Double-layer cylinder barrel inner sleeve type MR-STF damper and working method thereof

Abstract

The invention discloses a double-layer cylinder barrel inner sleeve type MR-STF damper and a working method, and relates to the field of building seismic resistance. The space between an inner cylinder barrel and an outer cylinder barrel is filled with magnetorheological shear thickening fluid; the two ends of the outer cylinder barrel are sealed through outer cylinder covers, and inner cylinder covers are arranged at the two ends of the inner cylinder barrel. The piston rod penetrates through the inner cylinder cover and extends out of the outer cylinder cover; a hole type liquid flow channel is formed in the inner cylinder cover, and a gap between the outer side wall of the inner cylinder barrel and the inner side wall of the outer cylinder barrel is an annular damping channel. When the damper works, a piston extrudes MR-STF to an annular damping channel between the inner cylinder barrel and the outer cylinder barrel from a cavity on one side through a hole type liquid flow channel formed in the inner cylinder cover, and liquid in the liquid flow channel on the inner cylinder cover generates a shear thickening effect; the magnetorheological effect and the shear thickening effect of the liquid occur at the position of the annular damping channel, the length of the damping channel is effectively increased, it is guaranteed that large damping force is output, and the sedimentation problem is effectively solved through circulating flowing of the liquid.

Description

Technical Field

[0001] The invention relates to the field of earthquake resistance of buildings and civil engineering, and in particular to a double-layer cylinder sleeve type MR-STF damper and a working method thereof. Background Art

[0002] my country is located in the world's two major seismic belts, the Eurasian seismic belt and the Pacific Rim seismic belt. The new damper suitable for civil engineering structure seismic resistance is of great significance for reducing the damage of earthquakes to building structures.

[0003] With the continuous development and progress of science and technology, more and more shock-absorbing devices and shock-absorbing materials have come out one after another, and magnetorheological shear thickening fluid is a new type of intelligent material that combines the magnetorheological effect and the shear thickening effect. Magnetorheological fluid is a fluid whose rheological properties (such as viscosity and yield stress) will change significantly under the action of an external magnetic field. Shear thickening fluid is a fluid whose viscosity increases sharply when subjected to shear force. Combining the magnetorheological effect with the shear thickening effect can develop a new type of material with more complex and controllable rheological properties - magnetorheological shear thickening fluid (MR-STF). This material can not only adjust its rheological properties under the action of an external magnetic field, but also exhibit a unique thickening effect when subjected to shear force.

[0004] With the deepening of research, intelligent composite materials have been successfully applied to structural shock-absorbing devices, which have the characteristics of large output, low energy consumption and rapid response. Therefore, based on new intelligent materials, research on safer, more economical and reliable new structural earthquake-resistant systems has important practical significance for effectively reducing earthquake disasters and improving building resilience. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a double-layer cylinder inner sleeve type MR-STF damper and a working method. The present invention arranges the inner cylinder and the outer cylinder into an inner sleeve type so that the damper has a double-layer cylinder wall, and an annular damping channel exists between the cylinders. When the piston rod is pushed, the piston squeezes the magnetorheological shear thickening fluid in the inner cylinder from the MR-STF chamber in the inner cylinder into the outer annular damping channel, so that the flow stroke of the MR-STF becomes longer, the effective damping channel length increases, and the output damping force is greater.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] A double-layer cylinder sleeve type MR-STF damper comprises an inner cylinder, an outer cylinder and a piston rod, wherein the inner cylinder is arranged in the outer cylinder, and a magnetorheological shear thickening fluid is filled between the inner cylinder and the outer cylinder; both ends of the outer cylinder are sealed by an outer cylinder cover, and inner cylinder covers are arranged at both ends of the inner cylinder; the piston rod passes through the inner cylinder cover and extends out of the outer cylinder cover, and a piston is arranged on the piston rod; a porous liquid flow channel is opened on the inner cylinder cover, and the gap between the outer side wall of the inner cylinder and the inner side wall of the outer cylinder is an annular damping channel.

[0008] In the above solution, a plurality of porous liquid flow channels are evenly distributed along the circumferential direction on the inner cylinder cover.

