JPH04324005A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To obtain a liquid fuel combustion device which enables ejection noises of vaporized gas ejected from an ejection nozzle to be reduced. CONSTITUTION:A liquid fuel combustion device wherein liquid fuel is fed into a heated vaporizer 1 to be vaporized, the resultant vaporized gas is ejected into a throat tube 3 through an ejection nozzle 6 to be mixed with primary air by utilizing an ejector effect, and the mixed gas is ignited to be burnt. In this liquid fuel combustion device, axial grooves 3a are formed on the periphery of the inner wall of the throat tube 3. The mixed gas of the vaporized gas with the primary air is smoothened in the throat tube, and ejection noises at the ejection nozzle can be reduced.

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 noise prevention thereof.

0002

2. Description of the Related Art FIG. 3 is a cross-sectional structural diagram showing the main parts of a conventional liquid fuel combustion device. In the figure, 1 is a vaporizer;
2 is an annular vaporization chamber formed in the vaporizer 1; 3 is the vaporizer 1;
4 is a preheating heater, 5 is a throat pipe formed integrally with
6 is a fuel supply pipe for supplying liquid fuel to the vaporization chamber 2; 6 is an ejection nozzle having a nozzle hole 6a for ejecting vaporized gas; 7
1 is a connecting pipe that connects the vaporizing chamber 2 and the jet nozzle 6, 8 is a needle pipe, 9 is a needle that opens and closes the nozzle hole 6a, 10 is an electromagnetic solenoid that controls the needle 9, and 11 is connected to a fuel tank (not shown). Oil pipe, 1
2 is a thermistor that detects the temperature of the vaporizer 1; 13 is an air intake port for taking in primary air; 14 is a burner head;
5 is a primary flame, and 15a is a secondary flame.

Next, the operation of this device will be explained. First, turn on a switch (not shown), energize the preheating heater 4, and heat the vaporizer 1 to the temperature required to vaporize the liquid fuel.
Preheat. When the preheating of the vaporizer 1 is completed, the thermistor 12 detects this and the operation is started, and the liquid fuel is sent to the vaporization chamber 2 via the oil feed pipe 11, heated in the vaporization chamber 2, and becomes vaporized gas. When the vaporization chamber 2 is sufficiently filled with the vaporized gas, the electromagnetic solenoid 10 is activated, the needle 9 is sucked, the nozzle hole 6a is opened, and the vaporized gas, that is, the fuel gas is ejected from the jet nozzle 6. It is ejected into the throat pipe 3.

Due to the ejector effect, the fuel gas ejected from the ejection nozzle 6 has a constant primary air ratio due to the primary air sucked from the air intake port 13, which is determined by the hole diameter of the nozzle hole 6a and the throat diameter of the throat pipe 3. It becomes a mixed gas. Then, this mixed gas is ejected from the flame hole provided in the burner head 14 into the combustion tube (not shown),
It is ignited by an appropriate ignition source to form a primary flame 15 and further a secondary flame 15a, resulting in high-temperature combustion gas.

[0005]

However, in the conventional device, the nozzle hole 6a (diameter of about 0.56
1KHz to 3KHz due to the ejection of vaporized gas from
Despite the use of sound-absorbing material around the jet nozzle 6, the noise was large and there was a problem in terms of comfort. The present invention was made to solve this problem, and an object of the present invention is to obtain a liquid fuel combustion device in which noise caused by the jet nozzle is suppressed.

[0006]

[Means for Solving the Problems] This invention supplies liquid fuel to a heated vaporizer, vaporizes it, jets out the vaporized gas into a throat pipe, mixes it with primary air by the ejector effect, and ignites the liquid to burn it. In the fuel combustion device, a groove running in the axial direction of the throat pipe is formed on substantially the entire circumference of the inner wall of the throat pipe.

[0007]

In the liquid fuel combustion apparatus of the present invention, the grooves on the inner wall of the throat pipe act to rectify the mixed gas of vaporized gas and primary air, thereby reducing the jetting noise of the jetting nozzle.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional structural view of the vicinity of a throat pipe showing an embodiment of the present invention. The same reference numerals as those in FIG. 3 indicate the same or equivalent parts, and therefore the description will be omitted. The difference from FIG. 3 is that the throat tube 3 has a plurality of grooves running in the tube axis direction (vertical direction in the figure) over the entire circumference of the inner wall of the throat tube 3. FIG. 2 is a plan view of the top of the throat pipe 3 in FIG. 1. 3a is this groove, and each groove 3a has a depth and a width of about 0.5 mm to 1.0 mm.

The operation of the liquid fuel combustion device with this configuration is the same as the conventional one, but the groove 3a on the inner wall of the throat pipe 3 allows
The mixed gas of the vaporized gas from the jet nozzle 6 and the primary air from the air intake port 13 is rectified, and the jet noise at the jet nozzle 6 is reduced. It was found that the reduction effect was greater than that of using a sound absorbing material, and therefore, it was possible to improve the comfort when using a liquid fuel combustion device.

0010

[Effects of the Invention] As explained above, the present invention has grooves running in the axial direction of the throat pipe on almost the entire circumference of the inner wall of the throat pipe, so that the mixed gas of vaporized gas and primary air is rectified in the throat pipe. As a result, the injection noise of the jet nozzle has been reduced, making it possible to use the liquid fuel combustion device more comfortably.

[Brief explanation of drawings]

FIG. 1 is a sectional structural diagram of the vicinity of a throat pipe showing an embodiment of the present invention.

FIG. 2 is a plan view of the top of the throat tube of FIG. 1;

FIG. 3 is a cross-sectional structural diagram of the main part of a conventional liquid fuel combustion device.

[Explanation of symbols]

1. Vaporizer 2 Vaporization chamber 3 Throat pipe 3a Groove on inner wall of throat pipe 6 Spout nozzle 6a Nozzle hole

Claims (1)

[Claims] Claim 1. A liquid fuel combustion device in which liquid fuel is supplied to a heated vaporizer and vaporized, and the vaporized gas is ejected into a throat pipe, mixed with primary air by an ejector effect, and ignited for combustion. A liquid fuel combustion device characterized in that a groove running in the axial direction of the throat pipe is formed around the entire circumference of the wall.