Dry-type transformer

Abstract

The invention discloses a dry-type transformer, and relates to the technical field of dry-type transformers, the dry-type transformer comprises a plurality of groups of coil windings, a plurality of contact columns alternately arranged on the coil windings, a clamping block and a voltage transformation gear shifting unit, and the voltage transformation gear shifting unit is used for connecting any two staggered adjacent contact columns to realize gear adjustment of the dry-type transformer; the voltage transformation gear shifting unit comprises a connecting plate and two groups of conducting assemblies; the conduction assembly comprises a plurality of conduction blocks which are evenly arranged in the circumferential direction of the sleeving grooves, the sleeving grooves of the connecting plate are arranged on the outer sides of the two corresponding contact columns in a sleeving mode, the conduction blocks stretch out synchronously to conduct guiding positioning and multi-face synchronous contact on the clamping blocks, and electric connection during gear adjustment is achieved. The technical effects that multi-face contact electric connection is adopted for gear adjustment, so that the adjustment efficiency is improved, the stability and reliability of gear connection points are enhanced, the sudden overheating self-adaptive protection capacity is improved, the damage rate is reduced, and adjustment is more convenient and faster can be achieved.

Description

Technical Field

[0001] This invention relates to the field of dry-type transformer technology, and more particularly to a dry-type transformer. Background Technology

[0002] A dry-type transformer is a power device whose core and windings are not impregnated with insulating oil. It is widely used in high-rise buildings, subways, data centers and other places with high safety requirements. Its core structure includes a cold-rolled silicon steel core and solid-insulated windings. Voltage regulation is achieved by changing the turns ratio of the high-voltage winding (i.e., the tap changer). Tap changer regulation is one of the core functions of a dry-type transformer. By adjusting the tap changer, it can compensate for grid voltage fluctuations, ensure stable output voltage, and prevent equipment damage due to overvoltage / undervoltage.

[0003] Chinese invention patent CN119419045B discloses a dry-type transformer for voltage regulation, including multiple sets of coil windings with alternating contact posts on the coil windings. It also includes a voltage adjustment unit on each coil winding for connecting any two adjacent, staggered contact posts. The voltage adjustment unit has an auxiliary adjustment unit and includes an annular locking groove on the wall of each contact post. This patent utilizes two sliders sliding on a connecting rod, which, with the assistance of a second spring, causes two limiting blocks to slide on the wall of a pressing cavity. This allows the limiting blocks to engage or disengage with the limiting groove, limiting the arc-shaped clamp and thus completing the voltage adjustment of the coil windings. This eliminates the need for frequent loosening and tightening of bolts for voltage adjustment, resulting in higher adjustment efficiency and reducing the risk of damage to the transformer voltage adjustment unit, making voltage adjustment more convenient.

[0004] The above-mentioned scheme uses an arc-shaped clamp and a locking slot to switch the taps when adjusting the voltage of a dry-type transformer. However, the actual contact area between the two is small, and the electrical connection relies on single-point / line contact. Moreover, the arc-shaped clamp and locking slot are prone to oxidation when exposed to humid air for a long time, which increases the contact resistance and can easily cause local overheating and erosion, posing safety hazards and poor stability. At the same time, the transformer needs to withstand continuous vibration when near mechanical equipment (due to equipment vibration) or during transportation. The locking point is prone to loosening and disengagement. Long-term contact wear may further lead to tap change jamming or increased contact resistance, which can easily cause untimely adjustment, voltage instability, and affect equipment operation. Frequent maintenance can also increase costs, seriously restricting the practicality and reliability of dry-type transformers. Summary of the Invention

[0005] This application provides a dry-type transformer that solves the technical problems in the prior art, such as low efficiency due to reliance on single-point / line contact electrical connection for gear adjustment, poor stability of gear contacts after gear shifting, easy damage, and inconvenient adjustment. It achieves the technical effects of using multi-faceted contact electrical connection to improve adjustment efficiency, enhance the stability and reliability of gear contacts, improve the ability to adapt to sudden overheating, reduce the damage rate, and make adjustment more convenient.

