US1140956A - Superheater for boilers. - Google Patents

Description

G. COOK.

SUPERHEATER FOR BOILERS.

APPLICATION FILED MAR. 1.5, 1913.

l mm mu Patented May 25, 1915.

Q53 9% w 1 r ermine.

GEORGE COOK, OF BUFFALO, NEW YORK.

SUPEBHEATER FOR BOILERS.

Lil 4 49356.

Application filed March 15, 1913.

To all whom it may concern:

Be it known that I, GEORGE COOK, a citizen of the United States, residing at Buffalo, in'the county of Erie and State of New York, have invented certain new and useful Improvements in Superheaters for Boilers, of which the following is a specification.

My invention relates to superheaters for boilers and it has for one of its objects, the provision of novel superheating flues within the boiler associated with return steam flues extending into said superheating fines and so arranged and connected that the steam, in its course from the dome of-the boiler to the steam cylinders, is divided into a coitsiderable number of small bodies and subjected to the hot gases passing through said super-heating fines, thus assuring the superheating of the steam in a most effective manner.

Another object of my invention, is the provision of a chamber common to all steam flues, so constructed and supported that the steam flues can be easily reached when found necessary to make repairs.

Still other objects are to provide means for regulating the admission of steam to the steam cylinders at a point within the smoke chamber or box of the boiler, so as to reduce to;a minimum the possibility of leakage of steam from the boiler; to provide a shut-off valve in the smoke chamber or box of the boiler; to provide a novel regulating valve; and to otherwise improve on superheatcrs now in 'use.

l/Vith these objects inview, my invention consists in the novel features of construction, and in the arrangement and combination of parts to be hereinafter described and particularly pointed out in the subjoined claims.

In the drawings,-I*igurc 1 is a central longitudinal section of a portion of a locomotiveiequipped with my invention, Fig. 2 is a transverse section taken on line fwcu, Fig. 1. Fig. 3 is a vertical section taken on line wzv, Fig. 1, on an enlarged scale. Fig. 4 is an enlarged horizontal section taken on line y-y, Fig. 2. Fig. 5 is a horizontal section taken on line zz, Fig. 2.

Reference now being had to the drawings in detail, similar numerals are employed to denote similar partszin the several figures.

The reference numeral 6 designates the boiler shell which is herein shown as part of a locomotive boiler but it will be appar- Specification of Letters Fatent.

' Patented May 25, 1915.

Serial No. 754,452.

ent that my invention may be embodied in any other type of boiler.

The boiler shell is provided with the usual steam dome 7 into which extends one end of a steam supplypipe 8. From the steam dome, pipe 8 extends forwardly and passes through the forward fiue or tube sheet 9 of the boiler and forward of said fine or tube sheetit is equipped with a hand operable valve 10 whose stem 11 extends outside of the boiler shell and has a hand wheel 12 for conveniently operating the valve. Said stem is packed in a stulling box extending through said shell so that the valve may be retained in steam-tight condition at all times from the exterio" of the shell. This valve is therefore located in the smoke chamher or box 13 of the boiler and while it is operable from without the shell, it requires no packing at the shell against escape of steam, as is invariably the case owing to the shut-off or regulating valve being situated in a steam space and having its operating mechanism passing through the confining wall of such space.

Connecting the forward flue or tube sheet 9 with the rear line or tube sheetfli are the usual fire tubes 15, and in connection with these fire tubes I employ a series of fire tubes 16, which are of somewhat larger diameter than the tubes 15 and are preferably termed super-heating iiues since they are specially provided to assure effective heating of the steam in its passage to the steam cylinders. The superhcating flues occupy the space generally taken up by common fire tubes, such as shown at 15, and like these fire tubes, are open at both ends and expanded or otherwise secured in the flue or tube sheets of the boiler. These superheating flues are reduced in diameter at their rear ends, as at 17, so as to provide a restricted entrance portion for each flue having a cross-sectional area somewhat smaller than the cross-sectional area of the remainder of the flue, but as the remainder of the flue has inserted therein steam coils or return pipes to be hereinafter described, the steam space within each flue is of substan tial] y the same cross-sectional area throughout almost the entire length of the flue. In

least two sections 18, 19; the section 18 having its forward end passing through the forward flue or tube sheet 9 and terminating in a plane just-forward of the same, said end having a circumferential flange 20 bearing bolts 21 passing through a circumferential 'flange on section 19 and taking lnto said flue sheet.

