An anti-vibration device for a transformer or reactor manifold

Abstract

The utility model relates to transformer and electric reactor technical field discloses a kind of anti-vibration device and its testing method for transformer or electric reactor manifold. Anti-vibration device includes metal hose, flange, manifold;Manifold is connected by flange or metal hose sealingly, manifold lower is equipped with multiple support columns spaced along its axial direction, and the top of support column is detachably connected with manifold by U-shaped clamp. Test method includes working condition parameter calibration, structure detection, cold and hot cycle aging, composite vibration test and failure determination, and vibration acceleration and strain data are monitored by multidimensional sensing. The utility model is optimized by composite metal hose and support layout design, combined with whole-process test verification, so that the anti-vibration performance of manifold connection is greatly improved, the service life is significantly prolonged, and the failure rate of oil leakage, cracks and other faults caused by vibration of equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of transformer and reactor technology, specifically an anti-vibration device for transformer or reactor couplings. Background Technology

[0002] In power systems, transformers and reactors are critical equipment that require long-term stable operation. However, under long-term operating conditions, due to the combined effects of various complex factors such as electromagnetic vibration and equipment impact, the connection points of the connecting pipes will be subjected to significant vibration forces. If the connecting pipes are not secure enough, local resonance can easily occur at the connection points when subjected to continuous vibration forces. Local resonance will cause the vibration amplitude at this location to continuously increase, accelerating material fatigue wear. Over time, micro-cracks will gradually appear at the connection points. These cracks will continue to propagate under continuous vibration stress, eventually leading to the rupture and oil leakage of the connecting pipe system, seriously affecting the operational safety and reliability of the equipment.

[0003] Therefore, in order to improve the vibration resistance of transformer or reactor connection points and reduce the failure rate, it is urgent to optimize the connection method and establish a sound testing method to scientifically evaluate its vibration resistance, thereby improving the product quality of transformers or reactors. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a vibration-damping device for transformer or reactor connecting pipes, aiming to solve the problems of poor vibration-damping performance and easy fatigue failure of existing connecting pipe connections.

[0005] To solve the aforementioned technical problem, the present invention adopts the following technical solution: a vibration-damping device for transformer or reactor connecting pipes, comprising a metal flexible hose, a flange, and connecting pipes. Connecting pipes in areas of concentrated vibration stress are connected to the flange via the metal flexible hose, while other connecting pipes are connected via the flange. Multiple support columns are spaced apart along the axial direction of the connecting pipes below them. One end of each support column is detachably connected to the connecting pipe via a clamp, and the other end is connected to the transformer or reactor body. The metal flexible hose includes a corrugated section, a braided wire mesh, and a clamp. The braided wire mesh wraps around the outside of the corrugated section, and the clamp is fitted onto both ends of the braided wire mesh and fits snugly against the ends of the corrugated section. In this device, the metal flexible hose provides a flexible connection between the connecting pipes, while the support columns are rigidly connected to the transformer / reactor body. The components work together to achieve the dual functions of "flexible compensation + rigid support." The metal flexible hose forms a composite protective structure of "corrugated section-braided wire mesh-clamp," which can absorb vibration displacement.

[0006] Furthermore, the corrugated joint is an annular stainless steel corrugated pipe, and the corrugation depth D and the connecting pipe diameter d satisfy the relationship D=0.15×d+1mm, and the number of corrugations N and the connecting pipe diameter d satisfy the relationship N=d / 10+2, where N is an integer.

[0007] Furthermore, the woven wire mesh is made of stainless steel wire with a weaving angle of 45°±5°, a weaving density of 4.7-7.1 mesh / cm, and a wire mesh thickness of 0.8-1.5mm.

[0008] Furthermore, the clamp is a semi-circular stainless steel structure with a thickness of 2-4mm. The inner wall of the clamp is fitted with woven wire mesh, and both ends of the clamp are sealed to the end of the corrugated section and the edge of the flange by argon arc welding.

