A magnetic levitation motor and a submersible agitator

Abstract

The present invention relates to a magnetic levitation motor and a submersible agitator, comprising: an annular rotor and a stator assembly. Two annular rotors are coaxially arranged in the up-and-down direction. The two annular rotors have the same number of magnetic poles, and the magnetic pole arrangement directions of the two annular rotors are the same or opposite. The relative positions of the two annular rotors are fixed. The two annular rotors are respectively sleeved outside the stator assembly, and the stator assembly drives the two annular rotors to levitate and rotate by magnetic force. The axial drive assembly of the present invention can give an additional axial force to the rotating cylinder. After the rotating cylinder axially deviates, it drives the rotating cylinder to return to the normal position; the installation cavity isolates the stator assembly from the outside world, and the rotating cylinder isolates the annular rotor from the outside world, avoiding contamination of the external medium and also avoiding corrosion of the stator assembly and the annular rotor by the external medium.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic levitation devices, and in particular to a magnetic levitation motor and a submersible agitator. Background Art

[0002] Due to usage requirements, the volume occupied by the magnetic levitation device in the existing agitator cannot be too large, so a thin-sheet type magnetic levitation motor is usually adopted.

[0003] For the existing thin-sheet type magnetic levitation motor, due to volume limitations, the output power is small. Moreover, its ability to control the axial movement of the rotating cylinder is poor, and the rotating cylinder is prone to excessive deviation, affecting normal use.

[0004] The existing submersible agitator is integrally formed and cannot change the position of the stirring blades, so it cannot adapt to containers with different depths.

[0005] For some submersible agitators with multiple groups of stirring blades, the speed ratio of different groups of stirring blades is fixed and cannot be changed according to different stirred fluids, and the stirring effect cannot be further improved. Summary of the Invention

[0006] The present invention aims to solve the above problems and provides a magnetic levitation motor and a submersible agitator, which solve the above technical problems.

[0007] A magnetic levitation motor includes: an annular rotor, a rotating cylinder, and a stator assembly. Two annular rotors are coaxially arranged in the up and down directions, and the two annular rotors have the same number of magnetic poles. The two annular rotors are respectively fixedly connected to the rotating cylinder. The rotating cylinder and the two annular rotors are respectively sleeved outside the stator assembly, and the stator assembly drives the two annular rotors to rotate through magnetic force.

[0008] Further, the stator assembly includes a first magnetic yoke and a coil group. The coil group is sleeved and fixed outside the first magnetic yoke, and the first magnetic yoke is arranged in a circumferential uniform distribution.

[0009] Further, the first magnetic yoke includes an axial arm and a radial arm. The upper and lower ends of the axial arm are respectively fixedly connected to the radial arm. The radial arm protrudes outward and is located radially inside the annular rotor, and the coil group is sleeved outside the axial arm.

[0010] Further, the coil group includes a suspension coil and a rotation coil. The suspension coil and the rotation coil are respectively sleeved outside the first magnetic yoke. The rotation coil is used to drive the annular rotor to rotate, and the suspension coil and the rotation coil jointly drive the annular rotor to levitate.

[0011] Further, the magnetic pole arrangement directions of the two annular rotors are opposite.

[0012] Further, it further includes a second yoke. The magnetic pole arrangement directions of the two annular rotors are the same. The first yoke passes through the second yoke and is fixed to the second yoke. The two coil groups corresponding to each first yoke are respectively located on the upper and lower sides of the second yoke, and the second yoke is annular.

[0013] Further, the rotating cylinder is made of non-magnetic material, and the inner cavity of the rotating cylinder is vertically through.

[0014] An immersed stirring device using the magnetic levitation motor further includes a motor housing. The motor housing is made of non-magnetic material. The stator assembly is located inside the motor housing and is fixedly connected to the motor housing. Blades are formed on the outer side of the rotating cylinder. The rotating cylinder is sleeved on the outer side of the motor housing. A plurality of motor housings are arranged in a straight line along the same axis. The positions of the motor housings are fixed and detachable.

[0015] Further, an annular boss is formed on the outer side of the motor housing. The annular boss is located below the rotating cylinder, and the annular boss is used to limit the axial displacement of the rotating cylinder;

[0016] It further includes a first magnetic component and a second magnetic component. The first magnetic component is fixedly connected to the annular boss, the second magnetic component is fixedly connected to the rotating cylinder, and the first magnetic component drives the second magnetic component to move axially through magnetic force.

