What is the development trend of flow meters in flow calculation design?

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1. How to calculate the design flow rate of the grille

① Determine the water depth in front of the grille according to the optimal hydraulic cross-section formula (1-1), so the width of the grille groove is about 0.283m. The water depth in front of the grille is h ≈ 0.142m. Explanation: Due to the small water volume, the calculated data is relatively small. In order to meet the needs of design, facilitate construction, and ensure accurate equipment selection, the width of the grid groove is 0.60m and the water depth in front of the grid is 0.30m. ② Grid calculation (1-2) n-grid clearance number is substituted into the data to obtain:=36 (bars) effective width of the grid groove (B). The design uses ø 10 round steel as the grid bar, with S=0.01m,=0.494m, and grid width B=0.8m. General regulations for grille design

1. Grid gap (1) The gap between the grille bars in front of the water pump should be determined according to the requirements of the water pump. (2) The gap between the front grid bars of the wastewater treatment system should meet the following requirements: a maximum gap of 40mm, with manual removal of 25-40mm and mechanical removal of 16-25mm. The wastewater treatment plant can also set up coarse and fine grids, with a gap of 50-100mm between the coarse grid bars. (3) Large wastewater treatment plants can set up coarse, medium, and fine grids. (4) If the gap between the front grille of the pump is not greater than 25mm, a grille can no longer be installed in front of the wastewater treatment system.

2、 The amount of slag in the grid (1) is related to various factors. In the absence of local operating data, the following information can be used. Grid gap of 16-25mm; 0.10~0.05m3/103m3 (g

3、 Other parameters (1) The flow velocity through the grid is generally 0.6~1.0m/s. (2) The water flow velocity in the channel in front of the grille is generally 0.4~0.9m/s. (3) The inclination angle of the grille is generally between 45 ° and 75 °. Small angles are more labor-saving, but they require a larger footprint. (4) The power unit of the mechanical grille is generally recommended to be installed in the Hexun room or other protective measures should be taken for the equipment. (5) Buildings with grid devices must consider having good ventilation facilities. (6) Large and medium-sized grating rooms should be equipped with lifting and dismantling equipment to facilitate equipment maintenance and daily removal of grating debris.

2. Calculation formula for design flow rate of water pump

Q=P η/2.73H. The formula for calculating the design flow rate of a water pump is Q=P η/2.73H, where Q is the flow rate in m3/h, P is the shaft power in KW, η is the efficiency of the pump in%, 2.73 is the leakage virtual start constant, and H is the head in m. Secondly, the flow rate is inversely proportional to the head, that is, the flow rate is large when the lift is low. Accurate calculation requires a flow meter. Roughly estimate how many cubic meters flow per hour, and calculate the diameter and length of the pipeline.

3. How to calculate the design flow of

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