Oil-immersed transformer shock-absorbing and noise-reducing structure

Abstract

The application provides an oil-immersed transformer shock absorption and noise reduction structure, and belongs to the technical field of transformers. The oil-immersed transformer shock absorption and noise reduction structure comprises a plurality of buffer devices, the buffer devices are in one-to-one correspondence with pull rods, and the buffer devices are arranged at corresponding first sections and second sections. The buffer device comprises a sleeve, a buffer column and a buffer assembly. The sleeve is coaxially fixed to the end of the first section. The buffer column is coaxially fixed to the end of the second section, and one end of the buffer column is slidably arranged in the sleeve. The buffer assembly is arranged in the sleeve, and is used for buffering the relative movement between the sleeve and the buffer column and attenuating the vibration amplitude between the sleeve and the buffer column. The buffer device can relieve the direct conduction path of vibration in the clamping frame, reduce the diffusion of core vibration to the whole clamping frame, and further reduce the beat vibration noise generated by the rigid transmission of laminations. Meanwhile, the arrangement of the buffer device is beneficial to dispersing the dynamic alternating load borne by the clamping frame and reducing the stress burden of the clamping frame under long-term vibration working conditions.

Description

Technical Field

[0001] This application belongs to the technical field of transformers, and more specifically, relates to a vibration reduction and noise reduction structure for an oil-immersed transformer. Background Technology

[0002] Oil-immersed transformers use insulating oil as the primary insulation medium and rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling, and forced oil circulation.

[0003] An oil-immersed transformer consists of a casing, an iron core, and a clamping frame. The iron core is composed of stacked silicon steel sheets with good magnetic permeability to form a closed magnetic flux path. The clamping frame is used to clamp and fix the stacked silicon steel sheets, and then to the casing through rigid connecting bolts.

[0004] A clamping frame typically includes two upper clamps, two lower clamps, and multiple sets of clamping components. The two upper clamps are clamped opposite each other on the front and rear sides of the top of the iron core, and the two lower clamps are clamped opposite each other on the front and rear sides of the bottom of the iron core. The clamping components include a pull rod and fasteners connected to both ends of the pull rod. Multiple sets of clamping components are respectively arranged between the two upper clamps, between the two lower clamps, and between the upper and lower clamps located on the same side of the iron core, so as to clamp the top and bottom of the iron core from the front and rear respectively, and simultaneously clamp from top to bottom.

[0005] The vibration of existing oil-immersed transformers mainly comes from the magnetostriction and electromagnetic force vibration of the iron core. The core transmission path is as follows: iron core, clamping frame, rigid connecting bolts, shell, air / building foundation.

[0006] Currently, rubber pads are usually only placed at the rigid connection bolts between the clamping frame and the housing to achieve buffering and shock absorption between the clamping frame and the housing. However, the clamping frame and the iron core laminations form a rigid whole, and the magnetostrictive vibration transmitted between the laminations is prone to generating flapping noise and puts too much load on the clamping frame. Summary of the Invention

[0007] The purpose of this application is to provide a vibration reduction and noise reduction structure for an oil-immersed transformer, in order to solve the technical problems existing in the prior art where the clamping frame and the iron core laminations form a rigid whole, magnetostrictive vibration is transmitted between the laminations and easily generates beat noise, and the load on the clamping frame is too large.

[0008] To achieve the above objectives, the technical solution adopted in this application is: to provide a vibration damping and noise reduction structure for an oil-immersed transformer, which is applied to a clamping frame inside the transformer. The clamping frame includes an upper clamp, a lower clamp, and multiple clamping components. Each clamping component includes a pull rod and fasteners connected to both ends of the pull rod. The pull rod includes a first section and a second section that are coaxial and spaced apart. The oil-immersed transformer vibration damping and noise reduction structure includes multiple buffer devices, each of which corresponds to a tie rod and is positioned between the corresponding first and second sections. The buffer device includes: The sleeve is coaxially fixed to the end of the first section; A buffer column, coaxially fixed to the end of the second section, with one end slidably disposed within the sleeve; and A buffer assembly, disposed within the sleeve, is used to buffer the relative movement between the sleeve and the buffer column, and to attenuate the vibration amplitude between them.

