Product Overview
A single stage oil-sealed rotary vane vacuum pump is a positive displacement mechanical pump engineered for stable evacuation performance in the low and medium vacuum range. Operating between atmospheric pressure (1013 mbar) and ultimate pressures down to 0.1 mbar (10 Pa), these pumps provide continuous displacement capacity for industrial machinery, packaging systems, and process lines.
Technical Specifications
|
Parameter |
20 m3/h Model |
63 m3/h Model |
100 m3/h Model |
250 m3/h Model |
630 m3/h Model |
|
Nominal Pumping Speed (50 Hz) |
20 m3/h |
63 m3/h |
100 m3/h |
250 m3/h |
630 m3/h |
|
Nominal Pumping Speed (60 Hz) |
24 m3/h |
75 m3/h |
120 m3/h |
300 m3/h |
750 m3/h |
|
Ultimate Partial Pressure (Gas Ballast Closed) |
<= 0.5 mbar |
<= 0.1 mbar |
<= 0.1 mbar |
<= 0.1 mbar |
<= 0.1 mbar |
|
Ultimate Total Pressure (Gas Ballast Open) |
<= 1.5 mbar |
<= 1.0 mbar |
<= 1.0 mbar |
<= 0.8 mbar |
<= 0.8 mbar |
|
Motor Power (50 Hz) |
0.75 kW |
1.5 kW |
2.2 kW |
5.5 kW |
15.0 kW |
|
Noise Level (ISO 2151) |
62 dB(A) |
65 dB(A) |
67 dB(A) |
72 dB(A) |
75 dB(A) |
|
Inlet / Outlet Connection |
G 3/4" Thread |
G 1-1/4" Thread |
G 1-1/4" Thread |
ISO-KF PN40 / G 2" |
DN100 PN10 / G 2" |
|
Oil Capacity |
0.5 L |
2.0 L |
2.0 L |
6.5 L |
15.0 L |
|
Operating Temperature |
72 deg C |
75 deg C |
78 deg C |
82 deg C |
85 deg C |
Mechanical Construction & Materials
Key internal components are manufactured to specific metallurgical standards to withstand continuous mechanical stress and thermal loading:
Pump Stator Housing: High-density FC25 fine-grain gray cast iron, stress-relieved to prevent thermal warping during high-load continuous operation.
Internal Rotor: Precision-ground ductile iron (QT450) mounted eccentrically relative to the stator bore.
Sliding Vanes: High-density fiber-reinforced composite material featuring low thermal expansion coefficient and resistance to mechanical wear.
Elastomer Seals: Fluorocarbon rubber (Viton / FKM) internal shaft seals and O-rings, temperature rated up to 180 deg C.
Exhaust Filtration System: Multi-stage internal oil mist separator with synthetic fiber elements achieving 99.9 percent oil filtration efficiency, returning oil to the reservoir via an internal recirculation channel.
Gas Ballast Valve: Adjustable manual gas ballast valve for managing water vapor and preventing condensation build-up in the oil chamber.
Operating Principle & Internal Mechanics
The pump operates using a four-stroke positive displacement mechanism inside an oil-sealed chamber:
Suction: Centrifugal force presses the sliding vanes against the inner stator wall as the eccentric rotor turns. The volume between two adjacent vanes expands, creating a pressure differential that draws gas from the inlet port.
Isolation: The trailing vane passes the inlet port, isolating a fixed volume of gas inside the pump chamber.
Compression: Continued rotor rotation reduces the chamber volume, compressing the trapped gas.
Exhaust: When gas pressure exceeds atmospheric pressure plus exhaust valve spring tension, the exhaust valve opens, discharging gas and oil mist into the oil separation housing.
Quality Control & Factory Testing Protocols
To ensure field reliability and compliance with international industrial standards, every manufactured vacuum pump undergoes strict inspection before packaging:
Dimensional Inspection: Coordinate measuring machine (CMM) verification of stator bores, rotor eccentricity, and vane slots to sub-micron accuracy.
Helium Leak Testing: Mass spectrometer helium leak testing applied to all welded joints and housing castings to ensure leak rates below 1 x 10^-6 mbar x L/s.
