US1760589A - Boiler attachment - Google Patents

Description

May 2,7, 1930. l. D. EBY

aoILER ATTACHMENT Filed April 2, '1924 l@ ciencyof the boiler.

sirable for `etlicient operation to `frequently clean this soot fromthe tubes. 'llhislopera Patented May U27, 1930 t `Bonnin` ATTACHMENT Appnatin inea Apn e,1e24.` `serieu No." @3,929.1

The present invention relates `to improvements in boiler attachments and more particularly to devices designed for usein blowing` the soot out of the tubes of the boiler. L

` `5 Itis well known that a deposit ofsoot tends to accumulate in boiler tubes. This soot is one i of the best Jheat `insulators known, and even a very thin coating ofsoot brings about con".- siderable heatloss,thereby reducingvthe elh- It is, therefore, de-4 tion has generally beenineglected by they op? y eratingl force in the boiler room onmacconnt of heavy labor required andn excessivewheat presentfin cleaning-the soot with the less expensive devices usually available for the purpose.` Thefinstallation of effectivelsoot#` blowing;` apparatus heretofore available has been `very expensive andtherefore comparatively seldoni used. i i. l i i `Devices `for blowing soot, heretofore available, have, in general, involved the use of fixtures `permanently mounted adjacent the boiler tubesfalnd these fixtures, besides be-I ing expensiveitoinstall, require inspection anddeteriorate rapidly. ln some casesthey f require the closing, up of a `boiler tube,.there` by loweringI the eiiiciency of each furnace of the boiler and inviting 4corrosion and scale. The present invention contemplates boiler attachments, `by means of which `one can readily clean the soot from the boiler tubes without great effort. It also contemplates l a soot blowing arrangement `by :which the .boilerimay becleaned at frequent intervals without the necessity of shutting downithe boiler, opening the smoke doors, orcutting the boiler oif thexsteam line.; ltalso contemplatesthe provision of a soot blowing devicewhich` utilizes a jet of steam introduced into thecombustion chamber to blow thesoot in the direction of the draft, and the removal of theV device for producing the steam jet upon thecompletion ofthe blowing of the soot',

Thewdevices heretofore in use have genf fellation of the complete for each furnace inthe boiler, which can be installed in aninexpensive manner, and the use of apsingledevice which may be introduced intoany of the furnaces to blow `the tubes thereof.` In this manner, the installation expense is much lower becausea single soot blowing device may be utilized to blow all the boilers inthe power plant or onboard the ship. L. l ,i l

The accompanying drawings show, 'for the purposes of illustrating the invention, one of theimany possible embodiments inwliieh the present invention may take form. Y

ln these drawiings:` y, K l 'i l is a longitudinalA sectional view4 through the soot blower; i

Fig. 2 isa crosssection on the line 2-2 of Fig. l; and V;

Fin'. 3 is a diagrammatic `view showing-the use orl the blower ina conventional boiler.

For the purpose ofl illustrating the` invention, the same is shown in use in a Scotch marine type boiler. It is, of course, obvious that the invention is in no wise limited to this type of boiler as itis capable ofgeneral apf plication. The boiler here illustrated has the conventional heating section ll, `made up a plurality of tubes, the furnace l2, ycoinbus tion chamberl, water leg lll, smoke bon7 lo, and uptake lo. rlhe smoke box door '17 vided with attachments, designated e,... by the letter Andi-ich include a tubular n1'` ber subsi'zantially in alignment with one ci central tubes of each furnaceof the boiler.`

.The soot blowing` deviceshown in detail in Figs. `l and `2 is adapted to be, inserted through theA `smoke-box door Aand one of the tubes of the heating section so that the noz- Zle end .of the blower extends into the coinbustion` chamber.` l l A tubular member 18 here shown in the form ofa length of hoselS coupled to an innerpiece of pipe 19. It is adapted to reach from in front of the smoke-box door into the combustion chamber. y The length of the piemis such that, a substantial length of pipe remains in` a boiler tube. The inner end 19 of this` pipe is here shown as being' threaded into an outertubular member 20, .and an inner tubular member or shell 2l is slidablyr Y and rotatably mounted inside the outer tubular member. The parts 19 and 20 are prefern ably, though not necessarily made separate. The ma be integral if desired.

