CN1548777A - Axial flow fan - Google Patents
Axial flow fan Download PDFInfo
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- CN1548777A CN1548777A CNA031313523A CN03131352A CN1548777A CN 1548777 A CN1548777 A CN 1548777A CN A031313523 A CNA031313523 A CN A031313523A CN 03131352 A CN03131352 A CN 03131352A CN 1548777 A CN1548777 A CN 1548777A
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- hub portion
- axial flow
- flow fan
- blade
- face
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Abstract
The axial flow fan includes one hub and several vanes. The hub possesses one upper surface and one side surface, and the vanes are set around the hub. All the vanes have their ends forming one side wind inlet region enclosing the axial flow fan over the hub and one side wind inlet plane of the axial flow fan. One part of the end is fixed to the side surface of the hub.
Description
Technical field
The present invention relates to a kind of fan, particularly a kind of axial flow fan, its additional effect that side direction guiding air flows is arranged.
Background technique
The function of fan mainly is the purpose that guides air flows and then reach heat radiation, and is therefore good for making radiating efficiency, and fan must be good for the guiding usefulness of air.General existing fan is broadly divided into axial flow (axial flow type) and centrifugal (centrifugal type) two classes.Wherein, axial flow fan utilizes the rotation of electric fan (impeller) to guide air, and air is discharged by parallel the entering of blade center direct-axis.Since axial flow fan simple in structure, manufacture cost is lower and discharge quantity of fan is bigger, so be widely used for the device as various air-conditionings or heat radiation, the radiation fan in the computer system for example.Yet, because the discharge quantity of fan of axial flow fan can be restricted under the bigger situation of system impedance, and the have stall easily risk of (stall), so axial flow fan is confined to use in the lower system of system impedance mostly.
Please refer to Fig. 1, the longitudinal axis is represented the static pressure (static pressure) of fan, and transverse axis is represented air mass flow (air flow), the characteristic curve A and a system impedance curve (the System Resistance Curve of an existing axial flow fan; SRC) the C OP that intersects at a point, the operating point of expression fan under this system impedance condition, this moment, air mass flow was Q
Op, static pressure is P
OpOn the other hand, when acquiring a certain degree owing to rotation speed of the fan, air can produce boundary layer separation at blade surface, therefore rotation speed of the fan can not obtain higher air mass flow sooner, this moment, the static pressure variation of fan was less, was called the stall of fan, shown in the DE line segment among Fig. 1.
Because axial flow fan has advantage simple in structure, with low cost and that air quantity is bigger, therefore on engineering is used, certain significance is arranged.Yet, in the improvement of the stall problem of above-mentioned axial flow fan, except setting about, do not have other comparatively simple and easy and effective solution to occur from angle, length and the number of flabellum blade.
Please refer to Fig. 2, an axial flow fan 1 mainly comprises a framework (frame) 11, a hub portion 12, blade 13 and stator seat (not shown).One end face 131 of blade 13 is fixedly arranged on the side surface 121 of hub portion 12.When fan rotated, the air that blade 13 just can guide blades 13 tops made the air of blade 13 tops flow to blade 13 belows along the direction of the rotatingshaft (not shown) of fan.Yet, in this axial flow fan 1, because the configuration height of hub portion 12 is almost concordant with framework 11, so the air directly over the hub portion 12 and can't be entirely blade 13 and guide and form an inactive area.
For this reason, the present invention proposes a kind of improved axial flow fan, and this axial flow fan can use the air directly over the hub portion, and then improves the usefulness of fan.
Summary of the invention
As previously mentioned, with regard to an existing axial flow fan,, make the air of flabellum hub portion top can't obtain guiding and form an inactive area because flabellum hub portion is almost concordant with the height of fan frame.So the present invention proposes a kind of improved fan, this fan can use the air directly over the flabellum hub portion.
Therefore, a purpose of the present invention is to propose a kind of axial flow fan, and its flabellum hub portion is through improving, thus, air directly over the flabellum hub portion can obtain side direction guiding because of action of centrifugal force, and then the problem that air can't obtain to guide directly over the flabellum hub portion of the existing fan of solution.
Another object of the present invention is to propose a kind of axial flow fan, its flabellum hub portion thus, can improve the existing intrinsic stall phenomenon of axial flow fan through improving, and then improve the usefulness of fan widely, make this fan structure in the system impedance condition with higher, to use.