[0017] Further, it further includes a connecting pipe. The connecting pipe and the motor housing are arranged in a straight line along the same axis. Adjacent two pipe fittings are fixedly and detachably connected. The pipe fittings include the motor housing and the connecting pipe;

[0018] It further includes an end cover. The connecting pipe and the motor housing are both vertically through. The end cover is detachably connected to the lower end of the lowermost pipe fitting.

[0019] The present invention has the following advantages:

[0020] 1. Each of the two radial arms corresponds to an annular rotor, which increases the total electromagnetic force received by the annular rotor. Therefore, when the motor has the same size, it provides greater power for the main shaft, and further increases the rotation speed of the blade;

[0021] 2. Each of the two radial arms applies electromagnetic force to the corresponding annular rotor, so that there are two magnetic force supports for the rotating cylinder, with smaller offset and more stable position of the rotating cylinder;

[0022] 3. By providing the second yoke, two independent magnetic circuits are formed, upper and lower. Different coil groups above and below can change the forces on the two annular rotors by passing different magnitudes of current. Therefore, when the rotating cylinder deflects with the radial direction as the axis, two forces with different magnitudes are given to both ends of the rotating cylinder, causing the rotating cylinder to deflect in the opposite direction and recover, improving the stability of the rotating cylinder during rotation;

[0023] 4. The axial drive assembly can apply an additional axial force to the rotating cylinder. After the axial offset of the rotating cylinder, it drives the rotating cylinder to return to the normal position.

[0024] 5. By using different numbers of pipe bodies, the number and axial position of the rotating cylinders can be changed, so as to be adjusted according to the situation of the container, improving the adaptability of the submerged agitator to different containers.

[0025] 6. Each rotating cylinder is driven by a stator assembly in its corresponding motor housing. The rotation speed and rotation direction of each rotating cylinder can be adjusted. The rotation speeds, speed ratios and rotation directions of the rotating cylinders with blades can be adjusted according to the situation of the fluid, improving the stirring effect on different fluids.

[0026] 7. Due to the adoption of the magnetic levitation structure, compared with the agitator with bearings, the cleanliness is improved, and the damage to cells is reduced when used as a biological agitator.

[0027] 8. At the same time, since there is no complex connection structure between the rotating cylinder and the motor housing, for the agitator, the possibility of dirt accumulation is reduced, effectively reducing the difficulty of subsequent cleaning of the inside of the agitator.

[0028] 9. The sizes, shapes and numbers of the blades of the rotating cylinders matched with the series-connected multiple motor housings can be different to improve the stirring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only one embodiment of the present invention. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0030] Figure 1 : Three-dimensional structure schematic diagram of the magnetic levitation device (without the second yoke);

[0031] Figure 2 : Figure 1 Schematic diagram of the pole change of the rotating magnetic field of

[0032] Figure 3 : Figure 1 Schematic diagram of the pole change of the levitation magnetic field of

[0033] Figure 4 : Three-dimensional structure schematic diagram of the magnetic levitation device (with the second yoke);

[0034] Figure 5 : Figure 4 Schematic diagram of the pole change of the rotating magnetic field of

[0035] Figure 6 : Figure 4 Schematic diagram of the pole change of the suspension magnetic field;

[0036] Figure 7 : Cross-sectional view of the submerged stirring device (without the second yoke);

[0037] Figure 8 : Figure 7 Partial enlarged view at position A in

[0038] Figure 9 : Three-dimensional structure schematic diagram of the submerged stirring device;

[0039] Figure 10 : Cross-sectional view of the submerged stirring device (with the second yoke);

[0040] Figure 11 : Figure 10 Partial enlarged view at position B in Detailed implementation manner

[0041] The present invention will be further described below with reference to the accompanying drawings and examples:

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention 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, and therefore should not be construed as limiting the present invention.

[0045] Embodiment 1:

[0046] As Figures 4 to 6 ,Figures 9 to 11 As shown in the figure, a magnetic levitation motor includes: an annular rotor 4, a rotating cylinder 5 and a stator assembly. Two annular rotors 4 are coaxial and arranged in the up and down direction. The two annular rotors 4 have the same number of magnetic poles. The two annular rotors 4 are respectively fixedly connected to the rotating cylinder 5. The rotating cylinder 5 and the two annular rotors 4 are respectively sleeved outside the stator assembly. The stator assembly drives the two annular rotors 4 to rotate through magnetic force, and the magnetic pole arrangement directions of the two annular rotors 4 are the same.

[0047] Further, the annular rotor 4 can be a whole annular magnet or a plurality of magnets arranged annularly.

[0048] Further, the stator assembly includes a first magnetic yoke 1 and a coil group. The coil group is sleeved and fixed outside the first magnetic yoke 1, and the first magnetic yokes 1 are arranged circumferentially and evenly.

[0049] Further, the first magnetic yoke 1 includes an axial arm 11 and a radial arm 12. The upper and lower ends of the axial arm 11 are respectively fixedly connected to the radial arm 12. The radial arm 12 protrudes outward and is located radially inside the annular rotor 4. The coil group is sleeved outside the axial arm 11.

[0050] Each coil group can include one or more coils:

[0051] Optionally, a coil group includes one coil. In this case, one coil provides a rotating magnetic field and a levitation magnetic field for the annular rotor 4. The structure with only one coil is simpler, but has higher requirements for the control system.

[0052] Optionally, the coil group includes a levitation coil 2 and a rotating coil 3. The levitation coil 2 and the rotating coil 3 are respectively sleeved outside the first magnetic yoke 1. The rotating coil 3 is used to drive the annular rotor 4 to rotate, and the levitation coil 2 and the rotating coil 3 jointly drive the annular rotor 4 to levitate. The structure with two coils is complex, but has lower requirements for the control system.

[0053] Further, it further includes a second magnetic yoke 9. The first magnetic yoke 1 passes through the second magnetic yoke 9 and is fixed to the second magnetic yoke 9. The two coil groups corresponding to each first magnetic yoke 1 are respectively located on the upper and lower sides of the second magnetic yoke 9. The second magnetic yoke 9 plays a role of guiding magnetic flux for the corresponding first magnetic yoke 1.

[0054] Further, it further includes a radial sensor and a controller. The radial sensor is used to detect the radial positions of the upper and lower ends of the rotating cylinder 5, and the controller is used to change the current of the levitation coil 2 in the coil group. By making the currents of the upper and lower levitation coils 2 different, different magnetic forces are given to the two annular rotors 4, so that the rotating cylinder 5 deflects.

[0055] Further, the rotating cylinder 5 is made of non-magnetic material, so as to avoid forming an axial magnetic circuit between the two annular rotors 4 in the rotating cylinder 5.

[0056] Further, the inner cavity of the rotating cylinder 5 is vertically through, and the rotating cylinder 5 is a cylinder with openings at both ends, which is convenient for sleeving the rotating cylinder 5 on the outside of the motor housing 6.

[0057] Preferably, the annular rotor 4 is completely located inside the rotating cylinder 5, so as to avoid the annular rotor 4 contacting the outside world, and further avoid the annular rotor 4 polluting the external medium. The rotating cylinder 5 can be made of a material with strong corrosion resistance such as plastic to avoid the external medium corroding the annular rotor 4.

[0058] Taking the stator assembly including 8 first magnetic yokes 1 and 16 coil groups, each first magnetic yoke 1 corresponding to two coil groups, and each annular rotor 4 having 2 magnetic poles as an example, the suspension and rotation principle of this embodiment is described. It should be noted that this embodiment can adopt various combinations of annular rotors 4 and first magnetic yokes 1 with different numbers of magnetic poles.

[0059] As Figure 4 shown, N and S in the figure represent the two magnetic poles of the annular rotor 4. The rotating coils 3 of the upper-layer coil group generate magnetic potential. The two rotating main magnetic paths 13 of the upper layer respectively pass through the two first magnetic yokes 1 of the upper layer, the annular rotor 4 of the upper layer and the second magnetic yoke 9 to complete the closure; the rotating coils 3 of the lower-layer coil group generate magnetic potential at the same time, and the principle is the same as that of the upper layer, and the rotating main magnetic path of the lower layer is not shown in the figure. Among them, Figure 4 the two rotating main magnetic paths 13 of the upper layer are respectively represented by red dotted lines and blue dotted lines, and the arrow direction is the magnetic field direction.

[0060] It should be noted that the independent magnetic paths of the upper and lower layers include the superposition of two components of the rotating main magnetic path 13 generated by the rotating coil 3 and the suspension magnetic path generated by the suspension coil 2. Figure 4 The rotating main magnetic path 13 with arrows in

[0061] is the magnetic path for rotating the annular rotor 4. Figure 5 shown.

