JP2999432B2 - Elevating side thrusters - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating side thruster for applying a lateral thrust to a ship, and more particularly to an elevating side thruster having a vibration-proof and sound-proof structure.

[0002]

2. Description of the Related Art Observation boats, excavation boats, and the like need to hold the hull at a fixed point during work. These operations are often performed in deep waters and usually do not allow the use of anchors, so that the side thrusters are the only position holding devices. Also, in recent years, lift-type side thrusters capable of generating a larger thrust have been widely adopted in ships.

FIG. 9 shows the structure of such a lifting type side thruster. The elevating side thruster 101 is provided in a storage hole of the hull, and when not in use, the thruster 102 is stored in the hull (solid line). When in use, the thruster 102 protrudes from the ship bottom 142 (virtual line). To apply lateral propulsion to the ship.

[0004]

The side thruster generates a lateral thrust (thrust) to control the position of the ship.
In order to maintain the position of the ship with high accuracy, it is usually operated continuously during work. Therefore, for example, in an observation ship, during operation such as observation, the vibration and noise generated by the side thrusters have an adverse effect on the measurement equipment, and impair the position holding function of the ship.

In general, the vibration and noise sources of the mechanical devices of the lifting type side thrusters are roughly classified into the following four types.

Due to the propeller of the thruster section.
That is, fluid that is generated fluidly by cavitation generated by rotation of a propeller.

Due to the gear case of the thruster section. That is, mechanically generated from bevel gears and bearings inside the gear case.

[0008] Those caused by a driving device such as a driving motor for driving the thruster section.

[0009] Those caused by attached equipment such as a hydraulic source.

FIG. 10 is a diagram showing what kind of noise source the underwater noise generated by the lifting type side thruster having the variable pitch propeller is generated. The horizontal axis indicates the blade angle of the propeller, and is shown as a percentage with respect to the maximum blade angle. In this figure, S1, S2, S3,
The noise component indicated by S4 is
It corresponds to the noise source.

From this figure, it can be seen that as the blade angle increases, that is, as the absorption horsepower of the propeller increases, the overall underwater noise increases sharply. Also, S4
It can also be seen that the noise component is constant regardless of the blade angle.
In particular, it can be seen that the noise components of S1 and S2 are dominant in the entire underwater noise.

The vibration and noise caused by the vibration and noise are hardly radiated outboard because the vibration and noise sources are inside the hull. For example, the vibration and noise can be shielded to some extent on the hull side where the container storage hole is provided. . However, the vibration and noise caused by this cannot be cut off on the hull side.

In addition, as a vibration-proof and sound-proof structure of a ship in which a tunnel thruster is provided in a tunnel passing through the hull,
There is one as shown in FIG. This is because the tunnel 1 near the propeller 102a in the ship tunnel thruster
03 is a double wall structure 103c in which a vibration isolating material 121 is filled between the double walls (see, for example, Japanese Utility Model Publication No. 3-22080). The aim is to prevent the vibration and noise caused by the cavitation of the vertical thruster.
It is considered to be effective to some extent in reducing the vibration and noise caused by the noise.

However, considering that the receiver for position detection is generally located at the bottom of the ship, and that the liftable side thrusters are used to protrude from the ship bottom, the ship equipped with the liftable side thrusters is used. In, it is considered that the adverse effect on the position holding function due to the vibration / noise source caused by the above is incomparable to a ship provided with a tunnel thruster in a tunnel passing through the hull, that is, a ship as shown in FIG. Further, the vibration and noise caused by the vibration and noise proof structure as shown in FIG. 11 cannot be reduced.

[0015]

The lifting type side thruster of the present invention has a container, and a thruster portion and a tunnel portion are provided below the container. The tunnel portion is formed in a double wall structure over substantially the entire circumference of the rotation circle of the propeller of the thruster portion and over substantially the entire length of the container in the front-rear direction. Also, double tunnel
The inner and outer walls of the wall structure have a substantially circular cross section,
The tunnel housing has a substantially rectangular cross section, and the outer wall is
And is joined at its contact point. Sa
In addition, the inside of the double-walled tunnel is filled with anti-vibration material
Have been.

