JPS6152516A - Burner for combustion apparatus - Google Patents

Abstract

PURPOSE:To shorten the length of a direction in which a fuel gas is injected through a nozzle thereby to minimise the installation space by installing a uniform pressure plate at a bent portion within a mixed gas passage formed in a side sectional shape in which a part of a mixed gas is folded and enlarged, and introducing the mixed gas into respective parts of a combustion plate under a uniform pressure. CONSTITUTION:A premixed gas consisting of a fuel gas injected into a throat porion 12a of a mixed gas passage 12 through a nozzle of an evaporation pipe and a primary air mixed therewith is guided upwardly from the tip end of the throat portion 12a. At the same time, a part of the premixed gas makes a U-turn and is guided up to the upper part of an inlet of the throat portion 12a of the upper part 12c. In this case, the premixed gas passes through a clearance formed between a hole 14a of a pressure balance plate 14 and the right-hand end wall of a communication port 12b of the mixed gas passage 12, and is guided by a guide vane 14b of the pressure balance plate 14 whereby only the just upper part of the communication port 12b does not assume a high tension and the premixed gas is guided to a combustion plate 11 via a smoothing plate 15. Since the length of the combustion plate 11 extends from the upper part of the inlet of the throat portion 12a to its tip end, the length of the fuel gas injection direction can be reduced to approximately 2/3 the conventional burner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a burner for forming a flame for a vaporized liquid fuel combustion device or a gas combustion device.

[Conventional technology]

A conventional burner as described above will be explained together with a vaporized liquid fuel combustion apparatus with reference to FIGS. 4 and 5.

In FIG. 4, 1 is a burner, 2 is a vaporizing pipe provided on the throat side of the burner 1, and a nozzle 3 is formed at the tip of the vaporizing pipe 2. Also.

A heater 4 is built into the vaporizing pipe 2, a fuel pump 6 is provided in a fuel supply pipe 5 communicating with the lower end of the vaporizing pipe 2, and the suction side of the fuel pump 6 is inserted into a fuel tank 7. A valve (not shown) inserted into the center of the vaporizing tube 2 is operated by a solenoid mechanism 8 to open and close the nozzle 3.

A return pipe 9 is connected to the end of the solenoid mechanism 8.

A return pipe 9 communicates between the solenoid mechanism 8 and the fuel tank 7. In addition, this is a temperature sensor installed on the top of the 10-ke vaporizer v2.

Next, the operation of this vaporized liquid fuel combustion device will be explained. When the temperature of the vaporizing tube 2 is raised by the heater 4, the temperature detector 10 detects this and issues a signal.

Operation of the fuel pump 6 is started. By operating the fuel pump 6, the fuel is sent from the fuel tank 7 to the vaporization pipe 2, where it is gasified in a short time, and the fuel tank is injected into the burner 1 from the nozzle 3 in the form of a high-speed jet stream. At this time, the fuel gas is mixed with an appropriate amount of primary air by the ejector action to form a premixture. The premixture is sent to the burner
It is ejected from the combustion plate at the upper end of the burner 1, and is ignited and burned by the ignition mechanism provided on the burner 1. A flame detector is provided above the burner 1, and the flame detector detects the combustion of the premixed mixture in the burner 1 based on the presence or absence of a flame, and extracts it as an electrical signal.

As shown in FIGS. 4 and 5, the burner of such a combustion device has a combustion plate 11 installed at the tip of an air-fuel mixture passage 12 in order to make the flame shape uniform.

It was formed symmetrically to the left and right in the figure with respect to the communication port 12b between the upper part 12c of the air-fuel mixture passage 12 and the throat portion 12a provided below.

[Problem that the invention seeks to solve]

However, the conventional burner as described above is
There was a problem in that the length in the left-right direction in the figure, that is, the direction in which the fuel gas is injected from the nozzle, was long and required a large installation space.

The purpose of this spacing is to solve the above-mentioned problems and provide a burner with a short length in the direction in which fuel gas is injected from the nozzle.

[Means for solving problems]

In the burner of the combustion device according to the present invention, a pressure equalizing plate is installed at a bend in a mixture passage formed in a side cross-sectional shape in which a part of the mixture is folded back and expanded.

It is designed to guide the air-fuel mixture to each part of the combustion plate at equal pressure.

[Effect]

In the burner of the present invention, by providing a pressure equalizing plate at the curved portion of the mixture passage, the mixture passage can be formed into a side cross-sectional shape in which a part of the mixture is folded back and widened.

The shape of the flame is made uniform in all parts, and the length in the direction in which fuel gas is injected from the nozzle can be made shorter than in the conventional type.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1 and 2 illustrate a burner for use in a vaporized liquid fuel combustion charge such as that shown in FIG. 4 and described above. This burner 1 has a throat portion 12 & formed at the bottom of a mixture passage 12 surrounded by side plates 13.13.

The throat portion 121L has a circular cross section, and its diameter gradually increases at the tip end, and extends to the left in FIG. The air-fuel mixture passage 12 extends from the tip of the throat portion 12a located at the left end in FIG. 1 so that a portion of the air-fuel mixture makes a U-turn.
The entrance is folded back and expanded to the right side in Figure 1, and the 5th
The upper part 12c is formed in a side cross-sectional shape with the left half of the burner shown in the figure removed.

