Low-vibration iron core clamp connecting structure
By adopting a low-vibration iron core clamp connection structure in the transformer, using the composite filling material of rubber plate and cardboard, the elastically cast positioning bowl structure and damped positioning nail structure, the problem of vibration of the transformer core and coil is solved, and the stability and reliability of the transformer are improved.
Patent Information
- Application Number
- CN202421631113.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-11
AI Technical Summary
During operation, the core and coil vibrate due to electromagnetic force and mechanical vibrations, resulting in noise, loose structure, wear and damage, affecting the performance and life of the transformer.
The low-vibration iron core clamp connection structure is adopted, including the positioning bowl structure, the damped positioning nail structure, the upper clamp foot and the lower clamp foot. Through the composite filling material of rubber plate and cardboard and the elastically cast positioning bowl structure and the damped positioning nail structure, the mechanical properties of the transformer are enhanced and vibration transmission is reduced.
It significantly reduces the vibration of the transformer core and coil, improves the stability and reliability of the transformer, and provides a more reliable guarantee for the safe operation of the power system.
Smart Images
Figure CN222927294U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of transformer manufacturing, and particularly relates to a low-vibration core clamp connection structure. Background Technique
[0002] In the power system, the transformer plays a core role in the conversion and transmission of electrical energy. The stability and reliability of the transformer operation are crucial for the safe operation of the entire power network. However, during the operation of the transformer, it is often affected by various factors such as electromagnetic force and mechanical vibration, among which the core vibration and coil vibration are particularly significant. These vibrations not only generate noise and affect the surrounding environment, but may also cause loosening, wear or even damage to the internal structure of the transformer, seriously affecting the performance and life of the transformer.
[0003] The traditional transformer core clamp is usually rigidly connected to the coil pressing plate and the tank cover. This design has limited effect in suppressing vibration. Although some designs have tried to reduce vibration by adjusting the structural layout, increasing internal supports, etc., there are still some deficiencies. For example, the rigid connection structure is prone to stress concentration problems when subjected to vibration shocks, resulting in structural damage. Summary of the Invention
[0004] In order to overcome these technical problems, in recent years, researchers have begun to explore new materials and structural designs to reduce the vibration of the transformer core and coil. Especially with the rapid development of material science and structural design technology, more possibilities have been provided for the innovation of the transformer body structure. For example, the application of elastic materials, damping structures and composite materials has provided new ideas for reducing transformer vibration.
[0005] In this context, the utility model proposes a low-vibration core clamp connection structure, which makes a technical improvement to the existing connection structure between the core clamp and the coil pressing plate and the tank cover. The technical solution adopted by the utility model is as follows:
[0006] Low-vibration iron core clamp connection structure, including a positioning bowl structure, a damping positioning pin structure, upper clamp feet and lower clamp feet. A positioning bowl structure and a damping positioning pin structure are respectively arranged at the connection between the upper iron core clamp and the tank cover. A lower clamp foot is arranged at the connection between the lower coil pressing plate and the lower iron core clamp, and an upper clamp foot is arranged at the connection between the upper coil pressing plate and the upper iron core clamp; rubber plates and cardboard are filled inside the upper clamp feet and the lower clamp feet, and springs are drilled and placed in the rubber plates; the positioning bowl structure includes a positioning bowl body and a first positioning member. The positioning bowl body is welded above the upper iron core clamp. A layer of rubber plate is laid inside the positioning bowl body, a layer of cardboard is laid above the rubber plate, and a first positioning member made of laminated wood is placed above the cardboard. The first positioning member is a cylindrical structure with a closed lower end. A spring is sleeved on the outer periphery of the steel column positioning structure under the tank cover and installed in the first positioning member, and epoxy resin is filled in the first positioning member; the damping positioning pin structure includes a second positioning member, a positioning pin and a positioning rod. A positioning groove is opened on the lower surface of the cover plate on the tank cover. The upper part of the positioning groove is filled with cardboard and rubber plates. Double-layer laminated wood second positioning members are filled around the positioning groove. The upper end of the positioning rod is installed in the second positioning member. An inner hole is opened at the center of the top of the positioning pin welded above the upper iron core clamp, and the lower part of the positioning rod is inserted into the inner hole of the positioning pin.
[0007] Preferably, the ingredients of the epoxy resin are 52% epoxy resin E44, 26% 400-mesh silica powder, 18% polyamide 650 curing agent, and 4% triethylenetetramine curing agent.
