JPH0684813B2 - Control method of burner device for hot air generation in grain dryer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a method for controlling a burner device that generates hot air to be fed as dry air to a grain in a grain dryer.

The burner device for hot air generation in the grain dryer detects the generated hot air temperature with the hot air temperature sensor in order to keep the temperature of the hot air sent to the grain substantially constant, and The burner device is controlled in combustion operation.

The control of the combustion operation of the burner device is usually performed by adjusting the supply amount of fuel. To adjust the supply amount of fuel, the nozzle 1 of the burner device a is adjusted as shown in FIG. Pipe line 2 for pumping fuel oil by fuel pump P
To the branch pipe 20, the return pipes 21 and 22 communicating with the fuel tank T are connected in parallel to the branch pipe 20, and the return pipes
21.22 are provided with throttle valves 21a.22a capable of adjusting the flow rate as desired, and electromagnetic valves 3.4 are provided. By selecting these electromagnetic valves 3.4 to perform on / off operation, (1) A state in which the supply amount of all the fuel oil pumped by the fuel pump P is sent to the nozzle 1 is H (high), (2) A part of the fuel oil pumped by the fuel pump P is one The amount of fuel returned to the fuel tank T from the return pipe 21 and the amount of the fuel subtracted from this return is sent to the nozzle 1 is M (medium).
(3) Fuel tank T for fuel oil pumped by fuel pump P
The return to the nozzle is done by the two return pipes 21 and 22 and the return amount is increased.
There is a means for switching the supply amount supplied to the L state to the L (low) state and adjusting the supply amount stepwise.

The present invention is directed to a control method for controlling the combustion operation of a burner device that uses this stepwise means for adjusting the supply amount of fuel oil according to the hot air temperature.

Therefore, the conventional control non-advertisement, which is based on the fuel adjusting means of the above-described embodiment, creates four positions by adding the OFF state for stopping the fuel pump P to each of the H, M, and L states. , Among them, for example, H and M, M and L, L and OFF, H and O
Patterns that alternately switch between the two positions selected as desired, such as FF, are set, and these patterns are made to correspond to predetermined temperature ranges, respectively, and compared with the set temperature set by the temperature setting dial from those patterns. The pattern to be adapted is selected and the two positions of the selected pattern are alternately switched by comparing the signal of the hot air temperature detected by the hot air temperature sensor TH with the set temperature. However, in the conventional means, the pattern to be selected is changed due to the change in the outside temperature. Therefore, for example, when the pattern for alternately switching between M and L is selected, the M Since the state continues for a long time or the state of L continues for a long time, many patterns of combinations of two positions selected from the above four positions are made corresponding to changes in the outside air temperature. Is provided so that the pattern selected by the set temperature is corrected by the outside air temperature detected by the outside air temperature sensor, and the applicable pattern is selected.

However, in order to perform the control for selecting from a large number of patterns by performing the correction by the outside air temperature sensor as described above, it is necessary to perform processing by using the microcomputer, and thus the above-described conventional means complicates the control device. Not only that, but there is a problem that the price increases due to the expensive microcomputer.

By the way, the applicant of the present invention has found that the problem that the fuel state continues at one position of the selected two-position pattern that occurs in the conventional control means is caused by the fluctuation of the outside air temperature. The continuous state at the position can be a sensor for detecting the fluctuation of the outside air temperature, and the continuous state is that the amount of fuel supplied is in relation to the set temperature,
It is caused by insufficient or excessive feeling, so it is possible to use the outside air temperature sensor or microcomputer by transferring to the pattern of 2 positions which is ranked higher or lower than the selected 2 position pattern. However, since it was conceived that a predetermined control operation for alternately switching between two positions would be performed, as a means for solving the above-mentioned problem, Japanese Patent Application No. 60-272814 (Japanese Patent Laid-Open No. 62-272814) No. 131116), a control method of a burner device for generating hot air in a grain dryer was developed and filed.

This means sets a plurality of two-position patterns consisting of a combination of two positions selected from a plurality of adjustment positions for changing the amount of fuel supplied to the burner device in stages, and of the two-position patterns, The temperature control circuit selects a pattern corresponding to the desired set temperature from the above, and the switching between the two positions of the selected two positions is inputted to the temperature control circuit and the temperature signal of the hot air temperature sensor and the setting. Two positions that are ranked next to the position in the continuous state by detecting the continuous time of combustion operation at each switched position by comparing with the temperature and reaching the constant time. It is a method for controlling a burner device for hot air generation in a grain dryer, which is characterized by controlling so as to switch and shift to a pattern of Issue came out.

