System for Measuring the Flow Rate of an Intelligent Measurement and Control Gate In-situ Using a Channel and Comparative Measurement Method Thereof

Abstract

The present invention discloses a system for in-situ measuring the flow rate of an intelligent control gate using a channel and a ratio measurement method thereof. By using the downstream channel of the intelligent control gate, three sluice weirs, namely an upper weir, a middle weir and a lower weir, are built to divide the channel into an upper pool, a middle pool and a lower pool. A reflux pump equipped with a flow meter is installed in the upper pool. The volume of the middle pool is much larger than that of the lower pool. A container with a known volume is used to fill and calibrate the relationship between the volume and water level of the lower pool, and then the relationship between the volume and water level of the middle pool is calibrated with the lower pool. When the intelligent control gate is opened for flow-through, the middle pool is alternately filled with water and the reflux pump operates. The total flow rate during the water filling period is measured by the middle pool, the flow rate during the water filling period is calculated by the volume method, and the flow rate during the reflux period is recorded by the flow meter. Then, it is compared with the measured value of the intelligent control gate itself to calibrate and verify the measurement accuracy of its flow rate. The present invention utilizes the existing channel, arranges the sluice weirs in a cascade manner, which is simple and easy to implement. There is no need to excavate a water storage pit for measurement. Under the condition of continuous flow, the volume method and the flow meter method are combined to compare and measure the metering accuracy of the intelligent control gate, which is suitable for the in-situ calibration and verification of the in-service intelligent control gate in a multi-sediment river.

Description

Technical Field

[0001] The present invention relates to hydraulic measurement technology, in particular to a method for in-situ measuring the flow rate of an intelligent control gate in a channel by using the channel, and is particularly applicable to in-situ calibration and measurement of an intelligent control gate channel in-situ. Background Art

[0002] The informatization of irrigation areas marked by the transformation of intelligent control gates has been booming in China. At present, the common methods for measuring the flow rate of intelligent control gates for in-situ calibration in channels are volume method for water measurement, weir method for water measurement, and flow meter method for water measurement. Among them, the volume method has the highest accuracy, but it is difficult to implement because it requires excavating a large-volume water measurement pool or configuring a large number of pumping tank trucks.

[0003] For example, more than two thousand intelligent control gates have been installed in the Ningxia Irrigation Area. Because there is no convenient and accurate in-situ calibration method, the reliability of the measurement and control of the gates is difficult to determine, which has restricted its popularization and high-level application. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for in-situ measuring the flow rate of an intelligent control gate in a channel, which uses the self-capacity of the channel section, and compares the water flow rate in-situ by using the volume method and the flow meter method to achieve convenient and accurate calibration of the intelligent control gate.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: a system for in-situ measuring the flow rate of an intelligent control gate in a channel, including the intelligent control gate to be measured and the channel. On the channel behind the intelligent control gate to be measured, an upper weir, a middle weir, and a lower weir equipped with water gauges are arranged in sequence. The channel between the intelligent control gate and the upper weir forms an upper pool, the channel between the upper weir and the middle weir forms a middle pool, and the channel between the middle weir and the lower weir forms a lower pool. A return water pump for returning water to the water area in front of the intelligent control gate is placed in the upper pool, and a flow meter is installed on the pipeline of the return water pump.

[0006] The height of the flow-through bottom plate of the upper weir, the middle weir, and the lower weir from the bottom of the channel is not less than 1 / 10 of the channel depth, and the elevation of the flow-through bottom plate of the lower weir is not higher than the elevation of the flow-through bottom plate of the middle weir.

[0007] The volume of the middle pool is not less than the water flow rate in 10 minutes when the intelligent control gate is fully open, the volume of the lower pool is not greater than 1 / 100 of the volume of the middle pool, and the maximum flow rate of the return water pump is not less than the full-open flow rate of the intelligent control gate (1).

[0008] The upper weir, the middle weir, and the lower weir cannot leak. The cofferdam body is made of cast concrete, the gate is welded by steel sections and steel plates, and polyvinyl chloride films are laid in the channel sections of the upper pool, the middle pool, and the lower pool.

[0009] The flowmeter used is an external clamp type ultrasonic flowmeter for pipelines or an internal pipeline differential pressure flowmeter.

