A kind of two-way multi-wing centrifugal fan impeller of single side air inlet
Technical field
The invention belongs to bathroom air exchanging technical fields, are related to a kind of two-way multi-wing centrifugal fan impeller of single side air inlet.
Background technology
The two-way centrifugal blower performance all lower problems of generally existing performance being currently embedded in bathroom air exchanging device, nothing
Method is compared with unidirectional fan.In today that heating ventilation industry increasingly minimizes product, positive reverse centrifuge wind has seriously been hindered
Application of the machine in air interchanger and development, promote its performance and are necessary.Wind wheel and air duct volume are identical unidirectional more at present
Wing centrifugal blower performance ratio is two-way to want big 1 times or more.
Have the characteristics that discharge coefficient is big, pressure coefficient is high and compact-sized in view of multi-wing centrifugal fan, in industrial products
Middle acquirement extensive use, is also widely used in the electric household appliances such as Domestic ventilation device in addition.Its structure includes motor, snail
Shell and impeller.At present for ventilation device structure in bathroom, as shown in Figures 1 and 2, it is desirable that multiple wing inside air interchanger from
Heart draught fan impeller rotate forward when by right-side outlet to interior air blowing come the air in circulating bathroom, right side air-out mouth be referred to as take a breath
Mouthful, by ptc heater heating air when reversion and blowing out warm wind in left side outlet makes room temperature increase, and left side air outlet is referred to as to dry
Mouthful.It is therefore desirable to which impeller has the ability of positive and negative rotation, while ensureing that the air quantity rotated and reverse is equal as far as possible, this becomes
Promote the difficult point of the two-way ventilating device aeroperformance.Current this two-way multi-wing centrifugal fan impeller blade mostly uses greatly radial direction
The air quantity that blade, i.e. blade center line overlap to ensure to rotate and reverse with impeller radial direction is equal.The wind of this blade impeller
Amount is smaller, and pressure coefficient is relatively low, and pressure under the same conditions could be realized using high rotating speed or big impeller diameter, and be increased
Impeller diameter receives the limitation in space, improves rotating speed and increases noise again, and in the Ye Daonei of blade, since flow blockage is tight
Weight is easy to form vortex, influences wind turbine outlet air, and due to the presence of whirlpool, increase the eddy current crack of wind turbine.
Invention content
It is an object of the invention to overcome the above-mentioned prior art, a kind of two-way multi-wing centrifugal of single side air inlet is provided
Draught fan impeller, the impeller can effectively improve the air quantity of multi-wing centrifugal fan, reduce blade surface pressure fluctuation and leaf road
Eddy current crack.
In order to achieve the above objectives, the two-way multi-wing centrifugal fan impeller of single side air inlet of the present invention includes wheel disc and position
In lower leave, upper layer blade, the first wheel cap, the second wheel cap and third wheel cap on wheel disc, wherein the first wheel cap, lower layer's leaf
Piece, the second wheel cap, upper layer blade and third wheel cap are sequentially distributed from top to bottom, and the circumferentially cloth of each blade in lower leave
It sets, circumferentially, and upper layer blade and lower leave are radially symmetrical for each blade in the blade of upper layer, and upper layer
The stagger angle β of blade1It is 70 ° -90 °, the exit installation angle β of lower leave2It is 150 ° -180 °;Each leaf in the blade of upper layer
Piece is forward curved vane, and each blade in lower leave is backward leaning vane.
The height of upper layer blade and lower leave ratio K is 0.6-1.
The quantity of upper layer blade intra vane is 30-60 pieces, and the quantity of lower leave intra vane is 30-60 pieces.
Impeller is installed on the middle position in air duct in the two-way multi-wing centrifugal fan of single side air inlet.
The axial cross section contour line of upper layer blade and the symmetrical mirror image of the axial cross section contour line of lower leave are distributed, and
Corresponding line of symmetry is from the center of circle of impeller axial cross section to the line of wheel bottom endpoint.
Setting:Using the right-hand rule as foundation, the direction that fan inlet is axially directed to impeller is denoted as impeller and is rotated in the forward direction
Direction, conversely, be then denoted as impeller reverse rotation direction;Wherein, antecurvature leaf can be presented when motor rotates forward for upper layer blade
The performance of backward leaning vane can be presented in motor reversal for the performance of piece, upper layer blade;Lower leave can when motor rotates forward
The performance of backward leaning vane is presented, the performance of forward curved vane can be presented in motor reversal for lower leave.
β1It is 70 °, β2It is 160 °, the height ratio k=0.85 of upper layer blade and lower leave.
The invention has the advantages that:
The two-way multi-wing centrifugal fan impeller of single side air inlet of the present invention includes upper layer blade and lower leave, wherein
Each blade in the blade of upper layer uses forward curved vane, and each blade in lower leave uses backward leaning vane, to be rotated forward in motor
And forward curved vane pressure coefficient is high, discharge coefficient is big feature and backward leaning vane efficiency can be given full play in Umklapp process
The feature high, pressure coefficient is low and noise is small, makes multi-wing centrifugal fan aeroperformance get a promotion, while reducing blade surface
Pressure fluctuation and vortex tape flow noise, and make impeller positive and negative rotation that there is almost the same aeroperformance, meet in life
Actual demand, simple in structure, practicability is extremely strong.
