An oil-immersed transformer operating with low noise

Abstract

This utility model relates to an oil-immersed transformer, specifically a low-noise operating oil-immersed transformer, including a support plate. Mounting seats for installing the transformer are symmetrically fixed on the support plate. The transformer includes at least a transformer housing, and an iron core is fixedly installed inside the transformer housing. The iron core includes a core column and yokes symmetrically arranged at both ends of the core column. Windings are sleeved on the outer side of the core column. Several insulating rods are fixedly installed inside the transformer housing outside the windings. Pressure plates are symmetrically slidably installed on the insulating rods. Two of the pressure plates are located at both ends of the windings, and connecting rods are threaded onto the outer side of the upper end of the insulating rods. By setting the pressure plates, the micro-displacement energy generated during winding operation can be directly absorbed and buffered, avoiding rigid collisions between the windings and the yokes. The adjustable preload disc spring assembly provides continuous and stable axial clamping force to the pressure plates, achieving active suppression and secondary buffering of winding vibration, significantly reducing the mechanical noise inside the transformer.

Description

Technical Field

[0001] This utility model relates to an oil-immersed transformer, and more particularly to an oil-immersed transformer with low noise operation. Background Technology

[0002] Oil-immersed transformers are core equipment in power systems, responsible for voltage transformation, power distribution, and transmission. Their operational stability and noise levels directly impact the surrounding environment and equipment lifespan. During operation, the transformer's internal windings generate periodic electrodynamic forces due to alternating electromagnetic fields, leading to winding vibrations and slight displacements. This vibration is transmitted to the core and other supporting structures, causing rigid collisions and friction between components, resulting in significant mechanical noise.

[0003] In existing technologies, clamping blocks or plates are often used to axially compress the windings to suppress vibration. However, traditional clamping structures are often inconvenient to adjust, the preload is difficult to control precisely, and they lack effective buffering mechanisms. After long-term operation, the clamping force is prone to decrease due to material creep or loosening, thus weakening the vibration reduction effect. At the same time, the overall vibration of the transformer during operation is transmitted to the mounting foundation through the base. If the mounting structure is too rigid, it will not only amplify the vibration noise but may also generate additional noise due to friction.

[0004] Therefore, there is an urgent need in the existing technology for an oil-immersed transformer that can effectively suppress internal winding vibration and slow down the transmission of vibration to the outside, so as to comprehensively manage the noise from both the source and the propagation path, in order to achieve low-noise and stable operation. Utility Model Content

[0005] The main objective of this invention is to provide an oil-immersed transformer that operates with low noise, in order to solve the problems raised in related technologies.

[0006] To achieve the above objectives, according to one aspect of this utility model, a low-noise oil-immersed transformer is provided, comprising a support plate, on which mounting seats for installing the transformer are symmetrically fixedly disposed. The transformer includes at least a transformer housing, and an iron core is fixedly disposed within the transformer housing. The iron core includes a core column and iron yokes symmetrically disposed at both ends of the core column, and a winding is sleeved on the outer side of the core column. A plurality of insulating rods are fixedly disposed within the transformer housing outside the windings, and pressure plates are symmetrically slidably disposed on the insulating rods. Two of the pressure plates are located at both ends of the windings, and a connecting rod is threaded onto the outer side of the upper end of the insulating rod.

[0007] Furthermore, the transformer housing has an upper clamping plate and a lower clamping plate symmetrically fixed on its inner wall, and the two iron yoke sidewalls are in close contact with the upper clamping plate and the lower clamping plate, respectively.

[0008] Furthermore, positioning holes are provided through both the upper and lower clamping plates, the insulating rod passes through the positioning holes, and the upper end of the insulating rod passes through the transformer housing, while the upper end of the connecting rod is located outside the transformer housing.

[0009] Furthermore, the pressure plate is located between the winding and the yoke, and the pressure plate has a corrugated structure and is made of an elastic material.

[0010] Furthermore, a limiting plate is fixedly connected to the bottom of the connecting rod. The diameter of the limiting plate is larger than the diameter of the connecting rod, and several disc springs are stacked at the bottom of the limiting plate, with the disc springs located on the top of the pressure plate above.

