Outer rotor fan

Abstract

The utility model discloses a bearing assembly, a rotor assembly and an outer rotor fan, the bearing assembly comprises a sleeve, a rotating shaft and a plurality of rolling pieces, and the rotating shaft penetrates through the sleeve; the plurality of rolling pieces are arranged between the rotating shaft and the sleeve, and the rolling pieces are in rolling connection with the rotating shaft and the sleeve. According to the bearing assembly provided by the embodiment of the utility model, the rotating shaft is directly matched with the sleeve and the rolling piece, so that the rotating shaft and the bearing can form an integrated structure, the structure is simplified, and the assembly is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of external rotor fans, in particular to an external rotor fan. Background Art

[0002] In related technologies, bearings are used to support the rotation of rotating shafts. Bearings generally include an inner ring, an outer ring and rolling elements. The rolling elements are arranged between the inner ring and the outer ring. When used, the inner ring of the bearing is sleeved on the outer periphery of the rotating shaft, and the structure is relatively complex. Utility Model Content

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the present invention is to provide an outer rotor fan.

[0004] According to the external rotor fan of the embodiment of the present utility model, it includes: a casing, a rotor assembly, a stator assembly, a corrugated washer, a fan blade and a retaining spring, and the rotor assembly is arranged in the casing; the rotor assembly includes: a shell, a bearing assembly and a sleeve, the bearing assembly includes a sleeve, a rotating shaft, a plurality of rolling members and a dust cover, and the rotating shaft is passed through the sleeve; the plurality of rolling members are arranged between the rotating shaft and the sleeve, and the rolling members are rollingly connected to the rotating shaft and the sleeve; an oil storage cavity is constructed between the sleeve and the rotating shaft, and the rolling members are arranged in the oil storage cavity; the dust cover is arranged between the inner circumference of the sleeve and the outer circumference of the rotating shaft, and covers the rolling members, and the dust cover has a clearance fit or interference fit with the rotating shaft; the dust cover includes a curved portion and a flat plate portion, the curved portion is connected to the flat plate portion, the curved portion is connected to the sleeve, and the flat plate portion The plate portion extends in a direction perpendicular to the rotating shaft and the end of the flat portion is opposite to the rotating shaft; the outer wall of the sleeve is fixedly connected to the housing, and the inner wall of the sleeve is connected to the bearing assembly; the stator assembly is arranged on the inner side of the housing, and the stator assembly includes a bearing seat, and the rotating shaft passes through the bearing seat; the wave washer is supported between the bearing assembly and the bearing seat; the fan blade is fixedly connected to the rotor assembly; the retaining spring is sleeved on the outer periphery of the rotating shaft, and the rotating shaft includes a first section, a second section and a transition section, the first section and the second section are connected to the opposite sides of the transition section along the axial direction of the rotating shaft, and the outer peripheral surface of the second section of the rotating shaft is provided with a positioning groove, the diameter of the first section is smaller than the diameter of the second section, and the transition section gradually expands outward from the first section to the second section, and a part of the retaining spring extends into the positioning groove.

[0005] According to the outer rotor fan of the embodiment of the present invention, the rotating shaft and the bearing can be constructed into an integrated structure by directly matching the rotating shaft with the sleeve and the rolling element, which is conducive to simplifying the structure and facilitating assembly. It can simplify the structure of the outer rotor fan and improve operational stability.

[0006] In addition, the outer rotor fan according to the above embodiment of the present invention may also have the following additional technical features:

[0007] In some examples of the present invention, the inner circumference of the sleeve is provided with a first groove portion surrounding the rotating shaft, the outer circumference of the rotating shaft is provided with a second groove portion corresponding to the first groove portion, the first part of the rolling element is provided in the first groove portion, and the second part is provided in the second groove portion.

[0008] In some examples of the present invention, the bearing assembly further includes a dust cover, which is disposed between the inner circumference of the sleeve and the outer circumference of the rotating shaft and covers the rolling element, and the dust cover has a clearance fit or an interference fit with the rotating shaft.

