An outer rotor motor applied to a dust collector

Abstract

The application relates to an outer rotor motor applied to a dust collector, which comprises a tubular stator assembly located at the center and a rotor assembly sleeved outside the stator assembly, characterized in that the stator assembly is fixedly sleeved on a central pipe, the front end of the central pipe extends out of the stator assembly and extends radially outward to form a ring-shaped front end plate, the rear end of the central pipe is rotationally connected with a rear end plate, the rear end plate is provided with a ventilation hole coaxial with the inner hole of the central pipe, the front end of the rotor assembly is rotationally connected with the front end plate, and the rear end is fixedly connected with the rear end plate, a large number of obliquely arranged blades are uniformly distributed on the rear end surface of the rear end plate around the ventilation hole, and the far ends of all the blades from the rear end plate are jointly connected with a baffle, and the baffle, the blades and the rear end plate jointly form a centrifugal impeller. The application can reduce the air flow resistance, improve the suction power of the dust collector, and reduce the motor energy consumption.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric machines, and particularly relates to an outer rotor electric machine applied to a dust collector. BACKGROUND

[0002] At present, the electric machine of the dust collector usually adopts an inner rotor brushless electric machine, but when the inner rotor brushless electric machine is connected with the centrifugal blade, the centrifugal impeller can only be arranged at the front end of the electric machine. In order to simultaneously realize the cooling of the electric machine, the front-end structure of the centrifugal impeller makes the airflow output by the centrifugal impeller pass through the electric machine and then be discharged from the main shell of the dust collector. This makes the airflow at least change direction twice in the main shell of the dust collector, and the airflow needs to overcome the wind resistance of the internal structure of the electric machine, so that the airflow resistance is increased, the suction power of the dust collector is limited, and the power consumption of the electric machine is also increased. SUMMARY

[0003] The technical problem to be solved by the application is to provide an outer rotor electric machine applied to a dust collector, so as to solve the problem that the centrifugal impeller can only be arranged at the front end when the traditional inner rotor electric machine is connected with the centrifugal impeller, which results in large airflow circulation resistance, limits the suction power of the dust collector, and increases the power consumption of the electric machine.

[0004] To solve the above technical problem, the application adopts the following technical scheme: an outer rotor electric machine applied to a dust collector, comprising a tubular stator assembly located at the center and a rotor assembly sleeved outside the stator assembly, characterized in that the stator assembly is fixedly sleeved on a central pipe, the front end of the central pipe extends out of the stator assembly and extends radially outward to form a ring-shaped front end plate, the rear end of the central pipe is rotationally connected with a rear end plate, the rear end plate is provided with a ventilation hole coaxial with the inner hole of the central pipe, the front end of the rotor assembly is rotationally connected with the front end plate, and the rear end is fixedly connected with the rear end plate, a large number of inclined blades are uniformly distributed around the ventilation hole on the rear end surface of the rear end plate, and the distal ends of all the blades are connected with a baffle plate.

[0005] As a preferred scheme, an external thread is arranged on the rear end outer wall of the central pipe, the external thread is located behind the stator assembly, a sleeve ring is sleeved on the central pipe, an internal thread matched with the external thread is arranged on the inner wall of the rear part of the sleeve ring, the front part of the sleeve ring is gap-fitted with the central pipe, and the axial length of the front part of the sleeve ring is greater than the distance between the stator assembly and the external thread.

[0006] As a preferred scheme, a positioning ring coaxial with the central pipe is fixedly arranged on the front end surface of the rear end plate, the positioning ring surrounds the outer wall of the central pipe and is rotationally connected with the central pipe through a rear end bearing, and the rear end bearing is arranged between the sleeve ring and the rear end plate.

