Novel B1-level fire-resistant high-temperature-resistant flexible cable and production method thereof

Abstract

The invention provides a novel B1-level fire-resistant and high-temperature-resistant flexible cable and a production method thereof, the novel B1-level fire-resistant and high-temperature-resistant flexible cable comprises a flexible conductor, the appearance of the flexible conductor is a surrounding type fixed wire diameter of which the cross section is provided with two straight edges and an arc-shaped edge, the flexible conductor is externally coated with ceramic silicone rubber, the ceramic silicone rubber is externally coated with a silicone rubber insulating tape in an attached manner, and the silicone rubber insulating tape is provided with a sheath. A glass fiber tape is arranged outside the silicone rubber insulating tape, and a B1-level protective sleeve is fixedly arranged outside the glass fiber tape in a wrapping manner; the flexible conductors are made of one of class 5 copper, tinned copper or aluminum alloy conductor materials, the flexible conductors with the sector-like external sections are arranged, B1-level optimization requirements of fire resistance and flexibility of a single-phase filling cable and a four-phase filling cable are met, and the cable can be applied to use scenes with high-level fireproof safety.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature resistant cable processing, and in particular to a novel B1-grade fire-resistant and high-temperature resistant flexible cable and a production method thereof. Background Art

[0002] At present, the power transmission industry has increasingly higher requirements for cables with fire resistance and long-term temperature resistance. In particular, in some places with relatively large inlet flow, the Housing and Urban-Rural Development Bureau explicitly requires the use of B1-level cables with long-term operating temperatures above 105°C (normally 70°C and 90°C). Therefore, a new type of B1-level fire-resistant and high-temperature resistant soft cable was invented and designed. In addition to meeting the fire resistance requirements, it also meets the B1-level flame retardant characteristics in GB31247. Even in the event of a fire, it can well ensure the normal power supply of the power system and maintain the operation of elevators or other power escape equipment. It also has excellent heat release, smoke density, toxicity, etc. There is minimal release in all aspects, buying people enough time to escape. Traditional cables mostly use polyvinyl chloride (PVC) or cross-linked polyethylene (XLPE) insulation, whose long-term operating temperatures are 70°C and 90°C, respectively, far below normal standard operating requirements. As a result, their flame retardancy and high-temperature resistance fail to meet Class B1 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 multiple internal conductors, have excessive internal filling and poor flexibility, failing to meet the high-temperature power transmission requirements of soft conductors.

[0003] To achieve the above objectives, the present invention provides a novel B1-class fire-resistant and high-temperature-resistant flexible cable and a production method thereof, which can solve the problems raised in the above background technology. Summary of the Invention

[0004] The present invention adopts the following technical solutions to achieve:

[0005] A novel B1-class fire-resistant and high-temperature-resistant flexible cable and its production method, comprising a flexible conductor having an enclosed fixed-diameter cross-section with two straight sides and one curved side. The flexible conductor is externally coated with ceramic silicone rubber, which is externally wrapped with a silicone rubber insulating tape, which is externally coated with a glass fiber tape, which is externally fixedly coated with a B1-class protective sheath.

[0006] The soft conductor is made of one of the 5 types of copper, tinned copper or aluminum alloy conductor materials.

[0007] Preferably, a coated mica tape is provided on the outside of the soft conductor to fix the shape of the soft conductor and provide a fire-resistant effect. 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-extruded sheet at the extrusion end during extrusion, and the ejection port of the elliptical co-extruded sheet is provided with two straight sides and one arcuate side having the same cross-section as the soft conductor, and the connecting portions between the two straight sides and the arcuate side are both chamfered and elliptical;

[0009] An extrusion groove is provided at the extruded inner end of the elliptical co-extruded sheet, and the extrusion groove is arranged on the inner wall close to the two straight edges.

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

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

[0012] Preferably, when the soft conductors are distributed in a single bundle, the four soft conductors are externally coated with different rubber insulating tapes, and the silicone rubber insulating tapes are filled and extruded;

[0013] An overheating channel is provided between the fitting gaps of the ceramic silicone rubber in the fourth item, and the interior of the overheating channel is filled with a phase change material.

