Transformer noise reduction device

Abstract

The application provides a transformer noise reduction device, and relates to the technical field of transformers. The transformer noise reduction device is composed of a base, a top cover and a plurality of noise reduction plate assemblies. The noise reduction plate assembly comprises a shell, a plurality of fixing cylinders and a plurality of sound-absorbing plates. The plurality of shells are vertically arranged on the base in a head-to-tail mode. The top cover is arranged on the plurality of shells. The top cover, the base and the plurality of shells form an accommodating cavity. The accommodating cavity is used for accommodating the transformer installed on the base. In a single noise reduction plate assembly, the plurality of fixing cylinders are vertically arranged in the shell in a length direction of the shell. The plurality of sound-absorbing plates are vertically arranged in the plurality of fixing cylinders. Each sound-absorbing plate spirally extends around the central axis of the corresponding fixing cylinder. The opposite outer side walls of any two adjacent fixing cylinders and the opposite two inner side walls of the shell in the thickness direction form a resonance cavity. Based on the above, the application realizes double noise reduction (i.e. the resonance cavity and the sound-absorbing plate in the spiral form) of the transformer, and the noise reduction effect is better.

Description

Technical Field

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

[0002] A transformer is a static electrical device in a power distribution system that transforms alternating voltage / current to transmit alternating current based on the law of electromagnetic induction. Transformers convert high-voltage electrical energy into usable low-voltage electrical energy to meet the needs of various electrical devices. Typically, a transformer consists of a primary coil, a secondary coil, and an iron core. When an alternating voltage is applied to the primary winding, the alternating current generates an alternating magnetic flux. When this magnetic flux passes through the secondary winding, it induces an electromotive force (EMF). If the secondary winding is connected to electrical equipment, a current is generated, thus achieving energy transfer.

[0003] In related technologies, the core of a transformer is made up of several stacked silicon steel sheets. When the transformer is running, the change in alternating magnetic flux causes these stacked silicon steel sheets to vibrate at least 50 times per second, thus producing a "humming" sound. As the transformer runs for longer, this "humming" sound becomes louder and louder, especially at night, which greatly affects the normal life of nearby residents. In order to alleviate the noise problem of the transformer, conventional noise reduction structures such as sound-absorbing cotton are usually used to surround the transformer. Although this approach can reduce the noise of the transformer during operation to a certain extent, its noise reduction effect is still not good. Summary of the Invention

[0004] This application provides a transformer noise reduction device, which aims to solve the problem in the related technology that transformers are prone to generating noise during operation, and that conventional noise reduction structures such as sound-absorbing cotton have limited noise reduction effects.

[0005] To address the aforementioned drawbacks in related technologies, this application provides a transformer noise reduction device, comprising a base, a top cover, and multiple noise reduction plate assemblies. The multiple noise reduction plate assemblies are erected on the base with their ends connected to the ground, and the top cover is placed on the multiple noise reduction plate assemblies. The top cover, the base, and the multiple noise reduction plate assemblies enclose a receiving cavity for accommodating a transformer installed on the base. The noise reduction plate assembly includes a housing, multiple fixed cylinders, and multiple sound-absorbing plates. The housing is erected on the base, and the multiple fixed cylinders are erected at intervals along the length of the housing within the housing. The multiple sound-absorbing plates are respectively erected in the multiple fixed cylinders, and each sound-absorbing plate extends spirally around the central axis of the corresponding fixed cylinder. The outer sidewalls of any two adjacent fixed cylinders facing each other enclose the two inner sidewalls of the housing facing each other in the thickness direction to form a resonant cavity.

[0006] In some implementation schemes, the housing includes a main housing and an auxiliary housing. The main housing is erected on a base, and the auxiliary housing is erected inside the main housing. Multiple fixed cylinders are erected at intervals along the length of the auxiliary housing. The outer side walls of any two adjacent fixed cylinders are enclosed by the two inner side walls of the auxiliary housing in the thickness direction to form a resonant cavity. The two outer side walls of the main housing in the length direction each have an inwardly recessed main positioning groove, and the two inner side walls of the main housing in the length direction each have a corresponding main positioning boss that matches the main positioning groove. The two outer side walls of the auxiliary housing in the length direction each have an inwardly recessed auxiliary positioning groove, and the two inner side walls of the auxiliary housing in the length direction each have a corresponding auxiliary positioning boss that matches the auxiliary positioning groove. The two main positioning bosses are respectively inserted into the two auxiliary positioning grooves.

[0007] In some implementations, the main shell includes a front shell plate, a rear shell plate, and two cover plates. The front and rear shell plates are erected on a base, facing each other and spaced apart. The front shell plate has front extension plates extending towards the rear shell plate on both opposite sides along its length. Each of the two front extension plates has an inwardly recessed first main positioning groove on its opposing sidewalls. Each of the two front extension plates also has a corresponding first main positioning boss on its opposing sidewalls, adapted to the first main positioning groove. The rear shell plate has rear extension plates extending towards the front shell plate on both opposite sides along its length. Each of the two rear extension plates has a corresponding... The second main positioning groove is recessed inward. The two rear extension plates have corresponding second main positioning bosses that are adapted to the second main positioning groove on their opposite side walls. The two front extension plates are respectively attached to the two rear extension plates. The two first main positioning bosses are respectively inserted into the two second main positioning grooves. The two second main positioning bosses are respectively inserted into the two auxiliary positioning grooves. The front shell plate, the rear shell plate, the two front extension plates and the two rear extension plates surround to form a cavity. The auxiliary shell is erected in the cavity. The cavity has two main shell openings that are opposite each other in the height direction of the main shell. Two cover plates are respectively covered at the two main shell openings to close the cavity.

[0008] In some implementations, the auxiliary shell has two auxiliary shell openings that are opposite each other in the height direction. A sound-absorbing material layer is attached to the opposing surfaces of the two cover plates. The two opposite ends of the sound-absorbing material layer are formed with slots that are adapted to the ends of the auxiliary positioning bosses. The sound-absorbing material layer is used to: cover the corresponding auxiliary shell opening when the cover plate is placed on the main shell opening, and to allow the ends of the two auxiliary positioning bosses to be inserted into the two slots respectively.

[0009] In some implementation schemes, the transformer noise reduction device includes, in addition to the above-mentioned structure, multiple flexible columns and multiple transition columns. The flexible columns are erected on the base and are located between two adjacent noise reduction plate assemblies with the same length direction. The flexible columns have two positioning ribs that extend along their own height direction and are opposite to each other. The two positioning ribs are respectively inserted into the two main positioning slots of the two main shells with the same length direction and are adjacent. The transition columns are erected on the base and are located between two adjacent noise reduction plate assemblies with the vertical length direction. The transition columns have two positioning strips that extend along their own height direction and are vertical. The two positioning strips are respectively inserted into the two main positioning slots of the two main shells with the vertical length direction and are adjacent.

[0010] In some implementations, the top cover has multiple positioning blocks on the side facing the base, each corresponding to a plurality of adapter posts, and the multiple positioning blocks are respectively inserted into the ends of the plurality of adapter posts.

[0011] In some implementations, the transformer noise reduction device, in addition to the aforementioned structure, also includes two internal heat dissipation components and two external heat dissipation components. The two internal heat dissipation components are located within the receiving cavity, with one end attached to opposite sides of the transformer, and the other end extending towards the top cover. One end of each of the two external heat dissipation components is positioned opposite each other and spaced apart on the top cover, extending into the receiving cavity. The ends of the two external heat dissipation components within the receiving cavity are in contact with the two internal heat dissipation components. Specifically, the internal heat dissipation components transfer the heat generated during transformer operation to the external heat dissipation components; the external heat dissipation components dissipate the heat to the outside space.

[0012] In some implementations, the internal heat dissipation assembly includes a heat sink, an internal heat spreader, heat pipes, and an internal heat conduction base. The heat sink is attached to one side of the transformer, the internal heat spreader is placed on the heat sink, one end of the heat pipe is placed on the internal heat spreader and the other end extends towards the top cover, the internal heat conduction base is placed on the end of the heat pipe near the top cover, and an internal heat transfer layer is attached to the internal heat conduction base. The internal heat transfer layer contacts the end of the external heat dissipation assembly that extends into the receiving cavity. Further, the external heat dissipation assembly includes an external heat conduction base, an external heat spreader, and two heat pipe assemblies. The external heat conduction base is placed on the top cover and extends into the receiving cavity to contact the internal heat transfer layer. An external heat transfer layer is attached to the external heat conduction base, the external heat spreader is placed on the external heat transfer layer, and the two heat pipe assemblies are both placed on the external heat spreader and located at opposite ends of the external heat spreader. Each heat pipe assembly includes multiple heat pipes arranged side-by-side and several fins stacked and sleeved on the multiple heat pipes.

[0013] In some implementations, the external heat dissipation assembly includes, in addition to the structure described above, a cooling fan mounted on the external heat spreader and located between the two heat pipe assemblies.

