US2141619A - Tuyere - Google Patents

Description

Dec. 27, 1938. v. SAUTER TUYBE Filed Feb 27, 1935 m mw, M M

Cil

Patented Dec. 27, 1938 UNITED STATES TUYRE William V. Sauter, Philadelphia, Pa., assigner to American Engineering Company, Philadelphia,

Pa., a corporation of Pennsylvania Application February 27, 1935, seriai No. 8,572

9 Claims.

This invention relates to tuyres, and more particularly to the tuyre blocks `employed in stoker furnaces.

During operation of a furnace thin spots often occur in the fuel bed which result in decreasing the resistance to the flow of air through the tuyres disposed therebeneath. This reduction in resistance causes the velocity of the air owing through such tuyres to increase to such an extent that the fuel is often blown from the grates and as a result damage to the grates not only occurs but the effective area of the fuel bed is materially reduced. 'I he heavier portions of the fuel bed under such conditions are also deprived of some of the air necessary to insure complete combustio-n. n

One object of the present invention is to construct a tuyre block in such a manner as to reduce to a minimum the above mentioned difficulties.

Another object is to provide a tuyre block wherein the means thereon defining air passages are so disposed that the velocity of the air flowing therethrough decreases as it approaches the 5 discharge end of ysaid block.

Another object is to provide air passage defining means on each tuyre block in such a manner that the air passing therethrough is evenly distributed over the entire discharge end thereof.

A more specific object is to provide a tuyre block with a restricted inlet o-pening and to provide a series of relatively narrow passages leading therefrom, which passages diverge toward the discharge end of said block so that the velocity of the air discharging therefrom will be relatively low.

Other and further objects will become apparent as the description of the invention progresses.

Of the drawing: l

Fig. 1 is a perspective view of the tuyre block in inverted position showing the arrangement of the air passages provided therein.

Fig. 2 is a plan view of the tuyre block shown in Fig. 1.

Fig. 3 is a sectional side view taken on line 3 3 of Fig. 2, and f Fig. 4 is a side elevational view of two tuyre blocks in assembled position.

Referring to the drawing, the numeral I indicates generally a tuyre block which in the present instance consists of a substantially flat body portion 2, having a rounded and slightly beveled nose portion 3. The. under side of the tuyre block has provi-ded at the sidesv thereof a pair of substantially vertical supporting portions 4 and 5,

the forward or as shown, the right hand end of each of which terminates in a beveled portion which, in assembly on a Stoker, rests upon the side plates of the retorts in a well known manner. The rear or left hand ends of portions Il and terminate substantially midway between the front and rear ends of the tuyre block, and the inner surfaces l Vand 8, respectively thereof, are substantially arcuate in form. A pair of ribs 9 diverge forwardlyrfrom a point lil near the rear end of the tuyre block substantially on the longitudinal center line thereof. Ribs 9 terminate at the forward ends thereof in a semicircular rib il and form therewith a substantially stream line abutment to the incoming draft air. A cross rib l2 also extends between and connects the ends of rib ll for the purpose of reinforcing the structure. Extending between ribs El and the inner arcuate portions 'l and 8 of members 4 and 5 are a series of alternately .disposed long and short ribs i3 and lli, respectively. As shown in Figs. l and 2, these ribs are relatively wide at the forward ends thereof and gradually taper off toward the rear. By this construction the various air passages defined by these ribs are narrow or constricted at the inlet ends thereof and diverge toward the rear so that their discharge ends are relatively wide. A locking hook l5 is provided intermediate the ends of the tuyre block and between ribs 9, and a substantially rectangular slot i6 is provided slightly to the rear of said hook. In assembly the hook l5 of each tuyre block engages the end of the yrectangular slot I6 of the next lower tuyre block of the series, as shown in Fig. 4. The hook I5 of each tuyre block being disposed in the dead space between ribs 9 is out of the .path of the incoming draft air and thus prevents the formation of eddy currents. Air leakage between the tuyres through slots i6 is also prevented since these slots communicate with the dead spaces defined by ribs 9, il and i2. The lower surfaces of elements il and 5, and of ribs 9, il, l2,'i3 and i4, lie substantially in the same horizontal plane and when assembled on the Stoker engage the upper flat surface of the next lower tuyre block of the series as shown in Fig. 4.