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

[0015] Preferably, the glass fiber tape is wrapped in a coiled manner.

[0016] A novel B1-grade fire-resistant and high-temperature-resistant flexible cable production method comprises the following steps: S1, preparing a soft conductor material: electrolyzing raw copper to form a copper rod, and then drawing the copper rod, wherein the diameter of the formed single wire is 0.1-0.2 mm;

[0017] S2, twisting: twisting the bundled monofilaments;

[0018] S3. Fix the insulation: Keep the conductor in a twisted state and attach mica tape to the outer wrapping. Use a pressing roller to press the mica tape onto the twisted soft conductor.

[0019] S4, silicone internal filling: the insulated soft conductor is loosely fed into the wire tube and filled with ceramic silicone rubber. After the soft conductor is attached and formed, the ceramic silicone rubber is coated on the outside for the second time. The ceramic silicone rubber is heated and shrunk at a temperature of 150 degrees, and a random inspection link is set;

[0020] S5. Laying the outer soft layer: Wrap the silicone rubber insulating tape around the outside of the ceramic silicone rubber by filling the inner diameter of the pipeline or wrapping it on the outside, and heat shrink it twice at a temperature of 200 degrees, and set up a random inspection link; Steps S4 and S5 can be completed simultaneously through a double-layer co-extrusion device, and the trial heating temperature is 200 degrees;

[0021] S6. Overall fixation: Set glass fiber tape on the outside of the silicone rubber insulation tape and fill it with B1 grade low smoke zero halogen outer sheath (meeting GB31247) to fix the end of the wired cable;

[0022] S7. Inspection: Check its on-off stability. When the minimum heat resistance temperature is higher than 200 degrees, it is qualified and can be put into storage.

[0023] Preferably, in step S2, for the cable layout with multiple soft conductors, the deflection positions of different soft conductors are adjusted to make the ceramic silicone rubber formed between them fit together, and an overheating channel is set in the middle of the four items and filled with phase change material. Then, the silicone rubber insulating tape is squeezed in for the second time, and a random inspection link is set, and the test temperature is 200 degrees.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention meets the optimization requirements of single-item filling cables and four-item filling cables by providing a soft conductor with a fan-shaped external cross-section. The specific improvement effects include: 1. By wrapping the single-item soft conductor with ceramic silicone rubber and silicone rubber insulating tape, the external part of the single-item soft conductor can obtain a more complete fixation and heat insulation effect, and the side effect of its bending property only comes from the influence of the soft conductor material and the external rubber material itself, and the structure can be softer and have a smaller bending angle;

[0026] 2. When multiple soft conductors are parallel in the same cable, the fitting design of the straight edges on both sides can better combine the inner core soft conductors and gather the bundle area of ​​the inner core soft conductors, so that the soft conductors have more wire items and smaller wire cross-section radius during wrapping and molding, thus having better bending properties;

[0027] 3. When twisting a unidirectional soft conductor, the gaps between the copper wires on its surface do not form a complete and slender integrated external gap. Instead, the gaps formed are coiled irregular gaps. This can create more short contact surfaces when the coated mica tape is arranged, thereby increasing the strength of the reverse external solution. As a result, the coated mica tape of the twisted soft conductor has better performance and is less likely to crack during processing.

[0028] In addition, by implementing an ovalization process on the outside of the soft conductor and the inner diameter of the elliptical co-extruded sheet, this device can naturally form a channel for uniform contact between the four soft conductors. The reasonable arrangement of the phase change material can greatly improve the fire resistance and high temperature resistance of the cable, while reducing the penetration contact effect between the phase change material and the external coating mica tape.

