JPS6237723B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a burner adapted for use in a torch gas-fed with a high gas flow path.

It is an object of the present invention to provide a burner for use in torches and the like that operates efficiently at high gas flow rates while producing a flame attached to the burner.

The other object of the present invention is to provide a gas inlet;
This is achieved by the burner of the invention, which comprises a gas outlet, an ignition chamber and an expansion chamber, and a nozzle arrangement. The nozzle device has a diffusion grille located intermediate the ignition chamber and the expansion chamber. The diffuser grille has a generally omega-shaped longitudinal section and a front edge and side sections. A plurality of openings are provided along the front edge and side surface of the grill. The side surface of the grill is spaced inwardly from the tapered outer wall of the burner to form a side passage between the side of the grill and the tapered outside of the burner, and is configured to increase the flow rate of gas flowing through this side passage. The combustion action of the gases passing through the front edge of the grill ignites the gases flowing out of the ignition chamber from the side passages and maintains the flame in close proximity to the burner.

The term "omega-shaped cross-section" used herein to define the longitudinal cross-section of a grill shall mean the shape represented by the Greek letter omega and shapes approximating this shape. .
Therefore, as explained below with reference to the accompanying figures, this omega shape extends from the rounded embodiment shown in FIG.
There are various shapes including the angular shape shown in FIG. 4 and 5 show the planar front edge 6. FIG. Furthermore, as shown in FIG. 5, the front edge of the grill may be disposed on the same plane as the side surface of the grill.

The cross section of the grill can be parallelogram or circular. Other shapes are also possible. The shape of the grill and the shape of the burner's tapered outer wall are
They are mutually aligned to form the desired passageway according to the present invention. That is, when operating with a tapered outer wall having a circular cross section, the correspondingly used grille also has a circular cross section. Also, when the tapered outer wall of the burner is parallelepiped, as shown for example in FIG. 1, the grille is coextensive with the burner outlet and therefore also has a parallelogram cross-section.

In a preferred embodiment of the invention, the openings of the diffusion grille have a total area at least equal to or greater than the total area of the gas burners.

The diffusion grill itself can consist of one or two perforated metal plates. It is also possible to use any suitable grill material other than metal. The number of perforated plates used depends on the flow rate and pressure of the gas used. When using multiple diffusion grills,
These grilles can overlap directly and completely on top of each other, or they can be offset from each other at their respective front edges. Furthermore, when using a plurality of diffusion grilles, each with an aperture or orifice, the total area of the apertures in the outer layer of metal or similar material forming the outer diffusion grille is preferably greater than the total area of the apertures in the inner diffusion grille. This prevents the flame from flowing back into the expansion chamber.

Still another feature of the invention is that the base of the diffuser grille includes an outwardly directed flange adapted to be received in a groove along the inner surface of the burner wall. The distance between the tapered wall of the burner and the side surface of the diffuser grille is therefore a function of the length of this flange and the depth of the groove.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

The burner which forms the object of the invention consists of two symmetrical halves which are fastened together to form a gas inlet and a gas outlet. The gas inlet is arranged and configured to be attached to a gas supply line. A diffusion grille is arranged intermediate the gas inlet and the gas outlet, acting as a nozzle device and delimiting the expansion chamber and the ignition chamber. The diffusion grille has an omega-shaped cross-section and is provided with orifices forming nozzle arrangements for the gas flow, which are distributed along its front edge and its side surfaces of triangular or circular longitudinal section. This grille side portion is offset from the burner inner wall surface and forms a gas flow passage. This gas flow passes through the cone of the ignition chamber to the outside of the ignition chamber. This ignition chamber cone increases the velocity of the lateral gas flow and the combustion gases in the ignition chamber of the gas stream passing through the leading edge of the grill, thus igniting the lateral gas flow outside the ignition chamber. This makes it possible to improve the adhesion of the flame.

The diffusion grill consists of one or two metal plates depending on the gas pressure used. The metal plate or plates are provided with a plurality of openings forming a nozzle arrangement. The total area of these openings is at least equal to or larger than the cross-sectional area of the gas outlet of the ignition chamber. When using low or medium pressure gas,
Two metal plates are used, either stacked on top of each other and bonded, or not bonded. To prevent flame backflow, the total cross-sectional area of the openings in the upper metal plate is larger than the total cross-sectional area of the openings in the lower metal plate.

