JPS58108329A - Controller for burner - Google Patents

Abstract

PURPOSE:To make the activity of a fueling element reliable, by a method wherein fuelling is carried out after existence of burning air is sensed reliably, unusual burning is prevented and a condenser is connected in parallel with a relay. CONSTITUTION:In case a burner motor 7 is suspended under a condition that light of a light source 13a is received through a notched part 12' of a shading plate 12 by a light detecting element 13b, a condenser 21b of a disorder detecting circuit 21 is started to charge by an output of a rotary detector 13 and a transistor 21c is turned on. Then, a switching element 20 is not turned on, a relay 15 is not actuated also and a device is not fueled as a gate signal to be applied to the switching element 20 from an actuation circuit 19 is bypassed by a transistor 21c. When the burner motor 7 is started to rotate, a normal operation can be started as the condenser 21b of the disorder detecting circuit 21 is disc harged. With this, unusual burning can be prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustor using oil or gas fuel.
- Regarding the control device, the fuel supply elements such as the fuel supply pump and solenoid valve should not be opened unless the burner motor is rotating normally and supplying combustion air to the burner to prevent abnormal combustion. It is an object.

Conventionally, the means for detecting the rotation of a burner motor was to mechanically close a switch and operate a fuel supply element using wind pressure from an intake fan. Mechanical means of refusing were unreliable.

The present invention employs a magnetic control system in which the rotation of the motor is detected using an optical rotation detector such as a photocoupler, which enables more accurate detection than conventional systems. A rotating mechanism consisting of a fuel supply element such as a pump or electric M1 sho that supplies fuel, a light shielding plate rotated by the rotation of a burner motor, and a light source and a light detection element arranged between the two plates. The patent and T patent disclose that the device is composed of a switching element connected to the switching element in series F and a relay that turns a switch connected in series to the -1st fuel supply element from 0% to 0ff, and a capacitor connected in the relay ≦ 2 series. This is a burner control device. Therefore, even if the output from the rotation detector is applied intermittently to the C switching element 62, the relay will continue to operate without being subjected to an i1r test due to the plowing of the capacitor.The fuel supply element will continue to operate to ensure a stable fuel supply. It is worth doing.

An embodiment will be described below with reference to the drawings.

Figure v11 is a schematic diagram of the pot-type combustor, @2 figure (b) shows a perspective view and side view of the rotation detection part, (1) is the pot burner installed in the main body (21), and (3) is its The combustion chamber formed above, (4) is the combustion air passage provided on the outer periphery of the bot burner (1), and (5) is the air passage from the intake port (61).
4) is a fan that takes in outside air, and (7) is the fan +51
(8) is the ignition heater, (19)
is a liquid fuel tank (a pump that serves as a fuel supply element that sends fuel from lO to a pot burner +11), a burner thermometer attached to an 0 Ima Bot burner (main body +2 corresponding to 1 and 2),
■ is a light shielding plate with a partial cutout where the rotating shaft 52 of the motor (7) is attached.

The mouth is a rotation detector such as a photocoupler consisting of a light source (13α) and a photodetector element (13b) arranged with the light shielding plate υ in between.

Figure 83 is a schematic electrical circuit diagram of the burner motor (7).

The pump (9) and the ignition heater aυ are connected in parallel, and the pump (9) is connected in series with the switch a4, and the ignition heater α and the burner thermometer 011 are connected in series.

4. Rotation detector α3. A control circuit αG is provided to control the opening/closing switch (141-r relay ■).This control circuit Q is connected to a step-down transformer αη as detailed in Figure @4.
, rectifier circuit @ 1 revolution Before the output from the detector port is input manually, the operating circuit (19) consisting of rear-stage transistors (19a) (19b), is 0--O by the output from the operating circuit 09.
ff, the switching element ω such as the relay QS & SCR connected in series, charges the output from the rotation detector port 3 of the capacitor connected in parallel to the relay, and turns on when there is an output that continues for a certain period of time, 1 operating circuit α9 It consists of an abnormality detection circuit (2) that bypasses the output from the switching element and blocks the input to the switching element.
2) is composed of a resistor (21a), a capacitor (21A), and a bypass transistor (21C).

