Centrifugal fan

Abstract

The invention discloses a centrifugal fan which comprises a shell, an air inlet, an air outlet, a fan blade and a fan blade. An inner cavity is formed in the shell, and the air inlet and the air outlet communicate with the inner cavity and the outside. The fan wheel is rotationally combined in the inner cavity of the shell and comprises a hub and a plurality of main blades formed by outwards diverging and extending the outer periphery of the hub; the hub directly faces the air inlet, and the auxiliary blade group is arranged on the surface, close to the air inlet, of the hub and comprises a plurality of auxiliary blades; each auxiliary blade is provided with a first end and a second end, the first end is located at the position close to the axis in the radial direction of the hub, and the second end is located at the position away from the axis in the radial direction of the hub; a flow channel is formed between any two adjacent auxiliary blades in the axial direction of the hub, and the width of the flow channel in the circumferential direction of the hub is gradually increased from the first end to the second end. The air volume and the air pressure can be effectively improved, and the air driving and heat dissipation performance of the centrifugal fan is enhanced.

Description

Technical Field

[0001] The present application relates to a centrifugal fan. Background Art

[0002] When the components of electronic devices are working, they generate heat. Usually, a fan can be set inside the electronic device to accelerate the air flow inside the electronic device, so as to dissipate the heat of the electronic device in time. At present, the overall wind pressure and air volume of the fan are small, and the heat dissipation effect is poor. Summary of the invention

[0003] The purpose of the present application is to provide a new centrifugal fan that can effectively increase the air volume and air pressure and enhance the wind-dissipating and heat-dissipating performance of the centrifugal fan.

[0004] To achieve the above objectives, this application adopts the following technical solutions: A centrifugal fan, comprising: The housing is formed with an internal cavity, and is formed with an air inlet and an air outlet connecting the internal cavity with the outside; The impeller is rotatably coupled to the inner cavity of the shell, and comprises a hub and a plurality of main blades extending outward from the outer periphery of the hub; The wheel hub is directly facing the air inlet, and further comprises: An auxiliary blade group, arranged on the surface of the hub close to the air inlet, comprising a plurality of auxiliary blades; Each of the auxiliary blades is formed with a first end and a second end, wherein the first end is located at a position close to the axis along the radial direction of the hub, and the second end is located at a position far away from the axis along the radial direction of the hub; A flow channel is formed between any two auxiliary blades adjacent to each other along the axial direction of the hub, and the width of the flow channel along the circumferential direction of the hub gradually increases from the first end to the second end.

[0005] To achieve the above purpose, this application also adopts the following technical solutions: A centrifugal fan, comprising: The housing is formed with an internal cavity, and is formed with an air inlet and an air outlet connecting the internal cavity with the outside; A fan wheel is rotatably coupled to the inner cavity of the shell, and comprises a hub and a plurality of blades extending outward from the outer periphery of the hub; The hub is directly opposite to the air inlet, and further comprises: An auxiliary blade group, arranged on the surface of the hub close to the air inlet, comprising a plurality of auxiliary blades; The plurality of auxiliary blades are arranged on the surface of the hub near the air inlet in a form extending outwardly from the axis of the hub; A flow channel is formed between any two adjacent auxiliary blades along the circumferential direction of the hub, and the width of the flow channel along the circumferential direction of the hub gradually increases from one end close to the axis of the hub to the other end.

[0006] Furthermore, each of the auxiliary blades is perpendicular to a surface of the hub close to the air inlet.

[0007] Furthermore, each of the auxiliary blades does not extend beyond the outer peripheral edge of the hub along the radial direction of the hub.

[0008] Furthermore, the extension path of each auxiliary blade along the radial direction of the hub is in a straight line, a curve or an arc.

[0009] Further, the total number of the auxiliary blades is less than the total number of the main blades.

[0010] Furthermore, the total number of the auxiliary blades is no more than one tenth of the total number of the main blades.

[0011] Furthermore, one end of each auxiliary blade close to the axis of the hub is integrally connected to form a central axis portion, and the central axis portion is located on the axis of the hub.

[0012] Furthermore, the housing includes a bottom plate, a top plate arranged opposite to the bottom plate, and a side plate connected and arranged around the bottom plate; The air inlet is formed through the top plate and connects the internal cavity with the outside along the axial direction of the hub; The air outlet is formed between the bottom plate and the top plate and connects the internal cavity with the outside along the radial direction of the hub; An edge of one end of each auxiliary blade away from the hub along the axial direction of the hub does not protrude from the air outlet.

