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
PROVISIONAL SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A Tank for impregnation


APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
INVENTORS
Khanolkar Amrish and Quadros Noel, both of Crompton Greaves Ltd, M4 Division, Kundaim Industrial Estate, Kundaim, Goa 403115, Goa, India, both are Indian Nationals
PREAMBLE TO THE DESCRIPTION
The following specification describes the invention


This invention relates to a tank for winding impregnation.
A winding impregnation system is used for impregnating electrical motor windings with varnish. In the traditional system, winding impregnation was done in a big tank wherein the varnish was filled in using an electrical pump. The winding was then dipped into the tank and after getting coated it was sent to heating chamber for impregnation. The traditional technique of coating had a few major drawbacks attached to it. The major drawbacks lies with the dependency of the coating system on electric power. In case of power failure, the tank cannot be filled in with varnish. In addition, the traditional system of coating results in major wastage of varnish. As the varnish once used for dipping the winding cannot be used again without recycling, which results in wastage. The major drawback of earlier system was the higher process time required for pumping the varnish in the dipping tank. Another major drawback was non-uniformity in varnish retention.
To overcome the drawbacks mentioned here the proposed invention discloses a gravity operated tank for winding impregnation.
An object of the invention is to provide a gravity operated tank for impregnation.
Another object of the invention is to remove the dependability of the impregnation on electrical power.

An object of the invention is to minimize the wastage of the varnish during impregnation.
Yet another object of the invention is introducing a cost effective technique of impregnation by re-using the varnish after recycling it.
Another object of the invention is to provide a gravity operated tank which can be filled in with varnish without any human intervention.
Another object of the present invention is to provide time controlled impregnation to the winding.
An object of the invention is to provide a user friendly technique of winding impregnation without any hassles.
In accordance with the present invention, a gravity operated tank comprising plurality of tanks. The tanks as disclosed in the invention can be mounted on a common frame. One of the tanks from said plurality of the tank is fixed with respect to the frame and other is suspended on the frame with the help of a pneumatic cylinder.
The pneumatic cylinder as disclosed in the present invention can be supplied with high pressure air supply. The air supply to cylinder can be controlled with a valve which can function as a controlling switch.

The controlling switch as disclosed in the present invention can be time operated and said controlling switch can be operated using two timers, a pneumatic switch and a solenoid valve. The plurality of tanks can be connected with a pipe such that liquid can flow from one tank to another.
In accordance with the present invention the positioning of both the tanks will be controlled with the pneumatic cylinder. If the piston of the pneumatic cylinder is in closed state the movable tank can be immediately above the non-movable tank. Similarly, if the piston position is in open state, the movable tank will be below non-movable tank. The positioning of both the tanks regulates the movement of the liquid present inside the tank.
In accordance of the present invention, before initiating the process of impregnation, the movable tank can be kept at the lower position vis-a vis the non-movable tank. The movable tank can be filled in with the liquid used for impregnation such as but not limited to varnish, etc. The winding, to be impregnated can be kept in the non-movable tank.
The controlling switch as disclosed in the present invention is operated upon to supply high air pressure to the pneumatic cylinder, which results in changing the position of the piston of the pneumatic cylinder. Due to the movement in the position of the pneumatic cylinder the movable tank can gradually starts moving upwards. As soon as the height of the movable tank crosses the height of the non-movable tank, the liquid filled in the movable tank can start flooding inside the non-movable tank

resulting in impregnation of varnish. The movement of the tank can be controlled with a timer.
In accordance of the present invention using the timer, the pneumatic switch can be operated resulting in the changing the position of the piston of pneumatic cylinder. The movement of pneumatic cylinder can bring the movable tank down and as soon as the height of the movable tank reduced then the non-movable tank, the liquid will drained out from the non-movable tank and will be stored back to the movable tank. After the specified time the impregnated winding can be removed and sent to baking oven for heating.
Dated this 19th day of March 2009

(Ivan Bernard Fuller)
ofKhaitan&Co
Agent for the Applicants