Vibration isolation system of ship bow thruster

Abstract

The invention provides a ship bow thruster vibration isolation system which can improve the vibration isolation effect. The ship bow thruster comprises a bow thruster motor and a thruster; the bow thruster motor and the thruster are rigidly installed on the inner cylinder, the outer cylinders are coaxially arranged at the two axial ends of the inner cylinder, the flexible connecting pipes are installed between the inner cylinder and the outer cylinders at the two ends, and the outer cylinders are rigidly connected with the hull connecting cylinder. The side hanging vibration isolator is installed between the inner cylinder upper support and the outer cylinder upper support, and the bottom supporting vibration isolator is installed between the inner cylinder lower support and the ship body support. A flow guide ring is further installed between the inner cylinder and the outer cylinder. According to the vibration isolation system, various types of vibration isolators are arranged at the installation position of the bow thruster, the vibration isolation effect of the vibration isolators is improved, the magnitude of vibration transmitted to a ship body is reduced, and the purpose of improving the comfort of the ship is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of vibration isolation systems, specifically to a kind of ship bow thrust device vibration isolation system, belong to vibration isolation noise reduction technical field. BACKGROUND

[0002] Ship bow thrust device is a kind of equipment installed in the bow of ship, provides lateral thrust for ship. Bow thrust device greatly improves the low-speed maneuverability of ship, plays an important role in ship berthing, unberthing and turning operation. Ship bow thrust device is frequently started and stopped, and the working condition is complex and changeable, which causes large impact vibration to the ship structure. In tourist ship and luxury cruise ship, the bow of ship is generally the activity area of tourists, such as dining room, guest room, etc. The impact vibration generated in the operation of bow thrust device has a great influence on the comfort experience of tourists.

[0003] In cargo ship, the requirement for vibration control is not high, and the bow thrust device is generally rigidly installed on the ship body, i.e. no damping measures are taken. In tourist ship and luxury cruise ship, the requirement for comfort is relatively high, and certain damping measures have been taken for the bow thrust device. The existing technical solution is to install a rubber sealing strip at the connection between the bow thrust device and the ship body, and to increase a rubber sleeve outside the fastening bolt, so as to reduce the vibration level transmitted to the ship body by the sealing strip and the rubber sleeve. However, due to the size limitation of the sealing structure and the installation structure, the specifications and vibration isolation performance of the sealing strip and the rubber sleeve cannot be improved any more, and the actual vibration isolation effect has reached the limit, so it is necessary to design a new vibration isolation system. SUMMARY

[0004] Therefore, the present application provides a ship bow thrust device vibration isolation system, which can improve the vibration isolation effect and solve the problem that the vibration of the existing bow thrust device is transmitted to the ship body, affecting the comfort of the ship.

[0005] The technical solution of the present application is as follows: a ship bow thrust device vibration isolation system, the ship bow thrust device comprises a bow thrust motor and a propeller; the vibration isolation system comprises an inner cylinder, an outer cylinder, a side-hung vibration isolator, a flexible connecting pipe and a bottom support vibration isolator;

[0006] The ship bow thrust device is rigidly installed on the inner cylinder;

[0007] The axial both ends of the inner cylinder are coaxially provided with the outer cylinders respectively, and the outer cylinders at both ends are connected with the inner cylinder through the flexible connecting pipe; the axial other end of the two outer cylinders is connected with the ship body connecting cylinder arranged at the corresponding position respectively;

[0008] The upper part of the outer circumferential surface of the axial both ends of the inner cylinder is provided with an inner cylinder upper support; the upper part of the outer circumferential surface of the opposite end of the two outer cylinders and the inner cylinder is provided with an outer cylinder upper support; a plurality of side-hung vibration isolators are arranged between the inner cylinder upper support and the outer cylinder upper support at each end in transverse direction.

[0009] The lower part of the outer circumferential surface of the inner cylinder at both axial ends is provided with an inner cylinder lower support; and a plurality of bottom support vibration isolators are arranged in parallel between the inner cylinder lower support and the ship body support at each end in the transverse direction.

