CN209539585U - A kind of bionic blade is without spiral case centrifugal fan - Google Patents
A kind of bionic blade is without spiral case centrifugal fan Download PDFInfo
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- CN209539585U CN209539585U CN201822201434.4U CN201822201434U CN209539585U CN 209539585 U CN209539585 U CN 209539585U CN 201822201434 U CN201822201434 U CN 201822201434U CN 209539585 U CN209539585 U CN 209539585U
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- centrifugal fan
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Abstract
The utility model discloses a kind of bionic blades without spiral case centrifugal fan, including motor, impeller, air inlet, bracket and panel, and one end of the bracket is fixedly connected with panel, and the other end of the bracket is fixedly connected with one end of motor；Impeller includes hub disk, blade and shroud, and blade is provided between the hub disk and shroud of impeller, and hub disk, blade, the shroud of impeller are fixedly connected, and the hub disk of impeller is fixedly connected with the other end of motor, and the shroud and air inlet of impeller are running-on cooperation；The blade exit outer rim of the impeller is a camber line, it is the first area by the area that the straight line for being parallel to axis and blade outer rim camber line and shroud at the camber line midpoint are formed, the area that the straight line for being parallel to axis and blade outer rim camber line and hub disk at the camber line midpoint are formed is second area, and first area is equal to second area.Using the utility model, the static pressure of ventilation blower is increased, improves the efficiency of ventilation blower.
Description
Technical field
The utility model relates to ventilation blower technical fields more particularly to a kind of bionic blade without spiral case centrifugal fan.
Background technique
Currently, the blade of many Centrifugal Fan Impellers, the meridional projection at the edge in outer blade diameter exit is one
It is parallel to the straightway of axis, from shroud side to hub disk side, radius of the blade outer rim everywhere relative to axle center is equal.
In operation, generally, the air velocity of outlet is in the axial direction from shroud for backward Centrifugal Fan Impeller
The distribution of side to hub disk side is not completely the same.
By CFD sunykatuib analysis and many experiments observation repeatedly, find bionic blade without spiral case centrifugal fan small
When flow rate zone is run, outlet primary air is obviously partial to by shroud side, with the continuous increase of flow rate of fan, main gas
The axial width of stream is gradually extended to hub disk side, or even is full of entire exit width section.
The inhomogeneities of Centrifugal Fan Impeller outlet air flow velocity necessarily bring mutual vibration between exit flow and
Friction to generate flow losses, and then reduces ventilator pressure and efficiency, generates additional exit flow quadratic noise.
Utility model content
The purpose of the utility model is to provide a kind of bionic blades without spiral case centrifugal fan, to improve the static pressure of ventilation blower
And efficiency.
The utility model discloses a kind of bionic blades without spiral case centrifugal fan, which includes: motor, leaf
One end of wheel, air inlet, bracket and panel, the bracket is fixedly connected with panel, and the one of the other end of the bracket and motor
End is fixedly connected；Impeller includes hub disk, blade and shroud, is provided with blade between the hub disk and shroud of impeller, the hub disk of impeller,
Blade, shroud are fixedly connected, and the hub disk of impeller is fixedly connected with the other end of motor, and the shroud and air inlet of impeller are matched for running-on
It closes；
The blade exit outer rim of the impeller be a camber line, by the camber line midpoint the straight line for being parallel to axis with
The area that blade outer rim camber line and shroud are formed is the first area, and the camber line midpoint is parallel to outside the straight line and blade of axis
The area that edge camber line and hub disk are formed is second area, and first area is equal to second area.
The first area of the technical program is equal to second area, the two areas are to cut benefit relationship, realize blade exit portion
The adjustment of axial position where the area of position, to make the speed of exit flow in uniform change of gradient.
Preferably, the face plate center is provided with through-hole, and the circumference along the through-hole is provided with mounting hole；The air inlet
One end connect with panel by the mounting hole, the shroud running-on cooperation of the other end and impeller of the air inlet.
Preferably, air inlet outlet loop diameter is less than impeller front disc entrance loop diameter, between air inlet and impeller
Radial clearance uniformity distribution.
