JPS6113126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a two-piece flame receptacle in which an inner flame cylinder, an outer flame cylinder with a red-hot cylinder as a red-hot part connected to the upper part, and an outer cylinder with a heat-resistant glass etc. installed on the outer circumferential side are arranged concentrically. This relates to an air combustion type combustor, and its purpose is to provide a combustor that can achieve stable combustion by solving the ignition problem caused by heavy gases such as LPG.

In conventional combustors, when using a gas with a heavy specific gravity such as LPG, gas leaks downward through small gaps or holes until a sufficient draft is created after the gas tank is opened and the mixture is ignited. arise,
There was a risk that this leaked gas would ignite the ignition pilot flame and the flame inside the combustor, causing explosive combustion at the bottom of the combustor. Furthermore, the gas that leaked from the holes in the inner and outer flame tubes was also ignited, causing fires to blow out several times inside the inner flame tube and outside of the outer flame tube, where they were not supposed to burn. Furthermore, the gas that has started to burn usually creates a draft that pulls the gas below upwards, but in the early stages of combustion, the draft is weak and it is difficult for the force to reach the bottom of the inner and outer flame tubes. Therefore, in order to provide a draft quickly, it has been desired to ignite quickly and to generate a sufficient draft quickly. The gas flow generally follows the flame 12 in Figure 3.
As shown in , it forms a very thin shape at the bottom. This indicates that there is less gas supplied below the red-hot section 5, which was one of the reasons why the draft effect was poor in the past.

The present invention aims to prevent explosive ignition caused by gas leaks as described above, and is designed to provide reliable and quick ignition and sufficient draft. Its configuration will be explained.

In FIG. 1, numeral 1 includes a nozzle 2 for regulating the amount of combustion by a burner and a plurality of ejection ports 3 for ejecting gas uniformly. Reference numeral 4 denotes an inner flame tube, which has combustion air holes 4' in the upper part and many premixing air holes 4'' in the lower part. 5 indicates a red-hot part, which has combustion air holes 5'. In the example, it is connected to an outer flame tube 6 which is made separately as a glowing tube and has a premixed air hole 6', forming a so-called outer flame tube. A flow regulating body 7 is provided adjacent to the upper outer periphery of the outer flame tube 6 to regulate the flow of gas and air. Reference numeral 8 denotes a heat shield cylinder on which a heat-resistant and heat-transparent material 9 is placed, forming a so-called outer cylinder.

The above-mentioned inner flame tube, outer flame tube and outer tube are fixed concentrically with cross pins 10 and 10' and placed on the burner 1. Reference numeral 11 denotes a pilot burner which serves as an ignition source. In this embodiment, it is inserted between the outer flame cylinders and its tip is exposed to the upper surface of the flow regulating body 7, and ignites between the lower part of the incandescent cylinder and the flow regulating body. Form a flame for use. Regarding this ignition, the flame may be guided from below, or the flame may be directly ignited by discharge.
Also, the red-hot part may be formed of wire mesh, lath, or a perforated plate, and the red-hot part may be connected to the upper part of the outer flame cylinder having many pores, or the red-hot part and the outer flame cylinder may be formed integrally with an outer perforated plate. good.

Since the present invention has the above configuration, LPG
When such gas is supplied, the gas is ejected from the ejection port 3, mixed with air, and ejected from the pores 5' and 5''.
The pilot burner 11 ignites and burns it, heating the red-hot cylinder to red-hot. Since the flow regulating body 7 is provided as shown in FIG. 2, a local thick gas flow occurs below the red-hot part 5. This is because, in addition to the negative pressure effect caused by the flow regulator 7, the balance between the air pressure from the inner flame cylinder side and the air pressure from the outer cylinder side is shifted toward the outer cylinder side due to the narrowing of the passage on the outer cylinder side. . That is, since a thick layer of gas is formed on the flow period structure 7, ignition by the ignition source is quick, and the flow regulating body also acts as a flame stabilizer, so that the fire spreads to the entire circumference very quickly. Since the amount of gas in the ignition part is large, once ignited, a stable flame 12' is formed in this part, which heats the red-hot part 5 and also stabilizes the flame 12 formed in the red-hot part. In addition, there is a flame-holding effect by the flow regulator 7, and the draft stabilization time is very short, and in experiments, sufficient draft was generated before the amount of gas leaked to the point where it settled downward and ignited. It is highly safe and effective. Incidentally, the outer flame cylinder 6 and the red-hot part 5 may be constructed integrally.

In the present invention, by providing a flow regulating body as described above, the flame stability at the time of ignition in the red-hot dispersion area is increased, so that a stable draft can be obtained as soon as possible in the combustion section. The flame stabilization was very good.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the combustor of the present invention, Fig. 2 is a sectional view of the main part showing the state of flame, and Fig. 3
The figure is a sectional view of main parts showing a conventional example. 1... Burner, 4... Inner flame tube, 4', 4''... Air hole, 5... Red hot part, 5', 5''... Air hole, 6...
Outer flame tube, 7...flow regulator, 9...thermally permeable material, 11... ignition source.

Claims (1)

[Claims] 1. An inner flame cylinder with many air holes, an outer flame cylinder with many air holes with a red-hot part made of wire mesh, lath, perforated plate, etc. connected at the top, and an outer flame cylinder with a heat-resistant, heat-permeable material placed on it. and a cylinder are arranged concentrically, a tapered part is formed in the upper part of the outer flame cylinder so that the diameter of the red-hot part is smaller than that of the outer flame cylinder, and a hole is provided in this tapered part,
A combustor characterized in that a flow regulating body is provided below the tapered portion to generate a negative pressure in the tapered portion, and an ignition source is disposed on the upper surface of the flow regulating body.