Compressing structure of dry-type transformer and dry-type transformer

Abstract

The invention is suitable for the technical field of dry-type transformers, and provides a dry-type transformer pressing structure and a dry-type transformer, the dry-type transformer pressing structure comprises a cushion block assembly, the lower end of the cushion block assembly is used for pressing a coil, the upper end of the cushion block assembly is fixedly provided with a pressing block, and the pressing block is provided with a positioning groove in the radial direction of the coil; the limiting assemblies comprise the first limiting assembly and the second limiting assembly, and the first limiting assembly and the second limiting assembly are rotationally installed in the positioning groove; the lower end of the pressing nail is located in the limiting space and abuts against the positioning groove, a limiting hole is formed in the lower end of the pressing nail, when the pressing nail is located at the first preset position, the first limiting assembly is clamped with the limiting hole, and when the pressing nail is located at the second preset position, the second limiting assembly is clamped with the limiting hole. The cushion block assembly is pressed, so that the cushion block assembly is kept at the current position, cracking and damage of the cushion block assembly are avoided, and the stability of the whole structure is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dry-type transformers, in particular to a dry-type transformer and a compression structure of the dry-type transformer. BACKGROUND

[0002] Dry-type transformers are widely used in key scenarios such as high-rise buildings, subways, and new energy power stations due to their characteristics of oil-free and convenient maintenance. However, when a short-circuit fault occurs in the power grid, especially a three-phase short-circuit or a two-phase short-circuit, the dry-type transformer will bear a huge electric force (the axial force can reach tens of thousands of Newton, and the radial force can reach thousands of Newton), which can easily cause problems such as winding deformation, support bar fracture, insulation pad displacement and fracture, and even equipment burnout in severe cases.

[0003] The insulation pad, as a key force transmission component between the winding and the core and the support bar, directly determines the overall short-circuit resistance. The existing technology has the following defects: The traditional rectangular pad has a small contact area with the winding, and the local pressure exceeds the maximum during a short circuit. The pad is only fixed by a single compression pin at a single point. The pre-tightening force of the compression pin acts on the pad, causing stress concentration and easily causing the pad to crack. The traditional pad is prone to horizontal and vertical displacement under short-circuit vibration during operation, causing the winding to lose stability. The insulation pad fixing clamps are integrally formed. When the coil is displaced, the clamps and the high-voltage and low-voltage windings generate interaction forces. In severe cases, the stress concentration at the root of the clamp can cause the clamp to break. The height error of the high-voltage and low-voltage coils causes the pad to tilt. The traditional structure cannot dynamically compensate for the tilt, exacerbating local overheating. There is a lack of real-time pressure feedback mechanism, and the pre-tightening force decay cannot be timely warned. SUMMARY

[0004] The purpose of the present application is to provide a dry-type transformer and a compression structure of the dry-type transformer to solve the above technical problems in the prior art. The main content includes the following: The first aspect of the present application provides a compression structure of a dry-type transformer, comprising: a pad assembly, the lower end of the pad assembly being used to compress a coil, and the upper end of the pad assembly being fixedly installed with a compression block, the compression block being provided with a positioning slot in the radial direction of the coil; a limiting assembly, the limiting assembly comprising a first limiting assembly and a second limiting assembly, the first limiting assembly and the second limiting assembly being rotatably installed in the positioning slot, and the first limiting assembly and the second limiting assembly being oppositely arranged to define a limiting space; a compression pin, the lower end of the compression pin being located in the limiting space and abutting against the positioning slot, the lower end of the compression pin being provided with a limiting hole, the first limiting assembly being engaged with the limiting hole when the compression pin is located at a first preset position, and the second limiting assembly being engaged with the limiting hole when the compression pin is located at a second preset position.

[0005] Further, in order to better realize the present application, the following arrangement is adopted: the first limiting component and the second limiting component are identical in structure, and each comprises: The first limiting member is rotatably installed on one side of the positioning groove, and the second limiting member is rotatably installed on the opposite side of the positioning groove.

[0006] Further, in order to better realize the present application, the following arrangement is adopted: the first limiting component and the second limiting component are identical in structure, and each comprises: The first guide surface and the second guide surface are connected through a transition surface at the end portion, and the second limiting end can be inserted into the limiting hole through the first guide surface and the second guide surface.

