Magnetic suspension motor and stirrer

Abstract

The utility model relates to the field of fluid stirring equipment, in particular to a magnetic suspension motor and a stirrer, the magnetic suspension motor comprises a motor shell, a stator, a rotor and a displacement sensor, the center of one end of the motor shell is recessed inwards to form a groove, the rotor is rotatably arranged in the groove in a suspended manner, and the outer side of the groove protrudes outwards along the axis of the motor to form a boss; the stator comprises a first magnet yoke, a coil and a second magnet yoke, one end of the first magnet yoke is connected with the second magnet yoke, the other end of the first magnet yoke and the displacement sensor are arranged in the bosses, the coil is wound in the middle of the first magnet yoke, the bosses are arranged at intervals, and gaps are formed between the inner side walls of the bosses and the outer side wall of the rotor; the gap is communicated with the outside of the motor through the interval. According to the utility model, the communicated channel is arranged between the motor rotor and the boss, so that the interior of the action part of the motor is communicated with the peripheral area, and the stirring dead angle in the stirring tank is effectively eliminated.

Description

Technical Field

[0001] The utility model relates to the field of fluid stirring equipment, in particular to a magnetic levitation motor and a stirrer. Background Art

[0002] In the field of biopharmaceuticals, especially in the process of mixing and treating biological cell culture media, the performance of the stirring device directly affects the consistency of the cell growth environment and the culture efficiency. Traditional stirring technologies have evolved to use magnetic levitation bearingless motors to drive the stirring impellers to achieve contactless and frictionless stirring, thereby reducing mechanical wear and lowering the risk of contamination. Such stirrers on the market usually include a stirring tank with a cylindrical groove designed at the bottom, and a stirring impeller embedded with permanent magnets is installed inside the groove. The corresponding magnetic levitation bearingless motor is fitted on the corresponding boss outside the stirring tank and drives the impeller to rotate through the action of magnetic field force.

[0003] Although this magnetic levitation stirring technology has significant advantages over traditional mechanical stirring, a key problem has been found in practical applications. Due to the design limitations of the existing motor structure and the stirring tank, a stirring dead zone that is difficult to reach is formed in the groove area at the bottom of the tank. The mixing effect of the culture medium in this area is poor, and problems such as uneven distribution of local nutrients or accumulation of metabolic wastes may occur during the cell culture process. This not only affects the overall quality of the culture medium and the reaction process but also limits the precise control and optimization of the biopharmaceutical process. Summary of the Utility Model

[0004] The utility model aims to solve the above problems and provides a magnetic levitation motor and a stirrer, and the technical solutions adopted are as follows:

[0005] A magnetic levitation motor includes a motor housing, a stator, a rotor, and a displacement sensor. A groove is recessed inwardly at the center of one end of the motor housing. The rotor is suspended and rotatably arranged in the groove. A boss protrudes outward along the axis of the motor outside the groove. The stator includes a first magnetic yoke, a coil, and a second magnetic yoke. One end of the first magnetic yoke is connected to the second magnetic yoke. The other end of the first magnetic yoke and the displacement sensor are arranged in the boss. The coil is wound around the middle of the first magnetic yoke. The number of the bosses is multiple, and intervals are provided between the bosses. A gap is formed between the inner side wall of the boss and the outer side wall of the rotor, and the gap communicates with the outside of the motor through the interval.

[0006] On the basis of the above solution, the number of the first magnetic yokes accommodated in each boss is multiple.

[0007] On the basis of the above solution, the bending parts of 2 first magnetic yokes are accommodated in each boss, and the displacement sensor is arranged between the 2 first magnetic yokes in each boss.

[0008] Preferably, the number of the first yokes disposed in each boss cavity is 1.

[0009] Preferably, the bosses are evenly distributed along the circumferential direction of the motor, and the intervals between adjacent bosses are the same.

[0010] Preferably, the number of the first yokes is multiple and they are evenly distributed circumferentially in the motor housing; further included is a yoke pressing plate which is fixedly installed on the inner side of the lower housing, and the first yokes are clamped on the yoke pressing plate.

[0011] Preferably, the side of the rotor facing the bottom of the groove bulges outwards to form back blades, and grooves are formed between adjacent back blades.

[0012] Preferably, the coil includes a suspension winding and a driving winding, or the coil is a suspension-driving integrated winding.

[0013] Preferably, the rotor includes a core part and a rotor housing wrapping the core part, and the core part is made of a permanent magnet or a soft magnetic material.

