Magnetic suspension fan and control method

Abstract

The invention provides a magnetic suspension draught fan and a control method, the magnetic suspension draught fan comprises a volute, centrifugal blades are arranged in the volute, and the two ends of the volute are opened to form air return ports; rotors of the motor assembly are arranged at the two ends of the centrifugal fan blade, and stators are arranged outside openings in the two ends of the volute and matched with the rotors; the plurality of permanent magnets are arranged around the outer surface of the centrifugal fan blade; the electromagnets are arranged on the inner wall of the fan blade cavity of the volute and correspond to the permanent magnets, and the centrifugal fan blades and the rotor are suspended through the magnetic force of the permanent magnets when the electromagnets are powered on. An integrated structure is adopted, the suspension structure in which the electromagnets correspond to the permanent magnets is arranged between the inner wall of the volute and the outer surfaces of the centrifugal fan blades, the centrifugal fan blades and the rotor are suspended in a non-contact mode in the operation process, and friction, abrasion and noise generated by supporting of a bearing or an impeller in a traditional mechanical transmission structure are avoided. Meanwhile, the centrifugal fan blades are supported by magnetic force, higher rotating speed and efficiency can be achieved, and the low-noise and low-vibration state can be kept under long-term operation.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic suspension fans, and in particular to a magnetic suspension fan and a control method thereof. Background Art

[0002] Brushless DC motors have been widely used in industrial and civil fields in recent years due to their high operating efficiency, strong reliability and low maintenance requirements. In the drive system of fan coil units, traditional brushless DC motors have replaced the noisier AC motors to a certain extent due to their lower noise performance, especially in commercial and household air-conditioning systems. However, for some places with higher noise requirements, such as high-end residences, hospitals, libraries, etc., fan coil units driven by traditional brushless DC motors are still difficult to fully meet the requirements, and their operating noise may still exceed the comfort range.

[0003] In order to further reduce noise and improve performance, magnetic levitation motor technology has gradually been introduced into fan coil systems. Magnetic levitation motors rely on magnetic force to support rotating parts, avoiding friction caused by mechanical contact during operation, thereby significantly reducing noise and vibration. At the same time, due to the elimination of mechanical friction, its service life has been greatly extended and maintenance costs have been reduced accordingly. The application of magnetic levitation motors not only effectively solves the applicability shortcomings of traditional DC brushless motors in low-noise scenarios, but also greatly expands the application areas of fan coil units.

[0004] At present, conventional magnetic levitation fan coil units usually adopt a combination design of magnetic levitation motors and centrifugal fans. However, this solution has some technical bottlenecks in practical applications. For example, due to the large size of the magnetic levitation motor, it occupies more return air space, resulting in a limited return air area, which increases wind resistance and causes poor air duct. In addition, the larger motor size may also affect the overall structural design of the fan coil unit, which limits the size and installation flexibility of the equipment. These problems restrict the further popularization and optimization of magnetic levitation motors in fan coil systems. Summary of the invention

[0005] In order to solve the technical problems of large combined size and wind resistance of a magnetic levitation motor and a centrifugal fan in the prior art, the present invention provides a magnetic levitation fan and a control method.

[0006] The technical solution adopted by the present invention is:

[0007] The present invention provides a magnetic suspension fan, comprising:

[0008] A volute, wherein a blade cavity is provided inside for installing centrifugal blades, and an air outlet is provided to communicate with the side of the blade cavity, and the two ends of the volute corresponding to the blade cavity are opened to form a return air outlet;

[0009] A motor assembly, wherein a rotor is arranged at two ends of the centrifugal fan blade, a stator is arranged outside the two end openings of the volute corresponding to the fan blade cavity and surrounds the rotor, and the stator is connected to the volute through a bracket;

[0010] A plurality of permanent magnets are arranged around the outer surface of the centrifugal fan blade;

[0011] A plurality of electromagnets are arranged on the inner wall of the fan blade cavity of the volute corresponding to the permanent magnet, and the centrifugal fan blades and the rotor are suspended by the magnetic force of the permanent magnet when power is supplied.

