CN205639002U - It makes an uproar to fall subtracts turboshaft stream fan - Google Patents

It makes an uproar to fall subtracts turboshaft stream fan Download PDF

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Publication number
CN205639002U
CN205639002U CN201620357017.7U CN201620357017U CN205639002U CN 205639002 U CN205639002 U CN 205639002U CN 201620357017 U CN201620357017 U CN 201620357017U CN 205639002 U CN205639002 U CN 205639002U
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China
Prior art keywords
blade
fan
noise
impeller
beta
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Expired - Fee Related
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CN201620357017.7U
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Chinese (zh)
Inventor
王天垚
窦华书
徐金秋
陈小平
魏义坤
杨徽
陈兴
李昆航
迟劭卿
姜陈锋
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Zhejiang Sci Tech University ZSTU
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Zhejiang Sci Tech University ZSTU
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Abstract

The utility model discloses an it makes an uproar to fall subtracts turboshaft stream fan, including driving motor, impeller, dryer and support, it has the blade to distribute on the impeller, and the blade is pressed the following formula at ascending distribution angle alpha of impeller week and is confirmed: alpha = beta + 5.66sin beta, wherein beta is supposing the distribution angle when the blade equidistance distributes, the blade be close to wheel hub in trailing edge department and locate each with the dryer and beaten a plurality of hole. The utility model discloses design in this three angle of fan efficiency, fan noise and product life, the beneficial effect after improving has: (1 )Improve axial fan's efficiency, (2 )Reduce fan operation's noise, (3 )Improve fan internal flow's mobile situation, the life of fan vibration, extension fan is reduced in production (4) of reducing the swirl.

