Dry-type transformer noise reduction device

Abstract

This utility model discloses a noise reduction device for dry-type transformers, relating to the field of transformer technology. The device includes a base vibration damping assembly comprising a support base disposed at the bottom of the transformer, the support base being connected to the transformer housing via at least four adaptive vibration damping units; a winding noise reduction structure, wherein both the high-voltage and low-voltage windings of the transformer are fitted with annular damping sleeves; and a fan noise reduction unit, wherein the inner walls of the fan inlet and outlet at the top of the transformer are covered with sound-absorbing cotton. Each adaptive vibration damping unit includes: a support member at the upper end, a connecting rod at the lower end, a magnetorheological damper located between the support member and the connecting rod, and a vibration sensor disposed on the transformer housing and electrically connected to the magnetorheological damper. This device, through the synergistic effect of multiple structures, effectively reduces the operating noise of dry-type transformers from multiple aspects such as vibration damping, winding noise reduction, and fan noise reduction, improving the comfort of the user environment and showing good application prospects.

Description

Technical Field

[0001] This utility model relates to the field of dry-type transformer technology, and more specifically to a noise reduction device for dry-type transformers. Background Technology

[0002] The causes of noise from dry-type transformers are complex and mainly come from several aspects. First, when the transformer is working, the electromagnetic force in the windings causes the windings to vibrate, and this vibration is transmitted through the structure, generating noise. Second, when the fan in the transformer cooling system is running, the friction between the fan blades and the air, as well as the mechanical vibration of the fan itself, also generate significant noise. Third, the vibration transmission between the transformer base and the ground or mounting foundation is also one of the important pathways for noise generation and propagation.

[0003] Currently, while some methods and devices exist for noise reduction in dry-type transformers, many shortcomings remain. For example, traditional vibration damping measures often employ simple damping pads or spring dampers. These methods have poor adaptability and are difficult to effectively adjust according to the vibration characteristics of the transformer under different operating conditions, resulting in limited noise reduction effects. For noise generated by winding vibration, existing noise reduction structures cannot adequately conform to the windings and suppress their vibration. Furthermore, conventional noise reduction methods for cooling fans are insufficient to meet increasingly stringent noise reduction requirements. Therefore, there is an urgent need for a noise reduction device that can effectively reduce the noise of dry-type transformers, is highly adaptable, and has a significant noise reduction effect, in order to solve the problems existing in the current technology. Utility Model Content

[0004] The purpose of this utility model is to provide a noise reduction device for dry-type transformers in order to solve the above-mentioned technical problems.

[0005] The technical solution adopted in this utility model is as follows: A dry-type transformer noise reduction device, comprising:

[0006] The base damping assembly includes a support base disposed at the bottom of the transformer, and the support base is connected to the transformer housing through at least four adaptive damping units; dynamic damping adjustment is achieved through the magnetorheological damper and vibration sensor of the adaptive damping unit, which effectively suppresses the multi-frequency vibration generated during transformer operation and reduces the energy of vibration transmitted to the support structure.

[0007] The winding noise reduction structure includes annular damping sleeves fitted on the outer sides of both the high-voltage and low-voltage windings of the transformer; the annular damping sleeves constrain winding vibration and reduce mechanical noise caused by electromagnetic force.

[0008] The fan noise reduction unit has sound-absorbing cotton lining the inner walls of the cooling fan inlet and outlet on the top of the transformer. The sound-absorbing cotton weakens the high-frequency components of the fan airflow noise, significantly improving noise pollution at the inlet and outlet.

[0009] Each of the adaptive damping units includes: a support member at the upper end, a connecting rod at the lower end, a magnetorheological damper located between the support member and the connecting rod, and a vibration sensor mounted on the transformer housing and electrically connected to the magnetorheological damper.

[0010] By combining multi-dimensional noise reduction with intelligent vibration suppression of mechanical vibration, electromagnetic noise, and airflow noise, noise reduction efficiency is improved.

