Low-temperature-resistant polyvinyl chloride fireproof cable

Abstract

The utility model discloses a low temperature resistant polyvinyl chloride fireproof cable, comprising a cable core, the cable core comprises a wire core and a filling layer, the outside of the cable core is provided with a belting layer, the outside of the belting layer is provided with an inner sheath, the outside of the inner sheath is provided with a composite low temperature resistant layer, and the composite low temperature resistant layer is attached to the inner sheath. The outer portion of the composite low-temperature-resistant layer is provided with the armor layer, the armor layer is attached to the composite low-temperature-resistant layer, the outer portion of the armor layer is provided with the composite fireproof layer, the composite fireproof layer is attached to the armor layer, the outer portion of the composite fireproof layer is provided with the outer sheath, and the outer sheath and the composite fireproof layer are formed through extrusion. The composite low-temperature-resistant layer and the composite fireproof layer are arranged in the fireproof cable, so that the low-temperature-resistant performance and the fireproof performance of the cable are improved, the cable inner core is protected when the cable is used in a low-temperature environment or a fire environment, the transmission efficiency of the cable is ensured, and the service life of the cable is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a low-temperature resistant polyvinyl chloride fireproof cable. Background Art

[0002] Cable is a device for transmitting electric energy or signals. It is usually a rope-like cable made of several or several groups of wires twisted together. Each group of wires is insulated from each other and often twisted around a center. The entire outer layer is covered with a highly insulating covering layer. It is used to connect circuits, electrical appliances, etc. Fireproof cable is a more common type of cable. At present, the most widely used fireproof cables are mainly UL series flame-retardant cables and flame-retardant low-smoke halogen-free cables.

[0003] The Chinese patent publication number is CN208208392U, and the authorization announcement date is December 7, 2018. The low-temperature fireproof cable includes a copper core, the number of the copper cores is multiple, and the outer wall of the copper core is fitted and wrapped with a low-temperature resistant insulator, the low-temperature resistant insulator is made of polyvinyl chloride material, and the outer end of the low-temperature resistant insulator is wrapped with a shielding layer, the shielding layer is made of aluminum-plastic composite material, and a filling layer is fixed between the low-temperature resistant insulator and the shielding layer, and the filling layer is filled with PP rope. The utility model has reasonable design and simple production. The insulation of the cable is increased by the low-temperature resistant insulator, and the low temperature resistance can be -50°C, and the flame retardant belt is made of glass fiber belt, which has the effect of heat preservation and heat insulation. The waterproof cover is made of polyurethane layer material, which has high mechanical strength and oxidation stability, flexibility, resilience, oil resistance, solvent resistance, water resistance and fire resistance, ensuring the performance of the entire cable.

[0004] Existing fireproof cables have poor cold resistance. When used in low temperature environments, the cable outer skin is damaged, which reduces the cable transmission efficiency, easily causes cable failure, reduces the cable service life, and cannot meet the use requirements. Utility Model Content

[0005] The purpose of the utility model is to provide a low-temperature resistant polyvinyl chloride fireproof cable to solve the problem mentioned in the above background technology that the existing fireproof cables have poor cold resistance, which causes the outer skin of the cable to be damaged when used in a low-temperature environment, reduces the cable transmission efficiency, easily causes cable failure, reduces the service life of the cable, and cannot meet the use requirements.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-temperature resistant polyvinyl chloride fireproof cable, comprising a cable core, the cable core comprising a wire core and a filling layer, two wire cores are provided, and the two wire cores are arranged side by side inside the cable core, a tape layer is provided on the outside of the cable core, and the tape layer is fitted with the cable core, an inner sheath is provided on the outside of the tape layer, and the inner sheath and the tape layer are formed by extrusion, a composite low-temperature resistant layer is provided on the outside of the inner sheath, and the composite low-temperature resistant layer is fitted with the inner sheath, an armor layer is provided on the outside of the composite low-temperature resistant layer, and the armor layer is fitted with the composite low-temperature resistant layer, a composite fireproof layer is provided on the outside of the armor layer, and the composite fireproof layer is fitted with the armor layer, an outer sheath is provided on the outside of the composite fireproof layer, and the outer sheath and the composite fireproof layer are formed by extrusion.

