Fan and electronic equipment

Abstract

The invention discloses a fan and electronic equipment, the fan comprises a shell, the shell is internally provided with a first cavity for accommodating a fan impeller and a second cavity for communicating the first cavity with an air outlet, and the inner wall of the shell is provided with a protruding part located at the junction of the first cavity and the second cavity; the protruding part is provided with a first wall face facing the first cavity and a second wall face facing the second cavity, a target piece used for restraining vortex generation is arranged at the included angle between the second wall face and the plane where the air outlet is located, and an airflow channel is formed between the target piece and the second wall face.

Description

Technical Field

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

[0002] Current centrifugal fans produce noticeable noise during operation, with high noise levels, which affects the user experience. Summary of the Invention

[0003] This application provides the following technical solution:

[0004] A fan includes a housing, the interior of which has a first cavity for accommodating a fan impeller and a second cavity connecting the first cavity and an air outlet. The inner wall of the housing has a protrusion located at the junction of the first cavity and the second cavity. The protrusion has a first wall surface facing the first cavity and a second wall surface facing the second cavity. A target element for suppressing eddy current generation is provided at the angle between the second wall surface and the plane where the air outlet is located. An airflow channel is formed between the target element and the second wall surface.

[0005] Optionally, in the above-mentioned fan, the end of the airflow channel away from the air outlet is the first end, and the end of the airflow channel away from the first cavity is the second end. The distance between the target component and the second wall surface at each position of the airflow channel from the first end to the second end gradually increases or satisfies the condition of equality.

[0006] Optionally, in the above-described fan, the airflow channel is formed between the first surface and the second wall of the target component, and the included angle between the first surface and the second wall is no greater than 5° in a plane that satisfies the perpendicular condition to the rotation center line of the fan impeller.

[0007] Optionally, in the above-described fan, the distance between the second wall surface corresponding to each position of the airflow channel from the first end to the second end and the target component is not less than 1 mm and not more than 2.5 mm.

[0008] Optionally, in the above-described fan, the fan has opposing first and second shell plates, the target component is located between the first and second shell plates, and there are no gaps between the target component and the first shell plate or between the target component and the second shell plate.

[0009] Optionally, in the above-described fan, either the first shell plate or the second shell plate is integrally formed with the target component.

[0010] Optionally, in the above-described fan, in a plane perpendicular to the rotation center line of the fan impeller, a first virtual circle centered on the rotation center of the fan impeller is tangent to the convex surface of the protrusion, and a second virtual circle centered on the rotation center of the fan impeller is tangent to the surface of the target component facing the first cavity. The difference between the radius of the second virtual circle and the radius of the first virtual circle is greater than zero and not greater than 5 mm; and / or,

[0011] The plane containing the air outlet is tangent to the surface of the target component on the side away from the first cavity.

[0012] Optionally, in the above-described fan, the housing has a guide surface connected to the end of the air outlet away from the target component, and a virtual plane tangent to the convex top surface of the protrusion passes through the interior of the target component, wherein the virtual plane and the guide surface satisfy the parallel condition.

[0013] Optionally, in the above-described fan, the target component is divided into a first part and a second part by the virtual plane, the first part and the protrusion are located on opposite sides of the virtual plane, and the first part has an airflow-facing curved surface that protrudes toward the airflow guide surface.

[0014] Optionally, in the above-described fan, the second part has a second surface connected to the end of the airflow channel away from the first cavity, the second surface facing the air outlet and forming an acute angle with the plane where the air outlet is located, or the second surface and the plane where the air outlet is located satisfy the coplanar condition.

[0015] An electronic device includes a housing and a fan located within the housing. The fan includes a casing, the interior of which has a first cavity for accommodating a fan impeller and a second cavity connecting the first cavity and an air outlet. The inner wall of the casing has a protrusion located at the junction of the first cavity and the second cavity. The protrusion has a first wall surface facing the first cavity and a second wall surface facing the second cavity. A target element for suppressing eddy current generation is provided at the angle between the second wall surface and the plane where the air outlet is located. An airflow channel is formed between the target element and the second wall surface. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a perspective view of a fan according to an embodiment of this application;

[0018] Figure 2 yes Figure 1 The diagram shows the fan after the first shell plate has been removed.

