Fan motor structure

Abstract

The present invention discloses a fan motor structure, including a fan blade, a bearing, a middle tube and a buckle ring, a core shaft is coaxially fixed on the fan blade, the core shaft is inserted in the bearing, a radial inner concave ring is formed on the outer circumferential wall of the core shaft, the middle tube includes a bearing positioning part and a buckle ring positioning part, the bearing is inserted in the bearing positioning part, the buckle ring is located in the buckle ring positioning part, the diameter of the buckle ring positioning part is larger than the diameter of the bearing positioning part, an opening is provided on one side of the buckle ring, the buckle ring is buckled on the radial inner concave ring through the opening, the outer edge of the buckle ring is tightly against the inner side wall of the buckle ring positioning part, a guide structure is formed on the buckle ring at a position abutting against the buckle ring positioning part, and a concave surface matched with the guide structure is formed on the upper end of the buckle ring positioning part. The present invention reduces the occupation of frame space, is conducive to the thin and light design of the fan, improves the fan energy efficiency, improves the assembly efficiency, and does not cause the situation of crushing when the core shaft is inserted into the bearing during the assembly process, thereby improving the quality of the fan.

Description

Technical Field

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

[0002] Currently, there are two ways to position the fan blade axis in the central structure design of the cooling fan:

[0003] 1. Upper buckle design (please refer to Figure 1 As shown): an upper buckle ring 16 is installed in the middle tube, and the inner edge of the upper buckle ring is inserted into the radially concave ring on the fan blade core shaft to realize axial positioning of the core shaft. The upper buckle ring 16 is positioned in the middle tube by a retaining ring. When assembling this structure, it is necessary to first assemble the buckle ring to the radially concave ring of the core shaft, and then insert the core shaft into the bearing, while the upper buckle ring 16 is inserted into the middle tube and stopped at the upper end of the bearing. Then, it is necessary to assemble the retaining ring 17 in a narrow space to position the upper buckle ring, which makes assembly inconvenient. Moreover, since the retaining ring 17 is required to position the buckle ring, the structural space is occupied, resulting in a shortened bearing length, which affects the bearing life and fan quality. In addition, there is no automatic guidance during the insertion of the core shaft into the bearing, and it is easy to be crushed during the pressing process.

[0004] 2. Lower buckle design (please refer to Figure 2 As shown): a step surface is designed at the lower end of the middle tube, and a lower retaining ring 18 is clamped by the step surface and the lower end of the bearing. The inner edge of the lower retaining ring 18 is inserted into the radial inner concave ring at the lower end of the core shaft to realize the axial positioning of the core shaft. A retaining ring 17 needs to be installed on the upper end of the bearing to locate the upper end of the bearing. The assembly procedure of this structure is cumbersome and occupies the structural space, resulting in a very short bearing length and a small shaft bearing area, which affects the bearing life and fan quality. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present invention provides a fan motor structure, which can increase the bearing length or reduce the fan thickness, increase the bearing life, save costs, and facilitate assembly.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a fan motor structure, including fan blades, bearings, a middle tube and a retaining ring, the fan blades are coaxially fixed with a core shaft, the core shaft is inserted in the bearing, a radial inner concave ring is formed on the circumferential outer wall of the core shaft, the middle tube includes a bearing positioning part and a retaining ring positioning part arranged at the upper end of the bearing positioning part, the bearing is inserted in the bearing positioning part, the retaining ring is located in the retaining ring positioning part, the inner diameter of the retaining ring positioning part is larger than the inner diameter of the bearing positioning part, an opening is provided on one side of the retaining ring, the inner edge of the retaining ring is inserted in the radial inner concave ring of the core shaft, the outer edge of the retaining ring is tightly against the inner side wall of the retaining ring positioning part, and a guide structure is formed on the retaining ring at a position abutting against the retaining ring positioning part.

[0007] As a further improvement of the present invention, a concave surface cooperating with the guide structure is formed at the upper end of the buckle positioning portion, and the concave surface includes a first vertical surface, a second vertical surface and an inclined surface for connecting the first vertical surface and the second vertical surface, the distance from the first vertical surface to the core shaft is greater than the distance from the second vertical surface to the core shaft, and the difference in distance between the first vertical surface and the second vertical surface along the radial direction of the core shaft is 0.06 mm.

[0008] As a further improvement of the present invention, the difference in distance between the first vertical surface and the outer edge of the buckle along the radial direction of the core shaft is less than 0.03 mm.

[0009] As a further improvement of the present invention, the difference in distance between the first vertical surface and the outer edge of the buckle along the radial direction of the core shaft is 0.01 mm.

