Magnetic shunt fixing structure for transformer and reactor

Abstract

The utility model relates to transformer and electric reactor technical field, and disclose a kind of magnetic shunt fixing structure of transformer and electric reactor, including shell, shell is provided with the magnetic shunt body of by multiple silicon steel sheet, shell is mainly composed of upper cover and lower cover, further include: the recess that is compatible with the length of magnetic shunt body is set up on upper cover and lower cover, when magnetic shunt body is inserted in recess, form limiting area;The utility model is limited to magnetic shunt body by the recess of upper cover and lower cover, and it is effectively solved that the problem of bolt loosening, poor fixing effect in traditional mechanical clamping type structure, better resistance to vibration and impact when equipment is running, ensure the integrity and stability of magnetic shunt body.

Description

Technical Field

[0001] This utility model relates to the field of transformer and reactor technology, specifically to a magnetic shunt fixing structure for transformers and reactors. Background Technology

[0002] For transformer products, such as power transformers and shunt reactors, a certain amount of leakage flux is generated during the operation of the coil. In addition, the width of the iron core and yoke frame is often smaller than the outer diameter of the coil, making it difficult for the yoke to completely absorb the leakage flux generated by the coil. If the leakage flux problem is not properly solved, a large amount of leakage flux will enter the metal structural components such as the transformer clamps and tank walls, generating significant eddy currents. This will not only lead to a large amount of eddy current loss, reducing the energy utilization rate of the equipment, but also cause local overheating of the structural components, seriously threatening the safe and stable operation of the equipment and shortening its service life. To solve the above problems, magnetic shielding is usually installed at the upper and lower ends of the transformer and reactor coils or on the tank walls. The shielding installed at the upper and lower ends of the coil is generally called magnetic shunt. The main function of the magnetic shunt is to absorb the leakage flux of the coil and guide it into the yoke, thereby reducing the overheating of the metal structural components, reducing stray losses of the transformer or reactor, and ensuring the normal operation of the equipment.

[0003] In order to absorb coil leakage flux more efficiently, the magnetic shunt usually needs to cover the leakage flux area of ​​the coil as much as possible. This makes the length and width of the magnetic shunt often larger. At the same time, in order to save materials and control the overall height of the product, the height of the magnetic shunt is usually smaller, and the whole product has a flat shape.

[0004] In existing technologies, there are various forms of magnetic shunt fixing structures, but they all have certain problems. While integral casting fixing can ensure the integrity of the structure, it is costly, difficult to inspect and maintain later, and has high repair costs. Mechanical clamping structures, on the other hand, will cause the magnetic shunt to shift under long-term operating vibration, resulting in poor fixing effect, degraded magnetic shunt performance, and impaired leakage magnetic absorption capacity, ultimately affecting the stable operation of the equipment. Therefore, we urgently need a magnetic shunt fixing structure for transformers and reactors to solve the above problems. Utility Model Content

[0005] This utility model provides a magnetic shunt fixing structure for transformers and reactors. By setting grooves on the upper and lower covers to limit the magnetic shunt body, and with the fixing of the insulating clamps at both ends and the locking part, it solves the problem of poor fixing effect and deterioration of magnetic shunt performance under long-term vibration of the magnetic shunt body mentioned in the background art. The combined design improves the situation of high cost and difficult maintenance in the later stage.

[0006] This utility model provides the following technical solution: A magnetic shunt fixing structure for a transformer and reactor includes a housing. Inside the housing is a magnetic shunt body composed of multiple sets of silicon steel sheets. The housing mainly consists of an upper cover and a lower cover. It further includes: grooves on both the upper and lower covers that are adapted to the length of the magnetic shunt body, forming a limiting area when the magnetic shunt body is inserted into the grooves; both ends of the upper and lower covers are connected by insulating clamps, which abut against the corresponding sides of the magnetic shunt body when the insulating clamps are located between the upper and lower covers; the insulating clamps and the magnetic shunt body are detachably connected via a locking mechanism.

[0007] As a preferred embodiment of this utility model, both ends of the upper cover and the lower cover are provided with sliding grooves, and both ends of the insulating clamp slide within the corresponding sliding grooves.

