JPS602437Y2 - Automatic control device for oil-burning appliances - Google Patents

Description

[Detailed description of the invention] This invention aims to provide an automatic control device for oil-burning appliances that burns fuel as vaporized gas in a vaporizer and performs the process from ignition to combustion reliably, safely, and automatically. .

Next, to explain the embodiment of this invention shown in Fig. 1, A is a combustion circuit of a combustion device that completely burns petroleum by gasifying it with a vaporizer (not shown), etc., and draws petroleum from a storage source and vaporizes it. A combustion control circuit 2 is connected in series with a fuel supply device 1 such as an electromagnetic pump that supplies the fuel to the fuel tank, and controls the fuel supply device 1 to adjust combustion. ), an igniter 4 which is provided in the combustion section in parallel with the solenoid valve 3 and is powered by a high-voltage transformer and an electrode that generates a spark and ignites the vaporized gas; a fuel supply device 1; It consists of an electric heater 5, etc., which is provided in the vaporizer in parallel with a solenoid valve 3, an igniter 4, etc., and generates heat when energized to gasify oil, and is equipped with a power lamp 6 on the side closest to the power source E. A power switch 7 is connected in series with each part, B is the commercial voltage 10 of the combustion circuit A on the primary side.
This is a control circuit that controls the combustion circuit A connected to the secondary side of the voltage drop transformer 8 that lowers 0V to about 12V on the secondary side. The voltage circuit 9 and the temperature of the vaporizer are detected, and the first relay 10 is energized when the temperature is below the set temperature of 230°C, and the normally open first relay switch 10a connected in series with the electric heater 5 is closed. a heater control circuit 11 that cuts off the power to the first relay 10, opens the first relay switch 10a, stops the power supply to the electric heater 5, and always maintains the vaporizer at a constant temperature of 23°C; Similarly, the temperature of the vaporizer is detected and the set temperature is 303.
When the temperature is below 'C, the second relay 12 is de-energized, and when it is above 303 degrees Celsius, the second relay 12 is energized and the normally open second relay switch 12a connected in series with the fuel supply device 1, solenoid valve 3 and igniter 4 is closed. At the same time, a normally closed second relay switch 12b provided in its own circuit (described later) is opened, a normally open second relay switch 12c is closed, and the set temperature is changed to 170° C. or higher. The second relay 12 is energized and the second relay 12 is de-energized at 170° C. or below, and the normally open second relay switch 12d is closed to operate the control circuit after this circuit. Safety circuit 1
3. It is controlled by a second relay switch 12d that is closed by the operation of the delay and safety circuit 13, and has a flame detection function, and is connected in series between the power switch 7 and the power lamp 6 when there is no flame in the combustion section. The normally-closed safety switch 14 is opened to stop energization of all circuits, and when there is a flame, the third relay 15 is energized after a certain period of time has passed since the second relay switch 12d is closed, and it is connected in series with the igniter 4. Connected normally closed third
The relay switch 15a is opened to stop the power supply to the igniter 4, and the normally open third relay switch 15b provided in the heater control circuit 11, which will be described later, is closed to activate the heater control circuit 11 and the second relay Connect in parallel with switch 12d.

The normally open third relay switch 15c is closed, and the ignition/flame control circuit 16 and the like forming a self-holding circuit are controlled.

