Gate flow meter combined with channel flat gate and flow measurement method thereof

Abstract

The present invention discloses a gate flow meter combined with a flat gate of a channel and a flow measurement method thereof, comprising a pair of channel water flow form monitoring devices and a flow monitoring controller respectively arranged on the upstream and downstream sides of two gate slots of the flat gate. Flow measurement method: S1, constructing a three-section flow measurement environment of the channel; S2, the flow monitoring controller issues a control instruction to control the pressure water level monitoring instruments on the upstream and downstream sides to measure the flow in the monitoring period Δ t According to the set acquisition frequency, the water level data of the upstream monitoring section Ls and the water level data of the downstream monitoring section Lx are collected synchronously; S3, the flow rate of the monitored section Le is calculated. The present invention breaks through the traditional flow measurement method. Through the channel water flow form monitoring device installed on the upstream and downstream sides of the monitored flat gate and the changes in the upstream and downstream water levels of the monitored channel section caused by the action of the channel side wall, the average flow of the monitored flat gate is monitored and calculated through the energy conservation and channel continuity equation, which has the advantage of high measurement accuracy.

Description

Technical Field

[0001] The invention relates to the field of open channel flow monitoring, in particular to a gate flow meter combined with a channel flat gate and a flow measurement method thereof. Background Art

[0002] Accurate monitoring of open channel flow is the basis for water conservation in irrigation areas, and is the basis for refined management of water resources and optimized channel scheduling, especially for flow monitoring of gate valves in water transfer channels. At present, there are almost no flow meters on the market that can be combined with channel flat gates. Existing flow meters used for measuring flow at channel flat gates mostly use a time difference flow measurement box connected in front of the gate, and the gate flow meter produced by Australia Rubicon Water Systems Technology Co., Ltd. is used to measure the flow velocity of the fluid in the flow measurement box. This gate flow measurement method is only applicable to water diversion outlets, and is not applicable to flow measurement at main stream control gates. In addition, flow measurement and control are separated into two sets of equipment, which makes it difficult to achieve integrated measurement and control, and the cost is relatively high. Summary of the invention

[0003] The present invention aims to provide a gate flow meter which is combined with a channel flat gate and has high measuring accuracy and is easy to install. Another object of the present invention is to provide a flow measurement method of the gate flow meter.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The gate flowmeter combined with the channel flat gate of the present invention comprises a pair of channel water flow morphology monitoring devices arranged on the upstream side of the two gate slots of the flat gate, and a pair of channel water flow morphology monitoring devices arranged on the downstream side of the two gate slots of the flat gate, and a flow monitoring controller arranged outside the channel; each of the channel water flow morphology monitoring devices has the same structure, and comprises: a vertical cylinder with a right-angled triangle cross-section, a base is arranged at the lower tube mouth of the vertical cylinder, a vertical pipe is arranged in the vertical cylinder, and filter holes for eliminating water flow disturbances are opened on the hypotenuse plate surface of the vertical cylinder and on the circumferential surface of the vertical pipe; a pressure water level monitor is arranged on the base inside the vertical pipe, and the control interface of the pressure water level monitor is led out from the upper tube mouth of the vertical cylinder through a cable, and the control interface cable is connected to the flow monitoring controller.

[0006] The flow monitoring controller comprises:

[0007] A basic parameter input control module, used to input the rectangular channel width, the flat gate width, the vertical tube water blocking width and monitoring control parameters and store them in a memory;

[0008] A control module, used to issue a control instruction to control the pressure water level monitor of each channel water flow form monitoring device to synchronously collect the water level of the channel section monitored by each of them according to the set collection frequency within the set monitoring period and calculate the average water level within the set monitoring period and the area of ​​the water-passing section of the average water level;

[0009] The instantaneous flow monitoring and calculation module is used to calculate the instantaneous average flow of the monitored section within the set monitoring period and calculate the average flow of the monitored section within the set monitoring time period.

[0010] The filter holes arranged on the inclined side plate surface of the vertical tube and the peripheral surface of the vertical pipe are all rectangular vertical holes.

