Large power transformer iron core cushion block fixing structure

Abstract

The utility model relates to the field of transformers, in particular to an iron core cushion block fixing structure of a large power transformer, and adopts the technical scheme that the iron core cushion block fixing structure of the large power transformer comprises a tight supporting cushion block, an adjusting paperboard, an iron core supporting plate, a supporting plate fastening bolt, an iron core lamination and a contraction band, the supporting cushion block and the adjusting paperboard are bound together through the contraction band to form a cushion block assembly, the cushion block assembly is arranged between the iron core supporting plate and the iron core lamination, the supporting cushion block is provided with a positioning hole in the position corresponding to the supporting plate fastening bolt, and the supporting plate fastening bolt can be screwed into the supporting cushion block after being lengthened. The positioning holes are formed in the positions, corresponding to the supporting plate fastening bolts, of the tight supporting cushion blocks, the supporting plate fastening bolts are lengthened and screwed into the tight supporting cushion blocks, in other words, bidirectional constraint is applied to the longitudinal direction and the transverse direction of the tight supporting cushion blocks at the same time, and it is guaranteed that the tight supporting cushion blocks cannot loosen or fall off.

Description

TECHNICAL FIELD

[0001] The utility model belongs to transformer field, concretely relates to a large -scale power transformer core cushion block fixed structure. BACKGROUND

[0002] The fixed structure of the large -scale power transformer core cushion block is the key design for ensuring the stability of the transformer core and reducing noise and vibration, and the core cushion block is usually used to fix the various parts of the transformer core together to avoid the vibration, displacement and noise of the core caused by the current and magnetic field changes.

[0003] In order to prevent the core lamination from loosening and shifting, a supporting cushion block is placed between the support plate and the core lamination of the large -scale power transformer at the core support plate, and some adjusting paperboards are also provided due to the existence of manufacturing tolerance, the supporting cushion block and the adjusting paperboard are bound together through the shrinkable belt, the longitudinal space between the support plate and the core lamination is completely filled by adjusting the number of adjusting paperboards and multiple trial fittings, the supporting cushion block is pressed tightly by the support plate, and finally the core lamination is supported tightly to prevent the core lamination from loosening and shifting, but the constraint on the supporting cushion block in the above structure is only realized by the pressing force of the support plate on the longitudinal space, and the transverse constraint on the supporting cushion block is lacked, and in actual production, the supporting cushion block often loosens and falls off due to the incomplete filling of the longitudinal space or the shrinkage of the supporting cushion block after the drying of the body.

[0004] Therefore, in view of the problem that the supporting cushion block in the fixed structure of the traditional transformer core cushion block is prone to loosening and falling off, a large -scale power transformer core cushion block fixed structure is developed, the transverse constraint on the supporting cushion block is increased, that is, the constraint is applied to the longitudinal and transverse directions of the supporting cushion block, so that even if the longitudinal space constraint fails, the supporting cushion block will not loosen and fall off, thereby solving the problem that the above structure is prone to loosening and falling off. UTILITY MODEL CONTENTS

[0005] In order to overcome the problem that the supporting cushion block in the fixed structure of the traditional transformer core cushion block is prone to loosening and falling off.

[0006] The technical scheme of the utility model is as follows: a large -scale power transformer core cushion block fixed structure, including supporting cushion block, adjusting paperboard, core support plate, support plate fastening bolt, core lamination and shrinkable belt, the supporting cushion block and the adjusting paperboard are bound together through the shrinkable belt to form a cushion block assembly, and the cushion block assembly is arranged between the core support plate and the core lamination, the supporting cushion block is provided with a positioning hole at the corresponding position of the support plate fastening bolt, and the support plate fastening bolt can be screwed into the supporting cushion block after being lengthened.

[0007] Preferably, the core support plate is divided into two groups distributed upward and downward, and the inner wall of the core support plate is provided with the cushion block assembly formed by binding the supporting cushion block and the adjusting paperboard together through the shrinkable belt.

