JPS6252218B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire extinguishing device for a burner used in a grain dryer or the like.

In conventional grain dryer burner fire extinguishing systems, the sensing part of the fire extinguishing system operates when the lower outer periphery of the burner starts to burn, or when the upper surface of the burner fixing plate to which the burner is attached is activated. It was activated when the fire started. However, these conventional devices have the disadvantage that the sensing section does not operate unless the portion of the combustion chamber saucer inside the burner burns considerably, and the sensing operation is not sensitive.

The present invention aims to eliminate such drawbacks, and embodiments of the present invention shown in the drawings will be described below.

First, the configuration of the invention will be explained.

Reference numeral 1 denotes a grain dryer, and the grain dryer 1 includes a storage tank 2 at the top, a drying chamber section 3 that applies hot air from the side to the grains flowing down from the storage tank 2 to dry the grains, and a drying chamber section 3. It consists of a grain collection chamber 4 that collects grains fed out from the grain collection chamber 4, and the grains collected at the bottom of the grain collection chamber 4 are taken out to one side by a lower helical transfer device (not shown). ,
It is transported upward by an elevator 5, and further circulated through an upper helical transfer device 6 to an upper storage tank 2, where it is dried.

Next, to explain the part of the burner 7 that is the source of hot air, 8 is a burner box attached to the side of the drying chamber 3 of the grain dryer 1. has been set up. To explain this burner 7 specifically, a combustion tray 11 is placed on a combustion chamber saucer 10 having an inlet 9 for primary air.
1, a combustion body 12 is polymerized in the combustion chamber 10, and an oil supply pipe 13 standing upright in the center of the combustion chamber 11 is configured to cause the fuel to flow down onto the combustion chamber 11 for vaporization and combustion. opens the primary air inlet 9, and an asbestos ignition cloth 14 is placed on the bottom of the combustion chamber saucer 10, and the downwardly bent end of the presser rod 15 is attached radially to the central oil supply pipe 13. The asbestos ignition cloth 15 is pressed at the part. The combustion plate 11 and the combustion body 12 are provided with a large number of ventilation holes (the ventilation holes of the combustion body 12 are omitted from the drawing), and a combustion chamber 15 is formed above the combustion body 12. The secondary air inlet 16 is opened, and a hot air diffusion tube 18 is connected to the opening 17 of the combustion chamber 15.

Reference numeral 19 denotes a sensing portion for sensing the temperature for operating the fire extinguisher, which is disposed at the upper part of the entrance side of the combustion chamber saucer 10 and on the lateral side.A sensing portion cover 21 for heat insulation is provided around the sensing portion 19. has been set up. The sensing part cover 21 allows air entering from the primary air inlet 9 to pass around the sensing part 19 and reach the combustion plate 11.
Openings are formed at the front and rear so that the flow flows in the direction of An inclined surface part 21a that is sloped higher toward the rear side (left side in FIG. 3) and gradually lower toward the rear side (right side in FIG. 3).
The sensing part 19 is cooled by the air that enters from the primary air inlet 9 and flows inside the sensing part cover 21, and the air that enters from the primary air inlet 9 and flows along the lower surface of the inclined surface part 21a of the sensing part cover 21 cools the sensing part 19. The wind flowing along the slope is guided by the inclined surface portion 21a and has a flow velocity higher than that of the wind passing through the lower part of the combustion chamber tray 10, creating a state similar to an air curtain, and the hot air generated in a normal combustion state is directed to the sensing portion 19. It is configured in such a way that it is difficult to reach. In addition, 22 is a wind control valve, 23 is a heater for ignition, and 24 is a heater cover. 25 is a fire extinguishing tank of the fire extinguisher, and when the fusible link forming the sensing part 19 reaches about 72 degrees Celsius, the joint of the fusible link melts and the fire extinguisher is activated via the wire 26. The carbon dioxide gas in the fire extinguishing tank 25 is supplied through a gas introduction pipe (not shown) to the combustion chamber saucer 10 or a drain tray (not shown) that burns well, thereby extinguishing the fire.