The forward end of the steam supply pipe 8 (which is also the forward end of section 18, as exemplified) has connection by a ground joint with a transversely-disposed housing or casing 22, which is divided by a other an outlet chamber.

partition or wall 23 into two parts or chambers 2d, 25, one an inlet chamber and the This-housing or casing is herein shown as of rectangular formation but may have any-form desirable. The .inlet chamber24: is in rear of the outlet chamber 25 and has a central extension at its upper end through which and a circumferential flange 26,0n the forward end of the steam supply pipe 8, bolts 27 are passed, to which nuts 28 are applied which impinge against the front face of said central extension, said .bolts maintaining a steam tight connection between the steam pipe 8 and said housing by reason of the impinging portions of both being ground and drawn tightly together by said bolts.

29 designates steam pipes which are connected to the rear wall of the inlet chamber 24 of said housing or casing and extend into the super-heating flues. The pipes within each superheating flue comprise two sets of return pipes, one set being arranged above the other and connected within the superheating fiues by means of elbows 30, and each set of return pipes comprises an inlet pipe andan outlet pipe, the inlet pipes with in each superheating fiues being connected to the inner chamber of said housing or casing by afitting 31 having two branches-for connection to said inletpipes and a single cylindrical portion common to both branches and adapted for connection with said inlet chamber by a ground fit. The return pipes within each superheating flues are also connected with said housing or casing and communicate with the outlet chamber thereof through steam passages 33 cored out through bosses passing through the inlet chamber. The connection of the return pipes are made by means of fittings similar to those for the inlet pipes the inlet and return pipes of all superheating flues and are held in' steamtight connectionby means of a presser plate ti l-through which and the hous ng orcasing bolts are passed to' securely connect said pipes to said casing.

, superheating fiues.

Depending centrally from the housing or casing 22 is a pipe 35 which has connection at its lower end with a horizontally-disposed pipe 86 adapted to lead to the engine cylin: ders arranged at oppositesides of the boiler. lVithin this horizontally-disposed pipe is a double controlling valve 37 having two valve members 38 connected by .a hollow tube 39,

as all necessary, packing can be done from the exterior of the shell. Said valve has connection by means of suitable levers 43 with any convenient operating device with- .in the engine cab. By reason of the two' valve members being connected by the hollow tube 39 the pressure on opposite sides of the valves is equalized, thus assuringfreedom in action and the throttling of the steam to a nicety. It will be apparent from the foregoing that the valves for controlling or throttling the steam are entirely outside of the steam space of the boiler, and conse quently there is no possibilit y of escape of steam from the boiler directly by reason of loose or insui'licient packing, and if it is desired to repair the superheater, the steam may be easily shut off at the valve 44: and

the desired repairs made without difiiculty.

To assist in making repairs I have ar-- ranged to permit of moving the housing or casing 22 forward and at the same time provided for swinging the same in an upward direction. lVith a view of preventing undue strain on the pipe connections, saidhousing or casing is supported in a manner to permit of such forward and swinging movement. after disconnecting the several pipes therefrom. To accomplish this I provide a pair of rails 45 spaced apart and secured to hangers 46 fastened to the shell of the smoke box, and at each end of the hous- 1ng or cas1ng a lug i'fis provided through which is passeda screw hanger 48 having an eye 49 at its upper end and nuts 50 which impinge against the upper and lower sides of said lugs. Engagin the rails 45 are g ooved wheel's 51wh'ic1 are rotatable on links 52having their lower endsconnected to the eyes 49 of said hangers. These links may swing on-the axes of said grooved wheels an d. the hangers 48 may swing on the lower ends of said links, thus assuring the necessary freedom in action to permit of;

readily moving the housing or casing forward and swinging the same upwardly away from the steam pipes arranged within the It is clear therefore that the steam pipes may readily be removed from the heat fines for repairs, and that the heat fiues are also accessible when the housing or casing is swung forwardly.

