Vertical magnetic levitation bearing mechanism and blower with same

Abstract

The utility model provides a vertical magnetic suspension bearing mechanism and have its air blower, vertical magnetic suspension bearing mechanism among it includes first radial magnetic suspension rotor is installed on vertical pivot, first radial magnetic suspension bearing assembly's first radial magnetic suspension bearing is equipped with in the periphery of vertical pivot, first radial magnetic suspension bearing assembly's first radial magnetic suspension stator and first radial sensor all are installed on first radial bearing casing, and the position of first radial magnetic suspension stator and the position of first radial magnetic suspension rotor correspond. According to the utility model, since the whole axle load does not act on first radial magnetic suspension bearing assembly, makes first radial magnetic suspension stator multidirectional current become uniform, multidirectional current unbalance control becomes unidirectional current unbalance control, and control difficulty is reduced greatly. Meanwhile, first radial magnetic suspension stator and first radial sensor are integrated on first radial bearing casing, so that the overall integration is higher.

Description

Technical Field

[0001] This utility model belongs to the field of blower technology, specifically relating to a vertical magnetic levitation bearing mechanism and a blower having the same. Background Technology

[0002] Magnetic levitation bearings are widely used due to their advantages of non-contact operation and low friction. Conventional magnetic levitation blowers often employ a horizontal structure design to meet air volume requirements. However, as air volume increases, the overall size of the equipment and the rotor mass increase significantly, requiring radial magnetic levitation bearings to withstand greater loads. This leads to more complex magnetic field control and increases the difficulty of bearing control. Utility Model Content

[0003] Therefore, this utility model provides a vertical magnetic levitation bearing mechanism, which can solve the technical problem that when the existing magnetic levitation blower adopts a horizontal structure, as the air volume increases, the overall size of the equipment and the rotor mass increase significantly, which makes the radial magnetic levitation bearing bear a greater load, resulting in more complex magnetic field control and increased control difficulty.

[0004] To address the aforementioned problems, this utility model provides a vertical magnetic levitation bearing mechanism, comprising a vertical rotating shaft, a first radial magnetic levitation rotor, and a first radial magnetic levitation bearing assembly. The first radial magnetic levitation rotor is mounted on the vertical rotating shaft. The first radial magnetic levitation bearing assembly includes a first radial bearing housing, a first radial magnetic levitation stator, and a first radial sensor. The first radial bearing housing is sleeved around the periphery of the vertical rotating shaft. The first radial magnetic levitation stator and the first radial sensor are both mounted on the first radial bearing housing, and the position of the first radial magnetic levitation stator corresponds to the position of the first radial magnetic levitation rotor.

[0005] In some embodiments, the first radial bearing housing includes a first end wall and a first annular side wall connected to the first end wall. A first shaft hole is formed on the first end wall, through which the vertical shaft passes. The first annular side wall surrounds the periphery of the vertical shaft. The first radial magnetic levitation stator is mounted on the first annular side wall, and the first radial sensor is mounted on the first end wall.

[0006] In some embodiments, a second radial magnetic levitation rotor is also fitted on the vertical rotating shaft, and a second radial magnetic levitation bearing assembly is also fitted around the periphery of the vertical rotating shaft. The second radial magnetic levitation bearing assembly includes a second radial bearing housing, a second radial magnetic levitation stator, and a second radial sensor. The second radial bearing housing is fitted around the periphery of the vertical rotating shaft, and the second radial magnetic levitation stator and the second radial sensor are both mounted on the second radial bearing housing. The position of the second radial magnetic levitation stator corresponds to the position of the second radial magnetic levitation rotor.

[0007] In some embodiments, the second radial bearing housing includes a second end wall and a second annular side wall connected to the second end wall. A second shaft hole is formed on the second end wall, through which the vertical shaft passes. The second annular side wall surrounds the periphery of the vertical shaft. The second radial magnetic levitation stator is mounted on the second annular side wall, and the second radial sensor is mounted on the second end wall.

