KR101463710B1 - Fuse of double tube structure and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a fuse having a double pipe structure and a manufacturing method thereof, and more particularly, to a double-pipe fuse having a double pipe structure of an inner tube and an outer tube to improve durability and reduce the risk of explosion, will be.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fuse having a double-

The present invention relates to a fuse having a double pipe structure and a manufacturing method thereof, and more particularly, to a double-pipe fuse having a double pipe structure of an inner tube and an outer tube to improve durability and reduce the risk of explosion, will be.

Generally, a fuse must be fused constantly over a reliable and defined current and voltage range, as current exceeding a prescribed value is applied for a predetermined time and then fused by heat to open the circuit to protect the product or part.

In addition, the fuse includes a fuse, a plate fuse having a ring-shaped hook at both ends thereof made of light metal, a can-type fuse having a fuse wire inserted in the cylinder, a plug having a fuse inside the plug, Fuses and the like.

10, a conventional tubular fuse disclosed in Korean Patent Publication No. 1992-0007019 (published on Apr. 28, 1992) discloses that a filament 2 is inserted into a glass tube 1, And a metallic cap 3 having internal leads 4 attached to both ends thereof.

In the conventional tubular fuse, as shown in FIG. 11, since the filament is inserted into the glass, only the filament is melted at the rated breaking capacity or lower, so that the flame or arc can be safely protected without discharging the flame or arc to the outside. Here, the rated breaking capacity means the maximum current value that safely cuts off the current while protecting the peripheral component or circuit when an abnormal current is applied to the fuse.

However, when an overcurrent exceeding the breaking capacity is instantaneously applied, the filament is blown up to the glass tube as well as the filament, so that peripheral parts are damaged or the risk of fire is increased.

Accordingly, it is an object of the present invention to provide a fuse having a double pipe structure which can improve the durability and reduce the risk of explosion due to the double pipe structure of the inner tube and the outer tube, And a manufacturing method thereof.

It is another object of the present invention to provide a fuse having a double pipe structure and a method of manufacturing the same, which can reduce the risk of explosion by absorbing the impact or energy of the fuse wire when the fuse wire is blown,

It is also an object of the present invention to provide a method of manufacturing a semiconductor device in which an inner tube is inserted into a cap and a plurality of annularly arranged coupling protrusions are formed so that the solder can be uniformly distributed in the cap and the distance between the inner tube and the outer tube And to provide a method of manufacturing the fuse.

To this end, the fuse of the double pipe structure according to the present invention comprises an outer tube; An inner tube inserted into the outer tube; A fusible wire inserted into the inner tube; A first cap provided at one end of the outer tube and electrically connected to the fusible wire; And a second cap provided at the other end of the outer tube and electrically connected to the fusible wire.

In addition, an outer space portion is formed between the outer tube and the inner tube of the double pipe structure fuse according to the present invention, and the filler is filled in the outer space portion.

Further, the inner tube of the double-pipe fuse according to the present invention is characterized in that the filler is filled.

In addition, joints are formed at both ends of the outer tube of the double-pipe fuse according to the present invention in order to increase the bonding force when soldering to the cap.

In addition, joints are formed at both ends of the inner tube of the double-pipe fuse according to the present invention in order to increase the bonding force when soldering to the cap.

The fuse of the double pipe structure according to the present invention is characterized in that both ends of the inner tube and the outer tube are provided with joints to increase the bonding force when soldering to the cap.

The joint portion of the fuse of the double pipe structure according to the present invention is characterized by comprising a base material directly bonded to the surface of the outer tube or the inner tube and a plating portion formed on the surface of the base material.

In addition, a coupling portion is formed on a bottom surface of the cap of the double-pipe fuse according to the present invention so that the inner tube can be fitted into the cap.

In addition, the coupling portion of the double-pipe fuse according to the present invention is characterized by having a plurality of coupling protrusions arranged in an annular shape and spaced apart from each other by a predetermined distance.

The coupling portion of the fuse of the double pipe structure according to the present invention is characterized by comprising a plate-shaped support portion inserted and fixed to the bottom surface of the cap, and a plurality of coupling protrusions arranged annularly on the support portion.

Further, the side surface of the cap of the double-pipe fuse according to the present invention has a polygonal structure so as not to move when the surface is mounted.

The first cap or the second cap of the double-pipe fuse according to the present invention is formed in a cylindrical shape. On the first cap or the second cap, a surface mounting cap Are combined.

