High-temperature-resistant, low-smoke, halogen-free, flame-retardant and fire-resistant polyolefin cable

Abstract

The invention discloses a high-temperature-resistant, low-smoke, halogen-free, flame-retardant and fire-resistant polyolefin cable, relates to the technical field of cables, and aims to solve the problems that a cable core twisting or welding mode is often adopted for connection of a traditional polyolefin cable in the prior art, operation is troublesome, time and labor are consumed, cable core connection of the cable cannot be conveniently carried out, and practicability is poor. The cable body comprises a cable core and a functional sleeve, the cable core comprises a wire core and an inner sheath, the wire core comprises a conductor, an inner shielding layer, an inner insulating layer and a wire core protection sleeve, one side of the cable body is provided with a connecting piece, the connecting piece is composed of a connecting column and a winding layer, the two sides of the connecting column are symmetrically provided with jacks respectively, and the winding layer is arranged in the cable body. A plurality of connecting holes are formed in the connecting column, the two ends of each connecting hole are communicated with the two inserting holes respectively, a lower conductive plate is fixedly installed on the lower portion of the interior of the connecting hole of the connecting column, a conductive block is fixedly installed in the middle of the upper portion of the lower conductive plate, and an upper conductive plate is arranged above the conductive block.

Description

Technical Field

[0001] The invention relates to the technical field of cables, and in particular to a high-temperature resistant, low-smoke, halogen-free, flame-retardant and fire-resistant polyolefin cable. Background Art

[0002] Cable is a general term for optical cables, electrical cables, etc. Cables have a wide range of uses and are usually used to transmit information or electricity. Polyolefin cables are a type of cable that uses polyolefin materials as insulation layers or sheaths. Polyolefin is a polymer material that is mainly made of monomers such as ethylene and propylene. It has excellent electrical insulation, heat resistance, corrosion resistance, and mechanical strength, so it is widely used in cable manufacturing.

[0003] For example, the authorized patent with announcement number CN220137987U (a radiation-free environmentally friendly cross-linked polyolefin cable): includes an insulating layer and a copper core, the copper core is arranged in the insulating layer, a protective outer layer is sleeved on the outer side of the insulating layer, the outer protective layer includes a waterproof outer layer, a flame retardant inner layer and a heat conductive layer, the flame retardant inner layer is connected to the waterproof outer layer, the heat conductive layer is fixed on the waterproof outer layer, an elastic supporting connection part is arranged on the heat conductive layer, the supporting connection part is connected to the flame retardant inner layer, and the supporting connection part squeezes the flame retardant inner layer; a connecting part is formed on the waterproof outer layer, and the connecting part is connected to the flame retardant inner layer; the flame retardant inner layer includes an isolation net wrapped on the surface of the insulating layer, a flame retardant is arranged at the mesh of the isolation net, a flame retardant is fixed on the flame retardant, and the waterproof outer layer is fixed on the flame retardant;

[0004] Although the above-mentioned prior art has good moisture-proof and flame-retardant effects, it does not have an auxiliary connection structure. When the polyolefin cable is installed over a long distance, the ends of the two cables will be connected. The connection of traditional polyolefin cables often adopts wire core twisting or welding, which is cumbersome to operate, time-consuming and labor-intensive, and cannot conveniently connect the wire cores of the cable, and has poor practicality. Therefore, the market urgently needs to develop a high-temperature, low-smoke, halogen-free, flame-retardant and fire-resistant polyolefin cable to help people solve the existing problems. Summary of the invention

