KR101098660B1

KR101098660B1 - Fuse and the manufacturing method thereof

Info

Publication number: KR101098660B1
Application number: KR1020100025344A
Authority: KR
Inventors: 정종일; 강두원; 안규진; 김성광; 진상준; 김현창; 이경미
Original assignee: 스마트전자 주식회사
Priority date: 2010-03-22
Filing date: 2010-03-22
Publication date: 2011-12-23
Also published as: KR20110106111A

Abstract

Disclosed are a fuse and a method of manufacturing a fuse, in which the fusing element may have a constant number of turns and lengths, and a failure rate may be reduced while preventing the junction between the fusing element and the lead wire from being broken. Such a fuse includes a rod, a metal cap which is respectively covered at both ends of the rod, and a pair of lead wires are joined to each other, and a fusing element bonded to each metal cap at each end and wound on the rod. Metal caps are respectively attached to both ends of the rod, and the lead wires are bonded to the metal caps, the fusing elements are wound on the rods, and both ends of the fusing elements are joined to the metal caps.

Description

Fuse and its manufacturing method

The present invention relates to a fuse and a method of manufacturing the same, and more particularly, to a fuse and a method of manufacturing the same that can prevent the junction between the lead wire and the fusing element is broken.

In general, there is a possibility that a very high voltage is applied to a communication device connected to a telephone line or the like due to a surge current caused by induced lightning or when the telephone line is in contact with a power line.

For this reason, the fuse used for a communication device requires a high time-lag characteristic to prevent it from being melted by the surge current by an induction lightning, as well as the high breaking capability characteristic which cuts off the current which breaks a communication device safely.

As shown in FIG. 1, a conventional fuse includes a base 1 having a pair of fastening holes 1a and a pair of lead wires installed in the base 1 to penetrate the fastening holes 1a. (2) and the fusing element 3 for connecting and connecting the ends of the lead wires 2 above the base 1 so as to cover the fusing element 3 bonded between the lead wires 2; It has a case 4 coupled to the base 1.

At this time, the fusing element 3 is usually wound on a support 5 made of glass fiber, and then cut into a predetermined length together with the support 5, and the annular fixing portion 2a formed on the upper end of the lead wire 2. ) And then bonded to the fixing portion (2a) by soldering.

However, in the conventional fuse, the fusing element 3 should have a good number of turns and lengths to have excellent resistance distribution and melt spread, and the fusing element 3 is soldered when soldering the lead wire 2 and the fusing element 3 to each other. ) Causes a problem that does not have a constant number of turns and length.

The fuse passes through a high temperature solder bath when the fuse is mounted on a substrate. In this case, the solder 6 between the fusing element 3 and the lead wire 2 is dissolved to fuse the fusing element 3 and the lead wire 2. ) May cause a poor bonding.

In addition, Republic of Korea Patent No. 10-0929822 discloses a fuse and a method for manufacturing the same filed by the present applicant. The disclosed fuse is directly bonded to the lead wire using the arc welding, the fusing device can have a constant number and length of turn and reduce the failure rate.

However, the disclosed fuse may be broken by thermal curing of the junction between the fusing element and the lead wire due to direct arc welding. In addition, since the fuse is not supported by the support, the disclosed fuse may impact the fusing element when the filler, such as sand, is filled in the internal space formed by the combination of the base and the cover.

An object of the present invention is a fuse and a method of manufacturing a fuse that can have a constant number of turns and length, while reducing the failure rate while preventing the fusing element from being damaged when the fusing element and the lead wire and the filling material is ruined To provide.

The fuse of the present invention for achieving the above object comprises a base, a pair of lead wires installed on the base, and a fusing element unit connecting the ends of the lead wires,

The fusing element unit includes a rod, a metal cap which is respectively covered at both ends of the rod, and a pair of lead wires are joined to each other, and a fusing element wound at the rod by joining each end to each of the metal caps.

The pair of lead wires and the fusing element are arc welded to the metal cap.

The fusing element unit is coated with a nonflammable paint.

The base is coupled to the cover to accommodate the pair of lead wires and the fusing element unit therein,

In the space formed by the combination of the base and the cover, a filler is provided to absorb the explosion when the fusing device unit is exploded.

A base to achieve the above object; A pair of lead wires installed in the base; A fuse manufacturing method according to the present invention includes a fusing element unit including a rod, a metal cap respectively disposed on both ends of the rod, and a fusing element connecting the ends of the lead wires.

