Year: 1899

page_text: 1, WILHELM SCHMIDT, of Wilhelmshöhe, near Cassel, Germany, Civil Engineer,
do hereby declare the nature of this invention to be as follows:-
The construction hereinafter to be described represents a superheater arrange-
ment specially intended for locomotive boilers.
In such boilers with their confined build and forced firing it is necessary
that
.
:
1. The superheater should have a large heating : surface occupying, the least
possible space.
:
2. A large number of parallel tubes should be available having the required
total sectional area for the great amount of steam to pass through.
3: The middle part of the smoke box should be free so as to afford access to
all the boiler tubes and for the exhaust.
4. The centre of gravity should not be moved too high above the centre of
the boiler, and the superheater should in view of oscillations be firmly united
to the boiler in all its parts.
The hot gases from the fire box enter a. ring chamber from a large tube
Fig. 1 arranged as described in the Patent Specification 22331 of 1898 said
ring chamber being formed of the walls of the smoke box and the inner walls b
which latter terminates below the chimney.
C
The hot gases divide in two parts at the bottom of the ring chamber as indicated
by the arrows in Fig. 2 and pass over the superheater pipes in the ring
chamber up to their collecting boxes'd and e; the pipes are bent as shewn
and thus themselves form guiding channels; this is of great importance as a
guiding channel without special means for cooling easily becomes distorted,
without taking in account the unavoidable loss of heat which by my construction
is avoided, because the walls of the guiding chamber form effective heating
surface in the superheater. "In order to protect the walls 6 as much as possible. I
provide as shewn in Fig. 3 angular shields 6 on the inner heating pipes, thus
avoiding direct contact of the gases with the walls b. f. f are flaps at the exit
openings of the ring chamber for regulating the flow of the hot gases.
This arrangement offers the advantage that the middle part of the smoke box-
is not stopped up with any superheater parts or casings. The boiler tubes can
be freely swept, and there is room for steam pipes or exhaust pipes in the usual
way within the smoke box.
g is a pipe among the. superheater pipes or in the middle of the annular
chamber for blowing off the ashes from the- tube a..
Figs. 4 and 5 shew.an arrangement for compound cylinders in order that
the superheating may be distributed to both cylinders, so that the receiver steam
is also superheated. The high pressure steam enters the box d, passes, over
the one half of the superheater pipes, collects in e, flows from thence to the hiri
pressure cylinder and returns from it to the box e¹ passes then through the
second part of the superheater in order to enter the box and then go to the

page_text: low pressure cylinder. In Fig. 4 the collecting boxes are shewn out of place
for clearness' sake, while Fig. 5 shews their true position behind each other.
The boxes and e are also so divided in the middle as shown at d Fig. 1
that the steam passes twice through the superheating pipe c, only there are not
as for the compound engine arrangement high pressure and low pressure steam
in the respective half chambers but the fresh steam entering by the pipe takes
the course indicated by the arrows, that is to say it is compelled to pass twice
through the ring chamber till it reaches the pipe y. On the other hand in Fig. 2
the steam from goes at the same time through all the pipes to e.
Dated this Twentieth day of June 1899.
JENSEN & SON,
77, Chancery Lane, London, W.O., Patent Agents.
I, WILHELM SCHMIDT, of Wilhelmshöhe, near Cassel, Germany, Civil 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:-
The construction hereinafter to be described represents a superheater arrange-
ment specially intended for locomotive boilers.
In such boilers with their confined build and forced firing it is necessary
that
1. The superheater should have a large heating surface occupying the least
possible space.
2. A large number of parallel tubes should be available having the required
total sectional area for the great amount of steam to pass through.
3. The middle part of the smoke box should be free so as to afford access to
all the boiler tubes and for the exhaust.
4. The centre of gravity should not be moved too high above the centre of
the boiler, and the superheater should in view of oscillations be firmly united
to the boiler in all its parts.
In order to make my invention more clear, I refer to the drawing filed with
the Provisional Specification.
The hot gases from the fire-box enter a ring chamber from a large tube a
(Figure 1) arranged as described in the Patent Specification No. 22331 of 1898, said
ring chamber being formed of the walls of the smoke box and the inner walls b,
which latter terminates below the chimney.
The hot gases divide in two parts at the bottom of the ring chamber as indicated
by the arrows in Figure 2 and pass over the superheater pipes c in the ring
chamber up to their collecting boxes d and e; the pipes care bent as shown
and thus themselves form guiding channels; this is of great importance as a
guiding channel without special means for cooling easily becomes distorted,
without taking in account the unavoidable loss of heat, which by my construction
is avoided, because the walls of the guiding chamber form effective heating
surfaces in the superheater. In order to protect the walls b as much as possible, I
provide, as shown in Figure 3, angular shields b¹ on the inner heating pipes, thus
avoiding direct contact of the gases with the walls b. ff are flaps at the exit
onenings of the ring chamber for regulating the flow of the hot gases.
This arrangement offers the advantage that the middle part of the smoke box
is not stopped up with any superheater parts or casings. The boiler tubes can

page_text: be freely swept, and there is room for steam pipes or exhaust pipes in the usual
way within the smoke box.
g is a pipe among the superheater pipes or in the middle of the annular
chamber for blowing off the ashes from the tube a.
Figures 4 & 5 show an arrangement for compound cylinders in order that
the superheating may be distributed to both cylinders, so that the receiver steam
is also superheated. The high pressure steam enters the box d, passes over
the one half of the superheater pipes, collects in e, flows from thence to the high
pressure cylinder and returns from it to the box e¹, passes then through the
second part of the superheater in order to enter the box and then go to the
low pressure cylinder. In Figure 4 the collecting boxes are shown out of place
for clearness' sake, while Figure 5 shows their true position behind each other.
In Figure 1 the boxes d and e are also so divided in the middle that the steam
passes twice through the superheating pipe c, only there are not as for the com-
pound engine arrangement high pressure and low pressure steam in the respective
half chambers, but the fresh steam entering by the piper takes the course
indicated by the arrows, that is to say it is compelled to pass twice through the
ring chamber till it reaches the pipe y. On the other hand in. Figure 2 the
steam from d goes at the same time through all the pipes to e.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. In a tubular boiler with superheater, the combination of superheating
tubes with a ring channel. which is arranged on the walls of the smoke-box,
so that the middle part of the latter is not stopped up with any superheater
parts or casings, substantially and for the purpose as described.
2. In a tubular boiler with superheater, the combination of superheating
tubes, at which one or more of the tubes are bent forming a channel for the
hot gases, substantially and for the purpose as described.
Dated this 8th day of March 1900
JENSEN & SON.
77, Chancery Lane, London, W.O., Patent Agents.