CN113824253A - Air guide device, motor air duct structure and magnetic suspension motor - Google Patents

Abstract

The application provides an air ducting, motor wind channel structure and magnetic suspension motor. The air guide device comprises an annular shell (82), an air cavity (7) is formed in the inner ring side of the shell (82), a ventilation channel (84) is arranged on the inner peripheral wall of the shell (82), a narrow-slit air outlet (81) is formed in the outer peripheral side of the shell (82), the air cavity (7) is communicated with the narrow-slit air outlet (81) through the ventilation channel (84), and the ventilation area of the ventilation channel (84) is decreased progressively along the flowing direction of air flow. According to the air ducting of this application, can effectively retrain the flow direction of air current, improve the air current velocity of flow, improve the utilization ratio of cooling air.

Description

Air guide device, motor air duct structure and magnetic suspension motor

Technical Field

The application relates to the technical field of motors, in particular to an air guide device, a motor air duct structure and a magnetic suspension motor.

Background

The cooling mode that permanent magnet synchronous motor adopted among the magnetic suspension air compressor machine at present is water-cooling and air-cooling two kinds of modes usually, and the motor stator relies on the water-cooling heat dissipation on the casing, and rotor and bearing rely on the air-cooling heat dissipation. However, the permanent magnet synchronous motor has small volume, limited heat dissipation area and large internal wind resistance, and on one hand, even if a ventilation channel is arranged at the position of the bearing, cooling air is difficult to pass through the arranged ventilation channel as required due to the influence of resistance and flows out of an air outlet of the shell; on the other hand, the motor is high in rotating speed and power, the wind friction loss and the eddy current loss of the rotor are large, the temperature rise of the rotor is caused to be high, air after the rotor is cooled is heated and then flows through the bearing, the bearing can be heated, and the integral temperature rise inside the motor is influenced.

The motor air cooling relies on each way of reserved wind channel to cool off, but the direction of air current is uncontrollable, and the air current can be the diffusion form through the flow of expansion section, and the velocity of flow can reduce, and the utilization ratio of cooling air is lower.

Disclosure of Invention

Therefore, the technical problem that this application will be solved lies in providing an air ducting, motor wind channel structure and magnetic suspension motor, can effectively retrain the flow direction of air current, improves the air current velocity of flow, improves the utilization ratio of cooling air.

In order to solve the problem, the application provides an air ducting, including annular casing, the inner ring side of casing forms the wind cavity, is provided with ventilation channel on the internal perisporium of casing, and the periphery side of casing is provided with the slot air outlet, and the wind cavity passes through ventilation channel and slot air outlet intercommunication, and along the flow direction of air current, ventilation channel's ventilation area diminishes progressively.

Preferably, the end of the ventilation channel is provided with a slit, and the slit air outlet is positioned at the end of the slit.

Preferably, the flow guide wall surfaces of the ventilation channel and the slit are cambered surfaces, and the flow guide wall surface of the ventilation channel is in smooth transition connection with the flow guide wall surface of the slit.

Preferably, the inner peripheral wall of casing is provided with the convex wind-break piece to the inner periphery side of casing, and the wind-break piece is the annular, and the wind-break piece is located ventilation channel's air inlet back edge to towards the incoming flow direction buckling, the wind-break piece can be shunted the air current for partly air current gets into ventilation channel, and partly air current flows out along the axial of casing from the lee side of wind-break piece.

Preferably, the wind deflector includes an outer peripheral guide surface and an inner peripheral guide surface, the outer peripheral guide surface is engaged with a rear side guide wall surface of the ventilation passage, the inner peripheral guide surface is connected with an inner peripheral wall of the housing, and an interval between the outer peripheral guide surface and the inner peripheral guide surface increases progressively along a direction close to the inner peripheral wall of the housing.

Preferably, the outer circumferential flow guide surface is in a concave arc shape, and the inner circumferential flow guide surface is in a convex arc shape.

Preferably, the peripheral flow guide surface is flush with the rear side flow guide wall surface of the ventilation channel at the connecting position, and the peripheral flow guide surface is spliced with the rear side flow guide wall surface of the ventilation channel to form a smooth arc-shaped flow guide surface.

Preferably, an air outlet cover is arranged on the outer periphery of the shell, and the slit is positioned on the air outlet cover.

Preferably, the air outlet covers are arranged along the circumferential direction of the outer periphery of the shell at intervals, the ventilation channels are arranged along the circumferential direction of the inner periphery of the shell at intervals, and one ventilation channel corresponds to one air outlet cover.

Preferably, the tail end of the air outlet cover is bent towards the flow guide direction to form a bent section, and the slit is positioned on the bent section.

According to another aspect of the present application, a motor air duct structure is provided, which includes the above air guiding device.

Preferably, the motor air duct structure further comprises a casing, a stator, a rotor, a fan, a front bearing assembly, a rear bearing assembly and an end cover, wherein the end cover is fixedly connected to the casing, the air guide device is installed in the end cover, the fan is fixed to the rotor and located in an air cavity of the air guide device, a first cooling channel is arranged on the casing, and air flow can enter the first cooling channel through the air guide device under the action of the fan and enter the front bearing assembly through the first cooling channel.

