CN214479968U

CN214479968U - External rotor motor structure

Info

Publication number: CN214479968U
Application number: CN202120345037.3U
Authority: CN
Inventors: 庄擎
Original assignee: Shiro Motor Shanghai Co ltd
Current assignee: Shiro Motor Shanghai Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-10-22
Anticipated expiration: 2031-02-07

Abstract

The application relates to the technical field of external rotor motors, in particular to an external rotor motor structure which comprises an external rotor shell with an opening at one end, an end cover detachably connected with the opening end of the external rotor shell, a first sealing ring arranged at the joint of the external rotor shell and the end cover, a motor shaft penetrating through the external rotor shell, a bearing sleeved on the motor shaft and an inner stator sleeved on the motor shaft; a second sealing ring is circumferentially arranged on the motor shaft and at the penetrating position of the end cover; the outer rotor shell and the end cover are connected in a detachable mode in a bolt connection mode after being screwed down in a threaded mode. This application has the effect of the leakproofness of improving the motor.

Description

External rotor motor structure

Technical Field

The application relates to the technical field of external rotor motors, in particular to an external rotor motor structure.

Background

At present, the outer rotor motor is frequently used in a fan impeller due to the characteristics of space saving, compact design and attractive appearance, and the sealing performance of the connection part of a motor shell and an end cover needs to be improved when the outer rotor motor in the prior art is used for a high requirement on the sealing performance of the motor.

With respect to the related art among the above, the inventors consider that there is a defect that the motor sealing property is poor.

SUMMERY OF THE UTILITY MODEL

In order to improve the leakproofness of motor, this application provides an external rotor motor structure.

The application provides an outer rotor motor structure adopts following technical scheme:

an outer rotor motor structure comprises an outer rotor shell with an opening at one end, an end cover detachably connected with the opening end of the outer rotor shell, a first sealing ring arranged at the joint of the outer rotor shell and the end cover, a motor shaft penetrating through the outer rotor shell, a bearing sleeved on the motor shaft and an inner stator sleeved on the motor shaft; and a second sealing ring is circumferentially arranged on the motor shaft and at the penetrating position of the end cover.

By adopting the technical scheme, the outer rotor shell and the end cover are detachably connected, and the motor shaft is respectively matched with the outer rotor shell and the end cover through the bearing, so that the outer rotor shell and the end cover rotate together, the end cover is not easy to loosen, and the sealing property between the outer rotor shell and the end cover is better. The arrangement of the first sealing ring and the second sealing ring enables the sealing performance of the whole outer rotor motor to be better.

Optionally, the outer rotor shell and the end cover are detachably connected by screwing in a threaded connection and then connecting with a bolt.

Through adopting above-mentioned technical scheme, the back is screwed up with the end cover earlier to the external rotor casing adoption threaded connection, and the connection can be dismantled in reuse bolted connection's mode realization, and threaded connection's mode makes further improvement of leakproofness, and reuse bolted connection's mode is consolidated, makes difficult production not hard up between external rotor casing and the end cover, and the leakproofness is better.

Optionally, the outer wall of the joint of the outer rotor shell and the end cover is provided with a sealing coating for sealing the gap.

By adopting the technical scheme, the outer rotor shell and the end cover are not of an integrally formed structure, so that a gap is formed at the joint of the outer rotor shell and the end cover, and the sealing coating can block the gap, so that the sealing property between the outer rotor shell and the end cover is better.

Optionally, a plurality of seal grooves sharing a geometric center are arranged on the outer end face of the end cover along the axial direction.

Through adopting above-mentioned technical scheme, seal groove on the end cover can match with the mounting flange that is used for installing the motor, makes the gap of butt department between end cover and the mounting flange littleer, and the leakproofness is better, and when also being convenient for produce relative motion between mounting flange and the end cover, the difficult emergence of end cover damages, influences the leakproofness.

Optionally, an elastic gasket is arranged on the surface of the end cover located on the sealing groove.

Through adopting above-mentioned technical scheme, elastic gasket's setting, elastic gasket enables the gap between end cover and the mounting flange littleer, can also play the effect of buffering, avoids the end cover to take place to damage and influence the leakproofness of motor.

Optionally, the inner stator includes a stator core sleeved on the motor shaft and end plates symmetrically arranged at two ends of the stator core.

Through adopting above-mentioned technical scheme, stator core and winding coil are motionless, and the end plate setting is at stator core's both ends, protects stator core's both ends.

Optionally, the end cover is inwards provided with an inner annular plate which is tightly abutted to the end plate along the axis direction, the end plate is provided with a sleeve along the axis direction far away from the stator core, and the inner side surface of the sleeve is abutted to the outer side surface of the inner annular plate.

