US2094998A - Marine stoker - Google Patents

Description

9 ibdl i Oct. 5, 1937. w. H, R. MARSDEN MARINE STOKER Filed my 24, 1952 2 Sheets-Sheet 1 ATTORNEY.

Get .55, 1937.

w. H. R. MARSDEN MARINE STOKER Filed May 24, 1932 2 Sheets-Sheet 2 INVENTOR. M/liam ffK/Yazam ATTORNEY:

Patented Oct. 5, 1937 UNITED STATES PATENT oFFIcE mesne assignments, to The Standard Stoker Company, Inc., New York,'N. Y., a corporation of Delaware Application May 24, 1932, Serial No. 613,231

4 Claims. 7 (Cl. 110-101) This invention relates to stokers for use in firing the furnaces of a boiler such as the furnaces of the well known Scotch boiler used in maritime service, and has for its principal object the provision of a stoker which feeds fuel to each furnace of a boiler, the stoker comprising a fuel transfer conveyor receiving fuel from the bottom of the fuel bunker, a single upright elevator receiving fuel from said transfer conveyor and a plurality of devices'for conducting the fuel from said single upright elevator to each of said furnaces.

It is also an object of this invention to provide a stoker for feeding fuel to each furnace of a boiler, the stoker including a single upright fuel elevator which elevates the fuel to a point sufficiently high above the firebed of each of the furnaces to cause the fuel to drop by gravity through suitable tubes from such point to the stoker fuel distributors. also contemplates the provision of a novel fuel apportioning mechanism whereby the amounts of fuel delivered byfithe fuel elevator to each of the tubes may be readily and positively varied by the stoker operator. 7

'Further objects of this invention reside in the novel arrangements of parts and in their relation one with another and also in theprovision Y of a novel fuel bin and stoker trough arrangement which permits the flow of fuel into the trough to be readily controlled and at the same time providing access to the stoker conveying mechanism.

On the drawings, Figure 1 is a Vertical longitudinal fragmentary section through a boiler showing a furnace thereof in central verticallongitudinal fragmentary section, with the invention shown in elevation, a portion of which has been broken away, 40 Figure 2 is a plan view of the structure shown in Figure 1, the boiler'and fuel bunkers being shown in fragmentary section and the grates omitted,

Figure 3 is a sectional view taken on the line 3-3 of Figure 1, showing the boiler in front elevation,

Figure 4 is a section taken on the line 4-4 of Figure 2,

Figure 5 is a fragmentary section taken on the line ,5-5 of Figure 1,

Figure 6 is an enlargedsectional View taken on the line 6-6 of Fig. 3,

Figure 7 is a plan View of the structure shown in Figure 6, r 1

This phase of the present invention Figure 8 is a front elevation of the fuel distributor, and r Figure 9 is a plan view of Figure 8. Referring to the figures which illustrate the preferred embodiment of this invention, the boiler room of a vessel is shown at Ill and its floor at H above which are mounted the fuel bunkers l2, I2w, each provided with front and rearrwalls. shown at l3 and is preferably of the Scotch type comprising a drum l4 and the cylindrical furnaces l5 and i6. Each of the furnaces l5 and I6 is provided with a fire grate l1 and access doors such as l8 through which manual firing of each furnace may be effected.

A suitable stoker mechanisms conveys fuel from the fuel bunker 12 into the furnaces l5 and 16 in a manner which will now be described. The stoker S includes a fuel transfer conveyor-l9 which receives fuel from the bunker 12 through its open mouthed trough 2B. The fuel transfer conveyor 19 preferably ismounted wholly beneath the floor II in order to allow freedom of movement in the boiler room It]. A conveyor screw 2! is mounted within the transfer conveyor 19 and urges fuel forwardly into the hopper 22 of the fuel elevator 23, which elevator comprises the upright casing 24 secured to the upper portion of the hopper 22. The elevator 23 is preferably disposed on the vertical center line of the boiler 13 and has a fuel elethe structure shown in A boiler for generating steam is vating screw 69 mounted therein for moving the fuel upwardly as the same is delivered into the hopper by the conveyor screw 21. Surmounting the upright casing 24, is the tubular extension 65 which terminates a sufficient distance above the fuel distributors 32, 3 3 that tube members such as 66, 61 may be utilized for conducting fuel by gravity to each of said distributors. The fuel distributors 32 and 33 extend forwardly from the lower outward extremities of the tube members 66 and 6'! and enter the furnaces I5 and I6 respectively at points abovethe level of the fire grates therein to insure proper distribution of the fuel thereo-ver.

The means for driving the screw conveyors of the stoker S include a prime mover 44 which drives the gearing 45 through the forwardly extending shaft 46 for operating the elevating screw 69. Extending rearwardly from the prime mover 44 and operatively connected thereto, is a shaft 41 which transmits power to gearing (not shown), housed in the casing 48 at the rear of the open parent that the fuel bunkers l2, lZa are separated from each other by the laterally spaced side walls 49, 5!}, thereby providing an alcove 5| between these fuel bunkers, The floor ll of the boiler room is apertured in this alcove and a removable plate 52 is placed over the gear casing 48 whereby, access thereto may be conveniently had'by removing the plate 52.

Fuel falls by gravity from the bunker 49 and thence through the opening 54 in the 11001 H into the open mouthed trough 20. A hood 55 which is hinged with the wall 49 as at 55a surmounts the opening 54 and prevents the fuel from overflowing onto the floor ll. able gate 55 which is normally suspended in its upper position by a hook 51, serves as a closure for the aperture 53.

