Magnetic levitation turbine flowmeter

Abstract

The application provides a magnetic suspension turbine flowmeter, which comprises a shell with a through fluid passage, a turbine rotor coaxially arranged in the fluid passage, a radial suspension assembly for radially suspending the turbine rotor in the fluid passage and an axial suspension assembly for axially suspending the turbine rotor in the fluid passage. The radial suspension assembly and the axial suspension assembly combine to form a three-dimensional magnetic field restraint system, which can balance various external forces such as self-gravity of the turbine rotor and fluid impact force in real time, effectively compensate for the deviation caused by factors such as fluid disturbance and equipment vibration, and ensure that the turbine rotor is always stably suspended in the center of the flow passage. The two assemblies cooperatively form a full-range magnetic field restraint, so that the turbine rotor is completely contactlessly suspended without mechanical support, contact friction is eliminated, the optimal detection range is increased, the flow rate of low-flow-rate fluid can be accurately detected, the internal fluid is not hindered by the support structure, the flow passage is smooth, the pressure loss is further reduced, and the metering reliability of the flowmeter is improved.

Description

Technical Field

[0001] This invention relates to the field of metering instrument technology, and specifically to a magnetic levitation turbine flow meter. Background Technology

[0002] Traditional turbine flow meters rely on bearings and a shaft to support the rotor, which rotates under the influence of fluid to detect flow. However, this mechanical support structure inevitably generates contact friction, especially at low flow rates. The fluid driving force is insufficient to overcome static and dynamic frictional resistance, causing the rotor to fail to start smoothly or rotate normally. This results in problems such as high initial flow rate, poor measurement performance at low flow rates, and inaccurate detection at low flow rates. Therefore, the optimal detection range for ordinary turbine flow meters is 30%-70%. In extremely low flow rate conditions under natural circulation, to measure flow, a method of reducing the diameter (cross-sectional area) is usually used to increase the local flow velocity, bringing it into the flow meter's optimal measurement range. However, the driving force of natural circulation is inherently very weak, and reducing the diameter significantly increases local resistance, leading to a reduction in circulation volume. This not only affects the overall heat exchange performance of the system but also means that the measurement results cannot accurately and stably reflect the actual flow rate of the system.

[0003] To eliminate mechanical friction and improve low-flow-rate response, magnetic levitation technology has been introduced into turbine flow meters. This technology uses magnetic support to achieve non-contact rotor rotation, significantly reducing resistance and expanding the measurement range for small flow rates. For example, the existing technology with patent publication number CN1405534A employs two types of magnetic levitation support schemes: passive magnetic levitation relies on the repulsive force between radially magnetized, axially tilted permanent magnets to achieve non-contact levitation on the rotor's output side, while the input side achieves positioning through single-point contact. Active magnetic levitation generates radial magnetic levitation force by controlling the current of four electromagnets, which, combined with the axial repulsive force of the permanent magnets, maintains single-point contact on the input side, achieving low-friction, high-precision levitation support. However, in the above technologies, the output end of the rotor is levitated by the repulsive force between the permanent magnets, while the input end is supported by a single-point contact with the center of the fluid sensor. It can be seen that contact friction still exists between the rotor's input end and the fluid sensor in this technology; furthermore, the permanent magnets are placed in the fluid channel, occupying flow space and hindering fluid flow, leading to increased fluid pressure loss. The prior art patent with publication number CN201575829U uses second magnets embedded at both ends of the rotor, which are of the same polarity and gap-fitted with the first magnet on the rectifier, to form a non-contact air bearing at both ends of the rotor using repulsive force. However, the first and second magnets can only achieve axial suspension support for the rotor. In the radial direction, a stabilizer limits the rotor shaft to prevent excessive tilting. Therefore, during use, the rotor inevitably comes into contact with the stabilizer, resulting in contact friction. Similarly, the stabilizer, placed in the fluid, also obstructs fluid flow. The prior art patent with publication number CN201575829U uses the radial repulsive force of inner and outer ring permanent magnets to radially position the rotating shaft at the center of the sleeve, and uses the axial repulsive force of the upper and lower ring permanent magnets to suspend the rotating component in a fixed horizontal position. Since only one end of the rotating component is subjected to the axial repulsive force of the upper and lower ring permanent magnets, in order to ensure the force balance of the rotor in the axial direction, the flow meter in the rotating component actually abuts against the upper and lower water inlet baffles fixed to the inner sleeve to achieve axial force balance. Therefore, the rotating component in this technology actually has contact friction. Similarly, the inner and outer ring permanent magnets, the upper and lower ring permanent magnets, and the upper and lower water inlet baffles in this technology are all set in the fluid channel, occupying the flow channel space and causing an increase in fluid pressure loss.

