CN111442054A

CN111442054A - Viscous-viscoelastic composite damper

Info

Publication number: CN111442054A
Application number: CN202010312981.9A
Authority: CN
Inventors: 许伟志; 王曙光; 刘伟庆; 杜东升; 李威威
Original assignee: Nanjing Tech University
Current assignee: Nanjing Tech University
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-07-24

Abstract

The invention discloses a viscous-viscoelastic composite damper, which comprises a cylinder barrel (4) and end covers (3) arranged at two ends of the cylinder barrel (4), wherein inner holes of the two end covers (3) are fixedly bonded with an annular viscoelastic element (9) and an annular bonding body (10) in sequence, the middle parts of the two annular bonding bodies (10) are fixedly and hermetically connected with the same piston rod (2), the cylinder barrel (4), the end covers (3), the viscoelastic element (9), the annular bonding bodies (10) and the piston rod (2) form a closed chamber for filling viscous damping liquid, a piston (6) is fixedly arranged on the piston rod (2) positioned in the closed chamber, and the closed chamber is divided into a first chamber (7) and a second chamber (5) by the piston (6). The composite damper integrates the advantages of a viscous damper and a viscoelastic damper, improves the energy consumption efficiency and the application range of the damper, avoids the use of dynamic seal, and improves the reliability and the economical efficiency of the damper.

Description

Viscous-viscoelastic composite damper

Technical Field

The invention relates to the technical field of vibration control building dampers, in particular to a viscous-viscoelastic composite damper.

Background

The strong shock and strong wind can cause the structure to vibrate, and the excessive vibration can easily cause the discomfort of people or the damage of the structure. In the face of serious threats of earthquakes and strong wind disasters, advanced anti-seismic or anti-seismic technologies are urgently developed. Energy dissipation and shock absorption technology is an effective passive control technology, and once the technology is put forward, the technology attracts engineering attention, and mainly energy dissipation components are arranged on the structure to add effective damping to the structure so as to reduce the dynamic response of the structure.

Typical energy dissipaters are viscous dampers, friction dampers, metal dampers and viscoelastic dampers. The viscous damper belongs to a hydraulic damper, and has good effects on wind vibration control and shock absorption. The viscous damper generates damping by utilizing pressure difference generated by liquid flowing through small holes or gaps, and is a speed type damper. However, the damper has insufficient energy consumption capacity under the action of large earthquakes, and due to the fact that a dynamic seal needs to be arranged, the risk of liquid leakage caused by seal damage exists in the working state. Viscoelastic dampers can utilize shear deformation of a viscoelastic body to provide both elastic stiffness and damping to a structure. Due to the existence of elastic rigidity, the energy consumption efficiency is lower than that of a viscous damper in a small displacement stage. The two types of dampers have respective advantages and disadvantages, so that the development of a novel damper which can exert the advantages of the two types of dampers simultaneously has important engineering significance.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a viscous-viscoelastic composite damper which can make up the defects of insufficient energy consumption of the viscoelastic damper in a small earthquake stage, easy oil leakage of dynamic seal of the viscous damper and insufficient damping force under large earthquake.

The invention aims to solve the problems by the following technical scheme:

a viscous-viscoelastic composite damper is characterized in that: the damper comprises a cylinder barrel and end covers arranged at two ends of the cylinder barrel, wherein annular viscoelastic elements and annular bonding bodies are sequentially fixedly bonded in inner holes of the two end covers, the middle parts of the two annular bonding bodies are fixedly and hermetically connected with a same piston rod, the cylinder barrel, the end covers, the viscoelastic elements, the annular bonding bodies and the piston rod form a closed cavity for filling viscous damping liquid, a piston is fixedly arranged on the piston rod in the closed cavity, and the closed cavity is divided into a first cavity and a second cavity by the piston.

The annular viscoelastic element and the inner annular bonding body and the outer end cover form effective bonding action through vulcanization reaction so as to realize fixed connection of an interface.

The outer thread on the outer circumference of the end cover is fixedly connected with the inner thread on the inner wall of the cylinder barrel through threads, and O-shaped rings are arranged on the inner sides of the connecting positions of the cylinder barrel and the end cover respectively to form static seals so as to prevent viscous damping liquid from leaking at the threaded connecting positions.