[0008] In some embodiments, a thrust disk is also fitted on the vertical rotating shaft, and a first axial magnetic levitation stator and a second axial magnetic levitation stator are also fitted around the periphery of the vertical rotating shaft. The first axial magnetic levitation stator and the second axial magnetic levitation stator are located on the upper and lower sides of the thrust disk, respectively.

[0009] In some embodiments, an axial sensor is mounted on one of the first axial magnetic levitation stator and the second axial magnetic levitation stator.

[0010] In some embodiments, the cross-sectional area of ​​the first axial magnetic levitation stator is larger than the cross-sectional area of ​​the second axial magnetic levitation stator, and the axial sensor is mounted on the first axial magnetic levitation stator.

[0011] This utility model also provides a blower, including the aforementioned vertical magnetic levitation bearing mechanism.

[0012] In some embodiments, a thrust plate is also fitted on the vertical rotating shaft, and a first axial magnetic levitation stator and a second axial magnetic levitation stator are also fitted around the periphery of the vertical rotating shaft. The first axial magnetic levitation stator and the second axial magnetic levitation stator are respectively located on the upper and lower sides of the thrust plate. The thrust plate, the first axial magnetic levitation stator and the second axial magnetic levitation stator are all installed in the cylinder. The cylinder is provided with ventilation holes, and the positions of the ventilation holes correspond to the positions of the thrust plate.

[0013] In some embodiments, both the top and bottom ends of the cylinder are open, and a cover plate is assembled at the bottom end of the cylinder to close the bottom opening of the cylinder.

[0014] The vertical magnetic levitation bearing mechanism and the blower incorporating it provided by this utility model have the following beneficial effects: When the vertical magnetic levitation bearing mechanism of this application is applied to a blower, because the assembly method of the entire magnetic levitation bearing mechanism is adjusted to vertical, the load of the entire shaft does not act on the first radial magnetic levitation bearing assembly. This makes the multi-directional current of the first radial magnetic levitation stator more uniform, and the multi-directional current imbalance control becomes unidirectional current imbalance control, significantly reducing the control difficulty of the first radial magnetic levitation bearing assembly. Furthermore, with the reduction of radial load, the coil current of the first radial magnetic levitation stator also decreases, resulting in less heat generation. Simultaneously, both the first radial magnetic levitation stator and the first radial sensor are integrated on the first radial magnetic levitation bearing, resulting in higher overall integration and a more compact structure, which is beneficial for shortening the axial dimension of the vertical shaft. Attached Figure Description

[0015] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of the blower according to an embodiment of the present utility model.

[0017] The reference numerals in the attached figures are as follows: 1. Vertical rotating shaft; 2. First radial magnetic levitation rotor; 3. First radial bearing housing; 31. First end wall; 32. First annular side wall; 4. First radial magnetic levitation stator; 5. First radial sensor; 6. Second radial magnetic levitation rotor; 7. Second radial bearing housing; 71. Second end wall; 72. Second annular side wall; 8. Second radial magnetic levitation stator; 9. Second radial sensor; 10. Thrust plate; 11. First axial magnetic levitation stator; 12. Second axial magnetic levitation stator; 13. Axial sensor; 14. Cylinder; 15. Ventilation hole; 16. Cover plate; 17. Impeller; 18. Motor rotor; 19. Motor stator. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0020] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0021] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0022] See Figure 1As shown, according to an embodiment of the present invention, a vertical magnetic levitation bearing mechanism is provided, including a vertical rotating shaft 1, a first radial magnetic levitation rotor 2, and a first radial magnetic levitation bearing assembly. The first radial magnetic levitation rotor 2 is mounted on the vertical rotating shaft 1. The first radial magnetic levitation bearing assembly includes a first radial bearing housing 3, a first radial magnetic levitation stator 4, and a first radial sensor 5. The first radial bearing housing 3 is fitted around the periphery of the vertical rotating shaft 1. The first radial magnetic levitation stator 4 and the first radial sensor 5 are both mounted on the first radial bearing housing 3, and the position of the first radial magnetic levitation stator 4 corresponds to the position of the first radial magnetic levitation rotor 2.

