Fan frame and cooling fan with same

Abstract

The utility model relates to a fan frame and a cooling fan with the fan frame. The fan frame comprises a substrate, a fan frame and a fan cover, the frame is formed on the periphery of the substrate in an injection molding manner and extends upwards; the roundabout convex part is formed by protruding from one side of the frame to the other side along the thickness direction, a concave surface which is concave inwards is formed on the first side surface of the roundabout convex part of the frame, a convex surface which is convex outwards is formed on the second side surface of the roundabout convex part of the frame, and the roundabout convex part and the roundabout convex part are used for improving the stress deformation of the substrate and improving the flatness of the substrate. And meanwhile, noise can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a fan frame and a cooling fan with the same. BACKGROUND

[0002] A centrifugal fan is a commonly used cooling device, which is often applied to electronic devices (such as notebook computers, etc.) with narrow space and side outlet. In the design and production, a frame is usually injection molded on a metal base. The space surrounded by the frame can be provided with a fan wheel, and an upper cover can be combined with the upper edge of the frame to accommodate the fan wheel.

[0003] However, the cooling fan for narrow space must be thin and light, which causes the base to be stressed and extruded by the frame during injection molding of the frame. Due to the temperature change of the molten plastic forming the frame, the stress distribution of the base is uneven, resulting in deformation of the base, and finally causing the plane of the base to be uneven. In addition, the thin fan limits the configuration space of the fan wheel, making the gap size between the fan wheel and the base and the upper cover in the axial direction smaller. If the plane of the base is uneven, the fan wheel will collide with the base when rotating, resulting in noise and unbalanced operation of the fan, which shortens the service life of the existing cooling fan and reduces the operation efficiency of the fan.

[0004] To solve the above technical problems, the prior art CN215719808U patent (Prior Art One) proposes a technical solution, which is to injection mold a plurality of side wall portions at the outer periphery of the base plate. The plurality of side wall portions are discontinuous, and the plurality of side wall portions have a gap between each other. The gap provides a margin for the plurality of side wall portions to stretch and contract after injection molding, which prevents the extrusion of the base plate caused by the thermal expansion and contraction of the material after injection molding of the side wall portions, and effectively reduces the wrapping force generated by plastic wrapping and the deformation of the base plate. However, this will produce new technical problems. Problem one: the gap directly connects the internal air flow channel with the outside, which will cause air leakage of the fan. Problem two: due to the discontinuous nature of the plurality of side wall portions, the upper ends of the two side wall portions at the gap position are completely independent. When the upper plate is assembled to the upper edge of the side wall portion, the upper edges of the two side wall portions at the gap position are prone to misalignment in the thickness direction. In addition, when the fan wheel rotates at high speed, the upper edges of the two side wall portions at the gap position are prone to vibration and noise.

[0005] Therefore, another solution appears in the prior art, such as CN221144831U patent (Prior Art Two), which mainly tries to solve the above problem one in Prior Art One. Prior Art Two proposes two technical solutions. Solution one is to design the gap as a non-straight through staggered slot (refer to the staggered slot in the upper plate of the patent attached Figures 1 to 9The second solution is to bend the edge of the upper cover to form a bent portion at the position corresponding to the gap, and the bent portion covers the gap to solve the problem of air leakage. However, the first solution of the second prior art only slightly improves the problem of air leakage, but does not completely solve the problem, and the misalignment of the adjacent side wall portions at the gap position and the running vibration problem still exist. In addition, although the second solution of the second prior art can better solve the problem of air leakage, the tolerance (such as assembly tolerance, design tolerance, etc.) exists between the combined position surface of the bent portion and the side wall portion due to the assembly of the upper cover to the side wall portion, which aggravates the running vibration problem and cannot solve the misalignment of the adjacent side wall portions at the gap position, especially the misalignment vibration problem of the upper end edge of the adjacent side wall portions at the gap position.

[0006] Therefore, it is necessary to improve the fan frame of the heat dissipation fan. Content of the utility model

[0007] The purpose of the present application is to provide a fan frame and a heat dissipation fan with the fan frame, which can improve the deformation of the substrate under stress and improve the flatness of the substrate.

