JPH09303758A - Fuel control device of combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the fire of a burner during the combustion from being extinguished by correcting and controlling the change width of the on-time of a solenoid valve to a small width on-time when the on-time of the solenoid valve to feed the fuel is small, and the hot air temperature is low. SOLUTION: The set hot air temperature is compared with the hot air temperature to be detected by a hot air temperature sensor to detect the differential temperature, and the prescribed on-time in correcting the hot air temperature is changed by changing the change width of the on-time of a solenoid valve 43 above and below the on-time of 15msec. When the hot air temperature is corrected and controlled to the minus side, and the on-time of the solenoid valve 43 is >=15msec, the on-time change width is corrected and controlled to the large width on-time of 0.5msec. When the on-time of the solenoid valve 43 is <=15msec, the on-time change width is corrected and controlled by the small width on-time of 0.25msec. The hot air temperature is corrected and controlled so that it is same as the set hot air temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel control system for combustion equipment.

[0002]

2. Description of the Related Art Conventionally, for example, in a burner of a combustion device used in a grain dryer for drying grains, the hot air temperature generated from this burner is set according to the type of grain to be dried and the amount of grain. The on-time of the electromagnetic valve is controlled to achieve the set hot air temperature, and the amount of fuel supplied to the burner is controlled to burn. Hot air is generated by this combustion, and the generated hot air dries the grains. During this drying, the hot air temperature generated is detected,
The detected hot air temperature and the set hot air temperature are compared, and the changing range of the on-time of the electromagnetic valve is set so that the different temperatures are corrected to the plus side and the minus side so that the detected hot air temperature and the set hot air temperature are the same. Regardless, it is changed with a constant width on-time, the amount of fuel supplied to the burner is corrected, and the detected hot air temperature is controlled to be the same temperature as the set hot air temperature,
The grain is dried.

[0003]

At the beginning of grain drying, and when the hot air temperature is corrected to the downward direction, the burner parts are not yet warmed, and therefore the gasification of fuel is performed. In addition, the change range of the on-time of the electromagnetic valve is corrected and controlled with a constant width of on-time, so that a fixed amount of fuel can be maintained with a constant width of on-time regardless of whether the hot air temperature is high or low. When the set hot air temperature is a low hot air temperature, the low hot air temperature is significantly controlled to be reduced by the correction control, and the hot air temperature is corrected and controlled. Although the fire was extinguished, this invention is intended to eliminate this and always try to achieve stable combustion.

[0004]

To this end, the present invention controls the on-time of the electromagnetic valve 43 so that the hot air temperature TB generated and detected by the burner 3 becomes equal to the set hot air temperature TC. In the combustion device that controls the amount of fuel supplied to the burner 3, the hot air temperature TB and the set hot air temperature T
When the temperature difference T with respect to C is detected and the amount of fuel supplied to eliminate the temperature difference T is reduced, correction control is performed so that the on-time of the electromagnetic valve 43 at this time is equal to or greater than a predetermined on-time. The change width of the on-time 43 is corrected and controlled by the large on-time TN1, and if it is the following, the control device 84 for correcting and controlling the small on-time TN2 smaller than the large on-time TN1 is provided. The fuel control device is configured.

[0005]

With the burner 3 of the combustion equipment used in the grain dryer for drying the grain, the hot air temperature generated from the burner 3 is set according to the type of grain to be dried, the amount of grain, etc. The on-time of the electromagnetic valve 43 is controlled to achieve the set hot air temperature TC, and the amount of fuel supplied to the burner 3 is controlled to burn. Hot air is generated by this combustion, and the generated hot air dries the grains. During this drying, the generated hot air temperature TB is detected, the detected hot air temperature TB is compared with the set hot air temperature TC, the temperature difference T is detected, and this temperature difference T is used for correction control to reduce the fuel. When the on-time of the electromagnetic valve 43 at this time is equal to or longer than the predetermined on-time, the change range of the on-time of the electromagnetic valve 43 is significantly on-time TN1,
For example, correction control is performed by the control device 84 for 0.5 msec to correct the detected hot air temperature TB to be the same temperature as the set hot air temperature TC while the fuel amount supplied to the burner 3 is correction controlled. The grain is dried.