That is, the combustion supply amount is adjusted to a high (H) adjustment position, a medium (M) adjustment position, a low (L) adjustment position, and the fuel pump P is stopped to stop the fuel supply ( Turn OFF) and make four adjustment positions
As for M, ML, and LOFF, when controlling by setting a plurality of two-position patterns consisting of a combination of two positions selected from these adjustment positions,
The discharge pressure of the fuel pump P at each of the H, M, and L adjustment positions is set to be high at the H adjustment position where the discharge amount is large and to be gradually decreased at the M and L adjustment positions where the discharge amount is gradually decreased. Therefore, the diameter of the fuel oil particles ejected from the nozzle 1 of the burner device a is set to L at the adjustment position.
It will be gradually larger as it is gradually shifted toward. The increase in the diameter of the fuel oil particles ejected from the nozzle 1 due to the decrease in the pump discharge pressure has a great influence on the ignition / starting. If the pump discharge pressure is about 7 kg / cm ² , the ignition / starting is surely performed. Although it is carried out, when it drops to around 4 kg / cm ² , the particle diameter of the jetted fuel oil becomes large and almost no ignition occurs.

Therefore, due to the mutual transition between the two LOFF positions,
In the case of including a control for obtaining a combustion state lower than the combustion state at the adjusting position of, the pump discharge pressure at the adjusting position of L must be set to about 7 kg / cm ^{2 at} which ignition / starting is reliably performed. There is a constraint that the stepwise adjustment range of the combustion state cannot be large. Further, when the ignition / starting is started at the adjusting position of H, the pump discharge pressure at this adjusting position is high, and therefore the particles of the fuel oil ejected are extremely fine, so that the ignition is surely performed. However, since the expansion at the time of ignition is large, there is a problem that a large ignition noise is generated, and the flame causes so-called back combustion in which the flame temporarily enters the inside of the burner device a. There is.

The present invention is made in order to solve these problems, and the pump discharge pressure at the L adjusting position is
Control to obtain a low combustion state by the combustion operation at the L adjustment position while setting it as low as about 4 kg / cm ² so that the combustion range can be widened without causing ignition failure. Therefore, it is an object of the present invention to provide a new means that does not cause a large ignition noise or back combustion at the time of ignition / starting.

Further, in the present invention, as a means for achieving this object, the fuel supply amount to the burner device is increased.
A setting that sets a plurality of two-position patterns consisting of a combination of two positions that are selected from a plurality of adjustment positions that change in stages such as medium / low / off, and sets the pattern from those two positions as desired A pattern suitable for temperature is selected by the temperature control circuit, and switching between the two positions of the selected two positions is performed by comparing the temperature signal of the hot air temperature sensor input to the temperature control circuit with the set temperature. By detecting the continuous time of the combustion operation at each of the switched positions and reaching the fixed time, the switching can be switched to the pattern of two positions ranked next to the position in the continuous state. In the control method of the burner device for hot air generation in the grain dryer, the following control of low combustion operation in which the fuel is supplied at a low amount and combustion is performed is performed. The pattern of the switching transition between the adjustment position where the supply amount of fuel is in the middle and the adjustment position where the supply amount of fuel is cut off is set as the pattern, and the time of the adjustment position where the supply amount is inside and the adjustment position where the supply amount is cut off As a first invention, a control method of a burner device for hot air generation in a grain dryer, which is characterized by performing a combination of long and short time periods, is proposed as a first invention, and the fuel supply amount to the burner device is set to high and medium.・ A set temperature that sets a plurality of two-position patterns consisting of a combination of two positions that are selected from a plurality of adjustment positions that change stepwise, such as low and disconnection, and sets the desired pattern from those two-position patterns The temperature control circuit selects a pattern adapted to the above, and switching between the two positions of the selected two positions is performed by comparing the temperature signal of the hot air temperature sensor input to the temperature control circuit with the set temperature. When the continuous time of the combustion operation at each of the switched positions is detected and the continuous time reaches a certain time, the switching transition of the pattern of two positions ranked next to the position in the continuous state. In a method of controlling a burner device for hot air generation in a grain dryer, the ignition start in a two-position pattern including a selected desired two-position pattern and a cut-off adjustment position is performed at an intermediate adjustment position. A method for controlling a burner device for hot air generation in a grain dryer, which is characterized in that it is controlled so as to switch to a high adjustment position or a low adjustment position of a selected two-position pattern after ignition start. It is proposed as a second invention.

Next, embodiments will be described in detail with reference to the drawings.

