US1995132A - Boiler cleaner - Google Patents

Description

March 19, 1935. N. 1.7 SNOW BOILER CLEANER Original Filed Jan. 24, 1930 4 Sheets-Sheet 1 r v J QM ATTORNEYS Now OILER CLEANER March 1935,

' heets-Sheet 2 Original Filed Jan. 24, 1950 ATTORNEYS I .March 19, 1935. N. l SNOW BOILER CLEANER 4 Shets-Sheet 3 INVENTOR A arman 4. 0

ATTORN EY$ Original Filed Jan. 24, 1930 March 19, 1935. SNOW 1,995,132

BOILER CLEANER V Original Filed Jan. 24, 1930 4 Sheets-Sheet 4 INVENTOR A a/ma/r 6. 5/10 ATTORNEY:

Patented Mar. 19, 1935 g 1,995

imirso STA E-s PATENT t1 3} Norman L. Snow, New'Ca'naan, 001111., assignor III to Diamond Power Specialty Corporation, Detroit, Mich, acorporation of Michigan Application January 24, 1930, Serial Nana-313a Renewed JanuaryZG, 1934 i a i This invention relates to boiler cleaners and has particular reference to a boiler cleaner of the type in which a blower element discharges cleaning fluid adjacent the portions of to be cleaned.

One of the objects of this invention is to provide a boiler cleaner of the above mentioned the boiler character in which the cleaning fluid may be dis-- charged in the form ofa' relatively large and powerful jet adapted to thoroughly clean the surfacesfaces'may be var-iedto effect 'a cleaning of spaced portions of the boiler.

Other objects and advantages of the invention will become more apparent as the following description proceeds, particularly when'reference' is had to the accompanying drawings wherein Figure 1 is asemi-diagrammatic sectional view through a boiler showing a blower element constructed in accordance with the teachings of this invention associated with the same.

Figure 2 is a fragmentary sectional View through the blower element shown in Figure l.

Figure 3 is a sectional view taken on the "line 3--3 of Figure l. t I

Figure 4 is a sectional view through an operating mechanism adapted to be associated with the blower element shown in Figure l.

Fig. 4A is an enlarged sectional view of a portion of the structureshown in Fig. 4.

Figure 5. is a fragmentary top plan view of the structure shown in Figure 4.

Figure 6 is a view similar to Figure 4 showing a slightly modified form of construction.

Figure '7' is a view similar to Figure 6 showing a still further modified form of construction; i

- Figure 8 is a fragmentary sectional view showing a modification of the structure shown-in Figure 4, and

on the line 9-9 of Figure 8.

Referring thenparticularly to" the drawings wherein several embodiments of the inventive idea are disclosed and wherein like reference characters designate corresponding parts throughout all views, there is shown-in Figure 1 a boiler designatedgenera'lly by the reference:

character 15, this boiler including the" wall 16- and the boiler tubes 1"7.- Formed in" the'boiler wall is an opening 1 8 in which a wall box 19 is mounted, and projecting through this wall box isablower element 20 coupled as at 21.toia swivel tube 22' which extendsto a pointexteriorly-of theboiler. The blower element. is provided: with a plurality of discharge openings 23. spaced:

throughout its length for directing jets of cleane ing fluid adjacent portions of. the boiler, such as the tubes 17.,- to be cleaned. The openingsZB may or'may not be provided with extendednozzles;

tions oi this character to form sufiicient nozzle openings in the blower element .to simultaneously direct jets of cleaning fiuid adjacent all portionsof theboiler to be cleaned. The practice has been: toadmit cleaning fluid to the blower clement-and:

to permit this cleaning fluid to be discharged through all of the 'openingssimultaneously whereby a plurality of relatively small jets of cleaningfiuid are produced, the size of the jets depend ing upon the capacity o'f'the blower element and the number or" discharge openings.

The present inventionv contemplates a fima provem'ent' in this practice by providingfirst;

means whereby the openings 23' in: the blower: element may be separately closed so that during the blowing operation only one of the, openings will be uncovered and all of the cleaninglfluid in -the" blower element will be discharged through thisopening withthe result that the cleanin'glfluid isdischarged in the form of a single powerful: jet.- The invention further contemplates the provision of closures for the openings, so arranged" that the openings may be individually' opened according to apredetermined. sequence so tl'iatfthe strong jet of cleaning. fluid may be dischargedfrom di'iierent points throughoutthe length of the blower element. The invention further contemplates the provision of mea'ns for imparting alon'gi'tudin'al orshuttling movement to the blow-- er element whereby each discharge opening" in the element maybe moved to'a plurality of spaced blowing; positions; Thus the'number' of discharge openings maybe decreased; the blowerelement Figure 9 is a sectional view taken substan'tially bei'ng longitudinally movable to' align these dis be cleaned.

