Polarized plug with overcurrent protection

Abstract

The utility model discloses a polar plug with overcurrent protection device belongs to plug technical field, the utility model discloses a shell, inner core, fuse tube and electric wire, the shell is the casing of two ends opening, the electric wire passes through the shell tail narrow mouth, and the shell head wide mouth is used for the inner core pressure, the inner core is flat base, and the external contour of inner core corresponds with the internal contour of shell, so that the inner core pressure combines into integral structure after the shell, the opposite side wall of inner core rear opening end extends two mutually symmetrical wrinkle clamps, and the electric wire of stretching into the shell inside is installed between two wrinkle clamps. The utility model discloses when the both ends of fuse tube are installed in front clamping piece and rear clamping piece respectively, two arc clamping pieces and two arc side clamping pieces are clamped to the copper cap of both ends of fuse tube, realize stable connection, when the inner core pressure forms integral in the shell, two wrinkle clamps are clamped to the electric wire outer wall under the extrusion of shell inner wall, realize the clamping and stable installation of electric wire.

Description

Technical Field

[0001] This utility model relates to the field of polar plug technology, specifically a polar plug with overcurrent protection device. Background Technology

[0002] A typical polarized plug with a fuse includes a housing, an inner core, a push-cap, copper blade terminals, a fuse, and a wire. The negative terminal is stamped to the wire conductor, and the positive terminal is stamped to the wire. Both terminals are assembled onto the inner core via the fuse and the small copper blade. Because the fuse cap is arc-shaped and connected to the straight walls of the fuse clip, it can loosen, leading to poor contact, potentially causing arcing or even high-temperature hazards. Furthermore, after the inner core and housing are assembled, the outer insulation of the wire can easily be pulled off, posing a safety hazard. To address these issues, this invention provides a polarized plug with an overcurrent protection device. Utility Model Content

[0003] To address the aforementioned technical deficiencies, the purpose of this utility model is to provide a polarized plug with an overcurrent protection device. When the two ends of the fuse are respectively installed in the front and rear clamps, the two arc-shaped clamps and the two arc-shaped side clamps clamp the copper caps at both ends of the fuse, achieving a stable connection. Simultaneously, when the inner core is pressed into the outer shell to form a single unit, the two pleated clamps clamp the outer wall of the wire under the pressure of the inner wall of the outer shell, achieving clamping and stable installation of the wire. This solves the technical problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: This utility model provides a polarized plug with an overcurrent protection device, including: a shell, an inner core, a fuse, and a wire; the shell is a shell with openings at both ends, the narrow end of the shell for the wire to pass through, and the wide end of the shell for the inner core to be pressed in; the inner core is a flat base, the outer contour of the inner core corresponds to the inner contour of the shell, so that the inner core is assembled into an integral structure after being pressed into the shell; the inner core is provided with a first fuse slot, and a small knife copper slot for engaging the small knife copper is opened on the front side of the first fuse slot, and the rear end of the small knife copper is provided with an integrally connected front clamp. The front clamp is installed inside the front side of the first fuse slot; the positive wire is led out from the end of the wire, and the metal core of the positive wire is stamped and connected to the rear clamp, which is installed inside the rear side of the first fuse slot; when the fuse is installed in the first fuse slot, the front and rear copper caps of the fuse are clamped by the corresponding front clamp and the rear clamp respectively; two symmetrical pleated plates extend from the opposite sidewalls of the rear opening end of the inner core, and the wire extending into the shell is installed between the two pleated plates. When the inner core is pressed into the shell to form a whole, the two pleated plates clamp the outer insulation of the wire under the pressure of the inner wall of the shell.

[0005] Preferably, the front clamp includes two arc-shaped clamping pieces, the front ends of which are integrally connected to the copper cap of the knife via a cross piece, and the front end of the fuse is clamped between the two arc-shaped clamping pieces; the rear clamp is a U-shaped clamp, the two sides of which are two arc-shaped side clamping pieces; the inner diameter of the arc-shaped clamping pieces, the inner diameter of the arc-shaped side clamping pieces, and the outer diameter of the copper cap of the fuse are the same, and the bottom piece of the U-shaped clamping piece is provided with a perforation hole.

[0006] Preferably, the inner side of the pleated clamp is provided with a plurality of pleated strips with obtuse triangular cross sections evenly distributed along the length direction; the pleated strips extend away from the inner wall of the pleated clamp and are inclined toward the end of the inner core where the small copper knife is installed; the upper end face of the pleated strip is configured as a first wedge-shaped surface to facilitate the wire being pressed into the inner wall between the two pleated clamps.

[0007] Preferably, a second fuse slot is provided on the inner side of the inner core, close to the first fuse slot, and a spare fuse is installed in the second fuse slot.