[0006] This application provides a dry-type transformer, including multiple sets of coil windings, multiple contact posts alternately arranged on the coil windings, a snap-fit ​​block, and a transformer tap adjustment unit. The transformer tap adjustment unit is used to connect any two adjacent contact posts that are staggered to realize the tap adjustment of the dry-type transformer. The transformer gear adjustment unit includes a connecting plate and two sets of conductive components. The connecting plate is a telescopic adjustment structure with telescopic ends at both ends. The surfaces of the two telescopic ends are provided with socket grooves. Each conductive component is set in the corresponding socket groove. The conductive component includes multiple conductive blocks evenly arranged along the circumference of the socket groove. By fitting the socket groove of the connecting plate onto the outside of the corresponding two contact posts, and by having the conductive blocks extend synchronously to guide and position the locking blocks and achieve multi-face synchronous contact, the electrical connection during gear adjustment is realized.

[0007] Furthermore, both ends of the snap-fit ​​block are rotatably connected to the contact post via ball bearings and electrically connected to the contact post. The middle transverse cross section of the snap-fit ​​block is a regular polygon structure. It extends through two sets of conductive blocks on the connecting plate and synchronously contacts multiple surfaces of the snap-fit ​​blocks on any two staggered adjacent contact posts to achieve gear conduction adjustment.

[0008] Furthermore, the conductive components within the connecting plate include a rotating disk and auxiliary branches; multiple auxiliary branches are provided, evenly arranged along the circumference of the socket groove and disposed within the connecting plate; the rotating disk is rotatably connected within the connecting plate and coaxially disposed with the corresponding socket groove, and an adjusting block is fixed to the top of the rotating disk and multiple abutting blocks are fixed to its bottom.

[0009] Furthermore, the abutting block corresponds one-to-one with the auxiliary branch, and the auxiliary branch includes an arc-shaped block, a bevel gear, a sleeve rod, a conductive block, and a screw rod; The arc-shaped block is slidably connected to the connecting plate via a spring and in the direction of rotation of the adjusting block; multiple toothed blocks are provided on the side of the arc-shaped block away from the contact block; the bevel gear is rotatably connected to the connecting plate via a sleeve rod and meshes with the toothed blocks; the screw is rotatably connected to the sleeve rod via a threaded connection; the conducting block is connected to the screw via a fixing block; one end of the screw is rotatably connected to the fixing block via a bearing, and the other end is slidably connected to the connecting plate.

[0010] Furthermore, the contact block is in contact with the arc-shaped block and a guide slope is provided on the side of the contact block that is closer to the arc-shaped block; a guide slope is also provided on the side of the arc-shaped block that is away from the toothed block. The rotating disk drives the contact block to rotate, and the contact block drives the arc block to move under the action of the guide inclined surface. The arc block drives the bevel gear and the sleeve rod to rotate under the meshing action of the bevel gear, so that the screw drives the conducting block to extend along the radial direction of the sleeve groove through the screw rotation, and contacts the snap block to achieve electrical conduction.

[0011] Furthermore, the transformer adjustment unit also includes a placement box, the end of which is hinged with a flap, and the surface of the placement box has an insertion slot and an adjustment ball inside. The adjustment ball is used to abut against the adjustment block and push the rotating disk to rotate at an angle.

[0012] Furthermore, the inner sidewall of the placement box is divided into two layers: a hard layer and a capsule layer. The capsule layer is filled with a non-Newtonian fluid, which is a suspension of silica particles. This allows the regulating ball to harden the non-Newtonian fluid through rolling shear during the shaking of the dry-type transformer. The capsule layer transmits the pressure of the hardened fluid to the regulating block through elastic pressure-bearing deformation, and then the contact pressure increases adaptively with the shaking intensity through force transmission.