[0014] The transformer noise reduction device provided in this application consists of a base, a top cover, and multiple noise reduction plate assemblies. Each noise reduction plate assembly includes a housing, multiple fixed cylinders, and multiple sound-absorbing plates. Multiple housings are erected on the base with their ends connected. The top cover is placed on the multiple housings. The top cover, the base, and the multiple housings enclose a receiving cavity for accommodating a transformer installed on the base. For a single noise reduction plate assembly, multiple fixed cylinders are erected at intervals along the length of the housing inside the housing. Multiple sound-absorbing plates are erected in the multiple fixed cylinders respectively. Each sound-absorbing plate extends spirally around the central axis of the corresponding fixed cylinder. The outer side walls of any two adjacent fixed cylinders facing each other enclose the two inner side walls of the housing facing each other in the thickness direction to form a resonant cavity. Understandably, the transformer is surrounded by multiple noise-reducing panel assemblies. Some of the noise generated during transformer operation is reflected back by the casing, while the rest enters the casing and subsequently the various fixed cylinders and resonant cavities. Because the sound-absorbing panels inside the fixed cylinders are spiral-shaped, they guide the noise to reflect continuously within themselves, thus extending the sound wave propagation path and dissipating its energy, ultimately reducing noise. After the noise enters the resonant cavity, the air molecules within vibrate back and forth in different directions to generate resonance. At resonance, the amplitude of the air molecules in the resonant cavity is at its maximum, causing most of the sound wave energy to be converted into heat energy, further reducing noise. Therefore, compared to conventional noise reduction structures such as sound-absorbing cotton used in traditional solutions, the transformer noise reduction device of this application achieves dual noise reduction (i.e., resonant cavity and spiral-shaped sound-absorbing panels), resulting in better noise reduction performance. Attached Figure Description

[0015] To more clearly illustrate the related technologies or the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the related technologies or the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application, and not all embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the transformer noise reduction device provided in the embodiments of this application; Figure 2 This is a cross-sectional view of the transformer noise reduction device provided in the embodiments of this application; Figure 3 A cross-sectional view of the noise reduction plate assembly provided in an embodiment of this application; Figure 4 An exploded view of the noise reduction plate assembly provided in the embodiments of this application; Figure 5 Provided for the embodiments of this application Figure 4 A magnified view of a section at point A in the middle; Figure 6Provided for the embodiments of this application Figure 4 A magnified view of a section at point B in the middle; Figure 7 Provided for the embodiments of this application Figure 4 A magnified view of a section at point C; Figure 8 Provided for the embodiments of this application Figure 4 A magnified view of a section at point D; Figure 9 This is an exploded view of the transformer noise reduction device provided in the embodiments of this application; Figure 10 Provided for the embodiments of this application Figure 9 A magnified view of a section at point E in the middle; Figure 11 Provided for the embodiments of this application Figure 9 A magnified view of a section at point F in the middle; Figure 12 Provided for the embodiments of this application Figure 9 A magnified view of a section at point G.

[0017] The markings in the above diagrams represent: 1-base, 2-top cover, 3-noise reduction panel assembly, 4-receiving cavity, 5-shell, 6-fixed cylinder, 7-sound-absorbing panel, 8-resonant cavity, 9-flexible column, 10-adapter column, 11-internal heat dissipation assembly, 12-external heat dissipation assembly, 21-positioning block, 51-main shell, 52-auxiliary shell, 511-main positioning groove, 512-main positioning boss, 513-front shell plate, 514-rear shell plate, 515-cover plate, 516-front extension plate, 517-rear extension plate, 518-sound-absorbing material layer, 5161-first main positioning block. 5162-First main positioning boss, 5171-Second main positioning groove, 5172-Second main positioning boss, 5181-Card slot, 521-Auxiliary positioning groove, 522-Auxiliary positioning boss, 91-Positioning rib, 101-Positioning strip, 111-Heat dissipation plate, 112-Inner heat spreader, 113-Heat pipe, 114-Inner heat spreader, 115-Inner heat transfer layer, 121-Outer heat spreader, 122-Outer heat transfer layer, 123-Outer heat spreader, 124-Heat dissipation pipe assembly, 125-Heat dissipation fan, 126-Fin, 1241-Heat pipe. Detailed Implementation

[0018] In related technologies, the core of a transformer is composed of stacked silicon steel sheets. During transformer operation, changes in alternating magnetic flux cause these stacked silicon steel sheets to vibrate at least 50 times per second, producing a "humming" sound. This "humming" sound increases with the transformer's operating time, becoming particularly severe at night, significantly impacting the normal lives of nearby residents. To alleviate transformer noise, conventional noise reduction structures such as sound-absorbing cotton are typically used to surround the transformer. While this approach can reduce noise to some extent, its noise reduction effect is still unsatisfactory. Furthermore, it restricts the transformer's heat dissipation capacity, preventing the large amount of heat generated during operation from being dissipated effectively and promptly. This causes the transformer's temperature to rise, negatively impacting its insulation performance and operational stability, and potentially even leading to safety accidents. In addition, using conventional noise reduction structures like sound-absorbing cotton to surround the transformer often involves complex assembly methods such as bolts. Therefore, when maintenance is required, workers must spend considerable time and effort disassembling and reassembling these noise reduction structures, increasing maintenance costs and potentially causing safety hazards or even damaging the transformer due to improper operation. In view of this, the present application proposes a transformer noise reduction device in the embodiments below to solve the above-mentioned drawbacks in the related art.

[0019] To make the objectives, technical solutions, and advantages of this application more apparent and understandable, this application will be clearly and completely described below in conjunction with its embodiments and corresponding drawings. Throughout, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. It should be understood that the embodiments of this application described below are only for explaining this application and are not intended to limit this application. That is, all other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0020] Please see Figures 1 to 5 , Figure 1 This is a structural schematic diagram of a transformer noise reduction device. Figure 2 This is a cross-sectional view of a transformer noise reduction device. Figure 3 This is a cross-sectional view of the noise reduction panel assembly. Figure 4 This is an exploded view of the noise reduction panel assembly. Figure 5 yes Figure 4A partial enlarged view at point A. This embodiment provides a transformer noise reduction device, which includes a base 1, a top cover 2, and multiple noise reduction plate assemblies 3. The base 1 is used to install the transformer. The multiple noise reduction plate assemblies 3 are erected on the base 1 with their ends connected to the ground (i.e., vertically set) and surround the transformer. The top cover 2 covers the multiple noise reduction plate assemblies 3. The top cover 2, the base 1, and the multiple noise reduction plate assemblies 3 together form a receiving cavity 4 to accommodate the transformer installed on the base 1. Specifically, the noise reduction panel assembly 3 includes a housing 5, multiple fixed cylinders 6, and multiple sound-absorbing panels 7. The housing 5 is erected on the base 1. The multiple fixed cylinders 6 are erected at intervals along the length x of the housing 5 inside the housing 5. The multiple sound-absorbing panels 7 are erected in the multiple fixed cylinders 6 respectively. Each sound-absorbing panel 7 extends spirally around the central axis of the corresponding fixed cylinder 6. The outer sidewalls of any two adjacent fixed cylinders 6 and the two inner sidewalls of the housing 5 in the thickness / width y direction enclose each other to form a resonant cavity 8. That is, there is a resonant cavity 8 between every two adjacent fixed cylinders 6 in a single noise reduction panel assembly 3. In addition, it should be noted that the shape and size of the resonant cavity 8 can be designed according to actual needs, such as based on the vibration frequency of 50 times per second of the silicon steel sheets of the transformer core.

[0021] Understandably, the transformer is surrounded by multiple noise reduction plate assemblies 3. Part of the noise generated during transformer operation is reflected back by the housing 5, while the other part enters the housing 5 and then enters each fixed cylinder 6 and resonant cavity 8. After the noise enters the fixed cylinder 6, since the sound-absorbing plate 7 inside the fixed cylinder 6 is spiral in shape (i.e., spirally extending around the central axis of the fixed cylinder 6), the sound-absorbing plate 7 guides the noise to reflect continuously inside itself, thereby lengthening the propagation path of the sound wave, consuming the energy of the sound wave, and ultimately reducing the noise. After the noise enters the resonant cavity 8, the air molecules in the resonant cavity 8 will vibrate back and forth in different directions to generate resonance. When resonating, the amplitude of the air molecules in the resonant cavity 8 is the largest, so that most of the energy of the sound wave is converted into heat energy, which further reduces the noise.

