Transformer iron core

Abstract

The utility model provides a transformer iron core, which belongs to the technical field of transformers and comprises a silicon steel sheet lamination body, clamping pieces clamped on two sides of the silicon steel sheet lamination body and insulating sheets arranged between the silicon steel sheet lamination body and the clamping pieces. The transformer iron core further comprises a positioning piece and a locking piece. Wherein the positioning piece is fixedly arranged on the clamping piece and is provided with an insertion opening suitable for vertical insertion of the insulating strip. The locking piece is hinged to the positioning piece and has the elastic freedom degree of rotating towards the interior of the insertion opening. A clamping groove suitable for clamping connection of the locking piece is formed in the insulating strip in the horizontal direction, and when the insulating strip is inserted into the inserting opening, the locking piece is clamped with the clamping groove so as to limit the insulating strip from being pulled out of the inserting opening. According to the transformer iron core provided by the utility model, complex multi-direction alignment is simplified into single-direction insertion, so that the complexity of operation is obviously reduced, and the installation efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of transformer technology, and more specifically, it relates to a transformer core. Background Technology

[0002] The transformer core is the main magnetic circuit component of a transformer, primarily composed of a laminated silicon steel sheet and clamps. The clamps are located on both sides of the laminated silicon steel sheet, holding it in place. The clamps on both sides are connected by through-bolts to achieve a tight fit. Insulating sheets are used between the clamps and the laminated silicon steel sheet to prevent short circuits, which could increase additional iron losses and cause localized overheating.

[0003] The existing insulating sheet is directly clamped between the clamp and the silicon steel sheet stack. During installation, workers need to accurately locate the position between the clamp and the insulating sheet to ensure that the clamp and the insulating sheet, as well as the two clamps themselves, are in a correctly aligned state. Otherwise, subsequent installation and fixation cannot be carried out. Therefore, during assembly, workers need to constantly observe the position of the clamp and the insulating sheet and make continuous adjustments, resulting in low installation efficiency and slow installation speed. Utility Model Content

[0004] The purpose of this utility model is to provide a transformer core that enables rapid installation between the clamps and the insulating sheets.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A transformer core is provided, comprising: a silicon steel sheet stack, clamps holding both sides of the silicon steel sheet stack, and an insulating sheet disposed between the silicon steel sheet stack and the clamps, and further comprising:

[0006] A positioning element, fixedly mounted on the clamp, and having a socket suitable for vertical insertion of the insulating sheet; and

[0007] The locking element is hinged to the positioning element and has an elastic degree of freedom to rotate toward the socket.

[0008] The insulating sheet has a slot along the horizontal direction suitable for engaging with the locking member. When the insulating sheet is inserted into the socket, the locking member engages with the slot to prevent the insulating sheet from being pulled out of the socket.

[0009] In one possible implementation, the positioning element includes:

[0010] Both side plates are fixedly mounted on the clamp and extend away from the clamp; the distance between the two side plates is adapted to the width of the insulating sheet;

[0011] Two folded edges are fixedly mounted on the two side plates respectively, and extend towards each other; the distance between each folded edge and the clamp is adapted to the thickness of the insulating sheet;

[0012] The base plate is fixedly mounted on the clamp and located between the two side plates, and is used to limit the depth of the insulating sheet inserted between the two side plates;

[0013] The two side plates, the two folded edges, the bottom plate, and the clamp form the insertion port.

[0014] In one possible implementation, the transformer core further includes:

[0015] A limiting member is inserted through the insulating sheet and the clamp, and its two ends are respectively connected to the insulating sheet and the clamp.

[0016] In one possible implementation, both the insulating sheet and the clamp are provided with connecting holes. When the insulating sheet is inserted into the socket, the two connecting holes are aligned with each other so that the limiting member passes through the two connecting holes simultaneously.

[0017] In one possible implementation, the limiting member includes:

[0018] The connecting rod passes through the insulating sheet and the clamp.

[0019] Two limiting parts are respectively provided at both ends of the connecting rod, and have elastic degrees of freedom extending radially from inside the connecting rod;

[0020] One of the limiting portions abuts against one of the insulating sheet and the clamp, and the other limiting portion abuts against the other of the insulating sheet and the clamp, so that the two limiting portions clamp the insulating sheet and the clamp.

