A small volume current transformer

Abstract

The utility model relates to a current transformer technical field especially a small size current transformer, including casing, magnetic core, coil, the hollow annular cavity is formed in the casing inside, and the positioning post is formed in the casing middle part, is provided with the through -hole at the positioning post center, and a layer of insulating paint is coated outside the magnetic core, and after the insulating paint hardens, the coil is wound on the magnetic core, two secondary output lead pins are connected on the coil, the secondary output lead pin extends to the casing outside, and the magnetic core that is wound with the coil is equipped on the positioning post, and the casing inside fills glue seal, and the primary input copper spare is worn in the through -hole. The small size current transformer obtained by the utility model cancels the protective casing outside the magnetic core, adopts coating insulating paint, and after the insulating paint hardens, the coil is wound, the insulating paint forms the protection layer, avoids the damage of coil to the magnetic core, can effectively reduce the size of coil simultaneously, finally forms the small size current transformer, and promotes its applicability.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, and in particular to a small-volume current transformer. Background Technology

[0002] In existing technology, current transformers typically consist of a magnetic core inside a housing, a protective housing outside the core, and then a coil wound around it. This design is advantageous because the coil is under tension during winding, and directly winding it onto the magnetic core would damage the core and affect performance. However, adding a protective housing increases the overall coil diameter, resulting in a larger transformer size, making it unsuitable for small devices.

[0003] Therefore, there is an urgent need to develop a small-sized current transformer. Utility Model Content

[0004] To address the aforementioned technical shortcomings, this invention provides a small-volume current transformer that can reduce the overall size while ensuring performance, thereby improving applicability.

[0005] This utility model discloses a small-volume current transformer, including a housing, a magnetic core, and a coil. The housing has a hollow annular cavity inside, a positioning post in the middle of the housing, and a through hole in the center of the positioning post. The magnetic core is coated with an insulating varnish. After the insulating varnish hardens, a coil is wound on the magnetic core. Two secondary output pins are connected to the coil and extend to the outside of the housing. The magnetic core with the coil is sleeved on the positioning post. The inside of the housing is sealed with glue. A primary input copper component is inserted through the through hole.

[0006] A voltage measuring copper needle is installed on the copper input component.

[0007] The through hole is cross-shaped.

[0008] The primary input copper component is a copper sheet, which is divided into two parts: a straight copper sheet and an L-shaped copper sheet. The width of the straight copper sheet is the same as the width of the cross-shaped through hole. One side of the middle part of the straight copper sheet protrudes outward to form a limiting part. The straight copper sheet passes through the through hole, and the limiting part abuts against one end of the housing. The end of the straight copper sheet that passes through the housing is welded to the L-shaped copper sheet. The inner side of the L-shaped copper sheet abuts against the end and side wall of the housing respectively. The middle part of the straight copper sheet is bent so that it is on the same plane as the L-shaped copper sheet.

[0009] Mounting holes are provided on the straight copper sheet and the L-shaped copper sheet.

[0010] The assembly end of the straight copper sheet and the L-shaped copper sheet is provided with a concave texture.

[0011] The present invention provides a small-volume current transformer that eliminates the protective shell outside the magnetic core. Instead, it uses an insulating varnish coating. After the varnish hardens, the coil is wound around it. The insulating varnish forms a protective layer, preventing the coil from damaging the magnetic core. At the same time, it can effectively reduce the size of the coil, ultimately forming a small-volume current transformer and improving its applicability. Attached Figure Description

[0012] Figure 1 This is a front view of the structure of this utility model;

[0013] Figure 2 This is a side view of the structure of this utility model;

[0014] Figure 3 This is a top view of the structure of this utility model;

[0015] Figure 4 This is a bottom view of the structure of this utility model;

[0016] Figure 5 for Figure 1 Schematic diagram of the cross section of AA;

[0017] Figure 6 The structural three-dimensional representation of this utility model Figure 1 ;

[0018] Figure 7 The structural three-dimensional representation of this utility model Figure 2 . Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0020] Example 1:

[0021] like Figures 1-7 As shown, this utility model discloses a small-volume current transformer, including a housing 1, a magnetic core 8, and a coil 10. The housing 1 forms a hollow annular cavity inside, and a positioning post 7 is formed in the middle of the housing 1. A through hole 6 is provided in the center of the positioning post 7. An insulating varnish 9 is coated on the outside of the magnetic core 8. After the insulating varnish 9 hardens, the coil 10 is wound on the magnetic core 8. Two secondary output pins 3 are connected to the coil 10. The secondary output pins 3 extend to the outside of the housing 1. The magnetic core 8 with the coil 10 wound on it is sleeved on the positioning post 7. The inside of the housing 1 is sealed with glue. A primary input copper piece 2 is inserted into the through hole 6.

[0022] A magnetic core 8 is fitted onto a positioning post 7 inside the housing 1. An insulating varnish 9 is coated onto the magnetic core 8. After curing, the insulating varnish 9 forms a hard protective layer. The thickness of this protective layer is smaller than the thickness of the protective housing 1 assembled outside the magnetic core 8 in existing technologies. Therefore, when a coil 10 is wound around the magnetic core 8 coated with insulating varnish 9, the overall volume is reduced if the number of turns and wire diameter of the coil 10 are consistent. This allows for a reduction in the size of the housing 1, thereby reducing the overall volume of the current transformer and creating a smaller current transformer without affecting performance. The hardened insulating varnish 9 prevents damage to the magnetic core 8 from the coil 10 during winding, improving safety and product quality. The housing 1 encloses the magnetic core 8 and coil 10 internally. The secondary output pin 3 is fixed to the housing 1 and extends from the inside to the outside. Sealing the inside of the housing 1 with glue is a conventional method.