[0007] As a preferred scheme, the rotor assembly comprises a cylindrical metal shell and a plurality of magnetic tiles which are sequentially attached to the inner wall of the shell in the circumferential direction, the front end of the front end plate is retracted rearward to form an annular step, a front end bearing is sleeved on the step, the shell is integrally formed with an annular front positioning plate at the front end, the front positioning plate is located in front of the step and abuts against the front end bearing, and the rotor assembly is rotationally connected with the front baffle through the front end bearing.

[0008] As a preferred scheme, the rear end of the shell is fixedly connected with the rear end plate through bolts.

[0009] As a preferred scheme, the stator assembly comprises an outer-tooth type stator core fixedly sleeved on the central pipe, two skeletons and a plurality of windings wound on the outer teeth of the stator core, the two skeletons are respectively arranged at the two ends of the stator core and abut against the two ends of the stator core, a plurality of wire holes and a plurality of internal thread holes are formed in the front end plate, and the internal thread holes extend from the front end of the front end plate to the rear end.

[0010] The beneficial effects of the present application are: the structure of the brushless outer rotor motor is improved, the stator assembly is fixedly sleeved on a central pipe, the rear end of the rotor assembly is connected with a rear end plate provided with a ventilation hole, the blade and the baffle are connected on the rear end plate, and the centrifugal impeller located at the rear end of the rotor assembly is formed, so that the rear structure of the centrifugal impeller is realized, the rear end of the outer rotor motor of the present application is integrated with the centrifugal impeller, during use, the rotor assembly rotates at high speed under the driving of the changing magnetic field of the stator assembly, drives the blade at the rear end to rotate at high speed, forms a gas flow flowing from the front end to the rear end of the central pipe, the gas flow first flows through the central pipe to cool the stator assembly, and then flows out along the radial direction of the centrifugal impeller, the high-speed gas flow flow process is almost not hindered, and after flowing out of the centrifugal impeller, the direction of the gas flow does not need to be changed again, so that the gas flow resistance is further reduced, and finally the outer rotor motor of the present application can reduce the air flow resistance, reduce the motor energy consumption and reduce the wind noise. BRIEF DESCRIPTION OF DRAWINGS

[0011] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings, in which:

[0012] Figure 1 is a half-section structure schematic diagram of the present application;

[0013] Figure 11. Stator assembly, 101. Stator core, 102. Skeleton, 103. Winding, 2. Rotor assembly, 201. Shell, 202. Magnetic tile, 203. Front locating plate, 3. Center tube, 4. Front end plate, 5. Rear end plate, 6. Vent hole, 7. Blade, 8. Baffle, 9. External thread, 10. Collar, 11. Internal thread, 12. Locating ring, 13. Rear end bearing, 14. Step, 15. Front end bearing, 16. Bolt, 17. Wire hole, 18. Bolt hole. DETAILED DESCRIPTION

[0014] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0015] As Figure 1 shown in a kind of outer rotor motor applied to dust catcher, including the tubular stator assembly 1 in center and the rotor assembly 2 of setting in the stator assembly 1 outside, the stator assembly 1 fixedly sleeve joint on a center tube 3, the front end of center tube 3 is stretched out outside stator assembly 1 and is extended to form annular front end plate 4 radially outward, the rear end of center tube 3 is rotatably connected with a rear end plate 5, and the rear end plate 5 is provided with vent hole 6 coaxial with the inner hole of center tube 3, the front end of rotor assembly 2 is rotatably connected with front end plate 4, and the rear end is fixedly connected with rear end plate 5, a large number of obliquely arranged blades 7 are evenly distributed on the rear end surface of rear end plate 5 around vent hole 6, and the ends of all blades 7 away from rear end plate 5 are commonly connected to a baffle 8, and the baffle 8, blades 7 and rear end plate 5 jointly form a centrifugal impeller.

