CN110043596B

CN110043596B - Marine thrust bearing energy dissipation damper and assembling method thereof

Info

Publication number: CN110043596B
Application number: CN201910264890.XA
Authority: CN
Inventors: 温华兵; 张坤; 李阳; 刘伟; 邵传民; 吴逸锋
Original assignee: Jiangsu University of Science and Technology
Current assignee: Jiangsu University of Science and Technology
Priority date: 2019-04-03
Filing date: 2019-04-03
Publication date: 2021-03-02
Anticipated expiration: 2039-04-03
Also published as: CN110043596A

Abstract

The invention discloses a marine thrust bearing energy dissipation damper and an assembling method thereof. The invention utilizes the damping fluid as the energy consumption medium of the damper, and well avoids the rigid collision generated by longitudinal vibration, thereby leading the shafting to be more stable. The thrust bearing has the advantages that modular design and manufacturing are adopted, the structure is compact, the mounting space and the structural load of the thrust bearing are reduced, the thrust bearing is lighter, the manufacturing cost is greatly reduced on the premise of improving the stability, and therefore the thrust bearing is economical and energy-saving and has higher vibration suppression efficiency and higher parameter stability.

Description

Marine thrust bearing energy dissipation damper and assembling method thereof

Technical Field

The invention relates to a marine thrust bearing energy dissipation damper and an assembly method thereof, in particular to a marine thrust bearing energy dissipation damper with a porous damping plate, which is used for dissipating energy of longitudinal vibration of a shafting and belongs to the technical field of vibration reduction of marine shafting.

Background

The ship propulsion shaft system generally comprises a propeller, a stern shaft, an intermediate shaft, a sliding bearing, a thrust shaft, a thrust bearing, an elastic coupling, a speed change device, a diesel engine and the like. The uneven wake field of the ship stern shaft is a direct reason for generating the longitudinal alternating pulsating excitation force at the paddle. The alternating longitudinal force of the propeller usually acts on the hull in two forms, causing the hull to vibrate and underwater radiation noise thereof, one is directly transmitted to the surface of the hull through stern fluid; the other is to transmit the bearing force to the ship body through the ship shafting, the thrust bearing and the base thereof. The bearing force is a main exciting force causing the hull to vibrate and is a main damping control object for the longitudinal vibration of the propulsion shafting.

In order to reasonably avoid power equipment fatigue, abrasion, hull stern vibration and superstructure vibration caused by shafting longitudinal vibration, a series of measures are taken for shafting longitudinal vibration reduction.

The patent of the invention discloses a power vibration absorber of a magnetorheological elastomer thrust bearing base and a using method thereof, wherein the power vibration absorber is arranged on the thrust bearing base and comprises a magnetic yoke group, a magnetism isolating support shaft, a magnetism conducting shaft sleeve, a magnetorheological elastomer and an electromagnetic assembly, the magnetism conducting shaft sleeve is sleeved on the outer layer of the magnetism isolating support shaft, magnetic yoke groups arranged in parallel are respectively arranged at two ends of the magnetism conducting shaft sleeve, the magnetorheological elastomer is arranged at the connection position of the magnetism conducting shaft sleeve and the magnetic yoke group, and at least one electromagnetic assembly is sleeved between the two magnetic yoke groups around the shaft sleeve. However, the structure of the patent is complex, the temperature rise is generated to cause unstable work, the strength of the bearing base is adversely affected by concentrated load, and the generation of a complex electromagnetic field can affect the normal operation of electronic equipment of a ship.

The invention has the application number of CN102269218B, the name is "marine thrust bearing resonance converter", this patent proposes a marine thrust bearing resonance converter, including thrust bearing and resonance converter connected with thrust bearing, the thrust bearing has a plurality of plunger cavities evenly arranged along the circumference in its front end cover, each plunger cavity holds a plunger, one end of the plunger contacts with the front thrust block of the thrust bearing, the other end forms a gap with the corresponding plunger cavity, each plunger cavity gap is communicated with each other and filled with hydraulic oil, form the balance cylinder, the resonance converter is composed of the hydraulic pipe and the cylinder connected with each other, the balance cylinder is connected to the hydraulic pipe through the interface, communicate with the cylinder of the resonance converter, the longitudinal load of the propulsion shafting is transmitted to each plunger contacting with it through the front thrust block, push the plunger to move and act on the load in the balance cylinder and in the resonance converter, vibration reduction is realized. However, the resonance converter needs to be externally connected outside the thrust bearing, not only is the processing and installation difficulty large, but also the actual working environment of the cabin is complex, the factors influencing the safe work of external parts are many, and once an accident happens, the normal operation of the ship can be influenced, so that the engineering application value is limited to a certain extent.

