Year: 1885

page_text: I, JOHN MILLER, of the firm of Smith Brothers and Company, of Hyson Green,
Nottingham, Nottinghamshire, Brassfouuders 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 injectors for feeding water to boilers and it has
for its object the construction and arrangement of such apparatus in an economical
simplified and improved manner whereby a comparatively small sized injector is
enabled to do the work at present requiring a larger sized injector.
In injectors as principally constructed there is a movable coned part which is
usually arranged to be adjusted by a hand wheel when starting the injector and the
"overflow" is usually formed in a separate metal piece screwed on to the part of
the injector carrying the movable coned part, and has this objection that the spindle
of the valve fitted to the opening for the "overflow" is directly in the passage for
the water. With injectors as commonly constructed some considerable skill is
required for starting the apparatus and an experienced workman is necessary
whereas this Invention aims at the production of a simplified and equally effective
apparatus which may be put into action by any person of fair ability.
In carrying out the Invention the double coned part (hitherto adjustable with
relation to the steam nozzle) is formed in one piece and has at its upper end the
usual passage for the water, into which the metal forming the upper one of the
double cones projects so as to be slightly above the lower end of the steam nozzle
which projects into it in the usual manner. The lower end of this double cone piece
ends in an annular enlargement having the usual flanges for attachment and into this
enlargement the metal forming the lower cone projects just past an opening in the
side of the enlargement, which opening forms the overflow passage being fitted
with suitable hand wheel and stop cock arrangements. The parts for admitting and
passing steam may be of any ordinary well known arrangement suitable for being
fitted to the foregoing improved arrangements for the passage of the feed water.
By arranging the metal forming the cones so as to project into annular spaces as
herein stated the proportionate length of the cones required for the effective working
of the injector is obtained with a much smaller sized injector than injectors of
equal efficiency as hitherto constructed. And in order that my said Invention and

page_text: the manner of performing the same may be properly understood I hereunto append
a sheet of explanatory drawings to be hereinafter referred to and representing my
improved injector.
The accompanying drawing is a full sized longitudinal section of my improved
injector shown as arranged for connection to a steam boiler. The steam inlet, 1, is
cast with parts for carrying the usual spindle for stopping and regulating the steam
and has the usual flanges for connection a small rebate being formed round the
opening, 2, to receive the flanged end of a metal nozzle, 3, into which the regulating
spindle, 4, enters. This nozzle, 3, projects into an annular water passage, 5, in a
casting, 6, which casting is connected by flanges to the steam part in a well known
manner. This casting, 6, is formed to constitute the water passage and consists of
a central passage forming the double cones, 7, 8, communicating from the passage, 5,
to an annular enlargement, 9, in the casting, 6. The metal forming the coue, 7,
projects upwards into the passage, 5, to just beyond the lower end of the movable
nozzle, 3, which it encircles leaving room for the passage of the water. The metal
of the lower cone, 8, likewise projects like a short flange into the annular
enlargement, 9. With this arrangement of the metal forming the cones, 7, 8,
projecting into annular spaces the proportionate length of the cones required for the
effective working of the injector is obtained with a smaller body or shell than has
hitherto been possible whilst its efficiency according to the relative size of its
working parts is fully maintained as compared with injectors as ordinarily
constructed. This enlargement, 9, has an opening, 10, fitted with an adjustable.
stop cock, 11, and forming the "overflow" this opening being arranged for having
suitable piping attached for carrying off the "overflow" water. The spindle of the
stop cock, 11, being fitted to an outlet at right angles to the line of passage of the
water leaves a free passage for the water. By casting the water inlet the double
cones and an outlet or overflow passage, arranged as herein before described and
shown in the drawings in one piece, considerable economy of time and material in
manufacture is effected.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed 1 declare that what
I claim is
(1.) In injectors for steam boilers the combination and arrangement, with the
parts for admitting steam, of a casting (6) having a water passage (5) communi-
cating through a double coned passage (7, 8,) with an annular enlargement (9)
having in its side an overflow opening (10) all arranged and operating substantially
as and for the purposes hereinbefore described.
(2.) The combination and arrangement of parts forming a steam injector sub-
stantially as herein before described with reference to the accompanying drawings.
Dated this fifteenth day of September 1885.