A high roundness cable uniformly coated with refractory mortar

Abstract

A kind of high roundness cable coated with refractory mortar evenly, comprising a plurality of round cores, filled with framework at the gap of adjacent cores, the straight line where the outer edge of framework is located is tangent to the two adjacent round cores, and refractory mortar layer is extruded outside the overall structure formed by round core and framework.The utility model provides a kind of high roundness cable coated with refractory mortar evenly, can reduce the use amount of refractory mortar under the premise of meeting the filling thickness requirement of refractory mortar filling layer, avoid the situation that traditional multicore cable causes excessive raw material consumption and cost increase due to the uneven thickness of refractory mortar, simultaneously prevent the deformation of cable after extrusion caused by the uneven thickness of refractory mortar layer, ensure the roundness of cable, also solve the problem that the radius of refractory mortar layer increases and the use amount of refractory mortar increases due to the previous setting of round framework.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a high roundness cable uniformly coated with refractory mud. Background Technology

[0002] The structure of traditional multi-core cables coated with refractory mortar, such as Figure 1 As shown, when the refractory mortar at point a, where the thickness is narrowest, meets the minimum thickness standard, the refractory mortar thickness at point b far exceeds the required standard value. This results in excessive and unnecessary consumption of refractory mortar raw materials, increasing costs. Furthermore, the uneven thickness of the refractory mortar layer may lead to deformation of the cable after compression, affecting its roundness. Therefore, our company has proposed a three-core fire-resistant medium-voltage cable as disclosed in authorization announcement number CN214588118U. This cable has a skeleton outside the core, with a circular outer contour. Refractory mortar is then extruded onto the outside of this circular skeleton, forming a uniformly thick refractory mortar layer. However, the circular skeleton increases the radius of the refractory mortar layer, resulting in increased refractory mortar consumption. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a high roundness cable with uniform refractory mortar coating, which reduces the amount of refractory mortar used and ensures the roundness of the cable while meeting the filling thickness of the refractory mortar filling layer.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a high roundness cable uniformly coated with refractory mud, comprising multiple circular cores, with a skeleton filling the gap between adjacent cores, the straight line of the outer edge of the skeleton being tangent to two adjacent circular cores, and a refractory mud layer being extruded on the outside of the overall structure formed by the circular cores and the skeleton.

[0005] Preferably, the skeleton is made of a low-smoke, halogen-free polyolefin material.

[0006] Preferably, the outer side of the integral structure formed by the circular wire core and the skeleton is provided with a polyethylene layer for covering it, and a refractory mud layer is extruded on the outside of the polyethylene layer.

[0007] Preferably, the refractory mortar layer is provided with a wrapping layer on the outside.

[0008] Preferably, an outer protective layer is provided on the outside of the wrapping layer.

[0009] Preferably, there are three circular wire cores arranged in an equilateral triangle.

[0010] Preferably, the wrapping layer is made of ceramicized fireproof tape.

[0011] This invention provides a high roundness cable uniformly coated with refractory mortar, which can reduce the amount of refractory mortar used while meeting the filling thickness requirements of the refractory mortar filling layer. It avoids the excessive consumption of raw materials and increased costs caused by uneven refractory mortar thickness in traditional multi-core cables. At the same time, it prevents the cable from deforming under pressure due to uneven refractory mortar layer thickness, ensuring the roundness of the cable. It also solves the problem that setting a circular skeleton increases the radius of the refractory mortar layer and the amount of refractory mortar used. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the existing technology; Figure 2 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0013] like Figure 2 As shown, a high-roundness cable uniformly coated with refractory mortar includes multiple circular cores 1. A skeleton 2 fills the gaps between adjacent cores 1. The straight line containing the outer edge of the skeleton 2 is tangent to two adjacent circular cores 1. A refractory mortar layer 3 is extruded onto the outer side of the overall structure formed by the circular cores 1 and the skeleton 2. This design solves the problems of material waste and increased costs caused by uneven refractory mortar thickness in traditional multi-core cables. It also avoids cable deformation under pressure, ensuring cable roundness. Furthermore, it overcomes the previous drawback of increased refractory mortar usage due to the circular skeleton, reducing the amount of refractory mortar used while meeting the refractory mortar filling thickness requirements.

