KR20190113230A - High voltage fuse and manufacturing method the same - Google Patents

Abstract

The present invention relates to a high-voltage fuse and a manufacturing method thereof. An element can be installed without a bonding process, and there is no fear of deformation during installation of the element. The high-voltage fuse of the present invention comprises: a hollow housing filled with an extinctive thread; a cap coupled to both ends of the housing and electrically connected to the outside; and an element assembly installed in the housing, connecting between the pair of caps, and having a fuse function for melting when an overcurrent is applied and an extinguishing function for preventing arc discharge. The manufacturing method of the high-voltage fuse of the present invention comprises: a step of forming an element and a contact ring on a base material of a thin film; a step of forming an element case by bending the base material on which the element and the contact ring are formed; a step of forming an element assembly by forming an extinctive block integrally with the element case; a step of assembling the caps at both ends of the element assembly; a step of coupling the housing to the assembly of the element assembly and the cap; and a step of providing the extinctive thread between the housing and the element assembly.

Description

High voltage fuse and manufacturing method thereof {HIGH VOLTAGE FUSE AND MANUFACTURING METHOD THE SAME}

The present invention relates to a high voltage fuse and a method for manufacturing the same. More particularly, the present invention relates to a high voltage fuse and a method for manufacturing the same, which are blown off when an overcurrent exceeding a set value is applied to an electric circuit of a vehicle to protect a component.

In general, the fuse is a safety device that is installed between the electrical supply source and the electrical component to prevent excessive current flow to the electrical component side. That is, when an overcurrent is applied, the element provided inside the fuse is momentarily blown to block the overcurrent to protect the circuit.

When the element is melted by the overcurrent, an arc discharge occurs at the melted portion. Arc discharge may cause the fuse housing to melt and cause a fire, and when delivered to the electric component side, the electric component may be burned out. In order to prevent this, the inside of the fuse housing is filled with a sand hose such as sand.

Conventional high voltage fuses include a housing filled with an extinguisher, a cap coupled to both ends of the housing, and an element installed inside the housing.

The element is electrically connected between a pair of caps, but is melted when overcurrent is applied to block the flow of current, and one or more elements are provided depending on the capacity of the fuse. These elements are manufactured in the form of straps with a thickness thinner than the width, and are joined to the cap by welding or the like.

However, the thin element has a problem in that the bonding with the cap is difficult, the time and cost of the bonding is deformed, and the deformation in the bonding process. In particular, when joining a plurality of elements to one cap it is not easy to determine the bonding position for maintaining the distance between the elements.

In addition, since charging the soho in the state in which the elements are bonded, it takes a lot of time to charge, there was a problem that soho is not completely injected to the inside of the cap. In addition, in order to assemble the housing in the cap joined through the element, a tool such as a C frame is absolutely necessary, which causes a very troublesome problem.

Republic of Korea Patent Publication No. 2017-0042852 (2017.04.20.)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a high-voltage fuse and a method of manufacturing the element, which can be installed without a bonding process and that there is no fear of deformation during installation of the element.

The high voltage fuse according to the present invention for achieving the above object is a hollow housing filled with a soho, a cap coupled to both ends of the housing and electrically connected to the outside, and installed in the housing and the pair It includes an element assembly that connects between the caps of and has a fuse function that melts when an overcurrent is applied and an arc protection function that prevents arc discharge.

The element assembly is composed of an element case which is melted when an overcurrent is applied, and an extinguishing block formed integrally with the element case. In this case, the arc-block is formed to surround at least a portion of the element case.

The element case includes a pair of contact rings inserted into the cap and an element connecting the pair of contact rings and disposed along the contact ring. At this time, the contact ring is exposed to the outside of the extinguishing block to contact the cap, and the element is located inside the extinguishing block.

The cap includes a body inserted into and coupled to an end of the housing, a leg protruding outwardly of the body, and a connection part protruding inwardly of the body. At this time, the connection portion is formed with a mounting groove into which the element assembly is inserted.

A fire extinguisher may be filled between the housing and the element assembly.

On the other hand, the manufacturing method of the high-voltage fuse, the step of forming the element and the contact ring on the base plate of the thin plate, the step of forming the element case by bending the base material formed with the element and the contact ring, and forming the extinguishing block integrally with the element case Fabricating the element assembly, assembling the caps at both ends of the element assembly, coupling the housing to the assembly of the element assembly and the cap, and filling the hose between the housing and the element assembly. do.

The present invention configured as described above, it is possible to manufacture in a simple manner by eliminating the bonding process when the element is installed, it is possible to reduce the manufacturing time and cost, it is possible to prevent the element is deformed during the bonding process.

In addition, since the present invention uses the extinguishing block formed integrally with the element case, the extinguisher can be injected to the inside of the cap, and assembling is very easy since a tool such as a C frame for assembling the housing is not required.