FIG. 2 is a block circuit diagram of the control circuit of the control device of the burner device used for implementing the present invention. In FIG.
As shown in FIG. 1 described above, the hot air provided in the hot air supply passage (air guide passage) provided in the grain dryer A so as to detect the temperature of the hot air generated by the burner device a. A temperature sensor, P is a fuel pump composed of an electromagnetic pump provided in a pipe line 2 for supplying fuel oil to the nozzle 1 of the burner device a, 3
Is a return pipe communicating with the branch pipe 20 connected to the pipe 2.
Reference numeral 21 denotes a solenoid valve installed at 21, and 4 a solenoid valve installed at the return conduit 22. Reference numeral 5 denotes a temperature setting dial mounted on a control panel provided on the outer surface of the grain dryer A.

Reference numeral 6 designates a two-position pattern adapted to a desired temperature set by the temperature setting dial 5, mutual switching between respective positions of the selected two-position pattern, and a two-position ranked next. In the temperature control circuit that switches the pattern, HM and M set by a combination of two positions selected from the four adjustment positions of H, M, L, and OFF described above.
There are three patterns of two positions, L and LOFF, and a plurality of patterns in which the length of the operating time of the M adjusting position and the length of the operating time of the OFF adjusting position in the pattern of the two positions of MOFF are combined. It is set by a control circuit which is stored in a memory circuit and which selects a two-position pattern adapted to the set temperature set by the temperature setting dial 5, and a temperature signal input from the hot air temperature sensor TH and the temperature setting dial 5. A comparison circuit for comparing the set temperature with each other and alternately switching between the two positions, two timer circuits for detecting the continuous operation time of each position of the two positions in each pattern, and the control circuit having two positions of MOFF. When the pattern of is selected, it is suitable for the set temperature from the combination pattern of the length of the operation time at the M adjustment position and the length of the operation time at the OFF adjustment position. Control circuit for selecting a pattern to be well, the ignition and start-up and re-ignition,
And an ignition control circuit for switching to a controlled adjustment position in a two-position pattern selected after ignition, which is performed only in the M adjustment position. As a result, when the set temperature is input from the temperature setting dial 5, the two-position pattern corresponding to the temperature is selected from the above-mentioned three types of patterns and the signal is output, and the hot air temperature sensor TH is also output. The input temperature signal is compared with the set temperature to output a signal for switching between the positions of the selected two-position pattern, and the continuous operation time at each position reaches a fixed time. As a result, the pattern is switched to the pattern of two positions which are ranked higher or lower next. At this time, if the control condition selected by the set temperature set by the setting dial 5 is equal to or lower than the combustion state at the L adjustment position, the MOFF two-position pattern is selected to adjust the M adjustment. The combustion operation at the position and the digestion state, which is the OFF adjustment position, are switched alternately, and at that time, the combination of the duration of the combustion operation and the duration of the digestion state is selected. As a pattern, hot air is generated in a predetermined temperature range, and the control condition selected to adapt to the set temperature set by the setting dial 5 is
In the case of a two-position pattern of HM or ML, ignition / starting at that time is always performed at the adjustment position of M, and the HM or ML selected after ignition is selected.
In the two position patterns, the control position is returned to the H or L adjustment position instructed by the comparison circuit in the patterns, and control is performed by alternate switching from the adjustment position.

Reference numeral 7 is a valve control for turning on / off the fuel pump P, which is an electromagnetic pump, and the drive circuits for the electromagnetic valves 4 and 5 in accordance with the selected two-position pattern signal and switching signal output from the temperature control circuit 6. Circuit.

The embodiment apparatus configured as described above operates as follows.

If the start switch is turned on, the drive circuit for driving each operating mechanism and the temperature control circuit 6 are connected to a power source, and the hot air temperature to be generated by the temperature setting dial 5 is set to a desired value, the temperature control circuit 6 sets the setting. A two-position pattern adapted to the temperature is selected and output to the valve control circuit 7, and the burner device a is operated in that state, and the burner device a moves between the two adjustment positions of the selected two-position pattern. The hot air temperature sensor TH compares the temperature signal of the outside air temperature input to the temperature control circuit 6 with the set temperature set by the setting dial 5. .

That is, if the selected two-position pattern is the ML pattern, it means that only the solenoid valve 3 is open while the fuel pump P, which is the electromagnetic pump at the M adjustment position, is operating. , L and the solenoid valves 3 and 4 are both open while the fuel pump P is operating, and the two positions are alternated in comparison between the hot air temperature and the set temperature. It is controlled to switch.

In this control, when the pattern at the two selected positions is not adapted due to the fluctuation of the outside temperature and the state of M or L becomes continuous, the continuous state is set to the timer circuit as desired. By continuing for a time of, the pattern shifts to a pattern of two positions ranked next to the continuous position.

