Box-type ultrasonic open channel flow measurement system and measurement method

Abstract

The box-type ultrasonic open channel flow measurement system comprises a control terminal and a flow measurement box electrically connected with the control terminal, first concave cavities, second concave cavities and third concave cavities are sequentially formed in the inner side face of a side plate of the flow measuring box in the water flow direction, the multiple first concave cavities, the multiple second concave cavities and the multiple third concave cavities are formed in the side plate in the vertical direction at intervals, and flow measuring mechanisms are arranged in the first concave cavities, the second concave cavities and the third concave cavities; all the flow measuring mechanisms can be matched and fed back so that the control terminal can calculate the flow speed and flow numerical values, in addition, a partition plate is horizontally arranged between the bottom plate and the top plate, and the height of the partition plate is located between any two third concave cavities of the same side plate. According to the structure, the flow measuring mechanism is also arranged in the middle position, the flow measuring mechanism at the position can feed back signals of the flow measuring mechanisms at the two ends and obtain more flow velocity conditions, and whether a blocking object exists in the flow measuring box or not can be judged by comparing different flow velocity conditions.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to a box-type ultrasonic open channel flow measurement system and a measurement method. Background Art

[0002] The flow measuring box can measure the flow velocity by setting up ultrasonic transducers in a cross-symmetrical arrangement at the front and rear ends, and can calculate the flow rate by cooperating with an electronic water gauge. However, some flow measuring boxes do not work in clean water, so silt accumulation or other similar obstructions often occur at the bottom of the flow measuring box. When the above problems occur, the flow measuring box will give erroneous values ​​in its detection of water flow velocity and flow. Moreover, as the obstructions accumulate, the deviation of the above erroneous values ​​will become larger and larger. However, since the flow measuring box itself does not have an alarm function, it is difficult to detect. Summary of the invention

[0003] In order to solve the problem that the flow measuring box described above is prone to detecting erroneous values ​​after an obstruction appears, and the staff is unable to detect the problem in time after the problem occurs, the present invention provides a box-type ultrasonic open channel flow measurement system and a measurement method.

[0004] The technical solution of the present invention is as follows:

[0005] A box-type ultrasonic open channel flow measurement system comprises a control terminal and a flow measurement box electrically connected to the control terminal;

[0006] The flow measuring box comprises a top plate and a bottom plate arranged at intervals in the vertical direction, and a side plate is symmetrically arranged between the top plate and the bottom plate, the vertical plane where the side plate is located is arranged parallel to the water flow direction, and the inner side surface of the side plate is sequentially arranged with a first concave cavity, a second concave cavity and a third concave cavity along the water flow direction, and a plurality of the first concave cavity, the second concave cavity and the third concave cavity are arranged at intervals in the side plate along the vertical direction, and a flow measuring mechanism is arranged in each of the first concave cavity, the second concave cavity and the third concave cavity;

[0007] The flow measuring mechanism comprises a mounting plate detachably connected to the first concave cavity, the second concave cavity or the third concave cavity, and an ultrasonic transducer is arranged above the mounting plate;

[0008] The ultrasonic transducer in the first concave cavity is arranged opposite to the ultrasonic transducer in the third concave cavity of the opposite side plate, the second concave cavity is located between the first concave cavity and the third concave cavity, and the ultrasonic transducer in the second concave cavity is arranged opposite to the ultrasonic transducer in the second concave cavity of the opposite side plate;

[0009] There is no shielding between any ultrasonic transducer and the ultrasonic transducer of the opposite side panel;

[0010] A partition is horizontally arranged between the bottom plate and the top plate, and the height of the partition is located between any two third concave cavities of the same side plate.

[0011] Different from the existing symmetrical arrangement of the front and rear sides, an ultrasonic transducer is also arranged in the middle position, and the ultrasonic transducer at this position can feed back the signals of the ultrasonic transducers at the two end positions.

[0012] As a preferred solution, the number of ultrasonic transducers on the same horizontal plane is 0 or 6.

[0013] As a preferred solution, the first cavity and the third cavity are respectively located at one end of the side plate close to the water inlet and one end of the side plate close to the water outlet, and the angle between the first cavity and the third cavity and the second cavity of the opposite side plate is less than or equal to 90°.

