Clamp and transformer

Abstract

The utility model discloses a clamp and a transformer, and relates to the technical field of transformer equipment, the clamp comprises a clamping plate body, the surface of the clamping plate body is concavely provided with a magnetic conductive groove, the length direction of the magnetic conductive groove is parallel to the length direction of the clamping plate body, the width of the magnetic conductive groove at the notch is a first width, and the width of the magnetic conductive groove at the notch is a second width. The width of the magnetic conductive groove at the groove bottom is a second width, and the first width is larger than the second width. The technical scheme provided by the utility model aims to weaken the eddy current effect of the clamp, so that the working efficiency of the transformer is improved and the service life of the transformer is prolonged.

Description

Technical Field

[0001] This application relates to the field of transformer equipment technology, and in particular to a clamp and a transformer. Background Technology

[0002] In transformers, clamps are typically made of metal and are used to secure the core laminations and support the windings. However, when the transformer is operating, the clamps are exposed to an alternating leakage magnetic field. Due to electromagnetic induction, eddy currents are generated in the metal material, leading to energy loss and localized temperature rise, which affects the transformer's efficiency and service life. Utility Model Content

[0003] The main objective of this application is to propose a clamp and a transformer that aims to reduce the eddy current effect of the clamp, thereby improving the working efficiency and service life of the transformer.

[0004] To achieve the above objectives, the clamping member proposed in this application includes a clamping plate body, the surface of which is recessed with a magnetic groove, the length direction of which is parallel to the length direction of which is clamping plate body, and the width of which is at the opening of which is a first width, and the width of which is at the bottom of which is a second width, wherein the first width is greater than the second width.

[0005] In one embodiment, the first width is 1.5 to 2 times the second width.

[0006] In one embodiment, the cross-section of the magnetic groove is trapezoidal.

[0007] In one embodiment, a plurality of magnetic grooves are distributed along the width direction of the clamping plate.

[0008] In one embodiment, the sum of the first widths of each of the magnetic grooves is 40% to 60% of the width of the clamping plate.

[0009] In one embodiment, the number of magnetic grooves is 2 to 4.

[0010] In one embodiment, the depth of the magnetic groove is 20% to 40% of the thickness of the clamping plate.

[0011] In one embodiment, the two ends of the magnetic groove extend through the side of the clamping plate.

[0012] In one embodiment, the clamping plate body is provided with an abutting surface for abutting the iron core, the magnetic groove is formed on the abutting surface, and the clamping member further includes multiple reinforcing plates erected on the side of the abutting surface.

[0013] This application also proposes a transformer comprising an iron core and the aforementioned clamps, wherein the iron core is clamped between the two clamps.

[0014] In the technical solution of this application, by recessing magnetic grooves on the surface of the clamping plate, the continuous structure of the clamping plate surface is transformed into a discontinuous structure, which can suppress the diffusion of leakage magnetic flux and the concentration of eddy currents. The width of the magnetic groove at the groove opening is greater than the width at the groove bottom. On the one hand, because the magnetic groove is wider at the groove opening, the current is less likely to cross the groove opening and is forced to flow along the groove wall, which can increase the total resistance of the current path and effectively limit the size and range of eddy currents. On the other hand, the groove sidewalls can extend obliquely, thereby lengthening the current flow path and increasing the complexity of the current flow path to further limit the formation of eddy currents. The extension direction of the magnetic groove is parallel to the length direction of the clamping member, meaning that they are parallel or approximately parallel. This allows the extension direction of the magnetic groove to be largely offset from the arrangement direction of the iron core laminations, which helps to increase the complexity of the current flow path between the iron core and the clamping member, thereby further limiting the formation of eddy currents. Therefore, this application improves the working efficiency and service life of the transformer by recessing magnetic grooves on the surface of the clamping plate. The magnetic grooves are easy to process, low in cost, require almost no additional maintenance, and can effectively suppress the diffusion of leakage magnetic flux and the concentration of eddy currents, thereby reducing the eddy current effect of the clamping parts. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of an embodiment of the transformer provided in this application;

[0017] Figure 2 A schematic diagram of the structure of one embodiment of the clamp provided in this application;

[0018] Figure 3 A schematic diagram of another embodiment of the clamp provided in this application;

[0019] Figure 4 A schematic diagram of another embodiment of the clamp provided in this application;

[0020] Figure 5 A three-dimensional structural schematic diagram of an embodiment of the clamp provided in this application from a perspective;

[0021] Figure 6 This is a three-dimensional structural schematic diagram of an embodiment of the clamp provided in this application from another perspective.

