Three-dimensional roll core transformer with high vibration and noise reduction performance

Abstract

The application discloses a three-dimensional wound core transformer with high vibration and noise reduction performance, which comprises a transformer body and an oil tank shell, the transformer body is arranged in the oil tank shell, the transformer body comprises a three-dimensional wound core, a coil winding, an upper clamping plate and a lower clamping plate, a ball screw is arranged at the center of the transformer body, the ball screw penetrates through the upper clamping plate, the lower clamping plate and the bottom surface of the oil tank shell, the bottom end of the ball screw is connected with an adjusting motor, a nut pair matched with the ball screw is arranged on the upper clamping plate, a plurality of groups of pull rods are arranged on the outer periphery of the upper clamping plate and the lower clamping plate, and clamping nuts are arranged on the upper and lower ends of the pull rods. The adjusting motor is used for driving the ball screw to rotate, the upper clamping plate is driven to ascend and descend, the axial clamping force of the three-dimensional wound core on the upper clamping plate is adjusted in real time, the periodic magnetic induced extension deformation characteristics of the transformer under different load working conditions are adapted, the interlayer slip and vibration friction of the core are weakened, and the active vibration and noise reduction effect is realized.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to a three-dimensional wound core transformer with high vibration reduction and noise reduction performance. Background Technology

[0002] Three-dimensional wound core transformers are widely used in urban and rural power distribution and industrial and mining power supply due to their advantages such as continuous core magnetic circuit, low magnetic loss, and significant energy saving. Compared with traditional laminated core transformers, three-dimensional wound core structures have more uniform magnetic flux distribution, lower no-load loss, and outstanding energy-saving advantages. However, because the three-dimensional wound core is a continuous wound structure, it will produce a significant magnetostrictive effect under the action of alternating electromagnetic fields, causing the core to periodically expand and contract, which in turn leads to core vibration and radiates operating noise.

[0003] Existing traditional three-dimensional wound core transformers mostly use fixed, rigid clamping structures for the core and coils. After assembly, the clamping force cannot be dynamically adjusted according to the actual load conditions. This makes it impossible to adapt to the different variations in magnetostrictive deformation amplitude under light load, full load, and overload conditions. This easily leads to problems such as insufficient clamping causing slippage and friction between silicon steel sheets, or excessive clamping causing stress concentration in the core and exacerbating vibration, resulting in poor noise and vibration reduction effects. For example, Chinese patent publication number CN119197757A discloses a three-dimensional wound core transformer based on amorphous alloy-silicon steel layered structure. This patent utilizes the inherent hardness, thinness, and brittleness of amorphous alloys. Compared to silicon steel transformers of the same capacity, amorphous alloy transformers are more prone to generating small amorphous alloy fragments during vibration. This composite core provides a certain degree of suppression of these fragments, but it cannot dynamically adjust the clamping force according to the actual load conditions. Chinese Patent Publication No. CN11919775A discloses a transformer reactor vibration reduction and noise reduction test device and method. By setting the tank shell as a detachable tank cover, tank wall and tank bottom structure, the adjustment of the iron core clamping force can only be made after the tank cover and tank wall are opened when the transformer is stopped. It cannot adapt to the difference in magnetostrictive deformation amplitude under different operating conditions of light load, full load and overload of transformer for real-time adjustment. Summary of the Invention

[0004] The main objective of this invention is to overcome the defects of the aforementioned background technology and provide a three-dimensional wound core transformer with high vibration reduction and noise reduction performance.

