US514631A

US514631A - David p

Info

Publication number: US514631A
Authority: US
Publication date: 1894-02-13
Anticipated expiration: 1911-02-13

Description

DQP. STIR-K.

(No Model.)

GAS MIXER.

Patented Feb. 13, 1894.

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DAVID P. STIRK, OF INDIANAPOLIS, INDIANA.

G A S M I X E R SPECIFICATION forming part of Letters Patent No. 514,631, dated February 13, 1894.

Application filed March 11, 1893. Serial No. 465,576. (No model.)

To all whom it -ma y concern:

Be it known that 1, DAVID P. STIRK, a citi zen of the United States, and aresident of Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Gas-Mixers, of which proved mixer in elevation, as applied to the gas supplying nipple. Fig. 2 shows the same in longitudinal section. Fig. 3 is a cross-section taken at the base of the mixer showing the manner of securing it to the gas supplying nipple; and Fig. 4 shows the nipple in side and in endviews. Fig. 5 is a top view of the exit end; and Fig. 6 is a cross-section through the exit openings.

A single casting forms the body of the mixer. It is cylindrical and its interior chamber is preferably tapering from its inlet to its outlet end. It is of two diameters which at their junction form an interior beveled wall a inclining upward toward the exit end so as to form a deflecting shoulder. Its part b of least diameter terminates in a solid end or cap 0, and has openings 61 in its walls just beneath its solid end for the exit of the gas. These openings are preferably of oblong form to give a larger area for the passage of a large volume of air and gas to the burner, which may be of any suitable construction and applied to the upper end of the mixer. The part c of greatest diameter of this casting is open at its base and has a yoke or open frame f extending from its open end formed with a circular opening 9 central with the mixer chamber, within which opening the supply nipple h is secured so that its orificet' will be about half an inch back of the entrance or inner open endj of the mixer chamber, and therefore, it will deliver the gas within the space between the yoke arms and outside of the mixer, so that the volume of gas issuing from the nipple orifice under pressure will create a vacuum and carry with it into the mixer-chamber, a large volume of air. The supply nipple h is made with a cylindrical neck m fitting the central opening in the yoke, a shouldered part 71. fitting against the outer end of the yoke and with fins or ribs r on the nipple sides. The central yoke opening has groovesson itsinner walls which correspond with the fins on the nipple and permit the latter to be inserted through the yoke opening and then turning it to engage the said ribs with the yoke and thus secure the nipple in place by aslip-lock. This construction permits of the convenient connection and separation of the mixer and nipple, and avoids the expense and trouble of screw threaded connections. I prefer to form the inner walls of the mixer chamber with projections, fingers or knobs it, having any suitable disposition that will best promote and assist in the mixing of the air and gas in its passage to the exit openings and contact with the walls of said chamber and in its rebounding action within the chamber, and I prefer to confine these projections to that part of the chamber of least diameter, because it is in this part of the chamber where the gas and air are more intimately brought together. I prefer to make the mixing chamber tapering as stated to give the advantage of bringing the flowing volume of air and the flowing volume of gas gradually together as they reach the exit openings; and I make the receiving end of the mixing chamber the largest for the more free admission of the air and the creation of a vacuum at a point outside of and within the entrance of the chamber. As shown the area of the exit openings is about two thirds of the circumference of the walls, and the solid parts which form them- I prefer to make beveled or rounding on their inner sides so as to facilitate the free outflow of the mixture to the burner. In other words I make the walls of the exit openings t0 flare outward all around. The nipple has a screw threaded part to by which it is attached to the gas supply-pipe and it may have one or more orifices. I prefer to make the nipple case-hardened to prevent the ori fice being drilled larger by the consumer, as the capacity of nipple is always suited to the capacity of the mixer.

In the drawings the arrows indicate the course of the mixing flow in the mixing chamber to produce the perfect mixture of the gas and air therein. The gas under pressure from the nipple creates a vacuum at a point outside the chamber and thereby gives a freer and a greater flow of air into the chamber with the gas, the volume of air surrounding the volume of gas. The air impinging upon the surface ais deflected inward mixing with the gas. The flow striking the solid cap of the chamber is thereby caused to rebound in counter currents over the studded walls of the chamber and thereby produce a further I commingling of the air and gas in the chamber between the beveled shoulder and the exit openings. This cushions the flow at the exit openings and prevents a spurting and frictional action of the outflow, and. this is what renders the action of the mixer noiseless. It is this cushioned and retarding eiiect of the outflow at the exit openings that prevents flashing back of the flame into the mixing chamber. The action of the wall deflectors is to break and deflect the flow into small eddies or circles and thereby thoroughly mix the air and gas without interfering with the proper flow to the exit-opening through which the flow will take place at a pressure which gives a satisfactory delivery and force to the blaze at the burner, and to give a perfect c0mbustion and noiseless action. The outer wall of the casting has a screw thread just below the exit side of the openings, by which to attach the burner not shown.

It is evident that immaterial departures may be permitted from the general construction and arrangement of parts contributing toward my invention, and for this reason I do not wish to be understood as limiting myself thereto in precise detail and construction, as for instance, the lower part of the mixing chamber may not be tapering; and the nipple maybe secured by other means than that shown.

I claim as my improvement- 1. A gas and air mixer consisting of a chamber of two diameters, the one of least diameter having its walls studded with projections or knobs and having a, solid cap at its exit end, for the purpose stated.

2. A gas mixer consisting of a chamber having a solid cap at its exit end and its inner walls studded with projections or knobs, for the purpose stated.

3. A gas mixer consisting of a chamber of greater length than width, its greatest width being at its inlet end and its least width at its exit end and tapering from its inlet to its' outlet, its smallest end terminating in a solid cap having exit openings in its walls, said chamber divided by a beveled shoulder and that part between the exit and the said shoulder being studded with wall projections, substantially as described.

In testimony whereof I have hereunto signed this specification in the presence of two subscribing witnesses.

DAVID P. STIRK.

WVitnesses:

L. B. SW'IFT, W. W. WINSLOO.