[0011] Preferably, the support base includes a bottom shock-absorbing component, an elastic support component, and a transformer mounting component arranged sequentially from bottom to top;

[0012] The bottom shock absorption assembly includes a second base plate and multiple parallel L-shaped steel pipes welded to its lower surface. The four corners of the second base plate are provided with foot pads that are connected to the bottom of the rectangular frame.

[0013] The elastic support assembly includes rectangular steel pipes horizontally welded at equal intervals to the upper surface of the second base plate, and each rectangular steel pipe together supports the first base plate.

[0014] The transformer mounting assembly includes a transformer fixed to a first base plate, the top of which forms a triangular reinforcement structure with the upper frame of a rectangular skeleton through an obliquely arranged connecting pipe.

[0015] Preferably, at least two L-shaped steel pipes are provided, and the height of their vertical sections corresponds to the height of the foot pads; the foot pads adopt a rubber-metal composite structure, and their bottom surfaces are provided with anti-slip textures.

[0016] Preferably, at least two rectangular steel pipes are provided; an elastic pad is provided between the first base plate and the rectangular steel pipes.

[0017] Preferably, the connecting pipe forms a 45-60° angle with the horizontal plane; the vertex connection position of the triangular reinforcement structure is provided with a stress-dispersing rib, the thickness of which is 1.2-1.5 times the wall thickness of the connecting pipe.

[0018] Preferably, the top of the magnetorheological damper is connected to the top side wall of the transformer via a support member, and its bottom is fixedly connected to the upper surface of the second base plate; the central axis of the connecting rod forms a spatial angle of 30-60° with the piston movement direction of the magnetorheological damper; the side wall of the magnetorheological damper is connected to the lateral extension of the rectangular steel tube via an adjustable universal joint.

[0019] Preferably, the damping sleeve comprises, from the inside out: a metal constraint layer and a stainless steel layer with a thickness of 1-2 mm; to limit the radial deformation of the winding and suppress high-frequency vibration;

[0020] The waveform vibration-absorbing layer is made of polyurethane-based composite material, with a waveform amplitude of 2-5mm and a wavelength of 10-20mm; it dissipates vibration energy through the viscoelasticity of the material, thereby reducing mid-to-low frequency noise.

[0021] The guide grooves are spirally distributed on the outer surface of the waveform shock-absorbing layer, with a groove depth of 1-3 mm and a groove width of 2-4 mm. This disrupts the sound wave propagation path and enhances the organization of heat dissipation airflow.

[0022] Preferably, it further includes: an intelligent control system, which is electrically connected to the vibration sensor, the magnetorheological damper, and the cooling fan; the intelligent control system is configured to: activate a multi-level vibration suppression mode when the detected load current is >80% of the rated value; adjust the excitation current of the magnetorheological damper proportionally according to the difference between the vibration amplitude of the casing and a preset threshold; and simultaneously reduce the speed of the cooling fan to 70-90% of the reference value when the vibration frequency is >200Hz.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0024] 1. A triple noise reduction architecture, consisting of a base vibration damping component, a winding noise reduction structure, and a fan noise reduction unit, is used to suppress mechanical vibration noise, electromagnetic noise, and aerodynamic noise, forming a systematic noise reduction solution. Closed-loop control of the magnetorheological damper and vibration sensor enables dynamic damping adjustment, reducing vibration transmission rate.

[0025] 2. The support base adopts an L-shaped steel pipe welded frame and a split shock absorption design. Through three levels of energy dissipation—the bottom shock absorption layer (foot pads + steel pipes), the elastic support layer (rectangular steel pipes + elastic pads), and the reinforcement layer (triangular connecting pipes)—it effectively isolates most of the foundation vibration.

[0026] 3. The magnetorheological damper and the connecting rod are arranged at a spatial angle of 30-60° to form a multi-dimensional damping topology. Combined with the universal joint connection, it can absorb both lateral and longitudinal vibrations at the same time.

[0027] 4. The composite structure of the metal constraint layer and the waveform shock absorption layer can reduce the vibration acceleration level of the winding. The spiral guide groove design improves heat dissipation efficiency while reducing noise, thus solving the technical contradiction that traditional noise reduction sleeves affect heat dissipation.

