Abstract: the types of open channel
flow meter and interpret information produced by excellent flow meter, flow meter manufacturer to offer you the quotation.
Types of open channel flow meter and explain one: overview of the full pipe flow in open channel flow state of water called (
开放channeI)
, water flow in open channel flow measurement instrument called open channel flow meter.
Open channel flow profile in addition to the circular, and U, trapezoidal, rectangle, etc.
More flow meter manufacturers choose model price quote you are welcome to inquire, below is the open channel flow meter type and explain the article details.
Types of open channel flow meter and explain one: overview of the full pipe flow in open channel flow state of water called (
开放channeI)
, water flow in open channel flow measurement instrument called open channel flow meter.
In addition to the circular, open channel flow profile and U, trapezoidal and rectangular shapes.
Water according to its shape classification, each form as shown in figure.
1.
ISO is usually called pipe full closed pipes, flow in the pump pressure tank or high potential energy flow under the action of force.
Open channel flow is slope formed by water itself free surface flow.
Open channel flow meter application places with city water diversion channels, coal-fired power plant cooling water diversion and drainage, sewage disposal into the emissions and drainage, industrial and mining enterprises wastewater discharge and water conservancy and agricultural irrigation channels.
This article focuses on the front of several industrial and public utility for flow measurement and instrumentation, does not include the water conservancy and agricultural irrigation with larger flow measurement method.
Abroad, by some estimates, 1995 global industrial and public utility with the open channel flow meter sales Numbers accounted for about 1 of the flow meter as a whole.
6%, about 3.
50000;
If you include a summary of weir and other users can make not to the market purchase instrument, with much more practical.
Domestic applications, there is no estimate.
2: type of industry and public utilities open channel flow meter according to the measurement principle of commonly used in general can be divided into weir, flume, the velocity -
Water calculation method and the method of electromagnetic flowmeter.
1)
Weir (
堰)
Method in the appropriate location to a baffle flow in open channel, the flow is blocked, water level rises to upper damper weir (
Lack of)
Mouth, then flowed from weir crest.
The flow of water just flows out less than those in the channel of the original flow, water level continues to rise, flow increases, until the outflow is equal to the channel flow, water level was stable at a certain height, liquid level measure can calculate the flow.
2)
Flume (
The flume, slot)
Method to reduce the channel is a channel section into throat department, because the area is narrow throat and velocity increases, the upstream water level was raised, to increase the velocity of the kinetic energy (
The increase of kinetic energy by heading up potential energy conversion)
, measuring heading up to calculate the flow.
3)
Velocity -
The calculation method of water level (
Referred to as 'flow velocity -
Water level method)
To measure a local circulation channels (
Points, lines or small size)
Velocity, represents the average flow velocity, then measure flow area, water level obtained by local velocity and average velocity, the coefficient between the calculus to calculate the flow.
4)
Electromagnetic flowmeter method is divided into submersible electromagnetic flowmeter and the full tube electromagnetic flowmeter, which is the current domestic has not yet been developed.
Submersible electromagnetic flowmeter is a flap closure set in the channel, baffle near the bottom of the hole and diving electromagnetic flow sensor, the water flow by flow sensor to measure the flow.
A full package of electromagnetic flowmeter sensor directly on the pipe fitted with diameter circular culvert, the principle of measuring the velocity and the traditional electromagnetic flowmeter is the same, but also has the function of measuring instrument internal water, electrode, magnetic circuit and measurement circuit has bigger difference.
Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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