A sealless metal viscous damper

Abstract

The application discloses a kind of unsealed metal viscous dampers, including telescopic ware, mandrel, connecting rod, end cap, sleeve, connecting lug and damping liquid, the middle part of unsealed damper is equipped with mandrel, telescopic ware is fixedly installed at the two ends of mandrel, connecting rod passes through the central part of mandrel, and can slide in the middle part of mandrel, and the two ends of connecting rod are equipped with end cap, and are connected with telescopic ware by end cap.The outer part of mandrel is fixed with sleeve, sleeve passes through the telescopic ware of one side of unsealed metal viscous damper, and connecting lug is installed on the outside of gland, when damper works, by the telescopic ware of bellows, damping liquid flows in mandrel, to generate damping force, the application is applied to building, bridge and industrial equipment damping field, simple structure, without sliding seal, there is no oil seepage and oil leakage problem.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology, mainly to viscous dampers, and in particular to a sealless metal viscous damper that solves the problems of oil seepage and leakage in existing viscous dampers. Background Technology

[0002] Viscous dampers are commonly used vibration reduction devices that achieve their damping effect by utilizing the damping properties of viscous fluids. They are widely used in mechanical engineering, aerospace, automotive manufacturing, and seismic isolation and damping. The basic structure of a viscous damper consists of a piston and a sealed sleeve, with viscous fluid filling the space between them. When the system moves, the piston pushes the viscous fluid, and the viscous resistance of the fluid creates a damping effect, thus absorbing vibrations.

[0003] Currently, the vibration damping industry typically uses dampers with sliding seal structures. However, existing viscous dampers often suffer from oil seepage and leakage problems due to the aging of the seals. Oil seepage and leakage reduce the viscous fluid, allowing air to enter the damper cavity and thus degrading its performance. Therefore, the industry frequently requires regular inspections and maintenance to promptly replace aging and damaged seals, or to select better sealing materials and structures to reduce the possibility of leakage. In short, oil seepage and leakage problems with viscous dampers increase production and maintenance costs, and also pose safety hazards due to damping fluid leakage. Summary of the Invention

[0004] To address the shortcomings and defects of the existing technology, the inventors, through research and development, proposed a metal viscous damper that does not require a sliding seal. This structure solves the problems of oil seepage and leakage in traditional dampers. Simultaneously, this technology reduces maintenance costs, improves reliability and stability, and extends service life. This helps improve system efficiency and sustainability, reduces operating costs, and meets environmental protection requirements. Specifically, this invention is implemented as follows:

[0005] A sealless metallic viscous damper includes the following structure:

[0006] Sleeve, used to mount the mandrel and accommodate a set of expansion joints;

[0007] The mandrel, mounted on the top of the sleeve, serves as a channel shaft for providing the telescopic displacement of the connecting rod and is provided with a damping fluid communication gap;

[0008] The connecting rod passes through the spindle, with one end inside the sleeve and the other end outside the sleeve;

[0009] The expansion joint has two sets, which are installed on both sides of the mandrel. One set is installed inside the sleeve and the other set is installed outside the sleeve. It wraps around the corresponding connecting rod and is fixed to the end of the connecting rod, so that the expansion joint and the connecting rod form a sealed inner cavity. The expansion joint can extend and retract accordingly with the extension and retraction of the connecting rod.

[0010] The damping fluid communication gap is set on the mandrel or inside the connecting rod to connect two sealed cavities;

[0011] The damping fluid is sealed inside the sealed cavities of the two sets of expansion joints and flows between them through the damping fluid communication gap in the spindle section.

[0012] Furthermore, pressure caps are installed at both ends of the connecting rod. The pressure caps are connected and fixed to the ends of the expansion joint through end caps, so that the expansion joint can extend and retract accordingly with the extension and retraction of the connecting rod, squeezing or expanding the damping fluid volume.

[0013] Furthermore, the mandrel includes: a mandrel sleeve, an annular sleeve body, with an upper cover plate and a lower cover plate installed at both ends, which are sleeved on the outer side of the middle part of the connecting rod to limit the circumferential displacement of the connecting rod; the damping fluid communication gap is set on the mandrel sleeve; the upper cover plate is installed on the upper end of the mandrel sleeve for connecting with the tail of the upper telescopic device, and has an upper guide hole on its surface; the lower cover plate is installed on the lower end of the mandrel sleeve for connecting with the tail of the lower telescopic device, and has a lower guide hole on its surface; the damping screw passes through the mandrel sleeve and has a middle guide hole, which can connect the upper guide hole and the lower guide hole to form a damping fluid communication gap, allowing the damping fluid to connect the sealed inner cavity of the upper and lower telescopic devices through the mandrel.

