JPH0464805A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To prevent leakage of gasified gas to the outside of an air intake hole by providing a first protrusion part formed in a surrounding manner on the tip of the outer peripheral part of an injection nozzle and a second protrusion part extending downward from the lower part of a gasifier and formed in a manner to surround the first protrusion part. CONSTITUTION:The periphery of a nozzle hole 6a is impeded by adhering tar 31, and the injection direction of fuel gas injected through the nozzle hole 6a is changed and the fuel gas is injected in a lateral direction. Since gasified gas leaking in a lateral direction is shielded by means of two protrusion parts of the one being a first protrusion part 6b and a second protrusion part 1a, the gasified gas is sucked as mixture gas in a throat 3 through an ejector effect. The mixture gas flows through a throat 3 and is injected in a normal state through a burner head 27 to form flame at a burner head 27. By molding the two protrusion part of the first and second protrusion parts 6b and 1a integrally with a gasifier 1, the protrusion parts 1a and 6b can be kept at a high temperature, gasified gas is prevented from being coagulated after collision of it with the protrusion parts 1a and 6b, and a risk of coagulated fuel being flied to the lower part of the gasifier 1 for ignition is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to improvements in liquid fuel combustion devices.

[Prior Art] Fig. 4 is a sectional view showing the configuration of a conventional liquid fuel combustion device, in which (1) is a vaporizer, (2) is a vaporization chamber, and (3) is a vaporizer.
is the throat, (4) is the preheater, (5) is the oil supply pipe, (
6) is a jet nozzle, (6a) is a nozzle hole of the middle jet nozzle (6), (7) is a connecting pipe connecting the vaporization chamber (2) and the jet nozzle (6), (8) is a needle pipe, <9 ) is the needle, (10) is the solenoid valve, (11) is the valve mechanism, (1
2) is a thermistor that detects the temperature of the vaporizer (1);
3) is the air intake hole that takes in the secondary air, (14) is the oil pipe, (15) is the oil supply pump, (16) is the oil pan, and
7) is a cartridge tank, (18) is a fuel filler cap of the cartridge tank (17), (19) is a base that opens the mouth of the fuel filler cap (18), (20) is a heat shield plate,
(21) is a combustion tube, (22) is a carburetor cover that surrounds the carburetor (1), (23) is a gasket, (24) is a carburetor mounting leg that supports the carburetor cover (22), (25) is the wind tunnel, (26) is the blower, (27) is the burner head, (2
8) is the flame, the arrow (29) is the combustion gas, and (30) is the casing.

Figure 5 shows the vaporizer (1) of the liquid fuel combustion device shown in Figure 4.
6 is a cross-sectional view showing the structure around the burner head (27) shown in FIG. 4. In each figure, the same reference numerals as in FIG. A metal mesh seam welded to the outer periphery of the head (27), (27b,) is the burner head cap, and the carburetor <1
) is attached to the burner head (27) and the burner end cap (
27b) are fixed.

Next, the operation will be explained. Operation switch (not shown)
is turned on, the preheater (4) is energized, and the vaporizer (1) is preheated to the temperature required to vaporize the liquid fuel. When preheating of the vaporizer (1) is completed, the thermistor (
12) detects this and starts operation, and the oil supply pump (
15) operates, liquid fuel is sent from the oil pan (16) to the vaporization chamber (2) via the oil feed pipe (14), and the liquid fuel is fed into the vaporization chamber (2).
In step 2), it is heated and vaporized to become a vaporized gas. When the vaporization chamber 2) is sufficiently filled with vaporized gas, the solenoid valve (10) is opened to shift to the original combustion operation, and the fuel gas is discharged from the nozzle hole (6a) of the injection nozzle (6). is ejected.

Due to the ejector effect, the fuel gas ejected from the nozzle hole (6a) is mixed with a constant amount of primary air determined by the nozzle hole diameter and throat diameter, which is sucked through the air intake hole (13) and has a constant primary air ratio. It becomes gas.

Then, the mixed gas is vaporized by the heat of the vaporizer (1) and becomes vaporized gas, which is ejected into the combustion tube (21) from the flame hole provided in the burner head (27), and is sent to an appropriate ignition source (not shown). ) to form a flame (28) and turn into high-temperature combustion gas (29).

The high-temperature combustion gas (29) rises through the combustion tube (21), and when it exits the combustion tube (21), it mixes with the cold air sent from the blower (26) to become warm air, which passes through the wind tunnel (25). The hot air is discharged forward from a hot air outlet (not shown), thereby heating the room.

