CN102297159B - Axial impeller with vanes and hubs in composite hinge - Google Patents
Axial impeller with vanes and hubs in composite hinge Download PDFInfo
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- CN102297159B CN102297159B CN 201110282216 CN201110282216A CN102297159B CN 102297159 B CN102297159 B CN 102297159B CN 201110282216 CN201110282216 CN 201110282216 CN 201110282216 A CN201110282216 A CN 201110282216A CN 102297159 B CN102297159 B CN 102297159B
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Abstract
The invention discloses an axial impeller with vanes and hubs in composite hinge, comprising the hubs, the vanes and vane joints connected with the connecting ends of the vanes. The axial impeller has the key points that the hubs are provided with at least two composite hinge devices with zero bending moment; each composite hinge device is provided with a vertical shaft hole and a horizontal shaft hole; a joint of double lugs of each hub is hinged with each vertical shaft hole through a vertical shaft; the vane joints are hinged with the horizontal shaft holes through horizontal shafts; the vanes have a downward swinging angle less than or equal to 5 DEG, an upward swinging angle less than or equal to 3 DEG and a left and right swinging angle less than or equal to 3 DEG. In the invention,two bending moments at the roots of the vanes are eliminated, the problem that the roots of the vanes of a large axial flow fan is easy to crack is solved, the structure is optimized, the weight is reduced, the production cost is reduced, the service life of the large axial flow fan is prolonged, and meanwhile, the quality is ensured. The axial impeller in composite hinge can be widely installed and used on equipment such as a large evaporative condenser, a large air-cooling tower and the like.
Description
Affiliated technical field
The present invention relates to the blower fan technical field, specifically a kind of root of blade does not have the large axial flow fan impeller of moment of flexure.
Background technique
The purposes of big air quantity axial-flow blower is extremely extensive.But, this blower fan load is big, blade is long, blade adopts modes such as welding, riveted joint, bolt to carry out fixing to connect usually with wheel hub in addition, thereby impeller is when rotating at a high speed, blade produces two mutually perpendicular moments of flexure under the effect of aerodynamic force, gravity, centrifugal force and resistance of air, reach maximum value at root of blade.This moment of flexure is particularly outstanding on the large scale impeller, so that the structural fracture of blade occurs.Large axial flow fan impeller with diameter 10m is example, and the moment of flexure that root of blade produces Vertical direction just reaches more than the 8000N.m.In order to satisfy the requirement of strength of fan blade, traditional way is very big, very strong with the structural section design of root of blade often, generally will adopt the structural steel joint of the about 100mm of diameter.Thereby the weight of this blower fan is big, the cost of production height.In order to eliminate the moment of flexure of blade, people have done the effort of not understanding.The patent No. is 200520085766.0 utility model patent, a kind of large axial flow fan of zero moment of flexure structure is disclosed, at blade and wheel hub inclination several angle fixedly the time, the blade after the inclination produces the component of centrifugal force and offsets aerodynamic force, reaches the zero moment of flexure effect of blade joint.But because blade joint still adopts the mode of fixedlying connected with wheel hub, when air quantity, blast, rotating speed change, blade just no longer has been in zero moment of flexure state.The patent of invention of number of patent application 201010183142.8, the draught fan impeller of zero moment of flexure structure is disclosed equally, mainly be at wheel hub the hinged seat that constitutes one with wheel hub to be set, constitute the hinging structure of wheel hub and blade, guarantee that under any working state the moment of flexure of blade joint and wheel hub is zero.But this structure has only been eliminated the moment of flexure of Vertical direction, and the moment of flexure that produces in the plane of rotation still exists, thereby is not zero moment of flexure impeller truly.
Summary of the invention
In order to overcome the deficiency that existing large axial flow fan impeller structurally exists, the invention provides a kind of in light weight, cost of production is low, performance is good blade and the compound hinged axial-flow blower of wheel hub.
The technical solution adopted for the present invention to solve the technical problems is: the compound hinged axial-flow blower of this blade and wheel hub, comprise wheel hub, blade and the blade joint that is connected with the blade connecting end, main points are to be provided with quantity at wheel hub to be at least two zero compound splicers of moment of flexure, be provided with connecting groove and mutually perpendicular vertical axis hole and horizontal shaft hole at each compound splicer, ears joint on the wheel hub is hinged by vertical shaft with vertical axis hole, the ears joint is provided with the limited post of excessively swinging about limit blade, blade joint in the connecting groove and horizontal shaft hole are hinged by horizontal axis, and the hinged place is provided with overhanging section that limit blade is excessively swung up and down; Said blade is to angle≤5 of lower swing °, and blade is angle≤3 ° of swing upwards, the angle that blade swings≤3 °.
