A large capacity transformer structure matched with a Chinese box transformer

Abstract

The utility model relates to transformer technical field, specifically disclose a big capacity transformer structure of Chinese style box transformer is matched, including oil tank and the base located below oil tank, the inner wall of oil tank is provided with sound shield, the sound shield includes the damping composite board and gradient sound absorption layer from inside to outside, the damping composite board includes steel sheet, viscoelastic layer and microporous constraint layer from inside to outside in proper order, through the sound shield and bottom multistage damping shock absorber of oil tank inner wall integration, form the double -path control of vibration and noise, the noise radiation of transformer body and the solid noise of through foundation propagation are reduced significantly, effectively solve the reverberation sound field problem in the closed Chinese style box transformer, the compact multilayer composite sound shield design realizes excellent noise reduction effect in limited space, has overcome the contradiction of big volume of conventional sound shield, top cooling fin design ensures the necessary heat dissipation performance while maintaining noise reduction.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and specifically discloses a structure for a large-capacity transformer used in conjunction with a Chinese-style box-type substation. Background Technology

[0002] In recent years, with the accelerated transformation of urban power grids, Chinese-style prefabricated substations have been widely used in sensitive areas such as residential areas and commercial centers due to their compact structure and flexible deployment. As the core equipment, the large-capacity transformers they support have increasingly highlighted the noise pollution problem they generate during operation. Research shows that transformer noise is mainly caused by the magnetostrictive vibration of the iron core and the electromagnetic force of the windings, and is amplified through radiation from the tank wall, forming a reverberant sound field within the enclosed space of the prefabricated substation.

[0003] In existing technologies, conventional soundproof enclosures require a relatively large thickness to ensure noise reduction, which conflicts with the limited installation space of Chinese-style prefabricated substations. The vibration of the transformer's own oil tank generates noise, which is quite loud, pollutes the environment, and harms human health. Utility Model Content

[0004] This utility model proposes a structure for a large-capacity transformer used in a Chinese-style prefabricated substation. By integrating a soundproof cover on the inner wall of the oil tank and a multi-stage damping and vibration reduction device at the bottom, it forms a dual-path control for vibration and noise, significantly reducing the noise radiation of the transformer body and the solid noise propagating through the foundation, effectively solving the problem of reverberation sound field in the enclosed Chinese-style prefabricated substation.

[0005] This utility model is implemented as follows: a large-capacity transformer structure for use with a Chinese-style box-type substation includes an oil tank and a base located below the oil tank. The inner wall of the oil tank is provided with a sound insulation cover. The sound insulation cover includes a damping composite plate and a gradient sound-absorbing layer from the inside out. The damping composite plate includes a steel plate, a viscoelastic layer and a microporous constraint layer from the inside out. The steel plate, viscoelastic layer and microporous constraint layer are hot-pressed together. The gradient sound-absorbing layer includes three layers of glass wool. A micro-perforated aluminum plate is fixedly connected to the outer wall of the outermost glass wool.

[0006] Multiple damping shock absorbers are installed between the oil tank and the base.

[0007] As a preferred embodiment of the structure of a large-capacity transformer for use with a Chinese-style box-type substation, two guide telescopic rods are fixedly connected between the oil tank and the base. An elastic sheet is fixedly connected between the fixed sections of the two guide telescopic rods. The elastic sheet has an arc-shaped structure. A pressure rod is fixedly connected to the center of the bottom of the oil tank. A rotating wheel that abuts against the elastic sheet is rotatably connected to the bottom end of the pressure rod.

[0008] As a preferred embodiment of the structure of a large-capacity transformer for use with a Chinese-style box-type substation, the steel plate has a thickness of 0.8-1.2mm, the viscoelastic layer is butyl rubber with a thickness of 1.8-2.2mm, and the microporous constraint layer is calcium silicate board with a thickness of 1.5-1.8mm and a pore diameter of 0.3-0.5mm.