[0010] The specific comparison method for the system of in-situ measurement of intelligent control and measurement gate flow in the channel includes the following steps:

[0011] A. Open the intelligent control and measurement gate to allow water to flow through the upper gate weir, middle gate weir and lower gate weir, then close the intelligent control and measurement gate. After the still water surfaces are formed in the upper pool, middle pool and lower pool, close the upper gate weir, middle gate weir and lower gate weir;

[0012] B. Fill a container with a known volume of water, pour the water into the lower pool, and record the cumulative water filling volume at different water levels until the water level reaches the highest scale of the water gauge. Use the water level scale as the vertical axis and the water filling volume as the horizontal axis to draw the water level-capacity curve of the lower pool;

[0013] C. Open the lower gate weir. After the water level in the lower pool drops to the over-flow bottom plate of the lower gate weir, close the lower gate weir, open the upper gate weir, and open the intelligent control and measurement gate to release water until the middle pool is full of water, then close the upper gate weir and the intelligent control and measurement gate;

[0014] D. Open the middle gate weir to release water until the lower pool is full of water, then close the middle gate weir. At the same time, record the water levels in the lower pool and the middle pool. Open the lower gate weir. After the water level in the lower pool drops to the over-flow bottom plate of the lower gate weir, close the lower gate weir. Repeatedly fill the lower pool with water from the middle pool until the water level in the middle pool drops to the over-flow bottom plate of the middle gate weir. Use the corresponding relationship between the water filling volume of each time in the lower pool and the water level change in the middle pool to draw the water level-storage capacity curve of the middle pool;

[0015] E. Open the upper gate weir and the lower gate weir, close the middle gate weir, open the intelligent control and measurement gate to fill the middle pool with water, close the upper gate weir, record the water filling time and water level value of the middle pool, turn on the reflux pump, pump the water in the upper pool back to the water area in front of the intelligent control and measurement gate, and record the measured value of the flowmeter;

[0016] F. According to the water level value and the water level-capacity curve of the middle pool, find out the water filling volume of the middle pool, divide it by the water filling time to obtain the average flow value during the water filling period of the middle pool, and compare and analyze the value with the measured value of the flowmeter during the reflux period and the self-recorded flow value of the intelligent control and measurement gate in the corresponding time period respectively.

[0017] The intelligent control and measurement gate conducts flow comparison measurements at different opening degrees.

[0018] The beneficial effects of the present invention are as follows: By using the channel section behind the intelligent control and measurement gate, the combined comparison measurement of the volume method and the flowmeter method is realized, which not only saves investment, but also does not interrupt the water flow during the comparison measurement. Moreover, it can be compared and measured separately according to different opening degrees of the intelligent control and measurement gate, and then draw the relationship curve between the gate opening degree and the flow rate, providing a scientific, economic and applicable solution for the flow rate calibration during the operation of the intelligent control and measurement gate. Description of the Drawings

[0019] Figure 1 Schematic diagram of the overall in-situ comparison measurement of the present invention.

[0020] Figure 2 Schematic diagram of the gate weir section of the present invention.

[0021] Figure 3 Calibration curve for measuring the storage capacity of the middle pool using the method of the present invention. Specific embodiments

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] As Figure 1 shown, the system for measuring the flow rate of an intelligent control gate in-situ using a channel of the present invention includes an intelligent control gate 1 to be measured and a channel. On the channel behind the intelligent control gate 1 to be measured, an upper weir 2, a middle weir 3, and a lower weir 4 equipped with water gauges are arranged in sequence. The channel between the intelligent control gate 1 and the upper weir 2 forms an upper pool 5, the channel between the upper weir 2 and the middle weir 3 forms a middle pool 6, and the channel between the middle weir 3 and the lower weir 4 forms a lower pool 7. A return water pump 8 for returning water to the water area in front of the intelligent control gate 1 is placed in the upper pool 5, and a flow meter 9 is installed on the pipeline of the return water pump 8.

[0024] The height of the flow-through bottom plates of the upper weir 2, the middle weir 3, and the lower weir 4 from the bottom of the channel is not less than 1 / 10 of the channel depth, and the elevation of the flow-through bottom plate of the lower weir 4 is not higher than that of the flow-through bottom plate of the middle weir 3.

[0025] The volume of the middle pool 6 is not less than the flow rate passing through in 10 minutes when the intelligent control gate 1 is fully open. The volume of the lower pool 7 is not greater than 1 / 100 of the volume of the middle pool 6, and the maximum flow rate of the return pump 8 is not less than the full-open flow rate of the intelligent control gate 1.

[0026] The upper weir 2, the middle weir 3, and the lower weir 4 cannot leak. The cofferdam body is formed by pouring concrete, the gate is welded by steel sections and steel plates, and polyvinyl chloride films are laid in the channel sections of the upper pool 5, the middle pool 6, and the lower pool 7.

