Comprehensive analysis of multi-stage centrifugal fan with welded structure
Definition and structural characteristics
The multi-stage centrifugal fan with welded structure is a high-pressure fan composed of multiple impellers connected in series, and its core components are manufactured using welding technology. Compared with single-stage centrifugal fans, multi-stage design significantly improves the wind pressure output capacity by compressing gas step by step.
The main structural features include:
Multi stage impeller design: Multiple impellers are installed on the main shaft, and the gas is gradually compressed through each stage of impellers, increasing the pressure step by step
Welded casing: Adopting a sturdy welding structure, there are two types: integral and semi open. The semi open type is easy to maintain and repair
Reflux system: guiding the airflow into the next stage impeller through a reflux device to achieve continuous compression
Precision balancing: The impeller undergoes static and dynamic balancing processes to ensure smooth operation
Main technical parameters
The key performance parameters of multi-stage centrifugal fans with welded structures include:
Typical Range Description of Parameter Categories
Airflow (Q) 3800-2220000 m ³/h Volume of air transported per unit time
Total pressure (P) 190-10000 Pa The sum of static pressure and dynamic pressure determines the conveying capacity
Power range of 0.75-500 kW, determined based on air volume and pressure requirements
Speed (n) 1450-2950 r/min directly affects air volume and pressure
Noise 65-90 dB (A) High pressure fan noise is relatively high
Working temperature ≤ 80 ℃ (normal temperature) High temperature type can reach 250 ℃
Common model parameter examples:
4-72 type: air volume 3800-168000m ³/h, total pressure 190-1700Pa
9-26 type: air volume 3780-180000m ³/h, total pressure 2100-5600Pa
G4-73 type: air volume 11000-220000m ³/h, total pressure 2300-10000Pa
Application field
Welded multi-stage centrifugal fans are widely used in the following industrial scenarios:
Industrial ventilation: ventilation and dust removal in factories, mines, tunnels, and other places
Boiler system: ventilation and induced draft of industrial boilers and kilns
Environmental engineering: environmental protection equipment such as sewage treatment, desulfurization and dust removal
Chemical metallurgy: transporting corrosive gases or high-temperature flue gas
Special occasions: flammable and explosive environments (requiring explosion-proof design), high dust environments
Supplier and Price Reference
Major domestic suppliers and product price ranges:
Shandong Zhangqiu Blower Co., Ltd
Product: C-series welded multi-stage centrifugal blower
Price: Starting from approximately 8999 yuan
Dongguan Chaoyu Fan Co., Ltd
Product: Multi wing centrifugal fan
Features: Small size, low noise, high temperature resistance
Beijing Aiter
Product: High pressure centrifugal blower
Structure: including components such as motor, filter, air chamber, etc
Price range:
Basic model: 6000-20000 yuan
High voltage/special models: 20000-100000 yuan
Selection and maintenance suggestions
Key selection points:
Match air volume and pressure based on system resistance curve
Consider the characteristics of the medium (corrosiveness, temperature, dust content)
Reserve 10-15% safety margin
Prioritize selecting high-efficiency and energy-saving models
Maintenance and upkeep:
Regularly inspect the welding area for cracks
Keep the impeller clean to prevent dust accumulation from affecting balance
Replace lubricating oil according to specifications
Monitor vibration and noise changes
