Electric motor and high speed fan

Abstract

The application discloses a motor and a high-speed fan. The motor comprises a casing, an air outlet cover, a rotating shaft and a stator. The air guide fin is provided with a lead slot which penetrates along the radial direction of the air outlet cover. The lead-out wire of the stator is arranged in the lead slot. The thickness of the end of the guide vane which is away from the air outlet cover is smaller than the thickness of the end of the guide vane which is close to the air outlet cover. The end of the guide vane which faces the air outlet cover is overlapped with the projection of the air guide fin in the axial direction of the casing. The high-speed fan comprises the motor. In the application, the thickness of the air outlet side of the guide vane is increased, the bending degree of the guide vane when extending from the air inlet side to the air outlet side is reduced, the airflow can smoothly flow along the guide vane, the air pressure area of the air inlet side of the guide vane is reduced, the air guide fin or the guide vane is provided with the lead slot, the lead-out wire connected with the stator is arranged in the lead slot, the lead-out wire in the motor is led out from the side of the motor, the air outlet cover and the rotating shaft are conveniently installed in cooperation, the influence of the lead-out wire on the airflow of the air outlet side of the motor is small, and the air pressure and the air speed of the air outlet side can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan, in particular to a motor and high-speed fan. BACKGROUND

[0002] When the motor is used with the axial impeller, the air flow needs to be guided by the guide vanes in the motor shell to ensure the axiality and wind pressure after the air flow is blown out. The lead-out wire of the motor winding is usually led out from the end surface of the air outlet, which leads to the complex structure of the motor air outlet cover, is not conducive to the assembly of the motor rotating shaft and the air outlet cover, and easily causes the turbulence of the end part of the air outlet cover. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a motor which can reduce the influence of the lead-out wire on the air flow at the air outlet of the motor and facilitate the assembly of the motor rotating shaft and the air outlet cover.

[0004] The present application also provides a high-speed fan with the above motor.

[0005] The motor according to the first aspect of the present application comprises:

[0006] The motor shell comprises an inner shell, an outer shell and a plurality of guide vanes. The outer shell is annularly arranged outside the inner shell. The opposite sides of the guide vanes are connected to the inner shell and the outer shell respectively and are arranged in a spaced manner along the circumference of the inner shell. The adjacent guide vanes define a first air duct.

[0007] The air outlet cover is connected to one end of the motor shell. The air outlet cover comprises an inner cover, an outer cover and a plurality of air guide fins. The outer cover is annularly arranged outside the inner cover. The air guide fins extend along the axial direction of the outer cover. The opposite sides of the air guide fins are connected to the outer cover and the inner cover respectively and are arranged in a spaced manner along the circumference of the inner cover. Each of the guide vanes abuts with one of the air guide fins in the axial direction of the rotating shaft. The adjacent air guide fins define a second air duct. One of the air guide fins is provided with a lead-out wire slot which penetrates in the radial direction of the air outlet cover, or one of the guide vanes is provided with a lead-out wire slot which penetrates in the radial direction of the air outlet cover.

[0008] The rotating shaft is arranged inside the inner shell and the inner cover.

[0009] The stator is annularly arranged between the inner cover and the rotating shaft. The stator is connected with the lead-out wire which is arranged in the lead-out wire slot.

[0010] The motor according to the present application has at least the following beneficial effects:

[0011] The thickness of the guide vane on the air outlet side is increased, the bending degree of the guide vane extending from the air inlet side to the air outlet side is reduced, the airflow can flow along the guide vane smoothly, the air pressure area on the leeward side of the guide vane is reduced or even eliminated, the guide fin and the guide vane have sufficient thickness to set the lead slot, the lead-out wire connected to the stator is arranged in the lead slot and penetrates out of the machine shell, the lead-out wire in the motor is led out from the side, the cooperation and installation of the air outlet cover and the rotating shaft are facilitated, the influence of the lead-out wire on the airflow on the air outlet side of the motor is small, and the air pressure and air speed on the air outlet side can be ensured.

[0012] According to some embodiments of the present application, the thickness of the guide vane in the circumferential direction of the machine shell gradually increases in the direction towards the air outlet cover.