Preferably, the motor air duct structure further comprises a second cooling channel, and the air flow can enter the second cooling channel through the air guide device and cool the rear bearing assembly and the rotor from the second cooling channel.

Preferably, the end cover is provided with a convex arc diversion surface at the narrow slit air outlet, and the convex arc diversion surface can divert the outlet air of the narrow slit air outlet to the first cooling channel.

Preferably, the end cover is provided with a flow guide channel communicated with the first cooling channel at a position connected with the casing, and the convex arc flow guide surface guides the airflow into the first cooling channel through the flow guide channel.

Preferably, the front side edge of the narrow-slit air outlet is connected with the convex arc diversion surface, and the diversion direction of the front side edge of the narrow-slit air outlet is tangent to the convex arc diversion surface at the connection position.

Preferably, an exhaust hood is sleeved on the outer peripheral side of the casing and provided with a ring cavity, an exhaust main pipe is arranged on the exhaust hood and communicated with the ring cavity, an exhaust outlet is formed in the casing, and the first cooling channel and the second cooling channel are communicated with the ring cavity through the exhaust outlet.

Preferably, the first cooling channel is a plurality of first cooling channels, and the plurality of first cooling channels are arranged at intervals along the circumferential direction of the casing.

Preferably, the casing is provided with a water channel therein, the water channel is arranged along the circumferential direction of the casing, and the first cooling channel is at least partially located on the outer circumferential side of the water channel.

Preferably, the first cooling channel includes a first axial section, a radial section and a second axial section, the first axial section is located at an axial outer side of the water channel, the second axial section is located at an outer peripheral side of the water channel, and the radial section communicates the first axial section and the second axial section.

Preferably, the periphery of the casing is provided with a raised line extending along the axial direction, the raised line is provided with a radial column at the connecting position of the first axial section and the second axial section, the radial column is provided with a radial hole communicated with the radial section, and a sealing plug is arranged in the radial hole.

Preferably, the periphery side cover of casing is equipped with the exhaust hood, and the exhaust hood has the annular chamber, is provided with the house steward of airing exhaust on the exhaust hood, and house steward and annular chamber intercommunication of airing exhaust are provided with the air exit on the casing, and first cooling channel and second cooling channel pass through air exit and annular chamber intercommunication, are provided with the mounting groove on the exhaust hood, and the sand grip is located the mounting groove.

Preferably, the two axial sides of the exhaust hood are provided with folded edges, and the folded edges are attached to the outer wall of the casing.

Preferably, the folded edge is fixedly connected with the casing through a screw.

Preferably, an air suction pump is connected to the exhaust manifold.

According to another aspect of the present application, a magnetic levitation motor is provided, which includes the above air guiding device or the above motor air duct structure.

The application provides an air ducting, including annular casing, the inner ring side of casing forms the wind chamber, is provided with the ventilation passageway on the internal perisporium of casing, and the periphery side of casing is provided with the slot air outlet, and the wind chamber passes through ventilation passageway and slot air outlet intercommunication, and along the flow direction of air current, the draught area of ventilation passageway subtracts progressively. This air ducting can utilize ventilation channel's the degressive characteristics of draught area for the air current is from the in-process that ventilation channel flows through the slot air outlet, gets into narrow space by the broad space, makes mutual extruded air from long and thin slot air outlet, sprays and goes out, can realize the concentrated flow of air current, effectively retrains the flow direction of air current, avoids the dispersion of air current, can accelerate the velocity of flow of air current simultaneously, improves the utilization efficiency of cooling air.

Drawings

Fig. 1 is a schematic structural diagram of a magnetic levitation motor according to an embodiment of the present application;

FIG. 2 is an enlarged schematic view of FIG. 1 at A;

fig. 3 is a schematic perspective view of a magnetic levitation motor according to an embodiment of the present application;

fig. 4 is a schematic perspective view of an air guiding device according to an embodiment of the present application;

fig. 5 is a schematic view illustrating an airflow flowing structure of an air guiding device according to an embodiment of the present application;

fig. 6 is a schematic perspective view of a hood according to an embodiment of the present application.

The reference numerals are represented as:

1. a housing; 2. a first cooling channel; 3. a vent hole; 4. a radial column; 5. an end cap; 6. a slit; 7. a wind cavity; 8. a fan; 9. an intake manifold; 10. a second cooling channel; 11. an air outlet; 12. a main exhaust duct; 13. a water channel; 14. an exhaust hood; 15. an air guide device; 16. a rotor; 17. a front bearing assembly; 18. a rear bearing assembly; 19. a stator; 81. a narrow-slit air outlet; 82. a housing; 83. a wind-shielding sheet; 84. a ventilation channel; 85. an air outlet cover; 20. a convex arc flow guide surface; 21. a flow guide channel; 22. an annular cavity; 23. a first axial segment; 24. a radial segment; 25. a second axial segment; 26. a sealing plug; 27. a convex strip; 28. mounting grooves; 29. and (7) folding edges.

