Streamlined plate flowmeter

Abstract

The application discloses a streamlined plate type flowmeter, relates to the field of flowmeters, and comprises a flowmeter pipeline, a flowmeter shell is fixed on the flowmeter pipeline, a rotating shaft is rotationally connected in the flowmeter shell, a streamlined plate type mechanism is arranged in the flowmeter shell, and a shock mechanism is arranged in the flowmeter shell. The liquid generates a pushing force and pushes the streamlined plate type mechanism, the streamlined plate type mechanism is offset under the support of the rotating shaft, the liquid passes through the flowmeter shell, the streamlined plate type mechanism drives a pointer on the flowmeter surface to be offset when the streamlined plate type mechanism is offset, the pointer on the flowmeter surface is uniformly offset under the driving of the streamlined plate type mechanism, so that the pointer on the flowmeter surface can keep uniform movement when the liquid flow increases, and the possibility that the offset position of the pointer on the flowmeter surface is smaller and smaller when the liquid flow is larger and larger is reduced, and the reading is influenced.

Description

Technical Field

[0001] This application relates to the field of flow meters, and in particular to streamlined plate flow meters. Background Technology

[0002] In industrial settings, flow meters are instruments used to measure fluid flow rate. They are among the most important instruments in industrial measurement. With industrial development, the requirements for the accuracy and range of flow measurement are becoming increasingly stringent. To adapt to various applications, different types of flow meters have emerged and are widely used in industries such as oil and gas, petrochemicals, water treatment, food and beverage, pharmaceuticals, energy, metallurgy, pulp and paper, and building materials.

[0003] Plate flow meters are a type of existing flow meter. Structurally, they generally consist of a pipe, baffle, rotating shaft, spring, and base plate. Their advantages include simple structure and easy maintenance. They are used in various flow measurement applications and are widely used for process flow measurement in pipelines and for testing the cooling and lubrication systems of various large, medium, and small equipment.

[0004] However, during use, due to the existing spring supporting the baffle, the spring is twisted when the baffle is pushed by the liquid. As the flow rate increases, the spring's torsional offset becomes smaller and smaller. This results in the scale angle being smaller when the flow rate is higher and larger when the flow rate is lower, causing uneven display scales. This leads to a decrease in accuracy in the high flow rate area and inaccurate readings. Summary of the Invention

[0005] The purpose of this application is to solve the problem mentioned in the background art that, due to the existing spring supporting the baffle, when the baffle is pushed by the liquid, the spring is twisted. As the flow rate increases, the spring torsional offset becomes smaller and smaller, which leads to the scale angle being smaller when the flow rate is larger and larger when the flow rate is smaller, resulting in uneven scale display. This causes the accuracy of the high flow rate area to decrease and the reading to be inaccurate. This application provides a streamlined plate flow meter.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution:

[0007] A streamlined plate flow meter includes a flow meter pipe, a flow meter housing fixed on the flow meter pipe, a rotating shaft rotatably connected inside the flow meter housing, a streamlined plate mechanism inside the flow meter housing, an oscillation mechanism inside the flow meter housing, and a flow meter surface mounted on one side of the flow meter housing.

[0008] By adopting the above technical solution, when the liquid passes through the flow meter housing from the flow meter pipe, the thrust generated by the liquid pushes it towards the streamlined plate mechanism. Supported by the rotating shaft, the streamlined plate mechanism shifts. As the liquid passes through the flow meter housing, the shift of the streamlined plate mechanism causes the pointer on the flow meter surface to shift as well. Driven by the streamlined plate mechanism, the pointer on the flow meter surface shifts uniformly, thus enabling the pointer on the flow meter surface to maintain a uniform movement as the liquid flow rate increases. This reduces the possibility that the pointer on the flow meter surface will shift to a smaller and smaller position as the liquid flow rate increases, thus affecting the reading.

