Improvements in and relating to Steam Generators.
Year: 1895

page_text: Date of Application, 24th Jan., 1895
Complete Specification Left, 23rd Oct., 1895-Accepted, 23rd Nov., 1895
PROVISIONAL SPECIFICATION.
Improvements in and relating to Steam Generators.
I, GUSTAV DÜRR, of No. 84 Grafenberger Chaussee, Düsseldorf, in the
Kingdom of Prussia, and Empire of Germany, Engineer, do hereby declare the
nature of this invention to be as follows:-
My invention relates to steam generators..
According to this invention I provide in tubular steam generators a water
chamber presenting the peculiar feature that the parts which close the openings
formed in the outer wall of the chamber and corresponding to the several tubes
connect at the same time the two walls of such chamber with each other, inasmuch
as they engage by means of screw threads with the tubes fixed in the interior
wall. This connection is preferably such that, by screwing the parts which
serve for the aforesaid double purpose and the water tubes together, the latter
will be fixed in the interior wall of the chamber, being tightened therein from the
outside.
Each opening formed in the outer wall of the water chamber and corresponding
to a water tube is closed by a disc whose edge forms a tight joint from the outside,
being for instance made in the form of a cone. The disc constitutes the bottom
of a cup screwed with its free edge upon or into the end of the water tube
which is situated in the inner wall of the water chamber. The water tube may
be inserted from the outside into the wall of the chamber and tightened, which,
as already stated, offers the advantage that the insertion and tightening are
simply effected by screwing the cup and tube together. The edge of the tube
which serves for tightening the joint from the outside may for example also
constitute a cone. As the cup is firmly connected with the tube the tightening
edges of the two parts form fixed abutments for the walls of the water chamber
which are forced to the outside by the steam pressure, so that any further
connection of the chamber walls with each other will be superfluous. For
facilitating the mounting, the arrangement of several light bolts is desirable.
Openings in the wall of the cup establish the communication between the interior
of the water tube and the interior of the water chamber.
The improved arrangement of the water chamber may also be combined with my
system of generator having water tubes, which is characterized by the feature that
the water tubes closed at one end and therefore connected only with one water
chamber are provided with inner circulating tubes which extend from a partition in
the water chamber to within a short distance from the closed end of the water
tubes. Each circulating tube is fixed with its enlarged end in the corresponding
cup, so that on the removal of this cup the water tube is completely accessible.
The opening in the partition through which the cup is passed may be closed by the
wall of the cup or by a rib arranged upon it.
By the use of the water chamber characterized by the described cup I solve in
a simple manner the problem of conducting a fire tube or flue through the water
tube. One end of the fire tube is inserted into the bottom of the cup. When
the opposite end of the fire tube is then loosened the fire tube is removed from the
water tube by screwing out the cup, thus laying the water tube quite bare. If to
this combination of tubes a circulating tube is added, which is arranged outside the

page_text: fire tube and inside the water tube concentrically with both tubes, and inserted into
the cup as described, the two inner tubes may be removed at the same time from
the water tube by screwing out the cup.
Dated this 24th day of January 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
}
I, GUSTAV DÜRR, of No. 84 Grafenberger Chaussee, Düsseldorf, in the
Kingdom of Prussia, Empire of Germany, 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 :-
My invention relates to steam generators.
According to this invention I provide in tubular steam generators a water
chamber presenting the peculiar feature that the parts which close the openings
formed in the outer wall of the chamber and corresponding to the several tubes
connect at the same time the two walls of such chamber with each, other, inasmuch
as they engage by means of screw threads with the tubes fixed in the interior wall.
This connection is preferably such that, by screwing the parts which serve for the
aforesaid double purpose and the water tubes together, the latter will be fixed in
the interior wall of the chamber, being tightened therein from the outside.
Each opening formed in the outer wall of the water chamber and corresponding
to a water tube is closed by a disc whose edge forms a tight joint from the outside,.
being for instance made in the form of a cone. The disc constitutes the bottom of
a cup screwed with its free edge upon or into the end of the water tube which is
situated in the inner wall of the water chamber. The water tube may be inserted
from the outside into the wall of the chamber and tightened, which, as already
stated, offers the advantage that the insertion and tightening are simply effected
by screwing the cup and tube together. The edge of the tube which serves for
tightening the joint from the outside may for example also constitute a cone.
As the cup is firmly connected with the tube the tightening edges of the two
parts form fixed abutments for the walls of the water chamber which are forced
to the outside by the steam pressure, so that any further connection of the
chamber walls with each other will be superfluous. For facilitating the mounting,
the arrangement of several light bolts is desirable. Openings in the wall of the
cup establish the communication between the interior of the water tube and the
interior of the water chamber.
The improved arrangement of the water chamber may also be combined with
my system of generator having water tubes, which is characterized by the feature
that the water tubes closed at one end and therefore connected only with one
water chamber are provided with inner circulating tubes which extend from a
partition in the water chamber to within a short distance from the closed end of
the water tubes. Each circulating tube is fixed with its enlarged end in the
completely
corresponding cup, so that on the removal of this cup the water tube
accessible. The opening in the partition through which the cup is passed may be
closed by the wall of the cup or by a rib arranged upon it.
By the use of the water chamber characterized by the described cup I solve
in a simple manner the problem of conducting a fire tube or flue through the
water tube. One end of the fire tube is inserted into the bottom of the
cup. When the opposite end of the fire tube is then loosened the fire tube
is removed from the water tube by screwing out the cup, thus laying the water

