JPS6057129A - Combustion device - Google Patents

Abstract

PURPOSE:To facilitate judgement of abnormal causes and troubled portions and to improve a safety and maintenance substantially by a method wherein a stopped condition made by external causes and another stopped condition caused by internal causes are discriminated to each other. CONSTITUTION:Each of A and B is a stopped condition made by external causes and internal causes, respectively. 11 designates a short circuited condition of a thermistor, or short circuited condition of the associated, 2 indicates a breakage of thermistor wirings, 3 designates a continuous energization of a heater in reference to poor condition in the heater control circuit, 4 designates a breakage of heater caused by a poor condition of the heater control circuit and 5 indicates a short circuited condition of the associated wirings as well as adhesion of foreign matters to a flame sensor. In case that an operation is stopped due to internal causes, the operation display lamp is flahsed, in turn in case that the operation is stopped due to internal causes, each of the ventilation, fuel feeding and water sensing lamps is lit in response to each of the conditions of 1-5, thereby an abnormal condition or cause is indicated. The condition of the display lamp enables an abnormal condition or causes to be realized and thus the troubled portions can easily be and immediately be recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to combustion devices such as fan heaters and hot air heaters, and particularly relates to displaying the cause of operation stoppage.

(Prior Art) In general, a combustion device consists of mechanical parts such as a burner part that burns fuel, and an electrical control circuit part to ensure normal and safe combustion. A large number of safety devices are installed to prevent unexpected accidents.

This is because it is necessary to provide a large number of combustion-related safety devices that cannot be controlled, such as combustion itself or electricity.

For example, in the case of a vaporizing type 71 oil combustor, there is a vibration sensing device, an overheat detection switch for the burner section, an oxygen deficiency sensor, a fuel exhaustion sensor, and a water sensor →1. A safety device such as a fuse is provided, and when the operation is stopped due to activation of the safety device, the cause is displayed using a lamp as shown in FIG. 1 1- Is the Kianrei device Iso? : This function is used to prevent an accident if some external factor causes an abnormal condition in the equipment when the components that make up the equipment's circuit are operating normally.

However, in a combustion device, in addition to the above-mentioned external factors, abnormal conditions naturally exist due to damage, short circuit, etc. of the circuit components themselves that control the operation of the device. For example, there is a case where the temperature of the vaporizer falls outside a predetermined temperature range due to a heater break or a thermistor being damaged. Such an abnormality is a much more serious problem than one caused by external factors, and is the most difficult failure for users to understand. There wasn't. At best, the operation was stopped due to an abnormality based on the cause described in 1 above, and at the same time the lamp corresponding to the operation shown in Fig. 1 was not turned on.

Therefore, the user assumes that the operation has stopped due to mere overheating and resumes operation after a while, but no matter how many times he tries, the operation ends up stopping. Only when you repeat this kind of thing will you realize that you have an internal breakdown.

In such cases, simply by repeatedly starting and stopping the operation,
If no other abnormality occurs, there will be no problem since the failure will be recognized as a result of broken parts, but in the following cases, for example, an abnormality will occur in the pond, which will be very inconvenient.

That is, as shown in Fig. 2, if the temperature of the vaporizer does not reach the preheating completion temperature T1 within 18 hours after the start of operation, or -.
After the temperature of general vaporization 2B7 reaches r heat completion temperature T1, 1
- limit) When the temperature exceeds 11 degrees T11 or falls below the lower limit temperature Tl, the operation is stopped. , In the second case, short circuit of thermistor, temperature detection 'A
:) Even if an abnormality has occurred, when starting operation,
Vaporizer temperature is preheated) Opening degree T, l; Jto and 1'1
If the actual carburetor iQ degree is outside the stable combustion range, in other words, it is outside the +/lower limit set temperature, the ignition operation will start if there is a disconnection. cause problems.

In this way, operation stoppage due to internal factors such as damage to circuit component white wood, etc. 1. It is extremely important to display this information separately from operation stoppages due to water pollution in terms of safety and serviceability for this fuel control device.

The abnormal conditions associated with 1-1 internal factors are not only those related to -, but also include the following.

If the heater is continuously energized due to an abnormality in the heater or the control circuit, there is a risk that the vaporizer temperature will exceed the set temperature Tl+. Furthermore, flame detectors such as flame ronds are generally used to check the ignition and combustion conditions, but if an abnormality such as a foreign object is present between the electrodes or a wiring short circuit occurs before the ignition operation, As shown in FIG. 3, the flame resistance reaches the ignition level at the same time as the ignition operation, and the igniter does not discharge and fuel is ejected without being ignited.

(Object of the Invention) Therefore, it is an object of the present invention to provide a combustion device that displays an operation stoppage due to an internal factor in a manner that distinguishes it from an operation stoppage due to an external factor.

Another object of the present invention is that when the operation is stopped due to internal factors,
An object of the present invention is to provide a combustion device that distinguishes and displays the types of internal factors.