[0004] Therefore, existing magnetic levitation turbine flow meters, limited by the stability of the static magnetic field and the method of structural implementation, still require supporting components such as a central shaft, bearings, brackets, and limiting sleeves inside the flow channel to constrain the rotor position and prevent displacement or collision. This does not truly achieve a supportless flow channel structure. While these supporting components retained inside the pipe solve the rotor levitation and positioning problem, they introduce a series of inherent defects: the supports occupy flow channel space, obstruct fluid flow, and increase pressure loss; furthermore, the brackets and shaft system disrupt the flow field uniformity, generating eddies and turbulence, affecting measurement accuracy and linearity.

[0005] It is evident that although existing magnetic levitation flow meters eliminate bearing friction through magnetic levitation, they still rely on internal support components and thus fail to fundamentally overcome the limitations of traditional structures. While improving low-flow-rate performance, they also introduce new problems such as pressure loss and turbulence, making it impossible to achieve truly stable, reliable, and interference-free flow measurement.

[0006] To address the shortcomings of the existing technologies, there is an urgent need to develop a magnetic levitation turbine flow meter. This would solve the problems of poor low-flow-rate performance caused by mechanical friction in traditional turbine flow meters, and excessive pressure loss due to fluid obstruction caused by the internal support of existing magnetic levitation flow meters, which would affect the metering accuracy. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a magnetic levitation turbine flow meter. Through the unsupported magnetic levitation design, the optimal detection range of the turbine flow meter is increased, enabling accurate detection of the flow rate of low-velocity fluids. It also eliminates the problem of excessive pressure loss caused by internal support components, which affects the metering accuracy and improves the metering reliability.

[0008] To achieve the above-mentioned technical objectives, the present invention provides a magnetic levitation turbine flow meter, which includes:

[0009] A housing, wherein the housing has a through-flow fluid channel;

[0010] A turbine rotor, which is coaxially disposed within a fluid channel;

[0011] A radial suspension assembly includes a first magnetic component disposed on a turbine rotor and a second magnetic component disposed opposite to the first magnetic component outside a fluid channel. The magnetic field generated by the first magnetic component and the magnetic field generated by the second magnetic component interact to make the turbine rotor radially suspended in the fluid channel.

[0012] An axial suspension assembly includes a third magnetic component disposed at the end of a turbine rotor and a fourth magnetic component disposed on a housing opposite to the third magnetic component. The magnetic fields generated by the third magnetic component and the fourth magnetic component interact to suspend the turbine rotor axially in the fluid channel.

[0013] The second and / or fourth magnetic components are electromagnetic coils;

[0014] A position sensor is provided, with its sensing end facing the turbine rotor. The position sensor is connected to an electromagnetic coil via a control module, and the control module controls the current flowing through the electromagnetic coil based on the sensing information from the position sensor.

[0015] Preferably, the first magnetic component and the third magnetic component are permanent magnets.

[0016] Preferably, the second magnetic component is located outside the housing or inside the housing wall.

[0017] Preferably, the turbine rotor includes a support portion and an impeller portion, the impeller portion is fixedly disposed on the support portion, and the first magnetic component is disposed on the support portion.

[0018] Preferably, the support portion includes an annular support portion, one end of the impeller portion is fixed to the inner wall of the annular support portion, and the other end extends radially inward along the annular support portion, and the first magnetic component is disposed in the annular support portion.

[0019] Preferably, the support portion further includes an inner support shaft coaxially disposed within the annular support portion, with one end of the impeller portion fixed to the inner support shaft and the other end extending radially outward along the inner support shaft to the inner wall of the annular support portion.

[0020] Preferably, the inner wall of the housing is recessed with an annular limiting cavity, and the annular support portion of the turbine rotor is embedded in the annular limiting cavity.

[0021] Preferably, the inner wall diameter of the annular support portion is consistent with the diameter of the fluid channel of the shell.

[0022] Preferably, the first magnetic component is embedded in the annular support portion, and the second magnetic component is embedded in the housing wall at the annular limiting cavity relative to the first magnetic component.

[0023] Preferably, the third magnetic component is disposed at the axial end of the annular support portion, and the fourth magnetic component is embedded in the housing wall at the annular limiting cavity relative to the third magnetic component.

[0024] Compared with the prior art, the beneficial effects of the present invention include:

[0025] The radial suspension component in this invention provides a uniform radial centering force to the turbine rotor, precisely constraining its radial displacement and preventing radial deviation and contact with the pipe wall. The axial suspension component provides a symmetrical axial positioning force, limiting the axial movement of the turbine rotor and preventing it from colliding with the pipe end wall. Together, they form a comprehensive magnetic field constraint, allowing the turbine rotor to be completely suspended without contact or support without any mechanical support or limiting components. This completely eliminates the contact friction caused by residual support in existing magnetic levitation schemes, increasing the optimal detection range of the turbine flow meter. It enables accurate detection of the flow velocity of low-velocity fluids, solving the problems of excessive frictional resistance and rotor inability to start smoothly at low flow rates. It also solves the problem of increased fluid pressure loss caused by changing the fluid channel diameter. At the same time, the unsupported structure completely eliminates fluid obstruction caused by internal support components, ensuring unobstructed flow and minimizing pressure loss during fluid flow. This avoids measurement errors caused by excessive pressure loss and improves the measurement reliability of the flow meter.

