FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF INVENTION
Self driven vane type water pump
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 025, Maharashtra, India, an Indian Company
INVENTOR
Khedkar Parag Prabhakar, Crompton Greaves Limited, Technology Cell, Switch Gear (S3) Division, A3 MIDC, Ambad, Nashik 422010, Maharashtra, India, an Indian National
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed :

FIELD OF INVENTION
This invention relates to a self driven vane type water pump.
This invention relates particularly to a self driven vane type water pump for use as a booster or auxiliary pump to an electrical pump for pumping water into overhead tanks or to higher levels.
BACKGROUND OF INVENTION
Water pumped or flowing from a source of supply or reservoir into distribution lines or feeder lines, especially in towns and cities, is normally collected in underground tanks, pumped up by electric pumps into overhead tanks and allowed to flow down to utility points under gravity. This is basically because the pressure with which the water flows into the distribution lines or feeder lines is not sufficiently strong enough to lift the water directly into the overhead tanks located at heights meters above the ground level. The energy in the water getting collected in the underground tank is thus wasted without any work being done. Electric pumps consume electrical energy for their operation and require periodic maintenance. Also if there is a breakdown of the electric pumps, water cannot be pumped up into the overhead tanks until the pumps are repaired. This disrupts temporarily water supply to the utility points causing a lot of inconvenience and hardship to the users.
Vane pumps used for pumping water require electrical energy for their operation. A typical vane pump comprises a casing provided with an inlet hole and an outlet along the same line in the side wall thereof. A rotor is mounted on a shaft eccentrically rotatably held in the casing. The rotor comprises a plurality of spring biased vanes
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held in the rotor radially spaced apart. The outer ends of the vanes press against the inner surface of the sidewall of the casing. The pump is driven by an electric motor whose shaft is coupled to the pump shaft. During rotation of the vanes with the rotor, water is sucked in through the inlet hole into the space between two adjacent vanes on either side of the inlet hole and is forced out through the outlet hole by the trailing vane of the two adjacent vanes. A vane pump is expensive as it requires electric motor and electric energy for its operation. The electric motor also requires periodic maintenance. If there is a break down of the electric motor, the pump cannot be operated until the motor is repaired thereby temporarily disrupting the water supply. Also in a given construction of the vane pump, the output pressure is fixed and cannot be varied.
OBJECTS OF INVENTION
An object of the invention is to provide a self driven vane type water pump which does not require any external energy input for its operation and is cost effective, simple in construction and easy to operate.
Another object of the invention is to provide a self driven vane type water pump, whose output pressure can be varied in a given construction of the pump.
Another object of the invention is to provide a self driven vane type water pump, which can be used as a booster or auxiliary pump to an electric pump so as to reduce the energy consumption of the electric pump and realise savings in cost and to ensure water distribution at utility points in case of breakdown of the electric pump.
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DETAILED DESCRIPTION OF INVENTION
According to the invention there is provided a self driven vane type water pump located above an underground tank and comprising a casing provided with mounting means for mounting it on the underground tank and at least one inlet hole and at least one outlet hole in the sidewall thereof along the same line, a rotor mounted on a shaft eccentrically rotatably held in the casing, the rotor comprising a plurality of spring biased vanes held in the rotor radially spaced apart, the outer ends of the vanes pressing against the inner surface of the sidewall of the casing, the inlet hole being connected to the underground tank and the outlet hole being connected to an overhead tank, the pump being driven by a motor located above the underground tank and comprising a housing provided with mounting means for mounting it on the underground tank in tandem with the pump, the housing comprising an inlet port and an outlet port provided in the side wall thereof along the same line, the inlet port being connected to an incoming water supply through a valve and the outlet port being connected to the underground tank, a rotor mounted on a shaft eccentrically rotatably held in the housing and comprising a plurality of spring biased vanes held in the rotor radially spaced apart, the outer ends of vanes pressing against the inner surface of the sidewall of the housing, the shafts of the pump and motor protruding out of the respective casing and housing and being coupled together, the housing being larger in volume than the casing and the volume ratio between the housing and casing being selected to increase the pressure output of the pump.