[0013] According to some embodiments of the present application, the guide vane comprises a first guide part and a second guide part, the second guide part is connected to one end of the first guide part towards the air outlet cover, the thickness of the first guide part in the circumferential direction of the machine shell gradually increases in the direction towards the air outlet cover, the second guide part extends in the axial direction of the machine shell, and the projection of one end of the first guide part towards the air outlet cover on the axial direction of the machine shell coincides with the second guide part.

[0014] According to some embodiments of the present application, one of the guide fins is provided with a lead slot penetrating in the radial direction of the air outlet cover, the lead slot penetrates to one side of the guide fin towards the guide vane and forms an opening, and the guide vane covers the opening.

[0015] According to some embodiments of the present application, the guide vane and the inner shell body are detachably connected, and / or the guide vane and the outer shell body are detachably connected.

[0016] According to some embodiments of the present application, the inner side of the inner cover is provided with a first limiting part, the outer circumferential surface of the stator is provided with a second limiting part, and the first limiting part and the second limiting part abut each other in the circumferential direction of the machine shell.

[0017] According to some embodiments of the present application, a plurality of limiting protrusions are arranged on one end of the stator away from the machine shell, the limiting protrusions are arranged in the circumferential direction of the air outlet cover at intervals, two of the limiting protrusions define a lead gap, the lead gap is in communication with the lead slot, and the lead-out wire is arranged in the lead gap and the lead slot.

[0018] According to some embodiments of the present application, the machine shell further comprises a guide part connected to one end of the inner shell body away from the air outlet cover, the guide part is located at one end of the guide vane away from the air outlet cover, in the direction towards the air outlet cover, the distance between the outer circumferential surface of the guide part and the outer shell body in the radial direction of the rotating shaft gradually decreases, and one end of the rotating shaft extends to one side of the guide part away from the air outlet cover.

[0019] The high-speed fan according to the second aspect of the present application comprises a motor according to the first aspect of the present application and a impeller, the impeller comprising:

[0020] an inner hub;

[0021] an outer hub, annularly arranged outside the inner hub;

[0022] a plurality of first blades, annularly arranged outside the outer hub;

[0023] a plurality of second blades, annularly arranged between the inner hub and the outer hub;

[0024] the outer casing is annularly arranged outside the impeller, and the inner hub is connected to the rotating shaft.

[0025] According to some embodiments of the present application, the outer circumferential surface of the inner hub gradually approaches the outer hub in the direction towards the air outlet cover, and / or the end surface of the outer hub away from the air outlet cover gradually approaches the outer casing in the direction towards the air outlet cover.

[0026] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0028] Figure 1 a structural schematic diagram of one embodiment of the motor in the present application;

[0029] Figure 2 a sectional view of the motor shown in the figure; Figure 1

[0030] Figure 3 a schematic diagram of the cooperation between the guide vanes and the air guide fins; Figure 2

[0031] Figure 4 a schematic diagram of the air outlet cover shown in the figure; Figure 1

[0032] Figure 5 a schematic diagram of the stator shown in the figure; Figure 1

[0033] Figure 6 a sectional view of one embodiment of the high-speed fan in the present application;

[0034] Figure 7 Figure 1 ​​​​​Schematic diagram of the impeller.

[0035] Reference signs:

[0036] Casing 100, inner casing 110, outer casing 120, guide vane 130, limiting hole 131, first guide section 132, second guide section 133, first air duct 140, guide part 150; air outlet cover 200, inner cover 210, support protrusion 211, first limiting part 212, outer cover 220, air guide fin 230, lead slot 231, opening 232, second air duct 240, limiting pin 250, stator 300; core 310, limiting protrusion 311, lead gap 312, winding 320, second limiting part 330; rotating shaft 400; bearing 500; impeller 600, inner hub 610, outer hub 620, first blade 630, second blade 640. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0038] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0039] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. is understood as not including the number, above, below, etc. is understood as including the number. If it is described as first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0040] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0041] In the description of the application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] An electric motor is provided in an embodiment of the application, with reference to Figure 1 With Figure 2 , the electric motor comprises a motor housing 100, an air outlet cover 200, a stator 300 and a rotating shaft 400, the motor housing 100 and the air outlet cover 200 are arranged along the axial direction of the rotating shaft 400, the motor housing 100 is connected to one end of the air outlet cover 200, the stator 300 and the rotating shaft 400 are both accommodated inside the motor housing 100 and the air outlet cover 200, and the stator 300 is annularly arranged between the inner cover 210 and the rotating shaft 400; the motor housing 100 comprises an inner housing 110, an outer housing 120 and a plurality of guide vanes 130, the outer housing 120 is annularly arranged outside the inner housing 110, the guide vanes 130 are located between the outer housing 120 and the inner housing 110, the guide vanes 130 are respectively connected to the inner housing 110 and the outer housing 120 on opposite sides in the radial direction of the motor housing 100, the plurality of guide vanes 130 are arranged at intervals along the circumferential direction of the inner housing 110, and adjacent guide vanes 130 define a plurality of first air channels 140 in the circumferential direction of the motor housing 100; in combination Figure 4 , the air outlet cover 200 comprises an inner cover 210, an outer cover 220 and a plurality of air guide fins 230, the outer cover 220 is annularly arranged outside the inner cover 210, the air guide fins 230 are located between the outer cover 220 and the inner cover 210, the air guide fins 230 extend along the axial direction of the outer cover 220, the air guide fins 230 are respectively connected to the outer cover 220 and the inner cover 210 on opposite sides in the radial direction of the air outlet cover 200, the plurality of air guide fins 230 are arranged at intervals along the circumferential direction of the inner cover 210, adjacent air guide fins 230 define a plurality of second air channels 240 in the circumferential direction of the air outlet cover 200, the number and arrangement interval of the guide vanes 130 and the air guide fins 230 are the same, one end of each guide vane 130 facing the air outlet cover 200 abuts against one air guide fin 230, and each first air channel 140 communicates with one second air channel 240 in the axial direction of the motor housing 100.

[0043] The motor in the embodiment is applied to a fan, the impeller 600 is installed at the end of the casing 100 which is away from the air outlet cover 200, thus the first air duct 140 is located at the air inlet side of the motor, the second air duct 240 is located at the air outlet side of the motor, the airflow generated by the rotation of the impeller 600 firstly enters the first air duct 140 from the end of the casing 100 which is away from the air outlet cover 200, and the airflow is guided by the guide vanes 130 to enter the second air duct 240 from the first air duct 140 and then is discharged. As shown in Figure 3 the guide vanes 130 near the air inlet side are curved, and the guide vanes 130 near the air outlet side are straight, so that the airflow generated by the impeller is guided by the guide vanes 130 to blow in the axial direction; generally, there is an air pressure area on the leeward side of the guide vanes 130 near the air outlet side, the airflow spirals in the air pressure area and generates turbulence, which affects the axiality and air pressure of the airflow, based on this, in the embodiment, the thickness of the end of the guide vanes 130 which is away from the air outlet cover 200 in the circumferential direction of the casing 100 is smaller than the thickness of the end of the guide vanes 130 which is close to the air outlet cover 200 in the circumferential direction of the casing 100, because the thickness of the guide vanes 130 near the air outlet side is increased, the curvature of the guide vanes 130 when extending from the air inlet side to the air outlet side is reduced, the airflow can flow along the guide vanes 130 smoothly, the air pressure area on the leeward side of the guide vanes 130 is reduced or even eliminated, and thus the axiality and air pressure of the airflow after being blown out are improved.

[0044] Further, because the thickness of the guide vanes 130 has a trend of increasing in the direction towards the air outlet cover 200, the guide vanes 130 and the air guide fins 230 both have sufficient thickness to provide the lead groove 231, the lead groove 231 can be provided on the guide vanes 130 or the air guide fins 230, and the lead groove 231 penetrates in the radial direction of the air outlet cover 200, the lead-out wire connected to the stator 300 is arranged in the lead groove 231, and the lead-out wire passes through the lead groove 231 to the outside of the casing 100. In this way, the lead-out wire in the motor is led out from the side part thereof, which facilitates the cooperation and installation of the air outlet cover 200 and the rotating shaft 400, the influence of the lead-out wire on the airflow at the air outlet side of the motor is small, and the air pressure and air speed at the air outlet side can be ensured. Figure 2 Fig. 4 shows the case that the guide vanes 130 and the air guide fins 230 are both provided with the lead groove 231.

