A compression structure of a dry-type transformer and a dry-type transformer

Abstract

This invention relates to the field of dry-type transformer technology, providing a clamping structure for a dry-type transformer and a dry-type transformer. The clamping structure includes: a pad assembly, the lower end of which is used to clamp the coil, and a pressure block fixedly installed on the upper end, the pressure block having a positioning groove along the radial direction of the coil; a limiting assembly, including a first limiting assembly and a second limiting assembly, the first and second limiting assemblies being rotatably mounted in the positioning groove; and a pressure pin, the lower end of which is located in the limiting space and abuts against the positioning groove, the lower end of which has a limiting hole. When the pressure pin is in a first preset position, the first limiting assembly engages with the limiting hole; when the pressure pin is in a second preset position, the second limiting assembly engages with the limiting hole. This application achieves clamping of the pad assembly, keeping the pad assembly in its current position, avoiding cracking and damage to the pad assembly, and ensuring the stability of the entire structure.

Description

Technical Field

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

[0002] Dry-type transformers are widely used in key scenarios such as high-rise buildings, subways, and new energy power plants due to their oil-free and convenient maintenance features. However, when there is a short circuit fault in the power grid (especially a three-phase short circuit or a two-phase short circuit), they will be subjected to huge electrodynamic forces (axial force can reach tens of thousands of Newtons, and radial force can reach thousands of Newtons), which can easily lead to problems such as winding deformation, support bar breakage, and displacement and breakage of insulation pads. In severe cases, it can cause equipment burnout.

[0003] As a key force-transmitting component between the winding and the core / support bars, the structural stability of the insulating pad directly determines the overall short-circuit withstand capability. Existing technologies have the following drawbacks:

[0004] Traditional rectangular pads have a small contact area with the windings, leading to excessive local pressure during short circuits. Relying solely on a single clamping pin for fixation, the preload of the clamping pin on the pad causes stress concentration, making it prone to cracking. Traditional pads are also susceptible to lateral and longitudinal displacement under short-circuit vibrations during operation, causing winding instability. In contrast, the integrally molded fixing claws of the insulating pads generate interaction forces between the claws and the high and low voltage windings when the coils shift. In severe cases, this can lead to stress concentration at the claw root, causing the claw to break. Height errors between the high and low voltage coils cause the pad support to tilt, which traditional structures cannot dynamically compensate for, exacerbating localized overheating. Furthermore, the lack of a real-time pressure feedback mechanism means that preload decay cannot be warned of in a timely manner. Summary of the Invention

[0005] The purpose of this invention is to provide a clamping structure for a dry-type transformer and a dry-type transformer to solve the above-mentioned technical problems existing in the prior art, mainly including the following:

[0006] The first aspect of this application provides a clamping structure for a dry-type transformer, comprising:

[0007] A pad assembly, the lower end of which is used to press the coil, and a pressure block is fixedly installed on the upper end. The pressure block has a positioning groove along the radial direction of the coil.

[0008] A limiting component, comprising a first limiting component and a second limiting component, wherein the first limiting component and the second limiting component are rotatably mounted in the positioning groove, and the first limiting component and the second limiting component are arranged relative to each other to define a limiting space;

[0009] A pressure pin, the lower end of which is located in the limiting space and abuts against the positioning groove. The lower end of the pressure pin is provided with a limiting hole. When the pressure pin is in a first preset position, the first limiting component is engaged with the limiting hole. When the pressure pin is in a second preset position, the second limiting component is engaged with the limiting hole.

[0010] Furthermore, to better realize this application, the following structure is specifically adopted: the first limiting component and the second limiting component have the same structure, both including:

[0011] A first limiting member and a second limiting member are provided. The first limiting member is rotatably mounted on one side of the positioning groove, and the second limiting member is rotatably mounted on the opposite side of the positioning groove. The first trigger end of the first limiting member and the second trigger end of the second limiting member are arranged opposite to each other. When the pressing pin moves toward the first preset position, the pressing pin pushes the first limiting member and the second limiting member to rotate. The first trigger end and the second trigger end move away from each other, and the first limiting end of the first limiting member and the second limiting end of the second limiting member move closer to each other and are respectively inserted into the limiting hole.