T e le t end 22 of the shell 21 is here shown as being threaded into the open end of a revolve-ble head 23, but these parts may like- Vwise be integral if desired. The shell and head are however, preferably made of two separate steel castings. The head may be cast hollow, a hole being provided in the' rovided with saw cuts 28 to facilitate threading it in or out of the hole 26. As here shown the inner and outer tubular members 2G and 21 are provided with shoulders 29 and 30 to limit the sliding movement of these parts, vand prevent the accidental removal of the revolvable head. In order to provide a steam tight joint between these parts there may be'provided a piston ring 31, and the outer member Amay be provided with grooves 33 to reduce the bearing surface and to receive oil if desired. Y

The rivht hand end y34 of the hose 18 is connee by an ordinary hose coupling 34a to one en-d 35 of aT or valve casing 36, while Y a bushing 37 may be clamped to the other end f 38 ofthe casing by a nut-39 as shown. A (OV driving shaft 40 is rotatably carried in the bushilrg and is made steam tight by a stuffing box 41 held tight by a cap 41 threaded onto the bushing. The shaft 40 extends outside the stuffing box and is connected to an operating means in the form of a 'crank 42 adjustably locked onto the shaft. The side 43 of the casing is connected to a steam supply hose 43 through the medium of an ordinary steam hose coupling 43a so that steam is introduced into the chamber formed by the casing and parts connected thereto. One may conveniently make up this structure from a o valve, b removing the `valve seats and substituting t e driving shaft for the valve stem.

The steam pressure reacting against the head 23 will tend to forcethe shoulder 3() against the shoulder 29. This is prevented1 andthe head is made rotatable "by drivingly connecting the shell 21 to the driving shaft 49 by a flexible shaft 44 which extends between them inside the tubular member, hose, and casing '36. One end 45 of this shaft is pinned to a sleeve 46 threaded and pinned onto the inner end 47 of the driving shaft, while'the otherend 48 is pinnedltoa coupling 49 threaded into a boss 50 carried on a yoke 51 at the inner end of the shell 21. The thrust produced by the steam or compressed air inside the casing is transferred through this vflexible shaft to the operating shaft 40 and is imposed onto the casing by the hub 42 of the crank engaging the cap 41. Oil may be applied here, as this is the only Wearing place subject to heavy load.

The operation of the soot blower is as follows :The revolvable head and attached tubing are inserted through a hole in the smoke box door (or through the tubular member A, if one is provi-ded) and through the boiler tube lso as 4to bring 'the revolvable head into the combustion chamber, somewhat as indicated in Figure 3. Steam (or compressed air) is turned on and escapes at high velocity through the nozzle. This escaping jet of steam is directed toward the adjacent header of the boiler where it lenters a tube and cleans the soot off the tube walhthe soot being carried away in the direction of the draft. The operatorturns the crank 42 and thereby turns the shafts 40 and 44 so that the revolvable head and nozzle are rotated to direct the jet of steam through a conical path and reach a circular zone vof boiler tubes. The entire blower may be reciprocated back and forth in the boiler tube and thereby cause the jet to reach tubes fat varying distances from the central tube. The nozzle is supported by the pipe 19 ya substantial length of which is in the boiler tube. In this manner all the tubes in the furnace may be cleaned. After the operation has beencompleted in yone furnace, the blower may be removed to another furnace or stored 'as desired.

yThe present embodiment 0f the invention contemplates the use of a hose 18 between the T 'and the pipe 19, as the hose is .flexible and permits the insertion of the blower in cramped locations common on shipboard. VVhere the room would permit, one could use a piece of pipe, and a rod instead of the flexible shaft 44.

It will be noted that the flange on the inner end of the shaft 40 will prevent the accidental removal of the shaft, should the ilexible shaft break. This flange, together with the shoulders 29 and 30 prevent scalding in case the flexible shaft breaks.

'Some boilers are provided With .a tubular member expanded into the wat-er leg of the boiler in line with the furnace, and in this lcase one may, if desired, use a soot blower having the nozzle disposed in the other direction, and insert it into the combustion chamber through the water leg. In this case it might be more convenient to provide a short unitary casing instead of the multiple 'part tubular member and hose.

