JPS6034916Y2 - Combustion safety device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a combustion safety device that operates reliably not only when combustion goes out, but also when abnormal combustion occurs due to lack of oxygen.

Conventionally, a thermocouple is heated by a pilot burner provided when the main burner is ignited, and a thermoelectromotive force generated thereby is used to maintain the open state of the solenoid valve.

This safety measure can be activated not only when the pilot burner goes out due to wind, but also when abnormal combustion occurs due to lack of oxygen.

For example, a configuration may be considered in which the shape of the pilot burner's flame opening is devised to cause the flame to bulge in an oxygen-deficient state, and the thermocouple is removed from the heating area of the flame.

However, since the thermocouple is located close to the main burner as well as the pilot burner, even if the pilot burner is out of the heating range of the flame due to lack of oxygen, it will continue to be heated by the main burner, resulting in a constant electromotive force. There was a problem with keeping it.

Therefore, until the oxygen deficiency progresses and the main burner is extinguished, a large amount of carbon monoxide gas is generated.

The present invention solves these conventional drawbacks, and embodiments thereof will be described below with reference to the accompanying drawings.

In Figures 1 and 2, 1 is a pilot burner with a single flame port 2 formed at its tip. Under normal conditions, it is in close contact with the flame port 2 to form a pilot flame A, and in an oxygen-deficient state, the pilot flame A is formed immediately. The pilot flame A is intended to cause lifting.

Reference numeral 3 designates a thermocouple which is heated by the combustion heat of the pilot flame A when it is in a normal state, generates a thermoelectromotive force, and holds an electromagnetic valve in the gas circuit open.

4 is a main burner ignited by pilot burner 1; 5 is flame B of main burner 4 and thermocouple 3;
The heat shield interposed between the two blocks the radiant heat radiated from the flame B to the thermocouple 3, and does not prevent the pilot burner 1 from igniting the main burner 4. The outer periphery excluding the portion facing the burner is provided as a ventilation gap.

For example, only the portion corresponding to the thermocouple 3 is made convex so that the pilot flame can be transferred to the main burner through the cutout portions located on both sides of the convex portion of the convex heat shield.

In the above configuration, the thermocouple 3 is not affected by the thermal influence of the main burner 4 due to the action of the heat shield 5. Therefore, if the flame A of the pilot burner 1 causes lifting in the early stage of oxygen deficiency, the thermocouple 4 The thermoelectromotive force decreases, the solenoid valve is closed, and the subsequent gas supply to the pilot and main burners 1 and 4 is stopped.

According to the above configuration, the heat shield 5 can be installed regardless of the ignitability of the main burner 4, and the heat shield effect can be further enhanced.

Furthermore, if the thermocouple 3 is surrounded by a part of the heat shield 5 as shown in FIG. 4, and air is caused to flow between them by convection, the thermocouple 3 can be closed when the pilot burner 1 is lifted. By cooling and hastening the drop in electromotive force, the solenoid valve can be closed quickly.

As explained above, the present invention provides a ventilation gap between the thermocouple and the heat shield to help cool the thermocouple in the event of oxygen deficiency, and also forms one pilot burner flame to prevent the heat shield from passing through the heat shield. By making the thermocouple have a convex part that shields only the thermocouple from heat, it is possible to easily transfer the flame from the notches on both sides of the convex part to the main burner. The thermocouple is not exposed to radiant heat, and the thermoelectromotive force is quickly lowered, ensuring safe operation due to lack of oxygen.

It is possible to provide a device with high practical value that can accurately perform safe operations against abnormal combustion and prevent accidents such as carbon monoxide gas poisoning.

[Brief explanation of the drawing]

FIG. 1 is a front view of a combustion safety device showing an embodiment of the present invention;
2 is a view taken along the line X--X in FIG. 1, and FIG. 3 is a perspective view of another embodiment of the heat shield. 1...Pilot burner, 2 at 2 b
... Flame mouth, 3 ... Thermocouple, 4
...Main burner, 5...Heat shield.

Claims (1)

[Scope of utility model registration request] A pilot burner provided near the main burner, and a thermocouple that is heated by one flame formed by the pilot burner and generates a thermoelectromotive force for safe operation, and is opposed to the pilot burner of the thermocouple. A combustion safety device that has a ventilation gap around the outer periphery except for the thermocouple, and a heat shield that is convex only at the part corresponding to the thermocouple.