US761713A - Water-tube steam-generator. - Google Patents

Description

PATENTED JUNE 74, 1904. G. RESTUCGI. WATER TUBE STEAM GENERATOR.

APPLIOATIONTILED SEPT. y15, 1902.

z SHEETS-SHEET 1.

NO MODEL.

THE- NonRls PTERS co.. PHoTo-Lrmo., WASHINGTQN. D. c.

EATENTED JUNE 7, 1904.

y G. -REsTUGG-I.`

WATER TUBE STEAM GENERATOR.

APALIOATION FILED SEPT. 15, 1'902.

2 SHEETS-SHEET 2.

N0 MODEL.

yIO

` end in a cylindrical surface a.

UNITED STATES Patented June 7, 1904.

PATENT GEETCE.,

WATER-TUBE STEAM-GENERATOR.

SPECIFICATION formingpartoi' Letters Patent N0. 761,713, dated June 7, 1904.

Application filed Septembei 15, 1902. Serial No. 123,544. (No model.)

T0 all whom, t may concern:

Be it known that I, GIUSEPPE REsTUccI, a

Asubject of the King'of Italy, residing at Naples, Italy, have invented certain new and useful Improvements` in VVater-Tube Steam-Generators for Autocars and the Like, (for which I have applied for Letters Patent of the Ki ngdom of Italy under date of March 1, 1902; in France June 16,' 1902; in Germany June 21, 19.02, and in Great Britain June 18, 1902, No. 13,862,) of which the following is aspecication. 4

This invention relates to an improved watertube steam-generator for autocars and the like.

In the accompanying drawings, Figure 1 is a vertical section of the apparatus; Fig. 2, a horizontal semisection made at the level of the collector,and'Eig. 3 a horizontal semiseetion made at the level of the grate.

The steam-generator which forms the object of the present invention has been more particularly designed for steam-autocars and also for any applications for which a rapid-steaming boiler is required of small bulk, but having a large heating-surface and one which is strong, sure in action, and capable of being easily dismounted and repaired. All theparts of the boiler and their connections have therefore been studied, so as to realize these objects.

The vaporizing arrangement consists, essentially, of a group of tubes of small diameter (indicated in the accompanying drawings by t) curved into the exact form of concentric arcs of circles and arranged perpendicular to the plane of rotation of the grate and terminating at the upper end in the coneshaped surface of a vessel Z and at the lower These two terminal surfaces constitute two plates in which the said tubes z, are fixed, being bent in an arc of a circle between said surfaces, as described. The tubes /t enter these plates, as shown in AFigl 2- c'. e., in positions such that the tube ends in one row are out of line with those in the next two rows, both laterally and circumferentially, like the squares `in a chessboard looked at from corner to corner, so that the flame and hot gases of combustion must pass round all the tubes in rising to the upper part of the group of tubes. This arrangement and form of tubes enables a large heating-surface to be obtained ina very limited space, and, further, the circular form of the tubes facilitates their construction and cleaning, as well asrepairs and replacements of parts of theJ apparatus.

A hollow column o is screwed at the lower end of the vertical cylindrical part a of the metallic structure to which the group of steamtubes is fixed. VA grate g, having its walls w of {ire-clay, is revolubly mounted on the vertical column oand has a rotary movement imparted to it by means of an endless screw g/ when the car or any other traveling arrangement in which the boiler is employed is moving. Owing to this rotary movement, all the parts of the grate come successively opposite a hopper for feeding the fuel and provided with a door-for closing it. This special arrangement of the furnace enables an automatic and regular charging to be obtained without requiring a stoker, thus effecting a considerable economy in the cost and the supervision of the fire.

