Improvements in Injectors.
Year: 1899

page_text: Date of Application, 6th July, 1899
Complete Specification Left, 8th Mar., 1900-Accepted, 14th Apr:,
1900
161
13
PROVISIONAL SPECIFICATION.
Improvements in Injectors.
I, ROBERT GRUNDY BROOKE, of Upton Grange, Macclesfield, in the County of
Chester, Engineer, do hereby declare the nature of this invention to be as
follows:-
رد.
This invention relates to injectors of the type known as combination injectors
and it has for object to enable such injectors to work with much greater
certainty and with hotter feed water than has been usual with injectors of the
kind referred to as heretofore constructed.
For this purpose the back pressure valve according to the present invention
instead of being arranged in a secondary clamber as usual is arranged to act
directly on the outer end of the delivery cone, being guided by a cap, which
closes the corresponding end of the injector casing. By this means the deli-
very passage from the delivery cone to the delivery outlet of the injector can
be made shorter and more direct. than usual; thereby reducing the resistance
to the flow of water therethrough and enabling the injector to work efficiently
with warmer feed water or under more difficult conditions than it otherwise
would do.
For draining off hot water of condensation, due to leakage past the steam
valve and delivery valve whilst the injector is at rest; the injector is provided
with a drain outlet controlled by a spring valve that is normally open to allow
of water draining away but which will automatically close to prevent escape
of steam whenite injector is in action. To admit of the steam cone, being
readily put in place and removed in a simple and easy manner, the water supply
and overflow passages are arranged to one side of the axis of the steam. cone.
In one arrangement of combination injector according to, this invention, the
part of the injector casing carrying the steam cone, the two parts of the com-
bining 'cone and the delivery cone is so arranged that the axis of the cones and
the 'axis of the overflow passage are in a plane parallel to a plane containing
the axes of the steam and water inlet passages and the water delivery' passage
so that the two ends of such part of the casing are readily accessible and can be
closed by screw cap. The steam inlet and water delivery passages are parallel
to each other and at right angles to the axes of the steam, combining and
delivery cones, and water supply passage. The steam passage is controlled by
a conical steam valve carried by a spindle extending through a stuffing box
and provided with a regulating wheel or handle. The water delivery outlet is
controlled by a conical stop valve carried by an adjustable screw spindle-pro-
vided externally with a nut or head. The steam passage is connected by a
longitudinal passage with a steam chamber at the outer end of the steam cone.
The water delivery passage is in connection with the space around and at the
end of the delivery cone by a short direct passage. The overflow passage is
arranged at that side of the part of the injector casing containing the steam,
combining and delivery cones that is, further from the flange by which the in-

page_text: jector is secured to a boiler and which is on a branch in which the steam inlet
and water outlet passages are formed.
The outer end of the delivery cone is cupped to receive the back pressure
valve which is made of dise shape and provided with a spindle that works in
a tubular guide formed in an internal extension of the screw cap that closes this
end of the injector casing. To admit of the valve working easily in the guide,
its stem may be formed with a spiral or other groove or grooves by which fluid
can readily enter and leave the space or chamber formed by and between the
outer end of the stem and guide. The steam chamber at the outer end of the
steam cone is closed by a screw cap into which is screwed one end of a drain
pipe the inner end of which is formed with a valve seat against which works a
conical drain valve carried by a. spindle which passes through a guide carried
by the screw cap. To the inner end of the valve spindle is secured a collar
between which and the inner side of the guide is a weak coiled spring which
is adapted to normally hold the drain valve off its valve seat. The arrange-
ment is such that when steam is admitted into the said steam chamber and tends
to escape past the drain valve, it will act to close the valve against the action
of its spring and will hold it closed against its seat whilst the injector is in
use, but when the steam supply is cut off, the spring will automatically open the
valve and allow any condensation water that may enter the steam chamber
whilst the injector is out of action to escape through the drain pipe which is
or may be made as or provided with a cock adapted to be opened and closed by
hand.
improvements in injectors.
I, ROBERT GRUNDY BROOKE, of Upton Grange, Macclesfield, in the County of
Chester, Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
This invention relates to injectors of the type known as combination injectors
and it has for object to enable such injectors to work with much greater
certainty and with hotter feed water than has been usual with injectors of the
kind referred to as heretofore constructed.
▾
For this purpose the back pressure valve according to the present invention
instead of being arranged in a secondary chamber, as usual, is arranged to act
directly on the outer end of the delivery cone, being guided by a cap which
closes the corresponding end of the injector casing. By this means the deli-
very passage from the delivery cone to the delivery outlet of the injector can
be made shorter and more direct than usual, thereby reducing the "resistance
to the flow of water therethrough and enabling the injector to work efficiently
with warmer feed water or under more difficult conditions than it otherwise
would do.
For draining off hot water of condensation, due to leakage past the steam
valve and delivery valve whilst the injector is at rest, the injector is provided
with a drain outlet controlled by a spring valve that is normally open to allow

