Year: 1887

page_text: Date of Application, 16th Dec., 1887
Complete Specification Left, 26th July, 1888
Complete Specification Accepted, 14th Sept., 1888
I, WILHELM WENTZ, of 17 Gerhardstrasse, Berlin, in the Empire of Germany,
Foreman, do hereby declare the nature of this invention to be as follows:-
This invention relates to feed water injectors for steam boilers.
In carrying out the invention the steam-nozzle is constructed of two concentric
parts, the inner part serving to start the injector; one part is movable within or upon
the other in such a manner that the outer part of the nozzle is put out of action by
the steam entering the injector, so that a vacuum and consequent suction is effected; the
movable part of the nozzle, which may be the inner or outer part, can then be operated
in such a manner as to completely open the steam nozzle. The combining tube in
front of the steam nozzle can be fixed or arranged so that it can be moved towards the
steam nozzle.
In order to produce a more powerful suction the combining tube can be provided
with a number of holes situated between the water-inlet and the overflow, thereby
allowing the steam to escape rapidly into a space surrounding the combining tube.
Holes can also be provided in the bushing in which the discharging tube works for a
like purpose.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.

page_text: :
I, WILHELM WENTZ, of 17 Gerhardstrasse, Berlin, in the Empire of Germany,
Foreman, 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 :-
This invention relates to feed water injectors for steam boilers.
In carrying out the invention the steam-nozzle is constructed of two concentric
parts, the inner part serving to start the injector; one part is movable within or upon
the other in such a manner that the outer part of the nozzle is put out of action
by the steam entering the injector, so that a vacuum and consequent suction is effected ;
the movable part of the nozzle which may be the inner or outer part can then be
operated in such a manner as to completely open the steam nozzle. The combining.
tube in front of the steam nozzle can be fixed or arranged so that it can be moved
towards the steam nozzle.
In order to produce a more powerful suction, the combining tube can be provided
with a number of holes situated between the water-inlet and the overflow, thereby
allowing the steam to escape rapidly into a space surrounding the combining tube.
Holes can also be provided in the bushing in which the discharging tube works for a
like purpose.
In order to enable my invention to be fully understood, I will proceed to describe
how it can be carried into practice by reference to the accompanying drawing, in
which
Figures I and V, are sections of feed water injectors for steam boilers constructed
according to my invention.
Figure II is a section of part of an injector showing the hole in the combining
tube.
Figure III is an end elevation of the combining tube; and,
Figure IV is a transverse section of figure II.
Similar letters in all the figure indicate similar parts.
In figure I, the inner part a of the steam-nozzle is provided with openings which
allow the steam entering at A to pass into the annular chamber b formed by the outer
movable part d of the nozzle.
The part d of the nozzle is concentric with the part a and closes the chamber by
its conical surface y fitting over the part a. The steam, acting on the surface a of the
part d, effects the complete closing of the chamber even if the surface y of the part d,
when the latter commences to act, should not come close over the corresponding

page_text: surface of the part a. When the suction of the injector commences, the outer part d
of the nozzle moves towards the left-hand away from the inner or fixed part a, so that
the steam passes not only out of the fixed part a but also out of the part d through the
openings and the chamber b; the injector will then be in full action and will suck
or draw water through the pipe B. The outer part of the nozzle, as shown in the
drawing, can be connected to the combining tube f and be moved over the inner
part a of the nozzle by means of a hand-lever g fixed on a spindle h, provided with
an eccentrically placed pin connected with a slide 2 working in a groove f in the
combining tube, as shown in figure IV. The tube can however be fixed and only
the nozzle d be made movable by means of suitable mechanism for this purpose.
In order to provide an injector having a double suction and to produce a quicker
and longer suction, the combining tube can, as shown in figures II and III, be provided
with a number of holes f3 which will allow of a rapid escape of the steam into the
chamber K surrounding the combining tube.
By further turning the pin ', the portion of water drawn in, which flows over into
the chamberk is carried away by the overflow together with the stream of water
forced into the discharge tube.
To allow the water to flow more quickly from the chamber into the feeding channel,
the guide tube i of the combining tube can be provided with openings ; these
openings however may be dispensed with.
In the modification illustrated in figure V, the outer part of the nozzle of the
injector is fixed and the inner part a is movable and slides in the upper part or head K
of a spindle k. The sliding part of a is provided with an annular recess s and pins »
are fixed in the head K which limit the movement of the part a; the head K can
be brought to close the opening in the part d of the nozzle in a similar manner to
a spindle valve.
When the injector is required to be put out of action the head K of the spindle k
is brought close against the part d of the nozzle by turning the hand wheel in the
right direction. To put the injector in operation the spindle must be lowered by
turning the hand-wheel in the opposite direction; steam entering at A will then
pass over the surface of the head K and will press upon the surface a of the
movable part a of the nozzle. The surface y will thereby be caused to sit close upon
the inner surface of the fixed part of the nozzle. The steam will for the moment
pass through the passage o in the part a and the suction of the water through the
pipe B will be produced; the suction having been established, the spindle k must be
further lowered when the pins will come against the lower end of the annular
recess and draw down the part a of the nozzle so as to remove its surface y from
the inner surface of the part d when the steam will pass through the space between
the two parts a and d of the nozzle.
This arrangement is especially suitable for vertically fixed injectors; it can how-
ever be employed for horizontal injectors. Both the arrangements herein before
described can be applied with very few alterations to non-suction injectors, so as to
convert them into suction injectors.
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:-
--
1. In feed water injectors for steam boilers, a steam-nozzle consisting of two
concentric parts, the inner part of which is fixed, has its outer surface of conical shape,
and is provided with openings, the outer part being movable within the first or inner
part in an axial direction and formed with a conical surface adapted to fit over the
inner part and with a steam pressure surface a chamber or space being provided
between the two said parts into which chamber, when the injector commences to act,
steam enters through the said openings, for the purpose specified.
2. The arrangement of holes in the combining tube for the purpose of effecting a
rapid suction by allowing steam to pass into the chamber surrounding the said tube

page_text: and the arrangement of holes in the guide tube thereof for the purpose of accelerating
the entry of the water into the feeding channel.
3. The modified construction of steam-nozzle in which the inner part is movable, is
of conical shape on its outer surface and is provided with a steam pressure surface and
a passage, the outer part being fixed and provided with an inner conical surface so
that, when starting the injector, the steam enters the chamber formed by the two
parts of the nozzle, for the purpose described.