A new type of B1 grade fire and high temperature resistant flexible cable

Abstract

The utility model provides a novel B1 grade fire -resistant high temperature -resistant flexible cable, including soft conductor, the appearance of soft conductor is surrounded type fixed wire diameter with two straight edges and an arc edge in cross section, the outside of soft conductor is equipped with the ceramic silicon rubber, the outside of ceramic silicon rubber is wrapped and is pasted and is equipped with the silicon rubber insulating tape, the outside of silicon rubber insulating tape is equipped with glass fiber tape, the outside fixed covering of glass fiber tape is equipped with B1 grade protective sheath, the soft conductor is one of 5 kinds of copper, tinned copper or aluminium alloy conductor material quality, the utility model discloses an outside cross section type fan -shaped soft conductor is set up, satisfies the fire resistance and the flexibility of single filling cable and four filling cable B1 level optimization demand, can be applied to the use scene of high -level fire -safety.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature resistant cable processing technology, specifically a new type of B1-grade fire-resistant and high-temperature resistant flexible cable. Background Technology

[0002] Currently, the power transmission industry is demanding increasingly stringent requirements for cables, including fire resistance and long-term temperature resistance. This is particularly true in applications with high inflow rates, where the Ministry of Housing and Urban-Rural Development has explicitly mandated the use of B1-grade cables with a long-term operating temperature exceeding 105℃ (normally 70℃ and 90℃ are acceptable). Therefore, this utility model design presents a new type of B1-grade fire-resistant and high-temperature resistant flexible cable. In addition to meeting fire resistance requirements, it also meets the B1-grade flame-retardant characteristics specified in GB31247. Even in the event of a fire, it can reliably ensure the normal power supply to the system and maintain the operation of elevators or other electrical escape equipment. Furthermore, it exhibits low overall heat release, smoke density, and toxicity. In terms of various aspects, there is very little release, buying people enough time to escape; traditional cables mostly use PVC or cross-linked polyethylene insulation, with long-term operating temperatures of 70℃ and 90℃ respectively, far below normal standard usage requirements. This results in their flame-retardant and high-temperature resistance properties failing to meet B1 level requirements. Furthermore, the smoke, heat, and chemical fumes released by these cables during a fire are harmful to the human body, hindering bodily functions and preventing escape; some high-temperature resistant cables, due to the excessive internal filling of multiple inner conductors and poor flexibility, cannot meet the high-temperature power transmission requirements of soft conductors.

[0003] To achieve the above objectives, this utility model provides a novel B1-grade fire-resistant and high-temperature resistant flexible cable, which can solve the problems mentioned in the background art. Utility Model Content

[0004] This utility model adopts the following technical solution:

[0005] A novel B1-grade fire-resistant and high-temperature resistant flexible cable includes a flexible conductor. The flexible conductor has a fixed wire diameter with two straight sides and one arc-shaped side in its cross-section. The flexible conductor is covered with ceramicized silicone rubber. A silicone rubber insulation tape is attached to the outside of the ceramicized silicone rubber. A glass fiber tape is attached to the outside of the silicone rubber insulation tape. A B1-grade protective sleeve is fixedly wrapped around the outside of the glass fiber tape.

[0006] The soft conductor is one of five types of conductor materials: copper, tin-plated copper, or aluminum alloy.

[0007] Preferably, the soft conductor is provided with a coated mica tape on the outside to fix the shape of the soft conductor and provide fire resistance, and the insulation thickness of the coated mica tape is 0.3 to 0.5 mm.

[0008] Preferably, the soft conductor is provided with an elliptical co-extrusion sheet at the extrusion end during extrusion. The outlet of the elliptical co-extrusion sheet is provided with two straight sides and one arc-shaped side that are the same as the cross-section of the soft conductor. The connection points between the two straight sides and the arc-shaped side are all chamfered elliptical.

[0009] The inner end of the elliptical co-extruded sheet is provided with extrusion grooves, which are located on the inner wall near the two straight edges.

[0010] Preferably, the fire-resistant soft conductors inside the same flexible cable can be distributed in a single-phase multi-bundle or four-phase configuration.

