Charging device

Abstract

The utility model discloses an embodiment provides a kind of charging equipment, comprising: main casing, is equipped with containing cavity;Pin module, including pin piece and mounting assembly, the mounting assembly is connected with the main casing in the containing cavity, the pin piece is rotatably arranged between the main casing and the mounting assembly;Charging module, is located in the containing cavity, the charging module is located at the side of the mounting assembly away from the pin piece, and is electrically connected with the pin module;Shielding piece, between the mounting assembly and the charging module is equipped with.The embodiment is by setting shielding piece between charging module and pin module, so that effectively reduce the electromagnetic compatibility interference generated to commercial power when using.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment technology, and in particular to a charging device. Background Technology

[0002] With the increasing portability of consumer electronics, foldable plug-in charging devices have become mainstream in the market due to their 20%-35% size reduction. However, this highly compressed internal space results in a much smaller distance between the plug module and internal electronic components compared to traditional charging devices. This significant reduction in physical distance directly leads to a substantial increase in parasitic capacitance and mutual inductance between the two, causing electromagnetic compatibility (EMC) interference to the mains power supply during use. Therefore, optimizing the design and suppressing interference within limited space has become a critical issue that urgently needs to be addressed in foldable plug-in charging devices. Utility Model Content

[0003] Therefore, in order to overcome at least some of the defects and deficiencies in the prior art, this utility model provides a charging device with a compact internal space layout, which reduces the generation of electromagnetic compatibility interference to the mains power.

[0004] Specifically, the present invention provides a charging device comprising: a main housing having a receiving cavity; a plug module including a plug and a mounting assembly, the mounting assembly being connected to the main housing within the receiving cavity, the plug being rotatably disposed between the main housing and the mounting assembly; a charging module disposed within the receiving cavity, the charging module being located on the side of the mounting assembly opposite to the plug and electrically connected to the plug module; and a shielding member disposed between the mounting assembly and the charging module.

[0005] In an embodiment of this utility model, the mounting assembly has a mounting surface on the side opposite to the pin, and the shielding member is disposed on the mounting surface.

[0006] In an embodiment of this utility model, the charging module includes a transformer, and the shielding component is disposed between the transformer and the mounting assembly. The shielding component includes a metal shielding layer and a first insulating layer, with the first insulating layer located on the side of the metal shielding layer facing the transformer.

[0007] In an embodiment of this utility model, a second insulating layer is provided on the side of the metal shielding layer facing the mounting assembly.

[0008] In an embodiment of this utility model, an adhesive layer is provided on the side of the second insulating layer facing the mounting assembly, and the second insulating layer is connected to the mounting surface through the adhesive layer.

[0009] In an embodiment of this utility model, the area of ​​the shielding component is greater than or equal to the area of ​​the mounting surface.

[0010] In an embodiment of this invention, the area of ​​the first insulating layer is larger than the area of ​​the metal shielding layer.

[0011] In an embodiment of this utility model, the metal shielding layer is fixed between the first insulating layer and the second insulating layer by adhesive. The metal shielding layer is a copper sheet, and the first insulating layer and the second insulating layer are both plastic sheets.

[0012] In an embodiment of this utility model, one end of the mounting component is provided with a stop groove, and the other end of the mounting component is provided with a screw hole. The mounting component is provided with a shaft receiving groove corresponding to the rotating shaft of the pin module. The shaft receiving groove is located between the stop groove and the screw hole. The inner wall of the main housing is provided with a stop part and a stud respectively corresponding to the stop groove and the screw hole. When the mounting component is connected to the main housing, the stop part is engaged with the stop groove, and the screw hole and the stud are fixedly connected by screws.

[0013] In an embodiment of this utility model, the mounting component has a positioning protrusion on the side away from the shielding component, and the positioning protrusion is located near the end of the mounting component where the stop groove is located; the inner wall of the main housing has a positioning groove, and when the mounting component is connected to the main housing, the positioning protrusion is limited to the positioning groove.

