What are the Structure Characteristics and Working Theory of Tunnel Axial Flow Main Ventilator Fan Blower?

Tunnel axial flow main ventilator fan blowers are essential components in ventilation systems designed for tunneling and other industrial applications. They exhibit unique structural features and operational principles that optimize airflow and minimize noise. Here’s an overview of their key characteristics:

Comprehensive Structure:

The tunnel fan comprises axial flow ventilation components and anechoic devices. Typical components include a collector, front and back mufflers, the main unit group, impeller group, motor, and structural elements.

Optimized Blade Design:

To mitigate inter-stage gas pulsations in contra-rotating fans, the design ensures that only one pair of blades overlaps between front and back stages during rotation. This configuration uses coprime number inter-stage blades to optimize aerodynamic performance. It effectively meets the quantitative ventilation requirements for tunnel faces, even over long distances, and operates efficiently at low flow rates with minimal noise.

Sound Absorption Design:

The barrel and structural parts are constructed from welded steel plates. The inner barrel features perforated plates filled with anechoic materials that absorb and reduce airflow noise, enhancing operational quietness.

Motor Assembly and Electrical Configuration:

The motor assembly type includes a motor footing piece and mounting plate connected with bolts. The fan utilizes a Y series three-phase asynchronous motor, with rated voltage options customizable to client requirements (e.g., 380/660V or 660/1140V). The electrical connection method (△ or Y) is chosen based on the power supply voltage to optimize performance.

Robust Construction and Easy Maintenance:

Each air duct connection employs flange bolts, ensuring a tightly structured and durable linkage between the impeller and motor. This design not only enhances stability but also facilitates straightforward operation and maintenance procedures.

Contrarotating Design for Efficiency:

The fan adopts a contrarotating structure, which reduces internal resistance and increases overall efficiency, contributing to energy savings and improved performance.

Versatility and Multi-stage Capability:

This series of fans can be configured for multi-stage operation to accommodate varying ventilation requirements. It can also operate effectively at a single stage, although efficiency may be slightly reduced in this mode.

Safety Features:

Equipped with a grounding device, the fan ensures reliable grounding to prevent electrical leakage and ensure safe operation in industrial environments.

Ease of Installation and Connection:

The diffuser anechoic barrel outlet includes a flange for easy connection with the air duct, simplifying installation and ensuring secure connections.

In conclusion, tunnel axial flow main ventilator fan blowers are engineered with a focus on efficiency, noise reduction, and operational reliability. Their advanced design features and structural integrity make them indispensable for effective tunnel ventilation and other demanding industrial applications.