Improvements in Injectors.
Year: 1890

page_text: Date of Application, 1st July, 1890
Complete Specification Left, 1st Apr., 1891-Accepted, 2nd May, 1891
PROVISIONAL SPECIFICATION.
Improvements in Injectors.
I, ROBERT GRUNDY BROOKE, of 44 Queen's Gate, Blackpool, in the County
of Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
:―
This invention has reference to an improved construction of injector such that
when it is applied to a boiler in position for use, the combining nozzle or a portion
of it, together with the delivery nozzle, or it may be the delivery nozzle only or a
portion of it will be within the boiler, so that the discharge from the delivery
nozzle will take place on the inner side of the boiler shell. The overflow opening
or openings is or are connected by one or more passages in the injector casing with
an overflow outlet or outlets external to the boiler, and the arrangement is such as
to present a neater and more compact appearance external to the boiler, when the
instrument is fixed in position for use than has hitherto been usual.
In one arrangement of this improved injector the casing is formed with a flange
or flanges through which, or one of which, extends the steam inlet, and by which
flange or flanges the injector can be fixed to and partly inside the boiler. That
part of the casing that is at the side of the flange or flanges constituting the outer
side when the injector is in place, is formed or provided with a steam cone, a water
inlet branch, an overflow outlet common to two overflow passages that lead back-
wards, the one to an ordinary overflow and the other to a supplementary overflow,
and two passages connected by a short vertical passage controlled by a non-return
or back pressure valve. There is a supplementary overflow outlet which is provided
with an ordinary hinged and weighted valve. The part of the casing at the inner
side of the flange and which is designed to project into the boiler when the instrument
is fixed for use, carries a portion of the combining nozzle, and also the delivery
nozzle, which is connected to an elongated bush provided with two sets of lateral
openings separated by a diaphragm that may be a screw plug, closing a direct
passage through the delivery nozzle into the boiler, one set of these openings
being in communication with a passage in the casing through which the combined
jet is led backward or outward to one side of the back pressure valve, and the other
set with another passage through which the combined jet is again led forward or
inward after passing the said valve. The valve can be closed when desired by a
screw spindle. The delivery end of the casing is within and in direct communi-
cation with the interior of the boiler and can if desired be provided with a coupling
for a pipe by which the combined jet may be led to any desired part of the
boiler.
In a modified construction the steam inlet passage is adapted to be placed in
communication with the boiler by a detachable pipe. This construction is suitable
for use with boilers where there is not room for a large flange between the heads
of the stay bolts.
The steam nozzle may be so arranged as to be capable of sliding longitudinally
and be so proportioned and disposed in relation to a spindle or part located within
the sliding nozzle and to a second nozzle forming the upper portion of the combining
nozzle, that an internal area in the said sliding nozzle, and also the area between
the exterior of that nozzle and the interior or the end of the second nozzle will be
simultaneously altered by endwise movement of the said sliding nozzle alone, in the
manner described in the Specification of a former Patent granted to me dated
26th May 1888, No. 7742. The longitudinal movement of the steam nozzle can
be effected by a spindle able to rotate but not to move longitudinally and which is
formed with a screw thread that engages with a corresponding internal screw thread

page_text: in the steam nozzle and is provided with an external handle carrying an index
arranged to work over a suitable scale for indicating the position of the nozzle, the
inner end of the spindle being if desired made hollow and formed with lateral inlet
openings all as described in my said former Specification.
An injector constructed with a sliding steam nozzle and revolving spindle as just
mentioned, can be provided with an internal stuffing box through which the inner
end of the steam nozzle can slide as well understood, the injector casing being so
constructed that ready access can be had to such stuffing box. For this purpose
according to one construction I divide the injector casing in a plane situate between
the steam and water inlets, the two parts being provided with flanges or being
otherwise so formed as to admit of ready disconnection for insertion, inspection and
withdrawal of the gland forming one part of the stuffing box.
