KR20200059846A - Rudder including duct having coanda effect - Google Patents

Abstract

According to the present invention, a rudder with a duct having a Coanda effect includes: a rudder main body in which an inlet is provided on an upper portion; a ring-shaped duct positioned on a lower portion of the inlet in the rudder main body and installed through the rudder main body; and a pressurizing pump installed on the upper portion of the rudder main body and transferring water sucked into the inlet to the ring-shaped duct, wherein the ring-shaped duct is provided with a ring-shaped outlet connected to the inlet through the inside of the rudder main body and discharging the water pressurized by the pressuring pump to the back of the rudder. In the present invention, seawater is sucked in front of the rudder so that the seawater flows out to an inner diameter of the duct. Therefore, the flow of the seawater is quickly formed so that straight moving and turning performance can be improved.

Description

A rudder with a duct with the Coanda effect {RUDDER INCLUDING DUCT HAVING COANDA EFFECT}

The present invention relates to a rudder of a ship, and relates to a rudder equipped with a duct having a Coanda effect that improves adjustment performance and obtains additional thrust.

The ship's rudder is installed behind the propeller at the stern. These rudders are rudders to determine the course of the ship. The rudder is arranged in a streamlined shape and is placed upright in the bottom part of the stern, and is connected to a rotation shaft receiving power for determining a direction, and is rotated left and right in connection with the operation of the rudder.

A propeller (propeller, etc.) to propel the ship is installed behind the hull, and in that section, the flow velocity is slowed by the effect of the hull. The propeller, which is rotated by receiving power from the engine, sucks the flow in front and accelerates the flow to the rear of the hull and releases it.

The rotational component of the rear discharge flow is inevitably affected by the rotation of the propeller. The other rig for the vessel is installed in the wake of the propeller, which is disturbed by the propeller and at the same time divides the disturbed flow by the propeller into a vertical plane and prevents mixing, thereby providing the effect of rectifying the flow.

As such, the hull, propeller, and other devices have a close relationship to each other. Therefore, in order to improve the propulsion performance of the ship, it is necessary not only to design the hull, propeller, and other devices to operate in the best conditions, but also to find conditions in which their interaction is advantageous.

In the case of a large ship, it was developed as a Becker-type rudder device that obtains high lift by mechanically interlocking the main wing and the auxiliary wing to secure lift in other devices requiring large lift. Another device using the Coanda phenomenon, which generates high lift by jetting a water jet through a crevice of a bar, has recently been devised.

The all-operated rudder or Becker-type rudder has a complicated structure, requires precise machining, and has been supplied exclusively by Becker as a patented technology, so it has been supplied at a high price and uses the Coanda phenomenon. Other devices have not yet reached full practical use due to unresolved technical problems such as inhalation and ejection of fluid.

The present invention is to solve the problem of the existing ship rudder, by inhaling the sea water in front of the rudder to flow the sea water through the inner diameter of the duct to quickly create a flow of sea water, a duct having a Coanda effect to improve the straight performance and turning ability It is to provide the provided rudder.

A rudder equipped with a duct having a Coanda effect according to the present invention for solving the above problems includes a rudder body having an inlet provided thereon; An annular duct positioned under the inlet from the rudder body and installed while passing through the rudder body; And it is installed on the upper portion of the rudder body, and includes a pressure pump that sends water sucked through the inlet to the annular duct, the annular duct is connected to the inlet through the interior of the rudder body, by the pressurized pump An annular outlet port is provided to discharge pressurized water to the rear portion of the rudder.

The annular duct may gradually decrease in diameter from the front portion to the rear portion of the rudder body.

The annular duct may have a streamlined shape from the front portion to the rear portion.

A grid-structured seawater filter may be installed at the inlet side of the rudder body.

The rudder body may be provided with a connection duct of the shape 'a' connecting the inlet and the annular duct.

The upper and lower portions of the annular duct are installed through the upper and lower regions of the central side wall of the rudder body, and the center line of the annular duct may be disposed corresponding to the longitudinal center line from the front portion to the rear portion of the rudder body. have.

The annular duct has a circular shape in which the front end portion is rounded, and the outer wall body tapered to have a small diameter from the front end portion to the rear end portion; And an inner wall connected to the rear end of the outer wall, the inner wall formed radially inward than the front end of the outer wall, wherein the outer wall is streamlined from the front end to the rear end, and the inner wall is from the rear end to the front. A streamlined bent portion having a tapered shape and bent inwardly at the front end of the outer wall is provided, and the outlet of the annular outlet may be provided as a gap between the front end of the outer wall and the streamlined bend.

