Miniature 60A gradient magnetic conductivity anti-DC current transformer

Abstract

The utility model discloses a miniature 60A gradient magnetic conductivity direct-current-resistant current transformer which comprises a bottom shell, a winding magnetic ring, an electronic wire with a terminal and an epoxy glue layer. A shell cavity is formed in the bottom shell; a wire connecting seat extending upwards from the bottom along the shell wall is arranged in the shell cavity; a plurality of wire connecting grooves are formed in the wire connecting seat at intervals, and each wire connecting groove is provided with a through hole in the top surface of the wire connecting seat and one surface, opposite to the shell wall, of the wire connecting seat; each external connection end of the winding magnetic ring is correspondingly connected with one wiring end of the electronic wire with the terminal to form a connection part, and each connection part is reinforced by tin immersion; the winding magnetic ring is installed in the shell cavity, the electronic wire with the terminal is arranged outside the bottom shell, and the connecting part penetrates into the wire connecting groove and is positioned through the wire connecting groove. The epoxy glue layer is formed by pouring epoxy glue into the shell cavity after the winding magnetic ring and the electronic wire with the terminal are installed. According to the utility model, the size reduction and miniaturization of the mutual inductor can be realized under the condition that the connection between the winding magnetic ring and the electronic wire is not influenced.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter technology, and in particular to a miniature 60A gradient permeability DC current transformer. Background Technology

[0002] With fierce market competition in the electricity meter industry, there is a need to continuously reduce the size of electricity meters to reduce materials, lower costs, and increase prices and profits. To meet the requirements of electricity meter size reduction, current transformers of the same specifications also need to be miniaturized and reduced in size while maintaining measurement performance. In the process of miniaturizing and reducing the size of current transformers, the connection between the winding magnetic ring and the electronic wire is mainly through a copper wire running through the inside and outside of the transformer housing. However, as the size of the current transformer is reduced and miniaturized, the size of the copper wire also decreases and becomes miniaturized, making it more susceptible to accidental breakage and affecting the connection between the winding magnetic ring and the electronic wire. Utility Model Content

[0003] The purpose of this invention is to provide a miniature 60A gradient permeability DC current transformer.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A miniature 60A gradient permeability DC current transformer includes a base shell, a wound magnetic ring, terminal electronic wires, and an epoxy resin layer. The base shell has a cavity inside and an opening at its top communicating with the cavity. A connector seat is provided inside the cavity, extending upward from the bottom along the shell wall. Several connector slots are spaced apart on the connector seat. Each connector slot has an opening communicating with the cavity on the top surface of the connector seat and the side of the connector seat opposite the shell wall. The opening on the side of the connector seat opposite the shell wall extends downward from the top of the connector seat.

[0006] Each external terminal of the wound magnetic ring is connected to a terminal of the electronic wire with terminals to form a connection part, and each connection part is reinforced by tinning. The wound magnetic ring is installed in the housing cavity, and the electronic wire with terminals is set outside the bottom housing. Each connection part is inserted into a connecting groove of the connecting seat, and the connecting groove positions the connection part. The epoxy layer is formed by pouring epoxy into the housing cavity after the wound magnetic ring and the electronic wire with terminals are installed, and the epoxy layer plays a sealing role.

[0007] As a further technical solution of this utility model: the bottom shell is provided with a positioning sleeve in the shell cavity, and the bottom of the positioning sleeve penetrates the bottom wall of the bottom shell, so that the winding magnetic ring can be sleeved on the positioning sleeve.

[0008] As a further technical solution of this utility model: the height of the connector is less than the height of the cavity.

[0009] As a further technical solution of this utility model: the depth of the connecting groove is less than the height of the connecting seat, and the depth of the opening of the connecting groove on the side of the connecting seat opposite the shell wall is less than the depth of the connecting groove.