[0011] Preferably, when the soft conductors are distributed in four phases, the four soft conductors are covered with the same silicone rubber insulating tape, the ceramicized silicone rubber is encapsulated, and the adjacent straight edges of the two soft conductors are in contact with each other.

[0012] Preferably, when the soft conductor is distributed in a single-phase multi-bundle configuration, the four soft conductors are covered with different rubber insulating tapes, and the silicone rubber insulating tapes are filled by extrusion.

[0013] The four ceramicized silicone rubbers described herein have an overheating channel between their bonding gaps, and the interior of the overheating channel is filled with a phase change material.

[0014] Preferably, the phase change material can be one or more of glycerol, paraffin, and water (ice).

[0015] Preferably, the fiberglass tape is coiled and wrapped.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model meets the optimization requirements of single-phase and four-phase filled cables by setting an external cross-section fan-shaped soft conductor. The specific improvement effects include: 1. The single-phase soft conductor can obtain a more complete fixation and heat insulation effect by wrapping it with ceramicized silicone rubber and silicone rubber insulation tape. Moreover, the side effect of its bending is only from the influence of the soft conductor material and the external rubber material itself. Structurally, it can achieve a softer and smaller bending angle.

[0018] 2. When multiple soft conductors run parallel between the same cable, the straight edge design on both sides can better combine the inner soft conductor, increase the bundle area of ​​the inner soft conductor, and make the soft conductor have more wires and a smaller cross-sectional radius when wrapped, thus having better bending properties.

[0019] 3. When a unidirectional soft conductor is twisted, the gaps between the copper wires on its surface do not form a complete and elongated integral external gap. Instead, the gaps formed are irregular, coiled gaps. When the coated mica tape is arranged, more short contact surfaces can be generated, which can improve the strength of the reverse external break. As a result, the coated mica tape of the twisted soft conductor has better performance and is less prone to cracking during processing.

[0020] In addition, by performing corner elliptic treatment on the outer surface of the soft conductor and the inner diameter of the elliptical co-extruded sheet, this device can naturally form a uniform channel between the four soft conductors and make uniform contact with the four soft conductors. The reasonable setting of phase change material can further improve the fire resistance and high temperature resistance of the cable, while reducing the penetration contact effect between the phase change material and the outer coating mica tape.

[0021] The insulation is produced using a double-layer co-extrusion process: the inner layer is extruded with ceramicized silicone rubber, which has excellent fire resistance and low heat release; the outer layer is extruded with a layer of silicone rubber insulation, which not only has high insulation performance but also high temperature resistance of at least 200℃, and is more flexible. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the parallel stranded cross-sectional structure of the four soft conductors of this utility model;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the unidirectional soft conductor of this utility model;

[0024] Figure 3 A schematic diagram of the cross-sectional structure of the unidirectional soft conductor array of this utility model after four-phase setting and twisting;

[0025] Figure 4 This is a schematic diagram of the elliptical co-extruded sheet of this utility model.

[0026] In the diagram: 1. Soft conductor; 2. Coated mica tape; 3. Ceramicized silicone rubber; 4. Silicone rubber insulating tape; 5. Fiberglass tape; 6. Class B1 protective sleeve; 7. Elliptical co-extruded sheet; 8. Overheating channel; 9. Extrusion groove. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] Please refer to the attached document carefully. Figure 1-3 The system includes a flexible conductor 1, which has a fixed wire diameter with two straight sides and one arc-shaped side in cross-section. The flexible conductor 1 is covered with ceramicized silicone rubber 3. The ceramicized silicone rubber 3 is wrapped with silicone rubber insulating tape 4. The silicone rubber insulating tape 4 is covered with glass fiber tape 5. The glass fiber tape 5 is fixedly covered with a B1-grade protective sleeve.

[0032] The soft conductor 1 is one or more of the following materials: copper of type 5, tin-plated copper, or aluminum alloy conductor. When multiple materials are twisted together, type 5 copper is used as the main material and tin-plated copper is used as an additional material. The ratio of type 5 copper to tin-plated copper should be greater than 1. When multiple materials are arranged, tin-plated copper is evenly distributed among the four materials. When aluminum alloy is used as an additional material, the ratio of type 5 copper to tin-plated copper should be greater than 3.

