An inertial damper based on shear thickening liquid

Abstract

The present invention relates to an inertial damper based on shear thickening liquid, belonging to the technical field of vibration reduction devices, comprising an outer sleeve and a first end cap and a second end cap respectively covering the two ends of the outer sleeve, a sleeve being rotatably connected between the first end cap and the second end cap, a screw shaft being arranged through the sleeve with internal threads matching, the two ends of the screw shaft respectively passing through the first end cap and the second end cap and extending out of the outer sleeve, a first connecting terminal being installed at one end of the screw shaft close to the first end cap, a second connecting terminal being installed at the side of the second end cap away from the first end cap, and the second connecting terminal being covered outside the screw shaft. This inertial damper based on shear thickening liquid can realize three-level real-time adjustment of the inertia coefficient and the damping coefficient in the damper, and is a passive damper with adjustable damping force and no need for power or magnetization.

Description

Technical Field

[0001] The invention relates to the technical field of vibration damping devices, and in particular to an inertial damper based on shear thickening liquid. Background Art

[0002] With the continuous development of science and technology, the harm caused by vibration is becoming more and more serious. Dampers have become one of the main measures to suppress vibrations due to their high energy consumption and easy installation. Among the many dampers, liquid viscous dampers, as a common damping device, have many advantages, such as high energy consumption, high efficiency, compact structure, small installation space, long service life, stable performance, etc., and are widely used in various fields to reduce harmful vibrations. Liquid viscous dampers are a velocity-related energy dissipation device that mainly uses the viscosity of the liquid to provide damping to dissipate vibration energy. It is a passive velocity-type energy dissipation and vibration reduction device with viscous materials as damping media. However, since the damping performance of the liquid viscous damper is determined by the viscosity of the liquid, it is a passive damper, and the damping force it generates does not have the ability to be adjusted, which seriously restricts its development and application.

[0003] At present, in order to meet various complex shock (vibration) requirements, it is urgent to study inertial dampers with adjustable damping inertia. Some existing inertial dampers with adjustable damping inertia have very complex structures, and most of them need to be powered or magnetized, which are expensive. Therefore, there is an urgent need for a new type of damper with a simple structure, easy installation, low cost, adjustable damping force, and no need for power or magnetization. Summary of the invention

[0004] The present invention aims to provide an inertial damper based on shear thickening liquid to solve the problems raised in the above background technology.

[0005] The above-mentioned inventive object of the present invention is achieved through the following technical scheme: an inertial damper based on shear thickening liquid comprises an outer sleeve and a first end cover and a second end cover respectively covering the two ends of the outer sleeve, a sleeve is rotatably connected between the first end cover and the second end cover, the inner thread of the sleeve is matched and a screw shaft is arranged through it, the two ends of the screw shaft respectively pass through the first end cover and the second end cover and extend out of the outer sleeve, a first connecting terminal is installed at one end of the screw shaft close to the first end cover, a second connecting terminal is installed at the side of the second end cover away from the first end cover, the second connecting terminal is covered outside the screw shaft, a volume compensation chamber is formed between the two, and a second connecting terminal which does not contact each other is strung on the sleeve. A driven shear plate, an active shear plate and a second driven shear plate, wherein the first driven shear plate and the second driven shear plate are symmetrically arranged on both sides of the active shear plate, wherein the active shear plate is fixedly connected to the sleeve, and the first driven shear plate and the second driven shear plate are both rotatably connected to the sleeve, and the active shear plate divides the interior of the outer sleeve into two independent spaces, and the two spaces are respectively filled with a second shear thickening liquid and a first shear thickening liquid, wherein the first driven shear plate is immersed in the first shear thickening liquid, and the second driven shear plate is immersed in the second shear thickening liquid, and the initial viscosity of the first shear thickening liquid is greater than the initial viscosity of the second shear thickening liquid.