[0005] To achieve the above objectives, the present invention proposes a three-dimensional wound core transformer with high vibration reduction and noise reduction performance, comprising a transformer body and an oil tank housing. The transformer body is disposed within the oil tank housing. The transformer body includes a three-dimensional wound core, coil windings sleeved on the three-dimensional wound core, and upper and lower clamping plates respectively clamping the upper and lower ends of the three-dimensional wound core. A ball screw is vertically disposed at the center of the transformer body. The ball screw passes through the upper clamping plate, the lower clamping plate, and the bottom surface of the oil tank housing. An adjusting motor is connected to the bottom end of the ball screw located outside the oil tank housing. A nut pair that mates with the ball screw is fixedly disposed on the upper clamping plate. Several sets of tie rods are symmetrically disposed on the outer periphery of the upper and lower clamping plates. Clamping nuts are respectively disposed at the upper and lower ends of the several sets of tie rods. The adjusting motor drives the ball screw to rotate, thereby causing the upper clamping plate to move vertically to adjust the axial clamping force on the three-dimensional wound core.

[0006] Furthermore, two sets of coil clamping frames are fitted onto the three-dimensional coil core. Each coil clamping frame has a clamping ring at its corner. The two sets of coil clamping frames are clamped to the upper and lower end faces of the coil winding by the clamping rings. The middle part of the pull rod passes through the coil clamping frame. A clamping spring is fitted on the outer periphery of each end of the pull rod. The bottom end of the upper clamping spring abuts against the upper surface of the coil clamping frame, and the top end abuts against the corresponding upper clamping plate. The bottom end of the lower clamping spring abuts against the lower clamping plate, and the top end abuts against the corresponding lower surface of the coil clamping frame. A damping rod is connected between the two sets of coil clamping frames.

[0007] Furthermore, the damping rod includes a cylinder and a piston rod. One end of the piston rod located inside the cylinder is fixedly connected to a piston. Both ends of the cylinder are respectively provided with oil compensation holes that communicate with the inside of the oil tank housing. The piston is provided with throttling holes that communicate with the cavities on both sides of the cylinder.

[0008] Furthermore, the inner wall of the oil tank shell is vertically provided with guide bars, and the side walls of the upper clamping plate and the lower clamping plate are provided with guide grooves corresponding to the positions of the guide bars.

[0009] Furthermore, the upper clamping plate and the lower clamping plate are respectively provided with a plurality of U-shaped limiting blocks, and the upper yoke and lower yoke of the three-dimensional coiled iron core are respectively inserted into the U-shaped limiting blocks.

[0010] Furthermore, a first rubber damping pad is fixedly provided on the inner wall of the U-shaped limiting block.

[0011] Furthermore, the bottom surface of the upper clamping plate is provided with several floating clamping blocks. The floating clamping blocks are integrated elastic metal cantilever structures. The cross-section of the floating clamping blocks is a right-angled trapezoid with an opening at the bottom. The upper part of the floating clamping blocks is slidably connected to a U-shaped ring fixed to the bottom surface of the upper clamping plate, so that the floating clamping blocks can only translate radially along the three-dimensional coiled iron core. A clamping cavity is formed between the inner inclined surface and the outer vertical surface of the floating clamping blocks. In the free state, the radial width of the clamping cavity is less than the radial thickness of the upper yoke of the three-dimensional coiled iron core. When the upper clamping plate moves downward, the upper yoke of the three-dimensional coiled iron core is embedded in the clamping cavity, and the inner inclined surface of the upper yoke of the three-dimensional coiled iron core abuts against the inclined surface of the floating clamping blocks, pushing the floating clamping blocks to expand radially outward. A two-way clamping is formed from the inner and outer sides of the upper yoke of the three-dimensional coiled iron core through the inner inclined surface and the outer vertical surface. A second rubber damping pad is provided on the clamping surface where the floating clamping blocks contact the upper yoke of the three-dimensional coiled iron core.

[0012] Furthermore, a third rubber vibration damping pad is provided between the lower clamping plate and the bottom surface inside the oil tank housing.

[0013] Furthermore, a vibration sensor is fixedly installed on the upper yoke of the three-dimensional coiled iron core. The vibration sensor and the adjusting motor are both electrically connected to the controller. The controller is configured with closed-loop adjustment logic and controls the operation of the adjusting motor according to the vibration signal collected by the vibration sensor to dynamically adjust the position of the upper clamping plate to optimize the clamping force of the three-dimensional coiled iron core and suppress magnetostrictive vibration noise.