[0009] In one possible implementation, based on the above technical solutions, the bushing has a damping cavity filled with insulating oil; the buffer assembly includes: The piston plate is slidably disposed within the damping cavity and fixed to the buffer column; and A metal elastic element is disposed inside the sleeve and outside the damping cavity, and is connected between the sleeve and the buffer column.

[0010] In one possible implementation, based on the above technical solutions, each sleeve has two damping cavities, located at both ends of the sleeve; the buffer assembly has two sets within the sleeve, symmetrically arranged in the middle of the sleeve.

[0011] In one possible implementation, based on the above technical solutions, the inner wall of the sleeve is provided with a passage connecting the two damping cavities, and the connection ports of the passage and the two damping cavities are located on the side of the two piston plates that are close to each other.

[0012] In one possible implementation, based on the above technical solutions, an annular groove is coaxially formed at the middle of the outer circumferential surface of the sleeve, and the annular groove is interrupted at the passageway; the buffer device further includes: A rotating ring is coaxially rotatably disposed within the annular groove, and both end faces of the rotating ring have through holes communicating with the passage; wherein, by adjusting the position of the rotating ring, the overlapping area of ​​the through holes and the passage can be adjusted; and The positioning component is axially slidably sleeved on the sleeve and can be inserted into the rotating ring to position the rotating ring.

[0013] In one possible implementation, based on the above technical solutions, the outer diameter of the rotating ring is larger than the outer diameter of the sleeve, and the end face of the rotating ring protruding from the outer circumferential surface of the sleeve has multiple slots; the positioning component includes: A sliding ring is slidably disposed on the outer circumferential surface of the sleeve along the axial direction of the sleeve; and Multiple locking teeth are fixed to the end face of the sliding ring and are inserted into the multiple locking slots one by one; the locking teeth are equidistantly distributed circumferentially on the sliding ring.

[0014] In one possible implementation, based on the above technical solutions, a set of clamping members is provided at each end of the two upper clamping members; the oil-immersed transformer vibration damping and noise reduction structure further includes: Four connecting plates, respectively disposed at the ends of the two upper clamps, are used for rigid connection with the transformer housing; each of the tie rods passes through the two connecting plates; and Four sets of elastic torsion components correspond one-to-one with the four connecting plates and are connected between the connecting plates and the tie rods; The connecting plate has a torsional degree of freedom relative to the tie rod in any direction through the elastic torsion assembly.

[0015] In one possible implementation, based on the above technical solutions, the elastic torsion component includes: An inner fixing ring is coaxially fixed to the tie rod; An outer fixing ring is coaxially fixed inside the connecting plate and sleeved on the inner fixing ring, with a gap between the outer fixing ring and the inner fixing ring; and An annular torsion member is coaxially connected between the inner fixed ring and the outer fixed ring, and is elastic.

[0016] In one possible implementation, based on the above technical solutions, the annular torsion member includes: Rubber rings, with their inner and outer circumferential surfaces respectively fitted and fixed to the inner fixing ring and the outer fixing ring; and A woven wire mesh is embedded in the rubber ring in a ring shape.

[0017] In conjunction with the above technical solutions, in one possible implementation, the oil-immersed transformer vibration damping and noise reduction structure further includes: A foot, positioned below the clamping frame, is used to support the lower clamping member; and An elastic block is placed between the pad foot and the lower clamp.

[0018] The beneficial effects of the vibration damping and noise reduction structure for an oil-immersed transformer provided in this application are as follows: Compared with the prior art, this application, by dividing the tie rod into two sections and installing corresponding buffer devices, enables controllable relative displacement between the segmented tie rods when the iron core experiences magnetostrictive or electromagnetic vibration. This breaks the completely rigid integral structure formed by the traditional clamping frame and the iron core, helping to alleviate the direct transmission path of vibration within the clamping frame, reducing the diffusion of iron core vibration to the entire clamping frame, and thus reducing the flapping noise caused by rigid transmission of vibration between laminations. Simultaneously, the buffer device can absorb some vibration energy, which helps to disperse the dynamic alternating load borne by the clamping frame, reducing the stress burden on the clamping frame under long-term vibration conditions, and delaying the fatigue aging process of the clamping frame structure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an installation diagram of an oil-immersed transformer vibration damping and noise reduction structure provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the buffer device provided in the embodiments of this application; Figure 3 A cross-sectional view of the buffer device provided in the embodiments of this application; Figure 4 A diagram showing the connection state between the inner passage of the sleeve and the through hole of the rotating ring provided in an embodiment of this application; Figure 5 A cross-sectional view of the connecting plate and the elastic torsion assembly provided in an embodiment of this application; Figure 6 This is a cross-sectional view of an elastic torsion assembly provided in an embodiment of this application.

