『Pump flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Pump flow calculation formula
The calculation of pump flow is generally based on the pump flow calculation formula: Q=P η/2.73H, where Q is the flow rate, measured in m3/h, P is the shaft power, measured in KW, η is the efficiency of the pump, measured in%, 2.73 is a constant, and H is the head, measured in m. Secondly, the flow rate is inversely proportional to the head, that is, if the head is low, the flow rate is high, and an accurate calculation requires a flow meter. Roughly estimate how many cubic meters flow per hour, and calculate the diameter and length of the pipeline. The shaft power of the water pump (kw) P=water delivery rate (liters/second) x head (meters)/102 x efficiency=flow rate x head x density x gravitational acceleration. 102 is the unit sorting constant. The efficiency of a pump=effective power of the water pump ÷ shaft power of the water pump (usually 50% -90%, higher for large pumps). The working principle of a centrifugal pump is that before starting the water pump, the pump and inlet pipe are filled with water. After the water pump runs, under the centrifugal force generated by the high-speed rotation of the impeller, the water in the impeller channel is thrown around and pressed into the volute, forming a vacuum at the impeller inlet. The water in the pool is sucked into the suction pipe under external atmospheric pressure to supplement this space. The water then sucked in is thrown out by the impeller through the volute and enters the outlet pipe. From this, it can be seen that if the impeller of the centrifugal pump continues to rotate, it can continuously absorb and pressurize water, and water can be continuously lifted from low to high or far. In summary, centrifugal pumps ar
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(2) Due to the vacuum suction formed by the impeller inlet of the centrifugal pump, it is necessary to inject water into the pump and suction pipe before starting, or use a vacuum pump to extract air to form a vacuum. The pump casing and suction pipe must be tightly sealed to prevent air leakage, otherwise a vacuum cannot be formed and water cannot be sucked in.
.(3) Due to the inability of the impeller inlet to form an absolute vacuum, the suction height of the centrifugal pump cannot exceed 10 meters. In addition, the loss along the suction pipeline caused by water flow, the actual allowable installation height (the height of the pump axis from the suction water surface) is much less than 10 meters. If installed too high, it will not absorb water; In addition, due to the lower atmospheric pressure in mountainous areas compared to plains, the installation height of the same water pump in mountainous areas, especially in high mountain areas, should be lowered, otherwise it cannot suction water. K - coefficient of variation (usually 1.5-2.5); Q - Water standard (generally 300 liters per person per day in South China; 400 liters per person per day in high-end residential areas); T - Water usage time (usually 12 hours/day); M - The number of people using water is relatively low (usually calculated as 4-5 peopl
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