JPS62228814A - Combustion safety device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of explosion ignition, by a method wherein, when the terminal voltage of the battery source of an ignitor is decreased to a value lower than a given value, an electromagnetic safety valve situated in a gas feed passage is closed. CONSTITUTION:When the terminal voltage of a battery source 20 exceeds a given value by, for example, 0.8V, the spark frequency of an ignitor 15 exceeds, for example, 1Hz at which there is a fear of explosion ignition occurring, and the energizing current of an actuating solenoid 10 exceeds a holding current of, for example, 100mA. Thereby, an electromagnetic safety valve 19 is held in an opening state, and a main burner 3a, a pilot burner 3b, and an ignition burner 3c are normally ignited. When the terminal voltage of a battery source 20 is below 0.8V, the spark frequency of the ignitor 15 is decreased to 1Hz or less. Since an energizing current to the actuating solenoid 10 is controlled to 10mA or less by means of a valve closing means 23, for example, a series connection circuit of a diode 24 and a resistor 25, the electromagnetic safety valve 19 is closed and live gas is not delivered therefore the main burner 3b, the pilot burner 3b, and the ignition burner 3c are not ignited to ensure safety.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to gas water heaters and other combustors equipped with an igniter driven by a battery power source and an electromagnetic safety valve interposed in a gas supply path to a burner. Regarding combustion safety devices.

(Prior art) In a conventional device of this type, at the initial stage of ignition when the igniter is driven, the electromagnetic safety valve is kept open by the discharge current of the capacitor to continue supplying gas to the burner, and the burner is activated. After being ignited and heated by the flame to generate a certain electromotive force from the thermal lightning pair, the safety valve is held open and the gas to the burner is It is known that the burner continues to be supplied with the burner and continues to burn the burner.

(Problem to be solved by the invention) However, when the igniter is driven by a battery power source, the spark frequency is proportional to the terminal voltage of the battery power source, and if the terminal voltage is low, the spark frequency is low, and the burner is This is undesirable because there is a risk of explosion and ignition because the ignition occurs in the state where the mountain gas is released.

(Means for Solving the Problems) The present invention aims to provide a device that eliminates the above-mentioned disadvantages, and includes an igniter driven by a battery power source,
A combustor equipped with an electromagnetic safety valve interposed in a gas supply path to a burner, characterized in that a valve closing means is provided for closing the electromagnetic safety valve when the terminal voltage of the battery power supply becomes equal to or less than a predetermined value. shall be.

(Function) The present invention has the above configuration, and according to this, when the terminal voltage of the battery power source that is the power source of the igniter is below a predetermined value, in other words, when the spark frequency of the igniter is below a predetermined value, the valve is closed. By means of the means, the electromagnetic safety valve can be opened by lowering the current flowing through the Ti electromagnetic safety valve below the holding current, and the burner will not explode and ignite.

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

Fig. 1 shows an embodiment in which the present invention is applied to a gas water heater. and a burner unit (3) facing the burner unit (3), and an operating section (4) consisting of a push-button type push button on the front surface thereof.

According to the first bushing, the operating member (4) moves from the illustrated starting point, normal position WIIA, to its tangential end, ignition position B.
If the bushing is moved back to the ignition position and subsequently released, the bushing will be returned to the open position C located in the middle in front of it. When the bushing is released, it returns to the normal position.

The burner unit (3) includes a main burner (3a),
It consists of a constant burning burner (3b) on the side and an ignition burner (3C) on the side, and the gas supply path (5) connected to the unit (3) is connected to the above-mentioned operating member (4). According to the reversal to the ignition position ff1B, the gas valve (7) is opened by being pushed through the operating rod (6), and the gas valve (7)
When the valve is opened, an electromagnetic safety valve (9), which is an operated member that is pushed and opened via the intermediate lever (8), intervenes, and the safety valve (9) holds the valve. An operating solenoid (IG) is provided for the gas supply path (5), and the heat exchanger (IG) is located downstream of the gas supply path (5).
A water pressure responsive valve 03 that opens when water is flowing in response to the water governor (+21) in the water passage aD connected to the water passage aD is intervened.

Further, the burner unit (3) is provided with the operating solenoid (IO) and a thermocouple a@ connected to both ends of the operating solenoid (IO) on its upper surface, and is also provided with an igniter a9 which is an operated member for ignition.

Further, on the side of the operating member (4), when the operating member (4) is operated to the ignition position B, there is a hold switch ae which is pressed and switched by the operating rod (6) on the way. An ignition switch (+71) is provided which is pushed by the operating rod (ω) to close at the ignition position ffB.

Drawing aε shows a water valve interposed in the aforementioned water passage 0v, which valve [phase] is pushed so as to be heard when the operating member (4) returns from the ignition position B to the open position C. configured.

