Air guiding device, motor air duct structure and maglev motor

Abstract

The present application provides an air guiding device, a motor air duct structure and a magnetic levitation motor. The air guiding device includes an annular housing (82). An air cavity (7) is formed on the inner ring side of the housing (82). A ventilation channel (84) is provided on the inner peripheral wall of the housing (82). A narrow slit air outlet (81) is provided on the outer peripheral side of the housing (82). The air cavity (7) is communicated with the narrow slit air outlet (81) through the ventilation channel (84). Along the flowing direction of the air flow, the ventilation area of the ventilation channel (84) decreases. According to the air guiding device of the present application, the flowing direction of the air flow can be effectively restricted, the air flow velocity can be increased, and the utilization rate of the cooling air can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and particularly to a wind guiding device, a motor air duct structure, and a magnetic levitation motor. Background Art

[0002] Currently, the cooling methods commonly used for permanent magnet synchronous motors in magnetic levitation air compressors are usually water cooling and air cooling. The stator of the motor relies on water cooling on the casing, and the rotor and bearings rely on air cooling. However, the permanent magnet synchronous motor is small in size, has a limited heat dissipation area, and has a large internal air resistance. On the one hand, even if a ventilation channel is opened at the bearing position, due to the influence of resistance, the cooling air is difficult to pass through the opened ventilation channel as required and will flow out from the air outlet of the casing. On the other hand, the motor has a high speed and a large power, and the wind friction loss and eddy current loss of the rotor are very large, resulting in a relatively high temperature rise of the rotor. The air heated after cooling the rotor then flows through the bearings, which may heat the bearings and further affect the overall temperature rise inside the motor.

[0003] The air cooling of the motor relies on the reserved air ducts for each route for cooling, but the direction of the air flow is uncontrollable. The air flow will be in a diffused state when flowing through the expansion section, and the flow rate will decrease, resulting in a low utilization rate of the cooling air. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a wind guiding device, a motor air duct structure, and a magnetic levitation motor, which can effectively restrict the flow direction of the air flow, increase the air flow rate, and improve the utilization rate of the cooling air.

[0005] To solve the above problems, the present application provides a wind guiding device, including an annular casing. An air cavity is formed on the inner ring side of the casing. Ventilation channels are provided on the inner peripheral wall of the casing. Narrow slit air outlets are provided on the outer peripheral side of the casing. The air cavity is communicated with the narrow slit air outlets through the ventilation channels. Along the air flow direction, the ventilation area of the ventilation channels decreases.

[0006] Preferably, a slit is provided at the end of the ventilation channel, and the narrow slit air outlet is located at the end of the slit.

[0007] Preferably, the guiding wall surfaces of the ventilation channels and the slit are arc-shaped, and the guiding wall surface of the ventilation channel is smoothly connected to the guiding wall surface of the slit in a smooth transition.

[0008] Preferably, the inner peripheral wall of the casing is provided with wind blocking pieces protruding towards the inner peripheral side of the casing. The wind blocking pieces are annular. The wind blocking pieces are located at the trailing edge of the air inlet of the ventilation channel and are bent towards the oncoming flow direction. The wind blocking pieces can split the air flow, so that a part of the air flow enters the ventilation channel, and a part of the air flow flows out along the axial direction of the casing on the leeward side of the wind blocking pieces.

[0009] Preferably, the wind deflector includes an outer peripheral flow guiding surface and an inner peripheral flow guiding surface. The outer peripheral flow guiding surface is connected to the rear side flow guiding wall surface of the ventilation channel, and the inner peripheral flow guiding surface is connected to the inner peripheral wall of the housing. Along the direction close to the inner peripheral wall of the housing, the interval between the outer peripheral flow guiding surface and the inner peripheral flow guiding surface increases.

[0010] Preferably, the outer peripheral flow guiding surface is concave arc-shaped, and the inner peripheral flow guiding surface is convex arc-shaped.

[0011] Preferably, the outer peripheral flow guiding surface is flush with the rear side flow guiding wall surface of the ventilation channel at the connection position, and the outer peripheral flow guiding surface and the rear side flow guiding wall surface of the ventilation channel are spliced to form a smooth arc-shaped flow guiding surface.

[0012] Preferably, an air outlet cover is provided on the outer periphery side of the housing, and the slit is located on the air outlet cover.

[0013] Preferably, the air outlet covers are arranged at intervals along the circumferential direction of the outer periphery of the housing, and the ventilation channels are arranged at intervals along the circumferential direction of the inner periphery of the housing. One ventilation channel is provided corresponding to one air outlet cover.

[0014] Preferably, the end of the air outlet cover is bent towards the flow guiding direction to form a bent section, and the slit is located on the bent section.

[0015] According to another aspect of the present application, a motor air duct structure is provided, including the above-mentioned air guiding device.

[0016] Preferably, the motor air duct structure further includes a housing, a stator, a rotor, a fan, a front bearing assembly, a rear bearing assembly and an end cover. The end cover is fixedly connected to the housing. The air guiding device is installed in the end cover. The fan is fixed on the rotor and is located in the air cavity of the air guiding device. A first cooling channel is provided on the housing. The air flow can enter the first cooling channel through the air guiding device under the action of the fan and enter the front bearing assembly through the first cooling channel.

