Impeller rotating system of turbine flowmeter and dynamic balancing method

Abstract

The application discloses a turbine flowmeter impeller rotating system and a dynamic balancing method, relates to the technical field of flow measurement, and comprises a turbine flowmeter shell, a core shaft, two flow guides and a rotating mechanism. A plurality of turbine blades are fixedly connected to the side wall of the core shaft. The flow guides are fixedly connected to the turbine flowmeter shell through a plurality of screws. The rotating mechanism comprises a static cavity formed in the flow guide. The core shaft penetrates into the static cavity at both ends. The static cavity is filled with magnetorheological fluid. A ceramic ball is fixedly connected to the inner wall of the static cavity. A tapered groove is formed in the side wall of the ceramic ball. In the application, the rotating speed of the core shaft is monitored in real time through a rotating speed sensor. The current size of a magnetic induction coil is controlled by using a PLC, the viscosity of the magnetorheological fluid is controlled, the damping force is changed, and the displacement of the core shaft in the axial and radial directions is actively inhibited. The on-demand response mechanism fundamentally solves the stability problem caused by high-speed vibration and water hammer impact.

Description

Technical Field

[0001] This invention relates to the field of flow measurement technology, and in particular to the impeller rotation system and dynamic balancing method of a turbine flow meter. Background Technology

[0002] As a high-precision flow measurement instrument, turbine flow meters are widely used in industrial process control, energy metering and other fields. Its core principle is to calculate the flow rate by measuring the rotation speed of the impeller driven by the fluid. The stability, low friction and long life of the impeller rotation system are the key to ensuring the measurement accuracy and reliability of turbine flow meters.

[0003] Traditional turbine flow meters generally adopt a floating guide and a top-mounted mandrel structure. However, this type of structure still has many problems in long-term use: First, under high-speed rotation, fluid pulsation or vertical installation conditions, the impeller mandrel is prone to radial and axial movement, which leads to fluctuations in the measurement signal, decreased accuracy, and even bearing wear or breakage; Second, the mechanism has poor durability, is prone to abnormal noise during operation, is not resistant to media impact, and is easily damaged. Summary of the Invention

[0004] The purpose of this invention is to provide an impeller rotation system and dynamic balancing method for a turbine flow meter to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The impeller rotation system of the turbine flow meter includes a turbine flow meter housing, a spindle, two guide members, and a rotation mechanism. Multiple turbine blades are fixedly connected to the side wall of the spindle, and the guide members are fixedly connected to the turbine flow meter housing by multiple screws.

[0007] The rotating mechanism includes a static cavity formed within a flow guide, with both ends of the mandrel extending into the static cavity. The static cavity is filled with magnetorheological fluid, and a ceramic ball is fixedly connected to the inner wall of the static cavity. A conical groove is formed on the side wall of the ceramic ball. A hemispherical surface is formed at one end of the mandrel located within the static cavity, and the hemispherical surface slides against the inner wall of the conical groove. An annular cavity is formed within each of the two flow guides, and the annular cavity surrounds the static cavity. A magnetic coil is fixedly connected to the inner wall of each of the two annular cavities. A mounting groove is formed on the side wall of the flow guide, and a speed sensor is fixedly connected to the inner wall of the mounting groove. The speed sensor is connected to the magnetic coil through a PLC control circuit.

[0008] Preferably, a permanent magnet is embedded inside the ceramic sphere.

[0009] Preferably, a miniature displacement sensor is fixedly connected to the inner wall of the conical groove, and the miniature displacement sensor is connected to the magnetic coil through a PLC control circuit.

[0010] Preferably, a bushing is fixedly connected to the inner wall of the mounting groove, the bushing is sleeved on the side wall of the mandrel, and an oil passage is opened inside the bushing.

[0011] Preferably, the guide member is equipped with an oil pumping mechanism, the oil pumping mechanism includes an oil pumping chamber opened in the guide member, the oil pumping chamber is filled with lubricating oil, a magnetic plate is slidably connected to the inner wall of the oil pumping chamber, a spring is fixedly connected between the magnetic plate and the inner wall of the oil pumping chamber, and the oil pumping chamber is connected to the oil passage in the bushing through a connecting pipe.

