Novel structure for improving DC breaking capacity of fuse

Abstract

The utility model discloses a novel structure for improving the DC breaking capacity of a fuse, which comprises a base, a shell, electrodes, a fuse body, a filler and a filler, the shell is clamped on the base, the two electrodes are vertically inserted on the base, the flattened parts at the tops of the two electrodes are conducted and connected through the fuse body, the fuse body is positioned in the shell, and the filler is arranged in the shell. The fuse comprises a base, an electrode and a fuse body, a welding point of the fuse body and the electrode is covered with a filling agent, the filling agent adopts insulating resin, the fuse body adopts a monomer fuse wire, the monomer fuse wire is bent, the filling agent is exposed out of a bending area of the monomer fuse wire, and a cavity formed by the base, the filling agent and a shell is filled with a filling material which is used for multiple hindering of continuous flashover of an electric arc when the fuse breaks a large current. And the filler is quartz sand. Through the above mode, the fuse is ingenious in design, is convenient and rapid to install, can enhance the electrical insulating property after the fuse is fused, and prevents electric arc from directly penetrating between the electrodes.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to a novel structure for improving the DC breaking capacity of a fuse. Background Art

[0002] In the existing plastic square products, the fuse wire is wound around the fiberglass wire to form a melt body. The electrode terminals cover both ends of the melt body, and a stable electrical path is formed through welding. The cavity formed by the outer shell and the base is filled with quartz sand filler, which is used to block the continuous arc during the breaking of large current by the fuse. During the breaking test, the metal particles after the melting of the fuse wire of the melt body are dispersed and attached to the surface of the fiberglass wire. Under high voltage between the two electrodes, it is easy to continuously generate an arc. For AC circuits, the arc can also be extinguished when the voltage passes through zero, but for DC circuits, it is difficult to extinguish the arc because there is no zero point of voltage.

[0003] Based on the above defects and deficiencies, it is necessary to improve the existing technology and design a novel structure for improving the DC breaking capacity of a fuse. Summary of the Utility Model

[0004] The main technical problem to be solved by the utility model is to provide a novel structure for improving the DC breaking capacity of a fuse, which is ingeniously designed, convenient and quick to install, can enhance the electrical insulation after the fuse is melted, and prevent the arc from directly penetrating between the electrodes.

[0005] To solve the above technical problem, a technical solution adopted by the utility model is: to provide a novel structure for improving the DC breaking capacity of a fuse, which includes a base, an outer shell, electrodes, a melt body, a filler and a filling material. The outer shell is snap-fitted on the base. Two electrodes are vertically inserted into the base. The flattened parts at the tops of the two electrodes are conductively connected through the melt body. The melt body is located inside the outer shell. The welding points of the melt body and the electrodes are covered with the filler. The melt body adopts a single fuse wire, and the single fuse wire is bent. The bent area of the single fuse wire exposes the filler. The cavity formed by the base, the filler and the outer shell is filled with a filling material for multiple hindrances to the continuous arc during the breaking of large current by the fuse.

[0006] Preferably, the tops of the electrodes are flattened.

[0007] Preferably, the melt body is welded to the electrodes.

[0008] Preferably, the filler adopts insulating resin.

[0009] Preferably, the filling material adopts quartz sand.

[0010] Preferably, the outer shell is provided with a cavity for accommodating the base, and a guiding inclined surface for facilitating the insertion of the base is arranged at the opening of the cavity.

[0011] Preferably, reverse buckling bosses are provided on both sides in the width direction of the base, reverse buckling bayonets are provided on the housing corresponding to the positions of the reverse buckling bosses, and the base and the housing are locked through a reverse buckling structure.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. Advantages of changing the melt from a fuse wire wound around a glass fiber wire to a monomer fuse wire and flattening and welding the electrode to the fuse wire:

[0014] a. Prevent the fuse wire from melting into metal particles and adhering to the glass fiber wire, enhancing the electrical insulation after the fuse melts;

[0015] b. Eliminate the process of winding the fuse wire around the glass fiber wire, saving the manufacturing cost.

[0016] 2. Advantages of completely wrapping the electrode solder joint with an insulating resin filler:

[0017] a. Prevent the arc from directly penetrating between the electrodes;

[0018] b. The groove left after the fuse wire melts becomes the closest path for arcing between the electrodes, increasing the minimum air separation distance between the electrodes.

[0019] 3. The fuse wire is completely wrapped by quartz sand filler. After fusing, the melted metal particles of the fuse wire will be dispersed in the gaps of the quartz sand, reducing the distribution density of the metal particles, increasing the electrical insulation after the fuse breaks the current, improving the breaking capacity of the product, especially greatly improving the DC breaking capacity of the fuse. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a novel structure for improving the DC breaking capacity of a fuse.

[0021] Figure 2 It is an unfolded schematic structural diagram of a novel structure for improving the DC breaking capacity of a fuse.

