Surface-mounted resettable fuse

Abstract

The utility model relates to the technical field of fuses, and particularly discloses a patch type resettable fuse, which comprises a fuse structure and a rotating frame, two ends of the rotating frame are respectively and fixedly provided with a wire holder I and a wire holder II, the wire holder I comprises an L-shaped metal seat and a concave hole, a spring is fixedly arranged in the concave hole, a metal ball head column is fixedly arranged outside the spring, and the metal ball head column is fixedly connected with the rotating frame. The fuse structure comprises a first fuse box, an insulating plate and a second fuse box which are sequentially and fixedly connected from top to bottom. According to the technical scheme of the utility model, the spring is matched with the metal ball head column, so that the metal ball head column is elastically matched with the ball head hole of the fuse structure in a limiting manner, and the fuse structure is provided with the two independent fuse boxes. And the rotatable fuse structure is quickly switched to another unused fuse box, so that the normal use of the electrical equipment is quickly recovered.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to a chip-type resettable fuse. Background Art

[0002] Resettable fuses can be divided into SMD resettable fuses and plug-in resettable fuses. With the increasing miniaturization of product requirements, the use of SMD fuses has become more and more extensive. Resettable fuses are composed of specially treated polymer resins and conductive particles distributed inside. Under normal operation, the polymer resin tightly binds the conductive particles outside the crystalline structure to form a chain-like conductive electrical path. At this time, the resettable fuse is in a low-resistance state, and the heat energy generated by the current flowing through the resettable fuse on the line is small and will not change the crystal structure. When the line is short-circuited or overloaded, the heat generated by the large current flowing through the resettable fuse causes the polymer resin to melt, the volume grows rapidly, and a high-resistance state is formed. The working current decreases rapidly, thereby limiting and protecting the circuit. When the fault is eliminated, the PTC resettable fuse cools down and crystallizes again, shrinks in volume, and the conductive particles re-form a conductive path. The resettable fuse returns to a low-resistance state, thereby completing the protection of the circuit without manual replacement. However, the SMD resettable fuse has a service life. When the conductive particle layer of the resettable fuse is damaged, it needs to be replaced with a new one in time. Fuse accessories are often not carried during daily inspections. When the fuse is damaged, it is necessary to go to the warehouse to get the corresponding fuse accessories. Only after replacement can power be restored. There is a problem of delayed conduction of the power circuit, which urgently needs to be improved. Therefore, we propose a SMD resettable fuse. Utility Model Content

[0003] The utility model aims to provide a chip-type resettable fuse, which solves the problems raised in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a chip-type resettable fuse, comprising a fuse structure and a rotating frame, wherein the fuse structure is arranged inside the rotating frame by rotating the shaft, and a wiring seat 1 and a wiring seat 2 are respectively fixedly arranged at both ends of the rotating frame, and the structure size of the wiring seat 1 and the wiring seat 2 are consistent, and the wiring seat 1 comprises an L-shaped metal seat, and a concave hole is opened on the vertical surface of the L-shaped metal seat, and a spring is fixedly arranged inside the concave hole, and a metal ball head column is fixedly arranged outside the spring;

[0005] The fuse structure includes a fuse box 1, an insulating plate and a fuse box 2 which are fixedly connected in sequence from top to bottom. An electrode plate 1, a conductive material layer and an electrode plate 2 are arranged inside the fuse box 1 and the fuse box 2. Metal contact blocks are fixedly arranged at both ends of the electrode plate 1 and the electrode plate 2. The metal contact blocks are provided with ball head holes which are inlaid and matched with metal ball head columns.

[0006] As a preferred implementation of the technical solution of the present application, the number of metal ball studs on the terminal block 1 is two, and metal contact blocks are provided at both ends of the fuse box 1, and the number of ball head holes on the metal contact blocks is consistent with the number of metal ball studs.

[0007] As a preferred implementation of the technical solution of the present application, the electrode plate 1 and the electrode plate 2 are arranged opposite to each other up and down, and a conductive material layer is filled between the electrode plate 1 and the electrode plate 2.

[0008] As a preferred implementation of the technical solution of the present application, the vertical end surface of the metal contact block having the ball head hole is vertically aligned with the vertical end surfaces on both sides of the fuse structure.

[0009] As a preferred implementation of the technical solution of the present application, shaft holes are opened on both sides of the insulating plate, and shaft bodies are embedded in the shaft holes, and the shaft bodies are rotatably connected to the inner wall of the rotating frame.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] The technical solution of the present application uses a spring to cooperate with a metal ball head column, so that the metal ball head column and the ball head hole of the fuse structure are elastically limited and cooperated. Since the fuse structure is provided with two independent fuse boxes, when the fuse in the fuse box in use blows, the rotatable fuse structure can be quickly switched to another unused fuse box, thereby quickly restoring normal use of the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0013] Figure 1 This is a three-dimensional diagram of a chip-type resettable fuse of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the wiring socket of the utility model;

[0015] Figure 3 It is a partial cross-sectional view of the wiring socket of the utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the fuse of the utility model;

[0017] Figure 5 It is a cross-sectional view of the fuse structure of the utility model;

[0018] Figure 6 The figure is a structural schematic diagram of the fuse box of the utility model.