[0011] Notches are respectively opened on the bottom pipe wall of the vertical pipe to facilitate canal water to smoothly enter the upstream and downstream side vertical pipes.

[0012] The flow measurement method of the gate flowmeter of the present invention comprises the following steps:

[0013] S1, construct the three-section flow measurement environment of the channel:

[0014] A pair of channel flow pattern monitoring devices are respectively installed on the upstream and downstream sides of two gate slots of the flat gate located at the designated side flow in the channel, and the steps are as follows:

[0015] S1.1, place the base of each of the channel water flow form monitoring devices on the bottom of the channel, and fix the two right-angled plate surfaces of each of the vertical tubes to the channel wall and the corresponding gate groove, so that the upper tube mouth of the vertical tube extends above the channel;

[0016] S1.2, set the channel section where the flat gate is located as the monitored section Le, set the upstream edge of the vertical cylinder on the upstream side of the gate slot as the upstream monitoring section Ls, and set the downstream edge of the vertical cylinder on the downstream side of the gate slot as the downstream monitoring section Lx; the pressure water level monitors of a pair of channel flow form monitoring devices on the upstream side are used to monitor the pressure level of the channel flow form monitoring devices during the set monitoring period Δ t The water level of the upstream monitoring section Ls is collected according to the set collection frequency, and the pressure water level monitor of a pair of channel water flow form monitoring devices on the downstream side is used to monitor the water level of the upstream monitoring section Ls in the set monitoring period Δ t The water level of the downstream monitoring section Ls is collected according to the set collection frequency;

[0017] S3, flow calculation of monitored section Le:

[0018] The control module will obtain the average water level hs data, average water level hx data, and average water area Data, average water area Data and average water area The data is output to the instantaneous flow monitoring calculation module, which derives the Δ based on the above parameters according to the energy conservation principle of the three sections. t The calculation method of average flow rate during a period is as follows:

[0019] According to the three-section energy conservation principle, the instantaneous average total energy E of the upstream monitoring section Ls is LS Subtract the instantaneous average total energy E of the downstream monitoring section Lx Lx Equal to the average momentum change ΔE of the monitored section Le Lx ,in:

[0020] ;

[0021] ;

[0022] At the same time, according to the channel flow continuity equation Q s =Q x =Q e have:

[0023] ;

[0024] Thus we get

[0025] ;

[0026] Q s : The upstream monitoring section Ls is in Δ t Average flow rate during the time period;

[0027] Q x : Downstream monitoring section Lx in Δ t Average flow rate during the time period;

[0028] Q e : The monitored section Le is in Δ t Average flow rate during the time period;

[0029] m : Δ t The average quality of water flowing through the three sections Ls, Le and Lx during a period of time;

[0030] V s : The upstream monitoring section Ls is in Δ t Average flow rate during the time period;

[0031] V x : Downstream monitoring section Lx in Δ t Average flow rate during the time period;

[0032] V e : The monitored section Le is in Δ t Average flow rate during the time period;

[0033] g - acceleration due to gravity.

[0034] In S2, the monitoring period Δt is set between 5 seconds and 60 seconds, the acquisition frequency is 2-3 times per second, and the average water level hs data of the upstream monitoring section Ls and the average water level hx data of the downstream monitoring section Lx are calculated once in each monitoring period Δt; when calculating the average water level hs data and the average water level hx data, the maximum value and the minimum value are removed respectively and the average value is taken.

[0035] The present invention breaks through the traditional flow measurement method. Through the changes in the upper and lower water levels of the monitored section of the channel caused by the channel side wall action, the average flow of the monitored flat gate is monitored and calculated through the energy conservation and channel continuity equation. The error caused by the traditional flow measurement method is eliminated, parameter calibration is not required, and it has the advantages of high measurement accuracy, simple installation and flow measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the open channel water flow pattern monitoring device of the present invention.

[0037] Figure 2 yes Figure 1 AA section enlarged structural diagram.

[0038] Figure 3 It is a schematic diagram of the structure of the riser of the present invention.

[0039] Figure 4 It is a plan view of the channel water flow pattern monitoring device of the present invention arranged in a channel.

