JP3141883U - Interrupting high temperature multilayer resistor - Google Patents

Abstract

Disclosed is an interrupting high-temperature multilayer resistor that detects a high temperature and automatically avoids damage caused by an overcurrent of a connected electronic member by interrupting a circuit to protect the electronic member.
A ceramic rod 45, two metal caps 43 provided at both ends of the ceramic rod, and a plurality of caps provided between the two caps on the outer peripheral wall of the ceramic rod, each having a different melting point and resistance value. It has the metal coatings 41 and 42 of this.
[Selection] Figure 2

Description

  In particular, the present invention relates to a high-temperature multilayer resistor that protects an electronic member by detecting a high temperature and automatically shutting off an electric circuit before the connected electronic member is damaged due to overheating.

  Electronic components such as capacitors and resistors are provided on the circuit board inside the electronic device. When a current is passed through the electronic device for a long time, a high temperature is generated and the electronic components such as the capacitor and resistor of the circuit board are generated. The material may explode and be damaged. Further, the explosion may damage other electronic members provided on the circuit board.

  However, until now there has been no ideal means for preventing overheating of the electronic member.

  Therefore, the present invention has been devised, and when an electronic member such as a nearby capacitor or resistor connected rises to a predetermined temperature, it is almost insulated and flows to an adjacent electronic member. It aims at providing the interruption | blocking type high temperature multilayer resistor which prevents the damage of the electronic member by the continuous temperature rise by interrupting | blocking an electric current.

The invention of claim 1 of the present application comprises a ceramic rod,
Two metal caps provided at both ends of the ceramic rod;
An interrupting high-temperature multi-layer resistor provided between the two caps on the outer peripheral wall of the ceramic rod and having a plurality of metal films each having a different melting point and resistance value; provide.

  In the invention of claim 2 of the present application, the plurality of coating films are concentric, the coating film positioned in the outer layer encapsulates the coating film positioned in the inner layer, and the coating film positioned in the outer layer is coated with the coating film positioned in the inner layer. The interrupting high-temperature multilayer resistor according to claim 1, which has a low melting point and a low resistance value.

  The invention of claim 3 of the present application is characterized in that the plurality of coatings are composed of a coating located in an inner layer made of nickel and an outer coating made of tin enclosing the outer side of the coating of the inner layer. The interruption type high temperature multilayer resistor according to claim 2 is provided.

  The invention according to claim 4 of the present application provides the interrupting high-temperature multilayer resistor according to claim 1, wherein the plurality of coating films are alternately provided on the peripheral wall of the ceramic rod.

  The present invention solves the above-described problems, and according to the above means, the electronic member and the adjacent electronic member to be connected are normally energized, but the temperature of the electronic member and the interrupting high-temperature multilayer resistor is not limited. When the temperature rises above a predetermined temperature, the outer layer film having a low melting point and a low resistance value is divided by melting, and the resistance value of the interrupting high temperature multilayer resistor is greatly increased and flows to the electronic member. Current is cut off. Therefore, according to this configuration, the electronic member can be prevented from being damaged due to a continuous temperature rise. Therefore, it can be said that the interrupting high-temperature multilayer resistor of the present invention has extremely excellent safety.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following Example is only what showed the preferred embodiment of this invention, and the technical scope of this invention is not limited to the following Example itself at all.

  FIG. 1 is a side cross-sectional view showing a use state of a breaking type high-temperature multilayer resistor according to the present invention, and FIG. 2 is a partial side sectional enlarged view of the breaking type high-temperature multilayer resistor according to the present invention. FIG. 4 is a partially enlarged side sectional view showing a state in which the outer layer film having a low melting point is melted into a liquid state in the interrupting high temperature multilayer resistor, and FIG. 4 is an interrupting high temperature multilayer resistor according to the present invention. It is a plane sectional view of other examples.

  As shown in FIG. 2, the first embodiment of the interrupting high-temperature multilayer resistor (40) according to the present invention includes a ceramic rod (45) and two metal plates provided at both ends of the ceramic rod (45). It has one cap (43) and a plurality of coats (41) (42).

  The coatings (41) and (42) are provided between the two caps (43) on the outer peripheral walls at both ends of the ceramic rod (45). More specifically, the coatings (41) and (42) are positioned on the outer layer so as to have a concentric shape. 42) encapsulates the coating (41) located in the inner layer. The coatings (41) and (42) are made of different metals, metal compounds or metal mixtures, respectively, and the coating (42) located in the outer layer has a lower melting point and lower resistance than the coating (41) located in the inner layer. It has a value.

  The inner layer film (41) is made of nickel having a melting point of 1450 degrees Celsius and a resistance value of 500 ohms or more, and the outer layer film (42) has a melting point of 232 degrees Celsius and a resistance of 5 ohms or more. Preferably, it is made of tin having a value, and according to this configuration, when the interrupting high-temperature multilayer resistor (40) is placed at a normal operating temperature, the coating (42) has a low resistance. Because of the value, the current can flow smoothly through the interrupting high-temperature multilayer resistor (40). At this time, the interruption type high temperature multilayer resistor (40) is for energization, and is connected to the high temperature automatic interruption type multi-film resistor (40) as shown in FIG. It does not change the resistance value of (30).

  Further, as shown in FIG. 1, in the embodiment of the present invention, the interrupting high-temperature multilayer resistor (40) is connected to the electronic member (30), together with the explosion-proof case (10) and the explosion-proof material (not indicated). The module is configured. The explosion-proof case (10) has a square and hollow shape and is made of a strong ceramic material having an insulating property. A storage chamber (not shown) is formed inside the explosion-proof case (10). Two lead holes (not labeled) are drilled. According to this configuration, the explosion-proof case (10) can prevent the debris from being scattered outside the storage chamber due to the explosion of the resistor, so that there is no possibility of damage to the surrounding electronic members.