Preferably, the camber line is camber line on the inside of imitative whale tail fin.
Preferably, the blade of impeller is straightedge vane, and blade camber line is composite line, and the composite line includes multiple arcs
Line segment and straightway.Enable inlet diameter, stagger angle, outlet diameter, exit installation angle equidimension parameter difference one by one
It is independent to realize, relieve the mutual relevance constraint of the above-mentioned dimensional parameters of the arc-shaped straight blade of the injectivity radius.
Preferably, the corresponding center of circle cornerite of arc surface of the blade from input end to outlet end are as follows: 55 °~65 °.Leaf
Piece is designed using big cornerite, is extended blade in impeller and is conducive to the pressure and effect that improve ventilation blower to the arc length of air work
Rate.
Preferably, the blade inlet edge is the compound arc shape being gradually increased from hub disk side to shroud side, blade
The stagger angle being gradually increased is formed in the axially different position of its ingress edge after installation.Reduce inlet air flow impact and its
Bring impact loss and impact noise, and then improve inlet air flow and improve flow rate of fan, pressure and efficiency, it reduces simultaneously
Import impact noise.
Preferably, multiple small teeth, the tooth top both ends of each small tooth and tooth root wedge angle are opened up on blade exit edge line
Fillet is fallen.Eliminate the air-flow tail bring pressure loss and additional noise.
The blade exit outer rim of impeller of the bionic blade of the utility model without spiral case centrifugal fan is a camber line, with
The blade exit outer rim of prior art impeller is compared for straight line, and distribution of exit velocities is more reasonable, improves static pressure and efficiency, drop
Low exit swirl noise.
Detailed description of the invention
Fig. 1 is a kind of a kind of schematic diagram of embodiment of the bionic blade of the utility model without spiral case centrifugal fan；
Fig. 2 is a kind of schematic front view of impeller of the bionic blade of the utility model without spiral case centrifugal fan；
Fig. 3 is the left view schematic diagram of Fig. 2；
Fig. 4 is a kind of a kind of meridian plane of embodiment of impeller of the bionic blade of the utility model without spiral case centrifugal fan
Cross-sectional view (i.e. main view)；
Fig. 5 is the half view of Fig. 3 with broken section structure；
Fig. 6 is a kind of blade type line chart of impeller of the bionic blade of the utility model without spiral case centrifugal fan；
Fig. 7 is outside a kind of a kind of blade of embodiment of impeller of the bionic blade of the utility model without spiral case centrifugal fan
Uncinus shape figure；
Fig. 8 is the portion the C enlarged drawing of Fig. 7.
In figure:
1. motor, 2. impellers, 3. air inlets, 4. brackets, 5. panels, 23. hub disks, 22. blades, 21. shrouds.
Specific embodiment
The utility model is described in detail with reference to the accompanying drawing.
With reference to Fig. 1, which is a kind of a kind of showing for embodiment of the bionic blade of the utility model without spiral case centrifugal fan
It is intended to, which includes: motor 1, impeller 2, air inlet 3, bracket 4 and panel 5, and one end of bracket 4 and panel 5, which are fixed, to be connected
It connects, the other end of bracket 4 is fixedly connected with one end of motor 1；The other end of motor 1 is connect with one end of impeller 2, impeller 2
One end running-on of the other end and air inlet 3 cooperates, and the other end of air inlet 3 is fixedly connected with panel 5.
Motor 1 is EC external rotor electric machine, the bionical leaf of EC external rotor electric machine (DC permanent-magnetic brushless external rotor electric machine) driving
Piece without spiral case centrifugal fan have it is high-efficient, noise is low, size is small, installation maintenance is simple and convenient, operation automatic adjustment property it is good,
The superiority such as remote controlled start and stop and operation, safety and environmental protection, in recent years in commercial and domestic air conditioning ventilating system, accurate ventilation
The mating application in the fields such as system, high-end air cleaning facility is increasingly extensive, to such ventilation blower by structural dimension optimization and
The more Proper Match of ventilation blower and motor, and then ventilation fan delivery and pressure are improved, it reduces power consumption, improve using energy source
Efficiency reduces noise etc. and is of great practical significance, can bring significant economic benefit and social benefit.