[0010] As a further improvement of the present invention, the buckle is an integrated elastic buckle made of elastic material.

[0011] As a further improvement of the present invention, an inner hole is formed in the center of the buckle ring, and an opening connected to the inner hole is formed on the side wall of the buckle ring. The opening is a fan-shaped opening with a width toward the inner hole that is smaller than a width toward the outer edge of the buckle ring.

[0012] As a further improvement of the present invention, the difference in distance between the hole wall of the inner hole of the retaining ring and the shaft wall of the core shaft along the radial direction of the core shaft is 0.03 mm.

[0013] As a further improvement of the present invention, a groove for positioning the fan blade is provided on the upper end surface of the buckle ring with the inner hole as the center, and the maximum radial distance of the groove is smaller than the diameter of the outer edge of the buckle ring.

[0014] As a further improvement of the present invention, the buckle ring includes an inner ring and an outer ring sleeved on the outer edge of the inner ring, an inner hole is formed in the center of the inner ring, the thickness of the outer ring is greater than the thickness of the inner ring, and the upper end surface of the outer ring is connected with the upper end surface of the inner ring through a bevel transition.

[0015] As a further improvement of the present invention, the fan blade is provided with a through hole for assembly extending axially along the core shaft, and the through hole cooperates with a buckle press to assemble the buckle, and one end of the buckle press can pass through the through hole on the fan blade and tightly abut against the upper end of the buckle.

[0016] As a further improvement of the present invention, there are three perforations on the fan blade, which are arranged evenly spaced along the concentric circles of the fan blade.

[0017] As a further improvement of the present invention, the buckle press comprises a pressing body and a plurality of leg parts, each leg part is fixedly mounted on one side of the pressing body part having a flat structure, each leg part can be inserted into a through hole on the fan blade one by one and tightly pressed against the upper end face of the buckle, and the pressing body part is stopped on the outer end face of the fan blade facing away from the middle tube.

[0018] As a further improvement of the present invention, a radially outwardly expanding buckle ring mounting portion is formed on the inner side of the opening end of the middle tube, and the buckle ring is tightly inserted into the buckle ring mounting portion of the middle tube.

[0019] The beneficial effects of the present invention are as follows: the present invention realizes axial positioning of the fan blade core shaft through the C-shaped retaining ring, and simultaneously performs axial positioning of the bearing, thereby saving parts, reducing fan costs, reducing the occupation of frame space, and being conducive to the lightweight design of the fan. The length of the bearing can be increased without changing the thickness of the fan, thereby improving the energy efficiency of the fan. The retaining ring press can realize rapid and smooth assembly of the retaining ring, thereby improving assembly efficiency. During the assembly process, the core shaft will not be crushed when inserted into the bearing, thereby improving the quality of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an upper buckle ring type assembly structure in the prior art;

[0021] Figure 2 It is a lower buckle ring type assembly structure in the prior art;

[0022] Figure 3 It is a schematic structural diagram of the fan motor structure of the present invention before assembly;

[0023] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the buckle of the present invention;

[0025] Figure 6 This is a schematic diagram of the buckle deformation principle of the present invention;

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the fan blade of the present invention;

[0027] Figure 8 It is a schematic diagram of the three-dimensional structure of the buckle pressing tool of the present invention;

[0028] Fig. 9 This is a diagram showing the buckle of the present invention after being pressed into place by a buckle press. DETAILED DESCRIPTION

[0029] 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.

[0030] Example: Please refer to Figure 3 As shown, a fan motor structure includes a fan blade 1, a bearing 2, a middle tube 3 and a retaining ring 6, wherein a core shaft 4 is coaxially fixed on the fan blade 1, a radial inner concave ring 5 is formed on the circumferential outer wall of the core shaft 4, the middle tube 3 includes a bearing positioning portion 31 and a retaining ring positioning portion 32 disposed at the upper end of the bearing positioning portion 31, the bearing 2 is inserted in the bearing positioning portion 31, the retaining ring 6 is located in the retaining ring positioning portion 32, the inner diameter of the retaining ring positioning portion 32 is larger than the inner diameter of the bearing positioning portion 31, an opening 7 is provided on one side of the retaining ring 6, the inner edge of the retaining ring 6 is inserted in the radial inner concave ring 5 of the core shaft 4, the outer edge of the retaining ring 6 is tightly against the inner side wall of the retaining ring positioning portion 32, a guide structure is formed at the position of the retaining ring 6 that abuts against the retaining ring positioning portion 32, and a concave surface 33 matching the guide structure is formed at the upper end of the retaining ring positioning portion 32.

