High-voltage insulator

A high-voltage insulator comprising:

• a metal armature;
• an insulating tube joined to the metal armature, the insulating tube being adhesively bonded to the metal armature at an end formed as a supporting ring;
• an adhesive-bonding joint, which is disposed around an axis of the insulating tube, is delimited inwardly by a first adhesive-bonding surface arranged on the supporting ring, is delimited outwardly by a second adhesive-bonding surface arranged on the metal armature, and is filled with a hardened layer of adhesive;
• and
• an annular groove, which is formed in the metal armature and disposed around the axis of the insulating tube, the annular groove being configured to receive an end portion of the supporting ring and, in a coaxial arrangement, having two mainly axially aligned flanks, of which an outer flank of the two mainly axially aligned flanks carries the second adhesive-bonding surface,
• wherein an inner flank of the two mainly axially aligned flanks carries a first sealing surface centering the supporting ring, a second sealing surface is formed in the supporting ring, and the first and second sealing surfaces are arranged and formed so that, when the insulating tube and the metal armature are joined, the first sealing surface and the second sealing surface slide on one another to form a seal, and the supporting ring acting as a displacement body presses adhesive that has been introduced into the groove before the joining into the adhesive-bonding joint.