Heating device and biochemical reactor having the same

A heating device comprising:

• an upper plate including an upper heating hole, at least one upper receiving hole located adjacent to the upper heating hole, and an upper conductive layer having an upper region formed on an upper surface of the upper plate and surrounding the upper receiving hole, and a receiving tube region formed on a wall of the upper receiving hole and connected to the upper region of the upper conductive layer;
• a lower plate including a lower heating hole, at least one lower receiving hole located adjacent to the lower heating hole, and a first lower conductive layer having a lower region formed on a lower surface of the lower plate and surrounding the lower receiving hole, and a receiving tube region formed on a wall of the lower receiving hole and connected to the lower region of the first lower conductive layer;
• a middle plate disposed between the upper plate and the lower plate and including a middle heating hole and at least one middle receiving hole located adjacent to the middle heating hole;
• wherein the upper heating hole, the middle heating hole and the lower heating hole are connected together to form a heating through hole, and the upper receiving hole, the middle receiving hole and the lower receiving hole are connected together to form a receiving through hole;
• and
• an electric heating element disposed in the receiving through hole and having two terminals connected electrically to the upper conductive layer and the first lower conductive layer, respectively.