CN110683027A - Emergency vibration damper after ship propeller blade damage - Google Patents
Emergency vibration damper after ship propeller blade damage Download PDFInfo
- Publication number
- CN110683027A CN110683027A CN201911020622.XA CN201911020622A CN110683027A CN 110683027 A CN110683027 A CN 110683027A CN 201911020622 A CN201911020622 A CN 201911020622A CN 110683027 A CN110683027 A CN 110683027A
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- CN
- China
- Prior art keywords
- fixing device
- constraint structure
- mass block
- propeller
- propeller shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/15—Propellers having vibration damping means
Abstract
Emergent vibration damper behind boats and ships screw paddle damage belongs to boats and ships navigation safety field. The structure of the invention comprises a mass block, a constraint structure and a fixing device, wherein the mass block and the constraint structure are fixed on a propeller shaft through the fixing device, one end of the constraint structure is connected with the propeller shaft, the other end of the constraint structure is connected with the mass block, the constraint structure consists of a chain and a rope with bending or folding functions, the fixing device is a device for remote control release, the fixing device is an electromagnet, the mass block is embedded on the propeller shaft, and the constraint structure and the fixing device are positioned between the mass block and the propeller shaft body. The invention has quite simple structure, can improve the safety of the propeller and the shafting, and further ensure the propulsion of the ship; the development of the device has good prospect, can greatly reduce and even prevent series of damages caused by blade fracture, and can be used as a method for ship damage control.
Description
Technical Field
The invention belongs to the field of ship navigation safety, and particularly relates to an emergency vibration damper after a ship propeller blade is damaged.
Background
In boats and ships and aircraft navigation process, the safety of engine screw is vital, and screw blade fracture and damage not only damages screw itself, can produce huge vibration and moment of torsion impact after the screw paddle is damaged, can tie up shafting and gear box, causes whole driving system's destruction, causes huge economic loss and navigation accident.
When the propeller is broken in a working state, the propeller generates a great centrifugal force due to mass distribution, so that the propeller shaft generates irregular vibration deviating from the axis, and the safety of the shafting and the propelling performance of the ship are seriously affected. Therefore, after the blades are damaged, emergency treatment is particularly important for the blades in time, the invention provides an emergency vibration damping device after the blades are damaged, which is used for dealing with the emergency state that the propeller blades are broken, and the device can throw out the blades by means of inertia after the blades are damaged to a certain degree, so that the eccentric vibration is reduced by adjusting the mass distribution.
Disclosure of Invention
Aiming at the problems, the invention provides an emergency vibration damping device after a ship propeller blade is damaged.
In order to achieve the purpose, the emergency vibration damping device for the damaged propeller blade of the ship structurally comprises a mass block 3, a constraint structure 4 and a fixing device 8, wherein the mass block 3 and the constraint structure 4 are fixed on a propeller shaft through the fixing device 8, one end of the constraint structure 4 is connected with the propeller shaft, and the other end of the constraint structure 4 is connected with the mass block 3.
The constraint structure 4 is composed of chains and ropes with bending or folding functions.
The securing device 8 is a device for remote release.
The fixing device 8 is an electromagnet.
The mass 3 is embedded on the propeller shaft, and the constraint structure 4 and the fixing device 8 are positioned between the mass 3 and the propeller shaft body.
The constraint structure 4 is a hinge or a high strength fiber.
The invention has the beneficial effects that:
the emergency vibration damping device for the damaged propeller blades of the ship, provided by the invention, has a quite simple structure, and can improve the safety of the propeller and a shafting so as to ensure the propelling property of the ship; the development of the device has good prospect, can greatly reduce and even prevent series of damages caused by blade fracture, and can be used as a method for ship damage control.
Drawings
Fig. 1 is a schematic view of the vibration damping device in the direction of the propeller shaft of the present invention.
Fig. 2 is a layout schematic of the position of the vibration damping device in the shaft side direction and the blade root section of the invention.
Fig. 3 is a schematic layout of the non-working damping device in the section of the propeller shaft of the invention.
Fig. 4 is a schematic view of the vibration damping device in an operating state of the present invention.
FIG. 5 is a schematic view of the vibration device in a cross section of the propeller shaft in the axial direction according to the present invention.
