Fan

Abstract

The utility model relates to a fan which comprises a hollow inner frame body, a front end cover and a rear end cover are arranged at the two ends of the inner frame body, and a front bearing chamber and a rear bearing chamber are coaxially arranged on the front end cover and the rear end cover. The stator assembly is arranged in the inner frame body and is fixedly mounted with the inner frame body; the rotor assembly is rotationally arranged on the inner side of the stator assembly and comprises a rotating shaft with the two ends sleeved with a first bearing and a second bearing, the first bearing is in clearance fit with the front bearing chamber, the second bearing is in clearance fit with the rear bearing chamber, and an elastic piece is arranged between the corresponding bearing chamber and bearing. The fan blade assembly is located on one side of the inner frame body and arranged on the rotating shaft in a sleeving mode, the radial installation space of the coil or the permanent magnet can be increased, the larger number of coil windings or the larger size of the permanent magnet can be obtained, the installation precision of the rotating shaft can be guaranteed, the fan blade assembly is more suitable for installation of a fan with the small radial size, and the performance of the small-size fan can be improved.

Description

Technical Field

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

[0002] Current fans primarily consist of a stator assembly and a rotor assembly. The stator's primary function is to generate a rotating magnetic field or induce current, while the rotor assembly's function is to be cut by magnetic lines of force in the rotating magnetic field, generating current or inducing electromotive force to rotate the fan blades and generate airflow. Existing fans typically feature a central tube, with the rotor assembly's rotating shaft rotatably mounted within the central tube, which is then fixed to the stator base. However, this arrangement occupies radial space within the fan, further compressing the radial installation space for coils or permanent magnets. This significantly limits the number of coil turns or the size of the permanent magnets, and an overly compact structure can reduce fan performance. Consequently, existing installation methods are less suitable for fans with smaller radial dimensions. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a fan, which eliminates the middle tube parts, fixes the rotor assembly on the rotating shaft, and fixes the stator assembly on the fan frame assembly. Bearing chambers are set on the front end cover and the rear end cover of the inner frame as the installation and support points of the rotating shaft, and elastic parts are used to ensure that the bearings at both ends of the rotating shaft can be coaxial. This can increase the radial installation space of the coil or permanent magnet, obtain a larger number of coil windings or permanent magnet size, and ensure the installation accuracy of the rotating shaft. It is more suitable for the installation of fans with smaller radial dimensions and can improve the performance of small-sized fans.

[0004] The utility model provides a fan to solve the above technical problems, comprising:

[0005] The fan frame assembly includes a hollow inner frame body, a front end cover and a rear end cover are provided at both ends of the inner frame body, and a front bearing chamber and a rear bearing chamber are coaxially provided on the front end cover and the rear end cover;

[0006] A stator assembly is disposed in the inner frame and fixedly mounted to the inner frame;

[0007] a rotor assembly rotatably disposed inside the stator assembly, comprising a rotating shaft with a first bearing and a second bearing sleeved at both ends, the first bearing being loosely fitted in the front bearing chamber, the second bearing being loosely fitted in the rear bearing chamber, and an elastic member being provided between the corresponding bearing chambers and the bearings;

[0008] The fan blade assembly is located on one side of the inner frame and is sleeved on the rotating shaft.

[0009] Furthermore, the inner wall of the bearing chamber is provided with at least one ring groove, and the elastic member is partially located in the ring groove and abuts against the outer ring of the bearing.

[0010] Further, the elastic member is an O-ring seal.

[0011] Further, at one end of the front bearing chamber and the rear bearing chamber away from each other, there are provided limiting mounting grooves. At both ends of the rotating shaft, there are provided limiting steps that abut against the opposite sides of the first bearing and the second bearing. An elastic retaining ring is provided in the limiting mounting groove. A washer is provided between the elastic retaining ring and the bearing. A wave spring is also provided between the second bearing and the elastic retaining ring.