[0008] Preferably, rectangular pad foot bosses are integrally formed on the upper surface of the upper coil pressing plate and the lower surface of the lower coil pressing plate. The size and position of the pad foot bosses are matched with the fixed connecting plate. Grooves are opened in the pad foot bosses, and rubber plates and cardboard are filled inside the grooves. Springs are drilled and placed in the rubber plates.
[0009] Preferably, a flat washer is installed on the upper part of the positioning rod.
[0010] Preferably, the upper iron core clamp includes two parallel long steel plates, and the two long steel plates are connected into one body through three connecting steel plates one in the middle and two connecting steel plates two at both ends. The connecting steel plates one and the connecting steel plates two are rectangular plate-like structures with convex steps at both ends. Screw through holes are opened on the convex steps, and internal threaded holes corresponding to the screw through holes are opened on the long steel plates.
[0011] Preferably, the connecting steel plate one is horizontally installed with the convex step facing downwards, and the connecting steel plate two is vertically installed with the convex step facing outwards.
[0012] Preferably, four fixed connecting plates extending outwards are integrally formed on the outer side of each long strip steel plate. Reinforcing ribs are arranged between the fixed connecting plates and the long strip steel plate. Two fixed through holes are opened at the end of the fixed connecting plate, and fixed threaded holes corresponding to the fixed through holes are opened on the coil upper pressing plate.
[0013] Advantages of the present utility model:
[0014] The present utility model adopts a composite filling material of a rubber plate + a cardboard, and achieves the energy dissipation and vibration reduction effect through the shear effect between the two. By adopting an elastic casting positioning bowl structure and a damping positioning nail structure, the reliable mechanical performance of the transformer is enhanced, the transmission of the vibration of the transformer iron core and coil through the core clamping piece and the oil tank cover is effectively reduced, the vibration of the iron core and coil during the operation of the transformer is significantly reduced, the stability and reliability of the transformer are improved, and a more reliable guarantee is provided for the safe operation of the power system. Description of the drawings
[0015] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some specific embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings belonging to the protection scope of this application can also be obtained based on these drawings.
[0016] Figure 1 is the main connection view of the core clamping piece, the pressing plate and the oil tank cover in the embodiment of the present utility model;
[0017] Figure 2 is Figure 1 the top view after removing the oil tank cover;
[0018] Figure 3 is the structural schematic diagram of the upper clamping piece foot pad in the embodiment of the present utility model;
[0019] Figure 4 is the schematic diagram of the positioning bowl structure in the embodiment of the present utility model;
[0020] Figure 5 is the schematic diagram of the damping positioning nail structure in the embodiment of the present utility model;
[0021] Among them, 1. fuel tank cover, 2. upper clamping piece of iron core, 3. upper pressing plate of coil, 4. lower pressing plate of coil, 5. lower clamping piece of iron core, 6. positioning bowl structure, 7. positioning pin, 8. long strip steel plate, 9. connecting steel plate one, 10. connecting steel plate two, 11. foot pad boss, 12. nitrile rubber plate, 13. NOMEX paper board, 14. spring, 15. positioning bowl body, 16. positioning part one, 17. cover plate, 18. positioning part two, 19. positioning rod, 20. flat washer, 21. fixed connecting plate, 22. steel column positioning structure. Detailed implementation mode
[0022] The following further illustrates the present utility model through examples in conjunction with the attached drawings. The specific implementation process is as follows:
[0023] In the transformer body structure, it usually includes a fuel tank and coils, coil pressing plates, iron core clamping pieces, etc. located in the fuel tank. As Figure 1 . 2 shown, for the low-vibration iron core clamping piece connection structure, there are two upper and two lower iron core clamping pieces. The iron core clamping pieces include the upper clamping piece 2 of the iron core and the lower clamping piece 5 of the iron core with similar structures. The upper clamping piece 2 of the iron core includes two parallel long strip steel plates 8. The two long strip steel plates 8 are connected into one body through three connecting steel plates one 9 in the middle and two connecting steel plates two 10 at both ends. The connecting steel plates one 9 and the connecting steel plates two 10 are rectangular plate-like structures with convex steps at both ends. Screw through holes are opened on the convex steps, and internal threaded holes corresponding to the screw through holes are opened on the long strip steel plates 8. The long strip steel plates 8, the connecting steel plates one 9, and the connecting steel plates two 10 are fixedly connected into one body structure through connecting screws, forming the upper clamping piece 2 of the iron core. The connecting steel plate one 9 is horizontally installed with the convex step facing downwards, and the connecting steel plate two 10 is vertically installed with the convex step facing outwards. Bolt holes are reserved on the upper clamping piece 2 of the iron core and the lower clamping piece 5 of the iron core respectively, and the bolt holes are used to fix the upper and lower yokes of the iron core. Four elastic casting positioning bowl structures 6 and four positioning pins 7 are evenly and fixedly arranged on the upper surface of the upper clamping piece 2 of the iron core. Two positioning bowl structures 6 and two positioning pins 7 are arranged on each long strip steel plate 8. The positioning pin 7 is located outside the positioning bowl structure 6, and above the positioning bowl structure 6 and the positioning pin 7 is the fuel tank cover 1.
