KR101083023B1

KR101083023B1 - Repeatable temperature fuse

Info

Publication number: KR101083023B1
Application number: KR1020100027716A
Authority: KR
Inventors: 연세흠
Original assignee: (주)엠에스테크비젼; 아벨정밀(주)
Priority date: 2010-03-29
Filing date: 2010-03-29
Publication date: 2011-11-15
Also published as: KR20110108498A

Abstract

The present invention relates to a multi-time temperature fuse, and more particularly, it can be repeatedly reused and does not need to be replaced, and its structure is simple and easy to assemble so that it can be mass-produced as a small capacity temperature fuse, It is designed to protect the spring, extending the service life, and is easy to set the temperature of the dog-operated transition temperature, the multiple-time temperature fuse.
To this end, the present invention is a multi-temperature temperature fuse having a sliding portion 30, a shape memory spring 40 and a bias spring 50 in the inner space sealed by the body 10 and the insulating core 20, the insulation The core 20 is mounted in the opening of the body 10 by interference fit, the interference fit depth of the insulation core 20 is adjusted to adjust the opening temperature, and the lead pins 11 and 21 are insulated from the insulation core 20. And mounted in the form fitted to the body 10, it is configured to limit the maximum compression length of the bias spring (50).

Description

REPEATABLE TEMPERATURE FUSE}

The present invention relates to a multi-time temperature fuse, and more particularly, it can be repeatedly reused and does not need to be replaced, and its structure is simple and easy to assemble so that it can be mass-produced as a small capacity temperature fuse, It is designed to protect the spring, extending the service life, and is easy to set the temperature of the dog-operated transition temperature, the multiple-time temperature fuse.

In order to prevent damage to the circuit caused by the supply of overcurrent or short circuit current, electronic products install a temperature fuse that cuts off the current supply when overheated.

Such a temperature fuse is generally configured to allow the molten conductor to melt and disconnect when it is energized through the molten conductor and overheated by an overcurrent or a short circuit current. Recently, a temperature fuse that can be mounted on a printed circuit board has also been developed, and the temperature fuse to be mounted in this way is configured to be reused repeatedly to solve a problem that cannot be reused when the melted conductor is melted.

1 is a technology related to a temperature fuse created by the present applicant and registered as Patent No. 10-0912215, which is formed in a tubular shape in which one side is opened and the other side is closed and made of a conductive material; The base 62 blocking the opening of the body 60, the protrusion 64 protruding into the body 60, the interior of the body 60 communicates with the outside, and is inserted into the base 62 in a biased manner. An insulating core composed of a losing terminal 63; A sliding part 30 accommodated in the body 60 and having a contact pin 73 projecting in the direction of the base 62; A first spring 70 extrapolated to the contact pin 73; A second spring 71 fitted between the sliding portion 30 and the closed opening of the body 60; A lead terminal 61 electrically connected to the terminal 63 of the insulating core; It consists of. The lead terminal 61 and the body 60 are soldered to the surface of the circuit board to be mounted.

In this case, any one of the first and second springs 70 and 71 is formed of a shape memory alloy and the other is formed of a general spring, so that the terminal 63 and the contact pin 31 are in contact with each other at a low temperature. When the temperature rises above the transition temperature, the terminal 63 and the contact pin 31 are spaced apart from each other. In this manner, when the temperature rises above the transition temperature, electricity can be cut off. When the temperature decreases, the terminal 63 and the contact pin 31 are brought into contact with each other when the temperature decreases, and thus, repeated use is possible.

However, the technique is not configured so that the general spring mounted therein does not reach the yield point, so that when the temperature rises rapidly to an excessive temperature, the yield point may no longer function as a normal spring. have. This is because the normal spring does not return to its original state even if the crimp is released when the yield point is reached. In addition, since it is cumbersome to replace the temperature fuse mounted on the circuit board, it is desirable to mount the temperature fuse having excellent durability if possible, so it is preferable to protect the general spring to prolong the service life.

