Flexible flame-retardant cable

Abstract

The utility model discloses a flexible flame-retardant cable, which comprises a cable core and an outer sheath wrapped on the outer layer of the cable core, the cable is a three-phase cable, and the cable core comprises a wire core and a filler; the wire core comprises a first phase line, a second phase line and a third phase line, the size and the structure of the first phase line are consistent with those of the second phase line, the third phase line further comprises a neutral line, and the neutral line is of a multi-copper-wire sparse winding structure. The power cable is reasonable in structural design, and has the following beneficial effects that the neutral line is arranged in the third phase line, and the neutral line adopts a structure of sparsely winding a plurality of copper wires, so that the neutral line can be directly used, the outer diameter of the power cable can be effectively reduced, and the burning of external flame can be effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a flexible flame-retardant cable. Background Art

[0002] With the increasing dependence of modern society on electricity, the applications of electrical equipment and power systems are becoming increasingly widespread. In many scenarios, such as industrial production, commercial buildings, transportation, etc., the usage of cables has increased significantly. However, when traditional cables face dangerous situations such as fires, they are prone to burning and releasing a large amount of toxic gases and smoke, which not only exacerbates the severity of the fire but may also cause casualties and property losses.

[0003] Therefore, people's attention to fire safety has gradually increased, and various buildings and facilities need to meet more stringent fire prevention standards and specifications to ensure the safety of personnel's lives and reduce losses caused by fires. The growing demand of users for cable products with high safety and reliability has prompted cable manufacturers to increase their R & D investment and develop flexible flame-retardant cables with more excellent performance. The market demand drives continuous R & D and innovation.

[0004] To address this challenge, developing a flexible flame-retardant cable has become an urgent task to meet the power and signal transmission requirements in these special environments. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a flexible flame-retardant cable to meet the power and signal transmission requirements in special environments.

[0006] To achieve the above purpose, the technical solution of the utility model provides a flexible flame-retardant cable, which includes a cable core and an outer sheath wrapped around the outer layer of the cable core. The cable is a three-phase cable, and the cable core includes a conductor core and a filler; the conductor core includes a first phase wire, a second phase wire, and a third phase wire. The first phase wire and the second phase wire have the same size and structure. The third phase wire further includes a neutral wire, and the structure of the neutral wire is a loose winding structure of multiple copper wires.

[0007] Further, the structure of the first phase wire and the second phase wire from the inside to the outside is successively a cooling tube, a phase conductor, a first insulating layer, and a first water-blocking tape.

[0008] Further, the structure of the first phase wire and the second phase wire further includes a first bulletproof wire; the phase conductor is a type 5 copper conductor, which is stranded by multiple copper wires; the first bulletproof wire is arranged inside the phase conductor and stranded together with the multiple copper wires; the cooling tube is a silicone rubber hose with an outer diameter of 8 mm and an inner diameter of 6 mm.

[0009] Furthermore, fillers are respectively arranged on both outer sides of each of the wire cores; the cable core further includes a support frame which divides the cable core into three parts, and each part includes a wire core and the fillers arranged on both sides of the wire core; the support frame is an aluminum alloy support frame, and the shape of the support frame is a triangular support frame. Starting from the center of the cable core, three branches of equal length extend outwards, and the angle between two adjacent branches is 120°.

[0010] Furthermore, the first insulating layer is a silicone rubber layer; the first water-blocking tape is a double-layer water-blocking tape wound in an overlapping manner; the filler is a flame-retardant high-temperature filling rope.

[0011] Furthermore, the structure of the outer sheath is, from the inside to the outside, a glass fiber tape, an oxygen barrier layer, a sheath, and a fiber protection layer, with the outer layer wrapping the inner layer.

[0012] Furthermore, the glass fiber tape is a glass fiber tape wound in an overlapping manner; the oxygen barrier layer is a ceramicized polyolefin fire protection sheath; the sheath is a low-smoke and halogen-free flame-retardant polyolefin sheath.

[0013] Furthermore, the structure of the third-phase wire is, from the inside to the outside, a third-phase wire conductor, a second insulating layer, a tape, a neutral wire, a copper tape, and a second water-blocking tape.

[0014] Furthermore, the structure of the third-phase wire further includes a second bulletproof wire; the third-phase wire conductor is a type-6 tinned copper conductor stranded by multiple strands of tinned copper wires; the second bulletproof wire is arranged inside the third-phase wire conductor and stranded together with the multiple strands of tinned copper wires.

