Rotary feed-through with leakage sensor

A rotary feed-through for supplying fluid to a rotating machine part comprising:

• a hollow shaft (3) that is rotatably supported in a housing (1, 2) and has a first sliding surface (29);
• a sealing bushing (31) that is arranged in a rotationally fixed fashion within the housing (1, 2) coaxial to the hollow shaft (3);
• a second sliding surface (30) for contacting the first sliding surface (29);
• a collecting chamber (27) that is arranged within the housing (1, 2) and configured for collecting leakage fluid escaping between the two sliding surfaces (29, 30);
• a detection channel (26, 33, 34, 37, 39, 47) arranged within the housing (1, 2) and connected to the collecting chamber (27), the detection channel (26, 33, 34, 37, 39, 47) including an inner leakage channel (26, 33, 34, 47) extending along the hollow shaft (3) and at least one outer leakage channel (37, 39) radially offset relative to the inner leakage channel;
• and
• a leakage sensor (41) connected to the detection channel (26, 33, 34, 37, 39, 47);
• wherein the outer leakage channel (37, 39) is formed by at least one coaxial bore (37) that extends parallel to the hollow shaft (3) in a front housing part (1) and by a receptacle bore (39) in a rear housing part (2) of the housing (1, 2) that is connected to the axial bore (37).