[0022] Explanation of icon numbers:

[0023] 11. Winding; 12. Core; 13. Clamping element;

[0024] 100. Clamping plate; 110. Magnetic guide groove; 120. Abutment surface; 200. Reinforcing plate.

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions 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, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" 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 in this application.

[0029] Please see Figure 1 This application proposes a clamp 13, which is applied to a transformer. The transformer also includes a winding 11 and an iron core 12, and the clamp 13 is used to fix the winding 11 and the iron core 12.

[0030] When a transformer is operating, alternating current flows through its internal windings. This causes an alternating leakage magnetic field in the clamping components, inducing eddy currents within the components. These eddy currents result in energy loss, known as eddy current loss, which reduces the transformer's efficiency. This is because the resistance of the conductors to the eddy currents converts some electrical energy into heat. This energy is not used for the intended power transmission or conversion but is wasted as heat. Furthermore, the additional heating caused by eddy currents can raise the transformer's temperature, which is particularly detrimental to the transformer's insulation materials. This can accelerate insulation aging and, in severe cases, even cause insulation breakdown, affecting the transformer's safe operation. In addition, the localized heating and material expansion and contraction caused by the eddy current effect can lead to stress changes in the transformer's mechanical structure, thereby increasing the noise level during operation.

[0031] In related technologies, welding magnetic conductors or adding magnetic shielding to the surface of the clamps presents problems such as complex processes, high costs, and difficult maintenance.

[0032] Please see Figure 1 , Figure 2 and Figure 5 In one embodiment of this application, the clamp 13 includes a clamping plate 100. The surface of the clamping plate 100 is recessed with a magnetic groove 110. The length direction of the magnetic groove 110 is parallel to the length direction of the clamping plate 100. The width of the magnetic groove 110 at the groove opening is a first width d1, and the width of the magnetic groove 110 at the groove bottom is a second width d2. The first width d1 is greater than the second width d2.

[0033] It can be understood that the clamping plate 100 is the plate that clamps and fixes the iron core 12 in the transformer. By recessing the magnetic groove 110 on the surface of the clamping plate 100, the continuous structure of the surface of the clamping plate 100 is transformed into a discontinuous structure, which can suppress the diffusion of leakage flux and the concentration of eddy currents. Since eddy currents are closed-loop currents flowing along the surface of a conductor, when the current flows through the magnetic groove 110, it will bypass the groove wall of the magnetic groove 110, which can effectively break potential eddy current loops. Even if multiple small closed eddy current loops are formed, the harm is far less than the formation of a large closed eddy current loop. Furthermore, the setting of the magnetic groove 110 also increases the complexity of the current flow path, which actually increases the resistance on the current path, thereby reducing the intensity of eddy currents. In addition, the magnetic groove 110 can also change the magnetic field distribution, further helping to reduce the formation of eddy currents.

[0034] Furthermore, the magnetic groove 110 has a groove opening and a groove bottom. It can be understood that the groove opening and the groove bottom are distributed sequentially along the concave direction of the magnetic groove 110, that is, along the thickness direction of the clamping plate 100. The first width d1 of the magnetic groove 110 is greater than the second width d2, that is, the width of the magnetic groove 110 at the groove opening is greater than the width of the magnetic groove 110 at the groove bottom. On the one hand, because the magnetic groove 110 is wider at the groove opening, the current is less likely to cross the groove opening of the magnetic groove 110 and is forced to flow along the groove wall of the magnetic groove 110, which can increase the total resistance of the current path and effectively limit the size and range of eddy currents. On the other hand, the groove sidewall of the magnetic groove 110 can extend obliquely, thereby lengthening the current flow path and increasing the complexity of the current flow path to further limit the formation of eddy currents.

[0035] In addition, in this embodiment, please refer to Figure 5 The extension direction of the magnetic groove 110 is parallel to the length direction of the clamp 13, meaning they are parallel or nearly parallel. This allows the extension direction of the magnetic groove 110 to be significantly offset from the arrangement direction of the laminations of the iron core 12, thereby increasing the complexity of the current flow path between the iron core 12 and the clamp 13, further limiting the formation of eddy currents. Furthermore, when the length direction of the magnetic groove 110 is parallel to the length direction of the clamping plate 100, the magnetic field can be guided more effectively, reducing magnetic resistance and thus improving the magnetic permeability of the transformer. It also helps maintain the overall structural strength of the clamp 13, preventing deformation or damage caused by external stress or internal magnetic stress.

