CN101092964A - Axial flow cooling blower fan - Google Patents

Axial flow cooling blower fan Download PDF

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Publication number
CN101092964A
CN101092964A CN 200710119141 CN200710119141A CN101092964A CN 101092964 A CN101092964 A CN 101092964A CN 200710119141 CN200710119141 CN 200710119141 CN 200710119141 A CN200710119141 A CN 200710119141A CN 101092964 A CN101092964 A CN 101092964A
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blade
guide vane
assembly
airfoil
air
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CN100497950C (en
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刘沛清
赵万里
屈秋林
乔万鑫
段会申
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Beihang University
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Beihang University
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Abstract

本发明公开了一种具有大直径8～10m、低压头70～130Pa、高风量440～550m3/s的轴流式冷却风机，由电机、风圈、导流片组件和桨叶组件组成，导流片组件的外圆环与风圈的一端连接，桨叶组件装配在风圈内，电机的输出轴穿过导流片组件的内圆环与桨叶组件的轮殻连接。本发明采用自由涡流叶栅理论，桨叶翼型采用低雷诺数、高升力翼型，并采用提高桨叶扭转角β以及增加桨尖弦长等措施制造出新型风机结构，同时在风机的出口安装导流片，用于回收风机出口的旋转动能，增加了风机的静压升，使空冷凝汽器出口的风速提高，强化了对空冷凝汽器的对流换热能力，从而提高了空冷凝汽器的散热效果。

Figure 200710119141

The invention discloses an axial flow cooling fan with a large diameter of 8-10m, a low-pressure head of 70-130Pa, and a high air volume of 440-550m3 /s, which is composed of a motor, an air ring, a deflector assembly and a paddle assembly. The outer ring of the deflector assembly is connected to one end of the wind ring, the blade assembly is assembled in the wind ring, and the output shaft of the motor passes through the inner ring of the deflector assembly and is connected to the wheel housing of the blade assembly. The invention adopts the free vortex cascade theory, the airfoil of the blade adopts low Reynolds number and high lift airfoil, and adopts measures such as increasing the torsion angle β of the blade and increasing the chord length of the blade tip to manufacture a new fan structure. Install deflectors to recover the rotational kinetic energy of the fan outlet, increase the static pressure rise of the fan, increase the wind speed at the outlet of the air-cooled condenser, and strengthen the convective heat transfer capacity of the air-cooled condenser, thereby improving the air-cooled condenser. The heat dissipation effect of the vaporizer.