[0012] Preferably, a semiconductor cooling chip is fixedly embedded in the inner wall of the pump oil chamber.

[0013] Preferably, the ceramic ball comprises a ceramic layer, a functional layer, and a shock-absorbing layer. The functional layer is disposed on the outer surface of the ceramic layer, and the shock-absorbing layer is disposed on the inner surface of the ceramic layer. The ceramic layer is made of ceramic material, the functional layer is a DLC coating, and the shock-absorbing layer is made of polyurethane elastic material.

[0014] Preferably, the bushing comprises a base layer, a reinforcing layer, and a lubricating layer. The reinforcing layer is disposed on the outer surface of the base layer, and the lubricating layer is disposed on the inner surface of the base layer. The base layer is made of PEEK material, the reinforcing layer is made of ceramic fiber material, and the lubricating layer is made of a mixture of PTFE nanoparticles and graphene.

[0015] Preferably, the magnetorheological fluid contains nano-sized iron oxide particles and nano-sized silica thixotropic agents.

[0016] The present invention also provides a dynamic balancing method for the impeller rotation system of a turbine flow meter, the dynamic balancing method comprising the following steps:

[0017] S1. When the fluid enters the turbine flow meter housing, the turbine blades begin to rotate under the fluid drive. The speed sensor monitors the spindle speed in real time and transmits the data to the PLC control circuit. The miniature displacement sensor monitors the relative position change of the spindle in the conical groove in real time and detects the tendency of radial runout.

[0018] S2. The speed sensor adjusts the current of the magnetic coil according to the received speed signal. When the speed increases, the current is automatically increased to enhance the magnetic field strength, thereby increasing the viscosity of the magnetorheological fluid. This suppresses axial and radial movement through shear resistance. When the speed decreases, the current is automatically reduced to decrease the magnetic field strength, allowing the magnetorheological fluid to return to a low viscosity state and reducing rotational resistance. When the miniature displacement sensor detects that the spindle is biased to one side, it will increase the current of the magnetic coil corresponding to the biased side through the PLC control circuit to implement asymmetrical current compensation, thereby generating a gradient magnetic field and gradient damping force in the static cavity to achieve active correction.

[0019] S3. When the spindle speed increases, the magnetic field attracts the magnetic plate to move, pushing more lubricating oil into the oil passage in the bushing. When the speed decreases, the spring returns to its original position and reduces the oil supply, while the semiconductor cooling chip cools the lubricating oil to maintain the optimal viscosity range of the oil.

[0020] S4. When the speed sensor fails or the system is powered off, the permanent magnet provides the basic bias magnetic field to maintain the basic damping force of the magnetorheological fluid, ensuring the minimum stability of the system. The system continuously executes steps S1-S3 in a loop to achieve closed-loop dynamic balance control with speed sensing, damping adaptation, and lubrication coordination.

[0021] The present invention has the following beneficial effects:

[0022] 1. By setting up a rotating mechanism, the system monitors the spindle speed in real time through a speed sensor and uses a PLC to control the current supplied to the magnetic coil. During normal and stable rotation, the system maintains a low-damping state to ensure that the spindle rotates flexibly and the starting flow is low. Once a tendency for surging caused by high speed or vibration is detected, the magnetic field is immediately strengthened, causing the viscosity of the magnetorheological fluid to increase dramatically, generating a strong damping force, actively suppressing the axial and radial displacement of the spindle, and solving the stability problem caused by high-speed vibration and water hammer impact.

[0023] 2. The core support part adopts a point contact structure between ceramic balls and the hemispherical surface of the spindle, and is supplemented with DLC coating to reduce friction and wear to an extremely low level. At the same time, the magnetorheological fluid damping is a non-contact force transmission, which avoids direct friction and wear between solids. This allows the impeller system to maintain extremely high rotational coaxiality and initial accuracy after long-term operation, extending the instrument calibration cycle and service life.

[0024] 3. By integrating a miniature displacement sensor in the ceramic ball conical groove, the system can sense the slight sway of the mandrel in real time. Once eccentricity is detected, the system immediately applies asymmetrical current compensation to the magnetic coil on one side to generate gradient damping force, which automatically pushes the mandrel back to the center position. This function effectively compensates for interferences such as manufacturing errors and asymmetrical fluid impact, and enhances the robustness of the system.

