Design method of soundproof cover for eliminating low-frequency noise of extra-high voltage transformer

Abstract

The application belongs to the technical field of power equipment noise reduction, and particularly relates to a design method of a sound shield for eliminating low-frequency noise of an extra-high voltage transformer, which comprises a sound shield main body, the sound shield main body is a four-layer composite structure, and from outside to inside, the four-layer composite structure comprises a metal shell, a core barrier sound insulation layer, a high-performance sound absorption layer and a sound elimination layer, the sound elimination layer is composed of a plurality of sound elimination assemblies arranged in an array; a shock pad is arranged at the lower end of the sound shield main body. An air inlet mechanism is arranged at the front end of the sound shield main body and used for introducing external air; an air outlet mechanism is arranged at the upper end of the sound shield main body and used for discharging air in the sound shield main body. The application significantly reduces low-frequency noise through the multi-layer composite structure, maintains efficient ventilation and heat dissipation through automatic cleaning, ensures low-noise operation through an optimized silent exhaust system, and comprehensively improves the noise reduction effect and operation efficiency of the extra-high voltage transformer.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power equipment noise reduction, and particularly relates to a design method of a soundproof cover for eliminating low-frequency noise of an extra-high voltage transformer. BACKGROUND

[0002] To ensure the stable supply of daily life electricity, transformers, as the core equipment of power transmission and distribution systems, are widely used in various fields such as industry, agriculture, transportation and urban communities. In China, there are about 17 million transformers in operation, with a total capacity of about 11 billion kilovolt-amperes. However, the extra-high voltage transformer produces significant low-frequency noise during operation, which not only affects the surrounding environmental quality, but also may adversely affect the health of workers who are long-term exposed to the environment. In order to effectively reduce and eliminate noise, a specially designed protective cover is usually installed outside the transformer. The main function of this protective cover is sound insulation, which can greatly reduce the impact of noise on the surrounding environment.

[0003] The dry transformer sound reduction multifunctional outer cover with the application number CN201220593609.0 has a simple structure, the side wall adopts a three-layer structure, and has good sound insulation effect; it can absorb the noise emitted by the transformer and effectively block the sound propagation through the building; a reinforcing framework is arranged in the side wall to enhance the overall strength of the cover body; and the folding sound reduction sheet of the ventilation window not only has good ventilation effect, but also has sound reduction function, and the fan is automatically opened for heat dissipation function under the condition of temperature rise;

[0004] Since the noise in actual application is mainly generated from two aspects. One is the natural noise generated from the internal mechanical operation process of the equipment. The other is the noise generated from the ventilation process. For example, a filter screen is usually installed at the air inlet of the equipment, which can filter out impurities in the air to ensure air quality. However, when part of the filter holes of the filter screen is blocked, the high-speed flowing air contacts the filter screen, the air flow space is reduced, the flow rate is increased, which causes impact on the filter screen, thereby causing noise.

[0005] Therefore, in actual application, the above-mentioned outer cover is difficult to effectively realize its sound reduction function in the process of use. First of all, it does not have the function of automatically cleaning the dust screen, which leads to the phenomenon that the dust screen is easily blocked in the process of long-term use. Once part of the filter holes of the dust screen is blocked, the air flow space will be correspondingly reduced, which will lead to the increase of flow rate. With the increase of flow rate, the impact on the dust screen will also increase accordingly, and this impact often leads to the generation of noise; secondly, the sound reduction assembly arranged on the outer cover body has a relatively simple structure, which makes it not ideal in eliminating the low-frequency noise generated by the transformer during operation, therefore, the design of the outer cover needs to be further optimized and improved. SUMMARY

[0006] The application aims to provide a design method of a soundproof cover for eliminating low-frequency noise of an extra-high voltage transformer, which can significantly reduce low-frequency noise through a multi-layer composite structure, maintain efficient ventilation and heat dissipation through automatic cleaning, ensure low-noise operation through an optimized silent exhaust system, and comprehensively improve the noise reduction effect and operation efficiency of the extra-high voltage transformer.

[0007] The technical scheme adopted by the application is as follows:

[0008] The design method of the soundproof cover for eliminating low-frequency noise of an extra-high voltage transformer comprises a soundproof cover main body, which is a four-layer composite structure and comprises, from outside to inside, a metal shell, a core barrier sound insulation layer, a high-performance sound absorption layer, and a sound elimination layer.

