plurality of pads are detachably provided on the bottom of the upper clamp, and a plurality of support assemblies are provided on the top of the lower clamp, wherein the top and bottom of the low-voltage winding and the high-voltage winding are respectively against the pads and the support assemblies, and the outer wall of the high-voltage winding is provided with six staggered taps. A jack is provided at the tap end, and two supporting U-shaped plates are provided on the side of the high-voltage winding. The upper and lower ends of the supporting U-shaped plates are detachably connected to the upper clamp and the lower clamp respectively. A lifting U-shaped plate is provided between the two supporting U-shaped plates, and the lifting U-shaped plate is vertically slidably connected to the two supporting U-shaped plates. A sliding plate is provided for horizontal sliding inside the lifting U-shaped plate, and three rotating plates are provided for rotation at the end of the sliding plate. The three rotating plates are arranged to rotate synchronously, and a tap is fixed at the end of the rotating plate, and two plug rods are fixed at the end of the tap.

[0008] As an optimized solution, the support assembly includes a lower fixed plate detachably connected to the lower clamp, the top of the lower fixed plate is detachably provided with an upper fixed plate, the tops of the upper and lower fixed plates are both penetrated by avoidance holes, the iron core is located in the avoidance holes, the top of the upper fixed plate is provided with two positioning grooves, the bottom ends of the high-voltage winding and the low-voltage winding are respectively located in the two positioning grooves, the top of the lower fixed plate is provided with a ventilation groove, the top of the upper fixed plate is provided with a number of air outlet holes connected to the ventilation grooves at both sides of the positioning grooves, the bottom of the lower fixed plate is detachably provided with a cross-flow fan, the air outlet of the cross-flow fan is connected to the ventilation groove, and a number of support blocks are fixedly provided at the bottom of the ventilation groove.

[0009] As an optimized solution, a high-voltage terminal is installed on the top of the upper clamp, and the high-voltage terminal is connected to the high-voltage winding through a high-voltage connecting rod. The high-voltage connecting rod avoids the lifting U-shaped plate, and a low-voltage outlet copper bus is installed on the low-voltage winding.

[0010] As an optimized solution, the end of the sliding plate is fixed with an external threaded tube, the end of the lifting U-shaped plate is penetrated by a rotating cylinder rotatably connected thereto, and one end of the external threaded tube passes through the rotating cylinder and is threadedly connected to the rotating cylinder.

[0011] As an optimized solution, two connecting plates are provided at the end of the sliding plate, and the upper end and the lower end of the rotating plate are rotatably connected to the two connecting plates respectively.

[0012] As an optimized solution, a rotating rod is fixed at the end of the rotating plate, one end of the rotating rod is rotatably connected to the sliding plate, one of the plug rods at the end of the branch plate is coaxially arranged with the rotating rod, and one end of the rotating rod located in the middle position passes through the sliding plate and the external threaded tube and extends to the outside.

[0013] As an optimized solution, a bolt head structure is provided at the end of the rotating rod.

[0014] As an optimized solution, two limiting plates are fixedly provided at the end of the sliding plate for limiting the rotating plate in the middle position.

[0015] As an optimized solution, a positioning plate is provided at the end of the supporting U-shaped plate, three positioning slots are passed through the end of the supporting U-shaped plate, the positioning plate is inserted into the positioning slots, a pull ring is fixed at the end of the positioning plate, and a handle is fixed at the top of the lifting U-shaped plate.