Disclosure of Invention

The invention aims to overcome the technical problems and defects in the prior art and provide a marine thrust bearing energy dissipation damper.

In order to achieve the aim, the technical scheme adopted by the invention for achieving the aim is as follows:

a marine thrust bearing energy dissipation damper comprises a bottom plate, a housing and a stress block, wherein a second sealed working cavity is formed between the bottom plate and the housing, an energy dissipation assembly and damping liquid are filled in the second sealed working cavity, the energy dissipation assembly comprises a first thrust piston, a second thrust piston, a piston cylinder, a thrust connecting rod and a porous damping plate, the piston cylinder is a large stepped piston cylinder and is installed on the bottom plate, the first thrust piston comprises a first piston nested in the large piston cylinder of the piston cylinder and a first piston rod connected with the first piston, the first piston rod penetrates through the bottom plate to be connected with the stress block, the second thrust piston comprises a second piston nested in the small piston cylinder of the piston cylinder and a second piston rod connected with the second piston, and the second piston rod penetrates through a shell of the piston cylinder and is connected with the thrust connecting rod, the other end of the thrust connecting rod is connected with the porous damping plate, the first thrust piston, the second thrust piston and the piston cylinder form a first sealed working cavity, and damping liquid is filled in the first sealed working cavity.

Furthermore, a first reset spring is arranged between the stress block and the bottom plate, the first reset spring is sleeved on the first piston rod, a second reset spring is arranged between the second thrust piston and the piston cylinder, the second reset spring is sleeved on the second piston rod, and the first reset spring and the second reset spring both have certain pretightening force.

Furthermore, the porous damping plate is provided with damping holes, and the aperture ratio of the porous damping plate is 8-15%. The effects of throttling and energy consumption can be better played.

Furthermore, the area of the second piston is 30% -50% of the area of the first piston, a first thrust piston sealing ring is arranged on the first piston, and a second thrust piston sealing ring is arranged on the second piston.

Furthermore, the stress surface of the stress block is an arc surface.

Furthermore, the piston cylinder is connected with the bottom plate through a screw, and a shell sealing ring is arranged between the piston cylinder and the bottom plate. The shell sealing ring plays a certain buffering role when the first thrust piston resets.

Further, a cylinder body sealing ring is arranged between the piston cylinder and the thrust connecting rod. The cylinder body sealing ring plays a certain buffering role when the thrust connecting rod resets.

Furthermore, a filling port is formed in the bottom plate and is plugged through a bottom plate liquid filling hole screw plug, a bottom plate sealing ring is arranged between the bottom plate and the housing, and a filling port is formed in the piston cylinder corresponding to the first sealing working cavity and is plugged through a piston cylinder liquid filling hole screw plug.

The invention also provides an assembly method of the energy dissipation damper for the marine thrust bearing, which comprises the following steps:

firstly, enabling the first piston rod of the first thrust piston to penetrate through the bottom plate, and connecting the first piston rod with the force bearing block;

secondly, the second piston rod of the second thrust piston penetrates through a shell of the cylinder body;

thirdly, connecting the second piston rod with the thrust connecting rod, and installing the porous damping plate on the thrust connecting rod;

fourthly, sleeving the second thrust piston, the piston cylinder, the thrust connecting rod and the piston cylinder of the porous damping plate which are connected into a whole on the first piston of the first thrust piston, and then connecting the piston cylinder with the bottom plate;

fifthly, filling the first sealed working cavity with damping fluid;

sixthly, connecting the housing with the bottom plate;

and seventhly, filling the second sealed working cavity with damping fluid.

Compared with the prior art, the technical scheme of the invention has the following advantages:

1. the damping fluid is used as an energy consumption medium of the damper, so that the rigid collision generated by longitudinal vibration is well avoided, and the shafting is more stable.

2. All the energy consumption components work in the damping liquid, and the damping liquid provides an anti-corrosion environment for the damper, so that the service life is prolonged.

