JP3829316B2 - Burner ignition detection device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a burner ignition determination device and can be used for a grain dryer or the like.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, a voltage based on a flame current is detected by a frame rod, and an ignition determination is performed while monitoring this voltage change, and energization to an igniter necessary for ignition is continued until the ignition determination is completed.
For this reason, there is a risk of erroneous detection due to igniter discharge.
[0003]
[Means for Solving the Problems]
The present invention is intended to eliminate the above-mentioned drawbacks. It is an ignition configuration by an igniter, and the flame current during combustion is detected by a flame rod and converted into a voltage to determine whether or not the voltage level falls below a predetermined level. In the ignition determination configuration for determining non-ignition, the ignition igniter is temporarily turned off when the change in the voltage after the fuel supply reaches a predetermined value or less, and the conversion voltage based on the frame rod is below the threshold value. It is set as the structure of the ignition determination apparatus of the burner which comprises the ignition determination means which determines the presence or absence of ignition by determining whether it exists.
[0004]
[Effects of the invention]
Turn off the igniter once when the flame rod conversion voltage of the flame rod reaches the specified voltage or less and the ignition state is predicted, and check if it is less than the threshold value in a state that is hardly affected by the noise by the igniter Thus, since the presence or absence of ignition is determined, stable ignition determination is possible.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a machine frame of a grain dryer, and a storage tank 2, a drying room 3, and a grain collection room 4 are vertically installed in the machine frame, and the drying room 3 includes a burner cylinder having a burner 5. Grain flow passages 9 and 9 are formed between the hot air chamber 6 leading to the air flow and the exhaust air chamber 8 leading to the fan body having the suction fan 7, and feeding valves 10 and 10 provided at the lower portions of the flow passages 9 and 9. It is the composition which dries hot grain on the grain which flows down for every predetermined quantity by constant rotation of, and dries.
[0006]
In the outside of the machine frame 1, a groining machine 11 is installed for raising and reducing grains collected in one side of the cerealing room 4 to the storage tank 2. The groining machine 11 has a configuration in which a bucket belt 13 is wound between a pair of upper and lower driving pulleys 12 and a driven pulley (not shown). The dry grain transferred to one side can be picked up and transferred to the upper part. Grains which are picked up by the groining machine 11 and thrown at the upper part are guided to the start end side of the transfer basket 17 provided with the upper transfer spiral 16 through the throw opening 15. Note that the grains that are horizontally transferred by the transfer spiral 16 are guided by a rotary diffusion plate 18 disposed at the upper center of the storage tank 2 and are diffused and dropped into the storage tank 2.
[0007]
The grain circulation system composed of the cerealing machine 11 and the upper and lower transfer spirals 14 and 16 is rotationally interlocked by an elevator motor 19 fixed to the upper side wall of the groining machine 11 frame. The motor 19 drive shaft has two drive belts 20, 21 and directly rotates and interlocks the shaft 22 of the upper transfer spiral 16 and the shaft 23 of the drive pulley 12 that winds the bucket belt 13 of the grower 11. .
[0008]
The side wall 24 at an appropriate height position of the groining machine 11 is provided with an intake port 25 so as to correspond to the distance between the left and right strokes of the forward and backward strokes B and B of the bucket belt 13. A moisture meter 26 is detachably provided on the lower side of 25. The moisture meter 26 has a known configuration in which, for example, one of the sample grains is crushed between a pair of electrode rolls, and the resistance value is electrically processed to be converted into a grain moisture value.