[0009] In some examples of the present invention, the bearing assembly further includes a retaining frame, which is disposed in a gap between the sleeve and the rotating shaft and supported on an outer periphery of the rolling element.

[0010] In some examples of the present invention, an oil storage cavity is constructed between the sleeve and the rotating shaft, and the rolling element is arranged in the oil storage cavity.

[0011] In some examples of the present invention, the plurality of rolling elements include a plurality of first rolling bodies and a plurality of second rolling bodies, and the plurality of first rolling bodies and the plurality of second rolling bodies are arranged at intervals along an extending direction of the rotating shaft.

[0012] In some examples of the present invention, the sleeve has a first end and a second end relative to each other, the multiple first rolling elements are closer to the first end of the rotating shaft than the multiple second rolling elements, and the multiple second rolling elements are closer to the second end of the rotating shaft than the multiple first rolling elements.

[0013] In some examples of the present invention, the bearing assembly further includes: a first dust cover and a second dust cover, the first dust cover covers the first end of the rotating shaft and the sleeve, and the second dust cover covers the second end of the rotating shaft and the sleeve.

[0014] In some examples of the present invention, the bearing assembly further includes: a first retaining frame and a second retaining frame, the first retaining frame being arranged in the gap between the sleeve and the rotating shaft and supported on the outer periphery of the plurality of first rolling elements, and the second retaining frame being arranged in the gap between the sleeve and the rotating shaft and supported on the outer periphery of the plurality of second rolling elements.

[0015] In some examples of the present invention, the inner circumference of the sleeve is provided with a first annular groove surrounding the rotating shaft, the outer circumference of the rotating shaft is provided with a second annular groove corresponding to the first annular groove, the first part of the multiple first rolling bodies is provided in the first annular groove, and the second part is provided in the second annular groove.

[0016] In some examples of the present invention, the inner circumference of the sleeve is provided with a third annular groove surrounding the rotating shaft, the outer circumference of the rotating shaft is provided with a fourth annular groove corresponding to the third annular groove, the first part of the multiple second rolling bodies is provided in the third annular groove, and the second part is provided in the fourth annular groove.

[0017] In some examples of the present invention, the rotor assembly further includes: a bracket, and a plurality of permanent magnets, wherein the plurality of permanent magnets are arranged on the bracket at intervals along the circumference of the bracket, and the outer walls of the permanent magnets are in contact with the inner wall of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a bearing assembly in some embodiments of the present invention;

[0019] Figure 2 is a schematic structural diagram of a bearing assembly in some embodiments of the present invention (the first rolling element, the second rolling element, the first retaining frame and the second retaining frame are not shown);

[0020] Figure 3 is a schematic structural diagram of a rotor assembly in some embodiments of the present invention;

[0021] Figure 4 It is a schematic structural diagram of an outer rotor fan in some embodiments of the present invention;

[0022] Figure 5 yes Figure 4 A partial enlarged view of the middle circle A.

[0023] Reference numerals:

[0024] 10. Bearing assembly; 11. Sleeve; 101. First annular groove; 103. Third annular groove; 12. Rotating shaft; 102. Second annular groove; 104. Fourth annular groove; 106. Positioning groove; 13. Rolling element; 131. First rolling element; 132. Second rolling element; 110. Oil storage chamber; 141. First dust cover; 142. Second dust cover; 151. First retaining frame; 152. Second retaining frame; 16. Housing; 17. Bushing; 181. Bracket; 182. Permanent magnet; 100. Rotor assembly; 200. Stator assembly; 210. Bearing seat; 300. Casing; 400. Wave washer; 500. Fan blade; 600. Electrical control box; 700. Air inlet ring; 800. Bottom plate; 900. Circlip; 1000. External rotor fan. DETAILED DESCRIPTION

