Rectification structure and ultrasonic measuring device

Abstract

The present invention belongs to the field of ultrasonic measurement technology, and particularly relates to a rectifier structure, including a rectifier, a reducing tube, and a bracket, wherein one end of the bracket is sleeved on the end of the reducing tube and sealed; the rectifier has an installation section and a diverter section connected at the ends, the diverter section is inserted into the interior of the bracket, the installation section is installed and matched with the bracket, a plurality of circumferentially distributed diverter plates are arranged on the inner wall of the installation section, the diverter plates radially extend to the coverage range of the diverter section, a rectifier hole is arranged between two adjacent diverter plates located within the coverage range of the diverter section, and a plugging piece is arranged at the end of the diverter section away from the installation section to form a sealed end. One end of the rectifier is arranged as the fluid inlet side, and one end of the reducing tube is arranged as the outlet side. After the fluid is rectified once by the rectifier, it enters the reducing tube through the bracket for secondary rectification, thereby eliminating the unstable state in the fluid. When the fluid flow rate is ultrasonically measured, the ultrasonic path passes through the center of the fluid flow rate, thereby improving the flow rate measurement accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic measurement, and in particular relates to a rectification structure and an ultrasonic measurement device. Background Art

[0002] Ultrasonic water meters are increasingly used in the field of water metering due to their characteristics of no moving parts and no pressure loss. Ultrasonic water meters based on electrical or electronic principles have gradually replaced some of the original insertion flow meters and mechanical water meters. These electronic water meters have incomparable advantages in terms of intelligence compared to traditional mechanical water meters, and have almost no pressure loss.

[0003] A reflector, straight tube or reflector bracket needs to be installed in the ultrasonic water meter. The ultrasonic wave is reflected by the reflector through the fluid to be measured, and the time difference between the forward and reverse paths is calculated to infer the flow rate information. When the measured fluid is subject to some disturbance, the flow rate center will be offset, such as the vortex disturbance or velocity profile disturbance specified in the water meter standard. If the ultrasonic wave path reflected by the reflector does not pass through the fluid flow rate center, the measured data will be distorted, causing measurement errors of the water meter. Summary of the invention

[0004] The present invention aims at solving the problems in the prior art and proposes the following technical solutions:

[0005] The rectifier structure includes a rectifier, a reducing tube, and a bracket, wherein one end of the bracket is sleeved on the end of the reducing tube for sealing;

[0006] The rectifier comprises a mounting section and a diverter section connected at the ends, the diverter section is inserted into the interior of the bracket, the mounting section is installed and matched with the bracket, a plurality of circumferentially distributed diverter sheets are arranged on the inner wall of the mounting section, the diverter sheets radially extend to the coverage range of the diverter section, a rectifier hole is arranged between two adjacent diverter sheets located within the coverage range of the diverter section, and a plugging piece is arranged at the end of the diverter section away from the mounting section to form a sealed end;

[0007] The two ends of the reducing tube are arranged as expanding openings, and rectifying pieces are arranged at the expanding openings; wherein, the fluid is diverted by the diverting piece, intercepted by the sealing end, and then flows out from the rectifying hole to complete the primary rectification, and the fluid completes the secondary rectification through the expanding opening and the rectifying piece.

[0008] As a preferred embodiment of the above technical solution, the end radius of the diverter section connecting the installation section is larger than the end radius of the sealing end, the middle part of the diverter section adopts an arc transition, and the sealing end of the diverter section radially extends to form a tubular buffer section.

[0009] As a preferred embodiment of the above technical solution, the sealing end has an end bevel.

[0010] As a preferred embodiment of the above technical solution, the shortest length of the buffer segment is 3 cm-5 cm, and the angle of the end slope is 30°-60°.

[0011] As a preferred embodiment of the above technical solution, the side of the diverter plate away from the diverter section is set to be an arc chamfer, and the expanded opening is a trumpet shape with an arc transition.

[0012] As a preferred embodiment of the above technical solution, both ends of the bracket are provided with pin grooves, the rectifier is provided with a pin block 1, and the reducing tube is provided with a pin block 2, and the pin block 1 and the pin block 2 are matched with the pin grooves at both ends of the bracket respectively.

