Current transformer and electric energy meter

Abstract

The utility model discloses a current transformer and an electric energy meter. The current transformer comprises a transformer body, a voltage sampling needle and a limiting piece. The mutual inductor body comprises a shell and a conducting strip; the voltage sampling needle is connected with the conducting strip, and part of the voltage sampling needle extends in the first direction; the limiting piece comprises a first wall plate and a first buckle, the first wall plate extends in the first direction, the first buckle is connected with the first wall plate, the first buckle comprises a first clamping hook part, the first clamping hook part and the first wall plate are arranged in a spaced mode in the second direction, and part of the voltage sampling needle is limited between the first wall plate and the first clamping hook part; the limiting piece is provided with a through hole penetrating through the first wall plate in the second direction, and the first clamping hook part and the through hole are oppositely arranged. According to the limiting piece, the through hole and the first clamping hook part are oppositely arranged, after the limiting piece is subjected to injection molding, part of the mold structure can retreat from the through hole, demolding is facilitated, a complex demolding mechanism does not need to be designed, the mold design is simplified, and the production cost is reduced.

Description

Technical Field

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

[0002] An electricity meter is an instrument used to measure electricity consumption. Electricity meters are equipped with current transformers. Currently, most current transformers transmit voltage and current sampling signals via pins. In related technologies, due to the relatively long sampling pins, some current transformers incorporate limiting structures to protect the pins from deformation. However, these limiting structures themselves are complex, requiring sophisticated tooling or molds for manufacturing, resulting in high production costs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a current transformer and an energy meter. The current transformer, by providing a through hole opposite to the first hook portion, allows part of the mold structure used to form the first hook portion to exit from the through hole, which facilitates demolding, simplifies mold design, and reduces production costs.

[0004] The current transformer according to a first aspect embodiment of the present invention includes:

[0005] The transformer body includes a housing and a conductive sheet passing through the housing;

[0006] A voltage sampling needle is connected to the conductive sheet, and a portion of the voltage sampling needle extends along a first direction;

[0007] A limiting component is integrally injection molded with the outer shell. The limiting component includes a first wall plate and a first buckle. The first wall plate extends along a first direction, and the first buckle is connected to the first wall plate. The first buckle includes a first hook portion, which is spaced apart from the first wall plate along a second direction. The second direction is perpendicular to the first direction. A portion of the voltage sampling needle is located between the first wall plate and the first hook portion. The limiting component has a through hole that penetrates the first wall plate along the second direction, and the first hook portion is disposed opposite to the through hole.

[0008] The current transformer according to the first aspect of the present invention has at least the following beneficial effects:

[0009] By setting a limiting component, which includes a first wall plate and a first buckle connected to the first wall plate, both the first wall plate and a portion of the voltage sampling needles extend along a first direction. The first buckle includes a first hook portion, and the first hook portion and the first wall plate are spaced apart along a second direction. This limits the voltage sampling needles to be positioned between the first wall plate and the first hook portion, thus limiting the voltage sampling needles along the second direction. This reduces the risk of bending and deformation of the voltage sampling needles during production and transportation, and facilitates smooth insertion of the voltage sampling needles when assembling the current transformer with other electronic components, improving assembly efficiency. In this invention, the limiting component and the outer shell are integrally injection molded. Furthermore, by providing a through hole penetrating the first wall plate along the second direction, with the through hole opposite to the first hook portion, after the limiting component and the outer shell are injection molded, part of the mold structure used to form the first hook portion can exit through the through hole, facilitating demolding. This eliminates the need for a complex demolding mechanism for the first hook portion, simplifying mold design and reducing production costs.

[0010] According to some embodiments of the present invention, the outer shell is provided with a connecting arm. Along the first direction, the side of the connecting arm facing the conductive sheet is the first side, and the side of the connecting arm away from the conductive sheet is the second side. The voltage sampling needle includes a first needle body and a second needle body connected to each other. The first needle body is located on the first side and connected to the conductive sheet. One end of the second needle body is connected to the first needle body, and the other end extends along the first direction to the second side.

[0011] The first wall panel is connected to the connecting arm, and the first buckle is connected to the portion of the first wall panel located on the second side.