[0022] In this embodiment, the housing 5, the fixing cylinder 6, and the sound-absorbing plate 7 are all formed by bending ultra-microperforated aluminum plates to ensure their sound absorption performance. It should be noted that ultra-microperforated aluminum plates are a new type of sound-absorbing material. Their surface is covered with a large number of micropores with a diameter less than 1 mm (e.g., 0.1~0.5 mm), and the perforation rate is generally controlled at 1~5%. Compared with traditional perforated plates, ultra-microperforated aluminum plates have the following significant advantages: First, they have a wide sound absorption bandwidth, especially for mid-to-low frequency noise, because the air damping of the ultra-micropores is greater, which can more effectively convert sound wave energy into heat energy; second, they have high structural strength, as the aluminum plate itself has high mechanical strength and rigidity, capable of withstanding certain impacts and loads, making them suitable as structural components for noise reduction devices; third, they have good fire resistance, as aluminum plates are non-combustible materials, meeting the stringent fire safety requirements of electrical equipment; fourth, they have excellent corrosion resistance, as the surface can be anodized, sprayed, or treated with anti-corrosion agents, adapting to harsh outdoor environmental conditions; and fifth, their smooth and flat surface does not easily accumulate dust, making them easy to clean. For example, the housing 5, the fixing cylinder 6 and the sound-absorbing plate 7 are all made of ultra-micro-perforated aluminum plate with a thickness of 1.5~2.0mm, bent into shape, with a pore diameter of 0.3mm and a perforation rate of 3%; the ultra-micro-perforated aluminum plate with these parameters has the best absorption effect on noise in the 100~1000Hz frequency band, which covers the main frequency range of transformer noise.

[0023] In this embodiment, the helix angle of the spiral-shaped sound-absorbing panel 7 is a key design parameter, which directly affects the propagation path length and reflection number of sound waves within the fixed cylinder 6. For example, the helix angle of the sound-absorbing panel 7 is designed to be 15~30°, preferably 20°. Experiments have verified that when the helix angle of the sound-absorbing panel 7 is 20°, the propagation path length of the sound waves within the fixed cylinder 6 is approximately three times the height of the fixed cylinder 6. That is, for a fixed cylinder 6 with a height of 2m, the propagation path length of the sound waves can reach 6m. This significantly increases the contact time and contact area between the sound waves and the surface of the sound-absorbing panel 7, thereby more fully consuming the sound wave energy. If the helix angle of the sound-absorbing panel 7 is too small (e.g., less than 15°), although the propagation path of the sound waves within the fixed cylinder 6 is longer, it will lead to excessive airflow resistance within the fixed cylinder 6, which is not conducive to heat dissipation. If the helix angle of the sound-absorbing panel 7 is too large (e.g., greater than 30°), the propagation path of the sound waves within the fixed cylinder 6 will be too short, and the sound absorption effect will significantly decrease.

[0024] In this embodiment, the surface of the sound-absorbing panel 7 can be roughened, for example, by forming a tiny uneven structure on its surface through processes such as sandblasting or etching, or by attaching a thin layer of sound-absorbing non-woven fabric to its surface. This can further increase the diffuse reflection of sound waves and improve the sound absorption effect. Diffuse reflection of sound waves is relative to specular reflection. When sound waves are incident on a smooth and flat panel surface, specular reflection occurs, and the direction of the reflected sound waves is fixed, easily propagating directly along the channel, resulting in insufficient sound energy consumption. However, when the panel surface has an uneven structure with a wavelength comparable to that of the sound waves, the sound waves will diffusely reflect in all directions. The reflected sound waves will form chaotic interference and superposition within the channel, increasing the residence time and number of reflections of the sound waves within the channel, thereby improving the efficiency of sound energy consumption. It should be noted that the roughening treatment should not be excessive, otherwise it will lead to excessive airflow resistance and affect heat dissipation.

[0025] As can be seen from the above, compared with conventional noise reduction structures such as sound-absorbing cotton used in traditional solutions, the transformer noise reduction device in this embodiment achieves triple noise reduction (i.e., the reflection of noise by the shell 5, the extension of the sound wave propagation path by the spiral sound-absorbing plate 7, and the conversion of sound wave energy by the resonant cavity 8), resulting in better noise reduction effect. In addition, the transformer noise reduction device in this embodiment also has a self-cleaning function: since the shell 5, the fixed cylinder 6, and the sound-absorbing plate 7 are all made of smooth microporous aluminum plate bent into shape, the surface is not easy to accumulate dust. Moreover, when the sound wave is reflected inside the spiral sound-absorbing plate 7, a certain airflow disturbance is generated, which can blow off the dust attached to the surface of the sound-absorbing plate 7, preventing the micropores from being blocked by dust, thereby ensuring the long-term stable operation of the transformer noise reduction device. Traditional sound-absorbing cotton structures are prone to dust accumulation, and dust can enter the interior of the sound-absorbing cotton, making it difficult to clean. Over time, the sound absorption performance of the sound-absorbing cotton will decrease significantly, and it may even become a breeding ground for bacteria and mold, affecting the ambient air quality.

[0026] Specifically, in this embodiment, the long-term performance advantages brought by the self-cleaning characteristics of the transformer noise reduction device are significant: According to outdoor equipment operation data in the power industry, after three years of outdoor operation, the sound absorption performance of traditional glass wool sound-absorbing structures can decrease by 30-50% due to dust accumulation and moisture, and the fiber powder will be dispersed with the airflow, causing pollution to the surrounding environment; while the all-metal microporous structure of this embodiment, after 10 years of operation in the same outdoor environment, has a sound absorption performance decrease of no more than 5%, and the micropore blockage rate is less than 2%. It only needs to be washed with a high-pressure water gun once a year to restore all performance. The maintenance cost throughout the entire life cycle is only about 1 / 10 of that of the traditional sound-absorbing cotton solution; at the same time, the all-metal structure does not have the problem of organic material aging and decomposition, does not release volatile organic compounds, fully meets environmental protection requirements, and will not become a breeding ground for mold and pests, and has no negative impact on the ecological environment around the power distribution room.

[0027] In some embodiments, please refer to Figures 1 to 5 The housing 5 includes a main housing 51 and an auxiliary housing 52. The main housing 51 is erected on the base 1, and the auxiliary housing 52 is erected in the main housing 51. Multiple fixed cylinders 6 are erected at intervals along the length x of the auxiliary housing 52. The outer sidewalls of any two adjacent fixed cylinders 6 are surrounded by the two inner sidewalls of the auxiliary housing 52 in the thickness / width y direction to form a resonant cavity 8. Furthermore, the main shell 51 has inwardly recessed main positioning grooves 511 formed on its two opposite outer sidewalls in the length direction x, and main positioning bosses 512 adapted to the main positioning grooves 511 are formed on its two opposite inner sidewalls in the length direction x. The auxiliary shell 52 has inwardly recessed auxiliary positioning grooves 521 formed on its two opposite outer sidewalls in the length direction x, and auxiliary positioning bosses 522 adapted to the auxiliary positioning grooves 521 are formed on its two opposite inner sidewalls in the length direction x. When the auxiliary shell 52 is erected in the main shell 51, the two main positioning bosses 512 are respectively inserted into the two auxiliary positioning grooves 521, so that the main shell 51 and the auxiliary shell 52 are relatively fixed. Furthermore, it should be noted that a recessed main positioning groove 511 is formed on a certain outer side wall of the main shell 51 along the length direction x. The recess is the same as the recess on the corresponding inner side wall. Therefore, a main positioning boss 512 that matches the main positioning groove 511 will inevitably be formed on the corresponding inner side wall due to this recess. Similarly, the formation of the auxiliary positioning groove 521 and the auxiliary positioning boss 522 on the auxiliary shell 52 is also in the same way. This application will not elaborate further on this.

[0028] It is understandable that the double-layer structure design of the shell 5 (main shell 51 + auxiliary shell 52) has at least the following important advantages: First, it improves noise reduction. The double-layer structure forms an "air layer sound insulation structure." When sound waves pass through the auxiliary shell 52 and enter the air layer between the main shell 51 and the auxiliary shell 52, they will undergo multiple reflections and refractions in the air layer, thereby further dissipating the sound wave energy. The sound insulation effect is best when the thickness of the air layer is an odd multiple of 1 / 4 wavelength. Second, it improves structural strength. The double-layer structure has higher bending strength and impact resistance than the single-layer structure. First, it allows for better resistance to external loads such as wind, rain, and snow, extending the service life of the transformer noise reduction device. Second, it facilitates modular production and assembly; the main shell 51 and auxiliary shell 52 can be produced separately and then spliced ​​together using positioning grooves and positioning bosses, eliminating the need for welding or bolt connections, thus greatly improving production efficiency and assembly accuracy. Third, it facilitates maintenance and replacement; if the fixing cylinder 6 or sound-absorbing panel 7 inside the auxiliary shell 52 is damaged, the fixing cylinder 6 or sound-absorbing panel 7 can be replaced simply by pulling the auxiliary shell 52 out of the main shell 51, without disassembling the entire noise reduction panel assembly 3, reducing maintenance costs. For example, the air layer thickness between the main shell 51 and the auxiliary shell 52 is designed to be 50mm, which provides optimal sound insulation for noise around 1700Hz.

[0029] It should be noted that the air layer between the main shell 51 and the auxiliary shell 52 can also be filled with sound-absorbing materials, such as glass wool or rock wool, to further improve the sound insulation effect. However, filling with sound-absorbing materials will increase the weight and cost of the noise reduction panel assembly 3 and will also affect heat dissipation. Therefore, in practical applications, the decision to fill with sound-absorbing materials can be made based on the specific noise reduction and heat dissipation requirements. For applications with high noise reduction requirements, glass wool with a thickness of 20-30mm can be filled; for applications with high heat dissipation requirements, no sound-absorbing materials should be filled, allowing the air layer to dissipate heat naturally through convection.

