JPS6347714Y2 - - Google Patents

Description

[Detailed description of the invention] The purpose of this invention is to provide a combustion control device for a gas combustor that can be used to ignite and extinguish a gas combustor with a single touch operation by simply turning a switch ON and OFF, and that can also be easily controlled remotely. It is something to do.

Conventionally, a circuit consisting of a thermocouple that generates a thermoelectromotive force when heated by a pilot burner flame, and an electromagnetic coil of an electromagnetic safety valve that opens and closes a fuel supply passage using the thermoelectromotive force, is connected to a DC power source and charged in advance during ignition operation. There is a so-called quick-start combustion safety device that connects a capacitor with a changeover switch to shorten the time it takes for the thermoelectromotive force of a thermocouple to reach a value that keeps the electromagnetic safety valve open. During operation, it is necessary to press a movable piece of iron against the electromagnet of the electromagnetic safety valve, although it is only for a short time. Therefore, it is not possible to ignite with the one-touch operation of turning on the switch, and remote control is required. Because it uses wire, there are various restrictions and inconveniences when installing it. In addition, an ignition device has been proposed that uses a solenoid to automatically press the movable iron piece, but the solenoid is activated only for a predetermined period of time until the thermoelectromotive force reaches a value that attracts and holds the movable iron piece. The drawback is that a complicated and expensive control circuit must be provided to maintain the control. Furthermore, in conventional fire extinguishing operations, the fuel supply passage must be closed manually, such as by turning a knob, which is particularly troublesome when using a wire-based remote control, and requires various functions not found in one-touch switch operations. There are restrictions.

This idea was made in view of the above points, and the main point is that a solenoid for pressing a movable iron piece is incorporated into a quick-start type combustion safety device, and the device is connected to a DC power source and charged before ignition operation. Of the two capacitors that were prepared, one of the capacitors is used for quick start, and during ignition operation, connect it to the circuit consisting of the thermocouple and the electromagnetic coil of the electromagnetic safety valve via the charge/discharge switch. At the same time, the other capacitor was used for operating the solenoid, and the capacitor was connected to the excitation coil of the solenoid and the igniter via a charge/discharge switch, so that the discharge was made to the excitation coil of the solenoid and the igniter. It is something. Furthermore, when extinguishing a fire, the two capacitors are switched to the DC power supply side, and
The voltage of the DC power supply is applied to the electromagnetic coil of the electromagnetic safety valve with the reverse polarity via a reset type changeover switch, so that the fire can be extinguished simply by operating the switch.

An embodiment of this invention applied to a gas water heater will be described below with reference to the drawings.

In FIG. 1, before the ignition operation, a capacitor _C1 connected to a DC power source E via a charge/discharge switch _S1 and the charge/discharge switch _S1
Other young discharge selector switches that turn on and off at the same time
2 of the other capacitors C ₂ connected via S ₂
When the capacitors C ₁ and C ₂ are ignited, the charge/discharge switch S ₁ switches the capacitors C 1 and C ₂ to one.
is connected to a circuit consisting of a thermocouple TC that generates a thermoelectromotive force when heated by a pilot burner flame, and an electromagnetic coil Mg of an electromagnetic safety valve A that opens and closes the fuel supply passage 1 by the thermoelectromotive force of the thermocouple TC, The other capacitor _C2 is connected to the parallel circuit of the igniter IG and the excitation coil M of the solenoid 2 by the charging/discharging switch _S2 .
The thermocouple TC and the electromagnetic coil are connected via the water flow switch S ₃ which turns OFF, and the reset type switches PS ₁ and PS ₂ which turn ON the conductors led out from both ends of the DC power supply E in conjunction with the extinguishing operation. A reset switch PS 3 is connected between the electromagnetic coil Mg and the DC power source E, and the reset switch PS ₃ is turned off in conjunction with the fire extinguishing operation. The configuration is such that the voltage E is temporarily applied with its polarity reversed. That is, during the fire extinguishing operation, PS ₁ and PS ₂ are turned on and PS ₃ is turned off at the same time, so that short circuiting of the DC power source E is prevented. In the diagram, F is fuse, R
It is resistance.

