CN216489953U - Waterproof structure of external rotor motor and motor - Google Patents

Abstract

The utility model provides a waterproof structure of an outer rotor motor and the motor, wherein the waterproof structure comprises: the rotor shell, rotor shaft and stator ring flange, the stator ring flange can support the rotor shaft, rotor shell and rotor shaft are fixed and can rotate as an organic whole, rotor shell extends to along the axial of rotor shaft and with stator ring flange clearance fit, and rotor shell's the second grade slope that sets the slope with stator ring flange complex outer peripheral face, rotor shell's the outer peripheral face that meets with the second grade slope still is set the one-level slope that inclines, the one-level slope extends towards radial outside slope along the in-process of marcing to the stator ring flange, the second grade slope extends towards radial outside slope along the in-process of marcing to the stator ring flange, and one-level slope is not parallel with the second grade slope. According to the utility model, the potential energy of water flow flowing into the motor is reduced through the matching of the two slopes, water is prevented from entering the motor, the waterproof performance in operation is enhanced, and the reliability of the motor is improved.

Description

Waterproof structure of external rotor motor and motor

Technical Field

The utility model relates to the technical field of motors, in particular to a waterproof structure of an outer rotor motor and the motor.

Background

The waterproof problem of external rotor motor has always been the difficult problem of puzzlement industry, and the waterproof construction between the rotor of external rotor motor for small-size ventilation machine and the stator part often adopts clearance seal's form, and its water-proof effects is relatively poor, easily leads to the inside damage of intaking of motor. Therefore, the utility model relates to a sealing structure to improve above-mentioned problem.

Because the waterproof structure between the rotor and the stator part of the outer rotor motor in the prior art adopts a gap sealing mode, the waterproof effect is poor, and the technical problems that the motor is damaged due to water inflow and the like are caused, the waterproof structure of the outer rotor motor and the motor are researched and designed.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defect that the waterproof structure between the rotor and the stator part of the outer rotor motor in the prior art adopts a gap sealing mode, the waterproof effect is poor, and the damage caused by water inflow inside the motor is caused, thereby providing the waterproof structure of the outer rotor motor and the motor.

In order to solve the above problems, the present invention provides a waterproof structure of an outer rotor motor, including:

the rotor shaft is supported by the stator flange plate, the rotor shell and the rotor shaft are fixed and can rotate integrally, the rotor shell extends to be in clearance fit with the stator flange plate along the axial direction of the rotor shaft, the outer peripheral surface of the rotor shell matched with the stator flange plate is set to be an inclined secondary slope surface, the outer peripheral surface of the rotor shell connected with the secondary slope surface is also set to be an inclined primary slope surface, the primary slope surface extends towards the radial outer side in the advancing process of the rotor shell to the stator flange plate in an inclined mode, the secondary slope surface extends towards the radial outer side in the advancing process of the rotor shell to the stator flange plate in an inclined mode, and the primary slope surface is not parallel to the secondary slope surface.

In some embodiments, the primary ramp surface forms an acute angle α 1 with the axis of the rotor shaft, and the secondary ramp surface forms an acute angle α 2 with the axis of the rotor shaft, with α 2 > α 1 > 0.

In some embodiments, the shaft section of the rotor housing on which the primary slope surface is disposed is a first-stage flow guiding structure, the shaft section of the rotor housing on which the secondary slope surface is disposed is a second-stage flow guiding structure, and the stator flange is provided with a waterproof groove, so that at least part of the second-stage flow guiding structure is accommodated in the waterproof groove, and the second-stage flow guiding structure is in clearance fit with the waterproof groove.

In some embodiments, the surface of the second-stage flow guide structure facing the stator flange is a first bottom surface, the bottom of the waterproof groove is a second bottom surface, one of the first bottom surface and the second bottom surface is provided with a protrusion protruding towards the other, the other is provided with a groove matched with the protrusion, and the protrusion can be inserted into the groove.

In some embodiments, a radially outer end of the second stage flow directing structure is clearance fit with a radially outer end of the watertight slot; and the radial inner end of the second-stage flow guide structure is in clearance fit with the radial inner end of the waterproof groove.