[0019] Figure 3 yes Figure 2 A schematic diagram of the structure shown from another perspective;

[0020] Figure 4 yes Figure 2 A schematic diagram of the structure shown from another perspective;

[0021] Figure 5 yes Figure 4 A schematic diagram of the structure shown;

[0022] Figure 6 yes Figure 1 A schematic diagram of the fan shown from another perspective;

[0023] Figure 7 yes Figure 1 A schematic diagram of the fan shown from another perspective;

[0024] Figure 8 This is a perspective view of a fan according to an embodiment of this application;

[0025] Figure 9 yes Figure 8 The diagram shows the fan after the first shell plate has been removed.

[0026] Figure 10 yes Figure 9 A schematic diagram of the structure shown from another perspective;

[0027] Figure 11 yes Figure 9 A schematic diagram of the structure shown from another perspective;

[0028] Figure 12 This is the spectrum diagram of a fan without a target component set.

[0029] Figure 13 It is a spectrum diagram of a fan with a target component.

[0030] The diagram is marked as follows:

[0031] 100, Housing; 101, Air outlet; 102, Airflow channel; 103, Guide surface; 104, Secondary outlet; 110, First shell plate; 120, Second shell plate; 130, Protrusion; 131, First wall surface; 132, Second wall surface; 200, Fan impeller; 300, Target component; 301, First surface; 302, Second surface; 303, Windward curved surface; Q1, First cavity; Q2, Second cavity. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, the references to terms such as "one embodiment," "some embodiments," "example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0034] In the description of this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0035] To dissipate heat, electronic devices such as laptops often have internal fans. For example, a centrifugal fan can be installed in the main unit of a laptop to cool heat-generating components on the motherboard (such as the CPU, GPU, and memory modules). However, traditional centrifugal fans produce noticeable noise during operation, resulting in high noise levels and affecting the user experience.

[0036] In view of this, see Figures 1-11This application provides a fan that may include a housing 100. The interior of the housing 100 may have a first cavity Q1 for accommodating a fan impeller 200 and a second cavity Q2 connecting the first cavity Q1 and the air outlet 101. The inner wall of the housing 100 may have a protrusion 130 located at the junction of the first cavity Q1 and the second cavity Q2. The protrusion 130 may have a first wall surface 131 facing the first cavity Q1 and a second wall surface 132 facing the second cavity Q2. A target element 300 for suppressing eddy current generation may be provided at the angle between the second wall surface 132 and the plane P1 where the air outlet 101 is located. An airflow channel 102 may be formed between the target element 300 and the second wall surface 132.

[0037] The fan housing 100 provides a cavity and is provided with an air outlet 101 and an air inlet communicating with the outside of the housing 100. The cavity of the housing 100 includes a first cavity Q1 and a second cavity Q2 that are interconnected. The first cavity Q1 houses the fan impeller 200. The airflow generated by the rotation of the fan impeller 200 flows from the first cavity Q1 into the second cavity Q2, and then flows out of the housing 100 from the air outlet 101. That is, when the fan is working, the air outside the housing 100 flows through the air inlet to the rotating fan impeller 200. The airflow centrifugally thrown out by the fan impeller 200 flows along the channel formed between the inner wall of the first cavity Q1 and the outer diameter of the fan impeller 200, then flows into the second cavity Q2 and flows out from the air outlet 101.

[0038] The inner wall of the housing 100 may have a protrusion 130 located at the junction of the first cavity Q1 and the second cavity Q2. The protrusion 130 serves to prevent part of the airflow from circulating. That is, the protrusion 130 is mainly used to prevent the airflow flowing from the first cavity Q1 into the second cavity Q2 from flowing back into the first cavity Q1. Therefore, the presence of the protrusion 130 allows the airflow flowing from the first cavity Q1 into the second cavity Q2 to flow out of the air outlet 101 more smoothly.

