Novel oil tank magnetic shielding structure

Abstract

The utility model relates to the technical field of transformers, in particular to a novel oil tank magnetic shielding structure. According to the technical scheme, a right fixing plate is arranged at the rear end of a left fixing plate, an upper fixing plate is arranged on one side of the left fixing plate and one side of the right fixing plate, a lower fixing plate is arranged on the other side of the left fixing plate and the other side of the right fixing plate, a bottom plate is arranged on one side of the lower fixing plate, a rubber pad is arranged on one side of the bottom plate, and a silicon steel sheet is arranged at the lower end of the rubber pad. A magnetic shielding plate is arranged outside the silicon steel sheet, a welding indicator is arranged outside the magnetic shielding plate, and an oil tank wall is arranged outside the welding indicator. The two ends of the left fixing plate are welded to the lower fixing plate and the upper fixing plate, then a certain number of bottom plates are evenly welded to the inner side of the left fixing plate, and the supporting effect is achieved. Silicon steel sheets are flatly stacked on the inner side of the left fixing plate, and the right fixing plate is used for pressing the silicon steel sheets after the silicon steel sheets are placed, so that obvious gaps are prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field especially relates to a novel oil tank magnetic shielding structure. BACKGROUND

[0002] In the transformer operation process, when the load current flows in the secondary winding, the leakage magnetic flux will be generated in the space where the winding is located. With the increase of the load current, the value of the leakage magnetic flux also increases. The oil tank wall generally adopts ordinary steel material, which will cause eddy current in the tank wall and lead to overheating of the tank wall. The magnetic permeability of silicon steel sheet is much larger than that of ordinary steel, and the leakage magnetic flux will preferentially enter the silicon steel sheet. Therefore, installing the silicon steel sheet with better magnetic conductivity on the oil tank wall as a magnetic shield is an effective measure to reduce the heating of the tank wall.

[0003] The existing magnetic shield installation needs to weld a large number of bent plates on the inner side of the oil tank wall for fixation, which is complicated and time-consuming.

[0004] Therefore, in view of the above-mentioned complicated operation process of the existing magnetic shield installation, which leads to a long time, a novel oil tank magnetic shielding structure can be designed to solve the above-mentioned problems. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings of the existing magnetic shield installation, which needs to weld a large number of bent plates on the inner side of the oil tank wall for fixation, and the operation process is complicated, leading to a long time.

[0006] The technical scheme of the utility model is as follows: a novel oil tank magnetic shielding structure, comprising a left fixed plate, a right fixed plate, an upper fixed plate, a lower fixed plate, a bottom plate, a rubber pad, a silicon steel sheet, an oil tank wall, a magnetic shield plate, and a welding indication point, wherein the rear end of the left fixed plate is provided with the right fixed plate, one side of the left fixed plate and the right fixed plate is provided with the upper fixed plate, the other side of the left fixed plate and the right fixed plate is provided with the lower fixed plate, one side of the lower fixed plate is provided with the bottom plate, one side of the bottom plate is provided with the rubber pad, the lower end of the rubber pad is provided with the silicon steel sheet, the outside of the silicon steel sheet is provided with the magnetic shield plate, the outside of the magnetic shield plate is provided with the welding indication point, and the outside of the welding indication point is provided with the oil tank wall.

[0007] Preferably, the left fixed plate, the right fixed plate, the upper fixed plate, the lower fixed plate, and the bottom plate are arranged as an integral frame, the silicon steel sheet is arranged flat in the frame, the left fixed plate and the right fixed plate are arranged to be pressed, and the rubber pad is arranged on the outside of the bottom plate.

[0008] Preferably, the left fixed plate, the right fixed plate, the upper fixed plate, the lower fixed plate, the bottom plate, the rubber pad, and the silicon steel sheet are arranged as an integral whole.

