The following is an introduction to ventilation fans that contribute to preserving the environment in tunnels.
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.
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
The following shows the model number used based on the ventilation rate. (JF: Jet fan)
| Type | JF600 | JF1000 | JF1250 | JF1500 |
|---|---|---|---|---|
| Discharge velocity | 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 |
| Efficiency | 60% or higher | 65% 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 |
| Impeller diameter | 630 mm | 1,030 mm | 1,250 mm | 1,530 mm |
| External diameter | 800 mm | 1,200 mm | 1,450 mm | 1,750 mm |
| Overall length | 3,000 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 |
| Approximate weight | 600 kg or less | 1,300 kg or less | 1,800 kg or less | 2.500 kg or less |
The following shows the model number used based on the ventilation rate. (JF: Jet 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 |
Road tunnel ventilation
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.
Large capacity fan for
tunnel ventilation
Large capacity fan for
thermal power station
Large capacity fan for thermal power station (varlable pitch blade)
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
(in-house compurison)
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