[0008] Preferably, the inner core has a slot for engaging the large copper wire at its front end, the wire leads out a negative wire, and the metal core of the negative wire is stamped and connected to the end of the large copper wire; a retaining groove is provided on the rear side of the slot for engaging the large copper wire, and a retaining plate is integrally provided on the side of the end of the large copper wire, the retaining plate being engaged in the retaining groove.

[0009] Preferably, the outer casing has an eave ring extending outward from the wide end of the outer casing, and a push-cover groove is formed on the upper surface of the outer casing, with the push-cover groove passing through the eave ring. The first and second fuse slots are both located within the push-cover groove. The push-cover is slidably installed within the push-cover groove, and vertical limiting strips with a semi-circular cross-section are symmetrically provided on both sides of the front end of the push-cover.

[0010] Preferably, a limiting hole is provided on the bottom surface of the inner core, and a limiting block matching the limiting hole is provided on the inner surface of the outer shell, and a second wedge-shaped surface is provided on the front side of the limiting block.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. When the two ends of the fuse are respectively installed in the front clamp and the rear clamp, the two arc-shaped clamps and the two arc-shaped side clamps clamp the copper caps at both ends of the fuse to achieve a stable connection. In addition, the inner diameter of the arc-shaped clamps, the inner diameter of the arc-shaped side clamps and the outer diameter of the copper caps of the fuse are the same to ensure full contact and stable clamping connection. The arc-shaped clamps and the arc-shaped side clamps are all metal elastic copper sheets to ensure snap-fit ​​and stable clamping.

[0013] 2. When the inner core is pressed into the outer shell to form an integral part, the two pleated clamps clamp the outer wall of the wire under the pressure of the inner wall of the outer shell, thereby achieving clamping and stable installation of the wire; several pleated strips are evenly distributed on the inner side of the pleated clamps to improve the clamping effect and ensure stable connection; the pleated strips are inclined towards the end of the inner core where the small copper knife 5 is installed to prevent the wire from slipping backward and improve clamping stability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0015] Figure 1 This is a schematic diagram of the structure of the polarized plug with overcurrent protection device provided by this utility model.

[0016] Figure 2 for Figure 1 A schematic diagram of the structure without the outer casing and push-open cover.

[0017] Figure 3 This is a schematic diagram of the inner core structure in this utility model.

[0018] Figure 4 for Figure 3 Enlarged image.

[0019] Figure 5 This is a schematic diagram of the structure of the wire, the small copper blade, and the large copper blade in this utility model.

[0020] Figure 6 This is a schematic diagram of the structure of the copper knife in this utility model.

[0021] Figure 7 This is a schematic diagram of the outer shell of this utility model.

[0022] Figure 8 This is a schematic diagram of the push-top cover in this utility model.

[0023] Explanation of reference numerals in the attached drawings: 1-Outer shell, 11-Eaves ring, 12-Push cover groove, 13-Limiting block, 131-Second wedge-shaped surface, 2-Inner core, 21-First fuse slot, 211-Small knife copper slot, 22-Pleated clamping plate, 221-Pleated strip, 222-First wedge-shaped surface, 23-Large knife copper slot, 24-Second fuse slot, 25-Limiting hole, 3-Fuse, 4-Wire, 41-Positive wire, 42-Negative wire, 5-Small knife copper, 51-Arc-shaped clamping piece, 52-Arc-shaped side clamping piece, 53-Vacuum hole, 6-Large knife copper, 61-Baffle, 7-Push cover, 71-Vertical limiting strip, 71-Vertical limiting strip. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1:

[0026] like Figures 1 to 8 As shown, this embodiment provides a polarized plug with overcurrent protection, including: a housing 1, an inner core 2, a fuse 3, and a wire 4; the housing 1 is a shell with openings at both ends, with the narrow end of the housing 1 through which the power supply wire 4 passes and extends, and the wide end of the housing 1 for the inner core 2 to be pressed in; the inner core 2 is a flat base, and the outer contour of the inner core 2 corresponds to the inner contour of the housing 1, so that the inner core 2 is assembled into a single structure after being pressed into the housing 1. The inner core 2 is provided with a first fuse slot 21, and a small knife copper slot 211 for engaging the small knife copper 5 is opened on the front side of the first fuse slot 21. The rear end of the small knife copper 5 is provided with an integrally connected front clamp, that is, the front clamp and the small knife copper 5 are integrally formed, and the front clamp is also made of copper; the front clamp is installed inside the front side of the first fuse slot 21. A positive electrode wire 41 is led out from the end of the wire 4. The metal core of the positive electrode wire 41 is stamped and connected to a rear clamp, which is also made of copper. The rear clamp is installed inside the rear side of the first fuse slot 21. When the fuse 3 is installed in the first fuse slot 21, the front and rear copper caps of the fuse 3 are clamped by the corresponding front and rear clamps, respectively. In fact, when both ends of the fuse 3 are installed in the front and rear clamps, the front and rear clamps are tightly pressed against the front and rear ends inside the first fuse slot 21 to ensure stable installation. By clamping the front and rear copper caps of the fuse 3 by the corresponding front and rear clamps, loose connections that could lead to poor contact, arcing, or even high-temperature hazards are avoided, thus improving connection stability and safety.

