contactor

Abstract

The application discloses a contactor, comprising: an outer insulating shell with a top opening; an insulating top cover covering the top opening of the outer insulating shell; an inner insulating shell arranged in the outer insulating shell for defining an arc-extinguishing chamber; a movable contact head movably arranged in the arc-extinguishing chamber; a first stationary contact head fixed to the inner insulating shell; and a second stationary contact head fixed to the inner insulating shell. One end of the first stationary contact head and the second stationary contact head extends into the arc-extinguishing chamber for electrically contacting with the movable contact head; at least one of the first stationary contact head and the second stationary contact head has a flat welding end extending from the insulating top cover, which is used for welding to a circuit board to be electrically connected with the circuit board. The contactor of the application is suitable for being directly welded to the circuit board, which is beneficial to saving customer installation time, improving installation efficiency and reducing installation space of the contactor.

Description

Technical Field

[0001] This invention relates to a contactor, and more particularly to a contactor suitable for soldering onto a circuit board. Background Technology

[0002] In existing technologies, DC contactors play a crucial role in new energy vehicles and their charging equipment. They are widely used in charging piles and electric vehicles to ensure safe current transmission and stable system operation. In charging pile applications, DC contactors are installed on the DC output side of DC charging piles, charging stations, or the output side of on-board chargers. When the contactor is closed, it connects the charging pile to the vehicle, enabling power transmission; when open, it isolates the charging pile from external connections, providing safety protection. In electric vehicle applications, DC contactors are typically configured between the battery system and the inverter. When the system is running, it connects the power supply terminal to the load terminal, ensuring smooth current transmission; when the system stops operating or a fault occurs, it can quickly disconnect the circuit, safely separating the energy storage system from the vehicle's electrical system. Furthermore, DC contactors also serve as important electrical control devices in other auxiliary circuits of electric vehicles. In existing technologies, coils and auxiliary contacts generally use wires or connectors as leads, while main contacts generally use internal threads or external studs as leads. Therefore, existing contactors are not suitable for direct soldering onto circuit boards and require adapter terminals or adapter connectors to connect to the circuit boards. This increases the manufacturing cost of the contactors, reduces their installation efficiency, and increases the installation space required for the contactors. Summary of the Invention

[0003] The purpose of this invention is to solve at least one aspect of the aforementioned problems and defects existing in the prior art.

[0004] According to one aspect of the present invention, a contactor is provided. The contactor includes: an outer insulating shell having a top opening; an insulating top cover sealing the top opening of the outer insulating shell; an inner insulating shell disposed within the outer insulating shell for defining an arc-extinguishing chamber; a moving contact movably disposed within the arc-extinguishing chamber; a first stationary contact fixed to the inner insulating shell; and a second stationary contact fixed to the inner insulating shell. One end of the first stationary contact and the second stationary contact extends into the arc-extinguishing chamber for electrical contact with the moving contact; at least one of the first stationary contact and the second stationary contact has a flat welded end extending from the insulating top cover, the flat welded end being used for welding to a circuit board for electrical connection with the circuit board.

[0005] According to an exemplary embodiment of the present invention, the first stationary contact includes: a terminal body, which is columnar and fixed to the inner insulating shell; and a connecting terminal, which is L-shaped and includes a horizontal plate and a vertical plate connected vertically. The lower end of the terminal body extends into the arc-extinguishing chamber for electrical contact with the moving contact, the top of the terminal body is located outside the inner insulating shell, the horizontal plate of the connecting terminal is fixed to the top of the terminal body, and the vertical plate of the connecting terminal extends from the insulating top cover and serves as a flat solder end for soldering to the circuit board.

[0006] According to another exemplary embodiment of the present invention, a threaded hole is formed on the top of the terminal body, and a connection hole corresponding to the threaded hole is formed on the horizontal plate of the connecting terminal; the first stationary contact further includes a bolt, which passes through the connection hole on the horizontal plate of the connecting terminal and is threaded into the threaded hole of the terminal body to fasten the connecting terminal to the top of the terminal body.

[0007] According to another exemplary embodiment of the present invention, the first stationary contact further includes an anti-loosening washer, which is clamped between the operating head of the bolt and the horizontal plate of the connecting terminal to prevent the bolt from loosening.

[0008] According to another exemplary embodiment of the present invention, a riveting hole is formed on the horizontal plate of the connecting terminal, and a riveting post is formed on the top of the terminal body. The riveting post is riveted into the riveting hole to rivet the connecting terminal to the top of the terminal body.

[0009] According to another exemplary embodiment of the present invention, the horizontal plate of the connecting terminal is welded to the top of the terminal body to secure the connecting terminal to the top of the terminal body.

[0010] According to another exemplary embodiment of the present invention, the terminal body shown is a one-piece machined part, and the connecting terminal is a one-piece stamped part.

[0011] According to another exemplary embodiment of the present invention, the second stationary contact includes: a columnar terminal fixed to the inner insulating shell, the lower end of the columnar terminal extending into the arc-extinguishing chamber for electrical contact with the moving contact, and the upper end of the columnar terminal extending from the insulating top cover for electrical connection to the circuit board or busbar.

[0012] According to another exemplary embodiment of the present invention, a threaded connection hole suitable for connection with a threaded fastener is formed on the top of the columnar terminal, so that the columnar terminal can be fastened to the circuit board or busbar by the threaded fastener.

[0013] According to another exemplary embodiment of the present invention, the inner insulating shell is a ceramic part, and the terminal body and the columnar terminal are welded to the inner insulating shell by a brazing process.

[0014] According to another exemplary embodiment of the present invention, the columnar terminal is a one-piece machined part.

[0015] According to another exemplary embodiment of the present invention, the second stationary contact is exactly the same as the first stationary contact, such that the first stationary contact and the second stationary contact can be used interchangeably.

[0016] According to another exemplary embodiment of the present invention, the first stationary contact includes: a first stationary terminal fixed to the inner insulating shell, the lower end of the first stationary terminal extending into the arc-extinguishing chamber for electrical contact with the moving contact, the top of the first stationary terminal located outside the inner insulating shell, the first stationary terminal having a first flat upper end, the first flat upper end of the first stationary terminal extending from the insulating top cover for use as a flat solder end for soldering to the circuit board.

