Fan blade positioning structure

Abstract

The present invention discloses a fan blade positioning structure, including a fan housing, fan blades, a positioning ring, a bearing and a middle tube, wherein the middle tube is fixedly installed in the fan housing, the bearing is inserted in the middle tube, the positioning ring is fixedly installed on the middle tube, and a limit stop wall and a first clip are provided on the positioning ring for axial stopping. The limit stop wall extends radially into the inner side of the middle tube and stops on the upper end surface of the bearing, and a second clip is fixedly provided on the motor housing of the fan blade. The second clip and the first clip can be axially stopped and circumferentially rotated relative to each other. The present invention greatly saves the internal space of the middle tube, and can effectively lengthen the bearing length and the shaft bearing area while keeping the fan height unchanged, while avoiding grooving on the shaft core, thereby improving the shaft core strength and fan quality, extending the service life of the fan, and improving the rotation stability of the fan blades.

Description

Technical Field

[0001] The present invention relates to a heat dissipation fan, and in particular to a fan blade positioning structure. Background Art

[0002] At present, traditional fan center structures all adopt grid buckle ring or lower buckle ring positioning, among which:

[0003] like Figure 1 As shown, the upper buckle type positioning structure is: a buckle is set on the inner side of the upper end of the middle tube, and the buckle 13 located at the upper end of the bearing is pressed by the pressure ring at the upper end of the middle tube. On the one hand, the bearing positioning is realized, and on the other hand, the buckle clamps the annular groove on the outer circumferential wall of the fan blade shaft core to realize the axial stop positioning of the fan blade shaft core. This structure occupies structural space, resulting in a shorter bearing length, affecting the shaft bearing area, affecting the life of the bearing and the fan blade shaft core, and reducing the quality of the fan. In addition, when the shaft core is inserted into the bearing, if there is no guide, it is easy to be crushed during the pressing process;

[0004] like Figure 2 As shown, the lower buckle ring positioning structure is: a lower buckle ring is set between the lower end of the bearing and the middle tube step, and the lower buckle ring clamps the annular groove at the lower end of the circumferential outer wall of the fan blade shaft core to achieve axial stop positioning of the fan blade shaft core. It occupies a large amount of space in the structure, the bearing will be very short, and the shaft bearing area is small, which affects the life and quality of the fan. The bearings and shaft core of the cooling fan are in.

[0005] It can be seen that the two existing fan center structures will occupy the space of the bearing structure, causing the bearing to be forced to be shortened, reducing the service life and quality of the fan. In addition, there will be an extra retaining ring part, which will make the assembly cumbersome and the fan cost high. Summary of the Invention

[0006] In order to overcome the above-mentioned defects, the present invention provides a fan blade positioning structure, which can effectively increase the bearing length and bearing area, thereby improving the service life and overall quality of the fan.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a fan blade positioning structure, including a fan housing, fan blades, a positioning ring, a bearing and a middle tube, the middle tube is fixedly installed in the fan housing, the bearing is inserted in the middle tube, the positioning ring is fixedly installed on the middle tube, and the positioning ring is axially stopped with a limit stop wall and a first clip, the limit stop wall extends radially into the inner side of the middle tube and stops on the upper end face of the bearing, and a second clip is fixedly provided on the motor housing of the fan blade, and the second clip and the first clip can be axially stopped and circumferentially rotated relative to each other.

[0008] As a further improvement of the present invention, the first buckle on the positioning ring is a radially outward-expanding circular ring structure, and the circular ring structure extends a set distance outside the circumference of the middle tube. The second buckle is a hook-shaped structure, and the hook body of the hook-shaped structure just stops at the surface of the circular ring structure on the side away from the fan blade.

[0009] As a further improvement of the present invention, the second buckle is an L-shaped structure or a J-shaped structure, and the surface of the annular structure away from the fan blade is a planar structure or an annular concave structure that matches the second buckle.

