ADAPTER Russian patent published in 2011 - IPC F28D7/10 

FIELD: heating.

SUBSTANCE: invention relates to the field of thermotechnics and can be used in adapters of heat exchange element of type "pipe in pipe" when changing the hydraulic circuit of movement of heat-exchanging fluids of in the heat exchanger of nuclear power plant (NPP), working on liquid-metal coolant in the mode of variable current sinks. In the adapter containing overflow gaps, axial, radial and circle canals, edges for sealing pipe joints, and forming with the last a heat exchanger element of type "pipe in pipe", the adapter edges are connected with one side to the inner and outer tubes back to back, at that the edge for connecting the inner tube is removed from the adapter relative to the edge to connect the outer pipe so that it forms a chamber transmitted with a tube cavity which is connected back to back to the edge of the adapter on the other side, using the equidistant located overflow gaps, and the radial channels are made flat with a width equal to the diametre of axial channel for connecting the inner tube, and are extended along the axis of the adapter, and are made with an inclination to its axis, and the inner tube cavity through the axial channel of the adapter communicates with the radial ones.

EFFECT: design of the adapter of the proposed type enables to increase reliability of the heat exchanger element of type "pipe in pipe" on a site of the phase transition of the heated medium due to changing the hydraulic circuit of heat transfer and, therefore, to exclude critical values of thermal cycling stresses.

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