Magnetic leakage shielding structure of transformer
By setting up a multi-layer magnetic shielding structure on the inner wall and winding end of the transformer box, and using components such as magnetically conductive shielding plates and slide chutes, the problems of insufficient magnetic leakage shielding and heat dissipation in the prior art are solved, and the leakage of transformer is achieved The effective shielding of magnetism and the maintenance of heat dissipation channels improve the operating performance of the transformer.
Patent Information
- Application Number
- CN202420955397.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-06
AI Technical Summary
The existing transformer magnetic leakage shielding structure cannot fully shield magnetic leakage, affecting the operating performance of the transformer, and forming a closed structure around the winding, hindering heat dissipation.
A transformer leakage magnetic shielding structure is designed. By providing a first magnetic shield, a second magnetic shield and a third magnetic shield on the inner wall of the transformer box, and an end magnetic shield is provided at the end of the winding, and a magnetic shield is used to utilize a magnetic shielding plate and a sliding plate. Components such as slots and guide rods realize effective shielding of magnetic leakage and maintenance of heat dissipation channels.
It effectively reduces the eddy current loss and local overheating of the transformer winding, adapts to the magnetic shielding of windings of different specifications, and maintains the heat dissipation channel of the windings to ensure the stable operation of the transformer.
Smart Images
Figure CN222213917U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of transformer magnetic shielding and relates to a transformer leakage magnetic shielding structure. Background Art
[0002] The current in the transformer windings and leads will generate leakage magnetic flux, which will cause additional losses in the transformer, resulting in eddy current losses and local overheating of the transformer, thereby affecting the operating performance of the transformer.
[0003] In order to ensure the safe and stable operation of the transformer, it is necessary to shield the leakage magnetic flux generated by the transformer. The magnetic shielding of the transformer is installed inside the transformer through a shielding body such as a shell, box, or plate made of magnetic conductive metal, which weakens and shields the leakage magnetic flux.
[0004] The existing transformer leakage magnetic shielding structure is usually set on the transformer box wall and the outer periphery of the winding, which cannot fully shield the leakage magnetic flux. At the same time, the existing transformer leakage magnetic shielding structure forms a relatively closed structure around the winding, which also affects the heat dissipation of the winding to a certain extent.
[0005] Therefore, in view of the above-mentioned defects of the existing transformer leakage magnetic shielding structure, the utility model discloses a transformer leakage magnetic shielding structure. Utility Model Content
[0006] The utility model aims to provide a transformer leakage magnetic shielding structure, which can perform leakage magnetic shielding for windings of different specifications and reserve sufficient heat dissipation gap around the windings, so as to ensure the leakage magnetic shielding effect of the transformer without affecting the heat dissipation of the internal windings of the transformer.
[0007] The utility model is realized by the following technical solutions:
[0008] A transformer magnetic leakage shielding structure comprises a transformer box and a transformer winding, wherein a first magnetic shield and a second magnetic shield are respectively arranged on the inner wall of the transformer box corresponding to the two ends of the transformer winding, and a third magnetic shield is connected between the first magnetic shield and the second magnetic shield; shielding frames are respectively arranged at the two ends of the transformer winding, and an end magnetic shield is movably arranged on a side of the shielding frame close to the transformer winding, and the end magnetic shield comprises a plurality of magnetic conductive shielding plates stacked and arranged at intervals.
[0009] By setting the end magnetic shields at the upper and lower ends of the transformer winding, the magnetic leakage of the transformer winding itself can be changed, and the magnetic leakage of the ends of the transformer winding in the horizontal and vertical directions can be shielded and reduced, thereby reducing the eddy current loss caused by the magnetic leakage of the transformer winding as a whole. The magnetic leakage outside the transformer winding can also be guided and collected by the end magnetic shielding, so that the external leakage magnetic flux enters the iron core of the transformer winding, thereby reducing the leakage magnetic flux entering the supporting connection structure such as the clamps inside the transformer, and effectively avoiding local overheating of the remaining supporting connection structures inside the transformer. At the same time, by moving the installation position of the end magnetic shield on the shielding frame, the position of the end magnetic shield relative to the end of the transformer winding can be adjusted to adapt to different transformer windings for effective magnetic shielding.
[0010] The first magnetic shield, the second magnetic shield and the third magnetic shield arranged on the inner wall of the transformer box are used to shield the leakage magnetic flux from directly entering the box wall of the transformer box, reduce the eddy current loss in the box wall of the transformer box, and avoid local overheating of the box wall.
