US1665625A - Soot and sifting ejector for boilers - Google Patents

Description

April 10, 1928.

C. L. DAVIDSON SOOT AND SIFTING EJECTOR FOR BOILERS Filed Dec, 50. 1922 2 Sheets-She. 1

INVENTOR BY ATTORNEY S April 10, 1928.

C. L. DAVIDSON SOOT AND SIFTING EJECTOR FOR BOILERS GOQQQOOOGZ Filed Dec. 50. 1922 r-l 2 Sheets-Sheet 2- (MML INVENTOR more fully hereinafter. -v 5;;

The invention consists substantiallj in the Patented Apr. 10,1928.

UNITED srAres GHABLESL. DAVIDSON, OF YORK, 1LT.

soor aim srr'rrnc EJ'EGTOR FOR BoILEns.

Application filed December 30, 1922. Serial No. 609,799.

This invention relates to means for eject-= mg-dirt, ash, siftings, etc., from boilers, or from the casings of oiler furnaces.

means which are simple and efficient for ejecting accumulations of soot, ash, siftings, dirt, etc, which'collect in furnace chambers.

A further object of the invention is to provide an ejecting mechanism of the nature and character referred to which is simple and efficient in operation, and is controllable to accomplish the removal of deposits or accumulations of soot, dust, dirt, siftings, ashes, and the like, throughout a consider able area. Other objects of'the invention will, app 7 construction, combination, location, and relative arrangement of parts, all as will be more fully hereinafter set forth, as shown in the accompanying drawings, and finally pointed out in the appended claims. Referring to the accompanying drawings: Fig. 1 is a view partly in elevation, partly in section, showing one type of boiler setting and furnace chamber, and theapplication thereto of an ejecting mechanism, embodying the principles of my invention.

Fig. 2 is a view in elevation, parts broken out, and parts broken off, and in section, "or

an ejector mechanism embodying my inven-- tion.

Fig. 3 is a plan view of a ejecting mechanism.

Fig. 4 is a broken view in longitudinal section of the 1 ortion of ejecting mechanism shown in ig. 3. I

Fig. 5 is a view in transverse section on line 5, 5, Fig. 2, looking in the direction of the arrows.

Fig. 6 is a view similar to Fi 5 on theline 6, 6, Fig. 2, looking-in the irection of portion of the the arrows.

Fig. 7 is abroken detail view in elevation of means for controlling the ejecting mecbamsm.

Fig. 8 is a top plan view of the same.

Fig. 9 is a view similar to Fig. 3 showing a slightly modified arrangement embodying my invention.

The same part is designated by the same reference numeral wherever it occurs throughout the several views.

In the use of boilers, accumulations of soot, unburned particles of carbon, and other products of unconsumed fuel, collect, or are deposited upon the boiler tubes, and other I portions of the interior surface of the fur- The ob ect of the invention is to provide nacechamber, fire walls," etc. Various-devices have been employedfor the purpose of removing these deposits and accumulations.

been proposed and used for the pur ose of detaching the accumulations from. t e surfaces of the tubes. In the use of such dee vices the accumulations which are removed from the boiler tubesand other surfaces of the setting become deposited usually at the rear of the boiler, gradually building up a -soot bed around the rear ends of the tubes,

which inetime clogs the draft of the furnace. Such accumulated de osits have necessitated in most" types of oiler furnaces access to the rear of the boiler tubes to enable the "bed' of accumulated material to be- ,scraped out and removed from the tube approximately from 5,000 to 13,000 B. t. u.

per pound; The loss and waste of this heat value becomes an important item of fuel economy. It is among the special purposes of my present invention to provide an ejector mechanism which is simple in structure, eflicient in operation, andwhich is readily and easily ap lied to any of the modern types of steam oiler furnaces for ejecting the accumulations of deposited or detached soot and other unburned particles of fuel, siftings, and theli ke, from their point of accumulation, and delivering the same into the firebed for consumption and utilization of their heat values.

In my pendin application, Serial No. 332,270, filed Octo er 21, 1919-, I have shown, described and claimed a structure of ejector mechanism directed towards the objects and purposes above noted, but in said structure theejecting application or operation is localized at certain points, only of the system. It is among the spec al purposes of present invention to provlde an apparatus-which is controllable and progressive in its action throughout the entire area or space in which the deposits and accumulations take place.

In accordance with my resent mvention,

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I propose to dispose within the area where such accumulations of. soot, unburned particles of fuel, and the like, collect, tubular members 'telescoped the one over the other, and relatively revoluble with respect to each other, and having openings which are brought into register with each other successively and progressively from end to end of the telescoping members as said members are rotatively moved with respect to each other. By imposing an ejecting force within said tubular members, either vacuum or ressure, and within a delivery connection t erefrom, I am enabled to quickly and eificiently and progressively eject such accumulationsthroughout the entire area or space controlled by the mechanism. Through the delivery connection from the tubular members the accumulations are delivered into the fire chamber of the boiler furnace where they may be again ignited and the heat values thereof utilized.

