Brushless sweeper fan

Abstract

According to the brushless sweeper fan provided by the utility model, the riveting edge is arranged on the outer side of the middle section of the bearing seat of the brushless sweeper fan, and the PCBA board is riveted and fixed on the outer side of the middle section of the bearing seat by extruding the operation inclined surface and expanding the riveting edge, so that screws are omitted, or steel plates and insulation paper are omitted compared with galvanized steel plate riveting, and the assembly operation is more convenient; the labor cost and the material cost are reduced; meanwhile, a copper surface is arranged on the PCBA board mounting port to enable the PCBA board to be in contact and electric connection with the bearing seat after the PCBA board is riveted and fixed, so that the motor body and the PCBA board are in a conducting state, the EMC of the motor is reduced, and the phenomenon that the PCBA board is directly punctured by static electricity to cause damage to the motor is prevented.

Description

Technical Field

[0001] This utility model relates to the field of sweeping machine technology, and in particular to a brushless sweeping machine fan. Background Technology

[0002] Currently, most sweeper fans on the market use screws or galvanized steel plates to fix the PCBA (PCBA) in their blowers. Using galvanized steel plates requires adding insulating paper between the PCBAs, making the manufacturing process relatively complex and resulting in high labor and material costs. Therefore, further improvements to the structure of brushless sweeper blowers are needed. Utility Model Content

[0003] In view of this, the present invention provides a brushless sweeper fan, which addresses the problems of the prior art by designing a riveting edge to directly rivet and fix the PCBA board, thus solving the existing technical problems.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A brushless sweeper fan, comprising:

[0006] The volute has an air inlet at its lower center and a mounting hole at its upper center.

[0007] The bearing housing has its lower section fixedly installed inside the volute mounting hole, and its upper end located outside the volute mounting hole. An inner stator assembly is provided on the outer side of the upper end. An outer rotor assembly is rotatably installed in the hollow interior of the bearing housing. The upper part of the outer rotor assembly covers the outer side of the inner stator assembly. A riveting edge is provided on the outer side of the middle section of the bearing housing, and an operating inclined surface is provided on the inner side of the riveting edge.

[0008] The PCBA board is fitted onto the outside of the riveting edge through the mounting port located in the middle.

[0009] The fan blade is located inside the volute and is fixedly mounted at the bottom of the outer rotor assembly;

[0010] The PCBA board is fixed to the outer side of the middle section of the bearing seat by riveting along the inclined surface of the pressing operation.

[0011] Furthermore, the PCBA board mounting port is provided with a copper surface that is electrically connected to the PCBA board, and the copper surface is electrically connected to the bearing seat after the PCBA board is riveted and fixed.

[0012] Furthermore, the outer rotor assembly includes a rotating shaft, an upper bearing, an upper retaining ring, a spring, a lower bearing, a lower retaining ring, a rotor housing, and a magnetic ring. The upper bearing is mounted on the rotating shaft via the upper retaining ring, and the lower bearing is mounted on the rotating shaft via the lower retaining ring. The spring is sleeved on the rotating shaft and its two ends abut against the upper and lower bearings respectively. The rotating shaft is rotatably mounted in the hollow cavity inside the bearing housing via the upper and lower bearings. The rotor housing is fixedly mounted on the top of the rotating shaft, the magnetic ring is fixedly mounted inside the rotor housing and covers the outside of the inner stator assembly, and the fan blades are fixedly mounted on the bottom of the rotating shaft.

[0013] Furthermore, a balance block is provided on the outer edge of the upper end of the rotor housing.

[0014] Furthermore, the inner stator assembly includes a stator core, on which a stator coil is wound, the stator coil being electrically connected to the PCBA board, and the stator core being fixedly mounted on the outer side of the top of the bearing housing.

[0015] Furthermore, a protective cover is provided on the outside of the outer rotor assembly, which is located on the upper side of the volute and covers the upper end of the outer rotor assembly.

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

[0017] This invention features a riveting edge on the outer side of the middle section of the fan bearing housing in a brushless sweeper. The PCBA board is riveted and fixed to the outer side of the middle section of the bearing housing by operating the outward expansion of the riveting edge through a pressing operation, eliminating the need for screws. Alternatively, compared to riveting with galvanized steel plates, it eliminates the need for steel plates and insulating paper, making assembly more convenient and reducing labor and material costs. At the same time, copper surfaces are arranged on the PCBA board mounting port to make contact electrical connection between the PCBA board and the bearing housing after riveting and fixing, so that the motor body and the PCBA board are in a conductive state, reducing motor EMC and preventing electrostatic discharge from directly damaging the PCBA board and causing motor damage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the disassembled fan of the brushless sweeper in this utility model;

[0019] Figure 2 This is an axial cross-sectional view of the brushless sweeper fan in this utility model;

[0020] Figure 3 This is a schematic diagram of the bearing housing in this utility model;

[0021] Figure 4 This is a schematic diagram of the outer rotor assembly in this utility model.

