Magnetic suspension stirrer and stirring container

Abstract

The invention discloses a magnetic suspension stirrer and a stirring container, and relates to the technical field of magnetic suspension motors. The magnetic suspension stirrer comprises a stand column, stator assemblies and an outer rotor assembly, each stator assembly comprises a first magnetic drive winding and a second magnetic drive winding which are arranged on the stand column, the number of the stator assemblies is at least two, and the stator assemblies are distributed in the axial direction of the stand column; the outer rotor assembly sleeves the periphery of the stand column and comprises a first permanent magnet and a second permanent magnet; the first magnetic drive winding and the first permanent magnet correspondingly form a first magnetic control module, and the first magnetic control module is used for applying torque and suspension force to the outer rotor assembly; and the second magnetic drive winding and the second permanent magnet correspondingly form a second magnetic control module, and the second magnetic control module is used for applying axial driving force to the outer rotor assembly so as to drive the outer rotor assembly to move between positions corresponding to different stator assemblies. According to the scheme, at least the mixing uniformity of the stirred object can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic levitation motors, and in particular to a magnetic levitation agitator and a stirring container. Background Art

[0002] In the fields of medicine, biochemistry, etc., stirring devices are often needed, for example, to stir and mix liquid medicines, suspend cells and culture them. The use of traditional stirring devices will bring some negative problems, such as the abrasives generated by the friction of mechanical bearings contacting the materials will enter the stirred material, affecting the purity of the product; friction generates heat, affecting the low-temperature preparation environment; and the oil and other materials brought in by maintenance will contaminate the stirred material. Therefore, in fields such as medicine and biochemistry that have strict requirements on the reaction environment, magnetic levitation stirrers are usually used to implement stirring operations to deal with the aforementioned problems of traditional stirrers.

[0003] In the related art, the magnetic levitation stirrer includes a column, a stator and a rotor impeller, wherein the stator is arranged on the column, the rotor impeller is mounted on the column corresponding to the stator, and the magnetic field generated by the stator is used to achieve the suspension and rotation of the rotor impeller. Since the rotor impeller and the stator are not in contact, high-speed rotation is achieved, so the mixing uniformity of the stirred objects can be improved. However, in practice, the improvement of the mixing uniformity of the stirred objects by the related magnetic levitation stirrer is still very limited. Summary of the invention

[0004] The present application provides a magnetic levitation stirrer and a stirring container, which can at least effectively improve the mixing uniformity of the stirred objects.

[0005] In a first aspect, an embodiment of the present application provides a magnetic levitation agitator, comprising a column, a stator assembly and an outer rotor assembly.

[0006] Among them: the stator assembly includes a first magnetic drive winding and a second magnetic drive winding arranged on the column, there are at least two stator assemblies, and each stator assembly is distributed along the axial direction of the column; the outer rotor assembly is sleeved on the outer periphery of the column, and the outer rotor assembly includes a first permanent magnet and a second permanent magnet; the first magnetic drive winding and the first permanent magnet correspondingly constitute a first magnetic control module, and the first magnetic control module is used to apply torque and suspension force to the outer rotor assembly; the second magnetic drive winding and the second permanent magnet correspondingly constitute a second magnetic control module, and the second magnetic control module is used to apply axial driving force to the outer rotor assembly to drive the outer rotor assembly to move between positions corresponding to different stator assemblies.

[0007] In some embodiments, there are multiple first magnetic drive windings, which are evenly arranged along the circumference of the column, and there are multiple second magnetic drive windings, which are evenly arranged along the circumference of the column; in the circumference of the column, the first magnetic drive windings and the second magnetic drive windings are staggered.

[0008] In some embodiments, in the same stator assembly, along the axial direction of the column, the center distance between the second magnetic drive winding and the first magnetic drive winding is a first distance; in the same outer rotor assembly, along its axial direction, the center distance between the second permanent magnet and the first permanent magnet is a second distance; the first distance is not equal to the second distance.

[0009] In some embodiments, the second permanent magnet is a magnetic ring, which is disposed axially around the outer rotor assembly.

[0010] In some embodiments, the second permanent magnet includes a plurality of permanent magnet units, and the plurality of permanent magnet units are evenly distributed along the circumference of the outer rotor assembly.

[0011] In some embodiments, the magnetic levitation agitator also includes a detection element arranged corresponding to the stator assembly, and the detection element is used to detect the axial position of the outer rotor assembly; wherein: there are multiple first magnetic drive windings, and they are evenly arranged along the circumference of the column, and the detection element is arranged in the area between adjacent first magnetic drive windings; and / or, along the axial direction of the column, the detection element is arranged corresponding to the corresponding first magnetic drive winding.

[0012] In some embodiments, in the same stator assembly, the first magnetic drive winding and the second magnetic drive winding are arranged axially or radially along the column; in the same outer rotor assembly, the first permanent magnet and the second permanent magnet are arranged axially or radially along the outer rotor assembly.

[0013] In some embodiments, the column is divided into a first column and a second column, the outer rotor assembly includes an impeller, the impeller is divided into a first wheel body and a second wheel body, the first wheel body is mounted on the outer periphery of the first column, the first column has an axially extending receiving cavity, the second column is arranged in the receiving cavity, the second wheel body is mounted on the outer periphery of the second column, and in the axial direction of the second column, the projection of the second wheel body is located in the gap between the first column and the second column; wherein: the length of the first column is less than the length of the second column, the second wheel body can move along the second column to the part of the second column extending out of the first column; and / or, the first column has a connecting port, the connecting port connects the gap with the outside of the first column.

[0014] In some embodiments, when the first cylinder has a communication port, the magnetic levitation agitator includes at least one set of stator components correspondingly arranged at the same axial position of the first cylinder and the second cylinder.

[0015] In some embodiments, in the same stator assembly, along the axial direction of the column, the second magnetic drive winding is arranged on both sides of the first magnetic drive winding, and the second magnetic drive winding on both sides of the first magnetic drive winding is symmetrically distributed relative to the first magnetic drive winding; in the same outer rotor assembly, along the axial direction of the impeller, the second permanent magnet is arranged on both sides of the first permanent magnet, and the second permanent magnet on both sides of the first permanent magnet is symmetrically distributed relative to the first permanent magnet.

