CN2086337U - Fan vane type with wide gas flow - Google Patents

Abstract

The utility model relates to a fan vane type with wide gas flow. The utility model is characterized in that the vane camber is a composite ternary quadric camber, which can satisfy the function Y=a (r-c) +[2]-b theta +[2], wherein, a, b, and c are three constants, and r and theta are two independent variables. The basic exterior of the vane is a sector which concaves onwards and curves to the negative direction of the gas flow along the radial direction. The utility model can generate uniform rheologic wide gas flow field, which varies slowly at the point of the vane. The utility model has high efficiency, low noise, easy machining and manufacture, and wide function; besides working according to the air supply mode, the utility model can also work according to the air suction mode; the utility model can be used for fields of various domestic electric fans, exhaust fans, smoke exhaust ventilators, air conditioners, and various industry blowers.

Description

Fan vane type with wide gas flow

The utility model relates to a kind of fan vane type that can produce the wide-angle air-flow.

The conventional fan blade profile is to adopt cylndrical surface or conical surface at present, and its shortcoming is that airflow field changes greatly at the fan blade place, and the air draught district is the free flow field by the Flow Field Distribution of confluxing, blow zones is cylindrical flow field, and in the bigger eddy current loss of fan blade place generation, in addition, strong excessively at the wind-force that blow zones produced, when carrying out work by air-breathing mode, the airflow field bending is bigger, causes bigger loss of velocity, when carrying out work by the mode of supplying gas, make the wind district narrower, the working efficiency of fan is reduced.In order to enlarge the air-flow angle that domestic electric fan is supplied gas, many people have carried out particular study, the structure shape of fan blade strives for improvement, adopt arc or arc distortion flabellum as Chinese patent application 85204422U, but concrete blade profile function is not provided, brought inconvenience to manufacturing, it can not form the wide-angle airflow field of even rheology simultaneously, air-flow changes complicated at the fan blade place, easily produce bigger eddy current loss and noise, and working efficiency is lower.

Task of the present utility model provides a kind of fan vane type that produces the wide-angle air-flow, its blade face curved surface is a compound ternary conicoid, an and satisfied functional relation, make airflow field in inspiratory direction and supply gas direction all to external diffusion, and form the airflow field of even rheology, reduce eddy current loss and reduce noise, make working efficiency higher, and be convenient to manufacturing.

The technical solution of the utility model is:

1, spoon of blade is a compound ternary conicoid, satisfies Function Y=a(r-c) ²-b θ ²Its a, b, c are three constants, three constant a, b, c and true origin are selected according to the fan type with to the requirement of the diffusion angle of wide-angle air-flow, and r, θ are two independents variable, and the basic external form of the blade of fans is preceding recessed and radially to the crooked in the other direction fan type of air-flow.

2, blade is on the work sense of rotation, and the radius of curvature of the circumference displaypattern of flabellum increases progressively by the function rule after by forward direction.

3, the transversal of spoon of blade by in preceding backward extension stretch, be backward type and distribute.

4, the radial line of spoon of blade is crooked in the other direction to air-flow from the inside to the outside, and its radius of curvature increases progressively from inside to outside by the function rule.

Circumference of the present utility model is the same crooked on airflow direction with traditional flabellum, and keep certain preceding angle of attack, its effect is to produce the axial flow velocity component, and different is that its radius of curvature changes by the function rule, can reduce eddy current loss like this and reduce noise.The acting in conjunction of spoon of blade transversal and radial line provides the radially outside airspeed component of air-flow, and the air feed flow field forms the wide-angle airflow field of even rheology to external diffusion.

Below in conjunction with accompanying drawing two embodiments of the present utility model are described in detail:

Fig. 1, desk fan fan blade plan view.

Fig. 2, the gentle Flow Field Distribution schematic representation of desk fan fan blade A-A section.

Fig. 3, desk fan fan blade circumferential section unfolded drawing.

Fig. 4, desk fan fan blade radial section figure.

Fig. 5, desk fan fan blade circumference distribution unfolded drawing.

Fig. 6, desk fan fan blade radial line distribution map.

Fig. 7, the Blade for ceiling fan front elevation.

Fig. 8, Blade for ceiling fan circumference distribution unfolded drawing.

Fig. 9, Blade for ceiling fan radial line distribution map.

