CN206957981U - A kind of multi-wing centrifugal fan blade - Google Patents
A kind of multi-wing centrifugal fan blade Download PDFInfo
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- CN206957981U CN206957981U CN201720787391.5U CN201720787391U CN206957981U CN 206957981 U CN206957981 U CN 206957981U CN 201720787391 U CN201720787391 U CN 201720787391U CN 206957981 U CN206957981 U CN 206957981U
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Abstract
The utility model discloses a kind of multi-wing centrifugal fan blade, it is characterised in that：The entrance point curve AB of vane type line is log spiral, and the port of export curve BC of vane type line is circular arc line.Compared with prior art, the utility model has the advantage of：A kind of brand-new vane type line of the multi-wing centrifugal fan blade design, the entrance point curve AB of vane type line is log spiral, port of export curve BC is circular arc line, the circular arc line of existing entrance point is instead of with helix, import impact is reduced using the characteristics of log spiral is small to deflection gas shock, separation is few, vacuum side of blade separation situation is reduced in addition, while design parameter is more reasonable, effectively improves overall flow efficiency.In addition, after the outlet side of vane type line sets the straightway CD being connected with port of export curve BC phases, can increase export side pressure, make outlet side flowing improvement more preferable.
Description
Technical field
A kind of centrifugal blower is the utility model is related to, more particularly, to a kind of multi-wing centrifugal fan blade.
Background technology
Centrifugal blower has obtained extensive reference with the advantages that its suction is big, noise is low, compact-sized in range hood.
As shown in Figure 5 and Figure 6, the impeller 1c of existing multi-wing centrifugal fan blade 2c mainly uses single circular arc molded line structure, i.e.,
AC sections in Fig. 6 are circular arc, and inlet air flow impact is larger, can reduce fan efficiency and increase noise simultaneously.At present, existing skill
In art it is disclosed have lift the blower fan structure of fan performance by changing vane type line, such as Application No. 201510270958.7
Disclosed in the Chinese invention patent application of (application publication number is the A of CN 104929983)《A kind of low noise fume machine impeller snail
Shell systems》, it discloses the air inlet end of blade around the center arrangement of impeller and to form inner arc track, the air opening end of blade
Around impeller center arrangement and form outer arc track, form α between the outer arc tangent line of air inlet end and the tangent line of inner arc track
Angle, and 60 ° of 90 ° of ＜ α ＜, β angles, and 150 ° of ＜ β are formed between the outer arc tangent line of air opening end and the tangent line of outer arc track
170 ° of ＜.Although the spiral case system can reduce air-flow shock and energy loss, make wind by α angles and β angles reasonable in design
Machine performance can improve, and still, it disclose only the angular dimension of air inlet end and air opening end, to the specific of vane type line
Structure does not illustrate.In summary, need to be further improved existing centrifugal fan blade structure.
Utility model content
Technical problem to be solved in the utility model is to be directed to above-mentioned state of the art, there is provided one kind can reduce import
Impact, lift the multi-wing centrifugal fan blade of blower fan overall flow efficiency.
Technical scheme is used by the utility model solves above-mentioned technical problem：The multi-wing centrifugal fan blade, it is special
Sign is：The entrance point curve AB of vane type line is log spiral, and the port of export curve BC of vane type line is circular arc line.
Preferably, the entrance point curve AB is the angle log spiral that the angle of flare gradually expands.
Further preferably, the polar radius R of the entrance point curve AB is defined asWherein,
R1For radius, the variable helical angle of flare corresponding to vane type line A pointsλ1With
λ2∈ [2 °, 8 °],For entrance point curve AB cornerite, adjustment item s ∈ [- 0.5,0.5], r ∈ [- 5,
5] and r ≠ 1, s are adjustment factorθ0For the start angle of entrance point curve AB B points, θ is entrance point
The polar angle variable of arbitrfary point on curve AB.
Further preferably, total wrap angle sigma ∈ [70 °, 120 °] of vane type line, entrance point curve AB polar angle variables θ
∈[0°,70°)。
As another preferred scheme, the entrance point curve AB is the equal isogonism log spiral of the angle of flare.
Further preferably, mutually held in the mouth by one section of transition arc between the entrance point curve AB and port of export curve BC
Connect.So, if cause both curvature difference larger because of parameter selection, entrance point curve can be made by the transition arc
AB and port of export curve BC smoothly transit.
For side pressure of increasing export, it is provided with what is be connected with the port of export curve BC phases in the outlet side of vane type line
Straightway CD.
In order that outlet side flowing improvement is more preferable, the straightway CD and the port of export curve BC are tangent.
Further preferably, the circumferential angle β ∈ corresponding to the straightway CD (0 °, 5 °].
Compared with prior art, the utility model has the advantage of：The multi-wing centrifugal fan blade design is a kind of brand-new
Vane type line, the entrance point curve AB of vane type line is log spiral, and port of export curve BC is circular arc line, that is, uses helix
The circular arc line of existing entrance point is instead of, rushes import using the characteristics of log spiral is small to deflection gas shock, separation is few
Reduction is hit, reduces vacuum side of blade separation situation in addition, while design parameter is more reasonable, effectively improves overall flow efficiency.
In addition, after the outlet side of vane type line sets the straightway CD being connected with port of export curve BC phases, can increase export side pressure
Power, make outlet side flowing improvement more preferable.
