CN104912846B - Draught fan impeller and its center line of blade profile approximating method, blower fan - Google Patents
Draught fan impeller and its center line of blade profile approximating method, blower fan Download PDFInfo
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- CN104912846B CN104912846B CN201510405155.8A CN201510405155A CN104912846B CN 104912846 B CN104912846 B CN 104912846B CN 201510405155 A CN201510405155 A CN 201510405155A CN 104912846 B CN104912846 B CN 104912846B
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Abstract
The invention discloses a kind of draught fan impeller and its center line of blade profile approximating method, blower fan, wherein, draught fan impeller includes：Hub disk, the blade being arranged on hub disk；Blade includes connected blade inlet section and blade exit section, blade inlet section and blade exit section are sequentially distributed along the length direction of blade, blade inlet section is close to the central axis of hub disk, and blade inlet section is airfoil structure, and blade exit section is constant circulation flow pattern structure.Draught fan impeller disclosed by the invention, blade exit section is designed as constant circulation flow pattern structure, it then ensure that meridian plane of the moment of momentum along draught fan impeller keeps constant at blade exit, so as to effectively reduce barometric gradient of the air-flow in blade exit section, inhibit air-flow at blade exit to separate, reduce the influence to the aeroperformance and noise level of blower fan.
Description
Technical field
The present invention relates to draught fan impeller technical field, intends more specifically to a kind of draught fan impeller and its center line of blade profile
Conjunction method, blower fan.
Background technology
At present, draught fan impeller mainly uses prismatic blade and circular arc airfoil blade, in order to mold processing.But in use
The blower fan of blade is stated, air-flow is easier to cause local velocity to increase in blade exit section formation Shedding Vortex, produces low-pressure area so that leaf
Piece exit is compared with larger barometric gradient is also easy to produce, and the possibility for causing exit flow to separate is larger, to the aeroperformance of blower fan
There is large effect with noise level.
In summary, how to suppress air-flow at blade exit to separate, to reduce aeroperformance and noise level to blower fan
Influence, be current those skilled in the art's urgent problem to be solved.
The content of the invention
It is an object of the invention to provide a kind of draught fan impeller, suppresses air-flow separation at blade exit, to reduce to blower fan
The influence of aeroperformance and noise level.It is a further object of the present invention to provide a kind of blower fan with above-mentioned draught fan impeller, with
A kind of and center line of blade profile approximating method of draught fan impeller.
To achieve these goals, the present invention provides following technical scheme：
A kind of draught fan impeller, including：
Hub disk, the blade being arranged on the hub disk；
Wherein, the blade includes connected blade inlet section and blade exit section, the blade inlet section and the leaf
Length direction of the piece outlet section along the blade is sequentially distributed, the blade inlet section close to the hub disk central axis, and
The blade inlet section is airfoil structure, and the blade exit section is constant circulation flow pattern structure.
Preferably, r>50%R1, wherein, one end that r is connected with the blade inlet section for the blade exit section is away from institute
State the distance of the central axis of hub disk, R1It is the one end of the blade exit section away from the blade inlet section away from the hub disk
The distance of central axis.
Preferably, the blade is straight blade.
Preferably, in the meridional projection figure of the draught fan impeller, the height of the projecting blade increases with a reduction
Greatly；Wherein, a is the distance of central axis of the blade away from the hub disk.
Preferably, in the meridional projection figure of the draught fan impeller, the top projection of the blade is first straight line section.
Preferably, 3 °<θ1<16 °, θ1First straight line section described in meridional projection figure for the draught fan impeller with it is described
The angle of the projection of hub disk.
Preferably, in the meridional projection figure of the draught fan impeller, the top projection of the blade is curved section, and described
Curved section concaves towards the projection of the hub disk.
Preferably, length direction of the flow area along the blade is definite value between the leaf of the draught fan impeller.
Preferably, in the meridional projection figure of the draught fan impeller, the blade inlet section is away from the blade exit section
End on projection be second straight line section, the second straight line Duan Ziqi away from one end that the hub disk projects to it after described
One end of disk projection tilts to the central axis of the hub disk.