[0016] In a second aspect, an embodiment of the present application provides a stirring container, which includes the magnetic levitation stirrer as described in the first aspect of the present application.

[0017] The technical solution adopted in the embodiments of the present application can achieve the following beneficial effects: In the magnetic levitation agitator disclosed in the embodiment of the present application, a second magnetic drive winding is added to the stator assembly and a second permanent magnet is added to the outer rotor assembly. A second magnetic control module for applying axial driving force to the outer rotor assembly is constructed by the second magnetic drive winding and the second permanent magnet, thereby driving the outer rotor assembly to move along the column between positions corresponding to different stator assemblies.

[0018] Compared with the related art, the outer rotor assembly in the embodiment of the present application can move at different axial positions of the column and suspend at different height positions on the column. According to the needs of the stirred object, the position of the impeller can be adaptively adjusted, and it has the ability to perform stirring operations at any specific height position in the stirred object, thereby meeting its stirring needs and making the stirred object evenly mixed. It can be seen that the magnetic levitation stirrer disclosed in the embodiment of the present application can effectively adapt to stirred objects with different stirring needs, has excellent applicability, and can greatly improve the mixing uniformity of the stirred object. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0020] In the attached picture: Figure 1 This is a schematic structural diagram of a stirring container disclosed in the first embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the stirring container disclosed in the first embodiment of the present application when a portion of the container shell is hidden; Figure 3 A schematic diagram of the structure of a stator assembly disclosed in some embodiments of the present application; Figure 4 It is a schematic diagram of the structure of the outer rotor assembly disclosed in some embodiments of the present application; Figure 5 This is a schematic structural diagram of a magnetic levitation stirrer disclosed in the first embodiment of the present application; Figure 6 About Figure 5 AA cross-sectional view; Figure 7 for Figure 6 A partial enlarged view of point C in the middle; Figure 8 About Figure 5 A cross-sectional view along the BB direction; Fig. 9 A partial cross-sectional view of the magnetic levitation stirrer disclosed in the first embodiment of the present application; Figure 10~Figure 15 A schematic diagram of controlling the movement of an outer rotor assembly of a magnetic levitation agitator disclosed in some embodiments of the present application; Fig.16 This is a schematic structural diagram of the magnetic levitation agitator disclosed in the second embodiment of the present application.

[0021] Description of reference numerals: 100-column, 100a-first column, 100a1-receiving cavity, 100b-second column, 110-shell unit, 200-stator assembly, 210-first magnetic drive winding, 220-second magnetic drive winding, 230-first magnetic isolation member, 300-outer rotor assembly, 310-impeller, 310a-first wheel body, 310b-second wheel body, 311-impeller body, 312-first cover body, 320-first permanent magnet, 330-second permanent magnet, 340-second magnetic isolation member, 400-Detection element, 500-Wire harness, 600 - container shell, 610 - second cover, 620 - stirring chamber. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0023] In order to facilitate understanding of the magnetic levitation agitator and stirring container provided in the embodiments of the present application, the relevant technologies are first introduced in conjunction with application scenarios.

[0024] In the related technologies using magnetic levitation stirrers for stirring, it is often found that the mixing uniformity of the stirred objects (drug solutions, cell culture media, etc.) cannot meet expectations. That is to say, even if a magnetic levitation stirrer is used, the mixing uniformity of the stirred objects cannot be effectively improved.

[0025] After research, the inventors found that the above problems are mainly caused by the poor applicability of the magnetic levitation agitator. Specifically, the impeller distribution of the same magnetic levitation agitator is fixed, so the corresponding impeller can only stir the stirred material at the same height. However, in some scenarios with high-standard stirring requirements, some stirred materials need to be stirred at a specific height, such as the boundary position of different liquid layers or within the corresponding liquid layer. In addition, the material ratio needs to be adjusted, and the liquid layer distribution and other conditions will also change accordingly, which will make the corresponding stirring requirements more complicated. Since the impeller in the related technology cannot perform stirring operations at a controllable height, the materials of the stirred materials cannot be fully mixed, resulting in poor mixing uniformity. For such high-standard stirring requirements, special agitators can also be customized, but the cost will increase significantly.

[0026] In view of this, some embodiments of the present application provide a magnetic levitation agitator.

[0027] See also Figure 1 to Figure 16 The magnetic levitation agitator disclosed in the embodiment of the present application includes a column 100, a stator assembly 200 and an outer rotor assembly 300.

[0028] Among them, the column 100 is the basic component of the magnetic levitation stirrer, which serves as the installation base of the stator assembly 200. The column 100 has an installation space inside, and the stator assembly 200 is arranged in the installation space, so that the stator assembly 200 can be protected by the column 100, and it can also be isolated from the external stirred object to avoid damage caused by corrosion and other reasons. Specifically, the stator assembly 200 includes a first magnetic drive winding 210 and a second magnetic drive winding 220, and the first magnetic drive winding 210 and the second magnetic drive winding 220 are both arranged in the column 100.

[0029] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the column 100 includes a plurality of shell units 110 distributed along its axial direction, and each shell unit 110 is correspondingly installed with a stator assembly 200. Adjacent shell units 110 can be separated from each other, so that it is convenient to install the stator assembly 200 into the shell unit 110 and then assemble the shell unit 110; in this case, when a stator assembly 200 is damaged, it is also convenient to check or disassemble and replace it. Of course, the column 100 can also be an integrally formed structure. In this case, the stator assembly 200 can be installed into the column 100 in sequence, and each stator assembly 200 can be positioned and assembled in the axial direction of the column 100 by means such as snap-on.

[0030] Regarding the stator assembly 200, the first magnetic drive winding 210 and the second magnetic drive winding 220 therein each include an iron core and a coil wound on the iron core, which together constitute an electromagnet to form an electromagnetic field when the coil is energized. Figure 6 and Figure 7 As shown, a wire harness 500 is arranged in the column 100 along its axial direction, and the wire harness 500 is connected to the coil in the corresponding stator assembly 200 to supply power and realize signal interaction.