Next, a heater control circuit 11, a delay/safety circuit 13, and an ignition/flame control circuit 1 according to an embodiment of this invention are shown in FIG.
6, 17 is the capacitor 1 on the input side.
8 and a coil 19 are connected to each other, the first micro-element circuit performs oscillation and amplification and converts the direct current into a high frequency signal, and 20 is a first temperature detection circuit that receives the high frequency signal from the micro-element circuit 17 via the third relay switch 15b. A coil (not shown) is wound around a magnetic material (not shown) such as ferrite, and when the temperature is low, the permeability of the magnetic material that controls the magnetic field of the coil increases, making the magnetic field stronger and making it difficult for high frequencies to pass through. On the other hand, when the temperature is high, the permeability of the magnetic material is small, weakening the magnetic field bow and making it easier for high frequencies to pass through.Using this property, the temperature of the vaporizer is detected, allowing high frequencies to pass at temperatures above the set temperature of 230 degrees Celsius, and not passing below this temperature. Unlike conventional temperature detection elements such as thermistors, this temperature sensor has characteristics such as no variation in product operating temperature, small differential (ON, 0FF), and semi-permanent life. are, 21
is an IC that connects one of the inputs between the capacitor 22 and the eleventh microelement circuit 17, connects the other to the first microelement circuit 17, compares the voltage difference between both sides, and outputs when a certain voltage difference is reached. The first comparison conduction element such as a comparator
When the temperature detector 20 detects the vaporizer temperature of 230°C or lower and does not pass high frequency, a constant voltage difference is output, and when it detects 230°C or higher and high frequency is passed, no constant voltage difference is generated and no output is made. The output of the first comparison conduction element 21 is connected to the base side by a conductive transistor, and the output side of the first comparison conduction element 21 is equipped with a capacitor 24 for stabilizing operation, and the collector side is connected to the above-mentioned transistor via a resistor 25. 1
A parallel circuit of a relay 10 and a diode 26 is connected, and the heater control circuit 11 is configured by the first micro element circuit 17, the first temperature detector 20, the first comparison conduction element 21, the transistors 2 and 3, etc. 27 is a capacitor 28 and a coil 29 on the input side.
30 is a second temperature detector which receives the high frequency from the second micro element circuit 27 via the second relay switch 12b. The properties and characteristics are the same as the first temperature detector 20, which detects the temperature of the vaporizer and passes high frequency waves above the set temperature of 303C and does not pass below this temperature. A third temperature detector is connected in parallel with the second temperature detector 30 so as to receive the high frequency from the element circuit 27, and has the same structure, properties, and characteristics as the first and second temperature detectors 20 and 30. It detects the temperature of 170'C or more of the set temperature and passes the high frequency signal and does not pass it below this temperature. 32 connects one of the inputs between the capacitor 33 and the second micro element circuit 27, and connects the other side to the second micro element circuit 27. When the second relay switch 12b is closed, a second comparison conduction element such as an IC-based comparator is connected to the micro element circuit 27 and compares the voltage difference between both open sides and outputs an output when a certain voltage difference is reached. is the second temperature detector 3
0 detects the vaporizer temperature of 303°C or less and does not pass high frequency, it does not output a constant voltage, detects 303C or more, and passes high frequency, it outputs a constant voltage difference and the second relay switch 12b opens. When the second relay switch 12c is closed, the third temperature detector 31 detects the vaporizer temperature at 170°C.
When it detects the following and does not pass high frequency, it does not output a constant voltage, and when it detects 170°C or more and passes high frequency, it outputs a constant voltage difference, 34 is the second comparative conduction element 32
The receiver is a transistor that conducts based on the output of the second comparison conduction element 32. The output side of the second comparative conduction element 32 is equipped with a capacitor 35 for stabilizing operation, and the collector side is connected to the second relay 12 and a diode 37 in parallel via a resistor 36. The circuit is connected to the second micro element circuit 27, the second and third temperature detectors 30, 31, and the second comparative conduction element 3.
2, a transistor 34, etc., constitute a delay/safety circuit 13.

38 is a capacitor 39 and a diode 4 for stabilizing operation.
0 is connected to the timer/flame detection circuit, which has a flame detector (not shown) such as a flame rond located in the combustion part, detects the presence or absence of a flame, and when there is no flame, outputs an abnormal output and directly connects the safety switch 1.
4 to stop additional energization of combustion circuit A and control circuit B, and when the presence of flame is detected, normal output occurs 11 to 14 seconds after energization is announced. Reference numeral 41 denotes a transistor which becomes conductive upon receiving the normal output of the timer/flame detection circuit 38. The timer/flame detection circuit 38 and a voltage-responsive switching element 4゜2 such as SBS are connected to the base side, and the resistor 43 is connected to the collector side. A parallel circuit of the third relay 15 and the diode 44 described above is connected, and the timer/flame detection circuit 38, transistor 41, etc. constitute the ignition flameless control circuit 16.

