US 12,405,145 B1
Micro flow measuring device and method based on mass method
Fan Luo, Chengdu (CN); Rong Gan, Chengdu (CN); Jie Zhou, Chengdu (CN); Li Lei, Chengdu (CN); and Shihui Cheng, Chengdu (CN)
Assigned to National Institute of Measurement and Testing Technology, Chengdu (CN); and Division of Flow Metrology, National Institute of Measurement and Testing Technology, Chengdu (CN)
Filed by National Institute of Measurement and Testing Technology, Chengdu (CN); and Division of Flow Metrology, National Institute of Measurement and Testing Technology, Chengdu (CN)
Filed on Jan. 6, 2025, as Appl. No. 19/010,684.
Application 19/010,684 is a continuation of application No. PCT/CN2024/101088, filed on Jun. 24, 2024.
Claims priority of application No. 202410608739.4 (CN), filed on May 16, 2024.
Int. Cl. G01F 1/78 (2006.01); G01F 15/00 (2006.01); G01F 15/18 (2006.01)
CPC G01F 1/78 (2013.01) [G01F 15/006 (2013.01); G01F 15/185 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A micro flow measuring device based on a mass method, comprising:
an inner anti-evaporation cover;
an outer anti-evaporation assembly, wherein the outer anti-evaporation assembly covers the inner anti-evaporation cover;
a weighing balance, disposed in the inner anti-evaporation cover;
a liquid collecting container, disposed in the inner anti-evaporation cover and placed on the weighing balance;
a packing assembly, disposed in the liquid collecting container, wherein the packing assembly is made of a material with low water absorption and is gas-permeable, and an accommodating cavity configured to accommodate to-be-measured liquid is formed between a lower end of the packing assembly and a bottom portion of the liquid collecting container;
a capillary receiving tube, wherein the capillary receiving tube is disposed in an L shape, an upper end and a lower end of the capillary receiving tube are provided with a liquid receiving opening and a liquid discharging opening respectively, the lower end of the capillary receiving tube passes through the packing assembly vertically and extends into the accommodating cavity, and the upper end of the capillary receiving tube passes through the inner anti-evaporation cover and is bent to be horizontal; and
a liquid outlet tube, wherein the liquid outlet tube comprises a horizontal liquid outlet section, an end portion of the horizontal liquid outlet section is provided with a liquid outlet, the liquid outlet of the liquid outlet tube is horizontally aligned with and maintains a first distance with the liquid receiving opening after passing through the outer anti-evaporation assembly, to enable liquid discharged by the liquid outlet to be sucked into the liquid receiving opening at intervals, and the liquid discharging opening drips the liquid into the liquid collecting container at intervals; and
the first distance is less than an outer diameter of the liquid outlet and is greater than a maximum distance required for forming a continuous liquid column between the liquid outlet and the liquid receiving opening.