Flow Path Switching Valve Burr Containment Joint Structure

The patent converts the harmful burrs generated by welding into a beneficial containment system. By designing burr containment spaces with groove structures on both the inner and outer sides of the joint portion, the burrs are redirected to follow the groove paths, preventing them from entering the valve case or protruding outward. This transforms the welding defect into a controlled feature that maintains both joint strength and cleanliness.

The patent addresses appearance quality by designing outer side burr containment grooves that capture and contain burrs before they can protrude outward. The groove structure guides burrs along a controlled path, preventing them from affecting the external appearance while maintaining the welding connection's reliability.

The patent prevents burr intrusion by designing inner side burr containment grooves that capture burrs at the joint portion. These grooves create a physical barrier that redirects burrs away from the valve case interior, maintaining structural integrity while eliminating the harmful effect of burr intrusion.

The patent incorporates burr containment grooves into the mold design during the injection molding process. This preliminary action creates the burr containment structure before welding occurs, allowing the welding process to proceed without requiring subsequent burr removal operations. The grooves are pre-formed as integral features of the valve case and gear case, simplifying the overall manufacturing process.