[0007] Further, in order to better realize the present application, the following arrangement is adopted: the first limiting component and the second limiting component are identical in structure, and each comprises:

[0008] Further, in order to better realize the present application, the following arrangement is adopted: the first limiting component and the second limiting component are identical in structure, and each comprises:

[0009] Further, in order to better realize the present application, the following arrangement is adopted: the first limiting component and the second limiting component are identical in structure, and each comprises:

[0010] Further, in order to better realize the present application, the following arrangement is adopted: the first limiting component and the second limiting component are identical in structure, and each comprises:

[0011] Further, in order to better realize the present application, the following arrangement is adopted: the first limiting component and the second limiting component are identical in structure, and each comprises:

[0012] Further, in order to better achieve the present application, the following arrangement structure is adopted: further comprising a clamp, which is fixedly connected with the upper end of the pressing nail, wherein an adjusting hole is arranged on the clamp, the adjusting hole is arranged in parallel with the positioning groove, the pressing nail can abut against the positioning groove through the adjusting hole, a rack is arranged on the inner wall of the adjusting hole, and the outer wall of the pressing nail is rotationally matched with the rack, so as to adjust the position of the pressing nail on the clamp.

[0013] The second aspect of the present application provides a dry-type transformer comprising the compression structure of the dry-type transformer as described above.

[0014] The present application has at least the following technical effects relative to the prior art: The present application provides a compression structure of a dry-type transformer, which comprises a cushion block assembly and a limiting assembly, the limiting assembly is installed in a pressing block above the cushion block assembly, the limiting assembly comprises a first limiting assembly and a second limiting assembly, the pressing nail is pressed to compress the cushion block assembly, when the cushion block assembly is horizontally and vertically offset under short-circuit vibration during operation, the offset is converted into movement of the pressing nail, when the pressing nail moves to a first preset position, the first limiting assembly is clamped with the limiting hole, when the pressing nail moves to a second position, the second limiting assembly is clamped with the limiting hole, so that the movement of the pressing nail is prevented, the cushion block assembly is compressed, and the cushion block assembly is kept at the current position, so that the cracking and damage of the cushion block assembly are avoided, and the stability of the entire structure is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application or the prior art description. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0016] Figure 1 is the overall schematic view of the compression structure in the present application; Figure 2 is Figure 1 is an enlarged view of A part in the present application; Figure 3 is the exploded view of the compression structure in the present application; Figure 4 is the structural schematic view of the limiting assembly in the present application; Figure 5 is the structural schematic view of the limiting end in the present application; Figure 6 is the left view of the lining plate in the present application; Figure 7 is the first three-dimensional schematic view of the lining plate in the present application; Figure 8 is a second perspective view of the lining plate in the present application; Figure 9 is a structural view of the positioning member in the present application; Figure 10 is a structural view of the clamping member; Figure 11 is Figure 10 is an enlarged view of part B in the present application; Figure 12 is a structural view of the dry-type transformer in the present application; Figure 13 is Figure 12 is an enlarged view of part C in the present application.

[0017] in the figure: 10, cushion block assembly; 11, cushion block body; 111, mounting groove; 112, pressing block groove; 12, positioning member; 121, positioning strip; 122, positioning column; 123, clamping jaw; 124, first lower surface; 125, second lower surface; 126, positioning hole; 20, pressing block; 21, positioning groove; 22, first avoiding groove; 23, second avoiding groove; 24, rotating groove; 25, rotating shaft; 30, limiting assembly; 31, first limiting assembly; 32, second limiting assembly; 3132, limiting space; 33, first limiting member; 331, first triggering end; 332, first limiting end; 3321, first guide surface; 3322, second guide surface; 3323, transition surface; 34, second limiting member; 341, second triggering end; 342, second limiting end; 35, avoiding gap; 40, pressing pin; 41, limiting hole; 42, first pressing pin; 43, second pressing pin; 50, lining plate; 51, semispherical protrusion; 52, positioning protrusion; 53, first lining plate; 54, second lining plate; 55, connecting hole; 60, clamping member; 61, adjusting hole; 611, gear rack.

[0018] 200, coil; 210, low-voltage coil; 220, high-voltage coil.

[0019] 300, insulating cylinder; 400, iron core. DETAILED DESCRIPTION

[0020] The following description provides many different embodiments, or examples, for implementing different features of the application. Specific examples are described in the following detail so as to provide a thorough understanding of the application. The described embodiments are merely examples of the application and are not intended to limit the application.