The piston rod is fixedly connected with the two annular bonding bodies at the two ends of the cylinder barrel respectively through threads, and O-shaped rings are arranged on the inner sides of the joints of the piston rod and any one of the annular bonding bodies respectively to form static seals so as to prevent viscous damping liquid from leaking at the threaded joints.

The piston is fixedly connected to the piston rod through threads, an annular gap is arranged between the piston and the cylinder barrel, and/or a damping hole penetrating through the piston is formed in the piston.

The inner diameter of the damping holes which are annularly and uniformly distributed on the piston is linearly or nonlinearly changed along the length direction of the damping holes, and the damping holes are arranged perpendicular to the side surface of the piston or at other angles.

And the first end of the piston rod penetrates through the corresponding annular bonding body and then is connected with the first connecting pull head.

The first connecting pull head is fixedly connected with the penetrating end of the piston rod through a thread stroke; or the first connecting pull head is fixedly connected with the penetrating end of the piston rod through a thread stroke, and thread glue is smeared at the threaded connection part.

The end cover corresponding to the second end of the piston rod protrudes out of the cylinder barrel, the protruding portion of the end cover is fixedly connected with one end of the connecting cylinder barrel, and the other end of the connecting cylinder barrel is fixedly connected with the second connecting pull head.

And the end cover corresponding to the second end of the piston rod is recessed into the inner cavity of the cylinder barrel, and the cylinder barrel corresponding to the second end of the piston rod is fixedly connected with the second connecting pull head.

Compared with the prior art, the invention has the following advantages:

the viscous-viscoelastic composite damper integrates the advantages of the viscoelastic damper and the viscous damper on the basis of not increasing too many parts and basically not changing the geometric dimension of the damper, and the beneficial combined mode ensures that the damper can provide proper rigidity and enough energy consumption capability under small earthquake, exerts the energy consumption capability of the viscoelastic damper under large earthquake, reduces the deformation of a main body structure and ensures the safety of a building structure.

The rigidity and the damping of the viscous-viscoelastic composite damper have adjustability, can be realized by adjusting the geometric dimensions of a viscoelastic element and a piston or replacing the material of the viscoelastic element and viscous damping liquid, and have stronger adaptability; the viscous-viscoelastic composite damper also avoids the complex process that the conventional viscous damper needs to arrange a dynamic seal between the piston rod and the end cover, and reduces the risk of leakage; the components are fixedly connected by threads, so that the disassembly and the maintenance are convenient.

Drawings

FIG. 1 is a cross-sectional view of the viscous-viscoelastic composite damper of the present invention;

FIG. 2 is a sectional view A-A of the viscous-viscoelastic composite damper of the invention of FIG. 1;

FIG. 3 is a sectional view B-B of the viscous-viscoelastic composite damper of the invention of FIG. 1;

fig. 4 is a deformation state diagram of the viscous-viscoelastic composite damper of the present invention moving to one side.

Wherein: 1-a first connecting slider; 2-a piston rod; 3, end cover; 4, a cylinder barrel; 5-a second chamber; 6, a piston; 60-an annular gap; 61-damping hole; 7 — a first chamber; 8-O-shaped ring; 9-a viscoelastic element; 10-a ring-shaped bonded body; 11-connecting the cylinder barrel; 12-second connecting slider.

Detailed Description

The invention is further described with reference to the following figures and examples.

To further clarify the objects, attained methods, and advantages of the present invention, further description will be made with reference to the accompanying drawings. It should be apparent that the described example is only one manifestation of the invention and does not represent all examples.

In the description of the present invention, it is to be understood that the terms "left", "right", "inside" and "outside", etc., indicate orientations or positional relationships based only on the positional relationships in the drawings, and are only used for better describing the positional relationships among the parts, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.

As shown in fig. 1: a viscous-viscoelastic composite damper, the damper comprising: the cylinder 4, install in the end cover 3 at 4 both ends of cylinder, install in cylinder 4 and pass two end cover 3

's piston rod

2, 2 right-hand members of piston rod and first connection pull head 1 fixed connection, the outside and the end cover 3 bonding of annular viscoelastic element 9, the inboard bonds with annular bonding body 10, connect cylinder 11 and be located left end cover 3 fixed connection, the left side and the second of connecting cylinder 11 are connected pull head 12 fixed connection, piston 6 is fixed to be set up and is separated into first cavity 7 and second cavity 5 with the hydro-cylinder at the middle part of piston rod 2, four O type circles 8 set up and constitute the static seal in the damping cylinder is inside.

