CN1278047C - Turbine fan - Google Patents

Abstract

The present invention relates to a turbofan. In the turbofan, a plurality of novel blades are radially and vertically arranged between a main plate and a baffle plate, the vertical projection plane of each blade forms a wing shape, two side surfaces of the main body part of each blade are provided with a convex positive-pressure surface and a concave negative-pressure surface, and a turbulent flow preventing part of the positive-pressure surface at the front end, which is formed because of a bulge, is arranged at the side of the positive-pressure surface at the front end part of the main body part; a turbulent flow preventing part of the negative-pressure surface at the front end of the partial negative-pressure surface, which is formed because of a bulge, is arranged at the side of the negative-pressure surface of the front end of the main body part. By the structure of each blade of the present invention, the present invention can generate equivalent or more air quantity under the same condition or the power consumption reducing condition, and noise can be reduced. Thus, the turbofan which is manufactured by the ultrathin blades with the structures has the good efficacy that manufacturing cost and manufacturing time are reduced, and the weight of the whole turbofan is lightened.

Description

Turbofan

Technical field

The present invention relates to the turbofan in the ventilation plant of a kind of common engineering field, particularly relate to a kind of under the situation of keeping identical air quantity and power consumption, can reduce manufacturing cost, reduce production time, and can alleviate the turbofan (TURBO FAN) of the ultra-thin blade of whole fan weight.

Background technique

General blowing fan is the rotating force force feed air by blade and rotor, and is widely used on the products such as refrigerator, air cleaner and vacuum cleaner.

Above-mentioned blowing fan, the different and shape according to the air suction and the mode of derivation can be divided into axial fan, centrifugal cutter and turbofan.

In above-mentioned these fans, turbofan is that unique a kind of air that adopts flows into and fan by the blade mode from the direction of axle, has just adopted the mode by the radial derivation air in fan side.Because this working method makes air can flow into the inner and derivation of blower fan naturally, therefore, do not need extra pipeline.Relatively be suitable for large product, for example the top suction type air cleaner.

Seeing also Fig. 1 to shown in Figure 3, is the structure of existing turbofan, and Fig. 1 is the floor map of existing turbofan, and Fig. 2 is the side generalized section of existing turbofan, and Fig. 3 is the floor map of the blade vertical plane of existing turbofan.

As shown in Figure 1 to Figure 3, existing turbofan, it comprises: main body 1, form the bottom of main body 1 and the mainboard 2 of fan electromotor 5 is installed, along a plurality of blades 3 of mainboard 2 inner side surfaces at a distance of certain intervals, and the baffle plate 4 that is connected along blade 3 upper ends.

In order to suck air, the top of main body 1 forms and is provided with suction port 7, and intermediate portion forms in order to guide air the direction of discharge into and is provided with a passage 6, and lateral parts then forms and is provided with the exhaust port 8 that inhaled air is discharged.

Therefore, after fan electromotor 5 rotating drive, main body 1 begins rotation, and the blade 3 that drive and main body 1 link together rotates, and the air of outside enters by main body 1 following suction port 7, and is discharged to exhaust port 8 along passage 6.

In addition, the vertical plane of blade 3 is for forming wing blade (aerofoil), forms the pressure surface 31 that protrudes and the suction surface 32 of depression in both sides, and is radial and is vertically mounted between mainboard 2 and the baffle plate 4.

Here said wing blade is meant that nineteen fifty is wing by the streamline of NACA (US Airways Advisory Board) exploitation, and this is the blade shape that comes out according to following Design Theory.

See also shown in Figure 4, it is existing turbofan is fastened expression blade vertical plane at right angled coordinates planimetric map, as the forward terminal O of blade inside end end points as initial point, and the virtual line of the aft terminal Z that connects initial point and blade outer ends end points formed a rectangular coordinate system as X-axis.

