JPH02282615A - Burner - Google Patents

Abstract

PURPOSE:To eliminate the waste of driving power for a blower and save the electric power consumption by taking in the necessary amount of air in changing the revolution of the blower in linkage with the burning amount of oil of a burner. CONSTITUTION:At a fuel supply pipe 8 a flow control valve 9 is installed and the valve is so controlled to make a specified valve opening by a valve opening signal from a combustion controller 10 controlling combustion. Then, when the valve opening signal fed into a frequency setting device 12, the frequency of an inverter output corresponding to the valve opening s calculated by a central processing unit 13 in referring to the valve opening memorized in a memory 14 and the frequency of the inverter output corresponding to the valve opening. The delivered frequency is conveyed in a form of digital signals and converted into analog signals by D/A converter 17 and the analog signals are impressed to an inverter 18 as a frequency converter. Thereby, the inverter 18 revolves the motor 4a of an axial-flow blower 4 at the frequency corresponding to the amount of the analog signals.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a burner equipped with a fuel injection nozzle and a blower.

[Prior art 1] In conventional burners, the rotation speed of the blower that supplies the amount of air necessary for fuel combustion is kept constant, and the air volume that matches the combustion amount is adjusted by adjusting the opening amount of the air volume adjustment damper. It has gained.

[Problems to be Solved by the Invention] However, for example, in a hydraulic burner that pressurizes the fuel oil itself and sprays it from pores to atomize it, the number of rotations of the five blowers is kept constant, and the damper is turned off during low combustion. It can be said that rotating the blower at high speed while restricting the opening as in the case of high combustion is a wasteful use of blower power. Further, the method of controlling the air volume while adjusting the opening degree of the damper does not allow precise air volume control over the amount of fuel oil.

Furthermore, as a type of hydraulic burner, an axial flow burner is known as a compact burner in which a fuel injection nozzle and an axial flow blower are housed in a cylindrical body.Similarly to the above, this axial flow burner also has an air volume that can be adjusted by adjusting the opening of the damper. is increasing or decreasing. The general characteristics of the axial blower used in this axial flow burner are that it has stable performance at large air volume and low pressure, but when the air volume decreases, surging noise is generated due to the surging phenomenon, making the air blowing extremely unstable. Therefore, this type of axial flow burner has the drawback that if the combustion amount is lowered, the axial flow blower is forced to be used in an unstable manner, and the combustion state becomes unstable.

Therefore, in view of the above points, it is an object of the present invention to propose a burner that reduces the driving power of the blower, precisely controls the air volume, stabilizes combustion, and reduces noise during low combustion. .

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a burner equipped with a fuel injection nozzle and a blower, in which the electric motor of the blower is equipped with a frequency converter, and the frequency converter has a storage device. The storage device stores a frequency corresponding to the valve opening degree of the flow control valve provided in the fuel supply pipe, and the frequency setting device stores the frequency corresponding to the valve opening degree of the flow rate control valve provided in the fuel supply pipe. The present invention provides a burner characterized in that the frequency is inputted into a frequency setting device, a frequency corresponding to the valve opening is calculated, and the frequency is outputted to a frequency converter to change the rotation speed of the blower.

[Function] According to the burner according to the present invention, in order to adjust the combustion amount, the combustion control device outputs a valve opening signal to the flow rate control valve, and at the same time outputs this valve opening signal to the frequency setting device,
A frequency that matches the valve opening is calculated from the relationship between the frequencies corresponding to the valve opening of the flow control valve stored in the storage section of the frequency setting device, and this frequency signal is output to the frequency converter to rotate the blower motor. This makes it possible to supply an air volume commensurate with the amount of combustion.

[Example] Embodiments of the present invention will be described below based on the drawings.

■ is an axial burner which is a type of hydraulic burner, and has a fuel injection nozzle 3 and an axial blower 4 inside the cylindrical body 2.
Air necessary for combustion is sucked in from the end of the cylindrical body 2, and high-pressure oil is injected from the fuel injection nozzle 3 to cause combustion.