[0016] With the tunnel portion having such a structure, vibration and noise caused by the propeller and the gear case can be effectively absorbed, and the vibration and noise can be reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lifting side thruster according to the present invention is a lifting side thruster which is housed in a storage hole provided in a hull of a ship so as to be able to move up and down freely. A container provided at a lower portion with a tunnel housing portion for housing the thruster portion, and a drive device for driving the thruster portion provided at an upper portion, wherein the tunnel housing portion is formed by a middle wall, a bottom wall, and a side wall of the container; The portion is formed in a double wall structure over substantially the entire circumference of the rotating circle of the propeller of the thruster portion and over substantially the entire length in the front-rear direction of the container, and the inner wall and the outer wall of the double wall structure of the tunnel portion are formed.
The wall is formed in a substantially circular cross section, and the tunnel accommodation portion is substantially
It is formed in a rectangular cross section, and the outer wall is
The double wall structure
An anti-vibration material is filled in the inside of the tunnel.

As described above, the tunnel portion having the double wall structure
The double wall of the tunnel section is formed over substantially the entire circumference of the rotating circle of the propeller and over the entire length of the container in the front-rear direction.
The inner and outer walls of the structure are formed in a substantially circular cross section,
Since the inside of the wall portion of the tunnel portion is filled with the vibration isolating material , the vibration and noise caused by the propeller and the gear case are effectively absorbed here.

Further, it may be lined damping material to the outer peripheral surface of the inner wall of the tunnel portion of the double wall structure, a tunnel housing part, may be filled with a vibration-proof material between the tunnel portion. This is more effective in absorbing vibration and noise caused by the propeller and the gear case.

Further, the entire side wall above the middle wall of the container may be formed in a double wall structure, and the inside of the double wall structure may be filled with a vibration isolator. This is effective in absorbing vibration and noise caused by the driving device provided on the upper part of the container for driving the thruster unit.

Further, based on a vibrometer or a sound level meter provided near the outer peripheral surface of the outer wall of the tunnel portion having the double wall structure, or the output signal of both of them, the rotation speed and / or pitch of the propeller are determined. Control means for controlling may be provided. By doing so, the rotation speed and pitch of the propeller can be controlled to suppress vibration and noise from the propeller and the gear case to such an extent that they do not adversely affect work and position holding.

[0022]

An embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 3 show an embodiment of a lifting type side thruster according to the present invention. FIG. 1 is a longitudinal sectional view of the lifting / lowering side thruster 1, FIG. 2 is a sectional view taken along the arrow A of FIG. 1, and FIG. 3 is a sectional view taken along the arrow B of FIG. An example in which the lifting type side thruster 1 is mounted on an observation ship will be described. That is, a storage hole 41 opened in the bottom of the ship 42 is provided on the hull of the observation ship, and the liftable side thruster 1 is accommodated in the storage hole 41. A support portion 43 is provided inside the hull of the observation ship, and the lifting / lowering side thruster 1 and the support portion 43 are connected by a hydraulic cylinder 8. The hydraulic cylinder 8 is driven to expand and contract, so that the liftable side thruster 1 can be raised and lowered with respect to the hull.

The lift side thruster 1 has a container 10. A thruster unit 2, a tunnel unit 3, and a tunnel storage unit 4 are provided below the container 10.

The tunnel accommodating section 4 is formed in a rectangular cross section by the middle step wall 11, bottom wall 12, and side wall 13 of the container 10, and accommodates the tunnel section 3 therein. The tunnel portion 3 has an inner wall 3a having a circular cross section and an outer wall 3b having a circular cross section.
To form a double wall structure. The outer wall 3b having a circular cross section is inscribed in the tunnel accommodating portion 4 having a rectangular cross section. At this contact point, the middle wall 11, the bottom wall 12, the side wall 13, and the outer wall 3b are joined. For this reason, as can be seen from FIG.
A space having a substantially triangular cross section is formed.

The tunnel 3 is formed over the entire circumference of the rotating circle of the propeller 2a and over the entire length of the container 10 in the front-rear direction. The space between the inner wall 3a and the outer wall 3b is filled with an anti-vibration material 21. As the vibration-proof material 21, a material having excellent damping properties and high vibration-proof effect is preferable. For example, a granular vibration isolator is preferable.

The thruster unit 2 is provided inside the tunnel unit 3. The thruster unit 2 mainly includes a propeller 2a and a gear case 2b. And the propeller 2a
Are arranged so as to be coaxial with the tunnel section 3. The propeller 2a is a variable pitch propeller, and is configured such that its pitch can be changed by a control device. In the gear case 2b, a gear mechanism such as a bevel gear, a bearing, and the like are provided, and these transmit external driving force to the propeller 2a.

A driving motor 5a and a driving force transmitting device 5b are provided on the upper part of the container 10, and the driving device 5 is constituted by these. The driving force of the driving motor 5a is transmitted to the propeller 2a via the driving force transmission device 5b, a gear mechanism in the gear case 2b, and the like. Ancillary equipment such as the hydraulic power source 6 is also provided above the container 10.

A vibrometer 7a is fixed to the outer peripheral surface of the outer wall 3b of the tunnel section 3, and a noise meter 7b is provided at a position slightly away from the outer peripheral surface.

The thruster 2 is supported by arms 9 symmetrically on both sides and linearly projected so that the rotation center axis of the propeller 2a does not deviate from the center axis of the tunnel section 3. I have.

The lift-type side thruster 1 is generally constructed as described above. When the side thruster 1 is stored in the storage hole 41 (solid line), the bottom wall 12 of the container 10 is
With the same plane. When using the lifting / lowering side thruster 1, the hydraulic cylinder 8 is extended to lower the lifting / lowering side thruster 1. Then, the thruster portion 2 projects below the ship bottom 42 as shown by a virtual line.

When the drive motor 5a is driven with the thruster portion 2 protruding, the propeller 2a can be rotated by this driving force, and a lateral propulsion (thrust) can be applied to the hull. When the drive motor 5a is driven, vibration and noise are generated from the gear mechanism and the propeller 2a in the gear case 2b, and the vibration and noise are absorbed by the tunnel section 3. The tunnel section 3 converts the energy of the vibration and noise into thermal energy as much as possible and consumes it, and radiates the energy to the outside. Is formed over. In addition, by forming the maximum allowable length, the internal space of the double wall structure can be enlarged in the front-rear direction. As a result,
Many anti-vibration materials 21 can be filled.
Therefore, the energy of vibration and noise can be absorbed very efficiently.

FIG. 4 shows a state in which the observation vessel 40 holds a position while receiving a signal from a transmitting device 32 provided on the sea floor by a receiver 31. Fig. 4 (a) is a side view, and Fig. 4 (b) is a bottom view as seen from the ship bottom 42. In Fig. 4 (b), arrows indicate lateral thrust (thrust).

The use of the lifting side thruster 1 is as follows.
This is because the position of the hull is maintained by the receiver 31 attached to the bottom 42 during observation, in order to maintain the position of the hull accurately while the observation ship 40 is performing the observation work. Detected.

The receiver 31 is particularly susceptible to vibration and noise. If the vibration and noise are large, accurate position detection cannot be performed. In addition, in general, the lifting side thruster,
During use, the thruster protrudes from the bottom of the ship, so that the thruster easily applies vibration and noise to the receiver. However, in the elevating side thruster 1 according to the present application, as described above, the vibration and noise generated due to the propeller 2a and the gear case 2b are effectively reduced by the structure of the tunnel portion 3 and the vibration isolator 21 therein. Absorbed.
Therefore, the adverse effects of vibration and noise on the receiver 31 can be minimized, so that accurate position detection can be performed and accurate position holding can be performed.

FIG. 5 shows an apparatus for controlling the rotation speed and pitch of the propeller 2a based on the output signals of the vibration meter 7a and the sound level meter 7b. As described above, the propeller 2a
Is a variable pitch propeller, the pitch of which is changed by a control device 51 as control means. Propeller 2
The rotation speed of a is also controlled by the control device 51. The control device 51 receives the output signals of the vibrometer 7a and the sound level meter 7b, and based on these signals, adjusts the pitch of the propeller 2a so that the vibration / noise does not disturb the observation work and the position holding. Control the speed. According to such a device, it is possible to effectively reduce vibration and noise that have a serious adverse effect on the observation work and position detection of the observation ship 40. Although the vibration meter 7a and the sound level meter 7b are provided in FIG. 5, only one of them may be provided to control the pitch and the rotation speed of the propeller 2a based on the output signal. In addition, the control device 51 may control only the pitch of the propeller 2a, only the rotation speed, or may control both the pitch and the rotation speed.

