A centrifugal fan

Abstract

The application discloses a centrifugal fan, which comprises a shell, an internal cavity, an air inlet and an air outlet, a fan wheel, a hub, a plurality of main blades, a plurality of auxiliary blades, a first end, a second end, a flow channel and a width.

Description

TECHNICAL FIELD

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

[0002] The electronic device generates heat when the components work. Generally, a fan can be arranged in the electronic device to accelerate the air flow in the electronic device, so as to dissipate heat in time. At present, the overall wind pressure and air volume of the fan is small, and the heat dissipation effect is poor. SUMMARY

[0003] The purpose of the present application is to provide a new centrifugal fan, which can effectively improve the air volume and wind pressure, and enhance the wind dissipation performance of the centrifugal fan.

[0004] To achieve the above purpose, the present application adopts the following technical scheme:

[0005] A centrifugal fan, comprising:

[0006] A housing is formed with an internal cavity, and is formed with an air inlet and an air outlet communicating with the internal cavity and the outside;

[0007] A fan wheel is rotatably combined in the internal cavity of the housing, and comprises a hub and a plurality of main blades formed by the outer periphery of the hub extending outwardly and divergently;

[0008] The hub is opposite to the air inlet, and further comprises:

[0009] An auxiliary blade group is arranged on the surface of the hub close to the air inlet, and comprises a plurality of auxiliary blades;

[0010] Each auxiliary blade is formed with a first end and a second end, the first end is located at a position close to the axis in the radial direction of the hub, and the second end is located at a position away from the axis in the radial direction of the hub;

[0011] 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 gradually increases from the first end to the second end.

[0012] To achieve the above purpose, the present application also adopts the following technical scheme:

[0013] A centrifugal fan, comprising:

[0014] A housing is formed with an internal cavity, and is formed with an air inlet and an air outlet communicating with the internal cavity and the outside;

[0015] A fan wheel is rotatably combined in the internal cavity of the housing, and comprises a hub and a plurality of blades formed by the outer periphery of the hub extending outwardly and divergently;

[0016] The hub is opposite to the air inlet, and further comprises:

[0017] The auxiliary blade set is arranged on the surface of the hub near the air inlet, and includes a plurality of auxiliary blades.

[0018] The plurality of auxiliary blades are arranged on the surface of the hub near the air inlet in a diverging extension form from the position of the axis of the hub outward.

[0019] A flow channel is formed between any two adjacent auxiliary blades in the circumferential direction of the hub, and the width of the flow channel in the circumferential direction of the hub gradually increases from one end near the axis of the hub to the other end.

[0020] Further, each auxiliary blade is perpendicular to the surface of the hub near the air inlet.

[0021] Further, each auxiliary blade does not exceed the outer peripheral edge of the hub in the radial direction of the hub.

[0022] Further, the extension path of each auxiliary blade in the radial direction of the hub is in a straight line, a curve or an arc.

[0023] Further, the total number of the auxiliary blades is less than the total number of the main blades.

[0024] Further, the total number of the auxiliary blades is not more than one-tenth of the total number of the main blades.

[0025] Further, each auxiliary blade is integrally connected to form a central axis part near one end of the axis of the hub, and the central axis part is located on the axis of the hub.

[0026] Further, the shell includes a bottom plate, a top plate arranged opposite to the bottom plate, and a side plate connected to surround the bottom plate and the top plate;

[0027] The air inlet is formed through the top plate and communicates the internal cavity with the outside along the axial direction of the hub;

[0028] The air outlet is formed between the bottom plate and the top plate and communicates the internal cavity with the outside along the radial direction of the hub;

[0029] Each auxiliary blade does not protrude from the air inlet away from the edge of the hub in the axial direction of the hub.

[0030] Further, 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.

[0031] The upper surface of the hub is lower than the lower surface of the top plate.

[0032] The upper edge of the end of each main blade connected to the hub is lower than the upper surface of the hub.

[0033] An upper edge of each of the main blades distal to the hub is higher than an upper surface of the hub and lower than a lower surface of the top plate.

[0034] An upper edge of each of the auxiliary blades is flush with the upper edge of the main blades distal to the hub.

[0035] The application has the beneficial effect of effectively improving the air volume and air pressure, and enhancing the air driving and heat dissipating performance of the centrifugal fan. BRIEF DESCRIPTION OF DRAWINGS

[0036] The application will be further described below in conjunction with the drawings and embodiments.

[0037] Figure 1 is a perspective view of the centrifugal fan of the application.

[0038] Figure 2 is a top view of the centrifugal fan of the application.