[0008] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0009] A fan frame comprises:

[0010] A substrate;

[0011] A frame is injection molded around the substrate and extends upward;

[0012] A detour protrusion is formed by the frame protruding from one side to the other side in the thickness direction, the first side of the frame at the position of the detour protrusion forms a concave surface inwardly recessed, and the second side of the frame at the position of the detour protrusion forms a convex surface outwardly protruded.

[0013] Further, the concave surface extends upward from the joint of the frame and the substrate to the upper edge of the frame.

[0014] Further, the convex surface extends upward from the joint of the frame and the substrate to the upper edge of the frame.

[0015] Further, the depth of the inwardly recessed side surface of the concave surface is not less than 1.5 times the thickness of the frame on either side of the concave surface.

[0016] Further, the cross section formed on the detour protrusion in any plane perpendicular to the up-down direction is the same.

[0017] Further, the cross section of the detour convex part formed along a plane perpendicular to the up-down direction is V-shaped, or W-shaped, or semi-circular, or arc-shaped, or convex polygonal with one side missing.

[0018] To achieve the above object, the present application further discloses the following technical scheme.

[0019] A heat dissipation fan, comprising:

[0020] The base plate is a base of the heat dissipation fan.

[0021] The upper cover is combined to an end edge of the frame away from the base plate, and the base plate, the frame and the upper cover jointly enclose to form a containing space.

[0022] The fan wheel is rotationally combined in the containing space, and the rotation axis of the fan wheel is perpendicular to the plane of the base plate.

[0023] The air inlet is formed through the upper cover and located directly above the fan wheel, and the air inlet is opened along the axial direction of the fan wheel.

[0024] The air outlet is formed at a side position between the upper cover and the base plate, and the air outlet is opened along the radial direction of the fan wheel.

[0025] The detour convex part is formed by the frame protruding along the thickness direction from the inside to the outside of the containing space.

[0026] Further, the lower end of the detour convex part is closed by the extension of the base plate.

[0027] Alternatively, the lower end of the detour convex part is closed by a closing plate, and the closing plate is integrated with the frame and / or the outer frame.

[0028] Further, the heat dissipation fan further comprises:

[0029] The outer frame is injection molded around the base plate and extends upward, the outer frame is annularly arranged outside the second side surface of the frame, and the two ends of the outer frame are integrally connected to different positions of the second side surface of the frame, respectively, the outer frame and the frame enclose to form a closed cavity, and the detour convex part protrudes into the closed cavity.

[0030] The upper cover is combined to an end edge of the frame away from the base plate, and the base plate, the frame and the upper cover jointly enclose to form a containing space.

[0031] Further, the heat dissipation fan further comprises:

[0032] The first surface of the outer frame at the position of the detour outer convex part is formed with a concave surface inwardly recessed.

[0033] The second surface of the frame at the position of the detour outer convex part is formed with a convex surface outwardly protruded.

[0034] The beneficial effects of this application are: it can improve the stress deformation of the substrate and improve the flatness of the substrate. Attached Figure Description

[0035] The present application will be further described below with reference to the views and embodiments.

[0036] Figure 1 This is a three-dimensional schematic diagram of the cooling fan in this application.

[0037] Figure 2 yes Figure 1 The exploded 3D view of the cooling fan shows a detailed 3D schematic of the top cover after it is separated from the frame.

[0038] Figure 3 yes Figure 2 A three-dimensional diagram viewed from another angle.

[0039] Figure 4 This is a top view of the cooling fan of this application after the top cover has been removed.

[0040] Figure 5 yes Figure 3 Enlarged view of the structure within the dashed box.

[0041] Figure 6 yes Figure 5 The first variation of the structure.

[0042] Figure 7 yes Figure 5 The second variation of the structure.

[0043] Figure 8 yes Figure 5 The second variation of the structure.

[0044] Figure 9 yes Figure 4 Enlarged view of the internal structure of the dashed coil.

[0045] Figure 10 yes Figure 9 The first variation of the structure.

[0046] Figure 11 yes Figure 4 Enlarged view of the structure within the dashed box.

