US1571038A - Soot blower - Google Patents

Description

Jan.

L. J. BAYER soon1 BLOWER Filed May a. 1922 4' Sheets-Sheet 1 illiinlllll!!! Il! 1 4 QI 4 Sheets-Svheet z sooT BLOWER L. J. BAYER Filed May .A 1922 Jan. 426 1926.

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L.. J. BAYER SOOT BLOWER Filed May a, 1922 4 Sheets-Sheet 4 Nn bh QN Patented Jan. 26, 1926.

UNITED STATES LEO JOHN BAYER, 0F ST. LOUIS, MISSOURI.

SOOT BLOWER.

Application filed May S,

To all whom it may concern.'

Be it known that. l, LEO JOHN BAYER, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Scot Blowers, of which the following is a spec1- (ication.

'The present invention relates to improvements in vsoot blowers or boiler cleaners, particularly applicable to the Stirling watertube type of boiler, or other boilers having tubes vertical or substantially so. The soot blower comprises a series of bloweriinits disposed at selected points in the boiler so as to most effectively dislodge soot accumulations, and the respective units are independently operated or controlled, the construction of these units being the subject matter of the present invention.

The principal objects sought by the present improvements are to provide a soot blower unit wherein the operating valve which admits steam from the supply pipe to the blower pipe is actuated directly from the drive-shaft which actuates the revolwing blower pipe; one wherein the valve is controlled so as to remain open during the period that the blower pipe is rotated through its predetermined blowing arc 1rrespective of the direction of rotation of 'the blower pipe; one wherein the operating valve is controlled by a suitable cam which may be readily replaced by a cam of different contour to vary the blowing are of the blower pipe; one having its supply pipe flexibly supported from the boiler wall to allow for contraction and expansion of said sup l i e.

Fliiiitlibii)v objects and advantages of the blower units will be better apparent from a detailed description of the invention in connection with the accompanyingdrawings, in which- Figure 1 represents a side elevation of a- Stirling boiler and setting showing the several 'banks of circulating water-tubes and baiiles, side walls of the setting being removed, and the remaining walls shown in section, and the blower comprising the units of the present improved type being shown in elevation; Fig. 2 is a combined side elevation and section of the lhead end of the. second blower unit, the side wall of the ,setting being .shown in section, and parts being broken away; Fig. 3 is a side elevation of the opposite end of the second blower 1922. Serial No. 559,290.

unit, the side wall of the setting and the tubes being in section; Fig. 4- is an enlarged yiew of a part of the blower pipe and its jacket, partsof two adjacent sections being shown, and part of one section being broken away; F 1g. 5 is ak longitudinal section through the blower pipe and jacket taken along the plane of the nozzles; F ig. 6 is a vertical cross-section taken on the line 6-6 of 4; Fig. 7 is an enlarged vertical longitudinal section through the head of the blower unit; Fig. 8 is a front elevation of the blower head with parts broken away; Fig. ,9 is a vertical cross-section takenon the line 9 9 of Fig. 7; Figures 10 and 11 are enlarged detail views of the valve and actuating mechanism therefor; Fig. 12 is a detached face view of the ring that is inter- V posed between the wall sleeve and supporting bracket of the blower unit; Fig. 13 1s a vertical cross-section taken on the line 13-13 of Fig. 7, and shows the intake end ofthe blower pipe; Fig. 14 is a vertical cross-section taken on the line lik-14 ofV Fig. 7, and shows the intake end of the air jacket; Fig. 15 is a side elevation of the first blower unit, a part being broken away, and parts being shown in section; Fig. 16 is an enlarged vertical cross-section taken on the line 16-16 of Fig. 15; and Figures 17 and 18 are detail views of a modified form of valve actuating mechanism.

