KR20020096231A - A fishing boat propeller wing - Google Patents

Abstract

PURPOSE: A method for outputting a shape of a blade of a propeller for a fishing ship and a shape of a blade manufactured by the method are provided to improve the speed of a fishing sheep, to reduce the engine load, to save fuel, and to improve the durability of an engine by changing the position corresponding to the maximum blade width. CONSTITUTION: A blade(12) has a rear part of which upper portion is protruded and a front part protruded along the outer face. An extension(12a) of the front part and an extension(12b) of the rear part are formed on the outer face of the blade. To output the shape of the blade, the length from the center of a shaft(10) to one end of the blade is R. When R is divided into 10 parts, the maximum blade width is formed in the R of 0.55.

Description

Wing shape calculation method of propeller for fishing vessel and wing shape of propeller manufactured according to said calculation method {A FISHING BOAT PROPELLER WING}

The present invention relates to a propeller for a small fishing boat, and in particular, according to the method of calculating the blade shape of a propeller for fishing vessels capable of improving the propeller blade shape and improving the ship speed by 10% or more, It relates to the wing shape of the produced propeller.

In general, the propulsion power of the ship is obtained by rotating the fan wing type propeller connected to the propeller shaft of the prime mover mounted on the hull aft. That is, when the power generated from the engine installed inside the hull is transmitted to the thruster through the power transmission shaft, the thruster rotates to push out water so that the hull can move forward.

On the other hand, the wing shape of the above-described propeller is formed in the fan blade shape as shown in Fig. 3 and the maximum wing width is formed when R = 0.66, so that the engine exhaust temperature is higher than the factory condition (238 ° C). Remarkably high, there is also a problem that the engine speed and ship speed is falling.

Accordingly, an object of the present invention for solving the above problems is to provide a wing shape calculation method of the propeller for fishing vessels so that the maximum wing width is formed when R = 0.55.

Another object of the present invention is to provide a wing shape of the propeller produced according to the wing shape dimension table of the propeller shown in Table 1.

Another object of the present invention to provide a dimension table as shown in Table 1.

Another object of the present invention is to provide a wing shape of the propeller which can improve the ship speed by 10% or more by improving the wing of the AU type propeller widely used in small fishing vessels.

Still another object of the present invention is to provide a wing shape calculation method of a propeller for fishing vessels capable of lowering an engine load, saving fuel, and improving engine durability, and a wing shape of a propeller manufactured according to the calculation method.

The present invention according to the first aspect for achieving the object as described above has a shaft that receives power from the engine, and wings that are attached to the outer peripheral surface of the shaft rotates, the wing is based on the center line An upper portion protrudes and the green portion protrudes along the rim; Preferably, the wing shape of the propeller for fishing vessels formed on the rim surface of the wing protruding outward and protruding extension protruding outward from the center line.

According to a second aspect of the present invention for achieving the above object, the length from the center of the shaft of the propeller to one end of the blade is denoted by R, and when R is divided into ten, the maximum at R = 0.55. Allow wing widths to be formed; Calculate L (wing width) = 0.27D (rotation diameter) when the wing area ratio is 0.1, and then when the L value is 0.1 ≤ L ≤ 0.6 based on 100% when R = 0.55 The wing shape calculation method of the propeller for fishing vessels was implemented by calculating the wing shape such that the width ratio became larger and the wing width ratio became smaller when 0.6 <L ≤ 1.0.

At this time, more preferably, the blade shape is calculated using the blade shape table of the propeller shown in Table 1.

1 is a view showing a wing shape calculation method of the propeller for fishing vessels according to an embodiment of the present invention.

FIG. 2 is a view showing a wing shape of a propeller manufactured according to the calculation method shown in FIG. 1. FIG.

3 is a view showing a wing shape of the propeller for fishing vessels according to the prior art.

<Description of the symbols for the main parts of the drawings>

10: shaft 12: wing

12a: full extension extension 12b: full extension extension

100: propeller

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description of the present invention, if it is determined that detailed descriptions of related well-known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, terms to be used in the present invention are set according to the intention or custom of the designer or the user and described as follows. That is, "D" represents the rotation diameter of the propeller blades as shown in Figure 2, "R" is the end of one wing 12 from the center of the shaft 10 as shown in FIG. "L" is the wing width.

According to the embodiment of the present invention, the wing shape of the propeller for fishing vessels implemented as described above is as shown in FIG. 2. Referring to FIG. 2, the propeller 100 to be implemented in the present invention includes a shaft 10 receiving a driving force of an engine, and three wings 12 are usually attached to an outer circumferential surface of the shaft 10. have.

At this time, the edge of the front surface of the wing 12 is formed with a rounded convex extension part 12a at a predetermined angle, and the convex extension part 12b protruding prominently is also integrally formed at the edge of the convex body. .

On the other hand, the book / back extension portion (12a, 12b) is calculated by the following Table 1 and the formula, the numerical value shown in Table 1 is calculated by the inventor's effort, that is, the results of hundreds of experiments.

