JPH06313544A - Method of controlling blower of hot air heater - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the ignitability of the hot air heater when it is ignited, and to control the blower of the hot air heater so that cold air is not blown out. According to a first aspect of the present invention, a drive current is supplied to a drive motor of the blower at substantially the same time as ignition is started, and at least a first predetermined time after which the drive motor of the blower has a predetermined rotation speed from the start of ignition After the elapse of time, the supply of the drive current to the drive motor is stopped, and after the supply of the drive current is stopped, the supply of the drive current to the drive motor is started at least after the elapse of a second predetermined time necessary for ignition. Is configured as
The second aspect of the invention is configured to drive the blower by applying a drive voltage lower than the drive voltage applied during the normal operation until the predetermined time elapses from the ignition start timing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an oil fan heater, a gas fan heater or the like at the time of ignition, and more particularly to a drive control method at the time of ignition of a blower for circulating warm air.

[0002]

2. Description of the Related Art For example, in a hot air heater such as an oil fan heater, as disclosed in JP-A-3-20518, a combustion section for burning fuel, and combustion gas is supplied from the combustion section to exchange heat. It has a heat exchange section for performing the above and a blower for transmitting heat to the room. The air is taken in by the blower and blown out through the heat exchange section to heat the room.

The above-mentioned warm air heater has a control device for changing the combustion amount in the combustion section and the air flow amount of the blower according to the temperature difference between the room temperature and the set temperature, and always keeps the room temperature at the set temperature. It was supposed to be maintained.

In the warm air heater, when ignition is performed, the fan motor of the blower for forcibly circulating the hot air is started at the same time as the ignition at time t21.

[0005]

In controlling the conventional hot air heater, as shown in FIG. 10, the maximum voltage Vmax is applied to the fan motor of the blower, and the ignition is started (= time t21). Even when the ignition was completed (= time t22), the vehicle was still driven.

Therefore, when igniting, excessive air is supplied into the burner to deteriorate the ignitability, resulting in an incomplete combustion state, which easily causes white smoke.

Further, since the maximum voltage is applied for driving during ignition, there is a problem that the circulating air volume becomes the maximum air volume, the ignitability deteriorates, and the cold air comes out from the hot air outlet.

Therefore, an object of the present invention is to improve the ignitability of the warm air heater at the time of ignition and to control the blower of the warm air heater so that the cold air is not blown out.

[0009]

In order to solve the above-mentioned problems, the first invention is to supply a drive current to a drive motor of the blower at substantially the same time as the start of ignition, and to drive at least the blower from the start of the ignition. After a lapse of a first predetermined time in which the rotation speed of the motor reaches a predetermined rotation speed, the supply of the drive current to the drive motor is stopped, and after the supply of the drive current is stopped, at least a first time required for ignition is reached. 2 is configured to start supplying the drive current to the drive motor after a predetermined time.

A second aspect of the present invention is a method of controlling a blower of a warm air heater for forcibly circulating hot air, wherein a predetermined time elapses from a timing at which ignition is started.
The blower is configured to be driven by applying a drive voltage lower than the drive voltage applied during normal operation.

[0011]

According to the first aspect of the invention, substantially at the same time as the start of ignition,
A drive current is supplied to the drive motor of the blower, which causes the drive motor to start rotating.

Next, the supply of the drive current to the drive motor is stopped after a lapse of at least a first predetermined time in which the rotation speed of the drive motor of the blower reaches the predetermined rotation speed from the start of ignition. After that, the drive motor continues to rotate due to inertia.

Then, after the supply of the drive current is stopped, the supply of the drive current to the drive motor is started at least after the elapse of the second predetermined time required for ignition.

Therefore, the drive motor rotates at a speed equal to or lower than the predetermined number of revolutions before ignition, so that air is not excessively supplied, ignition is facilitated, and white smoke is not emitted. Further, since the drive motor continues to rotate due to inertia, it is easy to shift to the normal drive state after ignition.