In addition, the present invention provides a fuse having a double pipe structure according to the present invention, wherein the fuse includes a first cap and a second cap; Inserting the fusible wire into the inner tube; Placing the inner tube and the outer tube on the first cap, and heating and soldering the first cap; A plurality of coupling protrusions are formed in a bottom surface of the first cap, the coupling protrusions being disposed in an annular shape, and the step of S1 The solder melted in the first cap moves through a space formed between the coupling protrusions and is uniformly distributed on the bottom surface of the first cap. In step S3, the inner tube is seated in the coupling protrusion .

Further, in step S3 of the double pipe structure according to the present invention, the inner tube and the outer tube are seated on the first cap, and then the filler is filled in the outer tube formed between the inner tube and the outer tube. Further comprising the steps of:

According to the fuse of the double pipe structure and the method of manufacturing the same according to the present invention having the above-described structure, since the double pipe structure of the inner tube and the outer tube is formed, durability is improved and explosion risk is reduced.

In addition, according to the fuse of the double pipe structure and the method of manufacturing the same according to the present invention, by injecting the filler into at least the outer circumferential portion, the risk of explosion can be remarkably reduced by absorbing the impact or energy at the time of explosion of the fusible wire.

According to the fuse of the double pipe structure and the method of manufacturing the same according to the present invention, by forming a plurality of annularly arranged engaging projections into which the inner tube is inserted into the cap, solder can be uniformly distributed in the cap, The interval between the inner tube and the outer tube can be maintained constant.

1 is a perspective view showing a first embodiment of a double pipe structure fuse according to the present invention.
2 is an exploded perspective view showing a first embodiment of a double-pipe fuse according to the present invention.
3 is a cross-sectional view showing a first embodiment of a double-pipe fuse according to the present invention.
4 is a perspective view showing a state in which a coupling protrusion is formed on a cap according to the present invention.
FIGS. 5A and 5B are cross-sectional views showing a coupling protrusion formed on a cap according to the present invention.
6 is a cross-sectional view showing a second embodiment of a double-pipe structure fuse according to the present invention.
FIG. 7A is a plan view showing a cap having a polygonal structure according to the present invention, and FIG. 7B is a view showing a surface mounting cap having a polygonal structure coupled to a cap. FIG.
FIG. 8 is a cross-sectional view showing a state in which a fuse of double pipe structure according to the present invention is surface mounted on a substrate.
Figs. 9A to 9E are views showing respective steps of a method for manufacturing a double-pipe fuse according to the present invention.
10 is a cross-sectional view showing a structure of a conventional fuse.
11 is a view showing a state where an explosion occurs when a current exceeding a breaking capacity is applied to a conventional fuse.

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

FIG. 1 is a perspective view showing a first embodiment of a double-pipe structure fuse according to the present invention, FIG. 2 is an exploded perspective view showing a first embodiment of a double-pipe structure fuse according to the present invention, Sectional view showing a first embodiment of a double-pipe structure fuse according to the first embodiment of the present invention.

1 to 3, a fuse 100 of a dual tube structure according to the present invention includes a main body 100 including an outer tube 110, an inner tube 120, a fusible wire 140, a first cap 150, and a second cap 150a.

The fusible wire 140 serves to protect the circuit by being melted by heat generated when an overvoltage or an overcurrent larger than a set value is applied. The fusible wire 140 is made of a copper alloy, silver, copper-silver alloy, nickel- Iron, an iron-based alloy containing copper, iron, chromium, and nickel as a main component, the surface of which is silver or tin-plated.

The fusible wire 140 is electrically connected to the first cap 150 and the second cap 150a while being inserted into the inner tube 120, And may be formed in a thin flat plate shape, though not shown.

The first cap 150 is provided at one end of the outer tube 110 and the second cap 150a is provided at the other end of the outer tube. A lead wire 170 may be coupled to the first cap and the second cap.

The outer tube 110 receives the inner tube 120 and has a cylindrical shape with both ends opened.

The inner tube 120 receives the fusible wire 140 and is inserted into the outer tube 110 and has a cylindrical shape with both ends opened.

The inner tube 120 and the outer tube 110 may be made of ceramics or glass.

9C) is formed between the outer tube 110 and the inner tube 120 and the pillars 117 can be filled in the outer shaft portion 115. [

The filler 117 serves to absorb explosion or impact energy generated when the fusible wire 140 is fused, and may include sand or silica.

The filler 117 may be respectively filled in the outer hollow portion 115 and the inner tube 120. In this case, durability is further improved as compared with filling only the outer hollow portion, and even if a higher overcurrent flows, Is not damaged and can be used safely.

FIG. 4 is a perspective view showing a coupling protrusion formed on a cap according to the present invention, FIGS. 5a and 5b are cross-sectional views showing a coupling protrusion formed on a cap according to the present invention, and FIG. Sectional view showing a second embodiment of a double-pipe structure fuse.

