JPS6210592Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a combustion safety device that detects incomplete combustion of the burner due to lack of oxygen in the indoor air, misfire of the burner due to blowout, etc., and stops the supply of gas.

Originally, in this type of device, in front of a main burner such as a gas infrared burner, there was a pilot burner for constant fire, and one lamp facing the pilot burner and the main burner.
The general method is to arrange an oxygen concentration battery element having a pair of electrodes and control the operation of a safety valve by the output of the element. is the electromotive force of the oxygen concentration battery element that is constantly exposed to an atmosphere with a low oxygen concentration due to a pilot flame, and is generated depending on the difference between the oxygen concentration and the oxygen concentration in the main burner flame or its exhaust gas that acts on the other electrode. This keeps the safety valve open, and when the oxygen concentration in the main burner flame and exhaust gas decreases due to incomplete combustion in the main burner, the electromotive force is lost due to the decrease in the oxygen concentration difference between the two electrodes, and the safety valve closes. However, in this case, when the starter flame is agitated by wind, etc., indoor air comes into contact with one of the electrodes, as in the case of a misfire, and the difference in oxygen concentration between the two electrodes increases due to the increase in the oxygen concentration of the electrode. This decrease causes the electromotive force of the element to be lost, resulting in the inconvenience of closing the safety valve.

Conventionally, in order to eliminate this inconvenience, the pilot burner and the oxygen concentration battery element are housed in a cover body that has an opening at the back and an opening at the top facing the main burner, thereby preventing the influence of wind, etc. as much as possible. There is also a known device with a similar structure, but since the supply of secondary air into the cover body is obstructed, flames tend to lift up to the outside of the opening at the top of the cover body, causing the element to start up. The safety valve is likely to malfunction due to a drop in power, and since the element is housed in the cover body, it is not possible to heat the element with an ignition burner on the side; This has the disadvantage that the preheating time required is long.

The object of the present invention is to provide an apparatus that eliminates such inconveniences, and has an opening 2 at the back and an opening 3 at the top in front of a main burner 1 such as a gas infrared burner. A pilot burner 5 for regular fire is housed in the cover body 4, and an oxygen concentration battery element 7 having a pair of electrodes 6, 6 facing the pilot burner 5 and the main burner 1, respectively, is disposed, In the type in which the operation of the safety valve is controlled by the output of the element 7, the element 7 has a size that almost closes the opening 2, and the side plate 4 of the cover body 4.
The ignition burner 8 faces the outside of the ignition burner 8, and at least the side plate portion 4a on the side facing the ignition burner 8 is connected to the main burner 1.
At the same time, the side plate portion 4a is located at a position in the lower half of the side plate portion 4a that is forward of the front surface position of the electrode 6 on the side opposite to the pilot burner 5 and that is in the range where the flame of the ignition burner 8 hits. , the ignition burner 8
A through hole 9 is provided with a size that allows the flame to reach the pilot burner 5 with its strength and that the flame of the pilot burner 5 is not swayed by wind from the outside.

The oxygen concentration battery element 7 is made of a sintered body of an oxygen ion conductive solid electrolyte such as zirconia.
By heating to a predetermined operating temperature, an electromotive force corresponding to the difference in oxygen concentration between the pair of front and back electrodes 6, 6 is generated due to a decrease in internal resistance.

The cover body 4 has a side plate portion 4a facing the ignition burner 8 extended toward the main burner 1 side as shown in the second figure.
The ignition flame is prevented from going around to the electrode 6 of the oxygen concentration battery element 7 facing the main burner 1.

In addition to the side plate part 4a, the through holes 9 can be formed in the other side plate part 4a as shown in the third figure, and the pilot burner 5 is provided with a plurality of flame ports, and the oxygen concentration battery element 7 is also formed. It is also possible to provide a plurality of separate units to stabilize the output.

Next, to explain its operation, when the ignition burner 8 is ignited by the ignition operation, the ignition flame is introduced into the cover body 4 through the through hole 9 of the side plate portion 4a facing the ignition burner 5, and the ignition burner 5 is ignited. Following the ignition, the oxygen concentration battery element 7 is heated by the starter flame and the ignition flame.

Here, since the ignition flame is formed into an incomplete combustion flame with a large amount of gas ejected, a large oxygen concentration difference occurs between the electrode 6 exposed to the starter flame and the ignition flame and the electrode 6 on the main burner 1 side. , thus the oxygen concentration battery element 7
When the safety valve is heated to a predetermined operating temperature, an electromotive force is immediately generated to keep the safety valve open.