[0012] To further improve the implementation of this application, the following structure is specifically adopted: the first limiting end and the second limiting end have the same structure, both including:

[0013] A first guide surface and a second guide surface are connected by a transition surface at the ends. The second limiting end can be inserted into the limiting hole through the first guide surface and the second guide surface.

[0014] To further improve the implementation of this application, the following configuration structure is adopted: there is a clearance gap between the first trigger end and the second trigger end.

[0015] To further improve the implementation of this application, the following structure is specifically adopted: the pressure block is symmetrically provided with a first clearance groove and a second clearance groove on both sides facing the positioning groove. The first clearance groove and the second clearance groove are both connected to the positioning groove. The first limiting member is installed in the first clearance groove through a rotating shaft, and the second limiting member is installed in the second clearance groove by rotation.

[0016] To further improve the implementation of this application, the following structure is specifically adopted: a plurality of rotating grooves are provided at intervals on the upper surface of the pressure block at positions corresponding to the first clearance groove and the second clearance groove, and the rotating grooves are connected to the first clearance groove and the second clearance groove, and the rotating shaft is installed in the rotating groove.

[0017] To further improve the implementation of this application, the following structure is specifically adopted: a pressure sensor is installed below the pressure block to detect the force on the pad assembly.

[0018] To further improve the implementation of this application, the following configuration structure is adopted: a liner is installed below the pad assembly, and the liner has a plurality of hemispherical protrusions spaced apart on the side facing the coil.

[0019] To further improve the implementation of this application, the following structure is specifically adopted: it further includes a clamp, which is fixedly connected to the upper end of the pressure pin. The clamp is provided with an adjustment hole, which is parallel to the positioning groove. The pressure pin can pass through the adjustment hole and abut against the positioning groove. A rack is provided on the inner wall of the adjustment hole, and the outer wall of the pressure pin is rotatably engaged with the rack to adjust the position of the pressure pin on the clamp.

[0020] A second aspect of this application provides a dry-type transformer, including the clamping structure of the dry-type transformer as described above.

[0021] Compared with the prior art, the present invention has at least the following technical effects:

[0022] This application provides a clamping structure for a dry-type transformer, including a pad assembly and a limiting assembly. The limiting assembly is installed in a pressure block above the pad assembly. The limiting assembly includes a first limiting assembly and a second limiting assembly. The pressure pin clamps the pad assembly by pressing against it. When the pad assembly undergoes lateral and longitudinal displacement under short-circuit vibration during operation, it is converted into movement of the pressure pin. When the pressure pin moves to a first preset position, the first limiting assembly engages with a limiting hole. When it moves to a second position, the second limiting assembly engages with a limiting hole. This prevents the movement of the pressure pin, thereby clamping the pad assembly and keeping it in its current position. This avoids cracking and damage to the pad assembly and ensures the stability of the entire structure. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an overall schematic diagram of the clamping structure in this application;

[0025] Figure 2 yes Figure 1 Enlarged view of section A in the middle;

[0026] Figure 3 This is an exploded view of the clamping structure in this application;

[0027] Figure 4 This is a schematic diagram of the limiting component in this application;

[0028] Figure 5 This is a schematic diagram of the limiting end structure in this application;

[0029] Figure 6 This is a left view of the liner in this application;

[0030] Figure 7 This is a first perspective view of the lining plate in this application;

[0031] Figure 8 This is a second perspective view of the lining plate in this application;

[0032] Figure 9 This is a structural schematic diagram of the positioning component in this application;

[0033] Figure 10 This is a structural diagram of the clamping component;

[0034] Figure 11 yes Figure 10 Enlarged view of section B;

[0035] Figure 12 This is a schematic diagram of the dry-type transformer in this application;

[0036] Figure 13 yes Figure 12 Enlarged view of section C.

[0037] In the picture:

[0038] 10. Pad assembly; 11. Pad body; 111. Mounting groove; 112. Pressing block groove; 12. Positioning element; 121. Positioning strip; 122. Positioning post; 123. Claw; 124. First lower surface; 125. Second lower surface; 126. Positioning hole;

[0039] 20. Pressure block; 21. Positioning groove; 22. First clearance groove; 23. Second clearance groove; 24. Rotation groove; 25. Rotating shaft;

[0040] 30. Limiting component; 31. First limiting component; 32. Second limiting component; 33. Limiting space; 33. First limiting member; 331. First trigger end; 332. First limiting end; 3321. First guide surface; 3322. Second guide surface; 3323. Transition surface; 34. Second limiting member; 341. Second trigger end; 342. Second limiting end; 35. Clearance gap;

[0041] 40. Pressing pin; 41. Limiting hole; 42. First pressing pin; 43. Second pressing pin;

[0042] 50. Liner plate; 51. Hemispherical protrusion; 52. Positioning protrusion; 53. First liner plate; 54. Second liner plate; 55. Connecting hole;

[0043] 60. Clamping piece; 61. Adjustment hole; 611. Rack.

