An electric plug device with overheat protection function

Abstract

This utility model relates to the field of electrical equipment technology, specifically an electrical plug device with overheat protection function. Its features include a housing consisting of a base and a cover that can be interlocked together; the base has raised surrounding or snap-fitting protrusions around its perimeter and a recessed cavity in its center; the cover has a recessed groove within the cavity, and a downwardly protruding pressing protrusion within the recessed groove; a PCB board with soldered electrical pins, a thermal protector, and wire terminals; the PCB board has openings for the pressing protrusions to press against it, and notches at its edges for engaging with the surrounding or snap-fitting protrusions; the PCB board is fitted into the recessed cavity, with the notches engaging with the surrounding or snap-fitting protrusions; the thermal protector is fitted into the recessed groove; and the electrical pins and wire terminals extend out of the housing. This utility model has advantages such as robust and reliable structure and long service life.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to an electrical plug device. Background Technology

[0002] A power plug with an internal thermal protector automatically cuts off power when the circuit temperature is too high, and allows current to flow again once the circuit temperature returns to normal. This is a safe and convenient circuit protection measure. Chinese invention patent application number 202411738416.3, entitled "A Power Plug," provides a power plug with a thermal protection module. In this technical solution, the housing is composed of a first housing and a second housing whose internal cross-sectional shape matches the shape of the conductive plate, and are fastened together. Pins, wires, and a thermal circuit breaker are welded onto the conductive plate. The conductive plate is embedded inside the housing, and the pins and wires extend out of the housing. However, this technology still has the following technical problems in use:

[0003] Although the cross-sectional shape of the inner cavity of the first and second housings matches the shape of the conductive plate, thus allowing the inner sidewall of the housing to limit the conductive plate, the conductive plate and the housing do not form an integral structure. Therefore, when subjected to external impact, the strong shock wave can cause the conductive plate to shift, which in turn can cause the pins, wires, and solder joints of the thermal circuit breaker to loosen or crack, affecting the normal use of the plug, and may even lead to circuit interruption or open circuit, resulting in a shorter service life.

[0004] Given the aforementioned shortcomings of the existing technology, the applicant believes it is essential to improve it to provide a more robust power plug with a longer service life and thermal protection. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned problems and deficiencies, and to provide an electrical plug device with overheat protection function. The PCB board is engaged with the enclosure protrusion or the snap-fit ​​protrusion through the notch, and is assembled with the shell into an integral structure. Even if subjected to strong impact, the PCB board will not shift, so that the solder joints of the electrical pins, wire terminals and thermal protector will not loosen or crack, thus having a very long service life. The top pressure protrusion can also provide strong support for the PCB board, further enhancing the stability of the PCB board.

[0006] The technical solution of this utility model is implemented as follows: an electrical plug device with overheat protection function, characterized in that it includes a housing composed of a base and a cover that can be interlocked together; the base is provided with raised surrounding protrusions or snap-fit ​​protrusions around its perimeter and a cavity is formed in the center of the base; the cover is provided with a cavity groove, and the cavity groove is also provided with a downwardly raised pressing protrusion; a PCB board is welded with electrical pins, a thermal protector and wire terminals; the PCB board is provided with a space for the pressing protrusion to press, and a notch is provided at the edge of the PCB board to engage with the surrounding protrusions or snap-fit ​​protrusions; the PCB board is embedded in the cavity, and the notch engages with the surrounding protrusions or snap-fit ​​protrusions; the thermal protector is embedded in the cavity groove; the electrical pins and wire terminals extend out of the housing.

[0007] Furthermore, the cover is provided with recessed enclosure grooves or snap-fit ​​grooves around its perimeter, and the cover is fastened together by the interlocking of the enclosure grooves and enclosure protrusions, or the snap-fit ​​grooves and snap-fit ​​protrusions; the two ends of the cover are respectively provided with plug holes and terminal slots extending from the power supply pins and wire terminals.

[0008] Furthermore, a snap-fit ​​protrusion is provided on the top surface of the enclosure protrusions located on both sides of the base length direction, and a snap-fit ​​groove matching the snap-fit ​​protrusion is provided at the bottom of the enclosure grooves located on both sides of the cover length direction; the PCB board is placed on the enclosure protrusion, so that the notch snaps into the snap-fit ​​protrusion; the side of the PCB board is sandwiched between the top surface of the enclosure protrusion and the bottom of the enclosure groove.

[0009] Furthermore, the top of the snap-fit ​​protrusion is provided with a snap hook, and the snap-fit ​​groove is provided with a snap hook recess that engages with the snap hook.

