US1719327A - Boiler - Google Patents

Description

J. H. FOX

July 2, 1929.

BOILER Filed Sept. '7, 1927 lKHEIEHINEIII! INVENTOR JHIFOX Patented July 2, 1929.

JONAS H. FOX, 01? SEATTLE, WASHINGTON.

. i BOILER.

Application filed September 7, 1927. Serial No. 217,952.

This invention relates to improvements in boilers and more particularly to a fire tube boiler of the externally fired type, wherein the fire box is surrounded by water legs which, at their upper ends, communicate with the. boiler proper and which form the walls of a fire box.

It is the principal object ofthe present invention to provide a horizontal, fire tube boiler of the above character embodying certain novel features in water leg construction whereby an accelerated and more satisfactory circulation of water is produced than in the ordinary construction, so that quicker heating and greater boiler efficiency is obtained.

Other objects of the invention reside in the various details of construction and in the relation of parts whereby the above results are accomplished and whereby a commercially practicable and very desirable boiler is produced. 1

In accomplishing these objects, I have pro vided the improved details of construction,

' the preferred forms of which are illustrated in the accompanying drawings, wherein- Figure 1 is a view, shown one-half in transverse vertical section and one-half in front elevation, of a boiler constructed in accordance with the present invention;

Figure 2 is a longitudinal, vertical section of the same.

Referring more in detail to the drawings-- The boiler, as illustrated, comprises a horizontally disposed, cylindrical shell, or boiler portion proper, designated by reference numeral 1, which is closed at its opposite ends by flue sheets 2 and 3. Communicating with the boiler at its opposite sides, also at the front and rear ends, are water legs, presently described in detail, which form the walls of the fire box or combustion chamber 1; this being provided at the front end with the usual opening 5 for firing.

The cylindrical body portion 1 contains the spaced apart upper and lower sets of fire tubes extending from end to end there of through the flue sheets 2 and 3. The lower set of tubes, designated by numeral 6, lead forwardly from an auxiliary combustion chamber 7 provided in open communication with the rear end of the main fire box between the rear Water leg and lower rear end portion of the boiler, and open into a smoke box 8 at the front end of the boiler, while the upper set of tubes 9 lead rearwardly from the smoke box 8 and into a rear smoke box, or flue connection, 10.

The water legs at the sides and ends of the fire box, or furnace, are formed by spaced apart, inner and outer plates 1112 joined in spaced relation by stay bolts 13, and are welded, or otherwise suitably fixed, to the boiler shell. The water legs at the opposite sides ofthe boiler, which are designated at 15, communicate with the interior of the boiler 1 through a plurality ,of spaced apart, vertical slots 16 provided inthe opposite sides of the boiler shell. The Water leg at the front, designated at l'r', opens directly across its entire end, as at 18, into the front end of the boiler, while the water leg 19, at the rear, is set back somewhat beyond the boiler end providing the combustion ehamher 7, and at its upper end is curved over gradually so as to terminate in a horizontally directed portion 20 which is joined with the rear fluesheet 3 and which opens into the boiler through a horizontal slot 21 that ex tends substantially the width of the boiler at just below its diametrical center and in alinement with a horizontally extending space that is left between the upper and lower sets of fire tubes.

The most important feature of this invention resides in the construction of the rear water leg and its relation to the boiler. It

readily apparent that, since the direction of circulation of water will correspond to the direction of the travel of flame or heat, there will be a greatly accelerated circulation of water upwardly through the rear water leg, because of the travel of heat upwardly along this leg and into the fire tubes. Water circulating upwardly through this leg will discharge into the boiler through the slot 21 with an accelerated flow which will carry it to or well toward the forward end of the boiler. In its forward flow it will be distributed laterally to the slots 16 for passage to the side water legs for re-circulation back to the rear and again up through the rear leg and into the boiler.

lVhile it is well known that boilers of a type having connecting water legs at sides and ends and forming the fire box have been used for many years, it is thought to be new in the art to construct the rear water leg, with the laterally curved upper end portion, as shown in Figure 2, and to so connec t it rwith'the boiler that the inflow 0t water from this leg into the boiler, accelerated by the application of heat thereto and further the same manner as the front legof the present type is shown, resulting in a vertical upfiowof water from the leg into the boiler with an eddying effect and a retarded circulation.:, V e y a "The present boiler, because of the hori- 'zontal discharge oztfwater from the leg 19,

and the unrestricted space between the upper and lower sets of tubes into which this water'is del1vered, efi"ects a rapid and effective circulation that results in quick and etfective'heating with a minimum fuel consuniptioir.

Havin g thus described my invention, what I claim as new therein and desire to secure by Letters Patent, is:

A horizontal fire tube boiler oi: the character described having an upper and a lower set of tubes slightly spaced apart to leave an intermediate, unrestricted area said shell being provided across one end with a horizontal opening alined with said unrestricted area, water legs connected at their upper ends with the shell at its opposite ends and sidesand forming the walls of a tire box; the legs at opposite ends of the box being adapted, respectively, to contain downwardly and upwardly circulating water with the leg which carries the upwardly eireulating water curved gradually at its upper end from vertical to a horizontal direction and connected to the shell through said'horizontal end opening so that the [low of water therefrom will be unretardcd and delivered horizontally into the shell.

Signed at Seattle, \Vushington, this 22nd day of August, 1927.

- JONAS H. FOX.

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