[0016] As an optimized solution, two bases are provided at the bottom of the lower clamping piece, and the bases are detachably connected to the two lower clamping pieces.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Take the tapping piece to connect the No. 1 and No. 2 tap taps as an example to perform gear shift adjustment. At this time, the transformation ratio of the dry-type transformer is one gear. When the transformation ratio is adjusted to two gears, use a tool to rotate the rotating cylinder, thereby driving the external threaded tube and the sliding plate to move outward until the plug rod is completely out of the socket, and use a tool to rotate the rotating rod in the middle position, thereby driving the rotating plate in the middle position to rotate. Driven by the connecting plate, the other two rotating plates rotate synchronously until the rotating plate in the middle position is against the limit plate. The plug rod originally at the No. 1 tap tap is rotated to the No. 3 tap tap, and the position of the plug rod at the No. 2 tap tap remains unchanged. Use a tool to rotate the rotating cylinder to reset it. The two plug rods of the tapping piece are respectively inserted into the sockets of the No. 2 and No. 3 tap taps. At this time, the transformation ratio of the dry-type transformer is two gears. The above operation process is the first adjustment method. The transformation ratio of the dry-type transformer is adjusted from one gear to three. When shifting, use a tool to rotate the rotating cylinder until the plug rod is completely out of the socket, then hold the handle to lift the lifting U-shaped plate, then pull the positioning plate out of the uppermost positioning slot, and insert it into the positioning slot in the middle position, then lower the lifting U-shaped plate until it contacts the positioning plate, use a tool to rotate the rotating cylinder to reset it, and the two plug rods of the tap are respectively inserted into the sockets of the third and fourth tap taps. At this time, the transformation ratio of the dry-type transformer is three gears. The above operation process is the second adjustment method. The two adjustment methods can be combined to arbitrarily adjust the transformation ratio of the five gears of the dry-type transformer. The dry-type transformer can synchronously adjust the taps on the three high-voltage windings when adjusting the transformation ratio. The operator only needs to complete the coordinated adjustment of multiple taps through a single operation step. The overall adjustment process is simple, which simplifies the transformation ratio adjustment process of the dry-type transformer. 2. The three tapping pieces can realize synchronous rotation through the mechanical linkage structure, ensuring the synchronization and consistency of the position changes of the three tapping pieces. At the same time, the limit plate can limit the rotation angle of the rotating plate, so that the adjustment process does not need to check the position of each tapping piece, which improves practicality and convenience. 3. When the dry-type transformer dissipates heat during operation, the cross-flow fan delivers air to the ventilation slots. The air in the ventilation slots is discharged through the air outlet to the outside of the high-voltage winding, the inside of the low-voltage winding, and the area between the high and low voltage windings. The airflow takes out the heat when passing through the above-mentioned areas, thereby achieving the effect of heat dissipation. By rationally arranging the air ducts and guide structures, the dry-type transformer can evenly deliver air to the outside of the high-voltage winding, the inside of the low-voltage winding, and the area between the high and low voltage windings, ensuring that the heat dissipation air volume is evenly distributed at the key heating parts of the windings, thereby optimizing the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic structural diagram of the front side of the high-voltage winding of the present invention; Figure 3 Schematic diagram of the structure of the iron core of the present invention; Figure 4 It is a structural schematic diagram of the tap of the present invention; Figure 5 This is a schematic diagram of the structure inside the lifting U-shaped plate of the present invention; Figure 6 It is a structural schematic diagram of the end portion of the sliding plate of the present invention; Figure 7 It is a structural schematic diagram of the support assembly of the present invention; Figure 8 This is an exploded view of the support assembly of the present invention; Figure 9 Schematic diagram of the structure of the upper fixing plate and the lower fixing plate of the present invention; Figure 10 This is a schematic structural diagram of the back side of the high-voltage winding of the present invention; Figure 11 This is a schematic diagram of the structure inside the rotating drum of the present invention; Figure 12 It is a structural schematic diagram of the positioning plate and positioning slot of the present invention.

[0020] In the figure: 1- iron core; 2- upper clamp; 3- lower clamp; 4- base; 5- support assembly; 6- support U-shaped plate; 7- spacer; 8- high voltage terminal; 9- high voltage connecting rod; 10- tap; 11- jack; 12- high voltage winding; 13- low voltage winding; 14- sliding plate; 15- lifting U-shaped plate; 16- handle; 17- connecting plate; 18- limit plate; 19- rotating plate; 20- plug rod; 21- tapping piece; 22- rotating cylinder; 23- external threaded pipe; 24- bolt head structure; 25- rotating rod; 26- positioning slot; 27- pull ring; 28- positioning plate; 29- low voltage outlet copper bus; 30- lower fixing plate; 31- upper fixing plate; 32- avoidance hole; 33- cross flow fan; 34- ventilation slot; 35- support block; 36- air outlet hole; 37- positioning slot. DETAILED DESCRIPTION

