Shandong Haihua has obtained a patent for an online continuous sampling and testing device for fluids in vertical pressure-free gravity-fed pipelines

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According to information from the Intellectual Property Office as of August 5, 2025, **Shandong Haihua Group Co., Ltd. has been granted a patent titled “An Online Continuous Sampling and Detection Device for Fluids in Vertical Pressure-Free Self-Flowing Pipelines.” The approval notice number is CN223192951U, with the application date being September 2024. The patent abstract indicates that this utility model relates to the field of fluid sampling and testing, and specifically to an on-line continuous sampling and testing device for fluids in vertical, pressure-free gravity-fed pipelines. It includes a sampling tank, a liquid guide tube, a sampling valve, an exhaust tube, a air float chamber, a flow cell, a liquid discharge tube, a sensor, and a display panel, which are connected in sequence. The sampling groove is a semi-circular flow channel with an open top, extending upward to the middle of the pipe; its surface faces the direction of the flowing fluid, thereby ensuring continuous and stable fluid sampling ； The ratio of the diameter of the floating cylinder tube to the diameter of the said liquid guide tube is 1.5‑2.5:1 ； The flow velocity of the fluid inside the air pocket is low; the bubbles in the fluid gather and grow larger, gradually separating from the liquid. The separated bubbles are then expelled through the exhaust pipe ； This practical new design enables precise and continuous sampling in complex and unstable fluid conditions, while effectively eliminating the interference caused by bubbles in the sample on the measurement results. According to Tianyancha data, Shandong Haihua Group Co., Ltd., established in 1996 and located in Weifang City, is an enterprise primarily engaged in the manufacturing of chemical raw materials and chemical products. The registered capital of the enterprise is 724,494.80362 thousand RMB. According to the big data analysis conducted by Tianyancha, Shandong Haihua Group Co., Ltd. has made investments in 29 companies in total, participated in 5,000 bidding projects. In terms of property-related information, it holds 7 trademark records and 354 patent records; additionally, the company possesses 76 administrative licenses.