High-rotating-speed dustproof fan

Abstract

The utility model discloses a high rotation speed dustproof fan, including fan frame subassembly, fan blade subassembly, magnet ring subassembly, stator subassembly, PCB, cover plate and bearing subassembly, fan frame subassembly includes middle cylinder and is located the stator sleeve of middle cylinder periphery, the cover plate covers the open end of fan frame subassembly, magnet ring subassembly is located the stator sleeve periphery, stator sleeve is made of permeability magnetic material. The middle cylinder, the stator sleeve and the cover plate define a first closed cavity, the middle cylinder, the cover plate and the fan blade assembly define a second closed cavity, the stator assembly and the PCB are located in the first closed cavity, the bearing assembly is located in the second closed cavity, and the bearing assembly comprises two ball bearings which are installed in the middle cylinder and connected with a motor shaft. The fan can support high-rotating-speed rotation, lubricating oil does not need to be added, power consumption of the fan is reduced, the service life of the fan is prolonged, and meanwhile the stator sleeve in the fan frame assembly can improve the dustproof effect.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a high-speed dust-proof fan. Background Art

[0002] For cost reasons, most of the bearings of fans use oil-impregnated bearings, which are more likely to be contaminated with dust, resulting in increased power consumption of the fan, generation of noise, and shortened service life. Especially for high-speed rotating fans, the noise impact caused by using oil-impregnated bearings is greater.

[0003] In addition, the rotor of the fan is located outside the stator assembly. Since the stator assembly needs to provide a rotating magnetic field for the rotor, a protective structure is usually not provided outside the stator assembly. At present, the dust-proof design of fans mainly focuses on the bearing part, and mostly seals are added, such as seal ring structures, to play a role in dust-proof and oil-proof. This design greatly increases the cost and assembly difficulty of the product, and dust and particles are also easily introduced into the stator assembly. Summary of the Utility Model

[0004] In order to solve the technical problems that the bearings of the existing fans have a greater noise impact during high-speed operation, and the bearing dust-proof structure is complex with poor dust-proof effect, resulting in reduced service life of the fan, the utility model provides a high-speed dust-proof fan to solve the above problems.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a high-speed dust-proof fan, including a fan frame assembly, a blade assembly, a magnetic ring assembly, a stator assembly, a PCB board, a cover plate, and a bearing assembly. The fan frame assembly includes a middle cylinder and a stator sleeve located on the outer periphery of the middle cylinder. The cover plate covers the open end of the fan frame assembly. The magnetic ring assembly is located on the outer periphery of the stator sleeve, and the stator sleeve is made of a magnetic-permeable material.

[0006] The middle cylinder, the stator sleeve, and the cover plate enclose a first sealed cavity. The middle cylinder, the cover plate, and the blade assembly enclose a second sealed cavity. The stator assembly and the PCB board are located in the first sealed cavity, and the bearing assembly is located in the second sealed cavity. The bearing assembly includes two ball bearings installed in the middle cylinder and connected to the motor shaft.

[0007] Further, the middle cylinder is axially penetrated. The interior of the middle cylinder includes a first chamber, a second chamber, and a third chamber arranged in sequence along the axis. The diameter of the second chamber is smaller than the diameters of the first chamber and the third chamber. The two ball bearings are respectively located in the first chamber and the third chamber. A snap ring is installed at the end of the motor shaft and abuts against the end face of the ball bearing.

[0008] Further, the cover plate covers the end of the third chamber. An elastic member is further arranged in the third chamber. The two ends of the elastic member respectively abut between the ball bearing and the step formed by the second chamber and the third chamber.

[0009] Furthermore, the stator sleeve includes a sleeve body, end plates and mounting openings located at both ends of the sleeve body. The end plates are connected to the outer periphery of the middle cylinder, and the mounting openings are mounted with the cover plate.

[0010] Furthermore, the inner diameter of the mounting opening is greater than the inner diameter of the sleeve body. The stator assembly is located inside the sleeve body, and the PCB board is located inside the mounting opening.

[0011] Furthermore, the fan frame assembly further includes an outer frame covering the outer periphery of the fan blade assembly. The outer frame, the stator sleeve and the middle cylinder are integrally injection-molded.

[0012] Furthermore, an annular groove is provided at the open end of the fan frame assembly. The inner diameter of the annular groove is greater than the inner diameter of the stator sleeve. The cover plate includes a first mating surface that is in interference fit with the stator sleeve and a second mating surface that is in fit with the annular groove.

