Improvements in Steam Generators.
Year: 1892

page_text: Date of Application, 18th Oct., 1892-Accepted, 31st Dec., 1892
COMPLETE SPECIFICATION.
Improvements in Steam Generators.
I, FRANCIS EDWIN HOSMER of 182 M. Street South Boston, Suffolk County
Massachusetts, United States of America, Mechanical Engineer, do hereby declare
the nature of this invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
This invention relates to certain improvements in steam generators.
The object of the invention is to provide an improved steam generator,
exceedingly cheap, simple and durable in construction and composed of a minimum
number of parts to attain the end of producing a maximum quantity of steam with
a minimum consumption of fuel. The particular object of the invention being to
produce an improved generator wherein the circulation of water is rapid and almost
if not quite perfect.
The invention consists of certain novel features of construction and com-
binations of parts more particularly pointed out hereinafter and specifically set
forth in the claims.
The accompanying drawing represents a sectional elevation of the improved
generator.
In the drawings the reference letter a, indicates the outer shell or casing of the
boiler provided with a suitable gauge b. This shell or casing is closed at the
top and bottom. e indicates the inner shell of the boiler forming also the fire
pot and combustion chamber within the tank of the boiler, and extending upwardly
à suitable distance therein and terminating in the uptake d, extending up through
the interior of the boiler and out through the top thereof to convey off the
products of combustion; e, indicates the grate at the lower end of the fire box.
, indicates the opening through the boiler into the fire pot for the introduction
of fuel. g, indicates the water line in the boiler; indicates the steam space
at the upper end of the boiler; j indicates the feed water pipe and i, indicates
the blow off pipe. From the drawings it will be observed that the water in the
boiler completely surrounds the fire pot, except of course, at the bottom;
k, indicates a series of coils located in the upper part of the fire pot. Each coil
of pipe is preferably independent and the coils of the series are parallel and
closely nested and each coil of pipe extends from the outer edge inwardly and
upwardly so that the coil is in the form of a truncated cone.
Each coil is supplied
with water from the lower part of the boiler by a pipe l, opening into the boiler
near the lower end of the boiler and extending upwardly within the fire pot to
the outer loop of the coil. The water then passes in the coil upwardly towards
the centre of the fire pot and from the upper end of the coil passes upwardly
through vertical pipe m extending up through the centres of the series of coils
through the lateral bend n above the coils into the upper portion of the
boiler through the inner shell thereof. The water uptake pipes m, from the
various coils are clustered in the open centres of the series of coils as shown
and the supply pipes for the series of coils are arranged around the wall of the
fire pot as shown.
The many and great advantages of this arrangement and construction are
obvious. The water in the coils is almost instantly vaporized, and passes rapidly
towards the centres of the coils and upwardly at the same time thereby facilitating
the flow thereof, and then upwardly through the pipes m, n, into the upper portion
of the boiler. This action draws the cold water down in the boiler into the pipes
and then up through the coils. Great advantages are attained by the peculiar
shape and arrangement of each coil and by having each coil provided with a
separate inlet and outlet connecting respectively with opposite ends of the boiler,
whereby each coil forms a separate circuit through which the water passes from

page_text: the top of the boiler to the bottom and then up through the coil and its connecting
pipes. Great advantages are attained by having the vaporizing pipes or coils
connected with opposite ends of a large body of water in the boiler so that a free
passage is formed for the downward movement of water caused by the flow up
through the coils and pipes. The vaporizing coils and pipes are so formed and
arranged that the vapor as fast as generated can pass up almost instantly and
without retardation so that the water can pass in immediately and take its place.
The object being to create as rapid a flow as possible through or over the heating
surfaces whereby a maximum generation of steam is produced.
The various parts and members of this boiler can be readily and easily dis-
connected for repairs or interchanging.
One great point of advantage in this case is the gradual upward extension of
each coil at the same time that it extends inwardly towards the centre. By this
peculiar arrangement much desired advantages are attained in the increased and
rapid circulation.
Of course it is obvious that any desired number of coils can be employed and
that this peculiar arrangement of coils opening at opposite ends into a water
column or tank can be applied to various kinds of boilers other than that here
illustrated, and that various changes might be made in the form, construction and
arrangement of the parts described without departing from the spirit and scope of
my invention, hence I do not wish to limit myself to exactly what is here shown
and described.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The herein described steam generator.
2. A steam generator provided with a series of independent vaporizing coils, each
independently connected at opposite ends with a water column or tank so that
a complete circulation and circuit is set up through the column or tank and
each coil.
3. In a steam generator a water tank, a vaporizing coil located in the fire
passage and connections from opposite ends of said coils, respectively, to opposite
ends or portions of said tank or body of water.
4. A steam generator provided with a vaporizing coil the convolutions of which
extend from the outside inwardly and upwardly towards the centre forming the coil
in the shape of a truncated cone, the inner and outer ends of the coil being,
respectively, connected with opposite portions of a water column or body.
5. In a steam generator, the combination of the boiler and fire pot, the series of
independent vaporizing coils in the fire pot located one above the other, and each
havings its convolutions inwardly and outwardly and independent connections from
opposite ends of the coils, respectively to opposite ends of the boiler, as and for the
purposes substantially as set forth.
6. In a steam generator, the combination of the series of vaporizing tubes each
having its opposite ends independently connected to opposite portions or ends
of a water column so that a complete circuit is formed through each coil and the
boiler.
7. In a steam generator, the combination of the boiler, the fire pot within the
same and having a vertical outlet through the same, the series of vaporizing coils
in the fire pot, the connections from the lower portion of the boiler independently
to the outer end of each coil, and the independent connections from the inner ends
of the coils extending up the centres of the coils to the upper portion of the boiler,
substantially as described.