Self-centering bi-directional colloidal damper and method of assembling the same

Abstract

The present application relates to a kind of self-resetting bidirectional colloidal damper and its assembly method, belong to vibration control technical field, including piston connecting rod, guide cylinder, upper pressing plate, cylinder body, piston rod, upper piston, lower piston, lower pressing plate, piston rod limiting nut, tail cylinder, compression spring and the working liquid filled in cylinder body with porous liquid- permeable matrix.Guide cylinder and tail cylinder are respectively arranged at the both ends of cylinder body, constitute the cylinder body of damper;Upper pressing plate is arranged in the side of the cylinder body of damper close to guide cylinder, lower pressing plate is arranged in the side close to tail cylinder;Upper piston and lower piston are respectively arranged in the inner side of upper pressing plate and lower pressing plate;The working liquid filled with porous liquid-permeable matrix between upper piston and lower piston;Compression spring is set on the piston rod between upper piston and lower piston.The present application can solve the vibration control problem under normal use of construction engineering and other dynamic systems, realize the design of construction engineering based on functionality and safety.

Description

TECHNICAL FIELD

[0001] The present application relates to a damper, in particular a self-centering bidirectional colloidal damper and its assembling method, belonging to the technical field of civil engineering vibration control. BACKGROUND

[0002] For the seismic performance of structures, the seismic design code takes "no collapse in major earthquake, repairable in moderate earthquake, no damage in minor earthquake" as the seismic design principle, and takes protecting structures from being destroyed and protecting life safety as the main goal. The early seismic structure resists earthquakes by strengthening the strength of the structure, and at the same time relies on the plastic deformation of the structure to consume earthquake energy. This way will eventually cause the building structure to be damaged, so scholars have carried out research on energy dissipation devices, and the most mature and reliable device is the damper.

[0003] Dampers are key devices for vibration control and isolation in dynamic systems. They are used to absorb and dissipate energy and are widely used in vehicle suspension systems, vibration control of civil structures, and vibration isolation of precision equipment. Currently, dampers are developed based on one of the following mechanisms: viscous flow, friction type, and eddy current. Therefore, most current dampers convert mechanical energy into heat, causing a significant temperature rise during operation. The most popular dampers are based on viscous fluid, known as viscous dampers. In the working process, the viscous fluid in the viscous damper is forced to pass through the orifice to generate resistance to dissipate energy. Such as CN118149035A discloses a single-out-pole viscous damper with an additional limiting sliding block device, CN220204507U discloses a viscous damper. However, viscous dampers always have rubber seals to prevent viscous fluid from flowing out with the piston rod. Therefore, temperature rise will reduce the sealing performance of rubber materials, so high temperature is one of the key factors that reduce the durability of viscous dampers. In addition, the viscosity of the fluid always changes with temperature. Therefore, temperature rise will also affect the damping performance of the damper and cause the dynamic system to lose control. On the other hand, the viscous damping mechanism requires laminar flow, which occurs at low Reynolds numbers. That is, in order to guarantee laminar flow, the speed of the piston should be low enough to ensure that the viscous force is greater than the inertial force. Therefore, viscous dampers can only work in a low frequency range. In order to make viscous dampers work in a high frequency range, a high pressure air chamber / balloon is usually used to increase the pressure of the viscous fluid. However, this way makes the viscous damper structure complex. Therefore, it is very necessary to develop a damper with low heat generation and different damping mechanism, which can work in a larger frequency range without complex mechanical accessories. SUMMARY

[0004] In view of the above defects of the prior art, the self-resetting bidirectional colloidal damper and the assembling method thereof can effectively solve the vibration control problem of the building engineering and other dynamic systems under normal use, and realize the design of the building engineering based on functionality and safety.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] The self-resetting bidirectional colloidal damper comprises a piston connecting rod, a guide cylinder, an upper pressing plate, a cylinder body, a piston rod, an upper piston, a lower piston, a lower pressing plate, a piston rod limiting nut, a tail cylinder, a compression spring and a working liquid filled in the cylinder body and having a porous liquid-repellent matrix.

