Energy-saving dry-type transformer

Abstract

The application relates to the technical field of transformers, and discloses an energy-saving dry-type transformer which comprises a transformer body, the transformer body is provided with a high-voltage winding, two groups of blocking hole groups are arranged on the high-voltage winding, each group of blocking hole groups comprises three blocking holes arranged in a regular triangle on the circumferential surface of the high-voltage winding, the two groups of blocking hole groups jointly define five voltage regulating blocking positions, the spacing between two adjacent blocking holes is consistent, and the energy-saving dry-type transformer further comprises a regulating unit; during operation, only the input shaft of a distributor needs to be rotated, two conductive columns can be synchronously and accurately inserted into or withdrawn from corresponding blocking holes through linkage members, and the electrical connection with the high-voltage winding coil tap is completed. The structure discards the traditional bolt connection mode, significantly simplifies the operation process, saves time and effort, is especially suitable for the quick regulating demand in the test process, and effectively improves the test efficiency and production progress.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer, in particular to an energy-saving dry-type transformer. BACKGROUND

[0002] In the field of power equipment, dry-type transformer as an important power transmission and distribution equipment is widely used in various power distribution systems. The dry-type transformer in the prior art is usually designed with voltage regulating tap on the high voltage side, and the voltage regulating function is realized by connecting the tap at different positions with a shorting piece. Generally, the dry-type transformer is provided with five voltage regulating positions, and the output voltage is adjusted by shorting the tap at different positions with the shorting piece to change the effective number of turns of the coil. For example, patent No. CN202058560U- dry-type transformer high voltage tap lead structure. However, the traditional operation mode needs to connect the shorting piece at different positions of the tap with bolts, and for the six hole positions usually provided, the operation of assembling and disassembling the bolts is needed each time the position is adjusted. This cumbersome operation mode is time-consuming and laborious. Therefore, an energy-saving dry-type transformer capable of quickly and conveniently realizing voltage regulating position switching is urgently needed. SUMMARY

[0003] The main purpose of the present application is to provide an energy-saving dry-type transformer to solve the problem that the operation mode of the prior art is not only time-consuming and laborious, but also cannot realize quick adjustment during the test process.

[0004] In order to achieve the above purpose, the present application provides an energy-saving dry-type transformer, which comprises a transformer body, the transformer body has a high voltage winding, two groups of blocking hole groups are arranged on the high voltage winding, each group of blocking hole groups comprises three blocking hole positions arranged in a regular triangle on the circumferential surface of the high voltage winding, and the two groups of blocking hole groups jointly define five voltage regulating positions, and the distance between adjacent two blocking hole positions is consistent, and further comprising:

[0005] A position adjusting unit comprising two conductive columns and a distributor;

[0006] The distributor has an input shaft and two output shafts, each output shaft drives one conductive column to move through a linkage, so that the two conductive columns are synchronously driven to move, so that the conductive columns are engaged or separated from the corresponding blocking hole positions.

[0007] A preferred scheme is that the energy-saving dry-type transformer further comprises a clamping frame, three transformer bodies are arranged side by side on the clamping frame, and each transformer body is provided with a position adjusting unit;

[0008] Each group of transformer bodies further comprises a core and a low voltage winding, and the core, the low voltage winding and the high voltage winding are arranged in sequence from inside to outside.

[0009] A preferred scheme is that the high-voltage winding is fixedly provided with a circular column corresponding to the gear holes, and the gear holes are coaxially arranged in the circular column.

[0010] A preferred scheme is that the gear adjusting unit further comprises a conductive shell, one end of the conductive shell is an open structure, and the shell has two internally threaded pipes; the conductive shell is fixedly provided with two horn-shaped housings outside the shell.

[0011] The two internally threaded pipes and the two horn-shaped housings are coaxially connected in a one-to-one correspondence.

[0012] The conductive column is engaged with the gear hole, so that the horn-shaped housing is sleeved on the corresponding circular column.

[0013] A preferred scheme is that the transfer further comprises a shell and a linkage plate.

[0014] The input shaft and the two output shafts are eccentrically fixed to the eccentric ring.

