JPH02256982A - Electromagnetic valve device for gas equipment - Google Patents

Abstract

PURPOSE:To improve the reliability of a device as well as to reduce its weight and cost by connecting, to a plunger controlling coil, an exciting power supply thereof and a start contact, for turning on this power supply, in parallel to a thermocouple circuit. CONSTITUTION:An exciting dry cell 14 of a coil 4 and a start contact 18, turning on the dry cell 14 by turning on a one-touch switch 13, are parallelly connected with a thermocouple circuit to the coil 4 of an iron core 5 in parallel with a thermocouple 9. A relay circuit 15, which turns off the start contact 18 after the predetermined time from turning on the one-touch switch 13, is provided. Thus, reliability can be improved in a device as well as its size, weight and cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J] The present invention relates to a solenoid valve device for a gas combustion appliance, and more specifically, to a gas combustion appliance that has a simpler and smaller appliance configuration and improved operability. This invention relates to a solenoid valve device for use.

[Prior Art 1] A conventional example of a solenoid valve device for a gas combustion appliance will be described 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 L is rotated, the cock 7 opens and gas flows into the pilot burner 8, which fires the igniter (
(not shown) ignites the pilot burner 8. Thermocouple 9 was activated by Pyro Ntono (-8).
is heated, 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 the iron core 5 is pushed into the plunger 3.
is large enough to maintain the adsorbed state.

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

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

Main burner 12 due to an unexpected accident. Pilot burner 8
When both disappear, the temperature of the thermocouple 9 decreases, the thermoelectromotive force weakens, and the biasing force of the spring 11 increases, the valve 6 closes and the gas supply is cut off.

[Problem to be Solved by the Invention 1] Since the conventional solenoid valve device for a gas combustion appliance is configured as described above, the time required for the plunger 3 to become attracted to the iron core 5 after the pilot burner 8 is ignited is It is necessary to keep pressing the knob 1 for several seconds, which is extremely inconvenient in operation, and there is also a risk that the raw gas may leak out.

In order to solve these problems,
No. 50 is disclosed.

However, Utility Model Application No. 59-97350 converts the thermoelectromotive force of the thermocouple into alternating current, amplifies it, and when the amplified output exceeds a predetermined value, excites a coil that attracts the plunger for a predetermined period of time. This was designed to shorten the time required to press the knob, minimize the outflow of raw gas, and improve reliability. Although it solved the above-mentioned problems, the single circuit configuration was complicated and the There is a problem with pricing.

The present invention was proposed in order to solve the above-mentioned problems, and provides a small, lightweight, and inexpensive solenoid valve device for gas appliances that has an extremely simple configuration by adding commercially available parts to a conventional device. This is the issue.

[Means for Solving the Problems] The present invention solves the above-mentioned problems, and includes an ignition system that presses the plunger against the urging force of the subjump to open the gas flow path and ignites the gas. A thermocouple detects the temperature rise due to gas combustion, and after a predetermined period of time has elapsed since the gas is ignited, the plunger control coil is excited by the thermoelectromotive force of the thermocouple, and the plunger controls the gas flow path instead of pressing. A solenoid valve for gas appliances, which is equipped with a solenoid valve that is held in an open state and, when the gas is extinguished, the thermoelectromotive force disappears and the plunger is returned by the biasing force of a spring to keep a gas flow path in a closed state. The first technical means was applied to the valve device. In other words, the plunger control coil is connected in parallel to the thermocouple circuit with a power supply for excitation of the coil and a start contact that turns on the power supply when a one-touch switch is turned on, and when the one-touch switch is turned on. This electromagnetic valve device for gas appliances is characterized in that it includes a time limit circuit that turns off a start contact after a predetermined period of time has passed.

Between the thermocouple and the plunger control coil, there is a diode that operates in the forward direction against the thermoelectromotive force of the thermocouple and in the blocking direction against the dry battery, or it is turned off and on depending on whether the start contact is on or off. If you install a contact that operates on
Since the dry battery current does not flow into the thermocouple side, the excitation of the coil by the dry battery can be made effective.

In addition, the internal resistance value of the thermocouple when the thermoelectromotive force of the thermocouple excites the plunger control coil and the plunger keeps the gas flow path open is the resistance of the plunger clouding coil. By matching the values, the electromotive force of the thermocouple can be efficiently used for the plunger control coil.

Furthermore, if the power source is composed of dry batteries, it is possible to reduce the size and weight.

[Function] The present invention has the following features: (1) Manual operation is very simple because it only requires turning on a one-touch switch.

(2) Since the diode or start contact is provided so that the dry battery current does not flow into the thermocouple side, the plunger control coil can be excited more effectively.

■The internal resistance value of the thermocouple when the thermoelectromotive force of the thermocouple excites the plunger control coil and the plunger keeps the gas flow path open is the resistance value of the plunger control coil. As is well known in circuit theory, the electromotive force of the thermocouple is maximally utilized to excite the control coil, and the plunger is reliably operated.