According to the second aspect of the invention, the blower is driven by applying a drive voltage lower than the drive voltage applied during the normal operation until the predetermined time elapses from the ignition start timing.

Therefore, the air is not excessively supplied, ignition is facilitated, and white smoke is not emitted.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described with reference to the drawings. First Embodiment First, a first embodiment will be described with reference to FIGS. 1 to 5.

FIG. 1 shows an external perspective view of the oil fan heater, and FIG. 2 shows a rear view of the oil fan heater.

The petroleum fan heater has an outer case 1, and an air suction port 3 having an air filter is provided on the back side of the outer case 1. Also, the outer case 1
A warm air outlet 4 communicating with the air inlet 3 is provided on the front side of the.

Inside the outer case 1, there is provided a warm air blower 5 for taking in indoor air through the air suction port 3 and blowing out warm air from the warm air outlet 4.

Further, in the outer case 1, a cartridge tank 6 for storing kerosene as a fuel, and an oil receiving tank 7 functioning as a buffer for stably supplying kerosene supplied from the cartridge tank to a combustion system described later. , A fuel pump 8 for supplying kerosene in the oil receiving tank 7 to a burner described later, a combustion blower 9 for supplying fresh combustion air to the burner described later, and a burner 10 for burning kerosene.
A combustion cylinder 11 functioning as a heat exchanger for efficiently extracting heat from the combustion of kerosene in the burner 10, a blower guide case 12 for guiding the air from the warm air blower 5 to the vicinity of the combustion cylinder, and an oil A control device 13 that controls the entire fan heater is provided.

An operation panel 14 is provided on the upper surface of the outer case 1, and a room temperature sensor 15 for measuring the room temperature is provided on the lower rear surface.

FIG. 3 is a block diagram showing the basic configuration of the control device 13.

The control device 13 has a ROM (not shown) storing a control program, a RAM (not shown) for storing various data, an A / D converter for analog / digital conversion, etc. built therein, and a micro controller for controlling the entire device. It has a computer (hereinafter referred to as a microcomputer) 17.

On the input side of the microcomputer 17, an operation switch 18 for operating / stopping the warm air heater, a temperature setter 19 for the user to set a desired room temperature,
A room temperature sensor 15, a burner temperature sensor 20 that detects the temperature of the fuel vaporization section of the burner 10, and a flame detector FL that detects the presence or absence of a flame in the burner are connected.

On the other hand, on the output side of the microcomputer 17, an electric heater 21 for heating the fuel vaporization portion of the burner 10, an igniter 22 for igniting the vaporized fuel, a burner motor 9M for driving the combustion blower 9, and a fuel pump. 8. Digital display 23 and fan motor 5 for displaying room temperature and set temperature
A drive control circuit 24 for controlling the supply / non-supply of the drive current to M is connected.

As the burner motor 9M and the fan motor 5M, AC motors such as a shaving motor are used.

The operation switch 18, the temperature setting device 19 and the digital display 23 are provided on the operation panel 14.

FIG. 4 shows a flow chart of the initial operation of the warm air heater, and FIG. 5 shows its timing chart.

When the microcomputer 17 detects that the operation switch 18 has been turned on, the electric heater 21 is energized to heat the fuel vaporization section of the burner 10. When the burner temperature sensor 20 detects that the temperature of the burner vaporization section has reached a temperature suitable for vaporizing kerosene as fuel and preheating is completed, the microcomputer 17 operates the burner motor 9M to pre-purge the burner 10 ( Step S1).

When the prepurge is completed, the microcomputer 17 activates the igniter 22. In parallel with this, the microcomputer 1
At time t1, 7 supplies the drive current to the fan motor 5M through the drive control circuit 24 to operate the blower for warm air, further starts the fuel pump, and starts the supply of fuel (step S2).

Next, the microcomputer 17 causes the fan motor 5M to be supplied with the drive current, and then the predetermined time T (=
It is determined whether or not t2-t1 has elapsed (step S
3) At the time when a predetermined time has elapsed (= time t2), that is, when the time at which the rotation speed of the fan motor 5M should reach a predetermined rotation speed R lower than the maximum rotation speed Rmax has elapsed, the drive control circuit 24 The supply of the drive current to the fan motor 5M is stopped via (step S4).