[0009] Furthermore, the bottom of the support column is rigidly connected to the transformer or reactor body by bolts, and the top is provided with a threaded hole; the end of the clamp is provided with an external thread, and the external thread is screwed into the threaded hole at the top of the support column to a depth of ≥20mm.

[0010] Furthermore, the spacing between the support columns is 15-25 times the diameter of the connecting pipe. Each connecting pipe section with a length ≥1m should be equipped with at least 2 support columns, and the number of support columns increases by 1 for every 1.5m increase in the length of the connecting pipe.

[0011] Furthermore, a rubber buffer layer is provided at the contact point between the clamp and the connecting pipe.

[0012] The beneficial effects of this invention are as follows: Firstly, it significantly improves vibration resistance. Under 1000kV reactor operating conditions, the maximum vibration amplitude of the sample is 35.6 m / s², only 11.4% of that of traditional structures, representing a 7.8-fold improvement in vibration resistance. The average strain is 178-210 με, far lower than the traditional 652-720 με, thus avoiding early material fatigue. Secondly, it boasts strong reliability and adaptability. After a 100-hour fatigue test, no cracks or leaks were observed. It is compatible with 10-1000kV equipment, and parameters can be dynamically adjusted to cope with different operating conditions. Thirdly, the testing is scientific, covering aging and composite vibration tests, with multi-dimensional monitoring to provide accurate data for product optimization and effectively reduce equipment oil leaks and cracking failures. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the vibration damping device. Figure 2 This is a schematic diagram of the structure of a flexible metal hose; In the diagram: 1. Metal flexible hose, 2. Flange, 3. Connecting pipe, 4. Clamp, 5. Support column, 7. Corrugated pipe, 8. Braided wire mesh, 9. Clamping clamp. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] Example 1 This embodiment discloses an anti-vibration device for transformer or reactor couplings, such as... Figure 1 As shown, the system includes a flexible metal hose 1, a flange 2, and a connecting pipe 3. Connecting pipe 3 in the vibration stress concentration area is connected to flange 2 via flexible metal hose 1, while other connecting pipes are connected via flange 2. In this embodiment, the vibration stress concentration area is the connection point between the vertical and horizontal connecting pipes. A flexible metal hose is installed 100mm to the left of the vertical connecting pipe. Multiple support columns 5 are spaced apart along the axial direction of connecting pipe 3 below it. One end of each support column 5 is detachably connected to connecting pipe 3 via a U-shaped clamp 4, and the other end is connected to the transformer or reactor body. Figure 2 As shown, the flexible metal hose 1 includes a corrugated section 7, a braided wire mesh 8, and a clamp 9. The braided wire mesh 8 wraps around the outside of the corrugated section 7, and the clamp 9 is fitted onto both ends of the braided wire mesh 8 and fits snugly against the ends of the corrugated section 7. In this device, the flexible metal hose 1 provides a flexible connection between the connecting pipes 3, while the support column 5 is rigidly connected to the transformer / reactor body. The components work together to achieve the dual functions of "flexible compensation + rigid support." The flexible metal hose 1 forms a composite protective structure of "corrugated section-braided wire mesh-clamp," which can absorb vibration displacement.

