Motor

Abstract

The embodiment of the invention provides a motor. The motor comprises a rotating shaft, a fan, a bearing and an end cover. The fan sleeves the rotating shaft. The bearing sleeves at least one end of the rotating shaft. The end cover is arranged at one axial end of the motor. The end cap forms a bearing chamber. The bearing is arranged in the bearing chamber. And the end cover and the fan enclose to form a cooling air duct. The cooling air duct is located on the peripheral side of the bearing chamber. The cooling air channel comprises an air inlet channel and an air outlet channel. The rotating shaft drives the fan to rotate, and air outside the motor enters from the air inlet channel and is exhausted from the air outlet channel. The air outlet direction of the air outlet channel is not parallel to the air inlet direction of the air inlet channel so that air in the air outlet channel can be exhausted in the direction away from the air inlet channel. According to the motor provided by the embodiment of the invention, the air outlet direction of the air outlet channel of the cooling air channel is not parallel to the air inlet direction of the air inlet channel, so that the condition that hot air discharged from the air outlet channel is sucked into the air inlet channel again is improved, and the heat dissipation efficiency of the bearing is improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a motor. Background Art

[0002] Currently, traction motors used in rail transit generally adopt permanent magnet synchronous motors with a fully enclosed structure, and heat dissipation is achieved by forced ventilation inside the motor and by using heat dissipation ribs on the motor base.

[0003] In the related art, the motor usually uses a fan installed on the shaft to rotate with the shaft, and uses the negative pressure generated by the fan to guide the cooling wind to the outside of the bearing, thereby strengthening the flow of air around the bearing to dissipate heat from the bearing. However, the heat generated in the bearing part during operation is usually large, and the heat dissipation performance of the motor with a fully enclosed structure is poor, which often easily causes the bearing to overheat, thereby affecting the performance and life of the motor. Summary of the invention

[0004] In view of this, an embodiment of the present application hopes to provide a motor to improve the heat dissipation performance of the motor at the bearing.

[0005] To achieve the above object, an embodiment of the present application provides a motor, comprising:

[0006] A rotating shaft and a fan, wherein the fan is sleeved on the rotating shaft;

[0007] A bearing, wherein the bearing is sleeved on at least one end of the rotating shaft;

[0008] An end cover, the end cover is arranged at one axial end of the motor, the end cover is formed with a bearing chamber, the bearing is arranged in the bearing chamber, the end cover and the fan are surrounded to form a cooling air duct, the cooling air duct is located on the outer peripheral side of the bearing chamber, and the cooling air duct includes an air inlet channel and an air outlet channel;

[0009] The rotating shaft drives the fan to rotate, and the air outside the motor enters from the air inlet channel and is discharged from the air outlet channel. The air outlet direction of the air outlet channel is not parallel to the air inlet direction of the air inlet channel, so that the wind in the air outlet channel is discharged in a direction away from the air inlet channel.

[0010] In some embodiments, an angle between an air outlet direction of the air outlet channel and an air inlet direction of the air inlet channel is an acute angle.

[0011] In some embodiments, the angle ranges from 30° to 50°.

[0012] In some embodiments, the extension direction of the air inlet channel is parallel to the axial direction of the motor, and the air outlet channel is arranged on the outer side of the air inlet channel along the radial direction of the motor.

[0013] In some embodiments, the motor includes an inner seal, which is sleeved on the rotating shaft and located on the side of the bearing close to the rotor core of the motor, and the fan is located on the side of the end cover close to the rotor core of the motor. The inner seal, the rotating shaft and the fan define a dust collection chamber, and at least one cooling air duct is connected to the dust collection chamber, and the dust collection chamber is at least used to collect foreign matter entering the cooling air duct.

[0014] In some embodiments, at least one of the air outlet channels is disposed below the bearing chamber, and at least the air outlet channel disposed below the bearing chamber is communicated with the dust removal chamber.

[0015] In some embodiments, the end cover and the fan define a transition channel, and the cooling air duct is connected to the dust collection chamber through the transition channel. In the direction from the cooling air duct to the dust collection chamber, the distance between at least a portion of the cavity wall of the transition channel close to the bearing chamber side and the rotating shaft gradually decreases.

[0016] In some embodiments, an angle between at least a portion of a cavity wall of the transition channel close to the bearing chamber and an extension direction of the air inlet channel ranges from 135° to 150°.

[0017] In some embodiments, a first labyrinth sealing ring is formed on the outer periphery of the fan, and a second labyrinth sealing ring is formed on the end cover, and the first labyrinth sealing ring and the second labyrinth sealing ring are both provided with at least two sealing teeth, the sealing teeth of the first labyrinth sealing ring extend in a direction away from the rotor core of the motor, and the sealing teeth of the second labyrinth sealing ring extend in a direction toward the rotor core of the motor, and a labyrinth seal is formed between the first labyrinth sealing ring and the second labyrinth sealing ring by mutual nesting of the sealing teeth;

[0018] Along the radial direction of the motor, the first labyrinth sealing ring covers the labyrinth teeth on a side of the second labyrinth sealing ring closest to the central axis of the motor.

