Composite double-layer air spring low-frequency vibration isolation device
By using a composite double-layer air spring structure and a throttling tube connection design, the problem of poor low-frequency vibration isolation effect of traditional vibration isolation devices is solved, and effective isolation of vibrations near 1.0HZ and stability of the upper structure are achieved.
Patent Information
- Application Number
- CN202511777181.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-02-10
AI Technical Summary
Existing technologies are insufficient to effectively isolate vibrations around 1.0 Hz. Traditional vibration isolation devices cannot provide sufficient stiffness support when stiffness is reduced, resulting in poor low-frequency vibration isolation performance.
A composite double-layer air spring structure is adopted, which is connected by a throttle tube between the main air spring and the auxiliary air spring. Combined with the limit device and connecting rod design, a double-layer air spring system is formed to enhance the low-frequency vibration isolation effect.
It effectively isolates vibrations around 1.0 Hz, improves the low-frequency vibration isolation performance of the vibration isolation device, and maintains the stability and balance of the superstructure.
Smart Images
Figure CN121497764A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vibration isolation device technology, and in particular to a composite double-layer air spring low-frequency vibration isolation device. Background Technology
[0002] Vibration is ubiquitous; all buildings contain various types of noise, such as people walking, elevator movement, surrounding vehicles, subway operation, and indoor air conditioning. These vibrations are transmitted throughout the building via columns and floors. For precision optical instruments and equipment, it is often necessary to reduce environmental vibration, providing a reliable low-frequency micro-vibration isolation system for large, ultra-precision instruments, and ensuring good stability and excellent frequencies away from the environment.
[0003] Traditional vibration isolation technology Vibration isolators with a load frequency that doubles the natural frequency have good vibration isolation effects. The natural frequency of the damper can be lowered by increasing its mass or reducing its stiffness. However, for vertical vibration isolation, sufficient stiffness is required to support the superstructure, so reducing stiffness is not feasible. Rubber air springs with auxiliary air chambers can achieve vibration isolation by adjusting the gas in the main and auxiliary air chambers, typically isolating frequencies above 2.0 Hz. However, they are not very effective at isolating vibrations around 1.0 Hz. Summary of the Invention
[0004] The purpose of this invention is to provide a composite double-layer air spring low-frequency vibration isolation device, which can solve the problems existing in the prior art; This invention provides a composite double-layer air spring low-frequency vibration isolation device, which includes a main air spring, an outer cylindrical steel support, a middle support steel plate, a limiting device, an inner cylindrical steel support, a load mounting platform, an additional air spring, a lower support steel plate, an upper support steel plate, and a throttling pipe; The upper support steel plate and the lower support steel plate are respectively installed at the upper end and the lower end of the outer cylindrical support; A limiting device is provided on the inner side of the outer cylindrical steel support, and the intermediate support steel plate is connected to the limiting device by a spring. The main air spring is positioned between the lower support steel plate and the middle support steel plate; The additional air spring is disposed between the upper support steel plate and the middle support steel plate; The main air spring and the auxiliary air spring are connected by a throttle tube; The intermediate support steel plate is connected to the inner cylindrical steel support, and a load-bearing installation platform is set on the inner cylindrical steel support.
[0005] Preferably, the intermediate support steel plate has multiple evenly distributed auxiliary air springs, each of which is connected to the main air spring through a throttle tube.
[0006] Preferably, one end of the throttle tube is connected to the bottom of the main air spring, and the other end of the throttle tube is connected to the top of the auxiliary air spring.
[0007] Preferably, the intermediate support steel plate is provided with four evenly distributed additional air springs.
[0008] Preferably, the limiting device includes an upper limiting device and a lower limiting device, the intermediate support steel plate is disposed between the upper limiting device and the lower limiting device, and springs are provided between the intermediate support steel plate and the upper limiting device and the lower limiting device.
[0009] Preferably, the additional air spring is connected to the upper support steel plate via an adjusting nut.
[0010] Preferably, the upper support steel plate is provided with a through hole, and the inner cylindrical steel support extends to the outside of the upper support steel plate after passing through the through hole.
[0011] Preferably, the lower support steel plate is provided with a groove, and a sliding piston is provided in the groove; The outer cylindrical steel support, the intermediate support steel plate, and the piston are connected by a connecting rod.
[0012] Preferably, the outer cylindrical steel support, the intermediate support steel plate, and the piston are all hinged to the connecting rod.
