Torsional damper based on shear thickening fluid

Abstract

The utility model discloses a torsional damper based on shear thickening fluid, which comprises a sleeve connecting piece used for being connected with a target vibration reduction component; the transmission component is used for converting vertical vibration of the target vibration reduction component on the sleeve connecting piece into rotation of a gear rotor and can reset the position of the sleeve connecting piece; the upper end cover is used for being connected with a transmission component, the upper end cover, the middle cabin and the lower end cover form a closed cavity, and the cavity is filled with shear thickening liquid; a shearing gap is formed between the gear rotor and the middle cabin, and the gear rotor is used for shearing and extruding the shear thickening fluid under the driving of the transmission component, increasing the viscosity of the shear thickening fluid and absorbing and consuming the energy of the target vibration reduction component. According to the passive damper, the advantage that shear thickening fluid rapidly consumes structural vibration energy in a high-speed mode is utilized, and the number of gear rotors can be adjusted according to actual use requirements.

Description

Technical Field

[0001] The utility model relates to the design of a damping device, belongs to the technical field of vibration reduction devices, and specifically relates to a torsion damper based on a shear thickening fluid. Background Art

[0002] Vibration is a common phenomenon in nature. While it brings convenience to human life, it also creates many hazards. Therefore, in order to reduce the harm caused by vibration, people use dampers to convert the mechanical energy generated by the vibration process into internal energy, thereby reducing the vibration and impact of the structure.

[0003] Dampers are divided into three types: passive dampers that use a certain state-fixed energy-absorbing medium as a vibration-absorbing element, active dampers that use external energy to directly control the force applied to the controlled part to offset the inertial force of the vibration, thereby achieving vibration control, and semi-active dampers that use a state-controllable energy-absorbing medium as a vibration-absorbing element. Comparing the three vibration control methods, active vibration control and semi-active control methods are more effective and can be applied to structures with high vibration control requirements. However, active control and semi-active control devices have more components, and energy input needs to be guaranteed during use, so the installation space and travel are limited. In addition, the effectiveness of the actuator in the active control system is difficult to control in a long-term non-actuated state, and the reliability in harsh environments is difficult to guarantee. The use and maintenance costs are also relatively high. These defects limit the large-scale application of active and semi-active control in actual engineering. Compared with active control and semi-active control, passive control mainly relies on the inherent properties of the material to absorb and dissipate energy, does not require additional energy input and signal acquisition systems, and has the advantages of simple structure, stable performance and clear energy dissipation capacity.

[0004] Shear thickening fluid (STF) is a new type of functional material. At low shear rates, it will show a small viscosity. When the shear rate exceeds its critical shear rate, thickening occurs and its viscosity increases rapidly. When the shear rate is high, the viscosity reaches dozens of times that at low shear rates, and even the material itself will become solid-like. When the external force is removed, the suspension can return to liquid in a short time, and this conversion process does not require additional stimulation. There will be no solid-like damage after impact, and no repair is required, so it can be reused many times.

[0005] The most widely used damper at present is the cylinder viscous damper. According to the different structures of the piston rod, the cylinder viscous damper is divided into two categories: single-rod viscous damper and double-rod viscous damper. According to the different structures of the energy-absorbing components on the piston, it is divided into three types: pore type, gap type, and combined type. The damping force output of the traditional damper is limited by its main structural dimensions, so it is only suitable for vibration shocks within a specific range. The research on shear thickening fluid dampers is mostly focused on applying shear thickening fluid to piston dampers, which does not fully utilize its material properties, especially the amplification effect at high shear rates. Utility Model Content

[0006] The utility model aims to provide a torsion damper based on shear thickening fluid to solve the problems that the traditional damping device does not have its own energy dissipation capacity and the size parameters limit the damping performance, and no external excitation power supply is required.

[0007] The technical solution to achieve the purpose of this utility model is:

[0008] A torsional damper based on a shear thickening fluid, comprising:

[0009] A sleeve connector, used to connect to a target vibration reduction component;

[0010] A transmission member, used to convert the vertical vibration of the target vibration reduction member to the sleeve connecting member into the rotation of the gear rotor, and capable of resetting the position of the sleeve connecting member;

[0011] The upper end cover is used to connect the transmission components and to form a closed cavity with the middle cabin and the lower end cover, and the cavity is filled with a shear thickening fluid;

[0012] A shear gap is arranged between the gear rotor and the intermediate cabin, which is used to shear and squeeze the shear thickening fluid under the drive of the transmission component, increase the viscosity of the shear thickening fluid, and absorb and consume the energy of the target vibration reduction component.

