Self-resetting bidirectional colloid damper and assembling method thereof

Abstract

The invention relates to a self-resetting two-way colloid damper and an assembling method thereof, and belongs to the technical field of vibration control, the self-resetting two-way colloid 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 working liquid with a porous lyophobic matrix, and the cylinder body is filled with the working liquid. The guide cylinder and the tail cylinder are respectively arranged at two ends of the cylinder body to form a cylinder body of the damper; an upper pressing plate is arranged on the side, close to the guide cylinder, in the cylinder of the damper, and a lower pressing plate is arranged on the side, close to the tail cylinder, in the cylinder of the damper. An upper piston and a lower piston are oppositely arranged on the inner side of the upper pressing plate and the inner side of the lower pressing plate correspondingly. A working liquid with a porous lyophobic matrix is filled between the upper piston and the lower piston; and the compression spring is sleeved on the piston rod between the upper piston and the lower piston. According to the invention, the problem of vibration control under normal use of constructional engineering and other dynamic systems can be solved, and the design of constructional engineering based on functionality and safety is realized.

Description

Technical Field

[0001] The invention relates to a damper, in particular to a self-resetting bidirectional colloid damper and an assembly method thereof, belonging to the technical field of civil engineering vibration control. Background Art

[0002] Regarding the seismic performance of structures, the seismic design code takes "no collapse in a major earthquake, repairable in a moderate earthquake, and no damage in a minor earthquake" as the seismic design principle, with the main goal of protecting the structure from destruction and protecting life safety. Early seismic structures resisted earthquakes by enhancing structural strength and relied on plastic deformation of the structure to consume earthquake energy. This approach ultimately led to damage to the building structure, so scholars conducted research on energy dissipation devices, among which the most mature and reliable device is the damper.

[0003] Dampers are key components 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. At present, 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 their temperature to increase significantly during operation. The most popular dampers are based on viscous fluids, called viscous dampers. During operation, the viscous fluid in the viscous damper is forced to dissipate energy by generating resistance through the orifice. For example, CN118149035A discloses a single-rod viscous damper with an additional limit slider device, and CN220204507U discloses a viscous damper. However, viscous dampers always have rubber seals to prevent the viscous fluid from flowing out with the piston rod. Therefore, the increase in temperature will reduce the sealing performance of the rubber material, so high temperature is one of the key factors that reduce the durability of the viscous damper. In addition, the viscosity of the fluid always changes with temperature. Therefore, the temperature increase will also affect the damping performance of the damper and cause the dynamic system to run away. On the other hand, the viscous damping mechanism requires laminar flow, which occurs at low Reynolds numbers. That is, in order to ensure low laminar flow, the speed of the piston should be low enough to ensure that the viscous force is greater than the inertial force. Therefore, the viscous damper can only work in the low frequency range. In order to make the viscous damper work in the 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 construction of the viscous damper complicated. Therefore, it is very necessary to develop a damper with low heat generation and a different damping mechanism so that they can operate in a wider frequency band without complex mechanical accessories. Summary of the invention

[0004] In view of the above-mentioned defects of the above-mentioned prior art, the present invention proposes a self-resetting bidirectional colloid damper and an assembly method thereof, which can effectively solve the problem of vibration control under normal use of construction projects and other dynamic systems, and realize the design of construction projects based on functionality and safety.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A self-resetting bidirectional colloid damper comprises a piston connecting rod, a guide cylinder, an upper pressure plate, a cylinder body, a piston rod, an upper piston, a lower piston, a lower pressure plate, a piston rod limit nut, a tail cylinder, a compression spring and a working liquid with a porous hydrophobic matrix filled in the cylinder body;

[0007] The guide cylinder and the tail cylinder are respectively arranged at the two ends of the cylinder body to constitute the cylinder body of the damper; an upper pressure plate is arranged on the side of the cylinder body of the damper close to the guide cylinder, and a lower pressure plate is arranged on the side close to the tail cylinder; an upper piston and a lower piston are respectively arranged on the inner side of the upper pressure plate and the inner side of the lower pressure plate; a working fluid with a porous hydrophobic matrix is ​​filled between the upper piston and the lower piston; the piston rod is sealed and passes through the upper pressure plate, the upper piston, the lower piston and the lower pressure plate in sequence, a piston rod limiting nut is arranged at one end of the piston rod, and a piston connecting rod is connected to the other end; the compression spring is sleeved on the piston rod between the upper piston and the lower piston.

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

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

[0010] Furthermore, the piston rod passes through the center position of the U-shaped structure bottom plate of the upper pressing plate and the lower pressing plate.

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

[0012] Furthermore, two ends of the compression spring abut against the inner sides of the upper piston and the lower piston respectively, and exert a certain prestress.