[0009] Furthermore, the streamlined plate mechanism includes a baffle mounted on a rotating shaft. One end of the baffle is fixed with a rotating sleeve, which is fixedly connected to the rotating shaft. A resistance spring is mounted on the rotating shaft. One end of the resistance spring extends out of the rotating sleeve and abuts against the flow meter housing. The other end of the resistance spring extends out of the rotating sleeve and abuts against the baffle. An arc-shaped plate is mounted on the end of the baffle away from the rotating sleeve, and both ends of the arc-shaped plate are fixedly connected to the flow meter housing.

[0010] By adopting the above technical solution, when the liquid flows through the flowmeter housing, the liquid pushes the baffle open. When the baffle is pushed open, it drives the rotating sleeve and twists the resistance spring. The baffle drives the rotating sleeve, which in turn drives the rotating shaft to rotate. Then, the rotating shaft causes the pointer on the flowmeter surface to deviate. The value of the pointer deviates is the flow rate of the liquid. This allows the baffle to move evenly under the resistance spring, and the pointer on the flowmeter surface to move evenly. This reduces the possibility of large scale widths in small flow areas and small scale widths in large flow areas on the flowmeter surface, which can easily cause reading deviations and reduce display accuracy.

[0011] Furthermore, the arc-shaped groove of the arc-shaped plate faces the baffle, and the arc-shaped plate abuts against the end of the baffle away from the rotating sleeve.

[0012] By adopting the above technical solution, the baffle is made to abut against the edge of the groove of the arc plate. When the liquid passes between the baffle and the arc plate, the baffle can rotate evenly when pushed by the liquid.

[0013] Furthermore, the formula for the resistance of the arc-shaped plate is FD=CD·AD·(ρ·U0) 2 ) / 2, where the flow velocity U0=Q / AD, Q is the fluid flow rate, FD is the total resistance, CD is the total resistance coefficient, ρ is the fluid density, AD is the flow area, where AD=L·Tn, L is the length of the baffle, and Tn is the gap between the baffle and the arc plate when the baffle is rotated to a certain position.

[0014] By adopting the above technical solution, based on the known flow range of the plate flow meter, T0, T1, T2, T3... Tn under various flow conditions are derived. Then, the calculated data at each position are retained, which allows the values ​​corresponding to the pointer on the flow meter surface to be evenly distributed. This reduces the possibility that the scale width is large in the small flow area and small in the large flow area on the flow meter surface, which can easily cause reading deviations and reduce display accuracy.

[0015] Furthermore, the oscillation mechanism includes a support frame fixed to the flow meter housing, the support frame being located on the side of the arc plate away from the baffle, a rotating shaft being rotatably connected to the support frame, an oscillation component being provided at one end of the rotating shaft, and a drive component being provided at the other end of the rotating shaft.

[0016] By adopting the above technical solution, the drive component directly drives the rotating shaft, which in turn drives the oscillation component. The oscillation component vibrates the bottom of the arc plate at a high frequency, causing the arc plate to vibrate. When the crystals on the baffle come into contact with the arc plate, the crystals on the baffle are shaken off. This allows the crystals at the edge of the baffle to fall off when the baffle comes into contact with the arc plate, reducing the possibility of the baffle and the arc plate coming into contact and moving.

[0017] Furthermore, the oscillation assembly includes an oscillation block fixed on a rotating shaft, an oscillation head is provided on both sides of the oscillation block, and an oscillation spring is provided between the oscillation head and the oscillation block. Both ends of the oscillation spring are fixedly connected to the oscillation head and the oscillation block.

[0018] By adopting the above technical solution, the drive component drives the rotating shaft to rotate, the rotating shaft drives the oscillating block to rotate, the oscillating block drives the oscillating spring, the oscillating spring drives the oscillating head, and when the oscillating head is driven to rotate, it quickly and repeatedly hits the bottom of the arc plate, thereby making the arc plate vibrate. When the crystals at the edge of the baffle come into contact with the arc plate, they can be detached, reducing the possibility of the crystals affecting the baffle coming into contact with the arc plate.

[0019] Furthermore, the drive assembly includes a drive motor fixed to the flow meter housing, a magnetic coupling disk one fixed to the output end of the drive motor, a magnetic coupling disk two fixed to the rotating shaft, and magnetic transmission between the magnetic coupling disk one and the magnetic coupling disk two.