This invention is constructed as described above. Next, an embodiment of this invention will be described. When all the power switches 7 are closed, the combustion circuit A and the voltage drop transformer 8 are connected via the safety switch 14. conduction to the control circuit B, the power lamp 6 lights up, and the heater control circuit 11 in the control circuit B is energized in a summer manner, causing the first micro element circuit 17 to emit high frequency waves and try to supply them to the first temperature detector 20. However, since the third relay switch 15b is in the open state, the high frequency does not pass as in the case when the vaporizer temperature is 2300 or higher, so the first comparison 4 conduction element 21 outputs an output, the transistor 23 conducts, and the first relay 10 conducts and the first relay The switch 10a is closed, the electric heater 5 is energized, and the vaporizer is heated. Also, the delay and safety circuit 13 is energized, and the second micro element circuit 27 also emits a high frequency signal via the normally closed second relay switch 12b. 2 temperature detector 30, but since the vaporizer has just started heating, the temperature does not rise and is below 303°C.
The temperature detector 30 does not pass high frequencies and the second comparative conduction element 32
is not output and the second relay 12 is not energized. Therefore, the second relay switches 12a to 12b remain as they are and the fuel supply device 1 is not energized.
The solenoid valve 3, the igniter 4, the ignition flameless control circuit 16, and the third temperature detector 31 are not energized and do not operate, and only the electric heater 5 continues to be energized to increase the vaporizer temperature. When the vaporizer temperature reaches 303c or more, the second temperature detector 30 detects this and passes high frequency to output the second comparison conduction element 32, making the transistor 1 sister 34 conductive and energizing the second relay 12. So the second
When the relay switch 12a closes, the fuel supply device 1, solenoid valve 3, and igniter 4 are energized, supplying oil to the carburetor, gasifying it, supplying it to the combustion section, and igniting it with the spark generated by the igniter 4 to start combustion. The ignition flameless control circuit 16 is energized by the second relay switch 12d, which is started and closed at the same time, and the timer/flame detection circuit 38 first detects the presence of flame with the flame detector and switches the safety switch without outputting an abnormality. After 11 to 14 seconds have elapsed from energization with 14 in the closed state, the transistor 41 becomes conductive, energizes the third relay 15, opens the third relay switch 15a, and fires the igniter 4.
and the second relay switch 12d.
Closes the third relay switch 15c in parallel with the igniter 4 to keep the igniter 4 open at all times by self-holding.Furthermore, by closing the third relay switch 11 of the third relay 15, the first temperature of the heater control circuit 11 is maintained. A high frequency is supplied to the detector 20, and the first temperature detector 20 detects that the vaporizer temperature has just reached 303'C, which is higher than 230°C, so the first comparison conduction element 21 stops outputting through the high frequency, and the transistor 23 is not conductive, the first relay 10 is not energized, and the first
The first temperature detector 20 opens the relay switch 10a to stop the electricity supply to the electric heater 5 and stop heating the vaporizer, and the vaporizer temperature gradually decreases to 230°C or less.
detects this, and the first comparative conduction element 21 outputs an output without passing the high frequency, which makes the transistor 23 conductive, energizes the first relay 10, closes the first relay switch 10a, and energizes the electric heater 15 again, turning on the vaporizer. At the time of ignition, the vaporizer temperature is set to a high temperature of 303°C by the second temperature detector 30, and gasification is instantaneously performed. The temperature detector 20 maintains the vaporizer temperature at 230°C, and when the second relay 12 is energized, the second relay switch 12b in the delay and safety circuit 13 opens and the second relay switch 12c closes. Therefore, the temperature detection by the second temperature detector 30 is switched to the temperature detection by the third temperature detector 31, and the vaporizer temperature is always kept at 2 by the first temperature detector 20.
Since the temperature is maintained at 30° C., the third temperature detector 31 always passes high frequency to the second relay 12 and keeps the second relay switch 12a closed to continue combustion. In the event of an abnormality, such as when the vaporizer temperature drops below a certain temperature, the third temperature detector 31 detects that the vaporization temperature is below 170 degrees Celsius, stops the energization of the second relay 12 without passing high frequency, and turns on the second relay switch 12a. The fuel supply device 1 is opened and the operation of the fuel supply device 1 is stopped to stop the oil supply to the carburetor, and the operation of the solenoid valve 3 is also stopped to stop the vaporized gas in the carburetor from being supplied to the combustion section and instantly stop combustion. Furthermore, since there is no flame due to this combustion stop, the ignition flameless control circuit 16 is energized via the third relay switch 15c, and the timer/flame detection circuit 38 detects this and outputs an abnormal output to open the safety switch 14. electric heater 5
Of course, the power supply to all circuits is stopped to notify the failure of the carburetor and to prevent abnormal combustion due to the abnormally low temperature of the carburetor.

