Storage electric water heater

Abstract

A storage electric water heater includes a tank, an inlet tube, an outlet tube, an isolating member, and a heating device, wherein the tank has a storing space. The inlet tube and the outlet tube are disposed in the tank. The isolating member is disposed in the storing space to divide the storing space into a first chamber and a second chamber. The first chamber communicates with the inlet tube and the outlet tube. The heating device is disposed in the second chamber and includes a tube body and a heating element. Two ends of the tube body communicate with the first chamber, so that water in the first chamber could enter an interior of the tube body. The heating element is disposed on a tube wall of the tube body. Thermal energy generated by the heating element could be transferred to the interior of the tube body via the tube wall to heat up water in the tube body, thereby facilitating the thermal convection of water in the first chamber.

What is claimed is: 
     
         1 . A storage electric water heater, comprising:
 a tank having a storing space;   an inlet tube and an outlet tube respectively disposed in the tank;   an isolating member disposed in the tank and located in the storing space to divide the storing space into a first chamber and a second chamber; the first chamber communicates with the inlet tube and the outlet tube and is adapted to store water; and   a heating device disposed in the second chamber and comprises a tube body and a heating element; the tube body has a first end and a second end which respectively communicate with the first chamber, so that water in the first chamber is able to flow into an interior of the tube body; the heating element is disposed on a tube wall of the tube body, wherein a thermal energy generated by the heating element is transferred to the interior of the tube body via the tube wall of the tube body to heat the water in the interior of the tube body.   
     
     
         2 . The storage electric water heater of  claim 1 , wherein the tube body is made by an electrically insulating material, and the heating element comprises a nano-carbon coating which is coated on the tube wall of the tube body. 
     
     
         3 . The storage electric water heater of  claim 1 , wherein a location of the second end of the tube body is higher than a location of the first end of the tube body, and the first end of the tube body is closer to the inlet tube than the second end of the tube body. 
     
     
         4 . The storage electric water heater of  claim 3 , wherein a location of the outlet tube is higher than a location of the inlet tube, and the location of the second end of the tube body is between the location of the outlet tube and the location of the inlet tube. 
     
     
         5 . The storage electric water heater of  claim 3 , wherein the first end of the tube body communicates with the first chamber via a connecting tube, and a location of an inlet end of the connecting tube is lower than a location of the inlet tube. 
     
     
         6 . The storage electric water heater of  claim 5 , wherein the connecting tube passes through a bottom portion of the tank. 
     
     
         7 . The storage electric water heater of  claim 5 , wherein the connecting tube passes through the isolating member. 
     
     
         8 . The storage electric water heater of  claim 1 , wherein the isolating member has a first surface and a second surface which face opposite directions; the first surface faces toward the first chamber, and the second surface faces toward the second chamber; an air space is disposed between the heating element and the second surface. 
     
     
         9 . The storage electric water heater of  claim 8 , wherein the thermal energy of the heating element is transferred to the first chamber via the isolating member. 
     
     
         10 . The storage electric water heater of  claim 9 , wherein the second surface of the isolating member is disposed with a thermally conductive layer which faces the heating element. 
     
     
         11 . The storage electric water heater of  claim 10 , wherein the thermally conductive layer is a nano-carbon coating. 
     
     
         12 . The storage electric water heater of  claim 1 , wherein the isolating member has a top portion and a body; a top end of the body is connected to the top portion of the isolating member, so that the top portion and the body form the second chamber; a bottom end of the body is an open-end; the bottom end of the body is connected to a bottom portion of the tank. 
     
     
         13 . The storage electric water heater of  claim 12 , wherein the bottom end of the body is disposed with an enclosing member. 
     
     
         14 . The storage electric water heater of  claim 1 , wherein the first chamber surrounds the second chamber.