[0007] The guide cylinder and the tail cylinder are respectively arranged at two ends of the cylinder body, and constitute a cylinder body of the damper; the upper pressing plate is arranged on one side of the cylinder body of the damper close to the guide cylinder, and the lower pressing plate is arranged on one side close to the tail cylinder; the upper piston and the lower piston are respectively arranged on the inner side of the upper pressing plate and the inner side of the lower pressing plate; the working liquid having the porous liquid-repellent matrix is filled between the upper piston and the lower piston; the piston rod is sequentially sealed and penetrates through the upper pressing plate, the upper piston, the lower piston and the lower pressing plate, one end of the piston rod is provided with the piston rod limiting nut, and the other end of the piston rod is connected with the piston connecting rod; the compression spring is sleeved on the piston rod between the upper piston and the lower piston.

[0008] Further, the upper pressing plate and the lower pressing plate are both U-shaped structures.

[0009] Further, in the initial state, the two sides of the U-shaped structure of the upper pressing plate abut against the inner side of the guide cylinder; the two sides of the U-shaped structure of the lower pressing plate abut against the inner side of the tail cylinder.

[0010] Further, the piston rod penetrates through the central position of the bottom plate of the U-shaped structure of the upper pressing plate and the lower pressing plate.

[0011] Further, the piston connecting rod extends out of the guide cylinder and is connected with an ear plate assembly; the outer side of the tail cylinder is connected with a tail cylinder assembly.

[0012] Further, the two ends of the compression spring abut against the inner sides of the upper piston and the lower piston respectively, and a certain pre-stress is applied.

[0013] Further, the working liquid having the porous liquid-repellent matrix can form a colloidal suspension.

[0014] Further, the porous liquid-repellent matrix is composed of silica gel, aerogel, ceramic, glass, zeolite, carbon and alumina; the working liquid is a liquid-repellent fluid, and the liquid-repellent fluid is a liquid-repellent fluid water or a water solution.

[0015] Further, the aqueous solution is a combination of a silica gel matrix and water, the silica gel matrix is composed of porous particles with a particle size of b, mesopores with a radius of a appear in the form of intersecting tubes and exist in the silica gel matrix in a complex direction; the entire inner and outer surface of the silica gel matrix is hydrophobically treated with C18 groups; when the damper is externally pressed, the pressure is transmitted to the working liquid inside the cylinder through the piston rod, the upper piston and the lower piston, causing the working liquid to be forced to penetrate into the silica gel matrix, due to the liquid surface tension and the contact angle θ of the silica gel matrix, the external pressure p at this time will resist the Laplace capillary pressure and the gas pressure trapped in the silica gel matrix, and the capillary pressure will also be generated when unloading, which tends to push the liquid in the silica gel matrix, i.e. the porous matrix; during the process of the liquid entering and being pushed out of the silica gel matrix, hysteresis will occur due to the difference in the contact angle θ, eventually leading to energy dissipation.

[0016] The assembly method of the self-resetting bidirectional colloidal damper described above, during installation, the cylinder, the lower pressing plate, the lower piston, the piston rod, the piston rod limiting nut, the tail cylinder and the tail cylinder assembly are sequentially connected and assembled from bottom to top, leaving space for filling the working liquid with a porous liquid- repellent matrix and installing the compression spring; after filling is completed, the upper piston, the upper pressing plate, the ear plate assembly and the piston connecting rod and the guide cylinder are installed, so that the upper piston, the cylinder and the lower piston form a closed space, when external pressure is transmitted to the working liquid with a porous liquid-repellent matrix from the upper piston or the lower piston, the working liquid inside the cylinder is forced to penetrate into the porous liquid-repellent matrix to resist the capillary pressure, and when the pressure is unloaded, hysteresis will occur due to the difference in the contact angle, and eventually the energy is dissipated after one loading and unloading cycle.

[0017] After the above technical scheme is adopted, the present application has the following beneficial effects compared with the prior art:

[0018] a. Compared with some damping devices commonly used in the field of structural vibration control, the internal pressure of the colloidal damper can reach 60Mpa, has the advantages of smaller size, greater output and higher damping force to weight ratio, has the characteristics of good energy dissipation capacity under small size, and is particularly suitable for use in bearings or working environments with limited space but requiring large damping.

[0019] b. Compared with the traditional viscous damper, the viscous damper dissipates energy by converting mechanical energy into heat energy, and the dissipated energy is greatly affected by temperature changes, because the viscosity of mineral oil changes dramatically with temperature. The colloidal damper converts mechanical energy into gas-liquid-solid surface energy dissipation, and the energy conversion efficiency is more than 2 times that of the viscous damper and is not affected by temperature.