[0013] Beneficial effects: The main air spring is located between the lower support steel plate and the middle support steel plate, and the auxiliary air spring is located between the upper support steel plate and the middle support steel plate. The main air spring and the auxiliary air spring are connected by a throttle tube. The above structure forms a double-layer air spring, which has a better effect on low-frequency vibration isolation. Attached Figure Description
[0014] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0015] Figure 1 Elevation view of the composite double-layer air spring low-frequency vibration isolation device provided for a specific embodiment of the present invention; Figure 2 A plan view of the composite double-layer air spring low-frequency vibration isolation device provided for a specific embodiment of the present invention; Figure 3 A schematic diagram of the connecting rod provided for a specific embodiment of the present invention.
[0016] Explanation of reference numerals in the attached figures: 1-Main air spring; 2-Outer cylindrical steel support; 3-Intermediate support steel plate; 4-Limiting device; 5-Inner cylindrical steel support; 6-Load mounting platform; 7-Additional air spring; 8-Lower support steel plate; 9-Upper support steel plate; 10-Throttle tube; 11-Spring; 12-Adjusting nut; 13-Connecting rod; 14-Sliding piston. Detailed Implementation
[0017] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.
[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0020] like Figure 1 , Figure 2As shown, in this embodiment, a composite double-layer air spring low-frequency vibration isolation device is provided, which includes a main air spring 1, an outer cylindrical steel support 2, an intermediate support steel plate 3, a limiting device 4, an inner cylindrical steel support 5, a load mounting platform 6, an additional air spring 7, a lower support steel plate 8, an upper support steel plate 9, a throttle tube 10, a spring 11, an adjusting nut 12, a connecting rod 13, and a sliding piston 14.
[0021] The upper support steel plate 9, the lower support steel plate 8, and the outer cylindrical support 2 are integrated into one unit. The main air spring 1 is installed on the lower support steel plate 8, and the two are completely fixed together.
[0022] The main air spring 1 is connected to the middle support steel plate 3 above, and the middle support steel plate 3 is connected to the inner cylindrical steel support 5. The load installation platform 6 is on top.
[0023] Four additional air springs 7 are evenly distributed on the four corners of the intermediate support steel plate 3 and are fixed together. The upper surface of the additional air springs 7 is connected to the upper support steel plate 9 through adjusting nuts 12. The distance between the upper support steel plate 9 and the additional air springs 7 is adjusted by adjusting nuts 12.
[0024] A limiting device 4 is installed inside the outer cylindrical steel support, and an intermediate support steel plate 3 is located between the limiting devices 4. A low-stiffness spring 11 is installed between the limiting devices 4 and the intermediate support steel plate 3.
[0025] The bottom of the main air spring 1 is connected to the top of the four auxiliary air springs 7 via a throttle tube 10. The intermediate support steel plate 3 is limited by the limiting device 4 and the spring 11.
[0026] The throttling tube inlet is located at the main air spring 1 and the auxiliary air spring 7. The pressure difference between these two locations is the greatest, which can increase the fluid velocity and damping in the throttling tube.
[0027] The linkage design allows the main air chamber to better maintain pressure balance under external loads.
[0028] The sliding piston 14 is located in the groove at the bottom of the lower support steel plate 8, as shown in the reference. Figure 3 The connecting rod 13 is hinged to the outer cylindrical steel support 2 at point A, to the intermediate support steel plate 3 at position B, to the sliding piston 14 at position D, and to the connecting rod 13 at position C.
[0029] The distance from A to B is The radius of the arc BC is The radius of the sliding piston 14 is , Z is the vertical displacement of the outer cylindrical steel support 2, and Z is the vertical displacement of the intermediate support steel plate 3. The displacement of the slider 14 is obtained from the connecting rod 13.
[0030] The area of slider 14 is
[0031] The pressure change relationship in the main air chamber is as follows:
[0032] Current pressure in the main air chamber Initial pressure of main air chamber, specific heat capacity , Gas density, Main air chamber volume, The rate of change of the main air chamber volume. Z represents the vertical displacement of the outer cylindrical steel support 2, and Z represents the vertical displacement of the intermediate support steel plate 3. It's traffic.
[0033] From the above relationship, it can be seen that when relative motion When positive, it indicates that the main air chamber is compressed and there is no slider. As the denominator increases, the increased force will be transmitted to the upper structure, and at this time... The space can be increased by moving the slider, thereby reducing the space required. The increase of [something] can thus achieve the purpose of vibration isolation.
[0034] The pressure change relationship of the additional airbag is as follows:
[0035] Current pressure in the auxiliary air chamber Initial pressure of the auxiliary gas chamber, specific heat capacity , Gas density, Additional air chamber volume, This is the rate of change of the volume of the additional air chamber.