[0031] A radially outwardly expanded buckle ring positioning portion 31 is formed on the inner side of the open end of the middle tube 3 of the present invention, and the buckle ring 6 is tightly inserted into the buckle ring positioning portion 31 of the middle tube 3. The buckle ring 6 is installed and accommodated by the buckle ring positioning portion 31. The concave surface 33 formed between the buckle ring positioning portion 31 and the middle tube 3 can limit the installation depth of the buckle ring 6 to avoid damaging the bearing 2. It is best that the upper end of the bearing 2 is higher than the concave surface 33 between the buckle ring positioning portion 31 and the middle tube 3 by a certain height, ensuring that the buckle ring 6 is tightly pressed against the bearing 2 to avoid the bearing 2 from shaking in the middle tube 3. The outer edge diameter of the buckle ring 6 of the present invention is larger than the diameter of the bearing positioning portion 31, so the buckle ring 6 is set as a C-shaped buckle ring, and an opening 7 is set on one side of the buckle ring 6. The buckle ring 6 is held by the radial inner concave ring 5 through the opening 7. The buckle ring 6 is pressed so that the buckle ring 6 is deformed and fixed in the radial inner concave ring 5. In order to facilitate the downward pressing of the buckle ring 6, the corner of the buckle ring 6 that contacts the bearing 2 and the buckle ring positioning portion 32 is set as a guide structure, and the upper end of the buckle ring positioning portion 32 is formed with a concave surface 33 that cooperates with the guide structure to facilitate the installation of the buckle ring 6. The guide structure improves the convenience of installing the buckle ring 6 and facilitates the installation of the buckle ring 6.

[0032] In one embodiment of the present invention, please refer to Figure 3 , 4 As shown, the concave surface 33 includes a first vertical surface L1, a second vertical surface L2 and an inclined surface for connecting the first vertical surface L1 and the second vertical surface L2. The distance from the first vertical surface L1 to the core shaft 4 is greater than the distance from the second vertical surface L2 to the core shaft 4. The difference in the distance between the first vertical surface L1 and the second vertical surface L2 along the radial direction of the core shaft 4 is 0.06 mm. Please refer to Figure 3 , 4As shown, the first vertical surface L1 is located at the upper end of the second vertical surface L2, that is, the inner diameter of the buckle positioning portion 32 gradually decreases from top to bottom to facilitate positioning of the core shaft 4. In one embodiment of the present invention, please refer to Figure 4 As shown, the difference D1 between the first vertical surface L1 and the outer edge of the buckle 6 in the radial direction of the core shaft 4 is less than 0.03 mm. Preferably, the difference D1 between the first vertical surface L1 and the outer edge of the buckle 6 in the radial direction of the core shaft 4 is 0.01 mm. The difference D1 between the first vertical surface L1 and the outer edge of the buckle 6 in the radial direction of the core shaft 4 of the present invention cannot be too large, otherwise the buckle 6 is easy to fall off, and cannot be too small, otherwise the buckle 6 cannot be pressed into the radial inner concave ring 5 when installed under the action of external force.

[0033] The present invention forms an interference fit fixed positioning by the tight contact between the outer edge of the buckle 6 and the inner wall of the middle tube 3. The inner edge of the buckle 6 is inserted into the radial inner concave ring 5 of the core shaft 4 to form axial positioning of the core shaft 4, thereby preventing the core shaft 4 from detaching. At the same time, the buckle 6 also realizes the axial positioning of the bearing 2. This structure realizes the synchronous axial positioning of the core shaft 4 and the bearing 2 through a buckle 6, thereby avoiding the use of multiple parts. The structure is simple and easy to assemble, and the occupation of the frame space is reduced, which is conducive to the lightweight design of the fan. The length of the bearing 2 can be increased without changing the thickness of the fan, thereby improving the energy efficiency of the fan.

[0034] The buckle ring 6 is an integrated elastic buckle ring 6 made of elastic material. The buckle ring 6 formed of an integrated structure by an elastic material can be elastically deformed during assembly to facilitate assembly. After assembly, the buckle ring 6 can automatically restore to form an axial positioning for the fan core shaft 4. Please refer to Figure 5 , 6 As shown, the buckle 6 has an inner hole 61 formed in the center, and an opening 7 connected to the inner hole 61 is formed on the side wall of the buckle 6. The opening 61 is a fan-shaped opening whose width toward the inner hole 61 is smaller than the width toward the outer edge 62 of the buckle 6. The buckle 6 is elastically deformed to change the inner diameter and outer diameter when pressed by external force through the opening 7. The buckle 6 is preferably made of spring steel to ensure that it has sufficient strength and can be elastically deformed to achieve smooth assembly. Please refer to Figure 6 As shown, the opening 7 on the buckle ring 6 is a fan-shaped opening 7 whose width toward the inner hole is smaller than that toward the outer edge of the buckle ring 6. This opening 7 can avoid interference affecting the elastic deformation of the buckle ring 6 when the buckle ring 6 undergoes elastic deformation during assembly, and the inner and outer edges of the buckle ring 6 can always be kept round during the elastic deformation process. Figure 4 The solid line in the middle is the state diagram before deformation, and the dotted line is the state diagram after deformation.