[0012] Furthermore, a circle of the permanent magnets is arranged around the middle of the centrifugal fan blades, and the permanent magnets are arranged in an arc shape on the outer surface of the centrifugal fan blades.

[0013] The electromagnet includes: a first electromagnet located below the middle of the centrifugal fan blade to provide magnetic repulsion, a second electromagnet located on the air outlet side of the centrifugal fan blade to provide magnetic repulsion, and a third electromagnet located on the inner arc surface of the volute between the first electromagnet and the second electromagnet to provide magnetic attraction.

[0014] Furthermore, a vertical position sensor is provided on the inner wall of the blade cavity of the volute directly above the centrifugal blade, and a horizontal position sensor is provided on the air outlet side of the blade cavity of the volute facing away from the centrifugal blade.

[0015] The bracket comprises a plurality of connecting rods spanning the return air port, one end of the connecting rod is connected to the outer wall surface of the rotor, and the other end is connected to the outer side surfaces of the two ends of the volute.

[0016] The volute includes: a fan mounting portion in a cylindrical shape, and an air duct portion connected to the arc-shaped side surface of the fan mounting portion; the fan blade cavity is arranged inside the mounting portion, the openings are arranged at both ends, and the end of the air duct portion is the air outlet.

[0017] Furthermore, it also includes: a fan fixing plate for installing the volute, the fan fixing plate is a centrally symmetrical structure, and left and right connecting holes are arranged on both sides.

[0018] The present invention also provides a control method for a magnetic levitation fan, using the above-mentioned magnetic levitation fan, comprising the steps of:

[0019] When the magnetic levitation fan is started, the first electromagnet located below the middle of the centrifugal fan blade on the volute and the second electromagnet located on the air outlet side of the centrifugal fan blade are energized to generate a repulsive force on the permanent magnet, and the third electromagnet located on the inner arc surface of the volute between the first electromagnet and the second electromagnet is energized to generate an attractive force.

[0020] After the magnetic levitation fan is started, when the vertical position sensor detects that the centrifugal fan blades deviate from the preset vertical position in the vertical direction, the first electromagnet is controlled to adjust the magnetic force to return the centrifugal fan blades to the preset vertical position; when the horizontal position sensor detects that the centrifugal fan blades deviate from the preset horizontal position in the horizontal direction, the second electromagnet is controlled to adjust the magnetic force to return the centrifugal fan blades to the preset horizontal position.

[0021] Specifically, when the magnetic force of the first electromagnet or the second electromagnet reaches a preset upper limit value or a preset lower limit value during the control process, the magnetic force is adjusted by controlling the third electromagnet to make the centrifugal fan blade centered and balanced.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. Adopting integrated magnetic suspension fan without separate motor, the return air space is increased, the wind resistance is reduced, and the fan energy efficiency is improved.

[0024] 2. The solution of rotary drive on both sides and magnetic suspension in the middle is adopted to dynamically adjust the position of the centrifugal fan blades while ensuring the stable rotation state of the fan, and the adjustment accuracy requirements of the magnetic suspension are relatively low.

[0025] 3. Combined with a single symmetrical fan fixing plate, the modular assembly of the magnetic levitation fan can be realized. The number of magnetic levitation fans can be freely increased according to the size of the structure, greatly enhancing the adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 is a cross-sectional view of a middle position of an embodiment of the present invention;

[0028] Figure 2 It is a three-dimensional structural diagram of a specific embodiment of the present invention;

[0029] Figure 3 is a top view of a hidden portion of the volute in a specific embodiment of the present invention;

[0030] Figure 4 It is a three-dimensional structural diagram of a hidden part of the volute in a specific embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of the force direction of a specific embodiment of the present invention;

[0032] 1. Fan fixing plate;

[0033] 2. Snail case;

[0034] 21. Fan installation part; 22. Air duct part;

