A multi-core combined current transformer

Abstract

This utility model discloses a multi-core combined current transformer, relating to the field of current transformer technology. Addressing the problems of poor core assembly consistency, high housing cost and lack of universality, and easy confusion of input and output wires in existing designs, a modular housing structure is adopted: the housing consists of upper and lower shells with snap-fit ​​fasteners to fix the cores, with pin positions for winding input and output wires to avoid confusion and breakage; positioning holes / posts on the housing achieve precise positioning between cores and with the housing / PCB, eliminating the need for overall casting; a support platform between the housings replaces the insulating pad. Cores can be stacked (e.g., 2-4), with the lower housing adaptable to the PCB or housing, and the rest being standard models. This utility model improves assembly efficiency, reduces production costs, and enhances versatility and reliability.

Description

Technical Field

[0001] This utility model belongs to the field of current transformer technology, specifically relating to a multi-core combined current transformer. Background Technology

[0002] Traditional multi-core combined instrument transformers have the following existing technologies and defects in the assembly process: Existing technology 1: After each magnetic core is wound individually, the inlet and outlet wires (tap) are distinguished by heat shrink tubing of different colors; multiple magnetic cores of the same specification (such as three) are stacked face up, isolated by insulating plates, and the tap positions are manually aligned and then fixed with tape; the whole assembly is wound a second time (such as T4 winding); after winding, the whole assembly is installed into the shell and cast and cured.

[0003] However, the existing technology has the following drawbacks: additional insulating pads and other isolation structures are required between magnetic cores; the incoming and outgoing wires are easily confused, the reserved length is difficult to control, and there is a risk of wire breakage before overall winding; multiple sets of incoming and outgoing wires need to be strictly distinguished, which reduces production efficiency; the structure is loose, relying on manual alignment and tape fixation, resulting in poor consistency.

[0004] Existing technology 2: The magnetic core is wound separately and then the inlet and outlet wires are separated by heat shrink tubing; after the magnetic cores are stacked, they are aligned with the outlet position of the special protective shell, fixed with tape, and then placed into the custom protective shell; the wires are wound a second time and wrapped around the pins of the protective shell before being dipped in tin; after the whole assembly is installed into the outer shell, it is poured and cured.

[0005] However, the existing technology 2 has the following drawbacks: the protective shell needs to be customized for specific magnetic cores, resulting in poor versatility and high cost; it still requires manual differentiation of incoming and outgoing wires, leading to low production efficiency; and it relies on an overall casting and curing process, which increases manufacturing costs.

[0006] Existing technology 3: There is no fixed structure between the magnetic cores, the magnetic cores are not covered by a protective shell, and they are directly stacked and used; it relies on the overall winding process.

[0007] However, the existing technology has the following drawbacks: the deviation of the magnetic core position leads to the loss of control over the reserved length of the input and output lines, resulting in a high risk of wire breakage; multiple sets of input and output lines need to be strictly distinguished manually, resulting in low installation efficiency; the magnetic core does not have a protective shell and needs to be sprayed, and the thickness of the coating is not precise. The current thickness is about 0.1 to 0.3, and each one will have an error, which is also relatively high in cost.

[0008] In summary, existing technologies suffer from drawbacks such as poor consistency in magnetic core assembly, low assembly efficiency, high customization costs, and a high risk of wire breakage. Utility Model Content

[0009] The purpose of this utility model embodiment is to provide a multi-core combined current transformer, which fixes a single magnetic core through the snap-fit ​​structure of the upper and lower protective shells, eliminating the risk of magnetic core displacement caused by traditional tape / pad fixing, and ensuring that the position of multiple magnetic cores is accurate and uniform when combined, thereby solving at least one of the technical problems involved in the background art.