[0013] The ultrasonic measuring device comprises a tube body and the above-mentioned rectifying structure arranged inside the tube body, wherein a mounting hole is provided through the tube body, and an ultrasonic sensor is installed in the mounting hole;

[0014] Another bracket is arranged at the movable end of the reducing tube, and reflective sheets are arranged obliquely in both brackets. Through holes are arranged at the positions of the brackets corresponding to the mounting holes, and the reflective sheets are located within the coverage range of the through holes.

[0015] As a preferred embodiment of the above technical solution, the reflector sheet close to the rectifier is configured as a blocking piece, the back side of the reflector sheet is in close contact with the end bevel, and the end bevel, the reflector sheet and the water inlet of the reducing pipe have the same shape.

[0016] As a preferred embodiment of the above technical solution, two mounting holes are correspondingly opened on the side wall of the bracket, and both ends of the reflective sheet are extended to form mounting ears that are plugged into and matched with the mounting holes.

[0017] As a preferred embodiment of the above technical solution, a positioning hole is provided on the reducing tube, a raised positioning column cooperating with the positioning hole is provided on the inner wall of the tube body, and a circumferentially arranged groove is provided on the outer side of the reducing tube, and a sealing ring is provided in the groove to seal the gap between the tube body and the reducing tube.

[0018] The beneficial effects of the present invention are:

[0019] 1. In the technical solution of the rectifier structure, one end of the rectifier is set as the fluid inlet side, and one end of the reduced diameter pipe is set as the outlet side. The fluid is first rectified by the rectifier and then enters the reduced diameter pipe through the bracket for secondary rectification to eliminate the unstable state in the fluid. When the fluid flow rate is ultrasonically measured, the ultrasonic path passes through the center of the fluid flow rate, thereby improving the flow rate measurement accuracy;

[0020] 2. In the technical solution of this ultrasonic measuring device, the rectifier structure and the measuring component are integrated inside the tube body. The entire structure only includes a rectifier, a reducing tube, two brackets, and two reflectors, which solves the problems of complex and diverse structures, large pressure loss, and high cost in the prior art;

[0021] Before the measuring component completes the measurement of the fluid flow rate, the fluid is first rectified by the rectifier and then rectified for a second time by the reducing tube to eliminate the unstable state of the fluid. When the fluid is measured by the measuring component, the ultrasonic path approaches the flow center of the fluid, thereby improving the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 What is shown is a cross-sectional schematic diagram of the rectification structure in this embodiment;

[0023] Among them, the rectifier, the reduced diameter tube, and the bracket in the figure constitute a rectifier structure;

[0024] Figure 2 It shows Figure 1 Exploded diagram of the rectifier structure;

[0025] Figure 3 It shows Figure 1 Schematic diagram of the structure of the rectifier;

[0026] Figure 4 It shows Figure 3 A cross-sectional enlarged schematic diagram of a rectifier in FIG.

[0027] Figure 5 It shows Figure 1 Schematic diagram of the structure of the middle reducer;

[0028] Figure 6 It shows Figure 5 Schematic diagram of the cross-sectional view of the reduced diameter pipe in;

[0029] Figure 7 Shown is a schematic diagram of the internal structure of an ultrasonic measuring device;

[0030] Figure 8 It shows Figure 7 Schematic diagram of the explosion of the internal structure of the tube of the ultrasonic measuring device;

[0031] Figure numerals: tube body 1, rectifier 2, mounting section 21, shunt section 22, rectifier hole 23, shunt plate 24, buffer section 26, end bevel 25, reducing tube 3, positioning hole 31, expanding opening 32, rectifier plate 33, groove 34, bracket 4, reflector 5, mounting hole 7. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0033] like Figure 1 , Figure 2 As shown, the rectifier structure includes a rectifier 2, a reducing tube 3, and a bracket 4. One end of the bracket 4 is sleeved on the end of the reducing tube 3 and sealed. In order to solve the problem of movable assembly of the rectifier 2, the reducing tube 3, and the bracket 4, both ends of the bracket 4 are provided with latch grooves, the rectifier 2 is provided with a latch block 1, and the reducing tube 3 is provided with a latch block 2. The latch block 1 and the latch block 2 are matched with the latch grooves at both ends of the bracket 4 respectively. The assembly method is simple and the relative position accuracy of the assembly is high.