[0013] Furthermore, the cover plate includes a first circular plate and a second circular plate that are integrally formed and coaxially arranged. The diameter of the first circular plate is smaller than the diameter of the second circular plate. The first mating surface is located on the outer peripheral surface of the first circular plate, and the second mating surface is located on the outer peripheral surface of the second circular plate.

[0014] Furthermore, a clamping groove is provided on the outer peripheral surface of the end of the motor shaft, and the snap ring is inserted into the clamping groove.

[0015] Furthermore, taking the first sealed cavity as the potting space, the PCB board, the stator assembly and the middle cylinder are potted and fixed.

[0016] The beneficial effects of the present utility model are as follows:

[0017] (1) The present utility model uses a double ball bearing structure to support the rotation of the motor shaft, ensuring the concentricity of the motor shaft. The ball bearings support high-speed rotation and do not require lubricating oil addition, reducing the power consumption of the fan and increasing the service life of the fan. At the same time, the design of the stator sleeve in the fan frame assembly wraps the stator assembly, the PCB board and the ball bearings in a closed cavity, improving the dust-proof effect without affecting the transmission of the magnetic field by the stator assembly.

[0018] (2) The present utility model is provided with an elastic member at one end of the ball bearing connecting the end of the motor shaft, thereby pressing the ball bearing tightly and reducing the vibration noise caused by the rotation of the fan blade assembly.

[0019] (3) The structure of the present utility model has strong integrity and is convenient for installation. Description of the Drawings

[0020] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1is an exploded view of a specific embodiment of the high-speed dust-proof fan described in the present utility model;

[0022] Figure 2 is an axial sectional view of a specific embodiment of the high-speed dust-proof fan described in the present utility model;

[0023] Figure 3 is a perspective view of one side of the open end of the fan frame assembly in the present utility model;

[0024] Figure 4 is a perspective view of the side of the fan frame assembly opposite to the open end in the present utility model;

[0025] Figure 5 is an axial sectional view of the fan frame assembly in the present utility model;

[0026] Figure 6 is a perspective view of the cover plate in the present utility model.

[0027] In the figure, 1. Fan frame assembly, 101. Middle cylinder, 102. Stator sleeve, 1021. Sleeve body, 1022. End plate, 1023. Installation opening, 103. Outer frame, 2. Blower blade assembly, 3. Magnetic ring assembly, 4. Stator assembly, 5. PCB board, 6. Cover plate, 601. First circular plate, 602. Second circular plate, 7. Bearing assembly, 701. Upper ball bearing, 702. Lower ball bearing, 8. First sealed cavity, 9. Second sealed cavity, 10. First chamber, 11. Second chamber, 12. Third chamber, 13. Snap ring, 14. Open end, 15. Motor shaft, 16. Card slot, 17. Elastic member, 18. Annular groove, 19. First mating surface, 20. Second mating surface. Specific embodiments

[0028] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings below are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0029] Embodiment 1

[0030] As Figures 1 - 5As shown in the figure, a high-speed dust-proof fan includes a fan frame assembly 1, a blade assembly 2, a magnetic ring assembly 3, a stator assembly 4, a PCB board 5, a cover plate 6, and a bearing assembly 7. The fan frame assembly 1 is used to fix the stator assembly 4, the PCB board 5, and the magnetic ring assembly 3. The blade assembly 2 includes multiple blades that provide air volume through rotation. The motor shaft 15 is integrally injection-molded on the blade assembly 2. The bearing assembly 7 is used to rotatably connect the motor shaft 15 to the fan frame assembly 1, reducing friction and noise. The stator assembly 4 is used to provide a rotating magnetic field for the magnetic ring assembly 3. The magnetic ring assembly 3 is fixed to the blade assembly 2 to provide rotational power for the blade assembly 2. The PCB board 5 is connected to the coil lead-out wires of the stator assembly 4 and is used to control the start and stop of the fan.

