US2567485A

US2567485A - Gas-burner head with high-pressure air jets

Info

Publication number: US2567485A
Application number: US20132A
Authority: US
Inventors: Jenny Rudolf
Original assignee: MEYERHOFER GmbH
Current assignee: MEYERHOFER GmbH
Priority date: 1948-04-09
Filing date: 1948-04-09
Publication date: 1951-09-11
Anticipated expiration: 1968-09-11

Description

Sept. 11, 1951 R. JENNY GAS BURNER HEAD'WITH HIGH-PRESSURE AIR JETS Filed April 9, 1948 Patented Sept. 11, 1951 I i AIR g Rudolf Jenny, Zurich, Switzerland, assig'nor to JET Meyerhofer G. m. b. H .,1Zurich,j Switzerland Application April 9, 1948, Serial No. 20,132

My present invention relates to a gas-burner in which the gas flows through a nozzle-shaped conduit, and the air flows into the gas streamunder a higher pressure than the gas-at the discharge opening of the said conduit through a plurality of bores provided in the conduit-wall.

The main requirements to be fulfilled by a gas-burner of the type indicated are: theexcess air, i. e. the secondary air which does not participate in the combustion process as does the primary air, shall be a minimum; the combustion has to be complete and has to take place in a minimum of space; and the range for regulating the rate of combustion shall be large,

In the case of burners of larger size known in the art, the said requirements only could be fulfilled by using premixing chambers or diaphragms. Burners including a premixing chamber are subject to explosions, while diaphragms bring about a substantial loss of pressure and an overheating of the burners.

In order to avoid such deficiencies and drawbacks, the burner according to my present invention comprises, a plurality of bores, disposed in concentric circles, in the wall of the mouth of the gas conduit for the passage of air and inclined with respect to the axis of the said conduit so as to give rise to intersecting whirl air currents which intermingle with the diffusing gas stream discharged from the said mouth. To such end, in a preferred embodiment, the axes of the bores in one circle are deflected in plan with respect to their appurtenant radii by a uniform small acute angle to one side of the radii, and the axes of the bores in the circle or circles adjacent to the said first circle are deflected in plan with respect to their appurtenant radii by a like angle to the other side of the radii. In elevation, the axes of the bores in adjacent circles are inclined at difierent vertical angles to the axis of the said conduit. The bores in adjacent circles, further, are staggered.

By virtue of the arrangement of the air-passage bores according to my present invention, the air discharged into the gas stream, and thus also the gas, are thoroughly and intimately mixed so as to obtain perfect combustion with a minimum of excess air and in a minimum of space.

One form of invention is shown, by way of example, in the accompanying drawing, in which:

Fig. 1 is a vertical section;

Fig. 2 a top plan view, and

Fig. 3 a perspective top plan view for illustrating the directions of the air streams discharged from the inner circle of bores.

1 Claim. (Cl. 158 -116) The burner shown comprises a nozzle-shaped converging gas conduit I through which the gas flows as indicated by the respective arrow in Fig. 1. The exit end of conduit I is sharply flared outward, i. c. it forms a wide-angle difiusor cone. The air enters into the burner through the conduit 2, as indicated by the respective arrow in Fig. 1, and then flows into the gas stream through a series of

bores

3 and 4 provided in the'wall of the difiusor cone. The air, being under a higher pressure than the gas, carries the gas onward by injector-action upon being discharged from the

said bores

3 and 4.

The arrangement of the latter with respect to the axis of conduit I and to each other is as follows:

Seen in plan, Fig. 2, the axes of the air streams discharged from the inner circle of bores 3 (empty arrows) are deflected to one side of their appurtenant radii by a small acute angle of uniform size; while the axes of the air streams discharged from the outer circle of bores 4 (full arrows) are deflected to the other side of their appurtenant radii by a uniform angle of substantially equal size as in the case of the air streams from the bores 3. The points of intersection of consecutive empty 'arrows and full arrows, respectively, define an inner and an outer circle respectively, the said two circles being situated in two planes at right angles to the axis of conduit I, as is evident from Fig. l.

Seen in elevation (Fig. 1) the axes of the air streams discharged from the inside bores 3 (empty arrows) are inclined at a uniform angle with respect to the axis of conduit I, while the axes of the air streams discharged from the outside bores i (full arrows) are more steeply in clined. The full arrows, as well as the empty arrows, appear to intersect on the axis of conduit I, which, however, they do not, as is evident from g- 2 The

said bores

3, 4 are disposed in two circles, the centers of which are situated on the axis oi conduit I, and the bores of one circle are staggered relative to those of the other circle.

The air streams discharged from each circle of bores. thus, define a whirl path or vortex coaxial with the axis of the gas stream discharged from conduit I or, respectively, from the difiusor cone of the latter. The said whirl paths or vortices have a different pitch and rotate in opposite directions. In Fig. 3, the air streams discharged from the bores 3 are shown in form of pencils defining a whirl path of counterclockwise rotation.

The air entering into the burner through conduit 2, may be preheated. Since the gas flows into the burner through a conduit 1 of comparatively large cross-section, as well as at a comparatively low velocity, non-purified gas may be used without running the risk of choking up the said conduit.

The injector-action of the air streams discharged from the

bores

3 and 4 enables the gas to be supplied at a comparatively low pressure.

What I claim as new, and desire to secure by Letters Patent, is: W W A g A gas burner comprising means for forming an upwardly converging gas outlet having an outwardly and upwardly flaring discharge end, means forming an air chamber annularly surrounding the gas outlet, and a plurality of bores extending through the said discharge end from the air chamber to the gas outlet, the axes of said bores being inclined with respect to the vertical axis of the gas outlet, and means supplying air to said chamber at a pressure exceeding the gas pressure in said gas outlet means, the improvement defined by arranging the said bores at equal spacings in at least two circular rows of which the centers are situated in the axis of the gas outlet, the bores of one row being staggered relatively to those of the other row and having a different axial inclination, the axes of each two adjacent bores 01 one row intersecting in points which define a first circle of which the center is situated on the gas outlet axis, and the axes of each two adjacent bores of the other row intersecting in points which define a second circle of which the center also is situated in the gas outlet axis, the said two circles lying in two planes which are at right angles to the gas outlet axis; the axes of the bores in one row being directed, relative to the circumferences of the circles, in opposite directions, the whole being for the purpose of setting up in the air stream entering the gas stream at least two whirl paths coaxial with the axis of the gas outlet and of opposed directions with a view of intimately mixing the air with the gas.

RUDOLF JENNY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,790,927 Kreager Feb. 3, 1931 FOREIGN PATENTS Number Country Date 749,423 France L--. May 8, 1933