[0009] As a preferred structure for a large-capacity transformer used in conjunction with a Chinese-style box-type substation, the thickness and density of the three layers of glass wool increase sequentially from the inside to the outside.

[0010] As a preferred embodiment of the structure of a large-capacity transformer for use with a Chinese-style box-type substation, the elastic sheet is an alloy steel spring steel plate.

[0011] As a preferred embodiment of the structure of a large-capacity transformer for use with a Chinese-style box-type substation, the top of the oil tank is provided with heat dissipation fins.

[0012] The beneficial effects of this utility model are:

[0013] This structure integrates a soundproof enclosure on the inner wall of the oil tank and a multi-stage damping and vibration reduction device at the bottom, forming a dual-path control for vibration and noise. This significantly reduces the noise radiation from the transformer body and solid noise propagating through the foundation, effectively solving the problem of reverberation sound field in enclosed Hua-style box-type transformers. The compact multi-layer composite soundproof enclosure design achieves excellent noise reduction within a limited space, overcoming the contradiction of the large size of conventional soundproof enclosures. The top heat dissipation fin design ensures that noise reduction is achieved while maintaining necessary heat dissipation performance. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0015] Figure 1 This is the overall main view of the present invention;

[0016] Figure 2 This is a top sectional view of the fuel tank structure of this utility model;

[0017] Figure 3 This is a cross-sectional structural diagram of the damping composite plate of this utility model;

[0018] Figure 4 This is a cross-sectional structural diagram of the gradient sound-absorbing layer of this utility model.

[0019] The markings in the diagram are: 1. Oil tank; 2. Base; 3. Damping composite plate; 4. Gradient sound absorption layer; 5. Steel plate; 6. Viscoelastic layer; 7. Microporous constraint layer; 8. Glass wool; 9. Micro-perforated aluminum plate; 10. Damping shock absorber; 11. Guide telescopic rod; 12. Elastic sheet; 13. Rotary wheel; 14. Heat dissipation fins. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0021] Please see Figure 1-4 A large-capacity transformer structure for use with a Chinese-style box-type substation includes an oil tank 1 and a base 2 located below the oil tank 1. The inner wall of the oil tank 1 is provided with a sound insulation cover. The sound insulation cover includes a damping composite plate 3 and a gradient sound-absorbing layer 4 from the inside to the outside. The damping composite plate 3 includes a steel plate 5, a viscoelastic layer 6 and a microporous constraint layer 7 from the inside to the outside. The steel plate 5, the viscoelastic layer 6 and the microporous constraint layer 7 are hot-pressed together. The gradient sound-absorbing layer 4 includes three layers of glass wool 8. A micro-perforated aluminum plate 9 is fixedly connected to the outer wall of the outermost glass wool 8.

[0022] Multiple damping shock absorbers 10 are installed between the oil tank 1 and the base 2.

[0023] In this embodiment: a soundproof cover is installed on the inner wall of the oil tank 1. Its damping composite plate 3 is formed by hot-pressing an inner steel plate 5, a middle viscoelastic layer 6, and an outer microporous constraint layer 7. The steel plate 5 provides basic strength and transmits vibration. The viscoelastic layer 6 converts the mechanical energy of vibration into heat energy through shear deformation. The microporous constraint layer 7 further dissipates sound energy through microporous friction and acoustic impedance conversion. The damping composite plate 3 is covered with a gradient sound-absorbing layer 4, which includes three layers of glass wool 8 with increasing thickness and density from the inside to the outside. This matches different frequency bands of sound waves to achieve wideband and high-efficiency sound absorption. The outermost micro-perforated aluminum plate 9 strengthens the sound absorption through the pore resonance sound absorption mechanism. High-frequency noise control is implemented; multiple damping shock absorbers 10 are installed between the oil tank 1 and the base 2, which absorb and isolate the transmission of vibration of the transformer core and windings to the foundation through the deformation of high damping materials; the roller 13 at the bottom of the center pressure rod at the bottom of the oil tank 1 presses on the arc-shaped alloy steel elastic sheet 12 connected between the fixed sections of the two guide telescopic rods 11. The guide telescopic rods 11 restrict the horizontal displacement of the oil tank, and the vertical vibration of the oil tank forces the roller 13 to roll and press the elastic sheet 12 to produce elastic bending deformation, converting the vibration kinetic energy into elastic potential energy and dissipating it partially; heat dissipation fins 14 are set on the top of the oil tank 1 to ensure that the heat dissipation performance is not affected while reducing noise.

