JPS62162819A - Controller for space heater - Google Patents

Abstract

PURPOSE:To shorten the ignition time and carry out the optimum burning by switching the rotating speed of a burner motor and the frequency of a pump individually and also setting the different frequency of the pump at the ignition time in comparison with that at the normal burning time. CONSTITUTION:A microcomputer 11 has a setting part 11a for an air fuel ratio at the ignition time and a setting part 11b for the air fuel ratio at the normal burning time. At the ignition time, a burning control part 11c controls a burner motor 3 and a pump 4 at the air fuel ratio set by the part 11a and after an ignition detecting circuit 22 finds out ignition, a signal to the part 11c is supplied from the part 11b and the part 11c controls the burner motor 3 and the pump 4 at the air fuel ratio set by the part 11b. Thus, the ignition operation is carried out at the most suitable air fuel ratio for ignition until the ignition is detected and after the ignition, the operation is switched to that having the air fuel ratio with satisfactory burning characteristic and therefore, ignitability is improved and the generation of unburnt gas causing foul odor can be minimized.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is applicable to hot air heaters such as oil fan heaters. The present invention relates to a control device, and particularly relates to fuel control before and after ignition.

Conventional Technology In conventional heaters, in order to set the optimum combustion air-fuel ratio, the frequency of the pulse pump (hereinafter referred to as pump) used as the fuel supply device is adjusted to the rotation speed of the burner motor used as the combustion air supply device. I had decided on a certain value. Fig. 4 shows an example of the circuit.
102 is an operation switch, 103 is a combustion control unit, 104 is a burner motor, 105 is an igniter, 106 is a pump, 10
7 is a relay contact for driving the burnamorph 104, 108 is a relay contact for driving the igniter 105, 109 is a relay contact for driving the pump 106, and relay contacts 107.108.109
is configured to be switched by the combustion control section 103.

Problems to be Solved by the Invention However, with the conventional configuration described above, it is difficult to optimize ignition performance because the air-fuel ratio (2) is focused during normal combustion, resulting in a delay in ignition time. There was a problem in that unburned gas was generated and a bad odor was felt. In other words, during normal combustion, the air-fuel ratio is set to a chain acid that produces the least harmful gases such as carbon monoxide, but at this air-fuel ratio, the fuel concentration is too low and ignition takes time, during which time unburned gas is released. It smelled bad. Furthermore, if the air-fuel ratio is changed and set to improve ignition performance, the problem arises that the air-fuel ratio deviates from the optimum air-fuel ratio during normal combustion, resulting in less margin for the generation of harmful gases such as carbon monoxide.

Kibatsu'3rl is a product that solves these problems and aims to shorten the ignition time and achieve the best possible combustion.

Means for Solving the Problems In order to solve the above problems, the present invention has a configuration in which the rotational speed of the burner motor and the frequency of the pump are individually changed by 11J, so that the frequency of the pump during ignition operation is set to be different from that during normal combustion. 3. The operation of the water valve 1 is such that the frequency setting of the pump is switched to the air-fuel ratio that optimizes the ignition time for the VC during ignition, and the frequency setting of the pulse pump is switched to the air-fuel ratio that optimizes the combustion characteristics at the time of ignition. can be switched to Therefore, when igniting, the ignition time is shortened and less unburned gas is generated, and optimal combustion is achieved in which no harmful gas is generated during normal combustion.

EXAMPLE Hereinafter, an example of a water valve [Jl will be described with reference to the accompanying drawings.

Fig. 3 is a diagram showing a schematic configuration of 7 unheaters, where 1 is an outer shell, 2 is a vaporization type combustor provided inside the outer shell, 3 is a burner motor that supplies combustion air to the combustor, and 4 is a specific When the pulse signal Jij- is input, an amount of liquid fuel corresponding to the frequency of the pulse signal is supplied to the combustor! A pump with a built-in JA dynamic circuit 4', 5 a fuel tank that supplies fuel to the pump 4, 6 a combustion cylinder connected to the combustor,
Reference numeral 7 designates a convection blower provided to send heat from the combustion tube into the room, and reference numeral 8 designates an igniter that performs ignition operation when starting combustion. An operating switch 9 for operating combustion 0N10FF is provided in an operating section (not shown) K.