In addition, in the embodiment, a new device for detecting internal factors in advance will be presented.

(Example) Hereinafter, the combustion apparatus of the present invention will be explained in detail with reference to the illustrated example.

4- In controlling the opening degree of the carburetor, stopping the operation of the heater 1-
The range was set as shown in FIG. 4, and the operation was stopped 1- when the temperature of the vaporizer exceeded the -limit temperature Tl+ at the same time as the start of operation. As a result, in the case of a short circuit in the thermistor, etc., the engine does not stop or start ignition at the same time as the start of operation, and problems such as fuel leakage and abnormal combustion do not occur. Furthermore, even if the heater is continuously energized, it will stop at the set temperature of 1, so there will be no abnormal heat burning.

FIG. 5 is a flowchart showing the operation of controlling the temperature of the vaporizer.

In the figure, when the operation is first started, the temperature of the vaporizer is -
After confirming that the temperature is below the limit temperature Tll, electricity to the heater is started, and the vaporizer temperature T reaches the preheating completion temperature ゛1゛1 within the preset heater preheating time range 1a. When this is confirmed, if the temperature of the vaporizer is not lower than '1' or the preheating completion temperature T1, the heater is continued to be energized. Next, the vaporizer temperature 1゛ is the preheating completion temperature T1
If the temperature exceeds the above, return the timer time 1 to (), move to ignition operation, operate the fuel supply pump to start combustion, and check that the temperature T of the carburetor does not exceed the upper limit temperature TI, and preheating is completed. After that, combustion is continued while checking whether the predetermined time tb has elapsed and whether the temperature T of the vaporizer has not fallen below the lower limit temperature TI. At this time, if the temperature T of the vaporizer exceeds the limit temperature Tll after the start of operation, a short circuit in the thermistor or a short circuit in related wiring is displayed and the operation is stopped. Furthermore, energize the heater,
If the preheating completion temperature T1 is still not reached even after the preheating time La has elapsed, an indication that the heater wiring or thermistor wiring is broken is displayed and the operation is stopped. Next, in the combustion state, if the temperature T of the carburetor exceeds the upper limit temperature T11, a display indicating that the heater is continuously energized due to a defect in the heater control circuit or the like is displayed and the operation is stopped. When the temperature T of the vaporizer falls below the lower limit temperature TL, a display indicating that the heater control circuit is defective or the heater is disconnected is displayed and the operation is stopped.

Next, in controlling the flame detector, a failure range is set as shown in Figure 6, flame resistance is detected in advance during preheating or before ignition operation, and this value is greater than or equal to a preset failure level. When the time comes, I stop driving. Due to this,
The problem of fuel spewing out without ignition does not occur.
You can check for any abnormalities in the flame detector in advance.

FIG. 7 shows a schematic block diagram of a control device for a combustion device according to the present invention. The power supply circuit 1 is for supplying a predetermined power to a microcomputer 2, a display lamp 6 consisting of one unit, a load 5, etc. as in the conventional device. 7, water detection sensor 8, frame sensor 9, room temperature thermistor 1
0, Carburetor → J- Analog input capo to read analog signals from mister 11, etc. [8 and switch, 1: ON from moonquake/overheating switch 12, refueling switch 13, operation switch 14, etc., Or “r” signal In other words, digital input port I that reads digital signals
The power supply circuit 1 has an output port 01 that sends a control signal to the loads 5 such as the pump 15, the heater 16, the convection fan 17, and the igniter 18, and an output port 02 that sends the control signal to the indicator lamp 6. Power is supplied from the power supply terminal V.

The pump 15 is also connected to the output port 01 of the microcomputer 20 via a pump circuit 20.

The heater 16 is connected to a driver 24 through a heater circuit 21, the convection 7-amp 17 through a relay 22, and the igniter 18 through a relay 23, and the driver 24 is connected to an output port 01 of the microcomputer 2. Timer 19 is controlled by clock pulses from microcomputer 2.

Next, the operation of the control device will be explained with reference to the flowchart shown in FIG. First, when the operation switch 14 is turned on, the operation lamp of the display lamp 6 is turned on and the timer 19 is turned on.
Start counting. Next, the thermistor temperature T and the upper limit temperature Tll are compared, and the flame resistance Rf and the failure level RI+ are compared, and if T>Tll or Rf<R11, a display is made and the operation is stopped. T≦TH and Rf≧R11
Turn on the power supply circuit 8- and start energizing the heater. If the thermistor temperature T exceeds the preheating completion temperature ``1'' within a preset time 1a, a display is displayed and the operation is stopped.If the thermistor temperature T exceeds the preheating completion temperature T1 within time 1a, After setting the timer 19 to 0, turning on the pump circuit 20 and operating the pump 15,
The relay 23 is turned on and the igniter 18 is activated. Then, the flame resistance l(f becomes 1 or less than the ignition level R1).
), when the ignition range is reached, the relay 23 is turned OFF,
Stop the igniter 1), turn on the relays 2 and 1, and operate the convection fan 17. After that, continue combustion while monitoring the thermistor temperature ゛I゛ and moxibustion resistance Y (r). If the state of Tll or T<TI, Rf>R2 is reached, it will be displayed directly and the operation will be stopped.In this way, the control device transmits the information from the detector 3 to the control circuit,
Here, the microcomputer 2 receives the information and operates the load 5 according to the respective state, and if an abnormality occurs, an indicator lamp is immediately displayed and the operation is stopped.

