KR20100037520A - Vessel with side thruster - Google Patents

Abstract

PURPOSE: A vessel with a side thruster is provided to improve the fuel consumption rate by reducing the resistance due to a tunnel during propulsion. CONSTITUTION: A vessel with a side thruster comprises a lid part(17), a spindle part(19A), and a driving part. The lid part opens and closes the entrance of a tunnel(9). The spindle part is fixed to the lid part and supported to freely rotate. The driving part closes or opens the tunnel by raising or lowering the lid part through the rotation of the spindle part. When the tunnel is closed, the lid part has a front surface facing the outside of the tunnel and a rear surface facing the inside of the tunnel. An axial line(L2) of the spindle part is extended perpendicular to the axial line of the tunnel and deviated from the tunnel axial line. When the tunnel is opened, the front surface of the lid part gets close to the tunnel axial line.

Description

Hull with side thruster {Vessel with side thruster}

The present invention relates to a hull having a side thruster.

Background Art A hull provided with a side thruster has been known in the art for facilitating hulling and berthing of the hull. The side thruster includes a tunnel penetrating across the bottom and a screw disposed in the tunnel. Usually, the side thruster is provided in each of the bow side and the stern side, and becomes a propulsion force when a hull moves sideways. According to the hull with side thrusters, tugboats and the like are unnecessary at the time of the eyepiece, and the operability is improved.

The side thruster tunnel is in the water under the draft of the hull, and the opening (entrance) of the tunnel formed on the side of the hull becomes the resistance of the hull progression, affecting the hull speed and hull operation and lowering the fuel consumption rate. . Thus, for example, a technique has been developed in which a cover structure for opening and closing the entrance and exit of a tunnel is provided, and the resistance is reduced by closing the tunnel during normal hull travel (see Japanese Patent Laid-Open No. 59-45198). This kind of cover structure has a structure similar to a butterfly valve, and has a circular plate corresponding to the shape of the inner circumferential surface of the tunnel and a shaft portion for rotating the circular plate. The axis line (rotation axis line) of the shaft part is arrange | positioned so that it may cross | intersect the center line (tunnel axis line) of a tunnel, and if a shaft part is rotated, a circular plate will also rotate. When the circular plate stands up, it blocks the tunnel and the tunnel is closed. On the other hand, when the circular plate falls down and is pressed horizontally, the tunnel is fully opened. Side thrusters are operated with the tunnel fully open.

The circular plate of the cover structure has a surface that forms an outer side and a rear surface that faces inward when the tunnel is closed. The axis of rotation of the cover structure intersects the tunnel axis, but is substantially separated from the surface of the circle and the axis of rotation, so that when the plate is overturned to open the tunnel, the surface of the plate deviates below the tunnel axis. For this reason, it is necessary to make a clearance in the tunnel to allow the above deviation. This clearance gap becomes a gap that can not be closed even when the circular plate stands up, and becomes a resistance when the hull is advanced. However, in the conventional hull with side thruster, it is common to make the rotation axis intersect with the tunnel axis in the cover part which closes the tunnel, and in particular, it is not considered about generation | occurrence | production of resistance resulting from the above-mentioned space | interval, It was not sufficient in that the fuel consumption rate was improved by reducing the resistance.

An object of the present invention is to provide a side thruster with a side thruster capable of reducing the resistance at the time of advancing by the side thrust tunnel and improving the fuel consumption rate.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention is a hull with side thruster which has a cylindrical tunnel penetrating a ship bottom, and the screw arrange | positioned in the tunnel, WHEREIN: The cover part which opens and closes the entrance and exit of the said tunnel, and the said cover part And a shaft portion fixed and freely supported on the bottom of the ship, and a drive portion for closing the tunnel by standing the lid portion by the rotation of the shaft portion, and opening the tunnel by overturning the lid portion. When the tunnel is closed, it has a surface facing the outside of the tunnel and a back surface facing the inside of the tunnel, wherein the axis of rotation of the shaft portion extends in a direction orthogonal to the tunnel axis of the tunnel and extends to the tunnel axis. And the surface of the cover part when the tunnel is opened is formed so that the rotation axis intersects the tunnel axis. Characterized in that close to the Yiwu, tunnel axis compared.

In the present invention, the drive unit stands up to close the tunnel by standing the cover by rotating the shaft, and the cover is opened to open the tunnel. Since the lid has a substantial thickness, there is a predetermined distance between the axis of rotation of the shaft and the surface of the lid. For this reason, when the shaft portion is dropped in order to open the tunnel, the surface of the shaft portion comes off, for example, below the rotation axis. When the tunnel is closed, the widest part of the surface of the cover part exists on the tunnel axis, but when the cover part is opened and the tunnel is opened, the widest part comes below the tunnel axis. Therefore, in order to avoid interference with the surface of the cover part at the time of opening a tunnel, the inner peripheral surface near the entrance and exit of a tunnel needs to form a clearance gap. In a conventional hull, it was common to intersect the axis of rotation of the shaft portion and the tunnel axis. However, in the present invention, since the axis of rotation of the shaft portion extends in a direction perpendicular to the tunnel axis and also deviates from the tunnel axis, a conventional general hull, that is, the axis of rotation of the shaft portion which opens and closes the cover, when the tunnel is opened. Compared to the hull intersecting the tunnel axis, the surface of the cover portion is closer to the tunnel axis, and the size of the clearance gap can be made smaller than that of the conventional hull. Even if the tunnel is closed by standing the cover, the clearance can not be covered by the cover, so the clearance is a resistance in normal hull travel. Therefore, if the clearance interval can be made small, the gap generated between the inner circumferential surface of the tunnel and the cover portion at the time of closing the tunnel is reduced, so that the resistance during hull travel can be reduced, and the fuel consumption rate can be improved.

