Improvements in Water-tube Steam Generators.
Year: 1890

page_text: Date of Application, 21st Feb., 1890
Complete Specification Left, 21st Nov., 1890-Accepted, 27th Dec., 1890
PROVISIONAL SPECIFICATION.
Improvements in Water-tube Steam Generators.
We, CHARLES FREDERICK DIXON, of the Cleveland Bridge and Engineering
Company, of Darlington, in the County of Durham, Engineer, and WILLIAM NATHAN
DACK, of 10 Byron Street, Patricroft, in the County of Lancaster, Engineer, do
hereby declare the nature of this invention to be as follows:-
:-
Our invention relates to improvements in water tube steam generators and the chief
object of our improvements is to economise in working by increasing the volume of
steam generated relatively to the quantity of fuel consumed.
In carrying our improvements into effect we employ a small boiler of the Cornish type
that is to say a water vessel with a flue through it but without any firegrate. This
boiler is suspended from or supported below the steam and water drum or separating
vessel to which it is connected by a series of nipples or equivalents. If nipples be
used for this purpose holes are cut in the steam and water drum and corresponding
holes in the boiler and the shells of both vessels may be strengthened at these points
by the application of plates with bosses formed or fixed upon them corresponding in
position to said holes the plates being rivetted to the shells. We divide the inclined
water tubes into two or more passages say for example three passages by means of a
partition or partitions extending across the rows of inclined tubes. The gases rising
from the firegrate pass upward through the first passage at the head of the rows of
inclined water tubes, through the flue of the small boiler, back between the steam and
water drum and downward around the outside of the small boiler through the second
passage in the inclined water tubes and upward through the third passage (if there be
three) and finally passing between the pipes connecting the drum and boiler to the
rear headers or chamber and escaping by the flue.
In conjunction with the above described arrangement we may employ any means
for connecting the front and back headers or chambers to the steam and water drum ;
but we prefer to employ the following mode which we will describe as applied to the
front headers or obamber.
We prefer to enlarge the front end of the steam and water drum to form a chamber
which is made flat on the underside and is preferably constructed similarly to the
outside shell of a locomotive firebox. In this flat bottom holes are drilled for the reception
of the nipples or equivalents by which the front headers (or chamber) are secured to
the steam and water drum. Each header is T shaped or shaped like an inverted so
as to form a flat and prolonged surface corresponding to the flat portion of the drum
and capable of receiving sufficient nipples to ensure free circulation at this point.
This form of chamber and headers can be applied to the rear end of the boiler.
We prefer to connect the steam and water drum to the back headers or chamber
by means of a drum or water box placed transversely below the steam and water
drum. This drum or water box is connected above by a pipe or pipes to the small
boiler or to the steam and water drum and below to the back headers by as many
pipes as there are headers.
In this arrangement we propose to connect a filter to the lower ends of the inclined
water tubes and introduce all the feed water through this filter.
Dated this 20th day of February 1890.