[0010] As a further technical solution of this utility model: the connecting groove is circular, and the opening of the connecting groove on the side of the connecting seat opposite the shell wall is rectangular with a width smaller than the diameter of the connecting groove.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model proposes a miniature 60A gradual permeability DC current transformer. Through the cooperation between the base shell, the wound magnetic ring, the terminal electronic wire, and the epoxy resin layer, and through its structural optimization, it can achieve the reduction and miniaturization of the transformer size without affecting the connection between the wound magnetic ring and the electronic wire. This accelerates the gradual change process of the magnetization curve of the magnetic core. With the outer diameter of the magnetic core being smaller than that of conventional 60A current-level similar products, it can meet the requirements of AC current measurement at this current level with the same accuracy, and at the same time meet the requirements of half-wave DC measurement of the same 60A current specification with the same accuracy. Attached Figure Description

[0012] Figure 1 This is an overall diagram of a miniature 60A gradually varying permeability DC current transformer.

[0013] Figure 2 This is a diagram showing the state before epoxy resin is filled into a miniature 60A graded permeability DC current transformer.

[0014] Figure 3 This is a schematic diagram of the bottom shell. Detailed Implementation

[0015] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of protection of this utility model.

[0016] Please see Figure 1 , Figure 2 and Figure 3A miniature 60A gradient permeability DC current transformer includes a bottom shell 10, a wound magnetic ring 20, an electronic wire with terminals 30, and an epoxy resin layer 40. The bottom shell 10 has a cavity 11 formed therein and an opening 111 at its top communicating with the cavity 11. The cavity 11 has a connecting seat 12 extending upward from the bottom along the shell wall. The connecting seat 12 has a plurality of connecting grooves 121 spaced apart. Each connecting groove 121 has an opening communicating with the cavity 11 on the top surface of the connecting seat 12 and the side of the connecting seat 12 opposite to the shell wall. The opening on the side of the connecting seat 12 opposite to the shell wall extends downward from the top of the connecting seat 12.

[0017] Each external terminal of the wound magnetic ring 20 is connected to a terminal of the electronic wire 30 with terminals to form a connection part, and each connection part is reinforced by tinning. The wound magnetic ring 20 is installed in the housing cavity 11, and the electronic wire 30 with terminals is set outside the bottom shell 10. Each connection part is inserted into a connection groove 121 of the connector 12, and the connection groove 121 positions the connection part. The epoxy adhesive layer 40 is formed by pouring epoxy adhesive into the housing cavity 11 after the wound magnetic ring 20 and the electronic wire 30 with terminals are installed, and the epoxy adhesive layer 40 plays a sealing role.

[0018] Furthermore, in this embodiment, the bottom shell 10 is provided with a positioning sleeve 13 in the shell cavity 11. The bottom of the positioning sleeve 13 penetrates the bottom wall of the bottom shell 10, so that the winding magnetic ring 20 can be sleeved on the positioning sleeve 13.

[0019] Furthermore, in this embodiment, the height of the connector 12 is less than the height of the cavity 11, so that the epoxy adhesive layer 40 encapsulates the cavity 11.

[0020] Furthermore, in this embodiment, the depth of the connecting groove 121 is less than the height of the connecting base 12, and the depth of the opening of the connecting groove 121 on the side of the connecting base 12 opposite to the shell wall is less than the depth of the connecting groove 121, so that the connecting groove 121 can position the connecting part.

[0021] Furthermore, in this embodiment, the connecting groove 121 is circular, and the opening of the connecting groove 121 on the side of the connecting seat 12 opposite to the shell wall is rectangular with a width smaller than the diameter of the connecting groove 121, so that the connecting groove 121 can position the connecting part.

[0022] Understandably, the assembly method of this utility model for a miniature 60A graded permeability DC current transformer includes the following steps: First, a coil is wound on a magnetic core to form the wound magnetic ring 20; Second, each external terminal of the wound magnetic ring 20 is connected to a terminal of the terminal electronic wire 30 to form a connection part, and each connection part is reinforced by tinning; Third, the wound magnetic ring 20 is installed in the housing cavity 11, the terminal electronic wire 30 is disposed outside the bottom shell 10, and each connection part is inserted into a connection groove 121 of the connection seat 12 to position the connection part; Fourth, epoxy resin is poured into the housing cavity 11 to form an epoxy resin layer 40 for encapsulation. Thus, the assembly of the miniature 60A gradient permeability DC current transformer is achieved. Through structural optimization, the size of the transformer can be reduced and miniaturized without affecting the connection between the wound magnetic ring 20 and the electronic wire. This accelerates the gradual change process of the magnetization curve of the magnetic core. With the outer diameter of the magnetic core being smaller than that of conventional 60A current-level products, it can meet the requirements for AC current measurement at this current level with the same accuracy, and at the same time meet the requirements for half-wave DC measurement of the same 60A current specification with the same accuracy.

