Self-cleaning dual venturi flowmeter and method of detecting same

Abstract

The application discloses a self-cleaning double Venturi flowmeter and a detection method thereof, and belongs to the technical field of flowmeters and detection methods thereof. The self-cleaning double Venturi flowmeter comprises a contraction end and an expansion end on a pipeline, and the contraction end and the expansion end are connected through a throat end. A guiding cleaning mechanism comprises a rotating shaft installed on the pipeline, one end of the rotating shaft is fixedly connected to a first handle, and the opposite end extends to an annular baffle on the inner wall center of the pipeline. Arc-shaped blocks on the outer ends of the annular baffle are arranged on a pushing rod. The arc-shaped blocks are provided with round corners close to the liquid flow direction, and the arc-shaped blocks are provided with curved surfaces in contact with the annular baffle. The application can solve the technical problem that the internal pipeline is usually provided with a fixed mechanism, the internal pipeline cannot be adaptively adjusted in flow, and the structure cannot be reasonably adjusted according to the actual use scene requirement, resulting in poor actual use effect of the double Venturi flowmeter.

Description

Technical Field

[0001] This invention belongs to the technical field of flow meters and their detection methods, specifically relating to a self-cleaning dual Venturi flow meter and its detection method. Background Technology

[0002] A Venturi flow meter is a commonly used device for measuring the flow rate of pressurized pipelines. It belongs to the differential pressure flow meter category and is often used to measure the flow rate of fluids such as air, natural gas, coal gas, and water. The Venturi flow meter consists of three parts: the "contraction end", the "throat end", and the "diffuser end". It is widely used due to its advantages such as simple structure, wide range of applicable operating conditions, and ease of real-time monitoring.

[0003] The working principle of a Venturi flow meter is based on the law of conservation of energy, Bernoulli's equation, and the equation of flow continuity. When fluid passes through a Venturi flow meter, the flow velocity gradually increases at the contraction end due to the gradual reduction in pipe diameter. When the fluid enters the throat end, the flow velocity reaches its maximum value due to the sharp reduction in pipe diameter. At the diffuser end, the flow velocity gradually decreases, and the fluid's kinetic energy is converted into static pressure energy. By measuring the pressure difference between the contraction section and the throat section, the flow rate of the fluid can be calculated.

[0004] In existing technologies, when monitoring liquid substances, the internal structure of the pipeline is usually fixed, making it impossible to adaptively adjust the flow rate inside the pipeline or to reasonably adjust its own structure according to the actual usage scenario. This results in poor actual performance of existing dual Venturi flow meters. Furthermore, during prolonged use, foreign objects tend to adhere to the inner wall of the existing dual Venturi flow meters, affecting the accuracy of the actual measurement. This necessitates disassembly, cleaning, and maintenance, which is a relatively cumbersome process and reduces work efficiency. Additionally, the collision of liquid flow at pipe bends can easily generate noise, thus affecting the surrounding working environment. Summary of the Invention

[0005] The purpose of this invention is to provide a self-cleaning dual Venturi flow meter and its detection method to solve the technical problem that the internal structure of pipelines is usually fixed, which makes it impossible to adaptively adjust the flow inside the pipeline or to reasonably adjust its own structure according to the actual use scenario requirements, resulting in poor actual use performance of existing dual Venturi flow meters.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A self-cleaning dual Venturi flow meter includes a constriction end and an expansion end on a pipe, the constriction end and the expansion end being connected through a throat end;

[0008] A guiding cleaning mechanism includes a rotating shaft installed on a pipe. One end of the rotating shaft is fixedly connected to a first rotating handle, and the other end extends to an annular baffle at the center of the inner wall of the pipe. Both ends of the annular baffle are provided with arc-shaped blocks placed on a push rod. The arc-shaped blocks have rounded corners near the direction of liquid flow, and the arc-shaped blocks have curved surfaces that abut against and connect with the annular baffle.

