KR20210010772A - Thermal fuse resistor - Google Patents

Abstract

Provided is a temperature fuse resistor with an explosion-proof function, which can block current when the internal temperature rises or overcurrent flows. The temperature fuse resistor with an explosion-proof function comprises: a hollow tube-shaped housing composed of an insulator; a first electrode and a second electrode coupled to both end portions of the housing, respectively; a first wire and a second wire connected to the first electrode and the second electrode, respectively; a first fuse which includes an insulation rod composed of an insulator, a first electrode cap and a second electrode cap coupled to both ends of the insulation rod, respectively, and a resistance line wound on the outer circumferential surface of the insulation rod and having both ends connected to the first electrode cap and the second electrode cap, respectively, and is positioned within the housing to allow the first electrode cap to be connected to the first electrode; and a second fuse positioned within the housing to be disposed in series with the first fuse and including a conductive supporter coming in close contact with the second electrode cap and composed of a metal with a melting point lower than the resistance line, a conductive piston having both ends coming in contact with the conductive supporter and the second electrode, respectively, and an elastic member disposed between the conductive piston and the second electrode to apply elastic force to the conductive piston.

Description

Thermal fuse resistor with explosion-proof function

The present invention relates to a thermal fuse resistor having an explosion-proof function, and more particularly, to a thermal fuse resistor having an explosion-proof function capable of blocking current when an internal temperature rises or an overcurrent flows.

In general, a thermal fuse resistor is a device that prevents a current exceeding an allowable range from flowing through a circuit, and is melted and cut off when a current exceeding a predetermined current flows. In other words, the thermal fuse resistor accurately detects abnormal overheating of the device and quickly cuts off the circuit to provide various home appliances, portable devices, communication devices, office devices, vehicle-mounted devices, AC adapters, chargers, motors, batteries, and other electronics It is widely used in parts.

The thermal fuse resistor is equipped with a resistor and a thermal fuse, and the thermal fuse is largely classified into two by the thermal material, which is a soluble, and a fusible alloy-type thermal fuse using a low-melting-point alloy of conductivity and a thermal-sensitive material using a non-conductive thermal material. There is a remodeling thermal fuse. Such a thermal fuse is a non-return type temperature switch that operates when the ambient temperature rises abnormally and protects devices by cutting off current of the device or forming a conduction state in the passage. The temperature at which the non-return type temperature switch operates is determined by the thermosensitive material used, and is usually provided as a product as a protective part functioning in the range of 6O to 25O and the standard current in the range of 0.5A to 15A. It is an electrical protection means for reversing the conduction or cut-off state at a predetermined operating temperature to make the cut-off or conduction state.

In a thermal fuse resistor, a resistor and a thermal fuse are connected in series or in parallel, and when a current exceeding a specified value flows, the heat generated by the heat generation of the resistor is conducted to the thermal fuse and melted and cut off. To this end, a series-connected thermal fuse and a resistor are accommodated in a separate case, and a protection element is provided, and the function of a current fuse in which a circuit is shorted by an overcurrent to a thermal fuse in which the circuit is shorted by external heat generated from the device is sought. I am doing it.

Korean Patent Registration No. 10-1614123, (2016.04.14.)

The technical problem to be achieved by the present invention is to solve this problem, and relates to a thermal fuse resistor having an explosion-proof function capable of blocking current when an internal temperature rises or an overcurrent flows.

The technical problem of the present invention is not limited to the above-mentioned problems, and another technical problem that is not mentioned will be clearly understood by those skilled in the art from the following description.

The thermal fuse resistor having an explosion-proof function of the present invention includes a hollow tube-shaped housing made of an insulator, a first electrode and a second electrode respectively coupled to both ends of the housing, and the first electrode and the second electrode respectively. An insulating rod made of a connected first wire and a second wire, an insulator, a first electrode cap and a second electrode cap respectively coupled to both ends of the insulating rod, and the outer circumferential surface of the insulating rod is wound, and both ends are respectively the first electrode A first fuse comprising a cap and a resistance wire connected to the second electrode cap, and the first fuse is located inside the housing and the first electrode cap is connected to the first electrode, and the first fuse is located inside the housing and is in series with the first fuse. A conductive support formed of a metal having a melting point lower than that of the resistance wire, and a conductive piston having both ends in contact with the conductive support and the second electrode, and the conductive piston and the second electrode are disposed in close contact with the second electrode cap. And a second fuse including an elastic member interposed between electrodes to apply an elastic force to the conductive piston.