3. Compared with the common single-piston rod type hydraulic cylinder, the multi-fluid damping device is simultaneously provided with two closed independent working chambers, the first thrust piston and the second thrust piston with the diameters decreasing progressively along the vibration transmission direction are simultaneously arranged in the sealed cylinder, the two pistons form a sealed working chamber to extrude damping fluid to consume energy, and simultaneously amplify the force transmitted to the second thrust piston, so that the multi-fluid damping plate can be driven to generate a larger stroke in the other working chamber, more energy exchange is generated between the multi-fluid damping device and the damping fluid, the multi-fluid damping design can dissipate a large amount of mechanical energy transmitted by a shafting, the working efficiency is high, and the working effect is good.

4. The energy-consuming damper adopts modular design and manufacture, has compact structure, compresses the installation space and structural load of the thrust bearing, is lighter, and greatly reduces the manufacturing cost on the premise of improving the stability, thereby being economic and energy-saving, and having higher vibration suppression efficiency and higher parameter stability, thereby having higher engineering application value.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is a schematic diagram of an installation application of the first embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view A-A of FIG. 2;

FIG. 4 is a cross-sectional view of a porous damping plate in an embodiment of the present invention;

in the figure: 1 is a stressed block, 2 is a bottom plate sealing hole, 3 is a bottom plate, 4 is a bottom plate liquid injection hole screw plug, 5 is a bottom plate sealing ring, 6 is a screw, 7 is a first thrust piston, 8 is a first sealing working cavity, 9 is a piston cylinder liquid injection hole screw plug, 10 is a piston cylinder, 11 is a cylinder body sealing hole, 12 is a porous damping plate, 13 is a second sealing working cavity, 14 is a housing, 15 is a connecting screw, and 16 is a damping hole, 17 is a thrust connecting rod, 18 is a cylinder body sealing ring, 19 is a second reset spring, 20 is a second thrust piston sealing ring, 21 is a second thrust piston, 22 is a first thrust piston sealing ring, 23 is a shell sealing ring, 24 is a first reset spring, 25 is a thrust ring, 26 is a bearing thrust block, 27 is a marine thrust bearing energy dissipation damper, 28 is an end cover, 71 is a first piston, 72 is a first piston rod, 211 is a second piston, and 212 is a second piston rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in FIG. 1, a marine thrust bearing dissipative damper comprises a bottom plate 3, a housing 14 and a stressed block 1, wherein a second sealed working chamber 13 is formed between the bottom plate 3 and the housing 14, dissipative components and damping fluid are contained in the second sealed working chamber 13, the dissipative components comprise a first thrust piston 7, a second thrust piston 21, a piston cylinder 10, a thrust connecting rod 17 and a porous damping plate 12, the piston cylinder 10 is a large stepped piston cylinder and is mounted on the bottom plate 3, the first thrust piston 7 comprises a first piston 71 nested in a large piston cylinder of the piston cylinder 10 and a first piston rod 72 connected with the first piston 71, the first piston rod 72 penetrates through the bottom plate 3 to be connected with the stressed block 1, the second thrust piston 21 comprises a second piston 211 nested in a small piston cylinder 10 and a second piston rod 212 connected with the second piston 211, the second piston rod 212 penetrates through the shell of the piston cylinder 10 and is connected with the thrust connecting rod 17, the other end of the thrust connecting rod 17 is connected with the porous damping plate 12, the first thrust piston 7, the second thrust piston 21 and the piston cylinder 10 form a first sealed working cavity 8, and damping fluid is filled in the first sealed working cavity 8.

A first return spring 24 is arranged between the stress block 1 and the bottom plate 3, the first return spring 24 is sleeved on the first piston rod 72, a second return spring 19 is arranged between the second thrust piston 21 and the piston cylinder 10, the second return spring 19 is sleeved on the second piston rod 212, and the first return spring 24 and the second return spring 19 both have certain pretightening force.

As shown in fig. 4, the porous damping plate 12 is provided with damping holes 16, and the porous damping plate 12 has an opening ratio of 8%.

The area of the second piston 211 is 30% of the area of the first piston 71, the first piston 71 is provided with a first thrust piston seal ring 22, and the second piston 211 is provided with a second thrust piston seal ring 20.

The stress surface of the stress block 1 is an arc surface.