[0025] 4. The oil pump mechanism is linked to the rotation speed. The higher the rotation speed, the stronger the magnetic field of the magnetic coil, which pushes the magnetic plate to press more lubricating oil into the bushing, meeting the lubrication and heat dissipation requirements at high speeds. When the rotation speed decreases, some lubricating oil is automatically drawn back to reduce low-speed resistance. Combined with the precise temperature control of the semiconductor cooling chip, the viscosity of the lubricating oil is always maintained within the optimal range, taking into account both low friction and high reliability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the impeller rotation system of the turbine flow meter proposed in this invention;

[0027] Figure 2for Figure 1 A cross-sectional schematic diagram of the casing of the turbine flow meter;

[0028] Figure 3 for Figure 2 Cross-sectional view of the central guide component

[0029] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the diagram;

[0030] Figure 5 for Figure 2 Schematic diagram of the middle guide component;

[0031] Figure 6 for Figure 4 Schematic diagram of the structure of the ceramic ball;

[0032] Figure 7 for Figure 6 Schematic diagram of the layered structure of the ceramic spheres;

[0033] Figure 8 for Figure 4 Schematic diagram of the central bushing;

[0034] Figure 9 for Figure 8 A schematic diagram of the material layering structure of the central bushing.

[0035] In the diagram: 1. Turbine flow meter housing; 2. Mandrel; 3. Flow guide; 4. Turbine blade; 5. Static cavity; 501. Magnetorheological fluid; 6. Ceramic ball; 601. Ceramic layer; 602. Functional layer; 603. Damping layer; 7. Annular cavity; 8. Magnetic coil; 9. Speed ​​sensor; 10. Hemispherical surface; 11. Conical groove; 12. Permanent magnet; 13. Miniature displacement sensor; 14. Mounting groove; 15. Bushing; 151. Substrate layer; 152. Reinforcing layer; 153. Lubricating layer; 16. Pump oil chamber; 17. Magnetic plate; 18. Spring; 19. Connecting pipe; 20. Semiconductor cooling chip; 21. Screw. Detailed Implementation

[0036] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Reference Figures 1-9The impeller rotation system of the turbine flow meter includes a turbine flow meter housing 1, a spindle 2, two guide members 3 and a rotation mechanism. Multiple turbine blades 4 are fixedly connected to the side wall of the spindle 2. The guide members 3 are fixedly connected to the turbine flow meter housing 1 by multiple screws 21. An elastic retaining ring is provided between the guide members 3 and the turbine flow meter housing 1.

[0038] The rotating mechanism includes a static cavity 5 formed within the flow guide 3. Both ends of the spindle 2 extend into the static cavity 5. The static cavity 5 is filled with magnetorheological fluid 501, which contains nano-sized iron oxide particles and nano-silica thixotropic agents. A ceramic ball 6 is fixedly connected to the inner wall of the static cavity 5. A conical groove 11 is formed on the side wall of the ceramic ball 6. A hemispherical surface 10 is formed at one end of the spindle 2 within the static cavity 5, and the hemispherical surface 10 slides against the inner wall of the conical groove 11. Both flow guides 3 have annular cavities 7 surrounding the static cavity 5. Magnetic coils 8 are fixedly connected to the inner walls of both annular cavities 7. An installation groove 14 is formed on the side wall of the flow guide 3, and a speed sensor 9 is fixedly connected to the inner wall of the installation groove 14. The speed sensor 9 is connected to the magnetic coil 8 via a PLC control circuit.

[0039] Furthermore, the fluid enters the turbine flow meter housing 1, causing the turbine blades 4 to rotate, which in turn drives the spindle 2 to rotate. Due to the design of the hemispherical surfaces 10 at both ends of the spindle 2 and the opening of the conical grooves 11 on the side wall of the ceramic ball 6, the hemispherical surfaces 10 and the conical grooves 11 form a continuous annular point contact, which greatly reduces the contact area between the spindle 2 and the ceramic ball 6, thereby significantly reducing the damping. In addition, the conical grooves 11, together with the hemispherical surfaces 10, can limit the spindle 2, ensuring the stability of the spindle 2 under high-speed rotation, and solving the problem of easy damage to the flow meter caused by vertical installation and water hammer phenomenon on site.