[0047] Figure 12 yes Figure 11 The first variation of the structure. Detailed Implementation

[0048] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0049] Please refer to Figures 1 to 5 , Figure 9 and Figure 11 for a schematic diagram of a heat dissipation fan disclosed by the present application. Specifically, the heat dissipation fan comprises a fan frame (not shown), a rotatable fan wheel 3 assembled in the fan frame (i.e. the accommodation space 10 described below) and a stator assembly (not shown). The fan frame comprises a base plate 1 (preferably the base of the heat dissipation fan), a surrounding frame 2 integrally combined with the base plate 1 by injection molding and extending upward, an outer frame 5 combined with the base plate 1 by injection molding and extending upward, and an upper cover 4 arranged at the upper end edge position of the surrounding frame 2. The upper cover 4 is provided with an air inlet 41 formed through it, and an air outlet 201 is formed at one side position between the upper cover 4 and the base plate 1 (in the illustrated scheme of the present application, two air outlets 201 are provided, of course, only one air outlet 201 can also be provided). The base plate 1, the surrounding frame 2 and the upper cover 4 jointly form an accommodation space 10. The fan wheel 3 is located directly below the air inlet 41, and the stator assembly is located directly below the fan wheel 3. A magnetic induction gap is formed between the stator assembly and the fan wheel 3. In use, the stator assembly generates a magnetic field after being energized, which generates magnetic coupling with the fan wheel 3 and drives the fan wheel 3 to rotate. The fan wheel 3 drives air to be sucked in through the air inlet 41 and blown out through the air outlet 201 after rotating, so as to realize the function of driving wind and dissipating heat. In the present application, the heat dissipation fan is a centrifugal fan, the rotating shaft (not numbered) of the fan wheel 3 is perpendicular to the plane of the base plate 1, the air inlet 41 is opened along the axial direction of the fan wheel 3, and the air outlet 201 is opened along the radial direction of the fan wheel 3.

[0050] The outer frame 5 is annularly arranged outside the second side surface (the outer side surface of the frame 2) of the frame 2, and two ends of the outer frame 5 are integrally connected with different positions of the second side surface of the frame 2. One section of the outer side surface of the frame 2 and the outer frame 5 form a closed cavity 50, which has a certain sound absorption and noise reduction effect. Preferably, the upper cover 4 extends and is combined with an end edge (the upper edge of the outer frame 5) of the outer frame 5 away from the substrate 1, and the upper cover 4 closes the upward opening of the closed cavity 50. Further, the inner side surface of the outer frame 5 and the second side surface of the frame 2 are integrally connected through a plurality of connecting walls 52, which can enhance the structural stability of the outer frame 5 and the frame 2. Further, in order to avoid the connecting walls 52 from generating stress on the substrate 1, the connecting walls 52 can be designed to extend along a curved path similar to a wavy line, or the bypass protrusion 21 structure described below can be additionally provided on the connecting walls 52.

[0051] Please refer to Figures 2 to 5 , Figure 9 and Figure 11 , the frame 2 is formed with a bypass protrusion 21 protruding from one side to the other side along the thickness direction. In order to reduce the influence of the bypass protrusion 21 on the air flow channel inside the accommodation space 10, the preferred embodiment is that the bypass protrusion 21 is formed by the frame 2 protruding from the inner side to the outer side along the thickness direction of the accommodation space 10. The first side surface of the frame 2 at the position of the bypass protrusion 21 is formed with a concave surface 211 protruding inwardly, and the second side surface of the frame 2 at the position of the bypass protrusion 21 is formed with a convex surface 212 protruding outwardly. The bypass protrusion 21 can make the injection-molded frame 2 have a deformation allowance, so as to prevent the frame 2 from being stressed and extruded on the substrate 1 due to the condensation shrinkage of the molten plastic material (the hot melt material forming the frame 2) after injection molding, so that the stress of the frame 2 when being molded on the substrate 1 can be dispersed, thereby reducing the influence of the frame 2 after injection molding and condensation on the flatness of the substrate 1, and improving the flatness of the substrate 1.

