CN103452869A - Centrifugal fan with axial flow wind direction - Google Patents

Abstract

A centrifugal fan with axial flow direction comprises a centrifugal fan wheel and a cover. The centrifugal fan wheel is provided with a rotating core structure and a plurality of centrifugal fan blades arranged around the rotating core structure, the inner side of the housing is provided with an annular air guide surface, the annular air guide surface surrounds the rotating core structure and shields the centrifugal fan blades, and centrifugal airflow on the periphery of the centrifugal fan blades is converted into axial flow airflow through the annular air guide surface.

Description

Centrifugal fan with axial flow direction

technical field

The invention relates to a centrifugal fan, in particular to a centrifugal fan with an axial flow direction.

Background technique

Fans are common components in heat dissipation engineering. Common types of fans include centrifugal fans and axial fans. The channel structure of the two is: the centrifugal fan enters the air along the axial direction of the fan wheel and outputs the air along the tangential direction of its rotation; the axial flow fan enters the air along the axial direction of the fan wheel and outputs the air. The flow field characteristics of the two are: the static pressure of the centrifugal fan flow field is large, but its flow rate is small; the static pressure of the axial flow fan flow field is small, but its flow rate is large.

Corresponding to different device spaces, different types of fans need to be installed. For example, narrow and flat spaces such as portable electronic devices are suitable for installing centrifugal fans, while general computer mainframes have more room in the box and generate more heat than portable electronic devices. Axial fans.

Referring to FIG. 1 and FIG. 2 , the casing 10 of a general vehicle electronic device is more suitable for the configuration of the axial flow channel where the shaft enters and the shaft exits, so it is suitable to install an axial flow fan. The rotating area of the fan blade 21 of the axial flow fan 20 is equal to the cross-sectional area of its channel. If components are installed within this range, the flow field will be hindered. Therefore, the preferred electronic component installation position in the casing 10 is the center of the axial flow fan 20 However, generally the volume of the fan hub 22 of the axial flow fan 20 is not large, and the installation space of the electronic components in the casing 10 is limited. To achieve channel optimization, a larger axial fan 20 needs to be configured to obtain a larger fan hub 22 area; if an axial fan 20 of a general size is configured, the channel will be blocked by electronic components.

Contents of the invention

The purpose of the present invention is to provide a centrifugal fan with an axial flow direction, which guides the airflow through the casing so that the airflow enters from the central axis of the centrifugal fan and exits from the periphery of the centrifugal fan wheel along the axial direction.

To achieve the above object, the present invention provides a centrifugal fan with an axial flow direction, which includes a centrifugal fan wheel, a casing and a fixing base. The centrifugal fan wheel has a rotating core structure and a plurality of centrifugal fan blades arranged around the rotating core structure. The casing is roughly conical or cylindrical and is set outside the centrifugal fan wheel. The inner side of the casing has a ring-shaped air guide surface, which surrounds the rotating core structure and shields the centrifugal fan blades. There is an air inlet at the top. The centrifugal fan wheel is connected to the fixed seat.

Preferably, the aforementioned centrifugal fan with axial flow direction has a rotor core structure comprising a fan hub and a bottom plate, the bottom plate radially extends from the fan hub, and the centrifugal fan blades are arranged on the bottom plate.

Preferably, in the aforementioned centrifugal fan with axial flow direction, the end of each centrifugal fan blade is bent towards the normal rotation direction of the centrifugal fan wheel.

Preferably, for the aforementioned centrifugal fan with axial flow direction, an air outlet is formed between the casing and the fixing seat, and the air outlet is roughly parallel to the opening direction of the air inlet.

Preferably, in the above-mentioned centrifugal fan with axial flow direction, a shaft sleeve is vertically arranged on the fixing base to socket the rotating core structure, and the centrifugal fan wheel is connected to the fixing base through the rotating core structure.

To achieve the above object, the present invention further provides a centrifugal fan with an axial flow direction, which includes a centrifugal fan wheel and a casing. The centrifugal fan wheel has a fan hub, a bottom plate extending from the fan hub, and a plurality of centrifugal fan blades arranged on the bottom plate around the fan hub. The casing is arranged outside the centrifugal fan wheel, and the inner side of the casing has an annular air guide surface, which surrounds the fan hub and shields the centrifugal fan blades, and an air inlet is provided at the top of the casing. Wherein the end of each centrifugal fan blade extends beyond the bottom plate, and the end of each centrifugal fan blade is bent toward the forward rotation direction of the centrifugal fan wheel.

Preferably, the aforementioned centrifugal fan with axial flow direction further includes a fixing base, and the centrifugal fan wheel is connected to the fixing base.

Preferably, in the aforementioned centrifugal fan with axial flow direction, a shaft sleeve is arranged vertically on the fixing base to fit the fan hub, and the centrifugal fan wheel is connected to the fixing base through the fan hub.