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0022] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In the present application, unless specifically defined and limited otherwise, the first feature above or below the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0024] The traditional rectangular pad has a small contact area with the winding, and when the local pressure is too large during short circuit, it only relies on a single press pin for single-point fixing, the press pin pre-tightening force acts on the pad, resulting in stress concentration, which easily causes the pad to crack; the traditional pad is prone to horizontal and vertical displacement during operation under short circuit vibration, causing the winding to lose stability. The insulating pad fixing clamping jaw is integrally formed, and when the coil is displaced, the clamping jaw and the high and low voltage winding will generate an interaction force, and when the displacement is serious, the stress at the root of the clamping jaw will be concentrated, causing the clamping jaw to break; there is also a height difference between the high and low voltage coils, and the height difference between the high and low voltage coils will cause the pad to tilt towards the side with lower height, and the traditional structure cannot dynamically compensate for this height difference, which will exacerbate the local overheating of the coil; there is a lack of real-time pressure feedback mechanism, and the pre-tightening force decay cannot be timely warned.

[0025] In the prior art, two pressing nails are usually used to press the cushion block, that is, two pressing nails are arranged on one cushion block to press simultaneously. The upper ends of the two pressing nails are fixed through the clamp, and the lower ends abut on the cushion block. The two pressing nails abut on the high-voltage coil and the low-voltage coil of the cushion block respectively, but the diameters of the high-voltage coil and the low-voltage coil are different for different specifications of the transformer, and the abutment positions of the two pressing nails on the cushion block also need to be different. However, the distance between the two pressing nails on each clamp is fixed, so the clamp cannot adapt to different specifications of the transformer.

[0026] In view of this, the purpose of the present application is to provide a pressing structure of a dry-type transformer and a dry-type transformer to solve the above technical problems existing in the prior art, such as Figures 1-13 As shown, it should be noted that in the coordinate system x-y-z, x is the radial direction of the coil and also the length direction of the cushion block assembly 10; y is the circumferential direction of the coil and also the width direction of the cushion block assembly 10; z is the axial direction of the coil and also the height direction of the cushion block assembly 10. The main contents include the following: Embodiment one: The embodiment one of the present application provides a pressing structure of a dry-type transformer, which comprises: The lower end of the cushion block assembly 10 is used to press the coil, and the upper end is fixedly installed with a pressing block 20. The pressing block 20 is provided with a positioning groove 21 in the radial direction of the coil, that is, the positioning groove 21 is provided in the length direction of the pressing block 20. The positioning groove 21 can penetrate through both ends of the pressing block 20, or can not penetrate through both ends of the pressing block 20.

[0027] In some optional embodiments, the cushion block assembly 10 comprises a cushion block body 11 and a positioning member 12. The lower surface of the cushion block body 11 is provided with a mounting groove 111 in the x direction, and the mounting groove 111 is provided with a mounting hole. The upper surface of the positioning member 12 is provided with a positioning strip 121 in the x direction, and the positioning strip 121 is provided with a positioning column 122. The positioning strip 121 is embedded in the mounting groove 111, and then the positioning column 122 is inserted into the mounting hole, so as to realize the positioning and fixing of the positioning member 12 on the cushion block body 11, and prevent the displacement of the positioning member 12. Optionally, the material of the cushion block body 11 is epoxy resin pouring. The cushion block body 11 made of this material has high strength and rigidity, low thermal expansion coefficient, wide heat resistance range, and is not easy to deform during long-term use.

[0028] In some optional embodiments, the material of the positioning member 12 is silicone rubber, which is integrally formed by pouring. The positioning member made of silicone rubber has excellent elasticity, good shock absorption performance, high temperature resistance, and good insulation.

[0029] Optionally, the lower part of the positioning member 12 is provided with a clamping jaw 123, which 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 the silicone rubber, when the transformer is running, the clamping jaw 123 and the high-voltage coil 220 and the low-voltage coil 210 generate interaction force when the short-circuit vibration causes the lateral and longitudinal displacement of the cushion block assembly, only elastic deformation will occur, and no fracture will occur.

[0030] In some optional embodiments, the two sides of the cushion block body 11 are provided with umbrella skirt bosses, which are used to improve the creepage distance and disperse the electric field stress.

