To complete the fan system settings must obtain the motor and impeller parameters

Generally, there are two types of fan structure, one is that a fan support is connected to the shell and a double-layer water-cooled motor cover is installed at the same time, and the seal ring is on the bearing (on either side of the contact surface of the bearing and the motor cover flange). Open the seal groove) seal. The other structure is a hydraulic fan drive device, the main feature is the direct use of hydraulic flange mounting surface as a static sealing surface, eliminating a cooling water cover, the structure is simple, reliable sealing. The selection method is determined by the vacuum furnace mechanical driving force requirements.

The fan section consists of fan blades and a strong cold motor. Among them, centrifugal impellers are often used for fan impellers to facilitate the control of the air flow direction. The common plate flange duct impeller material is determined by the actual operating temperature, and generally it can be ordinary carbon steel. Impeller diameter can be obtained according to the formula: Q = 3600SV Type: Q - motor air flow (m3/h) S - cross-sectional area of ​​the furnace near the workpiece (m2) V - gas flow velocity (m/s) from above The formula can be used to obtain the gas flow rate. Based on the motor power and air volume calculation, the parameters such as the number of motor revolutions of the impeller diameter can be determined. The air volume is usually determined by the wind speed. If the wind speed of the Hebei conveyor belt manufacturer is too small, the cooling effect cannot be achieved. If the wind speed is too large, the power consumption increases, and the components in the furnace are ignored. As for the calculation of wind speed, there has been no accurate and effective method. The general experience is that it is appropriate to take the average wind speed of the empty space in the furnace to be about 10 m/s.

Motor power can be calculated by the following formula: N = QHK/37440η1η2 where: N - motor power (KW) Q - motor air flow (m3/h) H - motor full air pressure (Pa) K - motor capacity safety When the coefficient is N≤0.5kW, K=1.5; 0.5≤N≤1, K=1.4; 1≤N≤2, K=1.3; 2≤N≤5, K=1.2;5NK, K=1.15; η1― ―Motor efficiency, low-voltage motor η1=0.4; medium-voltage motor η1=0.5; η2―mechanical efficiency, motor directly coupled to the drive η2=1; coupling transmission η2=0.98, belt drive η2=0.95; thus available The parameters of the motor and impeller can be used to complete the design of the entire fan system.

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