Tunnel Jet Ventilation Fans - YFTNV
Volume range: 4.2～52.3 m³/s
Static pressure range:
YFTNV/YFNV(R) jet fans are researched and designed independently by digesting and absorbing the technology of congener foreign advanced fans and making a lot of investigations and surveys in tunnel engineering systems of subway, motorway and railway. Thrust force performance and structure design of the series of jet fans can reach international advanced level, with features of high efficiency, high liability, low sound and high temperature resistance. Procedures of design and making and testing of jet fans conform with JB/T10489-2004《Technical Conditions of Jet Fan in the Tunnel》
The serials of jet fans consist of unidirectional YFTNV and bidirectional YFTNV（R）.
Unidirectional jet fans are mostly used for one direction ventilation and for counter ventilation in special conditions supplied with 50%-70% thrust force of normal direction ventilation. Bidirectional jet fans perform almost equal thrust force and airflow between normal and counter directions of ventilation.High reliable design
- -- Advanced FEA technology is used for optimized structure design and auxiliary experiment test conformation.
- -- Heat inflation of material and the strength at high temperature are fully considered when designing to ensure a high reliability of running for emergency high temperature smoke exhaust.
- -- Impeller hub and blades are pressure casted in quality high strength aluminium alloy and every blade must be qualification tested by X ray detection.
- -- Fan casing is rolled using quality steel plate by spheronization machine and fully welded, then the flanges are formed by special spin machine. So the fan casing has high structure strength.
- -- Advanced CFD technology is used for optimized design of air performance to give a good air quality.
- -- Blades with optimal airfoil profile are supplied with adjustable blade pitch in the static state to meet different working point at high efficiency.
- -- Streamlined air deflector and nozzles can improve fan air performance efficiency.
- -- Maximum thrust force can reach 3500N.
- -- Each impeller shall reach high quality dynamic balance, which ensures quiet working
- -- The length of silencers on both fan casing ends are mostly one time of impeller diameter, and two times when requiring lower sound.
- -- Fans shall work at least 60 min at 250℃,and shall not come mechanical and electrical and structural failures .
- -- Special aluminum alloy impeller with small moment of inertia has a short starting and stopping time. Fans can finish normal-reverse transfer in 60 seconds and ensure emergency quick transfer.
- -- Direct drive with no wearing parts and needs little maintenance interval.
- -- Extended lubricating pipe lead motor lubricating nipple to the fan shell with easy operating.