Year: 1897

page_text: I, ARTHUR GEORGE MUMFORD, of The Culver Street Ironworks, Colchester, in
the County of Essex, Engineer, do hereby declare the nature of this invention to
be as follows:
-
This invention relates to steam generators of that class known as water tube
boilers and is particularly applicable to those described in the Specifications of
my prior Letters Patents No. 8729 of 1893 and No. 8043 of 1895 and it comprises
means whereby the feed water is heated in a simple and economic manner.
In carrying out my invention with respect to the boiler described in the Speci-
fication of my Patent No. 8729 of 1893 wherein a certain number of the water
tubes are grouped together in such a manner as to form separate self contained
elements, I form or fix a diaphragm or plate in the interior of the water chamber
in such a manner as to shut off one or more of the upper tubes from the others
contained in that element, this diaphragm or plate is furnished with any suitable
form of valve that will open or allow water to pass from the bottom of the
chamber upwards when the pressure is equal on both sides of the diaphragm or
plate but closes when the pressure is greater above the diaphragm or plate. The
feed water enters above the diaphragm or plate and as the pressure will therefore
be greater above the valve than below it, the feed water is forced to pass through
the upper tube or tubes shut off by the diaphragm or plate whereby it is heated
before it begins to circulate through the rest of the tubes. When the water is
not being fed into the boiler the valve will open or allow the water to circulate
through the upper tube or tubes as usual.
Instead of forming the valve in the diaphragm or plate within the water
chamber the valve may be contained in a separate pipe, box or casting fixed
outside the chamber but so communicating therewith that the diaphragm and
valve will act in the same manner as though the valve were inside.
In applying this invention to the boiler described in the Specification of my
prior Letters Patent No. 8043 of 1895 or to water tube boilers in general of this
type i form or fix within the water chamber a plate or casing in such a manner
as to shut off one or more of the upper tubes the box or compartment thus formed
is furnished with a valve adapted to act in precisely the same manner and for the
same purpose as before described or the valve may be contained in a separate
pipe, box or casting outside the chamber as previously described.
1
1007
ROBERT E. PHILLIPS, Assoc. M.I.C.E., M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.

page_text: Improvements in and relating to Steam Generators.
I, ARTHUR GEORGE MUMFORD, of The Culver Street Iron Works, Colchester, in
the County of Essex, 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:-
This invention relates to steam generators of the water tube type and is par-
ticularly applicable to those described in my prior Letters Patents No. 8729 of
1893 and No. 8043 of 1895, and it consists of a device for heating the feed water.
In the accompanying drawing which illustrates-by way of example—some
methods of carrying this invention into practice: -
Figure 1 Sheet No. 1 is a broken view in longitudinal section
Figure 2 Sheet No. 1 is a view in transverse section, and
Figure 3 Sheet No. 1 is a view in sectional plan showing the invention as applied
to a continuous water chamber.
Figure 4 Sheet No. 1 is a broken view in transverse section showing an alter-
native construction, and
Figures 5 and 6 Sheet No. 1 and Figures 7, 8 and 9 Sheet No. 2 are views
showing alternative methods of applying the invention to a water chamber con-
sisting of a group of separate self-contained elements, as specified in my prior
Patent No. 8729 of 1893.
Throughout the views similar parts are marked with like letters of reference.
Referring to Figures 1, 2 and 3 a supplemental chamber A is formed in the
upper part of the water chamber X by means of a diaphragm or plate B, which is
furnished with any suitable form of valve C that will open or allow the water to
pass from the chamber X into the chamber A when the pressure is equal in both,
but closes when the pressure is greatest in the chamber A.
The supplemental chamber A may either be a short one as shown extending
through only a portion of the length of the water chamber X, or it may extend
through the whole length thereof.
A convenient form of valve is an ordinary clack or flap valve C as illustrated by
Figures 1, 2, 3, 4, 5, and 6.
The feed pipe D enters the supplemental chamber A so that the feed water is
delivered above the diaphragm or plate B, and as the pressure is thereby greater
in the chamber A than in the chamber X, the valve C remains closed so that the
feed water is forced to pass through the water tubes a, a, etc. above the diaphragm
or plate B, whereby it is heated before it begins to circulate through the remainder
of the water a¹, x¹, etc. below the diaphragm or plate B.
When the water is not being fed into the supplemental chamber A the pressure
is the same on both sides of the diaphragm or plate B and therefore the valve C
will be in equilibrium thus allowing the water to circulate through the whole of
the water tubes.
Instead of mounting the valve C into the diaphragm or plate B within the
water chamber or its equivalent, it may be contained in a separate box F. in com-
munication with both of the chambers A and X, by means of suitably arranged
pipes and F³, as shown by Figures 4 and 5. The feed water pipe D is in this
case connected to the valve box F.
In applying this invention to the generator specified in my prior Patent
No. 8729 of 1893, in which the water tubes are arranged in groups and are con-
nected both to the steam collector and to the water chambers by means of boxes

page_text: and connecting pipes, I form or fix the plate or diaphragm B containing the
valve across one of the tube boxes Y as shown by Figures 5 and 6.
An obvious modification is to make one of the tube boxes the supplemental
chamber in which case the valve C may either be mounted in the pipe y con-
necting the tube box Y with the water chamber X as shown by Figure 7 Sheet
No. 2, or in a valve box F' outside the tube box forming the supplemental
chamber A and in connection both with the said box and with the adjacent box,
as shown by Figures 8 and 9 Sheet No. 2.
This device for heating the feed water may be arranged either in connection
with the water chamber on one side of the boiler or with the water chamber on
both sides of the boiler.
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) A feed water heating device for water tube boilers which comprise a steam
separator, two or more water chambers, one or more circulating pipes, and groups
of tubes connecting the water chamber with the steam separator, consisting of a
supplemental chamber in one or both of the water chambers or their equivalents
into which the feed water is delivered, the said chamber being in communication
with the steam collector by a group of water tubes, and with the water chamber
or chambers by a non-return valve, as and for the purpose set forth.
(2) A form of construction of the feed water heating device specified in the pre-
ceding claim in which one of the tube boxes forming part of a self-contained
element is employed as the supplemental chamber, as set forth.
Dated the 1~11
1000
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.