Adsorption dryer for gaseous media, based on drying agent held between pistons in pressure vessel, with tongue and groove connections allowing easy assembly and maintenance

摘要

In an adsorption dryer for gaseous media, comprising a pressure vessel (6) filled with drying agent (13) in a cylindrical chamber (12), located between distributor plates (4, 5) and having pistons (14, 22) within the chamber and sealed against the chamber wall, the pistons have steps (19, 24) on the outer edges, the wall interior has annular grooves (20, 25) and tongues (21, 26) fit in the grooves and steps, as a tongue-in-groove connection, to restrict piston motion towards the adjacent distributor plates. An adsorption dryer for drying gaseous media (A) comprises at least one pressure vessel (6), which is filled with drying agent (13) and located between bottom and top distributor plates (4, 5) with linking channels and connectors for (A), and includes a cylindrical chamber (12) for the drying agent (13). Bottom and top pistons (14, 22) are supported in the chamber and sealed against the chamber wall, the support comprising a gas-permeable plate (27), itself supported on an at least one side on an the adjacent piston (22) by a compressed spring (28). The chamber (12) is connected to the linking channels in the distributor plates via lines (34, 35) sealed in the piston (14). The novel feature is that the pistons have steps (19, 24) on their annular outer edges (away from the drying agent) and the chamber wall interior has annular grooves (20, 25) opposite the steps, so that tongues (21, 26) fitting in the grooves and steps, as a tongue-in-groove connection, restrict the motion of the pistons in the directions of the adjacent distributor plates.