CN108361224A - The equivalent axial flow blower aerofoil profile of forward and reverse rotation aerodynamic property retention - Google Patents
The equivalent axial flow blower aerofoil profile of forward and reverse rotation aerodynamic property retention Download PDFInfo
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- CN108361224A CN108361224A CN201810207969.4A CN201810207969A CN108361224A CN 108361224 A CN108361224 A CN 108361224A CN 201810207969 A CN201810207969 A CN 201810207969A CN 108361224 A CN108361224 A CN 108361224A
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- 230000014759 maintenance of location Effects 0.000 title claims abstract description 6
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- 210000003205 muscle Anatomy 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 10
- 230000005611 electricity Effects 0.000 description 5
- 230000009466 transformation Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A kind of axial flow blower aerofoil profile that the property retention of forward and reverse rotation aerodynamic is equivalent, its aerofoil profile is all made of holohedral symmetry streamline profile at each calculating section, vane airfoil profile contour line and profile mean line are symmetrical, and it is also symmetrical with the vertical line by profile mean line midpoint, and the vertical axle sleeve center line of each central point line of blade profile and pass through the midpoint of axle sleeve center line.The aerofoil profile matches for identical capacity, same rotational speed, the different motor turned to, both it was used for right handed motor, also it is used for the motor of left-handed rotation, and air quantity, the wind pressure value provided can keep equal, moreover it is possible to which realizing flow direction of the air-flow in motor casing radiating ribs also can keep identical.
Description
Technical field
It is specifically a kind of for the outer cooling wind of electric motor machine the present invention relates to a kind of technology in axial flow blower field
Fan uses for electric rotating machine forward or backwards, and fan wind turbine aeroperformance keeps equivalent axial-flow fan blade aerofoil profile, i.e.,
Using the same impeller, it can realize that air quantity, wind pressure are constant for left-hand or the use of dextrad electric rotating machine, air-flow is relative to motor machine
The flow direction of shell can also remain unchanged.
Background technology
Three-phase alternating-current motor has a large capacity and a wide range, and domestic gross annual output amount reaches billions of KW, if improving electric efficiency 1%, per year
Operation is counted for 4000 hours, year amount of electricity saving up to 40,000,000,000 KWh or more, be an extremely considerable number, generaI investigation finds cooling outside motor machine
For ventilating system there is the serious drawback of waste of energy, wasting historical reasons have following three：
1, fan efficiency in Motor Ventilation Cooling System is relatively low to be well-known, and motor manufactory is mainly in view of
The direction of rotation of alternating current generator will be determined by the steering of driven equipment, that two kinds of different steerings, i.e. forward or reverse can be met.
The fan blade that previous design is selected, generally use radial direction centrifuge blade is more, can meet the needs rotated and reverse, but this wind
The phenomenon that efficiency is relatively low, and many people know about and are considered " normal " is fanned, lacks and energy saving change is carried out to motor cooling fan blade
The sense of urgency made.
2, fan design, manufacturer are usually more to the relationship research of wind turbine blade profile and efficiency.Cooling fan will be met
Way traffic understanding is more, to being regarded as reasonably using radial blade, it is believed that cannot change blade profile, low efficiency is blade profile original
Cause, lack scientific and technical innovation consciousness, always consider that transformation difficulty is big, of high cost, there are no people from system optimization carry out reducing energy consumption depth
Enter to consider.
3, the beginning of the eighties in last century Qinhua Univ., Beijing and this seminar once used single direction rotation high-efficiency axial-flow blower blade instead,
It all confirms can save energy, but because different steer motors will exchange the impeller of different steerings, then in Motor Production Test, two need to be provided
The wind wheels that difference turns to, this causes manufacturing cost to increase, therefore the enthusiasm promoted is not high, and promotion efficiency is limited, as from ventilation
System is started with, and the understanding that reduction systemic effect influence value, reduction system resistance are reduced to minimumization is also insufficient, lacks research promotion
Enthusiasm.
Above three reason cause motor cooling-fan installation fail for a long time carry out reducing energy consumption, last up to 30 years it
Long, there is the lasting serious waste energy.Seminar feels duty-bound deeply, and registration study is wanted in proposition.
Two-pole machine is because rotating speed is high, motor volume is relatively small, flow velocity is relatively higher between casing radiating ribs, drag losses are inclined
Greatly, amount of electricity saving is relatively large after transformation, after engineered, it was demonstrated that motor efficiency can be improved up to 3%；The larger section of quadrupole motor volume
Electricity is between 1.5~2%.Electromechanics trade technical staff so far pays close attention to not enough motor radiating fan fallback, lacks and changes
The sense of urgency made, not yet finding innovative development so far can assemble for two kinds of different steering motors using same blast fan,
And wind pressure, air quantity keep identical, and cooling fan airflow direction identical can will match two not so as to terminate electrical machinery plant in the past
The drawbacks of with steering impeller to user.
