JPH0732405U - Safety device for heating cooker - Google Patents

Abstract

(57) [Abstract] [Purpose] When a bimetal type thermostat is used for the temperature sensor, the contact is turned off and the contact is turned on.
Allows reignition up to N. [Configuration] A temperature sensor 1 using a bimetal type thermostat and an electromagnetic safety valve MV for opening and closing a gas passage,
Detects the flame of the main burner 3 and turns on the electromagnetic safety valve MV.
In the safety device of the heating cooker that forms a closed circuit with the thermocouple TC that is turned off, the contact of the temperature sensor 1 is turned off
From ON to contact ON, it is possible to energize the electromagnetic safety valve MV from another power source A such as a thermocouple 5 heated by the pilot burner 4 for a fixed time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a safety device for a heating cooker such as a table stove.

[0002]

[Prior art]

 As a safety device to prevent so-called tempura fire etc. in a heating cooker such as a table hob, a temperature sensor detects the heating temperature of the cooked food at the bottom of the pan and when the temperature reaches a preset heating temperature, an electromagnetic It is already known that the safety valve is cut off and the gas supply to the burner is stopped to automatically extinguish the burner for safety.

However, in the safety device of the heating cooker using the bimetal type thermostat as the temperature sensor, since the differential of the contact OFF to ON of the temperature sensor is large, automatic extinguishing due to the contact OFF of the temperature sensor causes the temperature sensor to fail. It takes a considerable time to reach the reignitable state by turning on the contact point.

That is, in a temperature sensor using a bimetal type thermostat, the bimetal is normally deformed and turned off at 250 ° C. and the differential is 20 to 25 deg. Therefore, once turned off, the bimetal must be lowered to 225 ° C. to 230 ° C. Is restored and does not turn on. Therefore, it takes about 30 to 40 seconds to naturally cool from 250 ° C to 225 ° C. If a cold pot with cold water is placed on the temperature sensor, the temperature sensor will immediately cool, but it still takes 10 to 15 seconds to reach 225 ° C.

[0005]

[Problems to be solved by the device]

 Therefore, even if the ignition is operated immediately after the automatic fire extinguishing, the temperature sensor is still in the contact off state, so it will not ignite, and even if it is tried to be reused after the automatic fire extinguishing, it cannot be used immediately until it can be reused. It was necessary to spend a considerable time (at least 10 to 15 seconds), which was inconvenient to use.

In view of such a problem of the safety device using the bimetal type thermostat for the temperature sensor, the present invention enables re-ignition from automatic extinguishing by turning off the contact of the temperature sensor to turning on the contact. The purpose is to provide a safety device for a cooking device that is convenient for use.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the safety device of the heating cooker according to the present invention opens and closes the gas sensor and the temperature sensor 1 using a bimetal type thermostat that detects the heating temperature of the cooked food on the bottom surface 2 of the pan. A closed circuit is formed by the electromagnetic safety valve MV and the thermocouple TC that turns on and off the electromagnetic safety valve MV by detecting the flame of the main burner 3, and the temperature sensor 1 detects the preset heating temperature. At this time, in the safety device of the heating cooker in which the contact is opened and the electromagnetic safety valve MV is de-energized to automatically extinguish, the quick circuit B in which the electromagnetic safety valve MV is energized from another power source A for a predetermined time The main feature is that the quick circuit B enables re-ignition from the contact OFF to the contact ON of the temperature sensor 1.

As a device related to the specific device, another power source A of the quick circuit B is a thermocouple 5 which is heated by a pilot burner 4 for a fixed time, and a timer circuit T controls the power supply for a fixed time to energize. It is also characterized in that the dry battery 6 is used.

[0009]

[Action]

 The safety device of the cooking device of the present invention having the above-mentioned configuration uses a bimetal type thermostat for the temperature sensor 1, and changes from automatic extinguishing by the contact OF F of the temperature sensor 1 to re-ignition by turning on the contact. If the re-ignition operation is performed before reaching, the electromagnetic safety valve MV is energized for a certain period of time from another power source A using the thermocouple 5 or the dry battery 6, and the electromagnetic safety valve MV is held open. It can be done immediately without waiting for the contact of the sensor 1 to turn ON.

Further, after the electromagnetic safety valve MV is energized by another power source A for a certain period of time, the contact point of the temperature sensor 1 is already ON, so that the electromagnetic safety valve MV is heated by the flame of the main burner 3 It is kept open with TC.

