KR101434802B1 - Surge absorber and manufacturing method thereor - Google Patents

Abstract

More particularly, the present invention relates to a surge absorber and a method of manufacturing the surge absorber, and more particularly to a surge absorber and a method of manufacturing the surge absorber. And more particularly, to a surge absorber capable of stably sealing a ceramic tube tube at a high voltage and a method of manufacturing the same.

Description

Technical Field [0001] The present invention relates to a surge absorber,

More particularly, the present invention relates to a surge absorber and a method of manufacturing the surge absorber, and more particularly to a surge absorber and a method of manufacturing the surge absorber. And more particularly, to a surge absorber capable of stably sealing a ceramic tube tube at a high voltage and a method of manufacturing the same.

Generally, a surge absorber is provided in a portion susceptible to an electric shock due to an abnormal voltage such as a lightning surge or static electricity, and consumes discharge energy by gas discharge when an abnormal voltage is input, Is prevented from being damaged. Such a surge absorber is mainly installed in a connection portion with a communication line of a communication electronic apparatus such as a telephone, a facsimile, and a modem, or a drive circuit of a display such as a television and a monitor.

10 is a sectional view showing the structure of a conventional surge absorber. Referring to FIG. 10, the surge absorber disclosed in Korean Patent Laid-Open No. 10-2012-0097135 comprises a receiving tube 11 filled with an inert gas, A pair of sealing electrodes 12 provided at both ends of the receiving tube 11 and electrically connected to the respective lead wires 13 and a surge absorbing element 15 electrically connected to the sealing electrodes 12, Wherein the surge absorption element 15 includes a nonconductive member 16, a conductive coating 17 provided to surround the nonconductive member 16, and a conductive coating 17 covering the conductive coating 17 And a plurality of discharge gaps 19 for dividing the conductive film 17 and the protective film 18.

However, in the conventional surge absorber, since the receiving tube is made of glass, and the sealing electrode is inserted into the receiving tube and the glass is melted at a high temperature, the bonding strength can not be sufficiently secured. In addition, the conventional surge absorber has a problem that the strength and bonding strength of the receiving tube of glass material is weak and the durability thereof is poor, and thus there is a problem that the stability is low when used at a high voltage.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a ceramic tube tube made of a ceramic material excellent in mechanical strength and a ceramic tube tube and a sealing electrode bonded to each other by a brazing ring, Which is capable of sealing the ceramic tube tube thoroughly, and a method of manufacturing the same.

It is also an object of the present invention to provide a surge absorber which can be used stably even at a high voltage with improved sealing performance and durability, and a method of manufacturing the surge absorber.

Another object of the present invention is to provide a surge absorber and a method of manufacturing the surge absorber capable of improving the wettability, bonding strength and discharge performance of the brazing ring by forming a plating layer in a region where brazing is performed.

To this end, the surge absorber according to the present invention comprises: a ceramic tube tube filled with an inert gas; A pair of sealing electrodes provided at both ends of the ceramic tube and electrically connected to the respective lead wires; A surge absorption element accommodated in the ceramic tube and electrically connected to the sealing electrodes and having a discharge gap; And a brazing ring for sealing between the ceramic tube and the sealing electrode, wherein the ceramic tube and the sealing electrode are joined by melting the brazing ring.

The brazing ring of the surge absorber according to the present invention is characterized in that it is made of an alloy containing copper (Cu), silver (Ag) and zinc (Zn).

Further, the sealing electrode of the surge absorber according to the present invention is characterized by comprising a connecting portion which is inserted into the ceramic tube and projects inward so as to come into contact with the surge absorption element, and a joint portion which is engaged with the brazing ring.

The brazing ring of the surge absorber according to the present invention is characterized in that the outer surface of the brazing ring is located on the same line as the outer surface of the ceramic tube and the inner surface of the brazing ring extends inwardly from the inner surface of the ceramic tube.

The brazing ring of the surge absorber according to the present invention is characterized by comprising an outer peripheral portion joined to the ceramic tube and an inner peripheral portion joined to the end of the surge absorption element.

The surge absorber according to the present invention further comprises a brazing member which is melted between the connection portion and the terminal electrode to connect the connection portion and the terminal electrode.

In the surge absorber according to the present invention, at least one of the connecting portion, the connecting portion, and the terminal electrode may be formed of a material containing nickel (Ni) or titanium (Ti) so as to improve the bonding force and discharge characteristic by melting of the brazing ring or the brazing member And a plating layer.

