Mineral fireproof cable

Abstract

The utility model discloses a mineral fireproof cable, which relates to the technical field of cables, and comprises a cable core, four groups of twisted wire cores are arranged in the cable core, each wire core is composed of a conductor, an insulation isolation layer and a fireproof enhancement layer, a mineral insulation layer is arranged outside the cable core, and the fireproof enhancement layer is arranged outside the mineral insulation layer. The mineral insulation layer is composed of a mineral insulation base material, a reinforcing layer and a fireproof coating, the fireproof isolation layer is arranged outside the mineral insulation layer and composed of a fireproof bonding layer and a fireproof isolation belt, and the metal sheath layer is arranged outside the fireproof isolation layer and composed of a fireproof bonding layer and a fireproof isolation belt. The metal sheath layer is composed of a metal foil layer, a metal braid layer and an outer sheath. The problems that the cable is insufficient in structural stability, electromagnetic shielding and mechanical strength at extreme high temperature are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field, concretely is a mineral fireproof cable. BACKGROUND

[0002] Cables, as the "blood vessels" of modern power and signal transmission, are the key link connecting various electrical devices and systems. It is composed of conductive core, insulation layer and protective layer, etc. It can safely and efficiently transmit power or signal. The conductive core is responsible for conducting current, the insulation layer ensures the current flow in the specified path, prevents electric shock and short circuit, and the protective layer resists the influence of external environment such as moisture, corrosion or mechanical damage, and ensures the long-term stable operation of the cable. Cables are widely used in power, communication, transportation, construction and other fields, and are one of the indispensable infrastructure in modern society.

[0003] For example, the Chinese authorized patent "fireproof cable" with publication number CN209571256U includes a conductive cable core and an aluminum foil layer outside the conductive cable core. The aluminum foil layer is sequentially provided with aluminum foil, first flame-retardant layer, elastic buffer layer, phase change temperature control layer, second flame-retardant layer and wear-resistant layer. Through the above scheme, the first flame-retardant layer can prevent the combustion of the outer structure when the temperature of the aluminum foil rises, and the elastic buffer layer can ensure the flexibility and pressure capacity of the cable. The phase change temperature control layer can change phase when the external or internal temperature rises or falls, and absorb heat during the phase change.

[0004] The above-mentioned prior art has certain fireproof effect, but its fireproof performance and structural stability may still be insufficient in extreme high temperature environment, and the requirements for electromagnetic shielding and mechanical strength may not fully meet the specific high requirement scene. Especially for the cable demand that needs to maintain insulation performance for a long time in high temperature, effectively prevent fire spread, and have excellent electromagnetic shielding and strong mechanical strength. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a mineral fireproof cable to solve the problem of insufficient structural stability, electromagnetic shielding and mechanical strength of the cable in extreme high temperature environment as proposed in the above background technology.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: a mineral fireproof cable, including the cable core, the inside of cable core is equipped with four groups of stranded wire core, the wire core is composed of conductor, insulation isolation layer and fireproof reinforcing layer, the outside of cable core is provided with mineral insulation layer, the mineral insulation layer is composed of mineral insulation base material, reinforcing layer and fireproof coating, the outside of mineral insulation layer is provided with fireproof isolation layer, the fireproof isolation layer is composed of fireproof bonding layer and fireproof isolation band, the outside of fireproof isolation layer is provided with metal sheath layer, the metal sheath layer is composed of metal foil layer, metal braiding layer and outer sheath.

[0007] Preferably, the conductor is twisted by multiple copper wires, the insulation isolation layer is formed on the outside of the conductor through a pressing process, and the fireproof reinforcing layer is wrapped on the outside of the insulation isolation layer in multiple layers.

[0008] Preferably, the edges of the wire core and the cable core are provided with annularly distributed reinforcing cores.

[0009] Preferably, the mineral insulation base material is fixed on the outside of the cable core by an adhesive, the reinforcing layer is coated on the outside of the mineral insulation base material, and the fireproof coating is sprayed on the outer wall of the reinforcing layer.

