Pump Rotor/Vanes: Rotor Diameter 50-300 mm

Component Specifications

Definition

The pump rotor/vanes assembly consists of a central rotor mounted eccentrically within a cylindrical stator housing, with multiple sliding vanes (typically 4-12) that extend radially due to centrifugal force and maintain contact with the stator wall. As the rotor rotates, the vanes create expanding and contracting volumes that draw in, compress, and exhaust gases, generating vacuum through positive displacement. This component is critical for maintaining consistent vacuum pressure, flow rates, and energy efficiency in industrial vacuum systems.

Working Principle

Operates on the rotary vane principle: an eccentrically mounted rotor with spring-loaded or centrifugal vanes rotates inside a cylindrical chamber. The vanes slide in and out of rotor slots, creating sealed chambers that expand during intake (drawing in gas) and compress during exhaust (expelling gas). The continuous rotation creates a steady vacuum flow with minimal pulsation.

Materials

Rotor: Hardened steel (AISI 4140/4340), stainless steel (316L), or aluminum alloy (7075-T6) with surface treatments (nitriding, chrome plating). Vanes: Carbon graphite, phenolic resin composites, or PTFE-filled materials for low friction and self-lubrication. Some high-performance versions use ceramic-coated steel vanes.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Vane Count	4-12 vanes
Vacuum Level	10^-3 to 10 mbar
Rotor Diameter	50-300 mm
Surface Finish	Ra 0.4-0.8 μm
Rotational Speed	500-3600 RPM
Clearance Tolerance	0.02-0.05 mm
Operating Temperature	-20°C to 120°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 21360-1, ISO 21360-2, DIN 28400, DIN 28401

Parent Products

This component is used in the following industrial products

Vacuum Pump/Motor

A combined vacuum pump and motor assembly that generates suction for vacuum extraction systems

View Product Details

Engineering Analysis

Risks & Mitigation

Vane fracture leading to catastrophic pump failure
Excessive clearance causing vacuum loss
Material incompatibility with pumped media
Thermal expansion mismatch
Rotor imbalance causing vibration

FMEA Triads

Trigger: Insufficient lubrication or dry running
Failure: Excessive vane and stator wear, overheating
Mitigation: Implement automatic lubrication systems, install low-oil sensors, use self-lubricating vane materials

Trigger: Particulate contamination entering pump
Failure: Abrasive wear on vanes and rotor surfaces
Mitigation: Install proper inlet filters, use cyclone separators, implement regular maintenance schedules

Trigger: Corrosive gases in vacuum stream
Failure: Material degradation and pitting
Mitigation: Select corrosion-resistant materials (stainless steel, special coatings), install gas ballast systems

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Radial runout: ≤0.02 mm, Vane slot clearance: 0.01-0.03 mm, Concentricity: ≤0.015 mm TIR

Test Method

Dimensional inspection via CMM, vacuum performance testing per ISO 21360, material hardness testing (Rockwell C), surface roughness measurement, dynamic balancing to ISO 1940 G2.5

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Pump Rotor/Vanes

Manufacturer profiles associated with Pump Rotor/Vanes.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

How often should pump vanes be replaced?

Vane replacement intervals depend on operating conditions: typically 2000-8000 hours for standard applications. Contaminated environments or dry running conditions may require more frequent replacement (1000-3000 hours).

What causes premature vane wear?

Common causes include: insufficient lubrication, particulate contamination in the vacuum stream, moisture condensation, improper vane material selection for the application, and operating beyond recommended temperature ranges.

Can different vane materials be mixed in the same rotor?

No. Mixing vane materials can cause uneven wear, imbalance, and reduced vacuum performance. Always use matched sets of identical vane material and dimensions specified by the pump manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Pump Rotor/Vanes