Fan assembly, outdoor unit and air conditioner

Abstract

The fan assembly comprises a motor, a limiting part, a wind wheel and a fastener, the motor comprises a shell, a rotor and a rotating shaft, the rotor is rotationally arranged in the shell, and the rotating shaft is fixedly connected with the rotor and penetrates out of the shell; the limiting part is arranged on the shaft section of the rotating shaft penetrating out of the shell; the wind wheel comprises a hub and a first shaft sleeve part, the hub is provided with an installation hole and installed on the shaft section, penetrating out of the shell, of the rotating shaft through the installation hole, the first shaft sleeve part is located on the side, facing the rotor, of the hub and protrudes towards the rotor, and the first shaft sleeve part is arranged on the rotating shaft in a sleeving mode and abuts against the limiting part; the fastener is fixedly installed on the rotating shaft so that the wind wheel can be clamped between the limiting part and the fastener. According to the fan assembly, the fixed frequency can be improved, the rotor and the wind wheel can resonate only when the rotating speed is high, and therefore the abnormal resonance sound generated when the fan assembly operates at the low rotating speed is effectively reduced, and noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a fan assembly, an outdoor unit and an air conditioner. Background Art

[0002] During the operation of the fan of the air conditioner outdoor unit, resonance will occur between the wind wheel and the rotor in the speed range of 500rpm to 600rpm, resulting in abnormal noise and loud noise. In the related art, the fixed frequency is reduced by setting a vibration reduction groove on the rotating shaft, so that the wind wheel and the rotor will resonate only when the speed is lower than the speed of the fan during normal operation, thereby reducing the noise during normal operation of the fan. However, with the development of air conditioning, the fan of the outdoor unit is developing in the direction of low speed and large air volume, and the minimum speed of the fan during normal operation is getting lower and lower. The use of existing fan solutions will cause resonance and abnormal noise, and cannot solve the noise problem during normal operation of the fan. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a fan assembly that can increase the fixed frequency so that the rotor and the wind wheel will resonate only when the speed is high, thereby effectively reducing the resonance noise when the fan assembly runs at a low speed and reducing noise.

[0004] The utility model also provides an outdoor unit with the fan assembly.

[0005] According to the first aspect of the present invention, the fan assembly includes a motor, including a shell, a rotor and a rotating shaft, the rotor is rotatably arranged in the shell, the rotating shaft is fixedly connected to the rotor and passes through the shell; a limiting portion is arranged on the shaft section of the rotating shaft passing through the shell; a wind wheel includes a hub and a first shaft sleeve portion, the hub is provided with a mounting hole and is mounted on the shaft section of the rotating shaft passing through the shell through the mounting hole, the first shaft sleeve portion is located on the side of the hub facing the rotor and protrudes toward the rotor, the first shaft sleeve portion is sleeved on the rotating shaft and abuts against the limiting portion; a fastener is fixedly installed on the rotating shaft so that the wind wheel is clamped between the limiting portion and the fastener.

[0006] The fan assembly according to the first embodiment of the utility model has at least the following beneficial effects: by providing a first sleeve portion protruding toward the rotor on the wind wheel, and making the first sleeve portion contact the limit portion, the point of action for transmitting torque to the wind wheel is closer to the rotor, so as to shorten the minimum action distance for transmitting torque between the rotor and the wind wheel, effectively improve the torsional rigidity and increase the fixed frequency. Therefore, the rotor and the wind wheel of the fan assembly of this embodiment will resonate only when the speed is high, effectively reducing the resonance noise when the fan assembly is running at a low speed, and achieving noise reduction.

[0007] According to some embodiments of the utility model, the limiting portion is a retaining spring, the rotating shaft is provided with a retaining groove, and the retaining spring is retained in the retaining groove.

[0008] According to some embodiments of the present utility model, the rotor includes a second sleeve portion, which is protruding toward the wind wheel along the direction of the central axis of the rotating shaft, and the second sleeve portion is sleeved on the rotating shaft and fixedly connected to the rotating shaft.

[0009] According to some embodiments of the present invention, along the direction of the central axis, a minimum distance between the first sleeve portion and the second sleeve portion is L, which satisfies: 8mm≤L≤25mm.