According to another construction the sliding steam nozzle is arranged to work
in a removable sleeve inserted through the end of the injector casing and formed
with holes for the passage of steam to the steam nozzle.
The steam nozzle at the
part where it is desired to pack it, is made smaller in diameter than the interior of
the sleeve so as to leave an annular space or stuffing box between the two for the
reception of suitable packing material for example asbestos, which is kept tightly
in place by a collar or gland adjustably secured to the steam nozzle, and fitting
within the sleeve. The arrangement is such that the steam nozzle and sleeve can
be inserted within and withdrawn from the injector casing by simply turning the
sleeve which is suitably formed for the purpose. The spindle is fixed longitudinally
between the sleeve and a nut and may be provided with a regulating handle. By
this modified construction a withdrawable stuffing box is provided without forming
a special joint in the injector casing. Such construction can be applied to the ordinary
type of injector with sliding steam nozzle.
According to another construction, the combining nozzle and delivery nozzle are
made in one piece with or connected to a tubular part or sleeve that is adapted to
be inserted in place and withdrawn endwise through the outer end of the injector
casing which is formed with suitable passages for the overflows and combined jet
as in the first described arrangement. The tubular part or sleeve is made with
holes for the passage of water and steam and of the overflow or overflows and is or
may be fitted with a sleeve, sliding steam nozzle, interposed stuffing box and
revolving spindle such as hereinbefore described. The spindle can be made hollow
for part of its length for passage of steam. An injector such as just described may
be provided with a stop valve in addition to the back pressure or clack valve and
may be formed with two flanges, one to carry the main parts of the injector, and
the other to serve as a connection for the steam inlet. If means be provided for
shutting off the supply of steam to an injector constructed with a tubular part or
sleeve, and stop valve as just described, the combining and delivery nozzles can be
withdrawn from the injector casing while the boiler, to which the casing is connected,
is under steam.
Dated this 1st day of July 1890.
W. LLOYD WISE,
Per F. J. Brougham.
COMPLETE SPECIFICATION.
Improvements in Injectors.
1, ROBERT GRUNDY BROOKE, of 44 Queens's Gate, Blackpool, 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 :-
This invention has reference to an improved construction of injector such that
when it is applied to a boiler in position for use, the combining nozzle or a portion
of it, together with the delivery nozzle, or it may be the delivery nozzle only, or a

page_text: portion of it, will be within the boiler, so that the discharge from the delivery nozzle
will take place on the inner side of the boiler shell.
This invention also has reference to improvements
which the steam nome
in injectors of the kind in
Tranged that it can be moved longitudinally for the
purpose of controlling the supply of water or steam or both.
In the accompanying drawings
Figs. 1 and 2 are longitudinal sections taken in planes at right angles to each
other, of an injector so constructed that the delivery nozzle and a part of the
combining nozzle can be placed within a boiler, a part only of which is shown.
and
Fig. 3 is a cross section on the line A B Fig. 1 with the steam cone removed;.
igs. 4, 5 and 6 are cross sections, on the lines CD; E F; and & respectively
purpose of controlling the supply of water or steam or both.
In the accompanying drawings
Figs. 1 and 2 are longitudinal sections taken in planes at right angles to each
other, of an injector so constructed that the delivery nozzle and a part of the
combining nozzle can be placed within a boiler, a part only of which is shown.
and
Fig. 3 is a cross section on the line A B Fig. 1 with the steam cone removed;.
Figs. 4, 5 and 6 are cross sections, on the lines CD; E F; and GH respectively
of Fig. 2.
Fig. 7 shows a modified construction.
Fig. 7 shows a modified method of securing the injector to a boiler.
Fig. 8 is a longitudinal section partly in elevation ard
Fig. 9 a plan, partly in section, illustrating a modified construction of injector
according to this invention.
Fig. 10 is a cross section on the line J. K Fig. 8.
Fig. 11 is a longitudinal section of part of an injector having a longitudinally
movable steam nozzle with removable stuffing box.
Fig. 12 is a longitudinal section illustrating a modified construction of injector.
