JPS61202012A - Combustion flame sensor for burner - Google Patents

Abstract

PURPOSE:To always burn a burner in a stabilized condition by feeding combustion air corresponding to the rate of fuel into a burner, by providing a sensor to detect the color and brightness of injecting combustion flames from the burner port of a burner, which is such a type of burner as to inject fuel forward and burn it in front of a burner, and by rotating the sensor around the direction of flames injected. CONSTITUTION:Combustion air to be fed into a burner 1 is sucked from an air suction port 29 by a fan 27 and is fed into an air chamber 13 through an air duct 28. The rate of air is controlled by controlling the revolving number of a blast fan 27 by an air rate controller 30 based on the color and brightness of combustion flames detected by a flame sensor 3. Combustion fuel is fed to the outer surface of a diffusion body from a fuel tank 13 installed in front of a drier 4. The feeding rate of fuel is varied in accordance with the amount of cereal grain being fed in the drier 4 and the atmospheric temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion flame detection device for a burner, and can be used in a dryer for drying grain.

Problems to be Solved by the Invention In a dryer for drying grains, the combustion part of the burner installed at the front of the dryer combusts combustion fuel while spouting it toward the front, and the combustion flame is sent to the rear of the dryer. When drying grains flowing down in the drying chamber by blowing hot air through the drying chamber, the range of the combustion heating temperature of the burner during this drying operation varies depending on the drying temperature. It is required widely depending on the amount of grain, outside temperature, etc. For this reason, the size of the combustion flame ejected from the combustion section of the burner varies depending on the combustion heating temperature, and a flame detection sensor that detects this combustion flame is fixed at a predetermined position. If the color or brightness is detected, the color or brightness of only one location will be detected, which may result in false detection, and this false detection will control the combustion air sent to the burner. If this happens, the combustion air may be erroneously controlled, resulting in poor combustion.

Means for Solving the Problems This invention provides a detection sensor (3) that detects the color or brightness of the combustion flame ejected from the combustion section (2) of a burner (1) that burns fuel while ejecting it forward. A combustion flame detection device for a burner is provided at a position near the front of the combustion section (2) so as to be rotated in the combustion flame jetting direction.

Functions and Effects of the Invention The combustion fuel is ejected forward from the combustion part (2) of the burner (1) and combusted, and is dried by the combustion flame and the outside air passing around the burner (1). The combustion heating temperature range of the burner (1) is wide, and the size of the combustion flame varies depending on the combustion heating temperature.

By rotating a flame detection sensor (3) that detects the color or brightness of the combustion flame at a predetermined time interval in the combustion flame ejection direction at a position near the combustion part (2), the average color of the combustion flame can be determined. , or the brightness of the flame detection sensor (3)
Based on this detection, the combustion air for combustion blown into the burner (1) is controlled, and combustion air is blown in proportion to the amount of combustion fuel to be combusted.

Combustion flame ejected from the combustion section (2) of the burner (1) is detected by the rotating flame detection sensor (3), and combustion air commensurate with the amount of combustion fuel is blown into the burner (1). Therefore, the burner (1) always burns in a stable state.

Embodiment In the illustrated example, the dryer (4) has a burner (1), an operating device (5), a grain raiser (6), etc. at the front, and a blower (7), etc. at the rear. It has a storage chamber (
8) It has a drying chamber (9) in the lower part, and in the lower part of this drying chamber (9) there is provided a pay-out roll (10) for feeding out the grains, and the burner (1) is installed in the front part. Combustion part (2)
and a burner case (1) provided at the front of the dryer (4).
1) It is installed on a support plate (12) fixed to the bottom of the interior, and the hot air generated from the burner (1) and the outside air passing around the burner (1) are connected to the exhaust fan at the rear. (
7), this drying hot air is passed through the drying chamber (9), and the grains flowing down in this drying chamber (9) are exposed to this drying hot air and dried. The configuration is as follows.

The burner (1) has a cylindrical blowing chamber (13) with an open center for blowing combustion air to the rear thereof, and a vaporizing cylinder (10, etc.) is rotatably driven in the blowing chamber (13). A motor (15) is provided.A combustion cylinder (1B) with an open center is fixed to the front part of the blowing chamber (13), and a conical guide cylinder (17) with an open end is attached to this opening. ) is fixed on the outer periphery of this guide tube (17), which has a nozzle through which vaporized fuel is ejected and combusted, and a combustion plate (18) which is open at the center and tilted is fixed, and furthermore, a combustion plate (18) is fixed on the outer periphery of the guide cylinder (17), which is open at the center and is slanted. An ignition heater (13) is fixed to the shaft end of the motor (15) to ignite the fuel for use.A scattering body (21) that receives and rotates the fuel supplied from the fuel nozzle (20) and a guide thereof are attached to the shaft end of the motor (15). Tube (17)
The vaporization tube (14) along the
The rim is shaped like a tip and the rim is bent toward the outer periphery, and the evaporation disc (22) is fixed to the rim with a small gap through which the fuel can flow out. The front edge side is diagonally expanded in diameter forward and outward, and is formed into a conical shape in the opposite direction to the carburetor tube (14), and between this expanded diameter portion and the inclined portion of the combustion ff1 (18). forms a spout (23), and this spout (
23) A flame detection sensor (3) that detects the color or brightness of the combustion flame that is ejected and burned from the ejection port (23) and the ejection hole of the combustion plate (18). ) is fixed to the upper end of the detection loft (24) and positioned near the front of the combustion tube (16), and the lower end of the detection loft (24) is L-shaped and has a roller (25) at the tip.
and the detection loft (20 is the burner case (11)
The roll (25) projects outward from the lower wall, and this projecting part is rotatably supported by a mounting plate (33) provided at the bottom of the burner case (11), and the roll (25) is connected to the feed roll (lO) axis. The flame detection sensor (3) is brought into contact with a friction disk (2B) provided at the end and having an uneven surface by a spring, and the rotation of the feed roll (10) causes the flame detection sensor (3) to be activated via the roll (25). It is configured to rotate back and forth.

