Anti-deflection fan

Abstract

The utility model discloses an anti-deflection fan, and aims to provide an anti-deflection fan which can effectively improve the stress uniformity of a rotor during operation and is not easy to generate axial deflection, so that the problem of unbalanced swinging in the operation process of the fan is solved, the service life of a bearing is prolonged, and abnormal sound is reduced. The device comprises a base; the outer rotor motor comprises an outer rotor and a stator, the stator is fixed on the base, blades are arranged on the outer rotor, a middle shaft is fixed on the outer rotor, the middle shaft of the outer rotor is rotationally arranged on the base through a bearing, and the outer rotor comprises a plurality of magnets which are uniformly distributed in the circumferential direction; and the attraction piece is fixed on the stator or the base, the magnets in the outer rotor and the attraction piece are distributed in the axial direction of the middle shaft, the magnets in the outer rotor are located on the same side of the attraction piece, attraction is generated between the attraction piece and the magnets in the outer rotor, and the attraction between each magnet and the attraction piece is the same.

Description

Technical Field

[0001] The utility model relates to a fan, in particular to an anti-sway fan. Background Art

[0002] With the rapid development of science and technology, the integration of electronic devices is becoming increasingly higher, the performance is constantly improving, and the heat generated is also increasing significantly. Traditional heat dissipation methods can no longer meet the heat dissipation needs of electronic equipment, so efficient and reliable heat dissipation fans are needed. One type of current heat dissipation fan uses an outer rotor motor as a power source. The outer rotor motor includes an outer rotor and a stator, wherein the stator is fixed to the base, the fan blades are arranged on the outer rotor, and the center axis of the outer rotor is rotatably arranged on the fan housing through a bearing. In the current fan of this type, when the outer rotor drives the fan blades to operate, the outer rotor is prone to axial deviation, causing the fan to swing unbalanced during operation. The axial swing of the outer rotor is prone to cause bearing wear, reducing the service life of the bearing and generating abnormal noise. Utility Model Content

[0003] The purpose of the utility model is to provide an anti-sway fan that can effectively improve the uniformity of force applied to the rotor during operation and is not prone to axial sway, thereby overcoming the problem of unbalanced swinging during fan operation, extending the service life of the bearings, and reducing abnormal noise.

[0004] The technical solution of the utility model is:

[0005] An anti-sway fan, comprising:

[0006] base;

[0007] An outer rotor motor includes an outer rotor and a stator, wherein the stator is fixed to a base, the outer rotor is provided with blades, a central shaft is fixed to the outer rotor, the central shaft of the outer rotor is rotatably arranged on the base via a bearing, and the outer rotor includes a plurality of magnets evenly distributed around the circumference;

[0008] The suction plate is fixed on the stator or the base. The magnets in the outer rotor and the suction plate are distributed axially along the central axis, and the magnets in the outer rotor are located on the same side of the suction plate. Suction is generated between the suction plate and the magnets in the outer rotor, and the suction between each magnet and the suction plate is the same. In the operation process of an anti-sway fan of this scheme, the outer rotor drives the fan blades to rotate. In the process of the outer rotor driving the fan blades to rotate, suction is generated between the suction plate and the magnets in the outer rotor, and the suction between each magnet and the suction plate is the same. In this way, the outer rotor can be evenly stressed during operation and is not prone to axial sway, thereby overcoming the problem of unbalanced swing during fan operation, extending the service life of the bearings, and reducing abnormal noise.

[0009] As an advantage, the suction sheet is fixed on an end face of the stator facing the base. In this way, in the actual manufacturing process, the suction sheet can be first installed on the stator, and then the suction sheet and the stator are installed as a whole on the base, which can facilitate the installation of the suction sheet.

[0010] Preferably, the fan further includes a circuit board, with the suction plate positioned between the stator and the circuit board. The suction plate and the circuit board are soldered to the stator core via pins. This allows the suction plate and the circuit board to be soldered to the stator core via pins, which not only facilitates installation of the suction plate and ensures stable mounting of the suction plate and the circuit board on the stator core, but also improves structural compactness, facilitating reduction in fan size.

