Transformer oil tank magnetic shielding device

Abstract

The utility model discloses a transformer oil tank magnetic shielding device which comprises an installation plate arranged on the side wall of a transformer tank, an embedding groove is formed in the installation plate, a magnetic shielding device is installed in the embedding groove, the magnetic shielding device is composed of a plurality of steel plates, the thickness of each steel plate is 0.5-0.8 cm, the width of each steel plate is 1-2 cm, and the thickness of each steel plate is 0.5-0.8 cm. A fastening plate is further arranged outside the caulking groove, locking bolts are connected to the two sides of the fastening plate, and the fastening plate is connected with the mounting plate through the locking bolts. According to the scheme, the stability of the magnetic shielding device can be improved, and maintenance is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic shielding technology, specifically relating to a magnetic shielding device for a transformer oil tank. Background Technology

[0002] As a large power installation, especially for oil-immersed power transformers, when the distance between the coil and the tank wall of an oil-immersed power transformer is small, it is necessary to install oil tank magnetic shielding to reduce the heat generated by the tank wall and ensure the safe operation of the transformer. Therefore, the oil tank magnetic shielding device used for transformers is an important transformer component. In the existing oil tank magnetic shielding devices used for transformers, four layers of insulating materials are generally used, with two layers on the front and two layers on the back, wrapped with silicon steel sheets.

[0003] Chinese Patent Application No. 2019207174286 discloses a magnetic shielding structure for a transformer tank, including a tank wall, studs, a magnetic shield, an inner insulating paperboard, an insulating tube, and an outer insulating paperboard. The tank wall has mounting holes, through which the studs pass and are fixedly connected to the tank wall. The insulating tube is detachably connected to the studs and is sleeved on the studs. The inner insulating paperboard is detachably connected to the insulating tube and sleeved on the insulating tube, located near the tank wall. The outer insulating paperboard is detachably connected to the insulating tube and sleeved on the insulating tube, located away from the tank wall. The magnetic shield is located between the outer and inner insulating paperboards, and a detachable nut is provided on the side of the studs away from the tank wall.

[0004] The above-mentioned solution reduces the amount of insulating components used and has the advantages of low manufacturing cost, convenient installation and disassembly, and simplified installation process. However, this magnetic shielding structure often involves mounting several large-area steel plates on the box wall. When these large-area steel plates are stacked, stress concentration is easily formed at the stacking point due to their large area, resulting in structural instability, easy shaking, and affecting the magnetic shielding effect. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a magnetic shielding device for a transformer tank, comprising an mounting plate disposed on the side wall of the transformer tank. The mounting plate has a groove in which a magnetic shield is installed. The magnetic shield is composed of several steel plates, each with a thickness of 0.5-0.8 cm and a width of 1-2 cm. A fastening plate is also provided outside the groove, with locking bolts connected to both sides of the fastening plate. The fastening plate is connected to the mounting plate via the locking bolts.

[0006] Preferably, there are four slots in total, and each slot contains 12 steel plates to form a magnetic shield. A fixing plate is installed on the outside of the magnetic shield. The fixing plate has a square structure and is fitted onto the part of the magnetic shield that protrudes from the slot.

[0007] Preferably, there is a gap between each magnetic shield, and the fastening plate has a partition that is embedded in the gap.

[0008] Preferably, the locking bolt includes a head and a shank, the shank having an external thread and an axial groove. The mounting plate has a locking part and an inner cavity, the locking part having a bolt hole. A fixing plate is connected to the outer side of the locking part, and a fixing shaft is connected to the side of the fixing plate in a vertical direction. A first limiting block and a second limiting block are provided on both sides of the fixing shaft in a vertical direction on the side of the fixing plate. The first limiting block is vertically arranged, and the second limiting block is inclined relative to the first limiting block. A stop plate is rotatably provided on the fixing shaft. The bottom of the stop plate has a beveled structure. A limiting spring is provided on the second limiting block, and the limiting spring is connected to the lower side of the stop plate.

[0009] Preferably, a snap-fit ​​element is provided through the outside of the fixed shaft.

[0010] The advantages of this utility model are:

[0011] 1. This solution utilizes a magnetic shield composed of vertically stacked small steel plates to effectively shield the magnetic field generated by the transformer box, reducing electromagnetic interference to the surrounding environment. Simultaneously, the vertically stacked steel plates form a tighter contact in the stacking direction, resulting in better vertical stability of the overall structure, reducing swaying and ensuring effective magnetic shielding.