[0035] 3. Centrifugal fan blades;

[0036] 4. Motor assembly; 41. Rotor; 42. Stator;

[0037] 5. Bracket;

[0038] 6. Permanent magnet;

[0039] 7. Electromagnet;

[0040] 71. a first electromagnet; 72. a second electromagnet; 73. a third electromagnet;

[0041] 9. Return air vent;

[0042] 10. Air outlet;

[0043] 11. Vertical position sensor; 12. Horizontal position sensor. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0046] Conventional magnetic levitation fan coil units usually use a combination of magnetic levitation motors and centrifugal fans. However, due to the large size of the magnetic levitation motor, it will occupy more return air space, resulting in a limited return air area, which increases wind resistance and causes blocked air ducts. In addition, the larger motor size may also affect the overall structural design of the fan coil unit, which limits the size and installation flexibility of the equipment.

[0047] In this regard, Figure 1 , 2As shown, the present invention proposes a magnetic suspension fan, including: a volute 2, a motor assembly 4, a plurality of permanent magnets 6 and a plurality of electromagnets 7. Among them: a fan blade cavity is provided inside the volute 2 for installing a centrifugal fan blade 3, and the volute 2 forms a return air port 9 at the openings at both ends of the corresponding fan blade cavity to realize the reflux of external air. The motor assembly 4 specifically includes a rotor 41 and a stator 42, and the rotor 41 is arranged at both ends of the centrifugal fan blade 3, that is, a rotor 41 is arranged on each axial side of the centrifugal fan blade 3, so as to form a symmetrical drive structure. The stator 42 of the motor assembly 4 is fixed to the outside of the volute 2 through a bracket 5, and is arranged around the rotor 41 at the corresponding position (the position of the stator 42 can be directly opposite to the outside of the openings at both ends corresponding to the fan blade cavity), and the connection point between the bracket 5 and the volute 2 can be flexibly adjusted according to the installation position of the fan. A plurality of permanent magnets 6 are evenly distributed around the outer surface of the centrifugal fan blade 3, creating basic conditions for the suspension of the centrifugal fan blade 3. A plurality of electromagnets 7 are arranged on the inner wall of the fan blade cavity of the volute 2, corresponding to the permanent magnets 6 on the outer surface of the centrifugal fan blades 3. When the electromagnets 7 are energized, a controllable magnetic force is generated, and a strong magnetic field interaction is formed between the electromagnets 7 and the permanent magnets 6, so that the centrifugal fan blades 3 and the rotor 41 can be suspended without contacting the inner wall of the volute 2. The energization mode of the electromagnets 7 can be adjusted according to the load and speed of the fan, so as to always maintain a stable and quiet operation state under different working conditions.

[0048] By providing a suspension structure corresponding to the electromagnet 7 and the permanent magnet 6 between the inner wall of the volute 2 and the outer surface of the centrifugal fan blade 3, the centrifugal fan blade 3 and the rotor 41 can be suspended without contact during operation, avoiding the friction, wear and noise caused by the bearing or impeller support in the traditional mechanical transmission structure. At the same time, the centrifugal fan blade 3 is supported by magnetic force, which can achieve a higher speed and efficiency, and maintain a low noise and low vibration state during long-term operation.

[0049] As attached Figure 1 , 3 As shown, the permanent magnets 6 are evenly distributed in the middle surrounding area of ​​the outer surface of the centrifugal fan blade 3. Observed from the axial direction of the centrifugal fan blade 3, multiple permanent magnets 6 surround the fan blade in the circumferential direction and are closely attached to the outer circumferential surface of the centrifugal fan blade 3, and are arranged in a ring shape. The ring-shaped permanent magnet 6 structure can make each permanent magnet 6 form a relatively stable magnetic field environment in the radial direction of the fan blade, so that under the action of the electromagnet 7 set at the position corresponding to the inner wall of the volute 2, the fan blade and the rotor 41 are suspended.

