JPH04309705A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To prevent intermittent occurrence of gasification sound under a weak combustion of liquid fuel or pulsation of combustion flame by a method wherein a double structure having a thermal insulation layer is formed at a connection part with a gasification chamber in an oil feeding pipe and a projecting part extending into the gasification chamber in the oil feeding pipe is formed with a storing part for the liquid fuel. CONSTITUTION:Liquid fuel is continuously fed from an oil feeding pipe 5 into a gasification chamber 2 and gasified by heat transmitted through a gasification device. In the aforesaid arrangement, an air layer 5c is formed between an outer pipe 5a and an inner pipe 5b in an oil feeding pipe 5. An upper end of the outer pipe 5a is projected up to a central part of the gasification chamber 2 and a gasification member 31 is abutted against an outer diameter part of the projecting part. In addition, the outer pipe 5a is constructed such that its inner diameter at its upper end is expanded from a position where the inner pipe 5b is fixed and a storing part 32 is formed. In turn, an oil feeding pipe 14 is connected to a lower part of the oil feeding pipe 5. The inner pipe 5b is thermally insulated with the air layer 5c to prevent fuel from being gasified within the oil feeding pipe 5 and at the same time pulsation of combustion flame is prevented at the storing part 32.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to liquid fuel combustion devices, and more particularly to improvements in vaporizers.

0002

2. Description of the Related Art FIG. 4 is a sectional view showing the structure of a liquid fuel combustion apparatus. In the figure, 1 is a vaporizer, 2 is a vaporization chamber, 3 is a throat, 4 is a preheater, 5 is a fuel supply pipe, and 6 is a A jet nozzle, 6a a nozzle hole, 7 a connecting pipe, 8 a needle pipe, 9 a needle, 10 a solenoid valve, 11 a valve mechanism, 1
2 is a thermistor for detecting the temperature of the vaporizer 1; 13 is an air intake hole for taking in primary air; 14 is an oil pipe; 15 is an electromagnetic pump; 16 is an oil pan; 17 is a cartridge tank;
18 is the fuel filler cap of the cartridge tank 17, 19
20 is a heat shield plate, 21 is a combustion tube, 22 is a carburetor cover that surrounds the carburetor 1, 23 is a packing, and 24 is a carburetor that supports the carburetor cover 22. 25 is a wind tunnel, 26 is a blower, 27 is a flame hole plate, 28 is a flame, arrow 29 is a combustion gas, and 30 is a casing.

Next, the operation will be explained. Turn on the operation switch (not shown), energize the preheater 4, and heat the vaporizer 1 to the temperature required to vaporize the liquid fuel.
Preheat. When preheating of the vaporizer 1 is completed, the thermistor 12 detects this and starts operation, and the electromagnetic pump 15
operates, liquid fuel is sent from the oil receiving tray 16 to the vaporization chamber 2 via the oil supply pipe 14 and the oil supply pipe 5, and is heated and vaporized in the vaporization chamber 2 to become vaporized gas. Then, 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 fuel gas is ejected from the nozzle hole 6a of the ejection nozzle 6.

[0004] The fuel gas ejected from the nozzle hole 6a is
Due to the ejector effect, a fixed amount of primary air determined by the nozzle hole diameter and throat diameter is sucked through the air intake hole 13 to form a mixed gas with a fixed primary air ratio. Then, the mixed gas is ejected into the combustion tube 21 from the flame hole provided in the flame hole plate 27, and is ignited by an appropriate ignition source (not shown) to form a flame 28, and the high temperature combustion gas 29 and Become. The high-temperature combustion gas 29 rises through the combustion tube 21, mixes with the cold air sent from the blower 26 when it exits the combustion tube 21, becomes warm air, passes through the wind tunnel 25, and exits from the hot air outlet (not shown). It is emitted forward and heats the room. The heating temperature is adjusted by controlling the operating frequency of the electromagnetic pump 15 and adjusting the supply of fuel to the vaporization chamber 2.