Referring to FIGS. 2 and 6, a joining part 130 made of a metal material may be formed at both ends of the outer tube 110.

The bonding portion 130 serves to increase the bonding strength when soldering to the first cap 150 and the second cap 150a and includes a base material 131 directly attached to the outer tube 110, And a plating unit 133 formed on the surface of the substrate 131.

The base material 131 may be made of manganese, molybdenum, or an alloy containing them.

The plating unit 133 may be made of nickel, silver, or an alloy containing them.

The inner tube 120 may have a joint 130a formed at both ends thereof in the same manner as the outer tube 110.

If the base material is omitted and the nickel or silver component is directly plated on the inner tube or the outer tube of the ceramic material, the plating is not performed well and the bonding force is weakened. Therefore, in the present invention, it is preferable to form the plating part on the base material after the base material is formed on the inner tube or the outer tube.

2 to 6, the bottom surface 155 of the cap 150, 150a according to the present invention may have a coupling portion 151 to allow the inner tube 120 to be fitted therein.

The engaging portion 151 serves as a spacer for guiding the position of the inner tube 120 and maintaining a gap between the inner tube 120 and the outer tube 110.

The coupling portion 151 may include at least two coupling protrusions 152 arranged in an annular shape and separated from each other by a predetermined distance.

Generally, during the manufacture of the fuse, a solid solder 160 is placed in the cap and heated to apply the solder uniformly to the bottom surface 155 of the cap 150, 150a. At this time, the space 152 spaced apart from the coupling protrusions 152 serves as a passageway for allowing the melted solder 160 to freely move inside and outside the coupling protrusions 152 in the cap. And the fusible wire 140 is also drawn out through the space 152 spaced between the engaging projections.

The engaging portion 151 may be formed on the first cap 150 and the second cap 150a, or may be formed only on the first cap 150, as the case may be.

The engaging portion 151 may be integrally formed with the cap 150 or 150a through welding or a mold as shown in FIG. 5a.

5B, the engaging portion 151 'includes a plate-shaped support portion 154 that is inserted into and fixed to the bottom surface 155 of the cap 150 and 150a, and the support portion 154 And a plurality of engaging projections 152 arranged annularly on the engaging projections 152. [

At this time, one surface of the support part 154 is soldered to the bottom surface of the cap 150, 150a, and the other surface is soldered to the inner tube 120.

When the engaging portion 151 is formed as a separate structure from the caps 150 and 150a, there is a disadvantage in that a process of inserting and fixing the engaging portion 151 into the caps 150 and 150a is added. However, The conventional cap can be used without being deformed, and the manufacturing of the engaging projection 152 is made relatively easier than the unified engaging portion.

FIG. 7A is a plan view showing a cap having a polygonal structure according to the present invention, and FIG. 7B is a view showing a surface mounting cap having a polygonal structure coupled to a cap. FIG. And FIG. 8 is a cross-sectional view showing a state in which a fuse of double pipe structure according to the present invention is surface mounted on a substrate.

Since the cap of a general fuse is formed in a cylindrical shape (see Fig. 1), it is not fixed but moves when it is placed on a substrate. Therefore, the fuse is not mounted on the surface, the cap is mounted on the socket mounted on the board, or the lead wire is bonded to the cap.

However, the caps 150 'and 150' 'of the present invention are formed in a polygonal shape with their sides as shown in FIGS. 7A and 8, so that even when the cap is raised on the solder pad 201, (Correction)

Referring to FIG. 7B, unlike the previous embodiment, the first cap 150 and the second cap 150a are formed in a generally cylindrical shape. In order to facilitate surface mounting, A surface mounting cap 180 having a polygonal structure can be coupled to the surface mounting cap 180. At this time, the surface mounting cap may be press-fitted into the first cap or the second cap.

Hereinafter, a method of manufacturing a double-tube fuse according to the present invention will be described with reference to the accompanying drawings. However, the detailed description of the same or similar components as those described above will be omitted.

FIGS. 9A to 9F are views showing respective steps of a method for manufacturing a double-pipe fuse according to the present invention.

A method for manufacturing a double-pipe fuse according to the present invention comprises steps S1 to S4.

Referring to FIG. 9A, in step S1, solder is injected into the first cap 150 and the second cap, respectively, and heated to melt the solder.

As described above, a plurality of coupling protrusions 152 arranged in an annular shape is formed on the bottom surfaces of the first cap 150 and the second cap 150a. However, the first cap (quartz) may have a coupling protrusion and the second cap may have no coupling protrusion.