[0027] Two symmetrical corrugated clamps 22 extend from the opposite sidewall of the rear opening end of the inner core 2. The wire 4, which extends into the outer shell 1, is installed between the two corrugated clamps 22. When the inner core 2 is pressed into the outer shell 1 to form a whole, the two corrugated clamps 22 clamp the outer insulation of the wire 4 under the pressure of the inner wall of the outer shell 1, thereby achieving clamping and stable installation of the wire 4.

[0028] For further details, please refer to Figure 2 , Figure 5 and Figure 6 As shown, the front clamp includes two arc-shaped clamping pieces 51. The front ends of the two arc-shaped clamping pieces 51 are integrally connected to the copper knife 5 via a horizontal piece. The front end of the fuse 3 is clamped between the two arc-shaped clamping pieces 51. The rear clamp is a U-shaped clamp, and the two sides of the U-shaped clamp are two arc-shaped side clamping pieces 52. The inner diameter of the arc-shaped clamping piece 51, the inner diameter of the arc-shaped side clamping piece 52, and the outer diameter of the copper cap of the fuse 3 are the same. That is, the inner side of the arc-shaped clamping piece 51 and the inner side of the arc-shaped side clamping piece 52 are in full contact with the outer side of the copper cap. At the same time, the arc-shaped clamping piece 51 and the arc-shaped side clamping piece 52 are both elastic copper sheets to ensure snap-fit ​​and stable clamping. The bottom piece of the U-shaped clamp has a perforated hole 53 to save material.

[0029] For further details, please refer to Figure 3 and Figure 4 As shown, several pleated strips 221 with obtuse-angled triangles are evenly distributed along the length of the inner side of the pleated clamping plate 22 to improve the clamping effect and ensure stable connection. The pleated strips 221 extend away from the inner wall of the pleated clamping plate 22, and the pleated strips 221 are inclined towards the end of the inner core 2 where the small copper knife 5 is installed to prevent the wire 4 from slipping backward and improve clamping stability. The upper end surface of the pleated strips 221 is set as a first wedge-shaped surface 222 to facilitate the wire 4 to be pressed into the inner wall of the two pleated clamping plates 22. In fact, the diameter of the wire 4 is slightly larger than the distance between the two pleated strips 221, so the presence of the first wedge-shaped surface 222 facilitates the wire 4 to be clamped between the two pleated strips 221.

[0030] For further details, please refer to Figure 2 As shown, a second fuse slot 24 is provided on the inner side of the inner core 2, close to the first fuse slot 21. A spare fuse 3 is installed in the second fuse slot 24. The fuse 3 in the second fuse slot 24 is a spare and can be replaced after damage.

[0031] For further details, please refer to Figures 2 to 3 As shown, the inner core 2 has a large copper slot 23 at the front end for engaging the large copper 6. The wire 4 leads out the negative wire 42, and the metal core of the negative wire 42 is stamped and connected to the end of the large copper 6. A retaining groove is opened on the rear side of the large copper slot 23. A retaining plate 61 is integrally provided on the side of the end of the large copper 6. The retaining plate 61 is engaged in the retaining groove to ensure the stable installation of the large copper 6.

[0032] For further details, please refer to Figure 1 , Figure 7 as well as Figure 8 As shown, the outer casing 1 has an eave ring 11 extending outward from the wide end of the outer casing 1. A push-cover groove 12 is opened on the upper surface of the outer casing 1 and the push-cover groove 12 passes through the eave ring 11. The first fuse slot 21 and the second fuse slot 24 are both located in the push-cover groove 12. The push-cover 7 is slidably installed in the push-cover groove 12. The front end of the push-cover 7 is symmetrically provided with vertical limiting strips 71 with a semi-circular cross-section on both sides. The setting of the vertical limiting strips 71 ensures the stable locking of the push-cover 7 after installation. When it is necessary to check the internal circuit or replace the fuse 3, the push-cover 7 can be pushed out, which is convenient and practical.

