XinFeng Classroom | XFJ-YJ Series High-Pressure Centrifugal Fans Expansion Division XinFeng Fans January 18, 2021 12:00

01  

XFJ-YJ Series Models and Angles  

XFJ-YJ is a single-suction type, typically available in 13 sizes: 3.5A, 4A, 4.5A, 5A, 5.6A, 6.3A, 7.1D, 8D, 9D, 10D, 11.2D, 12.5D, and 14D. Typically manufactured in both clockwise and counterclockwise configurations. When viewed from the motor end, impellers rotating clockwise are designated as clockwise fans, denoted by "Right"; those rotating counterclockwise are designated as counterclockwise fans, denoted by "Left". Fan outlet positions are indicated by the housing outlet angle. Both "Left" and "Right" configurations can be produced in four angles: 0°, 90°, 180°, and 270°.

02 

Installation of XFJ-YJ High-Pressure Centrifugal Fans

    Before Installation: Conduct a comprehensive inspection of all fan components. Verify that all parts are present, the rotation direction of the impeller matches that of the casing, and all connections are secure. Check for damage to major components such as the impeller, main shaft, and bearings, and ensure the drive assembly operates smoothly. During Installation: Carefully inspect the casing to ensure no tools or debris have fallen or been left inside. Apply a layer of grease or machine oil to mating surfaces to prevent rust and facilitate future disassembly. Align the fan with the foundation base. When connecting inlet/outlet ducts, adjust for natural alignment without forcing connections. Never impose duct weight onto fan components. Ensure the fan remains level throughout installation.

03 

Operation of XFJ-YJ High-Pressure Centrifugal Fans

     1: Check whether the fan's regulating damper and inlet/outlet dampers are open; 2: Manually rotate the fan to inspect clearances between components; check for friction when turning the impeller against the casing; 3: Ensure coupling guards and pulley guards are properly installed; 4: Verify the bearing housing oil level meets operational lubrication requirements; 5: For fans with water-cooled bearings, inspect the cooling water supply for adequacy; 6: Confirm the motor's rotation direction and check for water/oil leaks, vibrations, abnormal noises, or unusual odors.

04  

Maintenance of XFJ-YJ High-Pressure Centrifugal Fans  

I. Precautions for Fan Maintenance:  

Operate the fan only when the equipment is fully functional. When starting the fan after maintenance, carefully inspect all components for proper operation. Regularly remove accumulated dust, dirt, and other contaminants from the fan interior to prevent rust. For personal safety, all maintenance must be performed with the fan stopped. II. Precautions for Normal Fan Operation: During startup, shutdown, or operation, immediately inspect any abnormal conditions. For minor faults, promptly identify causes and resolve them. For major faults, stop the fan immediately for repair. Replace lubricants after each maintenance session. Under normal conditions, replace lubricants based on actual usage.

05 

Common Faults and Causes of XFJ-YJ High-Pressure Centrifugal Fans

    I. Severe Fan Vibration    Misalignment between fan shaft and motor shaft; misaligned pulley grooves; friction between casing/inlet and impeller; insufficient foundation rigidity or instability; loose impeller rivets or impeller deformation; loose fit between impeller shaft flange bore and shaft; Loose connecting bolts between casing, bearing housing, and support frame; between bearing housing and bearing cover; improper installation of inlet/outlet ducts causing resonance; rotor imbalance due to blade dust/debris accumulation, blade wear, impeller deformation, or shaft bending. II. Excessive Bearing Temperature Rise Severe vibration in the bearing housing; poor lubricant quality, deterioration, or contamination with dust, sand, dirt, or other impurities; insufficient lubricant quantity; excessive or insufficient tightening of bolts connecting the bearing housing cover and base; misalignment between the shaft and rolling bearings, or misalignment between the front and rear shafts; damaged rolling bearings or shaft bending. III. Excessive Motor Current or Overheating     Inlet and outlet valves left open during startup; low motor input voltage or single-phase power failure; severe vibration affecting the bearing housing; main shaft speed exceeding rated value.

Advantages of the XFJ-YJ High-Pressure Centrifugal Fan

     The impeller features forward-curved blades. After forming, the impeller undergoes static and dynamic balancing, ensuring excellent air performance, high efficiency, and stable, reliable operation. The inlet is designed as a converging streamlined monoblock structure mounted on the fan's side. Its cross-section parallel to the shaft features a curved profile, enabling smooth gas entry into the impeller with minimal pressure loss.