JPS5812025Y2 - Safety devices for gas combustion equipment - Google Patents

Description

[Detailed description of the invention] This invention is installed in gas combustion equipment, and automatically stops the gas supply when combustion stops (misfire) due to blowout, etc., or when incomplete combustion occurs due to lack of oxygen. Regarding safety equipment.

Conventionally, oxygen concentration batteries in which a porous electrode layer is provided on a sintered body of an oxygen ion conductive solid electrolyte such as stabilized zirconia have been used as oxygen deficiency and/or misfire sensors, and the batteries have also been used as electromagnetic sensors for opening and closing gas supply channels. A safety device for gas combustion equipment has been proposed in which a solenoid valve is used as a power source for a valve and automatically closes a gas supply path when oxygen deficiency or misfire occurs.

However, this type of safety device requires that after the oxygen concentration battery is heated to a temperature of 600°C or higher by the combustion flame of the gas combustion equipment, the electromotive force and output impedance of the battery are the values necessary to keep the solenoid valve open. becomes.

This temperature rise time is long (several tens of seconds), so when using gas-fired equipment, the setting device must be pressed with a child for several tens of seconds to set the safety device, which is cumbersome. There were drawbacks.

It is an object of the present invention to eliminate such drawbacks and provide a safety device for gas combustion equipment that uses an oxygen concentration battery as a sensor and power source and can be set up in a short time.

The present invention constructs an oxygen concentration battery by providing a porous electrode on a sintered body of an oxygen ion conductive solid electrolyte, and uses this oxygen concentration battery as an oxygen deficiency sensor case and/or a misfire sensor, as well as a gas supply path. Gas combustion equipment that uses a solenoid valve for opening and closing as a power source to operate it, and when the gas is normally combusted, the output keeps the solenoid valve open, and when the output decreases due to oxygen deficiency or misfire, the solenoid valve closes. In a safety device, a mechanical self-timer device keeps the solenoid valve open until the output of the oxygen concentration battery is large enough to keep the solenoid valve open after the gas-fired appliance is ignited. The present invention will now be explained based on one implementation shown in the drawings.

1 is an oxygen concentration battery fixed in front of the panel-shaped main crater of gas combustion equipment as an oxygen deficiency sensor.
Platinum, rhodium, palladium or its alloy casing or titanium dioxide is uniformly coated on both sides of a sintered body plate of oxygen ion conductive solid electrolyte such as ZrO2, TrO2, CeO2 etc. stabilized with SrO, Y2O3, La2O3, 5c203 etc. Formed in the form of a porous thin film (porous electrode), one electrode of the oxygen deficiency sensor 1 is in contact with the combustion flame of a gas combustion device that burns with excess oxygen during normal combustion, and the other electrode is always in contact with the combustion flame of a gas combustion device that burns with excess oxygen. It is placed in contact with the combustion flame of gas-fired equipment that burns in the absence of oxygen.

2 is a panel-shaped main crater that burns with excess oxygen during normal combustion, 21 is a burner that always burns with insufficient oxygen, 3 is a gas supply path, 4 is a solenoid valve for opening and closing the gas supply path, 41 is its electromagnet, and 42 is a solenoid. , 43 is a movable body with a valve lid 44 fixed to the lower end, 45 is a valve port, 46 is a spring that biases the movable body 43 in the direction of the valve port 45, and 5 is a safety device set that pushes the movable body 43 in the direction of the electromagnet 41. Sera rod for use, 51 is its knob, 5
2 is a spring that urges the set rod downward; 6 is a spring that presses the movable body 43 against the electromagnet 41 by operating the set rod 5, and then fixes the set rod 5 in that position for a certain period of time; It is a self-timer device to be released, and the housing 61
A self-timer 7 that is attached to the set rod 5 and rotates the set rod is movable in the axial direction, and a locking rod 53 that protrudes from the set rod 5 when the self-timer 1 is not set. and a notch 63 formed in a locking wall 62 provided at a predetermined position within the housing 6 are arranged to have one value.

This set of safety devices for gas combustion equipment is done in a number of ways.

1 Push the setting rod 5 to press the movable body 43 against the electromagnet 41, open the valve port 45, and ignite the main nozzle 2 or burner 21.

Next, twist the housing 51 half a turn counterclockwise.

As a result, the locking rod 53 comes to the position 53', and the coil spring 71 inside the self-timer 7 is wound, and the housing 5!
When you release your hand, the set rod 5 gradually moves clockwise (arrow B) while driving the escape wheel 72 which is interlocked via the transmission mechanism.
direction) and rotate.

After a predetermined period of time has elapsed, the locking rod 53 comes to the position of the notch 63, and returns to the original position shown in FIG. 2 by the elastic force of the spring 52.

During this time, the oxygen deficiency sensor 1 is in an oxygen-containing atmosphere for one electrode, and an oxygen-free atmosphere for the other electrode.
The temperature rises from 0°C to 800°C and an electromotive force of about 0.8 V is generated, and current flows through the solenoid 42 and the electromagnet 41 moves to the movable body 43.
Since the gas is attracted against the elastic force of the spring 46, the gas supply continues.

In this way, the self-timer device connects the movable body 43 to the electromagnet 4.
Since the safety device is held in the pressed state at 1, there is no need for troublesome operations such as manually pushing the setting lever 51 for several tens of seconds, and the safety device can be set with one touch.

As described above, the safety device of the present invention uses a self-timer device to keep the solenoid valve open for a predetermined period of time, so it can be conveniently set up in a short time.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a safety device for a gas combustion device and a gas combustion device showing an embodiment of the present invention, FIG. 2 is an enlarged view of the self-timer, and FIG. 3 is a cross-sectional view taken along the line A-A. In the figure, 1...Oxygen deficiency sensor, 4...Solenoid valve for opening/closing gas supply path, 6...Self-timer device.

Claims (1)

[Scope of utility model registration request] An oxygen concentration battery is constructed by providing a porous electrode on a sintered body of an oxygen ion-conducting solid electrolyte, and this oxygen concentration battery is used as an oxygen deficiency sensor case and/or a misfire sensor, as well as a solenoid valve for opening and closing a gas supply path. It is used as a power source for gas combustion equipment, and its output keeps the solenoid valve open during normal gas combustion, and the valve closes when the output of the oxygen concentration battery decreases due to oxygen deficiency or misfire. In safety equipment,
A mechanical self-timer device is used to keep the solenoid valve open until the output of the oxygen concentration battery reaches the value required to keep the solenoid valve open after the gas combustion equipment is ignited. Safety equipment for gas combustion equipment.