CN105270587A - Screw propeller - Google Patents

Abstract

The invention discloses a propeller, which has a central point and is suitable for rotating by a rotating axis passing through the central point. The propeller includes a plurality of blades. Each blade has a central reference line. A projection of the central reference line on a virtual plane perpendicular to the rotation axis has opposite first and second ends, the second end is located between the first end and the central point, and the reference line passes through the second end and the central point. The distance between the first end and the central point is R, and the distance between any position on the projection of the central reference line and the central point is R. The inclination angle of the connection line of any position and the central point relative to the datum line is y, wherein R is more than or equal to R,y≥524.35x⁶-1995x⁵+2894.5x⁴-2041.4x³+815.68x²-195.81x +15.84 and y ≦ 524.35x⁶-1995x⁵+2894.5x⁴-2041.4x³+815.68x²-195.81x+21.84。

Description

Propeller

Technical field

The present invention relates to a kind of propeller, and particularly relate to a kind of propeller being applicable to boats and ships.

Background technology

In recent years, developing country develop rapidly and its consumptive power with the demand of goods and materials is constantly promoted, make trade day by day hot network between state and state.Between state and state, trade is except being dependent on airfreight, and goods that is large or heavier-weight still needs to be dependent on such as boats and ships and transports, and be therefore growing on and in recent years for the demand of Shipping in various countries.

Current boats and ships are navigate by water to drive hull with propeller carry fluid mostly.Specifically, propeller has multiple blade, and can cause between the high-pressure side of blade and low pressure surface when propeller rotates and there is difference of pressure, this difference of pressure forms propulsive force and advances on the water surface to make hull.In general, the blade of propeller need have enough expanded area ratios (arearatio) to maintain good structural strength and the propulsive force providing hull enough, but larger its weight of blade of developed area and face area are also correspondingly comparatively large, so can increase manufacturing cost and larger power need be used can to drive propeller normal operation.

Summary of the invention

The object of the present invention is to provide a kind of propeller, its blade can maintain good structural strength when having less expanded area ratio (arearatio), and the propulsive force that hull can be provided enough.

For reaching above-mentioned purpose, propeller of the present invention has a center-point and is suitable for rotating with the pivot center by center-point.Propeller comprises multiple blade.Each blade has center reference line.Center reference line has first and second relative end perpendicular to the projection on a virtual plane of pivot center, and the second end is between the first end and center-point, and datum line is by the second end and center-point.The distance of the first end and center-point is R, and any position in the projection of center reference line and the distance of center-point are r.The online angle of skew relative to datum line of described any position and center-point is y,

R≥r， $x=\frac{r}{R}$

Y>=524.35x ⁶-1995x ⁵+ 2894.5x ⁴-2041.4x ³+ 815.68x ²-195.81x+15.84, and

y≤524.35x ⁶-1995x ⁵+2894.5x ⁴-2041.4x ³+815.68x ²-195.81x+21.84。

In one embodiment of this invention, above-mentioned

y＝524.35x ⁶-1995x ⁵+2894.5x ⁴-2041.4x ³+815.68x ²-195.81x+18.84。

In one embodiment of this invention, above-mentioned each blade is relative to virtual plane deflection.

In one embodiment of this invention, the circumference of the border circular areas on above-mentioned virtual plane by the first end of each blade, the developed area of these blades and be A1, the area of border circular areas is A2, and $0.45\≤\frac{A1}{A2}\≤0.7.$

In one embodiment of this invention, above-mentioned R is between 2 meters and 5 meters.

Based on above-mentioned, in propeller of the present invention, crooked (skew) angle y of each blade is defined as and is more than or equal to 524.35x ⁶-1995x ⁵+ 2894.5x ⁴-2041.4x ³+ 815.68x ²-195.81x+15.84 and be less than or equal to 524.35x ⁶-1995x ⁵+ 2894.5x ⁴-2041.4x ³+ 815.68x ²-195.81x+21.84, wherein r is the distance of described first end of the described projection of the center reference line of each blade and the center-point of propeller, and r is any position of the described projection of described center reference line and the distance of described center-point.Blade is so made still to have good structural strength when being designed to have less expanded area ratio and the propulsive force that hull can be provided enough, to reduce the manufacturing cost of propeller.In addition, alleviate the weight of propeller because blade as above can have less expanded area ratio and decrease the face area of blade, therefore boats and ships use less power just can drive propeller normal operation, and then saving ship transportation.

For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and the accompanying drawing appended by coordinating is described in detail below.