[0008] As a preferred embodiment of this utility model, a damping pad is fixedly installed on the inner wall of the slide groove. When the insulating clamp slides in the slide groove, the insulating clamp and the damping pad abut against each other to form an anti-slip zone.

[0009] As a preferred technical solution of this utility model, the locking part includes bolt holes equidistantly opened on two sets of insulating clamps and the magnetic circuit body. When the two sets of insulating clamps and the bolt holes on the magnetic circuit body are coaxial, they are fixed by fastening bolts and nuts and form a locking area.

[0010] As a preferred technical solution of this utility model, the number of bolt holes is at least four sets, and the four sets of bolt holes are arranged at equal intervals along the width direction of the magnetic shunt body.

[0011] As a preferred embodiment of this utility model, the insulating clamp is made of epoxy glass cloth.

[0012] As a preferred embodiment of this utility model, an insulating pad is fixedly installed in the groove. When the magnetic shunt body is located in the groove, the side of the magnetic shunt body abuts against the pad to form an insulating area.

[0013] Compared with the prior art, this utility model provides a magnetic shunt fixing structure for transformers and reactors, which has the following beneficial effects: 1. In the magnetic shunt fixing structure of the transformer and reactor, the magnetic shunt body is limited by the grooves of the upper and lower covers. Combined with the lateral clamping of the insulating plates at both ends and the rigid fixing of the locking part, the problem of easy loosening of bolts and poor fixing effect in the traditional mechanical clamping structure is effectively solved. It can better resist the vibration and impact during equipment operation and ensure the integrity and stability of the magnetic shunt body.

[0014] 2. In the magnetic shunt fixing structure of the transformer and reactor, each component is conveniently assembled through slides, bolts, etc. During later maintenance, the relevant components can be disassembled individually without damaging the overall structure, which reduces the installation difficulty and maintenance cost and solves the defect of cast-in-place structures that are not conducive to maintenance.

[0015] The parts not covered in this device are the same as or can be implemented using existing technologies. This utility model effectively solves the problems of easy loosening of bolts and poor fixing effect in traditional mechanical clamping structures, ensures the integrity and stability of the magnetic shunt body, and solves the problem that the cast-in-place curing structure is not conducive to maintenance. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a front view structural diagram of the present invention; Figure 3 This is a schematic diagram of the insulating clamp structure of this utility model; Figure 4 This is a schematic diagram of the shell structure of this utility model.

[0018] In the diagram: 1. Housing; 2. Magnetic shunt body; 3. Top cover; 4. Bottom cover; 5. Groove; 6. Insulating clamp; 7. Slide groove; 8. Damping pad; 9. Bolt hole; 10. Gasket. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example: Reference Figures 1-4A magnetic shunt fixing structure for a transformer and reactor includes a housing 1. Inside the housing 1, a magnetic shunt body 2 composed of multiple sets of silicon steel sheets is disposed. The housing 1 is mainly composed of an upper cover 3 and a lower cover 4. Here, the thickness of the silicon steel sheets used in the magnetic shunt body 2 is 0.3-0.5mm. In this embodiment, 0.35mm is selected. The surface of the silicon steel sheets is coated with an insulating coating, and an insulating adhesive is coated between adjacent silicon steel sheets. The insulating adhesive is XJ-90 transformer silicon steel sheet end face special adhesive. Adjacent silicon steel sheets are bonded and fixed by the insulating adhesive, which improves the overall integrity of the magnetic shunt body 2. This bonding method can reduce the relative displacement between the sheets.

[0021] It also includes grooves 5 on the upper cover 3 and the lower cover 4 that are adapted to the length of the magnetic shunt body 2. A gasket 10 for insulation is fixedly installed in the groove 5. When the magnetic shunt body 2 is located in the groove 5, the side of the magnetic shunt body 2 abuts against the gasket 10 to form an insulation area. When the magnetic shunt body 2 is inserted into the groove 5, a limiting area is formed.

[0022] In this embodiment, the total length of the stacked silicon steel sheets is 50mm, so the length of the groove 5 is set to 50mm. The gasket 10 in the groove 5 is made of insulating rubber. The gasket 10 can enhance the insulation performance and also play a buffering and protective role for the silicon steel sheets.