The casing 1 of the injector shown in Figures 1 to 6 inclusive is formed with a
flange 2 by which the injector can be fixed to and partly inside the boiler, part of
which is shown at 3 and also with a steam inlet branch 4 terminating in a flange 4".
That part of the casing that is at the side of the flange 2 constituting the outer
side when the injector is in place, is formed or provided with a steam nozzle 5; a
water inlet branch 6; an overflow outlet 7 for an overflow passage 8 that leads
backwards or inwards to the ordinary overflow 9; and two passages 10 and 11
connected by a short vertical passage 12 controlled by a non-return or back pressure
valve 13. The part of the casing at the other side of the flange 2 and which is
designed to project into the boiler as shown, when the injector is fixed in position
for use, carries an ordinary combining nozzle 14, having a single overflow 9, and
also the delivery nozzle 15 which is connected to an elongated bush or tubular
extension 16. This bush or tubular extension is formed with two sets of lateral
openings 17 and 18 separated by a diaphragm 19, that may be a screw plug as
shown, closing a direct passage through the delivery nozzle into the boiler. One
set of these openings viz. 17, is in communication with the inner end of the
passage 10 in the casing through which the combined jet is led backward or outward
to one side of the back pressure valve 13, and the other set viz. 18 is in communica-
tion with the inner end of the passage 11 through which the combined jet is again
led forward or inward after passing the said valve. The valve 13 can be held
closed when desired by a screw spindle 20. When the injector is fixed in position
for use, the steam inlet branch 4 is fixed by its flange 4ª opposite one end of a
tube 21 the other end of which extends into the steam space of the boiler. This
branch may be made separate from the casting or casing 1 when required, and it
may be provided with a separate steam valve 4° as shown in Fig. 7. The open delivery
end 22 of the casing is within and in direct communication with the interior of the
boiler, and can if desired be provided with a coupling 23 for a pipe by which the
combined jet may be led to any desired part of the boiler.
By the construction described, the injector presents a neater and more compact
appearance external to the boiler, when the instrument is fixed in position for use,
than has hitherto been usual.
As will be obvious the injector can be adapted to be secured to a boiler in the
position shown in Figs. 1, and 8 by means other than a flange or flanges. Thus
the opening in the boiler to receive the injector may be screw threaded as shown
in Fig. 74, the injector casing 1 being forined with a corresponding external screw

page_text: thread 1" so that the rim 1° on the injector body or casing 1 can be screwed tight's
up against the boiler and so make a secure joint.
It will also be obvious that my invention can be applied to injectors of various
types and that the details of construction can be variously modified. Thus the
injector shown in Figs. 1 to 6 inclusive is of the type adapted to lift its own feed
water at starting. For this purpose there is used in conjunction with the ordinary
combining nozzle 14 having the single overtlow 9, a steam nozzle 5 within which
is a spindle 24 that fills the throat of the steam nozzle at starting and through
the hollow inner end of which a small jet of steam passes, this steam escaping
at the ordinary overflow 9 and creating a vacuum that causes the feed water to
rise. This is a usual method of making an injector of the ordinary or Giffard
type lift its feed water. The combining and delivery nozzles 13 and 14 with
elongated bush 16 are made separate from the casing 1 into which they can be
introduced and secured from the delivery end of the injector.