[0024] As a technical optimization of this utility model, two guide telescopic rods 11 are fixedly connected between the oil tank 1 and the base 2. An elastic sheet 12 is fixedly connected between the fixed sections of the two guide telescopic rods 11. The elastic sheet 12 has an arc-shaped structure. A pressure rod is fixedly connected to the bottom center of the oil tank 1. A rotating wheel 13 that abuts against the elastic sheet 12 is rotatably connected to the bottom end of the pressure rod.

[0025] In this embodiment: the two guide telescopic rods 11 mainly restrict the horizontal displacement of the oil tank 1, ensuring that its movement is basically vertical. When the oil tank 1 vibrates vertically, the arc-shaped elastic plate 12 connecting the fixed sections of the two rods is pressed by the pressure rod and the rotating wheel 13 at its bottom, resulting in elastic bending deformation. This deformation process absorbs the vibration kinetic energy (converting it into elastic potential energy), and consumes some energy through internal material friction and rolling friction of the rotating wheel 13, providing an additional vertical vibration attenuation path and enhancing the vibration reduction effect.

[0026] As a technical optimization of this utility model, the steel plate 5 has a thickness of 0.8-1.2mm, the viscoelastic layer 6 is butyl rubber with a thickness of 1.8-2.2mm, and the microporous constraint layer 7 is calcium silicate board with a thickness of 1.5-1.8mm and a pore diameter of 0.3-0.5mm.

[0027] In this embodiment: the steel plate 5 is 0.8-1.2mm thick to balance the structural stiffness and vibration transmission efficiency; the viscoelastic layer 6 is made of butyl rubber to optimize its damping energy dissipation performance; the microporous constraint layer 7 is made of calcium silicate board to ensure its constraint damping effect and optimize the frictional dissipation effect of micropores on mid-to-high frequency sound waves.

[0028] As a technical optimization of this utility model, the thickness and density of the three-layer glass wool 8 increase sequentially from the inside to the outside.

[0029] In this embodiment, the thickness and density of the three-layer glass wool 8 increase from the inside to the outside, so that the change in its acoustic impedance gradient can be smoothly transitioned to the external space, reducing sound reflection, and absorbing low-frequency, mid-frequency and high-frequency noise more effectively in sequence, thereby improving the sound insulation effect.

[0030] As a technical optimization of this utility model, the elastic sheet 12 is an alloy steel spring steel plate.

[0031] In this embodiment, the elastic sheet 12 is made of alloy steel spring steel plate to ensure that it has excellent elasticity, fatigue strength and sufficient stiffness, and can reliably withstand repeated bending deformation and provide continuous vibration reduction effect.

[0032] As a technical optimization of this utility model, the top of the oil tank 1 is provided with heat dissipation fins 14.

[0033] In this embodiment: heat dissipation fins 14 are provided on the top of the oil tank 1 to increase the contact area between the oil tank and the air for heat dissipation.