[0021] The labels for the attached figures are as follows: 1. Clamping frame; 11. Upper clamp; 12. Lower clamp; 13. Clamping component; 131. Pull rod; 132. Fastener; 2. Sleeve; 21. Damping cavity; 22. Passage; 23. Annular groove; 3. Buffer column; 4. Buffer assembly; 41. Insulating oil medium; 42. Piston plate; 43. Metal elastic component; 5. Rotating ring; 51. Through hole; 6. Positioning component; 61. Sliding ring; 62. Clamping tooth; 7. Connecting plate; 8. Elastic torsion assembly; 81. Inner fixing ring; 82. Outer fixing ring; 83. Annular torsion component; 9. Stand on tiptoe; 10. Elastic block. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain this application and are not intended to limit this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] It should be further noted that the accompanying drawings and embodiments of this application mainly describe the concept of this application. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of this application, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0024] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0028] refer to Figure 1 The existing oil-immersed transformer includes a shell, an iron core and a clamping frame 1. The iron core is composed of multiple stacked silicon steel sheets. The clamping frame 1 is used to clamp and fix the stacked silicon steel sheets, and then fix them to the shell by rigid connecting bolts.

[0029] The clamping frame 1 includes two upper clamps 11, two lower clamps 12 and multiple sets of clamping members 13. The two upper clamps 11 are clamped relative to each other on the front and rear sides of the top of the iron core, and the two lower clamps 12 are clamped relative to each other on the front and rear sides of the bottom of the iron core.

[0030] The clamping member 13 includes a pull rod 131 and fasteners 132 connected to both ends of the pull rod 131. The fasteners 132 are fastening nuts threaded to the ends of the pull rod 131. Multiple sets of clamping members 13 are respectively arranged between two upper clamping members 11, between two lower clamping members 12, and between upper clamping members 11 and lower clamping members 12 located on the same side of the iron core, so as to clamp the top and bottom of the iron core from the front and back respectively, and achieve vertical clamping.

[0031] The present application provides a description of a vibration damping and noise reduction structure for an oil-immersed transformer.

[0032] like Figure 1 and Figure 2As shown, one embodiment of this application provides a vibration damping and noise reduction structure for an oil-immersed transformer, which is applied to a clamping frame 1 inside the transformer. Each tie rod 131 includes a first section and a second section that are coaxially spaced apart.

[0033] The vibration damping and noise reduction structure of the oil-immersed transformer includes multiple buffer devices, which correspond one-to-one with the tie rod 131 and are set between the corresponding first and second sections.

[0034] like Figure 2 and Figure 3 As shown, the buffer device includes a sleeve 2, a buffer column 3, and a buffer assembly 4. The sleeve 2 is coaxially fixed to the end of the first section; the buffer column 3 is coaxially fixed to the end of the second section, with one end slidably disposed inside the sleeve 2. The buffer assembly 4 is disposed inside the sleeve 2 and is used to buffer the relative movement between the sleeve 2 and the buffer column 3, and to attenuate the vibration amplitude between them.

[0035] This embodiment provides a vibration reduction and noise reduction structure for an oil-immersed transformer. Compared with the prior art, by dividing the tie rod 131 into two sections and installing corresponding buffer devices, a controllable relative displacement can be generated between the sections of the tie rod 131 when the iron core generates magnetostrictive vibration or electromagnetic force vibration. This breaks the completely rigid integral structure formed by the traditional clamping frame 1 and the iron core, which helps to alleviate the direct transmission path of vibration inside the clamping frame 1, reduce the diffusion of iron core vibration to the entire clamping frame 1, and thus reduce the flapping noise caused by rigid transmission of vibration between laminations.

[0036] Meanwhile, the buffer device can absorb some of the vibration energy, which helps to disperse the dynamic alternating load borne by the clamping frame 1, reduce the stress on the clamping frame 1 under long-term vibration conditions, and delay the fatigue aging process of the clamping frame 1 structure.