Put the metal caps on both ends of the rod,

Bonding each of the lead wires to the metal cap;

Winding the fusing element to the rod and bonding both ends of the fusing element to the metal cap, respectively.

After the fusing element is wound on the rod and bonded to each metal cap, the fusing element unit may further include coating the fusing element unit with a non-flammable paint.

After the non-flammable coating is coated on the fusing element unit,

Bending each of the lead wires,

Each bent lead wire is installed in the base by insert injection,

Further comprising coupling a cover to the base.

Filling the filler in the inner space of the base in the process of coupling the cover to the base.

As described above, the fuse and the method of manufacturing the fuse of the present invention is a rod, a metal cap which is covered on both ends of the rod and the pair of lead wires are bonded, and each end is bonded to each metal cap By having a fusing element unit including a fusing element wound on the rod, the number of turns and length of the fusing element can be kept constant and the defect rate between the fusing element and the lead wire can be prevented and the fillers can be prevented from being damaged. It is possible to prevent the fusing element from being damaged during filling.

1 is a perspective view showing a conventional fuse.
Figure 2 is a perspective view of the fuse of the present invention.
3 is a cross-sectional view illustrating the fuse of FIG. 2.
4A to 4H are views for explaining a method of manufacturing a fuse of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 and 3, the fuse of the embodiment of the present invention, a rectangular base 10, a pair of lead wires 20, which are installed by injection molding on the base 10, and the base 10 And a fusing element unit 30 for connecting and connecting the upper ends of the lead wires 20 passing through the cover), and a cover 40 coupled to the base 10.

First, the base 10 is coupled so that the lower end of the cover 40 is fitted outside the outer edge of the base 10. In addition, the base 10 may be coupled to each other by having a cover 40 and a conventional coupling protrusion and coupling groove, respectively. Accordingly, the inner space formed by the combination of the base 10 and the cover 40 is insert injection molded into the fusing element unit 30 and the base 10 so that a part of the lead wire 20 penetrating the base 10 may be formed. It is provided to be accommodated.

The upper ends of the pair of lead wires 20 are connected by the fusing element unit 30 as described above. At this time, each lead wire 20 is directly bonded to each other by the arc welding to the metal cap 33 to be described later of the fusing element unit 30.

The fusing element unit 30 serves to connect and connect the respective lead wires 20 as described above. The fusing element unit 30 includes a rod 31, a metal cap 33 which is covered on both ends of the rod 31, and a pair of lead wires 20 are joined to each of the metal caps 33, respectively. An end is joined and includes a fusing element 35 wound on the rod 31.

Rod 31 is disposed between the top of each lead wire 20 as shown. The rod 31 is made of a ceramic material and can be changed to Time-Lag or Fast acting because the fusing element unit 30 can adjust the heat release amount by adjusting the AlO content (30% to 93%).

As described above, the metal caps 33 are respectively attached to both ends of the rod 31. Each of these metal caps 33 is joined to the upper end of the pair of lead wires 20, respectively. At this time, the joining of the metal cap 33 and the lead wire 20 uses arc welding.

The fusing element 35 is wound on the outer surface of the rod 31 as described above. As described above, both ends of the fusing element 35 wound on the outer surface of the rod 31 are bonded to each metal cap 33 as shown. At this time, the joining of the metal cap 33 and the fusing element 35 uses arc welding. In addition, since the fusing element 35 of the present invention is not bonded by soldering, the number and length of turns of the fusing element 35 are constant, so that the resistance value distribution and the melt spreading are excellent.

Further, in the present invention, the fusing element unit 30 including the rod 31, the metal cap 33, and the fusing element 35 is coated by a non-flammable paint 37. Coating the fusing element unit 30 using the non-flammable paint 37 as described above protects the fusing element unit 30 and prevents the fusing element unit 30 from igniting when the fusing element unit 30 is overloaded. To do this.

The non-combustible paint 37 may be a paint in which alumina (AlO) and silica (SiO ₂ ) are mixed with a low risk of ignition. At this time, the alumina has a characteristic that can control the heat transfer rate according to its content, the fusing element unit 30 of the present invention controls the heat transfer rate of the fusing element 35 according to the content of the alumina of the non-combustible paint (37). Therefore, the melting timing of the fusing element 35 can be adjusted.

In the present invention, a pair of lead wires 20 and the fusing element unit 30 installed therein, which are installed through the base 10, that is, the inner space formed by the coupling of the base 10 and the cover 40 are accommodated. The space may be filled with a filler 15 such as sand. The filler 15 absorbs the explosive force when the load is applied to the fusing element unit 30.

