CN114109844A - Magnetic suspension centrifugal pump applied to ultra-pure water transportation - Google Patents
Magnetic suspension centrifugal pump applied to ultra-pure water transportation Download PDFInfo
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- CN114109844A CN114109844A CN202111611620.5A CN202111611620A CN114109844A CN 114109844 A CN114109844 A CN 114109844A CN 202111611620 A CN202111611620 A CN 202111611620A CN 114109844 A CN114109844 A CN 114109844A
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- 239000000725 suspension Substances 0.000 title claims abstract description 30
- 229910021642 ultra pure water Inorganic materials 0.000 title claims abstract description 28
- 239000012498 ultrapure water Substances 0.000 title claims abstract description 28
- 238000004804 winding Methods 0.000 claims abstract description 92
- 238000006073 displacement reaction Methods 0.000 claims abstract description 42
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 9
- 230000005674 electromagnetic induction Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 239000011538 cleaning material Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000005339 levitation Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 241000254173 Coleoptera Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 150000008040 ionic compounds Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
- F04D13/064—Details of the magnetic circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
- F04D29/242—Geometry, shape
- F04D29/245—Geometry, shape for special effects
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a magnetic suspension centrifugal pump applied to ultra-pure water transportation, which comprises a pump shell, a rotor and a stator, wherein the pump shell is provided with a plurality of through holes; the stator comprises an iron core, a first winding coil and a second winding coil; the six iron cores are all arranged perpendicular to the bottom surface of the pump shell; each iron core is wound with a first winding coil and a second winding coil; three-phase current is introduced into the winding coil I and the winding coil II, so that the rotor can be suspended and rotated in the pump shell; the rotating speed of the rotor is detected through a Hall angle sensor, the radial displacement of the rotor is detected through an eddy current displacement sensor, the frequency and the amplitude of the three-phase current in the first winding coil are mainly changed, and the frequency and the amplitude of the three-phase current in the second winding coil are changed in an auxiliary mode, so that the offset and the deflection generated by the rotor are eliminated; the rotor, the pump shell and the pump end cover are made of cleaning materials so as to reduce the pollution to the ultrapure water transportation process; the performance of the impeller is improved by arranging the micro-structures on the blades of the impeller. The invention has simple structure and is more efficient and reliable when transporting ultrapure water.
Description
Technical Field
The invention relates to the technical field of magnetic suspension, in particular to a magnetic suspension centrifugal pump applied to ultrapure water transportation.
Background
The magnetic suspension pump adopts a magnetic bearing as a rotor support, and has obvious application advantages in the fields of biology, chemistry, medical semiconductor manufacturing and the like with extremely high requirements on material purity. In the working process of the traditional centrifugal pump, because the rotor and the stator are in mechanical contact, the bearing cannot be sealed, has abrasion and needs to be maintained regularly, the service life is seriously influenced, and more importantly, the working fluid can be irreversibly polluted; therefore, centrifugal pumps with high rotational speed and high power performance are needed in many fields. Because the rotor of the magnetic suspension pump is suspended by the force generated by the arc magnetic sheets and the electromagnet, the rotor is not in mechanical contact with the stator, the mass of the rotor is supported by magnetic force, the whole rotor is in a suspended state, and the magnetic suspension pump has the advantages of good sealing performance, no abrasion, easy improvement of rotating speed and the like, and is also applied more.
In addition, most of the magnetic suspension centrifugal pumps provided by the prior art are applied to the field of magnetic suspension artificial heart blood pumps, and the field of ultrapure water delivery is less involved; the difference of the conveying media of the magnetic suspension centrifugal pump can have great influence on the selection of materials and the structure of the magnetic pole, such as friction particles generated by the interaction between the materials and the media; the impeller is caused by stress damage to the conveying medium due to the structural design. Therefore, there is a need for a magnetic levitation centrifugal pump that can deliver ultrapure water, has high output efficiency, and does not contaminate water quality, so as to improve the delivery efficiency of ultrapure water.
Disclosure of Invention
In order to solve the problems, the invention provides a centrifugal pump which realizes impeller suspension and rotation by using a magnetic suspension technology, and improves the stability of a magnetic suspension pump while ensuring ultra-clean delivery of ultrapure water.
The invention relates to a magnetic suspension centrifugal pump applied to ultra-pure water transportation, which comprises a pump shell, a rotor and a stator, wherein the pump shell is provided with a plurality of through holes; the rotor comprises a rotor core, a first magnetic disk, a second magnetic disk, a circular arc magnetic sheet and an impeller; the first magnetic disk and the second magnetic disk are fixed at two ends of the rotor core; the plurality of arc-shaped magnetic sheets are uniformly distributed along the circumferential direction of the rotor core, and the upper parts and the lower parts of the arc-shaped magnetic sheets are respectively fixed on the outer edges of the first magnetic disk and the second magnetic disk; the impeller is fixed on the second magnetic disk; the rotor is arranged in the rotor seat; the rotor seat is fixed in the pump shell; the stator comprises an iron core, a first winding coil and a second winding coil; six iron cores are uniformly distributed and fixed in the pump shell along the circumferential direction of the pump shell; each iron core is wound with a first winding coil and a second winding coil; the second winding coil is wound at one end close to the rotor, and the first winding coil is wound at one end far away from the rotor; an isolation pad is arranged between the second winding coil and the first winding coil; the pump end cap covers the rotor base and is secured to the pump housing.
The six iron cores are opposite pairwise, and a pair of opposite iron cores are grouped into the same group; the first winding coil on the first group of iron cores is connected with the phase A current in the first three-phase current, the first winding coil on the second group of iron cores is connected with the phase B current in the first three-phase current, and the first winding coil on the third group of iron cores is connected with the phase C current in the first three-phase current; and the second winding coil on the first group of iron cores is connected with the phase A current in the second three-phase current, the second winding coil on the second group of iron cores is connected with the phase B current in the second three-phase current, and the second winding coil on the third group of iron cores is connected with the phase C current in the second three-phase current.
Preferably, when the first winding coils and the second winding coils on the six iron cores are electrified, the first winding coils and the second winding coils generate electromagnetic induction, a magnetic path generated by the electromagnetic induction passes through the arc-shaped magnetic sheet in the rotor, so that the rotor is suspended in the rotor seat, and the arc-shaped magnetic sheet is subjected to tangential lorentz force to drive the rotor to rotate.
Preferably, the process that the rotor is suspended above the preset height position under the action of the magnetic field is as follows:
when the component force Fz of the magnetic pulling force F generated by the stator to the rotor along the direction of the vertical axis z is larger than the gravity of the rotor, the rotor moves upwards, the included angle between the magnetic pulling force F generated by the stator to the rotor and the vertical axis z is gradually increased, and the component force Fz of the magnetic pulling force F generated by the stator to the rotor along the direction of the vertical axis z is gradually reduced; and the rotor maintains balance above the preset height position until the component force Fz of the magnetic pulling force F generated by the stator to the rotor along the vertical axis z direction is equal to the gravity of the rotor.
Preferably, the pump housing is internally fixed with three hall angle sensors uniformly distributed along the circumferential direction of the pump housing and three eddy current displacement sensors uniformly distributed along the circumferential direction of the pump housing.
More preferably, when the rotor is suspended above a preset height position and deflects relative to a horizontal plane xy, the component force of the magnetic pulling force F of the stator on the rotor along the axial direction of the rotor is increased, and the rotor rotates in the opposite direction of the deflection; the three eddy current displacement sensors detect the radial displacement of the rotor, and the three Hall angle sensors detect the rotating speed of the rotor and feed the rotating speed back to the controller; the controller calculates a radial displacement detection value and a rotating speed value of the central axis of the rotor relative to the central axis of the stator; if the rotor cannot return to the initial position due to the action of the fluid, the frequency and the amplitude of a three-phase current II connected with a winding coil II are mainly changed, and the frequency and the amplitude of a three-phase current I connected with the winding coil I are changed in an auxiliary mode, so that the magnetic tension F is increased, and the rotor is rotated to the return initial position in the opposite direction of deflection.
Preferably, the rotor core, the rotor base and the pump end cover are made of PVC materials; the impeller is made of PVDF material; the pump casing is made of aluminum.
Preferably, the pump end cover and the pump shell are both internally coated with corrosion-resistant coatings.
Preferably, a plurality of hemispherical pits are formed in the windward side of the blades in the impeller, and the hemispherical pits are arranged in an array; the depth of the hemispherical pits gradually decreases in the direction from the root to the tip of the blade.
More preferably, the leeward side of blade still sets up a plurality of rectangle recesses that the equidistance was arranged in the impeller, and the length of rectangle recess is arranged along blade chord length direction, and the degree of depth of rectangle recess is crescent along blade root to tip direction.
More preferably, the process of adjusting the motion state of the rotor through the first winding coil and the second winding coil is as follows:
three eddy current displacement sensors fixed inside the pump shell detect the radial displacement of the rotor, and three Hall angle sensors detect the rotating speed of the rotor and feed the rotating speed back to the controller; the controller calculates a radial displacement detection value and a rotating speed value of the central axis of the rotor relative to the central axis of the stator, and the rotating speed of the rotor is adjusted in a feedback manner mainly by changing the frequency and the amplitude of the three-phase current I connected with the winding coil I and assisting in adjusting the frequency and the amplitude of the three-phase current II connected with the winding coil II;
when the magnetic suspension centrifugal pump works, when the resultant force of the Maxwell force and the impact force of the ultrapure water flow is not zero along the horizontal component force, the rotor is radially offset; at the moment, the three eddy current displacement sensors detect the radial displacement of the rotor, and the three Hall angle sensors detect the rotating speed of the rotor and feed the rotating speed back to the controller; the controller calculates a radial displacement detection value and a rotating speed value of the central axis of the rotor relative to the central axis of the stator, mainly changes the frequency and the amplitude of the two-phase current connected with the winding coil II, and assists in changing the frequency and the amplitude of the three-phase current connected with the winding coil I, so that a magnetic field generates Maxwell force opposite to the current radial displacement direction of the rotor, and the rotor returns to the position coaxial with the stator under the action of the Maxwell force.
The invention has the beneficial effects that:
according to the invention, the three-phase current is introduced into the winding coil I and the winding coil II, so that the rotor can be suspended and rotated in the pump shell; detecting the rotating speed of the rotor through a Hall angle sensor, detecting the radial displacement of the rotor through an eddy current displacement sensor, and then, mainly changing the frequency and the amplitude of the three-phase current in the first winding coil and auxiliarily changing the frequency and the amplitude of the three-phase current in the second winding coil so as to eliminate the offset and the deflection generated by the rotor; the rotor, the pump shell and the pump end cover are made of cleaning materials, so that the pollution to the ultrapure water transportation process is reduced; the performance of the impeller is improved by arranging the micro-structures on the blades of the impeller. The invention has simple structure and is more efficient and reliable when transporting ultrapure water.
Drawings
FIG. 1 is a force analysis diagram of Lorentz force and Maxwell force applied to a rotor according to the present invention;
FIG. 2 is a force analysis diagram of the present invention with rotor levitation and horizontal position deflection;
FIG. 3 is a cross-sectional view of the overall construction of the present invention;
FIG. 4 is a partial cross-sectional view of a rotor of the present invention;
FIG. 5 is a schematic view of hemispherical pits and rectangular grooves on the surface of an impeller blade according to the present invention;
FIG. 6 is a schematic view of the structure of the impeller of the present invention;
fig. 7 is a schematic view showing an assembly relationship of a stator, a rotor, a hall angle sensor and an eddy current displacement sensor according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to a magnetic suspension centrifugal pump applied to ultra-pure water transportation, which comprises a pump shell, a rotor and a stator, as shown in figures 3 and 4; the rotor comprises a rotor core, a first magnetic disk 2, a second magnetic disk 3, a circular arc magnetic sheet 6 and an impeller 4; the first magnetic disk 2 and the second magnetic disk 3 are fixed at two ends of the rotor core; the four arc-shaped magnetic sheets 6 are uniformly distributed along the circumferential direction of the rotor core, and the upper parts and the lower parts of the arc-shaped magnetic sheets 6 are respectively fixed on the outer edges of the first magnetic disk 2 and the second magnetic disk 3; the impeller 4 is fixed on the second magnetic disk 3; the rotor is arranged in the rotor seat 1; the rotor seat 1 is fixed inside the pump shell; the stator comprises an iron core 7, a first winding coil 9 (a driving winding coil) and a second winding coil 8 (a suspension winding coil); six iron cores 7 are uniformly distributed and fixed in the pump shell along the circumferential direction of the pump shell; a first winding coil 9 and a second winding coil 8 are wound on each iron core 7; a second winding coil 8 is wound at one end close to the rotor, and a first winding coil 9 is wound at one end far away from the rotor; an isolation pad is arranged between the second winding coil 8 and the first winding coil 9; the pump end cover 5 covers the rotor base 1 and is fixed to the pump housing.
Every two of the six iron cores 7 are opposite, and the opposite pair of iron cores 7 are grouped into the same group; a first winding coil 9 on the first group of iron cores 7 is connected to the phase A current in the first three-phase current, a first winding coil 9 on the second group of iron cores 7 is connected to the phase B current in the first three-phase current, and a first winding coil 9 on the third group of iron cores 7 is connected to the phase C current in the first three-phase current; the second 8 winding coil on the first group of iron core 7 is connected to the phase A current in the second three-phase current, the second 8 winding coil on the second group of iron core 7 is connected to the phase B current in the second three-phase current, and the second 8 winding coil on the third group of iron core 7 is connected to the phase C current in the second three-phase current.
As a preferred embodiment, when the first winding coil 9 and the second winding coil 8 on the six iron cores 7 are both energized, as shown in fig. 1 (a), the first winding coil 9 and the second winding coil 8 generate electromagnetic induction, and a magnetic path generated by the electromagnetic induction passes through the arc-shaped magnetic sheet 6 in the rotor, so that the rotor can be suspended in the rotor base 1, and the arc-shaped magnetic sheet is subjected to tangential lorentz force to drive the rotor to rotate.
As a preferred embodiment, the process that the rotor is suspended above the preset height position under the action of the magnetic field is as follows:
as shown in fig. 2 (a), when a component Fz (component Fr in the horizontal direction) of the magnetic pulling force F generated by the stator on the rotor along the vertical axis z direction is greater than the gravity of the rotor, the rotor moves upwards, an included angle between the magnetic pulling force F generated by the stator on the rotor and the vertical axis z becomes larger gradually, and a component Fz of the magnetic pulling force F generated by the stator on the rotor along the vertical axis z direction becomes smaller gradually; when the component force Fz of the magnetic pulling force F generated by the stator to the rotor along the vertical axis z direction is equal to the gravity of the rotor, the rotor maintains balance above a preset height position; if the rotor is impacted by a large amount of fluid, the magnetic pulling force F is changed to incline downwards when the rotor moves upwards too much, and the rotor is pulled back to be close to the preset height position.
As a preferred embodiment, as shown in fig. 7, three hall angle sensors 11 uniformly distributed along the circumferential direction of the pump housing and three eddy current displacement sensors 10 uniformly distributed along the circumferential direction of the pump housing are fixed inside the pump housing; the Hall angle sensor 11 is used for detecting the rotating speed of the rotor; the eddy current displacement sensor 10 is used to detect the radial displacement of the rotor. The power supply for generating the three-phase current I and the three-phase current II is connected with the controller and is controlled by the controller; the signal output ends of the Hall angle sensor and the eddy current displacement sensor are connected with the controller.
As a more preferable embodiment, as shown in (b) of fig. 2, when the rotor is suspended above a preset height position and has a deflection relative to a horizontal plane xy, the component force of the stator to the rotor magnetic pulling force F along the axial direction of the rotor is increased, and the rotor is rotated in the opposite direction of the deflection; the three eddy current displacement sensors detect the radial displacement of the rotor, and the three Hall angle sensors 11 detect the rotating speed of the rotor and feed the rotating speed back to the controller; the controller calculates a radial displacement detection value and a rotating speed value of the central axis of the rotor relative to the central axis of the stator (for example, the radial displacement detection value and the rotating speed value can be obtained by calculating an average value of rotating speeds detected by the three hall angle sensors 11); if the rotor cannot return to the initial position due to the action of the fluid, the frequency and the amplitude of a three-phase current II connected with a winding coil II 8 are mainly changed, and the frequency and the amplitude of a three-phase current I connected with a winding coil I9 are changed in an auxiliary mode, so that the magnetic tension F is increased, the rotor is rotated to the return initial position in the direction opposite to the deflection direction, the rotor can be kept above a preset height position in a magnetic field stably and does not deflect, the center distance between the rotor and a stator is ensured to be within a threshold value, and the difference value between the rotor speed and the preset value is within the threshold value.
As a preferred embodiment, the rotor core, the rotor seat 1 and the pump end cover 5 are made of PVC materials, and the PVC materials are low in price and economical; the impeller 4 is made of PVDF material, the PVDF material has no additive, no ionic compound is precipitated, and the pollution to ultrapure water is small; the pump casing is made of aluminum.
As a preferred embodiment, both the pump end cap 5 and the pump housing interior are coated with a corrosion-resistant coating.
As a preferred embodiment, as shown in fig. 5 and 6, a plurality of hemispherical concave pits are formed on the windward side of the blades in the impeller 4; the semispherical pits imitate dung beetle body surface pits, and the depth of the semispherical pits is gradually reduced along the direction from the root part to the tip part of the blade; as shown in fig. 5 (a), the hemispherical pits have a diameter d; the distance between the adjacent hemispherical pits along the chord length direction of the blade is a; the distance between adjacent hemispherical pits is b along the axial direction of the impeller; the depth of the hemispherical pits closest to the root of the blade is h. And the specific values of the parameters are reasonably adjusted according to different working conditions so as to increase the adaptability of the microstructure.
As a more preferable embodiment, the leeward surface of the blade in the impeller 4 is further provided with a plurality of rectangular grooves which are arranged at equal intervals, the lengths of the rectangular grooves are arranged along the chord length direction of the blade, and the depths of the rectangular grooves are gradually increased along the direction from the root part to the tip part of the blade; as shown in fig. 5 (b), the width of the rectangular groove is l, the minimum depth of the rectangular groove is h1, the maximum depth is h2, and the distance between adjacent rectangular grooves is e; the rectangular grooves cause less resistance to the flow of liquid past the vanes of the impeller 4.
As a more preferred embodiment, the process of adjusting the motion state of the rotor through the first winding coil 9 and the second winding coil 8 is as follows:
three eddy current displacement sensors 10 fixed inside the pump shell detect the radial displacement of the rotor, and three Hall angle sensors 11 detect the rotating speed of the rotor and feed back the rotating speed to the controller; the controller calculates a radial displacement detection value and a rotating speed value of the central axis of the rotor relative to the central axis of the stator, and the rotating speed of the rotor is adjusted in a feedback mode mainly by changing the frequency and the amplitude of the first three-phase current connected with the first winding coil 9 and assisting in adjusting the frequency and the amplitude of the second three-phase current connected with the second winding coil 8, and the center distance between the rotor and the stator is within a threshold value.
When the magnetic suspension centrifugal pump works, a large amount of ultrapure water flows through the rotor, and the impact force of water flow can affect the motion state of the rotor; as shown in fig. 1 (c), when the resultant force of the maxwell force (the magnetic field in the magnetic circuit, the tension on the rotor surface due to the interaction between the iron core and the medium with different magnetic permeability, such as air, is in the direction perpendicular to the rotor surface and outward) and the impact force of the water flow is not zero along the horizontal component force, the rotor is radially offset, and at this time, the magnetic flow paths are distributed unevenly along the circumferential direction of the air gap, and the air gap is asymmetric; the three eddy current displacement sensors 10 detect the radial displacement of the rotor, and the three Hall angle sensors 11 detect the rotating speed of the rotor and feed the rotating speed back to the controller; the controller calculates a radial displacement detection value and a rotating speed value of the central axis of the rotor relative to the central axis of the stator, mainly changes the frequency and the amplitude of a three-phase current II connected with a winding coil II 8, and assists in changing the frequency and the amplitude of a three-phase current I connected with a winding coil I9, so that a magnetic field generates Maxwell force opposite to the current radial displacement direction of the rotor, the rotor returns to the position coaxial with the stator under the action of the Maxwell force, and the difference value between the rotating speed of the rotor and a preset value is ensured to be within a threshold value; as shown in fig. 1 (b), the magnetic flux paths are uniformly distributed in the circumferential direction of the air gap.
Wherein the Maxwell force F per unit area of the rotor surfacefThe following formula is satisfied:
in the formula, B is magnetic induction, μ 0 is vacuum magnetic permeability, and S is effective magnetic induction cross-sectional area.
Claims (10)
1. The utility model provides a be applied to magnetic suspension centrifugal pump of ultrapure water transportation, includes pump casing, rotor and stator, its characterized in that: the rotor comprises a rotor core, a first magnetic disk, a second magnetic disk, a circular arc magnetic sheet and an impeller; the first magnetic disk and the second magnetic disk are fixed at two ends of the rotor core; the plurality of arc-shaped magnetic sheets are uniformly distributed along the circumferential direction of the rotor core, and the upper parts and the lower parts of the arc-shaped magnetic sheets are respectively fixed on the outer edges of the first magnetic disk and the second magnetic disk; the impeller is fixed on the second magnetic disk; the rotor is arranged in the rotor seat; the rotor seat is fixed in the pump shell; the stator comprises an iron core, a first winding coil and a second winding coil; six iron cores are uniformly distributed and fixed in the pump shell along the circumferential direction of the pump shell; each iron core is wound with a first winding coil and a second winding coil; the second winding coil is wound at one end close to the rotor, and the first winding coil is wound at one end far away from the rotor; an isolation pad is arranged between the second winding coil and the first winding coil; the pump end cover covers the rotor seat and is fixed on the pump shell;
the six iron cores are opposite pairwise, and a pair of opposite iron cores are grouped into the same group; the first winding coil on the first group of iron cores is connected with the phase A current in the first three-phase current, the first winding coil on the second group of iron cores is connected with the phase B current in the first three-phase current, and the first winding coil on the third group of iron cores is connected with the phase C current in the first three-phase current; and the second winding coil on the first group of iron cores is connected with the phase A current in the second three-phase current, the second winding coil on the second group of iron cores is connected with the phase B current in the second three-phase current, and the second winding coil on the third group of iron cores is connected with the phase C current in the second three-phase current.
2. The magnetic suspension centrifugal pump applied to ultrapure water transportation according to claim 1 is characterized in that: when the first winding coil and the second winding coil on the six iron cores are electrified, the first winding coil and the second winding coil generate electromagnetic induction, a magnetic path generated by the electromagnetic induction passes through the arc-shaped magnetic sheet in the rotor, so that the rotor is suspended in the rotor seat, and the arc-shaped magnetic sheet is subjected to tangential Lorentz force to drive the rotor to rotate.
3. The magnetic suspension centrifugal pump applied to ultrapure water transportation according to claim 1 is characterized in that: the process that the rotor is suspended above the preset height position under the action of the magnetic field is as follows:
when the component force Fz of the magnetic pulling force F generated by the stator to the rotor along the direction of the vertical axis z is larger than the gravity of the rotor, the rotor moves upwards, the included angle between the magnetic pulling force F generated by the stator to the rotor and the vertical axis z is gradually increased, and the component force Fz of the magnetic pulling force F generated by the stator to the rotor along the direction of the vertical axis z is gradually reduced; and the rotor maintains balance above the preset height position until the component force Fz of the magnetic pulling force F generated by the stator to the rotor along the vertical axis z direction is equal to the gravity of the rotor.
4. The magnetic suspension centrifugal pump applied to ultrapure water transportation according to claim 1 is characterized in that: the pump casing inside be fixed with along the three hall angle sensor of pump casing circumference equipartition and along the three eddy current displacement sensor of pump casing circumference equipartition.
5. The magnetic suspension centrifugal pump applied to ultrapure water transportation according to claim 4, is characterized in that: when the rotor is suspended above a preset height position and deflects relative to a horizontal plane xy, the component force of the magnetic pulling force F of the stator on the rotor along the axial direction of the rotor is increased, and the rotor rotates in the opposite direction of the deflection; the three eddy current displacement sensors detect the radial displacement of the rotor, and the three Hall angle sensors detect the rotating speed of the rotor and feed the rotating speed back to the controller; the controller calculates a radial displacement detection value and a rotating speed value of the central axis of the rotor relative to the central axis of the stator; if the rotor cannot return to the initial position due to the action of the fluid, the frequency and the amplitude of a three-phase current II connected with a winding coil II are mainly changed, and the frequency and the amplitude of a three-phase current I connected with the winding coil I are changed in an auxiliary mode, so that the magnetic tension F is increased, and the rotor is rotated to the return initial position in the opposite direction of deflection.
6. The magnetic suspension centrifugal pump applied to ultrapure water transportation according to claim 1 is characterized in that: the rotor core, the rotor base and the pump end cover are all made of PVC materials; the impeller is made of PVDF material; the pump casing is made of aluminum.
7. The magnetic suspension centrifugal pump applied to the transportation of the ultrapure water is characterized in that: the pump end cover and the pump shell are both coated with corrosion-resistant coatings.
8. The magnetic suspension centrifugal pump applied to the transportation of the ultrapure water is characterized in that: the windward side of the blades in the impeller is provided with a plurality of hemispherical pits which are arranged in an array; the depth of the hemispherical pits gradually decreases in the direction from the root to the tip of the blade.