The center of the bottom plate 3 is provided with a base sealing hole 2, the first piston rod 72 extends out of the base sealing hole 2 and is in threaded connection with the stress block 1, the piston cylinder 10 is provided with a cylinder body sealing hole 11, the second piston rod 212 extends out of the cylinder body sealing hole 11 and is connected with the thrust connecting rod 17 through threads, and the porous damping plate 12 is installed at the top of the thrust connecting rod 17 and is fixed through a connecting screw 15.

The piston cylinder 10 is connected with the bottom plate 3 through a screw 6, and a shell sealing ring 23 is arranged between the piston cylinder 10 and the bottom plate 3.

And a cylinder body sealing ring 18 is arranged between the piston cylinder 10 and the thrust connecting rod 17.

The bottom plate 3 is provided with a filling port and is plugged by a bottom plate liquid filling hole screw plug 4, a bottom plate sealing ring 5 is arranged between the bottom plate 3 and the housing 14, and the piston cylinder 10 is provided with a filling port corresponding to the first sealing working cavity and is plugged by a piston cylinder liquid filling hole screw plug 9.

The invention discloses an assembling method of a marine thrust bearing energy dissipation damper, which comprises the following steps:

firstly, the first piston rod 72 of the first thrust piston 7 passes through the bottom plate 3, the first return spring 24 is sleeved on the first piston rod 72, and the first piston rod 72 is connected with the force bearing block 1;

secondly, sleeving the second return spring 19 on the second piston rod 212 of the second thrust piston 21, and penetrating the second piston rod 212 through the shell of the cylinder 10;

thirdly, connecting the second piston rod 212 with the thrust connecting rod 17, and installing the porous damping plate 12 on the thrust connecting rod 17;

fourthly, sleeving the second thrust piston 21, the piston cylinder 10, the thrust connecting rod 17 and the piston cylinder 10 of the porous damping plate 12 which are connected into a whole on the first piston 71 of the first thrust piston 7, and then connecting the piston cylinders with the bottom plate 3;

fifthly, filling the first sealed working cavity 8 with damping fluid and plugging the piston cylinder with a liquid injection hole plug screw 9;

sixthly, connecting the cover shell 14 with the bottom plate 3;

and seventhly, filling the second sealed working cavity 13 with damping liquid, and plugging by using the bottom plate liquid injection hole plug screw 4.

Application method and working principle

Application method and working principle of energy dissipation damper for marine thrust bearing

As shown in fig. 2 and 3, a plurality of the dissipative dampers 27 for marine thrust bearings are installed between the thrust bearing of the marine shafting and the end cover 28.

Principle of operation

The marine thrust bearing energy dissipation damper 27 is installed at the thrust bearing, when the shaft system generates longitudinal vibration, the longitudinal vibration is transmitted to the stress block 1 through the thrust ring 25 and the bearing thrust block 26 of the thrust bearing, the stress block 1 pushes the first thrust piston 7 to extrude damping fluid in the first sealed working cavity 8, the damping fluid absorbs mechanical energy after being extruded and converts the mechanical energy into a large amount of heat energy to be dissipated, meanwhile, the second thrust piston 21 is pushed to move, the second return spring 19 is extruded, and the functions of buffering and consuming the mechanical energy are achieved while the system is reset. Second thrust piston 21 drives thrust connecting rod 17 and porous damping plate 12 is being full of the damping fluid equally move in the sealed working chamber 13 of second, work as when porous damping plate 12 moves, the volume of porous damping plate 12 one side diminishes, and pressure risees, forces the damping fluid to pass through damping hole 16 and porous damping plate 12 slit all around flows to the low pressure chamber of opposite side, can produce viscous resistance at the flow in-process, and the damping fluid is for overcoming interior frictional force, turns into kinetic energy into heat energy and transmits for the external world, simultaneously, passes through as the damping fluid can form the vortex and lose the energy during damping hole 16. Since the contact area of the second thrust piston 21 with the damping fluid is only 30% -50% of that of the first thrust piston 7, the second thrust piston 21 will be subjected to a larger force and will produce a larger stroke than the first thrust piston 7, thereby driving the porous damping plate 12 to produce a larger stroke and consume more mechanical energy.

The bearing energy consumption damper 27 is additionally arranged on a longitudinal vibration transmission path of the ship shafting, and mechanical energy transmitted by the shafting is largely dissipated through a multiple fluid damping vibration attenuation link, so that the longitudinal vibration of the shafting is effectively controlled.