[0040] The ceramic ball 6 is composed of a ceramic layer 601, a functional layer 602 and a shock-absorbing layer 603. The functional layer 602 is disposed on the outer surface of the ceramic layer 601 and the shock-absorbing layer 603 is disposed on the inner surface of the ceramic layer 601. The ceramic layer 601 is made of ceramic material, the functional layer 602 is a DLC coating, and the shock-absorbing layer 603 is made of polyurethane elastic material.

[0041] Furthermore, the spindle 2 may experience radial and axial movement due to vibration during high-speed rotation. The speed sensor 9 detects the spindle 2's rotation speed and controls the current flowing through the magnetic coil 8 via the PLC control circuit. The faster the spindle 2 rotates, the greater the current flowing through the magnetic coil 8, resulting in a stronger magnetic field. This makes the magnetorheological fluid 501 more viscous. The viscous magnetorheological fluid 501 generates significant shear resistance in the gap between the hemisphere 10 and the conical groove 11. This shear resistance inhibits the spindle 2's tendency to move along the axial direction. When the outer mandrel 2 moves in the radial direction, the hemispherical surface 10 will generate an oblique clamping force on the surface of the conical groove 11. This clamping force can be decomposed into two directions: axial and radial. In the radial direction, the viscous magnetorheological fluid 501 will generate a normal reaction force when squeezed, thereby suppressing the radial movement of the mandrel 2. Therefore, when the mandrel 2 moves erratically, its movement can be suppressed in both the axial and radial directions, so that the mandrel 2 can achieve dynamic equilibrium. Furthermore, the damping force that suppresses the erratic movement of the mandrel 2 can be automatically adjusted according to the rotational speed of the mandrel 2, so that the mandrel 2 can adaptively adjust its damping stiffness according to the rotational speed or vibration state.

[0042] It should be noted that the nano-sized iron oxide particles in magnetorheological fluid 501 can fill the spaces between the micron-sized particles in the magnetorheological fluid 501, making the chain structure within the magnetorheological fluid 501 more compact, significantly improving zero-field viscosity and anti-settling properties, and solving the problem of sedimentation and caking after long-term standing. Meanwhile, the nano-silica thixotropic agent can form a weak three-dimensional network, giving the magnetorheological fluid 501 a gel-like structure when at rest, further preventing sedimentation. Under shear, the viscosity decreases rapidly, ensuring low-resistance start-up.

[0043] A permanent magnet 12 is embedded inside the ceramic ball 6.

[0044] It should be noted that, since the functional layer 602 is a DLC coating, it can further reduce the coefficient of friction between the ceramic ball 6 and the hemispherical surface 10 of the spindle 2, achieving near-zero wear and enhancing corrosion resistance. The damping layer 603 can absorb microscopic impacts and protect the permanent magnet 12 and the ceramic ball 6 from brittle fracture.

[0045] It is worth mentioning that, firstly, when the magnetic induction coil 8 is energized, the magnetic field it generates is vector-superimposed with the bias magnetic field of the permanent magnet 12, forming a composite magnetic field around the ceramic sphere 6 with a strength far exceeding that generated by the magnetic induction coil 8 alone. This stronger magnetic field enables the magnetorheological fluid 501 to generate higher shear yield stress, thus providing greater suppression of the mandrel 2's movement. To achieve the same damping effect, the current required by the magnetic induction coil 8 can be smaller, reducing the system's power consumption and heat generation. Furthermore, the initial magnetic field can pre-prepare the magnetorheological fluid 501 particles, allowing for faster reinforcement of the chain structure when the magnetic induction coil 8 is energized. Secondly, the magnetic field of the permanent magnet 12 firmly attracts the magnetic particles in the magnetorheological fluid 501, causing them to form a high-concentration pre-arrangement near the surface of the ceramic sphere 6. This ensures that when the magnetic coil 8 is energized, the high-damping region with a sharp increase in viscosity is precisely and preferentially formed around the contact area between the conical groove 11 and the hemispherical surface 10, which is the core friction pair where the most axial movement needs to be suppressed. This avoids the magnetic field energy being dispersed throughout the entire static cavity 5, improving damping efficiency and control accuracy, and achieving precise control. Finally, even when the magnetic coil 8 is completely de-energized, the magnetic field of the permanent magnet 12 itself still exists and will still have a certain solidification effect on the magnetorheological fluid 501, providing a basic, constant, and small damping force. This basic damping force can help suppress small random vibrations when the system is not activated, increasing the inherent stability of the system, while not generating any energy consumption, providing basic stability, and making the transition of the system from low damping to high damping smoother.