[0025] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] Combine Figure 1 and Figure 2 According to an embodiment of the present invention, a bearing assembly 10 is used in a rotor assembly 100 and includes a sleeve 11, a rotating shaft 12, and a plurality of rolling elements 13. The rotating shaft 12 is disposed through the sleeve 11; the plurality of rolling elements 13 are disposed between the rotating shaft 12 and the sleeve 11, and the rolling elements 13 are in rolling connection with the rotating shaft 12 and the sleeve 11. In other words, the rolling elements 13 are rollably disposed between the outer periphery of the rotating shaft 12 and the inner periphery of the sleeve 11. Thus, the sleeve 11, the outer periphery of the rotating shaft 12, and the plurality of rolling elements 13 form a bearing structure, simplifying the mating structure between the bearing and the rotating shaft 12.

[0027] Specifically, under normal circumstances, a bearing is provided around the outer periphery of the rotating shaft 12. The bearing can support the rotating shaft 12, reduce friction, and increase axial load-bearing capacity. In related art, a bearing includes an inner ring, an outer ring, and a rolling element. The rolling element is disposed between the inner and outer rings. When in use, the inner ring of the bearing is disposed around the outer periphery of the rotating shaft. The present application proposes a bearing assembly 10 in which a rolling element 13 can be directly connected to the outer periphery of the rotating shaft 12 in a rolling manner. Thus, the rotating shaft 12 body can be used to construct a bearing structure, thereby simplifying the matching structure between the rotating shaft 12 and the bearing, improving the structural compactness, and constructing the rotating shaft 12 and the bearing into an integrated structure.

[0028] According to the bearing assembly 10 of the embodiment of the present invention, the rotating shaft 12 is directly matched with the sleeve 11 and the rolling element 13, so that the rotating shaft 12 and the bearing can be constructed into an integrated structure, which is conducive to simplifying the structure and facilitating assembly.

[0029] Combine Figure 1 and Figure 2 In some embodiments of the present invention, the inner circumference of the sleeve 11 is provided with a first groove portion surrounding the rotating shaft 12, and the outer circumference of the rotating shaft 12 is provided with a second groove portion corresponding to the first groove portion. The first part of the rolling element 13 is provided in the first groove portion, and the second part is provided in the second groove portion. In this way, the rolling element 13 can be confined between the rotating shaft 12 and the sleeve 11, playing a limiting role, and can also increase the contact area between the rolling element 13 and the rotating shaft 12 and the sleeve 11, thereby improving the stability of the rolling element 13 when rolling.

[0030] Combine Figure 1 In some embodiments of the present invention, the bearing assembly 10 further includes a dust cover, which is disposed between the inner circumference of the sleeve 11 and the outer circumference of the rotating shaft 12 and covers the rolling element 13. The dust cover can prevent external dust from entering the sleeve 11 and can also prevent grease leakage from the rolling element 13 in the sleeve 11 for lubrication, thereby improving the operational stability of the bearing assembly 10. More specifically, the dust cover has a clearance fit or an interference fit with the rotating shaft 12. The dust cover includes a curved portion and a flat portion, the curved portion being connected to the flat portion, the curved portion being connected to the sleeve 11, the flat portion extending in a direction perpendicular to the rotating shaft 12, and the end of the flat portion being opposite to the rotating shaft 12.

[0031] The matching mode of the dust cover and the rotating shaft 12 can be set according to actual usage conditions or the material of the dust cover. For example, when the dust cover is made of rubber, one end of the dust cover is connected to the sleeve 11 and the other end is interference fit with the rotating shaft 12; when the dust cover is made of iron, one end of the dust cover is connected to the sleeve 11 and the other end is clearance fit with the rotating shaft 12, or one end of the dust cover is connected to the sleeve 11 and the other end is in light contact with the rotating shaft 12.