[0039] Figure 3 is a partial exploded view of the centrifugal fan shown in Figure 1

[0040] Figure 4 is a top view of the centrifugal fan of the application with the top plate removed.

[0041] Figure 5 is a side view of the centrifugal fan of the application, specifically a view from the radial direction of the fan wheel inwardly from the air outlet. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the application more clear, the application will be further described in detail below in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0043] In order to illustrate the technical solutions described in the application, the following will be described by specific embodiments.

[0044] Please refer to Figures 1 to 5 ​As shown, the centrifugal fan disclosed in the present application mainly comprises a housing 1, a fan wheel 2 rotatably arranged in the housing 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 housing 1. Specifically, 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 around the bottom plate 11. The housing 1 is formed with an air inlet 101 and an air outlet 102. The air inlet 101 is formed through the top plate 11 and communicates the internal cavity 10 with the outside 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 communicates the internal cavity 10 with the outside along the radial direction of the hub 20.

[0045] Further, the fan wheel 2 comprises a hub 20 and a plurality of main blades 21 extending outwardly from the outer periphery of the hub 20. The hub 20 is opposite to the air inlet 101, and preferably, the fan wheel 2 is arranged to rotate directly below the air inlet 101.

[0046] 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 upper end, and the end where the bottom plate 11 is located is the lower end. The upper surface of the hub 20 is lower than the lower surface of the top plate 12, and the inside of the hub 20 is the motor structure, that is, it comprises a magnet structure (not shown), a stator assembly, a rotating shaft and other elements. The low height of the hub 20 is to ensure that the output power meets the demand while achieving lightweight, and the upper surface of the low height hub 20 can form a larger cavity above, which is conducive to air suction 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 the 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 the 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 part of the main blade 21 located directly below the top plate 12 and close to the edge of the air inlet 101), which is to increase the air sweeping area of the main blade 21 and improve the air volume and static pressure / air pressure.

[0047] Please refer to Figures 1 to 5 As shown. In the present application, the fan wheel 2 is also provided with an auxiliary blade group (not numbered), and in a preferred embodiment, the auxiliary blade group is arranged on the surface of the hub 20 close to the air inlet 101, Figure 1The view angle is the upper surface of the hub 20. The auxiliary blade set includes a plurality of auxiliary blades 31. Each auxiliary blade 31 is formed with a first end and a second end, the first end is located close to the axis of the hub 20 in the radial direction of the hub 20, and the second end is located away from the axis of the hub 20 in the radial direction 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 shaft portion 310, and the central shaft portion 310 is located on the axis of the hub 20 (the embodiment shown in the drawings). Any two adjacent auxiliary blades 31 in the axial direction of the hub 20 form a flow channel 30, and the width of the flow channel in 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 diverging manner extending outward from the axis of the hub 20.

[0048] In this application, by adding auxiliary blades 31 to the upper surface of the hub 20, the upper surface area of the hub 20 can also achieve the effect of centrifugal wind driving during the rotation of the fan wheel 2, which can effectively improve the air volume and air pressure of the centrifugal fan. In order to achieve better results, in the preferred embodiment, each auxiliary blade 31 is perpendicular to the surface of the hub 20 close to the air inlet 101. In the preferred embodiment, the height of the auxiliary blade 31 from one end to the other end (i.e. the height in the axial direction of the hub 20) is equal. Each auxiliary blade 31 does not exceed the outer peripheral edge of the hub 20 in the radial direction of the hub 20. The extension path of each auxiliary blade 31 in the radial direction of the hub 20 is linear, curved or arc-shaped (the embodiment shown in the drawings is linear). In addition, too many auxiliary blades 31 will affect the air intake. The drawings of this application show an example of five auxiliary blades 31, but it is not limited to five. Preferably, the total number of auxiliary blades 31 is less than the total number of main blades 21. In a more preferred embodiment, the total number of auxiliary blades 31 is not more than one tenth of the total number of main blades 21.

[0049] Please refer to Figure 1 and Figure 3As shown, in the preferred embodiment, each of the main blades 21 comprises a root section 211 with a relatively low height in the axial direction of the hub 20, and an end section 212 connected to the root section 211 and having a relatively high height in 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 radially located outside the root section 211. In the preferred embodiment, at least part of the outer side 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 a plurality of structural rings 213 of the end sections 212 are located directly below the position of the top plate 12 close to the air inlet 101. An upwardly open annular cavity 103 is formed between the upper end of the root section 211, the inner side edge of the end section 212, and the outer side edge of the auxiliary blade 31, which is conducive to air intake and also conducive to buffering the air driven by the auxiliary blade 31 to enter the air flow channel formed between the main blades 21 with higher density, thereby reducing the generation of turbulence. In the preferred embodiment, the upper end of the root section 211 is not higher than the upper surface of the hub 20.

