Current sensor

Abstract

This utility model belongs to the field of current sensor technology, and particularly relates to a current sensor, including a hollow front shell, a current transformer, a circuit board, and a rear cover. The inner cavity of the hollow front shell is provided with a sleeve that extends through both ends. The circuit board has a clearance hole corresponding to the sleeve. The outer side of the sleeve is provided with several first support ribs, and the first plane is provided with a first extrusion post protruding along the axial direction of the sleeve. During installation, the first plane of the first support ribs provides axial support force to the circuit board, and the interference fit between the first extrusion post and the inner wall of the clearance hole provides a fixed support force and friction force to the circuit board in the axial direction of the sleeve, reducing the loosening of the circuit board caused by the relative movement of the sleeve and the clearance hole, and facilitating subsequent pin soldering.

Description

Technical Field

[0001] This utility model belongs to the field of current sensor technology, and particularly relates to current sensors. Background Technology

[0002] A current sensor is a device used to detect the magnitude of current in a circuit. It can convert the current signal in the circuit into an analog or digital output. In the prior art, the sensor housing structure has a sleeve for mounting the current transformer, and the circuit board is directly fitted onto the sleeve through a clearance hole. However, this structure has the following drawback: the clearance hole can move in the axial direction of the sleeve, which can easily lead to the circuit board becoming loose. Utility Model Content

[0003] The purpose of this invention is to provide a current sensor, which aims to solve the technical problems in the prior art.

[0004] To achieve the above objectives, the current sensor provided in this embodiment includes a hollow front shell, a current transformer, a circuit board, and a rear cover. The inner cavity of the hollow front shell is provided with a sleeve that extends through both ends. The circuit board has a clearance hole corresponding to the sleeve. The outer side of the sleeve is provided with a plurality of first support ribs. The inner end of the first support ribs extends to the inner cavity end wall of the hollow front shell, and the outer end extends towards the end near the rear cover, with its end forming a first plane. The first plane is provided with a first extrusion post protruding along the axial direction of the sleeve. The plurality of first planes act on the front side of the circuit board and can continuously provide support force. The plurality of first extrusion posts act on the inner side of the clearance hole and can continuously provide friction force along the axial direction of the sleeve. The current transformer is coaxially sleeved on the sleeve and located in the inner cavity of the hollow front shell. The rear cover is detachably fixed to the rear end of the hollow front shell and can cover the inner cavity of the hollow front shell.

[0005] Optionally, the first extrusion column is a triangular column with two edges connected to the outer side of the sleeve, and the remaining edge acting as an extrusion force on the inner side of the perforation hole.

[0006] Optionally, the first extrusion post has a first inlet surface arranged at an angle at one end near the rear cover.

[0007] Optionally, there are six first support ribs, which are arranged in a circumferential array around the outside of the sleeve.

[0008] Optionally, it further includes a plurality of second support ribs, which are disposed on the inner cavity sidewall of the hollow front shell. The inner end of the second support rib extends to the inner cavity endwall of the hollow front shell, and the outer end extends towards the end near the rear cover. Its end is formed into a second plane with the same height as the first plane. A second extrusion post with the same length as the first extrusion post is protruding on the second plane. The plurality of second planes can support the front side of the circuit board, and the plurality of second extrusion posts can extrude the side of the circuit board.

[0009] Optionally, the shape of the second extrusion column is the same as the shape of the first extrusion column.

[0010] Optionally, it also includes a plurality of guide ribs, which are disposed on the inner cavity sidewall of the hollow front shell, and the side of the circuit board is provided with guide notches corresponding to the guide ribs.

[0011] Optionally, it also includes four pins. The front side of the hollow front shell is provided with a terminal socket. The pins are fixed to the hollow front shell by in-mold injection molding, with one end extending into the inner cavity of the hollow front shell and interlocking with the circuit board, and the other end extending into one end of the terminal socket.

[0012] Optionally, it also includes a pair of mounting ears, which are disposed opposite each other on both sides of the hollow front shell.

[0013] Optionally, the edge of the hollow front shell is provided with a buckle, and the edge of the rear cover is provided with a locking position that cooperates with the buckle.

[0014] The current sensor provided in this utility model embodiment has at least one of the following technical effects: during installation, the first plane of the first supporting rib provides axial support force to the circuit board and the interference fit between the first extrusion column and the inner wall of the clearance hole provides a fixed support force and friction force to the circuit board in the axial direction of the sleeve, reducing the loosening of the circuit board caused by the relative movement of the sleeve and the clearance hole, and facilitating subsequent pin soldering. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art 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.