[0020] By adopting the above technical solution, the magnetic coupling disk one drives the magnetic coupling disk two to rotate under the action of magnetic force, and the magnetic coupling disk two drives the rotating shaft to rotate, thereby enabling the drive motor to drive the rotating shaft to rotate through the flow meter housing.

[0021] Furthermore, the side of the oscillating head away from the oscillating spring is arc-shaped, and the arc shape of the oscillating head corresponds to the arc-shaped plate.

[0022] By adopting the above technical solution, the arc-shaped surface of the vibrating head abuts against the surface of the arc-shaped plate, thereby reducing the collision between the vibrating head and the arc-shaped plate.

[0023] In summary, this application includes at least one of the following beneficial effects;

[0024] 1. This application utilizes the formula FD=CDADρU0² / 2 for the resistance of an arc-shaped plate, where the flow velocity U0=Q / AD, Q is the fluid flow rate, FD is the total resistance, CD is the total resistance coefficient, ρ is the fluid density, and AD is the flow area. AD=L*Tn, where L is the length of the baffle and Tn is the gap between the baffle and the arc-shaped plate when the baffle rotates to a certain position. The calculation steps are as follows: Based on the known flow range of the plate flow meter, derive T0, T1, T2, T3...Tn for each flow state. Then, retain the calculated data for each position. Based on the calculated data, sketch the approximate streamline shape of the arc-shaped plate. Set the streamline shape of the arc-shaped plate according to the streamline shape. Then, calculate the size of the matching resistance spring based on the streamlined arc-shaped plate, thus controlling the resistance of the main force-bearing components. The spring corresponds to the arc-shaped plate. When the liquid flows through the flowmeter housing, the liquid pushes the baffle open. When the baffle is pushed open, it drives the rotating sleeve and twists the resistance spring. The baffle drives the rotating sleeve, which in turn drives the rotating shaft to rotate. The rotating shaft then causes the pointer on the flowmeter surface to deflect. The value of the pointer deflection is the flow rate of the liquid. The liquid passes through the gap between the baffle and the arc-shaped plate. Guided by the arc-shaped plate, the baffle can move evenly under the resistance of the resistance spring. This achieves the purpose of making the baffle move evenly under the resistance of the spring, and making the pointer on the flowmeter surface move evenly. This reduces the possibility of large scale width in small flow areas and small scale width in large flow areas on the flowmeter surface, which can easily cause reading deviations and reduce display accuracy.

[0025] 2. In this application, the drive component drives the rotating shaft to rotate, the rotating shaft drives the oscillating block to rotate, the oscillating block drives the oscillating spring, and the oscillating spring drives the oscillating head. When the oscillating head is driven to rotate, it rapidly and repeatedly strikes the bottom of the arc plate. When the crystals on the baffle come into contact with the arc plate, the crystals on the baffle are shaken off, thus achieving the purpose of making the arc plate vibrate. When the crystals on the edge of the baffle come into contact with the arc plate, they can be shaken off, reducing the possibility of the crystals affecting the baffle coming into contact with the arc plate.

[0026] 3. In this application, when the rotating shaft needs to rotate, the drive motor drives the first magnetic coupling disk to rotate, and the first magnetic coupling disk drives the second magnetic coupling disk to rotate under the action of magnetic force, and the second magnetic coupling disk drives the rotating shaft to rotate, thereby achieving the purpose of enabling the drive motor to support the flow meter housing and drive the rotating shaft to rotate. Attached Figure Description

[0027] Figure 1 This is a first three-dimensional structural schematic diagram of the streamlined plate flow meter in this application;

[0028] Figure 2 This is a second three-dimensional structural schematic diagram of the streamlined plate flow meter in this application;

[0029] Figure 3 This is a third-dimensional structural schematic diagram of the streamlined plate flow meter in this application;

[0030] Figure 4 This is a schematic diagram of the formula calculation in this application;

