JPH0461992B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a gas combustion control device, and more specifically, it aims to simplify and downsize the device configuration, improve operability, and extend the life of a power source battery. This invention relates to an ivy gas combustion control device.

[Conventional technology]

A conventional example of a combustion control device for a gas combustion appliance will be explained with reference to FIG.

When knob 1 is pressed, plunger 3 of solenoid valve 2 is pressed against iron core 5, valve 6 is opened, and gas flows in the direction of the arrow.

Next, when the knob 1 is rotated, the knob 7 is opened, gas flows into the pilot burner 8, and the pilot burner 8 is ignited by an igniter (not shown) linked to the knob 1. Pilot burner 8
The thermocouple 9 is heated by the pilot flame, and the electromotive force is supplied to the coil 4 of the solenoid valve 2 to excite the iron core 5.

After a few seconds, when the thermocouple 9 is sufficiently heated, its thermoelectromotive force resists the biasing force of the spring 11 and pushes the iron core 5.
is large enough to maintain the plunger 3 in an adsorbed state.

At this time, even if the pressing force of knob 1 is released, valve 6
can continue to remain open.

Furthermore, when the knob 1 is rotated, the pot 10 is opened, and the main burner 12 is ignited by the starter of the pilot burner 8, resulting in a steady combustion state.

If both the main burner 12 and the pilot burner 8 go out due to an unexpected accident, the temperature of the thermocouple 9 decreases, the thermoelectromotive force weakens, and the biasing force of the spring 11 increases, causing the valve 6 to close. , the gas supply is cut off.

[Problem to be solved by the invention]

Since the conventional combustion control device for gas appliances is configured as described above, it is necessary to keep pressing the knob 1 for several seconds after the pilot burner 8 is ignited until the plunger 3 is attracted to the iron core 5. In addition to being extremely inconvenient to operate, there was also the risk of raw gas leaking out.

In order to solve these problems,
Publication No. 140981 is disclosed.

JP-A No. 59-140981 uses a battery and a thermoelectric element in combination, and uses battery power during the initial attraction of the solenoid valve, and switches to the electromotive force of the thermoelectric element after the solenoid valve attracts the electromagnetic valve. This holds the valve in a suction state. In other words, this technology aims to eliminate the operational inconveniences of the conventional technology and improve reliability by suppressing the outflow of raw gas.Although it has solved the above problems, it is equipped with a temperature control circuit and its temperature control The on/off control of the transistor is performed by the on/off operation of the circuit, which has the problem of making the circuit complicated and increasing the price. Further, since the thermoelectric element uses a thermocouple, the attraction force is small, and two plunger excitation coils are used, one for attraction and one for attraction.

The present invention was proposed to solve these drawbacks, and provides a gas combustion control device for gas appliances that does not require a complicated control circuit, has an extremely simple configuration, is small, lightweight, and inexpensive. This is the issue.

[Means to solve the problem]

The present invention solves the above-mentioned problems, and the first invention is a gas combustion control device comprising the following technical means.

(a) A solenoid valve installed in the gas pipe of the gas burner (b) A dry battery circuit that excites the plunger control coil of the solenoid valve to open the valve when the burner is ignited (c) A dry battery circuit connected in parallel to the dry battery circuit to Thermoelectric element circuit heated by a gas burner with a diode of opposite polarity inserted (d) A time switch that cuts off the dry battery circuit.

Further, the second invention of the present invention is to replace the above (c) and (d) with the following
(e), modified as shown below.

(e) A thermoelectric element circuit connected in parallel to the dry battery circuit and heated by a gas burner; (f) An interlocking relay switch with a timed circuit that simultaneously switches the dry battery circuit and the thermoelectric element circuit.

Furthermore, in the first and second inventions, the thermoelectric element of the thermoelectric element circuit has a high-temperature internal resistance equivalent to the resistance value of the coil, and impedance matching is achieved to efficiently control the electromotive force of the thermocouple with a plunger. can be applied to the coil for use.

[Effect]

The present invention produces the following effects.

In order to prevent the dry battery current from flowing into the thermoelectric element side, a diode with a polarity opposite to that of the battery is provided in the thermoelectric element circuit, or a changeover switch is provided, so that the life of the dry battery can be extended.

When the thermoelectromotive force of the thermoelectric element excites the plunger control coil and the plunger maintains the gas flow path in an open state, the high-temperature internal resistance value of the thermoelectric element is made equal to the resistance value of the plunger control coil to create an impedance. Because of the matching, as is well known in circuit theory, the electromotive force of the thermoelectric element is utilized to the maximum extent to excite the control coil, ensuring reliable operation of the plunger.

〔Example〕

An embodiment of the present invention is shown in FIG. In addition, the first
Although the figure differs in appearance from FIG. 2, components with the same drawing numbers have the same functions. Further, in FIG. 1, the cocks 7 and 10, the pilot burner 8, the igniter, etc. are not shown.

