A current sensor

Abstract

The utility model relates to current sensor technical field especially relates to a current sensor, including casing, magnetic core, hall element and lower cover, the casing is equipped with the test hole that can pass through for the cable of measuring, be equipped with the installation cavity in the casing, the installation cavity surrounds the test hole setting, the magnetic core is " C " shape, the magnetic core is installed in the installation cavity, the both ends of magnetic core have the gap, the hall element includes hall piece and signal pin, the hall piece is installed in the gap, the through -hole that is equipped with with installation cavity intercommunication on the casing, the through -hole is just opposite the gap, the lower cover is detachably connected in the casing, and the through -hole is blocked, be equipped with the perforation on the lower cover, the signal pin is by the perforation and is worn out. It is convenient to dismount hall element.

Description

Technical Field

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

[0002] A current sensor is a device used to detect the magnitude of current and convert it into a measurable signal.

[0003] An existing current sensor includes a housing, a Hall element, and a ring magnetic core. The Hall element is connected to the housing, and the signal pin of the Hall element is exposed outside the housing. The housing has a mounting cavity, and the ring magnetic core is mounted in the mounting cavity. The housing and the lower cover have through holes, and the ring magnetic core is arranged around the through holes. The ring magnetic core has a gap, and the Hall plate of the Hall element is located in the gap. When current flows through the cable passing through the through hole, a magnetic field is generated around the cable. The ring magnetic core is used to concentrate the magnetic field generated by the measured current. The Hall element outputs the measured voltage to an electrical device connected to the signal pin via the signal pin.

[0004] However, the existing current sensors are relatively troublesome to install and remove Hall elements. Summary of the Invention

[0005] This utility model provides a current sensor that aims to solve the problem that the existing current sensors have a relatively troublesome process of disassembling and assembling Hall elements.

[0006] To address the aforementioned problems, this utility model provides a current sensor, comprising a housing, a magnetic core, a Hall element, and a lower cover. The housing has a test hole through which a cable under test can pass, and a mounting cavity is provided inside the housing, the mounting cavity surrounding the test hole. The magnetic core is C-shaped and is mounted in the mounting cavity, with gaps at both ends of the magnetic core. The Hall element includes a Hall plate and signal pins, and the Hall plate is mounted within the gaps. The housing has a through hole communicating with the mounting cavity, the through hole being directly opposite the gap. The lower cover is detachably connected to the housing and blocks the through hole. The lower cover has a through hole through which the signal pin passes.

[0007] Optionally, the inner wall of the mounting cavity is provided with a receiving groove, and the Hall plate is installed in the receiving groove, which is directly opposite the through hole.

[0008] Optionally, the inner wall of the mounting cavity is provided with a first baffle, and there are two first baffles. The two first baffles are spaced apart along a first direction, and the Hall plate is located between the two first baffles. The first baffles are in contact with the outer surface of the Hall plate.

[0009] Optionally, a second baffle is provided on the inner wall of the mounting cavity. Two second baffles are provided and are spaced apart along a second direction. The Hall plate is located between the two second baffles, and the second baffles are in contact with the outer surface of the Hall plate. The first direction is perpendicular to the second direction, and the two first baffles and the two second baffles form the receiving groove.

[0010] Optionally, the lower cover includes a first sealing part and a second sealing part, the first sealing part is perpendicular to the second sealing part, the first sealing part is inserted into the through hole, the inner wall of the mounting cavity is provided with a first stop step, the side of the first sealing part facing the magnetic core is stopped and cooperated with the first stop step, and the through hole is provided in the first sealing part; The second sealing part is cylindrical and is arranged around the perforation. The second sealing part is inserted into the mounting cavity.

[0011] Optionally, the cavity sidewall of the mounting cavity is provided with a guide groove, the second sealing part is inserted into the guide groove, and the outer side of the second sealing part contacts the end face of the magnetic core; The second sealing part is provided with a clearance hole, and the first baffle is inserted into the clearance hole.