[0010] According to some embodiments of the utility model, the fan assembly also includes a first bearing, which is installed on the housing and located between the rotor and the wind wheel, the rotating shaft passes through the first bearing, and the first bearing abuts against the second sleeve portion.

[0011] According to some embodiments of the utility model, the fan assembly further includes a waterproof cover, which is located between the first bearing and the wind wheel and fixedly mounted on the rotating shaft, and the limiting portion is located on a side of the waterproof cover away from the first bearing.

[0012] According to some embodiments of the utility model, the shaft section of the rotating shaft passing through the shell is provided with a shoulder, the shoulder is located in the mounting hole, the inner wall of the mounting hole is provided with a groove, and the shoulder and the groove are spaced apart from two relative wall surfaces along the direction of the central axis of the rotating shaft.

[0013] According to some embodiments of the present invention, the minimum inner diameter of the first shaft sleeve portion is greater than the maximum outer diameter of the shaft segment of the rotating shaft passing through the first shaft sleeve portion.

[0014] The outdoor unit according to the second embodiment of the utility model comprises a housing and a fan assembly according to the first embodiment of the utility model, wherein the fan assembly is arranged in the housing.

[0015] According to the outdoor unit of the second embodiment of the utility model, at least the following beneficial effects are achieved: the outdoor unit adopts the above-mentioned fan assembly, by providing a first sleeve portion protruding toward the rotor on the wind wheel, and making the first sleeve portion contact the limit portion, so that the point of action for transmitting torque to the wind wheel is closer to the rotor, so as to shorten the minimum action distance for transmitting torque between the rotor and the wind wheel, effectively improve the torsional rigidity and increase the fixed frequency. Therefore, the fan assembly of this embodiment will resonate with the wind wheel only when the speed is high, effectively reducing the resonance noise when the fan assembly is running at a low speed, and achieving noise reduction.

[0016] An air conditioner according to an embodiment of the third aspect of the utility model includes an outdoor unit according to an embodiment of the second aspect of the utility model.

[0017] The air conditioner according to the third embodiment of the utility model has at least the following beneficial effects: the air conditioner adopts the above-mentioned outdoor unit, by setting a first sleeve portion protruding toward the rotor on the wind wheel, and making the first sleeve portion contact the limit portion, so that the point of action for transmitting torque to the wind wheel is closer to the rotor, so as to shorten the minimum action distance for transmitting torque between the rotor and the wind wheel, effectively improve the torsional rigidity and increase the fixed frequency. Therefore, the rotor and the wind wheel of the fan assembly of this embodiment will resonate only when the speed is high, effectively reducing the resonance noise when the fan assembly is running at a low speed, and achieving noise reduction.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 is a partial cross-sectional view of a fan assembly in an embodiment of the utility model;

[0021] Figure 2 yes Figure 1 A in the enlarged view;

[0022] Figure 3 yes Figure 1 The enlarged view of point B in the figure;

[0023] Figure 4 It is a partial cross-sectional view of the wind wheel in the embodiment of the utility model;

[0024] Figure 5 is a cross-sectional view of a rotor in an embodiment of the utility model;

[0025] Figure 6 It is a partial cross-sectional view of the rotating shaft in the embodiment of the utility model.

[0026] Reference numerals:

[0027] Motor 100; housing 110; first bearing 111; second bearing 112; bearing seat 113; air-avoiding portion 114; rotor 120; second sleeve portion 121; second wall surface 122; rotating shaft 130; slot 131; shaft shoulder 132;

[0028] Limiting portion 200;

[0029] Wind wheel 300; mounting hole 310; first sleeve portion 320; first wall surface 330; groove 340; hub 350; blade 360;

[0030] Fastener 400;

[0031] Waterproof cover 500. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships 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.

[0034] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installing, connecting, assembling, and matching should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model based on the specific content of the technical solution.

[0036] In the fan of the existing air conditioner outdoor unit, there are two excitation frequencies of the motor that drives the wind wheel, including 5 times the rotational frequency (5*n / 60) and 30 times the rotational frequency (30*n / 60), where n is the rotational speed. It is easy to understand that the excitation frequency is related to the rotational speed of the motor. The higher the rotational speed, the higher the excitation frequency. When the torsional resonance frequency between the rotor and the wind wheel is equal to the excitation frequency, it can also be understood that when the fixed frequency (i.e., the natural frequency) of the fan during operation is equal to the excitation frequency, the rotor and the wind wheel will resonate and produce abnormal resonance sound, which is relatively noisy.