[0014] In order to avoid interference of the partition with the first cavity and the second cavity, the front end of the partition and the end of the second cavity close to the water outlet of the side plate are located in the same vertical plane, and the end of the partition is flush with one end of the water outlet of the side plate.

[0015] The box-type ultrasonic open channel flow measurement method uses the box-type ultrasonic open channel flow measurement system mentioned above and includes the following steps:

[0016] Step 1, build a standard model: set the flow box to be tested in a water channel that can control the flow rate of the liquid, trigger the ultrasonic transducer at the first cavity, and after the ultrasonic transducer in the second cavity receives the ultrasonic signal, trigger the ultrasonic transducer in the second cavity and feed it back to the ultrasonic transducer at the first cavity. The control terminal calculates the first flow rate value. After the ultrasonic transducer in the third cavity below the horizontal plane where the partition is located receives the signal of the ultrasonic transducer at the first cavity, it feeds back to the ultrasonic transducer at the first cavity. The control terminal calculates the second flow rate value. After the ultrasonic transducer in the third cavity above the horizontal plane where the partition is located receives the signal of the ultrasonic transducer at the first cavity, it feeds back To the ultrasonic transducer at the first concave cavity, the control terminal calculates the third flow velocity value, the ultrasonic transducer in the third concave cavity below the horizontal plane where the partition is located receives the signal of the ultrasonic transducer at the second concave cavity, and then feeds back to the ultrasonic transducer at the second concave cavity, and the control terminal calculates the fourth flow velocity value, the ultrasonic transducer in the third concave cavity above the horizontal plane where the partition is located receives the signal of the ultrasonic transducer at the second concave cavity, and then feeds back to the ultrasonic transducer at the second concave cavity, and the control terminal calculates the fifth flow velocity value, and when the initial flow velocity of the water channel is changed, the first flow velocity value, the second flow velocity value, the third flow velocity value, the fourth flow velocity value, and the fifth flow velocity value under different initial flow velocities are obtained respectively;

[0017] Step 2, establishing a standard database: establishing a database with the first flow rate value, the second flow rate value, the third flow rate value, the fourth flow rate value and the fifth flow rate value at different initial flow rates;

[0018] Step 3, judging whether there is an obstruction: the flow box to be detected is set in the water channel of the application scenario, and the first flow velocity value, the second flow velocity value, the fourth flow velocity value and the fifth flow velocity value of the flow box to be detected are obtained, and the first flow velocity value, the second flow velocity value, the fourth flow velocity value and the fifth flow velocity value corresponding to the initial flow velocity in the standard database are respectively subtracted. If the difference is within the set threshold range, it is judged that there is no obstruction; if the difference is not within the set threshold range, it is judged that there is an obstruction;

[0019] Set the fifth flow rate value as the initial flow rate.

[0020] Through the above method, it is possible to detect whether there is an obstruction, and then after setting up an alarm mechanism, the staff can be notified in time to clear the obstruction.

[0021] In order to calculate the rough flow rate value when an obstruction occurs, the method further includes step 4, rough flow rate value calculation, judging the first flow rate value or the second flow rate value information from the database information according to the fifth flow rate value, and the first flow rate value or the second flow rate value is a rough flow rate value. Although there is a certain error in the value compared to the case where there is no obstruction, the error is smaller than the first flow rate value detected directly when there is an obstruction.

[0022] The method for determining the position of the front section obstruction is as follows: in step three, the first flow velocity value, the third flow velocity value and the fifth flow velocity value of the flow box to be tested are obtained, and they are respectively subtracted from the first flow velocity value, the third flow velocity value and the fifth flow velocity value corresponding to the initial flow velocity in the standard database; if the difference is not within the set threshold range, it is determined that there is an obstruction in the front section of the flow box.

[0023] The method for determining the position of the middle obstruction is as follows: in step three, the second flow rate value, the third flow rate value and the fifth flow rate value of the flow box to be tested are obtained, and they are respectively subtracted from the second flow rate value, the third flow rate value and the fifth flow rate value corresponding to the initial flow rate in the standard database; if the difference is not within the set threshold range, it is determined that there is an obstruction in the middle section of the flow box.

[0024] The method for determining the position of the rear-end obstruction is as follows: in step three, the third flow velocity value, the fourth flow velocity value and the fifth flow velocity value of the flow box to be tested are obtained, and they are respectively subtracted from the third flow velocity value, the fourth flow velocity value and the fifth flow velocity value corresponding to the initial flow velocity in the standard database; if the difference is not within the set threshold range, it is determined that there is an obstruction in the rear section of the flow box.

[0025] The beneficial effects of the present invention are: the present invention is a box-type ultrasonic open channel flow measurement system and measurement method, which is different from the existing flow measurement box structure and method. The present device sets ultrasonic transducers at multiple positions, and through the coordinated feedback of each ultrasonic transducer, it can obtain flow velocity values ​​under various conditions, and under normal conditions, the first flow velocity value is the normal flow velocity value, but when an obstruction appears, the above-mentioned first flow velocity value will change. Compared with other flow velocity values, through the above-mentioned changes, it is possible to infer whether there is an obstruction and the position of the obstruction, and after the baffle is set, no silt-like obstructions will remain above the baffle. Therefore, by detecting the flow velocity value of the ultrasonic transducer at the position above the baffle, the rough flow velocity value can be inferred and then the flow rate can be calculated. Through the above method, although the rough flow velocity value and flow rate value cannot be obtained as in the case where there is no obstruction, the value inferred by comparing the database is smaller than the value detected when there is an obstruction and the difference with the standard value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0027] In the attached picture:

[0028] Figure 1 It is a front view structural schematic diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the top view structure of the present invention;

[0030] Figure 3 It is a schematic diagram of a top view and cross-sectional structure of the present invention;

[0031] Figure 4 for Figure 3 Schematic diagram of the structure in the state where there is an obstruction;

[0032] Figure 5 It is a schematic diagram of the cross-sectional structure of the present invention from top view (with Figure 3 Sectional views at different heights);

[0033] Figure 6 Based Figure 5 Schematic diagram of the structure in the state where there is an obstruction;

[0034] Figure 7 for Figure 3 Schematic diagram of the structure in the state of occlusion (occlusion and Figure 4 located in different locations);

[0035] Figure 8 It is a schematic diagram of the side cross-sectional structure of the present invention;

[0036] The components represented by the reference numerals in the figure are:

[0037] 1. Bottom plate; 2. Side plate; 21. First concave cavity; 22. Second concave cavity; 23. Third concave cavity; 3. Top plate; 4. Partition plate; 5. Flow measuring mechanism; 51. Ultrasonic transducer; 52. Mounting plate; 6. Shielding. DETAILED DESCRIPTION

[0038] The exemplary embodiments of the present disclosure will be described in more detail below in conjunction with the accompanying drawings. It should be noted that these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. The present disclosure can be implemented in various forms and should not be limited by the embodiments described herein.

[0039] Example

[0040] First of all, it should be noted that the system and method are only applicable to the case where the height of the obstruction is less than half the height of the partition, that is, the existence of the obstruction will not affect the normal flow rate of the water above the partition, and the water flow also needs to be higher than the partition. If the water flow does not exceed the partition and the flow rate cannot be calculated by the ultrasonic transducer above the partition, the system and method of the present invention cannot be used. Figure 1-8 The box-type ultrasonic open channel flow measurement system shown includes a control terminal and a flow measurement box electrically connected to the control terminal;

[0041] First of all, with regard to the structure of the flow measuring box, the flow measuring box includes a top plate 3 and a bottom plate 1 spaced apart in the vertical direction, and a side plate 2 is symmetrically arranged between the top plate 3 and the bottom plate 1, and the vertical plane where the side plate 2 is located is arranged parallel to the water flow direction. It can be seen that with regard to the overall structural design of the flow measuring box, there is no essential difference from the existing device.

[0042] The key point is that the first concave cavity 21, the second concave cavity 22 and the third concave cavity 23 are sequentially arranged on the inner side of the side plate 2 along the water flow direction, and the first concave cavity 21, the second concave cavity 22 and the third concave cavity 23 are arranged in multiple intervals along the vertical direction on the side plate 2, the purpose is to be able to detect the flow rate of the water flow at different heights, and then, the first concave cavity 21, the second concave cavity 22 and the third concave cavity 23 are all arranged in the first concave cavity 21, the second concave cavity 22 and the third concave cavity 23. After the flow measuring mechanism 5 is set, it can be coordinated with other flow measuring mechanisms 5 under the current height horizontal plane to achieve the measurement of the current height water flow velocity; it should be specially noted that as a preferred solution, on the same horizontal plane, the number of ultrasonic transducers 51 is 0 or 6, that is to say, the above-mentioned first concave cavity 21, the second concave cavity 22 and the third concave cavity 23 are arranged at intervals along the height direction, and they also need to be arranged in coordination, that is, on the same horizontal plane, when the first concave cavity 21 is set, the second concave cavity 22 and the third concave cavity 23 need to be synchronously set to ensure that the coordination between the flow measuring mechanisms 5 can be achieved.

