A core pull provided with a magnetic circuit optimization structure

Abstract

The utility model relates to transformer technical field especially relates to a core pull belt of installing magnetic circuit optimization structure. Including pull belt, silicon steel sheet and steel clamping piece, silicon steel sheet is located pull belt's both sides vertical close arrangement, and steel clamping piece is used for fixing the same side adjacent silicon steel sheet, and pull belt and silicon steel sheet form a whole through steel clamping piece, and the inside of pull belt both ends is all provided with bolt hole. The core pull belt of installing magnetic circuit optimization structure provided by the utility model arranges silicon steel sheet in the both sides of pull belt, and according to the reluctance of silicon steel sheet is less than the reluctance of pull belt, so the magnetic force line mainly will flow through silicon steel sheet, reduces the magnetic flux density of pull belt, thereby reduces the pull belt hotspot temperature.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a core pull belt with an optimized magnetic circuit structure. Background Technology

[0002] Under normal operating conditions, the transformer core may loosen and deform due to electromagnetic and mechanical forces. Core tie strips can be used to fix the core, preventing displacement or deformation during operation due to electromagnetic forces and mechanical vibrations. The tie strips also constrain core deformation and reduce vibration noise. When high-voltage, high-capacity transformers are used, leakage flux is generated inside the transformer tank. If the hot spot temperature at the core tie strip reaches 600℃, it will affect the normal operation of the transformer.

[0003] When the hot spot temperature reaches 600℃, this severely excessive temperature will damage the insulation of the core pull strip and cause aging of the surrounding insulating oil. With continued high temperatures, the surrounding insulating oil will vaporize, producing a mixture of hydrocarbon gases, which may trigger alarms or even malfunctions of the light gas protection device. Therefore, to address the problem of excessive hot spot temperature in the transformer core pull strip, a new type of core pull strip with an optimized magnetic circuit structure needs to be constructed. Utility Model Content

[0004] Therefore, it is necessary to provide a core pull belt with an optimized magnetic circuit structure to address the aforementioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A core pull strip with a magnetic circuit optimization structure includes a pull strip, silicon steel sheets, and steel clips. The silicon steel sheets are arranged vertically and tightly on both sides of the pull strip, and the steel clips are used to fix adjacent silicon steel sheets on the same side. The pull strip and the silicon steel sheets are integrated by the steel clips.

[0007] As a preferred embodiment of the core pull belt with magnetic circuit optimization structure provided by this utility model, bolt holes are provided inside both ends of the pull belt.

[0008] In a preferred embodiment of the core pull strip with magnetic circuit optimization structure provided by this utility model, the steel clip has a U-shaped structure.

[0009] As a preferred embodiment of the iron core pull belt with magnetic circuit optimization structure provided by this utility model, it also includes a support structure. The support structure includes a first support shell, a second support shell, and an adjustment platform. The first support shell is located at one end of the second support shell, and the adjustment platform is slidably connected to the inside of the top of both the first support shell and the second support shell.

[0010] As a preferred embodiment of the core pull belt with magnetic circuit optimization structure provided by this utility model, the top of the adjustment platform is provided with evenly distributed connecting holes.

[0011] In a preferred embodiment of the core pull belt with magnetic circuit optimization structure provided by this utility model, the tops of both sides of the first support shell and the second support shell are threaded with positioning bolts, and the positioning bolts are slidably connected to the adjustment table.

[0012] As a preferred embodiment of the core pull belt with magnetic circuit optimization structure provided by this utility model, limit holes are evenly distributed inside both sides of the adjustment platform, and the positioning bolts are slidably connected to the limit holes.

[0013] In a preferred embodiment of the core pull belt with magnetic circuit optimization structure provided by this utility model, an adjustment component for adjusting the spacing is assembled between the first support shell and the second support shell. The adjustment component includes a rotating rod, a rotating block, a threaded sleeve, a guide post, and a guide sleeve. The end of the rotating rod away from the second support shell passes through the first support shell, and the rotating rod is rotatably connected to the first support shell through a bearing. A threaded sleeve is threadedly connected to the outer side of the rotating rod near the second support shell, and the threaded sleeve is fixed to the second support shell. Guide posts are fixed on both sides of the rotating rod at the end of the first support shell near the second support shell. Guide sleeves are fixed on the end of the second support shell near the first support shell at positions corresponding to the guide posts. The guide posts and guide sleeves are slidably connected.