[0019] In some embodiments, the end cover has a third labyrinth sealing ring, the inner seal has a fourth labyrinth sealing ring, the third labyrinth sealing ring and the fourth labyrinth sealing ring are both provided with at least two sealing teeth, the sealing teeth of the third labyrinth sealing ring extend in a direction away from the bearing chamber, the sealing teeth of the fourth labyrinth sealing ring extend in a direction toward the bearing chamber, and a labyrinth seal is formed between the third labyrinth sealing ring and the fourth labyrinth sealing ring by mutual nesting of the sealing teeth;

[0020] Along the radial direction of the motor, the third labyrinth sealing ring covers the labyrinth teeth on the side of the fourth labyrinth sealing ring farthest from the central axis of the motor.

[0021] In some embodiments, a single air outlet channel corresponds to at least one air inlet channel.

[0022] In some embodiments, the end cover forms the air outlet channel, and the air outlet channel located at the bottom of the end cover corresponds to at least two of the air inlet channels.

[0023] The motor provided in the embodiment of the present application, on the one hand, increases the heat exchange area of ​​the outer periphery of the bearing chamber by setting the cooling air duct on the outer peripheral side of the bearing chamber, so that the air entering the cooling air duct can take away more bearing heat emitted from the bearing chamber, thereby improving the cooling effect on the bearing. On the other hand, by setting the air outlet direction of the air outlet channel of the cooling air duct to be non-parallel to the air inlet direction of the air inlet channel, the hot air discharged from the air outlet of the air outlet channel can be discharged in a direction away from the air inlet of the air inlet channel, thereby improving the situation where the hot air discharged from the air outlet channel is re-inhaled by the air inlet of the air inlet channel, causing the temperature of the air entering from the air inlet channel to increase, and the cooling and heat exchange effect of the cooling air duct on the bearing is weakened, thereby improving the heat dissipation efficiency of the bearing, thereby improving the stability and reliability of the motor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A partial axial schematic diagram of the motor provided in this application;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure after removing the filter;

[0026] Figure 3 A cross-sectional view of the motor provided for this application;

[0027] Figure 4 for Figure 3 Enlarged view of the upper part;

[0028] Figure 5 for Figure 5 Enlarged view of the lower half.

[0029] Description of Reference Numerals

[0030] 10. Motor; 10a. Cooling air duct; 10b. Air inlet channel; 10c. Air outlet channel; 10d. Air inlet; 10e. Air outlet; 10f. Dust collection chamber; 10g. Transition channel; 10h. Inner chamber; 11. Rotating shaft; 12. Fan; 12a. First labyrinth seal ring; 13. Bearing; 14. End cover; 14a. Bearing chamber; 14b. Second labyrinth seal ring; 14c. Third labyrinth seal ring; 141. Filter; 15. Inner seal; 15a. Fourth labyrinth seal ring; 16. Outer seal; 17. Bearing chamber end cover; 18. Casing; 19. Rotor core. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0032] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "vertical", "inner", "outer", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0035] Currently, traction motors used in rail transit generally adopt permanent magnet synchronous motors with a fully enclosed structure, and heat dissipation is achieved by forced ventilation inside the motor and by using heat dissipation ribs on the motor base.

[0036] In the related art, the motor usually uses a fan installed on the shaft to rotate with the shaft, and uses the negative pressure generated by the fan to guide the cooling wind to the outside of the bearing, thereby strengthening the flow of air around the bearing to dissipate heat from the bearing. However, the heat generated in the bearing part during operation is usually large, and the heat dissipation performance of the motor with a fully enclosed structure is poor, which often easily causes the bearing to overheat, thereby affecting the performance and life of the motor.

[0037] Based on the above situation, the present application embodiment provides a motor 10, please refer to Figures 1 to 5 The motor 10 includes a rotating shaft 11, a fan 12, a bearing 13 and an end cover 14. The fan 12 is sleeved on the rotating shaft 11. The bearing 13 is sleeved on at least one end of the rotating shaft 11. The end cover 14 is arranged at one axial end of the motor 10. The end cover 14 is formed with a bearing chamber 14a. The bearing 13 is arranged in the bearing chamber 14a. The end cover 14 and the fan 12 are surrounded to form a cooling air duct 10a. The cooling air duct 10a is located on the outer peripheral side of the bearing chamber 14a. The cooling air duct 10a includes an air inlet channel 10b and an air outlet channel 10c. The rotating shaft 11 drives the fan 12 to rotate, and the air outside the motor 10 enters from the air inlet channel 10b and is discharged from the air outlet channel 10c. The air outlet direction of the air outlet channel 10c is not parallel to the air inlet direction of the air inlet channel 10b, so that the wind in the air outlet channel 10c is discharged in a direction away from the air inlet channel 10b.