[0035] The buckle ring 6 is a step structure with an outer edge thickness greater than an inner edge thickness. Figure 5As shown, the thickness at the inner hole 61 of the buckle ring is less than the thickness at the outer edge 62 of the buckle ring 6. Specifically, the upper end surface of the buckle ring 6 is provided with a groove for positioning the fan blade 1 with the inner hole 61 as the center, and the maximum radial distance of the groove is less than the diameter of the outer edge of the buckle ring 6. This structure can maintain the high strength of the outer edge of the buckle ring 6 and maintain stable fixed positioning with the middle tube 3, while improving the elasticity of the inner edge of the buckle ring 6, so that the inner edge can produce axial deformation during the assembly process, so that it can be smoothly inserted into the radial inner concave ring 5 on the core shaft 4.

[0036] In one embodiment of the present invention, please refer to Figure 3 As shown, the difference D2 between the hole wall of the inner hole of the buckle ring 6 and the shaft wall of the core shaft 4 along the radial direction of the core shaft 4 is 0.03 mm. The upper surface of the buckle ring 6 is a step structure, and the fan blade 1 cooperates with the step structure to position the buckle ring 6. Since the buckle ring 6 is made of spring steel, the buckle ring 6 will be elastically deformed when pressed downward under the action of external force. The distance difference D2 between the hole wall of the inner hole of the buckle ring 6 and the shaft wall of the core shaft 4 provides space for the buckle ring 6 to be elastically deformed during assembly.

[0037] The retaining ring 6 includes an upper end face and a lower end face, wherein the lower end face is placed on the first end face of the bearing 2, and the lower end face is a planar structure, wherein the outer ring of the upper end face and the edge of the inner ring form a boss. The retaining ring 6 also includes an inner ring and an outer ring sleeved on the outer edge of the inner ring, wherein an inner hole 61 is formed in the center of the inner ring, and the thickness of the outer ring is greater than that of the inner ring, and the upper end face of the outer ring is connected with the upper end face of the inner ring through an inclined transition, so that the cross section of the outer ring at the opening 7 is a trapezoid. Specifically, the end face of the retaining ring 6 facing the end of the bearing 2 is the lower end face, and the lower end face is a planar structure, and the end face of the retaining ring 6 facing the end of the fan blade 1 is the upper end face, and the upper end face is composed of an outer edge plane 8, an inner edge plane 9, and a connecting inclined surface 10 between the inner edge and the outer edge. The outer edge plane 8 is the upper end surface of the outer ring, and the inner edge plane 9 is the upper end surface of the inner ring. There is a smooth transition between the outer ring and the inner ring. Specifically, the outer edge plane 8 and the inner edge plane 9 are connected by a connecting slope 10.

[0038] The lower end surface of the retaining ring 6 of the present invention presses against the end surface of the bearing 2 through a plane structure to ensure accurate positioning of the bearing 2 and prevent the bearing 2 from tilting. The upper end surface of the retaining ring 6 transitionally connects the outer edge plane 8 and the inner edge plane 9 through a connecting bevel 10 to prevent the retaining ring 6 from breaking during assembly due to stress concentration.

[0039] Please refer to Figure 7As shown, the fan blade 1 is provided with a through hole 11 extending axially along the core shaft 4 for assembly. The through hole 11 cooperates with the buckle ring press 12 to assemble the buckle ring 6. One end of the buckle ring press 12 can pass through the through hole 11 on the fan blade 1 and tightly press against the upper end surface of the buckle ring 6. The buckle ring press 12 presses the buckle ring 6 through the through hole 11 on the fan blade 1, preferably against the outer edge plane 8 of the buckle ring 6, which facilitates the assembly of the buckle ring 6. After the buckle ring 6 is assembled in place, the buckle ring press 12 can be removed. The buckle ring press 12 realizes easy assembly of the buckle ring 6, improves the convenience of assembly, and improves the assembly efficiency of the buckle ring 6.

