JPH09178168A - Rotation control method of burner motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate possible malfunctioning by correcting an output of a burner motor by changing, drying, discharging switches, a timer increment or decrement switch or the like to combine frequently used switches versatilely. SOLUTION: The supply of a fuel is changed altering an ontime output Ton of a solenoid valve or an electromagnetic pump 17. To achieve this, the number of revolutions N of a burner motor 20 which drives a fan 21 to introduce air for combustion is calculated by N=K×Ton+B so that characteristic values K and B of the formula can be altered beforehand depending on the burning condition or the like. A setting is made to enter a change setting mode according to the operation of switches respectively for charging, drying and discharging to start or stop a burner 6 or a device carrying the burner 6 thereon during the operation thereof and characteristic values K and B are corrected optionally by a timer increment/decrement switch. Moreover, the change setting mode is released by the switches for spreading and stopping. This enables versatilely combining of the frequently used switches thereby avoiding malfunctioning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation control method for a burner motor used as a heat source for grain dryers and the like.

[0002]

2. Description of the Related Art For example, in a grain dryer, a vaporization burner using kerosene as a fuel is used, and fuel is supplied by an electromagnetic pump or an electromagnetic valve added thereto. When the fuel supply amount is controlled to be changed for control or constant temperature control, the on time of the electromagnetic pump or electromagnetic valve is changed. At the same time, the on-time output controls the amount of air supply required for combustion. That is, the rotational speed of the burner motor that rotates the fan that introduces the combustion air is controlled to a predetermined value. By the way, since the control is executed by relating the on-time output to both the fuel supply amount and the introduced air amount in this way, the required air amount is proportional to the required fuel amount, which is convenient. However, it is necessary to correct the number of rotations of the burner motor due to variations in equipment.

For this reason, conventionally, the relation between the "inclination" and the "level" of the relational line with the burner motor rotational speed, which changes almost proportionally to the on-time output, is changed by two dedicated adjusting dials. While drying, the output of on-time change is frequently output and adjustment is not easy, but
It is desirable to be able to make adjustments during the drying process, where you can directly check the combustion state.

[0004]

Therefore, according to the present invention, a fan 21 configured to change the fuel supply amount while changing the on-time output Ton of the electromagnetic valve or electromagnetic pump 17 and introducing combustion air. Is a rotational speed control method of the burner motor 20 configured to calculate the rotational speed N of the burner motor 20 to be driven by N = K × Ton + B, and the characteristic values K and B of the equation are changed and set in advance depending on the combustion state or the like. The changeable setting mode is set in accordance with the operation of the existing switches 31, 32, 33 for starting and stopping the burner 6 or a device equipped with the burner 6 while the burner 6 is operating, and the other switches 38, 39 The characteristic values K and B are arbitrarily corrected by the above, and the rotation setting of the burner motor configured to release the change setting mode by the existing switches 31 and 34. The configuration of the rolling control method.

[0005]

The characteristic values K and B of the equation are set in advance depending on the combustion state or the like, and the change setting mode is set in accordance with the operation of the existing switches 31, 32 and 33 during the operation of the burner 6. Other existing switches 38, 3
Since the characteristic values K and B are arbitrarily corrected by 9 and the change setting mode is canceled by another existing switch 34, it is not necessary to provide a dedicated switch.

Particularly, in the grain dryer, when the burner motor output correction is executed by the existing switches such as the operation of each of the drying and discharging switches 32 and 33 or the operation of the timer increasing / decreasing switches 38 and 39 in addition to the operation of the pull-in switch 31. In this case, since the switches that are usually frequently used are commonly used, it is difficult to cause an erroneous operation.

[0007]

An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 is a frame of a grain drying apparatus, in which a storage chamber 2, a drying chamber 3, and a grain collecting chamber 4 are stacked in this order, and a drying chamber 3 is circulated by driving an elevator 5 provided outside.
This is a known form in which hot air generated by the combustion of the burner 6 and the suction fan 7 is applied to the section to dry it.