Preferably, 15 °<θ2<35 °, wherein, θ2For the second straight line section and the angle of the central axis of the hub disk.
Preferably, the blade inlet section be NACA airfoil structures, single circular arc airfoil structure, biconvex aerofoil pro file structure or
Bezier airfoil structure.
Preferably, above-mentioned draught fan impeller also includes shroud, in the meridional projection of the draught fan impeller, the throwing of the shroud
The top projection of molded line and the blade is equal space line in shadow.
Preferably, the shroud and the blade are integral type structure.
Preferably, the shroud is fixed on the spiral case of the draught fan impeller, and has between the shroud and the blade
Gap.
Preferably, the gap between the shroud and the blade is 1.5-6mm.
Draught fan impeller provided by the invention, blade exit section is designed as constant circulation flow pattern structure, then ensure that blade goes out
Meridian plane of the moment of momentum along draught fan impeller keeps constant at mouthful, so as to effectively reduce pressure ladder of the air-flow in blade exit section
Degree, it is suppressed that air-flow separates at blade exit, reduces the influence to the aeroperformance and noise level of blower fan.
Meanwhile draught fan impeller provided by the invention, the blade inlet section of blade is designed as airfoil structure, by the leaf of blade
The characteristics of piece outlet section is designed as constant circulation flow pattern, then the blade has had both airfoil structure and constant circulation flow pattern structure so that should
Draught fan impeller improves the mechanical efficiency of blower fan on the premise of air-flow separation at suppression blade exit.
Based on the draught fan impeller of above-mentioned offer, present invention also offers a kind of center line of blade profile approximating method of draught fan impeller,
The center line of blade profile approximating method of the draught fan impeller, including step：
The center of circle O of the draught fan impeller is set, sets one end of central axis of the blade away from the hub disk away from institute
State the distance R of the central axis of hub disk1And the blade close to one end of the central axis of the hub disk away from the hub disk
The distance R of central axis2；
Using center of circle O as the center of circle, with R1Draw and justify for radius, form circle O1, using center of circle O as the center of circle, with R2Draw and justify for radius, shape
Into circle O2；
Set point A, and point A and center of circle O distance r；
The picture aerofoil profile bone line by point A, the aerofoil profile bone line and the round O2Point C is met at, aerofoil profile bone line AC is described
The bone line of blade inlet section；
The center of circle B of the bone line of the blade exit section is determined, using center of circle B as the center of circle, using point A to point B distance AB as half
Footpath, the picture arc by point A, the arc and circle O1It is the bone line of the blade exit section to meet at point D, camber line AD, that is, completes fitting.
Preferably, concretely comprising the following steps for center of circle B is determined：Make tangent line L of the bone line in point A of the blade inlet section1,
Point A makes tangent line L1Vertical line L2, line segment AO vertical line L is made in point O3, the vertical line L2With the vertical line L3Intersection point be institute
State center of circle B.
Preferably, concretely comprising the following steps for the center of circle B is determined：
Make tangent line L of the bone line in point A of the blade inlet section1,
Using center of circle O as the center of circle, drawn and justified as radius using r, make round O3,
Make round O3In point A tangent line L4, the tangent line L1With the tangent line L4Between angle be β, according to r, ∠ OAB
=β, the ∠ AOB=90 ° of determination center of circle B.
Preferably, r>50%R1。
Based on the draught fan impeller of above-mentioned offer, present invention also offers a kind of blower fan, the blower fan includes：Impeller, wherein, institute
Impeller is stated as the draught fan impeller described in above-mentioned any one.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is the structural representation of draught fan impeller provided in an embodiment of the present invention；
Fig. 2 is Fig. 1 A-A to sectional view；
Fig. 3 is a kind of meridional projection figure of draught fan impeller provided in an embodiment of the present invention；
Fig. 4 is the different cross section velocity profile of draught fan impeller in Fig. 3；
Fig. 5 is the meridional projection figure of another draught fan impeller provided in an embodiment of the present invention；
Fig. 6 is the meridional projection figure of another draught fan impeller provided in an embodiment of the present invention；
Fig. 7 is that the center line of blade profile of draught fan impeller provided in an embodiment of the present invention is fitted schematic diagram.
