KR102481031B1 - Current short-circuit fuse for high voltage with thermally deformable material - Google Patents

Abstract

Disclosed is a short-circuit fuse for a high-voltage current with a thermal deformation material, which can increase an operation speed by inducing a thermal deformation material to flow downward through a hole formed in a thermal deformation seating module when an overcurrent is generated. According to an embodiment of the present invention, the short-circuit fuse for a high-voltage current with a thermal deformation material, which short-circuits a current when a high temperature is generated by a high-pressure current in which the high-voltage short-circuit fuse, comprises: a cup-shaped lower cap (10) to which a first lead wire (L1) for transferring external power is connected; a round rod-shaped ceramic rod part (20) inserted into the lower cap (10); an induction coil (C) connected to an outer circumferential surface of the ceramic rod part (20) and wound in an upper direction; a thermal deformation seating module (30) coupled to an upper portion of the ceramic rod part (20); a thermal deformation material (T) protruding from an upper central portion of the thermal deformation seating module (30) and including a cylindrical thermal deformable separation part melted by heat generated by the current; a pipe-shaped ceramic insulating part (40) seated on an upper side of the thermal-deformable seating module (30) to press the thermal deformation seating module (30) in a lower direction; a molten solution accommodating part (S) provided inside the ceramic insulating part (40) and accommodating a molten solution of the molten thermal deformation material (T); and a cup-shaped upper cap (50) which is seated on an upper portion of the ceramic insulating part (40) and to which a second lead wire (L2) for transferring the current to an outside is connected, wherein the thermal deformation seating module (30) fixes the ceramic rod part (20) and the ceramic insulating part (40), and a disc-shaped seating plate (31) in which at least one hole is formed is provided inside therein.

Description

Current short-circuit fuse for high voltage with thermal deformation material {CURRENT SHORT-CIRCUIT FUSE FOR HIGH VOLTAGE WITH THERMALLY DEFORMABLE MATERIAL}

The present invention relates to a high-voltage current short-circuit fuse, and more particularly, to a high-voltage current short-circuit fuse equipped with a thermal strain breakaway portion so that the flow of current is safely short-circuited when a high voltage is generated.

Recently, as electronic devices are gradually being miniaturized and integrated, the risk of fire or explosion of devices due to overcurrent or overheating due to various causes such as short circuit due to deterioration of parts within the device is increasing day by day, and lightning strikes due to climate change Due to the frequent occurrence of surges and their inflow into electronic devices through power lines, surge protection measures are becoming increasingly necessary, and the development of safety parts that can protect against overheating, overcurrent, and surges in a complex manner is required.

As such safety parts, current short-circuit fuses have been developed that short-circuit the flow of current when an abnormal overcurrent or high temperature occurs in the circuit of an electronic product.

In general, current short-circuit fuses are composed of an element that is short-circuited by overcurrent inside to prevent device failures caused by inrush current, internal temperature rise, and continuous overcurrent that occur when power is turned on in electrical circuits of home appliances. It is installed at the power input terminal of the circuit to protect the power circuit.

As a technical literature on conventional fuses, Korean Patent Registration No. 10-1179546 discloses a repetitive fuse that uses an elastic member to protect overheating and prevent overcurrent from flowing in a circuit, and Korean Patent Registration No. 10-1179546 No. 1514956 discloses a composite fuse that blocks overheating and overcurrent by using a solder ball and an elastic body to block electrical connection.

However, conventional current short-circuit fuses have many internal components, whereas they are used in small electronic products, and the production cost is unnecessarily increased, and the manufacturing process is complicated, so the defect rate increases during manufacturing.

Therefore, although a current short-circuit fuse containing a heat-transformable material has been disclosed in order to improve these problems, the effect of the current-short circuit fuse including a heat-transformable material, such as uniform heat transfer to the heat-transformable material and an improvement in operating speed, has been disclosed. More research is needed to maximize this.

The present invention includes a thermal deformation seating module having at least one hole therein, so that when an overcurrent occurs, the thermal deformation material is induced to flow downward through the hole provided in the thermal deformation seating module, thereby improving the operation speed. Its purpose is to provide a current short-circuit fuse for high voltage equipped with a thermal deformation material.