Reference numeral 8 is a feeding valve, 9 is a lower transfer device which communicates with the elevator 5, and 10 is an upper transfer device which is connected to the upper side of the elevator 5 and can supply grain to the diffusion plate 11 above the storage chamber 2. The burner 6 is a vaporization type burner, and a combustion disc 14 is provided on the front side with a vaporization cylinder 13 rotated by a motor 12 arranged in the center. Reference numeral 15 is a blower tube, and 16 is a fuel nozzle connected to the electromagnetic pump 17. In addition to the motor 12, a burner motor 20, a fan 21 rotated by the burner motor 20, and the like are provided in a burner case 19 having an opening 18 at the rear. Reference numeral 22 is a substrate of the burner 6, and the burner 6 main body is fixedly supported on the upper surface side thereof. A filter case 2 which can be freely inserted and removed on the lower side of the substrate 22.
3 is provided and the filter 24 is housed inside. When the fan 21 rotates, the inlets 25, 25 provided on the substrate 22
Introduced air enters the burner case 19 through the filter 24 and the connection duct 26 and passes through the blower tube 15.

A hot air duct 27 having a rectangular cross section is continuously provided on the front side of the burner 6 main body fixed to the substrate 22.
7 is fixed in a state of being inserted into the inlet of the hot air chamber. The burner 6, the grain circulation mechanism, and the like are performed by a computer including a memory that stores a control program necessary for drying control, various data, and the like. That is, the operation panel 30 is provided with switches 31, 32, 33, and 34 for selecting each work mode of grain loading, drying, discharging, and stopping, and drying for determining slow / fast drying speed. A setting switch 35, a set moisture switch 36, a swelling amount setting switch 37, and a timer time increasing / decreasing switch 38,
39 is provided. Reference numeral 40 is an emergency stop switch for stopping all in an emergency. It should be noted that each time the switches 35 to 37 are pressed, the switches move in the order of the display position according to a predetermined numerical value or mode (for example, on the right side). Which position the setting state is is the LEDs arranged in a horizontal row.
Is lit and displayed.

Reference numeral 41 denotes an abnormality monitor that displays an LED by detecting an abnormality in each part, and has a configuration in which the abnormal portion can be easily confirmed by the drawing. The built-in arithmetic control unit 42 receives the switch information of the operation panel 30 and the detection information from the sensors arranged in each unit of the dryer, and performs the necessary comparison calculation to control the burner combustion amount and start the grain circulation system.・ Perform stop control. Reference numeral 43 is a storage unit.

FIG. 4 shows a control block diagram. In addition to the setting information from the above switches, the arithmetic control unit 42 has detection information of the moisture meter 44 and grain detection information of the grain flow detector 45 provided in the throwing section of the elevator 5. , The temperature information of the hot air temperature detector 46 and the exhaust air temperature detector 47, the detection information of the wind pressure detector 48, etc. are input, while the output information is the combustion system signal of the burner 6, specifically, the electromagnetic pump 17 On-time signal Ton, the rotation speed N signal of the burner motor 20, the grain circulation system motor control signals of the vertical transfer devices 8, 9, the elevator 5, the feeding valve 8, etc., the suction fan 7 motor control signal,
The display unit 49 has water content, remaining time, hot air temperature display signals, and the like.

On-time signal T of the above electromagnetic pump 17
The relationship between on and the number of revolutions N of the burner motor 20 is given by the following equation, and the contents thereof are stored in the storage unit 43. That is, N = K × Ton + B .... Here, B and K are characteristic values indicating “level” and “slope”, respectively, and are set to a relation of B = 10 × VR1-300 ... K = VR2 + 70 ..., and VR1 and VR2 are arbitrarily set. These VR1, V are determined by
R2 is changed to a large or small value according to a combustion state such as red fire, lift combustion (flame is separated from the surface of the combustion plate more than appropriate). The relational expression of B and K is also stored in the storage unit 43.

By comparing the set hot air temperature Tc set by the on-time signal Ton, the drying control mode and the like with the hot air temperature Tb during the actual drying operation, the function of the arithmetic control unit 42 is changed so as to change and control the on-time width. Integrated into one. At the same time, it receives the on-time width change control signal, calculates the above N, and controls the rotation of the burner motor 20.

Next, during the drying operation, adjustment of "level" and "inclination" of the above N calculation formula, specifically, VR
The setting change of 1 and VR2 will be described. As shown in the flowchart of FIG. 6, the burner motor rotation speed output correction processing is performed after the stake-in switch 31 “ON” and then the drying switch 3
When "2" is "ON", "level" correction can be set, and when the discharge switch 33 is "ON", "tilt" correction can be set. After setting the "level" correction, when the timer increase / decrease switch 38 or 39 is turned "ON", the value of VR1 is changed to large or small, and as a result, the characteristic value B can be changed and corrected. Similarly, if the timer increase / decrease switch 38 or 39 is set to "ON" after setting the "tilt" correction, VR2
Since the value of is changed to a large value or a small value, the characteristic value K can be changed and corrected.