In figure 1 above -7：
1 it is blade, 11 be blade inlet section, 12 be blade exit section, 2 be hub disk, 3 is shroud.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
It refer to accompanying drawing 1-6, draught fan impeller provided in an embodiment of the present invention, including：Hub disk 2, the leaf being arranged on hub disk 2
Piece 1.Wherein, blade 1 includes connected blade inlet section 11 and blade exit section 12, blade inlet section 11 and blade exit section 12
It is sequentially distributed along the length direction of blade 1, blade inlet section 11 is close to the central axis of hub disk 2, and blade inlet section 11 is the wing
Type structure, blade exit section 12 are constant circulation flow pattern structure.
It should be noted that the structure that airfoil structure and constant circulation flow pattern structure are well known to the skilled person,
Airfoil structure and constant circulation flow pattern structure are not described herein.
Draught fan impeller provided in an embodiment of the present invention, blade exit section 12 is designed as constant circulation flow pattern structure, then ensured
Meridian plane of the exit moment of momentum of blade 1 along draught fan impeller keeps constant, so as to effectively reducing air-flow in blade exit
The barometric gradient of section 12, it is suppressed that the exit air-flow separation of blade 1, reduce the shadow of the aeroperformance and noise level to blower fan
Ring.
Meanwhile draught fan impeller provided in an embodiment of the present invention, the blade inlet section 11 of blade 1 is designed as airfoil structure,
The blade exit section 12 of blade 1 is designed as constant circulation flow pattern, then the blade 1 has had both airfoil structure and constant circulation flow pattern structure
The characteristics of so that for the draught fan impeller on the premise of the exit air-flow separation of blade 1 is suppressed, improve blower fan does effect
Rate.
It is understood that in above-mentioned draught fan impeller, blade exit section 12 and blade inlet section 11 are integral type structure.
In above-mentioned draught fan impeller, blade exit section 12 and central axis of the one end that blade inlet section 11 is connected away from hub disk 2
Distance be r, the distance of central axis of the one end of blade exit section 12 away from blade inlet section 11 away from hub disk 2 is R1.In order to
It is easy to the fitting of the bone line of blade 1 of draught fan impeller, prioritizing selection r>50%R1。
Outlet can be suppressed to ensure the suction surface of blade 1 with pressure face both sides and separate stream, prioritizing selection blade 1 for etc.
Thickness blade.It is understood that the thickness of any two position of straight blade is equal.
It is understood that blade 1 is in elongated shape in above-mentioned draught fan impeller.Above-mentioned draught fan impeller, its meridional projection
In, the height that blade 1 projects can be definite value, can also be changed with the distance of central axis of the blade 1 away from hub disk 2.Preferably,
In the meridional projection figure of draught fan impeller, the height that blade 1 projects increases with a reduction；Wherein, a is blade 1 away from hub disk
The distance of 2 central axis.So, the entrance of draught fan impeller is increase effectively, so as to increase the flow of blower fan.It is appreciated that
, a is the value of a change, refers to the distance of central axis of the optional position of blade 1 away from hub disk 2.
Meet above-mentioned requirements, in the meridional projection figure of draught fan impeller, the top projection of blade 1 can straight line, it is or bent
Line.
Preferably, in the meridional projection figure of draught fan impeller, the top projection of blade 1 is first straight line section.It is appreciated that
, the first straight line section is skew lines section.In order to increase the entrance of draught fan impeller, 3 ° of prioritizing selection to greatest extent<θ1<
16 °, wherein, θ1For the angle of first straight line section in the meridional projection figure of draught fan impeller and the projection of hub disk 2, such as Fig. 3 and Fig. 4
It is shown.