[0012] According to some embodiments of the present invention, the limiting member further includes two second wall plates, both of which extend along the first direction and are respectively connected to the first wall plate. The two second wall plates are arranged opposite each other along a third direction, which is perpendicular to the first direction and the second direction. The first wall plate and the two second wall plates enclose each other to form a limiting groove, and the voltage sampling needle passes through the limiting groove. At least one of the second wall plates is provided with the first buckle.

[0013] According to some embodiments of the present invention, the limiting member is further provided with at least two through slots penetrating the second wall panel along the third direction. The at least two through slots are spaced apart along the first direction to form a first connecting portion between two adjacent through slots. One end of the first connecting portion is connected to the first wall panel, and the other end is a free end. The first hook portion is connected to the free end.

[0014] According to some embodiments of the present invention, the limiting groove includes two sidewalls opposite each other along a third direction. Each sidewall includes a limiting surface and a guiding surface. The limiting surface is connected to the first wall plate, and the guiding surface is connected to the end of the limiting surface away from the first wall plate. The distance between the two guiding surfaces increases along the direction of the limiting surface away from the first wall plate.

[0015] According to some embodiments of the present utility model, the transformer body includes a coil, the housing includes a main body and a connecting arm connected to the main body, the coil is disposed inside the main body, the connecting arm extends along the second direction, and the connecting arm is provided with a first positioning groove communicating with the interior of the main body;

[0016] The current transformer further includes a current sampling needle assembly, which includes a current sampling needle and a connector that covers part of the current sampling needle. The connector is inserted into the first positioning groove, and one end of the current sampling needle is connected to the coil.

[0017] According to some embodiments of the present invention, the connecting arm is provided with a limiting hole, the limiting hole is connected to the first positioning groove, and the outer surface of the connecting member is provided with a limiting protrusion, the limiting protrusion being inserted into the limiting hole.

[0018] According to some embodiments of this utility model, the current sampling needle includes a third needle body and a fourth needle body, and the connecting member includes:

[0019] A first connector extends along the second direction, a portion of the first connector is inserted into the first positioning groove, the first connector is provided with a first slot extending along the second direction, and the third needle body passes through the first slot.

[0020] The second connector extends along the first direction and is connected to the end of the first connector away from the main body. The second connector has a second slot extending along the first direction and communicating with the first slot. The fourth needle body passes through the second slot, with one end connected to the third needle body and the other end extending out of the second slot.

[0021] According to some embodiments of the present invention, the first connector includes a first surface and a second surface that are opposite to each other along the first direction. The first surface is provided with a plug-in portion, and the second connector is provided with a second positioning groove. The plug-in portion is plugged into the second positioning groove.

[0022] The second connector is provided with a second buckle, which includes a second connecting part and a second hook part. The second connecting part extends along the first direction to protrude from the second surface, and the second hook part is connected to one end of the second connecting part that protrudes from the second surface, and the second hook part is engaged with the second surface.

[0023] The electricity meter according to the second aspect of the present invention includes the current transformer described in any of the above embodiments.

[0024] The electricity meter according to the embodiments of this utility model has at least the following beneficial effects:

[0025] By employing the current transformer of the first aspect embodiment, the current transformer incorporates a limiting member comprising a first wall plate and a first buckle connected to the first wall plate. The first wall plate and a portion of the voltage sampling needle extend along a first direction. The first buckle includes a first hook portion, and the first hook portion and the first wall plate are spaced apart along a second direction. This limits the voltage sampling needle to be positioned between the first wall plate and the first hook portion, thereby limiting the voltage sampling needle along the second direction. This reduces the risk of bending and deformation of the voltage sampling needle during production and transportation, and facilitates smooth insertion of the voltage sampling needle when assembling the current transformer with other electronic components, improving assembly efficiency. In this invention, the limiting member and the outer shell are integrally injection molded. Furthermore, by providing a through hole penetrating the first wall plate along the second direction, with the through hole opposite to the first hook portion, after the limiting member and the outer shell are injection molded, a portion of the mold structure used to form the first hook portion can exit through the through hole, facilitating demolding. This eliminates the need for a complex demolding mechanism for the first hook portion, simplifying mold design and reducing production costs.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0028] Figure 1 This is a first-view structural schematic diagram of the current transformer according to an embodiment of the present utility model;

[0029] Figure 2 This is a second-view structural schematic diagram of the current transformer according to an embodiment of the present invention;

[0030] Figure 3 for Figure 2 The structure shown is a cross-sectional view along section AA;

[0031] Figure 4This is a third-view structural schematic diagram of the current transformer according to an embodiment of the present invention;

[0032] Figure 5 for Figure 3 The structure shown is a cross-sectional view along section CC.

