Prestress-free multistage stress self-resetting rotary viscous damper

Abstract

The invention discloses a prestress-free multistage stress self-resetting rotary viscous damper in the field of energy dissipation and shock absorption, which comprises an outer sleeve internally provided with a cavity, a guide rod capable of linearly moving along the axis direction of the outer sleeve, and a primary spring sleeved outside the guide rod, a first partition plate and a second partition plate are arranged in the outer sleeve to divide the cavity into a first cavity, a second cavity and a third cavity, a second-stage stress mechanism is arranged in the first cavity corresponding to the guide rod, a rotary conversion mechanism is arranged in the second cavity, and a rotary viscous energy dissipation mechanism is arranged in the third cavity. The guide rod penetrates through the outer sleeve and the first partition plate and is fixedly connected with the rotation switching mechanism, one end of the first-level spring is connected with the first partition plate, and the other end of the first-level spring is connected with the rotation switching mechanism which is used for converting linear motion of the guide rod into rotation motion to be output. The rotary viscous energy dissipation mechanism is used for dissipating energy generated by the input end of the rotary viscous energy dissipation mechanism due to rotary motion. The anti-seismic self-resetting device has symmetrical tensile and compressive properties, and can realize self-resetting after an earthquake.

Description

Technical Field

[0001] The invention belongs to the technical field of energy dissipation and vibration reduction, and in particular relates to a prestress-free multi-stage force-bearing self-resetting rotary viscous damper. Background Art

[0002] Viscous dampers are an important energy dissipation and shock absorption device that can dissipate the energy input into the structure through the damping medium, thereby reducing structural damage and protecting personnel safety. They are widely used in the field of civil engineering and have good development prospects. Viscous dampers are mainly single-rod and double-rod. The single-rod viscous damper has a simple structure, but its structural defects will lead to uneven tension and pressure, and the piston will also "lock" or "vacuum" phenomenon, affecting the energy dissipation effect. The double-rod viscous damper overcomes the shortcomings of the single-rod damper by adding oil replenishment and pressure control devices, but the structure is complex and the space size of the damper is large. In recent years, as the concept of engineering seismic resistance continues to develop towards emphasizing post-earthquake recoverability, the existing viscous dampers have been difficult to adapt to the development trend of dampers due to the lack of post-earthquake self-reset mechanism, and performance upgrades are urgently needed. In addition, most of the existing dampers only have single-stage force performance and lack stiffness and energy dissipation supplement mechanisms to cope with strong earthquakes. Summary of the invention

[0003] The purpose of the present invention is to provide a prestress-free multi-stage force-bearing self-resetting rotary viscous damper, which has symmetrical tension and compression performance, can achieve self-resetting after an earthquake, and helps to further improve the seismic performance of engineering structures.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a prestress-free multi-stage force-bearing self-resetting rotary viscous damper, comprising an outer sleeve with an inner cavity, a guide rod capable of linear motion along the axial direction of the outer sleeve, and a primary spring sleeved outside the guide rod, the outer sleeve is provided with a first partition and a second partition to divide the cavity into a first cavity, a second cavity and a third cavity, the first cavity is provided with a secondary force-bearing mechanism corresponding to the guide rod, the second cavity is provided with a rotation conversion mechanism, the third cavity is provided with a rotation viscous energy dissipation mechanism, the guide rod passes through the outer sleeve and the first partition and is fixedly connected to the rotation conversion mechanism, one end of the primary spring is connected to the first partition, and the other end is connected to the rotation conversion mechanism, the rotation conversion mechanism is used to convert the linear motion of the guide rod into a rotational motion output, and the rotational viscous energy dissipation mechanism is used to dissipate the energy generated by the rotational motion at its input end.

[0005] Compared with the prior art, the present invention has the following beneficial effects: 1. Compared with the single-rod viscous damper, the present invention avoids the "deadlock" and "vacuum" phenomena and has symmetrical tensile and compressive performance; compared with the double-rod viscous damper, the present invention can achieve symmetrical tensile and compressive performance without the need to set up oil replenishment and pressure control devices, and has advantages in simple structure and space size.

[0006] 2. Compared with traditional viscous dampers, the present invention has a post-earthquake self-reset function, which can help engineering structures return to their original position after an earthquake. At the same time, there is no need to apply prestress, and there is no problem of prestress loss.

