Inorganic mineral insulation environment-friendly fireproof cable with corrugated copper sheath

Abstract

The utility model belongs to the technical field of cables, and discloses a corrugated copper sheath inorganic mineral insulation environment-friendly fireproof cable which comprises four cable cores located in the center, each cable core comprises a stranded copper conductor and a first mineral insulation layer wrapping the stranded copper conductor, and the four cable cores are jointly wrapped by a second mineral insulation layer. According to the cable, through the first mineral insulating layer, the second mineral insulating layer and the filling layers arranged in the gaps of the first mineral insulating layer and the second mineral insulating layer, the fire resistance of the cable is improved, meanwhile, the cable is good in flexibility and high in fireproof reliability, and the service life of the cable is prolonged. The safety fireproof performance grade of the building is fully achieved, and safety guarantee is provided for activity places with dense people.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and more specifically, to a braided copper sheathed inorganic mineral insulated environmentally friendly fireproof cable. Background Art

[0002] At present, the wire and cable industry refers to fire-resistant cables as a general term for cables that can pass the 180 minutes of fire exposure time specified in the GB / T19216.21-2003 standard, and the line remains intact after cooling for 15 minutes, or the C, W, and Z tests specified in the BS6387 standard. According to the structural characteristics, they can be divided into rigid and flexible cables.

[0003] The origin of the rigid structure fireproof cable was first proposed by Swiss engineer Arnold Francois Borel in the late 19th century. Its structure uses magnesium oxide inorganic material as the insulating medium and copper tube as the sheath, and is made through multiple drawing or rolling processes. Since both the insulation and the sheath are inorganic materials, it is called mineral insulated cable. This type of fireproof cable was put into production in France and the UK from 1934 to 1936, and then developed rapidly.

[0004] Mineral insulated cables are widely used in high-rise buildings, petrochemicals, airports, tunnels, ships, offshore oil platforms, aerospace, steel metallurgy, shopping centers, parking lots, hospitals, etc. However, it is an indisputable fact in the industry that mineral insulated cables are subject to great restrictions due to factors such as high engineering cost, voltage level of only 750V, small production specifications, short manufacturing length, high construction difficulty, and easy dampness at joints.

[0005] In order to solve the bottleneck problem of rigid fireproof cables, the research and development ideas of fireproof cables in the industry began to turn to flexible structures. According to JG / T313-2014, the YTTW (twisted copper conductor, inorganic insulation, braided copper sheath structure) type of flexible fireproof cables are designed. Compared with rigid fireproof cables, there are great improvements in flexibility, conductor cross-section, and manufacturing length. YTTW and RTTZ cables use longitudinal copper tape argon arc welding and then braided copper sheath technology to meet fireproof requirements. The cable structure has changed and solved the bottleneck of rigid fireproof cables. With the rapid development of my country's economy and society, electricity consumption has increased dramatically, the building volume has become larger and larger, and the building form has become increasingly complex. The research and development, production and manufacturing of new flexible fireproof cables with unlimited length, better flexibility, safety and reliability meet market demand. Utility Model Content

[0006] The utility model aims to provide a new type of flexible fireproof cable which has no limitation on manufacturing length, better flexibility, and is safe and reliable.

[0007] In order to achieve this object, the present application provides a braided copper sheathed inorganic mineral insulated environmentally friendly fireproof cable.

[0008] The present application provides a braided copper sheathed inorganic mineral insulated environmentally friendly fireproof cable adopts the following technical solution:

[0009] A textured copper sheathed inorganic mineral insulated environmentally friendly fireproof cable comprises four cable cores located in the central part, the cable cores comprise a twisted copper conductor and a first mineral insulation layer coated on the outside thereof, the outsides of the four cable cores are coated with a second mineral insulation layer together, the gaps between the four cable cores and the second mineral insulation layer are provided with filling parts, and the outside of the second mineral insulation layer is coated with a copper sheath.

[0010] Furthermore, the first mineral insulation layer and the second mineral insulation layer are both phlogopite mica wrapped tapes.

[0011] Furthermore, the thickness of the first mineral insulation layer is 0.5-1 mm.

[0012] Furthermore, the thickness of the second mineral insulation layer is 1-2 mm.

[0013] Furthermore, the filling part is made of magnesium hydroxide and inorganic fiber.

[0014] Furthermore, the copper sheath is provided with spiral patterns.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] The present application improves the fire resistance of the cable by providing a filling layer in the first mineral insulation layer, the second mineral insulation layer and the gap therebetween. At the same time, the cable has good flexibility and high fire resistance reliability, fully reaching the building safety and fire resistance performance level, and providing safety protection for crowded activity places. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a cross-sectional schematic diagram of the present application.

[0018] Description of the numbers in the figure:

[0019] 1. Cable core; 11. Twisted copper conductor; 12. First mineral insulation layer; 2. Second mineral insulation layer; 3. Filling part; 4. Copper sheath. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0021] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] Embodiment 1:

[0024] The present application is further described in detail below in conjunction with the accompanying drawings.

