JPH01181015A - Air quantity controller for combustion of burner in grain drier - Google Patents

Abstract

PURPOSE:To obtain stable burner fan rotation by compensating fuel supply signals in an air regulating controlling means and outputting them as burner fan rotating signals on the basis of the signals from regulating resistance. CONSTITUTION:A fuel supply quantity for a burner 6 is determined to compare set temperature with detecting hot air, on-time width is made narrow at the time of high detecting hot air temperature, and made wide at the time of low detecting hot air temperature. Simultaneously, an air regulating control part 79 outputs drive signals to a motor fan 22 to obtain the rotation of a burner fan 21 based on the on-time signals. At the time of shipment or before drying work starting, regulating resistance 80, 81 is operated in order to absorb the individual dispersion of the burner 6 to secure blue flame combustion. The analog signals of the regulating resistance 80, 81 are taken in an operation controlling part 58 through an A/D converter 74, and the air regulating control part 79 compensates on-time signals to set rotating speed of the drive motor 22 of the burner fan 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a combustion air amount control device for a burner in a grain dryer.

[Prior art and problems to be solved by the invention] Conventionally, in a vaporizing burner installed in a grain dryer, for example, the amount of combustion air is adjusted or decreased in response to a fuel supply signal, for example, an on-time output of a fuel supply valve, etc. The rotational speed of the burner fan is controlled to a predetermined value, but the relationship between this fuel supply signal and the burner fan rotational speed requires delicate correction due to manufacturing variations of the burner.

For this reason, conventionally, the fuel supply signal from the arithmetic control section of a microcomputer that performs various drying controls is input into a separate air conditioning control circuit, and the above-mentioned variations have to be corrected.
I! The burner fan rotation speed is set by receiving an analog signal from the I resistance.

Since the fuel supply signal is corrected using the analog signal of the adjustment resistor in this way, there is a drawback that variations in the circuit occur and errors in the rotation speed are likely to occur.

[Means for solving problems]

For this reason, the present invention is configured to make the fuel supply amount variable based on a fuel supply signal such as an on-times signal to the fuel valve 29, and to change the setting of the combustion air supply amount to large or small in response to this signal. A microcomputer 59 that performs various drying controls in a grain dryer equipped with a burner 6
The arithmetic control section 58 incorporates an air conditioning control means 79 for controlling the number of revolutions of the burner fan 21 to obtain the amount of combustion air according to the fuel supply signal. A combustion air amount control device for a burner in a grain dryer is configured by inputting analog signals from adjustment resistors 80 and 81 through an A/D converter 74 to correct the relationship with the rotation speed.

[Action and effect of the invention]

In order to obtain a burner combustion state that should be set to a predetermined drying speed, etc. in the arithmetic control section of the microcomputer, a fuel supply signal is calculated and output based on the relationship with the set hot air temperature. On the other hand, the analog signal of the adjustment resistor is input to the arithmetic control section via the A/D converter. Based on the signal from this adjustment resistor, the air conditioning control means corrects the fuel supply signal and outputs it as a burner fan rotation signal.

Therefore, the analog signal of the adjustment resistor is not used to directly correct the fuel supply signal, that is, the burner fan rotation signal;
Since the adjustment resistance is inputted in advance in the arithmetic control section in a state where there are no variations in the circuit, stable burner fan rotation can be obtained. Furthermore, since the arithmetic and control section can be set alone, the board configuration can be simplified.

〔Example〕

An embodiment of this invention will be described based on the drawings.

Reference numeral 1 designates a frame of a grain dryer. Inside this machine frame, a storage tank 2, a drying chamber 3, and a grain collection chamber 4 are installed vertically from the top, and a part of the grain collection chamber 4 is installed outside the machine frame 1. Storage tank 2 for grain collected on the side
A grain lifting machine 5 is installed to raise and return the grain. In addition, the drying room 3 is
A grain flow passage 12.12 partitioned by a breathable material is formed between a hot air chamber 8 communicating with a wind cylinder 7 surrounding the burner 6 and a ventilation chamber 11 communicating with a fan cylinder 10 having a suction fan 9. Delivery valve 1 provided at the bottom of each downstream passage 12.12
It is configured to dry the grain by blowing hot air onto it at predetermined intervals through a constant rotation of 3.13.

