JP2800393B2 - Water heater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition performance of a gas instantaneous water heater or the like.

2. Description of the Related Art Conventionally, as shown in FIG. 3, a gas instantaneous water heater of this type opens a gas solenoid valve 2 provided in a gas passage 11 by pressing an operation switch 1, and a combustion detecting element such as a thermocouple. As a result, the gas solenoid valve 2 is automatically closed when the combustion flame blows out or lacks oxygen. At the same time, when the switch 1 is pressed, the water on / off valve 6 provided in the water passage 12 is opened, and a water pressure responsive gas valve 8 is provided downstream of the solenoid valve 2 in the gas passage 11 which is opened by the water governor 7 that has detected the water pressure. Was. Further, when the operation switch 1 is pressed, the igniter 3 is operated by the continuous discharge of high voltage, the burner 10 is ignited and burned, and the water flowing through the heat exchanger 9 is heated to make hot water. These required powers are supplied by a battery power supply (not shown) using a dry battery or the like having a small charge capacity or a small supply voltage.

However, in the configuration of the gas instantaneous water heater, when the operation switch 1 is turned on, the water on-off valve 6 and the gas solenoid valve 2 open almost simultaneously, and further open by the water flow and water pressure. The water pressure responsive gas valve 8 provided in the gas passage 11 is opened, and water and fuel flow out, and fuel is supplied to the burner 10. At the same time, the igniter 3 is discharged. Immediately after the operation switch 1 is turned on, when the gas solenoid valve 2 is opened, the discharge voltage of the igniter 3 drops during the timing A shown in FIG. 4 because the capacity of the power supply is small. in the meantime,
The continuous discharge cycle of the igniter 3 significantly decreases or stops. During this time, despite the fuel gas being supplied from the burner 10, the igniter 3 does not continuously discharge at a normal cycle, so that a combustion flame cannot be formed, and the unburned gas is released from the burner 10. You.

Thereafter, the opening operation of the gas solenoid valve 2 ends, and the ignition device 3
When the voltage drop disappears (after the timing A), the igniter 3 has a problem that the igniter 3 starts to discharge continuously normally, ignites the unburned gas discharged from the burner 10 due to poor ignition, and ignites explosively. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to improve ignition performance and form a combustion flame promptly by a smooth ignition operation.

Means for Solving the Problems In order to achieve the above object, the means for solving the problems of the present invention has a timer control circuit that opens the water on-off valve after the end of the voltage drop accompanying the opening operation of the gas solenoid valve. It was done.

The operation of the present invention by means of the above means, while the igniter voltage is falling due to the opening operation of the gas solenoid valve after the operation switch is turned on, the water open / close valve closes, the water pressure responsive gas valve also closes, After a predetermined time delay by the timer control circuit, the gas starts to flow after normal discharge of the igniter is enabled, and smooth ignition is performed to form a combustion flame.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a water heater according to the present invention. A gas passage 11 is provided with a gas solenoid valve 2 opened by an operation switch 1 and a burner 10 via a water pressure responsive gas valve 8. Water passage 12
A motor 5 for driving which operates by delaying the signal of the operation switch 1 by a timer circuit 4;
A water on-off valve 6 which is opened by water, a water governor 7 which controls the amount of water and opens the hydraulically responsive gas valve 8,
A heat exchanger 9 for heating water with 10 is provided. Further, an igniter 10 for igniting the burner 10 by the operation switch 1 is provided.

AC that drives gas solenoid valve 2 etc. and is distributed to the home
A controller S which does not use a 100V power supply, uses a battery power supply 13 having a small charging capacity and a small supply voltage for economical purposes, and includes a timer circuit 4 and the like indicated by a dashed line in FIG.

Next, the operation of the above configuration will be described with reference to the ignition operation time chart of FIG.

First, when the operation switch 1 is turned on, the gas solenoid valve 2 opens,
At the same time, the igniter 3 is operated to continuously discharge, and the timer circuit 4 starts to operate. During timing A of 0.5 to 1 second when the gas solenoid valve 2 is performing the opening operation, a large current flows through the gas solenoid valve 2, the voltage of the igniter 3 decreases, and the continuous discharge cycle decreases. During this time, the timer circuit 4 operates, and after 1 to 1.2 seconds B timing after the end of the opening operation of the gas solenoid valve 2, the timer circuit 4 is turned off, the motor 4 starts to operate, the water on-off valve 6 opens, and water flows out. Since the motor 4 performs a gentle rotational movement and a large current does not flow as in the opening operation of the gas solenoid valve 2, the continuous discharge cycle of the igniter 3 does not decrease. Simultaneously with the flow of water through the water governor 7, the water pressure responsive gas valve 8 is opened to supply gas to the burner 10, and a high-voltage continuous discharge generated by the igniter 3 forms a combustion flame to perform smooth ignition.

Note that, as an example, the discharge of the igniter 3 may be started by a signal from the water governor 7 or the like after the gas solenoid valve 2 is opened.

Effect of the Invention As described above, after the gas solenoid valve opening operation is completed by the timer control circuit, the water open / close valve is opened, the water pressure responsive gas valve is opened, gas is supplied to the burner, and combustion is performed by normal discharge of the igniter. A highly safe water heater can be provided without the risk of explosive ignition due to rapid formation of flame.

[Brief description of the drawings]

FIG. 1 is a block diagram of a water heater showing one embodiment of the present invention, and FIG.
The figure shows the ignition operation time chart, FIG. 3 shows the configuration of a conventional water heater, and FIG. 4 shows the ignition operation time chart. DESCRIPTION OF SYMBOLS 1 ... Operation switch 2 ... Gas solenoid valve 3 ... Ignition device 4 ... Timer circuit 6 ... Water on / off valve 7 ... Water governor 8 ... Water pressure responsive gas valve 13 ... Battery Power supply.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-217114 (JP, A) JP-A-2-28956 (JP, U) JP-A-61-186961 (JP, U) (58) Investigation Field (Int.Cl. ⁶ , DB name) F23N 5/20

Claims (1)

(57) [Claims] 1. A water opening / closing valve provided in a water passage, a water pressure responsive gas valve for opening a gas passage in response to a signal from a water governor, and an operation switch provided in the gas passage upstream of the water pressure responsive gas valve. A gas solenoid valve, an igniter for forming a combustion flame in a burner connected to the gas passage, a timer circuit for opening the water on-off valve after the gas solenoid valve is opened, and a small supply voltage and small charging capacity. Water heater with battery power supply.