FIG. 2 shows an example of a fuel supply passage opening/closing device used in this invention, in which the electromagnetic coil
A movable iron piece 4 installed opposite an electromagnet 3 wound with Mg is connected to a safety valve 6 via a shaft 5, and when not in use, the safety valve 6 is pressed against its valve seat 8 by a spring 7 to fuel fuel. A pressure rod 9 is connected to the safety valve 6 so as to close the supply passage 1, and the pressure rod 9 is connected to one end of an interlocking lever 10. The other end of the interlocking lever 10, which is pivotally installed so as to be swingable, is connected to the plunger 12 of the solenoid 2. Reference numeral 13 denotes a spring which is interposed on the other end side of the interlocking lever 10 and biases the left end of the lever 10 in the clockwise direction (upwards) as shown in the drawing, and when the solenoid 2 is demagnetized, the plunger 12
automatically returns to the position indicated by the number of points shown. Also, the plunger 12 of the solenoid 2 has an operating rod 1.
4 are connected in series, and a gas supply passage 1 to a primary pilot (ignition pilot) burner (not shown) is connected to this.
A valve body 16 for opening and closing 5 is fixedly installed. 17 is a valve seat, 18 is a gas supply passage to a main burner (not shown), and 19 is a gas supply passage to a secondary pilot burner (not shown).

With the above configuration, when the charging/discharging switch S ₁ , S ₂ is turned on to the discharge side in conjunction with the ignition operation during the ignition operation, the two capacitors C ₁ , which were connected to the DC power source E and charged before the ignition operation are The connection of C ₂ is switched, and the first quick start capacitor C ₁ is connected to the circuit consisting of the thermocouple TC and the electromagnetic coil Mg, and the capacitor C ₁ is connected to the electromagnetic coil Mg.
The electric charge that had been charged flows through the electromagnet 3, and the electromagnet 3 is immediately excited to a state where it can attract and hold the movable iron piece 4.
On the other hand, the charge in the capacitor _C2 for operating the solenoid and igniter flows to the excitation coil M of the solenoid 2 and the igniter IG, and the plunger 12 of the solenoid 2 is attracted into the solenoid 2 against the biasing force of the spring 13, and the pivot 11 as a fulcrum, the interlocking lever 10 is rotated counterclockwise, and the shaft 5 connecting the safety valve 6 and the movable iron piece 4 is pushed up against the biasing force of the spring 7 through the push rod 9, and the safety valve 6 is pushed up against the valve seat. 8 to open the fuel supply passage 1, the movable iron piece 4 is brought into contact with the electromagnet 3, and the movable iron piece 4 is attracted and held by the electromagnet 3, which has already been excited by one capacitor _C1 , and the safety valve 16 is opened. At the same time, the actuating rod 14 is pulled down by the operation of the solenoid 2, the valve body 16 is separated from its valve seat 17, and the gas supply passage 15 to the primary pilot burner is opened, and the gas is transferred to the gas supply passage to the main burner. 18. The discharge current of capacitor C2 is supplied to the secondary pilot burner and the primary pilot burner simultaneously, and the discharge current of capacitor _C2 also flows to the igniter IG.
The spark generated between the electrodes forms a pilot flame that sequentially ignites the primary and secondary pilot burners. This pilot flame heats the thermocouple TC, and a thermoelectromotive current begins to flow through the electromagnetic coil Mg.
A composite current of the thermoelectromotive current of the thermocouple TC and the discharge current of the capacitor _C1 flows through the electromagnetic coil Mg of the electromagnetic safety valve A. Then, as time passes, the discharge current of capacitor C ₁ and capacitor C ₂ decreases, and the igniter IG stops sparking.
The magnetic force of the excitation coil M of the solenoid 2 also decreases, and when it can no longer resist the restoring force of the spring 13, the plunger 12 of the solenoid 2 moves upward due to the restoring force of the spring 13, and as a result, the valve body 16 moves upward. When the valve seat 17 is pressed and the gas supply passage 15 of the primary pilot burner is closed and the primary pilot burner is extinguished, the interlocking lever 10 is rotated clockwise to connect the movable iron piece 4 to the safety valve 6 and to the safety valve 6. The upward holding force of the pressing rod 9 is released, but at this time, the electromagnet 3 has a large magnetic force due to the discharge current of the capacitor _C1 and the thermocouple TC, so it overcomes the restoring force of the spring 7 and moves the movable iron piece. 4 and keep the fuel supply passage 1 open, and open the gas supply passage 1 to the secondary pilot and main burner.
9 and 18 continue to be supplied with gas. When water is supplied as necessary, a gas valve in a gas blinker (not shown) is opened, the gas supply passage 18 of the main burner is opened, and the secondary pilot burner flame is ignited and hot water is dispensed. In addition, if water is flowing during ignition operation, water flow switch S ₃ is turned OFF.
Therefore, the discharge current of capacitor C ₂ does not flow to the igniter IG and the excitation coil M of solenoid 2 and is not ignited. Therefore, it is safe because it is not ignited explosively and does not damage the equipment. Moreover, a switch operated by gas pressure may be provided in place of the water flow switch _S3 , so that the ignition does not occur when the main gas valve is open.