[0052] Preferably, the concave surface 211 extends upward from the joint of the frame 2 and the substrate 1 to the upper edge of the frame 2. The convex surface 212 extends upward from the joint of the frame 2 and the substrate 1 to the upper edge of the frame 2. In the preferred embodiment, the concave surface 211 is recessed inward along one side surface of the frame 2 by a depth of not less than 1.5 times the thickness of the frame 2 (since the thickness of the frame 2 varies at different positions, here the thickness refers to the thickness of the frame 2 at the positions on both sides of the circumlocution convex part 21, if the thickness of the frame 2 at the positions on both sides of the circumlocution convex part 21 varies, the smaller value is taken). In the preferred embodiment of the application, the cross section of the circumlocution convex part 21 formed in any plane perpendicular to the up-down direction is the same (here it refers to the shape and size of the cross section). Preferably, the cross section of the circumlocution convex part 21 formed in a plane perpendicular to the up-down direction can be designed as V-shaped, W-shaped, semicircular, arc-shaped, or convex polygonal shape with one side missing. In addition, the recessed width (width in the axial direction of the rotation of the fan wheel 3) of the concave surface 211 formed on one side surface (inner side surface) of the frame 2 is preferably designed to be small, preferably the recessed width is not less than 0.5 times the thickness of the frame 2 and not more than 2 times the thickness of the frame. The above structural designs are all to enable the circumlocution convex part 21 to play a better effect and further improve the flatness of the substrate 1.

[0053] In addition, in the embodiment of the application, the outer frame 5 is convexly formed with a circumlocution outer convex part 51 inward in the thickness direction into the closed cavity 50, the first surface of the outer frame 5 at the position of the circumlocution outer convex part 51 is formed with a concave surface 511 recessed inward, and the second surface of the frame 2 at the position of the circumlocution outer convex part 51 is formed with a convex surface 512 convexly outward. Preferably, the basic structure of the circumlocution outer convex part 51 is the same as that of the circumlocution convex part 21 formed on the frame 2.

[0054] Please refer to Figure 3 , Figure 4 and Figure 5 for the application, the part of the frame 2 forming the closed cavity 50 is directly combined on the upper surface of the substrate 1. In other embodiments, the outer frame 5 can be cancelled and not provided, and the frame 2 is directly injection molded at the outermost edge position of the substrate 1, in this way, the circumlocution convex part 21 can be provided as shown in Figure 6 , the structure is preferably that the substrate 1 does not extend to cover the lower part of the circumlocution convex part 21, the lower part of the circumlocution convex part 21 is in a suspended state, of course, the lower part of the circumlocution convex part 21 can be formed with a closed plate (not numbered, formed together with the frame 2 by injection molding) to realize the closed effect between the inside and outside of the accommodation space 10, in this way, the stress pressing on the substrate 1 can be reduced as much as possible, further improving the flatness of the substrate 1. Of course, it can also be designed in the form that the substrate 1 extends to cover the lower part of the circumlocution convex part 21.

[0055] Please refer to Figure 7 ,Figure 8 and ​ As shown in FIG. 5, in the embodiment of the present application, the lower end position of the detour outer protrusion 51 is further formed with an outer connecting portion 513, which surrounds the outer periphery of the substrate 1 at the corresponding position and is integrally connected with the outer frame 5 at both ends and both sides. The outer connecting portion 513 is integrally formed at the same time when the outer frame 5 is injection molded. In the embodiment, the outer connecting portion 513 has the same thickness as the substrate 1 and is flush with the upper and lower surfaces. Of course, it can also be designed as shown in the modified example of FIG. 6, where the outer connecting portion 513 is not provided, and the substrate 1 at the corresponding position of the detour outer protrusion 51 is further extended outward and flush with the outer surface of the outer frame 5. Of course, it can also be designed as shown in the modified example of FIG. 7, where the outer connecting portion 513 is not provided and is empty. Of course, it can also be designed as shown in the modified example of FIG. 8, where the substrate 1 is hollowed out outside the position of the detour outer protrusion 51 to form a notch portion 110. ​ ​ ​

[0056] Through the structural innovation of the detour protrusion 21 and the detour outer protrusion 51, the frame 2 and the outer frame 5 can have a deformation margin when injection molded, which can prevent the frame 2 and the outer frame 5 from being squeezed by the substrate 1 due to the condensation shrinkage of the molten plastic material (hot melt material forming the frame 2 and the outer frame 5) after injection molding, and the stress of the frame 2 and the outer frame 5 when molded on the substrate 1 can be dispersed, thereby improving the flatness of the frame 2 and the outer frame 5 after injection molding and condensation, and improving the flatness of the substrate 1. At the same time, the problems of air flow leakage, noise caused by vibration at the upper end of the gap after the gap is formed, and misalignment of the upper end of the gap in the prior art are solved.