[0026] The static magnetic field provided by the permanent magnet is a passive magnetic field, with its magnetic field strength and polarity fixed, generating a stable reference magnetic field solely through its inherent magnetism. The electromagnetic field formed by passing a controllable current through the electromagnetic coil is an active magnetic field, whose strength and direction can be adjusted in real time by the current. Based on Enshao's theorem, a single static magnetic field cannot form stable levitation. This invention sets a second and / or fourth magnetic component as an electromagnetic coil to add an active magnetic field. A position sensor monitors the displacement of the turbine rotor in real time, and the control module quickly adjusts the coil current according to the displacement deviation, changing the strength of the active magnetic field. By precisely balancing gravity and external force disturbances through the active magnetic field, the turbine rotor achieves stable magnetic levitation.

[0027] The combination of radial and axial suspension components forms a three-dimensional magnetic field constraint system, which can balance various external forces such as the turbine rotor's own weight and fluid impact force in real time. It effectively compensates for turbine rotor offset caused by factors such as fluid disturbance and equipment vibration, ensuring that the turbine rotor is always stably suspended in the center of the flow channel without tilting, shaking or colliding. It solves the pain point of unstable suspension and easy offset caused by only a single-direction magnetic field support in the existing magnetic levitation scheme, and is suitable for various complex metering conditions such as low flow rate, high flow rate, and high pressure.

[0028] By setting the inner wall diameter of the annular support to be consistent with the fluid channel diameter of the shell, and embedding the annular support of the turbine rotor into the annular limiting cavity, the inner wall of the fluid channel is smooth and without protrusions, ensuring that the flow path is unobstructed throughout and without any structure that obstructs the flow of fluid, thus minimizing pressure loss.

[0029] This magnetic levitation turbine flow meter is particularly suitable for flow velocity measurement under extremely low flow velocity conditions in natural circulation. Since the starting resistance of the turbine rotor of this flow meter is infinitely close to 0, there is no need to use the method of reducing the diameter to increase the local flow velocity. That is, this flow meter will not increase the local resistance when measuring the flow rate, nor will it affect the circulation volume and the overall heat exchange performance of the system. The measurement results can truly and stably reflect the actual flow rate of the system. Attached Figure Description

[0030] Figure 1 This is a cross-sectional schematic diagram of the second magnetic component of the magnetic levitation turbine flowmeter in Embodiment 1, which is an electromagnetic coil;

[0031] Figure 2 This is a cross-sectional schematic diagram of the second magnetic component of the magnetic levitation turbine flowmeter in Embodiment 2, which is disposed outside the housing;

[0032] Figure 3 This is a cross-sectional schematic diagram of the fourth magnetic component of the magnetic levitation turbine flow meter in Embodiment 2, which is disposed outside the housing;

[0033] Figure 4 This is a cross-sectional schematic diagram of the fourth magnetic component of the magnetic levitation turbine flow meter in Example 3, which is an electromagnetic coil.

[0034] Figure 5 This is a cross-sectional schematic diagram of the magnetic levitation turbine flow meter in Example 4;

[0035] Figure 6 This is a cross-sectional schematic diagram of the second and fourth magnetic components of the magnetic levitation turbine flowmeter in Embodiment 5, both of which are electromagnetic coils.

[0036] The meanings of the reference numerals in the attached figures are as follows:

[0037] 1. Housing; 11. Fluid channel; 12. Annular limiting cavity; 2. Turbine rotor; 21. Support part; 211. Annular support part; 212. Inner support shaft; 22. Impeller part; 3. Radial suspension assembly; 31. First magnetic component; 311. Inner radial annular magnet; 32. Second magnetic component; 321. Outer radial electromagnetic coil assembly; 322. Outer radial annular magnet; 4. Axial suspension assembly; 43. Third magnetic component; 431. Inner axial annular magnet; 44. Fourth magnetic component; 441. Outer axial annular magnet; 442. Outer axial electromagnetic coil assembly. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0039] While existing magnetic levitation flow meters eliminate bearing friction through magnetic levitation, they still rely on internal support components, failing to fundamentally overcome the limitations of traditional structures. While improving low-flow-rate performance, they introduce new problems such as pressure loss and turbulence, making it impossible to achieve truly stable, reliable, and interference-free flow measurement. To address these issues, this invention provides a magnetic levitation turbine flow meter, comprising: a housing 1, a turbine rotor 2, a radial suspension assembly 3, an axial suspension assembly 4, a position sensor, and a rotational speed detection component. A through-flow fluid channel 11 is provided inside the housing 1; the turbine rotor 2 is coaxially disposed within the fluid channel 11; the radial suspension assembly 3 includes a first magnetic component 31 disposed on the turbine rotor 2 and a second magnetic component 32 disposed opposite to the first magnetic component 31 outside the fluid channel 11. The magnetic fields generated by the first magnetic component 31 and the second magnetic component 32 interact to suspend the turbine rotor 2 radially within the fluid channel 11; the axial suspension assembly 4 includes a third magnetic component 43 disposed at the end of the turbine rotor 2 and a fourth magnetic component 44 disposed opposite to the third magnetic component 43 on the housing 1. The magnetic fields generated by the third magnetic component 43 and the fourth magnetic component 44 interact to suspend the turbine rotor 2 axially within the fluid channel 11; the second magnetic component 32 and / or the fourth magnetic component 44 are electromagnetic coils; the sensing end of the position sensor faces the turbine rotor, and the position sensor is communicatively connected to the electromagnetic coil through a control module. The control module controls the energizing current of the electromagnetic coil based on the sensing information from the position sensor. A speed detection component is disposed outside or inside the housing 1 to detect the speed of the turbine rotor 2 and output an electrical signal corresponding to the speed.

[0040] Specifically, the rotational speed detection component can be any one of photoelectric, capacitive, ultrasonic, Hall effect, or magnetoelectric induction detection components. When using a Hall effect or magnetoelectric induction detection component, the axial length of the turbine rotor 2 can be appropriately increased to separate the magnetic fields generated by the radial suspension assembly 3 and the axial suspension assembly 4 from the magnetic field for flow velocity detection.

[0041] The radial suspension component provides a uniform radial centering force to the turbine rotor 2, precisely constraining its radial displacement and preventing radial deviation and contact with the pipe wall. The axial suspension component provides a symmetrical axial positioning force, limiting the axial movement of the turbine rotor 2 and preventing it from colliding with the pipe end wall. Together, they form a comprehensive magnetic field constraint, allowing the turbine rotor 2 to be completely suspended without contact or support without any mechanical support or limiting components. This completely eliminates the contact friction caused by residual support in existing magnetic levitation schemes, increasing the optimal detection range of the turbine flow meter. It enables accurate detection of the flow velocity of low-velocity fluids, solving the problems of excessive frictional resistance and rotor inability to start smoothly at low flow rates. It also solves the problem of increased fluid pressure loss caused by changing the diameter of the fluid channel 11. At the same time, the unsupported structure completely eliminates fluid obstruction caused by internal support components, ensuring unobstructed flow and minimizing pressure loss during fluid flow. This avoids measurement errors caused by excessive pressure loss and improves the measurement reliability of the flow meter.

[0042] The static magnetic field provided by the permanent magnet is a passive magnetic field, with its magnetic field strength and polarity fixed, generating a stable reference magnetic field solely through its inherent magnetism. The electromagnetic field formed by passing a controllable current through the electromagnetic coil is an active magnetic field, whose strength and direction can be adjusted in real time by the current. Based on Enshao's theorem, a single static magnetic field cannot form stable levitation. This invention sets a second and / or fourth magnetic component as an electromagnetic coil to add an active magnetic field. A position sensor monitors the displacement of the turbine rotor in real time, and the control module quickly adjusts the coil current according to the displacement deviation, changing the strength of the active magnetic field. By precisely balancing gravity and external force disturbances through the active magnetic field, the turbine rotor 2 achieves stable magnetic levitation.

[0043] The combination of radial and axial suspension components forms a three-dimensional magnetic field constraint system, which can balance various external forces such as the gravity of the turbine rotor 2 itself and fluid impact force in real time. It effectively compensates for the displacement of the turbine rotor 2 caused by factors such as fluid disturbance and equipment vibration, ensuring that the turbine rotor 2 is always stably suspended in the center of the flow channel without tilting, shaking or colliding. It solves the pain point of unstable suspension and easy displacement caused by only a single direction magnetic field support in the existing magnetic levitation scheme, and is suitable for various complex metering conditions such as low flow rate, high flow rate, and high pressure.

[0044] The following describes the implementation of the magnetic levitation turbine flow meter provided by the present invention:

[0045] Example 1

[0046] like Figure 1As shown, the magnetic levitation turbine flow meter includes: a housing 1, with a through fluid channel 11 inside the housing 1; a turbine rotor 2, coaxially disposed within the fluid channel 11; the turbine rotor 2 includes a support portion 21 and an impeller portion 22, with the impeller portion 22 fixedly disposed on the support portion 21. The support portion 21 is an annular support portion 211, and the impeller portion 22 is composed of several blades. Preferably, the impeller portion 22 is composed of four blades, which are evenly arranged along the annular support portion 211. One end of each blade is fixed to the inner wall of the annular support portion 211, and the other end extends radially inward along the annular support portion 211. The free ends of each blade are close to each other but do not contact each other.

