JPH0631308Y2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to stabilization of combustion in a liquid fuel combustion apparatus.

[Conventional technology]

FIG. 3 is a sectional view showing a conventional liquid fuel combustion apparatus, FIG. 4 is a sectional view taken along the line IV-IV of FIG. 3, and FIG. 5 is a perspective view showing a configuration of a conventional wind tunnel portion.

In these drawings, 1 is an outer case of the apparatus, 2 is a fuel tank of a cartridge type, 3 is a bottom plate, 4 is a fuel tray provided directly below the fuel tank 2, 5 is a fuel supply pump, 6 is a fuel supply pipe, 7 Is a fuel vaporizer, 8 is a sheath heater for preheating the vaporizer, 9 is a fuel jet nozzle communicated with the vaporizer 7, 10 is a solenoid valve for controlling the opening and closing of the nozzle hole of the fuel jet nozzle 9, and 11 is A burner, 12 is a spark plug for igniting the fuel gas, 13 is a combustion cylinder provided so as to cover the periphery of the burner 11, 14 is a wind tunnel provided so as to cover the combustion cylinder 13, and 15 is a hot air outlet 16. Front panel,
Reference numeral 17 denotes a propeller fan that is provided on the back surface of the outer case 1 and sends the combustion gas in the wind tunnel 14 to the outside from the warm air outlet 16 as warm air, and 19 is a hole formed on the bottom surface of the wind tunnel 9.

Next, the operation will be described. Liquid fuel such as kerosene flows from the fuel tank 2 in the direction of the arrow, and is held on the fuel tray 4 at an oil level of a constant height.

On the other hand, when the sheath heater 8 is energized and generates heat, the carburetor 7 is heated, and when it reaches a predetermined temperature, the fuel supply pump 5
Is driven. The liquid fuel is sent to the carburetor 7 via the fuel supply pipe 6, where it is immediately vaporized.

Then, the electromagnetic valve 10 is excited, the needle valve in the fuel injection nozzle 9 is attracted, the nozzle hole is opened, and the fuel gas is ejected into the burner 11. At this time, due to the ejector effect, the fuel gas attracts the surrounding primary air and mixes with the primary air.

When a spark is generated in the ignition plug 12, the air-fuel mixture supplied to the burner 11 is ignited to form a flame, which is mixed with secondary air in the combustion cylinder 13 and completely burned. The high temperature combustion gas is further mixed and equalized with the secondary air in the wind tunnel 14 by the wind of the propeller fan 17, and then flows out from the warm air outlet 16 of the front panel 15 as high temperature warm air to the outside.

On the other hand, the operation is stopped by first stopping the operation of the fuel supply pump 5 and stopping the supply of the liquid fuel, and then demagnetizing the electromagnetic valve 10 with a slight delay to release the fuel injection nozzle 9
The operation is performed by returning the needle valve in the inside, closing the nozzle hole at its tip, and stopping the operation of the propeller fan 17.

[Problems to be solved by the device]

Since the conventional liquid fuel combustion device is configured as described above, in order to send the primary air to the burner 11 by the ejector effect, the nozzle hole diameter of the fuel injection nozzle 9 is made small, and the injection output of the fuel gas is made. Needed to be up. For this reason, there is a problem that the jetting noise becomes loud and the comfort is impaired, and when the front panel 15 is removed, the inside of the main body becomes an atmospheric pressure level, the pushing pressure of the primary air into the burner 11 is reduced, and the combustion becomes red fire. However, there were problems such as odors and soot generated during combustion inspection during assembly and service, and troubles such as the operation of safety devices.

The present invention has been made to solve the above problems, and it is not necessary to reduce the nozzle hole diameter of the fuel injection nozzle to increase the injection output of fuel gas. An object of the present invention is to obtain a liquid fuel combustion device that can perform sufficient combustion.

[Means for Solving the Problems]

The liquid fuel combustion apparatus according to the present invention is designed so that the wind from the propeller fan is provided between the inner surface of the wind tunnel on the side opposite to the rotation direction of the propeller fan and the combustion cylinder, and below the vicinity of the combustion gas outlet in the upper part of the combustion cylinder. The wind direction plate is provided to direct a part of the flow in the direction along the inclination of the wind tunnel.

[Action]

In the liquid fuel combustion apparatus according to the present invention, the wind of the propeller fan is rectified by the wind direction plate, the flow velocity is reduced, the pressure in the combustion cylinder is reduced, and at the same time, the pressure of pushing the primary air into the burner is increased, and the vicinity of the nozzle is increased. The pressure difference from the internal pressure of the combustion cylinder becomes large, so that the primary air can more easily enter the burner, and the green flame can be burned sufficiently.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a liquid fuel combustion apparatus showing an embodiment of the present invention, and FIG. 2 is a partially cutaway perspective view of a wind tunnel portion thereof.

In FIGS. 1 and 2, 18a, 18b and 18c are wind direction plates, which are provided between the inner surface of the wind tunnel on the side opposite to the rotation direction of the propeller fan 17 and the combustion cylinder as shown in the figure. .