[0014] Furthermore, a support base is provided at the bottom of the oil tank housing, and a fourth rubber vibration damping pad is provided between the support base and the bottom surface of the oil tank housing.

[0015] The beneficial effects of this invention include: by adjusting the forward or reverse rotation of the ball screw driven by the motor, and cooperating with the threaded transmission of the nut pair to drive the upper clamping plate to make micron-level lifting and lowering displacement in the vertical direction, the axial clamping force of the upper clamping plate on the three-dimensional coiled iron core can be precisely and in real time adjusted to adapt to the periodic magnetostrictive deformation characteristics of the transformer under different load conditions, reduce the slippage and vibration friction between iron core layers, and achieve active vibration reduction and noise reduction effect. This solves the industry pain points of traditional transformers with fixed clamping force, inability to adapt to the working conditions in real time during operation, and large vibration and noise. Attached Figure Description

[0016] Figure 1 This is an exploded view of the three-dimensional wound core transformer in an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the transformer body in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the damping rod after the cylinder barrel has been cut in an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the coil clamping frame in an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the upper and lower clamping plates holding the three-dimensional coiled iron core in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the bottom surface of the upper clamping plate in an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the floating clamping block in an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the floating clamping block and the U-shaped limiting block clamping the three-dimensional coiled iron core on the yoke in an embodiment of the present invention.

[0024] Figure reference numerals: 1 Transformer body; 2 Oil tank housing; 3 Three-dimensional wound iron core; 4 Coil winding; 5 Upper clamping plate; 6 Lower clamping plate; 7 Ball screw; 8 Adjusting motor; 9 Nut pair; 10 Tie rod; 11 Coil clamping frame; 12 Clamping ring; 13 Clamping spring; 14 Damping rod; 15 Cylinder; 16 Piston rod; 17 Piston; 18 Oil compensation hole; 19 Throttling hole; 20 Guide bar; 21 Guide groove; 22 U-shaped limit block; 23 Clamping nut; 24 First rubber vibration damping pad; 25 Floating clamping block; 26 U-shaped ring; 27 Clamping cavity; 28 Second rubber vibration damping pad; 29 Third rubber vibration damping pad; 30 Vibration sensor; 31 Support seat; 32 Fourth rubber vibration damping pad; 33 High voltage outlet bushing; 34 Low voltage outlet bushing; 35 Pressure relief valve; 36 No-excitation tap changer; 37 Heat dissipation fins; 38 Cooling fan. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects of the embodiments of the present invention clearer, the present invention 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 invention and are not intended to limit the present invention.

[0026] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.

