Heat dissipation device and electronic device

Abstract

The application provides a heat dissipation device and electronic equipment, the heat dissipation assembly includes fan and deflector, the deflector is located the air inlet end of the fan, and it is opposite with the fan arrangement, the deflector includes first part and second part, the first part is equipped with installation through hole, the installation through hole penetrates the first part along the thickness direction of the deflector, along the direction of the air inlet end to the air outlet end of the heat dissipation device, the hole diameter of the installation through hole gradually reduces, the second part is installed in the installation through hole, and it is spaced apart with the hole wall of the installation through hole arrangement.The technical scheme of the application can improve the turbulent flow in front of the fan, guide the airflow to the optimal working area of the fan, thereby making the rotation of the fan more stable, making the working efficiency of the fan higher, reducing the energy loss of the vortex generated by the airflow collision between the high and low pressure areas of the fan blades, and the aerodynamic noise generated by the vortex breaking.

Description

Technical Field

[0001] This application relates to the field of heat dissipation technology, and in particular to a heat dissipation device and electronic device. Background Technology

[0002] Currently, most electronic devices use fans to cool their internal components. Fans create airflow within the device, carrying away heat from the heated components and thus cooling them. As electronic devices become more powerful and feature-rich, the internal components accumulate more heat during operation. Increasing fan speed is typically used to cool these components more effectively. However, excessively high fan speeds can cause turbulence at the fan intake, resulting in significant aerodynamic noise and negatively impacting the user experience. Summary of the Invention

[0003] The embodiments of this application provide a heat dissipation device and electronic device that can improve the turbulence at the front end of the fan, guide the airflow to the optimal working area of ​​the fan, thereby making the fan rotation more stable, improving the working efficiency of the fan, reducing the energy loss of eddies generated by the airflow collision in the high and low pressure areas of the fan blades, and reducing the aerodynamic noise generated by eddy rupture.

[0004] In a first aspect, this application provides a heat dissipation device, including a fan and a guide plate. The guide plate is located at the air inlet end of the fan and is disposed opposite to the fan. The guide plate includes a first part and a second part. The first part is provided with a mounting through hole. The mounting through hole penetrates the first part along the thickness direction of the guide plate. Along the direction from the air inlet end to the air outlet end of the heat dissipation device, the diameter of the mounting through hole gradually decreases. The second part is installed in the mounting through hole and is spaced apart from the hole wall of the mounting through hole.

[0005] Understandably, the first part can integrate the airflow. When the airflow flows from one side of the air inlet end of the guide plate through the installation through hole to one side of the air outlet end of the guide plate, and because the diameter of the installation through hole gradually decreases from the air inlet end to the air outlet end, the airflow direction will be concentrated, thereby achieving the effect of integrating the airflow.

[0006] In one possible implementation, the second part includes a first annular surface, which is disposed opposite to the wall of the mounting through hole. The circumferential surface includes the first annular surface, and the diameter of the first annular surface gradually decreases along the direction from the air inlet end to the air outlet end of the heat dissipation device.

[0007] Understandably, in actual use, when the fan rotates for ventilation, the gas will flow from the side of the second part away from the fan through the first annular surface to the side of the second part facing the fan. As the diameter of the first annular surface gradually decreases along the direction from the air inlet to the air outlet of the heat dissipation device, the flow direction of the gas gradually changes as it flows along the first annular surface, eventually converging and blowing towards the fan.

[0008] In one possible implementation, the second part further includes an air inlet surface, which is the surface of the second part facing the air inlet end of the heat dissipation device, and the air inlet surface is a convex surface.

[0009] In one possible implementation, the air inlet surface includes a central region and an edge region, the central region being a plane and the edge region being a convex surface, the edge region surrounding the central region.

[0010] Understandably, the air intake surface can guide the airflow, causing it to flow from the central area to the edge area, and then blow towards the fan through the gap between the first and second parts.