Accompanying drawing explanation

Fig. 1 is the lateral plan being applied to boats and ships of the propeller of one embodiment of the invention;

Fig. 2 is the front elevation of the propeller of Fig. 1;

Fig. 3 is the part-structure schematic diagram of the propeller of Fig. 2;

Fig. 4 is the distribution curve of the angle of skew of the blade of Fig. 3;

Fig. 5 is the part-structure cutaway view of the propeller of Fig. 1;

Fig. 6 is the cutaway view of each blade of Fig. 1.

Nomenclature

50: boats and ships

52: engine installation

60: the water surface

100: propeller

110: axle portion

120: blade

A, b, c: curve

A: pivot center

A1: area and

A2: area

B: region

C: center-point

D: chord length

D: direction

E1: the first end

E2: the second end

H: distance

L1: the projection of center reference line

L2: datum line

L3: online

L4: arch camber line

P: position

R, R: distance

S: virtual plane

T: thickness

Y: angle of skew

Detailed description of the invention

Fig. 1 is the lateral plan being applied to boats and ships of the propeller of one embodiment of the invention.Fig. 2 is the front elevation of the propeller of Fig. 1.Please refer to Fig. 1 and Fig. 2, the propeller 100 of the present embodiment is suitable for being configured at boats and ships 50, and boats and ships 50 are such as the boats and ships of cargo ship or other kind.Propeller 100 comprises an axle portion 110 and multiple blade 120, and these blades 120 are connected to axle portion 110 axisymmetrically, and axle portion 110 is connected to the engine installation 52 of boats and ships 50.The quantity of blade can be illustrated in figure 2 five or other right quantity, and the present invention is not limited this.When boats and ships 50 navigate by water on the water surface 60, the propeller 100 be positioned under the water surface 60 is rotated by the driving of engine installation 52, drives boats and ships 50 to advance along direction D to produce propulsive force.

Fig. 3 is the part-structure schematic diagram of the propeller of Fig. 2.Please refer to Fig. 3, the propeller 100 (being shown in Fig. 1 and Fig. 2) of the present embodiment is had a center-point C and is suitable for be rotated by a pivot center (Fig. 1 is denoted as pivot center A) of center-point C and provides boats and ships 50 propulsive force by blade 120, and wherein pivot center A is parallel to described direction D.Each blade 120 has center reference line (centerreferenceline), and described center reference line has projection L1 perpendicular on a virtual plane of pivot center A.The projection L1 of described center reference line has the first relative end E1 and the second end E2, second end E2 is between the first end E1 and the center-point C of propeller 100, and datum line (generatingline) L2 is the straight line by the second end E2 and center-point C.The distance of the first end E1 and center-point C is R, and any position P on the projection L1 of described center reference line and the distance of center-point C are r, wherein R>=r and fig. 3 is only exemplary shows a position P, and in fact position P can be other any position on the projection L1 of described center reference line.The online L3 of described any position P and center-point C is y relative to crooked (skew) angle of datum line L2.The suitable numerical value that above-mentioned R value can be adjusted between 2 meters and 5 meters according to the size of hull, weight and other design parameters, but the present invention is not as limit.

Fig. 4 illustrates the distribution curve of the angle of skew of the blade of Fig. 3.In the diagram, curve a ~ curve c represents three kinds of distribution modes of the angle of skew of blade, and curve a is function y=524.35x ⁶-1995x ⁵+ 2894.5x ⁴-2041.4x ³+ 815.68x ²-195.81x+21.84, curve b are function y=524.35x ⁶-1995x ⁵+ 2894.5x ⁴-2041.4x ³+ 815.68x ²-195.81x+15.84, curve c are function y=524.35x ⁶-1995x ⁵+ 2894.5x ⁴-2041.4x ³+ 815.68x ²-195.81x+18.84.The angle of skew y of the present embodiment is defined as between representated by function representated by curve a and curve b between function.That is described angle of skew defines as follows:

y≥524.35x ⁶-1995x ⁵+2894.5x ⁴-2041.4x ³+815.68x ²-195.81x+15.84，

y≤524.35x ⁶-1995x ⁵+2894.5x ⁴-2041.4x ³+815.68x ²-195.81x+21.84。

Confirm through experiment, above-mentioned defining is carried out by the angle of skew of each blade 120 by propeller 100, can effectively suppress or delay the cavitation phenomenon that blade 120 periphery occurs, and blade 120 can be made when being designed to still have good structural strength when having less expanded area ratio (arearatio) and the propulsive force that the hull of boats and ships 50 can be provided enough, to reduce the manufacturing cost of propeller 100.In addition, alleviate the weight of propeller 100 because blade 120 as above can have less expanded area ratio and reduce the face area of blade 120, therefore boats and ships 50 use less power just can drive propeller 100 normal operation, and then save ship transportation.Moreover, the angle of skew of each blade 120 of propeller 100 is carried out above-mentioned defining, the disturbance force produced because of propeller 100 start when boats and ships 50 navigate by water can be reduced.In a preferred embodiment, the angle of skew of each blade 120 is such as defined as the function meeting described curve b, but the present invention is not as limit.