Moreover, the width | variety of the part which installed the said tunnel of the said bottom is narrower than the upper side, The said cover part stands up obliquely along the outer peripheral surface of the said bottom around the entrance of the said tunnel, and closes a tunnel, The said shaft part The axis of rotation of the upper part is deviated upward with respect to the said tunnel axis, and the part of the surface of the said cover part in which the width | variety of the width | variety in the said direction of rotation axis is wide is strong, when the said rotation axis intersects the said tunnel axis when a tunnel is opened. In comparison, it is preferable to be close to the tunnel axis. Since the cover part closes the tunnel by standing obliquely along the outer circumferential surface of the bottom around the entrance and exit of the tunnel, the resistance at the time of closing the entrance and exit of the tunnel and proceeding to the hull can be reduced. In addition, the axis of rotation of the shaft portion is shifted upward with respect to the tunnel axis, and the portion of the cover portion having the widest width in the axial direction of the shaft portion is larger than the case where the axis of the shaft portion intersects the tunnel axis when the tunnel is opened. Close to the tunnel axis. It is necessary to form the clearance of the tunnel to the widest part. Since the widest part is closer to the tunnel axis, the clearance can be reduced more securely than the case where the axis of rotation of the shaft crosses the tunnel axis, and the resistance at the time of the hull can be reduced, thereby improving the fuel consumption rate. You can do it.

Moreover, it is preferable that the said cover part is a wing shape whose surface and back surface are convex curved surface. When the cover is opened and the tunnel is opened, and the screw is driven in the state, the resistance of the fluid passing through the tunnel becomes small, and the fuel consumption rate can be improved.

Moreover, it is preferable that there exists a pair of shaft parts fixed to the said cover part, and the said pair of shaft parts are arrange | positioned independently at both sides of the said cover part, respectively. Since the pair of shaft portions are provided independently of each other, repair and maintenance accompanied with damage to one shaft portion are facilitated.

In addition, it is preferable to open the cover part using the hydraulic pressure. By using hydraulic pressure, a small and large output can be obtained, and the friction loss is small, so that the efficiency is good.

In addition, the driving portion is projected from each of the pair of shaft portions, and a pair of arm portions extending in a direction crossing the rotation axis of the shaft portion, and connected to each of the pair of arm portions to rotate the shaft portion by tilting the arm portion. It is preferable to include a pair of cylinders and a hydraulic pump for supplying hydraulic pressure to both of the pair of cylinders. Since the cylinder part acts to incline the arm part and the shaft part rotates to open and close the cover part by the inclined motion of the arm part, the cover part can be opened and closed efficiently with a small force.

It is preferable that the drive section further includes a detection section provided in the cylinder section and detecting at least one of an open position and a closed position of the lid section to stop the operation of the hydraulic pump. When the detection section detects the open position of the lid portion, the shaft portion that moves from the closed position to the open position can be reliably stopped at the open position. In addition, when the detector detects the closed position of the shaft portion, the lid portion which moves from the open position to the closed position can be reliably stopped at the closed position.

In addition, it is preferable that the cover part further comprises a locking part for holding the cover part at a predetermined position by maintaining hydraulic pressure supplied to the cylinder part when closing the tunnel. Since the lid portion can be held at a predetermined position (for example, a closed position or an open position), the resistance generated at the entrance and exit of the tunnel can be stably reduced by eliminating the influence of the shaking of the lid portion.

In addition, when the cover portion closes the entrance and exit of the tunnel, it is preferable that the cover portion further includes an overload prevention portion for releasing the holding by the locking portion. In the case where the cover part is overloaded by external force, holding of the cover part by the locking part is released, so that damage to the cover part and the driving part due to the overload is avoided.

The side bottom is preferably provided with a tunnel of the side thruster in both the front part of the bow side and the rear part of the stern side, and the cover part is preferably opened and closed at least the entrance and exit of the front part tunnel. Since the fuel consumption rate is easily reduced by the resistance of the side thruster tunnel on the bow side, the fuel consumption rate can be reduced efficiently by opening and closing the entrance and exit of at least the front tunnel by the cover part.

This invention has the effect which can reduce the resistance at the time of ship hull by a tunnel of a side thruster, and can improve fuel consumption rate.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in order to describe in detail enough to enable those skilled in the art to easily carry out the present invention. . Other objects, features, and operational advantages, including the purpose, operation, and effect of the present invention will become more apparent from the description of the preferred embodiments.

Fig. 1 is a view schematically showing a hull with side thruster (hereinafter referred to as a 'hull') 1, wherein (a) is a side view and (b) is a bottom view.

The hull 1 is provided with side thrusters 3 and 5 in both directions at the front of the bow 1a side and at the rear of the stern 1b. The side thruster on the side of the player 1a is called a bow thruster 3, and the side thruster on the stern 1b side is called a stern thruster 5. In modern large passenger ships and the like, three bow thrusters and three stunsters are provided. However, in the embodiment of the present invention, a hull (1) ) Is illustrated. If the Bauster star 3 and the stunster star 5 are provided, the ship can be easily hulled even without the help of a tugboat, even when docked on the inner wall, which is convenient and economical.