[0011] In one possible implementation, the first portion includes a first surface, which is the surface of the first portion facing the fan, and the maximum included angle between the wall of the mounting through hole and the first surface is an acute angle.

[0012] It is understandable that when the maximum angle between the hole wall and the first surface is an acute angle, the airflow can enter the fan in a concentrated state. After the airflow is integrated, it can flow to the optimal working area of ​​the blades, reducing the airflow flowing to the end of the blades away from the hub, thereby reducing the resistance of the blades to the airflow and reducing the conflict between the airflow and the blades. This can improve the air intake effect of the fan while reducing the noise of the fan.

[0013] In one possible implementation, the guide plate has a central axis, the guide plate is centrally symmetrical about the central axis, the axis of the mounting through hole coincides with the central axis, and the axis of the second part coincides with the central axis.

[0014] In one possible implementation, the fan includes a mounting bracket and a rotor, the rotor being mounted inside the mounting bracket and rotatable relative to the mounting bracket, the rotor including a hub and a plurality of blades, the plurality of blades being fixedly connected to the hub and spaced apart around the hub.

[0015] In one possible implementation, the diameter of the outer edge of the rotor is a first diameter, and the diameter of the opening of the mounting through hole on the first surface is a second diameter, the second diameter being equal to the first diameter.

[0016] Understandably, when the first diameter is larger than the second diameter, the airflow gathered by the guide plate can only reach a portion of the fan, preventing full utilization of the fan and thus reducing its cooling efficiency. When the first diameter is smaller than the second diameter, the airflow gathered by the guide plate extends beyond the outer edge of the fan, and some airflow collides with the mounting bracket, altering its direction and causing turbulence again. This uncontrollable airflow direction and turbulence impacting the blades result in significant noise from the high-speed fan, negatively impacting the user experience. In this embodiment, because the first and second diameters are the same, the airflow gathered by the guide plate can reach the entire fan area without impacting the mounting bracket and generating noise. This improves the fan's cooling efficiency while reducing operating noise, providing a better user experience.

[0017] In one possible implementation, the second portion includes a leeward surface, which is the surface of the second portion facing the fan, and the diameter of the leeward surface is equal to the diameter of the hub.

[0018] In one possible implementation, the deflector further includes a connecting portion, which is fixedly connected between the first portion and the second portion.

[0019] Understandably, having the diameter of the leeward side equal to the diameter of the hub allows the airflow integrated by the deflector to be directed towards the blades, which helps improve the fan's efficiency.

[0020] Secondly, this application provides an electronic device, including a functional component and a heat dissipation device as described above, wherein the functional component is located at the air outlet end of the heat dissipation device. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application;

[0023] Figure 2 yes Figure 1 The diagram shows the structure of the fan.

[0024] Figure 3 yes Figure 1 The diagram shows the structure of the guide vane.

[0025] Figure 4 yes Figure 3 A schematic diagram of the first part of the guide vane shown;

[0026] Figure 5 yes Figure 4 A schematic cross-sectional view of the first part is shown;

[0027] Figure 6 yes Figure 4 Another cross-sectional schematic diagram of the first part is shown;

[0028] Figure 7 yes Figure 3 A schematic diagram of the second part of the guide vane shown;

[0029] Figure 8 yes Figure 7 A cross-sectional schematic diagram of the second part of the guide vane shown;

[0030] Figure 9 yes Figure 1 A schematic diagram showing the gas flow direction when the electronic device is working;

[0031] Figure 10 yes Figure 3 A schematic diagram of the airflow direction under the cross-sectional view of the deflector shown;

[0032] Figure 11 yes Figure 1 The diagram shows a simulation of the airflow direction when the electronic device is in operation. Detailed Implementation

[0033] For ease of understanding, the terminology used in the embodiments of this application will be explained first.

[0034] And / or: This is simply a way of describing the relationship between related objects. It indicates that there can be three kinds of relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0035] Multiple: refers to two or more.

[0036] Connection: should be interpreted broadly. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through an intermediary.