[0030] From a material performance comparison perspective, centrifugal glass wool and rock wool are the two most commonly used sound-absorbing filling materials. Centrifugal glass wool has finer fibers and lower density, resulting in a 10-15% higher mid-to-high frequency sound absorption coefficient than rock wool at the same thickness. Although it is lighter, its high-temperature resistance is slightly worse, and its long-term operating temperature should not exceed 250℃. Rock wool has better high-temperature resistance, capable of withstanding temperatures above 600℃, and has a higher fire resistance rating. However, its fibers are coarser, its low-frequency sound absorption performance is average, and it is heavier. Since the air temperature around transformers typically does not exceed 80℃, centrifugal glass wool is the preferred filling material. A hydrophobic product should be selected, with a water absorption rate of less than 5%, to avoid moisture absorption, weight gain, and performance degradation in outdoor environments.

[0031] It should also be noted that the main positioning groove 511 and the main positioning boss 512 are integrally formed by stamping. This process has the following advantages: First, it has high production efficiency and is suitable for mass production; second, it has high dimensional accuracy, ensuring tightness of the splicing; third, it has high structural strength, as the stamped main positioning groove 511, main positioning boss 512, and main shell 51 are a single unit, preventing detachment or breakage. For example, the depth of the main positioning groove 511 is designed to be 10-15mm, and the width is designed to be 20-25mm. The dimensions of the main positioning boss 512 are matched with the dimensions of the main positioning groove 511, and an interference fit is used between them, with an interference amount of 0.1-0.2mm. This ensures the firmness of the splicing while facilitating disassembly. Similarly, the auxiliary positioning groove 521 and auxiliary positioning boss 522 are also integrally formed by stamping.

[0032] In this application, the slot-boob used for positioning (e.g., main positioning slot 511 and main positioning boss 512) is essentially a tenon-and-mortise interlocking structure. Besides its positioning function, this tenon-and-mortise interlocking structure also possesses excellent shear and bending mechanical properties. When the noise reduction panel assembly 3 is subjected to lateral wind loads, the contact surfaces of the positioning slot and the positioning boss at the interlocking part will jointly bear the shear force, and the load will be distributed across the entire contact surface. The stress concentration is far lower than that of the point contact form of bolted connections. Therefore, this tenon-and-mortise interlocking structure has stronger wind load resistance. According to structural mechanics simulation calculations, under the same plate thickness, the lateral bending strength of this tenon-and-mortise interlocking structure is about 15% higher than that of the bolted connection structure, and there is no section weakening problem caused by bolt holes, resulting in better structural integrity. Simultaneously, the 0.1~0.2mm interference fit design ensures the tightness of the splicing, preventing sound leakage through gaps, and controls the insertion and extraction forces within a reasonable range. A single person can complete the pull-out replacement of the auxiliary shell 52 without the need for special tools.

[0033] As one example, please refer to Figure 6 and Figure 7 , Figure 6 yes Figure 4 A magnified view of a section at point B. Figure 7 yes Figure 4 A partial enlarged view at point C. The main shell 51 includes a front shell plate 513, a rear shell plate 514, and two cover plates 515. The front shell plate 513 and the rear shell plate 514 are erected on the base 1, facing each other and spaced apart. On opposite sides of the front shell plate 513 in the longitudinal direction x, front extension plates 516 extending towards the rear shell plate 514 are formed. Each of the two front extension plates 516 has an inwardly recessed first main positioning groove 5161 on its opposite sidewalls. Corresponding... A first main positioning boss 5162 adapted to the first main positioning groove 5161 is formed. On both sides of the rear shell plate 514 in the length direction x, there are rear extension plates 517 extending to the front shell plate 513. On the side walls of the two rear extension plates 517 facing away from each other, there are inwardly recessed second main positioning grooves 5171. On the side walls of the two rear extension plates 517 facing each other, there are corresponding second main positioning bosses 5172 adapted to the second main positioning grooves 5171. It is understood that a first main positioning groove 5161 is formed on the side wall of a front extension plate 516 away from another front extension plate 516. The inward indentation is the indentation towards the other front extension plate 516 (or the indentation towards the side wall of the front extension plate 516 near the other front extension plate 516). Therefore, the side wall of the front extension plate 516 near the other front extension plate 516 will inevitably form a first main positioning boss 5162 that matches the first main positioning groove 5161 due to this indentation. Similarly, the formation of the second main positioning groove 5171 and the second main positioning boss 5172 on the rear extension plate 517 is also in the same way. This embodiment will not elaborate on this.

[0034] Understandably, the main shell 51 adopts a split structure design of front shell plate 513 + rear shell plate 514 + two cover plates 515, mainly for ease of production and transportation. Because the length of the noise reduction panel assembly 3 is usually 2~3m, using an integral structure would not only be difficult to produce, but also have high transportation costs and be prone to deformation during transportation. With a split structure, the front shell plate 513, rear shell plate 514 and two cover plates 515 can be produced and transported separately, and then assembled on site, which greatly reduces production and transportation costs.

[0035] In this embodiment, the outer surfaces of both the front shell 513 and the rear shell 514 can be treated with anti-corrosion and / or aesthetic finishes. For example, a layer of polyester powder coating with a thickness of 50-80 μm can be sprayed using an electrostatic spraying process. The color can be selected according to the user's needs, such as gray, green, or blue. Polyester powder coating has excellent weather resistance, corrosion resistance, and abrasion resistance, enabling it to adapt to harsh outdoor environmental conditions and providing a service life of over 15 years. Furthermore, a reflective film can be adhered to the outer surface of the main shell 51 to improve nighttime visibility and prevent collisions with vehicles or pedestrians.

[0036] Corrosion protection of outdoor metal components is crucial for ensuring equipment lifespan. Polyester powder coating is a mainstream outdoor corrosion protection process. Its coating provides complete shielding protection, isolating the metal substrate from moisture, oxygen, and salt corrosion. Typically, a coating thickness of 50-80μm is the industry-optimal range. Below 50μm, the pinhole rate increases, reducing shielding effectiveness; above 80μm, adhesion decreases, leading to peeling and flaking, and increasing coating costs. For coastal areas with high salt spray, a galvanized undercoat can be added before powder coating, employing a dual corrosion protection system of "hot-dip galvanizing + polyester powder coating." This can extend salt spray resistance from 15 years to over 25 years, fully meeting the requirements of harsh coastal environments.

[0037] In this embodiment, the front shell plate 513 and the rear shell plate 514 are joined together, that is, the two front extension plates 516 are respectively attached to the two rear extension plates 517. In this case, the two first main positioning bosses 5162 are respectively inserted into the two second main positioning grooves 5171, so that the front shell plate 513 and the rear shell plate 514 are relatively fixed, and the front shell plate 513, the rear shell plate 514, the two front extension plates 516 and the two rear extension plates 517 form a cavity (not shown). The cavity has two main shell openings (not shown) that are opposite each other in the height direction z of the main shell 51. The auxiliary shell 52 can be erected in the cavity first. At this time, the two second main positioning bosses 5172 are respectively inserted into the two auxiliary positioning grooves 521, so that the front shell plate 513, the rear shell plate 514 and the auxiliary shell 52 are relatively fixed. Then, the two cover plates 515 are respectively placed on the two main shell openings to close the cavity.

[0038] Understandably, the splicing between the front shell 513 and the rear shell 514 adopts a "mortise and tenon joint structure," a traditional woodworking connection method with advantages such as strong connection, accurate positioning, and no need for fasteners. Specifically, the first main positioning boss 5162 is inserted into the second main positioning groove 5171, and the second main positioning boss 5172 is inserted into the auxiliary positioning groove 521. This effectively prevents relative displacement between the front shell 513, the rear shell 514, and the auxiliary shell 52, ensuring that even if the transformer noise reduction device is subjected to strong vibration or impact, it will not easily loosen or fall off. Furthermore, no sealant or rubber sealing strips are used at any of the splicing parts in this application. This is because sealant and rubber sealing strips are prone to aging and have a short service life, generally cracking and falling off after 3 to 5 years, which affects the sealing performance and noise reduction effect of the noise reduction device. The "mortise and tenon structure" itself has good sealing performance, and the splicing surfaces are tightly fitted with very small gaps, generally less than 0.1mm. Sound waves have difficulty propagating through these gaps. When sound waves are incident on the splicing gaps, they will undergo multiple reflections and refractions within the gaps, thereby consuming sound wave energy and further improving the sound insulation effect.