[0015] Furthermore, the second insulating layer is a silicone rubber layer; the tape is a low-smoke and halogen-free high-flame-retardant tape; the copper tape is a copper tape reverse-binding structure; the second water-blocking tape is a double-layer water-blocking tape wound in an overlapping manner.

[0016] In summary, the device structure of the present utility model is reasonably designed. By applying the technical solution of the present utility model, the following beneficial effects are achieved: A neutral wire is arranged in the third-phase wire of the present utility model. The neutral wire structure adopts a loose winding structure of multiple copper wires, which can not only be directly used as a neutral wire, but also effectively reduce the outer diameter of the power cable while effectively preventing the burning of external flames. At the same time, an aluminum alloy support frame is provided to provide stable support for the cable, maintain the shape and structure stability of the cable, prevent the cable from deforming or being damaged during use, increase the ventilation space inside the cable, promote the conduction and dissipation of heat, improve the heat dissipation effect of the cable, and reduce the temperature of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic cross-sectional structure diagram of the flexible flame-retardant cable of the present utility model;

[0018] Description of reference numerals: 1 - cooling pipe; 2 - phase conductor; 3 - first bulletproof wire; 4 - first insulating layer; 5 - first water-blocking tape; 6 - support frame; 7 - filler; 8 - fiberglass tape; 9 - oxygen barrier layer; 10 - sheath; 11 - fiber protection layer; 501 - third phase conductor; 502 - second bulletproof wire; 503 - second insulating layer; 504 - tape; 505 - neutral line; 506 - copper tape; 507 - second water-blocking tape. Detailed implementation manners

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, but this does not constitute a limitation on the protection scope of the present invention.

[0020] In the present invention, for clearer description, the following is stated: When an observer observes facing the attached Figure 1 for observation, the front left side of the observer is set as the front, the rear right side of the observer is set as the rear, the rear left side of the observer is set as the left, the front right side of the observer is set as the right, the upper side of the observer is set as the upper, and the lower side of the observer is set as the lower. It should be noted that the terms "front end", "rear end", "left side", "right side", "middle part", "upper side", "lower side", etc. in the text indicate the orientation or position relationship based on the orientation or position relationship set in the accompanying drawings, and are only for facilitating the clear description of the present invention, rather than indicating or implying that the structures or components referred to must have a specific orientation or be constructed in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", and "fourth" are only used for the purpose of clear or simplified description, and cannot be understood as indicating or implying relative importance or quantity.

[0021] Generally, power transmission is in the three-phase four-wire mode. The three heads of the three-phase electricity are called phase conductors, and the three tails of the three-phase electricity are connected together to form the neutral line N, also called the "zero line". The reason for calling it the zero line is that there is no current passing through the neutral line at the moment of two-phase balance, and also because it is directly or indirectly connected to the ground, and the voltage with the ground is also close to zero. The ground wire is a line that reliably connects the shell of the device or electrical appliance to the ground, and is a good solution to prevent electric shock accidents. The live wire is also called the phase conductor, and it forms a power supply loop together with the zero line.

[0022] A neutral line 505 is provided in the third phase of the present invention. The structure of the neutral line 505 adopts a multi-strand copper wire loose winding structure, which can be directly used as the neutral line 505, and can effectively reduce the outer diameter of the power cable while effectively preventing the burning of the external flame.

[0023] See Figure 1, the present utility model provides a flexible flame-retardant cable, which includes a cable core and an outer sheath wrapped around the outer layer of the cable core. The cable is a three-phase cable, and the cable core includes a conductor core and a filler 7; the conductor core includes a first phase wire, a second phase wire, and a third phase wire. The sizes and structures of the first phase wire and the second phase wire are the same. The third phase wire further includes a neutral wire 505, and the structure of the neutral wire 505 is a loose winding structure of multiple copper wires, and the copper wires are wound around the outside of the third phase wire conductor 501.

[0024] The neutral wire 505 adopts a loose winding shielding structure of multiple copper wires, which can effectively reduce the outer diameter of the power cable while preventing the burning of external flames, ensuring its flame-retardant characteristics, and can also play a shielding effect to realize its signal transmission, especially more obvious in the occasion of medium and high frequency signals.

