Current sensor capable of increasing creepage distance

Abstract

The utility model discloses a current sensor capable of increasing a creepage distance, the current sensor capable of increasing the creepage distance comprises an installation main body, a magnetic core, a Hall chip and at least one pair of blocking blocks, the installation main body comprises a shell, the shell is penetrated along the thickness direction to form a penetrating through hole used for penetrating through an electrified copper bar, and the penetrating through hole is used for penetrating through the electrified copper bar. The magnetic core is arranged on the shell and located on the periphery of the extending direction of the penetrating through hole, the magnetic core forms an air gap space used for arranging the Hall chip, and the pair of blocking blocks are arranged on the shell in an opposite mode and located at the two ends of the shell in the thickness direction respectively. And the two blocking blocks are arranged on the shell and are respectively close to the Hall chip, so that when the electrified copper bar creeps towards the Hall chip from the edge of the inner wall of the penetrating through hole along the shell, the creepage distance is increased through blocking of the blocking blocks, and meanwhile, the situation that too much space is occupied is avoided.

Description

Technical Field

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

[0002] With the development of technology, current sensors have emerged to automatically detect current. A current sensor consists of a housing, a magnetic core, and a Hall chip. The magnetic core is installed inside the housing, and the Hall chip is placed in the air gap formed by the magnetic core. A current-carrying copper busbar passes through the housing. When the magnitude of the current passing through the current-carrying copper busbar changes, the change in the magnitude of the magnetic flux passing through the Hall chip is detected, thereby detecting the change in the current passing through the current-carrying copper busbar.

[0003] The creepage distance between the Hall chip's pins and the edge where the energized copper busbar passes through the housing is defined as the distance the Hall chip's pins extend along the housing surface. To meet the high-voltage requirements of the user's electric drive controller, a current sensor with a longer creepage distance needs to be installed on the electric drive controller.

[0004] In the prior art, in order to obtain a longer creepage distance between the energized copper busbar and the pins of the Hall chip, a current sensor with a larger housing volume is used. However, using a larger current sensor will encroach on the space in the electric drive controller used to install other components. At the same time, manufacturing a larger current sensor increases production costs. Utility Model Content

[0005] To solve the above-mentioned technical problems and achieve at least one advantage of this utility model, this utility model provides a current sensor that can increase the creepage distance, wherein the current sensor that can increase the creepage distance includes:

[0006] The mounting body includes a housing with a through-hole formed therethrough along its thickness. The through-hole is used to pass through a power-conducting copper busbar.

[0007] A magnetic core is disposed in the housing, the magnetic core is disposed on the outer periphery of the through hole extending in the direction of the through hole, and the magnetic core forms an air gap space;

[0008] Hall effect chip, wherein the Hall effect chip is partially disposed in the air gap space; and

[0009] At least one pair of blocking blocks, each blocking block including a blocking portion, the pair of blocking portions of the pair of blocking blocks being disposed on the housing in an opposing manner, the pair of blocking portions being located at both ends in the thickness direction of the housing, and the pair of blocking portions being close to the Hall chip.

[0010] According to one embodiment of the present invention, the obstruction block further includes a pair of through portions, the pair of through portions being respectively disposed at the ends of the pair of obstruction portions away from the housing, the through portions being used to pass through the positioning through holes of the circuit board.

[0011] According to one embodiment of the present invention, the obstruction block further includes a pair of latching portions, the pair of latching portions being respectively disposed in the pair of through portions, and the pair of latching portions extending backward along the thickness direction of the housing, the latching portions having a retaining wall formed on the side of the latching portion close to the housing, so that when the pair of latching portions pass through the positioning through hole, the retaining wall of the pair of latching portions adheres to the circuit board to prevent the obstruction block from detaching entirely from the circuit board.

[0012] According to one embodiment of the present invention, the obstruction block further includes a pair of latching portions, the pair of latching portions being respectively disposed on the pair of through portions, and the pair of latching portions extending toward each other along the thickness direction of the housing. Each latching portion has a retaining wall, the retaining wall being formed on the side of the latching portion close to the housing, so that when the pair of latching portions passes through the positioning through hole, the retaining wall of the pair of latching portions adheres to the circuit board to prevent the obstruction block from detaching entirely from the circuit board.