Detailed Description

With combined reference to fig. 1 to 6, according to an embodiment of the present application, the air guiding device includes an annular housing 82, an inner annular side of the housing 82 forms the air cavity 7, an inner circumferential wall of the housing 82 is provided with a ventilation channel 84, an outer circumferential side of the housing 82 is provided with a narrow-slit air outlet 81, the air cavity 7 is communicated with the narrow-slit air outlet 81 through the ventilation channel 84, and a ventilation area of the ventilation channel 84 decreases progressively along a flow direction of an air flow.

This air ducting can utilize ventilation channel 84's the degressive characteristics of draught area, make the air current at the in-process that flows out from ventilation channel 84 through slot air outlet 81, get into narrow space by the broad space, make mutual extruded air spray and go out from long and thin slot air outlet 81, can realize the concentrated flow of air current, guide and step up the air current trend, make irregular air current flow become regular air current flow, the flow direction of effective restraint air current, avoid the dispersion of air current, the velocity of flow of air current can be accelerated simultaneously, the utilization efficiency of cooling air is improved.

The narrow-slit air outlet 81 is an air outlet on the outer peripheral side of the housing 82, and as shown in fig. 4, the circumferential length of the narrow-slit air outlet 81 is greater than the axial height, and in some embodiments, the ratio of the circumferential length to the axial height ranges from 5 to 20.

In one embodiment, the end of the ventilation channel 84 is provided with a slit 6, and the slit air outlet 81 is located at the end of the slit 6. In the present embodiment, the length of the slit 6 in the circumferential direction is the same as or greater than the circumferential length of the slit air outlet 81, and extends for a certain distance along the flow direction of the air flow, so that the air flow coming from the ventilation channel 84 can be squeezed for a sufficient distance, and a better air flow adjusting effect is obtained. The slit 6 is a narrow slit with a circumferential length greater than an axial height, and is designed to cooperate with a high-speed airflow and a convex arc surface, so that the airflow is easier to form a coanda effect after flowing out of the slit 6, and a coanda flow effect is achieved. In some embodiments, the ratio of the circumferential length to the axial height of the slit 6 may be defined in the range of 4 to 25.

In one embodiment, the ventilation channel 84 and the flow guiding wall surface of the slit 6 are cambered surfaces, and the flow guiding wall surface of the ventilation channel 84 is smoothly and transitionally connected with the flow guiding wall surface of the slit 6. In the present embodiment, the ventilation passage 84 is engaged with the guide wall surface of the slit 6, and can form a convex arc surface having a certain curvature. The coanda effect indicates that when a high pressure gas stream passes over a convex surface having a curvature, the gas stream is attracted to the curved surface and follows the curvature of the curve due to the pressure differential. A part of the air which runs at a high speed enters the wide ventilation channel 84, the air which is extruded mutually passes through the elongated slit 6 and is finally ejected from the narrow slit air outlet 81, and the air flow is guided to reach a preset position by utilizing the coanda effect of the air flow.

In one embodiment, the inner circumferential wall of the housing 82 is provided with a wind shielding sheet 83 protruding towards the inner circumferential side of the housing 82, the wind shielding sheet 83 is annular, the wind shielding sheet 83 is located at the rear edge of the inlet air of the ventilation channel 84 and is bent towards the incoming flow direction, and the wind shielding sheet 83 can divide the airflow, so that a part of the airflow enters the ventilation channel 84 and a part of the airflow flows out from the leeward side of the wind shielding sheet 83 along the axial direction of the housing 82.

In this embodiment, through setting up the wind-blocking sheet 83, can shunt the air current that enters into in the wind chamber 7 for some air currents can flow along the water conservancy diversion of ventilation passageway 84, and another wind can flow along the axial of casing 82 in the inner ring passageway of casing 82, thereby realizes the air current direction of equidirectional, realizes the air current cooling of different positions, satisfies the cooling demand of different positions, improves cooling efficiency.

In one embodiment, the wind deflector 83 includes an outer peripheral flow guide surface engaged with the rear flow guide wall surface of the ventilation passage 84 and an inner peripheral flow guide surface connected with the inner peripheral wall of the housing 82, the interval between the outer peripheral flow guide surface and the inner peripheral flow guide surface increasing in a direction close to the inner peripheral wall of the housing 82. In this embodiment, the windward side cross section of the wind shield 83 is the smallest, and a windward tip is formed, so that the flow resistance of the airflow flowing through the wind shield 83 can be reduced, the flow dividing effect of the wind shield 83 can be ensured, the airflow flowing efficiency is improved, and the flow loss of the airflow is reduced.

In one embodiment, the outer circumferential flow guide surface is a concave arc shape, and the inner circumferential flow guide surface is a convex arc shape, so that the outer circumferential flow guide surface of the wind shield 83 guides the airflow, the airflow enters the ventilation channel 84 in a large amount under the guiding action of the concave arc surface of the outer circumferential flow guide surface, and the flow loss of the airflow turning flow is reduced by utilizing the arc flow guide effect of the outer circumferential flow guide surface.

In one embodiment, the peripheral flow guide surface is flush with the rear flow guide wall surface of the ventilation channel 84 at the connection location, and the peripheral flow guide surface is spliced with the rear flow guide wall surface of the ventilation channel 84 to form a smooth arc-shaped flow guide surface. When the airflow flows along the peripheral flow guide surface, the airflow can directly flow to the rear side flow guide wall surface of the ventilation channel 84 along the peripheral flow guide surface, and then flow to the slit 6 along the rear side flow guide wall surface of the ventilation channel 84.