[0014] Preferably, the skeleton 2 is made of low-smoke halogen-free polyolefin material. This reduces the generation of toxic and harmful gases and smoke during cable combustion, improving the environmental friendliness and safety of the cable during use. Preferably, the outer side of the integral structure formed by the circular wire core 1 and the skeleton 2 is provided with a polyethylene layer 4 for covering it, and a refractory mortar layer is extruded on the outside of the polyethylene layer 4. The polyethylene layer can provide a stable covering for the internal wire core and skeleton, making the internal structure more regular, while isolating the refractory mortar from the internal structure, avoiding adverse effects of the refractory mortar on the internal components, and further ensuring the uniformity of the refractory mortar coating.

[0015] Preferably, the refractory mortar layer 3 is provided with an outer wrapping layer 5. This enhances the structural stability of the refractory mortar layer and ensures the continued effectiveness of the cable's fire resistance.

[0016] Preferably, an outer protective layer 6 is provided on the outside of the wrapping layer 5.

[0017] Preferably, there are three circular wire cores 1 arranged in an equilateral triangle.

[0018] Preferably, the wrapping layer 5 is made of ceramicized fireproof tape. Ceramicized fireproof tape can quickly solidify into a hard ceramic body under high temperature environment, which can significantly improve the high temperature resistance and fire resistance of the cable. In extreme situations such as fire, it can effectively block the spread of flames, ensure that the critical functions of the cable are not damaged temporarily, and improve the safety protection level of the cable.

[0019] This invention addresses the problems of uneven thickness leading to raw material waste and easy deformation of cables under pressure when coating multi-core cables with refractory mortar, as well as the increased amount of refractory mortar required by the previous circular skeleton design. By filling the gaps between adjacent circular cores with a skeleton whose outer edge is tangent to the adjacent core, a refractory mortar layer is extruded on the outside of the overall structure formed by the circular cores and the skeleton. At the same time, a polyethylene layer covering the overall structure, a ceramicized fireproof tape wrapping layer outside the refractory mortar layer, and an outer protective layer outside the tape layer can be added. This achieves a reduction in the amount of refractory mortar used while meeting the refractory mortar filling thickness requirements, ensuring the roundness of the cable, and improving the cable's environmental friendliness, fire resistance, and structural stability.

[0020] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A high-roundness cable uniformly coated with refractory mortar, comprising multiple circular cores (1), characterized in that: A skeleton (2) is filled in the gap between adjacent wire cores (1). The straight line where the outer edge of the skeleton (2) is located is tangent to the two adjacent circular wire cores (1). A refractory mud layer (3) is extruded on the outside of the overall structure formed by the circular wire cores (1) and the skeleton (2).

2. The high roundness cable uniformly coated with refractory mud according to claim 1, characterized in that: The skeleton (2) is made of low-smoke halogen-free polyolefin material.

3. The high roundness cable uniformly coated with refractory mud according to claim 1, characterized in that: The outer side of the integral structure formed by the circular core (1) and the skeleton (2) is provided with a polyethylene layer (4) for covering it, and a refractory mud layer is extruded on the outside of the polyethylene layer (4).

4. The high roundness cable uniformly coated with refractory mud according to claim 1, characterized in that: The refractory mud layer (3) is provided with a wrapping layer (5) on the outside.

5. The high roundness cable uniformly coated with refractory mud according to claim 4, characterized in that: An outer protective layer (6) is provided on the outside of the wrapping layer (5).

6. The high roundness cable uniformly coated with refractory mud according to claim 1, characterized in that: The circular wire core (1) has three parts, arranged in an equilateral triangle.

7. The high roundness cable uniformly coated with refractory mud according to claim 4, characterized in that: The wrapping layer (5) is made of ceramic fireproof tape.

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