[0011] In order to better realize the utility model, further, a slide groove is provided on the side of the shielding frame close to the transformer winding, a shielding plate mounting frame is slidably installed in the slide groove, and a plurality of magnetic shielding plates are spaced and clamped on the shielding plate mounting frame in a direction toward the transformer winding.
[0012] In order to better implement the utility model, further, two groups of guide rods extending toward the transformer winding are arranged side by side on one side of the shielding plate mounting frame, a plurality of slots are arranged on the two groups of guide rods, and a magnetic shielding plate is clamped between the corresponding slots on the two groups of guide rods.
[0013] In order to better realize the utility model, further, the magnetic shielding plate includes a first silicon steel sheet, a second silicon steel sheet, and a copper sheet. The copper sheet is arranged between the first silicon steel sheet and the second silicon steel sheet. A first gap is arranged between the copper sheet and the first silicon steel sheet, and a second gap is arranged between the copper sheet and the second silicon steel sheet.
[0014] In order to better implement the present invention, further, both ends of the first silicon steel sheet are bent toward a direction close to the first gap, and both ends of the second silicon steel sheet are bent toward a direction close to the second gap.
[0015] In order to better implement the present invention, further, the first gap and the second gap are filled with epoxy resin.
[0016] In order to better implement the present invention, further, a first card slot is provided at one end of the first magnetic shield close to the second magnetic shield, a second card slot is provided at one end of the second magnetic shield close to the first magnetic shield, and two ends of the third magnetic shield are respectively connected to the first card slot and the second card slot.
[0017] In order to better implement the present invention, further, a first insulating member is provided between the first magnetic shield and the inner wall of the transformer box, and a second insulating member is provided between the second magnetic shield and the inner wall of the transformer box.
[0018] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0019] The utility model provides a detachably snap-connected first magnetic shield, a second magnetic shield, and a third magnetic shield on the inner wall of the transformer box body, thereby shielding the leakage magnetic flux entering the transformer box wall and avoiding local overheating of the box wall; provides an end magnetic shield at the end of the transformer winding, changes the leakage magnetic flux of the transformer winding itself through the end magnetic shield, can shield and reduce the leakage magnetic flux of the transformer winding end in the horizontal and vertical directions, thereby reducing the eddy current loss caused by the leakage magnetic flux of the transformer winding as a whole; at the same time, by adjusting the relative position of the end magnetic shield with respect to the transformer winding and reserving a sufficient gap, the transformer leakage magnetic shielding structure can adapt to transformer windings of different specifications for effective magnetic shielding without affecting the heat dissipation of the transformer winding. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the transformer leakage magnetic shielding structure;
[0021] Figure 2 for Figure 1 AA section view;
[0022] Figure 3 for Figure 1 BB section view;
[0023] Figure 4 This is a schematic diagram of the installation of a magnetic shielding plate;
[0024] Figure 5 It is a structural schematic diagram of a magnetic shielding plate;
[0025] Figure 6 This is a schematic diagram of the installation of the third magnetic shield.
[0026] Among them: 1-transformer box; 2-transformer winding; 3-shielding frame; 4-shielding plate mounting frame; 31-slide slot; 41-guide rod; 42-slot; 100-first magnetic shield; 200-second magnetic shield; 300-third magnetic shield; 400-end magnetic shield; 401-magnetic shielding plate; 001-first silicon steel sheet; 002-second silicon steel sheet; 003-copper sheet. DETAILED DESCRIPTION
[0027] The following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.
[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the utility model explicitly states otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0029] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.
[0030] Terminology explanation section: The terms "install", "connect", "connect", "fixed" and so on in the present utility model should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.
[0031] Embodiment 1:
[0032] A transformer leakage magnetic shielding structure of this embodiment, such as Figure 1-Figure 3 As shown, it includes a transformer box 1 and a transformer winding 2, and a first magnetic shield 100 and a second magnetic shield 200 are respectively arranged on the inner wall of the transformer box 1 corresponding to the two ends of the transformer winding 2, and a third magnetic shield 300 is connected between the first magnetic shield 100 and the second magnetic shield 200; a shielding frame 3 is respectively arranged at the two ends of the transformer winding 2, and an end magnetic shield 400 is movably arranged on the side of the shielding frame 3 close to the transformer winding 2, and the end magnetic shield 400 includes a plurality of magnetic conductive shielding plates 401 stacked and arranged at intervals.
