US735427A - Steam-boiler. - Google Patents

Description

PATENTED AUG. 4, 1903.

J. I. THORNYOROPT.

STEAM BOILER.

APPLICATION FILED MAY 12, 1899.

N0 MODEL.

W w Q 1 Ma M? m: Nonms PETERS COfFNOTO-LITHOY, WASHINGTON. o. c.

1 UNITED STATES Patented August 4,1903

PATENT OFFICE.

STEAM-BOILER.

SPEGIFIGATIQNforming part of Letters P atent No. 735,427, dated August 4, 1903.

Application filed May 12, 1899. Serial No. 716,484. (No model.)

To all whom it may concern:

Be it known that 1, JOHN ISAAC THORNY- CROFT, a subject of the Queen of Great Britain and Ireland, residing at Church Wharf, Ohiswick, in the county of Middlesex, England, have invented Improvements in Steam- Boilers, of which the following is a specification. 1 i r According to thisinvention in a water-tube steam-boiler of the so-called. Daring type (see Thornycrofts patent, No. 452,401) there are provided externally of the casing downflow-tubes which connect the upper steam and water vessel-with the outer lower water vessels. Also the smallersteam-generating tubes which connect each of the outer lower vessels with the upper vessel are so disposed that some of them form two flues, in which the other tubes are located, and the products of combustion from each'fire-box pass partly' into the lower part of an inner flue formed by tubes and partly intothe lower part of the corresponding outer fiue formed by tubes.

The products of combustion risingwithin each inner flue and the corresponding outerflue' unite in the upper part of the outer flue and flow thence through channels formed by and between suitable walls or casings tothe chimney, the arrangement being such as to. pro

tect that part of the wall of the upper vessel.

which is above the water-levelfrom the d i rect action of the products of combustion.

For the purpose of enabling my invention onjthe line as w of Fig. 2looking toward the.

front end of the boiler, and Fig. 2shows'a side elevation of the boiler. l p

The boiler here represented by way of example comprises an upper steam and water nal downflow-tubes 6, arranged at intervals (in one or more rows) in the length of the boiler, while external downflow tubes 7', which are arranged at the front end only of the boiler, connect the lower part of the upper vessel to the upper parts of the lower vessels 2 2 The smaller of the bent tubesviz., 4--which connect the central lower vessel 2 and the upper vessel 1, enter the latter at opposite sides of the longitudinal center of the boiler. These tubes are arranged in rows, whereof the two inner rows L -4'. e., those nearest to the vertical plane of the longitudinalcenter of the boilerand the two outer rows 4 z'. e., those next to the fire-box 3-are bent to form (excepting as to their ends) tube-walls which constitute flues 8, wherein theinterveuing tubes 4 are arranged in rows. The two inner walls formed by the rows of tubes 4 serve to protect from the direct action'of the products of combustion the before mentioned down flow-tubes 6, whereby the upper andcentral lower vessels 1 and 2 are connected, and which tubes are located within a central chamber 8, formed between the two inner tube-walls. .Each of the outer lower vessels2 2 -is connected with the upper vessell also by several rowsof tubes, whereofthe two outer rows 5 and the two inner rowstBare made to form (excepting as to the ends of the tubes) walls of a flue 9, within which the remaining tubes 5 are arranged in rows.

The outer wall of each inner flue 8 and the inner wall of each outer flue 9 meet at a suitable distance above the fire-grate, as at 10.

The lower portions of the tubes constituting these respective walls are so arranged as to provide-spaces 11 between the wall-tubes, whereby products of combustion can enter the respective fines 8 and 9, up which they flow. The upper portions of the tubes of both walls of each outer flue 9 and those of the outer wall of each inner flue 8 are arranged to afiord spaces 12 between those portions of the said tubes for the upward flow of the products of combustion in directions at tions of the tubes. The arrangement is such ICO that the hot gases which have ascended within'the inner flues 8 join, in the upper. portions of the outer flues 9, the hot gases that have ascended within the said fines 9. From this locality the gases pass away to the chimney 13 through suitable channels 14, formed by and between walls or casings and 15*. The inner of these walls or casingsviz., 15 is arranged at some distance from the outer surface of the top portion of the upper vessel- 1, so as to protect that part of the said vessel from the direct action of the products of combustion.

