US1229787A - Feed-water heater or superheater for fire-tube boilers. - Google Patents

Description

J. W. PURVIS & L. W. STEEVES. FEED WATER HEATER 0R SUPERHEATER Toa FIRE TUBE BoTLERs.

Patented June 12, 19W.

APPLICATLON FILED DEC. l5, 1915..

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1. W. PURVIS L L. W. STEEVES FEED WATER HEATER on SUPERHEATER .EUR ETRE TUBE BGTLERS.

- APPLICATION FILED DEC. I5, ISIS.

7 Patented Ju11e12, i917.

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INVENTORS Jbhn/ Wlwww, l1@ w Wim/6.5,

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JOHN W. PURVIS, OF DETROIT, AND LORNE W. STEEVES, OF JACKSON, MICHIGAN.

FEED-WATER OR fSUI'EIIELHLATER FOR FIRE-TUBE BOILERS.

Application yile'. December 15, 1915.

Britain, residing, respectively, at Uetrcit,`

county of lVayne, and at Jackson, in 'the county of Ja'cxson, an'd State of ll/lichigan,`

have invented ra new an'duseful Feed-later Heater or Sifip'erheater for Fire-Tube Boilers, of which the following a specification.

rlhis invention has reference to a fee'd water heater for fire tube boilers. also 'capable i of use as a. superheaten and its object is to provide an efiicient 'feed water heater of such flexibility as to be readily adapted to different re tube boilers either of the locomotive type 'or of other types.

In accordance with the present invention there is provided a heater made up of or dinary and special fittings jointed together in a manner permitting the alining' fof the fittings or arranging them in more Ior less sinuous shapes with diverting tubes adapted to 'enter chosen ones of the fire tubes of the boiler, whereby the products of combustion are forced into closer Contact with the walls of the fire tubes and are likewise brought into intimate contact with the water diif'erting tubes, so that the products of combustion are accelerated in their flow through the fire tubes, thus keepii'i'g the tubes cleaner than usual and the feed water is heated even up to4 boiler pressure tem` perature.

The heater may beA used either as a feed water heater or as a superheater, though' not intended for both uses at one time except inthe case that two of the heaters be employed.

box, thus 'avoiding cumbersome fixtures on the outside of the boiler. No exhaust steam being used for heating purposes all of the exhaust steam is utilizable for producingV Specification of Letters Patent.

Then the heater is used on a traction boiler it 'is inclosed in the smoke Patented J une l2, 19M.

Serial No. 67,023.

this specification. with the further understanding that while the drawings show a practical forni of the invention, the latter is not confined to any ,strict conformity with the showing yof the drawings, but may be changed and modified so long as such changes and modifications come within the scope 'of the appended claims.

ln the drawings 11H Figure l is a longitiidinal 'section of a heater vcontaining a restricted number of parts'.

Fig. 2 is a 'plan view 'of a structure such as shown in Fig'. l but co'i'itziining a greater number of parts.

V3 'a' section o'n the line of Fig. 1..

Fig. d is a section 'on the line .Jr-l of Fig. 1.

Fig. 5 is a section 'on the line of Fig. l.

Fig. 6 is a view similar to Fig. l but showing a somewhat modified construction.

Referring" to the dra'wings,there is shown a small portion of an end plate l of 'a boiler, and also fire tubes 2i, which may be assumed to open into the smoke box of a locomotive or traction lengine boiler.

The attachment is made up of suitable nun'iber ofV special fittings 3 with end fittings 4, 5, respectively, the litting et constituting an inlet fitting and the fitting 5 constituting an 'outlet fitting. The fitting 3 has oppositely directed faces 6, at respectively opposite ends. Each litting 3 is eloi'igaterl from one end toward the other and is comparatively narrowlVithin one end of the fitting is a passage `or clmml'ier 8 having a. continuation `9 at 'one end opening through the face G in a direction substantially perpendicular thereto. The other end of the litting has an interior chamber opening by way of a passage ll through the face 7 in a direction substantially perpendici'ilar thereto. The chamber 8 is joined to the chamber 10 by a passage 12 communicating' by another passage '13 with aneck 1J: opening through one wall of the fitting and internally threaded, as indicated at l5. The chamber 10 opens through an internally threaded neck 16 in alinement with the neck 14. The passage lhas 'diametrically opposite matching longitudinal flanges 17 each with a longitudinal groove 18 opposite the corresponding groove of the other flange, and these grooves enter the neck 14. EX-

tending from the fianges 17 toward one side of the passage 12 is a web 19 separating the passage l2 from the neck 16 up to the grooves 1S.