[0014] As can be seen from the above, the technical features of this utility model can have one or more of the following beneficial effects: By providing a shielding component between the plug module and the charging module, high-frequency noise interference and harmonic current interference generated by the transformer and switching elements in the charging module can be effectively blocked, effectively reducing electromagnetic compatibility (EMC) interference to the mains power during operation. Secondly, the shielding component does not require excessive additional space and can flexibly adapt to a compact internal layout. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments 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 charging device provided in an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of the charging equipment;

[0018] Figure 3 for Figure 2 A cross-sectional structural diagram of the charging equipment;

[0019] Figure 4 for Figure 2 Exploded view of the shielding component and pin module;

[0020] Figure 5 for Figure 1 Schematic diagram of the middle pin module;

[0021] Figure 6 for Figure 5 A schematic diagram of the exploded structure of the installed components;

[0022] Figure 7 for Figure 4 A schematic diagram of the structure in which the shielding component is located on the mounting assembly;

[0023] Figure 8 for Figure 5 A schematic diagram of the middle pin module without the mounting base;

[0024] Figure 9 for Figure 1 Schematic diagram of the main shell structure;

[0025] Figure 10 for Figure 9 Another structural schematic diagram of the main shell.

[0026] [Explanation of Key Figure Markings]

[0027] 1: Charging device; 10: Main housing; 101: Receiving cavity; 102: Bottom housing; 103: Side housing; 1031: Pin storage slot; 1032: Shaft slot; 1033: Pin positioning slot; 104: Top housing; 105: Stop part; 106: Positioning slot; 107: Support rib; 108: Stud; 20: Pin module; 21: Pin component; 211: Pin; 2112: Electrical connection part; 212: Shaft; 213: Positioning part; 22: Mounting component; 221: Mounting surface; 2 22: Mounting part; 223: Positioning seat; 2232: Stop groove; 2233: Positioning protrusion; 2234: Rotary shaft receiving groove; 2235: Screw hole; 224: Mounting seat; 23: Conductive spring; 231: First spring; 2311: First connecting end; 232: Second spring; 2321: Second connecting end; 24: Second wire; 25: First wire; 30: Charging module; 301: Transformer; 40: Shielding component; 401: Metal shielding layer; 402: First insulating layer. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments described in this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In this embodiment of the invention, the use of terms such as "first" and "second" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0030] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown in the figure, this utility model embodiment provides a charging device 1, which can be, for example, a charger with folding plugs 211. The charger power can be, for example, 45W or 100W. The plugs 211 have a retracted state and an extended state. This embodiment is described using a 45W folding plug charger 211. The charging device 1 includes: a main housing 10, a plug module 20, a charging module 30, and a shielding member 40.

[0031] The main housing 10 is provided with a receiving cavity 101; the plug module 20 includes a plug member 21 and a mounting assembly 22, the mounting assembly 22 is connected to the main housing 10 within the receiving cavity 101, and the plug member 21 is rotatably disposed between the main housing 10 and the mounting assembly 22; the charging module 30 is disposed within the receiving cavity 101, the charging module 30 is located on the side of the mounting assembly 22 opposite to the plug member 21, and is electrically connected to the plug module 20; the shielding member 40 is disposed between the mounting assembly 22 and the charging module 30.

[0032] The charging module 30 includes, for example, a transformer 301 and a switching element. The charging module 30 and the plug module 20 are arranged adjacent to each other along the height direction of the main housing 10. The transformer 301 and the mounting component 22 in the charging module 30 can be arranged adjacent to each other, for example. The shield 40 can be located in the gap between the transformer 301 and the mounting component 22, without occupying additional space, thus indirectly increasing the creepage distance.

[0033] When a charger is plugged into a socket, it may generate EMC interference to the mains power. This EMC interference is mainly conducted interference (i.e., interference energy is directly coupled to the mains network through the power line). Conducted interference can be divided into two categories: harmonic current interference and high-frequency noise interference.

