Патент USA US2412193код для вставки
Dec‘ 10’ 1946' I A. o. ANDERSON - - ‘- 2,412,193 FUEL FEEDING APPARATUS Filed Aug. 2a, 1945 ‘ 4 Sheets-Sheet 1 IN VEN TOR. A T TORNEYJ Dec. 10, 1946. 2,412,193 A. O. ANDERSON FUEL FEEDING APPARATUS Filed Aug. 23, 1945 4 Sheets-Sheet 2 INVENTOR. ?c'f/zur Q?ndew‘ou %. 21 aémzfxdaa’w BY AT TOPNE YU' Dec. 10, 1946. A. o. ANDERSON 2,412,193 FUEL FEEDING APPARATUS Filed Aug. 23, 1945 4 Sheets-Sheet 3 IN VEN TOR. ATTOPNE YS Dec. 10, 1946. - A, Q ANDERSON ‘ 2,412,193 FUEL FEEDING APPARATUS Filed Aug. 23, 1945 4 Sheets-Sheet 4 ATTORNEYJ 2,412,193 Patented Dec. 10, 1946 UNITED STATES PATENT OFFICE 2,412,193 FUEL FEEDING APPARATUS Arthur 0. Anderson, Davenport, Iowa Application August 23, 1945, Serial’No. 612,289 7 Claims. (01. 198-213) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) 2 1 The invention described herein may be manu factured and used by or for the Government for itating repair and/or adjustment necessary to as sure smooth and e?icient operation of the fuel governmental purposes, without the payment to feeding mechanism. me of any royalty thereon. Another object of my invention is to furnish a sectioned combination coupling and fuel cham her for the conveyor tube of an automatic stoker The present invention relates generally to the art'of fuel feeding. More particularly, it pro videsfor an improved ‘attachment for a solid which may be opened substantially through 360° fuel feeding apparatus of ,a standard heating furnace which comprises means for speedy and easy access to the interior of the feed mechanism by manual release of a simple locking means. A further object of the present invention is the provision of a modi?ed fuel conveyor tube for an automatic stoker adapted to receive a readily housing. ' > ' ’ Speci?cally, the improved attachment includes a hinged interiorly tapered combination coupling and coal chamber adapted to house the feed removable ?anged coupling and fuel chamber. , An additional and important object of my in vention is the construction of a coupling forthe mechanism of a conventional automatic stoker. conveyor tube of an automatic stoker adapted for The chamber is provided with releasable locking means-and may be opened for exposing said feed mechanism through 360° by manual manipula compression of the fuel into the grooves of the fuel feeding means substantially entirely within the coupling. . A still further object .of my invention is the In the past in connection with the operation 20 provision of a combination coupling and fuel chamber adapted for installation into existing of solid fuel stokers, especially with the under’~ stoker assemblies with relatively few alterations feed type, it occasionally has been found that a to the existing plant. relatively-large piece of steel or other hard ma tion of the locking means. , ' Preferred embodiments of my invention where terial has become mixed with coal in the bin or hopper in which it was contained in such a man~ 25 by I attain the above and other and further ob her that the foreign matter has been fed along with the coal into the feeding tube where it some times came in contact with the fuel feeding mechanism and became wedged between the fuel feeding mechanism and the tube housing it, in such a manner. as to stop rotation of said fuel feeding mechanism. When this occurs a shear pin normally employed in the fuel feed drive shaft is broken, thereby severing the connection between, the prime mover and the drive shaft. In such a contingency, it is usually necessary to shovel all of the coal away from the fuel outlet in the bin, when such a receptacle is used for the fuel, and to employ a lever arm or other tool for manually reversing rotation of the torque screw or other feeding means to disengage the steel or other foreign object. In cases where a hopper is used it is usually necessary to completely un load the hopper in order to gain access to the in jects are illustrated in the accompanying draw ings in which like numerals refer to like parts throughout the several views and wherein: Fig. 1 is a schematic layout showing one form or arrangement of a solid fuel bin or hopper, a fuel feeding tube, a furnace and the attachment constituting the improvement of the present in vention; Fig. 2 is a perspective view illustrating the 35 means of application of the fuel chamber vcou pling to the conveyor tube of a stoker and shows one form of lockingmeans used to retain the coupling member in locked relationship relative to said conveyor tube; , v Fig. 3 is a side elevation, partly in section, showing the interiorly tapered coupling member and the manner in which it is attached to the conveyor tube of a stoker; Fig. 4 is an end view .of the hinged coupling terior of the housing of the fuel feeding mech 45 device in opened position; Fig. 5 is an end view of the coupling device anism. After removal of a foreign body a new of Fig. 4 showing the device in closed and locked shear ,pin may be inserted in the driving shaft, position; . the hopper reloaded and the stoker again placed. in operation. ' Fig. 6 is a view of the conveyor and’fuel feed Obviously the above described process is an in 50 tubes of a stoker with the hinged coupling mem eillcient and time-consuming repair job. Ac cordingly, one-of theobjects