US2262079A - Stoker apparatus - Google Patents

Description

Nov. 11,1941. F.- D. YARlcK l 2,262,079

STOKER APPARATUS Nov. 1l, 1941. F. D. YARICK STOKER APPARATUS 2 sheets-sheet 2 Filed July 22, 1959' Ctforneg Patented Nov. 11, 1941 'UNITED STATES PATENT OFFICE sToKER APPARATUS moya D. Yarick, Detroit, Mich.

Application July 22, 1939, Serial No. 286,021 Claims. (o1. 11o-'45) This invention relates generally to heating apparatus and more particularly to fuel stoker apparatus.

One of the objects of the present invention is to provide a new and improved fuel stoker apparatus in which coking of the fuel is substantially eliminated.

Another object of the invention resides in the provision of a novel agitator means for preventing coking of the fuel.

Another object of the invention is to provide a fuel stoker apparatus in which fuel combustion is improved in a manner such that coking masses of fuel will be broken.

Other objects of the invention will become apparent from the following detailed description taken with the accompanying drawings in which Figure 1 is a side view partly broken away and in section of my stoker apparatus;

Fig. 2 is a top plan View partly broken away and in section of the stoker apparatus, and

Fig. 3 is a view in cross section of the apparatus taken along the line and in vthe direction of the arrows 3 3 of Fig. 1.

Referring to the drawings by characters of refence, the fuel stoker apparatus includes a fuel retort which, in the present instance, is sectionally constructed having a base I0 and a removable top I I which may be secured to the base by bolts or by any other suitable means. provided with a horizontally extending duct I2 providing an entrance passage I3 for fuel which, 1in the present Stoker, is drawn or pulled into the retort by a screw-feed I4 driven by an electric motor I5. The fuel passage I3 opens into a `vertical passage I6 formed by an upstanding continuous wall I1, cast integral with the base and on the upper open end of which the burner top Il seats. The base I0, wall l1 and the top II cooperate to form an air chamber I8 which surrounds the passage I6. On the shaft I9 of the screw I4 and beyond the opening I6, are provided threads 20 which are reversed from and opposed to other threads of the screw whereby to force fuel up the retort passage I6.

On opposite sides of the feed screw are air inlets 22 which lead into the retort air chamber I8 whence air egresses through ports 23 to the nre, the ports 23 being provided as slots in the upper edge of the retort wall I2 and the screwthread 20 terminates in a disc 24h which serves to Close passage I3 to the air. Air is supplied to the retort by a blower 24, driven by the electric motor I5, the inlet, as at 24a of the blower being at all times open and the outlet of the blower being The base I0 isl connected by connected together ducts 25, 26 and 21 to the retort inlets 22. The duct 25 is a Y-shaped duct having one branch, as at 28, connected to the casing of the motor l5 and partly housing the screw-shaft I9 which extends therethrough to the motor. In the duct 25 there is a damper 30 which is actuated by a heat motor 29 which may be controlled by a thermostat (not shown), the heat motor 29 serving to effect a delayed and slow opening of the damper to give the feed screw time to build up the fire bed before the full capacity of the blower is utilized so as to avoid extinguishment of a low lire by the blower.

In order to prevent coking in the retort, I pro'- vide an agitator 3I for the fuel in the retort, the agitator also being arranged and adapted to direct a stream of air on the fuel slightly above the retort top to increase combustion in a vertical plane and at a level where there is a tendency of coking of the fuel. The agitator 3| is an upstanding tube secured at its lower end within the retort fuel passage I6 to one end of a hollow horizontal shaft 32 which is journaled in a bore in the retort. The shaft 32 extends externally of the retort to and through a casing 34 having aligned hollow bosses 35, 36 receiving the shaft, the hollow boss 35 also receiving the open end of a tube 31, the other end of which is securedA in and to the wall of the duct 25 between the damper 3l) and the blower outlet. Within the duct 25, a funnel 38 is secured to the tube 31 and the large end of the funnel faces the outlet of the blower for increasing flow through the hollow shaft 32 to the agitator tube 3l.