In some embodiments, the protrusion is an annular protrusion formed around an axis of the rotor shaft, and the groove is an annular groove formed around the axis of the rotor shaft; and/or the bulges are more than two arranged at intervals along the radial direction, the grooves are also more than two arranged at intervals along the radial direction, and the bulges and the grooves are arranged in one-to-one correspondence.

In some embodiments, the axis of the rotor shaft extends in a horizontal direction, the first bottom surface is inclined in a direction of the second bottom surface during travel in a direction to the radial outside, and there is a third inclination angle α 3 other than 0 with the vertical surface; the second bottom surface is inclined in a direction away from the first bottom surface during traveling in a direction radially outward, and a fourth inclination angle α 4 different from 0 exists with the vertical surface.

In some embodiments, α 3 is 5 ° to 10 °; alpha 4 is 5-10 degrees.

In some embodiments, a drainage groove is further formed in the stator flange, one end of the drainage groove is communicated with the waterproof groove, and the other end of the drainage groove is communicated to the outside of the stator flange.

In some embodiments, the drain groove extends in a radial direction, and the other end thereof extends to an outer peripheral surface of the stator flange; and/or at least two drainage grooves are arranged at intervals along the circumferential direction of the stator flange plate.

In some embodiments, there are 3 drainage grooves, and every two drainage grooves are separated by an included angle of 120 ° in the circumferential direction of the circumference; one of the drainage grooves extends downwards along the vertical direction.

In some embodiments, the rotor further comprises a waterproof cover plate, the waterproof cover plate is connected to the stator flange plate and can be covered above at least part of the secondary slope surface, and a gap exists between the waterproof cover plate and the outer peripheral surface of the rotor shell.

In some embodiments, the waterproof cover plate includes an inner ring and an outer ring, the outer ring is fixedly connected to the stator flange, a radial outer end of the inner ring is connected to the outer ring, and a radial inner end of the inner ring is tilted upward and located above at least a portion of the secondary slope surface.

In some embodiments, the bottom surface of the inner race is parallel to the secondary ramp surfaces, and the length of the bottom surface of the inner race is greater than or equal to 2/3 of the length of the secondary ramp surfaces.

The utility model also provides a motor which comprises the waterproof structure of the outer rotor motor.

The waterproof structure of the outer rotor motor and the motor provided by the utility model have the following beneficial effects:

1. the rotor shell of the outer rotor motor is connected with the stator flange plate, the structure with the first-stage slope surface and the second-stage slope surface is arranged, the first-stage slope plays a buffering role, the second-stage slope plays a guiding role, potential energy of water flow flowing into the motor can be reduced to the maximum extent due to the matching of the two slopes, the water flow can be effectively prevented from entering the motor, and a novel motor waterproof structure is formed, so that the problem that liquid easily flows into an inner cavity of the stator in the working process of the motor is solved; meanwhile, the motor can achieve a better waterproof effect no matter the motor is installed at any angle. The structure is adopted on the outer rotor motor, so that the waterproof performance of the outer rotor motor in the operation process can be effectively enhanced, the reliability of the motor is improved, and the outer rotor motor can achieve a better waterproof effect at any installation angle. Meanwhile, the flow guide structure is simple and reliable to manufacture and good in manufacturability;

2. the stator flange plate is provided with a waterproof groove, and the waterproof groove can accommodate part of the second-stage flow guide structure to form a matching structure; a concave groove and a convex structure which are matched with each other are arranged between the bottom surface of the waterproof groove and the bottom surface of the second-stage flow guide structure to form a concave-convex combined type staggered structure, so that water can be further prevented from entering the motor, and the waterproof performance is further improved; the first bottom surface inclines towards the second bottom surface in the advancing process along the radial outward direction, and the second bottom surface inclines towards the direction back to the first bottom surface in the advancing process along the radial outward direction, so that the first bottom surface and the second bottom surface form a slope which is low in outside and high in inside and is from inside to outside, water can be further prevented from entering the motor, and the waterproof performance is further improved;

3. the utility model also provides a waterproof cover plate which is matched with a motor rotor for waterproofing, so that liquid can be prevented from directly dripping on the motor rotor to a certain extent. The waterproof effect is better, water can be further prevented from entering the motor, and the waterproof performance is further improved; the water in the waterproof groove in the stator flange plate can be effectively led out to the outside of the stator flange plate through the arrangement of the water drainage groove, and the liquid which flows into the waterproof structure carelessly can flow out along with the groove when the motor runs and is not accumulated in the groove.

