Improvements in Ventilators for Mines and other Situations.
Year: 1892

page_text: Date of Application, 21st Jan., 1892
Complete Specification Left, 1st June, 1892-Accepted, 16th July 1892
PROVISIONAL SPECIFICATION.
Improvements in Ventilators for Mines and other Situations.
1, THOMAS MARSDEN of Alliance Colliery, Wigan, Manager, do hereby declare-
the nature of my said invention to be as follows:-
This invention relates to an improved construction of rotary ventilator for
ventilating mines and other like situations which consists of a drum or casing.
mounted on radial arms on a revolving shaft.
Outside this drum is a larger drum
arranged concentrically and provided with a number of hollow arms (eight by
preference) branching radially outwards from its periphery and which arms are.
closed at their outer extremities but provided with openings in their sides opposite.
to those facing the direction of rotation of the drum. Each of these arms is divided
by a longitudinal mid feather into two distinct passages one of which passages.
communicates with the interior of the larger drum whilst the other passages extend
inwards and terminate in the smaller drum. The drums are in communication with
the interior of the mine by means of an extension tube or pipe at one end and at
the other end are closed by a suitable plate.
It will be seen that when the drums with the radial arm are caused to revolve-
the foul air will be drawn into the interior of the said drums and caused to issue-
along the passages in the radial arms and through the openings or orifices.
aforesaid.
In practice I prefer to divide the space between the inner and outer casings or
drums into radial chambers providing one chamber to each outward passage of the
radial arms.
I also prefer to enlarge the outer extremities of the said arms to.
admit of a freer exit of foul air.
Dated this 20th day of January 1892.
JOHN G. WILSON,
Agent for the Applicant..
COMPLETE SPECIFICATION.
Improvements in Ventilators for Mines and other Situations.
I, THOMAS MARSDEN of Alliance Colliery, Wigan in the County of Lancaster,
Manager, 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 the construction of rotary fans or ventilators for
ventilating mines and other like situations, and particularly to the shaping of the
blades whereby the air, after being guided inwards from the side, is more effectively
propelled radially outwards by centrifugal force, and the volume of air delivered,
thereby materially increased.
The invention will be understood from the following description, reference being.
had to the accompanying drawings, in which :-
Figure 1 is a front elevation of a double fan or ventilator;
Figure 2 a transverse section on the line a¹¹ (Figure 1);
Figure 3 a front elevation, partly in section, of a single fau;
Figure 4 a transverse section on line y; and
Figure 5 a transverse section of another form of double ventilator in which the.
air is drawn in on both sides of the fan.
The construction which I originally designed is shown in Figures 1 and 2, and
consists of a drum or casing I mounted on radial arms, ou a revolving shaft C
De

page_text: Outside this drum I is a larger drum A, arranged concentrically, and a number of
hollow blades or arms E E are provided, branching radially outwards, which serve
as channels along which the air travels towards the circumference when the fan is
in operation. These arms may, if desired, be closed at their outer extremities, but
provided with openings in their sides, but it is generally found more convenient to
provide the openings at their extreme ends as shown. Each of these arms E El is
divided by a longitudinal mid feather J into two distinct passages, one of which
passages, E', communicates with the interior of the larger drum A, whilst the other
passages E extend inwards and terminate in the smaller drum I. F F¹ are the side
plates of the fan, and G the flange at one side for receiving the end of the ventilating
pipe by which the fan is in communication with the interior of the mine, the other
side being closed by the plate F.
In practice, I prefer to divide the interior of the inner and outer casings or
drums A, I, into radial chambers H, providing one chamber to each outward
passage of the radial arms E, E, also to provide an outer concentric drum D.
The outer extremities of the arms may be enlarged to admit of a freer exit of foul
air, but this is not generally advisable.
The mode of action is as follows :-
When the fan is caused to revolve in the direction of the arrow, the air is drawn
axially into the radial chambers H, and, as the plate F closes the opposite side of
the drums, the air is deflected in a radial direction through the hollow blades or
arms E, E, and caused to issue through the openings at the ends thereof.
The apparatus depicted in Figures 3 and 4 is a single fan, and is constructed on
the same principle as that above described, but, in this case, I have omitted the
radial chambers, and the inner drum I, being not required, is also eliminated, the
drums A, F, only being used. The fan is mounted on radial arms B on the shaft C.
The hollow blades E radiate from the inner drum A, and, when the air is drawn
by the revolution of the fau, axially into the interior of the drum A, it is delivered
therefrom by centrifugal force along the passages in the said radial blades.
The general arrangement of the fan, when employed for drawing air in on both
sides, is almost identical with the examples above described, but, with this exception,
that a mid division or plate J (Figure 5) is, in such case, placed down the middle,
or two fans may even be located back to back, whereby the air drawn in on each
side of this fan and impinging against this division is deflected radially outwards.
The hollow blades or arms E may be fastened by cross pins K passing through
and rivetted or bolted to the side plates F For, where great strength is required,
they may be attached by angle irons, and even strengthened by struts or otherwise.
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. Constructing the blades of a ventilating fan hollow, whereby a passage or
channel is formed along which the air travels to the circumference, substantially as
described.
2. In combination with hollow radial blades of a ventilating fan, a central drum,
the interior of which is divided into radial chambers, communicating with the
outward passages of the said blades, substantially as described.
3. The general combined arrangement and construction of parts forming the
improved rotary ventilator, substantially as set forth.
Dated this 31st day of May 1802
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.