FIG. 2 is an enlarged cross-sectional view of the II-II line of FIG. 1 showing the Bauster star 3, FIG. 3 is an enlarged view of the cross section of the lid shown in FIG. 2, and FIG. 5 is a plan view of the lid. Hereinafter, the side thruster will be described with reference to FIGS. 2 to 5. However, in the present embodiment, since the thruster 3 and the stunster 5 have substantially the same configuration, It demonstrates centering on 3) and description of the stunster 5 is abbreviate | omitted.

The bottom 7 of the hull 1 is designed in consideration of various factors, such as underwater resistance and hull construction at the time of draft. The bottom 7 of the embodiment of the present invention is substantially streamlined (see Fig. 1 (b)) in order to reduce the fluid resistance at the time of proceeding the hull. The ship bottom 7 is provided with the tunnel 9 of the Bauster star 3. The tunnel 9 has a cylindrical shape having a circular cross section and penetrates the bottom 7 along the left and right directions perpendicular to the front and rear directions. The screw 11 for sucking and discharging fluid, such as seawater, is provided in the tunnel 9 in the substantially center of the said tunnel 9 in the left-right direction. The screw 11 is rotated by the drive of the drive motor 13, and the drive motor 13 is disposed in the chamber 15 provided in the ship bottom 7.

The ship bottom 7 has the width | variety B1 of the lower side narrower than the width | variety B2 of the upper side in the part in which the tunnel 9 was provided (refer FIG. 2). Therefore, the outer circumferential surface 7a of the bottom 7 around the entrance 9a on the right and left of the tunnel 9 is a convex curved surface inclined obliquely with respect to the center line (tunnel axis) L1 of the tunnel 9. It is. The cover part 17 which opens and closes each entrance 9a is provided in the entrance 9a of the left and right of the tunnel 9, respectively. The cover 17 has a structure similar to a butterfly valve that is opened and closed by rotation of the shaft portions 19A and 19B, but the shape of the cover 17 viewed from a flat state is not a circle close to a garden shape, but rather an ellipse. It has an egg-shaped shape close to (see FIG. 5). The shape of the cover portion 17 corresponds to the shape generated when the tunnel 9 is cut out obliquely from the shape of the outer circumferential surface 7a of the bottom 7 around the entrance 9a of the tunnel 9. have.

The cover portion 17 has a surface 17a facing outward of the tunnel 9 and a back surface 17b facing inward of the tunnel 9 when closing the entrance and exit 9a of the tunnel 9. The lid 17 has a convex lens shape in which the front surface 17a and the rear surface 17b are convex curved surfaces. In addition, the lid 17 is capable of closing the entrance and exit 9a of the tunnel 9 by one plate member having a blade shape.

As shown in FIG. 4, a pair of independent shaft portions 19A and 19B are provided on both sides of the lid portion 17 (both sides in the front and rear directions of the hull 1). The shaft portions 19A and 19B are supported by the boss portion 21 fixed to the bottom 7 around the tunnel 9 by welding or the like. In the boss portion 21, a bearing portion (not shown) for rotatably supporting the shaft portions 19A and 19B and a seal (not shown) constituting the watertight mechanism are assembled. Since the pair of shaft portions 19A and 19B are independent on both sides of the lid portion 17, assembly and disassembly are easy, and the shaft portions 19A and 19B can be inserted into or removed from the boss portion 21. The external space required in the case is also reduced compared to the case in which the lid is freely supported by one shaft portion intersecting the lid.

Of the pair of shaft portions 19A and 19B, one shaft portion 19A is fixed to the lid portion 17 at the proximal end. The tip end of the shaft portion 19A protrudes from the boss portion 21, and the arm portion 23 protruding and extending in the direction orthogonal to the rotation axis L2 of the shaft portion 19A is fixed to the tip end thereof. The arm portion 23 is connected to the piston rod 25a of the hydraulic cylinder 25A via a pin. The arm portion 23 inclines around the shaft portion 19A by the reciprocating movement of the piston rod 25a, and the shaft portion 19A rotates in accordance with the inclination movement of the arm portion 23. Similarly, the other shaft portion 19B is rotatably supported by the boss portion 21 fixed to the ship bottom 7, and the arm portion 23 is connected to the piston rod 25a. The arm 23 is inclined by the reciprocating motion of the piston rod 25a of the hydraulic cylinder 25B, and the shaft 19B is rotated by the inclined motion of the arm 23. A stopper member (not shown) corresponding to the closed position of the lid portion 17 is provided at the end when the piston rod 25a is advanced, and the piston rod 25a moves forward by contacting the stopper member. This is regulated.

The pair of piston rods 25a connected to each of the shaft portions 19A and 19B reciprocate in synchronization with each other, and rotate while rotating both shaft portions 19A and 19B. As the shafts 19A and 19B rotate, the lid 17 moves in and out. The cover portion 17 closes and closes the entrance and exit 9a of the tunnel 9 in an upright state along the outer circumferential surface 7a of the bottom 7 around the entrance and exit 9a of the tunnel 9. In the horizontally laid down form, all the entrances and exits 9a of the tunnel 9 are opened.

The lid portion 17 is opened and closed by a driving device (drive portion) 24 using hydraulic pressure. 6 shows a hydraulic circuit constituting the drive device 24. As shown in FIG. 6, the drive device 24 is provided with hydraulic cylinders (cylinder parts) 25A, 25B for reciprocating the piston rod 25a. The hydraulic cylinders 25A and 25B are provided in pairs corresponding to the respective shaft portions 19A and 19B of the lid portion 17, and are arranged so as to sandwich the lid portion 17 therebetween.