Figure 2 shows an embodiment of the control circuit. In this case, a capacitor a9 consisting of an electrolytic capacitor or an electric double layer capacitor is connected to the battery power source ■ side and the short circuit side by a hold switch 0e. The normally open side fixed contact (16a) of the hold switch (lG), the operating solenoid (one end of IO, one end of ignition ias+, and the positive pole of the battery power supply ■ are grounded, and the negative pole of the battery power supply ■ is connected to the relay Connect the fan to the negative pole of the capacitor (2) through (1) and resistor (2), and connect the other end of the igniter 09 to the other end of the solenoid (10) and the normally open contact (21a) of the relay (2). It was connected to the connection point between the battery power source (1) and the relay (2) via the capacitor (1!J), and an ignition switch (17) was connected in parallel to the capacitor (1!J).

In this case, the hold switch ae is switched to the normally open side with the backward movement of the operating member 0@ from the normal position 1fffA to the ignition position B, and then when the ignition switch (+71) is closed, at the ignition position B, The relay ■ is energized by the battery power source ■, its contact (21a) is switched, the operating solenoid 0o is energized, the electromagnetic safety valve (9) is kept open, and the igniter a9 is activated. so that sparks are generated on the main burner (3a), the constant fire burner (3b), and the ignition burner (3C), and when the operating member (4) is returned to the 1 m position from the ignition position B, the ignition switch is activated. (17) opens to start charging the capacitor CI9, and the charging current continues to energize the relay (2), keeping the electromagnetic safety valve a9 open, and the igniter (19) continues to be driven. Main burner (3
a) The spark was maintained on the constant burner (3b) and the ignition burner (3C).

Here, the present invention provides a valve-closing means for closing the electromagnetic safety valve (■) when the terminal voltage of the battery power source (■) falls below a predetermined value. It consists of a series connection circuit with a resistor (1), and this is inserted into the circuit connecting the other end of the operating solenoid (1) and the other end of the igniter (19).

When hiding, use the battery [! When the terminal voltage of υ exceeds a predetermined value, for example, 0.8V, the spark frequency of igniter a9 is set to a high level, such as H, where there is a risk of explosion and ignition.
z and the activation solenoid (IO communication ff1if
Since the flow exceeds the maintained flow, for example, 100-8, the 7B magnetic safety valve a9 is held open, and the main burner (3a), the constant burner (3b) and the ignition burner (3C
) is ignited normally.

Also, when the terminal voltage of the battery power supply υ is 0.8■ or less,
When the spark frequency of igniter a9 becomes 111Z or less, at this time, in the conventional type, the electromagnetic safety valve ■ is kept open, and the main burner (3a), ordinary burner (3b), and/or ignition burner (3c) explode. Although this is dangerous due to ignition, the present invention uses a diode and a resistor as the valve closing means.
Since the current flowing to the operating solenoid (+1) is regulated to 100 mA or less by the series connection circuit with the ) and ignition burner (3C
) is safe and will not catch fire.

In the illustrated embodiment, a part of the valve closing means (2) is constructed of a diode (phase) having a non-linear resistance characteristic, so that the electromagnetic safety valve (9) can be quickly placed in the proper position.

In the illustrated embodiment, the valve closing means is composed of a series connection circuit of the diode (■) and the resistor (■), but it is not limited to this. In the illustrated embodiment, the valve closing means (2) is inserted into the circuit that connects the tip of the operating solenoid (10) and the other end of the igniter 0!i1, but the invention is not limited to this. As long as it can perform the same function as this, it can be installed anywhere.

(Effects of the Invention) According to the present invention, when the terminal voltage of the battery power source which is the power source of the igniter becomes lower than a predetermined value, the valve closing means for closing the ffl magnetic safety valve interposed in the gas supply path is provided. Since this is provided, the supply of gas to the burner can be stopped when the spark frequency of the igniter falls below a predetermined value, which has the effect of eliminating the risk of explosion and ignition.

[Brief explanation of drawings]

FIG. 1 is a cutaway plan view of an example of a gas instantaneous water heater equipped with the device of the present invention, and FIG. 2 is a circuit diagram of the main parts thereof. 3a... Main burner (burner) 3b... Constant fire burner (burner) 3C... Ignition burner (burner) (5)... Gas supply path (9)... Electromagnetic safety valve (11)...・Operating solenoid (15+...Igniter■...Battery power supply■...Valve closing means

Claims (1)

[Claims] In a combustor equipped with an igniter driven by a battery power source and an electromagnetic safety valve interposed in a gas supply path to a burner,
A combustion safety device comprising a valve closing means for closing the electromagnetic safety valve when the terminal voltage of the battery power supply becomes equal to or lower than a predetermined value.