The present invention according to the above-described solution means, a rudder equipped with a duct having a Coanda effect to improve the straight performance and turning ability by rapidly creating the flow of seawater by sucking the seawater from the rudder and flowing the seawater through the inner diameter of the duct. Can provide.

1 is a three-dimensional view of a rudder equipped with a duct having a Coanda effect according to an embodiment of the present invention,
Figure 2 is a front view of Figure 1,
Figure 3 is a side view of Figure 1,
4 is a plan view of FIG. 1,
Figure 5 is a longitudinal sectional view of the annular duct along the rudder body in Figure 4,
6 is an enlarged view of the circular area of FIG. 5.

The present invention is made to increase the turning capability of the ship by using the accelerated water as a duct having a Coanda effect as well as the thrust of the rudder, and to obtain additional thrust when going straight, and has a feature that a duct is attached to the rudder.

In addition, the present invention is provided with a motor for driving the impeller and it through a grid-shaped intake port on the top of the rudder, and a pipe for inlet and accelerated water introduced into the duct by the impeller is installed. The duct is empty so that water can flow, and a gap is formed to allow water to escape toward the inner diameter of the duct.

In the present invention, the water flowing into the upper part of the rudder is accelerated through the impeller to the inside of the duct, and the water discharged through the gap inside the duct proceeds to the back of the duct or the back of the rudder due to the Coanda effect, thereby turning. It can improve ability and straight performance.

Hereinafter, various embodiments of the present invention will be described by specific embodiments illustrated in the accompanying drawings. Differences in the embodiments should be understood as not mutually exclusive, without departing from the spirit and scope of the present invention, specific shapes, structures, and properties described in connection with one embodiment may be implemented in other embodiments .

1 is a three-dimensional view of a rudder equipped with a duct having a Coanda effect according to an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a side view of FIG. 1, and FIG. 4 is a view of FIG. 5 is a longitudinal cross-sectional view of the annular duct along the rudder body in FIG. 4.

1 to 5, the rudder equipped with a duct having a Coanda effect according to an embodiment of the present invention, the inlet 101 is provided on the rudder body 100, the rudder body 100, the inlet Located in the lower part of (101), the annular duct 110 installed while passing through the rudder body 100, and installed on the upper part of the rudder body 100 and sending water sucked through the inlet 101 to the annular duct 110 It includes a pressure pump 120.

The rudder body 100 is a rudder provided on the bottom surface of the stern of the hull, and has a streamlined longitudinal cross-section capable of changing the propulsion direction of the propeller.

The annular duct 110 is connected to the inlet 101 through the interior of the rudder body 100, and the annular outlet 111 that discharges water pressurized by the pressure pump 120 to the rear portion of the rudder body 100 Is prepared. In this case, the pressure pump 120 may include an impeller and a motor for driving the impeller.

The annular duct 110 is an annular thin duct structure having a streamlined cross section along the circumferential direction, and is installed on the rudder body 100 to cover both surface portions of the rudder body 100 while having an aspect along the circumferential direction. The annular duct 110 is a tapered aspect that gradually decreases in diameter from the front portion to the rear portion of the rudder body 100.

When the rudder body 100 proceeds in the water, the flow generated from both sides of the rudder body 100 passes through the inside of the annular duct 110. Since the annular duct 110 has a large front portion and gradually decreases from a rear portion to a rear portion, it is a shape capable of increasing the flow rate from the front portion to the rear portion, and the streamlines are concentrated on both surfaces of the rudder body 100 partially enclosed.

The annular duct 110 reduces the turbulence of fluid in the rudder body 100 and forms a long flow field from the front portion to the rear portion of the rudder body 100 so that the rudder body 100 serves as a rudder with little fluid loss. Make.

The annular duct 110 may have a streamlined shape from the front portion to the rear portion. The annular duct 110 is formed in a streamlined shape, such as the rudder body 100, and the resistance to fluid flow is reduced.

The upper and lower portions of the annular duct 110 are installed through the upper and lower regions of the central sidewall of the rudder body 100, and the center line of the annular duct 110 is from the front portion to the rear portion of the rudder body 100. It may be arranged corresponding to the center line of the longitudinal section.

As described above, as the annular duct 110 is installed in the rudder body 100, a flow field with less fluid loss to the rudder body 100 is formed by the annular duct 110 at both centers of the surface of the rudder body 100.