[0011] Preferably, the suction plate is annular, surrounding the central axis and coaxial with it. This annular shape allows it to better fit the fan structure and facilitates its installation and placement. This coaxial positioning of the suction plate around the central axis helps ensure uniform suction between each magnet and the suction plate, ensuring uniform force on the outer rotor during operation and preventing axial runout. This overcomes the problem of unbalanced swinging during fan operation.

[0012] Preferably, a compression spring is further included, a retaining ring is provided on the central shaft, the compression spring and the retaining ring are located on both sides of the bearing, the bearing includes an inner ring and an outer ring, the compression spring is sleeved on the central shaft, the compression spring is pressed between the inner ring and the outer rotor, and the compression spring of the retaining ring presses against the end of the inner ring. In this way, on the one hand, a certain elastic preload can be applied between the bearing and the outer rotor by the compression spring, so that the outer rotor is not easy to swing, thereby improving the operating stability of the outer rotor; on the other hand, because the compression spring presses between the inner ring and the outer rotor, and the compression spring of the retaining ring presses against the end of the inner ring, the outer rotor, the central shaft, the compression spring, the inner ring and the retaining ring can operate synchronously, avoiding the outer rotor, the outer rotor and the compression spring, the compression spring and the inner ring, and the inner ring and the retaining ring from rotating relative to each other, thereby preventing abnormal noise, further improving the operating stability of the fan and reducing noise.

[0013] As a preference, the bearing is a single ball bearing. Compared with oil-containing bearing fans and double ball bearing fans, using a single ball bearing as the bearing of the fan has unique advantages. Specifically,

[0014] Oil-containing bearing fans use oil-containing bearings as the fan bearings. Oil-containing bearings are a more traditional type of fan bearings that reduce friction through the oil film between the shaft and the bearings. Oil-containing bearing fans are low in cost, but they have disadvantages such as performance degradation due to oil volatilization after a period of use, short lifespan, and poor operating stability.

[0015] The double ball bearing fan uses two ball bearings, which have low friction, long life, good anti-aging performance, and are suitable for high speeds. However, its manufacturing cost is high and the noise is relatively loud.

[0016] This solution uses a single ball bearing as the fan bearing. This hybrid of sliding and rolling friction creates a single ball bearing paired with an oil-retaining bearing, reducing the cost of dual ball bearings. The rotor and stator of a single ball bearing are lubricated with balls and lubricated with oil. This overcomes the short lifespan and unstable operation of oil-retaining bearings while minimizing the cost increase. This single ball bearing combines the advantages of both oil-sealed and dual ball bearings, maintaining the relatively low cost of oil-retaining bearing fans while extending the fan's lifespan and operational stability.

[0017] Preferably, a bearing mounting hole is provided in the middle of the base. The bearing is embedded in the bearing mounting hole. The bearing mounting hole is provided in the middle of the base. This facilitates the installation of the bearing. Furthermore, the bearing is embedded in the bearing mounting hole using an interference fit, which effectively improves the installation stability of the bearing and prevents the bearing from moving up and down or becoming loose.

[0018] Preferably, the inner wall of the bearing mounting hole is provided with a stepped surface, the bearing rests on the stepped surface, and the bearing is welded to the inner wall of the bearing mounting hole. The stepped surface on the inner wall of the bearing mounting hole and the bearing resting on the stepped surface further enhance the bearing's installation stability, making it less likely for the bearing to move up and down. Furthermore, the welded connection between the bearing and the inner wall of the bearing mounting hole further secures the bearing and prevents it from loosening or falling off.

[0019] Preferably, a central sleeve is provided in the middle of the base, the inner hole of which forms the bearing mounting hole, the stator sleeve is disposed outside the central sleeve, and the suction plate is annular, surrounding the central sleeve and coaxial with the central axis. This facilitates both actual processing and fabrication, as well as the installation and placement of the suction plate.

[0020] Preferably, the device further comprises an upper cover, which is connected to the base by bolts or snaps, forming a receiving cavity between the upper cover and the base, and the outer rotor motor and the suction blades are both arranged in the receiving cavity. In this way, the motor and blades can be protected by the base and the upper cover.

