A graphite flame barrier

Abstract

This utility model discloses a graphite fire-resistant ring, comprising a metal shell, graphene expanded material fixed inside the shell, and anchors for connecting to a wall. Composite fibers are added to the graphene expanded material, and these fibers are pre-designed in a curved shape within the graphene expanded material. When heated, the graphene expanded material expands, causing the pre-designed curved composite fibers to straighten and acquire tensile strength under the influence of this expansion. The composite fibers and expanded graphite form a "reinforced concrete" composite barrier, resisting airflow shear forces.

Description

Technical Field

[0001] This utility model relates to the field of composite fire arrestors, and in particular to a graphite fire arrestor. Background Technology

[0002] Fire collars (also called fireproof collars) are made of metal with a flame-retardant expanding core material inside. They are fitted onto the outer wall of rigid polyvinyl chloride (PVC) pipes and fixed to the floor or wall. When a fire occurs, the core material expands rapidly due to heat, squeezing the UPVC pipe and sealing the pipe opening in a short time, preventing the fire from spreading along the opening. This product has the advantages of compact structure, beautiful appearance, organic combination of leak prevention and fire protection, and convenient construction and installation.

[0003] In a fire, fire arrestors, as a critical fire barrier at pipe penetration points, not only need to withstand the direct erosion of high-temperature flames but also the impact of the intense airflow generated by the high temperature. The core expansion material of traditional fire arrestors (such as graphene-like substances) can rapidly expand to form a dense carbon layer after being heated, playing a role in physically isolating oxygen and blocking heat conduction.

[0004] However, when the expandable body lacks effective internal structural support, its mechanical properties suffer from significant shortcomings: graphene expandable materials form porous carbon layers through layer stacking at high temperatures, and their flame-retardant mechanism relies on the dense physical barrier formed by the stacking of two-dimensional layers. However, these expandable bodies are mostly loose honeycomb or sponge-like structures with high internal porosity and a slender skeleton. Under the impact of high-speed airflow, the weak connection points of the expandable body are prone to breakage, leading to the collapse of the overall structure and loss of sealing. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a graphite fire arrestor ring.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] This utility model discloses a graphite fire arrestor ring, comprising a metal shell, a graphene expanded material fixed inside the shell, and an anchor for connecting to a wall. Composite fibers are added to the graphene expanded material, and the composite fibers are pre-set in a curved shape within the graphene expanded material. When the graphene expanded material is heated, it expands, and the pre-set curved composite fibers inside straighten under the influence of its expansion, thus exhibiting tensile strength.

[0008] As a preferred technical solution of this utility model, the composite fibers are distributed in a grid structure or a two-way cross grid structure.

[0009] As a preferred technical solution of this utility model, the composite fiber is composed of nickel-titanium shape memory alloy fiber and alumina fiber mixed together.

[0010] As a preferred embodiment of this invention, the composite fiber is bent in an Ω-shape or a spiral shape.

[0011] As a preferred technical solution of this utility model, in the grid structure, ceramic microsphere anchoring nodes are provided at the grid intersections.

[0012] As a preferred embodiment of this invention, the composite fiber accounts for 5-15% of the volume of the graphene expanded material.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. Composite fibers and expanded graphite form "steel bars" A "concrete" composite barrier that resists airflow shear forces. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a first partial structural composite fiber first state diagram of this utility model;

[0018] Figure 3 This is a second state diagram of the first partial structure of the composite fiber of this utility model;

[0019] Figure 4 This is a first state diagram of the second partial structure of the composite fiber of this utility model;

[0020] Figure 5 This is a second partial structural composite fiber second state diagram of this utility model;

[0021] In the figure: 1. Metal shell; 2. Graphene expanded material; 3. Anchor; 4. Composite fiber; 5. Ceramic microsphere anchoring node. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] In the attached diagram, all identical reference numerals refer to the same components.

[0024] like Figure 1-5As shown, this utility model provides a graphite fire arrestor ring, including a metal shell 1, a graphene expanded material 2 fixed inside the shell, and an anchor 3 for connecting to a wall. Composite fibers 4 are added to the graphene expanded material 2. The composite fibers 4 are pre-set in a curved shape in the graphene expanded material 2. When the graphene expanded material 2 is heated, it expands, and the pre-set curved composite fibers 4 inside straighten under the influence of its expansion and have tensile strength.