[0033] The soft conductor 1 is provided with a coated mica tape 2 on the outside, which is used to fix the shape of the soft conductor 1 and provide fire resistance. The insulation thickness of the coated mica tape 2 is 0.3-0.5mm. When the mica tape thickness is 1.5mm, the high temperature resistance peak of the test cable is ≥200 degrees. When the mica tape thickness is 2mm, the high temperature resistance peak of the test cable is ≥300 degrees. After fixing the mica layer, the outside can be sintered.

[0034] Please refer to this carefully. Figures 2-4 The soft conductor 1 is provided with an elliptical co-extruded sheet 7 at the extrusion end during extrusion. The outlet of the elliptical co-extruded sheet 7 is provided with two straight sides and one arc side with the same cross-section as the soft conductor 1. The connection points between the two straight sides and the arc side are all chamfered elliptical.

[0035] The elliptical co-extruded sheet 7 has extrusion grooves 9 at its inner extrusion end. These grooves 9 are located on the surface of the inner wall soft conductor 1 near the two straight edges, as shown in the figure. Figure 1 As shown, the surfaces of the extrusion grooves 9 are close to each other, which allows for a tighter fit and provides some bending performance.

[0036] This device ellipticalizes the corners of the soft conductor 1 and the inner diameter of the elliptical co-extruded sheet 7 by performing corner elliptical treatment on the outside of the soft conductor 1. This allows the four soft conductors 1 to naturally form a uniform channel that is in uniform contact with the four soft conductors 1. The reasonable setting of the phase change material can further improve the fire resistance and high temperature resistance of the cable, while reducing the penetration contact effect between the phase change material and the outer coating mica tape 2.

[0037] Please refer to this carefully. Figure 1 , Figure 3 The fire-resistant soft conductor 1 inside the same soft cable can be a single-phase multi-bundle distribution or a four-phase distribution;

[0038] When the soft conductor 1 is distributed in four phases, the four soft conductors 1 are externally covered by the same silicone rubber insulating tape 4, and the ceramicized silicone rubber 3 is a wrapping type, with adjacent straight edges of each pair of soft conductors 1 adhering to each other; see reference as follows Figure 1 The soft conductor 1 inside is attached to each other. When the unidirectional soft conductor 1 is twisted, the gap between the copper wires on its surface will not form a complete and long integrated external gap. Instead, the gap formed is an irregular coiled gap. When the coated mica tape 2 is arranged, more short contact surfaces can be generated, which can improve the strength of the reverse external decomposition. As a result, the coated mica tape 2 of the twisted soft conductor 1 has better performance and is less prone to cracking during processing.

[0039] The soft conductor 1 described in the four items is externally covered with a different rubber insulating tape, and the silicone rubber insulating tape 4 is filled by extrusion.

[0040] A heat exchange channel 8 is provided between the bonding gaps of the ceramicized silicone rubber 3 described in the four items, and the interior of the heat exchange channel 8 is filled with a phase change material.

[0041] The phase change material can be one of glycerol, paraffin, or water (ice);

[0042] The fiberglass tape 5 is coiled and wrapped.

[0043] Please refer to this carefully. Figure 1 A new type of B1 grade fire-resistant and high-temperature resistant flexible cable production method includes the following steps: S1, soft conductor 1 material preparation: after electrolysis of raw material copper to make copper rods, the rods are drawn into wires with a single wire diameter of 0.1-0.2mm. The single wire diameter affects the bending flexibility of the cable.

[0044] S2, Twisting: Twisting together bundled monofilaments;

[0045] S3. Fixed insulation: Maintain the stranded state and attach mica tape to the outside of the wrapping, and use a pressing roller to press and attach the mica tape to the stranded soft conductor 1.

[0046] S4. Silicone internal filling: The insulated soft conductor 1 is loosely fed into the tube and filled with ceramicized silicone rubber 3. After the soft conductor 1 is attached and formed, ceramicized silicone rubber 3 is wrapped on the outside a second time. The outside of the ceramicized silicone rubber 3 is heated and shrunken. The heating temperature is 150 degrees and a sampling inspection is set up.