[0023] In summary, this utility model's miniature 60A gradient permeability DC current transformer, through the optimized structure of the base shell 10, the wound magnetic ring 20, the terminald electronic wire 30, and the epoxy adhesive layer 40, achieves miniaturization and size reduction of the transformer without affecting the connection between the wound magnetic ring 20 and the electronic wire. This accelerates the gradual change process of the magnetic core's magnetization curve. While the outer diameter of the magnetic core is smaller than that of conventional 60A current-level products, it can meet the requirements for AC current measurement at this current level with the same accuracy, and simultaneously meet the requirements for half-wave DC measurement of the same 60A current specification with the same accuracy.

[0024] Any combination of different embodiments of this utility model, provided it does not violate the inventive concept of this utility model, shall be considered as the disclosure of this utility model; any simple modifications to the technical solution and any combination of different embodiments within the scope of the inventive concept of this utility model, without violating the inventive concept of this utility model, shall be within the protection scope of this utility model.

Claims

1. A miniature 60 A graded permeability DC current proof current transformer characterized by: The utility model relates to a bottom shell (10), winding magnetic ring (20), take terminal electronic wire (30) and epoxy glue layer (40) are included, the bottom shell (10) is formed with shell cavity (11) in it and is equipped with the cavity mouth (111) of intercommunication shell cavity (11) at its top, the shell cavity (11) is equipped with the connecting wire seat (12) that extends upwards from the bottom along the shell wall in it, the connecting wire seat (12) is equipped with several connecting wire grooves (121) at interval, every connecting wire groove (121) is equipped with the through hole that communicates with shell cavity (11) on the top surface of connecting wire seat (12) and the opposite side of connecting wire seat (12) shell wall, and the through hole on the opposite side of connecting wire seat (12) shell wall extends from the top of connecting wire seat (12) downwards, Every outer connection end of winding magnetic ring (20) corresponds with the connection of take terminal electronic wire (30) one wire end and forms a connecting part, and every connecting part is reinforced with immersion tin, winding magnetic ring (20) is installed into shell cavity (11), take terminal electronic wire (30) is arranged outside bottom shell (10), every connecting part corresponds and is inserted into the connecting wire groove (121) of connecting wire seat (12) to be positioned with connecting wire groove (121), the epoxy glue layer (40) is formed by filling epoxy glue into shell cavity (11) after the installation of winding magnetic ring (20) and take terminal electronic wire (30), and the epoxy glue layer (40) plays the sealing effect.

2. The micro 60 A graded permeability DC blocking current transformer of claim 1, wherein: The bottom shell (10) is equipped with the positioning sleeve (13) in shell cavity (11), the bottom of positioning sleeve (13) penetrates the bottom wall of bottom shell (10), and the winding magnetic ring (20) is sleeved on the positioning sleeve (13).

3. The micro 60 A graded permeability DC blocking current transformer of claim 1, wherein: The height of the connecting wire seat (12) is less than the height of the shell cavity (11).

4. The micro 60 A graded permeability DC blocking current transformer of claim 1, wherein: The depth of the connecting wire groove (121) is less than the height of the connecting wire seat (12), and the depth of the through hole of the connecting wire groove (121) on the opposite side of the connecting wire seat (12) shell wall is less than the depth of the connecting wire groove (121).

5. The micro 60 A graded permeability DC blocking current transformer of claim 1, wherein: The connecting wire groove (121) is circular, and the through hole of the connecting wire groove (121) on the opposite side of the connecting wire seat (12) shell wall is rectangular with a width less than the diameter of the connecting wire groove (121).

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