An adjustable power absorber

Abstract

The application sets air damping structure in the adjustable power vibration absorber, the air damping structure comprises a damping cylinder, a plurality of air damping holes are arranged at two ends of the damping cylinder, a damping adjusting sleeve is sleeved outside the damping cylinder, the damping adjusting sleeve can cover the air damping holes when moving on the damping cylinder, when the working condition or load of the main vibration system changes, the number of the air damping holes is controlled by moving the damping adjusting sleeve, so as to adjust the air damping of the power vibration absorber; the application also discloses a mass structure comprising a plurality of layers, the vibration absorbing particles are filled in each cavity, the vibration absorbing particles are rubbed and collided to the maximum extent when vibrating, so that the vibration absorbing efficiency is improved, the adjustable power vibration absorber is simple in structure, convenient to operate and low in manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of ship vibration absorption, and in particular to an adjustable dynamic vibration absorber. Background Technology

[0002] Vibration phenomena in ship structures and related equipment have become a prominent issue and have received widespread attention. Numerous factors contribute to this phenomenon, including wave loads during navigation, the operation of the ship's propulsion machinery, and auxiliary equipment. In particular, the frames of some large main engines or compressors, for example, can experience significant lateral vibrations under tilting moments, potentially leading to frame damage and causing incalculable adverse effects.

[0003] Currently, the main method for controlling lateral vibration on ships is to install lateral supports at critical points in equipment or structures. However, in actual use, support breakage has occurred repeatedly, leading to increased vibration. Existing technologies also utilize dynamic vibration absorbers to absorb the vibration energy of the main vibration system. However, the damping system of traditional vibration absorbers is a fixed value, and the damping coefficient cannot be adjusted when the operating conditions of the equipment change. Therefore, the vibration absorption effect of traditional dynamic vibration absorbers is not ideal. Summary of the Invention

[0004] In view of the deficiencies in the prior art, this application provides an adjustable dynamic vibration absorber to solve the technical problem that the vibration absorption effect of the existing dynamic vibration absorber is not ideal.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adjustable dynamic vibration absorber, comprising a mass structure, an air damping structure, and a base structure;

[0006] The air damping structure is fixedly connected to the main vibration system via the base structure. The air damping structure includes a damping adjustment sleeve and a damping cylinder. The damping cylinder is horizontally positioned, with one end fixedly connected to the base structure. The end of the damping cylinder fixedly connected to the base structure is defined as the first end, and the other end of the damping cylinder as the second end. An end cap is sealed to the second end of the damping cylinder. A piston plate, which is in a sliding fit with the inner wall of the damping cylinder, is disposed inside the damping cylinder. The side of the piston plate away from the main vibration system is fixed to one end of a piston rod. The piston rod is connected in a sealed manner, with the other end passing through the end cap and fixedly connected to the mass structure. A spring is sleeved on the piston rod, with one end of the spring fixedly connected to the piston plate and the other end of the spring fixed to the end cap. The damping cylinder has multiple air damping holes on its wall, with more air damping holes near the first end than near the second end. A damping adjustment sleeve is sleeved on the outside of the damping cylinder, and the damping adjustment sleeve can cover the air damping holes on the first end when it moves on the damping cylinder.

[0007] The mass structure is slidably mounted on the base structure along the axial direction of the piston rod.

[0008] In one embodiment, the outer wall of the damping cylinder is provided with external threads, the inner wall of the damping adjusting sleeve is provided with internal threads, and the damping adjusting sleeve is threadedly connected to the damping cylinder.

[0009] In one embodiment, the air damping structure further includes a vibration isolation block, which includes a plate and a cylindrical end disposed on one side of the plate. The cylindrical end is inserted into the damping cylinder and in close contact with the inner wall of the damping cylinder, and is fixedly connected to the damping cylinder. The vibration isolation block is fixedly connected to the base structure through the plate.