In one embodiment, the outer peripheral side of the housing 82 is provided with a wind outlet cover 85, and the slit 6 is located on the wind outlet cover 85. In this embodiment, the air outlet cover 85 is a part of the housing 82, and the slit 6 and the slit air outlet 81 can be easily provided by providing the air outlet cover 85.

In one embodiment, the air outlet covers 85 are circumferentially spaced along the outer circumference of the housing 82, the ventilation channels 84 are circumferentially spaced along the inner circumference of the housing 82, and one ventilation channel 84 is disposed corresponding to one air outlet cover 85. In this embodiment, the air outlet covers 85 are uniformly spaced along the circumferential direction of the casing 82, so that the ventilation channel 84 and the slit 6 can be conveniently arranged, and meanwhile, the material consumption of the air outlet covers 85 can be reduced according to the structural arrangement of the ventilation channel 84 and the slit 6, the material cost is reduced, and the overall quality of the air guide device is reduced.

In one embodiment, the end of the outlet cover 85 is bent toward the flow guiding direction to form a bent section, and the slit 6 is located on the bent section. In this embodiment, by adding the bending section, the arrangement of the ventilation channel 84 and the slit 6 can have enough space without excessively increasing the axial length of the air outlet cover 85, the structure of the ventilation channel 84 and the slit 6 can be reasonably designed, the smooth transition of the flow guide wall surfaces of the ventilation channel 84 and the slit 6 can be ensured, the airflow guide of the slit 6 can form a good engagement relation with the flow guide surface on the outer side, and the wall attachment effect of the airflow can be more conveniently realized. Since the air outlet cover 85 only needs to be provided with the bent section at a position corresponding to the slit 6, the number of structures required to be added to satisfy the arrangement of the slit 6 can be reduced, and the overall mass of the housing 82 is reduced.

In the working process of the air guide device, cooling air is pressed in from the ventilation channel 84 with a large space, the cooling air is forced to be leaked from the slit 6, and the air outlet pressure is enhanced after a period of time, so that the air outlet flow speed is higher. The air flowing out of the narrow-slit air outlet 81 needs a certain air speed to generate the coanda effect, so that the air guide device is particularly suitable for a motor rotating at a high speed.

Referring to fig. 1 to fig. 6 in combination, according to an embodiment of the present application, the motor air duct structure includes the air guiding device described above.

In one embodiment, the air duct structure of the motor further includes a casing 1, a stator 19, a rotor 16, a fan 8, a front bearing assembly 17, a rear bearing assembly 18, and an end cover 5, where the end cover 5 is fixedly connected to the casing 1, an air guide device 15 is installed in the end cover 5, the fan 8 is fixed to the rotor 16 and is located in an air cavity 7 of the air guide device 15, a first cooling channel 2 is provided on the casing 1, and an air flow can enter the first cooling channel 2 through the air guide device 15 under the action of the fan 8 and enter the front bearing assembly 17 through the first cooling channel 2.

In the present embodiment, the wind deflector 83 in the wind guide device 15 diverts the cooling wind, and a part of the cooling wind enters the gap between the rotor 16 and the other components, and a part of the cooling wind enters the wind chamber 7 of the casing 82 of the wind guide device 15. The air outlet flow guide surface of the air guide device 15 and the inner surface of the end cover are in a smooth curved surface at the joint position, and the air flow tends to be adsorbed to the convex surface when passing through the convex surface with a certain curvature by utilizing the wall attachment effect of the air flow. When cooling air passes through the narrow slit air outlet 81 of the air guide device 15, the air speed is high, air flow flows into the first cooling channel 2 along the cambered surface of the inner surface of the end cover due to the wall attachment effect, the effects of guiding flow and reducing air flow vortexes in the end cover 5 are achieved, accordingly, air flow loss is reduced, air flow noise is reduced, the air flow speed is improved, and effective cooling is formed on the front bearing assembly 17.

In this embodiment, an air inlet of the end cover 5 is provided with an air inlet manifold 9, and the air inlet manifold 9 is communicated with the air cavity 7, so that cooling air can smoothly enter the air cavity 7 through the air inlet manifold 9. The fan 8 is provided on the rotor 16, and thus can be rotated together with the rotor 16, and cooling wind can be easily introduced into the wind chamber 7 without additional power consumption.

In one embodiment, the fan 8 is fixed to one end of the rotor 16 in a sleeved mode, the fan 8 rotates along with the rotation of the rotor 16, and the outer surface of the air guide device 15 is fixed to the inner surface of the end cover 5. The air flow that air ducting 15 middle wind shield piece 83 drove fan 8 divides into two strands, one gets into ventilation channel 84, ventilation channel 84 distributes a plurality ofly at the inner wall circumference of casing 82, wind chamber 7 in the casing 82 links to each other through ventilation channel 84 with air-out lid 85, the cambered surface of the slot air outlet 81 on the air-out lid 85 and the cambered surface of end cover 5 internal surface form a smooth curved surface, air-out cambered surface and end cover internal surface cambered surface rounding off are connected promptly, the camber of this curved surface should not be too big, in order to guarantee that the air flow has better attaches the wall effect.

