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Hitachi

Fans & Blowers

The following is an introduction to ventilation fans that contribute to preserving the environment in tunnels.

Jet fans & Booster fans

Photograph: Jet fan & Booster fan

These fans remove soot and carbon monoxide emitted from vehicles to maintain safe and comfortable driving.
Ventilation is carried out in the direction the vehicles travel, which contributes to reducing the construction cost.

Features

Axial-flow fans have a simple structure with impellers fitted to a motor contained in a casing to which noise-absorbing material has been applied, and are suspended from tunnel ceilings for use.

Jet fan: Can blow in both directions
Booster fan: Blows in only one direction

Standard specifications

The following shows the model number used based on the ventilation rate. (JF: Jet fan, BF: Booster fan)

Standard specifications
Type JF600 JF1000 JF1250 JF1500 BF1250 BF1500
Discharge velocity 30 m/s or higher 30 m/s or higher 30 m/s or higher 30 m/s or higher 30 m/s or higher 30 m/s or higher
Capacity 8 m³/s or higher 25 m³/s or higher 37 m³/s or higher 55 m³/s or higher 37 m³/s or higher 55 m³/s or higher
Efficiency 60% or higher 65% or higher 75% or higher 70% or higher 75% or higher 70% or higher
Noise level 90 dB(A) or less 95 dB(A) or less 95 dB(A) or less 95 dB(A) or less 95 dB(A) or less 95 dB(A) or less
Impeller diameter 630 mm 1,030 mm 1,250 mm 1,530 mm 1,250 mm 1,530 mm
External diameter 800 mm 1,200 mm 1,450 mm 1,750 mm 1,450 mm 1,750 mm
Overall length 3,000 mm 4,250 mm 4,250 mm 4,250 mm 4,250 mm 4,250 mm
Motor output 11 kW or less 25 kW or less 30 kW or less 50 kW or less 30 kW or less 50 kW or less
Approximate weight 600 kg or less 1,300 kg or less 1,800 kg or less 2.500 kg or less 1,700 kg or less 2.300 kg or less
  • * The weight of the mounting ceiling attachment , etc.
  • * The (A) applied to the noise units indicates A-scale corrected values.

High blow velocity specification

The following shows the model number used based on the ventilation rate. (JF: Jet fan, BF: Booster fan)

Type JF600H JF1000H JF1250H
Discharge velocity 35 m/s or higher 35 m/s or higher 35 m/s or higher
Capacity 10 m³/s or higher 29 m³/s or higher 43 m³/s or higher
Efficiency 70% or higher 75% or higher 75% or higher
Noise level 90 dB(A) or less 95 dB(A) or less 95 dB(A) or less
Impeller diameter 630 mm 1,030 mm 1,250 mm
External diameter 800 mm 1,200 mm 1,450 mm
Overall length 3,000 mm 4,250 mm 4,250 mm
Motor output 15 kW or less 33 kW or less 50 kW or less
Approximate weight 600 kg or less 1,300 kg or less 1,800 kg or less
  • * The weight of the mounting ceiling attachment , etc.
  • * The (A) applied to the noise units indicates A-scale corrected values.

Option specifications

  • Low-noise jet fan to reduce the noise at tunnel openings
  • All-stainless-steel jet fan for high corrosion resistance

Fields of application

Road tunnel ventilation

Ventilators & exhaust fans

Large axial-flow fans with diameters ranging from 2,000-4,000 mm are installed in long tunnels to draw in fresh air and expel polluted air. Also, many axial-flow fans are installed in thermal power stations.

Photograph: Large capacity fan for tunnel ventilation
Large capacity fan for
tunnel ventilation

Photograph: Large capacity fan for thermal power station
Large capacity fan for
thermal power station

Photograph: Large capacity fan for thermal power station (varlable pitch blade)
Large capacity fan for thermal power station (varlable pitch blade)

Features

  1. Suitable for ventilation with large flow rates.
  2. Can be installed either vertically or horizontally to fit the installation space.

Specifications

Tunnel ventilation: Max. spec. for 4,000 mm, single-stage, 307 m³/s 1.52 kPa, 690 kW
Thermal power stations: Max. spec. for 4,250 mm, 2 stages, 832 m³/s, 8.14 kPa, 9,100 kW

Option specifications

  • Varlable pitch blade type: A mechanism is provided for changing the blade angle as desired during operation of the fan, so the flow rate can be managed according to the objective, and running costs can be reduced.

(in-house compurison)

Fields of application

  • For ventilation in long tunnels and tunnels in cities (drawing in and expelling air)
  • Maintenance of the environment at the tunnel openings (concentrated exhaust discharge)
  • Forced draft fans and induced draft fans for thermal power stations