IMPROVEMENTS IN INJECTORS
Year: 1882

page_text: LETTERS PATENT to Herbert John Haddan, of Kensington, Middlesex, for
an Invention of IMPROVEMENTS IN INJECTORS A communication to him
from abroad by W. E. Macdonald, of Sandy Lake, United States, and James
Morrison, of Toronto, Canada
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at
the Office of the Commissioners of Patents on the 25th September 1882.
HERBERT JOHN HADDAN, of Kensington, Middlesex,
"IMPROVEMENTS IN
INJECTORS," a communication to me from abroad by W. E. Macdonald of Sandy
Lake, United States, and James Morrison, of Toronto, Canada,
The object of the invention is to produce an injector which can be depended
upon to start immediately that steam is turned on and which can be readily
graded to work against various pressures, and it consists in the peculiar arrange-
ment of two or more lifting and forcing tubes situated within a chamber containing
a reservoir through which the water must pass on its way from the suction to the
discharge pipe. As the readiest way to describe the construction of the improved
injector will be to explain its operation, I shall proceed to do so. The steam enters
the apparatus through the port, filling the steam space, formed within the chamber
on top of the lifting and forcing tubes. The stop valve is first opened permitting
the steam to escape from the steam space, through the passages. The rapid escape
of the steam through these passages exhausts the air from the suction pipe which
communicates through an opening, with the water space. As the air becomes
exhausted the water from the well will naturally follow the same course and as
the water space, communicates with the water reservoir this reservoir is immediately,
filled as it is connected to the forcing tubes. So soon as either of the stop valves
are opened the water being forced into the reservoir is taken therefrom by the
action of the steam passing through the forcing tube when by adjusting a cock
it is directed into the boiler or other point through a discharge port. The cock
may be set so as to take water from both of the forcing tubes or it may be-
adjusted to take water from either of the tubes separately discharging it in any
case through the discharge port. From this description it will be seen that the
injector is constantly primed holding a reserve of water within its reservoir, from
which reservoir the water may if desired, be drawn direct through the opening,
and as there is a constant pressure within the reservoir so long as the stop valve, is-
open a stream of considerable force is at all times available, independent of the.
ordinary discharge port.

page_text: be to explain its operation, I shall proceed to do so.
The steam enters the apparatus through the port, A, filling the steam space, B,
formed within the chamber, on top of the lifting and forcing tubes.
The stop valve, C, is first opened, permitting the steam to escape from the steam
space, B, through the passages, D, and E. The rapid escape of the steam through
these passages, D, and, E, exhausts the air from the suction pipe which communi-
cates through the opening, F, with the water space, G. As the air becomes
exhausted the water from the well will naturally follow the same course and as
the water space, G, communicates with the water reservoir, H, this reservoir is
immediately filled and as it is connected to the forcing tubes, I, so soon as either
of the stop valves, J, are opened, the water being forced into the reservoir, H, is
taken therefrom by the action of the steam passing through the forcing tube, I,
when by adjusting the cock, K, it is directed into the boiler or other point through
the discharge port, L.
As shown in Fig. 5, the cock, K, may be set so as to take water from both of
the forcing tubes or it may be adjusted to take water from either of the tubes
separately, discharging it in any case through the discharge port, L.
From this description it will be seen that the injector is constantly primed,
holding a reserve of water within its reservoir, H, from which reservoir, the water
may, if desired, be drawn direct through the opening, M, and as there is a constant
pressure within the reservoir so long as the stop valve, C, is open a stream of
considerable force, is at all times available, independent of the ordinary discharge
port, L.
Provision may be made to connect the hose to the opening, M, which hose will
always be ready in case of fire, the pressure within the reservoir being as before
stated, capable of throwing a stream of considerable force.
As shown in the drawing, there are two forcing tubes with necessary connections
placed within the chamber containing the injector as a whole.
As before stated both forcing tubes may be operated simultaneously or separately.
This provision ensures always an effective injector, for should one side become
disabled, the other forcing tube will be available. As the lifting tube is separated
from the forcing tubes the quantity of water may be graded to suit the require-
ments of the user by adjusting the valve, C, which regulates the pressure of the

page_text: steam passing through the lifting tube without effecting the pressure of the steam
passing through the forcing tubes. This point is of great importance as by the
arrangement specified the quantity of water may readily be graded without
reducing the pressure required to force the water into the boiler.
What I claim is :
In an injector provided with lifting and forcing tubes working independently of
each other, the combination of a reservoir arranged to receive the surplus water as
it passes from the lifting to the forcing tubes substantially as and for the purposes
specified.
In Witness whereof I, the said Herbert John Haddan, have hereunto set my
hand and seal this 21st day of March A D 1883.
H. J. HADDAN (L.S.)