In addition, the above-described technique is difficult to manufacture, since the lead terminals connected to the circuit board are separately mounted, and in order to mount on the surface of the circuit board, it is preferable to configure the lead terminal in the form of a pin. No lead terminal was constructed. In general, a fuse mounted on the surface of a circuit board has a capacity of mA unit, or a number A, and should be made very small for high integration. According to the above technique, the lead terminal is separately mounted, and thus the insulation core 20 ) Was also complicated, making it difficult to make small.

In addition, the technique is not configured to adjust the operating temperature (transition temperature) with the opening of the spring formed of the shape memory alloy, it was also difficult to manufacture to have a desired operating temperature. That is, it is possible to adjust the operating temperature by adjusting the crimping degree of the first and second springs 70 and 71 in a low temperature state. In the above technique, the base 62 is configured to be attached to the body 60 to adjust the crimping degree. Since the length of the body 60 must be adjusted, there is a difficulty in manufacturing the body 60 of various lengths, or if the length of the terminal 63 is different, it is difficult to fit.

As described above, although the above-described technology is applied and registered by the present applicant, the present applicant has solved the above-mentioned problems and difficulties, and thus, the present invention has devised a present invention which can configure a temperature fuse more suitably for a printed circuit board.

KR 10-0912215 B1 2009.08.07.

Accordingly, an object of the present invention is to provide a durable multi-use temperature fuse that can be used for a long time by preventing the general spring mounted therein from reaching the yield point.

Another object of the present invention is to provide a multi-temperature temperature fuse that can be easily mounted on the surface of a circuit board, has a simple structure and is easy to assemble, and can be manufactured in a very small volume suitable for mounting a circuit board.

It is still another object of the present invention to provide a multiple-time temperature fuse which is easy to adjust the temperature value to be operated by a dog.

In order to achieve the above object, the present invention, the body (10) formed of a conductive material formed in the form of a tube closed on one side and the other side closed; An insulating core 20 mounted to the opening 13 of the body 10 and having an electrical contact on the other side thereof; A sliding part 30 interpolating into the body 10 and having a contact pin 31 protruding in one direction from which the contact pin 31 which is in contact with the electrical contact of the insulating core 20 is protruded in one direction; A shape memory spring (40) made of a shape memory alloy material which is extrapolated to the contact pin (31) and holds one side of the sliding portion (30) on the other end surface of the insulating core (20); And a bias spring 50 made of a conductive material for electrically connecting the other side of the sliding part 30 to the inner other side of the body 10 while being electrically connected to the shape memory spring. By 40, the contact pin 31 is characterized in that the contact or spaced apart from the electrical contact of the insulating core (20).

In addition, the body 10, the first lead pin 11 is characterized in that it is provided to continue on the outer side of the other side.

In addition, the insulating core 20 penetrates from one side to the other side, but forms a step 25 therein so that the diameter of the other portion is larger than the diameter of the one side, and the flange 22 serving as an electrical contact is placed on the other side. The second lead pin 21 provided is fitted in one direction so that the flange 22 is caught by the step 25, it is characterized in that it is mounted to the opening 13 of the body 10 by interference fit. .

In addition, the sliding part 30 protrudes the limit pin 32 in the other direction, extrapolates the bias spring 50 to the limit pin 32, and the contact pin 31 is the insulating core 20. Set the length of the limit pin 32 to move within the other hole of the limit, when the limit pin 32 touches the other side of the inside of the body 10, the amount of deformation of the bias spring 50 is limited It is characterized in that to set the length of the limit pin 32 so as not to exceed.

The body 10 may be formed to open the opening 13 on one side to smoothly fit the insulating core 20, and adjust the depth of interference of the insulating core 20 to adjust the transition temperature value. Adjusting, to form a lead pin through hole 14 on the other side,

The first lead pin 11 has a flange 12 fitted on the inside of the body 10 to be in close contact with the lead pin through hole 14 through the inside of the body 10. It is characterized in that the flange 12 is to be in close contact with the other inner surface of the body (10).