Invention content
The present invention is directed to deficiencies of the prior art, proposes a kind of forward and reverse rotation aerodynamic property retention etc.
Same axial flow blower aerofoil profile calculates through analysis according to the structural parameters of new aerofoil and obtains the angle of attack-lift coefficient curve, for transformation
Foundation is provided with optimization blade design；Holohedral symmetry Airfoil Design is utilized after testedImpeller measures blower press effect
Rate is up to 80% or so.
The present invention is achieved by the following technical solutions：
The equivalent axial flow blower aerofoil profile of forward and reverse rotation aerodynamic property retention of the present invention, aerofoil profile is each
Calculate section at be all made of holohedral symmetry type aerofoil profile, vane airfoil profile contour line and profile mean line are symmetrical, and with by profile mean line
The vertical line of point is also symmetrical, and the vertical axle sleeve center line of each central point line of vane airfoil profile and passes through the midpoint of axle sleeve center line.
The holohedral symmetry aerofoil profile refers to：There are two orthogonal mirror axis on section for the aerofoil profile.
The lift coefficient C of the fan bladeyValue is 0.3~0.65, and flow pattern index ∝ is -0.10~+0.20.
The aerofoil profile of the fan blade is different from conventional blower aerofoil profile, because its center line of conventional aerofoil profile is using arc-shaped or throwing
Object line style, and the profile mean line that the present invention uses is straight line, and aerofoil profile leading edge and trailing edge are the small arc-shaped of same radius, and with
The vertical line of center line is also symmetrical；It is different from conventional Low Speed Airfoil, the latter's leading edge in round end, rear be it is sharp, commonly referred to as before
Fine stern after round end.
The present invention relates to the axial flow blowers that a kind of forward and reverse rotation air quantity, wind pressure are constant, including at least two panels is with above-mentioned
The blade of aerofoil profile.
Kuppe and current-collecting device of air inlet are equipped with before the axial flow fan vane wheel, wherein current-collecting device of air inlet is set to electricity
On machine protective cover rear end face at outer diameter.
The current-collecting device of air inlet be two-flap type structure and it is internal there is annular runner, air after impeller discharge,
The changeover portion runner for being equipped with gradual change speed in this changeover portion before into motor radiating muscle, being gradually oriented to.
The end air outlet section of the motor shield and air-flow have just enter into motor radiating muscle section using gradual change speed
Flow passage structure, the runner design is using this pungent base curves (flowing contraction section molded line) equation of Vito.
Technique effect
Compared with prior art, the present invention is same using can also be used for orientation reversion motor assembly for orientation rotating forward
High-efficiency blade impeller；By installing current collector additional in air inlet, and outlet side is designed in gradual change speed, gradual change to runner, to also
Optimize the uniformity that airflow field is improved in flow field；The present apparatus can realize that drop resistance is energy saving to greatest extent and ensure impeller makees function
Power.
To different steering motors, cooling fan stretches place mounted in electric motor back shaft, and cooling air flow direction should all be by motor tail
Direction flowing is stretched along motor front axle by portion, and taking method is removed from stretching cooling fan from electric motor back shaft, and u-turn is still mounted on electricity
Machine rear axle stretches place, when motor changes the airflow direction turned to when postcooling fan airstream direction remains to maintain to turn to originally.
Description of the drawings
Fig. 1 is schematic diagram of the motor cooling using axis of total symmetry axial flow fan blade aerofoil profile of the present invention；
Fig. 2 is that the present invention improves wing section lift coefficient-angle of attack performance diagram；
Fig. 3 is that embodiment cooling fan respectively calculates the chord length at radius, blade angle schematic diagram；
Fig. 4 is current blower fan structure schematic diagram；
In figure：1 open type radial blade, 2 protective covers；
The axial flow blower structural schematic diagram that Fig. 5 is forward and reverse rotation air quantity of the present invention, wind pressure is constant；
In figure：3 blades, 4 wheel hubs, 5 current collectors, 6 motor shields, 7 changeover portions；
Fig. 6 is to flow contraction section molded line schematic diagram for designing using this pungent base curves equation of Vito；
Fig. 7 is blade and wheel hub schematic diagram in Fig. 5.
Specific implementation mode
The present embodiment is summarized with 100kw 2P (pole) motor shaft stream cooling aerofoil fan blade profile Pneumatic Calculation result, air quantity
3600m3/ h, total head 200Pa, rotating speed 2900rpm, number of blade Z=5.