[0010] As a preferred mode of the present application: a flow guide ring is coaxially arranged between the inner cylinder and the outer cylinder;

[0011] The flow guide ring is located inside the flexible connecting pipe at the corresponding end;

[0012] One end of the flow guide ring is mounted on the inner cylinder; the other end extends into the outer cylinder to a specified length, and there is a gap between the outer circumferential surface of the flow guide ring and the inner circumferential surface of the outer cylinder.

[0013] As a preferred mode of the present application: the outer surface of the outer cylinder, the outer surface of the ship body connecting cylinder, the outer surface of the outer cylinder upper support, and the side surface of the ship body support are all coated with damping material.

[0014] As a preferred mode of the present application: the bow side thrust motor and the propeller are rigidly mounted on the inner cylinder, respectively.

[0015] As a preferred mode of the present application: the side-hung vibration isolator is provided with an upper adjusting gasket on the abutting surface of the outer cylinder upper support; and the bottom support vibration isolator is provided with a lower adjusting gasket on the abutting surface of the inner cylinder lower support.

[0016] As a preferred mode of the present application: the side-hung vibration isolator and the bottom support vibration isolator are vibration isolators with a limiting function.

[0017] As a preferred mode of the present application: a sealing structure is arranged on the abutting surface of the flexible connecting pipe at both ends and the inner cylinder and the outer cylinder.

[0018] As a preferred mode of the present application: the bow side thrust device and the vibration isolation system are integrated into a module.

[0019] Beneficial effects:

[0020] (1) The ship bow side thrust device vibration isolation system of the present application can cut off the path of vibration transmission from the ship bow side thrust device to the ship body, uses multiple types of vibration isolators, and improves the vibration isolation effect; the influence of the ship bow side thrust device vibration on the ship body is smaller, and the ship comfort is improved.

[0021] (2) In the present application, the bow side thrust device and its vibration isolation system (excluding the ship body connecting cylinder and the ship body support) are modularly designed and integrated into a module, which is convenient for installation and replacement and maintenance.

[0022] (3) The flow guide ring arranged between the inner cylinder and the outer cylinder can not only prevent flow noise caused by water flow impacting the cavity between the inner cylinder and the outer cylinder, but also protect the flexible connecting pipe from damage by sundries in the water flow.

[0023] (4) The damping material applied to the steel structure (the outer side of the outer cylinder, the outer side of the hull connecting cylinder, the outer side of the upper support of the outer cylinder and the side surface of the hull support) can further inhibit the transmission of vibration to the hull. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a front view of the ship bow thrust device vibration isolation system of the present application.

[0025] Figure 2 It is a side view of the ship bow thrust device vibration isolation system of the present application.

[0026] Figure 3 It is a schematic diagram of the arrangement of the side-mounted vibration isolator.

[0027] Figure 4 It is a schematic diagram of the arrangement of the bottom support vibration isolator.

[0028] 1 - ship bow thrust device; 2 - inner cylinder; 3 - outer cylinder; 4 - hull connecting cylinder; 5 - upper support of the inner cylinder; 6 - upper support of the outer cylinder; 7 - lower support of the inner cylinder; 8 - hull support; 11 - side-mounted vibration isolator; 12 - flexible connecting pipe; 13 - flow guide ring; 14 - bottom support vibration isolator; 15 - damping material; 21 - upper adjusting gasket; 22 - lower adjusting gasket; 23 - mounting bolt A; 24 - mounting bolt B; 25 - mounting bolt C; 26 - mounting bolt D; 27 - mounting bolt E; 28 - mounting bolt F. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in combination with the drawings and examples.

[0030] The present application provides a ship bow thrust device vibration isolation system, which improves the vibration isolation effect of the vibration isolator, reduces the vibration level transmitted to the hull and improves the comfort of the ship by arranging various types of vibration isolators at the installation position of the bow thrust device.

[0031] The ship bow thrust device 1 comprises a bow thrust motor and a propeller; and the ship bow thrust device 1 is installed on the hull through the ship bow thrust device vibration isolation system.

