A new type of SMA annular spring damper

Abstract

The present invention is a novel SMA annular spring damper, comprising an outer cavity shell, closed end plates are arranged at both ends of the outer cavity shell, a slide bar is fixed between the two closed end plates, an outer slide tube is fixed on the inner side surface of the closed end plate, an inner slide tube is mounted on the slide bar, the outer wall diameter of the inner slide tube is not greater than the inner wall diameter of the outer slide tube, two chucks are fixed on the outer wall of the inner slide tube, an annular spring is fixed between the inner side surface of the closed end plate and the corresponding chucks, an inner end plate is fixed on the outer wall of the inner slide tube between the two chucks, SMA annular spring groups are arranged between the two sides of the inner end plate and the chucks, an inner cavity shell is fixed on one side of the inner end plate, one end face of the inner cavity shell passes through the closed end plate and is connected to the outer end plate. The present invention effectively reduces the loss of shape memory alloy when the damper is deformed by small displacement, gives full play to the hysteresis energy dissipation ability and pressure bearing capacity of the shape memory alloy when the damper is deformed by large displacement, has the ability of self-reset, the device is stable and reliable, and can give full play to the self-locking effect when the displacement is too large.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction dampers, and in particular to a novel SMA annular spring damper. Background Art

[0002] Annular spring is a widely used buffering and energy-absorbing component in the industrial field. In the past, it was mainly used for buffering and vibration reduction devices of heavy machinery and equipment. In recent years, annular springs have begun to be introduced into the field of passive energy dissipation and shock absorption of building structures. Compared with ordinary steel, shape memory alloy (SMA) has better corrosion resistance and fatigue resistance, and due to the shape memory effect and superelastic effect in mechanical properties, it has the ability to self-reset while hysteresis energy dissipation, so it is often used in passive control of structures. By introducing shape memory alloy (SMA) into annular spring, the hysteresis energy dissipation ability of shape memory alloy (SMA) can be well exerted, but the service life of shape memory alloy (SMA) is not long. After long-term use, the shape memory alloy SMA itself will creep, making it unable to work stably. Summary of the invention

[0003] The present invention aims to solve the deficiencies of the prior art and provides a novel SMA annular spring damper.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A novel SMA annular spring damper comprises an outer cavity shell, closed end plates are arranged at both ends of the outer cavity shell, a sliding rod is fixed between the two closed end plates along the central axis direction of the outer cavity shell, an outer sliding cylinder coaxial with the sliding rod is fixed on the inner side surface of the closed end plate, an inner sliding cylinder is sleeved on the sliding rod, the outer wall diameter of the inner sliding cylinder is not larger than the inner wall diameter of the outer sliding cylinder, two chucks are fixed on the outer wall of the inner sliding cylinder, an annular spring is fixed between the inner side surface of the closed end plate and the corresponding chucks, the annular spring is sleeved outside the inner sliding cylinder and the outer sliding cylinder, an inner end plate is fixed on the outer wall of the inner sliding cylinder between the two chucks, SMA annular spring groups are arranged on both sides of the inner end plate and between the chucks, an inner cavity shell is fixed on one side of the inner end plate, and one end surface of the inner cavity shell passes through the closed end plate and is connected to the outer end plate.

[0006] The SMA annular spring assembly includes a plurality of SMA annular spring monomers connected in series. The SMA annular spring monomer includes an SMA inner ring. Washers are arranged on both sides of the SMA inner ring. An SMA outer ring is arranged outside the SMA inner ring. The outer end surface of the washer is exposed to the outer end surface of the SMA outer ring.

[0007] The gasket is a truncated cone structure with a narrow inner side and a wide outer side, and the inner wall of the SMA outer ring matches the side wall of the gasket.

[0008] A connecting rod is arranged on the outer side surface of the closed end plate opposite to the outer end plate.

[0009] An actuating rod is arranged on the outer side surface of the outer end plate.