[0039] The first wall surface 131 of the protrusion 130 faces the first cavity Q1, meaning the first wall surface 131 is part of the inner wall of the first cavity Q1. The second wall surface 132 of the protrusion 130 faces the second cavity Q2, meaning the second wall surface 132 is part of the inner wall of the second cavity Q2. In a plane perpendicular to the rotation centerline of the impeller 200 (i.e., the plane where the impeller 200 rotates), the end of the second wall surface 132 near the air outlet 101 is inclined away from the centerline of the air outlet 101 relative to the end near the impeller 200. This causes the cross-sectional area of ​​the second cavity Q2 to gradually increase along the direction from the first cavity Q1 to the air outlet 101, thereby forming a diffuser section in the second cavity Q2 capable of decelerating and pressurizing the airflow. See also Figure 4 and Figure 5The end of the second wall surface 132 near the fan impeller 200 is offset from the end near the air outlet 101 towards the center line of the air outlet 101. An angle is formed between the second wall surface 132 of the protrusion 130 and the plane P1 where the air outlet 101 is located. The target element 300 is disposed at the angle between the second wall surface 132 and the plane P1 where the air outlet 101 is located, and is spaced apart from the second wall surface 132. The target element 300 can be used to suppress the generation of vortices. That is, the orthographic projection of the second wall surface 132 of the protrusion 130 onto the plane P1 where the air outlet 101 is located overlaps with the orthographic projection of the target element 300 onto the plane P1 where the air outlet 101 is located. Moreover, the target element 300 and the second wall surface 132 are spaced apart by a certain distance to form an airflow channel 102. Compared to the case where no target component 300 is set, the airflow is less likely to form vortices when it flows to the protrusion 130. Thus, through the airflow vortex disruption effect of the target component 300, intervention is directly carried out at the noise source (i.e., the vortex generation area), breaking up the periodic vortices that generate single-frequency sounds, effectively reducing the peak value of single-frequency sounds when the fan is working, improving sound quality, and thus improving the user experience. Unlike the traditional approach of using raised structures (such as protrusions or bumps on the second wall 132) on the surface of the protrusion 130 to disrupt vortices, the target component 300 of this application is not located on the surface of the protrusion 130, but rather forms an airflow channel 102 by being spaced apart from the second wall 132 of the protrusion 130. Therefore, the target component 300 of this application and the raised structures on the surface of the protrusion 130 in the conventional approach function at different locations on the fan. Moreover, compared with the conventional approach, this application, by separating the target component 300 and the second wall 132 by a certain distance to form the airflow channel 102, can utilize the airflow channel 102 to generate a certain pressure relief effect on the noise source (i.e., the vortex generation area). Thus, under the combined effect of the target component 300 and the airflow channel 102, the resulting vortex suppression effect is more significant, and the noise level of the fan during operation is relatively lower.

[0040] See Figure 12 and Figure 13 , Figure 12 This is a spectrum diagram of a fan without a target component (300), showing the test results of the control group. Figure 12 It is evident that, without the target component 300, there is very noticeable fundamental frequency noise near the 8000 Hz operating frequency. Figure 13 This is a spectrum diagram of a fan with target component 300, showing the test results of the experimental group. Figure 13 It is evident that, with the target component 300 in place, the fundamental frequency noise near the 8000 Hz operating frequency has been significantly reduced.

[0041] See Figure 1 , Figure 3 and Figure 4 The end of the airflow channel 102 furthest from the air outlet 101 is the first end, and the end of the airflow channel 102 furthest from the first cavity Q1 is the second end. When the fan is working, a portion of the airflow flowing into the protrusion 130 in the second cavity Q2 flows along the airflow channel 102 from the first end to the second end, playing a certain pressure relief role. That is, the airflow channel 102 can be understood as a pressure relief channel. In some embodiments, the airflow channel 102 can be configured such that the distance between the target member 300 and the second wall surface 132 at each position from the first end to the second end satisfies the condition of equality. That is, the airflow channel 102 is located between the first surface 301 of the target member 300 and the second wall surface 132 of the protrusion 130, and in a plane that satisfies the condition of being perpendicular to the rotation center line of the fan impeller 200, the first surface 301 of the target member 300 and the second wall surface 132 of the protrusion 130 satisfy the condition of parallelism.

[0042] Of course, in other embodiments, the first surface 301 of the target member 300 and the second wall surface 132 of the protrusion 130 can also be configured to satisfy a non-parallel condition, that is, in a plane that satisfies the condition of being perpendicular to the rotation center line of the fan impeller 200, the first surface 301 and the second wall surface 132 are not arranged parallel. In this case, in order to achieve the pressure relief function of the airflow channel 102, the airflow channel 102 can be configured such that the distance between the target member 300 and the second wall surface 132 at various positions from the first end to the second end gradually increases, that is, in a plane that satisfies the condition of being perpendicular to the rotation center line of the fan impeller 200, the airflow channel 102 gradually expands from the first end to the second end. Compared with the case where the first surface 301 and the second wall surface 132 are configured to satisfy a parallel condition, the structural design of the airflow channel 102 gradually expanding from the first end to the second end can reduce the lateral congestion of the airflow during the flow of air along the airflow channel 102, which is conducive to the smoother flow of air through the airflow channel 102.