Since the engaging protrusions 152 are spaced apart from each other, when the caps 150 and 150a are heated, the melted solder 160 flows through the spaced spaces 152 and is uniformly distributed on the bottom surfaces of the caps 150 and 150a. .

Referring to FIG. 9B, in step S2, the fusible wire 140 is inserted into the inner tube 120, and both ends of the fusible wire 140 are bent and fixed.

The inner tube may be provided with a joint portion composed of a base material and a plating portion.

Referring to FIG. 9C, in step S3, the inner tube 120 and the outer tube 110, into which the fusible wire 140 is inserted, are sequentially placed on the first cap 150, 150 are heated and soldered. At this time, since the inner tube 120 is inserted and seated in the plurality of annularly arranged coupling protrusions 152, the inner tube 120 is accurately positioned at the center of the outer tube 110.

On the other hand, because the soldering 160 and 160 'is performed on the end portions of the inner tube and the inner and outer surfaces thereof, the bonding force can be greatly improved.

Referring to FIG. 9D, in step S3, the pores 117 may be filled in the outer hollow part 115 formed between the inner tube 120 and the outer tube 110, in step S3-1.

Referring to FIG. 9E, in step S4, the second cap 150a is inserted into the outer tube 110, and the second cap 150a is heated and soldered.

As described above, according to the method for manufacturing a double-pipe fuse according to the present invention, the interval between the inner tube and the outer tube can be maintained constant through the annular coupling projections formed in the cap. Also, since the area where the inner tube and the outer tube contact with the solder increases due to the coupling protrusion, there is an advantage that the bonding force can be improved.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. Accordingly, the scope of the present invention should be construed as being limited to the embodiments described, and it is intended that the scope of the present invention encompasses not only the following claims, but also equivalents thereto.

100: Fuse 110: Outer tube
115: outer core 117: filler
120: Inner tube 130:
131: Base material 133: Plating part
140: fusible wire 150: first cap
150a: second cap 151:
153: engaging projection 154:
155: bottom 160: solder
170: lead wire 180: surface mounting cap
200: substrate 201: solder pad
210: hot plate

Claims (14)

An outer tube;
An inner tube inserted into the outer tube;
A fusible wire inserted into the inner tube;
A first cap provided at one end of the outer tube and electrically connected to the fusible wire;
And a second cap provided at the other end of the outer tube and electrically connected to the fusible wire,
An outer space is formed between the outer tube and the inner tube,
Wherein an inner space of the inner tube is an empty space, and the outer hollow portion is filled with a filler.
delete delete The method according to claim 1,
Wherein a joint is formed at both ends of the outer tube so as to increase a bonding force when soldering to the cap. The method according to claim 1,
Wherein a junction is formed at both ends of the inner tube to increase a bonding force when soldering the cap to the cap. The method according to claim 1,
Wherein a joint portion is formed at both ends of the inner tube and the outer tube to increase a coupling force when soldering the cap. 7. The method according to any one of claims 4 to 6,
Wherein the joint portion comprises a base material directly bonded to a surface of the outer tube or the inner tube, and a plating portion formed on a surface of the base material. The method according to claim 1,
Wherein a coupling portion is formed on a bottom surface of the cap so that the inner tube can be fitted into the coupling portion. 9. The method of claim 8,
Wherein the coupling portion is formed in an annular shape and has a plurality of coupling protrusions spaced apart from each other by a predetermined distance. 9. The method of claim 8,
Wherein the coupling portion comprises a plate-shaped support portion inserted and fixed on the bottom surface of the cap, and a plurality of coupling protrusions arranged annularly on the support portion. The method according to claim 1,
Wherein a side surface of the cap has a polygonal structure so as not to move during surface mounting. The method according to claim 1,
The first cap or the second cap may have a cylindrical shape,
And a surface mounting cap having a polygonal side surface is coupled to the first cap or the second cap so as to facilitate surface mounting. A step S1 of supplying solder to each of the first cap and the second cap and heating the solder to melt the solder;
Inserting the fusible wire into the inner tube;
Placing the inner tube and the outer tube on the first cap, and heating and soldering the first cap;
And mounting the second cap on the outer tube and heating and soldering the second cap.
A plurality of coupling protrusions arranged in an annular shape are formed on the bottom surface of the first cap,
The solder melted in the first cap moves through the space formed between the engaging projections and is uniformly distributed on the bottom surface of the first cap,
In step S3, the inner tube is seated in the engaging projection,
The step S3 may further include the step S3-1 of filling the outer hollow portion formed between the inner tube and the outer tube with the filler after the inner tube and the outer tube are seated on the first cap. A method of manufacturing a fuse of structure. delete

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