Preferably, the casing of the aforementioned centrifugal fan with axial flow direction is generally conical or cylindrical, and an air outlet is formed between the bottom edge of the casing and the fixing seat.

Preferably, for the aforementioned centrifugal fan with axial flow direction, the air outlet is roughly parallel to the opening direction of the air inlet.

The centrifugal fan with axial flow direction of the present invention guides the airflow around the centrifugal fan wheel from the centrifugal direction to the axial flow direction through the annular air guide surface and the twisted centrifugal blade end. There is more space available for electronic components.

Description of drawings

Fig. 1 is a schematic diagram of an existing axial flow fan.

Fig. 2 is a schematic diagram of the working state of the existing axial flow fan.

Fig. 3 is an exploded schematic view of the centrifugal fan according to the first embodiment of the present invention.

Fig. 4 is an exploded view of the inner side of the centrifugal fan according to the first embodiment of the present invention.

Fig. 5 is a schematic diagram of the centrifugal fan wheel in the first embodiment of the present invention.

Fig. 6 is a schematic diagram of the outside of the centrifugal fan according to the first embodiment of the present invention.

Fig. 7 is an outside front view of the centrifugal fan according to the first embodiment of the present invention.

Fig. 8 is a schematic view of the inside of the centrifugal fan according to the first embodiment of the present invention.

Fig. 9 is an inside front view of the centrifugal fan according to the first embodiment of the present invention.

Fig. 10 is a sectional view along A-A of the centrifugal fan according to the first embodiment of the present invention in Fig. 8 .

Fig. 11 is an exploded view of a centrifugal fan according to a second embodiment of the present invention.

Wherein, the reference signs are explained as follows:

10 chassis

20 axial fans

21 blades

22 existing fan hub

100 centrifugal fan wheels

110 core structure

111 fan hub

112 shafts

113 bottom plate

114 holes

120 centrifugal fan blades

121 roots

122 end

200 shell

210 annular wind guide surface

220 air intake

230 static leaves

240 air outlet

300 fixed seat

301 fixed part

310 shaft sleeve

D1 forward direction

Detailed ways

Referring to FIG. 3 and FIG. 4 , the first embodiment of the present invention provides a centrifugal fan with an axial flow direction, which includes a centrifugal fan wheel 100 , a casing 200 and a fixing seat 300 .

Referring to FIG. 3 to FIG. 5 , the centrifugal fan wheel 100 includes a rotating core structure 110 and a plurality of centrifugal fan blades 120 . The rotating core structure 110 includes a fan hub 111 and a bottom plate 113. The fan hub 111 is preferably a cylindrical shell (but the present invention is not limited thereto, for example, the fan hub 111 may also be a conical shell), and the fan hub 111 is preferably a cylindrical shell. The inner side of the hub 111 has a rotating shaft 112, the rotating shaft 112 is preferably arranged along the axial direction of the fan hub 111; the centrifugal fan wheel 100 rotates along the rotating shaft 112 towards a forward rotation direction D1; Along the radial extension of the fan hub 111 (or the rotating shaft 112 ), a plurality of perforations 114 are penetratingly opened along the connection between the fan hub 111 and the bottom plate 113 , and these perforations 114 are arranged around the fan hub 111 . The centrifugal fan blades 120 are arranged on the bottom plate 113 around the rotating shaft 112. Each centrifugal fan blade 120 is preferably vertically connected to the bottom plate 113. Each centrifugal fan blade 120 includes a root portion 121 and an end 122. The root portion 121 is curved. Each centrifugal blade 120 is preferably connected to the bottom plate 113 through a root 121 , and the end 122 extends outward from the root 121 away from the shaft 112 , and preferably the end 122 of each centrifugal blade 120 is twisted toward the normal rotation of the centrifugal fan wheel 100 The direction D1 bends and extends beyond the outer edge of the bottom plate 113 .

The foregoing is a preferred structural arrangement of the centrifugal fan wheel 100 , but the present invention is not limited thereto, and the centrifugal fan wheel 100 may also only include a fan hub 111 and a plurality of centrifugal fan blades 120 . The root portion 121 of each centrifugal fan blade 120 is connected to the fan hub 111 , and the tip 122 of each centrifugal fan blade 120 extends outward from the root portion 121 away from the rotating shaft 112 .

Referring to Fig. 6 to Fig. 8, the casing 200 is preferably in the shape of a cone, which is set outside the centrifugal fan wheel 100, and has an annular air guide surface 210 inside it, and an air inlet is opened at the top of the casing 200 220. The annular air guide surface 210 is an annular conical surface and is arranged around the rotating shaft 112. The fan hub 111 is arranged in alignment with the air inlet 220. The root 121 of each centrifugal fan blade 120 is exposed to the air inlet 220. The annular air guide surface 210 shields the On the outside of the end 122 of the centrifugal blade 120 , preferably, the end 122 of the centrifugal blade 120 is tapered corresponding to the shape of the annular air guide surface 210 . A stator vane 230 is disposed on the casing 200 . The stator vane 230 protrudes inward from the outer edge of the casing 200 and is disposed inside the casing 200 , which is used to increase the static pressure of the flow field inside the casing 200 .