[0043] Since there are a large number of flow measuring mechanisms 5, in order to avoid the problem that the entire flow measuring box cannot be used normally due to a problem with a single flow measuring mechanism 5, the flow measuring mechanism 5 needs to be set as a convenient detachable structure, such as Figure 8 As shown, the flow measuring mechanism 5 includes a mounting plate 52 detachably connected to the first concave cavity 21, the second concave cavity 22 or the third concave cavity 23. The mounting plate 52 is L-shaped, and the vertical surface is directly fixed to the side plate 2 by a hexagon socket bolt, and the horizontal surface is fixed to the ultrasonic transducer 51 by a hexagon socket bolt. Therefore, when in use, it can be removed from the side plate 2, and then the ultrasonic transducer 51 can be removed and replaced. For insulation considerations, the above-mentioned ultrasonic transducer 51 can be provided with a sealed shell, and only the wires are arranged to pass through the above-mentioned sealed shell for convenient wiring.

[0044] like Figure 3As shown, it should be noted that the ultrasonic transducer 51 located in the first concave cavity 21 is arranged opposite to the ultrasonic transducer 51 in the third concave cavity 23 of the opposite side plate 2, that is, the ultrasonic transducer 51 of the existing flow measuring box is arranged in the same manner, that is, a cross-beam arrangement. However, the characteristic different from the existing flow measuring box is that the second concave cavity 22 is located between the first concave cavity 21 and the third concave cavity 23, and the ultrasonic transducer 51 in the second concave cavity 22 is arranged opposite to the ultrasonic transducer 51 in the second concave cavity 22 of the opposite side plate 2. When in use, the transmission signal of the ultrasonic transducer 51 It is fan-shaped, so it can be transmitted to the ultrasonic transducers 51 on both sides, and can also receive signals from the ultrasonic transducers 51 on both sides, namely the first cavity 21 and the second cavity 22. Therefore, it has more options compared to the existing flow measuring box. However, it is limited by the non-reflective design. Although the signals of the ultrasonic transducers 51 in the second cavity 22 and the first cavity 21 and the third cavity 23 of the opposite side plate 2 are closer, the signals are still relatively weak compared to the reverse arrangement. Therefore, other components need to be set to amplify the signals to ensure that the flow velocity detection can be carried out normally.

[0045] like Figure 3 As shown, the first cavity 21 and the third cavity 23 are respectively located at one end of the side plate 2 close to the water inlet and the other end of the side plate 2 close to the water outlet. The angle between the first cavity 21 and the third cavity 23 and the second cavity 22 of the opposite side plate 2 is less than or equal to 90°. This prevents the ultrasonic transducer 51 at the second cavity 22 from sending out a signal that is not received and fed back by the ultrasonic transducers 51 at the first cavity 21 and the third cavity 23.

[0046] It should be noted that, in the above structure, there is no shielding object 6 between any ultrasonic transducer 51 and the ultrasonic transducer 51 of the opposite side plate 2, so as to avoid the intervention of other media and the influence on the normal flow velocity detection.

[0047] Finally, in order to obtain a flow rate that is not affected by obstructions, such as Figure 5 , 8 As shown, a partition 4 is horizontally arranged between the bottom plate 1 and the top plate 3, and the height of the partition 4 is located between any two third concave cavities 23 of the same side plate 2. As shown in the applicable condition limitation of the present invention, when an obstruction (such as silt or stone) appears at a position lower than the height of the partition 4, it will only affect the water flow at the position below, and will basically not affect the water flow at the position above the partition 4. Even if it does, it is very weak, so there is no need to consider the error caused by this problem.

[0048] And in the above structure, further, in order to avoid interference of the partition 4 with the first cavity 21 and the second cavity 22, the front end of the partition 4 and the end of the second cavity 22 close to the water outlet of the side plate 2 are located in the same vertical plane, and the end of the partition 4 is flush with one end of the water outlet of the side plate 2.