Description of the drawings
Fig. 1 is the oblique sectional view of existing bathroom air exchanging device;
Fig. 2 is the schematic diagram of existing bathroom air exchanging device multi-wing centrifugal fan impeller;
Fig. 3 is the structural schematic diagram of the present invention;
Fig. 4 is the side view of the present invention;
Fig. 5 is the comparison diagram of upper layer blade 5 and 4 cross-sectional profiles of lower leave of the present invention;
Fig. 6 is the structural schematic diagram of the two-way multi-wing centrifugal fan based on the present invention;
Fig. 7 is the sectional view of the two-way multi-wing centrifugal fan based on the present invention.
Wherein, 1 it is the first wheel cap, 2 be the second wheel cap, 3 be third wheel cap, 4 be lower leave, 5 be upper layer blade, 6 is
Wheel disc.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings:
With reference to figure 3 and Fig. 4, the two-way multi-wing centrifugal fan impeller of single side air inlet of the present invention includes wheel disc 6 and position
In lower leave 4, upper layer blade 5, the first wheel cap 1, the second wheel cap 2 and third wheel cap 3 on wheel disc 6, wherein the first wheel cap 1,
Lower leave 4, the second wheel cap 2, upper layer blade 5 and third wheel cap 3 are sequentially distributed from top to bottom, and each leaf in lower leave 4
Circumferentially, circumferentially, and upper layer blade 5 and lower leave 4 are radially right for each blade in upper layer blade 5 for piece
Claim distribution, and the stagger angle β of upper layer blade 51It is 70 ° -90 °, the exit installation angle β of lower leave 42It is 150 ° -180 °;
Each blade in upper layer blade 5 is forward curved vane, and each blade in lower leave 4 is backward leaning vane.Preferably, β1For
70 °, β2It is 160 °, the height ratio k=0.85 of upper layer blade 5 and lower leave 4.
The height ratio K of upper layer blade 5 and lower leave 4 is 0.6-1;The quantity of 5 intra vane of upper layer blade is 30-60 pieces,
The quantity of 4 intra vane of lower leave is 30-60 pieces;The axial cross section contour line of upper layer blade 5 is axial horizontal with lower leave 4
The symmetrical mirror image distribution of cross section contour, and corresponding line of symmetry is from the center of circle of impeller axial cross section to wheel bottom endpoint
Line.
Setting:Using the right-hand rule as foundation, the direction that fan inlet is axially directed to impeller is denoted as impeller and is rotated in the forward direction
Direction, conversely, be then denoted as impeller reverse rotation direction;Wherein, antecurvature leaf can be presented when motor rotates forward for upper layer blade 5
The performance of backward leaning vane can be presented in motor reversal for the performance of piece, upper layer blade 5;The energy when motor rotates forward of lower leave 4
The performance of backward leaning vane is enough presented, the performance of forward curved vane can be presented in motor reversal for lower leave 4.
With reference to figure 3 and Fig. 4, the upper layer blade 5 is close to current collector, and lower leave 4 is close to motor.
With reference to figure 6 and Fig. 7, impeller is installed on the middle position in air duct in the two-way multi-wing centrifugal fan of single side air inlet, double
It is located at the front of impeller, and blowing mouth from the spacing between blowing mouth and ventilation mouth and impeller to multi-wing centrifugal fan and ventilation mouth
It is identical.
Emulation experiment
Using ANSYS-FLUENT commercial CFD softwares, numerical solution three-dimensional averaged Navier-Stokes equation group,
The air quantity of the comparative analysis single side air inlet two-way multi-wing centrifugal fan impeller and radial impeller, model are more from Domestic ventilation device
Wing centrifugal blower, the number of blade are 30, profile ID 130mm, impeller outer diameter 165mm, it is contemplated that blower interior flows horse
Conspicuous number is less than 0.3, is regarded as potential flows, and turbulence model is k- ε models.In equation is discrete, convective term is using high
Resolution format;Viscosity term uses second-order central format;Time-derivative item uses after second order to Euler scheme.The air interchanger mould
Type is single sided entry, while conditions setting for convenience, and the inlet and outlet section of wind turbine is appropriately extended;Import is given total
Pressure is zero-sum axial admission condition, and exit static pressure zero, wall surface satisfaction is without slip boundary condition, and sound interface is according to multiple ginseng
It is the processing of (Multiple Reference Frame, MRF) method to examine, and import basin and spiral case basin are all made of static coordinate
System, impeller basin is described using rotating coordinate system.By the mathematical calculation model, the multi-wing centrifugal fan of calculating is quiet in outlet
Maximum quantity of wind when pressure is zero, result are that the air quantity of the two-way multi-wing centrifugal fan of single side air inlet using the present invention is 205m3/ h,
And use the air quantity under radial blade for 170m3/ h, the present invention increase 35m compared to traditional centrifugal blower air quantity3/h。