Regenerative heat recovery unit comprising heat accumulators tiltably movable to have a valve function

Heat recovery unit comprising a casing (1) which encloses at least one regenerative heat accumulator (5), whereby the casing (1) has a supply air opening (10), an exhaust air opening (15), an exterior air opening (20) and a used-air opening (25), and whereby exhaust air and supply air alternately pass through the heat accumulator (5), characterized in that the heat accumulator (5), by means of a rotational movement, has a valve function which opens and respectively closes said openings (10-25) when the heat accumulator (5) rotates from a first position for exhaust air throughflow to a second position for exterior air throughflow, in that the heat accumulator rotates around a shaft (30), and in that the heat accumulator (5), in a direction essentially parallel with the shaft (30), has end faces (35), which in the first position cover a first pair of said openings (10-25) at the same time as a second pair of said openings (10-25) are open, and in the second position cover the second pair of openings (10-25) at the same time as the first pair of openings (10-25) are open.