[0009] One end of the push rod is mounted on the first gear plate. The first gear plate and the side wall of the pipe are connected by a compression spring. The outer wall of the first gear plate is connected to the second gear plate by a rotating gear meshing. The first gear plate and the second gear plate are arranged perpendicularly and staggered. One end of the second gear plate is mounted on the cleaning brush. The cleaning brush is arranged in a ring shape and has a sliding groove connected along the length of the inner wall of the pipe.

[0010] Furthermore, the arc-shaped block is symmetrically arranged relative to the center of the annular baffle. As the first rotating handle drives the annular baffle to rotate, the flow rate in the pipe increases or decreases. At the same time, the curved surface on the arc-shaped block abuts and fits against the annular baffle. Under the action of the pushing force, the cleaning brush performs reciprocating horizontal movement to clean the inner wall of the pipe.

[0011] Furthermore, it also includes an adjustable silencing mechanism, which includes a lead screw shaft installed on the pipe. One end of the lead screw shaft is connected to the outer wall of the pipe through a bearing, and the other end is fixed on a second rotating handle. A slider fixed on a lifting rod is screw-driven on the lead screw shaft. The bottom end of the lifting rod passes through the pipe and extends to a baffle plate inside the pipe. The baffle plate is provided with a guide groove placed on the inner wall of the pipe.

[0012] Furthermore, both ends of the outer wall of the shield are integrally formed with protrusions, and the protrusions and the movable plate are connected by a swing rod. The outer wall of the movable plate is connected with a movable groove along the length of the pipe side wall, and one end of the movable plate is connected to a sound-absorbing component placed at the corner of the pipe by a bending rod.

[0013] Furthermore, the silencing assembly includes a silencing box and silencing plates movably connected to both ends of the inner wall of the silencing box. One end of the silencing plate is connected to the bending rod, and the silencing plate has silencing holes that are adapted to it. A silencing cavity is formed between the inner wall of the silencing box and the silencing plate. Both ends of the corner of the outer wall of the silencing box are provided with mounting holes for connecting to pipes. The silencing plate is connected to a sliding groove along the length of the inner wall of the silencing box.

[0014] Furthermore, one end of the bending rod is connected to the sound-absorbing plate by a plug-in installation, and the sound-absorbing box is provided with an opening for connecting the bending rod.

[0015] Furthermore, both ends of the swing rod are mounted on the baffle plate and the movable plate by means of rotational connection. An movable cavity connected to the swing rod is formed between the guide groove and the inner wall of the pipe, and a sealing ring connected to the movable plate is installed on the side wall of the pipe.

[0016] The self-cleaning dual Venturi flow meter testing method includes the following steps:

[0017] S1.1 When the liquid flow rate in the pipeline needs to be adjusted to increase or decrease, rotate the first handle. The first handle drives the annular baffle to rotate, so that the liquid flow rate in the pipeline can be adjusted adaptively. At the same time, the annular baffle will abut against the arc block during rotation. Under the action of the pushing force, the cleaning brush will clean the inner wall of the pipeline.

[0018] S1.2. Rotate the second handle. During the rotation of the lead screw shaft, the baffle plate moves up and down through the screw drive. The baffle plate, together with the guide groove on the inner wall of the pipe, can adaptively adjust the liquid flow rate.

[0019] During the up-and-down movement of the baffle plate in steps S1.3 and S1.2, the oscillating plates at both ends move in opposite directions through the rotational connection of the swing rod and the bending rod. During the movement of the silencing plates, the volume of the silencing cavity increases or decreases to adapt to the different vibration amplitudes generated by the noise at the corner of the pipe.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] (1) A guiding cleaning mechanism is set up. During the rotation of the first handle, the rotating shaft rotates synchronously. At this time, the annular baffle on the rotating shaft rotates from a state perpendicular to the pipe cross section to a state parallel to the pipe cross section, so that the liquid being transported can only be injected into the flow meter body through the gap between the guide hole and the guide groove and the inner wall of the pipe. During the rotation of the annular baffle, the flow rate can be adjusted adaptively. For flow rates that are too slow or too fast, corresponding compensation adjustments can be made. During the rotation of the annular baffle, the arc block on the push rod can be pushed. With the help of the compression spring and the meshing transmission between the gears, the cleaning brush can effectively clean the deposits on the inner wall of the pipe. Under the action of liquid flow, the accumulation of solid particles in the liquid is prevented. Thus, the flow meter body can be cleaned without disassembling the flow meter body. At the same time, the liquid is transported while the internal cleaning of the flow meter body is ensured, so that the flow meter body can efficiently perform its intended functions, thereby improving the application effect of the device.