[0033] Figure 6 This is a schematic diagram of the structure of the outer shell and the limiting member in an embodiment of this utility model;

[0034] Figure 7 This is a schematic diagram of the current sampling needle assembly according to an embodiment of the present invention;

[0035] Figure 8 for Figure 2 The structure shown is a cross-sectional view along section BB;

[0036] Figure 9 This is a schematic diagram of the structure of the first connecting member according to an embodiment of the present utility model;

[0037] Figure 10 This is a schematic diagram of the structure of the second connector in an embodiment of the present utility model.

[0038] Icon labels:

[0039] Current transformer 10;

[0040] Current transformer body 100; first side 101; second side 102; outer shell 110; main body 111; connecting arm 112; first positioning groove 1121; limiting hole 1122; conductive sheet 120;

[0041] Limiting component 200; limiting groove 201; first wall plate 210; through hole 211; second wall plate 220; through groove 221; first buckle 222; first connecting part 2221; first hook part 2222; guide surface 223; limiting surface 224;

[0042] Voltage sampling needle 300; First needle body 310; Second needle body 320;

[0043] Current sampling needle 400; third needle body 410; fourth needle body 420;

[0044] Connector 500; First connector 510; First surface 510a; Second surface 510b; Limiting protrusion 511; Insertion part 512; First slot 513;

[0045] Second connector 520; second positioning groove 521; second buckle 522; second connecting part 5221; second hook part 5222; second slot 523. Detailed Implementation

[0046] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0047] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0048] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0049] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0050] This application provides a current transformer.

[0051] Please refer to Figure 1 , Figure 1 This is a first-view structural schematic diagram of the current transformer according to an embodiment of the present invention. The current transformer 10 includes a transformer body 100, a voltage sampling needle 300, and a limiting member 200.

[0052] The transformer body 100 includes a housing 110 and a conductive sheet 120 passing through the housing 110. One end of the voltage sampling needle 300 is connected to the conductive sheet 120, and a portion of the voltage sampling needle 300 extends along a first direction.

[0053] Please combine Figure 1 And refer to Figure 2 and Figure 3 , Figure 2 This is a second-view structural schematic diagram of the current transformer according to an embodiment of the present invention. Figure 3 for Figure 2The structure shown is a cross-sectional view along section AA. The limiting member 200 includes a first wall plate 210 and a first buckle 222 connected to the first wall plate 210. The first wall plate 210 extends in a first direction, and the first buckle 222 includes a first hook portion 2222. The first hook portion 2222 is disposed opposite to the first wall plate 210 in a second direction, and the voltage sampling needle 300 is limited between the first hook portion 2222 and the first wall plate 210.

[0054] For ease of explanation, the first direction is defined as the X-axis direction of the three-dimensional coordinate system, and the second direction is defined as the Y-axis direction. By confining the voltage sampling needle 300 between the first hook portion 2222 and the first wall plate 210, the first hook portion 2222 and the first wall plate 210 jointly restrict the degree of freedom of movement of the voltage sampling needle 300 along the Y-axis direction, preventing the voltage sampling needle 300 from moving along the Y-axis direction. This reduces the risk of bending and deformation of the voltage sampling needle 300 during production and transportation. Consequently, when assembling the current transformer 10 with other electronic components (e.g., DIP assembly), it is easier to ensure the consistency between the voltage sampling needle 300 and the pin hole position, facilitating smooth insertion of the voltage sampling needle 300 and improving assembly efficiency.

[0055] Understandably, both the limiting member 200 and the outer shell 110 are plastic parts to insulate them from the voltage sampling needle 300. For ease of production, in this embodiment, the limiting member 200 and the outer shell 110 are integrally injection molded. Therefore, the first buckle 222 is formed by injection molding. Since the first buckle 222 is hook-shaped and relatively complex, for easy demolding, refer to... Figure 3 As shown, the limiting member 200 is also provided with a through hole 211 that penetrates the first wall panel 210 along the second direction, and the first hook portion 2222 is disposed opposite to the through hole 211.

