Storage device

The patent divides the refrigerator into multiple storage compartments (refrigerating compartment, freezing compartment, vegetable compartment) and installs space potential generators in specific compartments rather than covering the entire refrigerator. This segmentation allows the electric field to be generated locally where needed, reducing the number of electrodes and simplifying installation while maintaining effective food preservation in each compartment.

The patent transitions from using shelf-board electrodes that occupy horizontal storage space to space potential generators that generate electric fields vertically and radially. The space potential generator creates an electric field that extends throughout the compartment space without occupying significant storage volume, thus maintaining bacteria growth suppression while preserving storage capacity.

The patent implements local quality by installing space potential generators in specific compartments (refrigerating and freezing compartments) rather than uniformly across the entire refrigerator. Each generator creates a localized electric field appropriate for its compartment's needs, reducing total energy consumption compared to applying high voltage across the entire refrigerator space with large electrode shelf boards.

The patent employs the self-service principle by using the refrigerator's existing metal housing as the grounding electrode. The space potential generator utilizes the refrigerator body itself as the reference potential, eliminating the need for a separate grounding electrode. This approach maintains electric shock protection while avoiding additional structural complexity.