CN209896019U

CN209896019U - Tubular fuse

Info

Publication number: CN209896019U
Application number: CN201920727069.2U
Authority: CN
Inventors: 南式荣; 杨漫雪; 周家兴; 黄云; 丁灵俊
Original assignee: Nanjing Sart Science and Technology Development Co Ltd
Current assignee: Nanjing Sart Science and Technology Development Co Ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-01-03
Anticipated expiration: 2029-05-21

Abstract

The utility model discloses a tubular fuse, which comprises a tubular main body, end caps positioned at two ends of the tubular main body, a fuse wire and soldering tin positioned in the tubular main body; wherein, the end surface of the tubular main body is provided with salient points, so that a soldering tin accumulation space is reserved between the end surface of the tubular main body and the inner surface of the end cap. In the welding process, because soldering tin expansion rate is fast, tubular main part expansion rate is slow, accumulational soldering tin can expand to tubular main part direction, forms tight fit with the end cap internal surface, improves the leakproofness of fuse.

Description

Tubular fuse

Technical Field

The utility model relates to a circuit protection component, concretely relates to tubulose fuse.

Background

As shown in fig. 1, the conventional tubular fuse is connected to a tubular body 1 ', an end cap 2 ' and a fuse wire 3 ' by soldering. However, the solder 4 ' cannot be uniformly and densely filled between the tubular body 1 ' and the end cap 2 ' due to poor welding performance between the tubular body 1 ' and the end cap 2 '. And the end cap 2 ', the solder 4 ' and the tubular body 1 ' are heated during the soldering process. Due to the difference in thermal expansion coefficient, the tubular body 1 ' has the smallest expansion coefficient, and the soldering tin 4 ' and the end cap 2 ' will be far away from the tubular body during heating, so that a gap exists between the tubular body 1 ' and the end cap 2 ', and the sealing cannot be completed. Therefore, when the tubular fuse is welded on the circuit board, part of the soldering tin 4 ' is immersed into the porcelain tube through the gap between the tubular main body 1 ' and the end cap 2 ', and the overall performance of the fuse is affected.

Disclosure of Invention

The purpose of the invention is as follows: the utility model discloses a have better sealing performance's tubulose fuse between end cap and the tubulose main part.

The technical scheme is as follows: in order to achieve the above object, the utility model discloses can adopt following technical scheme:

a tubular fuse comprises a tubular main body, end caps positioned at two ends of the tubular main body, a fuse wire and soldering tin positioned in the tubular main body; the fuse wire is characterized in that a plurality of salient points are arranged on the end face of the tubular main body and abut against the inner surface of the end cap, so that a space for accommodating soldering tin is formed between the inner surface of the end cap and the end face of the tubular main body.

Furthermore, the cross section of the tubular main body is square, and four corners of the square end face of the tubular main body are respectively provided with a salient point. Or the tubular main body is in a circular tube shape, and a plurality of salient points uniformly surrounding the circumference are formed on the circular end surface of the tubular main body.

Furthermore, the connecting part of the side surface and the end surface of the tubular main body forms a partial inclined surface, the end cap also comprises a side wall wrapping the side surface of the tubular main body, and a space for accommodating soldering tin is also formed between the inner surface of the side wall and the inclined surface.

Further, the salient points are cylindrical salient points.

Furthermore, the end faces of the two ends of the tubular main body are provided with salient points.

Has the advantages that: the tubular fuse is provided with the salient points on the end face of the tubular main body, so that a soldering tin accumulation space is reserved between the end face of the tubular main body and the inner surface of the end cap. In the welding process, because soldering tin expansion rate is fast, tubular main part expansion rate is slow, accumulational soldering tin can expand to tubular main part direction, forms tight fit with the end cap internal surface, improves the leakproofness of fuse.