Next, the operation will be explained. First, when the electric pump switch is turned on, a DC voltage is supplied through the transformer aη and the rectifier circuit. When the burner motor +7) is not rotating, the light from the light # (13a) of the rotation detector a3 is blocked by the light shielding plate opening, and the photodetecting element (11) does not operate. Therefore, the output from the rotation detector (to) is 0, so the front stage transistor (19a) of the operating circuit (2) is turned off, and the rear stage transistor (19h) is ORed, so the output from the operating circuit a9 is 0. It's off.

When the burner motor (7) starts rotating, the light shielding plate 0 also rotates and the light is exposed from the notch ■, so the light detection element (154)
is "WL," and the output 1 from the detector port activates the operating circuit α.
- The front stage transistor (19a) is turned on and the rear stage transistor (197) is turned off. Therefore, a gate signal is inputted to the gate cd of the switching element member and is turned on. Then, the relay a9 is energized and its switch a4 is closed, and the pump (91) is operated to supply fuel to the bot burner.Meanwhile, the ignition heater 181 is energized via the Harnachymo apv, so it receives fuel and is ignited. Combustion begins and the burner thermometer α°C is released due to the heat, which stops the energization to the ignition heater (8).

However, since the exposure from the cutout part of the light-shielding plate υ is intermittent, the output from the detector a3 becomes an intermittent pulse as shown in Fig. 5 (a), and the switching element activated by this becomes an intermittent pulse as shown in Fig. 5 &ffl. Although the relay is activated intermittently (
Since a capacitor (support) is connected in parallel to (to), it is charged when switching element - is in OrL, and this charge is transferred to darkness 1 when switching element - is off.
It discharges as shown by the arrow in Figure 84, and this discharge current causes relay a.
9, as shown in FIG. 5(c), t2 energization is continued to ensure fuel supply.

On the other hand, the burner motor (7
) stops.

In this case, since the output from the rotation detector 0 continues, this output is used as the capacitor (21) of the abnormality detection circuit LD.
A) stops charging and its transistor (2IC) is on.
do. Then, this transistor (2I C) bypasses the gate signal applied to the switching element - from the operating circuit 09, so the switching element j is not affected, and therefore the relay (to) is not activated, so fuel is supplied. There isn't.

When the burner motor (7) rotates, the capacitor (214) of the abnormality detection circuit is discharged, so that normal operation can be resumed.

The great invention is as described above, and since the fuel is supplied after sensing the presence of combustion air, abnormal combustion can be prevented.Furthermore, by connecting a capacitor in parallel to the relay, the fuel supply element of the pump etc. operation can be maintained reliably.

[Brief explanation of the drawing]

All figures are of the present invention, and Figure 1 is a schematic diagram. ＠Figure 2 shows the light detection part, ＠ is a perspective view, - is a side view, ＠
3 is a schematic diagram of the electric circuit, FIG. 4 is a detailed diagram of the control circuit of FIG. 3, and FIG. 185 is a waveform diagram. (9)... Fuel supply element, Q3-... Rotation detector, α
... Operating circuit, (a) ... Switching element, a
B... Relay, bad... Capacitor. + O-0-() ♀ , Dan Go

Claims (1)

[Claims] (1) A fuel supply element such as a pump or solenoid valve that supplies fuel to the burner, a light shielding plate rotated by the rotation of the burner motor, a rotation detector consisting of a light source and a light detection element arranged with the light shielding plate in between, tf An operating circuit that is activated by the output signal from the rotation detector, and the output from the operating circuit is -0f.
-f switching element, a switch connected in parallel to the switching element and connected in series to the fuel supply element to turn off the relay, and a capacitor connected in parallel to the relay.