JPS6115401Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for a combustor using a solid electrolyte material as a sensor, and is particularly aimed at allowing the burner body to be used for different types of fuel gas.

The safety device for this type of combustor consists of a sensor formed by forming a solid electrolyte material such as stabilized zirconia into a plate shape, and contains unburned gas and intermediate products during normal combustion of the one-sided pilot burner of this sensor. The combustion flame (inside the outer flame) is brought into contact and heated, and an oxygen partial pressure difference is created between both sides of the sensor to generate an electromotive force.This electromotive force is supplied to the solenoid valve, which controls the gas passage. is held open. Utilizing the lift phenomenon of the combustion flame due to a decrease in the oxygen concentration in the atmosphere, the solenoid valve is closed by lowering the oxygen partial pressure difference between the two surfaces of the sensor during lift combustion.

Therefore, when changing the type of fuel gas supplied to the burner, the oxygen concentration in the atmosphere in which the burner starts lift combustion and the lift amount will change, so when closing the solenoid valve at a constant oxygen concentration, In practice, it is necessary to change the flame hole shape of the burner, leading to a problem of high cost.

The present invention has been devised in view of the above points, and embodiments of the present invention will be described below based on the drawings.

1 is a main burner, which has a main flame section 2 on its top surface and an auxiliary flame section 3 on one side thereof. Reference numeral 4 denotes a tubular detection burner that is installed upright facing the auxiliary flame section 3 of the main banner 1, and a plurality of flame holes 5, 5, 5 are arranged in parallel on the peripheral wall facing the auxiliary flame section 3. .

6 is a sensor made of a solid electrolyte material such as stabilized zirconia molded into a plate shape, and is vertically installed between the auxiliary flame section 3 and the detection burner 4, and one side 7 indicates the normal combustion of the detection burner 4. The other surface 8 is arranged so as to be in contact with the outer flame portion containing intermediate products during normal combustion of the main burner 1, and the other surface 8 is also in contact with the hot air flow mixed with air after complete combustion of the auxiliary flame portion 3 during normal combustion of the main burner 1. has been done.

An ignition burner 9 is provided near the main flame section 2 of the main banner 1, and is equipped with an ignition device (not shown) to ignite the main burner 1.

10 is a fuel flow path for supplying fuel to the main burner 1, the detection burner 4, etc., and a gas tank 1 is provided downstream of the solenoid valve 11 electrically connected to the sensor 6.
2, and the ignition burner 9 is installed from this gas stove.
A gas governor 13 is provided downstream of the gas stove 12, and a main burner 1 and a detection burner 4 are provided downstream of the gas governor, and a heat quantity switching valve 14 is inserted between the gas governor 13 and the main burner 1. It consists of

Moreover, FIGS. 2 to 4 show an embodiment of the auxiliary flame section 3 of the main burner 1, and FIG. 2 shows an embodiment of the auxiliary flame section 3 of the main burner 1. The flame hole top 16 is removably inserted into an insertion hole 18 formed in the wall 17 of the auxiliary flame section 3.

On the other hand, in FIG. 3, a spacer 20 is inserted between the flange 19 of the flame hole top 16 and the wall 17 in FIG. 2 to adjust the distance between the sensor 6 and the flame hole top 16.

Furthermore, FIG. 4 shows that several auxiliary flame holes 15, 15, 15 are directly bored in the wall 17 of the auxiliary flame section 3, and a flame hole bush 21 set according to the type of gas to be used is inserted into the auxiliary flame holes 15, 15, 15. 15, 15 in a removable manner.