According to a kind of axial flow fan of the present invention, comprise: a hub portion has a upper surface and a side surface; And a plurality of blades, be located on this side surface of this hub portion; It is characterized in that: this upper surface top of this hub portion is surrounded out a side direction inlet air district of this axial flow fan by an end face of all blades; This end face of all blades constitutes a side direction inlet air face of this axial flow fan on every side in this side direction inlet air district; The some of this end face is fixed on this side surface of this hub portion
According to embodiments of the invention 1, the axial flow fan that provides, it includes a hub portion and a plurality of blade.This hub portion has a upper surface and a side surface, and this blade ring is located on this side surface of this hub portion.Wherein, surrounded out a side direction inlet air district of this axial flow fan above this upper surface of this hub portion by an end face of all these blades, and this end face of all these blades constitutes a side direction inlet air face of this axial flow fan on every side in this side direction inlet air district.The some of this end face is fixed on this side surface of this hub portion.
According to embodiments of the invention 2, the axial flow fan that provides, it comprises a hub portion, a plurality of blade and a framework.Hub portion has a upper surface and a side surface, and a plurality of blade ring is located on this side surface of this hub portion.Framework has at the bottom of the upper ledge and at the bottom of the lower frame, in order to ccontaining this hub portion and this blade.Wherein, the space that existence one is surrounded by a leaf margin of this blade between this upper surface of the upper frame of this framework and this hub portion, the enveloping surface that this leaf margin of all these blades is constituted on every side in this space is in order to the air in this space of side direction guide.
In axial flow fan proposed by the invention, the some of an end face of all blades and the side surface of hub portion are affixed, and another partly then surrounds out a space above a upper surface of hub portion.Air on this space can laterally be directed to the other blade of side because of centrifugal action, and then improve fan usefulness in fan running.Preferably, the top of fixing position during less than 3/4 times of whole fan frame height, can obtain more excellent side direction inlet air effect apart from the height of fan frame bottom.
According to the hub portion of axial flow fan proposed by the invention and the connection relationship between the blade multiple variation can be arranged.For example, but the top essence of hub portion and the fixing position of blade is concordant with hub portion side surface upper limb, or is lower than hub portion side surface upper limb.Moreover, can there be a gap between vane end faces and the hub portion side surface.Again, vane end faces can directly upwards be extended according to different amount from the fixing position top, perhaps outwards upwards extends according to different amount more earlier from the fixing position top.
Advantage according to axial flow fan provided by the present invention is: air mass flow that can guide when the first, improving fan running and the static pressure that can bear; The second, widely improve the stall effect that existing fan is taken place in the running, and then improve the fan overall efficiency; Three, save the manufacture cost (portion highly reduces because of hub) of fan and the complexity of simplified design.
Description of drawings
Fig. 1 is a plotted curve, shows the static pressure of existing axial flow fan and the relation of air mass flow;
Fig. 2 is a stereogram, shows an existing axial flow fan;
Fig. 3 is a stereogram, shows the axial flow fan according to one embodiment of the invention;
Fig. 4 is a schematic representation, shows the part section according to the axial flow fan of one embodiment of the invention;
Fig. 5 is a plotted curve, shows axial flow fan and static pressure and the air mass flow relation of an existing axial flow fan under same operating condition according to one embodiment of the invention;
Fig. 6 (A) is a schematic representation to 6 (J), and demonstration is according to the part section of of the present invention ten kinds of vicissitudinous embodiments' axial flow fan; And
Fig. 7 (A) is a schematic representation to 7 (B), and demonstration is according to the part section of two kinds of vicissitudinous embodiments' axial flow fan in addition of the present invention.
Embodiment
Please refer to Fig. 3 and Fig. 4, it is respectively the three-dimensional view and the constructed profile map of the axial flow fan 2 that provides according to one embodiment of the invention.As shown in Figures 3 and 4, include the flabellum hub portion 22 that a fan frame 21, is cylinder type, a blade 23 and the stator seat 24 on several side surfaces 221 that are fixed in hub portion 22 according to the axial flow fan 2 that embodiments of the invention provided.One end face 231 of the blade 23 of the axial flow fan 2 of present embodiment is lower than the top B of vane end faces 231 with the fixing position top A of a side surface 221 of hub portion 22, that is, blade 23 end faces 231 only part are fixed on the side surface 221 of hub portion 22.Like this, the superjacent air space of hub portion upper surface 222 is surrounded by blade 23 end faces 231, and the besieged zone of living 224 shown in Fig. 4 dotted line, as a side direction inlet air district of axial flow fan, and the enveloping surface that end face 231 is constituted is a side direction inlet air face.