Figure 200710119141

Description

Axial flow cooling blower fan
Technical field
The present invention relates to a kind of axial flow cooling blower fan, this cooling blower has major diameter 8～10m, low-head 70～130Pa, high air quantity 440～550m 3/ s.
Background technique
Because the important function that the forced-convection heat transfer of large axial flow fan in the direct air cooling system of thermal power plant has, so the quality of fan performance is directly determining the important symbol of the height of air cooling condenser radiating effect.Because air cooling condenser needs big air quantity in the heat radiation process, but pressure head is little, so the blower fan of air cooling system often adopts low-head, big air quantity, low noise axial fan.Yet in the season of sweltering heat in summer; ambient temperature is very high; particularly natural wind blew side from the boiler room; when under air cooling tower, forming hot refluence; the air quantity that existing blower fan blasts can not satisfy the heat radiation requirement of the air cooling condenser under the actual high temperature condition, has a strong impact on the radiating effect of air cooling condenser, even causes the shutdown of system; bring very big influence for the safety in production and the operation of power plant, caused enormous economic loss.
Summary of the invention
The purpose of this invention is to provide a kind of have major diameter 8～10m, low-head 70～130Pa, high air quantity 440～550m 3The axial flow cooling blower fan of/s, the blade of this cooling blower adopt free vortex flow Theories of Cascades, aerofoil profile to adopt low reynolds number Re, high-lift aerofoil profile C L, thereby its structure optimization is obtained preferable blade profile, realized the increase of blower fan rate of discharge; Simultaneously in order to improve the flow field structure in blower fan outlet port, and then the radiating effect of raising air cooling condenser, guide plate is installed in outlet at blower fan, be used to reclaim the rotation function of blower fan outlet, increased the static pressure liter of blower fan, the wind speed of air cooling condenser outlet is improved, thereby strengthened convection heat exchange ability air cooling condenser.
The present invention is a kind of have major diameter 8～10m, low-head 70～130Pa, high air quantity 440～550m 3The axial flow cooling blower fan of/s, form by motor, solar or lunar halo, guide plate assembly and paddle components, the outer toroid of guide plate assembly is connected with the smooth section of solar or lunar halo, and paddle components is assemblied in the solar or lunar halo, and the interior annulus that the output shaft of motor passes the guide plate assembly is connected with the wheel hub of paddle components.
The lift coefficient of the blade aerofoil profile in the paddle components of the present invention C l = L 1 2 ρ V ∞ 2 b , The resistance coefficient of blade aerofoil profile C d = D 1 2 ρ V ∞ 2 b .
The advantage of axial flow cooling blower fan of the present invention is: low reynolds number Re=1.5 * 10 of (1) blade aerofoil profile 6～3.9 * 10 6, high-lift aerofoil profile C L=0.479+0.0895 α, the resistance coefficient C of blade aerofoil profile d=0.0286-0.0039 α+0.0009 α 2(2) after the employing high-lift aerofoil profile, the wind flow of blower fan outlet obviously increases, and helps improving the radiating effect of air cooling condenser; (3) blade in the paddle components adopts independent design, regulates established angle when helping installing between each blade and is consistent; (4) blade aerofoil profile configuration adopts Fluent software to carry out the optimal design of two-dimensional gas dynamic response, improved the flow field structure of blower fan outlet, reclaim the rotation function of blower fan outlet, help improving the flow velocity of air cooling condenser outlet, strengthen the convection heat exchange ability of cool air and air cooling condenser, thereby improved the radiating effect of air cooling condenser.
Description of drawings
Fig. 1 is the external structure of axial flow cooling blower fan of the present invention.
Figure 1B is the external structure at another visual angle of axial flow cooling blower fan of the present invention.
Fig. 1 C is the front view of axial flow cooling blower fan of the present invention.
Fig. 1 D is the plan view of axial flow cooling blower fan of the present invention.
Fig. 2 is the external structure of guide plate assembly of the present invention.
Fig. 2 A is the front view of A guide plate.
Fig. 3 is the external structure of paddle components of the present invention.
Fig. 3 A is the blade external structure.
Fig. 3 B is the lateral plan of blade.
Fig. 3 C is the incoming flow angle of attack, lift coefficient and the resistance coefficient coordinate graph of a relation of blade aerofoil profile.
Among the figure: 1. guide plate assembly 101.A guide plate 102.B guide plate 103.C guide plate
104.D guide plate 105.E guide plate 106.F guide plate 107.G guide plate 108.H guide plate
109.I annulus in guide plate 110. outer toroid 111.
2. paddle components 201.A blade 202.B blade 203.C blade 204.D blade
205.E blade 206.F blade 207.G blade 208.H blade 209. wheel hubs
221. top airfoil 222. upper-end surfaces 223. attachment posts, 224. front-end faces, 225. lower aerofoils
226. blade-span axis 227. blade tips
3. solar or lunar halo 301. extending sections 302. smooth section
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is a kind of have major diameter 8～10m, low-head 70～130Pa, high air quantity 440～550m 3The axial flow cooling blower fan of/s, form (shown in Fig. 1, Figure 1A, Figure 1B) by motor (not shown), solar or lunar halo 3, guide plate assembly 1 and paddle components 2, the outer toroid 110 of guide plate assembly 1 is connected with the smooth section 302 of solar or lunar halo 3, paddle components 2 is assemblied in the solar or lunar halo 3, and the interior annulus 111 that the output shaft of motor passes guide plate assembly 1 is connected with the wheel hub 209 of paddle components 2.(shown in Fig. 1 C) solar or lunar halo 3 profiles are provided with smooth section 302, extending section 301 from top to bottom, and the expansion ratio  of extending section 301 ends is 3～10 degree.In the present invention, when motor driving paddle components 2 is rotated along clockwise direction, the cool air of air cooling condenser below is upwards taken out, when motor driving paddle components 2 when counterclockwise direction is rotated, the hot air of air cooling condenser top is inhaled downwards, thereby made air cooling condenser have preferable radiating effect.The output power of motor is 120～160KW.