[0021] In one possible implementation, the limiting part includes:

[0022] A limiting block is slidably disposed on the connecting rod along the radial direction of the connecting rod;

[0023] The spring, with its two ends fixed to the limiting block and the connecting rod respectively, is used to push the limiting block out from the connecting rod.

[0024] In one possible implementation, the limiting block is a wedge-shaped block;

[0025] When the connecting rod passes through the insulating sheet or the clamp, the limiting block can be pressed and retracted into the connecting rod.

[0026] In one possible implementation, a spring is fixedly provided on the positioning member, and the spring abuts against the locking member to push the locking member to rotate into the socket.

[0027] In one possible implementation, the hinged end of the locking member is located at the insertion end of the positioning member.

[0028] In one possible implementation, the insulating sheet has chamfers at both ends suitable for insertion into the socket.

[0029] This utility model provides a transformer core, which, compared with existing technologies, offers the following advantages: By using the insertion of a positioning component with the vertical insertion of an insulating sheet, the pre-positioning function of the insulating sheet is achieved. During installation, the operator only needs to insert the insulating sheet vertically into the insertion port to automatically calibrate the horizontal position of the insulating sheet and the clamp, eliminating the need for repeated adjustments. When the insulating sheet is inserted into the insertion port, it pushes the locking component to rotate and avoid it. After the insulating sheet reaches the predetermined position, the locking component automatically springs back and locks into the slot under gravity, thus completing both the positioning and locking of the insulating sheet. This facilitates subsequent fixing of the insulating sheet and the clamp, ensuring that the insulating sheet is not easily displaced during the fixing process. Compared to the traditional operation process that requires simultaneous alignment of the clamp and the insulating sheet, this utility model simplifies the complex multi-directional alignment to a single-directional insertion, significantly reducing operational complexity and improving installation efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the transformer core provided in an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram showing the installation state of the insulating sheet and clamp provided in an embodiment of the present utility model;

[0033] Figure 3 This is a schematic diagram showing the completed installation of the insulating sheet and clamp provided in this embodiment of the utility model;

[0034] Figure 4 A cross-sectional view of the insulating sheet and clamp in the installation state provided in an embodiment of this utility model;

[0035] Figure 5 for Figure 4 A magnified structural diagram of part A in the middle;

[0036] Figure 6 This is a schematic diagram of the structure of the limiting member provided in an embodiment of the present utility model.

[0037] In the figure: 1. Silicon steel sheet stack; 2. Clamping piece; 3. Insulating sheet; 31. Slot; 4. Positioning piece; 41. Insert; 42. Side plate; 43. Folded edge; 44. Base plate; 5. Locking piece; 6. Limiting piece; 61. Connecting rod; 62. Limiting part; 621. Limiting block; 622. Spring; 7. Spring sheet. Detailed Implementation

[0038] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0039] Please see Figure 1 The present invention provides a transformer core. A transformer core includes a silicon steel sheet stack 1, clamps 2 clamping both sides of the silicon steel sheet stack 1, and insulating sheets 3 disposed between the silicon steel sheet stack 1 and the clamps 2.

[0040] Please see Figure 2 , Figure 3 and Figure 4 The transformer core also includes a positioning element 4 and a locking element 5. The positioning element 4 is fixedly mounted on the clamping element 2 and has a socket 41 suitable for vertical insertion of the insulating sheet 3. The locking element 5 is hinged to the positioning element 4 and has an elastic degree of freedom to rotate into the socket 41. A slot 31 is formed on the insulating sheet 3 along the horizontal direction, suitable for engaging with the locking element 5. When the insulating sheet 3 is inserted into the socket 41, the locking element 5 engages with the slot 31 to prevent the insulating sheet 3 from being pulled out of the socket 41.

[0041] By fixing a positioning element 4 to the clamp 2, the positioning element 4 has a vertical insertion port 41 that is adapted to the insulating sheet 3. The shape and size of the insertion port 41 precisely match the insulating sheet 3, so that during installation, the operator only needs to align the insulating sheet 3 with the insertion port 41 and insert it vertically to quickly complete the initial horizontal positioning of the insulating sheet 3 and the clamp 2. Compared with the traditional method, this greatly reduces the time required for positioning and significantly improves the installation speed.

