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Hitachi

Fans & Blowers

The following is an introduction to technology for converting from rotors to high-efficiency impellers and for modifying capacity control from suction valve to inlet vane, as a measure to support energy efficiency to prevent global warming.

Reduce axial power by using high-efficiency impellers

The efficiency of new impellers developed in 2001 has been further increased, so efficiency improvements of 5 to 10% have been achieved compared with blowers supplied prior to 1982.

(In-house comparison)

Image: Reduction of axial force using high-efficiency impeller

Optimal control using inlet vane

Capacity control over a wide range has been achieved by the combination of the optimal inlet vane design and high-efficiency impellers.
Good capacity control under partial load can be achieved using an inlet vane flow rate control device provided on the impeller inlet.

Image: comparison diagram of multi-stage turbo blower flow rate control characteristics.

( In case of discharge pressure control is invariable)

Photograph: optimal control using inlet vane

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Changing the control will result in the need for separate modification or changing of the electrical equipment.

Implementing energy efficiency proposals in accordance with customers' needs

  • Blower replacement
  • Proposal for modification to a high-efficiency rotor using the same blower casing, etc.