[0043] See Figure 9 , Figure 10 and Figure 11The airflow channel 102 is formed between the first surface 301 of the target part 300 and the second wall surface 132 of the protrusion 130, that is, the first surface 301 and the second wall surface 132 can be two opposing inner walls of the airflow channel 102. In an embodiment where the first surface 301 and the second wall 132 are configured to satisfy a non-parallel condition, in a plane that satisfies a perpendicular condition to the rotation center line of the fan impeller 200, the airflow channel 102 can be configured to gradually expand from the first end to the second end. That is, in a plane that satisfies a perpendicular condition to the rotation center line of the fan impeller 200, the first surface 301 of the target member 300 is inclined relative to the second wall 132 of the protrusion 130. The distance between the end of the first surface 301 away from the fan impeller 200 and the second wall 132 is greater than the distance between the end of the first surface 301 closer to the fan impeller 200 and the second wall 132. An angle greater than 0° is formed between the first surface 301 and the second wall 132. This angle can be understood as the tilt angle of the first surface 301 relative to the second wall 132. In some embodiments, the included angle formed between the first surface 301 and the second wall surface 132 can be set to no more than 5°, for example, it can be set to 3°, so that the airflow can pass through the airflow channel 102 more quickly while the airflow channel 102 gradually expands from the first end to the second end.

[0044] See Figure 3 , Figure 4 , Figure 10 and Figure 11 The target component 300 is positioned at the angle between the plane P1 containing the second wall surface 132 and the air outlet 101, and is spaced apart from the second wall surface 132. To better utilize the target component 300's function of suppressing vortex generation, the distance between the target component 300 and the second wall surface 132 should not be too large or too small. In some embodiments, the airflow channel 102 can be configured such that the distance between the second wall surface 132 and the target component 300 at each position from the first end to the second end is not less than 1 mm and not more than 2.5 mm. Furthermore, the airflow channel 102 can be configured such that the distance between the target component 300 and the second wall surface 132 at each position from the first end to the second end satisfies the condition of equality, or it can be configured such that the distance between the target component 300 and the second wall surface 132 at each position from the first end to the second end gradually increases. For example, the distance between the target component 300 and the second wall surface 132 can be set to always be 2 mm from the first end to the second end of the airflow channel 102. For example, the distance between the target component 300 and the second wall surface 132 can be set to gradually increase from 1 mm at the first end of the airflow channel 102 to 2.5 mm at the second end of the airflow channel 102.

[0045] See Figure 1 and Figure 8The fan may have a first shell plate 110 and a second shell plate 120 opposite to each other, and the target member 300 may be located between the first shell plate 110 and the second shell plate 120. That is, the housing 100 may include a first shell plate 110 and a second shell plate 120 arranged opposite to each other along the rotation center line of the fan impeller 200, and the fan impeller 200 and the target member 300 are located in a cavity between the first shell plate 110 and the second shell plate 120. In some embodiments, the target member 300 may be configured such that there are no gaps between it and the first shell plate 110 and between it and the second shell plate 120. That is, both ends of the target member 300 along the rotation center line of the fan impeller 200 are respectively sealed to the first shell plate 110 and the second shell plate 120. This configuration prevents airflow from entering the airflow channel 102 from other locations besides the first end (i.e., the end closest to the fan impeller 200). These airflows entering the airflow channel 102 from other locations may interfere with the flow of airflow entering the airflow channel 102 from the first end. Therefore, by setting the two ends of the target component 300 to be sealed and connected to the first shell plate 110 and the second shell plate 120 respectively, the airflow can flow better along the airflow channel 102 from the first end to the second end (i.e., the end of the airflow channel 102 near the air outlet 101 of the shell 100), allowing the airflow channel 102 to better perform its pressure relief function.