Performance Run-In Test: 4-hour continuous full-load operational test monitoring ultimate pressure, motor current draw, operating temperature stability, and noise emission level under ISO 2151 guidelines.
Troubleshooting Guide
|
Symptom |
Possible Mechanical Cause |
Action Required |
|
Pump fails to reach specified ultimate vacuum |
Vacuum oil degraded or contaminated with water |
Replace oil; run pump with gas ballast open for 30 minutes. |
|
Exhaust oil mist filter saturated |
Replace exhaust filter elements. |
|
|
Leakage in inlet piping seals or shaft seal |
Conduct helium or pressure decay leak test; replace damaged seals. |
|
|
Excessive oil mist emitted from exhaust |
Exhaust filter saturated, clogged, or misaligned |
Replace exhaust filter cartridge and inspect internal bypass valve seal. |
|
Elevated operating temperature (> 90 deg C) |
Insufficient cooling airflow or dirty cooling fins |
Clean motor fan cowl and external pump cooling fins. |
|
Low oil level or incorrect oil viscosity |
Check oil level; refill with standard ISO VG 68 vacuum oil. |
|
|
Abnormal metallic noise during startup |
Cold start with high viscosity oil or worn rotor vanes |
Check ambient temperature; verify oil grade; inspect sliding vanes for wear. |
Storage, Transport, and Commissioning
Storage Guidelines
Environment: Store indoors in a dry location between 5 deg C and 40 deg C.
Port Protection: Keep factory blanking flanges attached to inlet and outlet ports until final pipeline connection to block dust and moisture.
Long-Term Storage: For storage exceeding 6 months, rotate the pump shaft manually every 3 months to prevent internal sticking.
Transport Instructions
Lifting: Use designated base lifting slots or pump housing eyebolts. Never lift the complete unit using the motor eyebolt alone.
Orientation: Keep the pump strictly horizontal during transport to prevent oil from flooding the exhaust filters.
Initial Commissioning Checklist
Oil Level: Verify oil level reaches the center mark of the sight glass before startup.
Rotation Direction: Jog the motor briefly to check rotation against the housing arrow. Incorrect wiring causes immediate lubrication failure.
No-Load Run Test: Run the pump for 15 minutes with the inlet isolated and gas ballast open to verify operating temperature, noise levels, and oil separation before full system connection.
FAQ
Q: What is the difference between a single-stage and a two-stage rotary vane vacuum pump?
A: A single-stage pump uses one compression chamber and is designed for applications in the low to medium vacuum range (typically achieving ultimate pressures down to 0.1 mbar). A two-stage pump adds a second compression stage in series, allowing it to reach deeper ultimate vacuum levels (down to 0.001 mbar range). Single-stage models are ideal for general industrial processes where extreme vacuum is not required, offering simpler maintenance and higher pumping speeds at moderate pressure levels.
Q: Can a single-stage rotary vane vacuum pump handle continuous 24/7 operation?
A: Yes, industrial-grade models are engineered for continuous operation provided that operating temperatures, oil levels, and ambient ventilation are properly maintained. However, for continuous operation near ultimate vacuum pressure without gas ballast, thermal load and oil degradation must be monitored closely through scheduled inspections.
Q: What type of vacuum oil should be used, and can automotive or hydraulic oils be substituted?
A: Only high-grade mineral or synthetic oils specifically formulated for rotary vane vacuum pumps (typically ISO VG 68 viscosity grade) should be used. Never use automotive engine oil, hydraulic fluid, or gear oil. Alternative oils have different vapor pressures, oxidation stabilities, and demulsibility properties, which can cause severe foaming, poor ultimate vacuum, and accelerated internal mechanical wear.
Q: How does high ambient temperature affect pump performance?
A: Operating ambient temperatures exceeding 40 deg C can cause the pump oil to overheat, reducing its viscosity and sealing capability. This leads to higher operating temperatures, accelerated oil breakdown, and a drop in ultimate vacuum performance. Adequate room ventilation and clean cooling fins are essential in warm environments.
Q: What is the function of the internal anti-suckback valve?
A: The anti-suckback valve is an automatic mechanical check valve located at the inlet port. When the pump is powered off or experiences an unexpected power failure, the valve closes instantly under differential pressure, preventing vacuum oil from being sucked backward into the customer's intake piping and vacuum chamber.
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