Disclosure of Invention
In view of the above, it is desirable to provide a low-noise magnetic levitation fan device.
A magnetic levitation fan apparatus comprising:
A rotor structure;
The fan blades are connected with the rotor structure;
A support member coupled to the rotor structure; and
The stator structure is detachably connected with the supporting piece, and when the magnetic suspension fan device is static, the supporting piece is supported on the stator structure; when the magnetic suspension fan device works, the supporting piece is supported on the stator structure or separated from the stator structure, the fan blades rotate when the magnetic suspension fan device works, and the reaction force generated by air on the fan blades can separate the supporting piece from the stator structure; when the supporting piece is supported on the stator structure, the fan blade has a first rotating speed, and when the supporting piece is separated from the stator structure, the fan blade has a second rotating speed, and the first rotating speed is smaller than the second rotating speed.
In one embodiment, the method further comprises:
a rotating shaft connected to the rotor structure; and
And the limiting structure is provided with a guide hole, and the rotating shaft is slidably connected with the guide hole.
In one embodiment, the limiting structure is provided with a second coil, the rotating shaft is provided with a second magnetic piece, and the second coil can generate magnetic field force after being electrified, and the magnetic field force is at least used for balancing the reaction force of air to the fan blades.
In one embodiment, at least three second coils are disposed, and a plurality of second coils are uniformly arranged on the periphery of the guide hole, so that the rotating shaft is kept separate from the inner wall of the guide hole by adjusting magnetic force generated by each second coil and each second magnetic element.
In one embodiment, the device further comprises a position sensor for sensing the relative position of the rotating shaft and the guide hole, wherein the position sensor obtains a relative position signal representing the relative position of the rotating shaft and the guide hole, and the magnitude of the magnetic field force of each second coil and each second magnetic piece is adjusted through the relative position signal so as to keep the rotating shaft separated from the inner wall of the guide hole.
In one embodiment, the second magnetic member, the rotating shaft, the support member, the rotor structure and the fan blades are connected into a whole, and the center of gravity of the whole is located on the support member.
In one embodiment, the periphery of the fan blade is provided with an annular balancing weight which is concentric with the rotating shaft.
In one embodiment, the rotor structure further comprises a counterweight disposed on at least one of the rotor structure, the rotating shaft, the support, and the fan blade.
In one embodiment, the stator structure is provided with a recess, and the support is provided with a tip capable of being supported by the recess.
In one embodiment, the rotor structure further comprises a bearing by which the support is supported on the rotor structure.
The beneficial effects are that: when the magnetic suspension fan device rotates at a low speed, the supporting piece can be supported on the stator structure, at the moment, relative motion between the supporting piece and the stator structure is generated to generate friction, and at the moment, certain noise can be generated, but the rotation speed of the fan blade is low, so that the generated noise is relatively low. Along with the increase of the rotating speed of the fan blades, the supporting piece is separated from the stator structure, so that friction is not generated between the supporting piece and the stator structure, noise is reduced, and the magnetic suspension fan device still keeps a quiet state when running at a high speed. Meanwhile, the supporting piece is separated from the stator structure, so that friction loss is avoided between the supporting piece and the stator structure, energy loss caused by friction is reduced, and energy is saved.
Detailed Description
In order that the invention may be understood more fully, the invention will be described with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Fig. 1 is a schematic structural diagram of a magnetic levitation fan device according to an embodiment of the present application; fig. 2 is a perspective view of the magnetic levitation fan device of fig. 1.
