Heating device for electric water heater

Abstract

A heating device for an electric water heater, especially a heating device that can effectively recover waste heat, the device includes a secondary water box provided on one of the top and the bottom sides of a flat type main water box, the secondary water box is communicated with the main water box to guide water of the secondary water box into the main water box; the main and the secondary water boxes are provided therebetween with a laminate electric heating board of which the top and the bottom sides are clung respectively to the secondary water box and the main water box, an effect of preheating the water in the secondary water box is obtained to thereby effectively use the waste heat for saving energy source, and heating efficiency can be increased.

1 . A heating device for an electric water heater comprising:
 a main water box having at least a heat conducting surface, and having on two ends of said main water box respectively a water inlet port and a hot water supplying port;   a secondary water box provided on one of a top side and a bottom side of said main water box, having a heat receiving surface, a water intake port and a water discharging port, said water discharging port is communicated with said water inlet port to guide water of said secondary water box into said main water box; and   an electric heating board provided between said main water box and said secondary water box, a top side and a bottom side of said electric heating board are clung respectively to a heat receiving surface of said secondary water box and a heat conducting surface of said main water box, when one side of said top and bottom sides of said electric heating board heats water in said main water box via said heat conducting surface, remaining heat induced on other side of said top and bottom sides is conducted via said heat receiving surface to said secondary water box; said main water box, said electric heating board and said secondary water box are piled to form an integral unit.   
     
     
         2 . The heating device for an electric water heater as in  claim 1 , wherein said main water box is provided therein with a reciprocating revolving water channel communicated in-between said water inlet port and said hot water supplying port. 
     
     
         3 . The heating device for an electric water heater as in  claim 2 , wherein said main water box has therein a plurality of parallelly spaced and alternately arranged heat conducting boards, hence said water channel is formed among said heat conducting boards. 
     
     
         4 . The heating device for an electric water heater as in  claim 3 , wherein said heat conducting boards are made of high heat conducting metals. 
     
     
         5 . The heating device for an electric water heater as in  claim 3 , wherein said heat conducting boards are sealed and stored therein with materials for super conductors. 
     
     
         6 . The heating device for an electric water heater as in  claim 1 , wherein said electric heating boards are made of micro crystal glass material, and are provided thereon each with an electric heating element, 
     
     
         7 . The heating device for an electric water heater as in  claim 1 , wherein said electric heating boards are made of the materials of steel or aluminum, and are provided each with an electric heating element. 
     
     
         8 . The heating device for an electric water heater as in  claim 1 , wherein said electric heating boards are provided thereon each with a reciprocating revolving electric heating element. 
     
     
         9 . The heating device for an electric water heater as in  claim 1 , wherein volume of said secondary water box is smaller than that of said main water box, and said secondary water box is provided therein with a laminate water channel communicated in-between said intake port and said water discharging port. 
     
     
         10 . A heating device for an electric water heater comprising:
 a main water box having a first heat conducting surface and a second heat conducting surface on its top and bottom sides respectively, and having on its two ends respectively a water inlet port and a hot water supplying port;   a first secondary water box provided on a bottom side of said main water box, having a first heat receiving surface, and having on its two ends respectively a first water intake port and a first water discharging port;   a second secondary water box provided on a bottom side of said main water box, having a second heat receiving surface, and having on its two ends respectively a second water intake port and a second water discharging port, said first water discharging port is communicated with said second water intake port, while said second water discharging port is communicated with said water inlet port to guide water of said first secondary water box into said main water box;   a first electric heating board provided between said main water box and said first secondary water box, its top and bottom sides are clung respectively to a first heat receiving surface of said first secondary water box and said first heat conducting surface of said main water box, when a top side of said first electric heating board heats water in said main water box via said first heat conducting surface, remaining heat induced on a bottom side of said first electric heating board is conducted via said first heat receiving surface to said first secondary water box; and   a second electric heating board provided between said main water box and said second secondary water box, its top and bottom sides are clung respectively to said second heat receiving surface of said second secondary water box and said second heat conducting surface of said main water box, when a top side of said second electric heating board heats water in said main water box via said second heat conducting surface, remaining heat induced on a top side of said second electric heating board is conducted via said second heat receiving surface to said second secondary water box; said first secondary water box, said first electric heating board, said main water box, said second electric heating board and said second secondary water box are piled to form an integral unit.   
     
     
         11 . The heating device for an electric water heater as in  claim 10 , wherein said main water box is provided therein with a reciprocating revolving water channel communicated in-between said water inlet port and said hot water supplying port. 
     
     
         12 . The heating device for an electric water heater as in  claim 11 , wherein said main water box has therein a plurality of parallelly spaced and alternately arranged heat conducting boards, hence said water channel is formed among said heat conducting boards. 
     
     
         13 . The heating device for an electric water heater as in  claim 12 , wherein said heat conducting boards are made of high heat conducting metals. 
     
     
         14 . The heating device for an electric water heater as in  claim 12 , wherein said heat conducting boards are sealed and stored therein with materials for super conductors. 
     
     
         15 . The heating device for an electric water heater as in  claim 10 , wherein said electric heating boards are made of micro crystal glass material, and are provided thereon each with an electric heating element, 
     
     
         16 . The heating device for an electric water heater as in  claim 10 , wherein said electric heating boards are made of the materials of steel or aluminum, and are provided thereon each with an electric heating element. 
     
     
         17 . The heating device for an electric water heater as in  claim 10 , wherein said first and second electric heating boards are provided thereon each with a reciprocating revolving electric heating element, 
     
     
         18 . The heating device for an electric water heater as in  claim 10 , wherein volume of said secondary water box is smaller than that of said main water box, said first secondary water box is provided therein with a laminate water channel communicated in-between said first intake port and said first water discharging port, and said second secondary water box is provided therein with a laminate water channel communicated in-between said second intake port and said second water discharging port.