[0017] According to another exemplary embodiment of the present invention, the second stationary contact includes: a second stationary terminal fixed to the inner insulating shell, the lower end of the second stationary terminal extending into the arc-extinguishing chamber for electrical contact with the moving contact, the top of the second stationary terminal located outside the inner insulating shell, the second stationary terminal having a second flat upper end, the second flat upper end of the second stationary terminal extending from the insulating top cover for soldering to the circuit board.

[0018] According to another exemplary embodiment of the present invention, the first stationary terminal and the second stationary terminal are both integrally machined terminals.

[0019] According to another exemplary embodiment of the present invention, the second stationary contact is exactly the same as the first stationary contact, such that the first stationary contact and the second stationary contact can be used interchangeably.

[0020] According to another exemplary embodiment of the present invention, the contactor further includes: a pair of auxiliary contacts disposed in the arc-extinguishing chamber for detecting whether the moving contact has been moved to a closed position for electrical contact with the first and second stationary contacts; and a pair of auxiliary terminals fixed to the insulating top cover and electrically connected to the pair of auxiliary contacts respectively, the auxiliary terminals being flat and extending from the insulating top cover for soldering to the circuit board.

[0021] According to another exemplary embodiment of the present invention, the auxiliary contact has a lead end extending from the inner insulating shell, and the auxiliary terminal is electrically connected to the lead end of the auxiliary contact via a wire to be electrically connected to the auxiliary contact.

[0022] According to another exemplary embodiment of the present invention, the contactor further includes: a magnetic cylinder disposed in the outer insulating shell and located below the inner insulating shell; and a coil assembly disposed in the magnetic cylinder, including a coil frame and a coil wound on the coil frame, the two terminals of the coil passing through the inner insulating shell and extending from the insulating top cover for soldering to the circuit board.

[0023] According to another exemplary embodiment of the present invention, the contactor further includes: a plurality of mounting terminals fixed to the outer side of the peripheral wall of the top of the outer insulating shell, the mounting terminals being flat and for soldering to the circuit board to fix the outer insulating shell to the circuit board.

[0024] According to another exemplary embodiment of the present invention, a plurality of connecting ears are formed on the outer side of the peripheral wall at the top of the outer insulating shell, and the plurality of mounting terminals are respectively fixed to the plurality of connecting ears; the outer insulating shell is injection molded onto the plurality of mounting terminals, such that the outer insulating shell and the plurality of mounting terminals become a single piece.

[0025] According to another exemplary embodiment of the present invention, a plurality of connecting lugs are formed on the outer side of the peripheral wall at the top of the outer insulating shell, and through holes are formed on the connecting lugs to allow threaded fasteners to pass through, so that the outer insulating shell can be fastened to the circuit board by threaded fasteners.

[0026] In the foregoing exemplary embodiments of the present invention, the stationary contact of the contactor is suitable for direct soldering onto the circuit board, which helps to save customer installation time, improve installation efficiency, and reduce the installation space of the contactor.

[0027] Other objects and advantages of the invention will become apparent from the following description of the invention with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the invention. Attached Figure Description

[0028] Figure 1 A perspective view of a contactor according to an exemplary first embodiment of the present invention is shown;

[0029] Figure 2 A longitudinal sectional view of a contactor according to an exemplary first embodiment of the present invention is shown;

[0030] Figure 3 A perspective view of a contactor according to an exemplary first embodiment of the present invention is shown, wherein the outer insulating shell and the insulating top cover are removed;

[0031] Figure 4An exploded view of a contactor according to an exemplary first embodiment of the present invention is shown, wherein the outer insulating shell and the insulating top cover are removed;

[0032] Figure 5 A cross-sectional view of the first stationary contact of a contactor according to an exemplary first embodiment of the present invention is shown;

[0033] Figure 6 An exploded schematic diagram of the first stationary contact of a contactor according to an exemplary first embodiment of the present invention is shown;

[0034] Figure 7 A perspective view of a contactor according to an exemplary second embodiment of the present invention is shown;

[0035] Figure 8 A longitudinal sectional view of a contactor according to an exemplary second embodiment of the present invention is shown;

[0036] Figure 9 A perspective view of a contactor according to an exemplary second embodiment of the present invention is shown, wherein the outer insulating shell and the insulating top cover are removed;

[0037] Figure 10 An exploded view of a contactor according to an exemplary second embodiment of the present invention is shown, wherein the outer insulating shell and the insulating top cover are removed;

[0038] Figure 11 A cross-sectional view of the first stationary contact of a contactor according to an exemplary second embodiment of the present invention is shown;

[0039] Figure 12 An exploded schematic diagram of the first stationary contact of a contactor according to an exemplary second embodiment of the present invention is shown;

[0040] Figure 13 A perspective view of a contactor according to an exemplary third embodiment of the present invention is shown;

[0041] Figure 14 A longitudinal sectional view of a contactor according to an exemplary third embodiment of the present invention is shown;

[0042] Figure 15 A perspective view of a contactor according to an exemplary third embodiment of the present invention is shown, wherein the outer insulating shell and the insulating top cover are removed;

[0043] Figure 16 An exploded view of a contactor according to an exemplary third embodiment of the present invention is shown, wherein the outer insulating shell and the insulating top cover are removed;

[0044] Figure 17Showing a cross-sectional view of the first stationary contact of a contactor according to an exemplary third embodiment of the present invention;

[0045] Figure 18 A perspective view of a contactor according to an exemplary fourth embodiment of the present invention is shown;

[0046] Figure 19 A longitudinal sectional view of a contactor according to an exemplary fourth embodiment of the present invention is shown;

[0047] Figure 20 A perspective view of a contactor according to an exemplary fourth embodiment of the present invention is shown, wherein the outer insulating shell and the insulating top cover are removed;

[0048] Figure 21 An exploded view of a contactor according to an exemplary fourth embodiment of the present invention is shown, wherein the outer insulating shell and the insulating top cover are removed;

[0049] Figure 22 This shows a cross-sectional view of the first stationary contact of a contactor according to an exemplary fourth embodiment of the present invention. Detailed Implementation

[0050] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation thereof.

[0051] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the figures.

