Core structure and transformer

Abstract

The utility model discloses a kind of iron core structure and transformer, the iron core structure includes iron core body, clamping mechanism and insulation assembly, the iron core body includes multiple silicon steel sheets of laminated arrangement, the clamping mechanism includes two clamps, two the clamp respectively in the two sides of the iron core body;The insulation assembly is located between the clamp and the iron core body, the insulation assembly includes first insulating plate and insulation pad, the first insulating plate is located in the side of the iron core body, and the insulation pad one end and the first insulating plate abut, the other end and the clamp abut.The utility model technical scheme aims at reducing the deformation condition of silicon steel sheet.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a core structure and a transformer. Background Technology

[0002] The core is a key component of a transformer. It is made of stacked silicon steel sheets with a high silicon content. These sheets are clamped together by fixing components, and an insulating assembly is installed between the fixing components and the steel sheets to ensure insulation. In related technologies, the contact area between the insulating assembly and the silicon steel sheets is small, making the sheets prone to warping and deformation under the clamping force of the fixing components. This results in larger joints, increased no-load losses in the core, and noise. Utility Model Content

[0003] The main purpose of this invention is to provide a core structure that reduces deformation during the clamping of silicon steel sheets.

[0004] To achieve the above objectives, the iron core structure proposed in this utility model includes: The iron core body comprises multiple silicon steel sheets stacked together. A clamping mechanism, comprising two clamping members, which are respectively disposed on both sides of the iron core body; An insulating assembly is disposed between the clamp and the iron core body. The insulating assembly includes a first insulating plate and an insulating pad. The first insulating plate is disposed on one side of the iron core body. One end of the insulating pad abuts against the first insulating plate, and the other end abuts against the clamp.

[0005] In one embodiment of this utility model, the iron core body includes two fixing parts and multiple winding parts. The two fixing parts are respectively connected to the two ends of the winding parts. The multiple winding parts are spaced apart along the extension direction of the fixing parts. The clamping member includes clamping member webs respectively disposed on both sides of the iron core body. The clamping member webs and the first insulating plate extend along the extension direction of the fixing parts. The number of insulating pads is multiple. The multiple insulating pads are spaced apart along the extension direction of the first insulating plate.

[0006] In one embodiment of this utility model, the first insulating plate is further provided with a plurality of grooves on the side facing the iron core body, and each groove corresponds to one winding part; The insulation assembly further includes a second insulation plate, which is disposed on the surface of the iron core body and extends along the length direction of the winding portion. The end of the second insulation plate in the length direction is inserted into the groove.

[0007] In one embodiment of the present invention, the insulating pad includes a first pad and a second pad, wherein the width of the first pad is smaller than the width of the second pad, and the second pad is positioned corresponding to the groove.

[0008] In one embodiment of this utility model, the width of the second pad is not less than the width of the groove.

[0009] In one embodiment of the present invention, the two web plates of the clamp are connected by an iron core strap.

[0010] In one embodiment of the present invention, the clamping mechanism further includes a plurality of spaced screws, which are respectively connected to the web plates of the clamps located on the same side of the iron core body.

[0011] In one embodiment of this utility model, the insulating pad is fixed to the first insulating plate by adhesive.

[0012] In one embodiment of this utility model, both the first insulating board and the insulating pad are made of hot-pressed cardboard.

[0013] This utility model also provides a transformer, which includes the aforementioned core structure.

[0014] In one embodiment of this utility model, a set of clamps is provided at both ends of the iron core body to clamp and fix the iron core body, ensuring the mechanical stability of the iron core body. An insulating component is provided between the clamps and the iron core body to achieve electrical isolation and prevent short circuits, electric shocks, and arcing. The insulating component includes a first insulating plate and an insulating pad. By placing the first insulating plate on one side of the iron core body, compared to a solution where the insulating pad is in direct contact with the iron core body, the first insulating plate directly contacts the iron core body, increasing the contact area and effectively dispersing the clamping force. This avoids the problem of local deformation of the iron core body due to local stress concentration when the clamps apply clamping force. The iron core body of this application solution is less prone to warping deformation, reducing the risk of enlarged iron core body joints and helping to reduce no-load losses and operating noise. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1This is a schematic diagram of one embodiment of the iron core structure of this utility model; Figure 2 for Figure 1 Top view of the iron core structure; Figure 3 This is a top view of the first insulating plate and insulating pad of this utility model; Figure 4 This is a top view of yet another embodiment of the core structure of this utility model.

