JP3075112B2 - Control device for combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a burning appliance such as an oil fan heater.

[0002]

2. Description of the Related Art Conventionally, this type of control apparatus for a combustion appliance requires measures to prevent the generation of unburned gas at the time of ignition and after ignition, flame stability, and smooth flame detection. Alternatively, a burner motor having a high starting torque is adopted so that the motor can be started well even at a low voltage.

[0003]

However, in the above-mentioned conventional control device, there is no other way but to secure the ignition performance by using a burner motor having a larger starting torque as the heating output becomes larger, and the size of the device body becomes larger. There was a problem that the cost had to be increased.

The present invention solves the above-mentioned problems, and standardizes the burner motor specifications even in a combustion device having a large heating output, guarantees low-temperature start-up and low-voltage start-up of the burner motor without increasing costs, and achieves stable ignition performance. Is a first object, and a second object is to reduce noise when the burner motor is started.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention is directed to a combustion section having a vaporizing cylinder for fuel vaporization, and a fuel pump for supplying fuel to the combustion section. A burner motor for driving a fan that supplies combustion air to the combustion unit, a convection fan that blows heat generated in the combustion unit out of the apparatus main body as hot air, and detects and controls the temperature of a vaporizing cylinder of the combustion unit. Vaporization cylinder temperature control unit, a flame detection unit that detects the flame of the combustion unit, a room temperature detection unit that detects the room temperature, at the start of operation of the device, when the vaporization cylinder temperature reaches the first set temperature when the room temperature is low The burner motor is started at a first set rotation speed, and when the vaporization cylinder temperature reaches a second set temperature higher than the first set temperature, the burner motor is driven at a second set rotation speed. When the set temperature is reached There a structure in which the timer unit and the combustion control unit for activating the Banamota the second set rotation speed.

Further, in the second invention, the timer unit and the combustion control unit set the first set rotation speed to be lower than the second set rotation speed, and when the vaporization cylinder temperature reaches the second set temperature. If the burner motor does not reach the second set speed within the initial set time, the initial set time is released, the second set time is reset, and if the burner motor reaches the second set speed within the second set time, In this case, the ignition operation is immediately started, and if the rotation speed does not reach the second set rotation speed within the second set time, the operation is not shifted to the ignition operation as a burner motor abnormality.

[0007]

According to the first aspect of the present invention, when the room temperature is low, the burner motor starts earlier than at room temperature.
As a result, the aging effect of the burner motor increases, and at the time of ignition, a driving torque that is the same as that at normal temperature is obtained,
Stable ignition performance can be obtained even by environmental changes such as power supply voltage fluctuations, and it can sufficiently cope with a combustion device having a large heating output.

In the second configuration, the noise can be reduced by setting the first set rotation speed of the burner motor to be lower than the second set rotation speed. Furthermore, if the burner motor does not reach the second set rotation speed within the initial set time, the second set time is reset, and if the burner motor reaches the second set rotation speed within this second set time, the operation immediately proceeds to the ignition operation. This can ensure ignition and improve safety.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

First, the structure of a combustion apparatus will be described with reference to FIG. 4. Reference numeral 1 denotes an apparatus main body, 2 denotes a vaporization cylinder for vaporizing fuel and mixing it with combustion air, and the vaporization cylinder 2 has a heater 3 as a heating means. A vaporization cylinder temperature detection sensor 4 is embedded for detecting the vaporization cylinder temperature. Reference numeral 5 denotes a burner head which is mounted on the upper part of the vaporizing cylinder 2 and burns a mixed gas from the vaporizing cylinder 2 and serves as a combustion part. A flame detection sensor 6 for detecting a flame is provided around the burner head 5. is set up.
Reference numeral 7 denotes a fuel pump for supplying fuel into the vaporizing cylinder 2, and 8 denotes a burner fan for supplying combustion air into the vaporizing cylinder.
a is the burner motor. Reference numeral 9 denotes a convection fan that mixes with the combustion gas from the combustion section and blows out hot air from a hot air outlet 10 on the front surface of the device main body 1.

A control device 11 drives the fuel pump 7, the burner fan 8, and the convection fan 9 to control combustion. Reference numeral 12 denotes a room temperature detection sensor that detects the room temperature, which is installed in the device main body 1.

Next, the configuration of the control device 11 will be described with reference to the block diagram of FIG. 1. Reference numeral 13 denotes an operation command unit for giving a device operation start command to the room temperature detecting unit 14 and the vaporizing cylinder temperature control unit 15. A timer section that is started based on an output from the vaporization cylinder temperature control section;
The second timer section 16b, the third timer section 16c, and the fourth timer section 16d send signals to the burner motor 8a, the fuel pump 7, and the convection fan 9 until a predetermined time has elapsed. A combustion control unit 19 controls the burner motor 8a, the fuel pump 7, and the convection fan 9 based on signals from the timer unit 16, the vaporizing cylinder temperature control unit 15, and the flame detection unit 17, and the fourth timer unit 16d counts. When the burner motor 8 is turned on, the combustion amount is varied based on the outputs from the room temperature setting unit 18 and the room temperature detecting unit 14.
a, the fuel pump 7 and the convection fan 9 are controlled.

In the above configuration, the operation of the control device will be described next with reference to the flowchart of FIG. First, at step 20, when the operation command is confirmed, the vaporizing cylinder temperature controller 1
5 energizes the heater 3. On the other hand, the room temperature detection sensor 12 detects the room temperature level at the time of the operation command.

