Improvements in or relating to Ventilating Fans and the like.
Year: 1899

page_text: Date of Application, 4th July, 1899-Accepted, 16th Sept., 1899
Improvements in or relating to Ventilating Fans and the like.
A communication from JOSEPH LECHIEN and BONAVENTURE BASTIN, of Jumet,
in Belgium, Engineers.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of London,
Chartered 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 and by the following statement:-
'
The present invention relates to ventilating and like apparatus, and especially.
to double ventilators and particularly ventilators of the kind employed in mines,
and has for its object to increase the quantity of air sucked in for the samo
amount of motive force applied, in other words to increase the yield or efficiency
of the apparatus.
The unsatisfactory yield of ordinary ventilators as used at present, is due
almost exclusively by disturbances and agitations in the current of air, produced
in the interior of the apparatus or at the inlet orifice, the first being to a great
extent the consequence of the latter..
The device which is the object of the present invention is intended to reduce
the friction of and to almost completely suppress the outside disturbances and
agitations whereby a better efficiency of the apparatus is obtained.
This, result is obtained by arranging between the two connected ventilators a
large fixed guide, deflector or double cone, made by two cones united at their
bases, and arranged so as to divide the air drawn in and to direct the current
towards the inlet orifices of the ventilators.
In the accompanying drawings one construction is shown by way of example,
of such a device applied to a double ventilator worked by hand.
Figure 1 represents an elevation of the ventilator.
igure 2 is a plan of the same apparatus.
Figure 3 is a transverse section on the lines A-B of Figure 1.
Figure 4 is a longitudinal section on the lines A-B of Figure 3.
P
The ventilator may be of any kind of construction and worked either by
minual or motor power. The one represented in the drawings consists of a
partly cylindrical casing, made of iron or steel and divided into three compart-
ments p and q which are indicated in Figures 2 and 3. In each of the outer
compartments P. the shaft a, revolving in bearings c, is provided with, say, four
fixed fans or blades indicated by m in the drawing (Figure 3). The middle
compartment contains the guide or deflector 7, composed of two cones, united
at their bases and secured concentrically to the shaft a by stays or plates g,
which are riveted to the sides of the compartment q.
The guide or deflector is so arranged that the apices of the cones are opposite
the centres of the lateral openings.o through which the air enters the ventilator.
The shaft a is also provided at one extremity outside the casing, with a smal!
pulleys (Figures 1 and 2) which receives a rotary movement from a belt and

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another pulley d keyed on a shaft and actuated by a crank i, in case the working
of the apparatus is carried out by hand. If the ventilator is worked by a
motor or by other transmission, a suitable pulley is fixed on the actuating
shaft.
The ventilator revolves in the direction indicated by the arrow in Figure 4
and the air or the gas enters the ventilator by way of the two tubes and
is driven out through the tubes kk, which are united by a Y-shaped piece thus
constituting a single outlet j.
'
It will be easily understood from the above that the air drawn in by the
apparatus meels, on arriving in the conipartment q the deflector or
and is thereby divided into two currents which pass to the lateral openings o of
guide, 1,
the two ventilators. The result of this arrangement is that the latter work as
if they were entirely independent and separate and the disturbances resulting
from the réciprocal effects of the ventilators produced on each other, are thus
avoided: morcover by the arrangement of two currents directed towards the
respective orifices o, friction is reduced to a minimum and the air enters with
much more facility and in greater quantities into the interior of the ventilators.
It will be easily understood that the guide may also be applied to ventilators
working by compression in the same manner as in those working by suction.
These ventilators. may be used for gases of different densities, the lighter gas
being drawn in through the upper tube while the heavier gas passes through the
lower tube, the gases being thus passed into the ventilator separately-guided
therein by the central double cone.
Having now particularly described and ascertained the nature of this said
invention, as communicated to me by my foreign correspondents, and in what
manner the same is to be performed, I declare that what I claim is:-
1. A ventilating or like apparatus comprising a casing divided into three
compartments the outer compartments being provided with paddles or blades
carried on a central rotatable shaft and the inner compartment having a double
cone guide or dollector,, and inlet and outlet openings in the casing, substantially
as described.
2. A double ventilating or like apparatus for acting upon gases of different
densities, comprising two inlet tubes arranged one above the other, the upper
tube receiving the lighter gases and the lower tube receiving the heavier gases
said gases being separately introduced into the ventilator by means of a double
cone guide or deflector arranged centrally in the casing around the motor shaft
and afterwards being simultaneously driven out through outlet tubes, substantially
as described.
3. A ventilating or like apparatus of the kind described, in which for operating
upon more than two kinds of gases a corresponding number of inlet tubes
arranged one above the other, substantially as described!
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4. The complete ventilating or like apparatus substantially as described or
illustrated in the accompanying drawings.
Dated this 4th dox of Tul. 1900.