[0010] In one embodiment, the base structure is L-shaped, the vertical portion of the base structure is fixedly connected to the damping cylinder, and a guide rail is fixedly provided on the horizontal portion of the base structure, with the mass structure slidably connected to the guide rail.

[0011] In one embodiment, the lower end of the mass structure is connected to the guide rail using a tenon and mortise joint.

[0012] In one embodiment, the mass structure includes a mass container filled with vibration-absorbing particles.

[0013] In one embodiment, the mass container has a multi-layer structure, with each cavity filled with the vibration-absorbing particles.

[0014] In one embodiment, the mass container has a double-layer structure, with a support plate welded to the middle of the inner walls on both sides of the mass container. A partition is placed on the support plate, and the partition is fixedly connected to the support plate by fastening bolts. The partition is in seamless contact with the inner wall of the mass container.

[0015] In one embodiment, the vibration-absorbing particles are fine sand.

[0016] In one embodiment, the filling rate of the vibration-absorbing particles within the mass container is 50%-70%.

[0017] Compared with the prior art, the beneficial effects of this application are as follows:

[0018] This invention incorporates an air damping structure in an adjustable dynamic vibration absorber. The air damping structure includes a damping cylinder with multiple air damping holes at both ends. A damping adjustment sleeve is fitted over the damping cylinder, covering the air damping holes as it moves across the cylinder. When the operating conditions or load of the main vibration system change, the number of air-permeable holes is controlled by moving the damping adjustment sleeve, thereby adjusting the air damping of the dynamic vibration absorber. This application also discloses a multi-layered mass structure, with each cavity filled with vibration-absorbing particles. This maximizes friction and collision between the particles during vibration, thereby improving vibration absorption efficiency. The adjustable dynamic vibration absorber in this application has a simple structure, is easy to operate, and has low manufacturing costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the adjustable dynamic vibration absorber in the embodiments of this application;

[0021] Figure 2 for Figure 1 AA diagram;

[0022] Figure 3 for Figure 1 Diagram of BB in the middle;

[0023] Figure 4 This is a schematic diagram of the outer surface of the external thread damping cylinder in an embodiment of this application. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] like Figure 1-4 As shown, this embodiment discloses an adjustable dynamic vibration absorber, including a mass structure 1, an air damping structure 2, and a base structure 3;

[0027] The air damping structure 2 is fixedly connected to the main vibration system via the base structure 3. The air damping structure 2 includes a damping adjustment sleeve 205 and a damping cylinder 206. The damping cylinder 206 is horizontally positioned, with one end fixedly connected to the base structure 3. The end of the damping cylinder 206 fixedly connected to the base structure 3 is defined as the first end, and the other end of the damping cylinder 206 is defined as the second end. The second end of the damping cylinder 206 is sealed with an end cap, and a piston plate 209 is provided inside the damping cylinder 206, which is in a sealing and sliding fit with the inner wall of the damping cylinder 206. One end of the piston rod 208 is fixedly connected to the piston plate 209, and the other end of the piston rod 208 is sealed and fixedly connected to the mass structure 1 through the end cap. A spring 207 is sleeved on the piston rod 208. One end of the spring 207 is fixedly connected to the piston plate 209, and the other end of the spring 207 is fixed to the end cap. Multiple air damping holes 204 are provided on the wall of the damping cylinder 206. The number of air damping holes 204 near the first end of the damping cylinder 206 is greater than the number of air damping holes 204 near the second end. Figure 1 , 2 As shown, a damping adjustment sleeve 205 is fitted outside the damping cylinder 206. When the damping adjustment sleeve 205 moves on the damping cylinder 206, it can cover the air damping hole 204 on the first end side.