[0021] The beneficial effects of the utility model are: it can effectively improve the uniformity of force applied to the rotor during operation, and is not prone to axial deflection, thereby overcoming the problem of unbalanced swing during fan operation, extending the service life of the bearing, and reducing abnormal noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model is a schematic diagram of a cross-sectional structure of an anti-sway fan.

[0023] Figure 2 The utility model is an exploded view of an anti-sway fan.

[0024] In the picture:

[0025] Base 1, bearing mounting hole 1.0, middle sleeve 1.1;

[0026] Outer rotor 2, central shaft 2.0, blades 2.1;

[0027] stator 3;

[0028] Bearing 4;

[0029] Compression spring 5;

[0030] Upper cover 6;

[0031] Suction sheet 7;

[0032] Circuit board 8;

[0033] Retaining ring 9. DETAILED DESCRIPTION

[0034] Specific embodiment 1, as Figure 1 、 Figure 2 As shown, an anti-sway fan includes a base 1, an outer rotor 2 motor and a suction plate 7. The outer rotor 2 motor includes an outer rotor 2 and a stator 3, wherein the stator 3 is fixed to the base 1. A plurality of blades 2.1 distributed in sequence in the circumferential direction are fixed to the outer rotor 2. A central axis 2.0 is fixed to the outer rotor 2. The central axis 2.0 of the outer rotor 2 is rotatably set on the base 1 through a bearing 4. The outer rotor 2 includes a plurality of magnets uniformly distributed in the circumferential direction. The suction plate 7 is fixed to the stator 3 or the base 1. The magnets in the outer rotor 2 and the suction plate 7 are distributed axially along the central axis 2.0. The magnets in the outer rotor 2 are located on the same side of the suction plate 7. In this embodiment, the suction plate 7 is made of iron sheet. Suction is generated between the suction plate 7 and the magnets in the outer rotor 2, and the suction between each magnet and the suction plate 7 is the same.

[0035] During operation, the fan with anti-swaying in this embodiment rotates its blades 2.1 through its outer rotor 2. During this process, suction is generated between the suction blades 7 and the magnets in the outer rotor 2. The suction between each magnet and the suction blades 7 is of equal magnitude. This ensures that the outer rotor 2 is evenly stressed during operation, making axial sway less likely. This overcomes the problem of unbalanced swinging during fan operation, extends the service life of the bearings, and reduces abnormal noise.

[0036] Specific embodiment 2, as Figure 1 、 Figure 2As shown, an anti-sway fan includes a base 1, an outer rotor motor 2, and suction blades 7. The outer rotor motor 2 includes an outer rotor 2 and a stator 3, wherein the stator 3 is fixed to the base 1. A plurality of blades 2.1 are fixed to the outer rotor 2 and are distributed sequentially along the circumference. A central shaft 2.0 is fixed to the outer rotor 2. The central shaft 2.0 of the outer rotor 2 is rotatably mounted on the base 1 via bearings 4. The outer rotor 2 includes a plurality of magnets evenly distributed along the circumference.

[0037] The suction sheet 7 is fixed on the stator 3 or the base 1. In this embodiment, the suction sheet 7 is made of iron sheet.

[0038] In one embodiment, the suction sheet 7 is fixed to the stator 3. Specifically, the suction sheet 7 is fixed to one end surface of the stator 3 facing the base 1. In this way, during the actual manufacturing process, the suction sheet 7 can be first installed on the stator 3, and then the suction sheet 7 and the stator 3 can be installed as a whole to the base, which can facilitate the installation of the suction sheet 7.

[0039] In another embodiment, the suction sheet 7 is fixed to the base 1. For example, the suction sheet 7 is fixed to the base 1 by bolts or welding. In this way, the suction sheet 7 and the stator 3 are respectively installed on the base 1.

[0040] The magnets in the outer rotor 2 and the suction plate 7 are distributed axially along the central axis 2.0. Each magnet in the outer rotor 2 is located on the same side of the suction plate 7. An attractive force is generated between the suction plate 7 and the magnets in the outer rotor 2, and the magnitude of the attractive force between each magnet and the suction plate 7 is the same.