FIG. 6 shows another embodiment of the liftable side thruster according to the present invention. The liftable side thruster 61 fills the inside of the tunnel portion 3 having the double wall structure with the vibration damping material 21 and also lines the vibration damping material 22 on the outer peripheral surface of the inner wall 3a. The other structure is the same as that of the lifting side thruster 1 shown in FIGS. Since the vibration damping material 22 lined in this way also absorbs the vibration and noise generated from the propeller 2a and the gear case 2b and converts it into heat energy, it has the effect of reducing the vibration and noise radiated to the outside. Can be. As the lining material, that is, the damping material 22, for example, a polymer material is preferable.

FIG. 7 shows still another embodiment of the lifting side thruster according to the present invention. The vertically movable side thruster 71 not only fills the interior of the tunnel portion 3 with the vibration isolating material 21 but also prevents the space formed between the tunnel housing portion 4 and the tunnel portion 3 having a substantially triangular cross section. The vibration material 23 is filled. The other structure is the same as that of the lifting side thruster 1 shown in FIGS.
The vibration isolator 23 filled in this way also has the effect of absorbing the vibration and noise generated from the propeller 2a and the gear case 2b and reducing the vibration and noise radiated to the outside. As the vibration damping material 23, a material having excellent damping properties and a high vibration damping effect is preferable. For example, a granular vibration damping material is preferable.

FIG. 8 shows still another embodiment of the lifting type side thruster according to the present invention. 8A is a longitudinal sectional view, and FIG. 8B is a sectional view taken along the arrow A in FIG. 8A. In the liftable side thruster 81, the entire side wall 13A above the middle step wall 11 of the container 10 is formed in a double wall structure. The interior of the double wall structure is filled with a vibration isolator 24. Other structures are shown in Figs.
This is the same as the lifting side thruster 1 shown in FIG. When the vibration isolator 24 is filled in this manner, vibration and noise generated from the drive motor 5a, the driving force transmission device 5b, the hydraulic power source 6, and the like provided particularly on the upper portion of the container 10 can also be absorbed. As the vibration damping material 24, a vibration damping material having excellent damping properties and a high vibration damping effect is preferable. For example, a granular vibration damping material is preferable.

In the above embodiment, the observation ship is taken as an example of a ship. However, the lifting type side thruster according to the present invention is applicable not only to an observation ship but also to any ship that needs to maintain a position such as an excavation ship. is there.

In the above embodiment, the tunnel portion is
It is formed over the entire circumference of the rotating circle of the propeller and over the entire length of the container in the front-rear direction. However, the tunnel portion need not be formed so as to completely surround the propeller, but may be formed over substantially the entire circumference.
In addition, even if it is not formed to have a length equal to the total length of the container in the front-rear direction, it may be formed over substantially the entire length. This is because even with such a configuration, the desired effect of the present invention is substantially achieved.

[0042]

The present invention is embodied in the form described above and has the following effects.

In the lifting side thruster of the present invention, the vibration and noise caused by the propeller and the gear case of the thruster portion are effectively absorbed by the tunnel portion having the double wall structure.

[0044] Further, when such lining damping material to the outer peripheral surface of the inner wall of the tunnel portion of the double-wall structure, it can be more effectively absorb vibration and noise caused by the propeller and the gear case.

Further, even if a vibration isolating material is filled between the tunnel accommodating portion and the tunnel portion, vibration and noise caused by the propeller and the gear case can be more effectively absorbed.

Further, when the entire side wall above the middle wall of the container is formed into a double wall structure, and the inside of the double wall structure is filled with a vibration isolating material, the upper part of the container can be driven to drive the thruster. Vibration and noise caused by the driving device provided in the vehicle can be effectively absorbed.

Further, based on a vibrometer or a sound level meter provided near the outer peripheral surface of the outer wall of the double-walled tunnel portion, or the output signal of both of them, the rotation speed and / or the pitch of the propeller are determined. When the control means for controlling is provided, the rotation speed and pitch of the propeller can be controlled to suppress the vibration and noise from the propeller and the gear case to such an extent that the work and the position holding are not adversely affected.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of an elevating side thruster according to the present invention, and is a longitudinal sectional view of the elevating side thruster.