Referring to FIG. 8 and FIG. 9 , preferably, the fixing base 300 is flat, which is used to fix the rotating shaft 112 of the centrifugal fan wheel 100 , and the fixing base 300 is connected to the casing 200 . A plurality of fastening portions 301 extend from the outer edge of the fixing base 300 , and the fixing base 300 is fixedly connected to the housing 200 through these fixing portions 301 (for example, locked by screws, but the invention is not limited thereto). A shaft sleeve 310 is arranged vertically on the fixed seat 300 , and the centrifugal fan wheel 100 is connected to the fixed seat 300 by fitting the rotating shaft 112 onto the shaft sleeve 310 , and the centrifugal fan wheel 100 of the present invention is located between the casing 200 and the fixed seat 300 . Preferably, the area enclosed by the outer edge of the fixing seat 300 is smaller than the area enclosed by the outer edge of the bottom edge of the casing 200, and there is a gap between the bottom edge of the casing 200 and the outer edge of the fixing seat 300 to form an air outlet 240 , and the air outlet 240 is roughly parallel to the opening direction of the air inlet.

Referring to FIG. 10 , the centrifugal fan of the present invention is installed in a casing 10 . The centrifugal fan wheel 100 rotates along the rotating shaft 112 in its forward rotation direction D1 and sucks air through the air inlet 220 , and the air flows centrifugally from the fan hub 111 to the end 122 of each centrifugal fan blade 120 along the root 121 of each centrifugal fan blade 120 The air flow in the centrifugal direction is guided by the bent end 122 of the centrifugal fan blade 120 and the annular air guide surface 210 to be converted into an axial flow direction and then flows into the casing 10 through the air outlet 240 . However, the centrifugal fan of the present invention can also only guide the airflow conversion through the annular air guide surface 210 without bending the end 122 of the centrifugal fan blade 120 .

Referring to FIG. 11 , the second embodiment of the present invention provides a centrifugal fan with an axial flow direction, which includes a centrifugal fan wheel 100 , a casing 200 and a fixing seat 300 .

The centrifugal fan wheel 100 includes a rotating core structure 110 and a plurality of centrifugal fan blades 120 . The rotating core structure 110 includes a fan hub 111 and a bottom plate 113. The fan hub 111 is preferably a cylindrical shell (but the present invention is not limited thereto, for example, the fan hub 111 may also be a conical shell), and the fan hub 111 is preferably a cylindrical shell. The inner side of the hub 111 has a rotating shaft 112, and the rotating shaft 112 is preferably arranged along the axial direction of the fan hub 111; the centrifugal fan wheel 100 rotates along the rotating shaft 112 towards a forward rotation direction D1; Or the radial extension of the rotating shaft 112 ), a plurality of perforations 114 are opened along the connection between the fan hub 111 and the bottom plate 113 , and these perforations 114 are arranged around the fan hub 111 . The centrifugal fan blades 120 are arranged on the bottom plate 113 around the rotating shaft 112. Each centrifugal fan blade 120 is preferably vertically connected to the bottom plate 113. Each centrifugal fan blade 120 includes a root portion 121 and an end 122. The root portion 121 is curved. Each centrifugal blade 120 is preferably connected to the bottom plate 113 through a root 121 , and the end 122 extends outward from the root 121 away from the shaft 112 , and preferably the end 122 of each centrifugal blade 120 is twisted toward the normal rotation of the centrifugal fan wheel 100 The direction D1 bends and extends beyond the outer edge of the bottom plate 113 .

The foregoing is a preferred structural arrangement of the centrifugal fan wheel 100 , but the present invention is not limited thereto, and the centrifugal fan wheel 100 may also only include a fan hub 111 and a plurality of centrifugal fan blades 120 . The root portion 121 of each centrifugal fan blade 120 is connected to the fan hub 111 , and the tip 122 of each centrifugal fan blade 120 extends outward from the root portion 121 away from the rotating shaft 112 .

The casing 200 is a cylindrical casing, which is disposed outside the centrifugal fan wheel 100 , and has an annular wind guiding surface 210 inside, and an air inlet 220 is defined at the top of the casing 200 . The annular air guide surface 210 is an annular plane and is arranged around the rotating shaft 112. The fan hub 111 is aligned with the air inlet 220. The root 121 of each centrifugal fan blade 120 is exposed to the air inlet 220. The annular air guide surface 210 is shielded from the centrifugal fan. The outer side of the tip 122 of the fan blade 120 .