[0012] Further, in the centers of the front end cover and the rear end cover, there are provided mounting sleeves extending towards each other. A first steel sleeve is provided in the mounting sleeve, and a bearing chamber is formed in the first steel sleeve.

[0013] Further, the fan blade assembly includes a fixed seat and fan blades provided on the fixed seat. The fixed seat is provided with a concave portion. A dust cover is provided on the opening side of the concave portion. A mounting seat is provided at the center of the concave portion, and the mounting seat is fixedly connected to the rotating shaft.

[0014] Further, a mounting hole for the rotating shaft to pass through is provided at the center of the mounting seat. A second steel sleeve is provided in the mounting hole. A limiting groove is provided on the inner wall of the second steel sleeve. A key groove corresponding to the limiting groove is provided on the rotating shaft. A limiting key is provided in the key groove and part of the limiting key is located in the limiting groove. A nut is provided at the end of the rotating shaft, and the nut presses against the mounting seat.

[0015] Further, a pressure sleeve movably sleeved on the rotating shaft is provided between the nut and the mounting seat. A groove for accommodating the pressure sleeve is provided on the mounting seat. A third inclined surface that slopes from the outside to the inside and towards the first bearing is provided on the upper side of the second steel sleeve. A convex ring is provided on the pressure sleeve, and a fourth inclined surface that cooperates with the third inclined surface is provided on the outer wall of the convex ring.

[0016] Further, a pressure ring movably sleeved on the rotating shaft is provided between the mounting seat and the first bearing. A first inclined surface that slopes from the inside to the outside and towards the first bearing is provided on the side of the pressure ring close to the mounting seat. A second inclined surface that cooperates with the first inclined surface is provided on the side of the second steel sleeve close to the pressure ring.

[0017] Further, the fan frame assembly further includes a housing sleeved outside the inner frame body. A wind channel is formed between the housing and the inner frame body. A guide plate integrally formed with the inner frame body is provided in the wind channel.

[0018] The beneficial effects of adopting the present utility model are as follows. The stator assembly generates a magnetic field or induced current for the operation of the fan. The rotor assembly cuts the magnetic lines of force to generate a changing magnetic flux, or the induced electromotive force drives the fan blade assembly to rotate, generating an air flow. The inner frame of the fan frame assembly is used to fixedly install the stator assembly. The front end cover and the rear end cover at both ends of the inner frame can not only seal the inner frame, but also serve as the installation and support points for the rotating shaft of the rotor assembly, eliminating the middle pipe part in the prior art to increase the number of permanent magnets or coil windings. The front bearing chamber and the rear bearing chamber are coaxially arranged on the front end cover and the rear end cover, which can ensure the coaxiality of the first bearing and the second bearing at both ends of the rotating shaft. A clearance fit is provided between the bearing and the bearing chamber, and an elastic member is arranged. The elastic member can compensate for the superimposed errors caused by machining errors, assembly errors, etc. when the bearing chamber is arranged on the end cover after canceling the middle pipe design, especially the machining error. The smaller the given tolerance of its design, the more the machining difficulty and economic cost will increase exponentially, resulting in too large a deviation of the axes of the front bearing chamber and the rear bearing chamber on the front end cover and the rear end cover after assembly. Through the arrangement of the elastic member, the axes of the first bearing and the second bearing can reach coaxiality by radially compressing the elastic member, which can ensure the coaxiality of the first bearing and the second bearing after assembly. Moreover, through the arrangement of the elastic member, the contact friction with the outer ring of the bearing can also be increased, making the outer ring of the bearing a stationary ring and not prone to relative sliding, ensuring the stable operation of the rotating shaft.