Preferably, in the meridional projection figure of draught fan impeller, the top projection of blade 1 is curved section, and the curved section is recessed
Projection to hub disk 2, as shown in Figure 4.Specifically, the curved section can be the curve of hyperbola, camber line or other forms.
Further, length direction of the flow area along blade 1 is definite value between the leaf of draught fan impeller.So, effectively improve
Blower fan goes out to flow uniformity, further increases fan performance.It should be noted that realize between leaf flow area along blade 1
Length direction be definite value, be technology well-known to those skilled in the art, specifically, can by adjust the angle of blade 1 with
Length direction of the flow area along blade 1 keeps constant between realizing leaf.
In order to reduce the porch of blade 1 along velocity gradient, the son of prioritizing selection draught fan impeller between the short transverse each point of blade 1
In noon face perspective view, end on projection of the blade inlet section 11 away from blade exit section 12 is second straight line section, and second straight line section is certainly
It is tilted to it away from one end that hub disk 2 projects close to one end that hub disk 2 projects to the central axis of hub disk 2, such as Fig. 3-6 institutes
Show.Further, θ2<85 °, wherein, θ2For second straight line section and the angle of the central axis of hub disk 2.In actual application
In, θ can be set as needed2Occurrence.Preferably, 15 °<θ2<35°。
In above-mentioned draught fan impeller, blade 1 is entered on the basis of the advantages of following constant circulation flow pattern structure by reducing blade 1
Air velocity gradient at mouthful, improves blower fan and goes out to flow uniformity, reaches the effect of fan performance lifting.
In above-mentioned draught fan impeller, blade inlet section 11 is airfoil structure, wherein, airfoil structure exist it is a variety of, may be selected compared with
For what is commonly used, can also be selected according to being actually needed.Preferably, blade inlet section 11 is NACA airfoil structures, single arc wing
Type structure, biconvex aerofoil pro file structure or Bezier airfoil structure.It should be noted that NACA airfoil structures are states of the U.S.
A series of aerofoil profiles of Aeronautical Advisory Council of family (NACA) exploitation.Bezier airfoil structure refers to, along the central shaft of hub disk 2
Wire cutting blade 1, the section upper limb and lower edge of the blade 1 of acquisition are Bezier.Herein, section upper limb refers to the section
Edge away from hub disk 2, section lower edge refer to the section close to the edge of hub disk 2.Certainly, blade inlet section 11 also may be selected is
Other airfoil structures, it is not limited to above-mentioned several.
Preferably, above-mentioned draught fan impeller also includes shroud 3, in order to ensure fan performance, it is desirable to the meridian plane of draught fan impeller
In projection, the projection medium line of shroud 3 and the top projection of blade 1 are equal space line, as shown in Figure 6.It should be noted that shroud
3 projection medium line refers to line of the shroud 3 in the meridional projection figure of draught fan impeller between upper sideline and lower sideline, middle molded line
It is equal space line with upper sideline and middle molded line and lower sideline, and the distance and middle molded line and lower sideline of middle molded line and upper sideline
Distance it is equal.Upper sideline is the edge line that shroud 3 projects in the meridional projection figure of draught fan impeller away from hub disk 2, below
Line is the edge line that shroud 3 projects in the meridional projection figure of draught fan impeller close to hub disk 2.
It is understood that equal space line refers to, in two lines, the distance of any two points on a bar line to another line
It is equal.
In above-mentioned draught fan impeller, there are various ways in the fixation of shroud 3, manufacture for convenience, prioritizing selection shroud 3 and leaf
Piece 1 is integral type structure.
Certainly, the spiral case that shroud 3 is fixed on draught fan impeller also may be selected, in order to avoid the play that becomes a mandarin, it is desirable to shroud 3 and leaf
There is gap between piece 1.Further, the gap between shroud 3 and blade 1 is 1.5-6mm.Certainly, also can be according to actual need
The gap is selected as other values, it is not limited to above-mentioned numerical value.
