JPS61186718A - Combustion control equipment - Google Patents

Abstract

PURPOSE:To perform easily for inspection and maintenance work of a burning equipment as well as an investigation work on the cause of the failure by a method wherein alarm lamps are installed separately for failure of ignition, flame out during burning operation and an abnormal increase in temperature above the given value in a combustion cylinder. CONSTITUTION:In case of an ignition failure at the starting operation, a switching element 37 is opened for a given time and upon reaching a charging voltage of the first condenser 16 to the predetermined value, an output of the fourth comparison circuit 30 becomes H level, the first switching element 26 is closed its circuit to energize the first alarm lamp 21. While, in case of the flame out during a burning operation, an output of a flame detecting circuit 33 becomes L level, an output of the second comparison circuit 32 generates an output signal of H level, simultaneously, a contact 37 is closed through a switching circuit 36. At this time, through a diode 18, a charge of the second condenser 15 is discharged through a resistance 8 to energize the second alarm lamp 22. Also in case a temperature in a combustion cylinder exceeds the predetermined value, a temperature detector 27 detects it and the third alarm lamp 23 is energized through the both third comparison circuit 28 and third switching element 24.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a combustion control device for a combustion machine, and particularly to an abnormality detection circuit thereof.

[Prior art]

FIG. 2 shows an abnormality detection circuit of a conventional combustion control device.

In the figure, (1) is a DC power supply, (sub)) is an abnormality detection circuit that detects non-ignition and extinguishing during combustion and generates an output signal, ■ is a switching circuit, - is a resistance, ! 4i1 is a warning lamp composed of a light emitting diode.

[Problem to be Solved by the Invention 3] In the conventional combustion control device configured as described above, the temperature of the third alarm lamp that lights the alarm lamp 1411 in the event of non-ignition or extinguishing of flame during combustion and the temperature of the combustion tube are set at a predetermined level. A third alarm lamp that lights up when the temperature exceeds Iζ is designed to facilitate and speed up inspection and repair work.

[Means for solving problems]

The combustion control device according to the present invention includes a flame detection circuit that generates output signals H and L depending on the presence or absence of flame detection; A switching circuit has a switching element that closes when the output signal M1 is supplied, and the output side is grounded via the switching element, and when the output signal M1 is supplied when there is no ignition, the output signal M1 is
a first comparator circuit that generates a voltage and charges a first capacitor connected to its output side to a predetermined voltage or higher, thereby closing a first switching element and energizing a first alarm lamp; The second connected to its output side during combustion
When the flame is extinguished, the electric charge stored in the capacitor is discharged through the resistor, and the above output signal is supplied to generate the output signal H2, thereby closing the second switching element and turning off the second alarm lamp. the second to energize
When the temperature of the combustion cylinder rises above a predetermined temperature, the temperature detector detects the temperature and generates an output signal corresponding to the temperature, thereby closing the third switching element. By providing a third comparison circuit that energizes the warning lamp, the combustion control device can be adjusted to α1 to achieve the above object.

[Effect]

In this invention lζ, at the time of misfire fζ, the output signal H1 is generated from the first comparator circuit, and the first capacitor charges the output side to a predetermined voltage or higher, thereby closing the first switching element. Energize the first alarm lamp.

During combustion, the first charge charged to the output side of the second comparison circuit by the second capacitor is discharged via the resistor and the switching element, and an output signal (i2) is generated on the output side, thereby causing the second switching. A second alarm lamp is energized via the element. Furthermore, when the temperature of the combustion tube rises to a predetermined temperature or higher, an output signal generated from the temperature detector closes the third switching element and energizes the third alarm lamp.

By energizing the first to third alarm lamps, the cause of failure can be easily investigated during inspection and repair.

[Embodiment j FIG. 1 is an electrical circuit diagram of a combustion control device showing an embodiment of the present invention. In the figure +21131 +4+city51
161 +71181 +91 Gol till 1
121431 +141! ! Low resistance (151161 is a capacitor, UηUSuJJ is a diode, -0 is the first
The alarm lamp is the alarm lamp, @ is the second alarm lamp, is the third alarm lamp, and I:A4 (to) is the first alarm lamp. Second. The third switching element is a temperature detector that detects the temperature of the cylinder, c1111321 (2) 1. lO1@ is the first . 2nd, ia, 4th.
The fifth comparison circuit (to) is a flame detection circuit that contains flame 1, picture (2), and cylindrical earth (2) of the combustion machine body. When the flame detection circuit CO1 detects a flame, it generates a flame detection signal 'r'i level on its output side. ■ is a switching circuit, and when the flame is extinguished in the middle of normal combustion during pre-purge, the contact surface is closed by the output signal of the flame detection circuit [Yes], and after the completion of pre-purge, if there is no ignition, the contact surface is opened for a certain period of time and then closed again. . However, if it ignites normally, there will be a contact point during combustion.
is configured so that it remains open.

Next, this invention will be explained in detail. In normal operation, when the combustion control device is started, the contact surface is closed during pre-purge due to the function of the switching circuit (to). Therefore, the first and second capacitors (ltilα9) are not charged through the diode (l[il u!J).

Therefore, the fourth. The output of the fifth comparator circuit is not at the 1L'' level.The first alarm lamp (2) and the second alarm lamp are not energized.After the pre-purge is completed, the contact (() is opened for a predetermined period of time) As a result, charging starts at the first and second capacitors Q61 (151).At this time, the second
The time constant for charging the capacitor +151 is longer than the predetermined time when the contact surface is open, and the time constant for charging the first capacitor ue is set so that it is shorter than the predetermined time described above. . Here, an ignition operation is performed by a separate ignition device (not shown). If fζ is ignited normally, the output of the flame detection circuit will be at the ゝh'' level and the contact will remain open. However, the output of the first and second comparison circuits (31) and (2) will be at the 1tL77 level. Therefore, - 10,000 diodes ■
In order to discharge the charge of the first capacitor ue through the UE and on the other hand keep the gate of the second switching element at 1L level, the first alarm lamp ULL and the second alarm lamp are not energized; Normal combustion will continue.