[0024] Between the lower clamping piece 5 of the iron core and the upper clamping piece 2 of the iron core, a lower coil pressing plate 4, a coil, and an upper coil pressing plate 3 are sequentially installed from bottom to top. The upper surface of the upper coil pressing plate 3 is connected to the lower part of the upper clamping piece 2 of the iron core through eight upper clamping piece foot pads, and the lower surface of the lower coil pressing plate 4 is connected to the upper part of the lower clamping piece 5 of the iron core through eight lower clamping piece foot pads. The upper clamping piece foot pads and the lower clamping piece foot pads have the same structure and opposite directions. Four fixing connecting plates 21 extending outward are integrally formed on the outer side surface of each long strip steel plate 8. A reinforcing rib is provided between the fixing connecting plate 21 and the long strip steel plate 8 to improve its mechanical strength. Two fixing through holes are opened at the end of the fixing connecting plate 21, and fixing threaded holes corresponding to the fixing through holes are opened on the upper coil pressing plate 3. The upper clamping piece 2 of the iron core and the upper coil pressing plate 3 are fixedly connected into one body by screwing a screw through the fixing through hole and into the fixing threaded hole.
[0025] As Figure 3 shown, the material of the upper coil pressing plate 3 is laminated wood. A rectangular foot pad boss 11 is integrally formed on the upper surface of the upper coil pressing plate 3. The foot pad boss 11 is arranged below the fixing connecting plate 21 and avoids the two fixing through holes. The size and position of the foot pad boss 11 are matched with the fixing connecting plate 21. A groove is opened on the upper surface of the foot pad boss. The groove is filled with a composite of a nitrile rubber sheet 12 and a NOMEX paper board 13 (in the figure, the nitrile rubber sheet 12 is filled on the left side and the NOMEX paper board 13 is filled on the right side). The shear effect between the two is used to achieve the effect of energy dissipation and vibration reduction. High-strength springs 14 are drilled and placed in the nitrile rubber sheet 12. The nitrile rubber sheet 12 made of rubber material and the springs 14 made of metal material rub against each other during vibration to dissipate energy, achieving the effect of damping and vibration reduction, and reducing the vibration of the iron core and the coil from being transmitted to the upper clamping piece 2 of the iron core and the tank cover 1 through rigid connection.
[0026] As Figure 4As shown in the figure, the positioning bowl structure 10 with elastic pouring includes a positioning bowl body 15 with an upper opening and a lower seal. The positioning bowl body 15 is made of rigid material. The bottom of the positioning bowl body 15 is welded to the upper clamping piece 2 of the iron core. The position of the positioning bowl body 15 corresponds to the steel column positioning structure 22 under the fuel tank cover 1. A layer of nitrile rubber sheet 12 is laid inside the positioning bowl body 15. A layer of NOMEX paperboard 13 is laid above the nitrile rubber sheet 12. A positioning member one 16 made of laminated wood is placed above the NOMEX paperboard 13. The positioning member one 16 is a cylindrical structure with a closed lower end. Epoxy resin is filled in the positioning member one 16. A high-strength spring 14 is sleeved on the outer periphery of the steel column positioning structure 22 under the fuel tank cover 1 and installed in the positioning member one 16. After the epoxy resin dries quickly and is fixed, the fixation and positioning of the upper clamping piece 2 of the iron core and the fuel tank cover 1 are realized. After the epoxy resin ingredients are placed, they are stirred evenly and waited to cure. The ingredients of the epoxy resin are 52% epoxy resin E44, 26% 400-mesh silica powder, 18% polyamide 650 curing agent, and 4% triethylenetetramine curing agent. The positioning bowl structure 10 is immersed in high-temperature transformer oil for a long time. The utility model increases the ratio of silica powder in the epoxy resin ingredients. As an inorganic material with high hardness and good stability, increasing the ratio of silica powder can enhance the wear resistance and corrosion resistance of the epoxy resin and extend the service life.
