JPH0752529Y2 - Hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to stabilization of combustion in a hot air heater.

[Conventional technology]

FIG. 3 is a sectional view showing a conventional warm air heater, and FIG.
FIG. 5 is a cross-sectional view taken along the line IV-IV of FIG. 5, and is a perspective view showing a configuration of a conventional wind tunnel with a part cut away.

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 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. A front panel, 17 is provided on the back side of the outer case 1, a propeller fan for sending 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 in the bottom of the wind tunnel 14. is there.

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.

After that, the solenoid valve 10 is excited, the needle valve in the fuel injection nozzle 9 is sucked, the nozzle hole is opened, and the fuel gas is burned.
Eject within 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 on the spark plug 12, the burner 11
The mixture is ignited to form a flame and the combustion cylinder 13
It mixes with secondary air inside and burns completely. 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 de-energizing the solenoid valve 10 with a slight delay to release the needle valve in the fuel injection nozzle 9. Is performed, the nozzle hole is closed at its tip, and the operation of the propeller fan 17 is also stopped.

[Problems to be solved by the device]

Since the conventional warm air heater is configured as above,
In order to send the primary air to the burner 11 by the ejector effect, it was necessary to reduce the nozzle hole diameter of the fuel injection nozzle 9 and increase the injection output of the fuel gas. For this reason, the sound of jetting becomes loud and the comfort is impaired, and when the front panel 15 is removed, the inside of the main body becomes the atmospheric pressure level, the pressure of pushing the primary air into the burner 11 is reduced, and the fire burns. 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. The purpose is to obtain a warm air heater capable of sufficient combustion.

[Means for Solving the Problems]

In the warm air heater according to the present invention, liquid fuel is vaporized and injected from a fuel injection nozzle, and primary air is taken from the surroundings by the injection output and burned by a burner so as to cover the periphery of the burner. A combustion cylinder provided, a wind tunnel provided so as to cover the combustion cylinder, and a propeller fan that is installed on the rear surface of the wind tunnel and sends the combustion gas in the wind tunnel as warm air from the warm air outlet to the outside of the machine. Providing a wind direction plate provided with a plurality of cut and raised pieces for partially downwardly changing the flow of air blown from the propeller fan along one side surface in the wind tunnel, and the fuel on the bottom surface of the wind tunnel on the propeller fan side. A hole communicating with the installation space of the injection nozzle is provided.

[Action]

In the warm air heater 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 decreased, and at the same time, the pushing pressure of the primary air into the burner is increased, and the vicinity of the nozzle and the combustion cylinder are increased. The pressure difference from the internal pressure becomes large, making it easier for the primary air to enter the burner, making it possible to burn the green flame sufficiently.

〔Example〕

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

FIG. 1 is a perspective view of a wind tunnel portion showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which a wind direction plate is incorporated in the wind tunnel.

In FIGS. 1 and 2, 18 is a plurality of cut and raised pieces 18a, 18b,
An air flow guide plate 18c is formed, and is provided along one side surface in the wind tunnel 14 as illustrated.

Reference numeral 19 is a hole provided on the bottom surface of the wind tunnel 14, 20 is an engaging piece formed on one end side of the wind direction plate 18, and 21 is a notch formed on the other end side of the wind direction plate 18.

Reference numerals 22 and 23 denote notches and engaging pieces formed on one side surface of the wind tunnel 14 corresponding to the engaging pieces 20 and the notches 21, and slide the wind direction plate 18 from the rear portion of the wind tunnel 14 as shown in FIG. And the engaging piece 23 are engaged with each other, and the engaging piece 20
And the notch 22 are engaged and fixed.

Next, the action of each cut-and-raised piece 18a, 18b, 18c of the wind direction plate 18 will be described.