[0015] The input shaft is fixedly provided with a rotating handle at the end away from the shell.

[0016] The shell is fixedly connected to the conductive shell through a support rod.

[0017] The linkage plate is located in the shell and has three mounting holes, the linkage plate is sleeved on the eccentric rings of the input shaft and the two output shafts, and the center points of the three mounting holes form an isosceles triangle.

[0018] Each conductive column is fixedly provided with a horizontal plate at the end away from the threaded end, and is screwed with the internally threaded pipe.

[0019] Both ends of the horizontal plate are provided with through holes.

[0020] Each output shaft is coaxially connected to a rotating disc at one end, and the rotating disc is fixedly provided with two insertion rods.

[0021] The two insertion rods are inserted into the through holes of the two horizontal plates in a one-to-one correspondence.

[0022] The two conductive columns are arranged in the two gear holes, so that the two gear holes are electrically connected through the conductive columns, the conductive shell, and the internally threaded pipes.

[0023] A preferred scheme is that the input shaft and the two output shafts are rotatably arranged on the shell of the gear adjusting unit through bearings.

[0024] A preferred scheme is that the conductive shell is fixedly sleeved with an insulating plate, and the conductive shell is provided with insertion groups on both sides, each insertion group comprising six insertion columns, the insertion columns are fixedly connected to the insulating plate and can be inserted into the gear hole.

[0025] Two adjacent stop holes are screwed with conductive posts, and the remaining stop holes are all fitted with insertion posts.

[0026] A preferred embodiment is that the energy-saving dry-type transformer also includes a mounting plate with three arc-shaped slots along its length. The three arc-shaped slots correspond one-to-one with three input shafts. Each input shaft passes through the corresponding arc-shaped slot, and two synchronous pulleys are fixedly fitted on each input shaft.

[0027] These synchronous pulleys are connected by two synchronous belts;

[0028] Each housing is a racetrack-shaped housing with a fixed support rod at the top. A bearing is installed at the end of the support rod away from the housing, and the outer ring of the bearing is fixedly connected to the mounting plate.

[0029] Rotating the support rod causes the corresponding input shaft to slide along the arc-shaped groove.

[0030] The beneficial effects of the above scheme are:

[0031] By setting up an adjustment unit and using a transfer case to synchronously drive two conductive posts, rapid switching of voltage adjustment levels is achieved. During operation, simply rotating the input shaft of the transfer case drives the two conductive posts to synchronously and precisely insert or retract into the corresponding adjustment holes via the linkage, completing the electrical connection with the high-voltage winding coil tap. This structure eliminates the traditional bolt connection method, significantly simplifying the operation process, saving time and effort, and is particularly suitable for rapid adjustment needs during testing, effectively improving testing efficiency and production progress. Attached Figure Description

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0033] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0034] Figure 2 This is a schematic diagram of the front view of the present invention;

[0035] Figure 3 This is a three-dimensional structural schematic diagram of the present invention from another perspective;

[0036] Figure 4 yes Figure 3 Enlarged structural diagram of region A in the middle;

[0037] Figure 5 This is a three-dimensional structural diagram of the gear shifting unit and linkage component of the present invention;

[0038] Figure 6 yes Figure 5 A cross-sectional structural diagram;

[0039] Figure 7This is a three-dimensional structural diagram of the input shaft and eccentric ring of the present invention;

[0040] Figure 8 This is a three-dimensional structural diagram of the adjusting unit and the insulating plate of the present invention;

[0041] Figure 9 This is a schematic diagram of the connection of the pressure regulating gear of the present invention;

[0042] Figure 10 This is a schematic diagram of the connection of the second gear position of the pressure regulating gear position of the present invention;

[0043] Figure 11 This is a schematic diagram of the three-position connection of the pressure regulating gear of the present invention;

[0044] Figure 12 This is a schematic diagram of the four-position connection of the pressure regulating gear of the present invention;

[0045] Figure 13 This is a schematic diagram of the connection of the fifth gear position of the pressure regulating gear position of the present invention;

[0046] Figure 14 This is a schematic diagram of the structure of the second embodiment of the present invention;

[0047] Figure 15 yes Figure 14 A schematic diagram of the structure in partial cross-sectional view;

[0048] Figure 16 yes Figure 15 A magnified structural diagram of region B in the middle.

