Gas Circulation Cooled Roots Pumps
Gas Circulation Cooled Roots Vacuum Pumps
Product Overview
Gas Circulation Cooled Roots Pumps are high-efficiency, positive-displacement vacuum boosters designed to increase pumping speed and gas throughput in heavy industrial vacuum systems.
Advanced Thermal Management
Internal gas circulation cooling redirects cooled process gas into the compression chamber. This continuous thermal control prevents localized overheating, enabling reliable operation under high differential pressures and heavy gas loads.
Typical Applications & Field Experience
Vacuum systems must be selected based on total operational dynamics rather than nominal displacement alone. Factors including working pressure, chemical load, differential pressure, and target evacuation time govern the precise configuration.
Vacuum Metallurgy & Heat Treatment: Degassing, vacuum sintering, and brazing in high-volume industrial furnaces (e.g., operating on 50 m3 vacuum heat treatment lines in Europe).
Chemical & Pharmaceutical Processing: Solvent recovery, vacuum distillation, and drying under demanding vapors.
Vacuum Coating & Electronics: High-throughput roughing and boosting for inline architectural glass, PVD, and semiconductor support systems.
Transformer & Electrical Drying: Deep evacuation of large insulation oil tanks and large-capacity transformer housings.
Centralized Vacuum Systems & OEM Equipment: Modular installation in automated manufacturing and multi-stage pump stations.
Key Features and Technical Advantages
Controlled Thermal Expansion
Internal gas injection manages temperature rise at the rotor tips, allowing continuous operation across a wider pressure band without mechanical seizure risks.
High Volumetric Efficiency
Precision rotor profiles deliver high displacement per revolution, shortening chamber pump-down times and maximizing evacuation rates compared to single-stage backing pumps.
Extended Differential Pressure Envelope
Mitigating compression heat permits higher allowable pressure differentials across inlet and exhaust ports under continuous operation.
Severe Duty Construction
Available in ductile iron, high-nickel alloys, or coated internals (e.g., PTFE, Nickel-plated) paired with mechanical seals or magnetic couplings for leak-tight containment.
Conditions Requiring Technical Evaluation
Corrosive or Reactive Vapors
Chlorine, acids, or volatile organic compounds (VOCs).
High Particulate Loads
Dust, scale, or abrasive powders (requires inlet filtration and knock-out pots).
Condensable Gas Loads
Vapors prone to liquid phase changes within the compression pocket.
Explosive Environments
ATEX Zone 1/2 or Class I, Div 1/2 hazardous locations requiring spark-proof materials and explosion-proof motors.
5-Axis CNC Rotor Profiling: Rotors are machined to tight tolerances to optimize volumetric efficiency and reduce internal slip.
Rotor-to-Housing Clearance Inspection: Critical gaps are verified with 3D Coordinate Measuring Machines (CMM) and feeler gauges to prevent thermal contact while maintaining low ultimate pressure.
Dynamic Rotor Balancing: Rotors are dynamically balanced to ISO 1940 Grade G2.5 standards to reduce vibration and extend bearing life.
Precision Timing Gears: Ground, heat-treated timing gears maintain precise rotor synchronization and quiet power transmission.
Testing, Quality Assurance, and Documentation
No-Load Running Test
Minimum 2-hour burn-in monitoring temperature rise, power draw, and mechanical stability.
Vibration & Noise Spectrum Analysis
Verified against ISO 10816 standards.
Ultimate Vacuum Verification
Performance validated against specified backing pump configurations.
Documentation Package Provided
Factory Acceptance Test (FAT) Report
Vacuum Performance & Power Consumption Curves
Dimensional GA Drawings (CAD / 3D STEP files available)
ISO 9001, CE, and Material Test Certificates (EN 10204 3.1)
Comprehensive Installation, Operation & Maintenance (IOM) Manual
Technical Specifications & Model Matrix
Core Specifications
|
Parameter |
Specification Details |
|
Pumping Principle |
Synchronized dual-rotor positive displacement vacuum booster |
|
Cooling Method |
Closed/Open-loop gas circulation heat exchanger |
|
Ultimate Total Pressure |
Up to 10^-3 mbar (system dependent) |
|
Shaft Sealing |
Double mechanical seals / Lip seals with oil flush / Magnetic drive option |
|
Motor Options |
Standard IE3/IE4 high-efficiency motors, ATEX-certified, 380V - 690V, 50/60Hz |
Model Performance Matrix
|
Model |
Nominal Pumping Speed (m3/h) |
Max Allowable Delta P (mbar) |
Motor Power (kW) |
Flange Size (Inlet/Outlet) |
Rotational Speed (RPM) |
Noise Level dB(A) |
Weight (kg) |
|
ZJP-150 |
150 |
80 |
3.0 |
DN80 / DN80 |
2900 |
< 72 |
185 |
|
ZJP-300 |
300 |
70 |
5.5 |
DN100 / DN100 |
2900 |
< 75 |
290 |
|
ZJP-600 |
600 |
60 |
11.0 |
DN150 / DN100 |
2900 |
< 78 |
480 |
|
ZJP-1200 |
1200 |
50 |
18.5 |
DN200 / DN150 |
2900 |
< 80 |
850 |
|
ZJP-2400 |
2400 |
45 |
30.0 |
DN250 / DN200 |
2900 |
< 82 |
1420 |
Lifecycle Support, Maintenance & Total Cost of Ownership (TCO)
Extended Maintenance Intervals
Initial oil change required at 3,000 operating hours; major service intervals projected at 20,000+ operating hours under clean process conditions.
Global Spare Parts Availability
Pre-packaged seal kits, bearings, and timing gears are stocked for rapid dispatch.
Technical & On-Site Field Support
Remote diagnostic support, commissioning oversight, and factory rebuild services available worldwide.
RFQ Checklist for Purchasing & System Engineers
To receive a tailored technical proposal and quotation within 24 hours, provide the following process parameter details:
Target system operating pressure (mbar / Pa) and pump-down time targets.
Vacuum chamber volume (m3) and gas load flow rate (kg/h or mbar L/s).
Process gas composition, vapor concentration, and gas inlet temperature.
Existing backing pump details (brand, model, speed) if upgrading or retrofitting.
Site electrical conditions (Voltage, Frequency, Enclosure ratings/ATEX requirement).
FAQ
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