[0007] 3. By setting up a secondary force-bearing structure, the damper has multi-level force-bearing performance; when encountering a small earthquake or light vibration, only the rotary viscous energy dissipation mechanism works to dissipate the energy input by the earthquake; when encountering a large earthquake or strong vibration, the activated secondary force-bearing structure can further improve the stiffness and energy dissipation capacity of the damper.

[0008] As a further improvement of the technical solution of the present invention, the secondary force-bearing mechanism includes a variable-section cylinder with an annular groove, a left push plate, a left baffle, a secondary spring, a right baffle and a right push plate which are sequentially sleeved on the outer periphery of the guide rod, the left push plate and the right push plate are fixed on the guide rod and can pass through the variable-section cylinder, the annular groove is used to accommodate the left baffle, the secondary spring and the right baffle, the left baffle, the secondary spring and the right baffle can slide relative to the guide rod, the left baffle contacts the inner wall of the annular groove on the left side, and the right side abuts against the left end of the secondary spring, the left side of the right baffle abuts against the right end of the secondary spring, and the right side abuts against the inner wall of the annular groove. The variable-section cylinder coaxially arranged with the guide rod and the outer sleeve can maximize the utilization of the space of the first cavity, and can also limit the guide rod, the left baffle, the secondary spring and the right baffle to always move along the axis direction of the outer sleeve, ensuring that the secondary spring plays the maximum effect.

[0009] As a further improvement of the technical solution of the present invention, the primary spring is an ordinary spring, and the secondary spring is an annular spring. By using an ordinary spring as the primary spring, a highly reliable primary force-bearing structure is realized at a relatively low cost, and by using an annular spring as the secondary spring, when the force is applied, the inner outer ring and the inner ring cooperate with the conical surface to slide relative to each other, and a large friction force is generated on the contact surface, which can further supplement the energy dissipation capacity of the rotary viscous energy dissipation mechanism.

[0010] As a further improvement of the technical solution of the present invention, the length of the annular groove is the sum of the length of the secondary spring and the thickness of the left baffle and the right baffle, which can ensure that in the initial state, the secondary force-bearing mechanism is in an inactive state, and the primary spring is firstly subjected to force to assist the guide rod in achieving the reset function.

[0011] As a further improvement of the technical solution of the present invention, when the secondary spring is in a free length state, there is a spacing between the left baffle plate and the left push plate, and between the right baffle plate and the right push plate. This spacing determines when the secondary force-bearing structure starts to work, and can be flexibly limited according to the force requirements.

[0012] As a further improvement of the technical solution of the present invention, the rotation conversion mechanism includes a rotating cylinder and an open cylinder connected to the end of the guide rod, a plurality of T-shaped pins are arranged at the opening of the open cylinder, an S-shaped groove is opened on the outer circumference of the rotating cylinder, and the ends of the plurality of T-shaped pins are inserted into the S-shaped groove and slidably connected to the inner wall thereof, the end of the rotating cylinder is coaxially arranged with the rotational viscous energy dissipation mechanism through a large rotating shaft, the large rotating shaft is rotatably arranged in a supporting sleeve, and the supporting sleeve passes through the second baffle and is fixedly connected thereto. The coaxially arranged open cylinder and rotating cylinder can ensure the stability of the damper when subjected to axial force, and the relative sliding of the S-shaped groove and the T-shaped pin can ensure the smoothness of the conversion from linear operation to rotational motion.

[0013] As a further improvement of the technical solution of the present invention, the rotary viscous energy dissipation mechanism includes a small rotating shaft and a sealing cylinder, the input end of the small rotating shaft is coaxially arranged with the rotary conversion mechanism, a plurality of paddles are arranged on the outer periphery of the output end, the paddles are covered with throttle holes, and the sealing cylinder can accommodate a plurality of paddles and is filled with viscous damping medium. Due to its own viscosity, the damping medium will encounter resistance when passing through the throttle holes on the paddles, so that the external input energy is dissipated.

[0014] As a further improvement of the technical solution of the present invention, a plurality of the paddles are arranged in a wheel-like manner on the outer periphery of the small rotating shaft, and a sealing strip is provided on the outer edge of the paddle, and the outer side of the sealing strip is in contact with the inner wall of the sealing cylinder. The gap is blocked to prevent the damping medium from leaking from the outer edge of the paddle, maintain its damping performance and improve the energy consumption of the rotary viscous energy dissipation mechanism, thereby improving the overall energy consumption effect of the damper.