1 is a perspective view of a high voltage fuse according to an embodiment of the present invention.
2 is an exploded perspective view of a high voltage fuse according to one embodiment of the present invention;
3 is a cross-sectional view of a high voltage fuse according to an embodiment of the present invention.
4 is a partial cross-sectional perspective view of an element assembly of a high voltage fuse according to an embodiment of the present invention.
5 is a flowchart illustrating a manufacturing process of a high-voltage fuse according to an embodiment of the present invention.
6 is a process chart showing a manufacturing process of a high-voltage fuse according to an embodiment of the present invention.

With reference to the accompanying drawings will be described embodiments of the present invention; In the following description of embodiments according to the present invention, and in adding reference numerals to the components of each drawing, the same reference numerals are added to the same components as much as possible even though they are shown in different drawings.

The high voltage fuse 100 according to an embodiment of the present invention includes a hollow housing 110, caps 120 and 130 coupled to an end of the housing 110, and an element assembly installed inside the housing 110. 140,150). At this time, the element assemblies 140 and 150 are connected between the pair of caps 120 and 130, but have a fuse function and an arc extinguishing function to prevent arc discharge when the overcurrent is applied.

1 to 3, each component 110 to 150 of the high voltage fuse 100 according to the present embodiment will be described in more detail.

The housing 110 is a hollow pipe shape extending in one direction. Element assemblies 140 and 150 having a fuse function and an extinguishing function are installed inside the housing 110, and caps 120 and 130 sealing the hollow housing 110 and electrically connected to the outside are coupled to the end.

The housing 110 described above may be made of an insulating material such as glass, ceramic, synthetic resin, etc. so that the current applied to the element assemblies 140 and 150 does not leak to the outside. In particular, the housing 110 of the present embodiment is made of FRP (Fiber reinforced plastics) material is easy to assemble and transport, there is no fear of damage.

A through hole 112 is formed at an end of the housing 110, and a fixing bolt 114 for fixing caps 120 and 130 is installed at the through hole 112. The through hole 112 is composed of a plurality of radially disposed along the circumference of the housing (110).

An interior space of the housing 110, that is, a space except the element assemblies 140 and 150 is filled with the extinguisher 160. The high voltage fuse 100 of the present embodiment reliably blocks the arc discharge from being transmitted to the outside by adding the extinguisher 160 in addition to the element assemblies 140 and 150 having the extinguishing function.

Caps 120 and 130 are composed of a first cap 120 and a second cap 130 coupled to the ends of the housing 110, respectively. At this time, since the first cap 120 and the second cap 130 have the same shape and structure only in the injection hole 122 for filling the soho 160, the first cap 130 will be described below. ) Will be described with respect to the cap (120,130) as an example.

Cap 120 includes a body 121 that is inserted and coupled to the end of the housing 110. The body 121 is formed in a disk shape having a predetermined thickness to be inserted into the housing 110. In the body 121, an injection hole 122 for filling the extinguisher 160 is formed, and a lid 123 is assembled in the injection hole 122. In this case, an O-ring 124 for sealing may be installed on the outer circumferential surface of the body 122 in contact with the housing 110.

Legs 125 protrude from the outer front surface of the body 122. Leg 125 is a rectangular plate extending in the longitudinal direction of body 122. A fastening hole 126 for fastening with an external terminal is formed at the center of the leg 125.

The connecting portion 127 protrudes from the inner rear side of the body 122. The connecting portion 127 is a cube that protrudes in the longitudinal direction of the body 122. In the center of the connecting portion 127, a mounting groove 128 for installing the element assemblies 140 and 150 is formed.

The caps 120 and 130 described above are made of a conductive material to electrically connect both ends of the high voltage fuse 100 and to electrically connect the high voltage fuse 100 to the outside.

As described above, the caps 120 and 130 are fixed by the fixing bolts 114 assembled through the through-holes 112 in the state inserted into the end of the housing 110.

The element assemblies 140 and 150 are components having a fuse function that melts when an overcurrent is applied and an extinguishing function that prevents arc discharge. The element assemblies 140 and 150 are composed of an element case 140 having a fuse function and an extinguishing block 150 having an arc extinguishing function. At this time, the extinguishing block 150 is formed integrally with the element case 140 is formed as one component.

With reference to FIG. 4, the element assemblies 140 and 150 will be described in detail.

As described above, the element assemblies 140 and 150 are divided into the element case 140 and the arc block 150.

The element case 140 electrically connects the pair of caps 120 and 130 but melts when the overcurrent is applied to block the flow of current. The element case 140 includes a contact ring 142 inserted into the first cap 120 and the second cap 130, and an element 146 connecting the contact ring 142.

The contact ring 142 is manufactured in a rectangular ring shape so that the contact ring 142 may be inserted into and contacted with the mounting groove 128. On the surface of the contact ring 142, a plurality of protrusions 144 are formed to strengthen the contact with the mounting groove 128.

The element 146 is disposed along the pair of contact rings 142, and at the interruption thereof, a plurality of blow holes 148 are formed so that they can be easily melted when an overcurrent is applied. The element 146 of the present embodiment is composed of four elements arranged along the contact ring 142, but the number of elements 146 may be increased or decreased according to the capacity of the high voltage fuse 100.