[0016] Figure 1 This is a schematic diagram of the structure of a current sensor provided in an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the hidden back cover of the current sensor provided in an embodiment of the present invention.

[0018] Figure 3 An exploded view of the components of the current sensor provided in an embodiment of this utility model.

[0019] The following are the labeling elements in the figure: 1—Hollow front shell; 11—Sleeve; 12—First support rib 121—First plane; 122—First compression column; 13—Second support rib. 131—Second plane; 132—Second extrusion column; 14—Guide rib. 15—Terminal socket 16—Mounting ear plate 17—Snap-on 2—Current transformer; 3—Circuit board; 31—Perforation hole 32—Guide notch 4—Back cover 41—Card slot 5—PIN pin. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below, examples of which 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 intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of 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.

[0022] 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 as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0024] In one embodiment of this utility model, such as Figures 1-3 As shown, a current sensor is provided, including a hollow front shell 1, a current transformer 2, a circuit board 3, and a rear cover 4. The hollow front shell 1 has a sleeve 11 extending through both ends in its inner cavity. The circuit board 3 has a clearance hole 31 corresponding to the sleeve 11. The outer side of the sleeve 11 is provided with a plurality of first support ribs. The inner end of the first support rib 12 extends to the inner cavity end wall of the hollow front shell 1, and the outer end extends towards the end near the rear cover 4, with its end forming a first plane 121. The first plane 121 extends along the... The sleeve 11 has a first pressing post 122 protruding axially. Several first planes 121 act on the front side of the circuit board 3, providing continuous support force. Several first pressing posts 122 act on the inner side of the clearance hole 31, providing continuous friction force in the axial direction of the sleeve 11. The current transformer 2 is coaxially sleeved on the sleeve 11 and located in the inner cavity of the hollow front shell 1. The rear cover 4 is detachably fixed to the rear end of the hollow front shell 1, sealing the inner cavity of the hollow front shell 1. During installation, the first plane 121 of the first supporting rib 12 provides axial support force to the circuit board 3, and the interference fit between the first pressing post 122 and the inner wall of the clearance hole provides a fixed support force and friction force to the circuit board 3 in the axial direction of the sleeve 11, reducing the loosening of the circuit board 3 due to relative movement between the sleeve 11 and the clearance hole 31, and facilitating subsequent soldering of the PIN pins 5.

[0025] In one embodiment of this utility model, such as Figures 2-3 As shown, the first extrusion column 122 is a triangular prism, with two of its edges connected to the outer side of the sleeve 11, and the remaining edge acting as an extrusion force on the inner side of the clearance hole 31. Specifically, the first extrusion column 122 is integrally injection molded with the hollow front shell 1, and the extrusion is performed using a single edge at each interference fit, which helps to reduce the difficulty of installing the circuit board 3.

[0026] In one embodiment of this utility model, such as Figures 2-3As shown, the first extrusion post 122 has a first guide surface arranged at an angle at one end near the rear cover. The angled first guide surface provides guidance for the insertion of the circuit board 3, further reducing the difficulty of assembly.

[0027] In one embodiment of this utility model, such as Figures 2-3 As shown, there are six first support ribs 12, which are arranged in a circumferential array around the outside of the sleeve 11. The simultaneous action of these six ribs on the circuit board 3 increases the contact area with the clearance hole 31, thus improving installation stability.

[0028] In one embodiment of this utility model, such as Figures 2-3 As shown, it also includes a plurality of second support ribs 13, which are disposed on the inner cavity sidewall of the hollow front shell 1. The inner end of the second support rib 13 extends to the inner cavity endwall of the hollow front shell 1, and the outer end extends towards the end near the rear cover 4, with its end forming a second plane 131 at the same height as the first plane 121. A second extrusion post 132 of the same length as the first extrusion post 122 protrudes from the second plane 131. The plurality of second planes 131 can support the front side of the circuit board 3, and the plurality of second extrusion posts 132 can extrude on the side of the circuit board 3. Specifically, by using the second support ribs 13 to act on the outside of the circuit board 3, the injection molding of screw posts, screw costs, and screw tightening steps can be eliminated, which is beneficial to improving the installation efficiency of the circuit board 3.