page_text: of water draining away but which will automatically close to prevent escape
of steam when the injector is in action.
To admit of the steam cone being readily put in place and removed in a
simple and easy manner, the water supply and overflow passages are arranged
to one side of the axis of the steam cone:
Figs. 1 and 2 of the accompanying illustrative drawings are longitudinal
sections taken in planes at right angles to one another shewing a combination
injector constructed according to this invention; Fig. 3 is a vertical_section
taken on the line A-A of Fig. 1. Figs. 4 and 5 are cross sections taken res-
pectively on the line B, B, of Fig. 1 and line C C of Fig. 3.
In this construction of combination injector, the part of the injector casing 1
carrying the steam cone 2, the two parts of the combining cone 3, and the deli-
very cone 4, is so arranged that the axis of the cones and the axis of the over-
How passage 5 are in a plane parallel to a plane containing the axes of the steam
inlet 6, the water inlet passage 7, and the water delivery passage 8, so that the
two ends of such part of the casing are readily accessible and can be closed by
screw caps. The steam inlet passage 6 and water delivery passage 8 are arranged
parallel to each other and extend in a direction at right angles to the common
axis of the steam, combining and delivery cones 2, 3 and 4 respectively and
water supply passage 7, but to one side of such axis. The steam inlet 6 is con-
trolled by a conical steam valve 10 carried by a spindle 11 that extends through
a stuffing box 12 and is provided with a regulating wheel 11ª or handle. The
water delivery outlet 8 is controlled by a conical stop valve 13 carried by an
adjustable screw spindle 14 provided externally with a fixed nut or head 14.
The steam passage 6 is connected by a longitudinal passage 15 with a steam
chamber 16 at the outer end of the steam cone. 2.. The water delivery passage 8
is in connection with the space 17 extending around and located at the end of
the delivery cone 4 by a short direct passage 17".
The overflow passage 5 is arranged at that side of the part of the injector
casing containing the steam, combining and delivery cones that is farthest
from the flange 1 by which the injector is secured to a boiler and which is on
a branch 1 in which the steam inlet passage 6 and water outlet passage 8 are
formed. The water supply passage 7 may, if desired be provided as usual with
a hand regulating valve 7".
The outer end of the delivery cone 4 is cupped (Figs. 1 and 2) to receive the
back pressure valve 18 which is shown as made of disc shape and provided
with a spindle 18ª that works in a tubular guide 19 formed as an internal
extension of the screw cap 20 that closes this end of the injector casing. To
admit of the valve 18 working easily in the guide 19, its stem 18 may be
formed with a spiral or other groove or grooves 18 by which fluid can readily
cuter and leave the space or chamber 18 formed by and between the outer end
of the stem and guide. Any other suitable means may however be adopted
that will admit of the valve stem working freely in its guide.
The steam chamber 16 at the outer end of the steam cone 2 is closed by a
screw cap 21 into which is screwed one end of a drain pipe 22 the inner end
of which is formed with a valve seat 23 against which works a conical drain
valve 24 carried by a spindle 24ª which passes through a guide 25 carried by
the screw cap 21. To the inner end of the valve spindle is secured a collar 26
between which and the inner side of the guide 25 is a weak coiled spring 27
which is adapted to normally hold the drain valve 24 off its seat 23. The
arrangement is such that when steam is admitted to the said steam chamber 16
and tends to escape past the drain valve 24, it will act to close the valve against
the action of its spring 27 and will hold it closed against its seat 23 whilst the
injector is in use, but when the steam supply is cut off, the spring 27 will auto-
matically open the valve 24 and allow any condensation water that may enter
the steam chamber 16 whilst the injector is out of action to escape through

page_text: 0
.....
. J.
the drain pipe 22 which is or may be made as or provided with a cock 22"
hand!
adapted to be opened and closed by
...Having now particularly described and ascertained the nature of the said i
vention and in what manner the same is to be performed, I declare that what
I claim is-
--
1
11-
1. An injector of the kind herein referred to in which the back-pressure valve
is arranged to act directly on the outer end of the delivery cone and' is guided
by the cap that closes the corresponding end of the injector casing, substan-
tially as described with reference to the drawings.
2. An injector of the kind herein referred to in which the steam chamber is
provided with a drain outlet controlled by a spring valve that is normally open
to allow of water draining away, but which, when the injector is. working, is
automatically closed to prevent escape of steam, substantially as described.
3. The improved combination injector constructed, arranged and operating
substantially as herein before described with reference to and shewn in the
accompanying drawings.
Dated this 8th day of March 1900:
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.