The wind from the propeller fan 17 is blown from the rear of the wind tunnel 14 to the front, but by the first and second cut-and-raised pieces 18a, 18b,
The wind flowing in the upper part along one side surface in the wind tunnel 14 is subjected to the rectifying action, the direction is changed downward, the wind speed of the combustion gas outlet 13a in the upper part of the combustion cylinder 13 is reduced, and the internal pressure of the combustion cylinder 13 is reduced. .

Further, part of the wind from the propeller fan 17 is sent to the combustion jet nozzle 9 side from the hole 19 on the bottom surface of the wind tunnel 14 by the third cut and raised piece 18c, and the pressure in the vicinity of the fuel jet nozzle 9 is increased.

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 actual measurement, the pressure difference is about 1.0 mmAg in the case of the conventional example. In the example, it is about 2.0 mmAg, which is doubled, and the primary air is burner 1
It has been confirmed that the amount that enters into 1 also increases and that it burns completely with a blue fire. Even when the front panel 15 is removed, the internal pressure of the combustion cylinder 13 is reduced by the action of the air flow direction plates 18a and 18b 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 fuel injection nozzle 9 decreases. Since the differential pressure between the vicinity of the jet nozzle 9 and the internal pressure of the combustion cylinder 13 spreads in the pushing direction, the primary air is sufficiently supplied to the burner 11 only by the ejector effect of the normal jet output of the fuel gas from the jet nozzle 9. It can be used for a while and is slightly inferior to the case where the front panel 15 is provided, but it burns completely with sufficient blue fire.

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 addition, in the above-mentioned embodiment, three cut and raised pieces are attached to one wind direction plate 18.
18a, 18b, 18c were formed.
It can be appropriately modified according to the gap and shape of the inner side surface, and is not limited to the structure of this embodiment.

[Effect of device]

As described above, according to the present invention, the wind direction plate having a plurality of cut and raised pieces for partially changing the flow of the air blown from the propeller fan along the one side surface in the wind tunnel is provided, and Since the hole communicating with the installation space of the fuel injection nozzle is provided on the bottom surface of the wind tunnel on the propeller fan side, the pressure difference between the combustion cylinder pressure and the fuel injection nozzle becomes large, and the primary air is supplied in the pushing direction. There is an effect that primary air can be sufficiently supplied without increasing the jetting power of fuel gas, quiet and stable burning of blue fire can be obtained, and a safe and comfortable warm air heater can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a wind tunnel portion according to an embodiment of the present invention,
FIG. 2 is a perspective view showing a state before the wind direction plate is incorporated, and FIG.
The figure is a cross-sectional view of a conventional warm air heater, and Fig. 4 is the diagram of Fig. 3.
Fig. 5 is a cross-sectional view taken along line IV-IV, and Fig. 5 is a perspective view showing a conventional wind tunnel with a part thereof cut away. In the figure, 9 is a fuel injection nozzle, 11 is a burner, 13 is a combustion cylinder, 13a is a combustion gas outlet, 14 is a wind tunnel, 17 is a propeller fan, 18 is a wind direction plate, and 18a, 18b, 18c are cut and raised pieces. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Toshikazu Terauchi 800 Iwamatsu, Oshima-cho, Nitta-gun, Gunma Sanryo Electric Co., Ltd. Gunma Manufacturing Co., Ltd. (56) Bibliography 61-36248

Claims (1)

[Scope of utility model registration request] 1. A combustion cylinder provided so as to cover the periphery of the burner in a case where liquid fuel is vaporized and injected from a fuel injection nozzle, and primary air is taken from the surroundings by the injection output and burned by a burner. , A wind tunnel provided so as to cover the combustion cylinder, and a propeller fan that is installed on the rear surface of the wind tunnel and sends the combustion gas in the wind tunnel as warm air from the hot air outlet to the outside of the machine, An airflow plate having a plurality of cut and raised pieces for partially changing the flow of the air blown from the propeller fan downward along one side surface is provided, and the installation space for the fuel injection nozzle is provided on the bottom surface of the propeller fan side wind tunnel. A warm air heater characterized by having a hole communicating with the.