The "level" correction value or the "tilt" correction value is
As shown in FIGS. 7 and 8, it is rewritten and stored in the storage unit 43 by turning on the stretch switch 31 or the stop switch 34. In the flowcharts of FIGS. 7 and 8, the correction value is set to change by ± 1 every ± 30 steps by the “ON” operation of the timer increase / decrease switch. During the burner motor speed correction processing work during the above drying operation,
The output of the display unit 49 is switched from the usual repeated display output of the moisture content / remaining time / hot air temperature to repeatedly display the on-time output value, the burner motor rotation speed, and the “level” or “tilt” correction value.

During the correction process, when the timer decrease switch 39 is pressed while pressing the timer increase switch 38, the level setting and the inclination setting are returned to the initial values. For this reason, it is desirable to readjust the burner from the initial value, and the adjustment is easy. The burner motor 20 may still not be able to obtain the set value Nc even if the burner motor 20 rotation speed correction is performed due to variations in the power supply voltage and the power IC. In order to solve this, a rotation speed detection sensor (not shown) of the burner motor 20 is provided, and the set value N
The rotation speed Nm at this time (the m-th time) may be corrected by comparison with c. Since the rotational speed Nm is converted into the burner motor speed command voltage Vm, if the converted voltage Vm is corrected, for example, Vm = (Nc-Nm _-1 ) / C + Vm _-1 ... . C is a burner motor speed command voltage Vm obtained by variously changing the power supply voltage and the power IC,
It is a value predicted from the actual rotation speed Nm. It is not always necessary to use the converted voltage.

[0017] The initial setting rotational speed Nc ₀ and the actual rotational speed N ₀ of indexed from the initial Banamota velocity command voltage V ₀
And is configured to output an ignition command signal when it enters the range of Nc ₀ ± α. In this way, the initial combustion becomes stable. The operation of the above example will be described. When the stakeout switch 31 is turned on, the grain to be dried, which has been put into the hopper, is put into the storage section 2 through the elevator 5.

When the installation is completed, the stop switch 34 is turned on.
Then, each part is temporarily stopped. Next, the drying switch 32 is turned on in order to shift to the drying work, but the setting of the drying speed is set in advance by the switch 35 with the grain type as a guide, and the dry finishing moisture is set in advance by the setting switch 36. The elevator 5, the vertical transfer devices 7 and 10, the feeding valve 8 and the like are started to operate, and the burner is also in an activated state to start hot air drying. While flowing down the grain passage in the drying chamber 3,
The hot air acts to dry it, and it is returned from the grain collection chamber 4 to the storage tank 2 via the elevator 5 and is subjected to the refining action. Such circulation is repeatedly performed until the predetermined moisture is reached.

During the above-described drying operation, the combustion state of the burner 6 is monitored, and when red fire or lift combustion is confirmed, the output of the burner motor speed is corrected. That is, the stakeout switch 3
After "1" is turned "ON", the drying switch 32 is turned "ON". Now the "level" correction can be set and the timer increase / decrease switch 38 or 39 can be pressed to obtain the proper "level" (FIG. 7). On the other hand, when the discharge switch 33 is turned on instead of the drying switch 32, "tilt"
Can be corrected (Fig. 8).

When correcting the output of the burner motor speed, the on-time Ton value changes momentarily with the passage of time because the drying operation is being performed, but since the amount of change is in a minute range, the timer increase / decrease switch 38 is used. , 39, it is not necessary to regulate the on-time Ton output, but in order to improve the adjustment accuracy, the timer decrement switch 39 is pressed to return it to the initial value as described above, or this output is set to a predetermined value. Value of, for example, the above-mentioned tension switch 3
It may be configured such that the value can be fixed to the value when 1 is pressed or the intermediate value of the combustion range.

Further, in adjusting the "level", it is preferable to confirm at least two large and small positions where the on-time Ton output is different.
It is preferable to change the set temperature Tc. For this purpose,
This is performed by shifting the set values of the dry setting switch 35 and the sticking amount setting switch 37. The timer increase / decrease switch 38,
When the adjustment by 39 is completed, the stop switch 34 “O
N ”operation. As a result, each correction state of “level” and “inclination” is reset, and a new burner motor rotation speed N ′ is written in the storage unit 43.