of the present in vention istheiconstruction of a device providing ber completely removed; - Fig. 7 is a view similar to Fig. 6 but showing the hinged coupling secured tothe fuel feed and conveyor tubes; and ing- mechanism of ‘an automatic stoker for facil 55. Fig. 8 illustrates an alternative construction convenient and speedy access to the fuel'feede 2,412,193 3 a bin or hopper for solid fuel. 4 tially U-shaped dog 24 formed integral with for locking the hinged sections of the coupling chamber. Referring to Fig. 1, the numeral l designates the body portion of the other section i2 of the chamber 1. The dogs 22 and 24 may be rein forced in their connections to the collars i5 and A relatively (6 respectively as by means of inclined ?anges or ribs 25 and 26 as shown in Fig. 2. The two short cylindrical fuel feeding tube 2 is connected to the bin and has secured thereto the improved attachment designated generally by the refer ence numeral 3 constituting the present inven sections. ii‘ and i2 of the coupling chamber 1 are adapted- to be releasably locked by manipu lation of a handle 21 positioned adjacent one tion as hereinafter described. The numeral 4 indicates a conventional furnace. The fuel bin 10 end of the locking member 23 and extending therethrough, the locking member being adapted I is provided with a generally circular fuel outlet for projection against the washer 3i by the co to which is connected the fuel feeding tube 2 as operation of. its interiorly threaded portion with by means of an annular ?ange member 5 adapt the threaded part of the bolt 20. ed to be secured to the fuel bin l by means of The coupling chamber 1 may be further se any suitable fastening means'such as bolts passed 15 cured against rotation relative to the ribs I8 and through apertures 8 formed in the annular ?ange i9 by means of a pair of dowel pins 28 adapted member. The attachment 3 comprises a combi to- pin the collars l5 and I6 respectively to the nation coupling and fuel chamber 1 which is‘ annular flanges I8 and ill by means of a slot in adapted to form a connection between the free end of the fuel tube 2 and a fuel conveyor tube 20 each of the latter, as shown at 29 in Fig. 2. The pin 28- is. preferably made of soft. steel and. may 8 and also to house fuel feeding mechanism be inserted at any convenient point toss curev the such as a torque screw or worm 8 (Fig. 2).. The desired result. This pin is. preferably substan conveyor tube 8 is of smaller diameter than the tially equal in strength to the shear pin usually tube 2, for a reason which will hereinafter be employed in stokers to break‘ the connection. be come apparent. 25 tween the prime mover and the fuel feed drive The member '1, preferably made of cast iron, shaft in emergencies whichv may arise ‘through is generally similar to the hollow frustum of a conefand is interiorly tapered as at ill. (Fig. 3). The inside diameter of the fuel chamber 1 at the end of the taper l0- adiacent the entrance to the conveyor tube 8 preferably is slightly less than the inside diameter of the latter. With this construction any impediment to continued operation of the feeding means whichv may be contained in. the fuel being fed by the worm 9 35 will be trapped in the chamber 1 without being malfunctioning of the fuel feeding mechanism. through failure of the screw or‘ worm carrying shaft to rotate due to an‘ obstruction in the fuel to be fed or otherwise, as is well understood in the art. It will be-evident'that by reason of‘ the tapering of the chamber solid‘ fuel- fed into the interior thereof will lie-‘compressed into the spiral grooves of the feed screw 9‘ substantially entirely within the chamber. Consequently if there is any foreign object mixed- with ‘the fuel‘ it. will; be passed on to the tube 8 where it would be dif flcult to retrieve it. The inside surface of the chamber 1 may be either smooth or ribbed. The chamberimay consist of- two or more substantial 40 engaged, if at all, between the feed screw and its surrounding enclosure at some point within the feeding chamber. Thus should lube-neces ly identical sections (twoin the present instance) indicated by numerals Ill and fiend hingedl-y continuous operation of? the fuel feeding screw sary to remove any obstruction affecting smooth ‘ it can be easily and quickly accomplished-by connected as at l3 by means of a-pintie- M. releasing the locking'bolt 2a, disengagingyit from Eachof'these sections is provided‘ with twosemi the dogs. 22 and 24- and removing the‘ hinged chamber ‘I entirely as shown in Fig. 6’. circular collar elements I! and “positioned at - opposite ends'of the chamber. These‘ collar ele Fig. 8 shows2 a. modified form of attachment ments are g-rooved on. their inner peripheries in the manner indicated‘at i'i'in Fig. 3', which con designated by the numeral 1a and having all’the characteristics- of the attachment ‘I except-that twolocking bolts and four dogs are-employed; Corresponding similar parts are- designated by corresponding reference characters to- which the struction adapts them for cooperation with chamfered annular ?anges. or ribs i-?