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
An in-built scaling protection system for heating element in storage
water heaters
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 025, Maharashtra, India, an Indian Company
INVENTOR
Nadkarni Mayur, of Crompton Greaves Limited, Appliances Division, Kanjur Marg (E), Mumbai - 400042, 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 THE INVENTION:
This invention relates to the field of electrical equipment and home and industrial appliances.
Particularly, this invention relates to storage water heaters.
Specifically, this invention relates to an in-built scaling protection system for heating element in storage water heaters, and water heaters, thereof.
BACKGROUND OF THE INVENTION:
Water heating is a thermodynamic process using an energy source to heat water above its initial temperature. Typical domestic uses of hot water are for cooking, cleaning, bathing, and space heating. In industry, both hot water and water heated to steam have many uses.
Appliances for providing a more-or-less constant supply of hot water are variously known as water heaters, hot water heaters, hot water tanks, boilers, heat exchangers, calorifiers, or geysers depending on whether they are heating potable or non-potable water, in domestic or industrial use, their energy source, and in which part of the world they are found. In domestic installations, portable water heated for uses other than space heating is sometimes known as domestic hot water.
A typical storage water heater has a heating element which is exposed to water. When electricity passes through the heating element, heat generated on the surface of the heating element gets transferred to water, as such, heating the water. The heating element which is exposed to water

has the tendency to form a scaling layer on top of it which reduces the life of heating element over a period of time.
Also, a typical storage water heater works on the principle of displacement i.e. the heated water comes out of the outlet pipe provided there is availability of water at inlet pipe. However, in absence of water inlet and in the event that the heater is switched ON, there are chances that heated water may get evaporated and can expose the heating element to air. This heating element would then be subjected to dry heating leading to failure of same and providing customer dissatisfaction.
OBJECTS OF THE INVENTION:
An object of invention is to eliminate the chances of formation of scaling on heating element in storage water heaters
Another object of the invention is to provide dry heat protection to heating element in storage water heaters.
Yet another object of the invention is to use an in-built protection system for dry heat protection to heating element in storage water heaters.
SUMMARY OF THE INVENTION:
According to this invention, there is provided an in-built scaling
protection system for heating element in storage water heaters, said
system comprises:
a. heating element, within said tank, said heating element being enveloped in an enclosure, said enclosure being a thermally conductive enclosure and outer surface of said enclosure being in

communication with said water, thereby preventing direct contact of said heating element with water in said tank; and b. oil bath adapted to be provided around said heating element, within said enclosure, said oil being heat transfer oil adapted to transfer heat from said heating element to outer surface of said enclosure, thereby heating water in communication with said enclosure in said tank.
According to this invention, there is provided a water heater with an in¬built scaling protection system for heating element, said water heater comprises:
i. tank with an outer body, said tank being adapted to receive water from an inlet pipe and to pass out heater water through an outlet pipe; ii. heating element, within said tank, said heating element being enveloped in an enclosure, said enclosure being a thermally conductive enclosure and outer surface of said enclosure being in communication with said water, thereby preventing direct contact of said heating element with water in said tank; and iii. oil bath adapted to be provided around said heating element, within said enclosure, said oil being heat transfer oil adapted to transfer heat from said heating element to outer surface of said enclosure, thereby heating water in communication with said enclosure in said tank.
Preferably, said inlet pipe comprises an outer flexible inlet portion.
Preferably, said outlet pipe comprises an outer flexible outlet portion.

Typically, said heating element is an electric heating element.
Typically, said system comprises thermostats in order to relay cut-off signals for controlling heating of heating element.
Typically, said tank is a thermally insulated tank.
Typically, said heating element is an electric heating element.
Typically, said system comprises thermostats in order to relay cut-off signals for controlling heating of heating element.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a cut-section schematic of an an in-built scaling protection system for heating element in storage water heaters, and water heaters, thereof.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
In a typical construction and electrical diagram of Storage water heater, water enters the storage water heater from an inlet pipe and gets stored in the tank till the brink of an outlet pipe. Once the water heater is switched ON, the heating element gets power supply and starts heating the water.