[0010] The beneficial effects of the present invention are as follows: the present invention effectively reduces the loss of shape memory alloy when the damper is deformed with a small displacement, fully utilizes the hysteresis energy dissipation ability of the shape memory alloy when the damper is deformed with a large displacement, has the ability of self-resetting, fully utilizes the good pressure-bearing capacity of the shape memory alloy, and the device is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention;

[0012] Figure 2 A perspective view of the present invention;

[0013] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0014] Figure 4 It is a schematic diagram of the SMA annular spring assembly in the present invention;

[0015] Figure 5 It is a schematic diagram of the annular spring in the present invention when it is deformed;

[0016] Figure 6 It is a schematic diagram of the annular spring in the present invention when the SMA annular spring group on one side is also deformed after the annular spring is deformed;

[0017] In the figure: 1-outer cavity shell; 2-closed end plate; 3-sliding rod; 4-outer sliding cylinder; 5-inner sliding cylinder; 6-chuck; 7-annular spring; 8-inner end plate; 9-SMA annular spring assembly; 10-inner cavity shell; 11-outer end plate; 12-connecting rod; 13-actuating rod;

[0018] 901-SMA inner ring; 902-washer; 903-SMA outer ring;

[0019] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0021] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0024] A new type of SMA annular spring damper, such as Figures 1 to 3 As shown, it includes an outer cavity shell 1, a closed end plate 2, a sliding rod 3, an outer sliding cylinder 4, an inner sliding cylinder 5, a chuck 6, an annular spring 7, an inner end plate 8, an SMA annular spring group 9, an inner cavity shell 10, an outer end plate 11, a connecting rod 12 and an actuating rod 13.

[0025] Closed end plates 2 are provided at both ends of the outer cavity shell 1, and a slide rod 3 is fixed between the two closed end plates 2 along the central axis direction of the outer cavity shell 1, an outer slide cylinder 4 coaxial with the slide rod 3 is fixed on the inner side surface of the closed end plate 2, an inner slide cylinder 5 is sleeved on the slide rod 3, the outer wall diameter of the inner slide cylinder 5 is not larger than the inner wall diameter of the outer slide cylinder 4, two chucks 6 are fixed on the outer wall of the inner slide cylinder 5, an annular spring 7 is fixed between the inner side surface of the closed end plate 2 and the corresponding chuck 6, the annular spring 7 is sleeved on the outside of the inner slide cylinder 5 and the outer slide cylinder 4, an inner end plate 8 is fixed on the outer wall of the inner slide cylinder 5 between the two chucks 6, SMA annular spring groups 9 are provided between the two sides of the inner end plate 8 and the chucks 6, an inner cavity shell 10 is fixed on one side of the inner end plate 8, and one end face of the inner cavity shell 10 passes through the outside of the closed end plate 2 and is connected to the outer end plate 11.

[0026] like Figure 4 As shown, the SMA annular spring assembly 9 includes a plurality of SMA annular spring monomers connected in series, wherein the SMA annular spring monomer includes an SMA inner ring 901 , washers 902 are arranged on both sides of the SMA inner ring 901 , an SMA outer ring 903 is arranged outside the SMA inner ring 901 , and the outer end surface of the washer 902 exposes the outer end surface of the SMA outer ring 903 .

[0027] The washer 902 is a truncated cone structure that is narrow inside and wide outside, and the inner wall of the SMA outer ring 903 matches the side wall of the washer 902 .

[0028] The washer 902 is made of common alloy steel, and the SMA inner ring 901 and the SMA outer ring 903 are made of shape memory alloy (SMA).

[0029] The inner cavity shell 10 includes a plurality of arc-shaped inner shell plates evenly distributed around the circumference. The arc-shaped inner shell plates are fixed between the inner end plate 8 and the outer end plate 11 , and the arc-shaped inner shell plates are slidably arranged on the corresponding closed end plate 2 .

[0030] A connecting rod 12 is provided on the outer side surface of the closed end plate 2 opposite to the outer end plate 11 .

[0031] An actuating rod 13 is provided on the outer side surface of the outer end plate 11 .

[0032] The plane where the connecting rod 12 is located and the plane where the actuating rod 13 is located are arranged vertically.

[0033] The inner cavity shell 10 and the SMA annular spring assembly 9 can slide together with the inner slide cylinder 5 . When the damper is displaced, the inner cavity shell 10 and the SMA annular spring assembly 9 can drive the inner slide cylinder 5 to slide along the slide rod 3 .

