Improvements in Apparatus for Producing Currents in Air, Water, or other Fluids.
Year: 1892

page_text: Date of Application, 4th June, 1892
Complete Specification Left, 13th Jan., 1893-Accepted, 18th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Producing Currents in Air, Water,
or other Fluids.
We, HERBERT COWARD of 110 Leadenhall Street, in the City of London,
Consulting Engineer, and WALTER LAWRIE MCNAY of 1 Whittington Avenue,
in the City of London, Engineer, do hereby declare the nature of this invention
to be as follows:
This invention relates to jet nozzles to be operated by fluid pressure usually
compressed air or steam for the purpose of causing the circulation of other fluids,
air for ventilating purposes, particularly.
In carrying out the invention I may employ a preferably cylindrical shell having
an internal annular passage to which the fluid pressure is introduced. The outer
end of this shell may be preferably somewhat reduced so as to prevent the passage
beyond a certain distance of an internal tube which may be inserted from the back
end after which a cover may be screwed on to close in the shell. The tube is
intended to slide longitudinally in the shell and has secured to it the nozzle which
is provided with a number of small peripheral recesses so as to allow of the passage
of the fluid pressure between the nozzle and the tube, or instead of these separate
openings a single annular space may be provided. This nozzle is preferably
extended and tapered to a point and the internal arrangement is such as to
provide a tapering annular cavity inside.
:-
The tube is adapted to fit fluid tight within the shell but can be moved longi-
tudinally therein and is provided with passages or openings so as to allow of the
entrance of the pressure between the tube and the nozzle which in the portion
inside the tube may be tapered in the reverse direction to that of, its outer portion.
A screw which may be provided with a milled head or other means of turning it passes
through the cover of the shell and is connected with the tube and nozzle so that
it can turn round without turning them, but will cause them to move longitudinally
with it. If desired a spring may be introduced in the arrangement between the
screw and the tube or nozzle. The operation is as follows -When the apparatus
is working the compressed air or other fluid enters by a suitable branch and fills
the annular recess in the shell from which it passes by the ports or passages
provided for that purpose to the interior of the tube and so escapes between the
tube and nozzle; the position of the tube may be so altered by the screw as to
bring the passages to properly coincide with the annular recess or they can be
moved partly or entirely clear thereof whereby the amount of compressed air
passing can be regulated or it can be shut off entirely, the apparatus then acting
as a valve. Where the spring is cmployed the operation of the apparatus may he
more or less automatic.
Did thin 2nd day of June 1900
W. P. THOMPSON & BOULT,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Producing Currents in Air, Water,
or other Fluids.
We, HERBERT COWARD of 110 Leadenhall Street, in the City of London,
Consulting Engineer, and WALTER LAWRIE MCNAY of 1 Whittington Avenue,
in the City of London, Engineer, do hereby declare the nature of this invention
[Price Bl

