Iron core clamping structure and transformer

Abstract

The utility model relates to the field of transformers, in particular to an iron core clamping structure and a transformer. The iron core clamping structure comprises iron core clamping pieces arranged at the two ends of an iron core in the thickness direction respectively and a top beam arranged between the iron core clamping pieces, a containing space is formed in the side, facing the iron core, of the top beam, and the iron core clamping structure further comprises a cushion block arranged in the containing space and clamped between the iron core and the top beam. The top beam is fixedly connected with the iron core clamping pieces on the two sides, and a limiting structure for limiting the cushion block in the thickness direction of the iron core is further arranged on the top beam. The iron core clamping piece, the top beam and the cushion block are indirectly connected into a whole, vibration is not prone to occurring in the operation process of the transformer, and then the problems that in the prior art, the cushion block is limited and fixed through a bolt assembled on the iron core clamping piece, and vibration and noise are large in the working process of the transformer due to the fact that the top beam is not effectively limited are solved.

Description

Technical Field

[0001] The utility model relates to the field of transformers, in particular to an iron core clamping structure and a transformer. Background Art

[0002] In transformer equipment, the core components are two sets of coils arranged at intervals and the iron core covered by the coils. In order to improve the conversion efficiency and avoid losses caused by excessive eddy currents, the iron core is often composed of multiple silicon steel sheets stacked together. During the use of the transformer, the iron core needs to be compressed to prevent the silicon steel sheets from loosening and falling apart.

[0003] For example, a Chinese utility model patent with an authorization announcement date of January 4, 2006 and an authorization announcement number of CN2750431Y discloses a transformer core clamping structure, which includes an upper clamp (i.e., a core clamp), a top beam located between two adjacent upper clamps, and a wooden pad (i.e., a pad) disposed between the top beam and the core to limit the core with a stepped outer edge. The top beam includes a vertical plate arranged in parallel with the upper clamp and a horizontal plate disposed between the two vertical plates, a threaded hole is disposed on the upper clamp, a through hole corresponding to the threaded hole is disposed on the vertical plate of the top beam, and a bolt threadedly assembled in the threaded hole is disposed on the upper clamp, the bolt head of the bolt is exposed outside the upper clamp, and the end of the screw rod away from the bolt head abuts against the pad. During installation, the bolt is twisted by screwing the bolt head located outside, and the distance between the bolt and the pad can be adjusted to adjust the tightening torque.

[0004] However, in the above technical solution, during the clamping process, there may be errors in the position accuracy of the two core clamps. In order to facilitate installation, the distance between the two core clamps will be greater than the length of the top beam, so that the top beam has a movable margin in the thickness direction of the core. Part of the bolt is fixed on the core clamp, and part of it is directly against the pad, resulting in no effective limit on the top beam. During the operation of the transformer, the core will vibrate, and the vibration will be transmitted to the top beam. Since the top beam has no effective limit in the thickness direction of the core, the top beam will aggravate the vibration of the transformer during operation, causing huge working noise. Utility Model Content

[0005] The purpose of the utility model is to provide a core clamping structure for solving the problem in the prior art that the pad is limited and fixed by bolts assembled on the core clamp, but the top beam has no effective limit, which leads to large vibration and noise during the operation of the transformer; the purpose of the utility model is also to provide a transformer for solving the above technical problems.

[0006] In order to achieve the above purpose, the core clamping structure in the utility model adopts the following technical solutions:

[0007] A core clamping structure includes core clamps respectively arranged at both ends of the core in the thickness direction and a top beam arranged between the core clamps. A receiving space is arranged on the side of the top beam facing the core. The core clamping structure also includes a pad block arranged in the receiving space and clamped between the core and the top beam. The top beam is fixedly connected to the core clamps on both sides. A limiting structure is also arranged on the top beam to limit the pad block in the thickness direction of the core.

[0008] Furthermore, the top beam includes mounting plates arranged at intervals and used to be fixedly connected to the core clamps and connecting plates fixedly connected to the ends of the two mounting plates. The connecting plates and the mounting plates at both ends enclose the accommodating space, and the limiting structure is arranged on the connecting plates.

[0009] Furthermore, one of the connecting plate and the cushion block is provided with a positioning column, and the other is provided with a positioning hole adapted to the positioning column, and the positioning column or the positioning hole on the connecting plate constitutes the limiting structure.

[0010] Furthermore, an insulating paperboard is arranged between the connecting plate and the cushion block, and an avoidance hole for avoiding the positioning column is arranged on the insulating paperboard.

[0011] Furthermore, a mounting stud is fixedly provided on the mounting plate, and the mounting stud is used to pass through the corresponding core clamp and then assemble a nut to achieve a fixed connection between the core clamp and the mounting plate.