[0049] Therefore, based on the above structure, the effect that can be achieved is that, different from the existing symmetrical arrangement of the front and rear sides, an ultrasonic transducer 51 is also arranged in the middle position, and the ultrasonic transducer 51 at this position can feed back the signal of the ultrasonic transducers 51 at the two end positions. In addition, the ultrasonic transducer 51 arranged above the partition 4 can be less affected after the bottom plate 1 is generated with silt, and will not cause a large error.

[0050] Afterwards, with respect to the usage of the above structure, a box-type ultrasonic open channel flow measurement method is also disclosed simultaneously, using the above box-type ultrasonic open channel flow measurement system, and comprising the following steps:

[0051] Step 1, construct a standard model: set the flow box to be tested in a water channel that can control the flow rate of the liquid, trigger the ultrasonic transducer 51 at the first cavity 21, and after the ultrasonic transducer 51 in the second cavity 22 receives the ultrasonic signal, trigger the ultrasonic transducer 51 in the second cavity 22 and feed it back to the ultrasonic transducer 51 at the first cavity 21, and the control terminal calculates the first flow rate value. Under ideal conditions without obstructions 6, the first flow rate value or the second flow rate value can be used in conjunction with the electronic water level set in the flow measuring box to calculate the liquid flow rate. After the ultrasonic transducer 51 in the third cavity 23 below the horizontal plane where the partition 4 is located receives the signal from the ultrasonic transducer 51 in the first cavity 21, it feeds back to the ultrasonic transducer 51 in the first cavity 21, and the control terminal calculates the second flow rate value. The ultrasonic transducer 51 in the third cavity 23 above the horizontal plane where the partition 4 is located receives the ultrasonic transducer 51 in the third cavity 23 above the horizontal plane where the partition 4 is located. After the signal of the ultrasonic transducer 51 at the first concave cavity 21 is fed back to the ultrasonic transducer 51 at the first concave cavity 21, the control terminal calculates the third flow velocity value, after the ultrasonic transducer 51 in the third concave cavity 23 below the horizontal plane where the partition 4 is located receives the signal of the ultrasonic transducer 51 at the second concave cavity 22, the ultrasonic transducer 51 is fed back to the ultrasonic transducer 51 at the second concave cavity 22, the control terminal calculates the fourth flow velocity value, after the ultrasonic transducer 51 in the third concave cavity 23 above the horizontal plane where the partition 4 is located receives the signal of the ultrasonic transducer 51 at the second concave cavity 22, the ultrasonic transducer 51 is fed back to the ultrasonic transducer 51 at the second concave cavity 22, the control terminal calculates the fifth flow velocity value, by changing the initial flow velocity of the water channel, all subsequent flow velocity values ​​can be changed, so the first flow velocity value, the second flow velocity value, the third flow velocity value, the fourth flow velocity value, and the fifth flow velocity value under different initial flow velocities can be obtained respectively;

[0052] Step 2, establishing a standard database: The standard database refers to establishing a database of the first flow rate value, the second flow rate value, the third flow rate value, the fourth flow rate value and the fifth flow rate value at different initial flow rates without interference from the obstruction 6, so as to facilitate subsequent comparison and judgment of various situations;

[0053] Step three, judging whether there is an obstruction 6: setting the flow box to be tested in the canal of the application scenario, obtaining the first flow velocity value, the second flow velocity value, the fourth flow velocity value and the fifth flow velocity value of the flow box to be tested. First of all, regardless of whether there is an obstruction 6, the fifth flow velocity value will not be affected. Therefore, the first flow velocity value, the second flow velocity value, the fourth flow velocity value and the fifth flow velocity value corresponding to the initial flow velocity in the standard database are respectively subtracted. If the difference is within the set threshold range, it is judged that there is no obstruction 6. If the difference is not within the set threshold range, it is judged that there is an obstruction 6. It should be noted that the fifth flow velocity value is set as the initial flow velocity, that is, it is necessary to first subtract the obtained fifth flow velocity value from the fifth flow velocity value corresponding to the database, and only when the difference is 0 can the current data be selected, and the differences between the first flow velocity value, the second flow velocity value and the fourth flow velocity value and the corresponding group in the database are calculated in turn.

[0054] Exceeding the threshold interval means that under the same fifth flow velocity value, other flow velocity values ​​have large changes, which means that there must be a situation that does not correspond to the ideal state, that is, the silt-free state, which means that there are other media, that is, the obstruction 6.

