US2185450A

US2185450A - Soot blower seal

Info

Publication number: US2185450A
Application number: US207852A
Authority: US
Inventors: Wager Robert Hudson
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-05-13
Filing date: 1938-05-13
Publication date: 1940-01-02
Anticipated expiration: 1957-01-02

Description

sooT BLOWER SEAL Jan. 2, 1940. R. H.WAGER SOOT BLOWER SEAL 2 Sheets-Sheet 2 Filed May 13, 1938 a .tA y d ,M m a e m a w m a W L J w f H1 z ,r I@ a 00 a r 1 2 e f T f 2 .WU ,w i1 d 33V. f d

i C j d L ,d a Qu 0,1 Y a6 2 (2 wr y 5 w 7 v fg 5.?. .wmf .y s w W2 .v (Aw W Patented Jan. `2, 1940 2,185,450 soor BLOWER SEAL Robert Hudson Wager, Maplewood, N. J. Application May 13, 1938, Serial N0. 207,852

UNITEDl STATES PATENT OFFICE y;

9 Claims.

The; invention relates to the devices for blowingsoot from boiler tubes, of the general type having ya rotatably or non-rotatably mounted blower element passing'thro-ugh an opening in the boiler wall, said blower element having jets for Adirecting the soot-blowing air or steam in Vvarious directions against the boiler tubes and/ ory other internal parts of the boiler.

`the outer end of the blower element and the `boiler wall to preventsoot from blowing out of the opening through which said blower element extends into the boiler furnace.

f While .relatively complicated and expensive seals heretofore devised for the above mentioned purpose, have possessed a fair degree of eniciency with relatively little maintenance trouble,

seals of comparatively simple and inexpensive constructionxhave fallen short of requirements as to eiciency, trouble-free operation and durability. yIt has been the object of the present invention, however, to' provide a seal to meet all requirements and at the same time be of such simple and inexpensive construction as to be truly practicable, and actual manufacture, installation anduse have shown that this end has been attained.

Fig:Y 1- of the accompanying drawings isl a vertical longitudinal sectional View partly in elevation showing a` preferred assemblage of parts forcarrying out the invention.

Fig. 2 is a vertical transverse sectional View on f ment ring for thespring, sho-wn in Fig. 4.

Fig. 8 is a horizontal sectional view of the abutment ring on line 8-8 of Fig. 7.

' Figs. 9 and 10 are detail sectional views illustrating anti-friction thrust bearings-which may 4be provided for "the spring.

' .While preferred features of 'constructionhave been shown' andwill be specically' described,

attention is invited to the possibility of makingv (Cl.285-30) I numerous variations within the scope of the invention as claimed.

In Fig. 1, a portion of a boiler wall 5 is shown including an outer hollow wall 6 and an inner wall or baiile plate l, there being an air space 8 between said walls 6 and 1. An angle-metal or channel ring 9 is rigidly included in the rwall 6, said ring having a substantially cylindrical flange I at its periphery and a second flange Il which projects inwardly from the `outer edge of said flange I0. A metalv sleeve I`2 extends between the two walls 6 and l and passes through the ring9 in contact with the inner edge of the flange Il, the outer end of said sleeve being extended beyond said flange inthe present' showing. The inner end of the ysleeve I2 is shown as contracted and lwelded at i3 to the inner Wall or baiiie plate l, around `an vopening I4 in the latter.

In the space between the sleeve l2 and lthe I) cylindrical flange Ill of the ring 9,' there is a reproof packing I and a retaining ring I6 for said packing. A gasket I1 lies against this retaining ring and the thimble I2v is :provided with an integral peripheral Iiiange I8' 'lying against 'said gasket. Bolts f2() passthroughthe parts I8, I1, I6, I5 and il, and`project outwardly beyond the latter. Clamping nuts 2l are threaded on these bolts in contact with washers I9, thereby holding the parts through which the bolts pass in rigid relationy withtlie sleeve I2.

All of the above may be considered as conventional construction.

The outer ends of the bolts 20 project considerably beyond the projecting outer end of the sleeve I2 and pass through' relatively large openings 22 in a Vertical plate 23 (Figs. l'and 2) which extend across the outer end of-said sleevel2. A gasket 24 is interposed between` the plate 23 and the plate I2, washers 25 extend over 40 the openings 22 at the outer side of the plate 23, and nuts 26 are threaded on the outer ends of the bolts 29 to force plate 23 toward the sleeve I2, thereby fluid-tightly clamping the gasket 24' in place and preventing any leakage of dust- 4,5 laden gases. Leakage around the exterior of the sleeve I2 is prevented by the packing l5 and the gasket I1, and any possible leakagey through the bolt holes and under the nuts 2l is' prevented by said gasket Il and the washers I9.