Impeller 2, as shown in Figures 2 and 3, including hub disk 23, blade 22 and shroud 21, the hub disk 23 and shroud 21 of impeller it
Between be provided with blade 22, the shroud 21 of impeller is fixedly connected with air inlet.It is through-hole inside the hub disk 23 of impeller 2, along hub disk 23
The circumference of internal through-hole is provided with the small mounting hole of a circle, the circle peace on 1 rotor flange of impeller hub disk mounting hole and motor
Dress hole is attached by bolt, so that impeller 2 and motor 1 are securely attached together.
Blade 22, each blade have 4 edges, in which: one edge is connect with shroud；Article 2 edge and hub disk
Connection；Article 3 is blade exit outer edge, which is a camber line.The straight of axis is parallel to by the camber line midpoint
The area that line and blade outer rim camber line and shroud are formed is the first area, the straight line and blade for being parallel to axis at the camber line midpoint
The area that outer rim camber line and hub disk are formed is second area, which is equal to second area, the two areas are to cut benefit to close
System, realizes the adjustment of the axial position where the area at blade exit position, to improve outlet air flow velocity distribution
Reasonability；Article 4 edge is vane inlet edge, which is a camber line.
It is described in detail with reference to the accompanying drawing.
It, can be for above-mentioned the can be made it should be noted that the camber line of the blade exit outer rim in the utility model embodiment
One area and the identical random arc line of second area are now that imitative whale tail fin inner edge camber line is with the camber line of the blade exit outer rim
Example is illustrated, with reference to Fig. 4 and Fig. 5, in which:
Outer blade diameter (i.e. blade mean outside diameter) are as follows: D2m= 360.5 mm；
Blade leans on shroud side outer diameter: D21= 374 mm；
Blade leans on hub disk side outer diameter: D22= 347 mm；
Revolving speed are as follows: 2600 r/min；
Comparing result is as follows:
(a) blade outer rim flat side
Air quantity: 4522 m3/ h, static pressure: 930.2 Pa, efficiency: 65.15 %；
(b) when blade outer rim is camber line
Air quantity: 4522 m3/ h, static pressure: 979.5 Pa, efficiency: 68.34 %.
It can be seen that from above-mentioned comparison in the case where blade acting area is constant:
Static pressure of fan improves 49.3 Pa；
Fan efficiency improves 3.19 %.
The case where now cutting benefit to area described in the utility model embodiment is described in detail, and described area cuts benefit
It is the first area by the area that the straight line for being parallel to axis and blade outer rim camber line and shroud at the camber line midpoint are formed,
The area that the straight line for being parallel to axis at the camber line midpoint and blade outer rim camber line and hub disk are formed is second area, described the
One area is equal to second area.As shown in Figure 4 and Figure 5, projection of the fin shape edge line in blade exit portion in meridian plane view
For camber line " QZH ", 3 points of Q, Z, H respectively correspond blade exit diameter of phi D21、ΦD2m 、ΦD22, projected area on meridian plane
A represents the area filled close to shroud side in blade exit portion, b represents the area that blade exit portion is prescinded close to hub disk side,
They respectively represent arc segment " 1m " and " m2 " on blade camber line.
The present embodiment are as follows: Z point is located at the position of the half of impeller outlet width,
The area equation of a and b；
The arc length of " 1m " and " m2 " are equal.
(Φ D21-ΦD2m)/Φ D2m =ΦD2m/ (Φ D2m -ΦD22)=1.038
" QZ " camber line, " ZH " camber line main body be circular arc, radius is 250mm.