[0010] Furthermore, the base is provided with a first support protrusion and a second support protrusion at both ends, corresponding to the pin slot and terminal slot, respectively.

[0011] Furthermore, there are two thermal protectors arranged side by side on the PCB board along its length, forming a gap on the PCB board between the two thermal protectors. The top pressure protrusion is arranged along the length of the cavity groove and separates the two thermal protectors.

[0012] Furthermore, one end of the PCB board is provided with a first solder hole, and one of the terminals of the thermal protector and the end of the wire terminal are soldered to the PCB board through the first solder hole.

[0013] Furthermore, the other end of the PCB board is provided with a second solder hole for welding another terminal of the heating protector, and a third solder hole for welding the power supply pin is provided on the PCB board next to the second solder hole. The second solder hole and the third solder hole are arranged side by side along the length of the PCB board.

[0014] Furthermore, a raised edge is provided on the PCB board located outside the third solder hole, and a corresponding groove is provided on the inner wall of the cover for the raised edge to be fitted.

[0015] Furthermore, the thermal protector consists of a fixed end and a movable end, and the recessed groove is also provided with a pressing protrusion that presses against the fixed end.

[0016] The beneficial effects of this utility model are as follows: First, the PCB board is embedded in the recessed cavity of the base, and the notch on the PCB board is engaged with the retaining protrusion or locking protrusion on the base. In this way, when the base and the cover are fastened together, the PCB board and the cover form an integral structure. When subjected to external impact, the shock wave is absorbed by the cover, thereby preventing the PCB board from shifting and protecting the solder joints on the PCB board from damage. This ensures that the electrical pins, wire terminals, and thermal protectors will not loosen and can work continuously and stably. This gives this application a very robust mechanical structure that can meet stringent inspection requirements. Second, the pressing protrusion on the cover presses against the PCB board, which can also provide strong support for the PCB board. When subjected to impact, it further reduces the vibration on the PCB board and better protects the solder joints, making this utility model more reliable and stable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the disassembled structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the PCB board structure in this utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the cover in this utility model.

[0021] Figure 5 This is a half-sectional structural diagram of the present invention.

[0022] Figure 6 This is a cross-sectional structural diagram of the cover in this utility model.

[0023] Figure 7 This is a schematic diagram of the electrical connector structure in this utility model.

[0024] Figure 8This is a schematic diagram of the assembly structure of the electrical plug, thermal protector, wire terminals, and PCB board in this utility model. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0026] like Figures 1 to 4 As shown, this utility model provides an electrical plug device with overheat protection function. To achieve the purpose proposed by this utility model, it includes: a housing 10 consisting of a base 1 and a cover 2 that can be interlocked together; the base 1 has raised surrounding protrusions 11 or snap-fit ​​protrusions 12 around its perimeter and a recess 13 formed in the center of the base 1; the cover 2 has a recessed groove 21 inside, and the recessed groove 21 also has a downwardly protruding pressing protrusion 22; a plug device welded with... The PCB board 3 includes the electrical plug 4, thermal protector 5, and wire terminal 6. The PCB board 3 has a cavity 31 for the pressing protrusion 22 to press against, and a notch 32 at the edge of the PCB board 3 to engage with the enclosure protrusion 11 or the snap-fit ​​protrusion 12. The PCB board 3 is installed in the cavity 13, and the notch 32 is engaged with the enclosure protrusion 11 or the snap-fit ​​protrusion 12. The thermal protector 5 is installed in the cavity groove 21, and the electrical plug 4 and wire terminal 6 extend out of the housing 10.

[0027] In practical applications, raised retaining protrusions 11 can be provided around the base 1, allowing the notch 32 to engage with the retaining protrusions 11. Alternatively, raised engaging protrusions 12 can be provided around the base 1, allowing the notch 32 to engage with the engaging protrusions 12. Furthermore, both retaining protrusions 11 and engaging protrusions 12 can be provided around the base 1 simultaneously, allowing the notch 32 to engage with either retaining protrusions 11 or engaging protrusions 12. This allows the PCB board 3 to be engaged with the base 1. Then, through the interlocking of the base 1 and the cover 2, the PCB board 3 and the base 1 are assembled into a single unit. When the electrical plug device encounters external impact, it effectively prevents the PCB board 3 from shifting or vibrating, ensuring that the electrical pins 4, thermal protector 5, and wire terminals 6 are firmly soldered onto the PCB board 3. The solder joints will not loosen, ensuring stable operation of the electrical plug device and a long service life.

