TW201604079A - Propeller - Google Patents

Abstract

A propeller has a central point and is adapted to rotate along a rotation axis passing through the center point. The propeller includes a plurality of blades. Each of the blades has a center reference line. A projection of the center reference line on a virtual plane perpendicular to the rotation axis has first and second ends opposite to each other, the second end is located between the first end and the central point, and a generator line passes through the second end and the central point. A distance between the first end and the central point is R, and a distance between any position on the projection and the central point is r. A skew angle of a connection line between the mentioned any position and the central point relative to the generator line is y, wherein R ≥ r, x=r/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

This invention relates to a propeller, and more particularly to a propeller suitable for use in a ship.

In recent years, the developing countries have developed rapidly and their consumption power and demand for materials have been continuously improved, making trade between countries more and more popular. In addition to air cargo, state-to-state trade, such as bulk or heavy goods, still depend on ships for transportation, so the demand for ship transportation has increased in recent years.

Most of the current ships use propellers to drive fluid to drive the hull. Specifically, the propeller has a plurality of blades, and when the propeller rotates, there is a pressure difference between the high pressure surface and the low pressure surface of the blade, and the pressure difference forms a propulsive force to advance the hull on the water surface. In general, the blades of the propeller need to have sufficient area ratio to maintain good structural strength and provide sufficient propulsion of the hull. However, the blades with larger unfolded areas have correspondingly larger weight and surface area. This will increase the manufacturing cost and require a larger power to drive the propeller to operate normally.

The present invention provides a propeller whose blades maintain good structural strength with a small area ratio and provide sufficient propulsion for the hull.

The propeller of the present invention has a center point and is adapted to rotate about a rotational axis through the center 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 axis of rotation has opposite first and second ends, the second end being between the first end and the center point, and the reference line passing through the second end and the center point. The distance between the first end and the center point is R , and the distance between any position on the projection of the central reference line and the center point is r . The line connecting the center of the position to the center point with respect to the reference line is y , R r, , y 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +15.84, and y 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +21.84.

In an embodiment of the present invention described above ^{y = 524.35 x 6 -1995 x 5} +2894.5 x 4 -2041.4 x 3 +815.68 x 2 -195.81 x +18.84.

In an embodiment of the invention, each of the blades is skewed relative to a virtual plane.

In an embodiment of the invention, the circumference of the circular area on the virtual plane passes through the first end of each blade, the expanded area of the blades is A1 , and the area of the circular area is A2 , and .

In an embodiment of the invention, the R is between 2 meters and 5 meters.

Based on the above, in the present invention, the propeller, each blade skew (skew) is greater than the angle y is defined as equal to ^{524.35 x 6 -1995 x 5 +2894.5 x} 4 -2041.4 x 3 +815.68 x 2 -195.81 x +15.84 and less than Equivalent to 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +21.84, where R is the distance of the first end of the projection of the central reference line of each blade from the center point of the propeller, and r is any position of the projection of the central reference line and the center point distance. This allows the blade to have good structural strength while being designed to have a small expanded area ratio and to provide sufficient propulsion of the hull to reduce the manufacturing cost of the propeller. In addition, since the blade can have a smaller deployment area ratio as described above, the weight of the propeller is reduced and the surface area of the blade is reduced, so that the ship can drive the propeller to operate normally with less power, thereby saving the transportation cost of the ship.

The above described features and advantages of the invention will be apparent from the following description.

50‧‧‧ ship

52‧‧‧Powerplant

60‧‧‧ water surface

100‧‧‧propeller

110‧‧‧Axis

120‧‧‧ blades

a, b, c‧‧‧ curves

A‧‧‧ axis of rotation

A1 ‧ ‧ area and

A2 ‧ ‧ area

B‧‧‧Area

C‧‧‧ center point

D‧‧‧string length

D‧‧‧ Direction

E1‧‧‧ first end

E2‧‧‧ second end

H‧‧‧ distance

Projection of the L1‧‧‧ central reference line

L2‧‧‧ baseline

L3‧‧‧ connection

L4‧‧‧ arch arc

P‧‧‧ position

r , R ‧‧‧ distance

S‧‧‧ virtual plane

T‧‧‧ thickness

y ‧‧‧歪 angle

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view of a propeller applied to a ship according to an embodiment of the present invention.

Figure 2 is a front elevational view of the propeller of Figure 1.

3 is a partial structural view of the propeller of FIG. 2.

4 is a graph showing the distribution curve of the skew angle of the blade of FIG. 3.

Fig. 5 is a cross-sectional view showing a portion of the structure of the propeller of Fig. 1.

Figure 6 is a cross-sectional view of each of the blades of Figure 1 .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view of a propeller applied to a ship according to an embodiment of the present invention. Figure 2 is a front elevational view of the propeller of Figure 1. Referring to Figures 1 and 2, the propeller 100 of the present embodiment is adapted to be disposed on a vessel 50, such as a freighter or other type of vessel. The propeller 100 includes a shaft portion 110 and a plurality of blades 120 that are axially symmetrically coupled to the shaft portion 110 and that are coupled to the power unit 52 of the vessel 50. The number of vanes may be five or other suitable quantities as shown in Fig. 2, which is not limited by the present invention. When the vessel 50 sails on the surface 60, the propeller 100 located below the surface 60 is rotated by the drive of the power unit 52 to generate propulsion to cause the vessel 50 to advance in the direction D.