[0007] Preferably, the wire core includes a conductor, a shielding layer and an insulating layer, the conductor is formed by twisting a plurality of copper wires, and the cross-section of a single conductor is arranged in a hexagonal shape, the shielding layer is arranged outside the conductor, the insulating layer is arranged outside the shielding layer, and the conductor, the shielding layer and the insulating layer are formed by extrusion.

[0008] Preferably, a polyurethane layer is provided on the outside of the wire core, and the polyurethane layer is in contact with the insulating layer.

[0009] Preferably, the composite low-temperature resistant layer includes a polyester silk sleeve, an EPDM rubber layer and a rubber sponge layer, the EPDM rubber layer is arranged on the outside of the rubber sponge layer, and the rubber sponge layer is in contact with the inner sheath, the polyester silk sleeve is arranged on the outside of the EPDM rubber layer, and the polyester silk sleeve, the EPDM rubber layer and the rubber sponge layer are pressed together.

[0010] Preferably, the composite fireproof layer includes a first flame retardant tape, a ceramic silicone rubber layer and a second flame retardant tape, the ceramic silicone rubber layer is arranged on the outside of the second flame retardant tape, and the second flame retardant tape is bonded to the polyester silk sleeve, the first flame retardant tape is arranged on the outside of the ceramic silicone rubber layer, and the first flame retardant tape, the ceramic silicone rubber layer and the second flame retardant tape are pressed together.

[0011] Preferably, the filling layer is arranged at the gap between the two wire cores, and the filling layer is made of fireproof asbestos, and the inner sheath and the outer sheath are both made of polyvinyl chloride.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model device is provided with a composite low-temperature resistant layer and a polyurethane layer, and the composite low-temperature resistant layer is composed of a polyester silk sleeve, an EPDM rubber layer and a rubber sponge layer. The EPDM rubber layer has excellent low-temperature resistance and increases the low-temperature resistance effect inside the cable. The polyester silk sleeve and the rubber sponge layer can store the heat generated during the working process of the cable, and play a protective role when used in a low-temperature environment, and can play a role of heat preservation and heat insulation, ensuring that the cable can be used normally in a low-temperature environment. The polyurethane layer has good low-temperature resistance and heat insulation effects, improves the low-temperature resistance effect of the wire core, and further improves the low-temperature resistance of the cable.

[0014] The utility model device is provided with a composite fireproof layer, which is composed of a first flame retardant tape, a ceramic silicone rubber layer and a second flame retardant tape. The ceramic silicone rubber layer has excellent fireproof, flame retardant, low smoke and non-toxic properties. When burned, it can form a dense and hard ceramic layer, which can hinder the further spread of flames and play a better protective role in fire. The first flame retardant tape and the second flame retardant tape further improve the fireproof effect of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a cross-sectional view of the wire core of the utility model;

[0017] Figure 3 This is a structural diagram of the composite low-temperature resistant layer of the utility model;

[0018] Figure 4 This is a structural diagram of the composite fireproof layer of the utility model.

[0019] In the figure: 1. cable core; 2. wire core; 3. filling layer; 4. tape layer; 5. inner sheath; 6. composite low-temperature resistant layer; 7. armor layer; 8. composite fireproof layer; 9. outer sheath; 10. conductor; 11. shielding layer; 12. insulation layer; 13. polyurethane layer; 14. polyester silk sheath; 15. EPDM rubber layer; 16. rubber sponge layer; 17. first flame retardant tape; 18. ceramic silicone rubber layer; 19. second flame retardant tape. DETAILED DESCRIPTION

[0020] 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 of the embodiments.