[0006] In some embodiments, a central groove is opened around the sleeve at the center of both sides of the active shear plate, and a plurality of embedding grooves extending radially along the sleeve and arranged in a circular array are opened on both sides of the active shear plate, each of the embedding grooves is connected to the central groove, and the opening depth of the central groove is greater than the opening depth of the embedding groove, and a movable strip plate is hingedly connected to the junction of each embedding groove and the central groove through a hinge seat, one end of the movable strip plate extends into the central groove, and the other end is movably embedded in the embedding groove, and an adjustment tube is threadedly sleeved on the sleeve between the active shear plate and the first driven shear plate and between the active shear plate and the second driven shear plate, and the adjustment tube can be screwed into the central groove and squeeze one end of the movable strip plate, so that the other end of the movable strip plate is tilted outward from the embedding groove.

[0007] In some embodiments, the first end cap and the second end cap are both detachably connected to the outer sleeve.

[0008] In some embodiments, a sealing ring is provided between the active shear plate and the inner wall of the outer sleeve, the inner side of the sealing ring is fixedly connected to the active shear plate, and the outer side is slidably fitted to the inner wall of the outer sleeve.

[0009] In some embodiments, both ends of the sleeve are rotatably connected to the first end cover and the second end cover through a first thrust bearing and a second thrust bearing, respectively.

[0010] In some embodiments, the first driven shear plate and the second driven shear plate are both rotatably connected to the sleeve via a rotating bearing.

[0011] In summary, the present invention has the following beneficial effects:

[0012] The present invention is an inertial damper based on shear thickening liquid. When the shear thickening liquid is stirred, special particles in the liquid collide with each other, thereby forming a resistance to the stirring in the liquid. When the active shear plate rotates in the shear thickening liquid, it can rotate with the driven shear plate. However, since the contact areas between the first and second driven shear plates and the shear thickening liquid are the same, and the initial viscosity of the first shear thickening liquid between the first driven shear plate and the active shear plate is greater than the initial viscosity of the second shear thickening liquid between the second driven shear plate and the active shear plate, the critical shear rate at which the first shear thickening liquid starts to thicken is smaller than that of the second shear thickening liquid, and the first driven shear plate starts to work earlier than the second driven shear plate, thereby realizing three-level real-time adjustment of the inertial volume coefficient and the damping coefficient in the inertial damper. The present invention is a passive damper with adjustable damping force and no need for electricity or magnetism. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a cross-sectional structural diagram of embodiment 1 of the present invention;

[0014] Figure 2 This is an assembly isometric view of the active shear plate, the movable strip plate, the sleeve and the adjustment tube in Example 2 of the present invention (first state);

[0015] Figure 3 It is an assembly cross-sectional view of the active shear plate, the movable strip plate, the sleeve and the adjustment tube in Example 2 of the present invention (first state);

[0016] Figure 4 This is an assembly isometric diagram of the active shear plate, the movable strip plate, the sleeve and the adjustment tube in Example 2 of the present invention (second state);

[0017] Figure 5 It is an assembly cross-sectional view of the active shear plate, the movable strip plate, the sleeve and the adjustment tube in Example 2 of the present invention (second state);

[0018] Figure 6 This is an assembly isometric diagram of the active shear plate, the movable strip plate, the sleeve and the adjustment tube in Example 2 of the present invention (third state);

[0019] Figure 7 It is an assembly cross-sectional view of the active shear plate, the movable strip plate, the sleeve and the adjustment tube in Example 2 of the present invention (third state).