[0044] 200, coil; 210, low-voltage coil; 220, high-voltage coil.

[0045] 300. Insulating cylinder;

[0046] 400. Iron core. Detailed Implementation

[0047] The following description provides many different embodiments or examples for implementing various features of this application. The elements and arrangements described in the specific examples below are only for concise expression of this application and are merely examples, not intended to limit this application.

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 a part of the embodiments of this application, not all of them. 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. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to represent selected embodiments of this application.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0050] In this application, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" a first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] Traditional rectangular pads have a small contact area with the winding. During short circuits, when local pressure is excessive, they rely on a single pin for fixation at a single point. The preload of the pin acts on the pad, causing stress concentration and making the pad prone to cracking. Traditional pads are also prone to lateral and longitudinal displacement under short-circuit vibrations during operation, leading to winding instability. In contrast, the insulating pad fixing claws are integrally molded. When the coil shifts, the claws interact with the high and low voltage windings. Severe displacement can cause stress concentration at the claw root, leading to claw breakage. Furthermore, there may be a height difference between the high and low voltage coils. This height difference can cause the pad to tilt towards the lower side, and traditional structures cannot dynamically compensate for this height difference, exacerbating localized coil overheating. Finally, the lack of a real-time pressure feedback mechanism means that preload decay cannot be warned in time.

[0052] In existing technology, double clamping pins are typically used to tighten the pad, meaning two clamping pins are installed on one pad for simultaneous tightening. The upper ends of the two clamping pins pass through a clamp for fixation, and the lower ends abut against the pad. The two clamping pins abut against the high-voltage coil and low-voltage coil of the pad, respectively. However, for transformers of different specifications, the diameters of the high-voltage and low-voltage coils are different, and the abutment positions of the two clamping pins on the pad also need to be different. Since the distance between the two clamping pins on each clamp is fixed, the clamp cannot be adapted to transformers of different specifications.

[0053] Therefore, the purpose of this invention is to provide a clamping structure for a dry-type transformer and a dry-type transformer to solve the aforementioned technical problems existing in the prior art, such as... Figures 1-13 As shown, it should be noted that in the coordinate system xyz, x is the radial direction of the coil, which is also the length direction of the pad assembly 10; y is the circumferential direction of the coil, which is also the width direction of the pad assembly 10; and z is the axial direction of the coil, which is also the height direction of the pad assembly 10. This mainly includes the following:

[0054] Example 1:

[0055] Embodiment 1 of this application provides a clamping structure for a dry-type transformer, including:

[0056] The pad assembly 10 has a lower end for pressing the coil and a pressure block 20 fixedly installed on the upper end. The pressure block 20 has a positioning groove 21 in the radial direction of the coil, that is, a positioning groove 21 in the length direction of the pressure block 20. The positioning groove 21 can pass through both ends of the pressure block 20 or not pass through both ends of the pressure block 20.

[0057] In some optional implementations, the pad assembly 10 includes a pad body 11 and a positioning element 12. The lower surface of the pad body 11 has a mounting groove 111 along the x-direction, and a mounting hole is formed in the mounting groove 111. The upper surface of the positioning element 12 has a positioning strip 121 along the x-direction, and a positioning post 122 is provided on the positioning strip 121. The positioning strip 121 is embedded in the mounting groove 111, and the positioning post 122 is inserted into the mounting hole, thereby achieving the positioning and fixing of the positioning element 12 on the pad body 11 and preventing displacement of the positioning element 12. Optionally, the pad body 11 is made of epoxy resin casting. The pad body 11 made of this material has high strength and rigidity, low coefficient of thermal expansion, wide heat resistance range, and is not easily deformed during long-term use.