When the following is true, the change width of the on-time of the electromagnetic valve 43 is corrected and controlled by the control device 84 to a small on-time TN2 smaller than the large on-time TN1, for example, 0.25 msec, and the burner 3 is turned on. While the amount of fuel supplied to is corrected and controlled, the detected hot air temperature TB is corrected and controlled so as to be the same temperature as the set hot air temperature TC, and the grain is dried.

[0007]

By comparing the set hot air temperature TC with the detected hot air temperature TB, the temperature difference T is detected, the fuel amount is corrected to the reduction side, and the on-time of the electromagnetic valve 43 for supplying the fuel is small. When the detected hot air temperature TB is low, the change range of the on-time of the electromagnetic valve 43 is corrected and controlled to the small on-time TN2, so that the detected hot air temperature TB is largely and downwardly corrected and controlled. Therefore, the burner 3 during combustion is not extinguished, and the detected hot air temperature TB is corrected and controlled to be the same as the set hot air temperature TC in a stable combustion state.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. The illustrated example is a circulation type grain dryer 1 for drying grains.
It shows a state in which a moisture sensor 2 for detecting moisture in the grain, a burner 3 of a combustion device that generates hot air, and the like are attached.

The dryer 1 has a rectangular shape which is long in the front-rear direction and is provided with a transfer gutter 5 and a ceiling plate 6 in which a transfer spiral is rotatably installed in the upper part of the machine wall 4, and below the ceiling plate 6 is a grain. A grain storage chamber 7 for storing grains is formed. Inside the storage chamber 7, a full quantity sensor 20 that is turned on by the pressure of the grain by an ON-OFF switch method for detecting the full quantity of the grain is provided in a suspended state below the ceiling plate 6.

The grain drying chambers 8 and 8 are provided below the storage chamber 7 between the exhaust chambers 9 and 9 on both the left and right sides and the blower chamber 10 at the center, and below the drying chambers 8 and 8. Each of the feeding valves 11 for feeding and dropping the grain is rotatably supported. The collecting gutter 12 rotatably supports a transfer spiral and is provided below each of the drying chambers 8 and 8 so as to communicate with each other.

The burner 3 is installed inside a burner case 13, and the burner case 13 is detachably attached to the outer surface of the front machine wall 4 on the front side of the front machine wall 4 so as to correspond to the inlet side of the blower chamber 10. Installed in the dryer, the dryer 1, the moisture sensor 2
Further, an operating device 14 for starting and stopping the burner 3 and the like for each work of loading, drying and discharging is detachably provided on the outer surface of the front machine wall 4.

The exhaust fan 15 is provided on a rear side exhaust wall 9, which is provided at the central rear side exhaust duct 17 of the exhaust passage chamber 16 provided so as to communicate with the left and right exhaust chambers 9, 9. 4 is this blower 1
5 is provided. The valve motor 19 drives the delivery valves 11 and 11 to rotate via a speed reduction mechanism.

The diffusion plate 21 is provided at the center of the bottom plate of the transfer gutter 5 in the front-rear direction and below the supply port for supplying the transfer grains to the storage chamber 7 to uniformly diffuse and reduce the grains to the storage chamber 7. ing.
The grain-sustaining machine 22 is provided on the outside of the front machine wall 4 and has a belt with a bucket conveyor 23 stretched inside. The upper end is provided with a throw-out cylinder 24 between the transfer gutter 5 and the starting end. The lower end portion is provided with a supply gutter 25 between the lower end portion and the terminal end portion of the grain collecting trough 12 for communication.

The grain elevator motor 26 is used for the bucket conveyor 2
The belt with 3 and the transfer spiral in the transfer gutter 5, the transfer spiral in the diffuser 21 and the grain collecting gutter 12, etc. are rotationally driven. The moisture sensor 2 is provided substantially vertically in the center of the grain raising machine 22, and the moisture sensor 2 is rotated by the moisture motor 27 when an electric measurement signal is transmitted from the operating device 14. Each part is driven to rotate, and bucket conveyor 2
In step 3, the grain that falls during the transportation to the upper portion is received, and while the grain is crushed and crushed, the water content of the crushed grain is detected.

The burner 3 is composed of a front combustion device and a rear air blower, and the fuel from the nozzle 28 is scattered by the cup motor 29 rotated by the cup motor 29.
1, the vaporization chamber 35 formed by the combustion plate 33 and the combustion cylinder 34 through the space between the cup 30 and the air guide cylinder 32.
The fuel is supplied inside and the fuel is vaporized in the vaporization chamber 35.