As shown in FIGS. 1 to 5, the burner body 1 is
It consists of two halves symmetrically arranged and secured to each other by soldering or other known means.
This burner body 1 has an expanded tubular portion forming an expansion chamber and a tapered tubular portion forming an ignition chamber connected to each other. Terminal 4 is an adjustable cylindrical inlet attached to the supply line of a high flow gas line (not shown) and terminal 5 is an outlet. A diffusion grille 6 is disposed between the inlet port 4 and the outlet port 5, and this diffusion grille constitutes a nozzle device.
This diffusion grille is held so as to define the expansion chamber 7 and the ignition chamber 8. The diffusion grill 6 shown in FIG. 3, which can be used for low-pressure gas, has two metal perforated plates 9 and 10 stacked on top of each other, and along the front edge thereof,
It is constructed by having a space. The grille 6 has an omega-shaped cross section and its front edge 11 is circular or rounded. Metal perforated plates 9 and 10
is provided with a plurality of openings along its respective front edge 11 and side wall 12 forming a nozzle arrangement.
Upper perforated plate 9 to avoid flame return or backflow.
The total area of the openings is about 50% larger than the total area of the openings in the lower perforated plate 10. Lower metal porous plate 10
The total area of the openings is equal to or larger than the area of the outlet 5 of the ignition chamber 8 of the burner 1. Especially when operating with high pressure gas, the grill 6 can be in the form of a single metal perforated plate. However, when operating with medium pressure gas, it is possible to use two metal perforated plates stacked one on top of the other and bonded to each other.

The grille 6 is held inside the burner 1 by means of a flange portion 13 projecting from its side wall 12 which is inserted into a groove 14 in the halves 2 and 3. Groove 14
The position of the side wall 12 of the grill 6 relative to the interior of the burner 1 is determined by inserting the flange 13 therein, thus forming a gas flow passage 15 across the side wall 12. In this case, the spacing is determined such that only gas flow occurs and no gas combustion occurs. That is, by forming the extension 16 of the ignition chamber 8 in a conical shape so as to increase the velocity of the side gas flow, combustion only takes place outside the ignition chamber 8. Combustion of the gas flow across the front edge of the grill in the ignition chamber ignites the side gas flow flowing at high speed towards the outside of the ignition chamber 8 and improves flame adhesion.

Further, with the above configuration, the present invention allows the flame to be held in a position close to the burner in a state where it slightly enters the center area of the ignition chamber where the flame is ignited or maintained, while the flame is held in a position close to the burner through the lateral opening of the grill. The gases that flow out and are deflected by the outer walls of the ignition chamber are prevented from being ignited by said outer walls and the particular shape of the grille, and this non-combustible flow of gas acts as a kind of insulation layer to continuously cool the outer walls of the ignition chamber. However, the burner wall is not heated by the flame.

The invention is not limited to the embodiments described above, but extends to other embodiments. That is, the cross-sectional shapes of the expansion chamber 7 and the ignition chamber 8 can be made into various shapes, for example, rectangular, circular, oval, etc. The shape of the grille 6 with an omega cross section is
The shape of these chambers, in particular the shape of the ignition chamber 8, is matched.

While FIG. 1 shows a parallelogram-shaped outlet and a rounded omega-shaped diffusion grille extending longitudinally of this outlet, FIG. 2 shows that the tapered wall of the ignition chamber is conical; An embodiment is shown in which the cross section of the grill is circular.

FIG. 3 shows a two-layer grille of cross-sectional shape with a circular or rounded front edge.

FIG. 4 shows a grille with side surfaces sloping relative to the base, and FIG. 5 shows a grille with planar sides extending up to the flange 13.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a gas burner according to the invention with an outlet of rectangular cross section, FIG. 2 is a perspective view of another embodiment of the gas burner of the invention with an outlet of circular cross section, FIGS. 3 and 4. and FIG. 5 are burner longitudinal cross-sectional views showing cross-sections of various types of grills used in the burner of the present invention. 1...burner, 2, 3...half body, 4...gas inlet,
5...Gas exhaust port, 6...Grill, 7...Expansion chamber, 8...
Ignition chamber, 9, 10... Perforated plate, 11... Grill front edge, 12... Grill side surface, 13... Flange, 14
... groove, 15 ... side passage, 16 ... central flap.

Claims (1)

[Scope of Claims] 1. A cold nozzle gas burner for high-speed gas combustion producing an external flame, the gas burner having a gas inlet connected to a gas inlet suitable for high-speed mixing of air and flammable gas. A tubular body including a continuous opening, an expanding tubular part forming an expansion chamber, and a tapered tubular part forming an ignition chamber that flows out through a gas outlet to the outside, the expansion chamber and the ignition chamber. are separated in the joining region between the expanded tubular part and the tapered tubular part by a diffusion grille having a substantially omega-shaped longitudinal section and connected to the tubular body; A side passage having a recess aligned toward the gas inlet, having a cavity to prevent the spread of flame, and preventing heating of the tapered tubular portion is formed by the diffusion grille and the tapered tubular portion. A gas burner characterized in that it is formed in a straight line. 2. The gas burner according to claim 1, wherein the tapered tubular portion has two opposing walls that are concentrated toward each other. 3. The gas burner according to claim 1, wherein the diffusion grille is made of a metal porous portion at least partially in the shape of a semi-cylindrical cylinder, and is recessed toward the inside of the expansion chamber. 4. The gas burner according to claim 1, wherein the diffusion grill is formed by stacking metal porous plates of an inner layer and an outer layer. 5. Gas burner according to claim 1, characterized in that the tubular body consists of two halves arranged to hold a diffusion grille between them.