[0031] The fan frame assembly 1 includes a middle cylinder 101 and a stator sleeve 102 located on the outer periphery of the middle cylinder 101. The stator sleeve 102 can protect the stator assembly 4 and the PCB board 5 and play a dust-proof role. The end of the fan frame assembly 1 has an opening for installing the protected components (the stator assembly 4, the PCB board 5, and the bearing assembly 7) inside it. The cover plate 6 covers the open end 14 of the fan frame assembly 1. The magnetic ring assembly 3 is located on the outer periphery of the stator sleeve 102. The stator sleeve 102 is made of a magnetic-permeable material such as plastic. In this way, the stator sleeve 102 will not affect the stator assembly 4 from cutting the magnetic induction lines generated by the magnetic ring assembly 3, enabling the normal cooperation between the stator assembly 4 and the magnetic ring assembly 3.

[0032] The middle cylinder 101, the stator sleeve 102, and the cover plate 6 enclose a first sealed cavity 8. The middle cylinder 101, the cover plate 6, and the blade assembly 2 enclose a second sealed cavity 9. The stator assembly 4 and the PCB board 5 are located inside the first sealed cavity. The bearing assembly 7 is located inside the second sealed cavity 9. The bearing assembly 7 includes two ball bearings installed inside the middle cylinder 101 and connected to the motor shaft 15. The two ball bearings are respectively arranged near the two ends of the middle cylinder 101. The ball bearings can withstand high-speed rotation. The design of the two ball bearings can prevent the motor from shaking due to the inclination of the motor shaft 15 during high-speed rotation, thereby generating rotational noise. On the one hand, the first sealed cavity plays a role in positioning and limiting the stator assembly 4 and the PCB board 5, and on the other hand, it also plays a dust-proof role. Similarly, the second sealed cavity 9 not only plays a role in positioning and limiting the two ball bearings but also has a dust-proof function.

[0033] Middle cylinder 101:

[0034] Similar to the middle cylinder 101 of the conventional fan frame assembly 1, the middle cylinder 101 of the present invention also penetrates axially. However, due to the different internal bearing assemblies 7, the internal structure of the middle cylinder 101 of the present invention has been improved: such as Figure 2 and Figure 5As shown in the figure, the interior of the middle cylinder 101 includes a first chamber 10, a second chamber 11, and a third chamber 12 arranged in sequence along the axial direction. The diameter of the second chamber 11 is smaller than the diameters of the first chamber 10 and the third chamber 12. Two ball bearings are respectively located in the first chamber 10 and the third chamber 12. A snap ring 13 that abuts against the end face of the ball bearing is installed at the end of the motor shaft 15. The structures and dimensions of the two ball bearings are the same. For the convenience of description, in this embodiment, the ball bearing close to the impeller assembly 2 is the upper ball bearing 701, and the ball bearing close to the cover plate 6 is the lower ball bearing 702. The chamber close to the impeller assembly 2 is the first chamber 10, and the chamber close to the cover plate 6 is the third chamber 12. Then, the upper ball bearing 701 is press-fitted in the first chamber 10, and the lower ball bearing 702 is press-fitted in the third chamber 12. The lower end of the upper ball bearing 701 abuts against the step formed by the first chamber 10 and the second chamber 11, and the upper end is limited by the end of the impeller assembly 2. The lower end of the lower ball bearing 702 abuts against the snap ring 13, and the upper end can abut against the step formed by the third chamber 12 and the second chamber 11. The open end 14 of the fan frame assembly 1 is located at the lower end. Therefore, the cover plate 6 can block the lower end of the middle cylinder 101 to prevent dust or impurities from entering the interior of the middle cylinder 101.

[0035] Stator sleeve 102:

[0036] As Figure 4 and Figure 5 shown in the figure, the stator sleeve 102 includes a sleeve body 1021, end plates 1022 located at both ends of the sleeve body 1021, and mounting openings 1023. The end plate 1022 is connected to the outer periphery of the middle cylinder 101, and the mounting opening 1023 is installed with the cover plate 6. The stator sleeve 102, the middle cylinder 101, and the cover plate 6 enclose a first sealed cavity 8. The lower end of the mounting opening 1023 is the open end 14 of the fan frame assembly 1. The sleeve body 1021, the end plate 1022, and the mounting opening 1023 are preferably integrally injection-molded. Both the mounting opening 1023 and the sleeve body 1021 are cylindrical structures. The inner diameter of the mounting opening 1023 is larger than the inner diameter of the sleeve body 1021. The stator assembly 4 is located in the sleeve body 1021, and the PCB board 5 is located in the mounting opening 1023. The different inner diameter settings of the sleeve body 1021 and the mounting opening 1023 correspond to the stator assembly 4 and the PCB board 5 respectively, realizing the axial positioning of the two components and also minimizing the volume of the stator sleeve 102 as much as possible.