FIG. 2 is a sectional view taken in the direction of arrow A in FIG.

FIG. 3 is a sectional view taken in the direction of arrow B in FIG. 1;

FIG. 4 is a diagram showing a state in which the observation ship is holding a position while receiving a signal from a transmitting device provided on the sea floor by a receiver. FIG. 4A is a side view, and FIG.
(B) is the bottom view seen from the ship bottom side.

FIG. 5 is a diagram showing an apparatus for controlling the rotation speed and pitch of a propeller based on output signals of a vibration meter and a sound level meter.

FIG. 6 is a view showing another embodiment of the lifting side thruster according to the present invention.

FIG. 7 is a view showing still another embodiment of the lifting side thruster according to the present invention.

FIG. 8 shows still another embodiment of the lifting side thruster according to the present invention. 8A is a longitudinal sectional view, and FIG. 8B is a sectional view taken along the arrow A in FIG. 8A.

FIG. 9 is a view showing the structure of a lifting side thruster.

FIG. 10 is a diagram illustrating what kind of noise source is generated by underwater noise generated by a lifting type side thruster having a variable pitch propeller.

FIG. 11 is a diagram showing a vibration-proof / sound-proof structure of a ship provided with a tunnel thruster in a tunnel passing through the hull.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Elevating type side thruster 2 ... Thruster part 2a ... Propeller 2b ... Gear case 3 ... Tunnel part 3a ... Inner wall 3b ... Outer wall 4 ... Tunnel accommodation part 5 ... Drive device 5a ... Drive motor 5b ... Drive force transmission device 6 ... Hydraulic power source 7a ... vibration meter 7b ... sound level meter 8 ... hydraulic cylinder 9 ... arm 10 ... container 11 ... middle step wall 12 ... bottom wall 13 ... side wall 41 ... storage hole 42 ... ship bottom 43 ... support part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-75900 (JP, A) JP-A-63-145194 (JP, A) JP-A-60-176895 (JP, A) 22496 (JP, U) Japanese Utility Model Application 5-86797 (JP, U) Japanese Utility Model Application No. 60-189499 (JP, U) Japanese Utility Model Application No. 62-129000 (JP, U) Japanese Utility Model Application No. 62-97097 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B63H 25/42 B63H 21/30 B63H 3/00

Claims (5)

(57) [Claims] An up-and-down type side thruster housed in a storage hole provided in a hull of a ship so as to be able to move up and down, wherein a thruster portion, a tunnel portion, and a tunnel housing portion for housing the tunnel portion are provided at a lower portion. A container provided with a driving device for driving the thruster unit at an upper part thereof; the tunnel accommodating unit is formed by a middle wall, a bottom wall, and a side wall of the container; and the tunnel unit is substantially equivalent to a rotating circle of a propeller of the thruster unit. over the entire circumference and are formed in the double wall structure over the longitudinal direction substantially the entire length of the container, the inner and outer walls are generally circular double-wall structure of the tunnel portion
The tunnel housing is formed in a substantially rectangular cross section.
And the outer wall is inscribed in the tunnel housing and is
It engaged, vibration-proof material is filled in the tunnel portion of the double wall structure
Elevating side thrusters. 2. The lifting / lowering side thruster according to claim 1 , wherein a damping material is lined on an outer peripheral surface of an inner wall of the tunnel portion having the double wall structure. 3. The lift side thruster according to claim 1 , wherein a vibration isolator is filled between the tunnel housing portion and the tunnel portion. 4. A form the entire upper portion of the side wall than the middle wall of the container double-walled structure, and filled with an internal anti-vibration member of the double-walled structure, in any one of claims 1 3 Elevating side thruster as described . 5. A vibrometer provided in the vicinity of the outer peripheral surface of the outer wall of the tunnel portion of the double wall structure, and / or, based on the output signal of the noise meter, the rotational speed of the propeller, and / or the pitch 5. The method according to claim 1 , further comprising control means for controlling.
2. The liftable side thruster according to claim 1.