Air inlet 3, one end are connect with impeller 2, and the other end is connect with panel.Specifically, air inlet 3 and impeller 2 are to belong to
In the matching relationship of static element and revolving part, air inlet 3 exports loop diameter and is less than 2 shroud of impeller, 21 entrance loop diameter, air inlet 3
Outlet of hose protrudes into inside impeller 2；When specific implementation, need to protrude into air inlet 3 axial distance and air inlet 3 of impeller 2
Radial clearance between impeller 2 is adjusted, and is uniformly distributed their gap.In addition, air inlet 3 is in the company with panel 5
Connect, concrete implementation mode are as follows: have a through-hole among panel 5, nearby have a circle small mounting hole, by air inlet 3 from
Through-hole therein is inserted in into, by one group of mounting hole in 3 Flange Plane of one group of mounting hole and air inlet on panel 5, is used
Bolt links together the two.Air inlet is static element, plays the role of for extraneous gas being directed to 2 inside of impeller.
In addition, shown in Figure 5, blade 22 uses straight blade, and shape is composite line, i.e., arc shape includes more
A arc segment and straightway are advantageous in that the inlet diameter φ D gone out by theory analysis, optimization design1, stagger angle
β1A, outlet diameter φ D2, exit installation angle β2AEquidimension parameter is able to respectively independent realization one by one, relieves the injectivity radius circular arc
The mutual relevance constraint of the above-mentioned dimensional parameters of shape straight blade.Wherein, wheel disc (including shroud 21 and hub disk 23)
Diameter is φ D3, vane inlet established angle can be β1A=17 °~23 °, blade exit established angle can be β2A=27 °~33 °, leaf
The piece number can be Z=5 piece~13 piece (containing 5 and 13), and the ratio of internal diameter blade and outer diameter can be D1/D2=0.64~0.72.
In addition, the corresponding central angle of circular arc of the blade from input end to outlet end is designed using big cornerite, impeller is extended
Middle blade is conducive to the pressure and efficiency that improve ventilation blower to the arc length of air work, wrap angle sigma=55 °~65 °, as shown in Figure 6.
In addition, blade inlet edge is the compound arc shape being gradually increased from hub disk side to shroud side, after blade installation
The stagger angle being gradually increased is formed in the axially different position of its ingress edge.As shown in figure 4, in impeller meridian plane, entrance
Air-flow has one to curve from axial direction to the channel entered blade, and the air velocity under different radii is also different, correspondingly will
Blade inlet edge designs are from hub disk side diameter phi D12To shroud side diameter phi D11The compound camber line being gradually increased it is specific enter
Mouth edge shape, forms the stagger angle that the blade inlet of axially different position incrementally increases, to reduce inlet air flow punching
It hits and its bring impact loss and impact noise, and then improves inlet air flow and improve flow rate of fan, pressure and efficiency, together
When reduce import impact noise.Moreover, blade inlet edge line is the compound arc being composed of multiple arc segments and straightway
Line, camber line " EFGJK " are projection of the vane inlet edge camber line in meridian plane.
As shown in Figure 7 and Figure 8, sawtooth is opened up on blade exit edge line can eliminate air-flow tail to a certain extent bring
The pressure loss and additional noise.
Wherein:
The small tooth number of single blade outlet edge can be ZC=11~19 (containing 11 and 19)；
The facewidth of single small tooth can be U=2.5mm~7.5mm；
The depth of single small tooth can be V=2.5mm~7.5mm.
When it is implemented, 5 side of panel (i.e. 3 face-flange side of air inlet, relative to 1 tail portion side of motor) is ventilation
The entrance side of machine.It is powered operation 2 high speed rotation of impeller by motor 1, by ventilation blower internal gas from the outer diameter four of impeller 2
Week discharge, to form the negative pressure state of similar vacuum inside impeller 2, and then will be in Fan Inlet gas intake impeller 2
It is then exhausted from behind portion, forms motor 1 and impeller 2 continuously runs acting and sucks and be discharged the process of gas, reach gas conveying
Purpose.