[0046] A miniature displacement sensor 13 is fixedly connected to the inner wall of the conical groove 11. The miniature displacement sensor 13 is connected to the magnetic coil 8 through a PLC control circuit.

[0047] Furthermore, when the spindle 2 is biased to one side, the miniature displacement sensor 13 on that side will sense the signal and, through the PLC control circuit, make the current flowing through the magnetic coil 8 on that side greater, thereby generating an asymmetrical damping force on both sides. The larger damping force will push the spindle 2 to the other side, thereby achieving active correction of the spindle 2.

[0048] A bushing 15 is fixedly connected to the inner wall of the mounting groove 14. The bushing 15 is sleeved on the side wall of the spindle 2, and an oil passage is opened inside the bushing 15. The bushing 15 can support the spindle 2.

[0049] The bushing 15 consists of a base layer 151, a reinforcing layer 152, and a lubricating layer 153. The reinforcing layer 152 is disposed on the outer surface of the base layer 151, and the lubricating layer 153 is disposed on the inner surface of the base layer 151. The base layer 151 is made of PEEK material, the reinforcing layer 152 is made of ceramic fiber material, and the lubricating layer 153 is made of a mixture of PTFE nanoparticles and graphene.

[0050] It should be noted that the base layer 151 of the bushing 15 is made of PEEK material, which can ensure its overall strength and chemical resistance. The reinforcing layer 152 is made of ceramic fiber material, which can improve the overall compressive strength and toughness to resist water hammer impact. The lubrication layer 153 is made of a mixture of PTFE nanoparticles and graphene, which achieves an extremely low coefficient of friction and self-lubrication, minimizing the damping force between the bushing 15 and the spindle 2 and improving the accuracy of the system.

[0051] The guide member 3 is equipped with an oil pumping mechanism, which includes an oil pumping chamber 16 opened in the guide member 3. The oil pumping chamber 16 is filled with lubricating oil. A magnetic plate 17 is slidably connected to the inner wall of the oil pumping chamber 16. A spring 18 is fixedly connected between the magnetic plate 17 and the inner wall of the oil pumping chamber 16. The oil pumping chamber 16 is connected to the oil passage in the bushing 15 through a connecting pipe 19.

[0052] Furthermore, the faster the spindle 2 rotates, the more lubricating oil is needed to ensure its lubrication effect, while the slower the rotation speed, the less lubricating oil is needed. Excessive lubricating oil should be avoided to prevent it from increasing the rotational resistance of the spindle 2 and causing a decrease in accuracy. Therefore, the faster the spindle 2 rotates, the stronger the magnetic field generated by the magnetic coil 8 becomes, and consequently, the greater the attraction to the magnetic plate 17. At this time, the magnetic plate 17 will have a greater force to overcome the elastic force of the spring 18 and move to the left (e.g., Figure 4 As shown in the diagram, more lubricating oil in the pump oil chamber 16 will be squeezed into the oil passage in the bushing 15 through the connecting pipe 19, providing sufficient lubrication for the rotation of the spindle 2. Conversely, when the spindle 2 rotates slower, the magnetic field strength generated by the magnetic coil 8 is smaller, and the magnetic attraction force on the magnetic plate 17 is smaller. At this time, the spring 18 will pull the magnetic plate 17 to slide to the right, so that some of the lubricating oil in the bushing 15 is drawn into the pump oil chamber 16 through the connecting pipe 19, reducing the lubricating oil in the bushing 15 and reducing the rotational resistance of the spindle 2. Therefore, the entire device can automatically adjust the amount of lubricating oil between the bushing 15 and the spindle 2 according to the rotational speed of the spindle 2, thereby ensuring the lubrication effect.