[0039] As one example, please refer to Figure 8 , Figure 8 It shows Figure 4A partial enlarged view at point D. The auxiliary shell 52 has two auxiliary shell openings (not shown) opposite each other in the height direction z. Sound-absorbing material layers 518 are affixed to the opposing surfaces of the two cover plates 515. Each end of the sound-absorbing material layer 518 has a groove 5181 that mates with the end of the auxiliary positioning boss 522. Specifically, the sound-absorbing material layer 518 is used to cover the corresponding auxiliary shell opening when the cover plate 515 is placed over the main shell opening, and to allow the ends of the two auxiliary positioning bosses 522 to be inserted into the two grooves 5181 respectively. In other words, in practical applications, the assembly process of the housing 5 / noise reduction plate assembly 3 is as follows: The two front extension plates 516 are respectively attached to the two rear extension plates 517, and the two first main positioning bosses 5162 are respectively inserted into the two second main positioning slots 5171, so that the front housing plate 513 and the rear housing plate 514 are relatively fixed, forming a cavity; the auxiliary housing 52 is erected in the cavity, and the two second main positioning bosses 5172 are respectively inserted into the two auxiliary positioning slots 521, so that the front housing plate 513, the rear housing plate 514, and the auxiliary housing 52 are relatively fixed; the two... Cover plates 515 are placed over the two main shell openings of the cavity. The ends of two auxiliary positioning protrusions 522 near the base 1 are inserted into the two slots 5181 of the lower sound-absorbing material layer 518, and the ends of the two auxiliary positioning protrusions 522 away from the base 1 are inserted into the two slots 5181 of the upper sound-absorbing material layer 518. This fixes the front shell 513, rear shell 514, auxiliary shell 52, and two cover plates 515 relatively, while the two sound-absorbing material layers 518 located above and below respectively cover the two auxiliary shell openings of the auxiliary shell 52. Preferably, the sound-absorbing material layer 518 is made of sound-absorbing cotton such as polyester fiber, glass fiber, rock wool, or sponge.

[0040] In this embodiment, the main function of the sound-absorbing material layer 518 is to absorb noise leaking from the upper and lower ends of the auxiliary shell 52, while also preventing dust and debris from entering the interior of the auxiliary shell 52. Exemplarily, the sound-absorbing material layer 518 uses high-density polyester fiber sound-absorbing cotton with a thickness of 20-30 mm and a density of 40-60 kg / m³. 3Polyester fiber sound-absorbing cotton has the following advantages: First, it has good sound absorption performance, especially for mid-to-high frequency noise; second, it is environmentally friendly and non-toxic, containing no harmful substances and posing no threat to human health; third, it has good fire resistance, meeting the B1 level flame-retardant standard; fourth, it has good moisture resistance, not easily absorbing water and will not mold or deform due to moisture; fifth, it is lightweight, making it easy to install and replace. Of course, for fully fireproof scenarios where organic sound-absorbing materials are not desired, the 518 sound-absorbing material layer can be replaced with a microporous metal plate structure, such as a 0.8mm thick microporous aluminum plate with a 10mm air layer behind it. This achieves the same end-sound absorption effect and is entirely non-combustible, achieving a fire rating of Class A. Its service life is consistent with the main structure, eliminating the need for regular replacement. It is particularly suitable for enclosed scenarios with extremely high fire resistance requirements, such as underground power distribution rooms and indoor substations.

[0041] It should be noted that the sound-absorbing material layer 518 is a consumable part, and its sound absorption performance will gradually decrease over time, so it needs to be replaced regularly. Typically, the replacement cycle for the sound-absorbing material layer 518 is 3-5 years. When replacing it, simply remove the cover plate 515 from the main shell 51, then peel the old sound-absorbing material layer 518 off the cover plate 515, and then attach the new sound-absorbing material layer 518 to the cover plate 515. The entire replacement process is very simple and quick, requiring no professional tools or skills.

[0042] In this embodiment, the slot 5181 is formed on the sound-absorbing material layer 518 by a die-cutting process. Its size is adapted to the end size of the auxiliary positioning boss 522, and the two adopt an interference fit with an interference amount of 0.5~1.0mm. This ensures that the sound-absorbing material layer 518 can be firmly fixed on the auxiliary positioning boss 522 without displacement or detachment. In addition, the sound-absorbing material layer 518 and the cover plate 515 are bonded together with environmentally friendly hot melt adhesive. Hot melt adhesive has the advantages of high bonding strength, fast curing speed, and environmental friendliness and non-toxicity, making it suitable for bonding sound-absorbing materials to metal plates.

[0043] As can be seen from the above, the noise reduction panel component 3 in this application adopts a boltless splicing design, which not only simplifies and speeds up the assembly process but also makes disassembly extremely convenient, greatly improving the convenience for workers to maintain the transformer and enhancing the practicality and operability of the transformer noise reduction device. Specifically, traditional transformer noise reduction devices are assembled using bolted connections. A typical noise reduction device requires hundreds or even thousands of bolts. Assembling a noise reduction device requires 2-3 workers spending 1-2 days, and disassembly takes even longer. Moreover, bolts are prone to rust, especially in humid outdoor environments, where rusted bolts are difficult to remove, sometimes even requiring destructive methods such as gas cutting. This not only increases maintenance costs but may also damage the noise reduction device itself. In contrast, this application adopts a boltless splicing design, completely solving the drawbacks of traditional bolted connections. A typical noise reduction device can be assembled by only 2 workers in 2-3 hours, and disassembly takes only about 1 hour, greatly improving work efficiency. Furthermore, all splicing parts use direct metal-to-metal contact, which reduces the risk of rust, extends service life, and lowers maintenance costs. In addition, the boltless splicing design of this application has the following advantages: First, it is aesthetically pleasing, with no exposed bolt heads, and has a strong sense of unity; second, it has good sealing performance, with the splicing surfaces tightly fitted without gaps, which can effectively prevent sound wave leakage; third, it has high structural strength, as the "mortise and tenon structure" can evenly distribute the load on the entire structure, improving the overall structural strength and stability.

[0044] Furthermore, the boltless splicing design avoids an acoustic defect that is easily overlooked in traditional solutions—the sound bridge effect. In traditional bolted connection structures, the bolts, as rigid connectors, directly connect the inner and outer layers of the sheet metal. Vibrations are transmitted directly outward through this "sound bridge," significantly weakening the sound insulation effect of the double-layer structure, typically resulting in a 3-5 dB decrease in overall sound insulation. In contrast, the boltless splicing design of this application separates the main shell 51 and the auxiliary shell 52 through an air layer, eliminating the rigid connecting sound bridge. Vibrations can only be transmitted slowly through the air layer, allowing the performance of the double-layer sound insulation structure to be fully utilized. At the same time, the dry friction between the metal splicing surfaces generates a certain amount of structural damping, which can dissipate some vibration energy and further suppress the transmission of solid-borne sound—an advantage that bolted connection structures lack.

[0045] To further enhance the strength of the joints, in certain special applications, such as earthquake-prone or windy areas, a small amount of anaerobic adhesive can be applied to the joints. Anaerobic adhesive is a type of adhesive that cures under anaerobic conditions. It fills the tiny gaps between the joint surfaces, improving bond strength, and also provides rust prevention and sealing. However, excessive amounts of anaerobic adhesive should be avoided, as they can hinder disassembly; generally, only a thin layer is needed on the joint surfaces.

[0046] In some embodiments, please refer to Figure 9 , Figure 10 as well as Figure 11 , Figure 9 This is an exploded view of a transformer noise reduction device. Figure 10 yes Figure 9 A magnified view of a section at point E in the middle. Figure 11 yes Figure 9 A magnified view of a section at point F. In addition to the structure described above, the transformer noise reduction device also includes multiple flexible columns 9 and multiple transition columns 10. The flexible columns 9 are erected on the base 1 and are located between two adjacent noise reduction plate assemblies 3 with the same length direction x. The flexible columns 9 have two positioning ribs 91 extending in opposite directions along their own height direction z. The two positioning ribs 91 are respectively inserted into the two main positioning slots 511 of the two adjacent main shells 51 with the same length direction x, that is, respectively inserted into the two first main positioning slots 5161 of the two adjacent front extension plates 516 with the same length direction x. The transition columns 10 are erected on the base 1 and are located between two adjacent noise reduction plate assemblies 3 with the length direction x perpendicular. The transition columns 10 have two positioning strips 101 extending in the z direction and perpendicular to their own height. The two positioning strips 101 are respectively inserted into the two main positioning slots 511 of the two adjacent main shells 51 with the length direction x perpendicular to their own length, that is, respectively inserted into the two first main positioning slots 5161 of the two adjacent front extension plates 516 with the length direction x perpendicular to their own length. It should be noted that the transformer can be considered as a horizontally placed cuboid. In this case, two adjacent noise reduction plate assemblies 3 with the same x-axis length are either both located on the long side or both on the short side of the transformer, and are joined together by a flexible column 9. Two adjacent noise reduction plate assemblies 3 with perpendicular x-axis lengths are typically located at the corners of the transformer, i.e., one noise reduction plate assembly 3 is located on the long side and the other on the short side, and are joined together by a transition column 10. Preferably, the flexible column 9 is made of materials with excellent elastic properties such as natural rubber, synthetic rubber, or thermoplastic elastomers, so that it can be used for vibration damping and buffering between two adjacent noise reduction plate assemblies 3 with the same x-axis length, preventing the formation of a sound bridge between them.

