JP3136817B2 - 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 As shown in FIG. 3, a conventional burner of this type is energized to a heater 3 at the start of operation, and when a vaporizing cylinder 2 reaches a set temperature, a burner fan 8 is driven to energize a fuel pump 7. It is ignited. At this time, the ratio (m value) of the actual air amount to the theoretical air amount is set low. Further, after the ignition is determined, the combustion is forcibly burned at the maximum combustion amount for a certain period of time, and thereafter, the combustion amount is varied according to the difference between the set temperature and the room temperature.

[0003]

However, in the above-mentioned conventional control device, the temperature of the flame detection sensor 6 is quickly raised by forcibly burning the fuel at the maximum combustion amount for a certain period of time after the ignition determination to increase the flame output of the sensor. Yes, but
Since the m value at the time of this combustion is usually the same as the m value at the time of stable combustion, especially when the burner portions such as the vaporizing cylinder 2 and the burner head 5 are cold, the adhesion of the flame formed on the burner head 5 is reduced. Some combustion was unstable immediately after ignition, such as worsening, causing lifting combustion, odor due to generation of unburned gas, and generation of abnormal noise due to lifting of the flame.

[0004] The present invention has been made to solve the above-mentioned problems, and has as its object to increase the stability of a flame immediately after ignition and to ensure good combustion performance.

[0005]

In order to solve the above-mentioned conventional problems, the present invention provides a vaporizing cylinder for vaporizing fuel, a burner head for burning vaporized gas from the vaporizing cylinder, and supplying fuel to the vaporizing cylinder. A burner fan that supplies combustion air to the fuel pump and the vaporizing cylinder, a convection fan that blows out the combustion gas outside the main body as hot air, a flame detection sensor that detects a flame, and a vaporizing cylinder that controls the vaporizing cylinder temperature A temperature control unit, a combustion control unit that controls the amount of combustion by driving a fuel pump, a burner fan, and a convection fan, and energizes a heater, a burner fan, a fuel pump, and a convection fan based on an output from the carburetor temperature control unit. A timer unit for controlling, when the timer unit receives an output from the vaporization cylinder temperature control unit indicating that the vaporization cylinder temperature has reached the set temperature, the burner fan is normally in a stable state. A first timer section which starts at a medium rotation speed lower than the maximum combustion amount, a second timer section which starts by counting up the first timer section, counts up after a predetermined time and starts a convection fan, and flame detection A third timer section which is activated by an ignition detection output from the sensor and counts up after a predetermined time to change the burner rotation speed, and is activated by a count-up of the third timer section and time-ups after a predetermined time to set temperature and room temperature. And a fourth timer unit for returning to the normal combustion amount control determined by the above.When the first timer unit counts up, the fuel pump is driven to discharge fuel corresponding to the maximum combustion amount during normal stable combustion. When the ignition operation is performed and the second timer counts up, the convection fan is started at a rotation speed equivalent to the maximum combustion amount of the normal stable combustion amount. When the third timer section counts up, the burner fan is changed from the medium rotation number to a rotation number lower than the rotation number corresponding to the maximum combustion amount during normal stable combustion and higher than the medium rotation number, and the fourth timer section counts. When burned up, the burner set forcibly
The configuration is such that the values of the rotation speed and the combustion amount are released, and the control returns to the normal combustion amount control determined at the set temperature and room temperature.

[0006]

According to the present invention, the first timer section has the above configuration.
The number of revolutions of the burner fan started by
When the number of rotations is set to the medium speed for the purpose of suppressing as much as possible, and the count-up of the third timer section, that is, the determination of the ignition stability is performed, the fuel pump is operated up to the maximum combustion amount until the fourth timer section is started and counted up. The fuel is discharged, and the burner fan is rotated from the medium rotation speed to a rotation speed lower than the set rotation speed corresponding to the maximum combustion amount during normal stable combustion .
Since remote is changed to a higher rotational speed (combustion in conventional low m value than the set value m of the stable combustion), lifting of the flame burner unit immediately after the ignition is formed in the burner head in the case of the cold Can be prevented, and generation of unburned gas and generation of lift noise due to lifting combustion can be suppressed. Further, since the rotation speed of the burner fan is driven at a low rotation speed, combustion noise can be reduced, and a comfortable combustion device with high safety can be provided even in an unstable transient period immediately after the start of combustion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, the configuration of the combustion equipment will be described with reference to FIG. 3. Reference numeral 1 denotes an equipment main body, 2 denotes a vaporization cylinder for vaporizing fuel and mixing it with combustion air. Sensor 4 is embedded. Reference numeral 5 denotes a burner head which is mounted on the upper portion of the vaporizing cylinder 2 and burns a mixed gas from the vaporizing cylinder 2. A flame detecting sensor 6 such as a flame rod for detecting a flame is provided around the burner head 5. . 7 is a fuel pump for supplying fuel into the vaporizing cylinder 2; 8 is a burner fan for supplying combustion air into the vaporizing cylinder 2; 9 is hot air blowing on the front of the apparatus body 1 by mixing with combustion gas from the burner head. It is a convection fan that blows out hot air from the outlet 10.

