[001] The present invention generally relates to home appliances. The present invention more particularly relates to an induction water heater having optimal number of heating coils for optimal heating of water and power consumption.
BACKGROUND AND PRIOR ART:
[002] Water heaters have been around for many years as a device for water heating for domestic purpose. The popular heating technology over the years is a resistive heating (Heating Element/ Calrod) that heat the water. Many of the water heaters have problems such as scaling on the heating elements, different power consumption over the age of product i.e. non-uniform heating during product life, Bubbles in the water and noise during use.
[003] Recent advancement in heating technology is heating by induction. Various methods have been adopted to improve the water heating technology by providing electro-magnetic induction water heating. Reference may be made to the following:-
[004] Publication No. CN202328804 (Dl) discloses a variable-frequency water heater, which comprises a shell body and a water heating tank, wherein the water heating tank is fixedly arranged in the shell body, and a water inlet pipe and a water outlet pipe are connected onto the water heating tank. The variable-frequency water heater is characterized in that: a definite number of electromagnetic induction heating coils are sleeved on the external surface of the water heating tank; the water heating tank is provided with a temperature control sensor; and a control panel for controlling the electromagnetic induction heating coils and the temperature control sensor is fixedly arranged in the shell body.
[005] Indian Publication No. 201627004225 (D2) discloses water heater comprising a tank for holding water the tank being delimited by a peripheral jacket and the wall of a leak tight sheath that dips into the internal volume of the peripheral jacket and an electric heating device characterized in that the heating device comprises at least one inductor housed in the sheath and at least one filler

formed by at least a part of the wall of the sheath. The technical effect, induced by the use of a sheath comprising at least one inductor, is that of generating currents induced directly in the sheath and thus promoting a more rapid heating effect.
[006] Indian Publication No. 2118/DEL/2015 (D3) relates to a field of harmonic electric water heater, power supply equipment and heating method thereof. The water heater or geyser comprises of a harmonic generator generating a harmonic supply by means of a oscillator circuit which is producing an output of standard 220 V with a frequency of 150 Hz. The plurality of heating plates connected lu the oscillator circuit by means of a transformer consisting of a primary winding having a predetermined number of turns and a secondary winding having a predetermined number of turns, the secondary winding being electrically conductive, wherein current is supplied to the primary winding of the heating unit by the oscillator circuit, creating an electro-magnetic field around the primary winding that couples- with the secondary winding, thereby inducing high frequency current in the secondary winding and heating the secondary winding and the water flowing through the heating plates.
[007] Publication No. CN205919501 (D4) discloses magnetic eddy current heater forever relating to a permanent magnetism heater, and external rotor permanent -magnet machine stator module comprise stator core, coil, and stator module connects the pressure equipment on stator axle, permanent magnet yoke inner wall is through sticky a week motor permanent magnet, the outer wall is with sticky water heater permanent magnet, external rotor permanent-magnet machine front end housing, motor rear end cap centre bore stud with bearing, bearing inner diameter and stator axle pressure equipment, external rotor permanent-magnet machine front end housing, motor rear end cap end are continued to use the bolt and are connected with yoke, the water heater body spiral copper pipe is fixed on heater shell through the foamer, water heater rear end cap is passed through the key-type connection with water heater front end housing centre bore and is fixed with stator axle.