3 is a partial structural view of the propeller of FIG. 2. Referring to FIG. 3, the propeller 100 (shown in FIGS. 1 and 2) of the present embodiment has a center point C and is adapted to be rotated by a rotation axis of the center point C (shown as rotation axis A in FIG. 1). The propulsion of the vessel 50 is provided by the blades 120, wherein the axis of rotation A is parallel to the direction D. Each blade 120 has a center reference line with a projection L1 on a virtual plane perpendicular to the axis of rotation A. The projection L1 of the central reference line has a first end E1 and a second end E2. The second end E2 is located between the first end E1 and the center point C of the propeller 100, and the generating line L2 is passed. A straight line of the second end E2 and the center point C. The distance between the first end E1 and the center point C is R , and the distance between any position P on the projection L1 of the central reference line and the center point C is r , where R r and . Figure 3 only illustratively illustrates a position P, which may be any other location on the projection L1 of the central reference line. The skew angle of the line L3 between the any position P and the center point C with respect to the reference line L2 is y . The above R value can be adjusted to an appropriate value between 2 meters and 5 meters according to the size, weight and other design parameters of the hull, but the invention is not limited thereto.

4 is a graph showing the distribution curve of the skew angle of the blade of FIG. 3. In Fig. 4, curve a to curve c represent three distribution patterns of the blade's skew angle, and curve a is a function y = 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +21.84 , curve b is the function y = 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +15.84, curve c is the function y = 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ - 2041.4 x ³ +815.68 x ² -195.81 x +18.84. The skew angle y of this embodiment is defined as being between the function represented by the curve a and the function represented by the curve b. That is, the skew angle is defined as follows: y 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +15.84, y 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +21.84.

It has been experimentally confirmed that by defining the skew angle of each blade 120 of the propeller 100, the cavitation occurring around the periphery of the blade 120 can be effectively suppressed or retarded, and the blade 120 can be designed to have a smaller deployment area ratio. In the case of the area ratio, it still has good structural strength and can provide sufficient propulsion of the hull of the ship 50 to reduce the manufacturing cost of the propeller 100. In addition, since the blade 120 can have a smaller deployment area ratio as described above to reduce the weight of the propeller 100 and reduce the surface area of the blade 120, the ship 50 can drive the propeller 100 to operate normally with less power, thereby saving the ship. transportation cost. Furthermore, by defining the skew angle of each blade 120 of the propeller 100, the ship 50 can be reduced due to the action of the propeller 100 during navigation. The excitement of life. In a preferred embodiment, the skew angle of each blade 120 is defined, for example, as a function of the curve b, although the invention is not limited thereto.

Fig. 5 is a cross-sectional view showing a portion of the structure of the propeller of Fig. 1. Further, in the propeller 100 of the present embodiment, the blade 120 is, for example, skewed relative to the virtual plane (indicated as a virtual plane S in FIG. 5) as shown in FIGS. 1 and 5 to increase the snail. The structural strength of the paddle 100. In addition, in the present embodiment, the circumference of the circular area B (shown in FIG. 2) on the virtual plane S passes through the first end E1 of each blade 120 (shown in FIG. 3), and the area in which the blades 120 are deployed The sum is A1 and the area of the circular area B is A2 . The expanded area ratio of the blade 120 is defined, for example, as a ratio of A1 and A2 , and in the present embodiment, the range is, for example: The weight of the propeller 100 is reduced and the surface area of the blade 120 is reduced by this smaller unfolded area ratio. However, the present invention does not limit the size of this ratio.

Other design parameters of each of the blades 120 of the present embodiment will be exemplified below by way of drawings. Figure 6 is a cross-sectional view of the blade of Figure 1. Referring to FIG. 6, in the embodiment, each blade 120 has a camber line L4, and a distance H between the arch line L4 and the reference line L2 is defined as the camel of the blade 120. Not limited to this.

In summary, in the propeller of the present invention, the skew angle y of each blade is defined as 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +15.84 And less than or equal to 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +21.84, where R is the distance of the first end of the projection of the central reference line of each blade from the center point of the propeller, and r is any position of the projection of the central reference line and the center point distance. This can effectively suppress or delay the cavitation occurring at the periphery of the blade, and can make the blade have good structural strength while being designed to have a small expansion area ratio and can provide sufficient urging force of the hull to reduce the snail. The manufacturing cost of the paddle. In addition, since the blade can have a smaller deployment area ratio as described above, the weight of the propeller is reduced and the surface area of the blade is reduced, so that the ship can drive the propeller to operate normally with less power, thereby saving the transportation cost of the ship. Furthermore, the blades of the propeller can be designed to be skewed to further increase the structural strength of the propeller.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

a, b, c‧‧‧ curves

Claims (5)

a propeller having a center point and adapted to rotate about an axis of rotation through the center point, the propeller comprising: a plurality of blades each having a central reference line, the central reference line being perpendicular to a projection on a virtual plane of the axis of rotation has an opposite first end and a second end, the second end being located between the first end and the center point, a reference line passing through the second end and the a center point, the distance between the first end and the center point is R , and the distance between any position on the projection of the central reference line and the center point is r , and the connection between the position and the center point is relative to The baseline has a skew angle of y , where R r , , y 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +15.84, and y 524.35 x ⁶ -1995 x ⁵ +2894.5 x ⁴ -2041.4 x ³ +815.68 x ² -195.81 x +21.84. The patentable scope of the application of paragraph 1 propeller, where ^{y = 524.35 x 6 -1995 x 5} +2894.5 x 4 -2041.4 x 3 +815.68 x 2 -195.81 x +18.84. The propeller of claim 1, wherein each of the vanes is skewed relative to the virtual plane. The propeller of claim 1, wherein a circumference of a circular area on the virtual plane passes through the first end of each of the blades, and an expanded area of the blades is A1 , the circular area The area is A2 , and . The propeller of claim 1, wherein R is between 2 meters and 5 meters.