As a result, the fan motor 5M is rotated by inertia, and the rotational speed thereof is gradually reduced.

On the other hand, when the combustion air is supplied to the burner 10 and the fuel is supplied to the vaporizing portion of the burner 10, the fuel is vaporized, mixed with the combustion air, and then ignited by the igniter 22.

Thereafter, when the microcomputer 17 detects ignition at the output signal of the flame detector FL at time t3 (step S5), it again supplies the drive current to the fan motor 5M via the drive control circuit 24. The hot-air blower is operated by (step S5).

As a result, the rotation speed of the fan motor 5M increases again, and increases to a predetermined rotation speed, for example, the maximum rotation speed, and reaches a constant rotation speed at time t4.

Thereafter, the microcomputer 17 enters a normal heating operation for performing combustion control, hot air flow rate control, etc. (step S
6).

As described above, according to the first embodiment, the fan motor 5M rotates at a speed equal to or lower than the predetermined rotation speed R before ignition, so that the air is not excessively supplied and the ignition is easy. And no more white smoke. Also,
Since the fan motor 5M continues to rotate due to inertia even after the supply of the drive current is stopped, it is possible to easily shift to the normal drive state after ignition. Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. 6 to 9.

FIG. 6 shows a schematic block diagram of the control device of the second embodiment.

In the first embodiment described above, the rotation speed of the fan motor at the time of ignition is controlled by supplying / non-supplying the driving current. In the second embodiment, however, the fan motor is supplied. In this embodiment, the rotation speed of the fan motor during ignition is controlled by controlling the driving voltage to 6, the same parts as those in the first embodiment of FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

6 is different from FIG. 3 in that a drive voltage control circuit 25 for controlling the drive voltage supplied to the fan motor 5M is provided in place of the drive control circuit 24.

FIG. 7 shows an operation flowchart of the second embodiment, and FIG. 8 shows a timing chart thereof.

When detecting that the operation switch 18 has been turned on, the microcomputer 17 energizes the electric heater 21 to heat the fuel vaporization section of the burner 10. When the burner temperature sensor 20 detects that the temperature of the burner vaporization section has reached a temperature suitable for vaporizing kerosene as fuel and preheating is completed, the microcomputer 17 operates the burner motor 9M to pre-purge the burner 10 ( Step S11).

When the prepurge is completed, the microcomputer 17 operates the igniter 22 for a predetermined time. In parallel with this, the microcomputer 17 supplies the initial drive voltage to the fan motor 5M via the drive voltage control circuit 25 at time t11 to operate the warm air blower, and further starts the fuel pump to supply the fuel. Is started (step S12).

As a result, the fan motor 5M gradually increases its rotational speed to reach the rotational speed RI corresponding to the initial drive voltage VINIT at time t12.

On the other hand, when the combustion air is supplied to the burner 10 and the fuel is supplied to the vaporizing portion of the burner 10, the fuel is vaporized, mixed with the combustion air, and then ignited by the igniter 22.

After that, when the microcomputer 17 detects ignition at the output signal of the flame detector FL at time t13 (step S13), the fan motor 5M is driven again in the normal operation through the drive voltage control circuit 25. A voltage is supplied (step S14).

As a result, the rotation speed of the fan motor 5M increases again, and a predetermined rotation speed, for example, the maximum rotation speed Rmax is reached.
The number of revolutions is increased until it becomes, and the number of revolutions becomes constant at time t14.

After that, the microcomputer 17 enters a normal heating operation for performing combustion control, hot air flow rate control, etc. (step S1).
5).

The operation of the drive voltage control circuit 25 will be described in more detail with reference to FIG.

Under the control of the microcomputer 17, the drive voltage control circuit 25 changes the phase angle α of the trigger pulse to reduce the AC voltage applied to the fan motor 5M at the initial drive.