[0012] 2. Due to the small size of the small steel plates in this solution, they are more cost-effective to maintain. If a small steel plate is damaged or fails, it can be replaced individually without replacing the entire magnetic shielding structure.

[0013] 3. In this design, the locking bolt engages with the locking bolt hole in the mounting plate via its external thread. When the locking bolt is turned clockwise for tightening, the tightening process is smooth and unobstructed. Once the locking bolt reaches the predetermined position and is locked, the stop plate, due to the limiting action of the first and second limit blocks, will engage with the axial groove of the locking bolt, effectively preventing counterclockwise rotation and thus avoiding loosening. This design provides reliable locking and anti-loosening performance. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the present utility model.

[0015] Figure 2 This is an exploded structural diagram of the present invention.

[0016] Figure 3 This is a structural diagram of the locking bolt of this utility model.

[0017] Figure 4 This is a diagram showing the rotating state of the locking bolt of this utility model.

[0018] Figure 5 This is a cross-sectional view of the locking bolt of this utility model.

[0019] In the diagram: 1 Mounting plate, 2 Embedded groove, 3 Magnetic shield, 4 Fastening plate, 5 Locking bolt, 6 Fixing plate, 7 Spacing, 8 Partition, 9 Head, 10 Rod, 11 External thread, 12 Axial groove, 13 Locking part, 14 Inner cavity, 15 Bolt hole, 16 Connecting plate, 17 Fixed shaft, 18 First limit block, 19 Second limit block, 20 Stop plate, 21 Limiting spring, 22 Snap-fit ​​component. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., 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 utility model 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 utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Simultaneously, when an component is referred to as "fixed to" or "equipped on" another component, it can be directly on the other component or may have an intervening component present. When an component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present. When an component is referred to as "fixedly connected to" another component, it can be a common fixed connection method such as welding, bolting, or gluing. In short, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Example 1, such as Figure 1-2As shown, a magnetic shielding device for a transformer tank includes a mounting plate 1 installed on the side wall of the transformer tank. The mounting plate 1 has slots 2, in which magnetic shields 3 are installed. Each magnetic shield 3 is composed of several steel plates, each 0.6 cm thick and 2 cm wide. Each magnetic shield 3 consists of 12 steel plates stacked longitudinally. There are four slots 2 on the side wall of the tank, each containing 12 steel plates. The magnetic shield 3, composed of small steel plates stacked longitudinally, effectively shields the magnetic field generated by the transformer tank, reducing electromagnetic interference to the surrounding environment. The longitudinally stacked small steel plates form a tighter contact in the stacking direction, resulting in better vertical stability of the overall structure. Furthermore, due to the small size of the steel plates, maintenance and replacement are easier. If a small steel plate is damaged or fails, it can be replaced individually without replacing the entire magnetic shielding structure.

[0024] The outer side of the groove 2 is also equipped with a fastening plate 4, with locking bolts 5 connected to both sides of the fastening plate 4. The fastening plate 4 is connected to the mounting plate 1 through the locking bolts 5. After the steel plates are stacked in the groove 2, the outer top of the magnetic shield 3 can be fixed by fixing the fastening plate 4 to the mounting plate 1. There are three fastening plates 4 in total, at the top, middle, and bottom. The fastening plate 4 is tightly connected to the mounting plate 1 through the locking bolts 5, providing an additional fixing point for the magnetic shield 3. This design not only enhances the stability of the magnetic shield 3 on the mounting plate 1, but also prevents it from loosening or falling off during long-term use. At the same time, by tightly fixing the magnetic shield 3 to the mounting plate 1, the possibility of magnetic field leakage is reduced, thereby improving the overall magnetic shielding performance.

[0025] A fixing plate 6, which is square in structure, is mounted on the outside of the magnetic shield 3, fitting over the portion of the magnetic shield 3 that protrudes from the groove 2. A gap 7 is provided between each magnetic shield 3, and a partition 8 is provided on the fastening plate 4, embedded within the gap 7. The fixing plate 6, fitted over the portion of the magnetic shield 3 protruding from the groove 2, provides additional support and fixation, further enhancing the overall structural stability of the magnetic shield 3. This design helps prevent displacement or detachment of the magnetic shield 3 during use, thereby improving equipment safety. The gap 7 between each magnetic shield 3 reduces interaction between them, lowering magnetic field interference. This design helps optimize the magnetic shielding effect, allowing each magnetic shield 3 to better perform its shielding function. The partition 8 placed within the gap 7 further enhances the tightness.