The grain lifting machine 5 has a structure in which a packet belt is wound therein, and is configured to be able to scoop up dry grains transferred to one side by a lower transfer spiral 14 installed horizontally at the lower part of the grain collection chamber 4 and transfer them to the upper part. . The grains scooped up by the grain lifting machine 5 and thrown at the upper part are guided to the starting end side of a transfer trough 16 provided with an upper transfer spiral 15. Incidentally, the grains transferred horizontally by the transfer spiral 15 are transferred to a rotating diffusion plate 1 disposed at the upper center of the storage tank 2.
7 and is configured to be dispersed and dropped into the storage tank 2.

The burner 6 is attached to a support leg 1 on a base plate 18 fixed to the machine frame.
It is installed in a horizontal position through
and the motor 22 and vaporizer tube 23 to which the fan 21 is directly connected.
A case body 25 that houses the drive motor 24 and the like, a dish-shaped combustion tube 26 connected to the front surface of the case body 25, and the vaporization tube 23 located at the center of the combustion tube 26. A combustion disk 27 that fits into the combustion tube 26 and spouts vaporized fuel from a large number of nozzles.
Consists of etc. In addition, for liquid fuel such as kerosene, please use the fuel pump 28.
The fuel is supplied through the fuel valve 29, nozzle 30, etc. to the circumferential surface of a diffuser 32 provided at the tip end of the rotating shaft 31 to be rotated by the vaporizing tube 23. 33 is a blower tube, 34 is an ignition heater provided in a bulged portion 26a of a part of the outer periphery of the combustion tube 26, and 35 is a frame rod.

A container-shaped filter case 36 formed with a shallow bottom is provided at the bottom of the base plate 18 so that it can be slid back and forth. At the lower position, there is a guide body 38 formed in a front convex inclined guide surface, and the substrate 18 is connected to an inlet 40 bored at a corresponding position of a U-shaped baffle plate 39 fixed to the rear upper surface of this guide body. A detour passage is formed over an inlet 41 formed in the substrate 18, and a guide cylinder 42 provided in the base plate 18
A discharge port 43 is drilled at a position corresponding to . Note that this guide tube 42 connects one end of the combustion air introduction tube 20.

On the other hand, a duct 44 having a rectangular entrance cross section is connected to the front side of the board 18. That is, the square cylindrical body formed by the left and right side walls and the upper and lower opposing walls that narrow the facing distance between the front fields is
It is integrated by welding means with the bent edges 18b and 18c on the left and right sides of the front half of the substrate 18 and the downwardly inclined portion 18a continuous thereto.

The main body of the burner 6 is fixedly supported with respect to the base plate 18 to the duct 44 by the support legs 19 and the upper handle-like connecting member 45.

The wind cylinder 7 that should enclose the burner 6 has a mesh frame 46 on its rear surface biased to one side to allow ventilation, and is detachably attached to the machine frame 1 using upper and lower fasteners. It is. The burner 6 base plate 18 is configured such that the upper and lower bent edges 44a and 44b on the rear end side of the duct 44 can be fixed to the machine frame with a fastener so that the burner 6 portion is located in front of the mesh frame 46. It is. In this way, the outside air is introduced through the mesh frame 46, which has a relatively large opening area, bypasses the outer periphery of the burner 6, and moves toward the duct 44, which has a narrow opening area, and the flow rate becomes faster as the opening area of the duct 44 increases. It is the composition.

The fuel valve 29 is configured to be able to drip a predetermined amount of fuel onto the circumferential portion of the diffuser 32 through the nozzle 30 while controlling opening and closing in response to a fuel supply signal from a control mechanism unit described later, for example, a pulse signal with variable on-time. be.

A wind pressure sensor 47 detects the presence or absence of introduced outside air, and a temperature sensor 48 is placed above the frontage of the upper wall of the duct 44 to detect an abnormal state of the flame or an abnormal rise in the temperature of the hot air chamber 8. sell.

The grain circulation system consisting of the grain lifting machine 5 and the upper and lower transfer spirals 14 and 15 is rotated in conjunction with a circulation system motor 50 fixed to the upper side wall of the grain lifting machine 5 frame.