[0025] The embodiment of the present application discloses a braided copper sheathed inorganic mineral insulated environmentally friendly fireproof cable, comprising four cable cores 1 located in the central position, the cable core 1 comprising a twisted copper conductor 11 and a first mineral insulation layer 12 coated on the outside thereof, the outside of the four cable cores 1 being commonly coated with a second mineral insulation layer 2, a filling portion 3 being provided in the gap between the four cable cores 1 and the second mineral insulation layer 2, and the outside of the second mineral insulation layer 2 being coated with a copper sheath 4.

[0026] See also Figure 1 As a further preferred embodiment of this embodiment, the first mineral insulation layer 12 and the second mineral insulation layer 2 are both phlogopite mica wrapping tapes.

[0027] As a further preferred embodiment of this embodiment, the thickness of the first mineral insulation layer 12 is 0.5-1 mm.

[0028] As a further preference of this embodiment, the thickness of the second mineral insulation layer 2 is 1-2 mm.

[0029] As a further preferred embodiment of this embodiment, the material of the filling part 3 is magnesium hydroxide and inorganic fiber.

[0030] As a further preferred embodiment of this embodiment, the copper sheath 4 is provided with spiral ribs.

[0031] The finished cable is subjected to a combustion smoke density test, and the transmittance is greater than 60%.

[0032] The fire test of finished cables meets the corresponding requirements of fire test specified in BS standards, and meets three test methods and requirements: simple fire resistance (Class C - 950℃, 180min), fire resistance plus water spray (Class W - simple fire supply 650℃, 15min and fire supply plus water spray 650℃, 15min) and fire resistance plus mechanical impact (fire supply 950℃, 15min and impact test).

[0033] According to clause 7.5.5 of JG / T313-2014 standard, the copper sheath integrity test is carried out, and 50kpa-100kpa dry air is filled in, and the air pressure is maintained for 3 hours after it is balanced.

[0034] Flattening performance: According to Clause 7.5.3 of JG / T313-2014 standard, the cable must be flattened with a flattening coefficient of 0.90 and no cracks on the cable copper sheath. According to Clause 6.4.3 of JG / T313-2014 standard, the voltage test after flattening is carried out by applying a voltage of 1500V to the flattened cable for 15 minutes, and the cable is not broken down.

[0035] Bending performance, according to clause 7.5.2 of JG / T313-2014 standard, the cable bending wheel diameter is 500mm, the positive and negative bending is 180°, the cable copper sheath has no cracks, and after bending, the cable is applied with a voltage of 1500V for 15 minutes, and the bent cable is not broken down.

[0036] The implementation principle of the embodiment of the present application is a kind of inorganic mineral insulated environmentally friendly fireproof cable with a braided copper sheath: the conductor core adopts inorganic mineral insulation technology to prevent the insulation layer from failing due to the influence of fire or heat, and the design can ensure the effectiveness of the power transmission function of the cable when fire and heat occur; the inorganic mineral insulation material is non-toxic and odorless, and has excellent electrical properties, mechanical properties, thermal properties and chemical stability. There is no environmental harm during use. The second mineral insulation layer 2 is manufactured by a wrapping process. The copper sheath 4 adopts the longitudinal copper strip argon arc welding technology, and the spiral braiding is set after the manufacturing and processing of argon arc welding to increase the overall flexibility of the cable. The argon arc welding is reliable, and the waterproof and anti-corrosion performance is better. The present application improves the fire resistance of the cable through the first mineral insulation layer 12, the second mineral insulation 2 layer and the filling layer 3 set in the gap. At the same time, the cable has good flexibility and high fireproof reliability, fully reaching the building safety and fireproof performance level, and provides safety protection for crowded activity places.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A braided copper sheathed inorganic mineral insulated environmentally friendly fireproof cable, characterized in that: The invention comprises four cable cores (1) located at a central position, wherein the cable cores (1) comprise a stranded copper conductor (11) and a first mineral insulation layer (12) coated on the outside thereof, the outside of the four cable cores (1) are coated with a second mineral insulation layer (2), a filling portion (3) is provided in the gap between the four cable cores (1) and the second mineral insulation layer (2), and the outside of the second mineral insulation layer (2) is coated with a copper sheath (4).

2. The braided copper sheathed inorganic mineral insulated environmentally friendly fireproof cable according to claim 1, characterized in that: The first mineral insulation layer (12) and the second mineral insulation layer (2) are both phlogopite mica wrapped tapes.

3. The braided copper sheathed inorganic mineral insulated environmentally friendly fireproof cable according to claim 2, characterized in that: The thickness of the first mineral insulation layer (12) is 0.5-1 mm.

4. The braided copper sheathed inorganic mineral insulated environmentally friendly fireproof cable according to claim 2, characterized in that: The thickness of the second mineral insulation layer (2) is 1-2 mm.

5. The braided copper sheathed inorganic mineral insulated environmentally friendly fireproof cable according to claim 1, characterized in that: The material of the filling part (3) is magnesium hydroxide and inorganic fibers.

6. The braided copper sheathed inorganic mineral insulated environmentally friendly fireproof cable according to claim 1, characterized in that: The copper sheath (4) is provided with spiral patterns.

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