[0049] Explanation of reference numerals in the attached figures

[0050] 1. Transformer body; 11. High-voltage winding; 12. Stop hole group; 120. Stop hole; 13. Iron core; 14. Low-voltage winding; 15. Frustum column;

[0051] 2. Gear adjustment unit; 21. Conductive post; 22. Transfer case; 220. Housing; 221. Input shaft; 222. Output shaft; 23. Conductive housing; 24. Internal threaded tube; 25. Trumpet-shaped housing; 26. Rotary handle; 27. Eccentric ring; 28. Linkage plate; 280. Mounting hole; 210. Horizontal plate; 211. Through hole;

[0052] 3. Linkage component; 31. Rotating disc; 32. Insert rod; 33. Support rod;

[0053] 4. Insulating board; 41. Insertion assembly; 410. Insertion post;

[0054] 5. Clamping frame;

[0055] 6. Mounting plate; 61. Arc groove; 7. Synchronous pulley; 71. Synchronous belt;

[0056] 8. Support rod; 81. Bearing. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0058] First embodiment:

[0059] like Figures 1-13 As shown, this embodiment provides an energy-saving dry-type transformer, including a transformer body 1. The transformer body 1 includes an iron core 13, a high-voltage winding 11, and a low-voltage winding 14. The iron core 13 is made of stacked cold-rolled silicon steel sheets, and the high-voltage winding 11 and the low-voltage winding 14 are made of wound copper wire or foil. Figure 2 As shown, two sets of baffle holes 12 are provided on the high-voltage winding 11. Each set of baffle holes 12 includes three baffle holes 120 arranged in an equilateral triangle on the circumferential surface of the high-voltage winding 11. The two sets of baffle holes 12 together define five voltage regulating positions (i.e., Figures 9-13 The five voltage regulating positions are shown. A frustum-shaped column 15 (which can be considered a tap) corresponding to each of the regulating holes 120 is fixedly installed on the high-voltage winding 11. The regulating holes 120 (i.e., threaded holes) are coaxially opened within the frustum-shaped column 15. The spacing between two adjacent regulating holes 120 is consistent, forming a uniformly distributed hole structure. Both sets of regulating hole groups 12 are arranged in an equilateral triangle.

[0060] The low-voltage winding 14 is located inside the high-voltage winding 11 and close to the core 13, and uses the same epoxy resin casting process as the high-voltage winding 11. An insulating cylinder (not shown) is provided between the low-voltage winding 14 and the high-voltage winding 11 to increase electrical insulation and prevent short circuits between the high-voltage winding 11 and the low-voltage winding 14. Multiple pads (not shown) are provided between the high-voltage winding 11 and the low-voltage winding 14 of the transformer body 1 to support and constrain the coils, ensuring that the coils are subjected to uniform force under electromagnetic force and have good mechanical properties. The core 13, low-voltage winding 14, and high-voltage winding 11 of the transformer body 1 are arranged sequentially from the inside to the outside to form a compact structure.

[0061] like Figures 9-13 As shown, the five pressure adjustment positions are achieved by combining and inserting two sets of stop holes 12. For example:

[0062] Position 1: Two conductive posts 21 are inserted into the two position holes 120 of the first group (e.g., Figure 9 (as shown)

[0063] Position 2: One conductive post 21 is inserted into one position hole 120 of the first group, and the other conductive post 21 is inserted into one position hole 120 of the second group (e.g., Figure 10 (as shown)

[0064] Stop 3: Two conductive posts 21 are inserted into the second set of two stop holes 120 (e.g.) Figure 11 (as shown)

[0065] Position 4: One conductive post 21 is inserted into a position hole 120 of the second group, and another conductive post 21 is inserted into a position hole 120 of the third group (e.g., Figure 12 (as shown)

[0066] Stop 5: Two conductive posts 21 are inserted into the third set of two stop holes 120 (e.g.) Figure 13 (As shown).

