CN201576645U - A top cap of a fuse - Google Patents

Abstract

The utility model discloses an upper cap of a fuse, which comprises a cap body, a conductive rod is installed in the cap body, and the cap body and the upper end of the conductive rod are fixedly connected together. The cap body is provided with an internal thread matched with the upper part of the fuse. Or the cap body is provided with an external thread matched with the upper part of the fuse. On the other hand, the upper part of the fuse is provided with a matching internal thread. This embodiment is very convenient for the processing of the top cap on the fuse, and can be molded at one time, making the manufacture simpler. There are grains on the outside of the cap body. The upper cap of the fuse with this structure has reasonable structure and small contact resistance, and is suitable for use on various drop-out fuses, which helps to improve the working reliability of the fuse.

Description

A top cap of a fuse

technical field

The utility model relates to an upper cap of a fuse in a power supply line.

Background technique

In high-voltage power transmission lines, drop-out fuses are generally used as overcurrent protection devices. When the transmission line or electrical equipment fails and causes a short circuit, the large short-circuit current will blow the fuse in the fuse, thereby protecting the electrical equipment and transmission line. There is generally a structural defect in the widely used high-voltage fuses at present, that is, traditionally, the connection between the top cap and the conductive rod is connected by mechanical crimping. This connection method will increase the contact resistance between the upper cap and the conductive rod, and it will inevitably generate heat when the current passes through. In this way, the basic temperature of the fuse is increased, which is equivalent to reducing the high current passing capacity of the fuse. The direct consequence of this is that the fuse is more likely to blow, and more manpower and material resources are required for line maintenance.

Utility model content

The technical problem to be solved by the utility model is to provide an upper cap of a fuse with a reasonable structure and a small contact resistance in view of the above-mentioned deficiencies.

In order to solve the above technical problems, the upper cap of the fuse includes a cap body, and a conductive rod is installed in the cap body, and its structural feature is that the cap body and the upper end of the conductive rod are fixed together.

The upper cap of the fuse in this structure adopts an integrated structure to achieve a small contact resistance. The one-piece structure mainly means that the cap body and the conductive rod are integrated, which can be molded or welded into an integrated structure. Therefore, the contact resistance of the cap body and the conductive rod will be very small, almost zero, and the conduction is very reliable. In this way, not only The working stability of the fuse is guaranteed, and the crimping ring for crimping the conductive rod is omitted, which saves the cost and helps to reduce the operating cost of the transmission line.

As an embodiment, the cap body is provided with an internal thread that cooperates with the upper part of the fuse.

The top cap of the traditional fuse adopts the internal thread connection method, so the internal thread is provided in the cap body of the top cap, which can be used together with the traditional fuse, and it is more convenient to use.

As another embodiment, the cap body is provided with an external thread that cooperates with the upper part of the fuse.

In this embodiment, an external thread is provided on the cap body, and a matching internal thread is provided on the upper part of the fuse. This embodiment is very convenient for the processing of the top cap on the fuse, and can be formed at one time, making the manufacture easier.

As an improvement, the outside of the cap is provided with hemp lines.

Setting hemp on the outside of the cap body can facilitate the operator to tighten the upper top cap of the fuse and the upper part of the fuse, which can not only improve work efficiency, but also ensure the reliability of the electrical connection between the upper top cap of the fuse and the upper part of the fuse .

To sum up, the upper cap of the fuse with this structure has a reasonable structure and low contact resistance, and is suitable for use on various drop-out fuses, which helps to improve the working reliability of the fuse.

Description of drawings

The utility model is described in further detail in conjunction with accompanying drawing:

Figure 1 is a schematic structural view of a top cap on a conventional fuse;

Fig. 2 is a schematic structural view of the first embodiment of the utility model;

Fig. 3 is a structural schematic diagram of the second embodiment of the utility model.

In the figure: 1 is the cap body, 2 is the conductive rod, 3 is the internal thread, 4 is the external thread, 5 is the hemp pattern, 6 is the upper fixing part, 7 is the fuse tube, 8 is the fuse, 9 is the rain shield .

Detailed ways

Embodiment 1, as shown in Figure 2, is a schematic structural diagram of the upper cap of the fuse, the upper cap of the fuse includes a cap body 1, the cap body 1 is in the shape of a cover with the opening downward, and the inside of the cap body 1 The middle part of the cavity is provided with a conductive rod 2, and the top surface of the inner cavity of the cap body 1 is fixedly connected with the upper end of the conductive rod 2. In this way, the cap body 1 and the conductive rod 2 become an integral structure. When the integrated upper cap is processed, It can be molded by casting or welded by welding. Because the cap body 1 and the conductive rod 2 are fixedly connected together, the connection resistance is small, it will not generate a lot of heat like the top cap on the traditional fuse shown in Figure 1, and it will not affect the fuse 8, which greatly improves the safety performance of the fuse. job stability. The inner cavity of the cap body 1 is provided with an internal thread 3 cooperating with the upper part of the upper fixing part 6 of the fuse, and the lower part of the upper fixing part 6 is fixedly connected with the upper part of the fuse tube 7 . The outer side of the cap body 1 is provided with hemp lines 5, through which the upper top cap of the fuse and the upper part of the upper fixing member 6 can be easily screwed together, without carrying special tools, which reduces the burden on the operator.

Specific Embodiment 2 As shown in Figure 3, the difference between the top cap of this structural fuse and the specific embodiment 1 is that the upper fixing member 6 is provided with internal threads, and the cap body 1 is provided with an external thread that matches it. Thread, the upper cap of the fuse with this structure is simpler to manufacture than the first embodiment, which helps to improve production efficiency and reduce costs. In order to prevent rainwater from flowing into the fuse tube 7 from the connecting portion between the upper top cap and the upper fixing member 6 , a rain-shielding portion 9 is provided on the outer lower portion of the cap body 1 .

Claims (4)

1. the last top cap of a fuse comprises cap body (1), and conducting rod (2) is installed in the cap body (1), it is characterized in that: cap body (1) is fixed together with conducting rod (2) upper end.

2. the last top cap of fuse as claimed in claim 1 is characterized in that: be provided with the internal thread (3) that cooperates with fuse top in the cap body (1).

3. the last top cap of fuse as claimed in claim 1, it is characterized in that: cap body (1) is provided with the external screw thread (4) that cooperates with fuse top.

4. as the last top cap of claim 1,2 or 3 described fuses, it is characterized in that: cap body (1) outside is provided with numb line (5).

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