[0031] In some embodiments, the first magnetic drive winding 210 and the second magnetic drive winding 220 may be separated by a first magnetic isolation member 230 to prevent the magnetic fields generated by the two from affecting each other, thereby improving the magnetic drive effects of each. The first magnetic isolation member 230 may be a magnetic isolation ring.

[0032] The outer rotor assembly 300 includes an impeller 310, a first permanent magnet 320 and a second permanent magnet 330, and the first permanent magnet 320 and the second permanent magnet 330 are both arranged in the impeller 310. The impeller 310 is a basic component of the outer rotor assembly 300, which can provide a mounting base for the first permanent magnet 320 and the second permanent magnet 330. Exemplarily, the first permanent magnet 320 and the second permanent magnet 330 can also be arranged inside the impeller 310, so that the former is protected by the impeller 310 to avoid damage, such as contamination and corrosion by the stirred object. In order to facilitate the installation of the first permanent magnet 320 and the second permanent magnet 330 inside the impeller 310, the impeller 310 can be configured to include an impeller body 311 and a first cover body 312, and the first cover body 312 is detachably connected to the impeller body 311.

[0033] In some embodiments, the first permanent magnet 320 and the second permanent magnet 330 may be separated by a second magnetic isolation member 340 to prevent the magnetic fields generated by the two from affecting each other. The second magnetic isolation member 340 may be a magnetic isolation ring.

[0034] In some embodiments, Figure 2 As shown, there can be multiple outer rotor assemblies 300, and the rotation speed of each outer rotor assembly 300 can be independently controlled, that is, each outer rotor assembly 300 can perform stirring operations at the same rotation speed or at different rotation speeds, thereby forming a variety of stirring schemes to adapt to stirred objects with different stirring requirements. Based on this, at least the following technical objectives can be achieved: maximally protecting low shear force solutions from damage, improving the mixing uniformity of high viscosity solutions, etc.

[0035] The impeller 310 is mounted on the outer periphery of the column 100; the first magnetic drive winding 210 and the first permanent magnet 320 may constitute a first magnetic control module, which is used to apply torque and suspension force to the outer rotor assembly 300. It can be understood that since the impeller 310 is mounted on the outer periphery of the column 100, the first permanent magnet 320 on the impeller 310 may correspond to the first magnetic drive winding 210 of the stator assembly 200 at the corresponding position. The magnetic fields generated by the first magnetic drive winding 210 and the first permanent magnet 320 can interact with each other, and can generate suspension force and electromagnetic torque on the first permanent magnet 320, the impeller 310 and even the entire outer rotor assembly 300, so as to drive the outer rotor assembly to rotate around the corresponding stator assembly 200. By adjusting the magnitude and direction of the current in the first magnetic drive winding 210, the speed and direction of the outer rotor assembly 300 can be controlled respectively.

[0036] At the same time, there are at least two stator assemblies 200, and each stator assembly 200 is distributed along the axial direction of the column 100; the second magnetic drive winding 220 and the second permanent magnet 330 correspond to form a second magnetic control module, and the second magnetic control module is used to apply an axial driving force to the outer rotor assembly 300 to drive the outer rotor assembly 300 to move between positions corresponding to different stator assemblies 200. It can be understood that the second permanent magnet 330 on the outer rotor assembly 300 can correspond to the second magnetic drive winding 220 of the corresponding stator assembly 200, and the magnetic fields generated by the second magnetic drive winding 220 and the second permanent magnet 330 can interact with each other, and can generate an axial driving force on the second permanent magnet 330, the impeller 310 and even the entire outer rotor assembly 300, so as to drive the outer rotor assembly 300 to move axially along the column 100.

[0037] It should be noted that, in the related art, the control of the axial degree of freedom of the outer rotor assembly 300 by the stator assembly 200 usually belongs to passive suspension control, which can maintain the posture balance relationship between the outer rotor assembly 300 and a corresponding stator assembly in the axial direction. Different from the related art, in the embodiment of the present application, since the stator assembly 200 includes a second magnetic drive winding 220 and forms a second magnetic control module with the second permanent magnet 330 of the outer rotor assembly 300, the control of the axial degree of freedom of the outer rotor assembly 300 by the magnetic suspension agitator includes active control.

[0038] In the control method of the magnetic levitation stirrer based on the embodiment of the present application, first, the stirring strategy can be determined according to the situation of the stirred object. Since the proportions of each material are different, the proportions of each material liquid layer in the stirring container are also different. After placing each material in the stirring container, the stirring strategy can be determined according to the actual situation after the stirred object is mixed. The stirring strategy may include at least one of the following: performing stirring operation at the boundary position of the liquid layer of the stirred object; performing stirring operation at a preset position in the target liquid layer; performing stirring operation at a preset rotation speed for the target material.

[0039] Then, according to the stirring strategy, the outer rotor assembly 300 is driven by the axial displacement control device to adjust to the target stirring position along the axial direction of the column 100. Subsequently, the outer rotor assembly 300 is controlled to rotate to implement the stirring operation.

[0040] Specifically, please refer to Figure 10~Figure 15 In the process of the outer rotor assembly 300 moving along the column 100, when the outer rotor assembly 300 is in the initial stirring position, an axial driving force is applied to the outer rotor assembly 300 through the second magnetic control module, and the suspension force on the outer rotor assembly 300 can be weakened by reducing the current. The axial driving force overcomes the influence of the suspension force, and the outer rotor assembly 300 is reliably and stably separated from the control of the stator assembly 200 at the initial stirring position and moved to the target position, and the suspension force is applied by the stator assembly 200 at this position. At this point, a complete process of the outer rotor assembly 300 moving on the column 100 is realized.