As shown in Figure 1, the percentage for the aerofoil profile chord length that the present embodiment is related to is listed, analyzes and reduce front and rear edge air-flow point
From proposition coordinate dimension is as follows, unit mm：
Table 1
| X | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| ±Y | R1.6 | 3.0 | 3.91 | 4.52 | 4.92 | 5.00 | 4.92 | 4.52 | 3.91 | 3.0 | R1.6 |
As shown above, which is all made of holohedral symmetry streamline profile, vane airfoil profile size at each calculating section
It is indicated with the percentage of chord length, contour line is symmetrical with profile mean line and also also right with the vertical line by profile mean line midpoint
Claim.X-axis and Y-axis in figure are orthogonal two mirror axis of the aerofoil profile.
Two endpoints of the aerofoil profile are R=1.6mm circular arcs on airfoil center line, and with aerofoil profile main body front and back end
Contour line it is tangent.
In the present embodiment, in order to use for reference the performance before airfoil stall point, i.e., in Cymax(lift coefficient) reaches near maximum value
Performance.To relatively thin aerofoil profile, due to leading-edge radius very little, when the angle of attack is not very big, laminar flow side will occur near leading edge
The separation of dividing value, the lift coefficient deviation straight line in view of thin airfoil is quite early, CymaxValue is also at a fairly low, and typically less than 1, but
Using C before and after stallyCurvilinear motion is not continuously to fall suddenly, is applicable to compared with Low speed electric motor cooling fan aerofoil profile
Design.
To 4 pole of low speed and 6 pole motors, require to select higher C since rotating speed is relatively relatively low, when pneumatic designymaxValue,
Thicker aerofoil profile (profile thickness be more than 12%) should be selected, using fate thereafter from development be that comparison is slow, it can be utilized
It when detaching not very serious, can also be increased with the increase Cy of the angle of attack, only be risen caused by same angle of attack value added
Increment (Δ C when force coefficient increment is than low incidencey) value reduced, the slope of lift curve gradually decrease but can utilize its
Reach this pervious section of maximum value.
The present embodiment aerofoil profile front and rear edge is preferably all made of same radius R=1.6% chord lengths.
As shown in table 2, beCooling fan under the technology of rotation speed of fan 2900r/min requires respectively calculates half
Chord length at diameter, the signal of leaf angle, concrete numerical value is as shown in table 2 and Fig. 3：
Table 2
| Serial number | Radius (mm) | Chord length (mm) | Established angle |
| No.1 | 170 | 56.40 | 25.80 |
| No.2 | 160 | 58.30 | 26.64 |
| No.3 | 150 | 60.10 | 27.91 |
| No.4 | 140 | 61.40 | 29.08 |
| No.5 | 130 | 63.30 | 30.69 |
| No.6 | 120 | 65.70 | 32.57 |
| No.7 | 110 | 68.40 | 34.32 |
| No.8 | 100 | 72.30 | 35.27 |
| No.9 | 90 | 77.40 | 35.54 |
Note：Established angle=flow angle+angle of attack.
Fig. 2 is the lift efficiency curve of symmetrical airfoil of the present invention, and A is compared with the spy of thick wing type (relative thickness 10%) in figure
Property, B is compared with the characteristic of thin airfoil (relative thickness 6%), and to compared with thick wing type, relative thickness can be more than 16%, characteristic is bent
C in lineymaxValue can higher.
Fig. 3 is holohedral symmetry airfoil fan schematic diagram of the present invention.
Fig. 4 is before transformation with blower fan structure schematic diagram.
As shown in figure 5, for the constant axial flow blower structural schematic diagram of the present embodiment forward and reverse rotation air quantity, wind pressure, the wind
Machine includes the blade 3 that at least two panels has above-mentioned aerofoil profile.
Protective cover 6 and current-collecting device of air inlet 5 are equipped with outside the axial flow blower successively, wherein：Current-collecting device of air inlet 5 is set
6 end face of motor shield is placed at outer diameter.
5 runner annular in shape of current-collecting device of air inlet, air from impeller be discharged, into radiating ribs before be equipped with gradual change speed,
The changeover portion runner 7 being gradually oriented to.
The end air outlet section of the motor shield and air-flow use gradual change between having just enter into motor radiating muscle section
Fast flow passage structure, motor cooling fan outlet ring-shaped section and ring-shaped runner, into the gradual change of gradual change speed to runner；The gradual change speed runner
Structure meets this pungent base curves equation of Vito as shown in Figure 6.