In Figures 2 and 3 there is disclosed onejtype I of valve which maybe provided for .closing' the.

openings i2'3, and by reference to these figures it will be noted that a curved flexible p1atei25 is mounted within the blower element and held in"; place -adjacent the openings23- therein by cross pins-26. The plate 25 is provided-with aipluralityof openings 27 adapted upon longitudinal'move! ment of the plate to register with the openings 23. A rod 28 fixed to the end of the valve strip as at 29 provides means for effecting a longitudinal movement of the valve strip, as will hereinafter opening at one end of the blower element may flrst be uncovered and then a discharge opening atthe other end may be the next one uncovered upon longitudinal movement of the plate 25. For

convenience, however, the arrangement may be such as disclosed in Figure 2 wherein the'openings 23 are successively uncovered longitudinally of the blower element. As shown, all of the open ings 23 are closed, but the opening 27 is but one step removed from the opening 23%: while the opening 2'7 is two steps removed from the opening 23 The openings 2'7 and 27 are respec-v tively three and four steps removed from their respective cooperating openings 23.and 23 If, therefore, plate 25. is moved to the left, as viewed in Figure 2, opening 23 will first be uncovered and cleaning fluid may be discharged from the blower element through this opening. After this jet has been inoperation for a desired period of time, the plate may again be shifted one step to the left whereupon opening 23. will be closedand opening 23 wil1 be openedby virtue of the registration of opening 27 with the same. Obviously, movement of plate 25 may be continued in steps until all of the openings 23 have been successively uncovered in the order of their arrangement longitudinally of the blower element 20.

Thus the plate 25 provides for the discharge ofa powerful jet of cleaning fluid from any one of a plurality of spaced points throughout the length of the blower element; Further, by virtue of the fact that the blower element itself may be moved longitudinally, each jet opening may itself be placed, in one of several spaced positions within the boiler so that with a relatively small number of discharge openings, jets of cleaning fluid may be directed toward all portions of the boiler to be cleaned. Thus all of the openings 23 may be successively uncovered with the blower element in one position of its longitudinal movement, after which the blower element may be shifted longitudinally and all-of the discharge openings again be opened'to successively direct jets of cleaning fluid adjacent other 'portions of theboiler. The blower element may be mounted for shifting movement to any desired number of positions, it being preferable, however, to'limit, the movement to two or three positions since with this movement sumcient discharge openings may readily be provided in the blower element'to accomplish the desired cleaning;

Disclosed in Figures 4 and 5 is one formrof head for supplying cleaning fluid to a blower element such as disclosed in Figure 1, this head being provided, with means for effecting theabove described shuttling of the element and movement of. the valve strip. Referring then particularly to Figure 4, it will be noted that the swivel tube 22 is elongated and is'rotatably mounted in a headmounted exteriorly of the boiler wall anddesignated'generally by the reference character 35. T i

This head includes a goose-neck 36 connected as at 37to a'cleaning fluid supply pipe 38, there being p'rovided avalve 40 for controlling the flow of cleaning fluid from the supply pipe through the goose-neck. The upper end of the gooseneck is shaped to provide an elongated chamber 41 in which the swivel tube 22 is rotatably and slidably received. The opposite ends of the chamber 41 are closed by suitable packing glands '42 and the swivel tube is provided with a laterally opening port 43 for' receiving cleaning fluid from the chamber 41, as will be readily apparent.

In this form of construction the head is stationary and the swivel tube moves longitudinally throug'hlthe head to effect a shuttling of the blower element. Accordingly the swivel tube is extended through 'andbeyond the chamber 41 and isjprovided adjacent its outer end with a sleeve 45 provided on its outer periphery with the teeth 46. An extension 47 of the goose-neck carries at its outer end the ears 48 for rotatably supporting a shaft 49 above the swivel tube for actuating a pinion 50 which meshes with the teeth 46 on the swivel tube 45. A hand wheel 49' fixed to the end of this shaft provides means for rotating the pinion to effect a longitudinal movement of the swiveltube and the blower element.