[0052] According to a general technical concept of the present invention, a contactor is provided. The contactor includes: an outer insulating shell having a top opening; an insulating top cover sealing the top opening of the outer insulating shell; an inner insulating shell disposed within the outer insulating shell for defining an arc-extinguishing chamber; a moving contact movably disposed within the arc-extinguishing chamber; a first stationary contact fixed to the inner insulating shell; and a second stationary contact fixed to the inner insulating shell. One end of the first stationary contact and the second stationary contact extends into the arc-extinguishing chamber for electrical contact with the moving contact; at least one of the first stationary contact and the second stationary contact has a flat welded end extending from the insulating top cover, the flat welded end being used for welding to a circuit board for electrical connection with the circuit board.

[0053] First Embodiment

[0054] Figures 1 to 6 This illustrates a first embodiment of the invention. Figure 1 A perspective view of a contactor according to an exemplary first embodiment of the present invention is shown; Figure 2 A longitudinal sectional view of a contactor according to an exemplary first embodiment of the present invention is shown; Figure 3 A perspective view of a contactor according to an exemplary first embodiment of the present invention is shown, wherein the outer insulating shell 60 and the insulating top cover 61 are removed; Figure 4 An exploded view of a contactor according to an exemplary first embodiment of the present invention is shown, wherein the outer insulating shell 60 and the insulating top cover 61 are removed; Figure 5 This shows a cross-sectional view of the first stationary contact 1 of a contactor according to an exemplary first embodiment of the present invention; Figure 6 An exploded schematic diagram of the first stationary contact 1 of a contactor according to an exemplary first embodiment of the present invention is shown.

[0055] like Figures 1 to 6 As shown, in an exemplary embodiment of the present invention, a contactor is disclosed. The contactor includes: an outer insulating shell 60, an insulating top cover 61, an inner insulating shell 7, a moving contact 3, a first stationary contact 1, and a second stationary contact 2. The outer insulating shell 60 has a top opening. The insulating top cover 61 covers the top opening of the outer insulating shell 60. The inner insulating shell 7 is disposed within the outer insulating shell 60 and defines an arc-extinguishing chamber 70. The moving contact 3 is movably disposed within the arc-extinguishing chamber 70. The first stationary contact 1 is fixed to the inner insulating shell 7. The second stationary contact 2 is fixed to the inner insulating shell 7. One end of the first stationary contact 1 and the second stationary contact 2 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3. At least one of the first stationary contact 1 and the second stationary contact 2 has a flat solder end 1a extending from the insulating top cover 61, which is used for soldering to a circuit board (not shown) for electrical connection to the circuit board. For example, a slot is formed on the circuit board for the flat solder end 1a, which can be inserted into the slot on the circuit board and soldered to the circuit board.

[0056] like Figures 1 to 6As shown in the illustrated embodiment, the first stationary contact 1 includes a terminal body 10 and a connecting terminal 11. The terminal body 10 is cylindrical and fixed to the inner insulating shell 7. The connecting terminal 11 is L-shaped and includes a horizontal plate 111 and a vertical plate 112 connected vertically. The lower end of the terminal body 10 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3, and the top of the terminal body 10 is located outside the inner insulating shell 7. The horizontal plate 111 of the connecting terminal 11 is fixed to the top of the terminal body 10, and the vertical plate 112 of the connecting terminal 11 extends from the insulating top cover 61 and serves as a flat solder end 1a for soldering to a circuit board.

[0057] like Figures 1 to 6 As shown in the illustrated embodiment, a threaded hole 10c is formed on the top of the terminal body 10, and a connecting hole 11c corresponding to the threaded hole 10c is formed on the horizontal plate 111 of the connecting terminal 11. The first stationary contact 1 also includes a bolt 12, which passes through the connecting hole 11c on the horizontal plate 111 of the connecting terminal 11 and is threaded into the threaded hole 10c of the terminal body 10 to fasten the connecting terminal 11 to the top of the terminal body 10.

[0058] like Figures 1 to 6 As shown in the illustrated embodiment, the first stationary contact 1 further includes an anti-loosening washer 13, which is clamped between the operating head 121 of the bolt 12 and the horizontal plate 111 of the connecting terminal 11 to prevent the bolt 12 from loosening.

[0059] like Figures 1 to 6 As shown in the illustrated embodiment, the terminal body 10 is a one-piece machined part, and the connecting terminal 11 is a one-piece stamped part.

[0060] like Figures 1 to 6 As shown, in the illustrated embodiment, the second stationary contact 2 includes a columnar terminal 20, which is fixed to the inner insulating shell 7. The lower end of the columnar terminal 20 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3, and the upper end of the columnar terminal 20 extends from the insulating top cover 61 for electrical connection to a circuit board or busbar (not shown, e.g., copper busbar).

[0061] like Figures 1 to 6 As shown, in the illustrated embodiment, a threaded connection hole 2a suitable for connection with a threaded fastener (not shown, e.g., a bolt) is formed on the top of the columnar terminal 20, so that the columnar terminal 20 can be fastened to a circuit board or busbar by the threaded fastener.

[0062] like Figures 1 to 6 As shown, in the illustrated embodiment, the inner insulating shell 7 is typically a ceramic component, and the terminal body 10 and the columnar terminal 20 are typically brazed to the inner insulating shell 7.

[0063] like Figures 1 to 6 As shown in the illustrated embodiment, the columnar terminal 20 is a one-piece machined part.

[0064] However, please note that the second stationary contact 2 of the present invention is not limited to the illustrated embodiment. For example, in another exemplary embodiment of the present invention, the second stationary contact 2 may be exactly the same as the first stationary contact 1, so that the first stationary contact 1 and the second stationary contact 2 can be used interchangeably.

[0065] like Figures 1 to 6 As shown in the illustrated embodiment, the contactor further includes a pair of auxiliary contacts (not shown) and a pair of auxiliary terminals 4. The pair of auxiliary contacts are disposed in the arc-extinguishing chamber 70 and are used to detect whether the moving contact 3 has been moved to a closed position where it is in electrical contact with the first and second stationary contacts 1 and 2. The pair of auxiliary terminals 4 are fixed to the insulating top cover 61 and are electrically connected to the pair of auxiliary contacts respectively. The auxiliary terminals 4 are flat and extend from the insulating top cover 61 for soldering to a circuit board.

