FORM 2
THE PATENTS ACT, 1970
(39 of 1970) As amended by the Patents (Amendment) Act, 2005
AND
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A regenerative pump with floating impeller
APPLICANTS :
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S):
Ingale Vijay, Deshmukh Sandip and Bhosale Patangrao of Crompton Greaves Ltd, Pump (M5) Division, A-28, MIDC, Ahmednagar - 414111, Maharashtra, India; all Indian Nationals.
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 the Invention:
This invention relates to the field of pumps.
Particularly, this invention relates to the field of horizontal type self priming pumps.
Still particularly, this invention relates to the field of regenerative pump with floating impeller.
Background of the Invention:
Pumps are typically used to move fluids such as liquids from low pressure to high pressure. They help in drawing out liquids from suction and delivering them through an output delivery. Pumps include impellers which increase pressure in a pump because of rotation, thus allowing flow of liquid. An impeller is typically mounted on rotor. Conventional pumps include an impeller placed between a suction chamber and a delivery chamber, which impeller is of fixed type.
In conventional method, an impeller is fixed on a shaft by key due to which, in operating conditions, it causes component and performance failure problems because of rubbing / touching impeller to suction and delivery chambers. These impellers are fixed type impellers.
Pump performance and life is also limited due to this design.

Objects of the Invention:
An object of the invention is to improve performance and life of a pump.
Another object of the invention is to reduce component failure in pump.
Yet another object of the invention is to eliminate pump jam.
Summary of the Invention:
According to this invention, there is provided a regenerative pump with floating impeller comprising an impeller on shaft, said impeller being a floating impeller adapted to provide clearance between impeller bore and shaft such that impeller can float only in the woodruff key area, thereby keeping said impeller in centre position between suction casing and delivery casing while in operation.
Typically, said impeller is a floating impeller adapted to float on shaft between suction casing and delivery casing of said pump.
Typically, said impeller is mounted on shaft with keyway.
Typically, said impeller is mounted on shaft with keyway with key.
Typically, said impeller is mounted on shaft with keyway with Woodruff key.
Typically, said pump includes a motor.

Typically, said pump includes a single phase motor. Typically, said impeller is a Star type impeller. Brief Description of the Accompanying Drawings:
Figure 1 illustrates a pump with impeller in accordance with the prior art.
This invention will now be described in relation to the accompanying drawings, in which:
Figures 2 and 3 illustrate a schematic of said regenerative pump with floating impeller; and Figure 4 illustrates an impeller.
Detailed Description of the Accompanying Drawings:
Figure 1 illustrates a pump with impeller in accordance with the prior art. This is a Mono-block type, single stage, Self priming pump. This is a horizontal type of pump with regenerative type of impeller. Motor used for this type of pump is typically of single phase and of 4 poles.
Impeller (2) is of Star type. Typically, it has 24 Blades of equal size. Impeller is placed between Suction Casing (1) and Delivery casing (3). While assembling, Impeller (2) is mounted on subassembly of shaft (4) and woodruff key. Impeller (2) is fixed and locked in this position throughout the operation of the pump.

There is always water in the Suction chamber (8) and Delivery Chamber (10) as this pump is self priming type. Gasket (6) is used to prevent the leakage from Suction Casing (1) and Delivery casing (3). When pump starts, Impeller (2) will always remain in position as fixed in assembly, without any axial movement on shaft which can further cause jamming of impeller, as clearance between Impeller and suction (1) and delivery casings (3) is very less.
According to this invention, there is provided a regenerative pump with floating impeller.
Figures 2 and 3 illustrate a schematic of said regenerative pump with floating impeller. Figure 4 illustrates an impeller.
In accordance with this invention, there is provided an impeller (20) which is a floating impeller such that floating impeller clearance between impeller bore and shaft is kept such that impeller (2) can float only in the woodruff key area and there will not pump jam problem.
It keeps Impeller in centre position between Suction and Delivery casing while in operation. It reduces touching / rubbing of Impeller to Suction and Delivery casing. It also reduces Component failure, Pump jam in Regenerative pump group.
Typically, Impeller floats on shaft between Suction and Delivery Casing.
This is a Mono-block type, single stage Self priming pump. This is a horizontal type of pump with regenerative type of impeller. Motor used for this type of pump is of single phase and of 4 poles.

Impeller (2), in this invention, is of Star type. Typically, it has 24 Blades of equal size. Impeller is placed between Suction Casing (1) and Delivery casing (3). It is mounted on shaft (4) with keyway (5).
Key used in this type of Invention is Woodruff Key.
There is always water in the Suction chamber (8) and Deliver)' Chamber (10) as this pump is self priming type. Gasket (6) is used to prevent the leakage from (1) and (3) When pump starts, Impeller (2) floats on shaft (4), as there is a flow from suction side (7). As water moves from suction to delivery side, same pressure on both side of Impeller is maintained because of impeller construction. As pressure is balanced on both sides, impeller automatically remains in center position.
So during operation, Impeller always remains in center position as per ideal design requirement and the process of Water entry from Inlet (7) and discharged through outlet (9) is going on without any component failure.

We claim,
1. A regenerative pump with floating impeller comprising:
- an impeJJer on shaft, said impeJJer being a floating impeJJer adapted to provide clearance between impeller bore and shaft such that impeller can float only in the woodruff key area, thereby keeping said impeller in centre position between suction casing and delivery casing while in operation.
2. A pump as claimed in claim 1 wherein, said impeller is a floating impeller adapted to float on shaft between suction casing and delivery casing of said pump.
3. A pump as claimed in claim 1 wherein, said impeller is mounted on shaft with keyway.
4. A pump as claimed in claim 1 wherein, said impeller is mounted on shaft with keyway with key.
5. A pump as claimed in claim 1 wherein, said impeller is mounted on shaft with keyway with Woodruff key.
6. A pump as claimed in claim 1 wherein, said pump includes a motor.
7. A pump as claimed in claim 1 wherein, said pump includes a single phase motor.
8. A pump as claimed in claim 1 wherein, said impeller is a Star type impeller.