[0028] In this embodiment, the piston plate 209 divides the damping cylinder 206 into left and right cavities. When the main vibration system vibrates laterally, under the action of the spring 207, the piston plate 209 reciprocates laterally within the damping cylinder 206, causing the volumes of the left and right cavities to continuously change. Air continuously flows through the air damping holes 204, thereby generating air damping. When the operating conditions or load of the main vibration system change, the number of air damping holes 204 on the first end side is controlled by moving the damping adjusting sleeve 205 to adjust the air damping. As the number of air damping holes 204 covered by the damping adjusting sleeve 205 increases, the air damping gradually increases. The main vibration system can be a ship or mechanical equipment on a ship. To facilitate the replacement of mass structures 1 with different masses, the piston rod 208 is threadedly connected to the mass structure 1.

[0029] like Figure 4As shown, in this embodiment, in order to accurately cover the air damping holes 204, the outer wall of the damping cylinder 206 is provided with external threads, and the inner wall of the damping adjusting sleeve 205 is provided with internal threads. The damping adjusting sleeve 205 is threadedly connected to the damping cylinder 206. Four rows of air damping holes are axially arranged on the first end side of the damping cylinder 206, and two rows of air damping holes 204 are axially arranged on the second end side of the damping cylinder 206. Each row of air damping holes contains four air damping holes, and each air damping hole is spaced 90° apart along the circumference of the damping cylinder 206.

[0030] To better secure the air damping structure 2 and improve vibration absorption, the air damping structure 2 also includes a fixing bolt 201, a pin 202, and a vibration isolation block 203. The vibration isolation block 203 includes a plate and a cylindrical end on one side of the plate. The cylindrical end can be inserted into the damping cylinder 206 and make close contact with the inner wall of the damping cylinder 206. The cylindrical end is provided with a through hole 1 in the radial direction. The damping cylinder 206 is provided with a through hole 2 in the radial direction corresponding to the position of the through hole. The pin 202 passes through the through hole 1 and the through hole 2 to fix the vibration isolation block 203 and the damping cylinder 206. The plate of the vibration isolation block 203 is connected to the base structure 3 by the fixing bolt 201 and can be further connected to the main vibration system with the help of the fixing bolt 201. The vibration isolation block 203 can absorb the collision impact on the base structure 3 when the dynamic vibration absorber is working, thereby enhancing the structural stability of the dynamic vibration absorber.

[0031] To ensure the lateral movement trajectory of mass structure 1, base structure 3 is L-shaped. The vertical part of base structure 3 is fixedly connected to damping cylinder 206, and the horizontal part of base structure 3 is connected to the main vibration system via fixing bolt 304. A guide rail 301 is provided on the horizontal part of base structure 3, allowing mass structure 1 to perform lateral reciprocating motion along the guide rail. To limit the vertical displacement of mass structure 1, such as... Figure 3 As shown, the guide rail 301 is a mortise and tenon joint type track, and the lower end of the mass structure 1 is connected to the guide rail 301 using a mortise and tenon structure. In this embodiment, the guide rail 301 is fixed to the horizontal part 303 of the base structure 3 by epoxy putty 302.

[0032] like Figure 1As shown, the mass structure 1 includes a mass container 101, which is filled with vibration-absorbing particles 105. When the mass structure 1 reciprocates or vibrates, the collisions, friction, momentum exchange, and plastic deformation of the tiny particles within the mass container 105 consume the energy of the vibration system, increasing the damping of the dynamic vibration absorber and causing the vibration velocity to decay rapidly or the amplitude to decrease at resonance. The damping of the dynamic vibration absorber can be adjusted by changing the mass of the vibration-absorbing particles 105 within the mass container 1. To maximize the friction and collision between the vibration-absorbing particles 105 during vibration, thereby improving the vibration absorption efficiency, the mass container 101 adopts a multi-layer structure, with each layer cavity filled with vibration-absorbing particles 105. In this embodiment, the mass container 101 has a double-layer structure. A support plate 103 is welded to the middle of the inner wall on both sides of the mass container 101. A partition plate 102 is placed on the support plate 103. The partition plate 102 is fixedly connected to the support plate 103 by fastening bolts 104. The partition plate 102 is in seamless contact with the inner wall of the mass container 101 to prevent the upper vibration-absorbing particles 105 from leaking to the lower layer during vibration.

