JPH094841A - Gas appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the instantaneous emission of the fuel gas when the voltage of a dry battery is dropped by setting the power supply voltage in the critical condition under which each part can be activated with the dropped voltage of the power supply of the dry battery so as to satisfy the inequalities of the critical operation voltage of an accessory device driving circuit > that of a magnet valve driving circuit > that of an igniter circuit. SOLUTION: A battery power supply 100 is electrically connected to a magnet valve driving circuit 101 to attract and hold a magnet type safety valve and a push solenoid driving circuit 102 to push open the gas valve through contacts of a hydrostatic switch 94 and a lever switch 144. The voltage of the battery power supply is applied to the power supply circuit of an igniter circuit 103 to provide the spark to an ignition rod 19. The critical load voltage (power supply voltage in operation) capable of operating each circuit is set so as to satisfy the inequalities of the critical operation voltage of the push solenoid driving circuit 102 > that of the magnet valve driving circuit 101 > that of the igniter circuit 103.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas appliance equipped with a dry battery power source, and more particularly to a gas appliance which is opened by a dry battery power source, discharges and ignites gas.

[0002]

2. Description of the Related Art Generally, a gas appliance equipped with a magnet type safety valve is equipped with an auxiliary device such as a push solenoid for forcibly pushing the magnet type safety valve to reset the valve opening. Further, the magnet type safety valve is forcibly held open by the power of the dry battery until the thermocouple for detecting the misfire exposed to the pilot flame generates a predetermined electromotive force.
A so-called quick start ignition method is adopted. Further, the electric power of the dry battery is used to continuously spark to ensure ignition of the fuel gas. Further, when the voltage of the dry battery drops, the light emitting diode or the like is turned on or off to notify the user of the dry battery replacement time.

However, if the dry battery is not replaced, even if the push solenoid is pushed to reset the magnet safety valve, the magnetic safety valve may not be held open due to the voltage drop. Also, the magnetic safety valve is pushed and opened momentarily,
The magnet type safety valve was closed immediately because it could not be held open, but fuel gas was released instantaneously. Even if the push solenoid is used to push the magnet type safety valve and the magnet type safety valve is kept open, the ignition may explode if the spark discharge interval of the igniter becomes longer due to the voltage drop. It was

[0004]

The gas appliance of the present invention solves the above-mentioned problems, and even if the dry cell voltage drops, there is no instantaneous release of fuel gas, and a safe water heater that does not ignite to overflow. The purpose is to provide.

[0005]

A gas appliance according to the present invention which solves the above-mentioned problems, includes a thermocouple for generating an electromotive force due to combustion heat, and a decrease in the electromotive force of the thermocouple at the time of abnormal combustion, whereby a gas flow is reduced. A magnetic safety valve that shuts off the path,
At the time of ignition until the electromotive force of the thermocouple rises, a magnet valve drive circuit that energizes the magnetic safety valve to hold the valve open, and an auxiliary device that pushes the magnetic safety valve to reset it to the open position. In a gas appliance including a drive circuit, an igniter circuit that ignites fuel gas by generating spark discharge, and a dry battery power source that supplies power to each of the circuits, in a limit time at which each part can operate due to a decrease in the dry battery power source. The gist is that the power supply voltage is set to have a relation of [operation limit voltage of auxiliary device drive circuit> operation limit voltage of magnet valve drive circuit> operation limit voltage of igniter circuit].

In the gas appliance of the present invention having the above-mentioned configuration, the power supply voltage at the time when each part can operate due to the decrease of the dry battery power source is [the operation limit voltage of the auxiliary device drive circuit> the operation limit voltage of the magnet valve drive circuit> the igniter circuit Operating limit voltage]. Therefore, when the auxiliary device drive circuit resets the magnetic safety valve to the open position, the igniter circuit generates a spark discharge and ignites the fuel gas reliably, and the magnet valve drive circuit securely opens the magnetic safety valve. Hold the valve to continue combustion. As a result, even if the voltage of the dry cell drops, as long as the magnet type safety valve is opened, it is ignited normally and burned. Further, when the voltage of the dry battery further decreases, the magnet type safety valve remains closed, so that the fuel gas is not released.