Another object of the present invention is to provide a high-voltage current short-circuit fuse equipped with a thermal deformation material capable of improving thermal conductivity to the thermal deformation material by setting different thicknesses of the upper region and the lower region of the thermal deformation seating module.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems to be solved by the present invention that are not mentioned here are to those of ordinary skill in the art to which the present invention belongs from the description below. will be clearly understood.

According to an embodiment of the present invention, a high-voltage current short-circuit fuse equipped with a thermally deformable material is a current short-circuit fuse that short-circuits the current when a high temperature is generated by a high-voltage current, to which a first lead wire for transmitting external power is connected. A cup-shaped lower cap, a circular bar-shaped ceramic rod inserted into the lower cap, an induction coil connected to the outer circumferential surface of the ceramic rod 20 and wound upward, coupled to the upper portion of the ceramic rod 20 A thermal deformation seating module, a thermal deformation material consisting of a cylindrical thermal deformation release part that protrudes from the upper center of the thermal deformation seating module and is melted by the heat generated by an electric current, is seated on the upper side of the thermal deformation seating module and supports the thermal deformation seating module at the lower part. A pipe-shaped ceramic insulating part that presses in the direction, a melt receiving part provided inside the ceramic insulating part and containing a melt of a molten thermal deformation material, and a second lead wire seated on top of the ceramic insulating part and transmitting current to the outside It includes a connected cup-shaped upper cap 50, and the thermal deformation seating module fixes the ceramic rod part and the ceramic insulator, and is provided in a pipe shape and has a disk-shaped seating plate with at least one hole formed therein. to be

In addition, the thermal deformation seat module is characterized in that a first center hole is provided at the center of the seat plate, and the size of the first center hole is provided in a tapered shape that becomes narrower in the direction in which the induction coil is wound.

In addition, the thermal deformation seating module is divided into an upper area located on the upper side and a lower area located on the lower side with respect to the seating plate, and the thickness of the thermal deformation seating module forming the upper area is the thermal deformation seating module forming the lower area. It is characterized in that it is 1 to 2 times the thickness of the module.

In addition, the thermal strain seating module has a rod insertion portion inclined at a predetermined angle to easily insert the ceramic rod portion on the inner surface of the lower region, and an insulation inclined at a predetermined angle to easily insert the ceramic insulator on the inner surface of the upper region. An insertion part is formed, at least one first fastening protrusion is provided on one side of the inner portion of the lower cap, at least one first fastening groove is provided on one side of the lower cap, and at least one first fastening groove fitted with the first fastening protrusion is provided on one side of the ceramic rod portion. At least one second fastening protrusion is provided on one side of the inner portion, and at least one second fastening groove fitted with the second fastening protrusion is provided on one side of the upper portion of the ceramic insulator.

In addition, in the thermal deformation seating module, a heat conductive sheet is attached to the lower surface of the seating plate, and the thickness of the heat conductive sheet is determined corresponding to an air gap, which is a space generated between the seating plate and the ceramic rod part, and the air gap conducts heat. When the thickness is smaller than the predetermined minimum thickness of the sheet, a thermally conductive paste is applied to the air gap.

According to the present invention, the high-voltage current short-circuit fuse equipped with a thermal deformation material includes a thermal deformation seating module having at least one hole therein, so that when an overcurrent occurs, the thermal deformation material passes through the hole provided in the thermal deformation seating module in a downward direction. It has the effect of improving the operating speed by inducing it to flow down.

In addition, by setting different thicknesses of the upper region and the lower region of the thermal deformation seating module, the thermal conductivity of the thermal deformation material can be improved.

