High-steady-state connecting structure of inner impeller of brushless motor

Abstract

The utility model relates to a high steady state connecting structure of an inner impeller of a brushless motor, which comprises a rotor and an inner impeller which are connected with each other, the rotor comprises a rotor core and a rotating shaft, the inner impeller is sleeved on the rotating shaft at one end of the rotor core, a bottom cover is arranged between the inner impeller and the rotor core, and the bottom cover is also sleeved on the rotating shaft. A large number of protruding teeth which are scattered and evenly distributed in the circumferential direction are arranged on the face, facing the rotor iron core, of the bottom cover, the protruding teeth abut against the end face of one end of the rotor iron core, a protruding ring is coaxially arranged on the face, facing the inner impeller, of the bottom cover, the protruding ring protrudes towards the inner impeller, and the inner impeller comprises an impeller base and a large number of blades which are evenly distributed on the periphery of the impeller base in the circumferential direction. An annular groove tightly matched with the protruding ring is formed in the end face of the end, opposite to the bottom cover, of the wheel base, and the protruding ring is clamped in the annular groove. According to the utility model, the technical problem that the inner impeller slips relative to the rotating shaft in the starting process of the motor is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a high-steady-state connection structure for an inner impeller of a brushless motor. Background Art

[0002] The inner impeller of the existing brushless inner-rotor motor is directly sleeved on the rotating shaft. Due to the large temperature difference between when the motor is working and when it stops, and the conventional inner impeller is mainly made of plastic material or other polymer materials, in a working environment with frequent temperature changes, the aging of the inner impeller will be accelerated, resulting in a decrease in the connection strength between the inner impeller and the rotating shaft, and the phenomenon of slipping between the inner impeller and the rotating shaft occurs, reducing the heat dissipation effect of the inner impeller and affecting the service life of the motor.

[0003] In addition, when the motor starts, when the rotating shaft directly drives the wheel seat of the inner impeller, a large torque needs to be provided, which further makes the rotating shaft and the wheel seat prone to slipping when the motor starts. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is: to provide a high-steady-state connection structure for an inner impeller of a brushless motor, and solve the technical problem of slipping between the inner impeller and the rotating shaft during the starting process of the motor.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is: a high-steady-state connection structure for an inner impeller of a brushless motor, including a rotor and an inner impeller connected to each other. The rotor includes a rotor core and a rotating shaft. The inner impeller is sleeved on the rotating shaft at one end of the rotor core. A bottom cover is further arranged between the inner impeller and the rotor core, and the bottom cover is also sleeved on the rotating shaft. A large number of circumferentially discrete and evenly distributed convex teeth are arranged on the surface of the bottom cover facing the rotor core, and the convex teeth are in tight contact with one end face of the rotor core. A convex ring is coaxially arranged on the surface of the bottom cover facing the inner impeller, and the convex ring protrudes towards the inner impeller. The inner impeller includes a wheel seat and a large number of blades circumferentially distributed around the periphery of the wheel seat. An annular groove tightly fitted with the convex ring is formed on the end face of the wheel seat opposite to the bottom cover, and the convex ring is clamped in the annular groove.

[0006] As a preferred scheme, the top surface of the convex teeth is a plane, the top surfaces of all convex teeth are in the same plane and perpendicular to the axial direction of the rotating shaft, and the convex teeth are circumferentially evenly distributed on the outer edge of the bottom cover.

[0007] As a preferred scheme, the bottom cover is annular, and the inner diameter of the central hole of the bottom cover is larger than the diameter of the rotating shaft.

[0008] As a preferred scheme, an annular wing plate extends radially outwards at one end of the wheel seat of the inner impeller away from the bottom cover, and the blades are all connected to the surface of the annular wing plate facing the rotor core.

[0009] As a preferred solution, one end of the rotor core facing away from the bottom cover is connected with a top cover, the top cover is sleeved on the rotating shaft, and the facing surfaces of the top cover and the rotor core are in mutual contact.