[0037] The specific embodiments of this application will now be clearly described in conjunction with the accompanying drawings.

[0038] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the electronic device 1000 provided in the embodiments of this application.

[0039] Electronic device 1000 includes a chassis 100, a functional component 200, and a heat dissipation device 300. Both the functional component 200 and the heat dissipation device 300 are installed inside the chassis 100. The heat dissipation device 300 is located on one side of the functional component 200 and is positioned opposite to it. When the functional component 200 operates, it generates heat. The heat dissipation device 300 blows airflow towards the functional component 200, carrying away the heat and thus preventing the functional component 200 from malfunctioning due to overheating.

[0040] The electronic device 1000 can be, but is not limited to, a server, router, switch, supercomputer, AI (Artificial Intelligence) device, or vehicle-mounted device. The following explanation uses the electronic device 1000 as a server as an example, but it should be understood that this is not a limitation.

[0041] The heat dissipation device 300 includes a fan 400 and a baffle 500. The baffle 500 is located on one side of the fan 400, near the air inlet of the fan 400. The functional component 200 is located on the other side of the fan 400, near the air outlet of the fan 400. That is, the baffle 500 and the functional component 200 are located on opposite sides of the fan 400. The baffle 500 can guide the airflow to integrate the airflow direction entering the interior of the fan 400 from the air inlet, reduce the aerodynamic noise generated when turbulent airflow passes through the fan 400, and improve the effective utilization rate of airflow by the fan 400. The air integrated by the baffle 500 can enter the interior of the fan 400 from the air inlet, and then be blown towards the functional component 200 from the air outlet of the fan 400 under the action of the fan 400, thereby achieving heat dissipation for the functional component 200. For example, the central axis of the baffle coincides with the central axis of the fan.

[0042] It should be noted that, Figure 1 The purpose is merely to illustratively describe the connection relationship between the chassis 100, functional components 200, and heat dissipation device 300, and is not to specifically limit the connection positions, specific structures, or quantities of each device. Furthermore, the structures illustrated in the embodiments of this application do not constitute a specific limitation on the electronic device 1000. In other embodiments of this application, the electronic device 1000 may include... Figure 1 The number of components shown may be more or less, or some components may be combined, or some components may be separated, or different component arrangements may be made. Figure 1 The components shown can be implemented in hardware, software, or a combination of both.

[0043] Please see Figure 2 , Figure 2 yes Figure 1 The diagram shows the structure of fan 400.

[0044] The fan 400 includes a rotor 410 and a mounting bracket 420. The rotor 410 is mounted on the mounting bracket 420 and can rotate relative to the mounting bracket 420. The rotor 410 may include multiple blades 411 and a hub 412, with the multiple blades 411 fixedly connected to the hub 412. The multiple blades 411 are spaced apart around the hub 412. When the hub 412 rotates around its axis, it drives the multiple blades 411 to rotate around the axis of the hub 412, and the rotation of the multiple blades 411 can guide the air from the inlet end of the fan 400 to the outlet end of the fan 400.

[0045] The fan 400 has an optimal operating area, which is the end of the blade 411 closest to the hub 412. In this optimal operating area, the blade 411 rotates at a lower linear velocity, resulting in less resistance to airflow. Conversely, the end of the blade 411 furthest from the hub 412 rotates at a higher linear velocity, thus exerting greater resistance to airflow. During fan operation, reducing the airflow towards the end of the blade 411 furthest from the hub 412 and directing the airflow towards the optimal operating area reduces the fan's resistance to airflow, preventing turbulence caused by high resistance and thus reducing noise generated by turbulent airflow.

[0046] The deflector 500 can improve the turbulence at the front end of the fan 400, guide the airflow to the optimal working area of ​​the fan 400, thereby making the rotation of the fan 400 more stable, making the working efficiency of the fan 400 higher, reducing the energy loss of the vortex generated by the airflow collision in the high and low pressure areas of the fan 400 blades 411, and the aerodynamic noise generated by the vortex breaking.