[0014] It is clear without a doubt that the technical solution described above in this application can solve the technical problem that this application aims to address.

[0015] At the same time, through the above technical solutions, this utility model has at least the following beneficial effects:

[0016] The present invention provides a core pull strip with a magnetic circuit optimization structure. By arranging silicon steel sheets on both sides of the pull strip, and since the magnetic resistance of the silicon steel sheets is smaller than that of the pull strip, the magnetic lines of force mainly flow through the silicon steel sheets, thereby reducing the magnetic flux density of the pull strip and thus reducing the hot spot temperature of the pull strip.

[0017] By cooperating with the first support shell, the second support shell, and the adjusting platform, the pull belt can be assembled between the two adjusting platforms. The height of the adjusting platform at the top of the first or second support shell can be adjusted as needed to adjust the height of the pull belt. At the same time, the distance between the first and second support shells can be adjusted according to the rotation of the rotating rod. Thus, the distance between the two adjusting platforms and the height of the adjusting platforms can be adjusted according to the assembly position of the pull belt. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0020] Figure 2 This is a side view of the overall structure of Embodiment 1 of this utility model;

[0021] Figure 3 This is a top view of the overall structure of Embodiment 1 of this utility model;

[0022] Figure 4 This is a schematic diagram of the overall structure of Embodiment 3 of this utility model;

[0023] Figure 5 This is a structural separation diagram of Embodiment 3 of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the adjustment table of this utility model.

[0025] In the diagram: 1. Strap; 2. Silicon steel sheet; 3. Steel clamp; 4. Bolt hole; 5. First support shell; 6. Second support shell; 7. Rotating rod; 8. Rotating block; 9. Threaded sleeve; 10. Guide post; 11. Guide sleeve; 12. Adjusting platform; 13. Connecting hole; 14. Limiting hole; 15. Positioning bolt. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0028] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] Example 1

[0031] Reference Figures 1-3 A core pull belt with a magnetic circuit optimization structure includes a pull belt 1, silicon steel sheets 2, and steel clips 3. The silicon steel sheets 2 are arranged vertically and tightly on both sides of the pull belt 1, thereby greatly solving the problem of excessive hot spot temperature of the core pull belt by installing silicon steel sheets 2 on both sides of the pull belt 1. The steel clips 3 are used to fix adjacent silicon steel sheets 2 on the same side, and the pull belt 1 and silicon steel sheets 2 are connected into a whole by the steel clips 3. Bolt holes 4 are opened in the interior of both ends of the pull belt 1, so that the pull belt 1 is connected and fixed to the clamp through the bolt holes 4.

[0032] In this embodiment, 20 silicon steel sheets 2 of 0.30mm are installed on each side of the pull belt 1 to guide the direction of leakage magnetic flux on the pull belt 1, thereby reducing the magnetic flux density of the pull belt 1. Therefore, the problem of excessively high hot spot temperature caused by leakage magnetic flux in the pull belt 1 can be solved to a great extent.

[0033] Preferably, the steel clips 3 have a U-shaped structure and are evenly distributed and fixed on both sides of the pull strap 1 by welding, which is used to fix the silicon steel sheet 2 in the area between two adjacent steel clips 3 on the same side;

[0034] Preferably, the silicon steel sheets 2 are arranged vertically and closely within the area of ​​the pull belt 1 and the steel clip 3.

[0035] The process of using the core pull belt with the optimized magnetic circuit structure of this utility model is as follows:

[0036] Silicon steel sheets 2 are arranged parallel to the sides of the pull belt 1 on both sides. Adjacent silicon steel sheets 2 are bonded together with resin. Steel clips 3 are welded to the belly and near end of the pull belt 1 to fix the silicon steel sheets 2. Installing silicon steel sheets 2 on the pull belt 1 structure can guide the magnetic flux flow on the pull belt 1, thereby reducing eddy current loss at the pull belt 1 and reducing the hot spot temperature at the pull belt 1.

[0037] Example 2

[0038] Based on the above embodiment one, its calculation method is disclosed.

[0039] By placing silicon steel sheets on both sides of the pull belt to guide the magnetic flux, the hot spot temperature of the pull belt is reduced.