Next, when extinguishing the fire, turn on the charge/discharge switch.
Turn off S ₁ and S ₂ , switch the connection of capacitors C ₁ and C ₂ to the DC power supply E side, and at the same time turn off the reset switch.
Since PS ₁ and PS ₂ are turned ON and resettable switch PS ₃ is turned OFF, the polarity of the DC power supply E is reversed, and a voltage opposite to the voltage that was previously applied to the electromagnetic coil Mg of the electromagnetic safety valve A is applied. The electromagnet 3 is instantly demagnetized by canceling out the thermoelectromotive force, and the movable iron piece 4 is immediately separated from the electromagnet 3 by the restoring force of the spring 7.
The safety valve 6 is pressed against the valve seat 8, the fuel supply passage 1 is closed, the gas supply is stopped, and the fire is extinguished. still,
For implementation, install an ignition/extinguishing switch and a fire extinguishing switch in the controller, link the charging/discharging switches S ₁ and S ₂ with the ignition/extinguishing switch, and turn on the fire extinguishing switch to activate the reset switch.
PS ₁ , PS ₂ , and PS ₃ will work together,
This improves operability.

As mentioned above, according to this idea, the switch
The gas combustor can be reliably ignited and extinguished with a one-touch operation such as turning ON and OFF, and even when used in external water heaters and bathtubs, remote control can be performed using only electrical wiring. Its installation becomes easy. Furthermore, when extinguishing a fire, a current is passed in the opposite direction to the electromagnetic coil through the charge/discharge switch, so the gas supply is instantly stopped and there is no leakage of raw gas, resulting in high safety. Furthermore, since it is equipped with two capacitors: a quick start capacitor and a capacitor for operating the solenoid and igniter, each circuit has the advantage of providing desired discharge characteristics.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of an ignition device for a gas combustor according to this invention, and FIG. 2 is a sectional view showing an example of a fuel supply passage opening/closing device used in this invention. E...DC power supply, _S1 , _S2 ...Charge/discharge switch, _S3 ...Water flow switch, _C1 , _C2 ...Capacitor, TC...Thermocouple, 1...Fuel supply passage, 2
... Solenoid, Mg ... Electromagnetic coil, M ... Excitation coil, A ... Electromagnetic safety valve.

Claims (1)

[Scope of utility model registration request] In the electromagnetic coil Mg of the thermocouple type electromagnetic safety valve circuit,
A capacitor C ₁ charged in advance by a DC power source E is discharged at the time of ignition operation through a charge/discharge switch S ₁ that is linked to the ignition operation. The voltage of the other capacitor C ₂ is discharged to the electromagnetic coil M of the solenoid 2 and the igniter IG arranged to open the electromagnetic safety valve A by pressing it with the plunger 12 via another charge/discharge switch S ₂ that is linked to the ignition operation. At the same time,
A gas combustor characterized in that, during a fire extinguishing operation, the DC power source E is connected to the electromagnetic safety valve circuit with its polarity reversed through return type changeover switches PS ₁ , PS ₂ , PS ₃ that are linked to the extinguishing operation. Combustion control device.