Centrifugal compressor DK-GF220B

airDCstationary

Overview
The DK-GF220B is an air compressor designed for higher-flow fuel cell systems. It features a two-stage supercharging architecture, an operating flow range of 20–300 g/s and a maximum motor power of 50 kW. The unit uses oil-free air (air-suspension) bearings and an IP67 protection rating, suitable for matching 150–200 kW fuel cell systems.

Key operating parameters
Flow range (g/s): 20–300
Voltage (VDC): 450–750
Speed range (rpm): 30,000–90,000
Max. motor power (kW): 50

Design highlights

• Two-stage supercharging architecture (maximum pressure ratio 3.6)
• Oil-free air (air-suspension) bearings to avoid oil contamination
• Protection level IP67 for harsh environments
• High start-stop durability: 300,000 cycles

Technical data (from table)
Spindle model: DK-GF220B
Structural form: Two-stage supercharging
Flow range (g/s): 20–300
Speed range (rpm): 30,000–90,000
Voltage (VDC): 450–750
Air compressor weight (kg): 20.5
Intake air temperature (°C): -30–45
Bearing type: Air-suspension (oil-free) bearing
Maximum compression ratio: 3.6
Max. motor power (kW): 50
Start-stop life (cycles): 300,000
Controller weight (kg): 8.0
Protection level: IP67

Specifications

• Model: DK-GF220B
• Application: Fuel cell air compressor for high-flow systems
• Architecture: Two-stage supercharging
• Flow range: 20–300 g/s
• Speed range: 30,000–90,000 rpm
• Operating voltage: 450–750 VDC
• Maximum motor power: 50 kW
• Bearing type: Air-suspension (oil-free) bearing
• Unit weight: 20.5 kg (compressor); 8.0 kg (controller)
• Intake air temperature range: -30 to 45 °C
• Start-stop life: 300,000 cycles
• Protection rating: IP67