[0041] During operation, the fan with anti-swaying in this embodiment rotates its blades 2.1 through its outer rotor 2. During this process, suction is generated between the suction blades 7 and the magnets in the outer rotor 2. The suction between each magnet and the suction blades 7 is of equal magnitude. This ensures that the outer rotor 2 is evenly stressed during operation, making axial sway less likely. This overcomes the problem of unbalanced swinging during fan operation, extends the service life of the bearings, and reduces abnormal noise.

[0042] Specifically, such as Figure 1 、 Figure 2 As shown, an anti-sway fan also includes an upper cover 6. The upper cover 6 is connected to the base 1 via bolts or snaps. A receiving cavity is formed between the upper cover 6 and the base 1. The outer rotor 2 and the suction blades 7 are both arranged in the receiving cavity. In this way, the motor and blades 2.1 are protected by the base 1 and the upper cover 6.

[0043] In this embodiment, the base 1 and the upper cover 6 are both plastic parts. Of course, it should be noted that the base 1 and the upper cover 6 are made of plastic parts only as a preferred solution. The base 1 and the upper cover 6 can also be made of other materials, such as stainless steel, aluminum alloy, etc.

[0044] In this embodiment, the blades 2.1 on the outer rotor 2 are made of plastic material, which can reduce the weight while ensuring the strength and toughness of the blades 2.1.

[0045] Further, such as Figure 1 、 Figure 2 As shown, a bearing mounting hole 1.0 is provided in the center of the base 1. Bearing 4 is embedded in bearing mounting hole 1.0. The bearing mounting hole 1.0 in the center of the base facilitates bearing installation. Furthermore, the bearing is embedded in bearing mounting hole 1.0 using an interference fit, effectively improving bearing installation stability and preventing the bearing from moving up and down or becoming loose.

[0046] The inner wall of the bearing mounting hole 1.0 is provided with a stepped surface, and the bearing 4 abuts against the stepped surface. Since the inner wall of the bearing mounting hole 1.0 is provided with a stepped surface and the bearing abuts against the stepped surface, the installation stability of the bearing can be further improved, and the bearing is not easy to move up and down.

[0047] Furthermore, the bearing 4 is connected to the inner wall of the bearing mounting hole 1.0 by welding. The bearing is connected to the inner wall of the bearing mounting hole 1.0 by welding, which makes the bearing more firmly fixed and prevents the bearing from loosening and falling off.

[0048] In this embodiment, the base 1 is a plastic part, the bearing is a metal part, and the bearing 4 is connected to the inner wall of the bearing mounting hole 1.0 by ultrasonic welding. The use of ultrasonic waves makes the bearing more firmly fixed and prevents the bearing from falling off or loosening.

[0049] Further, such as Figure 1 、 Figure 2 As shown, a middle sleeve 1.1 is provided in the middle of the base, and the inner hole of the middle sleeve 1.1 constitutes the bearing mounting hole 1.0. The stator 3 is sleeved on the outside of the middle sleeve 1.1. The middle sleeve 1.1 and the base are an integrally formed structure. The middle sleeve 1.1 is located in the accommodating cavity formed between the upper cover 6 and the base 1. The stator 3 is sleeved on the outside of the middle sleeve 1.1. In this way, it is convenient for actual processing and manufacturing, and the accommodating cavity formed between the upper cover 6 and the base 1 can be used to accommodate the middle sleeve 1.1, which can further improve the structural compactness of the anti-swing fan and reduce the space occupied by the anti-swing fan in the axial direction of the middle sleeve 1.1.

[0050] In this embodiment, both ends of the middle sleeve 1.1 are open, which is convenient for actual processing and manufacturing.