[0045] It should be noted that the end of each guide vane 130 which is towards the air outlet cover 200 is projected on the circumferential direction of the casing 100 to coincide with the corresponding air guide fin 230, thus the two side surfaces of the guide vanes 130 and the air guide fins 230 which are opposite in the circumferential direction of the rotating shaft 400 are flush, so as to reduce the air resistance at the communication part between the first air duct 140 and the second air duct 240, and to ensure the axiality, air pressure and air speed of the airflow after being blown out.

[0046] As shown in Figure 2As shown, the shell 100 further comprises a guide portion 150 connected to one end of the inner housing 110 away from the air outlet cover 200, the shaft 400 is arranged in the guide portion 150 near the air inlet side, and the shaft 400 is arranged in the air outlet cover 200 near the air outlet side. The motor further comprises bearings 500 arranged between the shaft 400 and the guide portion 150 and between the shaft 400 and the air outlet cover 200, the bearings 500 are rotatably connected with the shaft 400 and support the shaft 400. Since both ends of the shaft 400 are supported by the bearings 500, the axiality and perpendicularity of the shaft 400 are high, and the shaft 400 is not easy to deform during installation. It can be understood that a plurality of bearings 500 can be arranged between the shaft 400 and the guide portion 150 and between the shaft 400 and the air outlet cover 200, and the plurality of bearings 500 are combined for use, which can improve the support effect on the shaft 400 and axially limit the shaft 400.

[0047] It should be noted that since the lead-out wire in the present application is led out radially from the air outlet cover 200, the end of the air outlet cover 200 away from the shell 100 has a large space for installing the bearing 500, which makes the assembly of the bearing 500 and the air outlet cover 200 more convenient.

[0048] In addition, the stator 300 comprises a core 310 and a winding 320, the winding 320 is installed on the inner side of the core 310 and is arranged around the outer periphery of the shaft 400, one end of the core 310 near the air inlet side abuts against the guide portion 150, and the other end of the core 310 near the air outlet side abuts against the air outlet cover 200, so that the stator 300 is fixed axially between the guide portion 150 and the air outlet cover 200. Further, Figure 4 With Figure 5 , the end of the core 310 away from the shell 100 is provided with a plurality of limiting protrusions 311, the limiting protrusions 311 are arranged in a spaced manner along the circumference of the air outlet cover 200, and two limiting protrusions 311 define a lead-out gap 312. When the lead-out slot 231 is arranged in the air guide fin 230, the lead-out gap 312 communicates with the lead-out slot 231, the lead-out wire led out by the winding 320 is arranged in the lead-out gap 312 and the lead-out slot 231, and is led out to the outside of the air outlet cover 200. By arranging the limiting protrusions 311, on the one hand, the limiting protrusions 311 abut against the air outlet cover 200, and on the other hand, the lead-out gap is provided for the lead-out wire.

[0049] Further, Figure 4 As shown, the inner side of the inner cover 210 is further provided with a supporting protrusion 211, the supporting protrusion 211 abuts against the limiting protrusion 311 in the axial direction, and a plurality of supporting protrusions 211 are arranged in a spaced manner along the circumference of the inner cover 210. The gap between adjacent supporting protrusions 211 communicates with the lead-out gap 312, thereby increasing the threading space of the lead-out wire and facilitating the lead-out of the lead-out wire.

[0050] In one embodiment, as shown in Figure 4 The lead slot 231 penetrates through the air guide fin 230 to the side of the air guide fin 230 facing the guide vane 130, and forms an opening 232 on the side of the air guide fin 230 facing the rotating shaft 400, and the guide vane 130 abuts the cover to seal the opening 232; when the lead wire is drawn out, the opening 232 in the axial direction of the lead slot 231 provides a space for the tool or the operator's hand to enter, facilitating the lead wire to pass out; after the lead wire passes out, the machine shell 100 and the air outlet cover 200 are assembled, and the opening 232 is blocked.