[0057] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application should be defined by the appended claims rather than the foregoing description, and all changes falling within the meaning and range of equivalents of the claims are intended to be embraced therein.

[0058] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not necessarily contain only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.​​​

Claims

1. A fan frame, characterized by, Comprising: a substrate (1); a frame (2) which is injection molded around the substrate (1) and extends upward; a detour protrusion (21) which is formed by the frame (2) protruding from one side to the other side in the thickness direction, the frame (2) forms a concave surface (211) which is recessed inward on the first side of the position of the detour protrusion (21), and the frame (2) forms a convex surface (212) which protrudes outward on the second side of the position of the detour protrusion (21).

2. The fan frame according to claim 1, wherein: the concave surface (211) extends upward from the joint of the frame (2) and the substrate (1) to the upper edge of the frame (2).

3. The fan frame according to claim 1, wherein: the convex surface (212) extends upward from the joint of the frame (2) and the substrate (1) to the upper edge of the frame (2).

4. A fan frame as claimed in claim 1 or 2 or 3 wherein: the depth of the concave surface (211) which is recessed inward along one side surface of the frame (2) is not less than 1.5 times the thickness of the frame (2) on either side of the concave surface (211).

5. The fan frame according to claim 1 or 2 or 3, wherein: the cross section of the detour protrusion (21) formed in any plane perpendicular to the up-down direction is the same.

6. The fan frame according to claim 1 or 2 or 3, wherein: the cross section of the detour protrusion (21) formed in a plane perpendicular to the up-down direction is V-shaped, or W-shaped, or semi-circular, or arc-shaped, or a convex polygon with one side missing.

7. A heat dissipating fan characterized by comprising: Comprising: the fan frame according to any one of claims 1 to 6, wherein the substrate (1) is the base of a heat dissipation fan; an upper cover (4) which is combined to the end edge of the frame (2) away from the substrate (1), and the substrate (1), the frame (2) and the upper cover (4) jointly form a containing space (10); a fan wheel (3) which is rotationally combined in the containing space (10), and the rotation axis of the fan wheel (3) is perpendicular to the plane of the substrate (1); an air inlet (41) which is formed through the upper cover (4) and is located directly above the fan wheel (3), and the air inlet (41) is open in the axial direction of the fan wheel (3); an air outlet (201) which is formed at one side position between the upper cover (4) and the substrate (1), and the air outlet (201) is open in the radial direction of the fan wheel (3); the detour protrusion (21) is formed by the frame (2) protruding from the inside to the outside of the containing space (10) in the thickness direction.

8. The heat dissipating fan of claim 7, wherein: the lower end of the detour protrusion (21) is closed by the extension of the substrate (1); or the lower end of the detour protrusion (21) is closed by a closing plate which is integrated with the frame (2) and / or the outer frame (5).

9. The heat dissipating fan as set forth in claim 7, wherein Further comprising: an outer frame (5) which is injection molded around the substrate (1) and extends upward, the outer frame (5) is annularly arranged on the second side of the frame (2), and the two ends of the outer frame (5) are integrally connected to different positions of the second side of the frame (2), the outer frame (5) and the frame (2) jointly form a closed cavity (50), and the detour protrusion (21) protrudes into the closed cavity (50). The upper cover (4) is combined with the outer frame (5) at the edge of the end away from the base plate (1), and the upper cover (4) closes the upward opening of the closed cavity (50).

10. The heat dissipating fan as set forth in claim 8 or 9, wherein Further comprising: The detour outer convex part (51) is formed by the outer frame (5) protruding into the closed cavity (50) along the thickness direction; The first surface of the outer frame (5) at the position of the detour outer convex part (51) forms a concave surface (511) inwardly recessed; The second surface of the frame (2) at the position of the detour outer convex part (51) forms a convex surface (512) outwardly protruded.

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