[0013] Furthermore, the side of the conductive block that contacts the snap-fit ​​block has a plurality of cavities evenly distributed. Each cavity has a copper mesh fixed on its outer side and a capsule fixed inside each cavity. The capsule is made of silicone rubber and is injected with a mixture after vacuuming. The capsule is then fixed to the inner surface of the copper mesh by adhesive.

[0014] Furthermore, the mixture is a mixture of ethanol and water, with ethanol accounting for 80% and a boiling point reduced to 70°C, to cope with sudden overheating.

[0015] This invention also provides a method for adjusting the tap change of a dry-type transformer, comprising the following: Step 1: Adjust the length of the telescopic end of the connecting plate of the transformer adjustment unit so that the sockets at both ends are precisely fitted onto the outside of any two staggered adjacent contact posts, and the conductor block is in the retracted state and not in contact with the contact posts. Step 2: By placing adjusting balls into the placement box, the adjusting block is rotated by the gradually added adjusting balls, which in turn drives the rotating disk to rotate. The guide slope of the bottom contact block pushes the arc block to slide. The toothed block of the arc block meshes with the bevel gear, driving the sleeve rod to rotate. The screw inside the sleeve rod drives the fixed block and the conductive block to extend synchronously along the radial direction of the sleeve groove through the threaded transmission. Step 3: The extended multiple conductive blocks make multi-face synchronous contact with the locking blocks on the contact post. At the same time, the locking blocks rotate on their own during the extension of the multiple conductive blocks to match the multiple conductive blocks, thus completing the gear position electrical conduction. Step 4: When you need to switch gears, open the flap and rotate the rotating disc in the opposite direction. The screw reverses its transmission, causing the conductor block to retract and disengage from the locking block. Repeat steps one to four to attach the connecting plate to the new staggered adjacent contact post to complete the new gear connection.

[0016] One or more technical solutions provided in this application have at least the following technical effects or advantages: By using a rotating disk and other transmission components to drive the conductive block to extend synchronously and make multi-faceted contact with the locking block, a stable electrical connection is achieved, solving the problems of low efficiency and poor stability associated with single-point / line contact. The evaporation and expansion of the mixed liquid within the conductive block's inner chamber pushes the copper mesh to bulge, increasing the contact area and absorbing heat to achieve overheat self-protection, solving the problem of overheating and erosion associated with single-point contact. The shearing of the non-Newtonian fluid within the box, via an adjusting ball, amplifies the force, driving the rotating disk to fine-tune the extension of the conductive block, achieving adaptive force amplification during wobbling and solving the problem of loose contact. This effectively solves the technical problems of low efficiency, poor stability at the gear contact point after gear shifting, easy damage, and inconvenient adjustment caused by reliance on single-point / line contact electrical connection in existing technologies. It achieves the technical effects of using multi-faceted contact electrical connection to improve adjustment efficiency, enhance the stability and reliability of the gear contact point, improve the ability to adaptively protect against sudden overheating, reduce the damage rate, and make adjustment more convenient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a dry-type transformer according to the present invention.

[0018] Figure 2 This is a schematic diagram of the transformer tap adjustment unit and contact post of a dry-type transformer according to the present invention.

[0019] Figure 3 This is a cross-sectional view of the transformer tap-adjusting unit and a single contact post of a dry-type transformer according to the present invention.

[0020] Figure 4 This invention relates to a dry-type transformer. Figure 3 A magnified view of a portion of point A in the middle.

[0021] Figure 5 This is a longitudinal full sectional view of the transformer tap adjustment unit and a single contact post of a dry-type transformer according to the present invention.

[0022] Figure 6 This is a transverse full sectional view of the transformer tap adjustment unit and a single contact post of a dry-type transformer according to the present invention.

[0023] Figure 7 This is a cross-sectional view of the conductor block, bevel gear, and sleeve of a dry-type transformer according to the present invention.

[0024] Figure 8This is a partial structural cross-sectional view of the placement box and rotating disk of a dry-type transformer according to the present invention.

