Forward Curved Central Fan (SWSI) is a centrifugal fan used for handling high flow, low and medium pressure air.
Marine fans are mainly used on ships for:
- Ventilation and exchange of various compartments;
- Various marine air conditioners;
- Boiler drum and induced draft;
- Cushioning and propulsion of hovercraft;
- Submarine ascent;
- Ventilation of various pressurized compartments;
- Inert gas, incineration, regeneration, air purification and other systems.
The use of marine fans is quite extensive and will continue to increase in power with the development of ships and marine equipment.
In terms of basic principles, there is no significant difference between marine fans and land fans. However, due to its use on ships, it has its own characteristics in terms of performance parameters, design, structure, materials, etc. For example, to reduce size, centrifugal fans often use forward facing blade impellers; To prevent corrosion, explosion, and reduce weight, aluminum impellers are often used; For the convenience of disassembly and assembly on board, the axial fan is made into an openable casing structure that can shake the motor and impeller out of the casing, and the centrifugal fan is made into a structure that can remove the impeller from both sides of the casing, etc. Other special fans, such as those used in hovercraft, are different from land-based products and require specialized design.
Generally, marine fans are mainly considered to meet the requirements of marine use, which limits their adoption of more efficiency improvement measures. In addition, the power of general marine fans is not large (several kilowatts), so the structure is relatively simple and the efficiency is not high.
The marine wind turbines in our country are mainly developed by the 704th Research Institute of the Sixth Machinery Department. Before the 1960s, the main products were imported or imitated from the Soviet Union, and after the 1960s, they began to design and manufacture their own products. We have developed nearly a hundred models of various marine wind turbines, which basically meet the needs of Chinese ships.
Standard series products
Marine fans are widely used, with a wide variety and complex models. Standardization and serialization of products are crucial. After investigating the usage of more than ten ship fans and some foreign standards, the first batch of standard parameters for ship fans in China was compiled in 1960, namely the basic parameters of centrifugal fans (CBl04-60); Basic parameters of boiler blower (CBl05-60): Basic parameters of axial flow fan (CB213–60). But these standards have not been implemented and a series of products have not been produced. In 1963, the 704th Research Institute of the Sixth Machinery Department and the General Machinery Research Institute of the First Machinery Department jointly led the formulation of new standards. Two standard parameters and two draft standard technical conditions have been formulated under the principles of military civilian universality, ship land integration, and distance and proximity integration, namely: the type and basic parameters of centrifugal ventilation models for ships (B641-64); The types and basic parameters of vertical axial flow ventilation models for ships (JB644-64), namely CQ and CJ marine centrifugal fans and CLZ marine vertical axial flow fans.
These three standard series products have been successfully developed and used for ships, with the CJ model mainly used for submarines. The vast majority of fans used on Chinese ships are these products. It is used well, but there are also some issues that cannot be fully applied on export ships and urgently need improvement.
Non standard products
There are many non-standard products in our country, mainly including centrifugal and axial flow ventilators for military ships, blowers for submarine buoyancy, high-pressure ventilators for harmful gases and air purification, high-temperature induced draft fans (350-400 ℃) for incinerators, ventilation fans for pressurized cabins, air conditioning fans, and large specific speed centrifugal lift fans for hovercraft.