[008] Publication No. CN105444418 (D5) discloses a safety shield applied onto an electric water heater. The safety shield comprises a casing, a base, a container and an electromagnetic induction heater, wherein the electromagnetic induction heater comprises an electromagnetic induction coil and an eddy current heating element arranged in an electromagnetic induction coil alternating magnetic field. A circuit board and a cooling fan are arranged in the base, and cooling holes are formed in the lateral wall of the base and covered with a splash-proof petticoat.
[009] Publication No. CN201429207 (D6) discloses a wall-mounted boiler device with the function of electromagnetic eddy-current heating. The wall-mounted boiler device consists of a box body, an electromagnetic eddy-current heating device, an expansion tank, a circuit control plate, a function display panel, a three-way electromagnetic control valve, a circulating pump, a heat exchanger, a tap water make-up pipe, a warming-use water return pipe, a bathing-use hot water pipe, and a warming-use water outlet pipe, which are connected with each other. The utility model relies on the electromagnetic eddy-current heating device in heating to realize the complete water-electricity separation in the electric water heater.
[0010] Publication No. CN2208198 (D6) discloses a novel electromagnetic water heater. A metal heater is arranged in a heat change water tank which is provided with a water inlet and a water outlet, and an eddy current coil curl which is connected with the generator of a high frequency power source is surrounded at the outside of the wall of the water tank in an insulating way.
[0011] Publication No. CN2440180 (D7) discloses an induction type heating energy-saving device used for electric water-heating boilers and domestic water heaters, which adopts an induction heating mode of parallel resonance; the utility model is composed of an induction winding, an induction heater of eddy current, a capacitor bank and a voltage regulating element. The induction winding and a capacitor are formed into a parallel resonance circuit; the induction heater of eddy current is installed on the inner side of a barrel-arranged water container of an

electric water-heating boiler or a domestic electric water heater in packs to form a heating element of eddy current with a barrel wall.
[0012] Publication No. CN106304448 (D8) discloses an
electromagnetic induction-type water heater heating rod, which is composed of an insulated shell, a coil disc, a flange disc, metal plates, fixing seats, and a metal heat conduction pipe, wherein the coil disc is placed in the insulated shell; metal plates are arranged outside the insulated shell; and the metal plate is parallel with the corresponding bottom surface of the insulated shell. The electromagnetic induction-type water heater heating rod of the invention is arranged in a water heater water tank; when high-frequency AC passes through the coil of the coil disc, an AC magnetic field is generated; when magnetic lines of force in the magnetic field arrive at the metal plate, eddy current is generated on the surface of the metal plate, and the metal plate is heated; water flowing through a space layer is magnetized.
[0013] Publication No. CN202562006 (D9) discloses an induction heating coil for an instant electromagnetic water heater comprising an outer cylinder, an inner cylinder and a connecting pipe, wherein the outer cylinder is arranged outside the inner cylinder; the end part of the inner cylinder exceeds the end part of the outer cylinder; the outer cylinder and the inner cylinder are communicated with each other through the connecting pipe; a water inlet joint is arranged on the outer cylinder; a water outlet joint is arranged on the inner cylinder; a baffle is arranged at the end part of the outer cylinder; a through hole is formed on the baffle close to the inner cylinder; a high-temperature insulating layer is arranged outside the inner cylinder; a high-temperature insulated wire is arranged in the high-temperature insulating layer; and the high-temperature insulated wire penetrates through the through hole. An annular magnetic circuit is formed between the inner cylinder and the outer cylinder, the electromagnetic radiation generated in the work is shielded by the outer cylinder, and the heat generated by the electromagnetic radiation on the outer cylinder due to the eddy current is taken away by the flowing-through cold water out flowing from the inner cylinder.