The hydraulic circuit of the drive device 24 is provided with a first flow passage 51 and a second flow passage 52 communicating with the electromagnetic direction switching valve 41 from the oil tank 31. The first flow path 51 is a line for supplying hydraulic oil, and the second flow path 52 is a line for returning the hydraulic oil to the oil tank 31.

The hydraulic pump 27 is provided in the first flow path 51. The hydraulic pump 27 is operated by the start of the electric motor 29, sucks the hydraulic oil from the oil tank 31 and discharges it from the discharge port 27a. Further, the first flow path 51 is provided with a filter 33 for protecting the hydraulic pump 27 upstream of the hydraulic pump 27, that is, the oil tank 31. The first flow path 51 is provided with a non-return valve 35 and a stop valve 39 downstream of the hydraulic pump 27.

In addition, the first flow path 51 is provided with a bypass path 53 branched between the non-return valve 35 and the stop slab 39 to communicate with the second flow path 52. A relief valve 37 is provided at 53 to hold the inside of the hydraulic circuit at a constant pressure.

The electromagnetic direction switching valve 41 is switched to one of either the open position Po or the closed position Pc by being excited from the neutral position Pn, and returns to the neutral position Pn if it is an element. The open position Po is a position at which the hydraulic oil is supplied to protrude (advanced) the piston rod 25a to move the lid portion 17 in the open direction. The closing position Pc is a position at which hydraulic oil is supplied to pull the piston rod 25a (retract) to move the lid portion 17 in the closing direction. The neutral position Pn is a position at which supply of hydraulic oil to the hydraulic cylinder 25 is stopped. The electromagnetic direction switching valve 41 is electrically connected to the lid closed position detection switches 47A and 47B and the lid open position detection switches 49A and 49B. The electromagnetic direction switching valve 41 has an open position (Po), an intermediate position (Pn), based on a detection signal from the cover closed position detection switches 47A and 47B or the cover open position detection switches 49A and 49B. Or it is switched to the closed position Pc.

The third flow path 54 and the fourth flow path 55, through which the pair of hydraulic cylinders 25A and 25B communicate with each other, are connected to the electromagnetic direction switching valve 41. When the electromagnetic direction switching valve 41 is in the open position Po, the hydraulic oil supplied from the first flow passage 51 is supplied to the third flow passage 54, and the hydraulic oil returned from the fourth flow passage 55 is The oil tank 31 is returned to the oil tank 31 via the second oil passage 52. When the electromagnetic direction switching valve 41 is in the closed position Pc, the hydraulic oil supplied from the first flow passage 51 is supplied to the fourth flow passage 55, and the hydraulic oil returned from the third flow passage 54 is The oil tank 31 is returned to the oil tank 31 via the second oil passage 52. When the electromagnetic directional switching valve 41 is in the neutral position Pn, even if hydraulic oil is supplied from the first flow path 51, it is not supplied to the third flow path 54 and the fourth flow path 55. The oil tank 31 is returned to the oil tank 31 via the second oil passage 52.

The third flow passage 54 is branched, and each branch is connected to each of the pair of hydraulic cylinders 25A and 25B. Moreover, the 4th flow path 55 is branched, and each branch is connected to each of a pair of hydraulic cylinders 25A and 25B. Since the pair of hydraulic cylinders 25A and 25B have the same configuration, the connection between the third flow passage 54 and the fourth flow passage 55 and the hydraulic cylinders 25A and 25B will be described using one hydraulic cylinder 25A as an example. do. 25 A of hydraulic cylinders are double acting cylinders, and are provided so that two ports 25a and 25d which supply hydraulic fluid may interpose piston 25b. The third flow passage 54 is connected to the port 25c on the side of advancing the piston rod 25a, and the fourth flow passage 55 is connected to the port 25d on the side of the back of the piston rod 25a. . When the hydraulic oil is supplied from the third oil passage 54, the hydraulic oil is discharged from the fourth oil passage 55, and when the hydraulic oil is supplied from the fourth oil passage 55, the hydraulic oil is discharged from the third oil passage 54.

Locking circuits (locking portions) 43 are provided in the third flow passage 54 and the fourth flow passage 55. The locking circuit 43 includes pilot check valves 43a and 43b provided in each of the third flow passage 54 and the fourth flow passage 55. The pilot check valve 43a provided in the third flow path 54 allows the flow of the hydraulic oil from the electromagnetic direction switching valve 41 side and regulates the flow of the hydraulic oil from the hydraulic cylinder 25 side. In addition, the pilot check valve 43b provided in the fourth flow path 55 allows the flow of the hydraulic oil from the electromagnetic direction switching valve 41 side and regulates the flow of the hydraulic oil from the hydraulic cylinder 25 side. The locking circuit 43 flows hydraulic oil from the hydraulic cylinder 25 when the cover portion 17 reaches the open position or the closed position and the electromagnetic direction switching valve 41 is switched to the neutral position Pn. The piston rod 25a is held at a predetermined position, and as a result, the movement of the lid portion 17 is stopped to hold the lid portion 17 at the predetermined position.

In addition, the pilot check valve 43a installed in the third flow path 54 has a hydraulic check valve 43b installed in the fourth flow path 55 when hydraulic oil is supplied from the electromagnetic direction switching valve 41 side. Open As a result, the working oil from the hydraulic cylinder 25 side is discharged toward the electromagnetic direction switching valve 41 side in the fourth flow path 55. As a result, when supplying hydraulic oil from the 3rd flow path 54, the hydraulic fluid from the 4th flow path 55 is discharged smoothly. In addition, the pilot check valve 43b installed in the fourth flow path 55 has a hydraulic check valve 43b installed in the third flow path 54 when hydraulic oil is supplied from the electromagnetic direction switching valve 41 side. Open As a result, the working oil from the hydraulic cylinder 25 side is discharged toward the electromagnetic direction switching valve 41 side in the third flow path 54. As a result, when supplying hydraulic oil from the 4th flow path 55, the hydraulic oil from the 3rd flow path 54 is discharged smoothly.