[0023] Both ends of the upper cover 3 and the lower cover 4 are connected by an insulating clamp 6. The insulating clamp 6 is made of epoxy glass cloth. In this embodiment, the epoxy glass cloth has high strength and high insulation, which can provide uniform lateral pressure and avoid the grounding risk caused by metal materials. Its size and magnetic shunt body 2 can ensure full clamping. The thickness is 3-5mm, preferably 4mm. The length and width of the insulating clamp 6 are equal to the length and width of the magnetic shunt body 2 to ensure full clamping of the magnetic shunt body 2 and can convert the clamping force of the bolt into surface pressure on the silicon steel sheet.

[0024] Both ends of the upper cover 3 and the lower cover 4 are provided with sliding grooves 7. The two ends of the insulating clamp 6 slide in the corresponding sliding grooves 7. The inner wall of the sliding groove 7 is fixedly installed with a damping pad 8. When the insulating clamp 6 slides in the sliding groove 7, the insulating clamp 6 and the damping pad 8 abut against each other to form an anti-slip area. When the insulating clamp 6 is located in the upper cover 3 and the lower cover 4, the insulating clamp 6 abuts against the corresponding side of the magnetic shunt body 2.

[0025] Here, the inner wall of the slide groove 7 is provided with a wear-resistant coating. The wear-resistant coating is a ceramic coating, which can reduce the friction loss between the insulating clamp 6 and the slide groove 7 and extend the service life. The insulating clamp 6 is attached to the magnetic shunt body 2 from both sides, and its two ends slide into the slide groove 7 at the end of the housing 1. The lateral displacement of the insulating clamp 6 is limited by the cooperation of the slide groove 7 and the damping pad 8. At the same time, the insulating clamp 6 forms lateral pressure on the magnetic shunt body 2, which restricts its horizontal shaking.

[0026] The insulating clamp 6 and the magnetic circuit body 2 are detachably connected by a locking part. The locking part includes bolt holes 9 that are equidistantly opened on the two sets of insulating clamps 6 and the magnetic circuit body 2. The number of bolt holes 9 is at least four sets. The four sets of bolt holes 9 are equidistantly arranged along the width direction of the magnetic circuit body 2. When the two sets of insulating clamps 6 and the bolt holes 9 on the magnetic circuit body 2 are coaxial, they are fixed by fastening bolts and nuts and a locking area is formed.

[0027] Here, the distance between two adjacent bolt holes 9 is preferably 60mm. The four sets of bolt holes 9 are precision stamped or laser drilled, and combined with the overall drilling process after the silicon steel sheets are stacked, which can ensure the alignment accuracy of the holes and the error is small. The diameter of the bolt hole 9 is 0.5-1mm larger than the diameter of the fastening bolt. In this embodiment, the diameter of the bolt hole 9 is 0.8mm larger than the diameter of the fastening bolt. This setting facilitates the installation of the fastening bolt, can eliminate processing errors, and is suitable for filling with insulating glue, etc.

[0028] Furthermore, the fastening bolts pass through the corresponding bolt holes 9. The fastening bolts are high-strength insulated bolts, and their length is greater than the total length of the two sets of insulating clamps 6 and the magnetic shunt body 2. The upper insulating nut of the fastening bolt adopts a self-locking thread design. With the wear-resistant coating on the thread surface, the anti-loosening ability of the thread pair can be significantly improved. The two sets of insulating clamps 6 and the magnetic shunt body 2 are fixedly connected by the cooperation of the fastening bolts and insulating nuts. The setting of multiple bolt holes 9 can evenly distribute the total preload, reduce the force on a single bolt, and ensure the firmness of the connection.

[0029] In other embodiments, the outer surface of the magnetic shunt body 2 is also wound with a non-woven tape. The non-woven tape is made of polyester non-woven glass fiber adhesive tape, and the number of winding layers is 2-4 layers, preferably 3 layers. The overlap between two adjacent turns of non-woven tape is 1 / 3-1 / 2 bandwidth, preferably 1 / 2 bandwidth, until the entire outer surface of the magnetic shunt body 2 is covered, completing one layer of winding. Then, the second layer of winding is performed, with the winding direction being the same as the first layer, maintaining the same tension and overlap width. This process is repeated to complete the required number of winding layers. After winding, the non-woven tape generates circumferential pressure, which not only constrains the radial deformation of the silicon steel sheet, but also binds the fastening bolts to the insulating clamp 6 through friction, reducing the axial movement of the fastening bolts during vibration, and further enhancing the integrity and mechanical strength of the magnetic shunt body 2.

