CN112963487A

CN112963487A - Piston type molecular spring vibration isolator

Info

Publication number: CN112963487A
Application number: CN202110091107.1A
Authority: CN
Inventors: 缪旭弘; 王雪仁; 唐宇航; 周涛; 管峰; 苏常伟; 金阳; 刘瑞杰; 李欣; 滕汉东; 庄飚
Original assignee: People's Liberation Army 92578; Nanjing University of Aeronautics and Astronautics
Current assignee: People's Liberation Army 92578; Nanjing University of Aeronautics and Astronautics
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-06-15

Abstract

The invention relates to a piston type molecular spring vibration isolator, which comprises: base, cavity lid, piston rod, seal receptacle and spacing seat. The piston type molecular spring vibration isolator provided by the invention has the advantages that the telescopic structure of the piston is adopted to transmit vibration, so that the problem of poor strength of the traditional rubber is solved, the friction between metal and rubber does not exist, the high pressure bearing in the vibration isolator is ensured, and the piston type molecular spring vibration isolator has the three characteristic characteristics of large damping, low rigidity and high bearing capacity.

Description

Piston type molecular spring vibration isolator

Technical Field

The invention relates to a piston type molecular spring vibration isolator, and belongs to the technical field of vibration dampers.

Background

The molecular spring vibration isolation technology is characterized in that water and a porous hydrophobic material are utilized to form a molecular spring mixed medium, when pressure is applied to the molecular spring mixed medium, water molecules can enter hydrophobic nanometer micropores of the porous hydrophobic material, and when the pressure is unloaded, the water molecules escape from the micropores, so that energy storage and release are realized, and vibration is eliminated.

Some vibration isolators designed using molecular spring vibration isolation technology have been available in the prior art. Most of these vibration isolators adopt a rubber bladder structure or a metal piston rod combined rubber bladder/rubber membrane structure.

Since the vibration isolators are high pressure devices (about 20MPa to 30 MPa), the rubber is not strong enough to maintain high pressure for a long time, and thus the life is extremely short.

The combined structure of the metal piston rod and the rubber bag/rubber membrane has the problem that the friction between the piston rod and the rubber is overlarge, so that the dynamic stiffness of the molecular spring vibration isolator is overlarge, the natural frequency of a vibration isolation system is influenced, and the vibration isolation performance of the vibration isolator is further influenced.

Disclosure of Invention

The invention aims to solve the technical problems that: the defects of the technology are overcome, and the piston type molecular spring vibration isolator is provided.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a piston molecular spring vibration isolator comprising: the device comprises a base, a cavity cover, a piston rod, a sealing seat and a limiting seat; the base and the cavity cover are fixedly connected to form a cavity; the sealing seat is positioned at the top of the cavity and is fixedly connected with the cavity cover; the limiting seat is positioned at the top of the cavity cover and is fixedly connected with the cavity cover; the piston rod penetrates through the limiting seat and the sealing seat from top to bottom; the bottom end of the piston rod is positioned in the cavity, the top end of the piston rod is exposed out of the top of the limiting seat, and the piston rod and the sealing seat are movably sealed; and the cavity is filled with water and a molecular spring material.

The scheme is further improved in that: the base is provided with an opening, and a plug is arranged on the opening.

The scheme is further improved in that: the piston rod and the sealing seat are sealed through a plurality of universal plug seals.

The scheme is further improved in that: the base and the cavity cover are sealed through an O-shaped ring.

The scheme is further improved in that: the sealing seat and the cavity cover are sealed through an O-shaped ring.

The scheme is further improved in that: the molecular spring material is one or a mixture of several particles of hydrophobic zeolite, hydrophobic silica gel and hydrophobic metal organic framework material.

The scheme is further improved in that: the pores of the molecular spring material are micropores with the pore diameter of less than 2nm, or mesopores with the pore diameter of 2 to 50nm, or macropores with the pore diameter of more than 50 nm.

The scheme is further improved in that: the water can be supplemented with inorganic salts or surfactants or a mixture of both.

The scheme is further improved in that: the working pressure is 10 Mpa-200 Mpa.

The piston type molecular spring vibration isolator provided by the invention has the advantages that the telescopic structure of the piston is adopted to transmit vibration, so that the problem of poor strength of the traditional rubber is solved, the friction between metal and rubber does not exist, the high pressure bearing in the vibration isolator is ensured, and the piston type molecular spring vibration isolator has the three characteristic characteristics of large damping, low rigidity and high bearing capacity.

Drawings

The invention will be further explained with reference to the drawings.

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Figure 2 is a schematic illustration of the static equilibrium positions of the molecular spring isolator and the linear isolator under the same load.

Figure 3 is a force transfer curve comparison of a molecular spring isolator to a linear system.

Figure 4 is a graph comparing the displacement transmissibility of the molecular spring isolator to that of a linear system.

Detailed Description

Examples

The piston type molecular spring vibration isolator of the embodiment, as shown in fig. 1, comprises: the device comprises a base 3, a cavity cover 4, a piston rod 11, a sealing seat 6 and a limiting seat 9; the base 3 and the cavity cover 4 are fixedly connected through a bolt 2 to form a cavity; the sealing seat 6 is positioned at the top of the cavity and is fixedly connected with the cavity cover 4 through a bolt 7; the limiting seat 9 is positioned at the top of the cavity cover 4 and is fixedly connected with the cavity cover 4 through a bolt 10; the piston rod 11 penetrates through the limiting seat 9 and the sealing seat 6 from top to bottom; the bottom end of the piston rod 11 is positioned in the cavity, the top end of the piston rod is exposed out of the top of the limiting seat 9, and the piston rod 11 and the sealing seat 6 are movably sealed; the cavity is filled with water and molecular spring material. The base 3 is provided with an opening, and a plug 1 is arranged on the opening.