Fig. 5 is the part-structure cutaway view of the propeller of Fig. 1.Furthermore, in the propeller 100 of the present embodiment, blade 120 is such as shown in Figures 1 and 5 relative to described virtual plane (Fig. 5 is denoted as virtual plane S) deflection (rake), to increase the structural strength of propeller 100.In addition, in the present embodiment, the circumference of the border circular areas B (being illustrated in Fig. 2) on described virtual plane S by the first end E1 (being shown in Fig. 3) of each blade 120, the area that these blades 120 launch and be A1, and the area of border circular areas B is A2.The described expanded area ratio of blade 120 is such as defined as the ratio of A1 and A2, and its scope is such as in the present embodiment: alleviate the weight of propeller 100 with expanded area ratio less thus and reduce the face area of blade 120.But the present invention is not limited the size of this ratio.

Below by way of other design parameters of each blade 120 of accompanying drawing casehistory the present embodiment.Fig. 6 is the cutaway view of the blade of Fig. 1.Please refer to Fig. 6, in the present embodiment, each blade 120 has arch camber line (camberline) L4, and the distance H between arch camber line L4 and datum line L2 is defined as the sagitta (camber) of blade 120, but the present invention is not as limit.

In sum, in propeller of the present invention, crooked (skew) angle y of each blade is defined as and is more than or equal to 524.35x ⁶-1995x ⁵+ 2894.5x ⁴-2041.4x ³+ 815.68x ²-195.81x+15.84 and be less than or equal to 524.35x ⁶-1995x ⁵+ 2894.5x ⁴-2041.4x ³+ 815.68x ²-195.81x+21.84, wherein r is the distance of described first end of the described projection of the center reference line of each blade and the center-point of propeller, and r is any position of the described projection of described center reference line and the distance of described center-point.So can effectively suppress or delay the cavitation phenomenon that blade periphery occurs, and blade can be made still to have good structural strength when being designed to have less expanded area ratio and the propulsive force that hull can be provided enough, to reduce the manufacturing cost of propeller.In addition, alleviate the weight of propeller because blade as above can have less expanded area ratio and decrease the face area of blade, therefore boats and ships use less power just can drive propeller normal operation, and then saving ship transportation.Moreover, can be deflection by each blade design of propeller, to increase the structural strength of propeller further.

Although disclose the present invention in conjunction with above embodiment; but itself and be not used to limit the present invention; have in any art and usually know the knowledgeable; without departing from the spirit and scope of the present invention; a little change and retouching can be done, therefore being as the criterion of should defining with the claim of enclosing of protection scope of the present invention.

Claims (5)

1. a propeller, this propeller has a center-point and is suitable for rotating with the pivot center by this center-point, and this propeller comprises:

Multiple blade, respectively this blade has a center reference line, this center reference line has one first relative end and one second end perpendicular to the projection on a virtual plane of this pivot center, this second end is between this first end and this center-point, one datum line is by this second end and this center-point, the distance of this first end and this center-point is R, any position in this projection of this center reference line and the distance of this center-point are r, the online angle of skew relative to this datum line of this any position and this center-point is y, wherein R>=r

Y>=524.35x ⁶-1995x ⁵+ 2894.5x ⁴-2041.4x ³+ 815.68x ²-195.81x+15.84, and

y≤524.35x ⁶-1995x ⁵+2894.5x ⁴-2041.4x ³+815.68x ²-195.81x+21.84。

2. propeller as claimed in claim 1, wherein

y＝524.35x ⁶-1995x ⁵+2894.5x ⁴-2041.4x ³+815.68x ²-195.81x+18.84。

3. propeller as claimed in claim 1, wherein respectively this blade relative to this virtual plane deflection.

4. propeller as claimed in claim 1, the circumference of the border circular areas wherein on this virtual plane by this first end of each this blade, the developed area of those blades and be A1, the area of this border circular areas is A2, and $0.45\≤\frac{A1}{A2}\≤0.7.$

5. propeller as claimed in claim 1, wherein R is between 2 meters and 5 meters.