[0011]

【Example】

 An embodiment of a safety device in a heating cooker according to the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 1 denotes a temperature sensor using a bimetal type thermostat, which has a structure in which its contact is turned on and off when the bimetal is deformed and restored at a preset temperature. A closed circuit is formed by an electromagnetic safety valve MV installed on the upstream side of the gas passage for opening and closing the gas passage, and a thermocouple TC for detecting the flame of the main burner 3 and turning the electromagnetic safety valve MV on and off. Then, the temperature sensor 1 contacts the bottom surface 2 of the pan, and the bottom surface 2 of the pan measures and measures the heating temperature of the food.

Therefore, when the heating temperature of the cooked food rises to the set heating temperature, the bimetal 7 of the temperature sensor 1 is deformed and its contact 8 is turned off, and the thermocouple TC energizes the electromagnetic safety valve MV. Then, the electromagnetic safety valve MV is closed and the gas passage is closed to stop the gas supply to the main burner 3 to automatically extinguish the main burner 3. Further, when the bimetal 7 of the temperature sensor 1 is restored due to a decrease in the heating temperature of the cooked food and the contact 8 thereof is turned on, a closed circuit is formed and the reignitable state is automatically restored.

For example, as shown in FIG. 4, the temperature sensor 1 includes a bimetal 7 provided on the inner surface of the upper end of a cover 10 attached and fixed to a support base 9 and a pin provided in the support base 9. A direction in which the base end side is fixed to one pin 12 of 11 and 12 and the front end side is a movable contact 8b which comes in contact with and separates from a fixed contact 8a provided in the other pin 11, and both contacts 8a and 8b are always separated ( The contact plate 13 having a restoring force biased upward (in the drawing) is provided so as to interlock with the push-up bar 14 fixed to the contact plate 13, and the bimetal 7 detects the set heating temperature and the upper part in the drawing is shown. When it is bent and deformed, the tip side of the contact plate 13 is raised by the restoring force via the push-up bar 14, and the movable contact 8b is separated from the fixed contact 8a to turn off the contact 8, and the bimetal 7 Lowers the cooking temperature When it is restored to the horizontal position as shown in the figure, the tip end side of the contact plate 13 is pushed down by the restoring force of the bimetal 7 against the restoring force through the push-up bar 14, and the movable contact 8b is pressed against the fixed contact 8a to make contact. It has a structure in which 8 is turned on.

The temperature sensor 1 having the above-described structure is fixed by being supported by a washer 17 inside the upper end of a protective cover 16 having a heat collecting plate 15 in contact with the bottom surface 2 of the pot, which is fixed to the protective cover. The lower end 16 of the fixed tube 16 is fitted to the upper end of the fixed tube 18 via a relay tube 19 so as to be vertically movable, and is biased upward by a spring 20 (see FIG. 3). Is located in the center of the main burner 3 (see Fig. 1). In FIG. 3, 21 is a stopper that regulates the upper limit position of the temperature sensor 1, and 22 is a lead wire.

The electromagnetic valve MV includes a thermocouple TC for detecting the flame of the main burner 3 and an electromagnet Mg connected via the temperature sensor 1, a safety valve 24 biased in a closing direction by a spring 23, and the safety valve. A safety valve 24 is pushed open against the spring 23 by a spindle 26 that is linked with an ignition lever or the like at the time of ignition, and at the same time, the integral suction plate 25 is pressed against the attraction surface 27 of the electromagnet Mg. When the main burner 3 is normally ignited, the electromotive force from the thermocouple TC heated by the flame of the main burner 3 is applied to the electromagnet Mg to hold the safety valve 24 in the adsorption open state to open the gas passage. In the event of abnormalities such as poor ignition, blowout, etc., the heating of the thermocouple TC by the flame of the main burner 3 is stopped, so the power supply to the electromagnet Mg is cut off and the safety valve 24 is automatically closed by the force of the spring 23. To close the gas passage It has a structure that ensures the same safety. Incidentally, 28 is an inlet of the gas passage.

A is a power source of a quick circuit B for turning on and off the electromagnetic safety valve MV by power other than the thermocouple TC. In the embodiment shown in FIG. 1, the contact OF F of the temperature sensor 1 is turned on. At the time of reignition, a thermocouple 5 that is heated by a dedicated pilot burner 4 for a certain period of time is provided, and the thermocouple 5 is connected to the electromagnet Mg of the electromagnetic safety valve MV, and the pilot burner 4 is ignited at the time of reignition. Then, the thermocouple 5 is heated, and the electromotive force thereof is applied to the electromagnet Mg of the electromagnetic safety valve MV for a certain period of time to keep the safety valve 24 open.