[0029] The insulation adopts a double-layer co-extrusion process: the inner layer is extruded with ceramic 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 has high temperature resistance of at least 200℃ and is softer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the cross-sectional structure of four flexible conductors twisted in parallel according to the present invention;

[0031] Figure 2 Schematic diagram of the cross-sectional structure of a single flexible conductor of the present invention;

[0032] Figure 3 This is a schematic diagram of the cross-sectional structure of the unidirectional soft conductor array of the present invention after four items are arranged and twisted;

[0033] Figure 4 It is a schematic structural plan view of the elliptical co-extruded sheet of the present invention.

[0034] In the figure: 1. Soft conductor; 2. Coated mica tape; 3. Ceramic silicone rubber; 4. Silicone rubber insulating tape; 5. Fiberglass tape; 6. B1 grade protective cover; 7. Oval co-extruded sheet; 8. Overheating channel; 9. Extrusion groove. DETAILED DESCRIPTION

[0035] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention 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 content disclosed in the present invention more thorough and comprehensive.

[0036] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly used by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] The present invention will be further described in detail below with reference to the accompanying drawings.

[0039] Please refer to the attached Figure 1-3 , comprising a soft conductor 1, the cross-section of which is an enclosed fixed-wire diameter with two straight sides and one curved side. The outside of the soft conductor 1 is coated with a ceramic silicone rubber 3, the outside of the ceramic silicone rubber 3 is attached with a silicone rubber insulating tape 4, the outside of the silicone rubber insulating tape 4 is provided with a glass fiber tape 5, and the outside of the glass fiber tape 5 is fixedly coated with a B1-level protective sleeve;

[0040] The soft conductor 1 is made of one of the five types of copper, tinned copper or aluminum alloy conductor materials;

[0041] The outside of the soft conductor 1 is provided with a coated mica tape 2, which is used to fix the shape of the soft conductor 1 and provide a fire-resistant effect. The insulation thickness of the coated mica tape 2 is 0.3-0.5 mm. When the thickness of the mica tape is 0 mm, the high temperature resistance peak of the detection cable is ≥200 degrees. When the thickness of the mica tape is 0.5 mm, the high temperature resistance peak of the detection cable is ≥300 degrees. After fixing the mica layer, the outside can be sintered.

[0042] Please pay attention to Figure 2-Figure 4 The soft conductor 1 is provided with an elliptical co-extruded sheet 7 at the extrusion end during extrusion. The ejection port of the elliptical co-extruded sheet 7 is provided with two straight sides and one arcuate side having the same cross-section as the soft conductor 1. The two straight sides and the arcuate side are connected by chamfered elliptical treatment.

[0043] The extruded inner end of the elliptical co-extruded sheet 7 is provided with an extrusion groove 9, and the extrusion groove 9 is provided on the surface of the inner wall soft conductor 1 close to the two straight edges. Figure 1 In the state shown, the surfaces of the extruded gullies 9 are close to each other, which can make the fit more compact and provide a certain bending performance;

[0044] This device implements ovalization of the corners of the outside of the soft conductor 1 and the inner diameter of the elliptical co-extruded sheet 7, so that channels that are uniformly in contact with the four soft conductors 1 are naturally formed. Reasonable arrangement of the phase change material can greatly enhance the fire resistance and high temperature resistance of the cable, while reducing the penetration contact effect between the phase change material and the external coating mica tape 2.

[0045] Please pay attention to Figure 1 、 Figure 3 , the fire-resistant soft conductor 1 inside the same flexible cable can be a single-item multi-bundle distribution or a four-item distribution;

[0046] When the soft conductors 1 are distributed in four pieces, the four soft conductors 1 are covered with the same silicone rubber insulating tape 4, the ceramic silicone rubber 3 is wrapped, and the adjacent straight edges of the two soft conductors 1 are in contact with each other; Figure 1 The mica surfaces of the soft conductor 1 inside it fit together. When the unidirectional soft conductor 1 is twisted, the copper wire gaps on its surface will not form an integrated, complete and slender integrated external gap. The gap formed is a coiled irregular gap. When the coated mica tape 2 is arranged, more short contact surfaces can be generated, which can improve the strength of the inverse external solution. The coated mica tape 2 of the twisted soft conductor 1 has better performance and is less likely to crack during processing.