[0010] As a further improvement of the present invention, the second clip and the motor housing of the fan blade are fixed in position by welding or a clip-on connection structure.

[0011] As a further improvement of the present invention, the fan motor housing is provided with at least two positioning grooves extending radially along the shaft core, one end of the second clip is fixedly inserted into the positioning groove, and a positioning protrusion is also provided on the side wall of the second clip, and the positioning protrusion is tightly against the surface of the fan motor housing.

[0012] As a further improvement of the present invention, an inner diameter enlarged portion is formed inside the upper end of the middle tube, a clamping gap is formed between the inner side wall of the inner diameter enlarged portion and the outer side wall of the bearing, and a ring sleeve structure extending axially along the middle tube is formed on the positioning ring, and the ring sleeve structure is tightly clamped in the clamping gap.

[0013] As a further improvement of the present invention, an inner diameter contraction portion is formed on the inner side of the lower end of the middle tube, and the lower end of the bearing is tightly against the radial step surface formed by the inner diameter contraction portion of the lower end of the middle tube.

[0014] As a further improvement of the present invention, a friction plate is provided on the bottom surface of the lower end of the middle tube, and the end of the shaft core of the fan blade is tightly against the surface of the friction plate.

[0015] As a further improvement of the present invention, the shaft core end of the fan blade is a spherical surface.

[0016] The beneficial effects of the present invention are as follows: the present invention provides a positioning ring on the middle tube, forms a limiting retaining wall and a first clip on the positioning ring, and realizes axial compression and positioning of the bearing by pressing the upper end face of the bearing through the limiting retaining wall, and at the same time, the first clip is axially stopped and circumferentially rotatable with the second clip on the fan motor housing through the first clip, thereby avoiding the structure of providing a slot and a pressure ring on the shaft core for axial positioning of the fan blade. The first clip and the second clip can be engaged and positioned on the outside of the middle tube, which greatly saves the internal space of the middle tube. When the fan height remains unchanged, the bearing length and the shaft bearing area can be effectively lengthened, while grooving on the shaft core is avoided, the shaft core strength and the fan quality are improved, and the service life of the fan is extended. When the bearing length remains unchanged, the overall height of the fan is reduced, the shaft core strength of the fan blade is enhanced, and since the second clip on the fan blade is located on the fan motor housing and is positioned with the outside of the positioning ring, the rotation stability of the fan blade is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the upper buckle type positioning structure in the prior art;

[0018] Figure 2 This is a schematic diagram of the lower buckle type positioning structure in the prior art;

[0019] Figure 3 This is a schematic diagram of the fan blade state before positioning of the present invention;

[0020] Figure 4 This is a schematic diagram of the fan blades of the present invention after positioning;

[0021] Figure 5 A three-dimensional diagram of the fan blade of the present invention;

[0022] Figure 6 for Figure 5 Enlarged view of part A in the middle;

[0023] Figure 7 It is a three-dimensional diagram of the positioning ring of the present invention. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0025] Example: Please refer to Figure 3 、 4As shown, a fan blade positioning structure includes a fan housing 1, a fan blade 2, a positioning ring 3, a bearing 4 and a middle tube 5. The middle tube 5 is fixedly installed in the fan housing 1, the bearing 4 is inserted in the middle tube 5, and the positioning ring 3 is fixedly installed on the middle tube 5. A limit stop wall 6 and a first clip 7 are provided on the positioning ring 3 for axial stop. The limit stop wall 6 extends radially into the inner side of the middle tube 5 and stops on the upper end surface of the bearing 4. A second clip 8 is fixedly provided on the motor housing of the fan blade 2. The second clip 8 and the first clip 7 can be axially stopped and circumferentially rotated relative to each other. This structure is designed with a first clip 7 on the positioning ring 3 and a second clip 8 on the motor housing of the fan blade 2. The axial positioning of the fan blade 2 is achieved by the engagement of the first clip 7 and the second clip 8. There is no need to provide a circular groove on the shaft core and no need to install a clip ring, which simplifies the structure of the fan center frame. While the fan height remains unchanged, the length of the bearing 4 can be lengthened and the shaft bearing area can be increased, thereby improving the overall quality of the fan, extending the fan life, reducing the fan cost, and improving the rotation stability of the fan blade 2.