[0066] like Figures 1 to 6 As shown, in the illustrated embodiment, the auxiliary contact has a lead end 41 extending from the inner insulating shell 7, and the auxiliary terminal 4 is electrically connected to the lead end 41 of the auxiliary contact via a wire 42 for electrical connection with the auxiliary contact.

[0067] like Figures 1 to 6 As shown in the illustrated embodiment, the contactor further includes a magnetic cylinder 8 and a coil assembly. The magnetic cylinder 8 is disposed within the outer insulating shell 60 and located below the inner insulating shell 7. The coil assembly is disposed within the magnetic cylinder 8 and includes a coil frame 51 and a coil 50 wound on the coil frame 51. The two terminals 5 of the coil 50 pass through the inner insulating shell 7 and extend from the insulating top cover 61 for soldering to a circuit board.

[0068] like Figures 1 to 6 As shown in the illustrated embodiment, the contactor further includes a plurality of mounting terminals 63, which are fixed to the outer side of the peripheral wall of the top of the outer insulating housing 60. The mounting terminals 63 are flat and designed for soldering to a circuit board to secure the outer insulating housing 60 to the circuit board.

[0069] like Figures 1 to 6 As shown in the illustrated embodiment, a plurality of connecting ears 62 are formed on the outer side of the peripheral wall at the top of the outer insulating shell 60, and a plurality of mounting terminals 63 are respectively fixed to the plurality of connecting ears 62. The outer insulating shell 60 is injection molded onto the plurality of mounting terminals 63, so that the outer insulating shell 60 and the plurality of mounting terminals 63 become a single piece.

[0070] However, the present invention is not limited to the illustrated embodiments. For example, in another exemplary embodiment of the present invention, a plurality of connecting ears 62 are formed on the outer side of the peripheral wall at the top of the outer insulating shell 60, and through holes are formed on the connecting ears 62 to allow threaded fasteners to pass through, so that the outer insulating shell 60 can be fastened to the circuit board by threaded fasteners.

[0071] Second Embodiment

[0072] Figures 7 to 12 This illustrates a second embodiment of the invention. Figure 7 A perspective view of a contactor according to an exemplary second embodiment of the present invention is shown; Figure 8 A longitudinal sectional view of a contactor according to an exemplary second embodiment of the present invention is shown; Figure 9 A perspective view of a contactor according to an exemplary second embodiment of the present invention is shown, wherein the outer insulating shell 60 and the insulating top cover 61 are removed; Figure 10 An exploded view of a contactor according to an exemplary second embodiment of the present invention is shown, wherein the outer insulating shell 60 and the insulating top cover 61 are removed; Figure 11 This shows a cross-sectional view of the first stationary contact 1 of a contactor according to an exemplary second embodiment of the present invention; Figure 12 An exploded schematic diagram of the first stationary contact 1 of a contactor according to an exemplary second embodiment of the present invention is shown.

[0073] like Figures 7 to 12 As shown, in an exemplary embodiment of the present invention, a contactor is disclosed. The contactor includes: an outer insulating shell 60, an insulating top cover 61, an inner insulating shell 7, a moving contact 3, a first stationary contact 1, and a second stationary contact 2. The outer insulating shell 60 has a top opening. The insulating top cover 61 covers the top opening of the outer insulating shell 60. The inner insulating shell 7 is disposed within the outer insulating shell 60 and defines an arc-extinguishing chamber 70. The moving contact 3 is movably disposed within the arc-extinguishing chamber 70. The first stationary contact 1 is fixed to the inner insulating shell 7. The second stationary contact 2 is fixed to the inner insulating shell 7. One end of the first stationary contact 1 and the second stationary contact 2 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3. At least one of the first stationary contact 1 and the second stationary contact 2 has a flat solder end 1a extending from the insulating top cover 61, which is used for soldering to a circuit board (not shown) for electrical connection to the circuit board. For example, a slot is formed on the circuit board for the flat solder end 1a, which can be inserted into the slot on the circuit board and soldered to the circuit board.

[0074] like Figures 7 to 12As shown in the illustrated embodiment, the first stationary contact 1 includes a terminal body 10 and a connecting terminal 11. The terminal body 10 is cylindrical and fixed to the inner insulating shell 7. The connecting terminal 11 is L-shaped and includes a horizontal plate 111 and a vertical plate 112 connected vertically. The lower end of the terminal body 10 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3, and the top of the terminal body 10 is located outside the inner insulating shell 7. The horizontal plate 111 of the connecting terminal 11 is fixed to the top of the terminal body 10, and the vertical plate 112 of the connecting terminal 11 extends from the insulating top cover 61 and serves as a flat solder end 1a for soldering to a circuit board.

[0075] like Figures 7 to 12 As shown in the illustrated embodiment, a riveting hole 11a is formed on the horizontal plate 111 of the connecting terminal 11, and a riveting post 10a is formed on the top of the terminal body 10. The riveting post 10a is riveted into the riveting hole 11a to rivet the connecting terminal 11 to the top of the terminal body 10.

[0076] like Figures 7 to 12 As shown in the illustrated embodiment, the terminal body 10 is a one-piece machined part, and the connecting terminal 11 is a one-piece stamped part.

[0077] like Figures 7 to 12 As shown, in the illustrated embodiment, the second stationary contact 2 includes a columnar terminal 20, which is fixed to the inner insulating shell 7. The lower end of the columnar terminal 20 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3, and the upper end of the columnar terminal 20 extends from the insulating top cover 61 for electrical connection to a circuit board or busbar (not shown, e.g., copper busbar).

[0078] like Figures 7 to 12 As shown, in the illustrated embodiment, a threaded connection hole 2a suitable for connection with a threaded fastener (not shown, e.g., a bolt) is formed on the top of the columnar terminal 20, so that the columnar terminal 20 can be fastened to a circuit board or busbar by the threaded fastener.

[0079] like Figures 7 to 12 As shown, in the illustrated embodiment, the inner insulating shell 7 is typically a ceramic component, and the terminal body 10 and the columnar terminal 20 are typically brazed to the inner insulating shell 7.

[0080] like Figures 7 to 12 As shown in the illustrated embodiment, the columnar terminal 20 is a one-piece machined part.