Embodiment one:

To the leaf structure of desk fan fan blade shown in Figure 6, spoon of blade is a compound ternary conicoid by Fig. 1, satisfies Function Y=a(r-c) ²-b θ ²The basic external form of blade is preceding recessed and radially to the crooked in the other direction fan type of air-flow, Y in the functional relation, r, θ is three variablees, a, b, c is three constants of determining on demand, Function Y is got different values with the variation of independent variable r and θ, coordinate (the r of the pairing point of function, θ, Y) be in specific space polar coordinate system, to obtain, this system of coordinates is to be made of with vertical coordinate axis Y polar angle θ and r-θ plane, r determined polar coordinates plane, utmost point footpath by one, here the spy makes following regulation, Y-axis is parallel to the electric fan rotating shaft, its postive direction is opposite with airflow direction, r-θ plane, polar coordinates plane is vertical with Y-axis, and the postive direction of polar angle θ and fan blade direction of rotation are corresponding to the initial point of this space polar coordinates system, r=0 and Y=0 are arranged, the offset at Y-axis countershaft center depends on the electric fan kind, and in the wide blade profile electric fan of desk fan one class, off-centre is measured null value, in the present embodiment promptly, Y-axis fixes on the shaft centerline.

As shown in Figure 1, take up an official post and get a bit (P) in the blade face, and then point (P) satisfies Function Y=a(r-c) ²-b θ ², pairing coordinate values is r=r ₁, θ=θ ₁, and Y=Y ₁, be reference with the shaft centerline, the pairing position of point (P) is angle [alpha]=α ₁And radius R=R ₁, getting the most preceding line with the rotating shaft center in blade air inlet front is the position of α=0, R=R ₁, be the distance of point (P) to shaft centerline.Should there be a leading angle θ θ=0 than α=0 in the polar coordinates system ₀, θ ₀Be initial angle, so r is arranged ₁=R ₁And θ ₁=θ ₀+ α ₁

Fig. 2 represents the gentle Flow Field Distribution schematic representation of the A-A section of blade, and airflow field (W) to external diffusion, becomes the wide-angle airflow field of continuous rheology at airintake direction and outgassing direction.

As shown in Figure 1, in order to describe the structure shape of blade in detail, can observe from three cutting planes, circumferential surface is to be the axle center with the shaft centerline, and radius is the cylndrical surface of R, and radial section is the plane by shaft centerline, the cross-section is perpendicular to the plane of shaft centerline, can investigate the shape of spoon of blade with division lines method, cut mutually with the blade face with three above-mentioned cutting planes, can obtain three transversals: with R=R by (P) more arbitrarily ₁Circumferential surface intercepting circumference (1), with α=α ₁Radial section intercepting radial line (2); With Y=Y ₁Cross-section intercepting transversal (3).

Locational blade circumferential section unfolded drawing at circumference shown in Figure 1 (1), as shown in Figure 3, the circumferential section of blade equally has the certain preceding angle of attack and camber with traditional fans, to produce the axial flow velocity component, its camber and the preceding angle of attack depend on number of blade n, polar coordinates initial angle θ ₀With the constant b in the blade profile function, should be by value in the following scope:

n＝3； θ ₀＝5～15°； b＝0.02～0.04D

n＝4； θ ₀＝5～15°； b＝0.015～0.025D

n＝6； θ ₀＝5～10°； b＝0.01～0.02D

Wherein D is the fans diameter

Fig. 5 represents the distribution unfolded drawing of the circumference (1) of each radial location, and circumference (1) its camber and the preceding angle of attack from inside to outside successively decreases.

Different with traditional flabellum is, the radius of curvature of circumference (1) can reduce eddy current loss like this and reduce noise increasing progressively by the function rule after by forward direction on the sense of rotation.

The locational radial section figure of the radial line among Fig. 1 (2) as shown in Figure 4, blade is crooked in the other direction to air-flow from the inside to the outside diametrically, can produce a radially outside airspeed component like this, make airflow field (W) in the direction upper edge radially outward diffusion of supplying gas, according to the principle of air-flow continuous-flow, airflow field (W) on inspiratory direction also radially to external diffusion.Continuously the wide-angle airflow field (W) of rheology comes to this and forms.Fig. 6 represents the radial line distribution map of variant angular orientation, the radius of curvature of radial line (2) increases progressively by the function rule from inside to outside, wide-angle airflow field (W) is evenly distributed, and obtain the continuous flow field (W) of even rheology, the degree that radial line (2) is crooked depends on constant a and c, and determining the opening angle of wide-angle airflow field (W), should get a=0.000033～0.000045D; C=0.15～0.25D.