[0019] In summary, by adopting the present utility model, the middle pipe part in the prior art is eliminated, the rotor assembly is fixed on the rotating shaft, and the stator assembly is fixed on the fan frame assembly. The bearing chambers are arranged on the front end cover and the rear end cover of the inner frame as the installation and support points for the rotating shaft, and through the elastic member, it is ensured that the bearings at both ends of the rotating shaft can be coaxial. It can not only increase the radial installation space of the coil or permanent magnet, obtain a larger number of coil windings or permanent magnet sizes, but also ensure the installation accuracy of the rotating shaft, and is more suitable for the installation of fans with smaller radial dimensions, and can improve the performance of small-sized fans.

[0020] The following further illustrates the present utility model in conjunction with the drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic cross-sectional structure diagram of the present utility model;

[0022] Figure 2 is Figure 1 a detailed enlarged view of A of

[0023] Figure 3 is Figure 1 a detailed enlarged view of B of

[0024] Figure 4 is an exploded structure diagram of the present utility model;

[0025] Figure 5 This is a schematic structural diagram of the rotating shaft of the present utility model.

[0026] In the attached drawings: 100 - fan frame assembly, 110 - inner frame body, 111 - flow guide plate, 120 - front end cover, 121 - front bearing chamber, 130 - rear end cover, 131 - rear bearing chamber, 140 - first steel sleeve, 141 - circular groove, 142 - elastic member, 143 - limit mounting groove, 150 - snap ring, 160 - washer, 170 - wave spring, 180 - mounting sleeve, 190 - outer shell, 200 - stator assembly, 300 - rotor assembly, 310 - rotating shaft, 311 - limit step, 312 - keyway, 320 - first bearing, 330 - second bearing, 400 - fan blade assembly, 410 - fixing seat, 411 - concave portion, 420 - second steel sleeve, 421 - limit groove, 422 - second inclined surface, 423 - third inclined surface, 430 - limit key, 440 - mounting seat, 441 - mounting hole, 450 - pressing sleeve, 451 - convex ring, 452 - fourth inclined surface, 460 - pressing ring, 461 - first inclined surface, 470 - fan blade, 480 - dust cover, 490 - nut. Detailed implementation manners

[0027] Referring to the attached drawings, the specific implementation manners of the present utility model will be described in detail.

[0028] Referring to Figures 1 to 5 , the present utility model provides an embodiment of a fan.

[0029] It should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the attached drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0030] A fan includes a fan frame assembly 100, a stator assembly 200, a rotor assembly 300, and a fan blade assembly 400. The stator assembly 200 generates a magnetic field or induced current for the operation of the fan, and the rotor assembly 300 cuts the magnetic lines of force to generate a changing magnetic flux, or the induced electromotive force drives the fan blade assembly 400 to rotate, generating an air flow.

[0031] The fan frame assembly 100 includes an inner frame body 110 with a hollow interior. The stator assembly 200 is disposed inside the inner frame body 110 and fixedly installed with the inner frame body 110. Further, the fan frame assembly 100 further includes a housing 190 sleeved outside the inner frame body 110. A wind channel is formed between the housing 190 and the inner frame body 110. The airflow generated by the rotation of the fan blade assembly 400 is discharged through the wind channel. A flow guide plate 111 integrally formed with the inner frame body 110 is provided in the wind channel, and the flow guide plate 111 guides the airflow.

[0032] Front end covers 120 and rear end covers 130 are provided at both ends of the inner frame body 110. Front bearing chambers 121 and rear bearing chambers 131 are coaxially provided on the front end covers 120 and the rear end covers 130. The front end covers 120 and the rear end covers 130 at both ends of the inner frame body 110 can not only enclose the inner frame body 110, but also serve as the installation and support points for the rotating shaft 310 of the rotor assembly 300. The coaxial setting of the two bearing chambers can ensure the coaxiality of the first bearing 320 and the second bearing 330 at both ends of the rotating shaft 310.

