US460839A - Feed watee heater foe steam boilees - Google Patents

Description

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J. BAIRD. FEED WATER HEATER FOR STEAM BOILERS.

No. 460,839. Patented Oct. 6, 1891.

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FEED WATER HEATER FDR STEAM BOILERS. No. 460,839. Patented 0ct.6, 1891.

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J. BAIRD. FEED WATER HEATER FOR STEAM BOILERS. No. 460.839.

Patented 0011.6,1891.

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JOHN BAIRD, OF NElV YORK, N. Y.

FEED-WATER HEATER FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 460,839, dated October 6, 1891.

Application filed April 13, 1891.

T0 aZZ whom it may concern.-

Be it known that I, JOHN BAIRD, mechanical engineer, a citizen of the United States, residing at No. 824: Lexington avenue, in the city, county, and State of New York, haveinvented certain new and useful Improvements in Feedater Heaters for steam Boilers, of which the following is a specification.

My invention more especially relates to feed-water heaters for steam-boilers of the class having horizontal or slightly-inclined fines. Its object is to secure a compact and efficient boiler adapted to make ample steam of high pressure in a comparatively small space, which ends I attain by certain novel organizations of instru men talities hereinafter specified.

The accompanying drawings show my improvements adapted to a locomotive-boiler exemplified in United States Letters Patent No. 54,973, granted to me August 26,1890, representing, however, so much only of the apparatus as is necessary to illustrate the subject-matter claimed. Unless otherwise indicated the parts are of usual approved construction and ordinary operation.

Figure 1 is a plan, and Fig. 2 a vertical central longitudinal section on the line 2 2 of Figs. 1 and 3. Fig. 3 is a front elevation; Fig. at, a vertical transverse section on the line 4 4 of Fig. 1, and Fig. 5 a similar view on the line 5 5 thereof.

Short unfeathered darts indicate the directions in which the sections are shown, dotted arrows show the direction of the water-circulation, and solid arrows the course of the products of combustion.

The fire-box end of the boiler I term the front; the opposite, the back or rear end. That side on the left of a person facing the fire-box I call the left, the opposite, the right.

A firebox A, provided with gratebars ct,is shown as connected by a back head I with the front tube-sheet of the lower shell B, through the fire-tubes b of which the products of combustion pass into the uptake A and chimney A The front or feed-door end of the boiler is composed of two parallel sheets of metal constituting a front head or water-space D, provided with tire-doors (7.

Serial No. 388,658. (No model.)

The sides and top of the fire-boXcons-ist of a series of transverse arched water-tubes C,

.placed close together side by side and exupper ends with the front head and extend .ing backward to a point, say, about threefourths of the distance between the front and back heads, where they are bent downward, reaching to the bottom of the fire-box, their lower ends being connected by small pipes f to the water-leg at the bottom of the tubesheet. the fire-box, so as to afford access at each side to the front connection of the tube-sheet. These tubes preferably lie in front of the firetubes.

The iire-box,itwill be observed, is wider than the lower shellof the boiler, and the upper portion of the space obtained by this increased width is utilized by arranging therein longitudinal water-tubes II, connecting the front head with the tube-sheet or back head I, they being preferably connected to the inner sheet of the front head and passing through packed water' tight sleeves in the back head with which they are connected by small tubes h, as shown in United States Letters Patent No. 425,970, grautedto me April 22, 1890. An upper shell K is shown as extending over the fire-box and lower shell. It is connected with the front head by pipes J,

These tubes are arran ed centrall in for the passage of mingled steam and water mentioned, the steam rises through the water in the upper shell to its steam-space in the upper part thereof. The front head D and water-boxes E are connected by suitable staybolts 6 to resist longitudinal strains.

IOO

The organization above described is substantially that of my Patent No.4=34,97 3 above mentioned.

In order to carry out my present invention, I lengthen the uptake or smoke-box A and surround it with a double shell, constituting a water-space M, into the left-hand side of which the feed-water is shown as flowing througha pipe m, provided with a check-valve m. A pipe m connects the upper part of the opposite side of this water-space with a water-box N, extending transversely across the uptake about or above the normal water-line of the upper shell. A series of pendent open-ended tubes at are shown as arranged in two parallel rows across the uptake and is inclosed in larger. concentric tubes 02, closed at their lower ends but connected at their upper ends with lower channels N, connected with the upper part of the lower shell by the water-inlet pipes N which enter opposite sides of the boiler. The products of combustion, it will be observed, in passing through the back connectionor uptake impinge against theinner walls of the waterspace M and circulate freely among the pendent water-tubes before escaping up the chimney, thus thoroughly heating the feed-water.

The boiler is of course to be supplied with the most approved appliances, including safety-valves,-st-eam, water, and air passages, and

valves for filling, working, and emptying the I boiler.

I do not broadly claim herein the combination, with boiler-fines, of pendent watertubes, as similar devices are described and claimed in sundrypending applications heretofore filed by me, as follows: Serial No. 383,096, filed February 27, 1891; Serial No. 383,854,1i1ed March 5,1891; Serial No. 384,736, filed March 12, 1891; Serial No. 386,335, filed March 25, 1891, and Serial No. 387,747, filed April 6,1891.

I claim as of my own invention- 1. lhe'combination, substantially as hereinbefore set forth, of a boiler-shell, its firetubes, its back connection or uptake, a waterspace inclosing it through which the feedwater flows, an upper channel, a lower channel, feed water-circulation pipes pendent therefrom in the uptake, a water-passage connecting the water-space and channels, and feed-water pipes connecting the channels and boiler.

2. The combination, substantially as hereinbefore set forth, of a fire-box, a boiler-shell directly in rear thereof, its fire-tubes, an uptake or back connection into which they open, a feed-water space surrounding the uptake, channels extending transversely over the up"- take at or above the normal Water-line of the .boiler, pendent concentric water-circulating pipes connecting the channels, and watering across the back connection, concentric pendent feed-water-circulation tubes in the uptake or back connection connecting said channels, and water-passages connecting the water-space and channels with the lower boiler-shell.

In testimony whereof I have hereunto subscribed my name.

JOHN BAIRD. Witnesses:

ADDISON W. BAIRD, THOMAS BAIRD.

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