JPH03217714A - Combustor control circuit - 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 Industrial Application The present invention relates to a control circuit for a combustor that controls combustion using a combustion sensor. Conventional technology A diagram of the control system of a conventional combustion machine is shown in Figure 2. In the figure, 1 is a heat exchanger, 2 is a burner, and 3 is a combustion sensor such as a flame rod for detecting combustion in the burner 2. Reference numeral 4 designates a combustion control unit that controls combustion in response to signals from a combustion sensor 3, etc., which includes a pulse bomb 5 that sends oil to the burner 2, a blower motor 6 that also sends combustion air, and an ignition device that performs ignition. 7 is connected.

On the other hand, 8 is an abnormal stop circuit that stops combustion if the combustion sensor cannot detect combustion for a certain period of time when igniting the burner 2, and 9 is a reset circuit that resets the abnormal stop state and starts combustion again. It is configured to be manually reset using the reset switch 10. With this configuration, if combustion does not occur smoothly due to some abnormality during ignition, the abnormality stop circuit 8 will operate to stop combustion, and from then on the user or service personnel will not have to consciously operate the reset switch 10. Otherwise, combustion would not start again. Problems to be Solved by the Invention However, in the above configuration, when the reset switch IO is repeatedly operated, the ignition operation is performed each time, so the pulse bomb 5 is operated for a predetermined period of time, and oil is supplied into the burner. Ru. As this progresses, oil may accumulate inside the burner 2 and the oil may flow out of the machine.

Furthermore, in the case of a vaporizing burner, the supplied oil is vaporized and the vaporized gas is filled with a very high concentration, and if the ignition happens to be successful in this state, there is a possibility that an explosive ignition will occur. be.

In addition, there are situations in which combustion is not detected during ignition, which can occur on a daily basis, such as when the oil tank runs out of oil, so there is the issue that it is not possible to create a configuration that does not allow manual reset simply for safety reasons. there were.

The present invention solves such conventional problems, and by counting the number of consecutive abnormal stops and disabling resetting after a predetermined number of times, it is possible to realize a control system that is easy to use and highly safe. With the goal.

Means for Solving the Problems In order to solve the above problems, a control circuit for a combustion machine according to the present invention includes a burner, a combustion control section that controls combustion of the burner, a combustion sensor that detects the combustion state of the burner, and a burner. an abnormality stop circuit that stops the ignition operation if the combustion sensor does not detect combustion after a certain period of time has elapsed from the start of the ignition operation; and a manual reset means that resets the abnormal stop state and starts the ignition operation again. The system is equipped with an abnormality counter that counts the number of consecutive occurrences of abnormal stoppage, and is configured such that manual reset cannot be performed when the counter value of the abnormality counter exceeds a predetermined number of times.

Operation The present invention has the above-described configuration, so that in the case of troubles that may occur on a daily basis, such as running out of fuel, it can be manually reset after the cause has been removed, and in the case of other abnormalities in the combustion system, it can be reset a predetermined number of times. After being reset,
Since manual reset is not possible, fuel does not accumulate in the burner to the extent that it becomes dangerous, and safe control can be achieved.

EXAMPLE Hereinafter, a control circuit for a combustor according to an example of the present invention will be explained based on the accompanying drawings. FIG. 1 is a control system diagram of a combustion machine according to an embodiment of the present invention. In the figure, l is a heat exchanger, 2 is a burner, 3 is a flame rod (combustion sensor) for detecting combustion in the burner 2, 4 is a combustion control unit that controls combustion in response to a signal from the flame rod 3, It is connected to a pulse pump 5 for supplying oil to the burner 2, a blower motor 6 for supplying combustion air, and an ignition device 7 for ignition.

On the other hand, 8 is an abnormal stop circuit that stops combustion if flame rotor 3 cannot detect combustion for a certain period of time when igniting burner 2, and 9 is a reset circuit that resets the abnormal stop state and starts combustion again. In the circuit, reset switch (
Manual reset means) 10 is configured to perform manual resetting. 11 is connected to the abnormal stop circuit 8,
This is an abnormality counter that counts the number of abnormal stops, and its output is connected to the reset circuit 9.