In addition, in the present invention, the filler as described above is because the fusing element 35 is supported by the rod 31 and the fusing element unit 30 including the fusing element 35 is coated by a non-combustible paint 37 to the base ( 10) may not be filled in the inner space formed by the combination of the cover 40.

Hereinafter, a method of manufacturing the fuse of the present invention will be described in detail.

In order to manufacture the fuse, first, a rod 31 made of ceramic material is cut to a predetermined length (see FIG. 4A), and metal caps 33 are respectively covered on both ends of the cut rod 31 (see FIG. 4B). After covering the metal cap 33, a pair of lead wires 20 are bonded to each metal cap 33 by arc welding (see FIG. 4C).

In addition, after the pair of lead wires 20 are bonded to the metal caps 33, the fusing element 35 is wound on the ceramic rod 31, and the fusing element wound on the rod 31 in this manner. Both ends of the 35 are joined to each metal cap 33 by arc welding (see Fig. 4D).

Next, after the fusing element 35 is wound on the rod 31 and bonded to each metal cap 33, the fusing element unit including all of the rod 31, the metal cap 33, and the fusing element 35 ( 30) is coated with a non-flammable paint 37 (see Fig. 4e).

In addition, after coating the non-flammable coating 37 on the fusing element unit 30, each lead wire 20 is bent (see FIG. 4F), and each lead wire 20 bonded to the fusing element unit 30 is bonded. The base 10 is installed by injection molding (see FIG. 4G).

Then, after installing the lead wires 20 on the base 10, the cover 40 is coupled, and thus, the filler 15, such as sand, is bonded in the process of coupling the cover 40 to the base 10. The filling of the internal space formed by the combination of the 10 and the cover 40 completes the manufacture of the fuse (see FIG. 4H).

Therefore, in the present invention, the fusing element unit 30 is a rod 31, the metal cap 33 is covered on both ends of the rod 31, the fusing element wound on the rod 31 and bonded to the metal cap 33 By including the (35), unlike the prior art that the lead wire 20 and the fusing element 35 is bonded by soldering, the fusing element 35 can have a certain number of turns and length and the defect of the fusing element 35 The incidence can be reduced.

In addition, unlike the conventional fusing device unit 30 of the present invention, the rod 31 is made of a ceramic material and the support for supporting the fusing device 35 is made of glass fiber, so that the thermal conductivity is controlled to damage the fusing device 35. Can be prevented.

Further, the fusing element unit 30 of the present invention is different from the conventional one in which the fusing element 35 and the lead wire 20 are directly bonded by arc welding. Since the lead wire 20 and the fusing element 35 are bonded to each other, it is possible to prevent the bonding portion from being damaged due to thermal curing.

In addition, the fusing element unit 30 of the present invention, because the fusing element 35 is wound on the rod 31 and coated by a non-flammable paint 37, unlike the conventional support that is not provided with the base 10 and the cover When the filler 15 is filled in the internal space formed by the coupling of the 40, it is possible to prevent the impact of the fusing element 35 from being applied.

10: base 15: filling material
20: lead wire 30: fusing element unit
31: rod 33: metal cap
35: fusing element 37: non-flammable paint
40: cover

Claims

A base, a pair of lead wires installed on the base by insert injection molding, and a fusing element unit connecting one end of the pair of lead wires,
The fusing element unit is formed of a ceramic rod, a metal cap which is respectively covered at both ends of the rod, and the pair of lead wires are arc welded, respectively, and is wound on the rod and each end is arc welded to each metal cap. Including a fusing element having a constant length and number of turns,
And a fusing element unit comprising the rod, the metal cap, and the fusing element is coated with a non-flammable paint.

delete

The method of claim 1,
A cover is coupled to the base to accommodate the pair of lead wires and the fusing element unit.
A fuse formed in the space formed by the combination of the base and the cover is provided with a filler for absorbing the explosion during the explosion of the fusing element unit.

Put metal caps on both ends of the rod of ceramic material,
Arc welding the lead wire to each of the metal caps,
Winding a fusing element having a constant length and number of turns to the rod,
Arc welding the both ends of the fusing element wound on the rod to each of the metal caps,
Coating a non-flammable coating on the fusing element unit including the rod, the metal cap and the fusing element,
Bending the pair of lead wires,
The bent lead wire is installed in the base by insert injection,
A method of manufacturing a fuse comprising coupling a cover to the base.

delete

The method of claim 5,
And a filler filling the inner space of the base in the process of coupling the cover to the base.