[0034] like Figure 3 , Figure 4 As shown, the rectifier 2 has a mounting section 21 and a diverter section 22 connected at the ends, the diverter section 22 is inserted into the interior of the bracket 4, the mounting section 21 is installed and matched with the bracket 4, and a plurality of circumferentially distributed diverter sheets 24 are arranged on the inner wall of the mounting section 21, the diverter sheets 24 radially extend to the coverage range of the diverter section 22, and the side of the diverter sheet 24 away from the diverter section 22 is arranged as an arc chamfer, and the arc-shaped guide portion formed facilitates the entry of the fluid and reduces the pressure loss; a rectifier hole 23 is arranged between two adjacent diverter sheets 24 located within the coverage range of the diverter section 22, and a plugging piece is arranged at the end of the diverter section 22 away from the mounting section 21 to form a sealed end;

[0035] like Figure 5 , Figure 6 As shown, both ends of the reducing tube 3 are arranged as expanding openings 32, and the expanding openings 32 are in the shape of a trumpet with a circular arc transition, so as to reduce the impact force when the fluid enters the reducing tube 3, and make the fluid state area stable, and a rectifying piece 33 is arranged at the expanding opening 32; wherein, the fluid is diverted by the diverter piece 24, intercepted by the sealing end, and then flows out from the rectifying hole 23 to complete the primary rectification, and the fluid completes the secondary rectification through the expanding opening 32 and the rectifying piece 33.

[0036] In the technical solution of the rectification structure, one end of the rectifier 2 is set as the fluid inlet side, and one end of the reducing tube 3 is set as the outlet side. The fluid is first rectified by the rectifier 2, and then enters the reducing tube 3 through the bracket 4 for secondary rectification to eliminate the unstable state in the fluid. When the fluid flow rate is ultrasonically measured, the ultrasonic path passes through the center of the fluid flow rate, thereby improving the flow rate measurement accuracy.

[0037] In the rectifier 2, the mounting section 21 is the fluid inlet end, which is installed and matched with the bracket 4, and the diverter section 22 is the fluid outlet end. During the flow of the fluid, it is first diverted by the diverter plate 24 and intercepted by the sealing end of the rectifier 2, and then the direction of the fluid is changed and flows out from the rectifying hole 23; the diverter plate 24 breaks up the water flow, so that the water flow enters the rectifying hole 23 more smoothly and evenly. The setting of the diverter plate 24 divides one stream into multiple streams for diversion, and then converges into one stream through the rectifying hole 23, solving the flow velocity problem outside the fluid and making the external flow velocity tend to be stable; the setting of the sealing end intercepts the fluid, solves the problem that the flow velocity in the middle of the fluid is the largest, and slows down the fastest flow velocity in the middle of the fluid. In this process, the unstable state in the fluid is well eliminated, and a rectification is performed, and the rectification effect is good.

[0038] In the reducing tube 3, the expanding opening 32 is a trumpet shape with an arc transition, and a rectifying piece 33 is arranged at the expanding opening 32. The reducing tube 3 with this special structural design can make the fluid smoothly enter the reducing tube 3 from the bracket 4 and then transition to the velocity measuring tube section (the middle position of the reducing tube 3). The liquid flow velocity is smoothly transitioned, the turbulence is reduced, and thus a secondary rectification is formed.

[0039] like Figure 3 , Figure 4 As shown, the radius of the end where the diverter section 22 connects to the mounting section 21 is larger than the radius of the end of the sealing end. The middle of the diverter section 22 adopts an arc transition, and the sealing end of the diverter section 22 radially extends to form a tubular buffer section 26.

[0040] like Figure 3 , Figure 4 As shown, the end radius of the diverter section 22 connected to the mounting section 21 is larger than the end radius of the sealing end, and the middle part of the diverter section 22 adopts an arc-shaped transition setting, so that a travel space for the fluid to move is formed between the buffer section 26 and the bracket 4; the setting of the buffer section 26, during the movement of the fluid, a certain amount of fluid is stored inside the buffer section 26, reducing the impact force during the movement of the fluid, thereby reducing the flow rate of the fluid, allowing the fluid to move in a more stable state, and improving the rectification effect.

[0041] like Figure 3 , Figure 4 As shown, the sealing end has an end bevel 25, and the end bevel 25 is arranged upward;

[0042] After passing through the buffer section 26, the fluid contacts the end inclined surface 25, causing impact. Due to the inclined setting of the sealing end, the water impacting from the upper part has a tendency to move downward, further reducing the impact force of the fluid.

[0043] like Figure 3 , Figure 4 As shown, the shortest length of the buffer section 26 is 3 cm-5 cm, and the included angle of the end slope 25 is 30°-60°.