[0032] As Figure 1 and Figure 2As shown, the ship bow thruster device vibration isolation system comprises: an inner cylinder 2, an outer cylinder 3, an inner cylinder upper support 5, an outer cylinder upper support 6, an inner cylinder lower support 7, a side-hung vibration isolator 11, a flexible connecting pipe 12, a flow guide ring 13, a bottom support vibration isolator 14, a damping material 16, an upper adjusting gasket 21 and a lower adjusting gasket 22.

[0033] The ship bow thruster device 1 (i.e. the bow thruster motor and the propeller) is rigidly mounted on the inner cylinder 2; wherein the axis of the bow thruster motor is perpendicular to the axis of the inner cylinder 2, vertically above the inner cylinder 2; the propeller is located inside the inner cylinder 2. In order to ensure the relative positioning accuracy of the bow thruster motor and the propeller, both are rigidly mounted on the inner cylinder 2 (i.e. the bow thruster motor and the propeller are connected with the inner cylinder 2 respectively), so the vibration of the bow thruster motor and the vibration of the propeller are transmitted to the inner cylinder 2, and the attenuation in the transmission process is small.

[0034] The axial ends of the inner cylinder 2 are coaxially provided with the outer cylinder 3 respectively, and the outer cylinders 3 at both ends are spaced apart from the inner cylinder 2. The flexible connecting pipe 12 is a flexible connecting pipe with small rigidity, which is installed between the outer cylinder 3 at both ends and the inner cylinder 2 (i.e. the axial ends of the inner cylinder 2 are connected with the outer cylinder 3 at the corresponding end through the flexible connecting pipe 12 respectively).

[0035] As an example, as shown in the figure, Figure 3 The abutting end of the outer cylinder 3 and the inner cylinder 2 is provided with a shaft shoulder (i.e. an outer convex circular table), and the two ends of the flexible connecting pipe 12 are provided with flanges, which are connected through mounting bolts C25 on the flanges and the shaft shoulders at the corresponding positions of the outer cylinder 3 and the inner cylinder 2. The flexible connecting pipe 12 can be made of rubber material, composite material, flexible metal structure, etc., which has good isolation effect on vibration. Therefore, the vibration is transmitted from the inner cylinder 2 to the outer cylinder 3 through the flexible connecting pipe 12, and the vibration level is greatly reduced.

[0036] As shown in the figure, Figure 2 The upper part of the outer circumferential surface of the axial ends of the inner cylinder 2 is symmetrically provided with the inner cylinder upper support 5; the upper part of the outer circumferential surface of the opposite ends of the two outer cylinders 3 is provided with the outer cylinder upper support 6. A plurality of side-hung vibration isolators 11 are arranged in parallel between the inner cylinder upper support 5 and the outer cylinder upper support 6 at each end in the transverse direction; the side-hung vibration isolators 11 at both ends are symmetrically arranged along the axis of the bow thruster motor; preferably, the side-hung vibration isolators 11 at each end are uniformly distributed in the transverse direction. As an example, three side-hung vibration isolators 11 are arranged in parallel between the inner cylinder upper support 5 and the outer cylinder upper support 6 at each end in the transverse direction. The side-hung vibration isolators 11 can be selected from rubber material vibration isolators, metal spring vibration isolators, air spring vibration isolators, etc., which have good isolation effect on vibration. The side-hung vibration isolators 11 are used to balance the overturning moment and the rotating moment of the bow thruster device 1 during operation, and to reduce the vibration transmitted from the inner cylinder 2 to the outer cylinder 3.

[0037] As an example, as shown in Figure 3 The bottom plate of the side-hung vibration isolator 11 is fixed to the inner cylinder upper support 5 by mounting bolts B24, and the top plate of the side-hung vibration isolator 11 is fixed to the outer cylinder upper support 6 by mounting bolts A23.

[0038] As shown in Figure 2 The inner cylinder 2 is provided with an inner cylinder lower support 7 on the outer circumferential surface of each axial end; a plurality of bottom support vibration isolators 14 are arranged in parallel between the inner cylinder lower support 7 and the hull support 8 on each end in the transverse direction; the bottom support vibration isolators 14 on both ends are symmetrically arranged along the axis of the bow thruster motor; preferably, the bottom support vibration isolators 14 on each end are evenly spaced in the transverse direction. The bottom support vibration isolators 14 are used to balance the gravity of the bow thruster device and the overturning moment and the turning moment during operation, and can also reduce the vibration transmitted from the inner cylinder 2 to the hull support 8. As an example, two bottom support vibration isolators 14 are arranged in parallel between the inner cylinder lower support 7 and the hull support 8 on each end in the transverse direction.