[0009] A shock pad is arranged at the lower end of the soundproof cover main body and is used to absorb and disperse vibration energy generated during operation of the transformer.

[0010] An air inlet mechanism is arranged at the front end of the soundproof cover main body and is used to introduce external air.

[0011] An air outlet mechanism is arranged at the upper end of the soundproof cover main body and is used to exhaust air inside the soundproof cover main body.

[0012] The air inlet mechanism comprises a shell, which is fixedly embedded on the soundproof cover main body, a dust collection box is connected to the lower end of the shell, and the dust collection box and the shell are in communication with each other, a ventilation part is arranged in the shell, a cleaning part is further arranged in the shell and is used to clean dust on the ventilation part, a dust collection part is arranged at the lower end of the inner cavity of the shell and is used to collect dust cleaned together, and a plurality of abutting parts are arranged in an array on the inner wall of the shell.

[0013] In a preferred scheme, the ventilation part comprises a partition plate, which is fixedly connected to the inside of the shell, a plurality of through holes are arranged in an annular manner on the partition plate, a ventilation cover is rotatably connected to the inner wall of the shell and has a horn shape, a plurality of sound elimination holes are arranged in an array at one end of the ventilation cover, a rotating rod is rotatably connected to the center of the partition plate, one end of the rotating rod is fixedly connected to the ventilation cover, a fan wheel is arranged at the other end of the rotating rod, and a protrusion and a gear ring are arranged at one end of the ventilation cover.

[0014] In a preferred scheme, the cleaning part comprises a support, which is fixedly connected to the inner wall of the shell, a brush roller is rotatably connected to the support, and a small gear wheel is mounted at one end of the brush roller.

[0015] In a preferred scheme, the ash collecting part comprises guide rods, one side of the partition plate is fixedly connected with the guide rods, a plurality of sliding blocks are slidably connected to the guide rods, and the sliding blocks are fixedly connected by support rods, one of the sliding blocks is fixedly connected with a force rod, an arc-shaped scraper is hingedly connected to the sliding block, and a tension spring is connected between the arc-shaped scraper and the sliding block, and a spring is sleeved at the right end of the guide rod.

[0016] In a preferred scheme, the resisting part comprises movable grooves which are arranged on the inner wall of the shell, a resisting block is slidably connected to the inner wall of the movable groove, one end of the resisting block is arc-shaped, and the other end is right-angled, the inner wall of the movable groove is connected with compression springs in an array, and the other end of the compression spring is fixedly connected with the resisting block.

[0017] In a preferred scheme, the air outlet mechanism comprises an air outlet pipe which is fixedly embedded in the upper end of the sound insulation cover body, a mute exhaust fan and a sound elimination disc are installed in the air outlet pipe, the sound elimination disc is located at the upper end of the mute exhaust fan, and a protective cover is fixedly connected to the upper end of the air outlet pipe.

[0018] In a preferred scheme, the sound elimination assembly comprises a mounting block, the mounting block is provided with a sound elimination cavity, an annular rubber ring is fixedly connected between one end of the sound elimination cavity and the mounting block, rubber columns are connected to the other end of the sound elimination cavity in an annular arrangement, the other end of the rubber column is fixedly connected with the inner wall of the mounting block, circular holes are arranged on the sound elimination cavity in an array, the inner wall of the mounting block is provided with protrusions in an array, the protrusions are semispherical and made of rubber.

[0019] In a preferred scheme, the diameter of the circular holes on the sound elimination cavity gradually increases from one hole to the next hole.

[0020] In a preferred scheme, the core barrier sound insulation layer is made of a high-molecular polymer-based composite material.

[0021] In a preferred scheme, the high-performance sound absorption layer is made of glass fiber cotton material, the high-performance sound absorption layer is provided with micropores in an array, the average pore size is set to 0.18mm to 0.22mm, the porosity is greater than 90%, and the thickness of the high-performance sound absorption layer is not less than 50mm.

[0022] The technical effects achieved by the present application are as follows:

[0023] The application optimizes the low-frequency noise generated by the extra-high voltage transformer by designing a four-layer composite structure of the sound insulation cover body, which comprises a metal shell, a core barrier sound insulation layer, a high-performance sound absorption layer and a sound elimination layer. In particular, the high-molecular polymer-based composite material is used as the core barrier sound insulation layer, and the sound elimination assembly designed by introducing the Helmholtz resonance principle in the sound elimination layer, so that the noise in different frequency ranges can be effectively absorbed and weakened, thereby greatly reducing the influence on the surrounding environment and improving the living and working conditions of the surrounding environment.