A method of manufacturing a surge absorber according to the present invention includes the steps of: forming a ceramic tube having a surge absorption element therein; first and second electrodes inserted into both ends of the ceramic tube to be connected to the surge absorption element; A method for manufacturing a surge absorber comprising first and second brazing rings for joining a ceramic tube and first and second sealing electrodes, respectively, comprising the steps of: S1: providing the first sealing electrode; A step S2 of sequentially laminating a first brazing ring and a ceramic tube on the first sealing electrode; Inserting the surge absorption element into the ceramic tube; Sequentially stacking the second brazing ring and the second sealing electrode on the ceramic tube; And S5 in which the surge absorber having been subjected to steps S1 through S4 is placed in a chamber having an inert gas atmosphere and the first and second brazing rings are melted to seal between the ceramic tube and the first and second sealing electrodes .

Each of the first and second sealing electrodes of the method of manufacturing a surge absorber according to the present invention includes a connecting portion inserted into the ceramic tube and protruding inward to be in contact with the surge absorbing element, And each of the first and second brazing rings is inserted into a connection portion of each of the first and second sealing electrodes.

The first and second brazing rings of the method for manufacturing a surge absorber according to the present invention are made of an alloy (Ag25Cu) containing copper (Cu) and silver (Ag) on the surface of a copper alloy, 1 and 2, wherein the brazing ring is melted at a temperature of 800 to 850 ° C.

Further, the first and second brazing rings of the method for manufacturing a surge absorber according to the present invention are made of an alloy (Ag56CuZn) composed of silver, copper and zinc, and the step S5 is a step of heating the first and second brazing rings At a temperature of < / RTI >

In addition, a plating layer containing nickel (Ni) or titanium (Ti) may be formed on the surface of the joint portion of the method for manufacturing a surge absorber according to the present invention so as to improve the bonding force and discharge performance by melting of the first and second brazing rings And further comprising:

According to the surge absorber and the method of manufacturing the same according to the present invention having the above-described structure, since a ceramic tube of a ceramic material having excellent mechanical strength is used and the ceramic tube and the sealing electrode are bonded by the brazing ring, But also the ceramic tube can be tightly sealed.

Further, according to the surge absorber and the method for manufacturing the surge absorber according to the present invention, it is possible to stably use the surge absorber even at a high voltage as the sealing performance and durability are improved.

Further, according to the surge absorber and the method of manufacturing the same according to the present invention, it is possible to improve the wettability, bonding force, and discharge performance of the brazing ring by forming a plating layer in a region where brazing is performed.

1A and 1B are sectional views showing a surge absorption element according to the present invention.
2 is a cross-sectional view showing a first embodiment of a surge absorber according to the present invention.
3 is an exploded cross-sectional view showing a first embodiment of a surge absorber according to the present invention.
4 is a cross-sectional view showing a second embodiment of the surge absorber according to the present invention.
5 is a cross-sectional view showing a third embodiment of the surge absorber according to the present invention.
6 is a cross-sectional view showing a fourth embodiment of the surge absorber according to the present invention.
7A and 7B are sectional views showing a fifth embodiment of the surge absorber according to the present invention.
8A to 8F are cross-sectional views illustrating steps of a method for manufacturing a surge absorber according to an embodiment of the present invention.
9 is a cross-sectional view showing a state in which a surge absorber according to the present invention is surface-mounted on a substrate.
10 is a cross-sectional view showing the structure of a conventional surge absorber.

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

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, the definition should be based on the contents throughout this specification.

FIG. 2 is a cross-sectional view showing a first embodiment of a surge absorber according to the present invention, and FIG. 3 is a cross-sectional view of a surge absorber according to the present invention. 1 is an exploded sectional view showing an embodiment.

1 to 3, the surge absorber 100 according to the present invention includes a ceramic tube 120, a sealing electrode 130, a surge absorption element 110, a brazing ring 150, .

The surge absorber 100 according to the present invention includes a ceramic tube 120 having an inert gas filled therein and a plurality of lead wires 170 provided at both ends of the ceramic tube 120, A surge absorption element 110 accommodated in the ceramic tube 120 and electrically connected to the sealing electrodes 130 and having a discharge gap 115 formed therein; And a brazing ring 150 that seals between the ceramic tube 120 and the sealing electrode 130.

1A, a surge absorption element 110 according to the present invention includes a non-conductive member 111, a conductive coating 113 that surrounds the non-conductive member 111, and a conductive coating 113, A discharge gap 115 for dividing the conductive coating 113 at the center of the conductive coating 113 so as to be used as a discharge electrode and a discharge gap 115 provided at both ends of the nonconductive member 111, And a terminal electrode 117 electrically connecting the electrodes 110 and 110 to each other.