Whenever it is desirable or necessary to gain access to the interior of the trough 20, the gate 56 is permitted to slide downwardly thereby preventing further admission of fuel into the trough. The stoker is then operated for atime sufficient to empty the trough 20, after which the hood 55 may be raised and the necessary inspection or repair of the trough and the conveying mechanism made. 7 g

If desirable or necessary, the fuel bunker I2a may also be provided with a hinged hood and gate the bunker l2 has become exhausted.

The elevating screw 69 terminates below the upper portion of the tubular extension 65 so that a more or less columnar formation of fuel will be conducted to the delivery mouth 68 of the tubular extension with which common mouth the diverging tube members 66, 6! communicate.

In order that the delivery of the fuel to eac furnace may be effectively controlled, the upper portion of the tubular extension 65 is provided with a counter-bored portion 10, which receives a fuel control 'head'll having an aperture 80 therein which is normally in approximate register with the mouth 68. A portion of the head H is serrated as at 12 to form a segment of a crown gear 13, which is engaged by a crown pinion 14. A rod or shaft 15 carries the pinion l4 and is received in suitable bearings l6, 1'! along the side of the upright elevator casing 24 and the tubular extension 65. By turning the handwheel 18, which is within easy reach of thestoker operator, the pinion 14 will rotate the gear segment 13 and I thus cause the control head H to close off the mouth 68 in any suitable degree depending upon the amount of rotation, thus varying the amounts of fuel delivered to each of the tube members 66, 61. In order that the control head H may be easily moved, the tubular extension is flanged as at 19 to form a race 90 on which rest the rollers such as 8| of the'control head H. In this manner, the control head is supported exteriorly of the tubular extension and is thus easily rotated. ,;;From the foregoing description, it is apparent that a stoker has'been devised which is especially I I2 through the vertical aperture 53 in the side wall" A vertically sliduseful for installation in connection with a boiler having a plurality of furnaces. Furthermore, the

stoker occupies but little space in the boiler room and may be readily controlled by the novel construction of the fuel dividing means. rangement of applicants fuel bunkers in relation with the stoker trough will also prove to be advantageous in that the fuel conveying mechanism is readily accessible for the, purpose of repairs or its respective furnace at a point above the fire grate thereof, said upright elevator including a casing and a tubular extension surmounting said casing and having a fuel delivery opening, a plurality of diverging tube members extending down- The arwardly from and communicating with'the fuel 7 delivery opening of said tubular extension and delivering to respective; fuel distributors, a screw within the casing for elevating fuel through said casingand along said tubular extension and de-' livering fuel into each of said tube members, said screw terminating below the upper portion of said tubular extension, a rotatable control head comprising a cylindric wall mounted within the upper portion of said tubular extension and closely fitting against the inner wall thereof, said headbeing provided with 'anopenin g adapted to register with the discharge opening of said tubular extension, and means for rotating said head to bring the opening therein into register or out of register with the opening in said tubular extension, for controlling the delivery of fuel there-I 4,53 2 In combination-with a boiler having a plufrom.

raliy of furnaces, and a source of fuel supply, a

stoker for feeding fuel to the furnaces comprising a fuel transfer conveyor leading from the source of fuel supply, a single upright elevator receiving fuel from said transfer conveyor and including a tubular extension at its upper end having an aperture therein, a plurality of outwardly and downwardly extending feed devices communicating with said tubular extension through said aperture and leading respectively to said furnaces, a rotatable control head comprising a cylindric wall mounted within the upper portion of said tubular extension and closely fitting against the inner wall thereof, said head being provided with an opening adapted to register with the discharge opening of said tubu lar extension, and means for rotating said head to bring the opening therein'into register or out of register with the opening in said tubular extension, for controlling the delivery of fuel'therefrom. 1

3. In combination with a boiler having a plurality of furnaces, a stoker for feeding'fuel into each of said furnaces, said stoker including a. fuel elevator having a tubular'extension' at'its' upper end provided with an aperturetherein and a plurality of outwardly and downwardly extending feeding devices communicating with said tubular extension through said aperture and leading respectively to said furnaces, a rotatable control head comprising a cylindric wall mounted within the upper portion of said tubular extension and closely fitting against the inner Wall thereof, said head being provided with an opening adapted to register with the aperture of said tubular extension, and means including a gear and segment for rotating said head to bring the opening therein into register orout of register with the aperture of said tubular extension, for controlling the delivery of fuel therefrom.

4. In combination with a boiler having a plurality of furnaces, a source of fuel supply, a stoker for feeding fuel to the furnaces comprising a fuel transfer conveyor leading from the source of fuel supply, an upright conduit receiving fuel from said transfer conveyor and provided near its upper end with an opening in one side, a conveyor screw in said conduit for elevating fuel therethrough, a plurality of tubular casings each communicating at one end with the opening in said upright conduit for receiving fuel therefrom and at the other end communicating with one of said furnaces for delivering fuel thereto, a control head comprising a cylindric wall mounted within the upper portion of said upright conduit and fitting closely against the inner wall thereof, said head being provided with an opening adapted to register with the opening in said upright conduit, and means for rotating said cylindric wall along the inner wall of said upright conduit and across the area of communication between said tubular casings and said upright conduit for controlling the delivery of fuel from said upright conduit intosaid tubular casings. V

WILLIAM H. R. MARSDEN..

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