The fixing seat 300 is used for fixing the rotating shaft 112 of the centrifugal fan wheel 100 , and the fixing seat 300 is connected to the casing 200 . A plurality of leg-shaped fastening portions 301 extend from the outer edge of the fixing base 300 , and the fixing base 300 is fixedly connected to the housing 200 through these fixing portions 301 (for example, locked by screws, but the present invention is not limited thereto). A shaft sleeve 310 is arranged vertically on the fixed seat 300 , and the centrifugal fan wheel 100 is connected to the fixed seat 300 by fitting the rotating shaft 112 onto the shaft sleeve 310 , and the centrifugal fan wheel 100 of the present invention is located between the casing 200 and the fixed seat 300 . Preferably, the area enclosed by the outer edge of the fixing seat 300 is smaller than the area enclosed by the outer edge of the bottom edge of the casing 200, and there is a gap between the bottom edge of the casing 200 and the outer edge of the fixing seat 300 to form an air outlet 240 , and the air outlet 240 is roughly parallel to the opening direction of the air inlet.

In the centrifugal fan of the present invention, its main air outlet channel is on the periphery of the centrifugal fan wheel 100, and the airflow on the periphery of the centrifugal fan wheel 100 is guided by the centrifugal direction by setting the annular air guide surface 210 and bending the end 122 of the centrifugal fan blade 120. into the direction of the axial flow. Therefore, the outer periphery of the inner space of the casing 10 can be used as a heat dissipation channel, and the space inside the outer edge of the fixing seat 300 can be used for arranging electronic components without obstructing the channel. Compared with the traditional axial flow fan 20 in the prior art, the centrifugal fan of the present invention enables the inside of the casing 10 to have a larger use space, and can be applied to narrow and small installation spaces, and the air flow passage is also smoother, and there is , the centrifugal fan can also provide greater wind pressure than the existing axial flow fan 20 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Other equivalent changes using the patent spirit of the present invention all belong to the patent scope of the present invention.

Claims (10)

1. the centrifugal cutter of a tool axial flow wind direction, is characterized in that, comprises:

One centrifugal impeller, have one and turn cored structure and turn a plurality of centrifugal flabellum of cored structure spread configuration around this; And

One case, the tapered or cylindrical shape of this case covering at outside this centrifugal impeller wherein, the inboard of this case has a ring-type wind-guiding face, and this ring-type wind-guiding face turns cored structure around this and shields described centrifugal flabellum, and this case offers a suction port in top;

One fixed base, this centrifugal impeller is connected in this fixed base.

2. the centrifugal cutter of tool axial flow wind direction as claimed in claim 1, is characterized in that, this turns cored structure and comprises a fan hub and a base plate, and this base plate is from this fan hub diameter to extension, and described centrifugal flabellum is arranged on this base plate.

3. the centrifugal cutter of tool axial flow wind direction as claimed in claim 2, is characterized in that, the end of each described centrifugal flabellum is towards the forward direction bending of this centrifugal impeller.

4. the centrifugal cutter of tool axial flow wind direction as claimed in claim 1, is characterized in that, form an exhaust outlet between this case and this fixed base, and this exhaust outlet is parallel with this suction port opening direction.

5. the centrifugal cutter of tool axial flow wind direction as claimed in claim 1, is characterized in that, is vertically installed with an axle sleeve on this fixed base and turns cored structure to be socketed this, and this centrifugal impeller turns cored structure by this, is connected in this fixed base.

6. the centrifugal cutter of a tool axial flow wind direction, is characterized in that, comprises:

One centrifugal impeller, have a fan hub, a base plate and turn a plurality of centrifugal flabellum of cored structure spread configuration around this; And

One case, cover at outside this centrifugal impeller, and the inboard of this case has a ring-type wind-guiding face, and this ring-type wind-guiding face turns cored structure around this and shields described centrifugal flabellum, and this case offers a suction port in top;

Wherein the end of each described centrifugal flabellum extends beyond this base plate, and the end of each described centrifugal flabellum is to the forward direction bending of this centrifugal impeller.

7. the centrifugal cutter of tool axial flow wind direction as claimed in claim 6, is characterized in that, also comprises a fixed base, and this centrifugal impeller is connected in this fixed base.

8. the centrifugal cutter of tool axial flow wind direction as claimed in claim 7, is characterized in that, be vertically installed with an axle sleeve on this fixed base to be socketed this fan hub, and this centrifugal impeller is connected in this fixed base by this fan hub.

9. the centrifugal cutter of tool axial flow wind direction as claimed in claim 7, is characterized in that, the tapered or cylindrical shape of this case, and form an exhaust outlet between this case root edge and this fixed base.

10. the centrifugal cutter of tool axial flow wind direction as claimed in claim 9, is characterized in that, this exhaust outlet is parallel with this suction port opening direction.

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