[0020] In the figure: 1, outer sleeve; 2, first end cover; 3, second end cover; 4, first driven shear plate; 5, active shear plate; 501, center groove; 502, embedded groove; 503, movable strip plate; 504, hinge seat; 6, sealing ring; 7, second driven shear plate; 8, second shear thickening liquid; 9, first shear thickening liquid; 10, second thrust bearing; 11, first thrust bearing; 12, rotating bearing; 13, sleeve; 1301, adjusting tube; 14, screw shaft; 15, second connecting terminal; 16, volume compensation chamber; 17, first connecting terminal. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example 1

[0026] Reference Figure 1 , including an outer sleeve 1 and a first end cover 2 and a second end cover 3 respectively covering the two ends of the outer sleeve 1. In order to facilitate maintenance and adjustment of various components in the outer sleeve 1, the first end cover 2 and the second end cover 3 can be detachably connected to the outer sleeve 1. A sleeve 13 is rotatably connected between the first end cover 2 and the second end cover 3. In order to reduce the resistance of the sleeve 13 to rotation, the two ends of the sleeve 13 can be rotatably connected to the first end cover 2 and the second end cover 3 through a first thrust bearing 11 and a second thrust bearing 10 respectively. The sleeve 13 is internally threaded and is penetrated by a screw shaft 14. The two ends of the screw shaft 14 The ends pass through the first end cover 2 and the second end cover 3 respectively and extend out of the outer sleeve 1. The first connecting terminal 17 is installed on the end of the screw shaft 14 close to the first end cover 2, and the second connecting terminal 15 is installed on the side of the second end cover 3 away from the first end cover 2. The second connecting terminal 15 covers the outside of the screw shaft 14, and a volume compensation chamber 16 is formed between the two. When the screw shaft 14 moves in the sleeve 13, under the action of the thread, the axial linear motion of the screw shaft 14 will be converted into the rotational motion of the sleeve 13, and the volume compensation chamber 16 provides sufficient activity space for the screw shaft 14.

[0027] The sleeve 13 is provided with a first driven shear plate 4, an active shear plate 5, and a second driven shear plate 7 which are not in contact with each other. The first driven shear plate 4 and the second driven shear plate 7 are symmetrically arranged on both sides of the active shear plate 5, respectively. The active shear plate 5 is fixedly connected to the sleeve 13, and the first driven shear plate 4 and the second driven shear plate 7 are both rotatably connected to the sleeve 13. The first driven shear plate 4 and the second driven shear plate 7 can be rotatably connected to the sleeve 13 through a rotating bearing 12. The active shear plate 5 divides the interior of the outer sleeve 1 into two independent spaces. A sealing ring 6 can be arranged between the active shear plate 5 and the inner wall of the outer sleeve 1, and the inner side of the sealing ring 6 is fixedly connected to the active shear plate 5, and the outer side is connected to the outer sleeve 1. The inner wall of the sleeve 1 is slidably fitted to ensure that the two spaces are not connected to each other, and the two spaces are respectively filled with the second shear thickening liquid 8 and the first shear thickening liquid 9, wherein the first driven shear plate 4 is immersed in the first shear thickening liquid 9, the second driven shear plate 7 is immersed in the second shear thickening liquid 8, and the two sides of the active shear plate 5 are respectively immersed in the second shear thickening liquid 8 and the first shear thickening liquid 9, and the initial viscosity of the first shear thickening liquid 9 is greater than the initial viscosity of the second shear thickening liquid 8. In addition, preferably, in this embodiment, the outer sleeve 1 is cylindrical, the first end cover 2, the second end cover 3, the active shear plate 5, the first driven shear plate 4 and the second driven shear plate 7 are all disc-shaped, and the sealing ring 6 is annular.

[0028] When a shear thickening liquid is stirred, the special particles in the liquid collide with each other, thus forming a resistance stress to the agitation, which is calculated as follows:

[0029] σ=K*(γ) n

[0030] Wherein, γ is the shear rate (i.e., stirring rate), σ is the resistance stress, K is the viscosity coefficient, and n is the shear flow index of the Newtonian fluid. Since the shear thickening liquid has a certain initial viscosity, the shear thickening liquid has a certain initial resistance stress when it is not stirred. Therefore, the actual resistance stress of the shear thickening liquid is equal to the resistance stress generated when it is stirred plus its initial resistance stress. When the active shear plate 5 rotates, it stirs the shear thickening liquid, thereby causing the shear thickening liquid to generate resistance stress. At this time, the first driven shear plate 4 or the second driven shear plate 7 can be driven to rotate with the help of the actual resistance stress of the shear thickening liquid. In order to drive the first driven shear plate 4 or the second driven shear plate 7 to rotate, the active shear plate 5 must reach different stirring rates (because the initial viscosities of the first shear thickening liquid 9 and the second shear thickening liquid 8 are different). When a certain stirring rate of the active shear plate 5 can just drive the first driven shear plate 4 or the second driven shear plate 7 to rotate, the stirring rate of the active shear plate 5 at this time is called the critical shear rate, and the actual resistance stress generated by the critical shear rate is called the critical resistance stress.

[0031] The smaller the stirring rate of the active shear plate 5, the smaller the actual resistance stress of the shear thickening liquid. When the stirring rate of the active shear plate 5 gradually increases and reaches the critical shear rate, the actual resistance stress of the shear thickening liquid will rapidly increase by dozens or even hundreds of times. The greater the initial viscosity of the shear thickening liquid, the smaller the critical shear rate of the active shear plate 5 must be to achieve the same critical resistance stress. Conversely, the greater the critical shear rate of the active shear plate 5 and the greater the initial viscosity of the shear thickening liquid, the higher the upper limit of the actual resistance stress that can be achieved. Conversely, the lower the upper limit of the actual resistance stress that can be achieved.

[0032] Based on the above content, it can be known that when the shear thickening liquid is stirred, the special particles in the liquid will collide with each other, thereby forming a resistance to such agitation in the liquid, so that the active shear plate 5 can rotate with the driven shear plate when rotating in the shear thickening liquid. However, since the contact areas between the first and second driven shear plates 7 and the shear thickening liquid are the same, and the initial viscosity of the first shear thickening liquid 9 between the first driven shear plate 4 and the active shear plate 5 is greater than the initial viscosity of the second shear thickening liquid 8 between the second driven shear plate 7 and the active shear plate 5, the critical shear rate at which the first shear thickening liquid 9 begins to thicken is smaller than that of the second shear thickening liquid 8, and the first driven shear plate 4 starts working earlier than the second driven shear plate 7, thereby realizing three-level real-time adjustment of the inertial capacity coefficient and the damping coefficient in the inertial damper, which is a passive damper with adjustable damping force and no need for electricity or magnetism.

[0033] Specifically, the screw shaft 14 drives the active shear plate 5 to rotate. When the active shear plate 5 rotates in the shear thickening liquid, the special particles in the shear thickening liquid collide with each other, thereby forming a resistance to this rotation in the liquid, so that the driven shear plate rotates with the active shear plate 5. However, since the initial viscosity of the first shear thickening liquid 9 is greater than that of the second shear thickening liquid 8, the critical shear rate at which the first shear thickening liquid 9 begins to thicken is smaller than that of the second shear thickening liquid 8. When the critical shear rates of the first shear thickening liquid 9 and the second shear thickening liquid 8 are both greater than the rotation rate of the active shear plate 5, the first driven shear plate 4 and the second driven shear plate 7 do not participate in the work. Therefore, the active shear plate 5 is rotated in the shear thickening liquid by the screw shaft 14, thereby providing a first-order inertia coefficient and a first-order damping coefficient.

[0034] The screw shaft 14 drives the active shear plate 5 to rotate. When the active shear plate 5 rotates in the shear thickening liquid, the special particles in the shear thickening liquid collide with each other, thereby forming a resistance to this rotation in the liquid, so that the driven shear plate rotates with the active shear plate 5. However, since the initial viscosity of the first shear thickening liquid 9 is greater than that of the second shear thickening liquid 8, the critical shear rate at which the first shear thickening liquid 9 begins to thicken is smaller than that of the second shear thickening liquid 8. When the rotation rate of the active shear plate 5 is greater than the critical shear rate of the first shear thickening liquid 9 but less than the critical shear rate of the second shear thickening liquid 8, the first driven shear plate 4 starts to work, and the second driven shear plate 7 does not participate in the work. Therefore, the active shear plate 5 and the first driven shear plate 4 are rotated in the shear thickening liquid by the screw shaft 14, thereby providing a secondary inertia coefficient and a secondary damping coefficient.