[0011] Furthermore, a base is symmetrically fixedly provided at the bottom of the transformer housing. The base is C-shaped with the opening facing outwards, and several heat dissipation pipes are fixedly provided on the outer wall of the transformer housing.

[0012] Furthermore, a connecting plate is floatingly mounted on the mounting base, an expansion layer is fixedly disposed between the inner wall of the mounting base and the outer wall of the connecting plate, and the mounting base and the connecting plate have an L-shaped cross section, with the base fixedly mounted on the connecting plate.

[0013] Furthermore, the support plate includes at least an insulating isolation layer fixedly disposed at the bottom of the mounting base, a high-damping elastic layer fixedly disposed at the bottom of the insulating isolation layer, and a metal substrate layer fixedly disposed at the bottom of the high-damping elastic layer.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In this low-noise oil-immersed transformer, the corrugated elastic pressure plates installed at both ends of the winding can directly absorb and buffer the micro-displacement energy generated during winding operation, preventing rigid collisions between the winding and the yoke. Combined with an adjustable preload disc spring assembly, it provides continuous and stable axial clamping force to the pressure plates, achieving active suppression and secondary buffering of winding vibration, significantly reducing mechanical noise sources inside the transformer.

[0015] 2. In this low-noise oil-immersed transformer, a floating mounting structure with a built-in expansion layer is used to flexibly connect the transformer shell to the rigid support plate. This structure can effectively isolate and attenuate the transmission of transformer body vibration to the foundation and avoid hard contact friction between the shell and the mounting foundation, thereby reducing vibration and noise from the propagation path. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the oil-immersed transformer with low-noise operation in a preferred embodiment of this utility model; Figure 2This is one of the cross-sectional views of a low-noise oil-immersed transformer in a preferred embodiment of this utility model; Figure 3 This is a cross-sectional view of the support plate and mounting base in a preferred embodiment of the present invention; Figure 4 This is a second cross-sectional view of an oil-immersed transformer operating with low noise in a preferred embodiment of this utility model; Figure label: 1. Support plate; 11. Metal substrate layer; 12. High-damping elastic layer; 13. Insulating layer; 2. Mounting base; 21. Expansion layer; 22. Connecting plate; 3. Transformer housing; 31. Base; 32. Heat dissipation pipe; 33. Lower clamping plate; 34. Upper clamping plate; 41. Iron yoke; 42. Core pillar; 5. Insulating rod; 51. Connecting rod; 52. Disc spring; 6. Pressure plate; 7. Winding. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0018] This embodiment provides a low-noise oil-immersed transformer, including a support plate 1, which has a composite layered structure. Mounting seats 2 for installing the transformer are symmetrically fixed on the support plate 1. The transformer includes at least a transformer housing 3. An iron core is fixedly installed inside the transformer housing 3. The iron core includes a core column 42 and yokes 41 symmetrically arranged at both ends of the core column 42. A winding 7 is sleeved on the outside of the core column 42. Several insulating rods 5 are fixedly installed inside the transformer housing 3 outside the windings 7. Pressure plates 6 are symmetrically slidably arranged on the insulating rods 5, with two pressure plates 6 located at both ends of the windings 7. A connecting rod 51 is threaded onto the outer side of the upper end of each insulating rod 5.

[0019] like Figure 2 and Figure 4 As shown, the transformer housing 3 has an upper clamping plate 34 and a lower clamping plate 33 symmetrically fixed on the inner wall. The side walls of the two yokes 41 are in close contact with the upper clamping plate 34 and the lower clamping plate 33, respectively. Insulating buffer pads are attached to the contact surfaces of the side walls of the yokes 41 with the upper clamping plate 34 and the lower clamping plate 33, which not only ensures electrical insulation, but also further absorbs high-frequency vibration and reduces the transmission of structural noise to the tank wall.

[0020] like Figure 1 , Figure 2 and Figure 4As shown, positioning holes are provided on both the upper clamping plate 34 and the lower clamping plate 33. The insulating rod 5 passes through the positioning holes, and the upper end of the insulating rod 5 passes through the transformer housing 3. The upper end of the connecting rod 51 is located outside the transformer housing 3.