[0039] The bottom support vibration isolator 14 can be selected from rubber vibration isolators, metal spring vibration isolators, air spring vibration isolators, etc., which have good vibration isolation effect. As shown in Figure 4 The bottom plate of the bottom support vibration isolator 14 is fixed to the hull support 8 by mounting bolts F28, and the top plate of the bottom support vibration isolator 14 is fixed to the inner cylinder lower support 7 by mounting bolts E27.

[0040] The flow guide ring 13 is a cylindrical structure coaxially arranged between the inner cylinder 2 and the outer cylinder 3 (i.e. the outer cylinder 3 is also provided with a flow guide ring 13 on the corresponding end of the inner cylinder 2 on both axial ends); the flow guide ring 13 is located inside the corresponding end flexible connection pipe 12; the flow guide ring 13 is used to guide the water flow in the cylinder (including the inner cylinder 2 and the outer cylinder 3), prevent the water flow from impacting the cavity between the inner cylinder 2 and the outer cylinder 3 to generate flow noise, and at the same time protect the flexible connection pipe 12 from damage by impurities in the water flow. The end of the flow guide ring 13 opposite to the inner cylinder 2 is provided with a flange, and the outer diameter size matches the inner diameter of the outer cylinder 3. As shown in Figure 3 The end of the flow guide ring 13 is provided with a flange, which is installed on the inner cylinder 2 by mounting bolts D26 on the flange; the other end extends into the outer cylinder 3 for a certain length, and there is a gap between the outer circumferential surface of the flow guide ring 13 and the inner circumferential surface of the outer cylinder 3.

[0041] The hull is provided with a hull connection cylinder 4 connected to the two outer cylinders 3, i.e. the other axial end of the two outer cylinders 3 is rigidly connected to the hull connection cylinder 4 provided on the hull. After the bow thruster device 1 and each vibration isolation device are installed, the hull connection cylinder 4 is made according to the actual size and is rigidly connected to the outer cylinder 3.

[0042] Further, damping material 15 is applied to the outer surface of the outer cylinder 3, the outer surface of the hull connecting cylinder 4, the outer surface of the outer cylinder upper support 6 and the side surface of the hull support 8. The damping material 15 is a composite material applied to the surface of a steel plate, which absorbs vibration energy through the deformation of the damping layer and the constraint layer, and further reduces the vibration level transmitted to the hull.

[0043] As an example, the bow thruster and its vibration isolation system (not including the hull connecting cylinder 4 and the hull support 8) are integrated into a module during production, which facilitates installation at the shipyard. That is, in actual use, the bow thruster and its vibration isolation system are directly connected to the hull connecting cylinder 4 and the hull support 8 provided on the hull as a whole.

[0044] In actual use, the type, size and number of the side-hung isolators 11, the bottom support isolators 14 and the flexible connecting pipes 12 need to be determined after design, calculation and optimization according to the technical parameters of the bow thruster. The length (size A) of the flow guide ring 13 and the gap (size B) between the flow guide ring 13 and the outer cylinder 3 need to be calculated to determine the optimal parameters of the deformation and inclination angle of the side-hung isolators 11, the bottom support isolators 14 and the flexible connecting pipes 12.

[0045] Further, the top plate mounting surface of the side-hung isolator 11 (i.e. the abutting surface with the outer cylinder upper support 6) is provided with an upper adjusting shim 21, and the total height of the side-hung isolator 11 and the upper adjusting shim 21 is size C; the top plate mounting surface of the bottom support isolator 14 (i.e. the abutting surface with the inner cylinder lower support 7) is provided with a lower adjusting shim 22, and the total height of the bottom support isolator 14 and the lower adjusting shim 22 is size D. After installation of the bow thruster and debugging and trial operation, appropriate thickness adjusting shims can be made to replace the original upper adjusting shim 21 and lower adjusting shim 22 according to the actual needs of size A and size B, so that the side-hung isolator 11 and the bottom support isolator 14 can achieve the best working state.