[0027] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified. Example 1

[0029] Please see Figures 1 to 8This invention discloses a three-dimensional wound core transformer with high vibration reduction and noise reduction performance, including a transformer body 1 and an oil tank shell 2. The transformer body 1 is integrally disposed inside the oil tank shell 2. The transformer body 1 includes a three-dimensional wound core 3, coil windings 4 sleeved on the outer side of the column of the three-dimensional wound core 3, and upper clamping plates 5 and lower clamping plates 6 respectively clamping the upper and lower yoke end faces of the three-dimensional wound core 3. Conventional standard components such as high voltage outlet bushings 33, low voltage outlet bushings 34, pressure relief valves 35, and no-excitation tap changers 36 are arranged on the top cover of the oil tank shell 2. Heat dissipation fins 37 and cooling fans 38 are arranged on the side walls of the oil tank shell 2 for heat dissipation during transformer operation to ensure stable overall operating temperature. A ball screw 7 is vertically installed at the center of the transformer body 1. The ball screw 7 passes through the bottom surface of the upper clamping plate 5, the lower clamping plate 6, and the oil tank shell 2. The bottom end of the ball screw 7 located on the outside of the oil tank shell 2 is connected to an adjusting motor 8. A nut pair 9 that is fixed on the upper clamping plate 5 and connected to the ball screw 7 is fixed. Several sets of tie rods 10 are evenly and symmetrically arranged on the outer periphery of the upper clamping plate 5 and the lower clamping plate 6. Each set of tie rods 10 has a clamping nut 23 at the upper and lower ends. During assembly, the tie rods 10 are first locked with the clamping nuts 23 at both ends to form a stable basic axial preload on the three-dimensional wound iron core 3 by the upper clamping plate 5 and the lower clamping plate 6. Then, during the operation of the transformer, the ball screw 7 is driven to rotate by the adjusting motor 8, which drives the upper clamping plate 5 to move vertically to adjust the axial clamping force on the three-dimensional wound iron core 3 in real time. Specifically, the adjusting motor 8 is a servo motor, which can precisely adjust the displacement stroke of the upper clamping plate 5 to adjust the axial clamping force on the three-dimensional coiled iron core 3. A vibration sensor 30 is fixed on the upper yoke of the three-dimensional coiled iron core 3. Both the vibration sensor 30 and the adjusting motor 8 are electrically connected to the controller (not shown in the figure). The controller is a PLC or a microcontroller. The controller is configured with closed-loop adjustment logic. According to the vibration signal collected by the vibration sensor 30, the controller controls the action of the adjusting motor 8 to dynamically adjust the position of the upper clamping plate 5 to optimize the clamping force of the three-dimensional coiled iron core 3 and suppress magnetostrictive vibration noise. The ball screw 7 extends through the bottom side of the oil tank housing 2 into the inner cavity of the housing, and is successively interposed at the center positions of the lower clamping plate 6 and the upper clamping plate 5. The ball screw 7 adopts an axial limiting installation method. Corresponding bearings and bearings are provided on the bottom surface of the oil tank housing 2 and the gap position of the lower clamping plate 6 for support and limiting, so that the ball screw 7 can only rotate around its own axis and does not produce vertical displacement. At the same time, a rotary seal is provided at the gap position where the ball screw 7 passes through the bottom surface of the oil tank housing 2 to prevent the insulating oil inside the oil tank housing 2 from leaking out.

[0030] In this embodiment, by adjusting the motor 8 to drive the ball screw 7 to rotate in the forward or reverse direction, and cooperating with the thread transmission of the nut pair 9 to drive the upper clamping plate 5 to make micron-level lifting and lowering displacement in the vertical direction, under the existing basic pre-tightening state of the upper clamping plate 5 and the lower clamping plate 6, the axial clamping force of the upper clamping plate 5 on the three-dimensional coiled iron core 3 is precisely finely adjusted to adapt to the periodic magnetostrictive deformation characteristics of the transformer under different load conditions, reduce the slippage and vibration friction between iron core layers, and achieve active vibration reduction and noise reduction effect. This solves the industry pain points of traditional transformers with fixed clamping force, inability to adjust in real time according to the operating conditions during operation, and large vibration and noise. Example 2