[0081] However, please note that the second stationary contact 2 of the present invention is not limited to the illustrated embodiment. For example, in another exemplary embodiment of the present invention, the second stationary contact 2 may be exactly the same as the first stationary contact 1, so that the first stationary contact 1 and the second stationary contact 2 can be used interchangeably.

[0082] like Figures 7 to 12 As shown in the illustrated embodiment, the contactor further includes a pair of auxiliary contacts (not shown) and a pair of auxiliary terminals 4. The pair of auxiliary contacts are disposed in the arc-extinguishing chamber 70 and are used to detect whether the moving contact 3 has been moved to a closed position where it is in electrical contact with the first and second stationary contacts 1 and 2. The pair of auxiliary terminals 4 are fixed to the insulating top cover 61 and are electrically connected to the pair of auxiliary contacts respectively. The auxiliary terminals 4 are flat and extend from the insulating top cover 61 for soldering to a circuit board.

[0083] like Figures 7 to 12 As shown, in the illustrated embodiment, the auxiliary contact has a lead end 41 extending from the inner insulating shell 7, and the auxiliary terminal 4 is electrically connected to the lead end 41 of the auxiliary contact via a wire 42 for electrical connection with the auxiliary contact.

[0084] like Figures 7 to 12 As shown in the illustrated embodiment, the contactor further includes a magnetic cylinder 8 and a coil assembly. The magnetic cylinder 8 is disposed within the outer insulating shell 60 and located below the inner insulating shell 7. The coil assembly is disposed within the magnetic cylinder 8 and includes a coil frame 51 and a coil 50 wound on the coil frame 51. The two terminals 5 of the coil 50 pass through the inner insulating shell 7 and extend from the insulating top cover 61 for soldering to a circuit board.

[0085] like Figures 7 to 12 As shown in the illustrated embodiment, the contactor further includes a plurality of mounting terminals 63, which are fixed to the outer side of the peripheral wall of the top of the outer insulating housing 60. The mounting terminals 63 are flat and designed for soldering to a circuit board to secure the outer insulating housing 60 to the circuit board.

[0086] like Figures 7 to 12 As shown in the illustrated embodiment, a plurality of connecting ears 62 are formed on the outer side of the peripheral wall at the top of the outer insulating shell 60, and a plurality of mounting terminals 63 are respectively fixed to the plurality of connecting ears 62. The outer insulating shell 60 is injection molded onto the plurality of mounting terminals 63, so that the outer insulating shell 60 and the plurality of mounting terminals 63 become a single piece.

[0087] However, the present invention is not limited to the illustrated embodiments. For example, in another exemplary embodiment of the present invention, a plurality of connecting ears 62 are formed on the outer side of the peripheral wall at the top of the outer insulating shell 60, and through holes are formed on the connecting ears 62 to allow threaded fasteners to pass through, so that the outer insulating shell 60 can be fastened to the circuit board by threaded fasteners.

[0088] Third Embodiment

[0089] Figures 13 to 17 This illustrates a third embodiment according to the present invention. Figure 13A perspective view of a contactor according to an exemplary third embodiment of the present invention is shown; Figure 14 A longitudinal sectional view of a contactor according to an exemplary third embodiment of the present invention is shown; Figure 15 A perspective view of a contactor according to an exemplary third embodiment of the present invention is shown, wherein the outer insulating shell 60 and the insulating top cover 61 are removed; Figure 16 An exploded view of a contactor according to an exemplary third embodiment of the present invention is shown, wherein the outer insulating shell 60 and the insulating top cover 61 are removed; Figure 17 This shows a cross-sectional view of the first stationary contact 1 of a contactor according to an exemplary third embodiment of the present invention.

[0090] like Figures 13 to 17 As shown, in an exemplary embodiment of the present invention, a contactor is disclosed. The contactor includes: an outer insulating shell 60, an insulating top cover 61, an inner insulating shell 7, a moving contact 3, a first stationary contact 1, and a second stationary contact 2. The outer insulating shell 60 has a top opening. The insulating top cover 61 covers the top opening of the outer insulating shell 60. The inner insulating shell 7 is disposed within the outer insulating shell 60 and defines an arc-extinguishing chamber 70. The moving contact 3 is movably disposed within the arc-extinguishing chamber 70. The first stationary contact 1 is fixed to the inner insulating shell 7. The second stationary contact 2 is fixed to the inner insulating shell 7. One end of the first stationary contact 1 and the second stationary contact 2 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3. At least one of the first stationary contact 1 and the second stationary contact 2 has a flat solder end 1a extending from the insulating top cover 61, which is used for soldering to a circuit board (not shown) for electrical connection to the circuit board. For example, a slot is formed on the circuit board for the flat solder end 1a, which can be inserted into the slot on the circuit board and soldered to the circuit board.

[0091] like Figures 13 to 17 As shown in the illustrated embodiment, the first stationary contact 1 includes a terminal body 10 and a connecting terminal 11. The terminal body 10 is cylindrical and fixed to the inner insulating shell 7. The connecting terminal 11 is L-shaped and includes a horizontal plate 111 and a vertical plate 112 connected vertically. The lower end of the terminal body 10 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3, and the top of the terminal body 10 is located outside the inner insulating shell 7. The horizontal plate 111 of the connecting terminal 11 is fixed to the top of the terminal body 10, and the vertical plate 112 of the connecting terminal 11 extends from the insulating top cover 61 and serves as a flat solder end 1a for soldering to a circuit board.

[0092] like Figures 13 to 17 As shown, in the illustrated embodiment, the horizontal plate 111 of the connecting terminal 11 is welded to the top of the terminal body 10 to fix the connecting terminal 11 to the top of the terminal body 10.

[0093] like Figures 13 to 17 As shown in the illustrated embodiment, the terminal body 10 is a one-piece machined part, and the connecting terminal 11 is a one-piece stamped part.

[0094] like Figures 13 to 17 As shown, in the illustrated embodiment, the second stationary contact 2 includes a columnar terminal 20, which is fixed to the inner insulating shell 7. The lower end of the columnar terminal 20 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3, and the upper end of the columnar terminal 20 extends from the insulating top cover 61 for electrical connection to a circuit board or busbar (not shown, e.g., copper busbar).