For imparting a longitudinal movement to the valve strip to effect a registration of the ports therein with the ports in the blower element, the rod 28 is extended through the outer end of the swivel tube to receive a sleeve 51. This sleeve is rotatable on the rod 28 but is fixed against move ment longitudinally thereof by. the nuts 52 and 53 which engage its opposite ends. The sleeve 51 is provided on its upper face with a series of teeth 54 for engagement with ,a pinion 55' fixed to a shaft 56 rotatably mounted in cars 57 carried by the end of anextension 58 formed on a bushing 59 which is rotatably mounted on the outer end of the swivel tube and beyond the end of the extension 47. Suitable bars 60 fixed to the outer end of the swivel tube prevent movement of the bushing 59 longitudinally of the swivel tube while permitting rotation of the same thereon. A guide rod 61 carried by a downwardly extending lug 62 formed on the bushing 59 engages a bearing 63 formed ina portion 64 of the extension 47 for preventing rotation of the bushing 59 with thejswivel tube 22 A hand wheel 65 fixed to the shaft 56 provides means for rotating the pinion 55 to-effect a longitudinalmovement of the sleeve 51 and rod 28 and the hub of this hand wheel is preferably provided with suitable indicia 66 adapted to cooperate with indicia 67 formed on the adjacent car 57 to indicate the rotative position of the hand wheel. 7

The arrangement is such that the handwheel may be rotated to eifect a longitudinal movement of the valve strip and to thus eifect a registration of the ports in this strip with the ports in the blower element. The indicating marks on the hand wheel and supporting bracket may be so spaced as to indicate suflicient rotative movement of the hand wheel to advance the valve strip one step and to thus indicate registration of one of the ports therein with one of the ports in theblower element.

To provide for rotating the blower element to direct the jet of cleaning fluid in an are about the axis of the element, there is provided a gear '70 slidably keyed to a sleeve 71 fixed to the swivel tube. A bracket '72 fixed at its lower end to the goose-neck engages between a shoulder 73 formed 1 on the hub of the gear and a ring '74 carried by the hub of the gear for preventing movement of the gear upon longitudinalv movement of the swivel tub-e. A tie rod '75 connects the upper end ne ates of the bracket 72' with an extension76' formed on the goose-neck, and rotatably' mounted on this tie rod is a sheave wheel 7-7 carrying a pini'on 78 of a cam 80 fixed to the face of the'g'ear' 70, this cam being arranged to engage a trigger 81 which in turn is connected to the 'stem 82 of the valve:

each time the blower element is rotated the valve 40 is opened for aupredetermined portionofthe rotative movement of the blower elementto permit cleaning fluid to 'flow throughthe'goose-neck to the chamber 41.: The arrangement may be such that in the nor mal position of parts with the Val i/e40 'closed'and f the blower element therefore not discharg-ing cleaning fluid, the valve strip may be insuch a position that one of the openings23 and preferably that-opening. at the extreme inner end of the blower element, will be leftop'en sothat air may passthrough the blower element when-the latter is not-in use toefiect a cooling ofthe same. To

form aninlet for this air, a-port 85may-be formed irr the groose=neck 36} and a ball valve 86 may be supported adiiaeent this port by a pin or the like 87', the arrangement being such that when-cleaning fluid is flowing through the goose-neck the pressure of the same will force the ball against the port to close the port, while when cleaning fluid is notflowing through the goose-neck the ballwill fall away from the port topermit air to enter the same. Thus the position of rest of the blower element air may be drawn through the normally open dischargeopening thereof by the furnace draft, this air passing through the goose neck, entirely through the element and out through the end discharge opening. If desired, air might be forced through the blower element by a suitable blower (not 'showmcarried by the head adjacent port 85 From the above it is believed that the structure and operation of the structure as thus far disclosed will be clearly apparent. When asso ciated with a head such as disclosed in Figures- 4 and 5, the blower element will be mounted for rotation as well as for shuttling movement, the head however being fixed relative to the boiler wall. The shuttling of the blower element may be effected by rotation of pinion 48, the chamber 41 being sufficiently long to supply cleaning fluid to the swivel tube through the port 43in the extreme positions of movement of this tube. The

hand wheel 65 may be actuated toactuate the valve strip and to thus close all of the discharge openings in the blower element or to open these ports one at a time in accordance with a predetermined desired sequence. The normal position of the valve strip may be such that one of the discharge openings will' be' uncovered whereby air may be circulated through the blower element" to cool the same, although all of thedischarge openingsmay'b'e closed if desired, as will be readily apparent. I i I The blower element may be rotated or oscillated by the gear70 which in turn isdriven from r the sheave 77-, and the valvelll will be periodically opened and closed during a predetermined arc of rotation of the blower element. Thus a powerfuljet of cleaning fluid may be discharged from the blower elementat any one of aplurality' of Y spaced points throughout the'length of the element and the element itself may be shifted axially to change the matron of all ofthe discharge:

openings thereof relative to the portions of the" boiler to be cleaned.