[0017] Preferably, the motor air duct structure further includes a second cooling channel. The air flow can enter the second cooling channel through the air guiding device and cool the rear bearing assembly and the rotor from the second cooling channel.

[0018] Preferably, a convex arc-shaped flow guiding surface is formed at the narrow slit air outlet of the end cover, and the convex arc-shaped flow guiding surface can guide the air flow out of the narrow slit air outlet to the first cooling channel.

[0019] Preferably, a flow guiding channel communicating with the first cooling channel is provided at the position where the end cover is connected to the housing, and the convex arc-shaped flow guiding surface guides the air flow into the first cooling channel through the flow guiding channel.

[0020] Preferably, the front side edge of the narrow slit air outlet is connected to the convex arc-shaped flow guiding surface, and the front side edge guiding direction of the narrow slit air outlet is tangent to the convex arc-shaped flow guiding surface at the connection position.

[0021] Preferably, an exhaust hood is sleeved on the outer peripheral side of the casing. The exhaust hood has an annular cavity. An exhaust main pipe is arranged on the exhaust hood and is communicated with the annular cavity. An air exhaust port is arranged on the casing. The first cooling channel and the second cooling channel are communicated with the annular cavity through the air exhaust port.

[0022] Preferably, there are a plurality of first cooling channels, and the plurality of first cooling channels are arranged at intervals along the circumferential direction of the casing.

[0023] Preferably, a water channel is arranged inside the casing. The water channel is arranged along the circumferential direction of the casing. At least part of the first cooling channel is located on the outer peripheral side of the water channel.

[0024] Preferably, the first cooling channel includes a first axial section, a radial section and a second axial section. The first axial section is located axially outside the water channel. The second axial section is located on the outer peripheral side of the water channel. The radial section communicates the first axial section and the second axial section.

[0025] Preferably, a convex strip extending axially is arranged on the outer periphery of the casing. A radial column is arranged at the connection position of the first axial section and the second axial section of the convex strip. A radial hole communicated with the radial section is arranged on the radial column, and a sealing plug is arranged in the radial hole.

[0026] Preferably, an exhaust hood is sleeved on the outer peripheral side of the casing. The exhaust hood has an annular cavity. An exhaust main pipe is arranged on the exhaust hood and is communicated with the annular cavity. An air exhaust port is arranged on the casing. The first cooling channel and the second cooling channel are communicated with the annular cavity through the air exhaust port. An installation groove is arranged on the exhaust hood, and the convex strip is located in the installation groove.

[0027] Preferably, flanges are arranged on both axial sides of the exhaust hood, and the flanges are attached to the outer wall of the casing.

[0028] Preferably, the flanges are fixedly connected to the casing by screws.

[0029] Preferably, an air extraction pump is connected to the exhaust main pipe.

[0030] According to another aspect of the present application, a magnetic levitation motor is provided, including the above-mentioned air guiding device or the above-mentioned motor air duct structure.

[0031] The air guiding device provided by this application includes an annular housing. An air cavity is formed on the inner ring side of the housing. Ventilation channels are provided on the inner peripheral wall of the housing, and narrow slit air outlets are provided on the outer peripheral side of the housing. The air cavity is communicated with the narrow slit air outlets through the ventilation channels. Along the flowing direction of the air flow, the ventilation area of the ventilation channels decreases. This air guiding device can utilize the characteristic of the decreasing ventilation area of the ventilation channels, so that during the process of the air flow flowing out from the ventilation channels through the narrow slit air outlets, it enters a narrow space from a broad space, enabling the mutually extruded air to jet out from the slender narrow slit air outlets, which can achieve the concentrated flow of the air flow, effectively restrict the flowing direction of the air flow, avoid the dispersion of the air flow, and at the same time can accelerate the flow rate of the air flow and improve the utilization efficiency of the cooling air. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of a magnetic levitation motor according to an embodiment of this application;

[0033] Figure 2 is Figure 1 an enlarged structural diagram of part A of

[0034] Figure 3 It is a three-dimensional structural diagram of a magnetic levitation motor according to an embodiment of this application;

[0035] Figure 4 It is a three-dimensional structural diagram of an air guiding device according to an embodiment of this application;

[0036] Figure 5 It is a schematic diagram of the air flow structure of an air guiding device according to an embodiment of this application;

[0037] Figure 6 It is a three-dimensional structural diagram of an exhaust hood according to an embodiment of this application.