[0050] By means of such annular uniform distribution in the middle position, the permanent magnets 6 form a continuous and symmetrical magnetic field band around the centrifugal fan blades 3, thereby improving the balance and stability of the centrifugal fan blades 3 during high-speed rotation. In the structure shown in the accompanying drawings, the relative position layout of the permanent magnets 6 relative to the electromagnets 7 keeps the magnetic force between the two balanced and controllable at all times, thereby achieving a stable, low-noise and high-efficiency suspended operation state.

[0051] In order to realize the magnetic suspension between the centrifugal fan blade 3 and the volute 2, a plurality of electromagnets 7 are distributed around the inner side of the volute 2, as shown in the attached figure. Figure 1 , 5 As shown, the first electromagnet 71 is located directly below the middle of the centrifugal fan blade 3. When observed from the inside of the volute 2, the first electromagnet 71 is in the area directly below the volute 2, arranged close to the arc surface of the inner wall of the volute 2, and forms a pair of stable magnetic support points with the corresponding positions of the permanent magnet 6 in the annular distribution, providing a reliable suspension force field for the lower part of the fan blade, ensuring that the fan blade remains stable in the horizontal direction. The second electromagnet 72 is located on the air outlet side of the centrifugal fan blade 3, located on the right side of the figure, forming a corresponding magnetic field with the permanent magnet 6 on this side, and the second electromagnet 72 mainly provides horizontal support to the left. The third electromagnet 73 is located on the inner arc surface of the volute 2 between the first electromagnet 71 and the second electromagnet 72, located at the lower right in the figure. The third electromagnet 73 is between the electromagnets 7 on the lower and air outlet sides, and is arranged along the circumferential arc surface of the inner wall of the volute 2. The third magnetic force provides attraction to keep the centrifugal fan blade 3 balanced during operation.

[0052] Through the arrangement of the above-mentioned electromagnets 7, the first electromagnet 71, the second electromagnet 72 and the third electromagnet 73 at the middle transition position cooperate with each other, the first electromagnet 71 and the second electromagnet provide upward and leftward support forces respectively, and the third electromagnet 73 provides a pulling force to the lower right, so that the centrifugal fan blades 3 remain balanced during the rotation process.

[0053] In a specific embodiment, Figure 1 As shown, a vertical position sensor 11 is provided on the inner wall of the blade cavity of the volute 2, which is located directly above the centrifugal blade 3, for real-time monitoring of the position change of the centrifugal blade 3 in the vertical direction. When the blade is rotating at high speed or the load changes, if there is a slight vertical deviation, the sensor will immediately capture the position signal and feed it back to the control unit, thereby ensuring that the supporting force of the first electromagnet 71 is adjusted in time as needed to help the centrifugal blade 3 maintain the set vertical balance point. A horizontal position sensor is also provided at the air outlet side of the blade cavity of the volute 2 facing away from the centrifugal blade 3. The sensor continuously monitors the position change of the blade in the horizontal direction. When the blade is disturbed by the airflow or the operating conditions change and there is a tendency of horizontal deviation, this position sensor transmits the signal to the control unit.

[0054] By installing vertical and horizontal position sensors at corresponding positions on the inner wall of the volute 2, in coordination with the layout of the electromagnet 7, it is possible to achieve all-round real-time monitoring and dynamic correction of the operating posture of the centrifugal fan blades 3. As a result, regardless of load changes, air volume fluctuations or speed increases, the fan system can respond quickly and adjust in time, so that the centrifugal fan blades 3 are always in a stable and balanced suspension state.

[0055] In a specific embodiment, as shown in the attached Figure 4 As shown, the bracket 5 includes a plurality of connecting rods spanning the return air port 9. As can be seen in the figure, the connecting rods extend radially outward from the outer wall surface of the rotor 41, with one end firmly connected to the outer wall surface of the rotor 41, and the other end fixed to the outer side surfaces at both ends of the volute 2. The bracket 5 effectively limits and supports the rotor 41 without significantly hindering the return air flow of the return air port 9, ensuring that the overall position of the rotor 41 relative to the volute 2 is accurate and unchanged, thereby providing a reliable mechanical guarantee for the stable suspension and efficient operation of the motor assembly 4 and the centrifugal fan blades 3.

