US2033061A - Fuel distributor for stokers - Google Patents

Description

March 35 1936. H. P, ANDERSON n FUEL DISTRIBUTOR FOR STOKERS 2 Sheets-Sheet 1 A TTORNE Y.

March 3, 1936. H. P, ANDERSON FUEL DISTRIBUTOR FOR STOKERS Filed' sept. 25, 1931 2 Sheets-Sheet 2 N V EN TOR /U/afa/maezfazz ATTORNEY.

Patented Mar. 3, 1936 UNITED STATES PATENT oFFlcE FUEL DISTRIBUTOR FOR STOKERS Application September 23, 1931, Serial No. 564,552

12 Claims.

This invention relates to fuel distributing apparatus for use with stokers of the scatter feed type and is especially adaptable for use with stokers which are employed to deliver fuel to relatively wide furnaces.

In the use of stokers of the scatter feed type for supplying fuel to such wide furnaces, it is preferable to distribute the fuel over the grates from a point within the furnace so that the fuel may be more accurately directed to all parts of the fire. When fuel is so distributed over the grates, it has been usual to secure the pressure uid head to the stoker discharge conduit, and when adjustments or repairs to the pressure fluid head were found necessary, the operation of the boiler was suspended in order that the furnace could cool sufficiently to permit the removal of the head for the necessary adjustments or repairs thereto. This resulted in a loss of fuel, time, and also in a loss of the economical use of the boiler due to its interrupted operation.

These disadvantages are obviated by the present invention, the principal objects of which are the provision of a pressure fluid head arranged to project fuel from a point within the furnace, being organized to permit its withdrawal from a point exterior to said furnace and also being arranged so that a variable adjustment exterior to the furnace may be made of the pressure iiuid head with respect to the fuel stream issuing from the stoker discharge conduit.

Other and further objects of this invention reside in the particular construction of the parts and in their combination with one another as will be apparent when the following specification is read in connection with the accompanying drawings, in which Figure 1 is a vertical longitudinal section through a portion of a furnace showing the invention in position;

Figure 2 is a plan view of the structure shown in Figure 1 showing the invention in position;

Figure 3 is a sectional view taken on the line 3-3 of Figure 1;

Figure 4 is a plan view of the pressure fluid head with portions broken away;

Figure 5 is an enlarged fragmentary view of a portion of the structure shown in Figure 4;

Figure 6 is an isometric view of the pressure fluid head; and

Figure 'I is an isometricview of the pressure fluid head support or frame.

On the drawings, the boiler is generally indicated at ID having a furnace Il, provided with agrate I2 and the backwall I3. A stoker I4 con- (Cl. 11G- 101) veys fuelfrom a suitable source of supply (not shown) and extends upwardly into the furnace I I through the grate I2 for delivering fuel thereto. The stoker I4 includes a horizontal transfer conduit I5 which passes beneath the backwall I3 and terminates in an elbow I6 arranged to receive the discharge conduit I1. The discharge conduit I'I extends upwardly into the furnace II through an opening I8 bounded by the ring member I9, which serves as a support for the grate I2 and also supports the protective wall 20 which surrounds the discharge conduit I1.

Housed within the transfer conduit I5, is a screw conveyor 2| which cooperates with the e1- bow I6 to elevate the fuel upwardly through said discharge conduit I'I, which delivers the fuel into the furnace through its mouth portion 22. A pressure fluid head 23, disposed immediately above said mouth portion 22, issues blasts of pressure fluid for projecting the fuel to all parts of the grate.

The pressure fluid head 23 is of novel form and is engageably received by a frame member 24 to permit slidable movement thereon. By arranging the pressure fluid head 23 to be slidably mounted upon the frame member 24, it is possible to move the head forwardly or rearwardly with respect to said discharge conduit mouth portion, thereby permitting more or less fuel to be projected to the side or rear portion of the furnace.

The frame member 24 is provided with a perforate bottom wall 25, parallel sidewalls 26 and a flange 2'I depending from said perforate bottom 25 whereby said frame member may be secured to the discharge conduit I'I as by means of the bolts 28. Extending outwardly from each of said sidewalls 26 is a flange member 29 which receives the dowels 30. The dowels 3l) engage the plate member 3| which partly embraces the mouth portion 22 to serve as a flat table from which fuel is projected over the grate by the pressure fluid head.