[0035] The lead screw shaft 14 drives the active shear plate 5 to rotate. When the active shear plate 5 rotates in the shear thickening liquid, the special particles in the shear thickening liquid collide with each other, thereby forming a resistance to this rotation in the liquid, so that the driven shear plate rotates with the active shear plate 5. However, since the initial viscosity of the first shear thickening liquid 9 is greater than that of the second shear thickening liquid 8, the critical shear rate at which the first shear thickening liquid 9 begins to thicken is smaller than that of the second shear thickening liquid 8. When the critical shear rates of the first shear thickening liquid 9 and the second shear thickening liquid 8 are both less than the rotation rate of the active shear plate 5, the first driven shear plate 4 and the second driven shear plate 7 both participate in the work. Therefore, the lead screw shaft 14 drives the active shear plate 5 and the first driven shear plate 4 and the second driven shear plate 7 to rotate in the shear thickening liquid, thereby providing a three-level inertia coefficient and a three-level damping coefficient.

[0036] All of the above situations do not require power or magnetization, and the entire damper has a simple structure, is easy to install and low cost, but can fully meet multi-level requirements.

[0037] Example 2

[0038] Reference Figure 2-7 , which is different from the first embodiment, the center of both sides of the active shear plate 5 of the present embodiment is provided with a central groove 501 around the sleeve 13, and both sides of the active shear plate 5 are also provided with a plurality of embedded grooves 502 extending radially along the sleeve 13 and arranged in a circular array, each embedded groove 502 is connected to the central groove 501, and the opening depth of the central groove 501 is greater than the opening depth of the embedded groove 502, and the junction of each embedded groove 502 and the central groove 501 is hinged with a movable strip 503 through a hinge seat 504, one end of the movable strip 503 extends into the central groove 501, and the other end is movably embedded in the central groove 501. The adjusting tube 1301 is threadedly sleeved on the sleeve 13 between the active shear plate 5 and the first driven shear plate 4 and between the active shear plate 5 and the second driven shear plate 7 into the embedded groove 502. The adjusting tube 1301 can be screwed into the central groove 501 and squeeze one end of the movable strip 503, so that the other end of the movable strip 503 is tilted outward from the embedded groove 502. The weight of the part of the movable strip 503 located in the embedded groove 502 is greater than the weight of the part of the movable strip 503 located in the central groove 501, so as to ensure that the movable strip 503 will not tilt outward from the embedded groove 502 when not squeezed.

[0039] According to the above technical solution, the adjusting tube 1301 can be twisted to control the squeezing of the adjusting tube 1301 on the end of the movable strip 503, thereby controlling the upward bending of the movable strip 503. When the movable strip 503 is completely squeezed to the upward bending state (such as Figure 6 and Figure 7As shown), at this time, the active strip 503 will also shear the shear thickening liquid, thereby generating a corresponding additional resistance stress. At this time, the actual resistance stress of the shear thickening liquid is equal to the resistance stress generated by the active shear plate 5 when stirring, the resistance stress generated by the stirring of a number of active strips 503, and the initial resistance stress of the shear thickening liquid. That is to say, after the active strip 503 is tilted, the critical resistance stress for driving the first driven shear plate 4 or the second driven shear plate 7 to rotate can be reached through a lower stirring rate (that is, the critical shear rate is reduced). At this time, the entire damper is more sensitive to external vibrations, and when the active strip 503 is not tilted (as shown in FIG. Figure 2-5 As shown), at this time, the movable strip 503 will not shear the shear thickening liquid, and the critical shear rate and critical resistance stress of the damper have not changed. Therefore, the upward tilt of the movable strip 503 can be controlled by twisting the adjustment tube 1301, so as to adjust the vibration reduction sensitivity of the damper to meet different vibration reduction requirements.

