JP2865406B2 - Liquid fuel combustion device - Google Patents

Description

The present invention relates to a liquid fuel combustion apparatus that vaporizes liquid fuel such as kerosene and vaporizes and combusts this vaporized fuel with combustion air.

(B) Conventional technology A conventional liquid fuel combustion device of this type is disclosed in
As disclosed in Japanese Patent Application Laid-Open No. 60-147012, a burner head is provided at an opening of a vaporizing cylinder having one end opened, and an air nozzle for feeding combustion air into the vaporizing cylinder and a front end facing the vaporizing cylinder through the air nozzle. With a fuel nozzle
The liquid fuel ejected from the fuel nozzle is vaporized inside the vaporization cylinder, and the vaporized fuel and the combustion air sent from the air nozzle are premixed and vaporized and burned by a burner head.

(C) Problems to be Solved by the Invention By the way, in the above-mentioned conventional apparatus, the tip of the fuel nozzle facing the inside of the vaporizing cylinder is cut obliquely, and the fuel is blown from the cut end, so that the particles are removed. To make the vaporization state good. However, in recent years, it has been desired to increase the combustion width (especially the reduction of calories in weak combustion) and to reduce the odor during digestion. In this case, the fuel particles scattered from the tip of the fuel nozzle become large, causing a malfunction such as instantaneous incomplete combustion such as breathing combustion, or the fuel is deteriorated, and a droplet is formed on the lower surface of the tip of the fuel nozzle. There are problems such as accumulation and dropping of the droplets from time to time, causing a large amount of red fire and generating an offensive odor during digestion.

The present invention has been made in view of the above circumstances, and has as its object to perform good vaporization combustion even when low calorie and weak combustion are performed.

(D) Means for Solving the Problems According to the present invention, a vaporizing cylinder having one end opened, a burner head provided at an opening of the vaporizing cylinder, an air nozzle for feeding combustion air into the vaporizing cylinder, A fuel nozzle having a fuel nozzle having a tip facing the inside of a vaporization cylinder through an air nozzle, wherein the fuel nozzle has a tip portion crushed from two directions in the vertical direction to form a tip outlet having a horizontally elongated slit shape, and Notches are provided at substantially the center portions of the upper and lower edges of the horizontally elongated slit-shaped tip outlet.

(E) Operation As described above, since the tip of the fuel nozzle is crushed from two directions in the upper and lower directions, and the shape of the tip outlet is formed into a horizontally elongated slit, the ejection speed of the liquid fuel ejected from the fuel nozzle is stopped. Not only are the particles finer, they are also scattered at a wide angle in the horizontal direction, so the vaporization surface can be used over a wide range, and vaporization can be performed continuously. Good vaporization combustion can be performed without causing breathless combustion even with weak combustion. In addition, the fuel nozzle is provided with a notch at the approximate center of the upper and lower edges of the tip outlet, which has a horizontally elongated slit shape, so that the fuel stays in the fuel nozzle deeper than the notch due to its surface tension. Since the fuel at the ejection port portion ahead of the notch is blown off by the air entering from the notch, the oil drainage becomes very good, and the phenomenon that the liquid accumulates on the lower surface of the tip of the fuel nozzle does not occur, and the fuel is stable and good. It is possible to perform evaporative combustion.

(F) Embodiment One embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, (1) is a bottomed cylindrical vaporizing cylinder having an open upper end and a burner head (2) disposed in the opening, and the vaporizing cylinder (1) is a heater (such as a sheathed heater). Heat is applied by 3), and flame holes (2A) (2A) are formed on the side of the burner head (2). A throttle plate (4) is arranged in the upper part of the vaporizing cylinder (1), and a disk-shaped baffle plate (6) is provided immediately below a throttle port (5) of the throttle plate (4). ) Is provided. (7) is an air nozzle having one end connected to the side wall of the vaporizing cylinder (1), and the other end of the air nozzle (7) is connected to an air supply pipe (10) communicating with an air supply blower (9). The primary combustion air is fed into the vaporizing cylinder (1) by the air nozzle (7). (1
Reference numeral 1) denotes a burner case provided on the outer periphery of the vaporization cylinder (1). In the burner case (11), secondary air for combustion is supplied from a supply air blower (9) through a secondary air pipe (12). Supplied. (13) is a fuel nozzle whose tip faces the inside of the vaporizing cylinder (1) through the air nozzle (7),
The base end of the fuel nozzle (13) is connected to a fuel supply pipe (16) communicating with the fuel tank (15) via a fuel pump (14) such as an electromagnetic pump, and is pumped up by the fuel pump (14). The liquid fuel in the fuel tank (15) is vaporized into a cylinder (1)
It is made to squirt inside. And the fuel nozzle (13) is made of stainless steel cylindrical thin tube,
As shown in FIG. 3 to FIG.
Squeezing from the direction to form the shape of the tip outlet (17) into a horizontally elongated slit shape, and furthermore, a notch (18) ( 18).