[0051] Further, such as Figure 1 、 Figure 2As shown, an anti-sway fan also includes a compression spring 5. A retaining ring 9 is provided on the central shaft 2.0. In this embodiment, an annular groove is provided on the central shaft 2.0, and the retaining ring 9 is clamped on the annular groove. The compression spring 5 and the retaining ring 9 are located on both sides of the bearing. The bearing includes an inner ring and an outer ring. The compression spring 5 is sleeved on the central shaft 2.0. The compression spring 5 is pressed between the inner ring and the outer rotor 2, one end of the compression spring 5 is pressed against the end face of the inner ring, and the other end of the compression spring 5 is pressed against the outer rotor 2. Under the action of the compression spring 5, the retaining ring 9 is pressed against the end of the inner ring. In this way, on the one hand, a certain elastic preload can be applied between the bearing and the outer rotor 2 through the compression spring 5, so that the outer rotor 2 is not easy to swing, thereby improving the operating stability of the outer rotor 2; on the other hand, since the compression spring 5 is pressed between the inner ring and the outer rotor 2, and the compression spring 5 of the retaining ring 9 is pressed against the end of the inner ring, the outer rotor 2, the central shaft 2.0, the compression spring 5, the inner ring and the retaining ring 9 can operate synchronously, avoiding the outer rotor 2, the outer rotor 2 and the compression spring 5, the compression spring 5 and the inner ring, and the inner ring and the retaining ring 9 from rotating relative to each other, thereby avoiding abnormal noise, further improving the operating stability of the fan and reducing noise.

[0052] Furthermore, the bearing 4 is a single ball bearing. Compared with the oil-containing bearing fan and the double ball bearing fan, the use of a single ball bearing as the fan bearing has unique advantages. Specifically,

[0053] Oil-bearing fans use oil-bearing bearings, a more traditional type of fan bearing that reduces friction through an oil film between the shaft and the bearing. While oil-bearing fans are relatively inexpensive, they suffer from performance degradation over time due to oil evaporation, resulting in a short lifespan and poor operational stability. Dual-ball bearing fans use two ball bearings, offering advantages such as low friction, long lifespan, good aging resistance, and suitability for high speeds. However, they are expensive to manufacture and relatively noisy.

[0054] This embodiment, however, uses a single ball bearing as the fan bearing. This single ball bearing employs a combination of sliding and rolling friction, reducing the cost of dual ball bearings by pairing one ball bearing with an oil-retaining bearing. The rotor and stator 3 of the single ball bearing are lubricated with balls and lubricating oil, thereby overcoming the short lifespan and unstable operation of oil-retaining bearings while minimizing cost increases. The single ball bearing combines the advantages of both oil-sealed and dual ball bearings, maintaining the relatively low cost advantage of oil-retaining bearing fans while extending the fan's service life and operational stability.

[0055] Of course, it should be noted that the use of a single ball bearing as the bearing is only a preferred solution in this embodiment. In actual production, the bearing may also use other bearings, such as needle bearings, thrust ball bearings, deep groove ball bearings, etc., and oil-containing bearings or double ball bearings may also be used.

[0056] Further, such as Figure 1 、 Figure 2 As shown, the suction plate 7 is annular and surrounds the central axis 2.0, remaining coaxial with the central axis 2.0. This annular shape allows for better integration with the fan structure and facilitates its installation and placement. The suction plate 7 surrounds the central axis 2.0 and remains coaxial with it, ensuring uniform suction between each magnet and the suction plate 7. This ensures uniform force on the outer rotor 2 during operation, preventing axial runout and thus overcoming unbalanced swing during fan operation.

[0057] In this embodiment, an annular suction plate 7 surrounds the outer portion of the central housing 1.1 and is coaxial with the central axis 2.0. This facilitates the installation and placement of the suction plate 7 and helps ensure uniform suction between each magnet and the suction plate 7. This ensures uniform force on the outer rotor 2 during operation, minimizing axial runout and thus overcoming unbalanced swinging during fan operation.

[0058] Specific embodiment 3: The rest of the structure of this embodiment refers to specific embodiment 2, except that:

[0059] like Figure 1 、 Figure 2 As shown, an anti-sway fan further includes a circuit board 8.

[0060] In this embodiment, the suction sheet 7 is fixed to the stator 3. Specifically, the suction sheet 7 is positioned between the stator 3 and the circuit board 8. The circuit board 8 is positioned between the suction sheet 7 and the base 1. The suction sheet 7 and the circuit board 8 are soldered to the iron core of the stator 3 via pins. In this way, the suction sheet 7 and the circuit board 8 can be soldered to the iron core of the stator 3 via pins. This not only facilitates the installation of the suction sheet 7 and ensures that the suction sheet 7 and the circuit board 8 are stably installed on the iron core of the stator 3, but also improves the compactness of the structure, which helps to reduce the size of the fan.

