Hitachi-Ge Nuclear Energy, Ltd.

Hisaka Works, Ltd.

Kiyoshi Ishihama

Seiichi Matsumura

Mana Iwaki

Isamu Hiwatashi

Kenji Kusunoki

Funabiki Takahisa

Yukiko Kushima

Takahisa Funabiki

Provided is a plate heat exchanger that includes a plurality of heat transfer plates stacked to each other, a gasket interposed between each adjacent heat transfer plates, and a regulating member formed to be able to support at least partially the gasket. Each heat transfer plate has a fitting recessed portion formed in recessed manner on the side on which the gasket fitting groove is formed. The fitting recessed portion crosses the recessed strip while extending along the gasket fitting groove. The support part is arranged along the gasket fitting groove when the regulating member is held in fitting engagement with the fitting recessed portion. The support part is arranged along the gasket fitting groove when the regulating member is held in fitting engagement with the fitting recessed portion.

Plate heat exchanger

To provide a plate heat exchanger free from degradation of gaskets which form a flow path through which a high-temperature fluid flows. In the plate heat exchanger, a plurality of heat transfer plateseach provided with passage holes, andin corners are stacked; a flow-path forming gasketis interposed between peripheries of each adjacent ones of the heat transfer plates; communicating-path forming gasketsare installed, surrounding the passage holesin each adjacent ones of the heat transfer platesalternately; and thereby a first flow pathadapted to pass a high-temperature fluid H, a second flow path adapted to pass a low-temperature fluid C, and communicating pathsadapted to cause the high-temperature fluid H and the low-temperature fluid C, respectively, to flow in and out of the first flow pathand the second flow pathare formed alternately on opposite sides of each of the heat transfer plates. The flow-path forming gasketis made up of an inner gasket memberand an outer gasket memberarranged in two parallel lines.

A flow-path forming gasket is interposed between peripheries of each adjacent ones of stacked heat transfer plates; communicating-path forming gaskets are each installed, surrounding the passage holes in each adjacent ones of the heat transfer plates alternately; and thereby a first flow path adapted to pass a high-temperature fluid, a second flow path adapted to pass a low-temperature fluid, and communicating paths adapted to cause the fluids, respectively, to flow in and out of the first and second flow paths are formed alternately on opposite sides of each heat transfer plate. A drain hole is formed in each of the heat transfer plates to discharge fluid leaking from the first flow path, the second flow path, or the communicating path. The drain hole is surrounded by gaskets isolated from the first flow path, the second flow path, or the communicating path. A leakage flow path or a leakage collector is formed by the gaskets.

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Hitachi, Japan

Kiyoshi Ishihama