The specific implementation mode is as follows:
the invention is further described with reference to the accompanying drawings in which:
example 1
The emergency vibration damper after the ship propeller blade is damaged consists of a mass block, a constraint structure and a fixing device. The mass block is embedded on the propeller shaft, the constraint structure and the fixing device are positioned between the mass block and the propeller shaft body, and the fixing device fixes the mass block and the constraint structure and releases the mass block and the constraint structure after the device works.
The utility model provides an emergent vibration damper after paddle damage, this device inlay in the oar epaxial fixedly when the paddle is safe, by the great matter piece of a density, connect the restraint structure of matter piece and oar axle to and the fixer of device is constituteed, the restraint can be the hinge, the fibre of higher strength etc. the fixer can be through all kinds of modes and the structure of the release matter piece that can control, like the electro-magnet, and each device corresponds a slice paddle in order to guarantee balancedly. When the device is activated, the mass is no longer fixed and can be thrown out by the inertia of the rotation of the propeller, while the constraint structure is deployed by the mass. And the constraining structure will prevent the mass from deviating from the design position as it advances.
The aim of the vibration compensation device for blade fracture is to balance the uneven stress caused by blade loss and the centrifugal force brought to the propeller shaft by utilizing the outward movement of the propeller mass, thereby reducing the eccentric vibration of the propeller shaft. The device can improve the safety of the propeller and the shafting, and further guarantee the propulsion of the ship. The development of the device has good prospect, and the important propeller shaft system can be protected in practical application.
The vibration compensation device has a quite simple structure, can greatly reduce or even prevent series of damages caused by blade fracture, and can be used as a method for ship damage control.
When the ship sails, if the propeller blade is broken to cause eccentric vibration of the propeller shaft, the fixing device is operated, the fixing device in the figure 5 releases the fixation of the mass block and the constraint structure, the mass block can be thrown out due to the rotation inertia of the propeller after being separated from the fixation and drives the constraint device to be unfolded, the constraint device designed according to different requirements stabilizes the mass block at a reasonable position, and then the unfolded device rotates along with the propeller to reduce the vibration of the propeller shaft.
Fig. 1 is a schematic view of a vibration damping device, wherein a complete blade 1, a broken blade 2, a thrown mass 3 and an unfolded constraint structure 4 are arranged in the direction of a blade axis; FIG. 2 is a schematic layout of the positions of the shaft-side damping device and the blade root section, the upper surface of the mass 3 and the blade 1 section; FIG. 3 is a schematic layout of a non-working damping device in the section of a propeller shaft, the section of a mass 3, the section of a fixing device 8 and a stacked constraint structure 4; fig. 4 is a schematic view of the vibration damping device in a working state, the mass 3 being thrown out, and the constraint structure 4 being unfolded; fig. 5 is a schematic view of the vibration device in a blade axis section in the axial direction, with a section of mass 3 and a section of fixture 8.
Example 2
A vibration compensator for a propeller blade in a fracture state is provided, which is capable of reducing eccentric vibration occurring behind the propeller blade to protect a shafting.
The device comprises a detachable mass, a constraint structure and a fixing device. The mass is released when the blade breaks and creates a hazard, and the post-constraining structure ensures that the mass does not move irregularly when moving furthest away from the shaft. Thereby realizing the purpose of reducing the eccentric vibration of the propeller shaft by adjusting the mass distribution.
When the device does not work, the mass block and the constraint structure are embedded into the propeller shaft and fixed through the fixing device. When the device works, the mass block is thrown out by means of inertia and drags the constraint structure to be unfolded, so that the mass distribution is adjusted.
The constraint structure can be composed of a high-strength chain or a rope which is bent or folded, and can ensure that the mass rotates along with the propeller at a specified position without large deviation (the specified position is a mass position which can greatly reduce the vibration of the propeller shaft according to design).
The fixture is a remotely releasable mechanism that deadlocks the mass and the constraining structure.
A vibration compensation device on a propeller blade is used for dealing with an emergency state that the propeller blade is broken. When the propeller is broken in a working state, the propeller generates a great centrifugal force due to mass distribution, so that the propeller shaft generates irregular vibration deviating from the axis, and the safety of the shafting and the propelling performance of the ship are seriously affected. The device can throw out by inertia after discovering that the paddle is damaged to a certain degree, thereby reducing eccentric vibration by adjusting mass distribution.