[0062] Among them, Figure 5 the upper and lower layers in Figure 5The "upper layer" refers to the magnetic fields of the upper radial arms 12 and the upper annular rotor 4, the "lower layer" refers to the magnetic fields of the lower radial arms 12 and the lower annular rotor 4, the angle below refers to the angle of rotation of the annular rotor 4, the magnetic field within the inner circle is the rotating magnetic field of the stator assembly, and the magnetic field between the circles is the magnetic field of the annular rotor 4.

[0063] For the radial active suspension of the annular rotor 4, it is necessary to energize and control the suspension coils 2 of the stator assembly to generate a 2-pole magnetic field, which is the prior art in the field of magnetic levitation motors. The number of suspended magnetic pole pairs is equal to the number of rotating magnetic pole pairs ± 1 pair. For the offset correction of the annular rotor 4, it is achieved through the combined magnetic field formed by superimposing the suspended magnetic field on the rotating magnetic field.

[0064] The changes in the suspended magnetic field and the position of the annular rotor 4 are as Figure 6 shown. Among them, Figure 6 the upper and lower layers in Figure 6 are both in a top-down perspective. The "upper layer" refers to the magnetic fields of the upper radial arms 12 and the upper annular rotor 4, the "lower layer" refers to the magnetic fields of the lower radial arms 12 and the lower annular rotor 4, the angle below refers to the angle of rotation of the annular rotor 4, the magnetic field within the inner circle is the suspended magnetic field of the stator assembly, and the magnetic field between the two circles is the magnetic field of the corresponding annular rotor 4.

[0065] Among them, except for the 2 degrees of freedom in the radial direction being active suspension and axial rotation, the remaining degrees of freedom are all passive suspension.

[0066] It should be noted that since the polarities of the magnetic poles of the two annular rotors 4 in the axial direction are the same, the polarities of the two radial arms 12 of the same first magnetic yoke 1 are the same.

[0067] In this embodiment, the two coil groups can generate different magnetic forces on the two annular rotors 4 respectively. Since the two annular rotors 4 are coaxially and spaced at both ends of the rotating cylinder 5, compared with the magnetic levitation thin-film motor with only one permanent magnet rotor in the prior art, this structure can better suspend and rotate a relatively long shaft, and has a higher output power under the same volume.

[0068] In most motors, since only one end of the rotating cylinder 5 is connected to the load, the distances from the two annular rotors 4 to the force-receiving part of the rotating cylinder 5 are different. When the radial external force on the rotating cylinder 5 is small, the magnetic resistance between the annular rotor 4 and the stator assembly can suppress the offset of the rotating cylinder 5.

[0069] However, when the radial external force on the rotating cylinder 5 is too large, it is necessary to apply external forces at both the upper and lower ends to suppress it, which requires applying different forces to the two annular rotors 4 at both ends. The difference in the magnetic forces received by the upper and lower annular rotors 4 can be achieved by changing the currents of the upper and lower layers of suspension coils 2.

[0070] Embodiment 2:

[0071] As Figures 1 to 3 , Figures 7 to 9 shown, a magnetic levitation motor includes: an annular rotor 4, a rotating cylinder 5 and a stator assembly. Two annular rotors 4 are coaxial and arranged in the up-and-down direction. The two annular rotors 4 have the same number of magnetic poles. The two annular rotors 4 are respectively fixedly connected to the rotating cylinder 5. The rotating cylinder 5 and the two annular rotors 4 are respectively sleeved outside the stator assembly. The stator assembly drives the two annular rotors 4 to rotate by magnetic force. The magnetic pole arrangement directions of the two annular rotors 4 are opposite.

[0072] Further, the annular rotor 4 can be a whole annular magnet or multiple magnets arranged annularly.

[0073] Further, the stator assembly includes a first magnetic yoke 1 and a coil group. The coil group is fixedly sleeved outside the first magnetic yoke 1. The first magnetic yokes 1 are arranged circumferentially and evenly.

[0074] Further, the first magnetic yoke 1 includes an axial arm 11 and a radial arm 12. The upper and lower ends of the axial arm 11 are respectively fixedly connected to the radial arm 12. The radial arm 12 protrudes outward and is located radially inside the annular rotor 4. The coil group is sleeved outside the axial arm 11.

[0075] Each coil group can include one or more coils:

[0076] Optionally, a coil group includes one coil. In this case, one coil provides a rotating magnetic field and a levitation magnetic field for the annular rotor 4. The structure with only one coil is simpler, but has higher requirements for the control system.