[0014] Furthermore, the damping fluid communication gap also includes: a gap between the mandrel and the connecting rod, the width of which is 0.5 to 3 mm, and the guide hole is a small circular hole with a diameter of 0.5 to 5 mm.

[0015] Furthermore, there are stiffening ribs on the outside of the mandrel sleeve, between the upper and lower cover plates.

[0016] In another structural configuration: the damping fluid communication gap is provided on the connecting rod, including: a communication pipe, opened inside the connecting rod, for connecting the communication openings at both ends of the connecting rod; and communication openings, opened at both ends of the connecting rod, respectively located in the sealed cavities within the two expansion joints, for connecting the communication pipe and the sealed cavities within the expansion joints; enabling the expansion joints to extend and retract accordingly with the extension and retraction of the connecting rod, squeezing or expanding the damping fluid in the sealed cavities so that it flows through the communication openings and the communication pipe, generating viscous damping.

[0017] Furthermore, the expansion joint is a metal bellows.

[0018] Furthermore, it also includes several armor rings, which are sequentially installed around the metal bellows to improve the pressure-bearing capacity of the metal bellows.

[0019] Furthermore, a connecting lug is installed on the outer end of the pressure cap, and a spherical bearing or ball bearing is installed on the connecting lug.

[0020] The working principle of this invention is as follows: This invention utilizes a sealed cavity formed between the telescoping device and the connecting rod, combined with the telescoping motion of the connecting rod and the mandrel structure, to achieve the mutual flow and transfer of internal damping fluid, thus achieving a damping effect. Simultaneously, since the telescoping of the connecting rod occurs within the telescoping device, a sliding seal structure is unnecessary; the entire internal cavity structure is an integrally sealed structure, eliminating the need for a sliding seal and avoiding the problems of damping fluid seepage and leakage associated with sliding seals. The structure of this invention is ingenious: a sleeve is used as the mounting carrier for the mandrel and the base for the telescoping space, housing the damping fluid cavity formed by the connecting rod and the telescoping device. The structure is simple and reliable. The damping fluid flows through the damping fluid connection gap in the internal cavity, connecting to the mandrel area, eliminating the need for a sliding seal structure and facilitating manufacturing and assembly. Viscous damping effect is generated through the compression or expansion of the viscous fluid within the telescoping device. Due to the flow through the damping fluid connection gap, the damping fluid can flow throughout the entire system, making the damping effect more uniform and stable. The damping force of the viscous damper can be adjusted by changing the size of the damping fluid connection gap to adapt to different engineering requirements. By using bidirectional sealing in multiple environments and metal bellows, the structural stability and pressure-bearing capacity of the damper are improved, enabling it to work under various operating conditions.

[0021] Beneficial technical effects of the present invention:

[0022] (1) Reduced maintenance costs: Traditional dampers require regular inspection and replacement of seals, while dampers without sliding seals can avoid these maintenance tasks throughout the building's life cycle, reducing maintenance costs.

[0023] (2) Increased reliability: Oil seepage and leakage are common damper problems, leading to decreased damper performance or even complete failure. Solving the oil seepage and leakage problems greatly improves the reliability of the damper.

[0024] (3) Enhanced performance stability: Oil seepage and leakage reduce the viscosity of the fluid, thereby reducing the performance of the damper. Dampers that do not require sliding seals are not affected by the reduction in viscosity and can always provide a stable damping effect, thus enhancing the performance stability of the system.

[0025] (4) Improved service life: Oil seepage and leakage can cause damper failure and damage, reducing its service life. Dampers without sliding seals are not affected by these problems and can extend their service life. Attached Figure Description

[0026] Figure 1 This is a front view of the structure of the unsealed metal viscous damper in Example 1;

[0027] Figure 2 This is a schematic diagram of the mandrel structure of the unsealed metal viscous damper in Example 1;

[0028] Figure 3 This is a front view of the structure of the unsealed metal viscous damper in Example 2;

[0029] Figure 4 This is a schematic diagram of the unsealed metal viscous damper in the compressed state in Example 2;

[0030] Figure 5 This is a schematic diagram of the tensile state structure of the unsealed metal viscous damper in Example 2. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0032] Example 1: A sealless metallic viscous damper, comprising the following structure:

[0033] Sleeve 1 is used to install mandrel 2 and accommodate a set of expansion joints 4; the bottom of the outer side of sleeve 1 can be a hinge seat for installing and determining the place where the unsealed metal viscous damper needs to be installed.