[0038] It should be noted that the motor 10 in the present application can be any type of motor 10 and is not limited here. For example, the motor 10 in the present application is a permanent magnet synchronous motor 10 or a three-phase asynchronous motor 10.

[0039] In the present application, "axial", "circumferential", and "radial" refer to the axial, circumferential, and radial directions of the motor 10, respectively. In the embodiment of the present application, the axial, circumferential, and radial directions of the rotating shaft 11, the rotor core 19, and the motor 10 are all consistent.

[0040] The fan 12 is sleeved on the rotating shaft 11 and fixedly connected to the rotating shaft 11 so that the rotating shaft 11 can drive the fan 12 to rotate synchronously.

[0041] Exemplarily, the fan 12 and the rotating shaft 11 are in interference connection.

[0042] The bearing 13 is sleeved on the rotating shaft 11, which means that the inner ring of the bearing 13 is fixedly connected to the rotating shaft 11. For example, the inner ring of the bearing 13 is connected to the rotating shaft 11 through an interference fit.

[0043] The bearing 13 is sleeved on at least one end of the rotating shaft 11, which means that the rotating shaft 11 is sleeved on one end of the rotating shaft 11 in the axial direction or is sleeved on both ends of the rotating shaft 11 in the axial direction. The bearing 13 here refers to the target bearing 13 cooled by the cooling air duct 10a, and does not include the bearing 13 provided on the rotating shaft 11 without the cooling air duct 10a. This means that the cooling air duct 10a can be formed on the end cover 14 at one end of the motor 10, or can be formed on the end covers 14 at both ends of the motor 10 in the axial direction.

[0044] Exemplarily, according to the actual operating condition of the motor 10 , the cooling air duct 10 a is formed only on the end cover 14 at the load end of the motor 10 .

[0045] The embodiment of the present application is described by taking the cooling air duct 10 a formed on the end cover 14 at one end of the motor 10 as an example.

[0046] The end cover 14 is formed with a bearing chamber 14 a , and the bearing 13 is disposed in the bearing chamber 14 a , which means that the outer ring of the bearing 13 and the inner wall of the bearing chamber 14 a are interferingly fitted to fix the end cover 14 and the outer ring of the bearing 13 .

[0047] The end cover 14 and the fan 12 are arranged to form a cooling air duct 10 a. It should be noted that the end cover 14 is connected to the housing 18 of the motor 10 and is fixed relative to the housing 18 of the motor 10 . Therefore, when the motor 10 is running, the fan 12 will rotate relative to the end cover 14 .

[0048] The cooling air duct 10a is located on the outer peripheral side of the bearing chamber 14a, wherein one or more cooling air ducts 10a can be arranged around the bearing chamber 14a, for example, the number of cooling air ducts 10a located on the outer peripheral side of the bearing chamber 14a is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, etc.

[0049] The multiple mentioned in the embodiments of the present application refers to a number of two or more.

[0050] The plurality of cooling air ducts 10a may be arranged at the same circumferential intervals or at different circumferential intervals.

[0051] Specifically, the cooling air duct 10a extends axially from the side of the outer periphery of the bearing chamber 14a away from the rotor core 19 of the motor 10 to the side of the rotor core 19 close to the motor 10, thereby increasing the heat transfer area of ​​the cooling air duct 10a at the outer periphery of the bearing chamber 14a, so that the cooling air can take away more heat of the bearing 13 radiated from the bearing chamber 14a, thereby improving the heat exchange efficiency of the cooling air to the bearing 13.

[0052] The rotating shaft 11 drives the fan 12 to rotate, thereby generating negative pressure in the cooling air duct 10a.

[0053] The air outside the motor 10 enters from the air inlet channel 10b and is discharged from the air outlet channel 10c, thereby taking away the heat in the cooling air channel 10a. The heat in the cooling air channel 10a includes the heat generated by the bearing 13 that is dissipated from the bearing chamber 14a through the end cover 14 to the cooling air channel 10a.

[0054] It should be noted that the end of the air inlet channel 10b is connected to the beginning of the air outlet channel 10c.

[0055] The air outlet direction of the air outlet channel 10c is not parallel to the air inlet direction of the air inlet channel 10b, which means that the angle between the air outlet direction of the air outlet channel 10c and the air inlet direction of the air inlet channel 10b can be an acute angle, a right angle or an obtuse angle.

