ELECTRICALLY INSULATING FLANGE CONNECTION OF PLAIN TUBES Russian patent published in 2010 - IPC F16L25/02 

FIELD: machine building.

SUBSTANCE: electrically insulating flange connection of plain tubes includes metal housing in the form of cylinder restricted on one side with inner annular projection, and on the other side rigidly connected to one flange. The other flange is equipped with cylindrical projection tightly enclosed in metal housing to which cylinder from dielectric material is inserted without a gap, between which and cylindrical projection of the flange the annular rubber gasket is installed, which protects inner cavities of connection against atmospheric action. Annular sealing gaskets, metal rings, C-shaped rings made from material which is harder than tube material, movable metal bushes and stepped bushes from dielectric material are in series located symmetrically from electrically insulating insert between tubes. When tightening the fasteners the sealing gaskets are pressed in closed volume between side surfaces of electrically insulated insert and metal rings, and inner conical surface of movable metal bushes acts on outer spherical surface of C-shaped rings, presses them, and pointed projections on inner surface of C-shaped rings are pressed to the tube body by fixing electrically insulating flange connection of plain tubes.

EFFECT: invention improves the connection reliability.

1 dwg