Through adopting above-mentioned technical scheme, butt between annular plate and the sleeve does not influence the end cover and rotates along with outer rotor housing, and sleeve and annular plate cooperation are used and can regard as the motor can with external last seal structure, further improve the leakproofness of this application.

Optionally, the size of the opening of the sleeve gradually decreases towards the stator core along the axis.

Through adopting above-mentioned technical scheme, along with the installation fastening of end cover, the annular plate advances more to the sleeve is interior, and then makes the gap between sleeve and the annular plate reduce to reach the purpose of improving the leakproofness.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the connection can be dismantled to external rotor housing and end cover in this application, and the motor shaft passes through the bearing respectively with external rotor housing and end cover cooperation, makes external rotor housing and end cover take place to rotate together, and the not hard up condition of end cover is difficult for taking place, makes the leakproofness between external rotor housing and the end cover better. The arrangement of the first sealing ring and the second sealing ring enables the sealing performance of the whole outer rotor motor to be better;

2. the outer rotor shell and the end cover are not of an integrally formed structure, so that a gap is formed at the joint of the outer rotor shell and the end cover, and the gap can be blocked by the sealing coating, so that the sealing property between the outer rotor shell and the end cover is better;

3. the butt between annular plate and the sleeve in this application does not influence the end cover and rotates along with outer rotor housing, and sleeve and annular plate cooperation use can regard as the motor can with external last seal structure, further improve the leakproofness of this application.

Drawings

Fig. 1 is an overall structural schematic diagram of an outer rotor motor structure disclosed in an embodiment of the present application.

Fig. 2 is an exploded view of fig. 1 along the axis of the motor shaft.

Fig. 3 is a schematic structural diagram of an end cap in an embodiment of the present application.

Description of reference numerals: 11. an outer rotor housing; 21. an end cap; 211. a sealing groove; 212. an elastic pad; 213. an inner annular plate; 22. a first seal ring; 31. a motor shaft; 32. a bearing; 41. an inner stator; 411. a stator core; 412. an end plate; 413. a sleeve; 51. and a second seal ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

It should be understood that, in the related art, the housing of the external rotor motor is a rotor, and the end cover does not rotate, so that during the operation of the motor, because the housing rotates and the end cover does not rotate, the gap at the connection between the housing and the end cover has low sealing performance during the operation of the motor. Therefore, an outer rotor motor structure is required to solve the above problems.

The embodiment of the application discloses an outer rotor motor structure. Referring to fig. 1 and 2, an outer rotor motor structure includes an outer rotor case 11, an end cover 21, a first seal ring 22, a motor shaft 31, a bearing 32, an inner stator 41, and a second seal ring 51. The end cover 21 is detachably connected with the open end of the outer rotor housing 11, the first seal ring 22 is arranged at the connection position of the outer rotor housing 11 and the end cover 21, the motor shaft 31 is arranged in the outer rotor housing 11 in a penetrating manner, the bearing 32 is arranged on the motor shaft 31 in a sleeved manner, the inner stator 41 is arranged on the motor shaft 31 in a sleeved manner, and the second seal ring 51 is circumferentially arranged on the motor shaft 31 at the penetrating position with the end cover 21.

Referring to fig. 1 and 2, the outer rotor housing 11 may be made of soft iron, a3 steel, or soft magnetic alloy, a plurality of permanent magnet poles are circumferentially attached to an inner side surface of the housing as a rotor, an annular clamping plate is further disposed on an inner side surface of the outer rotor housing 11 to allow the power supply shaft 31 and the rotating shaft on the power supply shaft 31 to be installed in a penetrating manner, and the annular clamping plate and the outer rotor housing 11 are integrally formed. In some possible embodiments of the present application, the outer rotor housing 11 and the end cover 21 are detachably connected by screwing and then bolting, and the sealing performance is better.

Furthermore, in order to make the motor have better sealing performance, sealing coatings for plugging the joints are arranged on the outer walls of the joints of the outer rotor shell 11 and the end covers 21, and the sealing coatings can adopt T2075 hydrogen sealing glue, so that the motor has better sealing performance.

Referring to fig. 2 and 3, the end cover 21 is a cover body with an opening gradually decreasing from the opening end to the other end, a plurality of reinforcing ribs are circumferentially arranged on the inner side surface of the end cover 21, and the reinforcing ribs and the end cover 21 are integrally formed, so that the end cover is higher in structural strength and not easy to damage. In addition, a plurality of sealing grooves 211 sharing a geometric center are arranged on the outer end face of the end cover 21 along the axial direction, and the external motor mounting flange is matched and mounted in the sealing grooves 211. An elastic gasket 212 is further bonded in the sealing groove 211, and the elastic gasket 212 may also be made of rubber.