[0056] Specifically, to form the shape of the first hook portion 2222, a portion of the mold structure must be located between the first hook portion 2222 and the first wall plate 210. By providing a through hole 211 in the first wall plate 210 and setting the through hole 211 opposite to the first hook portion 2222, the through hole 211 can be used as a demolding hole for the mold structure. After the first wall plate 210 and the first hook portion 2222 are formed, the portion of the mold structure facing the first wall plate 210 of the first hook portion 2222 can exit from the through hole 211 in the second direction, thereby successfully demolding.

[0057] In this embodiment of the utility model, a through hole 211 is provided in the first wall plate 210, which is opposite to the first hook part 2222. After the limiting member 200 is injection molded, part of the mold structure used to form the first hook part 2222 can be withdrawn from the through hole 211, which is conducive to demolding. Therefore, there is no need to design a complex demolding mechanism, which can simplify mold design and reduce production costs.

[0058] It should be noted that, in addition to facilitating demolding, the through hole 211 can also be used in some cases to allow a detection probe to pass through the through hole 211 and contact the voltage sampling needle 300 for detection.

[0059] Please refer to Figure 4 , Figure 4 This is a third-view structural diagram of the current transformer according to an embodiment of the present invention. The housing 110 is provided with a connecting arm 112. Along the first direction, the side of the connecting arm 112 facing the conductive sheet 120 is the first side 101, and the side of the connecting arm 112 away from the conductive sheet 120 is the second side 102. The voltage sampling needle 300 includes a first needle body 310 and a second needle body 320. The first needle body 310 is located on the first side 101 and connected to the conductive sheet 120. One end of the second needle body 320 is connected to the first needle body 310, and the other end extends along the first direction to the second side 102 so that the second needle body 320 can be connected to other electronic components.

[0060] In one embodiment, the first wall panel 210 is connected to the connecting arm 112, with at least a portion of the first wall panel 210 located on the second side 102. A first latch 222 is connected to the portion of the first wall panel 210 located on the second side 102. By positioning the first latch 222 on the portion of the first wall panel 210 located on the second side 102, the first latch 222 is closer to the end of the second needle body 320, thus better constraining and limiting the second needle body 320, preventing deformation of the second needle body 320, and ensuring smooth insertion during DIP insertion.

[0061] To further prevent deformation of the voltage sampling needle 300, in one embodiment, please combine with Figure 4 And refer to Figure 5 , Figure 5 for Figure 3 The cross-sectional view of the structure shown along section CC indicates that the limiting member 200 also includes two second wall plates 220. Both second wall plates 220 extend along a first direction and are respectively connected to the first wall plate 210. The two second wall plates 220 are arranged opposite each other along a third direction, which is perpendicular to both the first and second directions. The third direction is the Z-axis direction of the aforementioned three-dimensional coordinate system. The first wall plate 210 and the two second wall plates 220 enclose a limiting groove 201, through which the voltage sampling needle 300 passes. The width of the limiting groove 201 is slightly larger than the thickness of the voltage sampling needle 300 along the third direction, so that the voltage sampling needle 300 can smoothly enter the limiting groove 201.

[0062] The voltage sampling needle 300 passes through the limiting groove 201, that is, the voltage sampling needle 300 is located between the two second wall plates 220. The two second wall plates 220 restrict the degree of freedom of movement of the voltage sampling needle 300 along the Z-axis, thereby further limiting the voltage sampling needle 300. In this way, the entire limiting component 200, through the limiting cooperation of the first wall plate 210 and the first hook portion 2222, and through the limiting cooperation of the two second wall plates 220, jointly restricts the movement of the voltage sampling needle 300 along the Y-axis and Z-axis, greatly enhancing the limiting of the voltage sampling needle 300. This can effectively prevent the voltage sampling needle 300 from deforming during production and transportation, ensure the smoothness of the voltage sampling needle 300 when it is inserted, and improve the assembly efficiency of the current transformer 10.

[0063] At least one second wall panel 220 is provided with the aforementioned first latch 222. For example, in some embodiments, either of the two second wall panels 220 is provided with the first latch 222. Alternatively, in other embodiments, both second wall panels 220 may be provided with the first latch 222, and the first latches 222 on the two second wall panels 220 may be offset along a first direction. It is understood that the accompanying drawings of this application are only illustrative of the first embodiment described above and should not be construed as limiting this application.

