Claims:We claim:
1. A pump assembly comprises of: a spline coupling(101) mounted on a
motor shaft(102); a connecting rod(103) mounted on the said spline
coupling(101); a pump (104) connected to the at end of said connecting
rod(103); a base frame(105) holding a motor(106) at one end &
pump(104) at another end; and an up thrust washer(107) mounted in the
base frame(105).
2. The pump assembly as claimed in claim 1, wherein said spline
coupling(101) further comprises of spline connector(120) having spline in
its inner & outer surface; a hub(121) having spline in its inner surface to
completely adapt the connecter’s outer spline.
3. The pump assembly as claimed in claim 1, wherein base frame(105) have
recess to receive up thrust washer.
4. The pump assembly as claimed in claim 1, wherein up thrust washer(107)
placed above the spline hub(121).
5. The pump assembly as claimed in claim 1, wherein the up thrust
washer(107) retained in base frame in a way that the longitudinal distance
between up thrust washer(107) & hub(121) maintain the maximum float
of the pump.
6. The pump assembly as claimed in claim 1, wherein connecting rod(103)
passes form recess(123) of the up thrust washer.
7. The pump assembly as claimed in claim 1, wherein material of the up
thrust washer not limiting to polyethylene, polypropylene, polystyrene,
polyvinyl chloride, Polyamides, polyester, polycarbonate, polybutane,
Polytetrafluoroethylene, Fluoroplastic, polyacetals, Ferrous Alloy,
Copper Alloy.
8. The pump assembly as claimed in claim 1, substantially described with
reference to the accompanying drawing. , Description:Field of the invention
The present invention relates to pump motor assembly. More particularly, it
relates to a spline coupling with vertical thrust control in helical pump set.
Background of the invention
The present invention relates to pump assembly more particularly it relates to
the spline coupling arrangement adjoining the pump & motor,
In a helical pump assembly helical rotor rotate offset from its centre axis, thus
it’s difficult to connect the helical rotor direct to the pump shaft, hence offset
coupling & flexible connecting rod often to use to connect helical rotor & motor
shaft.
The offset coupling leads to friction thus it increase mechanical losses, which
leads to lower efficiency. Whereas flexible connecting rods are rigidly
connected to the helical rotor & motor shaft, thus offset movement of the helical
rotor trigger the whirling of the shaft, which leads higher vibration & fatigue
failure at joining of the shaft.
A need remains for connecting a helical pump assembly to motor in efficient &
reliable manner.
US patent no. US7905714B2 Describe A progressing cavity pump assembly
includes a collar assembly connecting a housing and a tubing string, with the
collar having an inside diameter upset and the rotor having a rotor head axially
spaced from a rotor helix, with the rotor head having an outer diameter forming
a stop adapted to land on the inside diameter upset. A method of timing a
progressing cavity pump assembly includes providing a collar assembly having
an inside diameter upset, movably connecting the collar assembly and the

housing, providing a rotor having a rotor head axially spaced from a rotor helix,
with the rotor head having an outer diameter forming a stop, selectively
adjusting the relative position of the collar assembly and the housing to form a
pathway substantially corresponding to the rotor helix, landing the stop on the
inside diameter upset, and fixing the relative position of the collar assembly and
the housing.
Objects of the Invention
It is an object of the present invention is to provide a coupling which is capable
to absorb vibration of helical pump set.
It is another object of the present invention is to provide a coupling which
absorbs vibrations & reduces fatigue failure.
It is still another object of the present invention is to provide a coupling which
reduces the frictional losses and increases overall efficiency of the pump
system.
It is further object of the present invention is to provide a coupling which is
efficient & easy to install.
Summary of the Invention
In a helical pump assembly helical rotor rotate offset from its centre axis, thus
it’s difficult to directly connect the helical rotor to the pump shaft, hence offset
coupling & flexible connecting rod use to couple helical rotor & motor shaft.
The offset coupling and connecting rods have their own limitations which leads
frictional losses & fatigue failure.

In accordance with the present invention a pump assembly, comprises of: a
spline coupling mounted on a motor shaft; a connecting rod mounted on the said
spline coupling; a pump unit connected to the said connecting rod; a base frame
holding motor at one end & pump at another end; and an up thrust washer
mounted in the base frame.
Typically the said spline coupling further comprises of spline connector having
spline in its inner & outer surface, placed inside; a hub having spline in its inner
surface to completely adapt the outer spline of the connecter.
Brief Description of Drawings
Figure 1 Illustrates the Cut Section View of the Pump Assembly
Figure 2 illustrates the detailed section view of Spline coupling
Figure 3 Depicts the Exploded View of the Pump Assembly.
Detailed Description of the invention
Hereinafter, various embodiments of the present disclosure will be described
with reference to the accompanying drawings. It should be noted that all of
these drawings and description are only presented as exemplary embodiments.
It is to note that based on the subsequent description, alternative embodiments
may be conceived that may have a structure and method as disclosed herein, and
such alternative embodiments may be used without departing from the principle
of the disclosure as claimed herein.
In accordance with the present invention there is provided a pump assembly,
comprises of: a spline coupling(101) mounted on a motor shaft(102); a
connecting rod(103) mounted on the said spline coupling(101); a pump
unit(104) connected to the said connecting rod(103); a base frame(105) holding
motor(106) at one end & pump(104) at another end; and an up thrust
washer(107) mounted in the base frame(105).
Typically the spline coupling(101) further comprises of spline connector(120)
having spline in its inner & outer surface; a hub(121) having spline in its inner
surface to completely adapt the outer spline of the spline connecter(120).
Hub(121) use to interconnect the spline connector (120) & connecting rod
(103), moreover hub(121) incorporated with collar (122) to limit the insertion of
the spline connector in longitudinal direction.
Typically the base frame(105) is intermediate part, wherein its one of the end
coupled with the motor(106) and another end clamped to the pump(104).
Typically the up thrust washer(107) retained in base frame in a way that the
longitudinal distance between up thrust washer(107) & hub(121) maintain the
maximum float of the pump.
Typically the connecting rod(103) passes form recess(123) of the up thrust
washer & connecting the hub(121) at one end and pump(104) at another end.
Typically the material of the up thrust washer (107) selected from a group not
limiting to polyethylene, polypropylene, polystyrene, polyvinyl chloride,
Polyamides, polyester, polycarbonate, polybutane, Polytetrafluoroethylene,
Fluoroplastic, polyacetals, Ferrous Alloy, Copper Alloy.