In the above configuration, the operation will be explained next. During normal operation, the combustion control unit 4 controls the pulse bomb 5, the blower motor 6, and the ignition device 7 to ignite the burner 2 and fire the flame rod 3.
detects ignition, stops the ignition device 7, and maintains the combustion state. On the other hand, if there is some abnormality in the combustion system, the flame rod 3 does not detect the ignition signal although the ignition operation is performed. When this state continues for a certain period of time, the abnormal stop circuit 8 operates, outputs a signal to the combustion control section 4, stops the pulse pump 5, and enters the abnormal stop state.

At the same time, this signal is transmitted to the abnormality counter 11, and the counter becomes rlJ. Here, abnormality counter 1
If you set the overflow of 1 to 2 times, for example,
The counter does not overflow yet. When the user noticed this abnormal stoppage and inspected it, he found that it was out of oil, and after replenishing the oil tank,
When the reset switch 10 is reset, the reset circuit 9 resets the abnormal stop state, and the combustion control section 4 enters the ignition sequence again.

This time, since oil is supplied, ignition is performed smoothly and normal combustion begins, and the counter value of the abnormality counter 11 returns from "1" to "0".

Next, if the cause is something other than running out of oil, the user will operate the reset switch 10 again without being able to find the cause even after checking.

Then, similarly, the engine recovers from the abnormal state and enters the ignition sequence again, but since the cause of the abnormality has not been removed, the abnormality stop circuit 8 operates again after a certain period of time and the engine stops. Then, the abnormality counter becomes "2".

Furthermore, if the reset switch is operated again, the same operation will be repeated and the error counter will be reset to "
3". At this point, the set value (twice) of the counter 11 is exceeded, so an overflow signal is generated and transmitted to the reset circuit 9, stopping the reset function. Therefore, even if the reset switch 10 is operated from now on, the abnormal state will not be recovered.

In fact, since the pulse pump 5 operated for a certain period of time without lighting a fire three times in a row, it can be expected that a considerable amount of oil has accumulated in the burner 2, and no more oil will be stored in the burner 2. If the reset is continued, oil may leak out of the equipment, or in the case of a vaporizing burner, the burner may be filled with highly concentrated vaporized gas, which may cause an explosion if it ignites. It is possible that

Effects of the Invention As described above, the combustion machine control circuit of the present invention provides the following effects.

(1) The number of consecutive abnormal stop occurrences is limited to a certain number of times, which may cause dangerous problems such as oil leakage outside the equipment or thick unburned gas filling inside the burner due to repeated abnormal resets. The situation can be avoided.

(2) Since it is possible to reset the engine at least once or twice, in the event of an abnormal stop due to burnout, it is easy to manually reset the engine.

Also, during test runs, etc., it is necessary to wait until the fuel is led to the equipment.
~2 abnormal stops may occur, and even in such cases, you can easily reset it manually.

[Brief explanation of drawings]

FIG. 1 is a control system diagram of a control circuit of a combustor according to an embodiment of the present invention, and FIG. 2 is a control system diagram of a conventional combustor. 1...Heat exchanger, 2...Burner, 3.
...Flame Rondo (combustion sensor), 4...
... Combustion control section, 8 ... Abnormal stop circuit, 10.
...Reset switch (manual reset means), 1
l...Abnormal counter.

Claims (1)

[Claims] a burner; a combustion control section that controls combustion of the burner;
a combustion sensor that detects the combustion state of the burner; an abnormal stop circuit that stops the ignition operation if the combustion sensor does not detect combustion after a certain period of time has elapsed from the start of the ignition operation of the burner; It is equipped with a manual reset means for resetting the state and switching to ignition operation again, and an abnormality counter that counts the number of consecutive occurrences of abnormal stoppage, and is configured such that manual reset is not possible when the counter value of the abnormality counter exceeds a predetermined number of times. control circuit for a combustion machine.