[0013] According to one embodiment of the present invention, the end of the latching portion near the housing is defined as the near-shell end, and the end of the latching portion away from the housing is defined as the far-shell end. The distance between the near-shell end and the through portion is greater than the distance between the far-shell end and the through portion, and a guide wall is formed between the near-shell end and the far-shell end.

[0014] According to one embodiment of the present invention, the housing further forms a mounting groove, and the housing is partially recessed towards the through hole to form the mounting groove. The magnetic core is disposed in the housing in such a way that the air gap space corresponds to the mounting groove, and the magnetic core is located on the outer periphery in the extension direction of the through hole. The Hall chip includes a chip body and at least two pairs of chip pins. The chip body is disposed in the mounting groove, and the two pairs of chip pins are symmetrically disposed in the chip body, and both pairs of chip pins extend away from the mounting groove.

[0015] According to one embodiment of the present invention, the mounting body further includes a cover body, the cover body including a cover body portion adapted to the mounting groove, the cover body having a chip receiving space for accommodating the chip body and a through hole communicating with the chip receiving space, the through hole being used to pass through the chip pin, the cover body forming a core wall, the core wall being formed at the end of the inner wall of the chip receiving space near the through hole.

[0016] According to one embodiment of the present invention, the mounting body further includes at least one reinforcing block, the reinforcing block being fixed to the inner wall of the mounting groove, and the cover body also having an insertion space, the insertion space being adapted to the reinforcing block, and the insertion space being used to accommodate the reinforcing block.

[0017] According to one embodiment of the present invention, the housing has at least one pair of first fixed fastening portions, the pair of first fixed fastening portions being arranged opposite to each other, and opposite portions of the housing extending toward each other to form a pair of first fixed fastening portions. The cover also includes a fastening member, the fastening member being connected to the cover body, the fastening member having at least one pair of first snap-in portions, the pair of first snap-in portions being arranged opposite to each other and corresponding to a pair of first fixed fastening portions, so that when the cover body is inserted into the mounting groove, the pair of first snap-in portions of the fastening member respectively abut against a pair of first fixed fastening portions to fix the cover body.

[0018] According to one embodiment of the present invention, the housing further has at least one pair of second fixed fastening portions, which are arranged opposite to each other. The opposite portions of the housing extend backward to form a pair of second fixed fastening portions. The center lines of the pair of first fixed fastening portions and the pair of second fixed fastening portions are located on the same straight line. The fastening member further has at least one pair of second snap-in portions, which are arranged opposite to each other and correspond to the pair of second fixed fastening portions respectively. When the cover body is inserted into the mounting groove and the pair of first snap-in portions abut against the pair of first fixed fastening portions respectively, the cover body is fixed by the pair of second snap-in portions abutting against the pair of second fixed fastening portions respectively. Attached Figure Description

[0019] Figure 1 A perspective view of a preferred embodiment of the present invention is shown.

[0020] Figure 2 An exploded view of a preferred embodiment of the present invention is shown, including components such as the mounting body, the magnetic core, the Hall chip, the obstruction block, and the circuit board.

[0021] Figure 3 It shows Figure 2 A magnified view of point A in the middle.

[0022] Figure 4 This diagram shows a three-dimensional view of the structure of the mounting main component, the magnetic core, and the obstruction block according to a preferred embodiment of the present invention.

[0023] Figure 5 A perspective view of the cover body according to a preferred embodiment of the present invention is shown.

[0024] Figure 6 A schematic cross-sectional view of the cover body according to a preferred embodiment of the present invention is shown.

[0025] Figure 7 A cross-sectional view of a preferred embodiment of the present invention is shown.

[0026] Figure 8 It shows Figure 7 A magnified view of point B in the middle. Detailed Implementation

[0027] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0028] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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, the above terms should not be construed as limitations on this utility model.

[0029] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0030] refer to Figures 1 to 8 A preferred embodiment of the present invention, a current sensor with increased creepage distance, will be described in detail below, wherein the current sensor with increased creepage distance includes a mounting body 10, a magnetic core 20, a Hall chip 30, and at least a pair of blocking blocks 40.