[0042] The locking element 5 is hinged to the positioning element 4 and has an elastic degree of freedom to rotate inward into the socket 41. The insulating sheet 3 has a corresponding slot 31. When the insulating sheet 3 is inserted into the socket 41, the side of the insulating sheet 3 pushes the locking element 5 to rotate around the hinge point, temporarily removing it from the socket 41 area. When the insulating sheet 3 is fully inserted, the slot 31 aligns with the locking element 5, and the locking element 5 springs back under its own elastic force, tightly engaging with the slot 31. This locking method requires no additional tools, is simple and convenient to operate, and can quickly fix the insulating sheet 3 to the positioning element 4, preventing it from being pulled out of the socket 41, further saving installation time and improving overall installation efficiency.

[0043] The insulating sheet 3 is positioned by the insertion port 41 of the positioning component 4, and the locking component 5 cooperates with the slot 31, ensuring precise and controllable positioning of the insulating sheet 3 during installation. After the insulating sheet 3 is inserted into the insertion port 41 and fixed by the locking component 5, its positional accuracy is greatly guaranteed, ensuring the accurate positioning between the clamp 2 and the insulating sheet 3, and the accurate positioning between the two clamps 2. This facilitates the subsequent operation of connecting the clamps 2 on both sides with the through-bolt, improves the overall accuracy and reliability of the installation, reduces rework caused by installation errors, and helps improve the assembly quality of the transformer core.

[0044] Please see Figure 2 , Figure 3 and Figure 4 In some embodiments, the positioning member 4 includes two side plates 42, two flanges 43, and a bottom plate 44. The two side plates 42 are fixedly mounted on the clamp 2 and extend away from the clamp 2. The two side plates 42 are parallel to each other, and the distance between them matches the width of the insulating sheet 3. The two flanges 43 are respectively fixedly mounted on the two side plates 42 and extend towards each other, with the two flanges 43 on the same plane. The distance between each flange 43 and the clamp 2 matches the thickness of the insulating sheet 3. The bottom plate 44 is fixedly mounted on the clamp 2 and located between the two side plates 42, used to limit the depth of insertion of the insulating sheet 3 between the two side plates 42. The bottom plate 44 is perpendicular to the side plates 42. The two side plates 42, the two flanges 43, the bottom plate 44, and the clamp 2 form an insertion port 41.

[0045] The positioning element 4, consisting of two side plates 42, two folded edges 43, a base plate 44, and a clamp 2, forms the insertion port 41. The two side plates 42 are fixed to the clamp 2 and extend away from it. The distance between them matches the width of the insulating sheet 3, limiting the insulating sheet 3 from both sides to ensure it does not shift laterally during insertion. The two folded edges 43 are fixed to the side plates 42 and extend towards each other. The distance between each folded edge 43 and the clamp 2 matches the thickness of the insulating sheet 3, limiting the insulating sheet 3 from above and below to prevent it from wobbling during insertion. The base plate 44 is fixed to the clamp 2 and located between the two side plates 42, limiting the insertion depth of the insulating sheet 3 to ensure consistent insertion depth each time. This precisely fitted positioning space design further improves the accuracy and stability of the insulating sheet 3's positioning, providing a reliable guarantee for subsequent installation.

[0046] Please see Figure 3 In some embodiments, the transformer core further includes a limiting member 6 that passes through the insulating sheet 3 and the clamp 2. The two ends of the limiting member 6 are connected to the insulating sheet 3 and the clamp 2, respectively.

[0047] The limiting member 6 passes through the insulating sheet 3 and the clamp 2, with both ends connected to the insulating sheet 3 and the clamp 2 respectively. Based on the initial fixing of the insulating sheet 3 to the positioning member 4 by the locking member 5, the limiting member 6 further enhances the connection stability between the insulating sheet 3 and the clamp 2. During the operation of the transformer core, it may be subjected to external forces such as vibration. The locking member 5 alone, with its connection to the slot 31, may not be sufficient to guarantee the stability of the insulating sheet 3. The limiting member 6 effectively prevents the insulating sheet 3 from shifting under these external forces, ensuring that the insulating sheet 3 is always in the correct position, maintaining good insulation performance between the clamp 2 and the silicon steel sheet stack 1, and ensuring the normal operation of the transformer core.

[0048] Please see Figure 3 In some embodiments, both the insulating sheet 3 and the clamp 2 are provided with connecting holes. When the insulating sheet 3 is inserted into the socket 41, the two connecting holes are aligned with each other so that the limiting member 6 passes through the two connecting holes at the same time.

