CN214621403U - System for calibrating millimeter wave radar flowmeter and testing performance - Google Patents
System for calibrating millimeter wave radar flowmeter and testing performance Download PDFInfo
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- CN214621403U CN214621403U CN202120980583.4U CN202120980583U CN214621403U CN 214621403 U CN214621403 U CN 214621403U CN 202120980583 U CN202120980583 U CN 202120980583U CN 214621403 U CN214621403 U CN 214621403U
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Abstract
The utility model relates to a system for be used for demarcating millimeter wave radar flowmeter and performance test, including test irrigation canals and ditches, be located the inlet tank and the storage water tank of test irrigation canals and ditches both ends, be equipped with flow control device between inlet tank and the test irrigation canals and ditches, be connected with the marshall groove between storage water tank and the test irrigation canals and ditches; a sensor is arranged at an inlet of the Parshall tank, the flow control device comprises a slide rail and a closing door, one side of the water storage tank, which is far away from the Parshall tank, is connected with a sewer pipeline, a water pump is arranged on the sewer pipeline, the water pump is used for pumping test fluid into the water inlet tank, and a first valve is arranged on the pipeline where the water pump is arranged; the test fluid output by the first valve flows into the test ditch, a branch is led out from a pipeline where the water pump is located, the branch is led to the water inlet direction of the water pump from the water outlet direction of the water pump, and a second valve is arranged on the branch. The utility model discloses can increase or reduce the test water flow who supplies with the Parshall groove entry upper reaches, can inspect the precision performance of millimeter wave radar flowmeter full-scale range.
Description
Technical Field
The utility model belongs to the technical field of flow test technique and specifically relates to a system for be used for demarcating millimeter wave radar flowmeter and capability test.
Background
The flow monitoring of irrigation and water conservancy ditches and urban river channels plays an important role in the construction process of related projects of smart cities and smart agriculture, the existing flow meter products based on the millimeter wave radar are mostly obtained by estimating the average flow velocity through the measurement values of the surface flow velocity and the fluid height by means of an empirical formula for flow measurement of river channels and ditches, and the estimation formula of the average flow velocity is often constructed according to the test value of a certain river channel or ditch in a period of time and is difficult to have universality; the results obtained by this measurement are not accurate enough.
SUMMERY OF THE UTILITY MODEL
The applicant aims at the defects in the prior art and provides a system for calibrating and testing the performance of the millimeter wave radar flowmeter, which is reasonable in structure.
The utility model discloses the technical scheme who adopts as follows:
a system for calibrating and testing performance of a millimeter wave radar flow meter comprises a test ditch, a water inlet tank and a water storage tank, wherein the water inlet tank and the water storage tank are positioned at two ends of the test ditch; a sensor is arranged at the inlet of the Parshall tank,
the flow control device includes:
the first sliding rail is fixedly arranged at the top of the side wall of the opening of the water inlet tank, the midpoint of the first sliding rail is vertically connected with a second sliding rail, and one end of the second sliding rail, which is far away from the first sliding rail, is connected with a fixed rail parallel to the first sliding rail;
the closed doors are symmetrically arranged on one side of the test ditch close to the water inlet tank, the closed doors are symmetrically arranged, the closed doors on the two sides are both connected with driven bolts, a driving bolt is movably arranged in the second slide rail, a rotary connecting rod is connected between the driving bolt and the driven bolts, the driving bolt and the driven bolts are both rotationally connected with the rotary connecting rod,
one side of the water storage tank, which is far away from the Parshall groove, is connected with a water drainage pipeline, a water pump is arranged on the water drainage pipeline, the water pump is used for pumping test fluid into the water inlet tank, and a first valve is arranged on the pipeline where the water pump is arranged; the test fluid output from the first valve flows into the test trench,
a branch is also led out from the pipeline where the water pump is positioned, the branch is led to the water inlet direction of the water pump from the water outlet direction of the water pump, and a second valve is arranged on the branch.