[0051] It should be noted that, in order to prevent the lead wire from retracting after passing out, a wire fixing member can be inserted into the lead slot 231 through the opening 232, and the wire fixing member fixes the lead wire in the lead slot 231, preventing the lead wire from being pulled and entangled or broken; alternatively, a wire fixing member can be pre-installed in the lead slot 231, and the lead wire is fixed in the wire fixing member through the opening 232 when passing through. The wire fixing member can be a cable tie or an elastic clamping piece.

[0052] Since the air guide fin 230 and the guide vane 130 on the air outlet side both have a certain thickness, in one embodiment, a limiting pin 250 is protrudingly arranged on the side of the air guide fin 230 facing the machine shell 100, and the limiting pin 250 does not exceed the side surface of the air guide fin 230 in the circumferential direction of the inner cover 210, and a limiting hole 131 is arranged on the end of the guide vane 130 facing the air outlet cover 200, and the limiting pin 250 is inserted into the limiting hole 131, so that the machine shell 100 and the air outlet cover 200 are limited in the circumferential direction.

[0053] Further, in the embodiment of the present application, a first limiting portion 212 is arranged on the inner side of the inner cover 210, and a second limiting portion 330 is arranged on the outer circumferential surface of the stator 300, the first limiting portion 212 and the second limiting portion 330 abut each other in the circumferential direction of the machine shell 100, achieving the effect of limiting the inner cover 210 and the machine shell 100 in the circumferential direction; by limiting the inner cover 210 and the machine shell 100 in the circumferential direction, the position of the lead slot 231 and the lead gap 312 correspond and communicate, facilitating the lead wire to pass out.

[0054] In one embodiment, the first limiting portion 212 is recessed to form a groove body relative to the outer circumferential surface of the stator 300 facing the rotating shaft 400, and the second limiting portion 330 is protrudingly arranged to form a protruding structure relative to the inner side of the inner cover 210 facing the rotating shaft 400, and the first limiting portion 212 and the second limiting portion 330 both extend in the axial direction of the rotating shaft 400, and after the second limiting portion 330 is embedded in the first limiting portion 212, the circumferential limiting of the two is achieved.

[0055] In one embodiment, the thickness of the guide vane 130 in the circumferential direction of the casing 100 gradually increases in the direction towards the air outlet cover 200, and the guide vane 130 is gradually tapered in the axial direction of the rotating shaft 400. The guide vane 130 on the air inlet side is curved, and the guide vane 130 on the air outlet side extends in the axial direction, so as to guide the airflow and ensure the air pressure and air speed on the air outlet side of the guide vane 130.

[0056] As shown in Figure 3 the guide vane 130 includes a first guide section 132 and a second guide section 133. The second guide section 133 is connected to one end of the first guide section 132 towards the air outlet cover 200. The thickness of the first guide section 132 in the circumferential direction of the casing 100 gradually increases in the direction towards the air outlet cover 200. The second guide section 133 extends in the axial direction of the casing 100. The projection of the one end of the first guide section 132 towards the air outlet cover 200 and the second guide section 133 in the circumferential direction of the casing 100 coincides. Thus, the second guide section 133 is equal in thickness in the axial direction. The thickness of the one end of the first guide section 132 towards the air outlet cover 200 is equal to the thickness of the second guide section 133. The perpendicularity of the second guide section 133 in the axial direction is high. The guidance of the first guide section 132 and the second guide section 133 can improve the axial degree and air pressure of the airflow.

[0057] It should be noted that the guide vane 130 and the inner casing 110 are detachably connected, and / or the guide vane 130 and the outer casing 120 are detachably connected. The casing 100 can be formed by assembly, so as to facilitate the maintenance of the casing 100 and the processing of the guide vane 130, the inner casing 110 and the outer casing 120. Specifically, the connection mode between the guide vane 130 and the inner casing 110 and between the guide vane 130 and the outer casing 120 can be that recesses are arranged on the inner casing 110 and the outer casing 120, and the guide vane 130 is inserted into the recesses, so that the guide vane 130 and the inner casing 110 and the outer casing 120 are limited in the circumferential direction, and no additional structure is needed, and the air volume entering the first air duct 140 is not affected.