[0044] like Figure 7 , Figure 8 As shown, the ultrasonic measuring device comprises a tube body 1 and a rectifying structure arranged inside the tube body 1. A mounting hole 7 is provided through the tube body 1, and an ultrasonic sensor is installed in the mounting hole 7.

[0045] Another bracket 4 is provided at the movable end of the reducing tube 3, and reflective sheets 5 are obliquely provided inside the two brackets 4. The bracket 4 is injection-molded by non-metallic materials and installed in the tube body 1 together with the reflective sheet 5 as a measuring tube, which solves the inner diameter change of the metal tube caused by thermal expansion and contraction. A through hole is provided at the position of the bracket 4 corresponding to the mounting hole 7, and the reflective sheet 5 is located within the coverage range of the through hole.

[0046] In the technical solution of the ultrasonic measuring device, one end of the pipe body 1 provided with a rectifier 2 is the water inlet end, and the other end is the water outlet end. The ultrasonic wave emitted by the ultrasonic sensor of the water inlet section passes through the reflector 5 of the water inlet section, is reflected to the reflector 5 of the water outlet section, and then is emitted by the reflector 5 of the water outlet section to the ultrasonic sensor of the water outlet section, thereby completing the measurement of the water flow rate. The measuring assembly consisting of the ultrasonic sensor of the water inlet section, the reflector 5 of the water inlet section, the reflector 5 of the water outlet section, and the ultrasonic sensor of the water outlet section is connected in a U-shaped distribution.

[0047] In the technical solution of the ultrasonic measuring device, the rectifier structure and the measuring component are integrated inside the tube body 1, and the entire structure only includes a rectifier 2, a reducing tube 3, two brackets 4, and two reflectors 5, which solves the problems of complex and diverse structures, large pressure loss, and high cost in the prior art;

[0048] Before the measuring component completes the measurement of the fluid flow rate, the fluid is first rectified by the rectifier 2, and then the fluid is rectified for a second time by the reducing tube 3 to eliminate the unstable state of the fluid. When the fluid is measured by the measuring component, the ultrasonic path approaches the flow center of the fluid, thereby improving the accuracy of the measurement.

[0049] like Figure 7 , Figure 8 As shown, in order to reduce the use of components and reduce the space occupied, the reflective sheet 5 close to the rectifier 2 is set as a sealing piece, and the back of the reflective sheet 5 is tightly matched with the end bevel 25 to complete the sealing of the original water outlet of the rectifier 2. The end bevel 25, the reflective sheet 5, and the water inlet of the reducing tube 3 are consistent in shape, so that the fluid is diverted by the diverter sheet 24 and then flows out through the rectifying hole 23, effectively making the fluid smoothly transition in the process of entering the reducing tube 3 through the rectifying hole 23.

[0050] like Figure 7 , Figure 8As shown, in order to facilitate the installation of the reflector 5, two installation holes are correspondingly opened on the side wall of the bracket 4, and both ends of the reflector 5 are extended to form installation ears that are plugged into the installation holes.

[0051] like Figure 7 , Figure 8 As shown, in order to facilitate installation and ensure the test accuracy of the fluid flow rate after installation, a positioning hole 31 is provided on the reducer 3, and the inner wall of the tube body 1 is provided with a raised positioning column that cooperates with the positioning hole 31; in order to ensure the sealing between the tube body 1 and the reducer 3, and to ensure the test accuracy of the fluid flow rate after installation, the outer side of the reducer 3 has a circumferentially arranged groove 34, and a sealing ring is provided in the groove 34 to block the gap between the tube body 1 and the reducer 3 to prevent the fluid from passing between the tube body 1 and the reducer 3.

[0052] Example 1

[0053] In the ultrasonic measuring device of this embodiment, the rectifier 2 has a mounting section 21, a diverter section 22 with a sealed end, a rectifying hole 23, a diverter plate 24, a buffer section 26 with a length of 0 cm, that is, there is no buffer section 26, and an end bevel 25 with an angle of 90°, that is, there is no end bevel 25.

[0054] Example 2

[0055] In the ultrasonic measuring device of this embodiment, the rectifier 2 has a mounting section 21, a diverter section 22 with a sealed end, a rectifying hole 23, a diverter sheet 24, a buffer section 26 with a length of 2 cm, and an end bevel 25 with an angle of 90°, that is, it does not have an end bevel 25.

