Fire protection sleeve for cables

Abstract

The utility model relates to the cable protection field especially relates to a cable fireproof protective sheath. The cable fireproof protective sheath includes the heat insulating layer and the protective outer layer from inside to outside, and the both are connected through the high temperature resistant suture and form the tubular protective cavity, the protective outer layer is the fiber cloth that surface coats elastic fireproof coating, the heat insulating layer is the fluffy inorganic fiber felt, the detachable buckle assembly is set to the protective outer layer along the length direction, and the whole is the sectional modularization structure. The cable fireproof protective sheath provided by the utility model sets up the protective outer layer and uses glass fiber base cloth to coat the silicone rubber fireproof coating, forms carbonization barrier layer under high temperature, and resists flame ablation, the heat insulating layer constructs three -dimensional heat insulation network through ceramic fiber blanket cross -laminated process, and double structure makes the protective sheath can bear the external high temperature, ensures the normal operation of internal cable.

Description

Technical Field

[0001] This utility model relates to the field of cable protection, and in particular to a fireproof protective sleeve for cables. Background Technology

[0002] In high-risk industries such as petrochemicals, the safety of the cables of emergency shut-off valve actuators is directly related to the overall safety of the tanks and the enterprise. Currently, although actuators are equipped with fire-resistant protective covers, the cables connecting to them only undergo simple fireproofing, resulting in insufficient fire resistance. Traditional cable protective layers cannot withstand the high-temperature impact of hydrocarbon fires at 1093℃, and are prone to melting and failure under high-temperature environments, leading to short circuits or insulation damage.

[0003] Therefore, it is necessary to provide a new fireproof cable protection sleeve to solve the above-mentioned technical problems. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, a fireproof cable protection sleeve is provided to solve the above-mentioned problems.

[0005] The fireproof cable protection sleeve provided by this utility model includes: an insulation layer and a protective outer layer from the inside out, which are connected by a high-temperature resistant stitching to form a tubular protective cavity; the protective outer layer is a fiber cloth with an elastic fireproof coating on the surface, and the insulation layer is a fluffy inorganic fiber felt; the protective outer layer is provided with a detachable fastening component along its length, and the whole is a segmented modular structure.

[0006] Preferably, the protective outer layer is made of glass fiber base cloth, and the surface is coated with a silicone rubber-like elastic fireproof coating to form a rigid fireproof layer with tensile strength.

[0007] Preferably, the heat insulation layer is a ceramic fiber blanket, which is filled into the inner side of the protective outer layer through a cross-lamination process to form a continuous three-dimensional heat insulation network structure.

[0008] Preferably, the fastening assembly includes a plurality of stainless steel buckle units spaced apart along the outer side of the protective outer layer. Each buckle unit consists of a steel buckle and a connecting strap, and the protective cavity can be quickly closed and opened by pulling the connecting strap.

[0009] Preferably, the inner edge of the protective outer layer is provided with an expansion sealing strip.

[0010] Preferably, the cross-section of the protective outer layer has a symmetrical arc-shaped structure, which adapts to the outer contour of the cable and reserves space for thermal expansion, so as to avoid the cable being squeezed at high temperature.

[0011] Preferably, the high-temperature resistant suture is made of fire-resistant steel wire, and the suture path is distributed in a grid pattern to enhance the structural integrity of the protective cavity.

[0012] Compared with related technologies, the fireproof cable protection sleeve provided by this utility model has the following beneficial effects:

[0013] This utility model features a protective outer layer made of glass fiber base cloth coated with a silicone rubber fireproof coating, which forms a carbonized barrier layer at high temperatures to resist flame erosion; the heat insulation layer is constructed through a cross-layering process of ceramic fiber blankets to create a three-dimensional heat insulation network. This dual structure allows the protective sleeve to withstand external high temperatures of ℃, ensuring the normal operation of the internal cables.

[0014] The fireproof steel wire mesh stitching process of this utility model enhances the overall structural integrity. Combined with the high-strength connection of the stainless steel buckle unit, it can withstand the instantaneous impact of short-circuit explosion and prevent the protective layer from deforming or cracking. The expansion sealing strip expands and fills the gaps at high temperature to form a seamless fireproof barrier and prevent flames from entering. Attached Figure Description

[0015] Figure 1 A schematic diagram of a preferred embodiment of the fireproof cable protection sleeve provided by this utility model;

[0016] Figure 2 for Figure 1 The diagram shows the structure of the steel buckle;

[0017] Figure 3 for Figure 1 The diagram shows the structure of the connecting strip.

[0018] The numbers in the diagram are: 1. Insulation layer; 2. Protective outer layer; 3. Steel buckle; 4. Connecting strip; 5. Expansion sealing strip. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0021] This utility model provides a cable fireproof protective sleeve, which includes: an insulation layer 1 and a protective outer layer 2 from the inside to the outside, which are connected by a high-temperature resistant stitching to form a tubular protective cavity; the protective outer layer 2 is a fiber cloth with an elastic fireproof coating on the surface, and the insulation layer 1 is a fluffy inorganic fiber felt; the protective outer layer 2 is provided with a detachable fastening component along its length, and the whole is a segmented modular structure.

