Improvements in Means or Apparatus for Drawing or Forcing Aeriform Fluids for Ventilating or other Purposes.
Year: 1889

page_text: Date of Application, 27th Apr., 1889
Complete Specification Left, 27th Jan., 1890--Accepted, 1st Mar., 1890
PROVISIONAL SPECIFICATION.
Improvements in Means or Apparatus for Drawing or Forcing
Aeriform Fluids for Ventilating or other Purposes.
We BENJAMIN VERITY of 137 Regent Street and JOHN BENJAMIN VERITY of
Electrical
31 & 32 King Street, Covent Garden, both in the County of Middlesex,
Engineers, do hereby declare the nature of this invention to be as follows
The apparatus embodies an air propellor having an axis provided with radial blades
projecting from it, the blades being enclosed in a circular casing which is attached
to and revolves. with them.
When the axis is revolved air is drawn in at the under side and is driven outwards
by the radial blades.
The blades of the propellor are radial so as to avoid disadvantages. Hitherto it
has been found that in fans running at high speeds an objectionable humming or
disagreeable noise is caused owing to the concussion of the fan blades with the
atmosphere, and also that this concussion tends to reduce or retard the effective
output of the fan, as well as absorb a large amount of motive power without any
appreciable gain or increase in draught.
The blades are substantially of a screw form similar to that of a ship propellor so
that when revolving the air is screwed forward and not forced by sudden concussion,
consequently no slamming takes place, the action of the blades in the atmosphere
being gradual and not sudden, in fact starting from nil and attaining their maximum
propelling power after moving about two-thirds the distance of width of blade. The
inain object of the surrounding case revolving with blades is to prevent any escape
of air from the ends of same, and to force all the air in one direction, it also forms
mechanical fixing for the blades, making the whole propellor rigid and compact.
It has been found that a propellor of this form will move air at a velocity equal
to that of blast fans, hitherto used, with considerably less motive power, and without
noise which supplies a want where, as for public buildings such as churches, theatres &c.,
absolutely noiseless ventilation is a desideratum.
The bearings for the screw blades and cylinder are formed preferably as coned or
blunt pointed ends rotating in cup bearings within guides and supplied with lubricant ;
the wearing parts being formed preferably of phosphor, the parts most liable to wear
being removeable and renewable."
ليوم
1 CA: 1000
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Means or Apparatus for Drawing or Forcing
Aeriform Fluids for Ventilating or other Purposes.
We BENJAMIN VERITY of 137 Regent Street, and JOHN BENJAMIN VERITY of
31 & 32 King Street, Covent Garden, both in the County of Middlesex, Electrical
Engineers 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 manufacture of a simple, effective and durable means
for drawing or forcing aeriform fluids from or into chambers, or places, in order to
effect the ventilation thereof, or for other purposes.

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is a section of one form of the apparatus.
Figure 2 is a side view thereof.
Figure 3 shews by a vertical section a modification of the apparatus especially
designed for employment when the fan is required to rotate in a horizontal position.
a is the axis, carried in bearings 61 b' in a framing b. b. This framing being in two
parts holted together, and being provided at 62 with lugs and holes for securing the
whole in position. The axis a has mounted on it the driving pulley a', and also
carries the cone shaped part to which the inner ends of the blade c are rivetted, the
outer ends of these blades being secured to the cylinder c' by rivets at c³.
When the axis a is revolved, air is drawn in at the inlet side of the division or wall
of the chamber or place where it is applied, and is driven to the outlet side by the
radial blades c.
The blades c of the propellor are radial so as to avoid disadvantages.
Hitherto it has been found that in fans running at high speeds an objectionable
humming or disagreeable noise is caused owing to the concussion of the fan blades
with the atmosphere, and also that this concussion tends to reduce or retard the
effective-output of air of the fan, as well as absorb a large amount of motive power
without any appreciable gain or increase in draught.
The blades are substantially of a screw form similar to that of a ship propellor, so
that when revolving the air is screwed forward and not forced by sudden concussion,
consequently no slamming takes place, the action of the blades in the atmosphere being
gradual and not sudden, in fact starting from nil and attaining their maximum pro-
pelling power after moving about two-thirds the distance of width of blade. The
main object of the provision of the surrounding case c¹, arranged to be capable of
revolving with the blades c, is to prevent any escape of air from the ends of same, and
especially to prevent air from being drawn into the fan area in directions from the
periphery to the centre, that is to say from the inner face towards the outer face,
it also forms a mechanical fixing for the blades, making the whole propellor rigid
and compact.
It has been found that a propellor of this form will move air at a velocity equal
to that of blast fans, hitherto used, with considerably less motive power, and without
noise, which supplies a want which has been felt where, as for public buildings
as churches, theatres and other places absolutely noiseless ventilation is a
desideratum.
The bearings b¹ for the screw blades c, and cylinder c', are formed preferably as
coned or blunt pointed ends rotating in cup bearings within guides and supplied
with lubricant; the wearing parts being formed preferably of phosphor bronze, the
parts most liable to wear being removeable and renewable.
In the arrangement shewn by Figure 3 the blades of the fan within the surrounding
enclosing cylinder c' are omitted for the simplification of the drawing but they are
in practice made the same fashion as in figures 1 and 2. The axis a is fixed and
does not revolve heing borne by the cross arms a³, here shewn as three in number
one being removed from the annular frame a surrounding the opening A through
which ventilation is being effected.
Upon this axis the revolving fan is wholly borne together with the driving
pulley a formed in one with the fan.
The end a² of the axis a is cupped so as to receive in it the projection c* from
the underside of the part c' and the fan also bas two bearings c, c' which surround
and take their bearing on the axis a, and by these means the whole of the weight
of the fan and driving wheel is borne slung on the cupped end a² of the axis a

page_text: whilst the lateral regulation is effected by the bearings c and c'. e8 is an oil cup
communicating with an oil chamber by passages co the oil also passing down
the spindle to and lubricating the bearings and c³.
Having now particularly described and ascertained the nature of our said invention,
and in what manner the same is to be performed, we declare that what we claim
is:-
1. In a fan for drawing or forcing aeriform fluid for ventilating or other purposes,
blades, as c, of screw form substantially as shewn arranged radially around a
central axis within and affixed to a surrounding case, as c², so as to prevent air
from being drawn into the fan area in directions from the periphery to the centre
of the fan and also to form a rigid fixing for the fan blades, all substantially as
set forth.
2. The combination or arrangement and use of parts of a fan as already described
in respect of Figures 1 and 2 with the parts for suspending and supporting the
same during revolution, substantially as set forth in respect of Figure 3.
3. The general construction and arrangement of the parts of rotatory fan apparatus
for drawing or forcing aeriform fluids for ventilating or other purposes, substantially
as and for the purposes hereinbefore set forth.
0711
T
1000
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicants.