CN204458517U - There is the reversible Axial Fan Blades of blowing groove - Google Patents
There is the reversible Axial Fan Blades of blowing groove Download PDFInfo
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- CN204458517U CN204458517U CN201520065144.5U CN201520065144U CN204458517U CN 204458517 U CN204458517 U CN 204458517U CN 201520065144 U CN201520065144 U CN 201520065144U CN 204458517 U CN204458517 U CN 204458517U
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- blade
- suction surface
- blowing groove
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- blowing
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Abstract
The utility model discloses a kind of reversible Axial Fan Blades with blowing groove, comprise the blade be made up of petiole and blade; At least two blowing grooves are along the circumferential direction offered at the top of blade, and blowing groove is distributed on leaf top surface, by vane tip profile pressure face and suction surface UNICOM.The groove of this symplex structure utilizes the higher pressure difference of pressure side, suction surface in groove, form air-flow from pressure side to suction surface, is blown down by the eddy current streamwise of suction surface.The groove that the utility model is offered at blade top can maintain the spiral structure of vane tip suction surface but reduces the flow strength of import circulation and leaf top suction surface axial vortex thus reach the total pressure efficiency reducing eddy current loss and frictional loss raising ventilator, reaches energy-saving and cost-reducing object.Computer Numerical Simulation shows: reversible propeller fan total pressure efficiency can improve 3 ~ 5%, and manufacture cost reduces about 10%.
Description
Technical field
The utility model belongs to fluid machinery technical field, relates to a kind of reversible Axial Fan Blades with blowing groove.
Background technique
Reversible propeller fan refers to: the ventilator being provided with the blade wheel structure of symmetry or antisymmetry aerofoil profile, under design speed, no matter to rotate forward or counterrotating ventilator has identical air dynamic behaviour, namely there is the aerodynamic parameters such as identical pressure, flow, power, efficiency.This special characteristics of reversible ventilation fan makes compared with the propeller fan of equal plane No., and the total head of reversible fan, flow and total pressure efficiency are all very low, and power consumpiton is very large.In order to improve the aeroperformance of reversible ventilation fan, now widely used reversible propeller fan overwhelming majority vane tip both sides are all provided with anti-surge ring device.
According to the design theory of propeller fan, the symmetrical airfoil that reversible ventilation fan adopts or antisymmetry aerofoil profile do not have acting ability, and when namely adopting the vane rotary of this blade shape, axial plane flowing does not have the ability producing pressure and flow.Why actual reversible axial fan impeller can do work, and is exactly that in the relative flowing of the leaf top inlet side suction surface in blade path, air-flow has a very large spiral structure.The existence of this spiral structure makes the air-flow entering impeller enter impeller from the radial position that radius is little, impeller is left in the radial position large from radius, thus obtaining the lifting of the through-flow section increase of runner and static pressure, centrifugal inertial force power also participates in doing work and makes gas-static raise further simultaneously.The existence of this spiral structure makes symmetry or antisymmetry axial flow blade profile ventilator define the meridian plane acceleration effect of flowing thus be provided with acting ability.In order to maintain this stable spiral structure, usual reversible propeller fan is provided with anti-surge ring in the casing position of vane tip both sides.The existence of anti-surge ring improves the acting ability of reversible ventilation fan, but creates increasing considerably of additional energy loss and manufacture cost thereupon.
Model utility content
The purpose of this utility model is to solve above-mentioned the problems of the prior art, a kind of reversible Axial Fan Blades with blowing groove is provided, the utility model eliminates the two-way anti-surge ring device of vane tip both sides, simplify the structure of ventilator, the aditional energy loss because anti-surge ring device produces can also be reduced further except significantly reducing manufacture cost.
To achieve these goals, the technological scheme that the utility model adopts is:
There is the reversible Axial Fan Blades of blowing groove, comprise the blade be made up of petiole and blade; At least two blowing grooves are along the circumferential direction offered at the top of blade, and blowing groove is distributed on leaf top surface, by vane tip profile pressure face and suction surface UNICOM.
Described blowing groove is the groove of some symplex structures.
The described blowing groove degree of depth is radially less than or equal to the radius of vortex yardstick on vane tip suction surface.
The width of described blowing groove is 2.5 ~ 10mm, and the degree of depth is 10 ~ 50mm.
