Treatment device for treating fluids, in particular liquid fluids, and treatment element of treatment device

A treatment device (10) for filtering fluids comprising:

• a treatment element (14) comprising:
• a filter bellows (66) of a filter medium;
• a housing (56) comprising:
• a housing pot (58) having a peripheral outer wall surrounding a connecting axis of the treatment element, the housing pot (58) is open end at a first axial end of the housing pot;
• wherein the filter bellows (66) is arranged in an interior of the housing pot (58);
• a housing cover (60) permanently fixed onto the housing pot (58) at the open end of the housing pot, the housing cover (60) retaining the filter bellows (66) within the interior of the housing pot (58);
• at least one inlet (88) for the fluid to be treated;
• and
• at least one outlet (82) for the treated fluid;
• a releasable bayonet-type connecting device (34) having a housing connecting part (100) arranged at the open end of the housing pot (58), the connecting device configured to interact with at least one head connecting part (32) of a connecting head (12) for the purpose of connecting the connecting device (34);
• wherein the treatment element (14) is connected to the connecting head (12) of the treatment device (10) by means of the releasable bayonet-type connecting device (34) through the execution of a rotational/plug-in movement about the connecting axis (20) of the treatment device (10);
• the connecting head (12) comprising:
• at least one feed (16) for the fluid to be treated, said feed being connectable to the at least one inlet (88), and/or at least one discharge (18) for the treated fluid, said discharge being connectable to the at least one outlet (82);
• wherein the connecting head (12) and the treatment element (14) are connected to each other by means of the releasable bayonet-type connecting device (34) through the execution of a rotational/plug-in movement about the connecting axis (20) of the treatment device (10);
• and
• wherein at least one head second connecting part (32) has at least one counter functional surface (44) that engages one of the functional surfaces (106) of the connecting part (100) from behind;
• wherein the material thickness of the housing connecting part (100) is constant at least in the region of the at least one functional surface (106, 108);
• wherein the housing connecting part (100) is arranged axially between an axial outer surface of the housing cover (60) and the first axial end of the housing pot (58), the housing connecting part having:
• a radial outer portion of the housing connecting part (100) forming a housing mount section (102) that rests against the axial outer surface of the housing cover (60), the housing mounting section arranged in the interior of the peripheral outer wall of the housing pot (58);
• a radial inner portion of the housing connecting part (100) forming a plurality of housing-side bayonet sections (104) which project radially inwardly from the housing mount section (102), the housing-side bayonet sections (104) are spaced apart circumferentially about the connecting axis (20);
• wherein each of the plurality of housing-side bayonet sections (104), in a circumferential direction, rise axially outwardly away from the housing cover (60) towards a circumferential end of the plurality of housing-side bayonet sections (104);
• and
• each of the plurality of housing-side bayonet sections (104) having, on axially opposite sides, an inner functional surface (106) and an outer functional surface (108), the inner or outer functional surfaces extending helically about the connecting axis (20), the plurality of housing-side bayonet sections (104) spaced circumferentially apart from each other;
• and
• a sealing ring (96) arranged on the housing cover (60) and spaced radially inwardly away from the housing connecting part (100), for sealing a fluid-carrying region of the treatment device to an outside environment.