[0058] In addition, the guide portion 150 is located at one end of the guide vane 130 away from the air outlet cover 200. In the direction towards the air outlet cover 200, the distance between the outer peripheral surface of the guide portion 150 and the outer casing 120 in the radial direction of the rotating shaft 400 gradually decreases. One end of the rotating shaft 400 extends to one end of the guide portion 150 away from the air outlet cover 200, so as to connect the impeller 600. Since the guide portion 150 is arranged obliquely and the guide portion 150 is located on the air inlet side of the guide vane 130, the space on the air inlet side of the motor is large, and more airflow can enter the first air duct 140, so as to improve the air volume on the air outlet side of the motor. In addition, the guide portion 150 can guide the entering airflow into the first air duct 140, so as to reduce the air resistance and noise of the airflow.

[0059] In the embodiment of the present application, a high-speed fan is provided, as shown in Figure 6 andFigure 7 As shown, the high-speed fan includes the impeller 600 and the motor as described above. After the lead wire is connected to the power supply, the rotating shaft 400 can rotate, and the motor provides power for the rotation of the impeller 600, so that the impeller 600 generates airflow. Specifically, the impeller 600 includes an inner hub 610, an outer hub 620, first blades 630, and second blades 640. The inner hub 610 is connected to the rotating shaft 400 and rotates with the rotating shaft 400. The outer hub 620 is annularly arranged outside the inner hub 610. The first blades 630 are arranged in a plurality of numbers and are spaced apart along the outer circumferential surface of the outer hub 620. The second blades 640 are connected between the inner hub 610 and the outer hub 620 and are arranged in a plurality of numbers and are spaced apart along the circumferential direction of the inner hub 610.

[0060] Since the first blades 630 and the second blades 640 are respectively located on both sides of the outer hub 620 in the radial direction, external air can enter between the outer hub 620 and the outer shell 120 and between the outer hub 620 and the inner hub 610, thereby increasing the air volume entering the fan. After the airflow generated by the rotation of the impeller 600 is guided by the guide vanes 130, the air pressure and air speed of the fan can be further improved.

[0061] In one embodiment, the first blades 630 are arranged as axial-flow blades or diagonal-flow blades, and the second blades 640 are arranged as centrifugal blades. The air entering between the first hub and the second hub has a tendency to flow in the radial direction under the rotation of the centrifugal blades, which facilitates the combination of the airflow generated by the second blades 640 and the airflow generated by the first blades 630. The airflow generated by the rotation of the first blades 630 flows in the axial direction, and under the driving of the airflow, the airflow enters the first air duct 140 and then enters the second air duct 240 and is guided out under the guidance of the guide vanes 130. By arranging double-layer blades in the radial direction and combining axial-flow blades / diagonal-flow blades with centrifugal blades, the air volume and air speed of the fan are improved, and the rotation speed of the rotating shaft 400 can be reduced, thereby improving the air outlet efficiency of the fan.

[0062] The outer circumferential surface of the inner hub 610 gradually approaches the outer hub 620 in the direction toward the air outlet cover 200. The outer circumferential surface of the inner hub 610 guides the airflow entering between the inner hub 610 and the outer hub 620 and directs the airflow to the outside of the outer hub 620, thereby facilitating the mixing of the airflow. The end surface of the outer hub 620 away from the air outlet cover 200 gradually approaches the outer shell 120 in the direction toward the air outlet cover 200. The end surface of the air outlet cover 200 guides the air outside the fan, so that more air enters between the inner hub 610 and the outer hub 620, thereby increasing the air volume.

[0063] As Figure 6As shown, the edge of the outer circumferential surface of the guide portion 150 radially inside is located inside the inner hub 610, and the edge of the outer circumferential surface of the guide portion 150 radially outside extends to the outer housing 120, so that the air flow flowing out from between the inner hub 610 and the outer hub 620 and between the outer hub 620 and the outer housing 120 can be guided by the outer circumferential surface of the guide portion 150, and the air flow is introduced into the first air duct 140, and the air resistance and noise of the air flow can be reduced.