[0017] Explanation of icon numbers:

[0018] 100. Core structure; 10. Core body; 11. Fixing part; 13. Winding part; 31. Clamp; 311. Clamp web; 3111. Clamp support plate; 3111a. Connecting hole; 312. Core pull strip; 313. Screw; 50. Insulation assembly; 51. First insulation plate; 511. Groove; 52. First pad; 53. Second pad; 54. Second insulation plate; 61. Core pull plate; 63. Pull ring.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] The core is a key component of a transformer. It is made of stacked silicon steel sheets with a high silicon content. These sheets are clamped together by fixing components, and an insulating assembly is installed between the fixing components and the steel sheets to ensure insulation. In related technologies, the contact area between the insulating assembly and the silicon steel sheets is small, making the sheets prone to warping and deformation under the clamping force of the fixing components. This results in larger joints, increased no-load losses in the core, and noise.

[0025] To solve the above-mentioned technical problems, this utility model proposes an iron core structure 100.

[0026] Reference Figure 1 and Figure 3 In one embodiment of this utility model, the core structure 100 includes a core body 10, a clamping mechanism, and an insulating component 50. The clamping mechanism includes two clamps 31, which are spaced apart at both ends of the core body 10. Each clamp 31 is used to clamp the opposite sides of the core body 10. The insulating component 50 is disposed between the clamps 31 and the core body 10. The insulating component 50 includes a first insulating plate 51 and an insulating pad. The first insulating plate 51 is disposed on one side of the core body 10. One end of the insulating pad abuts against the first insulating plate 51, and the other end abuts against the clamps 31.

[0027] The core body 10 is composed of multiple thin silicon steel sheets stacked together, and the silicon steel sheets are made of silicon steel with a high silicon content. Two clamps 31 are respectively clamped at both ends of the core body 10, clamping the top and bottom ends of the core body 10 to fix the core body 10, ensuring the mechanical stability of the core body 10, reducing vibration, noise, and loss during core operation, and improving short-circuit withstand capability. Each clamp 31 includes clamp webs 311 located on both sides of the core body 10, and the two clamp webs 311 can be clamped by the engagement of nuts and bolts or screws. The first insulating plate 51 in the insulation assembly 50 can adopt a rectangular flat plate structure, and its thickness can be adjusted according to insulation requirements. The insulating pad can be cuboid or cylindrical in shape, and the materials of the first insulating plate 51 and the insulating pad can be heat-pressed cardboard, electrical cardboard, or electrical laminated wood, etc. The first insulating plate 51 and the core body 10 can be connected by adhesive or mechanical fixing. Understandably, each insulating plate can be provided with multiple insulating pads, and the multiple insulating pads are arranged at intervals along the extension direction of the first insulating plate 51.

[0028] In one embodiment of this utility model, a set of clamps 31 are respectively provided at both ends of the iron core body 10 to clamp and fix the iron core body 10, ensuring the mechanical stability of the iron core body 10. An insulating component 50 is provided between the clamps 31 and the iron core body 10 to achieve electrical isolation and prevent short circuits, electric shocks, arcs, etc. The insulating component 50 includes a first insulating plate 51 and an insulating pad. By placing the first insulating plate 51 on one side of the iron core body 10, compared with the existing solution where the insulating pad is placed on one side of the iron core body 10 in direct contact, the first insulating plate 51 in this application solution directly contacts the iron core body 10, increasing the contact area with the iron core body 10, effectively dispersing the clamping force, and avoiding the problem of local deformation of the iron core body 10 due to local stress concentration when the clamps 31 apply clamping force to the iron core body 10. The iron core body 10 of this application solution is not prone to warping deformation, reducing the risk of the iron core body 10 joints becoming larger, and helping to reduce no-load loss and operating noise.