[0025] The attached diagram lists the components represented by each number as follows: 100. Coil winding; 101. Contact post; 102. Snap-fit ​​block; 200. Transformer adjustment unit; 210. Connecting plate; 220. Rotating disk; 221. Adjusting block; 222. Abutting block; 230. Arc block; 231. Spring; 232. Tooth block; 240. Bevel gear; 250. Sleeve rod; 260. Conducting block; 261. Fixing block; 262. Copper mesh; 263. Encapsulation body one; 264. Mixture; 270. Screw; 280. Placement box; 281. Flip plate; 282. Adjusting ball; 283. Encapsulation layer. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0029] Please see Figure 1 This is a schematic diagram of the overall structure of a dry-type transformer according to the present invention. Figures 2 to 8The snap-fit ​​block 102 shown is a regular hexagon, and the conductive block 260 is a group of six. In actual implementation, the corresponding regular polygon shape and the matching connecting plate 210 and the matching conductive block 260 can be selected according to the requirements to ensure that the contact area is selectable.

[0030] This application's dry-type transformer utilizes the evaporation and expansion of the mixture 264 within the inner bladder 263 of the conductor block 260 to bulge the copper mesh 262, increasing the contact area and absorbing heat to achieve overheat self-protection and solve the problem of single-point contact overheating and erosion. The adjustment ball 282 within the placement box 280 shears the non-Newtonian fluid, hardening and increasing the force to drive the rotating disk 220 to fine-tune the extension of the conductor block 260, achieving adaptive force amplification to solve contact loosening. Through the rotating disk 220 and other transmission components, the conductor block 260 extends synchronously, making multi-faceted contact with the locking block 102, achieving stable electrical connection and solving the problems of low efficiency and poor stability of single-point / line contact. This achieves the technical effects of using multi-faceted contact electrical connection for gear adjustment to improve adjustment efficiency, enhance stability and reliability at gear contact points, improve the ability to adaptively protect against sudden overheating, reduce damage rate, and make adjustment more convenient.

[0031] Example 1: like Figures 1 to 6 As shown, this application discloses a dry-type transformer, including multiple sets of coil windings 100, multiple contact posts 101 alternately arranged on the coil windings 100, a snap-fit ​​block 102, and a transformer adjustment unit 200. The transformer adjustment unit 200 is used to connect any two adjacent contact posts 101 to realize the adjustment of the dry-type transformer's tap position. The transformer gear adjustment unit 200 includes a connecting plate 210 and two sets of conductive components. The connecting plate 210 is a telescopic adjustment structure with telescopic ends at both ends. The surfaces of the two telescopic ends are provided with socket grooves. Each conductive component is set in the corresponding socket groove. The conductive component includes a plurality of conductive blocks 260 evenly arranged along the circumference of the socket groove. By fitting the socket groove of the connecting plate 210 onto the outside of the corresponding two contact posts 101, and by having the conductive blocks 260 extend synchronously to guide and position the locking block 102 and make multi-face synchronous contact, the electrical connection during gear adjustment is realized.

[0032] like Figure 5 and Figure 6 As shown, both the upper and lower ends of the snap-fit ​​block 102 are rotatably connected to the contact post 101 via ball bearings and are electrically connected to the contact post 101. The middle transverse cross section of the snap-fit ​​block 102 is a regular polygon structure. It extends through two sets of conductive blocks 260 on the connecting plate 210 and synchronously contacts multiple surfaces of the snap-fit ​​block 102 on any two staggered adjacent contact posts 101 to realize gear conduction adjustment.

[0033] This application employs a method where the telescopic end of the connecting plate 210 is directly fitted onto the outside of any two staggered adjacent contact posts 101. Multiple circumferentially evenly arranged conductive blocks 260 extend synchronously to guide and position the locking block 102, ensuring multi-faceted synchronous contact. This avoids single-point incomplete connections. Furthermore, the locking block 102, via ball bearings, can automatically adjust its angle as the conductive blocks 260 extend, automatically rotating to match the multi-faceted contact of the conductive blocks 260, ensuring sufficient electrical contact surface. When switching gears, simply retracting the conductive blocks 260 disengages them from the original contact post 101, and then fitting a new contact post 101 before extending the conductive blocks 260 again, eliminating the need for disassembly or re-fixing and avoiding cumbersome operations. The telescopic adjustment structure of the connecting plate 210 can adapt to changes in the spacing of contact posts 101 at different gear positions, with the slot directly fitting onto two contact posts 101.