[0009] As preferred, the upper and lower fixed plates are fixedly welded at both ends of the left fixed plate, and the bottom plates are evenly welded to the inner side of the left fixed plate, and the silicon steel sheets are placed flat on the inner side of the left fixed plate.

[0010] As preferred, the silicon steel sheets are placed in a target number, the right fixed plate is arranged to press the silicon steel sheets, both ends of the right fixed plate are welded with the upper and lower fixed plates, the inner side of the right fixed plate is welded with the bottom plates, and the rubber pads are pasted to the back of the bottom plates to form the magnetic shielding plate.

[0011] As preferred, the left and right fixed plates in the magnetic shielding plate are welded to the inner side of the oil tank wall to fix the magnetic shielding plate.

[0012] As preferred, the welding points are arranged on the outer side of the magnetic shielding plate, and the oil tank wall is arranged outside the magnetic shielding plate.

[0013] The utility model discloses the beneficial effect:

[0014] 1. By setting up the left fixed plate both ends and the lower fixed plate and the upper fixed plate weld, then a certain number of bottom plate even welding to the inner side of the left fixed plate, play the supporting role. The silicon steel sheet is placed flat to the inner side of the left fixed plate, after placing, adopt the right fixed plate and press the silicon steel sheet, prevent the appearance obvious gap, then the both ends of the right fixed plate are welded with the upper fixed plate and the lower fixed plate respectively. The rubber pad is pasted to the back of the bottom plate to play the damping effect, after the above steps are completed, the magnetic shielding plate is welded to the inner side of the oil tank wall, and the magnetic shielding structure is convenient and simple, so that the magnetic shielding plate ensures single transportation and saves installation time, improves work efficiency. The fixed plate and the silicon steel sheet are welded to the inner side of the oil tank wall as a whole, so as to reduce the welding of the bent plate and the installation process, reduce the operation process in the process of installing the magnetic shielding plate, facilitate the transportation of the magnetic shielding plate, greatly improve the work efficiency, save time. Overcome the existing magnetic shielding installation, need first in the oil tank wall inner side welding quantity more bent plate, and fixed, its operation process is complicated, leads to the disadvantage of long time. DRAWINGS

[0015] Fig. 1 The novel oil tank magnetic shielding structure three-dimensional structure schematic view of the utility model is shown;

[0016] Fig. 2 The novel oil tank magnetic shielding structure tank wall side schematic view of the utility model is shown;

[0017] Fig. 3 The magnetic shielding plate and the oil tank wall welding point diagram of the utility model is shown;

[0018] Explanation of reference signs: 1, left fixed plate; 2, right fixed plate; 3, upper fixed plate; 4, lower fixed plate; 5, bottom plate; 6, rubber pad; 7, silicon steel sheet; 8, oil tank wall; 9, magnetic shielding plate; 10, welding schematic point. DETAILED DESCRIPTION

[0019] The utility model will be further explained in connection with the drawings and examples.

[0020] Among the existing discovered implementable technologies, oil tank magnetic shielding is a technical means for reducing the influence of external magnetic fields on substances inside the oil tank (such as fuel, lubricating oil, insulating oil, etc.). Its main principle is to use materials with specific electromagnetic properties to change the distribution path of the magnetic field, so that the magnetic field penetrates as little as possible into the internal area of the oil tank.

[0021] I. Magnetic shielding materials

[0022] High permeability material

[0023] Permalloy: It is a nickel-iron alloy with extremely high permeability. For example, in a weak magnetic field environment, its relative permeability can reach tens of thousands or even higher. This means that it can efficiently guide magnetic field lines along itself, like opening a "green channel" for magnetic field lines, thereby reducing the opportunity for magnetic fields to enter the internal area of the oil tank.

[0024] Ferrite material: Ferrite is a metal oxide with ferrimagnetic properties. Its characteristic is high resistivity, and in a high-frequency magnetic field environment, the eddy current loss is small. It can effectively absorb and attenuate the magnetic field, especially in the case of high-frequency electromagnetic signal interference near some small oil tanks of electronic equipment, ferrite magnetic shielding materials can play a good role.

