A housing structure for a current sensor of a high-precision electricity meter

Abstract

A housing structure for a high-precision electric energy meter current sensor, comprising an upper cover and a base, characterized in that: the upper cover has a closed U-shaped cross-section, is provided with an interface hole, and is flanked by a right and left upper cover fixing hole; a first right clip and a second right clip are provided on the side of the upper cover; a debugging port is provided at the bottom of the upper cover, the debugging port being an open rectangular port, and a stepped portion of the upper cover is provided within the debugging port. The stepped portion has a concave-convex step shape and is integral with the debugging port; the inner wall of the wire hole in the upper cover is an outwardly convex arc shape and is located in the middle of the U-shaped upper cover. The base and upper cover of the present invention are connected by a concave-convex structure, preventing leakage of electronic sealant from the base through the joint with the upper cover when the base is filled. The implementation of multiple technical features of the present invention enables the present invention to achieve a strong shielding effect.

Description

[0001] The present invention belongs to the technical field of electric energy meters, and in particular relates to a shell structure for a current sensor of a high-precision electric energy meter. Background Art

[0002] DC current sensors are widely used in the field of DC current measurement due to their high measurement accuracy and reliability. However, since most current DC current sensors are square and large in size, they are significantly inconvenient when used in the compact design of DC energy meters. Furthermore, when measuring high currents, most sensors use busbars as the current carrier. This installation method significantly hinders sensor design and optimization. Furthermore, the large space occupied by the through-hole installation on the busbar directly affects the measurement of DC current sensors and DC energy meters. Therefore, it is essential to design a compact and precise sensor protection structure. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, the present invention proposes a housing structure for a high-precision current sensor in electric energy meters. This housing is a three-dimensional, enclosed U-shaped hollow shell structure with a central circular hole. This structure provides heat insulation when measuring large currents. The housing is lightweight, quick and easy to install, and provides excellent shielding.

[0004] The technical solution of the present invention is a housing structure for a high-precision electric energy meter current sensor, the housing structure comprising an upper cover and a base, the cross-section of the upper cover being a closed U-shape, the upper cover being provided with an interface hole, a right upper cover fixing hole and a left upper cover fixing hole being provided on either side of the interface hole, a right first snap button and a right second snap button being provided on the side of the upper cover, a debugging port being provided at the bottom of the upper cover, the debugging port being an open rectangular shape, a upper cover step fracture being provided inside the debugging port, the upper cover step fracture being a concave-convex step shape and being an integral structure with the debugging port, the inner wall of the upper cover wire hole being an outwardly convex arc shape and being located in the middle of the U-shaped upper cover;

[0005] The base comprises a U-shaped structure, a bottom base corner and a rectangular bottom, the U-shaped structure and the rectangular bottom are respectively connected by two bottom base corners to form an integrated structure, the base is provided with two bottom shell fixing holes, the inner wall of the bottom shell fixing hole is provided with a thread, and a support frame is provided inside the base, which is a long strip of cylinder, respectively located at the bottom and left and right sides of the base, wherein two of the support frames are respectively connected to the two bottom shell fixing holes, a snap protrusion right one and a snap protrusion right two are provided on the outer side surface of the base, and a bottom shell wire post is provided in the middle part of the bottom shell, which is hollow, and the outer diameter of the bottom shell wire post is equal to the inner diameter of the upper cover wire hole, and the two are in a nested relationship. When the bottom shell wire post is embedded in the upper cover wire hole, the contact mode of the outer wall of the bottom shell wire post and the inner surface of the upper cover wire hole belongs to the two arc-shaped circumferential mode, with a small contact surface;

[0006] The upper edge of the integrated structure composed of the rectangular bottom and the U-shaped structure is a lower step structure with a higher inner side and a lower outer side, and the lower edge of the upper cover is an upper step structure with a lower inner side and a higher outer side. The upper step structure and the lower step structure form a convex-concave structure connection.

[0007] Preferably, the interface hole is rectangular.

[0008] Preferably, the bottom corner of the base adopts an arc design.

[0009] Preferably, a current interface mark is provided on the upper portion of the interface hole.

[0010] Preferably, the first right buckle and the second right buckle have square holes arranged in parallel and respectively engage with the corresponding protrusions of the first right buckle protrusion and the second right buckle protrusion.