[0064] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. An electric machine characterized in that, The application relates to a fan, which comprises a casing, an air outlet cover and a stator. The casing comprises an inner casing body, an outer casing body and a plurality of guide vanes, the outer casing body is arranged around the outer portion of the inner casing body, the opposite sides of the guide vanes are connected to the inner casing body and the outer casing body respectively, and the guide vanes are arranged in a circumferential direction of the inner casing body, and adjacent guide vanes define a first air duct. The air outlet cover is connected to one end of the casing, and the air outlet cover comprises an inner cover, an outer cover and a plurality of air guide fins, the outer cover is arranged around the outer portion of the inner cover, a rotating shaft is arranged in the inner portion of the inner casing body and the inner cover, the air guide fins extend in the axial direction of the outer cover, the opposite sides of the air guide fins are connected to the outer cover and the inner cover respectively, and the air guide fins are arranged in a circumferential direction of the inner cover, the thickness of one end of the guide vanes away from the air outlet cover in the circumferential direction of the casing is smaller than the thickness of the other end of the guide vanes close to the air outlet cover in the circumferential direction of the casing, each guide vane is in abutment with one air guide fin in the axial direction of the rotating shaft, and adjacent air guide fins define a second air duct, one air guide fin is provided with a lead slot which penetrates in the radial direction of the air outlet cover, or one guide vane is provided with a lead slot which penetrates in the radial direction of the air outlet cover. The stator is arranged between the inner cover and the rotating shaft, the stator is connected with a lead-out wire, the lead-out wire is arranged in the lead slot, one end of the stator away from the casing is provided with a plurality of limiting protrusions which are arranged in a circumferential direction of the air outlet cover, two limiting protrusions define a lead gap, the lead gap is in communication with the lead slot, and the lead-out wire is arranged in the lead gap and the lead slot.

2. The electric machine of claim 1, wherein, The thickness of the guide vanes in the circumferential direction of the casing gradually increases in the direction towards the air outlet cover.

3. The electric machine of claim 1, wherein, The guide vanes comprise a first guide portion and a second guide portion, the second guide portion is connected to one end of the first guide portion away from the air outlet cover, the thickness of the first guide portion in the circumferential direction of the casing gradually increases in the direction towards the air outlet cover, the second guide portion extends in the axial direction of the casing, and the projection of one end of the first guide portion away from the air outlet cover in the axial direction of the casing is coincident with the second guide portion.

4. The electric machine of claim 1, wherein, One air guide fin is provided with a lead slot which penetrates in the radial direction of the air outlet cover, the lead slot penetrates to the side of the air guide fin away from the guide vane and forms an opening, and the guide vane covers the opening.

5. The electric machine of claim 1, wherein, The guide vanes and the inner casing body are detachably connected, and / or the guide vanes and the outer casing body are detachably connected.

6. The electric machine of claim 1, wherein, The inner side of the inner cover is provided with a first limiting portion, the outer circumferential surface of the stator is provided with a second limiting portion, and the first limiting portion and the second limiting portion are in abutment with each other in the circumferential direction of the casing.

7. The electric machine of claim 1, wherein, The casing further comprises a guide portion which is connected to one end of the inner casing body away from the air outlet cover, the guide portion is located at one end of the guide vanes away from the air outlet cover, in the direction towards the air outlet cover, the distance between the outer circumferential surface of the guide portion and the outer casing body in the radial direction of the rotating shaft gradually decreases, and one end of the rotating shaft extends to the side of the guide portion away from the air outlet cover.

8. A high speed fan characterized by The application further relates to a fan impeller, which comprises an inner hub, an outer hub and a plurality of guide vanes. ​ An outer hub is annularly arranged outside the inner hub; A plurality of first vanes are arranged and spaced along the outer circumferential surface of the outer hub; A plurality of second vanes are connected between the inner hub and the outer hub, and are spaced along the circumferential direction of the inner hub; The high-speed fan further comprises the motor according to any one of claims 1 to 7, the outer shell is annularly arranged outside the impeller, and the inner hub is connected to the rotating shaft.

9. The high speed fan of claim 8, wherein, The outer circumferential surface of the inner hub gradually approaches the outer hub in a direction towards the air outlet cover, and / or an end surface of the outer hub away from the air outlet cover gradually approaches the outer shell in a direction towards the air outlet cover.

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