[0008] As preferred, the support plate fastening bolts are arranged in several groups symmetrically distributed in front and back, and the support plate fastening bolts pass through the iron core support plate, the adjusting paper board and the shrinkable belt and are installed in the support pad.

[0009] As preferred, the adjusting paper board is arranged at the end of the support pad away from each other, and the support pad and the adjusting paper board are bound together by the shrinkable belt to form the pad assembly arranged in several groups.

[0010] As preferred, a group of the support pad and the adjusting paper board bound together by the shrinkable belt to form the pad assembly corresponds to a group of the support plate fastening bolts.

[0011] As preferred, the end of the support pad close to each other is attached to the upper and lower ends of the iron core laminations, and the outer wall of the support pad and the adjusting paper board bound together by the shrinkable belt to form the pad assembly is attached to the inner wall of the iron core support plate.

[0012] As preferred, the upper and lower ends of the iron core laminations are arranged in two groups of the iron core support plate respectively, and the outer wall of the iron core laminations is attached to the inner wall of the iron core support plate.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1. By opening positioning holes in the support pad at the corresponding positions of the support plate fastening bolts, the support plate fastening bolts are lengthened and screwed into the support pad, so that bidirectional constraints are simultaneously applied to the longitudinal and transverse directions of the support pad to prevent the support pad from loosening and falling off.

[0015] 2. By opening positioning holes in the support pad at the corresponding positions of the support plate fastening bolts, it is also convenient for the user to screw the support plate fastening bolts into the support pad. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a front view of a large power transformer iron core pad fixing structure.

[0017] Fig. 2 It is a side view of a large power transformer iron core pad fixing structure.

[0018] Fig. 3 It is a top view of a large power transformer iron core pad fixing structure.

[0019] Explanation of reference signs: 1 - support pad, 2 - adjusting paper board, 3 - iron core support plate, 4 - support plate fastening bolt, 5 - iron core lamination, 6 - shrinkable belt. DETAILED DESCRIPTION

[0020] The fixing structure of large power transformer core pads is the key design to ensure the stability of the transformer core and reduce noise and vibration. Core pads are usually used to fix the various parts of the transformer core together, avoiding core vibration, displacement and noise caused by current and magnetic field changes. Here is a common design idea for core pad fixing structure:

[0021] 1. Pad material selection

[0022] Material: usually choose high-strength, high-temperature-resistant, anti-vibration materials such as steel, alloy steel, spring steel, etc. In addition, the surface of the core pad can be covered with a layer of shock-absorbing material (such as rubber or composite material) to reduce vibration and noise, size: the size and shape of the pad are usually determined according to the structure of the transformer core and the rated power of the transformer. The shape of the core is usually rectangular or ring-shaped, and the pad design needs to match it.

[0023] 2. Fixing structure design

[0024] Pad positioning pins or holes: to ensure the correct positioning and fixing of the pad in the transformer core, positioning pins or holes are usually designed on the core and pad. These pins ensure that the pad does not shift during the operation of the transformer, bolt fixation: bolt holes are designed on the edges or middle of the pad, and the pad is firmly fixed in the corresponding position of the core by bolts. Using high-strength bolts can avoid the loosening of the pad due to vibration during the operation of the transformer, spring pad or elastic element: in some designs, springs or other elastic elements may be added to reduce the slight vibration of the core during operation, further improving the stability of the transformer and reducing noise.

[0025] 3. Shock-absorbing design of fixing structure

[0026] Rubber pad: a layer of rubber pad is added between the pad and the core to absorb the energy caused by electromagnetic vibration and mechanical vibration. Rubber material has good shock-absorbing performance and can effectively reduce the vibration transmitted to the outside, spring support: spring support structure is designed at the support points of the pad, which can adapt to the changes of the stress of the core, avoid stress concentration and improve the anti-vibration ability of the transformer.

[0027] 4. Structure fastening and stability

[0028] Welding or heat treatment: in some cases, in order to improve the strength of the fixing structure, welding technology can be used to fix the pad and the core together. In addition, the pad after heat treatment can maintain good performance in long-term high-temperature working environment, anti-loose design: in order to prevent the loosening of the bolts during long-term operation, anti-loose devices such as lock nuts or locking nuts are usually designed.