[0012] Optionally, the signal pin is Z-shaped, and the signal pin includes a first vertical segment, a horizontal segment, and a second vertical segment. The horizontal segment is connected between the first vertical segment and the second vertical segment. The first vertical segment is connected to the Hall plate, and the second vertical segment passes through the through hole. The side of the transverse section facing away from the Hall plate contacts the side of the first sealing portion facing the Hall plate, and the end face of the second baffle away from the housing abuts against the side of the transverse section facing the Hall plate.

[0013] Optionally, the current sensor further includes a nut sleeve, and the outer surface of the housing is provided with a connecting lug, the connecting lug being provided with a connecting hole, and the nut sleeve passing through the connecting hole.

[0014] Optionally, a positioning post is also provided on the outer peripheral surface of the housing.

[0015] Optionally, the outer surface of the housing is provided with a plurality of arc-shaped grooves, which are arranged around the test hole.

[0016] According to the current sensor provided in this utility model embodiment, a through hole communicating with the mounting cavity is provided on the housing. During installation, the Hall element can be installed in the mounting groove through the through hole, and the through hole is sealed by the lower cover. The perforation provided on the lower cover allows the quotation pin of the Hall element to pass through, which is convenient for disassembling and assembling the Hall element compared with the prior art. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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.

[0018] Figure 1 This is a schematic diagram of the structure of a current sensor provided in an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the decomposition process; Figure 3 for Figure 2 Schematic diagram of the middle shell structure; Figure 4 for Figure 2 Schematic diagram of the middle and lower cover; Figure 5 for Figure 2 Assembly diagram of the middle housing, Hall element and lower cover.

[0019] Reference numerals in the accompanying drawings: 1. Housing; 2. Test hole; 3. Connecting lug; 4. Connecting hole; 5. Nut sleeve; 6. Positioning post; 7. Arc groove; 8. Magnetic core; 9. Hall element; 10. Hall plate; 11. Signal pin; 12. First vertical section; 13. Horizontal section; 14. Second vertical section; 15. Lower cover; 16. Mounting cavity; 17. Through hole; 18. Stopping step; 19. First baffle; 20. Second baffle; 21. Protrusion; 22. Guide groove; 23. Receiving groove; 24. First sealing part; 25. Mounting groove; 26. Through hole; 27. Second sealing part; 28. Clearance hole. Detailed Implementation

[0020] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figures 1 to 5 As shown, an embodiment of the present invention provides a current sensor, including a housing 1, a magnetic core 8, a Hall element 9, and a lower cover 15. The housing 1 is provided with a test hole 2 through which the cable to be tested can pass. The housing 1 is provided with a mounting cavity 16, which is arranged around the test hole 2. The magnetic core 8 is C-shaped and is installed in the mounting cavity 16. There is a gap between the two ends of the magnetic core 8. The Hall element 9 includes a Hall plate 10 and a signal pin 11. The Hall plate 10 is installed in the gap.

[0023] The housing 1 has a through hole 17 that communicates with the mounting cavity 16. The through hole 17 is directly opposite the gap. The lower cover 15 is detachably connected to the housing 1 and blocks the through hole 17. The lower cover 15 has a through hole 26, through which the signal pin 11 passes.

[0024] In this embodiment, the signal pin 11 of the Hall element 9 can be connected to an electrical device, and the voltage signal measured by the Hall element 9 can be transmitted to the connected electrical device.

[0025] In this embodiment, a through hole 17 communicating with the mounting cavity 16 is provided on the housing 1. During installation, the Hall element 9 can be installed in the mounting groove 25 through the through hole 17, and the through hole 17 is blocked by the lower cover 15. The through hole 26 provided on the lower cover 15 allows the quotation pin of the Hall element 9 to pass through.

[0026] In this embodiment, the Hall element 9 is easy to install and remove.

[0027] In one embodiment, the inner wall of the mounting cavity 16 is provided with a receiving groove 23, and the Hall plate 10 is mounted in the receiving groove 23, which is directly opposite the through hole 17.