[0047] Please refer to the following: Figure 3 , Figure 3 yes Figure 1 The diagram shows the structure of the guide vane 500.

[0048] The flow deflector 500 includes a first portion 510, a second portion 520, and a connecting portion 530. The first portion 510 surrounds the second portion 520 and is spaced apart from the second portion 520. The connecting portion 530 is fixedly connected between the first portion 510 and the second portion 520. Exemplarily, the first portion 510, the second portion 520, and the connecting portion 530 can be integrally formed to reduce the manufacturing cost of the flow deflector 500. In other embodiments, the first portion 510, the second portion 520, and the connecting portion 530 can also be assembled into an integrated structure; this application does not impose specific limitations on this.

[0049] Please see Figure 4 , Figure 4 yes Figure 3The diagram shows the structure of the first part 510 of the guide vane 500. For ease of explanation, the thickness direction of the guide vane 500 is defined as the X-axis direction.

[0050] The first part 510 is provided with a mounting through hole 511, which is located in the middle of the first part 510 and along the thickness direction of the guide plate 500. Figure 4 The mounting through-hole 511 (shown in the X-axis direction) penetrates the first portion 510. Along the X-axis, the diameter of the mounting through-hole 511 gradually decreases. Specifically, the first portion 510 also includes a first surface 5101 and a second surface 5102, which are arranged opposite to each other along the X-axis. The first surface 5101 is the surface of the first portion 510 facing the fan 400, and the second surface 5102 is the surface of the first portion 510 facing away from the fan 400. The mounting through-hole 511 may be funnel-shaped, and its diameter gradually decreases along the X-axis. The axis of the mounting through-hole 511 is parallel to the X-axis.

[0051] It is understandable that the first part 510 of the above structure can integrate the airflow. When the airflow flows from one side of the second surface 5102 through the mounting hole 511 to one side of the first surface 5101, and because the aperture of the mounting hole 511 gradually decreases from the second surface 5102 to the first surface 5101, the flow of gas will be concentrated, thereby achieving the effect of integrating the airflow.

[0052] For one possible implementation, please refer to Figure 5 , Figure 5 yes Figure 4 The diagram shows a cross-sectional view of the first part 510, wherein the cutting plane is... Figure 4 The BB surface is shown. The wall 5111 of the mounting through hole 511 can be a convex surface. The maximum included angle A between the wall 5111 of the mounting through hole 511 and the first surface 5101 can be an acute angle. The maximum included angle B between the wall 5111 of the mounting through hole 511 and the second surface 5102 can be an obtuse angle. Alternatively, the wall 5111 of the mounting through hole 511 can be tangent to the second surface 5102.

[0053] It is understandable that when the maximum angle A between the hole wall 5111 and the first surface 5101 is an acute angle, the airflow can enter the fan 400 in a concentrated state. After the airflow is integrated, it can flow to the optimal working area of ​​the blade 411, reducing the airflow flowing to the end of the blade 411 away from the hub 412, thereby reducing the resistance of the blade 411 to the airflow and further reducing the conflict between the airflow and the blade 411. This can improve the intake effect of the fan 400 while reducing the noise of the fan 400.

[0054] For another possible implementation, please refer to Figure 6 , Figure 6 yes Figure 4 Another cross-sectional view of the first part 510 is shown, wherein the cutting plane is Figure 4 The BB surface is shown. The wall 5111 of the mounting through hole 511 can also be a plane. The angle A between the wall 5111 of the mounting through hole 511 and the first surface 5101 can be an acute angle. The angle B between the wall 5111 of the mounting through hole 511 and the second surface 5102 is an obtuse angle.

[0055] For example, please refer to [the document / reference]. Figure 2 In fan 400, the diameter of the outer edge of rotor 410 can be a first diameter D1. Please refer to [further details]. Figure 4 The minimum diameter of the mounting through hole 511 can be the second diameter D2. The size of the first diameter D1 can be the same as the size of the second diameter D2.