[0022] (2) Set up an adjustment silencing mechanism. When the connecting pipe is small and the internal liquid flow rate is low, or when the connecting pipe is large and the internal liquid flow rate is fast, rotate the second handle to drive the screw shaft to rotate. Under the action of screw transmission, the lifting rod on the slider drives the baffle to move up and down together. During the up and down movement of the baffle, the guide groove on the inner wall of the pipe can be enlarged or reduced accordingly, so that the liquid flow rate can be increased or decreased accordingly. In addition, the screw transmission has self-locking property and can be fixed in the corresponding position. This makes it easy for the baffle to be fixed at the corresponding height and it is not easy to separate from the guide groove. Moreover, the vibration amplitude generated at the corner of the pipe is different for different liquid flow rates. During the movement of the baffle, the silencing plate can be driven to move in the opposite direction through the transmission component. Then, by changing the volume of the silencing cavity, it can effectively adapt to the vibration amplitude of different noises. With the silencing holes on the silencing plate, it can effectively reduce noise and effectively ensure a comfortable and quiet working environment.

[0023] (3) A sound-absorbing component is set up. The sound-absorbing plate has a socket and a bent rod is connected by a plug-in installation method. The structure is stable and the structural components are easy to install and disassemble when damaged, which is beneficial to personnel operation. The mounting holes on the sound-absorbing box are set to provide corresponding fixed support space for the pipe connection at the corner, which effectively improves the safety of the device. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the self-cleaning dual Venturi flowmeter of the present invention;

[0026] Figure 2 This is a front view of the self-cleaning dual Venturi flow meter of the present invention;

[0027] Figure 3 This is an internal schematic diagram of the self-cleaning dual Venturi flowmeter of the present invention;

[0028] Figure 4 This is the present invention. Figure 3 Enlarged view of point A;

[0029] Figure 5 This is a schematic diagram of the arc-shaped block of the present invention;

[0030] Figure 6This is a schematic diagram of the meshing transmission of the rotating teeth of the present invention;

[0031] Figure 7 This is a schematic diagram of the noise reduction mechanism of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of the silencer box of the present invention;

[0033] Figure 9 This is a schematic flowchart of the self-cleaning dual Venturi flowmeter detection method of the present invention.

[0034] Reference numerals: 1. Contraction end; 2. Expansion end; 3. Throat end; 4. Guide cleaning mechanism; 5. Rotating shaft; 6. First rotating handle; 7. Annular baffle; 8. Push rod; 9. Arc-shaped block; 10. Rounded corner; 11. Curved surface; 12. First gear plate; 13. Compression spring; 14. Rotating gear; 15. Second gear plate; 16. Cleaning brush; 17. Adjusting silencing mechanism; 18. Lead screw shaft; 19. Second rotating handle; 20. Lifting rod; 21. Slider; 22. Baffle plate; 23. Guide channel; 24. Movable plate; 25. Swing rod; 26. Bending rod; 27. Silencing assembly; 28. Silencing box; 29. ​​Silencing plate; 30. Silencing hole; 31. Silencing cavity; 32. Mounting hole. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Reference manual attached Figure 1 and attached Figure 2 As shown, the self-cleaning dual Venturi flow meter includes a constriction end 1 and an expansion end 2 on the pipeline, which are connected by a throat end 3; a guide cleaning mechanism 4, which includes a rotating shaft 5 installed on the pipeline, one end of which is fixedly connected to a first rotating handle 6, and the other end extends to an annular baffle 7 at the center of the inner wall of the pipeline. Both ends of the annular baffle 7 are provided with arc-shaped blocks 9 placed on a push rod 8. The arc-shaped blocks 9 are provided with rounded corners 10 near the direction of liquid flow, and the arc-shaped blocks 9 are provided with curved surfaces 11 that abut against and connect with the annular baffle 7.