9. The magnetic suspension centrifugal pump applied to ultrapure water transportation according to claim 8 is characterized in that: the leeward side of blade still sets up a plurality of rectangle recesses that the equidistance was arranged in the impeller, and the length of rectangle recess is arranged along blade chord length direction, and the degree of depth of rectangle recess is crescent along blade root to point portion direction.
10. The magnetic suspension centrifugal pump applied to ultrapure water transportation according to claim 4, is characterized in that: the process of adjusting the motion state of the rotor through the first winding coil and the second winding coil is as follows:
three eddy current displacement sensors fixed inside the pump shell detect the radial displacement of the rotor, and three Hall angle sensors detect the rotating speed of the rotor and feed the rotating speed back to the controller; the controller calculates a radial displacement detection value and a rotating speed value of the central axis of the rotor relative to the central axis of the stator, and the rotating speed of the rotor is adjusted in a feedback manner mainly by changing the frequency and the amplitude of the three-phase current I connected with the winding coil I and assisting in adjusting the frequency and the amplitude of the three-phase current II connected with the winding coil II;
when the magnetic suspension centrifugal pump works, when the resultant force of the Maxwell force and the impact force of the ultrapure water flow is not zero along the horizontal component force, the rotor is radially offset, at the moment, the three eddy current displacement sensors detect the radial displacement of the rotor, and the three Hall angle sensors detect the rotating speed of the rotor and feed the rotating speed back to the controller; the controller calculates a radial displacement detection value and a rotating speed value of the central axis of the rotor relative to the central axis of the stator, mainly changes the frequency and the amplitude of the two-phase current connected with the winding coil II, and assists in changing the frequency and the amplitude of the three-phase current connected with the winding coil I, so that a magnetic field generates Maxwell force opposite to the current radial displacement direction of the rotor, and the rotor returns to the position coaxial with the stator under the action of the Maxwell force.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111611620.5A CN114109844A (en) | 2021-12-27 | 2021-12-27 | Magnetic suspension centrifugal pump applied to ultra-pure water transportation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111611620.5A CN114109844A (en) | 2021-12-27 | 2021-12-27 | Magnetic suspension centrifugal pump applied to ultra-pure water transportation |
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| CN114109844A true CN114109844A (en) | 2022-03-01 |
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| CN202111611620.5A Pending CN114109844A (en) | 2021-12-27 | 2021-12-27 | Magnetic suspension centrifugal pump applied to ultra-pure water transportation |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030193252A1 (en) * | 2001-06-14 | 2003-10-16 | Mohawk Innovative Technology, Inc. | Combination magnetic radial and thrust bearing |
| CN112160935A (en) * | 2020-10-22 | 2021-01-01 | 江苏大学 | Method for arranging pits of bionic twisted blades of centrifugal pump for noise reduction and blades |
| CN112343827A (en) * | 2020-10-27 | 2021-02-09 | 浙江大学 | Magnetic suspension pump with double-magnetic resistance structure |
| CN212690442U (en) * | 2020-07-17 | 2021-03-12 | 嘉善边锋泵业制造有限公司 | High-flow water pump impeller |
| CN113137373A (en) * | 2020-01-18 | 2021-07-20 | 浙江大学 | Magnetic suspension pump based on hydraulic balance principle |
| TW202138686A (en) * | 2020-04-10 | 2021-10-16 | 日商星光化工機股份有限公司 | Magnetic levitation-type pump |
-
2021
- 2021-12-27 CN CN202111611620.5A patent/CN114109844A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030193252A1 (en) * | 2001-06-14 | 2003-10-16 | Mohawk Innovative Technology, Inc. | Combination magnetic radial and thrust bearing |
| CN113137373A (en) * | 2020-01-18 | 2021-07-20 | 浙江大学 | Magnetic suspension pump based on hydraulic balance principle |
| TW202138686A (en) * | 2020-04-10 | 2021-10-16 | 日商星光化工機股份有限公司 | Magnetic levitation-type pump |
| CN212690442U (en) * | 2020-07-17 | 2021-03-12 | 嘉善边锋泵业制造有限公司 | High-flow water pump impeller |
| CN112160935A (en) * | 2020-10-22 | 2021-01-01 | 江苏大学 | Method for arranging pits of bionic twisted blades of centrifugal pump for noise reduction and blades |
| CN112343827A (en) * | 2020-10-27 | 2021-02-09 | 浙江大学 | Magnetic suspension pump with double-magnetic resistance structure |
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