[0031] In some optional embodiments, the upper surface of the cushion block body 11 is provided with a pressing block groove 112, and the pressing block 20 is placed in the pressing block groove 112, wherein the pressing block 20 is a metal block, for example, an iron block.

[0032] The limiting assembly 30 is arm-shaped. The limiting assembly 30 includes a first limiting assembly 31 and a second limiting assembly 32, which are respectively rotationally installed in the positioning groove 21, and the first limiting assembly 31 and the second limiting assembly 32 are oppositely arranged to define a limiting space 3132, which is used to limit the corresponding pressing nail 40 in the space, that is, to limit the movement stroke of the pressing nail 40. The movement of the pressing nail 40 within the limiting space 3132 belongs to the allowable movement range, at this time, it can be guaranteed that the pressing nail 40 is pressed against the cushion block assembly 10. When the movement of the pressing nail 40 exceeds the limiting space 3132, it is necessary to stop the machine to check the device.

[0033] For example, the middle part of the first limiting assembly 31 and the second limiting assembly 32 is rotationally installed in the side wall of the positioning groove 21, and the two ends of the first limiting assembly 31 and the second limiting assembly 32 are free ends.

[0034] The pressing nails 40 include first pressing nails 42 and second pressing nails 43, which have the same structure. The first pressing nails 42 are used to abut the positions of the corresponding low-pressure coils 210 of the cushion block assembly 10, and the second pressing nails 43 are used to abut the positions of the corresponding high-pressure coils 220 of the cushion block assembly 10, so as to jointly achieve the pressing of the cushion block assembly 10. For example, the lower ends of the pressing nails 40 are located in the limiting space 3132 and abut the positioning groove 21, so that the point force applied by the end of the pressing nail 40 to the cushion block assembly 10 can be converted into a planar force applied by the pressing block 20 to the cushion block assembly 10, thereby avoiding stress concentration and damage to the cushion block assembly 10. The lower end of the pressing nail 40 is provided with a limiting hole 41. For example, the lower end of the pressing nail 40 is provided with a plurality of limiting holes 41 at intervals in the circumferential direction, and the limiting holes 41 are used to cooperate with the limiting assembly 30 to limit the pressing nail 40. In some optional embodiments, when the cushion block assembly 10 is subjected to a vibration force exceeding a preset vibration force, the cushion block assembly 10 will move in the x direction and the y direction. Due to the presence of the pressing nail 40, when the cushion block assembly 10 is subjected to a force in the y direction, the lower end of the pressing nail 40 will generate a force in the opposite direction at the contact position on both sides of the positioning groove 21, that is, the cushion block assembly 10 will be subjected to a torque, and the cushion block assembly 10 will move in the x direction, causing the position of the pressing nail 40 in the positioning groove 21 to change in the x direction. Therefore, in this application, when the pressing nail 40 moves to the first preset position P1 in the positioning groove 21, the pressing nail 40 will push the trigger end of the first limiting assembly 31, thereby driving the first limiting assembly 31 to rotate, so that the limiting end of the first limiting assembly 31 approaches the limiting hole 41, until the limiting end of the first limiting assembly 31 is clamped with the limiting hole 41, thereby preventing the movement of the pressing nail 40, achieving the pressing of the cushion block assembly 10, and keeping the cushion block assembly 10 at the current position to avoid the breakage of the clamping jaw 123 and ensure the stability of the entire device. When the pressing nail 40 moves from the first preset position P1 to the second preset position P2, when the pressing nail 40 is located at the second preset position P2, the pressing nail 40 will push the trigger end of the second limiting assembly 32 on the same side, thereby driving the second limiting assembly 32 to rotate, so that the limiting end of the second limiting assembly 32 approaches the limiting hole 41, until the limiting end of the second limiting assembly 32 is clamped with the limiting hole 41, thereby preventing the movement of the pressing nail 40 in the direction, achieving the pressing of the cushion block assembly 10 by the pressing nail 40, keeping the cushion block assembly 10 at the current position, and ensuring the stability of the entire device.