[0021] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0022] like Figures 1 to 12 As shown, a dry-type transformer includes an iron core 1, the upper end and the lower end of the iron core 1 are respectively provided with an upper clamp 2 and a lower clamp 3, the upper clamp 2 and the lower clamp 3 are both detachably connected to the iron core 1, three low-voltage windings 13 are sleeved on the outside of the iron core 1, and a high-voltage winding 12 is sleeved on the outside of the low-voltage winding 13. The bottom of the upper clamp 2 is detachably provided with a plurality of pads 7, and the top of the lower clamp 3 is provided with a plurality of support assemblies 5. The top and bottom of the low-voltage winding 13 and the high-voltage winding 12 are correspondingly abutted against the pads 7 and the support assemblies 5. The outer wall of the high-voltage winding 12 is provided with six staggered tap taps 10. The tap taps A socket 11 is provided at the end of the head 10, and two supporting U-shaped plates 6 are provided on the side of the high-voltage winding 12. The upper and lower ends of the supporting U-shaped plates 6 are detachably connected to the upper clamp 2 and the lower clamp 3 respectively. A lifting U-shaped plate 15 is provided between the two supporting U-shaped plates 6. The lifting U-shaped plate 15 is vertically slidably connected to the two supporting U-shaped plates 6. A sliding plate 14 is provided for horizontal sliding inside the lifting U-shaped plate 15. Three rotating plates 19 are provided for rotation at the end of the sliding plate 14. The three rotating plates 19 are arranged to rotate synchronously. A tapping piece 21 is fixed to the end of the rotating plate 19, and two plug rods 20 are fixed to the end of the tapping piece 21.

[0023] The support assembly 5 includes a lower fixed plate 30 detachably connected to the lower clamp 3, and an upper fixed plate 31 is detachably provided on the top of the lower fixed plate 30. Avoidance holes 32 are penetrated through the tops of the upper fixed plate 31 and the lower fixed plate 30, and the iron core 1 is located in the avoidance hole 32. Two positioning grooves 37 are provided on the top of the upper fixed plate 31, and the bottom ends of the high-voltage winding 12 and the low-voltage winding 13 are respectively located in the two positioning grooves 37. A ventilation groove 34 is provided on the top of the lower fixed plate 30, and a plurality of air outlet holes 36 connected to the ventilation groove 34 are provided on the top of the upper fixed plate 31 on both sides of the positioning groove 37. A cross-flow fan 33 is detachably provided on the bottom of the lower fixed plate 30, and the air outlet of the cross-flow fan 33 is connected to the ventilation groove 34. A plurality of support blocks 35 are fixedly provided at the bottom of the ventilation groove 34.

[0024] A high-voltage terminal 8 is installed on the top of the upper clamp 2. The high-voltage terminal 8 is connected to the high-voltage winding 12 through a high-voltage connecting rod 9. The high-voltage connecting rod 9 avoids the lifting U-shaped plate 15. A low-voltage outlet copper bus 29 is installed on the low-voltage winding 13.

[0025] An external threaded tube 23 is fixed to the end of the sliding plate 14 , and a rotating cylinder 22 rotatably connected to the end of the lifting U-shaped plate 15 is passed through. One end of the external threaded tube 23 passes through the rotating cylinder 22 and is threadedly connected to the rotating cylinder 22 .

[0026] Two connecting plates 17 are provided at the ends of the sliding plate 14 , and the upper and lower ends of the rotating plate 19 are rotatably connected to the two connecting plates 17 .

[0027] A rotating rod 25 is fixed to the end of the rotating plate 19, one end of the rotating rod 25 is rotatably connected to the sliding plate 14, one of the plug rods 20 at the end of the branch plate 21 is coaxially arranged with the rotating rod 25, and one end of the rotating rod 25 located in the middle position passes through the sliding plate 14 and the external threaded tube 23 and extends to the outside.

[0028] A bolt head structure 24 is provided at the end of the rotating rod 25 .

[0029] Two limiting plates 18 are fixedly provided at the ends of the sliding plate 14 for limiting the position of the rotating plate 19 at the middle position.

[0030] A positioning plate 28 is provided at the end of the supporting U-shaped plate 6. Three positioning slots 26 are provided through the end of the supporting U-shaped plate 6. The positioning plate 28 is inserted into the positioning slots 26. A pull ring 27 is fixed at the end of the positioning plate 28. A handle 16 is fixed at the top of the lifting U-shaped plate 15.

[0031] Two bases 4 are provided at the bottom of the lower clamping piece 3 , and the bases 4 are detachably connected to the two lower clamping pieces 3 .

[0032] The iron core 1 is composed of cold-rolled silicon steel sheets stacked crosswise.

[0033] The three taps 10 on the left side of the high-voltage winding 12 are numbered as one, three, and five from top to bottom, and the three taps 10 on the right side of the high-voltage winding 12 are numbered as two, four, and six from top to bottom.