[0049] Both the insulating sheet 3 and the clamp 2 have connecting holes. When the insulating sheet 3 is inserted into the socket 41, its position is determined by the two side plates 42, the two folded edges 43, the base plate 44, and the clamp 2, thus aligning the connecting holes on the insulating sheet 3 and the clamp 2. This allows the limiting member 6 to easily pass through both connecting holes simultaneously, greatly simplifying the installation process. When installing the limiting member 6, workers no longer need to spend time finding and adjusting the relative positions of the connecting holes on the insulating sheet 3 and the clamp 2. They only need to insert the insulating sheet 3 into the socket 41 as required, and the connecting holes will naturally align, allowing for quick insertion of the limiting member 6. This improves installation efficiency, ensures the accuracy of the limiting member 6's installation position, and further enhances the stability of the connection between the insulating sheet 3 and the clamp 2.

[0050] Please see Figure 5 and Figure 6 In some embodiments, the limiting member 6 includes a connecting rod 61 and two limiting portions 62. The connecting rod 61 passes through the insulating sheet 3 and the clamping member 2. The two limiting portions 62 are respectively disposed at both ends of the connecting rod 61 and have an elastic degree of freedom extending radially from within the connecting rod 61. One limiting portion 62 abuts against one of the insulating sheet 3 and the clamping member 2, and the other limiting portion 62 abuts against the other of the insulating sheet 3 and the clamping member 2, so that the two limiting portions 62 clamp the insulating sheet 3 and the clamping member 2.

[0051] The connecting rod 61 of the limiting member 6 passes through the insulating sheet 3 and the clamp 2, and the limiting portions 62 at both ends have elastic degrees of freedom extending radially from the inside of the connecting rod 61. After the connecting rod 61 passes through the insulating sheet 3 and the clamp 2, the limiting portions 62 extend from the inside of the connecting rod 61 under the action of elastic force. One limiting portion 62 abuts against the insulating sheet 3, and the other limiting portion 62 abuts against the clamp 2, thereby clamping the insulating sheet 3 and the clamp 2. During installation, the limiting portions 62 are pressed into the connecting rod 61, allowing the connecting rod 61 to pass smoothly through the connecting hole. Then, the limiting portions 62 pop out under the action of elastic force and fit tightly against the insulating sheet 3 and the clamp 2. This structure eliminates the need for additional nuts, bolts, or other connecting parts, making installation simple and convenient. It also provides reliable clamping force, effectively preventing relative displacement between the insulating sheet 3 and the clamp 2, and enhancing the stability of the connection.

[0052] Please see Figure 5 In some embodiments, the limiting part 62 includes a limiting block 621 and a spring 622. The limiting block 621 is slidably disposed on the connecting rod 61 along its radial direction. The spring 622 is fixed at both ends to the limiting block 621 and the connecting rod 61, respectively, and is used to push the limiting block 621 out of the connecting rod 61.

[0053] The limiting part 62 consists of a limiting block 621 and a spring 622. The two ends of the spring 622 are fixed to the limiting block 621 and the connecting rod 61 respectively, and are used to push the limiting block 621 out of the connecting rod 61. During installation, when the connecting rod 61 passes through the connecting hole of the insulating sheet 3 or the clamp 2, the limiting block 621 is compressed, compressing the spring 622 and retracting it into the connecting rod 61. After the connecting rod 61 passes through the connecting hole, the spring 622 returns to its original state, pushing the limiting block 621 out of the connecting rod 61 and tightly fitting it against the insulating sheet 3 or the clamp 2, thus clamping and fixing the insulating sheet 3 and the clamp 2.

[0054] It should be noted that the spring 622 can be a compression spring with a suitable elastic coefficient to ensure that the limiting block 621 can provide sufficient clamping force, while also being able to be compressed smoothly during installation. This makes the elastic performance of the limiting part 62 more stable and reliable, ensuring the effectiveness of the limiting part 6 in clamping the insulating sheet 3 and the clamp 2.

[0055] Please see Figure 5 In some embodiments, the limiting block 621 is a wedge-shaped block. When the connecting rod 61 passes through the insulating sheet 3 or the clamp 2, the limiting block 621 can be pressed and retracted into the connecting rod 61.