[0024] The application realizes effective filtration of the air entering from the outside through the ventilation part, the cleaning part and the dust collecting part, and can automatically clean the dust and other impurities on the ventilation path. This not only ensures long-term stable and efficient ventilation and heat dissipation performance, but also avoids the problem of additional noise caused by filter screen blockage, reduces maintenance cost and improves the safety and reliability of equipment operation;

[0025] The air outlet mechanism of the application installs a silent exhaust fan and a sound elimination disc, which not only ensures that the internal heat can be discharged in time to maintain the normal working temperature of the transformer, but also effectively suppresses the secondary noise that may be generated during the exhaust process. In addition, the sound elimination disc is made of sound-absorbing cotton and other materials combined with aerodynamic design, which further enhances the noise reduction effect, so that the entire sound insulation cover can maintain extremely low operating noise level while achieving good heat dissipation. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the whole application;

[0027] Figure 2 is a structural schematic diagram of the air inlet mechanism of the application;

[0028] Figure 3 is a structural schematic diagram of the internal structure of the shell of the application;

[0029] Figure 4 is a right side view of the application; Figure 3

[0030] Figure 5 is a front view of the application; Figure 3

[0031] Figure 6 is a partial structural schematic diagram of the ventilation part of the application;

[0032] Figure 7 is a structural schematic diagram of the cleaning part of the application;

[0033] Figure 8 is a structural schematic diagram of the dust collecting part of the application;

[0034] Figure 9 is a connection schematic diagram of the sliding block and the arc-shaped scraper.​​

[0035] Figure 10 is a sectional view of the shell of the present application;

[0036] Figure 11 is an enlarged schematic view of part A shown in the present application Figure 10

[0037] Figure 12 is a structural schematic view of the air outlet mechanism of the present application;

[0038] Figure 13 is a structural schematic view of the soundproof cover main body of the present application;

[0039] Figure 14 is a structural schematic view of the sound elimination assembly of the present application.

[0040] In the drawings, the components represented by each reference numeral are listed as follows:

[0041] 1, soundproof cover main body; 2, shock pad; 3, air inlet mechanism; 4, air outlet mechanism; 5, sound elimination assembly; 11, metal shell; 12, core barrier soundproof layer; 13, high-performance sound absorption layer; 14, sound elimination layer;

[0042] 31, shell; 32, dust collection box; 33, ventilation part; 34, cleaning part; 35, dust collection part; 36, abutting part;

[0043] 331, partition; 332, through hole; 333, ventilation cover; 334, sound elimination hole; 335, rotating rod; 336, wind wheel; 337, protruding block; 338, gear ring;

[0044] 341, support; 342, brush roller; 343, pinion;

[0045] 351, guide rod; 352, sliding block; 353, force receiving rod; 354, arc-shaped scraper; 355, tension spring; 356, spring;

[0046] 361, movable slot; 362, abutting block; 363, compression spring;

[0047] 401, air outlet pipe; 402, exhaust fan; 403, sound elimination disc; 404, protective cover;

[0048] 501, mounting block; 502, sound elimination cavity; 503, annular rubber ring; 504, rubber column; 505, circular hole; 506, protruding part. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings.

[0050] ​In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0051] Second, the "one embodiment" or "an embodiment" described herein as including a particular implementation as part of the present application can include a variety of features, structures, or characteristics not expressly mentioned that are within the scope of the present application. The foregoing described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0052] Third, the present application is described in relation to block diagrams that functionally illustrate the aspects of the present application. The media player described with these block diagrams can be implemented with either software or hardware, or a combination of both. In actual implementation, the length, width, and depth of the block diagrams should be considered in three-dimensional space.

[0053] Please refer to the accompanying Figures 1 to 14 As shown in the drawings, the embodiment provides a design method of a soundproof cover for eliminating low-frequency noise of an extra-high voltage transformer, which includes a soundproof cover body 1. The soundproof cover body 1 is a four-layer composite structure, and from the outside to the inside, it includes a metal shell 11, a core barrier sound insulation layer 12, a high-performance sound absorption layer 13, and a sound elimination layer 14. The sound elimination layer 14 is composed of a plurality of sound elimination assemblies 5 arranged in an array.