[0067] This combined insertion method allows the adjusting unit 2 to switch between the five voltage adjusting positions of the transformer body 1 through simple mechanical linkage, meeting the operational requirements of the transformer body 1 under different voltage environments. For example, Figures 9-13 The two stop holes 120 circled by the dashed circle in the diagram can be regarded as two conductive posts 21 that are electrically connected.

[0068] like Figure 4 , Figure 6 As shown, the transfer case 22 includes a housing 220, an input shaft 221, two output shafts 222, and a linkage plate 28. The input shaft 221 and the two output shafts 222 are rotatably mounted on the housing 220 via bearings (not shown). A rotary handle 26 is fixed to the end of the input shaft 221 away from the housing 220 for easy manual operation. Eccentric rings 27 are fitted onto both the input shaft 221 and the two output shafts 222, forming an eccentric transmission structure. The housing 220 is fixedly connected to the conductive shell 23 via a rod 33. The linkage plate 28 is located inside the housing 220 and has three mounting holes 280, which are respectively fitted onto the eccentric rings 27 of the input shaft 221 and the two output shafts 222. The center points of the three mounting holes 280 connect to form an isosceles triangle. This design allows the linkage plate 28 to produce a regular reciprocating motion as the input shaft 221 rotates. Driven by the eccentric ring of the input shaft, the linkage plate performs planar motion, which drives the eccentric ring of the output shaft to rotate through the mounting hole, thereby achieving synchronous motion of the two output shafts.

[0069] like Figures 4-6As shown, the gear adjusting unit 2 also includes two conductive posts 21 (which can be considered as bolts) and a conductive shell 23 (which can be considered as a shorting piece). One end of the conductive shell 23 is an open structure; two internally threaded tubes 24 are provided inside the conductive shell 23, and two flared shells 25 are fixedly provided outside the conductive shell 23. The two flared shells 25 correspond one-to-one with the two internally threaded tubes 24 and are coaxially connected. The conductive posts 21 are threadedly connected to the internally threaded tubes 24. One end of the conductive post 21 can be inserted into the gear position hole 120, and the other end contacts the frustum column 15 of the high-voltage winding 11 through the flared shell 25. A horizontal plate 210 is fixedly provided at the end of the conductive post 21 away from its threaded end. Both ends of the horizontal plate 210 are provided with through holes 211. The horizontal plate 210 is connected to the insertion rod 32 of the linkage 3 through the through holes 211. The flared opening of the housing 25 guides the movement of the conductive post 21, automatically correcting the position of the frustum post 15 and preventing misalignment or jamming during insertion. This simplifies the gear adjustment operation and improves the accuracy and reliability of voltage regulation, especially important when switching between multiple gears. The flared housing 25 design makes the linkage of the gear adjustment unit 2 smoother; operators can easily switch gears by rotating the handle 26 without additional tools. This significantly improves the efficiency of testing or operation and maintenance.

[0070] like Figures 4-6 As shown, the linkage 3 includes a linkage plate 28 and a rotating disk 31. The linkage plate 28 has three mounting holes 280, which are respectively fitted onto the eccentric rings 27 of the input shaft 221 and the two output shafts 222. The rotating disk 31 is fixedly mounted on one end of the output shaft 222 (the two are coaxially connected), and two insert rods 32 are fixed on the rotating disk 31 (the two insert rods are circumferentially arranged on the rotating disk 31). The insert rods 32 are inserted into the through holes 211 of the horizontal plate 210 one by one. This design allows the rotating disk 31 to drive the horizontal plate 210 to rotate, thereby driving the conductive post 21 to move. When the input shaft 221 rotates, the eccentric ring 27 drives the linkage plate 28 to oscillate and reciprocate. The linkage plate 28 drives the horizontal plate 210 to rotate through the insert rods 32, thereby driving the conductive post 21 to move along the spiral axis of the internal threaded tube 24, realizing the engagement or disengagement of the conductive post 21 with the stop hole 120.

