Permanent magnet direct current brush fan

Abstract

The utility model relates to a permanent magnet direct current brush fan, which comprises a motor comprising a rotor assembly, a stator assembly, a brush carrier assembly and an end cover, one end of the rotor assembly is mounted in the end cover; the brush carrier assembly is fixed on the end cover and is connected with the rotor assembly; a certain air gap is kept between the stator assembly and the rotor assembly, and the rotor assembly can rotate in the stator assembly; the fixed impeller is fixedly arranged on the outer wall of one end of the motor; and the movable impeller is fixed at the other end of the rotor assembly through a nut. According to the utility model, the whole fan is convenient to mount and dismount, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a permanent magnet DC brushed fan with a nut-type structure. Background Technology

[0002] A brushed DC fan is a power unit that combines a brushed DC motor with a fan impeller. The brushed DC motor is based on Faraday's law of electromagnetic induction, using a commutator and brushes to switch the direction of current, driving the rotor to rotate continuously. With improvements in permanent magnet materials (such as neodymium iron boron) and brush materials, brushed DC motors have achieved breakthroughs in efficiency and miniaturization, and are gradually being applied in the fan industry.

[0003] The structure of existing conventional DC brushed fans is as follows: Figure 1 As shown. The DC brushed fan includes a motor 100, a fixed impeller 30, and a moving impeller 20. The motor 100 includes a rotor assembly 50, a stator assembly 40, a brush holder assembly 60, and an end cover 70. Ball bearings 83 are provided at both ends of the rotor assembly 50, and one end of the ball bearing 83 is installed inside the end cover 70. The brush holder assembly 60 is fixed to the end cover 70 and connected to the rotor assembly 50. A certain air gap is maintained between the stator assembly 40 and the rotor assembly 50, allowing the rotor assembly 50 to rotate within the stator assembly 40. The fixed impeller 30 is fixedly mounted on the outer wall of one end of the motor 100, and the fixed impeller 30 and the stator assembly 40 are connected together by fasteners 81, such as bolts. The moving impeller 20 is pressed against the other end of the rotor assembly 50. The gap between the fixed impeller 30 and the stator assembly 40 can be sealed using a seal 82, such as an O-ring.

[0004] In addition, Chinese utility model patent (CN202068269U) discloses a vacuum cleaner motor with an integrated impeller assembly, which includes an impeller with a lower plate, a bushing located on one side of the lower plate, a pressure ring located on the other side of the lower plate and having a pressure ring hole, and a motor shaft passing through the pressure ring hole, the lower plate, and the bushing. The lower plate has a shaft hole, and the bushing passes through the shaft hole and the pressure ring hole and is fastened to the pressure ring by stamping.

[0005] As mentioned above, the existing impeller is a one-piece press-fit structure, meaning it is tightly integrated with the shaft and cannot usually be disassembled using simple tools. If the impeller or shaft malfunctions, the entire assembly needs to be replaced, resulting in high maintenance costs. For example, if a blade on the impeller is damaged, it cannot be replaced individually; the entire impeller assembly must be replaced. Furthermore, because the impeller and shaft are a single unit, maintenance requires disassembling the entire fan casing and other components to access the impeller. This increases the complexity and time cost of maintenance. For instance, during maintenance, it may be necessary to disassemble components such as the motor and bearings, increasing the difficulty and risk of repairs. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model discloses a permanent magnet DC brushed fan.

[0007] The technical solution adopted in this utility model is as follows:

[0008] A permanent magnet DC brushed fan, comprising:

[0009] An electric motor includes a rotor assembly, a stator assembly, a brush holder assembly, and an end cover; one end of the rotor assembly is installed inside the end cover; the brush holder assembly is fixed to the end cover and connected to the rotor assembly; the stator assembly and the rotor assembly maintain a certain air gap, and the rotor assembly can rotate within the stator assembly;

[0010] A fixed impeller is fixedly mounted on the outer wall of one end of the motor;

[0011] The moving impeller is fixed to the other end of the rotor assembly by a nut.

[0012] In one embodiment of the present invention, the rotor assembly includes a rotating shaft, a permanent magnet, and a commutator; the rotating shaft is mounted inside the end cover via a bearing; the permanent magnet is fixed on the rotating shaft and connected to the brush holder assembly via the commutator.

[0013] In one embodiment of the present invention, the rotor assembly further includes a cooling fan sleeved on the rotating shaft.

[0014] In one embodiment of this utility model, the outer diameter of the rotating shaft is 4mm.

[0015] In one embodiment of the present invention, the stator assembly includes a stator core and a stator winding embedded in the stator core.

[0016] In one embodiment of the present invention, the fixed impeller includes a mounting flange, a hub disposed at the end of the mounting flange, and a plurality of blades fixed within the hub.

[0017] In one embodiment of the present invention, a bushing is further included, which is sleeved on one end of the rotating shaft and is interference-fitted with the rotating shaft; the bushing separates the rotating shaft and the moving impeller.

[0018] In one embodiment of this utility model, a first pressure ring and a second pressure ring are further included for pressing the moving impeller; the surface of the first pressure ring is attached to the first surface of the moving impeller; the surface of the second pressure ring is attached to the second surface of the moving impeller; and the inner walls of the first pressure ring and the second pressure ring are attached to the outer wall of the bushing.