When the conductive support is melted, the conductive piston may move in the direction of the first fuse, and contact may be separated from the second electrode.

The conductive piston may be recessed inward in a surface contacting the conductive support to form a receiving groove in which the molten conductive support is accommodated.

One end of the conductive piston in contact with the conductive support may be in close contact with the inner peripheral surface of the housing.

The insulating rod may be formed of a hollow cylinder, and the first electrode cap and the second electrode cap may have a through hole communicating with the insulating rod.

A first coating layer applied to the outer circumferential surface of the first fuse except for both ends of the first electrode cap and the second electrode cap, and a first coating layer applied to the outer circumferential surface of the housing excluding the first and second wires. It may further include 2 coating layers.

The first coating layer may be in close contact with the resistance wire and the housing, respectively.

In the thermal fuse resistor having an explosion-proof function of the present invention, when an internal temperature rises rapidly or a current exceeding an allowable range flows, the current can be cut off. In addition, since the resistor and the fuse are integrally manufactured, a separate connection operation is unnecessary, and thus, workability can be improved during circuit configuration. In addition, since welding is unnecessary when connecting the resistor and the fuse, it is possible to prevent the trouble of welding and short-circuiting of the welding part.

1 is a perspective view of a thermal fuse resistor having an explosion-proof function according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the thermal fuse resistor of FIG. 1 taken in a longitudinal direction.
3 is an operation diagram of the thermal fuse resistor of FIG. 1 having an explosion-proof function.
4 is a partially enlarged perspective view of the thermal fuse resistor of FIG. 3 having an explosion-proof function.

Advantages and features of the present invention and methods for achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms. However, these embodiments are intended to complete the disclosure of the present invention, and those skilled in the art to which the present invention pertains. It is provided to fully inform the scope of the invention to the person, and the invention is only defined by the claims. The same reference numerals refer to the same elements throughout the specification.

Hereinafter, a thermal fuse resistor having an explosion-proof function according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

First, a thermal fuse resistor having an explosion-proof function according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is a perspective view of a thermal fuse resistor having an explosion-proof function according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the thermal fuse resistor having an explosion-proof function of FIG. 1 taken in a longitudinal direction.

The thermal fuse resistor 1 having an explosion-proof function according to an embodiment of the present invention is for blocking the current when the temperature of the circuit rapidly rises or overcurrent occurs, and the housing 10 and the first electrode 20 ), a second electrode 30, a first wire 21, a second wire 31, a first fuse 40 and a second fuse 50.

Specifically, the thermal fuse resistor 1 having an explosion-proof function of the present invention includes a hollow tube-shaped housing 10 made of an insulator, and a first electrode 20 and a second electrode respectively coupled to both ends of the housing 10 30, a first wire 21 and a second wire 31 connected to the first electrode 20 and the second electrode 30, respectively, an insulating rod 41 made of an insulator, and an insulating rod 41 ) The first electrode cap 42 and the second electrode cap 43 respectively coupled to both ends, and the outer circumferential surface of the insulating rod 41 are wound and both ends are respectively the first electrode cap 42 and the second electrode cap 43 A first fuse 40 connected to the first electrode 20 and a first fuse 40 that includes a resistance wire 44 connected to the housing 10 and is located inside the housing 10, and is located inside the housing 10. A conductive support 53, which is arranged in series with the first fuse 40, is in close contact with the second electrode cap 43, and is made of a metal having a melting point lower than that of the resistance wire 44, and both ends of the conductive support 53 and 2 A first comprising a conductive piston 51 in contact with the electrode 30 and an elastic member 52 interposed between the conductive piston 51 and the second electrode 30 to apply an elastic force to the conductive piston 51. It includes 2 fuse 50.

1, the thermal fuse resistor 1 having an explosion-proof function of the present invention includes a first electrode 20 and a second electrode 30 to which the first wire 21 and the second wire 31 are connected. They are coupled to both ends of the housing 10 made of an insulator, and a first fuse 40 and a second fuse 50 are disposed inside the housing 10. The first fuse 40 of the thermal fuse resistor 1 having an explosion-proof function serves as a resistor, and the second fuse 50 is a conductive piston 51 because the conductive support 53 is rapidly melted by overcurrent or heat. The elastic member 52 moves toward the conductive support 53 and is spaced apart from the second electrode 30 to block current.