[0064] Specifically, during the assembly of the current transformer 10, to improve assembly efficiency, the voltage sampling needle 300 and the conductive sheet 120 are first connected as a whole. Then, the conductive sheet 120 is passed through the center of the transformer body 100. After the conductive sheet 120 is assembled in place, the voltage sampling needle 300 is confined within the limiting groove 201. During this process, because the first hook portion 2222 is located at the opening of the limiting groove 201, the voltage sampling needle 300 must overcome the obstruction of the first hook portion 2222 to enter the limiting groove 201.

[0065] To facilitate the entry of the voltage sampling needle 300 into the limiting groove 201, in one embodiment, reference is made to... Figure 4 As shown, the limiting member 200 also has at least two through slots 221 extending through the second wall panel 220 in a third direction. The through slots 221 communicate with the limiting slot 201. The at least two through slots 221 are spaced apart in a first direction to form a first connecting portion 2221 between two adjacent through slots 221. One end of the first connecting portion 2221 is connected to the first wall panel 210, and the other end is a free end. A first hook portion 2222 is connected to the free end. The first connecting portion 2221 and the first hook portion 2222 form a first buckle 222.

[0066] Understandably, since the first connecting part 2221 is connected to the first wall plate 210 at only one end and the other end is a free end, and the two sides of the first connecting part 2221 along the first direction are through grooves 221, it is not restrained by the second wall plate 220. This reduces the rigidity of the first connecting part 2221, giving it better elasticity. The first connecting part 2221 can bend and deform under a small external force. Therefore, during the assembly of the current transformer 10, the voltage sampling needle 300 can easily overcome the obstruction of the first hook part 2222 and smoothly enter the limiting groove 201, which is beneficial to the assembly of the ionization transformer and can improve the assembly efficiency.

[0067] Because one end of the voltage sampling needle 300 is fixed to the conductive sheet 120, while the other end is free, and because the voltage sampling needle 300 is relatively long, the end of the voltage sampling needle 300 furthest from the conductive sheet 120 is prone to wobbling during assembly, making it difficult for the voltage sampling needle 300 to align with the limiting groove 201. To address this, in some embodiments, refer to... Figure 5 As shown, the limiting groove 201 includes two side walls opposite each other along a third direction. Each side wall includes a limiting surface 224 and a guiding surface 223. The limiting surface 224 is connected to the first wall plate 210, and the guiding surface 223 is connected to the end of the limiting surface 224 away from the first wall plate 210. The distance between the two guiding surfaces 223 increases along the direction of the limiting surface 224 away from the first wall plate 210.

[0068] like Figure 5 As shown, the distance between the ends of the two guide surfaces 223 that are close to the limiting surface 224 is small, and the distance between the ends of the two guide surfaces 223 that are far away from the limiting surface 224 is large. This makes the opening of the limiting groove 201 form a flared opening, which reduces the difficulty of aligning the voltage sampling needle 300. At the same time, the guide surfaces 223 can guide the voltage sampling needle 300 to slide on their surface and enter the limiting groove 201, which is conducive to the entry of the voltage sampling needle 300, reduces the assembly difficulty of the voltage sampling needle 300, and effectively reduces the risk of deformation of the voltage sampling needle 300 when connected to the housing 110.

[0069] The guide surface 223 can be designed as a slope or a curved surface. The accompanying drawings of this application embodiment are only illustrated by the former.

[0070] In one embodiment, such as Figure 3As shown, the width of the through hole 211 along the third direction is greater than the thickness of the voltage sampling needle 300 along the third direction, that is, the width of the through hole 211 along the Z-axis is greater than the width of the voltage sampling needle 300 along the Z-axis. Therefore, the thickness of the mold structure exiting from the through hole 211 can be set larger, giving it sufficient strength, which is beneficial for mass production. Furthermore, when testing is required, the testing probe can easily pass through the through hole 211 and extend to the side of the voltage sampling needle 300, ensuring full contact between the probe and the voltage sampling needle 300, which is beneficial for the testing operation.