As shown in fig. 1 and 2, the magnetic levitation fan device includes a rotor structure 100 and a plurality of fan blades 200 connected to the rotor structure 100, for example, four fan blades 200 are provided in fig. 2, and the four fan blades 200 are uniformly distributed on the periphery of the rotor structure 100. The rotor structure 100 is connected with a rotation shaft 300, the axial direction of the rotation shaft 300 can extend along the vertical direction, the rotation shaft 300 extends upwards and is inserted into a limit structure 600, as shown in fig. 1, the limit structure 600 is provided with a guide hole 600a, the guide hole 600a can be a cylindrical hole, the axial direction of the cylindrical hole can extend along the vertical direction, the rotation shaft 300 is inserted into the guide hole 600a and can rotate around the axial direction of the rotation shaft 300 in the guide hole 600a, the limit structure 600 is used for limiting and guiding the rotation shaft 300, and the rotation shaft 300 is limited through the limit structure 600 so that the rotation shaft 300 slides along the axial direction of the rotation shaft 300. Specifically, the guiding means that the rotation shaft 300 slides in the axial direction of the rotation shaft 300 within the guide hole 600a, and the limiting means that the movement of the rotation shaft 300 in the circumferential direction thereof is limited by the guide hole 600a to some extent, and the accuracy of the limitation depends on the fitting accuracy of the guide hole 600a with the rotation shaft 300.
As shown in fig. 1, the rotor structure 100 is further connected with a support member 310, and the support member 310 is detachably connected with a stator structure 400, for example, the support member 310 may abut against the surface of the stator structure 400, as shown in fig. 3, when the rotation shaft 300 slides upward along the axial direction of the rotation shaft 300 with respect to the guide hole 600a of the limit structure 600, the support member 310 may be separated from the stator structure 400, as shown in fig. 1, and when the rotation shaft 300 slides downward along the axial direction of the rotation shaft 300 with respect to the guide hole 600a of the limit structure 600, the support member 310 may be supported on the stator structure 400. In one embodiment, the support 310 is disposed coaxially with the rotational shaft 300, and in some embodiments, the central axis of the support 310 may have an offset from the central axis of the rotational shaft 300 within the tolerance limits described above.
As shown in fig. 1, the support 310 is supported on the stator structure 400 when the maglev fan is stationary. When the magnetic levitation fan is started, the support 310 is gradually separated from the stator structure 400 as the rotation speed of the fan blade 200 is increased. That is, when the magnetic levitation fan is in operation, the support 310 may be supported on the stator structure 400, and the support 310 may be separated from the stator structure 400; specifically, when the support 310 is supported on the stator structure 400, the fan blade 200 has a first rotational speed, and when the support 310 is separated from the stator structure 400, the fan blade 200 has a second rotational speed, and the first rotational speed is smaller than the second rotational speed.
When the magnetic suspension fan apparatus rotates at a low speed, the supporting member 310 may be supported on the stator structure 400, and at this time, friction occurs between the supporting member 310 and the stator structure 400, so that a certain noise can be generated, but the rotation speed of the fan blade 200 is low, so that the generated noise is relatively insignificant. As the rotation speed of the fan blade 200 increases, the supporting member 310 is separated from the stator structure 400, so that friction is not generated between the supporting member 310 and the stator structure 400, noise is reduced, and the magnetic suspension fan device still keeps a quiet state when running at a high speed. Meanwhile, since the support 310 is separated from the stator structure 400, the support 310 and the stator structure 400 have no friction loss, thereby reducing energy loss caused by friction and saving energy.
In one embodiment, since the support 310 can be disengaged from the stator structure 400, the rotation shaft 300 is slidably inserted into the guide hole 600a of the limit structure 600 in order to secure the reliability of the movement. In one embodiment, both the axial direction of the rotation shaft 300 and the axial direction of the guide hole 600a may extend in a vertical direction, and in some embodiments, the axial direction of the rotation shaft 300 and the axial direction of the guide hole 600a may be at an angle to the vertical direction. It should be understood that since the rotation shaft 300 can rotate with respect to the guide hole 600a, the axial direction of the rotation shaft 300 coincides with the axial direction of the guide hole 600a when the guide hole 600a is in high fitting accuracy with the rotation shaft 300, and the axial direction of the rotation shaft 300 is offset from the axial direction of the guide hole 600a when the guide hole 600a is in medium or low fitting accuracy with the rotation shaft 300, that is, the axial direction of the rotation shaft 300 is parallel to or intersects with the axial direction of the guide hole 600 a.