[0054] A shock-absorbing pad 2 is arranged at the lower end of the soundproof cover body 1, which is used to absorb and disperse the vibration energy generated during the operation of the transformer, reduce the transmission of vibration, and thus reduce the noise caused by vibration. The shock-absorbing pad 2 is made of a high-molecular material, has good elasticity and durability, can adapt to temperature changes in different working environments, and ensures long-term stable working performance. In addition, the shock-absorbing pad 2 is closely combined with the soundproof cover body 1, ensuring the optimization of the overall sound insulation effect.

[0055] An air inlet mechanism 3 is arranged at the front end of the soundproof cover body 1, which is used to introduce external air;

[0056] An air outlet mechanism 4 is arranged at the upper end of the soundproof cover body 1, which is used to discharge the air inside the soundproof cover body 1.

[0057] The air inlet mechanism 3 comprises a shell 31 fixedly embedded on the sound insulation cover main body 1, a dust collecting box 32 connected to the lower end of the shell 31, and the dust collecting box 32 and the shell 31 being in communication with each other, a ventilation part 33 arranged in the shell 31, a cleaning part 34 arranged in the shell 31 for cleaning dust on the ventilation part 33, a dust collecting part 35 arranged at the lower end of the inner cavity of the shell 31 for collecting the cleaned dust together, and a plurality of abutting parts 36 arranged in an array on the inner wall of the shell 31.

[0058] The diameters of the circular holes 505 on the sound insulation cavity 502 gradually increase from one hole to the next hole.

[0059] The core barrier sound insulation layer 12 is made of a high polymer polymer-based composite material.

[0060] The high-performance sound absorption layer 13 is made of glass fiber cotton material, a plurality of micropores are arranged in an array on the high-performance sound absorption layer 13, the average pore diameter is set to 0.18mm to 0.22mm, the porosity is greater than 90%, and the thickness of the high-performance sound absorption layer 13 is not less than 50mm.

[0061] The sound insulation assembly 5 comprises a mounting block 501, the inside of the mounting block 501 is provided with a sound insulation cavity 502, an annular rubber ring 503 is fixedly connected between one end of the sound insulation cavity 502 and the mounting block 501, a plurality of rubber columns 504 are annularly connected to the other end of the sound insulation cavity 502, the other ends of the rubber columns 504 are fixedly connected to the inner wall of the mounting block 501, a plurality of circular holes 505 are arranged in an array on the sound insulation cavity 502, a plurality of protruding parts 506 are arranged in an array on the inner wall of the mounting block 501, the protruding parts 506 are semispherical and made of rubber.

[0062] In this embodiment, the outermost metal shell 11 is made of high-strength aluminum alloy material, which has excellent weather resistance and corrosion resistance. Its physical properties, such as elastic modulus and density, help to reduce the impact of external impact, provide physical protection, and prevent external environmental factors such as wind, rain, and ultraviolet light from damaging the internal structure. In addition, this material can reflect part of the external high-frequency noise, reducing the intrusion of noise.

[0063] Secondly, the core barrier sound insulation layer 12 is composed of a high polymer polymer-based composite material, has high density and excellent damping characteristics, can effectively prevent sound waves from penetrating, especially for the low-frequency noise generated by the ultra-high voltage transformer, and ensures excellent sound insulation performance. The main function of this layer is to provide a high acoustic impedance interface, so that the sound wave is reflected at this interface rather than penetrating. In addition, the core barrier sound insulation layer also has good mechanical strength, so as to be able to withstand a certain physical pressure without deformation or damage.

[0064] The high-performance sound-absorbing layer 13 is made of glass fiber cotton material, has a high specific surface area and a fine fiber structure, and can maintain stable sound-absorbing performance under different humidity conditions. The internal porosity and average pore size are optimized (the average pore size is set to 0.18-0.22 mm, and the porosity is above 90%) to enhance the sound-absorbing efficiency in the low-frequency band, capture and absorb sound wave energy, and effectively absorb low-frequency noise.

[0065] The innermost sound-absorbing layer 14 is composed of a plurality of sound-absorbing components 5 arranged in an array form. Sound waves enter through the opening end of the sound-absorbing cavity 502, causing the air column in the cavity to vibrate. Due to air friction, the vibration energy is converted into heat energy and consumed, achieving the sound-absorbing effect. The sound-absorbing cavity 502 is designed with a plurality of circular holes 505, each of which corresponds to an independent small Helmholtz resonator, enhancing the sound-absorbing effect. The diameters of the circular holes 505 gradually increase, and different diameter holes have different resonance frequencies. Small holes resonate high-frequency sound, and large holes resonate low-frequency sound, expanding the frequency response range of the system and effectively processing and controlling noise in a wider frequency range.