[0029] Reference Figures 1 to 4 In one embodiment of the present invention, the core body 10 includes two fixing parts 11 and a plurality of winding parts 13. The two fixing parts 11 are respectively connected to the two ends of the winding parts 13, and the plurality of winding parts 13 are spaced apart along the extension direction of the fixing parts 11. The clamp 31 includes clamp webs 311 respectively disposed on both sides of the core body 10. The clamp webs 311 and the first insulating plate 51 are both extended along the extension direction of the fixing parts 11. The number of insulating pads is plurality of, and the plurality of insulating pads are spaced apart along the extension direction of the first insulating plate 51.

[0030] In one embodiment of the present invention, two fixing parts 11 are respectively disposed at the ends of the winding parts 13. The fixing parts 11 are used to connect multiple winding parts 13 into an integral structure. The fixing parts 11 are used to contact the clamping member 31 to withstand clamping force and transportation vibration. The winding parts 13 are used to wind the coil to withstand coil short-circuit force and axial clamping force. The number of winding parts 13 can be set according to actual needs. The clamping member web 311 can be made of metal plate, its length is slightly longer than the length of the fixing part 11, and its width is matched. The cross-section of the clamping member web 311 can be square, that is, the clamping member web 311 can be a plate; or the cross-sectional shape of the clamping member web 311 is C-shaped, that is, the side of the clamping member web 311 in the length direction is also provided with a clamping member support plate 3111, and the clamping member support plate 3111 is wider, which can provide a larger force-bearing area, thereby enhancing its load-bearing capacity, so as to facilitate the connection between the two clamping members 31 through the clamping member support plate 3111. The size of the first insulating plate 51 is larger than the contact area between the fixing part 11 and the clamping web 311, ensuring that the first insulating plate 51 can effectively isolate the clamping web 311 from the iron core body 10, thereby improving the insulation reliability between the clamping web 311 and the iron core body 10. Understandably, multiple insulating pads are spaced apart between two adjacent winding parts 13 to avoid multiple stress support points between the clamping web 311 and the iron core body 10, achieving uniform distribution of clamping force. The spaced insulating pads also ensure insulation performance and prevent stress concentration.

[0031] Reference Figure 3 and Figure 4 In one embodiment of the present invention, the first insulating plate 51 is provided with a plurality of grooves 511 on the side facing the iron core body 10, and one groove 511 corresponds to one winding part 13; the insulating assembly 50 also includes a second insulating plate 54, which is disposed on the surface of the iron core body 10 and extends along the length direction of the winding part 13, and the end of the second insulating plate 54 is inserted into the groove 511.

[0032] In one embodiment of this utility model, the size of the second insulating plate 54 is adapted to the size of the winding portion 13, effectively covering the surface of the winding portion 13 and providing more comprehensive insulation protection. The second insulating plate 54 is used to fix the last stage sheet of the iron core body 10, preventing the last stage sheet from warping and deforming after the iron core is erected. The groove 511 provided on the first insulating plate 51 facilitates the insertion and fixing of the second insulating plate 54. The depth and width of the groove 511 can be adjusted according to the size of the second insulating plate 54 to ensure that the second insulating plate 54 can be firmly inserted. The shape of the groove 511 can be rectangular, trapezoidal, or other suitable shapes, as long as it can accommodate the end of the second insulating plate 54. The thickness of the second insulating plate 54 can match the depth of the groove 511 to achieve a tight fit. The material of the second insulating plate 54 can be the same hot-pressed paperboard as the first insulating plate 51 to ensure the consistency of insulation performance. By providing grooves 511 on the first insulating plate 51, it is easier to insert the ends of the second insulating plate 54 along its length into the grooves 511, increasing the reliability of the second insulating plate 54's fixation and ensuring the insulation effect and structural stability of the insulating assembly 50. Furthermore, the grooves 511 allow the second insulating plate 54 to be better fixed to the iron core body 10, preventing displacement or deformation under clamping force. Understandably, the insertion of the two ends of the second insulating plate 54 along its length into the grooves 511 on the first insulating plate 51 in the two clamps 31 further enhances the reliability of the second insulating plate 54's fixation. (Refer to...) Figure 3 and Figure 4 In one embodiment of the present invention, the insulating pad includes a first pad 52 and a second pad 53. The width of the first pad 52 is smaller than the width of the second pad 53, and the second pad 53 is positioned corresponding to the groove 511.