[0056] It can be understood that the air outlet direction of the air outlet channel 10c can be defined by the extension direction of the air outlet channel 10c at least close to the air outlet 10e, and similarly, the air inlet direction of the air inlet channel 10b can be defined by the extension direction of the air inlet channel 10b at least close to the air inlet 10d.

[0057] In this way, by limiting the extension direction of at least a portion of the outlet channel 10c close to the outlet 10e and the extension direction of at least a portion of the inlet channel 10b close to the inlet 10d to have a certain angle, the hot air discharged from the outlet 10e of the outlet channel 10c can be discharged in a direction away from the inlet 10d of the inlet channel 10b, thereby improving the situation in which the hot air discharged from the outlet channel 10c is re-sucked into the inlet 10d of the inlet channel 10b, causing the temperature of the air entering from the inlet channel 10b to increase, and the cooling and heat exchange effect of the cooling air duct 10a on the bearing 13 is weakened, thereby improving the heat dissipation efficiency of the bearing 13.

[0058] Exemplarily, the end cover 14 is further provided with a filter 141 outside the air inlet passage 10b to filter larger foreign matter.

[0059] The motor 10 provided in the embodiment of the present application, on the one hand, increases the heat exchange area of ​​the outer periphery of the bearing chamber 14a by setting the cooling air duct 10a on the outer peripheral side of the bearing chamber 14a, so that the air entering the cooling air duct 10a can take away more heat of the bearing 13 emitted from the bearing chamber 14a, thereby improving the cooling effect on the bearing 13. On the other hand, by setting the outlet direction of the air outlet channel 10c of the cooling air duct 10a to be non-parallel to the inlet direction of the air inlet channel 10b, the hot air discharged from the air outlet 10e of the air outlet channel 10c can be discharged in a direction away from the air inlet 10d of the air inlet channel 10b, thereby improving the situation that the hot air discharged from the air outlet channel 10c is sucked back into the air inlet 10d of the air inlet channel 10b, causing the temperature of the air entering from the air inlet channel 10b to rise, and the cooling and heat exchange effect of the cooling air duct 10a on the bearing 13 is weakened, thereby improving the heat dissipation efficiency of the bearing 13, thereby improving the stability and reliability of the operation of the motor 10.

[0060] For some examples, see Figures 1 to 5 The angle between the air outlet direction of the air outlet channel 10c and the air inlet direction of the air inlet channel 10b is an acute angle.

[0061] like Figure 3 and Figure 4 As shown, the angle between the air outlet direction of the air outlet channel 10c and the air inlet direction of the air inlet channel 10b is α.

[0062] The angle between the air outlet direction of the air outlet channel 10c and the air inlet direction of the air inlet channel 10b is an acute angle, which reduces the space occupied by the air outlet channel 10c and the air inlet channel 10b structures on the end cover 14, shortens the path length of the air outlet channel 10c and the air inlet channel 10b, and makes the end cover 14 smaller in size at least in the axial direction, thereby improving the compactness of the end cover 14 structure, thereby improving the overall compactness of the motor 10.

[0063] In some embodiments, the angle ranges from 30° to 50°.

[0064] Exemplarily, the angle α between the air outlet direction of the air outlet channel 10c and the air inlet direction of the air inlet channel 10b is 30°, 32°, 35°, 38°, 40°, 42°, 45°, 48° or 50°, etc.

[0065] By setting the angle α between the outlet direction of the air outlet channel 10c and the inlet direction of the air inlet channel 10b to 30° to 50°, the occupied space and path length of the air outlet channel 10c and the air inlet channel 10b on the end cover 14 are within a reasonable range, and it is beneficial for hot air to be discharged from the air outlet channel 10c.

[0066] For some examples, see Figures 3 to 5The extending direction of the air inlet channel 10b is parallel to the axial direction of the motor 10. The air outlet channel 10c is arranged outside the air inlet channel 10b along the radial direction of the motor 10.

[0067] The extension direction of the air inlet channel 10 b is parallel to the axial direction of the motor 10 , that is, the extension direction of the air outlet channel 10 c has a certain angle with the axial direction of the motor 10 .

[0068] The air outlet channel 10c is arranged on the outer side of the air inlet channel 10b along the radial direction of the motor 10, which means that for the same cooling air duct 10a, the air outlet channel 10c is arranged on the side of the air inlet channel 10b connected thereto away from the central axis of the motor 10, such as Figure 1 and Figure 2 As shown, when observed from the outer end surface of the end cover 14, the diameter of the circle where the air outlet 10e of each air outlet channel 10c is located is greater than the diameter of the circle where the air inlet 10d of each air inlet channel 10b is located.