[0077] Optionally, the coil group includes a levitation coil 2 and a rotating coil 3. The levitation coil 2 and the rotating coil 3 are respectively sleeved outside the first magnetic yoke 1. The rotating coil 3 is used to drive the annular rotor 4 to rotate. The levitation coil 2 and the rotating coil 3 jointly drive the annular rotor 4 to levitate. The structure with two coils is complex, but has lower requirements for the control system.

[0078] Further, adjacent first magnetic yokes 1 are not connected by a magnetic conductive material. Adjacent first magnetic yokes 1 refer to two circumferentially adjacent first magnetic yokes 1. This is because if two circumferentially adjacent first magnetic yokes 1 are connected by a magnetic conductive material, the magnetic circuit will be changed.

[0079] Further, the rotating cylinder 5 is made of a non-magnetic conductive material. The rotating cylinder 5 is made of a non-magnetic conductive material, so as to avoid forming an axial magnetic circuit between the two annular rotors 4 in the rotating cylinder 5.

[0080] Furthermore, the inner cavity of the rotating cylinder 5 penetrates up and down, and the rotating cylinder 5 is a cylinder with openings at both ends, which facilitates sleeving the rotating cylinder 5 outside the motor housing 6.

[0081] Preferably, the annular rotor 4 is completely located inside the rotating cylinder 5, so as to avoid the annular rotor 4 contacting the outside world, and further avoid the annular rotor 4 polluting the external medium. The rotating cylinder 5 can be made of materials with strong corrosion resistance such as plastic to avoid the external medium from corroding the annular rotor 4.

[0082] As Figures 1 to 3 shown, taking the stator assembly including 8 first magnetic yokes 1 and 8 coil groups, and each annular rotor 4 having 2 magnetic poles as an example, the suspension and rotation principle of this embodiment is illustrated. It should be noted that this embodiment can adopt various combinations of annular rotors 4 and first magnetic yokes 1 with different numbers of magnetic poles.

[0083] For rotation, similar to a permanent magnet synchronous motor, it is usually necessary for the stator to excite a rotating magnetic field with the same number of poles as the annular rotor 4. Since this embodiment has two annular rotors 4 arranged axially in a straight line, and the coaxial annular rotors 4 are not connected through a magnetic conductive material, the first magnetic yoke 1 is C-shaped and the adjacent two first magnetic yokes 1 are not connected through a magnetic conductive material, so in order to realize the rotating magnetic field, it is necessary to displace the magnetic pole positions of the double-layer annular rotor 4, that is, when the annular rotor 4 has a pole pair number of 1, it shows that the same magnetic poles of the double-layer annular rotor 4 are offset by 180°.

[0084] It should be noted that when the annular rotor 4 has M magnetic pole pairs, the same magnetic poles of the annular rotor 4 are offset by 180° / M.

[0085] Now, let the rotating coil 3 groups of two adjacent first magnetic yokes 1 be energized with the same-direction current. At a certain moment, an N-pole magnetic field is generated. Then, the rotating coil 3 groups of the two first magnetic yokes 1 that are radially symmetric should be energized with the opposite same-direction current, so as to generate an S-pole magnetic field at the same moment. At this time, a pair of magnetic fields required for rotation is formed. By changing the phase of the current, the pair of magnetic fields is made to rotate, thereby driving the annular rotor 4 to rotate. The position changes of the rotating magnetic field and the annular rotor 4 are as Figure 2 shown.

[0086] Among them, Figure 2 both the upper layer and the lower layer in Figure 2 are in a top-down view. The "upper layer" in

[0087] refers to the magnetic field of the upper radial arm 12 and the upper annular rotor 4, and the "lower layer" refers to the magnetic field of the upper radial arm 12 and the upper annular rotor 4. The angle below refers to the rotation angle of the annular rotor 4. The magnetic field inside the circle is the rotating magnetic field of the stator assembly, and the magnetic field between the circles is the magnetic field of the corresponding annular rotor 4. Figure 1As shown in the figure, N and S in the figure represent the two magnetic poles of the annular rotor 4. The rotating coil 3 generates a magnetic potential, and the rotating main magnetic circuit 13 passes through the two first magnetic yokes 1 and the two annular rotors 4 to complete the closure. Among them, Figure 1 the two rotating main magnetic circuits 13 in are respectively represented by red dotted lines and blue dotted lines, and the arrow direction is the magnetic field direction.