[0020] c. The force of this colloidal damper does not depend on the piston speed, and it has a wide frequency range for vibration reduction. It can reduce vibrations of different frequency ranges and intensities, meeting the three levels of seismic design. It can also effectively solve the contradiction between high-frequency subway vibration and damping in dual vibration control. Its frequency range is more than 5 times higher than that of ordinary viscous dampers. Due to these important advantages, it can also be used in vehicle suspensions, shock absorbers, buffers, engine mounts, and various vibration protection systems.

[0021] d. Due to the unique energy dissipation mechanism of porous hydrophobic matrix and working fluid, most existing dampers of this type are primarily based on unidirectional compression, i.e., unidirectional displacement. However, the vibrations experienced by the structure are random and multidirectional, and unidirectional displacement greatly limits the function of the damper. Therefore, this project develops a type of colloidal damper where the medium fluid is compressed regardless of whether the colloidal damper is under tension or compression. When the colloidal damper is under tension or compression, the piston further compresses the medium, allowing it to enter the porous matrix and thus exert its effect. This is the first time that the energy dissipation of the colloidal damper under bidirectional vibration has been achieved, and the damper also possesses a self-resetting function.

[0022] e. This invention addresses the engineering needs of building engineering and dynamic system damping, and in particular, it provides a novel damper using porous hydrophobic matrix materials. The technology is feasible, the structure is reasonable, it is safe and reliable, it has high vibration reduction efficiency, it is easy to install and maintain, and it has value for engineering application and promotion. Attached Figure Description

[0023] Figure 1 This invention provides the energy dissipation mechanism curve of the colloidal damper proposed by Suciu et al., and a schematic diagram of the three-level seismic / vibration resistance stage that this invention aims to achieve.

[0024] Figure 2 This is a schematic cross-sectional view of the self-resetting bidirectional colloidal damper of the present invention in a balanced state.

[0025] Figure 3 This is a schematic diagram of the tensile state of the present invention;

[0026] Figure 4 This is a schematic diagram of the pressure state under which the present invention is implemented;

[0027] Figure 5 This invention currently presents the force-displacement curve and the three-level diagram of seismic / vibration resistance. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-5 The present invention will be further described in detail below to facilitate a clear understanding of the invention, but these descriptions do not constitute a limitation thereof.

[0029] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Embodiment 1

[0032] As shown in the accompanying Figures 1-5 , in order to achieve Figure 1 the effect, the embodiment designs a self-resetting bidirectional colloidal damper, which comprises a piston connecting rod 2, a guide cylinder 3, an upper pressing plate 4, a cylinder body 5, a piston rod 6, an upper piston 7, a lower piston 9, a lower pressing plate 10, a piston rod limiting nut 11, a tail cylinder 12, a compression spring 14 and a working liquid 8 filled in the cylinder body and having a porous liquid- permeable matrix.

[0033] The guide cylinder 3 and the tail cylinder 12 are respectively arranged at both ends of the cylinder body 5, constituting the cylinder body of the damper. The cylinder body of the damper is provided with the upper pressing plate 4 on the side close to the guide cylinder 3 and the lower pressing plate 10 on the side close to the tail cylinder 12, and the upper pressing plate 4 and the lower pressing plate 10 are both U-shaped structures.

[0034] As shown in the accompanying Figure 2 , in the initial state, the two sides of the U-shaped structure of the upper pressing plate 4 abut against the inner side of the guide cylinder 3. The two sides of the U-shaped structure of the lower pressing plate 10 abut against the inner side of the tail cylinder 12.

[0035] In the embodiment, the inner side of the upper pressing plate 4 and the inner side of the lower pressing plate 10 are respectively provided with the upper piston 7 and the lower piston 9. The working liquid 8 with a porous liquid-permeable matrix is filled between the upper piston 7 and the lower piston 9. The piston rod 6 penetrates the upper pressing plate 4, the upper piston 7, the lower piston 9 and the lower pressing plate 10 in sequence. In the embodiment, as shown in the accompanying Figures 2-4 , the piston rod 6 penetrates the central position of the bottom plate of the U-shaped structure of the upper pressing plate 4 and the lower pressing plate 10.