[0056] As attached Figure 2 As shown, the volute 2 as a whole includes two parts: a cylindrical fan mounting portion 21 and an air duct portion 22 connected to the curved side of the fan mounting portion 21. The fan mounting portion 21 constitutes the main space of the fan blade cavity. Both ends of the fan mounting portion 21 are provided with openings, which serve as return air ports and diversion channels, allowing air to flow back unimpeded, flow through the fan blade cavity and finally be discharged from the air duct portion 22. On one side of the fan mounting portion 21, it can be seen in the accompanying drawings that the air duct portion 22 connected to its curved side extends in an arc and forms an air outlet 10 at the end. Through the structural layout of the fan mounting portion 21 and the air duct portion 22 that cooperate with each other, the entire volute 2 realizes a continuous and smooth airflow path from return air, diversion to air outlet, creating a working environment for the high-speed, low-noise and efficient operation of the centrifugal fan blades.

[0057] Specifically, as attached Figure 2 As shown, it also includes a fan fixing plate 1. The fan fixing plate 1 is a centrally symmetrical structure, and left and right connecting holes are arranged on both sides, which can realize modular parallel connection of multiple magnetic suspension fans.

[0058] The present invention also proposes a control method for a magnetic levitation fan, using the above-mentioned magnetic levitation fan, comprising the steps of:

[0059] When the fan starts, the control unit will energize the corresponding electromagnet according to the preset logic. By energizing the first electromagnet located in the lower middle area of ​​the centrifugal fan blade and the second electromagnet located on the air outlet side of the centrifugal fan blade, the electromagnet interacts with the permanent magnets arranged around the outer surface of the centrifugal fan blade to generate a repulsive force. The third electromagnet distributed on the inner arc surface of the volute between the first electromagnet and the second electromagnet is energized to generate an attractive force between it and the permanent magnet. Through this dynamic balance of repulsive and attractive forces, the centrifugal fan blade can obtain stable suspension support and centering positioning during the startup phase.

[0060] At this stage, the current size and power-on sequence of the electromagnet can be appropriately adjusted, and the control unit can ensure that the fan blades avoid sudden swinging or deviation when starting, and smoothly transition to the normal rotation state. This distributed, multi-point electromagnetic control method also facilitates fine adjustments to the magnetic force through sensor feedback information in subsequent operations, so as to achieve continuous low-noise, low-vibration and high-efficiency suspension operation after the fan blades gradually speed up and reach the designed speed.

[0061] Specifically, when the vertical position sensor detects that the centrifugal fan blade deviates from the preset vertical position in the vertical direction, the control unit immediately responds and appropriately adjusts the magnetic force applied by the first electromagnet. By increasing or decreasing the current of the electromagnet, the force between the electromagnet and the permanent magnet changes accordingly, thereby redirecting the centrifugal fan blade back to the set balance point in the vertical direction.

[0062] Specifically, after the magnetic levitation fan enters the stable operation stage, when the horizontal position sensor detects that the centrifugal fan blades have a displacement deviation relative to the preset horizontal position, the control unit appropriately increases or decreases the current passing through the second electromagnet so that the force between the second electromagnet and the permanent magnet is accurately corrected in the horizontal direction, thereby guiding the centrifugal fan blades back to the set horizontal balance point.

[0063] In this way, the centrifugal fan blades can always maintain a stable relative position in the horizontal direction regardless of changes in air volume, speed fluctuations or system load changes. This control can effectively reduce operating noise and vibration, and improve operating energy efficiency and long-term reliability.