[0035] Therefore, the application provides a compression structure of a dry-type transformer, which comprises a cushion block assembly 10 and a limiting assembly 30 installed in a pressing block 20 above the cushion block assembly 10, the limiting assembly 30 comprises a first limiting assembly 31 and a second limiting assembly 32, a pressing pin 40 is used to compress the cushion block assembly 10 by pressing the pressing block 20, when the cushion block assembly 10 is laterally and longitudinally deviated due to short-circuit vibration during operation, the deviation is converted into the movement of the pressing pin 40, when the pressing pin 40 moves to a first preset position, the first limiting assembly 31 is clamped with a limiting hole 41, when the pressing pin 40 moves to a second position, the second limiting assembly 32 is clamped with the limiting hole 41, so that the movement of the pressing pin 40 is prevented, the cushion block assembly 10 is compressed, and the cushion block assembly 10 is kept at the current position, so that the cracking and damage of the cushion block assembly 10 are avoided, and the stability of the whole structure is ensured.

[0036] According to some optional embodiments, the first limiting assembly 31 and the second limiting assembly 32 are the same in structure, and the first limiting assembly 31 and the second limiting assembly 32 are symmetrically arranged along the y direction, and both of them comprise: The first limiting member 33 and the second limiting member 34 are also the same in structure and are V-shaped. The first limiting member 33 is partially rotationally installed on one side of the positioning groove 21, and the second limiting member 34 is rotationally installed on the opposite side of the positioning groove 21, and the first limiting member 33 and the second limiting member 34 form part of the limiting space 3132. One end of the first limiting member 33 abutting against the pressing pin 40 is a first trigger end 331, and one end of the first limiting member 33 inserted into the limiting hole 41 of the pressing pin 40 is a first limiting end 332. Similarly, one end of the second limiting member 34 abutting against the pressing pin 40 is a second trigger end 341, and one end of the second limiting member 34 inserted into the limiting hole 41 of the pressing pin 40 is a second limiting end 342. The first trigger end 331 of the first limiting member 33 is arranged opposite to the second trigger end 341 of the second limiting member 34. When the pressing pin 40 moves to the first preset position, the lower end of the pressing pin 40 automatically pushes the first trigger end 331 of the first limiting member 33 and the second trigger end 341 of the second limiting member 34, drives the first limiting member 33 and the second limiting member 34 to rotate, and at the same time, the first trigger end 331 and the second trigger end 341 are opened 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 close to each other and are respectively inserted into the limiting hole 41, and the limiting and locking of the pressing pin 40 are realized. Through such an arrangement, when the cushion block assembly 10 is subjected to a vibration force, the pressing pin 40 can move, automatically open the first limiting member 33 and the second limiting member 34, and make them rotate, the first limiting end 332 and the second limiting end 342 are simultaneously inserted into the limiting hole 41 from both sides of the pressing pin 40, the limiting and locking of the pressing pin 40 are realized, the cushion block assembly 10 is compressed, the stability of the whole structure is ensured, and the damage of the cushion block assembly 10 is avoided.

[0037] It should be noted that when the pressing nail 40 moves to the second preset position, the limiting and locking principle of the second limiting assembly 32 to the pressing nail 40 is the same as that of the first limiting assembly 31 to the pressing nail 40 when the pressing nail 40 moves to the first position.

[0038] According to some optional embodiments, the first limiting end 332 and the second limiting end 342 have the same structure, and both include: The first guide surface 3321 and the second guide surface 3322 are arc surfaces. The first guide surface 3321 and the second guide surface 3322 are connected through the transition surface 3323 at the end portion, 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 first limiting end 332 and the second limiting end 342 gradually decrease in size along the direction close to the end portion, facilitating their insertion into and exit from the limiting hole 41.

[0039] According to some optional embodiments, the first trigger end 331 and the second trigger end 341 have an avoiding gap 35 therebetween. The avoiding gap 35 can avoid the first trigger end 331 and the second trigger end 341 from abutting when they are close to each other, so as to prevent the situation of being stuck and failing to timely limit the pressing nail 40. In some optional embodiments, the size of the avoiding gap 35 is smaller than the diameter of the pressing nail 40 when the first trigger end 331 and the second trigger end 341 are in the initial position, so as to facilitate the pressing nail 40 to exert sufficient pushing force on the first trigger end 331 and the second trigger end 341, and make the first trigger end 331 and the second trigger end 341 open.