Referring to shown in Figure 2, between interior annulus 111 and outer toroid 110, be connected with A guide plate 101, B guide plate 102, C guide plate 103, D guide plate 104, E guide plate 105, F guide plate 106, G guide plate 107, H guide plate 108, I guide plate 109 in turn.In the present invention, nine flow deflector structures are identical, are wide circular arc aerofoil profile, aerofoil profile chord length b sBe 500mm, aerofoil profile width b wBe 2.5～5mm (shown in Fig. 2 A).
In the present invention, evenly be provided with on the cylindrical of wheel hub 209 a plurality of domes hole (dome hole length 10～50mm), symmetry has A through hole, B through hole (being used for pin passes) on the dome hole; The front-end face of each blade is provided with attachment post, and symmetry has C through hole, D through hole (being used for pin passes) on the attachment post; In when assembling, attachment post is installed in the dome hole, and after passing A through hole, C through hole, D through hole, B through hole with pin both is fixed, thereby realizes the flexible assembly of wheel hub 209 and eight blades.Referring to shown in Figure 3, on the cylindrical of wheel hub 209 by attachment post being installed in the dome hole and being equipped with A blade 201, B blade 202, C blade 203, D blade 204, E blade 205, F blade 206, G blade 207, H blade 208 in turn.In the present invention, A blade 201, B blade 202, C blade 203, D blade 204, E blade 205, F blade 206, G blade 207, H blade 208 structures are identical, and the established angle γ between two blades is 15～30 degree.In order to describe the concrete structure of blade of the present invention in detail, shown in Fig. 3 A, Fig. 3 B, front-end face 224 central positions of A blade 201 are provided with attachment post 223, and the end symmetry of attachment post 223 has C through hole, D through hole (not shown), the length 10～50mm of attachment post 223.The blade torsional angle β of top airfoil 225 is 10～15 degree.
Shown in Fig. 3 C, adopted large-scale general fluid mechanics software for calculation Fluent to carry out the computational analysis of two-dimensional gas dynamic response for the optimization of blade aerofoil profile, in system of coordinates XOY, X-axis is represented aerofoil profile string of a musical instrument direction, Y-axis is represented and the blade-span axis parallel direction, incoming flow angle of attack α=-6～+ 16 degree are the angle that comes between flow path direction and the X-axis (aerofoil profile string of a musical instrument direction), to be positive incoming flow angle of attack α (being negative incoming flow angle of attack α clockwise) counterclockwise.The lift of aerofoil profile with come flow path direction vertical, the resistance of aerofoil profile is parallel with flow path direction, and the lift coefficient C of aerofoil profile is then arranged lWith resistance coefficient C dFor:
C l = L 1 2 ρ V ∞ 2 b , In the formula, L represents the lift of blade aerofoil profile, and ρ represents the density of air, V ∞The expression speed of incoming flow, b represents the chord length of blade aerofoil profile, unit: mm.
C d = D 1 2 ρ V ∞ 2 b , In the formula, D represents the resistance of blade aerofoil profile, and ρ represents the density of air, V ∞Expression air speed of incoming flow, b represents the chord length of blade aerofoil profile, unit: mm.
Has the lift coefficient C of aerofoil profile lWith resistance coefficient C dIn the relation, design one have eight blades, nine guide plates, when the motor output power is 132KW, blade chord length 3705mm, blade torsional angle β be that 14.7 °, blade tip chord length 1562mm, front-end face chord length b are that 1910.35mm and established angle γ are 28.5 °, and low reynolds number Re=1.79 * 10 of blade aerofoil profile are then arranged 6, high-lift aerofoil profile C L=0.479+0.0895 α, the resistance coefficient C of blade aerofoil profile d=0.0286-0.0039 α+0.0009 α 2
By blade aerofoil profile configuration is optimized design, and adopt the blade computational analysis of low reynolds number, high-lift aerofoil profile to compare, increase established angle γ, the increase blade torsional angle β (shown in Fig. 3 B) between two blades and increase blade tip 227 chord lengths, can improve the static pressure of blower fan, increase the flow of blower fan outlet.Practice shows, during the broiling summer, when ambient temperature is higher than 30 ℃, adopts the blower fan of high-lift aerofoil profile can increase the blower fan rate of discharge, improves the air cooling condenser radiating effect, makes the air cooling system safe production in summer.
In the present invention, guide plate assembly 1 is set, under blower fan rated speed 67.6rpm condition, the fluid structure in blower fan outlet port is obviously improved in the upper end of paddle components 2.The rotational speed in blower fan outlet port reduces greatly simultaneously, the flow of blower fan, stagnation pressure, dynamic pressure all reduce, static pressure and air horsepower increase, caused the air velocity of air cooling condenser outlet to increase thus, strengthen the convection heat exchange ability of air and air cooling condenser, improved the radiating effect of air cooling condenser.
The axial flow cooling blower fan of the present invention's design has following technical requirement:
(1) under the rated speed of paddle components 2,, can make maximum 10% air quantity or the pressure increment of increasing of blower fan by changing blade installation angle β (pitch);
(2) blower fan is an axial flow, and in order to control the noise of blower fan, the tip speed of blower fan blade must not surpass 60m/s;
(3) minimum area of rotary fans should be not less than 40% of air cooling condenser outlet wind-exposuring area.Blower fan is not more than 45 ° to the diffusion angle of air cooling condenser outlet;
(4) the radial spacing 9～19mm between the inwall of the blade tip of blade and solar or lunar halo;
(5) blade adopts independent design, is installed on the wheel hub by attachment post, and blade has interchangeability;
(6) the blower fan total acoustic power level noise of the present invention's design is no more than 110dB.
Axial flow cooling blower fan of the present invention goes for the thermal power plant direct air cooling system and other are large diameter, the design of the axial flow cooling blower of low-head, high air quantity.

