A mineral insulated B1 flame retardant fireproof cable

Abstract

The invention discloses a mineral insulated B1-class flame-retardant fireproof cable, which relates to the technical field of cables, including four cores distributed in a circular array, a plurality of spaced spacing positioning components are arranged between the four cores along the length direction, each spaced spacing positioning component includes two groups of card units distributed in a cross, and each group of card units includes two mutually engaged plug-ins; each plug-in has two arc-shaped portions respectively adapted to two adjacent cores and an elastic plate inserted between the two adjacent cores, the part connected between the two arc-shaped portions forms a spaced spacing portion for spacing the two adjacent cores, the elastic plate is fixedly connected to the spaced spacing portion, both sides of the end of the elastic plate are provided with barbed teeth, and the two plug-ins of each card unit are engaged by the barbed teeth; an oxygen barrier layer is filled between each core and the spaced spacing positioning and the surrounding side, and the surrounding side of the oxygen barrier layer is coated with an outer sheath. The invention can increase the oxygen-insulating and flame-retardant ability of the cable, and the oxygen barrier layer is round and uniform after extrusion, and the cable quality and color are excellent after cabling.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a mineral insulated B1 grade flame retardant and fireproof cable. Background Art

[0002] Flame-retardant and fire-proof cables refer to cables that can maintain safe operation for a certain period of time under flame burning. They are suitable for fire protection lines, mining industry, nuclear industry and other places, and are often used in alarm lines that exceed the predetermined temperature.

[0003] The patent application with publication number CN114171247A discloses "a ceramic polyolefin insulated highly flame-retardant and fire-proof cable and its preparation process", which includes a conductor, multiple conductors are interconnected, the outer surfaces of the multiple conductors are wrapped with fire-resistant mica tape, the surface of the fire-resistant mica tape is wrapped with an insulating layer, the four insulating layers are arranged in four equal parts with the intersection of the axis connection as the center of the circle, and the outer surfaces of the four insulating layers are filled with a flame-retardant filling layer; the outer surface of the flame-retardant filling layer is wrapped with an inner lining layer, the outer surface of the inner lining layer is wrapped with an aluminum alloy belt armoring layer, the outer surface of the aluminum alloy belt armoring layer is wrapped with a Taokai ceramic oxygen insulation layer, the outer surface of the Taokai ceramic oxygen insulation layer is wrapped with a glass fiber tape, and the outer surface of the glass fiber tape is wrapped with a low-smoke halogen-free outer sheath. By setting up the inner lining layer and the Taokai ceramic oxygen isolation layer, it has excellent insulation, excellent fire resistance, water insulation, good heat insulation and temperature insulation performance; high strength, good vibration resistance, excellent high and low temperature resistance; good process performance, no toxic gas release during combustion, and excellent safety and environmental protection; simple process, high production efficiency, can greatly reduce processing costs.

[0004] In the prior art such as the above-mentioned patent, when multiple cores are gathered together to form a cable, adjacent cores are tightly fitted together. In the subsequent process of extruding and coating the oxygen insulation layer of each core, it will be difficult for the oxygen insulation layer to be fully filled into the central cavity between the cores and between adjacent cores, resulting in a lack of oxygen insulation and filling between the cores, and the flame retardant ability of the cable is insufficient. In addition, sometimes the cores may deviate when the oxygen insulation layer is extruded, the oxygen insulation layer may not be rounded, and the cable may be unevenly rounded after cabling, and there may even be a defective situation in which the oxygen insulation layer does not completely cover the partial cores. Summary of the invention

[0005] The object of the present invention is to provide a mineral insulated B1 class flame retardant and fireproof cable to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mineral insulated B1 grade flame retardant fireproof cable, comprising four cores distributed in a circular array, a plurality of spacing positioning components distributed at intervals are arranged between the four cores along the length direction, each of the spacing positioning components comprises two groups of card units distributed in a cross, each group of card units comprises two mutually engaging plug-ins; each of the plug-ins has two arc portions respectively adapted to two adjacent cores and an elastic plate inserted between the two adjacent cores, the connecting portion between the two arc portions forms a spacing portion spacing the two adjacent cores, the elastic plate is fixedly connected to the spacing portion, both sides of the end of the elastic plate are provided with barbed teeth, and the two plug-ins of each card unit are engaged by the barbed teeth; an oxygen insulation layer is filled between each core and the spacing positioning and on the surrounding side, and the surrounding side of the oxygen insulation layer is covered with an outer sheath.