Above-mentioned wing blade theory (NACA4-Digit Aerofoil) is to utilize the thickness function y that describes vane thickness _t(thickness function:y _t) and describe formed parabolical ogive 33 function yc (the camberline function:y of its average thickness value _c), by following mathematical expression, be illustrated on the coordinate pressure surface and the formed parabola of suction surface of blade resulting.

At first, thickness function y _tAs mathematical expression 1:

[mathematical expression 1]

$y_t\left(x\right)=\frac{t_c}{0.2}(0.2969\sqrt{x}-0.126x-0.35160x^2+0.2843x^3-0.1015x^4)$

Ogive function y _cAs mathematical expression 2:

[mathematical expression 2]

P＞x 〉=0 o'clock, $y_c\left(x\right)=\frac{M}{P^2}(2\mathrm{Px}-x^2)$

P＜x≤1 o'clock, $y_c\left(x\right)=\frac{M}{{(1-P)}^2}(1-2P+2\mathrm{Px}-x^2)$

Here, M represents the Y coordinate of maximum arch, and p represents the X coordinate of maximum arch.

Therefore, the mathematical expression such as the mathematical expression 3 of expression blade parabola that pressure surface forms 31:

[mathematical expression 3]

x _u＝x-y _t(x)sinθ y _u＝y _c(x)+y _t(x)cosθ

Here

P＞x 〉=0 o'clock, $\mathrm{\θ}=\arctan 2\frac{M}{\sqrt{P}}(P-x)$

P＜x≤1 o'clock, $\mathrm{\θ}=\arctan 2\frac{M}{\sqrt{1-P}}(P-x)$

In addition, the mathematical expression such as the mathematical expression 4 of expression blade parabola that suction surface forms 32:

[mathematical expression 4]

x _l＝x+y _t(x)sinθ y _l＝y _c(x)-y _t(x)cosθ

Here, the θ value is with identical in the situation of above-mentioned blade parabola that pressure surface forms 31.

But according to the blade of aforesaid way made, because its thickness is thicker, therefore, the power consumption that has when same air quantity takes place reaches problems such as noise is big greatly.

This shows that above-mentioned existing turbofan still has many defectives, and demands urgently further being improved.

In order to solve the problem that above-mentioned turbofan exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.

Because the defective that above-mentioned existing turbofan exists, the inventor is based on being engaged in this type of product specification manufacturing abundant for many years practical experience and professional knowledge, actively studied innovation, in the hope of founding a kind of turbofan of new structure, can improve general existing on the market conventional turbofan structure, make it have more practicability.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.

Summary of the invention

Main purpose of the present invention is, overcome the defective that existing turbofan exists, and provide a kind of turbofan of new structure, technical problem underlying to be solved is to make it produce a kind of extra-thin blade, this blade is under the condition of identical or minimizing power consumption, can produce equivalent or more air quantity, and can reduce noise, therefore, feasible turbofan of coming out by this ultrathin blade made, have and to reduce manufacturing cost, reduce production time, and can alleviate the effect of whole fan weight.

Purpose of the present invention and to solve its technical problem underlying be to adopt following technological scheme to realize.A kind of turbofan according to the present invention's proposition, radial vertical installation is provided with a plurality of blades between its mainboard and baffle plate, described blade, its vertical plane forms the wing blade shape, has the main body that forms the suction surface of protruding pressure surface and depression in both sides; In the front end pressure surface side of described main body, the front end pressure surface turbulent flow with protruding formed part pressure surface prevents part; In the front end suction surface side of described main body, the front end suction surface turbulent flow with protruding formed part suction surface prevents part; Above-mentioned wing face is utilize to describe the thickness function yt of vane thickness and describe the formed parabolical ogive function yc of its average thickness value, the pressure surface of blade and the formed parabola of suction surface is illustrated in obtain on the coordinate,

Thickness function thickness function y wherein _tAs mathematical expression 1:

$y_t\left(x\right)=\frac{t_c}{0.2}(0.2969\sqrt{x}-0.126x-0.35160x^2+0.2843x^3-0.1015x^4)$

Y wherein _tThe expression vane thickness, t _cBe the maximum ga(u)ge value.