[0071] The threaded connection between the conductive post 21 and the internally threaded tube 24 allows the conductive post 21 to move smoothly and without jamming under the drive of the linkage plate 28, and also allows the conductive post 21 to maintain a stable position after being inserted into the stop hole 120.

[0072] like Figure 8As shown, the adjusting unit 2 also includes an insulating plate 4, which is fixedly sleeved on the conductive shell 23. Insertion groups 41 are provided on both sides of the conductive shell 23. Each insertion group 41 includes six insertion posts 410, which are all fixedly connected to the insulating plate 4 and can be inserted into the stop holes 120. Two adjacent stop holes 120 are screwed with conductive posts 21, and the remaining stop holes 120 are all fitted with insertion posts 410 (it should be noted that there are eight other insertion posts 410 not inserted into the stop holes 120). The insulating plate 4 has twelve insertion posts 410, which can be inserted into the stop holes 120 to prevent the stop holes 120 from conducting electricity when not engaged, thus improving the safety of the transformer body 1. It should be noted that one insertion post 410 can only be inserted into one stop hole 120.

[0073] Both the insulating plate 4 and the insertion post 410 are made of high-insulation materials, such as acrylic, which have good insulation and heat resistance properties and can withstand the high temperature and high pressure environment during the operation of the transformer body 1. When the conductive post 21 is not inserted into the stop hole 120, the insertion post 410 can be inserted into the stop hole 120 to prevent short circuits between the stop holes 120 and improve the safety of the transformer body 1.

[0074] like Figure 1 As shown, the energy-saving dry-type transformer also includes a clamping frame 5, on which three sets of transformer bodies 1 are arranged side by side. The clamping frame 5 adopts an assembled frame structure, and the support columns of the clamping frame 5 are made of high-strength materials, such as stainless steel or aluminum alloy, which can withstand the weight of the transformer body 1 and the vibration during operation, ensuring the stable operation of the transformer body 1.

[0075] The workflow for the above solution is as follows:

[0076] Before the transformer body 1 is put into operation, the conductive post 21 of the shift unit 2 is not inserted into the shift hole 120. At this time, the insertion post 410 on the insulating plate 4 is inserted into the empty shift hole 120 to prevent short circuit between the shift holes 120 and ensure safety. Hold the insulating plate 4 to fix it, and the operator confirms that the shift unit 2 is in the required shift position.

[0077] The operator manually rotates the rotary handle 26 on the input shaft 221. The input shaft 221 rotates within the housing 220 via bearings, causing the eccentric ring 27 fitted on the input shaft 221 to rotate. The eccentric ring 27 of the input shaft 221 drives the linkage plate 28 to produce a regular reciprocating motion. The linkage plate 28 has three mounting holes 280, which are respectively fitted onto the eccentric rings 27 of the input shaft 221 and the two output shafts 222, thereby driving the two output shafts 222 to move synchronously. The two output shafts 222 rotate with the linkage plate 28 via the eccentric rings 27, and the rotating disk 31 fixed at one end of the output shaft 222 rotates accordingly. Two insert rods 32 are fixed circumferentially on the rotating disk 31, and the insert rods 32 are respectively inserted into the through holes 211 on the horizontal plate 210 of the conductive post 21. The rotating disk 31 drives the horizontal plate 210 to move via the insert rods 32. Because the conductive post 21 is threadedly connected to the internal threaded tube inside the conductive shell 23, the movement of the horizontal plate 210 forces the conductive post 21 to move spirally along the axial direction of the threaded tube (i.e., rotating forward or backward). One end of the conductive post 21 gradually inserts into or exits the stop hole 120 on the high-voltage winding 11. When the conductive post 21 is inserted into the stop hole 120, the flared shell 25 at the other end of the conductive post 21 is fitted onto the frustum post 15 of the high-voltage winding 11, forming an electrical connection. When the conductive post 21 exits the stop hole 120, the insertion post 410 of the insulating plate 4 automatically inserts into the empty stop hole 120 to prevent accidental conduction. Through the synchronous drive of the transfer case 22, the two conductive posts 21 can be precisely inserted into different combinations of stop holes 120 to achieve five voltage regulation positions. During the position switching process, the movement of the conductive post 21 is smooth and without jamming, thanks to the threaded connection and the precise control of the linkage plate 28. When the conductive post 21 is not inserted into the stop hole 120, the insertion post 410 of the insulating plate 4 is always inserted into the stop hole 120 to prevent short circuit of the high-voltage winding 11. After the conductive post 21 is inserted, the threaded connection ensures that the conductive post 21 is in a stable position, preventing displacement or detachment caused by vibration during transformer operation. The entire voltage regulation process requires no tools, is quick to operate, and significantly improves testing or operating efficiency.