[0028] 5. By interacting with the vibration sensor and the magnetorheological damper in real time, a vibration frequency-damping force mapping model is constructed to achieve millisecond-level dynamic damping adjustment.

[0029] 6. The stress-dispersing rib design of the triangular reinforcement structure improves the fatigue life of key nodes, and the rubber-metal composite foot pads with anti-slip texture improve the anti-slip coefficient of the foundation, ensuring the structural integrity of the equipment.

[0030] 7. Improved operational and maintenance economy: The modular design allows for independent maintenance and replacement of each noise reduction unit, reducing maintenance costs. The intelligent control system can further save energy by optimizing fan speed. Attached Figure Description

[0031] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0034] Figure 3 This is a schematic diagram of the cross-sectional structure of this utility model (AA).

[0035] Figure 4 This is a cross-sectional view of the noise reduction structure of the BB winding of this utility model;

[0036] Figure 5 This is a schematic diagram of the shock absorption unit structure of this utility model;

[0037] Figure 6 This is a schematic diagram of the fan structure of this utility model;

[0038] The components in the diagram are labeled as follows: 1-Transformer, 11-Shell, 12-Heat sink assembly, 13-Guide groove, 14-Waveform shock-absorbing layer, 15-Insulation constraint layer, 16-Winding conductor, 2-Adaptive damping unit, 21-Magnetorheological damper, 22-Supporting component, 23-Connecting rod, 3-Fan, 31-Sound-absorbing cotton, 4-Vibration sensor, 5-Supporting base, 51-Rectangular frame, 52-First base plate, 53-Rectangular steel pipe, 54-Second base plate, 55-Foot pad, 56-L-shaped steel pipe, 57-Connecting pipe. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] In one embodiment of this utility model, such as Figure 1-6 As shown, this embodiment provides a noise reduction device for a dry-type transformer, including:

[0042] The base damping assembly includes a support base 5 disposed at the bottom of the transformer 1. The support base 5 is connected to the transformer 1 housing 11 by at least four adaptive damping units 2. Dynamic damping adjustment is achieved through the magnetorheological damper 21 and vibration sensor 4 of the adaptive damping unit 2, which effectively suppresses the multi-frequency vibration generated during the operation of the transformer 1 and reduces the energy transmitted to the support structure by the vibration.

[0043] The winding noise reduction structure includes annular damping sleeves fitted on the outer sides of both the high-voltage and low-voltage windings of the transformer 1; the annular damping sleeves constrain winding vibration and reduce mechanical noise caused by electromagnetic force.

[0044] The noise reduction unit of the fan 3 has sound-absorbing cotton 31 attached to the inner wall of the air inlet and outlet of the cooling fan 3 on the top of the transformer 1; the sound-absorbing cotton 31 weakens the high-frequency components of the airflow noise of the fan 3, and significantly improves the noise pollution of the air inlet and outlet.

[0045] Each of the adaptive damping units 2 includes: a support member 22 at the upper end, a connecting rod 23 at the lower end, a magnetorheological damper 21 located between the support member 22 and the connecting rod 23, and a vibration sensor 4 disposed on the housing 11 of the transformer 1 and electrically connected to the magnetorheological damper 21.

[0046] By combining multi-dimensional noise reduction with intelligent vibration suppression of mechanical vibration, electromagnetic noise, and airflow noise, noise reduction efficiency is improved.

[0047] In another embodiment of this utility model, the support base 5 includes a bottom shock absorption assembly, an elastic support assembly, and a transformer 1 mounting assembly arranged sequentially from bottom to top;

[0048] The bottom shock absorption assembly includes a second base plate 54 and multiple parallel L-shaped steel pipes welded to its lower surface. The four corners of the second base plate 54 are provided with foot pads 55 that are connected to the bottom of the rectangular frame 51.

[0049] The elastic support assembly includes rectangular steel pipes 53 horizontally welded at equal intervals to the upper surface of the second base plate 54, and each rectangular steel pipe 53 together supports the first base plate 52.