  The electronic member (30) provided in the accommodation chamber of the explosion-proof case (10) is, for example, a resistor or a capacitor, and extends to the outside from the lead hole of the explosion-proof case (10) at both ends of the electronic member (30). One lead (31) to be taken out is provided, and the lead (31) may be connected to the circuit board by soldering, for example, or another connection method may be used. The interrupting high-temperature multilayer resistor (40) is installed on any one of the two leads (31), and a part of the one lead (31) is replaced. Therefore, the lead (31) is divided into two parts, and the two parts are connected between the two parts.

  The explosion-proof material is made of, for example, an insulating material such as cement. After the electronic member (30) and the interrupting high-temperature multilayer resistor (40) are installed in the storage chamber of the explosion-proof case (10), the explosion-proof material is used. By filling the material and fixing the electronic member (30) and the interrupting high-temperature multilayer resistor (40), scattering of debris due to explosion of the electronic member (30) is prevented.

  As shown in FIGS. 1 and 3, when the temperature of the electronic member (30) and the interrupting high-temperature multilayer resistor (40) rises and the electronic member (30) may explode, the interrupting-type The outer layer coating (42) in the high-temperature multilayer resistor (40) melts into a fluid, and the fluid tin is separated from each other so as to be pulled back to the cap (43) by the action of intermolecular force. The inner layer coating (41) in the interrupting high-temperature multilayer resistor (40) becomes two metal fluids (42a) and tries to play a role of energization, but the inner layer coating (41) has a resistance value of Since it is high, the interruption type high temperature multilayer resistor (40) is almost insulative, and the electric current is interrupted in the electronic member (30). Therefore, if said structure is used, the damage of the other electronic member located around by the explosion of the said electronic member (30) can be prevented.

  The connection relationship and operating principle of the interrupting high-temperature multilayer resistor (40) are as follows.

  1. A breaking type high temperature multilayer resistor (40) provided with coatings (41) and (42) made of different metals is connected to the electronic member (30), and the electronic member (30) is connected to the breaking type high temperature multilayer resistor. Set to the same temperature as (40). The coating (42) contributes to energization because it has a low melting point and a low resistance value, but the other coating (41) has a higher melting point and higher resistance than the coating (42). Does not contribute.

  2. When the electronic member (30) and the interrupting high-temperature multilayer resistor (40) exceed a predetermined temperature, the low melting point and low resistance film (42) is melted and divided, and the remaining film ( Since 41) has a high melting point and a high resistance value, it does not contribute to energization, so that the current flowing through the electronic member (30) is cut off.

  As shown in FIG. 4, the second embodiment of the interrupting high-temperature multilayer resistor (40) according to the present invention is substantially the same as the first embodiment, but the coatings (41) and (42) are the same. They are different in that they are alternately provided on the peripheral wall of the ceramic rod (45).

  As described above, the interrupting high-temperature multilayer resistor (40) is normally energized, but the electronic member (30) and the interrupting high-temperature multilayer resistor (40) rise to an abnormal temperature. Then, the film (42) having a low melting point and a low resistance value is divided by melting, and the resistance value of the interrupting high-temperature multilayer resistor (40) is significantly increased and flows to the electronic member (30). Current is interrupted. Therefore, according to this configuration, it is possible to prevent the electronic member from being damaged due to a continuous temperature rise.

  Since the present invention has the above-described configuration, when an electronic member such as a nearby capacitor or resistor connected to the breaking high temperature multilayer resistor rises to a predetermined temperature, the breaking high temperature multilayer resistor is substantially insulated. By blocking the current flowing through the adjacent electronic member as a state, it is possible to prevent the electronic member from being damaged due to a continuous temperature rise.

It is a fragmentary sectional side view which shows the use condition of the interruption | blocking type high temperature multilayer resistor which concerns on this invention. It is a partial side surface expanded sectional view of the interruption | blocking type high temperature multilayer type resistor which concerns on this invention. It is a partial side surface expanded sectional view which shows the state which the coating of the outer layer which is low melting | fusing point in the interruption | blocking type high temperature multilayer resistor which concerns on this invention melt | dissolved, and became a liquid state. It is a plane sectional view of other examples of interception type high temperature multilayer resistor concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Explosion-proof case 30 Electronic member 31 Lead wire 40 Interruption type high temperature multilayer resistor 41 Coating 42 Coating 42a Metal fluid 43 Cap 45 Ceramic rod

Claims (4)

Ceramic rods,
Two metal caps provided at both ends of the ceramic rod;
A breaking type high-temperature multilayer resistor provided between the two caps on the outer peripheral wall of the ceramic rod and having a plurality of metal films each having a different melting point and resistance value. The plurality of films are concentric, the film located in the outer layer encapsulates the film located in the inner layer, and the film located in the outer layer has a lower melting point and lower resistance than the film located in the inner layer The interrupting high-temperature multilayer resistor according to claim 1, wherein 3. The blocking type according to claim 2, wherein the plurality of coatings include a coating positioned in an inner layer made of nickel and a coating of an outer layer made of tin that encloses the outer side of the coating of the inner layer. High temperature multilayer resistor. 2. The interrupting high-temperature multilayer resistor according to claim 1, wherein the plurality of coatings are alternately provided on the peripheral wall of the ceramic rod.

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