Ogive function y _cAs mathematical expression 2:

P＞x 〉=0 o'clock, $y_c\left(x\right)=\frac{M}{P^2}(2\mathrm{Px}-x^2)$

P＜x≤1 o'clock, $y_c\left(x\right)=\frac{M}{{(1-P)}^2}(1-2P+2\mathrm{Px}-x^2)$

Here, M represents the Y coordinate of maximum arch, and p represents the X coordinate of maximum arch.Therefore, represent that the blade pressure surface forms parabolical mathematical expression 3 and is:

x _u＝x-y _t(x)sinθ y _u＝y _c(x)+y _t(x)cosθ

Here,

P＞x 〉=0 o'clock, $\mathrm{\θ}=\arctan 2\frac{M}{\sqrt{P}}(P-x)$

P＜x≤1 o'clock, $\mathrm{\θ}=\arctan 2\frac{M}{\sqrt{1-P}}(P-x)$

In addition, represent that the blade suction surface forms parabolical mathematical expression 4 and is:

x _l＝x+y _t(x)sinθ y _t＝y _c(x)-y _t(x)cosθ

Here, the θ value is with to form parabolical situation at described blade pressure surface identical;

And, described front end pressure surface turbulent flow prevents that the formed part pressure surface of part parabola from being made up of the coordinate of mathematical expression 3 gained, the Y-axis coordinate figure of its coordinate is bigger than the parabolical Y-axis coordinate figure of described main body pressure surface, described front end suction surface turbulent flow prevents that the formed part suction surface of part parabola from being made up of the coordinate of mathematical expression 4 gained, and the Y-axis coordinate figure of its coordinate is littler than the parabolical Y-axis coordinate figure of described main body suction surface.

The object of the invention to solve the technical problems can also adopt following technical measures further to realize.

Aforesaid turbofan, the front end turbulent flow of wherein said blade prevent that the length of the string of part from being below 40% of length of aforementioned body part string.

The present invention compared with prior art has tangible advantage and beneficial effect.By above technological scheme as can be known, turbofan of the present invention has following advantage at least:

Blade provided by the present invention under the condition of identical or minimizing power consumption, can produce equivalent or more air quantity, and can reduce noise.Therefore, by the turbofan that this ultra-thin leaf production comes out, can reduce manufacturing cost, reduce production time, and can alleviate the weight of whole fan.

In sum, the turbofan of special construction of the present invention, be designed to extra-thin blade, this blade can produce equivalent or more air quantity, and can reduce noise under the condition of identical or minimizing power consumption, therefore, make the turbofan of coming out, have and to reduce manufacturing cost, reduce production time, and can alleviate the good effect of whole fan weight by this ultrathin blade made.It has above-mentioned many advantages and use value, and in like product, do not see have similar structural design to publish or use, no matter and it structurally or bigger improvement all arranged on the function, have large improvement technically, and produced handy and practical effect, and have the effect of enhancement really, thus be suitable for practicality more, really be a new and innovative, progressive, practical new design.

Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.

The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.

Description of drawings

Fig. 1 is the floor map of existing turbofan.

Fig. 2 is the side generalized section of existing turbofan.

Fig. 3 is the floor map of the blade vertical plane of existing turbofan.

Fig. 4 is existing turbofan is fastened expression blade vertical plane at right angled coordinates a planimetric map.

Fig. 5 is the blade vertical plane floor map of turbofan of the present invention.

Fig. 6 is the floor map of the thicker blade of vertical projection face thickness.

Fig. 7 is the floor map of the blade of vertical plane thinner thickness.