[0025] High saturation magnetization material

[0026] Silicon steel sheet: Silicon steel sheet is a silicon-iron alloy with a relatively low silicon content. It has high saturation magnetization, and can absorb a large amount of magnetic field energy when the external magnetic field is strong. Moreover, the magnetic hysteresis loss of silicon steel sheet is relatively small, which makes it effective in magnetic shielding in alternating magnetic field environments. In the magnetic shielding of large power transformers, silicon steel sheet is one of the commonly used materials, because there may be strong alternating magnetic fields around the transformer.

[0027] II. Common oil tank magnetic shielding structure forms

[0028] Single-layer shielding structure

[0029] This is the simplest form, usually covered with a layer of magnetic shielding material on the outside or inside of the tank. For example, in some small industrial equipment oil tank, only a layer of permalloy sheet wrapped outside the tank. The advantages of this structure is simple, low cost, for the magnetic field strength is low, a single frequency has a certain shielding effect. However, its shielding effectiveness is limited, in the face of complex magnetic field environment (such as strong magnetic field and high frequency magnetic field exist at the same time), may not meet the requirements.

[0030] Multi-layer shielding structure

[0031] Double shielding:

[0032] Generally includes inner and outer layers of shielding. The inner layer can use high permeability material, such as permalloy, for gathering and guiding the magnetic field lines; the outer layer can use high saturation magnetization material, such as silicon steel sheet, for absorbing and dissipating magnetic field energy. For example, in the fuel tank magnetic shielding of aerospace vehicles, the inner layer of permalloy can effectively deal with the weaker but may affect the performance of the fuel magnetic field in space environment, the outer layer of silicon steel sheet can resist the stronger magnetic field generated by the electrical equipment of the aircraft itself.

[0033] Three or more layers of shielding:

[0034] In multi-layer shielding structure, you can also add the middle layer. The middle layer is usually non-magnetic but has good mechanical properties and buffering effect of materials, such as aluminum alloy. For example, a large industrial transformer tank in a complex electromagnetic environment, the three-layer shielding structure from inside to outside is permalloy, aluminum alloy, silicon steel sheet. Permalloy gathers magnetic field lines, aluminum alloy buffers stress and electromagnetic coupling between the inner and outer layers, silicon steel sheet absorbs strong magnetic field energy, such structure can greatly improve the magnetic shielding effectiveness, adapt to a variety of complex magnetic field environment.

[0035] Three, the importance of oil tank magnetic shielding

[0036] Protect the quality of oil

[0037] For fuel, external magnetic field may trigger chemical reactions of some components in the fuel. For example, the magnetic field may accelerate the oxidation process of unsaturated hydrocarbons in the fuel, produce gum and sediment, affect the combustion performance of the fuel. In the automobile fuel tank, good magnetic shielding can reduce the occurrence of such cases, ensure the quality of fuel, improve the combustion efficiency of the engine.

[0038] Ensure normal operation of equipment

[0039] In power transformers, the insulating oil in the oil tank is the key to ensuring the insulation performance and heat dissipation of the transformer. If the external magnetic field interferes with the performance of the insulating oil, it may reduce its insulation strength, cause partial discharge and other problems, and even cause transformer failure. Effective magnetic shielding of the oil tank can prolong the service life of the transformer and ensure the stable operation of the power system.

[0040] IV. Test method for magnetic shielding effectiveness

[0041] Magnetic field strength measurement method

[0042] Using a gauss meter or other magnetic field measuring instrument, measure the magnetic field strength inside and outside the oil tank with and without magnetic shielding structure. By comparing the difference between the two, the magnetic shielding effectiveness can be evaluated. For example, in the case of an external magnetic field strength of 100 gauss, the internal magnetic field strength of the oil tank without magnetic shielding is 30 gauss, and after installing the magnetic shielding structure, the internal magnetic field strength of the oil tank is reduced to 2 gauss. The shielding effectiveness can be evaluated by calculating (30-2) / 30x100%≈93.3%.