1 is a cross-sectional view of a high-voltage current short-circuit fuse equipped with a thermal deformation material according to an embodiment of the present invention.
2 is a view for explaining a thermal deformation seating module of a high voltage current short-circuit fuse equipped with a thermal deformation material according to an embodiment of the present invention.
3 is a view for explaining the thickness characteristics of a thermal deformation seating module of a high voltage current short-circuit fuse equipped with a thermal deformation material according to an embodiment of the present invention.
4 and 5 are views for explaining a rod insertion part and an insulation insertion part of a thermal deformation seating module of a high voltage current short-circuit fuse equipped with a thermal deformation material according to an embodiment of the present invention.
6 is a view for explaining a lower cap and a ceramic rod portion of a high voltage current short-circuit fuse equipped with a thermal deformation material according to an embodiment of the present invention.
7 is a view for explaining an upper cap and a ceramic insulator of a high-voltage current short-circuit fuse equipped with a thermal deformation material according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the presented examples, and those skilled in the art who understand the spirit of the present invention may add, change, delete, etc. other elements within the scope of the same spirit, through other degenerative inventions or the present invention. Other embodiments included within the scope of the inventive idea can be readily suggested, but it will also be said to be included within the scope of the inventive concept.

In addition, components having the same function within the scope of the same idea appearing in the drawings of each embodiment are described using the same reference numerals.

1 is a cross-sectional view of a high-voltage current short-circuit fuse equipped with a heat-transformable material according to an embodiment of the present invention, and FIG. 3 is a view for explaining the thickness characteristics of the thermal deformation seating module of the high voltage current short-circuit fuse equipped with a thermal deformation material according to an embodiment of the present invention, and FIG. 5 is a view for explaining a rod insertion part and an insulation insertion part of a thermal deformation seating module of a high voltage current short-circuit fuse equipped with a thermal deformation material according to an embodiment of the present invention, and FIG. 6 is an embodiment of the present invention. 7 is a view for explaining a lower cap and a ceramic rod portion of a high-voltage current short-circuit fuse equipped with a heat-transformable material according to the present invention, and FIG. It is a drawing for explaining the cap and the ceramic insulator.

<Example 1>

Referring to FIGS. 1 and 2, the high-voltage current short-circuit fuse equipped with a thermally deformable material according to an embodiment of the present invention is a current short-circuit fuse that short-circuits the current when a high temperature is generated by a high-voltage current. Cap 10, ceramic rod part 20, induction coil (C), thermal deformation seating module 30, thermal deformation material (T), ceramic insulator 40, melt container (S) and upper cap ( 50) may be included.

Here, the lower cap 10 is connected to the first lead wire L1 for transmitting external power, and may be provided in a cup shape. In addition to the cup shape, the shape of the lower cap 10 may be a cap shape with a concave inside, and various shapes such as a hemispherical shape, a cylindrical column with one side opened, a square column with one side opened, and a polygonal column with one side opened can be used. can

The ceramic rod part 20 is inserted into the lower cap 10 and may be provided in a round bar shape. For example, the ceramic rod part 20 may be formed of a non-conductive material so as to block electricity, but may be formed of a material having high temperature conductivity.

The induction coil (C) is connected to the outer circumferential surface of the ceramic rod part 20 and may be wound upward. In this case, the thickness, winding interval, and number of windings of the induction coil C may be determined based on the voltage and current applied through the first lead wire L1.

The thermal deformation seating module 30 may be coupled to an upper portion of the ceramic rod part 20 . At this time, the thermal deformation seating module 30 fixes the ceramic rod part 20 and the ceramic insulating part 40, and is provided in a pipe shape and has a disk-shaped seating plate 31 having at least one hole formed therein. ) can be provided.

The thermal deformation material T may include a cylindrical thermal deformation release portion that protrudes from the upper center of the thermal deformation seating module 30 and is melted by heat generated by an electric current. More specifically, the current introduced through the first lead wire (L1) is energized to the lower cap (10) and moves upward through the induction coil (C) connected to the upper end of the lower cap (10). After that, it can be transferred to the thermal deformation material (T) through the thermal deformation seating module 30 connected to the upper end of the induction coil (C).

At this time, when an overload current is transferred to the induction coil (C), high-temperature heat is generated, and the thermally deformable portion of the thermally deformable material (T) may be melted by the heat transferred to the thermally deformable material (T). there is.