This pungent base curves equation of the Vito, i.e., the corresponding arc radius R at any X under reference axisWhen, according to along axis
Flow area can be acquired to the actual size at different X values, the equivalent radius R at inlet and outlet two is first calculated as followsWhen 1With
RWhen 2,In formula：N radiating ribs quantity, Z are radiating ribs thickness (m), and δ is radiating ribs height
(m), then press in discharge area calculate RWhen 2And RWhen 1, the R at different X is then calculated as followsWhenValue,Wherein：RWhen 1For changeover portion tunnel inlets equivalent radius, RWhen 2Go out for changeover portion runner
Mouth equivalent radius, by the R acquiredWhenValue calculates flow area, and runner actual geometry is determined by flow area value tissue.
As shown in fig. 7, by the way that the blade is stretched upper extraction from electric motor back shaft, 180 ° are rotated, u-turn installation can be realized
It is constant in right-hand rotation motor or with capacity and with the flow direction of rotating speed left-hand rotation motor overdraught and air quantity, wind pressure.
Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the principle of the invention and objective with difference
Mode carry out local directed complete set to it, protection scope of the present invention is subject to claims and not by above-mentioned specific implementation institute
Limit, each implementation within its scope is by the constraint of the present invention.
Claims (11)
1. a kind of axial flow blower aerofoil profile that the property retention of forward and reverse rotation aerodynamic is equivalent, which is characterized in that its aerofoil profile is each
Holohedral symmetry streamline profile is all made of at a calculating section, vane airfoil profile contour line and profile mean line are symmetrical, and with pass through aerofoil profile
The vertical line at center line midpoint is also symmetrical, and the vertical axle sleeve center line of each central point line of blade and passes through the midpoint of axle sleeve center line.
2. aerofoil profile according to claim 1, characterized in that the holohedral symmetry streamline profile refers to:This is wing to cut open
There are two orthogonal mirror symmetry axial symmetry on face, and aerofoil profile front and rear edge is different from conventional airfoil type, and front and rear edge is all
It is constituted with the circular arc of same diameter.
3. aerofoil profile according to claim 1, characterized in that the aerofoil profile maximum thickness is 10~14%, works as the angle of attack
At 3 °~8 °, lift coefficient C is corresponded toyValue is 0.3~0.65.
4. aerofoil profile according to claim 1, characterized in that when fan blade flow pattern designs, CuIn r ∝=constant formula, flow pattern
Index ∝ values take -0.10~+0.20.
5. aerofoil profile according to claim 1, characterized in that the airfoil center point line of the fan blade be straight line and
Pass through the midpoint of axle sleeve section center line.
6. the constant axial flow blower of a kind of forward and reverse rotation air quantity, wind pressure, which is characterized in that there is above-mentioned comprising at least two panels
The blade of aerofoil profile described in one claim.
7. wind turbine according to claim 6, characterized in that be equipped with kuppe and air inlet outside the axial flow blower successively
Mouth current collector, wherein：Current-collecting device of air inlet is set to motor shield end face at outer blade diameter.
8. wind turbine according to claim 6, characterized in that current-collecting device of air inlet runner annular in shape, air is from leaf
Wheel discharge, into radiating ribs before be equipped with gradual change speed, the changeover portion runner that is gradually oriented to.
9. wind turbine according to claim 6, characterized in that the end air outlet section of the motor shield and air-flow
It has just enter into motor radiating muscle section and uses gradual change speed flow passage structure.
10. wind turbine according to claim 9, characterized in that the gradual change speed flow passage structure meets Vito Xin Siji songs
Line equation.
11. wind turbine according to claim 1, characterized in that by the way that the blade is stretched upper pull-out, tuning from electric motor back shaft
180 ° of installations of rotation can be realized in right-hand rotation motor or with capacity and with the flow direction of rotating speed left-hand rotation motor overdraught and
Air quantity, wind pressure remain unchanged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810207969.4A CN108361224A (en) | 2018-03-14 | 2018-03-14 | The equivalent axial flow blower aerofoil profile of forward and reverse rotation aerodynamic property retention |
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| CN201810207969.4A CN108361224A (en) | 2018-03-14 | 2018-03-14 | The equivalent axial flow blower aerofoil profile of forward and reverse rotation aerodynamic property retention |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109681462A (en) * | 2019-01-08 | 2019-04-26 | 扬州大学 | Using the reversible axial-flow pump impeller of ellipse pointed combined-wing type |
| CN114021277A (en) * | 2021-11-02 | 2022-02-08 | 华北电力大学 | Method and system for evaluating dynamic aerodynamic characteristics of wind turbine |
| CN115324929A (en) * | 2022-10-17 | 2022-11-11 | 西门子电机(中国)有限公司 | Motor fan blade and motor fan |
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| CN208057505U (en) * | 2018-03-14 | 2018-11-06 | 上海交通大学 | The equivalent axial flow blower aerofoil profile of forward and reverse rotation aerodynamic property retention |
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