Then, the gas stove 12 is operated, and in conjunction with this operation, the solenoid valve 11 is opened, and fuel is supplied to the main burner 1, the detection burner 4, and the ignition burner 9, and the ignition burner 9 is set to the ignition burner 9 by an ignition means (not shown). The ignition burner ignites the main burner 1 and the detection burner 4.
ignite it. Then, the sensor 6 is heated by the detection burner 4 and the auxiliary flame section 3 of the main burner 1 to lower its internal resistance, and one side 7 is in contact with the combustion flame containing intermediate products of the detection burner, and the other side 8 is in contact with the sensor 6. When the hot air flow with a relatively high oxygen concentration generated in the auxiliary flame section 3 comes into contact with the sensor 6, a difference in partial pressure of oxygen is generated between the two surfaces of the sensor 6, generating an electromotive force, and this electromotive force is transmitted to the solenoid valve. supply it. Solenoid valve 11
Even if the opening operation linked to the gas tank 12 is released, the internal valve body (not shown) can be maintained in the open state.

On the other hand, when the oxygen concentration in the atmosphere decreases, both the detection burner 4 and the main burner 1 are on the verge of lift combustion, and each combustion flame comes into contact with or approaches the sensor 6, so that the difference in oxygen partial pressure between both sides of the sensor 6 increases. Therefore, the sensor 6 reduces the electromotive force and the solenoid valve 11 shuts off.

Therefore, the oxygen concentration in the atmosphere and the lift amount of the combustion flame are correlated, and the relationship between the lift amount and the electromotive force of the sensor 6 is also determined by the positional relationship between the sensor 6 and the combustion flame. When changing the type of gas, the solenoid valve 11 can be closed at a predetermined oxygen concentration by changing the auxiliary flame section 3 according to the structure shown in FIGS. 2 to 4.

In addition, if the mixing pipe of the main burner 1 is clogged with dust or the like and incomplete combustion occurs, the combustion flame in the auxiliary flame section 3 is elongated and formed, even if the atmosphere has a normal oxygen concentration, as described above. The solenoid valve 11 is closed.

Furthermore, if the type of fuel gas specified by the appliance is different from the type of gas supplied, and when the amount of heat is higher than the specified type, the combustion of the main banner becomes a flame lacking primary air, and the other side 8 of the sensor 6 The partial pressure of oxygen decreases, closing the solenoid valve 11. Conversely, in the case of gas with a low calorific value, the combustion flame of the detection burner 4 becomes shorter and moves away from the sensor 6, so that the oxygen on one side 7 of the sensor 6 decreases. As the partial pressure increases and the partial pressure difference between the two surfaces decreases, the temperature of the sensor 6 decreases, internal resistance increases, and the solenoid valve 11 is closed.

As mentioned above, the combustor safety device according to the present invention has the following features:
A sensor is constructed by forming a solid electrolyte material into a plate shape, and one side of the sensor is in contact with the combustion flame containing intermediate products during normal combustion of the detection burner, and the other side is provided on the side of the main burner. a solenoid valve disposed so as to be in contact with exhaust gas near the combustion flame generated during normal combustion in the auxiliary flame section, and further opening and maintaining a fuel supply path to each of the burners by receiving an electromotive force greater than a set value from the sensor; The shape of the auxiliary flame section is configured to be changeable, and the electromotive force of the sensor is adapted to the type of fuel and the set amount of oxygen concentration. By making the shape changeable, the main burner etc. can be used for different types of gas, and the set value of the oxygen concentration for closing the solenoid valve can be easily adjusted.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing a safety device for a combustor according to the present invention, and FIGS. 2 to 4 are sectional views showing an embodiment of the same essential parts. 1... Main banner, 3... Auxiliary flame section, 4... Detection burner, 6... Sensor, 7... One side, 8... Other side, 11... Solenoid valve.

Claims (1)

[Scope of utility model registration request] A sensor is constructed by forming a solid electrolyte material into a plate shape, and a combustion flame containing intermediate products during normal combustion of a detection burner contacts one side of the sensor.
Further, on the other side, an auxiliary flame part provided on the side of the main banner is arranged so as to be in contact with the exhaust gas near the combustion flame generated during normal combustion, and each of the above-mentioned A solenoid valve is provided to open and maintain the fuel supply path to the banner, and the auxiliary flame section is made detachable so that the shape of the auxiliary flame section can be changed, and the electromotive force of the sensor is adjusted depending on the type of fuel and oxygen concentration. A safety device for a combustor that is characterized by adapting to a set amount.