When the predetermined temperature of the thermally deformable material (T) is not satisfied, the moved current passes through the thermally deformable material (T) and moves to the outside through the upper cap (50).

However, when heat is generated in the thermally deformable material (T) above a predetermined temperature, that is, when high-voltage power is generated and heat is generated inside, the thermally deformable portion formed in the thermally deformable material 30 is melted and the upper part is melted. is melted down and dropped to the lower part, so that the current flowing by leaving the thermal strain release part in contact with the upper cap 50 can be short-circuited.

Thus, by shorting the flow of current introduced through the lower cap 10, it is possible to safely protect the circuit in case of overload and overvoltage of the electronic product.

The ceramic insulator 40 may be provided in a pipe shape that is seated on the upper side of the thermal deformation seating module 30 and presses the thermal deformation seating module 30 downward. Like the ceramic rod part 20, the ceramic insulating part 40 may be formed of a non-conductor so that the ceramic rod part 20 is not energized.

The melt accommodating portion S is provided inside the ceramic insulating portion 40 and may contain the melt of the molten thermally deformable material T. At this time, it is preferable that the inner diameter of the ceramic insulating part 40 is formed to a diameter larger than the outer diameter of the thermally deformable part of the thermally deformable material T, and the melt containing part S is formed through the space between the ceramic insulating parts 40. Do. Therefore, it is possible to prevent the melt from permeating in an unnecessary direction in the thermally deformable portion of the thermally deformable material T in advance.

The upper cap 50 is seated on top of the ceramic insulator 40 and is connected to a second lead wire L2 that transfers current to the outside, and may be provided in a cup shape. In addition, similar to the lower cap 10, the shape of the upper cap 50 may be a cap shape with a concave inside in addition to a cup shape, and a hemispherical shape, a cylindrical column with one side opened, a square column with one side opened, and a cap shape with one side opened. Various shapes such as this open polygonal column can be used.

More specifically, referring to FIG. 3 , in the thermal deformation seating module 30, the first central hole 32 is provided in the central portion of the seating plate 31, and the first central hole 32 The size of may be provided in a tapered shape that becomes narrower in the direction in which the induction coil (C) is wound.

At this time, since the molten thermal deformation material T has a property of moving into an empty space, the molten thermal deformation material T is formed in the first central hole 32 of the thermal deformation seating module 30. It moves rapidly in the downward direction, and the current short-circuit operation speed by the thermal deformation material (T) can be improved.

For example, a spiral groove may be formed along an inclined surface of the first central hole 32, and when the spiral groove is formed, an area in contact with the thermally deformable material T is increased, and the thermal deformation material T is contacted with the heat. The speed at which the transforming material T moves in the downward direction of the first central hole 32 may be increased.

Meanwhile, the first central hole 32 narrows at an angle of 30 to 60 degrees in the direction in which the induction coil C is wound. It is desirable to narrow while forming an angle of 45 degrees in the direction.

In addition, the thermal deformation seating module 30 is divided into an upper area located on the upper side and a lower area located on the lower side with respect to the seating plate 31, and the thermal deformation seating module forming the upper area ( The thickness D1 of 30) may be 1 to 2 times the thickness D2 of the thermal deformation seating module 30 forming the lower region.

That is, when the thickness D2 of the lower region is smaller than the thickness D1 of the upper region, the heat generated in the ceramic rod part 20 can be more easily transferred to the thermally deformable material furnace T.

At this time, the thickness of the seat plate 31 may be provided to be the same as the thickness D2 of the lower region. Therefore, heat generated from the ceramic rod part 10 can be uniformly transferred to the thermally deformable material T.

Meanwhile, the minimum thickness of the thermal deformation seating module 30 is 0.2 mm and the maximum thickness is 0.35 mm, and the thermal deformation seating module 30 is preferably provided with a thickness of 0.25 mm.

Meanwhile, referring to FIG. 4 , the thermal strain seating module 30 has a rod insertion portion 33 inclined at a preset angle so that the ceramic rod portion 20 can be easily inserted into the inner surface of the lower region. , Insulation inserts 34 inclined at a preset angle may be formed on the inner surface of the upper region so that the ceramic insulator 40 is easily inserted.