[0036] The piston rod 6 is provided with a piston rod limiting nut 11 at one end and connected with a piston connecting rod 2 at the other end. The piston rod 6 between the upper piston 7 and the lower piston 9 is sleeved with a compression spring 14. The two ends of the compression spring 14 abut against the inner sides of the upper piston 7 and the lower piston 9 respectively and exert a certain pre-stress.

[0037] In the embodiment, the piston connecting rod 2 extends out of the guide cylinder 3 and is connected with the ear plate assembly 1. The tail cylinder 12 is connected with a tail cylinder assembly 13 outside.

[0038] In the embodiment, the working liquid 8 with the porous liquid-repellent matrix can form a colloidal suspension. The porous liquid-repellent matrix is composed of silica gel, aerogel, ceramic, glass, zeolite, carbon, alumina, and the carbon can be graphite, charcoal, fullerene. The working liquid 8 is a liquid-repellent fluid, and the liquid-repellent fluid is a liquid-repellent fluid water or an aqueous solution. The aqueous solution can be, for example, water and an antifreeze agent, ethylene glycol, propylene glycol, glycerol, etc. In the embodiment, from the perspectives of environmental protection and economy, the preferred aqueous solution is a combination of a silica gel matrix and water. The silica gel matrix is composed of porous particles with a particle size of b, and mesopores with a radius of a appear in the form of intersecting tubes and exist in the silica gel matrix in a complex direction. The entire inner and outer surfaces of the silica gel matrix are hydrophobized with C18 groups. As shown in FIG. 1, when the damper is subjected to an external pressure, the pressure is transmitted to the working liquid 8 in the cylinder body through the piston rod 6, the upper piston 7 and the lower piston 9, causing the working liquid 8 to be forced to penetrate into the silica gel matrix. At this time, the external pressure p will counteract the Laplace capillary pressure (-2σcosθ / a) and the gas pressure trapped in the silica gel matrix pg, and the capillary pressure will also be generated when the damper is unloaded, which tends to push the liquid in the silica gel matrix, i.e. the porous matrix, out. During the process from the entry of the liquid into the silica gel matrix to the pushing out of the liquid, hysteresis will be generated due to the difference in the contact angle θ, and finally the energy will be dissipated. Figures 3-4

[0039] Embodiment 2

[0040] The assembly method of the self-resetting bidirectional colloidal damper of the above embodiment 1 is as follows. During installation, the cylinder body 5, the lower pressing plate 10, the lower piston 9, the piston rod 6, the piston rod limiting nut 11, the tail cylinder 12 and the tail cylinder assembly 13 are sequentially connected and assembled from bottom to top, leaving space for filling the working liquid 8 with the porous liquid-repellent matrix and installing the compression spring 14. After the filling is completed, the upper piston 7, the upper pressing plate 4, the ear plate assembly 1 and the piston connecting rod 2 and the guide cylinder 3 are installed, so that the upper piston 7, the cylinder body 5 and the lower piston 9 form a sealed space, as shown in FIG. 1. Figures 3-4 ​As shown, when the external pressure is transmitted from the upper piston 7 or the lower piston 9 to the working liquid 8 with the porous lyophobic substrate, the working liquid 8 inside the cylinder is forced to infiltrate the porous lyophobic substrate against the capillary pressure under the pressure. When the pressure is unloaded, the hysteresis phenomenon is caused due to the different contact angles, and finally the energy is dissipated after the loading and unloading cycle is completed. As shown in Figure 5 .

[0041] The above is only the preferred embodiment of the present application, and does not limit the structure of the present application in any form. The arrangement and the number of uses of the present application are not limited to the examples, and can be optimized according to the actual engineering. Any modification, equivalent change and decoration of the above embodiments according to the technical principle of the present application, without departing from the technical scheme of the present application, are still within the scope of the technical scheme of the present application.