[0013] Furthermore, the working liquid with the porous lyophobic matrix can form a colloidal suspension.

[0014] Furthermore, the porous lyophobic matrix is ​​composed of silica gel, aerogel, ceramic, glass, zeolite, carbon, and alumina; the working liquid is a lyophobic fluid, and the lyophobic fluid is lyophobic fluid water or an aqueous solution.

[0015] Furthermore, the aqueous solution is a combination of silica gel matrix-water, the silica gel matrix is ​​composed of porous particles with a particle size of b, and the mesopores with a radius of a appear in the form of cross-tubes and exist in the silica gel matrix in complex directions; the entire inner and outer surfaces of the silica gel matrix are hydrophobized with C18 groups; when the damper is subjected to pressure outside, the pressure is transmitted to the working fluid inside the cylinder through the piston rod, the upper piston and the lower piston, causing the working fluid to be forced to penetrate into the silica gel matrix, and due to the surface tension of the liquid and the contact angle θ of the silica gel matrix, the external pressure p at this time will counteract the Laplace capillary pressure and the gas pressure trapped in the silica gel matrix, and capillary pressure will also be generated during unloading, which will often push out the silica gel matrix, that is, the liquid in the porous matrix; when the liquid enters the silica gel matrix and is pushed out, hysteresis will occur due to the difference in the inlet and outlet contact angles θ, which ultimately leads to energy dissipation.

[0016] The assembly method of the above-mentioned self-resetting bidirectional colloid damper is as follows: during installation, the cylinder barrel, the lower pressure plate, the lower piston, the piston rod, the piston rod limit nut, the tail cylinder and the tail cylinder assembly are first connected and assembled from bottom to top in sequence, leaving space for filling the working liquid with a porous hydrophobic matrix and installing the compression spring; after filling, the upper piston, the upper pressure plate, the ear plate assembly and the piston connecting rod and the guide cylinder are installed, so that the upper piston, the cylinder body and the lower piston form a closed space. When the external pressure is transmitted from the upper piston or the lower piston to the working liquid with a porous hydrophobic matrix, the working liquid inside the cylinder body is forced to penetrate into the porous hydrophobic matrix under pressure to resist the capillary pressure. When the pressure is unloaded, hysteresis will occur due to the different contact angles. Finally, the energy will be dissipated after the end of this loading and unloading cycle.

[0017] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0018] a. Compared with some commonly used damping devices in the field of structural vibration control, the internal pressure of the colloid damper can reach up to 60Mpa. It has the advantages of smaller volume, greater output and higher ratio of damping force to its own weight. It has the characteristics of good energy dissipation capacity in small size. Therefore, it is particularly suitable for use in support or in working environments where space is limited but greater damping is required.

[0019] b. Compared with the traditional viscous damper, which dissipates energy by converting mechanical energy into heat energy, its dissipated energy is greatly affected by temperature changes because the viscosity of mineral oil changes dramatically with temperature. The colloid damper converts mechanical energy into gas-liquid-solid surface energy dissipation. This energy conversion is more than twice as efficient as the viscous damper and is not affected by temperature.

[0020] c. The force of the colloid damper does not depend on the piston speed, and the frequency range of vibration reduction is wide. It can reduce vibrations in different frequency ranges and intensities, meet the three levels of seismic design, and can well solve the contradiction between high-frequency subway vibration and damping in the dual vibration control. The 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, various anti-vibration protections, etc.

[0021] d. Due to the particularity of the energy dissipation mechanism of the porous hydrophobic matrix and the working fluid, most of the existing dampers of this type are mainly in the form of unidirectional compression, that is, unidirectional displacement type. However, the vibration of the structure is random and multi-directional, and the unidirectional displacement greatly limits the function of the damper; therefore, this project develops a colloidal damper in which the medium liquid 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 so that the medium enters the porous matrix to produce an effect. For the first time, the energy dissipation of the colloidal damper under bidirectional vibration is realized, and the damper also has the characteristic of self-reset function.

[0022] e. The present invention is aimed at the engineering needs of damping of construction projects and dynamic systems, and in particular is a new type of damper using a porous liquid-repellent matrix material. It is technically feasible, has a reasonable structure, is safe and reliable, has efficient vibration reduction, is easy to install, and is easy to maintain, and has engineering application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is an energy dissipation mechanism curve of the colloidal damper proposed by Suciu et al. and a schematic diagram of the three-level stage of earthquake resistance / vibration resistance that the present invention intends to achieve;

[0024] Figure 2 It is a schematic cross-sectional assembly diagram of the self-resetting bidirectional colloid damper of the present invention in a balanced state;

[0025] Figure 3 It is a schematic diagram of the tension state of the present invention;

[0026] Figure 4 It is a schematic diagram of the compressed state of the present invention;

[0027] Figure 5 It is the force-displacement curve and the three-level stage diagram of earthquake resistance / vibration that have been realized in the present invention. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 The present invention is further described in detail with specific implementations to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0029] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example 1

[0032] As attached Figure 1-5 As shown, in order to achieve Figure 1 In order to achieve the effect, the present embodiment designs a self-resetting bidirectional colloid damper, including a piston connecting rod 2, a guide cylinder 3, an upper pressure plate 4, a cylinder body 5, a piston rod 6, an upper piston 7, a lower piston 9, a lower pressure plate 10, a piston rod limit nut 11, a tail cylinder 12, a compression spring 14 and a working liquid 8 with a porous hydrophobic matrix filled in the cylinder body.