[0022] It should be noted that: the heat insulation layer 1 is made of loose inorganic fiber felt, whose loose structure contains a large number of air cavities. Air, as a poor conductor of heat, can effectively block heat conduction and reduce the risk of cable damage due to external high temperatures; the protective outer layer 2 is a fiber cloth with an elastic fire-retardant coating on its surface. The fiber cloth provides basic physical protection against external scratches and impacts. When exposed to high temperatures, the elastic fire-retardant coating expands to form a dense heat insulation layer, delaying the spread of flames. At the same time, the elasticity of the coating makes it less prone to cracking and falling off during thermal expansion and contraction; the two are connected by high-temperature resistant stitching to form a tubular protective cavity, ensuring structural stability and preventing the heat insulation layer from separating from the protective outer layer and failing. The protective outer layer 2 has detachable fastening components along its length, which facilitates quick installation and disassembly, and is beneficial for cable inspection and maintenance; its segmented modular structure can be flexibly combined according to the actual cable laying length to adapt to different scenario requirements, improving installation convenience and practicality.

[0023] In the embodiments of this utility model, the protective outer layer 2 is made of glass fiber base cloth, and the surface is coated with a silicone rubber-like elastic fireproof coating to form a rigid fireproof layer with tensile strength.

[0024] It should be noted that the fiberglass base fabric, acting as the supporting skeleton, possesses high tensile strength, capable of withstanding external forces during cable installation and maintenance, preventing tearing and damage to the protective outer layer. Simultaneously, the high-temperature resistance of fiberglass ensures structural stability even at high temperatures. The silicone rubber-based elastic fire-retardant coating combines elasticity and fire resistance. It remains flexible at room temperature, adapting to dynamic scenarios such as cable bending and vibration, preventing protective failure due to the brittleness of rigid materials. At high temperatures, the coating rapidly expands to form a dense, intumescent fire-retardant layer, enhancing fire resistance by physically isolating flames and inhibiting heat conduction. Furthermore, the aging resistance of silicone rubber extends the service life of the protective outer layer.

[0025] In an embodiment of this utility model, the heat insulation layer 1 is a ceramic fiber blanket, which is filled inside the protective outer layer 2 through a cross-lamination process to form a continuous three-dimensional heat insulation network structure.

[0026] It should be noted that ceramic fiber blankets are made of high-temperature resistant ceramic fibers, possessing low thermal conductivity and high flexibility, allowing them to tightly adhere to the cable surface and reduce heat conduction paths. Their fiber structure itself exhibits excellent thermal stability, resisting shrinkage and embrittlement at high temperatures, thus maintaining their insulating properties. By stacking the ceramic fiber blankets at intersecting angles, a continuous three-dimensional insulating network structure is formed. This structure, with its crisscrossing fibers, not only enhances the overall strength of the insulation layer and prevents fiber displacement or breakage due to vibration or stretching, but also further blocks heat convection through the air cavities between the multiple fiber layers. These air cavities, acting as static air layers, have extremely low heat conduction efficiency, significantly improving insulation performance.

[0027] In an embodiment of this utility model, the fastening assembly includes a plurality of stainless steel buckle units spaced apart along the outer side of the protective outer layer 2. Each buckle unit consists of a steel buckle 3 and a connecting strap 4. The protective cavity can be quickly closed and separated by pulling the connecting strap 4.

[0028] It should be noted that the stainless steel clip unit consists of a steel clip 3 and a connecting strap 4. Utilizing the high strength and corrosion resistance of stainless steel, it ensures long-term stable operation in complex environments such as high temperature and humidity, preventing the loss of clipping function due to corrosion or high-temperature failure of ordinary metal parts. The steel clip 3 serves as a fixed anchor point, firmly connected to the outside of the protective outer layer 2, providing a stable clipping fulcrum. Its shape is designed to fit the clipping structure of the connecting strap 4, achieving mechanical locking through precise interlocking, ensuring the sealing and reliability of the protective cavity when closed. The connecting strap 4 is made of high-temperature resistant material, with one end hinged or fixedly connected to the steel clip 3, and the other end designed as a stretchable strap structure. Pulling or pulling the connecting strap 4 allows for quick tightening or loosening of the clip unit. When pulled, the connecting strap 4 drives the steel clip 3 to snap together, causing the two edges of the protective outer layer 2 to fit tightly together, forming a complete tubular protective cavity. When separated, the locking is released by reversing the operation, facilitating cable installation, inspection, or replacement, significantly improving installation and maintenance efficiency.

[0029] In the embodiments of this utility model, an expansion sealing strip 5 is provided on the inner edge of the protective outer layer 2. The cross-section of the protective outer layer 2 has a symmetrical arc structure, which adapts to the outer contour of the cable and reserves space for thermal expansion, so as to avoid the cable being squeezed at high temperature. The high temperature resistant stitching line is made of fireproof steel wire, and the stitching track is distributed in a grid pattern to enhance the structural integrity of the protective cavity.