The nonconductive member 111 may be formed of a tubular alumina rod. The conductive coating 113 is used as a discharge electrode and may be made of a metal having a high electrical conductivity such as nickel (Ni) or titanium (Ti).

1B, the surge absorption element 110a according to the present invention includes a non-conductive member 111, a conductive coating 113 that surrounds the non-conductive member 111, and a conductive coating 113 A plurality of discharge gaps 115a and 115b for dividing the conductive film 113 and the protective film 114 and a plurality of discharge gaps 115a and 115b provided at both ends of the nonconductive member 111, And a terminal electrode 117 for electrically connecting the surge absorption element 110 and the surge absorption element 110 to each other. As described above, the surge absorption element according to the present invention can be configured in various forms in consideration of the use and characteristics of the product.

Here, the protective layer 114 is formed of a conductive ceramic thin film and is provided to surround the exposed surface of the conductive coating, thereby preventing the discharge energy generated in discharging the gas from being transferred to the conductive coating.

The protective layer 114 may be formed of a conductive ceramic having a high covalency such as a conductive oxide, a conductive nitride, an electrically conductive carbide, a conductive fluoride, and an electrically conductive silicide.

The ceramic tube 120 according to the present invention has a cylindrical shape and is made of a ceramic material. A sealing electrode 130 is provided at both ends of the tubular ceramic tube 120 and an inert gas is accommodated in the ceramic tube 120 sealed by the sealing electrode 130. Both ends of the ceramic tube 120 are brazed to the sealing electrode 130.

The sealing electrode 130 is installed at both ends of the ceramic tube 120 and electrically connected to the lead wire 170 as described above.

The sealing electrode 130 may be formed of a copper alloy.

The sealing electrode 130 includes a connecting portion 133 inserted into the ceramic tube 120 and protruding inward to be in contact with the surge absorption element 110 and a bonding portion 131 joined to the brazing ring 150 Can be exemplified.

Since the connection part 133 protrudes inward, the sealing electrode 130 can easily be assembled with the brazing ring 150 or the ceramic tube 120. In the brazing process, the ceramic tube 120, The surge absorption element 110 can be pressed and the electrical connection between the sealing electrode 130 and the connection part 133 is excellent.

The brazing ring 150 according to the present invention is melted between the ceramic tube 120 and the sealing electrode 130 as a base material, and serves as a filler metal for bonding and sealing both base metals.

The brazing ring 150 may be made of an alloy including copper (Cu), silver (Ag), and zinc (Zn).

The brazing process is performed at a temperature lower than the melting point of the ceramic tube and the sealing electrode, which are materials of the melting point of the brazing ring, which is a filler material.

In the bonding by brazing, wetting (property indicating the degree of affinity between the filler and the base material) becomes an important factor. That is, if the wettability between the brazing ring and the ceramic tube and the sealing electrode is poor, the bonding can not be performed. Therefore, in the present invention, a ceramic tube tube of a ceramic material excellent in wettability is used instead of conventional glass in which the tube tube containing the surge absorption element is poor in wettability with the filler.

Since the brazing ring 150 is melted to cause a capillary action on the surfaces of the ceramic tube 120 and the sealing electrode 130, outstanding. In addition, the joining by the brazing ring can seal the inside of the ceramic tube tube thoroughly and has an advantage of excellent impact resistance against vibration and the like.

The outer surface 151 of the brazing ring 150 is located on the same line as the outer surface 151 of the ceramic tube 120 and the inner surface 152 of the brazing ring 150 is extended inward than the inner surface of the ceramic tube 120. The sealing performance can be improved.

As described above, the surge absorber according to the present invention uses not only a conventional ceramic tube tube made of a glass material but also a ceramic material tube having excellent mechanical strength, but also a ceramic tube tube and a sealing electrode bonded together by a brazing ring. Not only significantly increases but also the ceramic tube can be tightly sealed. As the durability of the surge absorber increases, it can be used stably at high voltage.

4 is a cross-sectional view showing a second embodiment of the surge absorber according to the present invention.

Referring to FIG. 4, the surge absorber 100a according to the present invention may further include a brazing member 160 for bonding the connection portion 133 and the terminal electrode 117 to each other.

The brazing member 160 may have a plate shape and may be made of an alloy including copper (Cu), silver (Ag), and zinc (Zn).

The brazing member 160 is melted between the connection portion 133 and the terminal electrode 117 like the brazing ring to bond the connection portion 133 and the terminal electrode 117 together.

