Built-in annular channel MR-STF damper with dynamic recovery performance and working method

Abstract

The invention discloses a built-in annular channel MR-STF damper with dynamic recovery performance and a working method, and relates to the anti-seismic field of civil engineering constructions.The built-in annular channel MR-STF damper comprises a piston rod, a cylinder barrel and a main piston, the two ends of the cylinder barrel are sealed through a left cylinder cover and a right cylinder cover, and a bag type air cylinder is arranged at the position, close to the right cylinder cover, in the cylinder barrel; a floating piston is arranged on the left side of the bag type air cylinder. One end of the piston rod is provided with a main piston, and the other end extends out of the left cylinder cover; magnetorheological shear thickening fluid is arranged in the cylinder barrel. The piston outer assembly is sleeved outside the main piston, the outer diameter of the main piston is smaller than the inner diameter of the piston outer assembly, and the built-in annular channel is formed between the main piston and the piston outer assembly, so that the length of an effective damping channel of the damper is longer under the same size, the output of the damper is improved, and the damper is more suitable for the field of house buildings; and the influence of the earthquake on the house is effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of earthquake resistance of civil engineering buildings, and in particular to a built-in annular channel MR-STF damper with dynamic recovery performance and a working method. 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. my country's urbanization rate has reached 65.2%, 58% of the country's land area, more than 50% of cities, and 70% of large and medium-sized cities with a population of more than one million are located in high-intensity earthquake zones of 7 degrees or above. In order to reduce the impact of earthquakes on houses, research on a safer, more economical and reliable new structural seismic resistance system is of great practical significance for effectively reducing earthquake disasters and improving building resilience.

[0003] Magnetorheological fluid and Shear Thickening Fluid (MR-STF) material is a new type of smart material that combines the magnetic sensitivity of magnetorheological smart materials and the rate-sensitive properties of shear thickening materials. Magnetorheological fluid (MRF) shear thins at high shear rates, and its viscosity increases rapidly when a magnetic field is applied, and it has real-time adjustable properties; shear thickening fluid (STF) shear thins at low shear rates and has shear thickening properties at high shear rates. The combination of the two can make up for their respective shortcomings. The new smart material that combines the rate-sensitive properties of STF and the magnetic sensitivity of MRF materials can overcome the shear thinning phenomenon of STF at low shear rates and MRF at high shear rates.

[0004] Traditional magnetorheological dampers are mostly used in the field of mechanical or automotive vibration reduction, but magnetorheological dampers are not widely used in the field of house construction. The effective damping channel length of most existing dampers is relatively short. If the size of the damper is increased, the amount of MR-STF will increase, and the cost of the damper will increase. In addition, the damper is installed in the house to reduce the impact of earthquakes on the house. The magnetorheological damper will be stationary for a long time, and there is a density difference of several times between the magnetic particles and the base carrier fluid. After standing still, the MR-STF will tend to settle, resulting in a significant decrease in the controllability of the magnetorheological damper, affecting the shock absorption effect of the magnetorheological damper. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a built-in annular channel MR-STF damper with dynamic recovery performance and a working method. The present invention forms a built-in annular damping channel by socketing the main and auxiliary plugs with the piston outer component, so that the effective damping channel length of the damper is longer under the same size, the damper output is improved, and it is more suitable for the field of house construction; by arranging a rotating component on the piston rod, and arranging a stirring blade on the rotating component, when the damper is working, the MR-STF flow drives the rotating component to rotate, and the stirring blade stirs the magnetorheological shear thickening fluid, quickly recovering the MR-STF performance, so that it can quickly return to normal state.

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

[0007] A built-in annular channel MR-STF damper with dynamic recovery performance comprises a piston rod, a cylinder barrel and a main piston, wherein both ends of the cylinder barrel are sealed by a left cylinder head and a right cylinder head, and a bladder cylinder is arranged in the cylinder barrel near the right cylinder head, and a floating piston is arranged on the left side of the bladder cylinder; a main piston is arranged at one end of the piston rod, and the other end extends out of the left cylinder head; a magnetorheological shear thickening fluid is built in the cylinder barrel.

