Fan frame and cooling fan with same

Abstract

The invention 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 heat dissipation fan having the fan frame. Background Art

[0002] A centrifugal fan is a commonly used heat dissipation device, which is often used in electronic devices with narrow space and air outlets on the side (such as laptops). During design and production, a frame is generally injection-molded on a metal base. A fan wheel can be set in the space surrounded by the frame, and a top cover can be combined with the upper edge of the frame to accommodate the fan wheel.

[0003] However, the cooling fan used in a narrow space must be thin and lightweight, which results in the base being subjected to the stress of the frame when the frame is injection molded. The thin base will be squeezed by the stress of the frame (due to the temperature change of the molten plastic forming the frame), causing the stress distribution of the base to be uneven and deformed, and finally causing the base to be uneven. In addition, the thin fan limits the configuration space of the impeller, making the gap between the impeller and the base and the upper cover along the axial direction smaller. If the base is uneven, the impeller will collide with the base when rotating, causing the fan to make noise and the fan to run unbalanced, shortening the service life of the existing cooling fan and reducing the fan operation efficiency.

[0004] In order to address the above technical problems, the prior art CN215719808U patent (prior art 1) proposes a technical solution, specifically: a plurality of side wall portions are injection-molded at the outer periphery of the substrate, the plurality of side wall portions are discontinuous, and there is a gap between the plurality of side wall portions, and the gap is used to provide the plurality of injection-molded side wall portions with expansion and contraction margin, so as to prevent the thermal expansion and contraction of the material after the side wall portions are injection-molded from squeezing the substrate, and also effectively reduce the wrapping force generated by the plastic injection and reduce the deformation of the substrate. However, this will give rise to new technical problems. Problem 1: The gap directly connects the internal air flow channel with the outside world, which may cause airflow leakage in the fan. Problem 2: Since the multiple side wall portions are discontinuous, 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 along 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 vibrate and generate noise.

[0005] Therefore, another solution has emerged in the prior art, such as CN221144831U patent (prior art 2), which mainly attempts to solve the above-mentioned problem 1 in prior art 1. Prior art 2 proposes two technical solutions. Solution 1 is: by designing the gap into a non-straight-through staggered detour groove (refer to the attached patent Figures 1 to 9Embodiment display), to reduce the occurrence of airflow leaking to the outside of the fan through the gap. Solution 2 is: a bent portion is bent and extended at the edge of the upper cover, the position of the bent portion corresponds to the gap, and the gap is shielded by the bent portion to solve the problem of airflow leakage in the gap. However, compared with the prior art 1, the solution 1 in the prior art 2 only slightly improves the problem of air leakage in the gap, but does not completely solve the problem, and there are also problems of misalignment of adjacent side wall parts at the gap position and operation vibration. In addition, although the solution 2 in the prior art 2 can better solve the problem of airflow leakage in the gap, since the upper cover is generally assembled to the side wall part, there is a tolerance (such as assembly tolerance, design tolerance, etc.) between the surfaces of the combined position of the bent portion and the side wall part, which aggravates the problem of operation vibration, and at the same time, it cannot solve the problem of misalignment of adjacent side wall parts at the gap position, especially the problem of misalignment and vibration of the upper end edge of the adjacent side wall part at the gap position.

[0006] In view of this, the fan frame of the existing heat dissipation fan still needs to be improved. Summary of the invention

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

[0008] To achieve the above objectives, this application adopts the following technical solutions: A fan frame, comprising: substrate; A frame is injection molded around the substrate and extends upward; The detour convex portion is formed by the frame convexing from one side to the other side along the thickness direction. The frame forms an inwardly recessed concave surface on the first side surface of the detour convex portion, and the frame forms an outwardly protruding convex surface on the second side surface of the detour convex portion.

[0009] Furthermore, the concave surface extends upward from a junction between the frame and the substrate to an upper edge of the frame.

[0010] Furthermore, the convex surface extends upward from a junction between the frame and the substrate to an upper edge of the frame.

[0011] Furthermore, the depth of the concave surface along one side surface of the frame is not less than 1.5 times the thickness of the frame on either side of the concave surface.

[0012] Furthermore, the cross sections formed on the meandering convex portion along any plane perpendicular to the up-down direction are all the same.

[0013] Furthermore, the cross section formed on the winding convex portion along a plane perpendicular to the up-down direction is V-shaped, or W-shaped, or semicircular, or arc-shaped, or a convex multi-deformation with one side missing.

[0014] To achieve the above objectives, this application also discloses the following technical solutions: A heat dissipation fan, comprising: A fan frame as described in any one of the above items, wherein the substrate is a base of a cooling fan; An upper cover is combined with an edge of the frame away from the substrate, and the substrate, the frame and the upper cover are jointly arranged to form a containing space; A fan wheel is rotatably coupled to the accommodating space, and a rotating axis of the fan wheel is perpendicular to the plane of the base plate; An air inlet is formed through the upper cover and is located directly above the impeller, and the air inlet is opened along the axial direction of the impeller; An air outlet is formed at one side between the upper cover and the base plate, and the air outlet opens along the radial direction of the fan wheel; The detour convex portion is formed by the frame protruding from the inner side to the outer side of the accommodating space along the thickness direction.

[0015] Furthermore, the lower end of the meandering protrusion is extended and covered by the base plate to be closed; Alternatively, the lower end of the detour protrusion is covered and closed by a closing plate, and the closing plate is integrated with the frame and / or the outer frame.

[0016] Furthermore, it also includes: An outer frame is injection molded around the substrate and extends upward, the outer frame is arranged outside the second side surface of the frame, two ends of the outer frame are respectively connected to different positions of the second side surface of the frame, the outer frame and the frame are arranged to form a closed cavity, and the detour protrusion protrudes into the closed cavity; The upper cover is combined with an edge of the outer frame away from the substrate, and the upper cover closes the upward opening of the closed cavity.

[0017] Furthermore, it also includes: a circuitous outer protrusion formed by the outer frame protruding into the closed cavity along the thickness direction; The outer frame forms a concave surface which is sunken inwards on the first surface of the winding outer convex portion; The frame forms a convex surface protruding outward on the second surface of the winding outer protrusion.

[0018] The beneficial effects of the present application are as follows: the deformation of the substrate due to stress can be improved, and the flatness of the substrate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present application will be further described below in conjunction with drawings and embodiments.

[0020] Figure 1 It is a three-dimensional schematic diagram of the heat dissipation fan of the present application.

[0021] Figure 2 yes Figure 1 A partial exploded view of the cooling fan in the middle, specifically showing the three-dimensional schematic diagram after the upper cover is separated from the frame.

[0022] Figure 3 yes Figure 2 A three-dimensional diagram from another angle.

[0023] Figure 4 This is a top view of the cooling fan of the present application with the upper cover removed.

[0024] Figure 5 yes Figure 3 A magnified view of the structure within the dashed box.

[0025] Figure 6 yes Figure 5 A first variation of the structure in FIG.

[0026] Figure 7 yes Figure 5 A second variation of the structure in FIG.

[0027] Figure 8 yes Figure 5 A second variation of the structure in FIG.

[0028] Fig. 9 yes Figure 4 Enlarged view of the structure within the dotted circle.

[0029] Fig.10 yes Fig. 9 A first variation of the structure in FIG.

[0030] Fig.11 yes Figure 4 A magnified view of the structure within the dashed box.

[0031] Fig.12 yes Fig.11 A first variation of the structure in FIG. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] Please refer to Figures 1 to 5 , Fig. 9 and Fig.11As shown, it is a schematic diagram of a cooling fan disclosed in the present application. Specifically, the cooling fan includes a fan frame (not shown), a fan wheel 3 rotatably assembled in the fan frame (that is, the accommodating space 10 described below), and a stator assembly (not shown). The fan frame includes a substrate 1 (preferably a base of a cooling fan), a frame 2 integrally combined with the periphery of the substrate 1 by injection molding and extending upward, an outer frame 5 combined with the periphery of the substrate 1 by injection molding and extending upward, and an upper cover 4 covering the upper edge of the frame 2. An air inlet 41 is formed through the upper cover 4, and an air outlet 201 is formed at one side between the upper cover 4 and the substrate 1 (in the illustrated scheme of the present application, two air outlets 201 are provided, and of course only one air outlet 201 can also be provided). The substrate 1, the frame 2 and the upper cover 4 are jointly arranged to form an accommodating 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. When in use, the stator assembly generates a magnetic field after being energized, and then generates magnetic coupling with the fan wheel 3 and drives the fan wheel 3 to rotate. After the fan wheel 3 rotates, it drives air to be sucked in through the air inlet 41 and blown out through the air outlet 201 to achieve the function of expelling wind and dissipating heat. In the present application, the cooling fan is a centrifugal fan, the rotating shaft (unnumbered) of the fan wheel 3 is perpendicular to the plane of the substrate 1, the air inlet 41 opens along the axial direction of the fan wheel 3, and the air outlet 201 opens along the radial direction of the fan wheel 3.