The following is a detailed description of the invention with reference to the accompanying schematic drawings, in which:
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Fig 1 is an elevation of the self driven vane type water pump according to an
embodiment of the invention;
Fig 2 is an isometric view of the pump of Fig 1 without the end covers;
Fig 3 is a section at X-X in Fig 1;
Fig 4 is a section at Y-Y in Fig 1;
Fig 5 is an exploded view of the pump of the Fig 1;
Fig 6 is a crossectional view of part of the self driven vane type pump according to
another embodiment of the invention;
Fig 7 is a crossectional view of part of the self driven vane type pump according to
another embodiment of the invention; and
Fig 8 is schematic illustration of a typical application of the pump of Figs 1 to 5, Fig 6
or Fig 7;
The pump 1 as illustrated in Figs I to 5 of the accompanying drawings comprises a
casing 2 having a cylindrical inner surface and provided with a mounting base 3
which in turn is provided with mounting bolt holes 4. The casing is provided with
inlet hole 5 and outlet hole 6 in the side wall thereof along the same line. 7 is a rotor
mounted on a shaft 8 eccentrically rotatably held in the casing. The rotor comprises a
plurality of slots 9 radially equidistantly provided around it. A vane 10 is located in
each of the radial slots biased by spring 11. The outer ends of the vanes press against
the liner in the casing. 12 is a housing having a cylindrical inner surface and provided
with a mounting base 13 which in turn is provided with mounting bolt holes 14. 13a
is a replaceable liner located in the housing and retained in position by retainer screw
13b extending into the liner through the sidewall of the housing. The housing is
provided with an inlet port 15 and an outlet port 16 in the side wall thereof along the
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same line. 17 is a rotor mounted on a shaft 18 eccentrically rotatably held in the housing. The rotor is provided with a plurality of radial slots 19 equidistantly spaced around it. A vane 20 is located in each of the radial slots biased by spring 21. The outer ends of the vanes press against the inner surface of the sidewall of the housing. The end covers 22 of the casing are provided with mounting lugs 23 with holes 24 therein. Matching lugs 25 with holes 26 are provided on the casing. The end covers 27 of the housing are provided with mouting lugs 28 with holes 29. Matching lugs 30 with holes 31 are provided on the housing. The end covers are detachably fitted to the casing and housing by aligning the lugs of the end covers with the lugs of the respective casing and housing and fitting the end covers onto the casing and housing with screws (not shown) engaged in the holes in the lugs of the end covers and the holes in the respective lugs on the casing and housing. The shafts of the pump and motor protrude out of the respective casing and housing and are coupled together by coupling 32. The housing is larger in volume than the casing. As shown in Fig 8 of the accompanying drawings, the pump of Figs 1 to 5 is mounted on an underground tank 33 with bolts (not shown) fitted in the mounting holes in the mounting bases of the casing and housing and the top surface of the underground tank. Inlet port of the housing is connected to an incoming water supply line 34 through a valve 35. The ground level is marked 34a in Fig 8. The outlet port of the housing is connected to the underground tank via line 35a. The inlet hole of the casing is connected to the underground tank and outlet hole of the casing is connected to an overhead tank (not shown) via lines 36 and 37, respectively. 38 is an electric pump located above the underground tank with the suction line 39 extending into the underground tank and discharge line 40 connected to the overhead tank. During working of the pump valve 35 is opened to allow incoming water in the supply line 34 to enter the housing in the
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space between two adjacent vanes through the inlet port. Because of the pressure of the incoming water acting against the two adjacent vanes and because of the eccentricity of the vanes, the two adjacent vanes move and rotate in the clockwise or forward direction. During rotation of the two adjacent vanes in the clockwise direction, water in the space between the two adjacent vanes is pushed out into the underground tank by the trailing vane. This is repeated so as to rotate the rotor and the vanes in the housing continuously one after another. Thus the motor operates under the pressure of the incoming water without any additional energy input. The springs will contract and expand so as to facilitate rotation of the vanes with the outer ends of the vanes pressed against the inner surface of the housing. Due to rotation of the vanes of the motor, the motor shaft also rotates. The rotational movement of the motor shaft is transferred to the pump shaft to rotate the pump rotor and vanes. As the vanes of the pump rotate water is sucked into the space between two adjacent vanes in the casing via the inlet port and is forced out into the overhead tank via the outlet port by the trailing vane of the two adjacent vanes. This is continuously repeated by the pairs of vanes so as to ensure continuous pumping of water into the overhead tank. The operation of the pump will continue until there is incoming water in the water supply line.
The pump as illustrated in Fig 6 of the accompanying drawings comprises a housing 41 having an elliptical shaped inner surface. A pair of inlet ports and outlet ports 42a and 43a and 42b and 43b are provided in each of the long sections or sides of the casing. Each inlet port and corresponding outlet port are along the same line. Incoming water flows into both the inlet ports and water is forced into the overhead tank through both the outlet ports simultaneously thereby increasing the quantity of
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water being pumped into the overhead tank. The pump as illustrated in Fig 7 of the accompanying drawings comprises a housng 44 without the liner and is of fixed volume.
