| 摘要 |
The invention relates to an air dryer for compressed air systems, in particular compressed air brake systems of vehicles, which can be charged by a compressor and have at least one compressed air reservoir, comprising a housing (1) on which an inlet connection (3) to be connected to the compressor and an outlet connection (4) to be connected to the compressed air reservoir are provided. A drying cartridge (2) containing a regeneratable desiccant is accommodated in the housing (1) in such a way that during a conveying phase the compressed air to be dried flows successively through the inlet connection (3), the drying cartridge (2) and a non-return valve (5) connected upstream of the outlet connection (4) in the housing (1) and opening in the flow direction thereto, and with a pressure regulator (6) which is integrated in the housing (1) and by means of the switching pressure thereof monitors the opening and closing of a blow valve (7) connected to the inlet connection (3) and a regeneration air switching device (8), in such a way that during a regeneration phase compressed air flows off in the reverse flow direction out of the compressed air reservoir into the outlet connection (4), through the regeneration air switching device (8), the regenerating drying cartridge (2) and through the blow valve (7) via a vent (28) to the atmosphere. The regeneration air switching device (8) has an actuating element (10) which separates two chambers (21, 25) and is controllable against spring force by the pressure in at least one of the chambers (21, 25), for actuation of a valve member (12) which interacts with a valve seat (18) of a valve (12, 18) and is guided longitudinally movably in a bore (30) in the housing (1). The valve (12, 18) controls a compressed air flow connection between a compressed air channel (24) communicating with the drying cartridge (2) and another compressed air channel (20) communicating with the outlet connection (4). According to the invention the actuating element contains at least one membrane (10) and one chamber (21) of the regeneration air switching device (8) is connected via one compressed air channel (24) to the drying cartridge (2) and is also connected to the other chamber (25) via at least one non-return valve (34) which opens in the flow direction to the other chamber (25) and via at least one throttle (27). |