[0031] Specifically, the mounting body 10 includes a housing 11. The housing 11 forms a through hole 1101. The housing 11 extends through the through hole 1101 along its thickness direction, and the through hole 1101 is used to pass through a power-conducting copper busbar 91.

[0032] The magnetic core 20 is disposed on the housing 11, and the magnetic core 20 is disposed on the outer periphery of the through hole 1101 extending in the direction of extension, and the magnetic core 20 forms an air gap space 201.

[0033] The Hall chip 30 is partially disposed in the air gap space 201.

[0034] The obstruction block 40 includes an obstruction portion 41. A pair of obstruction portions 41 of the pair of obstruction blocks 40 are disposed on the housing 11 in an opposing manner. The pair of obstruction portions 41 are respectively located at both ends in the thickness direction of the housing 11, and the pair of obstruction portions 41 are respectively close to the Hall chip 30.

[0035] It should be noted that when the energized copper busbar 91 creeps along the surface of the housing 11 to the Hall chip 30 from the edge of the inner wall of the through hole 1101, it needs to bypass the obstruction part 41 to creep, thereby increasing the creep distance.

[0036] Preferably, the obstruction block 40 further includes a pair of through portions 42. The pair of through portions 42 are respectively disposed at the ends of the pair of obstructions 41 away from the housing 11. The through portions 42 are used to pass through a positioning through hole 9201 of a circuit board 92, thereby fixing the position of the current sensor assembly with increased creepage distance relative to the circuit board 92, preventing the current sensor assembly with increased creepage distance from failing due to displacement.

[0037] In this embodiment, the obstruction block 40 further includes a pair of latching portions 43, which are respectively connected to a pair of through portions 42. The pair of latching portions 43 extend backward along the thickness direction of the housing 11. Each latching portion 43 has a retaining wall 431, which is formed on the side of the latching portion 43 near the housing 11. When the pair of latching portions 43 pass through the positioning through hole 9201, they adhere to the surface of the circuit board 92 through the retaining wall 431, so as to prevent the obstruction block 40 from detaching from the circuit board 92 as a whole. This prevents the current sensor with increased creepage distance from detaching from the circuit board 92 as a whole, thus ensuring the normal functioning of the current sensor with increased creepage distance.

[0038] In another modified embodiment, the obstruction block 40 further includes a pair of latching portions 43, which are respectively connected to a pair of through portions 42, and the pair of latching portions 43 extend towards each other along the thickness direction of the housing 11. Each latching portion 43 has a retaining wall 431, which is formed on the side of the latching portion 43 near the housing 11. When the pair of latching portions 43 pass through the positioning through hole 9201, the retaining wall 431 of the pair of latching portions 43 adheres to the surface of the circuit board 92, so as to prevent the obstruction block 40 from detaching from the circuit board 92 as a whole, thereby preventing the current sensor that can increase the creepage distance from detaching from the circuit board 92 as a whole, and ensuring that the current sensor that can increase the creepage distance can function normally.

[0039] To enable those skilled in the art to understand this utility model, in at least one embodiment of this utility model, the obstruction block 40 is further described by way of example, which includes a pair of latching parts 43, the pair of latching parts 43 being respectively disposed on a pair of through parts 42, and the pair of latching parts 43 extending backward along the thickness direction of the housing 11, the latching part 43 having a latching wall 431, the latching wall 431 being formed on the side of the latching part 43 near the housing 11.

[0040] Specifically, the snap-fit ​​portion 43 is defined as a near-shell end at the end close to the housing 11 and as a far-shell end at the end far from the housing 11. The distance between the near-shell end and the through portion 42 is greater than the distance between the far-shell end and the through portion 42, and a guide wall 432 is formed between the near-shell end and the far-shell end.

[0041] As an example, during the process of the through portion 42 driving the latching portion 43 through the positioning through hole 9201 of the circuit board 92, the inner wall edge of the positioning through hole 9201 will slide along the guide wall 432 of the latching portion 43. At the same time, the pair of latching portions 43 apply force to the through portion 42, and the pair of through portions 42 will deform in opposite directions due to the force, so that the pair of latching portions 43 can pass smoothly through the positioning through hole 9201.