[0031] Figure 5 This application Figure 3 Enlarged diagram of point A in the middle.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Flowmeter pipe; 2. Flowmeter housing; 3. Rotating shaft; 4. Streamlined plate mechanism; 41. Baffle; 42. Resistance spring; 43. Arc plate; 44. Rotating sleeve; 5. Oscillating mechanism; 51. Support frame; 52. Rotating shaft; 53. Oscillating assembly; 531. Oscillating block; 532. Oscillating head; 533. Oscillating spring; 54. Drive assembly; 541. Drive motor; 542. Magnetic coupling disc one; 543. Magnetic coupling disc two; 6. Flowmeter surface. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1 —5 provides further detailed description of this application.

[0035] This application discloses a streamlined plate flow meter.

[0036] Reference Figure 1 , Figure 2 and Figure 3 A streamlined plate flow meter includes a flow meter pipe 1, a flow meter housing 2 fixed on the flow meter pipe 1, a rotating shaft 3 rotatably connected inside the flow meter housing 2, a streamlined plate mechanism 4 inside the flow meter housing 2, an oscillation mechanism 5 inside the flow meter housing 2, and a flow meter surface 6 installed on one side of the flow meter housing 2.

[0037] When using this flow meter, first connect the flow meter pipe 1 to the conveying pipe whose flow rate needs to be monitored, ensuring communication between the conveying pipe and the flow meter pipe 1. As the liquid flows from the flow meter pipe 1 through the flow meter housing 2, the thrust generated by the liquid pushes against the streamlined plate mechanism 4. Supported by the rotating shaft 3, the streamlined plate mechanism 4 shifts, causing the pointer on the flow meter surface 6 to shift as the liquid flows through the flow meter housing 2. Under the influence of the streamlined plate mechanism 4, the pointer on the flow meter surface 6 shifts uniformly. The value of the pointer shift on the flow meter surface 6 is the flow rate of the liquid passing through. The liquid flowing through the flow meter pipe 1 is easily... When the liquid is crystallizing, at a low flow rate, the oscillation mechanism 5 is used to vibrate the streamlined plate mechanism 4 at a high frequency, causing the crystals on the streamlined plate mechanism 4 to fall off, reducing the possibility of crystals affecting the movement of the streamlined plate mechanism 4. By allowing the liquid to pass through the streamlined plate mechanism 4, the streamlined plate mechanism 4 moves evenly under the support of the rotating shaft 3, causing the streamlined plate mechanism 4 to drive the pointer on the flowmeter surface 6 to move evenly. This allows the pointer on the flowmeter surface 6 to maintain a uniform movement when the liquid flow rate increases, reducing the possibility of the pointer on the flowmeter surface 6 shifting to a smaller and smaller position as the liquid flow rate increases, thus affecting the reading.

[0038] Reference Figure 1 , Figure 2 and Figure 3 The streamlined plate mechanism 4 includes a baffle 41 mounted on a rotating shaft 3. One end of the baffle 41 is fixed with a rotating sleeve 44, which is fixedly connected to the rotating shaft 3. A resistance spring 42 is mounted on the rotating shaft 3. One end of the resistance spring 42 extends out of the rotating sleeve 44 and abuts against the flow meter housing 2. The other end of the resistance spring 42 extends out of the rotating sleeve 44 and abuts against the baffle 41. An arc-shaped plate 43 is mounted on the end of the baffle 41 away from the rotating sleeve 44. Both ends of the arc-shaped plate 43 are fixedly connected to the flow meter housing 2.