[0037] The installation method of the fan in this embodiment is:

[0038] First, the motor shaft 15 and the fan blade assembly 2 are integrally injection-molded. Then, with the motor shaft 15 as the center, the magnetic ring assembly 3 and the upper ball bearing 701 are successively installed into the fan blade assembly 2. The stator sleeve 102 is fixed in the fan frame assembly 1 in advance. Then, at the open end 14 of the fan frame assembly 1, the stator assembly 4 and the PCB board 5 are installed into the first sealed cavity 8 inside the stator sleeve 102. Next, the lower ball bearing 702 is installed into the third chamber 12 of the middle tube, and then the snap ring is installed into the middle tube. Finally, the installed fan blade assembly 2 is assembled with the fan frame assembly 1 so that the upper ball bearing 701 in the fan blade assembly 2 is located in the first chamber 10 of the fan frame assembly 1.

[0039] The fan frame assembly 1 further includes an outer frame 103 covering the outer periphery of the fan blade assembly 2. The connection between the stator sleeve 102 and the outer frame 103 and the middle cylinder 101 can be welding or gluing. In this embodiment, the outer frame 103, the stator sleeve 102, and the middle cylinder 101 can be integrally injection-molded.

[0040] The installation of the snap ring on the motor shaft 15 can also be welding or gluing. For the convenience of disassembly and assembly and for the accurate positioning of the snap ring, preferably, a groove 16 is provided on the outer peripheral surface of the end of the motor shaft 15, and the snap ring is inserted into the groove 16, similar to a snap-fastener design.

[0041] Embodiment Two

[0042] In Embodiment One, the rotation of the fan blade assembly 2 causes axial oscillation of the motor shaft 15, which collides with the lower ball bearing 702, generating vibration noise. To reduce the vibration noise, the following improvements are made in this embodiment: As Figure 2 shown, an elastic member 17 is further provided in the third chamber 12. The two ends of the elastic member 17 respectively abut between the ball bearing and the step formed by the second chamber 11 and the third chamber 12. The elastic member 17 can be a spring or a rubber pad, etc., with a spring being preferred. The elastic member 17 can prevent the lower ball bearing 702 from colliding with the snap ring 13 frequently, thereby reducing the vibration noise.

[0043] Embodiment Three

[0044] On the basis of the above embodiments, in this embodiment, the mating structure between the cover plate 6 and the fan frame assembly 1 is optimized.

[0045] As Figure 5As shown, an annular groove 18 is provided at the open end 14 of the fan frame assembly 1. The inner diameter of the annular groove 18 is larger than the inner diameter of the stator sleeve 102, specifically referring to the inner diameter of the mounting opening 1023. The cover plate 6 includes a first mating surface 19 that is in interference fit with the stator sleeve 102 and a second mating surface 20 that is in fit with the annular groove 18. The annular groove 18 and the second mating surface 20 can be in clearance fit or interference fit. The stepped design of the first mating surface 19 and the second mating surface 20 can improve the connection strength and prevent dust from directly entering the first sealed cavity 8 after entering the second mating surface 20, that is, improve the sealing effect.

[0046] The cover plate 6 can be formed from a circular plate through post-processing to form two mating surfaces, or it can include a first circular plate 601 and a second circular plate 602 that are integrally formed and coaxially arranged. As Figure 6 shown, the diameter of the first circular plate 601 is smaller than the diameter of the second circular plate 602. The first mating surface 19 is located on the outer peripheral surface of the first circular plate 601, and the second mating surface 20 is located on the outer peripheral surface of the second circular plate 602. After installation, the outer end surface of the second circular plate 602 is flush with the bottom surface of the fan frame assembly 1, making the outer surface of the fan smooth and beautiful.

[0047] Embodiment 4

[0048] In the traditional process, the PCB board 5, the middle cylinder 101, and the stator assembly 4 are all fixed by means of dispensing. In this embodiment, due to the design of the stator sleeve 102, the first sealed cavity 8 can be used as the potting space, and the PCB board 5, the stator assembly 4, and the middle cylinder 101 are potted and fixed. Without the stator sleeve 102, the product potting process cannot be realized. It is necessary to use the first sealed cavity 8 inside the stator sleeve 102 as the space for potting, so that the epoxy resin flows inside the stator sleeve 102 and fills up to the PCB board 5. On the basis of potting, the original dispensing scheme can also be cancelled, simplifying the installation process.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "inner", "outer", "axial", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0050] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] In this specification, the schematic expressions of the terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments.