[0034] The cross section of the insertion hole 11 is a trapezoidal structure, and the insertion rod 20 is arranged in the shape of the insertion hole 11.

[0035] The rotating plate 19 is made of insulating material.

[0036] The working principle of this device is: Take the tapping piece 21 to connect the first and second tapping taps 10 as an example to perform gear shift adjustment. At this time, the transformation ratio of the dry-type transformer is in the first gear. When the transformation ratio is adjusted to the second gear, use a tool to rotate the rotating cylinder 22, thereby driving the external threaded tube 23 and the sliding plate 14 to move outward until the insertion rod 20 is completely out of the insertion hole 11. Use a tool to rotate the rotating rod 25 in the middle position, thereby driving the rotating plate 19 in the middle position to rotate. Driven by the connecting plate 17, the other two rotating plates 19 rotate synchronously. Until the rotating plate 19 in the middle position abuts against the limit plate 18, the plug 20 originally at the No. 1 tap 10 is rotated to the No. 3 tap 10, and the position of the plug 20 at the No. 2 tap 10 remains unchanged. Use a tool to rotate the rotating cylinder 22 to reset it, and the two plugs 20 of the tap plate 21 are respectively inserted into the jacks 11 of the No. 2 and No. 3 tap 10. At this time, the transformation ratio of the dry-type transformer is the second gear. The above operation process is the first adjustment method. The transformation ratio of the dry-type transformer is from the first gear to the When adjusting to the third gear, use a tool to rotate the rotating cylinder 22 until the insertion rod 20 is completely out of the socket 11, then hold the handle 16 to lift the lifting U-shaped plate 15, then pull out the positioning plate 28 from the uppermost positioning slot 26 and insert it into the positioning slot 26 in the middle position, then lower the lifting U-shaped plate 15 until it contacts the positioning plate 28, use a tool to rotate the rotating cylinder 22 to reset it, and the two insertion rods 20 of the tap 21 are respectively inserted into the sockets 11 of the third and fourth tap taps 10. At this time, the transformation ratio of the dry-type transformer is three gears, and the above operation process is the second adjustment method. The two adjustment methods are combined to arbitrarily adjust the transformation ratio of the five gears of the dry-type transformer. The dry-type transformer can synchronously adjust the taps 21 on the three high-voltage windings 12 when adjusting the transformation ratio. The operator only needs to complete the coordinated adjustment of multiple taps 21 through a single operation step. The overall adjustment process is simple, which simplifies the transformation ratio adjustment process of the dry-type transformer; The three tapping pieces 21 can achieve synchronous rotation through a mechanical linkage structure, ensuring the synchronization and consistency of the position changes of the three tapping pieces 21. At the same time, the limit plate 18 can limit the rotation angle of the rotating plate 19, so that the adjustment process does not require the verification of the position of each tapping piece 21, thereby improving practicality and convenience. When the dry-type transformer dissipates heat during operation, the cross-flow fan 33 delivers air to the ventilation slot 34, and the air in the ventilation slot 34 is discharged through the air outlet 36 to the outside of the high-voltage winding 12, the inside of the low-voltage winding 13, and the area between the high-voltage winding 12 and the low-voltage winding 13. The air flow takes out the heat when passing through the above-mentioned area, thereby achieving the effect of heat dissipation. By rationally arranging the air duct and the guide structure, the dry-type transformer can simultaneously evenly deliver air to the outside of the high-voltage winding 12, the inside of the low-voltage winding 13, and the area between the high-voltage winding 12 and the low-voltage winding 13, ensuring that the heat dissipation air volume is evenly distributed at the key heating parts of the winding, thereby optimizing the heat dissipation effect.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A dry-type transformer, characterized in that: The invention comprises an iron core (1), wherein the upper end and the lower end of the iron core (1) are respectively provided with an upper clamp (2) and a lower clamp (3), and the upper clamp (2) and the lower clamp (3) are both detachably connected to the iron core (1). The outer side of the iron core (1) is provided with three low-voltage windings (13), and the outer side of the low-voltage windings (13) is provided with a high-voltage winding (12). The bottom of the upper clamp (2) is detachably provided with a plurality of pads (7), and the top of the lower clamp (3) is provided with a plurality of support assemblies (5). The top and bottom of the low-voltage windings (13) and the high-voltage windings (12) are respectively abutted against the pads (7) and the support assemblies (5). The outer wall of the high-voltage winding (12) is provided with six staggered tapping taps (10), and the tapping taps (10) are provided with a plurality of pads (7). A jack (11) is provided at the end, and two supporting U-shaped plates (6) are provided on the side of the high-voltage winding (12). The upper end and the lower end of the supporting U-shaped plate (6) are detachably connected to the upper clamp (2) and the lower clamp (3) respectively. A lifting U-shaped plate (15) is provided between the two supporting U-shaped plates (6). The lifting U-shaped plate (15) is vertically slidably connected to the two supporting U-shaped plates (6). A sliding plate (14) is provided in the lifting U-shaped plate (15) for horizontal sliding. Three rotating plates (19) are provided at the end of the sliding plate (14). The three rotating plates (19) are synchronously rotated. A tapping plate (21) is fixed at the end of the tapping plate (21). Two plug rods (20) are fixed at the end of the tapping plate (21).