[0021] See also Figure 1-4The utility model provides an embodiment: a low-temperature resistant polyvinyl chloride fireproof cable, comprising a cable core 1, the cable core 1 comprising a wire core 2 and a filling layer 3, two wire cores 2 are provided, and the two wire cores 2 are arranged side by side inside the cable core 1, a tape layer 4 is provided outside the cable core 1, and the tape layer 4 is fitted with the cable core 1, an inner sheath 5 is provided outside the tape layer 4, and the inner sheath 5 and the tape layer 4 are formed by extrusion, a composite low-temperature resistant layer 6 is provided outside the inner sheath 5, and the composite low-temperature resistant layer 6 is fitted with the inner sheath 5, an armor layer 7 is provided outside the composite low-temperature resistant layer 6, and the armor layer 7 is fitted with the composite low-temperature resistant layer 6, a composite fireproof layer 8 is provided outside the armor layer 7, and the composite fireproof layer 8 is fitted with the armor layer 7, an outer sheath 9 is provided outside the composite fireproof layer 8, and the outer sheath 9 and the composite fireproof layer 8 are formed by extrusion.

[0022] See also Figure 1 and Figure 2 The core 2 includes a conductor 10, a shielding layer 11 and an insulating layer 12. The conductor 10 is formed by twisting a plurality of copper wires, and the cross-section of a single conductor 10 is arranged in a hexagonal shape. The shielding layer 11 is arranged outside the conductor 10, and the insulating layer 12 is arranged outside the shielding layer 11. The conductor 10, the shielding layer 11 and the insulating layer 12 are formed by extrusion. The core 2 is formed by wrapping the shielding layer 11 and the insulating layer 12 on the outside of the conductor 10 in sequence, and the core 2 has shielding and insulating effects.

[0023] See also Figure 2 A polyurethane layer 13 is provided on the outside of the core 2, and the polyurethane layer 13 is in contact with the insulating layer 12. The polyurethane layer 13 has good low-temperature resistance and thermal insulation effects. The low-temperature resistance of the core 2 is improved by providing the polyurethane layer 13 on the outside of the core 2.

[0024] See also Figure 1 and Figure 3 The composite low-temperature resistant layer 6 includes a polyester sleeve 14, an EPDM rubber layer 15 and a rubber sponge layer 16. The EPDM rubber layer 15 is arranged on the outside of the rubber sponge layer 16, and the rubber sponge layer 16 is in contact with the inner sheath 5. The polyester sleeve 14 is arranged on the outside of the EPDM rubber layer 15, and the polyester sleeve 14, the EPDM rubber layer 15 and the rubber sponge layer 16 are pressed together as a whole. The polyester sleeve 14, the EPDM rubber layer 15 and the rubber sponge layer 16 form a composite layer. The polyester sleeve 14 and the rubber sponge layer 16 can store the heat generated during the working process of the cable, play a protective role when used in a low-temperature environment, and can play a role of heat preservation and heat insulation. The EPDM rubber layer 15 has excellent low-temperature resistance, increases the low-temperature resistance effect inside the cable, and ensures that the cable can be used normally in a low-temperature environment.

[0025] See also Figure 1 and Figure 4The composite fireproof layer 8 includes a first flame retardant tape 17, a ceramic silicone rubber layer 18 and a second flame retardant tape 19. The ceramic silicone rubber layer 18 is arranged on the outside of the second flame retardant tape 19, and the second flame retardant tape 19 is in contact with the polyester silk sleeve 14. The first flame retardant tape 17 is arranged on the outside of the ceramic silicone rubber layer 18, and the first flame retardant tape 17, the ceramic silicone rubber layer 18 and the second flame retardant tape 19 are pressed together as one. The first flame retardant tape 17, the ceramic silicone rubber layer 18 and the second flame retardant tape 19 form a composite layer. The ceramic silicone rubber layer 18 has excellent fireproof, flame retardant, low smoke, non-toxic and other characteristics. When burning, it can form a dense and hard ceramic layer, which can hinder the further spread of the flame and play a better protective role in the fire. The first flame retardant tape 17 and the second flame retardant tape 19 further improve the fireproof effect of the cable.