[0014] Publication No. CN201897309 (D10) discloses an electromagnetic water heater used for bathing. A heating wire coil is arranged below an iron water storage tank, a circuit board is arranged below the heating wire coil, an electronic element is arranged on the circuit board, and a power plug and a button switch are arranged at the side of the water heater.
[0015] Publication No. CN201628361 (Dll) discloses a double-side electromagnetic induction type electric water heater, which comprises a casing, a water inlet pipe and a water outlet pipe, wherein an electromagnetic induction coil is arranged in the casing, tubular iron heaters are arranged on two sides of the electromagnetic induction coil, and the tubular iron heater on one side is connected with the water inlet pipe while the tubular iron heater on the other side is connected with the water outlet.
[0016] Publication No. CN201121976 (D12) discloses an electromagnetic instantaneous electric water heater, characterized in that the electromagnetic induction heating wire coil bracket and the wire coil are fixed inside the shell body, the fire resistant panel is fixed on the electromagnetic induction heating wire coil, the iron micro-thermal liner is installed on a tray inside the shell body, the iron micro-thermal liner is fastened via a locating knob inside the shell body and then is contacted with the fire resistant panel, the iron micro-thermal liner is in threaded connection with a micro-thermal liner cover via a high temperature sealing ring, and a thermal liner cover is provided with a water inlet tap and a water outlet tap.
[0017] Publication No. CN1566856 (D13) discloses an electromagnetic water heater adopting electromagnetic induction heating technology.
[0018] Publication No. CN202719745 (D14) discloses a rapid heating energy-saving heater of an electric water heater wherein an electromagnetic induction coil and a high-frequency generation control unit for controlling the electromagnetic induction coil are arranged below the heating tank; an isolating plate is arranged between the electromagnetic induction coil and the heating tank;

and the electromagnetic induction coil and the isolating plate are fixedly arranged on a fixed bracket.
[0019] Indian Publication No. 518/MUMNP/2015 (D15) discloses a device for the induction heating of a water heater and a water heater provided with such a device. The water heater is characterised in that the heating means comprise a power generator and an inductive module formed from at least one inductor and at least one load the inductor being configured to generate a current induced in the load the inductor and at least one load being submerged in the volume of water to be heated.
[0020] Thus in view of the above prior arts, induction water heating technology provides the fastest and uniform heating with overall less power consumption annually as this technology is superior to the existing resistive heating technology in which heating efficiency reduces with the time of usage and different level of water TDS level.
[0021] Hence, the present invention aims to provide an improved induction water heater (geyser) to have water heating in tank in place of resistive heating for providing better heating efficiency with less power consumption (uniform power consumption and heating efficiency for complete geyser life) and removing heating element which is getting failed due to salt deposition on it.
OBJECTS OF THE INVENTION:
[0022] The principal objective of the present invention is to provide an induction water heater having optimized heating coils for optimized heating of water.
[0023] Another object of the present invention is to provide heating of water via tank heating by the means of Inductive heating.
[0024] Yet another object of the present invention is to reduce the power consumption of the water heater.
[0025] Still another object of the present invention is increase the life of the water heater.

[0026] Still another object of the present invention is to provide fastest way of water heating in initial temp rise upto 55°C.
SUMMARY OF THE INVENTION:
[0027] In accordance with the said objectives, the present invention provides an induction water heater having optimized heating coils for optimized heating of water. The induction heating unit is installed on the water heater body on any side selected from left side, right side or front side of the metal tank. The water heater has outlet pipe and inlet pipe. The induction heating unit has a plastic cover, curved coil, PCB, sensors and a cooling fan to cool coil and PCB simultaneously. Present induction water heater is provided to heat the water in a wall mounted water tank heater, in place of heating the water using a heating rod/element in the water tank with lower Watt density, by creating the heat in the tank wall by the means of electromagnetic induction and eddy current generation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0028] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0029] Figure 1 discloses the inner structure and components of the induction water heater according to the present invention;
[0030] Figures 2(a) and 2(b) show fan and PCB mounted on plastic cover;

[0031] Figure 3 shows the block diagram for the functioning of the induction water heater;
[0032] Figures 4 & 6 show gap and optimized coupling between curved coil and tank of the water heater.
[0033] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0034] The present invention will be described in detail below with reference to an embodiment as shown in the drawing.
[0035] Accordingly the present invention provides an induction water heater (100) having optimized heating coils for optimized heating of water. This heating is achieved by heating the water storage tank by generating the eddy current in the tank body.
[0036] Figure 1 shows the inner structure and components of said induction water heater (100) with an induction heating unit (100a) according to the present invention. Said induction heating unit (100a) is installed on the body (1) of said water heater (100) on any side selected from left side, right side or front side of a metal tank (2). Said water heater (100) has an outlet pipe (3) and an inlet pipe (4). Cold water enters said induction water heater from said inlet pipe (4) and after heating, the hot water comes out from said outlet pipe (3).
[0037] Said induction heating unit (100a) has a plastic cover (5), a curved coil (6), a PCB (7), sensors (8) and a cooling fan (9) to cool said curved coil (6) and said PCB (7) simultaneously.
[0038] Novel curved coils (6), according to the present invention, provide optimized heating to tank and optimized coupling between coil and tank. Said

