JPS6057119B2 - Abnormal temperature detection line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an abnormal temperature detection line that can detect an abnormal rise in temperature by breaking itself.

Generally, methods for detecting abnormal temperatures indoors or inside equipment include:
There are following methods.

(1) A method of detecting the rise in ambient air temperature using bimetallic temperature detection devices placed in spots.

With this method, the detection range is limited to the vicinity of the detection element, and the ability to detect a fire or an abnormal rise in temperature at a location away from the detection element is usually reduced.

(2) A method of detecting temperature abnormalities by covering a pair of conductors with insulating material such as plastic that softens or melts at relatively low temperatures, and when the temperature rises, the insulating covering softens or melts and the two conductors come into contact. .

This method is advantageous due to location issues, but
L' -・Rokukofu,, n±, 4-mokuna B5-Toe J-ゝA7 It is said that there is a delay in learning, and that the plastic coating may creep over a long period of time, causing a pair of problems even if the temperature does not rise. Malfunctions due to contact between conductors are unavoidable. (3) Method using a thermal fuse (wood metal wire).

This method is advantageous in that it works reliably, but because it is a short product, it can only detect abnormal temperatures in a narrow space.Also, since it is not coated with insulation, the tip of the fused part is molten and falling objects can be exposed to electricity. Since it is physically active, there is a risk of causing secondary disasters such as damage or short circuits to the circuits located nearby below. The purpose of the present invention is to eliminate the drawbacks of the prior art described above, to quickly and accurately detect a temperature rise over a wide range, and to provide a novel method for detecting abnormal temperatures that does not cause secondary accidents due to short circuits. The purpose is to provide a detection line.

The gist of the present invention is to provide a conductor made of a low-melting point metal, and a flame-retardant plastic insulation coated on the circumference of the conductor, which turns into a sticky molten substance in the melting point region of the conductor. This is an abnormal temperature detection wire consisting of a conductor made of the low melting point metal that melts and breaks, and detects an abnormal temperature rise when the conductor of the low melting point metal melts and breaks. It becomes covered with a sticky molten material.

Here, the low melting point metal conductor is generally a metal or alloy wire with a melting point lower than that of tin, and is typically a wire made of two or more low melting point metals such as bismuth, lead, tin, cadmium, and indium. Refers to something made of an alloy. Base polymers for flame-retardant plastic insulators that transform into a sticky melt in the melting point region of low-melting metal conductors include ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate, and ethylene ionomer. etc. apply.

In addition, halogen compounds are mainly used as flame retardants, and antimony trioxide is mainly used as a flame retardant aid. Needless to say, the flame retardance of an insulator is a necessary property in order for it to transform into a molten material without burning out. As the low melting point metal conductor that melts due to abnormal temperature rise, alloys with various melting points can be used depending on the temperature to be detected.

Next, an example of its composition will be shown. one
．． 1Sj)--
- - - 'An example of the composition of a flame-retardant plastic insulator that turns into a sticky molten material is shown below.

Next, one embodiment of the abnormal temperature detection wire of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, 1 is the melting point 94 of the composition example (3) described above.
℃ low melting point metal conductor (diameter 1.0Tfrfft), 2
is the flame-retardant plastic insulator (thickness/
0.3Twt) was extrusion coated on the circumference of 1.

Table 1 shows the electrical characteristics of the abnormal temperature detection line of this example. *: Breakdown voltage value of the part covered with sticky molten material at the tip of the fused conductor.

In other words, as shown in FIG. 2, in the detection wire of this embodiment, the conductor 211 is not exposed from the flame-retardant plastic insulator 212 at the fusing part, as shown in A, but as shown at the mouth. , the conductor 213 is coated with a sticky melt 2140 (flame-retardant plastic insulator 214
molten material) to maintain a predetermined breakdown voltage.

As is clear from the above description, the abnormal temperature detection wire of the present invention can quickly and accurately detect abnormal temperature increases over a wide spatial range without malfunction, and also has excellent insulation properties at the tip of the fused wire. It is sufficient to prevent secondary accidents such as short circuits, and has the effect of exhibiting extremely excellent functionality even during long-term use.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the abnormal temperature detection wire of the present invention, and FIG. 2A and FIG. 1: Low melting point metal conductor, 2: Flame retardant plastic insulator, 2140: Adhesive molten material.

Claims (1)

[Claims] 1. On the circumference of the conductor made of a low-melting point metal, there is a flame-retardant plastic insulator that turns into a molten substance that becomes sticky to the conductor in the melting point region of the conductor and prevents the conductor from being exposed at the melting point. An abnormal temperature detection line characterized by being provided.