USRE16906E - George keith - Google Patents

Description

" March 20, 1928. e. 16,906

.G. KEITH APPARATUS FOR DELIVERING A MIXTURE OF GAS AND AIR original Filed Sept. 19, 1916 Reissued M 20, 192a UNITED STATES PATENT OFFICE.

GEORGE KEITH, OF LONDON, ENGLAND, ASSIGNOR, .BY DIRECT AND KESNE ASSIGN- MEN'IS, TO JAMES KEITH '8: BLACKMAN COMPANY, OF LONDON, ENGLAND, A BRIT- I 'ISH COMPANY.

APPARATUS FOR DELIVERING A MIXTURE 01: GAS AND Original application filed September 19, 1916, Serial No. 121,030. Divided and application filed May 24,

1917, Serial 1T0. 170,789. Original K051359319, dated December 18, 1917. Application for reissue filed October 10, 1927. Serial No. 225,363.

This invention relates to an improved apparatus for delivering a mixture of gas and air (or oxygen) for, combustion, for example, in a gas-fired furnace, oven or other installation, and it has for its primary object.

ployed, the said method consisting in. in-

ecting one ofthe constituents of the mixture and inducing the flow of the other constituent, while governing the pressure ofthe induced constituent to maintain the pressure proportionate to the resistance offered to the flow of the mixture,v whereby variation in the resistance of the nozzle, of the furnace or the like being fired, or of the flue, may be automatically compensated for, it being understood that variation in the quality of the mixture must otherwise re-- suit from variation in the resistance to be overcome;

As pointed out in the specification of'copending application Serial No. 121,030, variation of the resistance may be due to variable heating up of the mixture before it issues from the nozzle, fluctuation, of the temperature in the furnace or the like and consequent variation in the contraction of the products of combustion, introduction or withdrawal of materials. being heated, opening or closing of doors or-of dampers, variations of pressure in the flue, or to other causes; by the present invention the efi'ect on the quality of the mixture of all such possible causes of variation may be automaticallycompensated for.

The preferred form of governing device employed comprises a diaphragm casing in which is fitted a thin membrane operatively.

connected with a valve serving to regulate,

the admission to the casing of the induced medium, the compartment of the casing at I the backpf the diaphragm being in communication with a point in the path of flow of pressure obtaining in pose in' view so to govern the gas pressure that the gas is previously-brought to a pressure equal to that prevailing at the final outlet for the products of combustion, e. g., to atmospheric pressure, be directlyinto the atmosphere, or to the pressure prevailing in the chimney.

In case the gas pressure is to be maintained at atmospheric resure, the back of the diaphragm may be eft open; if the gas isto be brought to a pressure equal to that prevailing in the chimney, the connection from the back of the diaphragm may be led to the chimney.

The invention is illustrated by way of example in the accompanying drawings in which Figure 1 is a vertical section showing the dia hragm casing and injector with a connection from the back of the diaphragm, to a point on the delivery side of the in]ector. Figs. 2, 3 and-4 represent diagrammatically threeforms of connection. Fig. 5 is a vertical section through' the diaphragm caslng. In the construction shown, the governor is designed to govern the pressure of gas gas belng the induced medium, and the injected'medium being air or oxygen. It will be understood, however, that with suitable modification the governing device may be adapted to govern the pressure of the air or oxygen where the induced medium is air or oxygen and the injected. medium is gas.

Referring to the drawings, 1 denotes the diaphragm casing in which is fitted a thin membrane 2 wh1ch is preferably disposed in a vertical plane to eliminate the efi'ect of if the final discharge butterfly valve of substantially elliptical.-

form, adapted to be seated on the machined internal surface of a cylindrical" valve casing 4 in communication with theas inlet 5-.it being understood, however, t. at any suitable form of valve, balanced or otherwise, may be provided.

The valve 3 is so mounted as to be immovable laterally though not liable to be 'ammed with grit or the like, being carried y a hinge pin passin through lugs on a bracket member 6 fitte within the casing 4.