[0034] like Figures 3 to 6 As shown, the conductive assembly in the connecting plate 210 includes a rotating disk 220 and auxiliary branches; multiple auxiliary branches are provided, which are evenly arranged along the circumference of the socket groove and are located in the connecting plate 210; the rotating disk 220 is rotatably connected in the connecting plate 210 and is coaxially arranged with the corresponding socket groove; an adjusting block 221 is fixed on the top of the rotating disk 220 and multiple abutting blocks 222 are fixed on its bottom.

[0035] The abutting block 222 corresponds one-to-one with the auxiliary branch, which includes an arc block 230, a bevel gear 240, a sleeve rod 250, a conducting block 260, and a screw 270. The arc-shaped block 230 is slidably connected to the connecting plate 210 via a spring 231 and in the rotation direction of the adjusting block 221; multiple toothed blocks 232 are provided on the side of the arc-shaped block 230 away from the contact block 222; the bevel gear 240 is rotatably connected to the connecting plate 210 via a sleeve rod 250 and meshes with the toothed blocks 232; the screw 270 is rotatably connected to the sleeve rod 250 via a threaded connection; the conducting block 260 is connected to the screw 270 via a fixing block 261; one end of the screw 270 is rotatably connected to the fixing block 261 via a bearing, and the other end is slidably connected to the connecting plate 210.

[0036] The contact block 222 contacts the arc-shaped block 230 and a guide slope is provided on the side of the arc-shaped block 230; the side of the arc-shaped block 230 away from the toothed block 232 is also provided with a guide slope. The rotating disk 220 drives the abutment block 222 to rotate. Under the action of the guide inclined surface, the abutment block 222 drives the arc block 230 to move. The arc block 230, under the meshing action with the bevel gear 240, drives the bevel gear 240 and the sleeve rod 250 to rotate, so that the screw 270 drives the conducting block 260 to extend along the radial direction of the sleeve groove through the screw rotation, and contacts the snap block 102 to achieve electrical conduction.

[0037] like Figure 2 and Figure 8 As shown, the transformer adjustment unit 200 also includes a placement box 280. A flap 281 is hinged to the end of the placement box 280. The surface of the placement box 280 is provided with a delivery slot and an adjustment ball 282 is installed inside. The adjustment ball 282 is used to abut against the adjustment block 221 and push the rotating disk 220 to rotate at an angle.

[0038] The inner sidewall of the placement box 280 is divided into two layers: a hard layer and a capsule layer 283. The capsule layer 283 is filled with a non-Newtonian fluid, which is a suspension of silica particles. During the shaking of the dry-type transformer, the regulating ball 282 hardens the non-Newtonian fluid through rolling shear. The capsule layer 283 transmits the pressure of the hardened fluid to the regulating block 221 through elastic pressure-bearing deformation. Then, through the transmission of force, the contact pressure increases adaptively with the shaking intensity.

[0039] This application achieves adaptive force amplification during shaking by coordinating the placement box 280, adjusting ball 282, capsule layer 283, rotating disk 220, and adjusting block 221, thus solving the problem of loose contact. When shaking triggers the adjusting ball 282 to roll and shear harden a non-Newtonian fluid, the hardened fluid pushes the adjusting block 221 in an elastic pressure manner, causing the rotating disk 220 to rotate slightly around its axis (i.e., the rotation angle adaptively increases with the shaking intensity). This causes the contact block 222 at the bottom of the rotating disk 220 to rotate accordingly, pushing the arc-shaped block 230 to slide through the guide slope. The toothed block 232 of the arc-shaped block 230 meshes with the bevel gear 240, driving the sleeve rod 250 to rotate. The screw 270, driven by a threaded transmission within the sleeve 250, further drives the conductive block 260 to extend radially along the sleeve groove (i.e., the extension length increases with the intensity of the shaking). The extended conductive block 260 can further strengthen the contact pressure with the locking block 102, thereby counteracting the loosening caused by the shaking. This achieves an adaptive increase in contact pressure with the intensity of the shaking (the more violent the shaking, the more obvious the pressure enhancement). This further improves the stability of the transformer's contacts during operation or transportation, enhances safety, and solves the problem of insufficient electrical contact and easy loose connection during gear adjustment, thus further ensuring the stability of the contact conduction point.