[0041] in, Figure 10~Figure 15 The embodiment shown only represents a control method for the outer rotor assembly 300 to move on the column 100, and is not a specific limitation on the control method of the embodiment of the present application. Figure 10~Figure 15 The second magnetic drive winding 220 which is not powered can also be powered to generate a magnetic field to apply force to the outer rotor assembly 300.

[0042] According to the magnetic resistance characteristics, when the outer rotor assembly 300 is close to the stator assembly 200 at the target position, the suspension control effect of the stator assembly 200 on the axial freedom of the outer rotor assembly 300 will generate a magnetic pulling force to pull the outer rotor assembly 300 to a balanced position.

[0043] Of course, in the embodiment of the present application, the specific control details of the axial movement of the outer rotor assembly 300 along the column 100 are not limited. For example, in the control process of the outer rotor assembly 300 separating from the stator assembly 200 from the initial stirring position, the current in the stator assembly 200 at the initial stirring position may not be reduced, and the stator assembly 200 may still provide a large suspension force to maintain a relatively stable suspension state. In this case, the axial driving force applied to the outer rotor assembly 300 by the second magnetic control module can be increased. In addition, the axial driving force applied to the outer rotor assembly 300 by the second magnetic control modules can be applied by different second magnetic control modules. Specifically, it can be the second magnetic control module formed by the stator assembly 200 at the initial stirring position and the outer rotor assembly 300, or it can be the second magnetic control module formed by the stator assembly 200 at the target position and the outer rotor assembly 300. Of course, the above two second magnetic control modules can also apply axial driving force at the same time, and the two can apply thrust and pulling force respectively.

[0044] Based on the above structural layout characteristics, the outer rotor assembly 300 can move axially along the column 100 through the axial driving force applied by the second magnetic control module, and suspend at different height positions on the column 100. According to the needs of the stirred object, the position of the impeller 310 and the outer rotor assembly 300 can be adaptively adjusted, and it has the ability to perform stirring operations at any specific height position in the stirred object, thereby being able to meet its stirring needs and make the stirred object evenly mixed. It can be seen that the magnetic levitation agitator disclosed in the embodiment of the present application can effectively adapt to stirred objects with different stirring needs, has excellent applicability, can meet the horizontal and vertical stirring needs of different liquid layer material components, and can greatly improve the mixing uniformity of the stirred object.

[0045] The lateral stirring requirement can be met by implementing the stirring operation in the corresponding area through the outer rotor assembly 300, and the longitudinal stirring requirement can be met by adjusting the longitudinal position of the outer rotor assembly 300 by moving axially along the column 100 to adjust the stirring effect on the longitudinal path.

[0046] In addition, the outer rotor assembly 300 performs stirring operations at different positions, and its rotation speed can be controlled to adapt to the stirring requirements of the material components at the corresponding positions, so as to achieve effects such as preventing excessive shear force from damaging the stirred components by controlling the rotation speed.

[0047] In some embodiments, Figure 3 As shown, there are multiple first magnetic drive windings 210, and they are evenly arranged along the circumference of the column 100. There are multiple second magnetic drive windings 220, and they are evenly arranged along the circumference of the column 100. In the circumference of the column 100, the first magnetic drive windings 210 and the second magnetic drive windings 220 are staggered.

[0048] It can be understood that no matter it is the first magnetic drive winding 210 or the second magnetic drive winding 220, at the circumferential position of each corresponding column 100, its magnetic flux is larger, that is, the density of magnetic flux lines is larger. Under the structural layout of this example, the passage areas of the corresponding magnetic flux lines of the first magnetic drive winding 210 and the second magnetic drive winding 220 are at least mostly staggered, which can greatly reduce the interference between the magnetic fields generated by the first magnetic drive winding 210 and the second magnetic drive winding 220, which is beneficial for the stator assembly 200 to provide a reliable magnetic drive force, specifically, to provide a suspension force and torque provided by the first magnetic control module, and an axial driving force provided by the second magnetic control module, so as to reliably implement the suspension and rotation control of the outer rotor assembly 300, so as to effectively implement the stirring operation, and reliably implement the axial drive control of the outer rotor assembly 300, so as to smoothly adjust the axial position of the outer rotor assembly 300 on the column 100.

[0049] In some embodiments, Figure 5~Figure 7 As shown, in the same stator assembly 200, along the axial direction of the column 100, the center distance between the second magnetic drive winding 220 and the first magnetic drive winding 210 is the first distance a; in the same outer rotor assembly 300, along its axial direction, the center distance between the second permanent magnet 330 and the first permanent magnet 320 is the second distance b; the first distance a is not equal to the second distance b.

[0050] It can be understood that, in the state where the outer rotor assembly 300 and the corresponding stator assembly 200 achieve stable suspension and rotation through the first magnetic control module, along the axial direction of the column 100, the first permanent magnet 320 and the first magnetic drive winding 210 correspond to each other, that is, the first permanent magnet 320 and the first magnetic drive winding 210 are approximately at the same height position, so that a temporarily determined height position relationship is formed between the outer rotor assembly 300 and the stator assembly 200. Combined with the structural layout of this example, when the outer rotor assembly 300 is in the initial stirring position, since the first distance a is not equal to the second distance b, the second permanent magnet 330 and the second magnetic drive winding 220 are staggered in the axial direction of the column 100, which is conducive to the interaction of the magnetic fields of the second magnetic drive winding 220 and the second permanent magnet 330 to generate an axial driving force, and is conducive to the smooth realization of the axial control of the outer rotor assembly 300. It is worth noting that when the outer rotor assembly 300 is in a state of stable suspension and rotation, if the second permanent magnet 330 and the second magnetic drive winding 220 are approximately at the same height position, the axial driving forces on the upper and lower sides of the second permanent magnet 330 will offset each other, which is not conducive to achieving axial control of the outer rotor assembly 300.

[0051] Of course, in some embodiments of the present application, when the outer rotor assembly 300 is in a state of stable suspension and rotation, the second permanent magnet 330 and the second magnetic drive winding 220 can also be configured at the same height position. In this case, the second magnetic control module constructed by the second magnetic drive winding 220 of the adjacent stator assembly 200 and the second permanent magnet 330 of the outer rotor assembly 300 can provide axial driving force, and the axial control of the outer rotor assembly 300 can also be achieved.