[0047] In order to coaxially position the turbine rotor 2 within the fluid channel 11 in the housing 1, and to ensure that the cross-sectional area of ​​the medium flowing into the magnetic levitation turbine flow meter within the test tube remains as constant as possible; for example Figure 1 As shown, an annular limiting cavity 12 is recessed into the inner wall of the housing 1. The annular support portion 211 of the turbine rotor 2 is embedded in the annular limiting cavity 12. The inner diameter of the annular support portion 211 is consistent with the diameter of the fluid channel 11 of the housing 1. This ensures that the inner wall of the fluid channel 11 is smooth and without protrusions, guaranteeing unobstructed flow throughout the channel and eliminating any structures that hinder fluid flow, thereby minimizing pressure loss.

[0048] The magnetic levitation turbine flow meter is equipped with a radial suspension component 3 to make the turbine rotor 2 radially levitate in the fluid channel 11. The radial suspension component 3 includes a first magnetic component 31 disposed on the turbine rotor 2 and a second magnetic component 32 embedded in the housing wall.

[0049] Specifically, the first magnetic component 31 consists of two identical inner radial annular magnets 311, each having an N-pole ring and an S-pole ring that are radially magnetized, such as... Figure 1 As shown, the polarities of the inner radial annular magnets 311 are respectively oriented towards the inner and outer annular surfaces, i.e., the inner ring is the N pole and the outer ring is the S pole; or the inner ring is the S pole and the outer ring is the N pole. Both inner radial annular magnets 311 are circumferentially embedded in the annular support portion 211 of the turbine rotor 2, and are positioned close to both ends of the annular support portion 211, mirror-symmetrically along the mid-section of the annular support portion 211. The second magnetic component 32, opposite to the first magnetic component 31, is an outer radial electromagnetic coil group 321 arranged circumferentially around the central axis of the turbine rotor 2. Both outer radial electromagnetic coil groups 321 are circumferentially embedded in the housing wall at the annular limiting cavity 12, and are radially opposite to the two inner radial annular magnets 311. Each electromagnetic coil in the outer radial electromagnetic coil group 321 is communicatively connected to the control module of the magnetic levitation turbine flowmeter.

[0050] The magnetic levitation turbine flow meter has several position sensors arranged circumferentially around the central axis of the turbine rotor 2, with the sensing end of the position sensor facing the turbine rotor 2. The position sensor is connected to the electromagnetic coil through the control module. The position sensor can monitor whether the turbine rotor 2 is coaxial with the fluid channel 11, that is, monitor the radial displacement of the turbine rotor 2, and transmit the monitored position information to the control module. The control module controls the current of each electromagnetic coil in the outer radial electromagnetic coil group 321 according to the position information of the position sensor, thereby changing the magnetic field of each electromagnetic coil in the outer radial electromagnetic coil group 321. The magnetic field generated by the inner radial annular magnet 311 and the magnetic field generated by the outer radial electromagnetic coil group 321 interact, so that the turbine rotor 2 is radially suspended in the fluid channel 11.

[0051] In other embodiments, the first magnetic component 31 may be a ring-shaped magnet formed by splicing together multiple magnets.

[0052] The magnetic levitation turbine flow meter is equipped with an axial suspension component 4 to axially suspend the turbine rotor 2 in the fluid channel 11. The axial suspension component 4 includes a third magnetic component 43 disposed at the end of the turbine rotor 2 and a fourth magnetic component 44 embedded in the housing wall.

[0053] Specifically, the third magnetic component 43 consists of two identical inner axial annular magnets 431. Each inner axial annular magnet 431 has an axially magnetized N-pole and an S-pole. Both inner axial annular magnets 431 are coaxially embedded at both ends of the annular support portion 211 and are mirror-symmetrical along the mid-section of the annular support portion 211. The fourth magnetic component 44, opposite to the third magnetic component 43, consists of two identical outer axial annular magnets 441. Each outer axial annular magnet 441 has an axially magnetized N-pole and an S-pole. Both outer axial annular magnets 441 are circumferentially embedded in the housing wall of the annular limiting cavity 12, and are axially opposite to the two inner axial annular magnets 431, with the same poles of the outer axial annular magnets 441 facing each other. The magnetic fields generated by the inner axial annular magnets 431 at both ends of the annular support portion 211 interact with the magnetic fields generated by the opposite outer axial annular magnets 441, creating a repulsive force that axially suspends the turbine rotor 2 in the fluid channel 11.

[0054] In other embodiments, the third magnetic component 43 may be a ring-shaped magnet formed by splicing together multiple magnets; the fourth magnetic component 44 may also be a ring-shaped magnet formed by splicing together multiple magnets.

[0055] During assembly, the first magnetic component 31 and the third magnetic component 43 are first installed in the corresponding positions of the turbine rotor 2, and the second magnetic component 32 and the fourth magnetic component 44 are installed in the corresponding positions of the housing 1. Then, the turbine rotor 2 with the magnetic components is placed in the annular limiting cavity 12 of the housing 1, and the annular support part 211 of the turbine rotor 2 is embedded in the annular limiting cavity 12 through the end cover flange of the housing 1. Under the combined action of the radial suspension component 3 and the axial suspension component 4, the turbine rotor 2 is stably suspended in the fluid channel 11 of the housing 1.

[0056] Example 2

[0057] The difference between this embodiment and embodiment 1 lies in the position of the second magnetic component 32 in the radial suspension assembly 3 or the position of the fourth magnetic component 44 in the axial suspension assembly 4.

[0058] like Figure 2 As shown, when the housing wall is too thin to embed the second magnetic component 32 within the housing wall, the second magnetic component 32 can be disposed outside the housing 1, radially opposite to the first magnetic component 31 disposed on the turbine rotor 2. Specifically, two inner radial annular magnets 311 are circumferentially embedded in the annular support portion 211 of the turbine rotor 2, and the two inner radial annular magnets 311 are respectively disposed near both ends of the annular support portion 211, and are mirror-symmetrical along the mid-section of the annular support portion 211. Two outer radial electromagnetic coil groups 321 are circumferentially sleeved outside the housing at the annular limiting cavity 12, and the two outer radial electromagnetic coil groups 321 are radially opposite to the two inner radial annular magnets 311. Through the interaction of the magnetic field generated by the inner radial annular magnets 311 and the magnetic field generated by the outer radial electromagnetic coil groups 321, the turbine rotor 2 is radially suspended in the fluid channel 11.

[0059] Similarly, as Figure 3 As shown, the fourth magnetic component 44 can also be disposed outside the housing 1, axially opposite to the third magnetic component 43 disposed on the turbine rotor 2. Specifically, two inner axial annular magnets 431 are coaxially embedded at both ends of the annular support 211 and mirror-symmetrical along the mid-section of the annular support 211. Two outer axial annular magnets 441 are circumferentially sleeved outside the housing, and the two outer axial annular magnets 441 are axially opposite to the two inner axial annular magnets 431. With the same poles of the outer axial annular magnets 441 and the inner axial annular magnets 431 facing each other, the magnetic fields generated by the inner axial annular magnets 431 located at both ends of the annular support 211 interact with the magnetic fields generated by the outer axial annular magnets 441 disposed opposite to them. Through mutual repulsion, the turbine rotor 2 is axially suspended in the fluid channel 11.

[0060] Example 3

[0061] like Figure 4 As shown, the difference between this embodiment and embodiment 1 is that the radial suspension components 3 are all permanent magnets, the third magnetic component 43 in the axial suspension component 4 is a permanent magnet, the fourth magnetic component 44 is an electromagnetic coil, and the setting and monitoring information of the position sensor are different.

[0062] Specifically, the first magnetic component 31 consists of two identical inner radial annular magnets 311, each having an N-pole ring and an S-pole ring that are radially magnetized, such as... Figure 1 As shown, the polarities of the inner radial annular magnets 311 are respectively oriented towards the inner and outer annular surfaces, i.e., the inner ring is the N pole and the outer ring is the S pole; or the inner ring is the S pole and the outer ring is the N pole. Both inner radial annular magnets 311 are circumferentially embedded in the annular support portion 211 of the turbine rotor 2, and are positioned close to both ends of the annular support portion 211, mirror-symmetrical along the mid-section of the annular support portion 211. The second magnetic component 32, opposite to the first magnetic component 31, consists of two identical outer radial annular magnets 322. Each outer radial annular magnet 322 has an N pole ring and an S pole ring that are radially magnetized. Both outer radial annular magnets 322 are circumferentially embedded in the housing wall at the annular limiting cavity 12, and are radially opposite to the inner radial annular magnets 311. The opposing portions of the inner radial annular magnets 311 and outer radial annular magnets 322 are configured with the same magnetic poles. The magnetic field generated by the inner radial annular magnet 311 interacts with the magnetic field generated by the outer radial annular magnet 322, and through mutual repulsion, the turbine rotor 2 is radially suspended in the fluid channel 11.

[0063] In other embodiments, the first magnetic component 31 may be a ring-shaped magnet formed by splicing together multiple magnets; the second magnetic component 32 may also be a ring-shaped magnet formed by splicing together multiple magnets.

[0064] Specifically, the third magnetic component 43 consists of two identical inner axial annular magnets 431. Each inner axial annular magnet 431 has an axially magnetized N-end and S-end. Both inner axial annular magnets 431 are coaxially embedded at both ends of the annular support portion 211 and are mirror-symmetrical along the mid-section of the annular support portion 211. The fourth magnetic component 44, opposite to the third magnetic component 43, consists of two outer axial electromagnetic coil groups 442 arranged circumferentially around the central axis of the turbine rotor 2. Both outer axial electromagnetic coil groups 442 are circumferentially embedded in the housing wall at the annular limiting cavity 12, and are axially opposite to the two inner axial annular magnets 431. Each electromagnetic coil in the outer axial electromagnetic coil group 442 is communicatively connected to the control module of the magnetic levitation turbine flowmeter.

[0065] Position sensors are provided at both ends of the annular limiting cavity 12. The position sensors are arranged circumferentially around the central axis of the turbine rotor 2, and the sensing end of the position sensor is facing the turbine rotor 2. The position sensors are connected to the electromagnetic coils through the control module. The position sensors can monitor the axial displacement of the turbine rotor 2 and transmit the monitored position information to the control module. The control module controls the current of each electromagnetic coil in the outer axial electromagnetic coil group 442 according to the position information of the position sensor, thereby changing the magnetic field of each electromagnetic coil in the outer axial electromagnetic coil group 442. The magnetic field generated by the inner axial annular magnet 431 and the magnetic field generated by the outer axial electromagnetic coil group 442 interact, so that the turbine rotor 2 is axially suspended in the fluid channel 11.

[0066] In other embodiments, the third magnetic component 43 may be a ring-shaped magnet formed by splicing together multiple magnets.

[0067] Example 4

[0068] like Figure 5 As shown, the difference between this embodiment and embodiment 3 lies in the structure of the turbine rotor 2, as detailed below:

[0069] The turbine rotor 2 is coaxially disposed within the fluid channel 11. The turbine rotor 2 includes a support portion 21 and an impeller portion 22. The support portion 21 includes an annular support portion 211 and an inner support shaft 212 coaxially disposed within the annular support portion 211. The impeller portion 22 is disposed between the annular support portion 211 and the inner support shaft 212. The impeller portion 22 is composed of several blades; preferably, it consists of four blades. The blades are evenly arranged along the annular support portion 211, with one end fixed to the inner support shaft 212 and the other end extending radially outward along the inner support shaft 212 and fixed to the inner wall of the annular support portion 211.

[0070] Example 5

[0071] like Figure 6 As shown, this embodiment differs from Embodiment 1 in that the third magnetic component 43 in the axial suspension assembly 4 is a permanent magnet, the fourth magnetic component 44 is an electromagnetic coil, and the setting and monitoring information of the position sensor are different, as detailed below:

[0072] The first magnetic component 31 consists of two identical inner radial annular magnets 311. Each inner radial annular magnet 311 has an N-pole ring and an S-pole ring that are radially radiatively magnetized. The polarities of the inner radial annular magnets 311 are respectively arranged facing the inner and outer annular surfaces, i.e., the inner ring is the N-pole and the outer ring is the S-pole; or the inner ring is the S-pole and the outer ring is the N-pole. Both inner radial annular magnets 311 are circumferentially embedded in the annular support portion 211 of the turbine rotor 2, and are respectively located near both ends of the annular support portion 211, and are mirror-symmetrical along the mid-section of the annular support portion 211. The second magnetic component 32, which is arranged opposite to the first magnetic component 31, consists of two outer radial electromagnetic coil groups 321 arranged circumferentially around the central axis of the turbine rotor 2. Both outer radial electromagnetic coil groups 321 are circumferentially embedded in the housing wall at the annular limiting cavity 12, and are radially opposite to the two inner radial annular magnets 311. Each electromagnetic coil in the outer radial electromagnetic coil group 321 is communicatively connected to the control module of the magnetic levitation turbine flow meter.

[0073] In other embodiments, the first magnetic component 31 may be a ring-shaped magnet formed by splicing together multiple magnets.

[0074] The third magnetic component 43 consists of two identical inner axial annular magnets 431. Each inner axial annular magnet 431 has an axially magnetized N-end and S-end. Both inner axial annular magnets 431 are coaxially embedded at both ends of the annular support portion 211 and are mirror-symmetrical along the mid-section of the annular support portion 211. The fourth magnetic component 44, opposite to the third magnetic component 43, consists of two outer axial electromagnetic coil groups 442 arranged circumferentially around the central axis of the turbine rotor 2. Both outer axial electromagnetic coil groups 442 are circumferentially embedded in the housing wall at the annular limiting cavity 12, and are axially opposite to the two inner axial annular magnets 431. Each electromagnetic coil in the outer axial electromagnetic coil group 442 is communicatively connected to the control module of the magnetic levitation turbine flowmeter.

[0075] In other embodiments, the third magnetic component 43 may be a ring-shaped magnet formed by splicing together multiple magnets.