[0023] In this technical solution, when the vertical magnetic levitation bearing mechanism of this application is applied to a blower, because the assembly method of the entire magnetic levitation bearing mechanism is adjusted to vertical, the load of the entire shaft does not act on the first radial magnetic levitation bearing assembly. This makes the multi-directional current of the first radial magnetic levitation stator 4 more uniform, and the multi-directional current imbalance control becomes unidirectional current imbalance control, significantly reducing the control difficulty of the first radial magnetic levitation bearing assembly. Furthermore, with the reduction of radial load, the coil current of the first radial magnetic levitation stator 4 also decreases, reducing heat generation. Simultaneously, the first radial magnetic levitation stator 4 and the first radial sensor 5 are both integrated on the first radial bearing housing 3, resulting in higher overall integration and a more compact structure, which is beneficial for shortening the axial dimension of the vertical shaft 1. The first radial magnetic levitation stator 4 and the first radial magnetic levitation rotor 2 cooperate to control the radial position of the vertical shaft 1.

[0024] See Figure 1 As shown, the first radial bearing housing 3 includes a first end wall 31 and a first annular side wall 32 connected to the first end wall 31. A first shaft hole is formed on the first end wall 31, through which the vertical rotating shaft 1 passes. The first annular side wall 32 surrounds the periphery of the vertical rotating shaft 1. The first radial magnetic levitation stator 4 is mounted on the first annular side wall 32, and the first radial sensor 5 is mounted on the first end wall 31.

[0025] In this embodiment, the first radial bearing housing 3 is designed to consist of a first end wall 31 and a first annular side wall 32. The first radial magnetic levitation stator 4 is mounted on the first annular side wall 32, and the first radial sensor 5 is mounted on the first end wall 31. This arrangement ensures that the first radial magnetic levitation stator 4 and the first radial sensor 5 are dispersed on the first radial bearing housing 3 at a certain distance, preventing mutual interference and guaranteeing normal operation of both. Specifically, the first radial magnetic levitation stator 4 is mounted in the first annular side wall 32 with an interference fit. A first slot is formed on the wall of the first shaft hole, and the first radial sensor 5 is embedded in this slot. This allows the first radial sensor 5 to be as close as possible to the vertical shaft 1, facilitating real-time monitoring of the radial position changes of the vertical shaft 1 without being affected by changes in shaft dynamics.

[0026] See Figure 1 As shown, a second radial magnetic levitation rotor 6 is also mounted on the vertical shaft 1. A second radial magnetic levitation bearing assembly is also mounted on the periphery of the vertical shaft 1. The second radial magnetic levitation bearing assembly includes a second radial bearing housing 7, a second radial magnetic levitation stator 8, and a second radial sensor 9. The second radial bearing housing 7 is mounted on the periphery of the vertical shaft 1. The second radial magnetic levitation stator 8 and the second radial sensor 9 are both mounted on the second radial bearing housing 7, and the position of the second radial magnetic levitation stator 8 corresponds to the position of the second radial magnetic levitation rotor 6.

[0027] In this technical solution, because the assembly method of the entire magnetic levitation bearing mechanism is adjusted to vertical, the load on the entire shaft does not act on the second radial magnetic levitation bearing assembly. This makes the multi-directional current of the second radial magnetic levitation stator 8 more uniform, and the multi-directional current imbalance control becomes unidirectional current imbalance control, significantly reducing the control difficulty of the second radial magnetic levitation bearing assembly. Furthermore, with the reduction in radial load, the coil current of the second radial magnetic levitation stator 8 also decreases, resulting in less heat generation. Simultaneously, both the second radial magnetic levitation stator 8 and the second radial sensor 9 are integrated onto the second radial bearing housing 7, resulting in higher overall integration and a more compact structure, which helps to shorten the axial dimension of the vertical shaft 1. The second radial magnetic levitation stator 8 and the second radial magnetic levitation rotor 6 cooperate to control the radial position of the vertical shaft 1.