Combustion air is supplied to the inside of the combustor at the front part by the wind generated by the blower motor 38 which is rotated by the burner motor 37 provided inside the blower tube 36 at the rear part. From the bottom of the combustion device, blower pipe 39
The rotation of the blower 38 is controlled by a rotation control device (not shown) provided on the outer surface of the burner case 13 in accordance with the supplied fuel.

A part of the fuel is scattered by the heater 40 and ignited to be burned, the fuel is vaporized in the vaporization chamber 35 by this combustion, and the combustion air mixed with the vaporized fuel is burned. The combustion flame is configured to be ejected from the ejection port 41 of the combustion plate 33 to become hot air. The fuel pump 42 and the electromagnetic valve 43 are provided on the lower side of the burner 3, and the electromagnetic valve 43 is operated by a pulse having a constant frequency to change the on-time to change the fuel flow rate. Fuel tank 4 through the provided fuel pipe 44a
The fuel is sucked from No. 5 and is supplied to the nozzle 28 of the burner 3 through the fuel pipe 44b while controlling the flow rate with the electromagnetic valve 43.

Assuming that the dryer 1 is a machine capable of processing 6 to 28 stones, the on-time of the electromagnetic valve 43 is the minimum hot air temperature TC in the control microcomputer 61 in the operating device 14. From 8msec,
It is configured to operate within the adjustment range of 40 msec at the maximum set hot air temperature TC, and the on-time control width is
The configuration is such that it can be controlled as small as 0.125 msec. Set hot air temperature TC depending on the type of grain and the amount of grain
Is set, the on-time is set by the set hot-air temperature TC, and the set hot-air temperature TC and the hot-air temperature sensor 60 are set.
The temperature difference T is detected by comparing it with the hot air temperature TB detected in step 1. The predetermined on-time when the temperature difference T is detected and the hot air temperature TB is corrected is an on-time of 15 msec or more. , And in the following, the change range of the on-time of the electromagnetic valve 43 is changed, and the hot air temperature TB
When the on-time of the electromagnetic valve 43 is 15 msec or more at the time of correction control to the minus side, the on-time change range is a large on-time T of 0.5 msec.
When the correction time is N1 and the on-time of the electromagnetic valve 43 is 15 msec or less, the on-time change range is 0.
The correction control is performed with a small on-time TN2 of 25 msec, the hot air temperature TB is corrected, and the correction control is performed so as to be the same as the set hot air temperature TC. The on-time at the start of drying of the electromagnetic valve 43 is set to 28 msec, and the output pulse period is 62.5 msec.
And

The operating device 14 has a box shape, and a push button for starting the dryer 1, the moisture sensor 2, the burner 3 and the like on the surface plate of the box for each operation of drying, drying and discharging. Each of the starting means 46 of the ON / OFF switch of the method, the stopping means 47 for stopping the operation, the moisture setting means 48 for setting the finishing target moisture of the grain, the indicator lamps 49 for each moisture, the hot air temperature generated from the burner 3 are displayed. Grain type setting means 50 to be set, each display lamp 51 for each type of grain, stake amount setting means 52 for setting the amount of grain to be stuck, and each display lamp 5 for each number of stones
3. Moisture correction means 54 for correcting the grain moisture value, timer increase / decrease setting means 5 for increasing or decreasing the set time of the timer
5, 56, a buzzer stop means 57, a display section 58 for digitally displaying various display items, a monitor display lamp 59 and the like are provided. For example, when the moisture setting means 48 is turned on, the respective display lamps 49 are sequentially turned on. When the lighting is 15.0, if the moisture setting means 48 is turned off, the finish target is obtained by this operation. Water content is 15.0
The hot air temperature and the like can be set in the same operation procedure.

The control device 84 is provided in the operating device 14,
The control device 84 includes a control microcomputer 6
1, each input circuit, each output circuit, and the like. Digital information, determination with a moisture sensor, etc. are input to the control microcomputer 61 via a digital input circuit 62, and detection of the frame lot 63 is input via a comparison circuit 64, and each of sticking, drying, and discharging is input. Starting means 46, stopping means 47, timer increasing / decreasing means 55, 56,
Grain type setting means 50, swelling amount setting means 52, moisture setting means 48, moisture correcting means 54, buzzer stopping means 57, full sensor detection ON time setting means 65, full sensor automatic stop time setting means 66, etc. are digital. The analog sensor information, the moisture sensor 2, the hot air temperature sensor 60, the outside air temperature sensor 68, the exhaust air temperature sensor 69, and the like are input from the analog input circuit 70 to the AD changing circuit 71.
It is input via the serial data receiving circuit 72. The memory 74 includes a non-volatile memory 75
From the memory 74 and from the memory 74 to the non-volatile memory 75. The serial data transmission circuit 73 is input from the control microcomputer 61.