[0028] like Figure 2 , Figure 4As shown, in order to fasten the cover 2 and the base 1 together, the cover 2 is provided with a recessed enclosure groove 23 or a snap-fit ​​groove 24 around its perimeter. The cover 2 is fastened together by the interlocking of the enclosure groove 23 and the enclosure protrusion 11, or the snap-fit ​​groove 24 and the snap-fit ​​protrusion 12. The two ends of the cover 2 are respectively provided with a power supply pin 4 and a pin slot 25 and a terminal slot 26 extending from the wire terminal 6.

[0029] like Figures 2 to 5 As shown, the cover 2 has recessed retaining grooves 23 around its perimeter, and the PCB board 3 is fitted into the bottom of the retaining grooves 23. A locking protrusion 12 is provided on the top surface of the retaining protrusions 11 located on both sides of the base 1 along its length, and a locking groove 24 matching the locking protrusion 12 is provided at the bottom of the retaining grooves 23 located on both sides of the cover 2 along its length. The PCB board 3 is placed on the retaining protrusions 11, so that the notch 32 engages with the locking protrusion 12. The side of the PCB board 3 is sandwiched between the top surface of the retaining protrusions 11 and the bottom of the retaining grooves 23. Thus, the retaining protrusions 11 and retaining grooves 23, and the locking protrusions 12 and locking grooves 24, form a double-fastening structure, which allows the side of the PCB board 3 to be more firmly fixed between the base 1 and the cover 2, forming a more robust integrated structure with the housing 10, further enhancing the stability of this invention.

[0030] like Figure 2 , Figure 4 As shown, to further improve the firmness of the connection between the base 1 and the cover 2 and enhance the stability of the PCB board 3, the top of the snap-fit ​​protrusion 12 is also provided with a snap hook 121, and the snap-fit ​​groove 24 is provided with a snap hook recess 241 that snaps together with the snap hook 121. In this way, a double-clamping structure is formed inside the cover 2, so that the PCB board 3 is further firmly clamped between the base 1 and the cover 2.

[0031] like Figure 2 As shown, the base 1 has a first support protrusion 14 and a second support protrusion 15 at both ends, corresponding to the pin slot 25 and the terminal slot 26, respectively. When the base 1 and the housing 2 are assembled together, the pin slot 25 and the first support protrusion 14 clamp the electrical pin 4, and the terminal slot 26 and the second support protrusion 15 clamp the wire terminal 6, forming a sealed structure and ensuring the firmness of the electrical pin 4 and the wire terminal 6.

[0032] Furthermore, such as Figure 2 , 6As shown, since the electrical plug 4 is frequently pulled out and subjected to significant external force, a recessed protrusion 141 is provided at the top of the first support protrusion 14 to further enhance the stability of the electrical plug 4. The electrical plug 4 has a first recessed slot 41 that is fitted into the recessed protrusion 141. This recessed structure increases the connection area between the electrical plug 4 and the base 1, thereby improving the stability of the electrical plug 4 and preventing it from loosening even after repeated insertions and removals. The bottom end of the recessed protrusion 141 also has a support inclined surface 142 integrally connected to the base 1, further enhancing the structural strength of the recessed protrusion 141 and making the electrical plug 4 more securely fixed.

[0033] In addition, such as Figure 2 , 5 As shown in Figure 6, the top surface of the PCB board 3 is higher than the insertion protrusion 141. A second insertion slot 42 is also provided on the electrical pin 4 located next to the first insertion slot 41, which is inserted into the edge of the top surface of the PCB board 3. A welding protrusion 40 is also provided on the bottom surface of the electrical pin 4 located next to the second insertion slot 42, which is inserted into and passes through the solder hole. A supporting protrusion 45 is provided on the electrical pin 4 outside the welding protrusion 40. The supporting protrusion 45 is sandwiched between the top surface of the PCB board 3 and the inner top surface of the cover 2. In this way, a very strong interlocking structure is formed between the bottom surface of the electrical pin 4, the base 1, and the PCB board 3. On the top surface of the electrical pin 4 corresponding to the welding bump 40 and the second slot 42, there are also insertion bumps 43 and third slots 44 respectively. On the inner top surface of the cover 2, there are also corresponding insertion grooves 29 and insertion protrusions 20. In this way, the top surface of the electrical pin 4 also forms an interlocking structure with the cover 2, so that the electrical pin 4 can be firmly fixed inside the electrical plug device. Even if subjected to violent testing, it will not loosen, and thus can pass very strict inspections. In addition, the welding bumps 40 can be used to complete the welding on the bottom surface of the PCB board 3, which is easy to operate and the welding is firm.