The draught fan impeller provided based on above-described embodiment, the embodiment of the present invention additionally provide a kind of blade bone of draught fan impeller
Line approximating method, as shown in fig. 7, the center line of blade profile approximating method of the draught fan impeller specifically includes step：
S01：The center of circle O of draught fan impeller is set, sets one end of central axis of the blade 1 away from hub disk 2 away from hub disk 2
The distance R of mandrel line1And blade 1 is close to the distance R of central axis of the one end of the central axis of hub disk 2 away from hub disk 22；
In actual application, the center of circle O, R are set according to being actually needed1、R2, the embodiment of the present invention do not limited this.
S02：Using center of circle O as the center of circle, with R1Draw and justify for radius, form circle O1, using center of circle O as the center of circle, with R2Drawn for radius
Circle, form circle O2；
S03：Set point A, and point A and center of circle O distance r：
In actual application, according to the position for being actually needed set point A and r size, the embodiment of the present invention is to this
Do not limit.For the ease of fitting, prioritizing selection r>50%R1。
S04：The picture aerofoil profile bone line by point A, aerofoil profile bone line and the round O2Point C is met at, aerofoil profile bone line AC is blade
The bone line of entrance 11；
It should be noted that the picture aerofoil profile bone line by point A, the aerofoil profile bone line is designed according to being actually needed, this hair
Bright embodiment is not limited this.
S05：Determine the center of circle B of the bone line of blade exit section 12, using center of circle B as the center of circle, distance AB using point A to point B as
Radius, the picture arc by A, the arc and circle O1It is the bone line of blade exit section 12 to meet at point D, camber line AD, that is, completes fitting：
There are a variety of methods in center of circle B determination, it is preferred that make tangent line L of the bone line in point A of blade inlet section 111,
Point A makes tangent line L1Vertical line L2, line segment AO vertical line L is made in point O3, vertical line L2With vertical line L3Intersection point be center of circle B, such as Fig. 6
It is shown.
Certainly, other method can be also used, for example, making tangent line L of the bone line in point A of blade inlet section 111；With the center of circle
O is the center of circle, is drawn and justified as radius using r, makes round O3；Make round O3In point A tangent line L4, tangent line L1With tangent line L4Between angle be
β, according to r, ∠ OAB=β, ∠ AOB=90 ° of determination center of circle B.
In actual application, can also other method be used to obtain center of circle B, it is not limited to above two method.
The center line of blade profile approximating method for the draught fan impeller that above-described embodiment provides, realizes the fitting of blade.It is appreciated that
, step 04 and step 05 can change order.Action in other steps can also change on the premise of movement content is met
Sequentially, it is not limited to a kind of order of above-described embodiment description.
It should be noted that the bone line of blade inlet section 11 and the bone linear light slip of blade exit section 12.
It is understood that after the bone line of acquisition fitting blade 1, the bone line both sides of blade 1, shape are distributed in vane thickness
Into blade 1.
The draught fan impeller provided based on above-described embodiment, the embodiment of the present invention additionally provide a kind of blower fan, and the blower fan includes：
Impeller, wherein, the impeller is the draught fan impeller described in above-described embodiment.
Because the draught fan impeller that above-described embodiment provides has above-mentioned technique effect, blower fan tool provided in an embodiment of the present invention
There is above-mentioned draught fan impeller, then blower fan provided in an embodiment of the present invention also has corresponding technique effect, repeats no more herein.
The foregoing description of the disclosed embodiments, those skilled in the art are enable to realize or using the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and generic principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
The embodiments shown herein is formed on, and is to fit to consistent with principles disclosed herein and features of novelty most wide
Scope.
Claims (20)
- A kind of 1. draught fan impeller, it is characterised in that including：Hub disk (2), the blade (1) being arranged on the hub disk (2)；Wherein, the blade (1) includes connected blade inlet section (11) and blade exit section (12), the blade inlet section (11) it is sequentially distributed with length direction of the blade exit section (12) along the blade (1), the blade inlet section (11) is leaned on The central axis of the nearly hub disk (2), and the blade inlet section (11) is airfoil structure, and the blade exit section (12) is etc. Circular rector flow structure；The bone line of the blade inlet section (11) is aerofoil profile bone line, and the bone line of the blade exit section (12) is camber line.