[0028] See Figure 1 As shown, the second radial bearing housing 7 includes a second end wall 71 and a second annular side wall 72 connected to the second end wall 71. A second shaft hole is formed on the second end wall 71, through which the vertical shaft 1 passes. The second annular side wall 72 surrounds the periphery of the vertical shaft 1. The second radial magnetic levitation stator 8 is mounted on the second annular side wall 72, and the second radial sensor 9 is mounted on the second end wall 71.

[0029] In this embodiment, the second radial bearing housing 7 is designed to consist of a second end wall 71 and a second annular side wall 72. The second radial magnetic levitation stator 8 is mounted on the second annular side wall 72, and the second radial sensor 9 is mounted on the second end wall 71. This arrangement ensures that the second radial magnetic levitation stator 8 and the second radial sensor 9 are dispersed on the second radial bearing housing 7 at a certain distance, preventing mutual interference and guaranteeing normal operation of both. Specifically, the second radial magnetic levitation stator 8 is mounted in the second annular side wall 72 with an interference fit. A second slot is provided on the wall of the second shaft hole, and the second radial sensor 9 is embedded in this slot. This allows the second radial sensor 9 to be as close as possible to the vertical shaft 1, facilitating real-time monitoring of the radial position changes of the vertical shaft 1 without being affected by changes in shaft dynamics.

[0030] See Figure 1 As shown, a thrust disk 10 is also mounted on the vertical rotating shaft 1, and a first axial magnetic levitation stator 11 and a second axial magnetic levitation stator 12 are also mounted on the periphery of the vertical rotating shaft 1. The first axial magnetic levitation stator 11 and the second axial magnetic levitation stator 12 are located on the upper and lower sides of the thrust disk 10, respectively.

[0031] In this technical solution, the first radial magnetic levitation bearing assembly is located above the second radial magnetic levitation bearing assembly, while the first axial magnetic levitation stator 11, the second axial magnetic levitation stator 12, and the thrust disk 10 are all located between the first and second radial magnetic levitation bearing assemblies, and are distributed sequentially from top to bottom. The first axial magnetic levitation stator 11, the second axial magnetic levitation stator 12, and the thrust disk 10 cooperate to control the axial position of the vertical shaft 1. The aforementioned first radial magnetic levitation stator 4 and second radial magnetic levitation stator 8 both transfer the current imbalance to the first axial magnetic levitation stator 11 and the second axial magnetic levitation stator 12, thus transforming the multi-directional current imbalance control of the two radial stators into unidirectional current imbalance control, thereby significantly reducing the control difficulty of the first and second radial magnetic levitation bearing assemblies.

[0032] It should be noted that the gravity of the vertical rotating shaft 1 and other components mounted on it can balance the pulling force generated by a portion of the current in the first axial magnetic levitation stator 11, thereby directly reducing the number of coil turns or the magnetic pole area of ​​the second axial magnetic levitation stator 12, so that the force provided by the second axial magnetic levitation stator 12 is reduced when the current is the same, thereby reducing the loss of the second axial magnetic levitation stator 12.

[0033] See Figure 1As shown, an axial sensor 13 is mounted on one of the first axial magnetic levitation stators 11 and the second axial magnetic levitation stator 12. This is equivalent to using the already necessary axial magnetic levitation stator to install the axial sensor 13, making the entire axial control section more compact and reducing the axial dimension of the vertical shaft 1. Moreover, with the axial sensor 13 mounted on the axial magnetic levitation stator, it can directly detect the axial changes of the thrust disk 10, avoiding structural vibration, change delay, or errors caused by other indirect detection methods that are mechanically connected to the thrust disk 10. This reduces system complexity, improves environmental adaptability, ensures accurate reflection of the thrust disk status, and achieves "zero-distance" detection.

