Precautions

Structural Features of High-Temperature Tube Furnaces

I. Appearance 1.1. Materials: The chamber is fabricated from cold-rolled steel sheet through precision machining on CNC equipment, with the exterior surface subjected to high-temperature oxidation treatment, resulting in an aesthetically pleasing, elegant appearance and harmonious color scheme. 1.2. Door Opening Method: Top-opening design, suitable for a wide range of experiments, such as calcination. 1.3. Structure: Features a double-walled furnace shell with a fan installed between the two layers, enabling rapid heating and cooling while maintaining a low outer-shell temperature. II. Electrical Components 2.1. Thermocouples: Utilize nationally standardized precious-metal thermocouple wires as raw materials, ensuring accurate and stable temperature measurement. Thermocouples are matched to the selected furnace temperature: Type K (0–1200°C), Type S (0–1600°C), and Type B (0–1820°C). 2.2. Temperature Controller: Employs a fully intelligent, Taiwan-made PID controller with either 16 or 32 control segments. The controller features a dual-line LED display and is primarily used for precise temperature control, offering rapid response and programmable automatic heating, holding, and cooling profiles across 16 or 32 segments. It supports unattended operation, incorporates PID control, includes deviation monitoring, and provides over-temperature power-off alarms, thereby ensuring consistency and reproducibility in any experiment. The unit also boasts automatic constant-temperature and time-control functions, along with a secondary over-temperature automatic protection feature, guaranteeing reliable control and safe operation. 2.3. Electrical Components: Adopts nationally standardized electrical components, including phase-shift triggering and thyristor control, assembled into an intelligent electrical system specifically matched to the furnace. This configuration offers long service life, excellent shock resistance, safety, and quiet operation, effectively replacing outdated relay-based circuits. 2.4. Transformer: Equipped with a fully isolated, silent copper-wire transformer that generates minimal noise, produces little heat, and features a high safety factor (provided for silicon-molybdenum rod furnaces and molybdenum wire furnaces). III. Furnace Chamber 3.1. Inner Wall: Constructed from high-temperature fiberboard or high-temperature refractory bricks, carefully assembled in multiple layers. The inner wall exhibits exceptional resistance to high temperatures, acids, alkalis, and oxidation, is highly crack-resistant, has a long service life, low thermal conductivity, and energy-saving performance. Its unique design ensures durability, prevents collapse, and allows selection of appropriate refractory materials based on furnace temperature. 3.2. Intermediate Insulation Layer: Uses ceramic fiber insulation materials such as ordinary alumina, high-alumina, and zirconia-containing high-alumina, which offer excellent high-temperature resistance, low thermal conductivity, and zero pollution (insulation material selected according to operating temperature). 3.3. Outer Insulation Layer: Composed of high-temperature felt or nano-fiber board (insulation material chosen based on operating temperature).

2019-08-05

2019

08-05

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