[0043] Simulation experiment method

[0044] Build an experimental platform that simulates the actual working environment. Set up various magnetic field sources on the platform, such as electromagnets, high-frequency magnetic field generators, etc., to simulate different types and intensities of magnetic field interference. Place the oil tank with magnetic shielding structure on the platform and monitor the changes in the relevant parameters of the oil in the tank (such as insulation performance, chemical composition changes, etc.) and the magnetic field strength to comprehensively evaluate the effectiveness of the magnetic shielding structure.

[0045] Please refer to Figs. 1-3The utility model provides a kind of embodiment: a novel oil tank magnetic shielding structure, including left fixed plate 1, right fixed plate 2, upper fixed plate 3, lower fixed plate 4, bottom plate 5, rubber pad 6, silicon steel sheet 7, oil tank wall 8, magnetic shielding plate 9, welding schematic point 10, left fixed plate 1 is provided with right fixed plate 2 at rear end portion, left fixed plate 1 and the side of right fixed plate 2 are provided with upper fixed plate 3, the other side of left fixed plate 1 and right fixed plate 2 is provided with lower fixed plate 4, the side of lower fixed plate 4 is provided with bottom plate 5, the side of bottom plate 5 is provided with rubber pad 6, the lower end portion of rubber pad 6 is provided with silicon steel sheet 7, the outside of silicon steel sheet 7 is provided with magnetic shielding plate 9, the outside of magnetic shielding plate 9 is provided with welding schematic point 10, the outside of welding schematic point 10 is provided with oil tank wall 8.Left fixed plate 1, right fixed plate 2, upper fixed plate 3, lower fixed plate 4 and bottom plate 5 are arranged as integral frame, silicon steel sheet 7 is arranged flat in frame, left fixed plate 1 and right fixed plate 2 are arranged to be compact, and rubber pad 6 is arranged on the outside of bottom plate 5.Left fixed plate 1, right fixed plate 2, upper fixed plate 3, lower fixed plate 4, bottom plate 5, rubber pad 6 and silicon steel sheet 7 are arranged as one whole.Both ends of left fixed plate 1 are fixedly welded with upper fixed plate 3 and lower fixed plate 4, and bottom plate 5 is evenly welded to the inside of left fixed plate 1.Silicon steel sheet 7 is placed flat to the inside of left fixed plate 1.Silicon steel sheet 7 is arranged in target quantity, right fixed plate 2 is arranged to compact silicon steel sheet 7, both ends of right fixed plate 2 are welded with upper fixed plate 3 and lower fixed plate 4, the inside of right fixed plate 2 is welded with bottom plate 5, rubber pad 6 is pasted to the back of bottom plate 5, to form magnetic shielding plate 9.Left fixed plate 1 and right fixed plate 2 in magnetic shielding plate 9 are welded to the inside of oil tank wall 8, to fix magnetic shielding plate 9.Welding schematic point 10 is arranged on the outside of magnetic shielding plate 9, and oil tank wall 8 is arranged on the outside of magnetic shielding plate 9.

[0046] When working, first, left fixed plate 1 both ends are welded with lower fixed plate 4 and upper fixed plate 3, then a certain number of bottom plate 5 are evenly welded to the inside of left fixed plate 1, to play a supporting role.Silicon steel sheet 7 is placed flat to the inside of left fixed plate 1, after placement, right fixed plate 2 is used to compact silicon steel sheet 7, to prevent obvious gap, then both ends of right fixed plate 2 are welded with upper fixed plate 3 and lower fixed plate 4 respectively.Rubber pad 6 is pasted to the back of bottom plate 5 to play a damping role, after the above steps are completed, magnetic shielding plate 9 is welded to the inside of oil tank wall 8, this magnetic shielding structure is convenient and simple, makes magnetic shielding plate 9 guarantee single transportation while also saves installation time, improves work efficiency, completes all work.