[0034] (1) Harmonic current interference: Chargers typically use switching power supplies, such as AC-DC (Alternating Current to Direct Current) adapters. Their rectifier bridge converts the mains power (50 / 60Hz sine wave) into high-frequency DC (e.g., 200kHz~2MHz), and then outputs low-voltage DC through a filter circuit. Since the rectifier diodes are nonlinear components, the input current will exhibit pulse-like distortion (non-sine wave) and contain a large number of harmonic components. These harmonic currents will flow back into the mains power through the power line, causing distortion of the mains current waveform, which may interfere with the normal operation of other devices (such as motors and sensors) on the same power grid (e.g., causing motor overheating and instrument measurement errors).

[0035] (2) High-frequency noise interference: The high-frequency switching action of the switching power supply, such as the turn-on / turn-off of the MOSFET (metal-oxide-semiconductor FET), will generate high-frequency voltage spikes and high-frequency current oscillations on the primary side. This high-frequency noise can be conducted to the mains power through the input line, manifesting as high-frequency glitches, spikes, or noise on the mains voltage (frequency is usually between 10kHz and 30MHz). This noise may couple to other devices on the same power grid (such as audio equipment and cameras), causing noise interference (such as current noise and screen snow).

[0036] When the charger is operating, both types of conducted interference may coexist. Therefore, this application incorporates a shield 40 located between the plug module 20 and the charging module 30. This shield isolates high-frequency noise interference and harmonic current interference generated by the transformer 301, switching elements, etc., within the charging module 30, effectively reducing electromagnetic compatibility (EMC) interference to the mains power during operation and facilitating compliance with safety regulations. Furthermore, the shield 40 requires minimal additional space, allowing for flexible adaptation to compact internal layouts without compromising the product's miniaturization design goals.

[0037] Reference Figure 2 , Figure 4 and Figure 7As shown in the embodiment of this utility model, the mounting component 22 has a mounting surface 221 on the side opposite to the plug component 21, and the shielding component 40 is disposed on the mounting surface 221. Disposing the shielding component 40 on the mounting surface 221 allows it to be precisely positioned at the core isolation point between the plug module 20 and the charging module 30, ensuring accurate shielding positioning and no attenuation of shielding effect during long-term use. This eliminates the need for additional fixing brackets, saving internal space. Simultaneously, it effectively blocks high-frequency noise interference and harmonic current interference generated by the transformer 301, switching elements, etc., in the charging module 30, effectively reducing electromagnetic compatibility (EMC) interference to the mains power during operation of the charging device 1.

[0038] Reference Figure 2 , Figure 3 and Figure 4 As shown, in an embodiment of this utility model, the charging module 30 includes a transformer 301, and the shielding component 40 is disposed between the transformer 301 and the mounting assembly 22. The shielding component 40 includes a metal shielding layer 401 and a first insulating layer 402, with the first insulating layer 402 located on the side of the metal shielding layer 401 facing the transformer 301.

[0039] The shielding component 40 has a first insulating layer 402 on the side facing the transformer 301. This layer serves as an additional insulating medium, filling the gap between the transformer 301 and the mounting assembly 22. This effectively extends the path that current might creep along the surface, meeting the safety regulations' limits on creepage distance between high-voltage components and preventing leakage risks due to insufficient spacing. Furthermore, the integrated design of the first insulating layer 402 in the shielding component 40 allows for an indirect increase in creepage distance through the thickness and extended coverage of the first insulating layer 402, without requiring additional space, thus meeting the requirements for product miniaturization.

[0040] In an embodiment of this utility model, a second insulating layer is provided on the side of the metal shielding layer 401 facing the mounting assembly 22. Insulating layers are provided on both opposite sides of the metal shielding layer 401, effectively isolating the metal from high and low voltage components, meeting safety insulation requirements, and preventing leakage and breakdown.

[0041] In an embodiment of this invention, an adhesive layer is provided on the side of the second insulating layer facing the mounting assembly 22, and the second insulating layer is connected to the mounting surface 221 through the adhesive layer. The second insulating layer can be pre-fixed to the mounting assembly 22 via the adhesive layer before the next installation step, effectively improving overall assembly efficiency.