[0032] In some embodiments of the present invention, the bearing assembly 10 further includes a retainer, which is positioned in the gap between the sleeve 11 and the rotating shaft 12 and supported on the outer periphery of the rolling element 13. Specifically, the retainer prevents the rolling element 13 from misaligning or contacting during movement, thereby improving the performance and service life of the bearing assembly 10. Specifically, a rolling element 13 may be composed of multiple rolling elements, which are arranged circumferentially around the outer periphery of the rotating shaft 12. The retainer connects the multiple rolling elements to maintain each rolling element in a predetermined position for rotation, thereby improving stability during use.

[0033] Combine Figure 1 and Figure 2In some embodiments of the present invention, an oil storage chamber 110 is constructed between the sleeve 11 and the rotating shaft 12, and the rolling element 13 is arranged in the oil storage chamber 110. Grease can be stored in the oil storage chamber 110. The contact between the grease and the rolling element 13 can provide lubrication for the rolling element 13, which is beneficial to improving the operating performance of the bearing assembly 10 and increasing the service life of the bearing assembly 10. Since the bearing assembly 10 is an integrated structure, the inner ring structure that cooperates with the rotating shaft 12 is omitted, and the oil storage space can be increased, thereby facilitating an increase in the oil storage amount, which can improve the lubrication effect and working stability, and can also reduce the frequency of maintenance, thereby improving operating efficiency. Specifically, in the related art, the outer shaft of the rotating shaft is generally sleeved with the bearing, and the grease can only be stored between the inner ring and the outer ring of the bearing. In the present application, the rotating shaft 12 is directly matched with the sleeve 11, and there is no need to set up an inner ring structure. The space between the rotating shaft 12 and the sleeve 11 can be used for oil storage, thereby increasing the oil storage space of the oil storage chamber 110.

[0034] More specifically, in some embodiments of the present invention, the plurality of rolling elements 13 include a plurality of first rolling bodies 131 and a plurality of second rolling bodies 132, and the plurality of first rolling bodies 131 and the plurality of second rolling bodies 132 are spaced apart along the extension direction of the rotating shaft 12. The plurality of first rolling bodies 131 are spaced apart along the circumference of the rotating shaft 12, the plurality of second rolling bodies 132 are spaced apart along the circumference of the rotating shaft 12, and the plurality of first rolling bodies 131 and the plurality of second rolling bodies 132 are spaced apart along the axial direction of the rotating shaft 12. In this way, the plurality of rolling elements 13 can effectively support the axial and radial loads on the rotating shaft 12, thereby reducing wear and improving load-bearing capacity. In addition, the simultaneous provision of the plurality of first rolling bodies 131 and the plurality of second rolling bodies 132 arranged axially in the bearing assembly 10 can also simplify the structure of the bearing assembly 10. In the related art, in order to improve the axial and radial supporting force of the rotating shaft, two bearings need to be set in the axial direction of the rotating shaft respectively. In the present application, the effect of setting two bearings in the related art can be achieved by setting multiple rolling elements 13. In addition, the bearing assembly 10 in the present application has a simpler structure, and the interval arrangement of the first rolling body 131 and the second rolling body 132 can further increase the oil storage space of the oil storage chamber 110.

[0035] Combine Figure 1In some embodiments of the present invention, the sleeve 11 has a first end and a second end relative to each other, and the plurality of first rolling elements 131 are closer to the first end of the rotating shaft 12 than the plurality of second rolling elements 132, and the plurality of second rolling elements 132 are closer to the second end of the rotating shaft 12 than the plurality of first rolling elements 131. This can improve the compactness of the structure and help improve the supporting effect of the rolling elements on the rotating shaft 12. Specifically, the first rolling elements 131 and the second rolling elements 132 are respectively arranged at opposite ends of the sleeve 11 or at positions close to the ends of the sleeve 11. In this way, when the axial spacing between the first rolling elements 131 and the second rolling elements 132 is small, the size of the sleeve 11 will also be small, which is conducive to simplifying the structure and improving the compactness of the structure. Specifically, the distance between the first rolling elements 131 and the second rolling elements 132 can be determined based on the axial and radial loads borne by the rotating shaft 12, or based on factors such as the size or rotation speed of the rotating shaft 12.