[0034] The spindle 2 is installed on the top of the sleeve 1 and serves as a channel shaft to provide the telescopic displacement of the connecting rod 3. The spindle 2 is the core structure of this unsealed metal viscous damper, that is, it is used as a sliding channel for the telescopic movement of the connecting rod 3. The limiting connecting rod 3 prevents its deviation, and at the same time, the telescopic devices 4 at both ends are installed.

[0035] The connecting rod 3 passes through the spindle 2, with one end located inside the sleeve 1 and the other end located outside the sleeve 1; as a movable component that can extend and retract after being subjected to force, it can extend and retract through the spindle 2.

[0036] The telescopic device 4 has two sets, which are respectively installed on both sides of the spindle 2. One set is installed inside the sleeve 1 and the other set is installed outside the sleeve 1. It wraps around the corresponding connecting rod 3 and is fixed at the end of the connecting rod 3, so that the telescopic device 4 and the connecting rod 3 form a sealed inner cavity. The telescopic device 4 can extend and retract accordingly with the extension and retraction of the connecting rod 3.

[0037] The damping fluid communication gap is set on the mandrel 2 to connect the two sealed inner cavities;

[0038] The damping fluid 5 is silicone oil, which is sealed in the sealed inner cavity of the two sets of expansion joints 4 and flows between them through the damping fluid communication gap in the spindle 2.

[0039] Based on the above basic structure, the basic structural composition of this unsealed metal viscous damper can be obtained, realizing its basic functions.

[0040] Preferably, pressure caps 41 are installed at both ends of the connecting rod 3. The pressure caps 41 are connected and fixed to the ends of the telescopic device 4 through end caps, so that the telescopic device 4 can extend and retract accordingly with the extension and retraction of the connecting rod 3, squeezing or expanding the volume of the damping fluid 5.

[0041] Preferably, the mandrel 2 includes: a mandrel sleeve 21, an annular sleeve body, with an upper cover plate 22 and a lower cover plate 23 installed at both ends, which is sleeved on the outer side of the middle part of the connecting rod 3 to limit the circumferential displacement of the connecting rod 3; the damping fluid communication gap is provided on the mandrel sleeve 21; the upper cover plate 22 is installed on the upper end of the mandrel sleeve 21 for connecting with the tail of the upper telescopic device 4, and has an upper guide hole 25 on its surface; the lower cover plate 23 is installed on the lower end of the mandrel sleeve 21 for connecting with the tail of the lower telescopic device 4, and has a lower guide hole 27 on its surface; the damping screw 24 passes through the mandrel sleeve 21 and has a middle guide hole 26, which can connect the upper guide hole 25 and the lower guide hole 27 to form a damping fluid communication gap, allowing the damping fluid 5 to communicate with the sealed inner cavity of the upper and lower telescopic devices 4 through the mandrel 2. The damping fluid communication gap also includes a gap between the mandrel 2 and the connecting rod 3, the width of which is 0.5–3 mm. The guide hole is a small circular hole with a diameter of 0.5–5 mm. On the outside of the mandrel sleeve 21, between the upper cover plate 22 and the lower cover plate 23, there is a reinforcing rib 28 to strengthen the mandrel 2 and facilitate installation and fixation. Preferably, a limiter is also provided, which is installed on the connecting rod 3 to prevent the stroke of the unsealed metal viscous damper from exceeding the design maximum value. A connecting lug 43 is installed on the outer end of the pressure cap 41, and the connecting lug 43 is fitted with a spherical bearing or ball bearing, which is used to install and fix the other end of the unsealed metal viscous damper.

[0042] When the damper is working, the damping fluid 5 flows in the spindle 2 by the expansion and contraction of the bellows, thereby generating damping force. This invention is applied to the field of vibration reduction in buildings, bridges and industrial equipment. It has a simple structure, does not require sliding seals, and does not have the problems of oil seepage and leakage.