[0064] Under normal operating conditions, when the centrifugal fan blades have a slight vertical or horizontal position deviation, the control system first attempts to re-center the fan blades by adjusting the magnetic force of the first electromagnet or the second electromagnet. At this time, if the magnetic force output of the first electromagnet and the second electromagnet is still within the preset adjustable range (i.e., it has not reached the preset upper or lower limit), there is no need to introduce a third electromagnet for intervention, and the system can quickly restore the balance state by relying on the flexible adjustment of the first electromagnet or the second electromagnet.

[0065] When the first electromagnet or the second electromagnet continuously increases or decreases the magnetic force output to correct the position deviation of the fan blade and finally reaches the preset upper limit or lower limit, the equilibrium position of the fan blade still deviates. By applying a corresponding current to the third electromagnet, its magnetic attraction is adjusted to prevent the magnetic forces of the three electromagnets from increasing or decreasing infinitely.

[0066] Through multi-level control strategies, when the fan faces complex working conditions or sudden load changes, the system can flexibly call on the adjustment capabilities of different electromagnets to keep the centrifugal fan blades in a stable magnetic suspension balance in the vertical and horizontal directions. This improves the reliability and steady-state accuracy of the fan during long-term operation.

[0067] The specific adjustment examples are as follows:

[0068] The centrifugal fan blade position detection is completed by the vertical position sensor and the horizontal position sensor installed on the inner wall of the volute. The vertical position sensor is used to detect the vertical position deviation of the centrifugal fan blade, and the horizontal position sensor is used to detect the horizontal position deviation of the centrifugal fan blade. During normal operation, the centrifugal fan blade should be near the set horizontal center distance A and vertical center distance B, and the allowable error range should be controlled within ±1mm.

[0069] In terms of coordinate definition, the centrifugal fan blade is set to be positive if it is upward in the vertical direction and negative if it is downward; it is set to be positive if it is left in the horizontal direction and negative if it is right in the horizontal direction. In the magnetic force adjustment process, the three electromagnets mentioned above are used:

[0070] According to the vertical and horizontal deviations of the centrifugal fan blades, the magnetic force of the electromagnet is adjusted accordingly, as shown below:

[0071] When the centrifugal fan blade is vertically downward (negative):

[0072] If the horizontal direction is also biased to the right (negative), the magnetic force of the third electromagnet (the lower right electromagnet) is kept unchanged, and the magnetic forces of the first electromagnet (the electromagnet directly below) and the second electromagnet (the electromagnet directly to the right) are increased to correct the centrifugal fan blade to the upper left direction.

[0073] If the horizontal direction is biased to the left (positive), keep the magnetic force of the third electromagnet unchanged, increase the magnetic force of the first electromagnet to support upward, and reduce the magnetic force of the second electromagnet, so that the fan blade is adjusted to the right horizontal position while being lifted, and gradually return to the preset balance point.

[0074] When the centrifugal fan blade is vertically upward (positive):

[0075] If the horizontal direction is biased to the right (negative), keep the magnetic force of the third electromagnet unchanged, reduce the magnetic force of the first electromagnet (lower the fan blade slightly downward), and increase the magnetic force of the second electromagnet (correct the fan blade to the left in the horizontal direction).

[0076] If the horizontal direction is biased to the left (positive), the magnetic force of the third electromagnet is kept unchanged, and the magnetic forces of the first electromagnet and the second electromagnet are reduced, so that the centrifugal fan blades are slightly lowered in both the vertical and horizontal directions and return to the balanced position.

[0077] In the above adjustment process, in order to prevent the magnetic force of the first electromagnet and the second electromagnet from increasing or decreasing infinitely, the system sets upper and lower limits on their magnetic force output. When the magnetic force of the first electromagnet or the second electromagnet reaches the preset upper or lower limit during adjustment, and the centrifugal fan blade has not completely returned to the center balance, the third electromagnet is introduced for compensation. At this time, the third electromagnet increases or decreases its magnetic force to help fine-tune the fan blade back to the predetermined center position, forming a dynamic balance relationship between the three electromagnets. The fan blade position can be accurately maintained within the set ±1mm error within a larger range of operating conditions, ensuring the long-term high-efficiency, low-noise, and low-vibration operation of the fan.