[0005] The object of the present invention is to provide a high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable to solve the problem that the connection of traditional polyolefin cables proposed in the above background technology often adopts the method of wire core twisting or welding, which is cumbersome to operate, time-consuming and labor-intensive, and cannot conveniently connect the wire cores of the cable, and has poor practicality.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-temperature resistant, low-smoke, halogen-free, flame-retardant and fire-resistant polyolefin cable, comprising a cable body, the cable body comprising a cable core and a functional sleeve, the cable core comprising a wire core and an inner sheath, the wire core comprising a conductor, an inner shielding layer, an inner insulating layer and a wire core protective sleeve, a connector is provided on one side of the cable body, the connector is composed of a connecting column and a winding layer, plug holes are symmetrically provided on both sides of the connecting column, a plurality of connecting holes are provided inside the connecting column, and the two ends of the connecting hole are respectively connected to the two plug holes, a lower conductive plate is fixedly installed below the inside of the connecting hole of the connecting column, a conductive block is fixedly installed in the middle above the lower conductive plate, an upper conductive plate is provided above the conductive block, a rubber block is fixedly installed above the upper conductive plate, an expansion cavity is provided inside the connecting column along the top of the rubber block, and a rigid foam material liquid is provided inside the expansion cavity.

[0007] Preferably, the functional cover comprises an outer sheath, an armor layer, a thermal insulation layer, a flame retardant layer, an outer shielding layer and an outer insulating layer, and the outer sheath, armor layer, thermal insulation layer, flame retardant layer, outer shielding layer and outer insulating layer are arranged in sequence from outside to inside.

[0008] Preferably, an isolation layer is further provided between the temperature insulation layer and the flame retardant layer, and the isolation layer is made of high temperature resistant and corrosion resistant glass fiber cloth material.

[0009] Preferably, the interior of the inner sheath is filled with filling ropes along the outer side of the wire core, and the surface of the conductor is coated with a metal oxide film.

[0010] Preferably, the inner shielding layer is arranged on the outside of the conductor, the inner insulating layer is arranged on the outside of the inner shielding layer, and the core protection sleeve is arranged on the outside of the inner insulating layer.

[0011] Preferably, a threaded hole is provided inside the connecting column along the top of the expansion chamber, a sealing plug is provided below the inside of the threaded hole, a sealing bolt is provided above the connecting column, and the threaded end of the sealing bolt is screwed into the inside of the threaded hole.

[0012] Preferably, side blocks are symmetrically fixedly installed on both sides of the rubber block, the side blocks are made of rubber material, and the side blocks are bonded to the connecting columns.

[0013] Preferably, the lower conductive plate and the upper conductive plate are both configured as arc-shaped plates, and the inner sides of both ends of the lower conductive plate and the upper conductive plate are both provided with enlarged openings.

[0014] Preferably, both ends of the connecting column are arranged in a conical shape, and a sealing rubber ring is arranged inside the connecting column along the outer side of the insertion hole.

[0015] Preferably, the winding layer includes an insulating tape, a metal tape and a protective tape, the insulating tape is wound around the outer surface of the connecting column, the metal tape is wound around the outside of the insulating tape, and the protective tape is wound around the outside of the metal tape.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the polyolefin cable is installed over a long distance, the invention adopts a high-temperature resistant, low-smoke, halogen-free, flame-retardant and fire-resistant polyolefin cable and its connection structure. Compared with the traditional wire core twisting or welding method, the invention has significant advantages. Through the design of the connector, the cable core is quickly and conveniently connected. The lower conductive plate, conductive block and upper conductive plate arranged inside the connector, as well as the expandable rigid foam material liquid, not only ensure the reliable electrical connection between the wire core conductors, but also automatically clamp the wire core through expansion, eliminating the tedious twisting or welding steps, greatly improving the convenience of operation, shortening the construction time, and enhancing the practicability. Therefore, when used in long-distance installation and complex environments, it can improve work efficiency, reduce construction difficulty, and has broad application prospects.

