JPS6016854Y2 - Combustion control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a combustion control device using a solid electrolyte material as a sensor.

A solid electrolyte material such as stable zirconia is formed into a plate shape to serve as a sensor, and platinum or the like is pasted on both sides as electrodes. Voltage is generated.

Therefore, by bringing the combustion flame close to one electrode surface and reducing the oxygen concentration in the atmosphere near this electrode surface, the combustion supply valve for the combustion flame can be kept open by the voltage at that time. Also, when the oxygen concentration in the combustion air for the combustion flame decreases, resulting in a so-called oxygen-deficient state, the combustion flame causes a lifting phenomenon and the elongated flame reduces the oxygen concentration in the atmosphere near the other electrode surface. Alternatively, the inner flame of the flame increases the oxygen concentration in the vicinity of one electrode surface, and the difference in oxygen concentration between the two electrode surfaces is reduced. At that time, the electromotive force decreases and the fuel supply valve can be closed.

On the other hand, such a sensor has the property of decreasing internal resistance and increasing electromotive voltage when heated, and for this reason, it is desirable to heat the sensor quickly in order to improve the rising characteristics of electromotive voltage.

Furthermore, in order to obtain a stable and sufficient electromotive force, it is necessary to maintain the high temperature state.

The present invention has been developed in view of the above points, and embodiments thereof will be described below with reference to the drawings.

1 is a gas burner with a flame hole in the upper part that forms combustion flame 2 upward; 3 is a solenoid valve that is disposed in the gas supply path to burner 1 and is temporarily pushed open; 4 is this solenoid valve. It is a flat sensor made of solid electrolyte material that provides electrical force to keep the valve open.

Here, this sensor 4 has electrodes 5 and 6 made of platinum or the like affixed to its upper and lower surfaces, and the both poles 5 and 6 are electrically connected to the electromagnetic valve 3, and its lower surface is connected to the combustion flame of the gas burner 1. 2... Contact with external flame.

or placed directly above the external flame in its combustion atmosphere.

Reference numeral 7 denotes a heat-retaining plate made of a heat-resistant material that is attached to the upper surface of the sensor 4 in close contact with each other so as to overlap with each other. , and its circumferential edge extends largely from the circumferential edge of the sensor 4 .

Note that 9 is a primary air supply hole of the burner 1.

Thus, the solenoid valve 3 is temporarily pushed open to supply gas to the gas burner 1, and the burner 1 is ignited and burned by a suitable ignition means.

Then, the combustion flames 2 heat the lower surface side of the sensor 4, and the outer flames of the combustion flames 2 lower the oxygen concentration in the atmosphere on the lower surface side.

Therefore, the sensor 1 lowers the internal resistance and also generates a voltage due to the difference in oxygen concentration and applies it to the solenoid valve 3 to keep the device open.

At this time, the heat-retaining plate 7 has a large heat capacity, so it keeps the heated sensor 4 warm and further maintains it at a high temperature.

Therefore, since the sensor 4 has little temperature change, a stable voltage is generated.

Furthermore, the heat insulation board 7 has small through holes 8 on the upper surface side of the sensor 4.
etc. to ensure smooth oxygen supply.

In addition, since this heat-insulating plate 7 protrudes from the peripheral edge of the part of the sensor 4 that is hit by the combustion flames 2, the combustion flames 2... instantaneously move toward the upper surface of the sensor 4 due to changes in gas supply pressure, etc. Even if it tries to extend to the upper surface side of the sensor 4, it cannot completely wrap around the upper surface side of the sensor 4, and the oxygen concentration on the upper surface side does not change much.
The generated voltage is also maintained stably, and the combustion flame 2 hits the overhanging portion of the heat-insulating plate 7, and the upper surface side of the sensor 4 is heated by heat transfer, so that the sensor 4 generates a voltage with a good rise.

Here, when the chamber in which the gas burner 1 is placed becomes oxygen-deficient, the outer flame of the combustion flame 2 inevitably causes a lifting phenomenon and wraps around the upper surface side of the sensor 4, and this continues. The inner flame with a relatively high oxygen concentration hits the lower surface side of the sensor 4.

Therefore, the difference in oxygen concentration in the atmosphere between the upper and lower surfaces of the sensor 4 decreases at once, and the sensor 4 lowers the generated voltage, so the solenoid valve 3 loses the force to keep it open and closes, and the burner 1 also closes. extinguish a fire.

As described above, the combustion control device according to the present invention has a heat insulating plate that has ventilation and heat resistance and is attached to the surface of the flat sensor made of solid electrolyte material that does not directly face the combustion flame and extends from the part that is exposed to the combustion flame. Due to its heat capacity, the sensor can be kept in a high temperature state, and the fuel supply valve can be stably kept open by the sensor.

In addition, the air permeability of the heat insulating plate allows the non-opposed surface of the sensor to be constantly supplied with oxygen, maintaining a high oxygen concentration, and generating a large voltage by maintaining a sufficient oxygen concentration difference with the surface facing the combustion flame. be able to.

Furthermore, since the heat insulating plate is attached to the surface of the sensor that does not directly face the combustion flame and extends beyond the part that is hit by the combustion flame, the combustion flame also hits the overhanging part of the heat insulating plate, improving the rise characteristics of the sensor through heat transfer. .

[Brief explanation of the drawing]

FIG. 1 is a front view of a combustion control device according to the present invention, FIG. 2 is a side view, and FIG. 3 is a perspective view of a heat retaining plate. 1...Gas burner, 2...Combustion flame, 3
...Solenoid valve, 4...Sensor, 7...
...warm plate.

Claims (1)

[Scope of utility model registration request] One side of the sensor, which is made of solid electrolyte material, faces the combustion atmosphere of the burner combustion flame, and a heat insulating plate with ventilation is attached to the other side of the sensor, overhanging the part that is exposed to the combustion flame, in close contact with the sensor. A combustion control device that uses electromotive force to keep open a solenoid valve for supplying fuel to a burner.