[0043] Example 2: Another structural form

[0044] Based on Example 1, the difference lies in that: the damping fluid communication gap is set on the connecting rod 3, and the connecting rod 3 has the following features: the connecting rod 3 also includes: a connecting pipe 31, which is opened inside the connecting rod 3 and is used to connect the connecting openings 32 at both ends of the connecting rod 3; the connecting openings 32 are opened at both ends of the connecting rod 3 and are respectively located in the sealed inner cavities of the two expansion joints 4, and are used to connect the connecting pipe 31 and the sealed inner cavities of the expansion joints 4; this allows the expansion joints 4 to expand and contract accordingly with the extension and retraction of the connecting rod 3, squeezing or expanding the damping fluid 5 in the sealed inner cavity so that it flows through the connecting openings 32 and the connecting pipe 31, generating viscous damping. This structure eliminates the need for gaps and guide holes in the mandrel 2, making the structure of the mandrel 2 more stable and easier to process. The overall structure can be compact and flexible, suitable for small-sized damper structures. It has the characteristics of being compact, reliable, stable, and high-strength.

[0045] In this embodiment or the solution of Embodiment 1, the expansion joint 4 is a metal bellows or other material that is expandable and has a sealing function.

[0046] Preferably, in this embodiment or the scheme of Embodiment 1, the armor rings 42 are sequentially installed around the metal bellows to improve the pressure-bearing capacity of the metal bellows. The function of the armor rings 42 installed on the bellows compensator is to withstand greater pressure on the pipeline, thereby improving the pressure resistance and service life of the bellows compensator.

[0047] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A sealless metallic viscous damper, characterized in that... include: Sleeve (1) for mounting mandrel (2) and accommodating a set of expansion joints (4); The spindle (2) is installed on the top of the sleeve (1) and serves as a channel shaft to provide the telescopic displacement of the connecting rod (3) and to limit the connecting rod (3) to prevent it from deviating. The connecting rod (3) passes through the spindle (2), with one end inside the sleeve (1) and the other end outside the sleeve (1); The telescopic device (4) has two sets, which are respectively installed on both sides of the spindle (2). One set is installed inside the sleeve (1) and the other set is installed outside the sleeve (1), which wraps around the corresponding connecting rod (3) and is fixed at the end to the end of the connecting rod (3), so that the telescopic device (4) and the connecting rod (3) form a sealed inner cavity, and the telescopic device (4) can extend and retract accordingly with the extension and retraction of the connecting rod (3); The damping fluid communication gap is set on the mandrel (2) to connect the two sealed inner cavities; The damping fluid (5) is sealed in the sealed inner cavity of the two sets of expansion joints (4) and flows to each other through the damping fluid communication gap at the mandrel (2). The two ends of the connecting rod (3) are fitted with pressure caps (41). The pressure caps (41) are connected and fixed to the ends of the telescopic device (4) through the end caps, so that the telescopic device (4) can extend and retract accordingly with the extension and retraction of the connecting rod (3), squeezing or expanding the volume of the damping fluid (5). The mandrel (2) includes a mandrel sleeve (21), which is an annular sleeve with an upper cover plate (22) and a lower cover plate (23) installed at both ends. The mandrel sleeve (21) is fitted on the outer side of the middle part of the connecting rod (3) and can restrict the circumferential displacement of the connecting rod (3). The damping fluid communication gap is provided on the mandrel sleeve (21); The upper cover plate (22) is installed on the upper end of the spindle sleeve (21) for connecting with the tail of the upper expansion joint (4), and the surface is provided with an upper guide hole (25). The lower cover plate (23) is installed at the lower end of the spindle sleeve (21) for connecting with the tail of the lower expansion joint (4), and the surface is provided with a lower guide hole (27). The damping screw (24) passes through the mandrel sleeve (21) and has a middle guide hole (26). The middle guide hole (26) can connect the upper guide hole (25) and the lower guide hole (27) to form a damping fluid communication gap, which allows the damping fluid (5) to be connected to the sealed inner cavity of the upper and lower expansion joints (4) through the mandrel (2).

2. The unsealed metallic viscous damper according to claim 1, characterized in that, The damping fluid communication gap also includes a gap between the mandrel (2) and the connecting rod (3), the width of which is 0.5~3mm.

3. The unsealed metallic viscous damper according to claim 1, characterized in that, There is a stiffening plate (28) between the upper cover plate (22) and the lower cover plate (23) on the outside of the mandrel sleeve (21).

4. The unsealed metallic viscous damper according to any one of claims 1-3, characterized in that, The expansion joint (4) is a metal bellows.

5. The unsealed metallic viscous damper according to claim 4, characterized in that, It also includes several armor rings (42), which are installed around the metal bellows in sequence to improve the pressure resistance of the metal bellows.

6. The unsealed metallic viscous damper according to claim 1, characterized in that, A connecting lug (43) is installed on the outer end of the pressure cap (41), and a spherical bearing or ball bearing is installed on the connecting lug (43).

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