In the same way, and the spacing between the center line of each blowing groove width direction is 5 ~ 30mm to the circumferencial direction that the center line of described blowing groove width direction and blower fan rotate.
The top of described blade offers 2 ~ 10 blowing grooves.
Compared with prior art, the utility model has following beneficial effect:
The utility model along the circumferential direction offers some blowing grooves at the top of the blade of blade, the groove of this symplex structure utilizes the higher pressure difference of pressure side, suction surface in groove, form air-flow from pressure side to suction surface, by suction surface eddy current streamwise blow down.The groove that the utility model is offered at blade top can maintain the spiral structure of vane tip suction surface but reduces the flow strength of import circulation and leaf top suction surface axial vortex thus reach the total pressure efficiency reducing eddy current loss and frictional loss raising ventilator, reaches energy-saving and cost-reducing object.The utility model eliminates the two-way anti-surge ring device of vane tip both sides, simplifies the structure of ventilator, can also reduce the aditional energy loss because anti-surge ring device produces except significantly reducing manufacture cost further.Computer Numerical Simulation shows: reversible propeller fan total pressure efficiency can improve 3 ~ 5%, and manufacture cost reduces about 10%.
Accompanying drawing explanation
Fig. 1 the utility model embodiment 1 has the reversible propeller fan antisymmetry blade three-view diagram of 3 leaf top blast air drains, and wherein Fig. 1 (a) is plan view, and Fig. 1 (b) is side view, and Fig. 1 (c) is plan view;
The axonometric drawing of Fig. 2 the utility model blade;
Fig. 3 is without speed vector figure near the blade surface of leaf top blast air drain and air inlet side casing;
Fig. 4 is without local velocity's vector diagram near the blade surface of leaf top blast air drain and air inlet side casing;
Fig. 5 is out speed vector figure near the blade surface of leaf top blast air drain and air inlet side casing;
Fig. 6 is out local velocity's vector diagram near the blade surface of leaf top blast air drain and air inlet side casing;
Fig. 7 is the reversible propeller fan antisymmetry blade three-view diagram that the utility model embodiment 2 has 4 leaf top blast air drains, and wherein Fig. 7 (a) is plan view, and Fig. 7 (b) is side view, and Fig. 7 (c) is plan view;
Fig. 8 is the reversible propeller fan antisymmetry blade three-view diagram that the utility model embodiment 3 has 10 leaf top blast air drains, and wherein Fig. 8 (a) is plan view, and Fig. 8 (b) is side view, and Fig. 8 (c) is plan view.
Wherein: 1 is petiole; 2 is blade; 3 is blowing groove; 4 is leaf top suction surface axial vortex; 5 is import circulation.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in more detail:
See Fig. 1 and Fig. 2, the utility model comprises the blade be made up of petiole 1 and blade 2, and 2 ~ 10 blowing grooves 3 are along the circumferential direction offered at the top of blade 2, and blowing groove 3 is distributed on leaf top surface, by vane tip profile pressure face and suction surface UNICOM.Blowing groove 3 is the groove of some symplex structures.Blowing groove 3 degree of depth is radially less than or equal to the radius of vortex yardstick on power face.The width of blowing groove 3 is 2.5 ~ 10mm, and the degree of depth is 10 ~ 50mm.The circumferencial direction that the center line of blowing groove 3 width direction and blower fan rotate in the same way.
Principle of the present utility model:
Due to the constraint of cylindrical casing barrel, the partial blade in the annular region of vane tip suction side does not have meridian section accelerating ability, does not namely have acting and obtain static pressure to rise ability.Therefore, air-flow also just cannot enter blade path from this part region of vane tip, thus the suction side induction before air-flow enters the top of impeller creates the import circulation identical with vane rotary direction and leaf top suction surface axial vortex fluidal texture.The radial dimension of this annular region is different according to the difference of reversible ventilation fan full design pressure.The existence of import circulation is that reversible propeller fan leaf top is necessary without inlet air conditions, also results in the existence of leaf top suction surface axial vortex also with very large energy loss and aerodynamic noise without inlet air conditions.