[0027] As Figure 5 shown, the cover plate 17 is an inherent component on the fuel tank cover 1. A positioning groove is opened on the lower surface of the cover plate 17. The upper part of the positioning groove is filled with NOMEX paperboard 13 and nitrile rubber 12 as a composite material to form a damping and vibration reduction structure. The periphery of the positioning groove is filled with a double-layer laminated wood positioning member two 18. The upper end of the positioning rod 19 is fixedly installed in the positioning member two 18. The outer periphery of the positioning rod 19 closely fits the inner wall of the positioning member two 18. A flat washer 20 is installed on the upper part of the positioning rod 19. An inner hole is opened at the central position of the upper part of the positioning nail 7 welded to the upper surface of the upper clamping piece 2 of the iron core. The lower part of the positioning rod 19 is matched with the inner hole of the positioning nail 7. The lower part of the positioning rod 19 is inserted into the inner hole of the positioning nail 7, so as to connect the fuel tank cover 1 and the upper clamping piece 2 of the iron core. The nitrile rubber 12 and NOMEX paperboard 13 in the positioning groove of the cover plate 17 can prevent the vibration of the iron core and the coil from being transmitted to the fuel tank cover 1 through the upper clamping piece 2 of the iron core.
[0028] Finally, it should be noted that the above embodiments are only specific implementation manners of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the technical field can modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features within the technical scope disclosed by the present utility model; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model.
Claims
1. Low vibration core clamp connection structure, characterized in that: It includes a positioning bowl structure, a damping positioning nail structure, an upper clamping foot and a lower clamping foot. The positioning bowl structure and the damping positioning nail structure are respectively arranged at the connection between the upper clamp of the iron core and the oil tank cover. The lower clamping foot is arranged at the connection between the lower pressure plate of the coil and the lower clamp of the iron core, and the upper clamping foot is arranged at the connection between the upper pressure plate of the coil and the upper clamp of the iron core. The upper clamping foot and the lower clamping foot are filled with rubber plates and cardboard, and holes are drilled in the rubber plates and springs are placed. The positioning bowl structure includes a positioning bowl body and a positioning piece. The positioning bowl body is welded above the upper clamp of the iron core, a layer of rubber plate is laid inside the positioning bowl body, a layer of cardboard is laid above the rubber plate, and a layer of cardboard is laid above the cardboard. A positioning piece 1 made of laminated wood is placed, and the positioning piece 1 is a cylindrical structure with a closed lower end. The outer peripheral sleeve spring of the steel column positioning structure under the fuel tank cover is installed in the positioning piece 1, and the positioning piece 1 is filled with epoxy resin; the damping positioning nail structure includes a positioning piece 2, a positioning nail and a positioning rod. A positioning groove is provided on the lower surface of the cover plate on the fuel tank cover, and the upper part of the positioning groove is filled with cardboard and rubber plate. The positioning groove is surrounded by a double-layer positioning piece 2 made of laminated wood, and the upper end of the positioning rod is installed in the positioning piece 2. An inner hole is provided at the center of the top of the positioning nail welded on the clamp above the iron core, and the lower part of the positioning rod is inserted into the inner hole of the positioning nail.
2. The low vibration core clamp connection structure according to claim 1, characterized in that: A rectangular footing boss is integrally formed on the upper surface of the coil upper pressing plate and the lower surface of the coil lower pressing plate. The size and position of the footing boss match the fixed connecting plate. A groove is opened in the footing boss. The groove is filled with rubber sheet and cardboard. A hole is drilled in the rubber sheet and a spring is placed.
3. The low vibration core clamp connection structure according to claim 1, characterized in that: A flat washer is installed on the upper part of the positioning rod.
4. The low vibration core clamp connection structure according to claim 1, characterized in that: The core upper clamp includes two parallel long steel plates, which are connected into one by three connecting steel plates one in the middle and two connecting steel plates two at both ends. The connecting steel plate one and the connecting steel plate two are rectangular plate structures with convex steps at both ends, and screw holes are opened on the convex steps, and internal threaded holes corresponding to the screw holes are opened on the long steel plates.
5. The low vibration core clamp connection structure according to claim 4, characterized in that: The connecting steel plate 1 is installed horizontally with the convex step facing downward, and the connecting steel plate 2 is installed vertically with the convex step facing outward.
6. The low-vibration core clamp connection structure according to claim 5, characterized in that: The outer side surface of each long steel plate is integrally formed with four fixed connecting plates extending outward, reinforcing ribs are arranged between the fixed connecting plates and the long steel plates, two fixed through holes are arranged at the ends of the fixed connecting plates, and fixed threaded holes corresponding to the fixed through holes are arranged on the coil upper pressure plate.