The membrane 2 is operatively connected closed 'as' to move the membrane against the face of the dia hragm casingthe arrangement being suc as to obviate straining of the: valve.

w The connection between the back of the diaphr Y J and the injector is represented by atu -9"which is led to the expansion tube 10 of the Venturi tube and which may terminate flush with the internal'wall of the Venturi tube'with its mouthvfacing acrom -stream,. as' in Fig? 1 and 4", or'may pro'ect ereof-with' itsmouth ac- "stream,.-as. in Fig. 2, or

into the. interior down stream as in Fig, 3, or in any intermediate 7 fiositionflccording asit is intended to estab- 1 ressureabovefor below that of the the expansiontube having regard a to the" coratlitionsof constructioni'and open ation'.

v to the back of the governor diaphragm, neednance of the of'the arrangements described i be adopted,v increase or decrease of the resistance ofl'ered to, the flow is instantaneous ly nded to by the governor, .the consequential alteration of the pressure of} the gas supply to the in'ector' resulting inmainte mixture. I v

. It is to be understood that the connection not be taken from the expansionftube .but may be conveniently taken from any int f between the inlet of; the injector an the e 3 burner nozzle,-0r. even from the furnace i t self, although in the last mentioned case there will be no provision for compensation in respect of expansionf before'passage of the mixture through the nozzle.

To effect the initial adjustment of'the pro- 'portions of gas and air or to effect any desired variation ,in the ad'ustment, a cook 12 or its equivalent is fitted 1n the connection 11' for deh'vering gas from the diaphragm casing 1 to the injector.

The'cock 13 serves to'regulate the supply of air to the injector;

While the a paratus ularly applica Is for delivering a sel burntuents of the mixture, an inlet connection for the induced constituent, and a governing depoint in the path of the mixture, for autouniformity of ,quality of .anda vertically disposed illustrated is articing mixture of gas and air to gas-fired furnaces, it is to be understood that the inven tion is not confined to such application, but includes the delivery of gas and air (or oxygen) in given proportions to ovens, burners or other ins't'allationswhether the mixture to be consumed be self-burnin or otherwise.

If air (or oxygen) be the in need medium, the governing device will, of course, be interposed in theair (or oxygen) inlet connection and will serve to overn the pressure of the air (or oxygen) a mitted, while the gas conection will be taken to the nipple of the injector.

,What I claim is 1. An a paratus for delivering a mixture of gas an a comburent'medium for combustion, comprising, in combination, an injector device for injecting one of the constivice interposed in the said inlet connection and adapted to govern the pressure of the induced constituent in dependence on the resistance ofiered to the flow of the mixture, said lgoverning device comprising 'a valve and a diaphragm connected with said valve,

and 'meiins for transmitting to said dia'-- phragm the virtual pressure obtained at a matically controlling theamount of the in duced constituent or medium in proportion to the amount of the constituent or medium delivered by said injector device.' i

I 2. An a paratus for deliverin a mixture of gas an a comburent medium or combustion, comprising in combination, an injector device for injecting onset the constituentsof. the mixture, an inlet connection-for the induced constituent, and a governing device 1 interposed in the said-inlet connection and adapted to govern the pressure of the induced constituent in de dence on the resistance ofiered to the ow of the mixture, saidgov'erning vdevice com rising a valve 1 iaphragm connected'withfsaid valve,,and means for transmitting-the fluid pressure resulting from the o ration of said injector device to the diap ragm," ior automatically controlling the amount ofthe induced constituent'or medium inproportion to the amount ofthe con gstituent-or medium delivered by said injector {-deviceilf .3. An apparatus for "delivering a mixture of gas and a comburent medium for combustion, com rising, in combination, an --m ector device or injection of one of the constituents of a combustible mixture, an inlet connection for induction of the other constituent thereof, and a governing device for governing the'pressure, of the-induced. constituent, said governing device comprising a pivoted valve insaid inlet connection,

a valve-controlling device comprising a diaphragm forming a part of the wall of said induced constituent of the mixture will be inlet connection and roviding a chamber automatically regulated in proportion to the at the outer. side of said diaphragm, a spring fluid pressure of said mixture. 10 connecting said diaphragm with said valve, In witness whereof I have signed my'name 5 and a connection forming a communication to this specification.

' between said chamber and the path of flow of the mixture; whereby the amount of the I I GEORGE

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