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Dry Screw Vacuum Pump
Product Details
The dry screw vacuum pump does not use a liquid as the sealing fluid; instead, it uses a pair of screw rotors that rotate synchronously and at high speed in opposite directions within the pump chamber to create suction and exhaust. After precision dynamic balancing, the two screw rotors are mounted in the pump chamber supported by bearings, and a certain gap is maintained between the screws so there is no friction, resulting in stable operation, low noise, and no need for lubricating oil in the working chamber. Therefore, dry screw vacuum pumps are suitable for extracting gases containing large amounts of water vapor and small amounts of dust. Because gas compression causes a higher temperature at the exhaust port, dry screw vacuum pumps are less likely to produce condensation inside, which is beneficial for discharging some high-vapor-pressure media such as dichloromethane and acetone in gaseous form from the exhaust port.
In many chemical and pharmaceutical applications, vacuum pumps are needed to extract excess solvents from process workflows, such as drying, evaporation, concentration, purification, and cleaning. Many organic solvents need to be recovered again because of their toxicity, flammability, and environmental impact. Dry screw vacuum pumps can very effectively achieve recovery. After passing through the dry screw vacuum pump, solvent vapor is directly recovered at the exhaust port through a condenser without contamination.
If a higher pumping speed is required, a vacuum unit combining a Roots vacuum pump and a dry screw vacuum pump can be used.
Without internal compression, steam is less likely to be compressed and condensed inside the pump
During rough vacuuming, the maximum pumping speed can also be maintained
Lower exhaust temperature
Internal compression exists, resulting in lower energy consumption
Double-screw pumping: non-contact compression, the screw rotors do not wear, and operation is reliable. High vacuum level: stable pumping speed can be maintained independently from atmospheric pressure to 1 Torr (133 Pa), and vacuum performance is not affected by changes in environment, season, or operating conditions. No oil or water in the pump chamber: the dry screw vacuum pump process contains no oil or water, so no wastewater or waste oil is generated, greatly reducing pollution, and it allows the use of nitrogen, steam, solvents, and other gas to flush the pump body.
Corrosion-resistant design: after Hastelloy alloy coating treatment, it can be used to transport toxic, corrosive, and condensable gases. Smooth exhaust port structure: the gas path is short, allowing gases to be discharged quickly. The straight-through pump body structure can carry liquid, which helps handle condensate and small particle discharge inside the pump, and it has excellent liquid handling capability. The exhaust port can directly recover solvents and some high-value process media. Spiral jacket cooling structure: the spiral jacket has excellent cooling performance, low operating temperature, and a unique jacket water-cooling structure, with outlet temperature reduced to meet or approach the T4 requirement. Reliable sealing structure: mechanical seal and lip seal are adopted; according to operating requirements, an air or nitrogen gas barrier can be set before the mechanical seal to prevent dust and other impurities from entering the pump
inside.
IEC flange: The C-flange design is convenient for installation, reduces noise, solves coupling alignment issues, and the enlarged screw threads prevent deformation and vibration.
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