[0013] Furthermore, in the axial direction of the hub, the end where the top plate is located is the upper end, and the end where the bottom plate is located is the lower end; The upper surface of the hub is lower than the lower surface of the top plate; The upper edge of one end of each main blade connected to the hub is lower than the upper surface of the hub; The upper edge of one end of each main blade away from the hub is higher than the upper surface of the hub and lower than the lower surface of the top plate; The upper edge of each auxiliary blade is flush with the upper edge of the main blade at one end away from the hub.

[0014] The beneficial effect of the present application is that it can effectively increase the air volume and air pressure, and enhance the wind-dissipating and heat-dissipating performance of the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present application will be further described below in conjunction with drawings and embodiments.

[0016] Figure 1 It is a three-dimensional schematic diagram of the centrifugal fan of the present application.

[0017] Figure 2 It is a top view of the centrifugal fan of the present application.

[0018] Figure 3 yes Figure 1 A partial exploded perspective view of a centrifugal fan is shown in FIG.

[0019] Figure 4 This is a top view of the centrifugal fan of the present application with the top plate removed.

[0020] Figure 5 It is a side view of the centrifugal fan of the present application, specifically a perspective looking inward from the air outlet direction along the radial direction of the fan wheel.

[0021] 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.

[0022] In order to illustrate the technical solution described in this application, a specific embodiment is provided below for illustration.

[0023] Please refer to Figures 1 to 5 As shown, a centrifugal fan disclosed in the present application mainly includes a shell 1, a fan wheel 2 rotatably assembled in the shell 1, and a stator assembly (not numbered), wherein the stator assembly and the fan wheel can generate magnetic coupling to drive the fan wheel 2 to rotate inside the shell 1. Specifically, the shell 1 includes a bottom plate 11, a top plate 12 arranged opposite to the bottom plate 11, and a side plate 13 connected and arranged around the bottom plate 11. An air inlet 101 and an air outlet 102 are formed on the shell 1. The air inlet 101 is formed through the top plate 11 and connects the internal cavity 10 with the outside world along the axial direction of the hub 20. The air outlet 102 is formed between the bottom plate 11 and the top plate 12 and connects the internal cavity 10 with the outside world along the radial direction of the hub 20.

[0024] Furthermore, the impeller 2 includes a hub 20 and a plurality of main blades 21 extending outwardly from the outer periphery of the hub 20. The hub 20 is directly opposite to the air inlet 101. Preferably, the impeller 2 is rotatably arranged directly below the air inlet 101.

[0025] In the embodiment of the present application, in the axial direction of the hub 20, the end where the top plate 12 is located is the top, and the end where the bottom plate 11 is located is the bottom. The upper surface of the hub 20 is lower than the lower surface of the top plate 12. The inside of the hub 20 is the motor structure, that is, it includes the magnet structure (not shown), the stator assembly, the rotating shaft and other components. The purpose of making the hub 20 low is to ensure that the output power meets the requirements while being lightweight, and a larger cavity can be formed above the upper surface of the low-profile hub 20, which is conducive to the air being sucked in from the air inlet 101. Specifically, the upper surface of the hub 20 is lower than the lower surface of the top plate 12. The upper edge of one end of each main blade 21 connected to the hub 20 is lower than the upper surface of the hub 20 (mainly referring to the part of the main blade 21 located directly below the air inlet 101 and close to the hub 20). The upper edge of one end of each main blade 21 away from the hub 20 is higher than the upper surface of the hub 20 and lower than the lower surface of the top plate 12 (mainly referring to the portion of the main blade 21 directly below the top plate 12 and the portion adjacent to the edge of the air inlet 101). The purpose is to increase the swept area of ​​the main blade 21 and improve the air volume and static pressure / wind pressure.