Referring to the drawings, F represents the boiler setting, B the lire box, 1, 2, 3, the front, middle, and rear shells for steam-andwater respectively, 4 the mud drum, 5 the front bank of circulating water-tubes connecting the shell 1 with the mud drinn, 6 the middle bank of water-tubes, 7 the rear bank of water-tubes, 8 the steam tribes connecting the front an-d middle shells, 9 the steam tubes connecting the middle and rear shells, 1() the water circulating tribes between the shells 1 and 2, and 11 the tiling or baffle directly over the tubes 10. The front baille 12 carried by the rear members of the front bank of tubes is provided with a shelf 13 at a point below but adjacent to the upper end of thebaiile, the middle baffle 14 disposed along the rear of the middle bank of tubes reaching from the shell 2 to a point near the In the present embodiment ot my invention I provide the middle battle 14 at an intermediate point of its height with a rearwardly projecting shelf 14 above which the fourth blower unit ot the present improvement is installed. The arrows in Fig. 1 rep-- resent the general coui se ofthe tui-nace gases and combustion products, the same traveling from front to rear and making practically tour passes, as clearly apparent from the drawings.

The several blower units herein may be referred to as No. 1, No. 2, No. 3, No. 4, and No. 5, according to their positions in the boiler from tront to back in the line ot iiow of the gases, and vary somewhat in construction, since ilos. 1 and 2, being in the hottest part of the boiler, are'air-cooled, while Nos. 3, 4, and are not subject to such high ten'iperatures, and need not necessarily be provided with cooling means. Then again, blower unit No. 1, located ontne bridge-wall, may or may not be provided with a revolving blower pipe, the blower pipes oi all the other units, however, being revoluble.

Since unit No. 2 embodies all ot the features of the present invention, both for revolving the blower pipe and Jfor cooling the same, this unit will be tirst described. P represents the steam or cleaning-fluid supply pipe, dry steam being the usual liuid employed as well understood in the art.

The boiler side wall F is provided with an opening O below the tubes 10, and a wall sleeve 16 is fitted tightly into this opening, said sleeve having a square flange 16 on the outer end into the corners of which is bolted a supporting bracket 17 `tor the blower head H about to be described. Blower unit o. 2 is provided with a blower pipe 18 supported at the outer end in the head H, said blower pipe being confined in a jacket or air pipe 19 spaced therefrom, the assembled blower pipe and sleeve being supported at suitable points along its length by brackets 2O suspended from the tubes 10. One end of the jacket 19 is open to the atinosphere, terminating in a spider 21 mounted on the blower pipe 18, the openings o between the ribs ot the spider permitting air to enter the jacket ireely and circulate about the blower pipe, linally discharging through a riser to the flue S, said riser being connected by a swivel 23 to the jacket. However, there are other ways of inducing an air circulation through the jacket 19, and do not wish to be restricted to that shown herein. Owing to the great heat in the boiler in the vicinity of unit No. 2, the air circulation through the jacket 19 is of itself insuficient to keep the jacket cool enough to prevent warping. I therefore build the acket 19 in sections a, c., etc., each section being connected (by a sliding t) to the adjacent section by an internal sleeve 24, a slight cleai'- ance X being provided between the sections c to permit ot expansion under heat (Fig ures 4 and 5). By virtue of this construction expansion and contraction of the jacket is compensated for and buckling and warping ot the unitdoes lnot take place, since any tendency in this regard in one section would be counteraeted by another section, and the eiiect could not be cumulative, the sections acting independently.

The jacket 19 is maintained in spaced relation with the blower pipe'18 by radially disposed studs screw-threaded through the sections c into sliding contact with the blower pipe 13, the studs in any one plane being 900 apart and distributed in alineinent and equally spaced along the jacket. Opposite to one row ot studs are the nozzles 26 adapted to discharge steam into the bank of tubes 10, each nozzle being` screw-threaded into the blower pipe 13 and having an intermediate polygonal enlargen'ient 26, the inner surface of which bears against said pipe, and the outer surface of which is contoured to bear snugly against the inside of the jacket 19. The discharge end 26 ot each nozzle projects into an opening t in the jacket, said opening being large enough to provide clearance around the nozzle end 26 to permit ot relative longitudinal movement oi acket and blower pipe, due to expansion and contraction, without shearing ott' the nozzle. The enlargement 26 closes the opening t on the inside.

