Culvert type flow meter
A flow meter and culvert technology, applied in the field of culvert flow meters, can solve problems such as inaccurate measurement results and achieve the effect of improving accuracy
Inactive Publication Date: 2005-06-08
上海华辰科技发展有限公司
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Problems solved by technology
[0003] The purpose of the present invention is to provide a culvert flowmeter for the shortcomings of the above-mentioned traditional flowmeter, which will not cause the change of the water level in the channel due to the change of the downstream water level, resulting in the disadvantage of inaccurate measurement results
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[0028] see Figure 5-Figure 8 As shown, the culvert flowmeter of the present invention includes the following main components:
[0029] The diversion groove 21, the diversion groove 21 is laid along the side and the bottom of the channel, the diversion groove 21 includes a front coupling section 211, a diversion section 212, and a rear coupling section 213 in the direction of water flow, and the diversion section 212 is an inverted trapezoid. The coupling sections 211 , 213 are higher than the diversion section 212 . The diversion groove 21 is located in the channel, and its height can be higher than the top of the channel, and can also be equal to or lower than the top of the channel.
[0030] Weir plate 22, the weir plate 22 is arranged along the cross-sectional direction of the water flow, and is located above the diversion section 212 of the diversion groove. There is a culvert 221 on the weir plate 22, and the shape of the culvert 221 can be circular, rectangular or othe...
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The invention discloses a culvert-type flowmeter, which comprises a diversion groove, a weir plate, and a liquid level difference transmitter. The diversion groove is laid along the side and bottom of a channel, and the diversion groove includes a front connecting section and a diversion section in the direction of water flow. , the rear connection section, the diversion section is an inverted trapezoid, and the front and rear connection sections are higher than the diversion section; the weir plate is arranged along the cross-sectional direction of the water flow, above the diversion section of the diversion groove, and a culvert is opened on the weir plate; The level difference transmitter is connected with two pressure guide pipes, one of which is located on the upstream side of the weir plate, and the other is located on the downstream side of the weir plate, and the liquid level transmitter outputs the weir plate Differential pressure signal on both sides. When the flowmeter is used for measurement, there will be no definite functional relationship due to factors such as unblocked downstream of the weir plate, rising water level downstream of the weir plate, or water accumulation in the channel, thereby greatly improving the accuracy of the measurement results.
Description
technical field [0001] The invention relates to a device for measuring medium flow in a channel, in particular to a culvert flowmeter. Background technique [0002] In the measurement of the medium in the channel, the channel flow meter is usually composed of Parshall flume or weir plate and liquid level sensor. When using a Parshall trough for measurement, a section of the channel is made into a special shape called a Parshall trough. For the shape of the Parshall trough, please refer to figure 1 , figure 2 Shown, among the figure 11 is the bottom of the channel, and 12 is the Parshall groove. If the downstream channel is unblocked, the flow rate flowing through the channel has a definite functional relationship with the upstream liquid level, as long as the liquid level of the Parshall tank is measured, the flow rate can be calculated. The weir plate flowmeter is to set a weir plate with a rectangular or triangular weir opening in the channel, see image 3 , Figure ...
Claims
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IPC IPC(8): G01F1/34
Inventor 徐根发徐孟飚冯增福徐荣发陆国平
Owner 上海华辰科技发展有限公司