[0007] Furthermore, the curvature of the cross section of each arc-shaped portion is between 1 / 4π and 3 / 4π.

[0008] Furthermore, along the length direction of the wire core, half of the distance portion is connected to the elastic plate, and the other half corresponds to the gap, and the elastic plate of one card-matching unit of the distance positioning assembly is located in the gap of another card-matching unit.

[0009] Furthermore, the plug is provided with an open cavity between the two arc-shaped portions and a plurality of channels distributed in parallel, each channel connecting the open cavity and the space between the four wire cores, and a portion of the channels corresponding to the elastic plate extends on the elastic plate in the direction of the barbed teeth.

[0010] Furthermore, along the length direction of the wire core, openings communicating with the open cavity are formed at both ends of the plug.

[0011] Furthermore, the distance between two adjacent support positioning components is 200mm-400mm.

[0012] Furthermore, each of the wire cores includes, from inside to outside, a sheathed conductor, an insulating layer, an aluminum sheath and an isolation sheath.

[0013] Furthermore, the installation steps of the support positioning assembly are as follows: align the two plug-ins of one of the card units in opposite directions and insert them into the two opposite gaps of the four cores and further press them so that the barbed teeth are engaged; stagger the positions of the above-mentioned card units in the length direction of the cores, align the two plug-ins of the other card unit in opposite directions and insert them into the other two opposite gaps of the four cores and further press them so that the barbed teeth are engaged; block the card assembly located in the front side of the forward direction of the cores, and the forward cores drive the card assembly located in the rear side of the forward direction to move synchronously, so that the two card assemblies are forked together, and each support part spreads the distance between the same section of the four cores in pairs, and then releases the blocked card assembly.

[0014] In the above technical scheme, the present invention provides a mineral insulated B1 grade flame retardant and fireproof cable, and the spacing positioning components arranged at intervals can stretch the spacing between the four cores and maintain the spacing so that the cores remain relatively stable, so that when the oxygen insulation layer is extruded, the oxygen insulation material can be squeezed into the central cavity between the four cores and the spacing between the adjacent cores from the spacing between the adjacent cores, so that the space between the cores and the periphery can be filled and wrapped by the oxygen insulation layer, thereby increasing the oxygen insulation and flame retardant ability of the cable, and because the spacing positioning components position and maintain the cores, the oxygen insulation layer is round and uniform after extrusion, which can ensure that the oxygen insulation layer fully covers the cores, and the cable has excellent quality and color after cabling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1-3 A schematic diagram of a cross-section structure provided for an embodiment of the present invention;

[0017] Figure 4-5 A schematic diagram of the internal structure provided by an embodiment of the present invention;

[0018] Figure 6-7 A schematic diagram of the structure of a spacing positioning assembly provided in an embodiment of the present invention;

[0019] Figure 8 A schematic diagram of the structure of a card pairing unit provided in an embodiment of the present invention;

[0020] Figure 9-10 A schematic diagram of the structure of a plug-in provided in an embodiment of the present invention;

[0021] Figure 11-12 A schematic diagram of the structure of the support spacing and positioning assembly provided in an embodiment of the present invention during installation.

[0022] Description of reference numerals:

[0023] 1. Wire core; 1.1. Conductor; 1.2. Insulation layer; 1.3. Aluminum sleeve; 1.4. Isolation sleeve; 2. Plug-in; 2.1. Arc-shaped portion; 2.2. Spacing portion; 2.3. Elastic plate; 2.4. Barbed teeth; 2.5. Open cavity; 2.6. Channel; 2.7. Opening; 3. Oxygen barrier layer; 4. Outer sheath. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] See also Figure 1-12 A mineral insulated B1-class flame-retardant fireproof cable provided in an embodiment of the present invention comprises four cores 1 distributed in a circular array. Specifically, each core 1 comprises a conductor 1.1, an insulating layer 1.2, an aluminum sleeve 1.3 and an isolation sleeve 1.4, which are fitted together from the inside to the outside. A plurality of spaced-apart spacing positioning components are arranged between the four cores 1 along the length direction. Preferably, the spacing between two adjacent spacing positioning components is 200mm-400mm. Each of the spacing positioning components comprises two groups of cross-distributed card units, each group of card units comprises two mutually engaging plug-ins 2; each of the plug-ins 2 has There are two arc-shaped portions 2.1 respectively adapted to two adjacent wire cores 1 and an elastic plate 2.3 inserted between the two adjacent wire cores 1. Specifically, the cross-sectional curvature of each arc-shaped portion 2.1 is between 1 / 4π-3 / 4π, and the connecting portion between the two arc-shaped portions 2.1 forms a spacing portion 2.2 spacing the two adjacent wire cores 1. The elastic plate 2.3 is fixedly connected to the spacing portion 2.2. Both sides of the end of the elastic plate 2.3 are provided with barbed teeth 2.4, and the two plug-ins 2 of each card unit are engaged by the barbed teeth 2.4; an oxygen insulation layer 3 is filled between each wire core 1 and the spacing positioning and on the surrounding side, and the surrounding side of the oxygen insulation layer 3 is covered with an outer sheath 4.

[0026] In the above technical scheme, the present invention provides a mineral insulated B1 grade flame retardant and fireproof cable, and the spacing positioning components arranged at intervals can stretch the spacing between the four cores 1 and maintain the spacing so that the cores 1 remain relatively stable, so that when the oxygen insulation layer 3 is extruded, the oxygen insulation material can be squeezed into the central cavity between the four cores 1 and the spacing between the adjacent cores 1 from the spacing between the adjacent cores 1, so that the space between the cores 1 and the periphery can be filled and wrapped by the oxygen insulation layer 3, thereby increasing the oxygen insulation and flame retardant ability of the cable, and because the spacing positioning components position and maintain the cores 1, the oxygen insulation layer 3 is round and uniform after extrusion, which can ensure that the oxygen insulation layer 3 fully covers the cores 1, and the quality and color of the cable after cabling are excellent.

[0027] As a preferred technical solution, along the length direction of the wire core 1, half of the distance portion 2.2 is connected to the elastic plate 2.3, and the other half corresponds to the gap. The elastic plate 2.3 of one card-matching unit of the distance positioning assembly is located in the gap of another card-matching unit, so that the two card-matching assemblies can be forked together. After the two card-matching assemblies are forked together, the four wire cores 1 are stretched apart, which is equivalent to the separation force applied to the two plug-ins 2 of the card-matching assembly, and can further enhance the clamping degree between the barbed teeth 2.4 of the two plug-ins 2 of the card-matching assembly.

[0028] As a preferred technical solution, the plug 2 is provided with an open cavity 2.5 located between the two arc-shaped portions 2.1 and a plurality of channels 2.6 distributed in parallel, each channel 2.6 connecting the open cavity 2.5 and the space between the four wire cores 1, and a portion of the channels 2.6 corresponding to the elastic plate 2.3 extends on the elastic plate 2.3 in the direction of the barbed teeth 2.4, and further, openings 2.7 connecting the open cavity 2.5 are provided at both ends of the plug 2 along the length direction of the wire core 1. In this way, at the plug 2, the oxygen-isolating material can be squeezed into and filled into the space in the middle of the spacing positioning assembly through the open cavity 2.5, the opening 2.7 and the channels 2.6.

[0029] During the production of the mineral insulated B1 flame retardant and fireproof cable, the steps for installing the spacing positioning assembly are as follows: align the two plug-ins 2 of one of the card-matching units in opposite directions and insert them into the two opposite gaps of the four cores 1 and further press them together so that the barbed teeth 2.4 are engaged; stagger the positions of the above-mentioned card-matching units in the length direction of the cores 1, align the two plug-ins 2 of the other card-matching unit in opposite directions and insert them into the other two opposite gaps of the four cores 1 and further press them together so that the barbed teeth 2.4 are engaged; block the position of the card-matching units in the length direction of the cores 1, The forward card assembly on the front side of the wire core 1 in the forward direction drives the forward card assembly on the rear side in the forward direction to move synchronously, so that the two card assemblies are forked together, and each spacing portion 2.2 spreads the four wire cores 1 in the same section two by two, so that each wire core 1 is kept in a stable state of being spread apart at a fixed distance, and at the same time, the barbed teeth 2.4 of the two plug-ins 2 of the card assembly can be kept in a clamped state; then the blocked card assembly is released, and the wire cores 1 forked together by the two card assemblies are installed to enter the oxygen barrier layer 3 extrusion process.