[0038] The reference signs are shown as:

[0039] 1. Machine housing; 2. First cooling channel; 3. Ventilation hole; 4. Radial column; 5. End cover; 6. Slit; 7. Air cavity; 8. Fan; 9. Intake main pipe; 10. Second cooling channel; 11. Air outlet; 12. Exhaust main pipe; 13. Water channel; 14. Exhaust hood; 15. Air guiding device; 16. Rotor; 17. Front bearing assembly; 18. Rear bearing assembly; 19. Stator; 81. Narrow slit air outlet; 82. Housing; 83. Windshield; 84. Ventilation channel; 85. Air outlet cover; 20. Convex arc guiding surface; 21. Guiding channel; 22. Annular cavity; 23. First axial section; 24. Radial section; 25. Second axial section; 26. Sealing plug; 27. Convex strip; 28. Installation groove; 29. Flange. Detailed Embodiments

[0040] Refer to in combination Figures 1 to 6As shown, according to an embodiment of the present application, the air guiding device includes an annular housing 82. An air cavity 7 is formed on the inner ring side of the housing 82. A ventilation channel 84 is provided on the inner peripheral wall of the housing 82. A narrow slit air outlet 81 is provided on the outer peripheral side of the housing 82. The air cavity 7 is communicated with the narrow slit air outlet 81 through the ventilation channel 84. Along the flowing direction of the air flow, the ventilation area of the ventilation channel 84 decreases gradually.

[0041] This air guiding device can utilize the characteristic that the ventilation area of the ventilation channel 84 decreases gradually, so that during the process of the air flow flowing out from the ventilation channel 84 through the narrow slit air outlet 81, the air flow enters a narrow space from a broad space, and the mutually extruded air jets out from the slender narrow slit air outlet 81, which can realize the concentrated flow of the air flow, guide and boost the direction of the air flow, change the irregular air flow into a regular air flow, effectively restrict the flow direction of the air flow, avoid the dispersion of the air flow, and at the same time can accelerate the flow rate of the air flow and improve the utilization efficiency of the cooling air.

[0042] The narrow slit air outlet 81 here refers to an air outlet on the outer peripheral side of the housing 82 that is in a long strip shape, such as Figure 4 As shown, the circumferential length of the narrow slit air outlet 81 is greater than the axial height. In some embodiments, the ratio range of the circumferential length to the axial height is 5-20.

[0043] In one embodiment, a slit 6 is provided at the end of the ventilation channel 84, and the narrow slit air outlet 81 is located at the end of the slit 6. In this embodiment, the length of the slit 6 in the circumferential direction is the same as or greater than the circumferential length of the narrow slit air outlet 81, and extends a certain distance along the flowing direction of the air flow, so that the air flow coming from the ventilation channel 84 can be extruded through a sufficient distance, thereby obtaining a better air flow adjustment effect. The slit 6 here refers to a narrow slit whose circumferential length is greater than the axial height, and the purpose is to cooperate with the high-speed air flow and the convex arc surface, so that it is easier for the air flow to form the Coanda effect and achieve the wall attachment flow effect after flowing out of the slit 6. In some embodiments, the ratio range of the circumferential length to the axial height of the slit 6 can be limited to 4-25.

[0044] In one embodiment, the guiding wall surfaces of the ventilation channel 84 and the slit 6 are in an arc shape, and the guiding wall surface of the ventilation channel 84 is smoothly connected to the guiding wall surface of the slit 6 in a smooth transition. In this embodiment, the guiding wall surfaces of the ventilation channel 84 and the slit 6 cooperate to form a convex arc surface with a certain curvature. The Coanda effect states that when a high-pressure air flow passes through a convex surface with a curvature, due to the air pressure difference, the air flow will be adsorbed to the curved surface and flow along the curved arc. Part of the high-speed rotating air enters the broad ventilation channel 84, the mutually extruded air passes through the slender slit 6, and finally jets out from the narrow slit air outlet 81. By utilizing the Coanda effect of the air flow, the air flow is guided to the preset position.

[0045] In one embodiment, a windshield 83 protruding toward the inner peripheral side of the housing 82 is provided on the inner peripheral wall of the housing 82. The windshield 83 is annular, located at the trailing edge of the air inlet of the ventilation passage 84, and bent toward the oncoming flow direction. The windshield 83 can split the air flow, so that a part of the air flow enters the ventilation passage 84, and a part of the air flow flows out axially along the backwind side of the windshield 83 along the housing 82.

[0046] In this embodiment, by providing the windshield 83, the air flow entering the air cavity 7 can be split, so that a part of the air flow can flow along the diversion of the ventilation passage 84, and the other part of the air can flow axially along the inner ring passage of the housing 82, thereby realizing the air flow guiding in different directions, realizing the air flow cooling at different positions, meeting the cooling requirements at different positions, and improving the cooling efficiency.

[0047] In one embodiment, the windshield 83 includes an outer peripheral diversion surface and an inner peripheral diversion surface. The outer peripheral diversion surface is connected to the rear diversion wall surface of the ventilation passage 84, and the inner peripheral diversion surface is connected to the inner peripheral wall of the housing 82. Along the direction close to the inner peripheral wall of the housing 82, the interval between the outer peripheral diversion surface and the inner peripheral diversion surface increases. In this embodiment, the cross-section of the windward side of the windshield 83 is the smallest, forming a windward tip, which can reduce the flow resistance when the air flow passes through the windshield 83, while ensuring the splitting effect of the windshield 83, improving the air flow efficiency, and reducing the flow loss of the air flow.

