Fireproof, waterproof and impact-resistant power cable and connecting structure thereof

Abstract

The utility model discloses a fire -prevention waterproof anti -impact power cable and connecting structure thereof, and the power cable includes wire core, fire -resistant mica tape, ceramization polyolefin insulating layer, metal band, halogen -free low -smoke polyolefin sheath. The connecting structure includes reinforced core, copper pipe, a plurality of winding connecting band, heat shrink sleeve, connecting shell, and the reinforced core is a plurality of steel wire ropes or rough metal rods. The utility model discloses a ceramization polyolefin insulating layer and fire -resistant mica tape form temperature gradient protection system, provide basic mechanical protection through metal band, improve the anti -impact performance of cable, and the basic waterproof performance is provided through the polyolefin sheath of integrated extrusion forming. On the connecting structure, through the cooperation of reinforced core and copper pipe, the anti -impact performance and conductive performance of the communication area can be improved, the same fire -prevention anti -impact ability as other areas of cable is provided through multilayer winding connecting band, and through the closure and glue injection of connecting shell, the good protection for the connecting area can be realized.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a fireproof, waterproof, and impact-resistant power cable and its connection structure. Background Technology

[0002] Currently, the fireproof, waterproof, and impact-resistant properties of cables are mostly addressed by using flame-retardant and high-temperature resistant polyvinyl chloride insulation materials to protect the bare metal wires of the cables. However, these materials have poor fireproof, waterproof, and impact-resistant performance and are easily broken. When burning, they release halogen gases and dense smoke, which can hinder the escape of people trapped in a fire and endanger their personal safety. Summary of the Invention

[0003] The purpose of this utility model is to provide a fireproof, waterproof, and impact-resistant power cable and its connection structure to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides a fireproof, waterproof, and impact-resistant power cable, comprising a conductor core, a fire-resistant mica tape, a ceramicized polyolefin insulation layer, a metal strip, and a halogen-free low-smoke polyolefin sheath; the fire-resistant mica tape is overlapped and wrapped around the conductor core, the ceramicized polyolefin insulation layer is wrapped around the fire-resistant mica tape, the metal strip is wrapped around the ceramicized polyolefin insulation layer, and the metal strip is wrapped around a layer of halogen-free low-smoke polyolefin sheath.

[0005] Preferably, the conductor core is a plurality of bare metal wires; the metal strip is a copper strip or an aluminum strip.

[0006] This application also provides a connection structure for the aforementioned power cable, the connection structure comprising a reinforcing core, a copper tube, several spiral connecting strips, a heat shrink sleeve, and a connection shell; the reinforcing core is a multi-strand steel wire rope or a rough metal rod; multiple layers of spiral connecting strips are wound around the outside of the copper tube, and a heat shrink sleeve is provided on the outside of the spiral connecting strips; a connection shell is provided on the outside of the heat shrink sleeve, the connection shell comprising a shell part, a locking nut, and a water-stop soft rubber tube, the shell part being tubular, with circumferentially distributed locking wings at both ends, a limiting protrusion ring being provided on the side of the locking wing away from the end, and a thread being provided on the outside of the locking wing, the water-stop soft rubber tube being located inside the locking wing, and the locking nut engaging with the thread on the outside of the locking wing.

[0007] Preferably, the reinforcing core is a steel wire rope, with copper segments provided near both ends. The diameter of the copper segments is 1.5-2 times the diameter of the steel wire rope, and they are fixedly provided on the outside of the steel wire rope.

[0008] Preferably, the winding connecting strip includes mica tape, ceramizable polyolefin insulating tape, and connecting metal tape.

[0009] Preferably, the copper tube has openings on both sides, and the openings are located in the copper section area of ​​the reinforcing core during use.

[0010] Preferably, the outer casing is provided with an injection hole, and the interior of the outer casing is provided with a sealing and waterproof adhesive layer.

[0011] The fireproof, waterproof, and impact-resistant power cable proposed in this utility model can protect the cable from flames, rain, and impacts, and can extend the cable's normal operating time in flames. Specifically, this application uses a ceramicized polyolefin insulation layer and fire-resistant mica tape to form a temperature gradient protection system, a metal strip to provide basic mechanical protection and improve the cable's impact resistance, and an integrally extruded polyolefin sheath to provide basic waterproof performance. In terms of connection structure, the combination of a reinforced core and copper tube can improve the impact resistance and conductivity of the connecting area, and the multi-layer wound connecting tape provides the same fireproof and impact-resistant capabilities as other areas of the cable. The sealing and encapsulation of the connecting shell can achieve good protection for the connecting area. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the power cable of this utility model;

[0013] Figure 2 This is a hierarchical structure diagram of the power cable of this utility model.