That is, when the internal temperature of the thermal fuse resistor 1 having an explosion-proof function rises sharply or a current exceeding the allowable range flows, the conductive support 53 is melted and accommodated in the conductive piston 51, and thus, the conductive piston 51 is moved in the direction of the conductive support 53 by the elastic member 52 and is spaced apart from the second electrode 30 to short the circuit connection. Hereinafter, each component will be described in detail. .

The housing 10 forms an insulating rod 41 forming a first fuse 40, a first electrode cap 42, a second electrode cap 43, a resistance wire 44, and a second fuse 50 A unit unit that binds the conductive support 53, the conductive piston 51, and the elastic member 52 into one, and forms a cover of the thermal fuse resistor 1 having an explosion-proof function. The housing 10 is formed in a hollow tube shape with an accommodation space formed therein, and may be made of an insulator such as a synthetic resin injection product or ceramic. The housing 10 is described as an example that is formed in a cylindrical shape as shown in the drawings, but does not need to be limited to the shape shown in the drawings, and may have various shapes such as a polyhedron. The housing 10 accommodates the first fuse 40 and the second fuse 50 in an internal accommodation space. The housing 10 is formed of an insulator tube such as a ceramic material, and the first fuse 40 and the second fuse 50 accommodated therein are broken when overcurrent (overvoltage) flows, and even if a spark occurs, sparks, etc. It can prevent transmission to the outside. That is, the first fuse 40 and the second fuse 50 are sealed inside the ceramic housing 10 to prevent the risk of explosion due to spark due to overvoltage (overcurrent), and thus excellent explosion-proof function and stability. Has. In addition, the housing 10 is formed at both ends of a cylindrical shape, and the first electrode 20 and the second electrode 30 are coupled to both ends.

The first electrode 20 and the second electrode 30 are electrodes in contact with the first fuse 40 and the second fuse 50, and as shown in the drawing, both ends of the housing 10 are formed with open ends. Combined to seal the accommodation space. However, the shape is not limited to the shape shown in the drawings, and both ends of the housing 10 are not formed to be open, and the first electrode 20 and the second electrode 30 are formed with the first fuse 40 and the second fuse 50. ) May be coupled through the housing 10 in contact with. Subsequently, the first electrode 20 and the second electrode 30 are respectively coupled to the first wire 21 and the second wire 31 on the other side exposed to the outside. The first wire 21 and the second wire 31 are lines having electrical conductivity, and may be bonded to the first electrode 20 and the second electrode 30 by spot welding, laser welding, or soldering. . The first electrode 20 to which the first wire 21 is connected and the second electrode 30 to which the second wire 31 is connected are respectively coupled to both ends of the housing 10 to be accommodated in the housing 10. The fuse 40 and the second fuse 50 may be in contact, respectively.

The first fuse 40 is a resistor that generates heat by current flow, and includes an insulating rod 41, a first electrode cap 42, a second electrode cap 43, and a resistance wire 44. The first electrode cap 42 is positioned inside the housing 10 to be connected to the first electrode 20.

The insulating rod 41 is made of a ceramic material having a hollow cylindrical shape, and a first electrode cap 42 and a second electrode cap 43 made of conductors are coupled to both ends. The first electrode cap 42 and the second electrode cap 43 are formed in a cylindrical shape like the insulating rod 41, but have a shorter length than the insulating rod 41. In addition, the diameter of the first electrode cap 42 and the second electrode cap 43 is larger than the diameter of the insulating rod 41, and the diameter of the through hole 421 formed therein is equal to the outer diameter of the insulating rod 41 It is formed identically, and is coupled to both ends of the insulating rod 41 so that the through hole 421 communicates with the insulating rod 41. In this case, the resistance wire 44 winds the outer circumferential surface of the insulating rod 41 made of an insulator, and both ends connect the first electrode cap 42 and the second electrode cap 43, respectively.