[0071] The transformer body 100 also includes a coil (not shown in the figure). Please refer to... Figure 1 And refer to Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of the outer shell and the limiting member in an embodiment of this utility model. Figure 7 This is a schematic diagram of the current sampling needle assembly according to an embodiment of the present invention. The outer shell 110 includes a main body 111 and a connecting arm 112 connected to the main body 111. The main body 111 is cylindrical, and the coil is disposed inside the main body 111. The connecting arm 112 extends along a second direction and is provided with a first positioning groove 1121 communicating with the interior of the main body 111. The current transformer 10 also includes a current sampling needle assembly, which includes a current sampling needle 400 and a connector 500 covering part of the current sampling needle 400. The connector 500 is inserted into the first positioning groove 1121, such that one end of the current sampling needle 400 extends into the interior of the main body 111 and connects to the coil.

[0072] Understandably, by using connector 500 to cover the current sampling needle 400, the current sampling needle 400 is constrained and limited by connector 500, which can effectively prevent the current sampling needle 400 from deforming during production and transportation.

[0073] In the assembly process of the current transformer 10, the current sampling needle 400 and the connector 500 are first assembled into a whole to form a current sampling needle assembly. Then, the current sampling needle assembly is connected to the transformer body 100. Thus, the transformer body 100 and the current sampling needle assembly can be assembled separately on independent assembly lines before being finalized, allowing multiple assembly lines to run in parallel. Compared to assembling the current sampling needle 400, connector 500, and transformer body 100 one by one, this improves assembly efficiency and production efficiency.

[0074] In one embodiment, please refer to Figure 6 And refer to Figure 8 and Figure 9 , Figure 8 for Figure 2 The structure shown is a cross-sectional view along section BB. Figure 9This is a schematic diagram of the structure of the first connector according to an embodiment of the present invention. The connecting arm 112 is also provided with a limiting hole 1122, which communicates with the first positioning groove 1121. A limiting protrusion 511 is provided on the outer surface of the connector 500, and the limiting protrusion 511 is inserted into the limiting hole 1122. Through the cooperation between the limiting protrusion 511 and the limiting hole 1122, the connector 500 is assembled and limited, and the movement of the connector 500 in the second direction is restricted, ensuring that the current sampling needle assembly is securely connected to the connecting arm 112 and preventing the connector 500 from sliding out and falling off from the first positioning groove 1121.

[0075] Please combine Figure 8 , Figure 9 And refer to Figure 10 , Figure 10 This is a schematic diagram of the structure of the second connector in an embodiment of the present invention. The current sampling needle 400 includes a third needle body 410 and a fourth needle body 420. The connector 500 includes a first connector 510 and a second connector 520. The first connector 510 extends along a second direction, and a portion of the first connector 510 is inserted into a first positioning groove 1121. The first connector 510 is provided with a first slot 513 extending along the second direction. The third needle body 410 passes through the first slot 513, and one end extends into the main body 111 to connect with the coil.

[0076] The second connector 520 extends along the first direction and is connected to the end of the first connector 510 away from the main body 111. The second connector 520 is provided with a second slot 523 extending along the first direction. The second slot 523 communicates with the first slot 513. The fourth needle body 420 passes through the second slot 523. One end of the fourth needle body 420 is connected to the third needle body 410, and the other end extends out of the second slot 523.

[0077] The first connector 510 includes a first surface 510a and a second surface 510b that are opposite to each other along a first direction. The first surface 510a has a protruding insertion portion 512. The second connector 520 has a second positioning groove 521. The insertion portion 512 is inserted into the second positioning groove 521, and the shape of the insertion portion 512 is adapted to the shape of the second positioning groove 521. The second connector 520 has a second buckle 522, which includes a second connecting portion 5221 and a second hook portion 5222. The second connecting portion 5221 extends along the first direction to protrude from the second surface 510b. The second hook portion 5222 is connected to one end of the first connecting portion 5221 that protrudes from the first surface 510a, and the second hook portion 5222 is engaged with the second surface 510b.

[0078] In this embodiment, the first connector 510 and the second connector 520 are connected using the above-described structure. Compared to the adhesive bonding process used in related technologies, the insertion of the first connector 510 and the second connector 520 is quick and convenient, simplifying the assembly process and improving production efficiency. Furthermore, the first connector 510 is reliably positioned against the second connector 520 via the second snap-fit ​​522, ensuring a strong connection between them and eliminating the risk of separation or detachment due to adhesive aging.