- and i8 formed respectively at one end ‘of- the fuel feed tube 2 and the conveyor tube 8 for securing the coupling in position and for preventing axial displacement thereof. As shown most clearly- in Figs. 2, 3-,..and '6 the flange 18 is formed on-the' , end-of! an adapter member 80- ‘having its other end formed-as asleeve-fitting around the outside of'the open end of tubes and‘ secured thereto by exponent “ai'hasf-been added; _ As previously mentioned-one of the important features of my invention resides in the ease and simplicity with which it~ may be- incorporated into known‘ types of fuel feeding assemblies’ with but slight modifications to the existing plant; For example, a typical ‘installation prior to-mod any suitable means such as welding. Various devices for ‘maintaining the hinged 60 ification to incorporate ‘my improved coupling will bear-ranged in- such manner thatthe- tube- 8 sections it and i 2 ‘of theschamber 1" in locked relation. relative to eachother may be employed. is constructed as a continuous single member having enlargedv flange means secured to its end Figs. 1-5 and 7 show one form of the locking adapted for fastening directly tothe-hopper I-'. It ‘device and Fig. 8 shows an alternativev form is- accordingly only- necessary in-such cases tore which I have chosen to illustrate and describe move the‘ enlarged ?ange and? substitute my herein. double ?anged cylindrical member 2 therefor; "The device shown in Figs. 1-5 and 7 comprises sever a short section from‘ the tube Elfand se a bolt 20 'pivotally connected at one end» as'by means-of 1a pin’ '21- to a substantially U<shaped deg'zz which 'may be formed integralfwith the body portion of the section H of the coupling chamber 'l'-.- The bolt 20 is threaded at one end and is adapted to- receive a complementary in teriorly threaded tubular locking member 23‘-and a-washer M and vto ?t intova second substan 70 cure the adapter ?ange 30 in place on the-sev cred; end of. tube 8. _"I~‘he assemblyv will then ‘be in- the condition illustrated in Fig. ‘6 in readi uses to- receive my improved‘ coupling device '3 which may then be fitted‘ over the flanges‘ l8 and‘ i8‘ and securely ‘but i-eleasesblyv melted in 75 place by-the-bolt- 20f andlshear pins-28. his-‘there 2,412,193 5 are many known types of stoker assemblies the details may vary‘ slightly according to the dif ferent modi?cations encountered but in each case the alterations necessary will be of a rela tively minor character and extent. Although I have illustrated and described herein only preferred embodiments of my cou pling chamber, it is obvious that others of many types and variably positioned, could be used de pending upon the length of the fuel feed tube and -of the conveyor tube. Also my invention is adapted among other things for use in overfeed. underfeed and central feed stokers and it is not therefore my intention to be limited to the un derfeed type illustrated. . Many alterations and modi?cations of the present invention will no doubt occur to those skilled in the art and I do not therefore desire 6 of said‘ fuel-feeding‘ mechanism between the ribbed ends of said tubes and to compress fuel between the walls of said chamber and said fuel feeding mechanism substantially entirely-within said chamber, means for hingedly connecting said sections whereby they may be opened and closed through 360° about the aforesaid portion of said fuel-feeding mechanism, releasable latch means for releasably looking said sections in closed posi tion, a pair of complementary collar elements at each end of said fuel chamber sections, means forming a groove on the interior of each said collar elements, each pair of said collar elements being adapted respectively to encircle the ribbed ends of said tubes with said grooves embracing said ribs for substantially preventing axial dis placement of said fuel chamber sections relative to said tubes, and means for confining said fuel chamber against rotation relative to said tubes. to be restricted by the precise disclosure made 3. In a stoker for feeding solid fuel from a fuel herein. Accordingly it is my intention to be lim 20 source to a furnace, a fuel inlet tube, means for ited only by the prior art and the appended connecting one end of said fuel inlet tube to said claims. fuel source, an annular rib on the other end of I claim: said fuel inlet tube, a fuel conveyor tube, one end 1. In a stoker for feeding solid fuel from a of which is adapted to be connected to a fur 25 fuel source to a furnace, a fuel inlet tube, means nace, an annular rib on the other end of said for connecting one end of- said fuel inlet tube to conveyor tube, said ribbed ends of said inlet and said fuel source, an annular rib on the other end conveyor tubes being coaxially spaced apart, fuel of said fuel inlet tube, a fuel conveyor tube, one feeding mechanism housed by said tubes but ex end of which is adapted to be connected to a pose-d at the spaced apart ribbed ends of said furnace, an annular rib on the other end of 30 tubes, an interiorly tapered fuel chamber inter-' said conveyor tube, said ribbed ends of said in posed between the ribbed ends of said tubes, said let and conveyor tubes being coaxially spaced apart, fuel-feeding mechanism housed by said tubes but exposed at the spaced apart ribbed ends of said tubes, an interiorly tapered fuel chamber interposed between the ribbed ends of said tubes and having ?rst and second separable sections, said