[0069] Here, by setting the extension direction of the air inlet channel 10b to be parallel to the axial direction of the motor 10, and at the same time, the air outlet channel 10c is set on the radial outer side of the air inlet channel 10b along the motor 10, that is, from the connection end of the air outlet channel 10c connected to the air inlet channel 10b to the air outlet 10e of the air outlet channel 10c, the distance between the air outlet channel 10c and the central axis of the motor 10 gradually increases, and the air outlet 10e of the air outlet channel 10c of each cooling air channel 10a is on the periphery of the air inlet 10d of the air inlet channel 10b, so that the exhaust directions of the air outlet channels 10c of each cooling air channel 10a are staggered with each other, which is conducive to the discharge of hot air in the radial direction away from the end cover 14, improves the situation where the hot air discharged from the cooling air channel 10a reaches the air inlet 10d of other cooling air channels 10a, and improves the cooling efficiency of the bearing 13.

[0070] For some examples, see Figures 3 to 5 The motor 10 includes an inner seal 15. The inner seal 15 is sleeved on the shaft 11 and is located on the side of the bearing 13 close to the rotor core 19 of the motor 10. The fan 12 is located on the side of the end cover 14 close to the rotor core 19 of the motor 10. The inner seal 15, the shaft 11 and the fan 12 define a dust removal chamber 10f. At least one cooling air duct 10a is connected to the dust removal chamber 10f. The dust removal chamber 10f is at least used to collect foreign matter entering the cooling air duct 10a.

[0071] It should be noted that the inner seal 15 and the end cover 14 define a bearing chamber 14a together. The inner seal 15 and the rotating shaft 11 are interference fit and can rotate together with the rotating shaft 11, that is, the inner seal 15 and the end cover 14 can rotate relative to each other.

[0072] The inner seal 15 is located on the side of the bearing 13 close to the rotor core 19 of the motor 10, and the fan 12 is located on the side of the end cover 14 close to the rotor core 19 of the motor 10. In this way, along the axial direction of the motor 10, the fan 12, the inner seal 15 and the end cover 14 are arranged in sequence.

[0073] The inner sealing member 15, the rotating shaft 11 and the fan 12 define a dust falling chamber 10f. It can be understood that the dust falling chamber 10f is an annular structure.

[0074] At least one cooling air duct 10a is connected to the dust falling chamber 10f, which means that one cooling air duct 10a on the same end cover 14 is connected to the dust falling chamber 10f or multiple cooling air ducts 10a are connected to the dust falling chamber 10f.

[0075] For some examples, see Figures 1 to 5 The motor 10 further includes an outer seal 16 and a bearing chamber end cover 17. The inner ring of the outer seal 16 is interference fit with the rotating shaft 11, the bearing chamber end cover 17 is fixedly connected to the end cover 14, and the bearing chamber end cover 17, the end cover 14, the inner seal 15, and the outer seal 16 define a bearing chamber 14a. A labyrinth seal is formed between the outer periphery of the outer seal 16 and the inner hole of the bearing chamber end cover 17. In this way, the outer seal 16 can rotate relative to the bearing chamber end cover 17, and a reliable seal can be formed between the outer seal 16 and the bearing chamber end cover 17, which can improve the sealing performance of the bearing chamber 14a, thereby increasing the life of the bearing 13 and improving the reliability of the operation of the motor 10.

[0076] For some examples, see Figure 1 to Figure 2 At least one air outlet channel 10c is disposed below the bearing chamber 14a. At least the air outlet channel 10c disposed below the bearing chamber 14a is communicated with the dust falling chamber 10f.

[0077] It should be noted that the bottom of the bearing chamber 14 a refers to the bottom along the gravity direction relative to the motor 10 , that is, in the vertical direction.

[0078] It can be understood that at least one air outlet channel 10c is arranged below the bearing chamber 14a, which is conducive to the foreign matter in the dust collection chamber 10f being discharged from the cooling air duct 10a through the air outlet channel 10c connected to the dust collection chamber 10f and arranged below the bearing chamber 14a through the action of gravity and centrifugal force.

[0079] For some examples, see Figures 3 to 5 The end cover 14 and the fan 12 define a transition channel 10g. The cooling air duct 10a is connected to the dust-falling chamber 10f through the transition channel 10g. From the cooling air duct 10a to the dust-falling chamber 10f, the distance between at least part of the cavity wall of the transition channel 10g close to the bearing chamber 14a and the rotating shaft 11 gradually decreases.

[0080] From the cooling air duct 10a to the dust collecting chamber 10f, the distance between at least part of the cavity wall of the transition channel 10g close to the bearing chamber 14a and the rotating shaft 11 gradually decreases. In this way, at least part of the cavity wall of the transition channel 10g close to the bearing chamber 14a forms a slope, which is beneficial to guide foreign matter entering from the air inlet channel 10b into the dust collecting chamber 10f.

[0081] In some embodiments, the angle between at least a portion of the cavity wall of the transition channel 10g on the side close to the bearing chamber 14a and the extension direction of the air inlet channel 10b ranges from 135° to 150°.