[0053] A semiconductor cooling chip 20 is fixedly embedded in the inner wall of the oil pump chamber 16. The cooling surface of the semiconductor cooling chip 20 faces the inside of the oil pump chamber 16, and its heat dissipation surface faces the outside of the oil pump chamber 16. The semiconductor cooling chip 20 can cool the lubricating oil, which can ensure the lubricating oil has the best viscosity, thereby providing effective lubrication.

[0054] The present invention also provides a dynamic balancing method for the impeller rotation system of a turbine flow meter, the dynamic balancing method comprising the following steps:

[0055] S1. When the starting fluid enters the turbine flow meter housing 1, the turbine blades 4 begin to rotate under the fluid drive. The speed sensor 9 monitors the speed of the spindle 2 in real time and transmits the data to the PLC control circuit. The miniature displacement sensor 13 monitors the relative position change of the spindle 2 in the conical groove 11 in real time and detects the tendency of radial movement.

[0056] S2. The speed sensor 9 adjusts the current of the magnetic coil 8 according to the received speed signal. When the speed increases, the current is automatically increased to enhance the magnetic field strength, thereby increasing the viscosity of the magnetorheological fluid 501. This suppresses axial and radial movement through shear resistance. When the speed decreases, the current is automatically reduced to decrease the magnetic field strength, thereby restoring the magnetorheological fluid 501 to a low viscosity state and reducing rotational resistance. When the micro displacement sensor 13 detects that the spindle 2 is biased to one side, it will increase the current of the magnetic coil 8 corresponding to the biased side through the PLC control circuit to implement asymmetrical current compensation, thereby generating a gradient magnetic field and gradient damping force in the static cavity 5 to achieve active correction.

[0057] S3. When the spindle 2 speed increases, the magnetic field attracts the magnetic plate 17 to move, pushing more lubricating oil into the oil passage in the bushing 15. When the speed decreases, the spring 18 returns to its original position to reduce the oil supply, while the semiconductor cooling chip 20 cools the lubricating oil to maintain the optimal viscosity range of the oil.

[0058] S4. When the speed sensor 9 fails or the system is powered off, the permanent magnet 12 provides a basic bias magnetic field to maintain the basic damping force of the magnetorheological fluid 501, ensuring the minimum stability of the system. The system continuously executes steps S1-S3 in a loop to achieve closed-loop dynamic balance control with speed sensing, damping self-adaptation, and lubrication coordination.

[0059] The above description is only a preferred embodiment 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.

Claims

1. An impeller rotation system for a turbine flow meter, comprising a turbine flow meter housing (1), a spindle (2), two guide vanes (3), and a rotation mechanism, characterized in that, Multiple turbine blades (4) are fixedly connected to the side wall of the spindle (2), and the flow guide (3) is fixedly connected to the turbine flow meter housing (1) by multiple screws (21); The rotating mechanism includes a static cavity (5) opened in the flow guide (3), the two ends of the mandrel (2) respectively penetrate into the static cavity (5), the static cavity (5) is filled with magnetorheological fluid (501), a ceramic ball (6) is fixedly connected to the inner wall of the static cavity (5), a conical groove (11) is opened on the side wall of the ceramic ball (6), a hemispherical surface (10) is opened at one end of the mandrel (2) located in the static cavity (5), the hemispherical surface (10) slides against the inner wall of the conical groove (11), an annular cavity (7) is opened in both flow guides (3), the annular cavity (7) is arranged around the static cavity (5), a magnetic induction coil (8) is fixedly connected to the inner wall of both annular cavities (7), an installation groove (14) is opened on the side wall of the flow guide (3), a speed sensor (9) is fixedly connected to the inner wall of the installation groove (14), and the speed sensor (9) is connected to the magnetic induction coil (8) through a PLC control circuit.

2. The impeller rotation system of the turbine flow meter according to claim 1, characterized in that, A permanent magnet (12) is fixedly embedded inside the ceramic ball (6).

3. The impeller rotation system of the turbine flow meter according to claim 2, characterized in that, A miniature displacement sensor (13) is fixedly connected to the inner wall of the conical groove (11), and the miniature displacement sensor (13) is connected to the magnetic coil (8) through a PLC control circuit.