16 is the ordinary boiler-casing.

Within the upper vessel 1 there are or may be plates 1 for deflecting water and steam, also plates 1 for deflecting water and steam from the downflow-tubes 6, and an arrangement for separating from the steam water that has been carried up with the steam. The steam-separating arrangement can be of various kinds, but may advantageously consist of inner and outer longitudinal pipes 17 and 18, arranged concentrically one within the other, so as to leave between them. an annular space or chamber 19, that is in communication with the interior of the vessel 1 through slits or openings at 20 in the outer pipe 18 and with the steam -main through slits or openings at 2L in the inner pipe 17, a longitudinal partition 22 separating the two sets of slits or openings 20 and 21, and one or more openings being also provided in the outer pipe 18 at 23 for conducting water that has become separated from the steam in the space or chamber 19 into a casing or box 24, whence it can flow by a pipe 25, having a non-return valve, into the water-space of the vessel 1, as more fully described in Letters Patent No. 657,968, granted to me'September 18, 1900.

What I claim is 1. A water-tube steam-boiler comprising an upper vessel for water and steam, three lower vessels for water, external downfiow watertubes connecting the front portion of the uppervessel to the front portion of each of the two outer lower vessels, downflow-tubes arranged along the boiler from the upper vessel to the central lower vessel, and smaller tubes connecting the upper vessel to each of the lower vessels.

2. Awater-tubesteam-boilercomprisingan upper vessel for steam and water, three lower vessels for water,.external down flow-tubes located at the front end of the boiler whereby said upper vessel is directly and separately connected to each of the two outer lower water vessels, internal downtake-tubes connecting the upper vesselto the lower central vessel, two'inner sets or bundles of small tubes arranged to connect opposite sides of the upper vessel to the lower central vessel, and two outer sets or bundles of tubes arranged to connect opposite sides of said upper vessel to the two outer lower vessels, substantially as described.

. 3. A water-tube steam-boi ler comprising an upper vessel for steam and Water, three lower Vessels for water, external downflow-tubes 10- cated at the front end of the boiler whereby said upper vessel is directly and separately connected to each of the two outer. lower water vessels, two inne'r sets orbundles of small tubes arranged to connect opposite sides of the upper vessel to the lower central vessel and to form a central chamber between them, two outer sets or bundles of small tubes arranged to connect opposite sides of said upper vessel to the two outer lower water vessels, and downtake-t-ubes arranged along the boiler from the upper vessel to the central lower vessel and located within said central chamber, substantially as described.

4. A water-tube steam-boiler comprising an upper vessel for steam and water, three lower vessels for water, external downfiow-tubes located at the front end of the boiler whereby said upper vessel is directly and separately connected to each of the two outer lower water vessels, internal downtake-tubes connecting the upper vessel to the lower central vessel, two inner sets or bundles of small tubes arranged to connect opposite sides of the upper vessel to the lower central vessel, two outer sets or bundles of small tubes arranged to connect opposite sides of said upper vessel to thetwo outer lower water vessels, and an uptake located above the upper vessel and the upper ends of said tubes, spaces being left between the upper ends of said small tube whereby hot gases can pass upward direct to said uptake, substantially as described.

5. A water-tube steam-boiler comprising an upper vessel for water and steam, three lower vessels for water, external downtlow watertubes connecting the front portion of the upper vessel to the front portion of each of the two outer lower vessels, downflow-tubes arranged along the boiler from the upper vessel to the central lower vessel, two sets or bundles of small tubes connecting the central lower vessel with the two sides of the upper vessel, some of the tubes of each set forming tube-walls whereby two flues are constructed one at each side of the central longitudinal vertical plane of the boiler and an intermediate central chamber in which are located the said internal down flow-tubes, and a set or bundle of tubes between each outer lower water vessel and the corresponding side of the upper vessel, some of the tubes of each set or bundle constituting tube-walls which form at each side of the boiler an outer flue containing some of the tubes of the set or bundle, substantially as described.