[0058] In some alternative embodiments, the positioning element 12 is made of silicone rubber and is integrally cast. Positioning elements made of silicone rubber have advantages such as excellent elasticity, good shock absorption, high temperature resistance, and good insulation.

[0059] Optionally, a claw 123 is provided below the positioning member 12. The claw 123 is used to fix the insulating cylinder 300 between the high-voltage coil 220 and the low-voltage coil 210. Due to the good elasticity of silicone rubber, when the pad assembly shifts laterally and longitudinally under short-circuit vibration during transformer operation, the interaction force generated between the claw 123 and the high-voltage coil 220 and the low-voltage coil 210 will only cause elastic deformation and will not break.

[0060] In some alternative embodiments, umbrella-shaped protrusions are provided on both sides of the pad body 11 to increase the creepage distance and disperse the electric field stress.

[0061] In some alternative embodiments, a pressing groove 112 is provided on the upper surface of the pad body 11, and the pressing block 20 is placed in the pressing groove 112, wherein the pressing block 20 is a metal block, such as an iron block.

[0062] The limiting component 30 is arm-shaped. The limiting component 30 includes a first limiting component 31 and a second limiting component 32. The first limiting component 31 and the second limiting component 32 are rotatably mounted in the positioning groove 21, and are positioned relative to each other to define a limiting space 3132. The limiting space 3132 is used to confine the corresponding pressing nail 40 within this space, thus limiting the travel of the pressing nail 40. The movement of the pressing nail 40 within the limiting space 3132 is within the allowable range, ensuring that the pressing nail 40 presses firmly against the pad assembly 10. When the movement of the pressing nail 40 exceeds the limiting space 3132, the machine needs to be stopped for inspection.

[0063] For example, the middle part of the first limiting component 31 and the second limiting component 32 is rotatably installed in the side wall of the positioning groove 21, and the two ends of the first limiting component 31 and the second limiting component 32 are free ends.

[0064] The pressure pin 40 includes a first pressure pin 42 and a second pressure pin 43. The first and second pressure pins 42 and 43 have identical structures. The first pressure pin 42 abuts against the position of the low-voltage coil 210 corresponding to the pad assembly 10, and the second pressure pin 43 abuts against the position of the high-voltage coil 220 corresponding to the pad assembly 10, together achieving the clamping of the pad assembly 10. For example, the lower end of the pressure pin 40 is located in the limiting space 3132 and abuts against the positioning groove 21. This converts the point force applied directly to the pad assembly 10 by the end of the pressure pin 40 into a surface force applied to the pad assembly 10 by the pressure block 20, avoiding stress concentration and damage to the pad assembly 10. The lower end of the pressure pin 40 is provided with limiting holes 41. For example, multiple limiting holes 41 are spaced circumferentially along the lower end of the pressure pin 40. The limiting holes 41 cooperate with the limiting component 30 to limit the pressure pin 40. In some optional embodiments, when the pad assembly 10 is subjected to a vibration force exceeding a preset vibration force, the pad assembly 10 will move along the x and y directions. Due to the presence of the pressure pin 40, when the pad assembly 10 is subjected to a force along the y direction, the lower end of the pressure pin 40 and the contact points on both sides of the positioning groove 21 generate forces in opposite directions. That is, at this time, the pad assembly 10 will be subjected to torque, and the pad assembly 10 will move along the x direction, causing the position of the pressure pin 40 in the positioning groove 21 to change along the x direction. Therefore, in this application, when the pressure pin 40 moves to the first preset position P1 in the positioning groove 21, the pressure pin 40 will push the trigger end of the first limiting component 31, thereby driving the first limiting component 31 to rotate, so that the limiting end of the first limiting component 31 approaches the limiting hole 41, until the limiting end of the first limiting component 31 engages with the limiting hole 41, preventing the movement of the pressure pin 40, thereby pressing the pad assembly 10 and keeping it in the current position to avoid the breakage of the claw 123 and ensure the stability of the entire device. When the pressure pin 40 moves from the first preset position P1 toward the second preset position P2, when the pressure pin 40 is at the second preset position P2, similarly, the pressure pin 40 will push the trigger end of the second limiting component 32 on that side, thereby causing the second limiting component 32 to rotate, so that the limiting end of the second limiting component 32 approaches the limiting hole 41, until the limiting end of the second limiting component 32 is engaged with the limiting hole 41, preventing the pressure pin 40 from moving in that direction, thereby pressing the pressure pin 40 against the pad component 10, keeping it in its current position, and ensuring the stability of the entire device.