[0076] Position sensors are provided at both ends of the annular limiting cavity 12. The position sensors are arranged circumferentially around the central axis of the turbine rotor 2, and the sensing end of the position sensor faces the turbine rotor 2. The position sensors are connected to the electromagnetic coils through the control module. The position sensors can monitor the radial and axial displacements of the turbine rotor 2 and transmit the monitored position information to the control module. The control module controls the current of each electromagnetic coil in the outer radial electromagnetic coil group 321 according to the radial position information of the position sensor, thereby changing the magnetic field of each electromagnetic coil in the outer radial electromagnetic coil group 321. The magnetic field generated by the inner radial annular magnet 311 and the magnetic field generated by the outer radial electromagnetic coil group 321 interact, so that the turbine rotor 2 is radially suspended in the fluid channel 11. The control module controls the current of each electromagnetic coil in the outer axial electromagnetic coil group 442 according to the axial position information of the position sensor, thereby changing the magnetic field of each electromagnetic coil in the outer axial electromagnetic coil group 442. The magnetic field generated by the inner axial annular magnet 431 and the magnetic field generated by the outer axial electromagnetic coil group 442 interact, so that the turbine rotor 2 is axially suspended in the fluid channel 11.

[0077] The control module uses position sensors to detect the axial and radial displacement deviations of the turbine rotor 2 in real time. Based on the displacement deviation, it quickly adjusts the current of each coil and dynamically changes the strength and magnitude of the active magnetic field in each direction. This ensures that the electromagnetic force on the turbine rotor 2 is always balanced with gravity and external disturbances, thus stably constraining the rotor to the center position and achieving non-contact magnetic levitation of the turbine rotor 2 in all directions.

[0078] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A magnetic levitation turbine flow meter, characterized in that, include: The housing (1) has a through fluid channel (11) inside. Turbine rotor (2), which is coaxially disposed within the fluid channel (11); The radial suspension assembly (3) includes a first magnetic component (31) disposed on the turbine rotor (2) and a second magnetic component (32) disposed opposite to the first magnetic component (31) outside the fluid channel (11). The magnetic field generated by the first magnetic component (31) and the magnetic field generated by the second magnetic component (32) interact with each other, so that the turbine rotor (2) is radially suspended in the fluid channel (11). The axial suspension assembly (4) includes a third magnetic component (43) disposed at the end of the turbine rotor (2) and a fourth magnetic component (44) disposed on the housing (1) relative to the third magnetic component (43). The magnetic field generated by the third magnetic component (43) and the magnetic field generated by the fourth magnetic component (44) interact to make the turbine rotor (2) axially suspended in the fluid channel (11). The second magnetic component (32) and / or the fourth magnetic component (44) are electromagnetic coils; A position sensor is provided, with its sensing end facing the turbine rotor. The position sensor is connected to an electromagnetic coil via a control module, and the control module controls the current flowing through the electromagnetic coil based on the sensing information from the position sensor.

2. The magnetic levitation turbine flow meter according to claim 1, characterized in that, The first magnetic component (31) and the third magnetic component (43) are permanent magnets.

3. The magnetic levitation turbine flow meter according to claim 1, characterized in that, The second magnetic component (32) is located outside the housing (1) or inside the housing wall.

4. The magnetic levitation turbine flow meter according to claim 1, characterized in that, The turbine rotor (2) includes a support part (21) and an impeller part (22). The impeller part (22) is fixedly disposed on the support part (21), and the first magnetic component (31) is disposed on the support part (21).

5. The magnetic levitation turbine flow meter according to claim 4, characterized in that, The support part (21) includes an annular support part (211), one end of the impeller part (22) is fixed to the inner wall of the annular support part (211), and the other end extends inward along the radial direction of the annular support part (211). The first magnetic component (31) is disposed on the annular support part (211).

6. The magnetic levitation turbine flow meter according to claim 5, characterized in that, The support part (21) also includes an inner support shaft (212) coaxially disposed in the annular support part (211). One end of the impeller part (22) is fixed on the inner support shaft (212), and the other end extends radially outward along the inner support shaft (212) to the inner wall of the annular support part (211).

7. The magnetic levitation turbine flow meter according to claim 5 or 6, characterized in that, The inner wall of the housing (1) is recessed with an annular limiting cavity (12), and the annular support part (211) of the turbine rotor (2) is embedded in the annular limiting cavity (12).

8. The magnetic levitation turbine flow meter according to claim 7, characterized in that, The inner wall diameter of the annular support (211) is the same as the diameter of the fluid channel (11) of the shell (1).

9. The magnetic levitation turbine flow meter according to claim 8, characterized in that, The first magnetic component (31) is embedded in the annular support portion (211), and the second magnetic component (32) is embedded in the shell wall at the annular limiting cavity (12) relative to the first magnetic component (31).

10. The magnetic levitation turbine flow meter according to claim 9, characterized in that, The third magnetic component (43) is disposed at the axial end of the annular support (211), and the fourth magnetic component (44) is embedded in the housing wall at the annular limiting cavity (12) relative to the third magnetic component (43).

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