[0039] When no liquid flows through the flowmeter housing 2, under the action of the resistance spring 42, the baffle 41, supported by the rotating sleeve 44, rotates on the rotating shaft 3, causing the baffle 41 to deflect towards the convex direction of the arc plate 43. The baffle 41 and the arc plate 43 then come into contact. When the flowmeter housing 2 is in a closed state, the pointer on the flowmeter surface 6 returns to zero. When liquid flows through the flowmeter housing 2, the liquid pushes the baffle 41 open. When the baffle 41 is pushed open, it drives the rotating sleeve 44 and twists the resistance spring 42. The baffle 41 drives the rotating sleeve 44, which in turn drives the rotating shaft 3 to rotate. Then, the rotating shaft 3 causes the pointer on the flowmeter surface 6 to deflect. The value of the pointer deflection is the flow rate of the liquid. The liquid flows from between the baffle 41 and the arc plate 43... When the liquid passes through the gap between the arc plate 43 and the baffle 41, guided by the arc plate 43, the baffle 41 can move evenly under the resistance spring 42. By making the baffle 41 and the arc plate 43 abut against each other, the liquid passes through the gap between the baffle 41 and the arc plate 43. When the liquid passes through the arc plate 43, it is guided by the arc plate 43, so that the pressure of the liquid flow corresponds to the elastic potential energy of the resistance spring 42. This allows the baffle 41 to move evenly under the resistance spring 42, and the pointer on the flowmeter surface 6 to move evenly. This reduces the possibility of large scale width in the small flow area and small scale width in the large flow area on the flowmeter surface 6, which can easily cause reading deviations and reduce display accuracy.

[0040] Reference Figure 2 and Figure 3 The arc-shaped groove of the arc-shaped plate 43 faces the baffle 41, and the end of the arc-shaped plate 43 and the baffle 41 away from the rotating sleeve 44 abuts against each other. Supported by the resistance spring 42, the baffle 41 moves towards the edge of the arc-shaped plate 43, so that the baffle 41 abuts against the edge of the groove of the arc-shaped plate 43. When the liquid passes between the baffle 41 and the arc-shaped plate 43 in the liquid, the groove of the arc-shaped plate 43 increases the flow area of ​​the liquid. By increasing the flow area of ​​the liquid by the arc-shaped plate 43, the baffle 41 can rotate evenly when pushed by the liquid.

[0041] Reference Figure 4 The resistance formula for the curved plate 43 is FD=CD·AD·(ρ·U0) 2) / 2, where the flow velocity U0=Q / AD, Q is the fluid flow rate, FD is the total resistance, CD is the total resistance coefficient, ρ is the fluid density, AD is the flow area, where AD=L·Tn, L is the length of the baffle 41, and Tn is the gap between the baffle 41 and the arc plate 43 when the baffle 41 is rotated to a certain position. The calculation steps are as follows: Based on the known flow range of the plate flow meter, derive T0, T1, T2, T3...Tn for each flow state. Then, retain the calculated position data. Based on the calculated data, sketch the approximate streamline shape of the arc plate 43. Set the streamline shape of the arc plate 43 according to the streamline shape. Then, calculate the size of the matching resistance spring 42 based on the streamlined arc plate 43, so that the main force-bearing component, the resistance spring 42, corresponds to the arc plate 43. Calculate the spacing of the uniformly distributed Tn position data using the above formula. This allows the value corresponding to the pointer on the flow meter surface 6 to be evenly distributed, reducing the possibility of large scale width in small flow areas and small scale width in large flow areas on the flow meter surface 6, which can easily cause reading deviations and reduce display accuracy.

[0042] Reference Figure 2 , Figure 3 and Figure 5 The oscillation mechanism 5 includes a support frame 51 fixed on the flow meter housing 2. The support frame 51 is located on the side of the arc plate 43 away from the baffle 41. A rotating shaft 52 is rotatably connected to the support frame 51. An oscillation component 53 is provided at one end of the rotating shaft 52, and a drive component 54 is provided at the other end of the rotating shaft 52.