It will be noted that the inner arcuate surfaces 'I and 8 of side portions i! and 5 form with ribs 9 and substantially semi-circular rib il, a pair of throats lIl of substantially Venturi form. The forward ends of each of the ribs I3 and lfl are also of rounded construction so that the air inlet ends of the passages dened by said ribs are also of substantially Venturi form. Thus a series of highly efficient passages for draft air are provided in each tuyre block. The arrangement of the long and short ribs I3 and I4 effectively subdivides the inlet passages l1 into a series of separate passages whereby the incoming Vdraft air is evenly distributed overthe entireV .discharge end of each tuyre block, thus insuring efiicient combustion of the fuel. l

It is also apparent that the diverging. construction of the air passages on each tuyre block toward the discharge end thereof effects a reduction in the discharge velocity of the air passing therethrough and as a result the tendency for blow holes to occur, especially at the thin portions of the fuel bed, is greatly minimized. Thus by preventing blowing of the fuel from such thin portions the fuel feeding mechanisms will be given the opportunity to build them Aup until they become normally uniform again before damage occurs to the grates. Damage to the grates, and also uneconomic operation of the furnace due to such blow holes are therefore reduced to a minimum by the present construction and as a result a material saving is effected in the operating cost of the furnace. Y

While the embodiment herein shown is admirably adapted to fulll the obj ects primarily stated, it is to be understood that the invention is not to be limited to the said embodimentsince it may be embodied in other forms, all coming within the scope of the claims which follow.

What is claimed is:

1. A tuyre block, comprising a relatively flat body portion having when in operative position a substantially rounded rearwardly disposed discharge end, a pair of supporting members depending from the lower surface of said body portion at the opposite` sides thereof, each of said supporting members having a vertically disposed arcuate inner surface, a pair of ribs diverging forwardly from a point near Vthe rearmost end of said discharge end and a substantially rounded rib near the forward end of said body portion connecting the forwardly disposed ends of said rst mentioned ribs and forming a substantially stream line abutment for the incoming draft air, and said ribs forming with the arcuate inner surfaces of said supporting members, a pair of air passages of substantially Venturi form. l

2. A tuyre block, comprising a relatively flat body portion having when in operative position a substantially rounded rearwardly disposed discharge end, a pair of supporting members depending from the lower surface of said body portion at opposite sides thereof, each of said supporting members having a substantially vertically Y disposed arcuate inner surface, a pair of ribs diverging forwardly from a point near the rearmost end of said discharge end, a substantially rounded rib near the forward end of said body portion connecting the forwardly disposed ends of said first mentioned ribs and forming a substantially stream line abutment for the incoming draft air, said ribs forming with the arcuate inner surfaces of said supporting members a pair of air passages of substantially Venturi form, and a plurality of ribs extending longitudinally of said body portion between said arcuate members and saidV first mentioned ribs, said last mentioned ribs subdividing said air passages into a series of smaller passages whereby the air owing through said passages is evenly distributed overthe entire discharge end of said tuyre block.

3. A tuyre block, comprising a relatively at body portion having when in operative position a substantially rounded rearwardly disposed discharge end, a pair of supporting members depending from the lower surface of said body portion at the opposite sides thereof, each of said supporting members having a vertically disposed arcuate inner surface, a pair or ribs diverging forwardly from a point near the rearmost end of said discharge end, a substantially rounded rib near the forward end of said body portion connecting the forwardly disposed ends of said'firstmentioned ribs and forming a substantially stream line abutment for the incoming draft air, said ribs forming with the arcuate inner surfaces of said supporting members a pair of air passages of substantially Venturi. form, and a locking hook on said body portion disposed between said ribs.