[0040] Considering that the multi-faceted structure of the contact block 102 may cause overheating on one side due to wear, the essence of which is that the current density of the conducting block 260 on that side is too high, the contact area is insufficient, or the contact resistance is abnormally increased, resulting in concentrated release of Joule heat. In order to solve the problem of sudden rapid overheating caused by poor contact (such as fretting wear, pressure decay) leading to a sudden increase in local resistance, this application proposes the following technical solution to the above-mentioned technical problem, specifically: like Figures 4 to 7As shown, the conductive block 260 has multiple cavities evenly distributed on the side that contacts the snap-fit ​​block 102. Each cavity has a copper mesh 262 fixed on its outer side and a capsule 263 fixed inside each cavity. The capsule 263 is made of silicone rubber and is injected with a mixed liquid 264 after vacuuming. The capsule 263 is fixed to the inner surface of the copper mesh 262 by adhesive.

[0041] The mixture 264 is a mixture of ethanol and water, with ethanol accounting for 80% and a boiling point reduced to 70°C, used to cope with sudden overheating.

[0042] This application, through the cooperation of the conductive block 260 with the internal bladder 263, copper mesh 262, and mixed liquid 264, can achieve overheat self-regulation and solve the problem of contact surface erosion. Specifically, when a contact surface suddenly overheats due to a sudden increase in load, the mixed liquid 264 inside the bladder 263 can quickly reach its boiling point and evaporate and expand violently. With elastic thrust, it pushes the outer copper mesh 262 to bulge and expand along the cavity direction to form a larger contact surface, further increasing the contact area with the locking block 102 and dispersing the concentrated heat to a larger area. In addition, the mixed liquid 264 can absorb a large amount of latent heat during the evaporation process, directly reducing the contact surface temperature, avoiding transformer damage due to overheating, and improving safety performance and the stability of transformer operation performance.

[0043] In actual operation, the steps of this embodiment are as follows: Step 1: Adjust the length of the telescopic end of the connecting plate 210 of the transformer adjustment unit 200 so that the sockets at both ends are precisely fitted onto the outside of any two staggered adjacent contact posts 101, and the conductor block 260 is in the retracted state and is not in contact with the contact post 101. Step 2: By placing adjusting balls 282 into the placement box 280, the adjusting block 221 is rotated by the gradually added adjusting balls 282, thereby driving the rotating disk 220 to rotate. The guide slope of the bottom contact block 222 pushes the arc block 230 to slide. The tooth block 232 of the arc block 230 meshes with the bevel gear 240, driving the sleeve rod 250 to rotate. The screw 270 in the sleeve rod 250 drives the fixing block 261 and the conducting block 260 to extend synchronously along the radial direction of the sleeve groove through the threaded transmission. Step 3: The multiple extended conductive blocks 260 make multi-face synchronous contact with the locking block 102 on the contact post 101. At the same time, the locking block 102 rotates on its own during the extension of the multiple conductive blocks 260 to match the multiple conductive blocks 260, thus completing the gear position electrical conduction. Step 4: When it is necessary to switch gears, open the flap 281 and rotate the rotating disk 220 in the opposite direction. The screw 270 reverses the transmission to retract the conductor block 260 and disengage it from the snap-fit ​​block 102. Repeat steps one to four to attach the connecting plate 210 to the new staggered adjacent contact post 101 to complete the new gear connection.