In FIG. 1, (19) is a cartridge tank for replenishing the fuel tank (15) with fuel, (20) is an igniter such as a spark plug, and (21) is a frame rod or the like for detecting a flame (F). It is a flame detector.

In the above configuration, when the vaporizing cylinder (1) is heated by the heater (3) and reaches a predetermined temperature, the fuel pump (14) is driven to drive the liquid fuel from the fuel nozzle (13) into the vaporizing cylinder (1). The liquid fuel is ejected and supplied, and is contacted with the vaporizing surface of the vaporizing cylinder (1), vaporized and premixed with the fuel primary air supplied from the air nozzle (7), and the mixed gas is supplied to the burner head (2). It gushes from the flame hole (2A). The jetted gas mixture is ignited by the discharge spark of the igniter (20), and forms a blue flame (F) on the peripheral side of the burner head (2) and burns. On the other hand, the combustion secondary air supplied from the secondary air pipe (12) into the burner case (11) rises in the space between the burner case (11) and the carburetor (1), and the burner head (2). ) Is supplied to the flame (F) formed in the flame hole (2A). Further, this combustion device varies the amount of air blown by the air supply blower (9) and the amount of fuel ejected by the fuel pump (14) proportionally, thereby changing the combustion thermal power from high-calorie strong combustion to low-calorie weak combustion. It can be changed to combustion.

According to this embodiment, the shape of the tip outlet (17) of the fuel nozzle (13) whose tip faces the interior of the vaporizing cylinder (1) through the air nozzle (7) is formed in a horizontally elongated slit shape. The liquid fuel ejected from the outlet (17) has its ejection speed stopped by the action of the horizontally elongated slit-shaped outlet (17),
Not only the particles become very fine, but also, as shown in FIG. 2, they spread over a wide area inside the vaporization cylinder (1) and scatter, so that the vaporization surface can be efficiently used over a wide range,
The vaporization of the fuel is greatly promoted, and a good combustion state can be maintained while preventing instantaneous incomplete combustion such as breathing in low calorie weak combustion as well as strong combustion.

Further, in the present embodiment, the shape of the tip ejection port (17) of the fuel nozzle (13) is made into a horizontally elongated slit shape, and a notch ( 18) Since (18) is provided, as shown in FIG.
After the fuel is ejected every pulse by the fuel pump (14), the fuel stays in the fuel nozzle (13) deeper than the notch (18) due to its surface tension, and furthermore, the fuel nozzle (13) is located ahead of the notch (18). The fuel at the jet port (17) is blown off by the air entering through the notch (18), which greatly improves the oil clogging and prevents the liquid from accumulating on the lower surface of the tip of the fuel nozzle (13). Good vaporized combustion can be performed. In particular, at the time of fire extinguishing, droplets accumulated on the lower surface of the tip of the fuel nozzle (13) drop into the vaporizing cylinder (1), causing a vaporization delay, which causes a large amount of unburned gas to leak. There is no need to worry and the generation of odor can be suppressed.

(G) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

Since the fuel nozzle crushes its tip from two directions, the shape of the tip outlet is made into a horizontally elongated slit shape. Therefore, the liquid fuel ejected from the tip nozzle of the fuel nozzle not only has fine particles but also has a horizontal shape. Since the gas is scattered at a wide angle in the direction, the vaporized surface is utilized over a wide range, and vaporization is continuously performed. Therefore, good vaporization combustion can be performed without causing breathing combustion even in weak combustion with low calories as well as strong combustion.

The fuel nozzle has cutouts at the approximate center of the upper and lower rims of the tip outlet, which has a horizontally elongated slit shape, so oil drainage is very good, and the phenomenon that droplets collect on the lower surface of the tip of the fuel nozzle is reduced. This does not occur, combustion can be stabilized over a wide range, and generation of odor can be suppressed.

[Brief description of the drawings]

1 to 5 relate to one embodiment of the present invention. FIG. 1 is a sectional view of a liquid fuel combustion apparatus according to the present invention, and FIG. ,
FIG. 3 is a plan view of the tip of the fuel nozzle, FIG. 4 is a sectional view of the same, and FIG. 5 is a view of the tip of the fuel nozzle viewed from the left side. (1) ... vaporizing cylinder, (2) ... burner head, (7) ...
... air nozzle, (13) ... fuel nozzle, (17) ... tip jet, (18) ... notch.

Claims (1)

(57) [Claims] 1. A vaporizing cylinder having one end opened, a burner head provided at an opening of the vaporizing cylinder, an air nozzle for feeding combustion air into the vaporizing cylinder, and a tip inserted into the vaporizing cylinder through the air nozzle. In the liquid fuel combustion device provided with a fuel nozzle facing the fuel nozzle, the fuel nozzle is crushed at its tip from two upper and lower directions to form a tip outlet having a horizontally elongated slit shape. A liquid fuel combustion device characterized in that notches are provided at substantially the center portions of the upper and lower edges of the outlet.