At this time, the rod inserting portion 33 and the insulating inserting portion 34 are formed with an inclination of 45 to 75 degrees to guide the ceramic rod portion 20 and the ceramic insulating portion 40 to be easily inserted. It may be formed at an angle of 60 degrees.

As another example, as shown in FIG. 5 , the rod insertion part and the insulation insertion part 34 are provided in a curved shape rather than a flat shape, and the ceramic rod part 20 and the ceramic insulating part 40 can be induced to be inserted more easily.

6 and 7, the lower cap 10 is provided with at least one first fastening protrusion 11 on one side of the inner surface, and the ceramic rod part 20 has the first fastening on one side of the lower cap. At least one first fastening groove 21 fitted with the protrusion 11 may be provided.

In addition, at least one second fastening protrusion 51 is provided on one side of the upper cap 50, and the ceramic insulator 40 is fitted with the second fastening protrusion 51 on one side of the upper cap. At least one second fastening groove 41 may be provided.

Therefore, the ceramic rod part ( 20) and the movement of the ceramic insulator 40 can be minimized.

Meanwhile, in the thermal strain seating module 30 , a thermal conductive sheet may be attached to a lower surface of the seating plate 31 . The thickness of the heat conduction sheet is determined corresponding to an air gap, which is a space generated between the seating plate 31 and the ceramic rod part 20, and when the air gap is smaller than a predetermined minimum thickness of the heat conduction sheet, A thermally conductive paste may be applied to the air gap.

More specifically, the minimum thickness of the heat conductive sheet may be provided as 0.05 mm, and when the air cap generated between the seating plate 31 and the ceramic rod part 20 is less than 0.05 mm, the heat conductive sheet A non-thermal conductive paste may be applied to the lower surface of the seating plate 31 and the upper surface of the ceramic rod part 20 .

Therefore, it is possible to minimize the air gap generated between the thermal deformation seating module 30 and the ceramic rod part 20 and improve thermal conduction efficiency, and as the thermal conduction efficiency is improved, the operating speed of the current short-circuit fuse is improved. can make it

For example, an impact-resistant coating portion (not shown) may be formed on the outer surface of the lower cap 10 or the upper cap 50 to which a coating film is applied so that external current penetrates or impact is blocked.

Here, the anti-impact coating part (not shown) is outside the lower cap 10, the induction coil C, the ceramic rod part 20, the ceramic insulator 40 and the upper cap 50. It is preferably applied to the surface.

According to the effects of the present invention as described above, by including a thermal deformation seating module having at least one hole therein, the thermal deformation material is induced to flow downward through the hole provided in the thermal deformation seating module when an overcurrent occurs. A current short-circuit fuse for high voltage equipped with a thermal deformation material capable of improving speed may be provided.

In addition, a high-voltage current short-circuit fuse equipped with a thermal deformation material capable of improving thermal conductivity to the thermal deformation material may be provided by setting different thicknesses of the upper region and the lower region of the thermal deformation seating module.

In the above, the configuration and characteristics of the present invention have been described based on the embodiments according to the present invention, but the present invention is not limited thereto, and various changes or modifications can be made within the spirit and scope of the present invention. It is apparent to those skilled in the art, and therefore such changes or modifications are intended to fall within the scope of the appended claims.

10: lower cap 11: first fastening protrusion
20: ceramic rod part 21: first fastening groove
30: thermal deformation seating module 31: seating plate
32: first central hall
33: rod insertion part
34: insulation insertion part
40: ceramic insulator
50: upper cap
L1: 1st lead wire
L2: 2nd lead wire
C: induction coil
T: thermal deformation material
S: melt receiving part

Claims (5)