[0042] In an embodiment of this utility model, the area of ​​the shielding member 40 is greater than or equal to the area of ​​the mounting surface 221. The shielding member 40, with an area larger than the mounting surface 221, can extend towards the edge region of the pin module 20, forming a semi-enclosed shield against interference sources from the pin module 20, preventing interference from radiating from the gaps at the edge of the mounting surface 221 to the charging module 30.

[0043] In an embodiment of this invention, the area of ​​the first insulating layer 402 is larger than the area of ​​the metal shielding layer 401. The larger area of ​​the first insulating layer 402 allows it to completely cover the edges and surrounding area of ​​the metal shielding layer 401, forming a shielding structure without exposure, blocking interference diffraction channels, avoiding shielding dead zones, and further improving EMC (electromagnetic compatibility) performance.

[0044] In this embodiment of the invention, the metal shielding layer 401 is fixed between the first insulating layer 402 and the second insulating layer by adhesive. The metal shielding layer 401 is a copper sheet, while the first insulating layer 402 and the second insulating layer are both plastic sheets. The metal shielding layer 401 is fixed between the first insulating layer 402 and the second insulating layer by adhesive, forming an integrated composite structure. This prevents separation and displacement of the layers, ensuring the overall stability of the shielding component 40 and adapting to long-term use within the compact space of the charging device 1. Copper has extremely high conductivity, which can absorb and reflect high-frequency interference, blocking bidirectional interference between the charging module 30 and the plug module 20, thus improving EMC (electromagnetic compatibility) performance. Furthermore, copper foil is flexible and easily shaped, adapting to compact and irregular spaces without interference dead zones.

[0045] Reference Figure 1 , Figure 3 , Figure 9 and Figure 10 As shown, the main housing 10 includes a bottom shell 102, a top shell 104, and a side shell 103 connecting the bottom shell 102 and the top shell 104. The bottom shell 102 and the side shell 103 are integrally formed. The mounting assembly 22 and the pin 21 are disposed on the side shell 103. The side shell 103 is provided with a mounting structure, and the mounting assembly 22 and the pin 21 are disposed on the side shell 103 through the mounting structure, so that the pin 21 is located between the mounting assembly 22 and the main housing 10, and the pin 21 is rotatably connected to the main housing 10. The pin 21 includes a pin 211. The housing part corresponding to the pin 211 does not need to be disassembled. The integrally formed bottom shell 102 and side shell 103 have no splicing gaps, which effectively improves the overall structural strength and provides more stable support for the pin module 20.

[0046] Reference Figure 6 and Figure 8As shown in the embodiment of this utility model, the mounting assembly 22 has a mounting portion 222 on the side opposite to the bottom shell 102, and the mounting portion 222 extends from the mounting assembly 22 toward the pin 211; the pin module 20 includes a conductive spring 23 disposed within the mounting assembly 22, the conductive spring 23 including a first spring 231 and a second spring 232, the first spring 231 and the second spring 232 being spaced apart, the first spring 231 including a first connecting end 2311, the second spring 232 including a second connecting end 2321, the first connecting end 2311 and the second connecting end 2321 extending toward the side of the mounting portion 222. The spaced arrangement of the first spring 231 and the second spring 232 can, for example, ensure that the distance between them is greater than 3mm to meet safety requirements.

[0047] Specifically, refer to Figure 5 and Figure 6 As shown, the mounting assembly 22 includes a positioning seat 223 and a mounting seat 224. The pin 21 is rotatably connected to the positioning seat 223, and the mounting seat 224 is located on the side of the positioning seat 223 away from the pin 21. Exemplarily, the positioning seat 223 and the mounting seat 224 can be fixedly connected, for example, by means of a positioning post and a positioning hole. A conductive spring 23 is sandwiched between the positioning seat 223 and the mounting seat 224 and is fixed to the positioning seat 223.

