10-20 Type High-Pressure Centrifugal Fan

Generally used in industries such as metallurgy, petroleum, chemical engineering, grain processing, and building materials for high-pressure forced air supply or pneumatic conveying of solids and bulk materials. It is suitable for conveying air and gases that are non-corrosive, non-explosive, non-self-igniting, and free of sticky substances. The temperature of the medium typically does not exceed 50°C (with a maximum limit of 80°C), and the concentration of dust and hard fine particles in the medium should be no greater than 150 mg/m³.

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Usage

Application: This fan is typically used in industries such as metallurgy, petroleum, chemical engineering, grain processing, and building materials for high-pressure forced air supply or pneumatic conveying of solids and bulk materials. It is suitable for conveying air and gases that are non-corrosive, non-explosive, non-self-igniting, and free of sticky substances. The temperature of the medium generally does not exceed 50°C (with a maximum allowable temperature of 80°C). The concentration of dust and hard fine particles in the medium should not exceed 150 mg/m³.

Style

1. The fans are designed with single-inlet configurations, and the fan models include No.8a, 8, 8b, 8.5a, 8.5, 8.5b, 9a, 9, and 9b—totaling nine models.

2. The fan can also be manufactured in two rotation directions: clockwise or counterclockwise. When viewed from the front of the transmission unit, if the impeller rotates clockwise, the fan is referred to as a “clockwise” fan and denoted by the symbol “Shun”; if it rotates counterclockwise, the fan is called a “counterclockwise” fan and denoted by the symbol “Ni.”

3. The outlet position of the fan is indicated by the angle of the air outlet on the fan casing. Both “clockwise” and “counterclockwise” can be manufactured in three angles: 0°, 90°, and 180°.

4. All fans are driven directly via D-type couplings.

Structural features

Structural features: The fan consists of components such as an impeller, a casing, an air inlet, and a transmission unit.

① Impeller—Made of Q345 (16Mn). It features 12 forward-curved blades, both long and short, evenly spaced and welded between a four-arc-shaped shroud and a flat impeller disk, forming a flow passage equipped with a bladeless diffuser. The impeller has undergone static and dynamic balancing corrections, ensuring smooth and reliable operation.

② Housing — A high-quality galvanized steel sheet welded into an integral spiral-shaped housing.

③ Air inlet— The air inlet, designed with a converging and diverging structure, is made as an integral unit and secured to the front cover plate using bolts.

④ Drive Assembly— Composed of a main shaft, bearing housing, coupling, and other components. The main shaft is made of high-quality steel, and the bearing housing features an integral structure equipped with rolling bearings. The rolling bearings are lubricated with total-loss system oil.

Performance and Selection

The performance of this fan is converted based on the fan characteristic curves provided without considering the compression correction factor.

1. The design and operating units shall, based on the required flow rate and total pressure, determine the fan model number, flow rate, static pressure, and matching motor from the performance and accessory selection table. If the motor specifications are changed, ensure that the speed and power remain consistent, and specify this in the order.

2. The operating points at each rotational speed listed in the performance and optional components table are obtained by artificially dividing the continuous pressure-flow curve—within the range where the dimensionless characteristic curve of the fan shows a total pressure efficiency greater than 83%—into 11 evenly spaced performance points for selection. When placing an order, refer to the performance table as the standard.

3. The performance of the fan during factory inspection shall ensure that, at the required flow rate, the deviation of the total pressure value does not exceed ±5% of the designed total pressure value.

4. Performance and Optional Components Table: Calculations are based on standard air conditions at a gas temperature of t = 20°C, atmospheric pressure p = 101,300 Pa, and gas density ρ = 1.2 kg/m³.

5. If the fan operates under conditions that are not standard, its performance should be converted using the relevant formulas.

6. In the performance and optional components table:

(In the formula, p, q, and η represent the fan’s flow rate (m³/h), total pressure (Pa), and air efficiency, respectively.)

7. Mechanical efficiency of the fan: For this series of fans driven by a coupling, η1 = 0.98; K is the motor capacity reserve factor, which for this fan is taken as 1.15. The selected motor power should generally not be lower than the required power value.

Keywords:

10-20 Type High-Pressure Centrifugal Fan

Category:

Industrial centrifugal fan