Patent ID: 8794303
Filing Date: 2014-08-05
Classification: F28D,F28F

Abstract:
1. A plate laminate type heat exchanger comprising: front and rear end plates; a plurality of pairs of flat core plates, defining a longitudinal direction and being laminated between the front and rear end plates; and high temperature fluid compartments through which high temperature fluid flows and low temperature fluid compartments through which low temperature fluid flows defined in the space surrounded by the end plates and the core plates by bonding peripheral flanges of each of the pairs of core plates to each other in a brazing process, each of the fluid compartments communicating with a pair of circulation pipes provided on the front or rear end plate in such a way that the circulation pipes jut therefrom, the plate laminate type heat exchanger wherein each of the core plates has a substantially parallelogram shape when viewed in the laminate direction, a plurality of groove-like protrusions is formed on one side of each of the flat core plates, the protrusions are disposed substantially in parallel to the longitudinal direction of the plate, a substantially circular-shaped inlet port for high temperature fluid and a substantially triangular-shaped outlet port for low temperature fluid are provided in each of the core plates on one end side in the longitudinal direction thereof, and a substantially circular-shaped outlet port for high temperature fluid and a substantially triangular-shaped inlet port for low temperature fluid are provided in each of the core plates on the other end side in the longitudinal direction thereof, the pair of the inlet port for high temperature fluid and the outlet port for high temperature fluid are disposed at each of a pair of corners whose diagonal angles are larger than those of the other pair of corners on the core plate, whereas the pair of the inlet port for low temperature fluid and the outlet port for low temperature fluid are disposed at each of the other pair of corners on the core plate, the substantially triangular-shaped inlet and outlet ports for low temperature fluid having an angle being substantially congruent with the diagonal angles of the other pair of corners, both ends of each of the protrusions converge into the inlet port for high temperature fluid and the outlet port for high temperature fluid, respectively, each of the pairs of core plates is assembled in such a way that the side of one of the two core plates that is opposite the one side faces the side of the other one of the two core plates that is opposite the one side and the protrusions formed on the respective core plates are paired but oriented in opposite directions, and the pair of core plates form a plurality of tubes surrounded by the walls of the protrusions formed on the respective core plates, the protrusions connecting the inlet port for high temperature fluid to the outlet port for high temperature fluid with substantially arcuate shapes, and one end of each of the protrusions forming the tubes is in contact with an edge of the inlet port for high temperature fluid from which the high temperature fluid flows out, the other end of each protrusion is in contact with an edge of the outlet port for high temperature which the high temperature fluid flows in, in such a way that a tube having a shorter end-to-end length has a smaller cross-sectional area in the width direction of the core plates, and the tubes form the corresponding high temperature fluid compartments, a flow path is formed on one end side in the longitudinal direction at which the inlet port for high temperature fluid is provided, such that low temperature fluid flows around an outside of the inlet port of high temperature fluid, and a flow path is formed on the other end side in the longitudinal direction at which the outlet port for high temperature fluid is provided, such that low temperature fluid flows around an outside of the outlet port of high temperature fluid.