JPS6311467Y2 - - Google Patents

Description

[Detailed description of the invention] This invention can ensure safety in use by automatically shutting off the gas supply to the pilot burner and main burner when the pilot burner is ignited incorrectly or the pilot flame is unexpectedly blown out. With open combustion appliances such as gas water heaters,
Specifically, it consists of a thermoelectromotive member that generates electricity due to the combustion flame of the pilot burner, and an electromagnetic valve that automatically shuts off the fuel supply to the pilot burner and the main burner when the electromotive force generated by this decreases or disappears. This invention relates to an open combustion appliance equipped with a combustion safety circuit.

When using such open combustion appliances, sufficient precautions should be taken to prevent accidents (oxygen deficiency accidents) caused by carbon dioxide and carbon monoxide generated during combustion, especially when used continuously for a long period of time. However, in practice, it is difficult to enforce such ventilation, and long-term continuous use has led to accidents due to lack of oxygen.

In view of this situation, the present invention aims to prevent oxygen deficiency accidents caused by long-term continuous use without ventilation.
The purpose is to ensure reliable and effective prevention.

The open type combustion appliance according to the present invention is provided with a thermoelectric generating element that is heated by the combustion flame of the main burner, and is provided with a cutoff circuit that cuts off the solenoid valve by applying a reverse current to the solenoid valve, and , further comprising a charging/discharging circuit that charges the electromotive force generated by the thermoelectric generating element and discharges the charging current to the cutoff circuit as the reverse current when the charging capacity reaches a certain value or more. do.

According to the characteristic configuration of the present invention, when the main burner combustion time reaches a certain time, the fuel supply to the main burner and pilot burner is automatically cut off, based on the size of the room, the combustion capacity of the main burner, etc. By setting the above-mentioned combustion time, even if ventilation is not performed during continuous use for a long period of time, fuel can be supplied to the main burner and pilot burner before oxygen deficiency occurs. Oxygen deficiency accidents can be prevented by cutting off the supply, that is, combustion. Moreover, the charging/discharging circuit is charged with the electromotive force of the member that generates electricity when heated by the combustion flame of the main burner, and the combustion time of the main burner is measured. Compared to the case where it is activated, etc.
The actual combustion time of the main burner can be measured reliably.

Furthermore, by applying a back electromotive force to the thermoelectromotive member of the combustion safety circuit, the solenoid valve, which is originally provided to maintain safety against blowouts, automatically closes, thereby controlling both burners. Since the fuel supply is cut off, a safety device against oxygen deficiency can be configured with a simpler structure and at a lower cost than, for example, when a special cutoff valve is separately provided. Furthermore, as a member that generates electricity when heated by the combustion flame of the main burner, a thermoelectric element is used, which generates an electromotive force of 0.3V, which is nearly 10 times as much as a thermocouple. It is possible to generate a large amount of power while using only a small number of thermoelectric power generation elements, which is advantageous in terms of space and functionality. The actual combustion time measurement function by the charge/discharge circuit and the fuel supply automatic cutoff function by the cutoff circuit can be reliably carried out using economical means without causing any problems, and the desired safety effect against oxygen deficiency can be ensured. I've reached it.

Hereinafter, embodiments of the present invention will be described based on the drawings.

A thermocouple 2 (an example of a thermoelectromotive member) generates electricity when heated by the combustion flame of the pilot burner 1, and when the thermoelectromotive force generated by this decreases, the fuel gas supply to the pilot burner 1 and the main burner 3 is stopped. This is an open water heater equipped with a combustion safety circuit 5 consisting of a solenoid valve 4 that automatically shuts off, and is equipped with a timed safety device.

The timed safety device includes a thermoelectric generating element 6 that generates electricity when heated by the combustion flame of the main burner 3, and a solenoid valve 4 of the combustion safety circuit 5 that has a current generated in the opposite direction to the electromotive current of the thermocouple 2. A cutoff circuit 11 is provided to cut off the electromagnetic valve 4 by applying a current (reverse current), and the electromotive force generated by the thermoelectric generating element 6 is charged, and when the charging capacity exceeds a certain value, A charging/discharging circuit 10 is provided to discharge the charging current to the cutoff circuit 11 as the reverse current.

The charging/discharging circuit is connected to the thermoelectric generating element 6 via a variable resistor 7, and charges the electromotive force of the thermoelectric generating element 6 when the thermoelectric generating element 6 is in a heated electromotive state, In addition, when the thermoelectric generating element 6 is in a non-heating, non-electromotive state, a capacitor 8 discharges its charge through the thermoelectric generating element 6, and when the charging capacity of this capacitor 8 exceeds a certain value,
The Zener diode 9 breaks down and operates to conduct current to the transistor 13, and the Zener diode 9 is energized by the conduction operation of the transistor 13 and its contact 12a is activated.
and a relay 12 for closing the contact 1.
When 2a is closed, charging current is discharged to the cutoff circuit 11.

The specific numerical values of the thermoelectric generating element 6, capacitor 8, Zener diode 13, and relay 12 are as follows.
The electromotive voltage of the thermoelectric element 6 is 0.3V,
10 are connected in series so that the electromotive voltage is 3.0V. Capacitor 8 has a capacity of 10F, Zener diode 9 breaks down at 2V, and relay 12 operates at 1.5V.

14 is an on-off valve for the main burner 3.

According to the configuration of the above embodiment, the time required for the charging capacity of the charging/discharging circuit 10 to reach a constant value (required charging time) is determined by the capacitance of the capacitor 8 and the resistance value of the variable resistor 7. By changing the resistance value of 7, it can be adjusted as appropriate. In addition, during continuous use, the above-mentioned required charging time is the continuous use time. On the other hand, during general repeated use, each time the main burner 3 is extinguished, the charged charge is discharged through the thermoelectric generating element 6 during the time when the main burner 3 is extinguished, and the discharge capacity is reduced. Therefore, the charging capacity of the charging/discharging circuit 10 becomes the value obtained by subtracting the sum of the discharge amount via the thermoelectric generating element 6 during each non-use time from the sum of the charge amount during each use time, and the required charging time is the same as each use time. However, this extension of the charging time, that is, the extension of the time until the solenoid valve 4 is shut off, is due to the decrease in the oxygen concentration of the indoor air due to use (combustion). This is because the battery recovers through natural ventilation through gaps in windows and doors, and there is no risk of an oxygen deficiency accident occurring due to the extended charging time during repeated use.

The thermoelectric member 2 may be a thermoelectric generating element.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of the present invention. 1... Pilot burner, 2... Thermoelectric member,
3... Main burner, 4... Solenoid valve, 5... Combustion safety circuit, 6... Thermoelectric power generation element, 10... Charge/discharge circuit, 11... Cutoff circuit.

Claims (1)

[Scope of utility model registration request] Consisting of a thermoelectromotive member 2 that generates electricity by the combustion flame of the pilot burner 1, and a solenoid valve 4 that automatically shuts off the fuel supply to the pilot burner 1 and the main burner 3 when the electromotive force generated by this decreases or disappears. In an open type combustion appliance equipped with a combustion safety circuit 5, a thermoelectric generator 6 heated by the combustion flame of the main burner 3 is provided, and a reverse current is applied to the solenoid valve 4 to prevent the electromagnetic valve 4 from being heated. A cutoff circuit 11 is provided to cut off the
and charging the electromotive force generated by the thermoelectric generating element 6;
An open type combustion appliance characterized by being provided with a charging/discharging circuit 10 that discharges the charging current to the cutoff circuit 11 as the reverse current when the charging capacity reaches a certain value or more.