Drawings

Fig. 1 is a general assembly three-dimensional structure view of a waterproof structure of an outer rotor motor of the present invention;

fig. 2 is a longitudinal sectional structural view of a waterproof structure of an outer rotor motor of the present invention;

fig. 3 is a partially enlarged view of a portion a in fig. 2;

fig. 4 is a partially enlarged view of a portion B in fig. 2.

The reference numerals are represented as:

1. a rotor housing; 2. a rotor shaft; 3. a stator flange; 31. a waterproof groove; 32. a second bottom surface; 33. A protrusion; 41. a first grade slope surface; 42. a second grade slope surface; 43. a first stage flow guide structure; 44. a second stage flow guide structure; 45. a first bottom surface; 46. a groove; 5. a waterproof cover plate; 51. an inner ring; 52. an outer ring; 6. a water drainage tank; 7. a magnetic ring.

Detailed Description

As shown in fig. 1 to 4, the present invention provides a waterproof structure of an outer rotor motor, which includes:

a rotor housing 1, a rotor shaft 2 and a stator flange 3, the stator flange 3 being capable of supporting the rotor shaft 2, the rotor shell 1 and the rotor shaft 2 are fixed and can rotate integrally, the rotor shell 1 extends along the axial direction of the rotor shaft 2 to be in clearance fit with the stator flange 3, and the outer peripheral surface of the rotor case 1 that mates with the stator flange 3 is provided with inclined secondary ramp surfaces 42, the outer circumferential surface of the rotor case 1 that meets the secondary ramp surfaces 42 is also provided with inclined primary ramp surfaces 41, the primary ramp surfaces 41 extend obliquely radially outwardly during travel to the stator flange 3, the secondary ramp surfaces 42 extend obliquely radially outwardly during travel to the stator flange 3, and the primary ramp surfaces 41 are non-parallel to the secondary ramp surfaces 42.

The rotor shell of the outer rotor motor is connected with the stator flange plate, the structure with the first-stage slope surface and the second-stage slope surface is arranged, the first-stage slope plays a buffering role, the second-stage slope plays a guiding role, potential energy of water flow flowing into the motor can be reduced to the maximum extent due to the matching of the two slopes, the water flow can be effectively prevented from entering the motor, and a novel motor waterproof structure is formed, so that the problem that liquid easily flows into an inner cavity of the stator in the working process of the motor is solved; meanwhile, the motor can achieve a better waterproof effect no matter the motor is installed at any angle. The structure is adopted on the outer rotor motor, so that the waterproof performance of the outer rotor motor in the operation process can be effectively enhanced, the reliability of the motor is improved, and the outer rotor motor can achieve a better waterproof effect at any installation angle. Meanwhile, the flow guide structure is simple and reliable to manufacture and good in manufacturability.

The utility model provides a novel waterproof structure suitable for an outer rotor motor. It is characterized in that:

1. the bottom of the rotor shell is provided with a boot-shaped slope diversion structure, and the diversion structure is provided with two sections of diversion slopes: a primary ramp and a secondary ramp;

2. the stator is provided with a riveted waterproof cover plate, and an inclined plane is arranged at the overhead part of the cover plate along the riveted inner ring;

3. two surfaces of the bottom of the rotor shell boot-shaped flow guide structure, which are matched with the stator flange plates, are correspondingly provided with oblique concave-convex combined type staggered backflow structures, and a water drainage groove is formed at intervals of 120 degrees.

The structure of the utility model is suitable for an outer rotor motor, and generally comprises a rotor of the outer rotor motor and a stator flange fixed with a motor stator and matched with a rotor groove. The rotor comprises a rotor shell, a rotor shaft, a flow guide structure and a magnetic ring; the stator flange plate comprises a groove matched with the flow guide part, a waterproof cover plate, a water drainage groove and a bearing chamber for fixing the bearing. By adjusting the relative positions of the fixed bearing and the rotor shaft, the flow guide part of the rotor can be matched with the groove of the stator flange plate, so that a waterproof structure is formed as shown in fig. 1 and 2.