[0022] The annotations in the attached figures are explained as follows:

[0023] 10 is the volute, 11 is the air inlet, 12 is the mounting hole, 20 is the bearing housing, 21 is the riveting edge, 211 is the operating slope, 30 is the inner stator assembly, 31 is the stator core, 40 is the outer rotor assembly, 41 is the rotating shaft, 42 is the upper bearing, 43 is the upper retaining ring, 44 is the spring, 45 is the lower bearing, 46 is the lower retaining ring, 47 is the rotor housing, 471 is the balance block, 48 is the magnetic ring, 50 is the PCBA board, 51 is the mounting port, 52 is the copper surface, 60 is the fan blade, and 70 is the protective cover. Detailed Implementation

[0024] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0025] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0026] To facilitate assembly and reduce production costs, the specific details of this utility model are as follows.

[0027] Combination Figure 1 , Figure 2 , Figure 3 As shown, an embodiment of this utility model is a brushless sweeper fan, which, importantly, includes a volute 10, a bearing housing 20, an inner stator assembly 30, an outer rotor assembly 40, a PCBA board 50, and a fan blade 60.

[0028] An air inlet 11 is provided at the center of the lower side of the volute 10, and a mounting hole 12 is provided at the center of the upper side.

[0029] The lower section of the bearing housing 20 is fixedly installed in the mounting hole 12 of the volute 10, and the upper end is located outside the mounting hole 12 of the volute 10. An inner stator assembly 30 is provided on the outer side of the top of the upper end. An outer rotor assembly 40 is rotatably installed in the hollow interior of the bearing housing 20. The upper part of the outer rotor assembly 40 covers the outer side of the inner stator assembly 30. A riveting edge 21 is provided on the outer side of the middle section of the bearing housing 20, and an operating inclined surface 211 is provided on the inner side of the riveting edge 21.

[0030] PCBA board 50 is fitted onto the outside of the riveting edge 21 through the mounting port 51 provided in the middle;

[0031] The fan blade 60 is located inside the volute 10 and is fixedly mounted at the bottom of the outer rotor assembly 40;

[0032] PCBA board 50 is fixed to the outer side of the middle section of bearing seat 20 by operating the extrusion operation slope 211 and riveting along the riveting edge 21.

[0033] The main feature of this invention is that a riveting edge 21 is provided on the outer side of the middle section of the brushless sweeper fan bearing seat 20. The PCBA board 50 is riveted and fixed to the outer side of the middle section of the bearing seat 20 by operating the pressing operation slope 211 to expand the riveting edge 21, which eliminates the need for screws, or compared with riveting with galvanized steel plate, it eliminates the need for steel plate and insulating paper, making the assembly operation more convenient and reducing labor and material costs.

[0034] Furthermore, in some embodiments, such as Figure 1 As shown, in order to prevent electrostatic discharge from damaging the PCBA board 50, a copper surface 52 is arranged on the mounting port 51 of the PCBA board 50 and electrically connected to the PCBA board 50. After the PCBA board 50 is riveted and fixed, the copper surface 52 contacts and is electrically connected to the bearing seat 20. The copper surface 52 on the mounting port 51 of the PCBA board 50 makes contact and electrically connect the PCBA board 50 to the bearing seat 20 after riveting and fixing, so that the motor body and the PCBA board 50 are in a conductive state, reducing the EMC of the motor and preventing electrostatic discharge from directly damaging the PCBA board 50 and causing damage to the motor.

[0035] Furthermore, in some embodiments, such as Figure 4 As shown, to improve the stability of the rotor assembly, the outer rotor assembly 40 includes a shaft 41, an upper bearing 42, an upper retaining ring 43, a spring 44, a lower bearing 45, a lower retaining ring 46, a rotor housing 47, and a magnetic ring 48. The upper bearing 42 is mounted on the shaft 41 via the upper retaining ring 43, and the lower bearing 45 is mounted on the shaft 41 via the lower retaining ring 46. The spring 44 is sleeved on the shaft 41, with its two ends abutting against the upper bearing 42 and the lower bearing 45, respectively. The shaft 41 is rotatably mounted inside the hollow cavity of the bearing housing 20 via the upper bearing 42 and the lower bearing 45. The rotor housing 47 is fixedly mounted on the top of the shaft 41, and the magnetic ring 48 is fixedly mounted inside the rotor housing 47 and covers the outside of the inner stator assembly 30. The fan blade 60 is fixedly mounted on the bottom of the shaft 41. This design, by replacing the wave washer with the spring 44, improves the elastic stability of the spring 44, resulting in better rotor stability and reduced bearing noise.

