KR20240015460A - High voltage fuse - Google Patents

Abstract

The present invention relates to a high-voltage fuse in which an element is always bonded at a constant position to improve bonding efficiency, comprising a housing, an element provided inside the housing and melted when an overcurrent is applied, and coupled to both ends of the housing. An inner cap having a through hole formed to expose the end of the element, a spacer for temporarily fixing the element by closely contacting the inner cap, an outer cap coupled to surround an end of the housing to which the inner cap is coupled, and the outer cap Includes terminals connected to. Here, the spacer is formed with a protrusion that is inserted into the through hole, and the protrusion temporarily fixes the element penetrating the inner cap in close contact with the through hole.

Description

High voltage fuse{HIGH VOLTAGE FUSE}

The present invention relates to a high-voltage fuse, and more specifically, to a high-voltage fuse that can improve the joining efficiency of elements.

In general, a fuse is a safety device installed between an electrical supply source and electrical components to prevent excessive current from flowing to the electrical components. That is, when overcurrent is applied, the element provided inside the fuse is momentarily blown to block the circuit, providing protection.

When an element is melted by overcurrent, an arc discharge occurs at the melted portion. Arc discharge can melt the housing and cause a fire, and if transmitted to electrical components, there is a risk of damaging them. To prevent such arc discharge, the inside of the housing is filled with extinguishing sand, such as sand.

A high-voltage fuse is disclosed in Unexamined Patent Publication No. 2022-0009200 (January 14, 2022).

The high-voltage fuse includes a hollow housing, a plurality of elements provided inside the housing, an inner cap coupled to both ends of the housing and to which the elements are bonded, and surrounding the inner cap to which the elements are bonded. It includes an outer cap coupled to an end of the housing, and a terminal coupled to the outer cap.

The high-voltage fuse described above has a structure in which the end of the element is bonded and fixed to the inner cap, but since the element passing through the inner cap is bonded in a fluid state, there is a problem in that the bonding position can easily change.

Additionally, if the elements are not joined at a certain position, the spacing between elements arranged in parallel varies for each product, so a high-voltage fuse of consistent quality cannot be expected and the designed performance cannot be achieved.

Publication of Patent No. 2022-0009200 (2022.01.14.)

The present invention is intended to solve the problems of the prior art described above, and its purpose is to provide a high-voltage fuse in which elements are always bonded at a constant position to improve bonding efficiency.

A high-voltage fuse according to the present invention for achieving the above object includes a housing, an element provided inside the housing and blown out when an overcurrent is applied, and a through hole formed to expose the ends of the element and coupled to both ends of the housing. It includes an inner cap, a spacer that temporarily fixes the element in close contact with the inner cap, an outer cap that is coupled to surround an end of the housing to which the inner cap is coupled, and a terminal that is joined to the outer cap.

Here, the spacer is formed with a protrusion that is inserted into the through hole, and the protrusion temporarily fixes the element penetrating the inner cap in close contact with the through hole.

According to the present invention described above, the element penetrating the inner cap is bonded while being temporarily fixed by a spacer, so the element can always be touched at a constant position and bonding efficiency can be improved.

In addition, since the spacing between elements placed in parallel can be kept constant, high voltage fuses of the same quality can be produced and high voltage fuses that can deliver the designed performance are possible.

1 is a perspective view of a high-voltage fuse according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of a high-voltage fuse according to an embodiment of the present invention.
Figure 3 is an enlarged view of some of the high-voltage fuses according to an embodiment of the present invention.
Figure 4 is a cross-sectional view of a high-voltage fuse according to an embodiment of the present invention.

The above-mentioned objects, features, and advantages will be described in detail later with reference to the attached drawings, so that those skilled in the art will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, identical reference numerals are used to indicate identical or similar components.

Although first, second, etc. are used to describe various components, these components are of course not limited by these terms. These terms are only used to distinguish one component from another component, and unless specifically stated to the contrary, the first component may also be the second component.

Throughout the specification, unless otherwise stated, each element may be singular or plural.

Hereinafter, the “top (or bottom)” of a component or the arrangement of any component on the “top (or bottom)” of a component means that any component is placed in contact with the top (or bottom) of the component. Additionally, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Additionally, when a component is described as being “connected,” “coupled,” or “connected” to another component, the components may be directly connected or connected to each other, but the other component is “interposed” between each component. It should be understood that “or, each component may be “connected,” “combined,” or “connected” through other components.

As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, terms such as “consists of” or “comprises” should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or steps may include It may not be included, or it should be interpreted as including additional components or steps.

Additionally, as used herein, singular expressions include plural expressions, unless the context clearly dictates otherwise. In the present application, terms such as “consists of” or “comprises” should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or steps may include It may not be included, or it should be interpreted as including additional components or steps.

Throughout the specification, when referred to as “A and/or B”, this means A, B or A and B, unless specifically stated to the contrary, and when referred to as “C to D”, this means unless specifically stated to the contrary. Unless there is one, it means that it is C or higher and D or lower.

As shown in the drawing, the high-voltage fuse 10 according to an embodiment of the present invention includes a housing 110, an element 120 provided inside the housing 110, and both ends of the housing 110. an inner cap 130 coupled to an outer cap 140 surrounding the end of the housing 110 to which the inner cap 130 is coupled, a spacer 150 interposed between the inner cap 130 and the outer cap, and , and is configured to include a terminal 160 joined to the outer cap 140.

The housing 110 is a body that forms the external shape of the high voltage fuse 10.

The housing 110 has a cylindrical shape that extends in one direction and has both ends open. The interior of the housing 110 is hollow, and an element 120 is provided inside the hollow. At this time, the interior of the housing 110, that is, the portion excluding the element 120, is filled with the extinguishing yarn 170 (see FIG. 4).

