Direct-current brushless motor with fan blade positioning and supporting structure

Abstract

The utility model provides a direct current brushless motor with a fan blade positioning and supporting structure, which comprises a motor body and a supporting seat for supporting fan blades, the supporting seat is sleeved and fixed on a rotating shaft of the motor body; the supporting seat and the rotating shaft are axially and circumferentially limited; an annular boss is arranged at the upper end of the supporting base, a plurality of limiting blocks are arranged on the outer side wall of the annular boss in the circumferential direction, a shaft hole used for being matched with the rotating shaft in an inserted mode is formed in the middle of the fan blade, a protruding block is coaxially arranged in the middle of the lower end of the fan blade, and an inserting groove used for being matched with the annular boss in an inserted mode is formed in the inner side of the protruding block. The side wall of the slot is provided with a plurality of limiting grooves in one-to-one correspondence with the plurality of limiting blocks, and each limiting block is embedded in the limiting groove in the corresponding position; an external thread is arranged on the outer wall of the upper end of the rotating shaft and used for being in threaded connection with a nut so that the nut can tightly press the fan blade on the supporting base. According to the utility model, the condition of relative rotation between the fan blades and the rotating shaft can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically, to a DC brushless motor with a fan blade positioning and support structure. Background Technology

[0002] Brushless DC motors are commonly used drive components, such as those used in air fryers to drive the rotation of cooling fan blades. In existing brushless DC motor structures, the outer wall of the motor shaft has an annular protrusion. The shaft hole on the fan blade is inserted into the shaft, and the bottom of the fan blade is supported on the annular protrusion. A nut is threaded onto the shaft above the fan blade, and the fan blade is pressed against the annular protrusion by the nut to secure it to the shaft. However, in the above structure, since the fan blade and the shaft do not have a circumferential limiting structure, that is, the fan blade is only pressed against the annular protrusion by the nut, slippage can easily occur between the fan blade, the annular protrusion, and the shaft when the brushless DC motor drives the fan blade to rotate, which will affect the reliability of the brushless DC motor driving the fan blade to rotate. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a DC brushless motor with a fan blade positioning and support structure, which can effectively avoid relative rotation between the fan blade and the shaft, that is, improve the reliability and stability of the DC brushless motor driving the fan blade rotation.

[0004] This utility model provides a brushless DC motor with a fan blade positioning and support structure, including a motor body and a support base for supporting the fan blade. The support base is sleeved and fixed on the rotating shaft of the motor body, and the support base and the rotating shaft are axially and circumferentially limited. An annular boss is provided at the upper end of the support base, and several limiting blocks are provided circumferentially on the outer side wall of the annular boss. A shaft hole for engaging with the rotating shaft is provided in the middle of the fan blade. A protrusion is coaxially provided in the middle of the lower end of the fan blade, and a slot for engaging with the annular boss is provided on the inner side of the protrusion. A limiting groove corresponding to several limiting blocks is provided on the side wall of the slot, and each limiting block is fitted into the limiting groove at the corresponding position. An external thread is provided on the outer wall of the upper end of the rotating shaft, and the external thread is used to connect with a nut so that the nut presses the fan blade onto the support base.

[0005] By adopting the above structure, this utility model can effectively prevent relative rotation between the fan blade and the rotating shaft when the brushless DC motor drives the fan blade to rotate. This improves the reliability and stability of the brushless DC motor driving the fan blade to rotate.

[0006] In one possible implementation, the lower end of each limiting block is integrally connected to the upper end of the support base; by adopting this structure, the connection strength between the limiting block, the annular boss, and the support base can be further improved, thereby increasing the fracture resistance of the limiting block. The annular boss and the limiting block are integrally injection molded with the support base.

[0007] In one possible implementation, the lower end of the protrusion abuts against the upper end of the support base; by adopting this structure, the support base can reliably support the fan blade, that is, after the nut is connected to the external thread, the nut can reliably press the fan blade onto the support base.

[0008] In one possible implementation, a keyway is provided on the outer wall of the shaft, and an insert is provided on the inner peripheral wall of the support. The insert is fitted into the keyway to limit the axial and circumferential movement of the support and the shaft. With this structure, after the insert and the keyway are fitted, the axial and circumferential movement of the support and the shaft can be reliably and conveniently limited by the fitting action of the insert and the keyway.

[0009] In one possible implementation, the support is integrally injection molded onto the outer wall of the shaft; by adopting this structure, the connection strength between the support and the shaft can be improved, and it is easy to insert the block into the keyway and fit into the keyway. Attached Figure Description

[0010] Figure 1 A three-dimensional structural diagram of the assembled fan blades and DC brushless motor;

[0011] Figure 2 A three-dimensional structural diagram of a brushless DC motor;

[0012] Figure 3 This is a schematic diagram of the wind turbine blades viewed from below.