[0034] like Figure 2 , 4 As shown in Figure 8, there are two thermal protectors 5, which are arranged side-by-side on the PCB board 3 along its length. A gap 31 is formed on the PCB board 3 between the two thermal protectors 5. The top pressure protrusion 22 is arranged along the length of the recessed groove 21, separating the two thermal protectors 5. This not only allows the top pressure protrusion 22 to have a larger volume, providing greater support to the PCB board 3, but also enables the two thermal protectors 5 to form a double-protection structure, thereby better protecting the circuit.

[0035] like Figure 2 , 3As shown in Figures 7 and 8, one end of the PCB board 3 is provided with a first solder hole 35. One of the terminals of the thermal protector 5 and the end of the wire terminal 6 are soldered to the PCB board 3 through the first solder hole 35. This not only makes the structure compact and the length of the PCB board 3 smaller, which helps to reduce the size of the plug device, but also allows the terminal of the thermal protector 5 to be directly connected to the wire terminal 6, so that the heat on the circuit can be transferred to the thermal protector 5 more quickly, thereby enabling the thermal protector 5 to perform a protective action more quickly. Since the terminal of the thermal protector 5 is small and the end of the wire terminal 6 is large, in order to more firmly insert the terminal of the thermal protector 5 and the end of the wire terminal 6 into the first solder hole 35, the first solder hole 35 is composed of a narrow hole 331 and a wide hole 332 that pass through each other.

[0036] like Figure 2 , 3 As shown in Figures 7 and 8, the other end of the PCB board 3 is provided with a second solder hole 36 for welding the other terminal of the thermal protector 5. A third solder hole 37 for welding the power supply pin 4 is provided on the PCB board 3 adjacent to the second solder hole 36, so that the second solder hole 36 and the third solder hole 37 are arranged side-by-side along the length of the PCB board 3. In this way, the power supply pin 4 is welded to the side of the thermal protector 5, thereby reducing the space occupied in the length direction of the PCB board 3, further shortening the length of the PCB board 3, making the structure of this utility model more compact and smaller in size.

[0037] To further enhance the stability of PCB board 3 mounting, such as Figure 2 , 3 As shown in Figure 4, a protruding edge 38 is also provided on the PCB board 3 located outside the third solder hole 37, and a corresponding groove 28 is provided on the inner wall of the housing 2 for the protruding edge 38 to be fitted. In this way, the connection area between the PCB board 3 and the housing 2 can be further increased by fitting the protruding edge 38 into the groove 28, so that the PCB board 3 can be more firmly assembled in the housing 10. At the same time, the force-bearing area at the electrical pin 4 can be increased, increasing the firmness of the electrical pin 4 and preventing it from loosening during long-term use.

[0038] To further enhance the structural robustness of this application, such as Figure 4 , 5 As shown, the thermal protector 5 is composed of a fixed end 51 and a movable end 52. The recessed groove 21 is also provided with a pressing protrusion 27 that presses against the fixed end 51. In this way, the pressing protrusion 27 can add another support point, thereby more firmly confining the thermal protector 5 and the PCB board 3 inside the housing 10.

[0039] In addition, such as Figure 8As shown, the thermal protector 5 and the wire terminal 6 in this application are also provided with welding bumps 40 that pass through the welding holes, so that welding operations can be performed on the back of the PCB board 3, which is convenient for operation and can ensure welding quality. The cavity 13 in the center of the base 1 can provide space to accommodate the welding bumps 40.

[0040] like Figure 2 , 4 As shown, a snap-fit ​​protrusion 12 is provided on the base 1 located between the two first support protrusions 14, and a corresponding snap-fit ​​groove 24 is provided inside the cover 2. The snap-fit ​​groove 24 is located on the inner wall of the enclosure groove 23. An enclosure protrusion 16 is provided on the base 1 located inside the second support protrusion 15, arranged along its width direction, and the height of the enclosure protrusion 16 is lower than the height of the enclosure protrusion 11. The cover 2 is provided with a protrusion groove 200 that matches the enclosure protrusion 16, and the protrusion groove 200 is located at the opening of the enclosure groove 23. In this way, when assembled, both ends of the PCB board 3 can also form an interlocking structure with the base 1 and the cover 2, thereby further enhancing the connection strength and deformation resistance of this utility model.