[0015] As a further improvement of the technical solution of the present invention, the throttle hole is a circular structure, which can ensure the high-precision throttling effect and convenient processing of the throttle hole.

[0016] As a further improvement of the technical solution of the present invention, a first connecting piece is arranged at the outward end of the guide rod, and a second connecting piece is arranged at the end of the outer sleeve away from the first connecting piece, so as to realize rapid fixing of the damper to the engineering structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a preferred embodiment of the present invention.

[0018] Figure 2 It is a cross-sectional view of the variable cross-section cylinder of the present invention.

[0019] Figure 3It is a partial structural schematic diagram of the secondary force-bearing mechanism of the present invention.

[0020] Figure 4 It is an exploded view of the rotation conversion mechanism of the present invention.

[0021] Figure 5 It is an exploded view of the rotary viscous energy dissipation mechanism of the present invention.

[0022] Among them, 1 is a first connecting member, 2 is a left end plate, 3 is an outer sleeve, 4 is a first partition, 5 is a second partition, 6 is a guide rod, 7 is a variable-section cylinder, 8 is a left push plate, 9 is a right push plate, 10 is a left baffle, 11 is a right baffle, 12 is an annular spring, 13 is a common spring, 14 is an open cylinder, 15 is a rotating cylinder, 16 is an S-shaped groove, 17 is a T-shaped pin, 18 is a supporting sleeve, 19 is a large rotating shaft, 20 is a small rotating shaft, 21 is a sealing cylinder, 22 is a paddle, 23 is a sealing strip, 24 is a second connecting member, and 25 is an annular groove. DETAILED DESCRIPTION

[0023] like Figure 1 As shown, a prestress-free multi-stage force-bearing self-resetting rotary viscous damper comprises an outer sleeve 3 with an inner cavity, a guide rod 6 capable of linear motion along the axial direction of the outer sleeve 3, and a primary spring sleeved on the outside of the guide rod 6; a first partition plate 4 and a second partition plate 5 are arranged in the outer sleeve 3 to divide the cavity into a first cavity, a second cavity and a third cavity; the first partition plate 4 and the second partition plate 5 are both annular structures and have a certain thickness, and are fixed to the outer sleeve 3, so as to ensure that they have strong rigidity when subjected to force and are not easily deformed; a secondary force-bearing mechanism is arranged in the first cavity corresponding to the guide rod 6, and a second force-bearing mechanism is arranged in the second cavity corresponding to the guide rod 6. A rotation conversion mechanism is arranged in the cavity, and a rotation viscous energy dissipation mechanism is arranged in the third cavity; a first connecting member 1 is arranged at the outward end of the guide rod 6, and the other end passes through the left end plate 2 and the first partition plate 4 of the outer sleeve 3 and is fixedly connected to the rotation conversion mechanism; one end of the primary spring is fixedly connected to the first partition plate 4, and the other end is fixedly connected to the rotation conversion mechanism; a second connecting member 24 is arranged at the end of the outer sleeve 3 away from the first connecting member 1; the rotation conversion mechanism is used to convert the linear motion of the guide rod 6 into a rotational motion output, and the rotation viscous energy dissipation mechanism is used to dissipate the energy generated by the rotational motion at its input end.

[0024] The secondary force-bearing mechanism is a supplementary mechanism for stiffness enhancement and energy dissipation enhancement. Figure 2 and 3The two-stage force-bearing mechanism comprises a variable-section cylinder 7 with an annular groove 25 therein, a left push plate 8, a left baffle 10, a secondary spring, a right baffle 11 and a right push plate 9 which are sequentially sleeved on the outer periphery of the guide rod 6, the two ends of the variable-section cylinder 7 are respectively fixed to the left end plate 2 and the first partition plate 4 of the outer sleeve 3, the left push plate 8 and the right push plate 9 are fixed to the guide rod 6 and can pass through the variable-section cylinder 7, the annular groove 25 is used to accommodate the left baffle 10, the secondary spring and the right baffle 11, the left baffle 10, the secondary spring and the right baffle 11 can slide relative to the guide rod 6, and the annular groove 25 is used to accommodate the left baffle 10, the secondary spring and the right baffle 11. The length of 5 is the sum of the length of the secondary spring and the thickness of the left baffle 10 and the right baffle 11, which can ensure that when the secondary spring is in a free length state, the left side of the left baffle 10 contacts the inner wall of the annular groove 25, and the right side abuts against the left end of the secondary spring, the left side of the right baffle 11 abuts against the right end of the secondary spring, and the right side abuts against the inner wall of the annular groove 25. There is a spacing between the left baffle 10 and the left push plate 8, and between the right baffle 11 and the right push plate 9. The spacing determines when the secondary force mechanism is activated to start working (such as in a large earthquake or strong vibration), and can be flexibly selected according to the force requirements.