The element case 140 described above has a hollow pipe shape extending in the longitudinal direction of the housing 110. The element case 140 having such a shape is manufactured by bending a metal base material of a thin plate. The element case 140 is formed by forming a contact ring 142 and an element 146 through a process such as pressing and then bending the metal base material.

The extinguishing block 150 blocks the arc discharge transmitted to the outside during the melting of the element case 140. To this end, the extinguishing block 150 is formed to surround the element 146 to be melted when the overcurrent is applied, the contact ring 142 in contact with the cap (120, 130) is formed to be exposed to the outside.

The SOHO block 150 is made of a mixture of SOHO and waterglass so as to be integrally formed with the element case 140. That is, after the element case 140 is inserted, the mixture of the Sohosa and the waterglass is injected and cured to complete the Sohoblock 150. At this time, the extinguishing block 150 is formed to surround the element 146, the contact ring 142 is formed to be exposed to the outside.

5 and 6, a method of manufacturing the high voltage fuse 100 having the above-described configuration will be described in detail.

First, the metal base material of the thin plate is prepared, and then the contact ring 142 and the element 146 are formed by processing such as pressing, and the element case 140 is bent by bending the metal base material on which the contact ring 142 and the element 146 are formed. ) Is molded (S10).

The element case 140 is bent in a pipe shape having a rectangular cross section, but is not necessarily limited thereto. In addition, the contact ring 142 and the element 146 of the element case 140 is provided with a protrusion 144 for strengthening contact with the mounting groove 128 and a blow hole 148 for melting when an overcurrent is applied. .

An element assembly 140 and 150 are manufactured by molding the arc-block 150 in the element case 140 (S20). That is, after the element case 140 is inserted into the mold, the mixture of the extinguisher and the water glass is injected and cured to complete the extinguishing block 150.

Here, the element 146 of the element case 140 is located inside the arc-block 150, while the contact ring 142 is exposed to the outside of the arc-block 150. The reason is that the element assemblies 140 and 150 electrically connect the pair of caps 120 and 130, but prevent the arc discharge generated when the overcurrent is applied to the outside.

When the element assemblies 140 and 150 are completed, the first cap 120 and the second cap 130 are assembled at both ends (S30). At this time, since a welding process such as welding is not necessary, the assembly may be simple, and time and cost may be saved, and deformation of the element assemblies 140 and 150 may be prevented.

The housing 110 is coupled to the assembly of the element assemblies 140 and 150 and the caps 120 and 130 (S40). That is, the caps 120 and 130 are coupled to seal the ends of the housing 110 and then fixed to the housing 110 using the fixing bolts 114.

Finally, the lid 123 is opened to open the injection hole 122, and after the injection of the extinguisher 160 through the injection hole 122, the lid 123 is closed and sealed (S50). The injected extinguisher 160 is evenly charged between the housing 110 and the element assembly 140.150 to reliably block the arc discharge from being transferred to the outside.

While the present invention has been described through the preferred embodiments, the above-described embodiments are merely illustrative of the technical idea of the present invention, and various changes may be made without departing from the technical idea of the present invention. Those of ordinary skill will understand. Therefore, the protection scope of the present invention should be interpreted not by the specific embodiments, but by the matters described in the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: high voltage fuse 110: housing
120: first cap 130: second cap
140,150: Element Assembly
140: element case
150: Soho Block 160: Soho

Claims (8)

A hollow housing filled with soho;
A cap coupled to both ends of the housing and electrically connected to the outside; And
And an element assembly installed inside the housing and connecting between the pair of caps, the element assembly having a fuse function that melts when an overcurrent is applied and an arc extinguishing function that prevents arc discharge.
The method according to claim 1,
The element assembly is composed of an element case which is melted when an overcurrent is applied, and a sub-block formed integrally with the element case,
The arc-extinguishing block is formed to surround at least a portion of the element case.
The method according to claim 2,
The element case includes a pair of contact rings inserted into the cap and an element connecting the pair of contact rings and disposed along the contact ring,
The contact ring is exposed to the outside of the extinguishing block in contact with the cap, and the element is located inside the extinguishing block.
The method according to claim 3,
The cap includes a body inserted into and coupled to an end of the housing, a leg protruding outward of the body, and a connection part protruding inward of the body,
The connection portion is a high voltage fuse, characterized in that the mounting groove is formed is inserted into the element assembly.
The method according to claim 4,
A high voltage fuse between said housing and said element assembly.
Forming an element and a contact ring in the base material of the thin plate;
Forming an element case by bending a base material having an element and a contact ring formed thereon;
Forming an element assembly by molding an arc extinguishing block integrally with the element case;
Assembling the caps at both ends of the element assembly;
Coupling the housing to the assembly of the element assembly and the cap; And
A method of making a high voltage fuse, comprising: charging a low extinguisher between a housing and an element assembly.
The method according to claim 6,
The SOHO block is a high voltage fuse manufacturing method, characterized in that for producing after mixing and curing the SOHO and water glass.
The method according to claim 7,
The contact ring is exposed to the outside of the extinguishing block to contact the cap, and the element is located inside the extinguishing block.

Images