[0040] According to some optional embodiments, the pressing block 20 is symmetrically provided with the first avoiding slot 22 and the second avoiding slot 23 on both sides of the positioning groove 21, and the first avoiding slot 22 and the second avoiding slot 23 extend along the x direction and are parallel to the positioning groove 21. The first avoiding slot 22 and the second avoiding slot 23 are both in communication with the positioning groove 21, the first limiting piece 33 is installed in the first avoiding slot 22 through the rotating shaft 25, and the second limiting piece 34 is installed in the second avoiding slot 23 through rotation. Through the arrangement of the first avoiding slot 22 and the second avoiding slot 23, the first limiting piece 33 and the second limiting piece 34 can avoid each other when rotating, so as to avoid interference with the pressing nail 40 and fail to limit and lock the pressing nail 40.

[0041] According to some optional embodiments, the upper surface of the pressing block 20 is provided with a plurality of rotating grooves 24 at positions corresponding to the first and second avoiding grooves 22 and 23, respectively, and the rotating grooves 24 are in communication with the first and second avoiding grooves 22 and 23, and the rotating shaft 25 is installed in the rotating grooves 24. In this way, the rotating shaft 25 can be installed in the rotating grooves 24 at the preset positions according to the stress conditions of transformers of different specifications, so as to realize that the limiting assembly 30 is located at the preset positions to limit and lock the pressing nails 40 at the positions, and the range of adaptation is wide.

[0042] According to some optional embodiments, a pressure sensor is installed below the pressing block 20 for detecting the stress of the cushion block assembly 10.

[0043] In the above scheme, the pressure sensing sheet is placed in the pressing block groove 112, the pressure of each cushion block assembly 10 can be monitored in real time, and it can be judged in time whether the stress of each cushion block assembly 10 is abnormal. For example, if the stress of the cushion block assembly 10 is too large, stress concentration occurs, the cushion block assembly 10 may be cracked or damaged, at this time, an alarm can be sent to the cloud for shutdown inspection; if the stress of the cushion block assembly 10 is too small, the cushion block assembly 10 is more likely to move horizontally and vertically under the vibration of short circuit during operation, which may cause the instability of the winding, at this time, an alarm can be sent to the cloud for shutdown inspection. The pressure sensor provided in the present application can monitor and feedback the stress of each cushion block assembly 10 in real time, and when an abnormality occurs, timely warning processing is performed to ensure the normal operation of the transformer.

[0044] In some optional embodiments, the clamping piece 60 is provided with a wiring hole, and the sensing line of the pressure sensor can pass through the wiring hole and be connected to the corresponding detection system. The pressure sensor can also be connected to the detection system through a wireless connection such as Bluetooth to transmit information.

[0045] According to some optional embodiments, a backing plate 50 is installed below the cushion block assembly 10, and a plurality of semispherical protrusions 51 are distributed on the side of the backing plate 50 facing the coil.

[0046] ​In the above scheme, the cushion block assembly 10 comprises a cushion block body 11 and a positioning member 12, the clamping jaw 123 on the lower surface of the positioning member 12 divides 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 arranged corresponding to the upper end of the low-voltage coil 210, and the second lower surface 125 corresponds to the high-voltage coil 220. Correspondingly, the lining plate 50 comprises a first lining plate 53 and a second lining plate 54, the first lining plate 53 is fixedly installed on the first lower surface 124 and abuts against the low-voltage coil 210, and the second lining plate 54 is fixedly installed on the second lower surface 125 and abuts against the high-voltage coil 220. Exemplarily, the first lower surface 124 and the second lower surface 125 are provided with positioning holes 126 below, and the upper surfaces of the first lining plate 53 and the second lining plate 54 are provided with positioning protrusions 52, the first lining plate 53 and the second lining plate 54 are connected to the first lower surface 124 and the second lower surface 125 respectively through the insertion and cooperation of the positioning protrusions 52 and the positioning holes 126.

[0047] In some optional embodiments, a plurality of semispherical protrusions 51 are arranged on the lower surfaces of the first lining plate 53 and the second lining plate 54, and the semispherical protrusions 51 abut against the corresponding high-voltage coil 220 and low-voltage coil 210. When the cushion block assembly 10 is subjected to a vibration force, the semispherical protrusions 51 will be extruded, at this time, the semispherical protrusions 51 will be embedded in the air passages of the high-voltage coil 220 and the low-voltage coil 210, thereby increasing the friction between the cushion block assembly 10 and the high-voltage coil 220 and the low-voltage coil 210, and further reducing the deviation of the cushion block assembly 10.