[0030] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A mineral insulated B1 flame retardant fireproof cable, characterized in that: The invention comprises four wire cores (1) distributed in a circumferential array, a plurality of spacing positioning components are arranged between the four wire cores (1) along the length direction, each of the spacing positioning components comprises two groups of card units distributed in a cross shape, each group of card units comprises two mutually engaging plug-ins (2); each of the plug-ins (2) comprises two arc-shaped portions (2.1) respectively adapted to two adjacent wire cores (1) and an elastic plate (2.3) inserted between the two adjacent wire cores (1); the connecting portion between the two arc-shaped portions (2.1) forms a spacing portion (2.2) spacing the two adjacent wire cores (1); the elastic plate (2.3) is fixedly connected to the spacing portion (2.2), both sides of the end of the elastic plate (2.3) are provided with barbed teeth (2.4), and the two plug-ins (2) of each card unit are engaged by the barbed teeth (2.4); an oxygen-isolating layer (3) is filled between each wire core (1) and the spacing positioning and on the surrounding side, and the surrounding side of the oxygen-isolating layer (3) is covered with an outer sheath (4).

2. A mineral insulated B1 flame retardant and fireproof cable according to claim 1, characterized in that: The cross-sectional curvature of each arc-shaped portion (2.1) is between 1 / 4π and 3 / 4π.

3. A mineral insulated B1 flame retardant and fireproof cable according to claim 1, characterized in that: In the length direction of the wire core (1), half of the spacing portion (2.2) is connected to the elastic plate (2.3), and the other half corresponds to the gap, and the elastic plate (2.3) of one card-matching unit of the spacing positioning assembly is located in the gap of another card-matching unit.

4. A mineral insulated B1 flame retardant and fireproof cable according to claim 3, characterized in that: The plug (2) is provided with an open cavity (2.5) located between the two arc-shaped portions (2.1) and a plurality of channels (2.6) distributed in parallel, each channel (2.6) communicating with the open cavity (2.5) and the space between the four wire cores (1), and a portion of the channel (2.6) corresponding to the elastic plate (2.3) extends on the elastic plate (2.3) in the direction of the barbed teeth (2.4).

5. A mineral insulated B1 flame retardant and fireproof cable according to claim 4, characterized in that: Along the length direction of the wire core (1), openings (2.7) communicating with the open cavity (2.5) are provided at both ends of the plug (2).

6. A mineral insulated B1 flame retardant and fireproof cable according to claim 1, characterized in that: The distance between two adjacent support positioning components is 200mm-400mm.

7. A mineral insulated B1 flame retardant and fireproof cable according to claim 1, characterized in that: Each of the wire cores (1) comprises, from the inside to the outside, a sheathed conductor (1.1), an insulating layer (1.2), an aluminum sheath (1.3) and an isolation sheath (1.4).

8. The mineral insulated B1 flame retardant and fireproof cable according to claim 1, characterized in that: The steps for installing the support spacing positioning assembly are as follows: Align the two plug-ins (2) of one of the card-matching units in opposite directions and insert them into two opposite gaps of the four wire cores (1) and further press them together so that the barbed teeth (2.4) are engaged; The positions of the above-mentioned card-matching units are staggered in the length direction of the wire core (1), and two plug-ins (2) of another card-matching unit are aligned in opposite directions and inserted into the other two opposite gaps of the four wire cores (1) and further pressed together so that the barbed teeth (2.4) are engaged; The card assembly located in front of the advancing direction of the wire core (1) is blocked, and the advancing wire core (1) drives the card assembly located in the rear of the advancing direction to move synchronously, so that the two card assemblies are forked together, and each spacing portion (2.2) spreads the distance between the same section of the four wire cores (1) in pairs, and then releases the blocked card assembly.

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