[0037] like Figure 3 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The sleeve 2 has a damping cavity 21 inside, and the buffer assembly 4 includes an insulating oil medium 41, a piston plate 42, and a metal elastic element 43.

[0038] Insulating oil medium 41 is filled in the damping cavity 21; piston plate 42 is slidably disposed in the damping cavity 21 and fixed to the buffer column 3, and there is a damping gap between the outer peripheral surface of piston plate 42 and the inner peripheral surface of damping cavity 21.

[0039] The metal elastic element 43 is disposed outside the damping cavity 21 inside the sleeve 2 and connected between the sleeve 2 and the buffer column 3. The metal elastic element 43 can be a disc spring or a wave spring coaxially sleeved on the buffer column 3, and the elastic coefficient of the metal elastic element 43 can be adjusted according to the actual situation.

[0040] The composite buffer assembly 4, which combines insulating oil medium 41 with metal elastic element 43, can simultaneously utilize the viscous damping characteristics of insulating oil and the elastic recovery characteristics of metal elastic element 43 to achieve buffering and shock absorption.

[0041] When the sleeve 2 and the buffer column 3 undergo axial relative displacement, the piston plate 42 slides within the damping cavity 21, causing the insulating oil medium 41 to flow at high speed through the damping gap. The viscous resistance of the oil converts some of the vibration energy into heat energy for energy dissipation. The metal elastic element 43 provides stable axial elastic support, maintains the basic load-bearing stiffness of the buffer device, and simultaneously helps absorb the impact load during vibration.

[0042] Since the insulating oil medium 41 is fully compatible with the working environment inside the transformer, there is no need to introduce other incompatible damping materials. This helps to ensure the insulation performance and operational safety of the transformer and avoids possible chemical reactions between different materials.

[0043] like Figure 3 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: Each sleeve 2 has two damping cavities 21, located at both ends of the sleeve 2 respectively; the buffer assembly 4 has two sets inside the sleeve 2, and is symmetrically arranged in the middle of the sleeve 2.

[0044] Two damping cavities 21 and two corresponding buffer assemblies 4 are set in the sleeve 2, which enable the buffer device to have equivalent buffering and shock absorption capabilities in two opposite axial directions, and adapt to the bidirectional reciprocating relative displacement that the tie rod 131 may generate during the vibration of the iron core.

[0045] Symmetrical structural design helps ensure the uniformity of the buffer device under axial force, avoids buffer performance deviation and structural wear caused by uneven force on one side, and can improve the overall operational stability of the buffer device, so that vibration energy is effectively consumed in both directions of motion.

[0046] like Figures 3 to 4 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The inner wall of the sleeve 2 has a passage 22 connecting the two damping cavities 21. The connection ports of the passage 22 and the two damping cavities 21 are located on the side of the two piston plates 42 that are close to each other. When the buffer column 3 is displaced, part of the insulating oil medium 41 in one of the damping cavities 21 flows through the passage 22 to the other damping cavity 21, and its flow direction is consistent with the displacement direction of the buffer column 3.

[0047] By opening an internal passage 22 connecting the two damping cavities 21 on the inner wall of the bushing 2, when the buffer column 3 drives the piston plate 42 to generate axial displacement, the insulating oil medium 41 in the damping cavity 21 on the pressure side can flow through the passage 22 to the damping cavity 21 on the other side, forming an internal circulation flow of the oil.

[0048] The design of passage 22 helps to dynamically balance the oil pressure in the two damping cavities 21, preventing excessively high instantaneous pressure from being generated in a single damping cavity 21 due to rapid piston movement, which could adversely affect the sealing structure and housing strength of the buffer device. Simultaneously, the flow of oil within passage 22 generates additional viscous damping, extending the damping stroke and further enhancing the overall energy dissipation effect of vibration.

[0049] like Figures 3 to 4 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: An annular groove 23 is coaxially formed at the middle of the outer circumference of the sleeve 2, and the annular groove 23 is cut off at the passage 22; the buffer device also includes a rotating ring 5 and a positioning component 6.

[0050] The rotating ring 5 is coaxially rotatably disposed in the annular groove 23, and both ends of the rotating ring 5 are provided with through holes 51 that connect to the passage 22; wherein, by adjusting the position of the rotating ring 5, the overlapping area of ​​the through holes 51 and the passage 22 can be adjusted.

[0051] The positioning component 6 is axially slidably sleeved on the sleeve 2 and can be axially inserted into the rotating ring 5 to position the rotating ring 5.

