JP2957743B2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion system in which one blast fan supplies three air, convection air, primary combustion air, and secondary combustion air.

[0002]

2. Description of the Related Art Combustion systems used for oil fan heaters are roughly classified into three types: a Bunsen system, a vaporization system, and a rotary atomization system. In the Bunsen method, only one blower fan for convection is required, but since it uses a solenoid to collect unburned gas during ignition and fire extinguishing, it is comparable to a case where an independent combustion fan is installed. Material costs were high, and the advantage of using only one blower fan was not fully utilized. In the case of the vaporizing type and the rotary atomizing type, it is usual to install a convection fan and a combustion fan, respectively.
This is because the convection fan need not have a high static pressure, but the combustion fan desirably has a high static pressure as much as possible.

[0003]

In order to eliminate complications of components and provide products at a lower price, convection air is blown by a single blower fan and primary air and secondary air are burned to a combustion device. The purpose of this is to also use the blast for air. However, in such a case, the selection of the static pressure-air volume characteristics of the blower fan is restricted, and the static pressure becomes almost half or less as compared with the conventional burner fan. When the convective air flow and the combustion air flow in the combustion device interfere with each other, and the static pressure is reduced, it becomes more difficult to achieve good combustion.

[0004] In order to prevent the convection and combustion air flows from interfering with each other, a premixing / vaporization method with a burner head turned sideways may be used. In view of the above, the present invention provides a liquid fuel combustion apparatus that can promote the mixing of fuel and perform good combustion even if the static pressure of the combustion air cannot be increased in such a lateral premixing / vaporization method. It is intended to be.

[0005]

In order to achieve the above object, the present invention provides a bottomed cylindrical vaporizer having one open end and the other end closed, and a burner attached to the opening of the vaporizer. A liquid fuel combustion device having a burner head in a lateral direction, provided on a peripheral side wall of a carburetor,
An air supply device having first and second air supply ports for discharging air so as to form a vortex along a peripheral side wall of the vaporizer, and introduced into the vaporizer through the first air supply port;
A fuel supply device for causing fuel to flow toward the bottom wall of the vaporizer.

The above-mentioned object can be achieved even if the second air supply port is provided on the bottom wall of the vaporizer and allows the air to flow toward the opening of the vaporizer.

[0007]

[Operation] Although the primary fuel air from the first and second air supply ports is swirled in the vaporizer, it is possible to avoid the pressure loss that would otherwise be caused by swirling. The fuel flows down along the bottom wall of the vertical carburetor. At this time, the surface area is increased and the liquid thickness is reduced. Of mixed gas.

[0008]

In the embodiment shown in FIGS. 1 and 2, a blower 2 is provided in an upper portion of an outer case 1, a combustion device 3 is provided in a lower portion, and fuel is placed on a table 4 on which the outer case 1 is placed. An oil pan 6 of the supply device 5 is provided. In FIG. 1, 2a is Juan,
2b is a motor for fan, 7 is a fuel pump mounted on the oil pan 6, 8 is a fuel pipe connecting the fuel pump 7 and the combustion device 3, and 10 is a fan casing.

In FIG. 2, an air suction port 9 is formed in the upper part of the rear surface of the outer case 1, and a filter is detachably mounted on the air suction port 9. The fan casing 10 of the blower 2 has a downward outlet. The air is divided into a convection air b and a combustion air b by a separation plate 11 provided in the outlet. When the fan 2a is rotated by the drive of the fan motor 2b, most of the air sucked from the air suction port 9 becomes convection air A, passes through the downwardly directed outlet of the fan casing 10 and outside the combustion chamber 12, where the heat is generated. The heated and exchanged product is sent out from the hot air outlet 13 into the room. On the other hand, the combustion air blows into the intake pipe 16 of the combustion device 3 described below through the ventilation plate 14 formed by the trapezoidal ventilation plate 14 and the back surface of the outer case 1. Will be.

As shown in FIGS. 3 and 4, the combustion device 3
As in the case of a normal evaporative combustion apparatus, the evaporator includes a bottomed cylindrical evaporator 17 having one end opened and the other end closed, and a burner head 18 attached to the opening of the evaporator 17. FIG.
In FIG. 4, which is cut and developed along the line AA ′ of FIG. 4, the burner head 18 is shown as facing upward, but in fact, the vaporizer 17 is installed horizontally so that the bottom surface is almost vertical (see FIG. 1). .

An air supply device 19 for the carburetor 17 is provided around the outside of the carburetor 17 and has a flow passage 21 formed by a case 20 communicating with the intake pipe 16 described above. Vaporizer 1 to communicate
7 comprises a first air supply port 22 and a second air supply port 23 provided on the peripheral side wall. When the air supply ports 22 and 23 each having a slightly narrowed end are provided in a tangential direction with respect to the peripheral side wall of the carburetor 17, a vortex can be formed along the peripheral side wall of the carburetor 17 shown in the drawing. The secondary air for combustion is in the flow passage 2
A plurality of through holes 24 are formed in one upper surface, and a part of the combustion air in the flow passage 21 is caused to flow out from each through hole 24.