[0047] S5. Laying the outer soft layer: The silicone rubber insulating tape 4 is wrapped around the ceramicized silicone rubber 3 by filling the inner diameter of the pipeline or by external coiling, and then subjected to secondary heating and shrinking at a temperature of 200 degrees Celsius, with a sampling inspection step set up; Steps S4 and S5 can be completed simultaneously by a double-layer co-extrusion device, with a test heating temperature of 200 degrees Celsius.

[0048] S6. Overall fixing: A glass fiber tape 5 is set on the outside of the silicone rubber insulation tape 4 and filled with a B1 grade low smoke halogen-free outer sheath (meeting GB31247) to fix the end of the cable.

[0049] S7. Inspection: Inspect its switching stability. It is considered qualified if the minimum heat resistance temperature is higher than 200 degrees and it is then put into storage.

[0050] In step S2, for the cable laying with multiple soft conductors 1, the deflection positions of different soft conductors 1 are adjusted so that the ceramicized silicone rubber 3 formed between each pair is bonded together. A heat-excessive channel 8 is set in the middle of the four sections and filled with phase change material. Then, silicone rubber insulation tape 4 is extruded for the second time, and a sampling inspection is set. The test temperature is ≥200 degrees.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A novel B1 class fire and heat resistant flexible cable, characterized in that: Includes a soft conductor (1), the soft conductor (1) has a fixed wire diameter with two straight sides and one arc side in the cross section, the soft conductor (1) is covered with ceramicized silicone rubber (3), the ceramicized silicone rubber (3) is wrapped with silicone rubber insulating tape (4), the silicone rubber insulating tape (4) is covered with glass fiber tape (5), and the glass fiber tape (5) is fixedly covered with a B1 grade protective sleeve. The soft conductor (1) is one or more of the following five types of conductor materials: copper, tin-plated copper, or aluminum alloy.

2. A novel B1 class fire and heat resistant flexible cable as claimed in claim 1, wherein: The soft conductor (1) is provided with a coated mica tape (2) on the outside to fix the shape of the soft conductor (1) and provide fire resistance. The insulation thickness of the coated mica tape (2) is 0.3~0.5mm.

3. A novel B1 class fire and heat resistant flexible cable as claimed in claim 1, wherein: The soft conductor (1) is provided with an elliptical co-extruded sheet (7) at the extrusion end during extrusion. The outlet of the elliptical co-extruded sheet (7) is provided with two straight sides and one arc side with the same cross section as the soft conductor (1). The connection points between the two straight sides and the arc side are all chamfered elliptical. The extrusion inner end of the elliptical co-extruded sheet (7) is provided with extrusion grooves (9), which are located on the inner wall near the two straight edges.

4. A novel B1 class fire and heat resistant flexible cable as claimed in claim 1, wherein: The fire-resistant soft conductor (1) inside the same soft cable is either a single-phase multi-bundle distribution or a four-phase distribution.

5. A novel B1 class fire and heat resistant flexible cable as claimed in claim 4, wherein: When the soft conductor (1) is distributed in four phases, the four soft conductors (1) are covered with the same silicone rubber insulating tape (4), the ceramicized silicone rubber (3) is wrapped, and the adjacent straight edges of the soft conductors (1) are attached to each other.

6. A novel B1 class fire and heat resistant flexible cable as claimed in claim 4, wherein: When the soft conductor (1) is distributed in a single-phase multi-bundle pattern, the four soft conductors (1) are covered with different rubber insulating tapes, and the silicone rubber insulating tape (4) is filled and extruded. A heat exchange channel (8) is provided between the bonding gaps of the four ceramicized silicone rubbers (3), and the interior of the heat exchange channel (8) is filled with a phase change material.

7. A novel B1 class fire and heat resistant flexible cable as claimed in claim 6, wherein: The phase change material is one of glycerol, paraffin, or water.

8. A novel B1 class fire and heat resistant flexible cable as claimed in claim 4, wherein: The fiberglass tape (5) is coiled and wrapped.

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