At its rearward end, the frame member 24 is provided with a relatively narrow tail piece 32 which is provided with parallel upstanding walls 33 slotted as at 34. This tail piece 32 extends rearwardly through an opening in the furnace backwall, resting freely thereon, and the slotted portions 34 receive suitable means for maintaining the pressure fluid head in position with said frame member. By securing the frame member only to said discharge conduit and at the same time, allowing it `to pass freely through the opening in the backwall, the frame member, and consequently the pressure fluid head, are unaffected by any expansion of the boiler which would cause damage to the parts of the stoker. At its forward portion, each of the parallel walls 26 is provided with an inwardly extending flange 36 which forms with the bottom wall 25, a groove 36a for the purpose as will now appear.

The pressure fluid head 23 comprises a top wall 31, a bottom wall 38, an arcuate front face 39, and the sidewalls 40. The arcuate front face 39 of said pressure fluid head is disposed immediately above the stoker discharge conduit mouth portion 22 and is provided at its bottom with a V-shaped portion 39a which offers the least resistance to the column of fuel as it rises through said mouth portion. Included between the pressure fluid head walls are the several chambers such as 4| which are separated by the partition walls 42 and are provided with jet openings 43 in the arcuate front face 39, which issue blasts of pressure fluid for projecting the fuel. A tongue 44, extending outwardly from each of the sidewalls 40, is receivable in the groove 36a of the frame member 24, thereby preventing any undue upward movement of the pressure fluid head 23 which might be caused by the upwardly rising column of fuel issuing from the discharge conduit mouth portion.

At its rearward end, the bottom wall 38 of the pressure fluid head is provided with a pair of parallel flanges such as 45 which are threaded as at 46, each being arranged to receive a stud such as 41 passing through the slotted portions 34 of the frame member 24. This portion of the pressure fluid head also extends rearwardly through the opening 35 of the backwall I3, thereby permitting the adjustment of the pressure fluid head to be made exterior of the furnace by means of the studs 41 cooperating with the slotted portions 34 and the threaded flanges 45 of the frame member 24 and the pressure fluid head 23 respectively. It will be seen that by removing the studs 41 and sliding the pressure fluid head 23 over the frame member 24 until the tongues 44 are out of engagement with the grooves 36a, it is possible to tilt the pressure fluid head until the tongues 44 are above the frame member, and then withdraw the pressure fluid head through the opening 35 of the backwall.

The rearward portion of the pressure fluid head 23 is also provided with a header 48 which receives pressure fluid from a suitable supply lead 49. A transverse wall 5U separates the header 48 from the chambers 4| and is threaded asat 5| to receive Valve seats 52, each of which communicates with its respective chamber 4|. The rearwall 53 of the pressure fluid head is also threaded as at 54 to receive the valve members 55 provided with valve stems 56 each of which cooperates with its respective valve seat 52 to control the flow of pressure fluid to each of said chambers 4|.

While but one embodiment is disclosed, this invention is also adaptable for use with other elements of a stoker or its distributing member, as contemplated by the appended'claims.

I claim:

1. In combination with a furnace having a backwall, an opening in said backwall and a grate for said furnace, a stoker discharge conduit extending upwardly into said furnace through the grate thereof, said stoker discharge conduit terminating in a mouth portion arranged for the delivery of fuel, a pressure fluid head disposed immediately above said mouth portion and arranged to discharge a blast of pressure fluid thereacross for projecting the fuel over said grate, a frame member rigidly secured to said discharge conduit forming a support for said pressure fluid head, said pressure fluid head being slidably adjustable on said frame member longitudinally of the furnace, and means adjacent the opening in said backwall for securing said pressure fluid head to said frame member in any one of a number of positions.

2. In combination with a furnace having a backwall, an opening in said backwall and a grate for said furnace, a stoker discharge conduit extending upwardly into said furnace through thegrate thereof, said stoker discharge conduit terminating in a mouth portion arranged for the delivery of fuel, a pressure fluid head disposed immediately above said mouth portion and arranged to discharge a blast of pressure fluid thereacross for projecting the fuel over said grate, and a frame member secured at its forward end to said discharge conduit and extending rearwardly through the opening in said backwall, said head being slidably mounted on said frame member and removable therefrom by sliding said head along said member and means without said furnace for securing said head in one of a number of positions.