In Figure 6 aslightlymodified form of construction is shown in which the blowerhead isadapted to move with the blower element: upon.

shuttling of the latter. Referring then" to this figure of the drawings, the numeral 90- designates I generally the blower head, this head being simi-' lar inconstruction to: the head 35' andv including a goose-neck 36 Thisgoose-neck isconnected at its lower end to a cleaning fluid supply pipe 92- which in this case is flexible to pe'rmit'the'i movement of the head incident to the shuttling 1 of the blower element, a a

The swivel tube 22* is journaled adjacentits outer end in the bracket 72 the gear'70 being in this case directly fixed to the swivel tube by a set screw 93. An extension 94 may be threaded into the end'of the swivel tube and may be journaled'at its opposite end in one end of the gooseneck to receive cleaning fluid therefrom.

The gear 70 is driven by the pinion'7'8 which in turn rotates with the sheave wheel 77': and the cam 80 is connected to'the gear for actuating the valve 40 as described in connection with-head 35. The rod 28 providedifor effecting a longitudinal movement of the valve stripv extends through the goose-neck forconnection' tothe actuating mechanism disclosed anddescribed as being associated with head- 35. 1

For eiiecting ashuttling of theswivel tube and the head, there is provided a sleeve 1"00"provided at its end with an annular flange lOI-boltedito the bracket 72 as'at 102}. This sleeve isprfo' vided on its upper face with the teeth 103 with which a pinion 10 i meshes. This pinion is fixed to a shaft'105 journaled in a bracket I06" carriedby a bushing 107 which is fixed in any desired manner to the outer'flange of the wall box 1 9 The bushing 107 is preferably slotted as at-1i0 8 to receive apin 1'09 carried by the sleeve whereby this sleeve is prevented from rotating with the swivel tube. I

The arrangement is such that the blower element maybe rotated, the swivel tube 22 being rotatable within the sleeve 100 for: this purpose. To effect a shuttling of the blower element the pinion 1 04' may be rotated by'any suitable hand wheel (not shown) fixed to the shaitl05 Rotationof the pinionloe effects a longitudinal movement of the sleeve 100' which in turn moves the head 90 toward or away from the boiler wall In Figure 7 a still further form which the in-' ventionmay assume is disclosed in which the blower element is not mounted for rotation but is merely mounted for shuttling 'movement.- In

' this form of construction the head is quite similar to the head 90 and includes the gooseneck 36 connected as at 116 to a flexible supply pipe 117-. Since the blower element in this'form of construction is not rotatable, there is-no auto matic valve structure associatedwiththe head; and'a suitable manually controlled valve 118' is mounted in the supply pipe to control the supply of cleaning fluid to the blower element.

The" goose-neck opens at its upper end into the theltierodto the bracket '76 carried by the,

upper end of ,the goose-neck and forms asupport for the tube .22 intermediate its; ends as at 120.

this form of construction thesleeve is fixed as at 102 to the bracket 72 and is also fixed against movement 'relative to the tube 22 by the set screw 121. Thus the tube 22 is locked against rotation but is movable with the sleeve 100 whenthe latter is moved axially by the pin ion 104. The rod 28 may be actuated by a mechanism similar in all respects to'that disclosed as being associated, with the head 35, to effect a shuttling of the valve strip as before described,

. In this form of construction the head may be moved to effect a shuttling of the blower element and the ports of the element may be opened as desired by a proper actuation of rod 28. 1 The blower element, however, is fixed against rotation and the supply of cleaning fluid to the same is controlled by the valve 118. In this form of invention it is particularly desirable that the valve strip 1 be so constructed that the same may be moved to a position-to close all of the discharge openings in the blower elementso that during shuttling of the blower-element from one blowing position to the next, the discharge openings themselves will be closed to eliminate the necessity of closing valve 118. Asin the above described forms of construction, when the blower ment in the grooves 126.