[0048] In one embodiment, the outer peripheral diversion surface is concave arc-shaped, and the inner peripheral diversion surface is convex arc-shaped, which can make the outer peripheral diversion surface of the windshield 83 divert the air flow, so that a large amount of the air flow enters the ventilation passage 84 under the diversion action of the concave arc surface of the outer peripheral diversion surface, and at the same time, the arc-shaped diversion effect of the outer peripheral diversion surface is used to reduce the flow loss of the air flow turning and flowing.

[0049] In one embodiment, the outer peripheral diversion surface is flush with the rear diversion wall surface of the ventilation passage 84 at the connection position, and the outer peripheral diversion surface and the rear diversion wall surface of the ventilation passage 84 are spliced to form a smooth arc-shaped diversion surface. When the air flow flows along the outer peripheral diversion surface, it can directly flow along the outer peripheral diversion surface to the rear diversion wall surface of the ventilation passage 84, and then flow along the rear diversion wall surface of the ventilation passage 84 to the slit 6. Since the outer peripheral diversion surface and the rear diversion wall surface of the ventilation passage 84 are spliced to form a smooth arc-shaped diversion surface, the air flow will not be subject to flow resistance during the process of flowing along the diversion surface, and the air flow efficiency can be further improved.

[0050] In one embodiment, an air outlet cover 85 is provided on the outer peripheral side of the housing 82, and the slit 6 is located on the air outlet cover 85. In this embodiment, the air outlet cover 85 is part of the housing 82. By providing the air outlet cover 85, it is convenient to arrange the slit 6 and the narrow slit air outlet 81.

[0051] In one embodiment, the air outlet covers 85 are arranged at intervals along the outer circumference of the housing 82, and the ventilation channels 84 are arranged at intervals along the inner circumference of the housing 82. One ventilation channel 84 is provided corresponding to one air outlet cover 85. In this embodiment, the air outlet covers 85 are evenly spaced along the circumference of the housing 82. While ensuring that the ventilation channels 84 and the slit 6 can be conveniently arranged, the material consumption of the air outlet cover 85 can be reduced according to the structures of the ventilation channels 84 and the slit 6, the material cost can be lowered, and the overall mass of the air guiding device can be reduced.

[0052] In one embodiment, the end of the air outlet cover 85 is bent towards the air guiding direction to form a bent section, and the slit 6 is located on the bent section. In this embodiment, by adding the bent section, without excessively increasing the axial length of the air outlet cover 85, there is sufficient space for arranging the ventilation channels 84 and the slit 6. The structures of the ventilation channels 84 and the slit 6 can be reasonably designed to ensure that the guiding wall surfaces of the ventilation channels 84 and the slit 6 can have a smooth transition, and the air flow guiding of the slit 6 can form a good connection relationship with the outer guiding surface, making it more convenient to achieve the air flow attachment effect. Since the air outlet cover 85 only needs to be provided with a bent section at the position corresponding to the slit 6, the structure added to meet the arrangement of the slit 6 can be reduced, and the overall mass of the housing 82 can be lowered.

[0053] During the operation of the air guiding device, the cooling air is pressed into from the ventilation channel 84 with a larger space, forcing the cooling air to "leak" from the slit 6. After a period of time, the air outlet pressure will be enhanced, making the air flow velocity of the air outlet faster. The air flowing out from the narrow slit air outlet 81 needs a certain air speed to exhibit the Coanda effect. Therefore, this air guiding device is particularly suitable for high-speed rotating motors.

[0054] Combined with reference to Figures 1 to 6 As shown, according to the embodiment of the present application, the motor air duct structure includes the above-mentioned air guiding device.

[0055] In one embodiment, the motor air duct structure further includes a housing 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. The end cover 5 is fixedly connected to the housing 1. The air guiding device 15 is installed in the end cover 5. The fan 8 is fixed on the rotor 16 and is located in the air cavity 7 of the air guiding device 15. A first cooling channel 2 is provided on the housing 1, and the air flow can enter the first cooling channel 2 through the air guiding device 15 under the action of the fan 8 and enter the front bearing assembly 17 through the first cooling channel 2.

[0056] In this embodiment, the wind deflector 83 in the air guiding device 15 diverts the cooling air. A part of the cooling air enters the gap between the rotor 16 and other components, and a part enters the air cavity 7 of the housing 82 of the air guiding device 15. The air outlet guiding surface of the air guiding device 15 and the inner surface of the end cover are in a smooth curved surface at the connection position. Utilizing the wall attachment effect of the air flow, when the air flow passes through a convex surface with a certain curvature, there is a tendency to adsorb to the convex surface. When the cooling air passes through the narrow slit air outlet 81 of the air guiding device 15, the wind speed is relatively fast. Due to the wall attachment effect, the air flow flows into the first cooling channel 2 along the arc surface of the inner surface of the end cover, playing a role in guiding the air flow and reducing the air flow vortices in the end cover 5, thereby reducing the air flow loss, reducing the air flow noise, increasing the air flow speed, and effectively cooling the front bearing assembly 17.

[0057] In this embodiment, an intake main pipe 9 is provided at the air inlet of the end cover 5. The intake main pipe 9 is communicated with the air cavity 7, so that the cooling air can smoothly enter the air cavity 7 through the intake main pipe 9. The fan 8 is arranged on the rotor 16, so it can rotate together with the rotor 16 without consuming additional power, and can conveniently introduce the cooling air into the air cavity 7.