[0033] The upper and lower ends of the transformer winding 2 are symmetrically provided with end magnetic shields 400, which are composed of a number of magnetic shielding plates 401 stacked at intervals. There are gaps between adjacent magnetic shielding plates 401, which ensure that the end magnetic shielding 400 can shield the leakage magnetic flux of the transformer winding 2, and at the same time, the gaps between the magnetic shielding plates 401 ensure that the transformer winding 2 has sufficient heat dissipation channels. The end magnetic shielding 400 can change the leakage magnetic flux of the transformer winding 2 itself, and can shield and reduce the leakage magnetic flux at the end of the transformer winding 2 in the horizontal and vertical directions, thereby reducing the eddy current loss caused by the leakage magnetic flux of the transformer winding 2 as a whole, and effectively avoiding the occurrence of local heating of the transformer winding 2. At the same time, the end magnetic shielding 400 can guide and converge the leakage magnetic flux from the outside of the transformer winding 2, so as to guide and converge the external leakage magnetic flux through the iron core of the transformer winding 2, thereby reducing the leakage magnetic flux entering other supporting connection structures inside the transformer. Furthermore, by moving the installation position of the end magnetic shield 400 on the shield frame 3, the position of the end magnetic shield 400 relative to the end of the transformer winding 2 can be adjusted, thereby adapting to the ends of the transformer winding 2 of different specifications to achieve effective magnetic shielding.
[0034] The first magnetic shield 100, the second magnetic shield 200, and the third magnetic shield 300 are arranged on the front, rear, left, and right inner walls of the transformer box 1. The first magnetic shield 100, the second magnetic shield 200, and the third magnetic shield 300 are used to reduce the leakage magnetic flux entering the box wall, thereby avoiding the situation where the box wall is locally overheated. At the same time, the third magnetic shield 300 is detachably mounted between the first magnetic shield 100 and the second magnetic shield 200. When it is necessary to inspect and maintain the inside of the transformer, the transformer box 1 is opened, and then the third magnetic shield 300 is disassembled, so that the inside of the transformer can be conveniently maintained.
[0035] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.
[0036] Embodiment 2:
[0037] A transformer leakage magnetic shielding structure is improved on the basis of embodiment 1, such as Figure 4 As shown, a slide groove 31 is provided on one side of the shielding frame 3 close to the transformer winding 2, a shielding plate mounting frame 4 is slidably mounted in the slide groove 31, and a plurality of magnetic shielding plates 401 are intermittently mounted on the shielding plate mounting frame 4 in a direction toward the transformer winding 2. Two groups of guide rods 41 extending toward the transformer winding 2 are arranged side by side on one side of the shielding plate mounting frame 4, a plurality of slots 42 are arranged on the two groups of guide rods 41, and a magnetic shielding plate 401 is mounted between the corresponding slots 42 on the two groups of guide rods 41.
[0038] The guide rod 41 is connected with the slide slot 31 in a sliding manner, and a locking nut is sleeved on the external thread of one end of the guide rod 41. The guide rod 41 can be slid along the slide slot 31 by loosening the locking nut, thereby adjusting the position of the magnetic shielding plate 401 relative to the end of the transformer winding 2. Then, the locking nut is tightened so that the locking nut tightens the guide rod 41 to fix the magnetic shielding plate 401.
[0039] The guide rod 41 is provided with a plurality of annular slots 42 arranged linearly, and the magnetic shielding plate 401 is provided with a corresponding through slot. One end of the through slot is provided with an opening that cooperates with the slot 42 to achieve the connection between the magnetic shielding plate 401 and the guide rod 41.
[0040] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.
[0041] Embodiment 3:
[0042] A transformer leakage magnetic shielding structure is improved on the basis of embodiment 1 or 2, such as Figure 5 As shown, the magnetic shielding plate 401 includes a first silicon steel sheet 001, a second silicon steel sheet 002, and a copper sheet 003. The copper sheet 003 is arranged between the first silicon steel sheet 001 and the second silicon steel sheet 002. A first gap is arranged between the copper sheet 003 and the first silicon steel sheet 001, and a second gap is arranged between the copper sheet 003 and the second silicon steel sheet 002.
[0043] By setting the first gap and the second gap, it is ensured that the magnetic shielding plate 401 itself has sufficient heat dissipation gap, and the copper sheet 003 is selected from T2M copper sheet to ensure excellent magnetic shielding effect.
[0044] Furthermore, both ends of the first silicon steel sheet 001 are bent toward the direction close to the first gap, and both ends of the second silicon steel sheet 002 are bent toward the direction close to the second gap, so as to improve the magnetic shielding effect of the copper sheet 003 .
[0045] Furthermore, the first gap and the second gap are filled with epoxy resin, and the copper sheet 003 is supported by the epoxy resin to ensure the stability of the copper sheet 003.
[0046] The other parts of this embodiment are the same as those of Embodiment 1 or 2, and thus will not be described in detail.