[0040] Figure 5 It is a block diagram of the circuit control system of the present invention.

[0041] Figure 6 It is a flowchart of the flow measurement method of the present invention. DETAILED DESCRIPTION

[0042] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0043] like Figure 1-5As shown, the gate flowmeter combined with the channel flat gate of the present invention comprises a pair of channel water flow form monitoring devices arranged on the upstream side of the two gate slots of the flat gate 1, and a pair of channel water flow form monitoring devices arranged on the downstream side of the two gate slots of the flat gate 1, and a flow monitoring controller arranged outside the rectangular channel 2; each channel water flow form monitoring device has the same structure, and comprises: a vertical cylinder 3 with a right-angled triangle cross section, a base 4 is arranged at the lower tube mouth of the vertical cylinder 3, a vertical pipe 5 is arranged in the vertical cylinder 3, and filter holes 7.1 and 7.2 for eliminating water flow disturbance are opened on the inclined plate surface 6 of the vertical cylinder 3 and the peripheral surface of the vertical pipe 5, and the filter holes 7.1 and 7.2 are rectangular vertical holes, which are more conducive to eliminating water flow disturbance; a notch 8 is opened on the bottom pipe body wall of the vertical pipe 5, so that the channel water can smoothly enter the upstream and downstream side vertical pipes 5. A pressure water level monitor 9 is arranged on the base 4 in the riser 5. The control interface of the pressure water level monitor 9 is led out from the upper tube port of the riser 3 through a cable and connected to the flow monitoring controller.

[0044] The flow monitoring controller comprises:

[0045] A basic parameter input control module is used to input the width of the rectangular channel 2, the width of the flat gate 1, the water blocking width of the vertical tube 3 and monitoring control parameters and store them in the memory;

[0046] The control module is used to issue control instructions to control the pressure water level monitor 9 of each channel water flow form monitoring device to synchronously collect the water level of the channel section monitored by each of them according to the set collection frequency within the set monitoring period and calculate the average water level within the set monitoring period and the area of ​​the water-passing section of the average water level;

[0047] The instantaneous flow monitoring and calculation module is used to calculate the instantaneous average flow of the monitored section within the set monitoring period and calculate the average flow of the monitored section within the set monitoring time period.

[0048] like Figure 1-6 As shown, the flow measurement method of the gate flowmeter of the present invention comprises the following steps:

[0049] S1, construct the three-section flow measurement environment of the channel:

[0050] A pair of channel flow pattern monitoring devices are installed on the upstream and downstream sides of the two gate slots of the flat gate 1 located at the designated side flow in the rectangular channel 2, respectively, and the steps are as follows:

[0051] S1.1, place the vertical tube base 4 of each channel water flow form monitoring device on the bottom of the channel, fix the two right-angled plate surfaces 10 and 11 of each vertical tube 3 to the channel wall and the corresponding gate groove, and extend the upper tube mouth of the vertical tube 3 above the rectangular channel 2;

[0052] S1.2, set the channel section where the flat gate 1 is located as the monitored section Le, set the upstream edge of the vertical cylinder 3 located on the upstream side of the gate slot as the upstream monitoring section Ls, and set the downstream edge of the vertical cylinder 3 located on the downstream side of the gate slot as the downstream monitoring section Lx; the pressure water level monitor 9 of a pair of channel water flow form monitoring devices on the upstream side is used to monitor the pressure level of the channel flow form monitoring device during the set monitoring period Δ t The water level of the upstream monitoring section Ls is collected according to the set collection frequency, and the pressure water level monitor 9 of a pair of channel water flow form monitoring devices on the downstream side is used to monitor the water level of the upstream monitoring section Ls in the set monitoring period Δ t The water level of the downstream monitoring section Ls is collected according to the set collection frequency;