PCB (7) and said cooling fan (9) are mounted on said plastic cover (5). Said cooling fan (9) in addition to cooling of said PCB (7) and said coil (6), also provides optimized air flow to have proper functioning of said coil (6) and said PCB (7). Said Coil (6) and said PCB (7) are mounted in such a way that both are 5 cooled together by said cooling fan (9).
[0039] Figure 2(a) and 2(b) show said fan (9) and said PCB (7) mounted on said plastic cover (5).
[0040] Said sensors (8) are used to measure the tank temperature and correlate with water temperature to on and off the power supply to said PCB (7) to get the 10 desired water temp. A Safety Thermal Sensor (8a) is used to switch off the power supply if the safety temperature of water tank is reaching to a particular level. Functioning of the induction water heater is shown by block diagram in figure 3.
[0041] Ref. to Fig. 3, When the input power supply to said PCB (7) via said Temp Sensor (8) and said Safety Thermal Sensors (8a) mounted on Tank (2), said PCB
15 (7) converts the standard applied current into high frequency current at higher voltage and send the current to said Coil (6). When current flows into said coil (6), it starts inducing the eddy currents into said Tank (2). With the help of eddy current, heat is getting generated into tank Wall and heat transfers to Water inside said tank (2), thus water get heat up. A Coupling (10) is the optimized distance
20 between said coil (6) and said tank (2), which is achieved after mounting said coil (6) with a plastic frame (13) on the tank (2).
[0042] From PCB (7), one dc voltage will be given to display and said fan (9). Said fan (9) is used to cool said coil (6) and said PCB (7) to keep these into their safe operational limit.
25 [0043] As shown in figure 4 and 5, uniform gap and optimized coupling (10) is achieved with proper magnetic field (11) by the generation of eddy current (12) in tank (2). By the use of curved coil (6) attached to soft ferrite (13) uniform distance between tank (2) and coil (6) is maintained for uniform heating of tank (2) and less heat loss.
10

[0044] Advantages of the invention-1. Faster localized water heating, significantly up to 45°C similar to instant
water heater
2. Heating time reduction
5 3. No heating element
4. No scale formation inside the water heater, since there is no heating element inside the body of the water heater
5. Uniform heating for long duration as no scaling on heating mechanism
6. No need for separate thermostat
10 7. Ease of serviceability
[0045] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily
15 utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various assembly that, although not explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited
20 herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the
25 present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0046] These and other advantages of the present subject matter would be 30 described in greater detail with reference to the following figures. It should be
11

noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
5 [0047] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures
10 depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the
15 above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited
20 feature.
[0048] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present 25 subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

Claims:WE CLAIM:

1.An induction water heater (100) comprising:
an induction heating unit (100a) installed on water heater body (1);
said induction heating unit (100a) is installed on any side selected from left side, right side or front side of a metal tank (2);
an outlet pipe (3); and
an inlet pipe (4)
characterized in that said induction heating unit (100a) comprises a plastic cover (5), a curved coil (6) for uniform gap and optimized coupling with said tank (2), a PCB (7), sensors (8) and a cooling fan (9) to cool said coil (6) and said PCB (7).

2. The induction water heater (100) as claimed in claim 1, wherein said coil(6) is curved according to the shape of said heating tank (2) for providing optimized coupling with said tank (2) and optimized heating of said tank (2).

