Abstract: A plurality of hollow condensation units 6 are coaxially connected. Compressed air is caused to move in sequence from the upstream side condensation units 6 into the downstream side condensation units 6 to be dehumidified. Dehumidified compressed air can be supplied to a downstream side air tool 24. Collision plates 15, 16 capable of colliding with compressed air are provided inside each condensation unit 6. Compressed air is provided to be condensable and dehumidified compressed air is provided to be capable of moving in sequence into the downstream side condensation units 6.

Abstract: A concentrating apparatus for concentrating compressed air includes a first hollow cylindrical concentrating unit which is adapted to cause compressed air to: (i) collide with an upstream side of a collision plate so as to be concentrated and partially liquefied; (ii) move to an annular passage and be jetted into an air moving chamber so as to be adiabatically expanded and partially liquefied; (iii) be compressed in an air compressing passage and pushed out so as to retreat along a conical partition wall; (iv) collide with a downstream side of the collision plate so as to be concentrated and partially liquefied; (v) be introduced into an upstream end of an outlet tube; and (vi) move to a downstream end of the outlet tube and into a second hollow cylindrical concentrating unit.