In some embodiments, the acute angle included between the primary ramp surface 41 and the axis of the rotor shaft 2 is α 1, the acute angle included between the secondary ramp surface 42 and the axis of the rotor shaft 2 is α 2, and α 2 > α 1 > 0. The optimal relationship between the first-stage slope surface and the second-stage slope surface is that as shown in fig. 3, the included angle between the second-stage slope surface and the axis of the rotor shaft is larger than the included angle between the first-stage slope surface and the axis, so that the first-stage slope can effectively buffer incoming water flow, the second-stage slope can guide the water flow to return to the original direction, the second-stage arrangement form effectively blocks the water outside the stator flange plate, the water flowing from the rotor shell cannot easily enter the stator flange and then enter the stator to affect the performance, and the waterproof performance is improved.

In some embodiments, the shaft section of the rotor housing 1 on which the primary slope surface 41 is disposed is a first-stage flow guiding structure 43, the shaft section of the rotor housing 1 on which the secondary slope surface 42 is disposed is a second-stage flow guiding structure 44, and the stator flange 3 is provided with a waterproof groove 31, so that at least part of the second-stage flow guiding structure 44 is accommodated in the waterproof groove 31, and the second-stage flow guiding structure 44 is in clearance fit with the waterproof groove 31. The rotor shell is provided with a first-stage slope surface, a second-stage slope surface and a stator flange plate, wherein the first-stage slope surface is formed by a shaft section, the second-stage slope surface is formed by a shaft section, the stator flange plate is provided with a waterproof groove, the waterproof groove can effectively accommodate at least part of the second-stage slope structure, positioning and matching effects are formed, the second-stage slope surface and the waterproof groove are in clearance fit, and the stator flange plate is fixed and fixed along with the rotor shaft, so that friction or obstruction to rotation of the rotor shell can be effectively avoided by the clearance fit mode, and an excellent waterproof effect can be achieved.

In some embodiments, the primary ramp surface 41 and the secondary ramp surface 42 smoothly transition. Smooth transition between the first-stage slope surface and the second-stage slope surface can reduce resistance formed by corners, impact on water and noise, and effectively return water from an original way, thereby improving waterproof capability.

The surface of the second-stage flow guide structure 44 facing the stator flange 3 is a first bottom surface 45, the bottom of the waterproof groove 31 is a second bottom surface 32, one of the first bottom surface 45 and the second bottom surface 32 is provided with a protrusion 33 protruding towards the other, the other is provided with a groove 46 matched with the protrusion 33, and the protrusion 33 can be inserted into the groove 46. The protrusion or the groove is arranged on the first bottom surface, and the groove or the protrusion is arranged on the second bottom surface, so that the protrusion and the groove can form a plug-in fit to form a concave-convex combined type staggered structure, water can be further prevented from entering the motor, and the waterproof performance is further improved.

In some embodiments, the radially outer end of the second stage flow guide structure 44 is clearance fit with the radially outer end of the watertight slot 31; the radial inner end of the second-stage flow guide structure 44 is in clearance fit with the radial inner end of the waterproof groove 31. The radial outer end of the second-stage flow guide structure is in clearance fit with the radial outer end of the waterproof groove, and the radial inner end of the second-stage flow guide structure is in clearance fit with the radial inner end of the waterproof groove, so that the second-stage flow guide structure can effectively rotate relative to the waterproof groove, a waterproof dynamic sealing structure is formed, and the waterproof capability is improved.

In some embodiments, the protrusion 33 is an annular protrusion formed around the axis of the rotor shaft 2, and the groove 46 is an annular groove formed around the axis of the rotor shaft 2; and/or more than two protrusions 33 are arranged at intervals along the radial direction, more than two grooves 46 are also arranged at intervals along the radial direction, and the protrusions 33 and the grooves 46 are arranged in a one-to-one correspondence manner. The bulge is a further preferable structural form of the bulge, the waterproof performance of the bulge in the circumferential direction can be further improved through the annular groove, and the waterproof effect of the bulge can be further improved through more than two bulges arranged at intervals in the radial direction.