[0044] In the above steps, if a certain contact surface of the snap-fit ​​block 102 suddenly overheats due to the load, the mixture 264 of the inner bladder 263 of the conductive block 260 rapidly evaporates and expands, pushing the arc-shaped elastic copper mesh 262 to bulge, which increases the contact area to disperse heat and also evaporates to absorb heat and cool down, thus avoiding ablation. When the dry-type transformer shakes, the adjusting ball 282 rolls and shears the non-Newtonian fluid of the inner bladder layer 283 of the placement box 280. The fluid thickens and hardens due to shearing, and transmits the pressure to the adjusting block 221 through elastic pressure-bearing deformation, pushing the rotating disk 220 to finely adjust the angle, thereby increasing the extension length of the conductive block 260, strengthening the contact pressure with the snap-fit ​​block 102, and preventing loosening.

[0045] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: It effectively solves the technical problems in the existing technology, such as low efficiency due to single-point / line contact electrical connection for gear adjustment, poor stability of gear contacts after gear shifting, easy damage, and inconvenience of adjustment. It achieves the technical effects of using multi-faceted contact electrical connection to improve adjustment efficiency, enhance the stability and reliability of gear contacts, improve the ability to adapt to sudden overheating, reduce the damage rate, and make adjustment more convenient.

[0046] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A dry-type transformer, characterized in that, It includes multiple sets of coil windings (100), multiple contact posts (101) alternately arranged on the coil windings (100), a snap-fit ​​block (102) and a transformer adjustment unit (200). The transformer adjustment unit (200) is used to connect any two adjacent contact posts (101) to realize the adjustment of the dry-type transformer gear. The transformer gear adjustment unit (200) includes a connecting plate (210) and two sets of conductive components; the connecting plate (210) is a telescopic adjustment structure with telescopic ends at both ends, and the two telescopic ends are provided with socket grooves. Each conductive component is set in the corresponding socket groove. The conductive component includes multiple conductive blocks (260) evenly arranged along the circumference of the socket groove. By fitting the socket groove of the connecting plate (210) on the outside of the corresponding two contact posts (101), and by synchronously extending the conductive blocks (260) to guide and position the snap-fit ​​block (102) and make multi-face synchronous contact, the electrical connection during gear adjustment is realized.

2. A dry-type transformer as described in claim 1, characterized in that, The upper and lower ends of the snap-fit ​​block (102) are rotatably connected to the contact post (101) by ball bearings and electrically connected to the contact post (101). The middle transverse section of the snap-fit ​​block (102) is a regular polygon structure. It extends through two sets of conductive blocks (260) on the connecting plate (210) and synchronously contacts multiple surfaces of the snap-fit ​​block (102) on any two staggered adjacent contact posts (101) to realize gear conduction adjustment.

3. A dry-type transformer as described in claim 1, characterized in that, The conductive components in the connecting plate (210) include a rotating disk (220) and auxiliary branches; multiple auxiliary branches are provided, which are evenly arranged along the circumference of the socket groove and are located in the connecting plate (210); the rotating disk (220) is rotatably connected in the connecting plate (210) and coaxially arranged with the corresponding socket groove; an adjusting block (221) is fixed on the top of the rotating disk (220) and multiple abutting blocks (222) are fixed on its bottom.

4. A dry-type transformer as described in claim 3, characterized in that, The contact block (222) corresponds one-to-one with the auxiliary branch, which includes an arc block (230), a bevel gear (240), a sleeve rod (250), a guide block (260), and a screw (270). The arc-shaped block (230) is slidably connected to the connecting plate (210) via a spring (231) and in the direction of rotation of the adjusting block (221); a plurality of toothed blocks (232) are provided on the side of the arc-shaped block (230) away from the contact block (222); the bevel gear (240) is rotatably connected to the connecting plate (210) via a sleeve rod (250) and meshes with the toothed blocks (232); the screw (270) is rotatably connected to the sleeve rod (250) via a threaded connection; the conducting block (260) is connected to the screw (270) via a fixing block (261); one end of the screw (270) is rotatably connected to the fixing block (261) via a bearing, and the other end is slidably connected to the connecting plate (210).

