Novel enclosed fuse

Abstract

The utility model relates to a novel enclosed fuse, comprising a porcelain tube, two ends of which are respectively provided with a metal layer and a connecting part connected with the metal layer. Melt bodies and an arc extinguishing medium are arranged in the porcelain tube, the melt bodies are oppositely arranged on the two sides of the porcelain tube, the two ends of the melt bodies are welded to the metal layers at the two ends of the porcelain tube respectively, and the arc extinguishing medium is arranged between the melt bodies on the two sides. According to the utility model, melt spot welding is easy, the assembly is convenient, a cover plate and a liner can be omitted, and the cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuses, and in particular relates to a novel enclosed fuse. Background Art

[0002] A fuse is a component that protects the equipment and instruments in the circuit by melting the fuse with the heat it generates or disconnecting the fuse mechanically when the current exceeds the specified value for a period of time. Fuses are widely used in high and low voltage power distribution systems and control systems, electrical equipment, and new energy vehicles. As a short circuit and overcurrent protector, they are one of the most commonly used protection devices. Fuses can be divided into pluggable fuses and hook fuses based on the way the contact blade is connected to the circuit. They can be divided into naked type, semi-enclosed type, and fully enclosed type based on the structure. They can also be divided into filled fuses and unfilled fuses based on whether there is filler. For example Figure 1 The conventional enclosed fuse shown includes a porcelain tube, a cover plate, a gasket, a contact blade, a melt and an arc extinguishing medium. The melt spot welding method of this enclosed fuse is complicated, and the contact blade and the cover plate need to be connected together with screws during assembly, so the assembly process is relatively troublesome. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a novel enclosed fuse, which is easy to spot weld and assemble, and can omit a cover plate and a gasket, thereby saving costs.

[0004] In order to achieve the above object, the technical solution of the utility model is:

[0005] A new type of enclosed fuse comprises a porcelain tube, wherein both ends of the porcelain tube are respectively provided with a metal layer and a connection portion connected to the metal layer; a melt and an arc extinguishing medium are arranged in the porcelain tube, wherein the melt is relatively arranged on both sides of the porcelain tube, and both ends are respectively welded to the metal layers at both ends of the porcelain tube, and the arc extinguishing medium is arranged between the melts on both sides.

[0006] In the above-mentioned novel enclosed fuse, the connecting part comprises a cover plate and a contact knife, and the cover plate and the contact knife are integrally formed; the connecting part is connected to the two ends of the porcelain tube through the cover plate.

[0007] In the above-mentioned novel enclosed fuse, the cover plate is fixedly connected to the two ends of the porcelain tube through connecting pieces.

[0008] In the above-mentioned novel enclosed fuse, a through hole is provided on the cover plate, and a plug is provided on the through hole.

[0009] The above-mentioned novel enclosed fuse has one connecting portion connected to a DC circuit or a low-voltage AC circuit, and the other connecting portion connected to a load.

[0010] Technical effects and advantages of the utility model:

[0011] The utility model provides a new type of closed fuse, which can facilitate melt spot welding on the ceramic end face by respectively arranging metal layers at both ends of the porcelain tube, thereby greatly reducing the difficulty of welding; by integrating the cover plate and the contact knife to form a load connection part, it is convenient to assemble and disassemble, and the use of the cover plate and the gasket is omitted, saving the use cost; therefore, compared with the traditional closed square tube fuse, the closed square tube fuse of the present application has simple melt spot welding and low use cost, and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of a traditional enclosed fuse;

[0013] Figure 2 It is a structural schematic diagram of embodiment 1 of the utility model;

[0014] Figure 3 It is a structural schematic diagram of embodiment 2 of the utility model;

[0015] Figure 4 This is one of the structural diagrams of Embodiment 3 of the present utility model;

[0016] Figure 5 This is the second structural diagram of embodiment 3 of the present utility model.

[0017] Numbers in the figure: 1, connecting part; 2, connecting piece; 3, porcelain tube; 4, arc extinguishing medium; 5, plug; 6, metal layer; 7, melt. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below with reference to the embodiments given in the accompanying drawings.

[0019] Example 1

[0020] See also Figure 2 As shown, a new type of enclosed fuse is a square fuse, which includes a porcelain tube 3, and metal layers 6 are respectively provided at both ends of the porcelain tube 3, and the metal layers 6 completely cover the two end surfaces of the porcelain tube 3, and connecting parts 1 are respectively connected to the two ends of the porcelain tube 3, and the connecting parts 1 are connected to the metal layer 6; a melt 7 and an arc-extinguishing medium 4 are provided in the porcelain tube 3, and the melt 7 is relatively arranged on both sides of the porcelain tube 3, and the two ends are respectively welded to the metal layers 6 at the two ends of the porcelain tube 3, and the arc-extinguishing medium 4 is arranged between the melts 7 on both sides.

