A dust extractor motor

Abstract

The dust collector motor of the present application is provided with a rear fixed impeller and a front air cover outside the motor body, the air cover is provided with a movable impeller, the movable impeller is installed on the motor body, the motor body drives the movable impeller to rotate to suck the outside air into the air cover to generate air flow in the air cover, the fixed impeller is provided with three-dimensional spiral blades to guide the air flow, the fixed impeller has front and rear two stages with the same rotation direction, and the blade spiral angles of the two stages of fixed impellers are different. Since the blade spiral angles of the front and rear two stages of fixed impellers are different, the air flow will be disturbed to generate a rotational flow when passing through the junction of the front and rear two stages of fixed impellers, the rotational flow sweeps away the dust adhered on the fixed impeller blades, so the fixed impeller of the motor is not easy to accumulate dust.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a vacuum cleaner motor. Background Technology

[0002] A vacuum cleaner motor is a motor that generates airflow inside a vacuum cleaner, commonly used in devices with vacuuming functions, including robotic vacuum cleaners. A vacuum cleaner motor has a rear-mounted fixed impeller and a front-mounted fan shroud mounted on the outside of the motor body. Inside the fan shroud is a moving impeller, which is mounted on the motor body. The motor body drives the moving impeller to rotate, drawing outside air into the fan shroud to create airflow. The fixed impeller has three-dimensional spiral blades to guide the airflow, causing it to flow along a predetermined path. Because dust carried in the airflow easily adheres to the blades of the fixed impeller, it needs to be removed and cleaned periodically. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a vacuum cleaner motor whose impeller is not prone to dust accumulation.

[0004] To solve the above-mentioned technical problems, the present invention provides a vacuum cleaner motor, which has a rearward fixed impeller and a front shroud installed on the outside of the motor body. The shroud is equipped with a moving impeller, which is mounted on the motor body. The motor body drives the moving impeller to rotate, drawing outside air into the shroud and thus generating airflow inside the shroud. The fixed impeller has three-dimensional spiral blades to guide the airflow. The fixed impeller has two stages with the same direction of rotation, front and rear, and the blades of the two stages of the fixed impeller have different helical angles.

[0005] Furthermore, a cooling air duct is left between the front and rear impellers, leading to the inside of the motor body.

[0006] Furthermore, the heat dissipation duct specifically leads to the stator of the motor body.

[0007] Furthermore, the front impeller has a branch port at the front end of its wheel wall that leads to the heat dissipation duct.

[0008] Furthermore, there are multiple diversion outlets arranged circumferentially.

[0009] Furthermore, the impeller wall extends inward to form guide vanes for guiding airflow to the diversion port.

[0010] Because the blades of the front and rear impellers have different helical angles, the airflow will be disturbed when it passes through the junction of the front and rear impellers, thus generating a swirling flow. The swirling flow carries away the dust attached to the blades of the impellers, so the impellers of this motor are not prone to dust accumulation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a vacuum cleaner motor.

[0012] Figure 2 This is a cross-sectional schematic diagram of a vacuum cleaner motor.

[0013] Figure 3 yes Figure 2 A magnified view of a portion of the image, showing a larger area. Figure 2 Part A.

[0014] Figure 4 This is a schematic diagram of a two-stage fixed impeller.

[0015] Figure 5 This is a schematic diagram of the front-mounted fixed impeller.

[0016] Figure 6 yes Figure 5 A magnified view of a portion of the image, showing a larger area. Figure 5 Part B. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments.

[0018] Vacuum cleaner motor Figure 1 and Figure 2 It includes a motor body 1, and front and rear stator impellers 21 and 22, which are fixed together and mounted on the outside of the motor body 1. See Figure 2 and Figure 4 The two-stage fixed impellers 21 and 22 are equipped with three-dimensional spiral blades 211 and 221 with the same direction of rotation, but the helix angles of the blades are different. A fan shroud 3 is installed on the front fixed impeller 21, located in front of the fixed impeller 21 and also outside the motor body 1. A moving impeller 4 is installed inside the fan shroud 3, which is mounted on the drive shaft 11 of the motor body 1. The air inlet 30 of the fan shroud 3 is smaller than the air inlet 40 of the moving impeller 4. During operation, the drive shaft 11 of the motor body 1 drives the moving impeller 4 to rotate, drawing outside air backward into the fan shroud 3, thereby generating airflow inside the fan shroud 3. The blades 211 and 221 of the front and rear fixed impellers 21 and 22 guide the airflow, causing it to flow backward along a predetermined path. Because the blades of the front and rear impellers 21 and 22 have different helical angles, the airflow will be disturbed when it passes through the junction of the front and rear impellers 21 and 22, thus generating a swirling flow. The swirling flow carries away the dust adhering to the blades 211 and 221 of the impellers 21 and 22. Therefore, the impellers 21 and 22 of this motor are not prone to dust accumulation.

[0019] See 2 and Figure 3A cooling duct 20 is provided between the front and rear stage stator impellers 21 and 22. The cooling duct 20 leads to the stator 12 inside the motor body 1. Some airflow enters the cooling duct 20 at the junction of the front and rear stage stator impellers 21 and 22, then passes over the stator 20 of the motor body 1, carrying away heat from the stator 20 and thus cooling it. If the blade helix angles of the front and rear stage stator impellers 21 and 22 are the same, the airflow may have difficulty effectively entering the cooling duct 20 due to the single and smooth path. See [link / reference]. Figure 2 and Figure 4 Because the blades of the front and rear stator impellers 21 and 22 of the vacuum cleaner motor of the present invention have different helical angles, the airflow will be disturbed when passing through the junction of the front and rear stator impellers 21 and 22. This disturbance makes the airflow path more complex, which helps the airflow to enter the heat dissipation duct 20 better, thereby better cooling the stator 12 of the motor body 1. See Figure 3 and Figure 5 The front impeller 21 has a flow divider 215 at its front end, which leads to the heat dissipation duct 20. Figure 5 and Figure 6 The impeller 21 has guide vanes 216 extending inward from its inner wall, located at the flow divider 215. The flow divider 215 has multiple vanes arranged circumferentially, and the guide vanes 216 have correspondingly multiple vanes. See... Figure 2 and Figure 3 When some airflow flows along the blades 211 of the front stator impeller 21, it will enter the heat dissipation duct 20 from the diversion port 215 to dissipate heat for the stator 20 of the motor body 1. During this process, the guide vane 216 guides the airflow through the diversion port 215 to prevent the airflow from different diversion ports 215 from colliding with each other.

[0020] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection. Any non-substantial changes or substitutions made by those skilled in the art based on the present invention will still fall within the scope of patent protection.

Claims

1. A vacuum cleaner motor, comprising a rearward fixed impeller and a front shroud mounted on the outside of the motor body, wherein a movable impeller is provided inside the shroud and mounted on the motor body, the motor body drives the movable impeller to rotate to draw outside air into the shroud, thereby generating airflow within the shroud, and the fixed impeller is provided with three-dimensional spiral blades for airflow guidance, characterized in that: The impeller has two stages, front and rear, with the same direction of rotation, and the blades of the two stages have different helix angles. A heat dissipation duct is left between the front and rear stages of the impeller, leading to the inside of the motor body. The front impeller has a branch port at the front end of its wheel wall, leading to the heat dissipation duct. The wheel wall of the impeller extends inward with guide vanes to guide the airflow to the branch port.

2. The motor according to claim 1, characterized in that: The heat dissipation duct specifically leads to the stator of the motor body.

3. The motor according to claim 1, characterized in that: There are multiple diversion outlets, arranged circumferentially.

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