[0023] A voltage measuring copper needle 4 is provided on the primary input copper component 2. Voltage measurement can be achieved through the design of the voltage measuring copper needle 4. One end of the voltage measuring copper needle 4 is fixed to the primary input copper component 2, and its middle portion can be fixedly connected to the housing 1. The voltage measuring copper needle 4 and the primary input copper component 2 can be connected by welding.

[0024] The through-hole 6 is cross-shaped. Since the primary input copper piece 2 is a copper sheet, the cross-shaped through-hole 6 allows the copper sheet to be inserted and fixed into any one of the channels of the cross-shaped through-hole 6 as needed in actual use. The secondary output pin 3 is fixed to the housing 1, and its position remains unchanged. However, when the primary input copper piece 2 is inserted into two different channels of the cross-shaped through-hole 6, the relative position between the primary input copper piece 2 and the secondary output pin 3 changes, thus adapting to different assembly requirements.

[0025] The primary input copper piece 2 is a copper sheet, which is divided into two parts: a straight copper piece 21 and an L-shaped copper piece 22. The width of the straight copper piece 21 is the same as the width of the cross-shaped through hole 6. One side of the middle part of the straight copper piece 21 protrudes outward to form a limiting part 23. The straight copper piece 21 passes through the through hole 6, and the limiting part 23 abuts against one end of the housing 1. The end of the straight copper piece 21 that passes through the housing 1 is welded to the L-shaped copper piece 22. The inner side of the L-shaped copper piece 22 abuts against the end and side wall of the housing 1 respectively. The middle part of the straight copper piece 21 is bent to be on the same plane as the L-shaped copper piece 22.

[0026] The primary input copper piece 2 is a copper sheet, the width of which is the same as the width of the cross-shaped through hole 6. To facilitate the insertion of the primary input copper piece 2 into the through hole 6 and to fix the housing 1 on the primary input copper piece 2, the primary input copper piece 2 is divided into a straight copper piece 21 and an L-shaped copper piece 22. The straight copper piece 21 is directly inserted into the through hole 6, with a limiting part 23 set in its middle. Then, the end of the straight copper piece 21 that passes through the housing 1 is welded with the L-shaped copper piece 22. The inner side of the L-shaped copper piece abuts against the end and side wall of the housing 1. In this way, the primary input copper piece 2 fixes the housing 1 on top of it, preventing slippage and making it more stable during use. Moreover, this design is compact and has a smaller overall size. However, since the ends of the straight copper piece 21 and the L-shaped copper piece 22 are welded together, and both have the same thickness, there is a height difference between their terminals. Therefore, the straight copper piece 21 is bent so that its terminal is on the same plane as the L-shaped copper piece 22, facilitating installation.

[0027] Mounting holes 5 are provided on the straight copper sheet 21 and the L-shaped copper sheet 22. The mounting holes 5 are used for installing wiring.

[0028] The mounting ends of the straight copper sheet 21 and the L-shaped copper sheet 22 are provided with concave grooves 24. The concave grooves 24 make the mounting and wiring more secure and stable.

[0029] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the interaction relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simplification, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A small-volume current transformer, comprising a housing, a magnetic core, and a coil, characterized in that: The shell has a hollow annular cavity inside, a positioning post in the middle of the shell, a through hole in the center of the positioning post, an insulating varnish coating on the outside of the magnetic core, and after the insulating varnish hardens, a coil is wound on the magnetic core, two secondary output pins are connected to the coil, the secondary output pins extend to the outside of the shell, the magnetic core with the coil is sleeved on the positioning post, and the inside of the shell is sealed with glue; a primary input copper piece is inserted through the through hole.

2. A small-volume current transformer according to claim 1, characterized in that: A voltage measuring copper needle is installed on the copper input component.

3. A small-volume current transformer according to claim 1, characterized in that: The through hole is cross-shaped.

4. A small-volume current transformer according to claim 3, characterized in that: The primary input copper component is a copper sheet, which is divided into two parts: a straight copper sheet and an L-shaped copper sheet. The width of the straight copper sheet is the same as the width of the cross-shaped through hole. One side of the middle part of the straight copper sheet protrudes outward to form a limiting part. The straight copper sheet passes through the through hole, and the limiting part abuts against one end of the housing. The end of the straight copper sheet that passes through the housing is welded to the L-shaped copper sheet. The inner side of the L-shaped copper sheet abuts against the end and side wall of the housing respectively. The middle part of the straight copper sheet is bent so that it is on the same plane as the L-shaped copper sheet.

5. A small-volume current transformer according to claim 4, characterized in that: Mounting holes are provided on the straight copper sheet and the L-shaped copper sheet.

6. A small-volume current transformer according to claim 4, characterized in that: The assembly end of the straight copper sheet and the L-shaped copper sheet is provided with a concave texture.

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