[0040]

[0041] In the formula: R is the magnetic reluctance, L is the magnetic path length, μ is the magnetic permeability, and S is the cross-sectional area of ​​the magnetic path. When the magnetic path length L is taken as a fixed value, since the magnetic permeability of the pull belt 1 is smaller than that of the silicon steel sheet 2, the magnetic reluctance of the pull belt 1 is larger than that of the silicon steel sheet 2, i.e., R 拉带 >R硅钢片 Therefore, with the introduction of silicon steel sheet 2, most of the magnetic flux will use silicon steel sheet 2 as the channel, thereby significantly reducing the eddy current loss on the pull belt 1.

[0042] Formula for calculating eddy current loss:

[0043]

[0044] In the formula: P e For eddy current loss, k is a constant coefficient, B is magnetic flux density, f is frequency, a is the thickness of the tape, V is the volume of the tape, and ρ is resistivity.

[0045] Example 3

[0046] Reference Figures 4-6 A core pull belt with a magnetic circuit optimization structure is also included, which includes a support structure. The support structure includes a first support shell 5, a second support shell 6 and an adjustment platform 12. The first support shell 5 is located at one end of the second support shell 6. The adjustment platform 12 is slidably connected to the inside of the top of the first support shell 5 and the second support shell 6, so that the height of the adjustment platform 12 at the top of the corresponding first support shell 5 or second support shell 6 can be adjusted. The top of the adjustment platform 12 is evenly provided with connecting holes 13, so that bolts can be connected to the pull belt 1 through bolt holes 4. The bolts selected at this time are insulated bolts.

[0047] In this embodiment, the bottoms of the first support shell 5 and the second support shell 6 can be fixed to the external transformer by welding, by adhesive bonding, or by bolt connection.

[0048] The top of both sides of the first support shell 5 and the second support shell 6 are threaded with positioning bolts 15. The positioning bolts 15 are slidably connected to the adjusting platform 12, so that after the adjusting platform 12 is slidably adjusted on the top of the corresponding first support shell 5 or second support shell 6, the positioning bolts 15 rotate into the interior of the adjusting platform 12, thus restricting the adjusting platform 12 from further adjusting its height on the top of the first support shell 5 or second support shell 6. Limiting holes 14 are evenly distributed inside both sides of the adjusting platform 12. The positioning bolts 15 are slidably connected to the limiting holes 14, thus allowing the positioning bolts 15 to slide into the interior of the adjusting platform 12 through the limiting holes 14.

[0049] An adjustment assembly for adjusting the distance is assembled between the first support shell 5 and the second support shell 6. The adjustment assembly includes a rotating rod 7, a rotating block 8, a threaded sleeve 9, a guide post 10, and a guide sleeve 11. The end of the rotating rod 7 away from the second support shell 6 passes through the first support shell 5. A bearing is provided inside the first support shell 5 and is rotatably connected to the rotating rod 7 through the bearing. The rotating block 8 is fixed to the end of the rotating rod 7 away from the second support shell 6 and abuts against the outer wall of the first support shell. The threaded sleeve 9 is threadedly connected to the outer side of the rotating rod 7 near the second support shell 6 and is fixed to the second support shell 6. This causes the rotating block 8 to drive the rotating rod 7 to rotate, adjusting the position of the threaded sleeve 9 on the outside of the rotating rod 7, thereby adjusting the distance between the first support shell 5 and the second support shell 6. The first support shell 5 is fixed with guide posts 10 at one end near the second support shell 6 and on both sides of the rotating rod 7. The second support shell 6 is fixed with guide sleeves 11 at one end near the first support shell 5 and at the position corresponding to the guide posts 10. The guide posts 10 and guide sleeves 11 are slidably connected, so that the rotation of the rotating rod 7 can be adjusted more stably to adjust the distance between the first support shell 5 and the second support shell 6 through the sliding adjustment of the guide posts 10 and guide sleeves 11.

[0050] The following is the usage process of the iron core pull belt with magnetic circuit optimization structure provided by this utility model: When in use, the distance between the first support shell 5 and the second support shell 6 is adjusted by pulling according to the different lengths of the pull belt 1, and the guide post 10 is allowed to enter the corresponding guide sleeve 11. At the same time, one end of the rotating rod 7 is allowed to contact the threaded sleeve 9. At this time, the sliding of the rotating rod 7 inside the first support shell 5 causes the rotating block 8 to move away from the second support shell 6. Then, the rotating block 8 is rotated, so that the rotating block 8 drives the rotating rod 7 to rotate, allowing the rotating rod 7 to enter the threaded sleeve 9 of the threaded connection. Then, the rotation of the rotating block 8 is paused.