[0056] Example 3

[0057] In the ultrasonic measuring device of this embodiment, the rectifier 2 has a mounting section 21, a diverter section 22 with a sealed end, a rectifying hole 23, a diverter sheet 24, a buffer section 26 with a length of 3 cm, and an end bevel 25 with an angle of 60°.

[0058] Example 4

[0059] In the ultrasonic measuring device of this embodiment, the rectifier 2 has a mounting section 21, a diverter section 22 with a sealed end, a rectifying hole 23, a diverter sheet 24, a buffer section 26 with a length of 4 cm, and an end bevel 25 with an angle of 45°.

[0060] Example 5

[0061] In the ultrasonic measuring device of this embodiment, the rectifier 2 has a mounting section 21, a diverter section 22 with a sealed end, a rectifying hole 23, a diverter sheet 24, a buffer section 26 with a length of 5 cm, and an end bevel 25 with an angle of 30°.

[0062] Example 6

[0063] In the ultrasonic measuring device of this embodiment, the rectifier 2 has a mounting section 21, a diverter section 22 with a sealed end, a rectifying hole 23, a diverter sheet 24, a buffer section 26 with a length of 6 cm, and an end bevel 25 with an angle of 75°.

[0064] Example 7

[0065] In the ultrasonic measuring device of this embodiment, the rectifier 2 has a mounting section 21, a diverter section 22 with a sealed end, a rectifying hole 23, a diverter sheet 24, a buffer section 26 with a length of 5 cm, and an end bevel 25 with an angle of 15°.

[0066] Comparative Example 1

[0067] The ultrasonic measuring device in this embodiment adopts a rectifier in the prior art, such as a mesh or grid rectifier in the authorization announcement number CN218973547 U.

[0068] Comparative Example 2

[0069] The measuring device in this embodiment adopts a traditional mechanical water meter, such as a piston water meter.

[0070] Based on Examples 1-7 and Comparative Examples 1-2, the measuring devices described in Examples 1-2 are used in water pipes with the same diameter, such as 4 inches, to test the flow rate of the fluid, while ensuring that the water temperature, pressure, flow direction, flow rate are set to 2m / s, and the water quality and other influencing parameters are the same; each device measures the flow rate five times to obtain the standard deviation.

[0071]

[0072] It can be seen from Examples 1 to 7, Comparative Examples 1 to 2 and Table 1 that the measurement error of Comparative Example 2 reaches 0.5%, the measurement error of Comparative Example 1 reaches 0.25%, and the error of the ultrasonic measuring device using the rectifier structure of the present application can be controlled below 0.2%; this indicates that the ultrasonic measuring device using the rectifier structure of the present application has a smaller error than that of Comparative Examples 1 to 2 when measuring water velocity.

[0073] It can be seen from the results of the five speed measurements that the standard deviations of the five speed measurement results of the embodiment of the present application are all below 0.00001000, indicating that when the ultrasonic measuring device of the embodiment of the present application is used to measure the flow rate, the flow velocity fluctuation of the water after passing through the rectifier is small and the flow velocity is relatively stable; while the standard deviations of the five speed measurements of comparative examples 1 to 2 are above 0.00001000, and comparative example 2 even reaches 0.00006120. Therefore, it can be seen that the ultrasonic measuring device using the rectifier structure of the present application is very stable when measuring water velocity.

[0074] It can be seen from Example 1, Examples 2 to 7 and Table 1 that there is no buffer section in the rectification structure in Example 1 of the present application. From the results of five speed measurements, it can be seen that each measurement value is higher. Therefore, it can be seen that when the ultrasonic measuring device in Example 1 is used to measure the speed of water flow, the measured value will be slightly higher than the actual value; but from the standard deviation of the five measurement values, it can be seen that there is no buffer section structure in Example 1, and the measurement result is relatively stable.

[0075] It can be seen from Examples 3 to 5, Examples 1 to 2, Examples 6 to 7 and Table 1 that the error in measuring speed using the ultrasonic measuring device in Examples 3 to 5 is small, and the fluctuation of the measured values ​​of multiple measurements is small.

[0076] It can be seen from Example 5 and Table 1 that when the ultrasonic measuring device in Example 5 is used for measurement, the measurement error is less than 0.1%, and the standard deviation of the five measurement values ​​is 0.00000080, indicating that when the ultrasonic measuring device in Example 5 is used for measurement, the error is relatively smaller, the fluctuation of the measurement value is small, and it is more accurate.

