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Target type flow meter and the toilet-water flow rate measurement

Selected three feature points, measuring the signal measurement and analysis system automatically balanced bridge, strain gauge bridge box with semi-bridge method, dynamic resistance of the strain through the strain gauge acquisition. Sampling frequency is lOOI-lz, sampling method for the continuous sampling. Figure 3 Toilet-water flow measurement signal measurement and analysis system dynamic strain gauge dashed DH5935 Toilet Toilet Flow Measurement System Figure 4 Strain target type flow meter is measured strain values, according to equation (3) Calculate the speed value. Velocity method for target type, often used to hang heavy engineering method calibration, but the method is dry calibration, accuracy is not high,[link widoczny dla zalogowanych], we use the actual calibration of the fluid medium, that is given in the experimental tank a steady state at different speeds water, followed by target-type strain measuring the flow velocity under the strain. Table 1 shows the calibration experiments, the flow rate and the corresponding strain measurement. Velocity v (m / s) 0.290.531. o01.40 strain ? 64.81 × 10-6112.76 × 10-6220.45 × 10-6503.43 × 10-6 ・ 10 ・ based on the data in Table 1 and the initial conditions: = 0m / s, e = 0, software Matlab,[link widoczny dla zalogowanych], the numerical fitting polynomial: e = Kv, to solve the undetermined coefficients K = 252.52. Obtained after fitting the speed of a strain is the e = 252.52v. The strain measured by the experimental data and the calibration of the relationship between the speed of a strain can be obtained experimentally measured speed curve, as shown in Figure 5 measured 3.2 6L flush for the next three sets of experiments measured the speed curve Fig. It can be seen from Figure 5, three sets of data in the fast flow rate are less than 0.5s to 1.7m / s, with the potential energy of water in the tank reduces the flow rate decreases, 4s the tank after the water will end, be seen that the strain target type flow meter good reproducibility. Tong Luo 121.81.61.4JI a rustic piece of plastic 【Jl ... din din l llI female executive IY \Figure 5 speed curve obtained from the experiment simulation and experimental results 3.3 Comparison Figure 6 shows the experimental measurements and numerical wall-water were obtained by flushing a point in time during the course of the speed of a comparison chart. from Figure It can be seen in the time history of the two 4s around time in the 0.5s flow has reached 1.7m / s, to 2.0s time, the flow rate slowly decreased to 1.4m / s; in 2.0s ~ 3.0s period, the wall-water flow are affected by the water seal water flow rate fluctuations; 3.0s later, with the lower water level in the tank, the flow rate decreases; in 4s moment, all of the basic flow through the test points . the flushing process, both in time course, speed,[link widoczny dla zalogowanych], size and speed of the basic agreement on the trend, therefore, to some extent test results verify the accuracy of the numerical simulation. Tuo a Nuo!. l, according to an experimental induced I ●, fylI simulation deposited according to IjV limit.,. J'I] '\} 1lfl 『' VAUfIVIJ.ri | 1yIlII/Vl 'll100.511.522.533.544.5 time (s) Figure 6 Experimental and simulation velocity curves of 4 Conclusions 1) Based on the flow rate target flowmeter measurement device has advantages of good dynamic response can be used for measuring unsteady flow velocity; 2) in the target pole attached sleeve, can effectively control the force area target to eliminate the measured depth on the measurement accuracy and improve the accuracy of velocity measurement; 3) flow meter with new design successfully carried out during the flush toilet-water velocity measurements. measurements show that the flow rate of the target type strain meter has good repeatability, numerical simulation results are in good agreement with the measured curve can be. References [1] Suyan Xun, Sheng key,[link widoczny dla zalogowanych], Liang Guowei. flow measurement and testing. Beijing: China Metrology Publishing House. 1992,160 ~ 165 [2 ] Jiang Qing, YANG Na. Strain Target Flowmeter Error analysis and countermeasures. Automation Instrumentation,[link widoczny dla zalogowanych], 2002 (3): 10 ~ 13 precession-based vortex mass flow meter working principle and application of Yu Xiaodong (Institute of Metrology and Quality Inspection of Shenzhen City, Shenzhen 518055, China) Abstract The precession-type vortex flow meter operating principle of the analysis, reveals the theory such as the mass flow meter use is feasible. text listed in the implementation of the program, showing the precession-based vortex flowmeter in terms of quality broad aspects of flow measurement applications. Key words mass flow; measurement; type vortex precession flowmeter 28642l8642 ● 2 ¨, ¨ 0

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