[0018] 2. The cable body of the invention significantly improves the comprehensive performance of the cable through the functional sleeve structure. The outer sheath adopts low-smoke halogen-free polyolefin material, which not only enhances the wear resistance and corrosion resistance of the cable, but also ensures that the smoke generated during combustion is small and non-toxic, which is more friendly to the environment and personnel safety, and greatly reduces the hazards in accidental situations such as fire. At the same time, the armor layer provides additional mechanical protection, increases the tensile strength and lateral pressure resistance of the cable, makes the cable more reliable when used in complex environments, and extends the service life of the cable. The thermal insulation layer adopts high-temperature resistant, non-combustible mica tape or ceramic silicone rubber and other materials to effectively isolate the influence of external high temperature on the inside of the cable, ensuring the normal operation of the cable in a high temperature environment, and significantly improving the heat resistance and operation stability of the cable. The setting of the flame retardant layer and the isolation layer further enhances the flame retardant performance of the cable and reduces the risk of fire. In terms of flame retardant performance, these structures together constitute a multiple safety barrier for the cable.

[0019] 3. The invention realizes automatic clamping during cable connection through the design of the expansion chamber inside the connecting column and the rigid foam material liquid, which not only simplifies the connection process, but also improves the reliability and stability of the connection, and significantly improves the work efficiency and safety of the cable connection. At the same time, the setting of the threaded hole, the sealing plug and the sealing bolt ensures that the expansion chamber can be opened smoothly when needed, and prevents external impurities from entering the expansion chamber, thereby ensuring the reliability and durability of the cable connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A schematic diagram of a high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable according to the present invention;

[0021] Figure 2 is a cross-sectional view of a connector of the present invention;

[0022] Figure 3 is a side view of a connecting column of the present invention;

[0023] Figure 4 It is an enlarged schematic diagram of the A part of the present invention;

[0024] Figure 5 is a side view of the cable body of the present invention;

[0025] Figure 6 It is a schematic diagram of the internal composition of the functional sleeve of the present invention;

[0026] Figure 7 It is a schematic diagram of the internal composition of the wire core of the present invention.

[0027] In the figure: 1. Cable body; 101. Functional sleeve; 1011. Outer sheath; 1012. Armor layer; 1013. Insulation layer; 1014. Flame retardant layer; 1015. Outer shielding layer; 1016. Outer insulation layer; 102. Core; 1021. Conductor; 1022. Inner shielding layer; 1023. Inner insulation layer; 1024. Core protection sleeve; 103. Inner sheath; 2. Connector; 3. Connecting column; 301. Socket; 302. Connecting hole; 303. Expansion cavity; 304. Threaded hole; 4. Wrapping layer; 401. Insulation tape; 402. Metal tape; 403. Protective tape; 5. Sealing rubber ring; 6. Lower conductive plate; 7. Conductive block; 8. Upper conductive plate; 9. Rubber block; 10. Sealing plug; 11. Sealing bolt; 12. Edge block; 13. Enlarged mouth; 14. Filling rope. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] See also Figure 1-7An embodiment of the present invention is as follows: a high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable, comprising a cable body 1, the cable body 1 comprising a cable core and a functional sleeve 101, the cable core comprising a wire core 102 and an inner sheath 103, the wire core 102 comprising a conductor 1021, an inner shielding layer 1022, an inner insulating layer 1023 and a wire core protective sleeve 1024, a connector 2 is provided on one side of the cable body 1, the connector 2 is composed of a connecting column 3 and a winding layer 4, jacks 301 are symmetrically provided on both sides of the connecting column 3, and a plurality of connecting holes 301 are provided inside the connecting column 3. 02, and the two ends of the connecting hole 302 are connected with the two jacks 301 respectively, a lower conductive plate 6 is fixedly installed at the lower part of the connecting hole 302 of the connecting column 3, a conductive block 7 is fixedly installed in the middle above the lower conductive plate 6, an upper conductive plate 8 is arranged above the conductive block 7, a rubber block 9 is fixedly installed above the upper conductive plate 8, an expansion cavity 303 is arranged inside the connecting column 3 along the top of the rubber block 9, and a rigid foam material liquid is arranged inside the expansion cavity 303, and the rigid foam material liquid is a special polyurethane foaming material, which can expand after contacting with air.