Therefore, the durability of the surge absorber can be improved by more firmly coupling the surge absorption element 110 and the sealing electrode 130 by the brazing member 160.

5 is a cross-sectional view showing a third embodiment of the surge absorber according to the present invention.

5, the brazing ring 150a of the surge absorber 100b according to the present invention can be configured to simultaneously bond the ceramic tube 120 and the surge absorption element 110 at the same time.

That is, the brazing ring 150a includes an outer circumferential portion 153 which is joined to an end of the ceramic tube 120, an inner circumferential portion 154 which is specifically joined to the terminal electrode 117 of the surge absorption element 110, ≪ / RTI >

Therefore, it is preferable that the brazing ring 150a is formed to be equal to or thicker than the thickness of the connection portion 133a. This is because the brazing ring 150a must be formed thicker than the thickness of the connecting portion 133a so that it can be bonded to the ceramic tube 120 and the terminal electrode 117 after melting.

In addition, the inner peripheral portion 154 of the brazing ring 150a is formed to extend longer inward than the brazing ring of FIG. 2, and the connection portion 153 is preferably formed to be narrower than the connection portion of FIG.

6 is a cross-sectional view showing a fourth embodiment of the surge absorber according to the present invention.

6, the surge absorber 100c according to the present invention may further include a plating layer 180 to improve wetting of the brazing ring 150 or the brazing member 160 with the base material .

Specifically, the plating layer 180 (181, 183, 185) is formed on at least one of the connecting portion 133, the bonding portion 131 and the terminal electrode 117, and the bonding strength by melting of the brazing ring 150 or the brazing member 160 And to improve discharge characteristics.

The plating layer 180 preferably includes nickel (Ni) or titanium (Ti), and may be formed of a compound such as Ni ₃ P.

7A and 7B are cross-sectional views showing a fifth embodiment of the surge absorber according to the present invention.

7A and 7B, the sealing electrode 130b according to the present invention can be formed in a flat plate shape in which the connecting portion is not protruded inward, unlike the sealing electrodes in FIGS.

The brazing ring 150b may be formed in a flat plate shape so that the end of the ceramic tube 120 and the terminal electrode 117 can be joined together at the same time.

The brazing ring 150c may be formed in a ring shape having a hollow central region so that the sealing electrode 130 and the terminal electrode 117 are directly connected to each other (see FIG. 7B).

Hereinafter, a method of manufacturing a fuse resistor according to the present invention will be described in detail with reference to the accompanying drawings.

8A to 8F are cross-sectional views illustrating steps of a method for manufacturing a surge absorber according to an embodiment of the present invention.

The method for manufacturing the surge absorber 100 according to the present invention includes the steps of inserting the ceramic tube 120 into which the surge absorption element 110 is accommodated and the ceramic tube 120 inserted into both ends of the ceramic tube 120 First and second sealing electrodes 130 and 135 connected to the surge absorption element 110 and first and second sealing electrodes 130 and 135 for joining the ceramic tube 120 and the first and second sealing electrodes 130 and 135, And may include brazing rings 150 and 155.

Referring to FIG. 8A, step S1 is a step of providing a first sealing electrode 130. The first sealing electrode 130 is inserted into the ceramic tube 120 and connected to the surge absorption element 110 A connecting portion 133 protruding inward to be connected to the first brazing ring 150, and a joint portion engaged with the first brazing ring 150.

Next, referring to FIG. 8B, step S2 is a step of sequentially laminating the first brazing ring 150 and the ceramic tube 120 on the first sealing electrode 130.

The first brazing ring 150 is inserted into the connection part 133 of the first sealing electrode 130 and the ceramic tube 120 is mounted on the first brazing ring 150.

Next, referring to FIG. 8C, step S3 is a step of inserting the surge absorption element 110 into the ceramic tube 120.

Here, the surge absorption element 110 includes a non-conductive member 111, a conductive coating 113 that surrounds the non-conductive member 111, and a conductive coating 113 covering the conductive coating 113, A discharge gap 115 for dividing the conductive film at the center of the conductive film 113 and a discharge gap 115 provided at both ends of the nonconductive member 111 to electrically connect the first and second sealing electrodes 130 and 135 and the surge absorption element 110 And first and second terminal electrodes 117 and 117a electrically connected to each other.

The first terminal electrode 117 of the inserted surge absorption element 110 is placed on the upper surface of the connection portion 133 of the first sealing electrode 130. A gap G or gap may be formed between the inner surface of the first terminal electrode 117 and the non-conductive film 113. The gap or gap may be formed by a compression And the brazing process of step S5. These gaps or gaps may occur naturally during the assembly of the surge absorption element, or may be artificially formed.