As described above, this invention operates.According to this invention, the first temperature detector 20 is provided for detecting the temperature of the vaporizer that uses the electric heater 5 as a heat source to vaporize fuel. a heater control circuit 11 comprising a first relay 10 that controls a normally open first relay switch 10a which is energized or deenergized depending on the temperature detected by the sensor 20 and has an electric heater 5 connected in series;
a second temperature detector 30 for detecting a vaporizer temperature higher than 0;
and a normally open type second relay switch 12a which is energized or de-energized depending on the temperature detected by the second temperature detector 30 and connected in series with the fuel supply device 1, igniter 4, etc.
and a delay/safety circuit 13 comprising a second relay 12 that controls a normally closed second relay switch 12b connected in series with the second temperature detector 30, and a normally open second relay of the second relay 12. It is equipped with a timer/flame detection circuit 38 which is energized via the switch 12d and outputs an output after a certain period of time after energization, and is a normally closed type igniter 4 which is energized or stopped by the output of the timer/flame detection circuit 3B and is connected in series with the igniter 4. The ignition flameless control circuit 16 includes a third relay switch 15a and a third relay 15 that controls a normally open third relay switch 15b connected in series with the first temperature detector 20. 16 is energized by the activation of the delay and safety circuit 13, and the heater control circuit 1
1 is started by the operation of the ignition flameless control circuit 16, so that a good fuel condition can be obtained by the heater control circuit, and reliable ignition can always be achieved by the delay and safety circuit, and the ignition flameless control circuit Of course, this has the effect of preventing unnecessary igniter operation, and in short, the start of energization of the ignition flameless control circuit that controls the igniter is performed at the same time as the combustion start operation by the delay and safety circuit. The time from when the igniter starts operating to when it stops is always constant and the igniter can always ignite reliably without stopping too early or too late, but there are problems such as the igniter stopping before it has started. Furthermore, the heater control circuit that maintains the carburetor at a constant temperature operates the igniter of the ignition and flame control circuit after the delay and safety circuit for starting combustion and the ignition flameless control circuit operate as described above. Since the operation is started by the operation of stopping the igniter, the operation is started when the ignition is not yet sufficient, and the ignition is performed more reliably without lowering the vaporizer temperature and causing an ignition error. Since the heater control circuit is simultaneously delayed by utilizing the delay effect of the ignition flameless control circuit which stops the operation of the heater control circuit, a delay circuit for the heater control circuit alone is not required, so the structure is extremely simple and inexpensive.

Furthermore, as mentioned above, the three control circuits are related and the operation of one control circuit starts the energization and operation of the sequential circuits, so the timing of each control operation amount can be maintained accurately and the automatic process from ignition to combustion can be maintained. Driving is always performed reliably,
This allows reliable control operations to be obtained at all times.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of a combustion appliance to which an embodiment of this invention is attached, and Fig. 2 is an electric circuit diagram of the main parts of the same. 1... fuel supply device, 4... igniter, 5
・・・・・・Electric heater, 11・・・Heater control circuit, 13・Song・Delay and safety circuit, 16・・・・
- Ignition and flame control circuit, 20...first temperature detector, 30...second temperature detector, 38...
Timer and flame detection circuit.

Claims (1)

[Scope of utility model registration request] It is equipped with a first temperature detector 20 that detects the temperature of a vaporizer that vaporizes fuel using the electric heater 5 as a heat source, and is connected in series with the electric heater 5 and is energized or de-energized depending on the temperature detected by the first temperature detector 20. A heater control circuit 11 includes a first relay 10 that controls an open first relay switch 10a, and a second temperature detector 30 that detects a vaporizer temperature higher than the first temperature detector 20. 2. A normally open type second relay switch 12a that is energized or deenergized depending on the temperature detected by the temperature detector 30 and connected in series with the fuel supply device 1, igniter 4, etc. and a normally closed type that is connected in series with the second temperature detector 30. The delay and safety circuit 13 includes a second relay 12 that controls the second relay switch 12 of the second relay 12, and the normally open second relay switch 12d of the second relay 12 is energized and output after a certain period of time from the energization. A normally closed third relay switch 15a is equipped with a timer/flame detection circuit 38 and is energized or deenergized by the output of the timer/flame detection circuit 38 and connected in series with the igniter 4, and is connected in series with the first temperature detector 20. The third relay 1 controls the normally open third relay switch 15b.
The ignition/flame control circuit 16 starts energizing by the activation of the delay/safety circuit 13, and the heater control circuit 11 is activated by the activation of the ignition/flame control circuit 16. An automatic control device for petroleum fuel appliances characterized by being started.