Transversal shown in Figure 1 (3) reflects true shape, be characterized in being backward type configuration, promptly transversal (3) on sense of rotation by in preceding backward extension stretch, like this when blade rotation, air except direct-axis to flowing, also outwards flow along transversal (3).

Fig. 1 also expresses one group of transversal by Y=-0.05D～0.15D, and transversal (3) and radial line (2) acting in conjunction have just produced wide-angle airflow field (W).

Should point out circumference (1), radial line (2) and transversal (3) are to be distributed in continuously on the whole blade curved surface by the function rule, and constitute spoon of blade, and above-mentioned three kinds of transversals are not individualism.

Embodiment two.

The front elevation of Blade for ceiling fan as shown in Figure 7, there is an eccentric amount e at tangent line that the blade front is the most preceding and rotating shaft center, then polar coordinates initial point (O) should be taken at parallel with above-mentioned tangent line, and on the straight line by the rotating shaft center, initial point (O) is on the position of fan blade reverse extending length f, should get f=0.5～0.75D, θ=0 is taken on the link position of initial point (O) and the most preceding point of blade root or leading 1～3 °, ceiling fan blade profile function is similar with desk fan, constant a only, b, c span difference, should get a=0.00002～0.00003D, b=0.02D～0.03D, C=f+0.05～0.1D.

Fig. 9 represents the distribution map of radial line (2) two angles, and radial line (2) is crooked in the other direction to air-flow from the inside to the outside.

Fig. 8 represents the distribution map of the circumference (1) of diverse location.

In Fig. 8 and Fig. 9,, Y-axis is moved on the position at rotating shaft center by point (O) for the ease of observing.

For the distribution of the preceding angle of attack of regulating circumference, fan blade shown in Figure 1 front is back curved, and the fan blade front also can be linear, and this will see the needs of wind distribution, no matter take the sort of form, spoon of blade is all by Function Y=a(r-c) ²-b θ ²Change, also the drawn transversal (3) of one group of Y=0 to Y=0.16D of Fig. 1, it is recessed to different with desk fan, and this is owing to the polar coordinates initial point does not cause on the position at rotating shaft center, but a common feature is all arranged, and is exactly that transversal (3) all distributes by backward type.

The utility model has the advantage of that the blade face curved surface is a compound ternary quadratic surface, satisfies function Y=a(r-c)²－bθ ²Make airflow field in inspiratory direction and supply gas direction all to external diffusion, and form the wide gas flow field of even rheology, airflow field changes gentle at the blade place, can reduce eddy current loss and reduce noise, make operating efficiency higher, because r, θ are independent variable, a, b, c are the constant of selecting as required, and function namely is easy to adjust and control, so be convenient to processing and manufacturing, except working by the mode of supplying gas, also can be by inspiratory direction work, of many uses, can be used for the fields such as various domestic electric fans, exhaust fan, smoke exhaust ventilator, air-conditioner and various industrial fans.

Claims (4)

1, a kind of fan vane type that produces the wide-angle air-flow is characterized in that spoon of blade is a compound ternary conicoid, satisfies Function Y=a (r-c) ²-b θ ², wherein a, b, c are three constants, and three constant a, b, c and true origin are selected according to the fan type with to the requirement of the diffusion angle of wide-angle air-flow, and r, θ are two independents variable, and the basic external form of blade is preceding recessed and radially to the crooked in the other direction fan type of air-flow.

2, a kind of fan vane type that produces the wide-angle air-flow according to claim 1 is characterized in that blade on the work sense of rotation, and the radius of curvature of the circumference displaypattern of flabellum increases progressively by the function rule after by forward direction.

3, a kind of fan vane type that produces the wide-angle air-flow according to claim 1, the transversal that it is characterized in that spoon of blade by in preceding backward extension stretch, be backward type and distribute.

4, a kind of fan vane type that produces the wide-angle air-flow according to claim 1 is characterized in that the radial line of spoon of blade is crooked to air-flow from the inside to the outside in the other direction, and its radius of curvature increases progressively from inside to outside by the function rule.

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