The plate 23 is formed with an opening'Z'l about concentricwith the-sleeve I2 but` of considerably less diameter than said sleeve. The rotatable or non-rotatable blowerv element `28` extends from the usual blower head or the like 29 55( thro-ugh the opening 2, through the sleeve I 2 and through the opening I4 into the furnace of the boiler, said blower element being inwardly spaced from the edges of said openings 2l and I4 and being, therefore, also in inwardly spaced relation with said sleeve I2.l One of the steam or air discharge jets of the blower element 28 is shown at 3!! but I have not illustrated any means for rotating said blower element nor means for supplying steam or compressed air thereto, all of which are well known in the art.

A flexible metal sleeve 3i of circumferentially corrugated nature, is disposed within the rigid sleeve I2 and surrounds the blower element 23, v

being spaced from both said sleeve I2 and blower element 2t. At its outer end, the sleeve 3i is welded or otherwise fluid-tightly secured to the plate 23 around the opening 2, the welding or thelike being indicated at 32. The inner end of the sleeve @I is similarly welded or otherwise secured at 33 to a circular closure 361 which surrounds the blower element 28, said closure having a cylindrical wall portion 35 in spaced concentric relation with said blower element, and an inwardly projecting flange 36 at the edge of said wall toward the opening Ill. Appropriate heat-resisting packing 3l is provided in the channeled seat formed by the closure portions 35 and 3I5V and the contiguous portion of the blower element 28, said packing contacting huid-tightly with the periphery of said blower element. A follower ring 38 is shown contacting with the packing 3? and the inner end of a coiled compression spring 3&7 is shown abutting said follower ringto inwardly press the latter, thereby holding the packing 3l' operatively seated to preventA any leakage of dust-laden gases into the sleeve 3l. However, as will hereinafter appear, other spring' means may be provided in place of springl 3S, as in Figs. 4 and 9, hereinafter described, for example. When spring 39 is-used, its outer end may directly abut a portion of the blower head or'v the like 2S as seen in Fig. 1 or a thrust shoulder may be provided in any other suitable way, for instance, by means of a collar 4S, secured by a set screw lll to the blower elements 2S, as illustrated in Fig. 3, or in the ways illustrated in Figs. 4, 9 and l0, later described. When the spring directly abuts the blower head l or thelike 29, the latter is preferably provided with a shallow groove t2 forming a seat for the outermostconvolution of said spring.

In 4 to 8, a modification is shown. In these views, the elements I2a, 23a, 2da, 29a, 25a, 26H, 35%, 32M, 282, and Sla correspond tothe elements S2, 23, 2li, 2li, 25, 26,35, 3l, 28 and 3| above described. The opening Z'la of the abut-` ment plate 23a, however, is provided with notches 23b inits edge wall, and the inner side of said plate'is provided with depressed seats 23C circumferentially spaced from said notches. An abutment ring 39e is provided for the spring b which seats the packing 371, being provided with a rib 396 to surround the outermost coil of said spring. Ring 39a is provided with radial lugs 39d and said ring is insertable through the opening 21a when said lugs are alined with the notches 23h. Then, the ring is turned until the lugs 39d seat in the seats 23, in which they are` held by the pressure of spring Stili if desired and while its inner end may be associated with the packing 37a in the same manner as spring 39 is associatedwith packing 3l, I prefer to interpose a sleeve 39e between said spring 36h and said packing 31a.

In Fig. 9, a ball thrust bearing 4ta is provided,`

against which the packingseat lspring ggm'ay thrust, and a packing-,engaging sleeve 39h is shown abutting the inner end of saidv spring.y This arrangement may be usedinstead of those 1 shown in Figs. l and 3 if desired.

In Fig. 10, I have shown another form of thrust bearing which may be used for the pack-v ing-seating spring. In this View, Mib .denotes a j collar suitably secured on the blower element, de refers to a steel washeragainst which the spring abuts, and 49d has reference to a bronze 1 washer between said collar 46h and Washer v`lll".

"Obviously, the thrust bearings shown in Figs. 9` and 10 would be used only when the blower element be rotatable, but such arrangementsas those shown in Figs. Vl and 4. also operate advantageously with a rotatable blower element, with` n kthrust Moreover, the seal will remain.'

tight, no matter how much the blower element;

may expand and contract and no ma-tter howl f much said blower element may become warped from the heat. Furthermore,` the seal -will give long trouble-free operation andwill not be af."- fected by any longitudinal lungingroitheblower element which may occur `during the performs' ance of a soot-blowing operation. .If the blowera-` element be so warped that its outer end'pjortion,v

cannot rotate truly, the flexible metalsleeve lwill readily yield and allow the packing tofren'iainlin4 tight sealing contact with said blower element;

In short, an effective seal is providedv under all.'

conditions encountered. Y While excellent results have` been obtained from the details shown and described,'and they are therefore preferably followed, attention'isl again invited to the possibilty of making varia-` of the invention as tions within the scope claimed.