3. The induction water heater (100) as claimed in claim 1, wherein said plastic cover (5) mounts said PCB (7) and said cooling fan (9) for cooling of said PCB (7) and said coil (6) simultaneously and providing optimized air flow to have proper functioning of said coil (6) and said PCB (7).

4. The induction water heater (100) as claimed in claim 1, wherein said coil (6) and said PCB (7) are mounted in such a way that both are cooled together by said cooling fan (9).

5. The induction water heater (100) as claimed in claim 1, wherein uniform gap and optimized coupling (10) is achieved with proper magnetic field by the generation of eddy current said tank (2) by the use of said coil (6) to maintain uniform heating of said tank (2).

6. The induction water heater (100) as claimed in claim 1, wherein said coil is made from copper.
, Description:FIELD OF INVENTION:
[001] The present invention generally relates to home appliances. The present invention more particularly relates to an induction water heater having optimal number of heating coils for optimal heating of water and power consumption.
BACKGROUND AND PRIOR ART:
[002] Water heaters have been around for many years as a device for water heating for domestic purpose. The popular heating technology over the years is a resistive heating (Heating Element/ Calrod) that heat the water. Many of the water heaters have problems such as scaling on the heating elements, different power consumption over the age of product i.e. non-uniform heating during product life, Bubbles in the water and noise during use.
[003] Recent advancement in heating technology is heating by induction. Various methods have been adopted to improve the water heating technology by providing electro-magnetic induction water heating. Reference may be made to the following:-
[004] Publication No. CN202328804 (D1) discloses a variable-frequency water heater, which comprises a shell body and a water heating tank, wherein the water heating tank is fixedly arranged in the shell body, and a water inlet pipe and a water outlet pipe are connected onto the water heating tank. The variable-frequency water heater is characterized in that: a definite number of electromagnetic induction heating coils are sleeved on the external surface of the water heating tank; the water heating tank is provided with a temperature control sensor; and a control panel for controlling the electromagnetic induction heating coils and the temperature control sensor is fixedly arranged in the shell body.
[005] Indian Publication No. 201627004225 (D2) discloses water heater comprising a tank for holding water the tank being delimited by a peripheral jacket and the wall of a leak tight sheath that dips into the internal volume of the peripheral jacket and an electric heating device characterized in that the heating device comprises at least one inductor housed in the sheath and at least one filler formed by at least a part of the wall of the sheath. The technical effect, induced by the use of a sheath comprising at least one inductor, is that of generating currents induced directly in the sheath and thus promoting a more rapid heating effect.
[006] Indian Publication No. 2118/DEL/2015 (D3) relates to a field of harmonic electric water heater, power supply equipment and heating method thereof. The water heater or geyser comprises of a harmonic generator generating a harmonic supply by •means of a oscillator circuit which is producing an output of standard 220 V with a frequency of 150 Hz. The plurality of heating plates connected lu the oscillator circuit by means of a transformer consisting of a primary winding having a predetermined number of turns and a secondary winding having a predetermined number of turns, the secondary winding being electrically conductive, wherein current is supplied to the primary winding of the heating unit by the oscillator circuit, creating an electro-magnetic field around the primary winding that couples• with the secondary winding, thereby inducing high frequency current in the secondary winding and heating the secondary winding and the water flowing through the heating plates.
