Improvements in Steam-generators.
Year: 1889

page_text: Date of Application, 21st Aug., 1889-Accepted, 28th Sept., 1889
COMPLETE SPECIFICATION.
Improvements in Steam-generators.
I, GUSTAV DÜRR, of Ratingen, near Düsseldorf, in the Kingdom of Prussia and
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 :-
The present invention relates to improvements in steam-generators of the return
water-tube type, in which circulating tubes are arranged within the heating tubes; the
passages to and from the respective sets of tubes being kept separate by means of
a wall or partition placed within the water-chamber with which the tubes communi-
cate. The main objects of this invention are to facilitate the removal of each
individual heating tube; to simplify the cleaning of the water-chamber and tubes;
and to enable the water to pass freely from the front part of the said chamber to the
circulating tubes.
In the accompanying drawings, Fig. 1 is a longitudinal section, Fig. 2 a plan
and Fig. 3 partly a cross section and partly a front elevation of a steam-generator
embodying the present improvements; Figs. 4 to 12 being views shewing details of
construction.
The wall or partition w is formed of numerous plates y, some of which are furnished
with funnels ; the latter communicating with and supporting the circulating tubes s.
The wall w serves to separate the steam generated in the heating tubes » from the
water descending by way of the outer compartment of the chamber. The construction
of the plates y and of the funnels x is shewn in detail in Figs. 5 and 6. The funnels x,
which are in connection with the circulating tubes s, fit tightly in the orifices formed
in the plates y; the shape of the plates varying, as indicated in Fig. 6, according to
their relative positions in the chamber. The tuber being in an inclined position, the
plates y lean against the jam-nuts h on the stay-bolts; suitable washers / being inter-
posed. By means of the nuts i, the said plates can be tightened against the jam-nuts h.
Between each nut i and the corresponding plate y, a bent washer z is inserted (Figs. 5
and 6). The lower ends of the plates y which fit on the stay-bolts are provided with
semicircular slots (see Fig. 5); whilst the upper ends are formed to correspond with
the shape of the nut i, which in the present instance is hexagonal. This construction
enables each plate to be turned down after withdrawing the circulating tube
loosening the nuts i and removing the washers z. The plate, when turned down,
The width of
may be removed through the front plate p by way of the aperture o.
the slots or openings in the plates y (Fig. 6) is equal to the diameter of the heating
tube r.
The maximum diameter of each plate y must, however, be a trifle larger than
that of the widest part of the flange at the upper end of the tube r; the said
maximum diameter of the plate y being a little smaller than that of the narrowest
part of the conical aperture o in the front plate p of the chamber.
51
The particular shapes of the different pieces shewn in the figures referred to, and
the relative dimensions indicated, are intended to enable the following operations to
be readily carried out :-(1) The cleaning of the heating tuber by means of a brush
passed through the orifice in the corresponding plate y after the removal of the
circulating tubes and funnel x. (2) The turning down of the plate y and its removal
through the aperture o after the cover q has been taken off, two nuts i loosened and
the corresponding circulating tubes withdrawn. (3) The withdrawal of the heating
tuber through the opening o. (4) The proper fitting together of the plates y y so
that they may form an uninterrupted partition w for effectually separating the water
compartment from the steam compartment of the chamber.
The water passes freely from the water compartment through the funnels & into the

page_text: circulating pipes s. A transverse partition t (Fig. 1) in the drum K is united to the
partition w by an intermediate partition d extending through the connecting tube.
The drum is divided longitudinally by a wall e, which is furnished with a four-
sided slot at the bottom of its front part (Fig. 1). An inclined wall or plate f
(Figs. 2 and 3) joins the upper edge of the slot; the communication with the upper
portion of the steam division being thus cut off. The right-hand portion of
the steam division is fitted with sloping walls g which, in conjunction with the
transverse partition t and the inclined plate f, form a funnel-shaped channel for con-
ducting the steam from the heating tubes into the right-hand compartment of the
drum K (Fig. 3), whence the steam, passing round the back edge of the wall e,
arrives in the left-hand half of the drum K, which half is in communication with the
dome. The transverse partition t, Fig. 3, is provided, at the upper part of its left
side, with a sector-shaped slot a a a for enabling the steam to pass into the dome. As
the horizontal edge of the slot a a a (Fig. 3) is situated below the lowest water level,
the water fed into the drum, after flowing from the right into the left compartment
thereof, passes through the slot, whence it descends into the circulating tubes s.
The tubes then serve to heat the water and convert a part thereof into steam,
whereupon the steam and the water pass from the steam division into the drum,
as described above; the steam finally entering the dome.
A mud-receptacle or -intercepter is formed by the partition t in conjunction with
the inclined plate f; such receptacle being designed to receive the mud or other
deposit precipitated from the water. The mud-receptacle thus provided prevents
impurities from being carried into the chamber and tubes.
To facilitate the cleaning of the heating tubes, each of the latter is furnished at
its rear end with a closing device as shown, on an enlarged scale, in Figs. 7, 8
and 9. The device comprises a taper ring or flange A on the end of the pipe, behind
which flange clips B B are arranged. A yoke D containing a set-screw C is hooked
on the clips B B; the hook-shaped ends E of the yoke being bent in opposite
directions that is, one to the left and the other to the right. The hollow cap F,
which is tapered internally to correspond with the taper flange A, is pressed home by
the set-screw ; the end of the tube being thereby effectively closed.
In cases where it is not desirable for the partition in the chamber to consist of many
different pieces, the construction of such partition may be modified in the manner
illustrated in Figs. 10, 11 and 12. In Fig. 10, plates K K are screwed on the stay-
bolts J. The distance between each section of the wall or partition L and the
corresponding stay-bolt is twice as long at M as it is at N, so that each section may
be turned into the position indicated in dotted lines at 00. In Fig. 11, the sections
are hinged at P; ledges Q being provided to secure a better joint. In the arrange-
ment shown in Fig. 12, the sections are fastened directly to ledges R by means of
bolts, hooks or screws so that they may be easily detached when required.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I claim :-
1. In a steam-generator of the type herein referred to, the employment of a
partition w formed of plates y, substantially as described with reference to Figs. 1 to 6
of the accompanying drawings; the same serving to support the circulating tubes s
and to divide the water-chamber into two compartments.
2. In a steam-generator of the type herein referred to, the combination with a
partition w formed of plates y, a partition t extending across the drum K, and an
intermediate partition d, of the inclined plate f, sloping walls 9, and a longitudinal
partition e; the parts being so arranged as to establish communication between the
rear or steam compartment of the chamber and the upper part of the drum K, and
between the front or water compartment of the chamber and the lower part of the
drum K, substantially as and for the purposes set forth.
3. In a steam-generator of the kind herein referred to, the improved means,
substantially as described, for closing the rear end of the heating tubes; the same

page_text: comprising a cap fitted to and tapered to correspond with a conical ring or flange
at the end of the tube, two clips B B, and a yoke D carrying a set-screw C whereby
the cap is tightened and held in place.
4. In a steam-generator of the kind herein referred to, the modified forms of
partition for dividing the water chamber, substantially as described with reference
to Figs. 10, 11 and 12 of the accompanying drawings.
Dated the 21st day of Anonst. 1889.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Agent for the Applicant.