Rotor fan blade for brushless motor

Abstract

The utility model discloses a rotor fan blade for a brushless motor, which relates to the technical field of brushless motors and comprises a rotating shaft, one end of a mounting block is fixedly connected with a first expansion ring, the inner wall of the mounting block is provided with a second expansion ring, the first expansion ring is communicated with the second expansion ring, and the surface of the rotating shaft is provided with a sealing groove. When the installation block is installed, the installation block is pressed against the rotor, the rotor extrudes the first expansion ring, air in the first expansion ring enters the second expansion ring, the second expansion ring expands and becomes larger under the influence of air and is clamped into the sealing groove, and the position of the installation block is locked through mutual cooperation of the second expansion ring and the sealing groove. The fan blades are prevented from moving. When the rotating shaft rotates, the fan blades rotate along with the rotating shaft, at the moment, the limiting balls move outwards under the action of centrifugal force, overcome the tension of the extension springs and then move outwards, the limiting balls enter the limiting holes, the mounting blocks are further locked, and angle deviation of the mounting blocks during rotation is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, in particular to a rotor blade for a brushless motor. Background Art

[0002] The motor rotor is also a rotating component in the motor. A motor consists of two parts: the rotor and the stator. It is a device used to convert electrical energy into mechanical energy and vice versa. Motor rotors are categorized as motor rotors and generator rotors. The rotor of a brushless DC motor consists of permanent magnets with a specific number of pole pairs embedded on the surface or within the core. The rotor structure of a brushless DC motor often utilizes surface-mounted magnetic poles, also known as tile-shaped magnetic poles. Surface-mounted magnetic poles consist of radially magnetized tile-shaped rare earth permanent magnets attached to the outer surface of the core. Proper design can produce a square-wave air gap flux density.

[0003] After searching the existing public patent number: CN202221683678.0, the public patent name is: A rotor fan blade for a brushless motor, including a circular body, a plurality of blades are evenly arranged on the outer periphery of one end of the circular body, an end of the circular body away from the blades is provided with an extrusion portion extending forward, the inner side surface of the extrusion portion is provided with a tolerance adjustment ring and an extrusion deformation ring protruding outward, the extrusion deformation ring is located at the outer diameter edge of the circular inner groove, and the tolerance adjustment ring is located at the outer diameter edge of the extrusion portion. Both the tolerance adjustment ring and the extrusion deformation ring can be deformed by external force. When the rotor of the brushless motor is assembled, the extrusion deformation ring can press the magnet to ensure that the magnet is stable and will not loosen, thereby avoiding friction noise between the magnet and the rotor chip. It can also save the process of using glue to seal the magnet in the traditional process and completely replace the gluing process. The tolerance adjustment ring and the extrusion deformation ring can also adjust the dimensional deviation caused by the tolerance of the parts through extrusion deformation to improve the accuracy of the brushless motor after assembly.

[0004] However, the above device is not convenient for fixing the position of the fan blades. The fan blades will move during rotation, and the squeezing force on the magnets will change, which has certain shortcomings. Utility Model Content

[0005] (1) Technical problems solved

[0006] In view of the deficiencies in the prior art, the present invention provides a rotor fan blade for a brushless motor, which solves the problem that the fan blade may move during rotation.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a rotor fan blade for a brushless motor, comprising: a rotating shaft, a rotor provided on the surface of the rotating shaft, a mounting block plugged into the rotating shaft, a mounting hole having the same diameter as the rotating shaft on the surface of the mounting block, fan blades arranged in a circumferential array on one side of the mounting block, a second bearing and a first bearing respectively plugged into the surface of the rotating shaft, and a sealing assembly provided on the mounting block;

[0009] One end of the mounting block is fixedly connected to a first expansion ring, an inner wall of the mounting block is provided with a second expansion ring, the first expansion ring is communicated with the second expansion ring, and a sealing groove is provided on the surface of the rotating shaft.

[0010] Preferably, the second expansion ring has the same width as the sealing groove, and the inner wall of the installation block is provided with an installation groove matching the second expansion ring.

[0011] Preferably, the mounting block has a circumferential array of weight-reducing holes on one side close to the rotor, and an extrusion bar is fixedly connected to the side of the mounting block close to the weight-reducing holes, and the extrusion bar is arranged in an arc shape.

[0012] Preferably, an anti-slip assembly is provided on the rotating shaft, a mounting bar is fixedly connected inside the rotating shaft, tension springs are symmetrically provided on both sides of the mounting bar, one end of the tension spring is fixedly connected to a limiting ball, and a limiting hole is provided in the mounting block.