Next, the effect will be explained. When burning the burner 7, when the asbestos ignition cloth 14 is moistened with ignition fuel introduced from the ignition pipe 30 and heated by the heater 23, the fuel near the heater 23 is heated, evaporated, and ignited. The fire gradually spreads throughout the asbestos ignition cloth 14 and heats the combustion pan 11, and when fuel is supplied to the combustion pan 11 from the oil supply pipe 13, the fuel spreads over the entire surface of the combustion pan 11 and is vaporized and burned. The upper combustion body 12 is heated. Then, complete combustion occurs in the combustion chamber 15 when secondary air is supplied, and the air is heated to a high temperature. Then, the air is turned into hot air by the suction force of the suction fan 27, and the hot air diffuser 1
It flows into the drying chamber 3 through the interior of the grain 8, acts to dry the grain, and is discharged outside the machine.

In this way, during the ignition operation of the burner 7, the temperature of the sensing part 19 is prevented from increasing by the sensing cover 21, and when the burner 7 is in a normal combustion state, the primary air entering the combustion chamber receiving tray 10 , the sensing part 19 of the fire extinguisher is cooled, and
The temperature rise is prevented by the sensing part cover 21, and the sensing part 19 will not be activated.

If a fire occurs in the burner 7 section,
Normally, a fire first occurs within the combustion chamber saucer 10 and then spreads around the burner 7 after a while. Therefore, in the case of a conventional device in which the sensing section is disposed on the lower outer periphery of the burner 7 (the outer periphery of the combustion chamber saucer 10) or on the upper part of the burner fixing plate 28 that closes the upper part of the combustion chamber saucer 10. However, after a fire occurs inside the burner 7, it takes time for the fire to spread to these parts, so there was a problem that the activation of the fire extinguisher's sensing part was delayed.

However, in this invention, the combustion chamber saucer 10
Since a sensing part 19 is disposed inside the interior of the combustion chamber to detect the temperature for operating the fire extinguisher, if a fire occurs inside the combustion chamber saucer 10 and the temperature rises abnormally, the combustion chamber saucer 10
The sensing part 19 that detects the temperature before the fire spreads from inside to other parts is activated, and the carbon dioxide gas in the fire extinguishing tank 25 of the fire extinguisher is discharged through the gas introduction pipe (not shown) to quickly extinguish the fire. It is something that can be done.

This invention includes a combustion section 11 placed on a combustion chamber tray 10 serving as an air inlet path for combustion, and a sensing section 19 and an ignition device 23 inside the combustion chamber tray 10 for sensing the temperature for operating a fire extinguisher. and the sensing section 1
Since this is a burner fire extinguishing device in which a sensing part cover 21 for insulation is interposed between the burner 7 and the ignition device 23, when a fire occurs in the burner part, the inside of the combustion chamber saucer 10, which is the inside of the burner 7, is Due to the fire at
The fire extinguisher can be extinguished quickly, and when the ignition device 23 is activated, the sensing portion cover 21 prevents the sensing portion 1 from operating the fire extinguisher due to the heat insulating effect of the sensing portion cover 21.
9 does not operate, and smooth ignition can be achieved.

[Brief explanation of the drawing]

The drawings show embodiments of the invention.
The figures are a side view, FIG. 2 is a front view, FIG. 3 is a cutaway side view, FIG. 4 is a front view, and FIG. 5 is a plan view. Explanation of symbols 1... Grain dryer, 7... Burner, 8... Burner box, 9... Primary air inlet, 10... Combustion chamber saucer, 11... Combustion pan (combustion part), 12... Combustion body (combustion part), 13...oil supply pipe, 19...sensing part of fire extinguisher, 21...sensing part cover, 23... heater for ignition (ignition device),
25...Fire extinguisher tank.

Claims (1)

[Claims] 1. The combustion part 11 is placed on a combustion chamber saucer 10 which serves as an air inlet path for combustion, and a sensing part 19 for sensing the temperature for operating the fire extinguisher and an ignition device 23 are arranged in the combustion chamber saucer 10. , a fire extinguishing system for a burner, in which a sensing part cover 21 for heat insulation is interposed between the sensing part 19 and the igniter 23.