[0008] Preferably, a piston outer assembly is sleeved on the outer side of the main piston, and a secondary piston is arranged on the main piston near the right cylinder head side.

[0009] Preferably, an annular magnetic isolation body is arranged inside the piston outer component; excitation coils are arranged on both sides of the annular magnetic isolation body; and the excitation coils are arranged on the main piston.

[0010] Preferably, the outer diameter of the main piston is smaller than the inner diameter of the piston outer component, and an annular damping channel is formed between the piston outer component and the main piston.

[0011] Preferably, a groove is provided on the piston rod, a ball is arranged in the groove, a rotating shaft disk is arranged outside the ball, and a stirring blade is arranged on the rotating shaft disk.

[0012] Preferably, an excitation coil is provided on the secondary piston.

[0013] Preferably, a left lifting ear is connected to the piston rod.

[0014] Preferably, a right lifting ear is connected to the right cylinder head.

[0015] Preferably, under the action of external force, one end of the floating piston can compress the bladder cylinder.

[0016] The working method of the built-in annular channel MR-STF damper with dynamic recovery performance is that when the damper is subjected to external seismic load, the piston rod drives the main piston to squeeze the magnetorheological shear thickening fluid to the right, and the floating piston compresses the bladder cylinder to provide compensation volume; the magnetorheological shear thickening fluid flows through the annular damping channel, and provides a large damping force under the action of the magnetic field generated by the excitation coil, and at the same time drives the rotating component to rotate, and the stirring blade stirs the magnetorheological shear thickening fluid to quickly restore the MR-STF performance; when the displacement caused by the seismic load is large, the secondary piston squeezes the MR-STF to consume energy, and works in coordination with the main piston to adapt to different seismic excitation frequencies, thereby effectively reducing the impact of earthquakes on building structures.

[0017] Beneficial effects:

[0018] 1. Compared with the traditional magnetorheological damper, the main piston and the piston outer component are nested to form a built-in annular channel. The present invention forms a built-in annular channel between the main piston and the piston outer component by arranging the piston outer component on the main piston outer sleeve. The outer diameter of the main piston is smaller than the inner diameter of the piston outer component. The main piston and the piston outer component are nested to form a built-in annular channel, so that the effective damping channel length of the damper is longer under the same size, the damper output is improved, and it is more suitable for the field of house construction, effectively reducing the impact of earthquakes on houses.

[0019] 2. Compared with the traditional magnetorheological damper, the present invention has dynamic recovery performance. When the damper is left stationary for a long time, the MR-STF will tend to settle. When the damper is working, the MR-STF flow drives the rotating component to rotate, and the stirring blade stirs the magnetorheological shear thickening liquid, which effectively improves the problem of magnetic particle sedimentation, so that the MR-STF damper has dynamic recovery performance, quickly restores the performance of the magnetorheological fluid, and quickly returns to normal state.

[0020] 3. The present invention connects a secondary piston to the right side of the main piston. When the main piston is displaced too much in the MR-STF chamber, the secondary piston will also squeeze the MR-STF to consume energy. Compared with the traditional magnetorheological damper, the output is greater, which effectively improves the space utilization of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a built-in annular channel MR-STF damper with dynamic recovery performance;

[0022] Figure 2 for Figure 1 Schematic diagram of the piston outer components involved;

[0023] Figure 3 for Figure 1 Schematic diagram of the main piston involved;

[0024] Figure 4 for Figure 1Schematic diagram of the annular damping channel involved;

[0025] Figure 5 for Figure 1 Schematic diagram of the rotating components involved;

[0026] Figure 6 for Figure 1 Schematic diagram of the piston rod involved;

[0027] Figure 7 for Figure 1 Schematic diagram of the main piston magnetic circuit involved.

