JPH0427447B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention mainly relates to an ignition alarm device for a grill burner of a gas stove.

(Prior art) A conventional device of this type uses a thermocouple that is heated by a burner to generate a thermoelectromotive force and a dry battery as a power source, and inputs the thermoelectromotive force from the thermocouple to notify the ignition of the burner. It is known that the device is equipped with a notifying means. (For example, see Japanese Patent Application Laid-Open No. 63-233209).

(Problem to be Solved by the Invention) However, the above conventional method uses the voltage of the dry battery as it is, and according to this, when the voltage of the dry battery gradually decreases with use, the burner ignites. Since the time required for notification by the later notification means changes, for example, the solenoid valve that controls the gas supply is held open by the thermoelectromotive force of the thermoelectric element, and the solenoid valve is still held by suction. If the pressure on the solenoid valve is released depending on the notification even though sufficient electromotive force has not been generated, the solenoid valve may close.

(Means for Solving the Problems) The present invention aims to provide a device which eliminates the above-mentioned disadvantages, and which uses a thermoelectric element that is heated by a burner to generate a thermoelectromotive force and a dry battery as a power source,
A determination circuit that inputs a thermoelectromotive force from the thermoelectric element to determine whether or not the burner is ignited; and a notification means that notifies the burner of ignition based on an ignition signal from the determination circuit, The present invention is characterized in that a constant voltage means is provided to keep the voltage from the dry battery supplied to the determination circuit constant.

(Function) The present invention has the above configuration. According to this, the voltage of the dry cell battery is supplied to the determination circuit in a constant state by the constant voltage element, so that the voltage of the dry cell battery gradually decreases as it is used. Even if the burner ignites, the reference value of the determination level remains unchanged, and therefore, the time from when the burner is ignited to when the notification is issued by the notification means does not change either.

(Example) Next, an example of the present invention will be described based on the drawings.

FIG. 1 shows an example of the circuit of the burner ignition alarm device of the present invention. This circuit consists of a dry battery 1 serving as a power source, and a regulator that keeps the voltage of the dry battery 1 constant and supplies it to a subsequent determination circuit 2. Constant voltage IC3 as voltage means
, a thermocouple 4 which is a thermoelectric element that generates a thermoelectromotive force by being heated by a grill burner of a gas stove (not shown), for example, which has a ceramic plate with a large number of flame holes, and a light emitting diode 5 which is a notification means. In this gas stove, the solenoid valve 19 that controls the gas supply to the grill burner is held open by the thermoelectromotive force of the thermocouple 4, and after the electromagnetic valve 19 is held open, the reference value of the judgment level is set so that the light emitting diode 5 lights up. is set.

To explain the judgment circuit 2 in more detail, the judgment circuit 2 consists of a bridge circuit 6, a comparator 7, and a transistor 8 as a switching element.
It is a reference value for the voltage appearing at the voltage dividing point A of one voltage dividing circuit to which the thermocouple 4 of the bridge circuit 6 is connected and the judgment level appearing at the voltage dividing point B of the other voltage dividing circuit of the bridge circuit 6. The reference voltage and the comparator 7
The thermocouple 4 is ignited by the grill burner.
When the thermal electromotive force exceeds a reference value, a high level output is generated from the comparator 7, and the transistor 8 is made conductive.

When doing this, the voltage of dry battery 1 is determined by the constant voltage IC.
3 and this constant voltage is supplied to the judgment circuit 2, so even if the voltage of the dry battery 1 gradually decreases with use, the reference voltage appearing at the voltage division point B of the judgment circuit 2 will always remain constant. Therefore, the time until the grill burner ignites, a thermoelectromotive force is generated from the thermocouple 4, the transistor 8 becomes conductive, and the light emitting diode 5 lights up, indicating that the grill burner has ignited, is always constant. This prevents the light-emitting diode 5 from lighting up before the output that keeps the solenoid valve 19 open is produced, and the user stops the ignition operation after confirming that the light-emitting diode 5 is lit. When you do this, there is no inconvenience like the conventional method where the fire goes out.

Incidentally, the light emitting diode 5, which is the notification means in this embodiment, has its lead wires 9,
9, the connector 10 is attached to the tip of the gas stove body 11 shown in FIG. 3. As shown in FIGS. Upper hole 13a and large diameter lower hole 1
After inserting the connector 10 into the lower hole 13b of the pothole 13 from the front, the lead wires 9, 9 are inserted into the upper hole 13a from the lower hole 13b of the pothole 13 through the intermediate constriction 13c. , and pull the entire body backward to fit the holder 5a of the light emitting diode 5 into the upper hole 13a of the pothole 13.
Finally, the operation panel 14 is placed over the front frame 12 so that only the light emitting part of the light emitting diode 5 is exposed. In this way, connect the lower hole 13b to the connector 10.
The upper hole 13a is made large enough to allow the holder 5a of the light emitting diode 5 to pass therethrough, and the lead wires 9 can be moved through the constricted part 13c between the upper hole 13a and the lower hole 13b. Since the connector 10 is larger than the holder 5a of the light emitting diode 5 and is connected to the lead wires 9, 9 of the light emitting diode 5, it can be installed from the front of the front frame 12 of the gas stove. , since the diameter of the holder 5a is larger than the constriction part 13c, the holder 5a is inserted from the upper hole 13a to the lower hole 13b.
will not fall.

In the figure, 15 is the rear frame of the gas stove main body 11, 16
is a leg; 17 is a pin for fixing the leg 16;
18 indicates a decorative frame.

Further, in the above-described embodiment, the thermocouple 4 was used as the thermoelectric element, but a thermoelectric generating element may also be used.

Further, in the above-described embodiment, the light emitting diode 5 is used as the notification means, but a buzzer or the like may also be used.

(Effects of the Invention) According to the present invention, the voltage from the dry cell battery supplied to the determination circuit for determining whether or not the burner is ignited is kept constant by the constant voltage means.
The reference value of the judgment level of the judgment circuit is held constant even if the voltage of the dry battery gradually decreases with use, and therefore the time from when the burner is ignited until the notification is issued by the notification means remains unchanged, and the voltage of the dry cell remains constant. As the burner gradually decreases with use, the reference value of the judgment level of the judgment circuit changes, so it is possible to eliminate the disadvantage of the conventional method in which the time required to notify the notification by the notification means after ignition of the burner changes. have an effect.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an example of the implementation of the present invention, FIG. 2 is a perspective view illustrating the specific structure of a light emitting diode as the notification means, and FIG. 3 is a gas cylinder incorporating the light emitting diode shown in FIG. An exploded perspective view of the filter body;
4 to 6 are perspective views illustrating the procedure for assembling the light emitting diode shown in FIG. 2 into the gas stove main body shown in FIG. 3. 1... Dry battery, 2... Judgment circuit, 3... Constant voltage IC (constant voltage means), 4... Thermocouple (thermoelectric element), 5... Light emitting diode (notification means).

Claims (1)

[Claims] 1. A thermoelectric element that is heated by a burner and generates a thermoelectromotive force; a determination circuit that uses a dry battery as a power source and inputs the thermoelectromotive force from the thermoelectric element to determine whether or not the burner is ignited; ignition means for notifying the ignition of the burner by an ignition signal from a circuit, characterized in that a constant voltage means is provided for keeping the voltage from the dry battery supplied to the determination circuit constant. Notification device.