2. A dry-type transformer according to claim 1, characterized in that: The support assembly (5) includes a lower fixing plate (30) detachably connected to the lower clamp (3), an upper fixing plate (31) is detachably provided on the top of the lower fixing plate (30), and avoidance holes (32) are provided through the tops of the upper fixing plate (31) and the lower fixing plate (30), the iron core (1) is located in the avoidance hole (32), and two positioning grooves (37) are provided on the top of the upper fixing plate (31), and the bottom ends of the high-voltage winding (12) and the low-voltage winding (13) are respectively Located in the two positioning grooves (37), the top of the lower fixed plate (30) is provided with a ventilation groove (34), and the top of the upper fixed plate (31) is provided with a plurality of air outlet holes (36) connected to the ventilation groove (34) at positions on both sides of the positioning groove (37). The bottom of the lower fixed plate (30) is detachably provided with a cross-flow fan (33), and the air outlet of the cross-flow fan (33) is connected to the ventilation groove (34). The bottom of the ventilation groove (34) is fixed with a plurality of support blocks (35).

3. The dry-type transformer according to claim 1, characterized in that: A high-voltage terminal (8) is installed on the top of the upper clamp (2), and the high-voltage terminal (8) is connected to the high-voltage winding (12) through a high-voltage connecting rod (9). The high-voltage connecting rod (9) avoids the lifting U-shaped plate (15), and a low-voltage outlet copper bar (29) is installed on the low-voltage winding (13).

4. The dry-type transformer according to claim 1, characterized in that: An external threaded tube (23) is fixedly connected to the end of the sliding plate (14), and a rotating cylinder (22) rotatably connected thereto is passed through the end of the lifting U-shaped plate (15), and one end of the external threaded tube (23) passes through the rotating cylinder (22) and is threadedly connected to the rotating cylinder (22).

5. The dry-type transformer according to claim 4, characterized in that: Two connecting plates (17) are provided at the end of the sliding plate (14), and the upper end and the lower end of the rotating plate (19) are correspondingly rotatably connected to the two connecting plates (17).

6. The dry-type transformer according to claim 5, characterized in that: A rotating rod (25) is fixedly provided at the end of the rotating plate (19), one end of the rotating rod (25) is rotatably connected to the sliding plate (14), one of the insertion rods (20) at the end of the branching piece (21) is coaxially arranged with the rotating rod (25), and one end of the rotating rod (25) located in the middle position passes through the sliding plate (14) and the external threaded tube (23) and extends to the outside.

7. The dry-type transformer according to claim 6, characterized in that: The end of the rotating rod (25) is provided with a bolt head structure (24).

8. The dry-type transformer according to claim 5, characterized in that: Two limiting plates (18) for limiting the position of the rotating plate (19) at the middle position are fixedly provided at the end of the sliding plate (14).

9. The dry-type transformer according to claim 1, characterized in that: A positioning plate (28) is provided at the end of the supporting U-shaped plate (6), three positioning slots (26) are provided through the end of the supporting U-shaped plate (6), the positioning plate (28) is inserted into the positioning slots (26), a pull ring (27) is fixed at the end of the positioning plate (28), and a handle (16) is fixed at the top of the lifting U-shaped plate (15).

10. The dry-type transformer according to claim 1, characterized in that: Two bases (4) are provided at the bottom of the lower clamping piece (3), and the bases (4) are detachably connected to the two lower clamping pieces (3).

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