[0082] like Figure 4 As shown, the angle between at least a portion of the cavity wall of the transition channel 10g close to the bearing chamber 14a and the extension direction of the air inlet channel 10b is represented by β.

[0083] Exemplarily, the angle between at least part of the cavity wall of the transition channel 10g close to the bearing chamber 14a and the extension direction of the air inlet channel 10b is 135°, 138°, 140°, 142°, 145°, 148° or 150°, etc.

[0084] Here, by setting the angle range between at least part of the cavity wall of the transition channel 10g close to the bearing chamber 14a and the extension direction of the air inlet channel 10b to 135°~150°, the structure of the end cover 14 is made more reasonable, which is convenient for assembly and also helps to guide foreign objects by at least part of the cavity wall of the transition channel 10g close to the bearing chamber 14a.

[0085] For some examples, see Figures 3 to 5 A first labyrinth sealing ring 12a is formed on the periphery of the fan 12. A second labyrinth sealing ring 14b is formed on the end cover 14. Both the first labyrinth sealing ring 12a and the second labyrinth sealing ring 14b are provided with at least two sealing teeth. The sealing teeth of the first labyrinth sealing ring 12a extend in a direction away from the rotor core 19 of the motor 10. The sealing teeth of the second labyrinth sealing ring 14b extend in a direction toward the rotor core 19 of the motor 10. A labyrinth seal is formed between the first labyrinth sealing ring 12a and the second labyrinth sealing ring 14b by the mutual nesting of the sealing teeth. Along the radial direction of the motor 10, the first labyrinth sealing ring 12a covers the labyrinth teeth of the second labyrinth sealing ring 14b on the side closest to the central axis of the motor 10.

[0086] It should be noted that the outer shell 18 and the end cover 14 of the motor 10 jointly define an inner cavity 10h, and the rotor core 19 and the stator core of the motor 10 are both arranged in the inner cavity 10h. In addition to rotating with the rotating shaft 11 to generate negative pressure, the fan 12 also serves to seal and isolate the inner cavity 10h of the motor 10 where the stator and rotor cores 19 of the motor 10 are located.

[0087] Exemplarily, the fan 12 includes a fan disk and fan blades formed on one side of the fan disk along the axial direction. The fan disk is a non-hollow, fully enclosed structure, which is used to enclose the inner cavity 10h of the motor 10 and isolate the heat generated by the stator and rotor during the operation of the motor 10. The fan blades are located in the cooling air duct 10a, and when the fan 12 rotates, the fan blades generate negative pressure in the cooling air duct 10a.

[0088] A labyrinth seal is formed between the first labyrinth seal ring 12a and the second labyrinth seal ring 14b by the mutual nesting of sealing teeth. In this way, the fan 12 can rotate relative to the end cover 14, and a reliable seal can be formed between the fan 12 and the end cover 14, thereby improving the sealing performance of the inner cavity 10h of the motor 10 and improving the situation in which dust or foreign matter in the cooling air duct 10a enters the inner cavity 10h of the motor 10 from between the fan 12 and the end cover 14. At the same time, the fan 12 and the end cover 14 can form a physical isolation to isolate the heat of the winding end in the inner cavity 10h, which is beneficial to the heat dissipation of the bearing 13 by the cooling air duct 10a.

[0089] Exemplarily, sealing grease is also provided between the sealing teeth of the first labyrinth sealing ring 12a and the sealing teeth of the second labyrinth sealing ring 14b, thereby improving the sealing performance between the first labyrinth sealing ring 12a and the second labyrinth sealing ring 14b, improving the situation where foreign matter enters the inner cavity 10h of the motor 10, and improving the reliability of the operation of the motor 10.

[0090] It should be noted that the sealing teeth of the first labyrinth seal ring 12a and the second labyrinth seal ring 14b are both annular.

[0091] The number of sealing teeth of the first labyrinth sealing ring 12a and the second labyrinth sealing ring 14b may be 2, 3, 4, 5, 6 or 7, etc., which is not limited here.

[0092] The sealing teeth of the first labyrinth sealing ring 12a formed on the outer periphery of the fan 12 extend in the direction away from the rotor core 19 of the motor 10, and the sealing teeth of the second labyrinth sealing ring 14b extend in the direction of the rotor core 19 of the motor 10. In this way, the sealing teeth of the first labyrinth sealing ring 12a and the sealing teeth of the second labyrinth sealing ring 14b are axially arranged opposite to each other to form a mutual nesting, so that the labyrinth sealing structure formed by the mutual nesting of the sealing teeth between the first labyrinth sealing ring 12a and the second labyrinth sealing ring 14b is simpler and more conducive to production and assembly.