[0046] As an example, the side-hung isolator 11 and the bottom support isolator 14 are selected to have a limiting function, which can limit further deformation when the deformation of the isolator exceeds the set value, thereby protecting the bow thruster 1 of the ship.

[0047] As an example, a sealing structure is provided on the outer side of the flanges at both ends of the flexible connecting pipe 12, which is in close contact with the outer cylinder 3 and the inner cylinder 2 after installation, thereby playing a sealing role to prevent water in the cylinder from leaking into the hull.

[0048] In summary, the above is only a preferred embodiment of the present application, and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A vibration isolation system for a ship's bow thruster, wherein the bow thruster (1) comprises a bow thruster motor and a propeller; characterized in that: The vibration isolation system includes: an inner cylinder (2), an outer cylinder (3), a side-mounted vibration isolator (11), a flexible connecting pipe (12), and a bottom-supported vibration isolator (14); The bow thruster (1) is rigidly mounted on the inner cylinder (2); The inner cylinder (2) has an outer cylinder (3) coaxially arranged at both ends of its axial direction. The outer cylinders (3) at both ends are connected to the inner cylinder (2) through the flexible connecting pipe (12). The other ends of the two outer cylinders (3) are respectively connected to the hull connecting cylinders (4) arranged at corresponding positions. The inner cylinder (2) is provided with an upper inner cylinder support (5) on the upper part of the outer circumferential surface at both ends of the axial direction; the two outer cylinders (3) are provided with an upper outer cylinder support (6) on the upper part of the outer circumferential surface at the opposite ends of the inner cylinder (2); a number of side-mounted vibration isolators (11) are arranged in parallel along the transverse direction between the upper inner cylinder support (5) and the upper outer cylinder support (6) at each end; The lower part of the outer circumferential surface at both ends of the inner cylinder (2) is provided with an inner cylinder lower support (7); several bottom support vibration isolators (14) are arranged in parallel along the transverse direction between the inner cylinder lower support (7) at each end and the hull support (8).

2. The vibration isolation system for a ship's bow thruster as described in claim 1, characterized in that: It also includes a flow guide ring (13) coaxially disposed between the inner cylinder (2) and the outer cylinder (3); The flow guide ring (13) is located inside the corresponding end flexible connecting pipe (12); One end of the guide ring (13) is installed on the inner cylinder (2); the other end extends into the outer cylinder (2) for a set length, and there is a gap between the outer circumferential surface of the guide ring (13) and the inner circumferential surface of the outer cylinder (3).

3. The vibration isolation system for a ship's bow thruster as described in claim 1, characterized in that: Damping material (15) is applied to the outside of the outer cylinder (3), the outside of the hull connecting cylinder (4), the outside of the upper support (6) of the outer cylinder, and the side surface of the hull support (8).

4. The vibration isolation system for a ship's bow thruster as described in claim 1, 2, or 3, characterized in that: The bow thruster and propeller are rigidly mounted on the inner cylinder (2).

5. The vibration isolation system for a ship's bow thruster as described in claim 1, 2, or 3, characterized in that: The side-mounted vibration isolator (11) is fitted with an upper adjusting shim (21) on the mating surface with the upper support (6) of the outer cylinder; The bottom support vibration isolator (14) and the inner cylinder lower support (7) are equipped with a lower adjustment shim (22).

6. The vibration isolation system for a ship's bow thruster as described in claim 1, 2, or 3, characterized in that: The side-mounted vibration isolator (11) and the bottom support vibration isolator (14) are vibration isolators with limit function.

7. The vibration isolation system for a ship's bow thruster as described in claim 1, 2, or 3, characterized in that: The flexible connecting pipe (12) has a sealing structure on the mating surface between its two ends and the outer cylinder (3) and the inner cylinder (2).

8. The vibration isolation system for a ship's bow thruster as described in claim 1, 2, or 3, characterized in that: The bow thruster (1) and the vibration isolation system are integrated into a single module.

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