JPS58200927A - Safety device for combustion - Google Patents

Abstract

PURPOSE:To enable the production of a high electromotive force and to improve spreading of a flame when firing and a gas exhausting performance during a normal combustion, by insuring the introduction of combustion gas and the air which flow in the front and the rear of a sensor. CONSTITUTION:When a main burner 1 is brought to an imperfect combustion state due to oxygen deficiency, etc., a flame extends to close a window 8, which results in checking the flow of the air 15 into a combustion gas passage 6. As a result, the electrode 2b side is brought to an oxygen deficiency state and a difference in an oxygen concentration between two electrodes 2b and 2c is produced, whereby an electromotive force is generated in a sensor 2. If the electromotive force exceeds a predetermined set value, a controller 12 actuates to feed a closing instruction to a safety valve 13, and the safety valve 13 is closed to shut off a fuel feed to the main burner 1. This permits increasing of the electromotive force of the sensor, and enables the stabilization of a device.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a combustion safety device that has been used in gas combustors and the like, and has recently developed a sensor that generates an activation force according to a difference in molten concentration. This relates to a combustion environment safety device (TFT) that detects an incomplete combustion state and automatically (stops) the supply of fuel.

[Technical background of the invention] Gas combustors are widely used in various fields, but they are used for long periods in closed rooms with insufficient ventilation,
If the primary air suction part of the heater is blocked with dust etc., if you rub it,
Incomplete combustion or misfire may occur, leading to carbon oxide poisoning or explosion due to light control gas.

To prevent such accidents, there is already a combustion safety device in which a sensor that generates an electromotive force is installed at the burner flame cutting surface IN, and the electromotive force automatically controls the fuel supply valve. Proposed.

In this conventional device, when the burner is in a normal combustion state, both electrode surfaces of the sensor are located in an atmosphere with a high oxygen concentration, whereas during incomplete combustion, only one electrode surface is stirred by the flame and oxygen is deficient. It is in a position where it becomes a state. Therefore, the sensor does not produce an output during normal combustion, but produces a large electromotive force during incomplete combustion, which acts to close the safety valve.

[Problems with background technology]

The above-mentioned background technology has the drawback that convection occurs around the sensor due to the heat from the nozzle, which causes turbulence in the atmosphere during normal and incomplete combustion, which tends to cause malfunctions. In addition, if the atmospheric sensor was surrounded by a box-shaped container, there was a risk that it would have a negative effect on the ignition during ignition and on the exhaust gas performance under normal conditions.

[Purpose of the invention]

Therefore, the purpose of the present invention is to ensure the introduction of combustion gas and air after the sensor so that a large electromotive force can be obtained, and also to improve the flame transfer during ignition and the exhaust gas performance during normal combustion. An object of the present invention is to provide a combustion safety device according to the above.

[Summary of the invention]

The combustion safety device of the present invention includes a holder that is attached to the front of the main 7-ner, and is housed in a cylindrical portion of this holder that has a curved surface, so that the inside of the cylindrical portion is connected to a combustion gas flow path and a convection air flow path. The electromotive force of the partitioning sensor, the window formed in the cylindrical part located between the mound a and the 7th corner of this sensor, and the 1llllI sensor is a predetermined 1fL'ai.
It consists of a control device that closes the safety valve when the limit is exceeded.

[Embodiments of the invention]

Embodiments of the combustion safety device according to the present invention will be described below with reference to the drawings.

In Fig. 1, the main nozzle 9-1 of the combustor has a large number of flame holes Y (consisting of 4 ceramic plates, in front of which sensors 2 are arranged at a predetermined distance C7), and the sensors 2 It is held by 3. The upper self-sensor 2 uses a plate 2 that dissolves solids such as zirconium oxide.
Porous electrodes 2b and 2'lc are adhered to both sides of a.

On the other hand, as clearly shown in FIG. 2, the holder 3 has a mounting bracket 4 fixed to the lower end of a cylinder 3a having a curved surface such as a cylinder or a flat cylinder. A screw hole 4c is provided in the flat mounting surface 4m of the bracket 4, so that it can be fixed to the support frame 5 of the main nosena 1 using screws.