The piston rod 11 and the sealing seat 6 are sealed by two universal plug seals 12. The base 3 and the chamber cover 4 are sealed by an O-ring 5. The sealing seat 6 and the cavity cover 4 are sealed by an O-shaped ring 8.

The molecular spring material is one or a mixture of several particles of hydrophobic zeolite, hydrophobic silica gel and hydrophobic metal organic framework material. The pore diameter of the molecular spring material is micropore smaller than 2nm, or mesopore of 2-50 nm, or macropore with pore diameter larger than 50 nm. And selecting materials with different apertures according to the required pressure, wherein the working pressure is between 10Mpa and 200 Mpa.

The addition of the surfactant in the water can reduce the working pressure and the bearing capacity; the addition of inorganic salts and surfactants to water lowers the freezing point of water for use in environments with temperatures below zero degrees centigrade.

Inorganic salt is added into the water, so that the working pressure can be improved for improving the bearing capacity; the addition of the surfactant in the water can reduce the working pressure and the bearing capacity; the addition of inorganic salts and surfactants to water lowers the freezing point of water for use in environments with temperatures below zero degrees centigrade.

The base 3 and the cavity cover 4 bear stress and play a role in strength; the cavity plays a deformation role, and the volume of the cavity is driven to change through the movement of the piston rod 11, so that water and a molecular spring material are compressed and released, and the vibration isolation and buffering effects are achieved.

Since the flexible material is not used as the deformation structure in this embodiment, the defect of the flexible material itself, such as a bladder made of a rubber material, can be avoided.

In the field of vibration isolation, it is desirable that the elastic element is as soft as possible to lower the natural frequency of the system to obtain a wider vibration isolation frequency band and a lower vibration transmission rate, however, in engineering, an over-soft spring tends to bring about an excessive static displacement while requiring a sufficiently large installation space, and therefore, actual vibration isolation is often a compromise between the requirement of load capacity and the vibration isolation performance. Due to the unique segmental stiffness characteristic, the molecular spring vibration isolator has the stiffness characteristics of high static stiffness and low dynamic stiffness, so that high bearing capacity and low working stiffness can be considered.

Fig. 2 compares the static equilibrium position of the molecular spring vibration isolator with that of the conventional linear vibration isolation damper under the same load, and for the sake of comparison, the molecular spring vibration isolator adopts equivalent linearized stiffness. Compared with a linear vibration isolator, the molecular spring vibration isolator has obvious advantages. In a static balance state, if the static displacement is the same as that of the molecular spring vibration isolator, the rigidity of the linear vibration isolator is far greater than that of the working section of the molecular spring vibration isolator, and the vibration isolation frequency range is reduced; if the vibration isolation effect identical to that of the molecular spring vibration isolator is required to be obtained, the static displacement of the static balance position of the linear vibration isolator is far larger than that of the molecular spring vibration isolator, so that the requirement on installation space is greatly increased. Fig. 2 is only an example of a load of 730Kg, and if the load reaches several tons or even several tens of tons, the difference is more significant.

As shown in fig. 3, the force transmissibility curves of the molecular spring vibration isolator and the linear system are compared; as shown in fig. 4, the displacement transmittance curves of the molecular spring vibration isolator and the linear system are compared.

The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.

Claims

1. A piston molecular spring vibration isolator, comprising: the device comprises a base, a cavity cover, a piston rod, a sealing seat and a limiting seat; the base and the cavity cover are fixedly connected to form a cavity; the sealing seat is positioned at the top of the cavity and is fixedly connected with the cavity cover; the limiting seat is positioned at the top of the cavity cover and is fixedly connected with the cavity cover; the piston rod penetrates through the limiting seat and the sealing seat from top to bottom; the bottom end of the piston rod is positioned in the cavity, the top end of the piston rod is exposed out of the top of the limiting seat, and the piston rod and the sealing seat are movably sealed; and the cavity is filled with water and a molecular spring material.

2. The piston-type molecular spring vibration isolator of claim 1, wherein: the base is provided with an opening, and a plug is arranged on the opening.

3. The piston-type molecular spring vibration isolator of claim 1, wherein: the piston rod and the sealing seat are sealed through a plurality of universal plug seals.

4. The piston-type molecular spring vibration isolator of claim 1, wherein: the base and the cavity cover are sealed through an O-shaped ring.

5. The piston-type molecular spring vibration isolator of claim 1, wherein: the sealing seat and the cavity cover are sealed through an O-shaped ring.

6. The piston-type molecular spring vibration isolator of claim 1, wherein: the molecular spring material is one or a mixture of several particles of hydrophobic zeolite, hydrophobic silica gel and hydrophobic metal organic framework material.

7. The piston-type molecular spring vibration isolator of claim 1, wherein: the pores of the molecular spring material are micropores with the pore diameter of less than 2nm, or mesopores with the pore diameter of 2 to 50nm, or macropores with the pore diameter of more than 50 nm.

8. The piston-type molecular spring vibration isolator of claim 1, wherein: the water is added with inorganic salt or surfactant or mixture of the inorganic salt and the surfactant.

9. The piston-type molecular spring vibration isolator of claim 1, wherein: the working pressure is 10 Mpa-200 Mpa.