Stator Housing: Pressure Range 10^-3 to 1013 mbar

Component Specifications

Definition

The stator housing is a critical structural component in primary (roughing) pumps, typically constructed as a cylindrical or multi-chambered casing that houses the stator, rotor, and internal vanes. It maintains precise internal geometries to ensure proper clearance between moving parts, contains the pumped medium, and often incorporates cooling channels, mounting flanges, and port connections. In industrial vacuum systems, it withstands pressure differentials, thermal expansion, and mechanical stresses while maintaining dimensional stability under continuous operation.

Working Principle

The stator housing provides a sealed, rigid enclosure that maintains the stator's fixed position relative to the rotating rotor. During pump operation, it contains the vacuum chamber where gas molecules are trapped and expelled through mechanical displacement (typically via rotary vane, claw, or screw mechanisms). The housing's internal surfaces guide fluid flow, dissipate heat from compression, and ensure minimal clearance gaps to prevent backflow and maintain pumping efficiency.

Materials

Cast iron (GGG-40/50), ductile iron, aluminum alloys (AlSi10Mg), or stainless steel (AISI 304/316) depending on corrosion resistance and thermal requirements. Internal surfaces may be machined, coated (e.g., nickel-plated), or polished to reduce friction and outgassing.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Cooling Method	Air-cooled fins or water-cooling jackets
Pressure Range	10^-3 to 1013 mbar
Surface Finish	Ra ≤ 1.6 μm (internal bore)
Max Temperature	120°C (standard) / 200°C (high-temp variants)
Port Connection	ISO-KF, CF, or ANSI flanges

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, DIN 28400, ISO 1608

Parent Products

This component is used in the following industrial products

Primary (Roughing) Pump

A vacuum pump used to initially evacuate a system from atmospheric pressure to an intermediate vacuum level.

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Engineering Analysis

Risks & Mitigation

Thermal deformation under continuous operation
Internal corrosion from pumped media
Mechanical fatigue at flange connections
Leakage due to seal degradation

FMEA Triads

Trigger: Thermal cycling and uneven cooling
Failure: Housing distortion leading to increased rotor-stator clearance
Mitigation: Implement uniform cooling channels, use low-expansion alloys, and apply thermal stress analysis in design

Trigger: Corrosive media exposure
Failure: Pitting and wall thinning, causing leaks or structural weakness
Mitigation: Select corrosion-resistant materials (e.g., stainless steel), apply protective coatings, and include inspection ports

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

H7/h6 for bore diameters, flatness ≤ 0.05 mm across sealing surfaces

Test Method

Helium leak testing (≤ 1×10^-9 mbar·L/s), pressure decay test, coordinate measuring machine (CMM) verification

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 Stator Housing

Manufacturer profiles associated with Stator Housing.

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Frequently Asked Questions

What is the primary function of a stator housing in roughing pumps?

It provides structural support, maintains stator-rotor alignment, contains the vacuum chamber, and manages thermal dissipation during pump operation.

How does material selection impact stator housing performance?

Materials affect corrosion resistance, thermal conductivity, weight, and outgassing rates; stainless steel offers corrosion resistance for aggressive media, while aluminum improves heat dissipation.

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.

Stator Housing