Description

A kind of noise reduction subtracts whirlpool axial flow blower
Technical field
This utility model belongs to field of ventilation equipment, relates to axial flow blower, is specifically related to a kind of noise reduction and subtracts whirlpool axial flow blower.
Background technology
Ventilation blower is application surface a kind of universal machine widely, directs wind and chemical-process to mine ventilation, boiler greatly, little invariably uses ventilation blower to industrial furnace air blast and air-conditioning, constructure ventilation etc..Well-designed manufacture and the ventilation blower of reasonable employment, to energy-conservation significant with minimizing sound pollution.
Low pressure axial-flow fan is as ventilation, HVAC, cooling, air-conditioning and industrial equipment and the major impetus of household electrical appliance such as transports, so being used widely.The Aerodynamic Characteristics of axial flow blower is that total head is low, air quantity is big, impeller adiabatic efficiency is low, generally low by about 10% than centrifugal impeller, and reason is to have gap between its blade and pipeline, there is Secondary Flow on leaf top, blade root is connected with wheel hub, separates stream the most serious, has substantial amounts of whirlpool near blade root and leaf top, even reflux, cause the biggest flow losses.
In propeller fan, air-flow is extremely complex through the pressure loss of blade, and the pressure loss along blade height is unevenly distributed.At blade mean radius, the pressure loss is smaller, and the pressure loss is concentrated mainly in region the narrowest in blade wake;At the leaf road mid portion near blade mean radius, the pressure loss is smaller, and ratio is more uniform;But near wheel hub and casing, the region of the pressure loss expands, and the numerical value of the pressure loss also increased.
That is owing to flowing through Ye Daoshi when air-flow, there is relative motion, then had active force between them, and the pressure of forward face is greater than the pressure of blade convex surface between air-flow and blade.Therefore, between two adjacent blades, there is transverse-pressure gradient from the concave surface of a blade to the convex surface of another blade, this transverse-pressure gradient increases along with the increase of lift coefficient.On the other hand, air-flow through leaf grating, then creates centrifugal force with curvilinear motion form, and the direction of this centrifugal force is the concave surface that the convex surface from a blade is directed towards blade.At the mid portion along blade height, the transverse-pressure gradient between adjacent blades is balanced with the centrifugal force of air-flow, so air-flow will not produce the flowing of horizontal direction.But it is the most different at root of blade and top situation.Such as, the stream pressure in root of blade, hub surface boundary-layer and the stream pressure outside boundary-layer are identical, and the air velocity inside boundary-layer is along with reducing to the close of hub surface, and trend towards zero.Thus inside boundary-layer, there is transverse-pressure gradient, but but there is no the centrifugal force of (or seldom having) air-flow, then the transverse gradients pressure of boundary-layer can not be balanced, gas in boundary-layer there will be the horizontal mobility that the concave surface from a blade flows to the convex surface of adjacent blades, the pressure in boundary-layer near forward face decreases, and near the convex surface of adjacent blades, pressure but increased, then define whirlpool.These whirlpools are taken away by primary air, and after blade tail end, these whirlpools are gradually converted into heat energy loss and fall, and this are lost in root of blade and top has.
The noise source of blower fan mainly includes aerodynamic noise and mechanical noise.Aerodynamic noise is that gas flowing is neutralized the interaction generations such as fan blade, air channel and commutator, including impact noise, rotational noise and eddy current crack etc..Mechanical noise is the friction between the moving component of blower fan, shock and vibration generation.The method reducing at present fan noise is divided into active noise reduction and two aspects of passive noise reduction, and active noise reduction is to manage to make blower fan send the least noise, and passive noise reduction is that the noise managing to make blower fan send is tried one's best few outwardly environmental dissemination.Passive noise-reduction method quarantine measures to be increased, and fan energy consumption increase.Active denoising method is by improving the methods such as blower fan structure, impeller shape, leaf morphology, blade and duct materials, reduces the noise that blower fan produces.The method actively reducing fan noise mainly has: takes bionic, non-smooth form at runner and blade surface, improves the methods such as blade material, improvement blade surface curve, improvement air channel structure.Wherein arranging the method for bionic, non-smooth form simply in the edge of blade or surface increase Non-smooth surface form at blade surface, it is not necessary to extra auxiliary device and external energy, do not increase extra cost, noise reduction is preferable.
Wood wool cement board started extensively to apply in Europe in the forties, had the most become the construction material being of wide application in the world.Its practicality is wide, excellent performance, has corrosion resistant, ant heat-resisting, resistance to erosion, the easily multiple advantage such as processing and cement, Calx, good, the environmental protection of Gypsum Fibrosum conformability.Now, the national special manufacturing company having defined this type of sheet material many such as Holland, Finland, Germany, Austria, Russia, and professional equipment manufacturing firm.Why wood wool cement board is favored by society, it is because it and there is preferable physical and mechanical property and excellent building function, belong to environment-friendly building materials, by cement as cross-linking agent, wood wool, as fibre reinforced materials, adds the sheet material that portions additive is suppressed, is mainly processed with Portland cement gluing by wood flour in small, broken bits, color deashing, two-sided flat smooth.It is a kind of porous sound absorption organic plant fiber, has good sound absorbing capabilities.
Summary of the invention
The purpose of this utility model is, the problem such as loss serious big for existing noise of axial flow fan, it is provided that the noise reduction of a kind of non-equidistance perforated vanes subtracts whirlpool axial flow blower.
The technical solution of the utility model is such that a kind of noise reduction and subtracts whirlpool axial flow blower, including driving motor, impeller, air duct and support, blade is distributed on impeller, it is characterized in that: blade distribution angle α in impeller circumference determines as the following formula: α=β+5.66sin β, wherein β is to assume distribution angle when blade is equally spaced.
As further technical scheme, described blade is respectively equipped with several holes at trailing edge at wheel hub and air duct.
The beneficial effects of the utility model:
This utility model mainly designs in fan efficiency, fan noise and product these three in service life angle, and specific design is: make motor be connected with air duct V-type support;Use non-equidistance Leaf positional distribution;Use the airfoil fan of trailing edge perforate;In the middle of blade, wheel hub increases strip baffle plate;One layer of wood wool cement board of air duct outer wrap.Wood wool cement board started extensively to apply in Europe in the forties, had the most become the construction material being of wide application in the world.Its practicality is wide, excellent performance, has corrosion resistant, ant heat-resisting, resistance to erosion, the easily multiple advantage such as processing and cement, Calx, good, the environmental protection of Gypsum Fibrosum conformability.It is a kind of porous sound absorption organic plant fiber, has good sound absorbing capabilities.
Beneficial effect after improvement has: (1) improves the efficiency of axial flow blower;(2) noise of fan operation is reduced;(3) improving the flow condition in blower interior flow field, the generation (4) reducing whirlpool reduces fan vibration, extends the service life of blower fan.
Accompanying drawing explanation
Fig. 1 is lateral general view of the present utility model.
Fig. 2 is the front view of Fig. 1.
Fig. 3 is the rearview of Fig. 1.
Fig. 4 is blade actual and distribution angle comparison figure of hypothesis on impeller.
In figure: 1, air duct, 2, drive motor, 3, V-type support, 4, airfoil fan, 5, strip baffle plate, 6, wheel hub, 7, wood wool cement board.
Detailed description of the invention
The utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1,2 and 3, the noise reduction of a kind of non-equidistance perforated vanes subtracts whirlpool axial flow blower, including air duct 1, drives motor 2, bracing frame, airfoil fan 4, strip baffle plate 5, wheel hub 6 and wood wool cement board 7;Bracing frame can use truss or V-type support 3, and the present embodiment uses V-type support 3;Three V-type supports 3 are uniformly distributed along the circumference, and the two-arm of each V-type support 3 is all welded with air duct 1;Three V-type timbering materials are wood wool cement board, for the efficient sound-absorbing material of one;Motor 2 is driven all to be connected by screw bolt and nut with three V-type supports 3.As it is shown on figure 3, one of them V-type support 3 is positioned at driving motor 2 bottommost, so it is beneficial to drive motor 2 reduce vibrations when working and increase working life.Impeller blade uses non-equidistance distribution;The trailing edge of impeller airfoil fan has 4 holes near wheel hub and air duct position, and bore dia and height ratio of blading value are 0.1;In the middle of blower fan two blade, hub positions has a strip baffle plate, and length is consistent with aerofoil profile chord length at blade root.One layer of wood wool cement board of air duct outer wrap, it is possible to effectively absorb fan noise.
The noise source of blower fan mainly includes aerodynamic noise and mechanical noise.Aerodynamic noise is that gas flowing is neutralized the interaction generations such as fan blade, air channel and commutator, including impact noise, rotational noise and eddy current crack etc..In the single-stage axial blower fan not having commutator and centrifugal fan, use unequal blade pitgh, the noise peak of blower fan fundamental frequency can be reduced.The blade of unequal spacing has modulating action to blower fan by frequency and harmonic wave thereof, i.e. for any one harmonic wave, has significant peak value unlike equidistant blade blower fan.Under taking into account acoustic efficiency and fan efficiency situation, in the case of finding that the number of blade is 8, Leaf positional distribution is calculated by formula α=β+5.66sin β.The position that when wherein β is equidistant, blade center of gravity should be installed, the position that when α is unequal-interval, blade center of gravity should be installed, the most as shown in Figure 4.Distribution angle β takes 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, 315 ° and 360 ° respectively, therefore distribution angle α is taken as 49.00 °, 95.66 °, 139.00 °, 180 °, 221.00 °, 264.34 °, 311.00 ° and 360 ° respectively, actual effect is as shown in Figure 2.It being carried out numerical simulation and test finds that its noise is substantially reduced, and blast and flow slightly increased, after illustrating to improve, model does not produces harmful effect to aerodynamic performance.
In order to reduce the eddy current crack of blower fan, it is also possible to the method using fan blade perforation.There is eddy current segregation phenomenon at the trailing edge of blade, use blade method for punching that fraction can be made to flow to blade low pressure surface from blade high-pressure side, blade burble point can be promoted to move below flowing, its mechanism is equal to boundary-layer blowing effect.Which decreasing the Disengagement zone at blade exit interface, Disengagement zone strength of vortex and size to reduce, noise reduces the most therewith.Because the air-flow of the mid portion of blade height can't produce horizontal mobility, so making a call to four holes this model airfoil fan is only the most each at wheel hub and air duct at trailing edge.For meeting blade strength problem, the diameter D in hole and leaf height H ratio are taken as 0.1, at end of blade, the circular hole distance of center circle isolated edge near blade edge is 2D length, and the circular hole center of circle at blade root is 3D with the radial distance of wheel hub, and between two circular holes, the distance in the center of circle is all 3D length.
Stream pressure in root of blade, hub surface boundary-layer and the stream pressure outside boundary-layer are identical, and the air velocity inside boundary-layer is along with reducing to the close of hub surface, and trend towards zero.Thus inside boundary-layer, there is transverse-pressure gradient, but but there is no the centrifugal force of (or seldom having) air-flow, then the transverse gradients pressure of boundary-layer can not be balanced, gas in boundary-layer there will be the horizontal mobility that the concave surface from a blade flows to the convex surface of adjacent blades, the pressure in boundary-layer near forward face decreases, and near the convex surface of adjacent blades, pressure but increased, then define whirlpool.These whirlpools are taken away by primary air, and after blade tail end, these whirlpools are gradually converted into heat energy loss and fall.In order to reduce the loss of this portion of energy, in the middle of two blades, hub positions adds a strip baffle plate, can effectively hinder air-flow to carry out horizontal mobility, decrease the generation of whirlpool, improve the efficiency of blower fan, reduce fan noise.Baffle length is equal with chord length at blade root, and direction is parallel with chord length at blade root, and height is 1/10 that leaf is high.