[0028] Figure 8 for Figure 1 Actual picture of the damper involved in the article.

[0029] Reference numerals:

[0030] 1-left lifting ear; 2-piston rod; 3-left cylinder head; 4-piston outer assembly; 5-annular magnetic isolation body; 6-excitation coil; 7-cylinder barrel; 8-first sealing ring; 9-right cylinder head; 10-connecting bolt; 11-rotating assembly; 12-second sealing ring; 13-main piston; 14-secondary piston; 15-MR-STF chamber; 16-floating piston; 17-bladder cylinder; 18-right lifting ear; 19-annular damping channel; 20-rotating shaft disk; 21-ball; 22-stirring blade; 23-groove. 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 accompanying 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 limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, 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 "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Combined with Figure 1-6As shown, a built-in annular channel MR-STF damper with dynamic recovery performance includes a left lifting ear 1, a piston rod 2, a left cylinder head 3, a piston outer component 4, an annular magnetic isolation body 5, an excitation coil 6, a cylinder barrel 7, a first sealing ring 8, a right cylinder head 9, a connecting bolt 10, a rotating component 11, a second sealing ring 12, a main piston 13, a secondary piston 14, an MR-STF chamber 15, a floating piston 16, a bladder cylinder 17, a right lifting ear 18, an annular damping channel 19, a rotating Axle disc 20, ball bearing 21, stirring blade 22 and groove 23; both ends of cylinder barrel 7 are sealed by left cylinder head 3 and right cylinder head 9, and a bladder cylinder 17 is arranged near right cylinder head 9 in cylinder barrel 7, and a floating piston 16 is arranged on the left side of bladder cylinder 17; the outer side of floating piston 16 is wrapped with a first sealing ring 8, and a MR-STF chamber 15 is arranged between floating piston 16 and left cylinder head 3; the MR-STF chamber 15 is filled with magnetorheological shear thickening fluid. One end of piston rod 2 extends out of left cylinder head and is connected with left lifting ear 1, and the other end is connected with main piston 13; piston outer assembly 4 is arranged on the outer sleeve of main piston 13, the outer diameter of main piston 13 is smaller than the inner diameter of piston outer assembly 4, and an annular damping channel 19 is formed in the middle; the right side of main piston 13 is connected with auxiliary piston 14, and an excitation coil is wound on auxiliary piston 14; the piston rod 2 is connected with left lifting ear 1; the right cylinder head 9 is connected with right lifting ear 18.

[0035] Combined with Figure 2 , 3 As shown in Figure 4, a piston outer component 4 is disposed outside the main piston 13. The outer diameter of the main piston 13 is smaller than the inner diameter of the piston outer component 4, and an annular damping channel 19 is formed in the middle, which increases the effective channel length of the magnetorheological damper and the utilization rate of the magnetic field, provides a greater output damping force, and effectively reduces the impact of earthquakes on houses.

[0036] Combined with Figure 5 and 6 As shown, the piston rod 2 is provided with a groove 23, and the rotating shaft disc 20 and the ball 21 are embedded in the groove 23 of the piston rod, and are connected with the piston rod 2 to form a rotatable rotating assembly 11; the rotating assembly 11 is provided with a stirring blade 22, and the stirring blade 22 can rotate with the rotating assembly 11. When the damper is subjected to an external load and the piston rod 2 moves to the left or right, the MR-STF will flow along the annular damping channel 19, which will drive the rotating assembly 11 to rotate, and the stirring blade 22 will stir the magnetorheological shear thickening liquid, effectively improving the problem of magnetic particle sedimentation and making it quickly return to normal state.