Reference numeral 11 denotes a control device for controlling the combustion by driving the fuel pump 7, the burner fan 8, and the convection fan 9. The configuration of the control device 11 will be described with reference to the block diagram of FIG. 1. Reference numeral 12 denotes an operation command unit for giving a device operation start command to the carburetor temperature control unit 13, and reference numeral 15 denotes a timer unit which starts when receiving an operation start signal. Thus, the first timer unit 15a, the second timer unit 15b, and the third timer unit 15
c, a fourth timer section 15d, which sends signals to the burner fan 8, the fuel pump 7, and the convection fan 9 until a predetermined time elapses. The flame detecting section 14 sends an output signal to the burner fan 8, the fuel pump 7, and the convection fan 9 until the third timer section counts up and performs ignition detection. Thereafter, when the fourth timer section counts up, an output signal is given from the combustion control section 18 to the burner fan 8, the fuel pump 7, and the convection fan 9 based on the outputs from the room temperature setting section 16 and the room temperature detecting section 17, and the amount of combustion is increased. Is made to be variable.

Next, the operation of the control device in the above configuration will be described with reference to the flowchart of FIG. First, when the operation command is confirmed in step 19, the vaporization cylinder temperature control unit 13
Energizes the heater 3, determines whether the vaporization cylinder 2 has reached the set temperature by the vaporization cylinder temperature sensor 4, and if the temperature reaches the set temperature, energizes the burner fan 8 and starts the first timer section 15a. Let it. Then, it is determined in step 20 whether or not the first timer unit 15a counts up. Until the count-up, the burner fan 8 operates at the medium rotation speed (M rotation speed) lower than the maximum combustion amount during normal stable combustion. ).

When the first timer section 15a counts up, the fuel pump 7 is strongly driven to discharge fuel corresponding to the maximum combustion amount during normal stable combustion, an ignition operation is performed, and the second timer section 15a is operated. 15b is started.
Then, in a step 21, it is determined whether or not the second timer section 15b counts up , and in a step 22, it is determined whether or not the flame detection sensor 6 has performed the ignition detection.
Here, when the ignition is performed normally, the ignition is detected earlier, so that the ignition is normally detected and the burner fan 8 and the fuel pump 7 are driven as they are to activate the third timer 15c. During this time, the second timer section 15b counts up, and the count-up causes the convection fan 9 to be started at a rotation speed equivalent to the maximum combustion amount during normal stable combustion.

Next, it is determined in step 23 whether or not the third timer unit 15c has counted up. If the count has been counted up, the flame detection unit 14 determines that the ignition has stabilized based on the output from the flame detection sensor 6, 4th timer part 1
5d is activated. Here, the burner fan 8 is at a medium rotation speed (M rotation speed) from the time when the first timer unit 15a is activated to the time when the third timer unit 15c counts up. Three timer unit 15
The fuel pump 7 is driven in a strong drive until c counts up, and the convection fan 9 is driven in a strong rotation from the second timer 15b counts up to the third timer 15c counts up. .

If the fourth timer section 15d is started in this state, the fuel pump 7 is driven at a high speed corresponding to the maximum combustion amount as described above, and the convection fan 9 is driven at the same high speed until the fourth timer section 15d counts up. to continue. Meanwhile burner fan 8
Is usually a high engine speed (H
The rotation speed is increased to a rotation speed (H ′ rotation speed) lower than the rotation speed) but higher than the middle rotation speed. Thereafter, it is determined in step 24 whether the fourth timer unit 15d has counted up.
If it is determined that the count has been increased, the combustion control unit 18 enters the temperature control based on the outputs from the room temperature setting unit 16 and the room temperature detection unit 17 in which the combustion amount is set to any of high to low.