Reference numeral 19 denotes a hole provided on the bottom surface of the wind tunnel 14, which is provided at a position where the wind and pressure of the propeller fan 17 go to the installation space side of the fuel injection nozzle 9.

Next, the operation of each of the wind direction plates 18a, 18b, 18c will be described.

The wind from the propeller fan 17 flows along the slope of the wind tunnel 14, but since the propeller fan 17 rotates in the direction of arrow A in FIG. 2, the wind direction plate 18a, on the side of the wind starting point (opposite to the rotating direction), The rectifying action is greater when 18b and 18c are provided. The air flow direction vanes 18a and 18b reduce the wind speed of the combustion gas outlet 13a above the combustion cylinder 13 by this rectifying action, and reduce the internal pressure of the combustion cylinder 13.

Further, the current plate 18c functions to send the wind from the propeller fan 17 to the fuel injection nozzle 9 side through the hole 19 on the bottom surface of the wind tunnel 14 and increase the pressure in the vicinity of the fuel injection nozzle 9.

Due to both of these effects, the pressure difference between the pressure in the vicinity of the fuel injection nozzle 9 and the internal pressure of the combustion cylinder 13 is further increased. According to the actual measurement, the differential pressure is about 1.0 mmAg in the conventional example, but about 2.0 mmAg in this example.
It has been confirmed that the amount of primary air entering the burner 11 increases, and complete combustion is achieved with a blue fire. Even when the front panel 15 is removed, even if the pressure inside the main body reaches the atmospheric pressure level and the pushing pressure from the propeller fan 17 to the vicinity of the combustion ejection nozzle 9 decreases, the wind direction plate 18
Since the internal pressure of the combustion cylinder 13 decreases due to the action of a and 18b, the differential pressure between the vicinity of the ejection nozzle 9 and the internal pressure of the combustion cylinder 13 spreads in the pushing direction. Therefore, the ejector effect due to the normal ejection force of the fuel gas from the ejection nozzle 9 Only by itself, the primary air can be sufficiently taken into the burner 11, and although it is slightly inferior to the case where the front panel 15 is provided, a complete blue flame causes complete combustion.

Therefore, no odor or soot is emitted, and it is not necessary to reduce the nozzle hole diameter of the fuel ejection nozzle 9, so that the ejection noise can be made quiet.

In the above embodiment, the three wind direction plates 18a, 18b, 1
Although 8c is provided, the number and shape thereof are appropriately changed according to the gap on the inner surface of the wind tunnel 14, and are not limited to the structure of this embodiment.

[Effect of device]

As described above, according to the present invention, the wind direction plate is provided between the combustion tube and the inner surface of the wind tunnel on the side opposite to the rotation direction of the propeller fan.
And provided below the vicinity of the combustion gas outlet in the upper part of the combustion cylinder,
Since a part of the wind flow of the propeller fan is directed toward the direction along the inclination of the wind tunnel, the pressure difference between the combustion cylinder pressure and the fuel injection nozzle becomes large, and the primary air is supplied in the direction to be pushed in. Therefore, the primary air can be sufficiently supplied without increasing the jetting power of the fuel gas,
There is an effect that a quiet and stable blue flame combustion can be obtained, and a safe and comfortable liquid fuel combustion device can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid fuel combustion apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view showing a wind tunnel part of the apparatus, and FIG. 3 is a sectional view showing a conventional liquid fuel combustion apparatus. FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is a perspective view of a conventional wind tunnel portion. In the figure, 9 is a fuel injection nozzle, 11 is a burner, 1
3 is a combustion cylinder, 13a is a combustion gas outlet, 14 is a wind tunnel, 17
Is a propeller fan, and 18a, 18b and 18c are wind direction plates. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshikazu Terauchi 800 Iwamatsu, Oshima-cho, Nitta-gun, Gunma Sanryo Electric Co., Ltd. Gunma Manufacturing (72) Fumiyoshi Futami 800 Iwamatsu, Oshima-machi, Nitta-gun, Gunma Prefecture Address Sanryo Electric Engineering Co., Ltd.Tokyo Office Gunma Branch

Claims (1)

[Scope of utility model registration request] 1. A liquid fuel in which vaporized liquid fuel is ejected from a fuel ejection nozzle, primary air is taken in from the surroundings by this ejection force, and burned in a burner, the upper part of the front surface is inclined while covering the periphery of the burner. A combustion cylinder, a wind tunnel that covers the combustion cylinder and has a box-shaped upper part that is inclined similarly to the combustion cylinder, and a propeller fan that is installed on the rear surface and blows air into the wind tunnel, and the rotation direction of the propeller fan. Between the inner side surface of the wind tunnel on the opposite side and the combustion cylinder and below the vicinity of the combustion gas outlet in the upper part of the combustion cylinder, a part of the flow of wind from the propeller fan is directed along the inclination of the wind tunnel. A liquid fuel combustion device, characterized in that it is provided with a wind direction plate directed toward the air.