The symbol description * * of major component among the * figure

O ... forward terminal Z ... aft terminal

C ... string 40 ... main body

41 ... pressure surface 42 ... suction surface

50 ... front end pressure surface turbulent flow prevents part 51 ... the part pressure surface

60 ... front end suction surface turbulent flow prevents part 61 ... the part suction surface

Embodiment

Below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of turbofan, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.

See also shown in Figure 5, it is the blade vertical plane floor map of turbofan of the present invention, the blade of turbofan of the present invention, its vertical plane becomes the wing blade shape, its structure characteristic is: two sides of its main body 40 form pressure surface 41 that is provided with protrusion and the suction surface 42 that caves in, and in front end pressure surface 41 sides of this main body 40, formation is provided with the front end pressure surface turbulent flow that forms part pressure surface 51 because of its projection and prevents part 50; In front end suction surface 42 sides of this main body 40, formation is provided with the front end suction surface turbulent flow that forms part suction surface 61 because of its projection and prevents part 60.

Here, the thickness of blade is thinner than original thickness in the main body 40, and just the front end pressure surface 41 of main body 41 and the turbulent flow that suction surface 42 is protruded prevent that part 50,60 from having kept original thickness.Like this, when reaching the purpose that the present invention will reduce vane thickness, the adverse factors such as formation of eddy current have also been prevented to greatest extent.

Now structural principle of the present invention is described in detail as follows.

Above-mentioned mathematical expression 3 and mathematical expression 4 are to try to achieve the formula that forms wing blade shape blade pressure surface and suction surface parabolic coordinates, and these are the value y according to thickness function 1 gained _tAnd come.Variable t according to the above-mentioned mathematical expression 1 of any change _c, we can obtain the pressure surface and the formed parabolical coordinate of suction surface of any thickness blade.

On the other hand,, can reduce the purpose of power consumption according to the weight that reduces blade, preferably reduce the thickness of blade, but the thickness of blade be thin excessively as far as possible in order to reach the saving raw material, can the eddy generation phenomenon at its front end.

Therefore, supposing to have as shown in Figure 6, maximum ga(u)ge is the blade of the thick wing blade shape of a, maximum ga(u)ge is the blade of the wing blade shape of b as shown in Figure 7, we can imagine that the shape that a kind of blade is, above-mentioned deathtrap front end is made as shown in Figure 6 thick shape, and remaining part is then made thin shape as shown in Figure 7.The blade structure that very economical vertical plane so just can be arranged as shown in Figure 5.

Above-mentioned such theory is represented with original wing blade pure mathematics formula, can be expressed as follows:

The same with original situation, as shown in Figure 4, with forward terminal O as initial point, and the virtual line that connects initial point and aft terminal Z as the rectangular coordinate system of X-axis as standard, suppose that the blade vertical plane is placed on above-mentioned rectangular coordinate system.

In the blade vertical plane, forward terminal O is meant the end points of blade inside end, and aft terminal Z is meant the end points of blade outer ends.

Form the pressure surface 41 of main body 40 and the parabola of suction surface 42, form by the coordinate of mathematical expression 3 and mathematical expression 4 gained respectively separately.According to the thickness of the profile of the blade of these parabola gained, within the scope that satisfies the wing blade theory, thin as far as possible being advisable.

On the other hand, form front end pressure surface turbulent flow and prevent that part 50 formed part pressure surfaces 51 and front end suction surface turbulent flow from preventing the parabola of part 60 formed part suction surfaces 61, also is made up of the coordinate of mathematical expression 3 and mathematical expression 4 gained.This situation with aforementioned body part 40 is consistent.As shown in Figure 5, this is in order to prevent the formation of eddy current, has been provided with a projection and form at the front end of blade, therefore, and according to the blade profile thickness of parabola gained, as long as be enough to prevent the formation of eddy current.

Therefore, relevant front end pressure surface turbulent flow prevents the Y-axis coordinate figure of part 50 formed part pressure surface 51 parabolic coordinates, and is bigger than the Y-axis coordinate figure of relevant main body 40 pressure surface parabolic coordinates.

