Improvements in Injectors.
Year: 1899

page_text: Date of Application, 16th May, 1899-Accepted, 1st July, 1899
Improvements in Injectors.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, 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 injectors and is applicable to that class thereof in
which the actuating steam is divided into two or more jets. Of this class there
are two divisions, in one of which there is a lifting apparatus provided with a
steam nozzle, a converging combining tube and diverging delivery tube which
discharges the fluid into a conduit which delivers to the receiving end of the
converging combining tube of the forcing apparatus, which is provided with like
parts to those of the lifting apparatus, and which discharges its fluid into a
conduit which carries it to the boiler.
In the other division, there is a lifting apparatus provided with a steam
nozzle and a converging combining tube, but no diverging delivery tube. The
forcing apparatus is provided with a steam nozzle converging combining tube
and a diverging tube; the fluid from the combining tube of the lifting apparatus
is delivered directly into the receiving end of the forcing combining tube, where
it receives a fresh impulse from the steam nozzle of this apparatus, which carries
it through the delivery tube to conduit which delivers it to the boiler. That
is to say, one division has a double jet, while the other division has a single jet
with a double impulse to produce a continuous acceleration of this jet, and my
invention is applicable to both.
In all steam jet apparatus where the converging jet is provided with a lateral
outlet, the jet is more sensitive to external pressure, the larger its diameter at
such outlet, compared with that of the actuating steam jet, and in the double
jet and double impulse injectors this point is the rearmost lateral opening of the
lifting apparatus. In all such steam jet apparatus, when the temperature of the
water supply is raised so that the jet will produce a side pressure upon the walls
of the combining tubes, if there are lateral openings in these walls, spill or over-
flow will first occur at that opening nearest the delivery tube of the forcing
apparatus, and if these openings are in a closed chamber, the pressure upon that
one farthest from this delivery tube, that is, the rearmost lateral opening of the
lifting apparatus, will interrupt the action of the apparatus; therefore, to utilize
the highest temperature of water supply, there must be no communication between
these openings, but under ordinary conditions of water supply temperature, the
rearmost lateral opening of the lifting apparatus may overflow, and if the overflow
can reach the opening nearest the delivery tube of the forcing apparatus, the jet
at this point would absorb this overflow and thereby increase the capacity of the
injector.
It is one object of my invention therefore, to provide communication between

page_text: all of the lateral openings to the jets of such double jet and double impulse apparatus
it is a further object to guard the rearmost lateral opening of the converging jet
of the lifting apparatus, against pressure which may be produced at the opening
near which the converging jet begins to diverge, and it is a further object to
make this communication and this separation at will, and it is a further object
to make this communication and this separation automatic.
To these ends, my, improvement consists in a chamber which encloses the
rearmost lateral opening to the converging jet of the lifting apparatus, from the
chamber which encloses the lateral openings, to the converging jet of the forcing
apparatus; it further consists.in.a.chamber.which encloses the rearmost lateral
opening to the converging jet of the lifting apparatus, from the chamber which
encloses the lateral openings to the converging jet of the forcing apparatus, with
means for closing the outlet from the chamber which encloses the lateral openings
of the foreing apparatus; it further consists in an outlet through a side of the
chamber which encloses the rearmost lateral openings to the converging jet of the
lifting apparatus, to the chamber which encloses the lateral openings of the forcing
apparatus, which outlet may be closed at will; and it further consists in a valve
in the outlet of the chamber which encloses the rearmost lateral opening to-the
converging jet. of the lifting apparatus, which valve opens outwardly under
pressure within this chamber, and which closes under pressure within the
chamber which encloses the lateral openings of the forcing apparatus.
I designate as "forward" parts in relation to each other in the direction of
the motion of the jet, and "rearmost" is in the opposite direction to forward.
In the accompanying drawings in which the same letters refer to similar parts.
The casing of the injector is designated by A, the pipe for the admission of steam
is connected to the branch B, while C is the water supply branch, D is the branch
for the boiler feed pipe, and E is the waste pipe.
Figures and 7 are longitudinal sections of injectors, of which the actuating
steam jets are in the same axial line; Figure 2 is a similar section of part of the
injector shown in Figure 1, with hand closing valve in place of automatic.
Figure 3 is a transverse section upon the line V-V in Figures and 7.
Figure 4 is a longitudinal section of a double jet injector to which my invention
is applied. Figure 5 is a transverse section on the line X-X of Figure 4, and
Figure 6 is a transverse section on the line YY of Figure 4.
is the steam nozzle of the forcing apparatus, and 6 the steam nozzle of the
lifting apparatus; is part of the lifting combining tube which extends to the
end of the steam nozzle a, and dd from the end of the steam nozzle a is the
forcing combining tube. F is a lateral opening of the lifting combining tube c
forward of its receiving end contained in the chamber L, and is a lateral
opening of the forcing combining tube dd forward of its receiving end and con-
tained in the chamber L', communication between the two chambers being controlled
by the hand operated valve H' shown in Figure, 2, or by the automatically acting
valve H in Figures 1, 4, 6 & 7. F is a lateral opening in the forcing combining
tube to make the instrument capable of restarting automatically, but for the object
of this invention it may be neglected, as the pressure tending to break the jet
when the supply water is at too high a temperature, is produced by the final
opening between the combining tube and the delivery tube.
The chamber L¹ is in communication with the air during the operation of
starting the injector by means of the port J, the passage and the waste pipe E
The port J is controlled by the gravity check valve J which prevents admission
of air to the chamber L and which can be held forcibly to its seat by the cam j
operated by the lever . f is the divergent delivery tube of the forcing apparatus.
Referring to Figures 4, 5 & 6, k is the delivery tube of the lifting apparatus; K
is the delivery chamber of the lifting apparatus from which the feed passes by
means of the duct K in the direction of the dotted arrow, into the intermediate
supply chamber K" containing the receiving end of the combining tube dd of
the forcing apparatus.