If the room temperature detecting sensor 12 determines in step 21 that the room temperature is low, for example, 0 ° C. or less, the vaporizing cylinder 2 which rises by energizing the heater 3 reaches the first set temperature by the vaporizing cylinder temperature detecting sensor 4. It is determined in step 22 whether the temperature has reached the set temperature, and the burner motor 8a is energized and started at the first set rotational speed.

Next, at step 23, if it is determined that the vaporizing cylinder 2 has reached the second set temperature higher than the first set temperature by energizing the heater 3, the rotation speed of the burner motor 8a is set to be lower than the first set rotation speed. The burner motor 8a is driven at the second set rotation speed until the first timer 16a is counted up at the same time as the second set rotation speed is increased.

In step 24, the first timer section 16a counts up. If it is determined in step 25 that the burner motor 8a is driven at the second set number of revolutions, the fuel pump 7 is driven to shift to the ignition operation.

On the other hand, even if the first timer 16a counts up in step 24, if it is determined in step 25 that the burner motor 8a has not reached the second set number of revolutions, the first timer 16a is initialized. And the second timer section 16b is started. Then, before the second timer section 16b is counted up in step 26,
It is determined whether or not the burner motor 8a reaches the second set rotation speed. When the burner motor 8a reaches the second set rotation speed, the fuel pump 7 is immediately driven and the third timer 16c is started.

Next, if the ignition is detected by the flame detection sensor 6 in step 28 before the third timer 16c counts up, the fourth timer 16d is started and the convection fan 9 is driven. And step 29
The burner motor 8a, the fuel pump 7, and the convection fan 9 are driven at predetermined values until the fourth timer 16d is counted up. Combustion amount by setting,
The burner fan speed and the convection fan speed are variable.

If it is determined in step 21 that the room temperature is not low by the room temperature detecting sensor 12, the burner motor 8a is energized only when the temperature of the vaporizing cylinder 2 reaches the second set temperature, and is driven at the second set speed. The same operation as described above is performed for the operation up to ignition.

Therefore, according to this embodiment, when the room temperature is low, the burner motor 8a starts earlier than at room temperature. As a result, the aging effect of the burner motor 8a is increased.
It is possible to obtain stable ignition performance even by environmental changes such as room temperature fluctuations and power supply voltage fluctuations, and it is possible to sufficiently cope with a combustion device having a large heating output.

By setting the first set speed of the burner motor 8a lower than the second set speed, noise at the time of starting the burner motor 8a can be reduced and the preheating time can be shortened. it can. Further, if the burner motor 8a does not reach the second set rotation speed within the initial set time, the second set time is reset, and if the burner motor 8a reaches the second set rotation speed within the second set time, the operation immediately proceeds to the ignition operation. By doing so, it is possible to ensure ignition and to improve safety.

In the above embodiment, an open-type combustion apparatus for supplying combustion gas as warm air has been described as an example. However, a closed-type combustion apparatus that exchanges heat with combustion gas and uses air from a convection fan as warm air is described. A similar effect can be obtained even with a burning appliance.

[0023]

As described above, the control device for a combustion apparatus according to the present invention can improve the drive characteristics of a burner motor without increasing the size and cost of the apparatus even when environmental changes such as room temperature fluctuations and power supply voltage fluctuations occur. And stable ignition performance can be obtained.

Further, the motor adopting the second structure can reduce the noise at the time of starting the motor, reduce the noise of the equipment, and when the burner motor reaches the second set rotation speed within the initial set time. If not, reset the second setting time,
By immediately shifting to the ignition operation when the second set number of revolutions is reached within the second set time, it is possible to ensure ignition and improve safety.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control apparatus for a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the control device;

FIG. 3 is a flowchart showing the operation of the control device;

FIG. 4 is a cross-sectional view showing an entire configuration of a combustion appliance using the control device.

[Explanation of symbols]

 2 Vaporization cylinder 3 Heater 5 Burner head (combustion unit) 7 Fuel pump 8a Burner motor 9 Convection fan 14 Room temperature detection unit 15 Vaporization cylinder temperature detection unit 16 Timer unit 17 Flame detection unit 19 Combustion control unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F23N 3/08 F23N 5/02 342

Claims (2)

(57) [Claims] A combustion unit having a vaporization cylinder for vaporizing fuel;
A fuel pump that supplies fuel to the combustion unit, a burner motor for driving a fan that supplies combustion air to the combustion unit, a convection fan that blows heat generated in the combustion unit out of the apparatus main body as warm air, A vaporizing cylinder temperature control unit that detects and controls the vaporizing cylinder temperature of the combustion unit, a flame detection unit that detects the flame of the combustion unit, a room temperature detection unit that detects the room temperature, and when the operation of the device starts, when the room temperature is low When the vaporization cylinder temperature reaches the first set temperature, the burner motor is started at the first set rotation speed, and when the vaporization cylinder temperature reaches the second set temperature higher than the first set temperature, it is driven at the second set rotation speed, On the other hand, when the room temperature is normal temperature, a control device for a combustion appliance comprising a timer unit and a combustion control unit for starting the burner motor at the second set rotation speed when the vaporization cylinder temperature reaches the second set temperature. 2. The timer unit and the combustion control unit set the first set rotation speed to a lower rotation speed than the second set rotation speed, and when the temperature of the carburetor reaches the second set temperature, the burner motor is controlled within the initial set time. If does not reach the second set speed, the initial set time is released, the second set time is reset, and if the second set speed is reached within this second set time, the operation immediately proceeds to the ignition operation 2. The control apparatus for a combustion appliance according to claim 1, wherein the burner motor abnormality is not caused to proceed to the ignition operation unless the second set number of revolutions is reached within the second set time.