[0028] In this embodiment, the inner wall of the mounting cavity 16 is provided with a receiving groove 23 that is directly opposite to the through hole 17. The Hall plate 10 is installed in the receiving groove 23. The receiving groove 23 can play the role of installing and limiting the Hall plate 10, preventing the Hall plate 10 from shaking in the mounting cavity 16 and improving the stability of the Hall element 9.

[0029] In one embodiment, a first baffle 19 is provided on the inner wall of the mounting cavity 16. There are two first baffles 19, which are spaced apart along a first direction. The Hall plate 10 is located between the two first baffles 19, and the first baffles 19 are in contact with the outer surface of the Hall plate 10.

[0030] In this embodiment, the first direction is the front-back direction of the current sensor, and the second direction is the left-right direction of the current sensor.

[0031] In this embodiment, two first baffles 19 are spaced apart in the front-back direction. The gap between the two first baffles 19 is used to clamp the Hall plate 10. The inner side of the first baffle contacts the outer surface of the Hall plate 10 in the first direction. The two first baffles 19 can limit the Hall plate 10 in the first direction and prevent the Hall plate 10 from shaking in the first direction.

[0032] In one embodiment, a second baffle 20 is provided on the inner wall of the mounting cavity 16. There are two second baffles 20, which are spaced apart along a second direction. The Hall plate 10 is located between the two second baffles 20, and the second baffles 20 are in contact with the outer surface of the Hall plate 10.

[0033] The first direction is perpendicular to the second direction, and the two first baffles 19 and the two second baffles 20 form a receiving groove 23.

[0034] In this embodiment, two second baffles 20 are spaced apart along the second direction. The gap between the two second baffles 20 is for the Hall plate 10 to be inserted. The two second baffles 20 can clamp the Hall plate 10 in the second direction. The inner side of the second baffle 20 contacts the outer surface of the Hall plate 10 in the second direction, thereby limiting the Hall plate 10 in the second direction and restricting the displacement of the second baffle 20 along the second direction.

[0035] In this embodiment, two first baffles 19 and two second baffles 20 are spaced apart, forming a receiving groove 23. This facilitates design and manufacturing.

[0036] In one embodiment, the lower cover 15 includes a first sealing part 24 and a second sealing part 27. The first sealing part 24 is perpendicular to the second sealing part 27. The first sealing part 24 is inserted into the through hole 17. The inner wall of the mounting cavity 16 is provided with a first stop step 18. The side of the first sealing part 24 facing the magnetic core 8 is engaged with the first stop step 18. The through hole 26 is provided in the first sealing part 24.

[0037] The second sealing part 27 is cylindrical and is arranged around the perforation 26. The second sealing part 27 is inserted into the mounting cavity 16.

[0038] In this embodiment, the first sealing part 24 is connected to the second sealing part 27, and the second sealing part 27 is located on the upper side of the first sealing part 24.

[0039] In this embodiment, the thickness direction of the first sealing part 24 is consistent with the third direction, which is the vertical direction of the current sensor.

[0040] In this embodiment, the perforation 26 is located in the middle of the first sealing part 24, and the perforation 26 penetrates the first sealing part 24 in a third direction. The second sealing part 27 is arranged around the perforation 26.

[0041] In this embodiment, there are multiple through holes 26 and multiple signal pins 11, with each signal pin 11 corresponding to one of the multiple through holes 26.

[0042] In this embodiment, the first stop step 18 is disposed on the inner wall of the through hole 17. When the first sealing part 24 is inserted into the through hole 17, the upper side of the first sealing part 24 makes contact with the lower side of the first stop step 18. The second sealing part 27 is inserted into the mounting cavity 16 through the through hole 17.

[0043] In this embodiment, the lower side of the first sealing part 24 is flush with the lower side of the housing 1.

[0044] In one embodiment, a guide groove 22 is provided on the side wall of the mounting cavity 16, and a second sealing part 27 is inserted into the guide groove 22. The outer side of the second sealing part 27 is in contact with the end face of the magnetic core 8.

[0045] The second sealing part 27 is provided with a clearance hole 28, and the first baffle 19 is inserted into the clearance hole 28.