The fitting 3 is formed on the side opposite the passage 9 with an internally threaded lug 20 designed to receive one end of a threaded rod 21.

The inlet fitting 4 is provided with an internally threaded neck 22 for receiving a water inlet pipe 23 and the fitting 4 at the end remote from the neck 22 has a face 23 with a passage 24 therethrough and matching the shoulder 6 and passage 9 of the fitting 3. The threaded rod 2l extends through the passage 24 and the corresponding wall of the fitting 4 and at the end remote from that entering the lug 20 the rod receives a cap nut 25, whereby the fitting 4 is secured to the fitting 3 in any angular relation thereto about the longitudinal axis of the rod 21, but with the fitting 4 in free constant communication with the chamber 8 of the fitting 3.

The neck 16 has a screw plug 26 applied thereto and this plug is provided at its inner end with a lug 27 which, when the plug is screwed tight, is in close relation to the corresponding face of the web 19.

There are as many fittings 3 provided as may be desired, and the face 7 of each tting 3 is applied to the face 6 of the next fitting in order, a screw rod 21 entering the threaded or socket lug 20 of such next fitting in order, while a cap nut 25 applied to the screw rod 21, which is extended through that wall of the fitting 3 o posite the passage l1, serves to clamp the fiorst fitting 3 to the second fitting 3, and similar arrangement is provided for joining the other fittings 3 in end to end arrangement. By this means a continuous tortuous passage is established for water through the series of fittings 3. The outlet fitting 5 has a threaded neck 28 for the reception of an outlet pipe 29 and is provided with a face or shoulder 30 designed to fit against the face or shoulder 7 of the last fitting 3 in order. A threaded rod 21 entering a threaded socket formed in a lug 20a on the fitting 5, and a cap nut 25 applied to the other end of the rod in a manner similar to the cap `nuts .for the other fittings complete the joinder ofi' the fitting 5 to the last fitting 3 in order.

Screwed into each neck 14 is one end of a tube 31 of' a size to enter a corresponding fire tube 2 with its outer walls in spaced relation to the inner walls of the fire tube. That end of each tube 31 remote from the neck 14 has applied to it a closing having the end remote from the tube 31 conical, as shown at 33, or of other suitable shape to offer small impediment to the fiow of fiuid past it. The exterior portion of plug 32 the plug 32 has outstanding wings 34a thereon of a spread sufiicient to snugly yet freely fit the interior of the tube 2 so as to centerl the tube 31 therein. Extending lengthwise of the tube 31 is a web 34 of approximately the internal diameter of the tube 31, so as to snugly fit therein. One end 35 of the web 34 is laterally expanded, so as to enter the grooves 18. lVhere the expanded portion 35 joins the body of the web 34 shoulders 3G are formed, and these shoulders rest upon the upper end of the tube 31, thereby sustaining the web 34 within the tube 31.

The web 34 with its end continuation 35 serves as a diverting member causing water entering the chamber 8 to pass through the tube 31 along one side of the web 34 to that end of the web adjacent to the plug 32, the web stopping short oft' such plug and the water then finds escape in a return direction through the tube 31 along the other side of the web 34 to the chamber 10, such diverting of the course of the water occurring in each section of the heater where provided with a tube or water leg 31 entering a fire tube 2.

The heater may be supplied with as many fittings or sections 3 as may be desirable. Such a heater is readily fitted to the fire tubes of different styles of boilers, since each fitting or section is readily arranged at any desired angle to the other fitting or fittings because each fitting is jointed to the neighboring fittings, and hence may be turned upon the axes of the rods 21 to bring the tubes 31 into centering arrangement with the fire tubes 2, such centering being facilitated by the presence of the wings 34.

