US1465118A - Means for regulating water circulation in water-tube boilers - Google Patents

Description

- Aug; 14,1923.

I 1,465,118 S.E.DESCHER MEANS FOR REGULATING WATER CIRCULATION IN WATER TUBE BOILERS Filed Feb. 6, i920 QIMVENTOR.

WITN ESSES Patented Aug. 14, 1923.

urrs sra'r SAMUEL E. nins'onnnfor rrrrsBune-rr. rnnnsrnvemn.

'MEANS FOR BEGUIiATiN'GWATEP-i CIRCULATIGN I'll' WATEB-TlJBE BOILERS.

Application iiiearebru r efiea o; sem no. saw/s.

To all whom it mag concern Be it known thatv I, SAMUEL Drnsornna a citizen of the United States, and a resi dent of Pitts-burgh, in'the county ot Allegheny and State of Pennsylvania, made ,a

new and useful Invention in. Meansior tubes of water tube boiler. V

p Anobject of the invention is to produce means for regulating the flow of water through individual tubes of the boiler, which i is capableofbeingeasily fitted to and easily removed from' the tube.

A further object is-to produce means for regulating or modifying the circulation of waterthroughlindividual tubes of the boiler, which is so arranged and so constructedthat it forms in effect a director or separator for separating the steam and, the water issuing from such tubes of the'boiler as enter the steam liberating space of the boiler at-anangle and for directing the water and-steam in separate paths of flow. i '1 These and other objects wh'ch.will be 'made apparent throughout the further description of the invention are attained by means of apparatus embodying the features herein described and illustrated. Inth'e drawings accompanying and-forminga part of this applicatiom Figure l is a side elevation of a flow restricting device or plug embodying my invention and shownin connection with a fragmental sectional view of the tube sheet through which the'water tubeprojects; V

Figure '2 is a sectional view line 22 of Figure 1. j V Figure 3 is an end view of theflow restricting device or plug shown in Figures 1 and2. i

The circulation of water through cachindividual tube of a water tube boiler is ependent somewhat upon the inclination and location of the tube in the boiler. For example, those tubes which are subjected to the most heat and those which stand most nearly verticalpare subjected to a rapid circulation along the of the water. An unduly rapid circulation through certain of the tubes of a water tube boiler is objectionable since it occasions priming in the steam drum and as a result the boiler delivers wetinstead of steam free of moisture.

Boilers ordinarily give'the best performance, from the stand point of quality of steam delivered, while operating between certain. definite limits above normal rating. When the boiler is operating outside of said limits it is apt to deliver steam of objectionable quality, since while the circulation throughout the entire boiler may be accel erated it carries a greater percentage of water in relationto the steam and consequently theflow through certain tubes of the boiler is apt to be objectionably high inthe quantityof water carried with the steam. Thisdiiiiculty may be obviated by employing a flow restricting device in connection with such tubes of the boiler as are subjected to an undue acceleration of the water and steam traversing them. My present invention consists in the, production of a flow restricting device which may be readily and easily associated with a tube of the boiler for the purpose of checking the flow through the tube.

In Figure 1 of the drawing, 1 have somewhat diagrammatically illustrateda water tube 4 projecting through a tube sheet 5 and flared at the end as is customary in con necting the tube to the shellof the header. The tube is shown equipped with a flow re stricting device or plug 6, which is not only oapableof checking the flowthrough it but is so equipped that it to some extent functions asla separator in that it,directs the steam issuing from the tube, upwardly along the tube sheet and directs the water down- Wardly. In this connection it may be said that vertical water tube boilers generally have the tubes s0 arranged that the greatest quantity of steam is generated in such tubes of the boiler as enter the steam liberating space of the top drum at an inclination, in some cases so great as to be almost horizontal, and that where I have referred to the separator action of the plug 6 1 refer to its action when associated with such tubes. 7 j

As illustrated, the plug 6 consists of a head portion or cap 7 and a shank or body portion 87 The body portion is so tapered that the device may be fitted to thetubc by merely driving it into the opened and flared end. In addition the taper is such thatthe device may bereadily removed from the tube when removal is necessary. As shown llO V the tube.