[0014] Figure 3 This is a schematic diagram of one embodiment of the connection structure of this utility model.

[0015] Figure 4 This is a schematic diagram of another embodiment of the connecting structure reinforcing core and copper tube of this utility model. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] As attached Figure 1-2 As shown, the fireproof, waterproof and impact-resistant power cable of this utility model includes a conductor core 1, a fire-resistant mica tape 2, a ceramicized polyolefin insulation layer 3, a metal tape 4, and a halogen-free low-smoke polyolefin sheath 5.

[0018] The conductor core 1 consists of several bare metal wires; the fire-resistant mica tape 2 is wrapped around the conductor core 1 in an overlapping manner; the ceramicized polyolefin insulation layer 3 is wrapped around the fire-resistant mica tape 2; a metal tape 4, which is a copper tape or an aluminum tape, is wrapped around the ceramicized polyolefin insulation layer 3; and a halogen-free low-smoke polyolefin sheath 5 is wrapped around the metal tape 4.

[0019] The ceramicized polyolefin insulation layer 3 is extruded on the outside of the refractory mica belt 2 using a screw extruder, and the halogen-free low-smoke polyolefin sheath 5 is extruded on the outside of the metal belt 4 using a screw extruder.

[0020] In the event of a fire, as the flames gradually approach the cable, the halogen-free low-smoke polyolefin sheath 5 will ignite after the flames have burned the cable for a certain period. After the sheath 5 disintegrates due to the flames, the non-combustible metal strip 4 prevents further combustion into the cable, thus protecting the ceramicized polyolefin insulation layer 3 from cracking under impact. Simultaneously, the ceramicized polyolefin insulation layer 3 gradually crystallizes under high temperatures. When the temperature reaches a critical point (typically 380-450℃), the inorganic precursors (such as silicates and borates) in the ceramicized polyolefin undergo a eutectic reaction with the matrix material, forming a continuous and dense ceramic-like shell. This shell has high hardness and low porosity (porosity less than 5%), effectively blocking external flames and heat, ensuring the overall strength and usability of the cable after a certain period. Furthermore, the fire-resistant mica tape 2 has excellent insulation properties at high temperatures, further extending the power supply time of the power circuit when wrapped around the conductor core 1. Furthermore, halogen-free low-smoke polyolefins do not release halogen gases or smoke when burned, further protecting the personal safety of people trapped at the fire scene and increasing their chances of escape.

[0021] In terms of fire resistance, this application utilizes a temperature gradient protection system formed by a ceramicized polyolefin insulation layer (triggering a ceramicization reaction at 380-450℃) and fire-resistant mica tape (withstanding high temperatures of 950-1000℃). In the early stages of a fire, the ceramicized layer rapidly forms a dense ceramic shell (porosity <5%), effectively blocking flame and heat transfer. When the temperature exceeds 450℃, the mica tape continues to provide insulation protection, with both complementing each other to achieve full fire cycle protection. This combination offers a longer fire resistance time compared to single fire-resistant materials (such as traditional silicone rubber or pure mica tape).

[0022] In terms of impact resistance, the metal strip, in addition to forming a physical fireproof layer after the sheath is ablated, provides basic mechanical protection and improves the cable's impact resistance. Regarding waterproofing, the halogen-free, low-smoke polyolefin sheath 5, formed by integral extrusion molding, provides basic waterproofing.

[0023] In the process of using cables, it is inevitable that there will be situations where multiple cables need to be connected to each other. This application also provides a connection structure l.

[0024] The connection structure l includes a reinforcing core l1, a copper tube l2, several spiral connecting strips l3, a heat shrink sleeve l4, and a connecting shell l5.

[0025] The reinforcing core l1 has a relatively rough surface and can be a multi-strand steel wire rope or a metal rod with a relatively rough surface. Furthermore, as shown in the attached... Figure 4 As shown, the reinforcing core l1 is a copper segment l11 provided near both ends of the wire rope. The diameter of the copper segment is 1.5-2 times the diameter of the wire rope and is fixedly provided on the outside of the wire rope.