[0025] Preferably, the primary spring is an ordinary spring 13, and the secondary spring is an annular spring 12; the ordinary spring 13 is arranged axially along the guide rod 6, and this arrangement has direct force transmission and high efficiency, and is more conducive to assisting the guide rod 6 to reset; the annular spring 12 is composed of a plurality of conical inner and outer rings. After the secondary force-bearing mechanism is activated, the annular spring 12 can generate a large friction force through the relative sliding of the inner and outer rings under the action of the axial load, thereby consuming a large amount of energy, thereby assisting the rotary viscous energy dissipation mechanism to further enhance the energy dissipation capacity of the damper.

[0026] In this embodiment, the rotary conversion mechanism includes a rotating drum 15 and an open cylinder 14 coaxially connected to the end of the guide rod 6. Two T-shaped pins are arranged at the opening of the open cylinder 14. An S-shaped groove is opened on the outer periphery of the rotating drum 15. The ends of the two T-shaped pins are inserted into the S-shaped groove and slidably connected to the inner wall thereof. The end of the rotating drum 15 is coaxially arranged with the rotary viscous energy dissipation mechanism through a large rotating shaft 19. The large rotating shaft 19 is rotatably arranged in a supporting sleeve 18. The supporting sleeve 18 passes through the second partition plate 5 and is fixedly connected thereto. Figure 4 shown.

[0027] like Figure 5As shown, the rotary viscous energy dissipation mechanism includes a small rotating shaft 20 and a sealing cylinder 21. The input end of the small rotating shaft 20 is coaxially arranged with the rotary conversion mechanism, and four paddle plates 22 arranged in a wheel-like manner are arranged on the outer periphery of the output end. A plurality of throttling holes are arranged on the paddle plates 22. The sealing cylinder 21 can accommodate four paddle plates 22 and is filled with viscous damping medium. The right end face thereof is fixedly connected to the inner wall of the outer sleeve 3. When the paddle plates 22 rotate, the damping fluid passes through the throttling holes to generate damping, and the energy input by the earthquake is dissipated by the fluid damping effect. In order to prevent the damping medium from leaking from the outer edge of the paddle plates 22, maintain its damping performance and improve the energy consumption of the rotary viscous energy dissipation mechanism, a sealing strip 23 is arranged on the outer edge of the paddle plates 22, so that the outer side of the sealing strip 23 is in contact with the inner wall of the sealing cylinder 21, and the throttling hole is designed as a circular structure to further enhance its throttling effect.

[0028] The working process and principle of the present invention are as follows: 1. Suffering from small earthquakes or vibrations of relatively low intensity 1. Tension (guide rod 6 moves to the left) 1.1 Loading Assuming that the second connecting member 24 is fixed, the first connecting member 1 is pulled to the left, and the damper is in a tension state. The guide rod 6 drives the left push plate 8 and the right push plate 9 to move to the left together, but because there is a certain distance between the right push plate 9 and the right baffle 11, at this stage, the right push plate 9 is constantly approaching the right baffle 11 but cannot contact it, so the annular spring 12 is not subjected to force and is not compressed. At the same time, the guide rod 6 also pulls the open cylinder 14 to move to the left, the ordinary spring 13 is constantly compressed, and the restoring force is constantly enhanced; the T-shaped pin squeezes the S-shaped groove, thereby driving the rotating cylinder 15, the large rotating shaft 19, the small rotating shaft 20 and the paddle 22 to rotate. In this state, the viscous damping medium encounters resistance when passing through the circular hole due to the rotation of the paddle 22, exerting the fluid damping effect, dissipating the external input energy, and protecting the damper and its engineering structure.