[0048] In some optional embodiments, according to the force conditions between the low-voltage coil 210 and the cushion block assembly 10 and the force conditions between the high-voltage coil 220 and the cushion block assembly 10, the size and number of the semispherical protrusions 51 distributed on the first lining plate 53 can be different from the size and number of the semispherical protrusions 51 distributed on the second lining plate 54.

[0049] In some optional embodiments, theoretically, the high-voltage coil 220 and the low-voltage coil 210 are arranged flush, but in fact, there will be errors in the height of the high-voltage coil 220 and the low-voltage coil 210 actually made, which will cause the surfaces of the high-voltage coil 220 and the low-voltage coil 210 to be not flush, and will cause the cushion block assembly 10 above to be inclined and subjected to uneven force. In this application, for coils with low height, the number of lining plates 50 can be increased below the corresponding cushion block assembly 10, and the cushion block assembly 10 is kept in a horizontal position and subjected to uniform force through the superposition of multiple lining plates 50. Exemplarily, the lining plate 50 is provided with a connecting hole 55 on the surface with the semispherical protrusion 51, and when multiple lining plates 50 are superposed, the positioning protrusion 52 on the upper surface of the lining plate 50 located below can be inserted into the connecting hole 55 of the lining plate 50 located above, thereby realizing the connection between the two adjacent lining plates 50.

[0050] According to some optional embodiments, a clamp 60 is further included, and the clamp 60 is fixedly connected with the upper end of the pressing nail 40. The clamp 60 is provided with an adjusting hole 61, and the adjusting hole 61 is arranged in parallel with the positioning groove 21. The pressing nail 40 can abut against the positioning groove 21 through the adjusting hole 61. The inner wall of the adjusting hole 61 is provided with a rack 611, and the outer wall of the pressing nail 40 is rotationally matched with the rack 611, so as to adjust the position of the pressing nail 40 on the clamp 60. For example, the first pressing nail 42 and the second pressing nail 43 are installed in the adjusting hole 61. The first pressing nail 42 needs to abut against the cushion block assembly 10 at the corresponding position of the low-voltage coil 210, and the second pressing nail 43 needs to abut against the cushion block assembly 10 at the corresponding position of the high-voltage coil 220. For different specifications of the transformer, the diameters of the high-voltage coil 220 and the low-voltage coil 210 are different. At this time, the first pressing nail 42 and the second pressing nail 43 can be rotated. The teeth on the outer wall of the first pressing nail 42 and the second pressing nail 43 are in meshing cooperation with the rack 611, so as to adjust the positions of the first pressing nail 42 and the second pressing nail 43 in the adjusting hole 61. The first pressing nail 42 is moved to the corresponding position of the low-voltage coil 210, and the second pressing nail 43 is moved to the corresponding position of the high-voltage coil 220. The cushion block assembly 10 at the position is pressed, so as to ensure the stability of the whole device and avoid instability of the winding. Through the arrangement of the adjusting hole 61, the position of the pressing nail 40 on the clamp 60 can be adjusted, so as to adapt to transformers of various specifications, and the application range is increased.

[0051] In some optional embodiments, the clamp 60 is provided with a reinforcing rib on both sides of the adjusting hole, so as to improve the strength of the clamp 60 and prevent the clamp 60 from being deformed due to excessive stress.

[0052] In some optional embodiments, the clamp 60 is integrally folded by a folding plate without welding structure, which is simpler.

[0053] Embodiment two The embodiment two of the present application provides a dry-type transformer, which comprises a pressing structure of the dry-type transformer as shown in the embodiment one. Figures 1-13 As shown, the dry-type transformer comprises a coil 200, and the pressing structure is arranged above the coil 200 and used for pressing the coil 200 to ensure the stability of the coil 200. The coil 200 comprises a low-voltage coil 210 and a high-voltage coil 220. The first pressing nail 42 abuts against the cushion block assembly 10 at the corresponding position of the low-voltage coil 210, and the second pressing nail 43 abuts against the cushion block assembly 10 at the corresponding position of the high-voltage coil 220, so as to ensure the stability of the whole device.

[0054] The coil 200 is sleeved on the iron core 400, and the clamp 60 is located above the coil 200 and used for clamping the upper and lower ends of the iron core 400.