[0047] The flexible conductor 1 of the fourth item is externally coated with a non-identical rubber insulating tape, and the silicone rubber insulating tape 4 is filled and extruded;

[0048] An overheating channel 8 is provided between the bonding gaps of the ceramic silicone rubber 3 in the fourth item, and the interior of the overheating channel 8 is filled with a phase change material;

[0049] The phase change material may be one of glycerol, paraffin, and water (ice);

[0050] The glass fiber tape 5 is wrapped in a coiled manner.

[0051] Please pay attention to Figure 1 A novel B1-grade fire-resistant and high-temperature-resistant flexible cable production method comprises the following steps: S1, preparation of soft conductor 1 material: electrolyzing raw copper into copper rods and then drawing the resulting single wire into a diameter of 0.1-0.2 mm, which affects the bending flexibility of the cable;

[0052] S2, twisting: twisting the bundled monofilaments;

[0053] S3. Fix the insulation: Keep the conductor in a twisted state and attach mica tape to the outer wrapping. Use a pressing roller to press the mica tape onto the twisted soft conductor 1.

[0054] S4, silicone internal filling: the insulated soft conductor 1 is loosely fed into the wire tube and filled with ceramic silicone rubber 3. After the soft conductor 1 is attached and formed, the ceramic silicone rubber 3 is coated on the outside for a second time. The outside of the ceramic silicone rubber 3 is heated and shrunk at a heating temperature of 150 degrees, and a random inspection link is set;

[0055] S5, outer soft layer laying: Wrap the silicone rubber insulating tape 4 on the outside of the ceramic silicone rubber 3 by filling the inner diameter of the pipeline or wrapping it on the outside, and heat and shrink it twice at a temperature of 200 degrees, and set a random inspection link; steps S4 and S5 can be completed simultaneously through a double-layer co-extrusion device, and the trial heating temperature is 200 degrees;

[0056] S6. Overall fixation: A glass fiber tape 5 is arranged on the outside of the silicone rubber insulating tape 4 and filled with a B1-level low-smoke zero-halogen outer sheath (meeting GB31247) to fix the ends of the wired cables;

[0057] S7. Inspection: Check its on-off stability. When the minimum heat resistance temperature is higher than 200 degrees, it is qualified and can be put into storage.

[0058] In step S2, for the cable layout with multiple soft conductors 1, the deflection positions of different soft conductors 1 are adjusted to make the ceramic silicone rubber 3 formed between them fit together, and an overheating channel 8 is set in the middle of the four items and filled with phase change material. Then, the silicone rubber insulating tape 4 is squeezed in for the second time, and a random inspection link is set, and the test temperature is ≥200 degrees.

[0059] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0060] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A new type of B1 grade fire-resistant and high-temperature resistant flexible cable, characterized by: The invention comprises a soft conductor (1), wherein the cross section of the soft conductor (1) is an enclosed fixed wire diameter with two straight sides and one arc-shaped side, the outside of the soft conductor (1) is covered with a ceramic silicone rubber (3), the outside of the ceramic silicone rubber (3) is attached with a silicone rubber insulating tape (4), the outside of the silicone rubber insulating tape (4) is provided with a glass fiber tape (5), and the outside of the glass fiber tape (5) is fixedly covered with a B1-level protective sleeve; The soft conductor (1) is made of one of five types of copper, tinned copper or aluminum alloy conductor materials.

2. A new type of B1 fire-resistant and high-temperature resistant flexible cable according to claim 1, characterized in that: A coated mica tape (2) is provided on the outside of the soft conductor (1) for fixing the shape of the soft conductor (1) and providing a fire-resistant effect. The insulating thickness of the coated mica tape (2) is 0.3 to 0.5 mm.