[0029] 1.2 Uninstall When unloading, the external force is removed. Since the ordinary spring 13 is in a compressed state and has a tendency to recover to the free length, it will push the guide rod 6 and the open cylinder 14 to move to the right until they return to their original position. In this process, the T-shaped pin squeezes the S-shaped groove and drives the rotating cylinder 15, the large rotating shaft 19, the small rotating shaft 20 and the paddle 22 to rotate in the opposite direction to the loading direction. The viscous damping medium passes through the circular hole and exerts the fluid damping effect to dissipate energy.

[0030] 2. Under pressure (guide rod 6 moves to the right) 2.1 Loading Assuming that the second connecting member 24 is fixed and pushes the first connecting member 1 to the right, the damper is in a compressed state. The working principle of the damper in the compressed state is the same as that in the tensile state, but the movement direction is opposite. In brief, the guide rod 6 drives the left push plate 8, the right push plate 9, and the open cylinder 14 to move to the right, the ordinary spring 13 is continuously stretched, and the T-shaped pin squeezes the S-shaped groove, thereby driving the rotating cylinder 15, the large rotating shaft 19, the small rotating shaft 20 and the paddle 22 to rotate in the opposite direction to the tensile state, and the viscous damping medium passes through the circular hole to exert the fluid damping effect to dissipate energy.

[0031] 2.2 Uninstall When unloading, the external force is removed. Since the ordinary spring 13 is in a stretched state and has a tendency to recover to the free length, it will pull the guide rod 6 and the open cylinder 14 to move to the left until they return to their original position. In this process, the T-shaped pin squeezes the S-shaped groove and drives the rotating cylinder 15, the large rotating shaft 19, the small rotating shaft 20 and the paddle 22 to rotate in the opposite direction to the loading direction. The viscous damping medium passes through the circular hole and exerts the fluid damping effect to dissipate energy.

[0032] (ii) Suffering from a major earthquake or relatively strong vibration When the damper is subjected to a large earthquake or high-intensity vibration, whether in the loading or unloading stage, it will retain the entire working process and energy dissipation capacity when subjected to a small earthquake or low-intensity vibration, and on this basis, the function of the secondary force-bearing structure will be added. Therefore, the following only briefly introduces the working process and working principle of the secondary force-bearing mechanism.

[0033] Taking the tension of the damper as an example, when it is subjected to a large earthquake or a relatively strong vibration, the guide rod 6 drives the left push plate 8 and the right push plate 9 to move to the left together until the right push plate 9 and the right baffle plate 11 come into contact. If the loading continues, the annular spring 12 will be squeezed and deformed by the right push plate 9, and the secondary force-bearing mechanism will be activated. In this state, since the annular spring 12 begins to bear the load, the stiffness of the damper is enhanced; if the loading continues, the compression of the annular spring 12 continues to increase, so the restoring force continues to increase; at the same time, inside the annular spring 12, the outer ring and the inner ring slide relative to each other with the conical surface, and the contact surface generates a large friction force. The damper uses the friction mechanism to further enhance its energy dissipation capacity. When unloading, the annular spring 12 can automatically return to its original state according to its own characteristics, accompanied by a certain amount of energy dissipation.

[0034] When the damper is compressed, the annular spring 12 is squeezed by the left push plate 8. Its working principle and force state are consistent with the tension state of the damper, only the movement direction is opposite, which is omitted here.

[0035] In summary, the present invention converts the linear motion of the guide rod 6 into the circular motion of the paddle plate 22 through a rotation conversion structure, and utilizes the fluid damping effect formed by the damping medium passing through the circular hole to dissipate energy. Therefore, the tension and compression motion will only change the direction of rotation, thus overcoming the vacuum or deadlock phenomenon of the single-rod damper, and the tension and pressure are symmetrical; at the same time, it also avoids the complex structure of the double-rod damper that requires the addition of oil replenishment and pressure control devices. The secondary force-bearing mechanism can be activated when the damper is subjected to a large earthquake or high-intensity vibration, and plays a role in increasing stiffness and enhancing energy dissipation. In addition, the damper realizes the self-reset function after the earthquake by setting a primary spring and a secondary spring.