element is at rest, air may be drawn through the same through port 85 and discharged through the end discharge opening of the blower element which maybe uncovered after valve 118 is closed. In Figures 8 and 9, a slightly modified form of actuatingmechanism for the rod 28 is disclosed, which actuating mechanism may be associated with any of, the heads above described. In this form of construction there is fixed to the end of the rod 28 for rotation therewith a sleeve provided on its periphery with a plurality of spaced grooves 126. A handle 127 fixed to the end of the sleeve 125 by a pin 128provides means for manually imparting a longitudinal movement to the sleeve and the rod 28 while a spring memher 129 fixed as at 130 to the adjacent portion of the goose-neck, or any other adjacent nonrotatable member forming a part of the head structure, has its end 131 adapted for engage- Thus the spring member serves toindicate the position of the sleeve 125 and the rod 28 which in turn indicates the position of the valve strip relative to the discharge openings in the blower element. Since the grooves are continuous about the periphery of the sleeve 125, this sleeve may be free to rotate with the rod 28 when the latter rotates upon rotation of. the blower element. I I

1 From the above it will be apparent that the winventionprovides a shuttling blower element which may be rotatable or non-rotatable as desired, 'Iheinventionfurther provides means for uncovering the discharge openings of such a blowerielementin accordance with a desired sequence so that single powerful jets of cleaning fluid may be discharged from the-blower element discharge :openings may be-closed,v while during the periodsof rest of the'blower element air may flow of cleaning fluid to the blower element in timed-relationto the rotation of the element and it further provides means independent of this valve for controlling discharge of cleaning fluid from the element. Thus the flow of cleaning fluid from the supply pipe to the element is automatically controlled in timed relationrto the rotation of the element by the valve arranged in the blower head, while the discharge of cleaning fluid from the element through; the discharge openings therein is controlledby the valve strip which is operable independently of the automatic valve.

For thesake of convenience the invention has beendescribed as being embodied in a device for cleaning boilers. It will be apparent, however, thatthe inventive principles disclosed may be incorporated in devices for cleaning apparatuses similar to. boilers, and ,it is to be therefore understood that the term boiler wherever used throughout the specification and claims is to be construed as meaning a fluid heater or heat transferapparatus of any character, while the term boiler cleaner is to be construed as meaning a cleaner for any such type of apparatus.

While the invention has been described with considerable detail, it will be clearly apparent that the description is illustrative only of the several mechanical embodiments which the inventive principles may assume. It is to be clearly understood, therefore, thatthe description is not definitive of the limits of the invention and that the right is. reserved to make all changes which will fall within the purview of the attached claims. a

What I claim as'my invention is:

1. In a boiler cleaner, a blower element extending through a boiler wall and having discharge openings spaced throughout its length for discharging jets of cleaning fluid adjacent portions of the boiler to be cleaned, a head arranged exteriorly of said boiler wall for supplying cleaning fluid to said blower element, means for controlling the discharge of cleaning fluid from said blower element through said discharge openings according to a predetermined desired sequence, and means for moving said head relative to said boiler wall to eifect a shuttling of said blower element, said last mentioned means including a sleeve fixed to said head, teeth formed on said sleeve, and a pinion fixed relative to said boiler wall and engaging said teeth.

2. In a boiler cleaner, a blower element projecting through a boiler wall and having discharge openings for directing jets of'cleaning fluid adjacent portions of the boiler to be cleaned, a valve strip arranged within said blower element having ports adapted upon movement of the vvalve strip to register with said discharge openings to permit the discharge of cleaning fluid from said blower element through said openings according to a predetermined desired sequence, a

head arranged exteriorly of said boiler wall for.

supplying cleaning fluidto said blower element, means associated with said head for effecting a shuttling of said blower element, and additional means associated with said head-for effecting an actuation of said valve strip to control the discharge of cleaning fluid from said element, said last mentioned means including a rod fixed to said valve strip, a rack carried by said rod, .and a pinion engageable with said rack to move the same.