In this embodiment, a circuit of a thermocouple 9 and a circuit of a dry battery 14 for excitation of the coil 4 are connected in parallel to the coil 4 of the iron core 5. The dry battery circuit is connected to the dry battery 14 by turning on the one-touch switch 13.
A start contact 18 is provided to turn on the switch. Further, a relay circuit 15 is provided that turns off the start contact 18 after a predetermined period of time has passed since the switch 13 is turned on.

Also, a thermocouple 9 and a plunger control coil 4
In the meantime, the thermoelectromotive force of the thermocouple 9 is in the forward direction,
In addition, a diode 16 that operates in the blocking direction is provided for the dry battery 14.

Note that instead of the diode 16, a delay contact 17 may be provided and turned off and on in response to the on and off of the start contact 18, respectively.

In this case, the delay contact 17 is turned on after a predetermined period of time has passed after the start contact 18 is activated.
After this, it is desirable to turn off the start contact 18 after allowing some time. The point is that the current from the dry battery 14 does not flow into the thermocouple 9 side,
Start contact 18 until the thermoelectromotive force reaches a predetermined value.
Don't turn it off.

With this configuration, ignition of the device can be accomplished by simply turning on the one-touch switch 13 manually. That is, when the one-touch switch 13 is turned on, the dry cell battery 14 is connected to the coil 4, and the plunger 3 resists the biasing force of the spring 11 and connects the iron core 5.
is adsorbed to. Therefore, the valve 6 is opened, gas flows in the direction of the arrow, and the main burner 12 is ignited. After a predetermined period of time has elapsed, the thermocouple 9 excites the coil 4 instead of the dry battery 14, and the plunger 3 is connected to the iron core 5.
Generates enough thermoelectromotive force to adsorb the material. If this timing is set by the relay circuit 15 and the contact 18 is turned off by the relay circuit 15, the device will be in a steady ignition state.

Furthermore, when the main burner 12 goes out due to an accident or the like, the thermoelectromotive force of the thermocouple 9 decreases and eventually cannot resist the biasing force of the spring 11, the plunger 3 returns and the valve 6 shuts off the gas flow path. .

The resistance value of the plunger control coil 4 is normally 3 to 7 Ω when using a dry battery power source, and the resistance value of the plunger control coil 4 is usually 3 to 7 Ω.
The internal resistance value of the thermocouple 9 when the thermoelectromotive force excites the plunger control coil 4 and the plunger 3 maintains the gas flow path in an open state is:
Since it is easy to make the internal resistance value of a PN junction thermocouple (Special Publication No. 52-47677) equal to the internal resistance value of coil 4 at the operating temperature, we decided to make it equal to the internal resistance value of coil 4. Therefore, the thermoelectromotive force of the thermocouple can be efficiently used for the plunger control coil.

For example, the area of the junction of the thermocouple 9 is usually about 12 ^mm2 , but if this area is narrowed, the internal resistance can be reduced by 3 to 3 mm.
It can be set to 7Ω. Alternatively, the winding cross-sectional area of the coil 4 may be adjusted so that it becomes equal to the internal resistance of the thermocouple 9.

〔Effect of the invention〕

The present invention has the following excellent effects.

It is possible to extend the life of dry batteries.

Furthermore, by using a PN junction thermocouple as a thermoelectric element, its internal resistance at the operating temperature can be made equal to the internal resistance of the solenoid valve coil, making it possible to make maximum use of its thermoelectromotive force. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional example. 1...Knob, 2...Solenoid valve, 3...Plunger,
4...Coil, 5...Iron core, 6...Valve, 7...Kotuku, 8
...Pilot burner, 9...Thermocouple, 10 pieces,
11...Spring, 12...Main burner, 13...
One-touch switch, 14... Dry battery, 15... Relay circuit, 16... Diode, 17... Delay contact, 18... Start contact.

Claims (1)

[Scope of Claims] 1. A solenoid valve provided in a gas pipe of a gas burner; a dry battery circuit that excites a coil of the solenoid valve to open the valve when the burner is ignited; 1. A gas combustion control device comprising: a thermoelectric element circuit which is heated by a gas burner and has a diode of opposite polarity therebetween; and a time switch which shuts off the dry battery circuit. 2. A solenoid valve installed in the gas pipe of the gas burner, a dry battery circuit that excites the coil of the solenoid valve to open the valve when the burner is ignited, and a thermoelectric element circuit connected in parallel to the dry battery circuit and heated by the gas burner. A gas combustion control device comprising: and an interlocking relay switch with a timer circuit that simultaneously switches the dry battery circuit and the thermoelectric element circuit. 3. The gas combustion control device according to claim 1 or 2, wherein the thermoelectric element of the thermoelectric element circuit has a high-temperature internal resistance equivalent to a resistance value of the coil.