Claims (5)

1、一种轴流式冷却风机，其特征在于：由电机、风圈(3)、导流片组件(1)和桨叶组件(2)组成，导流片组件(1)的外圆环(110)与风圈(3)的平滑段(302)连接，桨叶组件(2)装配在风圈(3)内，电机的输出轴穿过导流片组件(1)的内圆环(111)与桨叶组件(2)的轮毂(209)连接；1. An axial flow cooling fan, characterized in that: it consists of a motor, an air ring (3), a deflector assembly (1) and a paddle assembly (2), and the outer ring of the deflector assembly (1) (110) is connected with the smooth section (302) of the wind circle (3), the paddle assembly (2) is assembled in the wind circle (3), and the output shaft of the motor passes through the inner ring ( 111) being connected with the hub (209) of the paddle assembly (2); 所述导流片组件(1)的内圆环(111)与外圆环(110)之间顺次连接有A导流片(101)、B导流片(102)、C导流片(103)、D导流片(104)、E导流片(105)、F导流片(106)、G导流片(107)、H导流片(108)、I导流片(109)；A导流片(101)、B导流片(102)、C导流片(103)、D导流片(104)、E导流片(105)、F导流片(106)、G导流片(107)、H导流片(108)和I导流片(109)结构相同，且为等宽圆弧翼型，翼型弦长bs为500mm，翼型宽度bw为2.5～5mm；A guide vane (101), B guide vane (102), C guide vane ( 103), D guide vane (104), E guide vane (105), F guide vane (106), G guide vane (107), H guide vane (108), I guide vane (109) ; A guide vane (101), B guide vane (102), C guide vane (103), D guide vane (104), E guide vane (105), F guide vane (106), G The deflector (107), the H deflector (108) and the I deflector (109) have the same structure, and are equal-width arc airfoils, the airfoil chord length b s is 500 mm, and the airfoil width b w is 2.5 ~5mm; 所述桨叶组件(2)的轮毂(209)的外圆上均匀设有多个凸圆孔，每个桨叶的前端面上设有连接柱；轮毂(209)的外圆上通过连接柱安装在凸圆孔内，且顺次装配有A桨叶(201)、B桨叶(202)、C桨叶(203)、D桨叶(204)、E桨叶(205)、F桨叶(206)、G桨叶(207)、H桨叶(208)；A桨叶(201)、B桨叶(202)、C桨叶(203)、D桨叶(204)、E桨叶(205)、F桨叶(206)、G桨叶(207)和H桨叶(208)结构相同，且两个桨叶之间的安装角γ为15～30度；The outer circle of the wheel hub (209) of the blade assembly (2) is evenly provided with a plurality of convex holes, and the front end of each blade is provided with a connecting column; the outer circle of the wheel hub (209) passes through the connecting column. Installed in the convex hole, and equipped with A paddle (201), B paddle (202), C paddle (203), D paddle (204), E paddle (205), F paddle (206), G blade (207), H blade (208); A blade (201), B blade (202), C blade (203), D blade (204), E blade ( 205), F blade (206), G blade (207) and H blade (208) have the same structure, and the installation angle γ between the two blades is 15-30 degrees; 所述风圈(3)从上至下设有平滑段(302)、扩张段(301)，扩张段(301)端部的扩张度为3～10度。The air ring (3) is provided with a smooth section (302) and an expansion section (301) from top to bottom, and the expansion degree  at the end of the expansion section (301) is 3-10 degrees. 2、根据权利要求1所述的轴流式冷却风机，其特征在于：桨叶组件(2)上的桨叶翼型的升力系数 C l = L 1 2 ρ V ∞ 2 b , 式中，L表示桨叶翼型的升力，ρ表示空气的密度，V∞表示来流速度，b表示桨叶翼型的弦长，单位：mm；桨叶组件(2)上的桨叶翼型的阻力系数 C d = D 1 2 ρ V ∞ 2 b , 式中，D表示桨叶翼型的阻力，ρ表示空气的密度，V∞表示空气来流速度，b表示桨叶翼型的弦长，单位：mm。2. The axial flow cooling fan according to claim 1, characterized in that: the lift coefficient of the blade airfoil on the blade assembly (2) C l = L 1 2 ρ V ∞ 2 b , In the formula, L represents the lift force of the blade airfoil, ρ represents the density of the air, V ∞ represents the incoming flow velocity, and b represents the chord length of the blade airfoil, unit: mm; the blade wing on the blade assembly (2) type drag coefficient C d = D. 1 2 ρ V ∞ 2 b , In the formula, D represents the resistance of the blade airfoil, ρ represents the density of the air, V ∞ represents the incoming air velocity, and b represents the chord length of the blade airfoil, unit: mm. 3、根据权利要求1所述的轴流式冷却风机，其特征在于：桨叶组件(2)上的桨叶的上翼面的扭角β为10～15度。3. The axial flow cooling fan according to claim 1, characterized in that: the twist angle β of the upper airfoil of the blade on the blade assembly (2) is 10-15 degrees. 4、根据权利要求1所述的轴流式冷却风机，其特征在于：桨叶组件(2)上的桨叶翼型的来流迎角α为-6～+16度。4. The axial flow cooling fan according to claim 1, characterized in that: the angle of attack α of the blade airfoil on the blade assembly (2) is -6 to +16 degrees. 5、根据权利要求1所述的轴流式冷却风机，其特征在于：桨叶组件(2)上的桨叶翼型的低雷诺数Re为1.5×106～3.9×106，高升力翼型CL为0.479+0.0895α，桨叶翼型的阻力系数Cd为0.0286-0.0039α+0.0009α2，α表示来流迎角的角度。5. The axial-flow cooling fan according to claim 1, characterized in that: the low Reynolds number Re of the blade airfoil on the blade assembly (2) is 1.5×10 6 to 3.9×10 6 , and the high-lift wing The type C L is 0.479+0.0895α, the drag coefficient C d of the blade airfoil is 0.0286-0.0039α+0.0009α 2 , and α represents the angle of attack of incoming flow.
CNB2007101191415A 2007-07-17 2007-07-17 Axial flow cooling blower fan Expired - Fee Related CN100497950C (en)