[0026] Please refer to Figure 3 、 4 As shown in Figures 5 and 7, the first clip 7 on the positioning ring 3 is a radially outwardly expanding annular structure that extends a set distance outside the circumference of the central tube 5. The second clip 8 is a hook-shaped structure, the hook portion of which just stops the surface of the annular structure on the side away from the fan blade 2. By providing the annular structure on the positioning ring 3 that extends outside the central tube 5 to stop the hook portion of the hook portion extending from the motor housing of the fan blade 2, the fan blade 2 is axially positioned.

[0027] Please refer to Figure 5 、 6 As shown, the second clip 8 is an L-shaped structure or a J-shaped structure, and the surface of the annular structure away from the fan blade 2 is a plane structure or an annular concave structure that matches the second clip 8. The second clip 8 is an L-shaped structure as a whole, and its side wall extending radially along the shaft core stops on the radially outward-expanding annular structure plane surface of the positioning ring 3. When the second clip 8 is a J-shaped structure, its hook portion extends into the annular concave surface of the annular structure. The second clip 8 and the first clip 7 can also be matched by other fastening structures, such as the first clip 7 is a circle of radial grooves on the circumferential outer wall of the positioning ring 3, and the second clip 8 is provided with a sliding pin extending radially along the shaft core, and a fastening connection is provided in the radial groove by inserting the sliding pin, or a radial groove is provided on the axial side wall of the second clip 8 along the shaft core, and the circumferential outer wall of the positioning ring 3 is inserted into the radial groove of the second clip 8 to achieve axial stop positioning. Such structures are equivalent replacement structures that can be easily thought of by those skilled in the art based on this patent and fall within the scope of protection of this patent.

[0028] The second buckle 8 is fixed to the motor housing of the fan blade 2 by welding or snap-fit connection structure. The second buckle 8 is fixed to the motor housing of the fan blade 2 by laser welding, or fixed to the motor housing by snap-fit, or fixed to the motor housing by screws or other connecting parts.

[0029] Please refer to Figure 6 As shown, the motor housing of the fan blade 2 is provided with at least two positioning grooves 10 extending radially along the shaft core. One end of the second clip 8 is fixedly inserted into the positioning groove 10. The side wall of the second clip 8 is also provided with a positioning protrusion 11, which is tightly against the surface of the motor housing of the fan blade 2. The second clip 8 is positioned by the positioning groove 10, and the positioning protrusion 11 on the second clip 8 plays an axial positioning role, ensuring that the second clip 8 and the positioning ring 3 are well positioned and prevented from being too loose or too tight. The positioning groove 10 extends radially and can accommodate middle tubes 5 and positioning rings 3 of different diameters.

[0030] Please refer to the following Figure 3 、 4 shown.

[0031] The upper end of the central tube 5 is formed with an increased inner diameter portion. A clamping gap is formed between the inner sidewall of this increased inner diameter portion of the central tube 5 and the outer sidewall of the bearing. The positioning ring 3 is formed with an annular structure extending axially along the central tube 5. This annular structure is tightly clamped within the aforementioned clamping gap. The annular structure, which clamps the positioning ring 3 between the central tube 5 and the bearing 4, securely positions the positioning ring 3 with the central tube 5. This simple structure allows for positioning of the positioning ring 3 with the central tube 5 by welding or connecting components, or by interference fit.

[0032] The inner side of the lower end of the middle tube 5 forms a section with an inner diameter contraction, and the lower end of the bearing 4 abuts against the radial step formed by the inner diameter contraction of the lower end of the middle tube 5. This structure ensures the positioning of the bearing 4 and simultaneously contracts the inner diameter of the lower end, preventing the shaft core of the fan blade 2 from shaking in the large gap, which helps to make the shaft core of the fan blade 2 more stable during rotation.