[007] Publication No. CN205919501 (D4) discloses magnetic eddy current heater forever relating to a permanent magnetism heater, and external rotor permanent -magnet machine stator module comprise stator core, coil, and stator module connects the pressure equipment on stator axle, permanent magnet yoke inner wall is through sticky a week motor permanent magnet, the outer wall is with sticky water heater permanent magnet, external rotor permanent-magnet machine front end housing, motor rear end cap centre bore stud with bearing, bearing inner diameter and stator axle pressure equipment, external rotor permanent-magnet machine front end housing, motor rear end cap end are continued to use the bolt and are connected with yoke, the water heater body spiral copper pipe is fixed on heater shell through the foamer, water heater rear end cap is passed through the key-type connection with water heater front end housing centre bore and is fixed with stator axle.
[008] Publication No. CN105444418 (D5) discloses a safety shield applied onto an electric water heater. The safety shield comprises a casing, a base, a container and an electromagnetic induction heater, wherein the electromagnetic induction heater comprises an electromagnetic induction coil and an eddy current heating element arranged in an electromagnetic induction coil alternating magnetic field. A circuit board and a cooling fan are arranged in the base, and cooling holes are formed in the lateral wall of the base and covered with a splash-proof petticoat.
[009] Publication No. CN201429207 (D6) discloses a wall-mounted boiler device with the function of electromagnetic eddy-current heating. The wall-mounted boiler device consists of a box body, an electromagnetic eddy-current heating device, an expansion tank, a circuit control plate, a function display panel, a three-way electromagnetic control valve, a circulating pump, a heat exchanger, a tap water make-up pipe, a warming-use water return pipe, a bathing-use hot water pipe, and a warming-use water outlet pipe, which are connected with each other. The utility model relies on the electromagnetic eddy-current heating device in heating to realize the complete water-electricity separation in the electric water heater.
[0010] Publication No. CN2208198 (D6) discloses a novel electromagnetic water heater. A metal heater is arranged in a heat change water tank which is provided with a water inlet and a water outlet, and an eddy current coil curl which is connected with the generator of a high frequency power source is surrounded at the outside of the wall of the water tank in an insulating way.
[0011] Publication No. CN2440180 (D7) discloses an induction type heating energy-saving device used for electric water-heating boilers and domestic water heaters, which adopts an induction heating mode of parallel resonance; the utility model is composed of an induction winding, an induction heater of eddy current, a capacitor bank and a voltage regulating element. The induction winding and a capacitor are formed into a parallel resonance circuit; the induction heater of eddy current is installed on the inner side of a barrel-arranged water container of an electric water-heating boiler or a domestic electric water heater in packs to form a heating element of eddy current with a barrel wall.
[0012] Publication No. CN106304448 (D8) discloses an electromagnetic induction-type water heater heating rod, which is composed of an insulated shell, a coil disc, a flange disc, metal plates, fixing seats, and a metal heat conduction pipe, wherein the coil disc is placed in the insulated shell; metal plates are arranged outside the insulated shell; and the metal plate is parallel with the corresponding bottom surface of the insulated shell. The electromagnetic induction-type water heater heating rod of the invention is arranged in a water heater water tank; when high-frequency AC passes through the coil of the coil disc, an AC magnetic field is generated; when magnetic lines of force in the magnetic field arrive at the metal plate, eddy current is generated on the surface of the metal plate, and the metal plate is heated; water flowing through a space layer is magnetized.
[0013] Publication No. CN202562006 (D9) discloses an induction heating coil for an instant electromagnetic water heater comprising an outer cylinder, an inner cylinder and a connecting pipe, wherein the outer cylinder is arranged outside the inner cylinder; the end part of the inner cylinder exceeds the end part of the outer cylinder; the outer cylinder and the inner cylinder are communicated with each other through the connecting pipe; a water inlet joint is arranged on the outer cylinder; a water outlet joint is arranged on the inner cylinder; a baffle is arranged at the end part of the outer cylinder; a through hole is formed on the baffle close to the inner cylinder; a high-temperature insulating layer is arranged outside the inner cylinder; a high-temperature insulated wire is arranged in the high-temperature insulating layer; and the high-temperature insulated wire penetrates through the through hole. An annular magnetic circuit is formed between the inner cylinder and the outer cylinder, the electromagnetic radiation generated in the work is shielded by the outer cylinder, and the heat generated by the electromagnetic radiation on the outer cylinder due to the eddy current is taken away by the flowing-through cold water out flowing from the inner cylinder.