[0046] To facilitate fan assembly, in some embodiments, the target component 300 can be integrally formed with either the first shell plate 110 or the second shell plate 120. That is, the target component 300 can be integrally formed with either the first shell plate 110 or the second shell plate 120. Since the target component 300 is integrally formed with either the first shell plate 110 or the second shell plate 120, the assembly of the target component 300 within the housing 100 is completed simultaneously with the assembly of the first shell plate 110 and the second shell plate 120. This not only improves the fan assembly efficiency but also makes the overall structure of the fan more stable.

[0047] In a plane perpendicular to the rotation center line of the fan impeller 200, both the target component 300 and the protrusion 130 are located outside the outer diameter of the fan impeller 200. (See also...) Figure 5A first virtual circle Y1, centered on the rotation center of the impeller 200, is tangent to the convex surface of the protrusion 130. A second virtual circle Y2, centered on the rotation center of the impeller 200, is tangent to the surface of the target component 300 facing the first cavity Q1. The diameters of both the first virtual circle Y1 and the second virtual circle Y2 are larger than the outer diameter of the impeller 200. It should be understood that the convex top of the protrusion 130 refers to the transition portion at the junction of the first wall surface 131 and the second wall surface 132, located at the top of the protrusion 130 in the protrusion direction. The size relationship between the first virtual circle Y1 and the second virtual circle Y2 has a certain influence on the vortex-suppressing effect of the target component 300. For example, in order to ensure that a portion of the airflow reaching the protrusion 130 can flow more smoothly along the airflow channel 102 between the target component 300 and the protrusion 130, the second virtual circle Y2 should be larger than the first virtual circle Y1, that is, the target component 300 is farther from the rotation center of the impeller 200 compared to the convex apex of the protrusion 130. Considering that the airflow vortex mainly originates near the convex apex of the protrusion 130, the second virtual circle Y2 should not be too large compared to the first virtual circle Y1. In some embodiments, the target component 300 can be configured to satisfy: the difference between the radius of the second virtual circle Y2 and the radius of the first virtual circle Y1 is greater than zero and not greater than 5 mm. This configuration allows the target component 300 to disperse the vortex at its source, while also enabling a portion of the airflow to flow more smoothly into the airflow channel 102. This allows the airflow channel 102 to better exert its pressure relief function. As a result, the combined effect of the target component 300 and the airflow channel 102 improves the sound quality of the fan during operation and further reduces noise impact.

[0048] See Figure 4 and Figure 11 When the fan is operating, the airflow flows from the first chamber Q1 into the second chamber Q2. Most of the airflow flows from the side of the target component 300 away from the airflow channel 102 to the air outlet 101, while a small portion flows from the airflow channel 102 to the air outlet 101. To minimize the possibility of these two airflow portions interfering with each other after passing over the target component 300, the target component 300 should not be too far from the air outlet 101. In some embodiments, the target component 300 can be configured such that the plane P1 containing the air outlet 101 is tangent to the surface of the target component 300 on the side away from the first chamber Q1. With this configuration, the airflow on the side of the target component 300 away from the airflow channel 102 can flow directly along the surface of the target component 300 to the air outlet 101, thereby reducing the influence of this portion of the airflow on the other portion of the airflow flowing out from the airflow channel 102.

[0049] See Figure 1 , Figure 3 and Figure 4The protrusion 130 can be disposed at one end of the air outlet 101. The target member 300 located at the angle between the second wall surface 132 of the protrusion 130 and the plane P1 where the air outlet 101 is located can be appropriately extended to the other end of the air outlet 101 to enhance the vortex suppression capability of the target member 300. In this structure, the target member 300 can be in the form of a block, thereby occupying more area at the angle between the second wall surface 132 of the protrusion 130 and the plane P1 where the air outlet 101 is located while forming an airflow channel 102 with the protrusion 130. In some embodiments, the housing 100 can have a guide surface 103 connected to the end of the air outlet 101 away from the target member 300. The target member 300 can be configured to satisfy the following conditions: a virtual plane P2 tangent to the convex surface of the protrusion 130 passes through the interior of the target member 300, and the virtual plane P2 and the guide surface 103 are parallel. The guide surface 103 is a flat section on the inner wall of the housing 100, located opposite the protrusion 130. The guide surface 103 extends smoothly from the air outlet 101 into the housing 100, guiding the airflow towards the air outlet 101. The virtual plane P2 is parallel to the guide surface 103 and tangent to the convex surface of the protrusion 130. The target component 300 is divided into a first part and a second part by the virtual plane P2. Specifically, a portion of the target component 300 protrudes from the virtual plane P2 on the side opposite to the protrusion 130. This portion of the target component 300 can disperse the airflow before it reaches the protrusion 130, thus more effectively suppressing the generation of eddies.

