Bellows axial expansion joints for underground laying of pipelines with thermal insulation

摘要

The invention relates to the construction and can be used in the construction of pipelines, such as drainage pipelines hydroelectric object is to increase the reliability of the device upon expansion of its operational capabilities. The inventive compensator bellows (FIG. 1, FIG. 2) is placed on the pipe 1 provided with a heat insulation consisting of a polyurethane foam layer 2 and the plastic shell 3. The bellows compensator includes a metal bellows 4 welded thereto nozzles 5 and 6, which is located in protective steel casing 7 and is provided with a guide made in the form of three flanges 8-10 restricting angular and radial displacement compensator and without impeding axial displacement nozzles 5 and 6 relative to the housing 7. this nozzle 6 ilfona 4 is made longer than the pipe 5 and secured thereto slidable within the housing 7 two movable flange 9 and 10. On the flange 10 is installed a lock device 11 for limiting the position of the flange according to the amplitude of the axial stroke of bellows 4. The flange 8 is fixed to the pipe 5. Around long nozzle part 6 for redistributions steel casing 7 formed by the free heat insulation compensating portion 12 is protected from wetting teplogidrostoykoy aperture 13 of cylindrical shape with an oversize operation on the amplitude of B fona 4. The diaphragm 13 is fixed to the edges of the polyethylene sheath 3 on the compensation area 12 free from polyurethane foam layer 2 by a heat-shrinkable sleeve 14 with an inner layer of hot-melt adhesive and is protected from external influences polyethylene shrinkable sleeve 15. The sleeve 15 is welded by one edge by moving flanges 9, 10 to the pipe polyethylene sheath. Neprivarennyhrails its part is separated from the polyethylene sheath 3 damper seal 16 which prevents the penetration of large soil particles into the inner cavity of the compensating portion 12 during operation of the compensator and provides a free wheeling shrinkable sleeve 15 along the polyethylene sheath 3. On the other hand the sleeve 15 terminates near the end of a short nozzle 5. at the same between the case 7 and the bellows 4 as well as part of a long pipe insulation 6 has a filling 17 of foam melkogranulirovannogo penopoli Wires Retana system operative remote control 18 are arranged in a metal tube 19 attached to the inner side of the housing 7. Fulfillment of one of the pipes enables longer form around a portion of its free compensation of the polyurethane insulation portion, which facilitates and improves the conditions of compensation, providing secure payment changing the axial dimensions of pipes due to their thermal deformation, and the protection of the compensatory portion from wetting teplogidrostoykoy diaphragm CLOSE eplennoy on polyethylene sheath edges by heat-shrinkable sleeve, in conjunction with the protection of said diaphragm shrinkable sleeve having a possibility of free travel along the polyethylene sheath of thermal insulation and sealing the movable portion, eliminates the possibility of moisture and pollution "piston pump action effect" from the external environment finding bellows compensator due to the fact that there are no cups and seals, moving in a cage and leads to a highly reliable sealing compensator Thu on makes it possible to use it in flooded soils, thus extending its operational capability. PF 1, 2 yl.