DETAILED DESCRIPTION OF THE INVENTION

In order to further clarify the structure and operation of the present invention described above, preferred embodiments of the gas appliance of the present invention will be described below with reference to FIGS. 1 to 3. The water passing through the heat exchanger 5 of the gas appliance A is heated by the burner 13. By pressing the push button 11, each lever of the lever device 14 is rotationally driven, the pilot type water shutoff valve 3 is opened via the lever, and the water in the water supply pipe 1 is passed through the temperature control valve to the heat exchanger 5 Let it pass through. On the other hand, the instrument plug 6 installed in the gas passage 2 is pushed open, the magnet type safety valve 21 is installed in the passage on the upstream side of the instrument plug 6, and the push solenoid 12 as an auxiliary device is provided in the passage 2. The push rod 121 of the solenoid 12
Are opposed to the gas valve 211 of the magnet type safety valve 21. When the solenoid 12 is energized (hereinafter simply referred to as actuation), the push rod 121 is moved forward, and the gas valve 211 of the magnet type safety valve 21 is pushed open. When the magnetic safety valve 21 is opened,
Gas is supplied from the gas passage 2 to the pilot burner 18 and the main burner 13.

In FIG. 2, a thermocouple 2 which is a heat sensitive element.
2 shows a thermocouple circuit including the magnet 212 of the magnet type safety valve 21 and the controller 10 for applying an exciting current to the magnet 212. A commercial battery power source 100 is installed in the controller 10, and the battery power source 100 includes the water pressure switch 94 and the lever switch 1.
The magnet valve drive circuit 101 for adsorbing and holding the magnet type safety valve 21 through the contact point of 44 and the gas valve 2
It is electrically connected to a push solenoid drive circuit 102 that pushes and opens 11. Reference numeral 103 denotes an igniter circuit for blowing a spark to the ignition rod 19. Similarly, the battery power supply 100 is applied to the power supply circuit, and a timer circuit 104 drives the magnet valve drive circuit 101 and push solenoid drive. The operation time of the circuit 102 and the igniter drive circuit 103 is controlled.

When the push button 11 is pushed, the lever switch 144 is driven by the lever to close its contact, and the forward movement of the hydraulic pressure responding device 9 closes the contact of the water pressure switch 94 to close the igniter circuit 103. Is activated to cause spark discharge from the ignition rod 19. At the same time, by applying an operating voltage to the push solenoid 12 for only a short time to flow an exciting current Ips, the push solenoid 12
Pushes the gas valve 211 by forcibly opening the magnetic safety valve 21 with the push rod 121. At the same time, the magnet 212 holds the gas valve 211 in the open state by applying the attraction holding voltage to the primary coil of the magnet 212 and flowing the exciting current Iq. Then, when combustion is started, the thermocouple 22 is heated, and the exciting current Img starts to flow to the secondary coil of the magnet 212 by the generated thermoelectromotive force. Exciting current I to the primary coil of the magnet 212
Although q decreases gradually, the magnet 21 due to combustion heat
Since the excitation current Img of the secondary coil of the No. 2 increases,
The magnet 212 holds the gas valve 211 as it is. When the combustion flame disappears, the exciting current Img due to the combustion heat decreases, the magnet 212 loses the valve opening holding force, and the gas valve 211 closes.