[0066] The sound-absorbing cavity 502 is tightly connected to the mounting block 501 through the annular rubber ring 503 and the rubber column 504. This connection is stable and elastic, and is a non-rigid connection. It allows the sound-absorbing cavity 502 to vibrate freely to some extent, which helps to enhance the resonance effect without affecting the safety of the overall structure. The raised portion 506 made of rubber material can further improve the sound-absorbing effect by friction energy dissipation.

[0067] In general, when there is external noise, the metal shell 11 reflects part of the high-frequency noise, reducing the intrusion of noise, and the remaining noise hits the core barrier sound insulation layer 12. Most of the sound energy is reflected, and a small amount of sound energy continues to propagate inward. The sound wave enters the internal sound-absorbing material layer (such as the high-performance sound-absorbing layer 13), which gradually loses energy and is absorbed.

[0068] When there is internal noise, the noise generated by the transformer first passes through two layers of sound-absorbing and attenuating materials, including the sound-absorbing layer 14 and the high-performance sound-absorbing layer 13, significantly reducing the noise level in each frequency range. After pretreatment, the low-frequency noise that is difficult to eliminate reaches the core barrier sound insulation layer 12. Since the residual noise energy has been reduced, the core barrier sound insulation layer 12 only needs to cope with a smaller pressure, effectively blocking the noise from spreading outward, and ensuring optimal noise reduction performance of the system.

[0069] Each layer has a specific function to gradually weaken noise in different frequency ranges, achieving a comprehensive and effective noise reduction effect. The layers are bonded together using environmentally friendly two-component epoxy resin as an adhesive, ensuring firm bonding and not releasing harmful substances to affect environmental quality.

[0070] In summary, the efficient protective cover design can prevent the influence of external noise on the internal equipment, reduce the diffusion of noise generated inside the transformer to the surrounding environment, and achieve the best noise reduction effect.

[0071] Secondly, please refer to Figures 3 to 6 , the ventilation part 33 includes a partition plate 331 fixedly connected to the inside of the shell 31, the partition plate 331 is provided with a through hole 332 in a ring shape, the inner wall of the shell 31 is rotatably connected with a ventilation cover 333, and the ventilation cover 333 is in a horn shape, one end of the ventilation cover 333 is provided with a sound hole 334 in an array distribution, the center of the partition plate 331 is rotatably connected with a rotating rod 335, and one end of the rotating rod 335 is fixedly connected with the ventilation cover 333, the other end of the rotating rod 335 is provided with a fan wheel 336, and one end of the ventilation cover 333 is provided with a lug 337 and a gear ring 338.

[0072] In this embodiment, when dissipating heat, external air enters through the port of the shell 31, then passes through the through hole 332 on the partition plate 331 and the sound hole 334 on the ventilation cover 333 in sequence, enters the inside of the ventilation cover 333, and finally enters the inside of the sound insulation cover main body 1 from the other end of the shell 31.

[0073] It should be noted that: the total hole diameter of the plurality of sound holes 334 is not less than the total hole diameter of the plurality of through holes 332, and the total hole diameter of the plurality of through holes 332 is not less than the hole diameter of the air inlet end of the shell 31; such a design makes the air flow space gradually increase, thereby reducing the air flow rate while ensuring the air intake amount, reducing the impact, and further reducing the generation of noise.

[0074] In addition, in order to ensure the sound reduction effect, the sound holes 334 are uniformly distributed on the ventilation cover 333, and the through holes 332 are located at the air inlet end of the shell 31, so as to ensure the air flow while minimizing the spread of noise.

[0075] Thirdly, please refer to Figure 4 and Figure 7 , the cleaning part 34 includes a support 341 fixedly connected to the inner wall of the shell 31, and a brush roller 342 rotatably connected to the support 341, and a small gear 343 mounted at one end of the brush roller 342.