[0022] Figure 3 It is an internal structural schematic diagram of a novel structure for improving the DC breaking capacity of a fuse.

[0023] Figure 4 It is an outer shell structural schematic diagram of a novel structure for improving the DC breaking capacity of a fuse.

[0024] Among them, 1. Base, 11. Reverse buckling boss, 2. Housing, 20. Cavity, 21. Guide slope, 22. Reverse buckling bayonet, 3. Electrode, 4. Melt, 5. Filler, 6. Filler. Detailed Embodiment

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0026] See also Figures 1 to 4 , the utility model embodiment includes:

[0027] A novel structure for improving the DC breaking capacity of a fuse, the novel structure for improving the DC breaking capacity of a fuse comprises a base 1, a shell 2, an electrode 3, a melt 4, a filler 5 and a filler 6, the shell 2 is clamped on the base 1, two electrodes 3 are vertically inserted on the base 1, the top of the electrode 3 is flattened, the flattened parts of the tops of the two electrodes 3 are connected through the melt 4, the melt 4 is located in the shell 2, the melt 4 and the electrode 3 are welded together, the welding point between the melt 4 and the electrode 3 is covered with a filler 5, the filler 5 is made of insulating resin to prevent the arc from directly penetrating between the electrodes, the groove left after the fuse melts becomes the closest channel for arcing between the electrodes, and the minimum spacing distance between the electrodes is increased, the melt 4 A single fuse is used to prevent the metal particles melted by the fuse from adhering to the glass fiber wire, thereby enhancing the electrical insulation of the fuse after it is blown, removing the process of winding the fuse around the glass fiber wire, saving process costs, and a single fuse is bent. The filler 5 is exposed in the bent area of ​​the single fuse. The cavity formed by the base 1, the filler 5 and the shell 2 is filled with a filler 6 for multiple obstacles to the continuous arcing of the arc when the fuse breaks a large current. The filler 6 is made of quartz sand, and the fuse is completely wrapped by the quartz sand filler. After breaking, the metal particles melted by the fuse will be dispersed in the gaps of the quartz sand, reducing the distribution density of the metal particles, increasing the electrical insulation of the fuse after breaking the current, and improving the product breaking capacity, especially greatly improving the DC breaking capacity of the fuse.

[0028] The housing 2 is provided with a cavity 20 for accommodating the base 1 , and a guiding inclined surface 21 for facilitating the insertion of the base 1 is provided at the opening of the cavity 20 .

[0029] The base 1 is provided with undercut bosses 11 on both sides in the width direction, and the shell 2 is provided with undercut slots 22 corresponding to the undercut bosses 11. The base 1 and the shell 2 are locked by the undercut structure, and the two are firmly combined and will not be easily separated.

[0030] The utility model discloses a novel structure for improving the DC breaking capacity of a fuse, which has an ingenious design and is convenient and quick to install, and can enhance the electrical insulation of the fuse after it is blown, thereby preventing an electric arc from directly penetrating between electrodes.

[0031] The above are only embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present utility model.

Claims

1. A novel structure for improving the DC breaking capacity of a fuse, characterized in that: The invention comprises a base (1), a shell (2), an electrode (3), a melt (4), a filler (5) and a filler (6); the shell (2) is clamped on the base (1); two electrodes (3) are vertically inserted on the base (1); the flattened top portions of the two electrodes (3) are conductively connected via the melt (4); the melt (4) is located in the shell (2); the welding point between the melt (4) and the electrode (3) is covered with the filler (5); the melt (4) adopts a single fuse; the single fuse is bent; the filler (5) is exposed in the bent area of ​​the single fuse; and the cavity formed by the base (1), the filler (5) and the shell (2) is filled with fillers (6) for preventing the continuous arcing of the arc when the fuse cuts off a large current.

2. A novel structure for improving the DC breaking capacity of a fuse according to claim 1, characterized in that: The top of the electrode (3) is flattened.

3. A novel structure for improving the DC breaking capacity of a fuse according to claim 1, characterized in that: The melt (4) and the electrode (3) are welded together.

4. A novel structure for improving the DC breaking capacity of a fuse according to claim 1, characterized in that: The filler (5) is made of insulating resin.

5. A novel structure for improving the DC breaking capacity of a fuse according to claim 1, characterized in that: The filler (6) is made of quartz sand.

6. A novel structure for improving the DC breaking capacity of a fuse according to claim 1, characterized in that: The housing (2) is provided with a cavity (20) for accommodating the base (1), and a guiding inclined surface (21) for facilitating the insertion of the base (1) is provided at the opening of the cavity (20).

7. A novel structure for improving the DC breaking capacity of a fuse according to claim 1, characterized in that: The base (1) is provided with undercut bosses (11) on both sides in the width direction, the shell (2) is provided with undercut snap-in slots (22) corresponding to the positions of the undercut bosses (11), and the base (1) and the shell (2) are locked by an undercut structure.

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