FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
PROVISIONAL
Specification
(See section 10 and rule 13)
PUMPING SYSTEM
KIRLOSKAR BROTHERS LIMITED
an Indian Company
of Udyog Bhavan, Tilak Road, Pune 411 002,
Maharashtra, India
THE FOLLOWING SPEC IFICATION DESCRIBES THE INVENTION.

This invention relates to a pumping system.
Particularly, this invention relates to the pumping efficiency of the pumping system.
The most common applications for pumps are for fresh water supply, heating & cooling systems, waste water treatment and drainage systems.
In systems with little change in demand, pumping system efficiency depends largely on selecting the correct pump size. In systems with variable demand, pump system efficiency depends on effectively matching supply with demand, which can be achieved in several ways, depending on system requirements.
Efficiency of the pumping system is given by the following formulae:

where,
hst = Static head in m
Q = Discharge in I/s
IPkW = Input power in kW
The efficiency of the pumping system can be increased either by increasing discharge rate Q or by reducing power consumption IPkW. The discharge rate Q is increased with the same power consumption and thus the pumping
efficiency (h) is increased.
2

In accordance with this invention, a device called "discharge add-on" is fitted to the delivery pipe of the pump, which is connected to the water source through a suction pipe and a discharge pipe, the said apparatus comprises: -
1. an ejector body having threaded connections: two external and
one internal to connect three pipes, one to delivery pipe of the
pump which is connected with the help of pipe socket, one to the
water source, directly tightened to the housing and one to the
final discharge pipe connected with the help of pipe socket. This housing is having threaded connections to accommodate nozzle and venturi;
2. a nozzle with covering area;
3. a venturi with converging, straight and diverging area.
The device according to this invention comprises: -
1) an ejector body having threaded connections: two external and one internal to connect three pipes, one to delivery pipe of the pump which is connected with the help of pipe socket, one to the water source, directly tightened to the housing and one to the final discharge pipe connected with the help of pipe socket. This housing is having threaded connections to accommodate nozzle and venturi.
2) a nozzle with covering area.
3) a venturi with converging, straight and diverging area.
The invention will now be described with reference to the accompanying drawings, which shows the scheme of the system in accordance with this invention:
3

The water from delivery pipe (1) of the pump (8) passes through nozzle (3), which increases the velocity of water. When the water passes through the nozzle (3), the pump (8) operating point (namely total head, discharge and power consumption) gets fixed and further addition of water does not affect the pump operating point.
The high velocity water from nozzle enters the converging portion of venturi (4) and pushes the water available in the annular area between nozzle (3) and venturi (4) towards throat (straight portion) of venturi (4). This action creates vacuum in the annual area between nozzle (3) and venturi (4) which sucks additional water from the water source (7) through suction pipe (6). The water sucked from the water source (7) is mixed with the high velocity water in the throat portion of the venturi (4) and passes through the divergent portion of the venturi (4). In this portion, velocity is converted into pressure and water finally flows through final discharge pipe (5).
By changing the dimensions of 'discharge add-on' components, the operating point of the pump can be controlled.
This arrangement helps in sucking additional water from the water source without consuming extra power and thereby improving pumping efficiency substantially.
While considerable emphasis has been placed herein on the various components of the preferred embodiment, it will be appreciated that many alterations can be made and that many modifications can be made in the preferred embodiment without departing from the principles of the invention. These and other changes in the preferred embodiment as well as
4

other embodiments of the invention will be apparent to those skilled in the
5
art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.