Grooved Bellows Elastic Member for Uniform Pump Compression

The patent replaces expensive metal springs with a disposable plastic elastic member that can be molded using injection molding or similar processes. The plastic member is designed to be used once and then discarded with the pump assembly, eliminating the need for expensive metal materials and complex recycling processes while maintaining sufficient elastic force for the application.

The patent changes the material parameter from metal to plastic and modifies the structural parameters by creating protrusion and recessed portions with guiding grooves. These parameter changes allow the elastic member to be manufactured at lower cost while achieving the required elastic force through optimized geometric design rather than relying solely on material properties.

The patent applies local quality by creating guiding grooves in specific locations on the protrusion and recessed portions. These grooves are strategically positioned to guide the deformation path and ensure uniform compression across all screw threads, preventing the irregular deformation that occurs in conventional bellows members without such localized structural features.

The guiding grooves are pre-formed during the molding process to predetermined positions and shapes. This preliminary action ensures that during subsequent compression operations, the deformation follows the predetermined path established by the grooves, preventing irregular deformation before it can occur and ensuring consistent compression behavior.