[0058] In one embodiment, the fan 8 is fixed to one end of the rotor 16 by hot sleeving. The fan 8 rotates with the rotation of the rotor 16, and the outer surface of the air guiding device 15 is fixed to the inner surface of the end cover 5. The wind deflector 83 in the air guiding device 15 divides the air flow driven by the fan 8 into two parts. One part enters the ventilation channels 84. A plurality of ventilation channels 84 are circumferentially distributed on the inner wall of the housing 82. The air cavity 7 in the housing 82 is connected to the air outlet cover 85 through the ventilation channels 84. The arc surface of the narrow slit air outlet 81 on the air outlet cover 85 and the arc surface of the inner surface of the end cover 5 form a smooth curved surface, that is, the air outlet arc surface and the inner surface arc of the end cover are smoothly connected in a transitional manner. The curvature of this curved surface should not be too large to ensure that the air flow has a good wall attachment effect.

[0059] 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. Therefore, the cooling air of the front bearing assembly 17 can be separated from the cooling air ducts of the rear bearing assembly and the rotor, realizing a reasonable design of the internal air ducts of the motor, effectively avoiding the cooling air heated by the rotor temperature from flowing through the front bearing assembly 17, resulting in the front bearing assembly 17 not being effectively cooled or even being heated, and further affecting the overall temperature rise inside the motor. The effective cooling of the front bearing assembly 17 is realized, the temperature of the front bearing assembly 17 is effectively reduced, and the operation stability of the motor is improved.

[0060] In one embodiment, the motor air duct structure further includes a second cooling channel 10. Airflow can enter the second cooling channel 10 through the air guiding device 15 and cool the rear bearing assembly 18 and the rotor 16 from the second cooling channel 10. In this embodiment, the second cooling channel 10 includes the gap between the rear bearing assembly 18 and the rotor 16 and the gap between the stator 19 and the rotor 16. 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 to ensure that the cooling air can flow through the rear bearing assembly 18 and the stator 19 in sequence, so as to effectively cool the rear bearing assembly 18, the rotor 16 and the stator 19.

[0061] In one embodiment, the air volume of the second cooling channel 10 is greater than that of the first cooling channel 2, so that the distribution of the airflow is more in line with the distribution of the motor heat, and further improves the cooling effect of the motor.

[0062] In this embodiment, two cooling air paths are arranged inside the motor. The cooling air ducts communicated with each other are arranged on the end cover 5 and the housing 1 to guide the cooling air jet to the front bearing assembly 17 for impinging cooling. The second cooling channel 10 performs forced air cooling on the rear bearing assembly 18, the rotor 16 and the stator 19. Since the airflow cools the rear bearing assembly 18 first and then the stator 19, it can effectively avoid the adverse effect of the air heated by the position with a large heat generation of the rotor 16 on the rear bearing assembly 18, improve the cooling effect of the second cooling channel 10 on the rear bearing assembly 18, the rotor 16 and the stator 19, and effectively reduce the temperature rise inside the motor.

[0063] In one embodiment, the end cover 5 forms a convex arc guiding surface 20 at the narrow slit air outlet 81. The convex arc guiding surface 20 can guide the air flowing out of the narrow slit air outlet 81 to the first cooling channel 2. In this embodiment, by connecting the guiding surface of the narrow slit air outlet 81 with the convex arc guiding surface of the end cover 5, a continuous guiding arc surface can be formed. Thus, after the airflow flows out of the narrow slit air outlet 81, it has a tendency to adsorb to the convex surface. Under the guiding action of the convex arc guiding surface 20 of the end cover 5, when the cooling air blows out from the narrow air outlet of the air guiding device 15, the wind speed is relatively fast, and due to the wall attachment effect, the airflow smoothly flows into the first cooling channel 2 along the convex arc surface of the inner surface of the end cover 5, playing a role in guiding and reducing the air flow vortex inside the end cover 5.

[0064] In one embodiment, a diversion channel 21 communicating with the first cooling channel 2 is provided at the position where the end cover 5 is connected to the casing 1. The convex arc diversion surface 20 introduces the air flow into the first cooling channel 2 through the diversion channel 21. In this embodiment, by providing the diversion channel 21 at the position where the end cover 5 is connected to the casing 1, it is more convenient to divert the air discharged from the air guiding device 15, which can improve the diversion efficiency and make the air flow more efficient. In this embodiment, for the convenience of setting the diversion channel 21, a plurality of ventilation holes 3 are circumferentially provided on the inner peripheral wall at the connection position between the end cover 5 and the casing 1. When setting the diversion channel 21, the ventilation holes 3 can be first opened at the preset positions, and then holes are drilled from the end face position of the end cover 5 facing the casing 1 to the ventilation holes 3 to form the diversion channel 21. The position of the diversion channel 21 is aligned with the first cooling channel 2. Since the setting direction of the ventilation holes 3 is the flowing direction of the cooling air diverted by the convex arc diversion surface 20 of the end cover 5, the cooling air diverted by the convex arc diversion surface 20 of the end cover 5 can be diverted through the ventilation holes 3, and it is more convenient to introduce the cooling air into the first cooling channel 2, further improving the air flow efficiency. In this embodiment, the ventilation holes 3 are blind holes.