[0013] In a further embodiment, the transmission member includes a nut ball screw pair, a coupling, an intermediate rod bearing, an intermediate rod, and a damping spring;

[0014] The bottom of the sleeve connecting piece is connected to the nut of the nut ball screw pair; one end of the nut ball screw pair extends into the sleeve connecting piece, and the other end is directly connected to the intermediate rod through a coupling; the intermediate rod is installed on the upper end cover through an intermediate rod bearing 6, and a gear rotor is connected to the lower part of the intermediate rod; the damping spring surrounds the screw of the nut ball screw pair, one end contacts the nut of the nut ball screw pair, and the other end contacts the coupling housing, and the coupling housing is fixed on the upper end cover.

[0015] In a further embodiment, the intermediate rod bearing is a single row angular contact ball bearing.

[0016] In a further embodiment, the gear rotor is a C-shaped helical gear with an opening angle between 130° and 160°.

[0017] In a further embodiment, the shear gap between the gear rotor and the intermediate cabin is 2 to 12 mm.

[0018] In a further embodiment, the lower end cover is provided with an annular step, the annular step has a rectangular groove with an O-ring, and the lower end of the intermediate cabin is sealed with the lower end cover by the O-ring.

[0019] Compared with the prior art, the utility model has the following significant advantages:

[0020] The technical solution of the utility model combines the advantages of shear thickening liquid, alloy damping spring, ball screw and gear rotor, and has excellent energy dissipation properties; the device uses a ball screw device to convert the translation of the target damping component into the rotation of the screw, thereby driving the rotation of the intermediate rod and the gear rotor, and uses the shear force between the gear rotor and the intermediate cabin to shear thicken the shear thickening liquid, thereby realizing the damping energy dissipation of the damper, and has stable and efficient energy dissipation capacity. The cooperation of the alloy damping spring and the ball screw pair enables the damper to quickly return to the initial state, greatly improving the energy dissipation capacity of the damper. The gear rotor used is a helical gear C-type design with an opening angle between 130° and 160°, which increases the shear area of ​​the shear thickening liquid and gives full play to its high energy dissipation effect. At the same time, a keyway is reserved for the intermediate rod connected to the gear rotor by a key, and the number of gear rotors can be adjusted according to actual use requirements, which solves the problems of limited frequency range and energy dissipation effect of traditional dampers to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the torsional damper of the utility model.

[0022] Figure 2 It is a sectional view of the three-dimensional structure of the torsion damper of the utility model.

[0023] Figure 3 This is a schematic diagram of the gear rotor structure of the torsional damper of the utility model. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Combination Figure 1-Figure 3The utility model includes a sleeve connector 1, a nut ball screw pair 2, an alloy damping spring 3, a coupling 4, a sealing felt A5, an intermediate rod bearing 6, a sealing felt B7, an intermediate rod 8, an upper end cover 9, an intermediate cabin 10, a shear thickening liquid 11, an O-ring 12, a lower end cover 13 and a gear rotor 14; the nut ball screw pair, the coupling, the intermediate rod bearing, the intermediate rod, and the alloy damping spring constitute a transmission component, which is used to convert the vertical vibration (translational motion) of the target damping component on the sleeve connector into the rotation of the gear rotor, and can reset the position of the sleeve connector.

[0026] The sleeve connector 1 is made of steel, and has four M3 threaded holes at the bottom corresponding to the nuts of the nut ball screw pair 2. It is connected to the nuts of the nut ball screw pair 2 by screws, and the top of the sleeve connector 1 is used to be connected to the target vibration reduction component.

[0027] One end of the nut ball screw pair 2 extends into the sleeve connector 1 and can move axially relative to the sleeve connector 1. The other end is directly connected to the intermediate rod 8 through the coupling 4. The intermediate rod 8 is installed on the upper end cover 9 through the intermediate rod bearing 6. The intermediate rod bearing 6 is a single-row angular contact ball bearing, which is directly installed in the bearing groove of the upper end cover 9. Its upper end is restricted by an elastic retaining ring, and its inner circle is transitionally matched with the intermediate rod 8. The inner circle of the sealing felt A5 and the sealing felt B7 is directly in contact with one axial end of the intermediate rod 8, and the whole is interference fit. They are respectively installed in the coupling housing and the groove of the upper end cover 9. The lower part of the intermediate rod 8 is connected to the gear rotor 14.