[0030] During use, when two cables are connected, the conductors 1021 of different cores 102 of the two cables are respectively stripped out, and then inserted into the jacks at both ends of the connecting column 3, and the conductors 1021 of the corresponding cores 102 of the two cables are inserted into the same connecting hole 302. The conductors 1021 of the cores 102 of the two cables are electrically connected through the lower conductive plate 6, conductive block 7 and upper conductive plate 8. At the same time, the expansion cavity 303 can be opened, and the internal rigid foam material liquid will expand after contacting with the air, and the rubber block 9 is pressed downward elastically, so that the upper conductive plate 8 is pressed tightly on the conductor 1021, thereby increasing the electrical connectivity and realizing the automatic clamping work when the cables are connected, which greatly improves the convenience of operation.

[0031] See also Figure 5 and Figure 6The functional sleeve 101 includes an outer sheath 1011, an armor layer 1012, a thermal insulation layer 1013, a flame retardant layer 1014, an outer shielding layer 1015 and an outer insulating layer 1016, and the outer sheath 1011, the armor layer 1012, the thermal insulation layer 1013, the flame retardant layer 1014, the outer shielding layer 1015 and the outer insulating layer 1016 are arranged in sequence from the outside to the inside, and the outer insulating layer 1016 is made of high temperature resistant, low smoke and halogen-free polyolefin material, such as cross-linked polyethylene or ethylene-vinyl acetate copolymer, which has excellent electrical insulation. The flame retardant layer 1014 is made of flame retardant polyolefin material and added with other flame retardant enhancers to improve the flame retardant performance of the cable. The thermal insulation layer 1013 is made of high temperature resistant, non-combustible mica tape or ceramic silicone rubber and other materials, which can maintain structural integrity in a high temperature environment and prevent the internal conductor and insulation layer of the cable from being damaged. The outer sheath 1011 is made of low-smoke halogen-free polyolefin material, which has good wear resistance and corrosion resistance, and produces little smoke during combustion, and does not contain toxic components such as halogen.

[0032] See also Figure 6 An isolation layer is also provided between the thermal insulation layer 1013 and the flame retardant layer 1014, and the isolation layer is made of high temperature resistant and corrosion resistant glass fiber cloth material, which enhances the flame retardant performance of the cable and reduces the risk of fire.

[0033] See also Figure 5 and Figure 7 The inside of the inner sheath 103 is filled with filling rope 14 along the outside of the core 102, which not only makes the cable structure more stable, but also improves the flexibility and bending resistance of the cable, making the cable more flexible and convenient during laying and use. The surface of the conductor 1021 is coated with a metal oxide film with good conductivity, which improves the conductivity and corrosion resistance of the conductor, extends the service life of the cable, and improves the electrical performance of the cable.

[0034] See also Figure 7 The inner shielding layer 1022 is arranged on the outside of the conductor 1021, the inner insulating layer 1023 is arranged on the outside of the inner shielding layer 1022, and the core protection sleeve 1024 is arranged on the outside of the inner insulating layer 1023. The core protection sleeve 1024 is made of low-smoke and halogen-free polyolefin material, which not only has good insulation performance, but also ensures that the amount of smoke generated by the cable when burning is small and non-toxic, thereby enhancing the safety and environmental protection of the cable. The setting of the inner shielding layer 1022 and the inner insulating layer 1023 further improves the anti-interference ability and insulation strength of the cable, and ensures the electrical performance and stability of the cable.