The drive shaft of the motor 50 rotates the shaft of the upper transfer spiral 15 at a rotational speed, and further rotates this shaft and a pulley shaft around which the packet belt of the grain lifting machine 5 is wound by a transmission belt 51. The lower transfer spiral 14 is connected to a pulley shaft at the lower part of the grain lifting machine 5 by a transmission belt 5.
They are interlocked and connected via 2.

Further, the delivery valves 13, 13 are operated by a nozzle (lube motor 53).
Therefore, the suction fans 9 are independently rotated by the fan motors 54.

Reference numeral 55 denotes a flexible discharge pipe 56 that communicates with the four portions between the transfer start end sides of the transfer gutter 16 via an opening/closing shutter (not shown).
is a stake hopper.

FIG. 1 shows a block circuit diagram, and drying control is performed by a microcomputer 59 located inside a control box 57 and composed of an arithmetic control section 58, a memory storing control programs necessary for drying control, and the like. That is, this arithmetic control section 58 has various operation switches 60, 61, 62, 63 (7) ON for loading, drying, discharging, stopping, etc.
, OFF signal, setting signal of the filling amount setting switch 64 and stop moisture value setting switch 65, grain type switch 66 switching signal, signal of pause drying time setting switch 67 during drying, and abnormal sensor (for example, the wind pressure sensor 47 or Temperature sensor 48, or overload detection sensor 68 of each part drive motor 50, 53, 54, full sensor 69, paddy flow sensor 7
0) or hot air temperature sensor 71
- Each output signal from the exhaust air temperature sensor 72 and moisture meter 73 is input. On the other hand, the ignition heater 34, fuel pump 28,
Burner 6 drive system signals for the fuel valve 29, drive signals for the circulation system motor 50, valve motor 53, fan motor 54, etc. are output. 74 is the hot air temperature sensor 71
75 is a switch input circuit, 76 is an input circuit, and 77 is an output circuit.

In FIG. 1, the arithmetic control section 58 is expressed as a general drying control function section 78 and an air condition control section 79 for convenience. Of these, the general drying control section 78 is used to control the hot air temperature set based on the amount of air to be blown, etc. Drying is performed while changing the fuel supply signal to the burner 6, that is, the on-time of the fuel valve 29 (with a constant period, which can be varied from 7 milliseconds to 40 milliseconds, for example) by comparing the detected hot air temperature and the set temperature so that It has functions such as a function to stop drying when a preset finishing moisture value is reached, or a function to display an abnormality or interrupt drying in response to abnormality information of each part.

On the other hand, the air conditioning control section 79 mainly has the function of controlling the rotation of the burner fan 21, and outputs the rotation speed y of the fan motor 22 which is proportional to the on-time X. That is, in the memory outside the figure, y=a (x-x,) +
b rpm (x is the on-time value at the minimum combustion amount, 7 milliseconds in the above example), and the fan motor 2 is
2 rotations can be changed. At this time, the constants a and b'' are set to the burner 6.
The adjustment resistors 80 and 81 are set based on individual variations. These adjustment resistors 80 and 81 are provided on the side wall of the burner wind barrel 7, and among them, the resistor 80 can set a constant (inclination adjustment), and the other resistor 81 can set a constant (level adjustment). The signal is converted into a digital signal via the A/D converter 74, and then taken into the arithmetic control section 58, and the air conditioning control section 79 corrects the on-time value that should apply to the above calculation formula to calculate y.
This is a configuration that requires a value.

Incidentally, the output of the frame rod 35 is taken into the air conditioning control section 79 and transmitted to the general drying control section 78.

82 is a digital display unit that displays the hot air temperature, detected moisture value, and remaining drying time; 83 is a group of abnormality display LEDs on the graphic monitor 84 provided on the control box 57;
5.86 is a program timer increase/decrease switch for setting the drying time.

The effect of the above example will be explained.