Having thus described my invention, what I claim is,

1. A superheater for boilers comprising a casing divided transversely into an inlet chamber and an outlet chamber, one arranged in advance of the other, a series of steam pipes arranged in pairs and secured to said casing, each pair comprising an inlet pipe and an outlet pipe, a fitting for connecting the inlet pipes of each two pairs of steam pipes with said inlet chamber, and a fitting connecting the outlet pipes of each two pairs of steam pipes with said outlet chamber.

The combination with a boiler having a series of superheating fiues, a housing or casing in the smoke box of said boiler and comprising an inlet chamber and an outlet chamber in advance of said inlet chamber, means for leading steam from the steam space of said boiler in the said inlet chamber, means for delivering steam from said outlet chamber, two pairs of steam pipes extending into each superheating flue, a fitting connecting the inlet pipe of each pair of steam pipes with the outlet pipe thereof, a fitting connecting the two inlet pipes of each two pairs of steam pipes with the inlet chamber of said housing or casing, and a fitting connecting the outlet pipes of each two pairs with the outlet chamber of said housing or casing.

3. The combination with a boiler having super-heating fiues secured to the forward and rearward flue sheets, and a smoke box in advance of said forward flue sheet, a housing or casing within said smoke box spaced from said forward flue sheet, said housing comprising an inlet chamber and an outlet chamber, a steam supplypipe connecting said inlet chamber with the steam space of said boiler, return steam pipes connecting said inlet chamber with said outlet chamber, a steam delivery pipe depending from said outlet chamber and branching laterally in opposite directions, a stuffing box extending through the shell of said smoke box and accessible for packing from the exterior; a valve controlling the delivery of steam through said branches, and

operating mechanism for said valve extending through said stuffing box.-

4. The combination with a boiler having a series of superheating fines, steam pipes extending into said fiues and having their inlet and outlet ends terminating in the smoke box in advance of said flues, a housing or casing having an inlet chamber and an outlet chamber in advance of said inlet chamber and separated therefrom by an intervening wall, said housing having said steam pipes detachably connected therewith, a steam supply pipe detachably connected with said inlet chamber, a steam delivery pipe detachably connected with said outlet chamber, a pair of rails supported within the smoke box,wheels adapted to travel on said rails, and adjustable connection between said housing or casing and said wheels whereby said housing or casing is supported when said pipes are detached therefrom.

5. The combination with a boiler having a series of superheating flues, steam pipes extending into said fines and having their inlet and outlet ends terminating in the smoke box in advance of said fines, a housing or casing having an inlet chamber and an outlet chamber and having said steam pipes detachably connected therewith, a steam supply pipe detachably connected with said inlet chamber, a steamdelivery pipe detachably connected with said outlet chamber, a pair of rails supported within the smoke box, rollers mounted to travel on said rails,'links carried by said rollers and capable of swinging thereon, and screw sup ports pivotally connected to said links and adjustable within said housing or casing.

6. The combination with a boiler having a steam delivery pipe and two branches connected to said delivery pipe at a common point and leading therefrom in different directions, of two valve members adapted to control the delivery of steam into said branches, said valve members being connected together to act in unison and provided with means to assure equalized pressure thereagainst from said two branches.

In testimony whereof I have affixed my a signature in the. presence of two subscribing witnesses.

GEORGE COOK.

Witnesses:

EMIL Y NEUHART, JACOB ()BERsr, Jr.

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