Next, the operation at the time of misfire will be explained. If there is no ignition during the above-mentioned normal ignition operation, the switching element (2) closes for a predetermined period of time, and when the completed voltage of the first capacitor port 6) reaches the predetermined voltage fζ, the fourth comparison circuit The output of the field goes to 'h' level, the first switching element closes and the first alarm lamp is energized.After that,
The switching element (2) closes again and repeats the ignition operation from the re-double purge. At this time, the charge in the second capacitor 1151 is discharged through the diode mark, so the second alarm lamp @ is not activated. That is, in the case of a misfire, the ignition operation is performed twice, and if the second ignition also fails, a separate safety circuit (not shown) is activated to stop the combustion control device. By setting the reference voltage of the first comparator circuit c(1), if a ignition occurs with the flame current below a predetermined value, the first alarm lamp (2) will be activated.
) is energized, and if the flame current rises until the opening/closing element closes, the electric charge of the first capacitor U61 is discharged through the diode I, and the switching circuit ■
The switching element (2) remains open via the , and normal combustion continues.

Next, the operation during flame extinguishing during combustion will be explained.

If the flame is extinguished during combustion during normal operation as described above, the output of the flame detection circuit ■ will be at the "L" level, so the outputs of the first comparison circuit 6υ and the second comparison circuit ■ will each be at the 1h# level. While generating the signals M1 and H2, the contact (2) is closed via the switching circuit (to). At this time, at -19, the first alarm lamp (
2) is not energized. On the other hand, by starting to discharge the charge of the second capacitor (Is through the resistor (8) through the diode 0 seconds and at the same time setting the reference voltage of the second comparator circuit (2), a predetermined flame current can be maintained during combustion. If the combustion occurs under 1L, the second alarm lamp is activated immediately.In addition, when the second alarm lamp is activated, the gate of the first switching element track is connected to 1L" via the diode Uη. Therefore, the alarm rambler υ of the cylinder 1 is not activated after that. Next, we will explain the case where the temperature of the combustion cylinder ζ rises above a predetermined temperature. In this case, the temperature detector n detects that the temperature has risen above a predetermined temperature, and the third comparison circuit mark and the third switching element t24
1, the third alarm lamp is energized. This third
The alarm lamp (c) will be activated if the temperature rises above the specified temperature at any time during pre-purge or combustion, as long as the combustion control device is energized, that is, as long as the power supply voltage is being supplied. Forced. In addition, 1st. Second. Once the third alarm lamp-11@(2) is energized, the first one. 2nd ° 3rd switching element (to) (2) (to)
Due to its memory function, it remains energized as long as the electric voltage is supplied.

〔Effect of the invention〕

As explained above, the present invention includes a flame detection circuit that generates output signals H and L depending on the presence or absence of flame detection; A switching circuit has a switching element that closes when a signal is supplied, and the output side is grounded via the switching element, and when the output signal H1 is supplied in the event of a misfire, an output signal H1 is generated.
a first comparator circuit that generates a voltage and charges a first capacitor connected to its output side to a predetermined voltage or higher, thereby closing a first switching element and energizing a first alarm lamp; During combustion, the electric charge charged in the second capacitor connected to the output side is discharged through the resistance during flame-extinguishing, and the above output signal is supplied, thereby generating the output signal H2. a second comparison circuit that closes a second switching element and energizes a second alarm lamp; and a temperature detector that detects the temperature when the combustion cylinder rises above a predetermined temperature; The combustion control device is configured by providing a third comparison circuit which closes the third switching element and energizes the third alarm lamp by generating a corresponding output signal. When the first alarm lamp is energized and the flame goes out during combustion, the second alarm lamp is energized, and when the temperature of the combustion tube rises above a predetermined temperature, the third alarm lamp is energized. This has the effect of making work easier when inspecting, repairing, and investigating the cause of failure.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of a combustion control device showing an embodiment of the present invention, and FIG. 2 is an electric circuit diagram of a conventional combustion control device. In the figure, (to) is the flame detection circuit, the surface is the switching element, ■ is the switching circuit, u[il is the first capacitor, (2)
is the first switching element, (2) is the first alarm lamp, c31) is the first comparison circuit, 1151 is the second capacitor, (8) is the resistor, ■ is the second switching element, ■
is the second alarm lamp, ■ is the second comparison circuit, slope is the temperature detector, (to) is the third switching element, is the third alarm lamp, (to) is the third comparison circuit . Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 2

Claims (1)

[Claims] A flame detection circuit that generates output signals H and L depending on the presence or absence of flame detection, opens for a predetermined period of time when there is no ignition, opens when the output signal H is supplied, and closes when the output signal L is supplied. a switching circuit having a switching element whose output side is grounded via the switching element, which generates an output signal H_1 by being supplied with the output signal L when there is no ignition, and a first capacitor connected to the output side of the switching circuit; The first comparison circuit closes the first switching element and energizes the first alarm lamp when the voltage is charged to a predetermined voltage or above, and the second capacitor connected to the output side of the first comparison circuit is charged during combustion. When the flame is extinguished, the electric charge is discharged through the resistor, and the output signal L is supplied to generate the output signal H_2, close the second switching element, and energize the second alarm lamp. When the temperature of the comparator circuit and the combustion cylinder rises above a predetermined temperature, the temperature detector detects the temperature and generates an output signal according to the temperature, thereby closing the third switching element and issuing a third alarm. A combustion control device with a third comparison circuit for energizing the lamp.