After filling the storage tank 2 with a predetermined amount of grain and setting the filling amount setting switch 64 and the stop moisture setting switch 65 to predetermined values, when the drying switch 61 is turned on, the rotating parts and the burner 6 are activated. Here, the burner 6 burns in response to a fuel supply amount determined based on outside temperature conditions and the setting of the above-mentioned charging amount, that is, a valve on time signal, and the fuel is supplied from the end of the nozzle 30, and the fuel is supplied from the diffuser. The 0 ignition fuel drips onto the circumferential surface of 32 and moves along the inner circumferential surface of the carburetor tube 26 along with the combustion air blown up by the fan 21 while being atomized. The fuel is ignited by the ignition heater 34 and combusted. - Once the combustion state occurs, the outer periphery of the vaporization tube 23 in the center of the combustion tube 26 is warmed by the flame, and the atomized fuel that is subsequently supplied is vaporized (
This vaporized fuel is ejected from the rear surface of the combustion disk 27 through the ejection port to continue combustion.

The combustion flame enters the duct 44, while the outside air generated by the suction fan 9 and entering from the mesh frame 46 of the wind barrel 7 passes through the outer periphery of the burner 6, enters the duct 44, and merges the flames. It turns into hot air.

The hot air generated in the duct 44 section, that is, the hot air chamber 8 population side, is
The grains are distributed before and after the hot air chamber 8, pass through the grain flow passage 12°12, reach the exhaust chamber 11, and are discharged outside the machine.

In the meantime, the falling grain is dried.

The grains that have passed through the downstream passages 12, 12 are collected in the grain collection chamber 4, subjected to the transfer actions of the lower transfer spiral 14, the grain lifting machine 5, and the upper transfer spiral 15, and returned to the storage tank 2 again. The tank 2
Inside, the grain is slowly cooled and tempered.

The drying process described above is repeated, and when the regularly measured moisture value reaches the initially set stop moisture value, the drying operation is automatically stopped, the motors of each part are turned off, and the fuel supply signal to the burner 6 is also cut off. Turn off.

The amount of fuel supplied to the burner 6 is determined by comparing the set temperature with the detected hot air temperature. When the detected hot air temperature is high, the on-time width is narrowed, and when the detected hot air temperature is low, the on-time width is set wide. However, at the same time, the wind control section 7
9 outputs a drive signal to the fan motor 22 in order to obtain the burner foot 221 rotation based on this on-time signal.

Incidentally, when the burner 6 is shipped or before the start of drying work, the adjusting resistors 80 and 81 are operated to adjust the constant a in the above relational expression in order to absorb variations in each burner 6 in order to ensure green flame combustion.
, b are set individually, and this adjustment resistor 80
．． The analog signal 81 is taken into the arithmetic control section 58 via the A/D converter 74, and the air conditioning control section 79 corrects the on-time signal and adjusts the burner fan 2 based on the above relational expression.
This is to set the number of rotations of the drive motor 1 522.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a block diagram, Fig. 2 is an overall side view, Fig. 3 is a front view thereof, and Fig. 4 is a block diagram.
5 is a side view of the burner section, FIG. 6 is a front view thereof, FIG. 7 is an enlarged sectional view of a portion thereof, FIG. 8 is a sectional view of the burner filter section, and FIG. 9 is a diagram showing the surface of the control box. In the figure, 1 is the machine frame, 6 is the burner, 7 is the wind barrel, 8 is the hot air chamber,
9 is a suction fan, 11 is an exhaust chamber, 12° 12 is a grain flow passage, 21 is a burner fan, 22 is a fan motor, 58
is an arithmetic control unit, 59 is a microcomputer, and 74 is A.
/D converter, 77 is a general drying control function section, 78 is an air conditioning control section, and 80.degree. 81 is an adjustment resistor.

Claims (1)

[Claims] Grain equipped with a burner 6 configured to make the fuel supply amount variable based on a fuel supply signal such as an on-time In the dryer, the arithmetic control section 58 of the microcomputer 59 that performs various drying controls incorporates an air conditioning control means 79 that controls the number of revolutions of the burner fan 21 to obtain the amount of combustion air according to the fuel supply signal. The controller 58 is used for combustion in the burner in the grain dryer, by inputting analog signals from the adjusting resistors 80 and 81 via the A/D converter 74 to correct the relationship between the fuel supply amount and the rotation speed of the burner fan 21. Air volume control device.