[0065] Therefore, this application provides a clamping structure for a dry-type transformer, including a pad assembly 10 and a limiting assembly 30. The limiting assembly 30 is installed in the pressure block 20 above the pad assembly 10. The limiting assembly 30 includes a first limiting assembly 31 and a second limiting assembly 32. The clamping nail 40 clamps the pad assembly 10 by pressing against the pressure block 20. When the pad assembly 10 undergoes lateral and longitudinal displacement under short-circuit vibration during operation, it is converted into movement of the clamping nail 40. When the clamping nail 40 moves to the first preset position, the first limiting assembly 31 engages with the limiting hole 41. When it moves to the second position, the second limiting assembly 32 engages with the limiting hole 41. This prevents the movement of the clamping nail 40, thereby clamping the pad assembly 10 and keeping it in the current position. This avoids cracking and damage to the pad assembly 10 and ensures the stability of the entire structure.

[0066] According to some optional embodiments, the first limiting component 31 and the second limiting component 32 have the same structure, and the first limiting component 31 and the second limiting component 32 are symmetrically arranged along the y-direction, both including:

[0067] The first limiting member 33 and the second limiting member 34 have the same structure, forming a V-shape. A portion of the first limiting member 33 is rotatably mounted on one side of the positioning groove 21, and the second limiting member 34 is rotatably mounted on the opposite side of the positioning groove 21. A portion of the limiting space 3132 is formed between the first limiting member 33 and the second limiting member 34. The end of the first limiting member 33 that abuts against the pressure pin 40 is the first trigger end 331, and the end inserted into the limiting hole 41 of the pressure pin 40 is the first limiting end 332. Similarly, the end of the second limiting member 34 that abuts against the pressure pin 40 is the second trigger end 341, and the end inserted into the limiting hole 41 of the pressure pin 40 is the second limiting end 342. The first trigger end 331 of the first limiting member 33 and the second trigger end 341 of the second limiting member 34 are arranged opposite each other. When the pressing nail 40 moves to the first preset position, when it reaches the preset position, the lower end of the pressing nail 40 will automatically push the first trigger end 331 of the first limiting member 33 and the second trigger end 341 of the second limiting member 34, causing the first limiting member 33 and the second limiting member 34 to rotate. At the same time, the first trigger end 331 and the second trigger end 341 open and move away from each other. The first limiting end 332 of the first limiting member 33 and the second limiting end 342 of the second limiting member 34 automatically move closer to each other and are respectively inserted into the limiting hole 41 to realize the limiting and locking of the pressing nail 40. With this configuration, when the pad assembly 10 is subjected to vibration, the pressure nail 40 can move to automatically open the first limiting member 33 and the second limiting member 34, and rotate it. The first limiting end 332 and the second limiting end 342 are simultaneously inserted into the limiting hole 41 from both sides of the pressure nail 40, thereby limiting and locking the pressure nail 40, pressing the pad assembly 10, ensuring the stability of the overall structure, and avoiding damage to the pad assembly 10.

[0068] It should be noted that when the pressure nail 40 moves to the second preset position, the limiting and locking principle of the second limiting component 32 on the pressure nail 40 is the same as the limiting and locking principle of the first limiting component 31 on the pressure nail 40 when the pressure nail 40 moves to the first position.

[0069] According to some optional embodiments, the first limiting end 332 and the second limiting end 342 have the same structure, both including:

[0070] The first guide surface 3321 and the second guide surface 3322 are arc-shaped surfaces. The first guide surface 3321 and the second guide surface 3322 are connected by a transition surface 3323 at the ends, and the second limiting end 342 can be smoothly inserted into the limiting hole 41 through the first guide surface 3321 and the second guide surface 3322. The dimensions of the first limiting end 332 and the second limiting end 342 gradually decrease towards the end, which facilitates their insertion into and withdrawal from the limiting hole 41.

[0071] According to some optional embodiments, a clearance gap 35 is provided between the first trigger end 331 and the second trigger end 341. The clearance gap 35 prevents the first trigger end 331 and the second trigger end 341 from coming into contact and jamming, thus preventing the pressure pin 40 from being stopped in time. In some optional embodiments, when the first trigger end 331 and the second trigger end 341 are in their initial positions, the size of the clearance gap 35 is smaller than the diameter of the pressure pin 40, allowing the pressure pin 40 to apply sufficient thrust to the first trigger end 331 and the second trigger end 341, causing them to open.