[0014] A dead zone-free stirrer includes a stirring tank, stirring blades and the above-mentioned magnetic suspension motor. The magnetic suspension motor is assembled on the stirring tank. The stirring tank bulges inwards at the assembly position to form a clamping groove, and the shape of the clamping groove corresponds to that of the boss. The boss is clamped with the clamping groove and is placed outside the stirring tank. The rotor is arranged in the cavity between the clamping grooves on the inner side of the stirring tank. The stirring blades are fixedly connected to the rotor housing and are arranged towards the inner side of the stirring tank.

[0015] On the basis of the above solution, the magnetic suspension motor is installed on the bottom surface, side surface or top surface of the stirring tank.

[0016] The beneficial effects of the present utility model are as follows: By improving the motor housing mechanism, a communicating channel is provided between the motor rotor and the boss, so that the interior of the moving part of the motor is interconnected with the surrounding area; the motor is fitted on the stirring tank through the clamping groove of the stirring tank, and there is a communicating path between the rotor and the tank body at the assembly position, effectively eliminating the stirring dead zone in the stirring tank, ensuring that the biological cell culture solution can be evenly and fully stirred throughout the tank body, and further improving the reliability and refinement degree of the biopharmaceutical process. Description of the Drawings

[0017] Figure 1 : Structural schematic diagram of the magnetic suspension motor of the present utility model;

[0018] Figure 2 : Cross-sectional view of the magnetic suspension motor of the present utility model;

[0019] Figure 3 : Structural schematic diagram of the magnetic suspension motor of the present utility model when the number of bosses is 3;

[0020] Figure 4 : Schematic structural diagram of the stirrer of the present utility model;

[0021] Figure 5 : Cross-sectional view of the assembly position of the stirrer of the present utility model;

[0022] Figure 6 : Schematic structural diagram of the card slot of the mixing tank of the present utility model;

[0023] Figure 7 : Schematic diagram of the liquid flow path during the stirring process of the stirrer of the present utility model;

[0024] Figure 8 : Schematic diagram of the liquid flow path around the boss during the stirring process of the stirrer of the present utility model;

[0025] Figure 9 : Schematic diagram of the liquid flow path from around the rotor to the outside of the stirrer during the stirring process of the stirrer of the present utility model;

[0026] Figure 10 : Schematic structural diagram of the back vane of the present utility model;

[0027] Figure 11 : Second schematic structural diagram of the back vane of the present utility model;

[0028] Figure 12 : Schematic top view of Embodiment 8 of the present utility model. Detailed implementation manners

[0029] The present utility model will be further described below with reference to the accompanying drawings and embodiments:

[0030] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0032] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0033] Embodiment 1

[0034] As Figure 1 and Figure 2 shown, a magnetic levitation motor includes a motor housing, a stator, a rotor and a displacement sensor. A groove is recessed inward at the center of one end of the motor housing. The rotor is suspended and rotatably disposed in the groove, and the rotor does not contact the bottom or side surface of the groove. The rotor includes a core portion 31 and a rotor housing 32 wrapping the core portion 31. The core portion 31 is made of a permanent magnet or a soft magnetic material. A boss 13 protrudes outward along the axis of the motor on the outside of the groove. The number of the bosses 13 is multiple, and a gap 15 is provided between the bosses 13. A gap 14 is formed between the inner side wall of the boss 13 and the outer side wall of the rotor. The gap 14 communicates with the outside of the motor through the gap 15. Specifically, the motor housing includes a lower housing 11 and an upper housing 12. The lower housing 11 and the upper housing 12 enclose a closed chamber. The groove and the boss 13 are provided on the upper housing 12, and the upper edge of the lower housing 11 is lower than the upper edge of the boss 13.

[0035] The stator includes a first yoke 21, a coil 23 and a second yoke 24. The second yoke 24 is annular and is installed on the side of the lower housing 11 away from the upper housing 12. One end of the first yoke 21 is connected to the second yoke 24, and the other end of the first yoke 21 is bent inward in the radial direction of the motor to form an L shape. The number of the first yokes 21 is multiple and they are circumferentially evenly distributed in the motor housing. The coil 23 is wound around the middle of the first yoke 21, between the connection end and the bent part of the first yoke 21 and the second yoke 24. The coil 23 includes a suspension winding and a driving winding, or the coil 23 is a suspension-driving integrated winding, which is used to drive the rotor to suspend and rotate relative to the stator.

[0036] The L-shaped bent part of the first yoke 21 and the displacement sensor are arranged in the boss 13. The number of the first yokes 21 accommodated in each boss 13 is multiple. Preferably, the number of the bent parts of the first yokes 21 accommodated in each boss 13 is 2, and the displacement sensor is arranged between the 2 first yokes 21 in each boss 13. For example, if the number of the first yokes 21 is 8, the number of the bosses 13 is correspondingly set to 4. Preferably, the multiple bosses 13 are circumferentially evenly distributed, and the intervals between adjacent bosses 13 are the same.