[0056] The limiting block 621 is a wedge-shaped block. When the connecting rod 61 passes through the insulating sheet 3 or the clamp 2, the inclined surface of the wedge-shaped block first contacts the edge of the connecting hole. As the connecting rod 61 is pushed forward, the wedge-shaped block is squeezed and can smoothly retract into the connecting rod 61. Compared with limiting blocks of other shapes, the wedge-shaped block is smoother during installation and reduces installation resistance. If a square limiting block is used, jamming may occur when passing through the connecting hole, but the inclined surface design of the wedge-shaped block can guide it smoothly into the connecting rod 61. After the connecting rod 61 passes through the connecting hole, the limiting block 621 pops out under the action of the spring 622, and its wedge-shaped surface fits tightly with the insulating sheet 3 or the clamp 2, increasing the contact area, improving the clamping stability, and further optimizing the installation and fixing effect of the limiting member 6.

[0057] Please see Figure 2 , Figure 3 and Figure 4 In some embodiments, a spring 7 is fixedly provided on the positioning member 4, and the spring 7 abuts against the locking member 5 to push the locking member 5 to rotate into the socket 41.

[0058] The spring piece 7 fixedly mounted on the positioning member 4 abuts against the locking member 5, pushing the locking member 5 to rotate into the socket 41. During the insertion of the insulating sheet 3 into the socket 41, the locking member 5 is pushed away by the insulating sheet 3, at which time the spring piece 7 undergoes elastic deformation to store energy. When the insulating sheet 3 is inserted into the correct position and the slot 31 is aligned with the locking member 5, the spring piece 7 releases its elastic potential energy, further pushing the locking member 5 to tightly engage with the slot 31.

[0059] It should be noted that the spring piece 7 can be made of high-strength spring steel sheet, with one end fixed to the positioning part 4 and the other end in contact with the locking part 5. The spring piece 7 enhances the locking force of the locking part 5, preventing the locking part 5 from disengaging from the slot 31 due to vibration or other factors during the operation of the transformer core. This improves the reliability of the insulation sheet 3 fixation, ensures that the insulation sheet 3 is always in the correct position, and protects the insulation performance of the transformer core.

[0060] Please see Figure 4 In some embodiments, the hinged end of the locking member 5 is located at the insertion end of the positioning member 4.

[0061] Specifically, the hinge end of the locking member 5 is located at the insertion end of the positioning member 4, allowing the insulating sheet 3 to rotate around the hinge point more smoothly when inserted into the socket 41. When the insulating sheet 3 is inserted from the insertion end of the positioning member 4, the front end of the insulating sheet 3 first contacts the locking member 5. Because the hinge end is located at the insertion end, the locking member 5 can rotate around the hinge point more smoothly, allowing the insulating sheet 3 to be inserted smoothly. At the same time, when the locking member 5 engages with the slot 31, this hinge position allows the locking member 5 to engage tightly with the slot 31 at a more reasonable angle under the action of the spring piece 7, enhancing the stability of the locking, improving the reliability of the insulating sheet 3's fixation, and ensuring the normal installation and operation of the transformer core.

[0062] Please see Figure 2 , Figure 3 and Figure 4 In some embodiments, the two ends of the insulating sheet 3 have chamfers suitable for insertion into the socket 41.

[0063] Specifically, the insulating sheet 3 has chamfers at both ends suitable for insertion into the socket 41. During installation, the chamfers act as a guide, making it easier to align and insert the insulating sheet 3 into the socket 41. For example, when a worker holds the insulating sheet 3 to insert it into the socket 41, the chamfers help them quickly find the insertion position, reducing adjustment time. Simultaneously, during insertion, the chamfers reduce friction between the insulating sheet 3 and the edge of the socket 41, making the insertion process smoother, improving installation efficiency, and further optimizing the installation process of the insulating sheet 3.