In this embodiment, the air guiding device 15 and the first cooling channel 2 are used to directly guide the cooling air to the front bearing assembly 17 to cool the front bearing assembly 17, so that the cooling air of the front bearing assembly 17 can be separated from the cooling air duct of the rear bearing assembly and the rotor, thereby realizing reasonable design of the air duct inside the motor, effectively avoiding the problem that the cooling air heated by the temperature of the rotor flows through the front bearing assembly 17, which leads to the problem that the front bearing assembly 17 cannot be effectively cooled or even can be heated, further influencing the problem of the integral temperature rise inside the motor, realizing effective cooling of the front bearing assembly 17, effectively reducing the temperature of the front bearing assembly 17, and improving the stability of the operation of the motor.

In one embodiment, the motor air duct structure further comprises a second cooling channel 10, and an air flow can enter the second cooling channel 10 through the air guide device 15 and cool the rear bearing assembly 18 and the rotor 16 from the second cooling channel 10. In the present embodiment, the second cooling channel 10 includes a gap between the rear bearing assembly 18 and the rotor 16, a gap between the stator 19 and the rotor 16, and the gap between the rear bearing assembly 18 and the rotor 16 is communicated with the gap between the stator 19 and the rotor 16, so as to ensure that cooling wind can flow through the rear bearing assembly 18 and the stator 19 in sequence, thereby effectively cooling the rear bearing assembly 18, the rotor 16 and the stator 19.

In one embodiment, the air volume of the second cooling channel 10 is larger than that of the first cooling channel 2, so that the distribution of the air flow is more consistent with the distribution of the heat of the motor, and the cooling effect of the motor is further improved.

In this embodiment, two cooling air paths are provided inside the motor, wherein the end cover 5 and the casing 1 are provided with a cooling air duct communicating with each other, a jet flow of cooling air is guided to the front bearing assembly 17 to perform impingement cooling on the front bearing assembly 17, and the second cooling channel 10 performs forced air cooling on the rear bearing assembly 18, the rotor 16 and the stator 19, and since the air flow cools the rear bearing assembly 18 and the stator 19 first, adverse effects on the rear bearing assembly 18 caused by air heated by a position with a large heat generation amount of the rotor 16 can be effectively avoided, the cooling effect of the second cooling channel 10 on the rear bearing assembly 18, the rotor 16 and the stator 19 is improved, and the temperature rise inside the motor is effectively reduced.

In one embodiment, the end cap 5 is formed with a convex arc guiding surface 20 at the slit air outlet 81, and the convex arc guiding surface 20 can guide the outlet air of the slit air outlet 81 to the first cooling channel 2. In this embodiment, the flow guide surface with the slit air outlet 81 is connected to the convex arc flow guide surface of the end cover 5, so as to form a continuous flow guide arc surface, thereby after the air flow flows out from the slit air outlet 81, the air flow tends to be adsorbed to the convex surface, under the guiding action of the convex arc flow guide surface 20 of the end cover 5, when the cooling air is blown out from the narrow air outlet of the air guiding device 15, the air speed is fast, the air flow smoothly flows into the first cooling channel 2 along the flow guide of the convex arc surface of the inner surface of the end cover 5 due to the wall attachment effect, and the functions of guiding and reducing the air flow vortex in the end cover 5 are achieved.

In one embodiment, the end cover 5 is provided with a flow guide channel 21 communicating with the first cooling channel 2 at a position connected to the casing 1, and the convex arc flow guide surface 20 guides the air flow into the first cooling channel 2 through the flow guide channel 21. In this embodiment, the diversion channel 21 is disposed at the position of the end cover 5 connected to the housing 1, so that the air outlet of the air guide device 15 can be more conveniently diverted, the diversion efficiency can be improved, and the flow efficiency of the air flow is higher. In this embodiment, in order to facilitate the setting of flow guide channel 21, a plurality of ventilation holes 3 are circumferentially arranged on the inner peripheral wall of the connection position of end cover 5 and casing 1, when flow guide channel 21 is set, ventilation holes 3 can be firstly formed at preset positions, then holes are formed in the ventilation holes 3 from the end face position of end cover 5 towards casing 1, flow guide channel 21 is formed, the position of flow guide channel 21 is aligned with first cooling channel 2, because the setting direction of ventilation holes 3 is the flow direction of the cooling air which is guided by convex arc flow guide surface 20 of end cover 5, therefore, the cooling air which is guided by convex arc flow guide surface 20 of end cover 5 can be guided through ventilation holes 3, the cooling air can be more conveniently guided into first cooling channel 2, and the flow efficiency of the air flow is further improved. In the present embodiment, the vent hole 3 is a blind hole.

In one embodiment, the front side edge of the narrow slit air outlet 81 is connected to the convex arc flow guiding surface 20, and the flow guiding direction of the front side edge of the narrow slit air outlet 81 is tangent to the convex arc flow guiding surface 20 at the connection position, so that the flow guiding effect of the air flow flowing from the narrow slit air outlet 81 to the convex arc flow guiding surface 20 can be further improved, the air flow has a more obvious coanda effect, and the flow guiding efficiency of the air flow is further improved.