[0016] The corrugated joint 7 is an annular stainless steel corrugated pipe. The corrugation depth D and the connecting pipe diameter d satisfy the relationship D = 0.15 × d + 1 mm, and the number of corrugations N and the connecting pipe diameter d satisfy the relationship N = d / 10 + 2, where N is an integer. Specifically, the corrugation depth is 5-15 mm, and the number of corrugations is 8-15. The core function of the corrugated pipe 7 is to absorb displacement through corrugation deformation. Its flexibility is positively correlated with the corrugation depth (the greater the corrugation depth, the lower the stiffness and the better the flexibility; however, when the corrugation depth is too large, it will exceed the material forming limit, resulting in uneven wall thickness reduction, cracking, or wrinkling). To ensure that the corrugation depth increases proportionally with the pipe diameter and to avoid insufficient corrugation depth in large-diameter pipes and excessive corrugation depth in small-diameter pipes, based on past experience, the formula is: Corrugation depth (D) = 0.15 × connecting pipe diameter (d) + 1mm; where the constant term 1mm is the "minimum effective corrugation depth" of the corrugated pipe, ensuring the integrity of the corrugated structure even with extremely small pipe diameters and avoiding abrupt changes in stiffness caused by excessive proximity of corrugation peaks and troughs. The axial stiffness of the corrugated pipe 7 is approximately inversely proportional to the number of corrugations (at the same pipe diameter and corrugation depth, the more corrugations, the lower the stiffness and the stronger the flexibility). Based on past experience, the formula is: Number of corrugations (N) = connecting pipe diameter (d) / 10 + 2 (N is an integer); where the coefficient d / 10 is an empirical value based on "corrugation number adaptation per unit length," for example, N=8 when d=60mm, and N=15 when d=130mm. This ratio allows large-diameter pipes to compensate for the increased stiffness due to the increased diameter by increasing the corrugation number, while small-diameter pipes can avoid insufficient stiffness by reducing the corrugation number. The constant term +2 sets the minimum corrugation number baseline. This corrugated pipe achieves a precise balance between flexibility and strength through parameter matching.

[0017] The woven wire mesh 8 is made of stainless steel wire with a weaving angle of 45°±5°, a weaving density of 4.7-7.1 meshes / cm, and a wire mesh thickness of 0.8-1.5mm. The clamp 9 is a semi-circular stainless steel structure with a thickness of 2-4mm. The inner wall of the clamp 9 is fitted to the woven wire mesh 8, and both ends of the clamp 9 are sealed to the ends of the corrugated section 7 and the edge of the flange 2 by argon arc welding. The corrugated section 7, woven wire mesh 8, and clamp 9 are all made of 316 stainless steel. The use of 316 stainless steel gives the overall structure excellent corrosion resistance and fatigue resistance, making it suitable for the complex operating environment of transformers and reactors.

[0018] Support columns 5 are spaced apart along the axial direction of the connecting pipe 3. U-shaped clamps 4 restrict the radial vibration of the connecting pipe 3, ensuring the natural frequency of the support system avoids the 50-400Hz equipment vibration frequency band. Support columns 5 are made of low-alloy high-strength steel, with their bottoms rigidly connected to the transformer or reactor body via bolts, and threaded holes at the top. The clamps 4 have external threads at their ends, with the external threads screwed into the threaded holes at the top of the support column 5 to a depth ≥20mm.

[0019] The spacing of the support columns 5 is 15-25 times the diameter of the connecting pipe 3. Each connecting pipe 3 with a length ≥1m should be equipped with at least 2 support columns. The number of support columns 5 increases by 1 for every 1.5m increase in the length of the connecting pipe 3. The vibration stress is dispersed through the reasonable layout of the support columns 5.

[0020] In this embodiment, the connecting pipe 3 is made of ordinary carbon steel Q235B, with an outer diameter of 60mm, a wall thickness of 4mm, and a total length of 2920mm. It is an oil-filled pressure pipeline with a design working pressure of 0.6MPa. The end of the connecting pipe 3 is fixed to the flange 2 by argon arc welding, and the welded joint has passed ultrasonic flaw detection. The corrugated section 7 is a 316 stainless steel annular thin-walled corrugated pipe with a thickness of 0.4mm. Based on the connecting pipe diameter of 60mm and the formula, the corrugation depth D=0.15×60+1mm=10mm, and the number of corrugations N=60 / 10+2=8, which meets the requirements of 5-15mm depth and 8-15 corrugations. The braided wire mesh 8 is made of 316 stainless steel wire with a braiding angle of 45°, a braiding density of 15 meshes / inch (5.9 meshes / cm), and a wire mesh thickness of 1.2mm. It is tightly wrapped around the outside of the corrugated section 7. The clamp 9 is a semi-circular structure made of 316 stainless steel, 3mm thick, with its inner wall fitted to the braided wire mesh 8. Both ends are sealed to the ends of the corrugated section 7 and the edge of the flange 2 via argon arc welding, with a weld width ≥5mm and no undercut defects. The flange 2 is made of 316 stainless steel, 160mm in diameter and 18mm thick, and is connected to the end flange of the connecting pipe and the metal hose clamp by four M20 bolts. The bolt preload torque is controlled at 250N·m, and an oil-resistant rubber gasket is added at the connection to achieve a seal. The support column 5 is made of low-alloy high-strength steel Q345B, 510mm high, 48mm outer diameter, and 3.5mm wall thickness; its bottom is rigidly connected to the reactor body by four M16 bolts, with a bolt insertion depth ≥30mm. The U-shaped clamp 4 is made of low-alloy high-strength steel Q345B, with an M14 external thread at the end. The engagement depth with the threaded hole at the top of the support column 5 is 25mm. A rubber buffer layer is added to the inside of the clamp 4 to avoid rigid contact with the connecting pipe. After assembly, the clamping force on the connecting pipe is ≥5kN. Through the above structural design, the flexibility compensation of the metal hose 1 can reach ±10mm, and the natural frequency of the support system avoids the equipment vibration frequency band of 50-400Hz. While meeting the requirements of flexible pipeline connection, it effectively weakens vibration transmission and reduces fatigue loss of connection parts.