[0033] The rotor assembly 300 is rotatably disposed inside the stator assembly 200 and includes a rotating shaft 310 sleeved with a first bearing 320 and a second bearing 330 at both ends. The first bearing 320 is in clearance fit with the front bearing chamber 121, and the second bearing 330 is in clearance fit with the rear bearing chamber 131. An elastic member 142 is provided between the corresponding bearing chamber and the bearing. The fan blade assembly 400 is located on one side of the inner frame body 110 and sleeved on the rotating shaft 310. With the clearance fit between the bearing and the bearing chamber and the setting of the elastic member 142, the elastic member 142 can compensate for the cumulative errors caused by machining errors, assembly errors, etc. when the bearing chamber is provided on the end cover after canceling the middle tube design, especially the machining error. The smaller the given tolerance of its design, the more the machining difficulty and economic cost will increase exponentially, resulting in too large deviation of the axes of the front bearing chamber 121 and the rear bearing chamber 131 on the front end cover 120 and the rear end cover 130 after assembly. Through the setting of the elastic member 142, the axes of the first bearing 320 and the second bearing 330 can reach coaxiality by radially compressing the elastic member 142, which can ensure the coaxiality of the first bearing 320 and the second bearing 330 after assembly. Moreover, through the setting of the elastic member 142, the contact friction with the outer ring of the bearing can also be increased, making the outer ring of the bearing a stationary ring and not prone to relative sliding, ensuring the stable operation of the rotating shaft 310.

[0034] In some embodiments, mounting sleeves 180 extending towards each other are provided at the centers of the front end cover 120 and the rear end cover 130. A first steel sleeve 140 is provided inside the mounting sleeve 180, and a bearing chamber is formed inside the first steel sleeve 140. The provision of the mounting sleeve 180 provides a mounting space for bearing installation and supports the bearing. The provision of the first steel sleeve 140 can support the rotating shaft 310 and transmit loads at the same time, increasing wear resistance.

[0035] Further, at least one circle of grooves 141 is provided on the inner side wall of the bearing chamber. Part of the elastic member 142 is located in the circle of grooves 141 and abuts against the outer ring of the bearing. In this embodiment, the circle of grooves 141 is provided on the inner side wall of the first steel sleeve 140 and there are two groups. Through the provision of the circle of grooves 141, the axial direction of the elastic member 142 can be limited. The elastic member 142 can adopt a square structure or a circular structure. In this embodiment, the elastic member 142 adopts an O-ring seal.

[0036] In some embodiments, limiting steps 311 abutting against the opposite sides of the first bearing 320 and the second bearing 330 are provided at both ends of the rotating shaft 310. During assembly, the axial positions of the first bearing 320 and the second bearing 330 are positioned and limited by the limiting steps 311 to ensure the axial position accuracy of the first bearing 320 and the second bearing 330. Limiting mounting grooves 143 are provided at the ends of the front bearing chamber 121 and the rear bearing chamber 131 that are away from each other. A snap ring 150 is provided in the limiting mounting groove 143. When the snap ring 150 is installed in the limiting mounting groove 143, part of it protrudes from the limiting mounting groove 143 and abuts against the bearing. A washer 160 is provided between the snap ring 150 and the bearing, and a wave spring 170 is further provided between the second bearing 330 and the snap ring 150. Through the provision of the wave spring 170, the self-vibration of the fan can be reduced.

[0037] In some embodiments, the fan blade assembly 400 includes a fixed seat 410 and fan blades 470 provided on the fixed seat 410. An inner concave portion 411 is provided on the fixed seat 410. A dust cover 480 is provided on the opening side of the inner concave portion 411. A mounting seat 440 is provided at the center of the inner concave portion 411, and the mounting seat 440 is fixedly connected to the rotating shaft 310. At this time, the inner concave portion 411 provides a mounting space for the rotating shaft 310 and the fan blade assembly 400, and the mounting seat 440 is used to connect to the rotating shaft 310.