[0009] In the above solution, a groove is provided on the outer side wall of the inner cylinder cover, and an excitation coil is arranged in the groove.

[0010] In the above solution, the inner cylinder cover and the inner cylinder barrel are connected via a threaded connection end; and the two ends of the piston rod are respectively provided with a left lifting ear and a right lifting ear.

[0011] In the above solution, the outer ring of the piston is provided with an annular sealing ring, which is used to seal the gap between the piston and the inner cylinder.

[0012] In the above scheme, the inner chamber of the inner cylinder is a MR-STF chamber, the MR-STF chamber is filled with magnetorheological shear thickening fluid, and the piston divides the MR-STF chamber into two parts.

[0013] In the above solution, the inner cylinder cover can slide relative to the piston rod, and the piston rod drives the piston to move.

[0014] The working method of the double-layer cylinder sleeve type MR-STF damper includes the following steps:

[0015] When the double-layer cylinder sleeve MR-STF damper is subjected to external load, the piston rod will move according to the load, and during the movement, the piston will drive the piston to squeeze the magnetorheological shear thickening fluid in the MR-STF chamber through the porous liquid flow channel on the inner cylinder cover, enter the annular damping channel, and reach the other side of the MR-STF chamber; the magnetorheological shear thickening fluid will undergo shear thickening effect in the porous liquid flow channel, and magnetorheological effect and shear thickening effect will occur in the annular damping channel, so that It is found that the double-layer cylinder inner sleeve MR-STF damper has a porous liquid flow channel and an annular damping channel in the working process, which increases the output damping force; the piston divides the MR-STF chamber into two parts, and the magnetorheological shear thickening fluid flows from the porous liquid flow channel through the annular damping channel, and then flows back to the MR-STF chamber from the other side. In this process, the magnetorheological shear thickening fluid circulates in the double-layer cylinder inner sleeve MR-STF damper, which can effectively improve the sedimentation problem of liquid particles.

[0016] In the above scheme, when the installation space of the double-layer cylinder inner sleeve type MR-STF damper is limited due to the influence of the external environment, two excitation coils are wound around the outside of the inner cylinder, and an excitation coil is also wound around the inner cylinder head. The piston is placed inside the inner cylinder, so that the stroke of the double-layer cylinder inner sleeve type MR-STF damper is not reduced due to the increase in piston size caused by the increase in excitation coils, thereby improving the shock absorption and buffering effect.

[0017] Beneficial effects:

[0018] 1. The present invention forms an annular damping channel between the inner cylinder and the outer cylinder by arranging an inner sleeve combination of the inner cylinder and the outer cylinder. When the damper is working, both magnetorheological effect and shear thickening effect occur when the liquid flows through the annular damping channel, so that the effective damping channel of the MR-STF damper is increased and a greater damping force can be output.

[0019] 2. The inner cylinder head of the present invention is provided with a porous liquid flow channel. The piston squeezes MR-STF to flow from the MR-STF chamber on one side through the liquid flow channel of the inner cylinder head and through the annular damping channel to reach the MR-STF chamber on the other side. When MR-STF passes through the porous liquid flow channel of the inner cylinder head, the liquid will produce a shear thickening effect and generate corresponding damping force.

[0020] 3. If the traditional magnetorheological damper needs to increase the excitation coil, the size of the piston head needs to be increased, resulting in a reduced stroke of the piston in the cylinder. The present invention winds multiple excitation coils around the outside of the inner cylinder and the inner cylinder cover, and places the piston head inside the inner cylinder, so that the stroke of the damper is larger than that of the traditional magnetorheological damper of the same size.