The right end of the upper portion 125 is located approximately above the throat portion 12a. A pressure equalizing plate 14 is disposed within the communication port 12b that forms the bend between the throat portion 12& and the upper portion 12c. The pressure equalizing plate 14 is inclined so that its left end is in contact with the left end wall surface of the mixture passage 12 and its right end is located upward, so that a gap is created between the right end and the right end surface of the curved part of the mixture passage 12. has been formed.

In addition, as shown in FIG. 3, a part of the pressure equalizing plate 14 has a plurality of holes 14 a arranged in parallel in the left-right direction, and a guide vane 14 b that curves in a concave arc shape on the right side and protrudes upward. They are each formed by cutting and raising pressure equalizing plate material. A rectifying plate 15 is arranged above the pressure equalizing plate 14.

A combustion plate 11 made of heat-resistant mesh or the like is installed at the upper end of the burner 1 above the rectifying plate 15.

The pressure equalizing plate 14 - the rectifying plate 15 and the row baking plate 11 are the side plates 1
It is clamped at 3°13 and tightly fixed to these.

Next, the operation of this embodiment will be explained. In this burner 1, a premixture consisting of the fuel gas injected from the nozzle of the vaporizing pipe into the mixture passage 12 and the throat section 12A and the primary air mixed therewith is guided upward from the tip of the throat section 12&. .

A part of the premixture makes a U-turn and is guided to the throat part 12 & upper part of the upper part 12e. In this case.

The premixture is passed through the hole 14A of the pressure equalization plate 14 and the pressure equalization plate 14.
and the right end wall of the communication port 12b of the mixture passage 12.

By being guided by the guide vanes 14b of the pressure equalizing plate 14, the pressure does not become high only directly above the communication port 12b, and the pressure is guided to the combustion plate 11 via the rectifying plate 15 with equal pressure at each part. Therefore, the length of the flame formed on the combustion plate 11 is uniformly distributed in each part.

The burner of this embodiment has a throat portion 12a.
Since the length of the combustion plate 11 is from the top of the population part to its tip, the length of the burner in the left-right direction, that is, in the fuel gas injection direction, should be about 2/3 of that of the conventional one shown in FIG. Can be done.

In addition, in conventional burners, the primary air for combustion flows at the entrance of the throat section, so it is easy to cool down, and when the liquid fuel is gasified, there is a high rate of condensation, but in this example, the combustion Since the plate 11 is provided close to the throat portion 12a, heat is transferred from the combustion plate 11 to the inlet of the throat portion 12a, making it difficult for the fuel gas to condense.

This has the advantage of reducing odor generation.

Furthermore, this embodiment has less burner pressure loss and is advantageous in setting the primary air ratio.

Note that a rectifying plate 15 provided above the pressure equalizing plate 14 rectifies the air-fuel mixture to reduce combustion noise.

In this embodiment, three guide vanes were provided on the pressure equalizing plate, but in this invention, the guide vanes on the pressure equalizing plate may be omitted and the holes may be simply formed with a distribution according to the density of the streamlines of the air-fuel mixture. A small hole may be formed in the part of the pressure plate where the flow angle is flat, and a large hole may be formed in a part where the flow direction is small.

Furthermore, the present invention is not limited to vaporized liquid fuel combustion devices, but can also be applied to combustion devices that inject fuel gas into a burner at high speed, suck in surrounding air, and burn it as a mixture.

〔Effect of the invention〕

As explained above, according to the burner of the present invention, the mixture passage has a side cross-sectional shape in which a part of the mixture is folded back and expanded, such as in a U-turn, so that the total length of the burner is approximately 2/2 that of the conventional one. It can be shortened to 3, requires less installation space, and is combustible.

This is advantageous in terms of the structure of the device, and since the pressure equalizing plate is provided at the bend of the mixture passage, it is possible to obtain a uniform flame distribution in each part of the combustion plate.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a burner according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line ■--■ in FIG. FIG. 3 is a perspective view of a pressure equalizing plate, and FIG. 4 is an explanatory diagram of the configuration of a vaporized liquid fuel combustion apparatus having a conventional fuel tanker. FIG. 5 is a side sectional view of a conventional burner. 1... Burner + 11... Combustion plate, 12... Mixture passage. 14... Pressure equalization plate, 14a... Hole, 14b... Guide vane. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa (2 others) -9:

Claims (2)

[Claims] (1) In a burner of a combustion device that injects fuel gas at high speed, sucks in the surrounding primary air, and burns it as a mixture,
A mixture passage is formed with a side cross-sectional shape in which a part of the mixture is folded back and widened, a pressure equalizing plate is installed at the curved part of this mixture passage, and a pressure equalizing plate is installed at the tip of the mixture passage. A burner for a combustion device characterized by introducing an air-fuel mixture to each part at equal pressure. (2) The burner for the combustion device according to claim 1, wherein the pressure equalizing plate is provided with guide vanes that protrude around the hole toward the side where the air-fuel mixture is folded back.