{Table 1} Wing shape dimension table of propeller

At wing width of 0.55 R 100 R 0.2 0.3 0.4 0.5 0.55 0.6 0.7 0.8 0.9 0.95 1.0 1max = 0.27D at 0.55R when the development area ratio of one wing is 0.1 Flock 27.96 33.45 38.76 42.2 41.5 41.0 51.33 53.0 72.7 56.80 17.5 Verdure 38.58 47.30 54.00 55.8 58.5 57.3 48.31 38.2 23.0 13.00 Whole wing 66.54 80.75 92.76 98.0 100 98.3 96.64 91.2 95.7 69.85

Hereinafter, the present invention will be described in detail based on the preferred embodiments of the present invention, but the present invention is not limited to the embodiments.

{Example 1}

The method of calculating the wing shape of the propeller for fishing vessels based on Table 1 mentioned above is as follows.

1. The conditions of the test ship are:

Test Ship Name: 4.99ton FRP Fishing Boat

Top E / G specifications: 238ps / 2000rpm, 6-cylinder water-cooled 4Cycle Diesel

Adoption drive specifications: 840D × 700P

2. The blade width at 0.55R is calculated (actually based on sea running test);

/ E / G Specifications: 238ps / 2000rpm

Propeller speed: 938rpm

HP DHP (Propulsion horsepower) = 238 × 0.95 = 226 ps (Sea Margine)

THP (Thrust Horsepower) = 226 × 0.685 = 155 ps (Thrust Horepower)

㉲ Vp (propulsion speed) = 18KT

㉳ ＝ 7.9 (N: rotation speed, D: rotation diameter)

㉴ T (Thrust) = THP / Vp × 146 = 155/18 × 146 = 1257Kg (Thrust)

㉵ T / A _E = 5710 (Thrust / Development area) --- Refer to ND / 100 to T / A _E table

_E A _E = ＝ = 0.22 (A _E : development area ratio)

_R ∴A _R = ＝ = 0.4 (development area ratio)

전개 The area of expansion of one wing = 0.4 / 3 = 0.133

× D × x = 303 ----- The maximum wing width is 303mm at 0.55R of the propeller (application) used for the actual test ship. ∴x = 0.3607

Next, L is calculated based on the deployment area ratio of one wing;

L = (0.3607 x 0.1) / 0.133 = 0.27

Therefore, when the blade area ratio of one wing is 0.1, the wing width L at 0.55R is 0.27D.

Hereinafter, the blade width L value is calculated by adding "D = 840" to the above-described formula (L = 0.27D), and then the numerical value is calculated to fit the ratio of the first and second ratios of Table 1, and then FIG. What is necessary is just to form a wing width as shown in FIG.

On the other hand, by calculating the wing width, preferably the wing shape in the same manner as in Table 1 and Example 1 described above will achieve the increased effect as shown in Table 2. Table 2 is a value comparing the performance of the ship with a conventional AU-type propeller and the ship with a propeller manufactured according to the present invention.

{Table 2}

Test Items Exam conditions Date Remarks Original AU type Application Engine exhaust temperature Factory shipment condition (238 ℃) 245 240 5 ℃ lower Engine speed Rated Rotation 238ps / 2000rpm 2000 2100 Load Reduction Meaning Ship speed (KT) Collinear 16 18 12.5% increase

As described above, the present invention changed the position of the maximum wing width from the conventional 0.66R to 0.55R to implement the shape of the wing, thereby improving the ship speed by more than 10%, and also lowered the engine load, fuel There is an advantage to reduce the engine and improve the engine durability.

Claims (7)

In the propeller for fishing vessels having a shaft (10) receiving power from the engine, and wings (12) attached to the outer peripheral surface of the sharp (10) and rotated, The wing 12 is a wing shape of the propeller for fishing vessels, characterized in that the front portion is formed protruding from the upper portion, the front portion is formed along the rim surface based on the center line. The method of claim 1, Wing shape of the propeller for fishing vessels, characterized in that the front surface extending portion (12a) and the rear surface extension portion (12a) protruding outward from the center line on the edge surface of the wing (12). In a fishing vessel propeller having a shaft 10 receiving power from an engine and wings 12 attached to an outer circumferential surface of the shaft 10 to rotate, a shape of the blade 12 is calculated. In the method; When the length from the center of the shaft 10 to one end of the blade 12 is denoted by R, and the R is divided into ten; Wing shape calculation method of the propeller for fishing vessels, characterized in that the maximum wing width is formed at R = 0.55. The method of claim 3, Calculate L (wing width) = 0.27D (rotation diameter) when the spread area ratio of the blade 12 is 0.1, and then, when L = 0.55, the L value is 0.1 ≤ L ≤ 0.6 based on 100%. When the blade width ratio is gradually increased, and when 0.6 <L ≤ 1.0, the wing shape calculation method of the propeller for fishing vessels, characterized in that the blade shape is calculated so as to become smaller. The method of claim 4, wherein L (wing width) = 0.27 D (rotation diameter) is calculated when the deployment area ratio of the blade 12 is 0.1, and the L value based on 100% when R = 0.55. The blade shape is calculated so that the width ratio of the green leaf is larger than the width ratio of the green leaf until 0.1 ≤ L ≤ 0.6 and the width ratio of the green leaf is larger than the width ratio of the green leaf. Wing shape calculation method. The method of claim 5, wherein the calculation of the blade shape is calculated using the blade shape table of the propeller shown in Table 1. The wing shape of the propeller for fishing vessels manufactured by the method of any one of Claims 3-6.