3. In combination with a furnace having a backwall, an opening in said backwall and a grate fo-r said furnace, a stoker discharge conduit extending upwardly into said furnace through the grate thereof, said stoker discharge conduit terminating in a mouth portion arranged to issue a stream of fuel, a pressure fluid head member for projecting the fuel over the grate, said pressure fluid head member extending into said furnace through the opening in said backwall and having its forward portion disposed in the path of the stream of fuel issuing from said discharge conduit mouth portion, a frame member rigidly secured to said discharge conduit for supporting said pressure fluid head member, said pressure fluid head member being slidable on said frame member for movement longitudinally of the furnace, one of said members being provided with guideways and the other of said members being provided with tongues arranged to slide in said guideways, and means for securing said pressure fluid head member to said frame member in one of a number of positions.

4. As a new article of manufacture, a pressure fluid head for projecting fuel, said pressure fluid head comprising top and bottom walls, an arcuate front face, a rear wall, and outwardly and rearwardly diverging sidewalls, a flange member extending outwardly from each of said sidewalls, said member adapted to form one element of a. tongue and groove connection, and flange members extending downwardly from said bottom wall. said last named flange members being threaded to receive locking means.

5. As an article of manufacture, a pressure fluid head for projecting fuel, said pressure fluid head comprising top and bottom walls, an arcuate front face, a rear wall, and outwardly and rearwardly diverging sidewalls, a tongue extending outwardly from each of said sidewalls, and longitudinally extending flange members depending from said bottom wall, each of said flange membersY being provided with a laterally opening threaded hole t re,- ceive locking means.

6. As an article of manufacture, a frame member adapted to receive a pressure fluid head of a stoker, said frame member comprising a perforate bottom wall, sidewalls extending upwardly from said bottom wall, a laterally extending fiange depending from one end portion of said bottom wall, a flange extending outwardly from each of said sidewalls adjacent said end portion, each of said sidewalls at its end portion remote from said first named end portion being provided with a longitudinally elongated opening, and a flange member extending inwardly from each of said sidewalls adjacent said rst named end portion, said last named flange members adapted to form a guide for the pressure fluid head.

'7. As an article of manufacture, a frame mem- I ber adapted to receive a pressure iiuid head of a stoker, said frame member comprising a perforate bottom wall, sidewalls extending upwardly from said bottom wall, a flange extending outwardly from each of said sidewalls adjacent one end of said frame member, each of said sidewalls at its end portion remote from said rst named end portion being provided with a longitudinally elongated opening, and a flange member extending inwardly from each of said sidewalls adapted to form a guide with said bottom wall for the pressure fluid head.

8. In a fuel distributing system, la distributing member, a frame member for supporting said distributing member, said frame member being provided with a slotted ange at one end thereof and a guideway at the opposite end, and means for securing said distributing member to said frame member through said slotted flange, said distributing member having a tongue engaging said guideway whereby upward movement of said distributing member is prevented while said tongue is in engagement with said guideway.

9. As an article of manufacture, a frame member adapted to receive a pressure fluid head of a Stoker, said frame member comprising a perforate bottom wall, sidewalls extending upwardly from said bottom wall, each of said sidewalls adajcent one end of said frame member being provided with a longitudinally elongated opening, and a flange extending inwardly from each of said sidewalls,

said anges adapted to form a guideway with said bottom wall for the pressure fluid head.

10. As an article of manufacture, a frame member adapted to receive a pressure fluid head of a stoker, said frame member comprising a perforate bottom wall, sidewalls extending upwardly from said bottom wall, each of said sidewalls adjacent one end of said frame member being provided, with a longitudinally elongated opening, and a flange extending inwardly from each of said sidewalls remote from said elongated openings, said flanges adapted to form a guide for the pressure fluid head.

11. In combination with a furnace, a stoker fuel discharge conduit terminating in an open mouth portion arranged for the delivery of fuel to said furnace, a frame member rigidly secured to said conduit adjacent said open mouth portion, a pressure uid head member for projecting the fuel supported on said frame member, said pressure uid head member being mounted slidably adjustable on said frame member longitudinally of the furnace, means for securing said head member to said frame member in any one of a number of positions with respect to said discharge conduit and said frame member, one of said members being provided with guideways and the other of said members being provided with tongues arranged to slide in said guideways.

12. In a fuel distributing system, a distributing member, a frame member for supporting said distributing member, said frame member being provided with slotted fianges at one end thereof and a guideway at the opposite end, and means for securing said distributing member to said frame member through said slotted flanges, said distributing member having a tongue engaging said guideway whereby upward movement of said distributing member is prevented while said tongue is in engagement with said guideway, said means for securing said distributing member to said frame member being adjustable within the slots of the flanges to Vary the longitudinal position of the distributing member.

HOWARD P. ANDERSON.

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