[0052] An annular groove 23 is provided on the outer circumference of the bushing 2 and a rotatable rotating ring 5 is installed. By cooperating with the through hole 51 on the rotating ring 5 and the cut-off passage 22 inside the bushing 2, the overlapping area of ​​the through hole 51 and the passage 22 can be changed by rotating the rotating ring 5, thereby adjusting the flow area of ​​the insulating oil medium 41 between the two damping cavities 21, and realizing continuous adjustment of the damping magnitude of the buffer device.

[0053] The positioning component 6 can reliably fix the rotating ring 5, which has been adjusted to the target position, and the bushing 2, maintaining the adjusted damping state. This makes the damping characteristics of the buffer device adjustable on site, and can flexibly adjust the shock absorption effect of the buffer device according to different operating conditions, load conditions and on-site vibration characteristics of the transformer, thereby improving the adaptability of the buffer device to different application scenarios.

[0054] like Figures 2 to 4 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The outer diameter of the rotating ring 5 is larger than the outer diameter of the sleeve 2. The end face of the rotating ring 5 protruding from the outer circumference of the sleeve 2 has multiple slots. The positioning component 6 includes a sliding ring 61 and multiple locking teeth 62.

[0055] The sliding ring 61 is slidably disposed on the outer circumferential surface of the sleeve 2 along the axial direction of the sleeve 2; multiple retaining teeth 62 are fixed to the end face of the sliding ring 61 and are inserted into multiple retaining grooves one by one; the retaining teeth 62 are equidistantly distributed on the sliding ring 61.

[0056] The positioning component 6, which uses a sliding ring 61 and multiple sets of locking teeth 62, can reliably position the rotating ring 5 in the circumference by inserting the locking teeth 62 into the corresponding slots on the end face of the rotating ring 5. This prevents the rotating ring 5 from rotating on its own due to vibration during long-term operation of the transformer, and ensures that the state after damping adjustment can remain stable for a long time.

[0057] The sliding ring 61 slides along the axial direction of the bushing 2, which is relatively simple to operate and can complete the damping adjustment operation without complicated tools. This makes it convenient to adjust the damping parameters of the buffer device during transformer installation, commissioning, or power outage maintenance.

[0058] Multiple equidistant circumferentially distributed locking teeth 62 can evenly distribute the positioning force on the end face of the rotating ring 5, avoid local stress concentration, and improve the overall strength and vibration resistance of the positioning structure.

[0059] like Figure 1 and Figure 5 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: Clamping member 13 is provided at each end of the two upper clamping members 11; the oil-immersed transformer vibration reduction and noise reduction structure also includes four connecting plates 7 and four sets of elastic torsion components 8.

[0060] Four connecting plates 7 are respectively set at the ends of the two upper clamps 11 for rigid connection with the transformer shell; each tie rod 131 passes through the two connecting plates 7; four sets of elastic torsion components 8 correspond one-to-one with the four connecting plates 7 and are connected between the connecting plates 7 and the tie rods 131.

[0061] The connecting plate 7 has a torsional degree of freedom relative to the tie rod 131 in any direction through the elastic torsion assembly 8.

[0062] The elastic torsion assembly 8 enables the originally rigidly connected connecting plate 7 and tie rod 131 to have torsional freedom in any direction. When the iron core generates torsional vibration or is subjected to unbalanced electromagnetic force to generate overturning moment, it allows relative torsional motion between the connecting plate 7 and tie rod 131, instead of directly and rigidly transmitting torsional vibration to the transformer shell, which helps to block the transmission path of torsional vibration to the shell.

[0063] The elastic torsion assembly 8, in conjunction with the horizontally and vertically arranged buffer devices, achieves three-dimensional buffering and vibration reduction of the iron core. At the same time, the connecting plate 7 maintains a rigid connection with the transformer shell, ensuring the basic connection strength between the clamping frame 1 and the shell, maintaining the stability of the iron core's installation position inside the transformer, and preventing excessive overall displacement of the iron core, thus balancing the vibration reduction effect with the structural safety of the transformer operation.

[0064] like Figures 5 to 6 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The elastic torsion assembly 8 includes an inner fixing ring 81, an outer fixing ring 82, and an annular torsion member 83. The inner fixing ring 81 is coaxially fixed to the tie rod 131.