[0043] When a liquid prone to crystallization flows through the flowmeter housing 2, the gap between the baffle 41 and the arc plate 43 is small when the liquid flow rate is low. As the liquid passes through, crystals may form at the gap near the end of the baffle 41 close to the arc plate 43. The crystals adhere to the baffle 41. The drive assembly 54 drives the rotating shaft 52, which in turn drives the oscillation assembly 53. The oscillation assembly 53 vibrates the bottom of the arc plate 43 at a high frequency, causing the arc plate 43 to vibrate. When the crystals on the baffle 41 come into contact with the arc plate 43, the crystals on the baffle 41 are shaken off and then washed away by the flowing liquid. By using the drive assembly 54 to drive the rotating shaft 52 to rotate, the rotating shaft 52 drives the oscillation assembly 53, which vibrates the arc plate 43 at a high frequency. This allows the crystals at the edge of the baffle 41 to fall off when the baffle 41 comes into contact with the arc plate 43, reducing the possibility of contact and movement between the baffle 41 and the arc plate 43.

[0044] Reference Figure 3 and Figure 5The oscillation assembly 53 includes an oscillation block 531 fixed on the rotating shaft 52. An oscillation head 532 is provided on both sides of the oscillation block 531. An oscillation spring 533 is provided between the oscillation head 532 and the oscillation block 531. Both ends of the oscillation spring 533 are fixedly connected to the oscillation head 532 and the oscillation block 531.

[0045] The drive assembly 54 drives the rotating shaft 52 to rotate, the rotating shaft 52 drives the oscillating block 531 to rotate, the oscillating block 531 drives the oscillating spring 533, and the oscillating spring 533 drives the oscillating head 532. When the oscillating head 532 is driven to rotate, it quickly and repeatedly strikes the bottom of the arc plate 43. When the crystals on the baffle 41 come into contact with the arc plate 43, the crystals on the baffle 41 are shaken off. By having the rotating shaft 52 drive the oscillating block 531, which in turn drives the oscillating spring 533, which in turn drives the oscillating head 532 to strike the arc plate 43, the arc plate 43 can be made to vibrate. When the crystals on the edge of the baffle 41 come into contact with the arc plate 43, the crystals can be made to fall off, reducing the possibility of the crystals affecting the baffle 41 coming into contact with the arc plate 43.

[0046] Reference Figure 3 and Figure 5 The drive assembly 54 includes a drive motor 541 fixed to the flow meter housing 2. A magnetic coupling disk 542 is fixed to the output end of the drive motor 541, and a magnetic coupling disk 543 is fixed to the rotating shaft 52. Magnetic coupling disks 542 and 543 are connected by magnetic force. When the rotating shaft 52 needs to rotate, the drive motor 541 drives the magnetic coupling disk 542 to rotate. Under the action of magnetic force, the magnetic coupling disk 542 drives the magnetic coupling disk 543 to rotate, which in turn drives the rotating shaft 52 to rotate. By using the magnetic coupling disk 542 to drive the magnetic coupling disk 543 to rotate, the drive motor 541 can drive the rotating shaft 52 to rotate through the flow meter housing 2.

[0047] Reference Figure 3 and Figure 5 The side of the oscillating head 532 away from the oscillating spring 533 is arc-shaped, and the arc shape of the oscillating head 532 corresponds to the arc plate 43. When the oscillating block 531 drives the oscillating head 532 to rotate, the arc-shaped surface of the oscillating head abuts against the surface of the arc plate 43. By making the side of the oscillating head 532 close to the arc plate 43 arc-shaped, the collision between the oscillating head 532 and the arc plate 43 can be reduced.

[0048] Working principle: First, connect the flow meter pipe 1 to the conveying pipe whose flow rate needs to be monitored, so that the conveying pipe is connected to the flow meter pipe 1. When the liquid passes through the flow meter housing 2 from the flow meter pipe 1, the thrust generated by the liquid pushes against the baffle 41. When the baffle 41 is pushed open, it drives the rotating sleeve 44 and twists the resistance spring 42. The baffle 41 drives the rotating sleeve 44, which in turn drives the rotating shaft 3 to rotate. Then, the rotating shaft 3 causes the pointer on the flow meter surface 6 to deflect. The value of the pointer deflection is the flow rate of the liquid. The liquid passes through the gap between the baffle 41 and the arc plate 43. Guided by the arc plate 43, when the liquid passes through the gap between the arc plate 43 and the baffle 41, the baffle 41 can withstand the resistance spring 42. Under the obstruction, the baffle 41 drives the rotating sleeve 44, which in turn drives the pointer on the surface 6 of the flow meter. When the flow meter housing 2 flows through a liquid that is prone to crystallization, the gap between the baffle 41 and the arc plate 43 is small when the liquid flow rate is low. When the liquid passes through, the baffle 41 is close to one end of the arc plate 43, and crystals may form at the gap. The crystals adhere to the baffle 41. The drive assembly 54 drives the rotating shaft 52, which in turn drives the oscillation assembly 53. The oscillation assembly 53 vibrates the bottom of the arc plate 43 at a high frequency, causing the arc plate 43 to vibrate. When the crystals on the baffle 41 come into contact with the arc plate 43, the crystals on the baffle 41 are shaken off and then washed away by the flowing liquid.