[0061] The suction sheet 7 and the circuit board 8 are welded to the iron core of the stator 3 together through pins. Specifically, a plurality of welding holes distributed circumferentially are provided on the end face of one end of the iron core of the stator 3, and pins are welded in the welding holes. Vias are provided on both the suction sheet 7 and the circuit board 8, and the pins pass through the vias on the suction sheet 7 and the circuit board 8. Then, the pins are welded to the suction sheet 7 and the circuit board 8, so that the suction sheet 7 and the circuit board 8 are welded to the iron core of the stator 3 together through pins.

[0062] Specific embodiment 4: The rest of the structure of this embodiment refers to specific embodiment 2, except that:

[0063] An anti-sway fan further comprises a circuit board. In this embodiment, the circuit board is fixed with bolts on the base 1 or the upper cover 6 (not shown in the figure).

[0064] In this embodiment, the suction sheet 7 is fixed to the stator 3. Specifically, the suction sheet 7 is fixed to the end surface of the stator 3 facing the base 1 by welding or bolting. In this way, during the actual manufacturing process, the suction sheet 7 can be first installed on the stator 3, and then the suction sheet 7 and stator 3 can be installed as a whole to the base, which can facilitate the installation of the suction sheet 7.

[0065] Specific embodiment 4: The rest of the structure of this embodiment refers to specific embodiments 1 to 4, except that:

[0066] In this embodiment, the anti-sway fan further includes a speed sensor (not shown). The speed sensor is used to detect the speed of the outer rotor, and thus the speed of the anti-sway fan. In this way, the fan speed is automatically adjusted according to actual needs, achieving intelligent heat dissipation.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation of the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An anti-sway fan, characterized in that: include base; An outer rotor motor includes an outer rotor and a stator, wherein the stator is fixed to a base, the outer rotor is provided with blades, a central shaft is fixed to the outer rotor, the central shaft of the outer rotor is rotatably arranged on the base via a bearing, and the outer rotor includes a plurality of magnets evenly distributed around the circumference; The suction plate is fixed to the stator or the base. The magnets in the outer rotor and the suction plate are distributed along the axial direction of the central axis, and the magnets in the outer rotor are located on the same side of the suction plate. Suction is generated between the suction plate and the magnets in the outer rotor, and the suction between each magnet and the suction plate is the same. A compression spring and a retaining ring are provided on the central shaft. The compression spring and the retaining ring are located on both sides of the bearing. The bearing includes an inner ring and an outer ring. The compression spring is sleeved on the central shaft. The compression spring is pressed between the inner ring and the outer rotor. The retaining ring is pressed against the end of the inner ring under the action of the compression spring.

2. The anti-sway fan according to claim 1, characterized in that: The suction sheet is fixed on an end surface of the stator facing the base.

3. The anti-sway fan according to claim 2, characterized in that: It also includes a circuit board. The suction piece is located between the stator and the circuit board. The suction piece and the circuit board are welded on the iron core of the stator through pins.

4. An anti-sway fan according to claim 1, 2 or 3, characterized in that: The suction piece is annular, surrounds the central axis and is coaxial with the central axis.

5. The anti-sway fan according to claim 1, 2 or 3, characterized in that: The bearing is a single ball bearing.

6. The anti-sway fan according to claim 1, 2 or 3, characterized in that: A bearing mounting hole is provided in the middle of the base, and the bearing is embedded in the bearing mounting hole.

7. The anti-sway fan according to claim 6, characterized in that: A step surface is provided on the inner wall of the bearing mounting hole, the bearing rests on the step surface, and the bearing and the inner wall of the bearing mounting hole are connected by welding.

8. The anti-sway fan according to claim 6, characterized in that: A middle sleeve is provided in the middle of the base, the inner hole of the middle sleeve constitutes the bearing mounting hole, the stator sleeve is provided outside the middle sleeve, and the suction sheet is annular, surrounding the outside of the middle sleeve and being coaxial with the central axis.

9. The anti-sway fan according to claim 1, 2 or 3, characterized in that: It also includes an upper cover, which is connected to the base by bolts or snaps. A accommodating cavity is formed between the upper cover and the base, and the outer rotor motor and the suction sheet are both arranged in the accommodating cavity.

Images