As a further improvement of the above technical solution:
the test ditch includes the invariable test section of canal width, is located the transition section between test section and the case of intaking, the canal width of transition section reduces from the case of intaking to the test section gradually.
The included angle between the deflection angle of the two side walls of the transition section and the main flow direction of the water flow of the test section is a contraction angle, and the value range of the contraction angle is 3-7 degrees.
The test section includes a buffer zone, and the buffer zone is located the test section and is close to water tank one end, and the canal length of buffer zone is greater than or equal to 50 times hydraulic radius.
The downstream of the buffer zone and the inlet of the Parshall tank are flow testing positions, and flow meters are correspondingly arranged.
The sensor is located at the inlet of the Parshall cell, directly above or at the bottom center.
An altimeter is arranged at the inlet of the Parshall tank, and the water level height measured by the altimeter calculates the flow rate by the following Parshall tank empirical formula:
Q＝N·Ha
in the formula: q is the water flow rate, H is the measured liquid level height, N, a is an empirical constant determined from different types of baschel tanks, N177.1 for baschel tank No. 3, and a 1.55.
The altimeter adopts two types, namely a radar altimeter and an ultrasonic water level altimeter.
The sensor adopts a millimeter wave radar or an ultrasonic sensor.
The utility model has the advantages as follows:
the utility model discloses rational in infrastructure, convenient operation measures the flow through adopting Parshall groove, millimeter wave radar, ultrasonic sensor.
In the utility model, a plurality of flow control structures are arranged, including a movably arranged closing door, a transition section and a buffer area, so that the water flow is stable and the accurate measurement is convenient; the flow rate can be adjusted to increase or decrease the flow rate of the test water supplied to the upstream of the inlet of the Parshall cell, and the full-range accuracy performance of the millimeter wave radar flowmeter can be checked.
The millimeter wave radar and the ultrasonic sensor are jointly arranged at the top and the bottom of the inlet of the Parshall tank, so that the novel test on the height of the fluid in the flow channel can be jointly carried out, and the flow can be measured through the height of the fluid; the liquid level height can be accurately measured when the fluid flow is high, the flow speed is high, the water surface wave is large or part of the liquid surface is frozen.
The utility model provides a loop setting can carry out the continuous test in batches to the flowmeter.
The utility model discloses a millimeter wave radar flowmeter's demarcation and precision performance verify and provide the foundation.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural view of the flow control device of the present invention.
Fig. 3 is a schematic diagram of the fluid flow direction of the present invention.
Wherein: 1. testing the ditch; 2. a water inlet tank; 3. a water storage tank; 4. a flow control device; 5. a Parshall cell; 6. a first slide rail; 7. a second slide rail; 8. a fixed rail; 9. closing the door; 10. a slave bolt; 11. an active bolt; 12. a rotating connecting rod;
101. a testing section; 102. a transition section; 103. a buffer area.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1-3, the system for calibrating and testing the performance of the millimeter wave radar flow meter of the present embodiment includes a testing channel 1, a water inlet tank 2 and a water storage tank 3 located at two ends of the testing channel 1, a flow control device 4 is disposed between the water inlet tank 2 and the testing channel 1, and a baschel tank 5 is connected between the water storage tank 3 and the testing channel 1; a sensor is arranged at the inlet of the Parshall tank 5; the height of the water storage tank 3 is such that the bottom of the outlet of the Parshall tank 5 is 30cm higher than the pipe diameter top of the sewer pipe.