[0025] As a preferred embodiment of the present utility model, the structures of the first phase wire and the second phase wire from the inside to the outside are successively a cooling pipe 1, a phase wire conductor 2, a first insulating layer 4, and a first water-blocking tape 5. Specifically, the structures of the first phase wire and the second phase wire further include a first bulletproof wire 3; the phase wire conductor 2 is a type 5 copper conductor, which is stranded by multiple copper wires; the first bulletproof wire 3 is arranged inside the phase wire conductor 2 and stranded together with the multiple copper wires; the cooling pipe 1 is a silicone rubber hose with an outer diameter of 8 mm and an inner diameter of 6 mm.

[0026] A cooling pipe 1 is placed inside the phase wire conductor 2, and a silicone rubber hose with high compressive resistance, corrosion resistance, an outer diameter of 8 mm and an inner diameter of 6 mm is used for direct cooling to ensure the uniform cooling of the conductor core. According to the cable production and subsequent use conditions, the selection of the cooling pipe generally needs to consider factors such as strength, hardness, compressive resistance, liquid corrosion resistance, insulation performance, certain flexibility and bending without deformation, and certain cost performance.

[0027] The phase wire conductor 2 adopts type 5 copper wire, which is stranded by multiple copper wires and has good bending characteristics.

[0028] The first bulletproof wire 3 is arranged inside the phase wire conductor 2 and stranded together with the multiple copper wires that make up the phase wire conductor 2. The bulletproof wire is mainly made of multi-aryl fiber and has functions of high tensile strength and high pulling force; low elongation, high modulus, high breaking strength, high temperature resistance, high flammability, non-melting and non-flammable, only carbonizing, high chemical resistance, high stability, creep resistance, and excellent temperature resistance.

[0029] Specifically, fillers 7 are respectively arranged on both sides of the outside of each conductor core; the cable core further includes a support frame 6, and the support frame 6 divides the cable core into three parts, and each part includes a conductor core and fillers 7 arranged on both sides of the conductor core; the support frame 6 is an aluminum alloy support frame, and the shape of the support frame 6 is a triangular support frame, starting from the center of the cable core and extending three branches of the same length outward, and the angle between adjacent two branches is 120°.

[0030] The support frame 6 is an aluminum alloy support frame in the shape of a triangular support frame. This structure is beneficial for providing stable support inside the cable, maintaining the shape and structural stability of the cable, preventing the cable from deforming or being damaged during use, increasing the ventilation space inside the cable, promoting heat conduction and dissipation, improving the heat dissipation effect of the cable, and reducing the temperature of the cable. Moreover, it can prevent the spread of fire, divide the three cable cores into three parts, enable the cores to be distributed in different regions, improve the flame retardant performance of the cable, and reduce the risk of fire occurrence and spread.

[0031] Specifically, the first insulating layer 4 is a silicone rubber layer; the first water blocking tape 5 is a double-layer water blocking tape wound overlappingly; the filler 7 is a flame retardant high-temperature filling rope.

[0032] The first insulating layer 4 is extruded from silicone rubber, which can ensure good insulation resistance and electrical safety performance. At the same time, it has the good characteristics of being soft, having good heat aging resistance, long service life, and being low-smoke and halogen-free flame retardant.

[0033] The first water blocking tape 5 is wound overlappingly with a double-layer water blocking tape to protect the insulating layer from being damaged. At the same time, it has the characteristics of high expansion pressure, fast expansion speed, good gel stability, and good thermal stability, preventing the longitudinal spread of water and moisture, and thus playing a water blocking role.

[0034] The filler 7 is a flame retardant high-temperature filling rope, which is high-temperature resistant and has excellent flame retardant performance.

[0035] Specifically, the structure of the outer sheath from the inside to the outside is successively a fiberglass tape 8, an oxygen barrier layer 9, a sheath 10, and a fiber protection layer 11, with the outer layer wrapping the inner layer. Specifically, the fiberglass tape 8 is a fiberglass tape wound overlappingly; the oxygen barrier layer 9 is a ceramized polyolefin fire protection sheath; the sheath 10 is a low-smoke and halogen-free flame retardant polyolefin sheath.

[0036] The fiberglass tape 8 is wound overlappingly, and metal hydrate components are added to the material, which has high toughness, flame retardancy, and fire separation. The used material is a tape that integrates flame retardancy, heat absorption, and oxygen isolation, realizing high flame retardancy of the flame retardant cable and effectively improving the heat insulation characteristics and flame retardant performance of the cable.