Therefore, the present invention configured as described above, limiting the maximum compression displacement of the bias spring 50 to the limit pin 32 so as not to reach the yield point, thereby protecting the elastic characteristics of the bias spring 50 to use for a long time Has the advantage.

In addition, the present invention is simple in structure, and in addition, the first lead pin 11, the bias spring 50, the sliding portion 30 and the shape memory spring 40 in the order of the body 10, Since the insulating core 20 in which the second lead pins 21 are inserted is also inserted into the opening 13 of the body 10, all the assembly processes will be simplified by the fitting process, and thus the circuit board can be easily assembled. It can be easily manufactured in a very small volume that can be mounted on.

In addition, the present invention because the insulating core 20 is fitted to the opening 13 of the body 10, it is possible to adjust the fitting depth, thereby having the advantage of controlling the transition temperature of the shape memory spring 40.

1 is a cross-sectional view of a conventional temperature fuse.
2 is an exploded perspective view of a multi-temperature fuse according to an embodiment of the present invention.
3 is a cross-sectional view of a multi-temperature fuse according to an embodiment of the present invention.
4 is a cross-sectional view showing an operating state of a multi-temperature fuse according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that, in the drawings, the same reference numerals are used to denote the same or similar components in other drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, 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.

2 is an exploded perspective view of a multiple-temperature fuse according to an embodiment of the present invention,

3 is a cross-sectional view of a multi-temperature fuse according to an embodiment of the present invention.

2 and 3, the multi-time thermal fuse according to an embodiment of the present invention, the tubular body 10, the insulating core 20, which is mounted on one side of the body 10, the body 10 Including a sliding part 30 accommodated in the interior, the shape memory spring 40 holding the one side of the sliding portion 30, and a bias spring 50 holding the other side of the sliding portion 30, including; It is composed.

In addition, the multi-temperature thermal fuse according to the embodiment of the present invention as a whole, the second lead pin 21 to be described later protrudes on one side of the body 10 and the first lead pin 11 to be described later is the body 10 of the It has a shape protruding on the other side, and thus can be mounted by bending the first and second lead pins 11 and 21, adjusting the length, and cutting and easily soldering to the circuit board.

Meanwhile, in describing an embodiment of the present invention, the direction in which the second lead pin 21 faces is defined as 'one side', and the direction in which the first lead pin 11 faces as the 'other side' is determined. Explain.

The body 10 is made of an electrically conductive material, is formed in the form of a tube opening one side 13 and closed the other side, the first lead pin 11 which is connected to the outer side of the other side Equipped.

In the embodiment of the present invention, the opening 13 portion on one side is formed to be open in one direction, that is, the one side portion is formed to have a shorter diameter toward the one side, so that the insulating core 20 to be described later is formed in the opening. When we cope with (13), we let you fit smoothly.

In addition, in the embodiment of the present invention, in order to more easily and firmly configure the body 10, the first lead pin 11 is mounted in the form of sandwiching the other side of the body (10). That is, after the flange 12 is formed on one side of the first lead pin 11 and the lead pin through hole 14 is formed through the other side of the body 10, the flange 12 is oriented in one direction. The first lead pin 11 is inserted into the lead pin through hole 14 through the inside of the body 10 so that the flange 12 is in close contact with the other inner surface of the body 10. . At this time, the flange 12 is preferably formed to fit the inner wall of the body 10 to be in close contact with the inner wall of the body 10. By forming the flange 12 in this way it is electrically connected to the body 10.

The insulating core 20 is made of an electrically insulating material, and penetrates from one side to the other side, and forms a step 25 therein so that the diameter of the other portion is larger than the diameter of the one portion. The through-hole on one side based on the step 25 is a lead pin insertion hole 23 into which the second lead pin 21 can be inserted, and the through-hole on the other side is a contact pin insertion hole through which the contact pin 31 to be described later can move. To be used as (24).