Next, referring to FIG. 8D, step S4 is a step of sequentially laminating the second brazing ring 155 and the second sealing electrode 135 on the ceramic tube 120.

The surge absorber in an unsealed state is assembled through steps S1 through S4.

Next, in step S5, the surge absorber 100 having been subjected to steps S1 through S4 is placed in a chamber C of an inert gas atmosphere, and the first and second brazing rings 150 and 155 are melted, Sealing between the first sealing electrode 120 and the first and second sealing electrodes 130 and 135.

Referring to FIG. 8E, a surge absorber 100 in an unsealed state is injected into the chamber C while standing vertically. Then, the chamber C is evacuated to remove air in the atmosphere, and then an inert gas is supplied.

At this time, the surge absorber 100 is in a state before being sealed, and the inert gas is introduced into the ceramic tube.

Referring to FIG. 8F, the inside of the chamber C is heated to melt and seal the first and second brazing rings 150 and 155. The first and second sealing electrodes 130 and 135 and the ceramic tube 120 are heated to a temperature below the melting point so that the base material is not deformed in the chamber C. In this case, For example, within the range of 500 to 850 DEG C, depending on the material of the substrate. For example, when the first and second brazing rings 150 and 155 are made of an alloy (Ag25Cu) containing copper and silver, the alloy is heated to a temperature of 800 to 850 DEG C, and an alloy of silver, copper and zinc (Ag56CuZn ), It is heated to a temperature of 600 to 650 ° C.

The heated first and second brazing rings 150 and 155 are melted to seal and bond the surface of the base material by capillary phenomenon, and the thickness thereof is reduced. Then, by joining the lead wire to the outer surface of the sealing electrode, the manufacture of the surge absorber is completed.

9 is a cross-sectional view showing a state in which a surge absorber according to the present invention is surface-mounted on a substrate.

Referring to FIG. 9, the surge absorber 100a of the present invention can be connected to the solder ball by omitting the lead wire and can be used as a surface mount device (SMD).

As described above, in the method of manufacturing a surge absorber according to the present invention, a ceramic tube made of a ceramic material having excellent mechanical strength is used, and the ceramic tube and the sealing electrode are bonded by the brazing ring, so that the bonding strength and durability are excellent.

As described above, in the method of manufacturing a surge absorber according to the present invention, a ceramic tube of a ceramic material having excellent mechanical strength is used, and a ceramic tube and a sealing electrode are bonded by a brazing ring, It can be tightly sealed. Therefore, the method of manufacturing a surge absorber of the present invention is advantageous in that a surge absorber that can be stably used at a high voltage can be manufactured as the ceramic tube is thoroughly sealed and durability is increased.

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: surge absorber 110: surge absorber
111: non-conductive member 113: conductive film
115: discharge gap 117: terminal electrode
120: Ceramic tube 130: Sealing electrode
131: connection part 133: connection part
150: Brazing ring 151: Outer surface
152: inner surface 153: outer periphery
154: Inner main part 160: Brazing member
170: Lead wire 180: Plated layer
181: bonding part plating layer 183: connection part plating layer
185: terminal electrode plating layer

Claims (4)

A ceramic tube tube filled with an inert gas and made of a ceramic material;
A pair of sealing electrodes provided at both ends of the ceramic tube and made of a metal material and formed in a flat plate shape;
A terminal electrode accommodated in the ceramic tube and electrically connected to the sealing electrode; a surge absorption element having a discharge gap formed therein;
And a brazing ring inserted and sealed between the ceramic tube and the sealing electrode,
Wherein the inserted brazing ring is made of an alloy containing at least silver and copper so that the ceramic tube tube made of the ceramic material and the sealing electrode made of the metal material can be tightly bonded,
Wherein the inner diameter of the brazing ring is larger than the outer diameter of the terminal electrode and smaller than the inner diameter of the ceramic tube. The method according to claim 1,
Wherein the brazing ring is made of an alloy (Ag25Cu) containing copper (Cu) and silver (Ag), and is melted at a temperature of 800 to 850 占 폚. The method according to claim 1,
Wherein the brazing ring is made of an alloy (Ag56CuZnSn) comprising silver, copper, zinc and tin and is melted at a temperature of 600 to 650 占 폚. The method according to claim 1,
Wherein the sealing electrode further comprises a plating layer containing nickel (Ni) or titanium (Ti) so as to improve bonding force and discharge performance by melting of the brazing ring.

Images