Additional mass type vibration isolator
By designing an additional mass vibration isolator, the combined design of additional mass, inner piston and outer piston is solved, and the problems of large static displacement and sensitivity to mass changes during low-frequency vibration isolation are achieved, and the equipment's low-frequency vibration isolation and vibration isolator technical parameters are adjusted, with the characteristics of high static stiffness and low maintenance costs.
Patent Information
- Application Number
- CN202510349342.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2025-05-06
AI Technical Summary
Traditional linear vibration isolators require a smaller stiffness value during low-frequency vibration isolation, resulting in a larger static displacement of the equipment and is sensitive to changes in the equipment quality. A smaller increase in mass will cause a larger static displacement.
An additional mass isolator is designed to improve the low-frequency vibration isolation performance of traditional linear isolators through the combined design of additional mass, inner piston and outer piston, and to achieve adjustable vibration isolation frequency and static displacement by adjusting the magnitude of the additional mass.
The low-frequency vibration isolation of the equipment is realized, which reduces the impact of equipment quality changes on static displacement, improves the static stiffness of the vibration isolator, simplifies the manufacturing and installation process, and reduces maintenance costs.
Smart Images
Figure CN119934193A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of vibration reduction and noise reduction of mechanical equipment, in particular to an additional mass type vibration isolator. Background Art
[0002] Low frequency is a development trend of ship vibration isolation devices. For traditional linear vibration isolators, a smaller stiffness value is required to meet the needs of low-frequency vibration isolation. At this time, the equipment installed on it will produce a large static displacement, which is not conducive to the stability requirements of equipment installation.
[0003] Although the existing low-frequency vibration isolation technology solves the problem of large static displacement of low-frequency vibration isolation, this solution is very sensitive to the mass change of the installed equipment. A small increase in mass will cause a large static displacement.
[0004] For this purpose, we propose an added mass vibration isolator. Summary of the invention
[0005] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides an added mass vibration isolator to improve the low-frequency vibration isolation performance of traditional linear vibration isolators and realize low-frequency vibration isolation of equipment; by changing the size of the added mass, technical parameters such as vibration isolation frequency and static displacement can be adjusted, thereby reducing the impact of equipment mass changes on static displacement.
[0006] The technical solution adopted by the present invention is as follows:
[0007] An added mass vibration isolator, comprising:
[0008] An upper mounting plate, the top of which is connected to the vibration-isolated device, a support shaft is provided at the bottom of the upper mounting plate, and an inner piston is provided at the bottom of the support shaft;
[0009] A lower mounting plate, the bottom of which is connected to the base, and the top of which is provided with an inner cavity plate and two outer cavity plates from the inside to the outside;
[0010] Additional mass, the additional mass comprises an additional mass bracket, one end of the additional mass bracket is provided with an outer piston, and the other end of the additional mass bracket is provided with a mass sheet;
[0011] Among them, the inner piston is movably arranged in the inner cavity plate, the outer piston is movably arranged in the two outer cavity plates, a spring is arranged between the upper mounting plate and the lower mounting plate, one end of the spring is connected to the upper mounting plate, and the other end of the spring is connected to the lower mounting plate;
[0012] The space between the inner cavity plate, the lower mounting plate and the inner piston is the inner cavity, and the space between the outer piston, the lower mounting plate and the two outer cavity plates is the outer cavity. The outer cavity and the inner cavity are connected through the cavity connecting channel, and the outer cavity and the inner cavity are filled with flowing liquid.
[0013] It is further characterized by:
[0014] The additional mass is connected to the mass sheet by bolts, and the mass of the additional mass is adjusted by adjusting the number of the mass sheets.
[0015] The liquid filled in the outer cavity and the inner cavity is a viscous liquid.
[0016] The cross-sectional area of the outer cavity is smaller than the cross-sectional area of the inner cavity.
[0017] The quality sheet is a sheet-like structure.
[0018] A limit plate is arranged in the inner cavity plate, the limit plate comprises an upper limit plate with an opening and a lower limit plate with an opening, and the inner piston is arranged between the upper limit plate and the lower limit plate of the limit plate.
[0019] There are two springs, which are spaced apart from each other.