[0056] Understandably, when the first diameter D1 is larger than the second diameter D2, the airflow integrated by the guide plate 500 can only blow onto a portion of the fan 400, and the fan 400 cannot be fully utilized, thus reducing its heat dissipation efficiency. When the first diameter D1 is smaller than the second diameter D2, the airflow integrated by the guide plate 500 will extend beyond the outer edge of the fan 400, and some airflow will collide with the mounting bracket 420, causing the airflow direction to change, resulting in turbulence in the airflow integrated by the guide plate 500. The uncontrollable airflow direction and the turbulence impacting the blades 411 cause the high-speed rotating fan 400 to generate significant noise, affecting the user experience. In one possible implementation, the first diameter D1 and the second diameter D2 are the same. Understandably, the airflow gathered by the guide plate 500 can not only blow onto the entire area of ​​the fan 400, but also prevents airflow from colliding with the mounting bracket 420 and generating noise. This improves the heat dissipation efficiency of the fan 400 while reducing its operating noise, thus providing a better user experience.

[0057] Please refer to the following: Figure 7 and Figure 8 , Figure 7 yes Figure 3 The diagram shows the structure of the second part 520 of the guide vane 500. Figure 8 yes Figure 7 The diagram shows a cross-sectional view of the second part 520 of the guide vane 500, where the cutting plane is... Figure 7 The CC plane is shown.

[0058] The second part 520 can be disc-shaped. Specifically, the second part 520 includes a first end face 521, a second end face 522, and a first annular surface 523. The first end face 521 and the second end face 522 are arranged opposite to each other, and the first annular surface 523 connects the first end face 521 and the second end face 522. The first end face 521 faces the fan 400, and the second end face 522 faces away from the fan 400. The first end face is also the leeward side of the second part, and the second end face is also the air outlet side of the second part. The angle C between the first annular surface 523 and the first end face 521 can be an obtuse angle. Specifically, the maximum angle between the first annular surface and the first end face can be an obtuse angle. The diameter of the first annular surface 523 gradually decreases along the X direction. The diameter of the first end face 521 can be the same as the diameter of the hub 412, so that the airflow integrated by the guide vane 500 is directed towards the blades 411, which is beneficial to improving the working efficiency of the fan 400. In some other embodiments, the diameter of the first annular surface 523 may also be equal along the direction from the second end face 522 to the first end face 521.

[0059] Understandably, in actual use, when the fan 400 rotates for ventilation, the gas will flow from one side of the second end face 522 through the first annular surface 523 to one side of the first end face 521. As the diameter of the first annular surface 523 gradually decreases along the direction from the second end face 522 to the first end face 521, the flow direction of the gas gradually changes as it flows along the first annular surface 523, eventually converging and blowing towards the fan 400.

[0060] Please refer to the following: Figure 7 and Figure 8 For example, the second end face 522 may include a second annular surface 5221 and a first convex surface 5222. The second annular surface 5221 is disposed around the first convex surface 5222. One end of the second annular surface 5221 away from the first convex surface 5222 may be connected to the first annular surface 523.

[0061] It is understood that the second annular surface 5221 can be a convex surface and is connected between the first annular surface 523 and the first convex surface 5222. For example, the first annular surface 523 and the first convex surface 5222 can be connected by a rounded transition of the second annular surface 5221.

[0062] Please refer to the following: Figure 3The second part 520 is installed in the mounting through hole 511 of the first part 510. The first part 510 and the second part 520 can be fixed by the connecting part 530. The axis of the mounting through hole 511 of the first part 510 can coincide with the axis of the second part 520. The second part 520 is spaced apart from the hole wall of the mounting through hole 511 and forms an annular gap 540 with the hole wall of the mounting through hole 511. Along the X-axis direction, the diameter of the mounting through hole 511 of the first part 510 gradually decreases, and the diameter of the first annular surface 523 of the second part 520 also gradually decreases. The rate of decrease in the diameter of the mounting through hole 511 is greater than the rate of decrease in the diameter of the first annular surface 523, thereby the annular gap 540 gradually narrows.