[0033] In this embodiment, to reduce costs, the vibration-absorbing particles 105 are fine sand. However, the vibration-damping particles that can be used in this invention are not limited to fine sand steel balls. Other particles that can collide and rub against each other to absorb vibration energy and achieve a vibration-damping effect, such as particles of various suitable shapes made of steel, iron, lead, aluminum, tungsten alloys, glass, etc., can all be used in this invention. The filling rate of each layer of vibration-absorbing particles 105 in the mass container 101 should be suitable for the vibration-absorbing particles to collide and rub against each other in each layer. The filling rate of vibration-absorbing particles 105 in each layer can account for 50%-70% of the volume of each layer. In this embodiment, the vibration-absorbing particles 105 in each layer account for about 60% of the volume of each layer.

[0034] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An adjustable dynamic vibration absorber, characterized in that, This includes the mass structure, air damping structure, and base structure; The air damping structure is fixedly connected to the main vibration system via the base structure. The air damping structure includes a damping adjustment sleeve and a damping cylinder. The damping cylinder is horizontally positioned, with one end fixedly connected to the base structure. The end of the damping cylinder fixedly connected to the base structure is defined as the first end, and the other end of the damping cylinder as the second end. An end cap is sealed to the second end of the damping cylinder. A piston plate, which is in a sealing sliding fit with the inner wall of the damping cylinder, is disposed inside the damping cylinder. The side of the piston plate away from the main vibration system is fixedly connected to one end of a piston rod. The other end of the piston rod passes through the end cap and is fixedly connected to the mass structure. A fixed connection is provided. A spring is sleeved on the piston rod. One end of the spring is fixedly connected to the piston plate, and the other end of the spring is fixed to the end cap. The damping cylinder has multiple air damping holes on its wall. The damping cylinder has more air damping holes near the first end than near the second end. A damping adjustment sleeve is sleeved on the outside of the damping cylinder. When the damping adjustment sleeve moves on the damping cylinder, it can cover the air damping holes on the first end. The outer wall of the damping cylinder has external threads, and the inner wall of the damping adjustment sleeve has internal threads. The damping adjustment sleeve is threadedly connected to the damping cylinder. The mass structure is slidably mounted on the base structure along the axial direction of the piston rod.

2. The adjustable dynamic vibration absorber according to claim 1, characterized in that, The air damping structure also includes a vibration isolation block, which includes a plate and a cylindrical end disposed on one side of the plate. The cylindrical end is inserted into the damping cylinder and in close contact with the inner wall of the damping cylinder, and is fixedly connected to the damping cylinder. The vibration isolation block is fixedly connected to the base structure through the plate.

3. The adjustable dynamic vibration absorber according to claim 1, characterized in that, The base structure is L-shaped. The vertical part of the base structure is fixedly connected to the damping cylinder, and a guide rail is fixedly installed on the horizontal part of the base structure. The mass structure is slidably connected to the guide rail.

4. The adjustable dynamic vibration absorber according to claim 3, characterized in that, The lower end of the mass structure is connected to the guide rail using a mortise and tenon joint.

5. The adjustable dynamic vibration absorber according to claim 1, characterized in that, The mass structure includes a mass container filled with vibration-absorbing particles.

6. The adjustable dynamic vibration absorber according to claim 5, characterized in that, The mass container has a multi-layer structure, and each cavity is filled with the vibration-absorbing particles.

7. The adjustable dynamic vibration absorber according to claim 6, characterized in that, The mass container has a double-layer structure. A support plate is welded to the middle of the inner walls on both sides of the mass container. A partition is placed on the support plate. The partition is fixedly connected to the support plate by fastening bolts. The partition is in seamless contact with the inner wall of the mass container.

8. The adjustable dynamic vibration absorber according to claim 5, characterized in that, The vibration-absorbing particles are fine sand.

9. The adjustable dynamic vibration absorber according to claim 5, characterized in that, The filling rate of the vibration-absorbing particles in the mass container is 50%-70%.

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