[0038] Further, a mounting hole 441 for the rotation shaft 310 to pass through is provided at the center of the mounting base 440. A second steel sleeve 420 is provided in the mounting hole 441. A limiting groove 421 is provided on the inner wall of the second steel sleeve 420. A key groove 312 corresponding to the limiting groove 421 is provided on the rotation shaft 310. A limiting key 430 is provided in the key groove 312 and part of the limiting key 430 is located in the limiting groove 421. At this time, by partially arranging the limiting key 430 in the limiting groove 421 and the key groove 312, circumferential limitation is performed between the rotation shaft 310 and the second steel sleeve 420, and further, when the rotation shaft 310 rotates, the fan blade assembly 400 is driven to rotate.

[0039] Further, a nut 490 is provided at the end of the rotation shaft 310. Further, a threaded section for cooperating with the nut 490 is provided at the end of the rotation shaft 310. The nut 490 is pressed against the mounting base 440. By providing the nut 490, axial limitation can be performed on the mounting base 440 and the rotation shaft 310, so that the fan blade assembly 400 can be stably mounted on the rotation shaft 310. A pressure sleeve 450 that is movably sleeved on the rotation shaft 310 is provided between the nut 490 and the mounting base 440. A groove for accommodating the pressure sleeve 450 is provided on the mounting base 440. A third inclined surface 423 that inclines from the outside to the inside and towards the first bearing 320 is provided on the upper side of the second steel sleeve 420. A convex ring 451 is provided on the pressure sleeve 450. A fourth inclined surface 452 that cooperates with the third inclined surface 423 is provided on the outer wall of the convex ring 451. When the nut 490 squeezes the pressure sleeve 450, the pressure sleeve 450 moves axially along the rotation shaft 310. The fourth inclined surface 452 on the convex ring 451 squeezes the third inclined surface 423. The outside of the convex ring 451 abuts tightly against the second steel sleeve 420, and the inside of the convex ring 451 abuts tightly against the rotation shaft 310, generating a huge static friction force and thus being able to transmit the torque when the rotation shaft 310 rotates.

[0040] Further, a pressure ring 460 that is movably sleeved on the rotation shaft 310 is provided between the mounting base 440 and the first bearing 320. A first inclined surface 461 that inclines from the inside to the outside and towards the first bearing 320 is provided on the side of the pressure ring 460 close to the mounting base 440. A second inclined surface 422 that cooperates with the first inclined surface 461 is provided on the side of the second steel sleeve 420 close to the pressure ring 460. By providing the pressure ring 460, the distance between the mounting base 440 and the first bearing 320 can be limited, and further, it is ensured that the fan blade assembly 400 can rotate. And through the cooperation of the first inclined surface 461 and the second inclined surface 422, radial movement of the fan blade 470 during rotation can be prevented, ensuring the stability of the rotation of the fan blade 470.

[0041] In summary, by adopting the present utility model, the middle pipe part in the prior art is cancelled. The rotor assembly 300 is fixed on the rotating shaft 310, and the stator assembly 200 is fixed on the fan frame assembly 100. Bearing chambers are provided on the front end cover 120 and the rear end cover 130 of the inner frame body 110 as the installation and support points of the rotating shaft 310, and the elastic member 142 is used to ensure that the bearings at both ends of the rotating shaft 310 can be coaxial. This can not only increase the radial installation space for the coil or permanent magnet, enabling a larger number of coil windings or permanent magnet sizes to be obtained, but also ensure the installation accuracy of the rotating shaft 310, making it more suitable for the installation of a fan with a smaller radial dimension and capable of improving the performance of a small-sized fan.