[0021] like Figure 2 and Figure 4 As shown, the pressure plate 6 is located between the winding 7 and the yoke 41, and the pressure plate 6 has a corrugated structure. The pressure plate 6 is made of an elastic material, preferably a non-metallic material with high elasticity, oil resistance, and aging resistance, such as epoxy glass cloth laminate or silicone rubber composite material. Its corrugated structure design not only increases the axial compression stroke but also enhances the lateral stability, preventing displacement or jamming under pressure. During the operation of the transformer, the winding 7 vibrates slightly due to electromagnetic force, which may cause it to collide with the iron core and generate noise. The pressure plate 6 is installed to compress the winding 7 when it undergoes slight displacement, preventing it from colliding with the iron core and thus reducing noise.

[0022] like Figure 2 and Figure 4 As shown, a limiting plate is fixedly connected to the bottom of the connecting rod 51. The diameter of the limiting plate is larger than the diameter of the connecting rod 51, and several disc springs 52 are stacked at the bottom of the limiting plate. The disc springs 52 are located on the top of the pressure plate 6 above. The limiting plate is used to press the uppermost disc spring 52. As needed, the connecting rod 51 is rotated. Due to the threaded connection between the connecting rod 51 and the insulating rod 5, the connecting rod 51 can move vertically along the insulating rod 5, thereby compressing the disc springs 52. By adjusting the height position of the connecting rod 51 on the insulating rod 5, the preload of the disc springs 52 is adjusted, providing further pressure to the pressure plate 6, thereby clamping the winding 7 and further reducing the displacement of the winding 7.

[0023] like Figure 1 As shown, a base 31 is symmetrically fixed at the bottom of the transformer housing 3. The base 31 is C-shaped with the opening facing outward. Several heat dissipation pipes 32 are fixedly installed on the outer wall of the transformer housing 3. The heat dissipation pipes 32 are evenly distributed along the outer wall of the transformer housing 3. Rubber vibration damping pads are installed at their fixing points to avoid the heat dissipation pipes 32 from resonating due to the vibration of the oil tank and generating additional noise. At the same time, the arrangement of the heat dissipation pipes 32 avoids the main vibration mode nodes, thereby improving the overall structural stability.

[0024] like Figure 1 and Figure 3As shown, a connecting plate 22 is floatingly mounted on the mounting base 2. An expansion layer 21 is fixedly mounted between the inner wall of the mounting base 2 and the outer wall of the connecting plate 22. The expansion layer 21 is made of a compressible elastic material (such as rubber), allowing the connecting plate 22 to float within the mounting base 2 to a limited extent. The mounting base 2 and the connecting plate 22 have an L-shaped cross-section. The base 31 is fixedly mounted on the connecting plate 22 by bolts or other fasteners. If the transformer housing 3 is directly mounted on the support plate 1, the transformer housing 3 may vibrate and move slightly during transformer operation, generating noise due to friction with the surface of the support plate 1. By mounting it on the connecting plate 22, the connecting plate 22 vibrates or moves slightly, and the expansion layer 21 is compressed accordingly, avoiding noise caused by rigid contact between the structures.

[0025] like Figure 3 As shown, the support plate 1 includes at least an insulating isolation layer 13 fixedly disposed at the bottom of the mounting base 2. Its function is to prevent the formation of a grounding circuit between the transformer shell 3 and the foundation, thereby avoiding circulating current and local overheating. A high-damping elastic layer 12 is fixedly disposed at the bottom of the insulating isolation layer 13 as a core vibration damping layer. It is made of high-damping material and is used to dissipate vibration energy. A metal substrate layer 11 is fixedly disposed at the bottom of the high-damping elastic layer 12. The metal substrate layer 11 mainly provides structural stiffness to prevent the support plate 1 from bending and deforming. Its surface is coated with a constraint layer damping material (such as asphalt-based or epoxy-based damping paint) to suppress its own resonance.