Then, in this control operation, when the condition selected by the set temperature set by the setting dial 5 is equal to or less than the combustion operation at the L adjustment position, M
When the two-position pattern of OFF is selected, the combustion operation and the fuel pump P are stopped when the fuel pump P, which is the adjustment position of M, is operating and only the solenoid valve 3 is open. And the non-combustion operation time is alternately switched, and the time of the combustion operation time and the non-combustion operation time is in accordance with a pattern selected from a plurality of patterns made by combining those times in a short and long time. Thus, the combustion operation is controlled so that hot air having a predetermined temperature can be obtained.

In addition, when a two-position pattern is selected and ignition / starting is performed under the control of the pattern,
Only the ignition start is inevitably performed at the M adjustment position.

As described above, in the method of the present invention, the lower limit adjustment is performed in the control for obtaining the combustion operation lower than the combustion operation at the L adjustment position, which is the lower limit adjustment position where the discharge amount of fuel oil is the smallest. A pattern of two positions of MOFF, which is a combination of the M adjustment position and the OFF adjustment position, which is one step higher than the position, is selected, and each time of M combustion operation and OFF non-combustion operation that are repeated alternately is selected. The combination of long and short of
Since the temperature of the generated hot air is controlled,
Even if the pump discharge pressure in the L combustion state is set low, and even if the OFF non-combustion state is combined, the combustion state lower than the L combustion state can be controlled without causing ignition failure. As a result, the adjustment range of the combustion state can be widened.

In addition, whatever the pattern of the selected two positions is, and the condition that the ignition / starting in the selected pattern of the two positions is performed by designating H or L. Also, since ignition / starting is always performed at the adjustment position of M, and after ignition, control is started according to the pattern of the selected two positions, so ignition start at the adjustment position of H with high pump discharge pressure. It is possible to effectively eliminate the inconveniences such as the generation of a large combustion noise and back combustion, and the ignition failure caused by the ignition / starting at the L adjustment position where the pump discharge pressure is low.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of conventional means, and FIG. 2 is a block circuit diagram of a control device used for carrying out the method of the present invention. Description of Drawing Symbols A ... Grain dryer, a ... Burner device 1 ... Nozzle, 2 ... Pipe, 20 ... Branch pipe 21/22 ... Return pipe 21a / 22a ... Throttle valve 3/4 ... Solenoid valve, 5 ... Temperature Setting dial 6 ... Temperature control circuit, 7 ... Valve control circuit P ... Fuel pump, T ... Fuel tank TH ... Hot air temperature sensor

Claims (2)

[Claims] 1. A high fuel supply to the burner device.
A setting that sets a plurality of two-position patterns consisting of a combination of two positions that are selected from a plurality of adjustment positions that change in stages such as medium / low / off, and sets the pattern from those two positions as desired A pattern suitable for temperature is selected by the temperature control circuit, and switching between the two positions of the selected two positions is performed by comparing the temperature signal of the hot air temperature sensor input to the temperature control circuit with the set temperature. By detecting the continuous time of the combustion operation at each of the switched positions and reaching the fixed time, the switching can be switched to the pattern of two positions ranked next to the position in the continuous state. In the control method of the burner device for hot air generation in the grain dryer, the following control of low combustion operation in which the fuel is supplied at a low amount and combustion is performed is performed. The pattern of the switching transition between the adjustment position where the supply amount of fuel is in the middle and the adjustment position where the supply amount of fuel is cut off is set as the pattern, and the time of the adjustment position where the supply amount is inside and the adjustment position where the supply amount is cut off A method for controlling a burner device for hot air generation in a grain dryer, which is characterized by performing a combination of long and short times. 2. A high fuel supply to the burner device.
A setting that sets a plurality of two-position patterns consisting of a combination of two positions that are selected from a plurality of adjustment positions that change in stages such as medium / low / off, and sets the pattern from those two positions as desired A pattern suitable for temperature is selected by the temperature control circuit, and switching between the two positions of the selected two positions is performed by comparing the temperature signal of the hot air temperature sensor input to the temperature control circuit with the set temperature. By detecting the continuous time of fuel operation at each of the switched positions and reaching the fixed time, the transfer is switched to the pattern of two positions ranked next to the position in the continuous state. In a method of controlling a burner device for hot air generation in a grain dryer, the method includes: a selected desired two-position pattern and a cut adjustment position. A grain is characterized in that the ignition start in the pattern of positions is carried out in the middle adjustment position, and after the ignition start is controlled to switch to the high adjustment position or the low adjustment position of the selected two position pattern. A method for controlling a burner device for generating hot air in a dryer.