[0063] For example, the first convex surface 5222 includes a central region 2221 and an edge region 2222. The central region 2221 is planar, and the edge region 2222 is convex. The edge region 2222 surrounds the central region 2221. The first end face 521 may be flush with the first surface 5101. The central region 2221 may be flush with the second surface 5102 of the first portion 510. The thickness of the first portion 510 is the distance between the first surface 5101 and the second surface 5102. The thickness of the second portion 520 is the distance between the central portion and the first end face 521. The thickness of the first portion 510 may be the same as the thickness of the second portion 520.

[0064] In this embodiment, the connecting portion 530 of the guide plate 500 may include four connecting posts. One end of each of the four connecting posts is connected to the first portion 510, and the other end is connected to the second portion 520. The four connecting posts are evenly spaced, thereby forming a single unit between the first portion 510 and the second portion 520, facilitating the installation of the guide plate 500 on one side of the air inlet end of the fan 400. One end of each of the four connecting posts is connected to the wall of the mounting through hole 511, and the other end is connected to the circumferential surface of the second portion 520.

[0065] For example, the guide plate 500 has a central axis, the guide plate 500 is centrally symmetrical about the central axis, the axis of the mounting through hole 511 coincides with the central axis, and the axis of the second part 520 coincides with the central axis.

[0066] Please refer to the following: Figure 9 , Figure 10 and Figure 11 , Figure 9 yes Figure 1 The diagram shows the gas flow direction when the electronic device 1000 is working. Figure 10 yes Figure 3 The diagram shows the airflow direction under a 500-degree cross-sectional view of the deflector, where the cross-sectional plane is... Figure 3 The DD plane is shown. Figure 11 yes Figure 1The diagram shows a simulation of the airflow direction of the electronic device during operation.

[0067] When the heat dissipation device 300 is working, gas flows from the side of the guide plate 500 away from the fan 400 to the functional component 200 on the side of the fan 400 away from the guide plate 500. During this process, the gas first flows through the guide plate 500 and passes through the annular gap 540 between the first part 510 and the second part 520. Since the annular gap 540 gradually narrows along the direction from the second surface 5102 to the first surface 5101, the guide plate 500 rectifies the gas located on the air intake side of the fan 400, forming a converging airflow 1 before blowing it towards the fan 400. The airflow 1 converged by the guide plate blows towards the optimal operating area of ​​the fan 400, thereby reducing the airflow 1 flowing through the blades 411 away from the hub 412, reducing the resistance to the airflow 1, and improving the intake efficiency of the fan 400. The deflector plate 500 of this application integrates the turbulent flow on the side away from the fan 400, making the airflow more concentrated. This not only improves the intake efficiency of the fan 400, but also reduces the aerodynamic noise generated when the turbulent flow passes through the fan 400, thus improving the user experience.

[0068] Understandably, since the opening area of ​​the annular gap 540 on the side away from the fan 400 is larger than its opening area on the side facing the fan 400, the air intake area of ​​the guide vane 500 can be increased, thereby improving the air intake efficiency of the fan 400. Improving the air intake efficiency of the fan 400 allows more airflow 1 to flow to the functional component 200, reducing the temperature of the functional component 200 more quickly and improving the operational stability of the functional component 200.

[0069] It should be noted that in this embodiment, the mounting bracket 420 and the guide plate 500 can be connected, that is, there may be no gap between the mounting bracket 420 and the guide plate 500. Alternatively, the mounting bracket 420 and the guide plate 500 can be integrally formed, and the mounting bracket 420 and the guide plate 500 together constitute the fan frame structure.