[0034] See Figure 1 As shown, the cross-sectional area of ​​the first axial magnetic levitation stator 11 is larger than that of the second axial magnetic levitation stator 12, and the axial sensor 13 is mounted on the first axial magnetic levitation stator 11.

[0035] In this embodiment, because the first axial magnetic levitation stator 11 has a larger cross-sectional area, mounting the axial sensor 13 on the first axial magnetic levitation stator 11 allows for a greater distance between the axial sensor 13 and the coil of the first axial magnetic levitation stator 11. This results in weaker mutual interference between the axial sensor 13 and the coil, ensuring that both operate normally. Preferably, the axial sensor 13 is mounted on the side of the first axial magnetic levitation stator 11 facing the vertical shaft 1.

[0036] This utility model also provides a blower, including the aforementioned vertical magnetic levitation bearing mechanism.

[0037] See Figure 1 As shown, the blower also includes a cylinder 14, a thrust plate 10, a first axial magnetic levitation stator 11 and a second axial magnetic levitation stator 12, all of which are installed inside the cylinder 14. The cylinder 14 is provided with ventilation holes 15, the positions of which correspond to the positions of the thrust plate 10.

[0038] In this technical solution, because the thrust plate 10 is large in size and made of a single iron core, its wind wear loss and iron loss are relatively large due to its structure. Furthermore, the overall load is concentrated on the two axial magnetic levitation stators, which generate a significant amount of heat. Therefore, ventilation holes 15 are opened at the positions of the thrust plate 10 and the cylinder 14 to improve the cooling effect of the thrust plate 10 and the two axial magnetic levitation stators, thereby improving system stability. The two radial magnetic levitation bearing assemblies have small loads, resulting in low heat generation in the two radial magnetic levitation stators. Therefore, heat can be dissipated to the outside of the cylinder 14 solely through heat conduction. Preferably, the cylinder 14 has multiple ventilation holes 15, which are spaced apart circumferentially along the cylinder 14. Increasing the number of ventilation holes 15 enhances the cooling effect on the thrust plate 10 and the two axial magnetic levitation stators.

[0039] See Figure 1 As shown, the top and bottom of the cylinder 14 are both open. The first radial bearing housing 3 is installed at the top of the cylinder 14, and the second radial bearing housing 7 is installed at the bottom of the cylinder 14. The blower also includes a cover plate 16, an impeller 17, a motor rotor 18, and a motor stator 19. The motor stator 19 is installed inside the cylinder 14 and is located between the second axial magnetic levitation stator 12 and the second radial bearing housing 7. The impeller 17 and the motor rotor 18 are both mounted on the vertical shaft 1. The position of the motor rotor 18 corresponds to the position of the motor stator 19. The impeller 17 is located outside the cylinder 14 and above the first radial bearing housing 3. The cover plate 16 is assembled at the bottom of the cylinder 14 and closes its bottom opening to form a protective layer. It should be noted that the general assembly process of the blower is as follows: the second radial magnetic levitation bearing assembly is first assembled into the cylinder 14, and then the whole assembly is locked by using the matching position of the blower and the unit. Then the second axial magnetic levitation stator 12 is installed, followed by the shaft, and finally the first radial magnetic levitation bearing assembly and impeller 17 are installed.

[0040] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0041] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above are only preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A vertical magnetic levitation bearing mechanism, characterized in that, The device includes a vertical shaft (1), a first radial magnetic levitation rotor (2), and a first radial magnetic levitation bearing assembly. The first radial magnetic levitation rotor (2) is mounted on the vertical shaft (1). The first radial magnetic levitation bearing assembly includes a first radial bearing housing (3), a first radial magnetic levitation stator (4), and a first radial sensor (5). The first radial bearing housing (3) is mounted on the periphery of the vertical shaft (1). The first radial magnetic levitation stator (4) and the first radial sensor (5) are both mounted on the first radial bearing housing (3), and the position of the first radial magnetic levitation stator (4) corresponds to the position of the first radial magnetic levitation rotor (2).