[0011] Preferably, an upper cover step fracture is provided inside the debugging port.

[0012] Preferably, the two upper cover fixing holes are arc-shaped, located on the left and right sides of the upper cover and have the same diameter.

[0013] Preferably, the inner wall of the bottom shell fixing hole has no threads.

[0014] Preferably, the inner wall of the bottom shell conductor post is in an outwardly convex arc shape.

[0015] Preferably, the inner walls of the upper cover wire hole and the corresponding bottom shell wire post are rectangular. When the bottom shell wire post is embedded in the upper cover wire hole, the upper cover and the bottom shell are embedded to form the outer shell structure. When the external cylindrical wire passes through the external structure, the contact mode between the outer surface of the wire and the inner surface of the inner wall of the bottom shell wire post is an arc-shaped and plane-tangent mode, with a smaller contact surface, thereby enhancing the electromagnetic shielding effect.

[0016] Preferably, the inner walls of the upper cover wire hole and the corresponding bottom shell wire column are square. When the external cylindrical wire passes through the external structure, the inner surface of the inner wall of the bottom shell wire column is a cross-sectional contact of the outer surface of the wire, which is an arc-shaped and plane-tangent contact, has a smaller contact surface, and enhances the electromagnetic shielding effect.

[0017] Preferably, the inner walls of the upper cover wire hole and the corresponding bottom shell wire column are triangular. When the external cylindrical wire passes through the external structure, the inner surface of the inner wall of the bottom shell wire column is a cross-section of the outer surface of the wire. The contact method is an arc-shaped and plane-tangent method, with a smaller contact area, which enhances the electromagnetic shielding effect.

[0018] Beneficial effects of the present invention:

[0019] 1) The base and the upper cover of the present invention are connected by a concave-convex structure, which prevents the base from leaking through the joint with the upper cover when electronic sealant is filled.

[0020] 2) The corners of the upper cover and bottom cover of this design are designed with arcs, which facilitates production, saves space and increases the sealing when the upper and lower covers are combined.

[0021] 3) When the bottom shell wire post is embedded in the upper cover wire hole, the upper cover and the bottom shell are embedded to form the outer shell structure. When the external cylindrical wire passes through the external structure, the outer surface of the wire and the inner surface of the inner wall of the bottom shell wire post have a smaller contact surface, thereby enhancing the electromagnetic shielding effect.

[0022] 4) The inner walls of the upper cover wire hole and the corresponding bottom shell wire post are square. When the external cylindrical wire passes through the external structure, the inner surface of the bottom shell wire post becomes the outer tangent of the wire's outer surface, providing a smaller contact surface and enhancing electromagnetic shielding.

[0023] 5) The inner walls of the upper cover wire hole and the corresponding bottom shell wire post are triangular. When the external cylindrical wire passes through the external structure, the inner surface of the bottom shell wire post becomes the outer tangent of the wire's outer surface, providing a smaller contact surface and enhancing electromagnetic shielding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the overall effect diagram of the present invention;

[0025] Figure 2 It is the overall structural diagram of the present invention;

[0026] Figure 3 is a cross-sectional view of the present invention;

[0027] Figure 4 A bottom view of the present invention;

[0028] Figure 5 Schematic diagram of the inner wall cross section of the bottom shell conductor post of the present invention;

[0029] Figure 6 It is a schematic cross-sectional view of the inner wall of the bottom shell conductor post of the present invention.

[0030] In the figure, 1. Upper cover; 2. Bottom shell; 3. Interface hole; 4. Wire hole of upper cover; 5. Wire post of bottom shell; 6. Right fixing hole of upper cover; 7. First right buckle; 8. Second right buckle; 9. Second right buckle protrusion; 10. First right buckle protrusion; 11. Right fixing hole of bottom shell; 12. Left fixing hole of upper cover; 13. Interface mark; 14. Debug port; 15. Step fracture of upper cover; 16. Support frame; 17. Bottom corner of base; 18. Left fixing hole of bottom shell. DETAILED DESCRIPTION