[0037] One end of the push rod 8 is mounted on the first gear plate 12. The first gear plate 12 and the side wall of the pipe are connected by a compression spring 13. The outer wall of the first gear plate 12 is connected to the second gear plate 15 by a rotating tooth 14. The first gear plate 12 and the second gear plate 15 are arranged perpendicularly and staggered. One end of the second gear plate 15 is mounted on the cleaning brush 16. The cleaning brush 16 is arranged in a ring shape and has a sliding groove connected along the length of the inner wall of the pipe.

[0038] Specifically, the contraction end 1, expansion end 2, and throat end 3 on the pipeline are designed to convert the pressure difference into a signal and transmit it to the flow meter for display and feedback. Both ends of the pipeline are equipped with mounting flanges to effectively connect with external pipelines. The pipeline has positioning holes for connecting with the rotating shaft 5. This provides space for the movement of the rotating shaft 5 and prevents the rotating shaft 5 from deviating from its position during movement, thereby improving the accuracy of the transmission components.

[0039] refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 The arc-shaped block 9 is symmetrically arranged with respect to the annular baffle 7. As the first rotating handle 6 drives the annular baffle 7 to rotate, the flow rate in the pipe increases or decreases. At the same time, the curved surface 11 on the arc-shaped block 9 abuts and fits against the annular baffle 7. Under the action of the pushing force, the cleaning brush 16 performs reciprocating horizontal cleaning of the inner wall of the pipe.

[0040] Specifically, the symmetrical arrangement of the arc-shaped block 9 can transmit the rotational force of the annular baffle 7 back and forth to the arc-shaped block 9. The rounded corner 10 on the arc-shaped block 9 can reduce the resistance of the liquid when it flows through, thereby effectively ensuring that the liquid can flow freely and preventing large resistance from affecting the accuracy of flow data detection. In addition, the curved surface 11 on the arc-shaped block 9, in conjunction with its own arc-shaped surface that collides with the annular baffle 7 at the initial position, reduces the collision force by increasing the contact area. Moreover, during the rotation of the annular baffle 7, most of the force can be transmitted to the vertical push rod 8 through the curved surface 11. During the movement of the push rod 8, the first gear plate 12 moves toward the compression spring 13. Under the meshing transmission of the rotating teeth 14, the horizontal second gear plate 15 can drive the cleaning brush 16 to move synchronously. Moreover, with the help of the elastic restoring force of the compression spring 13, the cleaning brush 16 can be driven to move in the opposite direction. During the reciprocating motion of the cleaning brush 16, the particles attached to the inner wall of the pipe can be effectively removed, preventing them from affecting the normal flow detection work.

[0041] The guiding cleaning mechanism 4 is set up. During the rotation of the first handle 6, the rotating shaft 5 rotates synchronously. At this time, the annular baffle 7 on the rotating shaft 5 rotates from a state perpendicular to the pipe cross-section to a state parallel to the pipe cross-section, so that the liquid being transported can only be injected into the flow meter body through the gap between the guide hole and the guide groove and the inner wall of the pipe. During the rotation of the annular baffle 7, the flow rate can be adaptively adjusted, and corresponding compensation adjustments can be made for the flow rate that is too slow or too fast. During the rotation of the annular baffle 7, it can push the arc-shaped block 9 on the push rod 8. With the cooperation of the compression spring 13 and the meshing transmission between the gears, it can drive the cleaning brush 16 to effectively clean the deposits on the inner wall of the pipe. Under the action of liquid flow, it can also prevent the accumulation and residue of solid particles in the liquid. Thus, the internal cleaning of the flow meter body can be carried out without disassembling the flow meter body, while ensuring the liquid is being transported. This ensures that the flow meter body can efficiently perform its intended functions, thereby improving the application effect of the device.