[0050] It should be noted that, in Figure 4 and Figure 11 In the exemplary embodiment, the guide surface 103 is perpendicular to the plane P1 containing the air outlet 101, therefore the virtual plane P2 is also perpendicular to the plane P1 containing the air outlet 101. In other embodiments, the guide surface 103 may not be perpendicular to the plane P1 containing the air outlet 101; for example, the guide surface 103 and the plane P1 containing the air outlet 101 may form an 80° angle, in which case the virtual plane P2 also forms an 80° angle with the plane P1 containing the air outlet 101.

[0051] See Figure 4 and Figure 11In some embodiments, the target component 300 can be divided into a first part and a second part by a virtual plane P2. The first part can be located on both sides of the protrusion 130 on the virtual plane P2, and the first part can have a windward curved surface 303 protruding from the guide flow surface 103. It is easy to understand that in a plane that satisfies the perpendicular condition to the rotation center line of the fan impeller 200, the outline of the windward curved surface 303 is curved and convex to the guide flow surface 103. With this configuration, the target component 300 can disperse the airflow while allowing the airflow to flow along a more streamlined surface, thereby making the airflow flow more smoothly and efficiently to the air outlet 101. In other words, the windward curved surface 303 of the target component 300 has an improving effect on the airflow field, which is beneficial for the fan to have a stronger air volume output capability.

[0052] See Figure 4 The target component 300 can be divided into a first part and a second part by a virtual plane P2. The second part can be located on the same side of the virtual plane P2 as the protrusion 130. In some embodiments, the second part can have a second surface 302 connected to the end of the airflow channel 102 away from the first cavity Q1 (i.e., the end away from the fan impeller 200). The second surface 302 can be configured to satisfy the coplanar condition with the plane P1 where the air outlet 101 is located. In this structure, the first surface 301 of the target component 300 for forming the airflow channel 102 extends all the way to the plane P1 where the air outlet 101 is located. Therefore, the airflow flowing along the airflow channel 102 flows out of the air outlet 101 the moment it exits the airflow channel 102. The flow direction of this part of the airflow when it exits the air outlet 101 is determined by the extension direction of the airflow channel 102, and it mainly flows to the side front of the air outlet 101. Therefore, this type of fan is suitable for applications where there are heat source components that need to be cooled in the side front of the air outlet 101.

[0053] In other embodiments, the second surface 302 of the target element 300 may be configured in other forms, for example, in Figure 11 In the exemplary embodiment shown, the second surface 302 may be configured to face the air outlet 101 and form an acute angle with the plane P1 where the air outlet 101 is located. In this structure, the first surface 301 of the target element 300 for forming the airflow channel 102 does not extend to the plane P1 where the air outlet 101 is located. The airflow flowing along the airflow channel 102 passes through a roughly triangular area after exiting the airflow channel 102 and then flows out of the air outlet 101. Therefore, this part of the airflow mainly flows in front of the air outlet 101 when it flows out of the air outlet 101.

[0054] See Figure 6 and Figure 7In some embodiments, both the first shell plate 110 and the second shell plate 120 of the housing 100 may be provided with air inlets. The air inlets on the first shell plate 110 and the air inlets on the second shell plate 120 may be the same or different. For example, a larger air inlet may be provided on the first shell plate 110 as the main air inlet, and a smaller air inlet may be provided on the second shell plate 120 as the secondary air inlet. Of course, in other embodiments, an air inlet may be provided only on one of the first shell plate 110 and the second shell plate 120, and this application does not limit this.

[0055] To allow the fan to have more airflow directions, in some embodiments, the housing 100 may be provided with a secondary outlet 104, such as... Figure 6 and Figure 7 As shown, the secondary outlet 104 and the air outlet 101 are both located between the first shell plate 110 and the second shell plate 120. The secondary outlet 104 and the air outlet 101 are arranged along the rotation direction of the fan impeller 200, that is, the secondary outlet 104 is located upstream of the air outlet 101.