[0009]
The burner 5 is in the form of a vaporizing burner, and a combustion cylinder 28 is connected to the front side of the blower cylinder 27. A burner motor 29 is provided on the blower cylinder 27, and an inverted cone is provided on one of the motor shafts 30 protruding forward and backward. A diffuser 31 having a shape is provided, and a vaporizing cylinder 32 is disposed on the upper surface of the diffuser 31 in the reverse direction. Note that a guide body 33 for guiding the atomized fuel is provided in an extended shape on the peripheral surface of the release side end of the vaporizing cylinder 32. On the other hand, a fan 34 to which combustion air is to be introduced from an air introduction port 27a opened on the back side of the blower cylinder 27 is pivotally supported on the other end projecting side of the motor shaft 30. 35 is a blower cylinder fixedly provided on the center side of the combustion cylinder 28, and 36 is a combustion disc fitted to the combustion cylinder 28, which has a plurality of gas ejection holes 37, 37. The combustion cylinder 28 forms a bulging portion in a part when viewed from the front, and an igniter 38 as an ignition means including a pair of electrode portions is provided in the bulging portion. The igniter 38 can ignite the kerosene atomized fuel supplied from the nozzle 39. Reference numeral 40 denotes a frame rod capable of detecting the presence or absence of a flame, which detects a flame current during combustion and detects and outputs it to a control unit, and constitutes a detection unit of an ignition presence / absence determination means. An air filter 41 is provided on the outer periphery of the air inlet 27a on the back side of the blower cylinder 27.
[0010]
The burner 5 is fixed to the entrance portion of the guide wind tunnel 42 having a square cross section by a leg portion 43 and a connection portion 44 that also serves as a handle. The burner shell 45 that communicates with the hot air chamber 6 together with the guide wind tunnel 42. It is the structure with which it is attached.
The vaporizing burner 5 having the above-described configuration is configured such that kerosene as fuel is supplied by driving an electromagnetic pump 46 provided on the lower surface of the lower pedestal portion of the guide wind tunnel 42, and is ignited and burned by ignition by energization of the igniter 38. The amount of fuel supplied by the electromagnetic pump 46 compares the detected hot air temperature detected by the hot air temperature sensor 47 with the set temperature, and changes and controls the on-time of the electromagnetic pump 46 according to the difference, so that the hot air temperature falls within a predetermined range of the set temperature. It is controlled to become.
[0011]
FIG. 7 is a control block diagram, and a controller 49 of the controller 48 provided in the burner cylinder 45 has tension, drying, discharge, and stop mode switches 51, 52, 53, provided on the operation panel 50. 54, in addition to input signals such as grain type, finishing moisture, and setting amount switches 55, 56, and 57, and increase / decrease switches 58 and 59 for setting the drying time, the moisture meter 26, the frame rod 40, Various detection signals from the hot air temperature sensor 47 and the outside air temperature sensor 60 are input. On the other hand, examples of the output signal include a circulation system drive motor drive signal such as the elevator motor 19 and the feed valve motor 62, and a burner 5 drive signal. The burner drive signal includes an on / off signal of the electromagnetic pump 46, a large / small supply signal, a rotation speed command signal of the burner motor 29, an igniter 38 energization signal, and the like. The control unit 49 compares the preset temperature stored in advance with the average hot air temperature detected by the hot air temperature sensor 47, and the on-time of the electromagnetic pump 46 that is periodically turned on to reduce the difference. Change control to long or short.
[0012]
The operation of the above example will be described.
A predetermined amount of grain is put into the storage tank 2 by using the groining machine 11 from the filling hopper. Next, the grain type, finish moisture, etc. are set and the drying operation is started. Grains in the storage tank 2 are exposed to hot air while flowing down the drying chamber 3, and reach the cereal collection chamber 4. Grain that has been subjected to hot air is transferred to one side by the lower transfer spiral, cerealed by the cerealing machine 11, taken over by the upper transfer spiral 16, reaches the storage tank 2 again, and undergoes a tempering action for a while.
[0013]
When such a process is repeated and a preset moisture value is reached, drying is completed.
In the above drying, the burner 5 burns by igniting the fuel supplied from the electromagnetic pump 46 by the igniter 38. That is, combustion air is introduced by the rotation of the fan 34 accompanying the rotation of the burner motor 29, while the fuel from the nozzle 39 is atomized by high-speed rotation while colliding with the diffuser 31 and is formed on the inner peripheral surface of the vaporizing cylinder 32. The igniter 38 is ignited while moving along the guide body 33 and being guided by the guide body 33. After that, the atomized fuel that moves on the inner peripheral surface of the vaporizing cylinder 32 by the radiant heat generated by the combustion flame is gasified and reaches the back surface of the combustion disk 36, and is ejected from here to the front side and burned with blue fire.