[0040] The fan blade 1 has three perforations 11, which are arranged evenly spaced along the concentric circles of the fan blade 1. The perforations 11 can also be two, four, five or six, etc., preferably evenly spaced, which is beneficial to the installation accuracy of the buckle 6.

[0041] Please refer to Figure 8 As shown, the buckle ring press 12 includes a pressing body 13 and a plurality of leg parts 14, each leg part 14 is fixedly installed on one side of the pressing body 13 with a flat structure, each leg part 14 can be inserted into the through hole 11 on the fan blade 1 one by one and tightly against the upper end surface of the buckle ring 6, and the pressing body 13 is stopped on the outer end surface of the fan blade 1 facing away from the middle tube 3. The buckle ring press 12 of this structure only needs to insert the leg parts 14 into the through hole 11 of the fan blade 1, and the buckle ring 6 can be easily assembled into place by pressing the surface of the pressing body 13 of the buckle ring press 12. The structure is simple and convenient for operating the buckle ring press 12, and the pressing body 13 can also be used as a limit device for installing the buckle ring 6 in place. When it is attached to the outer surface of the fan blade 1, the buckle ring 6 is installed in place, and the buckle ring 6 cannot be pressed down further, so as to avoid excessive pressure on the buckle ring 6 to damage the bearing 2.

[0042] 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 the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. 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 embodiments of the present invention.

Claims

1. A fan motor structure, characterized in that: It includes a fan blade, a bearing, a middle tube and a buckle ring, wherein a core shaft is coaxially fixed on the fan blade, the core shaft is inserted in the bearing, a radial inner concave ring is formed on the circumferential outer wall of the core shaft, the middle tube includes a bearing positioning part and a buckle ring positioning part arranged at the upper end of the bearing positioning part, the bearing is inserted in the bearing positioning part, the buckle ring is located in the buckle ring positioning part, the inner diameter of the buckle ring positioning part is larger than the inner diameter of the bearing positioning part, an opening is arranged on one side of the buckle ring, the inner edge of the buckle ring is inserted in the radial inner concave ring of the core shaft, the outer edge of the buckle ring is tightly against the inner side wall of the buckle ring positioning part, a guide structure is formed at the position of the buckle ring abutting against the buckle ring positioning part, A concave surface cooperating with the guide structure is formed at the upper end of the buckle positioning portion, and the concave surface includes a first vertical surface, a second vertical surface and an inclined surface for connecting the first vertical surface and the second vertical surface, the distance from the first vertical surface to the core shaft is greater than the distance from the second vertical surface to the core shaft, and the difference in distance between the first vertical surface and the second vertical surface along the radial direction of the core shaft is 0.06mm, and the fan blade is provided with a through hole for assembly extending along the axial direction of the core shaft, and the through hole cooperates with the buckle press to assemble the buckle, and one end of the buckle press can pass through the through hole on the fan blade and tightly press against the upper end of the buckle.

2. The fan motor structure according to claim 1, characterized in that: The difference in distance between the first vertical surface and the outer edge of the buckle ring along the radial direction of the core shaft is less than 0.03 mm.

3. The fan motor structure according to claim 2, characterized in that: The difference in distance between the first vertical surface and the outer edge of the buckle ring along the radial direction of the core shaft is 0.01 mm.

4. The fan motor structure according to claim 1, characterized in that: The buckle ring is an integrated elastic buckle ring made of elastic material.

5. The fan motor structure according to claim 4, characterized in that: An inner hole is formed in the center of the buckle ring, and the opening is connected to the inner hole. The opening is a fan-shaped opening whose width toward the inner hole is smaller than that toward the outer edge of the buckle ring.

6. The fan motor structure according to claim 5, characterized in that: The difference in distance between the hole wall of the inner hole of the buckle ring and the shaft wall of the core shaft along the radial direction of the core shaft is 0.03 mm.

7. The fan motor structure according to claim 5, characterized in that: The upper end surface of the buckle ring is provided with a groove for positioning the fan blade with the inner hole as the center, and the maximum radial distance of the groove is smaller than the diameter of the outer edge of the buckle ring.

8. The fan motor structure according to claim 5, characterized in that: The buckle ring comprises an inner ring and an outer ring sleeved on the outer edge of the inner ring, an inner hole is formed in the center of the inner ring, the thickness of the outer ring is greater than that of the inner ring, and the upper end surface of the outer ring is connected with the upper end surface of the inner ring through an inclined transition.

9. The fan motor structure according to claim 1, characterized in that: The fan blade has three perforations which are evenly spaced and arranged along the concentric circles of the fan blade.

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