[0053] S2, the control module issues a control instruction to control the pressure water level monitors located at the upstream and downstream sides to monitor the water level during the set monitoring period Δ t According to the set acquisition frequency, the water level data of the upstream monitoring section Ls and the downstream monitoring section Lx are collected synchronously, and the water level data of the upstream monitoring section Ls and the downstream monitoring section Lx are calculated in the set monitoring period Δ t The average water level hs data of the upstream monitoring section Ls, the average water level hx data of the downstream monitoring section Lx, and the water flow area of ​​the monitored section Le Data, average water flow area of ​​upstream monitoring section Ls Data, average water flow area of ​​downstream monitoring section Lx Data; Among them, the water flow area of ​​the monitored section Le It is equal to the opening of flat gate 1 multiplied by the flow width of flat gate 1;

[0054] S3, flow calculation of monitored section Le:

[0055] The control module will obtain the average water level hs data, average water level hx data, and average water area Data, average water area Data and average water area The data is output to the instantaneous flow monitoring calculation module, which derives the Δ based on the above parameters according to the energy conservation principle of the three sections. t The calculation method of average flow rate during a period is as follows:

[0056] According to the three-section energy conservation principle, the instantaneous average total energy E of the upstream monitoring section Ls is LS Subtract the instantaneous average total energy E of the downstream monitoring section Lx Lx Equal to the average momentum change ΔE of the monitored section Le Lx ,in:

[0057] ;

[0058] ;

[0059] At the same time, according to the channel flow continuity equation Q s =Q x =Q e have:

[0060] ;

[0061] Thus we get

[0062] ;

[0063] Q s : The upstream monitoring section Ls is in Δ t Average flow rate during the time period;

[0064] Q x : Downstream monitoring section Lx in Δ t Average flow rate during the time period;

[0065] Q e : The monitored section Le is in Δ t Average flow rate during the time period;

[0066] m : Δ t The average quality of water flowing through the three sections Ls, Le and Lx during a period of time;

[0067] V s : The upstream monitoring section Ls is in Δ t Average flow rate during the time period;

[0068] V x : Downstream monitoring section Lx in Δ t Average flow rate during the time period;

[0069] V e : The monitored section Le is in Δ t Average flow rate during the time period;

[0070] g - acceleration due to gravity.

[0071] In S2, the set monitoring period ∆t is selected between 5 seconds and 60 seconds, the collection frequency is 2-3 times per second, and the average water level hs data of the upstream monitoring section Ls and the average water level hx data of the downstream monitoring section Lx are calculated once in each monitoring period ∆t; when calculating the average water level hs data and the average water level hx data, the maximum value and the minimum value are removed respectively and the average value is taken.

Claims

1. A gate flow meter combined with a channel flat gate, characterized in that: It includes a pair of channel water flow form monitoring devices arranged on the upstream side of two gate slots of the flat plate gate, a pair of channel water flow form monitoring devices arranged on the downstream side of the two gate slots of the flat plate gate, and a flow monitoring controller arranged outside the channel; Each of the channel water flow form monitoring devices has the same structure, and comprises: a vertical tube with a right-angled triangle cross-section, a base is provided at the lower tube mouth of the vertical tube, a vertical pipe is provided in the vertical tube, and filter holes for eliminating water flow disturbances are provided on the hypotenuse plate surface of the vertical tube and on the circumferential surface of the vertical pipe; a pressure water level monitor is provided on the base inside the vertical pipe, and a control interface of the pressure water level monitor is led out from the upper tube mouth of the vertical tube through a cable, and the control interface cable is connected to the flow monitoring controller.

2. The gate flow meter combined with the channel flat gate according to claim 1, characterized in that: The flow monitoring controller comprises: A basic parameter input control module is used to input rectangular channel width, flat gate width, vertical tube water blocking width and monitoring control parameters and store them in a memory; A control module, used to issue a control instruction to control the pressure water level monitor of each channel water flow form monitoring device to synchronously collect the water level of the channel section monitored by each of them according to the set collection frequency within the set monitoring period and calculate the average water level within the set monitoring period and the area of ​​the water-passing section of the average water level; The instantaneous flow monitoring and calculation module is used to calculate the instantaneous average flow of the monitored section within the set monitoring period and calculate the average flow of the monitored section within the set monitoring time period.

3. The gate flow meter combined with a channel flat gate according to claim 1 or 2, characterized in that: The filter holes arranged on the inclined side plate surface of the vertical tube and the peripheral surface of the vertical pipe are all rectangular vertical holes.