[0019] In one embodiment of this utility model, a wind shield is also included; the fixed impeller is installed inside the wind shield.

[0020] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0021] The impeller of the permanent magnet DC brushed fan described in this utility model is changed from an integrated press-fit structure to a structure fixed with a nut. The nut is available in a variety of specifications and sizes to meet the needs of different application scenarios. The nut can be disassembled and reassembled multiple times without damage. As long as the threads are not damaged, it can be reused, reducing maintenance costs and facilitating the installation and disassembly of the permanent magnet DC brushed fan. Attached Figure Description

[0022] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0023] Figure 1 This is an exploded view of an existing integrated press-fitted fan.

[0024] Figure 2 This is the front view of the permanent magnet DC brushed fan in this utility model.

[0025] Figure 3 This is a bottom view of the permanent magnet DC brushed fan in this utility model.

[0026] Figure 4 This is a cross-sectional view of the permanent magnet DC brushed fan in this utility model.

[0027] Figure 5 This is an exploded view of the permanent magnet DC brushed fan in this utility model.

[0028] Figure 6 This is a schematic diagram of the structure of the fixed impeller in this utility model.

[0029] Figure 7 This is a schematic diagram of the stator assembly in this utility model.

[0030] Figure 8 This is a schematic diagram of the rotor assembly in this utility model.

[0031] Explanation of reference numerals in the instruction manual:

[0032] 100. Electric motor;

[0033] 10. Fan shroud; 20. Moving impeller; 30. Stator impeller; 301. Mounting flange; 302. Hub; 303. Blade; 40. Stator assembly; 401. Stator core; 402. Stator winding; 50. Rotor assembly; 501. Shaft; 502. Permanent magnet; 503. Commutator; 504. Cooling fan; 60. Brush holder assembly; 70. End cover;

[0034] 81. Fasteners; 82. Seals; 83. Ball bearings; 84. Nuts; 85. Bushings; 86. First pressure ring; 87. Second pressure ring. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0036] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present utility model. Furthermore, in all embodiments, the same reference numerals denote the same elements. Example 1

[0037] Combination Figures 2 to 5 A permanent magnet DC brushed fan includes a motor 100, a fixed impeller 30, and a moving impeller 20. The motor 100 includes a rotor assembly 50, a stator assembly 40, a brush holder assembly 60, and an end cover 70. One end of the rotor assembly 50 is mounted inside the end cover 70. The brush holder assembly 60 is fixed to the end cover 70 and connected to the rotor assembly 50. A certain air gap is maintained between the stator assembly 40 and the rotor assembly 50, allowing the rotor assembly 50 to rotate within the stator assembly 40. The fixed impeller 30 is fixed to the outer wall of one end of the motor 100. The moving impeller 20 is fixed to the other end of the rotor assembly 50 by a nut 84.

[0038] Specifically, in combination Figure 8 The rotor assembly 50 includes a shaft 501, a permanent magnet 502, and a commutator 503. The shaft 501 is mounted inside the end cover 70 via bearings. The permanent magnet 502 is fixed to the shaft 501 and connected to the brush holder assembly 60 via the commutator 503.

[0039] Furthermore, the rotor assembly 50 also includes a cooling fan 504 mounted on the shaft 501. The cooling fan 504 provides effective heat dissipation to ensure that the motor remains within a safe operating temperature range during operation.

[0040] In addition, combined Figure 4 The outer diameter of the rotating shaft 501 is 4mm. It should be noted that the existing outer diameter of the rotating shaft 501 is 3.175mm. This embodiment improves the outer diameter of the rotating shaft 501 by changing it from 3.175mm to 4mm, which can effectively reduce the vibration of the permanent magnet DC fan and optimize product performance.

[0041] Combination Figure 7 The stator assembly 40 includes a stator core 401 and a stator winding 402 embedded within the stator core 401. Specifically, the stator winding 402 is embedded in a slot in the stator core 401 and is isolated from the stator core 401 by an insulating material.

[0042] Combination Figure 6 The impeller 30 includes a mounting flange 301, a hub 302 located at the end of the mounting flange 301, and multiple blades 303 fixed within the hub 302. The multiple blades 303 can be evenly or non-uniformly distributed. The shape of the blades 303 is typically designed according to the fluid flow characteristics, and the angle of the blades 303 is typically precisely adjusted according to design requirements to ensure that the fluid has appropriate pre-swirl and velocity distribution before entering the impeller. The hub 302 is secured by fasteners 81. In this embodiment, the fasteners 81 can be Phillips head screws, which can withstand large tensile and shear forces, ensuring the strength and reliability of the connection. The screw's thread design and head shape help prevent loosening, especially in vibration and impact environments. The Phillips head design of the screw head makes installation and removal very convenient using a Phillips screwdriver or power tool.