[0056] This application also provides an electronic device, which may include a housing and a fan located inside the housing. The fan may include a housing 100. The interior of the housing 100 may have a first cavity Q1 for accommodating a fan impeller 200 and a second cavity Q2 connecting the first cavity Q1 and the air outlet 101. The inner wall of the housing 100 may have a protrusion 130 located at the junction of the first cavity Q1 and the second cavity Q2. The protrusion 130 may have a first wall surface 131 facing the first cavity Q1 and a second wall surface 132 facing the second cavity Q2. A target element 300 for suppressing eddy current generation may be provided at the angle between the second wall surface 132 and the plane P1 where the air outlet 101 is located. An airflow channel 102 may be formed between the target element 300 and the second wall surface 132.

[0057] Electronic devices can be of various types, such as laptops, mobile phones, tablets, and handheld game consoles, and this application does not limit them. The structure and working principle of the fan can be found in the preceding description of fans, and will not be repeated here. Since the fan disclosed in the above embodiments has the aforementioned technical effects, electronic devices having this fan also have the aforementioned technical effects, and will not be repeated here.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fan, comprising a housing, the interior of which has a first cavity for accommodating a fan impeller and a second cavity connecting the first cavity and an air outlet, the inner wall of the housing having a protrusion at the junction of the first cavity and the second cavity, the protrusion having a first wall surface facing the first cavity and a second wall surface facing the second cavity, a target element for suppressing eddy current generation being disposed at the angle between the second wall surface and the plane of the air outlet, the target element forming an airflow channel with the second wall surface.

2. The fan according to claim 1, wherein the end of the airflow channel away from the air outlet is the first end, the end of the airflow channel away from the first cavity is the second end, and the distance between the target component and the second wall surface at each position of the airflow channel from the first end to the second end gradually increases or satisfies the condition of equality.

3. The fan according to claim 2, wherein the airflow channel is formed between the first surface and the second wall surface of the target component, and the included angle between the first surface and the second wall surface is not greater than 5° in a plane that satisfies the perpendicular condition to the rotation center line of the fan impeller.

4. The fan according to claim 2, wherein the distance between the second wall surface corresponding to each position of the airflow channel from the first end to the second end and the target component is not less than 1 mm and not more than 2.5 mm.

5. The fan according to claim 1, wherein the fan has opposing first and second shell plates, the target component is located between the first and second shell plates, and there are no gaps between the target component and the first shell plate or between the target component and the second shell plate.

6. The fan according to claim 1, wherein in a plane perpendicular to the rotation center line of the fan impeller, a first virtual circle centered on the rotation center of the fan impeller is tangent to the convex surface of the protrusion, and a second virtual circle centered on the rotation center of the fan impeller is tangent to the surface of the target component facing the first cavity, wherein the difference between the radius of the second virtual circle and the radius of the first virtual circle is greater than zero and not greater than 5 mm; and / or, The plane containing the air outlet is tangent to the surface of the target component on the side away from the first cavity.

7. The fan according to any one of claims 1 to 6, wherein the housing has a guide surface connected to the end of the air outlet away from the target component, a virtual plane tangent to the convex top surface of the protrusion passes through the interior of the target component, and the virtual plane and the guide surface satisfy the parallel condition.

8. The fan according to claim 7, wherein the target component is divided into a first part and a second part by the virtual plane, the first part and the protrusion are located on opposite sides of the virtual plane, and the first part has an airflow-facing curved surface protruding toward the airflow guide surface.

9. The fan according to claim 8, wherein the second portion has a second surface connected to the end of the airflow channel away from the first cavity, the second surface facing the air outlet and forming an acute angle with the plane where the air outlet is located, or the second surface and the plane where the air outlet is located satisfy the coplanar condition.

10. An electronic device, comprising a housing and a fan located within the housing, the fan comprising a casing, the interior of the casing having a first cavity for accommodating a fan impeller and a second cavity communicating with the first cavity and an air outlet, the inner wall of the casing having a protrusion located at the junction of the first cavity and the second cavity, the protrusion having a first wall surface facing the first cavity and a second wall surface facing the second cavity, a target element for suppressing eddy current generation being disposed at the angle between the second wall surface and the plane containing the air outlet, the target element forming an airflow channel with the second wall surface.

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