I claim: ..5' 1. In a soot blower having a blower'element extending through a relatively largeiopening'in said blower element within said opening',` said flexible metal sleeve being spaced from the walll of said opening and fromv said blowerrelement, aplate having an opening through which said blower element passes without contact with-said plate, the front end of said exiblemetal sleeve being fluid-tightly secured to said plate around said opening thereof, said' plate `beingrsecured to the boiler walland fluid-tightly closingthe outer end of said wall opening around said flexible metal sleeve, means fluid-tightly. closing the inner end of said exible sleeve around said blower element and including a packing, spring means for seating said packing, and an abutment ring *50' a boiler wall; a flexible metal sleeve surrounding against which said spring means thrusts, said i abutment ring surrounding said blower, element.` and having peripheral lugs abuttingsfthe inner side of said plate, the openingof said plate beingl l,

notched to permit passage of said lugs when said abutment ring is sufficiently turned.

2. A structure as specified `in claimV 1;; said inner side of said plate being vprovided with depressed seats normally'receiving saidy lugs.

3. In a soot blower having ablower element extending through a relatively large opening in a boiler wall; a flexible metal sleeve in said opening, surrounding and spaced from said blowerv element, andextending toward the interior of the boiler, means for non-rotatably connecting the outer end of said flexible metal sleeve with the boiler wall and for fluid-tightly closing said opening around said outer end of said flexible metal sleeve, a circular closure for the inner end of said flexible metal sleeve constituting a packing seat, a packing surrounding said blower element within said sleeve and engaging said seat, and spring means within said sleeve and thrusting against said packing for holding the same operatively seated.

4. In a soot blower having a blower element extending through a relatively large opening in a boiler wall; a flexible metal sleeve in said opening, surrounding and spaced from said blower element, and extending toward the interior of the boiler, means for non-rotatably connecting the outer end of said flexible metal sleeve with the boiler wall and for fluid-tightly closing said opening around said outer end of said flexible metal sleeve, a circular closure for the inner end of said flexible metal sleeve, said closure having a cylindrical wall surrounding and spaced from said'blower element and an annular flange projecting inwardly from the inner end of said cylindrical wall, providing a circular channeled seat which opens toward the outer end of said flexible metal sleeve, a circular packing in said seat and contacting with said blower element, and spring means surrounding said blower element within said flexible metal sleeve and thrusting against said packing to hold the same operatively seated.

5. In a soot blower having a blower element extending through a relative large opening in a boiler wall; a flexible metal sleeve in said opening, surrounding and spaced from said blower element, and extending toward the interior of the boiler, a plate having an opening through which said blower element passes without contacting said plate, the front end of said flexible metal sleeve being fluid-tightly secured to said plate around said opening thereof, said plate being secured to the boiler wall and huid-tightly closing the outer end of said wall opening around saidl flexible metal plate, a circular closure for the inner end of said flexible metal sleeve and constituting a packing seat, a packing surrounding said blower element within said sleeve and engaging said seat, and spring means within said sleeve and thrusting against said packing for holding the same operatively seated.

6. In a soot blower having a blower element extending through a relatively large opening in `a wall; means for preventing escape of soot through said opening around said blower element, including a flexible metal sleeve surrounding and spaced from said blower element and a packing in the inner end of said sleeve, spring means within said exible sleeve for seating said packing, an abutment ring against which the outer end of said spring means thrusts, said abutment ring surrounding said blower element and being spaced therefrom, a fixed abutment adjacent said abutment ring and also surrounding and spaced from said blower element, and connecting means between said abutment ring and said fixed abutment releasable by turning of said ring with respect to said xed abutment.

7. In a soot blower having a blower element extending through a relatively large opening in a wall; means for preventing escape of soot through said opening around said blower element, including a iiexible metal sleeve surrounding and spaced from said blower element and a packing in the inner end of said sleeve, spring means within said iiexible sleeve for seating said packing, an abutment ring against which the outer end of said spring meansthrusts, said abutment ring surrounding said blower element and being spaced therefrom, a xed abutment adjacent said abutment ring and also surrounding and spaced from said blower element, and lugs on said abutment ring abutting portions of said lixed abutmentand releasable therefrom by turning of said abutment ring with respect to said fixed abutment.

8. In a soot blower having a blower element extending through a relative large opening in a wall; means for preventing escape of soot through said opening around said blower element including a flexible metal sleeve surrounding and spaced from said blower element and a packing in the inner end of said sleeve, spring means within said flexible sleeve for seating said packing, an abutment ring against which the outer end of said spring means thrusts, said abutment ring surrounding said blower element and being spaced therefrom, a fixed abutment at outer side of said abutment ring and surrounding said blower element, and peripheral lugs on said abutment ring lying against the inner side of said fixed abutment, said fixed abutment being spaced sufciently from said blower element to allow outward passage of said abutment ring when said lugs are freed from said fixed abutment, the inner edge of the latter having notches through which said lugs may pass when said abutment ring is A turned with respect to said fixed abutment.

9. A structure as specified in claim 8; the inner side of said xed abutment being provided with depressed seats normally receiving said lugs of said abutment ring.

ROBERT HUDSON WAGER.