[0047] Through the above steps, by setting the left fixed plate 1 both ends and the lower fixed plate 4 and the upper fixed plate 3 are welded, then a certain number of bottom plate 5 is evenly welded to the inner side of the left fixed plate 1, play a supporting role. Silicon steel sheet 7 flatly stacked to the inner side of the left fixed plate 1, after the placement, using the right fixed plate 2 will be pressed tightly, prevent the emergence of obvious gap, silicon steel sheet 7, then the two ends of the right fixed plate 2 are welded with the upper fixed plate 3 and the lower fixed plate 4. Rubber pad 6 is pasted to the back of the bottom plate 5 to play a damping effect, after the above steps, the magnetic shielding plate 9 is welded to the inner side of the oil tank wall 8, the magnetic shielding structure is convenient and simple, the magnetic shielding plate 9 ensures single transportation while also saves the installation time, improves the work efficiency. The left fixed plate 1, the right fixed plate 2, the upper fixed plate 3, the lower fixed plate 4, the bottom plate 5 and the silicon steel sheet 7 are welded to the inner side of the oil tank wall 8 as a whole, thereby reducing the welding of the bent plate and the installation process, reducing the operation process in the process of installing the magnetic shielding plate 9, facilitating the transportation of the magnetic shielding plate 9, greatly improving the work efficiency, saving time. Overcome the existing magnetic shielding installation, need to weld a large number of bent plate on the inner side of the oil tank wall 8, and fixed, its operation process is complicated, leading to the time is long, the shortcoming.

[0048] The above describes the embodiments of the present application in detail in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A novel magnetic shielding structure for fuel tank, comprising a left fixed plate (1), characterized in that: The right fixed plate (2), the upper fixed plate (3), the lower fixed plate (4), the bottom plate (5), the rubber pad (6), the silicon steel sheet (7), the oil tank wall (8), the magnetic shielding plate (9), and the welding schematic point (10) are further included.

2. A novel magnetic shielding structure for fuel tank as claimed in claim 1, wherein: The left fixed plate (1), the right fixed plate (2), the upper fixed plate (3), the lower fixed plate (4), and the bottom plate (5) are arranged as an integral frame, and the silicon steel sheet (7) is arranged flat in the frame.

3. The novel magnetic shielding structure for fuel tank according to claim 1, wherein: The left fixed plate (1), the right fixed plate (2), the upper fixed plate (3), the lower fixed plate (4), the bottom plate (5), the rubber pad (6), and the silicon steel sheet (7) are arranged as an integral frame.

4. The novel magnetic shielding structure for fuel tank according to claim 1, wherein: The left fixed plate (1), the right fixed plate (2), the upper fixed plate (3), the lower fixed plate (4), and the bottom plate (5) are arranged as an integral frame, and the silicon steel sheet (7) is arranged flat in the frame.

5. The novel magnetic shielding structure for fuel tank according to claim 1, wherein: The left fixed plate (1), the right fixed plate (2), the upper fixed plate (3), the lower fixed plate (4), and the bottom plate (5) are arranged as an integral frame, and the silicon steel sheet (7) is arranged flat in the frame.

6. A novel magnetic shielding structure for fuel tank as claimed in claim 1, wherein: The left fixed plate (1), the right fixed plate (2), the upper fixed plate (3), the lower fixed plate (4), and the bottom plate (5) are arranged as an integral frame, and the silicon steel sheet (7) is arranged flat in the frame.

7. The novel magnetic shielding structure for fuel tank of claim 1, wherein: The left fixed plate (1) and the right fixed plate (2) in the magnetic shielding plate (9) are welded to the inner side of the oil tank wall (8), and the magnetic shielding plate (9) is fixed. The welding schematic point (10) is arranged on the outer side of the magnetic shielding plate (9), and the oil tank wall (8) is arranged on the outer side of the magnetic shielding plate (9).

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