Screw pressure booster

impellergasoil-free

Introduction
KAISHAN subsidiary Chongqing Kaishan Fluid Machinery Co., Ltd. designs and manufactures fluid machinery including screw vacuum pumps, oil‑free screw blowers, magnetic‑levitation blowers and developing dry pump series. Products are engineered for industrial applications requiring clean, efficient vacuum and compressed air solutions.

Vacuum pumps
Designed for optimized performance in specific duty points, the screw vacuum pumps deliver high pumping speed and low energy consumption for targeted operating ranges. Wear parts are minimized and package size is compact. An internally developed inlet valve enables pressure‑differential oil injection control; elimination of forced oil‑pump injection reduces parasitic losses and failure modes in oil‑free operation. Inlet valve volumetric control combined with permanent‑magnet motor speed regulation creates an n‑type pump curve, keeping the pump within optimal performance over 5–350 mbar. A proprietary end‑of‑pump purge strategy reduces decline in gas throughput at high vacuum and stabilizes operation. KAISHAN’s permanent‑magnet speed control system and advanced PID control match inlet valve and pump speed to maintain stable pressure and maximize pumping capacity.

Innovative mainframe design
Machine core uses a Y‑type rotor profile with a triple bearing arrangement (cylindrical + tapered roller bearings) delivering bearing life >100,000 hours. Low‑speed large rotor head design improves stability and reduces acoustic emissions. Integrated construction simplifies installation.

Supply range (vacuum pumps)

• Power: 11 kW ~ 160 kW
• Pumping speed: 6.9 m3/min ~ 96.9 m3/min
• Ultimate pressure: 0.5 mbar(A), 0.67 mbar(A)

Vacuum pump application fields

• Medical: hospital central systems, enclosure suction, laboratory central vacuum
• Pharmaceutical: de‑aeration of creams and powders, vacuum filling, suction filtration
• Electronics: component handling, PCB manufacture, central vacuum systems
• Food: poultry processing, coffee, packaging, cheese processing, vacuum cooling of produce
• Material handling: automated test equipment, pick‑and‑place, bulk conveying, vacuum handling
• R&D: laboratory central vacuum, vacuum drying and distillation systems
• Printing & paper: bookbinding, newspaper/magazine printing, degassing adhesives
• Processing industry: CNC cutting, thermoforming, extrusion, mold degassing, material processing
• Other: ceramics, vacuum suction/handling, battery manufacturing, packaging and baking

Blowers
KAISHAN oil‑free screw blowers use in‑house developed high‑efficiency screw rotor profiles. Male and female rotors run with high‑precision synchronized gears and the compression chamber is sealed from bearings to maintain oil‑free compressed air. The design supports internal compression, high thermal efficiency and good dynamic balance. Units can be installed without foundations; air pulsation and noise are minimized. Integrated control supports unmanned operation and remote control. Options include check valve, overpressure relief valve, start‑unload valve. Belt‑drive packages can be fitted with VFDs; direct‑coupled units come standard with permanent‑magnet VFD motors and inverters.

Blower technical features

• High efficiency: favorable performance curves for reliable, energy‑efficient operation
• Low noise: noise levels compliant with national standards
• Long lifetime: SKF high‑speed bearings, bearing life >100,000 hours; overall design life >30 years
• Flexible flow control: VFD + PID enables precise flow matching to duty and energy savings
• Multiple control modes: oxygen concentration control or pressure control available
• Advanced integration: integrated VFD packages for simple installation and stable operation
• Easy maintenance: standard motors and mainframes, belt flexible coupling or direct coupling for onsite serviceability

Blower application fields
Wastewater aeration, equalization processes, air–water backwash, desulfurization oxidation, pneumatic conveying, biopharmaceutical fermentation, printing, paper, galvanizing, textiles, etc.

Features / specifications (technical summary)

• Main rotor profile: Y‑type rotor line
• Bearings: triple arrangement with cylindrical and tapered roller bearings, life >100,000 hours
• Motor & controls: permanent‑magnet speed control, VFD motor control, advanced PID matching with inlet valve volumetric control
• Optimal vacuum range: best performance across 5–350 mbar
• Vacuum pump power range: 11 kW ~ 160 kW
• Vacuum pump pumping speed range: 6.9 m3/min ~ 96.9 m3/min
• Ultimate pressure: 0.5 mbar(A), 0.67 mbar(A)
• Design life: overall machine design life >30 years