In this case, when the ignition flame goes around to the electrode 6 on the main burner 1 side, the difference in oxygen concentration between the two electrodes 6, 6 decreases, and no electromotive force is generated even when the element 7 is heated to the operating temperature. , Thus, after the ignition operation is completed, the main burner 1
A means is required to forcibly keep the safety valve open until the oxygen concentration of the side electrode 6 increases to the normal value due to the main burner flame, but as described above, the side plate portion 4a
If the ignition flame is extended to prevent the ignition flame from wrapping around, such inconvenience will not occur.

After the ignition operation is completed, an appropriate amount of secondary air is supplied into the cover body 4 through the through hole 9, and the flame is suppressed by the effects of wind within the cover body 4 as much as possible without causing lift-up. This prevents stable combustion, ensures that the electrode 6 facing the pilot burner 5 is maintained in a low oxygen concentration atmosphere, and prevents the oxygen concentration battery element 7 and the safety valve from malfunctioning.

According to the present invention, the element 7 is sized to almost close the opening 2, and the ignition burner 8 is placed on the outside of the side plate 4a of the cover body 4.
At least the side plate portion 4a on the side facing the ignition burner 8
is extended to the main burner 1, and the side plate portion 4a
The ignition burner 8 is located at a position in front of the front surface of the electrode 6 on the side facing the ignition burner 5, and the ignition burner 8
The flame of the ignition burner 8 can reach the pilot burner 5 with its flame force at the lower half position of the side plate portion 4a in the range where the flame hits, and the flame of the pilot burner 5 is not swayed by wind from the outside. Since a through hole 9 of a certain size is provided, the bottomed cover body 4 has an opening 2 at the back and an opening 3 at the top, and the opening 2 is almost closed by the element 7. Even in the case where a pilot burner 5 for normal combustion is disposed inside a certain cover body 4, the flame of the ignition burner 8 is introduced into the cover body 4 through the through hole 9, and the oxygen concentration battery element 7 is heated. Heating can be achieved quickly, and when the ignition flame of the ignition burner 8 is introduced into the cover body 4 through the through hole 9, the through hole 9 is covered with the flame of the ignition burner 8, and from now on, almost no air Since there is no supply of air, ignition is carried out in a state where the fuel gas concentration is high and flame transfer is likely to occur, and after the ignition operation is completed, secondary air is supplied from the outside through the through hole 9 of the size described above. There is no inconvenience such as the flame of the pilot burner 5 for regular fire fluctuating due to the wind, and after the ignition operation is completed, secondary air is supplied into the cover body 4 through the through hole 9, and the pilot burner 5 is heated. The lift-up of the flame in No. 5 is prevented, and the above-mentioned disadvantages of the conventional method can be reliably overcome.

[Brief explanation of the drawing]

FIG. 1 is a front view of one example of the device of the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a perspective view of main parts showing another embodiment. DESCRIPTION OF SYMBOLS 1...Main burner, 2...Back opening, 3...Top opening, 4...Cover body, 4a...Side plate part, 5
... Pilot burner for constant fire, 6 ... Electrode, 7 ... Oxygen concentration battery element, 8 ... Ignition burner, 9 ... Through hole.

Claims (1)

[Scope of utility model registration request] Gas infrared burners and other main burners 1 have an opening 2 at the back and an opening 3 at the top opposite to the front side of the main burner 1.
In the cover body 4 having
and an oxygen concentration battery element 7 having an electrode 6 facing the pilot burner 5 and the main burner 1, and the operation of the safety valve is controlled by the output of the element 7. The opening 2 is made large enough to almost close the opening 2, and the ignition burner 8 is made to face the outside of the side plate portion 4a of the cover body 4, and at least the side plate portion 4a on the side facing the ignition burner 8 is extended to the main burner 1. At the same time, the side plate portion 4a is located in front of the front surface of the electrode 6 on the side opposite to the ignition burner 5, and in a range where the flame of the ignition burner 8 hits.
At the lower half position of a, there is a through hole 9 having a size that allows the flame of the ignition burner 8 to reach the pilot burner 5 with flame force and that the flame of the pilot burner 5 is not shaken by wind from the outside. A combustion safety device comprising: