CN115501794A - Magnetic stirrer using magnetic suspension technology - Google Patents
Magnetic stirrer using magnetic suspension technology Download PDFInfo
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- CN115501794A CN115501794A CN202211183314.0A CN202211183314A CN115501794A CN 115501794 A CN115501794 A CN 115501794A CN 202211183314 A CN202211183314 A CN 202211183314A CN 115501794 A CN115501794 A CN 115501794A
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- magnetic
- stirring shaft
- shaft
- end cover
- magnetic steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
- B01F33/453—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/22—Mixing of ingredients for pharmaceutical or medical compositions
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses a magnetic stirrer using magnetic suspension technology, which comprises: a drive shaft driven by a motor; one end of the stirring shaft is in non-contact transmission with the driving shaft; the other end of the stirring shaft is provided with a stirring impeller; the balance components are provided with two groups and are respectively arranged at two ends of the stirring shaft; the stirring shaft is arranged in the supporting component, and the supporting component is provided with a balance component in a positioning way. Through permanent magnetism suspension and electromagnetism suspension technique, realize the axial and the radial suspension of (mixing) shaft, through the indirect drive (mixing) shaft of drive shaft, have full suspension contactless, no mechanical wear, the interference killing feature is strong, easily control, advantages such as long service life.
Description
Technical Field
The invention relates to the technical field of magnetic suspension, in particular to a magnetic stirrer using a magnetic suspension technology.
Background
At present, in the process of developing and producing vaccine liquid medicine, a magnetic stirrer plays an important role. When the magnetic stirrer works in the liquid medicine, the magnetic stirrer needs to be in a sterile environment, and the liquid medicine cannot be polluted due to mechanical abrasion. There is therefore a need in the market for a magnetic stirrer which is easy to clean and free from frictional losses.
The magnetic suspension technology is a technology for suspending an object by using the principle that like poles of magnets repel and unlike poles of magnets attract. The magnetic suspension technology has the characteristics of no mechanical contact, low energy consumption, low maintenance cost and long service life, and the electromagnetic suspension technology has the advantages of active control and strong anti-interference capability.
The magnetic suspension automatic stirrer described in CN202424591U is radially supported by a sliding bearing. The radial support bearing is a passive bearing and cannot be actively controlled. Plain bearings require a lubricating medium and there is mechanical wear before a stable lubricating liquid film is formed, and their structural integrity can be compromised, affecting bearing performance. The motor of the stirrer is arranged between the two radial supporting bearings, so that the replacement of a lubricating medium of the stirrer and the cleaning of a motor rotor shafting are not facilitated.
Therefore, it is highly desirable to design a magnetic stirrer that is fully suspended and non-contact in operation.
Disclosure of Invention
The invention aims to provide a magnetic stirrer using a magnetic suspension technology, which solves the problems in the prior art, solves the problem of abrasion and pollution caused by using a traditional mechanical bearing, prolongs the service life of the magnetic stirrer and improves the quality of liquid medicine.
In order to achieve the purpose, the invention provides the following scheme: the present invention provides a magnetic stirrer using a magnetic levitation technique, comprising:
a drive shaft; the driving shaft is driven by a motor;
a stirring shaft; one end of the stirring shaft is in non-contact transmission with the driving shaft; the other end of the stirring shaft is provided with a stirring impeller;
a balancing component; two groups of balance components are arranged and are respectively arranged at two ends of the stirring shaft;
a support assembly; the (mixing) shaft is installed in the supporting component, just the last location of supporting component is installed balanced subassembly.
The support assembly comprises a first end cover, a second end cover and a shell support; the first end cover and the second end cover are respectively installed at the two ends of the shell support through threads; the stirring shaft is arranged in the shell support.
The first end cover comprises a cover body and first axial supporting magnetic steel arranged on the end face of one side, far away from the shell support, of the cover body; the first axial supporting magnetic steel and the second axial supporting magnetic steel arranged on the stirring shaft repel each other in magnetism and do not contact with each other; the driving shaft and the second axial supporting magnetic steel are in non-contact transmission.
The stirring shaft also comprises a mandrel; one end of the mandrel extends out of the second end cover and is provided with the stirring impeller; the other end of the mandrel extends out of the cover body and is provided with inner magnetic steel; the second axial supporting magnetic steel is fixedly arranged on the opposite side of the inner magnetic steel and the cover body;
a sleeve is arranged on the side wall of the mandrel; the two ends of the mandrel are respectively provided with the balance assemblies through bearing rotors;
the mandrel is also provided with a magnetism isolating ring; the magnetism isolating ring is arranged between the bearing rotor and the inner magnetic steel.
The balance assembly is mounted in the housing support; the balance assembly comprises an electromagnetic bearing and a sensor; the electromagnetic bearings are abutted against the inner wall of the shell support, and the first end cover and the second end cover are respectively abutted against the two electromagnetic bearings; the sensor penetrates through the inner side wall and the outer side wall of the shell support and abuts against the partition plate.
The baffle is arranged in the sleeve outer wall, just the baffle both ends respectively fixed mounting in on first end cover and the second end cover.
The first axial supporting magnetic steel and the second axial supporting magnetic steel are formed by arranging permanent magnets which are magnetized in the axial direction through a Halbach array.
The driving shaft is arranged in the supporting sleeve; the support sleeve is in threaded connection with the first end cover.
The invention discloses the following technical effects: permanent magnets are arranged on the support assembly and the stirring shaft, so that repulsion force generated by the permanent magnets is counterbalanced with gravity and axial load, and axial suspension of the stirring shaft is realized;
two electromagnetic bearing rotors are arranged on the stirring shaft and interact with the two electromagnetic bearings to control four degrees of freedom of the stirring shaft, realize radial suspension of the stirring shaft and inhibit unbalanced response of the stirring shaft through an algorithm, so that the rotors rotate more stably and the rotating speed is higher;
through permanent magnetism suspension and electromagnetism suspension technique, realize the axial and the radial suspension of (mixing) shaft, through the indirect drive (mixing) shaft of drive shaft, have full suspension contactless, no mechanical wear, the interference killing feature is strong, easily control, advantages such as long service life.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of the overall structure;
FIG. 2 is a schematic sensor flow diagram;
FIG. 3 is a schematic diagram of a magnetic bearing-rotor system
FIG. 4 is a diagram of an LMS algorithm;
wherein, 1, a driving shaft; 2. a support sleeve; 3. a first end cap; 31. a cover body; 32. a first axial support magnetic steel; 4. a housing support; 5. a second end cap; 6. a stirring shaft; 61. internal magnetic steel; 62. a second axial support magnetic steel; 63. a magnetism isolating ring; 64. an electromagnetic bearing rotor; 65. a sleeve; 66. a mandrel; 7. an electromagnetic bearing; 71. an electromagnetic bearing stator; 72. an electromagnetic bearing coil; 8. a sensor; 9. a separator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
The present invention provides a magnetic stirrer using a magnetic levitation technique, comprising:
a drive shaft 1; the driving shaft 1 is driven by a motor;
a stirring shaft 6; one end of the stirring shaft 6 is in non-contact transmission with the driving shaft 1; the other end of the stirring shaft 6 is provided with a stirring impeller;
a balancing component; the balance components are provided with two groups and are respectively arranged at two ends of the stirring shaft 6;
a support assembly; the stirring shaft 6 is arranged in the supporting component, and the supporting component is provided with a balance component in a positioning way.
The support assembly comprises a first end cap 3, a second end cap 5 and a housing seat 4; a first end cover 3 and a second end cover 5 are respectively installed at two ends of the outer shell support 4 in a threaded manner; the stirring shaft 6 is arranged in the shell support 4.
The first end cover 3 comprises a cover body 31 and a first axial supporting magnetic steel 32 which is arranged on the end face of one side of the cover body 31 far away from the shell support 4; the first axial supporting magnetic steel 32 and the second axial supporting magnetic steel 62 arranged on the stirring shaft 6 are magnetically repelled and are not contacted with each other; the drive shaft 1 is in non-contact transmission with the second axial supporting magnetic steel 62.
The stirring shaft 6 further comprises a mandrel 66; one end of the mandrel 66 extends out of the second end cover 5 and is provided with a stirring impeller; the other end of the mandrel 66 extends out of the cover body 31 and is provided with internal magnetic steel 61; a second axial supporting magnetic steel 62 is fixedly arranged on the opposite side of the inner magnetic steel 61 and the cover body 31;
a sleeve 65 is arranged on the side wall of the mandrel 66; two ends of the mandrel 66 are respectively provided with a balance component through a bearing rotor 64;
the mandrel 66 is also provided with a magnetism isolating ring 63; the magnetism isolating ring 63 is arranged between the bearing rotor 64 and the inner magnetic steel 61.
The balance assembly is arranged in the shell support 4; the balance assembly comprises an electromagnetic bearing 7 and a sensor 8; the electromagnetic bearings 7 are abutted against the inner wall of the shell support 4, and the first end cover 3 and the second end cover 5 are respectively abutted against the two electromagnetic bearings 7; the sensor 8 penetrates through the inner and outer side walls of the housing holder 4 and abuts on the diaphragm 9.
The partition board 9 is arranged on the outer wall of the sleeve 65, and two ends of the partition board 9 are respectively fixedly arranged on the first end cover 3 and the second end cover 5.
The first axial support magnet 32 and the second axial support magnet 62 are formed by axially magnetized permanent magnets arranged in a Halbach array.
The driving shaft 1 is arranged in the supporting sleeve 2; the support sleeve 2 is screwed to the first end cap 3.
In one embodiment of the present invention, the driving shaft 1 is in non-contact with the internal magnetic steel 61 and magnetically coupled by magnetic field force to drive the stirring shaft 6 to rotate, thereby driving the rotating impeller to rotate.
In one embodiment of the present invention, the first axial supporting magnetic steel 32 and the second axial supporting magnetic steel 62 repel each other, so as to realize axial suspension of the stirring shaft 6, and the stirring shaft 6 is controlled by two electromagnetic bearings 7, so as to realize radial suspension of the stirring shaft 6.
In one embodiment of the present invention, the two ends of the partition 9 are respectively connected to the first end cap 3 and the second end cap 4, so as to wrap the two electromagnetic bearings 7, prevent the corrosion damage of the liquid medicine to the electromagnetic bearings 7, and protect the liquid medicine from being contaminated.
In one embodiment of the present invention, the first end cap 3 and the second end cap 4 are respectively abutted against the electromagnetic bearings 7 installed at two ends of the housing support 4, so as to realize the limit fixing of the electromagnetic bearings 7.
In one embodiment of the invention, the electromagnetic bearing 7 is composed of an electromagnetic bearing stator and an electromagnetic bearing coil 72.
In an embodiment of the present invention, the sensor 8 may obtain a radial displacement signal of the stirring shaft 6, and the radial displacement signal is converted into a current through the controller and the power amplifier, and the current is applied to the electromagnetic bearing stator 71, so that the stirring shaft 6 is suspended stably in the radial direction.
Further, unbalanced vibration of the stirring shaft 6 is mainly concentrated in the radial direction, and is caused by unbalanced force of the stirring shaft 6, the unbalanced vibration can be equivalent to the position of the electromagnetic bearing 7 by utilizing an equivalent principle, and the unbalanced force of the stirring shaft 6 can be inhibited by inhibiting the equivalent unbalanced force at the electromagnetic bearing 7.
In one embodiment of the invention, the key to unbalanced vibration suppression is the compensation voltage U c And (t) solving the phase and amplitude.
Wherein the compensation voltage U c (t) is represented by the formula (1). In the formula
In order to compensate the amplitude and phase of the voltage signal, alpha and beta are the coefficients of the Fourier expansion form thereof, and alpha cos ω t-beta sin ω t and alpha sin ω t + beta cos ω t are compensation control signals added in the x and y directions respectively.
In one embodiment of the present invention, the amplitude of the compensation signal is solved by compensating the control signal and then using the influence coefficient method, as shown in fig. 3. Plane P of two sensors s1 And P s2 For the unbalance detection surface, the plane P in which the two electromagnetic bearings are located b1 And P b2 An unbalance correction surface; at the correction plane P b1 Applying a control voltage signal
Then, the vibration displacement vector of each detection surface is obtained as
And
can find the position of the correction plane P b1 Applying a control voltage signal
At first, two unbalanced detection planes P are detected s1 And P s2 The influence coefficient of the upper displacement is as formula (2);
at the correction plane P b2 Applying a control voltage signal
Then, the influence coefficient is as formula (3);
assumed to be in the correction plane P b1 And P b2 On the respective trial-and-error control voltage signal
And with
While detecting the plane P s1 And P s2 If the displacement is zero, the imbalance vector equation is as shown in the formula (4);
easy to obtain correction surface P b1 And P b2 The form of the compensation voltage signal is as shown in formula (5);
the imbalance suppression algorithm utilizes the LMS algorithm to achieve phase tracking. The rotor displacement signal is a sine signal, and the form of the sine signal is as shown in a formula (6);
where A is the amplitude function of the rotor displacement signal with respect to time, ω 0 Is the angular frequency of rotation of the rotor,
is the phase shift angle.
Order to
And discretizing, then having formula (7)
d(kT)＝w 1 (kT)cos(ω 0 kT)+w 2 (kT)sin(ω 0 kT) (7)
Defining the algorithm input vector as X (kT) = [ sin (omega) = 0 kT)cos(ω 0 kT)] T ，
The weight vector of the algorithm is W (kT) = [ W = 1 (kT)w 2 (kT)] T The desired signal is d (kT), i.e. the displacement signal of the rotor, y (kT) the algorithm following signal, e (kT) the algorithm error signal, ω 0 Is the filtered angular frequency.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. A magnetic stirrer using magnetic levitation technology, comprising:
a drive shaft (1); the driving shaft (1) is driven by a motor;
a stirring shaft (6); one end of the stirring shaft (6) is in non-contact transmission with the driving shaft (1); the other end of the stirring shaft (6) is provided with a stirring impeller;
a balancing component; the two groups of balance components are arranged and are respectively arranged at two ends of the stirring shaft (6);
a support assembly; the stirring shaft (6) is installed in the supporting component, and the balancing component is installed on the supporting component in a positioned mode.
2. A magnetic stirrer using magnetic levitation technology as recited in claim 1, wherein: the support assembly comprises a first end cap (3), a second end cap (5) and a housing seat (4); the first end cover (3) and the second end cover (5) are respectively installed at two ends of the shell support (4) in a threaded mode; the stirring shaft (6) is arranged in the shell support (4).
3. A magnetic stirrer using magnetic levitation technology as recited in claim 2, wherein: the first end cover (3) comprises a cover body (31) and first axial supporting magnetic steel (32) which is arranged on the end face of one side, far away from the shell support (4), of the cover body (31); the first axial supporting magnetic steel (32) and a second axial supporting magnetic steel (62) arranged on the stirring shaft (6) are in magnetic repulsion and are not in contact with each other; the driving shaft (1) and the second axial supporting magnetic steel (62) are in non-contact transmission.
4. A magnetic stirrer using magnetic levitation technology as recited in claim 3, wherein: the stirring shaft (6) further comprises a mandrel (66); one end of the mandrel (66) extends out of the second end cover (5) and is provided with the stirring impeller; the other end of the mandrel (66) extends out of the cover body (31) and is provided with internal magnetic steel (61); the second axial supporting magnetic steel (62) is fixedly arranged on the opposite side of the inner magnetic steel (61) and the cover body (31);
a sleeve (65) is arranged on the side wall of the mandrel (66); and the two ends of the mandrel (66) are respectively provided with the balance assembly through a bearing rotor (64).
5. A magnetic stirrer using magnetic levitation technology as claimed in claim 4, wherein: the mandrel (66) is also provided with a magnetism isolating ring (63); the magnetism isolating ring (63) is arranged between the bearing rotor (64) and the inner magnetic steel (61).
6. A magnetic stirrer using magnetic levitation technology as claimed in claim 4, wherein: the balancing assembly is mounted in the housing support (4); the balance assembly comprises an electromagnetic bearing (7) and a sensor (8); the electromagnetic bearings (7) are abutted against the inner wall of the shell support (4), and the first end cover (3) and the second end cover (5) are respectively abutted against the two electromagnetic bearings (7); the sensor (8) penetrates through the inner side wall and the outer side wall of the shell support (4) and is abutted against the partition plate (9).
7. A magnetic stirrer using magnetic levitation technology as claimed in claim 6, wherein: the partition plate (9) is arranged on the outer wall of the sleeve (65), and two ends of the partition plate (9) are fixedly mounted on the first end cover (3) and the second end cover (5) respectively.
8. A magnetic stirrer using magnetic levitation technology as recited in claim 3, wherein: the first axial supporting magnetic steel (32) and the second axial supporting magnetic steel (62) are formed by arranging permanent magnets which are magnetized in the axial direction through a Halbach array.
