Heat dissipation impeller for brushless motor

Abstract

The heat dissipation impeller comprises a ring body and blades, the blades are arranged on the outer side of the ring body in a surrounding mode, the ring body and the blades are of an integrated structure, the ring body is provided with through holes, the through holes penetrate through the ring body so that a rotor can be connected in a penetrating mode, and elastic clamping columns are arranged in the through holes; the blades comprise a first-stage blade and a second blade, the first-stage blade is provided with a groove, shaft holes are formed in the two ends of the groove, the two ends of the second blade extend out of column shafts, the column shafts are connected with the shaft holes so that the second blade can be hinged to the groove, and clearance positions are formed between the two sides of the second blade and the wall face of the groove; a spring is arranged in the clearance position, and the two ends of the spring are fixedly connected to the second blade and the wall of the groove respectively. The heat dissipation impeller rotates, the second blades deflect relative to the first blades under the action of centrifugal force, the deflection angles of the second blades change along with increase of the rotating speed of the heat dissipation impeller, and the springs on the two sides of the second blades are matched to adjust the deflection angles of the second blades. The device has the advantages of simple structure, compact matching, reasonable design and the like; therefore, the device is a product with excellent technical and economical performance.

Description

Technical field

[0001] Preferably, the heat dissipation impeller is installed on the rotor of the brushless motor, and the rotor is provided with a shell. The shell has a cavity, and the wall of the cavity is surrounded by a stator. Heat dissipation holes are provided at both ends of the shell to allow air to enter the cavity from outside the shell to form an air circulation.

[0002] Preferably, both ends of the rotor are provided with insertion holes, and the rotor passes through the through holes to move the elastic clamping column to the insertion hole position, and the heat dissipating impeller is fixed to the rotor through the connection between the elastic clamping column and the insertion hole, so that the heat dissipating impeller rotates with the rotor.

[0003] Preferably, a cavity is provided in the through hole, an elastic clamping column is placed in the cavity, a spring is provided in the cavity, two ends of the spring are respectively fixed to the elastic clamping column and the cavity wall, and the elastic clamping column moves in the cavity with the cooperation of the spring.

[0004] Preferably, the elastic clamping column is provided with an inclined surface.

[0005] Preferably, the length of the elastic clamping column is greater than the depth of the insertion hole.

[0006] Preferably, the heat dissipation impellers at both ends of the rotor are located in the cavity.

[0007] Preferably, the blades of the heat dissipating impellers at both ends are arranged in opposite directions.

[0008] The beneficial effects of the present invention compared with the background technology are as follows: The heat dissipation impeller of this solution utilizes an elastic snap-fit ​​structure. The rotor passes through a through hole, and the heat dissipation impeller moves along the rotor, allowing the elastic snap-fit ​​post to engage the socket, thereby securing the heat dissipation impeller to the rotor and rotating together. The heat dissipation impellers are mounted on either end of the rotor. Because the blades of the two heat dissipation impellers are arranged in opposite directions, the heat dissipation impeller at one end creates an inlet airflow, while the heat dissipation impeller at the other end creates an outlet airflow, significantly improving heat dissipation. Furthermore, this heat dissipation impeller utilizes a two-stage blade structure, where the second blade can deflect relative to the first blade, making the second blade active. The heat dissipation impeller rotates with the rotor, and the deflection angle of the first blade is fixed. The faster the rotor speed, the greater the deflection angle of the second blade, increasing the angle between the second blade and the airflow direction, increasing the thrust of the airflow on the impeller and the corresponding increase in airflow volume, thus achieving adaptive airflow regulation. However, excessive deflection of the second blade can cause flow separation or backflow, which in turn reduces airflow. Therefore, springs are added on both sides of the second blade. The maximum compression of the springs is adapted to the maximum deflection angle of the second blade, and the springs can also push the second blade back into position. It has the advantages of simple structure, compact fit and reasonable design; therefore, it is a product with superior performance both technically and economically.

