Variable cross-section transformer pulling plate

Abstract

The utility model discloses a variable cross-section transformer pulling plate, and belongs to the technical field of transformer manufacturing. The special-shaped pulling plate comprises a special-shaped pulling plate body, and reinforcing plates are arranged at the two ends of the special-shaped pulling plate body. A plurality of magnetism isolating grooves are formed in the special-shaped pulling plate; end chamfers are arranged on the symmetrical side edges of the end, provided with the reinforcing plate, of the special-shaped pulling plate. Middle chamfers are arranged on the symmetrical side edges of the middle of the special-shaped pulling plate. Due to the arrangement of the middle chamfer, the special-shaped pulling plate is more matched with the circular section of the iron core column, the situation that the special-shaped pulling plate protrudes out of the section range of the iron core is avoided, the size of the pulling plate is more matched with the iron core structure, stray loss generated by the pulling plate is smaller, and temperature rise of the pulling plate in the operation process of the transformer is lower. The insulation paper tube in the transformer body can be prevented from being cut by the pulling plate, the fault rate of the transformer can be effectively reduced, the energy consumption of the transformer is reduced, and the operation quality is more reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer manufacturing, and relates to a variable cross-section transformer pull plate. Background Art

[0002] In recent years, with the rapid development of power transmission and transformation projects, the urban electricity load has been increasing continuously, and the requirements for the main transformers of substations have been increasing continuously. To meet the requirements of the iron core structure fastening and related energy efficiency of the transformer, the transformer iron core is usually processed by the stacking process. After the stacking is completed, the pull plate is used to fasten it. However, the magnetic leakage flux of the transformer body at the position where the pull plate is located in the transformer is relatively large, which puts higher requirements on the iron core pull plate of the transformer. The pull plate refers to a mechanical structure used to adjust the number of turns of the coil in the transformer. By stretching and contracting the pull plate, the number of turns of the coil can be changed, thereby affecting the output voltage of the transformer. The transformer pull plate is usually made of copper material and has good electrical conductivity. However, the existing pull plate does not fit well with the size of the iron core, and the loss generated at the pull plate is relatively high. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the technical problems that the existing pull plate does not fit well with the size of the iron core and the loss generated at the pull plate is relatively high, and to provide a variable cross-section transformer pull plate.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a variable cross-section transformer pull plate, which includes a special-shaped pull plate, and reinforcing plates are arranged at both ends of the special-shaped pull plate; a plurality of magnetic isolation grooves are arranged on the special-shaped pull plate; end chamfers are arranged on the symmetric side edges of the end of the special-shaped pull plate where the reinforcing plate is arranged; and middle chamfers are arranged on the symmetric side edges of the middle of the special-shaped pull plate.

[0006] The further improvement of the utility model lies in:

[0007] The end chamfer is a C-shaped chamfer, and the chamfer angle is 50°-70°.

[0008] The middle chamfer is a C-shaped chamfer, and the chamfer angle is 20°-45°.

[0009] Web connection holes are arranged through the relative positions of the special-shaped pull plate and the reinforcing plate.

[0010] The plurality of magnetic isolation grooves are evenly distributed on the special-shaped pull plate.

[0011] The width of the magnetic isolation groove is 1mm-20mm.

[0012] The width of the magnetic isolation groove is 10mm.

[0013] The material of the special-shaped pull plate is non-magnetic steel.

[0014] The material of the reinforcing plate is non-magnetic steel.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model discloses a variable cross-section transformer pull plate. An end chamfer is arranged on the side of the end of the special-shaped pull plate, and a middle chamfer is arranged on the middle side. The setting of the end chamfer makes it convenient for the special-shaped pull plate to be connected to the reinforcing plate and the iron core web through the shaft head; the setting of the middle chamfer makes the special-shaped pull plate more fit the circular cross-section of the iron core column, avoiding the special-shaped pull plate protruding beyond the cross-section range of the iron core. The size of the pull plate is more suitable for the iron core structure, the stray loss generated by the pull plate is smaller, and the temperature rise at the pull plate during the operation of the transformer is lower. It can also prevent the insulating paper tube in the body from being cut by the pull plate, effectively reducing the failure rate of the transformer, reducing the energy consumption of the transformer, and making the operation quality more reliable.

[0017] Further, the end chamfer is a C-shaped chamfer with a chamfer angle of 50°-70°, and the middle chamfer is a C-shaped chamfer with a chamfer angle of 20°-45°. The end chamfer adopts a steep slope chamfer, and the middle chamfer adopts a gentle slope chamfer, making the advantages brought by the variable cross-section structure of the special-shaped pull plate more prominent.

[0018] Further, a plurality of magnetic isolation grooves are uniformly arranged on the special-shaped pull plate, which can increase the heat dissipation area of the transformer pull plate.

[0019] Further, the material of the special-shaped pull plate is non-magnetic steel, which can better control the temperature rise and reduce the stray loss of the transformer; the material of the reinforcing plate is non-magnetic steel, which is used to isolate the special-shaped pull plate from the web, avoiding the failure caused by the formation of a conduction loop through the special-shaped pull plate by the upper and lower clamping parts to generate a circulating current. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a three-dimensional structure diagram of a variable cross-section transformer pull plate in the present utility model;

[0022] Figure 2 It is a top view installation diagram of a variable cross-section transformer pull plate in the present utility model;

[0023] Figure 3 It is a middle cross-sectional view of the special-shaped pull plate of a variable cross-section transformer pull plate in the present utility model;

[0024] Figure 4 This is an end sectional view of a special-shaped pull plate of a variable cross-section transformer pull plate in the present utility model.