[0019] In the figure: 1, rotating frame; 2, fuse structure; 201, fuse box one; 202, insulating plate; 203, fuse box two; 3, terminal block one; 301, L-shaped metal seat; 302, metal ball head column; 303, spring; 4, terminal block two; 5, ball head hole; 6, shaft hole; 7, electrode plate one; 8, conductive material layer; 9, electrode plate two; 10, metal contact block. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Embodiment 1, as Figure 1-6 As shown, the utility model provides a technical solution: a chip-type resettable fuse, comprising a fuse structure 2 and a rotating frame 1, wherein the fuse structure 2 is arranged inside the rotating frame 1 by rotating the shaft, and a terminal block 1 3 and a terminal block 2 4 are respectively fixedly arranged at both ends of the rotating frame 1, and the terminal block 1 3 and the terminal block 2 4 have the same structural dimensions, and the terminal block 1 3 comprises an L-shaped metal seat 301, and a concave hole is opened on the vertical surface of the L-shaped metal seat 301, and a spring 303 is fixedly arranged inside the concave hole, and a metal ball head column 302 is fixedly arranged outside the spring 303;

[0022] The fuse structure 2 includes a fuse box 1 201, an insulating plate 202 and a fuse box 2 203 which are fixedly connected in sequence from top to bottom. The fuse box 1 201 and the fuse box 2 203 are both provided with an electrode plate 1 7, a conductive material layer 8 and an electrode plate 2 9. Both ends of the electrode plate 1 7 and the electrode plate 2 9 are fixedly provided with a metal contact block 10. The metal contact block 10 is provided with a ball head hole 5 which is inlaid with a metal ball head column 302. The electrode plate 1 7 and the electrode plate 2 9 are arranged opposite to each other in upper and lower directions, and the conductive material layer 8 is filled between the electrode plate 1 7 and the electrode plate 2 9.

[0023] In a specific embodiment of the utility model, the rotating frame 1 is made of insulating material, and the terminal block 1 3 and the terminal block 2 4 are fixed to the two ends of the rotating frame 1 by a hot melt process. The horizontal seats of the terminal block 1 3 and the terminal block 2 4 are both provided with arc openings for fixing the terminal bolts. The fuse structure 2 is composed of a fuse box 1 201, a fuse box 203 and an insulating plate 202. The interior of the fuse box is composed of an electrode plate 1 7, a conductive material layer 8 and an electrode plate 2 9. The conductive material layer 8 is composed of a specially treated polymer resin and conductive particles distributed therein. The metal contact block 10 of the electrode plate 1 7 is used to electrically contact with the terminal block 1 3, and the metal contact block 10 of the electrode plate 2 9 is used to electrically contact with the terminal block 2 4. The spring 303 cooperates with the metal ball head column 302, so that the metal ball head column 302 and the ball head hole 5 of the fuse structure 2 are elastically limited.

[0024] In some technical solutions, the number of metal ball head columns 302 of the terminal block 3 is two, and metal contact blocks 10 are provided at both ends of the fuse box 201. The number of ball head holes 5 of the metal contact block 10 is consistent with the number of metal ball head columns 302. The two metal ball head columns 302 cooperate with the ball head holes 5 of the metal contact block 10 to improve the stability of electrical contact.

[0025] In some technical solutions, the vertical end face of the metal contact block 10 with the ball head hole 5 is vertically aligned with the vertical end faces on both sides of the fuse structure 2, and the insulating plate 202 has an axial hole 6 on both sides. An axial body is embedded in the axial hole 6, and the axial body is rotatably connected to the inner wall of the rotating frame 1, so that the fuse structure 2 can rotate smoothly inside the rotating frame 1.

[0026] Working principle: When the two ends of the fuse box 1 201 are electrically matched with the terminal block 1 3 and the terminal block 2 4 respectively, the fuse box 1 201 plays the function of circuit protection. When the conductive material layer 8 inside the fuse box 1 201 fails, the fuse structure 2 can be rotated 180° and quickly switched to another unused fuse box 2 203, thereby quickly restoring the normal use of the electrical equipment.

Claims

1. A chip-type resettable fuse, comprising a fuse structure (2) and a rotating frame (1), characterized in that: The fuse structure (2) is rotatably arranged inside the rotating frame (1) via an axis, and a first wiring seat (3) and a second wiring seat (4) are respectively fixedly arranged at two ends of the rotating frame (1), and the first wiring seat (3) and the second wiring seat (4) have the same structural dimensions, and the first wiring seat (3) comprises an L-shaped metal seat (301), and a concave hole is provided on the vertical surface of the L-shaped metal seat (301), and a spring (303) is fixedly arranged inside the concave hole, and a metal ball head column (302) is fixedly arranged outside the spring (303); The fuse structure (2) comprises a fuse box 1 (201), an insulating plate (202) and a fuse box 2 (203) which are fixedly connected in sequence from top to bottom; an electrode plate 1 (7), a conductive material layer (8) and an electrode plate 2 (9) are arranged inside the fuse box 1 (201) and the fuse box 2 (203); metal contact blocks (10) are fixedly arranged at both ends of the electrode plate 1 (7) and the electrode plate 2 (9); and the metal contact blocks (10) are provided with ball head holes (5) which are embedded and matched with the metal ball head columns (302).

2. A chip type resettable fuse according to claim 1, characterized in that: The number of the metal ball head columns (302) of the wiring seat 1 (3) is two, and the metal contact blocks (10) are provided at both ends of the fuse box 1 (201), and the number of the ball head holes (5) of the metal contact blocks (10) is consistent with the number of the metal ball head columns (302).

3. A chip type resettable fuse according to claim 1, characterized in that: The electrode plate one (7) and the electrode plate two (9) are arranged opposite to each other in the upper and lower parts, and the conductive material layer (8) is filled between the electrode plate one (7) and the electrode plate two (9).

4. A chip type resettable fuse according to claim 1, characterized in that: The vertical end surface of the metal contact block (10) on which the ball head hole (5) is opened is vertically aligned with the vertical end surfaces on both sides of the fuse structure (2).

5. A chip-type resettable fuse according to claim 1, characterized in that: Axial holes (6) are provided on both sides of the insulating plate (202), and an axle body is embedded in the axle hole (6), and the axle body is rotatably connected to the inner wall of the rotating frame (1).

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