[0033] The guide cylinder 3 and the tail cylinder 12 are respectively arranged at both ends of the cylinder body 5 to form the cylinder body of the damper. An upper pressure plate 4 is arranged on one side of the cylinder body of the damper close to the guide cylinder 3, and a lower pressure plate 10 is arranged on one side close to the tail cylinder 12. Both the upper pressure plate 4 and the lower pressure plate 10 are U-shaped structures.

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

[0035] In this embodiment, an upper piston 7 and a lower piston 9 are disposed opposite to each other on the inner side of the upper pressing plate 4 and the inner side of the lower pressing plate 10. A working fluid 8 with a porous hydrophobic matrix is ​​filled between the upper piston 7 and the lower piston 9. The piston rod 6 seals and penetrates the upper pressing plate 4, the upper piston 7, the lower piston 9 and the lower pressing plate 10 in sequence. In this embodiment, as Figure 2-4 As shown, the piston rod 6 passes through the center of the U-shaped structure bottom plate of the upper pressing plate 4 and the lower pressing plate 10.

[0036] One end of the piston rod 6 is provided with a piston rod limiting nut 11, and the other end is connected to the piston connecting rod 2. A compression spring 14 is sleeved on the piston rod 6 between the upper piston 7 and the lower piston 9. The two ends of the compression spring 14 are respectively abutted against the inner side of the upper piston 7 and the lower piston 9, and a certain prestress is applied.

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

[0038] In this embodiment, the working liquid 8 with a porous lyophobic matrix can form a colloidal suspension. The porous lyophobic matrix is ​​composed of silica gel, aerogel, ceramic, glass, zeolite, carbon, and alumina. The carbon can be graphite, charcoal, and fullerene. The working liquid 8 is a lyophobic fluid, and the lyophobic fluid is lyophobic fluid water or an aqueous solution. The aqueous solution can be, for example, water and antifreeze, ethylene glycol, propylene glycol, glycerol, etc. In this embodiment, from the perspective of environmental protection and economy, the preferred aqueous solution is a combination of silica gel matrix-water. The silica gel matrix is ​​composed of porous particles with a particle size of b, and the mesopores with a radius of a appear in the form of cross-tubular shapes and exist in complex directions inside the silica gel matrix. The entire inner and outer surfaces of the silica gel matrix are hydrophobized with C18 groups. As Figure 3-4 As shown in the figure, when the damper is subjected to pressure outside, the pressure is transmitted to the working fluid 8 inside the cylinder through the piston rod 6, the upper piston 7 and the lower piston 9, causing the working fluid 8 to be forced to penetrate into the silicone matrix. Due to the surface tension σ of the liquid and the contact angle θ of the silicone matrix, the external pressure p will counteract the Laplace capillary pressure (-2σcosθ / a) and the gas pressure trapped in the silicone matrix pg, and capillary pressure will also be generated during unloading, which tends to push out the liquid in the silicone matrix, that is, the porous matrix. When the liquid enters the silicone matrix and is pushed out, hysteresis will occur due to the difference in the in-and-out contact angle θ, which ultimately causes energy dissipation.

[0039] Example 2

[0040] The assembly method of the self-resetting bidirectional colloid damper of the above-mentioned embodiment 1 is to first connect and assemble the cylinder barrel 5, the lower pressure plate 10, the lower piston 9, the piston rod 6, the piston rod limit nut 11, the tail cylinder 12 and the tail cylinder assembly 13 from bottom to top, leaving space for filling the working liquid 8 with a porous liquid-repellent matrix and installing the compression spring 14. After filling, the upper piston 7, the upper pressure plate 4, the ear plate assembly 1 and the piston connecting rod 2, the guide cylinder 3 are installed, so that the upper piston 7, the cylinder body 5 and the lower piston 9 form a closed space, such as Figure 3-4As shown, when the external pressure is transmitted from the upper piston 7 or the lower piston 9 to the working fluid 8 with the porous lyophobic matrix, the working fluid 8 inside the cylinder is forced to penetrate into the porous lyophobic matrix to resist the capillary pressure. When the pressure is unloaded, hysteresis will occur due to the different contact angles. Finally, the energy will be dissipated after this loading and unloading cycle is completed. Figure 5 shown.