[0065] The outer fixing ring 82 is coaxially fixed inside the connecting plate 7 and sleeved on the inner fixing ring 81, with a gap between the outer fixing ring 82 and the inner fixing ring 81. The annular torsion member 83 is coaxially connected between the inner fixing ring 81 and the outer fixing ring 82 and is elastic.

[0066] The split elastic torsion assembly 8 structure, which combines an inner fixing ring 81, an outer fixing ring 82 and an annular torsion member 83, can realize the relative torsion between the connecting plate 7 and the tie rod 131 through the elastic shear deformation of the annular torsion member 83. At the same time, the inner fixing ring 81 and the outer fixing ring 82 are used to ensure the coaxiality of the connection and the integrity of the structure.

[0067] The annular gap reserved between the inner fixed ring 81 and the outer fixed ring 82 provides sufficient space for the elastic deformation of the annular torsion member 83, avoids rigid interference during deformation, ensures the effective realization of torsional freedom, and can dissipate the energy of torsional vibration through the elastic deformation and internal damping of the annular torsion member 83, further improving the suppression effect on the torsional vibration of the iron core and reducing the sound radiation generated by the torsional vibration of the outer shell.

[0068] like Figure 6 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The annular torsion member 83 includes a rubber ring and a woven wire mesh. The inner and outer circumferential surfaces of the rubber ring are respectively attached and fixed to the inner fixing ring 81 and the outer fixing ring 82; the woven wire mesh is annularly embedded in the rubber ring.

[0069] The rubber ring can be fluororubber, and its specific elastic coefficient can be selected according to the actual situation so that the connecting plate 7 can not only be slightly torn relative to the tie rod 131 due to the vibration of the iron core, but also maintain the connection strength between the connecting plate 7 and the tie rod 131, ensuring the stable connection between the clamping frame 1 and the outer shell.

[0070] The composite annular torsion member 83, formed by embedding woven steel wire mesh inside the rubber ring, can organically combine the viscoelastic damping characteristics of rubber material and the structural reinforcement characteristics of steel wire mesh.

[0071] Rubber rings provide good elastic deformation capacity and damping effect, effectively absorbing energy during torsional vibration; woven wire mesh can significantly enhance the overall tensile strength and fatigue resistance of the annular torsion member 83, extending its service life under long-term alternating torsional loads.

[0072] Meanwhile, the presence of the woven wire mesh can limit the excessive deformation of the rubber ring, ensuring that the elastic torsion assembly 8 has sufficient torsional freedom while maintaining basic connection stiffness, and preventing excessive relative displacement between the connecting plate 7 and the tie rod 131.

[0073] like Figure 1 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The vibration damping and noise reduction structure of the oil-immersed transformer also includes a pad 9 and an elastic block 10. The pad 9 is located below the clamping frame 1 and is used to support the lower clamp 12; the elastic block 10 is placed between the pad 9 and the lower clamp 12. The elastic block 10 can be a rubber block. The pad 9, the elastic block 10 and the lower clamp 12 can be connected and fixed by bolts and nuts.

[0074] An elastic block 10 is set between the pad 9 and the lower clamp 12, which can form an additional vertical buffer and shock absorption layer at the bottom of the clamping frame 1, further absorbing the vibration energy transmitted downward by the iron core and the clamping frame 1, and reducing the transmission of vibration to the bottom foundation of the transformer.

[0075] By combining the bottom buffer design with multiple buffer devices and elastic torsion components 8 on top, a comprehensive vibration reduction system covering multiple dimensions of axial and torsion can be formed, thereby improving the overall vibration reduction and noise reduction effect of the transformer.

[0076] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

[0077] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0078] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