[0020] The beneficial effects of the present invention are as follows:
[0021] The present invention has a compact and reasonable structure and is easy to operate. Through the combined design of additional mass, inner piston and outer piston, the low-frequency vibration isolation performance of traditional linear vibration isolators is improved to achieve low-frequency vibration isolation of equipment. By changing the size of the additional mass, technical parameters such as vibration isolation frequency and static displacement are adjustable, reducing the impact of equipment mass changes on static displacement. By adding a limit plate, the limit function of the vibration isolator is achieved. The present invention has a simple structure, is easy to manufacture and install, and has low maintenance costs. It can achieve low-frequency vibration isolation of equipment, and the technical parameters of the vibration isolator are adjustable, with high static stiffness and small static displacement due to equipment mass changes. The device can be used for low-frequency vibration isolation of precision instruments, low-frequency vibration isolation of high-rise buildings, and low-frequency vibration isolation of mechanical equipment such as motors. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of the present invention.
[0023] Figure 2 for Figure 1 main view.
[0024] Figure 3 for Figure 2 Top view of the .
[0025] Figure 4 for Figure 3 Schematic diagram of the AA section.
[0026] Figure 5 for Figure 3 Schematic diagram of the BB section.
[0027] Figure 6 It is a schematic diagram of the additional mass of the present invention.
[0028] Among them: 1. upper mounting plate; 2. outer cavity plate; 3. lower mounting plate; 4. spring; 5. support shaft; 501. inner piston; 6. limit plate; 7. outer cavity; 8. inner cavity plate; 9. inner cavity; 10. additional mass; 1001. outer piston; 1002. additional mass bracket; 1003. mass sheet; 1004. bolt; 11. cavity connecting channel. DETAILED DESCRIPTION
[0029] The specific implementation of the present invention is described below in conjunction with the accompanying drawings.
[0030] like Figure 1-Figure 6 As shown, an added mass type vibration isolator includes an upper mounting plate 1, an outer cavity plate 2, a lower mounting plate 3, a spring 4, a support shaft 5, a limit plate 6, an outer cavity 7, an inner cavity plate 8, an inner cavity 9, an added mass 10 and a cavity connecting channel 11.
[0031] The vibration-isolated device is mounted on the vibration isolator via an upper mounting plate 1 , and the vibration isolator is mounted on the foundation via a lower mounting plate 3 .
[0032] The spring 4 is arranged between the upper mounting plate 1 and the lower mounting plate 3, one end of the spring 4 is connected to the upper mounting plate 1, and the other end of the spring 4 is connected to the lower mounting plate 3, and the spring 4 provides support stiffness for the vibration-isolated device.
[0033] In one embodiment, two springs 4 are provided, and the two springs 4 are spaced apart from each other.
[0034] The outer cavity plate 2 is arranged on the top of the lower mounting plate 3, and the inner cavity plate 8 is arranged on the inner side of the outer cavity plate 2 of the lower mounting plate 3, and the inner cavity plate 8 is provided with a limit plate 6, and the limit plate 6 includes an upper limit plate with a hole and a lower limit plate with a hole; the upper mounting plate 1 is provided with a support shaft 5 at the bottom, and the inner piston 501 is arranged at the bottom of the support shaft 5, and the inner piston 501 is located in the inner cavity plate 8, and the inner piston 501 is arranged between the upper limit plate and the lower limit plate of the limit plate 6; the inner piston 501 can reciprocate between the upper limit plate and the lower limit plate of the limit plate 6. The limit plate 6 limits the range of motion of the inner piston 501 and plays a role of limiting.
[0035] Two outer cavity plates 2 are provided.
[0036] The space between the inner cavity plate 8, the lower mounting plate 3 and the inner piston 501 is the inner cavity 9. The additional mass 10 comprises an outer piston 1001, an additional mass bracket 1002, a mass sheet 1003 and a bolt 1004. One end of the additional mass bracket 1002 is connected to the outer piston 1001, the outer piston 1001 is arranged between the two outer cavity plates 2, the additional mass bracket 1002 is provided with a mass sheet 1003, and the mass sheet 1003 is connected to the additional mass bracket 1002 by a bolt 1004.
[0037] The mass sheet 1003 and the additional mass bracket 1002 may also be connected via other structures.
[0038] The space between the outer piston 1001, the lower mounting plate 3 and the two outer cavity plates 2 is the outer cavity 7. The outer cavity 7 is connected to the inner cavity 9 through a cavity connecting channel 11. The outer cavity 7 and the inner cavity 9 are filled with flowing liquid.
[0039] In one embodiment, the liquid may be a viscous liquid, which may improve the damping of the vibration isolator.
[0040] In one embodiment, the cross-sectional area of the outer cavity 7 is smaller than the cross-sectional area of the inner cavity 9, which can achieve a better vibration isolation effect.
[0041] In one embodiment, the mass sheet 1003 is a sheet-like structure, and the mass of the additional mass 10 is adjusted by increasing or decreasing the number of the mass sheets 1003 .