[0088] It should be noted that an independent magnetic circuit includes the superposition of two components of the rotating main magnetic circuit 13 generated by the rotating coil 3 and the levitation magnetic circuit generated by the levitation coil 2. Figure 1 The rotating main magnetic circuit 13 with an arrow in is the magnetic circuit for rotating the annular rotor 4.

[0089] For the radial active levitation of the annular rotor 4, it is necessary to generate a 2-pole magnetic field by controlling the energization of the levitation coil 2 of the stator, which is a prior art in the field of magnetic levitation motors. The number of levitation magnetic poles is equal to the number of rotating magnetic poles ±1 pair. For the offset correction of the annular rotor 4, it is achieved by the combined magnetic field of the levitation magnetic field superimposed on the rotating magnetic field.

[0090] The change of the levitation magnetic field of the double-layer annular rotor 4 can be understood by Figure 3 Except for the radial 2 degrees of freedom being active levitation and axial rotation, the remaining degrees of freedom are all passive levitation. Since a specific stator needs the simultaneous participation of the double-layer annular rotor 4 to form the rotating main magnetic circuit 13 during operation, the magnitudes of the corrective forces received by the two annular rotors 4, whether active or passive levitation, will be the same.

[0091] Among them, Figure 3 both the upper layer and the lower layer in are in a top view perspective, Figure 3 the "upper layer" in refers to the magnetic field of the upper radial arm 12 and the upper annular rotor 4, the "lower layer" refers to the magnetic field of the upper radial arm 12 and the upper annular rotor 4, the angle below refers to the rotation angle of the annular rotor 4, the magnetic field inside the circle is the levitation magnetic field of the stator assembly, and the magnetic field between the circles is the magnetic field of the corresponding annular rotor 4.

[0092] Since the two-layer annular rotors 4 are coaxially and spaced at both ends of the rotating cylinder 5, compared with the magnetic levitation thin-film motor with only one annular rotor 4 in the prior art, this structure can better levitate and rotate a relatively long shaft and output greater power.

[0093] Embodiment 3:

[0094] As Figures 1 to 11As shown in the figure, a submersible stirring device using the magnetic levitation motor described in Embodiment 1 or 2 further includes a motor housing 6 made of non-magnetic material. The stator assembly is located inside the motor housing 6 and fixedly connected to the motor housing 6. Blades 52 are formed on the outer side of the rotating cylinder 5. The rotating cylinder 5 is sleeved on the outer side of the motor housing 6. A plurality of motor housings 6 are arranged in a straight line along the same axis. The positions of the motor housings 6 are fixed and detachable. The motor housings 6 can be directly connected or indirectly connected through other connecting parts.

[0095] Further, an annular boss 62 is formed on the outer side of the motor housing 6. The annular boss 62 is located below the rotating cylinder 5 and is used to limit the axial displacement of the rotating cylinder 5. In order to prevent the rotating cylinder 5 from falling due to gravity and leaving the outer side of the motor housing 6, the annular boss 62 is used to stop the rotating cylinder 5, and the rotating cylinder 5 is prevented from continuing to fall after contact.

[0096] Further, a first magnetic assembly 10 and a second magnetic assembly 103 are also included. The first magnetic assembly 10 is fixedly connected to the annular boss 62, and the second magnetic assembly 103 is fixedly connected to the rotating cylinder 5. The first magnetic assembly 10 drives the second magnetic assembly 103 to move axially through magnetic force.

[0097] Optionally, the first magnetic assembly 10 is a magnet, and the second magnetic assembly 103 is a magnet. At this time, the first magnetic assembly 10 and the second magnetic assembly 103 generate a repulsive force, so as to overcome the gravity of the rotating cylinder 5 with magnetic force and make it levitate.

[0098] Optionally, the first magnetic assembly 10 includes a soft magnetic body 101 and an axial coil 102 wound around the outer side of the soft magnetic body 101, and the second magnetic assembly 103 is a magnet. By changing the direction of the current in the axial coil 102, the direction of the magnetic force received by the second magnetic assembly 103 can be changed, so as to drive the rotating cylinder 5 to move axially upward or downward according to the position of the rotating cylinder 5. By changing the magnitude of the current in the axial coil 102, the magnitude of the magnetic force can be changed, so as to accurately control the axial position of the rotating cylinder 5.

[0099] More preferably, an axial sensor and a controller are further included. The axial sensor is used to detect the axial position of the rotating cylinder 5, and the controller is used to change the direction of the current in the axial coil 102. The axial position of the rotating cylinder 5 is detected by the axial sensor, and the detected position information is transmitted to the controller, and the controller judges whether the axial coil 102 needs to be energized and the direction of energization.