The flow control device 4 includes:
the first sliding rail 6 is fixedly arranged at the top of the open side wall of the water inlet tank 2, the midpoint of the first sliding rail 6 is vertically connected with a second sliding rail 7, and one end, deviating from the first sliding rail 6, of the second sliding rail 7 is connected with a fixed rail 8 parallel to the first sliding rail 6;
the closed doors 9 are symmetrically arranged on one side of the test ditch 1 close to the water inlet tank 2, the closed doors 9 are symmetrically arranged, the closed doors 9 on two sides are both connected with driven bolts 10, a driving bolt 11 is movably arranged in the second slide rail 7, a rotary connecting rod 12 is connected between the driving bolt 11 and the driven bolt 10, the driving bolt 11 and the driven bolt 10 are both rotatably connected with the rotary connecting rod 12,
one side of the water storage tank 3, which is far away from the Parshall tank 5, is connected with a water drainage pipeline, a water pump is arranged on the water drainage pipeline, the water pump is used for pumping test fluid into the water inlet tank 2, and a first valve is arranged on the pipeline where the water pump is arranged; the test fluid output from the first valve flows into the test trench 1,
a branch is also led out from the pipeline where the water pump is positioned, the branch is led to the water inlet direction of the water pump from the water outlet direction of the water pump, and a second valve is arranged on the branch.
The test trench 1 comprises a test section 101 with constant trench width and a transition section 102 positioned between the test section 101 and the water inlet tank 2, wherein the trench width of the transition section 102 is gradually reduced from the water inlet tank 2 to the test section 101.
The included angle between the deflection angle of the two side walls of the transition section 102 and the main flow direction of the water flow of the test section 101 is a contraction angle, the value range of the contraction angle is 3-7 degrees, the selectable node values in the embodiment are end point values of 3 degrees, 7 degrees and a middle value of 5 degrees. The excessive contraction angle can cause the water flow turbulence to be intensified, the water surface fluctuation is generated, and the flow capacity is reduced.
The test section 101 comprises a buffer area 103, the buffer area 103 is located at one end of the test section 101 close to the water inlet tank 2, and the channel length of the buffer area 103 is greater than or equal to 50 times of the hydraulic radius. In this embodiment, the channel length of the buffer 103 is equal to 50 times the hydraulic radius.
The downstream of the buffer zone 103 and the inlet of the Parshall tank 5 are flow measuring positions, and flow meters are correspondingly arranged.
The sensor is located directly above or centrally at the bottom of the inlet of the Parshall cell 5.
An altimeter is arranged at the inlet of the Parshall tank 5, and the water level height measured by the altimeter calculates the flow rate through the following empirical formula of the Parshall tank 5:
Q＝N·Ha
in the formula: q is the water flow rate, H is the measured liquid level height, N, a is an empirical constant determined from different types of the baschel tank 5, the baschel tank 5 No. 3 is used in this example, N is 177.1 and a is 1.55 for the baschel tank 5 No. 3.
The altimeter adopts two types, namely a radar altimeter and an ultrasonic water level altimeter. The purpose of adopting two kinds of height measuring equipment is when there is a small amount of ice, saw-dust, leaf etc. in the rivers of this mouth of a river position and float impurity, can test rivers flow more accurately.
The sensor adopts a millimeter wave radar or an ultrasonic sensor.
The specific structure and test process of this embodiment are as follows:
as shown in fig. 1 and 2, the water inlet tank 2 is included, the water outlet direction of the water inlet tank 2 is open, the closing doors 9 are symmetrically arranged on two sides of the opening, the top of each closing door 9 is provided with a flow control device 4, and the opening degree of each closing door 9 is driven by the flow control device 4 to adjust the output flow.
The structure of the flow control device 4 is as shown in fig. 2, a driving bolt 11 and a driven bolt 10 are arranged on a fixed i-shaped track assembly, the driving bolt 11 pulls the driven bolt 10 through a rotating connecting rod 12 in the process of moving on the second slide rail 7, the driven bolt 10 is fixedly connected with the closing door 9, the closing door 9 is driven to be closed or opened, and the flow control is realized.
One side of the closed door 9, which is far away from the water inlet tank 2, is communicated with a transition section 102, the channel width of the section is gradually reduced from the closed door 9, then a buffer section with unchanged channel width is arranged, one end of the buffer section, which is far away from the transition section 102, is communicated with a testing section 101, the outlet of the testing section 101 is connected with a Parshall tank 5, and the outlet of the Parshall tank 5 is connected with a water storage tank 3.