Referring to fig. 2, the first sealing ring 22 may be a rubber sealing ring, the first sealing ring 22 is attached to an end face of the end cover 21 and abuts against an end face of an open end of the outer rotor housing 11, and when the end cover 21 is screwed and fastened by bolts, the sealing performance of the motor can reach IP55 level under the combined action of the first sealing ring 22 and the sealing coating.

Referring to fig. 1 and 2, the motor shaft 31 is a cylindrical shaft, the motor shaft 31 is in interference fit with the outer rotor housing 11 and the end cover 21 through the bearing 32, the bearing 32 can be installed in the outer rotor housing 11 and the end cover 21 in a knocking or pressing manner, two ends of the motor shaft 31 respectively penetrate through the two bearings 32, and the bearing 32 is in interference fit with the motor shaft 31.

Referring to fig. 2, the inner stator 41 includes a stator core 411 sleeved on the motor shaft 31 and end plates 412 symmetrically disposed at both ends of the stator core 411, wherein the stator core 411 is composed of a core portion and an excitation winding wound around the core portion. The number of the end plates 412 is two, and the end plates 412 are symmetrically arranged at two ends of the stator core 411, and the connection relationship between the end plates 412 and the stator core may be welding.

In addition, in order to improve the sealing performance of the motor, referring to fig. 2, an inner annular plate 213 tightly abutting against the end plate 412 is disposed inward along the axial direction of the end cover 21, a sleeve 413 is disposed in the direction in which the end plate 412 is away from the stator core 411 along the axial direction, an inner side surface of the sleeve 413 abuts against an outer side surface of the inner annular plate 213, and the sleeve 413 gradually advances into the inner annular plate 213 and abuts against the inner annular plate 213 in the process of tightly closing the end cover 21. In some other possible embodiments of the present application, the size of the opening of the sleeve 413 is gradually reduced along the axis toward the stator core 411, so that the inner annular plate 213 has a smaller gap when the sleeve 413 abuts against the inner annular plate, and the sealing performance is better.

Referring to fig. 2 and 3, the second sealing ring 51 is disposed on the motor shaft 31 at a penetrating position with the end cover 21, that is, a through hole for the motor shaft 31 to penetrate through is formed in the end cover 21, and the second sealing ring 51 is sleeved on the position of the motor shaft 31 at the through hole, in some possible embodiments of the present application, the second sealing ring 51 may be a skeleton-type sealing ring.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An external rotor electric machine structure which characterized in that: the outer rotor type motor comprises an outer rotor shell (11) with an opening at one end, an end cover (21) detachably connected with the opening end of the outer rotor shell (11), a first sealing ring (22) arranged at the joint of the outer rotor shell (11) and the end cover (21), a motor shaft (31) penetrating through the outer rotor shell (11), a bearing (32) sleeved on the motor shaft (31) and an inner stator (41) sleeved on the motor shaft (31); and a second sealing ring (51) is circumferentially arranged on the motor shaft (31) and the penetrating position of the end cover (21).

2. The external rotor electric machine structure according to claim 1, wherein: the outer rotor shell (11) and the end cover (21) are detachably connected in a mode of being connected through bolts after being screwed down through threads.

3. An external rotor motor structure according to claim 1 or 2, wherein: and sealing coatings for plugging gaps are arranged on the outer walls of the joints of the outer rotor shell (11) and the end covers (21).

4. The external rotor electric machine structure according to claim 1, wherein: and a plurality of sealing grooves (211) with the same geometric center are arranged on the outer end surface of the end cover (21) along the axial direction.

5. The external rotor motor structure according to claim 4, wherein: and an elastic gasket (212) is arranged on the surface of the end cover (21) positioned in the sealing groove (211).

6. The external rotor electric machine structure according to claim 1, wherein: the inner stator (41) comprises a stator core (411) sleeved on the motor shaft (31) and end plates (412) symmetrically arranged at two ends of the stator core (411).

7. The external rotor electric machine structure according to claim 6, wherein: end cover (21) are equipped with interior annular plate (213) with the tight butt of end plate (412) cover along the axis direction is inwards, end plate (412) are equipped with sleeve (413) to the direction of keeping away from stator core (411) along the axis, the medial surface of sleeve (413) and the lateral surface butt of interior annular plate (213).

8. The external rotor electric machine structure according to claim 7, wherein: the opening size of the sleeve (413) is gradually reduced along the axis in the direction close to the stator core (411).