The resistance wire 44 is for connecting the first electrode cap 42 and the second electrode cap 43 of the insulating rod 41, and wraps the outer circumferential surface in a spiral shape, and both ends thereof are connected to the first electrode cap 42 and the second electrode cap 43. 2 It is connected to the electrode cap 43. The resistance wire 44 may be formed of an alloy of iron (Fe) and nickel (Ni), and the melting characteristics and surge characteristics may be appropriately adjusted by adjusting the alloy ratio of iron and nickel. That is, if the alloy ratio of iron and nickel is adjusted, the breaking current of the resistance wire 44 can be adjusted high or low, so that the resistance wire 44 can be appropriately designed according to the application. The first coating layer 45 may be applied to the outer circumferential surface of the resistance wire 44, and the first coating layer 45 is a film applied to the outer circumferential surface of the first fuse 40, 1 Except for the electrode cap 42 and the second electrode cap 43, it is applied to the outer circumferential surfaces of the insulating rod 41 and the resistance wire 44 to make the insulating rod 41 and the resistance wire 44 in close contact with the resistance wire 44. If it is cut off by overcurrent, it can prevent fragments from flying. In addition, the first coating layer 45 is in close contact with the resistance wire 44 and the inner circumferential surface of the housing 10, respectively, so that heat of the resistance wire 44 can be quickly radiated to the outside.

The first fuse 40 including the insulating rod 41, the first electrode cap 42, the second electrode cap 43, and the resistance wire 44, the first electrode cap 42 is a second electrode It may be connected to 30 and disposed inside the housing 10 so as to be connected to the second fuse 50 to the second electrode cap 43.

The second fuse 50 is a device for shorting the circuit connection inside the thermal fuse resistor 1 having an explosion-proof function due to overcurrent or heat, and a conductive support body disposed in series with the first fuse 40 inside the housing 10 It includes 53 and a conductive piston 51 and an elastic member 52.

The conductive support 53 is made of a metal material for separating the first electrode 20 and the second electrode 30 by melting due to overcurrent or high temperature. The conductive support 53 is made of a metal material with a melting point lower than that of the resistance line 44, and has one end in close contact with the second electrode cap 43 and the other end in the housing 10 so that it is in close contact with the conductive piston 51. Is placed. The conductive support 53 may be formed of a lead or tin alloy having a melting point of 150° C. to 350° C. depending on the temperature for blocking current, for example, when the temperature for blocking the current is set to 250° C., It may be made of an alloy metal having a melting point of 250 ℃. The conductive support 53 thus formed melts when an excessive current flows or a temperature rises rapidly to reach a specific temperature, thereby separating the conductive piston 51 from the second electrode 30.

The conductive piston 51 is formed in a cylindrical shape and is disposed in the accommodation space so that one end and the other end are in contact with the conductive support 53 and the second electrode 30, respectively. The conductive piston 51 is disposed in the accommodation space, and one end in contact with the conductive support 53 may be disposed in close contact with the inner peripheral surface of the housing 10. In other words, the conductive piston 51 forms an extension part 54 in which a part of the outer circumferential surface of one end in contact with the conductive support 53 is extended toward the housing 10, and the extension part 54 is It can be supported in contact with the inner peripheral surface. In the conductive piston 51, the extension part 54 is supported on the inner peripheral surface of the housing 10 and can move in the longitudinal direction of the housing 10, which will be described later in detail. Meanwhile, the conductive piston 51 may have a receiving groove 511 formed therein. The receiving groove 511 forms an inner space of the conductive piston 51 and may be recessed into a surface in which the conductive support 53 contacts. In other words, the receiving groove 511 forms an inner space of the conductive piston 51, but the molten conductive support 53 may be accommodated by being openly formed so that one end contacting the conductive support 53 is exposed to the outside. An elastic member 52 is disposed on the outer peripheral surface of the conductive piston 51 formed as described above.

The elastic member 52 is formed of a kind of spring and is interposed between the conductive piston 51 and the second electrode 30 to apply an elastic force to the conductive piston 51. The elastic member 52 is disposed so as to surround the outer circumferential surface of the conductive piston 51 so that both ends thereof may be in close contact with one side surface of the extension part 54 and the second electrode 30, respectively. When the conductive support 53 is melted by continuously applying an elastic force to the conductive piston 51, the elastic member 52 flows into the receiving groove 511, thereby removing the conductive piston 51. 1 Moving in the direction of the fuse 40, the other end may be disconnected from the second electrode 30 to cut off the current, and this will be described in detail in the operation process.

Meanwhile, in the housing 10, a first fuse 40 and a second fuse 50 are arranged in series inside, the first electrode 20 and the second electrode 30 are coupled to both ends, and a second fuse is formed on the outer circumferential surface thereof. The coating layer 60 may be applied. The second coating layer 60 is a film applied to the outer peripheral surface of the housing 10 and may be thinly applied to the outer peripheral surface of the housing 10 except for the first wire 21 and the second wire 31.

Hereinafter, an operation process of the thermal fuse resistor 1 having an explosion-proof function of the present invention will be described in detail with reference to FIGS. 3 and 4.