[0033] For further details, please refer to Figure 3 and Figure 7 As shown, a limiting hole 25 is opened on the bottom surface of the inner core 2, and a limiting block 13 matching the limiting hole 25 is opened on the inner ground of the outer shell 1. A second wedge-shaped surface 131 is provided on the front side of the limiting block 13, so that the limiting block 13 can be inserted into the limiting hole 25, while ensuring a stable connection between the inner core 2 and the outer shell 1.

[0034] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A polar plug with overcurrent protection, characterized in that include: The outer casing (1), the inner core (2), the fuse (3), and the wires (4); The outer shell (1) is a shell with openings at both ends. The narrow opening at the tail end of the outer shell (1) is for the wire (4) to pass through, and the wide opening at the head end of the outer shell (1) is for the inner core (2) to be pressed in. The inner core (2) is a flat base, and the outer contour of the inner core (2) corresponds to the inner contour of the outer shell (1), so that the inner core (2) is pressed into the outer shell (1) to form an integral structure; The inner core (2) is provided with a first fuse slot (21). A small copper slot (211) for snapping into a small copper (5) is opened on the front side of the first fuse slot (21). The small copper (5) is provided with an integrally connected front clamp at the rear end. The front clamp is installed inside the front side of the first fuse slot (21). The positive electrode wire (41) is led out from the end of the wire (4). The metal core of the positive electrode wire (41) is stamped and connected to the rear clamp. The rear clamp is installed inside the rear side of the first fuse slot (21). When the fuse (3) is installed in the first fuse slot (21), the front and rear copper caps of the fuse (3) are clamped by the corresponding front clamp and the rear clamp, respectively. Two symmetrical pleated clamps (22) extend from the rear opening end of the inner core (2) to the opposite side wall. The wire (4) extending into the outer shell (1) is installed between the two pleated clamps (22). When the inner core (2) is pressed into the outer shell (1) to form a whole, the two pleated clamps (22) clamp the outer insulation of the wire (4) under the pressure of the inner wall of the outer shell (1).

2. The polarized plug with overcurrent protection device as described in claim 1, characterized in that, The front clamp includes two arc-shaped clamping pieces (51), the front ends of the two arc-shaped clamping pieces (51) are integrally connected to the small copper knife (5) through a horizontal piece, and the front end of the fuse (3) is clamped between the two arc-shaped clamping pieces (51); the rear clamp is a U-shaped clamp, and the two sides of the U-shaped clamp are two arc-shaped side clamping pieces (52); the inner diameter of the arc-shaped clamping piece (51), the inner diameter of the arc-shaped side clamping piece (52) and the outer diameter of the copper cap of the fuse (3) are the same, and the bottom piece of the U-shaped clamp is provided with a hole (53).

3. The polarized plug with overcurrent protection device as described in claim 1, characterized in that, The inner side of the pleated clamp (22) is evenly provided with a number of pleated strips (221) with obtuse triangular cross sections along the length direction; the pleated strips (221) extend away from the inner wall of the pleated clamp (22), and the pleated strips (221) are inclined toward the end of the inner core (2) where the small copper knife (5) is installed; the upper end surface of the pleated strips (221) is set as a first wedge-shaped surface (222) to facilitate the wire (4) to be pressed into the inner wall between the two pleated clamps (22).

4. The polarized plug with overcurrent protection device as described in claim 1, characterized in that, The inner core (2) has a second fuse slot (24) close to the first fuse slot (21) on its inner side, and a spare fuse (3) is installed in the second fuse slot (24).

5. The polarized plug with overcurrent protection device as described in claim 1, characterized in that, The inner core (2) has a large copper slot (23) at the front end for engaging the large copper (6). The wire (4) leads out a negative wire (42). The metal core of the negative wire (42) is stamped and connected to the end of the large copper (6). A retaining groove is opened on the rear side of the large copper slot (23). A retaining plate (61) is integrally provided on the side of the end of the large copper (6). The retaining plate (61) is engaged in the retaining groove.

6. The polarized plug with overcurrent protection device as described in claim 1, characterized in that, The outer shell (1) has an eave ring (11) extending outward from the wide end of the outer shell (1). A push cover groove (12) is opened on the upper surface of the outer shell (1) and the push cover groove (12) passes through the eave ring (11). The first fuse groove (21) and the second fuse groove (24) are both located in the push cover groove (12). A push cover (7) is slidably installed in the push cover groove (12). Vertical limiting strips (71) with a semi-circular cross-section are symmetrically provided on both sides of the front end of the push cover (7).

7. The polarized plug with overcurrent protection device as described in claim 1, characterized in that, The inner core (2) has a limiting hole (25) on its bottom surface, and the outer shell (1) has a limiting block (13) that matches the limiting hole (25) on its inner surface. The limiting block (13) has a second wedge-shaped surface (131) on its front side.

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