[0042] Furthermore, after the pair of latching parts 43 have completely passed through the positioning through hole 9201, the pair of latching parts 43 move backward due to the rebound of the pair of through parts 42, thereby causing the latching walls 431 of the pair of latching parts 43 to stick to the surface of the circuit board 92, so as to fix the relative position between the current sensor assembly that can increase the creepage distance and the circuit board 92 and prevent shaking.

[0043] Preferably, the obstruction part 41, the through part 42 and the latching part 43 are integrally formed.

[0044] Preferably, the housing 11 further forms a mounting groove 1102. The housing 11 is partially recessed into the through hole 1101 to form the mounting groove 1102. The magnetic core 20 is disposed on the housing 11 in such a way that the air gap space 201 corresponds to the mounting groove 1102, and the magnetic core 20 is located on the outer periphery in the extending direction of the through hole 1101.

[0045] The Hall effect chip 30 includes a chip body 31 and at least two pairs of chip pins 32. The chip body 31 is disposed in the mounting groove 1102. The two pairs of chip pins 32 are symmetrically disposed on the chip body 31, and both pairs of chip pins 32 extend away from the mounting groove 1102.

[0046] It is understood that the energized copper busbar 91 penetrates the through-hole 1101, and when the current flowing through the energized copper busbar 91 changes, the creepage path from the edge of the inner wall of the through-hole 1101 along the surface of the housing 11 to the chip pin 32 is obstructed by the obstruction part 41. This obstruction forces the creepage to bypass the obstruction part 41 to reach the chip pin 32, thus increasing the creepage distance. Compared to using a current sensor with a larger housing 11, the obstruction part 41 allows a current sensor of the same volume to achieve a longer creepage distance during use, meeting user needs and reducing spatial obstruction when other components are mounted on the circuit board 92.

[0047] Preferably, the mounting body 10 further includes a cover 12. The cover 12 includes a cover body 121. The cover body 121 is partially adapted to the mounting groove 1102. The cover body 121 has a chip receiving space 12101 for receiving the chip body 31 and a through hole 12102 communicating with the chip receiving space 12101. The through hole 12102 is used to pass through the chip pin 32. The cover body 121 forms a core wall 1211, which is formed at the end of the inner wall of the chip receiving space 12101 near the through hole 12102.

[0048] It should be noted that after the chip body 31 is placed in the mounting groove 1102, the cover body 121 is partially inserted into the mounting groove 1102. At this time, the chip body 31 is accommodated in the chip accommodating space 12101 of the cover body 121, and the chip pins 32 pass through the through hole 12102. The sidewall of the chip accommodating space 12101 restricts the position of the chip body 31 in the mounting groove 1102, and the sidewall of the through hole 12102 also restricts the position of the chip pins 32 in the mounting groove 1102. At the same time, the pressure core wall 1211 presses against the end of the chip body 31 near the chip pins 32 to fix the position of the chip body 31 and further prevent the chip body 31 and the chip pins 32 from shaking as a whole in the mounting groove 1102.

[0049] Preferably, the mounting body 10 further includes at least one reinforcing block 13, which is fixed to the inner wall of the mounting groove 1102. The cover body 121 also has an insertion space 12103. The insertion space 12103 is adapted to the reinforcing block 13 and is used to accommodate the reinforcing block 13.

[0050] It is understood that when the cover body 121 is partially inserted into the mounting groove 1102 and the reinforcing block 13 is inserted into the insertion space 12103, the reinforcing block 13 will prevent the cover body 121 from shaking in the mounting groove 1102 because it is attached to the inner wall of the insertion space 12103, thereby improving the stability of the chip body 31 when it is located in the chip receiving space 12101.