Therefore, in the time of fan running, the air-flow (as shown by arrows) in the side direction inlet air district 224 just can be directed to the other blade 23 of side along end face 231 because of the relation of centrifugal action, and then is discharged from top to bottom by blade 23.In other words, the air of hub portion 22 tops sees through the side direction inlet air face that end face 231 constituted of blade 23 and imports, and is utilized by fan.At length depict the connection relationship between flabellum hub portion 22, blade 23, framework 21 and the stator seat 24 among Fig. 4, and the inlet air situation of hub portion top air.Experiment showed, at the bottom of fixing position top A when the end face 231 of blade 23 and the side surface 221 of hub portion 22 is apart from the framework lower frame 212 height H
2Less than whole fan frame height H
13/4 times (perhaps, the fixing position top A of the end face 231 of blade 23 and the side surface 221 of hub portion 22 apart from the framework upper ledge at the bottom of 211 height H
3Be at least whole fan frame height H
11/4 times) time, can obtain preferable side direction inlet air effect.
On the other hand, in the present embodiment, end face 231 is a curved surface, and the end face 231 of blade 23 is concordant with the upper limb of the side surface 221 of hub portion 22 with the fixing position top A essence of the side surface 221 of hub portion 22, the upper surface 222 of hub portion 22 is planes, and side surface 221 is arc surfaces.
See also table 1, its axial flow fan and one that is according to the abovementioned embodiments of the present invention and is provided has axial flow fan now, the laboratory data of the static pressure that is obtained size and air mass flow under the identical operations condition.Can further know according to these data and to depict static pressure-volume of air flow rate graph of a relation, as shown in Figure 5.Among Fig. 5, can obviously find out under the identical operations condition, be improved for fan static pressure and air quantity in the running according to axial flow fan provided by the present invention, and the influence that stall caused is compensated to some extent.
Table 1
| State | Existing axial flow fan | The axial flow fan of one embodiment of the invention | ||
| Rotating speed (R.P.M) | ????4000 | ????4000 | ||
| Electric power (V, I) | ????48V，0.50A | ????48V，0.50A | ||
| The test group | Static pressure (mmH 2O) | Air rate (CMM) | Static pressure (mmH 2O) | Air rate (CMM) |
| ????1 | ????0 | ????5.38 | ????0 | ????5.85 |
| ????2 | ????4.75 | ????4.64 | ????5.39 | ????5.05 |
| ????3 | ????9.17 | ????3.98 | ????9 | ????4.34 |
| ????4 | ????9.93 | ????3.28 | ????12.19 | ????3.55 |
| ????5 | ????9.93 | ????2.65 | ????12.79 | ????2.92 |
| ????6 | ????12.51 | ????2.06 | ????14.21 | ????2.26 |
| ????7 | ????14.59 | ????1.32 | ????16.03 | ????1.35 |
| ????8 | ????16.26 | ????0.81 | ????18.01 | ????0.87 |
| ????9 | ????17.78 | ????0 | ????21.14 | ????0 |
More than, only be used for specifying notion of the present invention according to the axial flow fan that the above embodiment of the present invention proposed, but not be used for limiting notion of the present invention.For example, according to the hub portion of axial flow fan proposed by the invention and the connection relationship between the blade multiple variation can be arranged.
Fig. 6 A～6J is the constructed profile map according to connection relationship between the flabellum hub portion 22 of axial flow fan of the present invention and the flabellum blade 23a～23j, wherein hub portion 22 is cylinder type, its upper surface is a plane, and its side surface is an arc surface, and is identical with hub portion shown in Figure 3.On the other hand, the height H on the fixing position top of hub portion 22 and end face 231a
aHeight H with blade 23a～23j
bAll less than the height (not shown) of whole fan frame, and H
bGreater than H
a
As shown in Figure 6A, the fixing position top essence of hub portion 22 and blade 23a is concordant with the upper limb of hub portion side surface 221, the end face 231a of blade 23a directly upwards forms from the fixing position top, so end face 231a surrounds out a side direction inlet air district with cylindrical body profile above hub portion 22.
