According to what you said, you should apply for a patent for utility model. If we defend our rights, we should compare the product structure recorded in the claim with the product structure suspected of infringement. Then judge whether they are technically the same or equivalent. Instead of comparing by judging the process flow, because the claim of the utility model does not protect the process flow.
Patent infringement is a fairly patented work, which needs long-term accumulation and research, otherwise the determination of infringement is not as simple as imagined. I suggest you contact your local intellectual property lawyer for consultation.
Patent Law Article 2 Invention-creation as mentioned in this Law refers to inventions, utility models and designs.
Invention refers to a new technical scheme proposed for a product, method or its improvement.
Utility model refers to a new practical technical scheme for the shape, structure or combination of products.
Appearance design refers to a new design with aesthetic feeling and suitable for industrial application based on the shape, pattern or combination of products and the combination of colors, shapes and patterns.