3. In' a boiler cleaner, a blower element projecting through a boiler wall and having a series of discharge openings for directing jets of cleaning fluid adjacent portions of the boiler to be cleaned, means for controlling the discharge of cleaning fluid through said openings according to a predetermined desired sequence of said openings, a head arranged exteriorly of said boiler wall and flxed relative to the boiler wall for supplying cleaning fluid to said blower element, and means for efiecting a shuttling of said blower element within said head, said last mentioned means including a sleeve flxedrelative to said blower element, teeth formed on said sleeve, an extension formed on said head, and a pinion carried by said extension and engaging the teeth on said sleeve to impart a longitudinal movement to said sleeve.

4. In a boiler cleaner, a rotatable blower element having a plurality of discharge openings for directing jets of cleaning fluid adjacent portions of a boiler to be cleaned, means for effecting a shuttling of said blower element, a valve for controlling the flow of cleaning fluid to said blower element in timed relation to the rotation thereof, and means operable independently of said valve for controlling the flow of cleaning fluid through said discharge openings according to a predetermined desired sequence of said openings.

5. In a boiler cleaner, a blower element provided with a plurality of discharge openings spaced throughout its length, valve means for controlling said openings according to a predetermined desired sequence, a blower head journaling said blower element for rotation about its axis, means for moving said blower element longitudinally of its axis and relative to said blower head to spaced blowing positions, means carried by said blower head and feathered to said blower element for rotating said blower element, and means for actuating said valve means movable with said blower element upon movement of the latter to said spaced blowing positions.

6. In a boiler cleaner, a blower element provided with a plurality of discharge openings spaced throughout its length, valve means for controlling the discharge of cleaning fluid from said openings according to a predetermined desired sequence, a head for said blower element,

means for moving said head to move said blower element to spaced blowing positions, a flexible Supply pipe for said blower head providing for the said movement of said blower head, and means for actuating said valve means, said last mentioned means being carried by said head and movable therewith upon movement of the blower element to spaced blowing positions.

'7. In a boiler cleaner, a blower element provided with discharge openings spaced throughout its length, valve means forcontrolling the discharge of cleaning fluid from said openings according to a predetermined desired sequence, a

blower head journaling said blower element for rotation about its axis, a flexible supply pipe connected to said blower head to provide for movement of said blower head, means for mov-. ing said blowerhead and said blower element to position the discharge openings of the blower element in spaced blowing positions, and actuat ing means for the said valve means carried by the blower head andmovable therewith upon movement of the blower element to the said spacedblowing positions. I

8. In a boiler cleaner, a blower head fixed relative to a boiler wall, a blower element journalled in said head for receiving cleaning fluid therefrom and projecting through an opening in said boiler wall to adjacent parts of the boiler to be cleaned,- means for moving said blower element longitudinally relative to said head, and means for rotating said blower element including a gear carried by said blower head and feathered to said blower element wherebythe latter may move relative to the gear during longitudinal movement of the blower element. I

9. In a fluid heater cleaner, a blower element, a blower head for supplying cleaning fluid to said blower element, said blower element being jour-,

nalled in said blower head for rotative and longitudinal movement therein, means carried by said blower head and feathered to said blower element for rotating said blowerelement, means including a member carried by said last mentioned means and rotatable therewith for coni trolling the supply of cleaning fluid to the blower element in timed relation to the rotation thereof, and means for moving said blower element longitudinally of said blower head.

10. In a fluid heater cleaner, a blower head fixed relative to a fluid heater wall, a blower element journalled in said head for rotative and longitudinal movements therein, said blower element projecting through an opening in said fluid heater wall and having discharge openings ar-.

ranged-to directjets of cleaning fluid adjacent portions of the fluid heater to be cleaned, means for rotating said blower element, means carried by said blower head for controlling the supply of cleaning fluid to said blower element in timed relationto the rotation thereof, means for controlling the discharge of cleaning fluid from said openings according to a predetermined desired sequence of said openings and means for movingsaid blower element longitudinally of the blower head to move the discharge openings of the blower element to spaced blowing-positions. I

11. In a fluid heater cleaner, a blower element projecting through a fluid heater wall and having a series of discharge openings for directing jets of cleaning fluid adjacent portions of the fluid heater to be cleaned, a head arranged ex teriorlyof said fluid heater wall and fixed relative to the said fluid heater wall for supplying cleaning fluid to said blower element, a gear carried by said head and feathered to said blower element for rotating the latter and means for effecting a shuttling of said blower element within said head, said last mentioned means including a member fixed for longitudinal movement with saidblower element, teeth formed on said member, and a pinion carried by said blower head and engaging the teeth on said member to impart a longitudinal movement'to said member.

NORMAN L. snow.

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