4. A tuyre block, comprising a relatively flat body portion having when in operative position a substantially roundedV rearwardly disposed .discharge end, a pair of supporting members depending from the lower surface of said body portion at the opposite sides thereof, each of said Vsupporting members having a vertically disposed arcuate inner surface, apair of ribs diverging forwardly from a point near the rearmost end of Vsaid discharge end, a substantially rounded rib near the forward end of said body portion connecting the forwardly disposed endsv of said first mentioned ribs andY forming a substantially stream-line abutment for the incoming draft air, said'ribs forming with the arcuate inner surfaces Vof said supporting members a pair of air'passages of substantially Venturi form, a series of longitudinally disposed ribs provided in said passages, said ribs lhaving substantially rounded forward ends and arranged in diverging relation with respect to each other toward said discharge end, thereby subdividing said rst mentioned passages intov a plurality of smaller passages, each having a throat opening of substantially Venturi form, and a second series of shorter ribs interspersed with said second mentioned ribs, each of vsaid last mentioned ribs having a forward end of substantially rounded form and arranged in di- Verging relation with said secondV mentioned ribs thereby subdividing said second mentioned passages into another series of smaller passages, eachv having an inlet openingv of substantially Venturi form, whereby the air flowing through all said passages is evenly distributed over the entire discharge end ofsaid tuyre block, and the Velocity of the air passing therethrough is substantially reduced as it approaches said discharge end thereof.

5. A tuyre block, adapted for arrangement with similar tuyre blocks in superimposed stepped relation, comprising a relatively flat body stantially rounded rearwardly disposed discharge end, aY pair of supporting members for said body portion depending from the lower surface at the opposite sides thereof, each of said supporting members having a substantially vertically disposed arcuate inner surfac-e, a pair of ribs di- .verging forwardly from a point near the rearf `portion having when in operative position a sub- Y the arcuate inner surfaces of said supporting members a pair of air passages of substantially Venturi form, and a plurality of ribs extending longitudinally of said body portion between said arcuate members and said rst mentioned ribs and arranged in diverging relation toward said discharge end, said last mentioned ribs also having substantially rounded end portions subdividing said air passages into a series of smaller passages whereby the air flowing through said passages is evenly distributed over said discharge end, and the lower surfaces of all of said ribs and supporting members lying in substantially the same horizontal plane and adapted in assembly to engage the upper surface of the next lower tuyre of the series.

6. A tuyre block comprising a relatively flat body portion, having an air inlet end and an air discharge end, a pair of projections extending from one face of said body portion at the opposite sides thereof, said projections having substantially arcuate inner surfaces, a pair of ribs diverging toward said air inlet end from a point near the extreme end of said discharge end, a substantially rounded rib provided intermediate the ends of said body portion, connecting the ends -of said rst mentioned ribs and forming a streamline abutment for the incoming draft air, and said ribs forming with the arcuate inner surfaces of said projections a pair of air passages of substantially Venturi form.

'7. A tuyre block comprising a relatively flat body portion having an air inlet end and an air discharge end, a pair of projections extending from one surface of said body portion at the opposite sides thereof, said projections having substantially arcuate inner surfaces, a pair of ribs diverging toward said air inlet end from a point near the extreme end of said discharge end, a substantially arcuate rib provided intermediate the ends of said body portion connecting the ends of said first mentioned ribs and forming a substantially streamline abutment for the/incoming draft air, said ribs forming with the arcuate inner surfaces of said projections a pair of passages of substantially Venturi form, and a plurality of ribs extending longitudinally of said body portion between said projections and said rst mentioned ribs, said last mentioned ribs subdividing said air passages into a series of mentioned member diverging toward said air inlet end and terminating in a substantially arcuate portion whereby the said passages dened by said longitudinally extending member and said projections have restricted throats of substantially Venturi form and diverging side walls, a hook projecting from said longitudinally extending member for securing the tuyre block in position, a series of relatively long longitudinally disposed ribs provided between said longitudinally extending member and said projections dividing said passages to a plurality of smaller passages, and a second series of shorter ribs interspersed with said first mentioned ribs subdividing said last mentioned passages into a series of smaller passages, and the ends of all of said ribs extending toward the inlet end of said tuyre block being of enlarged construction and tapering toward said discharge end, whereby the passages defined thereby have restricted throats and diverging side walls.

9. A tuyre block comprising a relatively flat body portion, having an air inlet end and an air discharge end, a pair of projections extending from one face of said body portion at the opposite sides thereof, said projections having substantially arcuate inner surfaces, a pair of ribs diverging toward said inlet end from a point near the extreme end of said discharge end, rib means provided intermediate the ends of said body portion connecting the ends of said rst mentioned ribs, said ribs and the arcuate inner surfaces of said projections defining a pair of passages for draft air, and a plurality of ribs extending longitudinally of said body portion between said projections and rst mentioned ribs, said last mentioned ribs subdividing said rst mentioned passages into a series of smaller passages.

WILLIAM V. SAUTER.

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