- 2. draught fan impeller according to claim 1, it is characterised in that r>50%R1, wherein, r is the blade exit section (12) distance for central axis of the one end away from the hub disk (2) being connected with the blade inlet section (11), R1For the blade Distance of the outlet section (12) away from the central axis of the one end of blade inlet section (11) away from the hub disk (2).
- 3. draught fan impeller according to claim 1, it is characterised in that the blade (1) is straight blade.
- 4. draught fan impeller according to claim 1, it is characterised in that in the meridional projection figure of the draught fan impeller, institute The height for stating blade (1) projection increases with a reduction；Wherein, a is the central shaft of the blade (1) away from the hub disk (2) The distance of line.
- 5. draught fan impeller according to claim 4, it is characterised in that in the meridional projection figure of the draught fan impeller, institute The top projection for stating blade (1) is first straight line section.
- 6. draught fan impeller according to claim 5, it is characterised in that 3 °<θ1<16 °, θ1For the meridian of the draught fan impeller First straight line section described in the perspective view of face and the angle of the projection of the hub disk (2).
- 7. draught fan impeller according to claim 4, it is characterised in that in the meridional projection figure of the draught fan impeller, institute The top projection for stating blade (1) is curved section, and the curved section concaves towards the projection of the hub disk (2).
- 8. draught fan impeller according to claim 4, it is characterised in that flow area is described between the leaf of the draught fan impeller The length direction of blade (1) is definite value.
- 9. draught fan impeller according to claim 1, it is characterised in that in the meridional projection figure of the draught fan impeller, institute It is second straight line section to state end on projection of the blade inlet section (11) away from the blade exit section (12), and the second straight line section is certainly It is away from one end that the hub disk (2) projects to its central shaft close to one end of the hub disk (2) projection to the hub disk (2) Line tilts.
- 10. draught fan impeller according to claim 9, it is characterised in that 15 °<θ2<35 °, wherein, θ2For the second straight line Section and the angle of the central axis of the hub disk (2).
- 11. draught fan impeller according to claim 1, it is characterised in that the blade inlet section (11) is NACA aerofoil profile knots Structure, single circular arc airfoil structure, biconvex aerofoil pro file structure or Bezier airfoil structure.
- 12. according to the draught fan impeller described in any one in claim 1-11, it is characterised in that described also including shroud (3) In the meridional projection of draught fan impeller, the projection medium line of the shroud (3) and the top projection of the blade (1) are equidistant Line.
- 13. draught fan impeller according to claim 12, it is characterised in that the shroud (3) is integrated with the blade (1) Formula structure.
- 14. draught fan impeller according to claim 12, it is characterised in that the shroud (3) is fixed on the draught fan impeller Spiral case, and there is gap between the shroud (3) and the blade (1).
- 15. draught fan impeller according to claim 14, it is characterised in that between the shroud (3) and the blade (1) Gap is 1.5-6mm.
- 16. a kind of center line of blade profile approximating method of the draught fan impeller in 1-15 such as claim as described in any one, its feature exist In, including step：Set the center of circle O of the draught fan impeller, set the blade (1) away from the hub disk (2) central axis one end away from The distance R of the central axis of the hub disk (2)1And the blade (1) close to the hub disk (2) central axis one end away from The distance R of the central axis of the hub disk (2)2；Using center of circle O as the center of circle, with R1Draw and justify for radius, form circle O1, using center of circle O as the center of circle, with R2Draw and justify for radius, form circle O2；Set point A, and point A and center of circle O distance r；The picture aerofoil profile bone line by point A, the aerofoil profile bone line and the round O2Point C is met at, aerofoil profile bone line AC is that the blade enters The bone line of mouth section (11)；The center of circle B of the bone line of the blade exit section (12) is determined, using center of circle B as the center of circle, using point A to point B distance AB as half Footpath, the picture arc by point A, the arc and circle O1It is the bone line of the blade exit section (12) to meet at point D, camber line AD, that is, is completed Fitting.