In some embodiments, the axis of the rotor shaft 2 extends in a horizontal direction, the first bottom surface 45 is inclined in the direction of the second bottom surface 32 during travel in the direction to the radial outside, and there is a third inclination angle α 3 with the vertical plane that is different from 0; the second bottom surface 32 is inclined in a direction away from the first bottom surface 45 during travel in a direction radially outward and at a fourth inclination angle α 4 different from 0 with respect to the vertical. Through first bottom surface along the in-process of marcing to radial outside direction towards the direction slope of second bottom surface, the second bottom surface is along the in-process of marcing to radial outside direction towards dorsad the direction slope of first bottom surface effectively makes first bottom surface and second bottom surface all form outside low interior height, from inside to outside slope, can further prevent inside water entering motor, further improves waterproof performance.

In some embodiments, α 3 is 5 ° to 10 °; alpha 4 is 5-10 degrees.

The bottom of the shell of the rotor part comprises a boot-shaped diversion structure, the shell is integrally molded into an optimal shape through die casting, the boot-shaped diversion structure at the bottom of the rotor shell is designed with a primary slope and a secondary slope, the two slopes are uniformly connected and transited, the primary slope plays a buffering role, the secondary slope plays a diversion role, the two slopes are matched to reduce the potential energy of water flow flowing into a motor to the maximum extent, and meanwhile, the bottom surface of the boot-shaped diversion structure is provided with a slope which is low outside and high inside and is from inside to outside, and the slope is 5-10 degrees, so that the water flow can be effectively prevented from entering the motor. As shown in fig. 3.

The stator flange part of the utility model is provided with a waterproof groove which is a convex groove and is matched with a groove in a boot-shaped diversion structure of the rotor part to form a concave-convex combined type dislocation structure, the number of the combined structures is one group or more, a certain gradient is designed on the combined surface from inside to outside along the radial direction, the gradient is consistent with the gradient angle mentioned above, the whole structure of the stator flange is formed by casting one time through a mould, and by using the structural combination, the resistance of fluid flowing to the inside of the stator can be effectively increased, so that the fluid can not flow into the inside of the motor as much as possible, as shown in figure 3.

In some embodiments, a drainage groove 6 is further formed in the stator flange 3, one end of the drainage groove 6 is communicated with the waterproof groove 31, and the other end is communicated to the outside of the stator flange 3. The utility model can effectively lead the water in the waterproof groove in the stator flange to the outside of the stator flange through the arrangement of the drainage groove, and ensures that the liquid which flows into the waterproof structure carelessly can flow out along with the groove and is not accumulated in the groove when the motor runs.

In some embodiments, the drain groove 6 extends in the radial direction, and the other end thereof extends to the outer peripheral surface of the stator flange 3; and/or, the number of the drain grooves 6 is at least two, and more than two drain grooves 6 are arranged at intervals along the circumferential direction of the stator flange 3. This is a further preferable configuration of the drain groove of the present invention, and water in the waterproof groove can be led out to the outer peripheral surface of the stator flange by the radially extending drain groove, so that the water can be effectively led out, and the waterproof effect can be improved; a plurality of sluicing grooves that set up at the circumference direction interval can effectively derive the water in the buckler at the different positions of circumference direction, further prevents effectively that water from getting into inside the motor, improves waterproof ability.

In some embodiments, there are 3 drainage grooves 6, and every two drainage grooves 6 are separated by an included angle of 120 ° in the circumferential direction of the circumference; one of the drainage grooves 6 extends downward in the vertical direction. The utility model also can drain water at different positions in the circumferential direction through 3 water draining grooves arranged at intervals in the circumferential direction, and the uniform water draining effect can be realized at intervals of included angles of 120 degrees; the vertically downward extending drainage groove can improve the drainage effect.

The stator flange plate is provided with three radial water drainage grooves which are uniformly distributed, the water drainage grooves are communicated with waterproof grooves, the included angle between every two grooves is 120 degrees, one water drainage groove can be selected to be vertically and downwards perpendicular to the ground to be installed according to the installation position when the whole machine is installed, and the purpose of the water drainage grooves is to ensure that liquid which flows into the waterproof structure carelessly and falls into the waterproof structure can flow out along the grooves when a motor runs and is not stored in the grooves, as shown in fig. 1 and fig. 3.

In some embodiments, the stator assembly further comprises a waterproof cover plate 5, the waterproof cover plate 5 is connected to the stator flange 3, the waterproof cover plate 5 can cover at least a portion of the secondary slope surface 42, and a gap exists between the waterproof cover plate 5 and the outer peripheral surface of the rotor housing 1. The utility model also provides a waterproof cover plate which is matched with a motor rotor for waterproofing, so that liquid can be prevented from directly dripping on the motor rotor to a certain extent. The waterproof motor has the advantages that a better waterproof effect is achieved, water can be further prevented from entering the motor, and the waterproof performance is further improved.