[0025] Wherein: 1 - web connection hole; 2 - reinforcing plate connection hole; 3 - reinforcing plate; 4 - special-shaped pull plate; 5 - magnetic isolation groove; 6 - middle chamfer; 7 - end chamfer; 8 - web; 9 - iron core cross-section range. Specific embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0028] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0029] In the description of the embodiments of the present utility model, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of the present utility model is normally placed. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0030] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0031] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and defined, if the terms "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] The following further describes the present utility model in detail with reference to the drawings:

[0033] See Figure 1 and Figure 2 The present utility model discloses a variable cross-section transformer pull plate, which includes a special-shaped pull plate 4. The material of the special-shaped pull plate 4 is non-magnetic steel, which can better control the temperature rise and reduce the stray loss of the transformer. Reinforcing plates 3 are arranged at both ends of the special-shaped pull plate 4. The material of the reinforcing plates 3 is non-magnetic steel, which is used to isolate the special-shaped pull plate from the web, avoiding the faults caused by the formation of a conduction loop through the special-shaped pull plate by the upper and lower clamping parts to generate a circulating current; a plurality of magnetic isolation grooves 5 are arranged on the special-shaped pull plate 4. The plurality of magnetic isolation grooves 5 are evenly distributed on the special-shaped pull plate 4. The width of the magnetic isolation grooves 5 is 1 mm - 20 mm, such as 10 mm. The magnetic isolation grooves 5 can increase the heat dissipation area of the transformer pull plate; end chamfers are arranged on the symmetric side edges of the end parts of the special-shaped pull plate 4 where the reinforcing plates 3 are arranged. The end chamfers are C-shaped chamfers, and the chamfering angle is 50° - 70°. The setting of the end chamfers makes it convenient for the special-shaped pull plate to be connected to the reinforcing plate and the iron core web through the shaft head; middle chamfers are arranged on the symmetric side edges of the middle part of the special-shaped pull plate 4. The middle chamfers are C-shaped chamfers, and the chamfering angle is 20° - 45°. The setting of the middle chamfers makes the special-shaped pull plate more fit the circular cross-section of the iron core column, avoiding the special-shaped pull plate protruding from the iron core cross-section range, the pull plate size is more suitable for the iron core structure, the stray loss generated by the pull plate is smaller, and the temperature rise at the pull plate during the operation of the transformer is lower. It can also prevent the insulating paper tube in the body from being cut by the pull plate, effectively reducing the failure rate of the transformer, and reducing the energy consumption of the transformer, and the operation quality is more reliable. Web connection holes 1 are penetrated through the relative positions of the special-shaped pull plate 4 and the reinforcing plates 3.

[0034] The installation and working process of the present utility model are as follows:

[0035] First, web connection holes 1 are opened at both ends of the special-shaped pull plate 4, and the shaft head passes through the web connection holes 1 to connect the special-shaped pull plate 4, the reinforcing plates 3 and the web 8 to ensure the fastening of each component inside the iron core.

[0036] Next, four threaded holes 2 are drilled at both ends of the special-shaped pull plate 4 for connecting the reinforcing plate 3 and the special-shaped pull plate 4. The reinforcing plate 3 is made of non-magnetic steel material, which can isolate the special-shaped pull plate 4 from the web 8 to avoid forming a conduction loop with the clamping parts.

[0037] Next, multiple magnetic isolation grooves 5 are formed on the special-shaped pull plate 4, which can increase the heat dissipation area of the special-shaped pull plate 4, reduce the volume of the special-shaped pull plate, and reduce the loss of the pull plate structural member.

[0038] Next, a steep-slope end chamfer 7 is formed at the end of the special-shaped pull plate 4. The use of a steep-slope chamfer at this location facilitates the installation of the reinforcing plate 3 and does not affect the placement of the transformer body paper tube at the same time.

[0039] Finally, a gentle-slope middle chamfer 6 is formed in the middle of the special-shaped pull plate 4. The gentle-slope chamfer can keep the whole special-shaped pull plate 4 within the cross-sectional range of the iron core column to avoid partial discharge caused by the protrusion of the edges and corners of the special-shaped pull plate 4.

[0040] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A variable cross-section transformer pull plate, characterized in that It includes a special-shaped pull plate (4), and reinforcing plates (3) are arranged at both ends of the special-shaped pull plate (4); a plurality of magnetic isolation grooves (5) are arranged on the special-shaped pull plate (4); end chamfers are arranged on the symmetric side edges of the end of the special-shaped pull plate (4) where the reinforcing plate (3) is arranged; middle chamfers are arranged on the symmetric side edges in the middle of the special-shaped pull plate (4).

2. The variable cross-section transformer pull plate according to claim 1, wherein, The end chamfer is a C-shaped chamfer, and the chamfer angle is 50°-70°.

3. The variable cross-section transformer pull plate according to claim 1, characterized in that, The middle chamfer is a C-shaped chamfer, and the chamfer angle is 20°-45°.

4. The variable cross-section transformer pull plate according to claim 1, wherein, Web connection holes (1) are penetrated and arranged at the relative positions of the special-shaped pull plate (4) and the reinforcing plate (3).

5. The variable cross-section transformer pull plate according to claim 1, wherein The plurality of magnetic isolation grooves (5) are evenly distributed on the special-shaped pull plate (4).

6. The variable cross-section transformer pull plate according to claim 1, characterized in that, The width of the magnetic isolation groove (5) is 1 mm-20 mm.

7. The variable cross-section transformer pull plate according to claim 6, characterized in that, The width of the magnetic isolation groove (5) is 10 mm.

8. The variable cross-section transformer pull plate according to claim 1, characterized in that The material of the special-shaped pull plate (4) is non-magnetic steel.

9. The variable cross-section transformer pull plate according to claim 1, characterized in that The material of the reinforcing plate (3) is non-magnetic steel.

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