[0012] Furthermore, a bolt mounting hole is provided on the mounting plate, a fastening bolt is fixedly provided in the bolt mounting hole, a bolt head of the fastening bolt is located in the accommodating space of the top beam, and a screw rod of the fastening bolt located outside the top beam constitutes the mounting stud.

[0013] Furthermore, each mounting plate is provided with at least two mounting studs.

[0014] Furthermore, the core clamp includes a channel steel and a bracket arranged on a side of the channel steel, and the bracket is provided with a mounting hole corresponding to the mounting stud.

[0015] Furthermore, a reinforcement plate is fixedly connected between the mounting plate and the connecting plate.

[0016] The beneficial effects of the core clamping structure in the utility model are as follows: the utility model improves the existing core clamping structure, and facilitates the clamping of the core by arranging the top beam and the core clamp, and facilitates the adaptation to the core by arranging the pad, so as to better clamp the core; the top beam and the core clamps on both sides are fixedly connected by fasteners, so that the top beam and the core clamp are relatively fixed; the limiting structure arranged on the top beam facilitates the limiting of the pad, that is, the core clamp and the top beam are relatively fixed by the fasteners, and the top beam and the pad are relatively fixed by the limiting structure, so that the core clamp, the top beam and the pad are indirectly connected into a whole, which is not easy to vibrate during the operation of the transformer, thereby solving the problem that in the prior art, the pad is limited and fixed by bolts assembled on the core clamp, and the top beam has no effective limit, resulting in large vibration and noise during the operation of the transformer.

[0017] In order to achieve the above purpose, the transformer in the utility model adopts the following technical solutions:

[0018] A transformer comprises an iron core and an iron core clamping structure for clamping the iron core, wherein the iron core clamping structure comprises iron core clamps respectively arranged at both ends of the iron core in the thickness direction and a top beam arranged between the iron core clamps, a receiving space is arranged on the side of the top beam facing the iron core, the iron core clamping structure also comprises a pad block arranged in the receiving space and clamped between the iron core and the top beam, the top beam is fixedly connected to the iron core clamps on both sides, and a limiting structure is also arranged on the top beam for limiting the pad block in the thickness direction of the iron core.

[0019] Furthermore, the top beam includes mounting plates arranged at intervals and used to be fixedly connected to the core clamps and connecting plates fixedly connected to the ends of the two mounting plates. The connecting plates and the mounting plates at both ends enclose the accommodating space, and the limiting structure is arranged on the connecting plates.

[0020] Furthermore, one of the connecting plate and the cushion block is provided with a positioning column, and the other is provided with a positioning hole adapted to the positioning column, and the positioning column or the positioning hole on the connecting plate constitutes the limiting structure.

[0021] Furthermore, an insulating paperboard is arranged between the connecting plate and the cushion block, and an avoidance hole for avoiding the positioning column is arranged on the insulating paperboard.

[0022] Furthermore, a mounting stud is fixedly provided on the mounting plate, and the mounting stud is used to pass through the corresponding core clamp and then assemble a nut to achieve a fixed connection between the core clamp and the mounting plate.

[0023] Furthermore, a bolt mounting hole is provided on the mounting plate, a fastening bolt is fixedly provided in the bolt mounting hole, a bolt head of the fastening bolt is located in the accommodating space of the top beam, and a screw rod of the fastening bolt located outside the top beam constitutes the mounting stud.

[0024] Furthermore, each mounting plate is provided with at least two mounting studs.

[0025] Furthermore, the core clamp includes a channel steel and a bracket arranged on a side of the channel steel, and the bracket is provided with a mounting hole corresponding to the mounting stud.

[0026] Furthermore, a reinforcement plate is fixedly connected between the mounting plate and the connecting plate.

[0027] The beneficial effects of the transformer in the utility model are as follows: the utility model improves the existing transformer, and facilitates clamping of the core by arranging the top beam and the core clamp, and facilitates adaptation to the core by arranging the pad, so as to better clamp the core; the top beam and the core clamps on both sides are fixedly connected by fasteners, so that the top beam and the core clamp are relatively fixed; the limiting structure arranged on the top beam facilitates limiting the pad, that is, the core clamp and the top beam are relatively fixed by the fasteners, and the top beam and the pad are relatively fixed by the limiting structure, so that the core clamp, the top beam and the pad are indirectly connected into a whole, and it is not easy to vibrate during the operation of the transformer, thereby solving the problem that in the prior art, the pad is limited and fixed by bolts assembled on the core clamp, and the top beam has no effective limit, resulting in large vibration and noise during the operation of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a partial structural schematic diagram of an embodiment of a transformer in the utility model;

[0029] Figure 2 This is a front view of the top beam in the embodiment of the transformer in the utility model;

[0030] Figure 3 A bottom view of a top beam in an embodiment of a transformer in the utility model;

[0031] Figure 4 It is a side view of the top beam in the embodiment of the transformer in the utility model.