[0052] In the embodiments of the present application, the specific type of the second permanent magnet 330 is not limited.

[0053] Exemplarily, the second permanent magnet 330 may include a plurality of permanent magnet units, and the plurality of permanent magnet units are evenly distributed along the circumference of the outer rotor assembly 300. It can be understood that in this example, the second permanent magnet 330 is formed by distributing a plurality of permanent magnet units along the axial direction, and each permanent magnet unit can be separately assembled and disassembled. In this way, if the installation of the second permanent magnet 330 does not meet the requirements, the permanent magnet units can be separately debugged to meet the preset requirements, and the entire second permanent magnet 330 can be avoided from being adjusted.

[0054] In another specific embodiment, Figure 3 As shown, the second permanent magnet 330 is a magnetic ring, which is arranged around the axial direction of the outer rotor assembly 300. It can be understood that the magnetic flux lines of the magnetic ring are evenly distributed along its circumference, so that in the area corresponding to the magnetic field generated by the second magnetic drive winding 220, the magnetic fields of each part corresponding to the magnetic ring are also relatively more uniform, so that the axial driving force generated by the corresponding area of ​​each magnetic field is applied in a roughly uniform arrangement in the circumferential direction, and the axial driving forces at different parts in the circumferential direction are roughly equal, thereby generating a resultant force roughly distributed along the axial direction of the column 100, and basically not deflected, so that the outer rotor assembly 300 can smoothly achieve the movement action.

[0055] In an embodiment of the present application, the magnetic levitation agitator may include a detection element 400 provided in correspondence with the stator assembly 200, and the detection element 400 is used to detect the axial position of the outer rotor assembly 300, and the controller may obtain the axial position data of the outer rotor assembly 300 through it to adjust the axial driving force and / or the suspension force. Among them, the embodiment of the present application does not limit the specific type of the detection element 400. Exemplarily, the detection element 400 may be a Hall sensor or an eddy current sensor. Accordingly, the outer rotor assembly 300 includes a sensing element corresponding to the detection element 400. Specifically, when the detection element 400 is a Hall sensor, the sensing element is a permanent magnetic structure corresponding to the Hall sensor. Exemplarily, the sensing element may be the first permanent magnet 320; when the detection element 400 is an eddy current sensor, the sensing element may be a metal conductor corresponding to the eddy current sensor.

[0056] Furthermore, if Figure 3 , Figure 5 and Figure 8 As shown, there are multiple first magnetic drive windings 210, which are evenly arranged along the circumference of the column 100, and the detection element 400 is arranged in the area between adjacent first magnetic drive windings 210. It can be understood that the first magnetic drive windings 210 distributed along the circumference of the column 100 are spaced apart from each other, and the detection element 400 is arranged through the gap between adjacent first magnetic drive windings 210, which improves the structural compactness of the magnetic levitation agitator.

[0057] It is worth mentioning that, in combination with the aforementioned embodiment in which the second magnetic drive winding 220 and the first magnetic drive winding 210 are circumferentially offset on the column 100, the magnetic flux lines of the magnetic field generated by the second magnetic drive winding 220 mainly pass along the gap between the first magnetic drive winding 210. In this example, since the detection element 400 is arranged in the gap of the first magnetic drive winding 210, the interference of different magnetic fields in this area is relatively small, which is beneficial for the detection element 400 to detect the magnetic field generated by the second magnetic drive winding 220, so as to determine the magnitude of the axial driving force applied by the second magnetic control module to the outer rotor assembly 300, thereby expanding the detection benefit of the detection element 400. Based on this, it is also beneficial to adjust the magnitude of the axial driving force through feedback, thereby improving the control accuracy of the axial movement of the outer rotor assembly 300.

[0058] In the above-mentioned embodiment where the magnetic levitation stirrer includes a detection element 400, as Figure 2 , Figure 3 and Fig. 9 As shown, along the axial direction of the column 100 , the detection element 400 can be arranged corresponding to the corresponding first magnetic drive winding 210 .

[0059] It can be understood that when the outer rotor assembly 300 is in a stable suspension state (in the embodiment of the present application, the stable suspension state refers to the stable state in which the outer rotor assembly 300 maintains suspension and the speed is zero when the magnetic suspension motor does not apply additional electromagnetic force), the first magnetic control module composed of the first permanent magnet 320 and the first magnetic drive winding 210 provides suspension force and torque between it and the stator assembly 200, so in the axial direction of the column 100, when the outer rotor assembly 300 realizes the movement action, the height position corresponding to the first magnetic drive winding 210 is actually equivalent to the initial stirring position, which can be characterized by a value of 0. In this example, since the detection element 400 is set corresponding to the first magnetic drive winding 210 in the axial direction of the column 100, it is correspondingly matched with the value 0 of the initial stirring position, so when the outer rotor assembly 300 is controlled to move toward the target position, the detection element 400 detects its position change, and the data value fed back by it will also change accordingly.

[0060] In other embodiments of the present application, the detection element 400 may also be offset from the first magnetic drive winding 210 in the axial direction of the column 100, but in this case, when the outer rotor assembly 300 is in a stable suspension state, the outer rotor assembly 300 corresponds to the first magnetic drive winding 210, but the detection element 400 is not at the height position where the outer rotor assembly 300 and the first magnetic drive winding 210 are located, so the actual data value fed back by the detection element 400 will not be 0, and in order to match the state of the outer rotor assembly 300 in the initial stirring position, the data value detected by the detection element 400 at this time must be corrected, which increases the judgment and processing burden of the controller. Accordingly, this example can reduce the burden in the processing and judgment process and optimize the control efficiency and accuracy of the axial movement of the outer rotor by setting the detection element 400 in correspondence with the corresponding first magnetic drive winding 210 in the axial direction of the column 100.

[0061] Furthermore, when the stator assembly 200 has a vertically symmetrical structural layout relative to the first magnetic drive winding 210 , the detection element 400 may be disposed corresponding to the middle portion of the stator assembly 200 .