[0100] Further, a connecting pipe 7 is also included. The connecting pipe 7 is arranged in a straight line along the same axis as the motor housing 6. Adjacent two pipe parts are fixedly and detachably connected. The pipe parts include the motor housing 6 and the connecting pipe 7.

[0101] Several connecting tubes 7 may be located between the two motor housings 6 , and the axial distance between the two motor housings 6 and the rotating cylinder 5 outside thereof may be changed by the number of connecting tubes 7 .

[0102] The depth of the rotating drum 5 can also be changed by using a motor housing 6 without a rotating drum 5 on the outside, such as two motor housings 6 are directly fixedly connected, the upper motor housing 6 is not provided with a rotating drum 5 on the outside, and the lower motor housing 6 is provided with a rotating drum 5 on the outside, thus reducing the height of the rotating drum 5. In this case, the upper motor housing 6 is equivalent to the connecting tube 7 and does not need to be powered. In this way, the connecting tube 7 is not needed, and the number of required parts is reduced.

[0103] Furthermore, an end cap 63 is included. The connecting pipe 7 and the motor housing 6 are both connected vertically, and the connecting pipe 7 and the motor housing 6 are connected vertically to facilitate the wires to pass upward. The end cap 63 is detachably connected to the lower end of the lowermost pipe. The end cap 63 is used to block the inner cavity of the motor housing 6 or the connecting pipe 7, and plays a sealing role to prevent external fluid from entering the inner cavity of the motor housing 6 or the connecting pipe 7.

[0104] Furthermore, it also includes a top plate 72, the lower end of which is detachably connected to the upper end of the uppermost pipe fitting, and a barrel body 8, which is fixedly and detachably connected to the top plate 72. The top plate 72 is used as a connecting piece to connect the pipe fitting and the barrel body 8 so that the positions of the two are fixed.

[0105] Further, the motor housing 6 is formed with a first boss 61 at one end, and an internal thread is formed on the inner wall of the other end, and an external thread is formed on the outer wall of the first boss 61; the connecting pipe 7 is formed with a second boss 71 at one end, and an internal thread is formed on the inner wall of the other end, and an external thread is formed on the outer wall of the second boss 71; the end cover 63 is formed with an internal thread; the top plate 72 is formed with an external thread; the external thread and the internal thread are matched. The threads of the motor housing 6, the connecting pipe 7, and the end cover 63 are matched, so that the motor housing 6, the connecting pipe 7, and the end cover 63 can be threadedly connected to each other.

[0106] Furthermore, blades 52 are formed on the outer side of the rotating cylinder 5, and the blades 52 are used to stir the fluid.

[0107] Furthermore, the annular rotor 4 is completely located in the rotating cylinder 5 , that is, the rotating cylinder 5 wraps the annular rotor 4 , so as to prevent the annular rotor 4 from contacting with external fluid, preventing the annular rotor 4 from contaminating the fluid, and preventing the fluid from corroding the annular rotor 4 .

[0108] Furthermore, the rotating drum 5 and the motor housing 6 are made of non-magnetic conductive materials. The rotating drum 5, the motor housing 6, the end cover 63 and the connecting pipe 7 can be made of corrosion-resistant plastic.

[0109] Further, the stator assembly includes a first yoke 1 and a coil. The yokes 1 are arranged evenly in a circle, and the coil is sleeved outside the first yoke 1.

[0110] It should be noted that the submersible stirring device may or may not include a barrel 8. When the barrel 8 is not included, the submersible stirring device is inserted into a container filled with a fluid and fixed to the container. When the barrel 8 is included, the fluid is directly added to the barrel 8.

[0111] During installation, according to the requirements of the stirred fluid and the container, the number of motor housings 6 and rotating cylinders 5 is changed, and the distance between the two rotating cylinders 5 is changed by changing the number of connecting pipes 7 between the two motor housings 6 or the number of motor housings 6 without a rotating cylinder 5. By changing the number between the motor housing 6 and the top plate 72, the depth of the rotating cylinder 5 in the container is changed.

[0112] During operation, the stator assembly drives the annular rotor 4 to rotate, and further drives the blade 52 to rotate to stir the fluid. The rotating cylinder 5 floats and does not contact the motor housing 6. The levitation force of the annular rotor 4 can be provided by the stator assembly and / or the first magnetic assembly 10.