As shown in fig. 3, in this embodiment, a water flow branch is provided to protect the water pump. The water storage tank 3 or the test ditch 1 is communicated with a sewer pipeline for pumping the output fluid back to the position before the water inlet tank 2, the sewer pipeline is connected with a water pump and a first valve, the water pump is used for providing pumping power, two sides of the water inlet and the water outlet of the water pump are communicated with a branch, and the branch is provided with a second valve for assisting in controlling the flow. When the flow demand of the test ditch 1 is reduced, the second valve connected with the water flow branch can be opened to be large, and the first valve connected with the test ditch is reduced at the same time, so that the water pump motor is protected from being damaged in the continuous test.
The closing door 9 in this embodiment is symmetrically opened and closed, and the symmetric opening and closing is to avoid the flow velocity of the downstream water flow from deviating to generate additional shock waves to affect the flow test.
All install the sensor directly over, bottom central point put in the entrance of the marshall groove 5, if it is not high to the measurement requirement, also can reach the measurement purpose with bottom central point puts arbitrary one installation sensor directly over the entry position, the utility model discloses in require higher to the measurement, consequently two all set up the sensor, and the sensor adopts millimeter wave radar, ultrasonic sensor.
Installing flow meters downstream of the buffer zone 103 and at the inlet of the Parshall tank 5;
a height gauge is provided at the inlet of the marshall tank 5.
The utility model discloses a theory of operation is: the millimeter wave radar and the ultrasonic sensor which are positioned right above the inlet of the Barshall tank 5 or at the center of the bottom of the Barshall tank 5 monitor the height of the fluid flowing into the Barshall tank 5 in real time, so that the real-time channel fluid flow is obtained through a fitting formula according to the model of the Barshall tank 5 and the height correspondence of the fluid therein and is used as the standard of the precision test after calibration.
The length of the flowmeter is determined according to the model of a sensor to be tested when the fluid is at the downstream of the buffer area 103 of the test ditch 1 and before the inlet of the Barschel groove 5, the wave height of the fluid is gentle when the fluid is at the downstream of the buffer area 103, shock waves generated by the impact of the side wall of the ditch are buffered and then become small, the water flow tends to be stable, the test water flow enters a water pump through a water drainage pipeline connected with a water storage tank 3, and the flow of the test section 101 is adjusted by adjusting a flow controller, a first valve and a second valve according to requirements, so that the flow of the test fluid supplied to the upstream of the inlet of the Barschel groove 5 is increased or reduced, and the full-scale range precision performance of the millimeter wave radar flowmeter is tested.
In the embodiment, the millimeter wave radar and the ultrasonic sensor are jointly arranged at the top and the bottom of the inlet of the Parshall tank 5, the height of the fluid in the flow channel is jointly tested, and the average value is obtained or judged according to the error condition so as to discard the wrong test value, thereby ensuring that the liquid level height can be accurately measured when the fluid flow is high, the flow speed is high, the water surface wave is large or part of the liquid level is frozen.
As an alternative embodiment, the channel shape of the flow test area can be connected with a U-shaped groove, a trapezoid groove and a combined groove for testing in addition to a rectangular groove, so that the results of the millimeter wave radar in calibration and detection are closer to the actual use condition, and the measured results are more accurate.
As an alternative embodiment, instead of the Parshall tank 5, a suitable triangular weir, rectangular weir or trapezoidal weir may be selected for flow metering according to the objective situation.
Since the installation of the sensor is a conventional technical means, the position for installing the sensor is only indicated in the embodiment, and the installation mode of the sensor is not required to be protected.
The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made within the scope of the invention.