Brief Description of the Drawings

[0009] In the present invention, unless otherwise specified or limited, the terms "assemble," "connect," and "connect" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection; direct connection, connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0010] The following description of the embodiments of the present invention is provided in conjunction with the accompanying drawings to further describe the specific embodiments of the present invention so that the technical solutions and beneficial effects of the present invention will be more clearly understood. The following description of the embodiments with reference to the accompanying drawings is illustrative and intended to explain the present invention, but is not to be construed as limiting the present invention.

[0011] The preferred embodiment provided by the present invention is as follows: Figures 1 to 5 As shown, a heat dissipation impeller for a brushless motor includes a housing 1, a rotor 2 and a heat dissipation impeller 3; the housing 1 and the rotor 2 adopt the existing brushless motor rotation method, and the specific structure of the stator and rotor 2 in the housing 1 is not repeated here.

[0012] The housing 1 has a cavity, the wall of which is ringed with a stator. Both ends of the housing 1 are provided with heat dissipation holes 11 to allow air to enter the cavity from outside the housing 1 to form an airflow circulation. The heat dissipation impeller 3 includes a ring body 31 and blades 32. The blades 32 are arranged around the outside of the ring body 31. The ring body 31 and the blades 32 are an integrated structure. The ring body 31 has a through hole 33 that passes through the ring body 31 for the rotor 2 to pass through. An elastic clamping column 34 is provided in the through hole 33. The blade 32 includes a primary blade 321 and a second blade 322. The primary blade 321 is provided with a groove 323. Both ends of the groove 323 are provided with shaft holes 324. Column shafts 325 extend from both ends of the second blade 322. The column shaft 325 is connected to the shaft hole 324 so that the second blade 322 is hinged to the groove 323. There are avoidance spaces 326 on both sides of the second blade 322 and the wall of the groove 323. A spring 327 is provided in the avoidance space, and both ends of the spring 327 are respectively fixed to the second blade 322 and the wall of the groove 323. When the heat dissipation impeller rotates, the second blade 322 deflects relative to the first blade 32 under the action of centrifugal force. As the speed of the heat dissipation impeller increases, the deflection angle of the second blade 322 changes accordingly. The springs 327 on both sides of the second blade 322 cooperate to adjust the deflection angle of the second blade 322.

[0013] The rotor 2 has a socket 21 at each end. The rotor 2 passes through the through hole 33, allowing the elastic clamping column 34 to move to the socket 21 position. The elastic clamping column 34 is connected to the socket 21 to fix the heat dissipation impeller 3 to the rotor 2, so that the heat dissipation impeller 3 rotates with the rotor 2. The heat dissipation impeller 3 at both ends of the rotor 2 is located in the cavity.

[0014] A cavity 36 is defined within the through-hole 33, and an elastic post 34 is positioned within the cavity 36. A spring 35 is positioned within the cavity 36, with its ends secured to the post 34 and the wall of the cavity 36, respectively. The spring 35 allows the post 34 to move within the cavity 36. The post 34 is provided with an inclined surface 37, allowing the shaft of the rotor 2 to smoothly push the post 34 in when the cooling impeller 3 is inserted into the rotor 2. The length of the post 34 is greater than the depth of the insertion hole 21, ensuring that the post 34 abuts both the ring body 31 and the rotor 2, allowing the rotor 2 and the cooling impeller 3 to rotate simultaneously.

[0015] The blades 32 of the heat dissipation impellers 3 at both ends are arranged in opposite directions, so that the blades 32 at one end rotate to produce a suction effect, and the blades 32 at the other end rotate to produce a discharge effect, which greatly improves the heat dissipation effect.