In some embodiments, the waterproof cover plate 5 includes an inner ring 51 and an outer ring 52, the outer ring 52 is fixedly connected to the stator flange 3, a radially outer end of the inner ring 51 is connected to the outer ring 52, and a radially inner end of the inner ring 51 is tilted upward and located above at least a portion of the secondary slope surface 42. The waterproof cover plate is a further preferable structural form of the waterproof cover plate, the outer ring is fixed on the stator flange plate through the arrangement of the outer ring and the inner ring, the inner ring tilts to shield the secondary slope surface, water flowing from the rotor shell can be effectively prevented from directly entering the motor, the tilting part of the inner ring plays a role in effectively shielding water and retaining water, and the waterproof effect is further improved.

In some embodiments, the bottom surface of the inner ring 51 is parallel to the secondary ramp surfaces 42, and the length of the bottom surface of the inner ring 51 is greater than or equal to 2/3 of the length of the secondary ramp surfaces 42. This is the utility model

The stator flange plate is riveted or bolted with a waterproof cover plate, and the cover plate is arranged on the riveting groove of the flange plate. The cover plate is divided into an inner ring and an outer ring, the outer ring is combined with a flange of the stator in a riveting mode, the inner ring is tilted, the inner ring covers the second-stage flow guide structure in a clearance mode and is parallel to the second-stage flow guide structure, the inclination angle of the inner ring is the same as that of the second-stage flow guide structure, and the length of the inner ring part of the cover plate can exceed 2/3 (no actual water retaining effect if the length of the inner ring part of the cover plate is not more than 2/3) of the length of the second-stage slope. The cover plate is matched with the motor rotor to be waterproof, so that liquid can be prevented from directly dropping on the motor rotor to a certain extent. The better waterproof effect is achieved, as shown in fig. 3 and fig. 4.

The utility model adopts the structure combination for use, can ensure that the motor can prevent liquid from flowing into the motor or lead out the liquid which flows into the motor at any installation angle, thereby enhancing the waterproof performance of the motor.

After the whole structure is installed, the whole structure is shown in fig. 1.

The specific processing and manufacturing mode of the utility model is as follows:

the first step is as follows: manufacturing and molding the rotor shell and the flow guide structure in a pouring mode;

the second step is that: manufacturing and molding a flange plate of the stator in a pouring mode;

the third step: manufacturing and molding the waterproof cover plate;

the fourth step: and the rotor and the stator are assembled and molded, and meanwhile, the waterproof cover plate is arranged on the flange plate through interference riveting fit or bolts to form an integral waterproof structure.

The utility model also provides a motor which comprises the waterproof structure of the outer rotor motor.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (15)

1. The utility model provides an outer rotor electric machine's waterproof construction which characterized in that: the method comprises the following steps:

a rotor housing (1), a rotor shaft (2) and a stator flange (3), wherein the stator flange (3) can support the rotor shaft (2), the rotor housing (1) and the rotor shaft (2) are fixed and can rotate integrally, the rotor housing (1) extends along the axial direction of the rotor shaft (2) to be in clearance fit with the stator flange (3), the outer peripheral surface of the rotor housing (1) matched with the stator flange (3) is provided with an inclined secondary slope surface (42), the outer peripheral surface of the rotor housing (1) connected with the secondary slope surface (42) is also provided with an inclined primary slope surface (41), the primary slope surface (41) extends obliquely towards the radial outer side in the process of advancing along the stator flange (3), and the secondary slope surface (42) extends obliquely towards the radial outer side in the process of advancing along the stator flange (3), and the primary ramp surface (41) and the secondary ramp surface (42) are not parallel.

2. The waterproof structure according to claim 1, characterized in that:

the included acute angle between the primary slope surface (41) and the axis of the rotor shaft (2) is alpha 1, the included acute angle between the secondary slope surface (42) and the axis of the rotor shaft (2) is alpha 2, and alpha 2 is more than alpha 1 and more than 0.