[0062] In some embodiments, the detection element 400 of the embodiment of the present application may also have the function of detecting the rotation angle of the outer rotor assembly 300 .

[0063] In an embodiment of the present application, in the same stator assembly 200, the first magnetic drive winding 210 and the second magnetic drive winding 220 are arranged axially or radially along the column 100; in the same outer rotor assembly 300, the first permanent magnet 320 and the second permanent magnet 330 are arranged axially or radially along the outer rotor assembly 300.

[0064] For example, Figure 3~Figure 7 As shown, in the same stator assembly 200, the first magnetic drive winding 210 and the second magnetic drive winding 220 are arranged along the axial direction of the column 100; at the same time, in the same outer rotor assembly 300, the first permanent magnet 320 and the second permanent magnet 330 are arranged along the axial direction of the impeller 310. It can be understood that in this example, the radial size of the stator assembly 200 is reduced, which can provide conditions for expanding the radial size of the impeller 310 in the outer rotor assembly 300 and improve the stirring effect; at the same time, since the two magnetic drive windings of the same stator assembly 200 are staggered in the axial direction of the column 100, it is also convenient for the respective wire harnesses 500 in the column 100 to be staggered in space, optimize the routing, prevent winding, etc.; furthermore, since the first permanent magnet 320 and the second permanent magnet 330 are arranged along the axial direction of the impeller 310, the radial space occupied is reduced, and adjustment is provided to increase the radial size of the impeller 310, which is conducive to improving the stirring effect.

[0065] In addition, in the magnetic levitation agitator disclosed in the embodiment of the present application, the arrangement of the first magnetic drive winding 210 and the second magnetic drive winding 220 and the arrangement of the first permanent magnet 320 and the second permanent magnet 330 can be combined with each other. The combination method and effect analysis can refer to the above examples and will not be repeated here.

[0066] In some embodiments, Fig.16 As shown, the column 100 is divided into a first column 100a and a second column 100b, and the impeller 310 of the outer rotor assembly 300 is divided into a first wheel body 310a and a second wheel body 310b. The first wheel body 310a is mounted on the outer periphery of the first column 100a. The first column 100a has an axially penetrating receiving cavity 100a1. The second column 100b is arranged in the receiving cavity 100a1. The second wheel body 310b is mounted on the outer periphery of the second column 100b, and in the axial direction of the second column 100b, the projection of the second wheel body 310b is located in the gap between the first column 100a and the second column 100b.

[0067] It can be understood that in this example, the first column 100a and the second column 100b both have the features and functions common to the column 100, and the first wheel 310a and the second wheel 310b also have the features and functions common to the impeller 310. Therefore, and based on the above structural layout, the first wheel 310a can be suspended, rotated and axially moved at the periphery of the first column 100a, and the second wheel 310b can be suspended, rotated and axially moved in the space between the second column 100b and the first column 100a. That is to say, the inner and outer impellers 310 (i.e., the first wheel 310a and the second wheel 310b) in this example can achieve the stirring effect of inner and outer nesting, and also have the ability to adjust the height position along the axial direction, so as to further improve the mixing uniformity and further expand the applicability.

[0068] Furthermore, the length of the first cylinder 100a is smaller than the length of the second cylinder 100b, and the second wheel 310b can move along the second cylinder 100b to the part of the second cylinder 100b extending out of the first cylinder 100a. It can be understood that under such a layout, the magnetic levitation stirrer will have at least the following two working states: in the first working state, the second wheel 310b moves to the corresponding overlapping range of the first cylinder 100a and the second cylinder 100b to achieve the stirring effect of the first wheel 310a and the second wheel 310b being nested inside and outside; in the second working state, the second wheel 310b can move out of the range blocked by the first cylinder 100a, that is, extend out from the gap between the first cylinder 100a and the second cylinder 100b, so that the second wheel 310b can directly contact the external stirred object.

[0069] In the first working state, stirring can be performed in the area near the column 100, reducing the risk of material accumulation in the area of ​​the column 100 in the related art. In the second working state, the second wheel body 310b moves to the position where the second column 100b extends out of the first column 100a, expanding the stirring range of the outer rotor assembly 300.

[0070] Furthermore, the second column 100b extends out from the top of the first column 100a, so that the second wheel 310b (which is smaller in size) can stir at the top of the column 100, and the material at the top is less gathered due to gravity, so the stirring force required is not high; the first wheel 310a is still used to stir at the bottom of the column 100, and its size is larger, which can meet the stirring needs of the material gathered due to gravity.

[0071] In another further embodiment, the first cylinder 100a has a communication port, and the communication port connects the gap with the outside of the first cylinder 100a. It can be understood that in this example, the first cylinder 100a is connected to the inside and outside through the connection structure, so that the material entering the gap between the first cylinder 100a and the second cylinder 100b can flow to the outside, avoiding the accumulation of materials in the gap between the first cylinder 100a and the second cylinder 100b, and improving the mixing uniformity.

[0072] The communication port may be a hollow window that passes through the first column 100 a , and there are multiple hollow windows that are evenly distributed.

[0073] In the case where the first cylinder 100a has the above-mentioned connecting port, the magnetic levitation stirrer may include at least one set of stator assemblies 200 correspondingly arranged at the same axial position of the first cylinder 100a and the second cylinder 100b. It can be understood that under such a layout, the first wheel body 310a and the second wheel body 310b can be driven to the same height position via the corresponding second magnetic drive module, and the stirring operation can be performed at the same height position to optimize the stirring effect at a specific height position in the stirred object, thereby improving the mixing uniformity of the stirred object. It can be seen that this example can realize the internal and external nested stirring operation at the same height position, and can be used in scenes with particularly high requirements for mixing uniformity.

