电缆桥架过热问题往往源于电缆密集敷设、环境通风不畅或材料导热效率不足。要解决这一难题，需从材料选型、结构设计、安装工艺三个维度综合考量。

　　The overheating problem of cable trays often stems from dense cable laying, poor environmental ventilation, or insufficient thermal conductivity of materials. To solve this problem, it is necessary to comprehensively consider three dimensions: material selection, structural design, and installation process.

　　材料导热性是基础保障

　　The thermal conductivity of materials is the fundamental guarantee

　　铝合金桥架因其优异的导热性能成为散热，其热传导系数是普通镀锌钢的3倍以上，能快速将电缆产生的热量传导桥架表面，通过空气对流实现降温。对于腐蚀性环境，可采用阳极氧化处理的铝合金，在保持导热性的同时增强耐候性。若必须使用钢制桥架，建议选择表面镀锌加喷塑的复合工艺，既提升防腐性能，又避免因金属裸露导致的局部过热。

　　Aluminum alloy cable trays have become the preferred choice for heat dissipation due to their excellent thermal conductivity, with a thermal conductivity coefficient more than three times that of ordinary galvanized steel. They can quickly transfer the heat generated by cables to the surface of the cable tray and achieve cooling through air convection. For corrosive environments, aluminum alloys treated with anodizing can be used to enhance weather resistance while maintaining thermal conductivity. If steel cable trays must be used, it is recommended to choose a composite process of surface galvanizing and spray coating, which not only improves anti-corrosion performance but also avoids local overheating caused by metal exposure.

　　结构设计决定通风效率

　　Structural design determines ventilation efficiency

　　梯级式桥架相比槽式桥架具有天然散热优势，其开放式结构可使空气流通面积提升60%以上，配合每层50-80mm的间距设计，能有效形成垂直通风通道。对于必须使用槽式桥架的场景，应优先选择带散热孔的型号，孔径建议控制在10-15mm，间距不大于50mm，确保散热与防护的平衡。此外，桥架高度每增加50mm，内部空气可提升20%，为散热预留更多空间。

　　Compared to trough type cable trays, cascade type cable trays have natural heat dissipation advantages. Their open structure can increase the air circulation area by more than 60%, and with a spacing design of 50-80mm per layer, they can effectively form vertical ventilation channels. For scenarios that require the use of trough type cable trays, priority should be given to models with heat dissipation holes. It is recommended to control the hole diameter within 10-15mm and the spacing should not exceed 50mm to ensure a balance between heat dissipation and protection. In addition, for every 50mm increase in the height of the bridge, the internal air volume ratio can be increased by 20%, leaving more space for heat dissipation.

　　安装工艺影响散热效果

　　The installation process affects the heat dissipation effect

　　桥架敷设时需保持与建筑结构的合理间距，顶部距楼板应留有200mm以上空隙，侧面距墙面不小于100mm，避免形成热空气滞留区。在电缆填充率控制上，应遵循“下层密上层疏”原则，底层填充率不超过30%，上层可放宽45%，利用热空气上升特性形成自然对流。对于大电流电缆，建议采用“品”字形排列替代传统平铺方式，增大电缆间散热间隙。

　　When laying cable trays, it is necessary to maintain a reasonable distance from the building structure. The top should have a gap of at least 200mm from the floor slab, and the side should be no less than 100mm from the wall to avoid the formation of a hot air retention zone. In the control of cable filling rate, the principle of "dense lower layer and sparse upper layer" should be followed. The filling rate of the lower layer should not exceed 30%, and the filling rate of the upper layer can be relaxed to 45%, utilizing the rising characteristics of hot air to form natural convection. For high current cables, it is recommended to use a "cross" shaped arrangement instead of the traditional flat layout method to increase the heat dissipation gap between cables.

　　特殊场景强化散热方案

　　Special scenario enhanced heat dissipation solution

　　在高温机房或室外暴晒环境，可在桥架表面涂覆红外辐射散热涂料，通过增强热辐射能力提升散热效率。对于密集型数据中心，可考虑在桥架底部加装U型导热铝板，将热量直接传导机房冷通道。若环境温度持续超过40℃，建议配置桥架专用散热风机，采用温感控制实现按需通风，避免持续运行带来的能耗问题。

　　In high-temperature computer rooms or outdoor exposure environments, infrared radiation heat dissipation coatings can be applied to the surface of bridge frames to enhance heat radiation capabilities and improve heat dissipation efficiency. For dense data centers, it may be considered to install U-shaped heat-conducting aluminum plates at the bottom of the cable tray to directly conduct heat to the cold aisle of the computer room. If the ambient temperature continues to exceed 40 ℃, it is recommended to install a dedicated cooling fan for the bridge frame and use temperature sensing control to achieve on-demand ventilation, avoiding energy consumption problems caused by continuous operation.

　　通过科学选材、结构优化和规范安装，可显著提升电缆桥架的散热性能。实际操作中需结合负载电流、环境温度等参数进行综合计算，必要时可借助热成像仪进行现场测试，确保桥架系统始终处于温升范围内。

　　Through scientific material selection, structural optimization, and standardized installation, the heat dissipation performance of cable trays can be significantly improved. In practical operation, comprehensive calculations should be made based on parameters such as load current and ambient temperature. If necessary, thermal imaging instruments can be used for on-site testing to ensure that the bridge system is always within the safe temperature rise range.

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