[0036] Therefore, this application provides a magnetic groove 110 recessed on the surface of the clamping plate 100. The magnetic groove 110 is easy to process, low in cost, requires almost no additional maintenance, and can effectively suppress the diffusion of leakage flux and the concentration of eddy currents, thereby reducing the eddy current effect of the clamping member 13 and improving the working efficiency and service life of the transformer.

[0037] Preferably, the first width d1 is 1.5 to 2 times the second width d2, which can ensure the limitation of eddy currents while facilitating the processing and forming of the magnetic groove 110. Specifically, the first width d1 can be 1.5, 1.6, 1.7, 1.8, 1.9, or 2 times the second width d2. Of course, in other embodiments, the first width d1 can also be 1.2, 1.4, 2.2, or 2.4 times the second width d2.

[0038] It can be understood that the cross-section of the magnetic groove 110 is obtained by cutting along its width direction. The cross-section of the magnetic groove 110 refers to the closed shape formed by the contour lines of the groove wall of the magnetic groove 110 extending past the groove opening, such as... Figures 2 to 4As shown, the cross-section of the magnetic groove 110 can be an axisymmetric shape to ensure the uniformity of magnetic flux distribution. Of course, the cross-section of the magnetic groove 110 can also be a non-axisymmetric shape.

[0039] In one implementation, please refer to Figure 2 The magnetic groove 110 has a trapezoidal cross-section. This facilitates the machining of the magnetic groove 110 while ensuring the structural strength of the clamping plate 100. Of course, in other embodiments, the cross-section of the magnetic groove 110 can also be other shapes, for example... Figure 3 The arc shown Figure 4 The pentagon or other shape shown satisfies that the first width d1 is greater than the second width d2.

[0040] Specifically, the magnetic groove 110 can be formed by milling or integrally formed on the surface of the clamping plate 100 by stamping. In both cases, the magnetic groove 110 can be easily and reliably formed.

[0041] In one implementation, please refer to Figure 5 and Figure 6 Multiple magnetically conductive grooves 110 are distributed along the width direction of the clamping plate 100. This creates a multi-segmented, discontinuous structure, further dispersing eddy currents and thus better suppressing the diffusion of leakage flux and the concentration of eddy currents. Furthermore, the uniform spacing of the multiple magnetically conductive grooves 110 along the width direction of the clamping plate 100 helps improve the uniformity of magnetic flux distribution, thereby increasing electromagnetic efficiency and reducing hot spots or overheated areas caused by uneven local magnetic flux density. This contributes to improving the transformer's operating performance and service life.

[0042] Specifically, it is preferable to have 2 to 4 magnetic grooves 110. The number of magnetic grooves 110 can be 2, 3, or 4. This allows for full utilization of the surface area of ​​the clamping plate 100 to create the magnetic grooves 110, and ensures that each magnetic groove 110 has sufficient width to guarantee the dispersing effect on eddy currents. Of course, in other embodiments, the number of magnetic grooves 110 can also be adjusted to 1, 5, or 6, etc.

[0043] In one implementation, please refer to Figure 2The sum of the first widths d1 of each of the magnetically conductive grooves 110 is 40% to 60% of the width D of the clamping plate 100. It can be understood that the ratio of the sum of the first widths d1 of each magnetically conductive groove 110 to the total width D of the clamping plate 100 is also the ratio of the groove width on the surface of the clamping plate 100. In this embodiment, this ratio is between 40% and 60%, which ensures that the grooved and ungrooved areas on the surface of the clamping plate 100 are relatively uniform and balanced, thereby ensuring both the structural strength of the clamping plate 100 and the dispersing effect on eddy currents. This ratio can be 40%, 45%, 50%, 55%, or 60%, etc. Of course, in other embodiments, this ratio can be adjusted to a range less than 40%, such as 30% or 35%, or it can be adjusted to a range greater than 60%, such as 62% or 65%, depending on the requirements.