As shown in Figure 1, in order to not only keep the existence of leaf top suction surface axial vortex structure but also weaken the intensity of leaf top suction surface axial vortex, with reach reduce eddy current loss and wall friction loss improve reversible propeller fan total pressure efficiency, reduce eddy current produce aerodynamic noise.The utility model is taked vane tip along the circumferential direction to open and is got leaf top blast air drain method by leaf roof limb type pressure side and suction surface UNICOM.The groove of this symplex structure utilizes the higher pressure difference of pressure side, suction surface in groove, form air-flow from pressure side to suction surface, by suction surface eddy current streamwise blow down.In order to ensure that improving aerodynamic performance does not affect blade stiffness again, the general fluting degree of depth is radially the radius value being less than or equal to vortex yardstick on power face.The quantity of fluting is depending on vane tip chord length, it is unimpeded to ensure the flowing in groove that groove should have enough width, generally according to the size of reversible ventilation fan physical dimension, by vane tip chord length, circumference symmetrically opens 2 ~ 10 grooves, the width of blowing groove is 2.5 ~ 10mm, and the degree of depth of blowing groove is 10 ~ 50mm.Because groove structure is geometry symmetry, therefore no matter how sense of rotation all can ensure that the entirely reversible of aeroperformance.
The employing of reversible propeller fan leaf top blast tank structure, reduce flow losses improve except the flow efficiency of reversible ventilation fan except reducing import circulation strength and leaf top suction surface axial vortex intensity thus reaching, also eliminate the anti-surge ring of casing both sides, leaf top, simplify housing construction, manufacture cost significantly reduces.Computer Numerical Simulation shows: reversible propeller fan total pressure efficiency can improve 3 ~ 5%, and manufacture cost reduces about 10%.
Enumerate several specific embodiment of the present utility model below:
Embodiment 1
The present embodiment is the reversible Axial Fan Blades with blowing groove, comprises petiole 1, blade 2 and blowing groove 3.
Reversible Axial Fan Blades is used for the reversible propeller fan of diameter D=2m, this reversible axial fan impeller working speed n=980r.m.p, design discharge Q=60m
3/ s, full design pressure P=950Pa, impeller blade quantity Z=10, vane tip chord length L=250mm, hub ratio k=0.45.Leaf top established angle β
an=15 °.
Backed down 3 blowing grooves 3 at the leaf of this reversible Axial Fan Blades, the circumferencial direction that the center line of each blowing groove width direction and blower fan rotate in the same way.Leaf top is positioned at blade 2 top.In the present embodiment, blowing groove has 3, and the width of each blowing groove is 5.5mm, and the degree of depth of each blowing groove is 25mm.
Each blowing groove, by circumferential Central Symmetry, is distributed on leaf top surface.In the present embodiment, 3 blowing grooves are distributed on leaf top surface, and making middle blowing groove be positioned at the center of this blade and blade top surface place aerofoil profile, the both sides being distributed in middle blowing groove of all the other two blowing groove symmetries, the spacing between the center line of each blowing groove width direction is 20.5mm.
The petiole 1 of reversible Axial Fan Blades and the structure of blade 2 all adopt prior art, are fixed on wheel hub by the blade angle of design.
For verifying the effect of the present embodiment, by the blade not opening leaf top blast air drain of same aerodynamic parameter, geometric parameter, the number of blade and working speed as a comparison object carried out detailed computer numerical flow analysis.
Fig. 3 and Fig. 5 is the reversible propeller fan suction side front view of diameter 2 meters.Under depicting the same terms in view, the velocity distribution on blade suction surface and air inlet catchment port.The velocity distribution of blade surface adopts relative velocity vector representation, and adopt absolute velocity vector representation near air inlet catchment port and casing, impeller rotates in the direction of the clock.
In Fig. 4 and Fig. 6, the import circulation partial enlargement speed vector figure that sets forth out the axial vortex on leaf top blast air drain and Kai Ye top blast air drain rear blade top suction surface and induced by leaf top suction surface axial vortex.In Fig. 4, simulate out velocity vector near the blade surface of leaf top blast air drain and air inlet side casing, in Fig. 6, simulate velocity vector near axial vortex on the vane tip suction surface having leaf top blast air drain and the import circulation 5 of being induced by leaf top suction surface axial vortex 4 and blade surface and air inlet side casing.