[0010] Preferably, the fireproof bonding layer is adhered to the outside of the mineral insulation layer, and the fireproof isolation band is spirally wound on the outside of the fireproof bonding layer.

[0011] Preferably, the metal foil layer is coated on the outside of the fireproof isolation layer, the metal braiding layer is woven in a mesh shape on the outside of the metal foil layer, and the outer sheath is extruded on the outside of the metal braiding layer.

[0012] Preferably, the wire core filling layer is arranged at the gap between the wire core and the reinforcing core.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1. The multilayer design of the composite mineral insulation layer enables the cable to maintain insulation performance for a longer time at high temperature, the combination of the inner base material and the outer coating forms a double fireproof barrier, effectively prevents the spread of fire, the addition of the intermediate reinforcing layer significantly improves the mechanical strength of the insulation layer, so that the cable can resist external impact and extrusion, and the cable can be protected from damage, the service life of the cable is prolonged, the outer mineral fireproof coating has excellent flame retardant performance, can quickly form a fireproof barrier in a fire to prevent further spread of the fire, and can help reduce the loss of the fire and protect the safety of personnel and property.

[0015] 2、The multi-layer design of the composite fireproof isolation layer forms an effective fireproof barrier, can prevent the transmission of flame and high temperature, the inner adhesive layer ensures the close adhesion between the layers, the outer isolation belt provides flame retardant and heat insulation effects, the materials used by the fireproof isolation layer all have very high fire resistance, can maintain structural stability under high temperature, prolong the fire resistance time of the cable, which helps to gain more time for personnel evacuation and fire extinguishing work, reduces the loss caused by fire, and at the same time has certain mechanical strength, can resist external force impact and extrusion, and helps to protect the cable from damage in the fire and maintain the stability of electrical connection.

[0016] 3、The utility model discloses a composite metal sheath layer is equipped with, and the metal foil layer selects aluminum foil, and its good conductivity makes the cable can effectively resist external electromagnetic interference, as the first line of defense of electromagnetic shielding, ensures the clearness and stability of signal transmission. Meanwhile, the ductility of aluminum foil endows the cable with certain mechanical strength, and enhances its resistance to external force impact. Secondly, the metal braid layer adopts fine stainless steel wire to form a dense metal mesh, which not only further enhances the mechanical strength of the cable and effectively prevents direct damage of external objects to the cable, but also provides more excellent electromagnetic shielding effect, ensuring the stable operation of the cable in complex environment. Finally, the outer sheath selects crosslinked polyethylene material, and its excellent weather resistance and wear resistance provide long-term protection for the cable, so that the cable can maintain stable performance under various harsh conditions and prolong the service life. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the perspective view of the utility model;

[0018] Figure 2 It is the internal structure schematic view of the utility model;

[0019] Figure 3 It is the mineral insulation layer structure schematic view of the utility model;

[0020] Figure 4 It is the fireproof isolation layer structure schematic view of the utility model;

[0021] Figure 5 It is the metal sheath layer structure schematic view of the utility model.

[0022] In the drawing: 1, cable core; 2, wire core; 21, conductor; 22, insulation isolation layer; 23, fireproof reinforcing layer; 3, reinforced core; 4, mineral insulation layer; 41, mineral insulation base material; 42, reinforcing layer; 43, fireproof coating; 5, fireproof isolation layer; 51, fireproof adhesive layer; 52, fireproof isolation belt; 6, metal sheath layer; 61, metal foil layer; 62, metal braid layer; 63, outer sheath; 7, wire core filling layer. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0024] Please refer to Figures 1-5 The utility model provides an embodiment: a kind of mineral fireproof cable, the inside of cable core 1 is equipped with four groups of stranding wire core 2, wire core 2 is composed of conductor 21, insulating isolation layer 22 and fireproof reinforcing layer 23, conductor 21 is stranding by multiple copper wire, insulating isolation layer 22 is formed in the outside of conductor 21 by pressing process, fireproof reinforcing layer 23 is wrapped in the outside of insulating isolation layer 22 in multiple layers, the edge of wire core 2 is equipped with annular distribution reinforced core 3 between cable core 1, conductor 21 uses high-purity copper wire as center conductor, ensure good conductivity and current carrying capacity;Insulating isolation layer 22 is aluminum oxide powder, is formed in the outside of conductor by pressing process, has very high fire resistance and temperature resistance, can keep insulating property under high temperature, prevent current leakage;Fireproof reinforcing layer 23 is ceramic fiber paper, enhances the fireproof performance of cable, provides additional heat protection;

