JP3072265B2 - Gas appliances - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas appliance provided with a dry cell power supply, and more particularly, to a gas appliance which opens, discharges, and ignites gas by a dry cell power supply.

[0002]

2. Description of the Related Art In general, a gas appliance provided with a magnet type safety valve is provided with an auxiliary device such as a push solenoid for forcibly pushing a magnet type safety valve to reset the valve opening. Further, until the thermocouple for misfire detection facing the pilot flame generates a predetermined electromotive force, the magnetic safety valve is forcibly opened and held by the power of the dry battery,
A so-called quick start ignition method is employed. Further, continuous spark is performed by the electric power of the dry battery 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 inform the user of the time to replace the dry battery.

[0003] However, when the replacement time of the dry battery is neglected, there is a case where the magnet type safety valve cannot be held open due to a voltage drop even if the push solenoid is pushed to reset the magnet safety valve. Also, the magnetic safety valve is pushed and opened momentarily,
Although the magnetic safety valve could not be held open and was immediately closed, fuel gas was instantaneously released. Even if the push solenoid is used to push the solenoid valve and the magnet-type safety valve is kept open, the ignition may explode if the spark discharge interval by the igniter becomes longer due to the voltage drop. Was.

[0004]

The gas appliance according to the present invention solves the above-mentioned problems, and has a safe water heater that does not emit fuel gas instantaneously and does not ignite overflow even if the dry cell voltage is reduced. The purpose is to provide.

[0005]

According to the gas appliance of the present invention which solves the above-mentioned problems, a gas thermocouple which generates an electromotive force due to combustion heat and a gas flow which is generated when the electromotive force of the thermocouple is reduced when combustion is abnormal are reduced. A magnetic safety valve to shut off the road,
At the time of ignition until the electromotive force of the thermocouple rises, a magnet valve drive circuit that energizes the magnet type safety valve and holds the valve open, and an auxiliary device that pushes the magnet type safety valve to reset it to the valve opening position In a gas appliance having a drive circuit, an igniter circuit that generates spark discharge and ignites fuel gas, and a dry cell power supply that supplies power to each of the above circuits, a gas appliance equipped with a dry cell power supply at the time when each part can operate due to a decrease in the dry battery power The gist is that the power supply voltage is set to have a relationship 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-described structure, the power supply voltage at the time when each part can operate due to a decrease in the power supply of the dry battery is set to [operating limit voltage of auxiliary device drive circuit> operating limit voltage of magnet valve drive circuit> igniter circuit> Operating limit voltage]. Therefore, when the auxiliary device drive circuit resets the magnet type 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 surely opens the magnet type safety valve. Continue combustion by holding the valve. As a result, even if the voltage of the dry battery drops, the ignition is performed normally and the combustion is performed as long as the magnetic safety valve is opened. Further, when the voltage of the dry battery further decreases, the fuel valve is not released because the magnet type safety valve remains closed.

DETAILED DESCRIPTION OF THE INVENTION

In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the gas appliance of the present invention will be described below with reference to FIGS. 1 to 3. 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 to open the pilot type water shutoff valve 3 via the lever, and the water in the water supply pipe 1 is supplied to the heat exchanger 5 through the temperature control valve. Let it flow inside. On the other hand, the instrument plug 6 installed in the gas passage 2 is pushed open, a 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 inserted in the passage 2. And a push rod 121 of the solenoid 12
Is located opposite to the gas valve 211 of the magnet type safety valve 21. When the solenoid 12 is excited (hereinafter simply referred to as actuation), the push rod 121 is advanced, and the gas valve 211 of the magnet type safety valve 21 is pushed open. When the magnet type 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 as a heat-sensitive element
2 shows a thermocouple circuit comprising a magnet 212 of a magnet type safety valve 21 and a controller 10 for applying an exciting current to the magnet 212. A commercial battery power supply 100 is installed in the controller 10. The battery power supply 100 includes a water pressure switch 94 and a lever switch 1.
A magnet valve driving circuit 101 for attracting and holding the magnet type safety valve 21 through the contact of the gas valve 44;
11 is electrically connected to a push solenoid drive circuit 102 for pushing and opening the push solenoid. 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 is provided with the magnet valve drive circuit 101 and the push solenoid drive. The operation time of the circuit 102 and the igniter drive circuit 103 is controlled.