Leaf top suction surface axial vortex 4 refers to indicated by Fig. 4 lower half portion 4, the spiral structure of the gas represented by velocity vector on blade.Import circulation 5 refers to the air-flow being positioned at neighbouring with casing and identical with the wheel rotation direction High Rotation Speed of the anterior air inlet catchment port of blade air inlet that Fig. 4 upper half part 5 indicates.
For verifying effect of the present utility model, numerical simulation is carried out to the present embodiment.The result of numerical simulation shows:
1. the result of comparison diagram 4 and Fig. 6: under identical backpressure condition, the axial vortex intensity opened on the vane tip suction surface of leaf top blast air drain significantly weakens.The distribution of blade pressure surface, suction surface overdraught is more reasonable, and the flow resistance that air-flow enters blade significantly reduces, and flow increases by 5 ~ 8%.
2. the result of comparison diagram 3 and Fig. 5 can be found out: scope and the intensity of the import circulation 5 of leaf top suction surface axial vortex 4 induction reduce, circular velocity is declined to a great extent, the flowage friction of intake grill catchment port near wall is lost, is reduced around kinetic energy rejection, and intake efficiency improves.
3., because the present embodiment improves the inlet air conditions that air-flow enters blade path, therefore can cancel the anti-surge ring device of barrel both sides, leaf top, manufacture cost significantly reduces.
4. reversible propeller fan total pressure efficiency improves 3 ~ 5% under condition on year-on-year basis, reaches energy-saving and cost-reducing object.
The utility model gives embodiment 2 to 6.Embodiment 2 is identical with the structure of reversible Axial Fan Blades in embodiment 1 with the structure of the reversible Axial Fan Blades in 3, and concrete structure is see Fig. 7 and Fig. 8.The technical parameter of all the other embodiments is in table 1.
Table 1
Above content is only and technological thought of the present utility model is described; protection domain of the present utility model can not be limited with this; every technological thought according to the utility model proposes, any change that technological scheme basis is done, within the protection domain all falling into the utility model claims.
Claims (6)
1. there is the reversible Axial Fan Blades of blowing groove, it is characterized in that: comprise the blade be made up of petiole (1) and blade (2); At least two blowing grooves (3) are along the circumferential direction offered at the top of blade (2), and blowing groove (3) is distributed on leaf top surface, by vane tip profile pressure face and suction surface UNICOM.
2. the reversible Axial Fan Blades with blowing groove according to claim 1, is characterized in that: the groove that described blowing groove (3) is some symplex structures.
3. the reversible Axial Fan Blades with blowing groove according to claim 1, is characterized in that: described blowing groove (3) degree of depth is radially less than or equal to the radius of vortex yardstick on vane tip suction surface.
4. the reversible Axial Fan Blades with blowing groove according to claim 1, is characterized in that: the width of described blowing groove (3) is 2.5 ~ 10mm, and the degree of depth is 10 ~ 50mm.
5. the reversible Axial Fan Blades with blowing groove according to claim 1, it is characterized in that: in the same way, and the spacing between the center line of each blowing groove width direction is 5 ~ 30mm to the circumferencial direction that the center line of described blowing groove (3) width direction and blower fan rotate.
6. the reversible Axial Fan Blades with blowing groove according to claim 1, is characterized in that: the top of described blade (2) offers 2 ~ 10 blowing grooves (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520065144.5U CN204458517U (en) | 2015-01-29 | 2015-01-29 | There is the reversible Axial Fan Blades of blowing groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520065144.5U CN204458517U (en) | 2015-01-29 | 2015-01-29 | There is the reversible Axial Fan Blades of blowing groove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204458517U true CN204458517U (en) | 2015-07-08 |
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ID=53665411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520065144.5U Expired - Fee Related CN204458517U (en) | 2015-01-29 | 2015-01-29 | There is the reversible Axial Fan Blades of blowing groove |
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| Country | Link |
|---|---|
| CN (1) | CN204458517U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613009A (en) * | 2015-01-29 | 2015-05-13 | 苏莫明 | Reversible axial flow fan blade with air blowing grooves |
-
2015
- 2015-01-29 CN CN201520065144.5U patent/CN204458517U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613009A (en) * | 2015-01-29 | 2015-05-13 | 苏莫明 | Reversible axial flow fan blade with air blowing grooves |
| CN104613009B (en) * | 2015-01-29 | 2017-04-19 | 苏莫明 | Reversible axial flow fan blade with air blowing grooves |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20180129 |