A fuel pipe 8 constituting the fuel supply device 5 is introduced into the carburetor 17 through a first air supply port 22, and a fuel nozzle 25 is attached to a tip of the fuel pipe 8. The fuel flows out from the fuel nozzle 25 toward the vertical bottom wall of the carburetor 17, as indicated by the arrow B in FIG. 26 is a heater mounted on the vaporizer 17.

The vortex of the primary combustion air in the carburetor 17 can be obtained in another embodiment shown in FIG. The example of FIG. 5 is different from the fuel pipe 8 of the fuel supply device 5 in that a first air supply port 22 for allowing air to flow out along the peripheral side wall of the vaporizer 17 is provided on the peripheral side wall of the vaporizer 17.
Is introduced into the carburetor 17 through the first air supply port 22, and a fuel nozzle 25 is attached to the tip of the fuel pipe 8, and the fuel from the fuel nozzle 25 is directed to the vertical bottom wall of the carburetor 17. There is no difference from the case of FIG. However, the second air supply port 23a is provided on the guide cylinder 2 protruding from the bottom wall of the vaporizer 17.
7 in that air is allowed to flow out toward the opening of the vaporizer 17.

[0014] By slightly deflecting the blow-off flow from the first air supply port 19 with respect to the peripheral surface of the guide cylinder 27, the primary combustion air becomes spiral, and the combustion primary air flows from the second air supply port 23a. A vortex similar to that of FIG. 4 is formed in cooperation with the air flow. The fuel that has flowed out toward the bottom wall of the vaporizer 17 does not flow out to the outside by the guide cylinder 27.

In any of the embodiments, the fuel that has hit the bottom wall of the vertical vaporizer 17 has an increased surface area and a thinner liquid thickness while flowing down by its own weight, and the primary air for combustion in the vaporizer 17 is reduced. In combination with the vortex, good combustion can be obtained.

[0016]

According to the present invention having the above-described structure, when one blast fan is used for both convection and combustion air, the static pressure of the combustion air cannot be sufficiently obtained and the primary combustion air in the vaporization chamber is not obtained. Even in the case where the air introduction speed cannot be made large, it is possible to form a vortex by introducing the fuel primary air from the first and second air supply ports. Also, since the bottom wall of the horizontal carburetor is vertical, it is possible to increase the fuel surface area and reduce the liquid thickness while spraying the fuel on the vertical carburetor bottom wall by its own weight. Combined with the vortex flow in the vaporization chamber, the premixing and vaporization of the fuel is carried out well even if the vaporizer is of a horizontal type, so that a uniform flame can be formed during combustion.

[Brief description of the drawings]

FIG. 1 is a schematic view of a liquid fuel combustion apparatus according to the present invention, with the entire panel removed and viewed from the front;

FIG. 2 is a schematic view of the liquid fuel combustion device of FIG. 1 as viewed from the side;

FIG. 3 is a cross-sectional view showing details of the air guide device of FIG. 1;

FIG. 4 is a sectional view taken along line AA ′ of FIG. 3 and developed.

FIG. 5 is a cross-sectional view corresponding to FIG. 4 showing another embodiment.

[Explanation of symbols]

 Reference Signs List 8: fuel supply device, 17: vaporizer, 18: burner head, 19: air supply device, 22: first air supply port, 23, 23a: second air supply port, 25: fuel nozzle.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23D 11/10 F23D 11/40

Claims (2)

(57) [Claims] 1. A liquid fuel combustion apparatus comprising: a bottomed cylindrical carburetor having one end opened and the other end closed; and a burner head attached to an opening of the carburetor, wherein the burner head is oriented sideways. , An air supply device provided on a peripheral side wall of the vaporizer and having first and second air supply ports for discharging air so as to form a vortex along the peripheral side wall of the vaporizer, and the first air supply port A fuel supply device that is introduced into the carburetor through the fuel cell and causes the fuel to flow toward the bottom wall of the carburetor. 2. A liquid fuel combustion device comprising: a bottomed cylindrical carburetor having one end opened and the other end closed; and a burner head attached to the opening of the carburetor, wherein the burner head is oriented sideways. And a first air supply port provided on the peripheral side wall of the vaporizer and allowing air to flow out along the peripheral side wall of the vaporizer, and introduced into the vaporizer through the first air supply port, and A fuel supply device for discharging fuel toward the bottom wall, and a second air supply port provided on the bottom wall of the vaporizer for discharging air toward the opening of the vaporizer are provided. Liquid fuel combustion device.