[0074] In some embodiments, Figure 3~Figure 7 As shown, in the same stator assembly 200, along the axial direction of the column 100, the second magnetic drive winding 220 is arranged on both sides of the first magnetic drive winding 210, and the second magnetic drive winding 220 on both sides of the first magnetic drive winding 210 is symmetrically distributed relative to the first magnetic drive winding 210; in the same outer rotor assembly 300, along the axial direction of the impeller 310, the second permanent magnet 330 is arranged on both sides of the first permanent magnet 320, and the second permanent magnet 330 on both sides of the first permanent magnet 320 is symmetrically distributed relative to the first permanent magnet 320.

[0075] It can be understood that under such a layout, in the outer rotor assembly 300, the first permanent magnet 320 is located in the middle, and the second permanent magnets 330 symmetrically distributed on both sides of the first permanent magnet 320 can achieve relative balance, preventing the outer rotor assembly 300 from being skewed as a whole during suspension, rotation and axial movement.

[0076] Based on the above structural layout, the stator assembly 200 is provided with a second magnetic drive winding 220 on both the upper and lower sides of the first magnetic drive winding 210, so that two groups of second magnetic control modules can be formed with the outer rotor assembly 300, so that axial driving force can be applied on the upper and lower sides of the outer rotor assembly 300, thereby optimizing the driving effect; at the same time, compared with the second magnetic drive winding 220 being set on one side, it can avoid the situation where the magnetic field effect is poor due to the distance from the second permanent magnet 330 is too far, and there is no need to take measures such as increasing the number of coil turns of the second magnetic drive winding 220 to strengthen the magnetic field, which will increase costs.

[0077] In addition, the structural layout of this example constructs two groups of second magnetic control modules. When suspension control is achieved between the outer rotor assembly 300 and the stator assembly 200, the second magnetic control modules can provide axial constraints on the outer rotor assembly 300 to prevent its axial movement.

[0078] For further information, please refer to Fig. 9 , when the outer rotor assembly 300 is in the initial stirring position, along the axial direction of the column 100, the corresponding second permanent magnets 330 and the second magnetic drive winding 220 are staggered. Based on this structural layout, one of the second magnetic control modules can apply an axial suction force distributed along the moving direction to the outer rotor assembly 300, and the other second magnetic control module can apply an axial repulsion force distributed along the moving direction to the outer rotor assembly 300. In this way, the axial suction force and the axial repulsion force distributed along the moving direction of the outer rotor assembly 300 are superimposed, and the outer rotor assembly 300 is jointly driven to move along the column 100, thereby improving the driving control efficiency.

[0079] For example, Fig.10 As shown, the second permanent magnet 330 of the outer rotor assembly 300 and the second magnetic drive winding 220 of the corresponding stator assembly 200 are axially misaligned but partially overlapped, wherein the magnetic flux lines of the second permanent magnet 330 on the upper side of the outer rotor assembly 300 and the corresponding second magnetic drive winding 220 are externally closed, so a suction force toward the center is generated between them, and the axial component of the suction force drives the outer rotor assembly 300 to move axially downward, that is, toward another stator assembly 200. It is worth noting that the radial component of the outer rotor assembly 300 is usually offset and can be ignored.

[0080] Among them, the second permanent magnet 330 on the lower side of the outer rotor assembly 300 and its corresponding second magnetic drive winding 220 have a self-closed relationship in their magnetic flux lines, so a repulsive force away from the center will be generated between them. The axial component of the repulsive force drives the outer rotor assembly 300 to move axially downward, that is, toward the other stator assembly 200.

[0081] refer to Fig.11 , Fig.13 and Fig.14 , in the process of driving the outer rotor assembly 300 to move to the target stirring position through the second magnetic control module, among the two second permanent magnets 330, at least one is located between the two second magnetic drive windings 220 along the axial direction of the column 100, and is simultaneously applied with axial repulsion and axial attraction distributed along the moving direction. It can be understood that when the second permanent magnet 330 of the outer rotor assembly 300 is axially located between the two second magnetic drive windings 220 of the same stator assembly 200 or two adjacent stator assemblies 200, the second permanent magnet 330 can form two second magnetic control modules with the two second magnetic drive windings 220 on the upper and lower sides, and the two second magnetic control modules can jointly apply axial driving force to the second permanent magnet 330, that is, the outer rotor assembly 300 is jointly driven to move along the axial direction of the column 100 through the axial repulsion (actually the axial component of the repulsion) and the axial attraction (actually the axial component of the attraction), thereby improving the driving control efficiency.

[0082] For example, in Fig.11 In the illustrated embodiment, the second permanent magnet 330 on the lower side of the outer rotor assembly 300 is axially offset and non-overlapping with the second magnetic drive winding 220 adjacent to the upper side. Based on the principle that like magnetic poles repel each other, the N poles repel each other, and the second permanent magnet 330 is subjected to axial repulsion. At the same time, the second permanent magnet 330 is axially offset and non-overlapping with the second magnetic drive winding 220 adjacent to the lower side. Based on the principle that unlike magnetic poles attract each other, the N poles attract each other, and the second permanent magnet 330 is subjected to axial attraction.

[0083] In some embodiments, before the outer rotor assembly 300 is driven by the second magnetic control module, the rotation speed of the outer rotor assembly 300 is reduced to zero through the corresponding stator assembly 200 according to the speed control strategy. The speed control strategy refers to applying torque to the outer rotor assembly 300 through the stator assembly 200 based on a control algorithm related to speed control, and controlling and adjusting the speed of the outer rotor assembly 300.

[0084] It should be understood that in this example, by adjusting the rotation speed of the outer rotor assembly 300 to zero, the outer rotor assembly 300 can be prevented from being affected by torque during the axial movement along the column 100, and in particular, the outer rotor assembly 300 can be prevented from being deflected and swung due to torque.

[0085] In some embodiments, in the axial direction of the column 100, the first magnetic drive windings 210 in two adjacent stator assemblies 200 are staggered along the circumferential direction. Under such a layout, when the outer rotor assembly 300 rotates toward a stable suspension state at the target stirring position, the outer rotor assembly 300 is driven to reach a preset speed according to the speed control strategy.