[0050] In the preferred embodiment, the upper edge of each of the auxiliary blades 31 is flush with the upper edge of the end of the main blade 21 away from the hub 20. The end edge of each of the auxiliary blades 31 away from the hub 20 in the axial direction of the hub 20 does not protrude out of the air inlet 101.

[0051] In use, the fan wheel 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 accelerated by centrifugal force through the main blades 21, pressurized in the snail-shaped flow channel formed between the fan wheel and the inner wall of the side plate, and then blown out from the air outlet 102, thereby achieving the effect of driving wind and dissipating heat. The arrangement of the auxiliary blades 31 can assist in driving wind without occupying too much of the cavity on the upper surface of the hub 20 (the number and density of the auxiliary blades 31 cannot be too large), thereby ultimately achieving the purpose of improving the air volume and air pressure of the centrifugal fan and enhancing the performance of the centrifugal fan in driving wind and dissipating heat.

[0052] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the application should be defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalents of the claims are intended to be embraced therein.

[0053] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other design manners that those skilled in the art can understand.

Claims

1. A centrifugal fan, comprising: The housing (1) has an internal cavity (10). The housing (1) includes a bottom plate (11), a top plate (12) disposed opposite to the bottom plate (11), and a side plate (13) connecting and surrounding the bottom plate (11) and the top plate (12). An air inlet (101) is formed through the top plate (12) and connects the internal cavity (10) to the outside along the axial direction of the hub (20); An air outlet (102) is formed between the bottom plate (11) and the top plate (12) and connects the internal cavity (10) to the outside along the radial direction of the hub (20); The fan wheel (2) is rotatably connected to the internal cavity (10) of the housing (1), including a hub (20) and a plurality of main blades (21) extending outward from the outer periphery of the hub (20). The hub (20) is directly opposite the air inlet (101), characterized in that it further includes: An auxiliary blade assembly is disposed on the surface of the hub (20) near the air inlet (101) and includes multiple auxiliary blades (31). Each of the auxiliary blades (31) has a first end and a second end, the first end being located radially close to the axis along the hub (20), and the second end being located radially away from the axis along the hub (20). A flow channel (30) is formed between any two adjacent auxiliary blades (31) along the circumference of the hub (20), and the width of the flow channel along the circumference of the hub (20) gradually increases from the first end to the second end; 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) with a higher height along the axial direction of the hub (20) connected to the root section (211). The root section (211) is directly connected to the outer periphery of the hub (20), and the end section (212) is located radially outside the root section (211) along the hub (20). At least a portion of the outer free end of the end section (212) is located directly below the top plate (12) near the air inlet (101); An annular cavity (103) with an upward opening is formed between the upper edge of the root section (211), the inner edge of the end section (212), and the outer edge of the auxiliary blade (31). The inner diameter of the inner edge of the end section (212) is not greater than the inner diameter of the air inlet (101). The upper surface of the hub (20) connected to the auxiliary blades (31) is located between the plane of the bottom plate (11) and the plane of the top plate (12) along the axial direction of the hub (20). The edge of each auxiliary blade (31) away from the hub (20) along the axial direction of the hub (20) does not protrude from the air inlet (101), and the auxiliary blades (31) do not extend beyond the outer peripheral edge of the hub (20) along the radial direction of the hub (20).

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

3. The centrifugal fan according to claim 1, characterized in that: Each of the auxiliary blades (31) extends along the radial direction of the hub (20) in a straight line, a curve, or an arc.

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

5. The centrifugal fan according to claim 4, characterized in that: The total number of auxiliary blades (31) is no more than one-tenth of the total number of main blades (21).

6. The centrifugal fan according to claim 1, characterized in that: Each of the auxiliary blades (31) is integrally connected at one end near the axis of the hub (20) to form a central shaft (310), which is located on the axis of the hub (20).

7. The centrifugal fan according to claim 1, characterized in that: With regard to the axial direction of the hub (20), the end where the top plate (12) is located is the upper end, and the end where the bottom plate (11) is located is the lower end; The upper edge of the end of each main blade (21) connected to the hub (20) is lower than the upper surface of the hub (20); The upper edge of the 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); The upper edge of each of the auxiliary blades (31) is flush with the upper edge of the main blade (21) at the end away from the hub (20).

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