[0025] The combination of mineral insulation layer and fireproof reinforcing layer enables the cable to maintain insulating property and structural integrity under extreme high temperature, effectively prevents fire spreading, the mineral insulation material is smokeless and non-toxic, does not release harmful gas during combustion, is safe to personnel and environment, the fireproof reinforcing layer provides additional heat protection, further improves the safety of cable, and the stranding wire core design increases the flexibility of cable, making it easier to bend and install.

[0026] Please refer to Figure 1 、 Figure 2 And Figure 3 The outside of cable core 1 is provided with mineral insulation layer 4, which is composed of mineral insulation base material 41, reinforcing layer 42 and fireproof coating 43, the mineral insulation base material 41 is fixed on the outside of cable core 1 by adhesive, the reinforcing layer 42 is coated on the outside of mineral insulation base material 41, and the fireproof coating 43 is sprayed on the outer wall of reinforcing layer 42, the mineral insulation base material 41 adopts magnesium oxide, which has excellent fire resistance and temperature resistance, and can maintain stable insulating property under high temperature;The reinforcing layer 42 is made of aluminum silicate fiber, which can enhance the mechanical strength of the insulation layer and prevent it from breaking under external force or high temperature;The fireproof coating 43 is a special fire-resistant mortar, which can form a hard fireproof barrier to prevent fire spreading.

[0027] Please refer to Figure 1 、 Figure 2 And Figure 4, the outer part of the mineral insulation layer 4 is provided with a fireproof isolation layer 5, the fireproof isolation layer 5 is composed of a fireproof adhesive layer 51 and a fireproof isolation belt 52, the fireproof adhesive layer 51 is adhered to the outer part of the mineral insulation layer 4, the fireproof isolation belt 52 is spirally wound on the outer part of the fireproof adhesive layer 51, the fireproof adhesive layer 51 is a high-temperature adhesive fireproof glue, which can ensure the close fit between the mineral insulation layer and the fireproof isolation layer, and prevent the separation between the layers during fire; the fireproof isolation belt 52 is a glass fiber cloth, which has excellent flame retardance and heat insulation.

[0028] Please refer to Figure 1 , Figure 2 and Figure 5 , the outer part of the fireproof isolation layer 5 is provided with a metal sheath layer 6, the metal sheath layer 6 is composed of a metal foil layer 61, a metal woven layer 62 and an outer sheath 63, the metal foil layer 61 is wrapped on the outer part of the fireproof isolation layer 5, the metal woven layer 62 is woven in a mesh shape on the outer part of the metal foil layer 61, and the outer sheath 63 is extruded on the outer part of the metal woven layer 62, the metal foil layer 61 is an aluminum foil, which has good electrical conductivity and ductility, can serve as the first line of defense for electromagnetic shielding, and at the same time provides certain mechanical strength; the metal woven layer 62 is a metal mesh composed of fine stainless steel wires, which enhances the mechanical strength of the cable, prevents direct damage to the cable by external objects, and at the same time provides better electromagnetic shielding effect; the outer sheath 63 is made of crosslinked polyethylene, which has excellent weather resistance and wear resistance, provides long-term protection for the cable, and enables the cable to maintain stable performance under various harsh conditions.