6 is an enlarged view of the circular area of FIG. 5.

5 and 6, the annular duct 110 as described above has a circular circular shape at the front end, and is connected to the rear end of the outer wall 115 and the outer wall 115 tapered to decrease the diameter from the front end to the rear end. And an inner wall 116 formed radially inward than the front end of the outer wall 115.

The outer wall 115 has a streamlined shape from the front end to the rear end, and the inner wall 116 has a tapered shape from the rear end to the front and has a streamlined refraction 117 that is inclined inwardly at the front end of the outer wall 115. Is provided, the annular outlet 111 may be provided as a gap between the front end of the outer wall 115 and the streamline refraction 117.

Fluid, such as sea water, is sucked by the pressurized pump 120 and flows into the inlet 101 of the rudder body 100, passes through the interior of the rudder body 100, and the front end portion of the outer wall 115 and the wired refracting portion ( 117) is injected into the annular outlet 111 between.

As such, the fluid is accelerated by being injected into the annular outlet 111, and is moved faster than the fluid of the outer wall 115 along the streamlined bend 117 and the downstream inner wall 116 of the annular duct 110. On the inner side of the annular duct 110, a flow field having a faster flow rate than that of the outer side is formed, and an effect of introducing more fluid from the front side to the inner side of the annular duct 110 is generated.

Accordingly, as the accelerated flow is generated inside the annular duct 110, a denser flow field is formed toward the surface of the rudder body 100, and fluid loss from the front portion to the rear portion of the rudder body 100 is lower than before. Since the fluid flow with high propulsion is reduced while being reduced, the linear performance and turning ability of the hull by the rudder body 100 is improved.

Meanwhile, referring to FIGS. 1 to 5, a grid structure seawater filter 125 may be installed at the inlet 101 side of the rudder body 100. The seawater filter 125 blocks the inflow of unnecessary objects such as seaweeds and garbage toward the inlet 101 side.

The rudder body 100 may be provided with an 'a' shaped connecting duct 130 connecting the inlet 101 and the annular duct 110.

The connecting duct 130 is to connect the internal space of the pressurized pump 120 and the annular duct 110 from the inside of the rudder body 100 and is arranged in a cross-sectional shape of the rudder body 100 and flows into the inlet 101 By being able to stably guide the fluid pressurized by the pressurized pump 120 to the annular duct 110.

100: rudder body 101: inlet
110: annular duct 111: outlet
115: outer wall 116: inner wall
117: wired bend 120: pressurized pump
125: seawater filter 130: connecting duct

Claims (7)

A rudder body having an inlet port at the top;
An annular duct positioned below the inlet port in the rudder body and installed while passing through the rudder body; And
It is installed on the upper portion of the rudder body, and includes a pressure pump that sends water sucked through the inlet to the annular duct,
The annular duct is connected to the inlet through the inside of the rudder body, and provided with an annular outlet for discharging water pressurized by the pressurized pump to the rear portion of the rudder, a rudder having a Coanda effect duct. According to claim 1,
The annular duct is a rudder equipped with a duct having a Coanda effect, the diameter of which gradually decreases from the front portion to the rear portion of the rudder body. According to claim 2,
The annular duct has a streamlined shape from the front portion to the rear portion, and a rudder equipped with a duct having a Coanda effect. The method of claim 3,
In the rudder body, a grid-structured seawater filter is installed on the inlet side, and a rudder equipped with a duct having a Coanda effect. The method of claim 3,
The rudder body is equipped with a duct having a Coanda effect, in which a connection duct of 'a' shape connecting the inlet and the annular duct is installed. The method according to any one of claims 1 to 5,
The upper and lower portions of the annular duct are installed through the upper and lower regions of the central side wall of the rudder body,
A rudder with a duct having a Coanda effect, wherein the center line of the annular duct is disposed corresponding to the center line of the longitudinal section from the front part to the rear part of the rudder body. According to claim 1,
The annular duct,
An outer wall having a rounded circular shape at the front end and tapered from the front end to the rear end; And
It is connected to the rear end of the outer wall, and includes an inner wall formed radially inward than the front end of the outer wall,
The outer wall has a streamline shape from the front end to the rear end, and the inner wall has a tapered shape from the rear end to the front, and a wired refracting part inclined toward the inside of the front end of the outer wall is provided.
The annular outlet is a rudder equipped with a duct having a Coanda effect, which is provided as a gap between the front end portion of the outer wall and the wired refraction portion.

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