Where two or more water legs 31 are employed there is a corresponding number of fittings 3. In Fig. 1 it is assumed that but two fittings 3 are employed, while in Fig. 2 four such fittings are indicated, and since the tubes 31 are in alinement with the plugs 26 it follows that the structure of Fig. 2would be provided with four tubes 31. The showing of Fig. 2 indicates an arrangement whereby a heater having four diverting tubes 31 may be arranged so that these tubes enter corresponding fire tubes with the whole structure in compact form. In the event of the fire tubes being otherwise arranged the heater is readily conformed to such arrangement by the simple expedient of loosening the cap nuts 25, readjusting the sections 3 with relation to each other, and then tightening the cap nuts.

In the drawings it is assumed that the joints between the fittings are pressure tight joints either by having the meeting faces ground, or by the employment of suitable packing gaskets, as is customary, both means of insuring tight joints being commonly employed.

The Whole structure is readily assembled or dismantled and also readily varied in size, and, aside from the inlet and outlet fittings, necessitating but one kind of fitting, this being the fitting 3 with the parts carried thereby. The heater is readily enlarged by simply adding more fittings 3 With the parts belonging to these fittings, or the heater may be reduced in size by omitting the fittings 3 and parts carried thereby.

Fig. 6 shows a structure in moet part similar to the structure of Fig. 1 except that instead of the grooved fianges 1T and web 19 there is a web 19a having a passage 12n therethrough in line with the passage closed by the plug i6, and seated in this passage is an expanded or bell end 36 of a pipe 37, the other end of which pipe is also expanded as shown at 38 to center such end of the pipe in the Water tube 3l. In order to avoid restriction of flow of Water from the tube 31 into the pipe 37 the end 38 of the pipe is slotted, as shoivn at 39, for an appropriate length. The expanded end 36 has its extremity swaged over,'as shown at 40, to engage the web 19 and the pipe 37 is held closely to its seat on the web 192l by the lug 27 on the plug 26.

In other respects the structure of Fig. 6 corresponds to the structure of Fig. 1 and Where the parts are alike the same reference numerals have been used so it is unnecessary to repeat the description of the structure with respect to Fig. 6.

1V ith either form of the heater thenstructure is readily applied vto different forms of boilers since its capability of adjustment permits fitting it to different makes of boilers Where the centers of the boiler tubes vary in distance one from the other.

Then water is forced through the heater it enters through the fitting 4, and follows a somewhat tortuous path through the fittings 3, and then is diverted into and returns from the water legs through the tubes 31 Where 'the Water is subjected. to close contact with the hot fuel gases. Because of the constriction of the fire tubes by the presence of the tubes 31, a higher speed of flow of the fuel gases is caused and accumulations deposited from the fuel gases are avoided, so that the fire tubes remain cleaner than otherwise. Moreover, the hot gases are brought into more intimate contact with the Walls of the fire tubes and the boiler Water is thus better heated. Furthermore, the hot gases are also brought into intimate contact With the feed water flowing through the Water legs with the resultant that the feed Water may be heated to a higher temperature 0r even to boiler pressure temperature before entering the boiler, thus reducing strains to a minimum.

As circumstances demand sections may be added or taken awa-y in order to get the desired temperature and the heaters may be set up in multiple to get the desired quantity.

The feed Water heater is productive of ,greater efficiency of the boiler and consequently its use permits the employment of a larger engine than Would otherwise be the case.

That is claimed is:-

1. A feed Water heater comprising a series of fittings pivotally connected together with certa-in of the fittings provided with ivater legs adapted to enter the fire tubes of the steam boiler in spaced relation to the Walls thereof, the course of the Water through the fittings and through the water legs being in one continuous series.

2. A feed Water heater comprising a series of fittings pivotally connected together With certain of the fittings provided with Water legs adapted to enter the fire tubes of the steam boiler in spaced relation to the Walls thereof, and said fittings having connecting means about which the fittings may be turned into different angular relations one to the other, the course of the Water through the fittings and through the water legs being in one continuous series.

3. A feed Water heater consisting of a series of fittings pivotally connected end to end in a continuous series With terminal fittings adapted to receive inlet and outlet connections for feed water and each of the intermediate fittings being provided with an extension constituting a water leg of a size to be inserted in a fire tube of a boiler, the course of the Water through the fittings and water legs being in one continuous series.

