JPS585227Y2 - Fire safety thermocouple - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fire-extinguishing safety thermoelectric lamp for gas stoves, gas ranges, etc.

This type of thermocouple can prevent ignition errors on gas stoves and gas ranges.
It has a function that stops the power supply and closes the electromagnetic gas cutoff valve when the appliance stopper is incompletely closed or the flame goes out.

The characteristics of the electromotive force generated by conventional thermocouples show that if the rise of the electromotive force after ignition is accelerated, the fall after extinguishing is delayed, and if the fall is accelerated, the rise is delayed. 40 minutes after the flame goes out.
The gas cutoff valve was designed to close after raw gas was emitted for nearly a second, which was inconvenient and caused anxiety to users.

The present invention was developed to improve the above disadvantages, including the rise and fall of the electromotive force characteristics.

To provide a thermocouple capable of closing a gas cutoff valve within 15 seconds after extinguishing a fire.

To explain this with reference to the illustrated embodiment, reference numeral 1 indicates a linear thermoelectric material for the negative electrode, such as constantan, and a cylindrical thermoelectric material for the positive electrode, such as heat-resistant chromium steel, is attached to one end of the linear thermoelectric material 1. 2 are inserted and welded 3, and one conductive wire 5 is connected to the cylindrical thermoelectric material 2 via a cylindrical thermal conductor 4 with good thermal conductivity, such as brass.

However, in the present invention, the linear thermoelectric material 1 is provided with a different type of positive electrode thermoelectric material 6, such as chromel, separated from the welding point 3 at one end of the linear thermoelectric material 1. were welded together 7, and the periphery of the welded part 7 between the wires was covered with the cylindrical good thermal conductor 4 with a gap, and the other conductive wire 8 was connected via the different kind of linear thermoelectric material 6. It is something.

'The outer peripheries of the second wire-shaped thermoelectric materials 1 and 6 are covered with an insulating material 9.

Since the present invention is constructed as described above, the electromotive force characteristics at the welding point 3 between the linear thermoelectric material 1 and the cylindrical thermoelectric material 2 are as shown in Fig. 2 after ignition, similar to the conventional thermocouple. It shows a sudden rise as shown by the line a, and also shows a gentle fall as shown by the line a in FIG. After ignition, the electromotive force characteristics at the welding point 7 with the welding point 7 are heated by the heat conduction of the linear thermoelectric material 1 and the cylindrical thermal conductor 4, and as shown in the line in Fig. 2, the electromotive force shows a gradual rise. As the flame goes out, as shown by the line in FIG. 3, it shows a very gradual fall that follows the heat dissipation of the cylindrical thermal conductor 4.

As shown in the figure, when the combination of thermoelectric materials is positive electrode - negative electrode - positive electrode, the electromotive force at these two welding points 3 and 7 exactly cancels out, and the resultant electromotive force characteristic is shown in the line in Fig. 2 after ignition. As shown by line C, an electromotive force close to that of line a is obtained, and after the fire is extinguished, an electromotive force that is close to the difference between line a and line S, as shown by line C in FIG. 3, is obtained.

From this, as shown in Fig. 3, in the case of a conventional thermocouple consisting of a linear thermoelectric material 1 and a cylindrical thermoelectric material 2, that is, a welding point 3, the gas cutoff required C40 seconds for the valve to close after extinguishing. However, according to the present invention, gas can be shut off within 15 seconds under the same conditions.

If the distance between the welding points 3 and 7 and the heat capacity of the cylindrical thermal conductor 4 are appropriately selected, not only can the electromotive force characteristics be adjusted over a wide range, but also the output Even better effects can be obtained by using a thermoelectric material with poor heat resistance and corrosion resistance but excellent heat resistance and corrosion resistance, and by using a thermoelectric material with poor heat resistance and corrosion resistance but high output for the other welding points 7.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a performance curve diagram after ignition, and FIG. 3 is a performance curve diagram after extinguishment. 1...Thermoelectric material, 2...Thermoelectric material, 3
...Welding point, 4...Good thermal conductor, 5...
... Conductive wire, 6 ... Thermoelectric material, 7 ...
...Welding point, 8... Conductive wire.

Claims (1)

[Scope of utility model registration request] It consists of a linear thermoelectric material 1 and a cylindrical thermoelectric material 2 which is inserted and welded to the two ends of the thermoelectric material 1, and one conductor is connected to the cylindrical thermoelectric material 2 through a cylindrical thermal conductor 4. At the same time as connecting the wire 5, a different type of linear thermoelectric material 6 is welded 7 to the linear thermoelectric material 1 at one end separated from the welding point 3, and a different type of linear thermoelectric material 6 is welded to the linear thermoelectric material 1. A fire extinguishing safety side thermoelectric lamp characterized in that the other conductive wire 8 is connected.