[0044] In one implementation, please refer to Figure 2 The groove depth h1 of the magnetic groove 110 is 20% to 40% of the thickness h2 of the clamping plate 100. It can be understood that the groove depth ratio of the magnetic groove 110 is the ratio of the groove depth h1 of the magnetic groove 110 to the thickness h2 of the clamping plate 100, i.e., h1 / h2. In this embodiment, this ratio is between 20% and 40%, which ensures that the clamping plate 100 at the location of the magnetic groove 110 has sufficient thickness, thereby possessing sufficient structural strength to ensure the structural stability of the clamping plate 100. This ratio can be 20%, 25%, 30%, 35%, or 40%, etc. Of course, in other embodiments, this ratio can be adjusted to a range less than 20%, such as 15% or 18%, or it can be adjusted to a range greater than 40%, such as 42% or 45%.

[0045] In one embodiment, both ends of the magnetic groove 110 extend through the sides of the clamping plate 100. This prevents eddy currents from forming around the magnetic groove 110 on the surface of the clamping plate 100, effectively suppressing the formation of large eddy current loops and improving the transformer's performance and lifespan. Alternatively, in other embodiments, the magnetic groove 110 may extend through only one end of the clamping plate 100, or neither end of the magnetic groove 110 may extend through the sides of the clamping plate 100.

[0046] In one implementation, please refer to Figure 5 and Figure 6The clamping plate 100 is provided with an abutment surface 120 for abutting the iron core 12, and the magnetic groove 110 is formed on the abutment surface 120. That is, the iron core 12 will be clamped between the abutment surfaces 120 of the two clamping plates 100. The magnetic groove 110 on the abutment surface 120 helps to increase the complexity of the current flow path between the iron core 12 and the clamp 13, effectively suppressing the diffusion of leakage magnetic flux and the concentration of eddy current. Of course, in other embodiments, the magnetic groove 110 may also be formed on other surfaces of the clamping plate 100.

[0047] Further, please refer to Figure 5 and Figure 6 The clamping member 13 further includes multiple reinforcing plates 200 erected on the opposite side of the abutment surface 120. Specifically, the multiple reinforcing plates 200 can be arranged in a grid pattern, including two wing plates connected to the long side of the clamping plate body 100, and multiple rib plates connecting the two web plates. Thus, the clamping plate body 100 is equivalent to a web plate structure. This improves the structural strength of the clamping member 13, thereby ensuring the clamping and fixing effect on the iron core 12. Of course, in other embodiments, the clamping member 13 can also have other structural forms.

[0048] This application also proposes a transformer including a clamp 13. The specific structure of the clamp 13 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, which will not be repeated here. Please refer to... Figure 1 The transformer also includes an iron core 12 and a winding 11. The clamp 13 is used to fix the iron core 12 and the winding 11, and the iron core 12 is clamped between the two clamps 13.

[0049] The above description is merely an exemplary embodiment of this application and does not limit the scope of protection of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A clamping component used in a transformer, characterized in that, The clamping member includes a clamping plate (100), and a magnetic groove (110) is recessed on the surface of the clamping plate (100). The length direction of the magnetic groove (110) is parallel to the length direction of the clamping plate (100), and the width of the magnetic groove (110) at the groove opening is a first width d1, and the width of the magnetic groove (110) at the groove bottom is a second width d2. The first width d1 is greater than the second width d2.

2. The clamp as described in claim 1, characterized in that, The first width d1 is 1.5 to 2 times the second width d2.

3. The clamp as described in claim 1, characterized in that, The cross-section of the magnetic groove (110) is trapezoidal.

4. The clamp as described in claim 1, characterized in that, The magnetic grooves (110) are distributed in multiple ways along the width direction of the clamping plate (100).

5. The clamp as described in claim 4, characterized in that, The sum of the first widths d1 of each of the magnetic grooves (110) is 40% to 60% of the width D of the clamping plate (100).

6. The clamp as described in claim 4, characterized in that, The number of magnetic grooves (110) is 2 to 4.

7. The clamp as described in claim 1, characterized in that, The depth h1 of the magnetic groove (110) is 20% to 40% of the thickness h2 of the clamping plate (100).

8. The clamp as described in claim 1, characterized in that, The two ends of the magnetic groove (110) extend through the side of the clamping plate (100).

9. The clamp as described in any one of claims 1 to 8, characterized in that, The clamping plate (100) is provided with an abutting surface (120) for abutting the iron core (12), the magnetic groove (110) is formed on the abutting surface (120), and the clamp also includes multiple reinforcing plates (200) erected on the opposite side of the abutting surface (120).

10. A transformer, characterized in that, It includes an iron core (12) and a clamp (13) as described in any one of claims 1 to 9, wherein the iron core (12) is clamped between two of the clamps (13).

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