Year: 1886

page_text: Invention the same end is attained by means of the cylindrical mixing tube. The
average velocity of the fluid throughout this cylindrical tube being uniform, the
difference between the velocity of the air, or other fluid in contact with the jet and
that of the surface of the conical jet of propelling fluid is reduced to a minimum
and thereby the loss of power caused by the aforesaid eddying is also reduced.
The nozzle of the steam, or other propelling jet may be provided with a central
conical spindle for regulating the area of the opening through which the propelling
jet passes, or the said nozzle may be of annular form with a central passage for the
air, or other fluid.
The propelling fluid may be steam, or atmospheric air, or other elastic fluid under
compression.
In the example shown in the Drawings a is the nozzle for the steam, or other
propelling fluid which is connected to the body of the apparatus by means of the
flange and arms a¹ (see Figures 1 and 2). 6 is the cylindrical mixing tube in
which the propelling jet of fluid is combined with the fluid to be moved. The
tube b extends from near to the outlet of the nozzle a far enough to be completely
filled by the expanding jet. The length of the mixing tube shown is of about
4 to 5 calibres. This proportion is one from the use of which efficient results
may be obtained. The mouth, or inlet of the tube b is of trumpet shape as at c.
d is the diverging tube which extends from the end of the mixing tube 6 and in
which the velocity of the fluid from the tube b is gradually reduced.
In Figure 3 the apparatus according to this Invention is shown provided with a
casing or chest e forming its inlet and to connect by means of the flange f with the
ducts, conduits, or chambers containing the fluid to be moved. g is a screwed spindle
having a hand wheel g¹ and is used for the purpose of regulating the area of the
opening of the nozzle a. The cylindrical mixing tube 6 the enlarged inlet c and
the diverging outlet tube d are similar to those shown in Figure 1.
The regulating spindle valve g may be applied without the casing e to the form
of apparatus shown in Figure 1, also the apparatus shown at Figure 3 may be used
with, or without the regulating spindle valve g. The casing, or chest e shown at
Figure 3 may have its inlet in line with the axis of the apparatus, or at any other
angle with the axis, instead of at right angles as shown.
This Invention is not confined to the precise arrangements and details shown in
the Drawings as these admit of variations within the scope of the Invention.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what
I claim is
First In jet apparatus of the type herein described the use of a mixing tube
constructed substantially as set forth.
Second In jet apparatus of the type herein described the combination of a coned
inlet, a cylindrical mixing tube and a diverging outlet substantially as set forth
with reference to the Drawings.
Third The jet apparatus constructed substantially as set forth with reference to
Figures 1 and of the Drawings.
Fourth The jet apparatus constructed substantially as set forth with reference 4
to Figures 3 and 4 of the Drawings.