In the drawings I have shown various structures embodying'the principles ofi my invention. Referring particularly to Fig. 1, 10 designates the boiler tubes of a boiler furnace, which may be arrangedwithin the boiler setting in any suitable, convenient, or

well known manner, and in proper relation to the fire chamber 11, according to well known types of boiler furnaces. In the type shown, the boiler tubes 10 are disposed at a downward inclination through and from the furnace chamber 11. In the operation of a boiler furnace of this ty e" soot and other unburned. particles of fue accumulate within the chamber orspace 12 outsideof the 'fire wall 13 of the boiler setting and beneath the lower ends of the boiler tubes. Such accumulations of soot and other deposits occur in this chamber or space 12 either from the action of the natural or forced draft, or

' from the action of steam or air jets applied to remove deposits of soot and the like from the boiler tubes, or from mechanical scraping devices sometimes employed for this purpose.

' Within this chamber 12'Iarrange an ejeceating with the tor device having a deliver connection 14 delivering as at 15 into the urnace chamber 11. Cooperating with the delivery connection 14 is a pipe connection 16 for delivery of air, steam, or other ejecting power force,

in the operation of which an ejecting action .in one of the tublar members in a straigfit line parallel with the axis of said member, and the opening or openings in the other of the tubular members 1n aspiral extending from end to end of said. member, it will be seen that the. openingsin the two tubular members are'brought into register with each other progessively from end to end as the one or the other of the tubular members is axially rotated. It is immaterial in which member the spiral opening or openings 1s may be employed without departure from the spirit and scope of my invention, for example, in Fig. 9 I have shown the outer tubular member formed with a straight slot or opening 21 extending from end to end thereof, while the inner tubular member is formed with a successive series of straight slots 22, arranged in staggered or successively ofl'set relation with respect to each other.

When a suction force is applied to the bores of the telescoping tubular members, it will be seen that any soot or accumulation lying adjacent to any registering openings 19, 20, or 21, 22, will be drawn into the bore of the tubes and through the discharge connection 14 and delivered through the portion 15 into the furnace chamber, such ejection-and de- IOU livery action being localized at the point where the openings 19, 20, register with each other. Now, by rotatively moving one of the tubular members,'thispoint of localization of the suction action will pro ress from end to end of the telescoping tubes as the rotative movement continues to bring successive portions or openings of the two tubes into register with each other. Asshown in Figs. 2 and 5, the register of the openings in the two tubular members occurs at approximately the midlength of the tubes. Now, by reason of the spiral arrangement and relation of the opening or openings in one of the tubes, in this case, the outer-tube, the rotation of said tube causes the point of register, and hence of the localization of the ejecting action, to progress towards one end or the other. of the tubes accordin .to the direction of rotation imparted'to t e tube. From the foregoing description it will be seen that I am enabled to secure a wide range of ejecting action, in fact, substantially throughout the area or space within which accumulations and deposits ordinarily occur.

The tubular members 17, 18, or one of them, maybe rotatively actuated in any suitable or convenient manner, to control mamas the range of ejecting action secured from apoint outside the setting of the boiler. In Figs. 2, 7 and 8 I haveshown one arrangement wherein a worm wheel 23 is mounted upon the end of the tubular member 17-. With this worm wheel meshes a worm gear 24 carried by a shaft 25,-which may be easily rotated by hand. The shaft 25 is journaled within a suitable bracket 26 mounted upon the end of the casin 27 within which the end of the tube 17 is 1ournaled.

In Figs. 1 and 9 I have shown a ratchet wheel 28 mounted upon the outer tubular member arranged to be engaged by a pawl 29 carried by a hand lever 30 pivotally mounted upon "the journal casin 27. Of course, it will be understood t at other forms of. rotating mechanism may be employed for rotatively actuating one or the other of the tubes The arrangements shown, however, are simple and efficient and economical to construct, install and maintain. By reference to Fig. 1, it will be seen that the means for rotatively actuating the tubular member are. located outside of the boiler furnace setting, and hence in convenient position for proper and suitable manipulation. It is obvious that an ejectin mechanism of the nature referred to may he employed in connection with any standard type. of boiler furnace and may be used in connection with any method or form employed for dislodging the accumulations of soot and other deposits from boiler tubes and is equally effective for use where no special means are employed for the removal of accumulations of soot deposits from the tubes.

Of course it will be understood that the worm gear structure for rotating one of the tubular members is employed where the end of the tubular member is not conveniently accessible. Where such accessibility exists the simpler and more economical pawl and ratchet arrangement would be preferable.

2. A boiler furnace having a fire chamber and a soot collecting chamber, in combination with a suction device disposed in the soot collectingchamber and delivering into the fire chamber, said suction device having openings along a portion of its length, means to create a suction in said suction device, and means to progressively uncover and successively cover the openings in the suction device.

3. A boiler furnace having a fire chamber and a soot collecting, chamber, in combination with a hollow member disposed in said collecting chamber and having openings along its length, a delivery connection from said member into the fire chamber, means to create an ejecting force in said delivery connection and to produce a flow of gases into and through said hollow member, and means to progressively uncover and successively cover the openings along the length of said hollow member. I V

In testimony whereof I have hereunto set my hand on this 27th day of December CHARLES L. DAVIDSON.

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