FIG. 2 shows a circuit for controlling this fan heater, and numeral 11 is a microcomputer, which controls the output according to each input signal and performs combustion control. 12 is a commercial power source; 131″! is a heater embedded in the combustor 2 to vaporize the fuel supplied by the pump 4; 14 is a temperature sensor that detects the temperature of the combustor 2 heated by the heater 13; The element 15& is a contact point of a relay 15 that turns the heater 13 on and off by the signal from the temperature detection element 14.
16a is a contact point of the relay 16 that turns the burner motor 3 on 0N10FF, and 17a turns the convection blower 7 on 0N10F.
Contact point 18a (d) of relay 17 that turns on igniter 8
Relays 15, 16, 17, and 18 with these relay contacts are output terminals 01 and o2.03.0 of the microcomputer 11, which are N10FF contacts.
417il: are connected to each other, and when the output of the microcomputer 711 is "XL", the coil of each relay is excited.

19 goes to pump 4! It is a photocoupler that transmits the pulse signal for the UJ drive, and is connected to the output terminal 05 of the two-legged microcomputer 11.

It contains the input terminals of the above-mentioned microcombuque 11il"t, 11, 2, r3, and the input terminal 11 is connected to the operation switch 9 which is pulled down with a resistor 20. Also, the input terminal 13Vi ignition detection It is connected to the circuit 22. Finally, the input terminal 12 is connected to the temperature detection circuit 21VC of the combustor 2.

In the above configuration, when the microcomputer 11 detects through the input terminal 11 that the operation switch 9 is turned on, the relay 15 is turned on as the output terminal 01→ゝゝLH.
Then, the heater 13 is energized. When the temperature of the combustor 2 reaches a predetermined temperature, the output from the temperature detection circuit 21 is inverted due to (; δ1→ゝ゛H'(02,03→ゝゝL II), and relay 15 is turned off.

QN relays 16 and 17 and turn off heater 13.

The burner motor 3 and convection blower 7 are operated.

After a while, a pulse signal is output from the output terminal o5 to turn the pulse pump 4 to "Jb (th), and at the same time, the output terminal 04 is changed to "L +7", the relay 18 is turned on, the igniter 8 is driven, and the ignition mh operation is performed. .

At this time, the oscillation frequency of the pulse pump 4 is set to, for example, 17.6 Hz, so that the optimum air-fuel ratio is obtained.

Here, the output from output terminal 05 is ゝゝL rL times signal 1
The IIEIJ operation of outputting the signal for m5 and then outputting the "H" signal for 55.8ms is repeated.

Next, when ignition occurs, the output of the ignition detection circuit 22 is inverted, and a signal is input from the input terminal check 3 to the microcomputer 11.
At this time, the oscillation frequency of the pump 4 is switched to, for example, 16 Hz to achieve the optimum combustion air-fuel ratio.

As shown in FIG. 1, the microcomputer 11 has an ignition air-fuel ratio setting section 11a and a normal combustion air-fuel ratio setting section 11.
During ignition, the combustion control section 11c controls the burner motor 3 and the pump 4 at the air-fuel ratio set by the ignition air-fuel ratio setting section 11a, and when the ignition detection circuit 22 detects ignition, the combustion control section lie The signal to the normal combustion air-fuel ratio setting section 11b
As described above, the control device of the present invention performs the ignition operation at the optimum air-fuel ratio for I5 in the trench detected by a good person, and after ignition, switches to the air-fuel ratio with good combustion characteristics. It gets better and ignition is completed in a short time.

In other words, it is possible to reduce the need for generating unburned gas that causes bad odors. In addition, after ignition, the combustion is stable and there is a large margin against the generation of harmful gases such as carbon monoxide.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one power part of a control device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the same, FIG. 3 is a sectional view of a heating machine using a water valve 131+ control device, and FIG. The figure is a circuit diagram showing a conventional control device. 2... Combustor, 3... Combustion air supply device (burner motor), 4... Fuel supply device (pump), 11... Microcomputer, 22
...Ignition detection circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 83 Figure 2-゛-Burner No. 4
Figure 1θ71αZani2

Claims (1)

[Claims] A microcomputer that individually controls a combustor, a combustion air supply device that supplies combustion air to the combustor, a fuel supply device that supplies fuel to the combustor, and the combustion air supply device and fuel supply device. and an ignition detection circuit that detects ignition of the combustor and changes an air-fuel ratio of fuel gas to the combustor.