[0034] Among them, the outer frame 5 is arranged outside the second side surface of the frame 2 (with the accommodation space 10 described below as a reference, that is, the outer side surface of the frame 2), and the two ends of the outer frame 5 are respectively connected to different positions of the second side surface of the frame 2. The outer frame 5 and one section of the outer side surface of the frame 2 are surrounded to form a closed cavity 50, and the closed cavity 50 has a certain sound absorption and noise reduction effect. Preferably, the upper cover 4 extends and is combined with an end edge of the outer frame 5 away from the substrate 1 (the upper edge of the outer frame 5), and the upper cover 4 closes the upward opening of the closed cavity 50. Further, the inner side surface of the outer frame 5 is also connected to the second side surface of the frame 2 through a plurality of connecting walls 52, and the connecting wall 52 can enhance the structural stability of the outer frame 5 and the frame 2. Further, in order to avoid the connecting wall 52 from generating stress extrusion on the substrate 1, the connecting wall 52 can be designed to extend along a curved path similar to a wave line shape as a whole, or a detour convex portion 21 structure described below is added to the connecting wall 52.

[0035] Please refer to Figures 2 to 5 , Fig. 9 and Fig.11As shown, the frame 2 is formed with a detour convex portion 21 protruding from one side to the other side along the thickness direction. In order to reduce the influence of the detour convex portion 21 on the air flow path inside the accommodating space 10, a preferred embodiment is as follows: the detour convex portion 21 is formed by the frame 2 protruding from the inner side to the outer side of the accommodating space 10 along the thickness direction. The frame 2 forms a concave surface 211 that is recessed inwardly on the first side surface at the position of the detour convex portion 21, and the frame 2 forms a convex surface 212 that protrudes outwardly on the second side surface at the position of the detour convex portion 21. The detour convex portion 21 can make the injection-molded frame 2 have a deformation margin, so that the frame 2 can be prevented from generating stress extrusion on the substrate 1 due to the condensation and shrinkage of the molten plastic material (hot-melt material forming the frame 2) after injection molding, so that the stress of the frame 2 when it is 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, thereby improving the flatness of the substrate 1.

[0036] Preferably, the concave surface 211 extends upward from the junction of the frame 2 and the substrate 1 to the upper edge of the frame 2. The convex surface 212 extends upward from the junction of the frame 2 and the substrate 1 to the upper edge of the frame 2. In a preferred embodiment, the depth of the concave surface 211 along the surface of one side of the frame 2 is not less than 1.5 times the thickness of the frame 2 (Note: Since the thickness of the frame 2 at different positions is different, the thickness here refers to the thickness of the frame 2 at both sides of the detour convex portion 21. If the thickness of the frame 2 at both sides of the detour convex portion 21 is different, the smaller value is taken). In a preferred embodiment of the present application, the cross-section formed on the detour convex portion 21 along any plane perpendicular to the up and down direction is the same (here refers to the shape and size of the cross-section). Preferably, the cross-section formed on the detour convex portion 21 along the plane perpendicular to the up and down direction can be designed to be: V-shaped, or W-shaped, or semicircular, or arc-shaped, or a convex multi-deformation with one side missing. In addition, the concave width (the width along the axial direction of the rotation of the impeller 3) formed by the concave surface 211 on one side surface (inner side) of the frame 2 is preferably designed to be small, preferably the concave 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 for enabling the circuitous convex portion 21 to play a better effect and further improve the flatness of the substrate 1.

[0037] In addition, in the embodiment of the present application, the outer frame 5 protrudes into the closed cavity 50 along the thickness direction to form a detour outer convex portion 51, the outer frame 5 forms an inwardly concave surface 511 on the first surface at the position of the detour outer convex portion 51, and the frame 2 forms an outwardly protruding convex surface 512 on the second surface at the position of the detour outer convex portion 51. Preferably, the basic structure of the detour outer convex portion 51 is the same as the detour convex portion 21 formed on the frame 2.

[0038] Please refer to Figure 3 , Figure 4 and Fig.11 As shown, in the present application, the part of the frame 2 that forms the closed cavity 50 is directly combined with the upper surface of the substrate 1. In other embodiments, the outer frame 5 can be eliminated and the frame 2 can be directly injection molded at the outermost edge of the substrate 1. In this way, the detour convex portion 21 can be set as follows Fig.12 In the manner shown, the structure is preferably that the substrate 1 does not extend to cover the lower part of the detour convex portion 21, and the lower part of the detour convex portion 21 is suspended. Of course, a closing plate (not numbered, formed together with the injection-molded frame 2) can be formed by injection molding below the detour convex portion 21 to achieve the sealing effect inside and outside the accommodating space 10, so that the stress extrusion on the substrate 1 can be reduced as much as possible, and the flatness of the substrate 1 can be further improved. Of course, it can also be designed to extend the substrate 1 to cover the lower part of the detour convex portion 21.