[0013] Figure 4 This is a cross-sectional view of the structure after the support base and the rotating shaft are assembled. Detailed Implementation

[0014] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0015] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0016] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0017] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] See Figure 1-4 As shown in the figure, this application discloses a DC brushless motor with a fan blade positioning and support structure, including a motor body 1 and a support base 3 for supporting the fan blade 2. The support base 3 is sleeved and fixed on the rotating shaft 11 of the motor body 1, and the support base 3 and the rotating shaft 11 are axially and circumferentially limited. An annular boss 31 is provided at the upper end of the support base 3, and a plurality of limiting blocks 32 are provided circumferentially on the outer side wall of the annular boss 31. The middle part of the fan blade 2 is provided with a fitting for engaging with the rotating shaft 11. The shaft hole 21 is connected to the fan blade 2. A protrusion 22 is coaxially provided in the middle of the lower end of the fan blade 2. The inner side of the protrusion 22 is provided with a slot 23 for engaging with the annular boss 31. The side wall of the slot 23 is provided with a limiting groove 24 corresponding to a number of limiting blocks 32. Each limiting block 32 is fitted into the limiting groove 24 at the corresponding position. The outer wall of the upper end of the rotating shaft 11 is provided with an external thread 111. The external thread 111 is used to connect with the nut so that the nut presses the fan blade 2 onto the support base 3.

[0019] The lower end of each limiting block 32 is integrally connected to the upper end of the support base 3. By adopting this structure, the connection strength between the limiting block, the annular boss, and the support base can be further improved, thereby increasing the fracture resistance of the limiting block. The annular boss and the limiting block are integrally injection molded with the support base.

[0020] The lower end of the protrusion 22 abuts against the upper end of the support 3; by adopting this structure, the support can reliably support the fan blade, that is, after the nut is connected to the external thread, the nut can reliably press the fan blade onto the support.

[0021] A keyway 112 is provided on the outer wall of the rotating shaft 11, and an insert 33 is provided on the inner peripheral wall of the support 3. The insert 33 is fitted into the keyway 112 to limit the axial and circumferential movement of the support 3 and the rotating shaft 11. With this structure, after the insert and the keyway are fitted, the axial and circumferential movement of the support 3 and the rotating shaft can be reliably and conveniently achieved under the fitting action of the insert and the keyway.

[0022] The support base 3 is integrally injection molded on the outer wall of the rotating shaft 11; by adopting this structure, the connection strength between the support base and the rotating shaft can be improved, and it is easy to insert the block into the keyway and fit into the keyway.

[0023] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A direct current brushless motor with a blade positioning and supporting structure, comprising a motor body (1), characterized in that: The direct-current brushless motor further comprises a supporting seat (3) for supporting the fan blade (2); the supporting seat (3) is sleeved and fixed on the rotating shaft (11) of the motor body (1), and the supporting seat (3) is axially and circumferentially limited with the rotating shaft (11); the upper end of the supporting seat (3) is provided with an annular boss (31), the outer side wall of the annular boss (31) is circumferentially provided with a plurality of limiting blocks (32), the middle part of the fan blade (2) is provided with a shaft hole (21) for cooperating with the rotating shaft (11), the middle part of the lower end of the fan blade (2) is coaxially provided with a protruding block (22), the inner side of the protruding block (22) is provided with a slot (23) for cooperating with the annular boss (31), the side wall of the slot (23) is provided with a limiting groove (24) corresponding to the plurality of limiting blocks (32), and each limiting block (32) is embedded in the limiting groove (24) at the corresponding position; the outer wall of the upper end of the rotating shaft (11) is provided with an external thread (111), and the external thread (111) is used for threadedly connecting with a nut to press the fan blade (2) against the supporting seat (3).

2. The direct current brushless motor with blade positioning and supporting structure according to claim 1, characterized in that: The lower end of each limiting block (32) is connected with the upper end of the supporting seat (3) integrally.

3. The direct current brushless motor with blade positioning and supporting structure according to claim 2, characterized in that: The lower end of the protruding block (22) abuts against the upper end of the supporting seat (3).

4. The direct current brushless motor with blade positioning and supporting structure according to any one of claims 1-3, characterized in that: The outer wall of the rotating shaft (11) is provided with a key groove (112), and the inner circumferential wall of the supporting seat (3) is provided with an embedded block (33), the embedded block (33) is embedded in the key groove (112) to axially and circumferentially limit the supporting seat (3) with the rotating shaft (11).

5. The direct current brushless motor with blade positioning and supporting structure according to claim 4, characterized in that: The supporting seat (3) is integrally injection molded on the outer wall of the rotating shaft (11).

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