Brief description of the drawings
Fig. 1 is the structural representation of the impeller of the utility model embodiment one；
Fig. 2 is the structural representation of the vane type line of the utility model embodiment one；
Fig. 3 is the structural representation of the impeller of the utility model embodiment two；
Fig. 4 is the structural representation of the vane type line of the utility model embodiment two；
Fig. 5 is the structural representation of existing impeller；
Fig. 6 is the structural representation of the vane type line of existing impeller.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
Embodiment one：
As depicted in figs. 1 and 2, the multi-wing centrifugal fan blade 2a of the utility model embodiment is along impeller 1a circumferential rows
Cloth, blade 2a vane type line include entrance point curve AB and port of export curve BC, wherein, entrance point curve AB be the angle of flare by
The big angle log spiral of flaring, port of export curve BC are circular arc line.
In the present embodiment, entrance point curve AB polar radius R is defined asWherein, R1For blade type
Radius corresponding to line A points, i.e. OA length, the variable helical angle of flare in Fig. 1
λ1And λ2∈ [2 °, 8 °],For entrance point curve AB cornerite, adjustment item s ∈ [- 0.5,0.5], r ∈
[- 5,5] and r ≠ 1, s are adjustment factorθ0For the start angle of entrance point curve AB B points, θ be into
The polar angle variable of arbitrfary point on mouth end curve AB.After the determination of B points,Value be θ0Value.
Total wrap angle sigma ∈ [70 °, 120 °] of vane type line, entrance point curve AB polar angle variable θ ∈ [0 °, 70 °).
Embodiment two：
As shown in Figure 3 and Figure 4, the multi-wing centrifugal fan blade 2b of the present embodiment arranges along impeller 1b circumference, its blade
Molded line adds straightway CD on the basis of the vane type line of embodiment one.Straightway CD located at vane type line outlet side and with
Port of export curve BC phases are connected, and straightway CD and port of export curve BC are tangent, also, the circumferential angle β corresponding to straightway CD
∈(0°,5°].After vane type line outlet side sets straightway CD, can substantially increase export side pressure, so that outlet
Side flowing improvement is more preferable.
It the foregoing is only preferred embodiment of the present utility model, it is noted that for those of ordinary skill in the art
For, under the premise of principle of the present utility model is not departed from, a variety of remodeling or improvement can be carried out to the utility model, such as,
Entrance point curve AB can also use the log spiral of isogonism, and for example, in order that entrance point curve AB and port of export curve
BC can smoothly transit when curvature difference is larger, can pass through one section of transition between entrance point curve AB and port of export curve BC
Circular arc is mutually connected, and these are regarded as within the scope of protection of the utility model.
Claims (9)
- A kind of 1. multi-wing centrifugal fan blade, it is characterised in that：The entrance point curve AB of vane type line is log spiral, blade The port of export curve BC of molded line is circular arc line.
- 2. multi-wing centrifugal fan blade according to claim 1, it is characterised in that：The entrance point curve AB is the angle of flare The angle log spiral gradually expanded.
- 3. multi-wing centrifugal fan blade according to claim 2, it is characterised in that：The polar radius of the entrance point curve AB R is defined asWherein, R1For the radius corresponding to vane type line A points, the variable helical angle of flareλ1And λ2∈ [2 °, 8 °], For entrance point curve AB cornerite, adjustment item s ∈ [- 0.5,0.5], r ∈ [- 5,5] and r ≠ 1, s are adjustment factorθ0To enter The start angle of mouth end curve AB B points, θ are the polar angle variable of arbitrfary point on entrance point curve AB.
- 4. multi-wing centrifugal fan blade according to claim 3, it is characterised in that：Vane type line total wrap angle sigma ∈ [70 °, 120 °], entrance point curve AB polar angle variable θ ∈ [0 °, 70 °).
- 5. multi-wing centrifugal fan blade according to claim 1, it is characterised in that：The entrance point curve AB is the angle of flare Equal isogonism log spiral.
- 6. multi-wing centrifugal fan blade according to claim 1, it is characterised in that：In the entrance point curve AB and outlet Mutually it is connected by one section of transition arc between the curve BC of end.
- 7. multi-wing centrifugal fan blade according to claim 1, it is characterised in that：Vane type line outlet side be provided with The straightway CD that the port of export curve BC phases are connected.
- 8. multi-wing centrifugal fan blade according to claim 7, the straightway CD and the port of export curve BC are tangent.
- 9. multi-wing centrifugal fan blade according to claim 7, it is characterised in that：Circumference corresponding to the straightway CD Angle beta ∈ (0 °, 5 °].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720787391.5U CN206957981U (en) | 2017-06-30 | 2017-06-30 | A kind of multi-wing centrifugal fan blade |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720787391.5U CN206957981U (en) | 2017-06-30 | 2017-06-30 | A kind of multi-wing centrifugal fan blade |
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| CN206957981U true CN206957981U (en) | 2018-02-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108005953A (en) * | 2017-06-30 | 2018-05-08 | 宁波方太厨具有限公司 | A kind of multi-wing centrifugal fan blade |
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2017
- 2017-06-30 CN CN201720787391.5U patent/CN206957981U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108005953A (en) * | 2017-06-30 | 2018-05-08 | 宁波方太厨具有限公司 | A kind of multi-wing centrifugal fan blade |
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