Plate heat exchanger with improved connection strength

A plate heat exchanger, comprising:

• a plurality of plates stacked along a thickness direction of the plate heat exchanger;
• the plurality of plates comprising a plurality of first heat exchange plates and a plurality of second heat exchange plates;
• the first heat exchange plate and the second heat exchange plate being disposed alternately along the thickness direction of the plate heat exchanger;
• wherein the plate heat exchanger has a first inter-plate channel configured to circulate a refrigerant and a second inter-plate channel configured to circulate a heat exchange medium;
• the first inter-plate channel is not in fluid communication with the second inter-plate channel;
• the first inter-plate channel is located between a front surface of a corresponding second heat exchange plate and a corresponding first heat exchange plate disposed adjacent to the corresponding second heat exchange plate along the thickness direction of the plate heat exchanger;
• the second inter-plate channel is located between a back surface of the corresponding second heat exchange plate and another corresponding first heat exchange plate disposed adjacent to the corresponding second heat exchange plate along the thickness direction of the plate heat exchanger;
• each first heat exchange plate and each second heat exchange plate have first corner holes corresponding with each other and communicating with the first inter-plate channel;
• the first heat exchange plate has a first flat joint portion in which the first corner hole of the first heat exchange plate is located;
• the second heat exchange plate has a second flat joint portion in which the first corner hole of the second heat exchange plate is located;
• a front surface of the second flat joint portion is at least partially spaced from an adjacent first flat joint portion;
• a back surface of the second flat joint portion is at least partially connected to another adjacent first flat joint portion;
• each first heat exchange plate and each second heat exchange plate have second corner holes corresponding with each other and communicating with the first inter-plate channel;
• the plate heat exchanger comprises a plurality of connection blocks which are independent components before being assembled and connected to the plurality of first heat exchange plates and the plurality of second heat exchange plates;
• each connection block connects the front surface of the second flat joint portion and the adjacent first flat joint portion;
• wherein the plate heat exchanger has a flange, and the flange comprises a first side and a second side;
• wherein the first heat exchange plate and the second heat exchange plate have third corner holes corresponding with each other and communicating with the second inter-plate channel;
• the first heat exchange plate and the second heat exchange plate have fourth corner holes corresponding with each other and communicating with the second inter-plate channel;
• wherein the first corner hole and the second corner hole are distributed diagonally;
• the third corner hole and the fourth corner hole are distributed diagonally;
• the first heat exchange plate comprises a third flat joint portion located on a peripheral side of the fourth corner hole of the first heat exchange plate;
• the second heat exchange plate comprises a fourth flat joint portion located on a peripheral side of the fourth corner hole of the second heat exchange plate;
• the plate heat exchanger comprises a first blocking portion located at a corner of the second inter-plate channel on the peripheral side of the fourth corner hole;
• the first blocking portion comprises a first protrusion which is provided on at least one of the third flat joint portion and the fourth flat joint portion;
• the first protrusion protrudes toward the second inter-plate channel;
• the first heat exchange plate comprises a fifth flat joint portion located on a peripheral side of the third corner hole of the first heat exchange plate;
• the second heat exchange plate comprises a sixth flat joint portion located on the peripheral side of the third corner hole of the second heat exchange plate;
• the plate heat exchanger comprises a second blocking portion located at a corner of the second inter-plate channel on the peripheral side of the third corner hole;
• the second blocking portion comprises a second protrusion which is provided on at least one of the fifth flat joint portion and the sixth flat joint portion;
• the second protrusion protrudes toward the second inter-plate channel;
• the third corner hole and the first corner hole are distributed along a length direction of the second side.