A blower fan (27) is installed on the upper side of the burner case (11).
An air intake port (29) is provided in a state that projects into the burner case (11), and the air intake port (29) and this ventilation fan (27) are communicated with each other.
A ventilation duct (2) is provided between the opening of the ventilation chamber (13) and
8) for communication, and an air volume control device (3o) is provided on the side of the blower fan (27). The burner (1)
The combustion air for combustion that is blown inward is taken in by the blower fan (27) from the air intake port (29), and the air is drawn into the air duct (2
8) into the ventilation chamber (13), and the amount of air blown is determined by the color or brightness of the combustion flame detected by the flame detection sensor (3).
0), the rotation of the blower fan (27) is controlled to change the amount of combustion air blown for combustion.

Fuel for combustion is supplied from a fuel tank (31) installed at the front of the dryer (4) through a fuel hose, fuel pump (32)
, the combustion fuel is supplied to the outer circumferential surface of the scattering body (21) through the supply pipe and the fuel nozzle (20), and the amount of combustion fuel supplied is equal to the dry 41! (4) The fuel pump (32) is controlled by the operating device (5) to change the supply amount depending on the amount of grain stored in the fuel tank, the outside temperature, etc.

Note that an optical fiber may be used instead of the flame detection sensor (3), and if the detection part of the flame detection sensor (3) is contaminated by combustion flames, accurate detection may not be possible. When the flame detection sensor (3) is rotated back and forth, the detection section may be cleaned with a brush or the like.

Dry 1! (4) By operating the front operating device (5), this dryer II (4) is started and at the same time the burner (1) is activated.
The ignition heater (19) is energized, and the ignition heater (19) is energized.
9) becomes red hot, and combustion fuel is supplied from the fuel tank (31) through the fuel pump (32), etc., to the outer peripheral surface of the scattering body (21) through the fuel nozzle (20). The fuel is scattered onto the inner wall of the vaporizer tube (14), and while flowing down the inner wall of the vaporizer tube (10), it is ejected from a small gap in the vaporizer tube (14), and some of the ejected fuel is heated by the red-hot ignition heater. (19) scatters and automatically ignites, starting combustion.
The combustion flame heats the vaporization tube (14), and the fuel flowing down inside the vaporization tube (14) is vaporized. It burns while spewing out and becomes a combustion flame, and this combustion flame and the outside air passing around the burner (1) become drying hot air, and the exhaust air 41 at the rear of the dryer (4)! (7), the grains are ventilated across the drying chamber (9), and the grains stored in the drying chamber (4) are dried while flowing down from the storage chamber (8) into the drying chamber (9). When the grains are dried by being exposed to hot air and reach a specified moisture content, the operating device (5) automatically controls the dryer (4) to automatically stop the dryer (4). The amount of combustion fuel to be combusted in the combustion section (2) of section 1) is supplied by automatically controlling the fuel pump (32) with the operating device (5), and the combustion air for combustion is supplied to the combustion section (2) of section 1). 1
) The flame detection sensor (3) detects the color or brightness of the combustion flame ejected from the combustion flame while rotating back and forth, and based on this detection, the air volume control device (30) automatically controls the rotation of the blower fan (27). The blower fan (27) supplies the optimum amount of combustion air to match the supplied fuel, causing the burner (1) to burn.The color and brightness of the combustion flame ejected from the burner (1) are rotated. The flame is detected by the flame detection sensor (3), and the combustion air of the burner (1) is controlled by this detection, so that the combustion air that matches the combustion fuel is always controlled and supplied to the burner in a stable state. (1) burns.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an enlarged side sectional view, FIG. 2 is an enlarged rear view, and FIG. 3 is a partially cutaway side view of the dryer. In the figure, reference numeral (1) indicates a burner, (2) indicates a combustion section, and (3) indicates a flame detection sensor.

Claims (1)

[Claims] A detection sensor (3) that detects the color or brightness of the combustion flame ejected from the combustion part (2) of the burner (1), which burns while jetting fuel forward, is placed near the front of the combustion part (2). A combustion flame detection device for a burner, which is provided to rotate the combustion flame in the combustion flame ejection direction.