[0076] In this embodiment, when the external air enters, the wind wheel 336 is rotated by the action of the airflow. The rotation of the wind wheel 336 drives the ventilation cover 333 to rotate. The gear ring 338 provided on the ventilation cover 333 is engaged with the pinion 343 on the brush roller 342, realizing the transmission function, thereby driving the rotation of the brush roller 342. The rotation of the brush roller 342 acts on the ventilation cover 333 to perform the cleaning operation, so as to prevent the noise holes 334 on the ventilation cover 333 from being blocked and ensure the smooth airflow. At the same time, the rotation of the ventilation cover 333 itself can realize the overall cleaning of itself.

[0077] Secondly, please refer to Figures 8 to 10 The dust collecting part 35 includes a guide rod 351, the guide rod 351 is fixedly connected to one side of the partition plate 331, a plurality of sliding blocks 352 are slidingly connected to the guide rod 351, and the plurality of sliding blocks 352 are fixedly connected by a support rod, one of the sliding blocks 352 is fixedly connected with a force rod 353, an arc-shaped scraper 354 is hingedly connected to the sliding block 352, and a tension spring 355 is connected between the arc-shaped scraper 354 and the sliding block 352, and a spring 356 is sleeved on the right end of the guide rod 351.

[0078] Please refer to 10 and Figure 11 The abutting part 36 includes a movable groove 361, the movable groove 361 is arrayed and formed in the inner wall of the shell 31, the movable groove 361 is slidingly connected with an abutting block 362, one end of the abutting block 362 is arc-shaped, and the other end is right-angled, the inner wall of the movable groove 361 is arrayed and connected with a compression spring 363, and the other end of the compression spring 363 is fixedly connected with the abutting block 362.

[0079] In this embodiment, the ventilation cover 333 drives the protruding block 337 to rotate during the rotation process, and the rotation of the protruding block 337 gradually applies a force to the force rod 353, so as to drive the plurality of sliding blocks 352 to move rightward. The rightward movement of the sliding block 352 drives the arc-shaped scraper 354 to move rightward, and through the action of the plurality of arc-shaped scrapers 354, the dust falling in the lower end of the inner cavity of the shell 31 can be pushed to move rightward until the dust is pushed into the dust collecting box 32 for collection. This automatic cleaning mode not only reduces the burden of cleaning dust, but also ensures that the air inlet mechanism 3 maintains good ventilation effect for a long time; and the dust collecting box 32 is provided with a sealing door, which can be opened to pour out the dust in the dust collecting box 32 when the dust needs to be cleaned. In addition, the inner wall of the dust collecting box 32 is coated with an anti-static coating, which can effectively prevent dust from adhering to the inner wall, ensuring that the dust can smoothly fall into the dust collecting box 32.

[0080] Specifically, when the arc-shaped scraper 354 moves to the right, it will be resisted by the slider 352, and the arc-shaped scraper 354 will not be able to rotate. At this time, the arc-shaped scraper 354 will press down on the abutting block 362 during movement and compress the compression spring 363. At this time, the arc-shaped scraper 354 can contact the inner cavity bottom surface of the shell 31, thereby pushing the dust to move. When the arc-shaped scraper 354 moves to the maximum stroke, it will not press the abutting block 362. At this time, the abutting block 362 is driven upward by the reset force of the compression spring 363. When the protrusion 337 is no longer in contact with the force rod 353, the plurality of arc-shaped scrapers 354 are pushed to move left to reset under the reset force of the spring 356. During the reset process, the arc-shaped scraper 354 is resisted by the abutting block 362. At this time, the arc-shaped scraper 354 will rotate along the hinge with the slider 352, and the tension spring 355 will be stretched. At this time, the arc-shaped scraper 354 will not contact the inner cavity bottom surface of the shell 31, thereby not moving the dust. Through this cyclic process, the dust can be continuously pushed to the right, so that the dust is collected in the dust collecting box 32.

[0081] Please refer again to Figure 12 , the air outlet mechanism 4 includes an air outlet pipe 401 fixedly embedded in the upper end of the sound insulation cover main body 1. The air outlet pipe 401 is internally provided with a silent exhaust fan 402 and a sound absorbing disc 403, and the sound absorbing disc 403 is located at the upper end of the silent exhaust fan 402. The upper end of the air outlet pipe 401 is fixedly connected with a protective cover 404.

[0082] In this embodiment, during heat dissipation, the silent exhaust fan 402 is started to draw out the hot air inside the sound insulation cover main body 1. At this time, negative pressure is generated inside the sound insulation cover main body 1, and external air enters the sound insulation cover main body 1 along the air inlet mechanism 3 to achieve the purpose of heat dissipation. The sound absorbing disc 403 is arranged in the air outlet pipe 401, so that when the air is discharged along the air outlet pipe 401, noise will not be generated due to the friction of air flow.