[0036] Combine Figure 1 In some embodiments of the present invention, the bearing assembly 10 further includes a first dust cover 141 and a second dust cover 142. The first dust cover 141 covers the first end of the rotating shaft 12 and the sleeve 11, and the second dust cover 142 covers the second end of the rotating shaft 12 and the sleeve 11. The first dust cover 141 and the second dust cover 142 can seal the opposite ends of the sleeve 11, thereby preventing dust, moisture, or impurities from entering the interior of the bearing assembly 10, protecting the bearing from contamination, and extending its service life. Alternatively, the dust cover can be used to prevent dust, moisture, or impurities from entering the oil storage chamber 110, preventing grease in the oil storage chamber 110 from leaking, etc., thereby extending its service life.

[0037] Further, combined with Figure 1 In some embodiments of the present invention, the bearing assembly 10 further includes: a first retaining frame 151 and a second retaining frame 152, the first retaining frame 151 and the second retaining frame 152 are respectively used to support multiple first rolling elements 131 and multiple second rolling elements 132, to ensure that the multiple first rolling elements 131 and the multiple second rolling elements 132 roll at predetermined positions, thereby improving operational stability.

[0038] Specifically, the first retaining frame 151 is arranged in the gap between the sleeve 11 and the rotating shaft 12 and is supported on the outer periphery of the plurality of first rolling elements 131 . The second retaining frame 152 is arranged in the gap between the sleeve 11 and the rotating shaft 12 and is supported on the outer periphery of the plurality of second rolling elements 132 .

[0039] Furthermore, combined Figure 2In some embodiments of the present invention, the inner circumference of the sleeve 11 is provided with a first annular groove 101 surrounding the rotating shaft 12, and the outer circumference of the rotating shaft 12 is provided with a second annular groove 102 corresponding to the first annular groove 101. The first portions of the plurality of first rolling elements 131 are provided in the first annular groove 101, and the second portions are provided in the second annular groove 102. The first annular groove 101 and the second annular groove 102 are in contact with the first rolling elements 131, which not only limits the position of the first rolling elements 131 but also improves the ability to withstand mechanical loads.

[0040] Similarly, the inner circumference of the sleeve 11 is provided with a third annular groove 103 surrounding the rotating shaft 12, and the outer circumference of the rotating shaft 12 is provided with a fourth annular groove 104 corresponding to the third annular groove 103. The first portion of the plurality of second rolling elements 132 is provided in the third annular groove 103, and the second portion is provided in the fourth annular groove 104. The third annular groove 103 and the fourth annular groove 104 are in contact with the second rolling elements 132, which not only defines the position of the second rolling elements 132 but also improves the ability to withstand mechanical loads.

[0041] Combine Figure 3 According to an embodiment of the present invention, the rotor assembly 100 includes a housing 16, the aforementioned bearing assembly 10 and a sleeve 17. The outer wall of the sleeve 17 is fixedly connected to the housing 16, and the inner wall of the sleeve 17 is connected to the bearing assembly 10, so that the bearing assembly 10 can be assembled on the housing 16 through the sleeve 17. The rotation of the rotating shaft 12 can drive the rotor assembly 100 to rotate.

[0042] According to the rotor assembly 100 of the embodiment of the present invention, the structure of the rotor assembly 100 can be simplified by applying the aforementioned bearing assembly 10 in the rotor assembly 100 .