[0064] In summary, the transformer core provided by this utility model, compared with the prior art, achieves the pre-positioning function of the insulating sheet 3 through the vertical insertion and cooperation of the insertion port 41 of the positioning member 4 with the insulating sheet 3. During installation, the operator only needs to insert the insulating sheet 3 vertically into the insertion port 41 to automatically complete the horizontal position calibration of the insulating sheet 3 and the clamp 2, without the need for repeated adjustments. When the insulating sheet 3 is inserted into the insertion port 41, the insulating sheet 3 will push the locking member 5 to rotate and avoid it. After the insulating sheet 3 reaches the predetermined position, the locking member 5 will automatically spring back and lock into the slot 31 under the action of gravity, thereby completing the positioning and locking of the insulating sheet 3 at the same time, which facilitates the subsequent fixing of the insulating sheet 3 and the clamp 2 and ensures that the insulating sheet 3 is not easily displaced during the fixing process. Compared with the traditional operation process that requires simultaneous alignment of the clamp 2 and the insulating sheet 3, this utility model simplifies the complex multi-directional alignment to a single-directional insertion, significantly reducing the complexity of the operation and improving the installation efficiency.

[0065] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A transformer core comprising a silicon steel sheet laminate (1), clamps (2) sandwiching both sides of the silicon steel sheet laminate (1), and an insulation sheet (3) provided between the silicon steel sheet laminate (1) and the clamps (2), characterized in that, Also includes: The positioning element (4) is fixedly mounted on the clamp (2) and has a socket (41) suitable for vertical insertion of the insulating sheet (3); and The locking member (5) is hinged to the positioning member (4) and has an elastic degree of freedom to rotate toward the socket (41); The insulating sheet (3) has a slot (31) along the horizontal direction suitable for engaging with the locking member (5). When the insulating sheet (3) is inserted into the socket (41), the locking member (5) engages with the slot (31) to restrict the insulating sheet (3) from being pulled out of the socket (41).

2. A transformer core as claimed in claim 1, characterized in that The positioning element (4) includes: Two side plates (42) are fixedly mounted on the clamp (2) and extend away from the clamp (2); the distance between the two side plates (42) is adapted to the width of the insulating sheet (3); Two folded edges (43) are respectively fixed on the two side plates (42) and extend towards each other; the distance between each folded edge (43) and the clamp (2) is adapted to the thickness of the insulating sheet (3); The base plate (44) is fixedly mounted on the clamp (2) and located between the two side plates (42) to limit the depth of the insulating sheet (3) inserted between the two side plates (42); The two side plates (42), the two folded edges (43), the bottom plate (44), and the clamp (2) form the socket (41).

3. A transformer core as claimed in claim 1, characterized in that The transformer core also includes: The limiting member (6) is inserted through the insulating sheet (3) and the clamp (2), and its two ends are respectively connected to the insulating sheet (3) and the clamp (2).

4. A transformer core as claimed in claim 3, characterised in that Both the insulating sheet (3) and the clamp (2) have connecting holes. When the insulating sheet (3) is inserted into the socket (41), the two connecting holes are aligned with each other so that the limiting member (6) passes through the two connecting holes at the same time.

5. A transformer core as claimed in claim 3, characterised in that The limiting member (6) includes: The connecting rod (61) passes through the insulating sheet (3) and the clamp (2); Two limiting parts (62) are respectively provided at both ends of the connecting rod (61) and have elastic degrees of freedom that extend radially from the inside of the connecting rod (61); One of the limiting parts (62) abuts against one of the insulating sheet (3) and the clamp (2), and the other limiting part (62) abuts against the other of the insulating sheet (3) and the clamp (2), so that the two limiting parts (62) clamp the insulating sheet (3) and the clamp (2).

6. A transformer core as claimed in claim 5, characterised in that The limiting part (62) includes: The limiting block (621) is slidably disposed on the connecting rod (61) along the radial direction of the connecting rod (61); The spring (622) is fixed at both ends to the limiting block (621) and the connecting rod (61) respectively, and is used to push the limiting block (621) out of the connecting rod (61).

7. A transformer core as claimed in claim 6, characterised in that The limiting block (621) is a wedge-shaped block; When the connecting rod (61) passes through the insulating sheet (3) or the clamp (2), the limiting block (621) can be pressed and retracted into the connecting rod (61).

8. A transformer core as defined in claim 1, wherein A spring piece (7) is fixedly provided on the positioning member (4). The spring piece (7) abuts against the locking member (5) to push the locking member (5) to rotate into the socket (41).

9. A transformer core as claimed in claim 8, characterised in that The hinge end of the locking member (5) is located at the insertion end of the positioning member (4).

10. A transformer core as claimed in claim 1, characterized in that The insulating sheet (3) has chamfers at both ends suitable for insertion into the socket (41).

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