[0093] Along the radial direction of the motor 10, the first labyrinth sealing ring 12a covers the labyrinth teeth of the second labyrinth sealing ring 14b which are closest to the central axis of the motor 10, which means that the labyrinth teeth of the first labyrinth sealing ring 12a which are closest to the central axis of the motor 10 cover the inner circumference of the labyrinth teeth of the second labyrinth sealing ring 14b which are closest to the central axis of the motor 10, and the labyrinth teeth of the first labyrinth sealing ring 12a which are closest to the central axis of the motor 10 are closer to the central axis of the motor 10. When dust or foreign matter in the cooling air duct 10a is discharged from the air outlet channel 10c, this structure can improve the situation where dust or foreign matter accumulates at the nesting point of the first labyrinth sealing ring 12a and the second labyrinth sealing ring 14b, thereby easily entering the inner cavity 10h of the motor 10.

[0094] For some examples, see Figures 3 to 5 , the end cover 14 has a third labyrinth sealing ring 14c. The inner seal 15 has a fourth labyrinth sealing ring 15a. The third labyrinth sealing ring 14c and the fourth labyrinth sealing ring 15a are both provided with at least two sealing teeth. The sealing teeth of the third labyrinth sealing ring 14c extend in a direction away from the bearing chamber 14a. The sealing teeth of the fourth labyrinth sealing ring 15a extend in a direction toward the bearing chamber 14a. A labyrinth seal is formed between the third labyrinth sealing ring 14c and the fourth labyrinth sealing ring 15a by the mutual nesting of the sealing teeth. Along the radial direction of the motor 10, the third labyrinth sealing ring 14c covers the labyrinth teeth of the fourth labyrinth sealing ring 15a on the side farthest from the central axis of the motor 10.

[0095] It should be noted that the inner seal 15 is used to isolate the bearing chamber 14a from the cooling air duct 10a.

[0096] A labyrinth seal is formed by the mutual nesting of sealing teeth between the third labyrinth seal ring 14c and the fourth labyrinth seal ring 15a. The inner seal 15 can rotate relative to the end cover 14, and a reliable seal can be formed between the inner seal 15 and the end cover 14, thereby improving the sealing performance of the bearing chamber 14a and improving the situation in which dust or foreign matter in the cooling air duct 10a enters the bearing chamber 14a from between the inner seal 15 and the end cover 14.

[0097] Exemplarily, sealing grease is provided between the sealing teeth of the third labyrinth sealing ring 14c and the sealing teeth of the fourth labyrinth sealing ring 15a, thereby improving the sealing performance between the third labyrinth sealing ring 14c and the fourth labyrinth sealing ring 15a, thereby improving the operating reliability of the motor 10.

[0098] The sealing teeth of the third labyrinth sealing ring 14c of the end cover 14 extend in a direction away from the bearing chamber 14a, and the sealing teeth of the fourth labyrinth sealing ring 15a of the inner seal 15 extend in the direction of the bearing chamber 14a. In this way, the sealing teeth of the third labyrinth sealing ring 14c and the sealing teeth of the fourth labyrinth sealing ring 15a are axially arranged opposite to each other to form mutual nesting, so that the labyrinth sealing structure formed by the mutual nesting of the sealing teeth between the third labyrinth sealing ring 14c and the fourth labyrinth sealing ring 15a is simpler and more conducive to production and assembly.

[0099] In this way, the labyrinth teeth of the third labyrinth sealing ring 14c of the end cover 14 on the side farthest from the central axis of the motor 10 cover the outer periphery of the labyrinth teeth of the fourth labyrinth sealing ring 15a on the side farthest from the central axis of the motor 10. When dust or foreign matter in the cooling air duct 10a enters from the air inlet channel 10b, this structure can improve the situation where dust or foreign matter accumulates at the nesting point of the third labyrinth sealing ring 14c and the fourth labyrinth sealing ring 15a, thereby easily entering the bearing chamber 14a.

[0100] In some embodiments, a single air outlet channel 10c corresponds to at least one air inlet channel 10b.

[0101] A single air outlet channel 10c corresponds to at least one air inlet channel 10b, which means that one air outlet channel 10c can be connected to one air inlet channel 10b or multiple air inlet channels 10b. In other words, multiple air outlet channels 10c can be connected to multiple air inlet channels 10b in one cooling air channel 10a.

[0102] The multiple mentioned in the embodiments of the present application refers to a number of two or more.

[0103] For some examples, see Figure 1 to Figure 2 The end cover 14 forms an air outlet channel 10c. The air outlet channel 10c located at the bottom of the end cover 14 corresponds to at least two air inlet channels 10b.

[0104] It should be noted that the air outlet channel 10c located at the bottom of the end cover 14 can be used to discharge foreign matter or dust in the cooling air channel 10a.