[0033] In one embodiment of the present invention, the width of the first pad 52 is smaller than that of the second pad 53, creating a width difference in their structure. The second pad 53 is configured to align with the groove 511 area corresponding to the winding portion 13. By setting the width of the second pad 53 to be wider, it ensures that the force-bearing area of ​​the first insulating plate 51 corresponding to the groove 511 is larger, preventing deformation of the first insulating plate 51 corresponding to the groove 511 due to a small force-bearing area, thereby improving the reliability of the insulating assembly 50. Simultaneously, the width of the first pad 52 is smaller than that of the second pad 53, allowing for a larger number of first pads 52, resulting in more force-bearing points between the first pads 52 and the first insulating plate 51, thus improving the uniformity of force distribution. It should be noted that the number of second pads 53 is the same as the number of grooves 511, that is, the number of second pads 53 is the same as the number of winding portions 13.

[0034] Reference Figure 3 and Figure 4In one embodiment of this utility model, the width of the second pad 53 is not less than the width of the groove 511. In this embodiment, the width of the second pad 53 not being less than the width of the groove 511 can be understood as the second pad 53 completely covering the opening of the groove 511 in the lateral dimension, or being slightly larger than the opening size of the groove 511. This allows the second pad 53 to completely cover the area of ​​the groove 511, thereby increasing the force-bearing area between the second pad 53 and the first insulating plate 51, achieving effective support for the first insulating plate 51. When the clamping member 31 applies clamping force, the wider second pad 53 can evenly distribute the pressure, avoiding stress concentration that could cause deformation of the first insulating plate 51. Simultaneously, the complete coverage of the groove 511 area by the second pad 53 can prevent local warping of the winding portion 13 under pressure, thereby maintaining the flatness of the silicon steel sheet stack.

[0035] In one embodiment of this utility model, both the first insulating plate 51 and the insulating pad are made of hot-pressed paperboard. Hot-pressed paperboard is a composite material formed by laminating and curing multiple layers of impregnated insulating paper under high temperature and high pressure. The hot-pressed paperboard can be made of phenolic resin impregnated kraft paper, hot-pressed at a temperature range of 120-180℃ and a pressure of 5-10MPa. The thickness of the first insulating plate 51 can be between 1mm and 3mm, and the thickness of the insulating pad can be adjusted to between 3mm and 8mm depending on the gap between the clamp 31 and the iron core body 10. The hot-pressed paperboard has uniform insulation properties and mechanical strength; when fixed with adhesive, the molecular chains at its interface can interpenetrate to enhance the bonding strength.

[0036] In one embodiment of this invention, the insulating pad and the first insulating plate 51 are fixed together by adhesive. The adhesive can be an epoxy resin, acrylic adhesive, or silicone rubber, which possesses good insulation properties and mechanical strength. Before curing, the adhesive is fluid, capable of filling microscopic unevenness in the contact surface between the insulating pad and the first insulating plate 51, thereby increasing the contact area and bonding reliability. For example, a thermosetting adhesive can be used, which is heated to 80-120°C to allow it to fully flow and cure. By using adhesive fixing, a rigid connection is formed between the insulating pad and the first insulating plate 51, effectively preventing relative displacement under clamping force. The adhesive layer not only provides fixation but also buffers localized stress, preventing damage to the insulating pad due to concentrated stress.

[0037] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the two clamp webs 311 of the clamp 31 are connected by an iron core pull strap 312.

[0038] In one embodiment of the present invention, the web plate 311 of the clamping member is provided with fixing holes, and the iron core pull strap 312 passes through the fixing holes of the two clamping member web plates 311 and is locked in place. The fixing holes can be configured as through holes or threaded holes, with a diameter that allows the iron core pull strap 312 to pass through easily. After the iron core pull strap 312 passes through the two clamping member web plates 311, an axial clamping force is applied by the locking member, so that the clamping member web plates 311 generate a uniform clamping force. Through the mechanical locking method of the iron core pull strap 312 nut, the clamping member web plate 311 is stably fixed to the iron core body 10. At the same time, the clamping force can be precisely controlled by adjusting the locking torque of the locking member. The rigid connection of the iron core pull strap nut ensures that the clamping member 31 does not shift during transformer operation, and provides a reliable and adjustable mechanical fixing solution. Furthermore, a shim can be added to the outside of the clamping member web plate 311 to disperse the locking stress, or a double nut structure can be used to prevent loosening.

