Fan assembly for robot vacuum cleaner and robot vacuum cleaner

1. A fan assembly for a robot vacuum cleaner, comprising an electric motor, a stator impeller, a rotor impeller and a fan cover; and wherein,

the stator impeller has a shaft hole, the electric motor being mounted on a first side of the stator impeller, and an output shaft of the electric motor passing through the shaft hole;

the fan cover is mounted on a second side of the stator impeller, an end surface of the fan cover defining an air inlet, the end surface being a surface of the fan cover away from the stator impeller; and

the rotor impeller is mounted to the output shaft of the electric motor and located between the fan cover and the stator impeller;

wherein the stator impeller comprises a front impeller disc, the front impeller disc comprising a round plate and a ring rim, the ring rim being disposed around a circumferential edge of the round plate and extending towards the electric motor; and, wherein the shaft hole is located in a center of the round plate;

the stator impeller further comprises a rear impeller disc, wherein the rear impeller disc comprises a bottom plate and a first protruding rim, the bottom plate defining a first round hole at a middle thereof, the first protruding rim being disposed on the bottom plate along a circumferential edge of the first round hole and extending towards the fan cover;

wherein the stator impeller further comprises a plurality of blades provided on upper surface of the rear impeller disc facing towards the rotor impeller and spaced from one another, the plurality of blades is fixed between the ring rim and the first protruding rim;

wherein the fan assembly further comprising a first fastener, the electric motor has a first mounting hole, the round plate has a second mounting hole corresponding to the first mounting hole, and the first fastener passes through the first mounting hole and the second mounting hole to fasten the electric motor to the side of the stator impeller.

2. The fan assembly according to claim 1 , wherein the fan cover has a shape matching the rotor impeller, the air inlet is circular, and a ratio of a diameter of the air inlet to a diameter of the fan cover or the rotor impeller ranges from 1/5 to 4/5.

3. The fan assembly according to claim 2 , wherein the ratio of the diameter of the air inlet to the diameter of the fan cover is 2/5.

4. The fan assembly according to claim 2 , wherein the fan cover has a cylindrical shape.

5. The fan assembly according to claim 1 , wherein the fan cover is fitted over an outside of the first protruding rim, and the fan cover is in interference fit with the first protruding rim.

6. The fan assembly according to claim 1 , further comprising a support seat and a second fastener, the stator impeller being mounted on the support seat, wherein

the support seat comprises a base plate and a first leg, the base plate defining a second round hole at a middle thereof, and the base plate being provided with the first legs at two ends of the second round hole along a radial direction of the second round hole respectively; and

the rear impeller disc further comprising two second legs provided at two ends of the first round hole along a radial direction of the first round hole respectively, the second fastener passing through the first leg and the second leg to fasten the stator impeller to the support seat.

7. The fan assembly according to claim 6 , wherein the first leg is provided with a bump, the second leg defines a groove matching the bump, and the bump extends into the groove.

8. The fan assembly according to claim 6 , wherein the rear impeller disc further comprises a second protruding rim, the second protruding rim is disposed on the bottom plate along the circumferential edge of the first round hole and extends towards the electric motor; and

the base plate defines an annular groove matching the second protruding rim along a circumferential edge of the second round hole, and the second protruding rim is snapped into the annular groove.

9. A robot vacuum cleaner, comprising a fan assembly for a robot vacuum cleaner, the fan assembly comprising an electric motor, a stator impeller, a rotor impeller and a fan cover; and wherein,

the stator impeller has a shaft hole, the electric motor being mounted on a first side of the stator impeller, and an output shaft of the electric motor passing through the shaft hole;

the fan cover is mounted on a second side of the stator impeller, an end surface of the fan cover defining an air inlet, the end surface being a surface of the fan cover away from the stator impeller; and

the rotor impeller is mounted to the output shaft of the electric motor and located between the fan cover and the stator impeller;

wherein the stator impeller comprises a front impeller disc, the front impeller disc comprising a round plate and a ring rim, the ring rim being disposed around a circumferential edge of the round plate and extending towards the electric motor; and, wherein the shaft hole is located in a center of the round plate;

the stator impeller further comprises a rear impeller disc, wherein the rear impeller disc comprises a bottom plate and a first protruding rim, the bottom plate defining a first round hole at a middle thereof, the first protruding rim being disposed on the bottom plate along a circumferential edge of the first round hole and extending towards the fan cover;

wherein the stator impeller further comprises a plurality of blades provided on upper surface of the rear impeller disc facing towards the rotor impeller and spaced from one another, the plurality of blades is fixed between the ring rim and the first protruding rim;

wherein the robot vacuum cleaner further comprising a first fastener, the electric motor has a first mounting hole, the round plate has a second mounting hole corresponding to the first mounting hole, and the first fastener passes through the first mounting hole and the second mounting hole to fasten the electric motor to the side of the stator impeller.

10. The robot vacuum cleaner according to claim 9 , wherein the fan cover has a shape matching the rotor impeller, the air inlet is circular, and a ratio of a diameter of the air inlet to a diameter of the fan cover or the rotor impeller ranges from 1/5 to 4/5.

11. The robot vacuum cleaner according to claim 10 , wherein the ratio of the diameter of the air inlet to the diameter of the fan cover is 2/5.

12. The robot vacuum cleaner according to claim 9 , wherein the fan cover is fitted over an outside of the first protruding rim, and the fan cover is in interference fit with the first protruding rim.

13. The robot vacuum cleaner according to claim 9 , further comprising a support seat and a second fastener, the stator impeller being mounted on the support seat, wherein

the support seat comprises a base plate and a first leg, the base plate defining a second round hole at a middle thereof, and the base plate being provided with the first legs at two ends of the second round hole along a radial direction of the second round hole respectively; and

the rear impeller disc further comprising two second legs provided at two ends of the first round hole along a radial direction of the first round hole respectively, the second fastener passing through the first leg and the second leg to fasten the stator impeller to the support seat.

14. The robot vacuum cleaner according to claim 13 , wherein the first leg is provided with a bump, the second leg defines a groove matching the bump, and the bump extends into the groove.