[0047] Based on this, the top cover 2 has multiple positioning blocks 21 on the side facing the base 1, each corresponding to a plurality of transition posts 10. When the top cover 2 is placed on the plurality of noise reduction plate assemblies 3, the multiple positioning blocks 21 are respectively inserted into the ends of the plurality of transition posts 10, so that the top cover 2 and the plurality of noise reduction plate assemblies 3 are relatively fixed. That is to say, whether it is the end-to-end connection between the plurality of noise reduction plate assemblies 3 or the cover closure between the top cover 2 and the plurality of noise reduction plate assemblies 3, it adopts a boltless splicing design in this application, which not only makes the assembly process simple and quick, but also makes disassembly extremely convenient, greatly improving the convenience of maintenance personnel for transformers and enhancing the practicality and operability of the transformer noise reduction device.

[0048] Understandably, this application uses flexible columns 9 to connect two adjacent noise reduction plate assemblies 3 with the same length direction. The flexible columns 9 have good elasticity and damping properties, effectively isolating vibration transmission between the two noise reduction plate assemblies 3, thus avoiding the formation of sound bridges. The hardness of the flexible columns 9 is a key design parameter; too high a hardness results in insufficient elasticity and poor vibration damping; too low a hardness results in insufficient stiffness, failing to guarantee the firmness of the joint. For example, the flexible columns 9 are made of neoprene rubber with a Shore hardness of 60-70. Neoprene rubber has excellent weather resistance, oil resistance, corrosion resistance, and vibration damping properties, with a service life of over 10 years. Furthermore, the flexible columns 9 and the noise reduction plate assemblies 3 are at the same height, ensuring a flexible connection throughout the entire height direction and avoiding localized rigid contact.

[0049] Of course, in extremely cold environments, ordinary rubber will experience low-temperature embrittlement. In this case, the flexible column 9 can be made of silicone rubber. Silicone rubber has a working temperature range of -60℃ to 200℃, maintains good low-temperature elasticity, and will not experience brittleness or cracking, thus meeting the needs of use in frigid regions. In high-temperature environments, the flexible column 9 can be made of butyl rubber, which has more outstanding high-temperature resistance and aging resistance.

[0050] It should be noted that the adapter column 10 is made of aluminum alloy profile, which has the advantages of being lightweight, high-strength, and corrosion-resistant. The height of the adapter column 10 is also the same as the height of the noise reduction plate assembly 3, which ensures the structural strength and sealing at the corner. The base 1 is made of reinforced concrete with a thickness of 200~300mm. Its dimensions are designed according to the size of the transformer and the number of noise reduction plate assemblies 3. Multiple embedded parts are pre-embedded on the upper surface of the base 1 for fixing the flexible column 9 and the adapter column 10. The embedded parts are made of steel plates and anchor bars. The thickness of the steel plates is 10~15mm, the diameter of the anchor bars is 12~16mm, and the length is 300~400mm. The bottoms of the flexible column 9 and the adapter column 10 are fixedly connected to the embedded parts by bolts, which ensures the stability of the entire noise reduction device. In addition, a layer of rubber damping pad with a thickness of 10~20mm can be laid on the upper surface of the base 1. The rubber damping pad can effectively isolate the vibration of the transformer from being transmitted to the ground, thereby reducing the propagation of solid sound. Furthermore, the rubber damping pad is made of natural rubber with a Shore hardness of 40~50 degrees, which has good damping performance and load-bearing capacity.

[0051] The rubber vibration damping pad at base 1 is a foundation vibration isolation measure and a core means of controlling the propagation of solid-borne noise from the transformer. The transformer's vibration is first transmitted to the concrete foundation through base 1, and then from the concrete foundation to the surrounding soil and building structure, forming low-frequency structural noise. This type of noise has extremely strong penetrating power and cannot be suppressed by airborne sound insulation structures alone. However, by placing a rubber vibration damping pad between the transformer and the concrete foundation, the vibration transmission rate can be significantly reduced, decreasing the vibration energy transmitted to the concrete foundation and ultimately reducing solid-borne structural noise. The natural rubber vibration damping pad, with a Shore hardness of 40-50, combined with the weight of the transformer, can reduce the natural frequency of the vibration isolation system to 8-12Hz. The vibration isolation efficiency for the 100Hz transformer fundamental frequency vibration can reach over 90%, effectively solving the problem of low-frequency resonance in residential buildings caused by transformer vibration.

[0052] Of course, for sensitive locations adjacent to residential buildings, rubber damping pads can be replaced with spring-damped vibration isolators. These are constructed using a combination of steel springs and damping materials, achieving a natural frequency as low as 3-5Hz, resulting in higher vibration isolation efficiency and better suppression of ultra-low frequency vibrations. However, the cost is also relatively higher. Therefore, those skilled in the art can flexibly select between rubber damping pads and spring-damped vibration isolators based on actual noise reduction requirements.

[0053] It should also be noted that the top cover 2 is made of welded steel plate with a thickness of 3~4mm, and its size is compatible with the size of the base 1; the upper surface of the top cover 2 is designed with an arc structure that is high in the middle and low around the edges, which facilitates the flow of rainwater and avoids water accumulation; the edge of the top cover 2 has a downward flange with a height of 50~60mm, which can prevent rainwater from flowing into the cavity 4 from the gap between the top cover 2 and the noise reduction plate assembly 3. The positioning block 21 is made of steel plate with a thickness of 10~15mm. Its size is adapted to the inner cavity size of the end of the adapter post 10. The two are fitted with a clearance of 0.2~0.3mm. This ensures that the top cover 2 can be smoothly placed on the adapter post 10 without significant displacement. The positioning block 21 and the top cover 2 are connected by welding. The welding is firm and will not fall off. A sound-absorbing layer with a thickness of 30~50mm can also be pasted on the lower surface of the top cover 2. This can absorb noise reflected from the direction of the top cover 2 and further improve the noise reduction effect. The sound-absorbing layer is made of high-density glass wool and has a layer of aluminum foil pasted on the surface. The aluminum foil has good reflective properties and can reflect heat back into the cavity 4, preventing the top cover 2 from absorbing too much heat and causing the temperature to rise. In addition, an inspection door can be installed on the top cover 2 to facilitate staff to enter the housing 4 to inspect and maintain the transformer; the inspection door is connected to the top cover 2 by a hinge and is equipped with a door lock to prevent unauthorized personnel from entering; the edges of the inspection door can also be sealed with a "mortise and tenon structure" to ensure noise reduction effect.

[0054] In some embodiments, please refer to Figure 1 and Figure 2In addition to the structure described above, the transformer noise reduction device also includes two internal heat dissipation components 11 and two external heat dissipation components 12. The two internal heat dissipation components 11 are located within the receiving cavity 4. One end of each internal heat dissipation component 11 is attached to opposite sides of the transformer, and the other end extends towards the top cover 2. One end of each external heat dissipation component 12 is positioned opposite to and spaced apart from each other on the top cover 2, extending into the receiving cavity 4. The ends of the external heat dissipation components 12 within the receiving cavity 4 are in contact with the two internal heat dissipation components 11. Specifically, the internal heat dissipation components 11 transfer the heat generated during transformer operation to the external heat dissipation components 12; the external heat dissipation components 12 dissipate the heat transferred from the internal heat dissipation components 11 into the external space. It is understandable that transformers generate a lot of heat during operation, and the resonant cavity 8 also converts most of the energy of noise sound waves into heat energy, which will raise the temperature of the transformer. If heat dissipation is not carried out in a timely and effective manner, it will affect the insulation performance and operational stability of the transformer, and may even cause serious safety accidents. Therefore, this application sets up an internal heat dissipation component 11 and an external heat dissipation component 12 to dissipate the heat in the housing cavity 4 in a timely and effective manner, thereby achieving a good balance between noise reduction and heat dissipation performance, and effectively preventing the transformer from being damaged due to excessive temperature.

[0055] Transformer losses mainly consist of two parts: iron losses and copper losses. Iron losses are composed of hysteresis losses and eddy current losses in the iron core, and are a constant independent of the transformer load. Copper losses are composed of the resistive losses of the windings, and are proportional to the square of the load current. The heat generated during transformer operation mainly comes from these two types of losses. For a 1000kVA oil-immersed transformer, its total loss at full load is approximately 10kW, of which iron losses are approximately 1.7kW and copper losses are approximately 8.3kW. If this heat cannot be dissipated in time, it will cause the transformer oil temperature to rise, thereby affecting the lifespan of the insulation materials.