[0026] Please refer to Figures 1 to 5 In the present application, the impeller 2 is further provided with an auxiliary blade set (not numbered). In a preferred embodiment, the auxiliary blade set is provided on the surface of the hub 20 close to the air inlet 101. Figure 1 The perspective is the upper surface of the hub 20. The auxiliary blade group includes a plurality of auxiliary blades 31. Each of the auxiliary blades 31 is formed with a first end and a second end, wherein the first end is located in a radial direction of the hub 20 close to the axis of the hub 20, and the second end is located in a radial direction of the hub 20 away from the axis of the hub 20. In one embodiment, the first ends of the plurality of auxiliary blades 31 are not integrally connected, that is, the plurality of auxiliary blades 31 are independent of each other (not shown). In another embodiment, the first ends of the plurality of auxiliary blades 31 are integrally connected to form a central axis portion 310, and the central axis portion 310 is located on the axis of the hub 20 (the embodiment is shown in the attached figure). A flow channel 30 is formed between any two adjacent auxiliary blades 31 along the axial direction of the hub 20, and the width of the flow channel along the circumferential direction of the hub 20 gradually increases from the first end to the second end. The plurality of auxiliary blades 31 are arranged on the surface of the hub 20 close to the air inlet 101 in a form extending outward from the axis position of the hub 20.

[0027] In the present application, by adding auxiliary blades 31 to the upper surface of the hub 20, during the rotation of the impeller 2, the upper surface area of ​​the hub 20 can also achieve the effect of centrifugal wind driving, which can effectively improve the air volume and wind pressure of the centrifugal fan. For better effect, in a preferred embodiment, each of the auxiliary blades 31 is perpendicular to the surface of the hub 20 close to the air inlet 101. In a preferred embodiment, the height of the auxiliary blades 31 from one end to the other end (referring to the height along the axial direction of the hub 20) is equal. Each of the auxiliary blades 31 does not exceed the outer peripheral edge of the hub 20 along the radial direction of the hub 20. The extension path of each of the auxiliary blades 31 along the radial direction of the hub 20 is straight, curved or arc-shaped (the embodiment shown in the accompanying drawings is straight). In addition, too dense auxiliary blades 31 will affect the air intake. The illustrations in the accompanying drawings of this application show an example in which five auxiliary blades 31 are provided, but are not limited to five. Preferably, the total number of the auxiliary blades 31 is less than the total number of the main blades 21. In a more preferred embodiment, the total number of the auxiliary blades 31 is no more than one tenth of the total number of the main blades 21 .

[0028] Please refer to Figure 1 and Figure 3 As shown, in a preferred embodiment, each of the main blades 21 includes a root section 211 with a lower height along the axial direction of the hub 20 and an end section 212 connected to the root section 211 and with a higher height along the axial direction of the hub 20. The root section 211 is directly connected to the outer periphery of the hub 20, and the end section 212 is located outside the root section 211 along the radial direction of the hub 20. In a preferred embodiment, at least part of the outer free end of the end section 212 is located directly below the position of the top plate 12 close to the air inlet 101, and also includes a structural ring 213 of a plurality of the end sections 212, and the structural ring 213 is located directly below the position of the top plate 12 close to the air inlet 101. An upwardly open annular cavity 103 is formed above the upper edge of the root segment 211, between the inner edge of the end segment 212 and the outer edge of the auxiliary blade 31, which is conducive to the inhalation of air and is also conducive to buffering the air after centrifugal drive by the auxiliary blade 31 from entering the air flow channel formed between the main blades 21 with higher density, thereby reducing the generation of turbulence. In a preferred embodiment, the upper edge of the root segment 211 is not higher than the upper surface of the hub 20.

[0029] In a preferred embodiment, the upper edge of each auxiliary blade 31 is flush with the upper edge of the main blade 21 at one end away from the hub 20. The edge of one end of each auxiliary blade 31 away from the hub 20 along the axial direction of the hub 20 does not protrude from the air outlet 102.

[0030] When in use, the impeller 2 rotates to drive air to be sucked into the internal cavity 10 from the air inlet 101, and in the process, the air is centrifugally accelerated by the main blades 21, and is pressurized in the volute flow channel formed between the impeller and the inner wall of the side plate and then blown out from the air outlet 102, ultimately achieving the effect of wind dissipation and heat dissipation. The auxiliary blades 31 are arranged to assist in wind dissipation while occupying as little of the cavity on the upper surface of the hub 20 as possible (the number and density of the auxiliary blades 31 cannot be too large), ultimately achieving the purpose of increasing the air volume and air pressure of the centrifugal fan and enhancing the wind dissipation and heat dissipation performance of the centrifugal fan.

[0031] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, 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.

[0032] 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 design methods that can be understood by those skilled in the art.