In addition, the flange 22 serving as an electrical contact is formed on the other side of the second lead pin 21, and the second lead pin 21 is disposed on the other side in the state in which the flange 22 faces the other direction. After passing through the pin insertion hole 24, the flange 22 is fitted in close contact with the lead pin insertion hole 23 on one side so that the flange 22 is caught by the step 25.

The insulating core 20 configured as described above is accommodated inside the body 10 in the order of the bias spring 50, the sliding part 30, and the shape memory spring 40, which will be described later. The lead pin 21 is pressed into the opening 13 of the body 10 in a state that the lead pin 21 is oriented in one direction. Accordingly, when one side direction is viewed from the inside of the body 10, the flange 22 of the second lead pin 21 is disposed inside the contact pin insertion hole 24.

As such, since the flange 22 is disposed inside the contact pin insertion hole 24, sparks generated when the flange 22 comes into contact with the contact pin, which will be described later, are used only at the contact pin insertion hole 24. Let it happen Thus, it is possible to block sparks from leading to the body 10.

The sliding part 30 is formed in the form of a plate made of an electrically conductive material, and protrudes in one direction a column-shaped contact pin 31 on one side, and the limit pin 32 in the form of a column on the other side. Protrude in the other direction.

The sliding part 30 configured as described above is inserted into the body 10 and slid in one direction or the other by the shape memory spring 40 and the bias spring 50 described later. That is, when the temperature inside the body 10 is low and sliding in one direction, one end of the contact pin 31 comes into contact with the flange 22 of the second lead pin 21 to be electrically energized. When the temperature rises above a predetermined temperature (transition temperature), the contact pin 31 falls off from the flange 22 by sliding in the other direction, thereby becoming an electrically disconnected state.

In this case, when the sliding part 30 slides inside the body 10, one end of the contact pin 31 may move in the contact pin insertion hole 24 of the insulating core 20. Do. For example, the distance from one end of the contact pin 31 to the other end of the limit pin 32 is the flange 12 of the first lead pin 11 from the other end of the insulating core 20. This is longer than the distance to one side of. By doing so, even if the sliding part 30 is moved, the end of the node pin 31 is guided by the contact pin insertion hole 24, so that it does not tilt.

On the other hand, the length of the limit pin 32 is preferably adopted so as not to exceed the limit deformation amount of the bias spring 50 to be described later. In general, the spring has an inherent elastic modulus applied to the linear section. In this linear section, the larger the compressive force is, the larger the deformation amount (displacement) is in proportion to the linear, and when the compressive force is released, the spring is restored to its original state. However, the limit compression force, which is the maximum point of the linear section, is called the yield point. When this yield point is exceeded, the linearity cannot be maintained. Moreover, even when the compression force is released, it cannot be restored to its original state, and thus cannot serve as a spring again.

Therefore, in the present invention, the length of the limit pin 32 is larger than the crimp length of the bias spring 50 when the yield point is reached, and accordingly, the bias spring (by expansion of the shape memory spring 40 to be described later) Even if 50 is pressed to reach the yield point, the other end of the limit pin 32 contacts the other side of the flange 12 of the first lead pin 11 fitted to the other side of the body 10 and no longer. This prevents the amount of deformation from increasing. Therefore, according to the present invention, since the bias spring 50 is protected by the limit pin 32, the bias spring 50 can be used for a long time.

The shape memory spring 40 is a spring formed of a shape memory alloy, and extrapolated to the contact pins 31 of the sliding part 30 accommodated in the body 10 to form one side of the sliding part 30. The other end surface of the insulating core 20 is touched.