[0056] Traditional closed-loop noise reduction solutions typically involve creating ventilation openings on the side walls of the noise reduction device for heat dissipation. While simple, this method leads to significant noise leakage, severely impacting the noise reduction effect. Furthermore, natural ventilation has low heat dissipation efficiency, failing to meet the cooling requirements of large-capacity transformers. Forced ventilation, while improving efficiency, increases energy consumption and noise. This application addresses these shortcomings with a "separated internal and external heat dissipation system." Specifically, the internal heat dissipation component 11 is in direct contact with the transformer, rapidly absorbing its heat. The external heat dissipation component 12, located outside the noise reduction device, directly dissipates heat into the ambient air. The contact between the internal and external components ensures efficient heat transfer. This method eliminates the need for ventilation openings on the side walls, maintaining the device's airtightness and achieving optimal noise reduction. Simultaneously, its high heat dissipation efficiency meets the cooling requirements of large-capacity transformers. In addition, the heat dissipation system of this application is completely passive and requires no power equipment, so it will not generate additional noise and energy consumption, has low operating costs and high reliability. For some transformers with particularly high heat dissipation requirements, a cooling fan can be added to the external heat dissipation component 12 to achieve active heat dissipation and further improve heat dissipation efficiency.

[0057] As one example, please refer to Figure 9 and combined Figure 12 , Figure 12 What is shown is Figure 9A partial enlarged view of point G. The internal heat dissipation assembly 11 includes a heat sink 111, an internal heat spreader 112, an internal heat conduction seat 114, and multiple heat conduction pipes 113. The heat sink 111 is attached to one side of the transformer. The internal heat spreader 112 is disposed on the heat sink 111. One end of each of the multiple heat conduction pipes 113 is disposed on the internal heat spreader 112, and the other end extends toward the top cover 2. The internal heat conduction seat 114 is disposed on one end of the multiple heat conduction pipes 113 adjacent to the top cover 2. An internal heat transfer layer 115 is attached to the internal heat conduction seat 114. The internal heat transfer layer 115 is in contact with one end of the external heat dissipation assembly 12 that extends into the receiving cavity 4. Furthermore, the external heat dissipation assembly 12 includes an external heat conduction seat 121, an external heat dissipation seat 123, and two heat dissipation pipe groups 124. The external heat conduction seat 121 is disposed on the top cover 2 and extends into the receiving cavity 4 and contacts the inner heat transfer layer 115. An external heat transfer layer 122 is attached to the external heat conduction seat 121. The external heat dissipation seat 123 is disposed on the external heat transfer layer 122. The two heat dissipation pipe groups 124 are disposed on the external heat dissipation seat 123 and are respectively located at opposite ends of the external heat dissipation seat 123. Each heat dissipation pipe group 124 includes multiple heat dissipation pipes 1241 arranged side by side and several fins 126 stacked on the multiple heat dissipation pipes 1241. It is understood that when the transformer is cooled by the internal heat dissipation assembly 11 and the external heat dissipation assembly 12, the heat generated by the transformer is dissipated to the outside space sequentially through the heat sink 111, the internal heat spreader 112, the heat pipe 113, the internal heat conduction base 114, the internal heat transfer layer 115, the external heat conduction base 121, the external heat transfer layer 122, the external heat spreader 123, the heat pipe 1241, and the fins 126. Preferably, the external heat dissipation assembly 12 further includes a cooling fan 125, which is disposed on the external heat spreader 123 and located between the two heat pipe groups 124. Of course, in other embodiments, liquid cooling can be used instead of air cooling. Liquid cooling has higher heat dissipation efficiency and operates more quietly, making it suitable for large-capacity transformers or applications with particularly high noise requirements.

[0058] It should be noted that the heat sink 111 is a component used to dissipate heat from the equipment (i.e., the transformer). It is typically made of a metal material with good thermal conductivity, such as aluminum, copper, and their alloys. When the transformer generates heat, the heat is transferred to the heat sink 111 through thermal conduction. Due to the large surface area of ​​the heat sink 111 and its good contact with the inner heat spreader 112, the heat generated by the transformer can be quickly dissipated from the surface of the heat sink to the inner heat spreader 112. The inner heat spreader 112 is a component with uniform heat dissipation characteristics. It is typically made of a material with good thermal conductivity, such as metals like copper and aluminum, as well as composite materials with high thermal conductivity. The inner heat spreader 112 can quickly absorb the heat dissipated by the heat sink 111, and this heat will be evenly distributed on the inner heat spreader 112. A heat pipe 113 is a tubular element used for efficient heat transfer, typically consisting of three parts: a shell, a wick, and a working fluid. The shell is generally made of a metal material, such as copper, aluminum, or stainless steel, providing good strength and sealing properties, and capable of withstanding certain pressures. The wick is one of the key components of the heat pipe 113; it is usually made of porous materials, such as wire mesh, powder metallurgy materials, or ceramics, and its function is to provide capillary forces, allowing the working fluid to circulate within the pipe. The working fluid is the medium used to transfer heat in the heat pipe 113; common working fluids include water, ammonia, etc. Methanol, ethanol, and other different working fluids are suitable for different temperature ranges and operating conditions. When the inner heat spreader 112 absorbs heat from the heat sink 111, the end of the heat pipe 113 connected to the inner heat spreader 112 is heated. The working fluid absorbs heat at this end and evaporates into steam. Under the action of the pressure difference inside the pipe, the steam quickly flows to the other end. The steam condenses into liquid at the end of the heat pipe 113 near the top cover 2. Under the capillary force of the liquid wick, the liquid flows back to the end of the heat pipe 113 connected to the inner heat spreader 112. This cycle repeats, ultimately achieving efficient heat transfer. The inner heat spreader 114 is a component used to conduct heat. It is usually made of materials with good thermal conductivity, such as metals like copper and aluminum, as well as thermally conductive ceramics. Its main function is to transfer heat from the heat pipe 113 to the inner heat transfer layer 115. The inner heat transfer layer 115 is a layered structure used for heat conduction. Its main function is to transfer heat from the inner heat-conducting seat 114 to the outer heat-conducting seat 121. It can be made of: a silicone grease layer; a carbon nanotube heat-conducting layer; a heat-conducting pad made of elastic material (such as rubber, silicone, etc.) with added heat-conducting fillers; a phase change material layer that undergoes a phase change at a specific temperature (such as from solid to liquid); or a metal heat-conducting layer (such as copper foil, aluminum foil, metal heat sink, etc.).

[0059] It should also be noted that the outer heat-conducting base 121 is similar to the inner heat-conducting base 114, and will not be described in detail here. Its main function is to transfer heat from the inner heat transfer layer 115 to the outer heat transfer layer 122. The outer heat transfer layer 122 is similar to the inner heat transfer layer 115, and will not be described in detail here. Its main function is to transfer heat from the outer heat-conducting base 121 to the outer heat-spreading base 123. The outer heat-spreading base 123 is similar to the inner heat-spreading base 112, and will not be described in detail here. Its main function is to transfer heat from the outer heat transfer layer 122 to the heat dissipation pipe 1241. The heat dissipation pipe 1241 is similar to the heat pipe 113, and will not be described in detail here. Its main function is to dissipate heat from the outer heat-spreading base 123 into the external space. The fins 126 can increase the heat dissipation area of ​​the heat dissipation pipe 1241, and the cooling fan 125 can form a cooling airflow between the two heat dissipation pipe groups 124 to accelerate cooling, ultimately achieving a strong heat dissipation effect.

[0060] To further improve heat dissipation, the surface of the fins 126 can be treated, such as by anodizing or spraying with black paint, to increase the surface emissivity of the fins 126, thereby enhancing radiative heat dissipation. The emissivity of a black surface can reach over 0.9, significantly improving radiative heat dissipation. In addition, a shroud made of thin steel plate can be installed on the outside of the heat pipe assembly 124 to guide air in from the bottom and out from the top, forming a good ventilation channel and improving the efficiency of natural convection heat dissipation. Optionally, a rain cap can be installed on the top of the shroud to prevent rainwater from entering the heat pipe assembly 124 and causing the fins 126 to rust.

[0061] Of course, a temperature sensor and an intelligent control module can also be added. The temperature sensor is used to monitor the transformer temperature in real time. When the transformer temperature is lower than the first preset temperature threshold (e.g., 50℃), the intelligent control module controls the cooling fan 125 to remain off, relying on natural heat dissipation to meet the requirements. When the transformer temperature is higher than the second preset temperature threshold (e.g., 65℃), the intelligent control module controls the cooling fan 125 to start for forced air cooling. When the transformer temperature is higher than the third preset temperature threshold (e.g., 80℃), the intelligent control module outputs an overheat alarm signal to remind maintenance personnel to check for abnormalities. This intelligent temperature control scheme allows the cooling fan 125 to remain off most of the time, reducing operating energy consumption, avoiding additional noise generated by the cooling fan 125, and extending the service life of the cooling fan 125. Furthermore, a noise sensor can be added to monitor the noise level inside and outside the noise reduction device in real time. When the noise reduction level drops abnormally, the intelligent control module automatically issues a maintenance reminder, notifying staff to check whether the device is damaged, has dust accumulation, or other problems, thus achieving intelligent operation and maintenance.