Further, in the embodiment shown in FIG. 2, during re-ignition from the contact OFF to the contact ON of the temperature sensor 1, the energization time is set in the timer circuit T including the charge / discharge circuit, the voltage dividing circuit and the comparator. The dry battery 6 is controlled to be energized for a fixed time, and when reignited, the dry battery current is supplied to the electromagnet Mg of the electromagnetic safety valve MV for a fixed time to keep the safety valve 24 open. The timer circuit T has a resistor R₁And condenser C₁Are connected in series, and the resistance R₁Diode D₁And a charging / discharging circuit in which two resistors are connected in parallel ₂ , R₃Voltage divider circuit with a capacitor C connected in series₁It is composed of a comparator that compares the charging voltage of the battery and the voltage at the voltage dividing point of the voltage dividing circuit.

In this embodiment, when the switch SW is turned on at the time of re-ignition, the capacitor C ₁ is started to be charged through the resistor R ₁ , and immediately after the charging is started, the voltage at the point A is higher than the voltage at the point B. Since it is high, the output of the comparator becomes L, the transistor Q ₁ is turned on, the electromagnet Mg is energized through the resistor R ₆ , and the safety valve 24 is held in the suction open state. When the capacitor C ₁ is charged and the voltage at the point B becomes higher than the voltage at the point A, the output of the comparator becomes H, the transistor Q ₁ is turned off, and the energization of the electromagnetic stone Mg through the resistor R ₆ is stopped. .

After the elapse of a certain time from the start of energization of the electromagnet Mg by the timer circuit T to the stop of energization, the bimetal 7 of the temperature sensor 1 has already been restored and turned on, and thereafter the main burner 3 The electromagnetic safety valve MV is continuously held open by the electromotive force of the thermocouple TC that detects the flame.

The energization time from the other power source A to the electromagnetic safety valve MV by the quick circuit B is set to the time (at least 10 seconds to 15 seconds) required from the deformation to the restoration of the bimetal 7 of the temperature sensor 1. Is.

Although the embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention. .

[0023]

[Effect of device]

 According to the safety device of the cooking device according to the present invention, in the case where the temperature sensor uses the bimetal type thermostat, from the automatic extinguishing by the contact OFF of the temperature sensor to the re-ignitable state by the contact ON. Since it is possible to re-ignite, it can be reused immediately after the automatic fire extinguishing even if the temperature sensor is still in the OFF state.For example, when cooking cooked food that requires continuous heating, which is not a safety issue. It is convenient.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a safety device for a heating cooker according to the present invention.

FIG. 2 is a circuit diagram of a different embodiment.

FIG. 3 is a partially cut front view showing the entire temperature sensor component.

FIG. 4 is a cross-sectional view of only its main part.

[Explanation of symbols]

 1 Temperature sensor 2 Bottom of pan MV Electromagnetic safety valve 3 Main burner TC Thermocouple A Power supply B Quick circuit 4 Pilot burner 5 Thermocouple T Timer circuit 6 Dry battery

Claims (3)

[Scope of utility model registration request] 1. A temperature sensor (1) using a bimetal type thermostat for detecting a heating temperature of a cooked food on a bottom surface (2) of the pan, and an electromagnetic safety valve (MV) for opening and closing a gas passage.
And the flame of the main burner (3) is detected to detect the electromagnetic safety valve (M
V) turns on / off a thermocouple (TC) to form a closed circuit, and when the temperature sensor (1) detects a preset heating temperature, its contact opens and the electromagnetic safety valve (MV)
In a safety device of a heating cooker for automatically extinguishing electricity by shutting off electricity to the electromagnetic safety valve (MV), a quick circuit (B) is energized from another power source (A) for a predetermined time, and the quick circuit is provided. A safety device for a heating cooker characterized in that the circuit (B) enables re-ignition from the contact OFF to the contact ON of the temperature sensor (1). 2. The safety device for a heating cooker according to claim 1, wherein another power source (A) is a quick circuit (B) which is a thermocouple (5) heated by a pilot burner (4) for a certain period of time. 3. The safety of the heating cooker according to claim 1, wherein the power source (A) is a quick circuit (B) which is a dry battery (6) which is energized by controlling the timer circuit (T) for a certain period of time. apparatus.