Improvements in or relating to Enclosed Motors or Dynamos.
Year: 1899

page_text: Date of Application, 27th June, 1899
FL
07th Mar 1900-Accepted, 5th May, 1900
Date of Application, 27th June, 1899
Complete Specification Left,
07th Mar 1900-Accepted, 5th May, 1900
PROVISIONAL SPECIFICATION.
Improvements in or relating to Enclosed Motors or Dynamos.
We, PERCY ROSLING and HARRY WALTON APPLEBY, of Trafalgar Works,
Trafalgar Street, in the City of Bradford, Electrical Engineers, do hereby declare
he nature of this invention to be as follows:-
This invention relates to certain improvements in enclosed motors or dynamos
as set out in the Specification of Letters l'atent granted to us numbered 468
and dated the 7th day of January 1898, wherein we shew how a continuous
current of cold air may be drawn into the interior of dynamo and like casings
through suitable openings, and after passing through the enclosure within
the casing, escapes through openings at the opposite end
This invention has for its object the arrangement of the outlet opening or
openings in such a manner that, so long as the dynamo or motor is running, and
cold air is being passed through, the said apertures will remain open, but upon
stopping the dynamo or motor, such apertures or openings will be automatically
closed, and thus prevent air getting into the dynamo, which would have a
detrimental effect upon the working parts, as is the case when dynamos or
motors are working in chemical or like works.
We accomplish our object by providing the outlet opening or openings with
suitable back pressure or like valves attached to the casing or cover in any con-
venient position, and in such a manner that, upon the dynamo or motor coming
to a stand, the valve or valves will automatically fall to their seat or seats, thus
preventing any air passing into the dynamo or the like in that direction.
To further insure the prevention of air detrimental to the motor or dynámo
getting through the outlet openings, we may connect such opening or openings
and valves direct to a suitable atmosphere by means of one or more pipes
arranged in any convenient manner, or if desired the outlet opening or openings
may be connected to a suitable atmosphere by means of a pipe or pipes and the
automatic closing valve or valves dispensed with.
In order to draw air into the enclosed motor or dynamo, more particularly
where a long inlet pipe is used, and force it out of the pipe or pipes which may
be provided with or without valves, by means of a fan running within the
is necessary to produce a partial vacuum and also an excess of
dynamo case,
pressure. This may be accomplished by a fan as described in our specification
herein before cited, in connection with the, improvements herein set forth. In
order to intensify the effect of the fan and prevent the air from where the pres-
35 sure has been raised leaking back to the partial vacuum, and further to prevent
the partial vacuum from having a tendency to draw the oil out of the bearings.
when the fan is in close proximity thereto, we provide a chamber into which
air may be admitted through a pipe or other suitable inlet.
Part of the chamber is formed by means of a cover, which may be attached to
40 or form part of the frame of the motor, which is stationary, and the remaining
portion formed by means of a fan, the joints between the fan and the stationar
constructed that, though not in close contact, they offer so muc