[0072] According to some optional embodiments, the pressure block 20 has symmetrically formed first clearance grooves 22 and second clearance grooves 23 on both sides facing the positioning groove 21. The first clearance grooves 22 and second clearance grooves 23 extend in the x-direction and are arranged parallel to the positioning groove 21. Both the first clearance grooves 22 and second clearance grooves 23 are connected to the positioning groove 21. The first limiting member 33 is installed in the first clearance groove 22 via a rotating shaft 25, and the second limiting member 34 is rotatably installed in the second clearance groove 23. With the setting of the first clearance grooves 22 and second clearance grooves 23, the first limiting member 33 and the second limiting member 34 can avoid interference with the pressure nail 40 when rotating, thus preventing the pressure nail 40 from being locked.

[0073] According to some optional embodiments, a plurality of rotating grooves 24 are provided at intervals on the upper surface of the pressure block 20 at positions corresponding to the first clearance groove 22 and the second clearance groove 23, and the rotating grooves 24 are connected to the first clearance groove 22 and the second clearance groove 23. The rotating shaft 25 is installed in the rotating groove 24. In this way, the rotating shaft 25 can be installed in the rotating groove 24 at a preset position according to the stress conditions of transformers of different specifications, thereby realizing that the limiting component 30 is located at the preset position and limiting and locking the pressure nail 40 in the position, which has a wide range of applications.

[0074] According to some alternative embodiments, a pressure sensor is installed below the pressure block 20 to detect the force on the pad assembly 10.

[0075] In the above scheme, a pressure sensor is placed in the pressure groove 112 to monitor the pressure on each pad assembly 10 in real time, and to promptly determine whether the stress on each pad assembly 10 is abnormal. For example, if the stress on the pad assembly 10 is too high, stress concentration may occur, and the pad assembly 10 may crack or be damaged. In this case, an alarm can be sent to the cloud to initiate a shutdown inspection. If the stress on the pad assembly 10 is too low, the pad assembly 10 is more prone to lateral and longitudinal movement under short-circuit vibration during operation, causing winding instability. In this case, an alarm can be sent to the cloud to initiate a shutdown inspection. This application uses a pressure sensor to monitor and provide feedback on each pad assembly in real time.

[0076] Check whether there are any abnormalities in the stress condition of the block component 10, and take timely warning measures if any abnormalities occur to ensure the normal operation of the transformer.

[0077] In some alternative embodiments, the clamp 60 is provided with a wiring hole, through which the sensing wire of the pressure sensor can be connected to the corresponding detection system. The pressure sensor can also connect to the detection system wirelessly via Bluetooth or other means to transmit information.

[0078] According to some alternative embodiments, a liner 50 is mounted below the pad assembly 10, and the liner 50 has a plurality of hemispherical protrusions 51 spaced apart on the side facing the coil.

[0079] In the above scheme, the pad assembly 10 includes a pad body 11 and a positioning member 12. The claws 123 on the lower surface of the positioning member 12 divide the lower surface of the positioning member 12 into a first lower surface 124 and a second lower surface 125 along the x-direction. The first lower surface 124 is correspondingly disposed with respect to the upper end of the low-voltage coil 210, and the second lower surface 125 is corresponding with the high-voltage coil 220. Correspondingly, the liner 50 includes a first liner 53 and a second liner 54. The first liner 53 is fixedly installed on the first lower surface 124 and abuts against the low-voltage coil 210, and the second liner 54 is fixedly installed on the second lower surface 125 and abuts against the high-voltage coil 220. For example, a positioning hole 126 is provided below the first lower surface 124 and the second lower surface 125, and a positioning protrusion 52 is provided on the upper surface of the first liner 53 and the second liner 54. The first liner 53 is connected to the first lower surface 124 and the second liner 54 is connected to the second lower surface 125 by the insertion and cooperation of the positioning protrusion 52 and the positioning hole 126.