[0086] It should be understood that in the process of the outer rotor assembly 300 moving from the position corresponding to one stator assembly 200 to the position corresponding to another stator assembly 200, a stable suspension state is formed between the first magnetic drive winding 210 of the first stator assembly 200 and the first permanent magnet 320 of the outer rotor assembly 300 before axial displacement. In this example, through the above-mentioned structural layout, when the outer rotor assembly 300 moves to a position close to the corresponding position of the rear stator assembly 200, the first magnetic drive winding 210 of the rear stator assembly 200 and the first permanent magnet 320 of the outer rotor assembly 300 are not in a stable suspension state, but a torque is applied to the outer rotor assembly 300 to make the two tend to a stable suspension state. In the process of the outer rotor assembly 300 rotating toward the stable suspension state relying on the torque, the control method of the embodiment of the present application can drive the outer rotor assembly 300 to reach a preset speed based on the speed control strategy, thereby reducing the energy consumption of the magnetic levitation agitator to a certain extent.

[0087] See also Figure 1 to Figure 16 Some embodiments of the present application provide a stirring container, which includes the magnetic levitation agitator mentioned above, thereby having the beneficial effects of the magnetic levitation agitator mentioned above, which will not be repeated here.

[0088] Typically, the stirring container includes a container shell 600, and a magnetic suspension stirrer is disposed in the container shell 600 to perform stirring operations in a stirring chamber 620 in the container shell 600. For example, Figure 1 As shown, the container shell 600 includes a second cover body 610 , and the second cover body 610 is detachably connected to the main body of the container shell 600 , so that it is convenient to disassemble and assemble the magnetic suspension stirrer in the container shell 600 .

[0089] The stirring container involved in the embodiments of the present application may be a drug liquid stirring tank, a bioreactor, a cell culture container, etc. The embodiments of the present application do not specifically limit the type of the stirring container.

[0090] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0091] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A magnetic levitation stirrer, characterized in that: It includes a column, a stator assembly and an outer rotor assembly, wherein: The stator assembly comprises a first magnetic drive winding and a second magnetic drive winding arranged on the column, and there are at least two stator assemblies, each of which is distributed along the axial direction of the column; The outer rotor assembly is sleeved on the outer periphery of the column, and the outer rotor assembly includes a first permanent magnet and a second permanent magnet; The first magnetic drive winding and the first permanent magnet constitute a first magnetic control module, which is used to apply torque and suspension force to the outer rotor assembly; the second magnetic drive winding and the second permanent magnet constitute a second magnetic control module, which is used to apply an axial driving force to the outer rotor assembly to drive the outer rotor assembly to move between positions corresponding to different stator assemblies.

2. The magnetic levitation stirrer according to claim 1, characterized in that: There are multiple first magnetic drive windings, which are evenly arranged along the circumference of the column, and there are multiple second magnetic drive windings, which are evenly arranged along the circumference of the column; in the circumference of the column, the first magnetic drive windings and the second magnetic drive windings are staggered.

3. The magnetic levitation stirrer according to claim 1, characterized in that: In the same stator assembly, along the axial direction of the column, the center distance between the second magnetic drive winding and the first magnetic drive winding is a first distance; in the same outer rotor assembly, along its axial direction, the center distance between the second permanent magnet and the first permanent magnet is a second distance; the first distance is not equal to the second distance.

4. The magnetic levitation stirrer according to claim 1, characterized in that: The second permanent magnet is a magnetic ring, which is arranged around the axial direction of the outer rotor assembly; or, the second permanent magnet includes a plurality of permanent magnet units, which are evenly distributed along the circumference of the outer rotor assembly.

5. The magnetic levitation stirrer according to any one of claims 1 to 4, characterized in that: The magnetic levitation stirrer further comprises a detection element arranged corresponding to the stator assembly, and the detection element is used to detect the axial position of the outer rotor assembly; wherein: There are multiple first magnetic drive windings, which are evenly arranged along the circumference of the column, and the detection element is arranged in the area between adjacent first magnetic drive windings; and / or, along the axial direction of the column, the detection element is correspondingly arranged with the corresponding first magnetic drive winding.

6. The magnetic levitation stirrer according to any one of claims 1 to 4, characterized in that: In the same stator assembly, the first magnetic drive winding and the second magnetic drive winding are arranged axially or radially along the column; in the same outer rotor assembly, the first permanent magnet and the second permanent magnet are arranged axially or radially along the outer rotor assembly.

7. The magnetic levitation stirrer according to any one of claims 1 to 4, characterized in that: The column is divided into a first column and a second column, the outer rotor assembly includes an impeller, the impeller is divided into a first wheel body and a second wheel body, the first wheel body is sleeved on the outer periphery of the first column, the first column has a receiving cavity that penetrates along the axial direction, the second column is arranged in the receiving cavity, the second wheel body is sleeved on the outer periphery of the second column, and in the axial direction of the second column, the projection of the second wheel body is located in the gap between the first column and the second column; wherein: The length of the first cylinder is smaller than that of the second cylinder, and the second wheel can move along the second cylinder to the part of the second cylinder extending out of the first cylinder; and / or, the first cylinder has a connecting opening, and the connecting opening connects the gap with the outside of the first cylinder.

8. The magnetic levitation stirrer according to claim 7, characterized in that: In the case where the first column has the communication port, the magnetic levitation stirrer includes at least one set of stator components correspondingly arranged at the same axial position of the first column and the second column.

9. The magnetic levitation stirrer according to any one of claims 1 to 4, characterized in that: In the same stator assembly, along the axial direction of the column, the second magnetic drive winding is arranged on both sides of the first magnetic drive winding, and the second magnetic drive windings on both sides of the first magnetic drive winding are symmetrically distributed relative to the first magnetic drive winding; In the same outer rotor assembly, along the axial direction of the outer rotor assembly, the second permanent magnets are arranged on both sides of the first permanent magnet, and the second permanent magnets on both sides of the first permanent magnet are symmetrically distributed relative to the first permanent magnet.

10. A stirring container, characterized in that: A magnetic levitation stirrer comprising any one of claims 1 to 9.

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