[0030] In this invention, the magnetic shunt body 2 is composed of multiple stacked silicon steel sheets, bonded together with XJ-90 insulating adhesive to form a whole. It is then inserted into the grooves 5 of the upper cover 3 and lower cover 4, abutting against the insulating gasket 10, thus achieving initial vertical positioning of the magnetic shunt body 2. Two sets of insulating clamps 6 are then attached to the magnetic shunt body 2 from both sides, with their ends sliding into the grooves 7 at the ends of the housing 1. The grooves 7, in conjunction with the damping pads 8, restrict the lateral displacement of the insulating clamps 6. Simultaneously, the insulating clamps 6 form a... Lateral pressure constrains its horizontal swaying. The fastening bolts pass through the coaxial bolt holes 9 of the insulating clamp 6 and the magnetic shunt body 2. With the self-locking thread design of the insulating nut, the lateral pressure is converted into a long-lasting preload, making the magnetic shunt body 2, the insulating clamp 6 and the housing 1 form a whole. The non-woven tape mentioned in the instruction manual can also be wrapped around the outer surface of the magnetic shunt body 2 to further enhance the bonding force between the silicon steel sheets. At the same time, the friction force weakens the impact of vibration on the fastening bolts, ultimately achieving stable operation of the magnetic shunt body 2 during use.

[0031] Components not described in detail in this article are existing technologies.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications 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.

Claims

1. A magnetic shunt fixing structure for a transformer and a reactor, characterized in that, The housing includes a casing (1), inside which is a magnetic shunt body (2) composed of multiple sets of silicon steel sheets. The casing (1) is mainly composed of an upper cover (3) and a lower cover (4), and also includes: The upper cover (3) and the lower cover (4) are both provided with grooves (5) that are adapted to the length of the magnetic circuit body (2). When the magnetic circuit body (2) is inserted into the groove (5), a limiting area is formed. Both ends of the upper cover (3) and the lower cover (4) are connected by an insulating clamp (6). When the insulating clamp (6) is located in the upper cover (3) and the lower cover (4), the insulating clamp (6) abuts against the corresponding side of the magnetic shunt body (2). The insulating clamp (6) and the magnetic shunt body (2) are detached and connected via a locking part.

2. The magnetic shunt fixing structure for a transformer and reactor according to claim 1, characterized in that, Both ends of the upper cover (3) and the lower cover (4) are provided with sliding grooves (7), and both ends of the insulating clamp (6) slide in the corresponding sliding grooves (7).

3. The magnetic shunt fixing structure for a transformer and reactor according to claim 2, characterized in that, The inner wall of the slide groove (7) is fixedly installed with a damping pad (8). When the insulating clamp (6) slides in the slide groove (7), the insulating clamp (6) and the damping pad (8) abut against each other to form an anti-slip zone.

4. The magnetic shunt fixing structure for a transformer and reactor according to claim 1, characterized in that, The locking part includes bolt holes (9) that are equidistantly opened on two sets of insulating clamps (6) and magnetic circuit body (2). When the two sets of insulating clamps (6) and the bolt holes (9) on the magnetic circuit body (2) are coaxial, they are fixed by fastening bolts and nuts and form a locking area.

5. The magnetic shunt fixing structure for a transformer and reactor according to claim 4, characterized in that, The number of bolt holes (9) is at least four sets, and the four sets of bolt holes (9) are arranged at equal intervals along the width direction of the magnetic shunt body (2).

6. The magnetic shunt fixing structure for a transformer and reactor according to claim 1, characterized in that, The insulating clamp (6) is made of epoxy glass cloth.

7. The magnetic shunt fixing structure for a transformer and reactor according to claim 1, characterized in that, An insulating pad (10) is fixedly installed in the groove (5). When the magnetic shunt body (2) is located in the groove (5), the side of the magnetic shunt body (2) abuts against the pad (10) to form an insulating area.

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