4. The impeller rotation system of the turbine flow meter according to claim 3, characterized in that, A bushing (15) is fixedly connected to the inner wall of the mounting groove (14). The bushing (15) is sleeved on the side wall of the spindle (2), and an oil passage is opened in the bushing (15).

5. The impeller rotation system of the turbine flow meter according to claim 4, characterized in that, The guide member (3) is equipped with an oil pumping mechanism, which includes an oil pumping chamber (16) opened in the guide member (3). The oil pumping chamber (16) is filled with lubricating oil. A magnetic plate (17) is slidably connected to the inner wall of the oil pumping chamber (16). A spring (18) is fixedly connected between the magnetic plate (17) and the inner wall of the oil pumping chamber (16). The oil pumping chamber (16) is connected to the oil passage in the bushing (15) through a connecting pipe (19).

6. The impeller rotation system of the turbine flow meter according to claim 5, characterized in that, A semiconductor cooling chip (20) is fixedly embedded in the inner wall of the pump oil chamber (16).

7. The impeller rotation system of the turbine flow meter according to claim 1, characterized in that, The ceramic ball (6) is composed of a ceramic layer (601), a functional layer (602) and a shock-absorbing layer (603). The functional layer (602) is disposed on the outer surface of the ceramic layer (601), and the shock-absorbing layer (603) is disposed on the inner surface of the ceramic layer (601). The ceramic layer (601) is made of ceramic material, the functional layer (602) is a DLC coating, and the shock-absorbing layer (603) is made of polyurethane elastic material.

8. The impeller rotation system of the turbine flow meter according to claim 4, characterized in that, The bushing (15) is composed of a base layer (151), a reinforcing layer (152) and a lubricating layer (153). The reinforcing layer (152) is disposed on the outer surface of the base layer (151), and the lubricating layer (153) is disposed on the inner surface of the base layer (151). The base layer (151) is made of PEEK material, the reinforcing layer (152) is made of ceramic fiber material, and the lubricating layer (153) is made of a mixture of PTFE nanoparticles and graphene.

9. The impeller rotation system of the turbine flow meter according to claim 1, characterized in that, The magnetorheological fluid (501) contains nano-sized iron oxide particles and nano-silica thixotropic agents.

10. A dynamic balancing method for the impeller rotation system of a turbine flow meter, characterized in that, Implemented using the impeller rotation system of a turbine flow meter according to claim 6, the dynamic balancing method includes the following steps: S1. Start the fluid into the turbine flow meter housing (1), the turbine blades (4) start to rotate under the fluid drive, the speed sensor (9) monitors the speed of the spindle (2) in real time and transmits the data to the PLC control circuit, the miniature displacement sensor (13) monitors the relative position change of the spindle (2) in the conical groove (11) in real time and detects the tendency of radial movement; S2. The speed sensor (9) adjusts the current of the magnetic coil (8) according to the received speed signal. When the speed increases, the current is automatically increased to enhance the magnetic field strength, thereby increasing the viscosity of the magnetorheological fluid (501) and suppressing axial and radial movement through shear resistance. When the speed decreases, the current is automatically reduced to reduce the magnetic field strength, thereby restoring the magnetorheological fluid (501) to a low viscosity state and reducing rotational resistance. When the micro displacement sensor (13) detects that the spindle (2) is biased to one side, it will increase the current of the magnetic coil (8) corresponding to the biased side through the PLC control circuit to implement asymmetrical current compensation, thereby generating a gradient magnetic field and gradient damping force in the static cavity (5) to achieve active correction. S3. When the spindle (2) speed increases, the magnetic field attracts the magnetic plate (17) to move, pushing more lubricating oil into the oil passage in the bushing (15). When the speed decreases, the spring (18) resets and reduces the oil supply, while the semiconductor cooling chip (20) cools the lubricating oil to maintain the optimal viscosity range of the oil. S4. When the speed sensor (9) fails or the system is powered off, the permanent magnet (12) provides the basic bias magnetic field to maintain the basic damping force of the magnetorheological fluid (501) and ensure the minimum stability of the system. The system continuously executes steps S1-S3 in a loop to achieve closed-loop dynamic balance control with speed sensing, damping adaptation and lubrication coordination.

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