[0036] Throttling tube model If the gas density in the throttling device is considered to be a constant value, then the flow rate of the throttling tube can be expressed as:
[0037] in
[0038]
[0039] It is the diameter of the throttling tube. It is the length of the throttling tube. It is the friction coefficient of the throttling tube. It is the damping coefficient of the throttling tube. It is the pressure drop in the throttling tube. The cross-sectional area of the throttling tube is... This represents the gas density inside the throttling tube.
[0040] Throttling tubes can provide energy dissipation and damping effects.
[0041]
[0042] in The pressure in the main air chamber, The initial pressure in the main air chamber. This is the standard atmospheric pressure. It is the effective area of the main air chamber. The initial effective area of the main air chamber. It refers to the mass of the intermediate support steel plate 3. This refers to the pressure in the additional air chamber. It is the effective area of the auxiliary air chamber. This is the initial effective area of the additional air chamber.
[0043]
[0044] Working principle: When the environment vibrates, the external load first acts on the lower support steel plate 8 and is transmitted to the upper support steel plate 9 through the outer cylindrical steel support 2. The lower support steel plate 8 moves upward, at which time the main air spring 1 is compressed upward, while the four auxiliary air springs 7 are stretched upward. A pressure difference is formed between the main air spring and the auxiliary air springs. Therefore, the gas in the main air spring will flow into the auxiliary air springs through the throttling pipe, thereby reducing the pressure increase in the main air spring due to the external load and stabilizing the intermediate support steel plate 3 and the vibration-isolated mass. Similarly, when the external load acts on the lower support steel plate 8 and moves downward, the pressure of the main air spring 1 decreases due to the downward stretching, while the pressure of the four auxiliary air springs 7 increases due to the downward compression. A pressure difference is formed between the main air spring and the auxiliary air springs, and the air in the auxiliary air springs flows into the main air spring through the throttling orifice. At the same time, when the outer cylindrical steel support 2 moves upward relative to the middle support steel plate 3, the connecting rod 13 will drive the sliding piston 14 to move downward. In this way, the space of the main air spring 1 increases under the movement of the sliding piston 14, which makes up for the space reduction of the external load.
[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A composite double-layer air spring low-frequency vibration isolation device, characterized in that, It includes a main air spring, an outer cylindrical steel support, an intermediate support steel plate, a limiting device, an inner cylindrical steel support, a load mounting platform, an additional air spring, a lower support steel plate, an upper support steel plate, and a throttle tube; The upper support steel plate and the lower support steel plate are respectively installed at the upper end and the lower end of the outer cylindrical support; A limiting device is provided on the inner side of the outer cylindrical steel support, and the intermediate support steel plate is connected to the limiting device by a spring. The main air spring is positioned between the lower support steel plate and the middle support steel plate; The additional air spring is disposed between the upper support steel plate and the middle support steel plate; The main air spring and the auxiliary air spring are connected by a throttle tube; The intermediate support steel plate is connected to the inner cylindrical steel support, and a load-bearing installation platform is set on the inner cylindrical steel support.
2. The composite double-layer air spring low-frequency vibration isolation device according to claim 1, characterized in that, The intermediate support steel plate has multiple evenly distributed auxiliary air springs, each of which is connected to the main air spring through a throttle tube.
3. The composite double-layer air spring low-frequency vibration isolation device according to claim 2, characterized in that, One end of the throttle tube is connected to the bottom of the main air spring, and the other end of the throttle tube is connected to the top of the auxiliary air spring.
4. The composite double-layer air spring low-frequency vibration isolation device according to claim 2, characterized in that, The intermediate support steel plate is equipped with four evenly distributed additional air springs.
5. The composite double-layer air spring low-frequency vibration isolation device according to claim 1, characterized in that, The limiting device includes an upper limiting device and a lower limiting device. The intermediate support steel plate is disposed between the upper limiting device and the lower limiting device, and springs are provided between the intermediate support steel plate and both the upper limiting device and the lower limiting device.
6. The composite double-layer air spring low-frequency vibration isolation device according to claim 1, characterized in that, The additional air spring is connected to the upper support steel plate via an adjusting nut.
7. The composite double-layer air spring low-frequency vibration isolation device according to claim 1, characterized in that, The upper support steel plate is provided with a through hole, and the inner cylindrical steel support extends to the outside of the upper support steel plate after passing through the through hole.
8. The composite double-layer air spring low-frequency vibration isolation device according to claim 1, characterized in that, The lower support steel plate is provided with a groove, and a sliding piston is provided in the groove; The outer cylindrical steel support, the intermediate support steel plate, and the piston are connected by a connecting rod.
9. The composite double-layer air spring low-frequency vibration isolation device according to claim 8, characterized in that, The outer cylindrical steel support, the intermediate support steel plate, and the piston are all hinged to the connecting rod.