[0077] In summary, the measuring accuracy of the measuring device in the technical scheme of the present application is greater than the measuring accuracy of the measuring device in the prior art, and the rectifying effect of the rectifier 2 in the technical scheme of the present application is better than the rectifying effect of the rectifier in the prior art; at the same time, it can be seen that the length of the buffer section 26 of the rectifier 2 in the present application is preferably in the range of 3-5 cm, and the angle of the end bevel 25 is preferably in the range of 30°-60°.

[0078] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A rectifier structure, comprising a rectifier (2), a reducing tube (3), and a bracket (4), characterized in that: One end of the bracket (4) is sleeved on the end of the reducing tube (3) to seal; The rectifier (2) comprises a mounting section (21) and a flow dividing section (22) connected at the ends, the flow dividing section (22) being inserted into the interior of the bracket (4), the mounting section (21) being mounted and matched with the bracket (4), the inner wall of the mounting section (21) being provided with a plurality of circumferentially distributed flow dividing sheets (24), the flow dividing sheets (24) radially extending into the coverage range of the flow dividing section (22), a flow dividing hole (23) being provided between two adjacent flow dividing sheets (24) located within the coverage range of the flow dividing section (22), and a sealing piece being provided at the end of the flow dividing section (22) away from the mounting section (21) to form a sealed end; Both ends of the reduced diameter tube (3) are provided with expanded diameter openings (32), and rectifying pieces (33) are provided at the expanded diameter openings (32); wherein the fluid is diverted by the diverting piece (24), intercepted by the sealing end, and flows out from the rectifying hole (23) to complete primary rectification, and the fluid is diverted by the expanded diameter opening (32) and the rectifying piece (33) to complete secondary rectification; The radius of the end portion where the diverter section (22) is connected to the mounting section (21) is greater than the radius of the end portion of the sealing end; the middle portion of the diverter section (22) adopts an arc transition; and the sealing end of the diverter section (22) radially extends to form a tubular buffer section (26); The sealing end has an end bevel (25); The shortest length of the buffer section (26) is 3 cm to 5 cm, and the included angle of the end inclined surface (25) is 30° to 60°.

2. The rectifying structure according to claim 1, characterized in that: The side of the diverter sheet (24) away from the diverter section (22) is arranged as an arc chamfer, and the expanded opening (32) is in the shape of a trumpet with an arc transition.

3. The rectifying structure according to claim 1, characterized in that: Both ends of the bracket (4) are provided with latch slots, the rectifier (2) is provided with a latch block 1, and the reducing tube (3) is provided with a latch block 2, and the latch block 1 and the latch block 2 are matched with the latch slots at both ends of the bracket (4) respectively.

4. An ultrasonic measuring device, characterized in that Comprising a tube body (1), and a rectifying structure according to any one of claims 1 to 3 arranged inside the tube body (1), wherein a mounting hole (7) is provided through the tube body (1), and an ultrasonic sensor is installed in the mounting hole (7); Another bracket (4) is provided at the movable end of the reduced diameter tube (3), and a reflective sheet (5) is obliquely provided in each of the two brackets (4). A through hole is provided at a position of the bracket (4) corresponding to the mounting hole (7), and the reflective sheet (5) is located within the coverage range of the through hole.

5. The ultrasonic measuring device according to claim 4, characterized in that: The reflective sheet (5) close to the rectifier (2) is used as a plugging piece, the back side of the reflective sheet (5) is in close contact with the end inclined surface (25), and the end inclined surface (25), the reflective sheet (5), and the water inlet of the reduced diameter pipe (3) are of the same shape.

6. The ultrasonic measuring device according to claim 4, characterized in that: Two mounting holes are correspondingly provided on the side wall of the bracket (4), and both ends of the reflective sheet (5) extend to form mounting ears that are plugged into and fit with the mounting holes.

7. The ultrasonic measuring device according to claim 4, characterized in that: The reducing tube (3) is provided with a positioning hole (31), the inner wall of the tube body (1) is provided with a raised positioning column that cooperates with the positioning hole (31), the outer side of the reducing tube (3) has a circumferentially arranged groove (34), and a sealing ring is provided in the groove (34) to seal the gap between the tube body (1) and the reducing tube (3).

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