Furthermore, by using the display means as shown in Fig. 9, it is easy to judge whether the stoppage is due to an external factor or an internal factor using only four lamps, as in the conventional example. becomes. Further, as shown in FIG. 10, in the case of a stoppage due to an internal cause, by lighting indicator lamps for each cause of the failure, the location of the failure can be immediately known and repairs can be made easily.

Note that A and B shown in FIGS. 9 and 10 respectively indicate A: stoppage due to external factors, and B: stoppage due to internal factors. Also, the symbols ○ and ■ are respectively ■: blinking, ○: lit,
◎: Indicates that the light is off.

A detailed explanation of each state in FIG. 8 and FIG. 1() is as follows:
It will look like this:

In Fig. 5, Fig. 8, and Fig. 10, the state of x1...thermistor short-circuit or related wiring short-circuit, the state of x2 - discharge
Disconnection of the evening wiring or thermistor wiring, same *3 condition...Continuous energization of the heater due to a defect in the heater control circuit, heater disconnection due to a disconnection, Figures 6 and 3; Figures 10, ×5 Condition: 111 Foreign object has arrived at the flame detector or short circuit in related wiring.In normal cases, the ventilation, refueling, and water detection indicator lamps are blinking.

1] In the case of the display means shown in the figure, if the operation is stopped due to an external factor, the operation indicator lamp will blink as shown in the figure, and if the operation is stopped due to an internal factor, ventilation, refueling, water supply, etc. The indicator lamp for each detection lights up. l: The sea urchin is turning.

In addition, when the display means shown in Fig. 10 is used, the driving indicator lamp blinks in the same way as the display means shown in Figs. 1 and 1j when the vehicle is stopped due to external factors. , If the operation is stopped due to an internal cause, the ventilation, refueling, and water detection lamps will be turned on in accordance with each of the conditions listed in *1 to *5 to notify the cause of the abnormality. That's what I do. If the cause of x1 above occurs, use a ventilation lamp, x2
If the cause is caused by x4, turn on the refueling lamp; if the cause is x3, turn on only the 11-water detection lamp, and if the cause is x4, turn on the ventilation lamp and fuel lamp; In such cases, the fuel supply lamp and water detection lamp are turned on, and the other lamps are turned off. As a result, if it is specified somewhere that the cause of the abnormality is (LIR) depending on the state of the indicator lamp, the faulty part can be repaired immediately.

Note that the display state of the display lamps is not limited to the embodiments shown in FIGS. 9 and 10.

(Effects of the Invention) With the above-described configuration and operation, the combustion apparatus of the present invention is capable of stopping due to external factors such as earthquakes, heater overheating, or running out of fuel.
・Distinguish and display stoppages due to internal causes such as failures of components or circuits, or display the cause of stoppages due to internal factors in more detail by changing the lighting status of the indicator lamp depending on the cause of the abnormality. By displaying the information, it is possible to easily determine the cause of the abnormality and the location of the failure, which has the extremely beneficial effect of greatly improving safety and maintainability.

[Brief explanation of the drawing]

=12- Fig. 1 is a diagram showing a conventional abnormality display means, Fig. 2 is a diagram showing a conventional temperature control state of a vaporizer, Fig. 3 is a diagram showing a conventional flame detector control state, and Fig. 4 is a diagram showing a conventional flame detector control state. 6 to 6 show an embodiment of the combustion apparatus of the present invention, FIG. 4 is a diagram showing an embodiment of the temperature control state of the carburetor of the present invention, FIG. 5 is a flowchart showing the same operation, and FIG. 7 is a block diagram showing the configuration of the control device of the present invention, FIG. 8 is a flowchart showing the operation of the control device of the present invention, and FIG. 9 is a diagram showing the control state of the flame detector of the present invention. FIG. 10 is a diagram showing one embodiment of the abnormality display means of the present invention. FIG. 10 is a diagram showing another embodiment of the abnormality display means of the present invention. 1...Power supply circuit 2...Microcomputer 3.
...Detector 4...Switch 5...Load 6...Indicator lamp

Claims (1)

[Claims] In combustion equipment that is configured to stop operation based on the activation of a safety device in response to abnormal conditions caused by external factors such as earthquakes and fuel shortages, disconnection, short-circuiting, or A detection means for detecting an abnormal state due to damage, etc., an operation stop means for stopping operation based on the output of the detection means, and an internal display for displaying this operation stop to distinguish it from an operation stop due to the activation of the safety device described above. A combustion device comprising factor display means.