[0029] Please refer to Figure 2 , the space between the core 2 and the reinforced core 3 is provided with a core filling layer 7, the core filling layer is mineral wool, which can fix the position of the core, prevent the core from shifting when the cable is bent or subjected to external force, and at the same time increase the overall flame retardance of the cable, the stranded core design can increase the flexibility of the cable, making it easier to bend and install.

[0030] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of equivalency of the claims. Any reference signs in the claims should not be construed as limiting the claims to which they belong.

Claims

1. A mineral fire-resistant cable comprising a cable core (1), characterized in that: The inside of the cable core (1) is provided with four groups of twisted wire cores (2), which are composed of conductors (21), insulation isolation layers (22) and fireproof reinforcing layers (23), the outside of the cable core (1) is provided with a mineral insulation layer (4), which is composed of a mineral insulation base material (41), a reinforcing layer (42) and a fireproof coating (43), the outside of the mineral insulation layer (4) is provided with a fireproof isolation layer (5), which is composed of a fireproof adhesive layer (51) and a fireproof isolation belt (52), the outside of the fireproof isolation layer (5) is provided with a metal sheath layer (6), which is composed of a metal foil layer (61), a metal woven layer (62) and an outer sheath (63).

2. A mineral fire resistant cable according to claim 1, characterized in that: The conductor (21) is twisted by multiple strands of copper wire, the insulation isolation layer (22) is formed on the outside of the conductor (21) through a pressing process, and the fireproof reinforcing layer (23) is wrapped outside the insulation isolation layer (22) in multiple layers.

3. A mineral fire resistant cable according to claim 1, characterized in that: The edges of the wire core (2) and the cable core (1) are provided with a reinforcing core (3) distributed in a ring shape.

4. A mineral fire resistant cable according to claim 1, characterized in that: The mineral insulation base material (41) is fixed on the outside of the cable core (1) by an adhesive, the reinforcing layer (42) is coated on the outside of the mineral insulation base material (41), and the fireproof coating (43) is sprayed on the outer wall of the reinforcing layer (42).

5. A mineral fire resistant cable as claimed in claim 1, characterized in that: The fireproof adhesive layer (51) is adhered to the outside of the mineral insulation layer (4), and the fireproof isolation belt (52) is spirally wound outside the fireproof adhesive layer (51).

6. A mineral fire resistant cable according to claim 1, characterized in that: The metal foil layer (61) is wrapped outside the fireproof isolation layer (5), the metal woven layer (62) is woven in a mesh shape outside the metal foil layer (61), and the outer sheath (63) is extruded outside the metal woven layer (62).

7. A mineral fire resistant cable according to claim 3, characterized in that: The wire core filling layer (7) is arranged at the gap between the wire core (2) and the reinforcing core (3). The conductor (21) is twisted by multiple strands of copper wire, the insulation isolation layer (22) is formed on the outside of the conductor (21) through a pressing process, and the fireproof reinforcing layer (23) is wrapped outside the insulation isolation layer (22) in multiple layers. The edges of the wire core (2) and the cable core (1) are provided with a reinforcing core (3) distributed in a ring shape. The mineral insulation base material (41) is fixed on the outside of the cable core (1) by an adhesive, the reinforcing layer (42) is coated on the outside of the mineral insulation base material (41), and the fireproof coating (43) is sprayed on the outer wall of the reinforcing layer (42). The fireproof adhesive layer (51) is adhered to the outside of the mineral insulation layer (4), and the fireproof isolation belt (52) is spirally wound outside the fireproof adhesive layer (51). The metal foil layer (61) is wrapped outside the fireproof isolation layer (5), the metal woven layer (62) is woven in a mesh shape outside the metal foil layer (61), and the outer sheath (63) is extruded outside the metal woven layer (62). The wire core filling layer (7) is arranged at the gap between the wire core (2) and the reinforcing core (3).

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