[0095] like Figures 13 to 17 As shown, in the illustrated embodiment, a threaded connection hole 2a suitable for connection with a threaded fastener (not shown, e.g., a bolt) is formed on the top of the columnar terminal 20, so that the columnar terminal 20 can be fastened to a circuit board or busbar by the threaded fastener.

[0096] like Figures 13 to 17 As shown, in the illustrated embodiment, the inner insulating shell 7 is typically a ceramic component, and the terminal body 10 and the columnar terminal 20 are typically brazed to the inner insulating shell 7.

[0097] like Figures 13 to 17 As shown in the illustrated embodiment, the columnar terminal 20 is a one-piece machined part.

[0098] However, please note that the second stationary contact 2 of the present invention is not limited to the illustrated embodiment. For example, in another exemplary embodiment of the present invention, the second stationary contact 2 may be exactly the same as the first stationary contact 1, so that the first stationary contact 1 and the second stationary contact 2 can be used interchangeably.

[0099] like Figures 13 to 17 As shown in the illustrated embodiment, the contactor further includes a pair of auxiliary contacts (not shown) and a pair of auxiliary terminals 4. The pair of auxiliary contacts are disposed in the arc-extinguishing chamber 70 and are used to detect whether the moving contact 3 has been moved to a closed position where it is in electrical contact with the first and second stationary contacts 1 and 2. The pair of auxiliary terminals 4 are fixed to the insulating top cover 61 and are electrically connected to the pair of auxiliary contacts respectively. The auxiliary terminals 4 are flat and extend from the insulating top cover 61 for soldering to a circuit board.

[0100] like Figures 13 to 17 As shown, in the illustrated embodiment, the auxiliary contact has a lead end 41 extending from the inner insulating shell 7, and the auxiliary terminal 4 is electrically connected to the lead end 41 of the auxiliary contact via a wire 42 for electrical connection with the auxiliary contact.

[0101] like Figures 13 to 17As shown in the illustrated embodiment, the contactor further includes a magnetic cylinder 8 and a coil assembly. The magnetic cylinder 8 is disposed within the outer insulating shell 60 and located below the inner insulating shell 7. The coil assembly is disposed within the magnetic cylinder 8 and includes a coil frame 51 and a coil 50 wound on the coil frame 51. The two terminals 5 of the coil 50 pass through the inner insulating shell 7 and extend from the insulating top cover 61 for soldering to a circuit board.

[0102] like Figures 13 to 17 As shown in the illustrated embodiment, the contactor further includes a plurality of mounting terminals 63, which are fixed to the outer side of the peripheral wall of the top of the outer insulating housing 60. The mounting terminals 63 are flat and designed for soldering to a circuit board to secure the outer insulating housing 60 to the circuit board.

[0103] like Figures 13 to 17 As shown in the illustrated embodiment, a plurality of connecting ears 62 are formed on the outer side of the peripheral wall at the top of the outer insulating shell 60, and a plurality of mounting terminals 63 are respectively fixed to the plurality of connecting ears 62. The outer insulating shell 60 is injection molded onto the plurality of mounting terminals 63, so that the outer insulating shell 60 and the plurality of mounting terminals 63 become a single piece.

[0104] However, the present invention is not limited to the illustrated embodiments. For example, in another exemplary embodiment of the present invention, a plurality of connecting ears 62 are formed on the outer side of the peripheral wall at the top of the outer insulating shell 60, and through holes are formed on the connecting ears 62 to allow threaded fasteners to pass through, so that the outer insulating shell 60 can be fastened to the circuit board by threaded fasteners.

[0105] Fourth embodiment

[0106] Figures 18 to 22 This illustrates a fourth embodiment according to the present invention. Figure 18 A perspective view of a contactor according to an exemplary fourth embodiment of the present invention is shown; Figure 19 A longitudinal sectional view of a contactor according to an exemplary fourth embodiment of the present invention is shown; Figure 20 A perspective view of a contactor according to an exemplary fourth embodiment of the present invention is shown, wherein the outer insulating shell 60 and the insulating top cover 61 are removed; Figure 21 An exploded view of a contactor according to an exemplary fourth embodiment of the present invention is shown, wherein the outer insulating shell 60 and the insulating top cover 61 are removed; Figure 22 This shows a cross-sectional view of the first stationary contact 1 of a contactor according to an exemplary fourth embodiment of the present invention.

[0107] like Figures 18 to 22As shown, in an exemplary embodiment of the present invention, a contactor is disclosed. The contactor includes: an outer insulating shell 60, an insulating top cover 61, an inner insulating shell 7, a moving contact 3, a first stationary contact 1, and a second stationary contact 2. The outer insulating shell 60 has a top opening. The insulating top cover 61 covers the top opening of the outer insulating shell 60. The inner insulating shell 7 is disposed within the outer insulating shell 60 and defines an arc-extinguishing chamber 70. The moving contact 3 is movably disposed within the arc-extinguishing chamber 70. The first stationary contact 1 is fixed to the inner insulating shell 7. The second stationary contact 2 is fixed to the inner insulating shell 7. One end of the first stationary contact 1 and the second stationary contact 2 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3. At least one of the first stationary contact 1 and the second stationary contact 2 has a flat solder end 1a extending from the insulating top cover 61, which is used for soldering to a circuit board (not shown) for electrical connection to the circuit board. For example, a slot is formed on the circuit board for the flat solder end 1a, which can be inserted into the slot on the circuit board and soldered to the circuit board.

[0108] like Figures 18 to 22 As shown in the illustrated embodiment, the first stationary contact 1 includes a terminal body 10 and a connecting terminal 11. The terminal body 10 is cylindrical and fixed to the inner insulating shell 7. The connecting terminal 11 is L-shaped and includes a horizontal plate 111 and a vertical plate 112 connected vertically. The lower end of the terminal body 10 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3, and the top of the terminal body 10 is located outside the inner insulating shell 7. The horizontal plate 111 of the connecting terminal 11 is fixed to the top of the terminal body 10, and the vertical plate 112 of the connecting terminal 11 extends from the insulating top cover 61 and serves as a flat solder end 1a for soldering to a circuit board.