[0042] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. 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 present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0043] The foregoing is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent substitution on some of the technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A fan, characterized in that, Comprising: A fan frame assembly (100), including an inner frame body (110) with a hollow interior. At both ends of the inner frame body (110), there are a front end cover (120) and a rear end cover (130). Coaxially arranged on the front end cover (120) and the rear end cover (130) are a front bearing chamber (121) and a rear bearing chamber (131); A stator assembly (200), arranged inside the inner frame body (110) and fixedly installed with the inner frame body (110); A rotor assembly (300), rotatably arranged inside the stator assembly (200), including a rotating shaft (310) with a first bearing (320) and a second bearing (330) sleeved at both ends. The first bearing (320) is in clearance fit with the front bearing chamber (121), and the second bearing (330) is in clearance fit with the rear bearing chamber (131). An elastic member (142) is provided between the corresponding bearing chamber and the bearing; A fan blade assembly (400), located on one side of the inner frame body (110) and sleeved on the rotating shaft (310).

2. The blower according to claim 1, wherein At least one circle of grooves (141) is provided on the inner side wall of the bearing chamber. Part of the elastic member (142) is located in the circle of grooves (141) and abuts against the outer ring of the bearing.

3. The fan according to claim 1, wherein The elastic member (142) is an O-ring seal.

4. The blower according to claim 1, wherein At the ends of the front bearing chamber (121) and the rear bearing chamber (131) that are away from each other, there are limit mounting grooves (143). At both ends of the rotating shaft (310), there are limit steps (311) that abut against the opposite sides of the first bearing (320) and the second bearing (330). An elastic retaining ring (150) is provided in the limit mounting groove (143). A washer (160) is provided between the elastic retaining ring (150) and the bearing. A wave spring (170) is also provided between the second bearing (330) and the elastic retaining ring (150).

5. The fan according to claim 1, wherein In the center of the front end cover (120) and the rear end cover (130), there are mounting sleeves (180) extending towards each other. Inside the mounting sleeve (180), there is a first steel sleeve (140), and a bearing chamber is formed inside the first steel sleeve (140).

6. The fan according to claim 1, characterized in that, The fan blade assembly (400) includes a fixed seat (410) and fan blades (470) arranged on the fixed seat (410). An inner concave portion (411) is provided on the fixed seat (410). A dust cover (480) is provided on the opening side of the inner concave portion (411). A mounting seat (440) is provided at the center of the inner concave portion (411), and the mounting seat (440) is fixedly connected to the rotating shaft (310).

7. The blower according to claim 6, characterized in that A mounting hole (441) for the rotation shaft (310) to pass through is provided at the center of the mounting base (440). A second steel sleeve (420) is provided in the mounting hole (441). A limiting groove (421) is provided on the inner wall of the second steel sleeve (420). A key groove (312) corresponding to the limiting groove (421) is provided on the rotation shaft (310). A limiting key (430) is provided in the key groove (312), and a part of the limiting key (430) is located in the limiting groove (421). A nut (490) is provided at the end of the rotation shaft (310), and the nut (490) presses against the mounting base (440).

8. The blower according to claim 7, characterized in that A pressure sleeve (450) movably sleeved on the rotation shaft (310) is provided between the nut (490) and the mounting base (440). A third inclined surface (423) inclined from outside to inside and towards the first bearing (320) is provided on the upper side of the second steel sleeve (420). A convex ring (451) is provided on the pressure sleeve (450), and a fourth inclined surface (452) cooperating with the third inclined surface (423) is provided on the outer wall of the convex ring (451).

9. The fan according to claim 7, characterized in that A pressure ring (460) movably sleeved on the rotation shaft (310) is provided between the mounting base (440) and the first bearing (320). A first inclined surface (461) inclined from inside to outside and towards the first bearing (320) is provided on the side of the pressure ring (460) close to the mounting base (440). A second inclined surface (422) cooperating with the first inclined surface (461) is provided on the side of the second steel sleeve (420) close to the pressure ring (460).

10. The fan according to any one of claims 1-9, characterized in that, The fan frame assembly (100) further includes a housing (190) sleeved outside the inner frame body (110). An air duct is formed between the housing (190) and the inner frame body (110). A guide plate (111) integrally formed with the inner frame body (110) is provided in the air duct.

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