US2453487A - Sealing means for traveling grate stokers - Google Patents

Description

NOV. 9, 1948. BEERS 2,453,487

SEALING MEANS- FOiR TRAVELING GRAI'E STOKERS Filed Feb. 16, 1945 2 Sheets-Sheet 1 INVENTOR. ROYCE L; BEERS ATTORNEYS Nov. 9, 1948. R. L. BEERS SEALING, MEANS FOR TRAVELING GRATE STOKERS 2 Sheets-Shet 2 Filed Feb. 16, 1945 INVENTOR.

ROYCE BEERS ATTO RN EYS Patented Nov. 9, 1948 SEALING FOR TRAVELING Gem s'roKEns.

Royce L. Beers, Birmingham, Mich assignor to Detroit Stoker Compa poration ofMichigan ny, Monroe, Mich; a cor- Application February 16, 1M5, S i N 5 8 i 2 Claims. (Cl. 110-40) The invention relates to'stokers of that type in which an endless grate travels forward from the bridge'wall-towards an ash discharge at the fur- Such construction is shown in myformer patent, 2,302,173,- of November 1'7, 1942. With such constructions the travelling grate separatcslf'the combustion chamber from an air pressure chamber' therebeneath, which latter suppliesair passing through apertures inthe grate bars to support combustion of the 1 fuel thereon. It .is,

therefore important to maintain an airseal ber tween the grate and the walls of the combustion chamber and more particularlyxbetween the portion of .the grate entering said combusthe grate "passing upward about the supporting sprockets and also-to place a series of tuyres in the angle between the front face of the bridge wall and the upper face of the grate. These tuyeres permit a limited quantity of air to pass into. the fuel at this point but prevent an unrestricted fiow of air through the space between the grate bars and bridge wall. Inasmuch, however, as the upper portions of the grate bars are unmachined castings, it is difficult to maintain a joint between the same and the tuyres without interference with the travelling of the grate.

It isthe object of the invention to obtain a construction which maintains a more efiective seal between the grate and the pressure air chamber therebeneath which, at the same time, permits free movement of the grate without interference by such sealin means. To this end the invention consists in the construction as hereinafter set forth.

In the drawings:

Fig. 1 is a longitudinal section through a portion of the travelling grate including the portion passing upward around the sprockets adjacent to the bridge wall together with air sealing means;

Fig. 2 is a side elevation of one of the tuyeres and the means for pivotally anchoring the same;

nace front and fuel is depositedon said grate by an impeller fuel feeder or thelike which projects the fuel from the front over the grate.

bars A, each' pivotally connected to supporting chains and passing around sprockets B and horizontally over supporting rail 0 towards thefurnace front." The sprockets for the upwardmoving portions of the chain are arranged adjacent to the bridge wall D whichlatter overhangs said sprockets and the portion of the chain passing therearound; There is also a scgmentatcasting E which is sufficiently spaced from the grate bars passing about the sprockets to form an air channel for supplying air to the tuyres as hereinafter described. The casting E has at its upper end. a hook portion E" for engagingthe hooked'rear ends F'"of a series of tuyres F. The forward portions of these tuyres extend illtOythB furnace chamberand rest upon the grate bars.

Each tuyre is of inverted channel shape cross section having side flanges F and a centralrib F The forward end F is obliquely inclined and air ports F are formed therethrough to connect with theair spaces within thechannelm The sidesF 'andrib'l l are also providedwithan obliquely inclined cam portion F which will ride over any irregularity or projecting portion of the grate bar lifting the tuyre to avoid any obstruction to the movement of the grate. However, the forward portions F normally rest on the grate bars to form a substantial air seal therebetween so that the only escape for the air is through the ports F The bridge wall D may be of any suitable construction but, as previously described, has a portion which overhangs the portion of the chain passing about the sprockets. This portion must provide suflicient clearance to permit the lifting of the tuyeres when necessary but, at the same time, it is important to seal between the bridge wall and the tuyeres so as to avoid leakage of air. This is accomplished by placing a flexible resilient material between the bridge .wall and the tuyeres, such as an asbestos packing G. 'With the construction described the pressure air beneath the grate is free to pass in the channelbetween the segmental member B and the chain into the air spaces within the hollow .tuyres. From the latter the air will pass through the ports F in the front portion F and into the fuel lying adjacent thereto, assisting combustion and avoiding the piling up of fuel at this point. Each of the tuyere members is free to lift so as to ride over any projection in the portlon of the grate bar therebeneath but normally all of these tuyres are in close proximity to the grate. It is necessary to occasionally renew tuyres. To permit of this, I have provided a tion of bridge wall may be used, I have specifically illustrated a construction in which said bridge wall is supported by water tubes D connectedjto a transversely extending header D The packing G is supported by a plate D extending between;

the header D and the segmental casting E1 and also extends forward of this plate over the tuyeres F. As the packing G is flexible .and,yield-.

ing, it will not interfere with the rise' of the tuyeres F whenever this is occasioned by irregularities in the grate bars.

My invention isalso applicable to stoker con.- structions where the tuyeres between the bridge wall and grate are omitted but where there is still the necessity for forming an effective air seal. For such construction the pivoted member F does not constitute ajtuyrebut by resting on the grate bars seals off any air, which might otherwise pass around with the sprockets and chain. 7 v e What I claim as my invention is: 1

1. In a stoker the combination with a traveling grate and a furnace wall adjacent to oneend thereof, of sealing means between said grate and surface of the grate. r

1 2. In astoker, the combination with atraveling grate and a sprocket around which said grate passes, of a segmental member passing about a 1 portion of said sprocket and having a hooked end with a recess therein adjacent to said hook, a second member having a hooked end insertable through said recess into engagement with the aforesaid hooked end, said second member extending over said grate in the direction of travel thereof to rest thereupon, and a locking bar for engaging said recess to hold said hooks in engagement with each other while permitting the pivotal movement of said second member to ride over irregularities in the surface of the grate.

ROYCE L. BEERS.

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

UNITED STATES PATENTS Number Name Date 638,089 Brown Nov. 28, v1899 700,831 Sargent May 27, 1902 1,168,712 C'rowe Jan. 18, 1916 1,198,841 Hand, Jr Sept. 19, 1916 1,435,948 Van Brunt Nov. 21, 1922 1,513,987 Hare Nov. 4, 1924 1,535,961 Strong Apr. 28,, 1925 1,554,973 Skelly Sept. 22, 1925 1,578,016 Davy et al. Mar. 23, 1926 1,672,413 Holt June 5, 1928 1,808,479 Ritter June 2, 1931 1,832,459 Haniman Nov. 17, 1931 1,879,732 Chadwick Sept.27, 1932 I 2,092,080 Lemaire Sept. 7, 1937 2,110,452 Moyer Mar.,8, .1938 2,302,173 Beers Nov. 17, 1942 FOREIGN PATENTS I,

Number Country Date 326,410 Germany Sept. 27, 1920 585,440 Germany Oct. 4,, 1933

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