A plate body 2a of the sensor 2 is housed within a cylindrical body 3a, and divides the inside of the cylindrical body into a combustion gas passage 6 and a convection air passage 7. Also, the electrode 2b of the sensor 2 is located on the cylinder wall of the cylinder 3a.
A window 8 is bored at a position where the two face each other.

The sensor 2 housed in the cylinder 3a FF3 is pressed by a leaf spring 9 from the convection air flow path 7m, and the lower side of the window 81 of the combustion gas flow path 6 is filled with a heat insulating material 10.

The lead wires 11a and llb drawn out from the electrodes 2b and 2c of the sensor 2 are connected to a control circuit 12, and when the electromotive force of the sensor 2 exceeds a predetermined set value, the control circuit 12 turns a safety valve 131c to close it. When the command is issued, the safety valve 13 is configured to perform a closing operation and stop the fuel supply to the main port 1.

In the combustion safety device of the present invention configured as described above, the main/? - If fuel 1 is completely combusted, flame 1
4 is short, a part of the air 15 rising between the main/nozzle 1 and the cylinder 3a flows into the combustion gas passage 6 through the window 8 and supplies the electrode 2b with a charge.

On the other hand, T[mZcIC is the air 1 flowing in from the through hole 16a provided in the ti 116 fixed on the mounting bracket
7 rises in the convective air path 7 due to convection, there is no difference in oxygen concentration between the electrodes 2b and 2c, and the sensor 2 does not generate an electromotive force.

On the other hand, if the main fuel tank 1 becomes incompletely combusted due to lack of oxygen or the like, the flame will extend and block the window 8, so that the air 15 will be prevented from directly entering the combustion gas flow path 6. As a result, the 'llllb side becomes oxygen deficient, and both II and others 2b,
Since a difference in oxygen concentration occurs between 2C, an electromotive force is generated in the sensor 2. When this starting force exceeds a preset value, the control device 12 operates and sends a closing command to the safety valve 13, which closes and stops the fuel supply to the main burner 1.

〔Effect of the invention〕

As is clear from the above explanation, according to the combustion safety device of the present invention, since the sensor is arranged inside the curved cylinder provided with the window, the rectification of the atmospheric gas is performed smoothly, and the ignition There is no risk of flame transfer over time, normal combustion, or deterioration of exhaust gas performance during dawn. Additionally, since the sensor is inserted between the leaf spring and the insulation material, it is effectively protected from side forces when it falls.

As described above, according to the present invention, the electromotive force generated by the sensor during incomplete combustion is large (and low-voltage), so when incomplete combustion occurs, it is immediately detected and the safety valve is closed. This makes it possible to improve safety.Furthermore, it is possible to obtain a combustion safety device that has a simple structure and has an excellent sensor protection function.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a commercially available example of the combustion safety device of the present invention, and FIG. 2 is a perspective view showing an example of a sensor used in the present invention and a holder containing the sensor. 1... Main burner, 2... Sensor %2a...
・Plate, 2b, 2C...[Pole, 3...Holder, 3
m... Cylindrical body, 5... Support frame, 6... Combustion gas flow path, 7... Convection air flow path, 8... Window, 9... Leaf spring, 10... Heat insulation material, 12... control circuit, 13...
safety valve.

Claims (1)

[Claims] 1. A cylindrical σ) holder attached to the front surface of the main burner, and a cylindrical holder housed in the cylinder of the holder, which connects the inside of the cylinder to the combustion gas flow path and convection air FL'#! When the electromotive force of the sensor exceeds 1 shift, A combustion safety device that includes a control device that closes a safety valve and a control device that closes a safety valve. 2. The upper sensor is housed in the holder and is inserted between the heat insulating material placed on the side of the combustion gas flow path below the mount and the convection air flow path 1i4 [provided with 1 leaf spring. The combustion safety device described in Section 1, V