JPH0322536B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method of controlling a burner device that generates hot air to be delivered to the shells as drying air in a shell dryer.

The burner device for generating hot air in the shell dryer detects the temperature of the generated hot air with a hot air temperature sensor and uses the detection result to maintain the temperature of the hot air sent to the shell at approximately constant. , to control the combustion operation of the burner device.

The combustion operation of this burner device is usually controlled by adjusting the amount of fuel supplied. As shown in FIG. A branch pipe 20 is connected to the pipe line 2 through which fuel oil is pumped by the fuel pump P, and return pipes 21 and 22 communicating with the fuel tank T are connected to the branch pipe 20 in parallel. are provided with throttle valves 21a and 22a that can adjust the flow rate as desired, and solenoid valves 3 and 4.
By selectively operating the solenoid valves 3 and 4 on and off, (1) the supply amount of all the fuel oil pumped by the fuel pump P to the nozzle 1 becomes H; (high) state, (2) A portion of the fuel oil pumped by the fuel pump P returns to the fuel tank T from one return pipe 21, and the amount of fuel minus this return amount is sent to the nozzle 1. (3) The fuel oil pumped by the fuel pump P is returned to the fuel tank T through the two return pipes 21 and 22, and the return amount is large. , a state in which a smaller amount of fuel is supplied to the nozzle 1 and the supply amount is L (low), and a means for adjusting the supply amount in stages.

The present invention is directed to a control method for controlling the combustion operation of a burner device that uses this stepwise means to adjust the amount of fuel oil supplied in accordance with the hot air temperature.

Therefore, the conventional control method based on the above-described fuel adjustment means creates four positions by adding an OFF state in which the fuel pump P is stopped to the H, M, and L states, and From among these, for example, patterns are set to alternately switch between two positions selected as desired, such as H and M, M and L, L and OFF, H and OFF, etc., and each of these patterns is set at a predetermined temperature. A suitable pattern is selected from among these patterns by comparing it with the set temperature set by the temperature setting dial, and the two positions of the selected pattern are set by the hot air temperature sensor.
This is done by comparing the hot air temperature signal detected by the TH with the set temperature and switching alternately. However, with this conventional method, the pattern to be selected becomes distorted due to changes in the outside temperature, so for example, when a pattern that alternately switches between M and L is selected, Since the state may continue for a long time or the L state may continue for a long time, a number of combinations of two positions selected from the four positions described above are created in response to changes in the outside temperature, and furthermore, the outside temperature sensor is provided, the pattern selected based on the set temperature is corrected by the outside temperature detected by this outside temperature sensor, and an adapted pattern is selected.

However, in order to control the selection from a large number of patterns by making corrections using the outside temperature sensor, processing must be performed using a microcomputer. Therefore, the conventional means described above complicates the control device. In addition, there is a problem in that the price increases due to the expensive microcomputer.

The present invention has been made to solve this problem, and allows accurate control of the combustion operation of the burner device in response to fluctuations in hot air temperature due to changes in outside temperature, without using an outside temperature sensor or a microcomputer. The purpose is to provide a control method that can be used to

Therefore, the present invention solves the problem of the continuation of the combustion state at one position of the selected two-position pattern, which occurs in the conventional control means, due to fluctuations in outside temperature. Since the condition can be a sensor that detects fluctuations in outside temperature, and the continuous condition is caused by the amount of fuel being supplied being either insufficient or excessive in relation to the set temperature, it is important to select By changing the current two-position pattern to a two-position pattern ranked higher or lower, a predetermined control operation that alternates between the two positions can be performed. It was completed.

For this reason, in the present invention, a plurality of two-position patterns are set, each consisting of a combination of two positions selected from among a plurality of adjustment positions that change the amount of fuel supplied to the burner device in stages. A temperature control circuit selects a pattern adapted to a desired set temperature from among the two-position patterns, and a hot air temperature sensor input to the temperature control circuit switches between each position of the selected two-position pattern. The continuous time of combustion operation at each switched position is detected, and when the continuous time reaches a certain time, the next position of the position in the continuous state is The present invention proposes a control method for a burner device for generating hot air in a grain husk dryer, which is characterized by controlling the burner device for generating hot air in a grain husk dryer.

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

FIG. 2 is a block circuit diagram of a control circuit of a control device for a burner device used in carrying out the present invention. In the same figure, TH is generated in burner device a as shown in FIG. 1 above. A hot air temperature sensor installed in a hot air supply path (air guiding path) provided in the shell dryer A to detect the temperature of the hot air, P is a pipe line 2 that supplies fuel oil to the nozzle 1 of the burner device a. 3 is a solenoid valve installed in a return pipe 21 connected to a branch pipe 20 connected to the pipe 2, 4 is a solenoid valve installed in the return pipe 22, and 5 is the above-mentioned electromagnetic pump. The temperature setting dial installed on the control panel provided on the outer surface of the shell dryer A is shown.

