IMPROVE- MENTS IN EJECTORS
Year: 1885

page_text: I, RICHARD MOUNTFORD DEELEY, Junior, Engineer, of No 1, Highland Villas,
Mill Hill Road, Derby, do hereby declare the nature of my invention for IMPROVE-
MENTS IN EJECTORS, to be as follows:-
My invention relates to an improved form of instrument whereby the action of
an enclosed steam jet produces a partial vacuum in a very rapid manner.
The particular class of ejector to which my invention refers is that in which a
jet of steam of annular section issues within a pipe from an annular nozzle the
bounding walls of which are inclined to each other so as to expand the steam to the
full bore of the ejector.
Hitherto the outside wall of the annular orifice has been continued as a con-
verging cone to the throat of the ejector in such a way as to cause the steam to
move parallel to or even away from its surface.
My invention consists in so constructing or inclining the walls of the annular
steam nozzle that the steam jet is caused, in part, to impinge at a small angle
against the internal surface of the converging cone of the ejector; and at the same
time to be expanded by the angle of the internal cone so as to fill the full bore of
the instrument.
The steam, by being. thus caused to strike the inner surface of the converging
cone, becomes denser from the centre towards the outside and enables a much
higher and quicker vacuum to be obtained than is otherwise possible.
I claim as my invention the arrangement whereby the steam jet is caused, in
part, to strike at a low angle against the inner surface of the converging cone of
the ejector, as previously described.

page_text: I RICHARD MOUNTFORD DEELEY, Junior, Engineer, of No 1, Highland Villas,
Mill Hill Road, Derby, do hereby declare the nature of my invention for
IMPROVEMENTS IN EJECTORS 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 form of instrument whereby the action of
an inclosed steam jet produces a partial vacuum in a very rapid manner.
The particular class of ejector to which my invention relates is that in which a
jet of steam issues within a pipe or barrel from an annular nozzle, the bounding
walls of which are inclined to each other so as to expand the steam to the full bore
of the instrument.
Fig. 1 is a longitudinal and Fig. 2 a cross section of one form of my improved
instrument. The fluid or liquid to be exhausted passes into the ejector by the
pipe a, past the valve V, and through the centre of the cone c. The steam or other
gas which is to supply the motive force used to create a suction, enters the branch
pipe & leading into the chamber 81, and, after passing through the narrow annular
opening n, between the cone o and the barrel b, it expands as it continues to pass
through the nozzle n¹. After entering the instrument through these two passages
the combined gases pass on together through the parallel part p and out through
the diverging cone d. What I claim as my invention is the curved form of the
barrel b and the improved form of steam nozzle thus obtained. That portion of
the barrel surrounding the cone c, and forming the outer wall of the nozzle n¹,
I prefer to make parallel as shewn in Fig. 1. The diameter of the barrel is then
reduced by a curve, or other means, until it equals that of the parallel portion p.
The steam or other gas is thus greatly expanded and caused in part to strike
against the converging internal surface of the barrel b. By this means a very
equable distribution of pressure in the ejector is obtained.
With ejectors made in accordance with this invention a vacuum equal to a
column of mercury ranging in height from 28 to 29 inches may be obtained with
very great rapidity and with a small consumption of steam.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that
what I claim is :-
The construction of ejectors having the curved barrel and improved form of
steam nozzle as hereinbefore described, but I do not restrict myself to any
particular proportions of the parts.