| 摘要 |
FIELD: metalworking.SUBSTANCE: invention relates to electrochemical protection of underground metal structures from corrosion. Earthing device comprises a tubular electrode made from material based on magnetite or high-silicon cast iron, current lead and heat shrink sleeve wherein current lead consists of two contact units located at ends of electrode, connected by conductors of current feed cable and consisting of pressed into electrode split bushings with height of 20-40 mm, with outer diameter which is 0.5-2.0 mm smaller than inner diameter of electrode, made with rectangular recesses at diameter with width of 2-4 mm and depth of 1.2 -1.3 times radius of sleeves, wherein at centre of sleeves there are through holes with diameter of 8-12 mm, in which simultaneously with cable conductors are pressed metal inserts of height which is 10-40 mm larger than that of sleeve, diameter of which is less than diameter of opening of sleeve by 0.4-1.5 mm, and on side surfaces of inserts on one side of contact pads in form of flat sections at an angle of 10-12 degrees to central axis, beginning at middle of insert, wherein contact units are filled with fusible solder on tin with thickness up to 12 mm, and cable lead is insulated with silicone sealant.EFFECT: technical result is longer service life and reduced electric power consumption for cathode protection.2 cl, 3 dwg |