[0021] 4. After the damper has been stationary for a long time, the MR-STF inside will tend to settle. The piston of the present invention divides the MR-STF chamber in the inner cylinder into two parts, left and right. When the damper is working, the MR-STF will circulate in the left and right areas of the chamber through the liquid flow channel on the inner cylinder cover and the external annular damping channel, effectively improving the problem of magnetic particle sedimentation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a double-layer cylinder sleeve type MR-STF damper involved in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the piston rod involved;

[0024] Figure 3 for Figure 1 Schematic diagram of the inner cylinder involved;

[0025] Figure 4 for Figure 1 Schematic diagram of the cooperation between the inner cylinder barrel and the inner cylinder head involved in the invention;

[0026] Figure 5 for Figure 1 Schematic diagram of the cross section of the inner cylinder head involved;

[0027] Figure 6 for Figure 1 Overall cross-sectional diagram;

[0028] Figure 7 for Figure 1 Schematic diagram of the magnetic circuit of the intermediate excitation coil.

[0029] Reference numerals:

[0030] 1-left lifting ear; 2-piston rod; 3-inner cylinder cover; 4-threaded connection end; 5-excitation coil; 6-piston; 7-MR-STF chamber; 8-outer cylinder cover; 9-porous liquid flow channel; 10-inner cylinder; 11-annular sealing ring; 12-annular damping channel; 13-outer cylinder; 14-connecting bolt; 15-right lifting ear. DETAILED DESCRIPTION

[0031] 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.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships 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. In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] Combined with Figure 1 and 2As shown, a double-layer cylinder sleeve type MR-STF damper includes a left lifting ear 1, a piston rod 2, an inner cylinder cover 3, an inner cylinder 10, an excitation coil 5, an annular sealing ring 11, an MR-STF chamber 7, a porous liquid flow channel 9, a piston 6, an outer cylinder 13, an outer cylinder cover 8, a connecting bolt 14 and a right lifting ear 15; the inner cylinder 10 and the inner cylinder cover 3 are spirally connected through a threaded connection end 4, and the inner cylinder cover 3 is provided with a porous liquid flow channel 9; the outer cylinder cover 8 is sealed with the inner cylinder cover 3; the left and right ends of the piston rod 2 are respectively The outer cylinder covers 8 extend from the left and right ends and are connected to the left lifting ear 1 and the right lifting ear 15 respectively; the piston rod 2 is connected to the piston head 6 and is placed in the MR-STF chamber 7 in the inner cylinder 10; an annular sealing ring 11 is provided on the piston head 6; the MR-STF chamber 7 is filled with magnetorheological shear thickening fluid; two excitation coils 5 are wound around the outside of the inner cylinder 10 at equal distances; the excitation coil 5 is provided on the outside of the inner cylinder cover 3; the outer cylinder 8 is connected to the left and right outer cylinder covers 8 by connecting bolts 14, and a seal is provided at the connecting end.

[0034] Working process: When the double-layer cylinder sleeve type MR-STF damper is subjected to external loads such as earthquakes, the piston rod 2 will move in response to the earthquake load. During the movement, the piston 6 will squeeze the magnetorheological shear thickening fluid in the MR-STF chamber 7 through the porous liquid flow channel 9 on the inner cylinder cover 3, enter the annular damping channel 12, and reach the other side of the MR-STF chamber 7; the magnetorheological shear thickening fluid undergoes shear thickening effect in the porous liquid flow channel 9, and magnetostriction occurs in the annular damping channel 12. Due to the rheological effect and shear thickening effect, the double-layer cylinder sleeve MR-STF damper has a porous liquid flow channel 9 and an annular damping channel 12 during the working process, which increases the output damping force; the piston 6 divides the MR-STF chamber 7 into two parts, and the magnetorheological shear thickening liquid flows from the porous liquid flow channel 9 through the annular damping channel 12, and then flows back to the MR-STF chamber 7 from the other side. During this process, the magnetorheological shear thickening liquid circulates in the damper, effectively improving the sedimentation problem of liquid particles.

