INDUSTRY COMPONENT

Helical wire core

A helical wire core is a flexible structural component made of coiled wire that provides shape retention and support in flexible ducts, maintaining airflow while allowing bending.

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Component Specifications

Definition
The helical wire core is a critical structural element in flexible duct systems, consisting of a continuous steel wire formed into a precise helical coil. This component provides radial strength to prevent duct collapse under negative pressure while maintaining flexibility for installation around obstacles. The wire's pitch, diameter, and material properties determine the duct's minimum bend radius, pressure rating, and durability. In HVAC applications, it ensures consistent airflow by maintaining cross-sectional area during bending and compression.
Working Principle
The helical wire core operates on the principle of spring mechanics, where the coiled structure provides both flexibility and elastic recovery. When the duct bends, the wire coils compress on the inner radius and expand on the outer radius, maintaining structural integrity through distributed stress. The helical shape creates continuous support around the duct circumference, preventing local buckling while allowing axial compression and extension during installation.
Materials
Galvanized steel wire (ASTM A641 Class 1), 1.2-2.0mm diameter, tensile strength 350-550 MPa. Alternative materials include stainless steel (AISI 304) for corrosive environments or aluminum for lightweight applications.
Technical Parameters
  • Coil Pitch 12mm
  • Wire Diameter 1.5mm
  • Pressure Rating ±2500 Pa
  • Temperature Range -40°C to 120°C
  • Minimum Bend Radius 100mm
Standards
ISO 7231, DIN 24194, SMACNA HVAC Duct Construction Standards

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Helical wire core.

helical wire core flexible duct support HVAC duct components wire reinforcement duct structural integrity ventilation systems Helical wire core in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Flexible Duct

A flexible, bendable duct used in HVAC systems to connect rigid ductwork sections and navigate around obstacles.

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Engineering Analysis

Risks & Mitigation
  • Wire fatigue from cyclic bending
  • Corrosion in humid environments
  • Improper installation causing kinking
  • Electrical conductivity requiring grounding in some applications
FMEA Triads
Trigger: Material fatigue from vibration
Failure: Wire fracture leading to duct collapse
Mitigation: Regular inspection, vibration dampening mounts, proper duct support spacing
Trigger: Chemical corrosion
Failure: Reduced structural integrity and potential particulate contamination
Mitigation: Material selection based on environment, protective coatings, regular cleaning
Trigger: Over-bending during installation
Failure: Permanent deformation restricting airflow
Mitigation: Training on minimum bend radius, use of installation guides, proper duct routing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Wire diameter ±0.1mm, coil pitch ±1mm, concentricity within 2mm
Test Method
ASTM E8 tensile testing, cyclic bend testing per ISO 7231, pressure decay testing

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What determines the minimum bend radius of a helical wire core?

The minimum bend radius is determined by wire diameter, coil pitch, and material elasticity. Thicker wires with tighter pitches allow smaller bend radii without permanent deformation.

Can helical wire cores be repaired if damaged?

Localized damage can sometimes be repaired with specialized wire splicing, but extensive damage typically requires complete duct replacement to maintain pressure integrity.

How does wire coating affect performance?

Galvanization provides corrosion resistance for standard applications, while polymer coatings reduce friction and noise. Stainless steel offers superior corrosion resistance for harsh environments.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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