[0010] The beneficial effects of the present utility model are as follows: The present utility model utilizes the circumferentially evenly distributed convex teeth on the bottom cover to abut against the rotor core, and then utilizes the convex ring to connect with the annular groove on the inner impeller, so that the kinetic energy of the rotor core can be directly transmitted to the inner impeller. Since the inner diameter of the convex ring is much larger than the diameter of the rotating shaft, the torque required to drive the inner impeller to rotate can be much smaller. While the convex ring drives the inner impeller to rotate, the torque applied by the rotating shaft on the inner impeller can be greatly reduced, thus effectively avoiding the sliding between the inner impeller and the rotating shaft and improving the stability of the inner impeller during rotation. Description of the Drawings

[0011] The following further details the specific embodiments of the present utility model in conjunction with the drawings, where:

[0012] Figure 1 is the exploded perspective view of the three-dimensional structure of the present utility model;

[0013] Figure 1 In the figure: 1. Rotor; 101. Rotor core; 102. Rotating shaft; 2. Inner impeller; 201. Wheel seat; 202. Blades; 203. Annular wing plate; 3. Bottom cover; 4. Convex teeth; 5. Convex ring; 6. Annular groove; 7. Top cover; 8. Permanent magnet. Specific Embodiments

[0014] The following further details the specific implementation solutions of the present utility model in conjunction with the drawings.

[0015] A high-steady-state connection structure for the inner impeller of a brushless motor, comprising a rotor 1 and an inner impeller 2 connected to each other. The rotor 1 includes a rotor core 101 and a rotating shaft 1. The inner impeller 2 is sleeved on the rotating shaft 102 at one end of the rotor core 101. A bottom cover 3 is further provided between the inner impeller 2 and the rotor core 101, and the bottom cover 3 is also sleeved on the rotating shaft 102. A large number of circumferentially discretely and evenly distributed convex teeth 4 are provided on the surface of the bottom cover 3 facing the rotor core 101, and the convex teeth 4 tightly abut against one end face of the rotor core 101. A convex ring 5 is coaxially provided on the surface of the bottom cover 3 facing the inner impeller 2, and the convex ring 5 protrudes towards the inner impeller 2. The inner impeller 2 includes a wheel seat 201 and a large number of blades 202 circumferentially evenly distributed on the periphery of the wheel seat 201. An annular groove 6 tightly fitted with the convex ring 5 is provided on the end face of the wheel seat 201 opposite to the bottom cover 3, and the convex ring 5 is clamped in the annular groove 6.

[0016] The circumferentially evenly distributed convex teeth 4 on the bottom cover 3 are in contact with the rotor core 101, and the convex ring 5 is connected to the annular groove 6 on the inner impeller 2. In this way, the kinetic energy of the rotor core 101 can be directly transmitted to the inner impeller 2. Since the inner diameter of the convex ring 5 is much larger than the diameter of the rotating shaft 102, the torque required to drive the inner impeller 2 to rotate can be much smaller. While the convex ring 5 drives the inner impeller 2 to rotate, the torque applied by the rotating shaft 102 on the inner impeller 2 can be greatly reduced, so that the sliding between the inner impeller 2 and the rotating shaft 102 can be effectively avoided.

[0017] The contact of the convex teeth 4 with the rotor core 101 is beneficial to increasing the friction force between the bottom cover 3 and the rotor core 101 and eliminating the sliding friction between the rotor core 101 and the bottom cover 3.

[0018] In practical applications, the hardness of the bottom cover 3 can be slightly lower than that of the inner impeller 2, which can play a buffering role and further improve the stability of the inner impeller 2 during startup and rotation.

[0019] In this embodiment, the top surface of the convex teeth 4 is a plane, which will not damage the end face of the rotor core 101. The top surfaces of all the convex teeth 4 are in the same plane and perpendicular to the axial direction of the rotating shaft 102 to ensure that the bottom cover 3 can be stably attached to the end face of the rotor core 101. The convex teeth 4 are circumferentially evenly distributed on the outer edge of the bottom cover 3, so that the rotor core 101 can drive the bottom cover 3 to rotate more easily.

[0020] In this embodiment, the bottom cover 3 is annular, and the inner diameter of the central hole of the bottom cover 3 is larger than the diameter of the rotating shaft 102. In practical applications, the bottom cover 3 can also be square.

