JPS5837423A - Air vent device of gas appliance - Google Patents

Abstract

PURPOSE:To shorten the time of air vent by a method wherein short-time intermittent opening of a main burner is performed for venting air in the piping connected to gas appliance in addition to the opening of a pilot burner. CONSTITUTION:When a flow switch 3 is turned ON, a controlling valve 4 for the pilot burner is open through a controller 11 in order to lead gas to the pilot burner. At this time, when no ignition occurs immediately at the pilot burner in spite of electric discharges at an ignition plug 5 because of unsuccessful venting of the air in the piping, an air venting switch 12 is turned ON, resulting in interlocking a timer circuit 13 with the controller 11. The timer circuit 13 contains a function to open and close a controlling valve 8 for the main burner and opens and closes the controlling valve 8 intermittently for an arbitrary short time. Consequently, the time of air vent can be shorten and at the same time demerits such as explosive ignition, back fire and the like, which may occur when gas appliance is directly connected to a main burner, can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air venting device necessary for gas appliances such as gas water heaters.

Consider a water heater as an example of a conventional gas appliance.

Figures 1 and 2 show a conventional water heater and its control diagram.
In FIG. 2, when an outlet 1 is connected to a power source, a transformer 2 provides the voltage necessary to control the appliance.

In FIG. 1, when the flow switch 3 is turned on, the main controller 15 opens the first control valve 4, and at the same time, the ignition flag 5 is discharged. The gas comes out from the fuel tank 9-6 and the pilot light is lit by the ignition flag 5. The thermocouple detects this pilot flame and the main controller 1
5 opens the secondary control valve 8. The gas passes through the gas governor 9 and the secondary control valve 8 and is sent to the burner 10, where it ignites the pilot flame and ignites the main burner. The above is a simple explanation up to ignition, but even though the gas is sent to the primary control valve 4, it is necessary to bleed air from the gas piping at the time of equipment installation test run. When performing this air removal, it takes 30 minutes to an hour to go from the steamer to the steamer, and the work efficiency is poor. Also, connecting gas directly to the main burner is dangerous as it may cause a backfire or explosion.

The purpose of this invention is to shorten the time required for air venting by opening and closing the secondary control valve at a certain time, and furthermore to prevent backfire and explosion ignition.

This invention will be explained with reference to the drawings. In FIG. 3, by connecting the outlet 1 to the power source, the voltage necessary for control can be obtained from the I lance 2. When the flow switch 3 is turned on, the controller ], l starts operating. When the flow switch 3 is turned on, the primary control valve 4 is opened via the controller 11 and gas is guided to the pilot pipe. At this point, the spark plug 5 is discharging, but immediately -1?
If the ilot burner does not ignite, press the air vent switch 1.
Turn on 2. From this, the timer circuit 1 is connected to the controller 11.
3 will be linked. This timer circuit 13 also includes a function to open and close the secondary control valve 8, and opens and closes the secondary control valve at an arbitrary time. By venting air from the main burner in this way, the time required to bleed the air is considerably shortened, and it is also possible to prevent disadvantages such as explosive ignition and backfire that would occur if the main burner was connected directly. - As an example, assume that the secondary control valve is closed for 5 seconds and opened for only 1 second. The area ratio between the pilot burner and the main burner is generally 200, so if we assume that it takes 30 minutes to bleed air from the Noquilosotopana, it would be about 9 if we consider the example above. , and the raw gas is released from the main burner for only one second, so the above-mentioned disadvantages are unlikely to occur4.As explained above, this invention allows the secondary control valve to be opened for a short period of time. This has the effect of greatly shortening the time required for air venting, and also reducing the risk of explosions and ignitions and backfires that would otherwise occur when air is vented by leaving it open all the time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional water heater, FIG. 2 is an explanatory diagram of a conventional control, and FIG. 3 is a diagram in which the present invention is applied to a water heater. 1...Outlet, 2...Transformer, 3...Flow switch, 4...Primary control valve, 5...Spark plug,
6...Pilot burner, 7...Thermocouple, 8...
Secondary control valve, 9... gas governor, 10 - burner,
11... Controller, 12... Air vent switch, 13
- Timer circuit, 14... Ignition transformer, 15 - Main controller. Figure 1 To Figure 2 Figure 3

Claims (1)

[Claims] - An air vent switch is provided in a gas appliance having a burner and a main burner. This air venting device for a gas appliance is characterized in that when it is turned on, the pilot burner and the discharge lance are always open, and the main burner is intermittently turned off.