[0055] Through the above-mentioned method, it is possible to detect whether there is an obstruction 6, and then after setting up an alarm mechanism, the staff can be notified in time to clear the obstruction 6.

[0056] In the above method, the way to determine the position of the front section obstruction 6 is that in step 3, the first flow velocity value, the third flow velocity value and the fifth flow velocity value of the flow box to be detected are obtained, and the difference is made with the first flow velocity value, the third flow velocity value and the fifth flow velocity value corresponding to the initial flow velocity in the standard database, respectively. If the difference is not within the set threshold range, it is determined that there is a front section obstruction 6 of the flow box. The first flow velocity value is the value calculated after the ultrasonic transducer 51 in the first concave cavity 21 is triggered, and the ultrasonic transducer 51 in the second concave cavity 22 receives the ultrasonic signal, triggers the ultrasonic transducer 51 in the second concave cavity 22 and feeds back to the ultrasonic transducer 51 in the first concave cavity 21, so there must be a medium here.

[0057] The same as the above method, the method for determining the position of the middle section obstruction 6 is that in step 3, the second flow velocity value, the third flow velocity value and the fifth flow velocity value of the flow box to be detected are obtained, and the second flow velocity value, the third flow velocity value and the fifth flow velocity value corresponding to the initial flow velocity in the standard database are respectively subtracted. If the difference is not within the set threshold range, it is determined that there is a middle section obstruction 6 of the flow box. The above steps can be used by analogy, and the relevant method will not be repeated.

[0058] The method for determining the position of the rear-end obstruction 6 is as follows: in step three, the third flow velocity value, the fourth flow velocity value and the fifth flow velocity value of the flow box to be detected are obtained, and they are respectively subtracted from the third flow velocity value, the fourth flow velocity value and the fifth flow velocity value corresponding to the initial flow velocity in the standard database; if the difference is not within the set threshold range, it is determined that there is an obstruction 6 at the rear end of the flow box.

[0059] Finally, in order to estimate the rough flow rate value when the obstruction 6 appears, the step 4, rough flow rate value estimation, is also included, and the first flow rate value or the second flow rate value information is determined from the database information according to the fifth flow rate value, and the first flow rate value or the second flow rate value is a rough flow rate value. Although there is a certain error in the value compared to the case where there is no obstruction 6, the error is smaller than the first flow rate value detected directly when the obstruction 6 exists.

Claims

1. Box-type ultrasonic open channel flow measurement system, characterized in that: It includes a control terminal and a current measuring box electrically connected to the control terminal; The flow measuring box comprises a top plate and a bottom plate arranged at intervals in the vertical direction, and a side plate is symmetrically arranged between the top plate and the bottom plate, the vertical plane where the side plate is located is arranged parallel to the water flow direction, and the inner side surface of the side plate is sequentially arranged with a first concave cavity, a second concave cavity and a third concave cavity along the water flow direction, and a plurality of the first concave cavity, the second concave cavity and the third concave cavity are arranged at intervals in the side plate along the vertical direction, and a flow measuring mechanism is arranged in each of the first concave cavity, the second concave cavity and the third concave cavity; The flow measuring mechanism comprises a mounting plate detachably connected to the first concave cavity, the second concave cavity or the third concave cavity, and an ultrasonic transducer is arranged above the mounting plate; The ultrasonic transducer in the first concave cavity is arranged opposite to the ultrasonic transducer in the third concave cavity of the opposite side plate, the second concave cavity is located between the first concave cavity and the third concave cavity, and the ultrasonic transducer in the second concave cavity is arranged opposite to the ultrasonic transducer in the second concave cavity of the opposite side plate; There is no shielding between any ultrasonic transducer and the ultrasonic transducer of the opposite side panel; A partition is horizontally arranged between the bottom plate and the top plate, and the height of the partition is located between any two third concave cavities of the same side plate.

2. The box-type ultrasonic open channel flow measurement system according to claim 1 is characterized in that: On the same horizontal plane, the number of ultrasonic transducers is 0 or 6.

3. The box-type ultrasonic open channel flow measurement system according to claim 1 is characterized in that: The first concave cavity and the third concave cavity are respectively located at one end of the side plate close to the water inlet and one end of the side plate close to the water outlet.