[0055] The lower part of the positioning member 12 is provided with a clamping jaw 123, which 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 the silicone rubber, when the transformer operates, the clamping jaw 123 and the high-voltage coil 220 and the low-voltage coil 210 generate interaction force when the short-circuit vibration under the cushion block assembly occurs lateral and longitudinal deviation, only elastic deformation will occur, and no fracture will occur.

[0056] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus including the element. In addition, it should be pointed out that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0057] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A compacting structure for a dry-type transformer, characterized in that: include: A cushion block assembly (10), wherein the lower end of the cushion block assembly (10) is used to compress the coil, and a pressing block (20) is fixedly mounted on the upper end, and the pressing block (20) is provided with a positioning groove (21) along the radial direction of the coil; A limiting assembly (30), the limiting assembly (30) comprising a first limiting assembly (31) and a second limiting assembly (32), the first limiting assembly (31) and the second limiting assembly (32) being rotatably mounted in the positioning groove (21), and the first limiting assembly (31) and the second limiting assembly (32) being relatively arranged to define a limiting space (3132); A pressure pin (40), the lower end of the pressure pin (40) is located in the limiting space (3132) and abuts against the positioning groove (21), and a limiting hole (41) is provided at the lower end of the pressure pin (40). When the pressure pin (40) is located at a first preset position, the first limiting component (31) is engaged with the limiting hole (41); when the pressure pin (40) is located at a second preset position, the second limiting component (32) is engaged with the limiting hole (41).

2. The compression structure according to claim 1, wherein: The first limiting assembly (31) and the second limiting assembly (32) have the same structure, and both include: A first limiting member (33) and a second limiting member (34), wherein the first limiting member (33) is rotatably mounted on one side of the positioning slot (21), and the second limiting member (34) is rotatably mounted on the opposite side of the positioning slot (21), and the first triggering end (331) of the first limiting member (33) and the second triggering end (341) of the second limiting member (34) are arranged opposite to each other. When the pressing pin (40) moves toward the first preset position, the pressing pin (40) pushes the first limiting member (33) and the second limiting member (34) to rotate, and the first triggering end (331) and the second triggering 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) approach each other and are respectively inserted into the limiting hole (41).

3. The compression structure according to claim 2, wherein: The first limiting end (332) and the second limiting end (342) have the same structure, both comprising: A first guide surface (3321) and a second guide surface (3322), wherein the first guide surface (3321) and the second guide surface (3322) are connected via a transition surface (3323) at the end portion, and the second limiting end (342) can be inserted into the limiting hole (41) via the first guide surface (3321) and the second guide surface (3322).

4. The compression structure according to claim 2, wherein: There is an avoidance gap (35) between the first trigger end (331) and the second trigger end (341).

5. The compression structure according to claim 2, wherein: The pressing block (20) is symmetrically provided with a first avoidance groove (22) and a second avoidance groove (23) on both sides of the positioning groove (21); the first avoidance groove (22) and the second avoidance groove (23) are both communicated with the positioning groove (21); the first limiting member (33) is mounted on the first avoidance groove (22) via a rotating shaft (25); and the second limiting member (34) is mounted on the second avoidance groove (23) by rotating.

6. The compression structure according to claim 5, wherein: A plurality of rotation grooves (24) are arranged at intervals on the upper surface of the pressing block (20) at positions corresponding to the first avoidance groove (22) and the second avoidance groove (23), and the rotation grooves (24) are connected to the first avoidance groove (22) and the second avoidance groove (23), and the rotating shaft (25) is installed in the rotation groove (24).

7. The compression structure according to claim 1, wherein: A pressure sensor is installed below the pressing block (20) for detecting the force applied to the cushion block assembly (10).

8. The compression structure according to claim 1, wherein: A lining plate (50) is installed below the cushion block assembly (10), and a plurality of hemispherical protrusions (51) are spaced apart on one side of the lining plate (50) facing the coil.

9. The compression structure according to claim 1, wherein: The invention also includes a clamp (60), wherein the clamp (60) is fixedly connected to the upper end of the pressure pin (40), wherein an adjustment hole (61) is provided on the clamp (60), and the adjustment hole (61) is arranged in parallel with 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) is rotatably matched with the rack (611) for adjusting the position of the pressure pin (40) on the clamp (60).

10. A dry-type transformer, characterized in that: The invention comprises a compression structure of a dry-type transformer as described in any one of claims 1 to 9.

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