[0042] For vertically mounted equipment, the static displacement of the isolator
[0043] Natural frequency
[0044] Where M is the mass of the equipment to be isolated, M0 is the mass of the additional mass 10, G is the acceleration of gravity, K is the stiffness of the spring 4, and A is 内腔 is the horizontal cross-sectional area of the inner cavity 9, A 外腔 is the horizontal cross-sectional area of the outer cavity 7.
[0045] The vibration isolator in the present application can reduce the static displacement of the equipment installation. When M=M0α, the static displacement is 0, thereby improving the low-frequency vibration isolation performance of the vibration isolator.
[0046] In one embodiment, the mass of the vertically mounted device is 100 kg, that is, the mass of the device to be isolated is 100 kg, and the effective isolation starting frequency is required to be 2.83 Hz. The parameters of the conventional linear isolator and the isolator in this application are as follows:
[0047]
[0048] While meeting the low-frequency design requirements, the static stiffness of the vibration isolator is improved, and the impact of equipment mass changes on the static deformation of the vibration isolator is reduced.
[0049] Through the joint design of the additional mass 10, the inner piston 501 and the outer piston 1001, the low-frequency vibration isolation performance of the traditional linear vibration isolator is improved, and the low-frequency vibration isolation of the equipment is achieved; by changing the size of the additional mass 10, the technical parameters such as the vibration isolation frequency and static displacement are adjustable, and the influence of the equipment mass change on the static displacement is reduced; by adding the limit plate 6, the limit function of the vibration isolator is achieved. The present invention has a simple structure, is easy to manufacture and install, and has a low maintenance cost. It can achieve low-frequency vibration isolation of equipment, and the technical parameters of the vibration isolator are adjustable, with high static stiffness and the characteristics of small static displacement due to equipment mass change. The device can be used for low-frequency vibration isolation of precision instruments, low-frequency vibration isolation of high-rise buildings, and low-frequency vibration isolation of mechanical equipment such as motors.
[0050] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.
Claims
1. An added mass vibration isolator, characterized in that: include: An upper mounting plate (1), the top of which is connected to the vibration-isolated device, a support shaft (5) is disposed at the bottom of the upper mounting plate (1), and an inner piston (501) is disposed at the bottom of the support shaft (5); A lower mounting plate (3), the bottom of which is connected to the base, and the top of the lower mounting plate (3) is provided with an inner cavity plate (8) and two outer cavity plates (2) from the inside to the outside; An additional mass (10), the additional mass (10) comprising an additional mass bracket (1002), an outer piston (1001) being arranged at one end of the additional mass bracket (1002), and a mass sheet (1003) being arranged at the other end of the additional mass bracket (1002); The inner piston (501) is movably arranged in the inner cavity plate (8), the outer piston (1001) is movably arranged in the two outer cavity plates (2), a spring (4) is arranged between the upper mounting plate (1) and the lower mounting plate (3), one end of the spring (4) is connected to the upper mounting plate (1), and the other end of the spring (4) is connected to the lower mounting plate (3); The space between the inner cavity plate (8), the lower mounting plate (3) and the inner piston (501) is the inner cavity (9); the space between the outer piston (1001), the lower mounting plate (3) and the two outer cavity plates (2) is the outer cavity (7); the outer cavity (7) and the inner cavity (9) are connected via a cavity connecting channel (11); and the outer cavity (7) and the inner cavity (9) are filled with a flowing liquid.
2. The added mass vibration isolator according to claim 1, characterized in that: The additional mass (10) is connected to the mass piece (1003) via bolts (1004), and the mass of the additional mass (10) is adjusted by adjusting the number of the mass pieces (1003).
3. The added mass vibration isolator according to claim 1, characterized in that: The liquid filled in the outer cavity (7) and the inner cavity (9) is a viscous liquid.
4. The added mass vibration isolator according to claim 3, characterized in that: The cross-sectional area of the outer cavity (7) is smaller than the cross-sectional area of the inner cavity (9).
5. The added mass vibration isolator according to claim 2, characterized in that: The quality sheet (1003) is a sheet-like structure.
6. The added mass vibration isolator according to claim 1, characterized in that: A limit plate (6) is arranged in the inner cavity plate (8), the limit plate (6) comprises an upper limit plate with a hole and a lower limit plate with a hole, and the inner piston (501) is arranged between the upper limit plate and the lower limit plate of the limit plate (6).
7. The added mass vibration isolator according to claim 1, characterized in that: Two springs (4) are provided, and the two springs (4) are arranged at an interval.