[0109] like Figures 18 to 22 As shown in the illustrated embodiment, the first stationary contact 1 includes a first stationary terminal 100, which is fixed to the inner insulating shell 7. The lower end of the first stationary terminal 100 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3, and the top of the first stationary terminal 100 is located outside the inner insulating shell 7. The first stationary terminal 100 has a first flat upper end 110, which extends from the insulating top cover 61 and serves as a flat solder end 1a for soldering to a circuit board.

[0110] like Figures 18 to 22 As shown in the illustrated embodiment, the second stationary contact 2 includes a second stationary terminal 200. The second stationary terminal 200 is fixed to the inner insulating shell 7. The lower end of the second stationary terminal 200 extends into the arc-extinguishing chamber 70 for electrical contact with the moving contact 3, and the top of the second stationary terminal 200 is located outside the inner insulating shell 7. The second stationary terminal 200 has a second flat upper end 210 that extends from the insulating top cover 61 for soldering to a circuit board.

[0111] like Figures 18 to 22 As shown in the illustrated embodiment, the first stationary terminal 100 and the second stationary terminal 200 are both integrally machined terminals. In the illustrated embodiment, the inner insulating shell 7 is typically a ceramic component, and the first stationary terminal 100 and the second stationary terminal 200 are typically brazed to the inner insulating shell 7.

[0112] like Figures 18 to 22 As shown in the illustrated embodiment, the second stationary contact 2 is exactly the same as the first stationary contact 1, so that the first stationary contact 1 and the second stationary contact 2 can be used interchangeably.

[0113] like Figures 18 to 22 As shown in the illustrated embodiment, the contactor further includes a pair of auxiliary contacts (not shown) and a pair of auxiliary terminals 4. The pair of auxiliary contacts are disposed in the arc-extinguishing chamber 70 and are used to detect whether the moving contact 3 has been moved to a closed position where it is in electrical contact with the first and second stationary contacts 1 and 2. The pair of auxiliary terminals 4 are fixed to the insulating top cover 61 and are electrically connected to the pair of auxiliary contacts respectively. The auxiliary terminals 4 are flat and extend from the insulating top cover 61 for soldering to a circuit board.

[0114] like Figures 18 to 22 As shown, in the illustrated embodiment, the auxiliary contact has a lead end 41 extending from the inner insulating shell 7, and the auxiliary terminal 4 is electrically connected to the lead end 41 of the auxiliary contact via a wire 42 for electrical connection with the auxiliary contact.

[0115] like Figures 18 to 22 As shown in the illustrated embodiment, the contactor further includes a magnetic cylinder 8 and a coil assembly. The magnetic cylinder 8 is disposed within the outer insulating shell 60 and located below the inner insulating shell 7. The coil assembly is disposed within the magnetic cylinder 8 and includes a coil frame 51 and a coil 50 wound on the coil frame 51. The two terminals 5 of the coil 50 pass through the inner insulating shell 7 and extend from the insulating top cover 61 for soldering to a circuit board.

[0116] like Figures 18 to 22 As shown in the illustrated embodiment, the contactor further includes a plurality of mounting terminals 63, which are fixed to the outer side of the peripheral wall of the top of the outer insulating housing 60. The mounting terminals 63 are flat and designed for soldering to a circuit board to secure the outer insulating housing 60 to the circuit board.

[0117] like Figures 18 to 22 As shown in the illustrated embodiment, a plurality of connecting ears 62 are formed on the outer side of the peripheral wall at the top of the outer insulating shell 60, and a plurality of mounting terminals 63 are respectively fixed to the plurality of connecting ears 62. The outer insulating shell 60 is injection molded onto the plurality of mounting terminals 63, so that the outer insulating shell 60 and the plurality of mounting terminals 63 become a single piece.

[0118] However, the present invention is not limited to the illustrated embodiments. For example, in another exemplary embodiment of the present invention, a plurality of connecting ears 62 are formed on the outer side of the peripheral wall at the top of the outer insulating shell 60, and through holes are formed on the connecting ears 62 to allow threaded fasteners to pass through, so that the outer insulating shell 60 can be fastened to the circuit board by threaded fasteners.

[0119] Those skilled in the art will understand that the embodiments described above are exemplary and can be improved upon. The structures described in the various embodiments can be freely combined without causing structural or principle conflicts, and these changes should fall within the protection scope of this invention.

[0120] Although the invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to illustrate preferred embodiments of the invention and should not be construed as limiting the invention.

[0121] While some embodiments of the general concept of the invention have been shown and described, those skilled in the art will understand that changes may be made to these embodiments without departing from the principles and spirit of the general concept of the invention, the scope of which is defined by the claims and their equivalents.

[0122] It should be noted that the word "comprising" does not exclude other elements or steps, and the words "a" or "an" do not exclude multiple elements. Furthermore, any reference numerals in the claims should not be construed as limiting the scope of the invention.

Claims

1. A contactor, characterized in that, include: Outer insulating shell (60) having a top opening; An insulating top cover (61) covers the top opening of the outer insulating shell (60); An inner insulating shell (7) is disposed within the outer insulating shell (60) to define the arc-extinguishing chamber (70); The moving contact (3) is movably disposed in the arc-extinguishing chamber (70); The first stationary contact (1) is fixed to the inner insulating shell (7); and The second stationary contact (2) is fixed to the inner insulating shell (7). One end of the first stationary contact (1) and the second stationary contact (2) extends into the arc-extinguishing chamber (70) for electrical contact with the moving contact (3). At least one of the first stationary contact (1) and the second stationary contact (2) has a flat solder end (1a) extending from the insulating top cover (61), the flat solder end (1a) being soldered to the circuit board for electrical connection with the circuit board.

2. The contactor according to claim 1, characterized in that: The first stationary contact (1) includes: Terminal body (10), cylindrical in shape and fixed to the inner insulating shell (7); and The connecting terminal (11) is L-shaped and includes a horizontal plate (111) and a vertical plate (112) that are vertically connected. The lower end of the terminal body (10) extends into the arc-extinguishing chamber (70) for electrical contact with the moving contact (3), and the top of the terminal body (10) is located outside the inner insulating shell (7). The horizontal plate (111) of the connecting terminal (11) is fixed to the top of the terminal body (10), and the vertical plate (112) of the connecting terminal (11) extends from the insulating top cover (61) and serves as a flat solder end (1a) for soldering to the circuit board.