[0048] Reference Figure 3 , Figure 5 and Figure 6 As shown, the plug component 21 includes two plugs 211, a positioning part 213, and a rotating shaft 212, and an electrical contact part 2112 provided on the plugs 211. The positioning seat 223 has a rotating shaft receiving groove 2234 on the side away from the mounting seat 224. When the plug component 21 and the mounting assembly 22 are mounted on the main housing 10, the rotating shaft 212 is located in the rotating shaft receiving groove 2234, so that the plug component 21 is rotatably connected between the main housing 10 and the mounting assembly 22.

[0049] The plug module 20 includes a second wire 24 and a first wire 25. The first wire 25 can be connected to the first connection end 2311 of the first spring contact 231, and the second wire 24 can be connected to the second connection end 2321 of the second spring contact 232. The wiring positions are all located on the side of the mounting assembly 22 away from the bottom shell 102, which facilitates placing the plug module 20 into the receiving cavity 101 before wiring. At the same time, the design of the mounting part 222 isolates the second wire 24 and the first wire 25 from direct contact with other components in the mounting assembly 22 during wiring, preventing sparks from other components, reducing safety hazards such as short circuits and leakage, and improving the safety of the charging device 1.

[0050] Reference Figure 3 , Figure 9 and Figure 10 As shown in the embodiment of this utility model, the inner wall of the main housing 10 is provided with two pin receiving slots 1031, which are spaced apart along the thickness direction of the main housing 10 and extend along the circumferential direction of the main housing 10; the inner wall of the main housing 10 is provided with a pivot groove 1032, which is located between the two pin receiving slots 1031 and is perpendicular to the two pin receiving slots 1031; the main housing 10 is provided with a pin positioning groove 1033, which is located between the pin receiving slot 1031 and the pivot groove 1032; the pin component 21 is located in the pin receiving slot 1031, the pivot groove 1032 and the pin positioning groove 1033. The pin storage groove 1031, the pivot groove 1032 and the pin positioning groove 1033 can be provided on the side shell 103, for example, to realize the connection between the pin 21 and the main shell 10.

[0051] Reference Figure 3 , Figure 6 , Figure 8 , Figure 9 and Figure 10 As shown, in an embodiment of this utility model, one end of the mounting component 22 is provided with a stop groove 2232, and the other end of the mounting component 22 is provided with a screw hole 2235. The mounting component 22 is provided with a shaft receiving groove 2234 corresponding to the shaft 212 of the pin module 20, and the shaft receiving groove 2234 is located between the stop groove 2232 and the screw hole 2235. The inner wall of the main housing 10 is provided with a stop part 105 and a stud 108 corresponding to the stop groove 2232 and the screw hole 2235, respectively. When the mounting component 22 is connected to the main housing 10, the stop part 105 is engaged with the stop groove 2232, and the screw hole 2235 is fixedly connected to the stud 108 by screws.

[0052] When the mounting component 22 is located within the receiving cavity 101, the stop portion 105 and the stop groove 2232 are snapped together, thus fixing the mounting component 22 to the side shell 103. This provides a clear positioning reference for the installation of the mounting component 22 on the side shell 103, ensuring quick and accurate alignment of the mounting component 22 and preventing misalignment during assembly. Secondly, the bottom shell 102 has multiple support ribs 107 on the side near the side shell 103. These support ribs 107 are spaced apart and extend away from the bottom shell 102. When the mounting component 22 is fixed within the receiving cavity 101, the multiple support ribs 107 abut against the mounting component 22, providing auxiliary support and preventing the stop portion 105 and the stop groove 2232 from detaching. The screw hole 2235 can be provided on the positioning seat 223, for example, and the stud 108 can be provided on the bottom shell 102, for example. The fixed connection between the screw hole 2235 and the stud 108 further provides fixed support for the mounting assembly 22, and avoids situations such as the stop part 105 and the stop groove 2232 snapping off.

[0053] Reference Figure 3 , Figure 6 , Figure 8 , Figure 9 and Figure 10 As shown, in an embodiment of this utility model, the mounting component 22 is provided with a positioning protrusion 2233 on the side away from the shield 40, and the positioning protrusion 2233 is located near the end of the mounting component 22 where the stop groove 2232 is provided; the inner wall of the main housing 10 is provided with a positioning groove 106, and when the mounting component 22 is connected to the main housing 10, the positioning protrusion 2233 is limitedly connected to the positioning groove 106.