[0031] To suppress the vibration and noise generated by the coil winding 4 under electromagnetic force and further improve the vibration reduction and noise reduction performance of the transformer, this embodiment adds a coil adaptive clamping and damping vibration reduction structure based on embodiment 1. This is achieved by adding coil clamping frames 11 at both the upper and lower ends of the coil winding 4. The coil clamping frames 11 are pushed and moved in opposite directions by clamping springs 13 to clamp the upper and lower ends of the coil winding 4. See details... Figures 2 to 4 Two sets of coil clamping frames 11 are fitted on the three-dimensional coil core 3, with corresponding upper and lower coil clamping frames 11. Each corner of the coil clamping frame 11 is provided with a clamping ring 12. The two sets of coil clamping frames 11 are flexibly clamped to the upper and lower end faces of the coil winding 4 by the corresponding clamping ring 12, so as to realize the all-round limiting constraint of the coil winding 4. The outer pull rod 10 is installed through the middle of the corresponding coil clamping frame 11. A clamping spring 13 is respectively sleeved on the outer periphery of both ends of the pull rod 10. The bottom end of the upper clamping spring 13 abuts against the upper surface of the coil clamping frame 11, and the top end abuts against the bottom surface of the corresponding upper clamping plate 5 (or against the bottom surface of the pull rod connecting ear provided on the outer side wall of the upper clamping plate 5). The bottom end of the lower clamping spring 13 abuts against the lower clamping plate 6 (or against the upper surface of the pull rod connecting ear provided on the outer side wall of the lower clamping plate 6), and the top end abuts against the lower surface of the corresponding coil clamping frame 11. A damping rod 14 is vertically connected between the two sets of coil clamping frames 11. Relying on the elastic preload thrust of the upper and lower sets of clamping springs 13, the two sets of coil clamping frames 11 are driven to always face each other and press against the end face of the coil winding 4. The damping characteristics of the damping rod 14 are used to effectively limit the axial movement and micro-vibration of the coil winding 4, preventing the coil from loosening, interlayer friction, and resonance noise due to long-term alternating electromagnetic force. Specifically, the damping rod 14 includes a cylinder 15 and a piston rod 16. A piston 17 is fixedly connected to one end of the piston rod 16 inside the cylinder 15. The piston 17 is precisely clearance-fitted with the inner wall of the cylinder 15, dividing the inner cavity of the cylinder 15 into an independent upper cavity and a lower cavity. Oil compensation holes 18, which communicate with the inside of the oil tank housing 2, are respectively opened at both ends of the cylinder 15 corresponding to the upper and lower cavities, ensuring that the inside of the cylinder 15 is always filled with transformer insulating oil. A throttling hole 19, connecting the upper and lower cavities of the cylinder 15, is opened on the piston 17.

[0032] When the coil winding 4 generates high-frequency axial vibration, it will cause the two sets of coil clamping frames 11 to move relative to each other, thereby driving the piston rod 16 and piston 17 to slide back and forth rapidly in the cylinder 15. During the rapid movement of the piston 17, an alternating instantaneous pressure difference is generated in the upper and lower cavities of the cylinder 15. Although the upper and lower cavities can be connected to the oil chamber inside the oil tank shell 2 through the oil compensation holes 18 at both ends to form an indirect flow bypass across the oil tank, the flow path is long and the fluid transmission has a hysteresis effect, making it difficult to respond to the short-term pressure pulsation generated by high-frequency vibration. Therefore, during the vibration, some of the insulating oil in the cylinder 15 flows back and forth between the upper and lower cavities through the throttling hole 19 on the piston 17. Relying on the throttling effect of the small hole, the mechanical energy of the vibration is dissipated, and the alternating vibration amplitude of the coil winding 4 is greatly attenuated, so as to achieve the effect of rapid vibration attenuation and suppression of continuous resonance amplification, and further optimize the noise reduction performance of the transformer. Meanwhile, the damping rod 14 directly uses the insulating oil inside the tank shell 2 as the damping medium, without the need for an additional independent sealed hydraulic oil chamber, effectively avoiding the risk of long-term leakage of external hydraulic medium into the transformer insulating oil, which could lead to a decrease in insulation performance. Example 3