6 selects a 2-position pattern that adapts to the desired set temperature with the temperature setting dial 5, alternately switches between each position of the selected 2-position pattern, and selects the next ranked 2-position pattern. This is a temperature control circuit that switches patterns.
H←→M, M←→ set by a combination of two positions selected from the four adjustment positions of L and OFF
Three types of 2-position patterns, L, L←→OFF, are stored in the memory circuit, and the 2-position is determined by comparing the temperature signal input from the hot air temperature sensor TH with the set temperature set by the temperature setting dial 5. and two timer circuits for detecting the continuous operating time of each of the two positions in each pattern. Then, when the set temperature is input from the temperature setting dial 5, the two-position pattern that adapts to that temperature is selected from the three types of patterns described above, and that signal is output. A signal for switching between the two selected pattern positions is output by comparing the temperature signal coming and the set temperature, and when the continuous operation time for each signal reaches a certain time, the upper or lower temperature signal is output. It acts to switch to a two-position pattern ranked next to the lower one.

Reference numeral 7 denotes a valve control circuit that turns on and off the drive circuits of the electromagnetic pump P and 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.

Therefore, the control of the combustion operation of the burner device a according to the method of the present invention is performed in the following order. First, the temperature of the hot air to be generated is set as desired using the temperature setting dial 5, and the two positions corresponding to this set temperature are set. The pattern is selected by the temperature control circuit 6 and outputted to the valve control circuit 7, and the burner device a is operated in this state.

Then, the burner device a comes to operate by alternately switching between the two positions of the selected two-position pattern, and this switching is caused by the hot air temperature sensor.
This is done by comparing the temperature signal detected by the TH and input to the temperature control circuit 6 with the set temperature set in the temperature control circuit 6, and by alternately switching between two positions, the hot air within the specified temperature range is controlled to be generated.

That is, the selected two position patterns are M←→L
If the pattern is as follows, there will be a state where only the solenoid valve 3 is open while the electromagnetic pump P is operating, which is the adjustment position of M, and a state where the electromagnetic pump P is operating, which is the adjustment position of L. The controller is controlled to alternately switch between two positions, a state in which both the solenoid valves 3 and 4 are open, and a state in which both the solenoid valves 3 and 4 are open. More specifically, when the temperature signal input from the hot air temperature sensor TH to the temperature control circuit 6 is lower than the set temperature, the solenoid valve 4 opens and enters the state M, and the temperature signal input to the temperature control circuit 6 is lower than the set temperature. When the temperature is higher than the temperature signal, the electromagnetic valve 4 closes and enters the L state, and this operation is repeated to control the combustion operation of the burner device.

In this control, if the selected two-position pattern becomes inappropriate due to fluctuations in outside temperature and the L state continues, the continuous state will last for a certain period of time set as desired in the timer circuit. By continuing, the pattern is shifted to L←→OFF, which is the pattern of the second position ranked next to the consecutive positions, and the state of L, where the two solenoid valves 3 and 4 are open, and the solenoid pump P is stopped
The state is set to alternate between the OFF state and the two positions. Conversely, when the state of M becomes continuous, if this continuous state continues for a certain period of time, it will be ranked next to the continuous position.
The position pattern is shifted to the H←→M pattern, and the two solenoid valves 4 are in the M state in which they are open and the H state in which the two solenoid valves 3 and 4 are both closed. The position is switched alternately.

As explained above, the method for controlling the burner device in the shell dryer according to the present invention sets a plurality of combination patterns of two positions each from a plurality of adjustment positions that change the fuel supply amount in stages, and Select the 2-position pattern corresponding to the set temperature,
The operation of the burner device is controlled by alternately switching between the two positions of the pattern by comparing the hot air temperature and the set temperature, but due to fluctuations in the outside temperature, the selected pattern of the two positions does not adapt When combustion starts to occur continuously in one position, when the continuous time reaches a certain period of time, the pattern is switched to the next ranked 2nd position. The continuous state in one of the positions functions as an outside temperature sensor that selects an accurate pattern, so without using an outside temperature sensor,
Furthermore, the combustion operation can be accurately controlled using a two-position pattern using a simple control means that does not require an expensive microcomputer.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the conventional means, and FIG. 2 is a block circuit diagram of a control device used to implement the method of the present invention. Explanation of drawing symbols, A...Grain dryer, a...Burner device, 1...Nozzle, 2...Pipe line, 20...
... Branch pipe, 21, 22 ... Return pipe, 21a, 22
a... Throttle valve, 3, 4... Solenoid valve, 5... Temperature setting dial, 6... Temperature control circuit, 7... Valve control circuit, P... Solenoid pump, T... Fuel tank,
TH...Hot air temperature sensor.

Claims (1)

[Claims] 1 A two-position pattern consisting of a combination of two positions selected from among a plurality of adjustment positions that change the amount of fuel supplied to the burner device in stages,
A temperature control circuit selects a pattern suitable for the desired set temperature from among the two-position patterns, and inputs switching between each position of the selected two-position pattern to the temperature control circuit. By comparing the temperature signal of the hot air temperature sensor and the set temperature, and detecting the continuous time of combustion operation at each switched position, and when the continuous time reaches a certain time,
Ranked next to the position in the continuum 2
1. A method of controlling a burner device for generating hot air in a grain dryer, comprising controlling the burner device to switch and shift the position pattern.