3. A new type of B1 class fire-resistant and high-temperature resistant flexible cable according to claim 1, characterized in that: The soft conductor (1) is provided with an elliptical co-extruded sheet (7) at the extrusion end during extrusion, and the ejection port of the elliptical co-extruded sheet (7) is provided with two straight edges and one arc-shaped edge having the same cross-section as the soft conductor (1), and the two straight edges and the arc-shaped edge are connected to each other with chamfered elliptical edges; The extruded inner end of the elliptical co-extruded sheet (7) is provided with an extrusion groove (9), and the extrusion groove (9) is arranged on the inner wall close to the two straight edges.

4. A new type of B1 fire-resistant and high-temperature resistant flexible cable according to claim 1, characterized in that: The fire-resistant soft conductor (1) inside the same soft cable can be distributed in a single-phase multi-bundle manner or in a four-phase distribution manner.

5. A new type of B1 fire-resistant and high-temperature resistant flexible cable according to claim 4, characterized in that: When the soft conductors (1) are distributed in four pieces, the four soft conductors (1) are externally covered with the same silicone rubber insulating tape (4), the ceramic silicone rubber (3) is wrapped, and the adjacent straight edges of the two soft conductors (1) are in contact with each other.

6. A new type of B1 fire-resistant and high-temperature resistant flexible cable according to claim 4, characterized in that: When the soft conductors (1) are distributed in a single multi-bundle manner, the four soft conductors (1) are externally coated with different rubber insulating tapes, and the silicone rubber insulating tapes (4) are filled and extruded; An overheating channel (8) is provided between the fitting gaps of the four ceramic silicone rubbers (3), and the interior of the overheating channel (8) is filled with a phase change material.

7. A new type of B1 fire-resistant and high-temperature resistant flexible cable according to claim 6, characterized in that: The phase change material can be one of glycerin, paraffin, and water (ice).

8. The novel B1-class fire-resistant and high-temperature-resistant flexible cable according to claim 4, characterized in that: The glass fiber tape (5) is wrapped in a coiled manner.

9. A novel method for producing a Class B1 fire-resistant and high-temperature resistant flexible cable, according to the non-disassembly self-insulating truss floor deck according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Soft conductor (1) Material preparation: The raw copper is electrolyzed to form a copper rod and then drawn into a single wire with a diameter of 0.1-0.2 mm; S2, twisting: twisting the bundled monofilaments; S3. Fixing the insulation: Maintaining the twisted state and attaching mica tape to the outer wrapping, using a pressing roller to press and attach the mica tape to the twisted soft conductor (1); S4, filling with silicone inside: loosely feed the insulated soft conductor (1) into the wire tube and fill it with ceramic silicone rubber (3), attach the formed soft conductor (1) line and then coat the ceramic silicone rubber (3) on the outside for a second time, heat the outside of the ceramic silicone rubber (3) to shrink the tube, the heating temperature is 150 degrees, and set a random inspection link; S5, laying of outer soft layer: wrap the silicone rubber insulating tape (4) on the outside of the ceramic silicone rubber (3) by filling the inner diameter of the pipeline or wrapping it on the outside, and heat shrink it twice, the heating temperature is 200 degrees, and a random inspection link is set; steps S4 and S5 can be completed simultaneously through a double-layer co-extrusion device, and the trial heating temperature is 200 degrees; S6. Overall fixation: a glass fiber tape (5) is arranged on the outside of the silicone rubber insulation tape (4), and filled with a B1-level low-smoke zero-halogen outer sheath (meeting GB31247) to fix the end of the wired cable; S7. Inspection: Check its on-off stability. When the minimum heat resistance temperature is higher than 200 degrees, it is qualified and can be put into storage.

10. The method for producing a novel B1-class fire-resistant and high-temperature-resistant flexible cable according to claim 4, characterized in that: In step S2, for the cable arrangement with multiple soft conductors (1), the deflection positions of different soft conductors (1) are adjusted so that the ceramic silicone rubber (3) formed between the two are fitted together, and an overheating channel (8) is set in the middle of the four items and filled with phase change material, and then the silicone rubber insulating tape (4) is squeezed in for the second time, and a random inspection link is set, and the test temperature is ≥200 degrees.

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