[0083] It should be noted that the sound absorbing disc 403 is selected to have a stainless steel outer steel ring, and a plurality of sound absorbing rings are embedded in the outer steel ring. The sound absorbing rings are made of sound absorbing cotton, and a layer of porous sound absorbing material is covered on the surface of the sound absorbing cotton to enhance the sound absorbing effect. The pore structure of the sound absorbing cotton can effectively disperse and absorb the sound wave energy generated by the air flow, thereby reducing the noise level. In addition, the design of the sound absorbing disc 403 also considers the principle of aerodynamics to ensure the smoothness of the air flow and avoid generating additional air flow noise. In this way, the sound insulation cover can not only effectively reduce the low-frequency noise generated during the operation of the transformer, but also ensure the heat dissipation performance of the equipment and ensure the stable operation of the transformer.

[0084] It should be noted that: the inner wall of the shell 31, the outer surface of the wind wheel 336, the outer surface of the ventilation cover 333, the inner wall of the air outlet pipe 401 and the bottom surface of the protective cover 404 are provided with a composite material coating (such as a coating containing rubber particles or other elastomer components) which can provide additional vibration damping without affecting air flow, helping to reduce noise caused by vibration.

[0085] The working principle of the present application is:

[0086] Four-layer composite sound insulation structure:

[0087] Metal shell 11: The outermost layer is made of high-strength aluminum alloy material, which has weather resistance and corrosion resistance, reflects part of the high-frequency noise, and provides physical protection at the same time.

[0088] Core barrier sound insulation layer 12: made of high-molecular polymer-based composite material, as the main sound wave blocking layer, provides a high acoustic impedance interface, reflects most of the sound energy, especially for low-frequency noise.

[0089] High-performance sound-absorbing layer 13: uses glass fiber cotton material with optimized porosity and micropore distribution, which can efficiently absorb low-frequency sound wave energy and further attenuate the penetrating sound.

[0090] Silencing layer 14: composed of multiple arrayed silencing components 5, each component is designed with a Helmholtz resonator type silencing cavity 502 inside, which converts vibration energy into heat energy through air friction and effectively handles noise in a wide frequency range.

[0091] Cushion 2: set at the lower end of the sound insulation cover body 1, made of high-molecular material, absorbs and disperses the vibration energy generated during the operation of the transformer, reduces the vibration transmission to the sound insulation cover body 1, thereby reducing the secondary noise caused by vibration.

[0092] Intelligent ventilation and cleaning system:

[0093] Air inlet mechanism 3: including shell 31 with dust collection box 32, ventilation part 33 (including wind wheel 336), cleaning part 34 (including brush roller 342) and dust collection part 35. When external air enters, it drives the wind wheel 336 to rotate, and then drives the ventilation cover 333 and the brush roller 342 to rotate, realizing self-cleaning, preventing dust from blocking the silencing hole 334, and ensuring long-term stable ventilation effect.

[0094] Air outlet mechanism 4: contains a silent exhaust fan 402 and a silencing disc 403. When the silent exhaust fan 402 is started to extract internal hot air, negative pressure is generated to make external air flow into the air inlet mechanism 3, while the silencing disc 403 uses its special structure and sound-absorbing material to reduce noise during the exhaust process.

[0095] The above merely describes the preferred embodiments of the present application, and it should be pointed out that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application. The structures, devices and operation methods not specifically described and explained in the present application are implemented according to the conventional means in the art, unless specifically described and limited.