[0080] In some alternative embodiments, the lower surfaces of the first liner 53 and the second liner 54 are provided with a plurality of hemispherical protrusions 51 spaced apart, and the hemispherical protrusions 51 abut against the corresponding high-voltage coil 220 and low-voltage coil 210. When the pad assembly 10 is subjected to vibration, the hemispherical protrusions 51 will be compressed, and at this time, the hemispherical protrusions 51 will embed into the air passages of the high-voltage coil 220 and low-voltage coil 210, increasing the friction between the pad assembly 10 and the high-voltage coil 220 and low-voltage coil 210, thereby reducing the displacement of the pad assembly 10.

[0081] In some alternative embodiments, depending on the force conditions between the low-voltage coil 210 and the pad assembly 10, and between the high-voltage coil 220 and the pad assembly 10, the size and number of hemispherical protrusions 51 distributed on the first liner 53 may differ from the size and number of hemispherical protrusions 51 distributed on the second liner 54.

[0082] In some alternative embodiments, theoretically, the high-voltage coil 220 and the low-voltage coil 210 are flush. However, in actual manufacturing, the high-voltage coil 220 and the low-voltage coil 210 may have height errors, resulting in their surfaces not being flush. This causes the pad assembly 10 above them to tilt and experience uneven stress. In this application, for coils with lower heights, the number of liner plates 50 can be increased below the corresponding pad assembly 10. By stacking multiple liner plates 50, the pad assembly 10 is placed in a horizontal position, resulting in uniform stress. For example, the liner plate 50 has a connecting hole 55 on its surface with a hemispherical protrusion 51. When multiple liner plates 50 are stacked, the positioning protrusion 52 on the upper surface of the lower liner plate 50 can be inserted into the connecting hole 55 of the upper liner plate 50, thus achieving connection between adjacent liner plates 50.

[0083] According to some optional embodiments, a clamping member 60 is also included, which is fixedly connected to the upper end of the pressure pin 40. The clamping member 60 is provided with an adjustment hole 61, which is parallel to the positioning groove 21. The pressure pin 40 can pass through the adjustment hole 61 and abut against the positioning groove 21. A rack 611 is provided on the inner wall of the adjustment hole 61, and the outer wall of the pressure pin 40 rotatably engages with the rack 611 to adjust the position of the pressure pin 40 on the clamping member 60. For example, a first pressure pin 42 and a second pressure pin 43 are installed in the adjustment hole 61. The first pressure pin 42 needs to press against the pad assembly 10 at the corresponding position of the low-voltage coil 210, and the second pressure pin 43 needs to press against the pad assembly 10 at the corresponding position of the high-voltage coil 220. For transformers of different specifications, the diameters of the high-voltage coil 220 and the low-voltage coil 210 are different. In this case, the first clamping pin 42 and the second clamping pin 43 can be rotated. The teeth on the outer walls of the first clamping pin 42 and the second clamping pin 43 mesh with the rack 611 to adjust their positions in the adjustment hole 61. This moves the first clamping pin 42 to the position corresponding to the low-voltage coil 210 and the second clamping pin 43 to the position corresponding to the high-voltage coil 220, thus pressing the pad assembly 10 at that position to ensure the stability of the entire device and prevent winding instability. By setting the adjustment hole 61, the clamping pin 40 can be adjusted to fit various transformer specifications, increasing its applicability.

[0084] In some alternative embodiments, the clamp 60 is provided with reinforcing ribs on both sides of the adjustment hole to improve the strength of the clamp 60 and prevent the clamp 60 from deforming when the stress is too great.

[0085] In some alternative embodiments, the clamp 60 is folded into a single unit from a folding plate, making the structure simpler and requiring no welding.

[0086] Example 2

[0087] Embodiment 2 of this application provides a dry-type transformer, such as Figures 1-13 As shown, a clamping structure for a dry-type transformer, as described in Embodiment 1, is included. Exemplarily, the dry-type transformer includes a coil 200, and the clamping structure is disposed above the coil 200 to clamp the coil 200 and ensure its stability. The coil 200 includes a low-voltage coil 210 and a high-voltage coil 220. A first clamping pin 42 presses against the pad assembly 10 at the position corresponding to the low-voltage coil 210, and a second clamping pin 43 presses against the pad assembly 10 at the position corresponding to the high-voltage coil 220, to ensure overall stability.

[0088] The coil 200 is sleeved on the iron core 400, and the clamp 60 is located above the coil 200 to clamp the upper and lower ends of the iron core 400.