[0016] In the embodiment, the rear end outer wall of center tube 3 is provided with external thread 9, the external thread 9 is located behind the stator assembly 1, a collar 10 is sleeved on the center tube 3, the inner wall of rear part of the collar 10 is provided with internal thread 11 matched with the external thread 9, the front part of the collar 10 is gap-fitted with the center tube 3, and the axial length of the front part of the collar 10 is greater than the distance between the stator assembly 1 and the external thread 9. A locating ring 12 coaxial with the center tube 3 is fixedly arranged on the front end surface of rear end plate 5, the locating ring 12 is wrapped around the outside of center tube 3 and is rotatably connected with the center tube 3 through rear end bearing 13, and the rear end bearing 13 is arranged between the collar 10 and the rear end plate 5. The collar 10 can be used to abut against the stator assembly 1 and can also be used to position the rear end bearing 13. The cooperation of the locating ring 12 and the rear end bearing 13 is used to improve the rotational stability of the rotor assembly 2.

[0017] In the embodiment, the rotor assembly 2 comprises a cylindrical metal shell 201 and a plurality of magnetic tiles 202 which are sequentially attached to the inner wall of the shell 201 in the circumferential direction, and the adjacent magnetic tiles 202 preferably abut each other. The front end of the front end plate 4 is retracted rearward to form an annular step 14, and the front end bearing 15 is sleeved on the step 14. The shell 201 is integrally formed with an annular front positioning plate 203 at the front end, and the front positioning plate 203 is located in front of the step 14 and abuts against the front end bearing 15. The rotor assembly 2 is rotationally connected with the front end plate 4 through the front end bearing 15. The front positioning plate 203 and the rear end plate 5 jointly limit the axial movement of the rotor assembly 2 along the central pipe 3, thereby improving the stability of the rotor assembly 2 during rotation.

[0018] The rear end of the shell 201 is fixedly connected with the rear end plate 5 through the bolts 16. Different specifications of the rear end plate 5 and the blades 7 connected to the rear end plate 5 can be replaced according to needs, so as to change the air suction volume of the outer rotor motor.

[0019] The stator assembly 1 in the embodiment comprises an outer tooth type stator core 101 fixedly sleeved on the central pipe 3, two skeletons 102 respectively arranged at the two ends of the stator core 101 and abutting against the two ends of the stator core 101, and a plurality of windings 103 wound on the outer teeth of the stator core 101. A plurality of wire passing holes 17 are formed in the front end plate 4 for the wire terminals to pass out, and a plurality of internal thread holes 18 are also arranged on the front end plate 4 and extend from the front end of the front end plate 4 to the rear end for connection with the support in the dust collector through fasteners.

[0020] The working process of the outer rotor motor applied to the dust collector is as follows: Figure 1 As shown in the outer rotor motor applied to the dust collector, in use, the motor is installed in the dust collector, the front end plate 4 is fixedly connected to the internal support of the dust collector through the bolts matched with the internal thread holes 18, and the central pipe 3 is communicated with the internal air duct of the dust collector. Then, the wire terminals protruding out of the wire passing holes 17 are connected with the circuit of the dust collector, and the air outlet hole opposite to the blades is formed on the dust collector. In this way, when the motor is started, the rotor assembly 2 drives the rear end plate 5 and the blades 7 to rotate at high speed, the rotation of the blades 7 drives the air inside the blades 7 to rotate at high speed and flow outward under the centrifugal force, so that the center of the annularly arranged blades 7 forms a negative pressure, and the internal air duct of the dust collector forms a high-speed airflow flowing to the central pipe 3, thereby forming a negative pressure at the dust suction port of the dust collector to absorb dust.

[0021] The air flowing into the center tube 3 from the internal air duct of the vacuum cleaner is normal temperature air, which is low in temperature, and thus cools the center tube 3 when passing through the center tube 3. The center tube 3 is fixedly connected to the stator assembly 1 and closely adheres to the stator assembly 1, and thus further reduces the working temperature of the stator assembly 1, prolonging the service life of the motor. After passing through the center tube 3, the air flow enters the center of the ring formed by the blades 7, and flows along the radial direction of the center tube 3 outward under the action of centrifugal force, and is directly discharged out of the vacuum cleaner through the air outlet hole on the vacuum cleaner.

