The key points of the selection of the insertion type flowmeter, the insertion type flowmeter occupies the key influence in the measurement of the large quantity of water output, the price of the insertion type flowmeter is only one to one tenth of the flowmeter of the full tube, in addition, very light, pressure loss is small, easy to install and overhaul, is a big advantage of the insertion type flowmeter.So in places where the accuracy is too low, the plug-in becomes a hot option.In large-size pipeline flowmeters, because the water flow is wide and low, fine sand and stains are easy to accumulate on the surface of the instrument panel. Therefore, the plug-in flowmeters are often equipped with valves to remove the instrument panel for maintenance and inspection under the condition of continuous flow, so as to improve the credibility of the detection system.
Construction of plug-in flowmeter.The insertion meter has a tachometer type and a runoff tachometer type.The plug - in vortex street, pressurization, electromagnetic flowmeters belong to the point tachometer type.Differential pressure equal-velocity tube flowmeter, thermal equal-velocity tube flowmeter, etc.Although the principle of the plug-in flowmeter is various, its construction has its own merits.Point tachometer flowmeter consists of five parts: measuring head, inserting rod, inserting tissue, converter and instrument panel body.Differential pressure equal-velocity tube flowmeter includes test parts (equal-velocity tube), valve, insert tissue and pressure equipment and other components.
1. Comparison of several types of plug-in flowmeters
(1) plug-in turbine flowmeter.Lower price, suitable for measuring the total flow of cleaning liquid.When the fluid mechanics contains solid particles or thick matter, it is very easy to cause supercharging stagnation.The dirty things like plant fiber and tetrafluororite tape introduced in fluid mechanics are very easy to be wound around turbine blades, resulting in the change of total flow index. However, it is not practical to refit filter devices that meet the requirements on large size pipelines, thus jeopardized the adoption of plug-in turbine flowmeters.
(2) differential pressure type uniform velocity tube flowmeter.This kind of flowmeter is often used in the measurement of large quantity of water.The key reason is simple structure, low price, convenient maintenance.Because of the type of runoff meter, if the length of the rod inserted into the instrument panel is consistent with the tube, the value of the instrument panel is less harmful to the spread of water flow outside the tube.During the installation of the equal-velocity tube, it is necessary to pay attention to the fact that there can be no vapor in the pressure tube.
(3) plug-in vortex flowmeter.Plug-in vortex street flowmeter itself plus or minus 1% accuracy, easy to dirty performance is better than insert type turbine flowmeter, by flow of strength of small sand is not easy to like velocity-equalizing tube to be very easy to cause common failures, but by its measuring principle, used to measure water yield, can measure water flow low limit of only 0.3 m/s, therefore, in the measurement of the other half of low water flow when the lower limit of regulations, can not.
(4) plug-in electromagnetic flowmeter.Compared with other plug-in flowmeters, the plug-in electromagnetic flowmeter has significant advantages in measuring the water output of large pipelines.The category is very large;The measuring head has higher precision;The hazard of blockage can be ignored;There are immersion products that can be installed in the dashboard well and flooded without compromising all normal measurements.
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