[0054] The positioning protrusion 2233 may be provided, for example, on the positioning seat 223, and the positioning groove 106 may be provided, for example, on the inner wall of the side shell 103. The positioning protrusion 2233 of the positioning seat 223 and the positioning groove 106 on the inner wall of the side shell 103 form a limiting fit, restricting the displacement of the mounting assembly 22 in the main housing 10, and further providing a clear positioning reference for the installation of the mounting assembly 22 in the side shell 103.

[0055] Furthermore, it is understood that the foregoing embodiments are merely illustrative examples of this utility model. Provided that the technical features do not conflict, the structure is not contradictory, and the purpose of this utility model is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not 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.

Claims

1. A charging device (1), characterized in that, include: The main housing (10) is provided with a receiving cavity (101); The pin module (20) includes a pin (21) and a mounting assembly (22), wherein the mounting assembly (22) is connected to the main housing (10) within the receiving cavity (101), and the pin (21) is rotatably disposed between the main housing (10) and the mounting assembly (22); A charging module (30) is disposed in the receiving cavity (101). The charging module (30) is located on the side of the mounting assembly (22) away from the pin (21) and is electrically connected to the pin module (20). A shielding element (40) is disposed between the mounting assembly (22) and the charging module (30).

2. The charging device (1) according to claim 1, characterized in that, The mounting component (22) has a mounting surface (221) on the side opposite to the pin (21), and the shield (40) is provided on the mounting surface (221).

3. The charging device (1) according to claim 2, characterized in that, The charging module (30) includes a transformer (301), and the shield (40) is disposed between the transformer (301) and the mounting assembly (22). The shield (40) includes a metal shield (401) and a first insulating layer (402), and the first insulating layer (402) is located on the side of the metal shield (401) facing the transformer (301).

4. The charging device (1) according to claim 3, characterized in that, The metal shielding layer (401) has a second insulating layer on the side facing the mounting assembly (22).

5. The charging device (1) according to claim 4, characterized in that, The second insulating layer has an adhesive layer on the side facing the mounting assembly (22), and the second insulating layer is connected to the mounting surface (221) through the adhesive layer.

6. The charging device (1) according to claim 2, characterized in that, The area of ​​the shield (40) is greater than or equal to the area of ​​the mounting surface (221).

7. The charging device (1) according to claim 3, characterized in that, The area of ​​the first insulating layer (402) is larger than the area of ​​the metal shielding layer (401).

8. The charging device (1) according to claim 4, characterized in that, The metal shielding layer (401) is fixed between the first insulating layer (402) and the second insulating layer by adhesive. The metal shielding layer (401) is a copper sheet, and the first insulating layer (402) and the second insulating layer are both plastic sheets.

9. The charging device (1) according to any one of claims 1-8, characterized in that, One end of the mounting component (22) is provided with a stop groove (2232), and the other end of the mounting component (22) is provided with a screw hole (2235). The mounting component (22) is provided with a shaft receiving groove (2234) corresponding to the shaft (212) of the pin module (20). The shaft receiving groove (2234) is located between the stop groove (2232) and the screw hole (2235). The inner wall of the main housing (10) is provided with a stop part (105) and a stud (108) corresponding to the stop groove (2232) and the screw hole (2235). When the mounting assembly (22) is connected to the main housing (10), the stop part (105) is engaged with the stop groove (2232), and the screw hole (2235) is fixedly connected with the stud (108) by screws.

10. The charging device (1) according to claim 9, characterized in that, The mounting assembly (22) has a positioning protrusion (2233) on the side away from the shield (40), and the positioning protrusion (2233) is located near the end of the mounting assembly (22) where the stop groove (2232) is located; The inner wall of the main housing (10) is provided with a positioning groove (106). When the mounting assembly (22) is connected to the main housing (10), the positioning protrusion (2233) is limited to the positioning groove (106).

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