[0042] The staggered vertical arrangement of the first gear plate 12 and the second gear plate 15 can, on the one hand, prevent interference between the transmission components during movement, allowing the first gear plate 12 and the second gear plate 15 to move normally on their own; on the other hand, it can convert the direction of force, thereby converting the horizontal Y-axis force into the X-axis force. At the same time, the first gear plate 12, the second gear plate 15, and the rotating gear 14 are all placed in a T-shaped cover on the inner wall of the pipe, thus providing effective safety protection for the above-mentioned structural components.

[0043] refer to Figure 2 , Figure 7 and Figure 8 The self-cleaning dual Venturi flow meter also includes an adjustment silencing mechanism 17, which includes a lead screw shaft 18 mounted on the pipe. One end of the lead screw shaft 18 is connected to the outer wall of the pipe through a bearing, and the other end is fixed on a second rotating handle 19. A slider 21 fixed on a lifting rod 20 is screw-driven on the lead screw shaft 18. The bottom end of the lifting rod 20 passes through the pipe and extends to a baffle plate 22 inside the pipe. The baffle plate 22 is provided with a guide groove 23 placed on the inner wall of the pipe.

[0044] The silencing mechanism 17 is configured so that when the connecting pipe has a smaller specification and a lower internal liquid flow rate, or when the connecting pipe has a larger specification and a higher internal liquid flow rate, the second handle 19 is rotated to drive the screw shaft 18 to rotate. Under the action of the screw drive, the lifting rod 20 on the slider 21 drives the baffle plate 22 to move up and down together. During the up and down movement of the baffle plate 22, the guide groove 23 on the inner wall of the pipe can be enlarged or reduced accordingly, thereby increasing or decreasing the liquid flow rate accordingly. In addition, the screw drive has a self-locking property and can be fixed in the corresponding position, which makes it easy for the baffle plate 22 to be fixed at the corresponding height and not easy to separate from the guide groove 23. Moreover, the vibration amplitude generated at the corner of the pipe is different for different liquid flow rates. During the movement of the baffle plate 22, the silencing plate 29 can be driven to move in the opposite direction through the transmission component, thereby changing the volume of the silencing cavity 31 to effectively adapt to the vibration amplitude of different noises. With the silencing holes 30 on the silencing plate 29, the noise reduction purpose can be effectively achieved, effectively ensuring a comfortable and quiet working environment.

[0045] Both ends of the outer wall of the baffle plate 22 are integrally formed with protrusions. The protrusions and the movable plate 24 are connected by a swing rod 25. The outer wall of the movable plate 24 is connected with a movable groove along the length of the pipe side wall. One end of the movable plate 24 is connected to a silencing component 27 placed at the corner of the pipe through a bending rod 26. The silencing component 27 includes a silencing box 28 and silencing plates 29 movably connected to both ends of the inner wall of the silencing box 28. One end of the silencing plate 29 is connected to the bending rod 26, and a silencing hole 30 adapted to it is opened on the silencing plate 29. A silencing cavity 31 is formed between the inner wall of the silencing box 28 and the silencing plate 29. Both ends of the corner of the outer wall of the silencing box 28 are provided with mounting holes 32 connected to the pipe. The silencing plate 29 is connected with a sliding groove along the length of the inner wall of the silencing box 28.

[0046] Specifically, the opening size of the guide channel 23 and the volume of the silencing cavity 31 change synchronously. When the liquid flow rate is high, the second handle 19 drives the lead screw shaft 18 to rotate, and through the screw transmission, it drives the baffle plate 22 connected to the lifting rod 20 to move upward. By expanding the guide channel 23, the liquid flow rate is reduced. At this time, the vibration amplitude of the noise at the pipe bend is reduced. During the upward movement of the baffle plate 22, with the help of the rotation connection of the swing rod 25, the silencing plates 29 at both ends can be moved in the center. By reducing the volume of the silencing cavity 31, it can adapt to the smaller noise vibration amplitude.