The present invention compared with prior art, topmost advantage, be by compound splicer vertical shaft and horizontal axis that blade and wheel hub is hinged, compound hinged impeller, when rotating at a high speed, blade is under the synergy of aerodynamic force, gravity, centrifugal force and resistance of air, allow blade to swing up and down around horizontal axis in vertical impeller plane of rotation direction, also allow blade in the impeller plane of rotation, to swing around vertical shaft, when the attitude of blade reaches balance in these power, final stable, make blade in the vertical direction with plane of rotation in the equal vanishing of moment of flexure of both direction.This structure has fundamentally been eliminated the moment of flexure of root of blade, has thoroughly solved the structure difficult problem of traditional large axial flow fan root of blade, designs simplification, weight saving, cost of production descends, and has prolonged large axial flow fan working life, and the reliability of quality is improved.As the impeller of diameter 10m, the size of compound splicer only is 50mm, and the hinging shaft diameter only is 25mm, can satisfy requirement of strength.The present invention can install and use on equipment such as large-scale evaporative condenser, large-scale air cooling device, large cooling column widely.
Description of drawings
Describe the present invention below in conjunction with drawings and Examples:
Fig. 1 is structural representation of the present invention;
Fig. 2 is the A-A sectional structure schematic representation of Fig. 1;
Fig. 3 is the plan structure schematic representation of Fig. 1;
Fig. 4 is working state schematic representation of the present invention.
1. wheel hubs among the figure, 2. ears joint, 3. vertical shaft, 4. compound splicer, 5. blade joint, 6. blade, 7. overhanging section, 8. horizontal shaft hole, 9. horizontal axis, 10. vertical axis hole, 11. connecting grooves, 12. limited posts.
Embodiment
As Fig. 1, Fig. 2, shown in Figure 3, the compound hinged axial-flow blower of this blade and wheel hub, comprise wheel hub 1, blade 6 and the blade joint 5 that is connected with blade 6 connecting ends, mainly be to be provided with 4 the compound splicer 4 of zero moment of flexure at wheel hub 1, be provided with connecting groove 11 and mutually perpendicular vertical axis hole 10 and horizontal shaft hole 8 at each compound splicer 4, ears joint 2 on the wheel hub 1 is hinged by vertical shaft 3 with vertical axis hole 10, ears joint 2 is provided with the excessively limited post 12 of swing of limit blade about 6, blade joint 5 in the connecting groove 11 is hinged by horizontal axis 9 with horizontal shaft hole 8, and the hinged place is provided with overhanging section 7 that limit blade is excessively swung up and down.
As shown in Figure 4, blade 6 is to angle≤5 of lower swing °, and blade is angle≤3 ° of swing upwards, the angle that blade swings≤3 °.
Embodiment 1: the impeller shaft vertical ground, blade is air draft up or down.
Impeller diameter D=3m, hub diameter d=0.3m, power N=7.5kW, rotation speed n=260r/min, leaf quality M=8kg, number of blade Z=4, total head P=115Pa.
Calculate: angular velocity omega=n * π/30=27.2rad/s, the blade center of gravity radius R=(D+d)/and 4=0.825m, blade centroid position L1=0.675m, blade aerodynamic center position L2=1.01m.
Gravity W=mg=78.4N,
Aerodynamic force F2=(π * D
2* P/4)/Z=203N,
Centrifugal force F3=M * R * ω
2=4883N,
Resistance of air F4=9551N/ (n * L2 * Z)=68.2N
Upwards during air draft blade to angle [alpha]=arc tg (W+1.5F2)/F3=4.5 ° of lower swing, the angle beta that blade swings=arc tg (1.5F4/F3)=1.2 °.
Downward air exhaust blade angle [alpha]=2.6 ° of swing upwards, the angle beta that blade swings=1.2 °.
Embodiment 2: the impeller shaft vertical ground, blade is air draft up or down.
D＝9.2m，d＝1.5m，N＝200KW，n＝127r/min，M＝65kg，Z＝10，P＝175Pa
Calculate: ω=13.3rad/s, R=2.675m, L1=1.925, L2=2.888.
Calculated by example 1 formula: W=637N, F2=1163N, F3=30757N, F4=521N.
Upwards during air draft blade to angle [alpha]=4.4 of lower swing °, the angle beta that swings=1.5 °;
Blade angle [alpha]=2.1 ° of swing upwards during air draft downwards, the angle beta that swings=1.5 °.
