Improvements in Injectors.
Year: 1893

page_text: Date of Application, 11th July, 1893-Accepted, 26th Aug., 1893
Improvements in Injectors.
I, PARKER PILLSBURY HOGUE of 400 West 4th Street, Cincinnati, in the
State of Ohio, United States of America, Manufacturer, 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 :-
My invention relates to improvements in injectors for steam boilers and its object
is to provide a novel and a new construction of the same whereby superior results
are obtained with respect to efficiency in operation.
. The invention consists in the novel construction and combination of parts herein-
after fully described and claimed.
In the accompanying drawings:
Figure 1 is an elevation of an injector constructed in accordance with my
invention;
Figure 2 is a central longitudinal section of the same;
Figure 3 is a cross section on the line a-x, Figure 1.
In the said drawings the reference numeral 1 designates the shell or case of the
injector comprising two barrels, an upper barrel 2 and a lower barrel 3. The
numeral 4 designates the steam supply pipe or tube adapted to be connected with a
boiler, and communicating with the steam jet pipe 5, located in the upper barrel.
This pipe is formed with the usual flaring mouth 6, and also a cylindrical counter-
bore 7, to receive the needle pointed end of a cylindrical valve 8, connected with
an operating lever 9, pivoted to a bar 10 secured to the injector case. Passing
through a slot in this lever is a bar 12, pivoted to the injector case and formed
with a series of notches with which engages a spring actuated latch pivoted to said
lever. The object of the counter-bore in the steam jet pipe is to aid in making a
steam tight joint when the valve is closed. Located in front of the steam jet pipe
is the water lifting tube 13, and in front of this tube is the combining tube 14,
communicating with the delivery tube 15 leading to the boiler. The numeral 16
denotes the water supply tube connected with any suitable source of water supply.
Communicating with the upper barrel, just in front of the water lifting tube is an
exhaust chamber 17, leading to the lower barrel and communicating by means of a
wing valve 18, with a chamber or passage-way 19 leading around and above the
combining tube. In front of the combining tube the upper barrel is formed with
openings 20 communicating therewith and also with an exhaust chamber or passage
way 21 leading to and communicating with the chamber 19. The lower walls of
this chamber are formed with apertures in which is seated the horizontally movable
wing valve 18, and in the upper end of the chamber is a vertically movable
valve 23, by which communication is opened and closed with a chamber passage-
way 24, extending around the upper and lower barrels and communicating with the
atmosphere at the under side of the lower barrel.
The numeral 25 designates a removable screw plug to allow the valve 18 to be
inserted in place and also forms a stop for said valve.
The operation is as follows:
Steam is admitted into the steam jet through steam supply pipe by unlatching
the handle and by backward movement thereof opening the needle valve. The
steam will pass through the water lifting tube and through the combining tube and
down through exhaust chamber 17, moving valve 18 off its seat and establishing
communication with exhaust chamber 19, as also does the steam which passes
through the combining tube and escapes through the openings 20 into the
chamber 21. The steam thus admitted to the chamber 19 passes up around the
combining tube, out of relief valve 23, into chamber 24 and down and around
the two barrels and out into the atmosphere.

page_text: When the steam has passed through the jets and exhaust chambers a sufficient
length of time to exhaust the air from the pipe connected with water supply, the
water will flow up to the injector through the lifting tube and the greater portion
of it will pass through the combining tube, ont through the openings 20, down
through exhaust chamber.21, into chamber 19, closing check valve 18, and holding
it to its seat until the water gets sufficient velocity to overcome the boiler pressure.
It will then continue on through the delivery tube into the boiler and as the water!
ceases to flow through the chambers 17, 21 and 19 valve 18 is left submerged in
water and remains seated until the device is stopped or started or by accident the
water supply ceases.
In locating valve 18 underneath the relief valve a great advantage is gained in
that should any dirt get on the seat of the valve 18, and relief valve should seat
properly the injector would work with good results, but should there be an
independent opening out into the air, the injector would not work, and such result
would also follow should the relief valve from any cause be held from its seat.
It
will therefore be seen that the injector has two chances in which to work, and that
the check valve 18 is especially advantageous in starting the injector at a low rate
of steam, as it keeps the water from working back through the combining tube.
From the above it will be seen that I provide an injector prompt and energetic
in its action when started and entirely automatic in its operation. Scale, dirt and
other impurities are also prevented from accumulating on the check valve seat so
that said valve when seated always forms a tight joint.
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: :―
In an injector the combination of the two barrels, located one above the other,
and the steam jet, lifting jet and combining tube all in the upper barrel, of the
chamber surrounding the combining tube having a vertically movable valve in its
upper end and an automatic horizontally movable valve at its lower end in said
lower barrel and the chambers at each side of said chamber communicating
respectively with the lifting and combining tubes substantially as described.
Dated this 11th day of July 1893.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.