Here, when the voltage of the battery power supply 100 drops, the magnet valve drive circuit 101, the push solenoid drive circuit 102, and the igniter circuit 103.
Stipulates the operating limit of. When the battery power source 100 is exhausted,
When the voltage is reduced, the current value of the circuit is reduced, the function of each circuit is reduced, and the circuit eventually stops operating. (It should be noted that it is possible to provide or provide a load voltage detection circuit so that the operation of the entire gas appliance is stopped when the voltage of the battery power supply drops below a predetermined voltage, but this will increase the cost. Therefore, it is not taken into consideration.) Therefore, prioritize the function stoppage of each circuit due to the voltage drop, focusing on the safety point of view. In addition, the load voltage of the limit that each circuit can operate (power supply voltage at the time of operation)
In the magnet valve drive circuit 101, Eps (mi
n), Eps in the push solenoid drive circuit 102
(Min), in the igniter circuit 103, Eig (mi
n). When the push solenoid drive circuit 102 has the ability to open the gas valve 211, the igniter circuit 103 must spark for reliable ignition. Therefore, to satisfy this condition, Eig (m
In) <Eps (min). When the push solenoid drive circuit 102 has the ability to open the gas valve 211, the magnet valve drive circuit 1
01 must keep the gas valve 211 open to continue combustion. Therefore, Eq (min) <Eps (m
in). Also, when the magnet valve drive circuit 101 holds the gas valve 211 open, the spark by the igniter circuit 103 must be reliable. Therefore, Eig (min) <Eq (mi
n). From the above, these relationships are summarized and Eig (min) <Eq (min) <Eps (m
in). The setting method is such that the power supply voltage (load voltage) that can be operated is in the above order by limiting the current value to each circuit by electric resistance etc. or adjusting the load to be operated by each circuit or adjusting the operation efficiency. To be set.

As described above, when the battery voltage decreases, the push solenoid drive circuit 102 does not operate first, and then the magnet valve drive circuit 101 does not operate. Even in this case, the igniter circuit 10
The spark according to 3 is performed normally. Therefore, when the magnet valve drive circuit 101 does not operate, the gas valve 211 cannot be opened in the first place, and there is no possibility of raw gas outflow. Further, when the push solenoid drive circuit 102 opens the magnetic safety valve 21, the igniter circuit 103 operates reliably and sparks the gas flowing out from the burner 13, so that raw gas is released or explosive ignition occurs. It will not take place. Further, since the magnet valve drive circuit 101 also operates reliably and the magnet type safety valve 21 is held open, the magnet type safety valve 21 is not closed before the electromotive force of the thermocouple 22 rises, and combustion is continued. To do.

The embodiment of the present invention has been described above.
The present invention is not limited to these examples, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention. For example, in the embodiment of the present invention, the push solenoid is used as the drive device that pushes and opens the magnet type safety valve, but other valve opening methods using a dry battery power source may be adopted. Although the thermocouple 22 is inserted in the flame of the pilot burner 18, the thermocouple 22 may be inserted in the flame of the main burner 13.

[0013]

As described above in detail, according to the gas water heater of the present invention, even if the voltage of the battery power source is lowered, normal ignition is performed when the magnet type safety valve is opened. It is safe because no raw gas is released. Further, since the magnet is surely attracted, the valve is held open, and the combustion is continued. Therefore, once the ignition is completed, the valve is not closed and disappears, and the usability is improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gas appliance as one embodiment.

FIG. 2 is a schematic circuit diagram according to an embodiment of the present invention.

FIG. 3 is a voltage characteristic diagram of a magnet valve driving circuit according to an embodiment of the present invention.

[Explanation of symbols]

13 Main Burner 18 Pilot Burner 19 Ignition Rod 21 Magnet Lube 22 Thermocouple 101 Magnet Valve Drive Circuit 102 Auxiliary Device (Push Solenoid) Drive Circuit 103 Igniter Drive Circuit Eps (min) Power Supply Voltage at the Operation Limit of Auxiliary Device (Push Solenoid) Eq (min) Power supply voltage when the magnetic safety valve is operating limit Eig (min) Power supply voltage when the igniter is operating limit

Claims (1)

[Claims] 1. A thermocouple that generates an electromotive force due to combustion heat, a magnet type safety valve that shuts off a gas flow path by reducing the electromotive force of the thermocouple during abnormal combustion, and an electromotive force of the thermocouple. During ignition until it rises, a magnet valve drive circuit that energizes the magnetic safety valve to hold it open, an auxiliary device drive circuit that pushes the magnetic safety valve to reset it to the open position, and a spark discharge In a gas appliance equipped with an igniter circuit for generating and igniting fuel gas, and a dry battery power source for supplying power to each of the above circuits, a power supply voltage at a limit at which each part can operate due to a decrease in the dry battery power source is set as [auxiliary device Circuit operation limit voltage> magnet valve drive circuit operation limit voltage> igniter circuit operation limit voltage] Gas appliances.