[0013] Preferably, the limiting hole and the limiting ball have the same diameter, and the limiting hole is symmetrically arranged inside the mounting block.

[0014] Preferably, the fan blades are arranged in an arc shape and are arranged as nylon blades.

[0015] Preferably, the thickness of the first expansion ring is twice the thickness of the extrusion strip, and the first expansion ring and the second expansion ring are configured as rubber rings.

[0016] Beneficial effects

[0017] The present invention provides a rotor blade for a brushless motor, which has at least the following beneficial effects compared to the prior art:

[0018] When installing the mounting block, press it against the rotor, squeezing the first expansion ring through the rotor. Air inside the first expansion ring enters the second expansion ring, which expands under the influence of the gas and snaps into the sealing groove. The second expansion ring and the sealing groove work together to lock the mounting block in place, preventing the blades from moving. As the shaft rotates, the blades follow suit. The retaining ball moves outward under centrifugal force, overcoming the tension of the tension spring and moving outward. The retaining ball enters the retaining hole, further locking the mounting block and preventing the block from shifting during rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a cross-sectional view of the utility model;

[0021] Figure 3 This is a schematic structural diagram of the sealing assembly of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the anti-slip component of the utility model.

[0023] In the figure: 1. rotating shaft; 2. rotor; 3. first bearing; 4. second bearing; 5. mounting block; 6. fan blade; 7. sealing assembly; 701. first expansion ring; 702. second expansion ring; 703. sealing groove; 8. anti-slip assembly; 801. mounting strip; 802. tension spring; 803. limiting ball; 804. limiting hole; 9. weight-reducing hole; 10. extrusion strip; 11. mounting hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example 1:

[0026] See also Figure 1-4 The present invention provides a technical solution: a rotating shaft 1, a rotor 2 being provided on the surface of the rotating shaft 1, a mounting block 5 being inserted into the rotating shaft 1, a mounting hole 11 having the same diameter as the rotating shaft 1 being provided on the surface of the mounting block 5, a fan blade 6 being arranged in a circumferential array on one side of the mounting block 5, a second bearing 4 and a first bearing 3 being respectively inserted into the surface of the rotating shaft 1, and a sealing assembly 7 being provided on the mounting block 5; a first expansion ring 701 being fixedly connected to one end of the mounting block 5, a second expansion ring 702 being provided on the inner wall of the mounting block 5, the first expansion ring 701 and the second expansion ring 702 being connected, and a sealing groove 703 being provided on the surface of the rotating shaft 1. The thickness of the first expansion ring 701 is twice that of the extruded strip 10, and the first and second expansion rings 701 and 702 are configured as rubber rings.

[0027] Analyzing the above: Pressing mounting block 5 toward rotor 2 squeezes first expansion ring 701 through rotor 2, causing the air inside first expansion ring 701 to flow into second expansion ring 702. Under the influence of the air, second expansion ring 702 expands and snaps into sealing groove 703. The interaction between second expansion ring 702 and sealing groove 703 locks mounting block 5 in place, preventing blade 6 from moving. When first expansion ring 701 is flush with extrusion strip 10, second expansion ring 702 expands to its maximum volume, securing the magnet in place through extrusion strip 10.

[0028] Example 2:

[0029] See also Figure 1-4 The present invention provides a technical solution based on the first embodiment: the second expansion ring 702 has the same width as the sealing groove 703 , and the inner wall of the mounting block 5 is provided with a mounting groove matching the second expansion ring 702 .

[0030] Analysis of the above content: The second expansion ring 702 is expanded to lock with the sealing groove 703, so that the mounting block 5 is connected and fixed to the rotating shaft 1, preventing the mounting block 5 from moving.

[0031] Example 3:

[0032] See also Figure 1-4 The present invention provides a technical solution based on the first embodiment: a circumferential array of weight-reducing holes 9 is provided on the side of the mounting block 5 close to the rotor 2, and an extrusion strip 10 is fixedly connected to the side of the mounting block 5 close to the weight-reducing holes 9, and the extrusion strip 10 is arranged in an arc shape.

[0033] Analysis of the above content: The weight of the mounting block 5 is reduced by the weight-reducing hole 9, and the extrusion bar 10 is provided to squeeze and fix the magnets on the rotor 2 to prevent the magnets from moving and reduce noise. At the same time, it can also save the process of sealing the magnets with glue in the traditional process, completely replace the gluing process, reduce the manufacturing cost of the brushless motor, and completely eliminate a series of quality problems caused by missing, insufficient, or excessive gluing.