Claims (9)
1. The utility model provides a system for be used for demarcating millimeter wave radar flowmeter and capability test, includes test irrigation canals and ditches (1), is located intake case (2) and storage water tank (3) at test irrigation canals and ditches (1) both ends, its characterized in that: a flow control device (4) is arranged between the water inlet tank (2) and the test ditch (1), and a Parshall tank (5) is connected between the water storage tank (3) and the test ditch (1); a sensor is arranged at the inlet of the Parshall tank (5),
the flow control device (4) comprises:
the first sliding rail (6) is fixedly arranged at the top of the open side wall of the water inlet tank (2), the middle point of the first sliding rail (6) is vertically connected with a second sliding rail (7), and one end, deviating from the first sliding rail (6), of the second sliding rail (7) is connected with a fixed rail (8) parallel to the first sliding rail (6);
the closing doors (9) are symmetrically arranged on one side, close to the water inlet tank (2), of the testing ditch (1), the closing doors (9) are symmetrically arranged, the closing doors (9) on two sides are both connected with driven bolts (10), a driving bolt (11) is movably arranged in the second slide rail (7), a rotary connecting rod (12) is connected between the driving bolt (11) and the driven bolt (10), the driving bolt (11) and the driven bolt (10) are both rotationally connected with the rotary connecting rod (12),
one side of the water storage tank (3) departing from the Parshall groove (5) is connected with a sewer pipeline, a water pump is arranged on the sewer pipeline and is used for pumping test fluid into the water inlet tank (2), and a pipeline where the water pump is arranged is provided with a first valve; the test fluid from the first valve flows into the test channel (1),
a branch is also led out from the pipeline where the water pump is positioned, the branch is led to the water inlet direction of the water pump from the water outlet direction of the water pump, and a second valve is arranged on the branch.
2. The system for calibration and performance testing of millimeter wave radar flow meters of claim 1, wherein: the test ditch (1) comprises a test section (101) with constant ditch width and a transition section (102) positioned between the test section (101) and the water inlet tank (2), wherein the ditch width of the transition section (102) is gradually reduced from the water inlet tank (2) to the test section (101).
3. The system for calibration and performance testing of millimeter wave radar flow meters of claim 2, wherein: the included angle between the deflection angle of the two side walls of the transition section (102) and the main flow direction of the water flow of the test section (101) is a contraction angle, and the value range of the contraction angle is 3-7 degrees.
4. The system for calibration and performance testing of millimeter wave radar flow meters of claim 2, wherein: the test section (101) comprises a buffer area (103), the buffer area (103) is located at one end, close to the water inlet tank (2), of the test section (101), and the channel length of the buffer area (103) is larger than or equal to 50 times of the hydraulic radius.
5. The system for calibration and performance testing of millimeter wave radar flow meters of claim 4, wherein: the downstream of the buffer area (103) and the inlet of the Parshall tank (5) are flow testing positions, and flow meters are correspondingly arranged.
6. The system for calibration and performance testing of millimeter wave radar flow meters of claim 1, wherein: the sensor is located at the position right above or at the bottom center of the inlet of the Parshall tank (5).
7. The system for calibration and performance testing of millimeter wave radar flow meters of claim 1, wherein: an altimeter is arranged at the inlet of the Parshall tank (5), and the water level height measured by the altimeter calculates the flow rate through the following empirical formula of the Parshall tank (5):
Q＝N·Ha
in the formula: q is the water flow, H is the measured liquid level height, N, a is an empirical constant determined from different types of marshall tanks (5), N is 177.1 and a is 1.55.
8. The system for calibration and performance testing of a millimeter wave radar flow meter of claim 7, wherein: the altimeter adopts two types, namely a radar altimeter and an ultrasonic water level altimeter.
9. The system for calibration and performance testing of millimeter wave radar flow meters of claim 1, wherein: the sensor adopts a millimeter wave radar or an ultrasonic sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120980583.4U CN214621403U (en) | 2021-05-08 | 2021-05-08 | System for calibrating millimeter wave radar flowmeter and testing performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120980583.4U CN214621403U (en) | 2021-05-08 | 2021-05-08 | System for calibrating millimeter wave radar flowmeter and testing performance |
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| Publication Number | Publication Date |
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| CN214621403U true CN214621403U (en) | 2021-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120980583.4U Active CN214621403U (en) | 2021-05-08 | 2021-05-08 | System for calibrating millimeter wave radar flowmeter and testing performance |
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- 2021-05-08 CN CN202120980583.4U patent/CN214621403U/en active Active
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