In contrast, the plain stream of relevant front end suction surface prevents the Y-axis coordinate figure of part 60 formed part suction surface 61 parabolic coordinates, and is as far as possible littler than the Y-axis coordinate figure of the parabolic coordinates of relevant main body 40 suction surfaces.

On the other hand, if the front end turbulent flow prevents that the string D of part is long, then can desalinate the aim of the present invention that will reduce leaf weight.

Therefore, according to experimental result, this front end turbulent flow prevents that the length of string D of part from being being advisable below 40% of length of aforementioned body part string C.

The technological innovation of the turbofan of the present invention that above-mentioned structure like this constitutes all has many desirable reference parts for technician of the same trade now, and the progressive that possesses skills really.

The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified to the equivalent embodiment of equivalent variations, but every technical solution of the present invention content that do not break away from,, all still belong in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.

Claims (2)

1, a kind of turbofan is characterized in that:

Radial vertical installation is provided with a plurality of blades between its mainboard and baffle plate, described blade, and its vertical plane forms the wing blade shape, has the main body that forms the suction surface of protruding pressure surface and depression in both sides;

In the front end pressure surface side of described main body, the front end pressure surface turbulent flow with protruding formed part pressure surface prevents part;

In the front end suction surface side of described main body, the front end suction surface turbulent flow with protruding formed part suction surface prevents part;

Above-mentioned wing face is to utilize the thickness function y that describes vane thickness _tWith the formed parabolical ogive function y of its average thickness value of description _c, the pressure surface of blade and the formed parabola of suction surface be illustrated in obtain on the coordinate,

Thickness function thickness function y wherein _tAs mathematical expression 1:

$y_t\left(x\right)=\frac{t_c}{0.2}(0.2969\sqrt{x}-0.126x-0.35160x^2+0.2843x^3-0.1015x^4)$

Y wherein _tThe expression vane thickness, t _cBe the maximum ga(u)ge value.

Ogive function y _cAs mathematical expression 2:

P＞x 〉=0 o'clock, $y_c\left(x\right)=\frac{M}{P^2}(2\mathrm{Px}-x^2)$

P＜x≤1 o'clock, $y_c\left(x\right)=\frac{M}{{(1-P)}^2}(1-2P+2\mathrm{Px}-x^2)$

Here, M represents the Y coordinate of maximum arch, and p represents the X coordinate of maximum arch.

Therefore, represent that the blade pressure surface forms parabolical mathematical expression 3 and is:

x _u＝x-y _t(x)sinθ y _u＝y _c(x)+y _t(x)cosθ

Here,

P＞x 〉=0 o'clock, $\mathrm{\θ}=\arctan 2\frac{M}{\sqrt{P}}(P-x)$

P＜x≤1 o'clock, $\mathrm{\θ}=\arctan 2\frac{M}{\sqrt{1-P}}(P-x)$

In addition, represent that the blade suction surface forms parabolical mathematical expression 4 and is:

x _l＝x+y _t(x)sinθ y _l＝y _c(x)-y _t(x)cosθ

Here, the θ value is with to form parabolical situation at described blade pressure surface identical;

And described front end pressure surface turbulent flow prevents that the formed part pressure surface of part parabola from being made up of the coordinate of mathematical expression 3 gained, and the Y-axis coordinate figure of its coordinate is bigger than the parabolical Y-axis coordinate figure of described main body pressure surface,

Described front end suction surface turbulent flow prevents that the formed part suction surface of part parabola from being made up of the coordinate of mathematical expression 4 gained, and the Y-axis coordinate figure of its coordinate is littler than the parabolical Y-axis coordinate figure of described main body suction surface.

2, turbofan according to claim 1 is characterized in that the front end turbulent flow of wherein said blade prevents that the length of the string of part from being below 40% of length of aforementioned body part string.

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