JPS63201423A - Combustor heater control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heater control device for a combustor such as an oil fan heater.

Conventional Technology Generally, this type of heater control device is equipped with a heater for heating the vaporizer cylinder and a temperature detection element for detecting the temperature of the heated vaporizer cylinder, and the temperature detection element is provided to detect the temperature of the heated vaporizer cylinder. The heater is controlled to maintain the appropriate temperature for vaporizing the fuel.

For example, in a heater control device, as shown in Figure 3, a voltage divided by a resistor 1 and a temperature detection element (negative characteristic thermistor) 2 is connected to the inverting inputs of comparators 3 and 4, while a DC voltage 5 is connected to a resistor. A voltage divided by 6,7°8 is connected to each non-inverting input. The outputs of the comparators 3 and 4 are input to a controller (microcomputer) 9, and the controller 9 turns the transistor 10 to 0N based on the signal.
10FF to drive the heater energization relay 11 and control the heater 12.

The operation of the heater control device configured as described above will be explained below. When the temperature of the gold vaporization cylinder is lower than a predetermined temperature, the resistor 1 and the temperature detection element 2
The voltage VTH obtained by dividing the DC voltage 6 by the resistors 6, 7, and 8 becomes higher than the voltage VON obtained by dividing the DC voltage 6 by the resistors 6, 7, and 8. Therefore, the outputs of comparators 3 and 4 are “L”
Then, a signal is given to the controller 9 to turn on the heater, and the controller 9 turns on the transistor 10, operates the relay 11, and energizes the heater 12.Next, the temperature of the vaporizer cylinder is higher than a predetermined temperature. If V 7 H<
V OF F (heater off voltage). Therefore, the outputs of comparators 3 and 4 become "H", and a signal to turn off the heater is given to the controller 9, which turns off the transistor 10, stops the operation of the relay 11, and turns off the heater 12. 13 is a fuel pump,
14 is an igniter, 15 is a burner fan, and 16 is a blower fan.

Problems to be Solved by the Invention However, in the conventional configuration described above, the controller 9 goes out of control for some reason during combustion, or the temperature detection element 2 breaks down, resulting in an intermediate resistance value, that is, VTH is always lower than the VON level. If the level reaches a high level, the heater is turned on.
L, the temperature of the vaporizer cylinder continues to rise abnormally, resulting in an extremely dangerous situation.

The present invention solves the above-mentioned conventional problems and aims to improve safety by limiting the time during which the heater is continuously energized.

Means for Solving the Problems In order to solve the above problems, the combustor heater control device of the present invention limits the heater energization time so that the heater is not continuously energized for more than a certain period of time, and A safety section is provided to forcibly stop the supply of electricity to the heater in the event that the heater is energized in excess of the above.

Effect: The present invention provides a highly safe combustor that can avoid a dangerous situation where the heater continues to be energized even if the temperature detection part of the combustor fails for some reason due to the above configuration. Can be done.

Embodiment Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. Parts that are the same as those of the conventional example will be given the same numbers and the explanation will be omitted, and only the different parts will be explained. In FIG. 1, the controller 9 The control unit 17 mainly includes a timer unit 18 that starts time counting when the heater 12 is turned on, and a safety unit that stops energizing the heater 2 and issues an alarm when the time count of the timer unit 18 reaches a predetermined value. 19 is connected. The timer section 18 is a capacitor 20
and a resistor 21, an inverter 22, a gate 23.24, a resistor 25.28, and a transistor 27.28.
, an alarm means 29, and a relay 30.

In the above configuration, if the temperature detection element 2, heater 12, etc. of the combustor are now normal, the temperature of the vaporization cylinder is
When the N level is reached, the output 01 of the controller 9 becomes H, and the heater ON signal is sent to the input 2 of the gate 24, gate 2.
An H signal is given to the input 2 of 3 and the capacitor 20 of the timer section. When the heater energization time is within the safety time TON and is normal, H is input to input 1 of the gate 24 and input of the inverter 22, and the output of the gate 24 becomes H, causing the transistor 28 to operate the ONL relay 30 and supplying the heater 12. Turn on electricity. In this case, the output of the inverter 22 becomes L, so the output of the gate 23 becomes L, and the transistor 27 becomes O.
The alarm means 29 does not operate with FF. Next, if the temperature detection element 2 of the vaporizer cylinder fails and the output 01 of the control unit 9 continues to be H, the level of the timer output VON becomes L after the safety time TON, and the input 1 of the gate 24 and the inverter 22 An L signal is input to the input. Therefore gate 24
Since the output becomes L and the transistor 28 is turned off, the relay 30 is not activated and the heater 12 is not energized.

At the same time, the output of the inverter 22 becomes H, so the output of the gate 23 becomes H, turning on the transistor 27 and turning on the alarm means 29 to notify that there is an abnormality in the equipment. In this way, even if the controller 9 goes out of control and continues to output the heater ON signal, the timer unit 18 prevents the heater from being energized for more than the safe time TON, greatly improving safety. .

FIG. 2 is a sequence diagram showing the operation when the function of the timer section 18 explained in the above embodiment is incorporated into the microcomputer constituting the controller 19, and the hardware circuit is similar to the conventional example shown in FIG. becomes.

The operation of the embodiment when this software is compatible will be explained below with reference to FIG. 2. In Figure 2, first step 3
In Step 1, it is determined whether the current temperature of the vaporizer cylinder has reached the OFF level, and if it has reached the OFF level, the timer is reset in Step 32, and in Step 33, the heater 12 is turned off, and the process proceeds to normal sequence 34. Next, if the heater 12 has not reached the OFF level, step 35
It is determined whether the heater 12 is currently on. If the heater 12 is on, it is then determined in step 36 whether or not the timer has timed up. If the timer has timed up, the heater 12 is turned on in step 37. 0FF
L. Inform the abnormality in step 38. If the timer has not timed up in step 36, normal sequence 3
Proceed to step 4.

If the heater 12 is not turned on in step 35, it is determined in step 39 whether the temperature of the vaporizing cylinder is at the heater ON level, and if the heater 12 is not at the heater ON level, the process proceeds to normal sequence 34. Next, if the heater ON level has been reached, the heater 12 is turned on in step 40, a timer is started in step 41, and the process proceeds to the normal sequence 34.

If the temperature detection device of the combustor is currently malfunctioning and the heater always reaches the ON level, the timer times up in the determination at step 36, so there is no longer any inconvenience such as the heater 12 continuing to be energized.

Effects of the Invention As described above, according to the combustor heater control device of the present invention, if the temperature detection element of the vaporizer cylinder malfunctions for some reason, or if the controller goes out of control due to electrical noise, the heater ON signal is always output. Be sure to turn the heater to 0 even if
FFL abnormalities can be notified, and the safety is extremely high.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a heater control device in one embodiment of the present invention, and FIG. 2 is a sequence diagram in the same embodiment.
FIG. 3 is a circuit diagram of a conventional heater control device. 2... Temperature detection element, 12... Heater, 17... Control section, 1 day... Timer section, 19... Safety section . Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
figure

Claims (1)

[Claims] It includes a heater that heats the vaporizing section, a temperature detection element that detects the temperature of the vaporization section, and a control section that controls energization of the heater based on the output from the temperature detection element, and the control section controls the energization of the heater. A heater control device for a combustor, which has a timer section that starts a time count from , and a safety section that stops energizing the heater and issues an alarm when the time count of the timer section reaches a predetermined value.