An Improved Air Nozzle or Injector.
Year: 1889

page_text: Date of Application, 1st Mar., 1889
Complete Specification Left, 23rd Nov., 1889-Accepted, 11th Jan., 1890
PROVISIONAL SPECIFICATION.
An Improved Air Nozzle or Injector.
I, WILLIAM ARTHUR GRANGER, of 78 Benthal Road, Stoke Newington Common, N.,
Engineer, do hereby declare the nature of this invention to be as follows:-
Nozzles or injectors for the purpose of inducing or producing air currents by
means of a jet of compressed air or other fluid issuing therefrom have hitherto been
.constructed so that the jet issuing from same assumes either an annular or a solid
cylindrical form, the former being the more common and efficient type, which
arrangement however is open to objection by reason of the annular jet being always
necessarily hollow in its centre and consequently non-efficient in its central portion.
To remedy this defect I construct my improved nozzle or injector so that there
shall be more than one annular jet issuing from the nozzle simultaneously, the jets
being preferably concentric and longitudinally a short distance apart. Though in
ordinary sizes of nozzles I prefer to employ two jets (the nozzle then being of a duplex
principle) I do not restrict myself to that number.
The area of the annular outlets can be increased or diminished by moving tapering
plugs up or down on a screwed or other central rod whereon they can be clamped
by means of set screws.
Dated this on day of February food.
JAMES STEVENSON,
Gray's Inn Chambers, 20, High Holborn, London, WC., Agent for Applicant.
COMPLETE SPECIFICATION.
An Improved Air Nozzle or Injector.
William Arthur GRANGER 78 Benthal Road Stoke Newington Common Middlesex
London, N. Engineer, 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 :-
Nozzles or Injectors for the purpose of inducing or producing air currents by means
of a jet. of compressed air or other fluid issuing therefrom, have hitherto been con-
structed so that the jet issuing from them assumes either an annular or a solid cylindrical
form, the former being the more common & efficient type, but it is open to objection
by reason of the annular jet being always necessarily hollow in its centre and
consequently non-efficient in its central portion.
To remedy this defect I construct my improved nozzle or Injector so that there shall
be two or more annular jets of compressed air or other fluid issuing from it simul-
taneously, the jets being preferably concentric and longitudinally a short distance
apart.
Though in ordinary sizes of nozzles I prefer to employ two annular jets (the nozzle
then being of a duplex principle) I do not restrict myself to that number.
And when it is desired to obtain a great inducing or producing power in a small
compass I provide means for supplementing the two or more annular jets by a
cylindrical or other solid form of jet.
I also provide means for readily adjusting the areas of the annular orifices & there-
fore of the jets issuing from them.
In order that my invention may be clearly understood I have annexed a Drawing in
which figure 1 represents my improved nozzle or Injector, it being shown partly in
section; and figure 2 is a cross section of the shell or casing at the line A B in
figure 1. The same reference letters are used to denote the same parts in both
figures.

page_text: In fig. 1C is a cylindrical shell or casing provided with an internal screw thread
at. D for the purpose of attaching the nozzle to a tube or pipe conveying the supply of
compressed air or other fluid. The bar or bridge E forms part of or is otherwise
attached to the shell, and serves for holding the double coned shaped piece FF
centrally with the shell by means of the screwed stem G on the former."
The said piece F F is hollow as shown and has holes L L at its end for affording a
communication with the interior of the shell.
The double coned piece or plug H is held centrally and partially within F F by
means of its screwed stem I..
It will be seen that when the parts are in the positions shown in the Drawing, two
annular orifices JJ and KK are formed, from which the compressed air or other fluid
may issue, as shown by the arrows. When it is desired to use also a cylindrical or
other solid jet, a hole or passage R R may be made in the smaller coned piece H
in order that a cylindrical or other solid shaped jet may issue from the end S of the
nozzle.
The screwed stems G and I afford a means of increasing or diminishing the areas of
the annular orifices by permitting a longitudinal adjustment of the coned pieces F F
and H relative to the shells or casings which surround portions of their length. The
set screws 0, 0, serve to fix or secure the screwed stems after the proper adjustinents
have been made.
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.-
-
First. The employment of two or more annular jets of compressed air or other
fluid, either alone or in conjunction with a solid jet substantially as herein described
and for the purpose of inducing or producing currents of air or other fluids.
Second. The general arrangement of a nozzle or injector having two or more
annular orifices, either alone or in conjunction with a cylindrical or other similar
shaped orifice, substantially as herein described and shown and for the purpose herein
set forth.
Dated this Twenty-third day of November 1889.
C
WILLIAM ARTHUR GRANGER.