[0021] In this embodiment, at one end of the wheel seat 201 of the inner impeller 2 away from the bottom cover 3, a ring-shaped wing plate 203 extends radially outward, and the blades 202 are all connected to the side of the ring-shaped wing plate 203 facing the rotor core 101. The setting of the wing plate can make the airflow formed by the rotation of the inner impeller flow spirally along the outer circumferential wall of the rotor core 101.

[0022] In this embodiment, a top cover 7 is also connected to the end of the rotor core 101 facing away from the bottom cover 3. The top cover 7 is sleeved on the rotating shaft 102, and the opposite surfaces of the top cover 7 and the rotor core 101 are in contact with each other. The bottom cover 3 can not only be used to drive the inner impeller 2, but also has the function of blocking the magnetic steel 8 inside the rotor core 101. Therefore, the corresponding top cover 7 is provided to block the other end of the rotor core 101 to prevent the magnetic steel 8 from coming out of the other end of the rotor core 101.

[0023] The working process of the present utility model is as follows: After the high-steady connection structure of the impeller in the brushless motor of the present utility model is installed with the stator coil, the motor housing, etc., the motor is then started. Under the action of the continuously changing magnetic field of the stator coil, the rotor core 101 rotates under the magnetic force, and at the same time drives the rotating shaft 102 and the bottom cover 3. The bottom cover 3 drives the inner impeller 2 to rotate by means of the convex ring 5, and at the same time also drives the inner impeller 2 to rotate by means of the rotating shaft 102. In this way, the torsion between the rotating shaft 102 and the inner impeller 2 is greatly reduced, so that the inner impeller 2 will not have circumferential sliding with the rotating shaft 102. Thus, the technical problem that the inner impeller slips with the rotating shaft during the motor startup process is solved.

[0024] The above embodiments only illustrate the principle and efficacy of the present invention and some applied embodiments, rather than limiting the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. High-steady connection structure of an impeller inside a brushless motor, comprising a rotor (1) and an inner impeller (2) which are connected to each other, characterized in that, The rotor (1) includes a rotor core (101) and a rotating shaft (102). The inner impeller (2) is sleeved on the rotating shaft (102) at one end of the rotor core (101). A bottom cover (3) is further provided between the inner impeller (2) and the rotor core (101), and the bottom cover (3) is also sleeved on the rotating shaft (102). A large number of circumferentially discrete and evenly distributed convex teeth (4) are provided on the surface of the bottom cover (3) facing the rotor core (101), and the convex teeth (4) are in tight contact with one end face of the rotor core (101). A convex ring (5) is coaxially provided on the surface of the bottom cover (3) facing the inner impeller (2), and the convex ring (5) protrudes towards the inner impeller (2). The inner impeller (2) includes a wheel seat (201) and a large number of blades (202) circumferentially distributed around the periphery of the wheel seat (201). An annular groove (6) tightly fitted with the convex ring (5) is formed on the end face of the wheel seat (201) opposite to the bottom cover (3), and the convex ring (5) is clamped in the annular groove (6).

2. The high-steady connection structure of the inner impeller of the brushless motor according to claim 1, characterized in that The top surface of the convex teeth (4) is a plane, and the top surfaces of all the convex teeth (4) are in the same plane and perpendicular to the axial direction of the rotating shaft (102). The convex teeth (4) are circumferentially evenly distributed on the outer edge of the bottom cover (3).

3. The high-steady connection structure of the inner impeller of the brushless motor according to claim 1, characterized in that, The bottom cover (3) is annular, and the inner diameter of the central hole of the bottom cover (3) is larger than the diameter of the rotating shaft (102).

4. The high-steady connection structure of the impeller inside the brushless motor according to claim 1, characterized in that, An annular wing plate (203) extends radially outwards from the end of the wheel seat (201) of the inner impeller (2) away from the bottom cover (3), and the blades (202) are all connected to the surface of the annular wing plate (203) facing the rotor core (101).

5. The high-steady connection structure of the inner impeller of the brushless motor according to claim 1, wherein A top cover (7) is connected to the end of the rotor core (101) facing away from the bottom cover (3), and the top cover (7) is sleeved on the rotating shaft (102). The facing surfaces of the top cover (7) and the rotor core (101) are in contact with each other.

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