[0034] Example 4:

[0035] See also Figure 1-4 The utility model provides a technical solution based on embodiment 1: an anti-slip component 8 is provided on the rotating shaft 1, a mounting bar 801 is fixedly connected to the inside of the rotating shaft 1, tension springs 802 are symmetrically provided on both sides of the mounting bar 801, one end of the tension spring 802 is fixedly connected to a limiting ball 803, and a limiting hole 804 is opened in the mounting block 5.

[0036] Analysis of the above content: When the shaft 1 rotates, the limiting ball 803 moves outward under the action of centrifugal force. When the speed of the shaft 1 increases, the limiting ball 803 overcomes the tension of the tension spring 802 and moves toward the limiting hole 804. The position of the mounting block 5 is locked by the mutual cooperation between the limiting ball 803 and the limiting hole 804, thereby preventing the mounting block 5 from moving during rotation and causing the pressing of the magnet to fail.

[0037] Embodiment 5:

[0038] See also Figure 1-4 The present invention provides a technical solution based on the first embodiment: the limiting hole 804 has the same diameter as the limiting ball 803 , and the limiting hole 804 is symmetrically arranged inside the mounting block 5 .

[0039] Analysis of the above content: The limiting ball 803 enters the limiting hole 804, so that the limiting ball 803 and the limiting hole 804 are locked, thereby avoiding deviation between the rotating shaft 1 and the mounting block 5 and ensuring the fixing effect of the mounting block 5.

[0040] Example 6:

[0041] See also Figure 1-4 The present invention provides a technical solution based on the first embodiment: the fan blade 6 is arranged in an arc shape, and the fan blade 6 is arranged as a nylon blade.

[0042] Analysis of the above content: The rotor 2 is cooled by the rotation of the fan blades 6, and the arc-shaped setting facilitates the flow of air and improves the heat dissipation effect.

[0043] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotor blade for a brushless motor, characterized in that: include: A rotating shaft (1), a rotor (2) is provided on the surface of the rotating shaft (1), a mounting block (5) is plugged into the rotating shaft (1), a mounting hole (11) having the same diameter as the rotating shaft (1) is opened on the surface of the mounting block (5), a fan blade (6) is arranged in a circumferential array on one side of the mounting block (5), a second bearing (4) and a first bearing (3) are respectively plugged into the surface of the rotating shaft (1), and a sealing assembly (7) is provided on the mounting block (5); One end of the mounting block (5) is fixedly connected to a first expansion ring (701), an inner wall of the mounting block (5) is provided with a second expansion ring (702), the first expansion ring (701) is communicated with the second expansion ring (702), and a sealing groove (703) is provided on the surface of the rotating shaft (1).

2. The rotor blade for a brushless motor according to claim 1, characterized in that: The second expansion ring (702) has the same width as the sealing groove (703), and the inner wall of the installation block (5) is provided with an installation groove matching the second expansion ring (702).

3. The rotor blade for a brushless motor according to claim 1, characterized in that: The mounting block (5) has a circumferential array of weight-reducing holes (9) on one side close to the rotor (2), and an extrusion strip (10) is fixedly connected to the side of the mounting block (5) close to the weight-reducing holes (9), and the extrusion strip (10) is arranged in an arc shape.

4. The rotor blade for a brushless motor according to claim 1, characterized in that: An anti-slip assembly (8) is provided on the rotating shaft (1), a mounting bar (801) is fixedly connected inside the rotating shaft (1), tension springs (802) are symmetrically provided on both sides of the mounting bar (801), one end of the tension spring (802) is fixedly connected to a limiting ball (803), and a limiting hole (804) is provided in the mounting block (5).

5. The rotor blade for a brushless motor according to claim 4, characterized in that: The limiting hole (804) has the same diameter as the limiting ball (803), and the limiting hole (804) is symmetrically arranged inside the mounting block (5).

6. The rotor blade for a brushless motor according to claim 1, characterized in that: The fan blades (6) are arranged in an arc shape, and the fan blades (6) are arranged as nylon blades.

7. The rotor blade for a brushless motor according to claim 3, characterized in that: The thickness of the first expansion ring (701) is twice the thickness of the extrusion strip (10), and the first expansion ring (701) and the second expansion ring (702) are configured as rubber rings.

Images