For example, in fig. 1, the axis of rotation 300 is in the vertical direction, or the axis of rotation 300 is in a generally vertical direction, so that the rotor structure 100 and the fan blades 200 can be supported on the stator structure 400 by gravity. When the magnetic levitation fan is started, the fan blade 200 blows downwards, or the fan blade 200 blows downwards approximately, the air generates an upward reaction force to the fan blade 200, and as the rotation speed of the fan blade 200 increases, when the upward reaction force generated by the air to the fan blade 200 is equal to the gravity of the fan blade 200 and the rotor structure 100, the supporting member 310 is in a critical state of separation and non-separation from the stator structure 400, and if the rotation speed of the fan blade 200 is continuously increased, the upward reaction force of the air to the fan blade 200 increases, so that the supporting member 310 is separated from the stator structure 400.
In one embodiment, as shown in fig. 2, the periphery of the fan blade 200 is provided with a balancing weight 210, and the balancing weight 210 is an annular sleeve, and the annular sleeve is concentrically arranged with the rotating shaft 300. The balancing weight 210 in this embodiment not only can make the fan blade 200 stably suspend, but also can increase the angular momentum of the rotation of the fan blade 200 or the rotor structure 100. Specifically, according to the angular momentum formula,
L＝r×p＝r×(mv)＝mr2ω＝Iω，
L represents angular momentum, r represents the distance from the particle to the center of rotation (axis) (the scalar value can be understood as the magnitude of the radius), the direction is from the origin to the vector of the object position (i.e. vector diameter), P represents momentum, v represents linear velocity, ω represents angular velocity (vector), and I represents inertial tensor. The larger the radius r, the larger the angular momentum L, and thus, providing the balancing weight 210 at the periphery of the fan blade 200 can increase the angular momentum L of the rotation of the fan blade 200 or the rotor structure 100. The greater the angular momentum L, the stronger the axiality of the rotation shaft 300, i.e. the more stable the central axis of the rotation shaft 300 is when the fan blade 200 rotates, and the more easily and accurately the distance between the rotor structure 100 and the stator structure 400 is controlled after the fan blade 200 is suspended.
In other embodiments, the weight 210 may also be disposed on the rotor structure 100, and/or on the rotating shaft 300, and/or on the support 310, and/or on the fan blade 200.
In the above embodiments, the support 310 is enabled to be supported on the stator structure 400 by gravity by means of the rotor structure 100 and the fan blades 200. In some embodiments, an auxiliary elastic member may be further provided to replace the gravity of the rotor structure 100 and the fan blade 200 to balance the reaction force of the air to the fan blade 200, where the fan blade 200 is disposed in a more flexible manner, for example, the fan blade 200 may blow laterally or upward. For example, the auxiliary elastic member may be a spring, and the auxiliary elastic member may be elastically supported between the limit structure 600 and the rotor structure 100.
As shown in fig. 1 and 3, the stator structure 400 is provided with a groove 700, and the supporter 310 is provided with a tip 320, and the tip 320 can be supported in the groove 700 to perform a positioning function. In one embodiment, the groove 700 is disposed on a central axis of the stator structure 400. In one embodiment, a bearing 720 is disposed within the recess 700, and the tip 320 is supported within the recess 700 by the bearing 720. In other embodiments, if the stator structure 400 is not provided with the groove 700, the bearing 720 may be directly connected to the outer surface of the stator structure 400, and the tip 320 indirectly abuts against the stator structure 400 through the bearing 720. When the fan blade 200 rotates at a low speed, the bearing 720 rubs to generate less sound, and when the fan blade 200 rotates at a high speed, the tip 320 can be separated from the bearing 720, thus not causing the bearing 720 to generate noise due to the high speed rotation.
