Improvements in Injectors.
Year: 1895

page_text: Date of Application, 22nd Apr., 1895-Accepted, 1st June, 1895
Magdeburg, in the German Empire, Engineers.]
Improvements in Injectors.
I, WILLIAM EDWIN HEYS of 70 Market Street Manchester in the County
of Lancaster, Patent Agent, 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 aud by the following statement :-
This invention relates to injectors which may be used for ordinary purposes, but
which are especially constructed and adapted to feed hot or warm water.
These improvements are illustrated by the accompanying drawings, to which
reference is hereinafter made, and in which :-
Figure 1 represents a longitudinal section, and
Figure 2 a cross section.
It will be understood that the casing of. the injector may be made in any usual
or in any convenient or desired form, and is not limited in construction to the type
illustrated.
An injector constructed according to this invention contains the essential parts
used in all injectors, that is to say, a steam nozzle, a combining nozzle and a
delivery nozzle, but their construction and operation are different, and produce
better results in practice.
The combining nozzle has its largest diameter at a, where steam enters the
nozzle from the steam nozzle d the water entering through the inlet e, in the
direction shewn by the arrow. From the point a the nozzle is coned down until it
attains its minimum diameter at e, from which point the interior of the nozzle is
cylindrical for a short distance, as indicated, and from the cylindrical part to the
end of the nozzle, is again coned, widening out to the end b. That part of the
nozzle from a to c constitutes the combining nozzle, the part c, the delivery.
cylinder, and the part cb the delivery nozzle. The feed space is shewn at f
between the nozzles and the back pressure valve, and the overflow at g. The
arrangement so far is substantially the same as that employed in existing
injectors.
According to this invention the combining nozzle is transversely divided at i,
and that part of it from ito e is formed in one piece with the delivery cylinder and
delivery nozzle without an opening in their length beyond the openings n the
function of which is hereinafter described. The combined nozzles from i to b are
arranged to slide longitudinally in the sleeve or bearing fixed between the
delivery space f and the overflow g. The part of the nozzle which slides in his
provided with webs k shewn also in the cross section Figure 2, between which
there are passages establishing a connection between the feed space and the
overflow. At the point i of the sliding part of the nozzles, there is formed an
annular groove m the inner wall of which is pierced at n.
When steam is admitted to the injector, through the nozzle d, and before water
enters at e, the pressure of the steam forces the sliding parts i to 6 of the nozzles
forward, and the entering steam is thus enabled to escape through the annular
opening produced at i and thence through the overflow. Owing to the free escape
of steam, the water is quickly drawn up through e and enters the combining nozzle
A vacuum is thus producel in the nozzle, and the sliding part is thereby
at a.

page_text: drawn back and the feed starts into the delivery space f. From this time, and as
long as the injector continues at work, the combination of nozzles is closed at i
against the overflow, and consequently no air can be drawn into the injector. The
sliding part is firmly held in this closed position owing to the suction at i and to
the positive pressure at against the end of the nozzle, and this positive closing is
essential, if the injector is to feed hot water. When the sliding part of the nozzle
moves forward any, excess of pressure in the feed space is relieved through the
passages between the webs k, already described, but, when the nozzles are closed,
a flanged part on the end 6 comes against the sleeve h and closes these passages,
cutting off communication with the overflow. In this position. the nozzles are
completely closed throughout their length.
1
In the event of any interruption in the water supply, steam again enters the
combining nozzle, and its pressure again forces forward the sliding part as at
starting, so that at every failure of the water supply from any cause whatever, the
injector is automatically re-started.
The construction of the annular groove at m ensures the rapid forward movement.
of the sliding part under all circumstances owing to the corresponding large surface
exposed to steam pressure through the openings n.
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 injector, a transversely divided combining nozzle, the steam end of
which is fixed, and the delivery end of which is connected rigidly with a delivery
cylinder and a delivery nozzle and is capable of sliding through a limited distance
in the direction of the axis of the nozzles, constructed arranged and operating
substantially as and for the purpose hereinbefore described and as illustrated by
the accompanying drawings.
2. In an injector, a sliding delivery nozzle rigidly connected with the delivery
end of a transversely divided combining nozzle, constructed arranged and operated
substantially as and for the purpose herein before described and as illustrated by
the accompanying drawings.
Dated this 20th day of April A.D. 1895.