Improvements in Auxiliary Exhaust Apparatus for Rotary Pumps.
Year: 1895

page_text: Date of Application, 30th May, 1395--Accepted, 21st Dec., 1895
COMPLETE SPECIFICATION.
Improvements in Auxiliary Exhaust Apparatus for Rotary Pumps.
I, GOTTHARD ALLWEILER, Villa 1, Radolfzell, Bulen-See, Germany, Pamp
Manufacturer, do hereby declare the nature of this invention and in what manner
the saine is to be performed, to be particularly described and ascertained in anl
by the following statement:-
This invention relates to rotary pumps, having for its object the prevention of
the pump becoming inoperative through the valves being frozea to their seats by
providing auxiliary exhaust apparatus adapted to act in such a manner that the
suction and force valves are raised and kept raised from their seats the moment the
vaned plunger or piston reaches and is at rest at the end of its rotary stroke, or by
special independent means: so that the liquid above the suction valves, together
with the contents of the pump chamber cannot collect and choke the pump but are
caused to flow off towards the suction pipe.
In the accompanying drawings Figures 1 to 5 illustrate the construction of one
form of exhaust apparatus in accordance with my invention, and Figures 6 and 7 a
modified form thereof. Figures 8 and 9 and Figures 10 and 11 represent
respectively two other different forms in which this invention may be carried out.
In the form of app iratus shown in Figures 1 to 5 the vanal plunger or piston a
is fitted with two upwardly projecting pins or studs bi which, when the said
plunger a reaches the end of its stroke, take up their positions under the pressure
or force valves c c', thereby ensuring the lifting of the valves from their seats.
The said plunger a is further provided with downwardly projecting pins or
studs d d', arranged so as to alternately meet correspon.ling projections or pins e el
upon the suction valves ff thereby, upon the plunger reaching the extremity of its
stroke, alternately raising the suction valves from their seats within predetermined
limits. By this arrangement therefore when the plunger a is at rest at one end of
its stroke as seen in Figure 1 the pin d ensures the opening of the suction valve f
and the pin the opening of the force valve c¹ the opening of suction valve fl
and force valve e being ensured by the pins d' and b respectively when the plunger
is at the other end of its stroke.
In order to avoid the accidental interruption in the normal operation of the
pun p, in consequence of the vaned plunger being swung round too far, I provide
in one of the walls g of the casing two threaded pins h h so arranged that when in
position their inner ends i serve as stops to limit the motion of the vaned plunger
of the pump, thereby obviating any too extensive swinging movement of the said
plunger which might be caused if the stroke of the said plunger were allowed to
freely affect or influence the valves.
The action of the pump is as follows:-
An oscillating motion is imparted to the pump shaft by suitable means and so
operates the vaned plunger u. Referring to the right hand portion of the pump
Figure 1 it will be obvious that upon the downward movement of the plunger the
water thereunder is compressed, thereby raising the valve in the plunger (the
valve for the sake of clearness being omitted from the drawings) and allowing
the water to escape to the upper side of the plunger. Upon reaching the end of the
downward stroke the pin d upon the plunger is caused to come in contact with
the panjection el upon the valve end thus ensures its opening to permit water to
pass therethrough from the suction pipe. Upon the return upward movement of
the plunger the water above it is now forced through the valve c' to ensure the

page_text: lifting of which the pin is provided and acts as aforesaid. The cycle of working
is repeated inversely in the other half of the pump.
In the arrangement shown in Figures 6 and 7 the suction and force valves are
raised from their seats, not by the vaned plunger, but in a direct manner by two
wedge-shaped points adjustably arranged within the wall g of the casing
opposite the suction and force valves. To this end, the suction valves ff' are
provided with pins or projections 7 extending downwardly, and arranged to meet
the conical wedge k terminating the pin or bolt h, thereby raising the respective
valves from their seats when such wedge k is driven by hand into the interior of
the pump case, between the projections 7 l. The pump chamber is thus connected
with the suction pipe.
In order to enable the force valves c c¹ also to be raised from their seats, a
similar wedge-shaped point is provided on the pin or stud h¹. The valves c
being fitted with corresponding, alternately arranged pins m m¹ it follows that by
driving in the said point ¹ to an adequate extent, the force valves are lifted from
their seats accordingly.
Figures 8 and 9 illustrate another arrangement in accordance with my improve-
ments. Inasmuch as the force valves c c are here situated upon the vaned
plunger a, the suction valves ff are provided with pins 66 which, when the
plunger a attains the end of its stroke, raise the force valves e c¹ from their seats.
The raising of the suction valves f f¹ from their seats is effected by the
projections which are moved apart by the wedge-shaped point at k.
Figures 10 and 11 illustrate a further modification made in an ordinary double-
acting rotary pump. As the plunger a turns round, the force valves c c¹ are raised
by the pins 6 b in a manner similar to that illustrated in Figures 1 to 5 and 8 and 9.
The suction valves are operated in consequence of the pressure exerted by the
pins d d on the plunger a against the projections e e' of the suction valves ffi.
It is obvious that various arrangements and combinations of the devices con-
stituting the exhaust apparatus herein described may be effected without materially
altering or departing from the main features of my said invention.
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 :
The means substantially as herein described and shown for enabling the contents
of a rotary or vaned pump to be fully exhausted or discharged, comprising suction
and force valves adapted to be raised from their seats by projections, such as bd
formed on, or scenred to, the winged plunger of the pump; or by adjustable
wedge-shaped points or pin, such as Angel to get in conjunction with pro-
jections, such as; or through any equivalent combination of such arrangements
or devices.
ד
333
T. B. BROWNE, LIMITED,
Agents.
Ry Benj. T. King,
Registered Patent Agent.