[0037] The working method of the built-in annular channel MR-STF damper with dynamic recovery performance is as follows: when the damper is subjected to an external seismic load, the piston rod 2 drives the main piston 13 to squeeze the magnetorheological shear thickening liquid to the right, and the floating piston 16 compresses the bladder cylinder 17 to provide a compensation volume; the magnetorheological shear thickening liquid flows through the annular damping channel 19, and provides a large damping force under the action of the magnetic field generated by the excitation coil 6, and at the same time drives the rotating component 11 to rotate, and the stirring blade 22 stirs the magnetorheological shear thickening liquid to quickly restore the MR-STF performance; when the displacement caused by the seismic load is large, the secondary piston 14 squeezes the MR-STF to consume energy, and works in coordination with the main piston 13, thereby adapting to different seismic excitation frequencies and effectively reducing the impact of earthquakes on building construction.

[0038] 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.

[0039] 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 built-in annular channel MR-STF damper with dynamic recovery performance, characterized in that: The invention comprises a piston rod (2), a cylinder barrel (2) and a main piston (13); the two ends of the cylinder barrel (2) are sealed by a left cylinder cover (3) and a right cylinder cover (9); a bladder cylinder (17) is arranged in the cylinder barrel (7) near the right cylinder cover (9); a floating piston (16) is arranged on the left side of the bladder cylinder (17); the main piston (13) is arranged at one end of the piston rod (2), and the other end extends out of the left cylinder cover (3); and a magnetorheological shear thickening fluid is built in the cylinder barrel (2).

2. The built-in annular channel MR-STF damper with dynamic recovery performance according to claim 1, characterized in that: The outer side of the main piston (13) is covered with a piston outer assembly (4), and a secondary piston (14) is arranged on the main piston (13) near the right cylinder cover (9).

3. The built-in annular channel MR-STF damper with dynamic recovery performance according to claim 2, characterized in that: An annular magnetic isolating body (5) is arranged inside the piston outer component (4); excitation coils (6) are arranged on both sides of the annular magnetic isolating body (5); and the excitation coils (6) are arranged on the main piston (13).

4. The built-in annular channel MR-STF damper with dynamic recovery performance according to claim 1, characterized in that: The outer diameter of the main piston (7) is smaller than the inner diameter of the piston outer component (4), and an annular damping channel (19) is formed between the piston outer component (4) and the main piston (13).

5. The built-in annular channel MR-STF damper with dynamic recovery performance according to claim 1, characterized in that: The piston rod (2) is provided with a groove (23), a ball (21) is arranged in the groove (23), a rotating shaft disk (20) is arranged outside the ball (21), and a stirring blade (22) is arranged on the rotating shaft disk (20).

6. The built-in annular channel MR-STF damper with dynamic recovery performance according to claim 1, characterized in that: An excitation coil (6) is arranged on the secondary piston (14).

7. The built-in annular channel MR-STF damper with dynamic recovery performance according to claim 1, characterized in that: The piston rod (2) is connected with a left lifting ear (1).

8. The built-in annular channel MR-STF damper with dynamic recovery performance according to claim 1, characterized in that: The right cylinder cover (9) is connected with a right lifting lug (17).

9. The built-in annular channel MR-STF damper with dynamic recovery performance according to claim 1, characterized in that: Under the action of external force, one end of the floating piston (16) can compress the bag-type cylinder (17).

10. The working method of the built-in annular channel MR-STF damper with dynamic recovery performance according to any one of claims 1 to 9, characterized in that: When the damper is subjected to an external earthquake load, the piston rod (2) drives the main piston (13) to squeeze the magnetorheological shear thickening fluid to the right, and the floating piston (16) compresses the capsule cylinder (17) to provide a compensation volume; the magnetorheological shear thickening fluid flows through the annular damping channel (19), and provides a large damping force under the action of the magnetic field generated by the excitation coil (6), and at the same time drives the rotating component (11) to rotate, and the stirring blade (22) stirs the magnetorheological shear thickening fluid to quickly restore the MR-STF performance; when the displacement caused by the earthquake load is large, the secondary piston (14) squeezes the MR-STF to consume energy, and works in coordination with the main piston (13), thereby adapting to different earthquake excitation frequencies and effectively reducing the impact of earthquakes on building structures.

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