[Problems to be Solved by the Invention] Since the conventional liquid fuel combustion device described above is configured as described above, it is difficult to use deteriorated liquid fuel such as kerosene that has been exposed to sunlight for a long period of time. If the fifth
As shown in Figure (B), tar (31) adheres around the nozzle hole (6a), and the direction of fuel gas jetting changes, causing a portion of the vaporized gas to flow out of the air intake hole (13). The parts may leak and cause a bad odor, or a flame 28) may form somewhere other than the burner head (27), and the combustion flame (32) may not be formed in the correct position, causing a red flame or incomplete combustion. There were problems such as combustion failure and combustion stoppage.

Furthermore, as shown in Fig. 6, since the burner head portion is constructed by joining the burner head (27) and burner head cap (27b), which are individually molded, vaporized gas does not flow out from the joint. This may cause a bad odor, and due to poor thermal conductivity of the joint, only a portion of the joint may become extremely hot, causing thermal deformation. Furthermore, there were other problems such as high costs due to the large number of parts and the time required to assemble them.

This invention was made to solve this problem, and it prevents vaporized gas from leaking out of the air intake hole even if the ejection direction of fuel gas changes due to tar adhesion, etc.
The object of the present invention is to obtain a liquid fuel combustion device that is durable and easy to assemble.

[Means for Solving the Problems] In the first invention of the present application, the liquid fuel combustion device according to the present invention includes a first encircling protrusion on the outer periphery of the tip of the jet nozzle, and a first protrusion in the lower part of the carburetor. The first one extends downward from the bottom.
In the second invention of the present application, the burner head is integrally molded with the cap part and the flange part from the same material by squeezing.

[Function] In the liquid fuel combustion device of the present invention, the first invention of the present application includes a first encircling protrusion on the outer periphery of the tip of the jet nozzle, and a first protrusion extending downward from the lower part of the carburetor. Since we decided to provide a second protrusion that surrounds the first protrusion, vaporized gas will not leak out of the air intake hole even if the direction of combustion gas ejection changes due to tar attached around the nozzle. In the second invention of the present application, the burner head is integrally molded with the cap part and the flange part from the same material by squeezing, so the burner head can be fixed to the carburetor with screws, and the burner head can be fixed to the carburetor with screws. It becomes possible to make the temperature distribution uniform.

[Example] An example of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the structure around the vaporizer of a liquid fuel combustion device showing an embodiment of the first invention of the present application.
The same reference numerals as in the figure indicate the same or corresponding parts, (1a) is a protrusion that is die-cast integrally with the carburetor (1) (this protrusion will be referred to as the second protrusion), (6b)
) is a protrusion (this protrusion will be referred to as a first protrusion) that is die-cast integrally with the outer circumference of the jet nozzle (6). As shown in FIG.
a) forms an enclosure extending downward from the bottom of the carburetor (1);
The structure is such that this protrusion (1a) surrounds a first protrusion (6b) provided on the outer periphery of the jet nozzle tip.

Next, the operation will be explained. For example, when degraded liquid fuel, such as kerosene that has been exposed to sunlight for a long period of time, is used for a long period of time, tar may adhere to the area around the nozzle hole (6a), and the attached tar may fall down or peel off. By doing this, the attached tar (3
1), the area around the nozzle hole (6a) is obstructed, and the nozzle hole (6a) is blocked.
The direction of the fuel gas ejected from 6a) may change and eject laterally.

In such cases, with conventional devices, the fuel gas spouted laterally would leak out of the air intake hole (13) as vaporized gas, causing a bad odor or red flame. In the embodiment of the invention of 1, the vaporized gas leaking in the lateral direction is
Since the gas is blocked by both the protrusion (6b) and the second protrusion (1a), it is drawn into the throat (3) as a mixed gas due to the ejector effect, and passes through the throat (3) to the burner. It can normally eject from the head (27) and form a flame in the burner head (27).

Furthermore, by integrally molding both the first protrusion (6b) and the second protrusion (1a) with the carburetor (1), each protrusion (la), ( 6b) can be kept at a high temperature and the vaporized gas flows through each protrusion (la).

(6b) and condensation can be prevented, and the risk of condensed fuel scattering to the lower part of the carburetor (1) and catching fire can be avoided.