4. The gate flow meter combined with a channel flat gate according to claim 1 or 2, characterized in that: Notches are respectively opened on the bottom pipe wall of the vertical pipe to facilitate canal water to smoothly enter the upstream and downstream side vertical pipes.

5. The flow measurement method of the gate flowmeter according to claim 1, characterized in that: The steps include: S1, construct the three-section flow measurement environment of the channel: A pair of channel flow pattern monitoring devices are installed on the upstream and downstream sides of two gate slots of the flat gate located at the designated side flow in the channel, respectively, and the steps are as follows: S1.1, place the base of each of the channel water flow form monitoring devices on the bottom of the channel, and fix the two right-angled plate surfaces of each of the vertical tubes to the channel wall and the corresponding gate groove, so that the upper tube mouth of the vertical tube extends above the channel; S1.2, set the channel section where the flat gate is located as the monitored section Le, set the upstream edge of the vertical cylinder on the upstream side of the gate slot as the upstream monitoring section Ls, and set the downstream edge of the vertical cylinder on the downstream side of the gate slot as the downstream monitoring section Lx; the pressure water level monitors of a pair of channel flow form monitoring devices on the upstream side are used to monitor the pressure level of the channel flow form monitoring devices during the set monitoring period Δ t The water level of the upstream monitoring section Ls is collected according to the set collection frequency, and the pressure water level monitor of a pair of channel water flow form monitoring devices on the downstream side is used to monitor the water level of the upstream monitoring section Ls in the set monitoring period Δ t The water level of the downstream monitoring section Ls is collected according to the set collection frequency; S2, the control module issues a control instruction to control the pressure water level monitors located at the upstream and downstream sides to monitor the water level during the set monitoring period Δ t According to the set acquisition frequency, the water level data of the upstream monitoring section Ls and the downstream monitoring section Lx are collected synchronously, and the water level data of the set monitoring period Δ t The average water level hs data of the upstream monitoring section Ls, the average water level hx data of the downstream monitoring section Lx, and the water flow area of ​​the monitored section Le Data, average water flow area of ​​upstream monitoring section Ls Data, average water flow area of ​​downstream monitoring section Lx Data; Among them, the water flow area of ​​the monitored section Le It is equal to the flat gate opening multiplied by the flat gate flow width; S3, flow calculation of monitored section Le: The control module will obtain the average water level hs data, average water level hx data, and average water area Data, average water area Data and average water area The data is output to the instantaneous flow monitoring calculation module, which derives the Δ based on the above parameters according to the energy conservation principle of the three sections. t The calculation method of average flow rate during a period is as follows: According to the three-section energy conservation principle, the instantaneous average total energy E of the upstream monitoring section Ls is LS Subtract the instantaneous average total energy E of the downstream monitoring section Lx Lx Equal to the average momentum change ΔE of the monitored section Le Lx ,in: ； ； ； ； At the same time, according to the channel flow continuity equation Q s =Q x =Q e have: ； Thus we get ； Q s : The upstream monitoring section Ls is in Δ t Average flow rate during the time period; Q x : Downstream monitoring section Lx in Δ t Average flow rate during the time period; Q e : The monitored section Le is in Δ t Average flow rate during the time period; m : Δ t The average quality of water flowing through the three sections Ls, Le and Lx during a period of time; V s : The upstream monitoring section Ls is in Δ t Average flow rate during the time period; V x : Downstream monitoring section Lx in Δ t Average flow rate during the time period; V e : The monitored section Le is in Δ t Average flow rate during the time period; g - acceleration due to gravity.

6. The monitoring method of the gate flowmeter according to claim 5, characterized in that: In S2, the monitoring period Δt is set between 5 seconds and 60 seconds, the acquisition frequency is 2-3 times per second, and the average water level hs data of the upstream monitoring section Ls and the average water level hx data of the downstream monitoring section Lx are calculated once in each monitoring period Δt; when calculating the average water level hs data and the average water level hx data, the maximum value and the minimum value are removed respectively and the average value is taken.

Images