The control microcomputer 61 is
The motors 18, 19, 26 are controlled to start and stop via the output circuit 76, and the fuel pump 42, the cup motor 29, and the igniter 78 are started via the output circuit 77.
And the stop control is performed, and the moisture motor 27 is passed through the output circuit 79.
Is controlled to start and stop, various items are controlled to be displayed on the display unit 58 via the display output circuit 80, and the on-time of the electromagnetic valve 43 is controlled via the on-time output circuit 81.
The burner motor 37 is started via the circuit command output circuit 82,
The burner motor 37 is stopped and the rotation speed is controlled, and the rotation speed is input from the burner motor 37 through the rotation pulse input circuit 83.

The combustion control of the burner 3 is started when the combustion control of the burner 3 is started (step 101) and it is detected whether or not the drying operation for drying the grain is being performed (step 102). When YES is detected, the burner is controlled. It is detected whether the amount of fuel supplied to No. 3 is on the lower side (lowering the hot air temperature TB) (step 103), and if YES is detected, it is detected whether the on-time of the electromagnetic valve 43 is smaller than 15 msec (step). 104), when YES is detected, the electromagnetic valve 4
The change width to change the on-time of 3 is the detected hot air temperature TB
And the set hot air temperature TC, the obtained temperature difference T
Irrespective of the above, for example, the detected hot air temperature TB is corrected and controlled to be the same as the set hot air temperature TC while being corrected and controlled to the small on-time TN2 of 0.25 msec (step 105). Ordinary drying work process processing is performed at this hot air temperature TB that has become the same as TC (step 106), and whether the grain moisture detected by the moisture sensor 2 is the same as or less than the target finish moisture. Is detected (step 106) and if YES is detected, it is determined that the drying of the grain has been completed, the drying operation end step process is performed (step 108), and the RET is performed (step 109).

When NO is detected in step 102, the process proceeds to step 109. NO is detected in step 103,
The on-time of the electromagnetic valve 43 at this time is 15 msec.
When it is detected that the above is the case, the change width for changing the on-time of the electromagnetic valve 43 is corrected and controlled to the large on-time TN1 of 0.5 msec, for example. Also, NO is detected, and the on-time of the electromagnetic valve 43 at this time is 15 m.
When it is detected that it is equal to or less than sec, the change width for changing the on-time of the electromagnetic valve 43 is corrected and controlled to the small on-time TN2 of 0.25 msec, and the detected hot air temperature TB is made equal to the set hot air temperature TC. The correction control is performed so that (step 110), and the process proceeds to step 106.

If NO is detected in step 104, the detected hot air temperature TB is not changed and the process proceeds to step 106. If NO is detected in step 107, step 10
Return to 6. FIG. 9 is a diagram showing combustion control of the burner 3. Regarding the combustion control of the burner 3, the combustion control of the burner 3 is started (step 201), and it is detected whether or not the drying operation for drying the grain is being performed (step 202). When YES is detected, the burner 3 is supplied to the burner 3. It is detected whether the amount of fuel to be changed is changed to the lower side (the hot air temperature TB is lowered) (step 20).
3), if YES is detected, the blower 38 of the burner 3
Is controlled to be a target low rotation speed of 1500 rpm (step 204), and it is detected whether the rotation speed of the blower 38 is within a predetermined range of 1500 rpm ± 100 rpm (step 205), and YES is detected. Then, the on-time of the electromagnetic valve 43 is lowered and adjusted (step 206).

If NO is detected in step 203, it is detected whether the amount of fuel supplied to the burner 3 is changed to the increasing side (the hot air temperature TB is increasing side) (step 207). Adjustment is performed by raising the on-time of the valve 43 (step 208). It is detected whether or not a certain time has elapsed after the adjustment of increasing the on-time (step 209), and when YES is detected, the rotation speed of the blower 38 of the burner 3 is, for example, a target high rotation speed of 2500 rp.
m (step 210) and RET (step 211).