[0037] To position and fix the first yoke 21, a yoke pressing plate 22 is further included. The yoke pressing plate 22 is fixedly installed on the inner side of the lower housing 11, and the first yoke 21 is clamped on the yoke pressing plate 22 to ensure the circularity of the first yoke 21. Preferably, the upper edge of the yoke pressing plate 22 is not higher than the upper edge of the lower housing 11.

[0038] As Figures 4 to 6 shown, a stirrer without dead zone includes a stirring tank 41, stirring blades 43 and the above-mentioned magnetic levitation motor. The magnetic levitation motor is assembled on the stirring tank 41. The stirring tank 41 protrudes inward at the assembly position to form a clamping groove 42. The clamping groove 42 is correspondingly shaped with the boss 13. The boss 13 is clamped with the clamping groove 42 and is placed outside the stirring tank 41, so that the motor is closely attached to the stirring tank 41. The rotor is arranged in the accommodating cavity between the clamping grooves 42 on the inner side of the stirring tank 41. There is a gap between the rotor and each clamping groove 42 and it does not contact the bottom of the accommodating cavity. Intervals are provided between the clamping grooves 42, so as to ensure that the regions at the assembly position of the stirring tank 41 are interconnected with each other, completely avoiding the existence of stirring dead zones. The stirring blades 43 are fixedly connected to the rotor housing 32 by welding, bonding or integral molding, etc., and are arranged towards the inner side of the stirring tank 41. The rotor housing 32 is made of PC, PP, PA, PFA, PTFE or TPU materials. The motor drives the rotor to suspend and rotate, and then drives the stirring blades 43 to rotate continuously to play a stirring role. The inside and outside of the clamping groove 42 are interconnected, ensuring the liquid circulation and continuous rotation during the stirring process, effectively avoiding the problem of uneven stirring caused by the stirring dead zone.

[0039] Specifically, as Figures 7 to 9 shown, the liquid below the stirring blade 43 rotates and flows out from the interval 15 through the gap 14 under the action of centrifugal force, and mixes with the liquid outside the stirrer; the stirring blade 43 periodically sweeps over the interval 15, strengthening the mixing of the liquid at the interval 15 and the liquid outside the stirrer. Through the above structure and actions, the mixing and convection of the liquid below the stirring blade 43 and the liquid outside the stirrer are strengthened, avoiding the formation of a flow dead zone below the stirring blade 43 and causing adverse effects such as particle accumulation.

[0040] Preferably, as Figure 10 and Figure 11 shown, a back blade 33 protrudes outward on one side of the rotor facing the bottom of the groove, and a groove is formed between adjacent back blades 33. The back blade 33 stirs the liquid between the rotor and the bottom of the groove, forming a turbulent flow inside and near the groove to enhance the liquid flow. The shapes of the back blade 33 and the groove are various. As Figure 10 shown, the back blade 33 is approximately rectangular, and the groove shape is fan-shaped. As Figure 11 shown, the back blade 33 is fan-shaped, and the groove shape is approximately rectangular. In addition, the area ratio of the back blade 33 to the groove can be adjusted according to actual needs.

[0041] Preferably, the connection position between the clamping groove 42 and the mixing tank 41 has a circular arc transition, reducing the resistance of the liquid flowing through the connection position, reducing the local flow velocity change, and avoiding the formation of a dead zone.

[0042] Preferably, the magnetic levitation motor is installed at the central position of the bottom of the mixing tank 41 to improve the mixing effect.

[0043] Embodiment 2

[0044] The difference between this embodiment and Embodiment 1 is that the number of the first magnetic yokes 21 can be 6, 12, 24, etc., which are selected according to the actual motor performance requirements. The corresponding number of the convex platforms 13 is 3, 6, 12, etc. As Figure 3 shown.

[0045] Embodiment 3

[0046] The difference between this embodiment and Embodiment 1 is that the number of the first magnetic yokes 21 accommodated in each convex platform 13 is 1, thereby forming more intervals 15 and more liquid flow channels. The displacement sensors are arranged in pairs and circumferentially evenly distributed, and each displacement sensor and the adjacent first magnetic yoke 21 are wrapped in the same convex platform 13.

[0047] Embodiment 4

[0048] The difference between this embodiment and Embodiment 3 is that each displacement sensor is respectively arranged in its own boss 13, and there is a gap 15 between the boss 13 wrapping the displacement sensor and the adjacent boss 13 wrapping the first yoke 21.