[0025] In this invention, the composite fiber 4 is straightened and triggered at high temperature to enhance tensile strength.

[0026] In an optional embodiment, the composite fibers 4 are distributed in a grid structure or a bidirectional cross-grid structure.

[0027] It should be noted that the length of one side of the mesh is 1 / 4 of the thickness of the expanding material. 1 / 2, and the angle between adjacent grid layers is 30°. 90°

[0028] In an optional embodiment, the composite fiber 4 is composed of a blend of nickel-titanium shape memory alloy fibers and alumina fibers.

[0029] It should be noted that the nickel-titanium fiber straightening is triggered at 300℃, with a tensile strength reaching 1950 MPa. Simultaneously, graphite expansion within the microspheres fills the gaps, with the nickel-titanium shape memory alloy fiber accounting for 50% of the fiber composition. 70%, single filament diameter 0.03 0.08mm, bending radius R=0.5 1.2mm; the surface of the alumina fiber is coated with a nano-silica layer.

[0030] In an optional embodiment, the composite fiber 4 is bent in an Ω-shape or a spiral shape.

[0031] It should be noted that the preset deformation recovery temperature is 300℃±10℃, and the tensile strength after straightening is ≥1800MPa.

[0032] In an optional embodiment, ceramic microsphere anchoring nodes 5 are provided at the intersections of the grid structure.

[0033] It should be noted that the microspheres have a diameter of 100 mm. 300μm, containing expanded graphite cores (particle size 20 μm) 50μm).

[0034] In an optional embodiment, the composite fiber 4 accounts for 5-15% of the volume of the graphene expanded material 2.

[0035] It should be noted that the direction of the curved fiber axis forms an angle of 20°-70° with the axial direction of the flame arrestor pipe.

[0036] The working principle of this utility model is as follows:

[0037] Stage 1: In the room temperature standby state (<200℃), bent fibers (Ω-shaped / spiral) are pre-embedded in the graphite matrix in a compressed state, with a radius of curvature R=0.5. 1.2mm; Function: The fiber bending shape avoids obstructing the graphite sheet stacking path, ensuring the expansion ratio remains at 200. 300 times (same as the unenhanced version).

[0038] Stage 2: Phase Transformation Triggered State (300℃±10℃) The fiber-intelligent nickel-titanium shape memory alloy reaches the austenitic phase transformation point, molecular lattice reconstruction releases stored elastic potential energy, and the fiber is forcibly straightened from a bent state; the straightening process generates axial tensile stress (σ≥1800MPa) and radial expansion force (expansion tension coefficient K=1.8). 2.3). Graphite co-deformation fibers radial tension compresses graphite microsheets into the fiber gaps for migration (migration distance d=10). (50μm); at the grid nodes, the outer shell of the ceramic microspheres cracks, and the internal expanded graphite cores are ejected by heat, filling the micro-gaps between the fiber layers.

[0039] Stage 3: High-temperature barrier state (≥500℃) reinforcement layer formation: Straightened fibers and expanded graphite form "steel bars" "Concrete" type composite barrier: Fiber mesh: continuous grid pattern (interlayer angle 30°) (90°) Resisting airflow shear force.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A graphite fire arrestor ring, comprising a metal shell (1), a graphene expanded material (2) fixed inside the shell, and an anchor (3) for connecting to a wall, characterized in that, Composite fibers (4) are added to the graphene expanded material (2). The composite fibers (4) are pre-curved in the graphene expanded material (2). The graphene expanded material (2) expands when heated, and the pre-curved composite fibers (4) inside straighten under the influence of its expansion and have tensile properties.

2. The graphite fire-retardant ring according to claim 1, characterized in that, The composite fibers (4) are distributed in a grid structure or a bidirectional cross grid structure.

3. The graphite fire-retardant ring according to claim 1, characterized in that, The composite fiber (4) is bent in an Ω-shape or a spiral shape.

4. A graphite fire-retardant ring according to claim 2, characterized in that, The grid structure has ceramic microsphere anchoring nodes (5) at the grid intersections.

5. A graphite fire-retardant ring according to claim 1, characterized in that, The composite fiber (4) accounts for 5-15% of the volume of the graphene expanded material (2).

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