JPS6410729B2 - - Google Patents

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. Further, a heater 4 is built into the vaporization pipe 2, and a fuel pump 6 is connected to a fuel supply pipe 5 communicating with the lower end of the vaporization pipe 2.
The suction side of the fuel pump 6 is inserted into the fuel tank 7. A valve (not shown) inserted into the center of the vaporizing pipe 2 is operated by a solenoid mechanism 8 to open and close the nozzle 3, and a return pipe 9 is connected to the end of the solenoid mechanism 8. , solenoid mechanism 8 and fuel tank 7 with return pipe 9
are being communicated. Note that 10 is a temperature sensor installed at the top of the vaporizing tube 2.

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, and the operation of the fuel pump 6 is started. By operating the fuel pump 6, liquid 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 from the nozzle 3 into the burner 1 as a high-speed jet stream. At this time, the fuel gas is mixed with an appropriate amount of primary air by the effluent action to form a premixture. The premixed mixture is ejected from the combustion plate 11 at the upper end of the burner 1, and is ignited and burned by an 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 provided at the tip of the air-fuel mixture passage 12 in order to make the flame shape uniform.
However, the upper part 1 of the mixture passage 12 provided below this
2c and the throat portion 12a are formed symmetrically in the left and right directions in the figure with respect to the communication port 12b.

[Problem that the invention seeks to solve]

However, conventional burners such as those described above are
There was a problem in that the length in the left-right direction in FIG. 5, ie, the direction in which the fuel gas is injected from the nozzle, was long and required a large installation space.

An object of the present invention is to solve the above-mentioned problems and provide a burner that has a short length in the direction in which fuel gas is injected from the nozzle and has an excellent effect of dispersing the pressure of the air-fuel mixture.

[Means for solving problems]

The burner of the combustion device according to the present invention has a plurality of holes arranged in parallel in a bent part in the mixture passage formed in a side cross-sectional shape in which a part of the mixture is folded back and widened, and the mixture is formed around the holes. A pressure equalizing plate with guide vanes protruding upward on the folded side is installed to guide the air-fuel mixture to each part of the combustion plate at equal pressure.

[Effect]

In the burner of this invention, by providing a pressure equalizing plate at the curved part of the mixture passage, even if the mixture passage has a side cross-sectional shape in which part of the mixture is folded back and expanded, the flame shape is uniform in each part. This allows the length in the direction in which fuel gas is ejected from the nozzle to be shorter than that of conventional nozzles.

〔Example〕

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

1 and 2 show a burner for use in a vaporized liquid fuel combustion apparatus such as that shown in FIG. 4 and described above. This burner 1 has a throat part 12a formed at the lower part of the mixture passage 12 surrounded by side plates 13, 13, and the throat part 12a has a circular cross section and a gently expanding diameter at the tip end to the left side in FIG. It is extending. The air-fuel mixture passage 12 is connected to the first
Part of the air-fuel mixture flows from the tip located at the left end of the figure.
The throat portion 12a is folded back and expanded toward the entrance of the throat portion 12a, that is, the right side in FIG. It is arranged substantially above the entrance of the section 12a. A pressure equalizing plate 14 is disposed within a communication port 12b that forms a bend between the throat portion 12a 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. is formed. Further, as shown in FIG. 3, the pressure equalizing plate 14 has a plurality of holes 14a arranged in parallel in the left-right direction, and a guide blade 14b that curves in a concave arc shape on the right side and protrudes upward.
They are each formed by cutting and raising a pressure equalizing plate material on the left side of 4a. A rectifying plate 15 is arranged above the pressure equalizing plate 14, and a combustion plate 11 made of heat-resistant mesh is installed at the upper end of the burner 1 above the rectifying plate 15. The combustion plate 11 is sandwiched between the side plates 13, 13 and tightly fixed thereto.

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 vaporization pipe to the throat portion 12a of the mixture passage 12 and the primary air mixed therewith is guided upward from the tip of the throat portion 12a, and A part of the premixture makes a U-turn and reaches the upper part 12c.
is guided to the upper part of the entrance of the throat part 12a. In this case, the premixture is transferred to the hole 14a of the pressure equalizing plate 14 and the communication port 12b between the pressure equalizing plate 14 and the mixture passage 12.
Guide vane 1 of pressure equalizing plate 14 passes through the gap with the right end wall.
By being guided by 4b, high pressure does not occur only directly above the communication port 12b, and the current plate 15 maintains equal pressure in all parts.
It is guided to the combustion plate 11 through the. Therefore, the length of the flame formed on the combustion plate 11 is uniformly distributed in each part.

In the burner of this embodiment, the combustion plate 1 extends from above the inlet of the throat part 12a to the tip thereof.
1, the length of the burner in the left-right direction, that is, the fuel gas injection direction, can be reduced to about 2/3 of that of the conventional burner shown in FIG.

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 Board 11
is provided up to a position close to the inlet of the throat portion 12a, so that the combustion plate 11 is
Since heat is transferred to the inlet of the fuel gas, the fuel gas is less likely to condense, which has the advantage of reducing odor generation.

Furthermore, this embodiment has less pressure loss in the burner 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. The portions of the pressure plate with high streamline density may have small holes, and the portions with low streamline density may have large holes. 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. 3, which requires less installation space and is advantageous in terms of the configuration of the combustion device.In addition, multiple holes are provided in parallel at the bend of the mixture passage, and the area around each hole is A pressure equalizing plate with guide vanes protruding upward from the side where the mixture is folded back is installed, so the pressure of the mixture is easily dispersed by the multiple guide vanes, and a uniform flame distribution is achieved in each part of the combustion plate. effective.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing a burner according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line - - in Fig. 1, Fig. 3 is a perspective view of a pressure equalizing plate, and Fig. 4 shows a conventional burner. FIG. 5, which is an explanatory diagram of the configuration of a vaporized liquid fuel combustion apparatus, is a side sectional view of a conventional burner. 1... Burner, 11... Combustion plate, 12... Mixture passage, 14... Pressure equalization plate, 14a... Hole, 14
b...Guide blade. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a burner of a combustion device that injects fuel gas at high speed, sucks in surrounding primary air, and burns it as a mixture, a mixture passage is formed in a side cross-sectional shape in which a part of the mixture is folded back and expanded, A plurality of holes are arranged in parallel at the bend in the mixture passage, and a pressure equalizing plate having guide vanes protruding upward from the side where the mixture is folded back is installed around each hole. A burner for a combustion device, characterized in that the air-fuel mixture is guided at equal pressure to each part of a combustion plate provided at the tip of the burner.