Improvements in or relating to Screw Pumps, Motors, and like Apparatus.
Year: 1898

page_text: Date of Application, 25th Apr.,
1898
Complete Specification Left. 25th Jan. 1899-Accepted. 18th Mar. 1899
Improvements in or relating to Screw Pumps, Motors, and like
Apparatus.
We, LOUIS GEORGES BENOIT and ANGELIN JOSEPH MARIUS JULIEN, of 119, Rue
St. Maur, Paris, in the Republic of France, Engineers, do hereby declare the nature
of this invention to be as follows:-
This invention relates to a pump, motor, injecting or like apparatus and is
particularly adapted for use in cooling the motors of motor vehicles, but it is also
adapted for other purposes. This pump has instead of a piston, one or two screws
or blades which by their rotation draw in water or fluid and discharge it at the
point desired.
In case of two screws being used in the apparatus they are mounted or formed
on the same spindle which may be driven from the motor of a motor vehicle or in
any other way according to circumstances. The screws are of the same pitch but
cut in opposite directions and rotate in a cylindrical pump body or cylinder. The
body of the pump is closed at both ends, preferably, by discs each provided with a
socket or stuffing box in which the screw spindle can rotate.
A diaphragm or annular disc may be arranged between the two screws in order
to destroy the effect of contrary currents in the interior of the pump.
The apparatus can be used as a hydraulic motor, as an air pump, ventilator or
the like.
BOULT & WADE,
Agents for the Applicants.
Improvements in or relating to Screw Pumps, Motors, and like
Apparatus.
We, LOUIS GEORGES BENOIT and ANGELIN JOSEPH MARIUS JULIEN, of 119, Rue
St. Maur, Paris, in the Republic of France, 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 a pump motor or like apparatus and is particularly
adapted for use in circulating water for the purpose of cooling motors of motor-

page_text: vehicles; but which may also be applied for other uses. The pump has instead of a
piston one or two screws or blades which by their rotation draw in water or fluid
and discharge it at the place required.
In the accompanying drawings,
Fig 1 is a longitudinal section of a pump according to this invention.
Fig. 2 is a cross section on the line 2-2 of Fig. 1 and
Fig. 3 is a plan view of Fig. 1.
C
The apparatus represented in the drawing is a pump with two screws a a¹
mounted or formed on the same shaft which, is worked from the motor of the
car, or by any other means as may be required or convenient, the two screws,
which resemble an ordinary screw are of the same pitch but in a contrary direction
and are separated from each other by a diaphragm or partition c opposite which is
the outlet d, while admission is through a single suction tube dividing into two
passages e el separate from each other, and entering the screw chamber beyond the
screws. The inlet and outlet passages are cast in one with the cylinder, or body f
of the pump within which the screws revolve, the ends of the casing being closed
by the plates gg which are screwed by means of screws or bolts. These plates are
cast in one piece each with a central socket to receive the shaft b which revolves
in them with slight friction; which sockets may be replaced, if desired,
by two stuffing boxes. The body of the pump is also provided with a
flange h, cast with it in one piece by which means the pump is fixed in the desired
position.
Plates or projections ii are radially arranged on the body of the pump, in such a
manner that they fit between the ends of the screws a a¹ and the central wall c.
Working. When the shaft 6 revolves in the required direction the screws a a¹
suck the fluid in through the passages e e¹ and drive it out through the outlet d
whence it is conducted by a pipe for the purpose of cooling the motor or to any
place where it may be required after which it may be re-admitted into the admission
passages ee to be used again, say, after having been cooled by passing through
cooling tubes which may form the frame of the box of the vehicle.
The diaphragm c is not absolutely necessary but its presence will cause an
increased supply of water; without it, the shock of the two contrary streams,
as they are driven towards the common outlet is so great that they impede the
egress sufficiently to produce a marked loss in the discharge.
The two pallets i¹ are provided to stop the circular movement of the stream
and to force it to enter the outlet d.
Instead of a double screw the pump may be provided with a single screw. In
this case only a single admission or suction passage is required.
We may also substitute for the screw, having a continuous thread, a screw with
several branches or blades like those used in propeller vessels.
Our pump may also be used as a hydraulic motor by making the tube d the
inlet opening and the passages e e¹ the outlet, or it may also be used as a gas pump
or as a ventilator.
When the pump is used as a water pump a valve may be introduced if desired
into the suction tube and another into the delivery tube.
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. A pump motor or like apparatus comprising a casing provided with inlet and
outlet passages and a central shaft carrying two screws having oppositely arranged
threads or blades and preferably separated by a diaphragm for preventing a meeting
of the two streams before they enter the outlet substantially as described.
2. In apparatus of the kind described two projections arranged radially in the
cylinders between the centre and the respective ends of the screws, for the purpose
of stopping the rotating motion of the water and causing it to enter the outlet
substantially as described.

page_text: 3. The combination and arrangement of parts constituting the complete pump,
motor or like apparatus substantially as
described or illustrated in the
accompanying drawings.
Dated this 25th day of January 1800
BOULT & WADE,
Agents for the Applicants.