[0039] Please refer to Figure 3 , Figure 4 and Figure 5 As shown, in the embodiment of the present application, the lower end of the detour convex portion 51 is also formed with an outer connecting portion 513, the outer connecting portion 513 surrounds the outer periphery of the substrate 1 combined with the corresponding position and the two ends are integrally connected to the outer frame 5 on both sides, and the outer connecting portion 513 is formed synchronously and integrally when the outer frame 5 is injection molded. In this embodiment, the outer connecting portion 513 is equal in thickness to the substrate 1 and the upper and lower surfaces are flush. Of course, it can also be designed as follows Figure 6 In the modified example shown, the outer connecting portion 513 may not be provided, and the substrate 1 at the corresponding position of the winding 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 follows Figure 7 In the modified example shown, the outer connecting portion 513 may be left blank. Figure 8 In the illustrated variation, the substrate 1 is hollowed out outside the detour convex portion 51 to form a notch portion 110 .

[0040] Through the structural innovation of the detour convex portion 21 and the detour outer convex portion 51 of the present application, the injection-molded frame 2 and outer frame 5 can have a deformation margin, so that the frame 2 and outer frame 5 can be prevented from squeezing the substrate 1 due to the condensation and shrinkage of the molten plastic material (the hot-melt material forming the frame 2 and outer frame 5) after injection molding, so that the stress of the frame 2 and outer frame 5 when molded on the substrate 1 can be dispersed, thereby improving the flatness of the substrate 1 after the injection molding and condensation of the frame 2 and outer frame 5. At the same time, the problems of fan airflow leakage, the problem of noise generated by vibration at the upper end edge of the gap position after the gap is formed, and the problem of misalignment of the upper end edge of the gap position in the prior art are solved.

[0041] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0042] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A fan frame, characterized in that: include: substrate(1); A frame (2) is injection-molded around the substrate (1) and extends upward; The detour convex portion (21) is formed by the frame (2) convexing from one side to the other side along the thickness direction, the frame (2) forming an inwardly recessed concave surface (211) on a first side surface at the position of the detour convex portion (21), and the frame (2) forming an outwardly protruding convex surface (212) on a second side surface at the position of the detour convex portion (21).

2. The fan frame according to claim 1, characterized in that: The concave surface (211) extends upwards from the junction of the frame (2) and the base plate (1) to the upper edge of the frame (2).

3. The fan frame according to claim 1, characterized in that: The convex surface (212) extends upward from the junction of the frame (2) and the base plate (1) to the upper edge of the frame (2).

4. The fan frame according to claim 1, 2 or 3, characterized in that: The depth of the concave surface (211) recessed inwardly 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, 2 or 3, characterized in that: The cross-section formed on the detour convex portion (21) along any plane perpendicular to the up-down direction is the same.

6. The fan frame according to claim 1, 2 or 3, characterized in that: The cross section formed on the winding convex portion (21) along a plane perpendicular to the up-down direction is V-shaped, W-shaped, semicircular, arc-shaped, or convex with one side missing.

7. A cooling fan, characterized in that: include: The fan frame according to any one of claims 1 to 6, wherein the substrate (1) is a base of a cooling fan; An upper cover (4) is coupled to an edge of the frame (2) at one end away from the substrate (1), wherein the substrate (1), the frame (2) and the upper cover (4) are jointly arranged to form a containing space (10); A fan wheel (3) is rotatably coupled to the accommodating space (10), and a rotation axis of the fan wheel (3) is perpendicular to the plane of the base plate (1); An air inlet (41) is formed through the upper cover (4) and is located directly above the impeller (3), and the air inlet (41) is opened along the axial direction of the impeller (3); An air outlet (201) is formed at a side position between the upper cover (4) and the base plate (1), and the air outlet (201) opens along the radial direction of the impeller (3); The detour protrusion (21) is formed by the frame (2) protruding from the inner side to the outer side of the accommodating space (10) along the thickness direction.

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

9. The heat dissipation fan according to claim 7, characterized in that: Also includes: an outer frame (5) which is injection-molded around the substrate (1) and extends upwards, the outer frame (5) being arranged outside the second side surface of the frame (2), the two ends of the outer frame (5) being integrally connected to different positions of the second side surface of the frame (2), the outer frame (5) and the frame (2) enclosing a closed cavity (50), the detour protrusion (21) protruding into the closed cavity (50); The upper cover (4) is combined with an edge of the outer frame (5) at one end away from the base plate (1), and the upper cover (4) closes the upward opening of the closed cavity (50).

10. The heat dissipation fan according to claim 8 or 9, characterized in that: Also includes: a circuitous outer protrusion (51) formed by the outer frame (5) protruding into the closed cavity (50) along the thickness direction; The outer frame (5) forms a concave surface (511) that is recessed inwards on a first surface at the position of the winding outer convex portion (51); The frame (2) forms a convex surface (512) protruding outward on the second surface at the position of the winding outer convex portion (51).

Images