As described above, in addition to the operation of the squeeze switch 31, the drying and discharging switches 32 and 33 are operated, or the existing switches such as the timer increasing and decreasing switches 38 and 39 are used to execute the burner motor output correction. , Does not need a dedicated switch. FIG. 9 shows an improvement in maintainability of the burner 6, in which the substrate 22 is divided into two parts 22a and 22b in the front and rear, a vertical axis fulcrum 50 is provided on the left side of these overlapping parts, and the rear side substrate 22b is the main body of the burner 6. At the same time, it pivots laterally ((a) in the figure) to facilitate the inspection of the front side of the burner 6. Further, FIG. 10 shows that the fixing of the handle 51 and the connection duct 26 is removed, and the rear side substrate 22b is rotated downward around the horizontal axis fulcrum 52 (FIG. 10B), and similarly, the front side of the burner 6 is inspected. Is to make it easy.

A discharge chute 53 is connected to the transfer start end side of the upper transfer device 10 to discharge the dried grains out of the machine by opening the shutter outside the drawing. In place of the discharge chute 53, a discharge slor 54 to be discharged to the storage tank may be connected. A motor 55 for exclusive use is provided in this discharge slor 54, and it is activated in response to the discharge switch 33 "ON" of the operation panel 30 to lift the dried grain.

By the way, when the grain flow detector 45 is activated during the discharging operation or when the clogging in the circulation path is detected by the detection of the overload of the circulation system motor, the arithmetic control unit 42 of the dryer causes the operation parts to operate. An immediate stop signal is output. However, in the case of providing the discharge thrower 54 as described above, if the circulation system motor and the thrower motor 55 are stopped at the same timing, a paddy clogging phenomenon occurs at the time of restart, so the paddy clogging is detected. At this time, a delay stop signal is output to the slower motor 55, and the slower motor 55 is provided to be stopped after the circulating motor is stopped.

[Brief description of the drawings]

FIG. 1 is a perspective view of a grain dryer.

FIG. 2 is a front sectional view of the grain dryer.

FIG. 3 is a front view of a control panel of a control box.

FIG. 4 is a control block diagram.

FIG. 5 is a sectional view of a burner.

FIG. 6 is a flowchart.

FIG. 7 is a flowchart.

FIG. 8 is a flowchart.

FIG. 9 is a plan view of a burner.

FIG. 10 is a side view of the burner.

[Explanation of symbols]

1 ... Dryer frame, 2 ... Storage room, 3 ... Drying room, 4 ... Grain collecting room,
5 ... Elevator, 6 ... Burner, 7 ... Suction fan, 8 ... Delivery valve, 9 ... Lower transfer device, 10 ... Upper transfer device, 11 ...
Diffusion board, 12 ... Motor, 13 ... Vaporization cylinder, 14 ... Combustion board,
15 ... Blower, 16 ... Fuel nozzle, 17 ... Electromagnetic pump,
18 ... Opening, 19 ... Burner case, 20 ... Burner motor, 21 ... Fan, 22 ... Board, 23 ... Filter case, 24 ... Filter, 25 ... Inlet port, 26 ... Connection duct, 27 ... Hot air duct, 30 ... Operation panel, 31 ... Tension switch, 32 ... Drying switch, 33 ... Ejection switch, 34
... Stop switch, 35 ... Drying setting switch, 36 ... Set moisture switch, 37 ... Swelling amount setting switch, 38 ... Timer increase switch, 39 ... Timer decrease switch, 40 ... Emergency stop switch, 41 ... Abnormality monitor, 42 ... Calculation Control unit, 4
3 ... Storage unit, 44 ... Moisture meter, 45 ... Grain flow detector, 4
6 ... Hot air temperature detector, 47 ... Exhaust air temperature detector, 48 ... Wind pressure detector, 49 ... Display unit

Claims (1)

[Claims] 1. A rotation speed N of a burner motor 20 configured to change a fuel supply amount while changing an on-time output Ton of an electromagnetic valve or an electromagnetic pump 17 and driving a fan 21 for introducing combustion air. Is a rotational speed control method of the burner motor 20 configured to be calculated by N = K × Ton + B, in which the characteristic values K and B of the equation can be changed and set in advance depending on the combustion state and the like. This change setting mode is set in accordance with the operation of the existing switches 31, 32, 33 for starting and stopping the burner 6 or a device equipped with the burner 6, and the characteristic values K and B are arbitrarily set by the other switches 38, 39. A method for controlling the rotation of a burner motor, which is configured to correct and further cancel the change setting mode by using the existing switches 31 and 34.