While I have described the soot blower as being operated by steam, it is, of course, obvious that one could use compressed air, if

desired. The term steam is used in the `claims merely as a designation for a suitable operating medium.

It is obvious that the invention may be einbodied in many forms and constructions, and

i I wish it to be understood that the particularA form shown `is only oneof the many forms. Various modifications and changes being possible, I do not limitamyself in any way with `respect thereto.

`What is claimed is: Y Y

l. A soot blower adapted to be entirely removed from a boiler' or furnace for use in another boiler or furnace and structurally independent thereof, said soot blower having a tubular member adapted to be inserted through a tube leading to the combustion chamber of a boiler, a hollowshell revolvably carried inside the tubular member, a head supported by said shell and projecting out of one end of the tubular member and provided with a `et-formino' nozzle a casinoi having a r9 7 b In fill steam inlet and attached to the other end of thetiibular member, a driving shaft rotatably supported by the casing, a flexible shaft connected tothe shell and the driving shaft, the flexible shaft transferring to the driving shaft the pull exerted by the reacting against the revolvable head, and a device for transferring saidpull from the driving shaft to the casing.

2. A soot blower adapted to be entirely reinovedfrom a. boiler or furnace forusein another boiler `or furnace and structurally independent thereof, said soot blower having a tubularmeinber adaptedto be inserted through a tube leading tothe combustion chamber of 'a boiler, a hollow shell revolvably andv slidably carried inside the tubular ineinber, a steam tight packing interposed between the shell and tubular member, a head supported by said shell and progecting out of one end of the tubular member and provided with `an obli uelr dis osed 'et-forininfrnozzle a casing having a steam inlet and `attached to the otherend of the tubular member, a driving` shaft rotatably supported inv the casing, a flenifile shaft connected to the shell and the driving shaft, thefleiible shaft transferring to the driving` shaft the pull exerted by the steam reacting against the ievolvable head, and a device transferring said pull from the driving shaft to the casing. y

3. A, sootblower adapted to be entirely removed from a boiler or furnace for use' in anotherboiler or furnace and structurally inshaft connected to the shell and the driving l shaft, the flexible shaft transferring `to the driving shaft thefpull exerted by the steam reacting against the revolvable head, and a device for transferring said pull from the driving shaft to the casing.

t. A soot blower adapted to be entirely removed frein a boiler or furnace for use in another boiler or furnace and structurally independent thereof, said soot blower having a tubular member adapted to be inserted through a tube leading to the combustion chamber of a boiler, a hollow shell revolvably and slidably cariied inside the tubular inemi ber, a steam tight packing interposed between the shell and tubular member, a head supported by said shell and projecting out of one end of the tubular member and having a iet` iii the casing, a flexible shaft connected tothe shell and the driving shaft, the flexible shaft transferring to the driving shaft the pull exerted by the steam reacting against the revolvable head, and a'device for transferring said pull frein the driving shaft to the casing.

5. A soot blower adapted to be entirely removed frein a boiler or furnace for use in another boiler or furnace and structurally independentlthereof, said soot blower having a tubular member adapted to be inserted through a `tube leading to the combustion chamber of a boiler, a hollow shell revolvably and slidably carried inside the tubular membei, a steam tight paclring interposed between the shell `and tubular member, ahead supported by said shellaiid projecting out of one endof the tubular member and having a jetforming nozzle, a casing having a steam inlet and attached to the other end of the tubular member, a driving shaftiotatably supported in the casing in line with the tubular inember, operating means for the driving shaft, a flexible shaft connected to the shell and the driving shaft, the flexible shaft transfe ring to the driving shaft the pull exerted by the steam reacting against the revolvable head, and a device for transferringsaid pull from the driving shaft to the casing.

G. A soot blower adapted to be entirely re# moved-from a boiler or furnace for use in anotherboiler or furnace and structurally independent thereof, said soot blower having an outer casingprovided with a steam inlet, an operating shaft extending into the casing, a nozzled head extending out of the casing and revolvably carried thereby, and driving connections between the operating shaft and the head, said connections including a flexible

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