[0032] In the figure: 1. iron core; 2. top beam; 21. mounting plate; 22. connecting plate; 23. positioning column; 24. fastening bolt; 25. reinforcing plate; 3. spacer; 41. channel steel; 42. bracket. DETAILED DESCRIPTION

[0033] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0034] In the utility model, fastening studs are fixedly arranged on the top beam so that the fastening bolts are fixed on the core clamps on both sides, thereby enhancing the limitation of the top beam. At the same time, a limiting structure is arranged on the top beam with limitation to limit the position of the cushion block, thereby avoiding vibration and noise during the operation of the transformer.

[0035] In the embodiment of the transformer of the utility model:

[0036] like Figure 1 As shown, in this embodiment, the transformer includes an iron core 1 and an iron core clamping structure for clamping the iron core 1, wherein the iron core clamping structure includes iron core clamps for being arranged at both ends of the iron core 1 in the thickness direction and a top beam 2 arranged between the iron core clamps, and a receiving space is arranged on the side of the top beam 2 facing the iron core 1, and a cushion block 3 is arranged in the receiving space. The cushion block 3 is a wooden cushion block, and the edge portion of the iron core is stepped, and a step structure adapted to the stepped edge of the iron core 1 is arranged on the outer periphery of the cushion block 3.

[0037] like Figure 1 As shown, the top beam 2 includes mounting plates 21 arranged in parallel and spaced apart and used to be arranged adjacent to the core clamps, and connecting plates 22 fixing the ends of the two mounting plates 21. The cross-section of the top beam 2 is "U"-shaped, and the connecting plates 22 and the mounting plates 21 at both ends enclose the accommodating space. The cushion block 3 needs to press the core 1, so it is also necessary to set a limiting structure to limit the position of the cushion block 3 to facilitate the cushion block 3 to press the core 1. Specifically, the limiting structure is a positioning column 23 fixedly set on the inner side of the connecting plate 22, and a positioning hole adapted to the positioning column 23 is set on the cushion block 3. The positioning column 23 is a pin welded on the inner side of the connecting plate 22. In order to improve the strength, a reinforcing plate 25 fixedly connected to the mounting plate 21 and the connecting plate 22 is also provided between the mounting plate 21 and the connecting plate 22.

[0038] Of course, in other embodiments, the positioning column can also be a convex column integrally formed on the connecting plate. Alternatively, in other embodiments, the limiting structure can also be provided on the mounting plate, and the cushion block is pressed by the limiting structure. Alternatively, in other embodiments, in order to increase the contact area between the limiting structure and the cushion block, the limiting structure can also be provided as a limiting strip. Alternatively, in other embodiments, the top beam can also be an integrally formed channel steel, and the two opposite sides of the channel steel are used to fix the mounting bolts. Alternatively, in other embodiments, the top beam can no longer be provided with a mounting plate, but two connecting rods can be provided at the end of the connecting plate, and the connecting rod and the connecting plate form a triangle in projection, and the connecting rod is fixedly connected to the core clamp. Alternatively, in other embodiments, if the connection strength between the mounting plate and the connecting plate is sufficient, the reinforcing plate can no longer be provided. Alternatively, in other embodiments, the positioning column can also be provided on the cushion block, and the positioning hole can be provided on the connecting plate.

[0039] like Figure 2 , Figure 3 and Figure 4 As shown, in order to achieve the fixed connection between the top beam 2 and the core clamp, a mounting stud is also provided on the mounting plate 21 of the top beam 2. Specifically, a bolt mounting hole is provided on the mounting plate 21, and a fastening bolt 24 is welded and fixed in the bolt mounting hole. The bolt head of the fastening bolt 24 is located in the accommodating space of the top beam 2, and the screw of the fastening bolt 24 located outside the top beam 2 constitutes the mounting stud. Since the bolt head is also located in the accommodating space of the top beam 2 and abuts against the inner side surface of the mounting plate 21, when the bolt is subjected to force, in addition to being able to withstand a certain torque at the welding point, the bolt head can also withstand a certain torque, which is convenient for improving the connection strength. In addition, two mounting studs are provided on each mounting plate 21, so that the force is more uniform, and the cooperation between the two mounting studs and the mounting plate 21 also facilitates the anti-rotation of the top beam 2. Of course, in other embodiments, the mounting plate may no longer be provided with a bolt mounting hole, but a screw is directly welded on the plate surface of the mounting plate arranged outward, and the screw on the mounting plate constitutes the mounting stud. Alternatively, in other embodiments, bolt holes may be provided on the mounting plate and the core clamp respectively, and bolts may be passed through the two components in sequence and then fixedly connected using nuts. Alternatively, in other embodiments, the top beam and the core clamp may be welded or bonded. Alternatively, in other embodiments, three or four or other numbers greater than two may be provided. Alternatively, in other embodiments, the mounting stud may be provided as one.