The third flow passage 54 and the fourth flow passage 55 are provided with an overload prevention circuit (overload preventing portion) 45 on the hydraulic cylinder 25 side rather than the locking circuit 43. The overload prevention circuit 45 is provided with a return flow path 56 connected to the second flow path 52. A safety valve (relief valve) 57 is provided in the return flow passage 56. The first bypass passage 56a and the fourth passage 55 connected to the third passage 54 on the upstream side, that is, closer to the locking circuit 43, than the safety valve 57 in the return passage 56. The 2nd bypass path 56b connected to the is provided. In addition, a third bypass path 56c connected to the third flow path 54 and a fourth bypass path connected to the fourth flow path 55 are located downstream from the safety valve 57 in the return flow path 56. 56d is provided. The first bypass passage 56a is provided with a non-return valve 56e for regulating the flow from the third flow passage 54 to the return flow passage 56, and the fourth bypass passage 56b has a fourth The backflow prevention valve 56f which regulates the flow from the flow path 55 to the return flow path 56 is provided. In addition, a non-return valve 56g for guiding the high pressure oil of the third flow path 54 to the safety valve 57 is installed in the third bypass path 56c, and the fourth bypass path 56d is provided with a fourth check path 56c. The non-return valve 56h which guides the high pressure oil of the flow path 55 to the safety valve 57 is provided. The non-return valve 56g prevents the flow from the fourth flow path 55 to the third flow path 54. In addition, the non-return valve 56h prevents the flow from the third flow passage 54 to the fourth flow passage 55.

The overload protection circuit 45 is subjected to an external overload such as watering on the cover portion 17 closing the tunnel 9, and as a result, the piston rod 25a, the fourth flow path 55 and the non-return valve When hydraulic pressure of a predetermined pressure or more is applied to the safety valve 57 via the 56h, the safety valve 57 is opened, and the hydraulic oil is led to the fourth flow path 54 via the non-return valve 56e. At the same time, the shortage of the flow rate caused by the effective area difference between the pistons 25b of the hydraulic cylinders 25A and 25B is supplied from the oil tank 31 via the second flow path 52. As a result, the lid 17 moves in the opening direction, so that excessive load is not applied to the lid 17 and the drive device 24, thereby preventing damage. The safety valve 57 is set to a higher pressure than the relief valve 6.

In addition, in the driving device 24, a pair of lid closing positions for detecting a state in which the piston rod 25a is retracted and pulled, that is, a state in which the lid 17 closes the entrance 9a of the tunnel 9 is detected. A pair of cover opening positions for detecting a state in which the switches 47A and 47B and the piston rod 25a move forward and protrude, that is, a state in which the cover 17 opens all the entrances and exits 9a of the tunnel 9. Detection switches 49A and 49B are provided. The cover closing position detecting switches 47A and 47B and the cover opening position detecting switches 49A and 49B are provided in each of the pair of hydraulic cylinders 25A and 25B, and the piston rods of the hydraulic cylinders 25A and 25B ( It is arrange | positioned at the position near the end of the reciprocating track of 25a). The cover closing position detecting switches 47A and 47B and the cover opening position detecting switches 49A and 49B are electrically connected to the electric motor 29 and the electromagnetic direction switching valve 41, and are capable of transmitting a detection signal. .

In the hull 1 of the embodiment of the present invention, the rotation axis L2 of the shaft portions 19A and 19B for opening and closing the lid portion 17 extends in a direction orthogonal to the tunnel axis L1, and extends to the tunnel axis L1. Deviating upwards. Hereinafter, the effect by which rotation axis L2 of shaft part 19A, 19B deviates with respect to tunnel axis L1 is demonstrated with reference to FIG. 3, FIG. 7, and FIG.

FIG. 7 illustrates a conventional side thruster, and is an enlarged cross-sectional view showing a cover portion. 8 is a view schematically showing the lid portion in order to compare the conventional side thruster with the side thruster of the embodiment of the present invention, (a) is a cross-sectional view of the lid portion of the embodiment of the present invention, and (b) Is a front view of the lid portion of the embodiment of the present invention, where (a) and (b) correspond to each other. 8C is a cross-sectional view of a conventional lid portion, (d) is a front view of a conventional lid portion, and (c) and (d) have a corresponding relationship.

As shown in Figs. 8 (c) and 8 (d), the rotation axis L3 of the shaft portion 119 intersects the tunnel axis L1 in the related art. Since the lid portion 117 has a substantial thickness, there is a predetermined distance between the rotational axis L3 of the shaft portion 119 and the surface 117a of the shaft portion 117. Therefore, the surface 117a of the cover part 117 will fall below the rotation axis L3 when the cover part 117 is felled in order to open the tunnel 109. As shown in FIG. In the state in which the cover part 117 is closing the tunnel 109, the widest part Pb of the surface 117a of the cover part 117 comes below the tunnel axis L1. Therefore, it is necessary to form a clearance gap Rb on the inner circumferential surface near the entrance and exit of the tunnel 109 so as to avoid interference with the surface 117a of the lid 117 when the tunnel 109 is opened. Even when the cover 9 is closed and the tunnel 9 is closed, the cover 117 cannot cover the gap which becomes the clearance gap Rb. Therefore, the clearance gap Rb has a resistance in normal hull travel. It becomes.

