US2675869A - Gas mixer - Google Patents

Description

M. E.WARD

April 20, 1954 GAS MIXER Filed April 18 1951 INVENTOR. Mark fhbra w yw/ Patented Apr. 20, 1954 UNITED TE Ton-"Iss Mark E. Ward, Columbus, .Qh io, assign: to Surface Combustion Corporation, Toledo, Ohio, a

corporation of- Ohio Application Ap'niis, 1951, Serial No.221,643

This invention relates to gas mixers of the type where a jet of fuel gas from a nozzle is directed into the mouth of a mixing tube in a manner to entrain primary air, mixers of this type being commonly employed with gas burners.

It is well known that air in a dwelling contains lint and that in course of time this lint tends to clog an ordinary air shutter for a gas mixer such as for example a rotary type of air shutter. The object of the present invention is to provide an air shutter of a type that lint in the air cannot readily clog.

For a consideration of what I consider to be novel and my invention, attention is directed to the following specification and the concluding claims thereof.

In the accompanying drawing this specification- Fig. 1 is a side elevation with parts in section of apparatus embodying the present invention.

Fig. 2 is a sectional view on line 2-2 of Fig. 1.

Fig. 3 illustrates a modified form of the invention.

Fig. 4 is a sectional view on line 4-4 of Fig. 3.

Fig. 5 illustrates another modified form of the invention.

Fig. 6 is a sectional view on line 6-6 of Fig. 5.

The apparatus with which the present invention has special utility comprises a mixing tube generally indicated at In, the same being slidably supported in a conduit I l leading to a burner l2, the conduit being shown as supported on a bracket l3 on a base member H. The throat of the mixforming part of 2 Claims. (01. 158,-118) ing tube is indicated at IS, the same having a For reasons presently appearing, the external diameter of the hollow head I9 is such that a substantial portion of its length from the leading face 22 of the end wall I8 is adapted to be telescopically received, like a piston, by the leading end of the throat l5, the range of axial adjustment of said tube It! being such that it may be backed away from the leading peripheral edge of said face 22 to provide an air gap of substantial size for the admission of a relatively large quantity of air to the mixing tube depending on the kind of fuel being used. On the other hand, where the quantity of air required to be admitted to said throat is so small that the leading peripheral edge of said face 22' and .of said throat would have'to .be objectionablyclose together from the standpoint of linting, the present invention, as will presently appear, provides a relatively unrestricted air-inlet port whose effective size may be readily adjusted by varying the distance to which the leading edge of said face 22 extends into said throat I5.

In the form of the invention shown in Fig. 1, the said relatively unrestricted air-inlet port for relatively small quantities of air is generally indicated at 23, the same being formed by a notched or slanting portion 24 on the leading face 22 of said end wall 18 in a direction away from said throat, the slant being shown as beginning at a line or chord below the nozzle ll. It will be readily appreciated that the effective size of said port 23 can be varied as desired by varying the degree to which the leading peripheral edge of said face 22 extends into said throat [5.

In the form of the invention shown in Fig. 3, the leading face of the front end wall I8 of the head I9 is identified by reference numeral 25, the entire surface of said face 2 5 being in a common plane in contra-distinction to the face 22 in Fig. 1 which has the slanting portion 24. In Fig. 3, the side wall of the front portion of the throat I 5 is provided with a triangular or V-shape aperture 26 whose apex is down stream from the leading edge of said throat. When the leading peripheral edge of said face 25 is telescopically received by the leading edge or end of the throat l5, said aperture serves as a relatively unrestricted port for the admission of air to the mixing tube and since the tube is axially adjustable relative to said face 25, the effective size of said port may be varied as desired as will now be readily understood.

In the form of the invention shown in Fig. 5, the air shutter comprises a cylindrical flange 21 on the hollow head 28 to which the gas supply 20 delivers and from the front end of which the nozzle l1 extends, the diameter of said flange being such that it may be telescopically received, like a piston, by the leading end of said throat l5. The leading face 29 of the flange is in a plane which is inclined tothe axis of said throat, the entire face of said flange being in said plane. Since the throat I5 is adjustable axially relative to said flange, by varying the degree to which the flange 21 extends within said throat it follows that the effective size of air inlet port between the trailing edge 30 of the face 20 of said flange 29 and the leading end or edge 3| of said throat may be varied as desired.

From the foregoing description, it is believed to be apparent that the present invention provides an air shutter which is well adapted for its intended purpose.

What I claim as new is:

1. In gas mixers formed by a nozzle for discharge of gas into a conduit and an axially movable mixing tube forming part of said conduit and adapted to move toward saidnozzle to constitute an air passage between the leading outer edges of said nozzle and tube as the tube moves toward the nozzle, the improvement wherein said leading outer edge of said nozzle is notched to form a wider and relatively unrestricted air passage into the conduit at one point around the periphery of said leading edge as said tube is moved toward said nozzle.

2. In gas mixers formed by members comprising a nozzle for discharge of gas into a conduit and an axially movable mixing tube forming part of said conduit and having a flared mouth, and forming in a closed position a contact area between the nozzle and the tube, a substantial portion of said contact area of one of said members removed to form a wider, relatively unrestricted air passage into the conduit at one portion of said contact area.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 422,299 Danforth etal Feb. 25, 1890 1,013,000 Dowins Dec. 26, 1911 1,249,382 Hale Dec. 11, 1917 1,252,707 Lewis Jan. 8, 1918 1,286,493 Bailey Dec. 3, 1918 1,316,682 Calef Sept. 23, 1919 1,411,063 Needham Mar. 28, 1922 2,269,333 Bloom Jan. 6, 1942 FOREIGN PATENTS Number Country Date 252,448 Great Britain May 25, 1926

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