The bias spring 50 is formed of a spring with less stretching occurs in accordance with the temperature change, is accommodated in the interior of the body 10 is extrapolated to the limit pin 32 of the sliding part 30, the sliding part The other side of the 30 is held on the other side inside the body 10. At this time, in the embodiment of the present invention, since the flange 22 of the second lead pin 21 is in close contact with the other inner surface of the body 10, the sliding part 30 is supported by the flange 22. .

The bias spring 50 is made of a conductive material and maintains contact with the sliding part 30 and the flange 22 even when the sliding part 30 is slid. And the flange 22 are electrically connected to each other.

Meanwhile, although not shown in FIGS. 2 and 3, the outer surface of the body 10 is preferably coated with an insulating material.

The flow path of electricity in the multiple-time temperature fuse configured as described above, the first lead pin 11, the flange 12 of the first lead pin 11, the bias spring 50, the sliding portion 30 in a low temperature state ), The contact pin 31 of the sliding part 30, the flange 22 of the second lead pin 21, and the second lead pin 21. In addition, since the bias spring 50 or the sliding part 30 may contact the inner wall of the body 10, the bias spring 50 or the sliding part 30 may contact the inner wall of the body 10. Electricity may flow through the inner wall.

Hereinafter, referring to FIG. 3 and FIG. 4, the switching operation of the multi-time temperature fuse according to the present invention will be described.

4 is a cross-sectional view illustrating an operating state of the multi-time temperature fuse according to the exemplary embodiment of the present invention, in which the sliding part 30 moves in the other direction so that the contact pin 31 is a flange 22 of the second lead pin 21. Can be seen as spaced apart. That is, the open state (OFF) to cut off the electricity.

When the shape memory spring 40 formed of the shape memory alloy has a transition temperature value specified by the material of the material and the shape of the spring, the deformation memory spring 40 may be deformed at a low temperature corresponding to less than the transition temperature. It has the property of returning to the shape of, specifically speaking, it exists in the marten-site state at low temperature and in the austenite state above the transition temperature, which is deformed by external force in the martensite state. Even if this occurs, when the transition temperature is higher, the transformation force to return to the stored state is generated and transforms into the austenite state. The transition temperature is determined according to the shape of the shape memory alloy and the shape of the shape memory alloy.

In the present invention, the shape memory spring 40 is formed in the form of a spring and extrapolated to the contact pin 31. Then, in the low temperature state, the shape memory spring 40 is deformed and compressed by the sliding portion 30 that is pressed by the bias spring 50, which will be described later, as shown in Figure 3, the sliding portion 30 ) Is moved in one direction to the closed state (ON) to contact the contact pin 31 to the flange 22 of the second lead pin 21, the first lead pin 11 and the second lead Electricity can flow between the pins 21.

Next, when overcurrent or short-circuit current flows through the flow path of electricity, heat is generated in the bias spring 50, the sliding part 30, and the contact pin 31, in particular, the bias spring 50. Because of the long flow path at and the small current passing cross section, much heat is generated here. In addition, a lot of heat is generated in a portion of the sliding portion 30 which is in contact with the bias spring 50 and in a portion of the flange 12 of the first lead pin 11 which is in contact with the bias spring 50. do.

The heat generated in this way increases the temperature of the respective components and the internal air inside the body 10, thereby heating the shape memory spring 40 by conduction or convection, the temperature of the shape memory spring 40 is transferred When the temperature is higher than the temperature, the transformation force to be stored in the shape memory spring 40 is generated. In addition, when the generated transformation force is greater than the elastic force of the bias spring 50, the sliding portion 30 is pushed in the other direction, as shown in FIG. 4, the contact pin 31 is the first 2 The lead pin 21 is turned off from the flange 22.

Next, when the electrical shut-off operation state as shown in Figure 4, the heat is no longer generated, instead, since the generated heat is discharged to the outside, the temperature of the shape memory spring 40 is lowered, the low temperature state When it is returned to the compressed state again to the closed state (ON) of FIG.