Claims

1. A centrifugal fan, comprising: A shell (1) is formed with an internal cavity (10), and is formed with an air inlet (101) and an air outlet (102) for connecting the internal cavity with the outside; A fan wheel (2) is rotatably coupled to the internal cavity (10) of the housing (1), and comprises a hub (20) and a plurality of main blades (21) extending outwardly from the outer periphery of the hub (20); The wheel hub (20) faces the air inlet (101), and is characterized by further comprising: An auxiliary blade assembly, arranged on a surface of the hub (20) close to the air inlet (101), comprising a plurality of auxiliary blades (31); Each of the auxiliary blades (31) is formed with a first end and a second end, the first end being located at a position close to the axis along the radial direction of the hub (20), and the second end being located at a position far from the axis along the radial direction of the hub (20); A flow channel (30) is formed between any two of the auxiliary blades (31) adjacent to each other in the axial direction of the hub (20), and the width of the flow channel along the circumferential direction of the hub (20) gradually increases from the first end to the second end.

2. A centrifugal fan, comprising: A shell (1) is formed with an internal cavity (10), and is formed with an air inlet (101) and an air outlet (102) for connecting the internal cavity with the outside; A fan wheel (2) is rotatably coupled to the internal cavity (10) of the housing (1), and comprises a hub (20) and a plurality of blades extending outwardly from the outer periphery of the hub (20); The wheel hub (20) faces the air inlet (101), and is characterized by further comprising: An auxiliary blade assembly, arranged on a surface of the hub (20) close to the air inlet (101), comprising a plurality of auxiliary blades (31); The plurality of auxiliary blades (31) are arranged on the surface of the hub (20) close to the air inlet (101) in a form extending outwardly from the axial position of the hub (20); A flow channel (30) is formed between any two adjacent auxiliary blades (31) along the circumferential direction of the hub (20), and the width of the flow channel along the circumferential direction of the hub (20) gradually increases from one end close to the axis of the hub (20) to the other end.

3. The centrifugal fan according to claim 1 or 2, characterized in that: Each of the auxiliary blades (31) is perpendicular to a surface of the hub (20) close to the air inlet (101).

4. The centrifugal fan according to claim 1 or 2, characterized in that: Each of the auxiliary blades (31) does not extend beyond the outer peripheral edge of the hub (20) along the radial direction of the hub (20).

5. The centrifugal fan according to claim 1 or 2, characterized in that: The extension path of each auxiliary blade (31) along the radial direction of the hub (20) is in a straight line, a curve or an arc.

6. The centrifugal fan according to claim 1 or 2, characterized in that: The total number of the auxiliary blades (31) is less than the total number of the main blades (21).

7. The centrifugal fan according to claim 6, characterized in that: The total number of the auxiliary blades (31) is no more than one tenth of the total number of the main blades (21).

8. The centrifugal fan according to claim 1 or 2, characterized in that: One end of each of the auxiliary blades (31) close to the axis of the hub (20) is integrally connected to form a central axis portion (310), and the central axis portion (310) is located on the axis of the hub (20).

9. The centrifugal fan according to claim 1 or 2, characterized in that: The housing (1) comprises a bottom plate (11), a top plate (12) arranged opposite to the bottom plate (11), and a side plate (13) connected to and surrounding the bottom plate (11); The air inlet (101) is formed through the top plate (11) and connects the internal cavity (10) with the outside along the axial direction of the hub (20); The air outlet (101) is formed between the bottom plate (11) and the top plate (12) and connects the internal cavity (10) with the outside along the radial direction of the hub (20); An edge of one end of each auxiliary blade (31) away from the hub (20) along the axial direction of the hub (20) does not protrude from the air outlet (101).

10. The centrifugal fan according to claim 9, characterized in that: In the axial direction of the wheel hub (20), the end where the top plate (12) is located is the top, and the end where the bottom plate (11) is located is the bottom; The upper surface of the wheel hub (20) is lower than the lower surface of the top plate (12); The upper edge of one end of each main blade (21) connected to the hub (20) is lower than the upper surface of the hub (20); An upper edge of one end of each main blade (21) away from the hub (20) is higher than an upper surface of the hub (20) and lower than a lower surface of the top plate (12); The upper edge of each auxiliary blade (31) is flush with the upper edge of the end of the main blade (21) away from the hub (20).

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