During horizontal air draft, the α angle that swings up and down is less than air draft upwards and greater than downward air draft, thereby needn't calculate again, needs to calculate the β angle that swings and gets final product.And the diverse location of β angle when rotating 360 °, the β value is different, existing maximum value and the minimum value only calculated.
β＝arc?tg{9551N/[(n×L1×Z)±W]/F3}。
Impeller D=3m, β max=2.1 °, β min=0.28 °.
Impeller D=9.2m, β max=2.6 °, β min=0.26 °.
Claims (2)
1. a blade and the compound hinged axial-flow blower of wheel hub, comprise wheel hub (1), blade (6) and the blade joint (5) that is connected with blade (6) connecting end, it is characterized in that: be provided with quantity at wheel hub (1) and be at least two zero compound splicers of moment of flexure (4), be provided with connecting groove (11) and mutually perpendicular vertical axis hole (10) and horizontal shaft hole (8) at each compound splicer (4), ears joint (2) on the wheel hub (1) is hinged by vertical shaft (3) with vertical axis hole (10), ears joint (2) is provided with the limited post of excessively swinging about limit blade (6) (12), blade joint (5) in the connecting groove (11) is hinged by horizontal axis (9) with horizontal shaft hole (8), and the hinged place is provided with overhanging section (7) that limit blade is excessively swung up and down.
2. the compound hinged axial-flow blower of a kind of blade according to claim 1 and wheel hub is characterized in that: said blade (6) is to angle≤5 of lower swing °, angle≤3 of swing ° upwards, the angle that swings≤3 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110282216 CN102297159B (en) | 2011-09-16 | 2011-09-16 | Axial impeller with vanes and hubs in composite hinge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110282216 CN102297159B (en) | 2011-09-16 | 2011-09-16 | Axial impeller with vanes and hubs in composite hinge |
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| Publication Number | Publication Date |
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| CN102297159A CN102297159A (en) | 2011-12-28 |
| CN102297159B true CN102297159B (en) | 2013-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110282216 Active CN102297159B (en) | 2011-09-16 | 2011-09-16 | Axial impeller with vanes and hubs in composite hinge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3362689A1 (en) * | 2015-10-16 | 2018-08-22 | R.E.M. Holding S.r.l. | Connecting element for connecting a blade to the hub in an industrial axial fan, and blade system comprising said connecting element |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1195527A1 (en) * | 2000-10-05 | 2002-04-10 | Diandra S.A. | Axial fan |
| NL1022084C2 (en) * | 2002-12-05 | 2004-06-08 | Ventilatoren Sirocco Howden Bv | Rotor with flexible blades for e.g. fans, has blade stops formed by springs between hub and blades |
| CN101832285A (en) * | 2010-04-29 | 2010-09-15 | 上海尔华杰机电装备制造有限公司 | Fan impeller for cooling |
| CN202301175U (en) * | 2011-09-16 | 2012-07-04 | 威海克莱特菲尔风机股份有限公司 | Axial flow impeller formed by compositely hinging blade with wheel hub |
-
2011
- 2011-09-16 CN CN 201110282216 patent/CN102297159B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1195527A1 (en) * | 2000-10-05 | 2002-04-10 | Diandra S.A. | Axial fan |
| NL1022084C2 (en) * | 2002-12-05 | 2004-06-08 | Ventilatoren Sirocco Howden Bv | Rotor with flexible blades for e.g. fans, has blade stops formed by springs between hub and blades |
| CN101832285A (en) * | 2010-04-29 | 2010-09-15 | 上海尔华杰机电装备制造有限公司 | Fan impeller for cooling |
| CN202301175U (en) * | 2011-09-16 | 2012-07-04 | 威海克莱特菲尔风机股份有限公司 | Axial flow impeller formed by compositely hinging blade with wheel hub |
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| CN102297159A (en) | 2011-12-28 |
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| CB02 | Change of applicant information |
Address after: 264200 hi tech Industrial Development Zone, Weihai Village town of science and technology Applicant after: Weihai Credit Fan Ventilator Co., Ltd. Address before: 264210, Weihai, Shandong Province town of Weihai light Phil fan Co., Ltd. Applicant before: Weihai Credit Fair Fan Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: WEIHAI CREDIT FAIR FAN CO., LTD. TO: WEIHAI CREDIT FAN VENTILATOR CO., LTD. |
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Denomination of invention: An axial flow impeller with compound hinge of blade and hub Effective date of registration: 20210115 Granted publication date: 20130918 Pledgee: Bank of China Limited Weihai Branch Pledgor: WEIHAI CREDITFAN VENTILATOR Co.,Ltd. Registration number: Y2021980000417 |