Figs. 8, 9 and 10 show my invention applied to an injector of the type known as
an automatic self-starting injector in which ordinary and supplementary overflows 9
and 9 are provided for the escape of steam at starting, and the entire jet of steam
from the steam nozzle causes the vacuum necessary for lifting the feed water. The
combining nozzle is shown made in two parts the supplementary overflow 9 being
between them, but it can be otherwise constructed as well understood. The casing 1
is constructed with two overflow passages 8 and 8" leading from the ordinary and
supplementary overflows respectively and terminating in a common outlet 7, the
supplementary overflow being provided with an ordinary hinged and weighted
valve 9. In this construction the portion 14 of the combining nozzle and the
delivery nozzle 15 are shown as made in one piece with a tubular part or sleeve 25
that carries the portion 14" of the combining nozzle and is adapted to be inserted
in place and withdrawn endwise through the outer end of the injector casing. This
tubular part or sleeve 25 is made with holes 26 and 27. for the passage of water
and steam respectively. The inner end of the passage 10 in this case may be closed
with a screw plug 19ª the inner end of the passage 11 being left open and in direct
communication with the boiler. The casing 1 is secured to the boiler by a flange 2
as in Figs. 1 to 7, but is provided with a steam inlet branch 4* that is adapted to
be connected with the steam space of the boiler by a detachable pipe 4*. 3* is a
tube into which the inner end of the injector may extend and which serves to conduct
the feed water from the delivery end of the injector to any suitable part of the
boiler.
An injector such as just described may be provided with a stop valve 28 in addi-
tion to the back pressure or clack valve 13. If a valve be provided on the pipe 4*
for shutting off the supply of steam to an injector constructed with a tubular part
or sleeve 25 and stop valve 28 as just described, the combining and delivery nozzles
can be withdrawn from the injector casing while the boiler to which the casing is
connected, is under steam. The valve may be attached direct to the coupling or
branch 4 if it is not required to employ a detachable pipe 4*, the coupling or
branch being directly connected with the boiler in either of the ways hereinbefore
mentioned.
I prefer to arrange the steam nozzle in each case as shown, so that it is capabie
of sliding longitudinally, and to so proportion and dispose it in relation to the
spindle 24 located within it and to the adjacent end of the combining nozzle, that
an internal area in the said sliding nozzle, and also the area between the exterior
of that nozzle and the interior or the end of the combining nozzle will be simul-
taneously altered by endwise movement of the said sliding nozzle alone, in the
manner described in the Specification of a former Patent granted to me dated
26 May 1888 No. 7742. The steam nozzle is arranged to slide tightly in a bearing
between the steam chamber 4° and water chamber 6ª, and is formed with lateral
inlets 5ª for steam. Its longitudinal movement is effected by the spindle 24 which
is so arranged as to be able to rotate but not to move longitudinally, and which is
formed with a screw thread 29 that engages with a corresponding internal screw

page_text: thread in the steam nozzle, rotary motion of the latter being prevented by a key.
The spindle is provided with an external handle 30 carrying an index 30ª arranged
to work over a suitable scale 31 for indicating the position of the nozzle, all as
described in my said former Specification.
That part 24 of the spindle 24 adjacent to the screw thread 29, may with
advantage be formed as shown to serve as a conical valve seat for a correspondingly
formed surface 5b on the steam nozzle, which thus also acts as a steam valve to
control the passage of steam to its interior. The valve seat 24" thus arranged will
not obstruct the flow of steam through the steam nozzle when the latter is moved
inward and away from its seat by the rotation of the spindle 24, but will leave a
direct and uninterrupted communication between the steam space 4° and the interior
of the steam nozzle. This construction of sliding nozzle with lateral inlet 5* and
seat at 5, and spindle 24 with valve scat at 24ª can be used in injectors other than
those constructed as hereinbefore described for insertion partly within a boiler.
Figs. 11 and 12 shew such an application.
An injector with a sliding steam nozzle and revolving spindle whether constructed
so as to be capable of being secured partly within the boiler as described or not,
can be provided with an internal stuffing box through which the inner end of the
steam nozzle can slide as well understood, the injector casing being so constructed
that ready access can be had to such stuffing box.
Fig. 11 is a longitudinal section of part of an injector having a sliding steam
nozzle and accessible stuffing box according to this invention. 32 is the stuffing
box formed by and between the steam nozzle 5 and a tubular part 32* which is
formed in one piece with one portion of the injector casing 1. This casing is
divided in a plane situated between the steam and water inlets 4 and 6, the two
parts being provided with flanges 1° or being otherwise so formed as to admit of
ready disconnection for insertion, adjustment, inspection, or withdrawal of the
gland 33 of the stuffing box.