Claims

1. A streamlined plate flow meter, including a flow meter pipe (1), characterized in that: The flow meter pipe (1) is fixed with a flow meter housing (2), a rotating shaft (3) is rotatably connected inside the flow meter housing (2), a streamlined plate mechanism (4) is provided inside the flow meter housing (2), an oscillation mechanism (5) is provided inside the flow meter housing (2), and a flow meter surface (6) is installed on one side of the flow meter housing (2). The streamlined plate mechanism (4) includes a baffle (41) disposed on a rotating shaft (3). A rotating sleeve (44) is fixed at one end of the baffle (41). The rotating sleeve (44) is fixedly connected to the rotating shaft (3). A resistance spring (42) is sleeved on the rotating shaft (3). One end of the resistance spring (42) extends out of the rotating sleeve (44) and abuts against the flow meter housing (2). The other end of the resistance spring (42) extends out of the rotating sleeve (44) and abuts against the baffle (41). An arc plate (43) is disposed at the end of the baffle (41) away from the rotating sleeve (44). Both ends of the arc plate (43) are fixedly connected to the flow meter housing (2). The arc-shaped groove of the arc plate (43) faces the baffle (41), and the arc plate (43) and the baffle (41) abut against the end away from the rotating sleeve (44).

2. The streamlined plate flow meter according to claim 1, characterized in that: The resistance formula for the arc-shaped plate (43) is FD=CD·AD·(ρ·U0) 2 ) / 2, where the flow velocity U0=Q / AD, Q is the fluid flow rate, FD is the total resistance, CD is the total resistance coefficient, ρ is the fluid density, AD is the flow area, where AD=L·Tn, L is the length of the baffle (41), and Tn is the gap between the baffle (41) and the arc plate (43) when the baffle (41) is rotated to a certain position.

3. The streamlined plate flow meter according to claim 1, characterized in that: The oscillation mechanism (5) includes a support frame (51) fixed on the flow meter housing (2). The support frame (51) is located on the side of the arc plate (43) away from the baffle (41). A rotating shaft (52) is rotatably connected to the support frame (51). An oscillation component (53) is provided at one end of the rotating shaft (52), and a drive component (54) is provided at the other end of the rotating shaft (52).

4. The streamlined plate flow meter according to claim 3, characterized in that: The oscillation assembly (53) includes an oscillation block (531) fixed on a rotating shaft (52). An oscillation head (532) is provided on both sides of the oscillation block (531). An oscillation spring (533) is provided between the oscillation head (532) and the oscillation block (531). Both ends of the oscillation spring (533) are fixedly connected to the oscillation head (532) and the oscillation block (531).

5. The streamlined plate flow meter according to claim 4, characterized in that: The drive assembly (54) includes a drive motor (541) fixed on the flow meter housing (2), a magnetic coupling disk one (542) fixed at the output end of the drive motor (541), a magnetic coupling disk two (543) fixed on the rotating shaft (52), and magnetic transmission between the magnetic coupling disk one (542) and the magnetic coupling disk two (543).

6. The streamlined plate flow meter according to claim 4, characterized in that: The side of the oscillating head (532) away from the oscillating spring (533) is arc-shaped, and the arc shape of the oscillating head (532) corresponds to the arc plate (43).

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