[0041] The above is only a preferred embodiment of the present invention, and does not impose any formal limitation on the structure of the present invention. The layout type and the number of uses of the present invention are not limited to this example, and can be optimized and selected according to the actual project. Any modification, equivalent change and decoration of the above embodiment based on the technical principle of the present invention that does not deviate from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A self-resetting bidirectional colloid damper, characterized in that: It comprises a piston connecting rod (2), a guide cylinder (3), an upper pressure plate (4), a cylinder body (5), a piston rod (6), an upper piston (7), a lower piston (9), a lower pressure plate (10), a piston rod limiting nut (11), a tail cylinder (12), a compression spring (14), and a working liquid (8) with a porous liquid-repellent matrix filled in the cylinder body; The guide cylinder (3) and the tail cylinder (12) are respectively arranged at the two ends of the cylinder body (5) to form the cylinder body of the damper; an upper pressure plate (4) is arranged on the side close to the guide cylinder (3) in the cylinder body of the damper, and a lower pressure plate (10) is arranged on the side close to the tail cylinder (12); an upper piston (7) and a lower piston (9) are respectively arranged on the inner side of the upper pressure plate (4) and the inner side of the lower pressure plate (10) in opposition to each other; a working liquid (8) containing a porous hydrophobic matrix is ​​filled between the upper piston (7) and the lower piston (9); the piston rod (6) is sealed and passes through the upper pressure plate (4), the upper piston (7), the lower piston (9) and the lower pressure plate (10) in sequence; a piston rod limiting nut (11) is arranged at one end of the piston rod (6), and the other end is connected to a 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).

2. The self-resetting bidirectional colloid damper according to claim 1 is characterized in that: The upper pressing plate (4) and the lower pressing plate (10) are both U-shaped structures.

3. The self-resetting bidirectional colloid damper according to claim 2 is characterized in that: 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).

4. The self-resetting bidirectional colloid damper according to claim 3 is characterized in that: The piston rod (6) passes through the center of the U-shaped structure bottom plate of the upper pressing plate (4) and the lower pressing plate (10).

5. The self-resetting bidirectional colloid damper according to claim 1 is characterized in that: The piston connecting rod (2) extends out of the guide cylinder (3) and is connected to the ear plate assembly (1); the outer side of the tail cylinder (12) is connected to the tail cylinder assembly (13).

6. The self-resetting bidirectional colloid damper according to claim 1, characterized in that: The two ends of the compression spring (14) are respectively in contact with the inner sides of the upper piston (7) and the lower piston (9), and a certain prestress is applied.

7. The self-resetting bidirectional colloid damper according to claim 1 is characterized in that: The working liquid (8) with the porous lyophobic matrix is ​​capable of forming a colloidal suspension.

8. The self-resetting bidirectional colloid damper according to claim 7, characterized in that: The porous lyophobic matrix is ​​composed of silica gel, aerogel, ceramic, glass, zeolite, carbon, and alumina; the working liquid (8) is a lyophobic fluid, and the lyophobic fluid is lyophobic fluid water or an aqueous solution.

9. The self-resetting bidirectional colloid damper according to claim 8, characterized in that: The aqueous solution is a combination of a silica gel matrix and water, wherein 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 cross-tubes and exist in a complex direction inside the silica gel matrix; the entire inner and outer surfaces of the silica gel matrix are hydrophobized with C18 groups; when the damper is subjected to pressure outside, the pressure is transmitted to the working liquid (8) inside the cylinder 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. Due to the surface tension of the liquid and the contact angle of the silica gel matrix, the external pressure will counteract the Laplace capillary pressure and the pressure of the gas trapped in the silica gel matrix, and capillary pressure will also be generated during unloading, which will often push out the silica gel matrix, that is, the liquid in the porous matrix; when the liquid enters the silica gel matrix and is pushed out, hysteresis will occur due to the difference in the inlet and outlet contact angles θ, which ultimately leads to energy dissipation.

10. An assembly method of a self-resetting bidirectional colloid damper according to any one of claims 1 to 9, characterized in that: During installation, the cylinder barrel (5), the lower pressure 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 first connected and assembled from bottom to top, leaving space for filling the working liquid (8) with the porous lyophobic matrix and installing the compression spring (14); after filling, the upper piston (7), the upper pressure 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 closed space. 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 matrix, the working liquid (8) inside the cylinder body is forced to penetrate into the porous lyophobic matrix to resist the capillary pressure due to the pressure. When the pressure is unloaded, hysteresis will occur due to the different contact angles. Finally, the energy will be dissipated after the end of this loading and unloading cycle.

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