fuel chamber being adapted to house that portion of said fuel-feeding mecha fuel chamber being adapted to house that por tion of said fuel-feeding mechanism between the ribbed ends of said tubes and to compress fuel between the walls of said chamber and said fuel feeding mechanism substantially entirely within said chamber, means providing for interior access to said chamber to expose a portion of said fuel feeding mechanism between the ribbed ends of nism between the ribbed ends of said tubes and 40 said tubes, a pair of collar elements respectively to compress fuel between the walls of said cham at opposite ends of said fuel chamber, means ber and said fuel-feeding mechanism substan forming a groove on the interior of each of said tially entirely within said chamber, means for collar elements, said collar elements being adapt hingedly connecting said sections whereby they ed respectively to encircle the ribbedends' of said may be opened and closed through 360° about -pa Ll tubes with said grooves embracing said ribs for the aforesaid portion of said fuel-feeding mech substantially preventing axial displacement of anism, keeper means on each of said sections, said fuel'chamber sections relative to said tubes, releasable latch means cooperable with said and means for con?ning said fuel chamber keeper means for releasably locking said sections against rotation relative to said tubes. in closed position, a pair of complementary coi 4. An attachment for a stoker adapted to be lar elements at each end of said fuel chamber releasably secured to a fuel conveyor tube of said sections, means forming a groove on the interior stoker, said attachment constituting a housing of each of said collar elements, each pair of said for a portion of the fuel feeding mechanism of collar elements being adapted respectively to en the stoker and comprising a fuel chamber having circle the ribbed ends of said tubes with said ' ?rst and second separable sections, means for grooves embracing said ribs for substantially substantially preventing axial displacement of preventing axial displacement of said fuel cham said sections relative to said fuel conveyor tube, ber sections relative to said tubes, and means for means for hingedly connecting said sections con?ning said fuel chamber against rotation whereby they may be opened and closed relative 60 relative to said tubes. to each other for exposing a portion of said fuel 2. In a stoker for feeding solid fuel from a fuel feeding mechanism through 360°, keeper means source to a furnace, a fuel inlet tube, means for on each of said sections and latch means co connecting one end of said fuel inlet tube to said operable with said keeper means for releasably fuel source, an annular rib on the other end of . locking said sections relative to each other. said fuel inlet tube, a fuel conveyor tube, one 5. An appliance for an automatic stoker adapt end of which is adapted to be connected to a ed to feed fuel to a furnace from a fuel source furnace, an annular rib on the other end of said by means of fuel feeding mechsnism housed in conveyor tube, said ribbed ends of said inlet and a conveyor tube, said appliance constituting a conveyor tubes being coaxially spaced apart, for a portion of the fuel feeding mecha fuel-feeding mechanism housed by said tubes but 70 housing nism and comprising an interiorly tapered fuel exposed at the spaced apart ribbed ends of said tubes, an interiorly tapered fuel chamber inter posed between the ribbed ends of said tubes and having first and second separable sections, said fuel chamber being adapted to house that portion 76 chamber, means for connecting one end of said chamber to said conveyor tube and coaxially therewith, means for connecting the other end of said chamber to a fuel inlet tube, said chamber 2,412,198 7 being adapted to compress fuel between the‘ walls thereof and the fuel conveyor means substantially entirely within said chamber, and means for dis 8 fuel fed therethrough between the walls thereof and the fuel feeding means substantially entire 1r. within said chamber. '7. A device for a stoker adapted to be releas connecting said fuel chamber from the conveyor secured at one end to a fuel conveyor tube tube and the fuel inlet tube for exposing 'the 5 ably in said stoker, and at its other end to a fuel aforesaid chamber housed portion of the fuel inlet tube from a fuel source, said device consti feeding mechanism through 360'. tuting a housing for a portion of the fuel feed 6. In combination, in a stoker for feeding solid fuel from a fuel source to a furnace and having fuel feeding mechanism, an interiorly tapered fuel chamber having means for access to the in terior thereof and adapted to house a portion of said fuel feeding mechanism, means for connect ing said fuel chamber to said fuel source, means for connecting said fuel chamber to said furnace, said tapered chamber being adapted to compress mechanism of said stoker and comprising a ta pered fuel chamber having at least two sections adapted to be opened and closed relative‘ to’ each other, and means including the aforesaid sections for disconnecting said fuel chamber from said conveyor tube and said fuel inlet tube for ex-' posing said fuel feeding mechanism through 360°. ARTHUR O. ANDERSON.