The axial blower 4 consists of a drive motor 4a, a rotor blade 4b attached to the drive motor 4a, and a stationary blade (straightening blade) 4c fixed to the inner wall of the cylindrical body 2. Combustion air is generated by rotation of the rotor blade 4b. is sucked through the air intake port 5 at one end of the cylindrical body 2, passed through the cylindrical body 2, and exhausted to the fuel injection nozzle 3 side. 6 is a flame stabilizing plate placed on the entire surface of the combustion injection nozzle 3 to realize a stable flame shape, and the fuel injected from the combustion injection nozzle 3 is passed through the ignition device 7.
ignited by. A fuel supply pipe 8 supplies fuel to the fuel injection nozzle 3, and is connected to a fuel supply source (not shown) via a hydraulic pump. This fuel supply pipe 8 is provided with a flow control valve 9, and the flow control valve 9 is controlled to a predetermined valve opening by a valve opening signal from a combustion control device 10 that controls combustion.

The valve opening signal from the combustion control device 10 is output to the flow rate control valve 9, and at the same time, it is converted into a digital signal by the A/D converter 11 and taken into the 1-frequency setting device 12.

The frequency setting device 12 includes a central processing unit 13 and a storage device 14.
The frequency of the inverter output corresponding to the valve opening degree of the flow control valve 9 provided in the fuel supply pipe 8 is stored in advance in the storage device 14. Reference numeral 15 denotes a display device used when storing data in the storage device 14, and is used to set a frequency corresponding to the valve opening degree on the screen of this display device 14. and the frequency of the inverter output corresponding thereto are inputted at a plurality of points and stored in the storage device 14 via the central processing unit 13.

When the valve opening signal is input to the frequency setting device 12, the central processing unit 13 determines the inverter output corresponding to the valve opening while referring to the valve opening stored in the storage device 14 and the frequency of the inverter output corresponding to the valve opening. Calculate the frequency.

The frequency calculated by the frequency setting device 12 is output as a digital signal, converted to an analog signal by a D/A converter 17, and the analog signal is applied to an inverter 18, which is a frequency converter. As a result, the inverter 18 rotates the electric motor 4a of the axial blower 4 at a frequency corresponding to the analog signal amount.

When the combustion control device 10 outputs a valve opening signal to the flow rate control well 9 to adjust the combustion amount, the valve opening signal is also output to the frequency setting device 12 and stored in the storage device 14 in advance. A frequency suitable for the valve opening signal is calculated by referring to the valve opening and the corresponding frequency data of the inverter output, and this frequency signal is output to the inverter 18. The inverter 18 operates the electric motor 4a of the axial blower 4 at this frequency.
Since it rotates, it is possible to take in the optimal air volume for the combustion amount in conjunction with the amount of oil injected from the combustion injection nozzle 3.

In the above embodiment, an axial flow burner was described, but this is not limited to an axial flow burner (any hydraulic burner that pressurizes the fuel oil itself and jets it out from pores to atomize it can be used). Of course, the fuel is not limited to oil, but may also be gas or pulverized coal.

In addition, although the combustion amount of the burner is adjusted by adjusting the valve opening of the flow control valve, changes may be made within the scope of the technical idea of the present invention, such as supplying fuel instead of controlling the valve opening of the flow control valve. The technical scope of the present invention includes adjusting the combustion amount by controlling the rotation of the pump.

[Effects of the Invention] As described above, according to the burner according to the present invention, the rotational speed of the blower is changed in conjunction with the amount of oil burned in the burner to take in the required amount of air. Not only can air volume be controlled accurately, but the driving power of the blower is not wasted (power consumption can be saved).

Furthermore, when the burner burns low, the rotational speed of the axial blower also decreases, resulting in less noise.

Furthermore, axial flow burners, which are a type of hydraulic burner, do not suffer from the surging phenomenon that occurs in medium to low air volume ranges, unlike conventional axial flow blowers. Stable combustion can be achieved even with a small air volume, and a quiet burner that does not generate surging noise can be achieved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a burner according to the present invention. 1... Axial flow burner 3... Fuel injection nozzle 4...
- Axial flow blower 4a - Electric motor 8... Fuel supply pipe 9... Flow rate control valve 10... Combustion control device 12
・-・Frequency setting device 18...Frequency converter (inverter) Fig. 1

Claims (1)

[Claims] In a burner equipped with a fuel injection nozzle and a blower,
The electric motor of the blower is equipped with a frequency converter, the frequency converter is equipped with a frequency setting device having a storage device, and the storage device stores a frequency corresponding to the valve opening degree of a flow control valve provided in the fuel supply pipe. Then, the valve opening signal of the flow control valve output by the combustion control device is input into the frequency setting device, and a frequency corresponding to the valve opening is calculated and output to the frequency converter to change the rotation speed of the blower. A burner characterized in that it is configured to cause