[0028] The alloy damping spring 3 surrounds the screw of the nut ball screw pair 2, one end of which is in rigid contact with the nut boss of the nut ball screw pair 2, and the other end of which is in contact with the coupling housing, which is fixed on the upper end cover 9.

[0029] The upper end cover 9 is provided with through holes in the circumference, and is threadedly connected to the middle cabin 10 with six threaded holes in the circumference on the top by screws. The flange of the middle cabin 10 is connected to the upper end of the lower end cover 13 by screws, and the lower end cover 13 is provided with an annular step, and the annular step is provided with a rectangular groove with an O-ring 12, and the lower end of the middle cabin 10 is sealed with the lower end cover 13 by the O-ring 12;

[0030] The interior of the intermediate chamber 10 is filled with a shear thickening liquid 11 , which fills the gaps between the gear rotor 14 and the intermediate chamber 10 , the upper end cover 9 , and the lower end cover 13 .

[0031] Two keyways are provided at the second step shaft at the bottom end of the intermediate rod 8 and the first step shaft at the bottom end is fully threaded. The tooth profile of the gear rotor 14 is a helical gear C-type design and the opening angle is between 130° and 160°. It is connected to the intermediate rod 8 by a key. One side of the gear rotor 14 contacts the shaft shoulder of the intermediate rod 8, and the other side contacts the nut pre-tightened on the intermediate rod 8.

[0032] There is a shear gap of 2 to 12 mm between the gear rotor 14 and the inner wall of the intermediate cabin 10; when the target vibration reduction component vibrates, the screw of the nut ball screw pair 2 rotates, and the intermediate rod 8 rotates through the coupling 4, thereby driving the gear rotor 14 to produce a shear and squeeze effect on the internal shear thickening liquid 11. As the shear rate increases, the viscosity of the shear thickening liquid 11 increases rapidly, absorbing and consuming the energy of the target vibration reduction component, thereby realizing the anti-impact vibration isolation of the engineering structure. The number of gear rotors can be adjusted according to actual use requirements.

[0033] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] Although the embodiments of the present invention have been shown and described, a person skilled in the art in the technical field to which the present invention belongs may make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A torsional damper based on a shear thickening fluid, characterized in that: include: A sleeve connector, used to connect to a target vibration reduction component; A transmission member, used to convert the vertical vibration of the target vibration reduction member to the sleeve connecting member into the rotation of the gear rotor, and capable of resetting the position of the sleeve connecting member; The upper end cover is used to connect the transmission components and to form a closed cavity with the middle cabin and the lower end cover, and the cavity is filled with a shear thickening fluid; A shear gap is arranged between the gear rotor and the intermediate cabin, which is used to shear and squeeze the shear thickening fluid under the drive of the transmission component, increase the viscosity of the shear thickening fluid, and absorb and consume the energy of the target vibration reduction component.

2. The torsional damper based on shear thickening fluid according to claim 1, characterized in that: The transmission component includes a nut ball screw pair, a coupling, an intermediate rod bearing, an intermediate rod, and a damping spring; The bottom of the sleeve connecting piece is connected to the nut of the nut ball screw pair; one end of the nut ball screw pair extends into the sleeve connecting piece, and the other end is directly connected to the intermediate rod through a coupling; the intermediate rod is installed on the upper end cover through an intermediate rod bearing, and a gear rotor is connected to the lower part of the intermediate rod; the damping spring surrounds the screw of the nut ball screw pair, one end contacts the nut of the nut ball screw pair, and the other end contacts the coupling housing, and the coupling housing is fixed on the upper end cover.

3. The torsional damper based on shear thickening fluid according to claim 2, characterized in that: The intermediate rod bearing is a single-row angular contact ball bearing.

4. The torsional damper based on shear thickening fluid according to claim 1, characterized in that: The gear rotor is a C-shaped helical gear with an opening angle between 130° and 160°.

5. The torsional damper based on shear thickening fluid according to claim 1, characterized in that: The shear gap between the gear rotor and the intermediate cabin is 2 to 12 mm.

6. The torsional damper based on shear thickening fluid according to claim 1, characterized in that: The lower end cover is provided with an annular step, and a rectangular groove with an O-ring is opened on the annular step. The lower end of the intermediate cabin is sealed with the lower end cover through the O-ring.

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