DRETOP SJR-600 Dry Screw–Roots Vacuum Pump Unit

Overview

The DRETOP SJR-600 is a two-stage dry vacuum pumping system integrating a variable-pitch dry screw vacuum pump as the forepump and a high-capacity roots vacuum pump as the booster stage. Engineered for continuous, oil-free operation in demanding industrial and laboratory environments, it employs positive displacement via synchronized, non-contacting screw rotors and roots lobes—eliminating lubricants from the gas path and ensuring contamination-free vacuum generation. Its design conforms to fundamental principles of dry compression thermodynamics and dynamic gas flow management, enabling stable evacuation across a wide pressure range—from atmospheric conditions down to ≤1 Pa—without reliance on oil seals or liquid ring media. This architecture delivers intrinsic compatibility with reactive, condensable, or particulate-laden process gases common in semiconductor fabrication, pharmaceutical lyophilization, vacuum metallurgy, and advanced battery material synthesis.

Key Features

• Dry, oil-free compression: Fully sealed working chambers with no internal lubrication; eliminates hydrocarbon backstreaming and ensures ultra-clean vacuum critical for thin-film deposition and analytical instrumentation.
• Variable-pitch screw technology: Optimized rotor geometry provides progressive compression, reducing discharge temperature and improving energy efficiency compared to fixed-pitch equivalents.
• Water-cooled thermal management: Integrated closed-loop cooling circuit maintains rotor and bearing temperatures below 80 °C under full load—reducing thermal drift and extending service intervals.
• Robust particulate tolerance: Straight-through gas path and gap-sealed rotor housing minimize particle accumulation; compatible with optional nitrogen purge (N₂ blow-down) for silicon, graphite, or metal dust environments.
• Vibration-damped mechanical architecture: Precision-balanced rotors mounted on double-row angular contact bearings, coupled with multi-layer elastomeric isolation mounts, achieve <4.5 mm/s RMS vibration at operating speed.
• Corrosion-resistant surface options: Optional electroless nickel-phosphorus (ENP) or ceramic composite coatings on rotors and chamber walls for sustained performance in HCl, HF, NH₃, or organic solvent vapors.

Sample Compatibility & Compliance

The SJR-600 accommodates complex gas matrices including water vapor (up to 95% relative humidity), acidic or alkaline vapors (e.g., Cl₂, SO₂, NH₃), and submicron particulates (down to 0.3 µm). It meets ISO 2858 for pump dimensional interchangeability and complies with ASTM F2439-22 for vacuum system validation in regulated manufacturing. As a CE-marked device, it satisfies EN 61000-6-4 (EMC emission) and EN 60204-1 (electrical safety). When configured with optional PLC control and audit-trail logging, the unit supports GLP/GMP-aligned vacuum process documentation per FDA 21 CFR Part 11 requirements.

Software & Data Management

Standard configuration includes an integrated digital controller with RS-485 Modbus RTU interface for integration into SCADA or MES platforms. Optional PLC-based automation enables real-time regulation of pump speed (via VFD on both stages), pressure cascade control, and interlocked nitrogen purge sequencing. All operational parameters—including inlet pressure, motor current, coolant flow rate, and bearing temperature—are logged with timestamped records. Firmware supports configurable alarm thresholds, event-driven data export (CSV), and remote diagnostics via secure Ethernet connection—facilitating predictive maintenance planning and traceability in validated environments.

Applications

• Semiconductor & ALD/CVD processes: High-throughput chamber evacuation prior to plasma-enhanced film growth; handles silane, TiCl₄, and TMA without catalyst poisoning or residue buildup.
• Pharmaceutical freeze drying: Stable low-pressure maintenance during primary drying phase; tolerates large water vapor loads without performance degradation.
• Lithium-ion battery electrode drying: Continuous removal of NMP solvent vapors under inert atmosphere; avoids thermal decomposition due to low exhaust temperature (<75 °C).
• Vacuum brazing & sintering: Maintains ≤1 Pa uniformity across large-volume furnaces while resisting metal oxide dust ingress.
• Research-scale vacuum metallurgy: Supports high-purity metal evaporation and reactive sputtering where hydrocarbon contamination must remain below 10⁻¹⁰ Torr·L/s.

FAQ

What is the recommended maintenance interval for the SJR-600 under continuous operation?
Scheduled inspection every 2,000 hours; full rotor alignment and coating integrity check every 8,000 hours. No oil changes required.
Can the SJR-600 be used as a standalone pump, or does it require a backing pump?
It is a complete two-stage unit—no external backing pump is needed. The integrated screw stage serves as the forepump for the roots stage.
Is the system compatible with aggressive halogenated process gases?
Yes—when equipped with ENP or Al₂O₃-coated internals and fluorocarbon elastomer seals, it withstands Cl₂, F₂, and CF₄ exposure per ASTM D1418 classification.
Does the unit support vacuum level ramping profiles for sensitive thermal processes?
Yes—via optional PLC controller with programmable pressure ramps, dwell times, and multi-step evacuation sequences.
What certifications are provided for IQ/OQ validation in pharmaceutical facilities?
Factory-issued FAT report, calibration certificates for all sensors, and 21 CFR Part 11-compliant electronic log files are available upon request.