[0027] The flow meter 9 adopts an external clamp-on ultrasonic flow meter for pipelines or an internal differential pressure flow meter for pipelines.

[0028] The comparison measurement method of the above system for measuring the flow rate of an intelligent control gate in-situ using a channel includes the following steps:

[0029] A. Open the intelligent control gate 1, let the water flow through the upper weir 2, the middle weir 3, and the lower weir 4, then close the intelligent control gate 1. After the upper pool 5, the middle pool 6, and the lower pool 7 form a still water surface, close the upper weir 2, the middle weir 3, and the lower weir 4;

[0030] B. Fill a container of known volume with water, then pour the water into the lower pool 7, and record the cumulative water filling volume at different water levels until the water level reaches the highest scale of the water gauge. Use the water level scale as the vertical axis and the water filling volume as the horizontal axis to plot the water level capacity curve of the lower pool 7;

[0031] C. Open the lower sluice weir 4. After the water level in the lower pool 7 drops to the overflow bottom plate of the lower sluice weir 4, close the lower sluice weir 4. Open the upper sluice weir 2 and open the intelligent measurement and control gate 1 to release water until the middle pool 6 is full of water, then close the upper sluice weir 2 and the intelligent measurement and control gate 1;

[0032] D. Open the middle sluice weir 3 to release water until the lower pool 7 is full of water, then close the middle sluice weir 3. At the same time, record the water levels of the lower pool 7 and the middle pool 6. Open the lower sluice weir 4. After the water level in the lower pool 7 drops to the overflow bottom plate of the lower sluice weir 4, close the lower sluice weir 4. Repeatedly fill the lower pool 7 with the water in the middle pool 6 until the water level in the middle pool 6 drops to the overflow bottom plate of the middle sluice weir 3. Use the corresponding relationship between the water filling volumes of each time in the lower pool 7 and the water level change in the middle pool 6 to plot the water level storage capacity curve of the middle pool 6;

[0033] E. Open the upper sluice weir 2 and the lower sluice weir 4, close the middle sluice weir 3, and open the intelligent measurement and control gate 1 to fill the middle pool 6 with water. Close the upper sluice weir 2, record the water filling time and water level value of the middle pool 6, open the reflux pump 8, and pump the water in the upper pool 5 back to the water area in front of the intelligent measurement and control gate 1, and record the measured value of the flow meter 9;

[0034] F. According to the water level value and the water level capacity curve of the middle pool 6, find the water filling volume of the middle pool, divide it by the water filling time, and obtain the average flow rate value during the water filling period of the middle pool 6. Compare and analyze this value with the measured value of the flow meter 9 during the reflux period and the self-recorded flow rate value of the intelligent measurement and control gate 1 in the corresponding time period.

[0035] The intelligent measurement and control gate 1 performs flow ratio measurement at different opening degrees.

[0036] According to the method of the present invention, the intelligent measurement and control gate of the Kongxin Canal of the Fourth Institute of the Hanyan Canal in Ningxia is compared and measured. The upper sluice weir uses the original channel control gate, and the design and construction parameters of the middle sluice weir and the lower sluice weir are as follows in the table.

[0037]

[0038]

[0039] The calibration curve of the storage capacity of the middle pool is as Figure 3 shown.

[0040] The comparison and measurement opening degrees are 100mm, 200mm, 300mm, and 400mm respectively, and the comparison and measurement results are as follows:

[0041]

[0042] The project construction and management unit finally calibrates the parameters of the intelligent measurement and control gate according to the comparison results of the volume method.

[0043] The beneficial effects of the present invention are as follows: A field in-situ comparison method for measuring the flow rate of an intelligent measurement and control gate of the present invention utilizes the channel section behind the intelligent measurement and control gate to realize the combined comparison of the volume method and the flowmeter method. It not only saves investment, but also does not interrupt the water flow during the comparison. It can also conduct separate comparisons according to different opening degrees of the intelligent measurement and control gate, and then draw the relationship curve between the gate opening degree and the flow rate, providing a scientific, economical, and applicable solution for the flow rate calibration during the operation of the intelligent measurement and control gate.