In one embodiment, as shown in fig. 1, a first coil 710 is disposed on the stator structure 400, a first magnetic member 510 is disposed on the rotor structure 100, and the first magnetic member 510 may be a permanent magnet, and when the first coil 710 is energized, the rotor structure 100 can rotate relative to the stator structure 400 through cooperation of the first coil 710 and the first magnetic member 510. In one embodiment, the rotor structure 100 is a cavity structure having a downward opening, the stator structure 400 is capable of extending into the cavity structure from the opening, and a first coil 710 is disposed at an end of the stator structure 400 extending into the cavity. The inner wall of the cavity is provided with a first magnetic member 510, and the support member 310 is provided in the middle of the cavity. Since the support 310 can be separated from the stator structure 400, the first magnetic member 510 and the first coil 710 can interact to keep the fan blade 200 stably rotated even after the separation.
As shown in fig. 5, fig. 5 is a schematic cross-sectional view of the stator structure 400 and the rotor structure 100 of fig. 1 where they cooperate. The number of the first magnetic members 510 may be two or more, and in the embodiment shown in fig. 5, two first magnetic members 510 are provided, and two first magnetic members 510 are symmetrically disposed on the inner wall of the rotor structure 100. The number of the first coils 710 may be several, and in the embodiment shown in fig. 5, eight first coils 710 are provided, and the eight first coils 710 are sequentially and uniformly arranged around the ring shape. There is a difference in the magnetic field strength generated by the plurality of first coils 710 due to an error of the manufacturing process. Referring to fig. 1 and 2, after the support member 310 is separated from the stator structure 400 such that the fan blade 200 is suspended, the central axis of the support member 310 may be offset from the central axis of the stator structure 400. When the balancing weight 210 is disposed on the periphery of the fan blade 200, the balancing weight 210 is an annular sleeve, and the annular sleeve is concentrically disposed with the rotation shaft 300, the angular momentum L of the rotation of the fan blade 200 or the rotor structure 100 is large, so that the central axis of the support member 310 is slowly offset from the central axis of the stator structure 400. For example, a position sensor may be disposed to sense the position of the rotation shaft 300 in the guiding hole 600a, and further sense the offset degree of the central axis of the support member 310, and further correspondingly adjust the magnitude of the current passing through each first coil 710, so as to change the magnetic force between each first coil 710 and the first magnetic member 510, and further make the central axis of the support member 310 coincide or substantially coincide with the central axis of the stator structure 400.
In one embodiment, as shown in fig. 1, the limiting structure 600 is provided with a second coil 610, and the rotating shaft 300 is connected with a second magnetic member 520, where the second magnetic member 520 may be a permanent magnet. The second coil 610 and the second magnetic member 520 may be arranged along the axial direction of the rotation shaft 300. When the second coil 610 is energized, a magnetic force can be generated between the second coil 610 and the second magnetic element 520, and when the fan blade 200 is suspended to separate the supporting element 310 from the stator structure 400, the magnetic force generated between the second coil 610 and the second magnetic element 520 is at least used to cooperate with the gravity of the rotor structure 100 and the fan blade 200 to balance the reaction force of the air on the fan blade 200. When the rotation speed of the fan blade 200 increases, the reaction force of the air to the fan blade 200 increases, and the magnetic force generated between the second coil 610 and the second magnetic member 520 can be increased by increasing the current of the second coil 610, so as to balance the reaction force of the air to the fan blade 200.
In one embodiment, the second coil 610 may be one, the second coil 610 is ring-shaped, and a central axis of the ring-shaped second coil 610 and a central axis of the guide hole 600a may be coaxially disposed, that is, when the second coil 610 is one, a winding direction of the second coil 610 is along an outer circumferential direction of the guide hole 600 a. At this time, the magnetic force generated by the second coil 610 and the second magnetic member 520 is along the central axis direction of the second coil 610.