Claims

1. A vibration damping and noise reduction structure for an oil-immersed transformer, characterized in that, A clamping frame (1) is applied in a transformer. The clamping frame (1) includes an upper clamp (11), a lower clamp (12), and a plurality of clamping parts (13). The clamping parts (13) include a pull rod (131) and fasteners (132) connected to both ends of the pull rod (131). The pull rod (131) includes a first section and a second section that are coaxial and spaced apart. The oil-immersed transformer vibration damping and noise reduction structure includes multiple buffer devices, each of which corresponds to a pull rod (131) and is disposed between the corresponding first and second sections; The buffer device includes: The sleeve (2) is coaxially fixed to the end of the first section; A buffer column (3) is coaxially fixed to the end of the second section, and one end is slidably disposed inside the sleeve (2); and A buffer assembly (4) is disposed inside the sleeve (2) to buffer the relative movement between the sleeve (2) and the buffer column (3) and to attenuate the vibration amplitude between them; The sleeve (2) has a damping cavity (21) inside, and the damping cavity (21) is filled with insulating oil medium (41); the buffer assembly (4) includes: The piston plate (42) is slidably disposed within the damping cavity (21) and fixed to the buffer column (3); and A metal elastic element (43) is disposed inside the sleeve (2) and outside the damping cavity (21), and is connected between the sleeve (2) and the buffer column (3); Each sleeve (2) has two damping cavities (21), which are located at both ends of the sleeve (2); the buffer assembly (4) has two sets in the sleeve (2), which are symmetrically arranged in the middle of the sleeve (2); The inner wall of the sleeve (2) is provided with a passage (22) connecting the two damping cavities (21). The connection ports of the passage (22) and the two damping cavities (21) are located on the side of the two piston plates (42) that are close to each other.

2. The vibration damping and noise reduction structure for an oil-immersed transformer as described in claim 1, characterized in that, The sleeve (2) has an annular groove (23) coaxially formed at the middle of its outer circumferential surface, and the annular groove (23) is cut off from the passage (22); the buffer device further includes: A rotating ring (5) is coaxially rotatably disposed within the annular groove (23). Both ends of the rotating ring (5) are provided with through holes (51) communicating with the passage (22). The overlapping area of ​​the through holes (51) and the passage (22) can be adjusted by adjusting the position of the rotating ring (5). The positioning component (6) is axially slidably sleeved on the sleeve (2) and can be inserted into the rotating ring (5) to position the rotating ring (5).

3. The vibration damping and noise reduction structure for an oil-immersed transformer as described in claim 2, characterized in that, The outer diameter of the rotating ring (5) is larger than the outer diameter of the sleeve (2), and the end face of the rotating ring (5) protruding from the outer circumferential surface of the sleeve (2) is provided with multiple slots; the positioning component (6) includes: A sliding ring (61) is slidably disposed on the outer circumferential surface of the sleeve (2) along the axial direction of the sleeve (2); and Multiple teeth (62) are fixed to the end face of the sliding ring (61) and are inserted into the multiple slots one by one; the teeth (62) are equidistantly distributed on the sliding ring (61).

4. The vibration damping and noise reduction structure for an oil-immersed transformer as described in claim 1, characterized in that, The clamping member (13) is provided at each end of the two upper clamping members (11); the oil-immersed transformer vibration reduction and noise reduction structure also includes: Four connecting plates (7) are respectively disposed at the ends of the two upper clamps (11) for rigid connection with the transformer housing; each of the tie rods (131) passes through the two connecting plates (7); and Four sets of elastic torsion components (8) correspond one-to-one with the four connecting plates (7) and are connected between the connecting plates (7) and the tie rod (131); The connecting plate (7) has a torsional degree of freedom relative to the tie rod (131) in any direction through the elastic torsion assembly (8).

5. The vibration damping and noise reduction structure for an oil-immersed transformer as described in claim 4, characterized in that, The elastic torsion assembly (8) includes: The inner fixing ring (81) is coaxially fixed to the tie rod (131); An outer fixing ring (82) is coaxially fixed inside the connecting plate (7) and sleeved on the inner fixing ring (81), with a gap between the outer fixing ring (82) and the inner fixing ring (81); and The annular torsion member (83) is coaxially connected between the inner fixing ring (81) and the outer fixing ring (82) and is elastic.

6. The vibration damping and noise reduction structure for an oil-immersed transformer as described in claim 5, characterized in that, The annular torsion member (83) includes: A rubber ring, with its inner and outer circumferential surfaces respectively attached and fixed to the inner fixing ring (81) and the outer fixing ring (82); and A woven wire mesh is embedded in the rubber ring in a ring shape.

7. The vibration damping and noise reduction structure for an oil-immersed transformer as described in claim 4, characterized in that, The oil-immersed transformer vibration damping and noise reduction structure also includes: A foot (9) is provided below the clamping frame (1) to support the lower clamp (12); and An elastic block (10) is placed between the pad foot (9) and the lower clamp (12).

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