[0044] The above-described embodiments are only used to illustrate the technical ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The patent scope of the present invention cannot be limited only by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A method for comparing measurements of a system for in-situ measuring the flow rate of an intelligent control gate in a channel. The system for in-situ measuring the flow rate of an intelligent control gate in a channel includes the intelligent control gate to be measured (1) and the channel. An upper weir (2) equipped with a water gauge, a middle weir (3), and a lower weir (4) are successively arranged on the channel behind the intelligent control gate to be measured (1). The channel between the intelligent control gate (1) and the upper weir (2) forms an upper pool (5), the channel between the upper weir (2) and the middle weir (3) forms a middle pool (6), and the channel between the middle weir (3) and the lower weir (4) forms a lower pool (7). A return water pump (8) for returning water to the water area in front of the intelligent control gate (1) is placed in the upper pool (5), and a flow meter (9) is installed on the pipeline of the return water pump (8); It is characterized in that, The comparison measurement method includes the following steps: A. Open the intelligent measurement and control gate (1). After the water flows through the upper weir (2), middle weir (3) and lower weir (4), close the intelligent measurement and control gate (1). After the still water surfaces are formed in the upper pool (5), middle pool (6) and lower pool (7), close the upper weir (2), middle weir (3) and lower weir (4); B. Fill a container with a known volume of water and pour the water into the lower pool (7). Record the cumulative water filling amounts at different water levels until the water level reaches the highest scale of the water gauge. Use the water level scale as the vertical axis and the water filling amount as the horizontal axis to draw the water level - capacity curve of the lower pool (7); C. Open the lower weir (4). After the water level in the lower pool (7) drops to the bottom plate of the lower weir (4) for water flow, close the lower weir (4). Open the upper weir (2) and open the intelligent measurement and control gate (1) to release water until the middle pool (6) is full of water, then close the upper weir (2) and the intelligent measurement and control gate (1); D. Open the middle weir (3) to release water until the lower pool (7) is full of water, then close the middle weir (3). At the same time, record the water levels of the lower pool (7) and the middle pool (6). Open the lower weir (4). After the water level in the lower pool (7) drops to the bottom plate of the lower weir (4) for water flow, close the lower weir (4). Repeatedly fill the lower pool (7) with the water from the middle pool (6) until the water level in the middle pool (6) drops to the bottom plate of the middle weir (3). Use the corresponding relationship between the water filling amounts of each time in the lower pool (7) and the water level change in the middle pool (6) to draw the water level - storage capacity curve of the middle pool (6); E. Open the upper weir (2) and the lower weir (4), close the middle weir (3), and open the intelligent measurement and control gate (1) to fill the middle pool (6) with water. Close the upper weir (2). Record the water filling time and water level value of the middle pool (6). Open the reflux pump (8) to pump the water in the upper pool (5) back to the water area in front of the intelligent measurement and control gate (1), and record the measured value of the flowmeter (9); F. According to the water level value and water level - capacity curve of the middle pool (6), find out the water filling amount of the middle pool, divide it by the water filling time to obtain the average flow rate value during the water filling period of the middle pool (6). Compare and analyze the value with the measured value of the flowmeter (9) during the reflux period respectively with the self - recorded flow rate value of the intelligent measurement and control gate (1) in the corresponding time period.

2. The comparison measurement method of the system for in-situ measuring the flow rate of an intelligent measurement and control gate using a channel according to claim 1, characterized in that, The intelligent measurement and control gate (1) conducts flow rate comparison measurement at different opening degrees.

3. The comparison measurement method of the system for in-situ measuring the flow rate of an intelligent measurement and control gate using a channel according to claim 1, characterized in that, The height of the bottom plate for water flow of the upper weir (2), middle weir (3) and lower weir (4) from the bottom of the channel is not less than 1 / 10 of the channel depth, and the elevation of the bottom plate for water flow of the lower weir (4) is not higher than that of the bottom plate for water flow of the middle weir (3).

4. The ratio measurement method of the system for in-situ measuring the flow rate of an intelligent measurement and control gate using a channel according to claim 1 or 3, characterized in that, The volume of the middle pool (6) is not less than the water flow volume in 10 minutes when the intelligent measurement and control gate (1) is fully open. The volume of the lower pool (7) is not greater than 1 / 100 of the volume of the middle pool (6). The maximum flow rate of the reflux pump (8) is not less than the full - open flow rate of the intelligent measurement and control gate (1).

5. The specific comparison method for the system of in-situ measuring the flow rate of an intelligent measurement and control gate using a channel according to claim 1, characterized in that, The upper weir (2), middle weir (3) and lower weir (4) cannot leak. The cofferdam body is formed by concrete pouring. The gate is welded by steel sections and steel plates. Polyvinyl chloride films are laid in the channel sections of the upper pool (5), middle pool (6) and lower pool (7).

6. The comparison measurement method of the system for in-situ measuring the flow rate of an intelligent measurement and control gate using a channel according to claim 1, characterized in that, The flowmeter (9) adopts an external - clamp ultrasonic flowmeter for pipeline or an internal - pipeline differential pressure flowmeter.

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