[0037] In the related art, the fixed frequency is reduced by setting a damping groove on the rotating shaft so that the speed when resonance occurs is lower than the normal operating speed, thereby reducing the noise of the fan during normal operation. However, as the minimum speed of the fan during normal operation becomes lower and lower, the existing solution can no longer meet the noise requirements of the fan during normal operation.

[0038] For this purpose, refer to Figures 1 to 6 As shown, the first embodiment of the utility model provides a fan assembly, which is applied to the outdoor unit of the air conditioner to enhance the heat dissipation of the heat exchanger of the outdoor unit. The air conditioner here can be a central air conditioner, a cabinet air conditioner, a wall-mounted air conditioner, etc.

[0039] Reference Figure 1 As shown, it can be understood that the fan assembly includes a motor 100 and a wind wheel 300. Specifically, the motor 100 includes a housing 110, a rotor 120 and a rotating shaft 130. The housing 110 is a plastic part and has an inner cavity. A stator is embedded in the housing 110, and the stator is arranged around the outer periphery of the inner cavity, that is, the stator is sealed in the housing 110. The rotor 120 is rotatably mounted in the inner cavity of the housing 110 and cooperates with the stator, so that the rotor 120 can be driven to rotate. The rotating shaft 130 is penetrated in the rotor 120 and fixedly connected to the rotor 120, and the two ends of the rotating shaft 130 are respectively penetrated from the two axial end faces of the rotor 120. The housing 110 is also equipped with two bearings, which are respectively mounted on the housing 110 through the bearing seats 113, and the two bearings are respectively located on both sides of the axial direction of the rotor 120, and the two ends of the rotating shaft 130 are respectively penetrated in the two bearings and fixedly connected to the inner rings of the bearings, so as to realize the rotational cooperation between the combination of the rotor 120 and the rotating shaft 130 and the housing 110. At the same time, one end of the rotating shaft 130 also passes through the housing 110, so that the wind wheel 300 is installed on the shaft section of the rotating shaft 130 passing through the housing 110, thereby driving the wind wheel 300 to rotate. The two bearings are defined as the first bearing 111, and the other bearing is the second bearing 112, that is, the first bearing 111 is closer to the wind wheel 300 than the second bearing 112.

[0040] Reference Figure 1 and Figure 4 As shown, it can be understood that the wind wheel 300 includes a hub 350 and a plurality of blades 360, the plurality of blades 360 are connected to the outer peripheral wall of the hub 350 and are arranged at equal intervals along the circumference of the hub 350, the hub 350 is provided with a mounting hole 310, the central axis of the mounting hole 310 coincides with the rotation axis of the wind wheel 300, and the mounting hole 310 passes through two axial end surfaces of the hub 350. The wind wheel 300 is sleeved on the shaft section of the rotating shaft 130 passing through the housing 110 through the mounting hole 310.

[0041] Reference Figure 2 and Figure 4As shown, it can be understood that the wind wheel 300 further includes a first sleeve portion 320, and the first sleeve portion 320 is located on the side of the hub 350 facing the rotor 120. Specifically, the first sleeve portion 320 is a sleeve structure, the first sleeve portion 320 is integrally formed with the hub 350, and the internal space of the first sleeve portion 320 is connected to the mounting hole 310, the first sleeve portion 320 is protruded toward the rotor 120 along the direction of the central axis (i.e., the rotation axis) of the rotating shaft 130, and the first sleeve portion 320 is sleeved on the outer periphery of the rotating shaft 130.

[0042] Reference Figure 2 As shown, it can be understood that a limit portion 200 is also provided on the rotating shaft 130, and the limit portion 200 is located between the rotor 120 and the wind wheel 300. The limit portion 200 can be a shoulder structure that is an integral structure with the rotating shaft 130 or a retaining spring installed on the rotating shaft 130. The limit portion 200 is located at the shaft section of the rotating shaft 130 that passes through the shell 110, and the limit portion 200 is located between the rotor 120 and the wind wheel 300.