2. The vertical magnetic levitation bearing mechanism according to claim 1, characterized in that, The first radial bearing housing (3) includes a first end wall (31) and a first annular side wall (32) connected to the first end wall (31). A first shaft hole is formed on the first end wall (31). The vertical shaft (1) passes through the first shaft hole. The first annular side wall (32) surrounds the periphery of the vertical shaft (1). The first radial magnetic levitation stator (4) is mounted on the first annular side wall (32). The first radial sensor (5) is mounted on the first end wall (31).

3. The vertical magnetic levitation bearing mechanism according to claim 1, characterized in that, The vertical shaft (1) is also fitted with a second radial magnetic levitation rotor (6). The vertical shaft (1) is also fitted with a second radial magnetic levitation bearing assembly. The second radial magnetic levitation bearing assembly includes a second radial bearing housing (7), a second radial magnetic levitation stator (8), and a second radial sensor (9). The second radial bearing housing (7) is fitted around the vertical shaft (1). The second radial magnetic levitation stator (8) and the second radial sensor (9) are both mounted on the second radial bearing housing (7). The position of the second radial magnetic levitation stator (8) corresponds to the position of the second radial magnetic levitation rotor (6).

4. The vertical magnetic levitation bearing mechanism according to claim 3, characterized in that, The second radial bearing housing (7) includes a second end wall (71) and a second annular side wall (72) connected to the second end wall (71). A second shaft hole is formed on the second end wall (71), through which the vertical shaft (1) passes. The second annular side wall (72) surrounds the periphery of the vertical shaft (1). The second radial magnetic levitation stator (8) is mounted on the second annular side wall (72), and the second radial sensor (9) is mounted on the second end wall (71).

5. The vertical magnetic levitation bearing mechanism according to any one of claims 1 to 4, characterized in that, The vertical rotating shaft (1) is also fitted with a thrust plate (10), and the periphery of the vertical rotating shaft (1) is also fitted with a first axial magnetic levitation stator (11) and a second axial magnetic levitation stator (12). The first axial magnetic levitation stator (11) and the second axial magnetic levitation stator (12) are located on the upper and lower sides of the thrust plate (10), respectively.

6. The vertical magnetic levitation bearing mechanism according to claim 5, characterized in that, An axial sensor (13) is installed on one of the first axial magnetic levitation stators (11) and the second axial magnetic levitation stators (12).

7. The vertical magnetic levitation bearing mechanism according to claim 6, characterized in that, The cross-sectional area of ​​the first axial magnetic levitation stator (11) is larger than that of the second axial magnetic levitation stator (12), and the axial sensor (13) is mounted on the first axial magnetic levitation stator (11).

8. A blower, characterized in that it includes the vertical magnetic levitation bearing mechanism as described in any one of claims 1 to 7.

9. The blower according to claim 8, characterized in that, The vertical rotating shaft (1) is also fitted with a thrust plate (10). The outer periphery of the vertical rotating shaft (1) is also fitted with a first axial magnetic levitation stator (11) and a second axial magnetic levitation stator (12). The first axial magnetic levitation stator (11) and the second axial magnetic levitation stator (12) are located on the upper and lower sides of the thrust plate (10), respectively. The thrust plate (10), the first axial magnetic levitation stator (11) and the second axial magnetic levitation stator (12) are all installed inside the cylinder (14). The cylinder (14) is constructed with ventilation holes (15). The position of the ventilation holes (15) corresponds to the position of the thrust plate (10).

10. The blower according to claim 9, characterized in that, The top and bottom of the cylinder (14) are both open. A cover plate (16) is assembled at the bottom of the cylinder (14) to close the bottom opening of the cylinder (14).

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