[0033] To prevent circumferential deflection and torsional offset during the lifting and lowering adjustment of the upper clamping plate 5, and to improve the stability of the transformer adjustment clamping force, this embodiment adds a guide limiting structure based on embodiment 2. See details... Figure 1 and Figure 2 A guide bar 20 is vertically provided on the inner wall of the tank housing 2, and guide grooves 21 corresponding to the positions of the guide bar 20 are provided on the side walls of the upper clamping plate 5 and the lower clamping plate 6. The structure of this embodiment is adapted to the assembly process of hoisting the transformer body 1 as a whole. During the process of hoisting the transformer body 1 from above the tank housing 2 into the inner cavity, the guide bar 20 on the inner wall of the housing can slide into the guide grooves 21 corresponding to the upper clamping plate 5 and the lower clamping plate 6 at the same time. This plays a role in accurately guiding and preventing deviation during the overall descent of the transformer body, effectively avoiding collisions with the coil winding 4 during the hoisting process and improving the assembly accuracy. Moreover, after the transformer is assembled, the lower clamping plate 6 remains stationary against the bottom of the oil tank housing 2, while the upper clamping plate 5 undergoes slight vertical displacement adjustment under the drive of the ball screw 7. At this time, the upper clamping plate 5 achieves continuous guidance and limitation through the sliding cooperation between the guide groove 21 and the guide bar 20, restricting the circumferential rotation and radial sway of the upper clamping plate 5, ensuring that the upper clamping plate 5 always maintains vertical and stable lifting and lowering, effectively avoiding the problems of uneven clamping force, fine adjustment accuracy deviation and local stress concentration caused by the torsional offset of the upper clamping plate 5. Example 4

[0034] To further enhance the vibration reduction effect, this embodiment adds a multi-level limiting and positioning and composite vibration reduction structure based on embodiment 3. By combining limiting and clamping of the three-dimensional wound core 3, elastic adaptive fitting, and multi-layer buffering vibration reduction, the vibration transmission path of the three-dimensional wound core 3 is further weakened, comprehensively improving the overall vibration reduction and noise reduction effect of the transformer. See details. Figure 1 , Figure 2 as well as Figures 6 to 8 Several U-shaped limiting blocks 22 are respectively provided on the upper clamping plate 5 and the lower clamping plate 6. The upper and lower yokes of the three-dimensional coiled iron core 3 are respectively inserted into the U-shaped limiting blocks 22. The U-shaped limiting blocks 22 radially limit the upper and lower yokes of the three-dimensional coiled iron core 3 to prevent radial displacement of the iron core during operation. In order to further reduce the rigid contact vibration transmission between the three-dimensional coiled iron core 3 and the U-shaped limiting blocks 22, a first rubber vibration damping pad 24 is fixed on the inner wall of each U-shaped limiting block 22. The flexible buffer structure absorbs the small vibrations of the three-dimensional coiled iron core 3 and avoids secondary noise and vibration caused by rigid metal collision.