[0049] Embodiment 5

[0050] The difference between this embodiment and Embodiments 1-4 is that the magnetic levitation motor is installed at the center position of the top surface of the mixing tank 41, which can directly drive the liquid to move downward, improve the uniformity of material mixing, and at the same time facilitate the installation and maintenance of the magnetic levitation motor.

[0051] Embodiment 6

[0052] The difference between this embodiment and Embodiment 5 is that the magnetic levitation motor is eccentrically installed on the top or bottom surface of the mixing tank 41, which can meet the installation requirements of different shapes of the mixing tank 41 and at the same time meet the need for accelerated flow in a specific area.

[0053] Embodiment 7

[0054] The difference between this embodiment and Embodiments 1-4 is that the magnetic levitation motor is installed on the side wall of the mixing tank 41 to meet various installation and mixing requirements.

[0055] Embodiment 8

[0056] As Figure 1 and Figure 12 shown, the difference between this embodiment and the above embodiments is that the shape of the gap 15 between adjacent bosses 13 can be a sector, a rectangle or other shapes.

[0057] The above has illustrated the present invention by way of example, but the present invention is not limited to the above specific embodiments. Any modification or variation based on the present invention falls within the scope of protection required by the present invention.

Claims

1. A magnetic levitation motor, characterized in that: The invention comprises a motor housing, a stator, a rotor and a displacement sensor. A groove is formed inwardly at the center of one end of the motor housing. The rotor is rotatably arranged in the groove in a suspended manner. The outer side of the groove protrudes outwardly along the axis of the motor to form a boss (13). The stator comprises a first magnetic yoke (21), a coil (23) and a second magnetic yoke (24). One end of the first magnetic yoke (21) is connected to the second magnetic yoke (24). The other end of the first magnetic yoke (21) and the displacement sensor are arranged in the boss (13). The coil (23) is wound around the middle of the first magnetic yoke (21). There are a plurality of bosses (13), and intervals (15) are arranged between the bosses (13). A gap (14) is formed between the inner side wall of the boss (13) and the outer side wall of the rotor. The gap (14) is connected to the outside of the motor through the interval (15).

2. A magnetic levitation motor according to claim 1, characterized in that: There are multiple first magnetic yokes (21) housed in each boss (13).

3. A magnetic levitation motor according to claim 2, characterized in that: Each boss (13) contains two bent portions of the first magnetic yokes (21), and the displacement sensor is arranged between the two first magnetic yokes (21) in each boss (13).

4. The magnetic levitation motor according to claim 1, characterized in that: The number of first magnetic yokes (21) housed in each boss (13) is one.

5. The magnetic levitation motor according to claim 1, characterized in that: The bosses (13) are evenly distributed along the circumference of the motor, and the intervals between adjacent bosses (13) are the same.

6. The magnetic levitation motor according to claim 1, characterized in that: There are a plurality of first magnetic yokes (21) which are evenly distributed in the circumferential direction in the motor housing. The motor also includes a yoke pressing plate (22) which is fixedly mounted on the inner side of the lower housing (11) and on which the first magnetic yokes (21) are clamped.

7. The magnetic levitation motor according to claim 1, characterized in that: The rotor protrudes outwards towards one side of the bottom of the groove to form a back blade (33), and grooves are formed between adjacent back blades (33).

8. The magnetic levitation motor according to claim 1, characterized in that: The coil (23) comprises a suspension winding and a drive winding, or the coil (23) is a suspension drive integrated winding.

9. The magnetic levitation motor according to claim 1, characterized in that: The rotor comprises a core (31) and a rotor shell (32) encapsulating the core (31); the core (31) is made of a permanent magnet or a soft magnetic material.

10. A stirrer, characterized in that: The invention comprises a stirring tank (41), a stirring blade (43), and a magnetic levitation motor according to any one of claims 1 to 9, wherein the magnetic levitation motor is mounted on the stirring tank (41), and the stirring tank (41) is provided with a slot (42) protruding toward the inner side of the stirring tank (41) at the assembly position, the slot (42) being arranged corresponding to the shape of the boss (13), the boss (13) being engaged with the slot (42) and being arranged outside the stirring tank (41), the rotor being arranged in a receiving cavity between the slots (42) inside the stirring tank (41), and the stirring blade (43) being fixedly connected to the rotor housing (32) and being arranged toward the inner side of the stirring tank (41).

11. A stirrer according to claim 10, characterized in that: The magnetic suspension motor is installed on the bottom surface, side surface or top surface of the stirring tank (41).

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