3 is an operation diagram of the thermal fuse resistor having an explosion-proof function of FIG. 1, and FIG. 4 is a partially enlarged perspective view of the thermal fuse resistor of FIG. 3.

First, referring to FIG. 3, current flows through the first wire 21 and the first electrode 20 and flows out through the second electrode 30 and the second wire 31. The current flowing into the first electrode 20 is transferred to the resistance line 44 through the first electrode cap 42, and the resistance line 44 generates heat by current flow. When the temperature of the resistance line 44 rises rapidly due to the overcurrent and reaches a specific temperature, the conductive support 53 disposed in close contact with the second electrode cap 43 is melted. The conductive support 53 is melted when an overcurrent flows inside the housing 10 or when the temperature rises rapidly, the molten conductive support 53 enters the receiving groove 511. As shown enlarged in FIG. 4, the length of the conductive support 53 is gradually reduced as the molten portion of the conductive support 53 flows into the receiving groove 511. As a result, the conductive piston 51 moves toward the first fuse 40 by the elastic force of the elastic member 52, and the contact is separated from the second electrode 30 while moving toward the first fuse 40. Can be. In addition, the conductive piston 51 is completely separated from the second electrode 30 as the distance moving toward the first fuse 40 increases as the amount of the conductive support 53 melted and flows into the receiving groove 511 increases. Can be. In this way, in the thermal fuse resistor 1 having an explosion-proof function, when the internal temperature rises or an overcurrent flows, the conductive support 53 melts and flows into the receiving groove 511, so that the conductive support 53 becomes the second electrode ( 30) can be separated from the current cutoff. In particular, even if an overvoltage (overcurrent) flows inside the housing 10 and sparks occur, the housing 10 is formed of a ceramic material and is sealed, providing an explosion-proof function that prevents sparks from splashing or being transmitted to the outside. There are features that can be done.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains have found that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. You can understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

1: Thermal fuse resistor with explosion-proof function
10: housing 20: first electrode
21: first wire 30: second electrode
31: second wire 40: first fuse
41: insulating rod 42: first electrode cap
43: second electrode cap 44: resistance wire
45: first coating layer 50: second fuse
51: conductive piston 52: elastic member
53: conductive support 54: extension
60: second coating layer 421: through hole
511: receiving groove

Claims (7)

Hollow tubular housing made of insulator:
A first electrode and a second electrode respectively coupled to both ends of the housing;
A first wire and a second wire connected to the first electrode and the second electrode, respectively;
An insulating rod made of an insulator, a first electrode cap and a second electrode cap respectively coupled to both ends of the insulating rod, and a resistance wire wound around the outer peripheral surface of the insulating rod and connected to the first electrode cap and the second electrode cap, respectively And a first fuse positioned inside the housing and having the first electrode cap connected to the first electrode;
Located inside the housing, arranged in series with the first fuse, in close contact with the second electrode cap, a conductive support made of a metal having a melting point lower than that of the resistance wire, and both ends contact the conductive support and the second electrode, respectively A second fuse comprising a conductive piston and an elastic member interposed between the conductive piston and the second electrode to apply an elastic force to the conductive piston;
Thermal fuse resistor having an explosion-proof function comprising a. The method of claim 1,
The conductive piston is a thermal fuse resistor having an explosion-proof function in which when the conductive support is melted, it moves in a direction of the first fuse and contact is separated from the second electrode. The method of claim 2,
The conductive piston is a thermal fuse resistor having an explosion-proof function in which a receiving groove for receiving the molten conductive support is formed by being depressed inward on a surface contacting the conductive support. The method of claim 3,
The conductive piston is a thermal fuse resistor having an explosion-proof function in which one end in contact with the conductive support is in close contact with the inner circumferential surface of the housing. The method of claim 2,
The insulating rod is formed of a hollow cylinder, the first electrode cap and the second electrode cap is a thermal fuse resistor having an explosion-proof function having a through hole communicating with the insulating rod. The method of claim 1,
A first coating layer applied to the outer circumferential surface of the first fuse except for both ends of the first electrode cap and the second electrode cap, and a first coating layer applied to the outer circumferential surface of the housing excluding the first and second wires. 2 Thermal fuse resistor having an explosion-proof function further comprising a coating layer. The method of claim 6,
The first coating layer is a thermal fuse resistor having an explosion-proof function in close contact with the resistance wire and the housing, respectively.

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