[0035] Furthermore, since the vibration of the three-dimensional coiled iron core 3 is mainly concentrated at the upper yoke position, several floating clamping blocks 25 are provided on the bottom surface of the upper clamping plate 5. The floating clamping blocks 25 are integrated elastic metal cantilever structures with high overall structural strength and elastic adaptive deformation capability. The cross-section of the floating clamping block 25 is a right-angled trapezoidal structure with an opening at the bottom. The upper part of the floating clamping block 25 is slidably connected to the U-shaped ring 26 fixed on the bottom surface of the upper clamping plate 5. Through the limiting constraint of the U-shaped ring 26, the floating clamping block 25 can only move radially along the three-dimensional coiled iron core 3 to ensure clamping stability. A clamping cavity 27 is formed between the inner inclined surface and the outer vertical surface of the floating clamping block 25. In a free state without force, the radial width of the clamping cavity 27 is less than the radial thickness of the upper yoke of the three-dimensional coiled iron core 3, ensuring that a pre-clamping allowance can be formed after assembly. When the upper clamping plate 5 moves downward, the upper yoke of the three-dimensional coiled iron core 3 is embedded in the clamping cavity 27, and the inner inclined surface of the upper yoke of the three-dimensional coiled iron core 3 abuts and presses against the inclined surface of the floating clamping block 25. Relying on the guiding effect of the inclined surface, the floating clamping block 25 is pushed to expand and deform radially outward. Through the inner inclined surface and the outer vertical surface, a two-way clamping is formed from both the inner and outer sides of the upper yoke of the three-dimensional coiled iron core 3, effectively restraining the interlayer slippage and micro-vibration of the silicon steel sheets of the upper yoke of the three-dimensional coiled iron core 3. At the same time, a second rubber damping pad 28 is provided on the clamping surface where the floating clamping block 25 contacts the upper yoke of the three-dimensional coiled iron core 3, isolating the rigid metal contact, further absorbing the vibration energy of the three-dimensional coiled iron core 3, and suppressing the outward transmission of vibration. To prevent vibration from being transmitted to the tank housing 2 and external equipment, a third rubber vibration damping pad 29 is provided between the lower clamping plate 6 and the bottom surface of the tank housing 2, which can effectively buffer the vertical vibration generated by the transformer body 1 as a whole. At the same time, a support base 31 is provided at the bottom of the tank housing 2. The support base 31 is used to support the whole machine. A fourth rubber vibration damping pad 32 is provided between the support base 31 and the bottom surface of the tank housing 2, forming the outermost buffer and vibration damping layer of the whole machine. In this embodiment, the first rubber vibration damping pad 24, the second rubber vibration damping pad 28, the third rubber vibration damping pad 29 and the fourth rubber vibration damping pad 32 are all made of oil-resistant and high-temperature resistant nitrile rubber. In this embodiment, the radial vibration energy of the entire three-dimensional wound core 3 is isolated by the U-shaped limiting block 22 in conjunction with the first rubber damping pad 24, the interlayer slippage and micro-vibration of the silicon steel sheets of the three-dimensional wound core 3 are constrained by the floating clamp block 25 in conjunction with the second rubber damping pad 28, the vertical vibration energy of the entire three-dimensional wound core 3 is isolated by the third rubber damping pad 29, and the vibration energy of the whole machine is isolated by the fourth rubber damping pad 32, forming a multi-level composite vibration reduction structure. The vibration energy is consumed and isolated layer by layer, suppressing vibration and noise from the vibration source, transmission path and bottom of the equipment in all aspects, greatly improving the stability and quietness of the transformer during long-term operation.

[0036] The above description provides a further detailed explanation of the present invention in conjunction with specific / preferred embodiments, and it should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the scope of protection of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the scope of protection of the patent application.

Claims

1. A three-dimensional wound core transformer with high vibration reduction and noise reduction performance, comprising a transformer body and an oil tank housing, wherein the transformer body is disposed within the oil tank housing, the transformer body comprising a three-dimensional wound core, coil windings sleeved on the three-dimensional wound core, and upper and lower clamping plates respectively clamping the upper and lower ends of the three-dimensional wound core, characterized in that: A ball screw is vertically mounted at the center of the transformer body. The ball screw passes through the bottom surface of the upper clamping plate, the lower clamping plate, and the oil tank shell. An adjusting motor is connected to the bottom end of the ball screw located on the outside of the oil tank shell. A nut pair that mates with the ball screw is fixedly mounted on the upper clamping plate. Several sets of tie rods are symmetrically arranged on the outer periphery of the upper and lower clamping plates. Clamping nuts are respectively provided at the upper and lower ends of the several sets of tie rods. The adjusting motor drives the ball screw to rotate, thereby causing the upper clamping plate to move vertically to adjust the axial clamping force on the three-dimensional wound iron core.

2. The three-dimensional wound core transformer with high vibration reduction and noise reduction performance according to claim 1, characterized in that: Two sets of coil clamping frames are fitted onto the three-dimensional coil core. Each coil clamping frame has a clamping ring at its corner. The two sets of coil clamping frames are clamped to the upper and lower end faces of the coil winding by the clamping rings. The middle part of the pull rod passes through the coil clamping frame. A clamping spring is fitted on the outer periphery of each end of the pull rod. The bottom end of the upper clamping spring abuts against the upper surface of the coil clamping frame, and the top end abuts against the corresponding upper clamping plate. The bottom end of the lower clamping spring abuts against the lower clamping plate, and the top end abuts against the corresponding lower surface of the coil clamping frame. A damping rod is connected between the two sets of coil clamping frames.