Drawings

FIG. 1 is a schematic cross-sectional view of a prior art tubular fuse;

FIG. 2 is a schematic cross-sectional view of the tubular fuse of the present invention;

FIG. 3 is a schematic structural view of the tubular body of the tubular fuse of the present invention;

fig. 4 is an end elevational view of the end cap.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail and completely in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 2, the present embodiment discloses a tubular fuse including a tubular body 1, an end cap 2, a fuse wire 3, and a solder 4. The shape and the cavity of the tubular main body 1 are both square tubes or round tubes, and the end caps 2 are square end caps sleeved at two ends of the tubular main body 1. The fuse wire 3 is positioned in the cavity of the tubular body 1, and two ends of the fuse wire are fixed in the middle of the end caps 2 through soldering tin 4 and are communicated with the end caps 2 at two ends.

Referring to fig. 3, in order to improve the sealing performance of the tubular fuse, a bump 5 is disposed on an end surface of the tubular main body 1, and in the present embodiment, the bump 5 is a cylindrical bump. The end cap 2 is sleeved on the tubular main body 1, and the salient points 5 are abutted to the end face of the end cap 2, so that a stacking space for accommodating soldering tin 4 is formed between the inner surface of the end cap 2 and the end face of the tubular main body 1. In the welding process, because the expansion speed of the soldering tin 4 is high, the expansion speed of the tubular main body 1 is low, the soldering tin 4 accumulated in the accumulation space can expand towards the direction of the tubular main body 1 and form tight fit with the end face of the tubular main body 1, and the sealing performance of the fuse is improved. In addition, the solder 4 expanded from the end face can be accommodated between the end cap 2 and the tubular body 1 with a certain space. The connecting position of the side surface and the end surface of the tubular main body 1 forms a partial inclined surface 6, the end cap 2 also comprises a side wall 7 wrapping the side surface of the tubular main body 1, and a space for accommodating soldering tin is also formed between the inner surface of the side wall 7 and the inclined surface 6.

Specifically, as shown in fig. 3 and 4, 4 cylindrical protrusions 5 are provided on the upper and lower end surfaces of the tubular body 1, respectively. The salient points 5 are respectively positioned at the pressing parts of the upper end surface and the lower end surface of the tubular main body 1 and the inner surface of the end cap 2. Thereby when establishing end cap 2 cover on tubulose main part 1, can support four symmetric positions at tubulose main part 1 terminal surface respectively through these 4 bumps 5, make to form more even soldering tin between the internal surface of end cap 2 and the terminal surface of tubulose main part 1 and pile up the space, avoid piling up at certain position soldering tin 4 and cause the cooperation between tubulose main part 1 and the end cap 2 to produce the slope error. The sealing performance after welding is further improved.

Another embodiment is: the tubular body is designed cylindrical (not shown) and the end faces are circular. A plurality of salient points uniformly surrounding a circle are formed on the circular end surface of the tubular main body. The bumps also form a stacking space with the inner surface of the end cap for accommodating solder, which is not described in detail herein.

Claims

1. A tubular fuse comprises a tubular main body, end caps positioned at two ends of the tubular main body, a fuse wire and soldering tin positioned in the tubular main body; the fuse wire is characterized in that a plurality of salient points are arranged on the end face of the tubular main body and abut against the inner surface of the end cap, so that a space for accommodating soldering tin is formed between the inner surface of the end cap and the end face of the tubular main body.

2. The tubular fuse as claimed in claim 1, wherein the tubular body has a square cross-section, and wherein the four corners of the square end surface of the tubular body are each provided with a convex point.

3. The tubular fuse as claimed in claim 1, wherein the tubular body is a circular tube, and a plurality of protrusions are formed on a circular end surface of the tubular body to surround the circular tube uniformly.

4. A tubular fuse as claimed in claim 1, 2 or 3 wherein the junction of the side and end surfaces of the tubular body forms part of a chamfer and the end cap further has a side wall surrounding the side surface of the tubular body, the side wall having an inner surface and the chamfer forming a space therebetween for receiving solder.

5. The tubular fuse as claimed in claim 4, wherein the projection is a cylindrical projection.

6. The tubular fuse as claimed in claim 1, wherein the tubular body has a protruding point on both end faces.