More specifically, assuming that the phase angle at the normal drive voltage V is α, the phase angle αINIT at the initial drive voltage VINIT is set to αINIT> α, and the initial drive voltage VIN applied to the fan motor 5M is set.
Control IT so that VINITM <V.

As a result, the rotation speed of the fan motor 5M is lower in the initial driving state than in the normal driving, the air is not excessively supplied, the ignition is facilitated, and the white smoke is not emitted.

As described above, according to the second embodiment, during the initial operation, the fan motor 5M is driven by applying the initial drive voltage lower than the drive voltage applied during the normal operation. Is not supplied excessively, ignition is facilitated, and white smoke is not emitted.

[0055]

According to the first aspect of the present invention, a drive current is supplied to the drive motor of the blower almost at the same time as the start of ignition, whereby the drive motor starts to rotate and at least the drive motor of the blower rotates from the start of ignition. First number becomes a predetermined number
Supply of the drive current to the drive motor is stopped after a predetermined time has passed, and the supply of the drive current to the drive motor is supplied at least after the second predetermined time required for ignition has elapsed after the supply of the drive current was stopped. Therefore, the drive motor rotates at a speed equal to or lower than the predetermined number of revolutions before ignition, so that air is not excessively supplied, ignition is facilitated, and white smoke is not emitted. Further, since the drive motor continues to rotate due to inertia, it is possible to easily shift to the normal drive state after ignition.

According to the second aspect of the present invention, a drive voltage lower than the drive voltage applied during the normal operation is applied to the blower until the predetermined time elapses from the ignition start timing. Is not supplied excessively, ignition is facilitated, and white smoke is not emitted.

[Brief description of drawings]

FIG. 1 is an external perspective view of a warm air heater.

FIG. 2 is an explanatory diagram of an internal structure of a warm air heater.

FIG. 3 is a block diagram showing a schematic configuration of a control device of the first embodiment.

FIG. 4 is a flowchart of an initial operation of the warm air heater of the first embodiment.

FIG. 5 is an operation timing chart of the first embodiment.

FIG. 6 is a block diagram showing a schematic configuration of a control device of a second embodiment.

FIG. 7 is an initial operation flowchart of the warm air heater of the second embodiment.

FIG. 8 is an operation timing chart of the second embodiment.

FIG. 9 is a diagram illustrating the operation of the voltage control circuit.

FIG. 10 is an operation timing chart of the conventional warm air heater.

[Explanation of symbols]

 1 Outer Case 2 Air Filter 3 Air Suction Port 4 Hot Air Blowout 5 Hot Air Blower 5M Fan Motor 6 Cartridge Tank 7 Oil Receiving Tank 8 Fuel Pump 9 Combustion Blower 9M Burner Motor 10 Burner 11 Combustion Tube 12 Blower Guide Case 13 Control Device 14 Operation panel 15 Room temperature sensor 17 Microcomputer 18 Operation switch 19 Temperature setting device 20 Burner temperature sensor 21 Electric heater 22 Igniter 23 Digital display 24 Drive control circuit 25 Drive voltage control circuit

Claims (2)

[Claims] 1. A method for controlling a blower of a warm air heater for forced circulation of hot air, wherein a drive current is supplied to a drive motor of the blower at substantially the same time as ignition is started, and at least the drive is started from the start of ignition. The supply of the drive current to the drive motor is stopped after the lapse of a first predetermined time in which the rotation speed of the motor reaches a predetermined rotation speed, and after the supply of the drive current is stopped, it is necessary for at least ignition. A method of controlling ignition time of a blower of a warm air heater, comprising: supplying a drive current to the drive motor after a second predetermined time has elapsed. 2. A method for controlling a blower of a warm air heater for forcibly circulating hot air, comprising: a drive voltage applied to the blower during normal operation until a predetermined time elapses from the timing of ignition start. A method for controlling a blower of a warm air heater, characterized by applying a driving voltage lower than that of the above.