page_text: tube quite bare. If to this combination of tubes a circulating tube is added, which
is arranged outside the fire tube and inside the water tube concentrically with both
tubes, and inserted into the cup as described, the two inner tubes may be removed
at the same time from the water tube by screwing out the cup.
And in order that this invention may be fully understood I shall now proceed
more particularly to describe the same with reference to the accompanying drawing,
in which
Figure 1 represents in vertical section the connection of the water chamber walls
with each other.
J. J
Figure 2 is a similar view showing the same arrangement but with a fire tube
conducted through the water tube.
Figure 3 is a vertical section of, a tubular steam generator with only one water
chamber and provided with my improved circulating tubes and with fire tubes within
the circulating and water tubes.
Referring now to Figure 1, b is the water tube, which is tightened in the wall d
of the water chamber by means of a cone 6°. The cup a with its threaded open
end a¹ is screwed into the cone 6° of the water tube b and with its other end, which
is closed by the bottom or disc a², it is securely fixed in the wall c of the water
chamber by means of the conical edge a° provided around the bottom a² of the
cup. For the conical tightening surfaces a° and 6° plane annular surfaces may be
substituted, in connection with which suitable packing rings should be used. The
bottom a of the cup a at its exterior surface presents projections a*, so arranged as
to be engaged by a proper key-lever, when the cup is to be inserted or taken out.
The wall of the cup has three openings a³, one at each side allowing the passage
of the water from the water chamber into the cup, whilst a third one at top allows
the escape of steam or of steam mingled with water from the cup into the water
chamber. An annular rib a serves to strengthen the wall of the cup, which is.
weakened by the openings a³.
Moreover Figure 1 shows by dotted lines, how the water chamber arrangement,
as herein described, may be applied to a tubular boiler with a single water chamber
and circulating tubes disposed according to my improved system. The partition e°,.
which divides the water chamber into a front space, the true water chamber, and a
back space, the steam chamber, is cut out so as to fit closely around the rib a³ of
the cup wall. The circulating tube is joined with its enlarged front mouth to the
wall of the cup in the plane of the rib as and is secured by suitable means within
the cup, so that it is inserted into or taken out of the water tube, whenever the cup.
is screwed into or out of the water tube.
Figure 2 illustrates the case in which a fire tube f is conducted lengthwise
through the water tube. One end of the fire tube is firmly secured; for example
it may be welded in a circular opening in the bottom a² of the cup.
When the
joint of the fire tube at its opposite end with the corresponding end of the
water tube or with the second water chamber has been loosened, the fire] tube,
together with the cup, may be removed from the water tube after the screw-threaded
connection between the cup and the water tube has been unscrewed.
g
The tubular steam generator with a single water chamber and a receiver 9 above
the same as represented in Figure 3 shows the arrangements of Figures 1 and 2
combined, each water tube surrounding a circulating tube e and also a fire tube f.
The fire tube is the innermost and its rear end is tightly fixed by rolling in a ring 6¹,
which is securely fastened in the rear end of the water tube preferably by
welding. The connection of the fire tube f with the ring b¹ being loosened, the
cup, the circulating tube and the fire tube may be removed together from out of
the water tube.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1
A water chamber having cuns the onen ends of which are screwed into the

page_text: ends of the water tubes which latter are firmly secured in the rear wall of the
water chamber, the said cups closing with their closed ends the openings in the front
wall of the water chamber and having openings in the cylindrical walls thereof,
substantially as shown and described.
2. In a water chamber having cups as described in Claim 1 a partition e° and
circulating tubes e secured within the cups substantially as shown and described.
3. In a water chamber having cups as described in Claim 1, the provision of fire
tubes securely fastened in the bottom of the cups and conducted throughout the
water_tubes, substantially as shown and described.
4. In a water chamber having cups as described in Claim 1, the provision of a
partition e, circulating tubes e secured within the cups, and fire tubes f securely
fastened in the bottom of the cups and conducted throughout the circulating and
water tubes, substantially as shown and described.
5. The general arrangement of means for connecting the walls of a water
chamber with each other and with water, circulating and fire-tubes, substantially as
shown and described.
مد
י.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.