[0035] See also Figure 2-4A threaded hole 304 is provided inside the connecting column 3 along the top of the expansion chamber 303, a sealing plug 10 is provided below the threaded hole 304, a sealing bolt 11 is provided above the connecting column 3, and the threaded end of the sealing bolt 11 is screwed into the threaded hole 304, so that during the cable connection process, by unscrewing the sealing bolt 11 and pushing the sealing plug 10 into the expansion chamber 303 through the rod, external air can flow into the expansion chamber 303, facilitating the expansion of the rigid foam material liquid, and then the setting of the threaded hole 304, the sealing plug 10 and the sealing bolt 11 ensures that the expansion chamber 303 can be opened smoothly when needed, and prevents external impurities from entering the expansion chamber 303, thereby ensuring the reliability and durability of the cable connection.

[0036] See also Figure 2-4 The rubber block 9 is symmetrically fixed with side blocks 12 on both sides. The side blocks 12 are made of rubber material and are bonded to the connecting column 3. The design of the side blocks 12 on both sides of the rubber block 9 effectively prevents the rubber block 9 from sliding down by itself when not affected by external force, thereby ensuring the stability and reliability of the cable connection and enhancing the firmness of the cable connection.

[0037] See also Figure 2-4 The lower conductive plate 6 and the upper conductive plate 8 are both configured as arc-shaped plates to increase the contact area with the conductor 1021. The inner sides of both ends of the lower conductive plate 6 and the upper conductive plate 8 are provided with enlarged openings 13. Furthermore, through the arc-shaped design of the lower conductive plate 6 and the upper conductive plate 8 and the setting of the enlarged openings 13, not only the contact area with the conductor 1021 and the electrical connection stability are improved, but also the insertion and connection of the conductor 1021 are facilitated, thereby improving the electrical performance and working efficiency of the cable connection.

[0038] See also Figure 2 The two ends of the connecting column 3 are tapered, and a sealing rubber ring 5 is arranged inside the connecting column 3 along the outer side of the insertion hole 301. The tapered ends of the connecting column 3 and the addition of the sealing rubber ring 5 not only facilitate the insertion and connection of the cable, but also improve the sealing and waterproof performance of the connection, and enhance the reliability and durability of the cable connection.

[0039] See also Figure 2 The winding layer 4 includes an insulating tape 401, a metal tape 402 and a protective tape 403. The insulating tape 401 is wound around the outer surface of the connecting column 3, the metal tape 402 is wound around the outer side of the insulating tape 401, and the protective tape 403 is wound around the outer side of the metal tape 402. The protective tape 403 is made of low-smoke and halogen-free polyolefin material. The multi-layer structure design of the winding layer 4, including the insulating tape 401, the metal tape 402 and the protective tape 403, not only improves the insulation performance and mechanical strength of the cable connection part, but also enhances the anti-interference ability and corrosion resistance of the cable.

[0040] Working principle: When in use, the cable body 1 has a multi-layer functional sleeve 101 structure, including an outer sheath 1011, an armor layer 1012, a thermal insulation layer 1013, a flame retardant layer 1014, an outer shielding layer 1015 and an outer insulating layer 1016, etc., to ensure that the cable has excellent wear resistance, corrosion resistance, high temperature resistance, flame retardancy and low smoke and halogen-free properties. When the cable is connected, the connection column 3 and the jack 301 design in the connector 2 are used to insert the conductors 1021 of the different cores 102 of the two cables into the corresponding jacks 301 and the connection holes 302 respectively, and the conductors 1021 of the two cables are connected through the lower conductive plate 6, the conductive block 7 and the upper conductive plate 8 realizes electrical connection. At the same time, the expansion chamber 303 is opened, so that the internal rigid foam material liquid expands after contacting with the air, pushing the rubber block 9 to press down elastically, thereby making the upper conductive plate 8 press the conductor 1021 tightly, thereby enhancing the stability of the electrical connection and the automatic clamping effect. Then, the multi-layer structure of the upper winding layer 4, including the insulating tape 401, the metal tape 402 and the protective tape 403, is wound on the outer side of the connecting column 3, thereby further improving the insulation performance, mechanical strength, anti-interference ability and corrosion resistance of the cable connection part, thereby facilitating the safe, stable and efficient operation of the cable in various complex environments.