[0047] Conversely, when the liquid flow rate is high, the second handle 19 drives the lead screw shaft 18 to rotate, and through the screw transmission, it drives the baffle plate 22 connected to the lifting rod 20 to move downward. By reducing the size of the guide channel 23, the liquid flow rate is increased. At this time, the vibration amplitude of the noise at the pipe bend becomes larger. During the downward movement of the baffle plate 22, with the help of the rotation connection of the swing rod 25, the sound-absorbing plates 29 at both ends can be moved outward. By expanding the volume of the sound-absorbing cavity 31, it can adapt to the larger noise vibration amplitude.

[0048] One end of the bending rod 26 is connected to the silencing plate 29 by plug-in installation, and the silencing box 28 is provided with an opening for connecting to the bending rod 26. Both ends of the swing rod 25 are installed on the baffle plate 22 and the movable plate 24 by rotational connection. A movable cavity for connecting to the swing rod 25 is formed between the guide groove 23 and the inner wall of the pipe. A sealing ring for connecting to the movable plate 24 is installed on the side wall of the pipe. The sealing ring can be installed on the side wall of the pipe by adhesive fixation. This helps to effectively connect and fix to the pipe, and also ensures the sealing of the connection of the structural components to prevent liquid leakage.

[0049] The sound-absorbing component 27 is provided, and the sound-absorbing plate 29 has a socket and is connected to the bending rod 26 by a plug-in installation method. The structural connection is stable, and the structural components are easy to install and disassemble when damaged, which is beneficial to personnel operation. The mounting hole 32 on the sound-absorbing box 28 is provided as a fixed support space for the pipe connection at the corner, which effectively improves the safety of the device.

[0050] refer to Figure 9 The self-cleaning dual Venturi flow meter testing method includes the following steps:

[0051] S1.1 When the liquid flow rate in the pipeline needs to be adjusted to increase or decrease, rotate the first handle 6. The first handle 6 drives the annular baffle 7 to rotate, so that the liquid flow rate in the pipeline can be adjusted adaptively. At the same time, the annular baffle 7 will abut against and fit against the arc block 9 during rotation. Under the action of the pushing force, the cleaning brush 16 will clean the inner wall of the pipeline.

[0052] S1.2. Rotate the second handle 19. During the rotation of the lead screw shaft 18, the baffle plate 22 moves up and down through the screw drive. The baffle plate 22, together with the guide groove 23 on the inner wall of the pipe, can adaptively adjust the liquid flow rate.

[0053] In step S1.3 and step S1.2, during the up-and-down movement of the baffle plate 22, in conjunction with the rotational connection of the swing rod 25, the silencing plates 29 at both ends are driven to move in the opposite direction through the bending rod 26. During the movement of the silencing plate 29, the volume of the silencing cavity 31 increases or decreases, thereby adapting to the different vibration amplitudes generated by the noise at the corner of the pipe.

[0054] The entire operation and testing method is reasonably designed, which can detect the stability of the flow rate in the pipeline, and can compensate and adjust the flow rate for liquids with different flow velocities. It can effectively eliminate impurities and particles attached to the pipeline and the collision noise of liquid at the corners of the pipeline, effectively improving the use effect of the device and facilitating personnel operation.