As shown in Figs. 8A and 8B, in the embodiment of the present invention, the axis of rotation L2 of the shaft portion 19A deviates upward with respect to the tunnel axis L1. Therefore, when the tunnel 9 is opened, the surface 17a of the lid portion 117, which is the widest portion Pa, is closer to the tunnel axis L1 than the conventional case, and the clearance gap Ra ) Can be made smaller than the conventional hull. When the clearance gap Ra is made small, the gap between the inner circumferential surface of the tunnel 9 and the cover 17 when the tunnel 9 is closed becomes small, so that the resistance at the time of hull travel is reduced, The fuel consumption rate can be improved.

Next, the operation method of the side thruster is demonstrated centering on the operation | movement procedure of the cover part 17 which opens and closes the tunnel 9 of the bow thruster 3. When normal hull progression is complete | finished and it docks in the quay of the destination, the operator who performs hull operation presses an open switch, and performs an opening operation. Then, the electric motor 29 is operated to operate the hydraulic pump 27. When the motor 29 reaches the rated rotation, the electromagnetic direction switching valve 41 is switched to the open position Po.

In this state, hydraulic oil through the third oil passage 54 is supplied to the hydraulic cylinders 25A and 25B, while hydraulic oil is discharged from the hydraulic cylinder 25 via the fourth oil passage 55. Then, the piston rod 25a advances, rotates the shaft portions 19A and 19B, falls over the lid portion 17, and starts to open the entrance and exit 9a of the tunnel 9. When the cover open position detection switches 49A and 49B detect the piston rod 25a, the electromagnetic direction switching valve 41 is deactivated to switch to the neutral position Pn, and the electric motor 29 is stopped so that the hydraulic pump ( 27) stops working. Here, the locking circuit 43 operates to prevent the back flow of the hydraulic oil from the hydraulic cylinders 25A and 25B, and to keep the piston rod 25a at a predetermined position. As a result, the lid 17 is held in an open position in which the entrance 9a of the tunnel 9 is fully opened.

When the tunnel 9 is opened, the drive motor 13 is started to rotate the screw 11 of the Bauster star 3. When the screw 11 arranged in the tunnel 9 rotates, the propulsion force in the transverse direction is generated with respect to the hull 1. As a result, the hull 1 can move in the transverse direction without the tugboat and can be docked.

Next, the operation procedure at the time of closing the entrance 9a of the tunnel 9 by the cover part 17 is demonstrated. The operator pushes the closing switch to close it. Then, the electric motor 29 is operated to operate the hydraulic pump 27. When the motor 29 reaches the rated rotation, the electromagnetic direction switching valve 41 is excited to switch from the neutral position Pn to the closed position Pc.

In this state, hydraulic oil through the fourth oil passage 55 is supplied to the hydraulic cylinders 25A and 25B, and hydraulic oil is discharged from the hydraulic cylinders 25A and 25B through the third oil passage 54. Then, the piston rod 25a is retracted to rotate the shaft portions 19A and 19B so that the lid portion 17 stands up to close the entrance and exit 9a of the tunnel 9. When the cover open position detecting switch 49A, 49B is released and the cover closing position detecting switch 47A, 47B detects the piston rod 25a, the electromagnetic direction switching valve 41 is demagnetized and switched to the neutral position Pn. In addition, the electric motor 29 is stopped and the operation of the hydraulic pump 27 is stopped. Here, the locking circuit 43 operates to prevent the back flow of the hydraulic oil from the hydraulic cylinder 25, and keeps the piston rod 25a at a predetermined position. As a result, the lid 17 is held in the closed position closing the entrance and exit 9a of the tunnel 9.

Next, a description will be given of the safety function when an external overload is applied to the cover portion 17 while the cover portion 17 is in the closed state and the entrance 9a of the tunnel 9 is in progress. When an external overload such as watering is applied to the cover portion 17 and the cover portion 17 receives a force in the direction of opening the entrance 9a of the tunnel 9, the piston rod 25a is excessively moved forward. Force is at work. Then, the hydraulic oil in the hydraulic cylinder 25 is subjected to excessive hydraulic pressure of more than a predetermined pressure to the overload protection circuit 45 via the fourth flow path (55).

In the overload prevention circuit 45, when excessive hydraulic pressure is applied via the fourth flow path 55 and the fourth bypass path 56d, the safety valve 57 is opened and discharged to the return flow path 56. On the other hand, the hydraulic fluid is supplied to the third flow path 54 via the first bypass path 56a of the overload protection circuit 45, and at the same time, the effective area difference of the piston 25b of the hydraulic cylinders 25A and 25B is applied. The flow rate deficiency which arises is supplied from the oil tank 31 through the 2nd flow path 52. As a result, the piston rod 25a moves forward and protrudes, and the lid 17 is opened to eliminate the overload condition.

When either of the cover closing detection switches 47A and 47B is in the non-detection state by the advancement of the piston rod 25a, the detection signal is notified to the electric motor 26 and the electromagnetic direction switching valve 41. Receiving a non-detection signal from the cover closing detection switches 47A and 47B, the motor 29 operates the hydraulic pump 27, and the electromagnetic direction switching valve 41 moves from the neutral position Pn to the closed position Pc. The cover portion 17 that has been switched and once opened operates again to close the entrance and exit 9a of the tunnel 9.