[0043] Reference Figure 1 and Figure 2 As shown, it can be understood that the shaft section of the rotating shaft 130 passing through the housing 110 is also fixedly installed with a fastener 400, which can be a nut or a screw, etc. The fastener 400 is located on the side of the wind wheel 300 away from the rotor 120. In this embodiment, the fastener 400 is configured as a nut, and the end of the shaft section of the rotating shaft 130 passing through the housing 110 is provided with a thread matching the nut. The first sleeve portion 320 abuts against the limiting portion 200, and the fastener 400 is screwed to the rotating shaft 130 and abuts against the side wall of the wind wheel 300 away from the rotor 120. It is easy to understand that after the fastener 400 is tightened, the first sleeve portion 320 is pressed against the limiting portion 200, and the fastener 400 is pressed against the wind wheel 300, so that the wind wheel 300 is sandwiched between the limiting portion 200 and the fastener 400. When the rotor 120 and the rotating shaft 130 rotate, the wind wheel 300 is driven to rotate by the friction force generated by the first sleeve portion 320 and the limiting portion 200 being pressed together and the friction force generated by the fastener 400 and the wind wheel 300 being pressed together.

[0044] Of course, in other embodiments, the fastener 400 may also be a screw. In this case, the shaft 130 is provided with a screw hole arranged along the axial direction. The screw is tightened on the shaft 130 and can contact the side wall of the wind wheel 300 away from the rotor 120.

[0045] Reference Figure 3 , Figure 4 and Figure 6As shown, it can be understood that, generally speaking, the shaft section of the rotating shaft 130 passing through the housing 110 is also provided with a shaft shoulder 132. When the wind wheel 300 is installed on the rotating shaft 130, the shaft shoulder 132 is located in the mounting hole 310. The inner wall of the mounting hole 310 is provided with a groove 340. Along the direction of the central axis of the rotating shaft 130, the shaft shoulder 132 and the two opposite walls of the groove 340 are arranged at intervals, that is, there is a gap between the shaft shoulder 132 and the two opposite walls of the groove 340, and they are not in contact. The rotating shaft 130 will not transmit torque to the wind wheel 300 at the position of the shaft shoulder 132 and the groove 340, so that the action point of the torque transmitted between the rotating shaft 130 and the wind wheel 300 can be ensured to be the position where the first sleeve part 320 conflicts with the limiting part 200. In other words, the point of action for transmitting torque between the rotating shaft 130 and the wind wheel 300 is transferred from the position of the shaft shoulder 132 and the groove 340 to the position where the first sleeve portion 320 and the limiting portion 200 are in conflict, thereby shortening the axial distance between the point of action for transmitting torque between the rotating shaft 130 and the wind wheel 300 and the rotor 120.

[0046] Therefore, by providing the first sleeve portion 320 protruding toward the rotor 120 on the wind wheel 300, and making the first sleeve portion 320 abut against the limit portion 200, the point of action at which the rotating shaft 130 transmits torque to the wind wheel 300 and is closest to the rotor 120 is transferred from the position in the mounting hole 310 to the side of the wind wheel 300 facing the rotor 120 and closer to the rotor 120, thereby shortening the minimum action distance for transmitting torque between the rotor 120 and the wind wheel 300, effectively improving the torsional rigidity and increasing the torsional resonance frequency and the fixed frequency. Therefore, the excitation frequency of the rotor 120 of the fan assembly of this embodiment will be equal to the fixed frequency only when the speed is high, that is, the rotor 120 and the wind wheel 300 will resonate only when the speed is high, effectively reducing the resonance noise when the fan assembly is running at a low speed, and reducing noise to adapt to the scenario where the minimum speed of the fan assembly is getting lower and lower during normal operation. It is easy to understand that the minimum acting distance for transmitting torque between the rotor 120 and the wind wheel 300 is the minimum distance between the second sleeve portion 121 and the rotor 120 in the direction of the central axis of the rotating shaft 130 .

[0047] It can be understood that in this embodiment, the shock-absorbing groove provided on the rotating shaft 130 is also cancelled, so that the torsional rigidity, torsional resonance frequency and fixed frequency are further improved, and the torsional rigidity, torsional resonance frequency and fixed frequency are increased from the original 243Hz to 419Hz, which effectively reduces the resonance and abnormal sound of the fan component when running at low speed, thereby reducing noise.

