Fan Wheel Metal Insert for Heat Dissipation

The patent applies local quality by creating through-openings in specific locations of the metal insert, allowing plastic material to pass through and form radially extending projections that contact the insert at discrete points. This localized modification enables the plastic to provide structural support and complex blade geometries while maintaining thermal pathways through the metal insert regions where through-openings are not present.

The patent employs composite materials by combining metal insert with plastic blade carrier ring in a hybrid structure. The metal insert provides thermal conductivity for heat dissipation, while the plastic blade carrier ring enables complex blade geometries and injection molding manufacturing. The two materials work together to resolve the contradiction between manufacturability and heat dissipation.

The patent applies preliminary action by pre-forming the metal insert with through-openings before the injection molding process. This pre-prepared structure ensures that the plastic material will pass through these openings and create mechanical interlocking features (radially extending projections) that enhance adhesion. The preliminary design of the insert geometry anticipates and prevents adhesion failure under temperature changes.

The patent uses parameter changes by modifying the physical state and geometry of the plastic material during injection molding. The plastic is injected in a molten state, passes through the through-openings in the metal insert, and then cools to form solid radially extending projections that mechanically interlock with the insert. This parameter change from liquid to solid state creates strong mechanical bonding that maintains adhesion stability under temperature variations.