[0026] In practical use, the base 31 at the bottom of the transformer housing 3 is fixedly installed on the connecting plate 22 to ensure a firm connection. Before the transformer is put into operation, the connecting rod 51 is manually rotated according to the design requirements. Since the connecting rod 51 and the insulating rod 5 are threadedly connected, the rotation can make it move in the vertical direction, thereby compressing the disc spring 52 at the top. By adjusting the height of the connecting rod 51, the preload of the disc spring 52 is set, so that the pressure plate 6 applies appropriate axial pressure to the winding 7, ensuring that the winding 7 remains stable during normal operation and reducing initial loosening. When the transformer is working, the winding 7 vibrates and undergoes slight displacement due to electromagnetic force. At this time, the wave-shaped elastic pressure plate 6 located at both ends of the winding 7 is compressed and undergoes elastic deformation, absorbing displacement energy and effectively preventing the winding 7 from rigidly colliding with the yoke 41, thus significantly reducing the mechanical noise generated. If the vibration is large, the upper pressure plate 6 further compresses the disc spring 52 stacked on top of it to achieve secondary buffering and enhance the vibration reduction effect. The overall vibration of the transformer during operation is transmitted to the connecting plate 22 through the base 31. The connecting plate 22 floats in the mounting base 2, and the expansion layer 21 between it and the mounting base 2 is compressed or extended accordingly to avoid noise generated by hard contact friction.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A low-noise oil-immersed transformer, comprising a support plate (1), wherein mounting seats (2) for mounting the transformer are symmetrically fixed on the support plate (1), and the transformer includes at least a transformer housing (3), characterized in that, The transformer housing (3) is fixedly provided with an iron core, which includes a core column (42) and iron yokes (41) symmetrically arranged at both ends of the core column (42). A winding (7) is sleeved on the outside of the core column (42). Several insulating rods (5) are fixedly provided inside the transformer housing (3) on the outside of the winding (7). Pressure plates (6) are symmetrically slidably arranged on the insulating rods (5). Two pressure plates (6) are located at both ends of the winding (7). A connecting rod (51) is threaded on the outer side of the upper end of the insulating rod (5).

2. The low-noise oil-immersed transformer according to claim 1, characterized in that, The transformer housing (3) has an upper clamping plate (34) and a lower clamping plate (33) fixedly and symmetrically on the inner wall. The side walls of the two iron yokes (41) are in close contact with the upper clamping plate (34) and the lower clamping plate (33) respectively.

3. The low-noise oil-immersed transformer according to claim 2, characterized in that, Positioning holes are provided on both the upper clamping plate (34) and the lower clamping plate (33). The insulating rod (5) passes through the positioning holes, and the upper end of the insulating rod (5) passes through the transformer housing (3). The upper end of the connecting rod (51) is located outside the transformer housing (3).

4. The low-noise oil-immersed transformer according to claim 1, characterized in that, The pressure plate (6) is located between the winding (7) and the yoke (41), and the pressure plate (6) has a wave-like structure and is made of an elastic material.

5. The low-noise oil-immersed transformer according to claim 1, characterized in that, The bottom of the connecting rod (51) is fixedly connected to a limiting plate. The diameter of the limiting plate is larger than the diameter of the connecting rod (51). Several disc springs (52) are stacked at the bottom of the limiting plate. The disc springs (52) are located on the top of the pressure plate (6) above.

6. The low-noise oil-immersed transformer according to claim 1, characterized in that, The transformer housing (3) is symmetrically fixed with a base (31) at the bottom. The base (31) is C-shaped with the opening facing outward, and a number of heat dissipation pipes (32) are fixedly installed on the outer wall of the transformer housing (3).

7. The low-noise oil-immersed transformer according to claim 6, characterized in that, A connecting plate (22) is floating on the mounting base (2). An expansion layer (21) is fixedly provided between the inner wall of the mounting base (2) and the outer wall of the connecting plate (22). The mounting base (2) and the connecting plate (22) have an L-shaped cross section. The base (31) is fixedly installed on the connecting plate (22).

8. The low-noise oil-immersed transformer according to claim 7, characterized in that, The support plate (1) includes at least an insulating layer (13) fixedly disposed at the bottom of the mounting base (2), a high-damping elastic layer (12) fixedly disposed at the bottom of the insulating layer (13), and a metal substrate layer (11) fixedly disposed at the bottom of the high-damping elastic layer (12).

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