[0113] Since each rotating cylinder 5 is driven by the stator assembly in its corresponding motor housing 6, the rotation speed of each rotating cylinder 5 can be adjusted, so that the rotating cylinder 5 generates the required differential speed to improve the stirring effect on a specific fluid.

[0114] The present invention has been described by way of example above, 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 of the present invention.

Claims

1. A magnetic levitation motor, characterized in that: include: An annular rotor (4), a rotating cylinder (5) and a stator assembly, wherein the two annular rotors (4) are coaxial and arranged in the up-and-down direction, the two annular rotors (4) have the same number of magnetic poles, the two annular rotors (4) are respectively fixedly connected to the rotating cylinder (5), the rotating cylinder (5) and the two annular rotors (4) are respectively sleeved on the outside of the stator assembly, the stator assembly drives the two annular rotors (4) to rotate by magnetic force, the annular rotors (4) are radially magnetized, and the stator assembly drives the two annular rotors (4) to suspend; The stator assembly comprises a plurality of first magnetic yokes (1) and coil groups, wherein the coil groups are sleeved and fixed on the outside of the first magnetic yokes (1), and the first magnetic yokes (1) are evenly arranged around the circumference; Each coil group comprises a coil or a suspension coil (2) and a rotating coil (3) for providing a rotating magnetic field and a suspension magnetic field to the annular rotor (4); the suspension coil (2) and the rotating coil (3) are respectively mounted on the outside of the first magnetic yoke (1); the rotating coil (3) is used to drive the annular rotor (4) to rotate; the suspension coil (2) and the rotating coil (3) jointly drive the annular rotor (4) to suspend.

2. A magnetic levitation motor according to claim 1, characterized in that: The first magnetic yoke (1) comprises an axial arm (11) and a radial arm (12); the upper and lower ends of the axial arm (11) are respectively fixedly connected to the radial arm (12); the radial arm (12) protrudes outward and is located radially inside the annular rotor (4); and the coil assembly is sleeved on the outside of the axial arm (11).

3. The magnetic levitation motor according to claim 1, characterized in that: The magnetic poles of the two annular rotors (4) are arranged in opposite directions.

4. The magnetic levitation motor according to claim 1, characterized in that: It also includes a second magnetic yoke (9), the magnetic poles of the two annular rotors (4) are arranged in the same direction, the first magnetic yoke (1) passes through the second magnetic yoke (9) and is fixed to the second magnetic yoke (9), the two coil groups corresponding to each first magnetic yoke (1) are respectively located on the upper and lower sides of the second magnetic yoke (9), and the second magnetic yoke (9) is annular; It also comprises a radial sensor and a controller, wherein the radial sensor is used to detect the radial position of the rotating drum (5), and the controller is used to change the current in the coil group.

5. The magnetic levitation motor according to claim 1, characterized in that: The rotating cylinder (5) is made of a non-magnetic material, and the inner cavity of the rotating cylinder (5) is connected vertically.

6. A submersible stirring device using the magnetic levitation motor according to any one of claims 1 to 5, characterized in that: It also includes a motor housing (6), the motor housing (6) being made of a non-magnetic material, the stator assembly being located inside the motor housing (6) and fixedly connected to the motor housing (6), blades (52) being formed on the outside of the rotating cylinder (5), the rotating cylinder (5) being sleeved on the outside of the motor housing (6), a plurality of motor housings (6) being arranged in a straight line along the same axis, and the motor housings (6) being fixed in position and removable.

7. A submersible stirring device according to claim 6, characterized in that: An annular boss (62) is formed on the outside of the motor housing (6), the annular boss (62) is located below the rotating cylinder (5), and the annular boss (62) is used to limit the axial displacement of the rotating cylinder (5); It also comprises a first magnetic component (10) and a second magnetic component (103), wherein the first magnetic component (10) is fixedly connected to the annular boss (62), and the second magnetic component (103) is fixedly connected to the rotating cylinder (5), and the first magnetic component (10) drives the second magnetic component (103) to move axially through magnetic force.

8. A submersible stirring device according to claim 6, characterized in that: It also includes a connecting pipe (7), wherein the connecting pipe (7) and the motor housing (6) are arranged in a straight line along the same axis, and two adjacent pipes are fixedly and detachably connected, and the pipe includes the motor housing (6) and the connecting pipe (7); It also includes an end cover (63), the connecting pipe (7) and the motor housing (6) are connected vertically, and the end cover (63) is detachably connected to the lower end of the lowermost pipe.

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