[0055] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0056] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A self-cleaning dual Venturi flow meter, characterized in that, It includes a constriction end (1) and an expansion end (2) on the pipe, and the constriction end (1) and the expansion end (2) are connected by a throat end (3); The guide cleaning mechanism (4) includes a rotating shaft (5) installed on the pipe. One end of the rotating shaft (5) is fixedly connected to the first rotating handle (6), and the other end extends to an annular baffle (7) at the center of the inner wall of the pipe. Both ends of the annular baffle (7) are provided with arc-shaped blocks (9) placed on the push rod (8). The arc-shaped blocks (9) have rounded corners (10) near the direction of liquid flow, and the arc-shaped blocks (9) have curved surfaces (11) that abut against and connect with the annular baffle (7). One end of the push rod (8) is mounted on the first gear plate (12). The first gear plate (12) and the side wall of the pipe are connected by a compression spring (13). The outer wall of the first gear plate (12) is connected to the second gear plate (15) by a rotating tooth (14). The first gear plate (12) and the second gear plate (15) are arranged perpendicularly and staggered. One end of the second gear plate (15) is mounted on the cleaning brush (16). The cleaning brush (16) is arranged in a ring shape and has a groove connected along the length of the inner wall of the pipe. It also includes an adjustment silencing mechanism (17), which includes a lead screw shaft (18) installed on the pipe. One end of the lead screw shaft (18) is connected to the outer wall of the pipe through a bearing, and the other end is fixed on a second rotating handle (19). A slider (21) fixed on a lifting rod (20) is screwed on the lead screw shaft (18). The bottom end of the lifting rod (20) passes through the pipe and extends to a baffle plate (22) inside the pipe. The baffle plate (22) is provided with a guide groove (23) placed on the inner wall of the pipe. Both ends of the outer wall of the shield (22) are integrally formed with protrusions. The protrusions and the movable plate (24) are connected by a swing rod (25). The outer wall of the movable plate (24) is connected with a movable groove along the length of the pipe side wall. One end of the movable plate (24) is connected to a sound-absorbing component (27) placed at the corner of the pipe by a bending rod (26). The noise reduction assembly (27) includes a noise reduction box (28) and a noise reduction plate (29) movably connected to both ends of the inner wall of the noise reduction box (28). One end of the noise reduction plate (29) is connected to the bending rod (26), and a noise reduction hole (30) adapted to it is provided on the noise reduction plate (29).

2. The self-cleaning dual Venturi flow meter according to claim 1, characterized in that, The arc-shaped block (9) is symmetrically arranged relative to the annular baffle (7). As the first rotating handle (6) drives the annular baffle (7) to rotate, the flow rate in the pipe increases or decreases. At the same time, the curved surface (11) on the arc-shaped block (9) abuts against and fits against the annular baffle (7). Under the action of the pushing force, the cleaning brush (16) performs reciprocating horizontal cleaning of the inner wall of the pipe.

3. The self-cleaning dual Venturi flow meter according to claim 1, characterized in that, A silencing cavity (31) is formed between the inner wall of the silencing box (28) and the silencing plate (29), and both ends of the corner of the outer wall of the silencing box (28) are provided with mounting holes (32) for connecting to the pipe. The silencing plate (29) is connected with a sliding groove along the length of the inner wall of the silencing box (28).

4. The self-cleaning dual Venturi flow meter according to claim 1, characterized in that, One end of the bending rod (26) is connected to the sound-absorbing plate (29) by plug-in installation, and the sound-absorbing box (28) is provided with an opening for connection with the bending rod (26).

5. The self-cleaning dual Venturi flow meter according to claim 1, characterized in that, Both ends of the swing rod (25) are mounted on the baffle plate (22) and the movable plate (24) by means of rotational connection. An movable cavity connected to the swing rod (25) is formed between the guide groove (23) and the inner wall of the pipe, and a sealing ring connected to the movable plate (24) is installed on the side wall of the pipe.

6. A method for detecting a self-cleaning dual Venturi flow meter, applied to the self-cleaning dual Venturi flow meter according to any one of claims 1-5, characterized in that, Includes the following steps: S1.1 When the liquid flow rate in the pipeline needs to be adjusted to increase or decrease, rotate the first handle (6). The first handle (6) drives the annular baffle (7) to rotate, so that the liquid flow rate in the pipeline can be adjusted adaptively. At the same time, the annular baffle (7) will contact and adhere to the arc block (9) during the rotation process. Under the action of the pushing force, the cleaning brush (16) will clean the inner wall of the pipeline. S1.

2. Rotate the second handle (19). During the rotation of the lead screw shaft (18), the baffle plate (22) moves up and down through the screw drive. The baffle plate (22) cooperates with the guide groove (23) on the inner wall of the pipe to adaptably adjust the liquid flow rate. S1.3, Step S1.2 During the up-and-down movement of the shield (22), in conjunction with the rotational connection of the swing rod (25), the sound-absorbing plates (29) at both ends are driven to move in the opposite direction through the bending rod (26). During the movement of the sound-absorbing plate (29), the volume of the sound-absorbing cavity (31) increases or decreases, so as to adapt to the different vibration amplitudes generated by the noise at the corner of the pipe.

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