CN102287401B - Arc plate blade with ladder-shaped variable thicknesses - Google Patents

Arc plate blade with ladder-shaped variable thicknesses Download PDF

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CN102287401B
CN102287401B CN 201110232162 CN201110232162A CN102287401B CN 102287401 B CN102287401 B CN 102287401B CN 201110232162 CN201110232162 CN 201110232162 CN 201110232162 A CN201110232162 A CN 201110232162A CN 102287401 B CN102287401 B CN 102287401B
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blade
arc plate
thickness
layer
root
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CN102287401A (en
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贺秋冬
肖淑芬
丁涛
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Hubei Engineering University
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XIAOGAN COLLEGE
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Abstract

The invention relates to an arc plate blade with ladder-shaped variable thicknesses. The arc plate blade comprises a basic layer and a thickening layer, wherein the thickening layer is formed on the basis of the basic layer with the same thickness, the thickness of the blade is thickened step by step from top to root, the thickness values appear as a ladder shape, and the arc plate blades are uniformly distributed on the hub of the fan impeller. In the invention, when the impeller is running, load-stress on a unit area cannot be continuously increased when load on each section of the blade from top to root is continuously increased, thus fractures caused by excessive stress on the root of the blade in the running of the impeller can be prevented. The arc plate blade provided by the invention can be applied to an axial-flow type ventilator, especially for the axial-flow type ventilator with a large-diameter high-speed impeller.