[0026] Combination Figure 3-5The locking bolt 5 includes a head 9 and a rod 10. The rod 10 is provided with an external thread 11 and an axial groove 12. The mounting plate 1 is provided with a locking part 13 and an inner cavity 14. The locking part 13 is provided with a bolt hole 15. The outer side of the locking part 13 is connected to a connecting plate 16. The side of the connecting plate 16 is vertically connected to a fixed shaft 17. The side of the connecting plate 16 is vertically located on both sides of the fixed shaft 17 and is provided with a first limiting block 18 and a second limiting block 19. The first limiting block 18 is vertically set, and the second limiting block 19 is inclined relative to the first limiting block 18. A stop plate 20 is rotatably provided on the fixed shaft 17. The bottom of the stop plate 20 is a beveled structure. The second limiting block 19 is provided with a limiting spring 21, which is connected to the lower side of the stop plate 20.

[0027] When the locking mechanism is rotated clockwise, the stop plate 20 does not obstruct the locking bolt 5 due to its inclined surface. However, once the locking bolt 5 is tightened, the stop plate 20 cannot rotate counterclockwise due to the limiting action of the first limiting block 18 and the second limiting block 19. It will become stuck in the axial groove 12 of the locking bolt 5, preventing the locking bolt 5 from rotating counterclockwise and thus preventing it from loosening. A snap-fit ​​component 22 is provided through the outside of the fixed shaft 17. The snap-fit ​​component 22 can be a rod, elastic metal wire, or bolt, etc., to prevent the stop plate 20 from falling off. The stop plate 20 can also be removed by unloading the snap-fit ​​component 22.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetic shielding arrangement for a transformer tank, characterized by: The utility model relates to a transformer box magnetic shielding device, including the installation plate (1) set up on the transformer box side wall, the installation plate (1) is set with the recess (2) on, the recess (2) is installed with the magnetic shield (3), the magnetic shield (3) is composed of several steel sheets, the thickness of the steel sheet is 0.5-0.8cm, the width of the steel sheet is 1-2cm, the outside of recess (2) is equipped with the fastening plate (4) still, the both sides of fastening plate (4) are connected with locking bolt (5), and fastening plate (4) is connected with installation plate (1) through locking bolt (5).

2. The transformer tank magnetic shielding arrangement of claim 1, characterized in that: The recess (2) is equipped with four, and 12 steel sheets are arranged in each recess (2) to form a magnetic shield (3), and a fixing plate (6) is arranged outside the magnetic shield (3), the fixing plate (6) is in square structure, and the fixing plate (6) is sleeved with the part of the magnetic shield (3) protruding from the recess (2).

3. The transformer tank magnetic shielding arrangement of claim 2, characterized in that: The spacing (7) is arranged between each magnetic shield (3), the fastening plate (4) is provided with the partition (8), and the partition (8) is embedded in the spacing (7).

4. The transformer tank magnetic shielding arrangement of claim 3, characterized in that: The locking bolt (5) includes a head (9) and a rod (10), the rod (10) is provided with an external thread (11) and an axial groove (12), the installation plate (1) is provided with a locking portion (13) and an inner cavity (14), the locking portion (13) is provided with a bolt hole (15), the outer side of the locking portion (13) is connected with a connecting plate (16), the side of the connecting plate (16) is connected with a fixing shaft (17) in the vertical direction, the side of the connecting plate (16) is provided with a first limiting block (18) and a second limiting block (19) on the two sides of the fixing shaft (17) in the vertical direction, the first limiting block (18) is vertically arranged, the second limiting block (19) is arranged in an inclined manner relative to the first limiting block (18), the fixing shaft (17) is rotatably provided with a stop plate (20), the bottom of the stop plate (20) is in inclined edge structure, the second limiting block (19) is provided with a limiting spring (21), and the limiting spring (21) is connected with the lower side of the stop plate (20).

5. The transformer tank magnetic shielding arrangement of claim 4, characterized in that: The fixing shaft (17) is provided with a clamping piece (22).

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