Purpose and characteristics
DWTThe type of roof ventilation fan is further divided intoDWT-IAxial flow roof fan;DWT-IICentrifugal roof fan;DWT-IIIThere are three types of centrifugal axial flow roof fans.
According to the requirements of pressure, air volume, and noise for the venue, the following types of fans should be selected:
1DWT-IThe axial flow roof fan is suitable for places with medium and low pressure and high flow. It can also be designed as a bidirectional rotating reversible type according to user needs, with the advantage of equivalent positive and negative working conditions. This model of fan adopts advanced technologyCADSoftware, developed through multi-objective optimization design, including machine number№12~24The fan adopts the method of using the same diameter but different speeds, different angles, and different blade shapes to meet the requirements of different working conditions, achieve matching between the fan and the system, and achieve energy saving and noise reduction.
2DWT-IIType andDWT-IIIThe centrifugal roof fan is suitable for places with low air volume and high pressure.
This model of fan has a small moment of inertia and high dynamic balance accuracy, resulting in smooth operation, and all performance indicators are higher than
The industry standard for wind turbines ensures their long-term stable operation. Impellers can be divided into steel plate, aluminum plate and glass fiber reinforced plastic according to the different materials of conveying gas, which are characterized by light weight, high strength and corrosion resistance. However, for fans with high pressure and high speed, the surface of the impeller needs to be galvanized or sprayed with plastic. In addition, this model of fan has anti-aging advantages.
type
DWT-IThe type of roof fan adopts an axial flow impeller for its impellerIIType andIIIThe model adopts a centrifugal impeller
DWT-IThe roof fan is equipped with a single layer hoodIIThe type is a three-layer hoodIIIType windless cap
DWT-IRoof fans are classified by impeller diameter№3、4、5、6、7、8、9、10、11.2、12、14、15、16、
18、20、22、24common17Individual machine number, among which№3~11.2For a fixed angle,№12~24For variable angles,№22The above is a driven axial flow roof fan
DWT-IIRoof fans are classified by impeller diameter№3、3.5、4、4.5、5、6、7、8、10, jointly9Seed machine number
DWT-IIIRoof fans are classified by impeller diameter№2.8、3.15、3.55、4、4.5、5、5.6、6.3、7.1、8、
common10Planting machine number.
working conditions
According to different environmental requirements and different conveying media, fans can be made into three types: conventional, explosion-proof, and anti-corrosion
Conventional type: Made of thin impeller plate, capable of discharging non corrosive, non flammable, and explosive gases (with dust content<100mg/m³）The working temperature shall not exceed40℃.
Explosion proof type: made of impeller aluminum plate, capable of discharging non corrosive, flammable, and explosive gases (dust content<)100mg/m³），
The working temperature shall not exceed40℃.
Corrosion type: The impeller is made of fiberglass reinforced plastic, which emits corrosive gases and does not contain any dust or gas. The working temperature should not exceed40℃.
structure
Roof fans are generally composed of air ducts and air caps（DWT-III）Composed of impeller and protective net.
The air duct is made of steel plate or fiberglass according to the different conveying media; The impeller is made of steel plates, aluminum plates, and fiberglass stamped and formed by hydraulic pressure due to the different conveying media, and is calibrated by static and dynamic balance; The hood is made of fiberglass material, with a rubber coating resin film on the outside. The curve is excessively soft, beautiful and practical. The installation of the protective net between the wind cap and the wind duct effectively protects the operator's safety after removing the wind cap of the fan.