[0034] The working principle and usage process of this utility model: When the transformer is running, the vibration generated by the magnetostriction of the iron core and the electromagnetic force of the winding is transmitted to the wall of the oil tank 1 through the internal structure. The vibration energy of the wall of the oil tank 1 first acts on the steel plate 5 of the inner damping composite plate 3. The vibration of the steel plate 5 forces the middle viscoelastic layer 6 to undergo significant reciprocating shear deformation. This deformation process converts a large amount of vibration mechanical energy into heat energy. At the same time, the deformation of the viscoelastic layer 6 drives the outer microporous constraint layer 7 to vibrate. The air in the micropores inside it generates a violent friction and viscosity effect, further consuming sound energy and changing the sound impedance. The residual sound waves that penetrate the damping composite plate 3 enter the gradient sound-absorbing layer 4. When the sound waves propagate in the gaps between the porous three-layer glass wool 8 fibers, the sound energy is continuously converted into air energy due to the friction between the air and the fibers and the viscosity between air molecules. The design of the three-layer glass wool 8 with increasing thickness and density optimizes the absorption efficiency of sound waves in different frequency bands; some of the sound waves reaching the outermost micro-perforated aluminum plate 9 excite the resonance effect of its micropores and the cavity behind it, generating strong air friction to consume high-frequency sound energy; at the same time, the overall mechanical vibration of the oil tank 1 is greatly absorbed and attenuated by the damping shock absorber 10 connected to its bottom, significantly blocking the transmission path of vibration to the base 2 and foundation; the vertical vibration of the oil tank 1 also drives the pressure rod and the rotating wheel 13 at the center of its bottom to press down on the arc-shaped elastic plate 12 connected between the fixed sections of the two guide telescopic rods 11, forcing the elastic plate 12 to undergo elastic bending deformation. This deformation process absorbs the vibration kinetic energy, while the guide telescopic rods 11 constrain the horizontal movement of the oil tank 1; the heat generated by the oil tank 1 is effectively dissipated through the top heat dissipation fins 14.

[0035] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., 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 this utility model 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 this utility model.

[0036] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A large-capacity transformer structure for a Chinese box transformer set, comprising an oil tank (1) and a base (2) located below the oil tank (1), characterized in that: The inner wall of the oil tank (1) is provided with a sound insulation cover, which comprises a damping composite board (3) and a gradient sound absorption layer (4) from inside to outside, the damping composite board (3) comprises a steel plate (5), a viscoelastic layer (6) and a microporous constraint layer (7) from inside to outside in turn, the steel plate (5), the viscoelastic layer (6) and the microporous constraint layer (7) are hot-pressed and combined, the gradient sound absorption layer (4) comprises three layers of glass wool (8), and the outer wall of the glass wool (8) in the outermost layer is fixedly connected with a microporous aluminum plate (9). A plurality of damping shock absorbers (10) are installed between the oil tank (1) and the base (2).

2. A large capacity transformer structure for a Chinese box transformer set according to claim 1, characterized in that: Two guide telescopic rods (11) are fixedly connected between the oil tank (1) and the base (2), an elastic sheet (12) is fixedly connected between the fixed segments of the two guide telescopic rods (11), the elastic sheet (12) is in an arc-shaped structure, a pressure rod is fixedly connected to the bottom center of the oil tank (1), and a rotating wheel (13) abutting against the elastic sheet (12) is rotatably connected to the bottom end of the pressure rod.

3. A large capacity transformer structure for a Chinese box transformer set according to claim 1, characterized in that: The thickness of the steel plate (5) is 0.8-1.2mm, the viscoelastic layer (6) is butyl rubber, the thickness is 1.8-2.2mm, the microporous constraint layer (7) is calcium silicate board, the thickness is 1.5-1.8mm, and the pore size is 0.3-0.5mm.

4. A large capacity transformer structure for a Chinese box transformer set according to claim 1, characterized in that: The thickness and density of the three layers of glass wool (8) are increased from inside to outside in turn.

5. A large capacity transformer structure for a Chinese box transformer set according to claim 2, characterized in that: The elastic sheet (12) is an alloy steel spring steel plate.

6. A large capacity transformer structure for a Chinese box transformer set according to claim 1, characterized in that: The top of the oil tank (1) is provided with a heat dissipation fin (14).

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