The effect by the hull 1 of the Example of this invention is demonstrated. When the tunnel 9 is closed by the cover 17, the widest part Pa of the surface 17a of the cover 17 (see Figs. 8 (a) and 8 (b)). Is present on the tunnel axis L1, but when the cover 17 is overturned, the widest part Pa comes to the lower side than the tunnel axis L1. In order to avoid interference with the widest portion Pa, it is necessary to form a clearance gap Ra on the inner circumferential surface in the vicinity of the entrance and exit 9a of the tunnel 9. In the hull 1, the rotational axis L2 of the shaft portions 19A and 19B extends in a direction orthogonal to the tunnel axis L1 and deviates from the tunnel axis L1, so that a conventional general hull (FIG. 7) 8 (c) and 8 (d), that is, the rotation part L3 of the shaft part 119 which opens and closes the cover part 17, as compared with the hull intersecting the tunnel axis L1. The surface 17a of the surface 17) is close to the tunnel axis L1, and the size of the clearance gap Ra can be made smaller than the size of the clearance gap Rb of the conventional hull. Even if the tunnel 9 is closed by standing the lid 17, the clearance gap Ra cannot be covered by the lid 17, so the clearance gap Ra becomes a resistance in normal hull travel. Throw it away. However, since the clearance gap Ra can be made small in the hull 1 compared with the conventional hull, when the tunnel 9 is closed, the space | interval which arises between the inner peripheral surface of the tunnel 9 and the cover part 17 will be made. It becomes small, the resistance at the time of hull travel is reduced, and the fuel consumption rate can be improved. Particularly, in the hull 1, when the lid 17 is overturned, the widest part Pa becomes closer to the tunnel axis L1 than the conventional hull, so that the clearance gap Ra is surely reduced. It is possible to reduce the resistance at the time of the hull and to improve the fuel consumption rate.

Further, in the hull 1, the width of the portion where the tunnel 9 of the ship bottom 7 is provided is smaller than the width B2 of the upper side, so that the lid 17 has a tunnel 9. The tunnel 9 is closed obliquely along the outer circumferential surface 7a of the bottom 7 around the doorway 9a of the doorway. As a result, a step or the like is unlikely to occur between the outer circumferential surface 7a of the ship bottom 7 and the surface 17a of the lid portion 17, so that the resistance at the time of hull travel can be reduced.

Furthermore, since the cover portion 17 of the embodiment of the present invention has a wing shape in which the front surface 17a and the rear surface 17b are convexly curved surfaces, the tunnel portion 9 is opened to open the tunnel 9, and the screw in that state. When driving 11, the resistance of fluid such as seawater passing through the tunnel 9 is reduced, and the fuel consumption rate can be improved.

In addition, in the embodiment of the present invention, the shaft portions 19A and 19B fixed to the lid portion 17 are a pair, and the pair of shaft portions 19A and 19B are disposed independently on both sides of the lid portion 17, respectively. As a result, repair and maintenance due to damage to one of the shaft portions 19A and 19B are facilitated.

Moreover, since the drive unit 24 of the embodiment of the present invention opens and closes the lid 17 by using hydraulic pressure, it is possible to obtain a small output and a large output, and also to have low frictional loss and high efficiency.

In particular, the drive device 24 includes a pair of arm portions 23 protruding from each of the pair of shaft portions 19A and 19B and extending in a direction crossing the rotational axis L2 of the shaft portions 19A and 19B. Of the pair of hydraulic cylinders 25A, 25B connected to each of the pair of arm portions 23 to rotate the shaft portions 19A, 19B by tilting the arm portion 23, and the pair of hydraulic cylinders 25A, 25B. The hydraulic pump 27 which supplies hydraulic pressure to both is provided. The hydraulic cylinders 25A and 25B act to incline the arm 23, and the shafts 19A and 19B rotate by the inclined movement of the arm 23 to open and close the lid 17. The cover 17 can be opened and closed efficiently.

Further, in the embodiment of the present invention, the cover closing detection switches 47A and 47B and the cover opening detecting switches 49A and 49B are provided, and the piston rod 25a is detected by the cover opening detecting switches 49A and 49B. The hydraulic pump 27 is stopped. In addition, when the cover opening detection switches 49A and 49B are released and the piston rod 25a is detected by the cover closing detection switches 47A and 47B, the operation of the hydraulic pump 27 is stopped. As a result, the lid 17 can be reliably stopped in the open position or the closed position.

Furthermore, in the embodiment of the present invention, since the locking circuit (locking portion) 43 is provided, the lid portion 17 can be held at a predetermined position, for example, a closed position or an open position. As a result, it is possible to stably reduce the resistance generated at the entrance and exit 9a of the tunnel 9 by removing the influence of the shaking of the lid 17. In particular, since the lid 17 can be held in the closed position, the occurrence of resistance due to the shaking of the lid 17 during hull travel can be suppressed, and the lid 17 can be held in the open position. The occurrence of resistance due to the shaking of the lid 17 when the stars 3 and 5 are operated can be suppressed.

In addition, the embodiment of the present invention is provided with an overload protection circuit (overload protection part) 45, so that when the cover part 17 is overloaded with an external force, the cover part 17 by the locking circuit 43 Since the holding is released, damage to the lid 17 due to overload is avoided.

Furthermore, the bottom 7 is provided with a Bauster star 3 and a stunster star 5, and the cover 17 is provided in each tunnel 9 of the Bauster star 3 and the stunster star 5. Is installed. In the normal hull, fuel consumption is easily reduced by the resistance of the tunnel 9 of the bow thruster 3, which is the side thruster of the bow 1a shaft, but the fuel consumption rate of the bow thruster 3 is reduced. Since the cover part 17 is provided, the reduction of fuel consumption rate can be efficiently suppressed by closing the entrance and exit 9a of the tunnel 9 of the Bauster star 3 with the cover part 17 at the time of normal hull travel. There is a number.