[0105] The air outlet channel 10c located at the bottom of the end cover 14 corresponds to at least two air inlet channels 10b, that is, the air outlet channel 10c located at the bottom of the end cover 14 is connected to at least two air inlet channels 10b.

[0106] Exemplarily, the cooling air duct 10a on the end cover 14 includes an air inlet channel 10b and an air outlet channel 10c. The air outlet channels 10c of two adjacent cooling air ducts 10a located at the bottom of the end cover 14 can be connected, and the air outlets 10e of the two air outlet channels 10c are also connected to form a structure where two air inlet channels 10b are connected to a large air outlet channel 10c. The enlarged air outlet channel 10c is conducive to the discharge of foreign matter or dust.

[0107] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0108] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A motor, characterized in that: include: A rotating shaft and a fan, wherein the fan is sleeved on the rotating shaft; A bearing, wherein the bearing is sleeved on at least one end of the rotating shaft; An end cover, the end cover is arranged at one axial end of the motor, the end cover is formed with a bearing chamber, the bearing is arranged in the bearing chamber, the end cover and the fan are surrounded to form a cooling air duct, the cooling air duct is located on the outer peripheral side of the bearing chamber, and the cooling air duct includes an air inlet channel and an air outlet channel; The rotating shaft drives the fan to rotate, and the air outside the motor enters from the air inlet channel and is discharged from the air outlet channel. The air outlet direction of the air outlet channel is not parallel to the air inlet direction of the air inlet channel, so that the wind in the air outlet channel is discharged in a direction away from the air inlet channel.

2. The motor according to claim 1, characterized in that An angle between an air outlet direction of the air outlet channel and an air inlet direction of the air inlet channel is an acute angle.

3. The motor according to claim 2, characterized in that The angle ranges from 30° to 50°.

4. The motor according to claim 1, characterized in that The extension direction of the air inlet channel is parallel to the axial direction of the motor, and the air outlet channel is arranged on the outer side of the air inlet channel along the radial direction of the motor.

5. The motor according to claim 4, characterized in that The motor includes an inner seal, which is sleeved on the rotating shaft and located on a side of the bearing close to the rotor core of the motor. The fan is located on a side of the end cover close to the rotor core of the motor. The inner seal, the rotating shaft and the fan define a dust collection chamber. At least one cooling air duct is connected to the dust collection chamber. The dust collection chamber is at least used to collect foreign matter entering the cooling air duct.

6. The motor according to claim 5, characterized in that At least one of the air outlet channels is disposed below the bearing chamber, and at least the air outlet channel disposed below the bearing chamber is communicated with the dust removal chamber.

7. The motor according to claim 5, characterized in that The end cover and the fan define a transition channel, and the cooling air duct is connected to the dust collection chamber through the transition channel. In the direction from the cooling air duct to the dust collection chamber, the distance between at least part of the cavity wall of the transition channel close to the bearing chamber side and the rotating shaft gradually decreases.

8. The motor according to claim 7, characterized in that The angle between at least a portion of the cavity wall of the transition channel close to the bearing chamber and the extension direction of the air inlet channel ranges from 135° to 150°.

9. The motor according to claim 1, characterized in that A first labyrinth seal ring is formed on the outer periphery of the fan, and a second labyrinth seal ring is formed on the end cover. The first labyrinth seal ring and the second labyrinth seal ring are both provided with at least two sealing teeth. The sealing teeth of the first labyrinth seal ring extend in a direction away from the rotor core of the motor, and the sealing teeth of the second labyrinth seal ring extend in a direction toward the rotor core of the motor. A labyrinth seal is formed between the first labyrinth seal ring and the second labyrinth seal ring by mutual nesting of the sealing teeth. Along the radial direction of the motor, the first labyrinth sealing ring covers the labyrinth teeth on a side of the second labyrinth sealing ring closest to the central axis of the motor.

10. The motor according to claim 5, characterized in that The end cover has a third labyrinth sealing ring, the inner seal has a fourth labyrinth sealing ring, the third labyrinth sealing ring and the fourth labyrinth sealing ring are both provided with at least two sealing teeth, the sealing teeth of the third labyrinth sealing ring extend in a direction away from the bearing chamber, and the sealing teeth of the fourth labyrinth sealing ring extend in a direction toward the bearing chamber, and a labyrinth seal is formed between the third labyrinth sealing ring and the fourth labyrinth sealing ring by mutual nesting of the sealing teeth; Along the radial direction of the motor, the third labyrinth sealing ring covers the labyrinth teeth on the side of the fourth labyrinth sealing ring farthest from the central axis of the motor.

11. The motor according to claim 1, characterized in that A single air outlet channel corresponds to at least one air inlet channel; and / or, The end cover forms the air outlet channel, and the air outlet channel located at the bottom of the end cover corresponds to at least two of the air inlet channels.

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