[0046] In this embodiment, the second sealing part 27 is provided with an avoidance hole 28, and the first baffle 19 is inserted into the avoidance hole 28. The avoidance hole 28 is provided to avoid the first baffle 19 and to facilitate the installation of the second sealing part 27 into the mounting groove 25.

[0047] In this embodiment, a guide groove 22 is provided on the side wall of the mounting cavity 16, which means that the guide groove 22 is provided on the inner wall of the mounting cavity 16 so that the second sealing part 27 can enter the mounting cavity 16.

[0048] In this embodiment, the guide groove 22 is formed by the gap between the first baffle 19 and the inner wall of the through hole 17.

[0049] In one embodiment, the signal pin 11 is Z-shaped and includes a first vertical segment 12, a horizontal segment 13 and a second vertical segment 14. The horizontal segment 13 is connected between the first vertical segment 12 and the second vertical segment 14. The first vertical segment 12 is connected to the Hall plate 10 and the second vertical segment 14 is disposed in the through hole 26.

[0050] The side of the transverse section 13 facing away from the Hall plate 10 contacts the side of the first sealing part 24 facing the Hall plate 10, and the end face of the second baffle 20 away from the housing 1 abuts against the side of the transverse section 13 facing the Hall plate 10.

[0051] In this embodiment, the top end of the first vertical segment 12 is connected to the Hall plate 10, one end of the horizontal segment 13 is connected to the bottom end of the first vertical segment 12, and the top end of the second vertical segment 14 is connected to the other end of the horizontal segment 13.

[0052] In this embodiment, the lower side of the transverse segment 13 contacts the upper side of the first blocking part 24, and the upper side of the transverse segment 13 contacts the bottom surface of the second baffle 20. The second baffle 20 and the first blocking part 24 limit the transverse segment 13 in the vertical direction.

[0053] In this embodiment, the upper side of the first sealing part 24 is provided with an installation groove 25, the transverse section 13 is disposed in the installation groove 25, and the through hole 26 is disposed on the bottom wall of the installation groove 25.

[0054] In this embodiment, the bottom surface of the second baffle 20 is provided with a protrusion 21, which is inserted downward into the mounting groove 25 and abuts against the upper side of the transverse section 13.

[0055] In one embodiment, the current sensor further includes a nut sleeve 5, and the outer surface of the housing 1 is provided with a connecting lug 3, which is provided with a connecting hole 4, and the nut sleeve 5 passes through the connecting hole 4.

[0056] In this embodiment, the connecting lug 3 protrudes from the outer surface of the housing 1, and the nut sleeve 5 is inserted into the connecting hole 4 of the connecting lug 3. By inserting screws through the connecting hole 4 and the mounting hole of the electrical device for mounting the current sensor, the housing 1 is connected to the electrical device by screws.

[0057] In this embodiment, the housing 1 is installed by the nut sleeve 5, which is simple in structure and easy to design.

[0058] In one embodiment, a positioning post 6 is also provided on the outer peripheral surface of the housing 1.

[0059] In this embodiment, the positioning post 6 is located on the side of the nut sleeve 5 and serves as a guide when the housing 1 is installed on the aforementioned electrical device, so as to make the nut sleeve 5 aligned with the mounting hole and avoid misalignment.

[0060] In one embodiment, a plurality of arc-shaped grooves 7 are provided on the outer surface of the housing 1, and the plurality of arc-shaped grooves 7 are arranged around the test hole 2.

[0061] In this embodiment, the arc-shaped groove 7 is located on the front side of the housing 1 near the four corners, which can improve the creepage distance of the current sensor.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] According to the current sensor provided in this utility model embodiment, a through hole 17 communicating with the mounting cavity 16 is provided on the housing 1. During installation, the Hall element 9 can be installed in the mounting groove 25 through the through hole 17, and the through hole 17 is blocked by the lower cover 15. The through hole 26 provided on the lower cover 15 allows the quotation pin of the Hall element 9 to pass through. Compared with the prior art, it is convenient to disassemble and assemble the Hall element 9.