[0040] like Figure 1 As shown, the core clamp includes a channel steel 41, the channel steel 41 has two oppositely arranged side edges and a main edge connecting the two side edges, and brackets 42 are arranged on the outside of the two side edges, and mounting holes corresponding to the mounting studs are arranged on the brackets 42. By arranging the brackets 42 on both sides of the channel steel 41, it is convenient to install. During the installation process, it is not necessary to distinguish the front and back of the channel steel 41, which is convenient to improve the installation efficiency. Of course, in other embodiments, the bracket can also be arranged on only one side of the opposite side edges of the channel steel.

[0041] like Figure 1As shown, after the installation is completed, the middle of the connecting plate 22 of the core 1 and the top beam 2 is close, and the core 1 and the top beam 2 need to be insulated from each other. Specifically, an insulating cardboard is also provided between the core 1 and the top beam 2, and the insulating cardboard is limited between the cushion block 3 and the connecting plate 22. A avoidance hole for avoiding the positioning column 23 is also provided on the insulating cardboard. The avoidance hole is provided to facilitate installation in place, and the positioning column 23 can also be used to achieve the installation of the insulating cardboard. In the process of use, the positioning column 23 is provided to prevent the cushion block 3 from moving in the thickness direction of the core 1, and a longitudinal force is required for the limitation of the core 1, so the connecting plate 22 of the top beam 2 also needs to squeeze the cushion block 3 to provide a longitudinal force. That is to say, the insulating cardboard is in the squeezing of the connecting plate 22 and the cushion block 3. The insulating cardboard itself is compressible, so the setting of the insulating cardboard can not only play an insulating role, but also provide deformation space for the cushion block 3. Of course, in other embodiments, if a larger insulating gap can be maintained between the top beam and the core, the insulating cardboard may no longer be provided. It is worth noting that the present embodiment is described by taking the upper clamp in the transformer as an example, so the spacer is located above the core. When the core clamping structure is used below the transformer, the spacer is naturally located below the core.

[0042] In the embodiment of the core clamping structure of the utility model:

[0043] The core clamping structure in this embodiment is the same as that in the above transformer embodiment, and will not be repeated here.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A core clamping structure, comprising core clamps respectively arranged at both ends of the core in the thickness direction and a top beam arranged between the core clamps, a receiving space being arranged on a side of the top beam facing the core, and a spacer being arranged in the receiving space and clamped between the core and the top beam, characterized in that: The top beam is fixedly connected to the core clamps on both sides, and a limiting structure for limiting the pad in the core thickness direction is also provided on the top beam.

2. The core clamping structure according to claim 1, characterized in that: The top beam includes mounting plates arranged at intervals and fixedly connected to the core clamps and connecting plates fixedly connected to the ends of the two mounting plates. The connecting plates and the mounting plates at both ends enclose the accommodating space, and the limiting structure is arranged on the connecting plates.

3. The core clamping structure according to claim 2, characterized in that: One of the connecting plate and the cushion block is provided with a positioning column, and the other is provided with a positioning hole adapted to the positioning column. The positioning column or the positioning hole on the connecting plate constitutes the limiting structure.

4. The core clamping structure according to claim 3, characterized in that: An insulating paperboard is arranged between the connecting plate and the cushion block, and an avoidance hole for avoiding the positioning column is arranged on the insulating paperboard.

5. The core clamping structure according to any one of claims 2 to 4, characterized in that: The mounting plate is fixedly provided with mounting studs, which are used to pass through corresponding core clamps and then be assembled with nuts to achieve a fixed connection between the core clamps and the mounting plate.

6. The core clamping structure according to claim 5, characterized in that: The mounting plate is provided with a bolt mounting hole, in which a fastening bolt is fixedly arranged, the bolt head of the fastening bolt is located in the accommodating space of the top beam, and the screw rod of the fastening bolt located outside the top beam constitutes the mounting stud.

7. The core clamping structure according to claim 5, characterized in that: At least two mounting studs are provided on each mounting plate.

8. The core clamping structure according to claim 5, characterized in that: The core clamp comprises a channel steel and a bracket arranged on a side of the channel steel, and the bracket is provided with a mounting hole corresponding to the mounting stud.

9. The core clamping structure according to any one of claims 2 to 4, characterized in that: A reinforcing plate is fixedly connected between the mounting plate and the connecting plate.

10. A transformer, comprising an iron core and an iron core clamping structure for clamping the iron core, characterized in that: The core clamping structure is the same as the core clamping structure described in any one of claims 1-9.

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