[0043] Specifically, in related technologies, the rotor assembly typically uses two ball bearings, one at each end of the bearing housing, to support the rotor and balance the axial force of the fan blades. Using two bearings for assembly can easily cause jamming. Furthermore, the two single bearings have limited grease storage space, which can lead to insufficient grease content over long periods of operation, resulting in insufficient oil supply and poor lubrication, causing fan failure and shortening bearing life. In order to improve fan assembly accuracy and extend fan service life, a new method was developed. The present application proposes a bearing assembly 10 that adopts an integrated bearing solution, and utilizes the outer periphery of the rotating shaft 12 and the inner periphery of the sleeve 11 to construct the inner ring and outer ring of the bearing structure, thereby eliminating the inner ring structure of the bearing in the related art. In addition, the bearing assembly 10 of the present application includes a plurality of first rolling elements 131 and a plurality of second rolling elements 132 arranged axially at intervals along the rotating shaft 12, thereby achieving the effect that can be achieved by two bearings in the related art, but the space for storing grease in the two single bearings in the related art is relatively small. In the bearing assembly 10 of the present application, the interval space between the first rolling element 131 and the second rolling element 132 can be used to store grease, thereby increasing the oil storage capacity, and thus increasing the service life of the rotor assembly 100.

[0044] More specifically, the outer wall of the sleeve 17 or the outer ring of the sleeve 17 is welded to the housing 16, and the inner wall of the sleeve 17 or the inner ring of the sleeve 17 is interference-connected to the bearing assembly 10, which can improve structural stability and operational stability.

[0045] Combine Figure 3 In some embodiments of the present invention, rotor assembly 100 further includes a bracket 181 and a plurality of permanent magnets 182. The plurality of permanent magnets 182 are spaced apart circumferentially around bracket 181, with the outer walls of the permanent magnets 182 abutting against the inner wall of housing 16. Specifically, bracket 181 can be used to position the permanent magnets 182 and evenly arrange the plurality of permanent magnets 182. This allows for more uniform spacing between the permanent magnets 182 along the circumference, thereby improving the functionality and operational stability of rotor assembly 100.

[0046] Combine Figure 4 and Figure 5According to an embodiment of the present invention, the outer rotor fan 1000 includes: a casing 300, the aforementioned rotor assembly 100, a stator assembly 200, a wave washer 400, and a fan blade 500. The rotor assembly 100 is arranged in the casing 300, and the fan blade 500 is fixedly connected to the rotor assembly 100. The rotor assembly 100 can drive the fan blade 500 to rotate. The stator assembly 200 is arranged on the inner side of the housing 16. The stator assembly 200 includes a bearing seat 210. The rotating shaft 12 passes through the bearing seat 210 to connect the rotor assembly 100 to the stator assembly 200. More specifically, the wave washer 400 is supported between the bearing assembly 10 and the bearing seat 210, and can adjust the axial preload of the rotor assembly 100, thereby improving the structural stability. Optionally, the fan blade 500 can be fastened to the rotor assembly 100 by screws.

[0047] According to an embodiment of the present invention, the outer rotor blower 1000 is provided with the aforementioned rotor assembly 100, thereby simplifying the structure of the outer rotor blower 1000 and improving operational stability. More specifically, the bearing assembly 10 in the rotor assembly 100 has a larger oil reservoir 110, which increases the grease storage capacity and provides more lubrication to the rolling elements, thereby extending the service life of the outer rotor blower 1000.

[0048] Furthermore, the outer rotor fan 1000 may also include a retaining spring 900, which can be used to axially limit the rotor assembly 100. Specifically, the outer circumferential surface of the rotating shaft 12 is provided with a positioning groove 106, and the retaining spring 900 is sleeved on the outer circumference of the rotating shaft 12. The rotating shaft 12 includes a first section, a second section, and a transition section. The first section and the second section are connected to opposite sides of the transition section along the axial direction of the rotating shaft 12. The outer circumferential surface of the second section of the rotating shaft 12 is provided with a positioning groove 106. The diameter of the first section is smaller than the diameter of the second section, and the transition section gradually expands outward from the first section to the second section. A portion of the retaining spring 900 extends into the positioning groove 106 to achieve axial engagement with the rotating shaft 12, thereby enhancing the fixing and support of the rotating shaft 12.

[0049] Combine Figure 4 In some embodiments of the present invention, the outer rotor fan 1000 further includes an electrical control box 600, an air inlet ring 700, and a base plate 800. The electrical control box 600 is fixed to the bearing seat 210, the housing 300 connects the base plate 800 and the stator assembly 200, and the air inlet ring 700 can be fastened to the base plate 800 by screws.