[0026] See also Figure 1 The filling layer 3 is arranged at the gap between the two wire cores 2, and the filling layer 3 is made of fireproof asbestos, and the inner sheath 5 and the outer sheath 9 are both made of polyvinyl chloride.

[0027] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low temperature resistant polyvinyl chloride fireproof cable, comprising a cable core (1), characterized in that: The cable core (1) comprises a wire core (2) and a filling layer (3), two wire cores (2) are provided, and the two wire cores (2) are arranged side by side inside the cable core (1), a tape layer (4) is provided outside the cable core (1), and the tape layer (4) is in contact with the cable core (1), an inner sheath (5) is provided outside the tape layer (4), and the inner sheath (5) and the tape layer (4) are formed by extrusion, and a composite low-temperature resistant layer (6) is provided outside the inner sheath (5). ), and the composite low-temperature resistant layer (6) is in contact with the inner sheath (5); an armor layer (7) is arranged outside the composite low-temperature resistant layer (6), and the armor layer (7) is in contact with the composite low-temperature resistant layer (6); a composite fireproof layer (8) is arranged outside the armor layer (7), and the composite fireproof layer (8) is in contact with the armor layer (7); an outer sheath (9) is arranged outside the composite fireproof layer (8), and the outer sheath (9) and the composite fireproof layer (8) are formed by extrusion.

2. A low temperature resistant polyvinyl chloride fireproof cable according to claim 1, characterized in that: The wire core (2) comprises a conductor (10), a shielding layer (11) and an insulating layer (12); the conductor (10) is formed by twisting a plurality of copper wires, and the cross-section of a single conductor (10) is arranged in a hexagonal shape; the shielding layer (11) is arranged outside the conductor (10); the insulating layer (12) is arranged outside the shielding layer (11); and the conductor (10), the shielding layer (11) and the insulating layer (12) are formed by extrusion.

3. A low temperature resistant polyvinyl chloride fireproof cable according to claim 2, characterized in that: A polyurethane layer (13) is provided on the outside of the wire core (2), and the polyurethane layer (13) is bonded to the insulating layer (12).

4. A low temperature resistant polyvinyl chloride fireproof cable according to claim 1, characterized in that: The composite low-temperature resistant layer (6) comprises a polyester filament sleeve (14), an EPDM rubber layer (15) and a rubber sponge layer (16); the EPDM rubber layer (15) is arranged outside the rubber sponge layer (16), and the rubber sponge layer (16) is in contact with the inner sheath (5); the polyester filament sleeve (14) is arranged outside the EPDM rubber layer (15), and the polyester filament sleeve (14), the EPDM rubber layer (15) and the rubber sponge layer (16) are pressed together as a whole.

5. The low temperature resistant polyvinyl chloride fireproof cable according to claim 1, characterized in that: The composite fireproof layer (8) comprises a first flame retardant tape (17), a ceramic silicone rubber layer (18) and a second flame retardant tape (19); the ceramic silicone rubber layer (18) is arranged outside the second flame retardant tape (19), and the second flame retardant tape (19) is in contact with the polyester silk sleeve (14); the first flame retardant tape (17) is arranged outside the ceramic silicone rubber layer (18), and the first flame retardant tape (17), the ceramic silicone rubber layer (18) and the second flame retardant tape (19) are pressed together as a whole.

6. A low temperature resistant polyvinyl chloride fireproof cable according to claim 1, characterized in that: The filling layer (3) is arranged at the gap between the two wire cores (2), and the filling layer (3) is made of fireproof asbestos, and the inner sheath (5) and the outer sheath (9) are both made of polyvinyl chloride.

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