4i. A feed water heater comprising a series of connected fittings each with a passage therethrough and at the meeting ends having matching engaging faces with pivot connections about which the fittings may be set one relative to the other into different angular relations, certain of the fittings being each provided With a Water leg adapted to enter a fire tube of the boiler, the course of the Water through the fittings and water legs being in one continuous series.

5. A feed Water heater comprising a series of connected fittings each with a passage therethrough and at the meeting ends having matching engaging faces with pivot connections about which the fittings may be set one relative to the other into different angular relations and certain of the fittings being each provided with a Water leg adapted to enter afire tube of the boiler, said Water leg comprising a tubular member connected at one end to the fitting and at the other end provided with a closing and centering means, and means Within the tube for directing Water entering the tube into outflowing and return streams and constituting a division means between the inlet and outlet ends of the fitting, the course of the water through the fittings and water legs being in one continuous series.

(i. In a feed water heater, a heating unit comprising a fitting with a water passage therethrough with the ends of the fitting shaped for swivel connection to the corresponding ends of other fittings, and Water diverting means carried by the fitting and lodged within and projecting to one side of and beyond Said fitting', said Water diverting means being adapted to lodge in a lire tube of a boiler.

7. In afeed water heater, a heating unit comprising a fitting with a water passage therethrough with the ends of the fitting shaped for swivel connection to the corresponding ends of other fittings, and water diverting means carried by the fitting and projecting to one side of said fitting, said water diverting means being adapted to lodge in a fire tube of a boiler, said Water diverting means comprising a tube of smaller diameter than the fire tube in which it is to lodge with a closure for the end of the tube remote fromv the fitting, said closure having outstanding portions for engaging the inner walls of #the iire tube to center the water tube and said water tube having means for diverting a stream of water from one end of the fitting lengthwise through the water tube and in a return direction along said water tube to the other side of the fitting.

8. In a feed water heater, a heating unit comprising a fitting with a water passage therethrough with the ends of the fitting shaped for swivel connection to the correspending ends of other fittings, and water diverting means carried by the fitting and projecting to one side of said fitting, said water diverting means being adapted to.

lodge in a fire tube of a boiler, said water diverting means comprising a tube of smaller diameter than the fire tube in which it is to lodge with a closure for the end of the tube remote from the iitting, said closure having outstanding portions for engaging the inner walls of the fire tube to center the water tube and said water tube having means for diverting a stream of water 'from one end of' the fitting lengthwise through the water tube and in a return di rection along said water tube to the other side of the fitting, said fitting having means of' access to the interior thereof in line with the water tube for the introduction and re inoval of the water diverting means within the water tube.

9. A feed water heater comprising aL series of like units each with ua water passage therethrough and a side extension of said water passage adapted to be housed in a re tube of a boiler, the opposite ends of each fitting being oppositely directed with relation to the length of the fitting to engage the corresponding ends of other fittings, each fitting being provided with a pivot pin at one end adapted to extend through a corresponding portion of the next tting in order, and a cap nut for each pivot pin.

10. A feed water heater comprising a series of water circulating units each with a side extension constituting a water leg adapted to enter a fire tube of a steam boiler, with the units having their ends in meeting swivel relation, and pivotal means for holding the meeting ends in such swivel relation to permit the elongation and contraction of the heater and the location of the water legs to enter differently related fire tubes.

11. A feed water heater comprising a series of water circulating units each with a side extension constituting a Water leg adapted to enter a lire tube of a steam boiler, with the units having' their ends in meeting swivel relation, and pivotal means for holding the meeting ends in such swivel relation to permit the elongation and contraction of the heater and the location of the water legs to enter differently related fire tubes, said water heater having terminal fittings constituting inlet and outlet members for the water heater with the passages through the fittings and through the water legs in continuous serial relation.

In testimony1 that we claim the foregoing as our own, we have hereto affixed our signatures in the presence of two witnesses.

J OI-IN W. PURVIS. LORNE W. STEEVES.

Witnesses:

L. S. MCCANN, H. K. BAKER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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