[0035] When the installation space of the double-layer cylinder sleeve type MR-STF damper is limited due to the influence of the external environment, two excitation coils 5 are wound around the outside of the inner cylinder 10, and an excitation coil 7 is also wound around the inner cylinder head 3. The piston 6 is placed inside the inner cylinder 10, so that the stroke of the damper is not reduced due to the increase in the size of the piston head caused by the increase in the excitation coils, and the shock absorbing effect is more obvious.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0037] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A double-layer cylinder inner sleeve type MR-STF damper, comprising an inner cylinder (10), an outer cylinder (13) and a piston rod (2), characterized in that: The inner cylinder (10) is arranged in the outer cylinder (13), and the space between the inner cylinder (10) and the outer cylinder (13) is filled with magnetorheological shear thickening fluid; the two ends of the outer cylinder (13) are sealed by an outer cylinder cover (8), and the two ends of the inner cylinder (10) are provided with inner cylinder covers (3); the piston rod (2) passes through the inner cylinder cover (3) and extends out of the outer cylinder cover (8), and the piston rod (2) is provided with a piston (6); the inner cylinder cover (3) is provided with a pore-type liquid flow channel (9), and the gap between the outer wall of the inner cylinder (10) and the inner wall of the outer cylinder (13) is an annular damping channel (12).

2. The double-layer cylinder sleeve type MR-STF damper according to claim 1 is characterized in that: The inner cylinder cover (3) is provided with a plurality of pore-type liquid flow channels (9) evenly distributed along the circumferential direction.

3. The double-layer cylinder sleeve type MR-STF damper according to claim 1 is characterized in that: A groove is provided on the outer wall of the inner cylinder cover (3), and an excitation coil (5) is arranged in the groove.

4. The double-layer cylinder sleeve type MR-STF damper according to claim 1 is characterized in that: The inner cylinder cover (3) and the inner cylinder barrel (10) are connected via a threaded connection end (4); and the two ends of the piston rod (2) are respectively provided with a left lifting ear (1) and a right lifting ear (15).

5. The double-layer cylinder sleeve type MR-STF damper according to claim 1 is characterized in that: The outer ring of the piston (6) is provided with an annular sealing ring (11), and the annular sealing ring (11) is used to seal the gap between the piston (6) and the inner cylinder (10).

6. The double-layer cylinder sleeve type MR-STF damper according to claim 1 is characterized in that: The inner chamber of the inner cylinder (10) is a MR-STF chamber (7), the MR-STF chamber (7) is filled with magnetorheological shear thickening fluid, and the piston (6) divides the MR-STF chamber (7) into two parts.

7. The double-layer cylinder sleeve type MR-STF damper according to claim 1 is characterized in that: The inner cylinder cover (3) can slide relative to the piston rod (2), and the piston rod (2) drives the piston (6) to move.

8. The working method of the double-layer cylinder sleeve type MR-STF damper according to any one of claims 1 to 7, characterized in that: The steps include: When the double-layer cylinder sleeve type MR-STF damper is subjected to an external load, the piston rod (2) will move in response to the load, and during the movement, the piston (6) will be driven to squeeze the magnetorheological shear thickening fluid in the MR-STF chamber (7) through the porous liquid flow channel (9) on the inner cylinder cover (3), enter the annular damping channel (12), and reach the other side of the MR-STF chamber (7); the magnetorheological shear thickening fluid will experience a shear thickening effect in the porous liquid flow channel (9), and a magnetorheological effect and a shear thickening effect will occur in the annular damping channel (12). The double-layer cylinder sleeve type MR-STF damper has a porous liquid flow channel (9) and an annular damping channel (12) during operation, thereby increasing the output damping force; the piston (6) divides the MR-STF chamber (7) into two parts, and the magnetorheological shear thickening liquid flows from the porous liquid flow channel (9) through the annular damping channel (12) and then flows back to the MR-STF chamber (7) from the other side. In this process, the magnetorheological shear thickening liquid circulates in the double-layer cylinder sleeve type MR-STF damper, which can effectively improve the sedimentation problem of liquid particles.

9. The working method according to claim 8, characterized in that: When the installation space of the double-layer cylinder sleeve type MR-STF damper is limited due to the influence of the external environment, two excitation coils (5) are wound around the outside of the inner cylinder (10), and an excitation coil (7) is also wound around the inner cylinder cover (3). The piston (6) is placed inside the inner cylinder (10), so that the stroke of the double-layer cylinder sleeve type MR-STF damper is not reduced due to the increase in the size of the piston (6) caused by the increase in the number of excitation coils (5), thereby improving the shock absorption and buffering effect.

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