JPH03195802A - Liquid-fuel combustion equipment - Google Patents

Abstract

PURPOSE:To prevent the heating of a diffuser, and to obtain excellent combustion even in a weak combustion region b installing a heat-insulating material inside the bottom of a vaporizing cylinder. CONSTITUTION:A combustion cylinder 1 is composed of bottomed cylindrical internal cylinder 2 and external cylinder 3, front end sections of which are bonded mutually, and a regenerator 4 is formed between the internal cylinder 2 and the external cylinder 3. A bowllike vaporizing cylinder 16 opened on the bottom wall 5 side of the combustion cylinder 1 is disposed at a nose section in the combustion cylinder 1, and a rotor 17 for atomizing fuel mounted to a motor shaft 14 and an igniter 18 face each other in the vaporizing cylinder 16. A ceramic system heat-insulating material 23 is set up inside the bottom 24 of the vaporizing cylinder 16, and functions to interrupt radiant heat to the rotor 17 from the bottom 24. Since radiant heat from the bottom 24 of the vaporizing cylinder 16 is interrupted by the heat-insulating material 23, the rotor 17 is difficult to be brought to a heated state even at the time of weak combustion in which there are small quantities of liquid fuel and primary air fed to the rotor 17, and excellent combustion is obtain even in weak combustion. Accordingly, the range of inflammability is extended on the weak combustion side in the liquid-fuel combustion equipment.

Description

[Detailed description of the invention] (a) Industrial application field This invention is used as a heat source for hot water boilers, water heaters, space heaters, etc., and vaporizes liquid fuel such as kerosene and mixes it with air in advance. This invention relates to a liquid fuel combustion device that generates and burns a mixed gas of fuel and air.

(Example) Conventional technology As described in Japanese Utility Model Publication No. 62-46969, the conventional technology for this type of liquid fuel combustion device is to form a gas chamber between the inner and outer walls of a cylindrical shape with a bottom, A vaporizing cylinder provided with a diffuser is provided at the central open end of the gas chamber, communicating with the gas chamber and with a secondary air supply interval between the gas chamber and the central open end; It is known that a blower tube is inserted between the chamber and the vaporizing tube, and the inner and outer walls are inserted into the blower tube.

<C> Problems to be Solved by the Invention In the liquid fuel combustion device described above, the vaporization tube rotates together with the diffuser, and in the same type of liquid fuel combustion device, the vaporization tube is not fixed inside the combustion tube. There are some. These vaporizer tubes are easily heated by the combustion flame, and the diffuser is easily heated by the radiant heat from the vaporizer tube. During weak combustion when there is little liquid fuel or primary air supplied, the cooling effect of this liquid fuel and primary air is small, so the bottom of the vaporization cylinder is easily heated to the point where it turns bright red, and the radiant heat from this vaporization cylinder causes the diffuser to tends to become overheated. When the diffuser becomes overheated, the liquid fuel is easily repelled, like when water drops are dropped on a superheated iron plate, and the liquid fuel remains in large particles without being atomized by the diffuser. Becomes repelled. For this reason, the liquid fuel is not atomized well, which has the drawback that the combustion device may suffer from poor combustion.

The present invention provides a liquid fuel combustion device in which the diffuser is unlikely to be heated to an overheated state.

(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a bottomed carburetor tube opened at the base side of the combustion tube, and a motor provided at a distance from the carburetor tube. A liquid fuel combustion device comprising a substantially truncated conical diffuser that is passed through the diffuser, and a fuel supply pipe that supplies liquid fuel to the surface of the diffuser, in which a heat insulating material is provided inside the bottom of the vaporizing cylinder. It is.

(*) Effect In the liquid fuel combustion device according to the present invention, when in use, the radiant heat from the bottom of the vaporizer cylinder to the diffuser is blocked by the heat insulating material provided inside the bottom, so that cooling to the diffuser is prevented. Even during weak combustion where the effect is small, the diffuser is unlikely to become overheated.

(f) Example Next, an embodiment of the present invention will be described with reference to the drawings.