[0014] Publication No. CN201897309 (D10) discloses an electromagnetic water heater used for bathing. A heating wire coil is arranged below an iron water storage tank, a circuit board is arranged below the heating wire coil, an electronic element is arranged on the circuit board, and a power plug and a button switch are arranged at the side of the water heater.
[0015] Publication No. CN201628361 (D11) discloses a double-side electromagnetic induction type electric water heater, which comprises a casing, a water inlet pipe and a water outlet pipe, wherein an electromagnetic induction coil is arranged in the casing, tubular iron heaters are arranged on two sides of the electromagnetic induction coil, and the tubular iron heater on one side is connected with the water inlet pipe while the tubular iron heater on the other side is connected with the water outlet.
[0016] Publication No. CN201121976 (D12) discloses an electromagnetic instantaneous electric water heater, characterized in that the electromagnetic induction heating wire coil bracket and the wire coil are fixed inside the shell body, the fire resistant panel is fixed on the electromagnetic induction heating wire coil, the iron micro-thermal liner is installed on a tray inside the shell body, the iron micro-thermal liner is fastened via a locating knob inside the shell body and then is contacted with the fire resistant panel, the iron micro-thermal liner is in threaded connection with a micro-thermal liner cover via a high temperature sealing ring, and a thermal liner cover is provided with a water inlet tap and a water outlet tap.
[0017] Publication No. CN1566856 (D13) discloses an electromagnetic water heater adopting electromagnetic induction heating technology.
[0018] Publication No. CN202719745 (D14) discloses a rapid heating energy-saving heater of an electric water heater wherein an electromagnetic induction coil and a high-frequency generation control unit for controlling the electromagnetic induction coil are arranged below the heating tank; an isolating plate is arranged between the electromagnetic induction coil and the heating tank; and the electromagnetic induction coil and the isolating plate are fixedly arranged on a fixed bracket.
[0019] Indian Publication No. 518/MUMNP/2015 (D15) discloses a device for the induction heating of a water heater and a water heater provided with such a device. The water heater is characterised in that the heating means comprise a power generator and an inductive module formed from at least one inductor and at least one load the inductor being configured to generate a current induced in the load the inductor and at least one load being submerged in the volume of water to be heated.
[0020] Thus in view of the above prior arts, induction water heating technology provides the fastest and uniform heating with overall less power consumption annually as this technology is superior to the existing resistive heating technology in which heating efficiency reduces with the time of usage and different level of water TDS level.
[0021] Hence, the present invention aims to provide an improved induction water heater (geyser) to have water heating in tank in place of resistive heating for providing better heating efficiency with less power consumption (uniform power consumption and heating efficiency for complete geyser life) and removing heating element which is getting failed due to salt deposition on it.
OBJECTS OF THE INVENTION:
[0022] The principal objective of the present invention is to provide an induction water heater having optimized heating coils for optimized heating of water.
[0023] Another object of the present invention is to provide heating of water via tank heating by the means of Inductive heating.
[0024] Yet another object of the present invention is to reduce the power consumption of the water heater.
[0025] Still another object of the present invention is increase the life of the water heater.
[0026] Still another object of the present invention is to provide fastest way of water heating in initial temp rise upto 55°C.

