Improvements in Injectors.
Year: 1892

page_text: Date of Application, 4th Nov., 1892-Accepted, 10th Dec., 1892
COMPLETE SPECIFICATION.
Improvements in Injectors.
I, OTTOCAR LINDEMANN, Engineer of 86 Queen Street Cheapside London E.C..
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 steam-jet injectors having two or more concentric steam
cones or nozzles, and one water inlet, and my improvement consists in making a slit
or opening in the combining cone or nozzle of such injectors near the point where-
the second steam nozzle ends, and surrounding this opening by a special chamber,
the said chamber having a connection with the outside atmosphere, by the medium
of a back-pressure valve which opens outwardly from the chamber.
The construction of such a steam-jet injector is clearly shown by the accoin--
panying drawing: 1 is the steam inlet to the inner steam nozzle a, the inner
cone of which is connected by holes c c to the outer steam nozzle a¹. k is the water-
inlet to the annular space b. b., through which the water passes into the upper
part d. d of the combining nozzle, where it receives its first impulse from the steam.
issuing from the nozzle a¹ through the annular space between the inside of the
nozzle a', and the outside of the nozzle a. The ring shaped jet of water then.
springs across the opening mn into the lower part e of the combining nozzle, where
it combines with the steam from the second, central steam nozzle a, and receives.
additional velocity to enable it to pass into a steam boiler under pressure or to
overcome any similar resistance. Between the combining nozzle e and the pressure
cone g there is provided an overflow f having a connection with the outside by the
opening in the outer casing of the injector. The slit or opening m is surrounded
by a special chamber i, which has a back pressure valve n, opening outwards in such
way that steam or water passing through the opening m may readily escape into
the open, whilst on the other hand the valve prevents any air passing from the
outside into the combining nozzle.
The method of working of the apparatus is as follows:-
When the valve on the steam supply is opened, and steam issues from the two.
steam nozzles, the ring shaped jet from the first, outside nozzle produces a partial
vacuum in the combining nozzle d. This vacuum is not appreciably affected by
the jet of steam which is issuing simultaneously from the central steam nozzle a,.
as the steam from. both nozzles has free escape through the overflow f, and the
opening m. When in consequence of the vacuum the water is drawn into the
combining nozzle, the steam condenses, and there is also produced at the opening m
a partial vacuum, which causes the valve n to close automatically, and the injector
then works exactly as it would if there were no opening in the combining nozzle.
The first, outside steam nozzle serves in some degree as a regulator when the
injector works with varying steam pressures, for, with rising steam pressure, it
supplies more, and with falling steam pressure less water to receive the necessary
impetus from the steam issuing from the central steam nozzle.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1st. In connection with steam jet injectors having two or more concentric steam
nozzles of various lengths, the arrangement of a slit or opening in the combining
nozzle near the end of the second steam nozzle, this slit or opening being
surrounded by a special chamber having connection with the outside atmosphere.

page_text: 2nd. In combination with steam jet injectors as described in my first claim, the
arrangement of a valve opening outwardly in connection with the chamber
surrounding the opening in the combining nozzle.
Dated this 3rd day of November 1892.
OTTOCAR LINDEMANN.