English
Dry vacuum pump
The definition of a dry vacuum pump is a pump that does not use any fluids to create a vacuum or contact the process gas and can also discharge to atmosphere. ... Timing gears with oil reservoirs and close clearances between the rotors and housing are additional attributes that make up a dry vacuum pump.
Principle of Operation
Dry screw vacuum pumps operate with two screw rotors rotating in opposite directions. This traps the medium to be pumped between the cylinder and the screw chambers and transports it to the gas discharge. ... It also results in a lower heat load of the compressed gas.
A dry vacuum pump is an oil-free pumping system that creates vacuum conditions without contaminating the process fluid. Unlike lubricated pumps, dry vacuum pumps operate through a precisely machined gap between rotating and stationary components, eliminating the need for sealing fluids.
Key Benefits
100% oil-free operation (ideal for clean processes)
Lower maintenance costs (no oil changes/filter changes)
Environmentally friendly (no hydrocarbon emissions)
Wider chemical compatibility (can handle corrosive vapors)
Energy savings (30-50% compared to wet pumps)
Working mechanism
Multi-stage compression:
3-7 stages, the compression chamber is gradually reduced
The compression ratio of each stage is about 10:1
Thermal management:
Air cooling (standard) or water cooling (high load)
Graphite or PTFE seals can withstand temperatures above 200°C
| Type | Pressure Range | Flow Rate | Unique Feature |
|---|---|---|---|
| Claw Pump | 1000-0.1 mbar | 10-600 m³/h | Intermeshing claws |
| Screw Pump | 1000-0.01 mbar | 20-2000 m³/h | Helical rotors |
| Roots Blower | 1000-1 mbar | 100-5000 m³/h | No internal compression |
| Diaphragm Pump | 1013-1 mbar | 0.5-10 m³/h | Pulsation-free |
| Scroll Pump | 1013-0.001 mbar | 1-50 m³/h | Zero wear design |
Address
Luotuo Industrial Area, Zhenhai District, Ningbo City, China