In one embodiment, the exhaust hood 14 is sleeved on the outer periphery of the casing 1, the exhaust hood 14 has an annular cavity 22, the exhaust hood 14 is provided with an exhaust main pipe 12, the exhaust main pipe 12 is communicated with the annular cavity 22, the casing 1 is provided with an exhaust port 11, and the first cooling channel 2 and the second cooling channel 10 are communicated with the annular cavity 22 through the exhaust port 11. In the present embodiment, since the first cooling channel 2 and the second cooling channel 10 are communicated with the annular cavity 22 through the air outlet 11, after cooling the front bearing assembly 17, the first cooling channel 2 can enter the annular cavity 22 through the air outlet 11, after cooling the rear bearing assembly 18, the rotor 16 and the stator 19, the second cooling channel 10 can also enter the annular cavity 22 through the air outlet 11, and the air flow entering the annular cavity 22 is exhausted to the outside of the casing 1 through the air exhaust manifold 12, so that the internal heat of the casing 1 is exhausted to the outside of the casing 1, and the cooling of the inside of the casing 1 is realized. The air flow discharged to the outside of the cabinet 1 may be continuously cooled circularly through the air intake manifold 9 after being cooled, or may be directly discharged, and then new cooling air is introduced from the air intake manifold 9 to continuously cool the inside of the cabinet 1.

In one embodiment, the number of the first cooling channels 2 is multiple, the multiple first cooling channels 2 are arranged at intervals along the circumferential direction of the casing 1, and the narrow-slit air outlets 81 may be arranged in one-to-one correspondence with the first cooling channels 2, so as to realize air supply to the first cooling channels 2.

In one embodiment, the housing 1 has a water channel 13 disposed therein, the water channel 13 is disposed along a circumferential direction of the housing 1, and the first cooling channel 2 is at least partially located on an outer circumferential side of the water channel 13. The water channel 13 is located inside the casing 1, and can provide a better cooling effect for the stator 19.

In one embodiment, the first cooling channel 2 includes a first axial section 23, a radial section 24, and a second axial section 25, the first axial section 23 being located axially outward of the waterway 13, the second axial section 25 being located radially outward of the waterway 13, the radial section 24 communicating the first axial section 23 and the second axial section 25. In this embodiment, the first axial section 23 may be disposed along an axial direction of the water channel 13, and since the first axial section 23 is located at an axial outer side of the water channel 13, the first axial section 23 does not interfere with the water channel 13, and meanwhile, since the first axial section 23 and the water channel 13 are disposed along the same axial direction, the thickness of the casing 1 does not need to be increased, the weight of the casing 1 can be reduced, and in addition, the thickness between the first axial section 23 and the inner wall of the casing 1 can be reduced, so that the cooling effect of the first axial section 23 is improved. The second axial section 25 is located at the outer periphery side of the water channel 13, so that the water channel 13 can be avoided, and the radial section 24 is used for facilitating the connection between the first axial section 23 and the second axial section 25, so that the structural arrangement of the first cooling channel 2 is more reasonable, and a better cooling effect can be achieved under the condition of avoiding interference with the water channel 13.

In one embodiment, the outer circumference of the casing 1 is provided with a rib 27 extending in the axial direction, the rib 27 is provided with a radial column 4 at the connecting position of the first axial section 23 and the second axial section 25, the radial column 4 is provided with a radial hole communicated with the radial section 24, and a sealing plug 26 is arranged in the radial hole. In this embodiment, the slit air outlet 81 of the air guiding device 15 is opposite to the channel inlet of the end cover 5, the air guiding channel 21 of the end cover 5 is connected to the first cooling channel 2 on the casing 1, the first cooling channel 2 is for avoiding the casing water channel, a plurality of raised protruding strips 27 are arranged along the circumferential direction of the casing 1, the air outlet of the first cooling channel 2 on the casing 1 is connected to the channel of the front bearing assembly 17, so as to form the cooling channel of the front bearing assembly 17, the front bearing assembly 17 includes a front bearing stator and a front bearing rotor, and after passing through the first cooling channel 2, the cooling air passes through the gap between the front bearing stator and the front bearing rotor, and is finally discharged from the air outlet 11 on the casing 1.

In one embodiment, the exhaust hood 14 is sleeved on the outer periphery side of the casing 1, the exhaust hood 14 has an annular cavity 22, the exhaust hood 14 is provided with an exhaust main pipe 12, the exhaust main pipe 12 is communicated with the annular cavity 22, the casing 1 is provided with an exhaust port 11, the first cooling channel 2 and the second cooling channel 10 are communicated with the annular cavity 22 through the exhaust port 11, the exhaust hood 14 is provided with a mounting groove 28, and the protruding strip 27 is located in the mounting groove 28.

In this embodiment, the hood 14 has an annular chamber 22, such that the interior of the hood 14 is open to facilitate the flow of the air flow through the main exhaust duct 12. The mounting grooves 28 enable the exhaust hood 14 to form an avoiding position of the protruding strips 27, so that the arrangement of the exhaust hood 14 does not affect the arrangement of the protruding strips 27, and the sealing performance between the exhaust hood 14 and the casing 1 can be more effectively ensured.