[0034] like Figure 5 As shown, when the inner cavity shell 10 slides along the slide rod 3 with a certain displacement, the outer slide cylinder 4 can clamp the chuck 6 and thus restrict the inner slide cylinder 5 from sliding further. Figure 6 As shown, when the inner cavity shell 10 further displaces and slides along the slide rod 3, the outer slide cylinder 4 and the SMA annular spring assembly 9 can limit the inner cavity shell 10 from sliding further, and the damper is self-locking.

[0035] The annular spring 7 and the SMA annular spring group 9 can provide damping for the reciprocating motion of the inner cavity shell 10 along the axial direction of the slide rod 3. When the damper is displaced, when the annular spring 7 is deformed to a certain extent, the SMA annular spring group 9 further exerts a damping effect.

[0036] The SMA annular spring assembly 9 plays a hysteresis energy dissipation role through the extrusion deformation of the SMA inner ring 901 and the expansion of the SMA outer ring 903 .

[0037] The annular spring 7 and the SMA annular spring assembly 9 enable the damper to have the ability of self-resetting.

[0038] When the displacement deformation of the damper is small, the annular spring 7 mainly provides stiffness damping. As the displacement deformation of the damper gradually increases, the outer slide 4 and the chuck 6 limit the further deformation of the annular spring 7, and the SMA annular spring group 9 begins to play a role in providing stiffness damping, which effectively reduces the loss of shape memory alloy (SMA) when the damper has a small displacement deformation, and gives full play to the hysteresis energy dissipation ability of the shape memory alloy (SMA) when the damper has a large displacement deformation; at the same time, the damper has the ability of self-reset, and the damper gives full play to the good pressure-bearing capacity of the SMA annular spring group 9; the parts of the device are mostly in the form of annular, circular, etc., which are stable and reliable.

[0039] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A novel SMA annular spring damper, characterized in that: The invention comprises an outer cavity shell (1), wherein closed end plates (2) are provided at both ends of the outer cavity shell (1), a slide bar (3) is fixed between the two closed end plates (2) along the central axis direction of the outer cavity shell (1), an outer slide cylinder (4) coaxial with the slide cylinder (3) is fixed on the inner side surface of the closed end plate (2), an inner slide cylinder (5) is sleeved on the slide cylinder (3), the outer wall diameter of the inner slide cylinder (5) is not greater than the inner wall diameter of the outer slide cylinder (4), two chucks (6) are fixed on the outer wall of the inner slide cylinder (5), and the inner wall of the closed end plate (2) is provided with a plurality of chucks (6). An annular spring (7) is fixed between the side surface and the corresponding chuck (6), and the annular spring (7) is sleeved outside the inner slide cylinder (5) and the outer slide cylinder (4). An inner end plate (8) is fixed on the outer wall of the inner slide cylinder (5) between the two chucks (6), and SMA annular spring groups (9) are provided between the two sides of the inner end plate (8) and the chucks (6). An inner cavity shell (10) is fixed to one side of the inner end plate (8), and one end surface of the inner cavity shell (10) passes through the outside of the closed end plate (2) and is connected to the outer end plate (11); The SMA annular spring assembly (9) comprises a plurality of SMA annular spring monomers connected in series, wherein the SMA annular spring monomers comprise an SMA inner ring (901), washers (902) are provided on both sides of the SMA inner ring (901), an SMA outer ring (903) is provided outside the SMA inner ring (901), and an outer end surface of the washer (902) is exposed to an outer end surface of the SMA outer ring (903); the washer (902) is a truncated cone structure with a narrow inner side and a wide outer side, and an inner wall of the SMA outer ring (903) matches a side wall of the washer (902).

2. A novel SMA annular spring damper according to claim 1, characterized in that: The inner cavity shell (10) comprises a plurality of arc-shaped inner shell plates evenly distributed around the circumference, the arc-shaped inner shell plates being fixed between the inner end plate (8) and the outer end plate (11), and the arc-shaped inner shell plates being slidably disposed on the corresponding closed end plates (2).

3. A novel SMA annular spring damper according to claim 2, characterized in that: A connecting rod (12) is provided on the outer side surface of the closed end plate (2) opposite to the outer end plate (11).

4. A novel SMA annular spring damper according to claim 3, characterized in that: An actuating rod (13) is provided on the outer side surface of the outer end plate (11).

5. A novel SMA annular spring damper according to claim 4, characterized in that: The plane where the connecting rod (12) is located and the plane where the actuating rod (13) is located are arranged vertically.

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