[0031] like Figures 1 to 6 As shown, the present invention includes an upper cover 1 and a bottom shell 2. The overall shape is a circle on the top and a square on the bottom, with a wire hole in the center; Figure 1 Except for the debugging port 14 and the interface hole 3, the entire shell is in a sealed state after assembly, and the upper cover 1 and the bottom shell 2 form a hollow shell structure. The cross-section of the upper cover 1 is U-shaped, and the upper cover is provided with an interface hole 3. The interface hole 3 is rectangular and is a position for leading out the power supply and output terminals reserved for the sensor. On both sides of the interface hole 3, there are provided a right upper cover fixing hole 6 and a left upper cover fixing hole 12. The right upper cover fixing hole 6 and the left upper cover fixing hole 12 are designed to be countersunk structures so that the screw head will not protrude when the screw is fixed. A current interface mark 13 is provided on the upper part of the interface hole 13, and a right buckle 7 and a right buckle 8 are provided on the side of the upper cover 1. A debugging port 14 is provided at the bottom of the upper cover, and the debugging port 14 is an open rectangular shape. A top cover step fracture 15 is provided inside the debugging port 14. The top cover step fracture 15 is a concave-convex step shape and is an integral structure with the debugging port. The inner wall of the upper cover wire hole 4 is an outwardly convex arc shape and is located in the middle of the U-shaped upper cover;

[0032] The base includes a U-shaped structure, a bottom base corner 17 and a rectangular bottom. The U-shaped structure and the rectangular bottom are respectively connected by two bottom base corners 17 to form an integrated structure. The base is provided with a right bottom shell fixing hole 11 and a left bottom shell fixing hole 18. The inner wall of the bottom shell fixing hole is provided with a thread, which together with the upper cover fixing hole 6 and the upper cover fixing hole 12 constitutes a structure for fixing the sensor housing to the outside world and runs through the entire bottom shell 2. The base 2 is provided with a support frame 16 inside, which is a long column, located at the bottom and left and right sides of the base 2, respectively. Figure 2The middle support frame 16 is used to support the sensor circuit board internally to prevent the circuit board from shifting. Two of the support frames 16 are respectively connected to the right bottom shell fixing hole 11 and the left base fixing hole 18. A snap protrusion 10 on the right and a snap protrusion 9 on the right are provided on the outer side surface of the base 2. The snap protrusion is a protrusion on the outer wall of the bottom shell, which is fastened with the Hui-shaped snap on the upper cover. A bottom shell wire column 5 is provided in the middle of the bottom shell 1. It is hollow. The outer diameter of the bottom shell wire column 5 is equal to the inner diameter of the upper cover wire hole 4. There is a nested relationship between the two. When the bottom shell wire column 5 is embedded in the upper cover wire hole 4, the outer wall of the bottom shell wire column 5 has a small contact surface with the inner surface of the upper cover wire hole 4. See Figure 5 The inner wall of the upper cover wire hole 4 and the corresponding bottom shell wire post 5 are square. When the external cylindrical wire passes through the external structure, the inner surface of the inner wall of the bottom shell wire post 5 is the cross section of the outer surface of the wire. The contact mode is an arc-shaped tangent to the plane, with a smaller contact surface, which enhances the electromagnetic shielding effect. Figure 6 The inner walls of the upper cover wire hole 4 and the corresponding bottom shell wire post 5 are triangular. When the external cylindrical wire passes through the external structure, the inner surface of the inner wall of the bottom shell wire post 5 forms a tangent to the outer surface of the wire. The contact method is a circular arc tangent to a plane, with a smaller contact surface, which enhances the electromagnetic shielding effect.

[0033] The present invention forms a closed structure between the upper cover and the bottom shell by linking the gap of the buckle and the raised part of the buckle protrusion, thereby effectively protecting the measuring instrument. The shell has a support frame structure that supports the measuring instrument and prevents the circuit board from shifting. At the same time, the structural design designs a bottom corner of the base in an arc shape, which increases the sealing when the upper and lower covers are combined. The outer diameter of the bottom shell wire post is equal to the inner diameter of the upper cover wire hole, and the two are in a nested relationship. When the bottom shell wire post is embedded in the upper cover wire hole, the outer wall of the bottom shell wire post and the inner surface of the upper cover wire hole have a smaller contact surface, thereby enhancing the electromagnetic shielding effect.