SUMMARY OF THE INVENTION:
[0027] In accordance with the said objectives, the present invention provides an induction water heater having optimized heating coils for optimized heating of water. The induction heating unit is installed on the water heater body on any side selected from left side, right side or front side of the metal tank. The water heater has outlet pipe and inlet pipe. The induction heating unit has a plastic cover, curved coil, PCB, sensors and a cooling fan to cool coil and PCB simultaneously. Present induction water heater is provided to heat the water in a wall mounted water tank heater, in place of heating the water using a heating rod/element in the water tank with lower Watt density, by creating the heat in the tank wall by the means of electromagnetic induction and eddy current generation.

BRIEF DESCRIPTION OF THE DRAWINGS
[0028] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0029] Figure 1discloses the inner structure and components of the induction water heater according to the present invention;
[0030] Figures 2(a) and 2(b) show fan and PCB mounted on plastic cover;
[0031] Figure 3 shows the block diagram for the functioning of the induction water heater;
[0032] Figures 4 & 6 show gap and optimized coupling between curved coil and tank of the water heater.
[0033] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0034] The present invention will be described in detail below with reference to an embodiment as shown in the drawing.
[0035] Accordingly the present invention provides an induction water heater (100) having optimized heating coils for optimized heating of water. This heating is achieved by heating the water storage tank by generating the eddy current in the tank body.
[0036] Figure 1 shows the inner structure and components of said induction water heater (100) with an induction heating unit (100a) according to the present invention. Said induction heating unit (100a) is installed on the body (1) of said water heater (100) on any side selected from left side, right side or front side of a metal tank (2). Said water heater (100) has an outlet pipe (3) and an inlet pipe (4). Cold water enters said induction water heater from said inlet pipe (4) and after heating, the hot water comes out from said outlet pipe (3).
[0037] Said induction heating unit (100a) has a plastic cover (5), a curved coil (6), a PCB (7), sensors (8) and a cooling fan (9) to cool said curved coil (6) and said PCB (7) simultaneously.
[0038] Novel curved coils (6), according to the present invention, provide optimized heating to tank and optimized coupling between coil and tank. Said PCB (7) and said cooling fan (9) are mounted on said plastic cover (5). Said cooling fan (9) in addition to cooling of said PCB (7) and said coil (6), also provides optimized air flow to have proper functioning of said coil (6) and said PCB (7). Said Coil (6) and said PCB (7) are mounted in such a way that both are cooled together by said cooling fan (9).
[0039] Figure 2(a) and 2(b) show said fan (9) and said PCB (7) mounted on said plastic cover (5).
[0040] Said sensors (8) are used to measure the tank temperature and correlate with water temperature to on and off the power supply to said PCB (7) to get the desired water temp. A Safety Thermal Sensor (8a) is used to switch off the power supply if the safety temperature of water tank is reaching to a particular level. Functioning of the induction water heater is shown by block diagram in figure 3.
[0041] Ref. to Fig. 3, When the input power supply to said PCB (7) via said Temp Sensor (8) and said Safety Thermal Sensors (8a) mounted on Tank (2), said PCB (7) converts the standard applied current into high frequency current at higher voltage and send the current to said Coil (6). When current flows into said coil (6), it starts inducing the eddy currents into said Tank (2). With the help of eddy current, heat is getting generated into tank Wall and heat transfers to Water inside said tank (2), thus water get heat up. A Coupling (10) is the optimized distance between said coil (6) and said tank (2), which is achieved after mounting said coil (6) with a plastic frame (13) on the tank (2).
[0042] From PCB (7), one dc voltage will be given to display and said fan (9). Said fan (9) is used to cool said coil (6) and said PCB (7) to keep these into their safe operational limit.
[0043] As shown in figure 4 and 5, uniform gap and optimized coupling (10) is achieved with proper magnetic field (11) by the generation of eddy current (12) in tank (2). By the use of curved coil (6) attached to soft ferrite (13) uniform distance between tank (2) and coil (6) is maintained for uniform heating of tank (2) and less heat loss.
[0044] Advantages of the invention-
1. Faster localized water heating, significantly up to 45°C similar to instant water heater
2. Heating time reduction
3. No heating element
4. No scale formation inside the water heater, since there is no heating element inside the body of the water heater
5. Uniform heating for long duration as no scaling on heating mechanism
6. No need for separate thermostat
7. Ease of serviceability

[0045] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various assembly that, although not explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0046] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
[0047] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited feature.
[0048] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.