[0079] This application also provides an electricity meter, which includes a current transformer 10 based on any of the above embodiments. Because the electricity meter employs all the technical solutions of the current transformer 10 of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0080] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A current transformer, characterized in that, include: The transformer body includes a housing and a conductive sheet passing through the housing; A voltage sampling needle is connected to the conductive sheet, and a portion of the voltage sampling needle extends along a first direction; A limiting component is integrally injection molded with the outer shell. The limiting component includes a first wall plate and a first buckle. The first wall plate extends along a first direction, and the first buckle is connected to the first wall plate. The first buckle includes a first hook portion, which is spaced apart from the first wall plate along a second direction. The second direction is perpendicular to the first direction. A portion of the voltage sampling needle is located between the first wall plate and the first hook portion. The limiting component has a through hole that penetrates the first wall plate along the second direction, and the first hook portion is disposed opposite to the through hole.

2. The current transformer according to claim 1, characterized in that, The outer casing is provided with a connecting arm. Along the first direction, the side of the connecting arm facing the conductive sheet is the first side, and the side of the connecting arm away from the conductive sheet is the second side. The voltage sampling needle includes a first needle body and a second needle body connected to each other. The first needle body is located on the first side and connected to the conductive sheet. One end of the second needle body is connected to the first needle body, and the other end extends along the first direction to the second side. The first wall panel is connected to the connecting arm, and the first buckle is connected to the portion of the first wall panel located on the second side.

3. The current transformer according to claim 1, characterized in that, The limiting member further includes two second wall plates, both of which extend along the first direction and are respectively connected to the first wall plate. The two second wall plates are arranged opposite each other along a third direction, which is perpendicular to the first direction and the second direction. The first wall plate and the two second wall plates enclose each other to form a limiting groove, and the voltage sampling needle passes through the limiting groove. At least one of the second wall plates is provided with the first buckle.

4. The current transformer according to claim 3, characterized in that, The limiting member is further provided with at least two through slots that penetrate the second wall panel along the third direction. The at least two through slots are spaced apart along the first direction to form a first connecting part between two adjacent through slots. One end of the first connecting part is connected to the first wall panel, and the other end is a free end. The first hook part is connected to the free end.

5. The current transformer according to claim 3, characterized in that, The limiting groove includes two sidewalls opposite each other along the third direction. Each sidewall includes a limiting surface and a guiding surface. The limiting surface is connected to the first wall panel, and the guiding surface is connected to the end of the limiting surface away from the first wall panel. The distance between the two guiding surfaces increases in the direction away from the first wall panel.

6. The current transformer according to any one of claims 1 to 5, characterized in that, The transformer body includes a coil, the housing includes a main body and a connecting arm connected to the main body, the coil is disposed inside the main body, the connecting arm extends along the second direction, and the connecting arm is provided with a first positioning groove communicating with the interior of the main body; The current transformer further includes a current sampling needle assembly, which includes a current sampling needle and a connector that covers part of the current sampling needle. The connector is inserted into the first positioning groove, and one end of the current sampling needle is connected to the coil.

7. The current transformer according to claim 6, characterized in that, The connecting arm is provided with a limiting hole, which communicates with the first positioning groove. The outer surface of the connecting member is provided with a limiting protrusion, which is inserted into the limiting hole.

8. The current transformer according to claim 6, characterized in that, The current sampling needle includes a third needle body and a fourth needle body, and the connector includes: A first connector extends along the second direction, a portion of the first connector is inserted into the first positioning groove, the first connector is provided with a first slot extending along the second direction, and the third needle body passes through the first slot. The second connector extends along the first direction and is connected to the end of the first connector away from the main body. The second connector has a second slot extending along the first direction and communicating with the first slot. The fourth needle body passes through the second slot, with one end connected to the third needle body and the other end extending out of the second slot.

9. The current transformer according to claim 8, characterized in that, The first connector includes a first surface and a second surface that are opposite to each other along the first direction. The first surface is provided with a protruding insertion portion, and the second connector is provided with a second positioning groove. The insertion portion is inserted into the second positioning groove. The second connector is provided with a second buckle, which includes a second connecting part and a second hook part. The second connecting part extends along the first direction to protrude from the second surface, and the second hook part is connected to one end of the second connecting part that protrudes from the second surface, and the second hook part is engaged with the second surface.

10. An electricity meter, characterized in that, Includes the current transformer as described in any one of claims 1 to 9.

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