As mentioned above, although this invention was demonstrated concretely based on an Example, this invention is not limited to the said Example. For example, in the said embodiment, when the cover part fell, the case where the surface of a cover part came below the tunnel axis was demonstrated, but it is the same also when it comes to an upper side. In this case, the cover axis is closer to the tunnel axis when the cover axis is opened than the conventional hull where the rotation axis intersects the tunnel axis because the rotation axis of the cover part is lower than the tunnel axis.

In addition, although the wing | cover cover part was demonstrated as an example in the said Example, a flat cover part may be sufficient. In addition, in the above-described embodiment, a driving device using hydraulic pressure has been described as an example of a drive unit that opens and closes the cover part. However, the device may be a device that opens and closes the cover part by a mechanical structure. In addition, in the above embodiment, the detection unit has been described using two switches (cover closing detection switch and cover opening detection switch) for detecting the open position and the closed position of the lid, respectively. It may be in the form of providing only a detection unit for detecting.

1 is a view showing a side thruster hull according to an embodiment of the present invention, (a) is a side view, (b) is a bottom view.

2 is a cross-sectional view taken along the line II-II of FIG. 1.

3 is an enlarged side view of the hydraulic cylinder.

4 is a front view showing a state in which the cover part is closing the entrance and exit of the tunnel.

5 is a plan view of the lid portion.

6 is a view showing a hydraulic circuit of the drive device.

7 is a cross-sectional view of a conventional cover part.

8 is a schematic view for comparing the embodiment of the present invention and the prior art, (a) is a cross-sectional view of the lid portion related to the embodiment of the present invention, (b) is a front view of the lid portion related to the embodiment of the present invention, (c) is sectional drawing of the conventional cover part, (d) is a front view of a conventional cover part.

Explanation of symbols on the main parts of the drawings

1: hull 3: Bausterlast

5: Sternsstar 7: the bottom

9: tunnel 9a: entrance of the tunnel

11 screw 17 cover

17a: surface 17b: back side

19A, 19B: Shaft 23: Female

24: drive device 25A, 25B: hydraulic cylinder

27: hydraulic pump 43: locking circuit

45: overload protection circuit 47A, 47B: cover closed position detection switch

49A, 49B: Cover open position detection switch L1: Tunnel axis

L2: axis of rotation of shaft part Pa: widest part of cover surface

Claims (10)

In the hull with side thruster having a cylindrical tunnel penetrating the bottom and a screw disposed in the tunnel, A cover part for opening and closing the entrance and exit of the tunnel, A shaft part fixed to the cover part and freely supported on the bottom by rotation; Rotation of the said shaft part provides a drive part which stands up the said cover part, closes a tunnel, and falls over the said cover part, and opens a tunnel, The cover portion has a surface facing outward of the tunnel and a rear surface facing inward of the tunnel when the tunnel is closed. The axis of rotation of the shaft portion extends in a direction orthogonal to the tunnel axis of the tunnel and deviates from the tunnel axis, The surface of the cover part at the time of opening the said tunnel becomes closer to a tunnel axis compared with the case where the said rotation axis intersects the said tunnel axis, The ship with a side thruster characterized by the above-mentioned. The method of claim 1, The width | variety of the part which provided the said tunnel of the said ship bottom is narrower than the upper side, The cover part is closed in an oblique manner along the outer circumferential surface of the bottom around the entrance and exit of the tunnel, and closes the tunnel, The axis of rotation of the shaft portion is shifted upward with respect to the tunnel axis, The part of the surface of the said cover part in which the width | variety of the width | variety of the said direction of rotation axis is wide is closer to the said tunnel axis | shaft, compared with the case where the said rotational axis cross | intersects the said tunnel axis | shaft when a tunnel is opened. Hull with star. The method according to claim 1 or 2, The cover portion hull with side thruster, characterized in that the front surface and the rear surface is a convex curved shape. The method according to any one of claims 1 to 3, The shaft has a pair, Said pair of shaft parts are arrange | positioned independently in the both sides of the said cover part, The ship with side thrusters characterized by the above-mentioned. The method of claim 4, wherein The drive unit is a side thruster hull, characterized in that for opening the cover portion using hydraulic pressure. The method of claim 5, The driving unit includes: A pair of arm portions protruding from each of the pair of shaft portions and extending in a direction crossing the axis of rotation of the shaft portion, A pair of cylinders connected to each of the pair of arms to rotate the shaft by tilting the arm; And a hydraulic pump for supplying hydraulic pressure to both of the pair of cylinder portions. The method of claim 6, And the drive portion further comprises a detection portion provided on the cylinder portion and detecting at least one of an open position and a closed position of the lid portion to stop the operation of the hydraulic pump. The method according to any one of claims 5 to 7, And a locking portion for holding the cover portion at a predetermined position by maintaining hydraulic pressure supplied to the cylinder portion when the cover portion closes the tunnel. The method of claim 8, The hull with side thruster further comprises an overload prevention portion for releasing the holding by the locking portion when an external force is overloaded by the cover portion while the cover portion closes the entrance and exit of the tunnel. The method according to any one of claims 1 to 9, The said bottom thrust tunnel is provided in the said bottom in both directions of the front part of a bow side, and the back part of a stern side, The cover portion of the hull with side thruster, characterized in that for opening and closing at least the entrance and exit of the tunnel of the front portion.

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