In other embodiments, as shown in fig. 4, fig. 4 is a schematic cross-sectional view of a portion of the second coil 610 and the second magnetic member 520 included in the magnetic levitation fan device of fig. 1, and as shown in fig. 1 and 4, the second coil 610 is provided with at least three, and the second coils 610 are circumferentially arranged at the outer circumference of the guide hole 600a, and at this time, the central axis of each second coil 610 is disposed outside the guide hole 600 a. Further, a plurality of second coils 610 are uniformly arranged at the outer circumference of the guide hole 600 a. As shown in fig. 1, the magnetic force F of one of the second coils 610 and the second magnetic member 520 is F, and the magnetic force F can be decomposed into Fz and Fxy, where the z axis is parallel to the central axis of the guide hole 600a, and the planes of the x axis and the y axis are perpendicular to the z axis. Fz is used to cooperate with the gravity of rotor structure 100 and fan blade 200 to balance the reaction force of air against fan blade 200. Since the second coils 610 are provided with at least three, a plurality of the second coils 610 are circumferentially arranged at the outer circumference of the guide hole 600a, the forces of the second coils 610 in the xy plane can be balanced out, and particularly, the magnitude of the current passing through each of the second coils 610 can be adjusted to be balanced out. For example, a position sensor may be provided to sense the position of the rotation shaft 300 within the guide hole 600a, and thus the rotation shaft 300 is positioned in the middle of the guide hole 600a without contacting the rotation shaft 300 with the inner wall of the guide hole 600a by adjusting the magnitude of the current in the plurality of second coils 610. For example, a position sensor may be provided on the limit structure 600, the position sensor obtaining a relative position signal representing a relative position of the rotation shaft 300 and the guide hole 600a, and adjusting the magnitude of the current of each of the second coils 610 by the relative position signal to adjust the component forces of the plurality of second coils 610 and the second magnetic member 520 in the xy plane, respectively, such that the rotation shaft 300 is not in contact with the inner wall of the guide hole 600 a. In the embodiment shown in fig. 4, four second coils 610 are provided, and the four second coils 610 are uniformly distributed around the outer circumference of the guide hole 600 a.
In one embodiment, as shown in fig. 1, when the supporting member 310 is supported on the stator structure 400, the position where the supporting member 310 contacts with the stator structure 400 is the pivot point where the whole rotation shaft 300 rotates, the second magnetic member 520, the rotation shaft 300, the supporting member 310, the rotor structure 100 and the fan blade 200 are connected as a whole, and the position of the center of gravity of the whole has a certain influence on the difficulty in adjusting the inclination degree of the rotation shaft 300, for example, when the position of the center of gravity of the whole is far away from the pivot point, the component force of the second magnetic member 520 and the second coil 610 in the xy plane needs to be larger to counteract the influence of the component force of gravity when the rotation shaft 300 is inclined, so that a larger current needs to be introduced into the second coil 610, and the sensitivity of adjustment is also reduced due to the influence of inertia.
For this, in one embodiment, as shown in fig. 1, the second magnetic member 520, the rotation shaft 300, the supporting member 310, the rotor structure 100 and the fan blade 200 are integrally connected, and the weight of the second magnetic member 520, the rotation shaft 300, the supporting member 310, the rotor structure 100 and the fan blade 200 is configured such that the center of gravity of the whole is located on the supporting member 310, and when the supporting member 310 is supported on the stator structure 400, the position where the supporting member 310 contacts the stator structure 400 is the pivot point where the whole rotation shaft 300 rotates, and since the center of gravity of the whole is located on the supporting member 310, the center of gravity is closer to the pivot point, thereby reducing the influence of the gravity of the whole on the inclination adjustment of the rotation shaft 300. A less current is applied to the second coil 610 to achieve a sensitive adjustment of the inclination of the rotation shaft 300.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.