Therefore, according to this embodiment, it is determined in step 23 whether or not the third timer section 15c has counted up, and it is determined that the ignition has been stabilized (after about 10 seconds, the output of the flame detection sensor 6 becomes a predetermined level). Then, the fourth timer unit 15d is activated, and regardless of the signals from the room temperature setting unit 16 and the room temperature detection unit 17, the forced Hi combustion is performed until the fourth timer unit 15d counts up (about 1 minute). I do.

In the forced Hi combustion, the fuel pump 7 and the convection fan 9 perform a strong drive corresponding to the maximum combustion amount during normal stable combustion, while the burner fan 8 operates at the H rotation speed corresponding to the maximum combustion amount during normal stable combustion. In order to drive the burner fan 8 at a lower H 'rotation speed, the burner portion immediately after ignition, particularly, a yellow fire which is likely to occur when fuel rich is excessively large, such as when the burner fan 8 is continuously rotated at a middle rotation speed, particularly Even when the vaporizing cylinder 2 and the burner head 5 are cold, the flame formed by the burner head 5 becomes a stable flame without lifting, and the generation of unburned gas and the lifting noise due to the lifting of the flame can be prevented. . Further, since the output of the flame detection sensor 6 rises quickly and stabilizes due to the formation of a stable flame, it is possible to prevent the stop of combustion due to the decrease in output. Furthermore, since the number of revolutions of the burner fan 8 is set low, combustion noise is also reduced, and a highly comfortable combustion device can be provided.

[0015]

As described above, the combustion apparatus of the present invention can increase the stability of a flame immediately after ignition while preventing the occurrence of yellow flame, that is, can prevent the generation of unburned gas and lift noise, and also provide a flame sensor. Can also prevent combustion stoppage due to reduced output of
Furthermore, combustion noise can be reduced, and a highly safe and highly comfortable combustion device can be provided.

[Brief description of the drawings]

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

FIG. 2 is a flowchart of the apparatus.

FIG. 3 is a cross-sectional view showing the overall configuration of the present invention and a conventional combustion device.

[Explanation of Signs] 2 carburetor 3 heater 5 burner head 6 flame detection sensor 7 fuel pump 8 burner fan 9 convection fan 13 carburetor cylinder temperature controller 15 timer 15a first timer 15b second timer 15c third timer 15d Fourth timer unit 18 Combustion control unit

Claims (1)

(57) [Claims] 1. A vaporizing cylinder for vaporizing fuel, a burner head for burning vaporized gas from the vaporizing cylinder, a fuel pump for supplying fuel to the vaporizing cylinder, and a burner fan for supplying combustion air to the vaporizing cylinder. A convection fan that blows out combustion gas as hot air to the outside of the device body, a flame detection sensor that detects a flame, a vaporization cylinder temperature control unit that controls the vaporization cylinder temperature, and a fuel pump, a burner fan, and a convection fan. A combustion control unit that controls the amount of combustion; and a timer unit that controls energization of a heater, a burner fan, a fuel pump, and a convection fan based on an output from the vaporization cylinder temperature control unit. When the burner fan receives the output indicating that the temperature of the carburetor has reached the set temperature from the section, the burner fan is started at a medium rotation speed lower than the maximum combustion amount in normal stability And a second timer section which starts up by counting up the first timer section and counts up after a predetermined time to start the convection fan, and starts up by an ignition detection output from the flame detection sensor and counts up after a predetermined time period. A third timer unit for changing the burner rotation speed, and a fourth timer unit for starting up by counting up the third timer unit, starting up after a predetermined time, and returning to normal combustion amount control determined at a set temperature and room temperature. When the first timer section counts up, the fuel pump is driven to discharge fuel equivalent to the maximum combustion amount during normal stable combustion and performs an ignition operation, and when the second timer section counts up, the convection fan Is started at a rotation speed equivalent to the maximum combustion amount of the normal stable combustion amount, and when the third timer counts up, the burner fan Change from the intermediate rotational speed usually a rotational speed higher than the rotating speed lower than the rotational speed of the corresponding maximum combustion amount of the stable combustion burner rotational speed was set to the forcing and the fourth timer unit counts up
And a control device for the combustion appliance which releases the value of the combustion amount and returns to the normal combustion amount control determined by the set temperature and the room temperature.