In one embodiment, the exhaust hood 14 is provided with flanges 29 at both axial sides, and the flanges 29 are attached to the outer wall of the casing 1.

In one embodiment, the flange 29 is fixedly connected to the housing 1 by means of screws. In this embodiment, the flange 29 of the exhaust hood 14 is provided with a threaded hole for fixing with the outer wall of the casing 1 by a bolt, the flange 29 is matched with the outer wall of the passage of the casing 1, and the outer diameter of the threaded hole is smaller than the width of the raised flange 29, so that the exhaust hood 14 can be conveniently assembled on the casing 1.

In one embodiment, a suction pump is connected to the exhaust manifold. The air after centralized cleaning treatment is introduced into the air inlet manifold 9, and is pressurized by the fan 8 to enter the cooling flow channel in the motor, the exhaust hood 14 is arranged outside the exhaust outlet 11 of the casing 1, and the cooled high-temperature gas is extracted by a centralized air extracting pump. The air is pumped out from the exhaust main pipe 12 of the exhaust hood 14 by using the air pump, so that on one hand, the air can be pressurized at the air inlet, and negative pressure is formed at the air outlet, thereby avoiding that air flow directly flows out from the air outlet without passing through a heating part due to narrow space inside the motor; on the other hand, the dust accumulation in the motor is avoided, and the cleanness in the motor is maintained.

The flow of the cooling gas is as follows: the rotor 16 in the magnetic suspension motor rotates at a high speed to drive the fan 8 to rotate, clean cooling gas is pressed into the motor by the fan 8, the cooling gas is divided by the wind shield 83, a part of the cooling gas is blown into the ventilation channel 84 of the wind guide device and then flows out from the narrow-slit air outlet 81 at a high speed through the long and thin slit 6, a pressure difference is formed in the high-speed flowing area of the airflow, and the cooling gas enters the flow guide channel 21 of the end cover 5 along the convex arc flow guide surface 20 on the inner wall of the end cover 5 under the wall attaching effect of the airflow, enters the first cooling channel 2 to the front bearing assembly 17 and cools the front bearing assembly 17. The other part of the air passes through the rear bearing assembly 18 and the rotor 16, exchanges heat with the rear bearing assembly 18 and the rotor 16, is collected with the air cooled by the front bearing assembly 17, is uniformly exhausted into the exhaust hood 14 from the exhaust port 11, and is exhausted from the exhaust main pipe 12.

According to an embodiment of the present application, the magnetic levitation motor includes the air guiding device 15 or the motor air duct structure.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, 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 application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims (26)

1. The air guide device is characterized by comprising an annular shell (82), an air cavity (7) is formed on the inner ring side of the shell (82), a ventilation channel (84) is arranged on the inner peripheral wall of the shell (82), a narrow-slit air outlet (81) is formed in the outer peripheral side of the shell (82), the air cavity (7) is communicated with the narrow-slit air outlet (81) through the ventilation channel (84), and the ventilation area of the ventilation channel (84) is gradually reduced along the flowing direction of air flow.

2. The air guiding device as recited in claim 1, wherein a slit (6) is formed at the tail end of the ventilation channel (84), and the slit air outlet (81) is located at the tail end of the slit (6).

3. The air guiding device as recited in claim 2, wherein the air guiding channel (84) and the air guiding wall surface of the slit (6) are cambered surfaces, and the air guiding wall surface of the air guiding channel (84) is smoothly and transitionally connected with the air guiding wall surface of the slit (6).

4. The air guiding device as recited in claim 1, wherein a wind shielding sheet (83) protruding towards the inner peripheral side of the casing (82) is arranged on the inner peripheral wall of the casing (82), the wind shielding sheet (83) is annular, the wind shielding sheet (83) is located at the rear edge of the air inlet of the ventilation channel (84) and is bent towards the incoming flow direction, and the wind shielding sheet (83) can divide the air flow, so that a part of the air flow enters the ventilation channel (84) and a part of the air flow flows out from the lee side of the wind shielding sheet (83) along the axial direction of the casing (82).

5. The air guiding device as recited in claim 4, wherein the wind deflector (83) includes an outer peripheral flow guiding surface and an inner peripheral flow guiding surface, the outer peripheral flow guiding surface is engaged with a rear side flow guiding wall surface of the ventilation passage (84), the inner peripheral flow guiding surface is connected with an inner peripheral wall of the housing (82), and a distance between the outer peripheral flow guiding surface and the inner peripheral flow guiding surface increases in a direction approaching the inner peripheral wall of the housing (82).

6. The air guide device according to claim 5, wherein the outer circumferential guide surface is in a concave arc shape, and the inner circumferential guide surface is in a convex arc shape.

7. The air guiding device as recited in claim 5, wherein the outer peripheral flow guiding surface is flush with a rear side flow guiding wall surface of the ventilation channel (84) at a connection position, and the outer peripheral flow guiding surface is spliced with the rear side flow guiding wall surface of the ventilation channel (84) to form a smooth arc-shaped flow guiding surface.