[0030] It should be noted that: the expansion sealing strip 5 is made of a heat-expanding material, maintaining elasticity at room temperature and filling the gaps after the outer protective layer 2 is closed; in high-temperature environments, it rapidly expands to form a sealing and heat-insulating layer, blocking the leakage path of flames, smoke, and hot air, while simultaneously filling the gap between the cable and the protective sheath through flexible compression, improving fireproof sealing performance. The symmetrical arc-shaped cross-section structure precisely adapts to the outer contour curve of the cable, ensuring a tight fit between the protective sheath and the cable surface, reducing air layer heat convection; at the same time, it reserves space for thermal expansion, and the curvature design of the arc structure allows the outer protective layer 2 to expand slightly with the cable at high temperatures without generating rigid compression, avoiding damage to the cable insulation layer or cracking of the protective sheath due to thermal stress concentration, balancing protective performance and structural compatibility. The fireproof sheath steel wire stitching process uses a composite wire body with an internal steel core and an external fireproof coating. The steel core provides mechanical strength to prevent the stitching from breaking and causing the heat insulation layer 1 to separate from the outer protective layer 2; the external fireproof coating forms a carbonized layer at high temperatures, maintaining the integrity of the stitched structure. The grid-like stitching track firmly binds the two layers of material through a crisscrossing network of stitches, distributing localized stress and enhancing the tensile and tear resistance of the protective cavity. This prevents interlayer delamination caused by excessive stress at a single point, ensuring the stability of the overall structure under vibration, impact, and other scenarios.

[0031] The working principle of the cable fireproof protective sleeve provided by this utility model is as follows: When encountering a hydrocarbon fire, such as at a high temperature of 1093℃, the silicone rubber coating of the outer protective layer 2 rapidly expands and carbonizes, forming a dense heat insulation layer that prevents the flame from directly contacting the internal structure. At the same time, the ceramic fiber blanket of the heat insulation layer 1, through its cross-layered three-dimensional network structure, utilizes the air cavities in the fiber pores to slow down heat conduction, keeping the internal cable temperature within a safe threshold. The explosive pressure generated by the cable short circuit is dispersed by the fiberglass base cloth of the outer protective layer 2 and the fireproof steel wire mesh stitching structure, avoiding local stress concentration. The rigid connection of the stainless steel buckle units 3 and 4 and the flexible sealing of the expansion sealing strip 5 work together to ensure that the protective cavity does not crack or spread fire under impact. During installation, select the corresponding number of standard modules according to the cable length, wrap the single module around the outside of the cable with stainless steel clip units and tighten it. The expansion sealing strip 5 at the splice between modules leaves a gap at room temperature to accommodate the thermal expansion of the cable. At high temperature, it automatically expands and fills the gap. During maintenance, the damaged module can be disassembled and replaced individually, while the remaining modules remain in place and continue to work, minimizing downtime.

[0032] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fireproof protective sleeve for cables, characterized in that, include: It includes an inner and outer heat insulation layer (1) and a protective outer layer (2), which are connected by a high-temperature resistant stitch to form a tubular protective cavity; The protective outer layer (2) is a fiber cloth with an elastic fireproof coating on the surface, and the heat insulation layer (1) is a fluffy inorganic fiber felt; The protective outer layer (2) is provided with a detachable fastening component along its length and has a segmented modular structure.

2. The fireproof cable protection sleeve according to claim 1, characterized in that, The outer protective layer (2) is made of glass fiber base cloth and coated with a silicone rubber-like elastic fireproof coating to form a rigid fireproof layer with tensile strength.

3. The fireproof cable protection sleeve according to claim 2, characterized in that, The insulation layer (1) is a ceramic fiber blanket, which is filled inside the protective outer layer (2) through a cross-layering process to form a continuous three-dimensional insulation network structure.

4. The fireproof cable protection sleeve according to claim 3, characterized in that, The fastening assembly includes multiple stainless steel buckle units spaced apart along the outer side of the protective outer layer (2). Each buckle unit consists of a steel buckle (3) and a connecting strap (4). The protective cavity can be quickly closed and separated by pulling the connecting strap (4).

5. The fireproof cable protection sleeve according to claim 4, characterized in that, An expansion sealing strip (5) is provided on the inner edge of the protective outer layer (2).

6. The fireproof cable protection sleeve according to claim 5, characterized in that, The protective outer layer (2) has a symmetrical arc-shaped cross-section, which fits the outer contour of the cable and reserves space for thermal expansion, thus avoiding compression of the cable at high temperatures.

7. The fireproof cable protection sleeve according to claim 6, characterized in that, The high-temperature resistant suture is made of fireproof steel wire, and the suture path is distributed in a grid pattern to enhance the structural integrity of the protective cavity.

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