[0021] Preferably, the present application provides metal layers 6 at both ends of the porcelain tube 3, thereby facilitating spot welding of the melt 7 on the ceramic end surface, greatly reducing the difficulty of welding.

[0022] Preferably, the connection part 1 includes a cover plate and a contact blade, and the cover plate and the contact blade are integrally formed. By integrally forming the cover plate and the contact blade, the assembly and disassembly of the fuse are facilitated, and the use of the cover plate and the gasket is omitted, thereby saving costs. During assembly, the cover plate of the connection part 1 is fixedly connected to the two ends of the porcelain tube 3 through the connector 2, so that the cover plate is connected to the metal layer 6 and the melt 7 to achieve electrical conduction.

[0023] Preferably, a through hole is provided on the cover plate, and a plug 5 is provided on the through hole.

[0024] When in use, the enclosed fuse of the present application is mainly used in a DC circuit or a low-voltage AC circuit. By connecting one end connection part 1 of the enclosed square tube fuse to the DC circuit or the low-voltage AC circuit and the other end connection part 1 to the load, the circuit can be protected from damage caused by faults such as overload and short circuit.

[0025] Example 2

[0026] join Figure 3 As shown, a new type of enclosed fuse of the present application can also be a round tube fuse, which includes a porcelain tube 3, and metal layers 6 are respectively provided at both ends of the porcelain tube 3, and the metal layers 6 completely cover the two end surfaces of the porcelain tube 3, and connecting parts 1 are also respectively connected to the two ends of the porcelain tube 3, and the connecting parts 1 are connected to the metal layer 6; a melt 7 and an arc-extinguishing medium 4 are provided in the porcelain tube 3, and the melt 7 is relatively arranged on both sides of the porcelain tube 3, and the two ends are respectively welded to the metal layers 6 at the two ends of the porcelain tube 3, and the arc-extinguishing medium 4 is arranged between the melts 7 on both sides.

[0027] The connecting part 1 is a cap structure, which is sleeved on both ends of the porcelain tube 3, and the bottom of the inner cavity is connected to the metal layer 6.

[0028] Example 3

[0029] See also Figure 4 , Figure 5 As shown, the difference between this embodiment and embodiment 1 and embodiment 2 is that the metal layer 6 does not completely cover the two end surfaces of the porcelain tube 3, but only partially covers it to facilitate spot welding of the melt 7. The rest of the structure is the same as that of embodiment 1 and embodiment 2.

[0030] The working principle of the utility model is as follows: the external overload or short-circuit fault current flows through the fuse 7 through the contact knife. When the high current passes through, the resistance heating phenomenon will occur, causing the temperature of the fuse 7 to rise. When the temperature of the fuse 7 rises to a certain degree, it will thermally melt and disconnect the circuit to protect the safety of the electrical appliance. Compared with the traditional closed square tube fuse, the contact knife and cover plate of the closed square tube fuse provided by the present application are of an integrated design, which is easy to assemble and disassemble. The fuse can be welded on the ceramic end face, which reduces the difficulty of welding, eliminates the use of cover plates and gaskets, and saves costs.

[0031] It should be noted that common application scenarios of the enclosed fuse of the present application include household circuits, industrial control systems, semiconductor current-carrying devices, power systems, electrical equipment, etc.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A new type of enclosed fuse, characterized in that: The invention comprises a porcelain tube (3), wherein two ends of the porcelain tube (3) are respectively provided with a metal layer (6), and a connection portion (1) connected to the metal layer (6); a melt (7) and an arc extinguishing medium (4) are provided in the porcelain tube (3), the melt (7) is arranged on two sides of the porcelain tube (3) relative to each other, and the two ends are respectively welded to the metal layers (6) at the two ends of the porcelain tube (3), and the arc extinguishing medium (4) is arranged between the two sides of the melt (7).

2. A new enclosed fuse according to claim 1, characterized in that: The connecting part (1) comprises a cover plate and a contact knife, and the cover plate and the contact knife are integrally formed; the connecting part (1) is connected to both ends of the porcelain tube (3) via the cover plate.

3. A new enclosed fuse according to claim 2, characterized in that: The cover plate is fixedly connected to the two ends of the porcelain tube (3) via a connecting piece (2).

4. A new enclosed fuse according to claim 2, characterized in that: A through hole is provided on the cover plate, and a plug (5) is provided on the through hole.

5. A new enclosed fuse according to any one of claims 1 to 4, characterized in that: One end connection part (1) of the fuse is connected to a DC circuit or a low-voltage AC circuit, and the other end connection part (1) is connected to a load.

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