[0048] Reference Figure 2 and Figure 6As shown, it can be understood that in this embodiment, the limiting part 200 is configured as a retaining spring, and correspondingly, the outer peripheral wall of the rotating shaft 130 is provided with a retaining groove 131, so that the retaining spring is retained in the retaining groove 131, so that the retaining spring and the rotating shaft 130 can be relatively fixed, so as to provide axial positioning for the wind wheel 300 and transmit the torque of the rotating shaft 130 to the wind wheel 300. Compared with the limiting part 200 being configured as a shoulder structure, when the limiting part 200 is configured as a retaining spring, the structure of the corresponding rotating shaft 130 is simpler, and it is only necessary to further process the retaining groove 131 on the outer peripheral wall of the rotating shaft 130, which is convenient for manufacturing, and there is no need to use a rotating shaft 130 with a larger outer diameter to turn the shoulder structure, which is conducive to reducing manufacturing costs. At the same time, the assembly process of the retaining spring is also simple, which is conducive to improving manufacturing efficiency.

[0049] Reference Figure 2 As shown, it can be understood that the minimum inner diameter of the first sleeve portion 320 is greater than the maximum outer diameter of the shaft section of the rotating shaft 130 that passes through the first sleeve portion 320, that is, the inner circumferential wall of the first sleeve portion 320 is spaced from the outer circumferential wall of the rotating shaft 130. Therefore, when the wind wheel 300 is installed on the rotating shaft 130, the axial friction between the first sleeve portion 320 and the rotating shaft 130 can be reduced, which is convenient for installation, and is conducive to reducing the difficulty of installation and improving the installation efficiency.

[0050] Reference Figure 1 , Figure 2 and Figure 5 As shown, it can be understood that, in order to further shorten the minimum action distance of torque transmission between the rotor 120 and the wind wheel 300, the rotor 120 includes a second sleeve portion 121, and the second sleeve portion 121 is located on the side of the rotor 120 facing the wind wheel 300. Similarly, the second sleeve portion 121 is also a sleeve structure, and the second sleeve portion 121 is integrally formed with the rotor 120, and the second sleeve portion 121 is protruded toward the wind wheel 300 along the direction of the central axis of the rotating shaft 130. The rotating shaft 130 is arranged in the inner space of the second sleeve portion 121, and the second sleeve portion 121 is fixedly connected to the rotating shaft 130. Therefore, torque can also be transmitted between the second sleeve portion 121 and the rotating shaft 130. Therefore, the action point where the rotor 120 and the rotating shaft 130 transmit torque and is closest to the wind wheel 300 is closer to the wind wheel 300. At this time, the minimum action distance for transmitting torque between the rotor 120 and the wind wheel 300 is the minimum distance between the second sleeve portion 121 and the first sleeve portion 320 in the direction of the central axis of the rotating shaft 130. By providing the second sleeve portion 121, the minimum action distance for transmitting torque between the rotor 120 and the wind wheel 300 can be further shortened, the torsional rigidity can be improved, and the torsional resonance frequency and the fixed frequency can be increased, so that the rotor 120 and the wind wheel 300 will resonate only when the speed is higher. Therefore, the resonance noise when the fan assembly is running at a low speed can be reduced, and the noise can be reduced.

[0051] Reference Figure 2 As shown, it can be understood that the first bearing 111 is located between the rotor 120 and the wind wheel 300, and the inner ring of the first bearing 111 contacts the second sleeve portion 121 toward the wall of the rotor 120, so that the first bearing 111 can be directly axially positioned by the second sleeve portion 121, and a limiting member (such as a retaining spring) used for axially positioning the first bearing 111 can be eliminated, and there is no need to further process the rotating shaft 130 to adapt to the installation of the limiting member, thereby improving manufacturability and helping to reduce manufacturing costs.