Description

The arc plate blade that the thickness stepped shaft changes
Affiliated technical field
The invention belongs to field of fluid machinery, relate to a kind of blade of propeller fan.
Background technique
Blower fan be will rotation mechanical energy convert gas pressure energy and kinetic energy to, and the general machinery equipment that gas is transferred out; Propeller fan converts the mechanical energy of rotation to gas pressure energy and kinetic energy, and with gas by fan shaft to introducing and machinery from axially transferring out.Impeller is the critical component of the realization mechanical energy conversion of blower fan, is comprised of blade and wheel hub.The blade profile of blade has wing blade and circular arc plate shape.
Known arc plate blade is uniform thickness, i.e. consistency of thickness on the arbitrary cross section of whole blade from the root to the top.When fan operation, blade High Rotation Speed, blade are subject to the effect of a plurality of power such as centrifugal force, aerodynamic force, gravity.Under the comprehensive function of these power, stressed continuing to increase on the leaf cross-section from the top to the root, because of vane thickness constant, cause on the unit area from the top to the root stressed-stress continues to increase, stress on the cross section of top is minimum as a result, more larger near its stress of root, the stress on the root cross section maximum (even the chord length of root increases to some extent than the larger cross-section area that makes in top, normally result is still so).Therefore, blade is easily at the root fracture, especially large at impeller diameter, when rotating speed is high easily at fracture of root.
The leaf destruction problem of this situation can not solve by the method that strengthens whole vane thickness, because behind the whole thickening vanes, and its mass penalty, the centrifugal force that plays a major role increases in proportion, and the stress on the cross section is almost constant as a result.Therefore, general by changing blade material (adopting the material that intensity is higher or density is less) or use wing blades instead and deal with problems, but this can increase product cost or increasing manufacture difficulty.
Summary of the invention
In order to overcome the deficiency of existing arc plate blade, the invention provides a kind of arc plate blade, this blade stress on each cross section from the top to the root does not continue to increase, and has avoided the stress from the top to the root progressively to strengthen, and the phenomenon from fracture of root when causing impeller operation occurs.
The present invention solves the technological scheme that its problem adopts: blade pass is crossed welding, riveted joint, the mode such as bonding is connected with wheel hub, blade profile is circular arc plate, but the thickness of blade changes from the top to the root stepped shaft, the thickness at top is little, the thickness of root is large, and its thickness is stepped increase with stressed increase.Because of on from the top to the root cross section in the stressed increase, the stepped increase of cross-section area, thereby the stress on each cross section is not continued to increase, and the existing arc plate blade of the stress ratio of root of blade significantly reduces, and reaches large, the purpose of fracture not when rotating speed is high of impeller diameter.
The invention has the beneficial effects as follows, the blade that has solved the circular arc plate blade profile is easy to from the problem of root fracture, can be under the prerequisite that does not improve Material Strength, the impeller large at impeller diameter, that rotating speed is high adopts arc plate blade, has that the cost of material is low, make easy characteristics.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a Rotor of Axial Flow Fan of making of existing arc plate blade.
Fig. 2 is first embodiment of arc plate blade that the thickness stepped shaft changes.
Fig. 3 is first embodiment's of arc plate blade of thickness stepped shaft variation partial enlarged drawing.
Fig. 4 is the 3rd embodiment of arc plate blade that the thickness stepped shaft changes.
Fig. 5 is the 3rd embodiment's of arc plate blade of thickness stepped shaft variation partial enlarged drawing.
Among the figure: 1. wheel hub, 2. blade, the 3. basic layer of blade, 4. the thickening vanes layer one, and 5. the thickening vanes layer two.
Embodiment
Embodiment 1, and the first situation that vane thickness of the present invention forms the secondary ladder is as follows: in Fig. 2, be welded with equally distributed blade (2) at wheel hub (1).Blade reaches the thickening vanes layer one (4) that is close together with it by the basic layer of blade (3) and forms, and the blade profile of two-layer blade is the uniform thickness circular arc plate.Thickening vanes layer one (4) is shorter than the basic layer of blade (3), is generally the 1/2-1/3 of the basic layer of blade (3).In Fig. 3, each layer root is positioned on the same hub diameter, arranged sequentially by from left to right of the basic layer of thickening vanes layer one (4), blade (3), be that the blade profile concave surface of thickening vanes layer one (4) and the blade profile convex surface of the basic layer of blade (3) are fitted, the basic layer of three limits of thickening vanes layer one (4) and blade (3) welding, another side and wheel hub (1) welding, the blade total thickness forms the secondary ladder.The thickness of each layer of blade should be identical or approaching, makes each other to fit tightly, and will control welding deformation in the welding procedure.The material of blade can be sheet metal, plastics or composite material, and the shape of blade is twisted, and the established angle of root of blade is greater than the established angle of vane tip.
Embodiment 2, and the second case of vane thickness formation secondary ladder of the present invention is as follows: thickening vanes layer one (4), the basic layer of blade (3) are by dextrosinistral arranged sequentially, and all the other are with embodiment 1.
Embodiment 3, and vane thickness of the present invention forms the first situation of three grades of ladders.In Fig. 4, Fig. 5, be welded with the basic layer of blade (3) and thickening vanes layer one (4), thickening vanes layer two (5) on the wheel hub (1), the blade profile of three layers of blade is the uniform thickness circular arc plate.Thickening vanes layer one (4) is shorter than the basic layer of blade (3), is generally the 1/2-2/3 of the basic layer of blade (3); Thickening vanes layer two (5) is shorter than thickening vanes layer one (4), is generally the 1/4-1/3 of the basic layer of blade (3).Among Fig. 5, each layer root is positioned on the same hub diameter, press is thickening vanes layer two (5) from left to right, the basic layer of blade (3), thickening vanes layer one (4) arranged sequentially, be that the blade profile convex surface of thickening vanes layer one (4) and the blade profile concave surface of the basic layer of blade (3) are fitted, the blade profile convex surface of the basic layer of the blade profile concave surface of thickening vanes layer two (5) and blade (3) is fitted, thickening vanes layer one (4), weld with the basic layer of blade (3) respectively on three limits of thickening vanes layer two (5), another side and wheel hub (1) welding.Whole blade total thickness after the welding forms three grades of ladders.The thickness of each layer of blade should be identical or approaching, and the curve form of contact should be consistent, makes each other to fit tightly, and will control welding deformation in the welding procedure.The material of blade can be sheet metal, plastics or composite material, and the shape of blade is twisted, and the established angle of root of blade is greater than the established angle of vane tip.
Embodiment 4, and vane thickness of the present invention forms the second case of three grades of ladders.By being the arranged sequentially of thickening vanes layer one (4), blade basic layer (3), thickening vanes layer two (5) from left to right, all the other are with embodiment 3.
Embodiment 5, and vane thickness of the present invention forms the third situation of three grades of ladders.By being the arranged sequentially of the basic layer of blade (3), thickening vanes layer one (4), thickening vanes layer two (5) from left to right, consult Fig. 5, all the other are with embodiment 3.
Embodiment 6, and vane thickness of the present invention forms the 4th kind of situation of three grades of ladders.By be the arranged sequentially of thickening vanes layer two (5), thickening vanes layer one (4), blade basic layer (3) from left to right, all the other are with embodiment 3.
By that analogy, vane thickness of the present invention can also form the ladder of level Four or more multistage number.