[0036] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A prestress-free multi-stage force-bearing self-resetting rotary viscous damper, characterized in that: It includes an outer sleeve with a cavity inside, a guide rod that can make linear motion along the axis direction of the outer sleeve and a primary spring sleeved outside the guide rod, the outer sleeve is provided with a first partition and a second partition to divide the cavity into a first cavity, a second cavity and a third cavity, the first cavity is provided with a secondary force-bearing mechanism corresponding to the guide rod, the second cavity is provided with a rotation conversion mechanism, the third cavity is provided with a rotational viscous energy dissipation mechanism, the guide rod passes through the outer sleeve and the first partition and is fixedly connected to the rotation conversion mechanism, one end of the primary spring is connected to the first partition, and the other end is connected to the rotation conversion mechanism, the rotation conversion mechanism is used to convert the linear motion of the guide rod into a rotational motion output, and the rotational viscous energy dissipation mechanism is used to dissipate the energy generated by the rotational motion at its input end.

2. The prestress-free multi-stage force-bearing self-resetting rotary viscous damper according to claim 1 is characterized in that: The secondary force-bearing mechanism includes a variable-section cylinder with an annular groove therein, a left push plate, a left baffle, a secondary spring, a right baffle and a right push plate which are sequentially sleeved on the outer periphery of the guide rod, the left push plate and the right push plate are fixed on the guide rod and can pass through the variable-section cylinder, the annular groove is used to accommodate the left baffle, the secondary spring and the right baffle, the left baffle, the secondary spring and the right baffle can slide relative to the guide rod, the left side of the left baffle contacts the inner wall of the annular groove, and the right side contacts the left end of the secondary spring, the left side of the right baffle contacts the right end of the secondary spring, and the right side contacts the inner wall of the annular groove.

3. The prestress-free multi-stage force-bearing self-resetting rotary viscous damper according to claim 2 is characterized in that: The primary spring is a common spring, and the secondary spring is an annular spring.

4. The prestress-free multi-stage force-bearing self-resetting rotary viscous damper according to claim 2 is characterized in that: The length of the annular groove is the sum of the length of the secondary spring and the thickness of the left baffle plate and the right baffle plate.

5. The prestress-free multi-stage force-bearing self-resetting rotary viscous damper according to claim 2 is characterized in that: When the secondary spring is in a free length state, there is a gap between the left baffle plate and the left push plate, and between the right baffle plate and the right push plate.

6. The prestress-free multi-stage force-bearing self-resetting rotary viscous damper according to claim 1 is characterized in that: The rotation conversion mechanism includes a rotating cylinder and an open cylinder connected to the end of the guide rod, a plurality of T-shaped pins are arranged at the opening of the open cylinder, an S-shaped groove is opened on the outer circumference of the rotating cylinder, the ends of the plurality of T-shaped pins are extended into the S-shaped groove and are slidably connected to the inner wall thereof, the end of the rotating cylinder is coaxially arranged with the rotational viscous energy dissipation mechanism through a large rotating shaft, the large rotating shaft is rotatably arranged in a supporting sleeve, and the supporting sleeve passes through the second baffle and is fixedly connected to it.

7. The prestress-free multi-stage force-bearing self-resetting rotary viscous damper according to claim 1 is characterized in that: The rotary viscous energy dissipation mechanism comprises a small rotating shaft and a sealing cylinder. The input end of the small rotating shaft is coaxially arranged with the rotary conversion mechanism, and a plurality of paddle plates are arranged on the periphery of the output end. A plurality of throttling holes are arranged on the paddle plates. The sealing cylinder can accommodate a plurality of paddle plates and is filled with viscous damping medium.

8. The prestress-free multi-stage force-bearing self-resetting rotary viscous damper according to claim 7 is characterized in that: A plurality of paddle boards are arranged in a wheel-like manner on the outer periphery of the small rotating shaft, a sealing strip is arranged on the outer edge of the paddle board, and the outer side of the sealing strip is in contact with the inner wall of the sealing cylinder.

9. The prestress-free multi-stage force-bearing self-resetting rotary viscous damper according to claim 7, characterized in that: The throttling hole is a circular structure.

10. A prestress-free multi-stage force-bearing self-resetting rotary viscous damper according to any one of claims 1 to 9, characterized in that: A first connecting piece is disposed at one end of the guide rod facing outward, and a second connecting piece is disposed at one end of the outer sleeve away from the first connecting piece.

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