The device is embedded in the propeller shaft to be fixed when the propeller blades are safe, and consists of a mass block with high density, a constraint structure (the constraint structure can be a hinge, a fiber with high strength and the like) for connecting the mass block and the propeller shaft, and a fixer (the fixer can be a structure which can release the mass block in various modes and can be controlled, such as an electromagnet) of the device, and each device corresponds to one propeller blade to ensure balance. When the device is activated, the mass is no longer fixed and can be thrown out by the inertia of the rotation of the propeller, while the constraint structure is deployed by the mass. And the constraining structure will prevent the mass from deviating from the design position as it advances.
The vibration compensation device has a quite simple structure, can greatly reduce or even prevent series of damages caused by blade fracture, and can be used as a method for ship damage control.
Claims (6)
1. Emergent vibration damper after boats and ships screw paddle is damaged, its structure includes matter piece (3), restraint structure (4), fixing device (8), its characterized in that: the mass block (3) and the constraint structure (4) are fixed on the propeller shaft through the fixing device (8), one end of the constraint structure (4) is connected with the propeller shaft, and the other end of the constraint structure (4) is connected with the mass block (3).
2. The emergency vibration damping device for the damaged propeller blade of the ship according to claim 1, wherein: the constraint structure (4) is composed of chains and ropes with bending or folding functions.
3. The emergency vibration damping device for the damaged propeller blade of the ship according to claim 1, wherein: the fixing device (8) is a device for remote release.
4. The emergency vibration damping device for a damaged propeller blade of a marine vessel according to claim 1 or 3, wherein: the fixing device (8) is an electromagnet.
5. The emergency vibration damping device for the damaged propeller blade of the ship according to claim 1, wherein: the mass block (3) is embedded on the propeller shaft, and the constraint structure (4) and the fixing device (8) are positioned between the mass block (3) and the propeller shaft body.
6. The emergency vibration damping device for a damaged propeller blade of a marine vessel according to claim 1 or 2, wherein: the constraint structure (4) is a hinge or a high-strength fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911020622.XA CN110683027B (en) | 2019-10-25 | 2019-10-25 | Emergency vibration damper after ship propeller blade damage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911020622.XA CN110683027B (en) | 2019-10-25 | 2019-10-25 | Emergency vibration damper after ship propeller blade damage |
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| Publication Number | Publication Date |
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| CN110683027A true CN110683027A (en) | 2020-01-14 |
| CN110683027B CN110683027B (en) | 2022-05-20 |
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| CN201911020622.XA Active CN110683027B (en) | 2019-10-25 | 2019-10-25 | Emergency vibration damper after ship propeller blade damage |
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Citations (16)
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| GB976681A (en) * | 1962-04-20 | 1964-12-02 | Landis Gendron S A | Improvements relating to the compensation of unbalance in rotary machines |
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2019
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| JPS5671688A (en) * | 1979-11-12 | 1981-06-15 | Mitsubishi Heavy Ind Ltd | Repairing method for screw propeller used for ship |
| DK179891D0 (en) * | 1991-10-30 | 1991-10-30 | Gori 1902 As | ELASTOMER PROPELLER WITH FLEXIBLE LEADERS |
| JPH05223140A (en) * | 1992-02-12 | 1993-08-31 | Daihatsu Motor Co Ltd | Vibration control device of power transmission system for automobile |
| US5971859A (en) * | 1993-10-20 | 1999-10-26 | Firma Carl Freudenberg | Vibration canceler which is mountable on shaft with enlargements |
| US5666862A (en) * | 1993-11-26 | 1997-09-16 | Firma Carl Freudenberg | Torsional vibration damper |
| EP1783366A1 (en) * | 2005-11-04 | 2007-05-09 | Daubner & Stommel GbR Bau-Werk-Planung | Wind power plant |
| US20140241879A1 (en) * | 2012-02-24 | 2014-08-28 | Fritz Fahrner | Method and Apparatus for Braking a Wind Turbine in Case of Emergency |
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| CN107244400A (en) * | 2017-06-07 | 2017-10-13 | 哈尔滨工程大学 | A kind of branch type propeller blade |
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| CN110683027B (en) | 2022-05-20 |
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