[0065] In one embodiment, the front edge of the narrow slit air outlet 81 is connected to the convex arc diversion surface 20, and the diversion direction of the front edge of the narrow slit air outlet 81 is tangent to the convex arc diversion surface 20 at the connection position, which can further improve the diversion effect when the air flow flows from the narrow slit air outlet 81 to the convex arc diversion surface 20, making the air flow have a more obvious Coanda effect and further improving the air diversion efficiency.

[0066] In one embodiment, an exhaust hood 14 is sleeved on the outer periphery of the casing 1. The exhaust hood 14 has an annular cavity 22. An exhaust main pipe 12 is provided on the exhaust hood 14, and the exhaust main pipe 12 communicates with the annular cavity 22. An exhaust port 11 is provided on the casing 1. The first cooling channel 2 and the second cooling channel 10 communicate with the annular cavity 22 through the exhaust port 11. In this embodiment, since the first cooling channel 2 and the second cooling channel 10 communicate with the annular cavity 22 through the exhaust port 11, the first cooling channel 2 can enter the annular cavity 22 through the exhaust port 11 after cooling the front bearing assembly 17. After the second cooling channel 10 cools the rear bearing assembly 18, the rotor 16 and the stator 19, it can also enter the annular cavity 22 through the exhaust port 11. The air flow entering the annular cavity 22 is discharged outside the casing 1 through the exhaust main pipe 12, thereby discharging the internal heat of the casing 1 outside the casing 1 and realizing the cooling inside the casing 1. The air flow discharged outside the casing 1 can continue to circulate and cool after cooling through the intake main pipe 9, or can be directly discharged, and then new cooling air is introduced from the intake main pipe 9 to continue the internal cooling of the casing 1.

[0067] In one embodiment, there are multiple first cooling channels 2, and the multiple first cooling channels 2 are arranged at intervals along the circumferential direction of the housing 1. The narrow slit air outlets 81 can be arranged in one-to-one correspondence with the first cooling channels 2 to realize air supply to each first cooling channel 2.

[0068] In one embodiment, a water channel 13 is provided inside the housing 1. The water channel 13 is arranged along the circumferential direction of the housing 1, and at least a part of the first cooling channel 2 is located on the outer peripheral side of the water channel 13. The water channel 13 is located inside the housing 1, which can form a better cooling effect on the stator 19.

[0069] 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 is located axially outside the water channel 13, the second axial section 25 is located on the outer peripheral side of the water channel 13, and the radial section 24 connects the first axial section 23 and the second axial section 25. In this embodiment, the first axial section 23 can be arranged along the axial direction of the water channel 13. Since the first axial section 23 is located axially outside the water channel 13, it will not interfere with the water channel 13. At the same time, since the first axial section 23 and the water channel 13 are arranged along the same axis, it is not necessary to increase the thickness of the housing 1, which can reduce the weight of the housing 1. In addition, the thickness between the first axial section 23 and the inner wall of the housing 1 can also be reduced, improving the cooling effect of the first axial section 23. The second axial section 25 is located on the outer peripheral side of the water channel 13, so it can also avoid the water channel 13, and the radial section 24 is for facilitating the connection between the first axial section 23 and the second axial section 25, making the structural arrangement of the first cooling channel 2 more reasonable. Without interfering with the water channel 13, it can have a better cooling effect.

[0070] In one embodiment, a convex strip 27 extending axially is provided on the outer periphery of the housing 1. A radial column 4 is provided at the connection position of the convex strip 27 at the connection position of the first axial section 23 and the second axial section 25. A radial hole communicating with the radial section 24 is provided on the radial column 4, and a sealing plug 26 is provided in the radial hole. In this embodiment, the narrow slit air outlet 81 of the air guiding device 15 faces the channel inlet of the end cover 5. The diversion channel 21 of the end cover 5 is connected to the first cooling channel 2 on the housing 1. To avoid the housing water channel, multiple raised convex strips 27 are arranged along the circumferential direction of the housing 1 for the first cooling channel 2 on the housing 1. The air outlet of the first cooling channel 2 on the housing 1 is connected to the channel of the front bearing assembly 17, forming the cooling channel of the front bearing assembly 17. The front bearing assembly 17 includes a front bearing stator and a front bearing rotor. After the cooling air passes through the first cooling channel 2, it passes through the gap between the front bearing stator and the front bearing rotor, and finally is discharged from the air outlet 11 on the housing 1.

[0071] In one embodiment, an exhaust hood 14 is sleeved on the outer peripheral side of the housing 1. The exhaust hood 14 has an annular cavity 22. An exhaust main pipe 12 is provided on the exhaust hood 14. The exhaust main pipe 12 communicates with the annular cavity 22. An exhaust port 11 is provided on the housing 1. The first cooling channel 2 and the second cooling channel 10 communicate with the annular cavity 22 through the exhaust port 11. An installation groove 28 is provided on the exhaust hood 14, and the rib 27 is located in the installation groove 28.