3. The three-dimensional wound core transformer with high vibration reduction and noise reduction performance according to claim 2, characterized in that: The damping rod includes a cylinder and a piston rod. A piston is fixedly connected to one end of the piston rod located inside the cylinder. Oil compensation holes communicating with the inside of the oil tank are respectively opened at both ends of the cylinder. Throttling holes communicating with the two cavities of the cylinder are opened on the piston.

4. The three-dimensional wound core transformer with high vibration reduction and noise reduction performance according to claim 2, characterized in that: The inner wall of the oil tank shell is vertically provided with guide bars, and the side walls of the upper clamping plate and the lower clamping plate are provided with guide grooves corresponding to the positions of the guide bars.

5. The three-dimensional wound core transformer with high vibration reduction and noise reduction performance according to claim 4, characterized in that: The upper clamping plate and the lower clamping plate are respectively provided with a number of U-shaped limiting blocks, and the upper yoke and lower yoke of the three-dimensional coiled iron core are respectively inserted into the U-shaped limiting blocks.

6. The three-dimensional wound core transformer with high vibration reduction and noise reduction performance according to claim 5, characterized in that: The inner wall of the U-shaped limiting block is fixedly provided with a first rubber vibration damping pad.

7. The three-dimensional wound core transformer with high vibration reduction and noise reduction performance according to claim 6, characterized in that: The bottom surface of the upper clamping plate is provided with several floating clamping blocks. The floating clamping blocks are integrated elastic metal cantilever structures with a cross-section of a right-angled trapezoid with an opening at the bottom. The upper part of the floating clamping block is slidably connected to a U-shaped ring fixed to the bottom surface of the upper clamping plate, so that the floating clamping block can only translate radially along the three-dimensional coiled iron core. A clamping cavity is formed between the inner inclined surface and the outer vertical surface of the floating clamping block. In the free state, the radial width of the clamping cavity is less than the radial thickness of the upper yoke of the three-dimensional coiled iron core. When the upper clamping plate moves downward, the upper yoke of the three-dimensional coiled iron core is embedded in the clamping cavity, and the inner inclined surface of the upper yoke of the three-dimensional coiled iron core abuts against the inclined surface of the floating clamping block, pushing the floating clamping block to expand radially outward. A two-way clamping is formed from the inner and outer sides of the upper yoke of the three-dimensional coiled iron core through the inner inclined surface and the outer vertical surface. A second rubber damping pad is provided on the clamping surface where the floating clamping block contacts the upper yoke of the three-dimensional coiled iron core.

8. The three-dimensional wound core transformer with high vibration reduction and noise reduction performance according to claim 7, characterized in that: A third rubber vibration damping pad is provided between the lower clamping plate and the bottom surface inside the oil tank shell.

9. The three-dimensional wound core transformer with high vibration reduction and noise reduction performance according to claim 8, characterized in that: A vibration sensor is fixedly installed on the upper yoke of the three-dimensional coiled iron core. The vibration sensor and the adjusting motor are both electrically connected to the controller. The controller is configured with closed-loop adjustment logic and controls the operation of the adjusting motor according to the vibration signal collected by the vibration sensor to dynamically adjust the position of the upper clamping plate to optimize the clamping force of the three-dimensional coiled iron core and suppress magnetostrictive vibration noise.

10. The three-dimensional wound core transformer with high vibration reduction and noise reduction performance according to claim 9, characterized in that: The bottom of the oil tank housing is provided with a support base, and a fourth rubber vibration damping pad is provided between the support base and the bottom surface of the oil tank housing.

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