[0010] To solve the above-mentioned technical problems, this utility model is implemented as follows: This utility model embodiment provides a multi-core combined current transformer, including: Multiple independent magnetic core modules, each magnetic core module including: magnetic core; The protective shell consists of an upper shell and a lower shell that can be snapped together. The upper shell and the lower shell are fixed together by a snap-fit ​​structure, and the magnetic core is assembled between the upper shell and the lower shell. The pin insertion position is located on the protective shell and is used to fix the inlet and outlet taps after the magnetic core is wound. The positioning structure, set on the surface of the housing, includes mutually cooperating positioning holes and positioning posts for stacking positioning between adjacent magnetic core modules, as well as positioning of the bottom magnetic core module and the external mounting base; The support platform, protruding from the surface of the protective shell, is taller than the diameter of the enameled wire and is used to provide support and clearance space for the enameled wire when the magnetic core modules are stacked.

[0011] Optionally, the pins of the pin position are integrally formed with the protective shell through in-mold injection molding, or fixed in the pre-set holes of the protective shell through a post-insertion process.

[0012] Optionally, the protective shell is divided into a standard version and an adapter version; the adapter version is located at the bottom of the stacked structure, and its lower shell shape is adapted to the mounting interface of the PCB board or the outer shell; the remaining protective shells use the standard version.

[0013] Optionally, the number of magnetic core modules is 2, 3 or 4, which are stacked and combined by positioning structure.

[0014] Optionally, the stacked magnetic core modules are secured with tape and then wound together as a whole.

[0015] Compared with the prior art, the advantages of this utility model are as follows: (1) This utility model fixes a single magnetic core by the snap-fit ​​structure of the upper and lower protective shells, eliminating the risk of magnetic core displacement caused by traditional tape / pad fixing, ensuring that the position is accurate and uniform when multiple magnetic cores are combined, and solving the problem of "poor consistency of magnetic core combination" in the background technology.

[0016] (2) The protective shell of this utility model integrates a standardized pin position. After winding the wire, the tap is directly wound to the corresponding pin (hole position or in-mold injection pin), avoiding the tedious process of manually distinguishing heat shrink tubing labels, effectively preventing confusion between incoming and outgoing wires, and reducing the risk of wire breakage.

[0017] (3) The positioning hole / post design of this utility model enables rapid positioning between magnetic cores and precise docking with PCB / shell, eliminating the need for overall casting and curing; the support platform with a shell depth greater than that of the enameled wire replaces the insulating pad, reducing the use of auxiliary materials. Together, they solve the defects of "high cost and lack of versatility of special shells".

[0018] (4) The standard protective shell of this utility model supports the free stacking of magnetic cores (such as 2 / 3 / 4 combinations). The bottom protective shell can be customized to adapt to different application scenarios, breaking through the size limitation of traditional fixed shells and meeting the diverse magnetic core parameter requirements.

[0019] (5) The modular design of this utility model allows for pre-assembly of the magnetic core and independent winding, simplifying the overall winding process; the standardization of the pin positions reduces the wiring error rate and shortens the assembly time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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, wherein: Figure 1 A schematic diagram of the overall structure of the multi-core combined current transformer provided by this utility model; Figure 2 A partial cross-sectional view of the multi-core combined current transformer provided by this utility model; Figure 3 A schematic diagram of the magnetic core module provided by this utility model; Figure 4 A schematic diagram of the upper shell provided by this utility model. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] Please see Figures 1 to 3 As shown, this utility model embodiment provides a multi-core combined current transformer, including multiple independent core modules 1. The number of core modules 1 is 2, 3 or 4. They are stacked and combined by a positioning structure. The stacked core modules 1 are fixed by tape and then wound as a whole. The modular design of the core modules 1 allows for pre-assembly and independent winding of the cores, simplifying the overall winding process.

[0024] Each magnetic core module 1 includes a magnetic core 11, a protective shell 12, a pin position 13, a positioning structure 14, and a support platform 15.

[0025] The protective shell 12 consists of an upper shell 121 and a lower shell 122 that can be snapped together. The upper shell 121 and the lower shell 122 are fixed together by a snap-fit ​​structure 123, and the magnetic core 11 is assembled between the upper shell 121 and the lower shell 122. By fixing a single magnetic core 11 through the snap-fit ​​structure of the upper and lower shells, the risk of magnetic core displacement caused by traditional tape / pad fixing is eliminated, ensuring that the position of multiple magnetic cores is accurate and uniform when combined, thus solving the problem of "poor consistency of magnetic core assembly" in the background technology.