[0072] In this embodiment, the exhaust hood 14 has an annular cavity 22, making the inside of the exhaust hood 14 communicate with each other, facilitating the flow and transmission of air flow and facilitating the air flow to be discharged through the exhaust main pipe 12. The installation groove 28 can form an avoidance position for the rib 27 on the exhaust hood 14, so that the setting of the exhaust hood 14 will not affect the setting of the rib 27, and can more effectively ensure the sealing performance between the exhaust hood 14 and the housing 1.

[0073] In one embodiment, flanges 29 are provided on both axial sides of the exhaust hood 14, and the flanges 29 are attached to the outer wall of the housing 1.

[0074] In one embodiment, the flange 29 is fixedly connected to the housing 1 by screws. In this embodiment, threaded holes are provided in the flange 29 of the exhaust hood 14 and can be fixed to the outer wall of the housing 1 with bolts. The flange 29 cooperates with the outer wall of the channel of the housing 1. The outer diameter of the threaded hole is smaller than the width of the protruding flange 29, facilitating the assembly of the exhaust hood 14 on the housing 1.

[0075] In one embodiment, an air extraction pump is connected to the exhaust main pipe. The intake main pipe 9 introduces the air after centralized cleaning treatment, which is pressurized by the fan 8 and enters the internal cooling channel of the motor. An exhaust hood 14 is provided outside the exhaust port 11 of the housing 1, and the cooled high-temperature gas is centrally extracted by the air extraction pump. The air extraction pump is used to extract air at the exhaust main pipe 12 of the exhaust hood 14. On the one hand, it can pressurize at the air inlet and form a negative pressure at the air outlet, avoiding the direct flow of air from the air outlet without passing through the heat-generating components due to the narrow internal space of the motor; on the other hand, it also avoids the accumulation of dust inside the motor, which is beneficial to maintaining the cleanliness inside the motor.

[0076] The flow of the cooling gas is as follows: The rotor 16 in the magnetic levitation motor rotates at a high speed, driving the fan 8 to rotate. The fan 8 presses clean cooling gas into the motor. The cooling gas is shunted by the wind deflector 83. Part of it is blown into the ventilation channel 84 of the air guiding device, and then flows out at a high speed from the narrow slit air outlet 81 through the slender slit 6. A pressure difference is formed in the area where the air flow is flowing at a high speed. Due to the wall attachment effect of the air flow, it enters the diversion channel 21 of the end cover 5 along the convex arc diversion surface 20 on the inner wall of the end cover 5, enters the first cooling channel 2 to the front bearing assembly 17, and cools the front bearing assembly 17. The other part passes through the rear bearing assembly 18 and the rotor 16, exchanges heat with the rear bearing assembly 18 and the rotor 16, and then merges with the gas after cooling the front bearing assembly 17, and is uniformly discharged from the air outlet 11 into the exhaust hood 14, and then discharged by the exhaust main pipe 12.

[0077] According to an embodiment of the present application, the magnetic levitation motor includes the above-mentioned air guiding device 15 or the above-mentioned motor air duct structure.

[0078] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned various advantageous ways can be freely combined and superimposed.

[0079] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present application, several improvements and variations can still be made, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. An air guiding device, characterized in that, It includes an annular housing (82). An air chamber (7) is formed on the inner ring side of the housing (82). A ventilation channel (84) is provided on the inner peripheral wall of the housing (82). A narrow slit air outlet (81) is provided on the outer peripheral side of the housing (82). The air chamber (7) is communicated with the narrow slit air outlet (81) through the ventilation channel (84). Along the flowing direction of the air flow, the ventilation area of the ventilation channel (84) decreases. A slit (6) is provided at the end of the ventilation channel (84). The narrow slit air outlet (81) is located at the end of the slit (6). The inner peripheral wall of the housing (82) is provided with a wind shield (83) protruding towards the inner peripheral side of the housing (82). The wind shield (83) is located at the trailing edge of the air inlet of the ventilation channel (84) and is bent towards the oncoming flow direction. The wind shield (83) can split 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 along the axial direction of the housing (82) from the leeward side of the wind shield (83).

2. The air guiding device according to claim 1, wherein The guiding wall surfaces of the ventilation channel (84) and the slit (6) are arc-shaped, and the guiding wall surface of the ventilation channel (84) is smoothly transitionally connected with the guiding wall surface of the slit (6).

3. The air guiding device according to claim 1, wherein The wind shield (83) is annular.

4. The air guiding device according to claim 3, characterized in that, The wind shield (83) includes an outer peripheral guiding surface and an inner peripheral guiding surface. The outer peripheral guiding surface is connected to the rear guiding wall surface of the ventilation channel (84), and the inner peripheral guiding surface is connected to the inner peripheral wall of the housing (82). Along the direction close to the inner peripheral wall of the housing (82), the interval between the outer peripheral guiding surface and the inner peripheral guiding surface increases.

5. The air guiding device according to claim 4, characterized in that, The outer peripheral guiding surface is concave arc-shaped, and the inner peripheral guiding surface is convex arc-shaped.