[0037] The oxygen barrier layer 9 uses ceramized polyolefin fire protection sheath material. The ceramized polyolefin fire protection sheath can form a hard ceramic-like shell under flame burning or high-temperature conditions. The hard shell does not melt or drip, can resist water spray and mechanical vibration, and has a very good heat insulation and fire separation effect, which can ensure the smooth flow of power and information control in case of fire, and strive for precious time for personnel evacuation and fire fighting and rescue.

[0038] The sheath 10 uses low-smoke and halogen-free flame retardant polyolefin sheath material. A large amount of inorganic flame retardants are filled in the low-smoke and halogen-free flame retardant polyolefin sheath material. When they decompose at high temperature, they will decompose into water vapor, absorb the heat on the surface of the cable, and also reduce the temperature of the cable surface.

[0039] The fiber sheath 11 not only has excellent flame retardant properties, but also can maintain good structural stability under high temperature or even fire conditions due to its special high temperature resistant material characteristics.

[0040] As a preferred embodiment of the present utility model, the structure of the third phase line from the inside to the outside is successively the third phase line conductor 501, the second insulating layer 503, the tape 504, the neutral line 505, the copper tape 506, and the second water blocking tape 507. Specifically, the structure of the third phase line further includes the second bulletproof wire 502; the third phase line conductor 501 is the 6th kind of tinned copper conductor, which is stranded by multiple strands of tinned copper wires; the second bulletproof wire 502 is arranged inside the third phase line conductor 501 and stranded together with the multiple strands of tinned copper wires.

[0041] The third phase line conductor 501 adopts the 6th kind of tinned copper wire, which is stranded by multiple strands of tinned copper wires and has good bending characteristics. Tinned copper has good electrical conductivity; the surface coating of tinned copper can prevent the oxidation of copper, improve its anti-corrosion performance, has good mechanical properties, and can withstand various physical impacts and abrasions.

[0042] The second bulletproof wire 502 is stranded together with the third phase line conductor 501 inside the third phase line conductor 501. The bulletproof wire is mainly made of polyaryl fiber and has functions of high tensile strength and high pulling force; low elongation, high modulus, high breaking strength, high temperature resistance, high flammability, not melting and not supporting combustion but only carbonizing, and has high chemical resistance, high stability, creep resistance, and excellent temperature resistance, etc.

[0043] Specifically, the second insulating layer 503 is a silicone rubber layer; the tape 504 is a low-smoke and halogen-free high flame retardant tape; the copper tape 506 is a copper tape reverse binding structure; the second water blocking tape 507 is a double-layer water blocking tape wound overlappingly.

[0044] The second insulating layer 503 is extruded with silicone rubber to ensure good insulation resistance and electrical safety performance. At the same time, it has good characteristics of softness, good heat aging resistance, long service life, and low-smoke and halogen-free flame retardancy.

[0045] The tape 504 is wound overlappingly with a low-smoke and halogen-free high flame retardant tape to protect the insulating layer from damage, and can absorb a large amount of heat energy during combustion, and form a carbon shell layer to cut off air and prevent the further combustion of the cable, effectively playing the role of fire separation and oxygen isolation.

[0046] The copper tape 506 is tightly bound in the reverse direction, which can not only tie the copper wires tightly but also ensure the electrical continuity.

[0047] The second water-blocking tape 507 is overlapped and wrapped in a double-layer manner to protect the insulating layer from damage. At the same time, it has the characteristics of high expansion pressure, fast expansion speed, good gel stability, and good thermal stability, preventing the longitudinal spread of water and moisture, thereby playing a water-blocking role.

[0048] The beneficial effects of the present utility model are as follows:

[0049] 1. A silicone rubber hose is placed inside the phase conductor for direct cooling to ensure uniform cooling of the wire core. By adding a circulating cooling pipe to the conductor for cooling, the current-carrying capacity of the cable can be increased by 2 to 3 times while the cross-sectional area of the conductor remains unchanged. Under the same current-carrying capacity, the weight of the cable is reduced by 1 / 3, saving costs.

[0050] 2. Multiple strands of fine copper wires are twisted in the same direction and then re-twisted, greatly improving the flexibility of the cable. It has good flexibility and bending resistance. Even when subjected to frequent long-term bending, there will be no phenomenon of broken cores. At the same time, bulletproof wires are added for twisting together, further enhancing the toughness of the cable and significantly increasing the tensile breaking ability.

