JPS6166023A - Electric stove - Google Patents

Abstract

PURPOSE:To prevent a fire hazard from occurring when a combustible matter draws near to the front part of a heating element by providing an electric circuit which turns off the heating element by a signal emitted from a temperature sensor for detecting the temperature rise of an object being heated by the heating element and further providing the temperature sensor at the upper part of a reflection plate. CONSTITUTION:A thermistor 5 is fixed as a temperature sensor on the surface of a stove casing 1 at the upper part of a reflection plate 2. When an obstacle 11 such as a combustible matter or the like approaches the front of a guard 4, the temperature of the obstacle 11 rises up by the heat of the heating element 3. The ambient temperature of the thermistor 5 rises up by the heat, and the resistance value varies, and the power supply to the heating unit is stopped by a control circuit 6. For this reason, the heating of the obstacle 11 is stopped and hence the generation of fire hazard can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fire prevention safety device for electric stoves.

Conventional Structure and Problems Conventionally, electric heaters have been fitted with guards to prevent people's hands, objects, etc. from easily touching the heat generating part.

However, if a flammable object is placed close to the front of the guard, the heat from the heating element will heat the combustible object and reach a high temperature, which may cause a fire to the nearby combustible object or even cause a house fire. Ta.

Hereinafter, the conventional electric stove as described above will be explained with reference to the drawings.

FIG. 1 shows a cross section of a conventional electric stove, and FIG. 2 shows its electric circuit diagram.

1 is a stove housing, 2 is a reflective plate that reflects heat forward, 3 is a heating element located in front of the reflective plate 2, and 5 is located on the back of the reflective plate 2, inside the stove housing 1. The thermostat senses the temperature rise inside the stove housing and turns off the power to the heating element 3.

The operation of the electric stove configured as above will be explained below.

When a combustible substance or the like falls on the upper part of the stove housing 1 and the temperature inside the housing rises abnormally, a thermostat 5 stops the power supply to the heating element 3.

However, in the above configuration, the stove housing 1
The thermostat 5 will not operate unless the internal temperature rises, so if there is a flammable object in front of the stove, the temperature inside the casing will not rise and the thermostat 5 will not operate as a safety device to prevent fire. As such, it was not appropriate.

OBJECTS OF THE INVENTION In view of the above-mentioned problems, the present invention provides an electric stove that can prevent a fire when a combustible substance approaches the front of a heating element.

Structure of the Invention In order to achieve this object, the present invention includes a temperature sensor that detects a temperature rise of an object heated by a heating element, and an electric circuit that turns off the heating element based on a signal from the temperature sensor. The temperature sensor is provided above the reflecting plate.

With this configuration, when a combustible object comes close to the front of the heating element, the temperature sensor detects the heat from the combustible object that has reached a high temperature and turns off the heating element, thereby preventing a fire from occurring in the nearby combustible object. This can be prevented.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows an electric stove according to an embodiment of the present invention.
It shows a side cross section.

In FIG. 3, 1 is a stove casing with a front opening;
The stove includes a reflecting plate 2 facing the front, a heating element 3 located in front of the reflecting plate 2, and a guard 4 fixed to the front opening of the stove casing 1.

Above the reflector plate 2, a thermistor 5 is fixed to the surface of the stove housing 1 as a temperature sensor. It is provided at the bottom inside the housing 1.

The thermistor 5 is fixed to the bottom part 8 of the recess 7 of the stove face piece 1, and the tip of the thermistor 5 is attached to the stove housing 1.
It is fixed inward from the surface of the

In the figure, 9 is a main power switch for the heating element 3, and 10 is a leg that supports the stove casing 1.

Further, the thermistor 5 is located approximately at the focal point of the bottom surface 8 of the recess 7, making it easy to collect heat from the front.

The operation of the electric stove configured as above will be explained below.

First, there is no obstacle in front of the guard 4, so it cannot normally be used, and the heating element 3 is energized.

As shown in Figure 4, there is an obstacle 1 such as flammable material in front of the guard 4.
1 approaches, the temperature of the obstacle 11 rises due to the heat of the heat generating element 3, the ambient temperature of the heat source 4L star 5 rises due to the heat, the resistance value increases, and the control circuit 6 causes the heat generating element to Power to 3 is stopped.

Therefore, the obstacle 11 stops heating and can prevent ignition.

In addition, if the combustible material 12 falls on the top surface of the stove housing 1 as shown in FIG.
1 /l'l l-Kan V 3 Kurarisente? Prevents temperature rise and prevents ignition.

Also, in the case of a fall as shown in FIG. 6, the floor surface 13 is kept warm and the floor surface 13 is
prevent ignition.

Furthermore, since the thermistor 5 is provided inward from the surface of the stove housing 1, it is less susceptible to the effects of convection heat from the heating element 3 during normal use.

Furthermore, since the thermistor 5 is provided approximately at the focal point of the bottom 8 of the recess 7, it is easy to collect heat from the obstacle 11, and the temperature of the thermistor 5 rises quickly.

As described above, according to this embodiment, by providing the thermistor 5 above the reflector 2 and on the surface of the stove housing 1,
When an obstacle 11 approaches in front of the guard 4, a rise in the temperature of the obstacle 11 is detected and the electricity to the heating element 3 is stopped,
It is possible to prevent the obstruction 11 from catching fire.

Also, if flammable material falls above the stove body 1,
When the ambient temperature of the thermistor 5 rises, the power supply to the heating element 3 is stopped. Furthermore, even in the event of a fall, the thermistor 5 senses the rise in temperature of the floor surface and stops power supply to the heating element 3 to prevent ignition.

Furthermore, since the thermistor 5 is located inward from the stove surface, it is less affected by convection heat during normal use, so the temperature remains low and stable.

Further, since the thermistor 5 is located approximately at the focal point of the bottom shape of the recess, it is easy to collect the heat of the object, the temperature rises quickly, and the heating element 3 can be turned off before the object ignites.

Effects of the Invention As described above, the present invention provides a temperature sensor above the reflector plate that detects the temperature rise of the object heated by the heating element. (1) Temperature of the object near the front of the guard By detecting the rise and stopping the electricity to the heating element, it is possible to prevent the object from catching fire.

(2) Even if a combustible object such as a towel falls on the top of the stove, the rise in temperature around the temperature sensor will stop the power supply to the heating element and prevent ignition.

(3) Even if the stove falls over, the temperature sensor detects the rise in temperature on the floor surface, preventing the heating element from igniting at 0FFL, so there is no need for an overturning switch.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional electric stove, Fig. 2 is its electric circuit diagram, Fig. 3 is a sectional view of an embodiment of the present invention, and Fig. 4 is a side view of the same embodiment in a state in which combustibles are in close proximity. , FIG. 5 is a side view with combustible material on the top surface, FIG. 6 is a side view of the device in an overturned state, and FIG. 7 is a circuit diagram. 1...Stove housing, 2...Reflector, 3...
... Heating element, 4 ... Guard, 5 ... Thermistor (temperature sensor), 6 ... Control circuit (electric circuit), 7 Recess, 8 ... Bottom. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4 Figure 7 Atz too Y

Claims (2)

[Claims] (1) A heating element placed in front of the reflector, a guard placed in front of the heating element, a temperature sensor that detects a temperature rise of an object heated by the heating element, and this temperature sensor. an electric circuit that turns off the heating element in response to a signal from the heater, and the temperature sensor is provided above the reflector plate. (2) The electric stove according to claim 1, wherein the temperature sensor is fixed to the bottom of the recess on the surface of the stove casing and is provided inward from the surface of the stove casing.