[0050] The transformer 1 mounting assembly includes a transformer 1 fixed on a first base plate 52. The top of the transformer 1 forms a triangular reinforcement structure with the upper frame of the rectangular frame 51 through an obliquely arranged connecting pipe 57.

[0051] The base features a layered design: the L-shaped steel pipe 56 and foot pads 55 of the bottom shock-absorbing component isolate ground vibrations; the rectangular steel pipe 53 and the first base plate 52 of the elastic support component absorb the vibrations of the transformer 1 itself; and the triangular reinforcement structure enhances overall rigidity and prevents resonance deformation. The combination of multi-layered shock absorption and structural reinforcement improves the base's impact resistance and long-term stability.

[0052] In another embodiment of this utility model, at least two L-shaped steel pipes are provided, with the height of their vertical sections corresponding to the height of the foot pads 55. The foot pads 55 adopt a rubber-metal composite structure, and their bottom surfaces are provided with anti-slip textures. The height of the L-shaped steel pipes 56 matches the foot pads 55, ensuring uniform force distribution on the base and avoiding localized stress concentration. The rubber-metal composite foot pads 55 combine shock absorption performance and durability, and the anti-slip textures prevent the base from shifting. This enhances installation stability and adapts to complex ground environments.

[0053] In another embodiment of this utility model, at least two rectangular steel pipes 53 are provided; an elastic pad is provided between the first base plate 52 and the rectangular steel pipes 53. The elastic pad further attenuates the vibration transmission between the first base plate 52 and the rectangular steel pipes 53, reducing metal-to-metal contact noise. Multiple rectangular steel pipes 53 increase the support area, distribute the weight of the transformer 1, and prevent deformation of the base plate. This optimizes the low-frequency vibration suppression capability and extends the service life of the base.

[0054] In another embodiment of this utility model, the connecting pipe 57 forms a 45-60° angle with the horizontal plane; a stress-dispersing rib is provided at the vertex connection position of the triangular reinforcement structure, and the thickness of the rib is 1.2-1.5 times the wall thickness of the connecting pipe 57. The 45-60° angle of the connecting pipe 57 forms an efficient force transmission path, improving the overturning resistance of the triangular reinforcement structure. The stress-dispersing rib avoids stress concentration at the connection point and prevents fatigue cracking. It significantly improves the structure's vibration resistance and wind load resistance, making it suitable for harsh outdoor environments.

[0055] In another embodiment of this utility model, the top of the magnetorheological damper 21 is connected to the top sidewall of the transformer 1 via a support member 22, and its bottom is fixedly connected to the upper surface of the second base plate 54; the central axis of the connecting rod 23 forms a 30-60° spatial angle with the piston movement direction of the magnetorheological damper 21; the sidewall of the magnetorheological damper 21 is connected to the lateral extension of the rectangular steel tube 53 via an adjustable universal joint. The 30-60° angle of the connecting rod 23 adapts to the main vibration direction of the transformer 1, optimizing the energy dissipation efficiency of the damper. The adjustable universal joint allows for multi-degree-of-freedom adjustment of the damper, adapting to complex vibration modes. This enhances the damper's adaptability to different vibration frequencies and directions, improving the vibration damping coverage.

[0056] In another embodiment of this utility model, the annular damping sleeve comprises, from the inside out: a metal constraint layer and a stainless steel layer with a thickness of 1-2 mm; to limit the radial deformation of the winding and suppress high-frequency vibration;

[0057] The waveform vibration-absorbing layer 14 is made of polyurethane-based composite material, with a waveform amplitude of 2-5mm and a wavelength of 10-20mm; it dissipates vibration energy through the viscoelasticity of the material, thereby reducing mid-to-low frequency noise.

[0058] The guide grooves 13 are spirally distributed on the outer surface of the waveform shock-absorbing layer 14, with a groove depth of 1-3 mm and a groove width of 2-4 mm. This disrupts the sound wave propagation path while enhancing the organization of heat dissipation airflow. It achieves multi-level noise reduction through electromagnetic, mechanical, and acoustic methods, while also meeting heat dissipation requirements.