[0089] A claw 123 is provided below the positioning component 12. The claw 123 is used to fix the insulating cylinder 300 between the high-voltage coil 220 and the low-voltage coil 210. Due to the good elasticity of silicone rubber, when the pad assembly shifts laterally and longitudinally under short-circuit vibration during transformer operation, the interaction force generated between the claw 123 and the high-voltage coil 220 and the low-voltage coil 210 will only cause elastic deformation and will not break.

[0090] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A clamping structure for a dry-type transformer, characterized in that, include: The pad assembly (10) has a lower end for pressing the coil and a pressure block (20) fixedly installed on the upper end. The pressure block (20) has a positioning groove (21) along the radial direction of the coil. The limiting component (30) includes a first limiting component (31) and a second limiting component (32). The first limiting component (31) and the second limiting component (32) are rotatably installed in the positioning groove (21), and the first limiting component (31) and the second limiting component (32) are relatively positioned to define a limiting space (3132). A pressure pin (40) is provided at its lower end in the limiting space (3132) and abuts against the positioning groove (21). A limiting hole (41) is provided at the lower end of the pressure pin (40). When the pressure pin (40) is in the first preset position, the first limiting component (31) is engaged with the limiting hole (41). When the pressure pin (40) is in the second preset position, the second limiting component (32) is engaged with the limiting hole (41). The first limiting component (31) and the second limiting component (32) have the same structure, both including: The first limiting member (33) and the second limiting member (34) are rotatably mounted on one side of the positioning groove (21) and the second limiting member (34) is rotatably mounted on the opposite side of the positioning groove (21). The first trigger end (331) of the first limiting member (33) and the second trigger end (341) of the second limiting member (34) are arranged opposite to each other. When the pressing nail (40) moves to the first preset position, the pressing nail (40) pushes the first limiting member (33) and the second limiting member (34) to rotate. The first trigger end (331) and the second trigger end (341) move away from each other. The first limiting end (332) of the first limiting member (33) and the second limiting end (342) of the second limiting member (34) move closer to each other and are respectively inserted into the limiting hole (41). It also includes a clamp (60), which is fixedly connected to the upper end of the pressure pin (40). The clamp (60) is provided with an adjustment hole (61), which is parallel to the positioning groove (21). The pressure pin (40) passes through the adjustment hole (61) and abuts against the positioning groove (21). A rack (611) is provided on the inner wall of the adjustment hole (61). The outer wall of the pressure pin (40) is rotatably engaged with the rack (611) to adjust the position of the pressure pin (40) on the clamp (60).

2. The clamping structure as described in claim 1, characterized in that, The first limiting end (332) and the second limiting end (342) have the same structure, both including: The first guide surface (3321) and the second guide surface (3322) are connected by a transition surface (3323) at the end. The second limiting end (342) is inserted into the limiting hole (41) through the first guide surface (3321) and the second guide surface (3322).

3. The clamping structure as described in claim 1, characterized in that, There is a clearance gap (35) between the first trigger end (331) and the second trigger end (341).

4. The clamping structure as described in claim 1, characterized in that, The pressure block (20) is symmetrically provided with a first clearance groove (22) and a second clearance groove (23) on both sides facing the positioning groove (21). The first clearance groove (22) and the second clearance groove (23) are both connected to the positioning groove (21). The first limiting member (33) is installed in the first clearance groove (22) through a rotating shaft (25), and the second limiting member (34) is installed in the second clearance groove (23) by rotation.

5. The clamping structure as described in claim 4, characterized in that, The upper surface of the pressure block (20) is provided with a plurality of rotating grooves (24) at intervals at positions corresponding to the first clearance groove (22) and the second clearance groove (23), and the rotating grooves (24) are connected to the first clearance groove (22) and the second clearance groove (23), and the rotating shaft (25) is installed in the rotating grooves (24).

6. The clamping structure as described in claim 1, characterized in that, A pressure sensor is installed below the pressure block (20) to detect the force on the pad assembly (10).

7. The clamping structure as described in claim 1, characterized in that, A liner (50) is installed below the pad assembly (10), and the liner (50) has a plurality of hemispherical protrusions (51) spaced apart on the side facing the coil.

8. A dry-type transformer, characterized in that, Includes the clamping structure of a dry-type transformer as described in any one of claims 1-7.

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