[0029] In one embodiment of this utility model, such as Figures 2-3 As shown, the shape of the second extrusion post 132 is the same as that of the first extrusion post 122. The structure and function of the second extrusion post 132 are the same as those of the first extrusion post 122. The difference is that the second extrusion post 132 acts on the outer edge of the circuit board 3. In this embodiment, the second extrusion post 132 is provided in four places, with two places as a group, and the two groups are arranged opposite each other on the inner side wall of the hollow front shell 1.

[0030] In one embodiment of this utility model, such as Figures 2-3 As shown, it also includes several guide ribs 14, which are disposed on the inner cavity sidewall of the hollow front shell 1. The side of the circuit board 3 has guide notches 32 corresponding to the guide ribs 14. Specifically, the depth of the guide ribs 14 is higher than that of the first extrusion post 122 and the second extrusion post 132. Before the circuit board 3 interferes with the extrusion post, the guide notches 32 slide with the guide post to achieve precise alignment at the interference point, ensuring that the extrusion posts can act on the circuit board 3.

[0031] In one embodiment of this utility model, such as Figures 2-3As shown, it also includes four pins 5. The front side of the hollow front shell 1 has a protruding terminal socket 15. The pins 5 are fixed to the hollow front shell 1 by in-mold injection molding, with one end extending into the inner cavity of the hollow front shell 1 and interlocking with the circuit board 3, and the other end extending into one end of the terminal socket 15. The circuit board 3, the current transformer 2, and the pins 5 are all general standard parts. Their electrical connection relationships, models, and principles are technical means that can be learned by those skilled in the art through technical manuals or conventional experimental methods, so this embodiment will not elaborate further. It also includes a pair of mounting ears 16, which are arranged opposite to each other on both sides of the hollow front shell 1. The edge of the hollow front shell 1 is provided with a buckle 17, and the edge of the rear cover 4 is provided with a locking position 41 that cooperates with the buckle 17.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A current sensor characterized by: The device includes a hollow front shell, a current transformer, a circuit board, and a rear cover. The hollow front shell has a sleeve extending through both ends in its inner cavity. The circuit board has a clearance hole corresponding to the sleeve. The outer side of the sleeve is provided with a plurality of first support ribs. The inner end of the first support ribs extends to the inner wall of the hollow front shell, and the outer end extends towards the rear cover, with its end forming a first plane. The first plane has a first extrusion post protruding along the axial direction of the sleeve. The plurality of first planes act on the front side of the circuit board and can continuously provide support force. The plurality of first extrusion posts act on the inner side of the clearance hole and can continuously provide friction force along the axial direction of the sleeve. The current transformer is coaxially sleeved on the sleeve and located in the inner cavity of the hollow front shell. The rear cover is detachably fixed to the rear end of the hollow front shell and can cover the inner cavity of the hollow front shell.

2. The current sensor of claim 1, wherein: The first extrusion column is a triangular column with two edges connected to the outer side of the sleeve, and the remaining edge acts as an extrusion force on the inner side of the perforation hole.

3. The current sensor of claim 2, wherein: The first extrusion column has a first inlet surface arranged at an angle at one end near the rear cover.

4. The current sensor of claim 1, wherein: There are six first support ribs, which are arranged in a circumferential array around the outside of the sleeve.

5. The current sensor of claim 1, wherein: It also includes a plurality of second support ribs, which are disposed on the inner cavity sidewall of the hollow front shell. The inner end of the second support rib extends to the inner cavity endwall of the hollow front shell, and the outer end extends towards the end near the rear cover. Its end is formed into a second plane with the same height as the first plane. A second extrusion post with the same length as the first extrusion post is protruding on the second plane. The plurality of second planes can support the front side of the circuit board, and the plurality of second extrusion posts can extrude the side of the circuit board.

6. The current sensor of claim 5, wherein: The shape of the second extrusion column is the same as that of the first extrusion column.

7. The current sensor of claim 1, wherein: It also includes several guide ribs, which are disposed on the inner cavity sidewall of the hollow front shell, and the side of the circuit board is provided with guide notches corresponding to the guide ribs.

8. The current sensor of claim 1, wherein: It also includes four pins. The front side of the hollow front shell is provided with a terminal socket. The pins are fixed to the hollow front shell by in-mold injection molding, with one end extending into the inner cavity of the hollow front shell and interlocking with the circuit board, and the other end extending into one end of the terminal socket.

9. The current sensor of claim 1, wherein: It also includes a pair of mounting lugs, which are disposed opposite each other on both sides of the hollow front shell.

10. The current sensor of claim 1, wherein: The edge of the hollow front shell is provided with a buckle, and the edge of the rear cover is provided with a locking position that cooperates with the buckle.

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