An Improved Steam Jet Nozzle.
Year: 1892

page_text: Date of Application, 26th Oct., 1892
Complete Specification Left, 13th Mar., 1893-Accepted, 6th May, 1893
PROVISIONAL SPECIFICATION.
An Improved Steam Jet Nozzle.
I WILLIAM ARTHUR GRANGER of 15 Foulden Road Stoke Newington
London N. Engineer do hereby declare the nature of this invention to be as
follows:-
:-
My invention relates to an improved nozzle for inducing or producing currents
of air and the like by means of a jet of steam, air or other fluid under pressure and
is more especially suitable for use in connection with stimulating or forcing the
draught of boiler and other furnaces.
Hitherto nozzles for such purposes have had but one outlet or jet, the area of
which is usually incapable of adjustment, consequently with such nozzles no
efficient means is available for varying the strength of the draught or air current.
Now my improved nozzle is constructed with two outlets for the escape of two
jets (preferably concentric) one issuing centrally and preferably cylindrical or
annular in form and the other surrounding the first and being of annular shape.
Both outlets may be made adjustable in area, though for ordinary purposes it is
only necessary to make the second one so adjustable, inasmuch as its duty is to
supplement the effort of the first jet to a greater or less extent as may be necessary
from time to time and under varying conditions.
I prefer to obtain the adjustment of area by means of a conical plug moveable
lengthways in the outlet and which according to its position opens or closes the
orifice more or less. The movement of this conical plug is best accomplished by
means of a screw and handle or hand wheel. Graduations and a suitable pointer
or spring catch may be provided to facilitate and define the adjustment.
Dated this 26th day of October 1902
WILLIAM A. GRANGER.
COMPLETE SPECIFICATION.
An Improved Steam Jet Nozzle.
I, WILLIAM ARTHUR GRANGER of 15 Foulden Road Stoke Newington
Loudon, 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:-
My invention relates to an improved nozzle or injector for inducing or producing
currents of air or the like by means of a jet of steam, air or other fluid under
pressure and is more especially suitable for use in connection with stimulating or
forcing the draught of boiler and other furnaces.
Hitherto nozzles for such purposes have had but one outlet or jet, the area of
which is usually incapable of adjustment consequently with such nozzles no means
is available for varying the strength of the draught or air current, except the crude
method of throttling the supply of working fluid by a cock or valve, which opera-
tion greatly impairs the impact of the jet upon which its efficiency so much depends.
Now my improved nozzle is constructed with two outlets or orifices for the escape
of two jets (preferably concentric) one issuing centrally and preferably cylindrical
or annular in form and the other surrounding the first and being of annular shape,
while one or both outlets may be made adjustable in area, the adjustment being
facilitated and defined by a pointer and graduations or the like.
In the accompanying drawings of my improved nozzle-
Fig. 1 shows a front elevation; Fig. 2 a longitudinal section; Fig. 3 a modified
method of adjusting the area of the central jet; and Fig. 4 a side elevation partly

page_text: in section and showing the nozzle with only the area of the outer jet adjustable;
together with modifications in the shape of the taper adjusting plug and the type of
the graduating arrangement.
The same reference letters are used in all these figures to denote similar parts of
the nozzle.
-
Referring to Figs. 1 and 2 A is the central and B B the outer orifice both being
shown of annular shape and with their areas adjustable by means of the longitu-
dinal movement of the taper plugs D and E respectively, the orifices becoming
larger as the plugs are moved towards the right and smaller as they are moved
towards the left hand. This movement of the taper plugs I prefer to effect by
means of the screw threads F and G formed upon their stems and working in
suitable nuts H and I, the larger plug being rotated by the cylindrical sleeve J
(having a milled hand rim K) keyed upon it and which serves also to define the
adjustment or position of the plug by means of a pointer L in connection with a
dial M upon which suitable graduations are marked The screw thread G may be
of a coarse pitch so that one revolution of the plug and sleeve will suffice to fully
open or close the orifice B B, while any less movement will proportionately open or
close it. In place of the pointer and dial, I sometimes prefer to use the edge of the
sleeve J in conjunction with the graduations N or N and P as shown in Fig. 4 ;
and the smaller taper plug D may be moved and adjusted by either of the foregoing
methods or in the simpler manner shown. The stuffing box Y, Fig. 2, is to prevent
the backward escape of the working fluid after it enters the body of the nozzle.
Fig. 3 shows another method of adjusting the area of the central orifice which in
this case is not of annular form. When the parts are in the position shown the
orifice A is of its maximum size, but when the plug D, having the hollow end R,
is thrust forward (in the direction of the arrow) till the shoulder S is seated on T
the orifice has then only the arca due to the size of R. It will be understood that
the working fluid passes through the side hole U and issues from A in the first
case and through U and W and issuing from R in the second case. The longi-
tudinal movement of D may be effected by a screw arrangement "similar to Fin
Fig. 2 or by any other suitable means.
In Fig. 4 the central orifice A is not annular nor is it adjustable in area, this
type of nozzle being of a simpler design and having the plug E tapered in the.
opposite direction to that in Fig. 2, the extent of its movement being shown by the
edge of the sleeve J travelling over the graduations N on the cylindrical body of
the nozzle, the adjustment being further facilitated by the circumferential divi-
sions P on the sleeve which may be brought into alignment with a fixed zero line
such as band thus define fractional parts of a revolution of the sleeve and conse-
quently very small longitudinal movements of the taper plug. ff, are ribs on the
plug to keep it concentric.
When in operation the steam or other working fluid enters at V (Figs. 1, 2 & 4)
and passes to the interior of the nozzle as shown by the arrows in Fig. 2, and from
thence a portion issues at A, and a portion at B B, thus forming two jets of an
arca determined by the longitudinal position of the two taper plugs D and E.
The combined action of the two jets produces a powerful result with a minimum
consumption of the working fluid while the strength of the action is under perfect
control by means of the mechanism for adjusting the area and consequently the
effort of the jets.
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
(1) In an injecting or ejecting nozzle, the combination of one plain (solid) and
one annular jet or orifice, one or both being adjustable in area substantially as
described and set forth.
(2) In an injecting or ejecting nozzle the means or method of altering the area

page_text: (3) In an injecting or ejecting nozzle having one or more adjustable jets or
orifices the combination therewith of the means or method of defining the adjust-
ment, consisting of the sleeve J with the pointer L & dial M, shown in Figs. 1
and 2; or of the sleeve J and graduations N shown in Fig. 4; or of equivalent
arrangements substantially for the purpose set forth.
(4) The general arrangement and combination of parts constituting the improved
injecting or ejecting steam jet nozzle constructed substantially as described and
shown in the drawings Figs. 1, 2 and 4.
W. A. GRANGER.