[0059] In another embodiment of this utility model, it further includes: an intelligent control system electrically connected to the vibration sensor 4, the magnetorheological damper 21, and the cooling fan 3; the intelligent control system is configured to: activate a multi-level vibration suppression mode when the detected load current is >80% of the rated value; proportionally adjust the excitation current of the magnetorheological damper 21 according to the difference between the vibration amplitude of the casing and a preset threshold; and simultaneously reduce the speed of the cooling fan 3 to 70-90% of the reference value when the vibration frequency is >200Hz. The multi-level vibration suppression mode actively enhances vibration damping under high loads to prevent structural damage caused by overload vibration. The proportional adjustment of the excitation current matches the vibration intensity in real time, avoiding overload or insufficient damping. Dynamic speed control of the fan 3 reduces speed during high-frequency vibrations to balance noise and heat dissipation requirements. Intelligent multi-parameter collaborative control achieves the optimal balance between energy efficiency and noise reduction.

[0060] The working principle of this utility model is as follows:

[0061] 1. The base shock absorption assembly dynamically reduces vibration. Vibration sensor 4 monitors the vibration spectrum of transformer 1 housing 11 in real time. The magnetic field strength of magnetorheological damper 21 is dynamically adjusted by intelligent control system, so that the viscosity of damping fluid can achieve millisecond-level response within 0.5-1 seconds. The dampers arranged in a 30-60° spatial arrangement form an asymmetric damping matrix, which effectively decomposes the horizontal and vertical vibration components. Experimental data shows that it can reduce the structural vibration transmission rate by up to 65%.

[0062] 2. The composite support base 5 provides vibration damping, while the L-shaped steel pipe 56 and elastic pad layer provide coupled vibration damping. The L-shaped steel pipe 56 absorbs high-frequency vibrations (>500Hz) through geometric deformation, and the rubber-metal composite foot pad 55 isolates low-frequency vibrations (50-100Hz). The composite structure can reduce vibration acceleration by 42%. The rectangular steel pipe 53 array forms a distributed elastic support, which, together with the elastic pad layer, forms a secondary filter, further attenuating residual vibration energy by 30%.

[0063] 3. Energy conversion of winding vibration: multi-layer damping sleeves dissipate energy, and the polyurethane waveform layer converts the axial vibration of the winding into heat energy through viscoelastic deformation (energy conversion efficiency reaches 78%); the spiral guide groove 13 guides the radial vibration wave to form eddy current interference, and the stainless steel constraint layer achieves phase cancellation of the vibration wave, which can reduce the winding vibration noise by 12dBA in actual measurement.

[0064] 4. Intelligent wind noise control system with adaptive acoustic adjustment; sound-absorbing cotton 31 adopts a gradient density structure (surface area 500 kg / m²). 3 →Inner layer 150kg / m 3 The sound absorption coefficient is >0.9 in the 200-2000Hz frequency band; the intelligent system links and controls the fan speed and damper parameters to maintain the noise value within ±2dB fluctuation range when the load changes.

[0065] 5. Structural reinforcement and vibration decoupling: The triangular reinforcement system and the 45-60° inclined connecting pipe 57 form a spatial truss structure, which increases the overall stiffness by 40% while reducing the local stress peak by 35% through the stress dispersion design of the rib plate; the universal joint connection realizes the controllable decoupling of the vibration transmission path and avoids the phenomenon of resonance frequency coupling.

[0066] 6. Multi-physics field collaborative control: The intelligent control system establishes the following control logic through a multi-parameter fusion algorithm of vibration, temperature, and noise:

[0067] a. Sampling frequency: 2kHz for vibration signal / 48kHz for noise signal;

[0068] b. Control strategy: When the vibration acceleration is >0.5g, the strong damping mode is activated, and when the noise spectrum reaches a peak at 315Hz, the fan 3 speed reduction program is triggered;

[0069] c. Energy management: Prioritize ensuring a noise limit of <65dB(A) and a system response time of ≤300ms;

[0070] This device achieves a comprehensive noise reduction of 18-25 dBA for transformer 1 through a triple mechanism of mechanical impedance matching, energy form conversion, and intelligent dynamic control. It is particularly effective in suppressing characteristic noise in the 100-800Hz range, meeting the requirements of the secondary quietness standard for power equipment.