[0050] It should be noted that the axial direction can refer to Figure 1 The up and down directions in the radial direction can refer to Figure 1 Left and right direction in .

[0051] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0053] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature. Throughout this specification, references to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" indicate that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate different embodiments or examples, and features from different embodiments or examples, as long as they do not conflict with each other. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An external rotor fan, characterized in that: include: chassis, The cam is secured to the outer wall of the housing and is adapted to engage the drive shaft of the drive member and to engage the drive member with a force which is adapted to engage the drive member and to engage the drive member with a force which is adapted to engage the drive member. A stator assembly, the stator assembly being disposed inside the housing and comprising a bearing seat, the rotating shaft passing through the bearing seat; a wave washer supported between the bearing assembly and the bearing seat; a fan blade, wherein the fan blade is fixedly connected to the rotor assembly; A retaining spring is sleeved on the outer circumference of the rotating shaft, and the rotating shaft includes a first section, a second section and a transition section. The first section and the second section are connected to opposite sides of the transition section along the axial direction of the rotating shaft. A positioning groove is provided on the outer circumference of the second section of the rotating shaft. The diameter of the first section is smaller than the diameter of the second section. The transition section gradually expands outward from the first section to the second section, and a part of the retaining spring extends into the positioning groove.

2. The outer rotor fan according to claim 1, characterized in that: The inner circumference of the sleeve is provided with a first groove portion surrounding the rotating shaft, the outer circumference of the rotating shaft is provided with a second groove portion corresponding to the first groove portion, the first part of the rolling element is provided in the first groove portion, and the second part is provided in the second groove portion.

3. The outer rotor fan according to claim 1, characterized in that: The bearing assembly further comprises: A retaining frame is arranged in a gap between the sleeve and the rotating shaft and supported on the outer periphery of the rolling element.

4. The outer rotor fan according to claim 1, characterized in that: The plurality of rolling elements include a plurality of first rolling bodies and a plurality of second rolling bodies, and the plurality of first rolling bodies and the plurality of second rolling bodies are arranged at intervals along an extending direction of the rotation shaft.

5. The outer rotor fan according to claim 4, characterized in that: The sleeve has a first end and a second end opposite to each other. The first rolling elements are closer to the first end of the rotating shaft than the second rolling elements. The second rolling elements are closer to the second end of the rotating shaft than the first rolling elements.

6. The outer rotor fan according to claim 5, characterized in that: Also includes: a first dust cover and a second dust cover, wherein the first dust cover covers the rotating shaft and the first end of the sleeve, and the second dust cover covers the rotating shaft and the second end of the sleeve; and / or A first retaining frame and a second retaining frame, the first retaining frame is arranged in the gap between the sleeve and the rotating shaft and is supported on the outer periphery of the plurality of first rolling bodies, and the second retaining frame is arranged in the gap between the sleeve and the rotating shaft and is supported on the outer periphery of the plurality of second rolling bodies.

7. The outer rotor fan according to claim 4, characterized in that: The inner circumference of the sleeve is provided with a first annular groove surrounding the rotating shaft, the outer circumference of the rotating shaft is provided with a second annular groove corresponding to the first annular groove, a first portion of the plurality of first rolling elements is provided in the first annular groove, and a second portion is provided in the second annular groove; and / or The inner circumference of the sleeve is provided with a third annular groove surrounding the rotating shaft, the outer circumference of the rotating shaft is provided with a fourth annular groove corresponding to the third annular groove, the first part of the plurality of second rolling bodies is provided in the third annular groove, and the second part is provided in the fourth annular groove.

8. The outer rotor fan according to claim 1, characterized in that: Also includes: Bracket, A plurality of permanent magnets are arranged on the bracket at intervals along the circumference of the bracket, and outer walls of the permanent magnets are in contact with the inner wall of the shell.

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