Below the grate there is a fixed ash-pan c, and thejgrate revolves, bearing on the upper edge of the ash-pan, into which the air enters by natural draft or is forced mechanically by any suitable means, such' as a fan orthe like. The combustion-chamber, which is the annular part surrounding the column 0, immediately above the masonry of the grate g has its casing formed of a tube or series of tubes s, coiled spirally, which arey traversed from the bottom to the top by the feed-water for the boiler, which passes through the coil after descending the hollow column o and rising by a pipe e, of which the said column s is only a' continuation. This coil s represents a first casing and wall of the boiler, and while preventing the iiame from coming into direct contact with the external sheet-.metal casing and from heating it to redness it acts as a means for recovering the heat which would otherwise be lost by radiation and which is utilized in this manner for heating the water and converting it into steam.

It may at once be stated that the water in the generator circulates normally in the following manner: The feed-water which enters IOO by a feed-pipef passes into a coil t, formed by this pipe f, and placed round the steam-chamber .e travels through the coil and is heated by the hot gases of combustion which rise up to it in endeavoring to escape by the chimney, (and this forms another means of recovering the heat.) The water thus partially heated flows from pipef into the generator through chambers Z and m and passing through a central cylindern reaches the central column o, mounts in the pipes e, circulates from bottom to top through the coil s, which surrounds the combustion-chamber, and is discharged from the rising tubes into the collector Z. Here the water is carried onward mechanically by the circulation produced by thesmall tubes ZL, is freed from the generated steam, (which rises, by means of superheater-tubes Z1, to the steam chamber or reservoir 2,) and passing through the holes formed in the wall of the central cylinder a (which holes are seen in Fig. l) the water again enters the chamber m, keeping always at the same level therein.

A structure g of mild cast-steel, the upper part of which forms the steam-chamber e', is Xed by means of bolts and nuts Z above the conical plate which carries the tubes Zt, and the steam passes to the motor by a steamport p. The communication between the col-v lector Zand the steam-reservoir is formed by a series of superheater-pipes Zi, which are connected in the highest zone of the conical plate hereinbefore mentioned and are then curved upward and connected with the steamchamber, as shown in Fig. l. These tubes Zt' serve for drying and superheating the steam and conveying it into the chamber e. The separation between the water and the steam is in this manner perfect, and the steam passes to the motor not merely dry, but already super-heated. It must be pointed out that this advantage is obtained without complicating the construction of the generator and without increasing its total dimensions, because one end of the said tubes Zr? is inserted in the spaces containing tubes ZZ, and the other end follows the wall of the generator, as may be seen in Figs. l and 2.

The construction may be modified by malring the cylindrical chamber a closed at the bottom, and also the grate may be lixed be of any suitable form and arranged on suitable system. 'A

The whole of the apparatus is inclosed ina very slight sheet-metal casing, and the exit el the gases of combustion into the atmosphere takes place at the top through one or more holes formed in the said casing and which discharge horizontally or vertieall y.

The opening of the chimney into the outer air may be provided with an extractor actuated by the displacement of the air due to the movement of the vehicle.

rlhe apparatus may be taken apart in order to allow of the diii'erent parts being inspected and cleaned with the greatest ease and rapidity and without requiring special knowledge. All that is necessary is to re move the nuts Z1 and to unscrew the column o for taking the apparatus to pieces.

Having now fully described my said invew tion and the manner in which the same is to be performed, 1 declare that what VI claim as my invention isv 1n combination, the water-containing vessel Z, a steam containing vessel above the same, a vessel m in said vessel Z, a central column in communication with vessel m for the passage of water therefrom, a rotary grate surrounding the lower part of said column, pipes c connected to the column below said grate and extending upwardly beyond the sides of the grate, a coil s connecting with the pipes e above the grate and forming` the wall of the fire-box, a connection between the coil and the vessel Z, a steam connection between the upper part of the vessel Z and the steamchamber, a water-inlet pipe coiled around said steam-chamber and comnnuiiczuzingl with the vessel fm, openings w connecting said chamber 'la with the vessel Z, curved pipes /l` connecting vessel Z with the central column, and means for rotating the grate, substantially as described.

1n witness whereof l have hereunto set my signature in the presence of two witnesses.

GIUSEPPE R, lCS'lU CCI and any

Witnesses: Y

SALvA'rou VoLrY, GIULIO VARRDAL.

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