page_text: resistance to the passage of air that, the difference in pressure on the two sides
of the joints due to the action of the fan, causes little or no air to pass through
the said joints, whereby leakage of air and the extraction of oil from the bear-
ings is prevented.
The inlet opening may be connected to the atmosphere surrounding the
motors, or to the atmosphere outside the building, or any other suitable atmos-
phere, by means of a suitable pipe into which may be introduced in any con-
venient position, a suitable filtering agency for preventing deleterious matter
from being admitted into the dynamo or motor.
In addition, the improvements here described secure a greater efficiency in
consequence of a much higher percentage of displaced air being usefully em-
ployed.
It is clear that without departing from the spirit of our invention, we may.com-
bine all or any of the improvements herein mentioned to suit each particular case.
Thus for instance, we may in the case of a machine possessing one bearing only
(as is often the case when dynamos or motors are coupled to other machinery)
mount the fan on the shaft in such a manner that its inlet is in direct com-
munication with the surrounding atmosphere, and allow the sides of the fan to
form part of the enclosing of the machine on that side, and provide a joint as
described, between fan and stationary machine casing.
Dated this 26th day of June 1890
JOHN WAUGH,
Agent, Sunbridge Chambers, Bradford.
Improvements in or relating to Enclosed Motors or Dynamos.
We, PERCY ROSLING and HARRY WALTON APPLEBY, of Trafalgar Works,
Trafalgar Street, in the City of Bradford, Electrical Engineers, do hereby declare
the nature of this invention and in what manner the same is to be performed to
he particularly described and ascertained in and by the following statement:-
This invention relates to certain improvements in enclosed motors or dynamos
as set out in the Specification of Letters Patent granted to us numbered 468
and dated the 7th day of January 1898, wherein we shew how a continuous
current of cold air may be drawn into the interior of dynamo and like casings
through suitable openings and after passing through the enclosure within
the casing, escapes through openings at the opposite end
This invention has for its object the arrangement of the outlet opening or
openings in such a manner that, so long as the motor or dynamo is running, and
cold air is being passed through, the said apertures will remain open, but upon
stopping the motor or dynamo, such apertures or openings will be automatically
closed, and thus prevent air getting into the motor or dynamo, which would
have a detrimental effect upon the working parts, as is the case when motors or
dynamos are working in chemical or like works.
We accomplish our object by providing the outlet opening or openings with
suitable back pressure or like valves attached to the casing or cover in any con-
venient position, and in such a manner that, upou the motor or dynamo coming
to a stand, the valve or valves will automatically fall to their seat or seats, thus
preventing any air passing into the motor or dynamo in that direction.
To further insure the prevention of air detrimental to the motor or dynamo
getting through the outlet openings, we may connect such opening or openings
and valves direct to a suitable atmosphere by means of one or more pipes

page_text: 0
45
'
anged in any convenient manner, or if desired the outlet opening or
ay be connected to a suitable atmosphere by means of a pipe or pipes and the
tomatic closing valve or valves dispensed with.
essure.
In order to draw air into the enclosed motor or dynamo, more particularly
here a long inlet pipe is used, and force it out of the pipe or pipes which may he
ovided with or without valves, by means of a fan running within the motor or
ynamo case, it is necessary to produce a partial vacuum and also an excess of
This may be accomplished by a fan such as described in our specification
ereinbefore cited, in connection with the improvements herein set forth. In
rder to intensify the effect of the fan and prevent the air from where the pres-
ure has been raised leaking back to the partial vacuum, and further to prevent
he partial vacuum from having a tendency to draw the oil out of the bearings,
hen the fan is in close proximity thereto, we provide a chamber into which
air may be admitted through a pipe or other suitable inlet. Part of the
chamber is formed by means of a cover, which may be attached to or form part
of the frame of the motor or dynamo, which is stationary, and the remaining
portion formed by means of a fan, the joints between the fan and the stationary
part being so constructed that, though not in close contact, they offer so much
resistance to the passage of air that, the difference in pressure on the two sides
of the joints due to the action of the fan, causes little or no air to pass through
the said joints, whereby leakage of air and the extraction of oil from the bearings
is prevented.
The inlet opening may be connected to the atmosphere surrounding the
motors, or to the atmosphere outside the building, or any other suitable atmos-
phere, by means of a suitable pipe into which may be introduced in any con-
venient position, a suitable filtering agency for preventing deleterious matter
from being admitted into the dynamo or motor.
In addition, the improvements here described secure a greater efficiency in
consequence of a much higher percentage of displaced air being usefully em-
ployed.
It is clear that without departing from the spirit of our invention, we may com-
bine all or any of the improvements herein mentioned to suit each particular case.
Thus for instance, we may in the case of a machine possessing one bearing only
(as is often the case when motors or dynamos are coupled to other machinery)
mount the fan on the shaft in such a manner that its inlet is in direct com-
munication with the surrounding atmosphere, and allow the sides of the fan to
form part of the enclosing of the machine on that side, and provide a joint as
described, between fan and stationary machine casing.
In order that our invention may be fully understood, we will describe the
same in detail by making reference to the accompanying sheet of drawings
which illustrate one method of carrying out our improvements.
Fig. 1 represents the side elevation partly in section of such portions of
metallic casing of an enclosed motor or dynamo with our improvements added
thereto as are necessary to illustrate our invention.
Fig. 2 is an enlarged sectional detail showing a fan for drawing in and forcing
suitable air through the dynamo or like casing.
Fig. 3 is an enlarged sectional detail view of an outlet valve.
Fig. 4 is an end view of same looking in direction of arrow in Fig. 3, and,
Fig. 5 is a modification showing how the fan may be mounted when th
50 motor or dynamo shaft is coupled direct to a machine.
In the figures referred to G represents the inlet pipe attached to the juncti
forming part of end cover L of motor or dynamo through which air is admitte
to chamber J.
The chamber is formed on one side by cover L, bearing casing H',
55 the other side by division plate K, and fan F.
and
The bearing casing H¹ and division plate K are stationary whereas the fan