Claims (6)

1. the arc plate blade that changes of a thickness stepped shaft, it is uniformly distributed on the wheel hub of draught fan impeller, it is characterized in that: the thickness of blade changes from the top to the root stepped shaft, and the thickness at top is little, and the thickness of root is large.
2. the arc plate blade that changes of thickness stepped shaft according to claim 1, it is characterized in that: blade is comprised of with thickening layer basic layer, the root of each layer is positioned on the same hub diameter, overhead height is different, basic layer is the highest, thickening layer progressively increases from the top to the root with the thickness sum of basic layer, forms ladder.
3. the arc plate blade that changes of thickness stepped shaft according to claim 1 and 2, it is characterized in that: whole blade is processed by a whole block material.
4. the arc plate blade that changes of thickness stepped shaft according to claim 1 and 2, it is characterized in that: whole blade is welded by the polylith material.
5. the arc plate blade that changes of thickness stepped shaft according to claim 1 and 2, it is characterized in that: whole blade is formed by the riveted joint of polylith material.
6. the arc plate blade that changes of thickness stepped shaft according to claim 1 and 2, it is characterized in that: whole blade is formed by the polylith material adhesive.
CN 201110232162 2011-08-03 2011-08-03 Arc plate blade with ladder-shaped variable thicknesses Active CN102287401B (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106287959B (en) * 2016-08-17 2022-03-22 芜湖美智空调设备有限公司 Quiet leaf wind wheel, cabinet air conditioner and air conditioner
CN106678002B (en) * 2016-11-28 2023-10-20 哈尔滨工大金涛科技股份有限公司 Wind turbine blade and blade processing method
CN110118197A (en) * 2018-02-07 2019-08-13 广东美的制冷设备有限公司 Axial-flow windwheel and air conditioner
US10920607B2 (en) 2018-09-28 2021-02-16 General Electric Company Metallic compliant tip fan blade
US11286807B2 (en) 2018-09-28 2022-03-29 General Electric Company Metallic compliant tip fan blade
CN111274655A (en) * 2020-01-18 2020-06-12 江苏大学 Optimization design method for arc plate blade of frost prevention machine
CN111720348B (en) * 2020-06-18 2021-06-29 八环科技集团股份有限公司 Special turbine fan for breathing machine and impeller machining process

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2144724Y (en) * 1992-11-25 1993-10-27 廖忠义 Multistage ladder type blade structure for ceiling fan
CN2767723Y (en) * 2005-01-14 2006-03-29 威海克莱特菲尔风机有限公司 Axial flow fan having hyperboloidal sweepforward blade with knifes on surface
CN1804407A (en) * 2002-06-25 2006-07-19 台达电子工业股份有限公司 Heat radiation fan

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002075159A1 (en) * 2001-03-15 2002-09-26 Arçelik A.S. Axial fan

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2144724Y (en) * 1992-11-25 1993-10-27 廖忠义 Multistage ladder type blade structure for ceiling fan
CN1804407A (en) * 2002-06-25 2006-07-19 台达电子工业股份有限公司 Heat radiation fan
CN2767723Y (en) * 2005-01-14 2006-03-29 威海克莱特菲尔风机有限公司 Axial flow fan having hyperboloidal sweepforward blade with knifes on surface

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Address after: No. 272, Jiaotong Avenue, Xiaonan District, Xiaogan City, Hubei Province, 432000

Patentee after: HUBEI ENGINEERING University

Address before: 432000 No. 272, Jiaotong West Road, Xiaogan City, Hubei Province

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