[0036] Furthermore, in some embodiments, such as Figure 1 or Figure 4 As shown, in order to improve the rotational stability of the rotor housing 47, a balance block 471 is provided on the outer edge of the upper end of the rotor housing 47. The balance block 471 keeps the rotor housing 47 in dynamic balance when rotating at high speed, thus making the rotation more stable.

[0037] In some embodiments, such as Figure 1 As shown, the inner stator assembly 30 includes a stator core 31, on which a stator coil is wound. The stator coil is electrically connected to the PCBA board 50. The stator core 31 is fixedly mounted on the outer side of the top of the upper end of the bearing seat 20. This is a general design of the inner stator, but other suitable inner stator structure designs are also possible.

[0038] Furthermore, in some embodiments, such as Figure 1 As shown, in order to prevent the rotor balance weight from scratching people when it rotates, a protective cover 70 is also provided on the outside of the outer rotor assembly 40. The protective cover 70 is located on the upper side of the volute 10 and covers the upper end of the outer rotor assembly 40, which can prevent the rotor balance weight from scratching people when it rotates.

[0039] The above description is merely illustrative of the embodiments of this utility model and is not intended to limit the scope of this utility model. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model without creative labor should be included within the protection scope of this utility model.

Claims

1. A brushless sweeper fan, characterized in that, It includes: The volute (10) has an air inlet (11) at its lower center and an mounting hole (12) at its upper center. The bearing housing (20) has its lower section fixedly installed in the mounting hole (12) of the volute (10), and its upper end located outside the mounting hole (12) of the volute (10). An inner stator assembly (30) is provided on the outer side of the top of its upper end. An outer rotor assembly (40) is rotatably installed in the hollow interior of the bearing housing (20). The upper part of the outer rotor assembly (40) covers the outer side of the inner stator assembly (30). A riveting edge (21) is provided on the outer side of the middle section of the bearing housing (20), and an operating inclined surface (211) is provided on the inner side of the riveting edge (21). The PCBA board (50) is fitted onto the outside of the riveting edge (21) through the mounting port (51) provided in the middle; The fan blade (60) is located inside the volute (10) and fixedly mounted at the bottom of the outer rotor assembly (40); The PCBA board (50) is riveted to the outer side of the middle section of the bearing seat (20) by means of the operation pressing operation slope (211) and the riveting edge (21).

2. The brushless sweeper fan according to claim 1, characterized in that: A copper surface (52) is arranged on the mounting port (51) of the PCBA board (50) and electrically connected to the PCBA board (50). After the PCBA board (50) is riveted and fixed, the copper surface (52) contacts and electrically connects to the bearing seat (20).

3. The brushless sweeper fan according to claim 1, characterized in that: The outer rotor assembly (40) includes a rotating shaft (41), an upper bearing (42), an upper retaining ring (43), a spring (44), a lower bearing (45), a lower retaining ring (46), a rotor housing (47), and a magnetic ring (48). The upper bearing (42) is mounted on the rotating shaft (41) via the upper retaining ring (43), and the lower bearing (45) is mounted on the rotating shaft (41) via the lower retaining ring (46). The spring (44) is sleeved on the rotating shaft (41) and its two ends abut against the upper bearing (42) and the lower bearing (45) respectively. The rotating shaft (41) is rotatably mounted in the hollow cavity inside the bearing seat (20) via the upper bearing (42) and the lower bearing (45). The rotor housing (47) is fixedly mounted on the top of the rotating shaft (41), and the magnetic ring (48) is fixedly mounted inside the rotor housing (47) and covers the outside of the inner stator assembly (30). The fan blade (60) is fixedly mounted on the bottom of the rotating shaft (41).

4. The brushless sweeper fan according to claim 3, characterized in that: A balance block (471) is provided on the outer edge of the upper end of the rotor housing (47).

5. The brushless sweeper fan according to claim 1, characterized in that: The inner stator assembly (30) includes a stator core (31), on which a stator coil is wound. The stator coil is electrically connected to the PCBA board (50), and the stator core (31) is fixedly disposed on the outer side of the top of the upper end of the bearing seat (20).

6. The brushless sweeper fan according to claim 1, characterized in that: A protective cover (70) is also provided on the outside of the outer rotor assembly (40). The protective cover (70) is located on the upper side of the volute (10) and covers the upper end of the outer rotor assembly (40).

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