[0051] Then, the external insulating bolts and other connecting parts are inserted into the bolt holes 4 on the pull strap 1 through the connection hole 13 to fix both ends of the pull strap 1. The rotating block 8 is rotated to drive the rotating rod 7 to rotate. The distance of the rotating rod 7 in the direction close to the second support shell 6 inside the threaded sleeve 9 is adjusted so that the rotating block 8 contacts the first support shell 5, thereby achieving stable adjustment of the gap between the first support shell 5 and the second support shell 6.

[0052] Then, depending on whether the pull belt 1 needs height adjustment, if no adjustment is needed, the first support shell 5 and the second support shell 6 can be directly fixed to the transformer. If adjustment is needed, rotate the positioning bolt 15 so that the positioning bolt 15 rotates inside the first support shell 5 or the second support shell 6, allowing the tail end of the positioning bolt 15 to disengage from the sliding limit hole 14. Then, adjust the height of the adjusting platform 12 inside the first support shell 5 or the second support shell 6 by sliding the adjusting platform 12. After the height of the adjusting platform 12 is adjusted, rotate the positioning bolt 15 in the opposite direction so that the positioning bolt 15 rotates inside the first support shell 5 or the second support shell 6, allowing the tail end of the positioning bolt 15 to enter the corresponding limit hole 14 on the corresponding adjusting platform 12, thereby limiting the height of the adjusting platform 12 inside the first support shell 5 or the second support shell 6 by the positioning bolt 15.

[0053] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. The present utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A core pull strip with an optimized magnetic circuit structure, characterized in that, It includes a pull strap (1), silicon steel sheets (2) and steel clips (3). The silicon steel sheets (2) are arranged vertically and tightly on both sides of the pull strap (1). The steel clips (3) are used to fix adjacent silicon steel sheets (2) on the same side. The pull strap (1) and the silicon steel sheets (2) are integrated by the steel clips (3).

2. The core pull strip with an optimized magnetic circuit structure according to claim 1, characterized in that, Bolt holes (4) are provided inside both ends of the pull strap (1).

3. The core pull strip with an optimized magnetic circuit structure according to claim 1, characterized in that, The steel clip (3) has a U-shaped structure.

4. The core pull strip with a magnetic circuit optimization structure according to claim 1, characterized in that, It also includes a support structure, which includes a first support shell (5), a second support shell (6) and an adjustment platform (12). The first support shell (5) is located at one end of the second support shell (6), and the adjustment platform (12) is slidably connected inside the top of the first support shell (5) and the second support shell (6).

5. A core pull strip with an optimized magnetic circuit structure according to claim 4, characterized in that, The top of the adjustment platform (12) is provided with evenly distributed connecting holes (13).

6. A core pull strip with an optimized magnetic circuit structure according to claim 4, characterized in that, The top of both sides of the first support shell (5) and the second support shell (6) are threaded with positioning bolts (15), and the positioning bolts (15) are slidably connected to the adjustment table (12).

7. A core pull strip with an optimized magnetic circuit structure according to claim 6, characterized in that, Limiting holes (14) are evenly distributed inside both sides of the adjustment platform (12), and the positioning bolt (15) is slidably connected to the limiting holes (14).

8. A core pull strip with an optimized magnetic circuit structure according to claim 4, characterized in that, An adjustment assembly for adjusting the spacing is assembled between the first support shell (5) and the second support shell (6). The adjustment assembly includes a rotating rod (7), a rotating block (8), a threaded sleeve (9), a guide post (10), and a guide sleeve (11). The end of the rotating rod (7) away from the second support shell (6) passes through the first support shell (5), and the rotating rod (7) is rotatably connected to the first support shell (5) through a bearing. The outer side of the rotating rod (7) near the second support shell (6) is threaded with a threaded sleeve (9), and the threaded sleeve (9) is fixed to the second support shell (6). The first support shell (5) near the second support shell (6) and on both sides of the rotating rod (7) are fixed with guide posts (10). The second support shell (6) near the first support shell (5) and at the position corresponding to the guide post (10) are fixed with guide sleeves (11). The guide post (10) and the guide sleeve (11) are slidably connected.

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