NO is detected in step 202, step 2
When NO is detected in 05, adjustment is completed in step 206, NO is detected in step 207, and NO is detected in step 209, the process proceeds to step 211. As described above, the amount of fuel supplied to the burner 3 by the on-time control of the electromagnetic valve 43 is reduced, but the balance is lost unless the amount of combustion air supplied by the rotation speed control of the blower 38 is reduced. Although the combustion state deteriorates, according to the present invention, the combustion air amount is changed in accordance with the change in the supplied fuel amount, so that stable combustion can always be obtained.

FIG. 10 is a diagram showing a configuration in which the ON time for the grain detection in the full weight sensor 20 and the automatic full stop time can be set. The ON time for detecting the full sensor 20 is the full sensor detection ON time setting means 6 provided in the operating device 14.
By the operation of 5, the time can be set in three stages of, for example, 5 seconds, 10 seconds, and 15 seconds, and the full automatic stop time of the full sensor 20 is the operating device 1
By operating the full sensor automatic stop time setting means 66 provided in FIG. 4, it is possible to set the time in three stages of 30 seconds, 1 minute, and 1 minute 30 seconds.

In the full-grain detection control of the full-quantity sensor 20, the grain-detection is started by the full-quantity sensor 20 (step 301), and the sticking operation for sticking the grain into the dryer 1 is performed. It is detected whether it is in the middle (step 302), and the full sensor 20
Is read (step 303), the full sensor detection ON time setting means 65 is operated, and the ON time of detection detected by the full sensor 20 set by this operation is read (step 304). The full sensor automatic stop time setting means 66 is operated, and the full automatic stop time from the detection of the full amount to the stop of the full sensor 20 set by this operation is read (step 305), and the storage chamber 7 is stored. It is detected that the inside is full of grains and the full stop process (step 306), and if NO is detected, it is detected whether the full sensor 20 is in the ON state (step 307), and YES.
Is detected, the detection O set by the full sensor 20 is set.
It is detected whether N hours have passed (step 308), and YE
S and the stop stroke due to full load are set (step 3
09).

When NO is detected in step 306, it is detected whether the set automatic stop time of the full sensor 20 has elapsed (step 310). When YES is detected, the completion of the staking operation is set. (Step 311), R
ET is made (step 312). NO in step 302
Detection, step 307 detects ON, step 308
When it is detected as ON in step 309, setting is completed in step 309, and when NO is detected in step 310, the process proceeds to step 312.

According to the above, the full amount sensor 20 can be adjusted up and down in three steps in the past, but according to the present invention, the setting of the detection time of the full amount sensor 20 can be changed. Adjustment can be abolished, cost can be reduced, and the amount of grains that can be infused into the storage chamber 7 changes depending on the moisture value of the grains to be infused, the amount of mixed rice cake, etc. Sometimes, on the other hand,
The ability to change the setting of the automatic full stop time made it possible to easily deal with it.

[Brief description of drawings]

FIG. 1 is a flowchart.

FIG. 2 is an enlarged side view of a fuel pump and an electromagnetic valve.

FIG. 3 is an enlarged side sectional view of a burner.

FIG. 4 is an enlarged front view of the burner.

FIG. 5 is a side view of the grain dryer.

FIG. 6 is an enlarged sectional view taken along line AA of FIG. 5;

FIG. 7 is an enlarged front view of the operating device, which can be partially broken.

FIG. 8 is a block diagram.

FIG. 9 is a flowchart showing another embodiment.

FIG. 10 is a flow chart showing another embodiment.

[Explanation of symbols]

 3 Burner 43 Electromagnetic valve 84 Controller TB Hot air temperature TC Hot air temperature T Temperature difference TN1 Large on-time TN2 Small on-time

Claims (1)

[Claims] 1. An electromagnetic valve 4 for making the hot air temperature TB generated and detected by the burner 3 the same as the set hot air temperature TC.
In order to eliminate the temperature difference T by detecting the temperature difference T between the hot air temperature TB and the set hot air temperature TC in a combustion device that controls the on-time of No. 3 to control the amount of fuel supplied to the burner 3. If the on-time of the electromagnetic valve 43 at this time is correction control to the side where the supplied fuel amount decreases to a predetermined on-time or more, the change range of the on-time of the electromagnetic valve 43 is greatly corrected and controlled by the on-time TN1. Then, the fuel control device for the combustion device is provided with the control device 84 for performing the correction control with the narrow on-time TN2 smaller than the large on-time TN1.