page_text: In the injector shown in Figure 7, the seat for the automatic valve H is formed
by the enlargement G near the forward end of the combining tube c, which tube
terminates at the end of the steam nozzle a. H is the automatic valve, concave
on its lower side and guided by its cylindrical prolongation h; which slides upon
the exterior surface of the combining tube dd of the forcing apparatus; when
the automatic valve H rests upon its seat G, it forms the chamber L, enclosing.
the rearmost lateral opening of the lifting apparatus, and isolates it from the
opening of the forcing combining tube dd; when the valve H is forced from
its seat by an excess of pressure at F, communication between the two openings F F
is established. When the valve H is forced from its seat by an excess of pressure
at F, it is replaced when this excess is removed, by the spiral spring in the
rear of the enlargement G, which the forcing of the valve H from its seat, com-
presses against a shoulder p on the combining tube.
The operation of my improved injector is as follows: When steam is admitted
to the branch B, the valve b being closed, it discharges through the lifting
nozzle and the lifting combining tube c, raises the valve H and enters the
chamber L', into which chamber a portion of the steam discharged from centers
through the openings in the combining tube dd, from which it all escapes to the
air by lifting the valve J. After the supply water arrives at the end of the lifting
steam nozzle b, it is continuously delivered by the lifting apparatus to the
receiving end of the forcing combining tube dd. If the steam valve is now
opened to admit steam to the second apparatus, the water received from the
lifting apparatus is forced through the combining tube dd and the delivery
tube f of the forcing apparatus into the pipe leading to the boiler.
If the lateral openings of the combining tubes of the lifting and of the forcing
apparatus are suitably located, and of sufficient area relative to the areas of their
respective actuating steam jets, the combined apparatus will be able to restart
automatically after a temporary interruption of the steam or water supply, pro-
vided that the waste valve J is free to rise from its seat and that the area of its
port and of the conjoined outlet duct, permit free discharge of the issuing steam.
When operating with the supply water at ordinary temperatures, the delivery
of the injector is greatest, and its performance is most efficient when the lateral
openings of both combining tubes are in communication.
When the temperature of the water supply is raised to that at which spill
commences to issue from the waste pipe E, it is necessary that the gravity valve J
should be held forcibly upon its seat by a partial rotation of the cam or by other
suitable means, in order that all of the feed water shall be forced into the boiler
feed pipe. This will produce pressure upon the water in the chamber L', which
if it could reach the opening F would interrupt the action of the apparatus.
The pressure in the chamber L will, however, close the valve H, and thereby
prevent this pressure from reaching the opening F. The temperature of the feed
water may then be increased until the pressure in the chamber L' reaches a point
that will interrupt the action of the injector by pressure upon the jet at the
openings F1 and F.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, as communicated to
me by foreign correspondents, I declare that what I claim is;-
1. A chamber which encloses the rearmost lateral opening to the converging jet
of the lifting apparatus, from the chamber which encloses the lateral openings to
the converging jet of the forcing apparatus.
2. A chamber which encloses the rearmost lateral opening to the converging
jet of the lifting apparatus, from the chamber which encloses the lateral openings
to the converging jet of the forcing apparatus, with means for closing the outlet
from the chamber which encloses the lateral openings of the forcing apparatus.
3. An outlet through a side of the chamber which encloses the rearmost lateral
opening to the converging jet of the lifting apparatus, to the chamber which

page_text: encloses the lateral openings of the forcing apparatus, which outlet may be
closed at will.
4. A valve in the outlet of the chamber which encloses the rearmost latéral
opening to the converging jet of the lifting apparatus, which valve opens out-
wardly under pressure within this chamber, and which closes under pressure within
the chamber which encloses the lateral openings of the forcing apparatus.
Dated this on day of May 1899.
HASELTINE, LAKE & Co.,
45, Southampton. Buildings, London, W.C.,
Agents for the Applicant.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.