The temperature of the heated water is sensed by thermostat and gets cut off when the desired temperature is reached.
Typically, water has salt contents based on hardness of water. Whenever there is salt in the water, water in the immediate vicinity of heating element surface will quickly evaporate leaving the salt behind on to the surface of heating element thus forming scales. Since the heating element will switch ON and Off as per the thermostat settings, this phenomenon occurs repeatedly, thus increasing deposition of scales and resulting in formation of a sheath of layer on the surface of the heating element.
This sheath on to the surface of heating element reduces the thermal conductivity leading to delay in heating of water. Also, over a period of time depending on hardness of water, the heating element bursts, develops cracks, and eventually fails.
Also in case of absence of water, if the water heater is switched ON, there would be dry heating of heating element leading to its failure.
According to this invention, there is provided an in-built scaling protection system for heating element in storage water heaters, and water heaters, thereof.
Figure 1 illustrates a cut-section schematic of an in-built scaling protection system for heating element in storage water heaters, and water heaters (100), thereof.
In accordance with an embodiment to this invention, there is provided a tank (2) with an outer body (3). The tank is adapted to receive water (16)

from an inlet pipe (4) which has an outer flexible inlet portion (5). Water, heated, is passed through an outlet pipe (6) which has an outer outlet flexible portion (7). Reference numeral (8) refers to thermal insulation generally overlapping the tank (2)
In accordance with another embodiment of this invention, there is provided an inbuilt scaling protection system is provided to be incorporated in which a heating element (12) is enveloped in an enclosure (14) which is a good conductor of heat. This prevents direct contact of heating element with water (16). The heating element is an electric heating element.
In accordance with another embodiment of this invention, oil bath (18) is provided around the heating element. This oil is heat transfer oil (18) which is provided between the outer enclosure (14) and heating element (12) surface. The heat transfer oil conducts the heat from the heat transfer element (12) to the enclosure (14) and finally to the water (16).
In this case, the heating element (12) is not exposed to water (16) directly. When electricity is passed, the heating element (12) transfers the heat directly to enclosure (14) through heat transfer oil (18) which, in turn, would transfer the heat to water in the tank.
Thermostats (20) are provided in order to relay cut-off signals for controlling heating of heating element.
With this system, since the heating element is not directly exposed to water, there are no chances of scaling formation on the surface of same, thereby leading to longer life of same.

Also in absence of water, since the heating element is always enclosed in oil bath, even in absence of water, there are no chances for dry heating of
heating element.
Hence, the following advantages can be envisaged:
Inbuilt scaling protection of heating element of water heaters;
No performance deterioration due to low thermal conductivity on
account of scaling formation;
Longer life of heating element in water heaters; and
Dry heating protection of heating element.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and 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.

We claim,
1. An in-built scaling protection system for heating element in storage
water heaters, said system comprising:
a. heating element, within said tank, said heating element being
enveloped in an enclosure, said enclosure being a thermally
conductive enclosure and outer surface of said enclosure being
in communication with said water, thereby preventing direct
contact of said heating element with water in said tank; and
b. oil bath adapted to be provided around said heating element,
within said enclosure, said oil being heat transfer oil adapted
to transfer heat from said heating element to outer surface of
said enclosure, thereby heating water in communication with
said enclosure in said tank.
2. The system as claimed in claim 1, wherein said heating element is an electric heating element.
3. The system as claimed in claim 1, wherein said system comprising thermostats in order to relay cut-off signals for controlling heating of heating element.
4. A water heaters with an in-built scaling protection system for heating element, said water heater comprising:
i. tank with an outer body, said tank being adapted to receive
water from an inlet pipe and to pass out heater water through
an outlet pipe;
ii. heating element, within said tank, said heating element being
enveloped in an enclosure, said enclosure being a thermally

conductive enclosure and outer surface of said enclosure being in communication with said water, thereby preventing direct contact of said heating element with water in said tank; and iii. oil bath adapted to be provided around said heating element, within said enclosure, said oil being heat transfer oil adapted to transfer heat from said heating element to outer surface of said enclosure, thereby heating water in communication with said enclosure in said tank.
5. The water heater as claimed in claim 4, wherein said inlet pipe comprising an outer flexible inlet portion.
6. The water heater as claimed in claim 4, wherein said outlet pipe comprising an outer flexible outlet portion.
7. The water heater as claimed in claim 4, wherein said tank is a thermally insulated tank.
8. The water heater as claimed in claim 4, wherein said heating element is an electric heating element.
9. The water heater as claimed in claim 4, wherein said heater comprising thermostats in order to relay cut-off signals for controlling heating of heating element.