[0078] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0079] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0080] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetic levitation fan, characterized in that: include: A volute, wherein a blade cavity is provided inside for installing centrifugal blades, and an air outlet is provided to communicate with the side of the blade cavity, and the two ends of the volute corresponding to the blade cavity are opened to form a return air outlet; A motor assembly, wherein a rotor is arranged at two ends of the centrifugal fan blade, a stator is arranged outside the two end openings of the volute corresponding to the fan blade cavity and surrounds the rotor, and the stator is connected to the volute through a bracket; A plurality of permanent magnets are arranged around the outer surface of the centrifugal fan blade; A plurality of electromagnets are arranged on the inner wall of the fan blade cavity of the volute corresponding to the permanent magnet, and the centrifugal fan blades and the rotor are suspended by the magnetic force of the permanent magnet when power is supplied.

2. The magnetic levitation fan according to claim 1, characterized in that: A circle of permanent magnets is arranged around the middle of the centrifugal fan blades, and the permanent magnets are arranged in an arc shape on the outer surface of the centrifugal fan blades.

3. The magnetic levitation fan according to claim 2, characterized in that: The electromagnet includes: a first electromagnet located below the middle of the centrifugal fan blade to provide magnetic repulsion, a second electromagnet located on the air outlet side of the centrifugal fan blade to provide magnetic repulsion, and a third electromagnet located on the inner arc surface of the volute between the first electromagnet and the second electromagnet to provide magnetic attraction.

4. The magnetic levitation fan according to claim 1, characterized in that: A vertical position sensor is provided on the inner wall of the blade cavity of the volute directly above the centrifugal blade, and a horizontal position sensor is provided on the air outlet side of the blade cavity of the volute facing away from the centrifugal blade.

5. The magnetic levitation fan according to claim 1, characterized in that: The bracket includes a plurality of connecting rods spanning the return air port, one end of the connecting rod is connected to the outer wall surface of the rotor, and the other end is connected to the outer side surfaces at both ends of the volute.

6. The magnetic levitation fan according to claim 1, characterized in that: The volute includes: a fan mounting portion in a cylindrical shape, and an air duct portion connected to the arc-shaped side surface of the fan mounting portion; the fan blade cavity is arranged inside the mounting portion, the openings are arranged at both ends, and the end of the air duct portion is the air outlet.

7. The magnetic levitation fan according to claim 1, characterized in that: Also includes: The fan fixing plate of the volute is installed, and the fan fixing plate is a centrally symmetrical structure, and left and right connecting holes are arranged on both sides.

8. A control method for a magnetic levitation fan, characterized in that: Using the magnetic levitation fan according to any one of claims 1 to 7 comprises the following steps: When the magnetic levitation fan is started, the first electromagnet located below the middle of the centrifugal fan blade on the volute and the second electromagnet located on the air outlet side of the centrifugal fan blade are energized to generate a repulsive force on the permanent magnet, and the third electromagnet located on the inner arc surface of the volute between the first electromagnet and the second electromagnet is energized to generate an attractive force.

9. The control method of the magnetic levitation fan according to claim 8, characterized in that: After the magnetic levitation fan is started, when the vertical position sensor detects that the centrifugal fan blades deviate from the preset vertical position in the vertical direction, the first electromagnet is controlled to adjust the magnetic force to return the centrifugal fan blades to the preset vertical position; when the horizontal position sensor detects that the centrifugal fan blades deviate from the preset horizontal position in the horizontal direction, the second electromagnet is controlled to adjust the magnetic force to return the centrifugal fan blades to the preset horizontal position.

10. The control method of the magnetic levitation fan according to claim 8, characterized in that: When the magnetic force of the first electromagnet or the second electromagnet reaches a preset upper limit or a preset lower limit during the control process, the magnetic force is adjusted by controlling the third electromagnet to make the centrifugal fan blade centered and balanced.

Images