[0052] Inspired by the above ideal embodiments of the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high-speed dust-proof fan, characterized in that: The invention comprises a fan frame assembly (1), a fan blade assembly (2), a magnetic ring assembly (3), a stator assembly (4), a PCB board (5), a cover plate (6) and a bearing assembly (7), wherein the fan frame assembly (1) comprises a middle cylinder (101) and a stator sleeve (102) located on the outer periphery of the middle cylinder (101), the cover plate (6) covers an open end (14) of the fan frame assembly (1), the magnetic ring assembly (3) is located on the outer periphery of the stator sleeve (102), and the stator sleeve (102) is made of a magnetically permeable material; The middle cylinder (101), the stator sleeve (102) and the cover plate (6) form a first closed cavity (8); the middle cylinder (101), the cover plate (6) and the fan blade assembly (2) form a second closed cavity (9); the stator assembly (4) and the PCB board (5) are located in the first closed cavity (8); the bearing assembly (7) is located in the second closed cavity (9); the bearing assembly (7) comprises two ball bearings installed in the middle cylinder (101) and connected to the motor shaft (15).

2. The high-speed dust-proof fan according to claim 1, wherein: The middle cylinder (101) is axially continuous, and the interior of the middle cylinder (101) comprises a first chamber (10), a second chamber (11), and a third chamber (12) which are sequentially arranged along the axial direction, the diameter of the second chamber (11) being smaller than the diameters of the first chamber (10) and the third chamber (12), two ball bearings are respectively located in the first chamber (10) and the third chamber (12), and a retaining ring (13) abutting against the end surface of the ball bearing is installed at the end of the motor shaft (15).

3. The high-speed dust-proof fan according to claim 2, characterized in that: The cover plate (6) covers the end of the third chamber (12), and an elastic member (17) is also provided in the third chamber (12), with two ends of the elastic member (17) respectively abutting against the ball bearing and the step formed by the second chamber (11) and the third chamber (12).

4. The high-speed dust-proof fan according to claim 1, wherein: The stator sleeve (102) comprises a sleeve body (1021) and end plates (1022) and a mounting opening (1023) located at both ends of the sleeve body (1021); the end plates (1022) are connected to the outer periphery of the middle cylinder (101); and the mounting opening (1023) is mounted on the cover plate (6).

5. The high-speed dust-proof fan according to claim 4, characterized in that: The inner diameter of the installation opening (1023) is greater than the inner diameter of the sleeve body (1021); the stator assembly (4) is located inside the sleeve body (1021); and the PCB board (5) is located inside the installation opening (1023).

6. The high-speed dust-proof fan according to claim 1, characterized in that: The fan frame assembly (1) further comprises an outer frame (103) covering the outer periphery of the fan blade assembly (2); the outer frame (103), the stator sleeve (102) and the middle cylinder (101) are integrally injection-molded.

7. The high-speed dust-proof fan according to claim 6, characterized in that: The open end (14) of the fan frame assembly (1) is provided with an annular groove (18), the inner diameter of the annular groove (18) is larger than the inner diameter of the stator sleeve (102), and the cover plate (6) comprises a first mating surface (19) which is interference-fitted with the stator sleeve (102) and a second mating surface (20) which is mated with the annular groove (18).

8. The high-speed dust-proof blower according to claim 7, wherein: The cover plate (6) includes a first circular plate (601) and a second circular plate (602) which are integrally formed and coaxially arranged. The diameter of the first circular plate (601) is smaller than that of the second circular plate (602). The first mating surface (19) is located on the outer peripheral surface of the first circular plate (601), and the second mating surface (20) is located on the outer peripheral surface of the second circular plate (602).

9. The high-speed dust-proof fan according to claim 2, characterized in that: A clamping groove (16) is provided on the outer peripheral surface of the end of the motor shaft (15), and the snap ring (13) is inserted into the clamping groove (16).

10. The high-speed dust-proof fan according to claim 2, characterized in that: Taking the first sealed cavity (8) as the potting space, the PCB board (5), the stator assembly (4) and the middle cylinder (101) are potted and fixed.

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