[0052] Reference Figure 2 As shown, it can be understood that the fan assembly further includes a waterproof cover 500. Specifically, the waterproof cover 500 is a cover structure and is fixedly installed on the rotating shaft 130. The waterproof cover 500 is located between the first bearing 111 and the wind wheel 300, that is, the waterproof cover 500 is located between the first bearing 111 and the first sleeve portion 320, and the opening of the waterproof cover 500 faces the first bearing 111. The housing 110 is provided with a void avoidance portion 114 on the side facing the wind wheel 300. The waterproof cover 500 is partially located in the void avoidance portion 114, and the waterproof cover 500 is covered on the outer periphery of the first bearing 111. Therefore, when the rotating shaft 130 rotates, the waterproof cover 500 rotates with the rotating shaft 130, and the waterproof cover 500 always remains covered on the outer periphery of the first bearing 111, thereby preventing water from entering the interior of the housing 110 from the gap between the first bearing 111 and the bearing seat 113, and effectively improving the waterproof performance of the motor 100.

[0053] Reference Figure 2 As shown, it can be understood that the limiting portion 200 is located on the side of the waterproof cover 500 away from the first bearing 111, that is, the retaining spring used to position the wind wheel 300 is located on the side of the waterproof cover 500 away from the first bearing 111. At this time, the retaining spring will not affect the original installation position of the waterproof cover 500, and there is no need to adjust the structure between the first bearing 111 and the waterproof cover 500, thereby minimizing the manufacturing cost. During assembly, the waterproof cover 500 can be first mounted on the rotating shaft 130, and the retaining spring can be clamped in the clamping groove 131 of the rotating shaft 130, and then the wind wheel 300 can be mounted on the rotating shaft 130 and the first sleeve portion 320 can be abutted against the retaining spring, and finally the fastener 400 can be tightened on the rotating shaft 130.

[0054] Reference Figure 2 , Figure 4 and Figure 5As shown, it can be understood that, along the direction of the central axis of the rotating shaft 130, the minimum distance between the first sleeve portion 320 and the second sleeve portion 121 is L. The wall surface of the first sleeve portion 320 facing the second sleeve portion 121 is defined as the first wall surface 330, and the wall surface of the second sleeve portion 121 facing the first sleeve portion 320 is defined as the second wall surface 122. The minimum distance between the first wall surface 330 and the second wall surface 122 in the direction of the central axis of the rotating shaft 130 is L. When measuring, the position where the distance between the first wall surface 330 and the second wall surface 122 is the smallest can be measured by using a vernier caliper. The minimum distance L between the first sleeve portion 320 and the second sleeve portion 121 satisfies: 8mm≤L≤25mm. It is easy to understand that the first bearing 111, the bearing seat 113 corresponding to the first bearing 111, the waterproof cover 500, the stopper and other components need to be installed between the first sleeve part 320 and the second sleeve part 121, and the distance between the bearing seat 113 corresponding to the first bearing 111, the waterproof cover 500, and the stopper in the direction of the central axis of the rotating shaft 130 needs to be ensured to avoid interference or wear. Therefore, the minimum distance L between the first sleeve part 320 and the second sleeve part 121 is ≥ 8mm, which is conducive to ensuring that there is enough space between the first sleeve part 320 and the second sleeve part 121. The first bearing 111, the bearing seat 113 corresponding to the first bearing 111, the waterproof cover 500, the limiter and other components are installed in the space and ensure that there is enough clearance between the parts; the minimum distance L between the first sleeve part 320 and the second sleeve part 121 is ≤ 25 mm, which can avoid the distance between the first sleeve part 320 and the second sleeve part 121 being too large, resulting in the minimum effective distance for transmitting torque between the rotor 120 and the wind wheel 300 being too large, thereby effectively improving the torsional rigidity and increasing the torsional resonance frequency and fixed frequency, thereby reducing the resonance and abnormal sound of the fan component when running at low speed and reducing noise. Therefore, 8mm≤L≤25mm, for example, L=8mm, L=10mm, L=15mm, L=20mm or L=25mm, etc., on the premise of installing the first bearing 111, the bearing seat 113 corresponding to the first bearing 111, the waterproof cover 500, the limiter and other components and ensuring that there is enough clearance between the parts, the minimum effective distance for transmitting torque between the rotor 120 and the wind wheel 300 is minimized, thereby maximizing the torsional rigidity, torsional resonance frequency and fixed frequency, thereby reducing the resonance and abnormal sound of the fan assembly when running at low speed and reducing noise.