The foregoing is only a preferred embodiment of the present invention. The present invention is capable of other embodiments, and various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention. All technical solutions which are formed by adopting equivalent substitutions or equivalent transformations shall fall within the protection scope of the appended claims.

Claims

1. The utility model provides a marine thrust bearing power consumption damper which characterized in that: including bottom plate (3), housing (14) and atress piece (1), bottom plate (3) with form second sealed working chamber (13) between housing (14), be equipped with dissipative component and damping fluid in second sealed working chamber (13), dissipative component includes first thrust piston (7), second thrust piston (21), piston cylinder (10), thrust connecting rod (17) and porous damping plate (12), piston cylinder (10) are big or small ladder piston cylinder, install on bottom plate (3), first thrust piston (7) including the nestification first piston (71) in the big piston cylinder of piston cylinder (10) and with first piston rod (72) that first piston (71) are connected, first piston rod (72) pass bottom plate (3) with atress piece (1) is connected, second thrust piston (21) including the nestification second piston (211) in the little piston cylinder of piston cylinder (10) and with the atress piece (1) is connected, second thrust piston (21) include the nestification second piston (211) in the little piston cylinder of piston cylinder (10) and with The second piston rod (212) is connected with the second piston (211), the second piston rod (212) penetrates through the shell of the piston cylinder (10) and is connected with the thrust connecting rod (17), the other end of the thrust connecting rod (17) is connected with the porous damping plate (12), the first thrust piston (7), the second thrust piston (21) and the piston cylinder (10) form a first sealed working cavity (8), and damping fluid is filled in the first sealed working cavity (8); a first return spring (24) is arranged between the stress block (1) and the bottom plate (3), the first return spring (24) is sleeved on the first piston rod (72), a second return spring (19) is arranged between the second thrust piston (21) and the piston cylinder (10), the second return spring (19) is sleeved on the second piston rod (212), and the first return spring (24) and the second return spring (19) both have certain pretightening force; the porous damping plate (12) is provided with damping holes (16), and the opening rate of the porous damping plate (12) is 8-15%; the area of the second piston (211) is 30% -50% of the area of the first piston (71), a first thrust piston sealing ring (22) is arranged on the first piston (71), and a second thrust piston sealing ring (20) is arranged on the second piston (211).

2. The dissipative damper of a marine thrust bearing according to claim 1, wherein: the stress surface of the stress block (1) is an arc surface.

3. The dissipative damper of a marine thrust bearing according to claim 1, wherein: the piston cylinder (10) is connected with the bottom plate (3) through a screw (6), and a shell sealing ring (23) is arranged between the piston cylinder (10) and the bottom plate (3).

4. The dissipative damper of a marine thrust bearing according to claim 1, wherein: and a cylinder body sealing ring (18) is arranged between the piston cylinder (10) and the thrust connecting rod (17).

5. The dissipative damper of a marine thrust bearing according to claim 1, wherein: the bottom plate (3) is provided with a filling port and is plugged by a bottom plate liquid filling hole screw plug (4), a bottom plate sealing ring (5) is arranged between the bottom plate (3) and the housing (14), and the piston cylinder (10) is provided with a filling port corresponding to the first sealing working cavity (8) and is plugged by a piston cylinder liquid filling hole screw plug (9).

6. The method for assembling the dissipative damper of a marine thrust bearing according to any of claims 1 to 5, comprising the steps of:

firstly, the first piston rod (72) of the first thrust piston (7) penetrates through the bottom plate (3), and the first piston rod (72) is connected with the force-bearing block (1);

secondly, the second piston rod (212) of the second thrust piston (21) penetrates through the shell of the piston cylinder (10);

thirdly, connecting the second piston rod (212) with the thrust connecting rod (17), and installing the porous damping plate (12) on the thrust connecting rod (17);

fourthly, sleeving the piston cylinder (10) of the second thrust piston (21), the piston cylinder (10), the thrust connecting rod (17) and the porous damping plate (12) which are connected into a whole on the first piston (71) of the first thrust piston (7) and then connecting the piston cylinder with the bottom plate (3);

fifthly, filling the first sealed working cavity (8) with damping fluid;

sixthly, connecting the cover shell (14) with the bottom plate (3);

and seventhly, filling the second sealed working cavity (13) with damping fluid.