[0033] A friction plate 12 is provided on the bottom surface of the lower end of the middle tube 5, and the end of the shaft core of the fan blade 2 is tightly against the surface of the friction plate 12. The friction plate 12 is more wear-resistant and has less friction, which is conducive to the high-speed rotation of the fan blade 2, reduces friction, and avoids damage to the bottom of the middle tube 5.

[0034] The end of the shaft core of the fan blade 2 is a spherical surface.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A fan blade positioning structure, characterized by: The fan comprises a fan housing, a fan blade, a positioning ring, a bearing and a middle tube, wherein the middle tube is fixedly installed in the fan housing, the bearing is inserted in the middle tube, the positioning ring is fixedly installed on the middle tube, and a limit stop wall and a first clip are provided on the positioning ring for axial stop. The limit stop wall radially extends into the inner side of the middle tube and stops on the upper end surface of the bearing. The first clip is radially expanded outward to a set distance outside the circumference of the middle tube. A second clip is fixedly provided on the motor housing of the fan blade, and the second clip and the first clip are snap-fitted and connected so as to be axially stoppable and circumferentially rotatable relative to each other; The second clip includes a first portion extending downward from the lower surface of the motor housing of the fan blade and a positioning protrusion formed by the lower end edge of the first portion extending radially inwardly toward the axial center, wherein the positioning protrusion forms a snap connection with the surface of the first clip on the side away from the fan blade so as to be axially fixed and circumferentially rotatable relative to each other; The second buckle is entirely located outside the outer peripheral surface of the middle tube.

2. The fan blade positioning structure according to claim 1, characterized in that: The first buckle on the positioning ring is a radially outwardly expanding annular structure, and the annular structure extends a set distance outside the circumference of the middle tube, and the second buckle is a hook-shaped structure.

3. The fan blade positioning structure according to claim 2, characterized in that: The second clip is an L-shaped structure or a J-shaped structure, and the surface of the annular structure away from the fan blade is a flat structure or an annular concave structure that matches the second clip.

4. The fan blade positioning structure according to claim 2, characterized in that: The second clip and the motor housing of the fan blade are fixed in position by welding or a clip-on connection structure.

5. The fan blade positioning structure according to claim 4, characterized in that: The motor housing of the fan blade is provided with at least two positioning grooves extending radially along the shaft core, one end of the second clip is fixedly inserted into the positioning groove, and a positioning protrusion is also provided on the side wall of the second clip, and the positioning protrusion is tightly against the surface of the fan blade motor housing.

6. The fan blade positioning structure according to claim 1, characterized in that: An inner diameter enlarged portion is formed inside the upper end of the middle tube, and a clamping gap is formed between the inner side wall of the inner diameter enlarged portion and the outer side wall of the bearing. A ring sleeve structure extending along the axial direction of the middle tube is formed on the positioning ring, and the ring sleeve structure is tightly clamped in the clamping gap.

7. The fan blade positioning structure according to claim 6, characterized in that: The limiting retaining wall is formed by extending radially inwardly from the inner annular surface of the upper end of the annular structure, and the first buckle is formed by extending radially outwardly from the outer annular surface of the upper end of the annular structure; The first buckle is stopped on the upper end surface of the middle tube.

8. The fan blade positioning structure according to claim 1, characterized in that: An inner diameter contraction portion is formed on the inner side of the lower end of the middle tube, and the lower end of the bearing is tightly against a radial step surface formed by the inner diameter contraction portion of the lower end of the middle tube.

9. The fan blade positioning structure according to claim 6, characterized in that: A friction plate is provided on the bottom surface of the lower end of the middle tube, and the shaft core end of the fan blade is tightly against the surface of the friction plate.

10. The fan blade positioning structure according to claim 9, characterized in that: The end portion of the shaft core of the fan blade is a spherical surface.

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