■Since the conventional electromagnetic valve device for gas appliances is constructed by connecting dry batteries and simple commercially available circuit parts, the device is also small and simple.

[Example J] An example of the present invention is shown in FIG. Differences from the conventional example shown in FIG. 2 will be explained. Although the present invention and the conventional example have different appearances in the drawings, components having the same drawing number have the same function. Further, in FIG. 1, the cock 7 and lO, the pilot burner 8, the igniter, etc. are not shown.

In the present invention, first, a thermocouple is connected to the coil 4 of the iron core 5 in parallel with the thermocouple 9, and a start contact 18 that turns on the dry cell 14 by turning on the dry cell 14 for excitation of the coil 4 and the one-touch switch 13. A relay circuit 15 is connected in parallel with the circuit and turns off the start contact 18 after a predetermined period of time has passed since the one-touch switch 13 is turned on.

In addition, between the thermocouple 9 and the plunger control coil 4, a dry cell 14
A diode 16 is provided which operates in the blocking direction.

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

In this case, the start contact 18 is activated and the delay contact 17 is turned on after a predetermined period of time has elapsed, but after this, it is desirable to turn off the later start contact 18 with some time margin. The current of the dry battery 14 should not flow into the thermocouple 9 side, and the start contact 18 should not be turned off until the thermoelectromotive force reaches a predetermined value.

With this configuration, ignition of this 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 battery 14 is connected to the coil 4, and the plunger 3 is attracted to the iron core 5 against the urging force of the spring II. 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 instead of the dry battery 14 excites the coil 4 and generates thermoelectromotive force sufficient to attract the plunger 3 to the iron core 5.

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.

Also, if the main burner 12 goes out due to an accident,
The thermoelectromotive force in the thermocouple 9 decreases until it cannot resist the biasing force of the spring 11, the plunger 3 returns and the valve 6 blocks the gas flow path.

The resistance value of the plunger control coil 4 is normally 3 to 7Ω when using a dry cell battery power source, and the thermoelectromotive force of the thermocouple 9 excites the plunger control coil 4, causing the plunger 3 to open the gas flow path. The internal resistance value of the thermocouple 9 when it is held at
7677) at the operating temperature and coil 4
Since it is easily possible to match the internal resistance value of the coil 4, the electromotive force of the thermocouple can be efficiently used for the plunger control coil by matching the internal resistance value of the coil 4.

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 made 3 to 7 Ω.Alternatively, the cross-sectional area of the winding of the coil 4 can be adjusted. It may be matched with the internal resistance of the thermocouple 9.

[Effect of the invention] The present invention has the following excellent effects.

■Since the solenoid valve device for gas appliances is constructed by connecting simpler circuit parts than the conventional solenoid valve device for gas appliances, it is possible to reduce the size and weight, reduce the cost, and improve the reliability of the device.

■Unlike conventional methods, there is no need to press the plunger for a few seconds until the thermoelectromotive force of the thermocouple stabilizes, and all you have to do is turn on the one-touch switch, improving operability.

■It is possible to extend the life of dry batteries.

[Brief explanation of drawings]

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...Cock 8...Pilot burner 9...-Thermocouple IO ... Cock 11 ... Spring 2 ... Main burner 3 ... One-touch switch 4 ... Dry battery 5 ... Relay circuit 6 ... Diode 7 ... - Delay contact 8 - - Start contact applicant

Claims (1)

[Claims] 1. An ignition device that presses a plunger against the biasing force of a spring to open a gas flow path and ignite the gas;
A thermocouple detects the temperature rise due to gas combustion, and after a predetermined period of time has passed since the gas is ignited, the plunger control coil is excited by the thermoelectromotive force of the thermocouple, and instead of the pressure, the plunger controls the gas flow path. and a solenoid valve that maintains the gas passage in the open state and, when the gas is extinguished, the thermoelectromotive force disappears and the plunger is returned by the biasing force of the spring to maintain the gas flow path in the closed state. In the electromagnetic valve device for appliances, a power source for exciting the coil and a start contact that turns on the power source by turning on a one-touch switch are connected to the plunger control coil in parallel with the thermocouple circuit. A solenoid valve device for gas appliances, further comprising a time limit circuit that turns off the start contact after a predetermined period of time has passed since the one-touch switch is turned on. 2 between the thermocouple and the plunger control coil;
A diode that operates in the forward direction with respect to the thermoelectromotive force of the thermocouple and a blocking direction with respect to the dry battery, or a contact that operates to turn off and on in response to the on and off of the start contact, respectively, is provided. The solenoid valve device for gas appliances according to claim 1, characterized in that: 3. The internal resistance value of the thermocouple when the thermoelectromotive force of the thermocouple excites the plunger control coil and the plunger maintains the gas flow path in an open state. The electromagnetic valve device for gas appliances according to claim 1 or 2, characterized in that the resistance value of the solenoid valve device is matched with the resistance value of the solenoid valve device. 4. Claim 1, wherein the power source is a dry battery.
The solenoid valve device for gas appliances according to any one of items 3 to 3.