8. The air guiding device according to claim 2, wherein an air outlet cover (85) is provided on an outer peripheral side of the casing (82), and the slit (6) is located on the air outlet cover (85).

9. The air guiding device as recited in claim 8, wherein the air outlet covers (85) are arranged at intervals along an outer circumferential direction of the casing (82), the ventilation channels (84) are arranged at intervals along an inner circumferential direction of the casing (82), and one ventilation channel (84) is arranged corresponding to one air outlet cover (85).

10. The air guiding device as recited in claim 2, characterized in that the end of the air outlet cover (85) is bent towards the flow guiding direction to form a bent section, and the slit (6) is located on the bent section.

11. An air duct structure for an electric motor, comprising the air guide device according to any one of claims 1 to 10.

12. The motor air duct structure according to claim 11, further comprising a casing (1), a stator (19), a rotor (16), a fan (8), a front bearing assembly (17), a rear bearing assembly (18), and an end cover (5), wherein the end cover (5) is fixedly connected to the casing (1), the air guiding device (15) is installed in the end cover (5), the fan (8) is fixed to the rotor (16) and is located in an air cavity (7) of the air guiding device (15), a first cooling channel (2) is disposed on the casing (1), and an air flow can enter the first cooling channel (2) through the air guiding device (15) and enter the front bearing assembly (17) through the first cooling channel (2) under the action of the fan (8).

13. The motor air duct structure according to claim 12, characterized in that it further comprises a second cooling channel (10), through which air flow can enter the second cooling channel (10) via the air guiding device (15) and cool the rear bearing assembly (18) and the rotor (16) from the second cooling channel (10).

14. The motor air duct structure according to claim 12, wherein the end cover (5) is formed with a convex arc diversion surface (20) at the narrow slit air outlet (81), and the convex arc diversion surface (20) can divert the outlet air of the narrow slit air outlet (81) to the first cooling channel (2).

15. The motor air duct structure according to claim 14, wherein the end cover (5) is provided with a flow guide channel (21) communicating with the first cooling channel (2) at a position connected to the casing (1), and the convex arc flow guide surface (20) guides the air flow into the first cooling channel (2) through the flow guide channel (21).

16. The motor air duct structure according to claim 14, wherein the front side edge of the narrow slit air outlet (81) is engaged with the convex arc guiding surface (20), and the front side edge guiding direction of the narrow slit air outlet (81) is tangential to the convex arc guiding surface (20) at the engaged position.

17. The motor air duct structure according to claim 12, characterized in that an exhaust hood (14) is sleeved on the outer peripheral side of the casing (1), the exhaust hood (14) has an annular cavity (22), an exhaust main pipe (12) is arranged on the exhaust hood (14), the exhaust main pipe (12) is communicated with the annular cavity (22), an exhaust outlet (11) is arranged on the casing (1), and the first cooling channel (2) and the second cooling channel (10) are communicated with the annular cavity (22) through the exhaust outlet (11).

18. The motor air duct structure according to claim 12, wherein the first cooling channel (2) is plural, and the plural first cooling channels (2) are arranged at intervals along the circumferential direction of the casing (1).

19. The electric motor air duct structure according to claim 12, wherein the casing (1) has a water channel (13) built therein, the water channel (13) is provided along a circumferential direction of the casing (1), and the first cooling passage (2) is at least partially located on an outer circumferential side of the water channel (13).

20. The electric machine air duct structure according to claim 19, characterized in that the first cooling channel (2) comprises a first axial section (23), a radial section (24) and a second axial section (25), the first axial section (23) being located axially outside the water channel (13), the second axial section (25) being located on an outer circumferential side of the water channel (13), the radial section (24) communicating the first axial section (23) and the second axial section (25).

21. The electric motor air duct structure according to claim 20, characterized in that the outer circumference of the casing (1) is provided with a rib (27) extending in the axial direction, the rib (27) is provided with a radial column (4) at the connecting position of the first axial section (23) and the second axial section (25), the radial column (4) is provided with a radial hole communicating with the radial section (24), and a sealing plug (26) is arranged in the radial hole.

22. The motor air duct structure according to claim 21, wherein an exhaust hood (14) is sleeved on an outer peripheral side of the casing (1), the exhaust hood (14) has an annular cavity (22), an exhaust main pipe (12) is arranged on the exhaust hood (14), the exhaust main pipe (12) is communicated with the annular cavity (22), an exhaust outlet (11) is arranged on the casing (1), the first cooling channel (2) and the second cooling channel (10) are communicated with the annular cavity (22) through the exhaust outlet (11), a mounting groove (28) is arranged on the exhaust hood (14), and the protruding strip (27) is located in the mounting groove (28).

23. The motor air duct structure according to claim 22, characterized in that the exhaust hood (14) is provided with folded edges (29) at two axial sides, and the folded edges (29) are attached to the outer wall of the casing (1).

24. The motor air duct structure according to claim 23, characterized in that the folded edge (29) is fixedly connected with the casing (1) by a screw.

25. The motor wind tunnel structure according to claim 17 or 22, wherein a suction pump is connected to the exhaust manifold.

26. A magnetic levitation motor, comprising the air guide device (15) of any one of claims 1 to 10 or the motor air duct structure of any one of claims 11 to 25.

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