[0078] Second embodiment:

[0079] like Figures 14-16 As shown, the energy-saving dry-type transformer also includes a mounting plate 6. The mounting plate 6 has three arc-shaped grooves 61 along its length. The three arc-shaped grooves 61 correspond one-to-one with three input shafts 221. Each input shaft 221 passes through the corresponding arc-shaped groove 61. Two synchronous pulleys 7 are fixedly sleeved on each input shaft 221. These synchronous pulleys 7 are connected by two synchronous belts 71. Each housing 220 is a racetrack-shaped housing, and a support rod 8 is fixed to the top. A bearing 81 is installed at the end of the support rod 8 away from the housing 220. The outer ring of the bearing 81 is fixedly connected to the mounting plate 6. Rotating the support rod 8 causes the corresponding input shaft 221 to slide along the arc-shaped groove 61.

[0080] When it is necessary to simultaneously adjust the voltage levels of three transformer bodies 1 arranged side by side, the operator first confirms that the three adjustment units 2 need to be adjusted to the same target level. The operator manually rotates the support rod 8 fixed to the top of the housing 220, which directly drives the entire transfer case 22, including its racetrack-shaped housing 220, internal transmission mechanism input shaft 221, linkage plate 28, output shaft 222, and the rigidly connected conductive shell 23 and conductive post 21 assemblies, to rotate as a whole around the axis of the support rod 8 at a limited angle. This process changes the spatial orientation of the output end of the entire adjustment unit 2. Repeating the above actions completes the adjustment of the three adjustment units 2. For different positions of the stop holes 120 on the high-voltage winding 11, the insertion angle of the conductive post 21 is dynamically adjusted to achieve optimal alignment.

[0081] The operator does not need to rotate the rotary handle 26 of each of the three gear shifting units 2 individually; they only need to manually rotate the input shaft 221 of any one gear shifting unit 2. When the input shaft 221 rotates, the two synchronous pulleys 7 fixedly mounted on it rotate accordingly. The two synchronous belts 71 transmit power synchronously to the synchronous pulleys 7 on the input shafts 221 of the other two gear shifting units 2, thereby driving the three input shafts 221 to achieve completely synchronized rotational motion.

[0082] The synchronous rotation of each input shaft 221, as described in the first embodiment above, drives its two output shafts 222 and rotating disk 31 to move synchronously via its transfer case 22. The rotating disk 31 moves its respective conductive post 21 horizontal plate 210 via the insertion rod 32, thereby causing the conductive post 21 to move spirally along the internal thread tube 24. Finally, the two pairs of conductive posts 21 on the three transformer bodies 1 will be inserted into or withdrawn synchronously and in phase from the corresponding gear hole 120 combination on their respective high voltage windings 11, realizing a one-time synchronous gear switching of the three transformers.

[0083] The linkage mechanism consisting of mounting plate 6, synchronous pulley 7, and synchronous belt 71 enables synchronous operation of multiple transformer voltage regulating units arranged side by side. A single rotation operation is sufficient to simultaneously switch the same range of voltage levels across all connected transformers.