When the push button 11 is pressed, the lever switch 144 is driven by the lever to close its contact, and when the hydraulic pressure responsive device 9 moves forward, the contact of the hydraulic switch 94 is closed, and the igniter circuit 103 is closed. Is activated, and a spark is discharged from the ignition rod 19. At the same time, by applying an operating voltage to the push solenoid 12 for a short time and flowing the excitation current Ips, the push solenoid 12
, The magnet safety valve 21 is forcibly opened by the push rod 121 and the gas valve 211 is pushed. At the same time, the magnet 212 opens and holds the gas valve 211 by applying an attraction holding voltage to the primary coil of the magnet 212 and flowing the excitation current Iq. Then, when the combustion is started, the thermocouple 22 is heated, and the exciting current Img starts flowing to the secondary coil of the magnet 212 by the generated thermoelectromotive force. Excitation current I to primary coil of magnet 212
Although q is reduced stepwise, the magnet 21
Since the exciting current Img of the secondary side coil increases,
The magnet 212 keeps the gas valve 211 open. When the combustion flame has disappeared, the excitation current Img due to the combustion heat decreases, the magnet 212 loses the valve opening holding force, and the gas valve 211 is closed.

Here, a magnet valve driving circuit 101, a push solenoid driving circuit 102, and an igniter circuit 103 when the voltage of the battery power supply 100 decreases.
Specifies the operating limit of When the battery power supply 100 is exhausted,
When the voltage decreases, the current value of the circuit decreases, the function of each circuit decreases, and finally the circuit does not operate. (Note that a load voltage detection circuit may be provided or provided so as to stop the operation of the entire gas appliance when the voltage of the battery power supply falls below a predetermined voltage. Therefore, priority is given to the function stoppage of each circuit due to a voltage drop with emphasis on safety. The limit load voltage at which each circuit can operate (power supply voltage during operation)
In the magnet valve drive circuit 101, Eps (mi
n), in the push solenoid drive circuit 102, Eps
(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 to reliably ignite. 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 needs to keep the gas valve 211 open to continue combustion. Therefore, Eq (min) <Eps (m
in). Further, when the magnet valve drive circuit 101 holds the gas valve 211 open, the spark generated 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 to limit the current value to each circuit by electric resistance or the like, or to adjust the load to be operated by each circuit or to adjust the operation efficiency, so that the operable power supply voltage (load voltage) is in the above order. Set to be.

As described above, when the battery voltage drops, the push solenoid drive circuit 102 stops operating first, and thereafter the magnet valve drive circuit 101 stops operating. Also in this case, the igniter circuit 10
Sparking by 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 risk of raw gas flowing out. 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 of the burner 13, so that raw gas emission or explosive ignition occurs. Nothing is done. Further, since the magnet valve drive circuit 101 also operates reliably and the magnet type safety valve 21 is kept open, the combustion is continued without closing the magnet type safety valve 21 before the electromotive force of the thermocouple 22 rises. I do.

The embodiment of the present invention has been described above.
The present invention is not limited to these embodiments at all, 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, a push solenoid is used as a driving device for pushing and opening the magnet type safety valve. However, another valve opening method using a dry battery power supply may be adopted. Although the case where the thermocouple 22 is inserted in the flame of the pilot burner 18 has been described, 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 reduced, when the magnet type safety valve is opened, normal ignition is performed. It is safe because no raw gas is released. Further, since the magnet is securely attracted and the valve is kept open to continue burning, the valve does not close once after ignition, and does not disappear, thereby improving usability.

[Brief description of the 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 the magnet valve driving circuit according to the embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 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 limit of operation of auxiliary device (push solenoid) Eq (min) Power supply voltage at the limit of operation of the magnetic safety valve Eig (min) Power supply voltage at the limit of operation of the igniter

Claims (1)

(57) [Claims] A thermocouple for generating an electromotive force by combustion heat; a magnet-type safety valve for shutting off a gas flow path due to a decrease in the electromotive force of the thermocouple when combustion is abnormal; and an electromotive force for the thermocouple. At the time of ignition until it rises, a magnet valve drive circuit that energizes the magnet type safety valve to hold the valve open, an auxiliary device drive circuit that pushes the magnet type safety valve to reset it to the valve open position, In a gas appliance including an igniter circuit that generates and ignites fuel gas and a dry cell power supply that supplies power to each of the above circuits, the power supply voltage at the time when each part can operate due to the decrease in the dry cell power supply is set to [Auxiliary device drive Circuit operation limit voltage> magnet valve drive circuit operation limit voltage> igniter circuit operation limit voltage]. Gas appliances.