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CN104069759A (en) * 2014-07-07 2014-10-01 刘海 Air mixed type high-energy-saving material mixer provided with HZJH paddles
CN104454639A (en) * 2014-11-28 2015-03-25 南阳防爆集团股份有限公司 Novel generator rotor axial fan
CN105065302A (en) * 2015-08-06 2015-11-18 浙江上风高科专风实业有限公司 Efficient sweepforward-type subway tunnel axial flow fan
CN105358839A (en) * 2013-07-02 2016-02-24 株式会社Ihi Stator vane structure and turbofan jet engine using same
CN107084154A (en) * 2017-06-19 2017-08-22 苏州前川机电有限公司 Axial flow blower carbon fiber impeller
CN113294357A (en) * 2020-03-29 2021-08-24 苏州市臻湖流体技术有限公司 Intelligent movement high compression pump

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105358839A (en) * 2013-07-02 2016-02-24 株式会社Ihi Stator vane structure and turbofan jet engine using same
CN104069759A (en) * 2014-07-07 2014-10-01 刘海 Air mixed type high-energy-saving material mixer provided with HZJH paddles
CN104454639A (en) * 2014-11-28 2015-03-25 南阳防爆集团股份有限公司 Novel generator rotor axial fan
CN105065302A (en) * 2015-08-06 2015-11-18 浙江上风高科专风实业有限公司 Efficient sweepforward-type subway tunnel axial flow fan
CN105065302B (en) * 2015-08-06 2018-01-16 浙江上风高科专风实业有限公司 A kind of efficiently sweepforward type subway tunnel axial flow blower
CN107084154A (en) * 2017-06-19 2017-08-22 苏州前川机电有限公司 Axial flow blower carbon fiber impeller
CN113294357A (en) * 2020-03-29 2021-08-24 苏州市臻湖流体技术有限公司 Intelligent movement high compression pump

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