Improvements in or relating to Steam Generators or Boilers.
Year: 1893

page_text: Date of Application, 19th June, 1893-Accepted, 23rd Sep., 1893
COMPLETE SPECIFICATION.
Improvements in or relating to Steam Generators or Boilers.
A communication from JossE EGIDE SPANOGHE, of Antwerp, in the Kingdom of
Belgium, Professor (71 Lange Ruysbroeckstrasse).
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I. Mech. E., and Chartered Patent Agent 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:―
The object of this invention is to manufacture a steam-generator which shall
instantly furnish steam and shall be inexplosive and economical.
The novelties essentially consist in constructing the steel-tubes, the walls of which
are preferably very thick, in comparison with the diameter, in the form of a
continuous range of tubes, which may be arranged in different ways for instance as
a spiral or serpentine bundle, so that the whole range of tubes can be rotated about
a shaft within the boiler and directly above the furnace.
Both ends of the range of tubes are connected with the hollow shaft so that the
hot water from the water-chamber or boiler enters the tubes at one end and the high-
pressure steam leaves them at the other end.
The revolving shaft is provided at both ends with stuffing-boxes so that the
entrance of the hot water from the boiler into the hollow shaft and the escape of
the high pressure steam from the tubes can take place without loss or difficulty.
In the accompanying drawings
Figure 1 is a vertical section of a water chamber or boiler with revolving
tubes.
Figure 2 is a vertical section through the revolving shaft.
The tubes are preferably arranged in serpentine form around the shaft so as to
be parallel with it.
Figures 3 and 4 are also vertical sections, but the tubes are arranged in three
helical coils around the shaft.
Figures 5, 6 and 7 show details of the mode of joining the tubes.
Figures 8 and 9 show the arrangement of the stuffing-boxes.
In Figures 1 and 2 A is the hollow shaft carried in bearings K. It is composed
of two parts and the inner bore is cut off at D.
G is the grate; the fire burning thereon heats the water enclosed in the water-
chamber F and heats the tubes E by its flames. The heating-gases escape above.
through a chimney L. From the water-chamber F a tube-conduit passes to the
left hand stuffing-box A' of the revolving shaft A; and the hot water so conveyed
enters the bore of A and on reaching the middle part D passes through a tube-
socket (see Figure 1) into the first tube; it thence circulates all through the
tubes and is transformed into high-pressure steam. The steam leaves the tubes
through the passage P and enters the right hand bore of the shaft A which is
separated at D from the left hand bore and passes out of the boiler through the
right hand stuffing-box A'.
During the circulation of the water through the tubes the shaft may be revolved
by a pulley M or other suitable device so that the superheating process takes place
uniformly.
The boiler is charged with fuel through the fire-door H.
The same process for generating steam takes place in the modification shown in
Figures 3 and 4. The hot water leaving the water chamber F enters through A¹
and A on the left hand side into the socket N and into the inner coil of tubes E¹
circulating through these tubes till it reaches the last tube on the right hand side.
Here it enters into the second coil of tubes circulating through these also till it
TU 017

page_text: reaches the last tube on the left hand side. It now enters the third or outer coil of
tubes from whence it passes through a socket O into the right-hand portion of the
revolving shaft A leaving the boiler through A'. The water tubes are in this case
The
indicated by the letter E all other letters remaining the same as before.
tubes may be connected together preferably by one of the three methods shewn in
the drawings and according to Figure 5 the tubes a and b may be made with
conical socket and spigot ends held together by screw bolts passing through the
flanges B which flanges have been screwed on the exterior of the tubes.
In the arrangement shewn in Figure 6 the tubes a¹are screwed together a
washer A of copper being provided to keep them tight.
Figure 7 shews an arrangement similar to Figure 6 a sleeve B" covering the
place where the tubes are kept tight, against attack from the fire.
Figures 8 and 9 show the arrangement of the stuffing boxes of the revolving-
shaft A which is the same on both sides.
A is the revolving shaft, A' the immovably fixed inlet-tube, B B¹ are the parts
of the stuffing-box, R R are two screw-bolts which are arranged for the purpose of
preventing a longitudinal displacement of A'.
Having now particularly described and ascertained the nature of this said inven-
tion as communicated to me by my foreign correspondent and in what manner the
same is to be performed, I declare that what I claim is :-
1. A steam generator or boiler consisting in the arrangement of tubes the walls of
which are very thick in comparison with their diameter formed in serpentine or
spiral coils around a hollow shaft such as A. revolving in the interior of the boiler
so that the hot water coming from the water chamber may enter the hollow shaft
at one side and circulate through the tubes thereby becoming converted into
superheated steam which escapes at the other side of the hollow shaft while the
whole range of tubes is continuously revolving with the shaft for the purpose of
obtaining a uniform delivery of heat for generating steam substantially as described
and illustrated in the accompanying drawings.
2. In combination with the arrangement characterized in Claim 1 the division of
the bore of the shaft A into two separate compartments one of which serves for
receiving the hot water from the water-chamber and the other for discharging the
steam as it leaves the tubes substantially as described and illustrated in the
accompanying drawings.
3. In combination with the arrangement of the hollow shaft characterized in
Claims and 2 the bolts R for preventing a longitudinal displacement of the
non-revolving inlet-tube A' with regard to the shaft substantially as described and
illustrated in the accompanying drawings.
Dated this 10th dox of June 1893
W. P. THOMPSON & BOULT,
Agents for the Applicant.