page_text: Between these are therefore provided joints of a character such as herein before
described; they are formed between F, and K, by concentric cylindrical
Hanges F, and K', attached respectively to F, and K, and working in, close
proximity to each other, offering a high resistance to the passage of air since
the path which the air must take is long and the cross area of this joint is as
small as possible. This point will therefore reduce to a minimum the amount
of air leaking from the interior A¹, of motor or dynamo where the pressure is
increased by the action of fan l', to the chamber J, where a partial vacuum is
formed by the action of said fan.
The joint between the bearing casing H¹, and fan I, is of the same character
as the joint before described. The conical end. He, of bearing casing H', is in
close proximity to the boss F2, of fan F, of like configuration, this joint prevents
the extraction of oil.
The air admitted through inlet pipe G, and raised to a higher pressure in
interior A¹, of motor or dynamo casing by action of fan F, escapes through
outlet 13, after raising valve C, mounted on pin C', and passes through outlet
pipe E.
The valve C, is so mounted that upon the motor or dynamo coming to a stand,
the said valve C, will fall to its normal position on seating 02, thus preventing
air from entering the interior A', of motor or dynamo in this direction.
When outlet pipe E, is utilized for connecting the interior A¹, of motor or
dynamo with a suitable atmosphere, the valve C, may obviously be dispensed
with.
In our modification illustrated by Fig. 5 wherein a motor or dynamo is illus-
trated as coupled direct to another machine and working in an atmosphere which
is not detrimental, it is not necessary to use an inlet chamber J; allowing the
fan F. to draw air direct from the surrounding atmosphere, and only increasing
its efficiency by preventing the raised pressure in the interior A', of motor or
dynamo from leaking back to the exterior on that side of casing, by the intro-
duction of the joints formed by flange F', of fan F, and flange K', of end
plate K, of the same character as hereinbefore described.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is―.
J. The use, in combination with motors and dynamos of the enclosed type and
provided with a fan or equivalent of an outlet valve or valves, so arranged that
when the motor or dynamo is running, this valve or valves open, closing upon
the motor or dynamo coming to a standstill, substantially as and for the purpose
herein before described.
2. The use in combination with motors and dynamos of the enclosed type and
provided with a fan or equivalent, of an outlet pipe or pipes connecting the
interior of the motor or dynamo with any suitable atmosphere, substantially
as and for the purpose hereinbefore described.
3. The use, in combination with motors and dynamos of the enclosed type and
provided with a fan or equivalent, of an outlet valve or valves together with an
outlet pipe or pipes, substantially as and for the purpose herein before described.
4. The use, in combination with motors and dynamos of the enclosed type and
provided with a fan or equivalent, of joints of small cross area and presenting a
long path to the air, substantially as and for the purpose herein before described.
5. The use, in combination with motors and dynamos of the enclosed type and
provided with a fan or equivalent, of an inlet chamber formed partly by the
fan and partly by stationary walls forming part of the motor or dynamo casing
or attached thereto, joints of small cross area and presenting a long path to the
air, being used between moving and stationary parts, substantially as and for the
purpose herein before described.
6. The combination and arrangement of parts constituting an enclosed and

page_text: ventilated motor or dynamo as illustrated in Fig. 1 of the accompanying un
ings.
7. The combination and arrangement of parts as illustrated in Fig. 5 of the
accompanying drawings.
JOHN WAUGH,
Agent, Sunbridge Chambers, Bradford.