- 17. the center line of blade profile approximating method of draught fan impeller according to claim 16, it is characterised in that determine center of circle B's Concretely comprise the following steps：Make tangent line L of the bone line in point A of the blade inlet section (11)1, tangent line L is made in point A1Vertical line L2, Line segment AO vertical line L is made in point O3, the vertical line L2With the vertical line L3Intersection point be the center of circle B.
- 18. the center line of blade profile approximating method of draught fan impeller according to claim 16, it is characterised in that determine the center of circle B's concretely comprises the following steps：Make tangent line L of the bone line in point A of the blade inlet section (11)1,Using center of circle O as the center of circle, drawn and justified as radius using r, make round O3,Make round O3In point A tangent line L4, the tangent line L1With the tangent line L4Between angle be β, according to r, ∠ OAB=β, ∠ AOB=90 ° determines the center of circle B.
- 19. the center line of blade profile approximating method of draught fan impeller according to claim 16, it is characterised in that r>50%R1。
- 20. a kind of blower fan, including：Impeller, it is characterised in that the impeller is as described in any one in claim 1-15 Draught fan impeller.
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| CN201510405155.8A CN104912846B (en) | 2015-07-10 | 2015-07-10 | Draught fan impeller and its center line of blade profile approximating method, blower fan |
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| CN201510405155.8A CN104912846B (en) | 2015-07-10 | 2015-07-10 | Draught fan impeller and its center line of blade profile approximating method, blower fan |
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| CN107013490B (en) * | 2017-04-20 | 2018-12-18 | 浙江理工大学 | A kind of optimization method of Low-pressure axial fan impeller blade |
| CN112160937B (en) * | 2020-09-21 | 2021-08-20 | 华中科技大学 | Cross-flow fan blade |
| CN113007135B (en) * | 2021-04-25 | 2022-03-18 | 华中科技大学 | Axial flow blade and axial flow fan |
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| EP1013938B1 (en) * | 1998-12-18 | 2001-08-01 | Lothar Reckert | Low specific speed blower rotor |
| JP5342485B2 (en) * | 2010-03-25 | 2013-11-13 | 三菱電機株式会社 | Fan, electric blower including the fan, electric vacuum cleaner using the electric blower, and fan manufacturing method |
| CN104279188A (en) * | 2014-10-29 | 2015-01-14 | 珠海格力电器股份有限公司 | Centrifugal fan and air conditioner with same |
| CN104763679A (en) * | 2015-03-19 | 2015-07-08 | 珠海格力电器股份有限公司 | Fan blade, draught fan and air conditioner |
| CN205013369U (en) * | 2015-07-10 | 2016-02-03 | 珠海格力电器股份有限公司 | Fan wheel and fan |
-
2015
- 2015-07-10 CN CN201510405155.8A patent/CN104912846B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1013938B1 (en) * | 1998-12-18 | 2001-08-01 | Lothar Reckert | Low specific speed blower rotor |
| JP5342485B2 (en) * | 2010-03-25 | 2013-11-13 | 三菱電機株式会社 | Fan, electric blower including the fan, electric vacuum cleaner using the electric blower, and fan manufacturing method |
| CN104279188A (en) * | 2014-10-29 | 2015-01-14 | 珠海格力电器股份有限公司 | Centrifugal fan and air conditioner with same |
| CN104763679A (en) * | 2015-03-19 | 2015-07-08 | 珠海格力电器股份有限公司 | Fan blade, draught fan and air conditioner |
| CN205013369U (en) * | 2015-07-10 | 2016-02-03 | 珠海格力电器股份有限公司 | Fan wheel and fan |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104912846A (en) | 2015-09-16 |
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