5. A dry-type transformer as described in claim 4, characterized in that, The contact block (222) contacts the arc-shaped block (230) and a guide slope is provided on the side of the arc-shaped block (230) that is closer to it; a guide slope is also provided on the side of the arc-shaped block (230) that is away from the toothed block (232); The rotating disk (220) drives the abutment block (222) to rotate. Under the action of the guide inclined surface, the abutment block (222) drives the arc block (230) to move. The arc block (230) drives the bevel gear (240) and the sleeve rod (250) to rotate under the meshing action with the bevel gear (240). This causes the screw (270) to drive the conductive block (260) to extend along the radial direction of the sleeve groove through the screw rotation, and to contact the snap block (102) and achieve electrical conduction.

6. A dry-type transformer as described in claim 1, characterized in that, The transformer adjustment unit (200) also includes a placement box (280), with a flap (281) hinged at the end of the placement box (280). The surface of the placement box (280) is provided with a delivery slot and an adjustment ball (282) is installed inside. The adjustment ball (282) is used to abut against the adjustment block (221) and push the rotating disk (220) to rotate at an angle.

7. A dry-type transformer as described in claim 6, characterized in that, The inner sidewall of the placement box (280) is divided into two layers: a hard layer and a capsule layer (283). The capsule layer (283) is filled with a non-Newtonian fluid, which is a suspension of silica particles. This allows the regulating ball (282) to harden the non-Newtonian fluid through rolling shear during the shaking of the dry transformer. The capsule layer (283) transmits the pressure of the hardened fluid to the regulating block (221) through elastic pressure-bearing deformation. Then, the contact pressure increases adaptively with the shaking intensity through the transmission of force.

8. A dry-type transformer as described in claim 5, characterized in that, The conductive block (260) has multiple cavities evenly distributed on the side that contacts the snap-fit ​​block (102). Each cavity has a copper mesh (262) fixed on its outer side and a capsule (263) fixed inside each cavity. The capsule (263) is made of silicone rubber and is injected with a mixture (264) after vacuuming. The capsule (263) is fixed to the inner surface of the copper mesh (262) by adhesive.

9. A dry-type transformer as described in claim 8, characterized in that, The mixture (264) is a mixture of ethanol and water, with ethanol accounting for 80% and a boiling point reduced to 70°C, used to cope with sudden overheating.

10. A method for adjusting the range of a dry-type transformer, using a dry-type transformer as described in any one of claims 1-9, characterized in that, Includes the following: Step 1: Adjust the length of the telescopic end of the connecting plate (210) of the transformer adjustment unit (200) so that the sockets at both ends are precisely fitted on the outside of any two staggered adjacent contact posts (101), and the conductor block (260) is in the retracted state and does not contact the contact post (101). Step 2: By placing adjusting balls (282) into the placement box (280), the adjusting block (221) is rotated by the gradually added adjusting balls (282), thereby driving the rotating disk (220) to rotate. The guide slope of the bottom contact block (222) pushes the arc block (230) to slide. The tooth block (232) of the arc block (230) meshes with the bevel gear (240), driving the sleeve rod (250) to rotate. The screw (270) in the sleeve rod (250) drives the fixed block (261) and the conductive block (260) to extend synchronously along the radial direction of the sleeve groove through the thread transmission. Step 3: The extended multiple conductive blocks (260) make multi-face synchronous contact with the snap-fit ​​block (102) on the contact post (101). At the same time, the snap-fit ​​block (102) rotates on its own during the extension of the multiple conductive blocks (260) to match the multiple conductive blocks (260) and complete the gear position electrical conduction. Step 4: When it is necessary to switch gears, open the flap (281) and rotate the turntable (220) in the opposite direction. The screw (270) reverses the transmission to retract the guide block (260) and disengage from the snap block (102). Repeat steps one to four to connect the connecting plate (210) to the new staggered adjacent contact post (101) to complete the new gear connection.

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