[0026] The copper tube l2 has openings l21 on both sides. In use, the reinforcing core l1 is first placed in the center of the multiple bare metal wires of the conductive core. Then, the copper tube l2 is fitted over the interface between the two wires, with the openings l21 located in the copper segment l11 area of ​​the reinforcing core l1. Hydraulic clamps are then used to press and tighten the tube in the opening l21 area, creating a groove and connecting the conductive cores. The reinforcing core l1 improves the impact resistance of the connected area, and the copper segment l11 improves the conductivity of the connection.

[0027] A multi-layered spiral connecting tape l3 is wrapped around the outside of the copper tube l2, including mica tape l31, ceramicizable polyolefin insulation tape l32, connecting metal tape l33, and the spiral connecting tape l3 should overlap with the corresponding outer layers of the two cables.

[0028] A heat-shrink sleeve l4 is provided on the outside of the winding connecting strip l3, which is heat-shrinked by hot air to achieve good limiting and protection of the internal structure.

[0029] A connecting shell l5 is provided on the outside of the heat shrink sleeve l4. The connecting shell l5 includes a shell part l51, a locking nut 152, and a waterproof soft rubber tube l53. The shell part l51 is tubular, with circumferentially distributed locking wings l511 at both ends. The locking wings are achieved by setting circumferentially arrayed slots on the connecting shell l5. A limiting protrusion ring l54 is provided on the side of the locking wing away from the end. Threads are provided on the outside of the locking wing. In use, the waterproof soft rubber tube l53 is sleeved on the heat shrink sleeve l4, the locking wings of the shell part l51 are inserted into the outside of the waterproof soft rubber tube l53, and the locking nut 152 is screwed inward to achieve a tight compression of the waterproof soft rubber tube l53 and its internal structure by the locking wings. Due to the good deformation ability of the waterproof soft rubber tube l53, good waterproof performance is achieved.

[0030] The outer contour of the internal threaded hole of the locking nut 152 can be trapezoidal, with a smaller outer inner diameter, which will continuously squeeze the locking wing l511 inward during the tightening process.

[0031] Furthermore, an injection hole l55 is provided on the outer casing l51 for injecting epoxy resin or other sealing and waterproofing adhesive. After the locking nut 152 and the water-stop soft rubber tube l53 are fixed, the sealing and waterproofing adhesive is injected through the injection hole l55 to achieve a better waterproofing effect.

[0032] It should be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A fireproof, waterproof, and impact-resistant power cable, characterized in that, It includes a conductor core, a fire-resistant mica tape, a ceramicized polyolefin insulation layer, a metal strip, and a halogen-free low-smoke polyolefin sheath; the fire-resistant mica tape is wrapped around the conductor core in an overlapping manner, the ceramicized polyolefin insulation layer is wrapped around the fire-resistant mica tape, the metal strip is wrapped around the ceramicized polyolefin insulation layer, and the metal strip is wrapped around a layer of halogen-free low-smoke polyolefin sheath.

2. The fireproof, waterproof, and impact-resistant power cable according to claim 1, characterized in that, The conductor core consists of several bare metal wires; the metal strip is a copper strip or an aluminum strip.

3. A connection structure for the power cable of claim 2, characterized in that, The connecting structure includes a reinforcing core, a copper tube, several spiral connecting strips, a heat shrink sleeve, and a connecting shell. The reinforcing core is a multi-strand steel wire rope or a rough metal rod. Multiple layers of spiral connecting strips are wound around the outside of the copper tube, and a heat shrink sleeve is provided on the outside of the spiral connecting strips. A connecting shell is provided on the outside of the heat shrink sleeve. The connecting shell includes a shell part, a locking nut, and a water-stop soft rubber tube. The shell part is tubular, with circumferentially distributed locking wings at both ends. A limit protrusion ring is provided on the side of the locking wing away from the end. A thread is provided on the outside of the locking wing. The water-stop soft rubber tube is located inside the locking wing, and the locking nut is engaged with the thread on the outside of the locking wing.

4. The connection structure according to claim 3, characterized in that, The reinforcing core is a steel wire rope, with copper segments near both ends. The diameter of the copper segments is 1.5-2 times the diameter of the steel wire rope, and they are fixedly installed on the outside of the steel wire rope.

5. The connection structure according to claim 3, characterized in that, The winding connecting strip includes mica tape, ceramizable polyolefin insulating tape, and connecting metal tape.

6. The connection structure according to claim 4, characterized in that, The copper tube has openings on both sides, and the openings are located in the copper section area of ​​the reinforcing core during use.

7. The connection structure according to claim 3, characterized in that, The outer casing is provided with an injection hole, and the inside of the outer casing is provided with a sealing and waterproof adhesive layer.

Images