According to the invention the pump operates under the influence of the pressure of the incoming water from the supply line without using any external energy input. Therefore, the pressure available in the incoming water is fully utilised without being wasted. The pump of the invention is cost effective and simple in construction and easy to operate. The output pressure of the pump ie the pressure available for pumping the water into the overhead tank can be varied in a given pump by replacing the replaceable liner so as to create variable volume within the housing and variable volume ratio between the housing and casing. The output pressure will obviously depend upon the volume ratio between the housing and casing. The volume ratio is selected to increase the pressure output. The liner is, however, optional and the pump can work without the liner. Once the incoming water in the supply line has completely stopped, the water in the underground tank is lifted into the overhead tank by operating the electric pump. The pump of the invention can be effectively used as a booster or auxiliary pump to the electric pump so as to reduce the energy consumption of the electric pump and save cost further. Additionally in the case of break down of the electric pump, the pump of the invention still ensure lifting of a certain amount of water into the overhead tank so as to ensure water distribution at the utility points atleast for sometime until the electric motor is repaired or replaced.
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Using a typical pump of the invention comprising housing and casing with a volume ratio 2:1 and an incoming water of pressure of 15 Kg sq m it was possible to increase the pressure of the out flowing water to 3 Kg sq m The out flowing water at this output pressure can be easily lifted to a height of 20-25m.
The detachable end covers will facilitate easy access into the casing or housing for replacement of the springs or vanes or cleaning or the like. The objective of the invention is essentially to make effective use of the energy available in the incoming water. Instead of water, other liquids or fluids can also be used for driving the pump of the invention. Essentially the device is for increasing the pressure output. Instead of lifting the water into overhead tanks, it can also be used for lifting the water to a higher level or driving a load like actuators. The mounting bases are optional and can be of a different construction or configuration. The pump can be located in position under its own weight without the mounting means. Such variations of the invention are to be construed and understood to be within the scope of the invention.
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We claim:
1. A self driven vane type water pump located above an underground tank and comprising a casing provided with mounting means for mounting it on the underground tank and at least one inlet hole and at least one outlet hole in the sidewall thereof along the same line, a rotor mounted on a shaft eccentrically rotatably held in the casing, the rotor comprising a plurality of spring biased vanes held in the rotor radially spaced apart, the outer ends of the vanes pressing against the inner surface of the sidewall of the casing, the inlet hole being connected to the underground tank and the outlet hole being connected to an overhead tank, the pump being driven by a motor located above the underground tank and comprising a housing provided with mounting means for mounting it on the underground tank in tandem with the pump, the housing comprising an inlet port and an outlet port provided in the side wall thereof along the same line, the inlet port being connected to an incoming water supply through a valve and the outlet port being connected to the underground tank, a rotor mounted on a shaft eccentrically rotatably held in the housing and comprising a plurality of spring biased vanes held in the rotor radially spaced apart, the outer ends of vanes pressing against the inner surface of the sidewall of the housing, the shafts of the pump and motor protruding out of the respective casing and housing and being coupled together, the housing being larger in volume than the casing and the volume ratio between the housing and casing being selected to increase the pressure output of the pump.
2. A water pump as claimed in claim 1, which comprises a replaceable liner located within the housing thereof and provided with holes corresponding to the inlet
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hole and outlet hole in the housing, the outer ends of the vanes of the rotor of the motor pressing against the inner surface of the liner.
3. A water pump as claimed in claim 1 or 2, wherein the inner surface of the housing or casing is cylindrical or elliptical shaped.
4. A water pump as claimed in claim 1 or 2, wherein the inner surface of the casing is cylindrical or elliptical shaped and the inner surface of the housing is elliptical shaped and comprises one inlet hole and one outlet hole in each of the long side walls of the casing directly opposite to each other.
5. A water pump as claimed in anyone of claims 1 to 4, wherein the end covers of the housing and casing are detachable.
Dated this 29th day of March 2007.

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Abstract
A self driven vane type water pump (1) located above an underground tank. It comprises a casing (2) provided with mounting means (3) for mounting it on the underground tank and at least one inlet hole (5) and at least one outlet hole (6) in the sidewall thereof along the same line. A rotor (7) is mounted on a shaft (8) eccentrically rotatably held in the casing. The rotor comprises a plurality of spring biased vanes (10) held in the rotor radially spaced apart. The outer ends of the vanes press against the inner surface of the sidewall of the casing. The inlet hole is connected to the underground tank and the outlet hole is connected to an overhead tank. The pump is driven by a motor located above the underground tank and comprising a housing (12) provided with mounting means (13) for mounting it on the underground tank in tandem with the pump. The housing comprises an inlet port (15) and an outlet port (16) provided in the side wall thereof along the same line. The inlet port is connected to an incoming water supply through a valve and the outlet port is connected to the underground tank. A rotor (17) is mounted on a shaft (18) eccentrically rotatably held in the housing and comprising a plurality of spring biased vanes (20) held in the rotor radially spaced apart. The outer ends of vanes press against the inner surface of the sidewall of the housing. The shafts of the pump and motor protrude out of the respective casing and housing and are coupled together. The housing is larger in volume than the casing and the volume ratio between the housing and casing is selected to increase the pressure output of the pump (Fig 2).