The blade exit outer rim of impeller of the bionic blade of the utility model without spiral case centrifugal fan is a camber line, and
And when the straight line using the parallel and axis by camber line midpoint cuts camber line, it is parallel to straight line, the camber line of axis
The area equation that area and the straight line, camber line and the hub disk formed with shroud is formed.It realizes and is keeping blade exit outer rim
In the case that average diameter is same as the prior art, axial position where the area at blade exit position is adjusted, from
And the reasonability of centrifugal fan blade exit Velocity Profiles is improved, improve the static pressure and efficiency of ventilation blower.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (9)
1. a kind of bionic blade is without spiral case centrifugal fan, which is characterized in that including motor, impeller, air inlet, bracket and face
One end of plate, the bracket is fixedly connected with panel, and the other end of the bracket is fixedly connected with one end of motor；Impeller includes
Hub disk, blade and shroud are provided with blade between the hub disk and shroud of impeller, hub disk, blade, the shroud of impeller are fixedly connected,
The hub disk of impeller is fixedly connected with the other end of motor, and the shroud and air inlet of impeller are running-on cooperation；
The blade exit outer rim of the impeller is a camber line, by the straight line and blade for being parallel to axis at the camber line midpoint
The area that outer rim camber line and shroud are formed is the first area, the straight line for being parallel to axis and blade outer rim arc at the camber line midpoint
The area that line and hub disk are formed is second area, and first area is equal to second area.
2. bionic blade according to claim 1 is without spiral case centrifugal fan, which is characterized in that the face plate center setting
There is through-hole, the circumference along the through-hole is provided with mounting hole；One end of the air inlet is connect by the mounting hole with panel,
The other end of the air inlet and the shroud running-on of impeller cooperate.
3. bionic blade according to claim 1 is without spiral case centrifugal fan, which is characterized in that the air inlet exit ring
Diameter is less than impeller front disc entrance loop diameter, the radial clearance uniformity distribution between air inlet and impeller.
4. bionic blade according to claim 1 is without spiral case centrifugal fan, which is characterized in that the air inlet is loudspeaker
Shape air guide hole.
5. bionic blade according to claim 1 is without spiral case centrifugal fan, which is characterized in that the camber line is imitative whale
Camber line on the inside of tail fin.
6. bionic blade according to claim 1 is without spiral case centrifugal fan, which is characterized in that the blade of impeller is uniform thickness
Blade, blade camber line are composite line, and the composite line includes multiple arc segments and straightway.
7. bionic blade according to claim 1 is without spiral case centrifugal fan, which is characterized in that the blade is from input end
The cornerite in the corresponding center of circle of arc surface to outlet end is 55 °~65 °.
8. bionic blade according to claim 1 is without spiral case centrifugal fan, which is characterized in that the blade inlet edge
For the compound arc shape being gradually increased from hub disk side to shroud side, in the axially different position shape of its ingress edge after blade installation
At the stagger angle being gradually increased.
9. bionic blade according to claim 1 is without spiral case centrifugal fan, which is characterized in that the blade exit edge
Open up multiple small teeth on line, the tooth top both ends of each small tooth and tooth root wedge angle have fallen fillet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822201434.4U CN209539585U (en) | 2018-12-26 | 2018-12-26 | A kind of bionic blade is without spiral case centrifugal fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822201434.4U CN209539585U (en) | 2018-12-26 | 2018-12-26 | A kind of bionic blade is without spiral case centrifugal fan |
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| CN209539585U true CN209539585U (en) | 2019-10-25 |
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| CN201822201434.4U Active CN209539585U (en) | 2018-12-26 | 2018-12-26 | A kind of bionic blade is without spiral case centrifugal fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404305A (en) * | 2018-12-26 | 2019-03-01 | 浙江科贸智能机电股份有限公司 | A kind of bionic blade is without spiral case centrifugal fan |
-
2018
- 2018-12-26 CN CN201822201434.4U patent/CN209539585U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404305A (en) * | 2018-12-26 | 2019-03-01 | 浙江科贸智能机电股份有限公司 | A kind of bionic blade is without spiral case centrifugal fan |
| CN109404305B (en) * | 2018-12-26 | 2023-11-21 | 浙江科贸智能机电股份有限公司 | Bionic blade volute-free centrifugal ventilator |
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