FIG. 5 is a sectional view of a main part showing the structure around the vaporization chamber 2 in a conventional liquid fuel combustion device.
The same reference numerals as in FIG. 4 indicate the same parts, and 31 is a vaporizing member. As shown in the figure, the liquid fuel is vaporized during the combustion operation by the vaporizing member 3 in the vaporizing chamber 2 due to the heat received from the vaporizer 1.
1, but if the operating frequency of the electromagnetic pump 15 is lowered in an attempt to lower the heating temperature during operation at a constant heating temperature, and the amount of fuel sent to the vaporization chamber 2 is reduced, the fuel in the vaporization chamber 2 is reduced. The heat removed for vaporization is reduced, and the vaporization chamber 2 becomes hotter than necessary, and this heat is transferred to the fuel supply pipe 5, so that some of the fuel is transferred to the vaporization chamber 2.
A phenomenon occurs in which the oil is vaporized in the oil supply pipe 5 before it reaches the oil supply pipe 5.

[0006] In order to solve such problems, the applicant of the present application filed a patent application on July 16, 1990 (Japanese Patent Application No. 2-1
No. 87596 "Liquid Fuel Combustion Apparatus" (hereinafter referred to as the earlier application), as shown in FIG. The invention discloses a structure in which an air layer 5c is provided between the vaporizing chamber 5a and the outer tube 5b, so that the heat of the vaporization chamber 2 is difficult to be transmitted to the inner tube 5a.

[0007]

[Problem to be solved by the invention] The problem to be solved is that even in the liquid fuel combustion device according to the earlier application, it is difficult to eliminate the unpleasant vaporization noise that occurs during weak combustion and to achieve stable combustion. The point is that it is difficult. In other words, during weak combustion, the operating frequency of the electromagnetic pump is lowered to intermittently supply fuel to the vaporization chamber, but with the structure of the previous application, the diameter of the inner pipe cannot be increased very much due to the structure, so the opening in the vaporization chamber is The problem was that fuel was intermittently spouted into the vaporization chamber, resulting in harsh vaporization noises and pulsating combustion flames during weak combustion. The present invention has been made to solve such problems, and an object of the present invention is to obtain a liquid fuel combustion device that can perform stable vaporization even during weak combustion.

[0008]

[Means for Solving the Problems] The liquid fuel combustion device according to the present invention has a fuel supply pipe having a double structure, and a storage portion for storing fuel is provided in a protrusion inside the vaporization chamber at the tip of the fuel supply pipe. The most important feature.

[0009]

[Function] In the liquid fuel combustion device of the present invention, the fuel supply pipe has a double structure to prevent vaporization in the fuel supply pipe, and the double structure allows for discontinuous injection of fuel within the vaporization chamber. This can be prevented in the storage section.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a main part showing the operating state of a liquid fuel combustion apparatus in an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part showing the structure around a vaporization chamber 2 in this embodiment. is a vaporizer, 2 is a vaporization chamber, 5 is a fuel pipe, 5a is an inner pipe of the fuel pipe 5, 5b is an outer pipe of the fuel pipe 5, 5c is an air layer between the outer pipe 5b and the inner pipe 5a, 14 31 is a vaporizing member, and 32 is a storage section provided at the tip of the oil supply pipe 5.

As shown in FIG. 2, the inner diameter of the outer tube 5b is widened in the middle, and an inner tube 5a is formed at the lower end where the inner diameter is smaller.
The lower end of is inserted and fixed. The upper end of the inner tube 5a is expanded into a flange shape, and the expanded flange end surface is closely fixed to the inner diameter of the outer tube 5b.
An air layer 5c is formed between the inner diameter of the inner tube 5a and the inner tube 5a. Further, the upper end of the outer tube 5b protrudes to approximately the center of the vaporization chamber 2, and the vaporization member 31 is in contact with the outer diameter of this protrusion. The inner diameter of the outer tube 5b is further widened at the upper end of the position where the inner tube 5a is tightly fixed, that is, at the tip of the protrusion, and the storage section 32 is formed there.