In the above embodiment, each protrusion (la), (6b) is integrally molded with the vaporizer (]), and each protrusion (la), (6b) is integrally molded with the vaporizer (]).
b) is to be maintained at a high temperature during combustion, and each protrusion <la) and (6b) are formed and attached using a material with good thermal conductivity that allows the heat from the vaporizer (1) to be well transferred. However, the same effect as in the above embodiment can be obtained.

FIG. 2 is a diagram showing an embodiment of the second invention of the present application, FIG. 2(A) is a perspective view showing the structure of the burner head in this embodiment, and FIG. 2(B) is a sectional view thereof. In each figure, the same reference numerals as in FIGS. 4 and 6 indicate the same or corresponding parts, and (
40) is the burner head in this example, (40a)
(40b) is the cap part of the burner head (40), (40c) is the flange part of the burner head (40), (41) is the set screw, ( 42) does not show the screw hole provided in the carburetor (1).

As shown in Fig. 2, the burner head (
40) is the cap part (40b) and the flange part (40c)
and are integrally molded from the same material by squeezing, and are fixed to the screw holes (42) drilled in the vaporizer (1) with setscrews (41) and mounted on the vaporizer (1). .

Therefore, the joint part present in the conventional burner head (27) can be eliminated, the risk of vaporized gas flowing out from the joint part can be eliminated, and the temperature distribution can be made uniform.

Figure 3 is a diagram showing the temperature distribution of the burner head.
A) shows the temperature distribution at 900 Kcal/Hr, and Figure 3 (B) shows the temperature distribution at 2500 Kcal/Hr.
The temperature distribution in Hr is shown, and in each country =
9-1 10~ The solid line shows the temperature distribution of the integrally molded burner head (40) in this embodiment, and the dashed-dotted line shows the temperature distribution of the conventional burner head (27).

As shown in the figure, compared to the conventional burner head (27), the integrally molded burner head (40) has improved heat conduction efficiency, making it possible to maintain a relatively uniform temperature distribution state both front and rear and left and right. Moreover, the temperature of the high temperature section and the average temperature can be kept lower than that of the conventional burner head (27).

Also, when assembling the burner head (40), the flange part (40)
c) can be fixed with a set screw, and the work process such as casting the bolt (27c) into the carburetor (1>), which is required for the conventional burner head (27), can be omitted, and the number of parts can be saved without reducing the number of parts. can.

[Effects of the Invention] As explained above, in this invention, a protrusion is provided between the nozzle tip and the carburetor, and the burner head is integrally formed with the cap and flange, so that the vaporized gas during combustion is This has the advantage that a liquid fuel combustion device with good durability and ease of assembly can be provided at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the invention of the present invention cylinder 1, and FIG.
The figure shows an embodiment of the invention of the cylinder 2 of the present application, and FIG. 3 is a diagram showing the temperature distribution of the burner head in the invention of the cylinder 2 of the present application.
FIG. 4 is a sectional view showing the configuration of a conventional liquid fuel combustion device;
FIG. 5 is a sectional view showing the structure around the vaporizer in a conventional device, and FIG. 6 is a diagram not showing the structure of the burner head in the conventional device. In the figure, (1) is the vaporizer, (1a) is the second protrusion,
(6) is the ejection nozzle, (6b) is the first protrusion, (13
) is the air intake hole, (22) is the carburetor cover, (24) is the carburetor mounting leg, (27> is the burner head, (28) is the flame, (31) is the tar, (32) is the combustion flame, (40) is a burner head, (40a> is a metal mesh, (40b)
(40c) is a flange portion, (41) is a set screw, and (42) is a screw hole. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A jet nozzle is installed through an air intake hole provided at the bottom of the carburetor, and the fuel jetted from this jet nozzle is mixed with air by the ejector effect and vaporized by the heat from the carburetor. In a liquid fuel combustion device that sends fuel to a burner head provided at the top of the vaporizer and performs combustion in the burner head, a first protrusion formed in an encircling shape at the tip of the outer circumference of the jet nozzle, and a first protrusion at the bottom of the vaporizer are provided. A second protrusion is formed to extend downward from the lower part of the carburetor and surround the first protrusion.
A liquid fuel combustion device characterized by comprising a protruding portion. (2) A jet nozzle is installed through the air intake hole provided at the bottom of the carburetor, and the fuel jetted from this jet nozzle is mixed with air by the ejector effect and vaporized by the heat from the carburetor. A liquid fuel combustion device that sends liquid fuel to a burner head installed at the top of the vaporizer and burns it in the burner head, characterized by a burner head whose tip is drawn into a convex shape and whose cap is integrally formed. liquid fuel combustion equipment.