In a current short-circuit fuse that short-circuits the current when a high temperature is generated by a high-voltage current,
a cup-shaped lower cap 10 to which a first lead wire L1 for transmitting external power is connected;
a round bar-shaped ceramic rod part 20 inserted into the lower cap 10;
an induction coil (C) connected to the outer circumferential surface of the ceramic rod part (20) and wound in an upward direction;
a thermal deformation seating module 30 coupled to an upper portion of the ceramic rod part 20;
a thermal deformation material (T) formed of a cylindrical thermal deformation release portion protruding from the upper center of the thermal deformation seating module 30 and melting by heat generated by an electric current;
a pipe-shaped ceramic insulator 40 seated on an upper side of the thermal deformation seating module 30 and pressing the thermal deformation seating module 30 downward;
a melt accommodating part (S) provided inside the ceramic insulating part (40) and accommodating the melt of the molten thermally deformable material (T);
A cup-shaped upper cap 50 seated on top of the ceramic insulator 40 and connected to a second lead wire L2 that transfers current to the outside; includes,

The thermal deformation seating module 30,
Fixing the ceramic rod part 20 and the ceramic insulator part 40,
A disk-shaped seating plate 31 provided in a pipe shape and having at least one hole formed therein is provided, and a first central hole 32 is provided at the center of the seating plate 31,
The size of the first central hole 32 is provided in a tapered shape that becomes narrower in the direction in which the induction coil is wound. delete According to claim 1,
The thermal deformation seating module 30,
It is divided into an upper region located on the upper side and a lower region located on the lower side with respect to the seating plate 31,
Thermal deformation, characterized in that the thickness (D1) of the thermal deformation seating module 30 forming the upper region is 1 to 2 times the thickness (D2) of the thermal deformation seating module 30 forming the lower region Current short-circuit fuse for high voltage with material. According to claim 3,
The thermal deformation seating module 30 is
A rod insertion part 33 inclined at a predetermined angle is formed on the inner surface of the lower region to easily insert the ceramic rod part 20, and the ceramic insulating part 40 is easily inserted into the inner surface of the upper region. An insulating insertion portion 34 inclined at a predetermined angle to be inserted is formed,

The lower cap 10 is provided with at least one first fastening protrusion 11 on one side of the inside,
At least one first fastening groove 21 fitted with the first fastening protrusion 11 is provided on one side of the lower portion of the ceramic rod part 20,

The upper cap 50 is provided with at least one second fastening protrusion 51 on one side of the inside,
The ceramic insulating part 40 is provided with at least one second fastening groove 41 fitted with the second fastening protrusion 51 on one side of the upper portion, characterized in that the high voltage current equipped with a thermal deformation material. Short fuse. In a current short-circuit fuse that short-circuits the current when a high temperature is generated by a high-voltage current,
a cup-shaped lower cap 10 to which a first lead wire L1 for transmitting external power is connected;
a round bar-shaped ceramic rod part 20 inserted into the lower cap 10;
an induction coil (C) connected to an outer circumferential surface of the ceramic rod part (20) and wound in an upward direction;
a thermal deformation seating module 30 coupled to an upper portion of the ceramic rod part 20;
a thermal deformation material (T) formed of a cylindrical thermal deformation release portion protruding from the upper center of the thermal deformation seating module 30 and melting by heat generated by an electric current;
a pipe-shaped ceramic insulator 40 seated on an upper side of the thermal deformation seating module 30 and pressing the thermal deformation seating module 30 downward;
a melt accommodating part (S) provided inside the ceramic insulating part (40) and accommodating the melt of the molten thermally deformable material (T);
A cup-shaped upper cap 50 seated on top of the ceramic insulator 40 and connected to a second lead wire L2 that transfers current to the outside; includes,

The thermal deformation seating module 30,
Fixing the ceramic rod part 20 and the ceramic insulator part 40,
It is provided in a pipe shape, and a disk-shaped seating plate 31 having at least one hole formed therein is provided,
A thermal conductive sheet is attached to the lower surface of the seating plate 31,
The thickness of the thermal conductive sheet is determined corresponding to an air gap, which is a space generated between the seating plate 31 and the ceramic rod part 20,
When the air gap is smaller than the predetermined minimum thickness of the thermal conductive sheet, the high voltage current short-circuit fuse having a thermal deformation material, characterized in that the thermal conductive paste is applied to the air gap.

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