[0029] 5. Safety and maintenance

[0030] Periodic inspection: during the operation of the transformer, the fixing structure of the core pad needs to be checked regularly to ensure that the pad does not loosen or wear out. Thermal expansion consideration: during the operation of the transformer, the core and the pad will expand due to temperature changes. Therefore, the thermal expansion characteristics of the material should be considered during design to avoid stress concentration or damage caused by temperature difference.

[0031] Summary

[0032] The design of the fixing structure of the core pad of a large power transformer needs to consider stability, shock absorption effect, long-term durability and easy maintenance. A reasonable fixing structure not only improves the operation efficiency of the transformer, but also prolongs its service life and reduces the failure and adverse effects caused by vibration and noise.

[0033] The utility model will be further described in combination with the drawings and examples.

[0034] Please refer to Figs. 1-3 The utility model provides an embodiment: a kind of large power transformer core pad fixing structure, including bracing pad 1, adjusting paperboard 2, core support plate 3, bracing pad 1 and adjusting paperboard 2 are tied together by shrink band 6 and form pad assembly, and pad assembly is arranged between core support plate 3 and core lamination 5, bracing pad 1 is opened positioning hole in the corresponding position of bracing pad 1 in bracing pad 4 fastening bolt 4, and bracing pad 4 fastening bolt 4 can be screwed into bracing pad 1 after lengthening.

[0035] By bracing pad 1 in bracing pad 4 fastening bolt 4 corresponding position opening positioning hole, bracing pad 4 fastening bolt 4 is lengthened and screwed into bracing pad 1, that is, bidirectional constraint is simultaneously applied to the longitudinal and transverse directions of bracing pad 1, to ensure that bracing pad 1 does not loosen and fall off.

[0036] Please refer to Fig. 2 In the embodiment, core support plate 3 is divided into two groups distributed above and below, the inner wall of core support plate 3 is provided with pad assembly formed by bracing pad 1 and adjusting paperboard 2 being tied together by shrink band 6, and in use, the upper and lower ends of core lamination 5 can be carried and protected by the two groups of core support plates 3 distributed above and below.

[0037] Bracing pad 4 fastening bolt 4 is divided into several groups symmetrically distributed in front and back, bracing pad 4 fastening bolt 4 passes through core support plate 3, adjusting paperboard 2 and shrink band 6 and is installed in bracing pad 1, and in use, core support plate 3, adjusting paperboard 2 and shrink band 6 can be fixed by bracing pad 4 fastening bolt 4.

[0038] The adjusting paperboard 2 is arranged at the end away from each other of the supporting cushion block 1, the supporting cushion block 1 and the adjusting paperboard 2 are bound together by the shrinkable belt 6 to form a cushion block assembly, and the cushion block assembly is divided into several groups, and in use, the supporting cushion block 1 can improve the cushioning effect on the core laminations 5 by cooperating with the adjusting paperboard 2.

[0039] Please refer to Fig. 3 In the embodiment, one group of the supporting cushion block 1 and the adjusting paperboard 2 bound together by the shrinkable belt 6 to form a cushion block assembly corresponds to one group of the supporting plate fastening bolt 4, and in use, the core laminations 5 at the upper and lower ends can be cushioned by multiple points by cooperating with the supporting plate fastening bolt 4 through multiple groups of the cushion block assembly.

[0040] The end of the supporting cushion block 1 close to each other is attached to the upper and lower ends of the core laminations 5, the outer wall of the cushion block assembly formed by the supporting cushion block 1 and the adjusting paperboard 2 bound together by the shrinkable belt 6 is attached to the inner wall of the core supporting plate 3, and in use, the supporting cushion block 1 and the adjusting paperboard 2 can be quickly assembled by the shrinkable belt 6, so as to facilitate the use of the supporting cushion block 1 and the adjusting paperboard 2.