The above-described components are explained in detail below.

As shown in fig. 1 and 2, the inner side of the cylinder 4 is connected to the outer side of the annular end cap 3, the inner side of the annular end cap 3 is bonded to the outer side of the annular viscoelastic element 9, the inner side of the viscoelastic element 9 is bonded to the outer side of the annular bonded body 10, and the inner side of the annular bonded body 10 is fixedly connected to the piston rod 2. The O-shaped rings 8 are respectively arranged at the joint of the cylinder barrel 4 and the end cover 3 and the joint of the annular bonding body 10 and the piston rod 2.

As shown in fig. 3, the piston 6 is concentrically and fixedly connected with the piston rod 2, an annular gap 60 is arranged between the piston 6 and the cylinder barrel 4, the gap degree of the annular gap 60 has a remarkable influence on the magnitude of the damping force, and the purpose of changing the damping force can be achieved by adjusting the gap magnitude; further, the piston 6 may be provided with the damping holes 61, and the damping force and the damping index may be adjusted by providing the damping holes 61 in the size, number, direction, and the like.

The viscous-viscoelastic composite damper of the invention is improved in that: the cylinder barrel 4 is fixedly connected with the annular end covers 3 on the left side and the right side of the cylinder barrel, and the cylinder barrel 4 is connected with the end covers 3 through threads.

The viscous-viscoelastic composite damper of the invention is improved in that: the inside of the annular end cap 3 is provided with an annular viscoelastic element 9: the inner side of the viscoelastic element 9 is provided with an annular bonding body 10, the end cover 3, the viscoelastic element 9 and the annular bonding body 10 form a whole part with a synergistic effect through vulcanization reaction, and the viscoelastic element 9 can be made of rubber or other high polymer materials with viscoelastic properties.

The viscous-viscoelastic composite damper is improved in that the piston rod 2 penetrates through the end cover 3 to be fixedly connected with the annular bonding body 10, the O-shaped sealing ring 8 is arranged, and the annular bonding body 10 is tightly connected with the end cover 3 through the viscoelastic element 9, so that the dynamic seal arranged between the piston rod 2 and the end cover 3 of the traditional viscous damper is avoided.

The viscous-viscoelastic composite damper of the invention is improved in that: the piston 6 and the piston rod 2 can be fixedly connected through a thread stroke: an annular gap 60 is arranged between the piston 6 and the cylinder barrel 4, the size of the gap of the annular gap 60 can be adjusted according to the requirement of the damping force, the annular piston 6 can also be provided with through holes which are symmetrically arranged to be used as damping holes 61 for adjusting the damping force, and the alternative is as follows: the inner diameter of the damping hole 61 changes linearly or nonlinearly along the length direction of the damping hole 61, and the damping hole 61 is opened perpendicular to the side surface of the piston 6 or at other angles.

As shown in fig. 4, the first coupling slider 1 reciprocates the piston rod 2 left and right. Taking the rightward movement as an example, the piston 6 follows the piston rod 2 to move axially rightward, the first chamber 7 increases in space, and the second chamber 5 decreases in space; the viscous damping fluid in the second chamber 5 is pressed by the piston 6 and flows to the first chamber 7 through the annular gap 60 or the damping hole 61 on the piston 6, generating viscous damping force; the annular bonding body 10 also moves rightwards along with the piston rod 2, and the annular bonding body 10 drives the viscoelastic element 9 to generate a viscous damping force and an elastic force through the shearing deformation under the bonding action with the viscoelastic element 9.

The first connecting pull head 1, the piston rod 2, the end cover 3, the cylinder 4, the piston 6, the annular bonding body 10, the connecting cylinder 11 and the second connecting pull head 12 are all steel parts, viscous damping liquid 7 in the closed cavity can be silicon oil or other high-molecular viscous fluid, and the viscoelastic element 9 can be rubber or other high-molecular polymers with good viscoelastic property.