[0022] After the outer rotor motor is used, the air flow is not substantially blocked in the entire air flow process, and thus the air flow resistance is greatly reduced, the suction force of the vacuum cleaner is further improved, and the motor energy consumption and the noise of the vacuum cleaner are reduced.

[0023] The above embodiments only exemplarily illustrate the principles and effects of the present application, and part of the applied embodiments, and are not used to limit the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. An external rotor motor for use in a vacuum cleaner, comprising a tubular stator assembly (1) located at the center and a rotor assembly (2) sleeved outside the stator assembly (1), characterized in that, The stator assembly (1) is fixedly sleeved on a central tube (3). The front end of the central tube (3) extends out of the stator assembly (1) and radially outward to form an annular front end plate (4). The rear end of the central tube (3) is rotatably connected to a rear end plate (5). The rear end plate (5) has ventilation holes (6) coaxial with the inner hole of the central tube (3). The front end of the rotor assembly (2) is rotatably connected to the front end plate (4), and the rear end is fixedly connected to the rear end plate (5). A large number of inclined blades (7) are evenly distributed around the ventilation holes (6) on the rear end surface of the rear end plate (5). All blades (7) The end away from the rear end plate (5) is connected to a baffle (8). The baffle (8), blade (7) and rear end plate (5) together form a centrifugal impeller. The rotor assembly is driven by the constantly changing magnetic field of the stator assembly to rotate at high speed, which drives the blade at the rear end to rotate at high speed, so that a negative pressure is formed inside the central tube, forming an airflow from the front end of the central tube to the rear end. The airflow first flows through the central tube to cool the stator assembly, and then passes through the blades and is discharged outward along the radial direction of the centrifugal impeller. The high-speed airflow process is almost unimpeded, and after flowing out of the centrifugal impeller, it does not need to change its direction again. An external thread (9) is provided on the outer wall of the rear end of the central tube (3). The external thread (9) is located behind the stator assembly (1). A collar (10) is fitted on the central tube (3). An internal thread (11) that mates with the external thread (9) is provided on the inner wall of the rear part of the collar (10). The front part of the collar (10) is in clearance fit with the central tube (3). The axial length of the front part of the collar (10) is greater than the distance between the stator assembly (1) and the external thread (9). The rotor assembly (2) includes a cylindrical metal shell (201) and multiple magnetic tiles (202). The multiple magnetic tiles (202) are sequentially attached to the inner wall of the shell (201) along the circumferential direction. The outer edge of the front end plate (4) is tapered backward to form an annular step (14). A front end bearing (15) is sleeved on the step (14). An annular front positioning plate (203) is integrally formed at the front end of the shell (201). The front positioning plate (203) is located in front of the step (14) and abuts against the front end bearing (15). The rotor assembly (2) is rotatably connected to the front end plate (4) through the front end bearing (15).

2. The external rotor motor according to claim 1, characterized in that, A positioning ring (12) coaxial with the central tube (3) is fixedly provided on the front end surface of the rear end plate (5). The positioning ring (12) surrounds the central tube (3) and is rotatably connected to the central tube (3) through the rear end bearing (13). The rear end bearing (13) is located between the collar (10) and the rear end plate (5).

3. The external rotor motor according to claim 1, characterized in that, The rear end of the housing (201) is fixedly connected to the rear end plate (5) by bolts (16).

4. The external rotor motor according to any one of claims 1 to 3, characterized in that, The stator assembly (1) includes an external toothed stator core (101) fixedly sleeved on the central tube (3) and two skeletons (102), as well as multiple windings (103) wound on the external teeth of the stator core (101). The two skeletons (102) are respectively disposed at both ends of the stator core (101) and are attached to both ends of the stator core (101). The front end plate (4) is provided with multiple wire holes (17) and multiple internal thread holes (18). The internal thread holes (18) extend from the front end of the front end plate (4).

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