CDZ Series Marine Axial Flow Fans

1. Overview

The CDZ series marine low-noise axial flow fan (hereinafter referred to as the fan) is a new energy-saving, low-noise fan developed jointly by our factory and the Shanghai Ship Design and Research Institute. It combines high efficiency, low noise and smooth running, and meets the low-noise requirements of naval and merchant ships. It is suitable for ventilation and air renewal on all types of ships, and for other suitable applications.

2. Features

The CDZ fan is designed by the variable-circulation method. A reasonable variable-circulation coefficient is selected according to the fan parameters, so that the characteristic velocity and length are properly distributed over each blade section. Wide-profile blades make full use of the high peripheral velocity at the blade tips, giving the fan high efficiency, low noise, large flow and pressure coefficients, and light weight.

The design and manufacture of the CDZ fan take full account of the special conditions of shipboard use. The impeller undergoes strict dynamic balancing and overspeed testing, so the fan offers good corrosion resistance, resistance to rolling, shock and vibration, smooth running, and safe and reliable operation.

3. Structure

The impeller is made of press-formed aluminium sheet blades riveted to a galvanised hub; the casing and frame are made of ordinary steel plate with an anti-corrosion treatment.

The fan is built with the motor inside the casing, and the impeller rotates counter-clockwise. Because the blades are made of aluminium sheet, the fan is suitable for low-pressure, high-flow applications.

The fan is built with the motor inside the casing and the impeller mounted directly on the motor shaft. The fan is reversible; reverse-flow capacity is about 60% of forward flow. When changing from forward to reverse running, the motor must be restarted only after the impeller has come to a standstill.

The CDZ fan can be fitted with marine AC motors.