page_text: 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 jet nozzles through which fluid under pressure usually
compressed air or steam passes for the purpose of causing the circulation of other
fluids, air for ventilating purposes, particularly.
In carrying out the invention we may employ a preferably cylindrical shell
having an internal annular passage to which the fluid pressure is introduced. The
outer end of this shell may be preferably somewhat reduced so as to prevent the
passage beyond a certain distance of an internal tube which may be inserted from
the back end after which a cover may be screwed on to close in the shell. The
tube is intended to slide longitudinally in the shell and has secured to it the nozzle
which is provided with a number of small peripheral recesses so as to allow of the
passage of the fluid pressure between the nozzle and the tube, or instead of these
separate openings a single annular space may be provided. This nozzle is
preferably extended and tapered to a point and the internal arrangement is such as
to provide a tapering cavity inside.
The tube is adapted to fit fluid tight within the shell but can be moved longi-
tudinally therein and is provided with passages or openings so as to allow of the
entrance of the pressure between the tube and the nozzle which in the portion
inside the tube may be tapered in the reverse direction to that of its outer portion.
A screw which may be provided with a milled head or other means of turning it
passes through the cover of the shell and is connected with the tube and nozzle so
that it can turn round without turning them, but will cause them to move longi-
tudinally with it. If desired a spring may be introduced in the arrangement
between the screw and the tube of nozzle. The operation is as follows: When
the apparatus is working the compressed air or other fluid enters by a suitable
branch and fills the annular recess in the shell from which it passes by the ports or
passages provided for that purpose to the interior of the tube and so escapes
between the tube and nozzle; the position of the tube may be so altered by the
screw as to bring the passages to properly coincide with the annular recess or they
can be moved partly or entirely clear thereof whereby the amount of compressed
air passing can be regulated or it can be shut off entirely, the apparatus then
acting as a valve. Where the spring is employed the operation of the apparatus
may be more or less automatic.
The invention will be best understood by reference to the accompanying drawings
in which
Fig. 1 is a view partly in elevation and partly in longitudinal section on the
line 1-1 of Fig. 3, the valve in Fig. 1 being shown fully open.
Fig. 2 is a view partly in side elevation and partly in section showing the valve
closed.
Fig. 3 is a view partly in elevation and partly in transverse section on the
line 3-3 of Fig. 1.
Like letters iudicate like parts throughout the drawings.
In carrying out the invention we may employ a preferably cylindrical shell A
having an internal annular passage A¹ to which the fluid pressure is introduced
through a pipe connected with the branch or socket A' or in any other convenient
manner. The outer end of the shell A may be preferably somewhat reduced as
at A³ so as to prevent the passage beyond a certain distance of the internal tube B
which is provided with a shoulder B' to engage with the inner face of A³ when the
tube B has reached its outermost position. The tube B may be inserted from the
back end of A before the cover C, which can be screwed into A, is placed in
position. The tube B is intended to slide longitudinally in the shell A and has
secured to it the nozzle D which is preferably formed hollow as shown in Figs. 1
and 3 and screwed into the back end of B. The external diameter of the main
part of the nozzle D located within the tube B is smaller than the internal
diameter of B so that an annular space or passage E is left between B and D,

page_text: this passage extending back as far as the ports B' in tube B. At the part of D
located within the front end of B is provided a rinn or collar D¹ having grooves D'
to admit of the fluid under pressure passing from the passage E to the front of
the nozzle as indicated by the arrows in Fig. 1. The front end of D is closed
and tapered down as at D³ in the manner shown. Into the back end of D is
screwed a plug F which is provided with a yoke F¹ to which is swivelled or
pivotted the inner end of the screw G which engages with a screw thread in the
cover C and at its outer end is provided with a milled head or equivalent G¹.
The tube B is adapted to fit fluid tight within the shell A, but can be moved
longitudinally therein by means of the screw G.
-
The operation is as follows:- When the apparatus is working compressed air or
other fluid enters through A' and fills the annular recess A' in the shell A. from
which it passes by the ports or passages B' to the interior of the tube B and
around the part of the nozzle D located within B and thence through the
recesses D² to the outside of the apparatus; the position of the tube B may be so
altered by the screw G as to bring the ports or passages B2 to properly coincide
with the annular recess A¹ as shown in Fig. 1 or these ports can be moved partly
or as shown in Fig. 2 entirely clear of the annular recess A' whereby the amount
of compressed air passing can be regulated or when in the position shown in Fig. 2
can be cut off entirely, the apparatus then acting as a valve.
If desired a spring may be introduced between the screw G and tube B or
nozzle D so that the operation of the apparatus may be more or less automatic.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1. A jet nozzle or device adapted to act as a valve substantially as and for the
purpose described.
2. In apparatus such as described the employment of a closed tapered nozzle
such as D substantially as described and illustrated in the accompanying
drawings.
3. In apparatus such as described the combination with a shell A having an
annular recess such as A' of a tube such as B fitted tightly but longitudinally
movable therein and having ports such as B2 and a screw for moving the tube B
substantially as and for the purpose described and illustrated in the accompanying
drawings.
4. In apparatus such as described the combination with a shell such as A A³
having an annular recess such as A' and a tube such as B B' with ports B² of a
nozzle such as D' D' D' substantially as described and illustrated in the accom-
panying drawings.
5. In apparatus such as described the combination with a shell such as A having
an annular recess such as A' of a tube such as B with ports B2 and nozzle such
as D D D the external and internal diameters of D and B respectively being
such as to provide an annular space or passage such as E substantially as described
and illustrated in the accompanying drawings.
6. The combination and arrangement of parts constituting the complete
apparatus for producing currents in air water or other fluids substantially as
described and illustrated in the accompanying drawings.
Dated this Twelfth day of January 1893.
HERBERT COWARD.
WALTER LAWRIE MCNAY.
W. P. Thompson & Boult,
Agents for the Applicants.