Claims

1. A design method of a soundproof cover for eliminating low-frequency noise of an extra-high voltage transformer, characterized by comprising the following steps: The utility model relates to a sound insulation cover body (1) is four layer composite structure, from outside to inside is metal shell (11) successively, core barrier sound insulation layer (12), high -performance sound absorption layer (13) and sound elimination layer (14), sound elimination layer (14) is composed of multiple array distribution sound elimination subassembly (5), ​ The shock pad (2) is arranged at the lower end of the sound insulation cover body (1) and is used for absorbing and dispersing the vibration energy generated during the operation of the transformer, The air inlet mechanism (3) is arranged at the front end of the sound insulation cover body (1) and is used for introducing external air, The air outlet mechanism (4) is arranged at the upper end of the sound insulation cover body (1) and is used for discharging the air inside the sound insulation cover body (1), The air inlet mechanism (3) includes a shell (31) fixedly embedded on the sound insulation cover body (1), a dust collecting box (32) connected to the lower end of the shell (31), and the dust collecting box (32) and the shell (31) are in communication, a ventilation part (33) arranged in the shell (31), a cleaning part (34) arranged in the shell (31) for cleaning the dust on the ventilation part (33), a dust collecting part (35) arranged at the lower end of the inner cavity of the shell (31) for collecting the cleaned dust, and a plurality of abutting parts (36) arranged in an array on the inner wall of the shell (31); The ventilation part (33) includes a partition plate (331) fixedly connected to the inside of the shell (31), a plurality of through holes (332) arranged in a ring on the partition plate (331), a ventilation cover (333) rotatably connected to the inner wall of the shell (31) and in a horn shape, a plurality of sound elimination holes (334) arranged in an array at one end of the ventilation cover (333), a rotating rod (335) rotatably connected to the center of the partition plate (331) and fixedly connected to one end of the ventilation cover (333), a fan wheel (336) arranged at the other end of the rotating rod (335), and a lug (337) and a gear ring (338) arranged at one end of the ventilation cover (333); The cleaning part (34) includes a support (341) fixedly connected to the inner wall of the shell (31), and a brush roller (342) rotatably connected to the support (341), and a small gear (343) mounted at one end of the brush roller (342); The dust collecting part (35) includes a guide rod (351) fixedly connected to one side of the partition plate (331), a plurality of sliding blocks (352) slidably connected to the guide rod (351), a plurality of sliding blocks (352) fixedly connected by a support rod, one of the sliding blocks (352) fixedly connected to a stress rod (353), an arc-shaped scraper (354) hinged to the sliding block (352) and connected to the sliding block (352) by a tension spring (355), and a spring (356) sleeved to the right end of the guide rod (351); The abutting part (36) comprises movable grooves (361) which are arranged on the inner wall of the shell (31), the inner wall of the movable groove (361) is slidably connected with an abutting block (362), one end of the abutting block (362) is arc-shaped, the other end is right-angled, the inner wall of the movable groove (361) is connected with compression springs (363) which are arranged in an array, and the other end of the compression spring (363) is fixedly connected with the abutting block (362).

2. The design method of the sound shield for eliminating low-frequency noise of an extra-high voltage transformer according to claim 1, characterized in that: The air outlet mechanism (4) comprises an air outlet pipe (401) which is fixedly embedded in the upper end of the sound insulation cover body (1), the air outlet pipe (401) is internally provided with a mute exhaust fan (402) and a sound elimination disc (403), the sound elimination disc (403) is located at the upper end of the mute exhaust fan (402), and the air outlet pipe (401) is fixedly connected with a protective cover (404) at the upper end.

3. The design method of the sound shield for eliminating low-frequency noise of the UHV transformer according to claim 1, characterized in that: The sound elimination assembly (5) comprises a mounting block (501), the mounting block (501) is internally provided with a sound elimination cavity (502), the sound elimination cavity (502) is fixedly connected with an annular rubber ring (503) between one end and the mounting block (501), the other end of the sound elimination cavity (502) is connected with rubber columns (504) which are arranged in an annular shape, the other end of the rubber column (504) is fixedly connected with the inner wall of the mounting block (501), the sound elimination cavity (502) is provided with circular holes (505) which are arranged in an array, the inner wall of the mounting block (501) is provided with protruding parts (506) which are arranged in an array, the protruding part (506) is semispherical and made of rubber.

4. The design method of the sound shield for eliminating low-frequency noise of an extra-high voltage transformer according to claim 3, characterized in that: The diameter of the circular hole (505) on the sound elimination cavity (502) gradually increases from one hole to the next hole.

5. The design method of the sound shield for eliminating low-frequency noise of an extra-high voltage transformer according to claim 1, characterized in that: The core barrier sound insulation layer (12) is made of a high polymer polymer composite material.

6. The design method of the sound shield for eliminating low-frequency noise of an extra-high voltage transformer according to claim 1, characterized in that: The high-performance sound absorption layer (13) is made of glass fiber cotton material, the high-performance sound absorption layer (13) is provided with micropores which are arranged in an array, the average pore size is set to 0.18mm to 0.22mm, the porosity is more than 90%, and the thickness of the high-performance sound absorption layer (13) is not less than 50mm.

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