Shown in Fig. 6 B, the fixing position top essence of hub portion 22 and blade 23b is concordant with the upper limb of hub portion side surface 221, the end face 231b of blade 23b is outwards straight more earlier from the fixing position top upwards to be formed, therefore end face 231b surrounds out a side direction inlet air district with cylindrical body profile above hub portion 22, and it is bigger than the side direction inlet air district among Fig. 6 A.
Shown in Fig. 6 C, the fixing position top essence of hub portion 22 and blade 23c is lower than the upper limb of hub portion side surface 221, and the end face 231c of blade 23c is outwards straight more earlier from the fixing position top upwards to be formed, cause between end face 231c and the hub portion side surface 221 to have a gap M1, this moment, end face 231c surrounded out a side direction inlet air district with cylindrical body profile above hub portion 22.
Shown in Fig. 6 D, the fixing position top essence of hub portion 22 and blade 23d is concordant with the upper limb of hub portion side surface 221, and the end face 231d of blade 23d forms obliquely from the fixing position top, so end face 231d surrounds out a side direction inlet air district with taper profile above hub portion 22.
Shown in Fig. 6 E, the fixing position top essence of hub portion 22 and blade 23e is concordant with the upper limb of hub portion side surface 221, and the end face 231e of blade 23e outwards forms earlier more obliquely from the fixing position top, so end face 231e surrounds out a side direction inlet air district with taper profile above hub portion 22.
Shown in Fig. 6 F, the fixing position top essence of hub portion 22 and blade 23f is lower than the upper limb of hub portion side surface 221, and the end face 231f of blade 23f outwards forms earlier more obliquely from the fixing position top, cause to have a gap M2 between end face 231f and the hub portion side surface 221, this moment, end face 231f surrounded out a side direction inlet air district with taper profile above hub portion 22.
Shown in Fig. 6 G, the fixing position top essence of hub portion 22 and blade 23g is lower than the upper limb of hub portion side surface 221, the end face 231g of blade 23g forms obliquely from the fixing position top, have a gap M3 between end face 231g and the hub portion side surface 221, so end face 231g surrounds out a side direction inlet air district with taper profile above hub portion 22.
Shown in Fig. 6 H, the fixing position top essence of hub portion 22 and blade 23h is concordant with the upper limb of hub portion side surface 221, and the end face 231h of blade 23h forms inwardly obliquely from fixing position, and this moment, end face 231h surrounded out a side direction inlet air district with taper profile above hub portion 22.
Shown in Fig. 6 I, the fixing position top essence of hub portion 22 and blade 23i is concordant with the upper limb of hub portion side surface, and the end face 231i of blade 23i outwards forms earlier more inwardly obliquely from the fixing position top, and this moment, end face 231i surrounded out a side direction inlet air district with taper profile above hub portion 22.
Shown in Fig. 6 J, the top essence of the fixing position of hub portion 22 and blade 23j is lower than the upper limb of hub portion side surface 221, and the end face 231j of blade 23j outwards forms earlier more inwardly obliquely from the fixing position top, and have a gap M4 between side surface 221 and the end face 231j, so end face 231j surrounds out a side direction inlet air district with taper profile above hub portion 22.
It should be noted that in the axial flow fan shown in Fig. 6 A to Fig. 6 J angle (as the θ of Fig. 6 D) folded between vane end faces 231a～231j and hub portion 22 upper surfaces can be any suitable angle.
On the other hand, as long as the height H on the fixing position top of hub portion 22 and end face 231a
aHeight H with blade 23a～23j
bAll less than the height (not shown) of whole fan frame, and H
bGreater than H
a, then the upper surface of hub portion is not limited to the plane, and can be curved surface, the 22a of hub portion shown in Fig. 7 A, and in the case, this curved surface does not hinder the side direction inlet air effect of hub portion top air.In addition, shown in Fig. 7 B, can also be curved surface according to the end face 231k of the blade 23k of axial flow fan proposed by the invention, and be not limited only to the plane.
To sum up, the present invention encyclopaedizes by the above embodiments and vicissitudinous embodiment.Yet, those skilled in the art should understand, the present invention only is exemplary but not for restricted in this all embodiments, that is, do not breaking away within connotation of the present invention and the scope, above the axial flow fan addressed other vicissitudinous embodiment and revise example and be the present invention and contain.Therefore, the present invention is defined by appending claims.