[0055] Reference Figure 2 As shown, it can be understood that, in this embodiment, the minimum distance L between the first sleeve portion 320 and the second sleeve portion 121 is 21 mm, so that the minimum effective distance for transmitting torque between the rotor 120 and the wind wheel 300 is shortened from the original 75.5 mm to 21 mm, which greatly improves the torsional rigidity and increases the torsional resonance frequency and fixed frequency, effectively reducing the resonance noise of the fan component when running at low speed, thereby reducing noise.

[0056] The outdoor unit of the second embodiment of the utility model comprises a housing and a fan assembly of the first embodiment of the utility model, and the fan assembly is arranged in the housing. For example, a bracket is installed in the housing, and the motor 100 of the fan assembly is fixedly installed on the bracket, so that the fan assembly is fixed to the housing to enhance the heat dissipation of the heat exchanger in the outdoor unit. The outdoor unit here can be an outdoor unit of an air conditioner such as a central air conditioner, a cabinet air conditioner, a wall-mounted air conditioner, etc.

[0057] Since the outdoor unit adopts all the technical solutions of the fan assembly of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0058] The air conditioner of the third embodiment of the utility model includes the outdoor unit of the second embodiment of the utility model. The air conditioner here can be a central air conditioner, a cabinet air conditioner, a wall-mounted air conditioner, etc.

[0059] Since the air conditioner adopts all the technical solutions of the outdoor unit of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0060] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A fan assembly, characterized in that: include: The motor comprises a housing, a rotor and a rotating shaft, wherein the rotor is rotatably arranged in the housing, and the rotating shaft is fixedly connected to the rotor and passes through the housing; A limiting portion, provided on the shaft section of the rotating shaft passing through the housing; The wind wheel comprises a hub and a first sleeve portion, wherein the hub is provided with a mounting hole and is mounted on the shaft section of the rotating shaft passing through the housing through the mounting hole, the first sleeve portion is located on a side of the hub facing the rotor and protrudes toward the rotor, and the first sleeve portion is sleeved on the rotating shaft and abuts against the limiting portion; A fastener is fixedly mounted on the rotating shaft so that the wind wheel is clamped between the limiting portion and the fastener.

2. The fan assembly according to claim 1, characterized in that: The limiting portion is a clamping spring, the rotating shaft is provided with a clamping groove, and the clamping spring is clamped in the clamping groove.

3. The fan assembly according to claim 1 or 2, characterized in that: The rotor comprises a second sleeve portion, the second sleeve portion is protruding toward the wind wheel along the direction of the central axis of the rotating shaft, and the second sleeve portion is sleeved on the rotating shaft and fixedly connected to the rotating shaft.

4. The fan assembly according to claim 3, characterized in that: Along the direction of the central axis, a minimum distance between the first sleeve portion and the second sleeve portion is L, which satisfies: 8mm≤L≤25mm.

5. The fan assembly according to claim 3, characterized in that: The fan assembly further includes a first bearing, which is mounted on the housing and located between the rotor and the wind wheel. The rotating shaft passes through the first bearing, and the first bearing abuts against the second shaft sleeve.

6. The fan assembly according to claim 5, characterized in that: The fan assembly further includes a waterproof cover, which is located between the first bearing and the wind wheel and fixedly mounted on the rotating shaft, and the limiting portion is located on a side of the waterproof cover away from the first bearing.

7. The fan assembly according to claim 1 or 2, characterized in that: The shaft section of the rotating shaft passing through the shell is provided with a shaft shoulder, the shaft shoulder is located in the mounting hole, the inner wall of the mounting hole is provided with a groove, and the shaft shoulder and the groove are spaced apart from two opposite wall surfaces along the direction of the central axis of the rotating shaft.

8. The fan assembly according to claim 1 or 2, characterized in that: The minimum inner diameter of the first shaft sleeve portion is greater than the maximum outer diameter of the shaft section of the rotating shaft passing through the first shaft sleeve portion.

9. An outdoor unit, characterized in that: The invention comprises a housing and a fan assembly according to any one of claims 1 to 8, wherein the fan assembly is arranged in the housing.

10. An air conditioner, characterized in that Includes the outdoor unit as claimed in claim 9.

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