Experimental Study On New Dynamic Throttling Folw Of Centralthrough Holes

Because of the low energy efficiency and tremendous energy saving potential of our country, flow measurement plays an impartment part in the research of energy conservation, which promotes the research of new measuring methods and new measuring instruments. At present, with multiple reasons, water treatment of our heating system is very weak with the result of bad water quality, which can easily lead to the blocking of flowmeter in household-type calorimeter used in individual metered heating system. In allusion to the existing problem of flowmeter in our heating system, this paper suggests to design some new kind of flow measuring device to satisfy the flow testing requirements of household-type calorimeter used in individual metered heating system, which is not easy to be blocked, simply structured ,moderately priced, and so will be suitable for the measurement in small diameter.Based on the analysis of differential pressure flowmeter's principle, this paper compares the characteristic of different flowmeters made according to the throttling principle and comes up with the technology solution of the new flowmeter. In the new solution, dynamic throttling component with a central through-hole is adopted, which is innovative and hasn't been seen before in flow measurement.According to the proposed overall designing plan,this paper introduced the working process and measurement principle of the instrument, and also theoretically analyzed the measuring principle. Based on this, the paper focuses on the core components, that is the dynamic throttling component -venturi tube of design calculation, and introduced important components and their functions principle, such as the elastic sealing ring belt, force conversion institutions, balance room etc. By using solidworks software, the paper conducted three-dimensional modeling of new flowmeter and analysis the velocity field in venture tube.Through the comparative analysis of common flow calibration methods, static volumetric method is adopted in the design of the new flow calibration device .The working process is described and new idea of binary quantitative water tank is put forward. Also it gave principle analysis and design calculation to the main parts like upper and lower spill box of the device and testing section.After the completion of a prototype flowmeter, calibration experiments of the new flowmeter are conducted using new calibration devices. According to the experimental data, it analyzed the relation between different flow values and system pressure head loss also the strain value of flowmeter output. Meanwhile, the measurement accuracy of the new flowmeter is obtained using the error analysis principle. The design of the new system basically meets the original intention. This paper demonstrates the feasibility of dynamic throttling components flowmeter with experience accumulated. But some prombles are found in the process of experiments and data analysis, and this paper gives some suggestions to the improvements of the flowmeter and calibration device against these promebles.