The blower pipe 13 receives steam through the blower head l-l. which is connected to the supply pipe P by a riser 27, which terminates at the top in an elbow 23.

rThe blower head H comprises the actuating mechanism of the unit, and will now be described, A suitable housing 29 is provide ed with an annular bearing support 30 adjacent tbe open end of the jacket Y19. said support having a boss 31- formed on its up per surface, and a fork 32 projecting down wardly from its lower surface, the :former carrying a stud 33, and the latter forming one member ot a universal joint J. the other member 34 being formed on the upper end of a pin The stud 33 projects upwardly through a laterally disposed slot s `Formed in a lug 36 projecting outwardly from the bracket 17. The pin 35 projects downwardly through an opening u in a lug 36 extending outwardly from said bracket and directly beneaththe lug 36, and a cushion spring 37 is coiled about pin 35 between joint J and the lug 36. By virtue of the universal joint J and the connection ot the slot s and stud 33 the headervI-I is flexibly connected 1o the rigid bracketl?, and is freely movable both vertically and laterally relative to the bracket responsive to expansion and contraction of the riser 27 or other stresses put upon the unit. Consequently any change in the relative positionv of the respective parts of the blower unit due to the trying vconditions under which it must function are compensated for, thus avoiding distortion and strain.

The blower pipe 18 is supported on roller bearings 38 within the bearing support 3 and is provided with a ball-end-thrust bearing 39 confined between the roller bearings and shoulder o in the support 30. Astbe pipe 18 moves in and .out under contraction and expansion the header H moves with it,

yielding to the necessary degree in the bracket 17.

A gear housing /L is connected to the bearing support 30, the front wall .40 of the housing being bolted to it by bolts 5, Z), etc., a stufling box c provided with a packing d, and gland e, adjoining the housing wall. The intake end of the blower pipe 1.8 is surrounded by a casing 41 formed integral with the stuffing box c, said casing having a depending vertical leg 42 and a front cover plate 43 through which extends a pintle 44 carrying a pointer 44 on its front end, the opposite end being screw-threaded over the end of pipe 18. A stuffing box 46 is provided on the outside of the cover plate 43 to prevent steam from leaking out of the casing 41.

A drive shaft 47 is mounted in the outer wall of the hollow leg 42 and housing 7L, traversing the housing wall and inner wall of the leg 42 in which is a stuffing box 48. That part of the shaft 47 within the leg 42 carries a double worm 49 meshing with a worm-wheel 50 freely rotatable on a shaft 51 extending across the leg 42, and the part of the shaft 47 within the housing 7L carries a pinion 52 meshing with a gear wheel 53 within the housing and set-screwed to the blower pipe 18, a pulley 54 being keyed to the. drive shaft between the leg 42 and housing z.. A pair of cams 55, 55 of identical shape are set-screwed (or otherwise secured) to the hubs of the worm-wheel 50, each cam having opposite surfaces m, m of long radius and opposite surfaces n, n of short radius `joined with the surfaces m, m, and a pair of rollers 56, 56, mounted on the top of a valve cage 57 are adapted to ride over the surfaces m, a, of the cams. The lower part of the cage is provided with a valve 58 from which Idepends a stem 59 operable in a. guide 60 formed in the elbow 28 screwed into a flange 61 terminating the leg 42. A valve seat 62 is formed at the base of the fiange 61 on which the valve 58 is normally -seated by the tension of a spring 63 coiled about the valve stem 59 and confined between the guide 60 and valve.

The ratio of pinion 52 to gear 53 is 1 to 5, and the ratio of worm 49 to worm-wheel 50 is 1 to 10, consequently when the shaft 47 is rotated in either direction, by pulling on a chain 64 passed over pulley 54, five revolutions of the pulley will impart one revolution to the blower pipe 18, and one-half revolution to the cams 55. Therefore, when a half revolution, or from low surface n r to opposite surface 1.11, during which halfturn lthe valve 58 will be opened and steam admitted to pipe 18, since the rollers 56 must pass over one high surface m interme diate the two low surfaces n'. The pointer 44 indicates to the operator the position of the nozzles 26 which are in line with the pointer. The steam on entering the blower pipe past the open valve 58 will discharge from the nozzles 2G throughout the period that the valve rollers 56 are riding on the surfaces m. Since a half revolution of the cams is equal to a complete revolution ofthe blowerpipe, a cam surface m equal to a 60 are will permit steam to blow from the nozzles through a 1200 arc of rotation of the blowing pipe. In this case it may be said that the blower has a 120o blowing arc since the supply valve is completely open during thisy period. VOf course, some steam will be discharged from the nozzles during the periodl that the valve is passing from closed to open position, or vice versa, but this is immaterial. units requiring a blowing arc of more or less than 1200, the cams 55 may be replaced by others wherein the surfaces m and n are of the proper length to meet the different requirements.

