Photoelectric composite medium-voltage fireproof lock type cable

[0021] Example 1

[0022] A photoelectric composite medium voltage fireproof lock type cable. The cable includes a cable core composed of multiple strands of wire cores. The cable core is wrapped with a protective layer. A first filling layer is filled between the cable core and the protective layer. The layer protects its inner core. Each wire core includes multiple sets of core materials and an insulating layer wrapped around the multiple sets of core materials. The cross section of the core materials is an equilateral triangle. Multiple groups of core materials can be distributed around the group of core materials. Multiple sets of core materials are wrapped with an insulating layer, and a second filling layer is filled between the core materials and the insulating layer. The insulating layer can cause interference between the multiple sets of cores. Of course, an insulating layer can also be provided outside each group of core materials, and the insulating layer on the core material is separated from the rest of the core materials in the group of core materials, so that the transmission of signals or electric energy does not interfere with each other. A number of cooling fireproof pipes are evenly distributed in the protective layer along the circumference of the protective layer, and the length direction of the cooling fireproof pipe is arranged along the length direction of the cable. The cooling fireproof pipe makes the cable still usable under high temperature conditions.

[0023] The outer cylindrical surface of the insulating layer of each core is provided with positioning protrusions. The upper side of the positioning protrusion is short and the lower side is long. A first groove-shaped structure is provided on the side of the positioning protrusion. The lower side is provided with a second groove, and the outer end of the second groove is provided with a raised edge protrusion; the outer cylindrical surface of the insulating layer of each core is provided with a first groove corresponding to the first groove-shaped structure Two groove-shaped structures, the lower side of the second groove-shaped structure is provided with a protruding structure adapted to the second groove, and one end of the protruding structure is provided with a locking groove adapted to the edge protrusion; When the two wire cores are connected, a locking strip is installed in the space formed by the first groove-shaped structure of one wire core and the second groove-shaped structure of the other wire core.

[0024] When splicing, the front elevations of the insulating layers of two adjacent strands of wire cores are held in parallel and close, and the end of the insulating layer of one strand of wire cores close to the other strand is gently pressed down. The convex structure on the upper core squeezes the locking bar into the first groove-shaped structure on the side of the positioning protrusion on the other strand core insulation layer, so that the elastically deformed locking bar is completely located on the first side of the positioning protrusion. In the groove-shaped structure, after the end of the protruding structure is completely embedded in the corresponding positioning protrusion, the locking strip returns to its original shape under the action of its own elastic force, and is stuck in the first groove-shaped structure and the side of the positioning protrusion. The second groove-shaped structures play the role of vertical tightness and positioning. At the same time, the right side of the second groove under the positioning protrusion and the right side of the protruding structure occlude each other to lock in the horizontal direction. And positioning function, so as to complete the card connection of two adjacent strands.

[0025] Example 2

[0026] On the basis of the first embodiment, the protective layer is provided with heat dissipation holes. The heat dissipation holes include an inner polyurethane flame-retardant waterproof layer connected to the inner side of the protective layer, and an outer polyurethane flame-retardant waterproof layer connected to the outer side of the protective layer. A spring rope is connected between the layer and the outer polyurethane flame-retardant waterproof layer. A heat dissipation hole is opened on the protective layer, and an inner polyurethane flame-retardant waterproof layer and an outer polyurethane flame-retardant waterproof layer are arranged in the heat dissipation hole to avoid damage caused by external water vapor intruding into the cable.

[0027] Example 3

[0028] On the basis of Embodiment 1 or Embodiment 2, the protective layer includes a polyethylene-filled vulcanized insulating layer, a copper wire braided shielding layer, an aluminum halogen-free low-smoke flame-retardant polyolefin bonding protective layer, aluminum-free The halogen-low-smoke flame-retardant polyolefin adhesive protective layer mainly uses the characteristics of halogen-free low-smoke flame-retardant polyolefin materials that do not contain halogen and other heavy metals such as lead, cadmium, chromium, mercury, etc., even if burned, no toxic smoke such as halogenation will occur Hydrogen also has no corrosive gas release and produces very little smoke.