the shankiis provided withthree ijadiating fins 9, which extend longitudinally and are so located with relation to each other that each extends in a radial direction et -an angle 0.1": substantially 120 to each of the otherfins. Each fin is shown as decreasing; in width and radialthickness from the. head towards the opposite end of the shank. -With this arrangement the shank is in effect tapered from the head towards the other end and may therefore be easily-inserted into'the end of the tube and when so inserted into three separate passages of substantially equal cross sectional area." The dimensions of the plug 6. are such that when the shank is drivento place in the endof a tube, the head 7 stands away 'from the end of the tube a suilicient amount'to provide a delivery space of adequatearea tor the three spaces 't'ormedby its'insertion' in The shank may be so formed that eachfin will provide a fluid or-liquid dirooting surface which will change the direction otthe How of thefiuid-or liquid is suing from the tube with a minim-um amount 0t friction and shock. This may be accomplished by employing liberal fillets atv the junction of the finswith the head. Thehead portionis shown provided with an outerconvex face so that the plug-may be driven home witha hammer with little danger ofbreaking' the head oiithe shank or 0t fracturing the head. 7 In inserting the plug into a tube, it is-desirable to solocate the fins with reference to the tube that one fin points downwardly since this will provide two water delivery spaces 10 onthe lower side of the tube and one steam delivery space ll o n*the upper side of the tube. lVith such an -arra-rrg;e ment, the natural tendency of the steam to rise is accentuated, and the steam is directed upwardly as previously described. 'The cap 7 standing away from the end of thetube as shown in li 'in ure,lrendersit easy.to-remove the plug when the tube with which it is associated needs cleaning, since the head may be employed in the operation of il'reeing' the plug; from the tube.

In the drawings 1 have shown the plugfi equipped with means for holding it in place within the tube, so as to prevent it from beinc; blown out in case it becomes loosened by vibrations of the boiler or for other reasons. As shown the plug is provided with a snap ring 13 which encircles-the radiating fins and is located at a point substantially midway the length Oil? the shank. As shown a slot 14: is provided in the face of eachfin 9 for the reception of the snap ,ring. The

ring is of such dimensions that it will engagethe slots 14 and at the sametimebe place in a tube. theplug. the. ring. is placed over the small divides the delivery end of the tube held into gripping engagementwith the inner face of the tube when the plug 15 in In mounting the ring; on

end of the shank and forced along the ta- 7 pered fins untilitsnaps into. the slots. The outer face of the ring is shown rounded. This facilitatesthe operation of inserting: the ring and shank into the tube since the rounded face causes the ring to ride over such "shoulders as may be formed on the inner surface ot the tubeduring the operation of securing it tothe tube sheet. The flare at the end-of'thetube accommodates the en trance of the ring. By employing such rings there is n'odanger of the plugs jarringloose,-nor oft-heplugs being blown out of the tubes.

fItw-ill-be-apparent that the dimensions of the plug may be varied' tor-thepurpose ot restricting the fiow througlrthe tubes the desired amount, that the plugs may be made cit-cast iron or any suitablermetal.

*Whilel have described but one embod} ment'of my'inventionyit will be apparentthat various changes, modifications, auditions, oromissions may be made in the plu illustrated without departing "from the spirit and scope of my invention asset-forth by the appended 1 claims.

What I claim is: p r

1; A flow restricting plugfor boiler tubes having three si ibstantially equally spaced and radially extending tube engaging fins, each-having a-slot thereinand alsnap ring located in said slots and-adapted to engage the inner face of thetube iwhen the plug is inplaee -i-n a tube.

2. A flow restricting .plug'adapted to-bef inserted into. a-evater -tiibe of a boiler coro prising a drivinghead'and sin-integrally formed shank having aring-engaging slot formedtherein, anda; snap ring surroundins said shank and engaging said slot and the inner face of the tube when the plug is in place-inn tube.

In combinationwith the delivery end of a water tube of a boiler, a tlow-restrict ing plugprojecting into the flared end or the tube, comprising a shank having sub stantially radiallyexten'ding fins, eaclr having a" slot 'formed therein, and aheadintegrally formed with said'shank andstanding away =f-rom the end of the tube so to provide ;a water delivery space: between i the tube and the hea'd, and a"snap ringlocated in said slot and adapted to engage the! inner face-of'tl1e*tube when the tube is inpl ace in theslot. Y

In-testimony whereof, I ?have hereunto subscribed my name this 3rd day; of February, 1920. q v SAMUEL BDIESQHER.

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