[0041] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable, comprising a cable body (1), characterized in that: The cable body (1) comprises a cable core and a functional sleeve (101), the cable core comprises a wire core (102) and an inner sheath (103), the wire core (102) comprises a conductor (1021), an inner shielding layer (1022), an inner insulating layer (1023) and a wire core protective sleeve (1024), a connector (2) is arranged on one side of the cable body (1), the connector (2) comprises a connecting post (3) and a winding layer (4), the two sides of the connecting post (3) are symmetrically provided with plug holes (301), and the interior of the connecting post (3) is provided with a plurality of connecting holes (301). 2), and the two ends of the connection hole (302) are respectively connected to the two jacks (301), a lower conductive plate (6) is fixedly installed below the connection hole (302) of the connection column (3), a conductive block (7) is fixedly installed in the middle above the lower conductive plate (6), an upper conductive plate (8) is arranged above the conductive block (7), a rubber block (9) is fixedly installed above the upper conductive plate (8), an expansion chamber (303) is arranged inside the connection column (3) along the top of the rubber block (9), and a rigid foam material liquid is arranged inside the expansion chamber (303).

2. The high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable according to claim 1, characterized in that: The functional sleeve (101) comprises an outer sheath (1011), an armor layer (1012), a thermal insulation layer (1013), a flame retardant layer (1014), an outer shielding layer (1015) and an outer insulating layer (1016), and the outer sheath (1011), the armor layer (1012), the thermal insulation layer (1013), the flame retardant layer (1014), the outer shielding layer (1015) and the outer insulating layer (1016) are arranged in sequence from the outside to the inside.

3. The high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable according to claim 2, characterized in that: An isolation layer is also provided between the temperature insulation layer (1013) and the flame retardant layer (1014), and the isolation layer is made of a high temperature resistant and corrosion resistant glass fiber cloth material.

4. The high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable according to claim 1, characterized in that: The interior of the inner sheath (103) is filled with a filling rope (14) along the outer side of the wire core (102), and the surface of the conductor (1021) is coated with a metal oxide film.

5. The high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable according to claim 1, characterized in that: The inner shielding layer (1022) is arranged on the outside of the conductor (1021), the inner insulating layer (1023) is arranged on the outside of the inner shielding layer (1022), and the wire core protection sleeve (1024) is arranged on the outside of the inner insulating layer (1023).

6. The high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable according to claim 1, characterized in that: A threaded hole (304) is provided inside the connecting column (3) along the top of the expansion chamber (303), a sealing plug (10) is provided below the inside of the threaded hole (304), a sealing bolt (11) is provided above the connecting column (3), and the threaded end of the sealing bolt (11) is screwed into the inside of the threaded hole (304).

7. The high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable according to claim 1, characterized in that: Side blocks (12) are symmetrically fixedly mounted on both sides of the rubber block (9); the side blocks (12) are made of rubber material; and the side blocks (12) are bonded to the connecting column (3).

8. The high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable according to claim 1, characterized in that: The lower conductive plate (6) and the upper conductive plate (8) are both configured as arc-shaped plates, and the inner sides of both ends of the lower conductive plate (6) and the upper conductive plate (8) are both provided with enlarged openings (13).

9. The high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable according to claim 1, characterized in that: Both ends of the connecting column (3) are arranged in a conical shape, and a sealing rubber ring (5) is arranged inside the connecting column (3) along the outer side of the insertion hole (301).

10. The high temperature resistant, low smoke, halogen-free, flame retardant and fire resistant polyolefin cable according to claim 1, characterized in that: The winding layer (4) comprises an insulating tape (401), a metal tape (402) and a protective tape (403); the insulating tape (401) is wound around the outer surface of the connecting column (3); the metal tape (402) is wound around the outer side of the insulating tape (401); and the protective tape (403) is wound around the outer side of the metal tape (402).

Images