3. The contactor according to claim 2, characterized in that: A threaded hole (10c) is formed on the top of the terminal body (10), and a connecting hole (11c) corresponding to the threaded hole (10c) is formed on the horizontal plate (111) of the connecting terminal (11); The first stationary contact (1) further includes: A bolt (12) passes through a connecting hole (11c) on the horizontal plate (111) of the connecting terminal (11) and is threaded into a threaded hole (10c) in the terminal body (10) to fasten the connecting terminal (11) to the top of the terminal body (10).

4. The contactor according to claim 3, characterized in that: The first stationary contact (1) further includes: An anti-loosening washer (13) is clamped between the operating head (121) of the bolt (12) and the horizontal plate (111) of the connecting terminal (11) to prevent the bolt (12) from loosening.

5. The contactor according to claim 2, characterized in that: A riveting hole (11a) is formed on the horizontal plate (111) of the connecting terminal (11), and a riveting post (10a) is formed on the top of the terminal body (10). The riveting post (10a) is riveted into the riveting hole (11a) to rivet the connecting terminal (11) to the top of the terminal body (10).

6. The contactor according to claim 2, characterized in that: The horizontal plate (111) of the connecting terminal (11) is welded to the top of the terminal body (10) to fix the connecting terminal (11) to the top of the terminal body (10).

7. The contactor according to claim 2, characterized in that: The terminal body (10) shown is a one-piece machined part, and the connecting terminal (11) is a one-piece stamped part.

8. The contactor according to any one of claims 2-7, characterized in that: The second stationary contact (2) includes: The columnar terminal (20) is fixed to the inner insulating shell (7). The lower end of the columnar terminal (20) extends into the arc-extinguishing chamber (70) for electrical contact with the moving contact (3), and the upper end of the columnar terminal (20) extends out from the insulating top cover (61) for electrical connection to the circuit board or busbar.

9. The contactor according to claim 8, characterized in that: A threaded connection hole (2a) suitable for connection with a threaded fastener is formed on the top of the columnar terminal (20), so that the columnar terminal (20) can be fastened to the circuit board or busbar by the threaded fastener.

10. The contactor according to claim 8, characterized in that: The inner insulating shell (7) is a ceramic part, and the terminal body (10) and the columnar terminal (20) are welded to the inner insulating shell (7) by a brazing process.

11. The contactor according to claim 8, characterized in that: The columnar terminal (20) is a one-piece machined part.

12. The contactor according to any one of claims 2-7, characterized in that: The second stationary contact (2) is exactly the same as the first stationary contact (1), so that the first stationary contact (1) and the second stationary contact (2) can be used interchangeably.

13. The contactor according to claim 1, characterized in that: The first stationary contact (1) includes: The first stationary terminal (100) is fixed to the inner insulating shell (7). The lower end of the first stationary terminal (100) extends into the arc-extinguishing chamber (70) for electrical contact with the moving contact (3), and the top of the first stationary terminal (100) is located outside the inner insulating shell (7). The first stationary terminal (100) has a first flat upper end (110) that extends from the insulating top cover (61) and serves as a flat solder end (1a) for soldering to the circuit board.

14. The contactor according to claim 13, characterized in that: The second stationary contact (2) includes: The second stationary terminal (200) is fixed to the inner insulating shell (7). The lower end of the second stationary terminal (200) extends into the arc-extinguishing chamber (70) for electrical contact with the moving contact (3), and the top of the second stationary terminal (200) is located outside the inner insulating shell (7). The second stationary terminal (200) has a second flat upper end (210) that extends from the insulating top cover (61) for soldering to the circuit board.

15. The contactor according to claim 14, characterized in that: The first stationary terminal (100) and the second stationary terminal (200) are both integrally machined terminals.

16. The contactor according to claim 14, characterized in that: The second stationary contact (2) is exactly the same as the first stationary contact (1), so that the first stationary contact (1) and the second stationary contact (2) can be used interchangeably.

17. The contactor according to claim 1, characterized in that, Also includes: A pair of auxiliary contacts, disposed in the arc-extinguishing chamber (70), are used to detect whether the moving contact (3) has been moved to a closed position in electrical contact with the first and second stationary contacts (1, 2); and A pair of auxiliary terminals (4) are fixed to the insulating top cover (61) and electrically connected to the pair of auxiliary contacts respectively. The auxiliary terminal (4) is flat and extends from the insulating top cover (61) for soldering to the circuit board.

18. The contactor according to claim 17, characterized in that: The auxiliary contact has a lead end (41) extending from the inner insulating shell (7), and the auxiliary terminal (4) is electrically connected to the lead end (41) of the auxiliary contact via a wire (42) to be electrically connected to the auxiliary contact.

19. The contactor according to claim 1, characterized in that, Also includes: A magnetic cylinder (8) is disposed in the outer insulating shell (60) and located below the inner insulating shell (7); and The coil assembly, disposed within the magnetic cylinder (8), includes a coil frame (51) and a coil (50) wound around the coil frame (51). The two terminals (5) of the coil (50) pass through the inner insulating shell (7) and extend from the insulating top cover (61) for soldering to the circuit board.

20. The contactor according to claim 1, characterized in that, Also includes: Multiple mounting terminals (63) are fixed to the outer side of the peripheral wall at the top of the outer insulating shell (60). The mounting terminal (63) is flat and is used to be soldered onto the circuit board to fix the outer insulating shell (60) to the circuit board.

21. The contactor according to claim 20, characterized in that: A plurality of connecting ears (62) are formed on the outer side of the peripheral wall at the top of the outer insulating shell (60), and the plurality of mounting terminals (63) are respectively fixed to the plurality of connecting ears (62); The outer insulating shell (60) is injection molded onto the plurality of mounting terminals (63), so that the outer insulating shell (60) and the plurality of mounting terminals (63) become a single unit.

22. The contactor according to claim 20, characterized in that: Multiple connecting lugs (62) are formed on the outer side of the peripheral wall at the top of the outer insulating shell (60), and through holes are formed on the connecting lugs (62) to allow threaded fasteners to pass through, so that the outer insulating shell (60) can be fastened to the circuit board by threaded fasteners.

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