[0016] This brushless motor features an inner rotor. Its cooling impeller 32 utilizes an elastic snap-fit ​​mechanism. The rotor 2 is inserted into the through-hole 33, and the cooling impeller 3 moves along the rotor 2, allowing the elastic snap-fit ​​posts 34 to engage with the sockets 21. This secures the cooling impeller 3 to the rotor 2, allowing both impellers 3 and rotor 2 to rotate together. The cooling impellers 3 are mounted at opposite ends of the rotor 2. Because the blades 32 of the two cooling impellers 3 are positioned oppositely, the cooling impeller 3 at one end creates an inlet airflow while the other creates an outlet airflow, significantly improving heat dissipation. Furthermore, the heat dissipation impeller adopts a two-stage blade structure, and the second blade can be deflected relative to the first blade, so the second blade is in an active state. The heat dissipation impeller rotates with the rotor, and the deflection angle of the first blade is fixed. The faster the rotor speed, the larger the deflection angle of the second blade, the larger the angle between the second blade and the airflow direction, the thrust of the airflow on the impeller increases, and the air volume increases accordingly, thereby realizing adaptive adjustment of the air volume; but since excessive deflection of the second blade may cause flow separation or backflow, which in turn reduces the air volume, springs are added on both sides of the second blade, and the maximum compression of the spring adapts to the maximum deflection angle of the second blade. At the same time, the spring can also push the second blade to reset.

[0017] In the description of the specification, reference to the terms "one embodiment," "preferably," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. The schematic expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0018] Through the description of the above structure and principle, technical personnel in the relevant technical field should understand that the present invention is not limited to the above specific implementation methods, and improvements and substitutions based on the present invention using the well-known technology in the field all fall within the scope of protection of the present invention and should be defined by the claims.

Claims

1. A heat dissipation impeller for a brushless motor, characterized in that: The heat dissipation impeller includes a ring body and blades. The blades are arranged around the outside of the ring body. The ring body and the blades are an integrated structure. The ring body has a through hole that passes through the ring body for the rotor to pass through. An elastic clamping column is provided in the through hole. The blades include a primary blade and a second blade. The primary blade is provided with a groove, and shaft holes are provided at both ends of the groove. Column shafts extend from both ends of the second blade, and the column shafts are connected to the shaft holes so that the second blade is hinged to the groove. There are avoidance spaces on both sides of the second blade and the wall of the groove; a spring is provided in the avoidance space, and both ends of the spring are respectively fixed to the second blade and the wall of the groove; when the heat dissipation impeller rotates, the second blade deflects relative to the first blade under the action of centrifugal force, and as the speed of the heat dissipation impeller increases, the deflection angle of the second blade changes accordingly, and the springs on both sides of the second blade cooperate to adjust the deflection angle of the second blade.

2. The heat dissipation impeller for a brushless motor according to claim 1, characterized in that: The heat dissipation impeller is installed on the rotor of the brushless motor. The rotor is equipped with a shell. The shell has a cavity. The wall of the cavity is surrounded by a stator. Heat dissipation holes are provided at both ends of the shell to allow air to enter the cavity from outside the shell to form an air circulation.

3. The heat dissipation impeller for a brushless motor according to claim 2, characterized in that: There are sockets at both ends of the rotor. The rotor passes through the through holes to move the elastic clamping column to the socket position. The elastic clamping column is connected to the socket to fix the heat dissipation impeller on the rotor, so that the heat dissipation impeller rotates with the rotor.

4. The heat dissipation impeller for a brushless motor according to claim 3, characterized in that: A cavity is provided in the through hole, an elastic clamping column is placed in the cavity, a spring is provided in the cavity, two ends of the spring are respectively fixed to the elastic clamping column and the cavity wall, and the elastic clamping column moves in the cavity under the cooperation of the spring.

5. The heat dissipation impeller for a brushless motor according to claim 4, characterized in that: The elastic clamping column is provided with an inclined surface.

6. The heat dissipation impeller for a brushless motor according to claim 5, characterized in that: The length of the elastic clamping column is greater than the depth of the insertion hole.

7. The heat dissipation impeller for a brushless motor according to claim 6, characterized in that: The heat dissipation impellers at both ends of the rotor are located in the cavity.

8. The heat dissipation impeller for a brushless motor according to claim 7, characterized in that: The blades of the heat dissipation impellers at both ends are arranged in opposite directions.

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