6. Awater-tube steam-boiler comprisingan upper vessel for water and steam, three lower vessels for water, external downflow watertubes connecting the front portion of the upper vessel to the front portion of each of the two outer lower vessels, downflow-tubes arranged along the boiler from the upper vessel to the central lower vessel, two inner sets or bundles of small tubes connecting the central lower vessel with the two sides of the up per vessels, two outer sets or bundles of small between the lower ends of the tubes of said walls and also between theupper ends of the tubes constituting both walls of each outer flue, and between those constituting the outer wall of each inner flue, substantially as described for the purposes specified.

- 7. A water-tube steam-boiler comprising an upper vessel for water and steam, three lower vessels for water, external downflow watertubes connecting the front portion of the upper vessel to the front portion of each of the two outer lower vessels, one or more downflow water-tubes between said upper vessel and the lower central vessel, two inner sets or bundles of small tubes connecting the central lower vessel with the two sides of the upper vessels, two outer sets or bundles of small tubes connecting the outer lower water vessels to the two sides of the upper vessel, some of the tubes of each set or bundle constituting inner and outer tube-walls of a flue containing other tubes of the set or bundle, and fire-boxes one at each side of the longitudinal center of the boiler, said fireboxes being formed each by and between the inner wall of the outer flueand the outer wall of the inner flue, which walls meet to form the top of the fire-box, and openings being formed between the lower ends of the tubes of said walls and also between the upper ends of the tubes constituting both walls of each outer flue, and between those constituting the outer wall of each inner flue.

8. Awater-tube steam-boilercomprisingan upper vessel for steam and water, three lower vessels for water, fire-grates between said lower vessels, separate external downflow wa ter-tubes connecting the front portion of the upper vessel to the front portion of each of the two outer lower vessels, two inner sets or bundles of small tubes connecting the upper vessel to the lower central vessel and two inner sets or bundles of small tubes connecting the upper vessel to the two outer lower vessels, some of the tubes of each set or bundle being arranged to form a flue in which other tubes of the set or bundle are arranged and which is provided with inlets at the bottom and outlets at the top and the four sets or bundles being arranged to form the sides and top of two fire-boxes above said grates and a central chamber, downtake-tubes arranged along the boiler from the upper vessel to the lower central vessel and located within said central chamber, and an uptake located above the upper vessel and the outlet from the pairs of flues at each side of the central longitudinal vertical plane of the boiler, substantially as described.

9. In a water-tube steam-generator,the combination with an upper vessel for steam and water and steam-generating tubes connected thereto, of an uptake located over said vessel and the upper ends of said tubes, and a shield located above the top of said vessel and mainly at a distance therefrom and within said uptake, substantially as described for the purpose specified.

10. In a water-tube steam generator, the combination with an upper vessel for steam and water, and steam-generating tubes connected to said upper vessel at each side of the central longitudinal plane of the boiler, of an uptake located over said upper vessel and the upper ends of said tubes, and a shield or deflector arranged above and mainly at some distance from the upper portion of said vessel and so as to form with the sides of the uptake guiding-passages for products of combustion escaping upward from between said tubes, substantially as described.

11. In a water-tube steam-boiler, the combination with an upper vessel for steam. and water, lower water vessels, downflow-tubes connecting said upper and lower vessels, uptake-tubes connected to the lower vessels and to the two sides of said upper vessel and arhot gases escaping from the flues can pass to' said chimney without coming in direct contact with the top of said upper vessel, substantially as described.

Signed at 77 Oornhill, in the city of London,

England, this 21st day of April, 1899.

JOHN ISAAC THORNYOROFT.- Witnesses:

WM. 0. BROWN, HUGH HUGHES.

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