[0064] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A current sensor, characterized in that, The device includes a housing (1), a magnetic core (8), a Hall element (9), and a lower cover (15). The housing (1) has a test hole (2) through which the cable under test can pass. The housing (1) has a mounting cavity (16) inside, which surrounds the test hole (2). The magnetic core (8) is C-shaped and is installed in the mounting cavity (16). The magnetic core (8) has gaps at both ends. The Hall element (9) includes a Hall plate (10) and a signal pin (11). The Hall plate (10) is installed in the gap. The housing (1) is provided with a through hole (17) communicating with the mounting cavity (16). The through hole (17) is directly opposite the gap. The lower cover (15) is detachably connected to the housing (1) and blocks the through hole (17). The lower cover (15) is provided with a through hole (26), and the signal pin (11) passes through the through hole (26).

2. The current sensor according to claim 1, characterized in that, The inner wall of the mounting cavity (16) is provided with a receiving groove (23), and the Hall plate (10) is installed in the receiving groove (23), which is directly opposite the through hole (17).

3. The current sensor according to claim 2, characterized in that, The inner wall of the mounting cavity (16) is provided with a first baffle (19), and there are two first baffles (19). The two first baffles (19) are spaced apart along a first direction. The Hall plate (10) is located between the two first baffles (19), and the first baffle (19) is in contact with the outer surface of the Hall plate (10).

4. The current sensor according to claim 3, characterized in that, The inner wall of the mounting cavity (16) is provided with a second baffle (20), and there are two second baffles (20). The two second baffles (20) are spaced apart along the second direction. The Hall plate (10) is located between the two second baffles (20), and the second baffles (20) are in contact with the outer surface of the Hall plate (10). The first direction is perpendicular to the second direction, and the two first baffles (19) and the two second baffles (20) form the receiving groove (23).

5. The current sensor according to claim 4, characterized in that, The lower cover (15) includes a first sealing part (24) and a second sealing part (27). The first sealing part (24) is perpendicular to the second sealing part (27). The first sealing part (24) is inserted into the through hole (17). The inner wall of the mounting cavity (16) is provided with a first stop step (18). The side of the first sealing part (24) facing the magnetic core (8) is stopped and cooperated with the first stop step (18). The through hole (26) is provided in the first sealing part (24). The second sealing part (27) is cylindrical and is arranged around the perforation (26). The second sealing part (27) is inserted into the mounting cavity (16).

6. The current sensor according to claim 5, characterized in that, The mounting cavity (16) has a guide groove (22) on its side wall. The second sealing part (27) is inserted into the guide groove (22), and the outer side of the second sealing part (27) is in contact with the end face of the magnetic core (8). The second sealing part (27) is provided with a clearance hole (28), and the first baffle (19) is inserted into the clearance hole (28).

7. The current sensor according to claim 6, characterized in that, The signal pin (11) is Z-shaped and includes a first vertical segment (12), a horizontal segment (13) and a second vertical segment (14). The horizontal segment (13) is connected between the first vertical segment (12) and the second vertical segment (14). The first vertical segment (12) is connected to the Hall plate (10), and the second vertical segment (14) passes through the through hole (26). The side of the transverse section (13) facing away from the Hall plate (10) contacts the side of the first sealing part (24) facing the Hall plate (10), and the end face of the second baffle (20) away from the housing (1) abuts against the side of the transverse section (13) facing the Hall plate (10).

8. The current sensor according to claim 1, characterized in that, The current sensor also includes a nut sleeve (5), and the outer surface of the housing (1) is provided with a connecting ear (3), and the connecting ear (3) is provided with a connecting hole (4), and the nut sleeve (5) passes through the connecting hole (4).

9. The current sensor according to claim 8, characterized in that, The outer circumferential surface of the housing (1) is also provided with a positioning post (6).

10. The current sensor according to claim 1, characterized in that, The outer surface of the housing (1) is provided with a plurality of arc-shaped grooves (7), and the plurality of arc-shaped grooves (7) are arranged around the test hole (2).

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