On the other hand, the body 10 is heated by an increase in external temperature instead of being heated by an overcurrent or short-circuit current, but the shape memory spring 40 is heated, as shown in FIG. In addition, when the shape memory spring 40, which has been heated due to the low external temperature, releases heat, the shape memory spring 40 returns to the compressed state again.

In addition, the present invention by adjusting the insertion depth of the insulating core 20 forcibly fitted in the opening 13 of the body 10, the flange 22 of the second lead pin 21 and the contact pin ( 31) The transition temperature value that turns off can be adjusted.

That is, when the insulating core 20 is deeply inserted, the compression degree of the bias spring 50 is increased, so that the pressure applied to the shape memory spring 40 is increased, so that the shape memory spring 40 is at a higher temperature. The shape memory spring is transformed into an austenite state only when heated, and the compression of the bias spring 50 decreases when the insulation core 20 is inserted low so that the pressure applied to the shape memory spring 40 decreases. Even if 40 is heated to a lower temperature, it is transformed into an austenite state.

Therefore, after acquiring the transition temperature data according to the fitting depth when the shape memory spring 40 formed of the shape memory alloy is forcibly fitted to the body 10, the fitting depth according to the obtained data during actual manufacture It is possible to mass-produce a multi-temperature temperature fuse having a desired transition temperature by controlling the temperature.

Although illustrated and described in the specific embodiments to illustrate the technical spirit of the present invention, the present invention is not limited to the same configuration and operation as the specific embodiment as described above, within the limits that various modifications do not depart from the scope of the invention It can be carried out in. Therefore, such modifications should also be regarded as belonging to the scope of the present invention, and the scope of the present invention should be determined by the claims below.

10 body 11 first lead pin 12 flange
13 opening 14 lead pin through hole
20: insulation core 21: second lead pin 22: flange
23: lead pin insertion port 24: contact pin insertion port 25: step
30: sliding part 31: contact pin 32: limit pin
40: shape memory spring 50: bias spring

Claims

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A body 10 formed in the form of a tube having one side opening 13 and the other side closed and made of a conductive material;
An insulating core 20 mounted to the opening 13 of the body 10 and having an electrical contact on the other side thereof;
A sliding part 30 interpolating into the body 10 and having a contact pin 31 protruding in one direction from which the contact pin 31 which is in contact with the electrical contact of the insulating core 20 is protruded in one direction;
A shape memory spring (40) made of a shape memory alloy material which is extrapolated to the contact pin (31) and holds one side of the sliding portion (30) on the other end surface of the insulating core (20);
A bias spring (50) of a conductive material for electrically connecting the other side of the sliding part (30) to the inner other side of the body (10);
In the multiple-time temperature fuse configured to include, the contact pin 31 is in contact with or spaced apart from the electrical contact of the insulating core 20 by the shape memory spring 40 is stretched in accordance with the temperature,

The body 10 is formed to open the opening 13, to form a lead pin through-hole 14 on the other side, the first lead pin 11 having a flange 12 on one side of the body ( 10 through the inside of the lead pin through-hole 14 so that the flange 12 is in close contact with the other inner surface of the body 10,
The insulating core 20 has a stepped portion 25 formed therein so as to penetrate from one side to the other side with a diameter larger than that of one side, and a flange 22 provided as an electrical contact on the other side. The second lead pin 21 is fitted in one direction so that the flange 22 is caught by the step 25, and is mounted as an interference fit in the opening 13 of the body 10 to adjust the interference fit depth. Adjust the transition temperature value of the shape memory spring 40,
The sliding part 30 protrudes the limit pin 32 in the other direction, extrapolates the bias spring 50 to the limit pin 32, and the contact pin 31 is the other side of the insulating core 20. The length of the limit pin 32 is set to move in the hole, but when the limit pin 32 touches the other side of the inside of the body 10, the deformation amount of the bias spring 50 does not exceed the limit deformation amount. Multi-use temperature fuse, characterized in that to set the length of the limit pin (32) not to.