[0051] 3. By breaking the traditional way of extruding insulation for the phase line and neutral line separately, the neutral line and the shielding layer are combined into one. A structure of multiple copper wires loosely wound is adopted, which can be directly used as the neutral line. While effectively reducing the outer diameter of the power cable, it can also effectively prevent the burning of external flames, ensuring its flame retardant characteristics, and can also play a shielding effect to achieve signal transmission, especially more obvious when used in medium and high-frequency signal occasions.

[0052] 4. An aluminum alloy support frame is provided. This structure is beneficial to providing stable support inside the cable, maintaining the shape and structure stability of the cable, preventing the cable from deforming or being damaged during use, increasing the ventilation space inside the cable, promoting heat conduction and dissipation, improving the heat dissipation effect of the cable, and reducing the temperature of the cable. And it can prevent the spread of flames, dividing the three cable cores into three parts, making the cores distributed in different areas, improving the flame retardant performance of the cable, and reducing the risk of fire occurrence and spread. To a greater extent, it ensures the property safety of the people.

[0053] 5. A fiber protection layer is provided. It not only has excellent flame retardant performance, but also due to its special high-temperature resistant material characteristics, it can maintain good structural stability even in high-temperature or fire environments, and has excellent wear resistance.

[0054] The above is the preferred implementation manner of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can still be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A flexible flame-retardant cable, comprising a cable core and an outer sheath wrapped around the outer layer of the cable core, characterized in that: The cable is a three-phase cable, and the cable core includes a conductor core and a filler; the conductor core includes a first phase wire, a second phase wire, and a third phase wire. The first phase wire and the second phase wire are the same in size and structure. The third phase wire further includes a neutral wire, and the structure of the neutral wire is a structure in which multiple copper wires are loosely wound.

2. The flexible flame-retardant cable according to claim 1, wherein: The structure of the first phase wire and the second phase wire from the inside to the outside is successively a cooling pipe, a phase wire conductor, a first insulating layer, and a first water-blocking tape.

3. The flexible flame-retardant cable according to claim 2, characterized in that: The structure of the first phase wire and the second phase wire further includes a first bulletproof wire; the phase wire conductor is a type 5 copper conductor, which is stranded by multiple copper wires; the first bulletproof wire is arranged inside the phase wire conductor and stranded together with the multiple copper wires; the cooling pipe is a silicone rubber hose with an outer diameter of 8 mm and an inner diameter of 6 mm.

4. The flexible flame-retardant cable according to claim 3, characterized in that: Fillers are respectively arranged on both outer sides of each conductor core; the cable core further includes a support frame, which divides the cable core into three parts, and each part includes a conductor core and fillers arranged on both sides of the conductor core; the support frame is an aluminum alloy support frame, and the shape of the support frame is a triangular support frame. Starting from the center of the cable core, three branches of the same length extend outwards, and the angle between adjacent two branches is 120°.

5. The flexible flame-retardant cable according to claim 4, characterized in that: The first insulating layer is a silicone rubber layer; the first water-blocking tape is a double-layer water-blocking tape wound in an overlapping manner; the filler is a flame-retardant high-temperature filling rope.

6. The flexible flame-retardant cable according to any one of claims 1-5, characterized in that: The structure of the outer sheath from the inside to the outside is successively a glass fiber tape, an oxygen barrier layer, a sheath, and a fiber protection layer, and the outer layer wraps the inner layer.

7. The flexible flame-retardant cable according to claim 6, characterized in that: The glass fiber tape is a glass fiber tape wound in an overlapping manner; the oxygen barrier layer is a ceramized polyolefin fireproof sheath; the sheath is a low-smoke and halogen-free flame-retardant polyolefin sheath.

8. The flexible flame-retardant cable according to claim 1 or 2 or 3 or 4 or 5 or 7, characterized in that: The structure of the third phase wire from the inside to the outside is successively a third phase wire conductor, a second insulating layer, a tape, a neutral wire, a copper tape, and a second water-blocking tape.

9. The flexible flame-retardant cable according to claim 8, wherein: The structure of the third phase wire further includes a second bulletproof wire; the third phase wire conductor is a type 6 tin-plated copper conductor, which is stranded by multiple tin-plated copper wires; the second bulletproof wire is arranged inside the third phase wire conductor and stranded together with the multiple tin-plated copper wires.

10. The flexible flame-retardant cable according to claim 8, wherein: The second insulating layer is a silicone rubber layer; the tape is a low-smoke and halogen-free high-flame-retardant tape; the copper tape is a copper tape reverse lashing structure; the second water-blocking tape is a double-layer water-blocking tape wound in an overlapping manner.

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