[0039] In one embodiment of this utility model, the two clamping webs 311 of the clamping member 31 are also connected by a core pull plate 61. Specifically, pull rings 63 are spaced apart along the length direction of the clamping webs 311, and two opposite pull rings 63 are fixedly connected by a core pull plate 61, thereby fixing the two clamping webs 311 together and further improving the reliability of the core fixing.

[0040] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the clamping mechanism further includes a plurality of spaced screws 313, which are respectively connected to the web plates 311 of the two clamps 31 located on the same side of the iron core body 10.

[0041] In one embodiment of the present invention, the screw 313 includes a nut and a tie bolt or tie rod. A clamping support plate 3111 is provided on the side of the clamping web 311 along its length. The clamping support plate 3111 and the clamping web 311 are integrally formed. A connecting hole 3111a is provided on the clamping support plate 3111. The tie bolt or tie rod passes through the connecting hole 3111a and is locked with the nut, thus connecting the upper and lower clamping members 31. It can be understood that multiple screws 313 are spaced apart, and these multiple screws 313 are spaced apart along the length of the clamping web 311 to ensure uniform force distribution on the connection between the two clamping members 31, improving stability. The screws 313 fix the clamping members 31 into a whole, enabling the entire iron core structure to be hoisted.

[0042] This utility model also proposes a transformer, which includes a housing and a core structure 100. The specific structure of the core structure 100 is as described in the above embodiments. Since this transformer adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The core structure 100 is disposed inside the housing, which contains transformer oil, and the core structure 100 is immersed in the transformer oil.

[0043] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An iron core structure, characterized by, include: The iron core body comprises multiple silicon steel sheets stacked together. A clamping mechanism, comprising two clamping members, which are respectively disposed on both sides of the iron core body; An insulating assembly is disposed between the clamp and the iron core body. The insulating assembly includes a first insulating plate and an insulating pad. The first insulating plate is disposed on one side of the iron core body. One end of the insulating pad abuts against the first insulating plate, and the other end abuts against the clamp.

2. The core structure of claim 1, wherein The iron core body includes two fixed parts and multiple winding parts. The two fixed parts are respectively connected to the two ends of the winding parts, and the multiple winding parts are spaced apart along the extension direction of the fixed parts. The clamping member includes clamping webs respectively disposed on both sides of the iron core body. The clamping webs and the first insulating plate extend along the extension direction of the fixing part. There are multiple insulating pads, and the multiple insulating pads are spaced apart along the extension direction of the first insulating plate.

3. The core structure of claim 2, wherein The first insulating plate is also provided with a plurality of grooves on the side facing the iron core body, and each groove corresponds to one winding part; The insulation assembly further includes a second insulation plate, which is disposed on the surface of the iron core body and extends along the length direction of the winding portion. The end of the second insulation plate in the length direction is inserted into the groove.

4. The core structure of claim 3, wherein The insulating pad includes a first pad and a second pad, wherein the width of the first pad is smaller than the width of the second pad, and the second pad is positioned corresponding to the groove.

5. The core structure of claim 4, wherein The width of the second pad is not less than the width of the groove.

6. The core structure of claim 2, wherein The two webs of the clamp are connected by an iron core strap.

7. The core structure of claim 2, wherein The clamping mechanism also includes a plurality of spaced screws, which are respectively connected to the web of the clamping member located on the same side of the iron core body.

8. The core structure of any one of claims 1 to 7, wherein The insulating pad is fixed to the first insulating plate by adhesive.

9. The core structure as described in claim 8, characterized in that, Both the first insulating board and the insulating pad are made of heat-pressed cardboard.

10. A transformer, characterized by Includes the core structure as described in any one of claims 1 to 9.

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