In the figure, the combustion cylinder (1) has a bottomed cylindrical inner cylinder (2) and an outer cylinder whose tips are connected to each other. Consisting of 1li(3),
An air storage chamber (4) is formed between the inner cylinder (2) and the outer cylinder (3). Further, a large number of primary air holes (7) and secondary air holes (8) are provided at the peripheral edge of the bottom wall (5) and the upper part of the peripheral wall (6) of the inner cylinder (2), respectively, and the outer cylinder (3) An air supply port (10) is provided in the center of the bottom wall (9). A fan case (11) is installed on the bottom wall (9) of the outer cylinder (3).
are connected. This fan case (11) accommodates an air inlet (12) and a blower fan (13) that sucks combustion air from the air inlet (12), and connects the blower fan (13) to the motor shaft (14). The burner motor (15) is driven by a burner motor (15). A bowl-shaped vaporizer tube (16) that is open on the bottom wall (5> side) of the combustion tube (1) is disposed at the tip of the combustion tube (1).
A fuel atomizing rotor (diffuser) (17) attached to the motor shaft (14) and an ignition device (18) consisting of a spark plug are exposed inside the motor shaft (14). Also, the rotor (1
7), there is a fuel supply pipe (1) with a nozzle at its tip.
9), and a flame detector (20) made of a flame rod is provided near the secondary air hole (8) in the combustion tube (1). In addition, the opening end of the inner cylinder (2) is provided with a combustion cylinder (
1) A flame holding ring (21) is attached that deflects the flame toward the bottom wall side. (22) is a fixture for the vaporizer cylinder (16).

Further, (23) is a ceramic-based heat insulating material, for example, and this heat insulating material is provided inside the bottom (24) of the vaporization cylinder (16) to block radiant heat from the bottom (24) to the rotor (17). It has a very strong function. Furthermore, this insulation material (23
) is an insulating material, so it is difficult for the temperature to rise and it is difficult to emit radiant heat.

In the liquid fuel combustion apparatus configured in this way, a combustion flame is formed around the vaporization cylinder (16) during use. Since the combustion flame heats the vaporization tube (16), the temperature of the vaporization tube (16) increases, and radiant heat is released from the vaporization tube (16). This radiant heat is transferred to the rotor (17
), but the vaporizer cylinder (16)
Since the radiant heat from the bottom (24) of the rotor is blocked by the heat insulating material (23), the rotor (17) is less likely to be heated compared to the conventional rotor which receives radiant heat from the bottom (16). Further, the peripheral side portion of the vaporization tube (16>) where the heat insulating material (23) is not provided functions as a vaporization surface for the liquid fuel that has been atomized and diffused by the rotor (17).

In this way, the radiant heat from the bottom (24) of the vaporization cylinder (16) is blocked by the heat insulating material (23), so the rotor (17)
The rotor (17) is unlikely to become overheated even during weak combustion when there is little liquid fuel or primary air supplied to the combustion chamber. Combustion is obtained. For this reason,
In the liquid fuel combustion device according to the present invention, the combustion range expands to the weak combustion side, and this was also confirmed through experiments.

(g) Effects of the Invention As explained above, according to the present invention, since the bottom of the vaporizing cylinder is provided with a heat insulating material, the diffuser is hardly heated, and good combustion can be achieved even in the weak combustion region. It is possible to provide a liquid fuel combustion device with a wide combustion range on the weak combustion side.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of a liquid fuel combustion device according to the invention. (1)... Combustion tube, (16)... Vaporization tube, (1
7)...Rotor [diffuser], (23)...Insulating material, (24)...Bottom.

Claims (1)

[Claims] (1) A combustion tube, a bottomed vaporization tube installed coaxially with the combustion tube and opened on the base side of the combustion tube, and a fuel atomization tube facing the opening side of the vaporization tube. What is claimed is: 1. A liquid fuel combustion device comprising a diffuser, characterized in that a heat insulating material is provided inside the bottom of the vaporization cylinder.