FAN-HEAT EXCHANGER (MODIFICATIONS) Russian patent published in 2004 - IPC

FIELD: ventilation and air-conditioning systems, in which the heat-transfer agents are not mixed with one another. SUBSTANCE: according to the first modification, the device has a body and a two-sided impeller installed in it in the form of a separating disk, the blades of the centrifugal fan are made on the one side of the disk, and those of the centripetal fan- on the other one, which provides a counter flow heat exchange going on through the blades and the disk. The construction permits manufacture of blades of the preset curvature, in particular, such one, which ensures a constant width of the blade passage, as well as an increase both of the number of blades, and the "impeller chord-spacing ratio", which essentially enhances the heat exchange efficiency. According to the second modification, the impeller is made in the form of a separating disk, the blades of the centrifugal fan are made on the one side of the disk, and those of the centripetal turbine - on the other side, which additionally permits provision of a two-stage heat-exchange system. Both stages are installed co-axially opposite each other with the front disks of the turbines, and the discharge connections of the centrifugal fans of one stage are made communicating with the inlet connections of the turbines of the other stage. In this case the centrifugal fan of one stage injects the flow of one of the heat-transfer agents to the turbine of the other stage. In the opposite direction the transfer of the other heat-transfer agent is accomplished. EFFECT: reduced overall dimensions and mass of the device due to the fact that the front disks of the turbines of both stages are made in the form of a single disk. 23 cl, 8 dwg