The viscous-viscoelastic composite damper integrates the advantages of the viscoelastic damper and the viscous damper on the basis of not increasing too many parts and basically not changing the geometric dimension of the damper, and the beneficial combined mode ensures that the damper can provide proper rigidity and enough energy consumption capability under small earthquake, exerts the energy consumption capability of the viscoelastic damper under large earthquake, reduces the deformation of a main body structure and ensures the safety of a building structure; the rigidity and the damping of the viscous-viscoelastic composite damper have adjustability, and the viscous-viscoelastic composite damper can be realized by adjusting the geometric dimensions of the viscoelastic element 9 and the piston 6 or replacing the material and the viscous damping liquid of the viscoelastic element 9, so that the viscous-viscoelastic composite damper has stronger adaptability; the viscous-viscoelastic composite damper also avoids the complex process that the conventional viscous damper needs to arrange a dynamic seal between the piston rod 2 and the end cover 3, and reduces the risk of leakage; the components are fixedly connected by threads, so that the disassembly and the maintenance are convenient.

The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.

Claims

1. A viscous-viscoelastic composite damper is characterized in that: the damper comprises a cylinder barrel (4) and end covers (3) arranged at two ends of the cylinder barrel (4), wherein annular viscoelastic elements (9) and annular bonding bodies (10) are sequentially fixedly bonded in inner holes of the two end covers (3), the middle parts of the two annular bonding bodies (10) are fixedly and hermetically connected with the same piston rod (2), the cylinder barrel (4), the end covers (3), the viscoelastic elements (9), the annular bonding bodies (10) and the piston rod (2) form a closed chamber for filling viscous damping liquid, a piston (6) is fixedly arranged on the piston rod (2) in the closed chamber, and the piston (6) divides the closed chamber into a first chamber (7) and a second chamber (5).

2. The viscous-viscoelastic composite damper according to claim 1, characterized in that: the annular viscoelastic element (9) forms effective bonding effect with the inner annular bonding body (10) and the outer end cover (3) through vulcanization reaction so as to realize fixed connection of an interface.

3. The viscous-viscoelastic composite damper according to claim 1, characterized in that: the outer thread on the outer circumferential surface of the end cover (3) is fixedly connected with the inner thread on the inner wall of the cylinder barrel (4) through threads, and O-shaped rings (8) are respectively arranged on the inner sides of the connection part of the cylinder barrel (4) and the end cover (3) to form static seal, so that viscous damping liquid is prevented from leaking at the threaded connection part.

4. The viscous-viscoelastic composite damper according to claim 1 or 3, characterized in that: the piston rod (2) is fixedly connected with the two annular bonding bodies (10) at the two ends of the cylinder barrel (4) through threads respectively, and O-shaped rings (8) are arranged on the inner sides of the joints of the piston rod (2) and any one annular bonding body (10) respectively to form static seals so as to prevent viscous damping liquid from leaking at the threaded joints.

5. The viscous-viscoelastic composite damper according to claim 1, characterized in that: the piston (6) is fixedly connected to the piston rod (2) through threads, an annular gap (60) is arranged between the piston (6) and the cylinder barrel (4) and/or a damping hole (61) penetrating through the piston (6) is formed in the piston (6).

6. The viscous-viscoelastic composite damper according to claim 5, characterized in that: the inner diameter of the damping holes (61) which are circumferentially and uniformly distributed on the piston (6) is linearly or nonlinearly changed along the length direction of the damping holes (61), and the damping holes (61) are arranged perpendicular to the side surface of the piston (6) or at other angles.

7. The viscous-viscoelastic composite damper according to claim 1, characterized in that: the first end of the piston rod (2) penetrates through the corresponding annular bonding body (10) and then is connected with the first connecting pull head (1).

8. The viscous-viscoelastic composite damper according to claim 7, characterized in that: the first connecting pull head (1) is fixedly connected with the penetrating end of the piston rod (2) through a thread stroke; or the first connecting pull head (1) is fixedly connected with the penetrating end of the piston rod (2) through a thread stroke, and thread glue is smeared at the thread connection position.

9. The viscous-viscoelastic composite damper according to claim 7, characterized in that: the end cover (3) corresponding to the second end of the piston rod (2) protrudes out of the cylinder barrel (4), the protruding portion of the end cover (3) is fixedly connected with one end of the connecting cylinder barrel (11), and the other end of the connecting cylinder barrel (11) is fixedly connected with the second connecting pull head (12).

10. The viscous-viscoelastic composite damper according to claim 7, characterized in that: the end cover (3) corresponding to the second end of the piston rod (2) is recessed into the inner cavity of the cylinder barrel (4), and the cylinder barrel (4) corresponding to the second end of the piston rod (2) is fixedly connected with the second connecting pull head (12).