Abstract: A heat exchanger includes two or more heat exchanging boards each having an orifice formed by a peripheral flange, and a reinforcing device disposed between every two adjacent heat exchanging boards and having a bore aligned with the orifices of the heat exchanging boards for reinforcing the heat exchanging boards and for preventing the heat exchanging boards from being distorted or deformed, and the reinforcing device includes one or more openings communicating with the bore of the reinforcing device and communicating with a space formed between the heat exchanging boards for allowing the heat medium to flow through the spaces between the heat exchanging boards and to flow into or out of the orifices of the heat exchanging boards.

Abstract: A heat exchanger includes a number of plate sets disposed one above the other or superposed with each other, and each plate sets includes an upper plate and a lower plate for forming one or more conduits between the upper and the lower plates, and for forming one or more ducts between the lower and the upper plates of different plates, the plates include an opening communicating and coupled to the conduits for receiving one heat medium, and an orifice communicating and coupled to the ducts for receiving a different heat medium and for separating the heat media from each other, and for allowing the heat media to have different flowing quantity from each other.

Abstract: A heat exchanger includes three plates disposed one above the other or superposed with each other, for forming one or more conduits between the upper and the middle plates and for forming one or more ducts between the middle and the lower plates, and for forming one or more channels below the lower plate, the plates include an opening communicating and coupled to the conduits and the ducts for receiving a medium, and the include an orifice communicating and coupled to the channel formed below the lower plate for receiving another medium and for separating the media from each other, and for allowing the media to have different flowing quantity.