[0051] Preferably, the housing 11 has at least one pair of first fixed fastening portions 111. The pair of first fixed fastening portions 111 are arranged opposite to each other. Opposite portions of the housing 11 extend toward each other to form a pair of first fixed fastening portions 111. The cover 12 further includes a clamping member 122. The clamping member 122 is connected to the cover body 121. The clamping member 122 has at least one pair of first snap-in portions 1221. The pair of first snap-in portions 1221 are arranged opposite to each other, and each pair of first snap-in portions 1221 corresponds to a pair of first fixed fastening portions 111. The pair of first snap-in portions 1221 can abut against the first fixed fastening portions 111 so that when the cover body 121 is inserted into the mounting groove 1102, the cover body 121 is fixed by the pair of first snap-in portions 1221 of the clamping member 122 abutting against the pair of first fixed fastening portions 111, preventing the cover body 121 from detaching from the mounting groove 1102.

[0052] Preferably, the housing 11 further has at least one pair of second fixed fastening portions 112. The pair of second fixed fastening portions 112 are arranged opposite to each other. Opposite portions of the housing 11 extend backward to form a pair of second fixed fastening portions 112. The center lines of the pair of first fixed fastening portions 111 and the center lines of the pair of second fixed fastening portions 112 are located on the same straight line. The fastening member 122 further has at least one pair of second fastening portions 1222. A pair of second snap-fit ​​portions 1222 are arranged opposite to each other, and each pair of second snap-fit ​​portions 1222 corresponds to a pair of second fixed snap-fit ​​portions 112. The pair of second snap-fit ​​portions 1222 can abut against the second fixed snap-fit ​​portions 112. When the cover body 121 is inserted into the mounting groove 1102 and the pair of first snap-fit ​​portions 1221 abut against the pair of first fixed snap-fit ​​portions 111, the pair of second snap-fit ​​portions 1222 abut against the pair of second fixed snap-fit ​​portions 112 to further fix the cover body 121, so as to further prevent the cover body 121 from detaching from the mounting groove 1102.

[0053] It is worth mentioning that, since the pair of first fixed fastening portions 111 and the pair of second fixed fastening portions 112 are formed by opposite portions of the housing 11 extending towards each other and away from each other respectively, when the pair of first fastening portions 1221 abut against the pair of first fixed fastening portions 111 and the pair of second fastening portions 1222 abut against the pair of second fixed fastening portions 112, the pair of second fastening portions 1222 abutting against the pair of second fixed fastening portions 112 can apply a force away from the cover body 121 to the pair of first fastening portions 1221, so that the first fastening portions 1221 abut against the first fixed fastening portions 111 more stably. At the same time, the pair of first fastening portions 1221 abutting against the pair of first fixed fastening portions 111 can apply a force towards the cover body 121 to the pair of second fastening portions 1222, so that the second fastening portions 1222 abut against the second fixed fastening portions 112 more stably, thereby improving the stability of the cover body 121 inserted into the mounting groove 1102.

[0054] Preferably, the cover 12 further has at least one limiting strip 123. The limiting strip 123 is disposed in the through hole 12102 and is located between adjacent chip pins 32, so as to improve the stability of the chip pins 32 after passing through the through hole 12102 when the limiting strip 123 is attached to the surface of the chip pins 32, thereby preventing the chip pins 32 from shaking within the through hole 12102.

[0055] Preferably, the mounting body 10 further includes a plurality of connection pins 15. The connection pins 15 are disposed on the housing 11 and are used for soldering the circuit board 92.

[0056] Preferably, the mounting body 10 further includes a plurality of positioning elements 14. The positioning elements 14 are disposed on the housing 11. The positioning elements 14 are used to pass through a fixing through hole 9202 of the circuit board 92, so that when the connecting pin 15 is soldered to the circuit board 92, the relative position between the current sensor that can increase the creepage distance and the circuit board 92 is fixed by the connecting pin 15 passing through the fixing through hole 9202.

[0057] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A current sensor that can increase creepage distance, characterized in that, The current sensor that can increase the creepage distance includes: The mounting body includes a housing with a through-hole formed therethrough along its thickness. The through-hole is used to pass through a power-conducting copper busbar. A magnetic core is disposed in the housing, the magnetic core is disposed on the outer periphery of the through hole extending in the direction of the through hole, and the magnetic core forms an air gap space; Hall effect chip, wherein the Hall effect chip is partially disposed in the air gap space; and At least one pair of blocking blocks, each blocking block including a blocking portion, the pair of blocking portions of the pair of blocking blocks being disposed on the housing in an opposing manner, the pair of blocking portions being located at both ends in the thickness direction of the housing, and the pair of blocking portions being close to the Hall chip.

