Improvements in Injectors.
Year: 1898

page_text: Date of Application, 13th Oct., 1898-Accepted, 19th Nov., 1898
Improvements in Injectors.
I, LOUIS FRIEDMANN, of II Am Tabor No. 6, Vienna, Austria, 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 follow-
ing statement:-
In injectors which have two fixed concentric steam nozzles, the annular opening
between the nozzles sometimes becomes choked, as is also the case with the holes
of the inner nozzle through which the steam enters the said annular opening,
whereby the correct action of the injector is affected.
The clearing of the said opening and holes is in that case difficult, as will be seen
from the sections of a usual form of such injectors at a and b in Fig. 1 of the accom-
panying drawings, as in most cases the steam pipe connection, and with suction
injectors, the steam-spindle screw, have first to be disconnected before the inner
steam nozzle can be withdrawn, and furthermore, the clearing of the small holes
is very tedious.
The present improvements have for their object to obviate the said difficulties,
and they consist essentially in arranging the inner steam nozzle fixed to the nozzle
fittings, that is with the collecting cone, and in arranging it to project with its
end that is directed towards the steam inlet of the injector into the outer steam
nozzle. By this means an annular opening is formed for the steam supply which,
if it becomes clogged with impurities contained in the steam, can be readily cleared
by taking out the inner steam nozzle together with the entire collecting cone
fittings at the discharge end of the injector, so that free access can thus be gained
to the said opening. Figs. 2 to 7 shew longitudinal and cross sections of various
forms of injectors, constructed according to my said invention. In all cases a is
the outer steam nozzle and b the inner one, the latter, in the examples shewn at
Figs. 2, 3, 4, and 6, being rigidly connected with the collecting cone e by means
of the ring c united to b by means of ribs c, as shewn at Fig. 3, which is a cross
section of Fig. 2, and having its rear end projecting into the outer steam nozzle a.
The outer diameter of 6 being made smaller than the inner diameter of a, the
requisite annular opening is formed between the two for the entrance of the steam.
The action of the improved injector is the same as all other injectors operating
with an annular steam jet. The entering water has an increased momentum
imparted to it by the annular steam jet, by means of which it passes through the
first part of the collecting cone, it is then seized by the steam issuing from the
inner nozzle and is propelled, with the necessary momentum for overcoming
the boiler pressure, into the collecting cone e.
Fig. 4 shews an example of a suction injector with my improvement applied
thereto.
In this case the steam does not enter simultaneously through the annular orifice
and the inner nozzle as in Fig. 2, but it passes first through the annular opening,
thereby drawing in the feed water by suction-action, and only afterwards it passes
through the inner steam nozzle, for effecting the feed. For this purpose the
Di Q77

page_text: injector is provided at the inlet end with a spindle f capable of being moved longi-
tudinally, and carrying a valve g that closes the opening of the outer nozzle and a
cylindrical extension or cap h enclosing the rear end of the inner nozzle b. On
drawing back the spindle f, the valve g first opens the annular orifice of the outer
nozzle, and on the further motion of f the cap h is withdrawn from the end of
nozzle so as to allow the steam to enter the latter.
In Figs. 2, 4 and 7 the inner steam nozzle 6 projects free into the outer steam
nozzle, while in the arrangement shewn in longitudinal and cross section at Figs. 5
and 6, the nozzle 6 is supported in a central ring in the nozzle a but without being
fixed thereto. In the arrangement at Fig. 7 the inner steam nozzle b is held by
a ring united to the nozzle by means of ribs c.
It will be seen that in all the above described arrangements, the inner nozzle b
being united with the collecting cone o, and independent of the outer nozzle a, it
can be readily withdrawn together with the collecting cone from the delivery end
of the injector.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. An injector having two concentric steam nozzles wherein the inner steam
nozzle b is fixed to the collecting cones e, d and has its rear end extending loose
into the outer nozzle a, substantially as and for the purpose described.
2. In an injector of the kind referred to in the first claim, the combination with
the concentric steam nozzles, of a spindle f with valve closing the annular orifice
of the outer steam nozzle a and having a tubular cap that encloses the inlet of
the inner steam nozzle, the arrangement heing such that on first drawing back
the spindle the valve only opens the outer steam nozzle while on the further
motion of the spindle, the tubular cap also opens the inner nozzle, substantially
as described
"Dated this 13th day of October 1898.
ABEL & IMRAY,
Agents for the Applicant.