Claims

1. A dry-type transformer noise reduction device, characterized by, The device comprises: a base damping assembly, which comprises a supporting base (5) arranged at the bottom of the transformer (1), and the supporting base (5) is connected with the shell (11) of the transformer (1) through at least four adaptive damping units (2); a winding noise reduction structure, which comprises annular damping sleeves arranged outside the high-voltage winding and the low-voltage winding of the transformer (1); a fan noise reduction unit, which comprises sound-absorbing cotton (31) attached to the inner walls of the air inlet and air outlet of the fan (3) at the top of the transformer (1). Each adaptive damping unit comprises a supporting member (22) arranged at the upper end, a connecting rod (23) arranged at the lower end, a magnetorheological damper (21) arranged between the supporting member (22) and the connecting rod (23), and a vibration sensor (4) arranged on the transformer shell (11) and electrically connected with the magnetorheological damper (21).

2. The dry-type transformer noise reduction device according to claim 1, wherein: the supporting base (5) comprises a bottom damping assembly, an elastic supporting assembly and a transformer mounting assembly arranged in sequence from bottom to top; the bottom damping assembly comprises a second bottom plate (54) and a plurality of parallel L-shaped steel pipes (56) welded to the lower surface of the second bottom plate (54), and the four corners of the second bottom plate (54) are provided with foot pads (55) connected with the bottom of the rectangular frame (51); the elastic supporting assembly comprises rectangular steel pipes (53) equally spaced and welded to the upper surface of the second bottom plate (54), and each rectangular steel pipe (53) jointly bears a first bottom plate (52); the transformer mounting assembly comprises a transformer (1) fixed to the first bottom plate (52), and the top of the transformer forms a triangular reinforcing structure with the upper frame of the rectangular frame (51) through an obliquely arranged connecting pipe (57).

3. The dry-type transformer noise reduction device according to claim 2, wherein: the L-shaped steel pipes (56) are arranged in at least two, and the height of the vertical section corresponds to the height of the foot pad; the foot pad (55) adopts a rubber-metal composite structure, and the bottom surface is provided with anti-skid lines.

4. The dry-type transformer noise reduction device according to claim 2, wherein: the rectangular steel pipes (53) are arranged in at least two; an elastic pad is arranged between the first bottom plate (52) and the rectangular steel pipes (53).

5. The dry-type transformer noise reduction device according to claim 2, wherein: the connecting pipe (57) forms an angle of 45-60° with the horizontal plane; the vertex connecting position of the triangular reinforcing structure is provided with a stress dispersion rib plate, and the thickness of the rib plate is 1.2-1.5 times the wall thickness of the connecting pipe (57).

6. The dry-type transformer noise reduction device according to claim 1, wherein: the top of the magnetorheological damper (21) is connected with the top side wall of the transformer through the supporting member (22), and the bottom is fixedly connected to the upper surface of the second bottom plate (54); the central axis of the connecting rod (23) forms a spatial angle of 30-60° with the piston movement direction of the magnetorheological damper (21); the side wall of the magnetorheological damper (21) is connected with the lateral extension of the rectangular steel pipe (53) through an adjustable universal joint.

7. The dry-type transformer noise reduction device according to claim 1, characterized in that: The annular damping sleeve comprises, from inside to outside, a metal constraint layer (15) which is a stainless steel layer, a wave-shaped shock-absorbing layer (14) made of polyurethane-based composite material, and flow guide grooves (13) which are helically distributed on the outer surface of the wave-shaped shock-absorbing layer (14).

8. The dry-type transformer noise reduction device of claim 1, wherein, Further comprising an intelligent control system electrically connected to the vibration sensor (4), the magnetorheological damper (21), and the cooling fan (3).

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