| 摘要 |
<p>The invention relates to an internal bladder of an overlapping type electric water heater, which comprises a steel case, an internal bladder made of silicone rubber, and an electric heater in the internal bladder The shape of the internal bladder corresponds to the shape of inner surface of the steel case. The internal bladder is provided in the steel case. One end of the electric heater is hermetically fixed on a steel flange. The leading end of the steel flange is hermetically covered on the seal of the steel case. Thus the steel case is able to endure high pressure. The internal bladder made of silicone rubber is heat-resistant and useful for prevention of corrosion. The steel case is not liable to be corroded because the steel case does not contact with water.</p> |