[0041] The upper and lower ends of the core laminations 5 are respectively arranged in the two groups of the core supporting plate 3, and the outer wall of the core laminations 5 is attached to the inner wall of the core supporting plate 3, and in use, the core laminations 5 can be positioned and carried by the core supporting plate 3.

[0042] In use, the supporting plate fastening bolt 4 is lengthened, and the supporting plate fastening bolt 4 is screwed to pass through the supporting cushion block 1 and the adjusting paperboard 2 and enter the supporting cushion block 1, and the supporting plate fastening bolt 4 simultaneously fixes the core supporting plate 3 and the supporting cushion block 1, that is, simultaneously applies bidirectional constraint to the longitudinal direction and the transverse direction of the supporting cushion block 1, so as to ensure that the supporting cushion block 1 does not appear loose and fall off.

[0043] Through the above steps, the supporting plate fastening bolt 4 is lengthened and screwed into the supporting cushion block 1 by positioning holes of the supporting cushion block 1 at the corresponding positions of the supporting plate fastening bolt 4, that is, simultaneously applies bidirectional constraint to the longitudinal direction and the transverse direction of the supporting cushion block 1, so as to ensure that the supporting cushion block 1 does not appear loose and fall off, and solves the problem that the supporting cushion block 1 in the fixing structure of the traditional transformer core cushion block is easy to loosen and fall off.

[0044] The embodiments of the utility model are described in detail in combination with the drawings above, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the person skilled in the art without departing from the purpose of the utility model.

Claims

1. A large power transformer core block fixing structure, characterized by: The supporting pad (1), the adjusting paperboard (2), the iron core supporting plate (3), the supporting plate fastening bolt (4), the iron core lamination (5) and the shrinkable band (6) are included, the supporting pad (1) and the adjusting paperboard (2) are bound together by the shrinkable band (6) to form a pad assembly, and the pad assembly is arranged between the iron core supporting plate (3) and the iron core lamination (5), the supporting pad (1) is provided with a positioning hole at the corresponding position of the supporting plate fastening bolt (4), and the supporting plate fastening bolt (4) can be screwed into the supporting pad (1) after being lengthened.

2. A large power transformer core block fixing structure according to claim 1, characterized in that: The iron core supporting plate (3) is divided into two groups distributed on the upper and lower sides, and the inner wall of the iron core supporting plate (3) is provided with a pad assembly formed by the supporting pad (1) and the adjusting paperboard (2) bound together by the shrinkable band (6).

3. A large power transformer core block fixing structure according to claim 2, characterized in that: The supporting plate fastening bolt (4) is divided into several groups symmetrically distributed in front and back, and the supporting plate fastening bolt (4) passes through the iron core supporting plate (3), the adjusting paperboard (2) and the shrinkable band (6) and is installed in the supporting pad (1).

4. The fixing structure of the core block of a large power transformer according to claim 3, characterized in that: The adjusting paperboard (2) is arranged at the end of the supporting pad (1) away from each other, and the pad assembly formed by the supporting pad (1) and the adjusting paperboard (2) bound together by the shrinkable band (6) is divided into several groups.

5. A large power transformer core block fixing structure according to claim 4, characterized in that: A group of pad assemblies formed by the supporting pad (1) and the adjusting paperboard (2) bound together by the shrinkable band (6) correspond to a group of supporting plate fastening bolts (4).

6. A large power transformer core block fixing structure according to claim 5, characterized in that: The end of the supporting pad (1) close to each other is attached to the upper and lower ends of the iron core lamination (5), and the outer wall of the pad assembly formed by the supporting pad (1) and the adjusting paperboard (2) bound together by the shrinkable band (6) is attached to the inner wall of the iron core supporting plate (3).

7. A large power transformer core block fixing structure according to claim 6, characterized in that: The upper and lower ends of the iron core lamination (5) are arranged in the two groups of iron core supporting plates (3) respectively, and the outer wall of the iron core lamination (5) is attached to the inner wall of the iron core supporting plate (3).

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