[0062] The above embodiments are merely preferred implementations of this application and are not the only limitation on the transformer noise reduction device. Those skilled in the art can flexibly configure the device based on the above embodiments and the actual application scenario. It is understood that through the implementation of the above embodiments of this application, a transformer noise reduction device is constructed using a base 1, a top cover 2, and multiple noise reduction plate assemblies 3. Each noise reduction plate assembly 3 includes a housing 5, multiple fixed cylinders 6, and multiple sound-absorbing plates 7. Multiple housings 5 ​​are erected end-to-end on the base 1, and the top cover 2 covers the multiple housings 5. The top cover 2, the base 1, and the multiple housings 5 ​​enclose a receiving cavity 4, which is used to accommodate the transformer installed on the base 1. For a single noise reduction plate assembly 3, multiple fixed cylinders 6 are erected at intervals along the length x direction of the housing 5 within the housing 5, and multiple sound-absorbing plates 7 are respectively erected within the multiple fixed cylinders 6. Each sound-absorbing plate 7 extends spirally around the central axis of the corresponding fixed cylinder 6. The outer sidewalls of any two adjacent fixed cylinders 6, facing each other, enclose the two inner sidewalls of the housing 5, which are opposite each other in the thickness / width y direction, to form a resonant cavity 8. In practical applications, the transformer is surrounded by multiple noise reduction plate assemblies 3. Part of the noise generated during transformer operation is reflected back by the housing 5, while another part enters the housing 5 and then into the various fixed cylinders 6 and resonant cavities 8. Since the sound-absorbing plates 7 inside the fixed cylinders 6 are spiral-shaped, they guide the noise to reflect continuously within themselves, thus extending the sound wave propagation path and consuming the sound wave energy, ultimately reducing the noise. After the noise enters the resonant cavity 8, the air molecules within the cavity vibrate back and forth in different directions to generate resonance. At resonance, the amplitude of the air molecules in the cavity 8 is at its maximum, causing most of the sound wave energy to be converted into heat energy, further reducing the noise. Therefore, compared to conventional noise reduction structures such as sound-absorbing cotton used in traditional solutions, the transformer noise reduction device of this application achieves triple noise reduction (i.e., the housing 5 reflects the noise, the sound-absorbing plates 7 extend the sound wave propagation path, and the resonant cavity 8 converts the sound wave energy), resulting in better noise reduction and effectively avoiding impact on the normal lives of nearby residents.

[0063] It should be noted that the several embodiments shown above in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should also be noted that in the textual description of this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply such an actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements may include not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus; and, without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0064] Furthermore, those skilled in the art can implement or use this application by practicing the several embodiments shown above. Various modifications to the embodiments shown above will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments not shown without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the several embodiments shown above, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A transformer noise reduction device, characterized in that, The device includes a base, a top cover, and multiple noise reduction plate assemblies. The multiple noise reduction plate assemblies are erected on the base with their ends connected to the ground. The top cover is placed on the multiple noise reduction plate assemblies. The top cover, the base, and the multiple noise reduction plate assemblies enclose a receiving cavity, which is used to accommodate a transformer installed on the base. The noise reduction panel assembly includes a housing, multiple fixed cylinders, and multiple sound-absorbing panels. The housing is erected on the base. The multiple fixed cylinders are erected at intervals along the length of the housing inside the housing. The multiple sound-absorbing panels are erected in the multiple fixed cylinders respectively. Each sound-absorbing panel extends spirally around the central axis of the corresponding fixed cylinder. The outer sidewalls of any two adjacent fixed cylinders facing each other are enclosed by the two inner sidewalls of the housing facing each other in the thickness direction to form a resonant cavity.

2. The transformer noise reduction device according to claim 1, characterized in that, The housing includes a main shell and an auxiliary shell. The main shell is erected on the base, and the auxiliary shell is erected inside the main shell. A plurality of fixed cylinders are erected at intervals along the length of the auxiliary shell. The outer sidewalls of any two adjacent fixed cylinders are surrounded by the two inner sidewalls of the auxiliary shell in the thickness direction to form the resonant cavity. The main shell has an inwardly recessed main positioning groove on the two outer sidewalls in the length direction, and a corresponding main positioning boss adapted to the main positioning groove is formed on the two inner sidewalls in the length direction. The auxiliary shell has an inwardly recessed auxiliary positioning groove on the two outer sidewalls in the length direction, and a corresponding auxiliary positioning boss adapted to the auxiliary positioning groove is formed on the two inner sidewalls in the length direction. The two main positioning bosses are respectively inserted into the two auxiliary positioning grooves.

3. The transformer noise reduction device according to claim 2, characterized in that, The main shell includes a front shell plate, a rear shell plate, and two cover plates. The front shell plate and the rear shell plate are erected on the base opposite to each other and spaced apart from each other. The front shell plate has front extension plates extending toward the rear shell plate on both opposite sides in the length direction. The two front extension plates have inwardly recessed first main positioning grooves on their opposite sidewalls. The two front extension plates have corresponding first main positioning bosses that are adapted to the first main positioning grooves on their opposite sidewalls. The rear shell plate has rear extension plates extending toward the front shell plate on both opposite sides in the length direction. The two rear extension plates have inwardly recessed second main positioning grooves on their opposite sidewalls. The two rear extension plates have corresponding second main positioning bosses that are adapted to the second main positioning grooves on their opposite sidewalls. The two front extension plates are respectively attached to the two rear extension plates. The two first main positioning bosses are respectively inserted into the two second main positioning slots. The two second main positioning bosses are respectively inserted into the two auxiliary positioning slots. The front shell plate, the rear shell plate, the two front extension plates and the two rear extension plates surround to form a cavity. The auxiliary shell is erected in the cavity. The cavity has two main shell openings opposite each other in the height direction of the main shell. The two cover plates are respectively covered at the two main shell openings to close the cavity.

4. The transformer noise reduction device according to claim 3, characterized in that, The auxiliary shell has two auxiliary shell openings opposite each other in the height direction. A sound-absorbing material layer is attached to the opposing surfaces of the two cover plates. The two opposite ends of the sound-absorbing material layer are formed with slots that are adapted to the ends of the auxiliary positioning bosses. The sound-absorbing material layer is used to cover the corresponding auxiliary shell opening when the cover plate is placed on the main shell opening, and to allow the ends of the two auxiliary positioning bosses to be inserted into the two slots respectively.

5. The transformer noise reduction device according to claim 2, characterized in that, It also includes multiple flexible columns and multiple transition columns. The flexible columns are erected on the base and are located between two adjacent noise reduction plate assemblies with the same length direction. Each flexible column has two positioning ribs extending along its own height direction and opposite to each other. The two positioning ribs are respectively inserted into the two main positioning slots of the two adjacent main shells with the same length direction. The transition columns are erected on the base and are located between two adjacent noise reduction plate assemblies with perpendicular length direction. Each transition column has two positioning strips extending along its own height direction and perpendicular to each other. The two positioning strips are respectively inserted into the two main positioning slots of the two adjacent main shells with perpendicular length direction.

6. The transformer noise reduction device according to claim 5, characterized in that, The top cover has a plurality of positioning blocks on the side facing the base, each corresponding to a plurality of adapter posts, and the plurality of positioning blocks are respectively inserted into the ends of the plurality of adapter posts.

7. The transformer noise reduction device according to claim 1, characterized in that, It also includes two internal heat dissipation components and two external heat dissipation components. The two internal heat dissipation components are located within the receiving cavity. One end of each internal heat dissipation component is respectively attached to opposite sides of the transformer, and the other end of each internal heat dissipation component extends towards the top cover. One end of each external heat dissipation component is positioned opposite and spaced apart from each other on the top cover and extends into the receiving cavity. The ends of the two external heat dissipation components located within the receiving cavity are in contact with the two internal heat dissipation components. The internal heat dissipation component is used to transfer the heat generated by the transformer during operation to the external heat dissipation component; the external heat dissipation component is used to dissipate the heat to the outside space.

8. The transformer noise reduction device according to claim 7, characterized in that, The internal heat dissipation assembly includes a heat sink, an internal heat spreader, a heat pipe, and an internal heat conduction seat. The heat sink is attached to one side of the transformer. The internal heat spreader is disposed on the heat sink. One end of the heat pipe is disposed on the internal heat spreader and the other end extends toward the top cover. The internal heat conduction seat is disposed on the end of the heat pipe adjacent to the top cover. An internal heat transfer layer is attached to the internal heat conduction seat. The internal heat transfer layer is in contact with one end of the external heat dissipation assembly that extends into the receiving cavity.

9. The transformer noise reduction device according to claim 8, characterized in that, The external heat dissipation assembly includes an external heat-conducting base, an external heat-spreading base, and two heat dissipation pipe groups. The external heat-conducting base is disposed on the top cover and extends into the receiving cavity to contact the inner heat transfer layer. An external heat transfer layer is attached to the external heat-conducting base. The external heat-spreading base is disposed on the external heat transfer layer. The two heat dissipation pipe groups are disposed on the external heat-spreading base and are respectively located at opposite ends of the external heat-spreading base. Each heat dissipation pipe group includes multiple heat dissipation pipes arranged side by side and several fins stacked and sleeved on the multiple heat dissipation pipes.

10. The transformer noise reduction device according to claim 9, characterized in that, The external heat dissipation assembly also includes a cooling fan disposed on the external heat spreader and located between the two heat dissipation pipe groups.

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