[0014]
The control unit 49 constitutes an ignition determination means for controlling the energization command signal of the igniter 38 or controlling the energization / stop of the electromagnetic pump 46 based on the ignition determination or the extinction determination of the frame rod 40. The operation will be described based on the flowchart of FIG.
When the drying switch is turned on (step 1), the voltage is read from the frame rod 40 (step 2). For voltage reading, a flame current is output from the frame rod 40 and is converted into a voltage by the control unit. Thereafter, the burner motor 29 and the burner output are turned on (step 3), and the igniter 38 is also turned on (step 4). Further, after supplying the fuel (step 5), the frame rod 40 voltage is read (step 6). Here, the frame rod 40 voltages V ₀ and V ₁ in step 2 and step 6 are compared (step 7), and if the difference V ₀ −V ₁ is equal to or greater than a predetermined value (ΔV), that is, the voltage V _0. On the other hand, when V ₁ falls below a predetermined value, the igniter 38 is turned off (step 8). Again it reads the flame rod voltage in this state (step 9), and determines whether the voltage value V ₂ is below the threshold value V _TH which is set in advance (step 10). Here, “ignition determination” is made when V ₂ ≦ V _TH (step 11). When V ₂ > V _TH in step 10, it is determined that the ignition has not been performed or the fire has been extinguished, the igniter 38 is turned on again, and the ignition process is repeated. Thus, since the igniter 38 is once turned off when the frame rod 40 reaches a predetermined voltage or less, it is possible to make a stable ignition determination that is hardly affected by noise from the igniter 38.
[Brief description of the drawings]
FIG. 1 is an overall front view of a dryer.
FIG. 2 is a cross-sectional view of a dryer main body.
FIG. 3 is an enlarged view of a burner installation configuration.
FIG. 4 is a side sectional view of a burner alone.
FIG. 5 is a front view of a burner alone.
FIG. 6 is a front view of an operation panel surface.
FIG. 7 is a control block diagram.
FIG. 8 is a flowchart.
FIG. 9 is a graph showing a change in frame rod voltage.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Machine frame, 2 ... Storage tank, 3 ... Drying room, 4 ... Grain collection room, 5 ... Burner, 6 ... Hot air room, 7 ... Suction fan, 8 ... Air exhaust room, 9, 9 ... Grain flow passage, 10 DESCRIPTION OF SYMBOLS 10 ... Feeding valve, 11 ... Graining machine, 12 ... Drive pulley, 13 ... Bucket belt, 14 ... Lower transfer spiral, 15 ... Throw opening, 16 ... Upper transfer spiral, 17 ... Transfer basket, 18 ... Rotation diffusion Panel, 19 ... Elevator motor, 20, 21 ... Driving belt, 22 ... Upper transfer spiral shaft, 23 ... Driving pulley shaft, 24 ... Side wall, 25 ... Intake port, 26 ... Moisture meter, 27 ... Blower, 28 ... Combustion cylinder, 29 ... Burner motor, 30 ... Motor shaft, 31 ... Diffuser, 32 ... Vaporization cylinder, 33 ... Guide body, 34 ... Fan, 35 ... Blower cylinder, 36 ... Combustion disc, 37 ... Gas ejection hole, 38 ... Igniter, 39 ... Nozzle, 40 ... Frame rod, 41 ... Air filter, 42 Guide wind tunnel, 43 ... legs, 44 ... connection, 45 ... burner drum, 46 ... electromagnetic pump, 47 ... hot air temperature sensor, 48 ... controller, 49 ... control section, 50 ... operation panel, 51 ... tension switch, 52 ... Drying switch, 53 ... Discharge switch, 54 ... Stop switch, 55 ... Grain type setting switch, 56 ... Finishing moisture setting switch, 57 ... Extension amount setting switch, 58, 59 ... Increase / decrease switch, 60 ... Outside air temperature Sensor, 62... Feed valve motor

Claims (1)

In an ignition configuration that uses an igniter and detects the flame current during combustion with a flame rod and converts it into a voltage to determine whether the voltage level falls below a predetermined level. When the above change in voltage reaches a predetermined value or less, the ignition igniter is turned off once, and it is determined whether or not ignition is performed by determining whether or not the conversion voltage based on the frame rod is equal to or less than a threshold value. A burner ignition determination device comprising an ignition determination means.

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