Fig. 12 shows in longitudinal section part of an injector with a modified
construction of longitudinally movable steam nozzle and stuffing box according to
this invention.
In this case the steam nozzle 5 is arranged to slide in a sleeve 34 screwed into
one end of the injector casing 1. This sleeve is formed with a polygonal part 35
or equivalent, by which it can be rotated and thus readily removed from the
injector and replaced as required. The steam nozzle 5 is reduced in diameter at
the part 36 so as to leave an annular space between itself and the surrounding
part of the sleeve 34 so as to form the stuffing box 32 for the reception of suitable.
packing material such as asbestos. 33 is a collar or gland that enters the stuffing
box and is screwed upon the inner end of the steam nozzle as shown, so as to be
adjustable thereon for the purpose of compressing the packing material sufficiently
to effect a steam tight joint between the steam nozzle and sleeve.
The steam
nozzle is arranged to be moved longitudinally in the manner hereinbefore described
by a screw threaded spindle 24 which is capable of being rotated but is prevented
from moving endways by a collar 37 fast on the spindle and held between the
sleeve 34 and a nut 38. This nut 38 is constructed as shown, to serve as a stuffing
box for the outer end of the spindle. 6 is the water inlet, and 4 the steam inlet.
This latter inlet can be placed in communication with the interior of the steam
nozzle by slots 5 and 5 formed in the steam nozzle and sleeve respectively. The
admission of steam to the interior of the steam nozzle is controlled by longitudinal
adjustment of such steam nozzle, which acts as a valve, as hereinbefore described.
By the construction described the steam nozzle 5 and sleeve 34 with interposed
stuffing box, can be easily inserted within and withdrawn from the injector by simply
turning the sleeve.
The injector shown in Figs. 8, 9 and 10 is shown with a removable stuffing box
such as last described, the sleeve 34 being screwed into the end of the tubular
extension or sleeve 25 shown in Fig. 8.
•

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. An injector adapted for attachment to a boiler shell in such a manner that
when the injector is fixed in position for use a part of its casing projects into the
boiler to which it is applied, and in which the discharge from the delivery nozzle
within the injector casing passes through a non-return valve, or a screw-down valve,
or both, thence by a passage to that end of the injector casing located within the
boiler, and there the delivery takes place.
2. An injector of the kind referred to in the preceding claim, constructed with
one or more overflow passages leading to an outlet in that part of the injector
that is external to a boiler to which it is applied, passages leading from the external
part of the injector respectively to the inner end of the delivery nozzle and to the
open delivery end of the injector these being connected by a connecting passage,
and a non-return valve arranged to control such connecting passage, substantially
as herein before described.
3. An injector of the kind referred to in the preceding claim, in which the
combining and delivery nozzles are made in one piece with or are connected to a
tubular part that contains the steam nozzle and is adapted to be inserted in place
and withdrawn endways through that part of the injector designed to be external to
the boiler to which the injector is applied substantially as described.
4. An injector, of the kind referred to in the preceding claim provided with a
stop valve adapted to close the passage leading from the non-return valve to the
open delivery end of the injector casing substantially as herein described.
5. My improved injectors substantially as hereinbefore described with reference
respectively to and shown in Figs. 1 to 6 inclusive; and in Figs. 8 to 9 inclusive;
or modified as shown in Fig. 7, or in Fig. 74.
6. In an injector constructed with a longitudinally movable steam nozzle,
making the injector casing with the sleeve 32 to form the stuffing box, as
and for the purpose described with reference to and shown in Fig. 11 of the
drawings.
7. In an injector having a longitudinally movable steam nozzle such as 34, a
sleeve normally fixed but adapted to be removably secured to one end of the
injector and within which the steam nozzle can slide, and a stuffing box located
between the nozzle and sleeve substantially as herein described with reference to
Fig. 12 of the drawings.
Dated this at 1
1001
R. G. BROOKE.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.