The screw shaft I9 is rotatably mounted in aligned bores in the casing 34 and fixed to the shaft within the casing is a gear 40 which meshes with a gear 4I rotatably mounted on a stub shaft 42. A link 43 is pivotally connected at one end thereof to and offset from the center of the upper gear 4I, the other end of the link 43 being pivotally connected to a crank 44 which is secured on the hollow shaft 32, within the casing 34.

In operation fuel is fed up through the retort passage I6 by the screw I4 and air is supplied to the retort by the blower 24 to maintain and increase combustion. Air also enters the funnel 38 and passing through the hollow shaft 32 is discharged from the upper end of the agitator tube 3| to the fuel. At the upper end or top of the retort there is a tendency of the fuel to coke but if this occurs in the present retort the agitator mechanically breaks up the mass and, in addition the jet of air issuing from tube 3| increases combustion, causing the mass of fuel tending to coke to be cut into with the result that the fuel settles down in the retort. Driven from the screw shaft I9, the link 43 and crank 44 rotate the hollow shaft 22 first in one direction and then in the other giving a back and forth or oscillating movement to the agitator. When energized, the heat motor 30 effects a delayed and slow opening of the damper 30, but air flows to and from the agitator tube 3l either by forced draft when the blower is in operation or by natural draft when the blower is stopped by reason of the tube 31 being connected to the duct 25 rearwardly of the damper 30 or between the damper and the blower outlet.

While I have shown and described my invention in detail it is to be understood that the Same is to be limited only by the appended claims for many changes may be made without departing from the spirit and `scope of the invention.

l, In a s tolerapparatus, a retorthavinga substantially vertical passage for fuel and having adjacent the topv thereof, a plurality of inwardly directed air outlets, a blower, duct means connecting said retort to the outlet of said blower, an automatically operable damper controlling flow through said duct, a casing between said retort and said blower, a hollow shaft rotatably mounted in said casing and having one end projecting into the retort passage, said hollow shaft having an upturned end portion in said passage provided with an air outlet, means within said casing operable to drive said shaft to oscillate said end portion, and a tube connecting said shaft to said duct means between said damper and the blower outlet.

2. In a stolzer apparatus, a retort having a substantially vertical passage for fuel and having an air outlet, a blower, duct means connecting said retort to the outlet of said blower, supporting means between said blower and said retort, ja hollow shaft rotatably mounted in said supportfing means and having one end projecting into the ret'ort passage, said hollow shaft having an upturned end portion in said passage provided with an air outlet, means operable to drive said shaft, damper means in and controlling flow through said duct means, and means communicatively connecting said hollow shaft to said blower outlet anteriorly to said damper means.

3. In a stoker apparatus, a retort having a substantially vertical passage for fuel and having adjacent the top thereof a plurality of air outlets, a blower, duct means connecting said retort to the outlet of said blower, a damper controlling flow through said duct means, a casing between said blower and said retort, a hollow shaft rotatably mounted in said casing and having one 'end projecting into the retort passage, said hollow shaft having an upturned end portion in said passage provided with an air outlet, means within said casing operable to drive said shaft and oscillate said upturned end portion, and means communicatively connecting said shaft to said duct means anteriorly to said damper.

4, In a fuel stoker apparatus, a fuel retort, means providing an air chamber associated with said retort for supply of air to 'the flre a. blower, duct means connecting said air chamber to the outlet of said blower, a damper controlling flow through said duct means, an upwardly directed fuel agitator member within said retort and having an air passage therethrough for discharge of air to the fire, means operable to oscillate said agitator member, and means communicatively f connecting said agitator member to said duct means anteriorly -to said damper. l

5. In a fuel stoker apparatus, a fuel retort having a burner top land-having a lower fuel inlet,

a shaft `projecting into said retort through the side lthereof `above said fuel inlet and Iat a substantial depth below said burner -top and the top extending upwardly -above said burner top.

FLOYD D. YARICK.

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