[0043] The installation steps in this embodiment are as follows:

[0044] S1. The stator winding 402 is embedded into the slot of the stator core 401 according to the design requirements to form the stator assembly 40;

[0045] S2. Coaxially assemble the rotating shaft 501 and the permanent magnet 502; install bearings at both ends of the rotating shaft 501; install the commutator 503 at one end of the rotating shaft 501 to form the rotor assembly 50.

[0046] S3. Install the stator assembly 40 and the rotor assembly 50 into the mounting flange 301 of the stator impeller 30, with the end of the shaft 501 without the commutator 503 extending out of the stator impeller 30.

[0047] S4. Install the moving impeller 20 on the end of the rotating shaft 501 where the commutator 503 is not installed, and fix the moving impeller 20 to the end of the rotating shaft 501 where the commutator 503 is not installed with nut 84. Example 2

[0048] Based on Example 1, such as Figure 8 As shown, the permanent magnet DC fan also includes a bushing 85 fitted onto one end of the rotating shaft 501 and interference-fitted with it. The bushing 85 separates the rotating shaft 501 from the impeller 20. The bushing 85 can significantly reduce the wear of the rotating shaft 501 and extend its service life. Furthermore, the bushing 85 provides stable mechanical support for the rotating shaft 501, ensuring that the rotating shaft 501 maintains concentric rotation during operation and reducing vibration and eccentricity.

[0049] The installation principle of this embodiment is basically the same as that of Embodiment 1, and will not be repeated here. Example 3

[0050] Based on Embodiment 1 or Embodiment 2, such as Figure 4 As shown, the permanent magnet DC fan also includes a first pressure ring 86 and a second pressure ring 87 that press against the moving impeller 20. The surface of the first pressure ring 86 is attached to the first surface of the moving impeller 20. The surface of the second pressure ring 87 is attached to the second surface of the moving impeller 20. The inner walls of the first pressure ring 86 and the second pressure ring 87 are attached to the outer wall of the bushing 85.

[0051] The installation principle of this embodiment is basically the same as that of Embodiment 1, and will not be repeated here. Example 4

[0052] Based on any one of the embodiments from Example 1 to Example 3, such as Figure 2 As shown, the permanent magnet DC brushed fan also includes a shroud 10. The stator impeller 30 is installed inside the shroud 10. The shroud 10 protects the internal components of the permanent magnet DC brushed fan from external mechanical impacts and damage. It provides a robust enclosure for the permanent magnet DC brushed fan, preventing dust, debris, and liquids from entering the fan. Furthermore, the inner surface of the shroud 10 is typically designed to be streamlined, effectively guiding airflow into and out of the permanent magnet DC brushed fan.

[0053] The installation principle of this embodiment is basically the same as that of Embodiment 1, and will not be repeated here.

[0054] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0055] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A permanent magnet DC brushed fan, characterized in that, include: The motor (100) includes a rotor assembly (50), a stator assembly (40), a brush holder assembly (60), and an end cap (70); one end of the rotor assembly (50) is installed inside the end cap (70); the brush holder assembly (60) is fixed to the end cap (70) and connected to the rotor assembly (50); the stator assembly (40) and the rotor assembly (50) maintain a certain air gap, and the rotor assembly (50) can rotate within the stator assembly (40); A fixed impeller (30) is fixedly mounted on the outer wall of one end of the motor (100); The impeller (20) is fixed to the other end of the rotor assembly (50) by a nut (84).

2. The permanent magnet DC brushed fan according to claim 1, characterized in that, The rotor assembly (50) includes a shaft (501), a permanent magnet (502), and a commutator (503); the shaft (501) is mounted in the end cover (70) by a bearing; the permanent magnet (502) is fixed on the shaft (501) and connected to the brush holder assembly (60) by the commutator (503).

3. The permanent magnet DC brushed fan according to claim 2, characterized in that, The rotor assembly (50) also includes a cooling fan (504) fitted onto the shaft (501).

4. The permanent magnet DC brushed fan according to claim 2, characterized in that, The outer diameter of the shaft (501) is 4 mm.

5. The permanent magnet DC brushed fan according to claim 1, characterized in that, The stator assembly (40) includes a stator core (401) and a stator winding (402) embedded in the stator core (401).

6. The permanent magnet DC brushed fan according to claim 1, characterized in that, The fixed impeller (30) includes a mounting flange (301), a hub (302) located at the end of the mounting flange (301), and a plurality of blades (303) fixed in the hub (302).

7. The permanent magnet DC brushed fan according to claim 2, characterized in that, It also includes a bushing (85) sleeved on one end of the rotating shaft (501) and interference-fitted with the rotating shaft (501); the bushing (85) separates the rotating shaft (501) and the impeller (20).

8. The permanent magnet DC brushed fan according to claim 7, characterized in that, It also includes a first pressure ring (86) and a second pressure ring (87) that press the moving impeller (20); the surface of the first pressure ring (86) is attached to the first surface of the moving impeller (20); the surface of the second pressure ring (87) is attached to the second surface of the moving impeller (20); the inner walls of the first pressure ring (86) and the second pressure ring (87) are attached to the outer wall of the bushing (85).

9. The permanent magnet DC brushed fan according to claim 1, characterized in that, It also includes a wind shield (10); the fixed impeller (30) is installed inside the wind shield (10).

Images