The housing 110 may be made of an insulating material so that the current applied to the element 120 does not leak to the outside. For example, it can be made of synthetic resin, glass, ceramic, etc., and a housing made of ceramic material is used for large-capacity high-voltage fuses with a diameter of 38 mm or more.

The element 120 is a fuse element that blows when overcurrent is applied and blocks the current.

The element 120 has a strap shape that is longer in length compared to the width and thinner in thickness. Although not shown in the drawing, a number of fusing holes (not shown) are formed in the strap-shaped element 120. These fusing holes (not shown) vary depending on the capacity (rated capacity, blocking capacity) of the high-voltage fuse 10. It may have a shape and arrangement structure.

The element 120 is preferably made of a conductive material such as copper so that it can be electrically connected to the inner cap 130 coupled to both ends of the housing 110.

Meanwhile, the elements 120 of this embodiment consist of two pairs, that is, a total of four, arranged opposite each other, and are arranged in parallel to be spaced apart at regular intervals along the inner circumference of the housing 110. And the end of the element 120 penetrates the inner cap 130 and is then bent at a right angle to be joined to the outer surface of the inner cap 130.

The inner cap 130 and the outer cap 140 are closing caps that seal the open end of the housing 110.

The inner cap 130 consists of a pair respectively coupled to both ends of the housing 110, and is formed in a cup shape with one end closed to surround the ends of the housing 110. And a through hole 132 for assembly of the element 120 is formed at the sealed end of the inner cap 130.

The through hole 132 is formed in a square shape so that the four elements 120 are spaced apart at regular intervals along the inner circumference of the housing 110. At this time, the length of one side of the through hole 132 is longer than the width of the element 120.

The inner cap 130 described above is formed to have a diameter equal to or smaller than that of the housing 110 so that it can be securely coupled to the end of the housing 110. At this time, the inner cap 130 is coupled to the end of the housing 110 by hot pressing or forced pressing.

The hot pressing method is a method of instantly heating the inner cap 130 to a predetermined temperature to expand its diameter and then pressing the end of the housing 110. If the inner cap 130 is coupled using the hot press fitting method in this way, the inner cap 130 can be coupled without the use of fastening means such as bolts.

The outer cap 140 consists of a pair respectively coupled to both ends of the housing 110. The outer cap 140 is formed in a cup shape with one end sealed so as to surround the end of the housing 110 to which the inner cap 130 is coupled. At this time, if an adhesive such as epoxy is applied to the inner peripheral surface of the outer cap 140, the outer cap 140 can be more firmly coupled.

The spacer 150 is a means for temporarily fixing the element 120 that has penetrated the inner cap 130.

The spacer 150 has a multi-stage disk shape with a smaller diameter than the inner cap 130. That is, the spacer 160 has a multi-stage disk shape with a protrusion 152 formed in the center of one side.

The protrusion 152 is inserted into the through hole 132 of the inner cap 130 when the spacer 150 is installed. The protrusion 152 inserted into the through hole 132 temporarily fixes the element 120 in close contact with the through hole 132.

In the case of this embodiment, the protrusion 152 is formed in a circular shape, which minimizes the contact area with the elements 120 arranged radially along the inner circumference of the housing 110 and allows the element 120 to come into close contact with the through hole 132. This is to pressurize it so that it can be done.

The terminal 170 serves to physically and electrically connect the high voltage fuse 100 to the outside. This terminal 150 is manufactured by bending a thin plate of a predetermined thickness, and is joined to one surface of the outer cap 140 through welding or the like.

In the high-voltage fuse 10 of the above-described configuration, the element 120 penetrating the inner cap 130 is temporarily fixed by the protrusion 152 of the spacer 150, and then is connected to the inner cap 130 together with the spacer 150. Since it is bonded to, the element 120 can always be touched at a constant location and bonding efficiency can be improved.

In addition, since the spacing between the elements 120 radially arranged along the inner circumference of the housing 110 can be kept constant, it is possible to produce a high-voltage fuse 10 of the same quality and a high-voltage fuse 10 capable of performing as designed. ) production becomes possible.

In addition, since the protrusion 152 of the spacer 150 presses the extinguished sand 170 filled inside the housing 110, the occurrence of voids can be minimized and the filling rate can be improved.

As described above, the present invention has been described with reference to the illustrative drawings, but the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that transformation can occur. In addition, although the operational effects according to the configuration of the present invention were not explicitly described and explained while explaining the embodiments of the present invention above, it is natural that the predictable effects due to the configuration should also be recognized.

10: high voltage fuse 110: housing
120: Element 130: Inner cap
140: Outer cap 150: Spacer
160: terminal 170: Sohosa

Claims (5)

housing;
an element provided inside the housing and melted when an overcurrent is applied;
an inner cap coupled to both ends of the housing and having a through hole formed to expose the end of the element;
A spacer for temporarily fixing the element in close contact with the inner cap;
an outer cap coupled to surround an end of the housing to which the inner cap is coupled; and
A high-voltage fuse including a terminal bonded to the outer cap.
In claim 1,
The spacer is formed with a protrusion inserted into the through hole,
A high-voltage fuse, wherein the protrusion temporarily fixes the element penetrating the inner cap by bringing it into close contact with the through hole.
In claim 2,
The high voltage fuse is characterized in that the through hole is formed in a square shape, and the protrusion is formed in a circular shape that can be inserted into the through hole.
In claim 3,
A high voltage fuse, characterized in that the element consists of at least one pair arranged opposite to each other.
In claim 4,
A high voltage fuse, characterized in that the spacer is bonded to the inner cap together with the element.

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