9. A magnetic stirrer using magnetic levitation technology as recited in claim 2, wherein: the driving shaft (1) is arranged in the supporting sleeve (2); the supporting sleeve (2) is in threaded connection with the first end cover (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211183314.0A CN115501794A (en) | 2022-09-27 | 2022-09-27 | Magnetic stirrer using magnetic suspension technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211183314.0A CN115501794A (en) | 2022-09-27 | 2022-09-27 | Magnetic stirrer using magnetic suspension technology |
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| CN202211183314.0A Pending CN115501794A (en) | 2022-09-27 | 2022-09-27 | Magnetic stirrer using magnetic suspension technology |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1188474A1 (en) * | 2000-09-13 | 2002-03-20 | Levitronix LLC | Magnetic stirrer |
| JP2002191955A (en) * | 2000-12-27 | 2002-07-10 | Hanwa Kakoki Kk | Stirring device |
| CN201862378U (en) * | 2010-11-11 | 2011-06-15 | 西南交通大学 | High-temperature superconducting magnetic suspension sterile stirrer |
| CN202424591U (en) * | 2011-12-29 | 2012-09-05 | 成都英德生物工程有限公司 | Automatic magnetic levitation stirring mechanism |
| CN104895922A (en) * | 2015-05-28 | 2015-09-09 | 山东大学 | Single-ended axial separation type magnetic suspension bearing applied to centrifugal artificial heart pump |
| CN105080410A (en) * | 2014-05-21 | 2015-11-25 | 白万本 | Low heat source magnetic stirring device |
| WO2021114491A1 (en) * | 2019-12-13 | 2021-06-17 | 南京磁谷科技股份有限公司 | Mounting structure of magnetic bearings of magnetic suspension centrifuge |
| CN214274250U (en) * | 2020-12-31 | 2021-09-24 | 楚天科技股份有限公司 | Axle suspension braced system |
| KR20210132452A (en) * | 2020-04-27 | 2021-11-04 | 김혁배 | Magnetic Mixer And Mixing System Including The Same |
| CN115001336A (en) * | 2022-06-14 | 2022-09-02 | 武汉理工大学 | Vibration control method for rotor of full-speed magnetic suspension high-speed motor |
| CN115041068A (en) * | 2022-06-14 | 2022-09-13 | 武汉理工大学 | Magnetic stirrer supported by both fluid dynamic pressure bearing and permanent magnet bearing |
-
2022
- 2022-09-27 CN CN202211183314.0A patent/CN115501794A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1188474A1 (en) * | 2000-09-13 | 2002-03-20 | Levitronix LLC | Magnetic stirrer |
| JP2002191955A (en) * | 2000-12-27 | 2002-07-10 | Hanwa Kakoki Kk | Stirring device |
| CN201862378U (en) * | 2010-11-11 | 2011-06-15 | 西南交通大学 | High-temperature superconducting magnetic suspension sterile stirrer |
| CN202424591U (en) * | 2011-12-29 | 2012-09-05 | 成都英德生物工程有限公司 | Automatic magnetic levitation stirring mechanism |
| CN105080410A (en) * | 2014-05-21 | 2015-11-25 | 白万本 | Low heat source magnetic stirring device |
| CN104895922A (en) * | 2015-05-28 | 2015-09-09 | 山东大学 | Single-ended axial separation type magnetic suspension bearing applied to centrifugal artificial heart pump |
| WO2021114491A1 (en) * | 2019-12-13 | 2021-06-17 | 南京磁谷科技股份有限公司 | Mounting structure of magnetic bearings of magnetic suspension centrifuge |
| KR20210132452A (en) * | 2020-04-27 | 2021-11-04 | 김혁배 | Magnetic Mixer And Mixing System Including The Same |
| CN214274250U (en) * | 2020-12-31 | 2021-09-24 | 楚天科技股份有限公司 | Axle suspension braced system |
| CN115001336A (en) * | 2022-06-14 | 2022-09-02 | 武汉理工大学 | Vibration control method for rotor of full-speed magnetic suspension high-speed motor |
| CN115041068A (en) * | 2022-06-14 | 2022-09-13 | 武汉理工大学 | Magnetic stirrer supported by both fluid dynamic pressure bearing and permanent magnet bearing |
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