[0040] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An inertial damper based on a shear thickening liquid, characterized in that: The invention comprises an outer sleeve (1) and a first end cover (2) and a second end cover (3) respectively covering the two ends of the outer sleeve (1); a sleeve (13) is rotatably connected between the first end cover (2) and the second end cover (3); the sleeve (13) is internally threaded and is provided with a lead screw shaft (14); the two ends of the lead screw shaft (14) respectively pass through the first end cover (2) and the second end cover (3) and extend out of the outer sleeve (1); a first connecting terminal (17) is installed at one end of the lead screw shaft (14) close to the first end cover (2); a second connecting terminal (15) is installed at a side of the second end cover (3) away from the first end cover (2); the second connecting terminal (15) is covered outside the lead screw shaft (14), and a volume compensation chamber (16) is formed between the two; The sleeve (13) is provided with a first driven shear plate (4), an active shear plate (5) and a second driven shear plate (7) which are not in contact with each other, the first driven shear plate (4) and the second driven shear plate (7) are symmetrically arranged on both sides of the active shear plate (5), wherein the active shear plate (5) is fixedly connected to the sleeve (13), the first driven shear plate (4) and the second driven shear plate (7) are both rotatably connected to the sleeve (13), the active shear plate (5) divides the interior of the outer sleeve (1) into two independent spaces, the two spaces are respectively filled with a second shear thickening liquid (8) and a first shear thickening liquid (9), wherein the first driven shear plate (4) is immersed in the first shear thickening liquid (9), and the second driven shear plate (7) is immersed in the second shear thickening liquid (8); The initial viscosity of the first shear thickening liquid (9) is greater than the initial viscosity of the second shear thickening liquid (8); a central groove (501) is provided at the center of both sides of the active shear plate (5) around the sleeve (13); both sides of the active shear plate (5) are also provided with a plurality of embedded grooves (502) extending radially along the sleeve (13) and arranged in a ring array, each of the embedded grooves (502) is connected to the central groove (501), and the opening depth of the central groove (501) is greater than the opening depth of the embedded grooves (502); A movable strip (503) is hingedly connected at the junction of each of the embedding grooves (502) and the central groove (501) via a hinge seat (504), one end of the movable strip (503) extends into the central groove (501), and the other end is movably embedded in the embedding groove (502); An adjustment tube (1301) is threadedly sleeved on the sleeve (13) between the active shear plate (5) and the first driven shear plate (4) and between the active shear plate (5) and the second driven shear plate (7); the adjustment tube (1301) can be screwed into the central groove (501) and squeeze one end of the movable strip plate (503), so that the other end of the movable strip plate (503) is tilted outward from the embedding groove (502).

2. An inertial damper based on shear thickening liquid according to claim 1, characterized in that: The first end cover (2) and the second end cover (3) are both detachably connected to the outer sleeve (1).

3. An inertial damper based on shear thickening liquid according to claim 1, characterized in that: A sealing ring (6) is provided between the active shear plate (5) and the inner wall of the outer sleeve (1); the inner side of the sealing ring (6) is fixedly connected to the active shear plate (5), and the outer side is slidably fitted to the inner wall of the outer sleeve (1).

4. An inertial damper based on shear thickening liquid according to claim 1, characterized in that: The two ends of the sleeve (13) are rotatably connected to the first end cover (2) and the second end cover (3) via a first thrust bearing (11) and a second thrust bearing (10), respectively.

5. The inertial damper based on shear thickening liquid according to claim 1, characterized in that: The first driven shear plate (4) and the second driven shear plate (7) are both rotatably connected to the sleeve (13) via a rotating bearing (12).

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