[0084] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. An energy-saving dry-type transformer, comprising a transformer body (1), wherein the transformer body (1) has a high-voltage winding (11), characterized in that, Two sets of baffle hole groups (12) are provided on the high-voltage winding (11). Each set of baffle hole groups (12) includes three baffle holes (120) arranged in an equilateral triangle on the circumferential surface of the high-voltage winding (11). The spacing between two adjacent baffle holes (120) is the same. The set of baffle holes (120) also includes: A gear shifting unit (2) includes two conductive posts (21) and a transfer case (22). The transfer case (22) has an input shaft (221) and two output shafts (222). Each output shaft (222) can drive one of the conductive posts (21) to move through a linkage (3), so that the two conductive posts (21) are driven to move synchronously, thereby engaging or disengaging the conductive post (21) with the corresponding stop hole (120). The high voltage winding (11) is fixedly provided with a frustum column (15) corresponding to the stop hole (120) one by one, and the stop hole (120) is coaxially opened in the frustum column (15). The gear adjustment unit (2) also includes a conductive shell (23), one end of which is an open structure and has two internally threaded tubes (24) inside. Two horn-shaped shells (25) are fixedly installed outside the conductive shell (23). The two internally threaded tubes (24) correspond one-to-one with the two flared shells (25), and the two are coaxially connected; The conductive post (21) engages with the stop hole (120), so that the horn-shaped housing (25) is fitted onto the corresponding frustum post (15); The transfer case (22) also includes a housing (220) and a linkage plate (28); The input shaft (221) and the two output shafts (222) are all mounted on the housing (220), and all three are eccentrically fixed with an eccentric ring (27). A rotating handle (26) is fixed at the end of the input shaft (221) away from the housing (220); The housing (220) is fixedly connected to the conductive shell (23) by a rod (33); The linkage plate (28) is located inside the housing (220) and has three mounting holes (280). The linkage plate (28) is respectively sleeved on the eccentric rings (27) of the input shaft (221) and the two output shafts (222). Each of the conductive posts (21) has a horizontal plate (210) fixedly installed at one end away from its threaded end, and is screwed to the internally threaded tube (24); Both ends of the horizontal plate (210) are provided with through holes (211). Each of the output shafts (222) has a rotating disk (31) coaxially connected to one end, and two insert rods (32) are fixed on the rotating disk (31). The two insertion rods (32) are inserted into the holes (211) of the two horizontal plates (210) in a one-to-one correspondence; The two conductive posts (21) engage with the two stop holes (120) so that the two stop holes (120) are electrically connected through the conductive posts (21), the conductive shell (23), and the internally threaded tube (24).

2. The energy-saving dry-type transformer according to claim 1, characterized in that, It also includes a clamping frame (5), on which three sets of the transformer bodies (1) are arranged side by side, and each of the transformer bodies (1) is provided with a gear shifting unit (2); Each transformer body (1) further includes an iron core (13) and a low-voltage winding (14), wherein the iron core (13), the low-voltage winding (14) and the high-voltage winding (11) are arranged sequentially from the inside to the outside.

3. The energy-saving dry-type transformer according to claim 1, characterized in that, The input shaft (221) and the two output shafts (222) are rotatably mounted on the housing (220) of the gear shifting unit (2) via bearings.

4. The energy-saving dry-type transformer according to claim 1, characterized in that, An insulating plate (4) is fixedly sleeved on the conductive shell (23). Insertion groups (41) are provided on both sides of the conductive shell (23). Each insertion group (41) includes six insertion posts (410). These insertion posts (410) are all fixedly connected to the insulating plate (4). The insertion posts (410) can be inserted into the stop hole (120). Two adjacent stop holes (120) are screwed to the conductive post (21), and the remaining stop holes (120) can all accommodate the insertion post (410).

5. The energy-saving dry-type transformer according to claim 1, characterized in that, It also includes a mounting plate (6), which has three arc-shaped grooves (61) along its length. The three arc-shaped grooves (61) correspond one-to-one with the three input shafts (221). Each input shaft (221) passes through the corresponding arc-shaped groove (61), and two synchronous pulleys (7) are fixedly sleeved on each input shaft (221). These synchronous pulleys (7) are connected by two synchronous belts (71); Each of the housings (220) is a racetrack-shaped housing, and a support rod (8) is fixed at the top. A bearing (81) is installed at the end of the support rod (8) away from the housing (220), and the outer ring of the bearing (81) is fixedly connected to the mounting plate (6). Rotating the support rod (8) causes the corresponding input shaft (221) to slide along the arc groove (61).

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