A structure of a core-type mutual inductor

Abstract

The utility model discloses a kind of through-core mutual inductor structures, it includes secondary coil, cushion block and insulating shell, the secondary coil is wound into annular shape;The cushion block quantity is at least two, the accommodating groove that is adapted with secondary coil is equipped on the cushion block, the cushion block is set at the outer periphery of secondary coil, and is matched with secondary coil by accommodating groove;The insulating shell is formed by pouring with insulating material outside secondary coil and cushion block, four corners of the insulating shell are equipped with a through hole that penetrates the insulating shell.The whole production process of the through-core mutual inductor of the utility model is more simple to operate, subsequent repair operation is also unnecessary, and good product rate is also effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of current transformer structure, specifically to a through-type current transformer structure. Background Technology

[0002] Through-hole current transformers are a very practical and common current measuring device in power systems. Currently, the structure of a through-hole inductor includes a secondary coil and an insulating shell cast around it. This structure leads to complex production operations and a high product scrap rate. Specifically, during the casting of the insulating shell, the secondary coil needs to be installed in the mold, and its position within the mold cavity needs to be adjusted using bolts around the perimeter to prevent contact between the secondary coil and the mold, making the operation complex. After demolding, the bolt holes also need to be repaired and dyed, resulting in an unsightly appearance. Furthermore, excessive casting can cause coil deformation, leading to substandard performance in the final product and a high scrap rate. Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of this utility model is to provide a through-hole current transformer structure to reduce the complexity of through-hole current transformer production and improve the production yield.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A through-type current transformer structure includes a secondary coil, pads, and an insulating shell. The secondary coil is wound into a ring shape. There are at least two pads, each with a receiving groove adapted to the secondary coil. The pads are disposed on the outer periphery of the secondary coil and cooperate with the secondary coil through the receiving groove. The insulating shell is formed by casting insulating material around the secondary coil and the pads. Each of the four corners of the insulating shell has a through hole penetrating the insulating shell.

[0005] The upper and lower surfaces of the pad are provided with support protrusions.

[0006] The number of pads is four, and the four pads are respectively set at the four corners of the secondary coil. The through hole penetrates the pads and the insulating shell.

[0007] The through hole and the receiving groove are isolated from each other.

[0008] The outer edge of the accommodating groove is rounded.

[0009] The bottom of the receiving groove is an arc surface adapted to the angle of the secondary coil.

[0010] The insulating outer shell is made of epoxy resin material.

[0011] The pad is made of insulating material.

[0012] The pad and the insulating shell are made of the same material.

[0013] The opening of the receiving slot faces the direction of the secondary coil.

[0014] After adopting the above solution, the present invention adds a pad to the outer periphery of the secondary coil, which provides support for the secondary coil. This eliminates the need for bolts in the casting mold. The secondary coil with the pad is simply placed into the mold cavity for casting to form an insulating shell, thus completing the production of the through-core current transformer. The entire production process is simpler, and no subsequent repair operations are required, effectively improving the yield rate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the through-type current transformer of this utility model; Figure 2 for Figure 1 Exploded structural diagram; Figure 3 for Figure 1 A sectional view; Figure 4 This is a schematic diagram of the pad block structure.

[0016] Label Explanation: Secondary coil 10; 20; 21; 211; 212; 22; 23; 24; Insulating outer casing 30. Detailed Implementation

[0017] like Figure 1-4 As shown, this utility model discloses a through-type current transformer structure, which includes a secondary coil 10, spacers 20, and an insulating shell 30. The secondary coil 10 is wound into a ring shape. There are at least two spacers 20, each with a receiving groove 21 adapted to the secondary coil 10. The spacers 20 are disposed on the outer periphery of the secondary coil 10 and engage with the secondary coil 10 through the receiving groove 21. The insulating shell 30 is formed by casting insulating material around the secondary coil 10 and spacers 20. Each of the four corners of the insulating shell 30 has a through hole 23 penetrating through the insulating shell 30.

[0018] This invention adds at least two pads 20 as support members for the secondary coil 10. Therefore, when the secondary coil 10 is placed into the mold cavity for casting, the pads 20 are simply fitted onto the outside of the secondary coil 10 through the receiving groove 21, and then the secondary coil 10 is placed into the mold cavity for casting to form an insulating shell 30. There is no need to use bolts to position the secondary coil 10, which makes the operation of the through-core current transformer production simpler and effectively improves the yield rate.

[0019] To improve the flatness of the upper and lower surfaces of the insulating housing 30, support protrusions 22 are provided on both the upper and lower surfaces of the pad 20. The pad 20 is also made of insulating material. Furthermore, the pad 20 and the insulating housing 30 are made of the same material; for example, both the pad 20 and the insulating housing 30 are made of epoxy resin.

[0020] In this embodiment, four pads 20 are provided, and the four pads 20 are respectively provided at the four corners of the secondary coil 10. At this time, through holes 23 are provided on the pads 20 and penetrate through the pads 20 and the insulating shell 30. Furthermore, the through holes 23 are isolated from the receiving grooves 21 to ensure the insulation performance of the coil.

[0021] In this embodiment, the opening of the receiving groove 21 faces the secondary coil 10. The bottom 211 of the receiving groove 21 is an arc surface adapted to the corner of the secondary coil 10, ensuring the stability of the fit between the pad 20 and the secondary coil 10 and preventing the secondary coil 10 from moving during the casting process and affecting its performance. In addition, in this embodiment, the outer edge 212 of the groove opening of the receiving groove 21 is rounded.

[0022] In summary, this utility model adds a pad 20 to the outer periphery of the secondary coil 10, providing support for the secondary coil 10. This eliminates the need for bolts in the casting mold. The secondary coil 10 with the pad 20 is simply placed into the mold cavity for casting to form the insulating shell 30, thus completing the production of the through-core current transformer. The entire production process is simpler, and no subsequent repair operations are required, effectively improving the yield rate.

[0023] The above description is merely an embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A through-type current transformer structure, characterized in that: The device includes a secondary coil, spacers, and an insulating shell. The secondary coil is wound into a ring shape. There are at least two spacers, each with a receiving groove adapted to the secondary coil. The spacers are positioned on the outer periphery of the secondary coil and engage with it through the receiving groove. The insulating shell is formed by casting insulating material around the secondary coil and spacers. Each of the four corners of the insulating shell has a through hole penetrating the shell.

2. The through-type current transformer structure according to claim 1, characterized in that: The upper and lower surfaces of the pad are provided with support protrusions.

3. The through-type current transformer structure according to claim 1, characterized in that: The number of pads is four, and the four pads are respectively set at the four corners of the secondary coil. The through hole penetrates the pads and the insulating shell.

4. The through-type current transformer structure according to claim 3, characterized in that: The through hole and the receiving groove are isolated from each other.

5. The through-type current transformer structure according to claim 2, characterized in that: The outer edge of the accommodating groove is rounded.

6. The through-type current transformer structure according to claim 1, characterized in that: The bottom of the receiving groove is an arc surface adapted to the angle of the secondary coil.

7. The through-type current transformer structure according to claim 1, characterized in that: The insulating outer shell is made of epoxy resin material.

8. The through-type current transformer structure according to claim 1, characterized in that: The pad is made of insulating material.

9. A through-type current transformer structure according to claim 8, characterized in that: The pad and the insulating shell are made of the same material.

10. The through-type current transformer structure according to claim 1, characterized in that: The opening of the receiving slot faces the direction of the secondary coil.

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