4. The box-type ultrasonic open channel flow measurement system according to claim 1 is characterized in that: The front end of the partition plate and one end of the second cavity close to the water flow outlet of the side plate are located in the same vertical plane, and the rear end of the partition plate is flush with one end of the water flow outlet of the side plate.

5. Box-type ultrasonic open channel flow measurement method, characterized in that: The above-mentioned box-type ultrasonic open channel flow measurement system is used and includes the following steps: Step 1, build a standard model: set the flow box to be tested in a water channel that can control the flow rate of the liquid, trigger the ultrasonic transducer at the first cavity, and after the ultrasonic transducer in the second cavity receives the ultrasonic signal, trigger the ultrasonic transducer in the second cavity and feed it back to the ultrasonic transducer at the first cavity. The control terminal calculates the first flow rate value. After the ultrasonic transducer in the third cavity below the horizontal plane where the partition is located receives the signal of the ultrasonic transducer at the first cavity, it feeds back to the ultrasonic transducer at the first cavity. The control terminal calculates the second flow rate value. After the ultrasonic transducer in the third cavity above the horizontal plane where the partition is located receives the signal of the ultrasonic transducer at the first cavity, it feeds back To the ultrasonic transducer at the first concave cavity, the control terminal calculates the third flow velocity value, the ultrasonic transducer in the third concave cavity below the horizontal plane where the partition is located receives the signal of the ultrasonic transducer at the second concave cavity, and then feeds back to the ultrasonic transducer at the second concave cavity, and the control terminal calculates the fourth flow velocity value, the ultrasonic transducer in the third concave cavity above the horizontal plane where the partition is located receives the signal of the ultrasonic transducer at the second concave cavity, and then feeds back to the ultrasonic transducer at the second concave cavity, and the control terminal calculates the fifth flow velocity value, and when the initial flow velocity of the water channel is changed, the first flow velocity value, the second flow velocity value, the third flow velocity value, the fourth flow velocity value, and the fifth flow velocity value under different initial flow velocities are obtained respectively; Step 2, establishing a standard database: establishing a database with the first flow rate value, the second flow rate value, the third flow rate value, the fourth flow rate value and the fifth flow rate value at different initial flow rates; Step 3, judging whether there is an obstruction: the flow box to be detected is set in the water channel of the application scenario, and the first flow velocity value, the second flow velocity value, the fourth flow velocity value and the fifth flow velocity value of the flow box to be detected are obtained, and the first flow velocity value, the second flow velocity value, the fourth flow velocity value and the fifth flow velocity value corresponding to the initial flow velocity in the standard database are respectively subtracted. If the difference is within the set threshold range, it is judged that there is no obstruction; if the difference is not within the set threshold range, it is judged that there is an obstruction; Set the fifth flow rate value as the initial flow rate.

6. The box-type ultrasonic open channel flow measurement method according to claim 5 is characterized in that: The method further includes step 4, calculating a rough flow rate value, determining the first flow rate value or the second flow rate value information from the database information according to the fifth flow rate value, and the first flow rate value or the second flow rate value is a rough flow rate value.

7. The box-type ultrasonic open channel flow measurement method according to claim 6 is characterized in that: In step three, the first flow rate value, the third flow rate value and the fifth flow rate value of the flow box to be tested are obtained, and they are respectively subtracted from the first flow rate value, the third flow rate value and the fifth flow rate value corresponding to the initial flow rate in the standard database. If the difference is not within the set threshold range, it is determined that there is an obstruction in the front section of the flow box.

8. The box-type ultrasonic open channel flow measurement method according to claim 6 is characterized in that: In step three, the second flow rate value, the third flow rate value and the fifth flow rate value of the flow box to be tested are obtained, and they are subtracted from the second flow rate value, the third flow rate value and the fifth flow rate value corresponding to the initial flow rate in the standard database. If the difference is not within the set threshold range, it is determined that there is an obstruction in the middle section of the flow box.

9. The box-type ultrasonic open channel flow measurement method according to claim 6, characterized in that: In step three, the third flow rate value, the fourth flow rate value and the fifth flow rate value of the flow box to be tested are obtained, and they are respectively subtracted from the third flow rate value, the fourth flow rate value and the fifth flow rate value corresponding to the initial flow rate in the standard database. If the difference is not within the set threshold range, it is determined that there is an obstruction in the rear section of the flow box.

Images