Claims (2)

1. a noise reduction subtracts whirlpool axial flow blower, including driving motor, impeller, air duct and support, blade is distributed on impeller, it is characterised in that: blade distribution angle α in impeller circumference determines as the following formula: α=β+5.66sin β, and wherein β is to assume distribution angle when blade is equally spaced.
2. subtract whirlpool axial flow blower according to a kind of noise reduction described in claim 1, it is characterised in that: described blade is respectively equipped with several holes at trailing edge at wheel hub and air duct.
CN201620357017.7U 2016-04-26 2016-04-26 It makes an uproar to fall subtracts turboshaft stream fan Expired - Fee Related CN205639002U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105782090A (en) * 2016-04-26 2016-07-20 浙江理工大学 Noise-lowering and vortex-reducing axial flow fan
CN109026837A (en) * 2018-10-16 2018-12-18 王永挺 A kind of exhaust fan and its fan leaf

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105782090A (en) * 2016-04-26 2016-07-20 浙江理工大学 Noise-lowering and vortex-reducing axial flow fan
CN109026837A (en) * 2018-10-16 2018-12-18 王永挺 A kind of exhaust fan and its fan leaf
CN109026837B (en) * 2018-10-16 2024-02-13 王永挺 Exhaust fan and fan blade thereof

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20161012

Termination date: 20190426