Claims

1. A self-centering bidirectional colloidal damper, characterized by: The piston connecting rod (2), the guide cylinder (3), the upper pressing plate (4), the cylinder body (5), the piston rod (6), the upper piston (7), the lower piston (9), the lower pressing plate (10), the piston rod limiting nut (11), the tail cylinder (12), the compression spring (14) and the working liquid (8) filled in the cylinder body and having a porous liquid-repellent matrix are included. The guide cylinder (3) and the tail cylinder (12) are respectively arranged at two ends of the cylinder body (5) and constitute the cylinder body of the damper; the upper pressing plate (4) is arranged on the side close to the guide cylinder (3) in the cylinder body of the damper, and the lower pressing plate (10) is arranged on the side close to the tail cylinder (12); the upper piston (7) and the lower piston (9) are respectively arranged on the inner sides of the upper pressing plate (4) and the lower pressing plate (10); the working liquid (8) having a porous liquid-repellent matrix is filled between the upper piston (7) and the lower piston (9); the piston rod (6) is sealed and penetrates the upper pressing plate (4), the upper piston (7), the lower piston (9) and the lower pressing plate (10) in sequence, one end of the piston rod (6) is provided with the piston rod limiting nut (11), and the other end is connected with the piston connecting rod (2); the compression spring (14) is sleeved on the piston rod (6) between the upper piston (7) and the lower piston (9). The upper pressing plate (4) and the lower pressing plate (10) are both U-shaped structures; in the initial state, the two sides of the U-shaped structure of the upper pressing plate (4) abut against the inner side of the guide cylinder (3), and the two sides of the U-shaped structure of the lower pressing plate (10) abut against the inner side of the tail cylinder (12); the piston rod (6) penetrates the central position of the bottom plate of the U-shaped structure of the upper pressing plate (4) and the lower pressing plate (10); the piston connecting rod (2) extends out of the guide cylinder (3) and is connected with the ear plate assembly (1); the tail cylinder (12) is connected with the tail cylinder assembly (13) on the outer side.

2. The self-centering bi-directional colloidal damper according to claim 1, wherein: The two ends of the compression spring (14) abut against the inner sides of the upper piston (7) and the lower piston (9) and exert a certain pre-stress.

3. The self-centering bi-directional colloidal damper of claim 1, wherein: The working liquid (8) having a porous liquid-repellent matrix can form a colloidal suspension.

4. The self-centering bi-directional colloidal damper of claim 3, wherein: The porous liquid-repellent matrix is composed of silica gel, aerogel, ceramic, glass, zeolite, carbon and alumina; the working liquid (8) is a liquid-repellent fluid, and the liquid-repellent fluid is a liquid-repellent fluid water or a water solution.

5. The self-centering bi-directional colloidal damper of claim 4, wherein: The aqueous solution is a combination of silica gel matrix and water, the silica gel matrix is composed of porous particles with particle size b, mesopores with radius a appear in the form of intersecting tubes and exist in the silica gel matrix in complex directions; the entire inner and outer surface of the silica gel matrix is hydrophobically treated with C18 groups; when the damper is externally pressed, the pressure is transmitted to the working liquid (8) in the cylinder body through the piston rod (6), the upper piston (7) and the lower piston (9), causing the working liquid (8) to be forced to penetrate into the silica gel matrix, and due to the liquid surface tension and the contact angle of the silica gel matrix, the external pressure at this time will counteract the Laplace capillary pressure and the gas pressure trapped in the silica gel matrix, and when unloading, the capillary pressure will also be generated, which tends to push the liquid in the silica gel matrix, i.e. the porous matrix; when the liquid is in the process of entering the silica gel matrix and being pushed out, hysteresis will occur due to the difference in the entry and exit contact angles θ, eventually leading to energy dissipation.

6. A method of assembling a self-centering bidirectional colloidal damper according to any one of claims 1-5, characterized in that: When installing, first connect and assemble the cylinder body (5), the lower pressing plate (10), the lower piston (9), the piston rod (6), the piston rod limiting nut (11), the tail cylinder (12) and the tail cylinder assembly (13) from bottom to top in turn, leave space for filling the working liquid (8) with a porous liquid- repellent matrix and installing the compression spring (14); after filling, install the upper piston (7), the upper pressing plate (4), the ear plate assembly (1) and the piston connecting rod (2), the guide cylinder (3), so that the upper piston (7), the cylinder body (5) and the lower piston (9) form a closed space, when the external pressure is transmitted to the working liquid (8) with a porous liquid-repellent matrix from the upper piston (7) or the lower piston (9), the working liquid (8) in the cylinder body is forced to penetrate into the porous liquid-repellent matrix under pressure to resist the capillary pressure, and when the pressure is unloaded, hysteresis will occur due to the difference in the contact angles, and finally the energy will be dissipated after one loading and unloading cycle.

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