[0021] In other embodiments, the braiding parameters of the metal hose 1, the specifications of the clamps 9, and the number and spacing of the support columns 5 can be dynamically adjusted according to the pipe diameter, medium pressure (0.1-1.0MPa), and vibration conditions to adapt to transformers and reactors of different capacity levels.

[0022] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model.

Claims

1. A vibration-damping device for transformer or reactor couplings, characterized in that: It includes metal hoses, flanges, and connecting pipes. Connecting pipes in areas of vibration stress concentration are connected by metal hoses and flanges, while other connecting pipes are connected by flanges. Multiple support columns are arranged at intervals along the axial direction of the connecting pipes. One end of the support column is detachably connected to the connecting pipe by a clamp, and the other end of the support column is connected to the transformer or reactor body. The metal hose includes a corrugated joint, a braided wire mesh, and a clamp. The braided wire mesh is wrapped around the outside of the corrugated joint, and the clamp is fitted on both ends of the braided wire mesh and fits against the ends of the corrugated joint.

2. The vibration-damping device for transformer or reactor couplings according to claim 1, characterized in that: The corrugated joint is an annular stainless steel corrugated pipe. The corrugation depth D and the connecting pipe diameter d satisfy the relationship D=0.15×d+1mm. The number of corrugations N and the connecting pipe diameter d satisfy the relationship N=d / 10+2, where N is an integer.

3. The vibration-damping device for transformer or reactor couplings according to claim 1, characterized in that: The woven wire mesh is made of stainless steel wire with a weaving angle of 45°±5°, a weaving density of 4.7-7.1 mesh / cm, and a wire mesh thickness of 0.8-1.5mm.

4. The vibration-damping device for transformer or reactor couplings according to claim 1, characterized in that: The clamp is a semi-circular stainless steel structure with a thickness of 2-4mm. The inner wall of the clamp is fitted with woven wire mesh, and the two ends of the clamp are sealed to the end of the corrugated section and the edge of the flange by argon arc welding.

5. The vibration-damping device for transformer or reactor couplings according to claim 1, characterized in that: The bottom of the support column is rigidly connected to the transformer or reactor body by bolts, and the top is provided with a threaded hole; the end of the clamp is provided with an external thread, and the external thread is screwed into the threaded hole at the top of the support column to a depth of ≥20mm.

6. The vibration-damping device for transformer or reactor couplings according to claim 1, characterized in that: The spacing between the support columns is 15-25 times the diameter of the connecting pipe. Each connecting pipe with a length of ≥1m should be equipped with at least 2 support columns. The number of support columns increases by 1 for every 1.5m increase in the length of the connecting pipe.

7. The vibration-damping device for transformer or reactor couplings according to claim 1, characterized in that: A rubber buffer layer is provided at the contact point between the clamp and the connecting pipe.

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