It will be observed that the pulley 54 may be rotated Y'in either direction for operating the blower since the operating mechanism is constantly in operative condition, and there are no impinging parts or stops such as have heretofore been used on blowers of this general character. This is a very desirable feature since boiler room accessories sometimes encounter pret-ty rough handling. Furthermore all the working parts are encased so that they are protected from dirt o-r other foreign matter. Then, again, the valve being actuated directly from the drive shaft by gearing as is also the pipe 18, the valve and pipe are bound to operate synchronously and positively.

To prevent cold air from entering the boiler between the jacket 19 and sleeve 16, I provide an annular recess r in the bracket 17, and a ring 65 is placed in this recess, said ring having a close sliding fit with the jacket, and a series of spring clips 65 are secured to the ring in spaced relation, said clips maintaining the ring against the wall sleeve 16 and closing the opening about the jacket.

Obviously, for blowerl Blower unit No. 1 (Figures 15 andy 16) likewise being in a very hot part of the boiler, has its blower pipe 18 surrounded by a jacket 19 connected by a riser 66 with the flue S to provide for a circulation o1 air around the blower pipe, but instead of being supported from the boiler tubes the unit is supported in saddles 67 on the bridge-wall IV and in spaced relation thereto to prevent the conduction of heat to the unit from the bridgewvall. In the present instance the unit is stationary (consequently no blower head is necessary) and the blower pipe 18 is connected directly to a short riser 68 in which is a steam supply valve 69 for independently controlling the blowing operation, the riser 68 being connected to the steam supply pipe I). In other respects this unit is the same as No. 2, and if desired may be provided with ai head for rotating the blower pipe.

Units No. 3, No. 4, and No. 5 are similar in all respects to unit No. 2 except that the jacket 19 is dispensed with since these units are more rearward in the boiler, and are not subjected to such excessive heat. However, I reserve the right to provide any of these units with jackets for air circulation if at any time it is desirable.

In Figures 17 and 18 I show a modified form of cam 55 for actuating the valve 5S, said cam comprising a housing 70 mounted on a single worm 71, the housing having teeth 72 formed on its inner surface for end gaging with the worm thread. The worm is volvedin the opposite direction when the operation is repeated.

Obviously the invention is susceptible to other modifications, all of which cannot be described, and I do not Wish to be understood as restricting myself to the construction herein shown.

Having described my invention, I claim:

1. In a soot blower for boilers, the combination with a steam supply pipe terminating at one end in a head, of a peripherally ported blower pipe revolubly supported at one end in the head, a valve in said head for controlling the steam flow from the steam pipe to the blower pipe, a gear wheel fixed on the blower pipe, a drive shaft, a pinion on one end of the drive shaft and meshing with said gear wheel, a worm on the other end of the drive shaft, a worm wheel meshing with said worm, and a cam fixed to the worm wheel for actuating the aforesaid valve on revolving the drive shaft.

2. In combination with a boiler and setting therefor, a soot blower unit comprising a blower pipe, a steam supply pipe therefor, an operating head communicating with the blower pipe and supply pipe, and means for securing the soot blower unit to the boiler wall comprising a wall plate having an opening for receiving the blower pipe, a pair of spaced, vertically alined lugs projecting from said wall plate, and means for iieXibly connecting the operating head to the wall plate comprising a universal joint arranged between the head and the bottom lug and a pin and slot connection between the head and the upper lug.

In testimony whereof I hereunto affix my signature.

Luo JN0. BAYER. y

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