3. The waterproof structure according to claim 1 or 2, characterized in that:

the setting of rotor housing (1) the shaft portion of one-level slope face (41) is first order water conservancy diversion structure (43), the setting of rotor housing (1) the shaft portion of second order slope face (42) is second level water conservancy diversion structure (44), set up on stator ring flange (3) waterproof groove (31), make at least partial structure of second level water conservancy diversion structure (44) hold in waterproof groove (31), just second level water conservancy diversion structure (44) with waterproof groove (31) clearance fit.

4. The waterproof structure according to claim 3, characterized in that:

the surface, facing the stator flange plate (3), of the second-stage flow guide structure (44) is a first bottom surface (45), the bottom of the waterproof groove (31) is a second bottom surface (32), one of the first bottom surface (45) and the second bottom surface (32) is provided with a protrusion (33) protruding towards the other, the other one is provided with a groove (46) matched with the protrusion (33), and the protrusion (33) can be inserted into the groove (46).

5. The waterproof structure according to claim 3, characterized in that:

the radial outer end of the second-stage flow guide structure (44) is in clearance fit with the radial outer end of the waterproof groove (31); the radial inner end of the second-stage flow guide structure (44) is in clearance fit with the radial inner end of the waterproof groove (31).

6. The waterproof structure according to claim 4, characterized in that:

the projection (33) is an annular projection formed around the axis of the rotor shaft (2), and the groove (46) is an annular groove formed around the axis of the rotor shaft (2); and/or more than two protrusions (33) are arranged at intervals along the radial direction, more than two grooves (46) are also arranged at intervals along the radial direction, and the protrusions (33) and the grooves (46) are arranged in a one-to-one correspondence manner.

7. The waterproof structure according to claim 4, characterized in that:

the axis of the rotor shaft (2) extends in a horizontal direction, the first bottom surface (45) is inclined in the direction of the second bottom surface (32) during the travel in the direction to the radial outside, and a third inclination angle alpha 3 different from 0 exists with the vertical surface; the second bottom surface (32) is inclined in a direction away from the first bottom surface (45) during travel in a direction radially outward and presents a fourth inclination angle α 4 different from 0 with the vertical surface.

8. The waterproof structure according to claim 7, characterized in that:

α3＝5～10°；α4＝5～10°。

9. the waterproof structure according to claim 3, characterized in that:

a water draining groove (6) is further formed in the stator flange plate (3), one end of the water draining groove (6) is communicated with the waterproof groove (31), and the other end of the water draining groove is communicated to the outside of the stator flange plate (3).

10. The waterproof structure according to claim 9, characterized in that:

the water drainage groove (6) extends along the radial direction, and the other end of the water drainage groove extends to the outer peripheral surface of the stator flange plate (3); and/or the number of the drainage grooves (6) is at least two, and more than two drainage grooves (6) are arranged at intervals along the circumferential direction of the stator flange plate (3).

11. The waterproof structure according to claim 10, characterized in that:

the number of the water drainage grooves (6) is 3, and every two water drainage grooves (6) are spaced at an included angle of 120 degrees in the circumferential direction of the circumference; one of the drainage grooves (6) extends downwards along the vertical direction.

12. The waterproof structure according to claim 1, characterized in that:

the rotor comprises a stator flange plate (3), and is characterized by further comprising a waterproof cover plate (5), wherein the waterproof cover plate (5) is connected and arranged on the stator flange plate (3), the waterproof cover plate (5) can be arranged above at least part of the secondary slope surface (42) in a covering mode, and a gap exists between the waterproof cover plate (5) and the outer peripheral surface of the rotor shell (1).

13. The waterproof structure according to claim 12, characterized in that:

waterproof cover plate (5) include inner circle (51) and outer lane (52), outer lane (52) fixed connection be in on the stator ring flange (3), the radial outer end of inner circle (51) with outer lane (52) are connected, the radial inner end of inner circle (51) upwards perk and are located the at least partial top of second grade slope (42).

14. The waterproof structure according to claim 13, characterized in that:

the bottom surface of the inner ring (51) is parallel to the secondary slope surfaces (42), and the length of the bottom surface of the inner ring (51) is greater than or equal to 2/3 of the length of the secondary slope surfaces (42).

15. An electric machine characterized by: a waterproof structure including the outer rotor motor according to any one of claims 1 to 14.

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