[0047] Embodiment 4:
[0048] A transformer leakage magnetic shielding structure is improved on the basis of any one of embodiments 1-3, such as Figure 6 As shown, a first slot is provided at one end of the first magnetic shield 100 close to the second magnetic shield 200, a second slot is provided at one end of the second magnetic shield 200 close to the first magnetic shield 100, and two ends of the third magnetic shield 300 are respectively connected to the first slot and the second slot.
[0049] Both ends of the third magnetic shield 300 are provided with clamping blocks, and the clamping blocks at both ends of the third magnetic shield 300 are respectively clamped with the first clamping slot and the second clamping slot, so as to realize the detachable clamping of the third magnetic shield 300 between the first magnetic shield 100 and the second magnetic shield 200. When it is necessary to inspect and maintain the inside of the transformer, the door on the transformer box 1 is opened, and then the third magnetic shield 300 is removed from between the first magnetic shield 100 and the second magnetic shield 200, so that sufficient inspection and maintenance space can be reserved for the staff to perform maintenance and repair on the inside of the transformer.
[0050] Furthermore, a first insulating member is arranged between the first magnetic shield 100 and the inner wall of the transformer box 1, and a second insulating member is arranged between the second magnetic shield 200 and the inner wall of the transformer box 1. By arranging the first insulating member and the second insulating member, the insulation between the first magnetic shield 100, the second magnetic shield 200 and the transformer box 1 can be ensured, thereby ensuring the safety of the transformer.
[0051] Furthermore, the first insulating member and the second insulating member are made of temperature-resistant rubber.
[0052] The other parts of this embodiment are the same as any one of Embodiments 1-3, so they are not described again.
[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.
Claims
1. A transformer magnetic leakage shielding structure, comprising a transformer box (1) and a transformer winding (2), characterized in that: A first magnetic shield (100) and a second magnetic shield (200) are respectively arranged on the inner wall of the transformer box (1) at the two ends corresponding to the transformer winding (2), and a third magnetic shield (300) is connected between the first magnetic shield (100) and the second magnetic shield (200); a shielding frame (3) is respectively arranged at the two ends of the transformer winding (2), and an end magnetic shield (400) is movably arranged on a side of the shielding frame (3) close to the transformer winding (2), and the end magnetic shield (400) comprises a plurality of magnetic conductive shielding plates (401) stacked and arranged at intervals.
2. A transformer magnetic leakage shielding structure according to claim 1, characterized in that: A slide groove (31) is provided on a side of the shielding frame (3) close to the transformer winding (2), a shielding plate mounting frame (4) is slidably mounted in the slide groove (31), and a plurality of magnetic shielding plates (401) are spaced and mounted on the upper edge of the shielding plate mounting frame (4) in a direction toward the transformer winding (2).
3. A transformer leakage magnetic shielding structure according to claim 2, characterized in that: Two groups of guide rods (41) extending toward the transformer winding (2) are arranged side by side on one side of the shielding plate mounting frame (4); a plurality of slots (42) are arranged in an array on the two groups of guide rods (41); and a magnetic shielding plate (401) is mounted between corresponding slots (42) on the two groups of guide rods (41).
4. A transformer leakage magnetic shielding structure according to claim 3, characterized in that: The magnetic shielding plate (401) comprises a first silicon steel sheet (001), a second silicon steel sheet (002), and a copper sheet (003); the copper sheet (003) is arranged between the first silicon steel sheet (001) and the second silicon steel sheet (002); a first gap is arranged between the copper sheet (003) and the first silicon steel sheet (001); and a second gap is arranged between the copper sheet (003) and the second silicon steel sheet (002).
5. A transformer magnetic leakage shielding structure according to claim 4, characterized in that: Both ends of the first silicon steel sheet (001) are bent in a direction close to the first gap, and both ends of the second silicon steel sheet (002) are bent in a direction close to the second gap.
6. The transformer magnetic flux leakage shielding structure according to claim 5, characterized in that: The first gap and the second gap are filled with epoxy resin.
7. A transformer magnetic flux leakage shielding structure according to any one of claims 1 to 6, characterized in that: A first slot is provided at one end of the first magnetic shield (100) close to the second magnetic shield (200), a second slot is provided at one end of the second magnetic shield (200) close to the first magnetic shield (100), and two ends of the third magnetic shield (300) are respectively correspondingly connected to the first slot and the second slot.
8. The transformer magnetic flux leakage shielding structure according to claim 7, characterized in that: A first insulating member is provided between the first magnetic shield (100) and the inner wall of the transformer box (1), and a second insulating member is provided between the second magnetic shield (200) and the inner wall of the transformer box (1).