Improvements in Centrifugal Fans, and Means for Driving them..
Year: 1895

page_text: Date of Application, 22nd July, 1895-Accepted, 24th Aug., 1895.
COMPLETE SPECIFICATION.
Improvements in Centrifugal Fans, and Means for Driving them..
I, FRIEDRICH EISENBEIS, Manufacturer of Wellesweiler near Trier in the
Province of Rhineland and Kingdom of Prussia 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 :-
The subject of the present invention is a veutilator for mines, which is dis-
tinguished by great efficiency, and which, in consequence of its compact structure
can be erected everywhere.
Figure 1 represents the ventilator in a side-view, Fig. 2 in a section, in Fig. 3
the arrangement of the compressed-air cylinder is illustrated.
The improvement consists in the ventilator, 1.) being driven by a directly
coupled oscillating compressed air engine as well 2) by its no longer being provided
as was hitherto the case with a central aspirating-hole, but is supplied with two
centrally arranged suction pipes, of which one is secured at each side of the
ventilator casing.
In the figures A is the casing with the central openings for the admittance of
the suction air, B the discharging-pipe and C C, the two suction-pipes.
The axle a, which runs in the bearing boxes 6 b₁, passes through the middle of
the ventilator casing.
On this axle there are the wings c. They are divided by a partition d, corre-
sponding to the diameter of the casing, and standing at right-angles to the axle in
such a manner, that two adjoining chambers are each formed by two wings and the
piece of the partition lying between.
In this manner the fan wheel is divided into a group of chambers lying to the
right and to the left of the partition, each of which sucks up the air from the
suction-pipe C, or C₁, belonging to it, while the sucked in air is conducted further
by the common delivery-pipe or discharging pipe B.
In order to obtain a complete tightness between the casing of the ventilator and
the fan-wheel, i.e. in order to prevent the air from passing along the fans, two
angle-iron rings W W are arranged on both sides, which receive between them a
rolle of the casing.
As we have already mentioned, the ventilator is driven by an oscillating
compressed air engine, which is situated outside the casing.
The shaft which is bent at right angles at the end is driven round by the piston
rod f, which is actuated by the piston of the oscillating cylinder E (specially
illustrated in Fig. 3).
The compressed air is conducted to the cylinder from a compressed air reservoir
and escapes, after having used, through the tube f₁, into the delivery-pipe of the
ventilator.
1
It goes, without saying, that the delivery-pipe may be arranged above on the
ventilator instead of below and in case that steam is to be had the ventilator may
also be driven by an oscillating steam-engine.
Having now particularly described and ascertained the nature of my said inver-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:―
1. A ventilator for mines with directly coupled oscillating compressed air-

page_text: 2. The arrangement of the ventilator, distinguished by the suction pipes C C₁,
arranged centrally on both sides of the casing, the fan-wheel supplied with a
partition at right-angles to the axle and dividing the wings in half, as well as the
chuck-angle rings on both sides of the fan-wheel.
Dated this 6th day of July 1895.
For FRIEDRICH EISENBEIS,
Bernh. Brockhues.