[0070] In addition, the heat dissipation device 300 also includes sound-absorbing cotton. In one possible embodiment, the sound-absorbing cotton can be disposed between the mounting bracket 420 and the air guide plate 500, for example, attached to the surface of the mounting bracket 420 facing the air guide plate 500, and / or attached to the surface of the air guide plate 500 facing the mounting bracket 420. This not only absorbs the noise generated when the fan 400 is working, but also buffers the interaction force between the mounting bracket 420 and the air guide plate 500 when the fan 400 vibrates during operation, causing an impact between the mounting bracket 420 and the air guide plate 500, thus avoiding noise generated due to the impact between the mounting bracket 420 and the air guide plate 500, thereby reducing the operating noise of the heat dissipation device 300.

[0071] In another possible implementation, sound-absorbing cotton can also be placed on the periphery of the mounting bracket 420. This not only absorbs noise generated when the fan 400 is operating, but also buffers the interaction force between the heat dissipation device 300 and the functional component 200 of the electronic device 1000 when they are connected, reducing noise generated by collisions between them. Furthermore, the sound-absorbing cotton can be directly placed on the surface of the mounting bracket 420 and / or the air deflector 500 to absorb noise generated by the component during operation, improving the user experience.

[0072] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A heat dissipation device, characterized in that, It includes a fan and a baffle plate, the baffle plate being located at the air inlet end of the fan and positioned opposite to the fan. The fan includes a mounting bracket and a rotor. The rotor is installed inside the mounting bracket and can rotate relative to the mounting bracket. The rotor includes a hub and multiple blades. The multiple blades are fixedly connected to the hub and are arranged at intervals around the hub. The guide plate includes a first part, a second part, and a connecting part. The first part is provided with a mounting through hole, which penetrates the first part along the thickness direction of the guide plate. The diameter of the mounting through hole gradually decreases along the direction from the air inlet end to the air outlet end of the heat dissipation device. The second part is installed in the mounting through hole and is spaced apart from the hole wall of the mounting through hole. The second part includes a first annular surface and a leeward surface. The first annular surface is disposed opposite to the wall of the mounting through hole. Along the direction from the air inlet end to the air outlet end of the heat dissipation device, the diameter of the first annular surface gradually decreases. Along the thickness direction of the guide plate, the rate of decrease in the diameter of the mounting through hole is greater than the rate of decrease in the diameter of the first annular surface; The leeward surface faces the fan, the diameter of the leeward surface is the same as the diameter of the hub, the first annular surface is connected to the edge of the leeward surface, and the angle between the leeward surface and the first annular surface is an obtuse angle. The air deflector is used to direct airflow to the optimal operating area of ​​the fan, which is the end of the blade near the hub. The connecting part includes four connecting posts, which are evenly spaced apart. One end of each of the four connecting posts is connected to the first part, and the other end of each of the four connecting posts is connected to the second part.

2. The heat dissipation device according to claim 1, characterized in that, The second part also includes an air inlet surface, which is the surface of the second part facing the air inlet end of the heat dissipation device, and the air inlet surface is a convex surface.

3. The heat dissipation device according to claim 2, characterized in that, The air inlet surface includes a central area and an edge area. The central area is a plane, and the edge area is a convex surface. The edge area surrounds the central area.

4. The heat dissipation device according to any one of claims 1-3, characterized in that, The first part includes a first surface, which is the surface of the first part facing the fan, and the maximum included angle between the wall of the mounting through hole and the first surface is an acute angle.

5. The heat dissipation device according to any one of claims 1-3, characterized in that, The guide plate has a central axis, and the guide plate is centrally symmetrical about the central axis. The axis of the mounting through hole coincides with the central axis, and the axis of the second part coincides with the central axis.

6. The heat dissipation device according to claim 4, characterized in that, The diameter of the outer edge of the rotor is a first diameter, and the diameter of the opening of the mounting through hole on the first surface is a second diameter, which is equal to the first diameter.

7. An electronic device, characterized in that, It includes a functional component and a heat dissipation device as described in any one of claims 1-6, wherein the functional component is located at the air outlet end of the heat dissipation device.

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