Claims (10)
1. axial flow fan comprises:
One hub portion has a upper surface and a side surface; And
A plurality of blades are located on this side surface of this hub portion;
It is characterized in that: this upper surface top of this hub portion is surrounded out a side direction inlet air district of this axial flow fan by an end face of all blades; This end face of all blades constitutes a side direction inlet air face of this axial flow fan on every side in this side direction inlet air district; The some of this end face is fixed on this side surface of this hub portion.
2. according to the axial flow fan of claim 1, it is characterized in that: the top of this part on this side surface that is fixed in this hub portion of this blade is concordant with the upper limb of this side surface of this hub portion.
3. according to the axial flow fan of claim 1, it is characterized in that: the top of this part on this side surface that is fixed in this hub portion of this blade is lower than the upper limb of this side surface of this hub portion.
4. according to the axial flow fan of claim 3, it is characterized in that: have a gap between this end face of this blade and this side surface of this hub portion.
5. according to the axial flow fan of claim 1, it is characterized in that: this end face of this blade is plane or curved surface.
6. according to the axial flow fan of claim 1, it is characterized in that: this side direction inlet air district is cylinder type or tapered.
7. according to the axial flow fan of claim 1, it is characterized in that: this upper surface of this hub portion is plane or curved surface.
8. according to the axial flow fan of claim 1, it is characterized in that: this side surface of this hub portion is an arc surface.
9. according to the axial flow fan of claim 1, also comprise a framework, have at the bottom of the upper ledge and at the bottom of the lower frame, in order to ccontaining this hub portion and this blade, it is characterized in that: this side direction inlet air district is between at the bottom of the upper ledge of this framework and between this upper surface of this hub portion.
10. according to the axial flow fan of claim 9, it is characterized in that: the perpendicular distance at the bottom of the top of this part on this side surface that is fixed in this hub portion of this blade and the lower frame of this framework is at least 3/4 times of this frame height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031313523A CN1314901C (en) | 2003-05-14 | 2003-05-14 | Axial flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031313523A CN1314901C (en) | 2003-05-14 | 2003-05-14 | Axial flow fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1548777A true CN1548777A (en) | 2004-11-24 |
| CN1314901C CN1314901C (en) | 2007-05-09 |
Family
ID=34322847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031313523A Ceased CN1314901C (en) | 2003-05-14 | 2003-05-14 | Axial flow fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1314901C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278324A (en) * | 2007-04-17 | 2011-12-14 | 索尼株式会社 | Axial fan apparatus and electronic apparatus |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG48931A1 (en) * | 1994-02-16 | 1998-05-18 | Mitsubishi Electric Corp | Blower |
| JP3491342B2 (en) * | 1994-06-27 | 2004-01-26 | 松下電工株式会社 | Axial fan |
| JPH08303395A (en) * | 1995-03-10 | 1996-11-19 | Japan Servo Co Ltd | Axial flow fan |
| JPH0960942A (en) * | 1995-08-25 | 1997-03-04 | Mitsubishi Electric Corp | Blower |
| JP3913334B2 (en) * | 1996-11-20 | 2007-05-09 | 三菱電機株式会社 | Ventilation blower and ventilation blower system |
| US6544010B1 (en) * | 2000-06-09 | 2003-04-08 | Lg Electronics Co., Ltd. | Axial flow fan with brushless direct current motor |
| JP4120228B2 (en) * | 2001-02-07 | 2008-07-16 | 株式会社デンソー | Axial flow fan for vehicles |
| JP2002242887A (en) * | 2001-02-19 | 2002-08-28 | Japan Servo Co Ltd | Axial fan |
-
2003
- 2003-05-14 CN CNB031313523A patent/CN1314901C/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278324A (en) * | 2007-04-17 | 2011-12-14 | 索尼株式会社 | Axial fan apparatus and electronic apparatus |
| CN102278324B (en) * | 2007-04-17 | 2015-08-19 | 索尼株式会社 | Axial-flow fan apparatus and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1314901C (en) | 2007-05-09 |
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| C14 | Grant of patent or utility model | ||
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Decision date of declaring invalidation: 20120718 Decision number of declaring invalidation: 18920 Granted publication date: 20070509 |