2. The current sensor with increased creepage distance according to claim 1, characterized in that, The obstruction block also includes a pair of through portions, which are respectively disposed at the ends of the pair of obstructions away from the housing, and the through portions are used to pass through the positioning through holes of the circuit board.

3. The current sensor with increased creepage distance according to claim 2, characterized in that, The obstruction block further includes a pair of latching portions, which are respectively disposed in the pair of through portions and extend backward along the thickness direction of the housing. Each latching portion has a retaining wall, which is formed on the side of the latching portion close to the housing, so that when the pair of latching portions passes through the positioning through hole, the retaining wall of the pair of latching portions adheres to the circuit board to prevent the obstruction block from detaching from the circuit board as a whole.

4. The current sensor with increased creepage distance according to claim 2, characterized in that, The obstruction block further includes a pair of latching portions, which are respectively disposed in the pair of through portions and extend towards each other along the thickness direction of the housing. Each latching portion has a retaining wall, which is formed on the side of the latching portion close to the housing, so that when the pair of latching portions passes through the positioning through hole, the retaining wall of the pair of latching portions adheres to the circuit board to prevent the obstruction block from detaching from the circuit board as a whole.

5. The current sensor with increased creepage distance according to claim 3, characterized in that, The snap-fit ​​portion is defined as the near-shell end at the end closest to the housing and as the far-shell end at the end furthest from the housing. The distance between the near-shell end and the through portion is greater than the distance between the far-shell end and the through portion, and a guide wall is formed between the near-shell end and the far-shell end.

6. The current sensor with increased creepage distance according to claim 5, characterized in that, The housing also forms a mounting groove, and the housing is partially recessed towards the through hole to form the mounting groove. The magnetic core is disposed in the housing in such a way that the air gap space corresponds to the mounting groove, and the magnetic core is located on the outer periphery in the extension direction of the through hole. The Hall chip includes a chip body and at least two pairs of chip pins. The chip body is disposed in the mounting groove, and the two pairs of chip pins are symmetrically disposed in the chip body, and both pairs of chip pins extend away from the mounting groove.

7. The current sensor with increased creepage distance according to claim 6, characterized in that, The mounting body further includes a cover body, which includes a cover body portion that is adapted to the mounting groove. The cover body has a chip receiving space for accommodating the chip body and a through hole communicating with the chip receiving space. The through hole is used to pass through the chip pins. The cover body forms a core wall, which is formed at the end of the inner wall of the chip receiving space near the through hole.

8. The current sensor with increased creepage distance according to claim 7, characterized in that, The mounting body also includes at least one reinforcing block, which is fixed to the inner wall of the mounting groove. The cover body also has an insertion space, which is adapted to the reinforcing block and is used to accommodate the reinforcing block.

9. The current sensor with increased creepage distance according to claim 8, characterized in that, The housing has at least one pair of first fixed fastening portions, which are arranged opposite to each other. Opposite portions of the housing extend toward each other to form a pair of first fixed fastening portions. The cover also includes a fastening member connected to the cover body. The fastening member has at least one pair of first snap-in portions, which are arranged opposite to each other and correspond to the pair of first fixed fastening portions. When the cover body is inserted into the mounting groove, the pair of first snap-in portions of the fastening member abut against the pair of first fixed fastening portions to fix the cover body.

10. The current sensor with increased creepage distance according to claim 9, characterized in that, The housing also has at least one pair of second fixed fasteners, which are arranged opposite to each other. The opposite portions of the housing extend backward to form a pair of second fixed fasteners. The center lines of the pair of first fixed fasteners and the pair of second fixed fasteners are on the same straight line. The fastening member also has at least one pair of second snap-in portions, which are arranged opposite to each other and correspond to the pair of second fixed fasteners respectively. When the cover body is inserted into the mounting groove and the pair of first snap-in portions abut against the pair of first fixed fasteners respectively, the cover body is fixed by the pair of second snap-in portions abutting against the pair of second fixed fasteners respectively.

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