6. The air guiding device according to claim 4, characterized in that, The outer peripheral guiding surface is flush with the rear guiding wall surface of the ventilation channel (84) at the connection position, and the outer peripheral guiding surface and the rear guiding wall surface of the ventilation channel (84) are spliced to form a smooth arc-shaped guiding surface.

7. The air guiding device according to claim 1, characterized in that An air outlet cover (85) is provided on the outer peripheral side of the housing (82). The slit (6) is located on the air outlet cover (85).

8. The air guiding device according to claim 7, characterized in that, The air outlet covers (85) are arranged at intervals along the outer peripheral circumference of the housing (82), and the ventilation channels (84) are arranged at intervals along the inner peripheral circumference of the housing (82). One ventilation channel (84) is provided corresponding to one air outlet cover (85).

9. The air guiding device according to claim 7, characterized in that, The end of the air outlet cover (85) is bent towards the guiding direction to form a bent section, and the slit (6) is located on the bent section.

10. A motor air duct structure, characterized in that, It includes the air guiding device according to any one of claims 1 to 9.

11. The motor air duct structure according to claim 10, characterized in that, The motor air duct structure further includes a housing (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). The end cover (5) is fixedly connected to the housing (1). The air guiding device (15) is installed in the end cover (5). The fan (8) is fixed on the rotor (16) and is located in the air cavity (7) of the air guiding device (15). A first cooling channel (2) is provided on the housing (1). Airflow can enter the first cooling channel (2) through the air guiding device (15) under the action of the fan (8) and enter the front bearing assembly (17) through the first cooling channel (2).

12. The motor air duct structure according to claim 11, wherein, The motor air duct structure further includes a second cooling channel (10). Airflow can enter the second cooling channel (10) through the air guiding device (15) and cool the rear bearing assembly (18) and the rotor (16) from the second cooling channel (10).

13. The motor air duct structure according to claim 11, wherein, The end cover (5) forms a convex arc guiding surface (20) at the narrow slit air outlet (81). The convex arc guiding surface (20) can guide the air flowing out of the narrow slit air outlet (81) to the first cooling channel (2).

14. The motor air duct structure according to claim 13, characterized in that, The end cover (5) is provided with a guiding channel (21) communicating with the first cooling channel (2) at the position where it is connected to the housing (1). The convex arc guiding surface (20) guides the airflow into the first cooling channel (2) through the guiding channel (21).

15. The motor air duct structure according to claim 13, characterized in that, The front side edge of the narrow slit air outlet (81) is connected to the convex arc guiding surface (20), and the guiding direction of the front side edge of the narrow slit air outlet (81) is tangent to the convex arc guiding surface (20) at the connection position.

16. 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 housing (1). The exhaust hood (14) has an annular cavity (22). An exhaust main pipe (12) is provided on the exhaust hood (14). The exhaust main pipe (12) communicates with the annular cavity (22). An exhaust port (11) is provided on the housing (1). The first cooling channel (2) and the second cooling channel (10) communicate with the annular cavity (22) through the exhaust port (11).

17. The motor air duct structure according to claim 11, wherein, There are multiple first cooling channels (2), and the multiple first cooling channels (2) are arranged at intervals along the circumferential direction of the housing (1).

18. The motor air duct structure according to claim 12, characterized in that, A water channel (13) is provided inside the housing (1). The water channel (13) is arranged along the circumferential direction of the housing (1). At least part of the first cooling channel (2) is located on the outer peripheral side of the water channel (13).

19. The motor air duct structure according to claim 18, characterized in that, 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) is located on the axial outer side of the water channel (13). The second axial section (25) is located on the outer peripheral side of the water channel (13). The radial section (24) connects the first axial section (23) and the second axial section (25).

20. The motor air duct structure according to claim 19, characterized in that, A rib (27) extending axially is provided on the outer periphery of the housing (1). A radial post (4) is provided at the connection position of the first axial section (23) and the second axial section (25) of the rib (27). A radial hole communicating with the radial section (24) is provided on the radial post (4), and a sealing plug (26) is provided in the radial hole.

21. The motor air duct structure according to claim 20, characterized in that, An exhaust hood (14) is sleeved on the outer peripheral side of the housing (1). The exhaust hood (14) has an annular cavity (22). An exhaust main pipe (12) is provided on the exhaust hood (14), and the exhaust main pipe (12) communicates with the annular cavity (22). An exhaust port (11) is provided on the housing (1). The first cooling channel (2) and the second cooling channel (10) communicate with the annular cavity (22) through the exhaust port (11). An installation groove (28) is provided on the exhaust hood (14), and the rib (27) is located in the installation groove (28).

22. The motor air duct structure according to claim 21, characterized in that, Flanges (29) are provided on both axial sides of the exhaust hood (14), and the flanges (29) are attached to the outer wall of the housing (1).

23. The motor air duct structure according to claim 22, characterized in that, The flange (29) is fixedly connected to the housing (1) by screws.

24. The motor air duct structure according to claim 16 or 21, characterized in that, An air extraction pump is connected to the exhaust main pipe (12).

25. A magnetic levitation motor, characterized in that, It includes the air guiding device (15) according to any one of claims 1 to 9 or the motor air duct structure according to any one of claims 10 to 24.

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