The oil supply pipe 5 in this embodiment has the above-described structure, and the oil supply pipe 14 is connected to the lower part thereof and connected to the electromagnetic pump 15. In addition, the joint between the fuel supply pipe 5 and the carburetor 1 is arranged so that the aluminum alloy with good thermal conductivity surrounding the vaporization chamber 2 does not come into close contact with the fuel supply pipe 5.
It has a structure with a cutout and a certain amount of space.

Next, the operation will be explained. As already mentioned, during weak combustion, the operating frequency of the electromagnetic pump 15 is kept low, so that the fuel is sent to the vaporization chamber 2 through the oil feed pipe 14 intermittently. As a result, the heat balance within the vaporization chamber 2 is disrupted, causing the vaporization chamber 2 to become hot.In the conventional device, the high heat from the vaporization chamber 2 is transmitted to the fuel supply pipe 5, and this heat causes the fuel to vaporize within the fuel supply pipe 5. However, in this embodiment, the inner pipe 5a is insulated by making the refueling pipe 5 have a double structure sandwiching the air layer 5c, and the phenomenon of combustion being vaporized within the refueling pipe 5 can be avoided. Preventing.

[0014] Furthermore, if the fuel supply pipe 5 has a double structure for heat insulation, the diameter of the pipe (inner pipe 5a in this embodiment) that feeds the fuel will inevitably become smaller, so that the fuel that is intermittently fed will be As shown in FIG. 6, a phenomenon occurs in which discontinuous injection occurs from the inner pipe 5a, and the injected fuel may reach the upper wall of the vaporization chamber 2, causing discontinuous vaporization noise and vaporization. The combustion flame is no longer stable and the combustion flame is no longer stable. Therefore, in this embodiment, by providing a storage section 32 at the tip of the fuel supply pipe 5, fuel is temporarily stored in this storage section 32, and a structure is adopted in which the pulsation is absorbed. By providing this storage section 32, even when fuel is intermittently fed during weak combustion, stable vaporization continues and prevents discontinuous vaporization noise and pulsation of the combustion flame. are doing.

In the above embodiment, the flange portion of the inner tube 5a is bent at right angles to provide a rectangular storage portion 32, but the storage portion may have any structure as long as it can prevent fuel injection.
For example, a tapered reservoir 33 as shown in FIG. 3 may be used.

[0016]

Effects of the Invention As explained above, the liquid fuel combustion device of the present invention has a double structure for the fuel supply pipe and a storage section at the upper end, thereby reducing the generation of intermittent vaporization noise during weak combustion and the combustion flame. This has the advantage of preventing pulsation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a structure around a vaporization chamber in an embodiment of the present invention.

FIG. 3 is a sectional view of a main part showing a structure around a vaporization chamber in another embodiment of the present invention.

FIG. 4 is a sectional view showing the configuration of a liquid fuel combustion device.

FIG. 5 is a cross-sectional view of main parts showing the structure around the vaporization chamber in a conventional device.

FIG. 6 is a sectional view of a main part showing the structure around the vaporization chamber in the device of the previous application.

[Explanation of symbols]

1. Vaporizer 2 Vaporization chamber 5 Oil supply pipe 5a Inner pipe 5b Outer tube 5c　Air layer 14 Oil pipe 31 Vaporization member 32, 33 Storage part

Claims (1)

[Claims] Claim 1: A liquid fuel combustion device in which liquid fuel is continuously fed into a vaporization chamber using a fuel supply pipe, and is vaporized into vaporized gas by heat transferred via a vaporizer in the vaporization chamber, wherein the fuel supply pipe is A liquid fuel combustion device characterized in that a connecting portion with the vaporization chamber has a double structure with a heat insulating layer, and a storage portion for storing liquid fuel is provided in a protrusion inside the vaporization chamber at the tip of the fuel supply pipe.