page_text: COMPLETE SPECIFICATION.
Improvements in Water-tube Steam Generators.
We, CHARLES FREDERICK DIXON, of the Cleveland Bridge and Engineering
Company, of Darlington, in the County of Durham, Engineer, and WILLIAM NATHAN
DACK, of 10 Byron Street, Patricroft, in the County of Lancaster, 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:
Our invention relates to improvements in water tube steam generators and the chief
object of our improvements is to economise in working by increasing the volume of
steam generated relatively to the quantity of fuel consumed.
And in order that our invention may be fully understood and readily carried into
effect we will describe the accompanying two sheets of drawings reference being had
to the figures and letters marked thereon.
Figure 1 is a longitudinal sectional elevation of a water tube steam generator to
which our improvements have been applied. Fig. 2" is a half sectional elevation taken
on the line. A B, Fig. 1 and Fig. 2 is a similar view on the line C D, and Figs. 3
and 4 are detail views of the parts.
Figures 5 and 6 are longitudinal and end elevations respectively of an alternative
arrangement according to our invention and Fig. 7 is a modification of part of the
arrangement illustrated by Figs. 5 and 6.
Similar letters refer to similar parts throughout the several views.
Referring first to the improved boiler illustrated by the drawings on Sheet 1 in
which a designates the inclined water tubes, the front and c the rear headers, d the
steam and water drum or separating vessel, and e the firegrate.
According to our improvements we employ a small boiler f of the Cornish type
that is to say a water vessel with a flue f¹ through it but without any firegrate. This
boiler is suspended from or supported below the steam and water drum d to which
it is connected by a series of nipples g or equivalents. If nipples be used, as shown,
for this purpose holes are cut in the steam and water drum d and corresponding holes
in the boiler fand the shells of both vessels may be strengthened at these points as
shown best in the enlarged detail view Fig. 3 by the application of plates with
bosses formed or fixed upon them corresponding in position to said holes, the plates /
being rivetted to the shells. We divide the inclined water tubes a into two or more
passages say for example three. passages by means of in this case two brickwork
partitions i extending across the rows of inclined tubes. The gases rising from the
firegrate e pass upward as indicated by the arrows Fig. 1 through the first passage
at the head of the rows of inclined water tubes a, through the flue f¹ of the small
boiler f, back.outside the steam and water drum d and downward around the outside of
the small boiler through the second passage in the inclined water tubes a and upward
through the third passage (if there be three as in this case) and finally passing between
the pipes by which the drum d and boiler fare connected to the rear headers cor
chamber and escaping by the flue k.
In conjunction with the above described arrangement we may employ any means
for connecting the front and back headers or chambers to the steam and water drum d;
but we prefer to employ the following mode which we have shown and will describe as
applied to the, front headers b or it might be to a chamber or slab end.
T
We prefer to enlarge the front end of the steam and water drum d¹ to form a
chamber d which is made flat or curved on the underside and is preferably constructed
similarly to the outside shell of a locomotive firebox. In this flat bottom holes are
drilled for the reception of the nipples or equivalents by which the front headers b
(or chamber) are secured to the steam and water drum d. Each header or chamber
is shaped or shaped like an inverted L so as to form a flat or curved and prolonged
surface corresponding to the flat portion on the underside of the drum and capable of
. receiving sufficient nipples to ensure free circulation at this point.

page_text: We prefer to connect the steam and water drum d to the back headers c (or
chamber) by means of a drum or water box m placed transversely below the steam
and water drum d. This drum or water box is connected above by a pipe n to the
steam and water drum d and by a pipe o to the small boiler fand below to the back
headers by as many pipes; as there are headers or more if required.
In this arrangement we propose to connect a filter p to the lower ends of the headers c
and inclined water tubes a by pipes or nipples and introduce all the feed water
supplied by the pipes through this filter p which is provided with a blow-off cock t.
This form of chamber such as d' and headers & can be applied to the headers cat
the rear end of the boiler as shown in Figs. 5 and 6 and also in the modification
Fig. 7.
In Figs. 5 and 6 the rear headers c (or chamber) are preferably of inverted Lor it
might be T shaped and a chamber d similar to d¹ is formed at the rear end of the
steam and water drum d and the headers c, which are supported in any convenient
manner, are prolonged and connected to the flat portion of the chamber d¹ by nipples-/
or any suitable equivalent connection.
In the modification Fig. 7 the rear headers c (or chamber) instead of being prolonged
the whole distance as shown in Figs. 5 and 6 are each made in two sections connected
together by pipes j.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
In a water tube steam generator.
1. The combination with the steam and water drum or separating vessel, of a
small boiler such as f connected to the underside of said drum by nipples or equivalents
and so arranged that the gases arising from the firegrate pass through the flue or flues
of said boiler and subsequently pass downward through the rows of inclined water
tubes before escaping by the ordinary flue.
2. The combination with the drum d, the pipe n and the water box m, of the boiler f
connected by nipples or equivalents to the underside of the drum d and by a pipe or
pipes o to the water box m substantially as herein shown and described.
3. The combination with a chamber or chambers such as d¹ and d being preferably
flat on the underside, of T or inverted shaped headers or chambers substantially as
and for the purposes herein described with reference to the drawings annexed.
4. The several constructions combinations and general arrangements of parts
embodying our improvements substantially as and for the purposes herein described and
as shown.
Dated this 20th day of November 1890.
H. B. BARLOW,
17, St. Ann's Square, Manchester, Agent for Applicants.