[0041] like Figure 8 As shown, in this utility model, except for the movable end 52 of the thermal protector 5, all other components are firmly assembled together by a limiting structure. Thus, the electrical plug device of this application has a very robust structure, can pass very rigorous tests, and has very reliable working stability and a long service life.

Claims

1. An electrical plug device having an overheat protection function, characterized by include: A housing (10) consisting of a base (1) and a cover (2) that can be snapped together; the base (1) is provided with raised surrounding protrusions (11) or snap-fit ​​protrusions (12) around its perimeter and a cavity (13) is formed in the center of the base (1); the cover (2) is provided with a cavity groove (21), and the cavity groove (21) is also provided with a downwardly raised pressing protrusion (22). A PCB board (3) with an electrical plug (4), a thermal protector (5) and a wire terminal (6) welded on it; the PCB board (3) has a space (31) for the top pressing protrusion (22) to press, and a notch (32) is provided at the edge of the PCB board (3) to engage with the enclosure protrusion (11) or the snap-fit ​​protrusion (12). The PCB board (3) is embedded in the cavity (13), and the notch (32) is engaged with the enclosure protrusion (11) or the snap-fit ​​protrusion (12). The thermal protector (5) is embedded in the cavity groove (21), and the electrical plug (4) and the wire terminal (6) extend out of the housing (10).

2. The electrical plug device with overheat protection function according to claim 1, wherein: The cover (2) is provided with recessed enclosure grooves (23) or snap-fit ​​grooves (24) around its perimeter. The cover (2) is fastened together by the interlocking of the enclosure grooves (23) and enclosure protrusions (11), or the snap-fit ​​grooves (24) and snap-fit ​​protrusions (12). The two ends of the cover (2) are respectively provided with plug slots (25) and terminal slots (26) extending from the power supply pins (4) and wire terminals (6).

3. The electrical plug apparatus having an overheat protection function according to claim 2, wherein: On the top surface of the enclosure protrusions (11) located on both sides of the base (1) along the length direction, there are snap-fit ​​protrusions (12). On the bottom of the enclosure grooves (23) located on both sides of the cover (2) along the length direction, there are snap-fit ​​grooves (24) that match the snap-fit ​​protrusions (12). The PCB board (3) is placed on the enclosure protrusions (11) so that the notch (32) is snapped together with the snap-fit ​​protrusions (12). The side of the PCB board (3) is sandwiched between the top surface of the enclosure protrusions (11) and the bottom of the enclosure grooves (23).

4. The electrical plug apparatus having an overheat protection function according to claim 3, wherein: The top of the snap-fit ​​protrusion (12) is provided with a snap hook (121), and the snap-fit ​​groove (24) is provided with a snap hook recess (241) that snaps together with the snap hook (121).

5. The electrical plug apparatus having an overheat protection function according to claim 2, wherein: The base (1) is provided with a first support protrusion (14) and a second support protrusion (15) at both ends, corresponding to the pin slot (25) and the terminal slot (26).

6. The electrical plug apparatus having an overheat protection function according to claim 1, wherein: There are two thermal protectors (5). The two thermal protectors (5) are arranged side by side on the PCB board (3) along the length direction of the PCB board (3). A gap (31) is formed on the PCB board (3) between the two thermal protectors (5). The top pressure protrusion (22) is set along the length direction of the cavity groove (21) and separates the two thermal protectors (5).

7. The electrical plug apparatus having an overheat protection function according to claim 6, wherein: One end of the PCB board (3) is provided with a first solder hole (35), and one of the terminals of the thermal protector (5) and the end of the wire terminal (6) are soldered to the PCB board (3) through the first solder hole (35).

8. The electrical plug apparatus having an overheat protection function according to claim 7, wherein: The other end of the PCB board (3) is provided with a second solder hole (36) for welding the other terminal of the heating protector (5), and a third solder hole (37) for welding the power supply pin (4) is provided on the PCB board (3) next to the second solder hole (36); the second solder hole (36) and the third solder hole (37) are arranged side by side along the length of the PCB board (3).

9. The electrical plug device with overheat protection function according to claim 8, characterized in that: A raised edge (38) is provided on the PCB board (3) located outside the third solder hole (37), and a corresponding groove (28) is provided on the inner wall of the cover (2) for the raised edge (38) to be fitted.

10. The electrical plug apparatus having an overheat protection function according to claim 1, wherein: The thermal protector (5) consists of a fixed end (51) and a movable end (52), and the recessed groove (21) is also provided with a pressing protrusion (27) pressing against the fixed end (51).

Images