[0026] In one specific embodiment, the protective shell 12 is divided into a standard version and an adapter version; the adapter version is located at the bottom layer of the stacked structure, and its lower shell shape is adapted to the mounting interface of the PCB board or external shell; the remaining protective shells adopt the standard version. The standard protective shell supports the free stacking of magnetic cores (such as a combination of 2 / 3 / 4 cores), and the bottom protective shell can be customized to adapt to different application scenarios, breaking through the size limitations of traditional fixed shells and meeting diverse magnetic core parameter requirements.

[0027] The pin position 13 is provided on the protective shell 12 and is used to fix the inlet and outlet taps of the wound magnetic core 11.

[0028] In one specific embodiment, the pin of the pin position 13 is integrally formed with the protective shell 12 by in-mold injection molding, or is fixed in the preset hole of the protective shell 12 by post-insertion process.

[0029] The protective shell 12 integrates standardized pin positions 13. After winding, the tap can be directly wound to the corresponding pin 131 (hole or in-mold injection pin), avoiding the tedious process of manually distinguishing heat shrink tubing labels, effectively preventing confusion between incoming and outgoing wires, and reducing the risk of wire breakage. The standardized pin positions reduce the wiring error rate and shorten the assembly time.

[0030] Combined Figure 4 As shown, the positioning structure 14 is disposed on the surface of the protective shell 12, including positioning holes 141 and positioning posts 142 that cooperate with each other, for stacking positioning between adjacent magnetic core modules 1, and positioning of the bottom magnetic core module and the external mounting base.

[0031] The positioning structure 14 adopts a positioning hole / column design to achieve rapid positioning between magnetic cores and precise docking with PCB / shell, eliminating the need for overall casting and curing.

[0032] The support platform 15 protrudes from the surface of the housing 12, and its height is greater than the diameter of the enameled wire. It is used to provide support and clearance space for the enameled wire when the magnetic core modules 1 are stacked. The support platform 15, whose depth is greater than that of the enameled wire, replaces the insulating pad, reducing the use of auxiliary materials. Together, they solve the defects of "high cost and lack of universality of specially made housings".

[0033] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0034] Furthermore, it should be noted that the scope of the methods and systems in the embodiments of this utility model is not limited to performing functions in the order shown or discussed. It may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0035] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A multi-core combined current transformer, characterized in that, include: Multiple independent magnetic core modules (1), each magnetic core module (1) comprising: Magnetic core (11); The protective shell (12) is composed of an upper shell (121) and a lower shell (122) that can be snapped together. The upper shell (121) and the lower shell (122) are fixed by a snap-fit ​​structure (123). The magnetic core (11) is assembled between the upper shell (121) and the lower shell (122). The pin position (13) is set on the protective shell (12) and is used to fix the inlet and outlet taps after the magnetic core is wound. The positioning structure (14) is provided on the surface of the protective shell (12), including positioning holes (141) and positioning posts (142) that cooperate with each other, for stacking positioning between adjacent magnetic core modules (1), and positioning of the bottom magnetic core module (1) and the external mounting base; The support platform (15) protrudes from the surface of the housing (12) and its height is greater than the diameter of the enameled wire. It is used to provide support and space for the enameled wire to avoid when the magnetic core modules (1) are stacked.

2. The multi-core combined current transformer according to claim 1, characterized in that: The pin (131) of the pin position (13) is integrally formed with the protective shell by in-mold injection molding process, or is fixed in the pre-set hole of the protective shell by post-insertion process.

3. The multi-core combined current transformer according to claim 1, characterized in that: The protective shell (12) is divided into a standard version and an adapter version; the adapter version is set at the bottom layer of the stacked structure, and its lower shell shape is adapted to the mounting interface of the PCB board or the outer shell; the other protective shells adopt the standard version.

4. The multi-core combined current transformer according to claim 1, characterized in that: The number of magnetic core modules (1) is 2, 3 or 4, which are stacked and combined by positioning structure.

5. The multi-core combined current transformer according to any one of claims 1-4, characterized in that: The stacked magnetic core modules (1) are fixed by binding with tape and then wound together as a whole.

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