JPH0744784A - High temperature warning device - Google Patents

Abstract

PURPOSE:To surely supply power to a warning output circuit by using a thermo- element which generates the voltage according to the temperature difference between the high temperature end to be heated and the low temperature end outputting a signal as a temperature sensor. CONSTITUTION:A thermo-element 1 comprising the high temperature warning device is a laminated thermo-element laminated with the p-type thermo- semiconductor layer and the n-type thermo-semiconductor layer to generate the prescribed voltage between a plus terminal 1c and a minus terminal 1d by the temperature difference between the high temperature end 1a to be heated and a low temperature end 1b outputting a signal. A liquid crystal display circuit 2 which is driven by the prescribed voltage, piezo-electric buzzer 3, and a LED 4 which is turned on by the prescribed voltage are connected to both terminals 1c and 1d. When the liquid crystal display circuit 2 is driven, the present time and temperature are displayed on a display part. The piezo-electric buzzer 3 is provided with a driving IC. In short, the thermo-element 1 is used as the driving power supply, the power can be supplied to the warning output circuit regardless of the power failure and the battery shortage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high temperature alarm device used for fire alarm devices and the like.

[0002]

2. Description of the Related Art Buildings, factories, and the like are equipped with a high-temperature alarm device for issuing an alarm such as a sound to notify an abnormally high temperature such as a fire. The high temperature alarm device is composed of a temperature sensor that detects the temperature, an alarm output circuit that outputs an alarm such as a sound based on information from the temperature sensor, and a drive power supply for normally operating the alarm output circuit. There are things that have been done.

[0003]

The above-mentioned conventional high temperature alarm device requires a drive power supply for the alarm output circuit, and therefore the drive power supply fails to supply power to the alarm output circuit due to a power failure due to a fire or the like. There is a problem that the alarm output circuit cannot issue an alarm. Further, even if the driving power source of the high temperature alarm device is a battery, the problem described above occurs due to the dead battery.

In view of the above circumstances, it is an object of the present invention to provide a high temperature alarm device capable of reliably supplying electric power to an alarm output circuit.

[0005]

A high temperature alarm device of the present invention for achieving the above object comprises a temperature sensor for detecting a temperature and an alarm output circuit for outputting an alarm based on information from the temperature sensor. In a high temperature alarm device provided with, as the temperature sensor, a thermoelectric element for generating a voltage according to a temperature difference between a high temperature end to be heated and a low temperature end to which a signal is output is provided, and this thermoelectric element is provided in the alarm output circuit. It is characterized by being used as a driving power supply.

[0006]

The high temperature alarm device of the present invention is used as a temperature sensor.
It is equipped with a thermoelectric element that generates a voltage according to the temperature difference between the high temperature end where it is heated and the low temperature end where a signal is output.Since this thermoelectric device is used as the drive power supply for the alarm output circuit, another power supply Electric power can be reliably supplied to the alarm output circuit without need.

[0007]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a schematic view showing an embodiment of the high temperature alarm device of the present invention. The thermoelectric element 1 constituting this high temperature alarm device is a laminated thermoelectric element in which a p-type thermoelectric semiconductor layer and an n-type thermoelectric semiconductor layer are laminated. This thermoelectric element 1 has a high temperature end 1 to be heated.
A voltage of 1.5 V is generated between the plus terminal 1c and the minus terminal 1d at a temperature difference of 600 ° C. between the a and the low temperature end 1b where the signal is output. 1.2V is applied to these terminals 1c and 1d.
The liquid crystal display circuit 2 driven by the voltage of 1, the piezoelectric buzzer 3 also driven by the voltage of 1.2V, and the LED 4 that lights up by the voltage of 1.6V are connected. When the liquid crystal display circuit 2 is driven, the current time and temperature are displayed on the display section. The piezoelectric buzzer 3 is provided with a driving IC.

When the high temperature end 1a of the thermoelectric element 1 is heated by the gas burner 5 and the temperature of the high temperature end 1a becomes 600 ° C. or higher, the piezoelectric buzzer 3 is driven and an alarm sound is emitted from the buzzer. Next, the liquid crystal display circuit 2 was driven and the current time and temperature were displayed on the display section. When heating was continued and the temperature of the high temperature end 1a reached 750 ° C. or higher, the LED 4 was turned on. When the high temperature end 1a was continuously heated for 15 minutes while the LED 4 was turned on, the piezoelectric buzzer 3 and the liquid crystal display circuit 2 were also continuously driven. After this, heating is terminated and the high temperature end 1
When the temperature of “a” gradually decreases, the LED 4 is turned off first,
Then, the display portion of the liquid crystal display circuit 2 erased the display, and the piezoelectric buzzer 3 stopped.

[0009]

As described above, since the high temperature alarm device of the present invention uses the thermoelectric element as the driving power source of the alarm output circuit, the alarm output circuit is powered regardless of power failure or battery exhaustion. Can be reliably supplied.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a high temperature alarm device of the present invention.

[Explanation of symbols]

 1 Thermoelectric Element 1a High Temperature Edge 1b Low Temperature Edge 2 Liquid Crystal Display Circuit 3 Piezoelectric Buzzer 4 LED

Claims (1)

[Claims] 1. A high temperature alarm device comprising a temperature sensor for detecting temperature and an alarm output circuit for outputting an alarm based on information from the temperature sensor, wherein the temperature sensor is a high temperature end to be heated and a signal. Is provided with a thermoelectric element that generates a voltage according to the temperature difference from the low temperature end, and the thermoelectric element serves as a drive power source for the alarm output circuit.