Claims

1. A housing structure for a high-precision electric energy meter current sensor, comprising an upper cover and a base, characterized in that: The cross-section of the upper cover is a closed U-shape, with an interface hole provided on the upper cover, and a right upper cover fixing hole and a left upper cover fixing hole provided on both sides of the interface hole. A first right buckle and a second right buckle are provided on the side of the upper cover. A debugging port is provided at the bottom of the upper cover, and the debugging port is in the shape of an open rectangle. A step-break of the upper cover is provided inside the debugging port. The step-break of the upper cover is in the shape of a concave-convex step and is an integral structure with the debugging port. The inner wall of the wire hole of the upper cover is in the shape of a convex arc and is located in the middle of the U-shaped upper cover. The base comprises a U-shaped structure, a bottom base corner and a rectangular bottom, the U-shaped structure and the rectangular bottom are respectively connected by two bottom base corners to form an integrated structure, the base is provided with two bottom shell fixing holes, the inner wall of the bottom shell fixing hole is provided with a thread, and a support frame is provided inside the base, which is a long strip cylinder, respectively located at the bottom and left and right sides of the base, wherein two of the support frames are respectively connected to the two bottom shell fixing holes, a snap protrusion right one and a snap protrusion right two are provided on the outer side surface of the base, and a bottom shell wire post is provided in the middle part of the bottom shell, which is hollow, and the outer diameter of the bottom shell wire post is equal to the inner diameter of the upper cover wire hole, and the two are in a nested relationship. When the bottom shell wire post is embedded in the upper cover wire hole, the contact mode of the outer wall of the bottom shell wire post and the inner surface of the upper cover wire hole belongs to the two arc-shaped circumferential mode, with a small contact surface; The upper edge of the integrated structure composed of the rectangular base and the U-shaped structure is a lower step structure with a higher inner side and a lower outer side, and the lower edge of the upper cover is an upper step structure with a lower inner side and a higher outer side, and the upper step structure and the lower step structure form a convex-concave structure connection; The inner wall of the bottom shell conductor post is in an outwardly convex arc shape; The inner walls of the upper cover wire hole and the corresponding bottom shell wire post are rectangular. When the bottom shell wire post is inserted into the upper cover wire hole, the upper cover and the bottom shell are embedded to form an outer shell structure. When the external cylindrical wire passes through the external structure, the contact mode between the outer surface of the wire and the inner surface of the inner wall of the bottom shell wire post is an arc-shaped circumscribed plane, which has a smaller contact surface and enhances the electromagnetic shielding effect; or, The inner wall of the upper cover wire hole and the corresponding bottom shell wire post are square. When the external cylindrical wire passes through the external structure, the inner surface of the inner wall of the bottom shell wire post is a tangent to the outer surface of the wire. The contact mode is an arc-shaped tangent to the plane, which has a smaller contact surface and enhances the electromagnetic shielding effect. Or, The inner walls of the upper cover wire hole and the corresponding bottom shell wire post are triangular. When the external cylindrical wire passes through the external structure, the inner surface of the inner wall of the bottom shell wire post is a tangent to the outer surface of the wire. The contact method is an arc-shaped and plane-tangent method, with a smaller contact area, thereby enhancing the electromagnetic shielding effect.

2. The housing structure for a high-precision electric energy meter current sensor according to claim 1 is characterized in that: There are square holes in the right first and right second snap buckles, which are arranged in parallel and respectively engage with the corresponding protrusions of the right first snap buckle protrusion and the right second snap buckle protrusion; a top cover step fracture is provided inside the debugging port.

3. The housing structure for a high-precision electric energy meter current sensor according to claim 1 or 2, characterized in that: The two upper cover fixing holes are arc-shaped, located on the left and right sides of the upper cover and have the same diameter, and the inner wall of the bottom shell fixing hole has no thread.

4. The housing structure for a high-precision electric energy meter current sensor according to claim 1 is characterized in that: The interface hole is rectangular.

5. The housing structure for a high-precision electric energy meter current sensor according to claim 1 is characterized in that: The bottom corners of the base are designed with arcs.

6. The housing structure for a high-precision electric energy meter current sensor according to claim 1, wherein: A current interface mark is provided on the upper portion of the interface hole.

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