US742847A - Water-tube boiler. - Google Patents

Description

PATENTED- NOV. 3, 1903.

W. J. DUGAN- WATER TUBE BOILER.

APPLIOATIQR rum) mu 1, 1903.

I0 MODEL.

m: uomus FFl'cRs co., PhOTO-L'TNO. WASHINGTON. a. c.

Patented November 3, 1 903.

PATENT OFFICE.

WILLIAM J. DUGAN, OF KANSAS CITY, MISSOURI.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 742,847, dated November 3, 1903. Application filed May 1,19o3. Serial No. 155.113. (No man.)

To all whom it may concern:

Be it known that I, WILLIAM J. DUGAN, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Vertical VVater-Tube Boilers, of which the following is a specification.

This invention relates tovertical water-tube boilers, and has for its object to produce a boiler of the type mentioned whereby steam can be generated quickly, which is accessible for repairs and cleaning, and which is of simple, strong, durable, compact, and comparatively cheap construction.

With these objects in view the invention consists in certain novel and peculiar features of construction and combinations of parts, as hereinafter described and claimed, and in order that it may be fully understood reference is to be had to the accompanying drawings, in which- Figure 1 is a vertical central section of a boiler embodying my invention. Fig. 2 is a horizontal section on the line II II of Fig. 1. Fig. 3 is a horizontal section of a modified form of the boiler as viewed downwardly. Fig. 4: is a horizontal section of the type of boiler shown in Fig. 3, but with the section taken in a plane just above the topmost flue and looking upward.

Referring to the drawings in detail, 1 designates the foundation portion of the boiler, and 2 the grate thereof.

3 is the cylindrical inner shell, forming the combustion-chamber and provided with an annular crown-sheet 4, from which centrally depends a large tube 5, closed at its lower end and provided with a drain-pipe 6, leading off through the shell and equipped externally thereof with a valve 7.

Near its upper end shell 3 is provided with a series of short fiues 8, which project outwardly through the boiler-shell 9, said boiler by preference concentrically surrounding the combustion-shell and secured to the latter by the base-ring 10, the opposite ends of fines 8 being of course upset or expanded in the usual or any preferred manner.

11 designates alarge number of water-tubes arranged radially by preference, as shown, and projecting at their opposite ends through shell 3 and tube 5, a workman, who is lowered or lowers himself into tube 5, upsetting or expanding the inner ends of the tubes from that position. The outer ends are upset or expanded in the customary manner through the hand-holes 12, which are afterward hermetically sealed in the customary manner by the hand'hole devices 13. This construction obviously enables the person in control to easily and quickly clean the tubes or to replace a defective one.

14 is a fuel-door controlling the opening leading through shells 3 and 9 to the combustion-chamber, and 15 is a manhole in the crown-sheet of the boiler, through which the workman enters for the purpose of making internal repairs of the character mentioned or of any other character. Said manhole is controlled by the usual devices, as at 16.

17 designates perforated steam-pipes disposed in the dome portion of the boiler and connected to the coupling 18 at the end of the steam-distributer pipe 19, the latter extending through the top of the boiler.

20 designates a circular band secured to the boiler and forming the bottom of a cylindricalshell 21, the same being provided with a conical top 22, through which extends pipe 19. This top is provided with a large opening 23, registering by preference with opening 15 and controlled by a suitable door 24, and connected to the upper end of the top is a smokestack 25 to carry off the products of combustion, which pass from the combustion-chamber out through lines 8 into the smoke-box, comprising portions 20, 21, and 22, above referred to.

In operation the boiler is filled to approximately the water-line, (indicated in Fig. 1,) so that the Water shall completely surround the combustion-chamber and the combustionflues 8 and, furthermore, shall be thoroughly circulated, and thereby raised to the necessary temperature more quickly, because it fills the large tube 5, which, depending into the combustion-chamber, is subjected to a' heat as intense as the water-tubes 11. The steam thus quickly generated is, in effect, superheated until its escape by way of the steam-pipe 19 by the smoke-box surrounding the upper part of the boiler and protecting it from the outside air above its water-line.

In Figs. 3 and 4 I show a boiler to develop a much smaller horse-power than the other, this boiler comprising the two shells 3 and 9, with the former communicating directly with the smoke-stack 25 and with the tubes 11 extending clear across the combustion-chamber, with their opposite ends upset or expanded by introducing an expander through hand-holes 12, as hereinbefore explained, and in this connection it should be stated that the fireman or engineer is capable of replacing a defective tube in either of these boil ers with a perfect one, and thus is enabled to save not only the cost of such work, but the time frequently required to get skilled labor when needed. The construction shown in Figs. 3 and 4, it will be seen, is analogous to that of Fig. 1, except that the former is provided with no smoke-box inclosing the dome portion of the boiler and with no tube 5 for the purpose of permitting the inner ends of tubes 11 to be expanded and for the further purpose of providing additional heatingsurface for contactwith the water.

With the boiler shown in Fig. 3 of coinparatively small diameter the tubes 11 are not sufliciently long to be objectionable, and the water is converted into steam with sufficient rapidity without the additional heating-surface represented by said tube 5.

From the above description it will be apparent that I have produced a vertical water-tube boiler which is sufficiently accessible for repairs and cleaning by the fireman or engineer, which provides for rapid circulation of water and generation of steam,

which occupies a comparatively small space,

and cheap construction, and while I have illustrated and described the preferred embodiments of the invention it will be apparout that it is susceptible of modification as regards its form, proportion, detail, construction, and arrangement of the parts without departing from its essential'spirit or scope or sacrificing any of its advantages.

Having thus described the invention, what I claim as new, and desire to secure by Letters Patent, is-

A vertical water-tube boiler, comprising a combustion chamber having an annular crown sheet, a tube depending from said crown-sheet into the combustion-chamber and having its lower end closed, a valve-controlled drain-pipe communicating with said closed end, a boiler surrounding the combustionchamber, and provided with controlled handhole openings, tubes extending through the combustion-chamber in line with said handhole openings and communicating at their opposite ends with the boiler and said depending tube, a fuel door controlling access through the boiler and combustion-chamber to the latter, a steam-pipe communicating with the boiler, and a smoke-stack com municating with the combustion-chamber.

In testimony whereof I affix my signature in the presence of two witnesses.

- WILLIAM J. DUGAN.

Witnesses:

H. C. RODGERS, G. Y. THORPE.

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